20 files changed, 8770 insertions, 8770 deletions

diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/COPYING b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/COPYING
index c2d382b..a3e9774 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/COPYING
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/COPYING
@@ -1,340 +1,340 @@
-                    GNU GENERAL PUBLIC LICENSE

-                       Version 2, June 1991

-

- Copyright (C) 1989, 1991 Free Software Foundation, Inc.

-     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

- Everyone is permitted to copy and distribute verbatim copies

- of this license document, but changing it is not allowed.

-

-                            Preamble

-

-  The licenses for most software are designed to take away your

-freedom to share and change it.  By contrast, the GNU General Public

-License is intended to guarantee your freedom to share and change free

-software--to make sure the software is free for all its users.  This

-General Public License applies to most of the Free Software

-Foundation's software and to any other program whose authors commit to

-using it.  (Some other Free Software Foundation software is covered by

-the GNU Library General Public License instead.)  You can apply it to

-your programs, too.

-

-  When we speak of free software, we are referring to freedom, not

-price.  Our General Public Licenses are designed to make sure that you

-have the freedom to distribute copies of free software (and charge for

-this service if you wish), that you receive source code or can get it

-if you want it, that you can change the software or use pieces of it

-in new free programs; and that you know you can do these things.

-

-  To protect your rights, we need to make restrictions that forbid

-anyone to deny you these rights or to ask you to surrender the rights.

-These restrictions translate to certain responsibilities for you if you

-distribute copies of the software, or if you modify it.

-

-  For example, if you distribute copies of such a program, whether

-gratis or for a fee, you must give the recipients all the rights that

-you have.  You must make sure that they, too, receive or can get the

-source code.  And you must show them these terms so they know their

-rights.

-

-  We protect your rights with two steps: (1) copyright the software, and

-(2) offer you this license which gives you legal permission to copy,

-distribute and/or modify the software.

-

-  Also, for each author's protection and ours, we want to make certain

-that everyone understands that there is no warranty for this free

-software.  If the software is modified by someone else and passed on, we

-want its recipients to know that what they have is not the original, so

-that any problems introduced by others will not reflect on the original

-authors' reputations.

-

-  Finally, any free program is threatened constantly by software

-patents.  We wish to avoid the danger that redistributors of a free

-program will individually obtain patent licenses, in effect making the

-program proprietary.  To prevent this, we have made it clear that any

-patent must be licensed for everyone's free use or not licensed at all.

-

-  The precise terms and conditions for copying, distribution and

-modification follow.

-

-                    GNU GENERAL PUBLIC LICENSE

-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION

-

-  0. This License applies to any program or other work which contains

-a notice placed by the copyright holder saying it may be distributed

-under the terms of this General Public License.  The "Program", below,

-refers to any such program or work, and a "work based on the Program"

-means either the Program or any derivative work under copyright law:

-that is to say, a work containing the Program or a portion of it,

-either verbatim or with modifications and/or translated into another

-language.  (Hereinafter, translation is included without limitation in

-the term "modification".)  Each licensee is addressed as "you".

-

-Activities other than copying, distribution and modification are not

-covered by this License; they are outside its scope.  The act of

-running the Program is not restricted, and the output from the Program

-is covered only if its contents constitute a work based on the

-Program (independent of having been made by running the Program).

-Whether that is true depends on what the Program does.

-

-  1. You may copy and distribute verbatim copies of the Program's

-source code as you receive it, in any medium, provided that you

-conspicuously and appropriately publish on each copy an appropriate

-copyright notice and disclaimer of warranty; keep intact all the

-notices that refer to this License and to the absence of any warranty;

-and give any other recipients of the Program a copy of this License

-along with the Program.

-

-You may charge a fee for the physical act of transferring a copy, and

-you may at your option offer warranty protection in exchange for a fee.

-

-  2. You may modify your copy or copies of the Program or any portion

-of it, thus forming a work based on the Program, and copy and

-distribute such modifications or work under the terms of Section 1

-above, provided that you also meet all of these conditions:

-

-    a) You must cause the modified files to carry prominent notices

-    stating that you changed the files and the date of any change.

-

-    b) You must cause any work that you distribute or publish, that in

-    whole or in part contains or is derived from the Program or any

-    part thereof, to be licensed as a whole at no charge to all third

-    parties under the terms of this License.

-

-    c) If the modified program normally reads commands interactively

-    when run, you must cause it, when started running for such

-    interactive use in the most ordinary way, to print or display an

-    announcement including an appropriate copyright notice and a

-    notice that there is no warranty (or else, saying that you provide

-    a warranty) and that users may redistribute the program under

-    these conditions, and telling the user how to view a copy of this

-    License.  (Exception: if the Program itself is interactive but

-    does not normally print such an announcement, your work based on

-    the Program is not required to print an announcement.)

-

-These requirements apply to the modified work as a whole.  If

-identifiable sections of that work are not derived from the Program,

-and can be reasonably considered independent and separate works in

-themselves, then this License, and its terms, do not apply to those

-sections when you distribute them as separate works.  But when you

-distribute the same sections as part of a whole which is a work based

-on the Program, the distribution of the whole must be on the terms of

-this License, whose permissions for other licensees extend to the

-entire whole, and thus to each and every part regardless of who wrote it.

-

-Thus, it is not the intent of this section to claim rights or contest

-your rights to work written entirely by you; rather, the intent is to

-exercise the right to control the distribution of derivative or

-collective works based on the Program.

-

-In addition, mere aggregation of another work not based on the Program

-with the Program (or with a work based on the Program) on a volume of

-a storage or distribution medium does not bring the other work under

-the scope of this License.

-

-  3. You may copy and distribute the Program (or a work based on it,

-under Section 2) in object code or executable form under the terms of

-Sections 1 and 2 above provided that you also do one of the following:

-

-    a) Accompany it with the complete corresponding machine-readable

-    source code, which must be distributed under the terms of Sections

-    1 and 2 above on a medium customarily used for software interchange; or,

-

-    b) Accompany it with a written offer, valid for at least three

-    years, to give any third party, for a charge no more than your

-    cost of physically performing source distribution, a complete

-    machine-readable copy of the corresponding source code, to be

-    distributed under the terms of Sections 1 and 2 above on a medium

-    customarily used for software interchange; or,

-

-    c) Accompany it with the information you received as to the offer

-    to distribute corresponding source code.  (This alternative is

-    allowed only for noncommercial distribution and only if you

-    received the program in object code or executable form with such

-    an offer, in accord with Subsection b above.)

-

-The source code for a work means the preferred form of the work for

-making modifications to it.  For an executable work, complete source

-code means all the source code for all modules it contains, plus any

-associated interface definition files, plus the scripts used to

-control compilation and installation of the executable.  However, as a

-special exception, the source code distributed need not include

-anything that is normally distributed (in either source or binary

-form) with the major components (compiler, kernel, and so on) of the

-operating system on which the executable runs, unless that component

-itself accompanies the executable.

-

-If distribution of executable or object code is made by offering

-access to copy from a designated place, then offering equivalent

-access to copy the source code from the same place counts as

-distribution of the source code, even though third parties are not

-compelled to copy the source along with the object code.

-

-  4. You may not copy, modify, sublicense, or distribute the Program

-except as expressly provided under this License.  Any attempt

-otherwise to copy, modify, sublicense or distribute the Program is

-void, and will automatically terminate your rights under this License.

-However, parties who have received copies, or rights, from you under

-this License will not have their licenses terminated so long as such

-parties remain in full compliance.

-

-  5. You are not required to accept this License, since you have not

-signed it.  However, nothing else grants you permission to modify or

-distribute the Program or its derivative works.  These actions are

-prohibited by law if you do not accept this License.  Therefore, by

-modifying or distributing the Program (or any work based on the

-Program), you indicate your acceptance of this License to do so, and

-all its terms and conditions for copying, distributing or modifying

-the Program or works based on it.

-

-  6. Each time you redistribute the Program (or any work based on the

-Program), the recipient automatically receives a license from the

-original licensor to copy, distribute or modify the Program subject to

-these terms and conditions.  You may not impose any further

-restrictions on the recipients' exercise of the rights granted herein.

-You are not responsible for enforcing compliance by third parties to

-this License.

-

-  7. If, as a consequence of a court judgment or allegation of patent

-infringement or for any other reason (not limited to patent issues),

-conditions are imposed on you (whether by court order, agreement or

-otherwise) that contradict the conditions of this License, they do not

-excuse you from the conditions of this License.  If you cannot

-distribute so as to satisfy simultaneously your obligations under this

-License and any other pertinent obligations, then as a consequence you

-may not distribute the Program at all.  For example, if a patent

-license would not permit royalty-free redistribution of the Program by

-all those who receive copies directly or indirectly through you, then

-the only way you could satisfy both it and this License would be to

-refrain entirely from distribution of the Program.

-

-If any portion of this section is held invalid or unenforceable under

-any particular circumstance, the balance of the section is intended to

-apply and the section as a whole is intended to apply in other

-circumstances.

-

-It is not the purpose of this section to induce you to infringe any

-patents or other property right claims or to contest validity of any

-such claims; this section has the sole purpose of protecting the

-integrity of the free software distribution system, which is

-implemented by public license practices.  Many people have made

-generous contributions to the wide range of software distributed

-through that system in reliance on consistent application of that

-system; it is up to the author/donor to decide if he or she is willing

-to distribute software through any other system and a licensee cannot

-impose that choice.

-

-This section is intended to make thoroughly clear what is believed to

-be a consequence of the rest of this License.

-

-  8. If the distribution and/or use of the Program is restricted in

-certain countries either by patents or by copyrighted interfaces, the

-original copyright holder who places the Program under this License

-may add an explicit geographical distribution limitation excluding

-those countries, so that distribution is permitted only in or among

-countries not thus excluded.  In such case, this License incorporates

-the limitation as if written in the body of this License.

-

-  9. The Free Software Foundation may publish revised and/or new versions

-of the General Public License from time to time.  Such new versions will

-be similar in spirit to the present version, but may differ in detail to

-address new problems or concerns.

-

-Each version is given a distinguishing version number.  If the Program

-specifies a version number of this License which applies to it and "any

-later version", you have the option of following the terms and conditions

-either of that version or of any later version published by the Free

-Software Foundation.  If the Program does not specify a version number of

-this License, you may choose any version ever published by the Free Software

-Foundation.

-

-  10. If you wish to incorporate parts of the Program into other free

-programs whose distribution conditions are different, write to the author

-to ask for permission.  For software which is copyrighted by the Free

-Software Foundation, write to the Free Software Foundation; we sometimes

-make exceptions for this.  Our decision will be guided by the two goals

-of preserving the free status of all derivatives of our free software and

-of promoting the sharing and reuse of software generally.

-

-                            NO WARRANTY

-

-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY

-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN

-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES

-PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED

-OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

-MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS

-TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE

-PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,

-REPAIR OR CORRECTION.

-

-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING

-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR

-REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,

-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING

-OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED

-TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY

-YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER

-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE

-POSSIBILITY OF SUCH DAMAGES.

-

-                     END OF TERMS AND CONDITIONS

-

-            How to Apply These Terms to Your New Programs

-

-  If you develop a new program, and you want it to be of the greatest

-possible use to the public, the best way to achieve this is to make it

-free software which everyone can redistribute and change under these terms.

-

-  To do so, attach the following notices to the program.  It is safest

-to attach them to the start of each source file to most effectively

-convey the exclusion of warranty; and each file should have at least

-the "copyright" line and a pointer to where the full notice is found.

-

-    <one line to give the program's name and a brief idea of what it does.>

-    Copyright (C) <year>  <name of author>

-

-    This program is free software; you can redistribute it and/or modify

-    it under the terms of the GNU General Public License as published by

-    the Free Software Foundation; either version 2 of the License, or

-    (at your option) any later version.

-

-    This program is distributed in the hope that it will be useful,

-    but WITHOUT ANY WARRANTY; without even the implied warranty of

-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-    GNU General Public License for more details.

-

-    You should have received a copy of the GNU General Public License

-    along with this program; if not, write to the Free Software

-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-

-Also add information on how to contact you by electronic and paper mail.

-

-If the program is interactive, make it output a short notice like this

-when it starts in an interactive mode:

-

-    Gnomovision version 69, Copyright (C) year  name of author

-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.

-    This is free software, and you are welcome to redistribute it

-    under certain conditions; type `show c' for details.

-

-The hypothetical commands `show w' and `show c' should show the appropriate

-parts of the General Public License.  Of course, the commands you use may

-be called something other than `show w' and `show c'; they could even be

-mouse-clicks or menu items--whatever suits your program.

-

-You should also get your employer (if you work as a programmer) or your

-school, if any, to sign a "copyright disclaimer" for the program, if

-necessary.  Here is a sample; alter the names:

-

-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program

-  `Gnomovision' (which makes passes at compilers) written by James Hacker.

-

-  <signature of Ty Coon>, 1 April 1989

-  Ty Coon, President of Vice

-

-This General Public License does not permit incorporating your program into

-proprietary programs.  If your program is a subroutine library, you may

-consider it more useful to permit linking proprietary applications with the

-library.  If this is what you want to do, use the GNU Library General

-Public License instead of this License.

+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+     59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Library General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+  To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have.  You must make sure that they, too, receive or can get the
+source code.  And you must show them these terms so they know their
+rights.
+
+  We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+  Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software.  If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+  Finally, any free program is threatened constantly by software
+patents.  We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary.  To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                    GNU GENERAL PUBLIC LICENSE
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License.  The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language.  (Hereinafter, translation is included without limitation in
+the term "modification".)  Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope.  The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+  1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+  2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+    a) You must cause the modified files to carry prominent notices
+    stating that you changed the files and the date of any change.
+
+    b) You must cause any work that you distribute or publish, that in
+    whole or in part contains or is derived from the Program or any
+    part thereof, to be licensed as a whole at no charge to all third
+    parties under the terms of this License.
+
+    c) If the modified program normally reads commands interactively
+    when run, you must cause it, when started running for such
+    interactive use in the most ordinary way, to print or display an
+    announcement including an appropriate copyright notice and a
+    notice that there is no warranty (or else, saying that you provide
+    a warranty) and that users may redistribute the program under
+    these conditions, and telling the user how to view a copy of this
+    License.  (Exception: if the Program itself is interactive but
+    does not normally print such an announcement, your work based on
+    the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole.  If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works.  But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+  3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+    a) Accompany it with the complete corresponding machine-readable
+    source code, which must be distributed under the terms of Sections
+    1 and 2 above on a medium customarily used for software interchange; or,
+
+    b) Accompany it with a written offer, valid for at least three
+    years, to give any third party, for a charge no more than your
+    cost of physically performing source distribution, a complete
+    machine-readable copy of the corresponding source code, to be
+    distributed under the terms of Sections 1 and 2 above on a medium
+    customarily used for software interchange; or,
+
+    c) Accompany it with the information you received as to the offer
+    to distribute corresponding source code.  (This alternative is
+    allowed only for noncommercial distribution and only if you
+    received the program in object code or executable form with such
+    an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it.  For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable.  However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+  4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License.  Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+  5. You are not required to accept this License, since you have not
+signed it.  However, nothing else grants you permission to modify or
+distribute the Program or its derivative works.  These actions are
+prohibited by law if you do not accept this License.  Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+  6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions.  You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+  7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all.  For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices.  Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number.  If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+  10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission.  For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this.  Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year  name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Ty Coon>, 1 April 1989
+  Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Library General
+Public License instead of this License.
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/LICENSE b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/LICENSE
index 40a0c8e..d956717 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/LICENSE
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/LICENSE
@@ -1,50 +1,50 @@
-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------

+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.mingw32 b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.mingw32
index a736556..e70a59a 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.mingw32
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.mingw32
@@ -1,130 +1,130 @@
-# Sample makefile for rpng-win / rpng2-win / wpng using mingw32-gcc and make.

-# Greg Roelofs

-# Last modified:  2 June 2007

-#

-#       The programs built by this makefile are described in the book,

-#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and

-#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not

-#       generally for sale anymore, but it's the thought that counts,

-#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )

-#

-# Invoke this makefile from a DOS-prompt window via:

-#

-#       make -f Makefile.mingw32

-#

-# This makefile assumes libpng and zlib have already been built or downloaded

-# and are in subdirectories at the same level as the current subdirectory

-# (as indicated by the PNGDIR and ZDIR macros below).  It makes no assumptions

-# at all about the mingw32 installation tree (W32DIR).  Edit as appropriate.

-#

-# Note that the names of the dynamic and static libpng and zlib libraries

-# used below may change in later releases of the libraries.  This makefile

-# builds both statically and dynamically linked executables by default.

-# (You need only one set, but for testing it can be handy to have both.)

-

-

-# macros --------------------------------------------------------------------

-

-#PNGDIR = ../..#                for libpng-x.y.z/contrib/gregbook builds

-PNGDIR = ../libpng-win32

-PNGINC = -I$(PNGDIR)

-PNGLIBd = $(PNGDIR)/libpng.dll.a        # dynamically linked

-PNGLIBs = $(PNGDIR)/libpng.a            # statically linked, local libpng

-

-#ZDIR = ../../../zlib-win32#    for libpng-x.y.z/contrib/gregbook builds

-ZDIR = ../zlib-win32

-ZINC = -I$(ZDIR)

-ZLIBd = $(ZDIR)/libzdll.a

-ZLIBs = $(ZDIR)/libz.a

-

-# change this to be the path where mingw32 installs its stuff:

-W32DIR =

-#W32DIR = /usr/local/cross-tools/i386-mingw32msvc

-W32INC = -I$(W32DIR)/include

-W32LIB = $(W32DIR)/lib/libuser32.a $(W32DIR)/lib/libgdi32.a

-

-CC = gcc

-#CC = i386-mingw32msvc-gcc #    e.g., Linux -> Win32 cross-compilation

-LD = $(CC)

-RM = rm -f

-CFLAGS = -O -Wall $(INCS) $(MINGW_CCFLAGS)

-# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]

-# [-ansi, -pedantic and -W can also be used]

-LDFLAGS = $(MINGW_LDFLAGS)

-O = .o

-E = .exe

-

-INCS = $(PNGINC) $(ZINC) $(W32INC)

-RLIBSd = $(PNGLIBd) $(ZLIBd) $(W32LIB) -lm

-RLIBSs = $(PNGLIBs) $(ZLIBs) $(W32LIB) -lm

-WLIBSd = $(PNGLIBd) $(ZLIBd)

-WLIBSs = $(PNGLIBs) $(ZLIBs)

-

-RPNG   = rpng-win

-RPNG2  = rpng2-win

-WPNG   = wpng

-

-ROBJSd  = $(RPNG)$(O) readpng.pic$(O)

-ROBJS2d = $(RPNG2)$(O) readpng2.pic$(O)

-WOBJSd  = $(WPNG)$(O) writepng.pic$(O)

-

-RPNGs  = $(RPNG)-static

-RPNG2s = $(RPNG2)-static

-WPNGs  = $(WPNG)-static

-

-ROBJSs  = $(RPNG)$(O) readpng$(O)

-ROBJS2s = $(RPNG2)$(O) readpng2$(O)

-WOBJSs  = $(WPNG)$(O) writepng$(O)

-

-STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)

-DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)

-

-EXES = $(STATIC_EXES) $(DYNAMIC_EXES)

-

-

-# implicit make rules -------------------------------------------------------

-

-.c$(O):

-        $(CC) -c $(CFLAGS) $<

-

-%.pic$(O): %.c

-        $(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<

-

-

-# dependencies --------------------------------------------------------------

-

-all:  $(EXES)

-

-$(RPNGs)$(E): $(ROBJSs)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJSs) $(RLIBSs)

-

-$(RPNG)$(E): $(ROBJSd)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJSd) $(RLIBSd)

-

-$(RPNG2s)$(E): $(ROBJS2s)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS2s) $(RLIBSs)

-

-$(RPNG2)$(E): $(ROBJS2d)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS2d) $(RLIBSd)

-

-$(WPNGs)$(E): $(WOBJSs)

-        $(LD) $(LDFLAGS) -o $@ $(WOBJSs) $(WLIBSs)

-

-$(WPNG)$(E): $(WOBJSd)

-        $(LD) $(LDFLAGS) -o $@ $(WOBJSd) $(WLIBSd)

-

-$(RPNG)$(O):    $(RPNG).c readpng.h

-$(RPNG2)$(O):   $(RPNG2).c readpng2.h

-$(WPNG)$(O):    $(WPNG).c writepng.h

-

-readpng$(O) readpng.pic$(O):    readpng.c readpng.h

-readpng2$(O) readpng2.pic$(O):  readpng2.c readpng2.h

-writepng$(O) writepng.pic$(O):  writepng.c writepng.h

-

-

-# maintenance ---------------------------------------------------------------

-

-clean:

-        $(RM) $(EXES)

-        $(RM) $(ROBJSs) $(ROBJS2s) $(WOBJSs)

-        $(RM) $(ROBJSd) $(ROBJS2d) $(WOBJSd)

+# Sample makefile for rpng-win / rpng2-win / wpng using mingw32-gcc and make.
+# Greg Roelofs
+# Last modified:  2 June 2007
+#
+#       The programs built by this makefile are described in the book,
+#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#       generally for sale anymore, but it's the thought that counts,
+#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )
+#
+# Invoke this makefile from a DOS-prompt window via:
+#
+#       make -f Makefile.mingw32
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are in subdirectories at the same level as the current subdirectory
+# (as indicated by the PNGDIR and ZDIR macros below).  It makes no assumptions
+# at all about the mingw32 installation tree (W32DIR).  Edit as appropriate.
+#
+# Note that the names of the dynamic and static libpng and zlib libraries
+# used below may change in later releases of the libraries.  This makefile
+# builds both statically and dynamically linked executables by default.
+# (You need only one set, but for testing it can be handy to have both.)
+
+
+# macros --------------------------------------------------------------------
+
+#PNGDIR = ../..#                for libpng-x.y.z/contrib/gregbook builds
+PNGDIR = ../libpng-win32
+PNGINC = -I$(PNGDIR)
+PNGLIBd = $(PNGDIR)/libpng.dll.a        # dynamically linked
+PNGLIBs = $(PNGDIR)/libpng.a            # statically linked, local libpng
+
+#ZDIR = ../../../zlib-win32#    for libpng-x.y.z/contrib/gregbook builds
+ZDIR = ../zlib-win32
+ZINC = -I$(ZDIR)
+ZLIBd = $(ZDIR)/libzdll.a
+ZLIBs = $(ZDIR)/libz.a
+
+# change this to be the path where mingw32 installs its stuff:
+W32DIR =
+#W32DIR = /usr/local/cross-tools/i386-mingw32msvc
+W32INC = -I$(W32DIR)/include
+W32LIB = $(W32DIR)/lib/libuser32.a $(W32DIR)/lib/libgdi32.a
+
+CC = gcc
+#CC = i386-mingw32msvc-gcc #    e.g., Linux -> Win32 cross-compilation
+LD = $(CC)
+RM = rm -f
+CFLAGS = -O -Wall $(INCS) $(MINGW_CCFLAGS)
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+# [-ansi, -pedantic and -W can also be used]
+LDFLAGS = $(MINGW_LDFLAGS)
+O = .o
+E = .exe
+
+INCS = $(PNGINC) $(ZINC) $(W32INC)
+RLIBSd = $(PNGLIBd) $(ZLIBd) $(W32LIB) -lm
+RLIBSs = $(PNGLIBs) $(ZLIBs) $(W32LIB) -lm
+WLIBSd = $(PNGLIBd) $(ZLIBd)
+WLIBSs = $(PNGLIBs) $(ZLIBs)
+
+RPNG   = rpng-win
+RPNG2  = rpng2-win
+WPNG   = wpng
+
+ROBJSd  = $(RPNG)$(O) readpng.pic$(O)
+ROBJS2d = $(RPNG2)$(O) readpng2.pic$(O)
+WOBJSd  = $(WPNG)$(O) writepng.pic$(O)
+
+RPNGs  = $(RPNG)-static
+RPNG2s = $(RPNG2)-static
+WPNGs  = $(WPNG)-static
+
+ROBJSs  = $(RPNG)$(O) readpng$(O)
+ROBJS2s = $(RPNG2)$(O) readpng2$(O)
+WOBJSs  = $(WPNG)$(O) writepng$(O)
+
+STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
+DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+        $(CC) -c $(CFLAGS) $<
+
+%.pic$(O): %.c
+        $(CC) -c $(CFLAGS) -DPNG_BUILD_DLL -o $@ $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNGs)$(E): $(ROBJSs)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJSs) $(RLIBSs)
+
+$(RPNG)$(E): $(ROBJSd)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJSd) $(RLIBSd)
+
+$(RPNG2s)$(E): $(ROBJS2s)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS2s) $(RLIBSs)
+
+$(RPNG2)$(E): $(ROBJS2d)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS2d) $(RLIBSd)
+
+$(WPNGs)$(E): $(WOBJSs)
+        $(LD) $(LDFLAGS) -o $@ $(WOBJSs) $(WLIBSs)
+
+$(WPNG)$(E): $(WOBJSd)
+        $(LD) $(LDFLAGS) -o $@ $(WOBJSd) $(WLIBSd)
+
+$(RPNG)$(O):    $(RPNG).c readpng.h
+$(RPNG2)$(O):   $(RPNG2).c readpng2.h
+$(WPNG)$(O):    $(WPNG).c writepng.h
+
+readpng$(O) readpng.pic$(O):    readpng.c readpng.h
+readpng2$(O) readpng2.pic$(O):  readpng2.c readpng2.h
+writepng$(O) writepng.pic$(O):  writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+        $(RM) $(EXES)
+        $(RM) $(ROBJSs) $(ROBJS2s) $(WOBJSs)
+        $(RM) $(ROBJSd) $(ROBJS2d) $(WOBJSd)
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.sgi b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.sgi
index 8773a00..91623ac 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.sgi
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.sgi
@@ -1,104 +1,104 @@
-# Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.

-# Greg Roelofs

-# Last modified:  7 March 2002

-#

-#       The programs built by this makefile are described in the book,

-#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and

-#       Associates, 1999).  Go buy a copy, eh?  Buy some for friends

-#       and family, too.  (Not that this is a blatant plug or anything.)

-#

-# Invoke this makefile from a shell prompt in the usual way; for example:

-#

-#       make -f Makefile.sgi

-#

-# This makefile assumes libpng and zlib have already been built or downloaded

-# and are both installed in /usr/local/{include,lib} (as indicated by the

-# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of

-# the PNGINC, PNGLIB, ZINC and ZLIB lines.

-#

-# This makefile builds dynamically linked executables (against libpng and zlib,

-# that is), but that can be changed by uncommenting the appropriate PNGLIB and

-# ZLIB lines.

-

-

-# macros --------------------------------------------------------------------

-

-PNGINC = -I/usr/local/include/libpng15

-PNGLIB = -L/usr/local/lib -lpng15         # dynamically linked against libpng

-#PNGLIB = /usr/local/lib/libpng15.a # statically linked against libpng

-# or:

-#PNGINC = -I../..

-#PNGLIB = -L../.. -lpng

-#PNGLIB = ../../libpng.a

-

-ZINC = -I/usr/local/include

-ZLIB = -L/usr/local/lib -lz             # dynamically linked against zlib

-#ZLIB = /usr/local/lib/libz.a           # statically linked against zlib

-#ZINC = -I../zlib

-#ZLIB = -L../zlib -lz

-#ZLIB = ../../../zlib/libz.a

-

-XINC = -I/usr/include/X11               # old-style, stock X distributions

-XLIB = -L/usr/lib/X11 -lX11

-#XINC = -I/usr/openwin/include          # Sun workstations (OpenWindows)

-#XLIB = -L/usr/openwin/lib -lX11

-#XINC = -I/usr/X11R6/include            # new X distributions (XFree86, etc.)

-#XLIB = -L/usr/X11R6/lib -lX11

-

-INCS = $(PNGINC) $(ZINC) $(XINC)

-RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm

-WLIBS = $(PNGLIB) $(ZLIB)

-

-CC = cc

-LD = cc

-RM = rm -f

-# ABI must be the same as that used to build libpng.

-ABI=

-CFLAGS = $(ABI) -O -fullwarn $(INCS)

-LDFLAGS = $(ABI)

-O = .o

-E =

-

-RPNG  = rpng-x

-RPNG2 = rpng2-x

-WPNG  = wpng

-

-ROBJS  = $(RPNG)$(O) readpng$(O)

-ROBJS2 = $(RPNG2)$(O) readpng2$(O)

-WOBJS  = $(WPNG)$(O) writepng$(O)

-

-EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)

-

-

-# implicit make rules -------------------------------------------------------

-

-.c$(O):

-        $(CC) -c $(CFLAGS) $<

-

-

-# dependencies --------------------------------------------------------------

-

-all:  $(EXES)

-

-$(RPNG)$(E): $(ROBJS)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)

-

-$(RPNG2)$(E): $(ROBJS2)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)

-

-$(WPNG)$(E): $(WOBJS)

-        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)

-

-$(RPNG)$(O):    $(RPNG).c readpng.h

-$(RPNG2)$(O):   $(RPNG2).c readpng2.h

-$(WPNG)$(O):    $(WPNG).c writepng.h

-

-readpng$(O):    readpng.c readpng.h

-readpng2$(O):   readpng2.c readpng2.h

-writepng$(O):   writepng.c writepng.h

-

-

-# maintenance ---------------------------------------------------------------

-

-clean:

-        $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

+# Sample makefile for rpng-x / rpng2-x / wpng for SGI using cc and make.
+# Greg Roelofs
+# Last modified:  7 March 2002
+#
+#       The programs built by this makefile are described in the book,
+#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#       Associates, 1999).  Go buy a copy, eh?  Buy some for friends
+#       and family, too.  (Not that this is a blatant plug or anything.)
+#
+# Invoke this makefile from a shell prompt in the usual way; for example:
+#
+#       make -f Makefile.sgi
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are both installed in /usr/local/{include,lib} (as indicated by the
+# PNG* and Z* macros below).  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIB, ZINC and ZLIB lines.
+#
+# This makefile builds dynamically linked executables (against libpng and zlib,
+# that is), but that can be changed by uncommenting the appropriate PNGLIB and
+# ZLIB lines.
+
+
+# macros --------------------------------------------------------------------
+
+PNGINC = -I/usr/local/include/libpng15
+PNGLIB = -L/usr/local/lib -lpng15         # dynamically linked against libpng
+#PNGLIB = /usr/local/lib/libpng15.a # statically linked against libpng
+# or:
+#PNGINC = -I../..
+#PNGLIB = -L../.. -lpng
+#PNGLIB = ../../libpng.a
+
+ZINC = -I/usr/local/include
+ZLIB = -L/usr/local/lib -lz             # dynamically linked against zlib
+#ZLIB = /usr/local/lib/libz.a           # statically linked against zlib
+#ZINC = -I../zlib
+#ZLIB = -L../zlib -lz
+#ZLIB = ../../../zlib/libz.a
+
+XINC = -I/usr/include/X11               # old-style, stock X distributions
+XLIB = -L/usr/lib/X11 -lX11
+#XINC = -I/usr/openwin/include          # Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+#XINC = -I/usr/X11R6/include            # new X distributions (XFree86, etc.)
+#XLIB = -L/usr/X11R6/lib -lX11
+
+INCS = $(PNGINC) $(ZINC) $(XINC)
+RLIBS = $(PNGLIB) $(ZLIB) $(XLIB) -lm
+WLIBS = $(PNGLIB) $(ZLIB)
+
+CC = cc
+LD = cc
+RM = rm -f
+# ABI must be the same as that used to build libpng.
+ABI=
+CFLAGS = $(ABI) -O -fullwarn $(INCS)
+LDFLAGS = $(ABI)
+O = .o
+E =
+
+RPNG  = rpng-x
+RPNG2 = rpng2-x
+WPNG  = wpng
+
+ROBJS  = $(RPNG)$(O) readpng$(O)
+ROBJS2 = $(RPNG2)$(O) readpng2$(O)
+WOBJS  = $(WPNG)$(O) writepng$(O)
+
+EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+        $(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNG)$(E): $(ROBJS)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBS)
+
+$(RPNG2)$(E): $(ROBJS2)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBS)
+
+$(WPNG)$(E): $(WOBJS)
+        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBS)
+
+$(RPNG)$(O):    $(RPNG).c readpng.h
+$(RPNG2)$(O):   $(RPNG2).c readpng2.h
+$(WPNG)$(O):    $(WPNG).c writepng.h
+
+readpng$(O):    readpng.c readpng.h
+readpng2$(O):   readpng2.c readpng2.h
+writepng$(O):   writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+        $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.unx b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.unx
index 3bffc2f..b52d8b6 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.unx
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.unx
@@ -1,132 +1,132 @@
-# Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.

-# Greg Roelofs

-# Last modified:  2 June 2007

-#

-#       The programs built by this makefile are described in the book,

-#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and

-#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not

-#       generally for sale anymore, but it's the thought that counts,

-#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )

-#

-# Invoke this makefile from a shell prompt in the usual way; for example:

-#

-#       make -f Makefile.unx

-#

-# This makefile assumes libpng and zlib have already been built or downloaded

-# and are installed in /usr/local/{include,lib} or as otherwise indicated by

-# the PNG* and Z* macros below.  Edit as appropriate--choose only ONE each of

-# the PNGINC, PNGLIBd, PNGLIBs, ZINC, ZLIBd and ZLIBs lines.

-#

-# This makefile builds both dynamically and statically linked executables

-# (against libpng and zlib, that is), but that can be changed by modifying

-# the "EXES =" line.  (You need only one set, but for testing it can be handy

-# to have both.)

-

-

-# macros --------------------------------------------------------------------

-

-#PNGDIR = /usr/local/lib

-#PNGINC = -I/usr/local/include/libpng15

-#PNGLIBd = -L$(PNGDIR) -lpng15 # dynamically linked, installed libpng

-#PNGLIBs = $(PNGDIR)/libpng15.a # statically linked, installed libpng

-# or:

-PNGDIR = ../..# this one is for libpng-x.y.z/contrib/gregbook builds

-#PNGDIR = ../libpng

-PNGINC = -I$(PNGDIR)

-PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng15      # dynamically linked

-PNGLIBs = $(PNGDIR)/libpng.a            # statically linked, local libpng

-

-ZDIR = /usr/local/lib

-#ZDIR = /usr/lib64

-ZINC = -I/usr/local/include

-ZLIBd = -L$(ZDIR) -lz                   # dynamically linked against zlib

-ZLIBs = $(ZDIR)/libz.a                  # statically linked against zlib

-# or:

-#ZDIR = ../zlib

-#ZINC = -I$(ZDIR)

-#ZLIBd = -Wl,-rpath,$(ZDIR) -L$(ZDIR) -lz  # -rpath allows in-place testing

-#ZLIBs = $(ZDIR)/libz.a

-

-#XINC = -I/usr/include                  # old-style, stock X distributions

-#XLIB = -L/usr/lib/X11 -lX11            #  (including SGI IRIX)

-#XINC = -I/usr/openwin/include          # Sun workstations (OpenWindows)

-#XLIB = -L/usr/openwin/lib -lX11

-XINC = -I/usr/X11R6/include             # new X distributions (X.org, etc.)

-XLIB = -L/usr/X11R6/lib -lX11

-#XLIB = -L/usr/X11R6/lib64 -lX11        # e.g., Red Hat on AMD64

-

-INCS = $(PNGINC) $(ZINC) $(XINC)

-RLIBSd = $(PNGLIBd) $(ZLIBd) $(XLIB) -lm

-RLIBSs = $(PNGLIBs) $(ZLIBs) $(XLIB) -lm

-WLIBSd = $(PNGLIBd) $(ZLIBd) -lm

-WLIBSs = $(PNGLIBs) $(ZLIBs)

-

-CC = gcc

-LD = gcc

-RM = rm -f

-CFLAGS = -O -Wall $(INCS) -DFEATURE_LOOP

-# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]

-# [-ansi, -pedantic and -W can also be used]

-LDFLAGS =

-O = .o

-E =

-

-RPNG   = rpng-x

-RPNG2  = rpng2-x

-WPNG   = wpng

-

-RPNGs  = $(RPNG)-static

-RPNG2s = $(RPNG2)-static

-WPNGs  = $(WPNG)-static

-

-ROBJS  = $(RPNG)$(O) readpng$(O)

-ROBJS2 = $(RPNG2)$(O) readpng2$(O)

-WOBJS  = $(WPNG)$(O) writepng$(O)

-

-STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)

-DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)

-

-EXES = $(STATIC_EXES) $(DYNAMIC_EXES)

-

-

-# implicit make rules -------------------------------------------------------

-

-.c$(O):

-        $(CC) -c $(CFLAGS) $<

-

-

-# dependencies --------------------------------------------------------------

-

-all:  $(EXES)

-

-$(RPNGs)$(E): $(ROBJS)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSs)

-

-$(RPNG)$(E): $(ROBJS)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSd)

-

-$(RPNG2s)$(E): $(ROBJS2)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSs)

-

-$(RPNG2)$(E): $(ROBJS2)

-        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSd)

-

-$(WPNGs)$(E): $(WOBJS)

-        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSs)

-

-$(WPNG)$(E): $(WOBJS)

-        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSd)

-

-$(RPNG)$(O):    $(RPNG).c readpng.h

-$(RPNG2)$(O):   $(RPNG2).c readpng2.h

-$(WPNG)$(O):    $(WPNG).c writepng.h

-

-readpng$(O):    readpng.c readpng.h

-readpng2$(O):   readpng2.c readpng2.h

-writepng$(O):   writepng.c writepng.h

-

-

-# maintenance ---------------------------------------------------------------

-

-clean:

-        $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

+# Sample makefile for rpng-x / rpng2-x / wpng using gcc and make.
+# Greg Roelofs
+# Last modified:  2 June 2007
+#
+#       The programs built by this makefile are described in the book,
+#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#       generally for sale anymore, but it's the thought that counts,
+#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )
+#
+# Invoke this makefile from a shell prompt in the usual way; for example:
+#
+#       make -f Makefile.unx
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are installed in /usr/local/{include,lib} or as otherwise indicated by
+# the PNG* and Z* macros below.  Edit as appropriate--choose only ONE each of
+# the PNGINC, PNGLIBd, PNGLIBs, ZINC, ZLIBd and ZLIBs lines.
+#
+# This makefile builds both dynamically and statically linked executables
+# (against libpng and zlib, that is), but that can be changed by modifying
+# the "EXES =" line.  (You need only one set, but for testing it can be handy
+# to have both.)
+
+
+# macros --------------------------------------------------------------------
+
+#PNGDIR = /usr/local/lib
+#PNGINC = -I/usr/local/include/libpng15
+#PNGLIBd = -L$(PNGDIR) -lpng15 # dynamically linked, installed libpng
+#PNGLIBs = $(PNGDIR)/libpng15.a # statically linked, installed libpng
+# or:
+PNGDIR = ../..# this one is for libpng-x.y.z/contrib/gregbook builds
+#PNGDIR = ../libpng
+PNGINC = -I$(PNGDIR)
+PNGLIBd = -Wl,-rpath,$(PNGDIR) -L$(PNGDIR) -lpng15      # dynamically linked
+PNGLIBs = $(PNGDIR)/libpng.a            # statically linked, local libpng
+
+ZDIR = /usr/local/lib
+#ZDIR = /usr/lib64
+ZINC = -I/usr/local/include
+ZLIBd = -L$(ZDIR) -lz                   # dynamically linked against zlib
+ZLIBs = $(ZDIR)/libz.a                  # statically linked against zlib
+# or:
+#ZDIR = ../zlib
+#ZINC = -I$(ZDIR)
+#ZLIBd = -Wl,-rpath,$(ZDIR) -L$(ZDIR) -lz  # -rpath allows in-place testing
+#ZLIBs = $(ZDIR)/libz.a
+
+#XINC = -I/usr/include                  # old-style, stock X distributions
+#XLIB = -L/usr/lib/X11 -lX11            #  (including SGI IRIX)
+#XINC = -I/usr/openwin/include          # Sun workstations (OpenWindows)
+#XLIB = -L/usr/openwin/lib -lX11
+XINC = -I/usr/X11R6/include             # new X distributions (X.org, etc.)
+XLIB = -L/usr/X11R6/lib -lX11
+#XLIB = -L/usr/X11R6/lib64 -lX11        # e.g., Red Hat on AMD64
+
+INCS = $(PNGINC) $(ZINC) $(XINC)
+RLIBSd = $(PNGLIBd) $(ZLIBd) $(XLIB) -lm
+RLIBSs = $(PNGLIBs) $(ZLIBs) $(XLIB) -lm
+WLIBSd = $(PNGLIBd) $(ZLIBd) -lm
+WLIBSs = $(PNGLIBs) $(ZLIBs)
+
+CC = gcc
+LD = gcc
+RM = rm -f
+CFLAGS = -O -Wall $(INCS) -DFEATURE_LOOP
+# [note that -Wall is a gcc-specific compilation flag ("most warnings on")]
+# [-ansi, -pedantic and -W can also be used]
+LDFLAGS =
+O = .o
+E =
+
+RPNG   = rpng-x
+RPNG2  = rpng2-x
+WPNG   = wpng
+
+RPNGs  = $(RPNG)-static
+RPNG2s = $(RPNG2)-static
+WPNGs  = $(WPNG)-static
+
+ROBJS  = $(RPNG)$(O) readpng$(O)
+ROBJS2 = $(RPNG2)$(O) readpng2$(O)
+WOBJS  = $(WPNG)$(O) writepng$(O)
+
+STATIC_EXES  = $(RPNGs)$(E) $(RPNG2s)$(E) $(WPNGs)$(E)
+DYNAMIC_EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+EXES = $(STATIC_EXES) $(DYNAMIC_EXES)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+        $(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNGs)$(E): $(ROBJS)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSs)
+
+$(RPNG)$(E): $(ROBJS)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS) $(RLIBSd)
+
+$(RPNG2s)$(E): $(ROBJS2)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSs)
+
+$(RPNG2)$(E): $(ROBJS2)
+        $(LD) $(LDFLAGS) -o $@ $(ROBJS2) $(RLIBSd)
+
+$(WPNGs)$(E): $(WOBJS)
+        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSs)
+
+$(WPNG)$(E): $(WOBJS)
+        $(LD) $(LDFLAGS) -o $@ $(WOBJS) $(WLIBSd)
+
+$(RPNG)$(O):    $(RPNG).c readpng.h
+$(RPNG2)$(O):   $(RPNG2).c readpng2.h
+$(WPNG)$(O):    $(WPNG).c writepng.h
+
+readpng$(O):    readpng.c readpng.h
+readpng2$(O):   readpng2.c readpng2.h
+writepng$(O):   writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+        $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.w32 b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.w32
index eced083..41cfb23 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.w32
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/Makefile.w32
@@ -1,113 +1,113 @@
-# Sample makefile for rpng-win / rpng2-win / wpng using MSVC and NMAKE.

-# Greg Roelofs

-# Last modified:  2 June 2007

-#

-#       The programs built by this makefile are described in the book,

-#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and

-#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not

-#       generally for sale anymore, but it's the thought that counts,

-#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )

-#

-# Invoke this makefile from a DOS prompt window via:

-#

-#       %devstudio%\vc\bin\vcvars32.bat

-#       nmake -nologo -f Makefile.w32

-#

-# where %devstudio% is the installation directory for MSVC / DevStudio.  If

-# you get "environment out of space" errors, create a desktop shortcut with

-# "c:\windows\command.com /e:4096" as the program command line and set the

-# working directory to this directory.  Then double-click to open the new

-# DOS-prompt window with a bigger environment and retry the commands above.

-#

-# This makefile assumes libpng and zlib have already been built or downloaded

-# and are in subdirectories at the same level as the current subdirectory

-# (as indicated by the PNGPATH and ZPATH macros below).  Edit as appropriate.

-#

-# Note that the names of the dynamic and static libpng and zlib libraries

-# used below may change in later releases of the libraries.  This makefile

-# builds statically linked executables, but that can be changed by uncom-

-# menting the appropriate PNGLIB and ZLIB lines.

-

-!include <ntwin32.mak>

-

-

-# macros --------------------------------------------------------------------

-

-PNGPATH = ../libpng

-PNGINC = -I$(PNGPATH)

-#PNGLIB = $(PNGPATH)/pngdll.lib

-PNGLIB = $(PNGPATH)/libpng.lib

-

-ZPATH = ../zlib

-ZINC = -I$(ZPATH)

-#ZLIB = $(ZPATH)/zlibdll.lib

-ZLIB = $(ZPATH)/zlibstat.lib

-

-WINLIBS = -defaultlib:user32.lib gdi32.lib

-# ["real" apps may also need comctl32.lib, comdlg32.lib, winmm.lib, etc.]

-

-INCS = $(PNGINC) $(ZINC)

-RLIBS = $(PNGLIB) $(ZLIB) $(WINLIBS)

-WLIBS = $(PNGLIB) $(ZLIB)

-

-CC = cl

-LD = link

-RM = del

-CFLAGS = -nologo -O -W3 $(INCS) $(cvars)

-# [note that -W3 is an MSVC-specific compilation flag ("all warnings on")]

-# [see %devstudio%\vc\include\win32.mak for cvars macro definition]

-O = .obj

-E = .exe

-

-RLDFLAGS = -nologo -subsystem:windows

-WLDFLAGS = -nologo

-

-RPNG  = rpng-win

-RPNG2 = rpng2-win

-WPNG  = wpng

-

-ROBJS  = $(RPNG)$(O) readpng$(O)

-ROBJS2 = $(RPNG2)$(O) readpng2$(O)

-WOBJS  = $(WPNG)$(O) writepng$(O)

-

-EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)

-

-

-# implicit make rules -------------------------------------------------------

-

-.c$(O):

-        $(CC) -c $(CFLAGS) $<

-

-

-# dependencies --------------------------------------------------------------

-

-all:  $(EXES)

-

-$(RPNG)$(E): $(ROBJS)

-        $(LD) $(RLDFLAGS) -out:$@ $(ROBJS) $(RLIBS)

-

-$(RPNG2)$(E): $(ROBJS2)

-        $(LD) $(RLDFLAGS) -out:$@ $(ROBJS2) $(RLIBS)

-

-$(WPNG)$(E): $(WOBJS)

-        $(LD) $(WLDFLAGS) -out:$@ $(WOBJS) $(WLIBS)

-

-$(RPNG)$(O):    $(RPNG).c readpng.h

-$(RPNG2)$(O):   $(RPNG2).c readpng2.h

-$(WPNG)$(O):    $(WPNG).c writepng.h

-

-readpng$(O):    readpng.c readpng.h

-readpng2$(O):   readpng2.c readpng2.h

-writepng$(O):   writepng.c writepng.h

-

-

-# maintenance ---------------------------------------------------------------

-

-clean:

-#       ideally we could just do this:

-#       $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)

-#       ...but the Windows "DEL" command is none too bright, so:

-        $(RM) r*$(E)

-        $(RM) w*$(E)

-        $(RM) r*$(O)

-        $(RM) w*$(O)

+# Sample makefile for rpng-win / rpng2-win / wpng using MSVC and NMAKE.
+# Greg Roelofs
+# Last modified:  2 June 2007
+#
+#       The programs built by this makefile are described in the book,
+#       "PNG:  The Definitive Guide," by Greg Roelofs (O'Reilly and
+#       Associates, 1999).  Go buy a copy, eh?  Well, OK, it's not
+#       generally for sale anymore, but it's the thought that counts,
+#       right?  (Hint:  http://www.libpng.org/pub/png/book/ )
+#
+# Invoke this makefile from a DOS prompt window via:
+#
+#       %devstudio%\vc\bin\vcvars32.bat
+#       nmake -nologo -f Makefile.w32
+#
+# where %devstudio% is the installation directory for MSVC / DevStudio.  If
+# you get "environment out of space" errors, create a desktop shortcut with
+# "c:\windows\command.com /e:4096" as the program command line and set the
+# working directory to this directory.  Then double-click to open the new
+# DOS-prompt window with a bigger environment and retry the commands above.
+#
+# This makefile assumes libpng and zlib have already been built or downloaded
+# and are in subdirectories at the same level as the current subdirectory
+# (as indicated by the PNGPATH and ZPATH macros below).  Edit as appropriate.
+#
+# Note that the names of the dynamic and static libpng and zlib libraries
+# used below may change in later releases of the libraries.  This makefile
+# builds statically linked executables, but that can be changed by uncom-
+# menting the appropriate PNGLIB and ZLIB lines.
+
+!include <ntwin32.mak>
+
+
+# macros --------------------------------------------------------------------
+
+PNGPATH = ../libpng
+PNGINC = -I$(PNGPATH)
+#PNGLIB = $(PNGPATH)/pngdll.lib
+PNGLIB = $(PNGPATH)/libpng.lib
+
+ZPATH = ../zlib
+ZINC = -I$(ZPATH)
+#ZLIB = $(ZPATH)/zlibdll.lib
+ZLIB = $(ZPATH)/zlibstat.lib
+
+WINLIBS = -defaultlib:user32.lib gdi32.lib
+# ["real" apps may also need comctl32.lib, comdlg32.lib, winmm.lib, etc.]
+
+INCS = $(PNGINC) $(ZINC)
+RLIBS = $(PNGLIB) $(ZLIB) $(WINLIBS)
+WLIBS = $(PNGLIB) $(ZLIB)
+
+CC = cl
+LD = link
+RM = del
+CFLAGS = -nologo -O -W3 $(INCS) $(cvars)
+# [note that -W3 is an MSVC-specific compilation flag ("all warnings on")]
+# [see %devstudio%\vc\include\win32.mak for cvars macro definition]
+O = .obj
+E = .exe
+
+RLDFLAGS = -nologo -subsystem:windows
+WLDFLAGS = -nologo
+
+RPNG  = rpng-win
+RPNG2 = rpng2-win
+WPNG  = wpng
+
+ROBJS  = $(RPNG)$(O) readpng$(O)
+ROBJS2 = $(RPNG2)$(O) readpng2$(O)
+WOBJS  = $(WPNG)$(O) writepng$(O)
+
+EXES = $(RPNG)$(E) $(RPNG2)$(E) $(WPNG)$(E)
+
+
+# implicit make rules -------------------------------------------------------
+
+.c$(O):
+        $(CC) -c $(CFLAGS) $<
+
+
+# dependencies --------------------------------------------------------------
+
+all:  $(EXES)
+
+$(RPNG)$(E): $(ROBJS)
+        $(LD) $(RLDFLAGS) -out:$@ $(ROBJS) $(RLIBS)
+
+$(RPNG2)$(E): $(ROBJS2)
+        $(LD) $(RLDFLAGS) -out:$@ $(ROBJS2) $(RLIBS)
+
+$(WPNG)$(E): $(WOBJS)
+        $(LD) $(WLDFLAGS) -out:$@ $(WOBJS) $(WLIBS)
+
+$(RPNG)$(O):    $(RPNG).c readpng.h
+$(RPNG2)$(O):   $(RPNG2).c readpng2.h
+$(WPNG)$(O):    $(WPNG).c writepng.h
+
+readpng$(O):    readpng.c readpng.h
+readpng2$(O):   readpng2.c readpng2.h
+writepng$(O):   writepng.c writepng.h
+
+
+# maintenance ---------------------------------------------------------------
+
+clean:
+#       ideally we could just do this:
+#       $(RM) $(EXES) $(ROBJS) $(ROBJS2) $(WOBJS)
+#       ...but the Windows "DEL" command is none too bright, so:
+        $(RM) r*$(E)
+        $(RM) w*$(E)
+        $(RM) r*$(O)
+        $(RM) w*$(O)
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/README b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/README
index 791fec8..7b1f6a3 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/README
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/README
@@ -1,186 +1,186 @@
-                     ===========================

-                      PNG: The Definitive Guide

-                     ===========================

-

-                             Source Code

-

-Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,

-cross-platform demo programs that show how to use the libpng reference

-library:  rpng, rpng2 and wpng.  rpng and rpng2 are viewers; the first is

-a very simple example that that shows how a standard file-viewer might use

-libpng, while the second is designed to process streaming data and shows

-how a web browser might be written.  wpng is a simple command-line program

-that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets

-of PBMPLUS/NetPBM) and converts them to PNG.

-

-The source code for all three demo programs currently compiles under

-Unix, OpenVMS, and 32-bit Windows.  (Special thanks to Martin Zinser,

-zinser@decus.de, for making the necessary changes for OpenVMS and for

-providing an appropriate build script.)  Build instructions can be found

-below.

-

-Files:

-

-   README             this file

-   LICENSE            terms of distribution and reuse (BSD-like or GNU GPL)

-   COPYING            GNU General Public License (GPL)

-

-   Makefile.unx       Unix makefile

-   Makefile.w32       Windows (MSVC) makefile

-   makevms.com        OpenVMS build script

-

-   rpng-win.c         Windows front end for the basic viewer

-   rpng-x.c           X Window System (Unix, OpenVMS) front end

-   readpng.c          generic back end for the basic viewer

-   readpng.h          header file for the basic viewer

-

-   rpng2-win.c        Windows front end for the progressive viewer

-   rpng2-x.c          X front end for the progressive viewer

-   readpng2.c         generic back end for the progressive viewer

-   readpng2.h         header file for the progressive viewer

-

-   wpng.c             generic (text) front end for the converter

-   writepng.c         generic back end for the converter

-   writepng.h         header file for the converter

-

-   toucan.png         transparent PNG for testing (by Stefan Schneider)

-

-Note that, although the programs are designed to be functional, their

-primary purpose is to illustrate how to use libpng to add PNG support to

-other programs.  As such, their user interfaces are crude and definitely

-are not intended for everyday use.

-

-Please see http://www.libpng.org/pub/png/pngbook.html for further infor-

-mation and links to the latest version of the source code, and Chapters

-13-15 of the book for detailed discussion of the three programs.

-

-Greg Roelofs

-http://pobox.com/~newt/greg_contact.html

-16 March 2008

-

-

-BUILD INSTRUCTIONS

-

- - Prerequisites (in order of compilation):

-

-      - zlib            http://zlib.net/

-      - libpng          http://www.libpng.org/pub/png/libpng.html

-      - pngbook         http://www.libpng.org/pub/png/book/sources.html

-

-     The pngbook demo programs are explicitly designed to demonstrate proper

-     coding techniques for using the libpng reference library.  As a result,

-     you need to download and build both zlib (on which libpng depends) and

-     libpng.  A common build setup is to place the zlib, libpng and pngbook

-     subdirectory trees ("folders") in the same parent directory.  Then the

-     libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),

-     and similarly for the pngbook build.

-

-     Note that all three packages are designed to be built from a command

-     line by default; those who wish to use a graphical or other integrated

-     development environments are on their own.

-

-

- - Unix:

-

-     Unpack the latest pngbook sources (which should correspond to this

-     README file) into a directory and change into that directory.

-

-     Copy Makefile.unx to Makefile and edit the PNG* and Z* variables

-     appropriately (possibly also the X* variables if necessary).

-

-     make

-

-     There is no "install" target, so copy the three executables somewhere

-     in your path or run them from the current directory.  All three will

-     print a basic usage screen when run without any command-line arguments;

-     see the book for more details.

-

-

- - Windows:

-

-     Unpack the latest pngbook sources (which should correspond to this

-     README file) into a folder, open a "DOS shell" or "command prompt"

-     or equivalent command-line window, and cd into the folder where you

-     unpacked the source code.

-

-     For MSVC, set up the necessary environment variables by invoking

-

-        %devstudio%\vc\bin\vcvars32.bat

-

-     where where %devstudio% is the installation directory for MSVC /

-     DevStudio.  If you get "environment out of space" errors under 95/98,

-     create a desktop shortcut with "c:\windows\command.com /e:4096" as

-     the program command line and set the working directory to the pngbook

-     directory.  Then double-click to open the new DOS-prompt window with

-     a bigger environment and retry the commands above.

-

-     Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables

-     appropriately (possibly also the "INC" and "LIB" variables if needed).

-     Note that the names of the dynamic and static libpng and zlib libraries

-     used in the makefile may change in later releases of the libraries.

-     Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.

-     This makefile therefore builds statically linked executables, but if

-     the DLL problems ever get fixed, uncommenting the appropriate PNGLIB

-     and ZLIB lines will build dynamically linked executables instead.

-

-     Do the build by typing

-

-        nmake

-

-     The result should be three executables:  rpng-win.exe, rpng2-win.exe,

-     and wpng.exe.  Copy them somewhere in your PATH or run them from the

-     current folder.  Like the Unix versions, the two windowed programs

-     (rpng and rpng2) now display a usage screen in a console window when

-     invoked without command-line arguments; this is new behavior as of

-     the June 2001 release.  Note that the programs use the Unix-style "-"

-     character to specify options, instead of the more common DOS/Windows

-     "/" character.  (For example:  "rpng2-win -bgpat 4 foo.png", not

-     "rpng2-win /bgpat 4 foo.png")

-

-

- - OpenVMS:

-

-     Unpack the pngbook sources into a subdirectory and change into that

-     subdirectory.

-

-     Edit makevms.com appropriately, specifically the zpath and pngpath

-     variables.

-

-     @makevms

-

-     To run the programs, they probably first need to be set up as "foreign

-     symbols," with "disk" and "dir" set appropriately:

-

-     $ rpng  == "$disk:[dir]rpng-x.exe"

-     $ rpng2 == "$disk:[dir]rpng2-x.exe"

-     $ wpng  == "$disk:[dir]wpng.exe"

-

-     All three will print a basic usage screen when run without any command-

-     line arguments; see the book for more details.  Note that the options

-     style is Unix-like, i.e., preceded by "-" rather than "/".

-

-

-RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO

-

-     rpng is a simple PNG viewer that can display transparent PNGs with a

-     specified background color; for example,

-

-        rpng -bgcolor \#ff0000 toucan.png

-

-     would display the image with a red background.  rpng2 is a progressive

-     viewer that simulates a web browser in some respects; it can display

-     images against either a background color or a dynamically generated

-     background image.  For example:

-

-        rpng2 -bgpat 16 toucan.png

-

-     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM

-     format (.pgm or .ppm) to PNG; for example,

-

-        wpng -time < toucan-notrans.ppm > toucan-notrans.png

-

-     would convert the specified PPM file (using redirection) to PNG, auto-

-     matically setting the PNG modification-time chunk.

-

-     All options can be abbreviated to the shortest unique value; for example,

-     "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.

+                     ===========================
+                      PNG: The Definitive Guide
+                     ===========================
+
+                             Source Code
+
+Chapters 13, 14 and 15 of "PNG: The Definitive Guide" discuss three free,
+cross-platform demo programs that show how to use the libpng reference
+library:  rpng, rpng2 and wpng.  rpng and rpng2 are viewers; the first is
+a very simple example that that shows how a standard file-viewer might use
+libpng, while the second is designed to process streaming data and shows
+how a web browser might be written.  wpng is a simple command-line program
+that reads binary PGM and PPM files (the ``raw'' grayscale and RGB subsets
+of PBMPLUS/NetPBM) and converts them to PNG.
+
+The source code for all three demo programs currently compiles under
+Unix, OpenVMS, and 32-bit Windows.  (Special thanks to Martin Zinser,
+zinser@decus.de, for making the necessary changes for OpenVMS and for
+providing an appropriate build script.)  Build instructions can be found
+below.
+
+Files:
+
+   README             this file
+   LICENSE            terms of distribution and reuse (BSD-like or GNU GPL)
+   COPYING            GNU General Public License (GPL)
+
+   Makefile.unx       Unix makefile
+   Makefile.w32       Windows (MSVC) makefile
+   makevms.com        OpenVMS build script
+
+   rpng-win.c         Windows front end for the basic viewer
+   rpng-x.c           X Window System (Unix, OpenVMS) front end
+   readpng.c          generic back end for the basic viewer
+   readpng.h          header file for the basic viewer
+
+   rpng2-win.c        Windows front end for the progressive viewer
+   rpng2-x.c          X front end for the progressive viewer
+   readpng2.c         generic back end for the progressive viewer
+   readpng2.h         header file for the progressive viewer
+
+   wpng.c             generic (text) front end for the converter
+   writepng.c         generic back end for the converter
+   writepng.h         header file for the converter
+
+   toucan.png         transparent PNG for testing (by Stefan Schneider)
+
+Note that, although the programs are designed to be functional, their
+primary purpose is to illustrate how to use libpng to add PNG support to
+other programs.  As such, their user interfaces are crude and definitely
+are not intended for everyday use.
+
+Please see http://www.libpng.org/pub/png/pngbook.html for further infor-
+mation and links to the latest version of the source code, and Chapters
+13-15 of the book for detailed discussion of the three programs.
+
+Greg Roelofs
+http://pobox.com/~newt/greg_contact.html
+16 March 2008
+
+
+BUILD INSTRUCTIONS
+
+ - Prerequisites (in order of compilation):
+
+      - zlib            http://zlib.net/
+      - libpng          http://www.libpng.org/pub/png/libpng.html
+      - pngbook         http://www.libpng.org/pub/png/book/sources.html
+
+     The pngbook demo programs are explicitly designed to demonstrate proper
+     coding techniques for using the libpng reference library.  As a result,
+     you need to download and build both zlib (on which libpng depends) and
+     libpng.  A common build setup is to place the zlib, libpng and pngbook
+     subdirectory trees ("folders") in the same parent directory.  Then the
+     libpng build can refer to files in ../zlib (or ..\zlib or [-.zlib]),
+     and similarly for the pngbook build.
+
+     Note that all three packages are designed to be built from a command
+     line by default; those who wish to use a graphical or other integrated
+     development environments are on their own.
+
+
+ - Unix:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a directory and change into that directory.
+
+     Copy Makefile.unx to Makefile and edit the PNG* and Z* variables
+     appropriately (possibly also the X* variables if necessary).
+
+     make
+
+     There is no "install" target, so copy the three executables somewhere
+     in your path or run them from the current directory.  All three will
+     print a basic usage screen when run without any command-line arguments;
+     see the book for more details.
+
+
+ - Windows:
+
+     Unpack the latest pngbook sources (which should correspond to this
+     README file) into a folder, open a "DOS shell" or "command prompt"
+     or equivalent command-line window, and cd into the folder where you
+     unpacked the source code.
+
+     For MSVC, set up the necessary environment variables by invoking
+
+        %devstudio%\vc\bin\vcvars32.bat
+
+     where where %devstudio% is the installation directory for MSVC /
+     DevStudio.  If you get "environment out of space" errors under 95/98,
+     create a desktop shortcut with "c:\windows\command.com /e:4096" as
+     the program command line and set the working directory to the pngbook
+     directory.  Then double-click to open the new DOS-prompt window with
+     a bigger environment and retry the commands above.
+
+     Copy Makefile.w32 to Makefile and edit the PNGPATH and ZPATH variables
+     appropriately (possibly also the "INC" and "LIB" variables if needed).
+     Note that the names of the dynamic and static libpng and zlib libraries
+     used in the makefile may change in later releases of the libraries.
+     Also note that, as of libpng version 1.0.5, MSVC DLL builds do not work.
+     This makefile therefore builds statically linked executables, but if
+     the DLL problems ever get fixed, uncommenting the appropriate PNGLIB
+     and ZLIB lines will build dynamically linked executables instead.
+
+     Do the build by typing
+
+        nmake
+
+     The result should be three executables:  rpng-win.exe, rpng2-win.exe,
+     and wpng.exe.  Copy them somewhere in your PATH or run them from the
+     current folder.  Like the Unix versions, the two windowed programs
+     (rpng and rpng2) now display a usage screen in a console window when
+     invoked without command-line arguments; this is new behavior as of
+     the June 2001 release.  Note that the programs use the Unix-style "-"
+     character to specify options, instead of the more common DOS/Windows
+     "/" character.  (For example:  "rpng2-win -bgpat 4 foo.png", not
+     "rpng2-win /bgpat 4 foo.png")
+
+
+ - OpenVMS:
+
+     Unpack the pngbook sources into a subdirectory and change into that
+     subdirectory.
+
+     Edit makevms.com appropriately, specifically the zpath and pngpath
+     variables.
+
+     @makevms
+
+     To run the programs, they probably first need to be set up as "foreign
+     symbols," with "disk" and "dir" set appropriately:
+
+     $ rpng  == "$disk:[dir]rpng-x.exe"
+     $ rpng2 == "$disk:[dir]rpng2-x.exe"
+     $ wpng  == "$disk:[dir]wpng.exe"
+
+     All three will print a basic usage screen when run without any command-
+     line arguments; see the book for more details.  Note that the options
+     style is Unix-like, i.e., preceded by "-" rather than "/".
+
+
+RUNNING THE PROGRAMS:  (VERY) BRIEF INTRO
+
+     rpng is a simple PNG viewer that can display transparent PNGs with a
+     specified background color; for example,
+
+        rpng -bgcolor \#ff0000 toucan.png
+
+     would display the image with a red background.  rpng2 is a progressive
+     viewer that simulates a web browser in some respects; it can display
+     images against either a background color or a dynamically generated
+     background image.  For example:
+
+        rpng2 -bgpat 16 toucan.png
+
+     wpng is a purely command-line image converter from binary PBMPLUS/NetPBM
+     format (.pgm or .ppm) to PNG; for example,
+
+        wpng -time < toucan-notrans.ppm > toucan-notrans.png
+
+     would convert the specified PPM file (using redirection) to PNG, auto-
+     matically setting the PNG modification-time chunk.
+
+     All options can be abbreviated to the shortest unique value; for example,
+     "-bgc" for -bgcolor (versus "-bgp" for -bgpat), or "-g" for -gamma.
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/makevms.com b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/makevms.com
index 29a5727..f32bcab 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/makevms.com
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/makevms.com
@@ -1,132 +1,132 @@
-$!------------------------------------------------------------------------------

-$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS

-$!

-$! Script created by Martin Zinser for libpng; modified by Greg Roelofs

-$! for standalone pngbook source distribution.

-$!

-$!

-$!    Set locations where zlib and libpng sources live.

-$!

-$ zpath   = ""

-$ pngpath = ""

-$!

-$ if f$search("[---.zlib]zlib.h").nes."" then zpath = "[---.zlib]"

-$ if f$search("[--]png.h").nes."" then pngpath = "[--]"

-$!

-$ if f$search("[-.zlib]zlib.h").nes."" then zpath = "[-.zlib]"

-$ if f$search("[-.libpng]png.h").nes."" then pngpath = "[-.libpng]"

-$!

-$ if zpath .eqs. ""

-$ then

-$   write sys$output "zlib include not found. Exiting..."

-$   exit 2

-$ endif

-$!

-$ if pngpath .eqs. ""

-$ then

-$   write sys$output "libpng include not found. Exiting..."

-$   exit 2

-$ endif

-$!

-$!    Look for the compiler used.

-$!

-$ ccopt="/include=(''zpath',''pngpath')"

-$ if f$getsyi("HW_MODEL").ge.1024

-$ then

-$  ccopt = "/prefix=all"+ccopt

-$  comp  = "__decc__=1"

-$  if f$trnlnm("SYS").eqs."" then define sys sys$library:

-$ else

-$  if f$search("SYS$SYSTEM:DECC$COMPILER.EXE").eqs.""

-$   then

-$    if f$trnlnm("SYS").eqs."" then define sys sys$library:

-$    if f$search("SYS$SYSTEM:VAXC.EXE").eqs.""

-$     then

-$      comp  = "__gcc__=1"

-$      CC :== GCC

-$     else

-$      comp = "__vaxc__=1"

-$     endif

-$   else

-$    if f$trnlnm("SYS").eqs."" then define sys decc$library_include:

-$    ccopt = "/decc/prefix=all"+ccopt

-$    comp  = "__decc__=1"

-$  endif

-$ endif

-$ open/write lopt lib.opt

-$ write lopt "''pngpath'libpng.olb/lib"

-$ write lopt "''zpath'libz.olb/lib"

-$ close lopt

-$ open/write xopt x11.opt

-$ write xopt "sys$library:decw$xlibshr.exe/share"

-$ close xopt

-$!

-$!    Build 'em.

-$!

-$ write sys$output "Compiling PNG book programs ..."

-$   CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -

-        readpng.c readpng.h

-$   CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -

-        readpng2.c readpng2.h

-$   CALL MAKE writepng.OBJ "cc ''CCOPT' writepng" -

-        writepng.c writepng.h

-$   write sys$output "Building rpng-x..."

-$   CALL MAKE rpng-x.OBJ "cc ''CCOPT' rpng-x" -

-        rpng-x.c readpng.h

-$   call make rpng-x.exe -

-        "LINK rpng-x,readpng,lib.opt/opt,x11.opt/opt" -

-        rpng-x.obj readpng.obj

-$   write sys$output "Building rpng2-x..."

-$   CALL MAKE rpng2-x.OBJ "cc ''CCOPT' rpng2-x" -

-        rpng2-x.c readpng2.h

-$   call make rpng2-x.exe -

-        "LINK rpng2-x,readpng2,lib.opt/opt,x11.opt/opt" -

-        rpng2-x.obj readpng2.obj

-$   write sys$output "Building wpng..."

-$   CALL MAKE wpng.OBJ "cc ''CCOPT' wpng" -

-        wpng.c writepng.h

-$   call make wpng.exe -

-        "LINK wpng,writepng,lib.opt/opt" -

-        wpng.obj writepng.obj

-$ exit

-$!

-$!

-$MAKE: SUBROUTINE   !SUBROUTINE TO CHECK DEPENDENCIES

-$ V = 'F$Verify(0)

-$! P1 = What we are trying to make

-$! P2 = Command to make it

-$! P3 - P8  What it depends on

-$

-$ If F$Search(P1) .Eqs. "" Then Goto Makeit

-$ Time = F$CvTime(F$File(P1,"RDT"))

-$arg=3

-$Loop:

-$       Argument = P'arg

-$       If Argument .Eqs. "" Then Goto Exit

-$       El=0

-$Loop2:

-$       File = F$Element(El," ",Argument)

-$       If File .Eqs. " " Then Goto Endl

-$       AFile = ""

-$Loop3:

-$       OFile = AFile

-$       AFile = F$Search(File)

-$       If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl

-$       If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit

-$       Goto Loop3

-$NextEL:

-$       El = El + 1

-$       Goto Loop2

-$EndL:

-$ arg=arg+1

-$ If arg .Le. 8 Then Goto Loop

-$ Goto Exit

-$

-$Makeit:

-$ VV=F$VERIFY(0)

-$ write sys$output P2

-$ 'P2

-$ VV='F$Verify(VV)

-$Exit:

-$ If V Then Set Verify

-$ENDSUBROUTINE

+$!------------------------------------------------------------------------------
+$! make "PNG: The Definitive Guide" demo programs (for X) under OpenVMS
+$!
+$! Script created by Martin Zinser for libpng; modified by Greg Roelofs
+$! for standalone pngbook source distribution.
+$!
+$!
+$!    Set locations where zlib and libpng sources live.
+$!
+$ zpath   = ""
+$ pngpath = ""
+$!
+$ if f$search("[---.zlib]zlib.h").nes."" then zpath = "[---.zlib]"
+$ if f$search("[--]png.h").nes."" then pngpath = "[--]"
+$!
+$ if f$search("[-.zlib]zlib.h").nes."" then zpath = "[-.zlib]"
+$ if f$search("[-.libpng]png.h").nes."" then pngpath = "[-.libpng]"
+$!
+$ if zpath .eqs. ""
+$ then
+$   write sys$output "zlib include not found. Exiting..."
+$   exit 2
+$ endif
+$!
+$ if pngpath .eqs. ""
+$ then
+$   write sys$output "libpng include not found. Exiting..."
+$   exit 2
+$ endif
+$!
+$!    Look for the compiler used.
+$!
+$ ccopt="/include=(''zpath',''pngpath')"
+$ if f$getsyi("HW_MODEL").ge.1024
+$ then
+$  ccopt = "/prefix=all"+ccopt
+$  comp  = "__decc__=1"
+$  if f$trnlnm("SYS").eqs."" then define sys sys$library:
+$ else
+$  if f$search("SYS$SYSTEM:DECC$COMPILER.EXE").eqs.""
+$   then
+$    if f$trnlnm("SYS").eqs."" then define sys sys$library:
+$    if f$search("SYS$SYSTEM:VAXC.EXE").eqs.""
+$     then
+$      comp  = "__gcc__=1"
+$      CC :== GCC
+$     else
+$      comp = "__vaxc__=1"
+$     endif
+$   else
+$    if f$trnlnm("SYS").eqs."" then define sys decc$library_include:
+$    ccopt = "/decc/prefix=all"+ccopt
+$    comp  = "__decc__=1"
+$  endif
+$ endif
+$ open/write lopt lib.opt
+$ write lopt "''pngpath'libpng.olb/lib"
+$ write lopt "''zpath'libz.olb/lib"
+$ close lopt
+$ open/write xopt x11.opt
+$ write xopt "sys$library:decw$xlibshr.exe/share"
+$ close xopt
+$!
+$!    Build 'em.
+$!
+$ write sys$output "Compiling PNG book programs ..."
+$   CALL MAKE readpng.OBJ "cc ''CCOPT' readpng" -
+        readpng.c readpng.h
+$   CALL MAKE readpng2.OBJ "cc ''CCOPT' readpng2" -
+        readpng2.c readpng2.h
+$   CALL MAKE writepng.OBJ "cc ''CCOPT' writepng" -
+        writepng.c writepng.h
+$   write sys$output "Building rpng-x..."
+$   CALL MAKE rpng-x.OBJ "cc ''CCOPT' rpng-x" -
+        rpng-x.c readpng.h
+$   call make rpng-x.exe -
+        "LINK rpng-x,readpng,lib.opt/opt,x11.opt/opt" -
+        rpng-x.obj readpng.obj
+$   write sys$output "Building rpng2-x..."
+$   CALL MAKE rpng2-x.OBJ "cc ''CCOPT' rpng2-x" -
+        rpng2-x.c readpng2.h
+$   call make rpng2-x.exe -
+        "LINK rpng2-x,readpng2,lib.opt/opt,x11.opt/opt" -
+        rpng2-x.obj readpng2.obj
+$   write sys$output "Building wpng..."
+$   CALL MAKE wpng.OBJ "cc ''CCOPT' wpng" -
+        wpng.c writepng.h
+$   call make wpng.exe -
+        "LINK wpng,writepng,lib.opt/opt" -
+        wpng.obj writepng.obj
+$ exit
+$!
+$!
+$MAKE: SUBROUTINE   !SUBROUTINE TO CHECK DEPENDENCIES
+$ V = 'F$Verify(0)
+$! P1 = What we are trying to make
+$! P2 = Command to make it
+$! P3 - P8  What it depends on
+$
+$ If F$Search(P1) .Eqs. "" Then Goto Makeit
+$ Time = F$CvTime(F$File(P1,"RDT"))
+$arg=3
+$Loop:
+$       Argument = P'arg
+$       If Argument .Eqs. "" Then Goto Exit
+$       El=0
+$Loop2:
+$       File = F$Element(El," ",Argument)
+$       If File .Eqs. " " Then Goto Endl
+$       AFile = ""
+$Loop3:
+$       OFile = AFile
+$       AFile = F$Search(File)
+$       If AFile .Eqs. "" .Or. AFile .Eqs. OFile Then Goto NextEl
+$       If F$CvTime(F$File(AFile,"RDT")) .Ges. Time Then Goto Makeit
+$       Goto Loop3
+$NextEL:
+$       El = El + 1
+$       Goto Loop2
+$EndL:
+$ arg=arg+1
+$ If arg .Le. 8 Then Goto Loop
+$ Goto Exit
+$
+$Makeit:
+$ VV=F$VERIFY(0)
+$ write sys$output P2
+$ 'P2
+$ VV='F$Verify(VV)
+$Exit:
+$ If V Then Set Verify
+$ENDSUBROUTINE
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.c
index 27a2f11..df42c30 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.c
@@ -1,311 +1,311 @@
-/*---------------------------------------------------------------------------

-

-   rpng - simple PNG display program                              readpng.c

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#include <stdio.h>

-#include <stdlib.h>

-

-#include "png.h"        /* libpng header; includes zlib.h */

-#include "readpng.h"    /* typedefs, common macros, public prototypes */

-

-/* future versions of libpng will provide this macro: */

-#ifndef png_jmpbuf

-#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)

-#endif

-

-

-static png_structp png_ptr = NULL;

-static png_infop info_ptr = NULL;

-

-png_uint_32  width, height;

-int  bit_depth, color_type;

-uch  *image_data = NULL;

-

-

-void readpng_version_info(void)

-{

-    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",

-      PNG_LIBPNG_VER_STRING, png_libpng_ver);

-    fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",

-      ZLIB_VERSION, zlib_version);

-}

-

-

-/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */

-

-int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)

-{

-    uch sig[8];

-

-

-    /* first do a quick check that the file really is a PNG image; could

-     * have used slightly more general png_sig_cmp() function instead */

-

-    fread(sig, 1, 8, infile);

-    if (png_sig_cmp(sig, 0, 8))

-        return 1;   /* bad signature */

-

-

-    /* could pass pointers to user-defined error handlers instead of NULLs: */

-

-    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

-    if (!png_ptr)

-        return 4;   /* out of memory */

-

-    info_ptr = png_create_info_struct(png_ptr);

-    if (!info_ptr) {

-        png_destroy_read_struct(&png_ptr, NULL, NULL);

-        return 4;   /* out of memory */

-    }

-

-

-    /* we could create a second info struct here (end_info), but it's only

-     * useful if we want to keep pre- and post-IDAT chunk info separated

-     * (mainly for PNG-aware image editors and converters) */

-

-

-    /* setjmp() must be called in every function that calls a PNG-reading

-     * libpng function */

-

-    if (setjmp(png_jmpbuf(png_ptr))) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        return 2;

-    }

-

-

-    png_init_io(png_ptr, infile);

-    png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */

-

-    png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */

-

-

-    /* alternatively, could make separate calls to png_get_image_width(),

-     * etc., but want bit_depth and color_type for later [don't care about

-     * compression_type and filter_type => NULLs] */

-

-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,

-      NULL, NULL, NULL);

-    *pWidth = width;

-    *pHeight = height;

-

-

-    /* OK, that's all we need for now; return happy */

-

-    return 0;

-}

-

-

-

-

-/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;

- * scales values to 8-bit if necessary */

-

-int readpng_get_bgcolor(uch *red, uch *green, uch *blue)

-{

-    png_color_16p pBackground;

-

-

-    /* setjmp() must be called in every function that calls a PNG-reading

-     * libpng function */

-

-    if (setjmp(png_jmpbuf(png_ptr))) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        return 2;

-    }

-

-

-    if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))

-        return 1;

-

-    /* it is not obvious from the libpng documentation, but this function

-     * takes a pointer to a pointer, and it always returns valid red, green

-     * and blue values, regardless of color_type: */

-

-    png_get_bKGD(png_ptr, info_ptr, &pBackground);

-

-

-    /* however, it always returns the raw bKGD data, regardless of any

-     * bit-depth transformations, so check depth and adjust if necessary */

-

-    if (bit_depth == 16) {

-        *red   = pBackground->red   >> 8;

-        *green = pBackground->green >> 8;

-        *blue  = pBackground->blue  >> 8;

-    } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {

-        if (bit_depth == 1)

-            *red = *green = *blue = pBackground->gray? 255 : 0;

-        else if (bit_depth == 2)

-            *red = *green = *blue = (255/3) * pBackground->gray;

-        else /* bit_depth == 4 */

-            *red = *green = *blue = (255/15) * pBackground->gray;

-    } else {

-        *red   = (uch)pBackground->red;

-        *green = (uch)pBackground->green;

-        *blue  = (uch)pBackground->blue;

-    }

-

-    return 0;

-}

-

-

-

-

-/* display_exponent == LUT_exponent * CRT_exponent */

-

-uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)

-{

-    double  gamma;

-    png_uint_32  i, rowbytes;

-    png_bytepp  row_pointers = NULL;

-

-

-    /* setjmp() must be called in every function that calls a PNG-reading

-     * libpng function */

-

-    if (setjmp(png_jmpbuf(png_ptr))) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        return NULL;

-    }

-

-

-    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,

-     * transparency chunks to full alpha channel; strip 16-bit-per-sample

-     * images to 8 bits per sample; and convert grayscale to RGB[A] */

-

-    if (color_type == PNG_COLOR_TYPE_PALETTE)

-        png_set_expand(png_ptr);

-    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)

-        png_set_expand(png_ptr);

-    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))

-        png_set_expand(png_ptr);

-#ifdef PNG_READ_16_TO_8_SUPPORTED

-    if (bit_depth == 16)

-#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED

-        png_set_scale_16(png_ptr);

-#  else

-        png_set_strip_16(png_ptr);

-#  endif

-#endif

-    if (color_type == PNG_COLOR_TYPE_GRAY ||

-        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)

-        png_set_gray_to_rgb(png_ptr);

-

-

-    /* unlike the example in the libpng documentation, we have *no* idea where

-     * this file may have come from--so if it doesn't have a file gamma, don't

-     * do any correction ("do no harm") */

-

-    if (png_get_gAMA(png_ptr, info_ptr, &gamma))

-        png_set_gamma(png_ptr, display_exponent, gamma);

-

-

-    /* all transformations have been registered; now update info_ptr data,

-     * get rowbytes and channels, and allocate image memory */

-

-    png_read_update_info(png_ptr, info_ptr);

-

-    *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);

-    *pChannels = (int)png_get_channels(png_ptr, info_ptr);

-

-    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        return NULL;

-    }

-    if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        free(image_data);

-        image_data = NULL;

-        return NULL;

-    }

-

-    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n",

-        *pChannels, rowbytes, height));

-

-

-    /* set the individual row_pointers to point at the correct offsets */

-

-    for (i = 0;  i < height;  ++i)

-        row_pointers[i] = image_data + i*rowbytes;

-

-

-    /* now we can go ahead and just read the whole image */

-

-    png_read_image(png_ptr, row_pointers);

-

-

-    /* and we're done!  (png_read_end() can be omitted if no processing of

-     * post-IDAT text/time/etc. is desired) */

-

-    free(row_pointers);

-    row_pointers = NULL;

-

-    png_read_end(png_ptr, NULL);

-

-    return image_data;

-}

-

-

-void readpng_cleanup(int free_image_data)

-{

-    if (free_image_data && image_data) {

-        free(image_data);

-        image_data = NULL;

-    }

-

-    if (png_ptr && info_ptr) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        png_ptr = NULL;

-        info_ptr = NULL;

-    }

-}

+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                              readpng.c
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "png.h"        /* libpng header; includes zlib.h */
+#include "readpng.h"    /* typedefs, common macros, public prototypes */
+
+/* future versions of libpng will provide this macro: */
+#ifndef png_jmpbuf
+#  define png_jmpbuf(png_ptr)   ((png_ptr)->jmpbuf)
+#endif
+
+
+static png_structp png_ptr = NULL;
+static png_infop info_ptr = NULL;
+
+png_uint_32  width, height;
+int  bit_depth, color_type;
+uch  *image_data = NULL;
+
+
+void readpng_version_info(void)
+{
+    fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
+      PNG_LIBPNG_VER_STRING, png_libpng_ver);
+    fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
+      ZLIB_VERSION, zlib_version);
+}
+
+
+/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
+
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
+{
+    uch sig[8];
+
+
+    /* first do a quick check that the file really is a PNG image; could
+     * have used slightly more general png_sig_cmp() function instead */
+
+    fread(sig, 1, 8, infile);
+    if (png_sig_cmp(sig, 0, 8))
+        return 1;   /* bad signature */
+
+
+    /* could pass pointers to user-defined error handlers instead of NULLs: */
+
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+    if (!png_ptr)
+        return 4;   /* out of memory */
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr) {
+        png_destroy_read_struct(&png_ptr, NULL, NULL);
+        return 4;   /* out of memory */
+    }
+
+
+    /* we could create a second info struct here (end_info), but it's only
+     * useful if we want to keep pre- and post-IDAT chunk info separated
+     * (mainly for PNG-aware image editors and converters) */
+
+
+    /* setjmp() must be called in every function that calls a PNG-reading
+     * libpng function */
+
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        return 2;
+    }
+
+
+    png_init_io(png_ptr, infile);
+    png_set_sig_bytes(png_ptr, 8);  /* we already read the 8 signature bytes */
+
+    png_read_info(png_ptr, info_ptr);  /* read all PNG info up to image data */
+
+
+    /* alternatively, could make separate calls to png_get_image_width(),
+     * etc., but want bit_depth and color_type for later [don't care about
+     * compression_type and filter_type => NULLs] */
+
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
+      NULL, NULL, NULL);
+    *pWidth = width;
+    *pHeight = height;
+
+
+    /* OK, that's all we need for now; return happy */
+
+    return 0;
+}
+
+
+
+
+/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
+ * scales values to 8-bit if necessary */
+
+int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
+{
+    png_color_16p pBackground;
+
+
+    /* setjmp() must be called in every function that calls a PNG-reading
+     * libpng function */
+
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        return 2;
+    }
+
+
+    if (!png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
+        return 1;
+
+    /* it is not obvious from the libpng documentation, but this function
+     * takes a pointer to a pointer, and it always returns valid red, green
+     * and blue values, regardless of color_type: */
+
+    png_get_bKGD(png_ptr, info_ptr, &pBackground);
+
+
+    /* however, it always returns the raw bKGD data, regardless of any
+     * bit-depth transformations, so check depth and adjust if necessary */
+
+    if (bit_depth == 16) {
+        *red   = pBackground->red   >> 8;
+        *green = pBackground->green >> 8;
+        *blue  = pBackground->blue  >> 8;
+    } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
+        if (bit_depth == 1)
+            *red = *green = *blue = pBackground->gray? 255 : 0;
+        else if (bit_depth == 2)
+            *red = *green = *blue = (255/3) * pBackground->gray;
+        else /* bit_depth == 4 */
+            *red = *green = *blue = (255/15) * pBackground->gray;
+    } else {
+        *red   = (uch)pBackground->red;
+        *green = (uch)pBackground->green;
+        *blue  = (uch)pBackground->blue;
+    }
+
+    return 0;
+}
+
+
+
+
+/* display_exponent == LUT_exponent * CRT_exponent */
+
+uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
+{
+    double  gamma;
+    png_uint_32  i, rowbytes;
+    png_bytepp  row_pointers = NULL;
+
+
+    /* setjmp() must be called in every function that calls a PNG-reading
+     * libpng function */
+
+    if (setjmp(png_jmpbuf(png_ptr))) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        return NULL;
+    }
+
+
+    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
+     * transparency chunks to full alpha channel; strip 16-bit-per-sample
+     * images to 8 bits per sample; and convert grayscale to RGB[A] */
+
+    if (color_type == PNG_COLOR_TYPE_PALETTE)
+        png_set_expand(png_ptr);
+    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+        png_set_expand(png_ptr);
+    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+        png_set_expand(png_ptr);
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+    if (bit_depth == 16)
+#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+        png_set_scale_16(png_ptr);
+#  else
+        png_set_strip_16(png_ptr);
+#  endif
+#endif
+    if (color_type == PNG_COLOR_TYPE_GRAY ||
+        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+        png_set_gray_to_rgb(png_ptr);
+
+
+    /* unlike the example in the libpng documentation, we have *no* idea where
+     * this file may have come from--so if it doesn't have a file gamma, don't
+     * do any correction ("do no harm") */
+
+    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
+        png_set_gamma(png_ptr, display_exponent, gamma);
+
+
+    /* all transformations have been registered; now update info_ptr data,
+     * get rowbytes and channels, and allocate image memory */
+
+    png_read_update_info(png_ptr, info_ptr);
+
+    *pRowbytes = rowbytes = png_get_rowbytes(png_ptr, info_ptr);
+    *pChannels = (int)png_get_channels(png_ptr, info_ptr);
+
+    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        return NULL;
+    }
+    if ((row_pointers = (png_bytepp)malloc(height*sizeof(png_bytep))) == NULL) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        free(image_data);
+        image_data = NULL;
+        return NULL;
+    }
+
+    Trace((stderr, "readpng_get_image:  channels = %d, rowbytes = %ld, height = %ld\n",
+        *pChannels, rowbytes, height));
+
+
+    /* set the individual row_pointers to point at the correct offsets */
+
+    for (i = 0;  i < height;  ++i)
+        row_pointers[i] = image_data + i*rowbytes;
+
+
+    /* now we can go ahead and just read the whole image */
+
+    png_read_image(png_ptr, row_pointers);
+
+
+    /* and we're done!  (png_read_end() can be omitted if no processing of
+     * post-IDAT text/time/etc. is desired) */
+
+    free(row_pointers);
+    row_pointers = NULL;
+
+    png_read_end(png_ptr, NULL);
+
+    return image_data;
+}
+
+
+void readpng_cleanup(int free_image_data)
+{
+    if (free_image_data && image_data) {
+        free(image_data);
+        image_data = NULL;
+    }
+
+    if (png_ptr && info_ptr) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        png_ptr = NULL;
+        info_ptr = NULL;
+    }
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.h b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.h
index ec6b483..fad9fe3 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.h
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng.h
@@ -1,88 +1,88 @@
-/*---------------------------------------------------------------------------

-

-   rpng - simple PNG display program                              readpng.h

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#ifndef TRUE

-#  define TRUE 1

-#  define FALSE 0

-#endif

-

-#ifndef MAX

-#  define MAX(a,b)  ((a) > (b)? (a) : (b))

-#  define MIN(a,b)  ((a) < (b)? (a) : (b))

-#endif

-

-#ifdef DEBUG

-#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}

-#else

-#  define Trace(x)  ;

-#endif

-

-typedef unsigned char   uch;

-typedef unsigned short  ush;

-typedef unsigned long   ulg;

-

-

-/* prototypes for public functions in readpng.c */

-

-void readpng_version_info(void);

-

-int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);

-

-int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);

-

-uch *readpng_get_image(double display_exponent, int *pChannels,

-                       ulg *pRowbytes);

-

-void readpng_cleanup(int free_image_data);

+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                              readpng.h
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#ifndef TRUE
+#  define TRUE 1
+#  define FALSE 0
+#endif
+
+#ifndef MAX
+#  define MAX(a,b)  ((a) > (b)? (a) : (b))
+#  define MIN(a,b)  ((a) < (b)? (a) : (b))
+#endif
+
+#ifdef DEBUG
+#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
+#else
+#  define Trace(x)  ;
+#endif
+
+typedef unsigned char   uch;
+typedef unsigned short  ush;
+typedef unsigned long   ulg;
+
+
+/* prototypes for public functions in readpng.c */
+
+void readpng_version_info(void);
+
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
+
+int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
+
+uch *readpng_get_image(double display_exponent, int *pChannels,
+                       ulg *pRowbytes);
+
+void readpng_cleanup(int free_image_data);
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.c
index 3bbd2ec..b9746b7 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.c
@@ -1,511 +1,511 @@
-/*---------------------------------------------------------------------------

-

-   rpng2 - progressive-model PNG display program                 readpng2.c

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-

-#include <stdlib.h>     /* for exit() prototype */

-#include <setjmp.h>

-

-#include <zlib.h>

-#include "png.h"        /* libpng header from the local directory */

-#include "readpng2.h"   /* typedefs, common macros, public prototypes */

-

-

-/* local prototypes */

-

-static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr);

-static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,

-                                 png_uint_32 row_num, int pass);

-static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);

-static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);

-

-

-

-

-void readpng2_version_info(void)

-{

-    fprintf(stderr, "   Compiled with libpng %s; using libpng %s\n",

-      PNG_LIBPNG_VER_STRING, png_libpng_ver);

-

-    fprintf(stderr, "   and with zlib %s; using zlib %s.\n",

-      ZLIB_VERSION, zlib_version);

-}

-

-

-

-

-int readpng2_check_sig(uch *sig, int num)

-{

-    return !png_sig_cmp(sig, 0, num);

-}

-

-

-

-

-/* returns 0 for success, 2 for libpng problem, 4 for out of memory */

-

-int readpng2_init(mainprog_info *mainprog_ptr)

-{

-    png_structp  png_ptr;       /* note:  temporary variables! */

-    png_infop  info_ptr;

-

-

-    /* could also replace libpng warning-handler (final NULL), but no need: */

-

-    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,

-      readpng2_error_handler, NULL);

-    if (!png_ptr)

-        return 4;   /* out of memory */

-

-    info_ptr = png_create_info_struct(png_ptr);

-    if (!info_ptr) {

-        png_destroy_read_struct(&png_ptr, NULL, NULL);

-        return 4;   /* out of memory */

-    }

-

-

-    /* we could create a second info struct here (end_info), but it's only

-     * useful if we want to keep pre- and post-IDAT chunk info separated

-     * (mainly for PNG-aware image editors and converters) */

-

-

-    /* setjmp() must be called in every function that calls a PNG-reading

-     * libpng function, unless an alternate error handler was installed--

-     * but compatible error handlers must either use longjmp() themselves

-     * (as in this program) or exit immediately, so here we are: */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        return 2;

-    }

-

-

-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED

-    /* prepare the reader to ignore all recognized chunks whose data won't be

-     * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,

-     * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */

-    {

-        /* These byte strings were copied from png.h.  If a future libpng

-         * version recognizes more chunks, add them to this list.  If a

-         * future version of readpng2.c recognizes more chunks, delete them

-         * from this list. */

-        static /* const */ png_byte chunks_to_ignore[] = {

-             99,  72,  82,  77, '\0',  /* cHRM */

-            104,  73,  83,  84, '\0',  /* hIST */

-            105,  67,  67,  80, '\0',  /* iCCP */

-            105,  84,  88, 116, '\0',  /* iTXt */

-            111,  70,  70, 115, '\0',  /* oFFs */

-            112,  67,  65,  76, '\0',  /* pCAL */

-            112,  72,  89, 115, '\0',  /* pHYs */

-            115,  66,  73,  84, '\0',  /* sBIT */

-            115,  67,  65,  76, '\0',  /* sCAL */

-            115,  80,  76,  84, '\0',  /* sPLT */

-            115,  84,  69,  82, '\0',  /* sTER */

-            116,  69,  88, 116, '\0',  /* tEXt */

-            116,  73,  77,  69, '\0',  /* tIME */

-            122,  84,  88, 116, '\0'   /* zTXt */

-        };

-

-        png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,

-          chunks_to_ignore, sizeof(chunks_to_ignore)/5);

-    }

-#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */

-

-

-    /* instead of doing png_init_io() here, now we set up our callback

-     * functions for progressive decoding */

-

-    png_set_progressive_read_fn(png_ptr, mainprog_ptr,

-      readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);

-

-

-    /* make sure we save our pointers for use in readpng2_decode_data() */

-

-    mainprog_ptr->png_ptr = png_ptr;

-    mainprog_ptr->info_ptr = info_ptr;

-

-

-    /* and that's all there is to initialization */

-

-    return 0;

-}

-

-

-

-

-/* returns 0 for success, 2 for libpng (longjmp) problem */

-

-int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length)

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-

-    /* setjmp() must be called in every function that calls a PNG-reading

-     * libpng function */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-        mainprog_ptr->png_ptr = NULL;

-        mainprog_ptr->info_ptr = NULL;

-        return 2;

-    }

-

-

-    /* hand off the next chunk of input data to libpng for decoding */

-

-    png_process_data(png_ptr, info_ptr, rawbuf, length);

-

-    return 0;

-}

-

-

-

-

-static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)

-{

-    mainprog_info  *mainprog_ptr;

-    int  color_type, bit_depth;

-    png_uint_32 width, height;

-#ifdef PNG_FLOATING_POINT_SUPPORTED

-    double  gamma;

-#else

-    png_fixed_point gamma;

-#endif

-

-

-    /* setjmp() doesn't make sense here, because we'd either have to exit(),

-     * longjmp() ourselves, or return control to libpng, which doesn't want

-     * to see us again.  By not doing anything here, libpng will instead jump

-     * to readpng2_decode_data(), which can return an error value to the main

-     * program. */

-

-

-    /* retrieve the pointer to our special-purpose struct, using the png_ptr

-     * that libpng passed back to us (i.e., not a global this time--there's

-     * no real difference for a single image, but for a multithreaded browser

-     * decoding several PNG images at the same time, one needs to avoid mixing

-     * up different images' structs) */

-

-    mainprog_ptr = png_get_progressive_ptr(png_ptr);

-

-    if (mainprog_ptr == NULL) {         /* we be hosed */

-        fprintf(stderr,

-          "readpng2 error:  main struct not recoverable in info_callback.\n");

-        fflush(stderr);

-        return;

-        /*

-         * Alternatively, we could call our error-handler just like libpng

-         * does, which would effectively terminate the program.  Since this

-         * can only happen if png_ptr gets redirected somewhere odd or the

-         * main PNG struct gets wiped, we're probably toast anyway.  (If

-         * png_ptr itself is NULL, we would not have been called.)

-         */

-    }

-

-

-    /* this is just like in the non-progressive case */

-

-    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,

-       NULL, NULL, NULL);

-    mainprog_ptr->width = (ulg)width;

-    mainprog_ptr->height = (ulg)height;

-

-

-    /* since we know we've read all of the PNG file's "header" (i.e., up

-     * to IDAT), we can check for a background color here */

-

-    if (mainprog_ptr->need_bgcolor &&

-        png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))

-    {

-        png_color_16p pBackground;

-

-        /* it is not obvious from the libpng documentation, but this function

-         * takes a pointer to a pointer, and it always returns valid red,

-         * green and blue values, regardless of color_type: */

-        png_get_bKGD(png_ptr, info_ptr, &pBackground);

-

-        /* however, it always returns the raw bKGD data, regardless of any

-         * bit-depth transformations, so check depth and adjust if necessary */

-        if (bit_depth == 16) {

-            mainprog_ptr->bg_red   = pBackground->red   >> 8;

-            mainprog_ptr->bg_green = pBackground->green >> 8;

-            mainprog_ptr->bg_blue  = pBackground->blue  >> 8;

-        } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {

-            if (bit_depth == 1)

-                mainprog_ptr->bg_red = mainprog_ptr->bg_green =

-                  mainprog_ptr->bg_blue = pBackground->gray? 255 : 0;

-            else if (bit_depth == 2)

-                mainprog_ptr->bg_red = mainprog_ptr->bg_green =

-                  mainprog_ptr->bg_blue = (255/3) * pBackground->gray;

-            else /* bit_depth == 4 */

-                mainprog_ptr->bg_red = mainprog_ptr->bg_green =

-                  mainprog_ptr->bg_blue = (255/15) * pBackground->gray;

-        } else {

-            mainprog_ptr->bg_red   = (uch)pBackground->red;

-            mainprog_ptr->bg_green = (uch)pBackground->green;

-            mainprog_ptr->bg_blue  = (uch)pBackground->blue;

-        }

-    }

-

-

-    /* as before, let libpng expand palette images to RGB, low-bit-depth

-     * grayscale images to 8 bits, transparency chunks to full alpha channel;

-     * strip 16-bit-per-sample images to 8 bits per sample; and convert

-     * grayscale to RGB[A] */

-

-    if (color_type == PNG_COLOR_TYPE_PALETTE)

-        png_set_expand(png_ptr);

-    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)

-        png_set_expand(png_ptr);

-    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))

-        png_set_expand(png_ptr);

-#ifdef PNG_READ_16_TO_8_SUPPORTED

-    if (bit_depth == 16)

-#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED

-        png_set_scale_16(png_ptr);

-#  else

-        png_set_strip_16(png_ptr);

-#  endif

-#endif

-    if (color_type == PNG_COLOR_TYPE_GRAY ||

-        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)

-        png_set_gray_to_rgb(png_ptr);

-

-

-    /* Unlike the basic viewer, which was designed to operate on local files,

-     * this program is intended to simulate a web browser--even though we

-     * actually read from a local file, too.  But because we are pretending

-     * that most of the images originate on the Internet, we follow the recom-

-     * mendation of the sRGB proposal and treat unlabelled images (no gAMA

-     * chunk) as existing in the sRGB color space.  That is, we assume that

-     * such images have a file gamma of 0.45455, which corresponds to a PC-like

-     * display system.  This change in assumptions will have no effect on a

-     * PC-like system, but on a Mac, SGI, NeXT or other system with a non-

-     * identity lookup table, it will darken unlabelled images, which effec-

-     * tively favors images from PC-like systems over those originating on

-     * the local platform.  Note that mainprog_ptr->display_exponent is the

-     * "gamma" value for the entire display system, i.e., the product of

-     * LUT_exponent and CRT_exponent. */

-

-#ifdef PNG_FLOATING_POINT_SUPPORTED

-    if (png_get_gAMA(png_ptr, info_ptr, &gamma))

-        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);

-    else

-        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);

-#else

-    if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))

-        png_set_gamma_fixed(png_ptr,

-            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);

-    else

-        png_set_gamma_fixed(png_ptr,

-            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);

-#endif

-

-    /* we'll let libpng expand interlaced images, too */

-

-    mainprog_ptr->passes = png_set_interlace_handling(png_ptr);

-

-

-    /* all transformations have been registered; now update info_ptr data and

-     * then get rowbytes and channels */

-

-    png_read_update_info(png_ptr, info_ptr);

-

-    mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);

-    mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);

-

-

-    /* Call the main program to allocate memory for the image buffer and

-     * initialize windows and whatnot.  (The old-style function-pointer

-     * invocation is used for compatibility with a few supposedly ANSI

-     * compilers that nevertheless barf on "fn_ptr()"-style syntax.) */

-

-    (*mainprog_ptr->mainprog_init)();

-

-

-    /* and that takes care of initialization */

-

-    return;

-}

-

-

-

-

-

-static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,

-                                  png_uint_32 row_num, int pass)

-{

-    mainprog_info  *mainprog_ptr;

-

-

-    /* first check whether the row differs from the previous pass; if not,

-     * nothing to combine or display */

-

-    if (!new_row)

-        return;

-

-

-    /* retrieve the pointer to our special-purpose struct so we can access

-     * the old rows and image-display callback function */

-

-    mainprog_ptr = png_get_progressive_ptr(png_ptr);

-

-

-    /* save the pass number for optional use by the front end */

-

-    mainprog_ptr->pass = pass;

-

-

-    /* have libpng either combine the new row data with the existing row data

-     * from previous passes (if interlaced) or else just copy the new row

-     * into the main program's image buffer */

-

-    png_progressive_combine_row(png_ptr, mainprog_ptr->row_pointers[row_num],

-      new_row);

-

-

-    /* finally, call the display routine in the main program with the number

-     * of the row we just updated */

-

-    (*mainprog_ptr->mainprog_display_row)(row_num);

-

-

-    /* and we're ready for more */

-

-    return;

-}

-

-

-

-

-

-static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr)

-{

-    mainprog_info  *mainprog_ptr;

-

-

-    /* retrieve the pointer to our special-purpose struct */

-

-    mainprog_ptr = png_get_progressive_ptr(png_ptr);

-

-

-    /* let the main program know that it should flush any buffered image

-     * data to the display now and set a "done" flag or whatever, but note

-     * that it SHOULD NOT DESTROY THE PNG STRUCTS YET--in other words, do

-     * NOT call readpng2_cleanup() either here or in the finish_display()

-     * routine; wait until control returns to the main program via

-     * readpng2_decode_data() */

-

-    (*mainprog_ptr->mainprog_finish_display)();

-

-

-    /* all done */

-

-    return;

-}

-

-

-

-

-

-void readpng2_cleanup(mainprog_info *mainprog_ptr)

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-    if (png_ptr && info_ptr)

-        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);

-

-    mainprog_ptr->png_ptr = NULL;

-    mainprog_ptr->info_ptr = NULL;

-}

-

-

-

-

-

-static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)

-{

-    mainprog_info  *mainprog_ptr;

-

-    /* This function, aside from the extra step of retrieving the "error

-     * pointer" (below) and the fact that it exists within the application

-     * rather than within libpng, is essentially identical to libpng's

-     * default error handler.  The second point is critical:  since both

-     * setjmp() and longjmp() are called from the same code, they are

-     * guaranteed to have compatible notions of how big a jmp_buf is,

-     * regardless of whether _BSD_SOURCE or anything else has (or has not)

-     * been defined. */

-

-    fprintf(stderr, "readpng2 libpng error: %s\n", msg);

-    fflush(stderr);

-

-    mainprog_ptr = png_get_error_ptr(png_ptr);

-    if (mainprog_ptr == NULL) {         /* we are completely hosed now */

-        fprintf(stderr,

-          "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");

-        fflush(stderr);

-        exit(99);

-    }

-

-    /* Now we have our data structure we can use the information in it

-     * to return control to our own higher level code (all the points

-     * where 'setjmp' is called in this file.)  This will work with other

-     * error handling mechanisms as well - libpng always calls png_error

-     * when it can proceed no further, thus, so long as the error handler

-     * is intercepted, application code can do its own error recovery.

-     */

-    longjmp(mainprog_ptr->jmpbuf, 1);

-}

+/*---------------------------------------------------------------------------
+
+   rpng2 - progressive-model PNG display program                 readpng2.c
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+
+#include <stdlib.h>     /* for exit() prototype */
+#include <setjmp.h>
+
+#include <zlib.h>
+#include "png.h"        /* libpng header from the local directory */
+#include "readpng2.h"   /* typedefs, common macros, public prototypes */
+
+
+/* local prototypes */
+
+static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr);
+static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
+                                 png_uint_32 row_num, int pass);
+static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr);
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg);
+
+
+
+
+void readpng2_version_info(void)
+{
+    fprintf(stderr, "   Compiled with libpng %s; using libpng %s\n",
+      PNG_LIBPNG_VER_STRING, png_libpng_ver);
+
+    fprintf(stderr, "   and with zlib %s; using zlib %s.\n",
+      ZLIB_VERSION, zlib_version);
+}
+
+
+
+
+int readpng2_check_sig(uch *sig, int num)
+{
+    return !png_sig_cmp(sig, 0, num);
+}
+
+
+
+
+/* returns 0 for success, 2 for libpng problem, 4 for out of memory */
+
+int readpng2_init(mainprog_info *mainprog_ptr)
+{
+    png_structp  png_ptr;       /* note:  temporary variables! */
+    png_infop  info_ptr;
+
+
+    /* could also replace libpng warning-handler (final NULL), but no need: */
+
+    png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
+      readpng2_error_handler, NULL);
+    if (!png_ptr)
+        return 4;   /* out of memory */
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr) {
+        png_destroy_read_struct(&png_ptr, NULL, NULL);
+        return 4;   /* out of memory */
+    }
+
+
+    /* we could create a second info struct here (end_info), but it's only
+     * useful if we want to keep pre- and post-IDAT chunk info separated
+     * (mainly for PNG-aware image editors and converters) */
+
+
+    /* setjmp() must be called in every function that calls a PNG-reading
+     * libpng function, unless an alternate error handler was installed--
+     * but compatible error handlers must either use longjmp() themselves
+     * (as in this program) or exit immediately, so here we are: */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        return 2;
+    }
+
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+    /* prepare the reader to ignore all recognized chunks whose data won't be
+     * used, i.e., all chunks recognized by libpng except for IHDR, PLTE, IDAT,
+     * IEND, tRNS, bKGD, gAMA, and sRGB (small performance improvement) */
+    {
+        /* These byte strings were copied from png.h.  If a future libpng
+         * version recognizes more chunks, add them to this list.  If a
+         * future version of readpng2.c recognizes more chunks, delete them
+         * from this list. */
+        static /* const */ png_byte chunks_to_ignore[] = {
+             99,  72,  82,  77, '\0',  /* cHRM */
+            104,  73,  83,  84, '\0',  /* hIST */
+            105,  67,  67,  80, '\0',  /* iCCP */
+            105,  84,  88, 116, '\0',  /* iTXt */
+            111,  70,  70, 115, '\0',  /* oFFs */
+            112,  67,  65,  76, '\0',  /* pCAL */
+            112,  72,  89, 115, '\0',  /* pHYs */
+            115,  66,  73,  84, '\0',  /* sBIT */
+            115,  67,  65,  76, '\0',  /* sCAL */
+            115,  80,  76,  84, '\0',  /* sPLT */
+            115,  84,  69,  82, '\0',  /* sTER */
+            116,  69,  88, 116, '\0',  /* tEXt */
+            116,  73,  77,  69, '\0',  /* tIME */
+            122,  84,  88, 116, '\0'   /* zTXt */
+        };
+
+        png_set_keep_unknown_chunks(png_ptr, 1 /* PNG_HANDLE_CHUNK_NEVER */,
+          chunks_to_ignore, sizeof(chunks_to_ignore)/5);
+    }
+#endif /* PNG_HANDLE_AS_UNKNOWN_SUPPORTED */
+
+
+    /* instead of doing png_init_io() here, now we set up our callback
+     * functions for progressive decoding */
+
+    png_set_progressive_read_fn(png_ptr, mainprog_ptr,
+      readpng2_info_callback, readpng2_row_callback, readpng2_end_callback);
+
+
+    /* make sure we save our pointers for use in readpng2_decode_data() */
+
+    mainprog_ptr->png_ptr = png_ptr;
+    mainprog_ptr->info_ptr = info_ptr;
+
+
+    /* and that's all there is to initialization */
+
+    return 0;
+}
+
+
+
+
+/* returns 0 for success, 2 for libpng (longjmp) problem */
+
+int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length)
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+
+    /* setjmp() must be called in every function that calls a PNG-reading
+     * libpng function */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+        mainprog_ptr->png_ptr = NULL;
+        mainprog_ptr->info_ptr = NULL;
+        return 2;
+    }
+
+
+    /* hand off the next chunk of input data to libpng for decoding */
+
+    png_process_data(png_ptr, info_ptr, rawbuf, length);
+
+    return 0;
+}
+
+
+
+
+static void readpng2_info_callback(png_structp png_ptr, png_infop info_ptr)
+{
+    mainprog_info  *mainprog_ptr;
+    int  color_type, bit_depth;
+    png_uint_32 width, height;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+    double  gamma;
+#else
+    png_fixed_point gamma;
+#endif
+
+
+    /* setjmp() doesn't make sense here, because we'd either have to exit(),
+     * longjmp() ourselves, or return control to libpng, which doesn't want
+     * to see us again.  By not doing anything here, libpng will instead jump
+     * to readpng2_decode_data(), which can return an error value to the main
+     * program. */
+
+
+    /* retrieve the pointer to our special-purpose struct, using the png_ptr
+     * that libpng passed back to us (i.e., not a global this time--there's
+     * no real difference for a single image, but for a multithreaded browser
+     * decoding several PNG images at the same time, one needs to avoid mixing
+     * up different images' structs) */
+
+    mainprog_ptr = png_get_progressive_ptr(png_ptr);
+
+    if (mainprog_ptr == NULL) {         /* we be hosed */
+        fprintf(stderr,
+          "readpng2 error:  main struct not recoverable in info_callback.\n");
+        fflush(stderr);
+        return;
+        /*
+         * Alternatively, we could call our error-handler just like libpng
+         * does, which would effectively terminate the program.  Since this
+         * can only happen if png_ptr gets redirected somewhere odd or the
+         * main PNG struct gets wiped, we're probably toast anyway.  (If
+         * png_ptr itself is NULL, we would not have been called.)
+         */
+    }
+
+
+    /* this is just like in the non-progressive case */
+
+    png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
+       NULL, NULL, NULL);
+    mainprog_ptr->width = (ulg)width;
+    mainprog_ptr->height = (ulg)height;
+
+
+    /* since we know we've read all of the PNG file's "header" (i.e., up
+     * to IDAT), we can check for a background color here */
+
+    if (mainprog_ptr->need_bgcolor &&
+        png_get_valid(png_ptr, info_ptr, PNG_INFO_bKGD))
+    {
+        png_color_16p pBackground;
+
+        /* it is not obvious from the libpng documentation, but this function
+         * takes a pointer to a pointer, and it always returns valid red,
+         * green and blue values, regardless of color_type: */
+        png_get_bKGD(png_ptr, info_ptr, &pBackground);
+
+        /* however, it always returns the raw bKGD data, regardless of any
+         * bit-depth transformations, so check depth and adjust if necessary */
+        if (bit_depth == 16) {
+            mainprog_ptr->bg_red   = pBackground->red   >> 8;
+            mainprog_ptr->bg_green = pBackground->green >> 8;
+            mainprog_ptr->bg_blue  = pBackground->blue  >> 8;
+        } else if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
+            if (bit_depth == 1)
+                mainprog_ptr->bg_red = mainprog_ptr->bg_green =
+                  mainprog_ptr->bg_blue = pBackground->gray? 255 : 0;
+            else if (bit_depth == 2)
+                mainprog_ptr->bg_red = mainprog_ptr->bg_green =
+                  mainprog_ptr->bg_blue = (255/3) * pBackground->gray;
+            else /* bit_depth == 4 */
+                mainprog_ptr->bg_red = mainprog_ptr->bg_green =
+                  mainprog_ptr->bg_blue = (255/15) * pBackground->gray;
+        } else {
+            mainprog_ptr->bg_red   = (uch)pBackground->red;
+            mainprog_ptr->bg_green = (uch)pBackground->green;
+            mainprog_ptr->bg_blue  = (uch)pBackground->blue;
+        }
+    }
+
+
+    /* as before, let libpng expand palette images to RGB, low-bit-depth
+     * grayscale images to 8 bits, transparency chunks to full alpha channel;
+     * strip 16-bit-per-sample images to 8 bits per sample; and convert
+     * grayscale to RGB[A] */
+
+    if (color_type == PNG_COLOR_TYPE_PALETTE)
+        png_set_expand(png_ptr);
+    if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+        png_set_expand(png_ptr);
+    if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+        png_set_expand(png_ptr);
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+    if (bit_depth == 16)
+#  ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+        png_set_scale_16(png_ptr);
+#  else
+        png_set_strip_16(png_ptr);
+#  endif
+#endif
+    if (color_type == PNG_COLOR_TYPE_GRAY ||
+        color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+        png_set_gray_to_rgb(png_ptr);
+
+
+    /* Unlike the basic viewer, which was designed to operate on local files,
+     * this program is intended to simulate a web browser--even though we
+     * actually read from a local file, too.  But because we are pretending
+     * that most of the images originate on the Internet, we follow the recom-
+     * mendation of the sRGB proposal and treat unlabelled images (no gAMA
+     * chunk) as existing in the sRGB color space.  That is, we assume that
+     * such images have a file gamma of 0.45455, which corresponds to a PC-like
+     * display system.  This change in assumptions will have no effect on a
+     * PC-like system, but on a Mac, SGI, NeXT or other system with a non-
+     * identity lookup table, it will darken unlabelled images, which effec-
+     * tively favors images from PC-like systems over those originating on
+     * the local platform.  Note that mainprog_ptr->display_exponent is the
+     * "gamma" value for the entire display system, i.e., the product of
+     * LUT_exponent and CRT_exponent. */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+    if (png_get_gAMA(png_ptr, info_ptr, &gamma))
+        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, gamma);
+    else
+        png_set_gamma(png_ptr, mainprog_ptr->display_exponent, 0.45455);
+#else
+    if (png_get_gAMA_fixed(png_ptr, info_ptr, &gamma))
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), gamma);
+    else
+        png_set_gamma_fixed(png_ptr,
+            (png_fixed_point)(100000*mainprog_ptr->display_exponent+.5), 45455);
+#endif
+
+    /* we'll let libpng expand interlaced images, too */
+
+    mainprog_ptr->passes = png_set_interlace_handling(png_ptr);
+
+
+    /* all transformations have been registered; now update info_ptr data and
+     * then get rowbytes and channels */
+
+    png_read_update_info(png_ptr, info_ptr);
+
+    mainprog_ptr->rowbytes = (int)png_get_rowbytes(png_ptr, info_ptr);
+    mainprog_ptr->channels = png_get_channels(png_ptr, info_ptr);
+
+
+    /* Call the main program to allocate memory for the image buffer and
+     * initialize windows and whatnot.  (The old-style function-pointer
+     * invocation is used for compatibility with a few supposedly ANSI
+     * compilers that nevertheless barf on "fn_ptr()"-style syntax.) */
+
+    (*mainprog_ptr->mainprog_init)();
+
+
+    /* and that takes care of initialization */
+
+    return;
+}
+
+
+
+
+
+static void readpng2_row_callback(png_structp png_ptr, png_bytep new_row,
+                                  png_uint_32 row_num, int pass)
+{
+    mainprog_info  *mainprog_ptr;
+
+
+    /* first check whether the row differs from the previous pass; if not,
+     * nothing to combine or display */
+
+    if (!new_row)
+        return;
+
+
+    /* retrieve the pointer to our special-purpose struct so we can access
+     * the old rows and image-display callback function */
+
+    mainprog_ptr = png_get_progressive_ptr(png_ptr);
+
+
+    /* save the pass number for optional use by the front end */
+
+    mainprog_ptr->pass = pass;
+
+
+    /* have libpng either combine the new row data with the existing row data
+     * from previous passes (if interlaced) or else just copy the new row
+     * into the main program's image buffer */
+
+    png_progressive_combine_row(png_ptr, mainprog_ptr->row_pointers[row_num],
+      new_row);
+
+
+    /* finally, call the display routine in the main program with the number
+     * of the row we just updated */
+
+    (*mainprog_ptr->mainprog_display_row)(row_num);
+
+
+    /* and we're ready for more */
+
+    return;
+}
+
+
+
+
+
+static void readpng2_end_callback(png_structp png_ptr, png_infop info_ptr)
+{
+    mainprog_info  *mainprog_ptr;
+
+
+    /* retrieve the pointer to our special-purpose struct */
+
+    mainprog_ptr = png_get_progressive_ptr(png_ptr);
+
+
+    /* let the main program know that it should flush any buffered image
+     * data to the display now and set a "done" flag or whatever, but note
+     * that it SHOULD NOT DESTROY THE PNG STRUCTS YET--in other words, do
+     * NOT call readpng2_cleanup() either here or in the finish_display()
+     * routine; wait until control returns to the main program via
+     * readpng2_decode_data() */
+
+    (*mainprog_ptr->mainprog_finish_display)();
+
+
+    /* all done */
+
+    return;
+}
+
+
+
+
+
+void readpng2_cleanup(mainprog_info *mainprog_ptr)
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+    if (png_ptr && info_ptr)
+        png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+
+    mainprog_ptr->png_ptr = NULL;
+    mainprog_ptr->info_ptr = NULL;
+}
+
+
+
+
+
+static void readpng2_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "readpng2 libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "readpng2 severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.h b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.h
index 7a59263..6b3660d 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.h
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readpng2.h
@@ -1,116 +1,116 @@
-/*---------------------------------------------------------------------------

-

-   rpng2 - progressive-model PNG display program                 readpng2.h

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#ifndef TRUE

-#  define TRUE 1

-#  define FALSE 0

-#endif

-

-#ifndef MAX

-#  define MAX(a,b)  ((a) > (b)? (a) : (b))

-#  define MIN(a,b)  ((a) < (b)? (a) : (b))

-#endif

-

-#ifdef DEBUG

-#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}

-#else

-#  define Trace(x)  ;

-#endif

-

-enum rpng2_states {

-    kPreInit = 0,

-    kWindowInit,

-    kDone

-};

-

-typedef unsigned char   uch;

-typedef unsigned short  ush;

-typedef unsigned long   ulg;

-

-typedef struct _mainprog_info {

-    double display_exponent;

-    ulg width;

-    ulg height;

-    void *png_ptr;

-    void *info_ptr;

-    void (*mainprog_init)(void);

-    void (*mainprog_display_row)(ulg row_num);

-    void (*mainprog_finish_display)(void);

-    uch *image_data;

-    uch **row_pointers;

-    jmp_buf jmpbuf;

-    int passes;              /* not used */

-    int pass;

-    int rowbytes;

-    int channels;

-    int need_bgcolor;

-    int state;

-    uch bg_red;

-    uch bg_green;

-    uch bg_blue;

-} mainprog_info;

-

-

-/* prototypes for public functions in readpng2.c */

-

-void readpng2_version_info(void);

-

-int readpng2_check_sig(uch *sig, int num);

-

-int readpng2_init(mainprog_info *mainprog_ptr);

-

-int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);

-

-void readpng2_cleanup(mainprog_info *mainprog_ptr);

+/*---------------------------------------------------------------------------
+
+   rpng2 - progressive-model PNG display program                 readpng2.h
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#ifndef TRUE
+#  define TRUE 1
+#  define FALSE 0
+#endif
+
+#ifndef MAX
+#  define MAX(a,b)  ((a) > (b)? (a) : (b))
+#  define MIN(a,b)  ((a) < (b)? (a) : (b))
+#endif
+
+#ifdef DEBUG
+#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
+#else
+#  define Trace(x)  ;
+#endif
+
+enum rpng2_states {
+    kPreInit = 0,
+    kWindowInit,
+    kDone
+};
+
+typedef unsigned char   uch;
+typedef unsigned short  ush;
+typedef unsigned long   ulg;
+
+typedef struct _mainprog_info {
+    double display_exponent;
+    ulg width;
+    ulg height;
+    void *png_ptr;
+    void *info_ptr;
+    void (*mainprog_init)(void);
+    void (*mainprog_display_row)(ulg row_num);
+    void (*mainprog_finish_display)(void);
+    uch *image_data;
+    uch **row_pointers;
+    jmp_buf jmpbuf;
+    int passes;              /* not used */
+    int pass;
+    int rowbytes;
+    int channels;
+    int need_bgcolor;
+    int state;
+    uch bg_red;
+    uch bg_green;
+    uch bg_blue;
+} mainprog_info;
+
+
+/* prototypes for public functions in readpng2.c */
+
+void readpng2_version_info(void);
+
+int readpng2_check_sig(uch *sig, int num);
+
+int readpng2_init(mainprog_info *mainprog_ptr);
+
+int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
+
+void readpng2_cleanup(mainprog_info *mainprog_ptr);
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readppm.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readppm.c
index 1ba2092..be9a56d 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readppm.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/readppm.c
@@ -1,179 +1,179 @@
-/*---------------------------------------------------------------------------

-

-   rpng - simple PNG display program                              readppm.c

-

-  ---------------------------------------------------------------------------

-

-   This is a special-purpose replacement for readpng.c that allows binary

-   PPM files to be used in place of PNG images.

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#include <stdio.h>

-#include <stdlib.h>

-

-#include "readpng.h"    /* typedefs, common macros, public prototypes */

-

-

-ulg  width, height;

-int  bit_depth, color_type, channels;

-uch  *image_data = NULL;

-FILE *saved_infile;

-

-

-void readpng_version_info()

-{

-    fprintf(stderr, "   Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");

-}

-

-

-/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */

-

-int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)

-{

-    static uch ppmline[256];

-    int maxval;

-

-

-    saved_infile = infile;

-

-    fgets(ppmline, 256, infile);

-    if (ppmline[0] != 'P' || ppmline[1] != '6') {

-        fprintf(stderr, "ERROR:  not a PPM file\n");

-        return 1;

-    }

-    /* possible color types:  P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */

-    if (ppmline[1] == '6') {

-        color_type = 2;

-        channels = 3;

-    } else if (ppmline[1] == '8') {

-        color_type = 6;

-        channels = 4;

-    } else /* if (ppmline[1] == '5') */ {

-        color_type = 0;

-        channels = 1;

-    }

-

-    do {

-        fgets(ppmline, 256, infile);

-    } while (ppmline[0] == '#');

-    sscanf(ppmline, "%lu %lu", &width, &height);

-

-    do {

-        fgets(ppmline, 256, infile);

-    } while (ppmline[0] == '#');

-    sscanf(ppmline, "%d", &maxval);

-    if (maxval != 255) {

-        fprintf(stderr, "ERROR:  maxval = %d\n", maxval);

-        return 2;

-    }

-    bit_depth = 8;

-

-    *pWidth = width;

-    *pHeight = height;

-

-    return 0;

-}

-

-

-

-

-/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;

- * scales values to 8-bit if necessary */

-

-int readpng_get_bgcolor(uch *red, uch *green, uch *blue)

-{

-    return 1;

-}

-

-

-

-

-/* display_exponent == LUT_exponent * CRT_exponent */

-

-uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)

-{

-    ulg  rowbytes;

-

-

-    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,

-     * transparency chunks to full alpha channel; strip 16-bit-per-sample

-     * images to 8 bits per sample; and convert grayscale to RGB[A] */

-

-    /* GRR WARNING:  grayscale needs to be expanded and channels reset! */

-

-    *pRowbytes = rowbytes = channels*width;

-    *pChannels = channels;

-

-    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {

-        return NULL;

-    }

-

-    Trace((stderr, "readpng_get_image:  rowbytes = %ld, height = %ld\n", rowbytes, height));

-

-

-    /* now we can go ahead and just read the whole image */

-

-    fread(image_data, 1L, rowbytes*height, saved_infile);

-

-

-    return image_data;

-}

-

-

-void readpng_cleanup(int free_image_data)

-{

-    if (free_image_data && image_data) {

-        free(image_data);

-        image_data = NULL;

-    }

-}

+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                              readppm.c
+
+  ---------------------------------------------------------------------------
+
+   This is a special-purpose replacement for readpng.c that allows binary
+   PPM files to be used in place of PNG images.
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "readpng.h"    /* typedefs, common macros, public prototypes */
+
+
+ulg  width, height;
+int  bit_depth, color_type, channels;
+uch  *image_data = NULL;
+FILE *saved_infile;
+
+
+void readpng_version_info()
+{
+    fprintf(stderr, "   Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");
+}
+
+
+/* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
+
+int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
+{
+    static uch ppmline[256];
+    int maxval;
+
+
+    saved_infile = infile;
+
+    fgets(ppmline, 256, infile);
+    if (ppmline[0] != 'P' || ppmline[1] != '6') {
+        fprintf(stderr, "ERROR:  not a PPM file\n");
+        return 1;
+    }
+    /* possible color types:  P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */
+    if (ppmline[1] == '6') {
+        color_type = 2;
+        channels = 3;
+    } else if (ppmline[1] == '8') {
+        color_type = 6;
+        channels = 4;
+    } else /* if (ppmline[1] == '5') */ {
+        color_type = 0;
+        channels = 1;
+    }
+
+    do {
+        fgets(ppmline, 256, infile);
+    } while (ppmline[0] == '#');
+    sscanf(ppmline, "%lu %lu", &width, &height);
+
+    do {
+        fgets(ppmline, 256, infile);
+    } while (ppmline[0] == '#');
+    sscanf(ppmline, "%d", &maxval);
+    if (maxval != 255) {
+        fprintf(stderr, "ERROR:  maxval = %d\n", maxval);
+        return 2;
+    }
+    bit_depth = 8;
+
+    *pWidth = width;
+    *pHeight = height;
+
+    return 0;
+}
+
+
+
+
+/* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
+ * scales values to 8-bit if necessary */
+
+int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
+{
+    return 1;
+}
+
+
+
+
+/* display_exponent == LUT_exponent * CRT_exponent */
+
+uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
+{
+    ulg  rowbytes;
+
+
+    /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
+     * transparency chunks to full alpha channel; strip 16-bit-per-sample
+     * images to 8 bits per sample; and convert grayscale to RGB[A] */
+
+    /* GRR WARNING:  grayscale needs to be expanded and channels reset! */
+
+    *pRowbytes = rowbytes = channels*width;
+    *pChannels = channels;
+
+    if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
+        return NULL;
+    }
+
+    Trace((stderr, "readpng_get_image:  rowbytes = %ld, height = %ld\n", rowbytes, height));
+
+
+    /* now we can go ahead and just read the whole image */
+
+    fread(image_data, 1L, rowbytes*height, saved_infile);
+
+
+    return image_data;
+}
+
+
+void readpng_cleanup(int free_image_data)
+{
+    if (free_image_data && image_data) {
+        free(image_data);
+        image_data = NULL;
+    }
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-win.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-win.c
index 1c22282..f53ddc8 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-win.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-win.c
@@ -1,728 +1,728 @@
-/*---------------------------------------------------------------------------

-

-   rpng - simple PNG display program                             rpng-win.c

-

-   This program decodes and displays PNG images, with gamma correction and

-   optionally with a user-specified background color (in case the image has

-   transparency).  It is very nearly the most basic PNG viewer possible.

-   This version is for 32-bit Windows; it may compile under 16-bit Windows

-   with a little tweaking (or maybe not).

-

-   to do:

-    - handle quoted command-line args (especially filenames with spaces)

-    - have minimum window width:  oh well

-    - use %.1023s to simplify truncation of title-bar string?

-

-  ---------------------------------------------------------------------------

-

-   Changelog:

-    - 1.00:  initial public release

-    - 1.01:  modified to allow abbreviated options; fixed long/ulong mis-

-              match; switched to png_jmpbuf() macro

-    - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed

-              command-line parsing bug

-    - 1.10:  enabled "message window"/console (thanks to David Geldreich)

-    - 2.00:  dual-licensed (added GNU GPL)

-    - 2.01:  fixed improper display of usage screen on PNG error(s)

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#define PROGNAME  "rpng-win"

-#define LONGNAME  "Simple PNG Viewer for Windows"

-#define VERSION   "2.01 of 16 March 2008"

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <string.h>

-#include <time.h>

-#include <windows.h>

-#ifdef __CYGWIN__

-/* getch replacement. Turns out, we don't really need this,

- * but leave it here if we ever enable any of the uses of

- * _getch in the main code

- */

-#include <unistd.h>

-#include <termio.h>

-#include <sys/ioctl.h>

-int repl_getch( void )

-{

-  char ch;

-  int fd = fileno(stdin);

-  struct termio old_tty, new_tty;

-

-  ioctl(fd, TCGETA, &old_tty);

-  new_tty = old_tty;

-  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);

-  ioctl(fd, TCSETA, &new_tty);

-  fread(&ch, 1, sizeof(ch), stdin);

-  ioctl(fd, TCSETA, &old_tty);

-

-  return ch;

-}

-#define _getch repl_getch

-#else

-#include <conio.h>      /* only for _getch() */

-#endif

-

-/* #define DEBUG  :  this enables the Trace() macros */

-

-#include "readpng.h"    /* typedefs, common macros, readpng prototypes */

-

-

-/* could just include png.h, but this macro is the only thing we need

- * (name and typedefs changed to local versions); note that side effects

- * only happen with alpha (which could easily be avoided with

- * "ush acopy = (alpha);") */

-

-#define alpha_composite(composite, fg, alpha, bg) {               \

-    ush temp = ((ush)(fg)*(ush)(alpha) +                          \

-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \

-    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \

-}

-

-

-/* local prototypes */

-static int        rpng_win_create_window(HINSTANCE hInst, int showmode);

-static int        rpng_win_display_image(void);

-static void       rpng_win_cleanup(void);

-LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);

-

-

-static char titlebar[1024];

-static char *progname = PROGNAME;

-static char *appname = LONGNAME;

-static char *filename;

-static FILE *infile;

-

-static char *bgstr;

-static uch bg_red=0, bg_green=0, bg_blue=0;

-

-static double display_exponent;

-

-static ulg image_width, image_height, image_rowbytes;

-static int image_channels;

-static uch *image_data;

-

-/* Windows-specific variables */

-static ulg wimage_rowbytes;

-static uch *dib;

-static uch *wimage_data;

-static BITMAPINFOHEADER *bmih;

-

-static HWND global_hwnd;

-

-

-

-

-int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)

-{

-    char *args[1024];                 /* arbitrary limit, but should suffice */

-    char *p, *q, **argv = args;

-    int argc = 0;

-    int rc, alen, flen;

-    int error = 0;

-    int have_bg = FALSE;

-    double LUT_exponent;              /* just the lookup table */

-    double CRT_exponent = 2.2;        /* just the monitor */

-    double default_display_exponent;  /* whole display system */

-    MSG msg;

-

-

-    filename = (char *)NULL;

-

-#ifndef __CYGWIN__

-    /* First reenable console output, which normally goes to the bit bucket

-     * for windowed apps.  Closing the console window will terminate the

-     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical

-     * incantation. */

-

-    AllocConsole();

-    freopen("CONOUT$", "a", stderr);

-    freopen("CONOUT$", "a", stdout);

-#endif

-

-

-    /* Next set the default value for our display-system exponent, i.e.,

-     * the product of the CRT exponent and the exponent corresponding to

-     * the frame-buffer's lookup table (LUT), if any.  This is not an

-     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird

-     * ones), but it should cover 99% of the current possibilities.  And

-     * yes, these ifdefs are completely wasted in a Windows program... */

-

-#if defined(NeXT)

-    LUT_exponent = 1.0 / 2.2;

-    /*

-    if (some_next_function_that_returns_gamma(&next_gamma))

-        LUT_exponent = 1.0 / next_gamma;

-     */

-#elif defined(sgi)

-    LUT_exponent = 1.0 / 1.7;

-    /* there doesn't seem to be any documented function to get the

-     * "gamma" value, so we do it the hard way */

-    infile = fopen("/etc/config/system.glGammaVal", "r");

-    if (infile) {

-        double sgi_gamma;

-

-        fgets(tmpline, 80, infile);

-        fclose(infile);

-        sgi_gamma = atof(tmpline);

-        if (sgi_gamma > 0.0)

-            LUT_exponent = 1.0 / sgi_gamma;

-    }

-#elif defined(Macintosh)

-    LUT_exponent = 1.8 / 2.61;

-    /*

-    if (some_mac_function_that_returns_gamma(&mac_gamma))

-        LUT_exponent = mac_gamma / 2.61;

-     */

-#else

-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */

-#endif

-

-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */

-    default_display_exponent = LUT_exponent * CRT_exponent;

-

-

-    /* If the user has set the SCREEN_GAMMA environment variable as suggested

-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise

-     * use the default value we just calculated.  Either way, the user may

-     * override this via a command-line option. */

-

-    if ((p = getenv("SCREEN_GAMMA")) != NULL)

-        display_exponent = atof(p);

-    else

-        display_exponent = default_display_exponent;

-

-

-    /* Windows really hates command lines, so we have to set up our own argv.

-     * Note that we do NOT bother with quoted arguments here, so don't use

-     * filenames with spaces in 'em! */

-

-    argv[argc++] = PROGNAME;

-    p = cmd;

-    for (;;) {

-        if (*p == ' ')

-            while (*++p == ' ')

-                ;

-        /* now p points at the first non-space after some spaces */

-        if (*p == '\0')

-            break;    /* nothing after the spaces:  done */

-        argv[argc++] = q = p;

-        while (*q && *q != ' ')

-            ++q;

-        /* now q points at a space or the end of the string */

-        if (*q == '\0')

-            break;    /* last argv already terminated; quit */

-        *q = '\0';    /* change space to terminator */

-        p = q + 1;

-    }

-    argv[argc] = NULL;   /* terminate the argv array itself */

-

-

-    /* Now parse the command line for options and the PNG filename. */

-

-    while (*++argv && !error) {

-        if (!strncmp(*argv, "-gamma", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                display_exponent = atof(*argv);

-                if (display_exponent <= 0.0)

-                    ++error;

-            }

-        } else if (!strncmp(*argv, "-bgcolor", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                bgstr = *argv;

-                if (strlen(bgstr) != 7 || bgstr[0] != '#')

-                    ++error;

-                else

-                    have_bg = TRUE;

-            }

-        } else {

-            if (**argv != '-') {

-                filename = *argv;

-                if (argv[1])   /* shouldn't be any more args after filename */

-                    ++error;

-            } else

-                ++error;   /* not expecting any other options */

-        }

-    }

-

-    if (!filename)

-        ++error;

-

-

-    /* print usage screen if any errors up to this point */

-

-    if (error) {

-#ifndef __CYGWIN__

-        int ch;

-#endif

-

-        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);

-        readpng_version_info();

-        fprintf(stderr, "\n"

-          "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\n"

-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"

-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"

-          "\t\t  to the product of the lookup-table exponent (varies)\n"

-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"

-          "    bg  \tdesired background color in 7-character hex RGB format\n"

-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"

-          "\t\t  used with transparent images\n"

-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"

-#ifndef __CYGWIN__

-          "Press Q or Esc to quit this usage screen.\n"

-#endif

-          "\n", PROGNAME, default_display_exponent);

-#ifndef __CYGWIN__

-        do

-            ch = _getch();

-        while (ch != 'q' && ch != 'Q' && ch != 0x1B);

-#endif

-        exit(1);

-    }

-

-

-    if (!(infile = fopen(filename, "rb"))) {

-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);

-        ++error;

-    } else {

-        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {

-            switch (rc) {

-                case 1:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] is not a PNG file: incorrect signature\n",

-                      filename);

-                    break;

-                case 2:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);

-                    break;

-                case 4:

-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");

-                    break;

-                default:

-                    fprintf(stderr, PROGNAME

-                      ":  unknown readpng_init() error\n");

-                    break;

-            }

-            ++error;

-        }

-        if (error)

-            fclose(infile);

-    }

-

-

-    if (error) {

-#ifndef __CYGWIN__

-        int ch;

-#endif

-

-        fprintf(stderr, PROGNAME ":  aborting.\n");

-#ifndef __CYGWIN__

-        do

-            ch = _getch();

-        while (ch != 'q' && ch != 'Q' && ch != 0x1B);

-#endif

-        exit(2);

-    } else {

-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);

-#ifndef __CYGWIN__

-        fprintf(stderr,

-          "\n   [console window:  closing this window will terminate %s]\n\n",

-          PROGNAME);

-#endif

-    }

-

-

-    /* set the title-bar string, but make sure buffer doesn't overflow */

-

-    alen = strlen(appname);

-    flen = strlen(filename);

-    if (alen + flen + 3 > 1023)

-        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));

-    else

-        sprintf(titlebar, "%s:  %s", appname, filename);

-

-

-    /* if the user didn't specify a background color on the command line,

-     * check for one in the PNG file--if not, the initialized values of 0

-     * (black) will be used */

-

-    if (have_bg) {

-        unsigned r, g, b;   /* this approach quiets compiler warnings */

-

-        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);

-        bg_red   = (uch)r;

-        bg_green = (uch)g;

-        bg_blue  = (uch)b;

-    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {

-        readpng_cleanup(TRUE);

-        fprintf(stderr, PROGNAME

-          ":  libpng error while checking for background color\n");

-        exit(2);

-    }

-

-

-    /* do the basic Windows initialization stuff, make the window and fill it

-     * with the background color */

-

-    if (rpng_win_create_window(hInst, showmode))

-        exit(2);

-

-

-    /* decode the image, all at once */

-

-    Trace((stderr, "calling readpng_get_image()\n"))

-    image_data = readpng_get_image(display_exponent, &image_channels,

-      &image_rowbytes);

-    Trace((stderr, "done with readpng_get_image()\n"))

-

-

-    /* done with PNG file, so clean up to minimize memory usage (but do NOT

-     * nuke image_data!) */

-

-    readpng_cleanup(FALSE);

-    fclose(infile);

-

-    if (!image_data) {

-        fprintf(stderr, PROGNAME ":  unable to decode PNG image\n");

-        exit(3);

-    }

-

-

-    /* display image (composite with background if requested) */

-

-    Trace((stderr, "calling rpng_win_display_image()\n"))

-    if (rpng_win_display_image()) {

-        free(image_data);

-        exit(4);

-    }

-    Trace((stderr, "done with rpng_win_display_image()\n"))

-

-

-    /* wait for the user to tell us when to quit */

-

-    printf(

-#ifndef __CYGWIN__

-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"

-#else

-      "Done.  Press mouse button 1 (within image window) to quit.\n"

-#endif

-    );

-    fflush(stdout);

-

-    while (GetMessage(&msg, NULL, 0, 0)) {

-        TranslateMessage(&msg);

-        DispatchMessage(&msg);

-    }

-

-

-    /* OK, we're done:  clean up all image and Windows resources and go away */

-

-    rpng_win_cleanup();

-

-    return msg.wParam;

-}

-

-

-

-

-

-static int rpng_win_create_window(HINSTANCE hInst, int showmode)

-{

-    uch *dest;

-    int extra_width, extra_height;

-    ulg i, j;

-    WNDCLASSEX wndclass;

-

-

-/*---------------------------------------------------------------------------

-    Allocate memory for the display-specific version of the image (round up

-    to multiple of 4 for Windows DIB).

-  ---------------------------------------------------------------------------*/

-

-    wimage_rowbytes = ((3*image_width + 3L) >> 2) << 2;

-

-    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +

-                              wimage_rowbytes*image_height)))

-    {

-        return 4;   /* fail */

-    }

-

-/*---------------------------------------------------------------------------

-    Initialize the DIB.  Negative height means to use top-down BMP ordering

-    (must be uncompressed, but that's what we want).  Bit count of 1, 4 or 8

-    implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values

-    directly => wimage_data begins immediately after BMP header.

-  ---------------------------------------------------------------------------*/

-

-    memset(dib, 0, sizeof(BITMAPINFOHEADER));

-    bmih = (BITMAPINFOHEADER *)dib;

-    bmih->biSize = sizeof(BITMAPINFOHEADER);

-    bmih->biWidth = image_width;

-    bmih->biHeight = -((long)image_height);

-    bmih->biPlanes = 1;

-    bmih->biBitCount = 24;

-    bmih->biCompression = 0;

-    wimage_data = dib + sizeof(BITMAPINFOHEADER);

-

-/*---------------------------------------------------------------------------

-    Fill in background color (black by default); data are in BGR order.

-  ---------------------------------------------------------------------------*/

-

-    for (j = 0;  j < image_height;  ++j) {

-        dest = wimage_data + j*wimage_rowbytes;

-        for (i = image_width;  i > 0;  --i) {

-            *dest++ = bg_blue;

-            *dest++ = bg_green;

-            *dest++ = bg_red;

-        }

-    }

-

-/*---------------------------------------------------------------------------

-    Set the window parameters.

-  ---------------------------------------------------------------------------*/

-

-    memset(&wndclass, 0, sizeof(wndclass));

-

-    wndclass.cbSize = sizeof(wndclass);

-    wndclass.style = CS_HREDRAW | CS_VREDRAW;

-    wndclass.lpfnWndProc = rpng_win_wndproc;

-    wndclass.hInstance = hInst;

-    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

-    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

-    wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);

-    wndclass.lpszMenuName = NULL;

-    wndclass.lpszClassName = progname;

-    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

-

-    RegisterClassEx(&wndclass);

-

-/*---------------------------------------------------------------------------

-    Finally, create the window.

-  ---------------------------------------------------------------------------*/

-

-    extra_width  = 2*(GetSystemMetrics(SM_CXBORDER) +

-                      GetSystemMetrics(SM_CXDLGFRAME));

-    extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +

-                      GetSystemMetrics(SM_CYDLGFRAME)) +

-                      GetSystemMetrics(SM_CYCAPTION);

-

-    global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,

-      CW_USEDEFAULT, CW_USEDEFAULT, image_width+extra_width,

-      image_height+extra_height, NULL, NULL, hInst, NULL);

-

-    ShowWindow(global_hwnd, showmode);

-    UpdateWindow(global_hwnd);

-

-    return 0;

-

-} /* end function rpng_win_create_window() */

-

-

-

-

-

-static int rpng_win_display_image()

-{

-    uch *src, *dest;

-    uch r, g, b, a;

-    ulg i, row, lastrow;

-    RECT rect;

-

-

-    Trace((stderr, "beginning display loop (image_channels == %d)\n",

-      image_channels))

-    Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n",

-      image_width, image_rowbytes, wimage_rowbytes))

-

-

-/*---------------------------------------------------------------------------

-    Blast image data to buffer.  This whole routine takes place before the

-    message loop begins, so there's no real point in any pseudo-progressive

-    display...

-  ---------------------------------------------------------------------------*/

-

-    for (lastrow = row = 0;  row < image_height;  ++row) {

-        src = image_data + row*image_rowbytes;

-        dest = wimage_data + row*wimage_rowbytes;

-        if (image_channels == 3) {

-            for (i = image_width;  i > 0;  --i) {

-                r = *src++;

-                g = *src++;

-                b = *src++;

-                *dest++ = b;

-                *dest++ = g;   /* note reverse order */

-                *dest++ = r;

-            }

-        } else /* if (image_channels == 4) */ {

-            for (i = image_width;  i > 0;  --i) {

-                r = *src++;

-                g = *src++;

-                b = *src++;

-                a = *src++;

-                if (a == 255) {

-                    *dest++ = b;

-                    *dest++ = g;

-                    *dest++ = r;

-                } else if (a == 0) {

-                    *dest++ = bg_blue;

-                    *dest++ = bg_green;

-                    *dest++ = bg_red;

-                } else {

-                    /* this macro (copied from png.h) composites the

-                     * foreground and background values and puts the

-                     * result into the first argument; there are no

-                     * side effects with the first argument */

-                    alpha_composite(*dest++, b, a, bg_blue);

-                    alpha_composite(*dest++, g, a, bg_green);

-                    alpha_composite(*dest++, r, a, bg_red);

-                }

-            }

-        }

-        /* display after every 16 lines */

-        if (((row+1) & 0xf) == 0) {

-            rect.left = 0L;

-            rect.top = (LONG)lastrow;

-            rect.right = (LONG)image_width;      /* possibly off by one? */

-            rect.bottom = (LONG)lastrow + 16L;   /* possibly off by one? */

-            InvalidateRect(global_hwnd, &rect, FALSE);

-            UpdateWindow(global_hwnd);     /* similar to XFlush() */

-            lastrow = row + 1;

-        }

-    }

-

-    Trace((stderr, "calling final image-flush routine\n"))

-    if (lastrow < image_height) {

-        rect.left = 0L;

-        rect.top = (LONG)lastrow;

-        rect.right = (LONG)image_width;      /* possibly off by one? */

-        rect.bottom = (LONG)image_height;    /* possibly off by one? */

-        InvalidateRect(global_hwnd, &rect, FALSE);

-        UpdateWindow(global_hwnd);     /* similar to XFlush() */

-    }

-

-/*

-    last param determines whether or not background is wiped before paint

-    InvalidateRect(global_hwnd, NULL, TRUE);

-    UpdateWindow(global_hwnd);

- */

-

-    return 0;

-}

-

-

-

-

-

-static void rpng_win_cleanup()

-{

-    if (image_data) {

-        free(image_data);

-        image_data = NULL;

-    }

-

-    if (dib) {

-        free(dib);

-        dib = NULL;

-    }

-}

-

-

-

-

-

-LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)

-{

-    HDC         hdc;

-    PAINTSTRUCT ps;

-    int rc;

-

-    switch (iMsg) {

-        case WM_CREATE:

-            /* one-time processing here, if any */

-            return 0;

-

-        case WM_PAINT:

-            hdc = BeginPaint(hwnd, &ps);

-                    /*                    dest                          */

-            rc = StretchDIBits(hdc, 0, 0, image_width, image_height,

-                    /*                    source                        */

-                                    0, 0, image_width, image_height,

-                                    wimage_data, (BITMAPINFO *)bmih,

-                    /*              iUsage: no clue                     */

-                                    0, SRCCOPY);

-            EndPaint(hwnd, &ps);

-            return 0;

-

-        /* wait for the user to tell us when to quit */

-        case WM_CHAR:

-            switch (wP) {      /* only need one, so ignore repeat count */

-                case 'q':

-                case 'Q':

-                case 0x1B:     /* Esc key */

-                    PostQuitMessage(0);

-            }

-            return 0;

-

-        case WM_LBUTTONDOWN:   /* another way of quitting */

-        case WM_DESTROY:

-            PostQuitMessage(0);

-            return 0;

-    }

-

-    return DefWindowProc(hwnd, iMsg, wP, lP);

-}

+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                             rpng-win.c
+
+   This program decodes and displays PNG images, with gamma correction and
+   optionally with a user-specified background color (in case the image has
+   transparency).  It is very nearly the most basic PNG viewer possible.
+   This version is for 32-bit Windows; it may compile under 16-bit Windows
+   with a little tweaking (or maybe not).
+
+   to do:
+    - handle quoted command-line args (especially filenames with spaces)
+    - have minimum window width:  oh well
+    - use %.1023s to simplify truncation of title-bar string?
+
+  ---------------------------------------------------------------------------
+
+   Changelog:
+    - 1.00:  initial public release
+    - 1.01:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.02:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#define PROGNAME  "rpng-win"
+#define LONGNAME  "Simple PNG Viewer for Windows"
+#define VERSION   "2.01 of 16 March 2008"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
+#include <conio.h>      /* only for _getch() */
+#endif
+
+/* #define DEBUG  :  this enables the Trace() macros */
+
+#include "readpng.h"    /* typedefs, common macros, readpng prototypes */
+
+
+/* could just include png.h, but this macro is the only thing we need
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
+ * "ush acopy = (alpha);") */
+
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
+}
+
+
+/* local prototypes */
+static int        rpng_win_create_window(HINSTANCE hInst, int showmode);
+static int        rpng_win_display_image(void);
+static void       rpng_win_cleanup(void);
+LRESULT CALLBACK  rpng_win_wndproc(HWND, UINT, WPARAM, LPARAM);
+
+
+static char titlebar[1024];
+static char *progname = PROGNAME;
+static char *appname = LONGNAME;
+static char *filename;
+static FILE *infile;
+
+static char *bgstr;
+static uch bg_red=0, bg_green=0, bg_blue=0;
+
+static double display_exponent;
+
+static ulg image_width, image_height, image_rowbytes;
+static int image_channels;
+static uch *image_data;
+
+/* Windows-specific variables */
+static ulg wimage_rowbytes;
+static uch *dib;
+static uch *wimage_data;
+static BITMAPINFOHEADER *bmih;
+
+static HWND global_hwnd;
+
+
+
+
+int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
+{
+    char *args[1024];                 /* arbitrary limit, but should suffice */
+    char *p, *q, **argv = args;
+    int argc = 0;
+    int rc, alen, flen;
+    int error = 0;
+    int have_bg = FALSE;
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
+    MSG msg;
+
+
+    filename = (char *)NULL;
+
+#ifndef __CYGWIN__
+    /* First reenable console output, which normally goes to the bit bucket
+     * for windowed apps.  Closing the console window will terminate the
+     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
+     * incantation. */
+
+    AllocConsole();
+    freopen("CONOUT$", "a", stderr);
+    freopen("CONOUT$", "a", stdout);
+#endif
+
+
+    /* Next set the default value for our display-system exponent, i.e.,
+     * the product of the CRT exponent and the exponent corresponding to
+     * the frame-buffer's lookup table (LUT), if any.  This is not an
+     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
+     * ones), but it should cover 99% of the current possibilities.  And
+     * yes, these ifdefs are completely wasted in a Windows program... */
+
+#if defined(NeXT)
+    LUT_exponent = 1.0 / 2.2;
+    /*
+    if (some_next_function_that_returns_gamma(&next_gamma))
+        LUT_exponent = 1.0 / next_gamma;
+     */
+#elif defined(sgi)
+    LUT_exponent = 1.0 / 1.7;
+    /* there doesn't seem to be any documented function to get the
+     * "gamma" value, so we do it the hard way */
+    infile = fopen("/etc/config/system.glGammaVal", "r");
+    if (infile) {
+        double sgi_gamma;
+
+        fgets(tmpline, 80, infile);
+        fclose(infile);
+        sgi_gamma = atof(tmpline);
+        if (sgi_gamma > 0.0)
+            LUT_exponent = 1.0 / sgi_gamma;
+    }
+#elif defined(Macintosh)
+    LUT_exponent = 1.8 / 2.61;
+    /*
+    if (some_mac_function_that_returns_gamma(&mac_gamma))
+        LUT_exponent = mac_gamma / 2.61;
+     */
+#else
+    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
+#endif
+
+    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+    default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+    /* If the user has set the SCREEN_GAMMA environment variable as suggested
+     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+     * use the default value we just calculated.  Either way, the user may
+     * override this via a command-line option. */
+
+    if ((p = getenv("SCREEN_GAMMA")) != NULL)
+        display_exponent = atof(p);
+    else
+        display_exponent = default_display_exponent;
+
+
+    /* Windows really hates command lines, so we have to set up our own argv.
+     * Note that we do NOT bother with quoted arguments here, so don't use
+     * filenames with spaces in 'em! */
+
+    argv[argc++] = PROGNAME;
+    p = cmd;
+    for (;;) {
+        if (*p == ' ')
+            while (*++p == ' ')
+                ;
+        /* now p points at the first non-space after some spaces */
+        if (*p == '\0')
+            break;    /* nothing after the spaces:  done */
+        argv[argc++] = q = p;
+        while (*q && *q != ' ')
+            ++q;
+        /* now q points at a space or the end of the string */
+        if (*q == '\0')
+            break;    /* last argv already terminated; quit */
+        *q = '\0';    /* change space to terminator */
+        p = q + 1;
+    }
+    argv[argc] = NULL;   /* terminate the argv array itself */
+
+
+    /* Now parse the command line for options and the PNG filename. */
+
+    while (*++argv && !error) {
+        if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else
+                    have_bg = TRUE;
+            }
+        } else {
+            if (**argv != '-') {
+                filename = *argv;
+                if (argv[1])   /* shouldn't be any more args after filename */
+                    ++error;
+            } else
+                ++error;   /* not expecting any other options */
+        }
+    }
+
+    if (!filename)
+        ++error;
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+#ifndef __CYGWIN__
+        int ch;
+#endif
+
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
+        readpng_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-gamma exp] [-bgcolor bg] file.png\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+#ifndef __CYGWIN__
+          "Press Q or Esc to quit this usage screen.\n"
+#endif
+          "\n", PROGNAME, default_display_exponent);
+#ifndef __CYGWIN__
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
+            switch (rc) {
+                case 1:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] is not a PNG file: incorrect signature\n",
+                      filename);
+                    break;
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng_init() error\n");
+                    break;
+            }
+            ++error;
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+#ifndef __CYGWIN__
+        int ch;
+#endif
+
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
+        exit(2);
+    } else {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
+        fprintf(stderr,
+          "\n   [console window:  closing this window will terminate %s]\n\n",
+          PROGNAME);
+#endif
+    }
+
+
+    /* set the title-bar string, but make sure buffer doesn't overflow */
+
+    alen = strlen(appname);
+    flen = strlen(filename);
+    if (alen + flen + 3 > 1023)
+        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));
+    else
+        sprintf(titlebar, "%s:  %s", appname, filename);
+
+
+    /* if the user didn't specify a background color on the command line,
+     * check for one in the PNG file--if not, the initialized values of 0
+     * (black) will be used */
+
+    if (have_bg) {
+        unsigned r, g, b;   /* this approach quiets compiler warnings */
+
+        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+        bg_red   = (uch)r;
+        bg_green = (uch)g;
+        bg_blue  = (uch)b;
+    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
+        readpng_cleanup(TRUE);
+        fprintf(stderr, PROGNAME
+          ":  libpng error while checking for background color\n");
+        exit(2);
+    }
+
+
+    /* do the basic Windows initialization stuff, make the window and fill it
+     * with the background color */
+
+    if (rpng_win_create_window(hInst, showmode))
+        exit(2);
+
+
+    /* decode the image, all at once */
+
+    Trace((stderr, "calling readpng_get_image()\n"))
+    image_data = readpng_get_image(display_exponent, &image_channels,
+      &image_rowbytes);
+    Trace((stderr, "done with readpng_get_image()\n"))
+
+
+    /* done with PNG file, so clean up to minimize memory usage (but do NOT
+     * nuke image_data!) */
+
+    readpng_cleanup(FALSE);
+    fclose(infile);
+
+    if (!image_data) {
+        fprintf(stderr, PROGNAME ":  unable to decode PNG image\n");
+        exit(3);
+    }
+
+
+    /* display image (composite with background if requested) */
+
+    Trace((stderr, "calling rpng_win_display_image()\n"))
+    if (rpng_win_display_image()) {
+        free(image_data);
+        exit(4);
+    }
+    Trace((stderr, "done with rpng_win_display_image()\n"))
+
+
+    /* wait for the user to tell us when to quit */
+
+    printf(
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
+    fflush(stdout);
+
+    while (GetMessage(&msg, NULL, 0, 0)) {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+
+    /* OK, we're done:  clean up all image and Windows resources and go away */
+
+    rpng_win_cleanup();
+
+    return msg.wParam;
+}
+
+
+
+
+
+static int rpng_win_create_window(HINSTANCE hInst, int showmode)
+{
+    uch *dest;
+    int extra_width, extra_height;
+    ulg i, j;
+    WNDCLASSEX wndclass;
+
+
+/*---------------------------------------------------------------------------
+    Allocate memory for the display-specific version of the image (round up
+    to multiple of 4 for Windows DIB).
+  ---------------------------------------------------------------------------*/
+
+    wimage_rowbytes = ((3*image_width + 3L) >> 2) << 2;
+
+    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
+                              wimage_rowbytes*image_height)))
+    {
+        return 4;   /* fail */
+    }
+
+/*---------------------------------------------------------------------------
+    Initialize the DIB.  Negative height means to use top-down BMP ordering
+    (must be uncompressed, but that's what we want).  Bit count of 1, 4 or 8
+    implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
+    directly => wimage_data begins immediately after BMP header.
+  ---------------------------------------------------------------------------*/
+
+    memset(dib, 0, sizeof(BITMAPINFOHEADER));
+    bmih = (BITMAPINFOHEADER *)dib;
+    bmih->biSize = sizeof(BITMAPINFOHEADER);
+    bmih->biWidth = image_width;
+    bmih->biHeight = -((long)image_height);
+    bmih->biPlanes = 1;
+    bmih->biBitCount = 24;
+    bmih->biCompression = 0;
+    wimage_data = dib + sizeof(BITMAPINFOHEADER);
+
+/*---------------------------------------------------------------------------
+    Fill in background color (black by default); data are in BGR order.
+  ---------------------------------------------------------------------------*/
+
+    for (j = 0;  j < image_height;  ++j) {
+        dest = wimage_data + j*wimage_rowbytes;
+        for (i = image_width;  i > 0;  --i) {
+            *dest++ = bg_blue;
+            *dest++ = bg_green;
+            *dest++ = bg_red;
+        }
+    }
+
+/*---------------------------------------------------------------------------
+    Set the window parameters.
+  ---------------------------------------------------------------------------*/
+
+    memset(&wndclass, 0, sizeof(wndclass));
+
+    wndclass.cbSize = sizeof(wndclass);
+    wndclass.style = CS_HREDRAW | CS_VREDRAW;
+    wndclass.lpfnWndProc = rpng_win_wndproc;
+    wndclass.hInstance = hInst;
+    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
+    wndclass.lpszMenuName = NULL;
+    wndclass.lpszClassName = progname;
+    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
+
+    RegisterClassEx(&wndclass);
+
+/*---------------------------------------------------------------------------
+    Finally, create the window.
+  ---------------------------------------------------------------------------*/
+
+    extra_width  = 2*(GetSystemMetrics(SM_CXBORDER) +
+                      GetSystemMetrics(SM_CXDLGFRAME));
+    extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
+                      GetSystemMetrics(SM_CYDLGFRAME)) +
+                      GetSystemMetrics(SM_CYCAPTION);
+
+    global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
+      CW_USEDEFAULT, CW_USEDEFAULT, image_width+extra_width,
+      image_height+extra_height, NULL, NULL, hInst, NULL);
+
+    ShowWindow(global_hwnd, showmode);
+    UpdateWindow(global_hwnd);
+
+    return 0;
+
+} /* end function rpng_win_create_window() */
+
+
+
+
+
+static int rpng_win_display_image()
+{
+    uch *src, *dest;
+    uch r, g, b, a;
+    ulg i, row, lastrow;
+    RECT rect;
+
+
+    Trace((stderr, "beginning display loop (image_channels == %d)\n",
+      image_channels))
+    Trace((stderr, "(width = %ld, rowbytes = %ld, wimage_rowbytes = %d)\n",
+      image_width, image_rowbytes, wimage_rowbytes))
+
+
+/*---------------------------------------------------------------------------
+    Blast image data to buffer.  This whole routine takes place before the
+    message loop begins, so there's no real point in any pseudo-progressive
+    display...
+  ---------------------------------------------------------------------------*/
+
+    for (lastrow = row = 0;  row < image_height;  ++row) {
+        src = image_data + row*image_rowbytes;
+        dest = wimage_data + row*wimage_rowbytes;
+        if (image_channels == 3) {
+            for (i = image_width;  i > 0;  --i) {
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                *dest++ = b;
+                *dest++ = g;   /* note reverse order */
+                *dest++ = r;
+            }
+        } else /* if (image_channels == 4) */ {
+            for (i = image_width;  i > 0;  --i) {
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                a = *src++;
+                if (a == 255) {
+                    *dest++ = b;
+                    *dest++ = g;
+                    *dest++ = r;
+                } else if (a == 0) {
+                    *dest++ = bg_blue;
+                    *dest++ = bg_green;
+                    *dest++ = bg_red;
+                } else {
+                    /* this macro (copied from png.h) composites the
+                     * foreground and background values and puts the
+                     * result into the first argument; there are no
+                     * side effects with the first argument */
+                    alpha_composite(*dest++, b, a, bg_blue);
+                    alpha_composite(*dest++, g, a, bg_green);
+                    alpha_composite(*dest++, r, a, bg_red);
+                }
+            }
+        }
+        /* display after every 16 lines */
+        if (((row+1) & 0xf) == 0) {
+            rect.left = 0L;
+            rect.top = (LONG)lastrow;
+            rect.right = (LONG)image_width;      /* possibly off by one? */
+            rect.bottom = (LONG)lastrow + 16L;   /* possibly off by one? */
+            InvalidateRect(global_hwnd, &rect, FALSE);
+            UpdateWindow(global_hwnd);     /* similar to XFlush() */
+            lastrow = row + 1;
+        }
+    }
+
+    Trace((stderr, "calling final image-flush routine\n"))
+    if (lastrow < image_height) {
+        rect.left = 0L;
+        rect.top = (LONG)lastrow;
+        rect.right = (LONG)image_width;      /* possibly off by one? */
+        rect.bottom = (LONG)image_height;    /* possibly off by one? */
+        InvalidateRect(global_hwnd, &rect, FALSE);
+        UpdateWindow(global_hwnd);     /* similar to XFlush() */
+    }
+
+/*
+    last param determines whether or not background is wiped before paint
+    InvalidateRect(global_hwnd, NULL, TRUE);
+    UpdateWindow(global_hwnd);
+ */
+
+    return 0;
+}
+
+
+
+
+
+static void rpng_win_cleanup()
+{
+    if (image_data) {
+        free(image_data);
+        image_data = NULL;
+    }
+
+    if (dib) {
+        free(dib);
+        dib = NULL;
+    }
+}
+
+
+
+
+
+LRESULT CALLBACK rpng_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
+{
+    HDC         hdc;
+    PAINTSTRUCT ps;
+    int rc;
+
+    switch (iMsg) {
+        case WM_CREATE:
+            /* one-time processing here, if any */
+            return 0;
+
+        case WM_PAINT:
+            hdc = BeginPaint(hwnd, &ps);
+                    /*                    dest                          */
+            rc = StretchDIBits(hdc, 0, 0, image_width, image_height,
+                    /*                    source                        */
+                                    0, 0, image_width, image_height,
+                                    wimage_data, (BITMAPINFO *)bmih,
+                    /*              iUsage: no clue                     */
+                                    0, SRCCOPY);
+            EndPaint(hwnd, &ps);
+            return 0;
+
+        /* wait for the user to tell us when to quit */
+        case WM_CHAR:
+            switch (wP) {      /* only need one, so ignore repeat count */
+                case 'q':
+                case 'Q':
+                case 0x1B:     /* Esc key */
+                    PostQuitMessage(0);
+            }
+            return 0;
+
+        case WM_LBUTTONDOWN:   /* another way of quitting */
+        case WM_DESTROY:
+            PostQuitMessage(0);
+            return 0;
+    }
+
+    return DefWindowProc(hwnd, iMsg, wP, lP);
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c
index fc8be88..6d10e1b 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng-x.c
@@ -1,904 +1,904 @@
-/*---------------------------------------------------------------------------

-

-   rpng - simple PNG display program                               rpng-x.c

-

-   This program decodes and displays PNG images, with gamma correction and

-   optionally with a user-specified background color (in case the image has

-   transparency).  It is very nearly the most basic PNG viewer possible.

-   This version is for the X Window System (tested by author under Unix and

-   by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).

-

-   to do:

-    - 8-bit (colormapped) X support

-    - use %.1023s to simplify truncation of title-bar string?

-

-  ---------------------------------------------------------------------------

-

-   Changelog:

-    - 1.01:  initial public release

-    - 1.02:  modified to allow abbreviated options; fixed long/ulong mis-

-              match; switched to png_jmpbuf() macro

-    - 1.10:  added support for non-default visuals; fixed X pixel-conversion

-    - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed

-              command-line parsing bug

-    - 1.12:  fixed some small X memory leaks (thanks to François Petitjean)

-    - 1.13:  fixed XFreeGC() crash bug (thanks to Patrick Welche)

-    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)

-    - 2.00:  dual-licensed (added GNU GPL)

-    - 2.01:  fixed improper display of usage screen on PNG error(s)

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#define PROGNAME  "rpng-x"

-#define LONGNAME  "Simple PNG Viewer for X"

-#define VERSION   "2.01 of 16 March 2008"

-#define RESNAME   "rpng"        /* our X resource application name */

-#define RESCLASS  "Rpng"        /* our X resource class name */

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <string.h>

-#include <time.h>

-#include <X11/Xlib.h>

-#include <X11/Xutil.h>

-#include <X11/Xos.h>

-#include <X11/keysym.h>

-

-/* #define DEBUG  :  this enables the Trace() macros */

-

-#include "readpng.h"   /* typedefs, common macros, readpng prototypes */

-

-

-/* could just include png.h, but this macro is the only thing we need

- * (name and typedefs changed to local versions); note that side effects

- * only happen with alpha (which could easily be avoided with

- * "ush acopy = (alpha);") */

-

-#define alpha_composite(composite, fg, alpha, bg) {               \

-    ush temp = ((ush)(fg)*(ush)(alpha) +                          \

-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \

-    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \

-}

-

-

-/* local prototypes */

-static int  rpng_x_create_window(void);

-static int  rpng_x_display_image(void);

-static void rpng_x_cleanup(void);

-static int  rpng_x_msb(ulg u32val);

-

-

-static char titlebar[1024], *window_name = titlebar;

-static char *appname = LONGNAME;

-static char *icon_name = PROGNAME;

-static char *res_name = RESNAME;

-static char *res_class = RESCLASS;

-static char *filename;

-static FILE *infile;

-

-static char *bgstr;

-static uch bg_red=0, bg_green=0, bg_blue=0;

-

-static double display_exponent;

-

-static ulg image_width, image_height, image_rowbytes;

-static int image_channels;

-static uch *image_data;

-

-/* X-specific variables */

-static char *displayname;

-static XImage *ximage;

-static Display *display;

-static int depth;

-static Visual *visual;

-static XVisualInfo *visual_list;

-static int RShift, GShift, BShift;

-static ulg RMask, GMask, BMask;

-static Window window;

-static GC gc;

-static Colormap colormap;

-

-static int have_nondefault_visual = FALSE;

-static int have_colormap = FALSE;

-static int have_window = FALSE;

-static int have_gc = FALSE;

-/*

-ulg numcolors=0, pixels[256];

-ush reds[256], greens[256], blues[256];

- */

-

-

-

-

-int main(int argc, char **argv)

-{

-#ifdef sgi

-    char tmpline[80];

-#endif

-    char *p;

-    int rc, alen, flen;

-    int error = 0;

-    int have_bg = FALSE;

-    double LUT_exponent;               /* just the lookup table */

-    double CRT_exponent = 2.2;         /* just the monitor */

-    double default_display_exponent;   /* whole display system */

-    XEvent e;

-    KeySym k;

-

-

-    displayname = (char *)NULL;

-    filename = (char *)NULL;

-

-

-    /* First set the default value for our display-system exponent, i.e.,

-     * the product of the CRT exponent and the exponent corresponding to

-     * the frame-buffer's lookup table (LUT), if any.  This is not an

-     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird

-     * ones), but it should cover 99% of the current possibilities. */

-

-#if defined(NeXT)

-    LUT_exponent = 1.0 / 2.2;

-    /*

-    if (some_next_function_that_returns_gamma(&next_gamma))

-        LUT_exponent = 1.0 / next_gamma;

-     */

-#elif defined(sgi)

-    LUT_exponent = 1.0 / 1.7;

-    /* there doesn't seem to be any documented function to get the

-     * "gamma" value, so we do it the hard way */

-    infile = fopen("/etc/config/system.glGammaVal", "r");

-    if (infile) {

-        double sgi_gamma;

-

-        fgets(tmpline, 80, infile);

-        fclose(infile);

-        sgi_gamma = atof(tmpline);

-        if (sgi_gamma > 0.0)

-            LUT_exponent = 1.0 / sgi_gamma;

-    }

-#elif defined(Macintosh)

-    LUT_exponent = 1.8 / 2.61;

-    /*

-    if (some_mac_function_that_returns_gamma(&mac_gamma))

-        LUT_exponent = mac_gamma / 2.61;

-     */

-#else

-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */

-#endif

-

-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */

-    default_display_exponent = LUT_exponent * CRT_exponent;

-

-

-    /* If the user has set the SCREEN_GAMMA environment variable as suggested

-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise

-     * use the default value we just calculated.  Either way, the user may

-     * override this via a command-line option. */

-

-    if ((p = getenv("SCREEN_GAMMA")) != NULL)

-        display_exponent = atof(p);

-    else

-        display_exponent = default_display_exponent;

-

-

-    /* Now parse the command line for options and the PNG filename. */

-

-    while (*++argv && !error) {

-        if (!strncmp(*argv, "-display", 2)) {

-            if (!*++argv)

-                ++error;

-            else

-                displayname = *argv;

-        } else if (!strncmp(*argv, "-gamma", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                display_exponent = atof(*argv);

-                if (display_exponent <= 0.0)

-                    ++error;

-            }

-        } else if (!strncmp(*argv, "-bgcolor", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                bgstr = *argv;

-                if (strlen(bgstr) != 7 || bgstr[0] != '#')

-                    ++error;

-                else

-                    have_bg = TRUE;

-            }

-        } else {

-            if (**argv != '-') {

-                filename = *argv;

-                if (argv[1])   /* shouldn't be any more args after filename */

-                    ++error;

-            } else

-                ++error;   /* not expecting any other options */

-        }

-    }

-

-    if (!filename)

-        ++error;

-

-

-    /* print usage screen if any errors up to this point */

-

-    if (error) {

-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);

-        readpng_version_info();

-        fprintf(stderr, "\n"

-          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"

-          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"

-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"

-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"

-          "\t\t  to the product of the lookup-table exponent (varies)\n"

-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"

-          "    bg  \tdesired background color in 7-character hex RGB format\n"

-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"

-          "\t\t  used with transparent images\n"

-          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"

-          "is displayed) to quit.\n"

-          "\n", PROGNAME, default_display_exponent);

-        exit(1);

-    }

-

-

-    if (!(infile = fopen(filename, "rb"))) {

-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);

-        ++error;

-    } else {

-        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {

-            switch (rc) {

-                case 1:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] is not a PNG file: incorrect signature\n",

-                      filename);

-                    break;

-                case 2:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);

-                    break;

-                case 4:

-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");

-                    break;

-                default:

-                    fprintf(stderr, PROGNAME

-                      ":  unknown readpng_init() error\n");

-                    break;

-            }

-            ++error;

-        } else {

-            display = XOpenDisplay(displayname);

-            if (!display) {

-                readpng_cleanup(TRUE);

-                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",

-                  displayname? displayname : "default");

-                ++error;

-            }

-        }

-        if (error)

-            fclose(infile);

-    }

-

-

-    if (error) {

-        fprintf(stderr, PROGNAME ":  aborting.\n");

-        exit(2);

-    }

-

-

-    /* set the title-bar string, but make sure buffer doesn't overflow */

-

-    alen = strlen(appname);

-    flen = strlen(filename);

-    if (alen + flen + 3 > 1023)

-        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));

-    else

-        sprintf(titlebar, "%s:  %s", appname, filename);

-

-

-    /* if the user didn't specify a background color on the command line,

-     * check for one in the PNG file--if not, the initialized values of 0

-     * (black) will be used */

-

-    if (have_bg) {

-        unsigned r, g, b;   /* this approach quiets compiler warnings */

-

-        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);

-        bg_red   = (uch)r;

-        bg_green = (uch)g;

-        bg_blue  = (uch)b;

-    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {

-        readpng_cleanup(TRUE);

-        fprintf(stderr, PROGNAME

-          ":  libpng error while checking for background color\n");

-        exit(2);

-    }

-

-

-    /* do the basic X initialization stuff, make the window and fill it

-     * with the background color */

-

-    if (rpng_x_create_window())

-        exit(2);

-

-

-    /* decode the image, all at once */

-

-    Trace((stderr, "calling readpng_get_image()\n"))

-    image_data = readpng_get_image(display_exponent, &image_channels,

-      &image_rowbytes);

-    Trace((stderr, "done with readpng_get_image()\n"))

-

-

-    /* done with PNG file, so clean up to minimize memory usage (but do NOT

-     * nuke image_data!) */

-

-    readpng_cleanup(FALSE);

-    fclose(infile);

-

-    if (!image_data) {

-        fprintf(stderr, PROGNAME ":  unable to decode PNG image\n");

-        exit(3);

-    }

-

-

-    /* display image (composite with background if requested) */

-

-    Trace((stderr, "calling rpng_x_display_image()\n"))

-    if (rpng_x_display_image()) {

-        free(image_data);

-        exit(4);

-    }

-    Trace((stderr, "done with rpng_x_display_image()\n"))

-

-

-    /* wait for the user to tell us when to quit */

-

-    printf(

-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");

-    fflush(stdout);

-

-    do

-        XNextEvent(display, &e);

-    while (!(e.type == ButtonPress && e.xbutton.button == Button1) &&

-           !(e.type == KeyPress &&    /*  v--- or 1 for shifted keys */

-             ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) ));

-

-

-    /* OK, we're done:  clean up all image and X resources and go away */

-

-    rpng_x_cleanup();

-

-    return 0;

-}

-

-

-

-

-

-static int rpng_x_create_window(void)

-{

-    uch *xdata;

-    int need_colormap = FALSE;

-    int screen, pad;

-    ulg bg_pixel = 0L;

-    ulg attrmask;

-    Window root;

-    XEvent e;

-    XGCValues gcvalues;

-    XSetWindowAttributes attr;

-    XTextProperty windowName, *pWindowName = &windowName;

-    XTextProperty iconName, *pIconName = &iconName;

-    XVisualInfo visual_info;

-    XSizeHints *size_hints;

-    XWMHints *wm_hints;

-    XClassHint *class_hints;

-

-

-    screen = DefaultScreen(display);

-    depth = DisplayPlanes(display, screen);

-    root = RootWindow(display, screen);

-

-#ifdef DEBUG

-    XSynchronize(display, True);

-#endif

-

-#if 0

-/* GRR:  add 8-bit support */

-    if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {

-        fprintf(stderr,

-          "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n",

-          depth);

-        return 2;

-    }

-

-    XMatchVisualInfo(display, screen, depth,

-      (depth == 8)? PseudoColor : TrueColor, &visual_info);

-    visual = visual_info.visual;

-#else

-    if (depth != 16 && depth != 24 && depth != 32) {

-        int visuals_matched = 0;

-

-        Trace((stderr, "default depth is %d:  checking other visuals\n",

-          depth))

-

-        /* 24-bit first */

-        visual_info.screen = screen;

-        visual_info.depth = 24;

-        visual_list = XGetVisualInfo(display,

-          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);

-        if (visuals_matched == 0) {

-/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */

-            fprintf(stderr, "default screen depth %d not supported, and no"

-              " 24-bit visuals found\n", depth);

-            return 2;

-        }

-        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",

-          visuals_matched))

-        visual = visual_list[0].visual;

-        depth = visual_list[0].depth;

-/*

-        colormap_size = visual_list[0].colormap_size;

-        visual_class = visual->class;

-        visualID = XVisualIDFromVisual(visual);

- */

-        have_nondefault_visual = TRUE;

-        need_colormap = TRUE;

-    } else {

-        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);

-        visual = visual_info.visual;

-    }

-#endif

-

-    RMask = visual->red_mask;

-    GMask = visual->green_mask;

-    BMask = visual->blue_mask;

-

-/* GRR:  add/check 8-bit support */

-    if (depth == 8 || need_colormap) {

-        colormap = XCreateColormap(display, root, visual, AllocNone);

-        if (!colormap) {

-            fprintf(stderr, "XCreateColormap() failed\n");

-            return 2;

-        }

-        have_colormap = TRUE;

-    }

-    if (depth == 15 || depth == 16) {

-        RShift = 15 - rpng_x_msb(RMask);    /* these are right-shifts */

-        GShift = 15 - rpng_x_msb(GMask);

-        BShift = 15 - rpng_x_msb(BMask);

-    } else if (depth > 16) {

-#define NO_24BIT_MASKS

-#ifdef NO_24BIT_MASKS

-        RShift = rpng_x_msb(RMask) - 7;     /* these are left-shifts */

-        GShift = rpng_x_msb(GMask) - 7;

-        BShift = rpng_x_msb(BMask) - 7;

-#else

-        RShift = 7 - rpng_x_msb(RMask);     /* these are right-shifts, too */

-        GShift = 7 - rpng_x_msb(GMask);

-        BShift = 7 - rpng_x_msb(BMask);

-#endif

-    }

-    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {

-        fprintf(stderr, "rpng internal logic error:  negative X shift(s)!\n");

-        return 2;

-    }

-

-/*---------------------------------------------------------------------------

-    Finally, create the window.

-  ---------------------------------------------------------------------------*/

-

-    attr.backing_store = Always;

-    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;

-    attrmask = CWBackingStore | CWEventMask;

-    if (have_nondefault_visual) {

-        attr.colormap = colormap;

-        attr.background_pixel = 0;

-        attr.border_pixel = 1;

-        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;

-    }

-

-    window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0,

-      depth, InputOutput, visual, attrmask, &attr);

-

-    if (window == None) {

-        fprintf(stderr, "XCreateWindow() failed\n");

-        return 2;

-    } else

-        have_window = TRUE;

-

-    if (depth == 8)

-        XSetWindowColormap(display, window, colormap);

-

-    if (!XStringListToTextProperty(&window_name, 1, pWindowName))

-        pWindowName = NULL;

-    if (!XStringListToTextProperty(&icon_name, 1, pIconName))

-        pIconName = NULL;

-

-    /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */

-

-    if ((size_hints = XAllocSizeHints()) != NULL) {

-        /* window will not be resizable */

-        size_hints->flags = PMinSize | PMaxSize;

-        size_hints->min_width = size_hints->max_width = (int)image_width;

-        size_hints->min_height = size_hints->max_height = (int)image_height;

-    }

-

-    if ((wm_hints = XAllocWMHints()) != NULL) {

-        wm_hints->initial_state = NormalState;

-        wm_hints->input = True;

-     /* wm_hints->icon_pixmap = icon_pixmap; */

-        wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;

-    }

-

-    if ((class_hints = XAllocClassHint()) != NULL) {

-        class_hints->res_name = res_name;

-        class_hints->res_class = res_class;

-    }

-

-    XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,

-      size_hints, wm_hints, class_hints);

-

-    /* various properties and hints no longer needed; free memory */

-    if (pWindowName)

-       XFree(pWindowName->value);

-    if (pIconName)

-       XFree(pIconName->value);

-    if (size_hints)

-        XFree(size_hints);

-    if (wm_hints)

-       XFree(wm_hints);

-    if (class_hints)

-       XFree(class_hints);

-

-    XMapWindow(display, window);

-

-    gc = XCreateGC(display, window, 0, &gcvalues);

-    have_gc = TRUE;

-

-/*---------------------------------------------------------------------------

-    Fill window with the specified background color.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        bg_pixel = ((ulg)bg_red   << RShift) |

-                   ((ulg)bg_green << GShift) |

-                   ((ulg)bg_blue  << BShift);

-    } else if (depth == 16) {

-        bg_pixel = ((((ulg)bg_red   << 8) >> RShift) & RMask) |

-                   ((((ulg)bg_green << 8) >> GShift) & GMask) |

-                   ((((ulg)bg_blue  << 8) >> BShift) & BMask);

-    } else /* depth == 8 */ {

-

-        /* GRR:  add 8-bit support */

-

-    }

-

-    XSetForeground(display, gc, bg_pixel);

-    XFillRectangle(display, window, gc, 0, 0, image_width, image_height);

-

-/*---------------------------------------------------------------------------

-    Wait for first Expose event to do any drawing, then flush.

-  ---------------------------------------------------------------------------*/

-

-    do

-        XNextEvent(display, &e);

-    while (e.type != Expose || e.xexpose.count);

-

-    XFlush(display);

-

-/*---------------------------------------------------------------------------

-    Allocate memory for the X- and display-specific version of the image.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        xdata = (uch *)malloc(4*image_width*image_height);

-        pad = 32;

-    } else if (depth == 16) {

-        xdata = (uch *)malloc(2*image_width*image_height);

-        pad = 16;

-    } else /* depth == 8 */ {

-        xdata = (uch *)malloc(image_width*image_height);

-        pad = 8;

-    }

-

-    if (!xdata) {

-        fprintf(stderr, PROGNAME ":  unable to allocate image memory\n");

-        return 4;

-    }

-

-    ximage = XCreateImage(display, visual, depth, ZPixmap, 0,

-      (char *)xdata, image_width, image_height, pad, 0);

-

-    if (!ximage) {

-        fprintf(stderr, PROGNAME ":  XCreateImage() failed\n");

-        free(xdata);

-        return 3;

-    }

-

-    /* to avoid testing the byte order every pixel (or doubling the size of

-     * the drawing routine with a giant if-test), we arbitrarily set the byte

-     * order to MSBFirst and let Xlib worry about inverting things on little-

-     * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most

-     * efficient approach (the giant if-test would be better), but in the

-     * interest of clarity, we take the easy way out... */

-

-    ximage->byte_order = MSBFirst;

-

-    return 0;

-

-} /* end function rpng_x_create_window() */

-

-

-

-

-

-static int rpng_x_display_image(void)

-{

-    uch *src;

-    char *dest;

-    uch r, g, b, a;

-    ulg i, row, lastrow = 0;

-    ulg pixel;

-    int ximage_rowbytes = ximage->bytes_per_line;

-/*  int bpp = ximage->bits_per_pixel;  */

-

-

-    Trace((stderr, "beginning display loop (image_channels == %d)\n",

-      image_channels))

-    Trace((stderr, "   (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",

-      image_width, image_rowbytes, ximage_rowbytes))

-    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))

-    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?

-      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))

-

-    if (depth == 24 || depth == 32) {

-        ulg red, green, blue;

-

-        for (lastrow = row = 0;  row < image_height;  ++row) {

-            src = image_data + row*image_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            if (image_channels == 3) {

-                for (i = image_width;  i > 0;  --i) {

-                    red   = *src++;

-                    green = *src++;

-                    blue  = *src++;

-#ifdef NO_24BIT_MASKS

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    /* GRR BUG:  this assumes bpp == 32, but may be 24: */

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-#else

-                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;

-                    green = (GShift < 0)? green << (-GShift) : green >> GShift;

-                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;

-                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-#endif

-                }

-            } else /* if (image_channels == 4) */ {

-                for (i = image_width;  i > 0;  --i) {

-                    r = *src++;

-                    g = *src++;

-                    b = *src++;

-                    a = *src++;

-                    if (a == 255) {

-                        red   = r;

-                        green = g;

-                        blue  = b;

-                    } else if (a == 0) {

-                        red   = bg_red;

-                        green = bg_green;

-                        blue  = bg_blue;

-                    } else {

-                        /* this macro (from png.h) composites the foreground

-                         * and background values and puts the result into the

-                         * first argument */

-                        alpha_composite(red,   r, a, bg_red);

-                        alpha_composite(green, g, a, bg_green);

-                        alpha_composite(blue,  b, a, bg_blue);

-                    }

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-            /* display after every 16 lines */

-            if (((row+1) & 0xf) == 0) {

-                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-                  (int)lastrow, image_width, 16);

-                XFlush(display);

-                lastrow = row + 1;

-            }

-        }

-

-    } else if (depth == 16) {

-        ush red, green, blue;

-

-        for (lastrow = row = 0;  row < image_height;  ++row) {

-            src = image_data + row*image_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            if (image_channels == 3) {

-                for (i = image_width;  i > 0;  --i) {

-                    red   = ((ush)(*src) << 8);

-                    ++src;

-                    green = ((ush)(*src) << 8);

-                    ++src;

-                    blue  = ((ush)(*src) << 8);

-                    ++src;

-                    pixel = ((red   >> RShift) & RMask) |

-                            ((green >> GShift) & GMask) |

-                            ((blue  >> BShift) & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            } else /* if (image_channels == 4) */ {

-                for (i = image_width;  i > 0;  --i) {

-                    r = *src++;

-                    g = *src++;

-                    b = *src++;

-                    a = *src++;

-                    if (a == 255) {

-                        red   = ((ush)r << 8);

-                        green = ((ush)g << 8);

-                        blue  = ((ush)b << 8);

-                    } else if (a == 0) {

-                        red   = ((ush)bg_red   << 8);

-                        green = ((ush)bg_green << 8);

-                        blue  = ((ush)bg_blue  << 8);

-                    } else {

-                        /* this macro (from png.h) composites the foreground

-                         * and background values and puts the result back into

-                         * the first argument (== fg byte here:  safe) */

-                        alpha_composite(r, r, a, bg_red);

-                        alpha_composite(g, g, a, bg_green);

-                        alpha_composite(b, b, a, bg_blue);

-                        red   = ((ush)r << 8);

-                        green = ((ush)g << 8);

-                        blue  = ((ush)b << 8);

-                    }

-                    pixel = ((red   >> RShift) & RMask) |

-                            ((green >> GShift) & GMask) |

-                            ((blue  >> BShift) & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-            /* display after every 16 lines */

-            if (((row+1) & 0xf) == 0) {

-                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-                  (int)lastrow, image_width, 16);

-                XFlush(display);

-                lastrow = row + 1;

-            }

-        }

-

-    } else /* depth == 8 */ {

-

-        /* GRR:  add 8-bit support */

-

-    }

-

-    Trace((stderr, "calling final XPutImage()\n"))

-    if (lastrow < image_height) {

-        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-          (int)lastrow, image_width, image_height-lastrow);

-        XFlush(display);

-    }

-

-    return 0;

-}

-

-

-

-

-static void rpng_x_cleanup(void)

-{

-    if (image_data) {

-        free(image_data);

-        image_data = NULL;

-    }

-

-    if (ximage) {

-        if (ximage->data) {

-            free(ximage->data);           /* we allocated it, so we free it */

-            ximage->data = (char *)NULL;  /*  instead of XDestroyImage() */

-        }

-        XDestroyImage(ximage);

-        ximage = NULL;

-    }

-

-    if (have_gc)

-        XFreeGC(display, gc);

-

-    if (have_window)

-        XDestroyWindow(display, window);

-

-    if (have_colormap)

-        XFreeColormap(display, colormap);

-

-    if (have_nondefault_visual)

-        XFree(visual_list);

-}

-

-

-

-

-

-static int rpng_x_msb(ulg u32val)

-{

-    int i;

-

-    for (i = 31;  i >= 0;  --i) {

-        if (u32val & 0x80000000L)

-            break;

-        u32val <<= 1;

-    }

-    return i;

-}

+/*---------------------------------------------------------------------------
+
+   rpng - simple PNG display program                               rpng-x.c
+
+   This program decodes and displays PNG images, with gamma correction and
+   optionally with a user-specified background color (in case the image has
+   transparency).  It is very nearly the most basic PNG viewer possible.
+   This version is for the X Window System (tested by author under Unix and
+   by Martin Zinser under OpenVMS; may work under OS/2 with some tweaking).
+
+   to do:
+    - 8-bit (colormapped) X support
+    - use %.1023s to simplify truncation of title-bar string?
+
+  ---------------------------------------------------------------------------
+
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed long/ulong mis-
+              match; switched to png_jmpbuf() macro
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added extra set of parentheses to png_jmpbuf() macro; fixed
+              command-line parsing bug
+    - 1.12:  fixed some small X memory leaks (thanks to François Petitjean)
+    - 1.13:  fixed XFreeGC() crash bug (thanks to Patrick Welche)
+    - 1.14:  added support for X resources (thanks to Gerhard Niklasch)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed improper display of usage screen on PNG error(s)
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#define PROGNAME  "rpng-x"
+#define LONGNAME  "Simple PNG Viewer for X"
+#define VERSION   "2.01 of 16 March 2008"
+#define RESNAME   "rpng"        /* our X resource application name */
+#define RESCLASS  "Rpng"        /* our X resource class name */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xos.h>
+#include <X11/keysym.h>
+
+/* #define DEBUG  :  this enables the Trace() macros */
+
+#include "readpng.h"   /* typedefs, common macros, readpng prototypes */
+
+
+/* could just include png.h, but this macro is the only thing we need
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
+ * "ush acopy = (alpha);") */
+
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
+}
+
+
+/* local prototypes */
+static int  rpng_x_create_window(void);
+static int  rpng_x_display_image(void);
+static void rpng_x_cleanup(void);
+static int  rpng_x_msb(ulg u32val);
+
+
+static char titlebar[1024], *window_name = titlebar;
+static char *appname = LONGNAME;
+static char *icon_name = PROGNAME;
+static char *res_name = RESNAME;
+static char *res_class = RESCLASS;
+static char *filename;
+static FILE *infile;
+
+static char *bgstr;
+static uch bg_red=0, bg_green=0, bg_blue=0;
+
+static double display_exponent;
+
+static ulg image_width, image_height, image_rowbytes;
+static int image_channels;
+static uch *image_data;
+
+/* X-specific variables */
+static char *displayname;
+static XImage *ximage;
+static Display *display;
+static int depth;
+static Visual *visual;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
+static Window window;
+static GC gc;
+static Colormap colormap;
+
+static int have_nondefault_visual = FALSE;
+static int have_colormap = FALSE;
+static int have_window = FALSE;
+static int have_gc = FALSE;
+/*
+ulg numcolors=0, pixels[256];
+ush reds[256], greens[256], blues[256];
+ */
+
+
+
+
+int main(int argc, char **argv)
+{
+#ifdef sgi
+    char tmpline[80];
+#endif
+    char *p;
+    int rc, alen, flen;
+    int error = 0;
+    int have_bg = FALSE;
+    double LUT_exponent;               /* just the lookup table */
+    double CRT_exponent = 2.2;         /* just the monitor */
+    double default_display_exponent;   /* whole display system */
+    XEvent e;
+    KeySym k;
+
+
+    displayname = (char *)NULL;
+    filename = (char *)NULL;
+
+
+    /* First set the default value for our display-system exponent, i.e.,
+     * the product of the CRT exponent and the exponent corresponding to
+     * the frame-buffer's lookup table (LUT), if any.  This is not an
+     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
+     * ones), but it should cover 99% of the current possibilities. */
+
+#if defined(NeXT)
+    LUT_exponent = 1.0 / 2.2;
+    /*
+    if (some_next_function_that_returns_gamma(&next_gamma))
+        LUT_exponent = 1.0 / next_gamma;
+     */
+#elif defined(sgi)
+    LUT_exponent = 1.0 / 1.7;
+    /* there doesn't seem to be any documented function to get the
+     * "gamma" value, so we do it the hard way */
+    infile = fopen("/etc/config/system.glGammaVal", "r");
+    if (infile) {
+        double sgi_gamma;
+
+        fgets(tmpline, 80, infile);
+        fclose(infile);
+        sgi_gamma = atof(tmpline);
+        if (sgi_gamma > 0.0)
+            LUT_exponent = 1.0 / sgi_gamma;
+    }
+#elif defined(Macintosh)
+    LUT_exponent = 1.8 / 2.61;
+    /*
+    if (some_mac_function_that_returns_gamma(&mac_gamma))
+        LUT_exponent = mac_gamma / 2.61;
+     */
+#else
+    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
+#endif
+
+    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+    default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+    /* If the user has set the SCREEN_GAMMA environment variable as suggested
+     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+     * use the default value we just calculated.  Either way, the user may
+     * override this via a command-line option. */
+
+    if ((p = getenv("SCREEN_GAMMA")) != NULL)
+        display_exponent = atof(p);
+    else
+        display_exponent = default_display_exponent;
+
+
+    /* Now parse the command line for options and the PNG filename. */
+
+    while (*++argv && !error) {
+        if (!strncmp(*argv, "-display", 2)) {
+            if (!*++argv)
+                ++error;
+            else
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                display_exponent = atof(*argv);
+                if (display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else
+                    have_bg = TRUE;
+            }
+        } else {
+            if (**argv != '-') {
+                filename = *argv;
+                if (argv[1])   /* shouldn't be any more args after filename */
+                    ++error;
+            } else
+                ++error;   /* not expecting any other options */
+        }
+    }
+
+    if (!filename)
+        ++error;
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+        readpng_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg] file.png\n"
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME, default_display_exponent);
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        if ((rc = readpng_init(infile, &image_width, &image_height)) != 0) {
+            switch (rc) {
+                case 1:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] is not a PNG file: incorrect signature\n",
+                      filename);
+                    break;
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng_init() error\n");
+                    break;
+            }
+            ++error;
+        } else {
+            display = XOpenDisplay(displayname);
+            if (!display) {
+                readpng_cleanup(TRUE);
+                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",
+                  displayname? displayname : "default");
+                ++error;
+            }
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        exit(2);
+    }
+
+
+    /* set the title-bar string, but make sure buffer doesn't overflow */
+
+    alen = strlen(appname);
+    flen = strlen(filename);
+    if (alen + flen + 3 > 1023)
+        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));
+    else
+        sprintf(titlebar, "%s:  %s", appname, filename);
+
+
+    /* if the user didn't specify a background color on the command line,
+     * check for one in the PNG file--if not, the initialized values of 0
+     * (black) will be used */
+
+    if (have_bg) {
+        unsigned r, g, b;   /* this approach quiets compiler warnings */
+
+        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+        bg_red   = (uch)r;
+        bg_green = (uch)g;
+        bg_blue  = (uch)b;
+    } else if (readpng_get_bgcolor(&bg_red, &bg_green, &bg_blue) > 1) {
+        readpng_cleanup(TRUE);
+        fprintf(stderr, PROGNAME
+          ":  libpng error while checking for background color\n");
+        exit(2);
+    }
+
+
+    /* do the basic X initialization stuff, make the window and fill it
+     * with the background color */
+
+    if (rpng_x_create_window())
+        exit(2);
+
+
+    /* decode the image, all at once */
+
+    Trace((stderr, "calling readpng_get_image()\n"))
+    image_data = readpng_get_image(display_exponent, &image_channels,
+      &image_rowbytes);
+    Trace((stderr, "done with readpng_get_image()\n"))
+
+
+    /* done with PNG file, so clean up to minimize memory usage (but do NOT
+     * nuke image_data!) */
+
+    readpng_cleanup(FALSE);
+    fclose(infile);
+
+    if (!image_data) {
+        fprintf(stderr, PROGNAME ":  unable to decode PNG image\n");
+        exit(3);
+    }
+
+
+    /* display image (composite with background if requested) */
+
+    Trace((stderr, "calling rpng_x_display_image()\n"))
+    if (rpng_x_display_image()) {
+        free(image_data);
+        exit(4);
+    }
+    Trace((stderr, "done with rpng_x_display_image()\n"))
+
+
+    /* wait for the user to tell us when to quit */
+
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+
+    do
+        XNextEvent(display, &e);
+    while (!(e.type == ButtonPress && e.xbutton.button == Button1) &&
+           !(e.type == KeyPress &&    /*  v--- or 1 for shifted keys */
+             ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape) ));
+
+
+    /* OK, we're done:  clean up all image and X resources and go away */
+
+    rpng_x_cleanup();
+
+    return 0;
+}
+
+
+
+
+
+static int rpng_x_create_window(void)
+{
+    uch *xdata;
+    int need_colormap = FALSE;
+    int screen, pad;
+    ulg bg_pixel = 0L;
+    ulg attrmask;
+    Window root;
+    XEvent e;
+    XGCValues gcvalues;
+    XSetWindowAttributes attr;
+    XTextProperty windowName, *pWindowName = &windowName;
+    XTextProperty iconName, *pIconName = &iconName;
+    XVisualInfo visual_info;
+    XSizeHints *size_hints;
+    XWMHints *wm_hints;
+    XClassHint *class_hints;
+
+
+    screen = DefaultScreen(display);
+    depth = DisplayPlanes(display, screen);
+    root = RootWindow(display, screen);
+
+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+#if 0
+/* GRR:  add 8-bit support */
+    if (/* depth != 8 && */ depth != 16 && depth != 24 && depth != 32) {
+        fprintf(stderr,
+          "screen depth %d not supported (only 16-, 24- or 32-bit TrueColor)\n",
+          depth);
+        return 2;
+    }
+
+    XMatchVisualInfo(display, screen, depth,
+      (depth == 8)? PseudoColor : TrueColor, &visual_info);
+    visual = visual_info.visual;
+#else
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;
+
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
+    }
+#endif
+
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;
+
+/* GRR:  add/check 8-bit support */
+    if (depth == 8 || need_colormap) {
+        colormap = XCreateColormap(display, root, visual, AllocNone);
+        if (!colormap) {
+            fprintf(stderr, "XCreateColormap() failed\n");
+            return 2;
+        }
+        have_colormap = TRUE;
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng_x_msb(GMask);
+        BShift = 15 - rpng_x_msb(BMask);
+    } else if (depth > 16) {
+#define NO_24BIT_MASKS
+#ifdef NO_24BIT_MASKS
+        RShift = rpng_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng_x_msb(GMask) - 7;
+        BShift = rpng_x_msb(BMask) - 7;
+#else
+        RShift = 7 - rpng_x_msb(RMask);     /* these are right-shifts, too */
+        GShift = 7 - rpng_x_msb(GMask);
+        BShift = 7 - rpng_x_msb(BMask);
+#endif
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng internal logic error:  negative X shift(s)!\n");
+        return 2;
+    }
+
+/*---------------------------------------------------------------------------
+    Finally, create the window.
+  ---------------------------------------------------------------------------*/
+
+    attr.backing_store = Always;
+    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }
+
+    window = XCreateWindow(display, root, 0, 0, image_width, image_height, 0,
+      depth, InputOutput, visual, attrmask, &attr);
+
+    if (window == None) {
+        fprintf(stderr, "XCreateWindow() failed\n");
+        return 2;
+    } else
+        have_window = TRUE;
+
+    if (depth == 8)
+        XSetWindowColormap(display, window, colormap);
+
+    if (!XStringListToTextProperty(&window_name, 1, pWindowName))
+        pWindowName = NULL;
+    if (!XStringListToTextProperty(&icon_name, 1, pIconName))
+        pIconName = NULL;
+
+    /* OK if any hints allocation fails; XSetWMProperties() allows NULLs */
+
+    if ((size_hints = XAllocSizeHints()) != NULL) {
+        /* window will not be resizable */
+        size_hints->flags = PMinSize | PMaxSize;
+        size_hints->min_width = size_hints->max_width = (int)image_width;
+        size_hints->min_height = size_hints->max_height = (int)image_height;
+    }
+
+    if ((wm_hints = XAllocWMHints()) != NULL) {
+        wm_hints->initial_state = NormalState;
+        wm_hints->input = True;
+     /* wm_hints->icon_pixmap = icon_pixmap; */
+        wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;
+    }
+
+    if ((class_hints = XAllocClassHint()) != NULL) {
+        class_hints->res_name = res_name;
+        class_hints->res_class = res_class;
+    }
+
+    XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
+      size_hints, wm_hints, class_hints);
+
+    /* various properties and hints no longer needed; free memory */
+    if (pWindowName)
+       XFree(pWindowName->value);
+    if (pIconName)
+       XFree(pIconName->value);
+    if (size_hints)
+        XFree(size_hints);
+    if (wm_hints)
+       XFree(wm_hints);
+    if (class_hints)
+       XFree(class_hints);
+
+    XMapWindow(display, window);
+
+    gc = XCreateGC(display, window, 0, &gcvalues);
+    have_gc = TRUE;
+
+/*---------------------------------------------------------------------------
+    Fill window with the specified background color.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        bg_pixel = ((ulg)bg_red   << RShift) |
+                   ((ulg)bg_green << GShift) |
+                   ((ulg)bg_blue  << BShift);
+    } else if (depth == 16) {
+        bg_pixel = ((((ulg)bg_red   << 8) >> RShift) & RMask) |
+                   ((((ulg)bg_green << 8) >> GShift) & GMask) |
+                   ((((ulg)bg_blue  << 8) >> BShift) & BMask);
+    } else /* depth == 8 */ {
+
+        /* GRR:  add 8-bit support */
+
+    }
+
+    XSetForeground(display, gc, bg_pixel);
+    XFillRectangle(display, window, gc, 0, 0, image_width, image_height);
+
+/*---------------------------------------------------------------------------
+    Wait for first Expose event to do any drawing, then flush.
+  ---------------------------------------------------------------------------*/
+
+    do
+        XNextEvent(display, &e);
+    while (e.type != Expose || e.xexpose.count);
+
+    XFlush(display);
+
+/*---------------------------------------------------------------------------
+    Allocate memory for the X- and display-specific version of the image.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        xdata = (uch *)malloc(4*image_width*image_height);
+        pad = 32;
+    } else if (depth == 16) {
+        xdata = (uch *)malloc(2*image_width*image_height);
+        pad = 16;
+    } else /* depth == 8 */ {
+        xdata = (uch *)malloc(image_width*image_height);
+        pad = 8;
+    }
+
+    if (!xdata) {
+        fprintf(stderr, PROGNAME ":  unable to allocate image memory\n");
+        return 4;
+    }
+
+    ximage = XCreateImage(display, visual, depth, ZPixmap, 0,
+      (char *)xdata, image_width, image_height, pad, 0);
+
+    if (!ximage) {
+        fprintf(stderr, PROGNAME ":  XCreateImage() failed\n");
+        free(xdata);
+        return 3;
+    }
+
+    /* to avoid testing the byte order every pixel (or doubling the size of
+     * the drawing routine with a giant if-test), we arbitrarily set the byte
+     * order to MSBFirst and let Xlib worry about inverting things on little-
+     * endian machines (like Linux/x86, old VAXen, etc.)--this is not the most
+     * efficient approach (the giant if-test would be better), but in the
+     * interest of clarity, we take the easy way out... */
+
+    ximage->byte_order = MSBFirst;
+
+    return 0;
+
+} /* end function rpng_x_create_window() */
+
+
+
+
+
+static int rpng_x_display_image(void)
+{
+    uch *src;
+    char *dest;
+    uch r, g, b, a;
+    ulg i, row, lastrow = 0;
+    ulg pixel;
+    int ximage_rowbytes = ximage->bytes_per_line;
+/*  int bpp = ximage->bits_per_pixel;  */
+
+
+    Trace((stderr, "beginning display loop (image_channels == %d)\n",
+      image_channels))
+    Trace((stderr, "   (width = %ld, rowbytes = %ld, ximage_rowbytes = %d)\n",
+      image_width, image_rowbytes, ximage_rowbytes))
+    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))
+    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?
+      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))
+
+    if (depth == 24 || depth == 32) {
+        ulg red, green, blue;
+
+        for (lastrow = row = 0;  row < image_height;  ++row) {
+            src = image_data + row*image_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            if (image_channels == 3) {
+                for (i = image_width;  i > 0;  --i) {
+                    red   = *src++;
+                    green = *src++;
+                    blue  = *src++;
+#ifdef NO_24BIT_MASKS
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    /* GRR BUG:  this assumes bpp == 32, but may be 24: */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#else
+                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;
+                    green = (GShift < 0)? green << (-GShift) : green >> GShift;
+                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;
+                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+#endif
+                }
+            } else /* if (image_channels == 4) */ {
+                for (i = image_width;  i > 0;  --i) {
+                    r = *src++;
+                    g = *src++;
+                    b = *src++;
+                    a = *src++;
+                    if (a == 255) {
+                        red   = r;
+                        green = g;
+                        blue  = b;
+                    } else if (a == 0) {
+                        red   = bg_red;
+                        green = bg_green;
+                        blue  = bg_blue;
+                    } else {
+                        /* this macro (from png.h) composites the foreground
+                         * and background values and puts the result into the
+                         * first argument */
+                        alpha_composite(red,   r, a, bg_red);
+                        alpha_composite(green, g, a, bg_green);
+                        alpha_composite(blue,  b, a, bg_blue);
+                    }
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+            /* display after every 16 lines */
+            if (((row+1) & 0xf) == 0) {
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
+                XFlush(display);
+                lastrow = row + 1;
+            }
+        }
+
+    } else if (depth == 16) {
+        ush red, green, blue;
+
+        for (lastrow = row = 0;  row < image_height;  ++row) {
+            src = image_data + row*image_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            if (image_channels == 3) {
+                for (i = image_width;  i > 0;  --i) {
+                    red   = ((ush)(*src) << 8);
+                    ++src;
+                    green = ((ush)(*src) << 8);
+                    ++src;
+                    blue  = ((ush)(*src) << 8);
+                    ++src;
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            } else /* if (image_channels == 4) */ {
+                for (i = image_width;  i > 0;  --i) {
+                    r = *src++;
+                    g = *src++;
+                    b = *src++;
+                    a = *src++;
+                    if (a == 255) {
+                        red   = ((ush)r << 8);
+                        green = ((ush)g << 8);
+                        blue  = ((ush)b << 8);
+                    } else if (a == 0) {
+                        red   = ((ush)bg_red   << 8);
+                        green = ((ush)bg_green << 8);
+                        blue  = ((ush)bg_blue  << 8);
+                    } else {
+                        /* this macro (from png.h) composites the foreground
+                         * and background values and puts the result back into
+                         * the first argument (== fg byte here:  safe) */
+                        alpha_composite(r, r, a, bg_red);
+                        alpha_composite(g, g, a, bg_green);
+                        alpha_composite(b, b, a, bg_blue);
+                        red   = ((ush)r << 8);
+                        green = ((ush)g << 8);
+                        blue  = ((ush)b << 8);
+                    }
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+            /* display after every 16 lines */
+            if (((row+1) & 0xf) == 0) {
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, image_width, 16);
+                XFlush(display);
+                lastrow = row + 1;
+            }
+        }
+
+    } else /* depth == 8 */ {
+
+        /* GRR:  add 8-bit support */
+
+    }
+
+    Trace((stderr, "calling final XPutImage()\n"))
+    if (lastrow < image_height) {
+        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+          (int)lastrow, image_width, image_height-lastrow);
+        XFlush(display);
+    }
+
+    return 0;
+}
+
+
+
+
+static void rpng_x_cleanup(void)
+{
+    if (image_data) {
+        free(image_data);
+        image_data = NULL;
+    }
+
+    if (ximage) {
+        if (ximage->data) {
+            free(ximage->data);           /* we allocated it, so we free it */
+            ximage->data = (char *)NULL;  /*  instead of XDestroyImage() */
+        }
+        XDestroyImage(ximage);
+        ximage = NULL;
+    }
+
+    if (have_gc)
+        XFreeGC(display, gc);
+
+    if (have_window)
+        XDestroyWindow(display, window);
+
+    if (have_colormap)
+        XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
+}
+
+
+
+
+
+static int rpng_x_msb(ulg u32val)
+{
+    int i;
+
+    for (i = 31;  i >= 0;  --i) {
+        if (u32val & 0x80000000L)
+            break;
+        u32val <<= 1;
+    }
+    return i;
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-win.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-win.c
index 2303b58..223e737 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-win.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-win.c
@@ -1,1253 +1,1253 @@
-/*---------------------------------------------------------------------------

-

-   rpng2 - progressive-model PNG display program                rpng2-win.c

-

-   This program decodes and displays PNG files progressively, as if it were

-   a web browser (though the front end is only set up to read from files).

-   It supports gamma correction, user-specified background colors, and user-

-   specified background patterns (for transparent images).  This version is

-   for 32-bit Windows; it may compile under 16-bit Windows with a little

-   tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der

-   Meulen for the "diamond" and "radial waves" patterns, respectively.

-

-   to do (someday, maybe):

-    - handle quoted command-line args (especially filenames with spaces)

-    - finish resizable checkerboard-gradient (sizes 4-128?)

-    - use %.1023s to simplify truncation of title-bar string?

-    - have minimum window width:  oh well

-

-  ---------------------------------------------------------------------------

-

-   Changelog:

-    - 1.01:  initial public release

-    - 1.02:  fixed cut-and-paste error in usage screen (oops...)

-    - 1.03:  modified to allow abbreviated options

-    - 1.04:  removed bogus extra argument from usage fprintf() [Glenn R-P?];

-              fixed command-line parsing bug

-    - 1.10:  enabled "message window"/console (thanks to David Geldreich)

-    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options

-    - 1.21:  made minor tweak to usage screen to fit within 25-line console

-    - 1.22:  added AMD64/EM64T support (__x86_64__)

-    - 2.00:  dual-licensed (added GNU GPL)

-    - 2.01:  fixed 64-bit typo in readpng2.c

-    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed

-              unexpected-EOF and file-read-error cases

-    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#define PROGNAME  "rpng2-win"

-#define LONGNAME  "Progressive PNG Viewer for Windows"

-#define VERSION   "2.02 of 16 March 2008"

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <string.h>

-#include <setjmp.h>    /* for jmpbuf declaration in readpng2.h */

-#include <time.h>

-#include <math.h>      /* only for PvdM background code */

-#include <windows.h>

-#ifdef __CYGWIN__

-/* getch replacement. Turns out, we don't really need this,

- * but leave it here if we ever enable any of the uses of

- * _getch in the main code

- */

-#include <unistd.h>

-#include <termio.h>

-#include <sys/ioctl.h>

-int repl_getch( void )

-{

-  char ch;

-  int fd = fileno(stdin);

-  struct termio old_tty, new_tty;

-

-  ioctl(fd, TCGETA, &old_tty);

-  new_tty = old_tty;

-  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);

-  ioctl(fd, TCSETA, &new_tty);

-  fread(&ch, 1, sizeof(ch), stdin);

-  ioctl(fd, TCSETA, &old_tty);

-

-  return ch;

-}

-#define _getch repl_getch

-#else

-#include <conio.h>     /* only for _getch() */

-#endif

-

-/* all for PvdM background code: */

-#ifndef PI

-#  define PI             3.141592653589793238

-#endif

-#define PI_2             (PI*0.5)

-#define INV_PI_360       (360.0 / PI)

-#define MAX(a,b)         (a>b?a:b)

-#define MIN(a,b)         (a<b?a:b)

-#define CLIP(a,min,max)  MAX(min,MIN((a),max))

-#define ABS(a)           ((a)<0?-(a):(a))

-#define CLIP8P(c)        MAX(0,(MIN((c),255)))   /* 8-bit pos. integer (uch) */

-#define ROUNDF(f)        ((int)(f + 0.5))

-

-#define rgb1_max   bg_freq

-#define rgb1_min   bg_gray

-#define rgb2_max   bg_bsat

-#define rgb2_min   bg_brot

-

-/* #define DEBUG */     /* this enables the Trace() macros */

-

-#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */

-

-

-/* could just include png.h, but this macro is the only thing we need

- * (name and typedefs changed to local versions); note that side effects

- * only happen with alpha (which could easily be avoided with

- * "ush acopy = (alpha);") */

-

-#define alpha_composite(composite, fg, alpha, bg) {               \

-    ush temp = ((ush)(fg)*(ush)(alpha) +                          \

-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \

-    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \

-}

-

-

-#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this

-                          *  block size corresponds roughly to a download

-                          *  speed 10% faster than theoretical 33.6K maximum

-                          *  (assuming 8 data bits, 1 stop bit and no other

-                          *  overhead) */

-

-/* local prototypes */

-static void       rpng2_win_init(void);

-static int        rpng2_win_create_window(void);

-static int        rpng2_win_load_bg_image(void);

-static void       rpng2_win_display_row(ulg row);

-static void       rpng2_win_finish_display(void);

-static void       rpng2_win_cleanup(void);

-LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);

-

-

-static char titlebar[1024];

-static char *progname = PROGNAME;

-static char *appname = LONGNAME;

-static char *filename;

-static FILE *infile;

-

-static mainprog_info rpng2_info;

-

-static uch inbuf[INBUFSIZE];

-static int incount;

-

-static int pat = 6;         /* must be less than num_bgpat */

-static int bg_image = 0;

-static int bgscale = 16;

-static ulg bg_rowbytes;

-static uch *bg_data;

-

-static struct rgb_color {

-    uch r, g, b;

-} rgb[] = {

-    {  0,   0,   0},    /*  0:  black */

-    {255, 255, 255},    /*  1:  white */

-    {173, 132,  57},    /*  2:  tan */

-    { 64, 132,   0},    /*  3:  medium green */

-    {189, 117,   1},    /*  4:  gold */

-    {253, 249,   1},    /*  5:  yellow */

-    {  0,   0, 255},    /*  6:  blue */

-    {  0,   0, 120},    /*  7:  medium blue */

-    {255,   0, 255},    /*  8:  magenta */

-    { 64,   0,  64},    /*  9:  dark magenta */

-    {255,   0,   0},    /* 10:  red */

-    { 64,   0,   0},    /* 11:  dark red */

-    {255, 127,   0},    /* 12:  orange */

-    {192,  96,   0},    /* 13:  darker orange */

-    { 24,  60,   0},    /* 14:  dark green-yellow */

-    { 85, 125, 200}     /* 15:  ice blue */

-};

-/* not used for now, but should be for error-checking:

-static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);

- */

-

-/*

-    This whole struct is a fairly cheesy way to keep the number of

-    command-line options to a minimum.  The radial-waves background

-    type is a particularly poor fit to the integer elements of the

-    struct...but a few macros and a little fixed-point math will do

-    wonders for ya.

-

-    type bits:

-       F E D C B A 9 8 7 6 5 4 3 2 1 0

-                             | | | | |

-                             | | +-+-+-- 0 = sharp-edged checkerboard

-                             | |         1 = soft diamonds

-                             | |         2 = radial waves

-                             | |       3-7 = undefined

-                             | +-- gradient #2 inverted?

-                             +-- alternating columns inverted?

- */

-static struct background_pattern {

-    ush type;

-    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */

-    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/

-} bg[] = {

-    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */

-    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */

-    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */

-    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */

-    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */

-    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */

-    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */

-    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */

-    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */

-    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */

-    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */

-    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */

-    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */

-    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */

-    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */

-    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */

-};

-static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);

-

-

-/* Windows-specific global variables (could go in struct, but messy...) */

-static ulg wimage_rowbytes;

-static uch *dib;

-static uch *wimage_data;

-static BITMAPINFOHEADER *bmih;

-

-static HWND global_hwnd;

-static HINSTANCE global_hInst;

-static int global_showmode;

-

-

-

-

-int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)

-{

-    char *args[1024];                 /* arbitrary limit, but should suffice */

-    char **argv = args;

-    char *p, *q, *bgstr = NULL;

-    int argc = 0;

-    int rc, alen, flen;

-    int error = 0;

-    int timing = FALSE;

-    int have_bg = FALSE;

-    double LUT_exponent;              /* just the lookup table */

-    double CRT_exponent = 2.2;        /* just the monitor */

-    double default_display_exponent;  /* whole display system */

-    MSG msg;

-

-

-    /* First initialize a few things, just to be sure--memset takes care of

-     * default background color (black), booleans (FALSE), pointers (NULL),

-     * etc. */

-

-    global_hInst = hInst;

-    global_showmode = showmode;

-    filename = (char *)NULL;

-    memset(&rpng2_info, 0, sizeof(mainprog_info));

-

-#ifndef __CYGWIN__

-    /* Next reenable console output, which normally goes to the bit bucket

-     * for windowed apps.  Closing the console window will terminate the

-     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical

-     * incantation. */

-

-    AllocConsole();

-    freopen("CONOUT$", "a", stderr);

-    freopen("CONOUT$", "a", stdout);

-#endif

-

-    /* Set the default value for our display-system exponent, i.e., the

-     * product of the CRT exponent and the exponent corresponding to

-     * the frame-buffer's lookup table (LUT), if any.  This is not an

-     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird

-     * ones), but it should cover 99% of the current possibilities.  And

-     * yes, these ifdefs are completely wasted in a Windows program... */

-

-#if defined(NeXT)

-    /* third-party utilities can modify the default LUT exponent */

-    LUT_exponent = 1.0 / 2.2;

-    /*

-    if (some_next_function_that_returns_gamma(&next_gamma))

-        LUT_exponent = 1.0 / next_gamma;

-     */

-#elif defined(sgi)

-    LUT_exponent = 1.0 / 1.7;

-    /* there doesn't seem to be any documented function to

-     * get the "gamma" value, so we do it the hard way */

-    infile = fopen("/etc/config/system.glGammaVal", "r");

-    if (infile) {

-        double sgi_gamma;

-

-        fgets(tmpline, 80, infile);

-        fclose(infile);

-        sgi_gamma = atof(tmpline);

-        if (sgi_gamma > 0.0)

-            LUT_exponent = 1.0 / sgi_gamma;

-    }

-#elif defined(Macintosh)

-    LUT_exponent = 1.8 / 2.61;

-    /*

-    if (some_mac_function_that_returns_gamma(&mac_gamma))

-        LUT_exponent = mac_gamma / 2.61;

-     */

-#else

-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */

-#endif

-

-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */

-    default_display_exponent = LUT_exponent * CRT_exponent;

-

-

-    /* If the user has set the SCREEN_GAMMA environment variable as suggested

-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise

-     * use the default value we just calculated.  Either way, the user may

-     * override this via a command-line option. */

-

-    if ((p = getenv("SCREEN_GAMMA")) != NULL)

-        rpng2_info.display_exponent = atof(p);

-    else

-        rpng2_info.display_exponent = default_display_exponent;

-

-

-    /* Windows really hates command lines, so we have to set up our own argv.

-     * Note that we do NOT bother with quoted arguments here, so don't use

-     * filenames with spaces in 'em! */

-

-    argv[argc++] = PROGNAME;

-    p = cmd;

-    for (;;) {

-        if (*p == ' ')

-            while (*++p == ' ')

-                ;

-        /* now p points at the first non-space after some spaces */

-        if (*p == '\0')

-            break;    /* nothing after the spaces:  done */

-        argv[argc++] = q = p;

-        while (*q && *q != ' ')

-            ++q;

-        /* now q points at a space or the end of the string */

-        if (*q == '\0')

-            break;    /* last argv already terminated; quit */

-        *q = '\0';    /* change space to terminator */

-        p = q + 1;

-    }

-    argv[argc] = NULL;   /* terminate the argv array itself */

-

-

-    /* Now parse the command line for options and the PNG filename. */

-

-    while (*++argv && !error) {

-        if (!strncmp(*argv, "-gamma", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                rpng2_info.display_exponent = atof(*argv);

-                if (rpng2_info.display_exponent <= 0.0)

-                    ++error;

-            }

-        } else if (!strncmp(*argv, "-bgcolor", 4)) {

-            if (!*++argv)

-                ++error;

-            else {

-                bgstr = *argv;

-                if (strlen(bgstr) != 7 || bgstr[0] != '#')

-                    ++error;

-                else {

-                    have_bg = TRUE;

-                    bg_image = FALSE;

-                }

-            }

-        } else if (!strncmp(*argv, "-bgpat", 4)) {

-            if (!*++argv)

-                ++error;

-            else {

-                pat = atoi(*argv) - 1;

-                if (pat < 0 || pat >= num_bgpat)

-                    ++error;

-                else {

-                    bg_image = TRUE;

-                    have_bg = FALSE;

-                }

-            }

-        } else if (!strncmp(*argv, "-timing", 2)) {

-            timing = TRUE;

-        } else {

-            if (**argv != '-') {

-                filename = *argv;

-                if (argv[1])   /* shouldn't be any more args after filename */

-                    ++error;

-            } else

-                ++error;   /* not expecting any other options */

-        }

-    }

-

-    if (!filename)

-        ++error;

-

-

-    /* print usage screen if any errors up to this point */

-

-    if (error) {

-#ifndef __CYGWIN__

-        int ch;

-#endif

-

-        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);

-        readpng2_version_info();

-        fprintf(stderr, "\n"

-          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"

-          "        %*s file.png\n\n"

-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"

-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"

-          "\t\t  to the product of the lookup-table exponent (varies)\n"

-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"

-          "    bg  \tdesired background color in 7-character hex RGB format\n"

-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"

-          "\t\t  used with transparent images; overrides -bgpat option\n"

-          "    pat \tdesired background pattern number (1-%d); used with\n"

-          "\t\t  transparent images; overrides -bgcolor option\n"

-          "    -timing\tenables delay for every block read, to simulate modem\n"

-          "\t\t  download of image (~36 Kbps)\n"

-          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"

-#ifndef __CYGWIN__

-          "Press Q or Esc to quit this usage screen. ",

-#else

-          ,

-#endif

-          PROGNAME,

-#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \

-    !(defined(__CYGWIN__) || defined(__MINGW32__))

-          (int)strlen(PROGNAME), " ",

-#endif

-          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);

-        fflush(stderr);

-#ifndef __CYGWIN__

-        do

-            ch = _getch();

-        while (ch != 'q' && ch != 'Q' && ch != 0x1B);

-#endif

-        exit(1);

-    }

-

-

-    if (!(infile = fopen(filename, "rb"))) {

-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);

-        ++error;

-    } else {

-        incount = fread(inbuf, 1, INBUFSIZE, infile);

-        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {

-            fprintf(stderr, PROGNAME

-              ":  [%s] is not a PNG file: incorrect signature\n",

-              filename);

-            ++error;

-        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {

-            switch (rc) {

-                case 2:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);

-                    break;

-                case 4:

-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");

-                    break;

-                default:

-                    fprintf(stderr, PROGNAME

-                      ":  unknown readpng2_init() error\n");

-                    break;

-            }

-            ++error;

-        }

-        if (error)

-            fclose(infile);

-    }

-

-

-    if (error) {

-#ifndef __CYGWIN__

-        int ch;

-#endif

-

-        fprintf(stderr, PROGNAME ":  aborting.\n");

-#ifndef __CYGWIN__

-        do

-            ch = _getch();

-        while (ch != 'q' && ch != 'Q' && ch != 0x1B);

-#endif

-        exit(2);

-    } else {

-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);

-#ifndef __CYGWIN__

-        fprintf(stderr,

-          "\n   [console window:  closing this window will terminate %s]\n\n",

-          PROGNAME);

-#endif

-        fflush(stderr);

-    }

-

-

-    /* set the title-bar string, but make sure buffer doesn't overflow */

-

-    alen = strlen(appname);

-    flen = strlen(filename);

-    if (alen + flen + 3 > 1023)

-        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));

-    else

-        sprintf(titlebar, "%s:  %s", appname, filename);

-

-

-    /* set some final rpng2_info variables before entering main data loop */

-

-    if (have_bg) {

-        unsigned r, g, b;   /* this approach quiets compiler warnings */

-

-        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);

-        rpng2_info.bg_red   = (uch)r;

-        rpng2_info.bg_green = (uch)g;

-        rpng2_info.bg_blue  = (uch)b;

-    } else

-        rpng2_info.need_bgcolor = TRUE;

-

-    rpng2_info.state = kPreInit;

-    rpng2_info.mainprog_init = rpng2_win_init;

-    rpng2_info.mainprog_display_row = rpng2_win_display_row;

-    rpng2_info.mainprog_finish_display = rpng2_win_finish_display;

-

-

-    /* OK, this is the fun part:  call readpng2_decode_data() at the start of

-     * the loop to deal with our first buffer of data (read in above to verify

-     * that the file is a PNG image), then loop through the file and continue

-     * calling the same routine to handle each chunk of data.  It in turn

-     * passes the data to libpng, which will invoke one or more of our call-

-     * backs as decoded data become available.  We optionally call Sleep() for

-     * one second per iteration to simulate downloading the image via an analog

-     * modem. */

-

-    for (;;) {

-        Trace((stderr, "about to call readpng2_decode_data()\n"))

-        if (readpng2_decode_data(&rpng2_info, inbuf, incount))

-            ++error;

-        Trace((stderr, "done with readpng2_decode_data()\n"))

-

-        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {

-            if (rpng2_info.state == kDone) {

-                Trace((stderr, "done decoding PNG image\n"))

-            } else if (ferror(infile)) {

-                fprintf(stderr, PROGNAME

-                  ":  error while reading PNG image file\n");

-                exit(3);

-            } else if (feof(infile)) {

-                fprintf(stderr, PROGNAME ":  end of file reached "

-                  "(unexpectedly) while reading PNG image file\n");

-                exit(3);

-            } else /* if (error) */ {

-                /* will print error message below */

-            }

-            break;

-        }

-

-        if (timing)

-            Sleep(1000L);

-

-        incount = fread(inbuf, 1, INBUFSIZE, infile);

-    }

-

-

-    /* clean up PNG stuff and report any decoding errors */

-

-    fclose(infile);

-    Trace((stderr, "about to call readpng2_cleanup()\n"))

-    readpng2_cleanup(&rpng2_info);

-

-    if (error) {

-        fprintf(stderr, PROGNAME ":  libpng error while decoding PNG image\n");

-        exit(3);

-    }

-

-

-    /* wait for the user to tell us when to quit */

-

-    while (GetMessage(&msg, NULL, 0, 0)) {

-        TranslateMessage(&msg);

-        DispatchMessage(&msg);

-    }

-

-

-    /* we're done:  clean up all image and Windows resources and go away */

-

-    Trace((stderr, "about to call rpng2_win_cleanup()\n"))

-    rpng2_win_cleanup();

-

-    return msg.wParam;

-}

-

-

-

-

-

-/* this function is called by readpng2_info_callback() in readpng2.c, which

- * in turn is called by libpng after all of the pre-IDAT chunks have been

- * read and processed--i.e., we now have enough info to finish initializing */

-

-static void rpng2_win_init()

-{

-    ulg i;

-    ulg rowbytes = rpng2_info.rowbytes;

-

-    Trace((stderr, "beginning rpng2_win_init()\n"))

-    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))

-    Trace((stderr, "  width  = %ld\n", rpng2_info.width))

-    Trace((stderr, "  height = %ld\n", rpng2_info.height))

-

-    rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);

-    if (!rpng2_info.image_data) {

-        readpng2_cleanup(&rpng2_info);

-        return;

-    }

-

-    rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));

-    if (!rpng2_info.row_pointers) {

-        free(rpng2_info.image_data);

-        rpng2_info.image_data = NULL;

-        readpng2_cleanup(&rpng2_info);

-        return;

-    }

-

-    for (i = 0;  i < rpng2_info.height;  ++i)

-        rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;

-

-/*---------------------------------------------------------------------------

-    Do the basic Windows initialization stuff, make the window, and fill it

-    with the user-specified, file-specified or default background color.

-  ---------------------------------------------------------------------------*/

-

-    if (rpng2_win_create_window()) {

-        readpng2_cleanup(&rpng2_info);

-        return;

-    }

-

-    rpng2_info.state = kWindowInit;

-}

-

-

-

-

-

-static int rpng2_win_create_window()

-{

-    uch bg_red   = rpng2_info.bg_red;

-    uch bg_green = rpng2_info.bg_green;

-    uch bg_blue  = rpng2_info.bg_blue;

-    uch *dest;

-    int extra_width, extra_height;

-    ulg i, j;

-    WNDCLASSEX wndclass;

-    RECT rect;

-

-

-/*---------------------------------------------------------------------------

-    Allocate memory for the display-specific version of the image (round up

-    to multiple of 4 for Windows DIB).

-  ---------------------------------------------------------------------------*/

-

-    wimage_rowbytes = ((3*rpng2_info.width + 3L) >> 2) << 2;

-

-    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +

-                              wimage_rowbytes*rpng2_info.height)))

-    {

-        return 4;   /* fail */

-    }

-

-/*---------------------------------------------------------------------------

-    Initialize the DIB.  Negative height means to use top-down BMP ordering

-    (must be uncompressed, but that's what we want).  Bit count of 1, 4 or 8

-    implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values

-    directly => wimage_data begins immediately after BMP header.

-  ---------------------------------------------------------------------------*/

-

-    memset(dib, 0, sizeof(BITMAPINFOHEADER));

-    bmih = (BITMAPINFOHEADER *)dib;

-    bmih->biSize = sizeof(BITMAPINFOHEADER);

-    bmih->biWidth = rpng2_info.width;

-    bmih->biHeight = -((long)rpng2_info.height);

-    bmih->biPlanes = 1;

-    bmih->biBitCount = 24;

-    bmih->biCompression = 0;

-    wimage_data = dib + sizeof(BITMAPINFOHEADER);

-

-/*---------------------------------------------------------------------------

-    Fill window with the specified background color (default is black), but

-    defer loading faked "background image" until window is displayed (may be

-    slow to compute).  Data are in BGR order.

-  ---------------------------------------------------------------------------*/

-

-    if (bg_image) {   /* just fill with black for now */

-        memset(wimage_data, 0, wimage_rowbytes*rpng2_info.height);

-    } else {

-        for (j = 0;  j < rpng2_info.height;  ++j) {

-            dest = wimage_data + j*wimage_rowbytes;

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                *dest++ = bg_blue;

-                *dest++ = bg_green;

-                *dest++ = bg_red;

-            }

-        }

-    }

-

-/*---------------------------------------------------------------------------

-    Set the window parameters.

-  ---------------------------------------------------------------------------*/

-

-    memset(&wndclass, 0, sizeof(wndclass));

-

-    wndclass.cbSize = sizeof(wndclass);

-    wndclass.style = CS_HREDRAW | CS_VREDRAW;

-    wndclass.lpfnWndProc = rpng2_win_wndproc;

-    wndclass.hInstance = global_hInst;

-    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);

-    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);

-    wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);

-    wndclass.lpszMenuName = NULL;

-    wndclass.lpszClassName = progname;

-    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

-

-    RegisterClassEx(&wndclass);

-

-/*---------------------------------------------------------------------------

-    Finally, create the window.

-  ---------------------------------------------------------------------------*/

-

-    extra_width  = 2*(GetSystemMetrics(SM_CXBORDER) +

-                      GetSystemMetrics(SM_CXDLGFRAME));

-    extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +

-                      GetSystemMetrics(SM_CYDLGFRAME)) +

-                      GetSystemMetrics(SM_CYCAPTION);

-

-    global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,

-      CW_USEDEFAULT, CW_USEDEFAULT, rpng2_info.width+extra_width,

-      rpng2_info.height+extra_height, NULL, NULL, global_hInst, NULL);

-

-    ShowWindow(global_hwnd, global_showmode);

-    UpdateWindow(global_hwnd);

-

-/*---------------------------------------------------------------------------

-    Now compute the background image and display it.  If it fails (memory

-    allocation), revert to a plain background color.

-  ---------------------------------------------------------------------------*/

-

-    if (bg_image) {

-        static const char *msg = "Computing background image...";

-        int x, y, len = strlen(msg);

-        HDC hdc = GetDC(global_hwnd);

-        TEXTMETRIC tm;

-

-        GetTextMetrics(hdc, &tm);

-        x = (rpng2_info.width - len*tm.tmAveCharWidth)/2;

-        y = (rpng2_info.height - tm.tmHeight)/2;

-        SetBkMode(hdc, TRANSPARENT);

-        SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT));

-        /* this can still begin out of bounds even if x is positive (???): */

-        TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);

-        ReleaseDC(global_hwnd, hdc);

-

-        rpng2_win_load_bg_image();   /* resets bg_image if fails */

-    }

-

-    if (!bg_image) {

-        for (j = 0;  j < rpng2_info.height;  ++j) {

-            dest = wimage_data + j*wimage_rowbytes;

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                *dest++ = bg_blue;

-                *dest++ = bg_green;

-                *dest++ = bg_red;

-            }

-        }

-    }

-

-    rect.left = 0L;

-    rect.top = 0L;

-    rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */

-    rect.bottom = (LONG)rpng2_info.height;     /* possibly off by one? */

-    InvalidateRect(global_hwnd, &rect, FALSE);

-    UpdateWindow(global_hwnd);                 /* similar to XFlush() */

-

-    return 0;

-

-} /* end function rpng2_win_create_window() */

-

-

-

-

-

-static int rpng2_win_load_bg_image()

-{

-    uch *src, *dest;

-    uch r1, r2, g1, g2, b1, b2;

-    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;

-    int k, hmax, max;

-    int xidx, yidx, yidx_max = (bgscale-1);

-    int even_odd_vert, even_odd_horiz, even_odd;

-    int invert_gradient2 = (bg[pat].type & 0x08);

-    int invert_column;

-    ulg i, row;

-

-/*---------------------------------------------------------------------------

-    Allocate buffer for fake background image to be used with transparent

-    images; if this fails, revert to plain background color.

-  ---------------------------------------------------------------------------*/

-

-    bg_rowbytes = 3 * rpng2_info.width;

-    bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);

-    if (!bg_data) {

-        fprintf(stderr, PROGNAME

-          ":  unable to allocate memory for background image\n");

-        bg_image = 0;

-        return 1;

-    }

-

-/*---------------------------------------------------------------------------

-    Vertical gradients (ramps) in NxN squares, alternating direction and

-    colors (N == bgscale).

-  ---------------------------------------------------------------------------*/

-

-    if ((bg[pat].type & 0x07) == 0) {

-        uch r1_min  = rgb[bg[pat].rgb1_min].r;

-        uch g1_min  = rgb[bg[pat].rgb1_min].g;

-        uch b1_min  = rgb[bg[pat].rgb1_min].b;

-        uch r2_min  = rgb[bg[pat].rgb2_min].r;

-        uch g2_min  = rgb[bg[pat].rgb2_min].g;

-        uch b2_min  = rgb[bg[pat].rgb2_min].b;

-        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;

-        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;

-        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;

-        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;

-        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;

-        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = row % bgscale;

-            even_odd_vert = (row / bgscale) & 1;

-

-            r1 = r1_min + (r1_diff * yidx) / yidx_max;

-            g1 = g1_min + (g1_diff * yidx) / yidx_max;

-            b1 = b1_min + (b1_diff * yidx) / yidx_max;

-            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;

-            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;

-            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;

-

-            r2 = r2_min + (r2_diff * yidx) / yidx_max;

-            g2 = g2_min + (g2_diff * yidx) / yidx_max;

-            b2 = b2_min + (b2_diff * yidx) / yidx_max;

-            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;

-            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;

-            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;

-

-            dest = bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                even_odd_horiz = (i / bgscale) & 1;

-                even_odd = even_odd_vert ^ even_odd_horiz;

-                invert_column =

-                  (even_odd_horiz && (bg[pat].type & 0x10));

-                if (even_odd == 0) {         /* gradient #1 */

-                    if (invert_column) {

-                        *dest++ = r1_inv;

-                        *dest++ = g1_inv;

-                        *dest++ = b1_inv;

-                    } else {

-                        *dest++ = r1;

-                        *dest++ = g1;

-                        *dest++ = b1;

-                    }

-                } else {                     /* gradient #2 */

-                    if ((invert_column && invert_gradient2) ||

-                        (!invert_column && !invert_gradient2))

-                    {

-                        *dest++ = r2;        /* not inverted or */

-                        *dest++ = g2;        /*  doubly inverted */

-                        *dest++ = b2;

-                    } else {

-                        *dest++ = r2_inv;

-                        *dest++ = g2_inv;    /* singly inverted */

-                        *dest++ = b2_inv;

-                    }

-                }

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam

-    M. Costello.

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 1) {

-

-        hmax = (bgscale-1)/2;   /* half the max weight of a color */

-        max = 2*hmax;           /* the max weight of a color */

-

-        r1 = rgb[bg[pat].rgb1_max].r;

-        g1 = rgb[bg[pat].rgb1_max].g;

-        b1 = rgb[bg[pat].rgb1_max].b;

-        r2 = rgb[bg[pat].rgb2_max].r;

-        g2 = rgb[bg[pat].rgb2_max].g;

-        b2 = rgb[bg[pat].rgb2_max].b;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = row % bgscale;

-            if (yidx > hmax)

-                yidx = bgscale-1 - yidx;

-            dest = bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                xidx = i % bgscale;

-                if (xidx > hmax)

-                    xidx = bgscale-1 - xidx;

-                k = xidx + yidx;

-                *dest++ = (k*r1 + (max-k)*r2) / max;

-                *dest++ = (k*g1 + (max-k)*g2) / max;

-                *dest++ = (k*b1 + (max-k)*b2) / max;

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-

-    soids will equal bgscale?].  This one is slow but very cool.  Code con-

-    tributed by Pieter S. van der Meulen (originally in Smalltalk).

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 2) {

-        uch ch;

-        int ii, x, y, hw, hh, grayspot;

-        double freq, rotate, saturate, gray, intensity;

-        double angle=0.0, aoffset=0.0, maxDist, dist;

-        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;

-

-        fprintf(stderr, "%s:  computing radial background...",

-          PROGNAME);

-        fflush(stderr);

-

-        hh = rpng2_info.height / 2;

-        hw = rpng2_info.width / 2;

-

-        /* variables for radial waves:

-         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]

-         *   freq:  number of color beams originating from the center

-         *   grayspot:  size of the graying center area (anti-alias)

-         *   rotate:  rotation of the beams as a function of radius

-         *   saturate:  saturation of beams' shape azimuthally

-         */

-        angle = CLIP(angle, 0.0, 360.0);

-        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));

-        freq = MAX((double)bg[pat].bg_freq, 0.0);

-        saturate = (double)bg[pat].bg_bsat * 0.1;

-        rotate = (double)bg[pat].bg_brot * 0.1;

-        gray = 0.0;

-        intensity = 0.0;

-        maxDist = (double)((hw*hw) + (hh*hh));

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            y = row - hh;

-            dest = bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                x = i - hw;

-                angle = (x == 0)? PI_2 : atan((double)y / (double)x);

-                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;

-                gray = MIN(1.0, gray);

-                dist = (double)((x*x) + (y*y)) / maxDist;

-                intensity = cos((angle+(rotate*dist*PI)) * freq) *

-                  gray * saturate;

-                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;

-                hue = (angle + PI) * INV_PI_360 + aoffset;

-                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));

-                s = MIN(MAX(s,0.0), 1.0);

-                v = MIN(MAX(intensity,0.0), 1.0);

-

-                if (s == 0.0) {

-                    ch = (uch)(v * 255.0);

-                    *dest++ = ch;

-                    *dest++ = ch;

-                    *dest++ = ch;

-                } else {

-                    if ((hue < 0.0) || (hue >= 360.0))

-                        hue -= (((int)(hue / 360.0)) * 360.0);

-                    hue /= 60.0;

-                    ii = (int)hue;

-                    f = hue - (double)ii;

-                    p = (1.0 - s) * v;

-                    q = (1.0 - (s * f)) * v;

-                    t = (1.0 - (s * (1.0 - f))) * v;

-                    if      (ii == 0) { red = v; green = t; blue = p; }

-                    else if (ii == 1) { red = q; green = v; blue = p; }

-                    else if (ii == 2) { red = p; green = v; blue = t; }

-                    else if (ii == 3) { red = p; green = q; blue = v; }

-                    else if (ii == 4) { red = t; green = p; blue = v; }

-                    else if (ii == 5) { red = v; green = p; blue = q; }

-                    *dest++ = (uch)(red * 255.0);

-                    *dest++ = (uch)(green * 255.0);

-                    *dest++ = (uch)(blue * 255.0);

-                }

-            }

-        }

-        fprintf(stderr, "done.\n");

-        fflush(stderr);

-    }

-

-/*---------------------------------------------------------------------------

-    Blast background image to display buffer before beginning PNG decode;

-    calling function will handle invalidation and UpdateWindow() call.

-  ---------------------------------------------------------------------------*/

-

-    for (row = 0;  row < rpng2_info.height;  ++row) {

-        src = bg_data + row*bg_rowbytes;

-        dest = wimage_data + row*wimage_rowbytes;

-        for (i = rpng2_info.width;  i > 0;  --i) {

-            r1 = *src++;

-            g1 = *src++;

-            b1 = *src++;

-            *dest++ = b1;

-            *dest++ = g1;   /* note reverse order */

-            *dest++ = r1;

-        }

-    }

-

-    return 0;

-

-} /* end function rpng2_win_load_bg_image() */

-

-

-

-

-

-static void rpng2_win_display_row(ulg row)

-{

-    uch bg_red   = rpng2_info.bg_red;

-    uch bg_green = rpng2_info.bg_green;

-    uch bg_blue  = rpng2_info.bg_blue;

-    uch *src, *src2=NULL, *dest;

-    uch r, g, b, a;

-    ulg i;

-    static int rows=0;

-    static ulg firstrow;

-

-/*---------------------------------------------------------------------------

-    rows and firstrow simply track how many rows (and which ones) have not

-    yet been displayed; alternatively, we could call InvalidateRect() for

-    every row and not bother with the records-keeping.

-  ---------------------------------------------------------------------------*/

-

-    Trace((stderr, "beginning rpng2_win_display_row()\n"))

-

-    if (rows == 0)

-        firstrow = row;   /* first row not yet displayed */

-

-    ++rows;   /* count of rows received but not yet displayed */

-

-/*---------------------------------------------------------------------------

-    Aside from the use of the rpng2_info struct and the lack of an outer

-    loop (over rows), this routine is identical to rpng_win_display_image()

-    in the non-progressive version of the program.

-  ---------------------------------------------------------------------------*/

-

-    src = rpng2_info.image_data + row*rpng2_info.rowbytes;

-    if (bg_image)

-        src2 = bg_data + row*bg_rowbytes;

-    dest = wimage_data + row*wimage_rowbytes;

-

-    if (rpng2_info.channels == 3) {

-        for (i = rpng2_info.width;  i > 0;  --i) {

-            r = *src++;

-            g = *src++;

-            b = *src++;

-            *dest++ = b;

-            *dest++ = g;   /* note reverse order */

-            *dest++ = r;

-        }

-    } else /* if (rpng2_info.channels == 4) */ {

-        for (i = rpng2_info.width;  i > 0;  --i) {

-            r = *src++;

-            g = *src++;

-            b = *src++;

-            a = *src++;

-            if (bg_image) {

-                bg_red   = *src2++;

-                bg_green = *src2++;

-                bg_blue  = *src2++;

-            }

-            if (a == 255) {

-                *dest++ = b;

-                *dest++ = g;

-                *dest++ = r;

-            } else if (a == 0) {

-                *dest++ = bg_blue;

-                *dest++ = bg_green;

-                *dest++ = bg_red;

-            } else {

-                /* this macro (copied from png.h) composites the

-                 * foreground and background values and puts the

-                 * result into the first argument; there are no

-                 * side effects with the first argument */

-                alpha_composite(*dest++, b, a, bg_blue);

-                alpha_composite(*dest++, g, a, bg_green);

-                alpha_composite(*dest++, r, a, bg_red);

-            }

-        }

-    }

-

-/*---------------------------------------------------------------------------

-    Display after every 16 rows or when on last row.  (Region may include

-    previously displayed lines due to interlacing--i.e., not contiguous.)

-  ---------------------------------------------------------------------------*/

-

-    if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {

-        RECT rect;

-

-        rect.left = 0L;

-        rect.top = (LONG)firstrow;

-        rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */

-        rect.bottom = (LONG)row + 1L;              /* possibly off by one? */

-        InvalidateRect(global_hwnd, &rect, FALSE);

-        UpdateWindow(global_hwnd);                 /* similar to XFlush() */

-        rows = 0;

-    }

-

-} /* end function rpng2_win_display_row() */

-

-

-

-

-

-static void rpng2_win_finish_display()

-{

-    Trace((stderr, "beginning rpng2_win_finish_display()\n"))

-

-    /* last row has already been displayed by rpng2_win_display_row(), so

-     * we have nothing to do here except set a flag and let the user know

-     * that the image is done */

-

-    rpng2_info.state = kDone;

-    printf(

-#ifndef __CYGWIN__

-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"

-#else

-      "Done.  Press mouse button 1 (within image window) to quit.\n"

-#endif

-    );

-    fflush(stdout);

-}

-

-

-

-

-

-static void rpng2_win_cleanup()

-{

-    if (bg_image && bg_data) {

-        free(bg_data);

-        bg_data = NULL;

-    }

-

-    if (rpng2_info.image_data) {

-        free(rpng2_info.image_data);

-        rpng2_info.image_data = NULL;

-    }

-

-    if (rpng2_info.row_pointers) {

-        free(rpng2_info.row_pointers);

-        rpng2_info.row_pointers = NULL;

-    }

-

-    if (dib) {

-        free(dib);

-        dib = NULL;

-    }

-}

-

-

-

-

-

-LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)

-{

-    HDC         hdc;

-    PAINTSTRUCT ps;

-    int rc;

-

-    switch (iMsg) {

-        case WM_CREATE:

-            /* one-time processing here, if any */

-            return 0;

-

-        case WM_PAINT:

-            hdc = BeginPaint(hwnd, &ps);

-            rc = StretchDIBits(hdc, 0, 0, rpng2_info.width, rpng2_info.height,

-                                    0, 0, rpng2_info.width, rpng2_info.height,

-                                    wimage_data, (BITMAPINFO *)bmih,

-                                    0, SRCCOPY);

-            EndPaint(hwnd, &ps);

-            return 0;

-

-        /* wait for the user to tell us when to quit */

-        case WM_CHAR:

-            switch (wP) {       /* only need one, so ignore repeat count */

-                case 'q':

-                case 'Q':

-                case 0x1B:      /* Esc key */

-                    PostQuitMessage(0);

-            }

-            return 0;

-

-        case WM_LBUTTONDOWN:    /* another way of quitting */

-        case WM_DESTROY:

-            PostQuitMessage(0);

-            return 0;

-    }

-

-    return DefWindowProc(hwnd, iMsg, wP, lP);

-}

+/*---------------------------------------------------------------------------
+
+   rpng2 - progressive-model PNG display program                rpng2-win.c
+
+   This program decodes and displays PNG files progressively, as if it were
+   a web browser (though the front end is only set up to read from files).
+   It supports gamma correction, user-specified background colors, and user-
+   specified background patterns (for transparent images).  This version is
+   for 32-bit Windows; it may compile under 16-bit Windows with a little
+   tweaking (or maybe not).  Thanks to Adam Costello and Pieter S. van der
+   Meulen for the "diamond" and "radial waves" patterns, respectively.
+
+   to do (someday, maybe):
+    - handle quoted command-line args (especially filenames with spaces)
+    - finish resizable checkerboard-gradient (sizes 4-128?)
+    - use %.1023s to simplify truncation of title-bar string?
+    - have minimum window width:  oh well
+
+  ---------------------------------------------------------------------------
+
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  fixed cut-and-paste error in usage screen (oops...)
+    - 1.03:  modified to allow abbreviated options
+    - 1.04:  removed bogus extra argument from usage fprintf() [Glenn R-P?];
+              fixed command-line parsing bug
+    - 1.10:  enabled "message window"/console (thanks to David Geldreich)
+    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
+    - 1.21:  made minor tweak to usage screen to fit within 25-line console
+    - 1.22:  added AMD64/EM64T support (__x86_64__)
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed 64-bit typo in readpng2.c
+    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
+              unexpected-EOF and file-read-error cases
+    - 2.03:  removed runtime MMX-enabling/disabling and obsolete -mmx* options
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#define PROGNAME  "rpng2-win"
+#define LONGNAME  "Progressive PNG Viewer for Windows"
+#define VERSION   "2.02 of 16 March 2008"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>    /* for jmpbuf declaration in readpng2.h */
+#include <time.h>
+#include <math.h>      /* only for PvdM background code */
+#include <windows.h>
+#ifdef __CYGWIN__
+/* getch replacement. Turns out, we don't really need this,
+ * but leave it here if we ever enable any of the uses of
+ * _getch in the main code
+ */
+#include <unistd.h>
+#include <termio.h>
+#include <sys/ioctl.h>
+int repl_getch( void )
+{
+  char ch;
+  int fd = fileno(stdin);
+  struct termio old_tty, new_tty;
+
+  ioctl(fd, TCGETA, &old_tty);
+  new_tty = old_tty;
+  new_tty.c_lflag &= ~(ICANON | ECHO | ISIG);
+  ioctl(fd, TCSETA, &new_tty);
+  fread(&ch, 1, sizeof(ch), stdin);
+  ioctl(fd, TCSETA, &old_tty);
+
+  return ch;
+}
+#define _getch repl_getch
+#else
+#include <conio.h>     /* only for _getch() */
+#endif
+
+/* all for PvdM background code: */
+#ifndef PI
+#  define PI             3.141592653589793238
+#endif
+#define PI_2             (PI*0.5)
+#define INV_PI_360       (360.0 / PI)
+#define MAX(a,b)         (a>b?a:b)
+#define MIN(a,b)         (a<b?a:b)
+#define CLIP(a,min,max)  MAX(min,MIN((a),max))
+#define ABS(a)           ((a)<0?-(a):(a))
+#define CLIP8P(c)        MAX(0,(MIN((c),255)))   /* 8-bit pos. integer (uch) */
+#define ROUNDF(f)        ((int)(f + 0.5))
+
+#define rgb1_max   bg_freq
+#define rgb1_min   bg_gray
+#define rgb2_max   bg_bsat
+#define rgb2_min   bg_brot
+
+/* #define DEBUG */     /* this enables the Trace() macros */
+
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */
+
+
+/* could just include png.h, but this macro is the only thing we need
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
+ * "ush acopy = (alpha);") */
+
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
+}
+
+
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */
+
+/* local prototypes */
+static void       rpng2_win_init(void);
+static int        rpng2_win_create_window(void);
+static int        rpng2_win_load_bg_image(void);
+static void       rpng2_win_display_row(ulg row);
+static void       rpng2_win_finish_display(void);
+static void       rpng2_win_cleanup(void);
+LRESULT CALLBACK  rpng2_win_wndproc(HWND, UINT, WPARAM, LPARAM);
+
+
+static char titlebar[1024];
+static char *progname = PROGNAME;
+static char *appname = LONGNAME;
+static char *filename;
+static FILE *infile;
+
+static mainprog_info rpng2_info;
+
+static uch inbuf[INBUFSIZE];
+static int incount;
+
+static int pat = 6;         /* must be less than num_bgpat */
+static int bg_image = 0;
+static int bgscale = 16;
+static ulg bg_rowbytes;
+static uch *bg_data;
+
+static struct rgb_color {
+    uch r, g, b;
+} rgb[] = {
+    {  0,   0,   0},    /*  0:  black */
+    {255, 255, 255},    /*  1:  white */
+    {173, 132,  57},    /*  2:  tan */
+    { 64, 132,   0},    /*  3:  medium green */
+    {189, 117,   1},    /*  4:  gold */
+    {253, 249,   1},    /*  5:  yellow */
+    {  0,   0, 255},    /*  6:  blue */
+    {  0,   0, 120},    /*  7:  medium blue */
+    {255,   0, 255},    /*  8:  magenta */
+    { 64,   0,  64},    /*  9:  dark magenta */
+    {255,   0,   0},    /* 10:  red */
+    { 64,   0,   0},    /* 11:  dark red */
+    {255, 127,   0},    /* 12:  orange */
+    {192,  96,   0},    /* 13:  darker orange */
+    { 24,  60,   0},    /* 14:  dark green-yellow */
+    { 85, 125, 200}     /* 15:  ice blue */
+};
+/* not used for now, but should be for error-checking:
+static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
+ */
+
+/*
+    This whole struct is a fairly cheesy way to keep the number of
+    command-line options to a minimum.  The radial-waves background
+    type is a particularly poor fit to the integer elements of the
+    struct...but a few macros and a little fixed-point math will do
+    wonders for ya.
+
+    type bits:
+       F E D C B A 9 8 7 6 5 4 3 2 1 0
+                             | | | | |
+                             | | +-+-+-- 0 = sharp-edged checkerboard
+                             | |         1 = soft diamonds
+                             | |         2 = radial waves
+                             | |       3-7 = undefined
+                             | +-- gradient #2 inverted?
+                             +-- alternating columns inverted?
+ */
+static struct background_pattern {
+    ush type;
+    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */
+    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/
+} bg[] = {
+    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */
+    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */
+    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */
+    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */
+    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */
+    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */
+    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */
+    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */
+    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */
+    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */
+    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */
+    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */
+    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
+    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
+    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
+    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */
+};
+static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
+
+
+/* Windows-specific global variables (could go in struct, but messy...) */
+static ulg wimage_rowbytes;
+static uch *dib;
+static uch *wimage_data;
+static BITMAPINFOHEADER *bmih;
+
+static HWND global_hwnd;
+static HINSTANCE global_hInst;
+static int global_showmode;
+
+
+
+
+int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, PSTR cmd, int showmode)
+{
+    char *args[1024];                 /* arbitrary limit, but should suffice */
+    char **argv = args;
+    char *p, *q, *bgstr = NULL;
+    int argc = 0;
+    int rc, alen, flen;
+    int error = 0;
+    int timing = FALSE;
+    int have_bg = FALSE;
+    double LUT_exponent;              /* just the lookup table */
+    double CRT_exponent = 2.2;        /* just the monitor */
+    double default_display_exponent;  /* whole display system */
+    MSG msg;
+
+
+    /* First initialize a few things, just to be sure--memset takes care of
+     * default background color (black), booleans (FALSE), pointers (NULL),
+     * etc. */
+
+    global_hInst = hInst;
+    global_showmode = showmode;
+    filename = (char *)NULL;
+    memset(&rpng2_info, 0, sizeof(mainprog_info));
+
+#ifndef __CYGWIN__
+    /* Next reenable console output, which normally goes to the bit bucket
+     * for windowed apps.  Closing the console window will terminate the
+     * app.  Thanks to David.Geldreich@realviz.com for supplying the magical
+     * incantation. */
+
+    AllocConsole();
+    freopen("CONOUT$", "a", stderr);
+    freopen("CONOUT$", "a", stdout);
+#endif
+
+    /* Set the default value for our display-system exponent, i.e., the
+     * product of the CRT exponent and the exponent corresponding to
+     * the frame-buffer's lookup table (LUT), if any.  This is not an
+     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
+     * ones), but it should cover 99% of the current possibilities.  And
+     * yes, these ifdefs are completely wasted in a Windows program... */
+
+#if defined(NeXT)
+    /* third-party utilities can modify the default LUT exponent */
+    LUT_exponent = 1.0 / 2.2;
+    /*
+    if (some_next_function_that_returns_gamma(&next_gamma))
+        LUT_exponent = 1.0 / next_gamma;
+     */
+#elif defined(sgi)
+    LUT_exponent = 1.0 / 1.7;
+    /* there doesn't seem to be any documented function to
+     * get the "gamma" value, so we do it the hard way */
+    infile = fopen("/etc/config/system.glGammaVal", "r");
+    if (infile) {
+        double sgi_gamma;
+
+        fgets(tmpline, 80, infile);
+        fclose(infile);
+        sgi_gamma = atof(tmpline);
+        if (sgi_gamma > 0.0)
+            LUT_exponent = 1.0 / sgi_gamma;
+    }
+#elif defined(Macintosh)
+    LUT_exponent = 1.8 / 2.61;
+    /*
+    if (some_mac_function_that_returns_gamma(&mac_gamma))
+        LUT_exponent = mac_gamma / 2.61;
+     */
+#else
+    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
+#endif
+
+    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+    default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+    /* If the user has set the SCREEN_GAMMA environment variable as suggested
+     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+     * use the default value we just calculated.  Either way, the user may
+     * override this via a command-line option. */
+
+    if ((p = getenv("SCREEN_GAMMA")) != NULL)
+        rpng2_info.display_exponent = atof(p);
+    else
+        rpng2_info.display_exponent = default_display_exponent;
+
+
+    /* Windows really hates command lines, so we have to set up our own argv.
+     * Note that we do NOT bother with quoted arguments here, so don't use
+     * filenames with spaces in 'em! */
+
+    argv[argc++] = PROGNAME;
+    p = cmd;
+    for (;;) {
+        if (*p == ' ')
+            while (*++p == ' ')
+                ;
+        /* now p points at the first non-space after some spaces */
+        if (*p == '\0')
+            break;    /* nothing after the spaces:  done */
+        argv[argc++] = q = p;
+        while (*q && *q != ' ')
+            ++q;
+        /* now q points at a space or the end of the string */
+        if (*q == '\0')
+            break;    /* last argv already terminated; quit */
+        *q = '\0';    /* change space to terminator */
+        p = q + 1;
+    }
+    argv[argc] = NULL;   /* terminate the argv array itself */
+
+
+    /* Now parse the command line for options and the PNG filename. */
+
+    while (*++argv && !error) {
+        if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                pat = atoi(*argv) - 1;
+                if (pat < 0 || pat >= num_bgpat)
+                    ++error;
+                else {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-timing", 2)) {
+            timing = TRUE;
+        } else {
+            if (**argv != '-') {
+                filename = *argv;
+                if (argv[1])   /* shouldn't be any more args after filename */
+                    ++error;
+            } else
+                ++error;   /* not expecting any other options */
+        }
+    }
+
+    if (!filename)
+        ++error;
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+#ifndef __CYGWIN__
+        int ch;
+#endif
+
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
+        readpng2_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-gamma exp] [-bgcolor bg | -bgpat pat] [-timing]\n"
+          "        %*s file.png\n\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images; overrides -bgpat option\n"
+          "    pat \tdesired background pattern number (1-%d); used with\n"
+          "\t\t  transparent images; overrides -bgcolor option\n"
+          "    -timing\tenables delay for every block read, to simulate modem\n"
+          "\t\t  download of image (~36 Kbps)\n"
+          "\nPress Q, Esc or mouse button 1 after image is displayed to quit.\n"
+#ifndef __CYGWIN__
+          "Press Q or Esc to quit this usage screen. ",
+#else
+          ,
+#endif
+          PROGNAME,
+#if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) && \
+    !(defined(__CYGWIN__) || defined(__MINGW32__))
+          (int)strlen(PROGNAME), " ",
+#endif
+          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat);
+        fflush(stderr);
+#ifndef __CYGWIN__
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
+            fprintf(stderr, PROGNAME
+              ":  [%s] is not a PNG file: incorrect signature\n",
+              filename);
+            ++error;
+        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
+            switch (rc) {
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng2_init() error\n");
+                    break;
+            }
+            ++error;
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+#ifndef __CYGWIN__
+        int ch;
+#endif
+
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+#ifndef __CYGWIN__
+        do
+            ch = _getch();
+        while (ch != 'q' && ch != 'Q' && ch != 0x1B);
+#endif
+        exit(2);
+    } else {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, appname);
+#ifndef __CYGWIN__
+        fprintf(stderr,
+          "\n   [console window:  closing this window will terminate %s]\n\n",
+          PROGNAME);
+#endif
+        fflush(stderr);
+    }
+
+
+    /* set the title-bar string, but make sure buffer doesn't overflow */
+
+    alen = strlen(appname);
+    flen = strlen(filename);
+    if (alen + flen + 3 > 1023)
+        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));
+    else
+        sprintf(titlebar, "%s:  %s", appname, filename);
+
+
+    /* set some final rpng2_info variables before entering main data loop */
+
+    if (have_bg) {
+        unsigned r, g, b;   /* this approach quiets compiler warnings */
+
+        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+        rpng2_info.bg_red   = (uch)r;
+        rpng2_info.bg_green = (uch)g;
+        rpng2_info.bg_blue  = (uch)b;
+    } else
+        rpng2_info.need_bgcolor = TRUE;
+
+    rpng2_info.state = kPreInit;
+    rpng2_info.mainprog_init = rpng2_win_init;
+    rpng2_info.mainprog_display_row = rpng2_win_display_row;
+    rpng2_info.mainprog_finish_display = rpng2_win_finish_display;
+
+
+    /* OK, this is the fun part:  call readpng2_decode_data() at the start of
+     * the loop to deal with our first buffer of data (read in above to verify
+     * that the file is a PNG image), then loop through the file and continue
+     * calling the same routine to handle each chunk of data.  It in turn
+     * passes the data to libpng, which will invoke one or more of our call-
+     * backs as decoded data become available.  We optionally call Sleep() for
+     * one second per iteration to simulate downloading the image via an analog
+     * modem. */
+
+    for (;;) {
+        Trace((stderr, "about to call readpng2_decode_data()\n"))
+        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
+            ++error;
+        Trace((stderr, "done with readpng2_decode_data()\n"))
+
+        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
+            if (rpng2_info.state == kDone) {
+                Trace((stderr, "done decoding PNG image\n"))
+            } else if (ferror(infile)) {
+                fprintf(stderr, PROGNAME
+                  ":  error while reading PNG image file\n");
+                exit(3);
+            } else if (feof(infile)) {
+                fprintf(stderr, PROGNAME ":  end of file reached "
+                  "(unexpectedly) while reading PNG image file\n");
+                exit(3);
+            } else /* if (error) */ {
+                /* will print error message below */
+            }
+            break;
+        }
+
+        if (timing)
+            Sleep(1000L);
+
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+    }
+
+
+    /* clean up PNG stuff and report any decoding errors */
+
+    fclose(infile);
+    Trace((stderr, "about to call readpng2_cleanup()\n"))
+    readpng2_cleanup(&rpng2_info);
+
+    if (error) {
+        fprintf(stderr, PROGNAME ":  libpng error while decoding PNG image\n");
+        exit(3);
+    }
+
+
+    /* wait for the user to tell us when to quit */
+
+    while (GetMessage(&msg, NULL, 0, 0)) {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+
+    /* we're done:  clean up all image and Windows resources and go away */
+
+    Trace((stderr, "about to call rpng2_win_cleanup()\n"))
+    rpng2_win_cleanup();
+
+    return msg.wParam;
+}
+
+
+
+
+
+/* this function is called by readpng2_info_callback() in readpng2.c, which
+ * in turn is called by libpng after all of the pre-IDAT chunks have been
+ * read and processed--i.e., we now have enough info to finish initializing */
+
+static void rpng2_win_init()
+{
+    ulg i;
+    ulg rowbytes = rpng2_info.rowbytes;
+
+    Trace((stderr, "beginning rpng2_win_init()\n"))
+    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
+    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
+    Trace((stderr, "  height = %ld\n", rpng2_info.height))
+
+    rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);
+    if (!rpng2_info.image_data) {
+        readpng2_cleanup(&rpng2_info);
+        return;
+    }
+
+    rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));
+    if (!rpng2_info.row_pointers) {
+        free(rpng2_info.image_data);
+        rpng2_info.image_data = NULL;
+        readpng2_cleanup(&rpng2_info);
+        return;
+    }
+
+    for (i = 0;  i < rpng2_info.height;  ++i)
+        rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;
+
+/*---------------------------------------------------------------------------
+    Do the basic Windows initialization stuff, make the window, and fill it
+    with the user-specified, file-specified or default background color.
+  ---------------------------------------------------------------------------*/
+
+    if (rpng2_win_create_window()) {
+        readpng2_cleanup(&rpng2_info);
+        return;
+    }
+
+    rpng2_info.state = kWindowInit;
+}
+
+
+
+
+
+static int rpng2_win_create_window()
+{
+    uch bg_red   = rpng2_info.bg_red;
+    uch bg_green = rpng2_info.bg_green;
+    uch bg_blue  = rpng2_info.bg_blue;
+    uch *dest;
+    int extra_width, extra_height;
+    ulg i, j;
+    WNDCLASSEX wndclass;
+    RECT rect;
+
+
+/*---------------------------------------------------------------------------
+    Allocate memory for the display-specific version of the image (round up
+    to multiple of 4 for Windows DIB).
+  ---------------------------------------------------------------------------*/
+
+    wimage_rowbytes = ((3*rpng2_info.width + 3L) >> 2) << 2;
+
+    if (!(dib = (uch *)malloc(sizeof(BITMAPINFOHEADER) +
+                              wimage_rowbytes*rpng2_info.height)))
+    {
+        return 4;   /* fail */
+    }
+
+/*---------------------------------------------------------------------------
+    Initialize the DIB.  Negative height means to use top-down BMP ordering
+    (must be uncompressed, but that's what we want).  Bit count of 1, 4 or 8
+    implies a colormap of RGBX quads, but 24-bit BMPs just use B,G,R values
+    directly => wimage_data begins immediately after BMP header.
+  ---------------------------------------------------------------------------*/
+
+    memset(dib, 0, sizeof(BITMAPINFOHEADER));
+    bmih = (BITMAPINFOHEADER *)dib;
+    bmih->biSize = sizeof(BITMAPINFOHEADER);
+    bmih->biWidth = rpng2_info.width;
+    bmih->biHeight = -((long)rpng2_info.height);
+    bmih->biPlanes = 1;
+    bmih->biBitCount = 24;
+    bmih->biCompression = 0;
+    wimage_data = dib + sizeof(BITMAPINFOHEADER);
+
+/*---------------------------------------------------------------------------
+    Fill window with the specified background color (default is black), but
+    defer loading faked "background image" until window is displayed (may be
+    slow to compute).  Data are in BGR order.
+  ---------------------------------------------------------------------------*/
+
+    if (bg_image) {   /* just fill with black for now */
+        memset(wimage_data, 0, wimage_rowbytes*rpng2_info.height);
+    } else {
+        for (j = 0;  j < rpng2_info.height;  ++j) {
+            dest = wimage_data + j*wimage_rowbytes;
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                *dest++ = bg_blue;
+                *dest++ = bg_green;
+                *dest++ = bg_red;
+            }
+        }
+    }
+
+/*---------------------------------------------------------------------------
+    Set the window parameters.
+  ---------------------------------------------------------------------------*/
+
+    memset(&wndclass, 0, sizeof(wndclass));
+
+    wndclass.cbSize = sizeof(wndclass);
+    wndclass.style = CS_HREDRAW | CS_VREDRAW;
+    wndclass.lpfnWndProc = rpng2_win_wndproc;
+    wndclass.hInstance = global_hInst;
+    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
+    wndclass.hbrBackground = (HBRUSH)GetStockObject(DKGRAY_BRUSH);
+    wndclass.lpszMenuName = NULL;
+    wndclass.lpszClassName = progname;
+    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
+
+    RegisterClassEx(&wndclass);
+
+/*---------------------------------------------------------------------------
+    Finally, create the window.
+  ---------------------------------------------------------------------------*/
+
+    extra_width  = 2*(GetSystemMetrics(SM_CXBORDER) +
+                      GetSystemMetrics(SM_CXDLGFRAME));
+    extra_height = 2*(GetSystemMetrics(SM_CYBORDER) +
+                      GetSystemMetrics(SM_CYDLGFRAME)) +
+                      GetSystemMetrics(SM_CYCAPTION);
+
+    global_hwnd = CreateWindow(progname, titlebar, WS_OVERLAPPEDWINDOW,
+      CW_USEDEFAULT, CW_USEDEFAULT, rpng2_info.width+extra_width,
+      rpng2_info.height+extra_height, NULL, NULL, global_hInst, NULL);
+
+    ShowWindow(global_hwnd, global_showmode);
+    UpdateWindow(global_hwnd);
+
+/*---------------------------------------------------------------------------
+    Now compute the background image and display it.  If it fails (memory
+    allocation), revert to a plain background color.
+  ---------------------------------------------------------------------------*/
+
+    if (bg_image) {
+        static const char *msg = "Computing background image...";
+        int x, y, len = strlen(msg);
+        HDC hdc = GetDC(global_hwnd);
+        TEXTMETRIC tm;
+
+        GetTextMetrics(hdc, &tm);
+        x = (rpng2_info.width - len*tm.tmAveCharWidth)/2;
+        y = (rpng2_info.height - tm.tmHeight)/2;
+        SetBkMode(hdc, TRANSPARENT);
+        SetTextColor(hdc, GetSysColor(COLOR_HIGHLIGHTTEXT));
+        /* this can still begin out of bounds even if x is positive (???): */
+        TextOut(hdc, ((x < 0)? 0 : x), ((y < 0)? 0 : y), msg, len);
+        ReleaseDC(global_hwnd, hdc);
+
+        rpng2_win_load_bg_image();   /* resets bg_image if fails */
+    }
+
+    if (!bg_image) {
+        for (j = 0;  j < rpng2_info.height;  ++j) {
+            dest = wimage_data + j*wimage_rowbytes;
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                *dest++ = bg_blue;
+                *dest++ = bg_green;
+                *dest++ = bg_red;
+            }
+        }
+    }
+
+    rect.left = 0L;
+    rect.top = 0L;
+    rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */
+    rect.bottom = (LONG)rpng2_info.height;     /* possibly off by one? */
+    InvalidateRect(global_hwnd, &rect, FALSE);
+    UpdateWindow(global_hwnd);                 /* similar to XFlush() */
+
+    return 0;
+
+} /* end function rpng2_win_create_window() */
+
+
+
+
+
+static int rpng2_win_load_bg_image()
+{
+    uch *src, *dest;
+    uch r1, r2, g1, g2, b1, b2;
+    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
+    int k, hmax, max;
+    int xidx, yidx, yidx_max = (bgscale-1);
+    int even_odd_vert, even_odd_horiz, even_odd;
+    int invert_gradient2 = (bg[pat].type & 0x08);
+    int invert_column;
+    ulg i, row;
+
+/*---------------------------------------------------------------------------
+    Allocate buffer for fake background image to be used with transparent
+    images; if this fails, revert to plain background color.
+  ---------------------------------------------------------------------------*/
+
+    bg_rowbytes = 3 * rpng2_info.width;
+    bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);
+    if (!bg_data) {
+        fprintf(stderr, PROGNAME
+          ":  unable to allocate memory for background image\n");
+        bg_image = 0;
+        return 1;
+    }
+
+/*---------------------------------------------------------------------------
+    Vertical gradients (ramps) in NxN squares, alternating direction and
+    colors (N == bgscale).
+  ---------------------------------------------------------------------------*/
+
+    if ((bg[pat].type & 0x07) == 0) {
+        uch r1_min  = rgb[bg[pat].rgb1_min].r;
+        uch g1_min  = rgb[bg[pat].rgb1_min].g;
+        uch b1_min  = rgb[bg[pat].rgb1_min].b;
+        uch r2_min  = rgb[bg[pat].rgb2_min].r;
+        uch g2_min  = rgb[bg[pat].rgb2_min].g;
+        uch b2_min  = rgb[bg[pat].rgb2_min].b;
+        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
+        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
+        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
+        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
+        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
+        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = row % bgscale;
+            even_odd_vert = (row / bgscale) & 1;
+
+            r1 = r1_min + (r1_diff * yidx) / yidx_max;
+            g1 = g1_min + (g1_diff * yidx) / yidx_max;
+            b1 = b1_min + (b1_diff * yidx) / yidx_max;
+            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
+            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
+            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
+
+            r2 = r2_min + (r2_diff * yidx) / yidx_max;
+            g2 = g2_min + (g2_diff * yidx) / yidx_max;
+            b2 = b2_min + (b2_diff * yidx) / yidx_max;
+            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
+            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
+            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
+
+            dest = bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                even_odd_horiz = (i / bgscale) & 1;
+                even_odd = even_odd_vert ^ even_odd_horiz;
+                invert_column =
+                  (even_odd_horiz && (bg[pat].type & 0x10));
+                if (even_odd == 0) {         /* gradient #1 */
+                    if (invert_column) {
+                        *dest++ = r1_inv;
+                        *dest++ = g1_inv;
+                        *dest++ = b1_inv;
+                    } else {
+                        *dest++ = r1;
+                        *dest++ = g1;
+                        *dest++ = b1;
+                    }
+                } else {                     /* gradient #2 */
+                    if ((invert_column && invert_gradient2) ||
+                        (!invert_column && !invert_gradient2))
+                    {
+                        *dest++ = r2;        /* not inverted or */
+                        *dest++ = g2;        /*  doubly inverted */
+                        *dest++ = b2;
+                    } else {
+                        *dest++ = r2_inv;
+                        *dest++ = g2_inv;    /* singly inverted */
+                        *dest++ = b2_inv;
+                    }
+                }
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam
+    M. Costello.
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 1) {
+
+        hmax = (bgscale-1)/2;   /* half the max weight of a color */
+        max = 2*hmax;           /* the max weight of a color */
+
+        r1 = rgb[bg[pat].rgb1_max].r;
+        g1 = rgb[bg[pat].rgb1_max].g;
+        b1 = rgb[bg[pat].rgb1_max].b;
+        r2 = rgb[bg[pat].rgb2_max].r;
+        g2 = rgb[bg[pat].rgb2_max].g;
+        b2 = rgb[bg[pat].rgb2_max].b;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = row % bgscale;
+            if (yidx > hmax)
+                yidx = bgscale-1 - yidx;
+            dest = bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                xidx = i % bgscale;
+                if (xidx > hmax)
+                    xidx = bgscale-1 - xidx;
+                k = xidx + yidx;
+                *dest++ = (k*r1 + (max-k)*r2) / max;
+                *dest++ = (k*g1 + (max-k)*g2) / max;
+                *dest++ = (k*b1 + (max-k)*b2) / max;
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
+    soids will equal bgscale?].  This one is slow but very cool.  Code con-
+    tributed by Pieter S. van der Meulen (originally in Smalltalk).
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 2) {
+        uch ch;
+        int ii, x, y, hw, hh, grayspot;
+        double freq, rotate, saturate, gray, intensity;
+        double angle=0.0, aoffset=0.0, maxDist, dist;
+        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
+
+        fprintf(stderr, "%s:  computing radial background...",
+          PROGNAME);
+        fflush(stderr);
+
+        hh = rpng2_info.height / 2;
+        hw = rpng2_info.width / 2;
+
+        /* variables for radial waves:
+         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
+         *   freq:  number of color beams originating from the center
+         *   grayspot:  size of the graying center area (anti-alias)
+         *   rotate:  rotation of the beams as a function of radius
+         *   saturate:  saturation of beams' shape azimuthally
+         */
+        angle = CLIP(angle, 0.0, 360.0);
+        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
+        freq = MAX((double)bg[pat].bg_freq, 0.0);
+        saturate = (double)bg[pat].bg_bsat * 0.1;
+        rotate = (double)bg[pat].bg_brot * 0.1;
+        gray = 0.0;
+        intensity = 0.0;
+        maxDist = (double)((hw*hw) + (hh*hh));
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            y = row - hh;
+            dest = bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                x = i - hw;
+                angle = (x == 0)? PI_2 : atan((double)y / (double)x);
+                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
+                gray = MIN(1.0, gray);
+                dist = (double)((x*x) + (y*y)) / maxDist;
+                intensity = cos((angle+(rotate*dist*PI)) * freq) *
+                  gray * saturate;
+                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
+                hue = (angle + PI) * INV_PI_360 + aoffset;
+                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
+                s = MIN(MAX(s,0.0), 1.0);
+                v = MIN(MAX(intensity,0.0), 1.0);
+
+                if (s == 0.0) {
+                    ch = (uch)(v * 255.0);
+                    *dest++ = ch;
+                    *dest++ = ch;
+                    *dest++ = ch;
+                } else {
+                    if ((hue < 0.0) || (hue >= 360.0))
+                        hue -= (((int)(hue / 360.0)) * 360.0);
+                    hue /= 60.0;
+                    ii = (int)hue;
+                    f = hue - (double)ii;
+                    p = (1.0 - s) * v;
+                    q = (1.0 - (s * f)) * v;
+                    t = (1.0 - (s * (1.0 - f))) * v;
+                    if      (ii == 0) { red = v; green = t; blue = p; }
+                    else if (ii == 1) { red = q; green = v; blue = p; }
+                    else if (ii == 2) { red = p; green = v; blue = t; }
+                    else if (ii == 3) { red = p; green = q; blue = v; }
+                    else if (ii == 4) { red = t; green = p; blue = v; }
+                    else if (ii == 5) { red = v; green = p; blue = q; }
+                    *dest++ = (uch)(red * 255.0);
+                    *dest++ = (uch)(green * 255.0);
+                    *dest++ = (uch)(blue * 255.0);
+                }
+            }
+        }
+        fprintf(stderr, "done.\n");
+        fflush(stderr);
+    }
+
+/*---------------------------------------------------------------------------
+    Blast background image to display buffer before beginning PNG decode;
+    calling function will handle invalidation and UpdateWindow() call.
+  ---------------------------------------------------------------------------*/
+
+    for (row = 0;  row < rpng2_info.height;  ++row) {
+        src = bg_data + row*bg_rowbytes;
+        dest = wimage_data + row*wimage_rowbytes;
+        for (i = rpng2_info.width;  i > 0;  --i) {
+            r1 = *src++;
+            g1 = *src++;
+            b1 = *src++;
+            *dest++ = b1;
+            *dest++ = g1;   /* note reverse order */
+            *dest++ = r1;
+        }
+    }
+
+    return 0;
+
+} /* end function rpng2_win_load_bg_image() */
+
+
+
+
+
+static void rpng2_win_display_row(ulg row)
+{
+    uch bg_red   = rpng2_info.bg_red;
+    uch bg_green = rpng2_info.bg_green;
+    uch bg_blue  = rpng2_info.bg_blue;
+    uch *src, *src2=NULL, *dest;
+    uch r, g, b, a;
+    ulg i;
+    static int rows=0;
+    static ulg firstrow;
+
+/*---------------------------------------------------------------------------
+    rows and firstrow simply track how many rows (and which ones) have not
+    yet been displayed; alternatively, we could call InvalidateRect() for
+    every row and not bother with the records-keeping.
+  ---------------------------------------------------------------------------*/
+
+    Trace((stderr, "beginning rpng2_win_display_row()\n"))
+
+    if (rows == 0)
+        firstrow = row;   /* first row not yet displayed */
+
+    ++rows;   /* count of rows received but not yet displayed */
+
+/*---------------------------------------------------------------------------
+    Aside from the use of the rpng2_info struct and the lack of an outer
+    loop (over rows), this routine is identical to rpng_win_display_image()
+    in the non-progressive version of the program.
+  ---------------------------------------------------------------------------*/
+
+    src = rpng2_info.image_data + row*rpng2_info.rowbytes;
+    if (bg_image)
+        src2 = bg_data + row*bg_rowbytes;
+    dest = wimage_data + row*wimage_rowbytes;
+
+    if (rpng2_info.channels == 3) {
+        for (i = rpng2_info.width;  i > 0;  --i) {
+            r = *src++;
+            g = *src++;
+            b = *src++;
+            *dest++ = b;
+            *dest++ = g;   /* note reverse order */
+            *dest++ = r;
+        }
+    } else /* if (rpng2_info.channels == 4) */ {
+        for (i = rpng2_info.width;  i > 0;  --i) {
+            r = *src++;
+            g = *src++;
+            b = *src++;
+            a = *src++;
+            if (bg_image) {
+                bg_red   = *src2++;
+                bg_green = *src2++;
+                bg_blue  = *src2++;
+            }
+            if (a == 255) {
+                *dest++ = b;
+                *dest++ = g;
+                *dest++ = r;
+            } else if (a == 0) {
+                *dest++ = bg_blue;
+                *dest++ = bg_green;
+                *dest++ = bg_red;
+            } else {
+                /* this macro (copied from png.h) composites the
+                 * foreground and background values and puts the
+                 * result into the first argument; there are no
+                 * side effects with the first argument */
+                alpha_composite(*dest++, b, a, bg_blue);
+                alpha_composite(*dest++, g, a, bg_green);
+                alpha_composite(*dest++, r, a, bg_red);
+            }
+        }
+    }
+
+/*---------------------------------------------------------------------------
+    Display after every 16 rows or when on last row.  (Region may include
+    previously displayed lines due to interlacing--i.e., not contiguous.)
+  ---------------------------------------------------------------------------*/
+
+    if ((rows & 0xf) == 0 || row == rpng2_info.height-1) {
+        RECT rect;
+
+        rect.left = 0L;
+        rect.top = (LONG)firstrow;
+        rect.right = (LONG)rpng2_info.width;       /* possibly off by one? */
+        rect.bottom = (LONG)row + 1L;              /* possibly off by one? */
+        InvalidateRect(global_hwnd, &rect, FALSE);
+        UpdateWindow(global_hwnd);                 /* similar to XFlush() */
+        rows = 0;
+    }
+
+} /* end function rpng2_win_display_row() */
+
+
+
+
+
+static void rpng2_win_finish_display()
+{
+    Trace((stderr, "beginning rpng2_win_finish_display()\n"))
+
+    /* last row has already been displayed by rpng2_win_display_row(), so
+     * we have nothing to do here except set a flag and let the user know
+     * that the image is done */
+
+    rpng2_info.state = kDone;
+    printf(
+#ifndef __CYGWIN__
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n"
+#else
+      "Done.  Press mouse button 1 (within image window) to quit.\n"
+#endif
+    );
+    fflush(stdout);
+}
+
+
+
+
+
+static void rpng2_win_cleanup()
+{
+    if (bg_image && bg_data) {
+        free(bg_data);
+        bg_data = NULL;
+    }
+
+    if (rpng2_info.image_data) {
+        free(rpng2_info.image_data);
+        rpng2_info.image_data = NULL;
+    }
+
+    if (rpng2_info.row_pointers) {
+        free(rpng2_info.row_pointers);
+        rpng2_info.row_pointers = NULL;
+    }
+
+    if (dib) {
+        free(dib);
+        dib = NULL;
+    }
+}
+
+
+
+
+
+LRESULT CALLBACK rpng2_win_wndproc(HWND hwnd, UINT iMsg, WPARAM wP, LPARAM lP)
+{
+    HDC         hdc;
+    PAINTSTRUCT ps;
+    int rc;
+
+    switch (iMsg) {
+        case WM_CREATE:
+            /* one-time processing here, if any */
+            return 0;
+
+        case WM_PAINT:
+            hdc = BeginPaint(hwnd, &ps);
+            rc = StretchDIBits(hdc, 0, 0, rpng2_info.width, rpng2_info.height,
+                                    0, 0, rpng2_info.width, rpng2_info.height,
+                                    wimage_data, (BITMAPINFO *)bmih,
+                                    0, SRCCOPY);
+            EndPaint(hwnd, &ps);
+            return 0;
+
+        /* wait for the user to tell us when to quit */
+        case WM_CHAR:
+            switch (wP) {       /* only need one, so ignore repeat count */
+                case 'q':
+                case 'Q':
+                case 0x1B:      /* Esc key */
+                    PostQuitMessage(0);
+            }
+            return 0;
+
+        case WM_LBUTTONDOWN:    /* another way of quitting */
+        case WM_DESTROY:
+            PostQuitMessage(0);
+            return 0;
+    }
+
+    return DefWindowProc(hwnd, iMsg, wP, lP);
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c
index 6c687db..7f24b63 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/rpng2-x.c
@@ -1,2107 +1,2107 @@
-/*---------------------------------------------------------------------------

-

-   rpng2 - progressive-model PNG display program                  rpng2-x.c

-

-   This program decodes and displays PNG files progressively, as if it were

-   a web browser (though the front end is only set up to read from files).

-   It supports gamma correction, user-specified background colors, and user-

-   specified background patterns (for transparent images).  This version is

-   for the X Window System (tested by the author under Unix and by Martin

-   Zinser under OpenVMS; may work under OS/2 with a little tweaking).

-

-   Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"

-   and "radial waves" patterns, respectively.

-

-   to do (someday, maybe):

-    - fix expose/redraw code:  don't draw entire row if only part exposed

-    - 8-bit (colormapped) X support

-    - finish resizable checkerboard-gradient (sizes 4-128?)

-    - use %.1023s to simplify truncation of title-bar string?

-

-  ---------------------------------------------------------------------------

-

-   Changelog:

-    - 1.01:  initial public release

-    - 1.02:  modified to allow abbreviated options; fixed char/uchar mismatch

-    - 1.10:  added support for non-default visuals; fixed X pixel-conversion

-    - 1.11:  added -usleep option for demos; fixed command-line parsing bug

-    - 1.12:  added -pause option for demos and testing

-    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options

-    - 1.21:  fixed some small X memory leaks (thanks to François Petitjean)

-    - 1.22:  fixed XFreeGC() crash bug (thanks to Patrick Welche)

-    - 1.23:  added -bgpat 0 mode (std white/gray checkerboard, 8x8 squares)

-    - 1.30:  added -loop option for -bgpat (ifdef FEATURE_LOOP); fixed bpp =

-              24; added support for X resources (thanks to Gerhard Niklasch)

-    - 1.31:  added code to skip unused chunks (thanks to Glenn Randers-Pehrson)

-    - 1.32:  added AMD64/EM64T support (__x86_64__); added basic expose/redraw

-              handling

-    - 2.00:  dual-licensed (added GNU GPL)

-    - 2.01:  fixed 64-bit typo in readpng2.c; fixed -pause usage description

-    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed

-              unexpected-EOF and file-read-error cases; fixed Trace() cut-and-

-              paste bugs

-    - 2.03:  deleted runtime MMX-enabling/disabling and obsolete -mmx* options

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#define PROGNAME  "rpng2-x"

-#define LONGNAME  "Progressive PNG Viewer for X"

-#define VERSION   "2.03 of 25 February 2010"

-#define RESNAME   "rpng2"       /* our X resource application name */

-#define RESCLASS  "Rpng"       /* our X resource class name */

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <ctype.h>

-#include <string.h>

-#include <setjmp.h>       /* for jmpbuf declaration in readpng2.h */

-#include <time.h>

-#include <math.h>         /* only for PvdM background code */

-#include <X11/Xlib.h>

-#include <X11/Xutil.h>

-#include <X11/Xos.h>

-#include <X11/keysym.h>   /* defines XK_* macros */

-

-#ifdef VMS

-#  include <unistd.h>

-#endif

-

-/* all for PvdM background code: */

-#ifndef PI

-#  define PI             3.141592653589793238

-#endif

-#define PI_2             (PI*0.5)

-#define INV_PI_360       (360.0 / PI)

-#define MAX(a,b)         (a>b?a:b)

-#define MIN(a,b)         (a<b?a:b)

-#define CLIP(a,min,max)  MAX(min,MIN((a),max))

-#define ABS(a)           ((a)<0?-(a):(a))

-#define CLIP8P(c)        MAX(0,(MIN((c),255)))   /* 8-bit pos. integer (uch) */

-#define ROUNDF(f)        ((int)(f + 0.5))

-

-#define QUIT(e,k) ((e.type == ButtonPress && e.xbutton.button == Button1) ||  \

-                  (e.type == KeyPress &&   /*  v--- or 1 for shifted keys */  \

-                  ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape)))

-

-#define NO_24BIT_MASKS /* undef case not fully written--only for redisplay() */

-

-#define rgb1_max   bg_freq

-#define rgb1_min   bg_gray

-#define rgb2_max   bg_bsat

-#define rgb2_min   bg_brot

-

-/* #define DEBUG */     /* this enables the Trace() macros */

-

-#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */

-

-

-/* could just include png.h, but this macro is the only thing we need

- * (name and typedefs changed to local versions); note that side effects

- * only happen with alpha (which could easily be avoided with

- * "ush acopy = (alpha);") */

-

-#define alpha_composite(composite, fg, alpha, bg) {               \

-    ush temp = ((ush)(fg)*(ush)(alpha) +                          \

-                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \

-    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \

-}

-

-

-#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this

-                          *  block size corresponds roughly to a download

-                          *  speed 10% faster than theoretical 33.6K maximum

-                          *  (assuming 8 data bits, 1 stop bit and no other

-                          *  overhead) */

-

-/* local prototypes */

-static void rpng2_x_init (void);

-static int  rpng2_x_create_window (void);

-static int  rpng2_x_load_bg_image (void);

-static void rpng2_x_display_row (ulg row);

-static void rpng2_x_finish_display (void);

-static void rpng2_x_redisplay_image (ulg startcol, ulg startrow,

-                                     ulg width, ulg height);

-#ifdef FEATURE_LOOP

-static void rpng2_x_reload_bg_image (void);

-static int  is_number (char *p);

-#endif

-static void rpng2_x_cleanup (void);

-static int  rpng2_x_msb (ulg u32val);

-

-

-static char titlebar[1024], *window_name = titlebar;

-static char *appname = LONGNAME;

-static char *icon_name = PROGNAME;

-static char *res_name = RESNAME;

-static char *res_class = RESCLASS;

-static char *filename;

-static FILE *infile;

-

-static mainprog_info rpng2_info;

-

-static uch inbuf[INBUFSIZE];

-static int incount;

-

-static int pat = 6;        /* must be less than num_bgpat */

-static int bg_image = 0;

-static int bgscale, bgscale_default = 16;

-static ulg bg_rowbytes;

-static uch *bg_data;

-

-int pause_after_pass = FALSE;

-int demo_timing = FALSE;

-ulg usleep_duration = 0L;

-

-static struct rgb_color {

-    uch r, g, b;

-} rgb[] = {

-    {  0,   0,   0},    /*  0:  black */

-    {255, 255, 255},    /*  1:  white */

-    {173, 132,  57},    /*  2:  tan */

-    { 64, 132,   0},    /*  3:  medium green */

-    {189, 117,   1},    /*  4:  gold */

-    {253, 249,   1},    /*  5:  yellow */

-    {  0,   0, 255},    /*  6:  blue */

-    {  0,   0, 120},    /*  7:  medium blue */

-    {255,   0, 255},    /*  8:  magenta */

-    { 64,   0,  64},    /*  9:  dark magenta */

-    {255,   0,   0},    /* 10:  red */

-    { 64,   0,   0},    /* 11:  dark red */

-    {255, 127,   0},    /* 12:  orange */

-    {192,  96,   0},    /* 13:  darker orange */

-    { 24,  60,   0},    /* 14:  dark green-yellow */

-    { 85, 125, 200},    /* 15:  ice blue */

-    {192, 192, 192}     /* 16:  Netscape/Mosaic gray */

-};

-/* not used for now, but should be for error-checking:

-static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);

- */

-

-/*

-    This whole struct is a fairly cheesy way to keep the number of

-    command-line options to a minimum.  The radial-waves background

-    type is a particularly poor fit to the integer elements of the

-    struct...but a few macros and a little fixed-point math will do

-    wonders for ya.

-

-    type bits:

-       F E D C B A 9 8 7 6 5 4 3 2 1 0

-                             | | | | |

-                             | | +-+-+-- 0 = sharp-edged checkerboard

-                             | |         1 = soft diamonds

-                             | |         2 = radial waves

-                             | |       3-7 = undefined

-                             | +-- gradient #2 inverted?

-                             +-- alternating columns inverted?

- */

-static struct background_pattern {

-    ush type;

-    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */

-    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/

-} bg[] = {

-    {0,     1,1, 16,16},        /* checkered:  white vs. light gray (basic) */

-    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */

-    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */

-    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */

-    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */

-    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */

-    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */

-    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */

-    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */

-    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */

-    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */

-    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */

-    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */

-    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */

-    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */

-    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */

-    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */

-};

-static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);

-

-

-/* X-specific variables */

-static char *displayname;

-static XImage *ximage;

-static Display *display;

-static int depth;

-static Visual *visual;

-static XVisualInfo *visual_list;

-static int RShift, GShift, BShift;

-static ulg RMask, GMask, BMask;

-static Window window;

-static GC gc;

-static Colormap colormap;

-

-static int have_nondefault_visual = FALSE;

-static int have_colormap = FALSE;

-static int have_window = FALSE;

-static int have_gc = FALSE;

-

-

-

-

-int main(int argc, char **argv)

-{

-#ifdef sgi

-    char tmpline[80];

-#endif

-    char *p, *bgstr = NULL;

-    int rc, alen, flen;

-    int error = 0;

-    int timing = FALSE;

-    int have_bg = FALSE;

-#ifdef FEATURE_LOOP

-    int loop = FALSE;

-    long loop_interval = -1;            /* seconds (100,000 max) */

-#endif

-    double LUT_exponent;                /* just the lookup table */

-    double CRT_exponent = 2.2;          /* just the monitor */

-    double default_display_exponent;    /* whole display system */

-    XEvent e;

-    KeySym k;

-

-

-    /* First initialize a few things, just to be sure--memset takes care of

-     * default background color (black), booleans (FALSE), pointers (NULL),

-     * etc. */

-

-    displayname = (char *)NULL;

-    filename = (char *)NULL;

-    memset(&rpng2_info, 0, sizeof(mainprog_info));

-

-

-    /* Set the default value for our display-system exponent, i.e., the

-     * product of the CRT exponent and the exponent corresponding to

-     * the frame-buffer's lookup table (LUT), if any.  This is not an

-     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird

-     * ones), but it should cover 99% of the current possibilities. */

-

-#if defined(NeXT)

-    /* third-party utilities can modify the default LUT exponent */

-    LUT_exponent = 1.0 / 2.2;

-    /*

-    if (some_next_function_that_returns_gamma(&next_gamma))

-        LUT_exponent = 1.0 / next_gamma;

-     */

-#elif defined(sgi)

-    LUT_exponent = 1.0 / 1.7;

-    /* there doesn't seem to be any documented function to

-     * get the "gamma" value, so we do it the hard way */

-    infile = fopen("/etc/config/system.glGammaVal", "r");

-    if (infile) {

-        double sgi_gamma;

-

-        fgets(tmpline, 80, infile);

-        fclose(infile);

-        sgi_gamma = atof(tmpline);

-        if (sgi_gamma > 0.0)

-            LUT_exponent = 1.0 / sgi_gamma;

-    }

-#elif defined(Macintosh)

-    LUT_exponent = 1.8 / 2.61;

-    /*

-    if (some_mac_function_that_returns_gamma(&mac_gamma))

-        LUT_exponent = mac_gamma / 2.61;

-     */

-#else

-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */

-#endif

-

-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */

-    default_display_exponent = LUT_exponent * CRT_exponent;

-

-

-    /* If the user has set the SCREEN_GAMMA environment variable as suggested

-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise

-     * use the default value we just calculated.  Either way, the user may

-     * override this via a command-line option. */

-

-    if ((p = getenv("SCREEN_GAMMA")) != NULL)

-        rpng2_info.display_exponent = atof(p);

-    else

-        rpng2_info.display_exponent = default_display_exponent;

-

-

-    /* Now parse the command line for options and the PNG filename. */

-

-    while (*++argv && !error) {

-        if (!strncmp(*argv, "-display", 2)) {

-            if (!*++argv)

-                ++error;

-            else

-                displayname = *argv;

-        } else if (!strncmp(*argv, "-gamma", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                rpng2_info.display_exponent = atof(*argv);

-                if (rpng2_info.display_exponent <= 0.0)

-                    ++error;

-            }

-        } else if (!strncmp(*argv, "-bgcolor", 4)) {

-            if (!*++argv)

-                ++error;

-            else {

-                bgstr = *argv;

-                if (strlen(bgstr) != 7 || bgstr[0] != '#')

-                    ++error;

-                else {

-                    have_bg = TRUE;

-                    bg_image = FALSE;

-                }

-            }

-        } else if (!strncmp(*argv, "-bgpat", 4)) {

-            if (!*++argv)

-                ++error;

-            else {

-                pat = atoi(*argv);

-                if (pat >= 0 && pat < num_bgpat) {

-                    bg_image = TRUE;

-                    have_bg = FALSE;

-                } else

-                    ++error;

-            }

-        } else if (!strncmp(*argv, "-usleep", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                usleep_duration = (ulg)atol(*argv);

-                demo_timing = TRUE;

-            }

-        } else if (!strncmp(*argv, "-pause", 2)) {

-            pause_after_pass = TRUE;

-        } else if (!strncmp(*argv, "-timing", 2)) {

-            timing = TRUE;

-#ifdef FEATURE_LOOP

-        } else if (!strncmp(*argv, "-loop", 2)) {

-            loop = TRUE;

-            if (!argv[1] || !is_number(argv[1]))

-                loop_interval = 2;

-            else {

-                ++argv;

-                loop_interval = atol(*argv);

-                if (loop_interval < 0)

-                    loop_interval = 2;

-                else if (loop_interval > 100000)   /* bit more than one day */

-                    loop_interval = 100000;

-            }

-#endif

-        } else {

-            if (**argv != '-') {

-                filename = *argv;

-                if (argv[1])   /* shouldn't be any more args after filename */

-                    ++error;

-            } else

-                ++error;   /* not expecting any other options */

-        }

-    }

-

-    if (!filename)

-        ++error;

-

-

-    /* print usage screen if any errors up to this point */

-

-    if (error) {

-        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);

-        readpng2_version_info();

-        fprintf(stderr, "\n"

-          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"

-#ifdef FEATURE_LOOP

-          "        %*s [-usleep dur | -timing] [-pause] [-loop [sec]] file.png\n\n"

-#else

-          "        %*s [-usleep dur | -timing] [-pause] file.png\n\n"

-#endif

-          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"

-          "    exp \ttransfer-function exponent (``gamma'') of the display\n"

-          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"

-          "\t\t  to the product of the lookup-table exponent (varies)\n"

-          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"

-          "    bg  \tdesired background color in 7-character hex RGB format\n"

-          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"

-          "\t\t  used with transparent images; overrides -bgpat\n"

-          "    pat \tdesired background pattern number (0-%d); used with\n"

-          "\t\t  transparent images; overrides -bgcolor\n"

-#ifdef FEATURE_LOOP

-          "    -loop\tloops through background images after initial display\n"

-          "\t\t  is complete (depends on -bgpat)\n"

-          "    sec \tseconds to display each background image (default = 2)\n"

-#endif

-          "    dur \tduration in microseconds to wait after displaying each\n"

-          "\t\t  row (for demo purposes)\n"

-          "    -timing\tenables delay for every block read, to simulate modem\n"

-          "\t\t  download of image (~36 Kbps)\n"

-          "    -pause\tpauses after displaying each pass until mouse clicked\n"

-          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"

-          "is displayed) to quit.\n"

-          "\n", PROGNAME,

-          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat-1);

-        exit(1);

-    }

-

-

-    if (!(infile = fopen(filename, "rb"))) {

-        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);

-        ++error;

-    } else {

-        incount = fread(inbuf, 1, INBUFSIZE, infile);

-        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {

-            fprintf(stderr, PROGNAME

-              ":  [%s] is not a PNG file: incorrect signature\n",

-              filename);

-            ++error;

-        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {

-            switch (rc) {

-                case 2:

-                    fprintf(stderr, PROGNAME

-                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);

-                    break;

-                case 4:

-                    fprintf(stderr, PROGNAME ":  insufficient memory\n");

-                    break;

-                default:

-                    fprintf(stderr, PROGNAME

-                      ":  unknown readpng2_init() error\n");

-                    break;

-            }

-            ++error;

-        } else {

-            Trace((stderr, "about to call XOpenDisplay()\n"))

-            display = XOpenDisplay(displayname);

-            if (!display) {

-                readpng2_cleanup(&rpng2_info);

-                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",

-                  displayname? displayname : "default");

-                ++error;

-            }

-        }

-        if (error)

-            fclose(infile);

-    }

-

-

-    if (error) {

-        fprintf(stderr, PROGNAME ":  aborting.\n");

-        exit(2);

-    }

-

-

-    /* set the title-bar string, but make sure buffer doesn't overflow */

-

-    alen = strlen(appname);

-    flen = strlen(filename);

-    if (alen + flen + 3 > 1023)

-        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));

-    else

-        sprintf(titlebar, "%s:  %s", appname, filename);

-

-

-    /* set some final rpng2_info variables before entering main data loop */

-

-    if (have_bg) {

-        unsigned r, g, b;   /* this approach quiets compiler warnings */

-

-        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);

-        rpng2_info.bg_red   = (uch)r;

-        rpng2_info.bg_green = (uch)g;

-        rpng2_info.bg_blue  = (uch)b;

-    } else

-        rpng2_info.need_bgcolor = TRUE;

-

-    rpng2_info.state = kPreInit;

-    rpng2_info.mainprog_init = rpng2_x_init;

-    rpng2_info.mainprog_display_row = rpng2_x_display_row;

-    rpng2_info.mainprog_finish_display = rpng2_x_finish_display;

-

-

-    /* OK, this is the fun part:  call readpng2_decode_data() at the start of

-     * the loop to deal with our first buffer of data (read in above to verify

-     * that the file is a PNG image), then loop through the file and continue

-     * calling the same routine to handle each chunk of data.  It in turn

-     * passes the data to libpng, which will invoke one or more of our call-

-     * backs as decoded data become available.  We optionally call sleep() for

-     * one second per iteration to simulate downloading the image via an analog

-     * modem. */

-

-    for (;;) {

-        Trace((stderr, "about to call readpng2_decode_data()\n"))

-        if (readpng2_decode_data(&rpng2_info, inbuf, incount))

-            ++error;

-        Trace((stderr, "done with readpng2_decode_data()\n"))

-

-        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {

-            if (rpng2_info.state == kDone) {

-                Trace((stderr, "done decoding PNG image\n"))

-            } else if (ferror(infile)) {

-                fprintf(stderr, PROGNAME

-                  ":  error while reading PNG image file\n");

-                exit(3);

-            } else if (feof(infile)) {

-                fprintf(stderr, PROGNAME ":  end of file reached "

-                  "(unexpectedly) while reading PNG image file\n");

-                exit(3);

-            } else /* if (error) */ {

-                /* will print error message below */

-            }

-            break;

-        }

-

-        if (timing)

-            sleep(1);

-

-        incount = fread(inbuf, 1, INBUFSIZE, infile);

-    }

-

-

-    /* clean up PNG stuff and report any decoding errors */

-

-    fclose(infile);

-    Trace((stderr, "about to call readpng2_cleanup()\n"))

-    readpng2_cleanup(&rpng2_info);

-

-    if (error) {

-        fprintf(stderr, PROGNAME ":  libpng error while decoding PNG image\n");

-        exit(3);

-    }

-

-

-#ifdef FEATURE_LOOP

-

-    if (loop && bg_image) {

-        Trace((stderr, "entering -loop loop (FEATURE_LOOP)\n"))

-        for (;;) {

-            int i, use_sleep;

-            struct timeval now, then;

-

-            /* get current time and add loop_interval to get target time */

-            if (gettimeofday(&then, NULL) == 0) {

-                then.tv_sec += loop_interval;

-                use_sleep = FALSE;

-            } else

-                use_sleep = TRUE;

-

-            /* do quick check for a quit event but don't wait for it */

-            /* GRR BUG:  should also check for Expose events and redraw... */

-            if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask, &e))

-                if (QUIT(e,k))

-                    break;

-

-            /* generate next background image */

-            if (++pat >= num_bgpat)

-                pat = 0;

-            rpng2_x_reload_bg_image();

-

-            /* wait for timeout, using whatever means are available */

-            if (use_sleep || gettimeofday(&now, NULL) != 0) {

-                for (i = loop_interval;  i > 0;  --i) {

-                    sleep(1);

-                    /* GRR BUG:  also need to check for Expose (and redraw!) */

-                    if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask,

-                        &e) && QUIT(e,k))

-                        break;

-                }

-            } else {

-                /* Y2038 BUG! */

-                if (now.tv_sec < then.tv_sec ||

-                    (now.tv_sec == then.tv_sec && now.tv_usec < then.tv_usec))

-                {

-                    int quit = FALSE;

-                    long seconds_to_go = then.tv_sec - now.tv_sec;

-                    long usleep_usec;

-

-                    /* basically chew up most of remaining loop-interval with

-                     *  calls to sleep(1) interleaved with checks for quit

-                     *  events, but also recalc time-to-go periodically; when

-                     *  done, clean up any remaining time with usleep() call

-                     *  (could also use SIGALRM, but signals are a pain...) */

-                    while (seconds_to_go-- > 1) {

-                        int seconds_done = 0;

-

-                        for (i = seconds_to_go;  i > 0 && !quit;  --i) {

-                            sleep(1);

-                            /* GRR BUG:  need to check for Expose and redraw */

-                            if (XCheckMaskEvent(display, KeyPressMask |

-                                ButtonPressMask, &e) && QUIT(e,k))

-                                quit = TRUE;

-                            if (++seconds_done > 1000)

-                                break;   /* time to redo seconds_to_go meas. */

-                        }

-                        if (quit)

-                            break;

-

-                        /* OK, more than 1000 seconds since last check:

-                         *  correct the time-to-go measurement for drift */

-                        if (gettimeofday(&now, NULL) == 0) {

-                            if (now.tv_sec >= then.tv_sec)

-                                break;

-                            seconds_to_go = then.tv_sec - now.tv_sec;

-                        } else

-                            ++seconds_to_go;  /* restore what we subtracted */

-                    }

-                    if (quit)

-                        break;   /* breaks outer do-loop, skips redisplay */

-

-                    /* since difference between "now" and "then" is already

-                     *  eaten up to within a couple of seconds, don't need to

-                     *  worry about overflow--but might have overshot (neg.) */

-                    if (gettimeofday(&now, NULL) == 0) {

-                        usleep_usec = 1000000L*(then.tv_sec - now.tv_sec) +

-                          then.tv_usec - now.tv_usec;

-                        if (usleep_usec > 0)

-                            usleep((ulg)usleep_usec);

-                    }

-                }

-            }

-

-            /* composite image against new background and display (note that

-             *  we do not take into account the time spent doing this...) */

-            rpng2_x_redisplay_image (0, 0, rpng2_info.width, rpng2_info.height);

-        }

-

-    } else /* FALL THROUGH and do the normal thing */

-

-#endif /* FEATURE_LOOP */

-

-    /* wait for the user to tell us when to quit */

-

-    if (rpng2_info.state >= kWindowInit) {

-        Trace((stderr, "entering final wait-for-quit-event loop\n"))

-        do {

-            XNextEvent(display, &e);

-            if (e.type == Expose) {

-                XExposeEvent *ex = (XExposeEvent *)&e;

-                rpng2_x_redisplay_image (ex->x, ex->y, ex->width, ex->height);

-            }

-        } while (!QUIT(e,k));

-    } else {

-        fprintf(stderr, PROGNAME ":  init callback never called:  probable "

-          "libpng error while decoding PNG metadata\n");

-        exit(4);

-    }

-

-

-    /* we're done:  clean up all image and X resources and go away */

-

-    Trace((stderr, "about to call rpng2_x_cleanup()\n"))

-    rpng2_x_cleanup();

-

-    return 0;

-}

-

-

-

-

-

-/* this function is called by readpng2_info_callback() in readpng2.c, which

- * in turn is called by libpng after all of the pre-IDAT chunks have been

- * read and processed--i.e., we now have enough info to finish initializing */

-

-static void rpng2_x_init(void)

-{

-    ulg i;

-    ulg rowbytes = rpng2_info.rowbytes;

-

-    Trace((stderr, "beginning rpng2_x_init()\n"))

-    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))

-    Trace((stderr, "  width  = %ld\n", rpng2_info.width))

-    Trace((stderr, "  height = %ld\n", rpng2_info.height))

-

-    rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);

-    if (!rpng2_info.image_data) {

-        readpng2_cleanup(&rpng2_info);

-        return;

-    }

-

-    rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));

-    if (!rpng2_info.row_pointers) {

-        free(rpng2_info.image_data);

-        rpng2_info.image_data = NULL;

-        readpng2_cleanup(&rpng2_info);

-        return;

-    }

-

-    for (i = 0;  i < rpng2_info.height;  ++i)

-        rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;

-

-

-    /* do the basic X initialization stuff, make the window, and fill it with

-     * the user-specified, file-specified or default background color or

-     * pattern */

-

-    if (rpng2_x_create_window()) {

-

-        /* GRR TEMPORARY HACK:  this is fundamentally no different from cases

-         * above; libpng should call our error handler to longjmp() back to us

-         * when png_ptr goes away.  If we/it segfault instead, seems like a

-         * libpng bug... */

-

-        /* we're here via libpng callback, so if window fails, clean and bail */

-        readpng2_cleanup(&rpng2_info);

-        rpng2_x_cleanup();

-        exit(2);

-    }

-

-    rpng2_info.state = kWindowInit;

-}

-

-

-

-

-

-static int rpng2_x_create_window(void)

-{

-    ulg bg_red   = rpng2_info.bg_red;

-    ulg bg_green = rpng2_info.bg_green;

-    ulg bg_blue  = rpng2_info.bg_blue;

-    ulg bg_pixel = 0L;

-    ulg attrmask;

-    int need_colormap = FALSE;

-    int screen, pad;

-    uch *xdata;

-    Window root;

-    XEvent e;

-    XGCValues gcvalues;

-    XSetWindowAttributes attr;

-    XTextProperty windowName, *pWindowName = &windowName;

-    XTextProperty iconName, *pIconName = &iconName;

-    XVisualInfo visual_info;

-    XSizeHints *size_hints;

-    XWMHints *wm_hints;

-    XClassHint *class_hints;

-

-

-    Trace((stderr, "beginning rpng2_x_create_window()\n"))

-

-    screen = DefaultScreen(display);

-    depth = DisplayPlanes(display, screen);

-    root = RootWindow(display, screen);

-

-#ifdef DEBUG

-    XSynchronize(display, True);

-#endif

-

-    if (depth != 16 && depth != 24 && depth != 32) {

-        int visuals_matched = 0;

-

-        Trace((stderr, "default depth is %d:  checking other visuals\n",

-          depth))

-

-        /* 24-bit first */

-        visual_info.screen = screen;

-        visual_info.depth = 24;

-        visual_list = XGetVisualInfo(display,

-          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);

-        if (visuals_matched == 0) {

-/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */

-            fprintf(stderr, "default screen depth %d not supported, and no"

-              " 24-bit visuals found\n", depth);

-            return 2;

-        }

-        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",

-          visuals_matched))

-        visual = visual_list[0].visual;

-        depth = visual_list[0].depth;

-/*

-        colormap_size = visual_list[0].colormap_size;

-        visual_class = visual->class;

-        visualID = XVisualIDFromVisual(visual);

- */

-        have_nondefault_visual = TRUE;

-        need_colormap = TRUE;

-    } else {

-        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);

-        visual = visual_info.visual;

-    }

-

-    RMask = visual->red_mask;

-    GMask = visual->green_mask;

-    BMask = visual->blue_mask;

-

-/* GRR:  add/check 8-bit support */

-    if (depth == 8 || need_colormap) {

-        colormap = XCreateColormap(display, root, visual, AllocNone);

-        if (!colormap) {

-            fprintf(stderr, "XCreateColormap() failed\n");

-            return 2;

-        }

-        have_colormap = TRUE;

-        if (depth == 8)

-            bg_image = FALSE;   /* gradient just wastes palette entries */

-    }

-    if (depth == 15 || depth == 16) {

-        RShift = 15 - rpng2_x_msb(RMask);    /* these are right-shifts */

-        GShift = 15 - rpng2_x_msb(GMask);

-        BShift = 15 - rpng2_x_msb(BMask);

-    } else if (depth > 16) {

-        RShift = rpng2_x_msb(RMask) - 7;     /* these are left-shifts */

-        GShift = rpng2_x_msb(GMask) - 7;

-        BShift = rpng2_x_msb(BMask) - 7;

-    }

-    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {

-        fprintf(stderr, "rpng2 internal logic error:  negative X shift(s)!\n");

-        return 2;

-    }

-

-/*---------------------------------------------------------------------------

-    Finally, create the window.

-  ---------------------------------------------------------------------------*/

-

-    attr.backing_store = Always;

-    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;

-    attrmask = CWBackingStore | CWEventMask;

-    if (have_nondefault_visual) {

-        attr.colormap = colormap;

-        attr.background_pixel = 0;

-        attr.border_pixel = 1;

-        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;

-    }

-

-    window = XCreateWindow(display, root, 0, 0, rpng2_info.width,

-      rpng2_info.height, 0, depth, InputOutput, visual, attrmask, &attr);

-

-    if (window == None) {

-        fprintf(stderr, "XCreateWindow() failed\n");

-        return 2;

-    } else

-        have_window = TRUE;

-

-    if (depth == 8)

-        XSetWindowColormap(display, window, colormap);

-

-    if (!XStringListToTextProperty(&window_name, 1, pWindowName))

-        pWindowName = NULL;

-    if (!XStringListToTextProperty(&icon_name, 1, pIconName))

-        pIconName = NULL;

-

-    /* OK if either hints allocation fails; XSetWMProperties() allows NULLs */

-

-    if ((size_hints = XAllocSizeHints()) != NULL) {

-        /* window will not be resizable */

-        size_hints->flags = PMinSize | PMaxSize;

-        size_hints->min_width = size_hints->max_width = (int)rpng2_info.width;

-        size_hints->min_height = size_hints->max_height =

-          (int)rpng2_info.height;

-    }

-

-    if ((wm_hints = XAllocWMHints()) != NULL) {

-        wm_hints->initial_state = NormalState;

-        wm_hints->input = True;

-     /* wm_hints->icon_pixmap = icon_pixmap; */

-        wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;

-    }

-

-    if ((class_hints = XAllocClassHint()) != NULL) {

-        class_hints->res_name = res_name;

-        class_hints->res_class = res_class;

-    }

-

-    XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,

-      size_hints, wm_hints, class_hints);

-

-    /* various properties and hints no longer needed; free memory */

-    if (pWindowName)

-       XFree(pWindowName->value);

-    if (pIconName)

-       XFree(pIconName->value);

-    if (size_hints)

-        XFree(size_hints);

-    if (wm_hints)

-       XFree(wm_hints);

-    if (class_hints)

-       XFree(class_hints);

-

-    XMapWindow(display, window);

-

-    gc = XCreateGC(display, window, 0, &gcvalues);

-    have_gc = TRUE;

-

-/*---------------------------------------------------------------------------

-    Allocate memory for the X- and display-specific version of the image.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        xdata = (uch *)malloc(4*rpng2_info.width*rpng2_info.height);

-        pad = 32;

-    } else if (depth == 16) {

-        xdata = (uch *)malloc(2*rpng2_info.width*rpng2_info.height);

-        pad = 16;

-    } else /* depth == 8 */ {

-        xdata = (uch *)malloc(rpng2_info.width*rpng2_info.height);

-        pad = 8;

-    }

-

-    if (!xdata) {

-        fprintf(stderr, PROGNAME ":  unable to allocate image memory\n");

-        return 4;

-    }

-

-    ximage = XCreateImage(display, visual, depth, ZPixmap, 0,

-      (char *)xdata, rpng2_info.width, rpng2_info.height, pad, 0);

-

-    if (!ximage) {

-        fprintf(stderr, PROGNAME ":  XCreateImage() failed\n");

-        free(xdata);

-        return 3;

-    }

-

-    /* to avoid testing the byte order every pixel (or doubling the size of

-     * the drawing routine with a giant if-test), we arbitrarily set the byte

-     * order to MSBFirst and let Xlib worry about inverting things on little-

-     * endian machines (e.g., Linux/x86, old VAXen, etc.)--this is not the

-     * most efficient approach (the giant if-test would be better), but in

-     * the interest of clarity, we'll take the easy way out... */

-

-    ximage->byte_order = MSBFirst;

-

-/*---------------------------------------------------------------------------

-    Fill window with the specified background color (default is black) or

-    faked "background image" (but latter is disabled if 8-bit; gradients

-    just waste palette entries).

-  ---------------------------------------------------------------------------*/

-

-    if (bg_image)

-        rpng2_x_load_bg_image();    /* resets bg_image if fails */

-

-    if (!bg_image) {

-        if (depth == 24 || depth == 32) {

-            bg_pixel = (bg_red   << RShift) |

-                       (bg_green << GShift) |

-                       (bg_blue  << BShift);

-        } else if (depth == 16) {

-            bg_pixel = (((bg_red   << 8) >> RShift) & RMask) |

-                       (((bg_green << 8) >> GShift) & GMask) |

-                       (((bg_blue  << 8) >> BShift) & BMask);

-        } else /* depth == 8 */ {

-

-            /* GRR:  add 8-bit support */

-

-        }

-        XSetForeground(display, gc, bg_pixel);

-        XFillRectangle(display, window, gc, 0, 0, rpng2_info.width,

-          rpng2_info.height);

-    }

-

-/*---------------------------------------------------------------------------

-    Wait for first Expose event to do any drawing, then flush and return.

-  ---------------------------------------------------------------------------*/

-

-    do

-        XNextEvent(display, &e);

-    while (e.type != Expose || e.xexpose.count);

-

-    XFlush(display);

-

-    return 0;

-

-} /* end function rpng2_x_create_window() */

-

-

-

-

-

-static int rpng2_x_load_bg_image(void)

-{

-    uch *src;

-    char *dest;

-    uch r1, r2, g1, g2, b1, b2;

-    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;

-    int k, hmax, max;

-    int xidx, yidx, yidx_max;

-    int even_odd_vert, even_odd_horiz, even_odd;

-    int invert_gradient2 = (bg[pat].type & 0x08);

-    int invert_column;

-    int ximage_rowbytes = ximage->bytes_per_line;

-    ulg i, row;

-    ulg pixel;

-

-/*---------------------------------------------------------------------------

-    Allocate buffer for fake background image to be used with transparent

-    images; if this fails, revert to plain background color.

-  ---------------------------------------------------------------------------*/

-

-    bg_rowbytes = 3 * rpng2_info.width;

-    bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);

-    if (!bg_data) {

-        fprintf(stderr, PROGNAME

-          ":  unable to allocate memory for background image\n");

-        bg_image = 0;

-        return 1;

-    }

-

-    bgscale = (pat == 0)? 8 : bgscale_default;

-    yidx_max = bgscale - 1;

-

-/*---------------------------------------------------------------------------

-    Vertical gradients (ramps) in NxN squares, alternating direction and

-    colors (N == bgscale).

-  ---------------------------------------------------------------------------*/

-

-    if ((bg[pat].type & 0x07) == 0) {

-        uch r1_min  = rgb[bg[pat].rgb1_min].r;

-        uch g1_min  = rgb[bg[pat].rgb1_min].g;

-        uch b1_min  = rgb[bg[pat].rgb1_min].b;

-        uch r2_min  = rgb[bg[pat].rgb2_min].r;

-        uch g2_min  = rgb[bg[pat].rgb2_min].g;

-        uch b2_min  = rgb[bg[pat].rgb2_min].b;

-        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;

-        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;

-        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;

-        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;

-        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;

-        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = (int)(row % bgscale);

-            even_odd_vert = (int)((row / bgscale) & 1);

-

-            r1 = r1_min + (r1_diff * yidx) / yidx_max;

-            g1 = g1_min + (g1_diff * yidx) / yidx_max;

-            b1 = b1_min + (b1_diff * yidx) / yidx_max;

-            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;

-            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;

-            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;

-

-            r2 = r2_min + (r2_diff * yidx) / yidx_max;

-            g2 = g2_min + (g2_diff * yidx) / yidx_max;

-            b2 = b2_min + (b2_diff * yidx) / yidx_max;

-            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;

-            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;

-            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;

-

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                even_odd_horiz = (int)((i / bgscale) & 1);

-                even_odd = even_odd_vert ^ even_odd_horiz;

-                invert_column =

-                  (even_odd_horiz && (bg[pat].type & 0x10));

-                if (even_odd == 0) {        /* gradient #1 */

-                    if (invert_column) {

-                        *dest++ = r1_inv;

-                        *dest++ = g1_inv;

-                        *dest++ = b1_inv;

-                    } else {

-                        *dest++ = r1;

-                        *dest++ = g1;

-                        *dest++ = b1;

-                    }

-                } else {                    /* gradient #2 */

-                    if ((invert_column && invert_gradient2) ||

-                        (!invert_column && !invert_gradient2))

-                    {

-                        *dest++ = r2;       /* not inverted or */

-                        *dest++ = g2;       /*  doubly inverted */

-                        *dest++ = b2;

-                    } else {

-                        *dest++ = r2_inv;

-                        *dest++ = g2_inv;   /* singly inverted */

-                        *dest++ = b2_inv;

-                    }

-                }

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam

-    M. Costello.

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 1) {

-

-        hmax = (bgscale-1)/2;   /* half the max weight of a color */

-        max = 2*hmax;           /* the max weight of a color */

-

-        r1 = rgb[bg[pat].rgb1_max].r;

-        g1 = rgb[bg[pat].rgb1_max].g;

-        b1 = rgb[bg[pat].rgb1_max].b;

-        r2 = rgb[bg[pat].rgb2_max].r;

-        g2 = rgb[bg[pat].rgb2_max].g;

-        b2 = rgb[bg[pat].rgb2_max].b;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = (int)(row % bgscale);

-            if (yidx > hmax)

-                yidx = bgscale-1 - yidx;

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                xidx = (int)(i % bgscale);

-                if (xidx > hmax)

-                    xidx = bgscale-1 - xidx;

-                k = xidx + yidx;

-                *dest++ = (k*r1 + (max-k)*r2) / max;

-                *dest++ = (k*g1 + (max-k)*g2) / max;

-                *dest++ = (k*b1 + (max-k)*b2) / max;

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-

-    soids will equal bgscale?].  This one is slow but very cool.  Code con-

-    tributed by Pieter S. van der Meulen (originally in Smalltalk).

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 2) {

-        uch ch;

-        int ii, x, y, hw, hh, grayspot;

-        double freq, rotate, saturate, gray, intensity;

-        double angle=0.0, aoffset=0.0, maxDist, dist;

-        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;

-

-        fprintf(stderr, "%s:  computing radial background...",

-          PROGNAME);

-        fflush(stderr);

-

-        hh = (int)(rpng2_info.height / 2);

-        hw = (int)(rpng2_info.width / 2);

-

-        /* variables for radial waves:

-         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]

-         *   freq:  number of color beams originating from the center

-         *   grayspot:  size of the graying center area (anti-alias)

-         *   rotate:  rotation of the beams as a function of radius

-         *   saturate:  saturation of beams' shape azimuthally

-         */

-        angle = CLIP(angle, 0.0, 360.0);

-        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));

-        freq = MAX((double)bg[pat].bg_freq, 0.0);

-        saturate = (double)bg[pat].bg_bsat * 0.1;

-        rotate = (double)bg[pat].bg_brot * 0.1;

-        gray = 0.0;

-        intensity = 0.0;

-        maxDist = (double)((hw*hw) + (hh*hh));

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            y = (int)(row - hh);

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                x = (int)(i - hw);

-                angle = (x == 0)? PI_2 : atan((double)y / (double)x);

-                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;

-                gray = MIN(1.0, gray);

-                dist = (double)((x*x) + (y*y)) / maxDist;

-                intensity = cos((angle+(rotate*dist*PI)) * freq) *

-                  gray * saturate;

-                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;

-                hue = (angle + PI) * INV_PI_360 + aoffset;

-                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));

-                s = MIN(MAX(s,0.0), 1.0);

-                v = MIN(MAX(intensity,0.0), 1.0);

-

-                if (s == 0.0) {

-                    ch = (uch)(v * 255.0);

-                    *dest++ = ch;

-                    *dest++ = ch;

-                    *dest++ = ch;

-                } else {

-                    if ((hue < 0.0) || (hue >= 360.0))

-                        hue -= (((int)(hue / 360.0)) * 360.0);

-                    hue /= 60.0;

-                    ii = (int)hue;

-                    f = hue - (double)ii;

-                    p = (1.0 - s) * v;

-                    q = (1.0 - (s * f)) * v;

-                    t = (1.0 - (s * (1.0 - f))) * v;

-                    if      (ii == 0) { red = v; green = t; blue = p; }

-                    else if (ii == 1) { red = q; green = v; blue = p; }

-                    else if (ii == 2) { red = p; green = v; blue = t; }

-                    else if (ii == 3) { red = p; green = q; blue = v; }

-                    else if (ii == 4) { red = t; green = p; blue = v; }

-                    else if (ii == 5) { red = v; green = p; blue = q; }

-                    *dest++ = (uch)(red * 255.0);

-                    *dest++ = (uch)(green * 255.0);

-                    *dest++ = (uch)(blue * 255.0);

-                }

-            }

-        }

-        fprintf(stderr, "done.\n");

-        fflush(stderr);

-    }

-

-/*---------------------------------------------------------------------------

-    Blast background image to display buffer before beginning PNG decode.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        ulg red, green, blue;

-        int bpp = ximage->bits_per_pixel;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            src = bg_data + row*bg_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            if (bpp == 32) {    /* slightly optimized version */

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    red   = *src++;

-                    green = *src++;

-                    blue  = *src++;

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            } else {

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    red   = *src++;

-                    green = *src++;

-                    blue  = *src++;

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */

-                    /*           (probably need to use RShift, RMask, etc.) */

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-        }

-

-    } else if (depth == 16) {

-        ush red, green, blue;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            src = bg_data + row*bg_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                red   = ((ush)(*src) << 8);  ++src;

-                green = ((ush)(*src) << 8);  ++src;

-                blue  = ((ush)(*src) << 8);  ++src;

-                pixel = ((red   >> RShift) & RMask) |

-                        ((green >> GShift) & GMask) |

-                        ((blue  >> BShift) & BMask);

-                /* recall that we set ximage->byte_order = MSBFirst above */

-                *dest++ = (char)((pixel >>  8) & 0xff);

-                *dest++ = (char)( pixel        & 0xff);

-            }

-        }

-

-    } else /* depth == 8 */ {

-

-        /* GRR:  add 8-bit support */

-

-    }

-

-    XPutImage(display, window, gc, ximage, 0, 0, 0, 0, rpng2_info.width,

-      rpng2_info.height);

-

-    return 0;

-

-} /* end function rpng2_x_load_bg_image() */

-

-

-

-

-

-static void rpng2_x_display_row(ulg row)

-{

-    uch bg_red   = rpng2_info.bg_red;

-    uch bg_green = rpng2_info.bg_green;

-    uch bg_blue  = rpng2_info.bg_blue;

-    uch *src, *src2=NULL;

-    char *dest;

-    uch r, g, b, a;

-    int ximage_rowbytes = ximage->bytes_per_line;

-    ulg i, pixel;

-    static int rows=0, prevpass=(-1);

-    static ulg firstrow;

-

-/*---------------------------------------------------------------------------

-    rows and firstrow simply track how many rows (and which ones) have not

-    yet been displayed; alternatively, we could call XPutImage() for every

-    row and not bother with the records-keeping.

-  ---------------------------------------------------------------------------*/

-

-    Trace((stderr, "beginning rpng2_x_display_row()\n"))

-

-    if (rpng2_info.pass != prevpass) {

-        if (pause_after_pass && rpng2_info.pass > 0) {

-            XEvent e;

-            KeySym k;

-

-            fprintf(stderr,

-              "%s:  end of pass %d of 7; click in image window to continue\n",

-              PROGNAME, prevpass + 1);

-            do

-                XNextEvent(display, &e);

-            while (!QUIT(e,k));

-        }

-        fprintf(stderr, "%s:  pass %d of 7\r", PROGNAME, rpng2_info.pass + 1);

-        fflush(stderr);

-        prevpass = rpng2_info.pass;

-    }

-

-    if (rows == 0)

-        firstrow = row;   /* first row that is not yet displayed */

-

-    ++rows;   /* count of rows received but not yet displayed */

-

-/*---------------------------------------------------------------------------

-    Aside from the use of the rpng2_info struct, the lack of an outer loop

-    (over rows) and moving the XPutImage() call outside the "if (depth)"

-    tests, this routine is identical to rpng_x_display_image() in the non-

-    progressive version of the program.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        ulg red, green, blue;

-        int bpp = ximage->bits_per_pixel;

-

-        src = rpng2_info.image_data + row*rpng2_info.rowbytes;

-        if (bg_image)

-            src2 = bg_data + row*bg_rowbytes;

-        dest = ximage->data + row*ximage_rowbytes;

-        if (rpng2_info.channels == 3) {

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                red   = *src++;

-                green = *src++;

-                blue  = *src++;

-                pixel = (red   << RShift) |

-                        (green << GShift) |

-                        (blue  << BShift);

-                /* recall that we set ximage->byte_order = MSBFirst above */

-                if (bpp == 32) {

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                } else {

-                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */

-                    /*           (probably need to use RShift, RMask, etc.) */

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-        } else /* if (rpng2_info.channels == 4) */ {

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                r = *src++;

-                g = *src++;

-                b = *src++;

-                a = *src++;

-                if (bg_image) {

-                    bg_red   = *src2++;

-                    bg_green = *src2++;

-                    bg_blue  = *src2++;

-                }

-                if (a == 255) {

-                    red   = r;

-                    green = g;

-                    blue  = b;

-                } else if (a == 0) {

-                    red   = bg_red;

-                    green = bg_green;

-                    blue  = bg_blue;

-                } else {

-                    /* this macro (from png.h) composites the foreground

-                     * and background values and puts the result into the

-                     * first argument */

-                    alpha_composite(red,   r, a, bg_red);

-                    alpha_composite(green, g, a, bg_green);

-                    alpha_composite(blue,  b, a, bg_blue);

-                }

-                pixel = (red   << RShift) |

-                        (green << GShift) |

-                        (blue  << BShift);

-                /* recall that we set ximage->byte_order = MSBFirst above */

-                if (bpp == 32) {

-                    *dest++ = (char)((pixel >> 24) & 0xff);

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                } else {

-                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */

-                    /*           (probably need to use RShift, RMask, etc.) */

-                    *dest++ = (char)((pixel >> 16) & 0xff);

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-        }

-

-    } else if (depth == 16) {

-        ush red, green, blue;

-

-        src = rpng2_info.row_pointers[row];

-        if (bg_image)

-            src2 = bg_data + row*bg_rowbytes;

-        dest = ximage->data + row*ximage_rowbytes;

-        if (rpng2_info.channels == 3) {

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                red   = ((ush)(*src) << 8);

-                ++src;

-                green = ((ush)(*src) << 8);

-                ++src;

-                blue  = ((ush)(*src) << 8);

-                ++src;

-                pixel = ((red   >> RShift) & RMask) |

-                        ((green >> GShift) & GMask) |

-                        ((blue  >> BShift) & BMask);

-                /* recall that we set ximage->byte_order = MSBFirst above */

-                *dest++ = (char)((pixel >>  8) & 0xff);

-                *dest++ = (char)( pixel        & 0xff);

-            }

-        } else /* if (rpng2_info.channels == 4) */ {

-            for (i = rpng2_info.width;  i > 0;  --i) {

-                r = *src++;

-                g = *src++;

-                b = *src++;

-                a = *src++;

-                if (bg_image) {

-                    bg_red   = *src2++;

-                    bg_green = *src2++;

-                    bg_blue  = *src2++;

-                }

-                if (a == 255) {

-                    red   = ((ush)r << 8);

-                    green = ((ush)g << 8);

-                    blue  = ((ush)b << 8);

-                } else if (a == 0) {

-                    red   = ((ush)bg_red   << 8);

-                    green = ((ush)bg_green << 8);

-                    blue  = ((ush)bg_blue  << 8);

-                } else {

-                    /* this macro (from png.h) composites the foreground

-                     * and background values and puts the result back into

-                     * the first argument (== fg byte here:  safe) */

-                    alpha_composite(r, r, a, bg_red);

-                    alpha_composite(g, g, a, bg_green);

-                    alpha_composite(b, b, a, bg_blue);

-                    red   = ((ush)r << 8);

-                    green = ((ush)g << 8);

-                    blue  = ((ush)b << 8);

-                }

-                pixel = ((red   >> RShift) & RMask) |

-                        ((green >> GShift) & GMask) |

-                        ((blue  >> BShift) & BMask);

-                /* recall that we set ximage->byte_order = MSBFirst above */

-                *dest++ = (char)((pixel >>  8) & 0xff);

-                *dest++ = (char)( pixel        & 0xff);

-            }

-        }

-

-    } else /* depth == 8 */ {

-

-        /* GRR:  add 8-bit support */

-

-    }

-

-

-/*---------------------------------------------------------------------------

-    Display after every 16 rows or when on one of last two rows.  (Region

-    may include previously displayed lines due to interlacing--i.e., not

-    contiguous.  Also, second-to-last row is final one in interlaced images

-    with odd number of rows.)  For demos, flush (and delay) after every 16th

-    row so "sparse" passes don't go twice as fast.

-  ---------------------------------------------------------------------------*/

-

-    if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) {

-        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,

-          (int)firstrow, rpng2_info.width, row - firstrow + 1);

-        XFlush(display);

-        rows = 0;

-        usleep(usleep_duration);

-    } else

-    if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) {

-        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,

-          (int)firstrow, rpng2_info.width, row - firstrow + 1);

-        XFlush(display);

-        rows = 0;

-    }

-

-}

-

-

-

-

-

-static void rpng2_x_finish_display(void)

-{

-    Trace((stderr, "beginning rpng2_x_finish_display()\n"))

-

-    /* last row has already been displayed by rpng2_x_display_row(), so we

-     * have nothing to do here except set a flag and let the user know that

-     * the image is done */

-

-    rpng2_info.state = kDone;

-    printf(

-      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");

-    fflush(stdout);

-}

-

-

-

-

-

-static void rpng2_x_redisplay_image(ulg startcol, ulg startrow,

-                                    ulg width, ulg height)

-{

-    uch bg_red   = rpng2_info.bg_red;

-    uch bg_green = rpng2_info.bg_green;

-    uch bg_blue  = rpng2_info.bg_blue;

-    uch *src, *src2=NULL;

-    char *dest;

-    uch r, g, b, a;

-    ulg i, row, lastrow = 0;

-    ulg pixel;

-    int ximage_rowbytes = ximage->bytes_per_line;

-

-

-    Trace((stderr, "beginning display loop (image_channels == %d)\n",

-      rpng2_info.channels))

-    Trace((stderr, "   (width = %ld, rowbytes = %d, ximage_rowbytes = %d)\n",

-      rpng2_info.width, rpng2_info.rowbytes, ximage_rowbytes))

-    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))

-    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?

-      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))

-

-/*---------------------------------------------------------------------------

-    Aside from the use of the rpng2_info struct and of src2 (for background

-    image), this routine is identical to rpng_x_display_image() in the non-

-    progressive version of the program--for the simple reason that redisplay

-    of the image against a new background happens after the image is fully

-    decoded and therefore is, by definition, non-progressive.

-  ---------------------------------------------------------------------------*/

-

-    if (depth == 24 || depth == 32) {

-        ulg red, green, blue;

-        int bpp = ximage->bits_per_pixel;

-

-        for (lastrow = row = startrow;  row < startrow+height;  ++row) {

-            src = rpng2_info.image_data + row*rpng2_info.rowbytes;

-            if (bg_image)

-                src2 = bg_data + row*bg_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            if (rpng2_info.channels == 3) {

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    red   = *src++;

-                    green = *src++;

-                    blue  = *src++;

-#ifdef NO_24BIT_MASKS

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    if (bpp == 32) {

-                        *dest++ = (char)((pixel >> 24) & 0xff);

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    } else {

-                        /* this assumes bpp == 24 & bits are packed low */

-                        /* (probably need to use RShift, RMask, etc.) */

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    }

-#else

-                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;

-                    green = (GShift < 0)? green << (-GShift) : green >> GShift;

-                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;

-                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    if (bpp == 32) {

-                        *dest++ = (char)((pixel >> 24) & 0xff);

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    } else {

-                        /* GRR BUG */

-                        /* this assumes bpp == 24 & bits are packed low */

-                        /* (probably need to use RShift/RMask/etc. here, too) */

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    }

-#endif

-                }

-

-            } else /* if (rpng2_info.channels == 4) */ {

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    r = *src++;

-                    g = *src++;

-                    b = *src++;

-                    a = *src++;

-                    if (bg_image) {

-                        bg_red   = *src2++;

-                        bg_green = *src2++;

-                        bg_blue  = *src2++;

-                    }

-                    if (a == 255) {

-                        red   = r;

-                        green = g;

-                        blue  = b;

-                    } else if (a == 0) {

-                        red   = bg_red;

-                        green = bg_green;

-                        blue  = bg_blue;

-                    } else {

-                        /* this macro (from png.h) composites the foreground

-                         * and background values and puts the result into the

-                         * first argument */

-                        alpha_composite(red,   r, a, bg_red);

-                        alpha_composite(green, g, a, bg_green);

-                        alpha_composite(blue,  b, a, bg_blue);

-                    }

-#ifdef NO_24BIT_MASKS

-                    pixel = (red   << RShift) |

-                            (green << GShift) |

-                            (blue  << BShift);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    if (bpp == 32) {

-                        *dest++ = (char)((pixel >> 24) & 0xff);

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    } else {

-                        /* this assumes bpp == 24 & bits are packed low */

-                        /* (probably need to use RShift, RMask, etc.) */

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    }

-#else

-                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;

-                    green = (GShift < 0)? green << (-GShift) : green >> GShift;

-                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;

-                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    if (bpp == 32) {

-                        *dest++ = (char)((pixel >> 24) & 0xff);

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    } else {

-                        /* GRR BUG */

-                        /* this assumes bpp == 24 & bits are packed low */

-                        /* (probably need to use RShift/RMask/etc. here, too) */

-                        *dest++ = (char)((pixel >> 16) & 0xff);

-                        *dest++ = (char)((pixel >>  8) & 0xff);

-                        *dest++ = (char)( pixel        & 0xff);

-                    }

-#endif

-                }

-            }

-            /* display after every 16 lines */

-            if (((row+1) & 0xf) == 0) {

-                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-                  (int)lastrow, rpng2_info.width, 16);

-                XFlush(display);

-                lastrow = row + 1;

-            }

-        }

-

-    } else if (depth == 16) {

-        ush red, green, blue;

-

-        for (lastrow = row = startrow;  row < startrow+height;  ++row) {

-            src = rpng2_info.row_pointers[row];

-            if (bg_image)

-                src2 = bg_data + row*bg_rowbytes;

-            dest = ximage->data + row*ximage_rowbytes;

-            if (rpng2_info.channels == 3) {

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    red   = ((ush)(*src) << 8);

-                    ++src;

-                    green = ((ush)(*src) << 8);

-                    ++src;

-                    blue  = ((ush)(*src) << 8);

-                    ++src;

-                    pixel = ((red   >> RShift) & RMask) |

-                            ((green >> GShift) & GMask) |

-                            ((blue  >> BShift) & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            } else /* if (rpng2_info.channels == 4) */ {

-                for (i = rpng2_info.width;  i > 0;  --i) {

-                    r = *src++;

-                    g = *src++;

-                    b = *src++;

-                    a = *src++;

-                    if (bg_image) {

-                        bg_red   = *src2++;

-                        bg_green = *src2++;

-                        bg_blue  = *src2++;

-                    }

-                    if (a == 255) {

-                        red   = ((ush)r << 8);

-                        green = ((ush)g << 8);

-                        blue  = ((ush)b << 8);

-                    } else if (a == 0) {

-                        red   = ((ush)bg_red   << 8);

-                        green = ((ush)bg_green << 8);

-                        blue  = ((ush)bg_blue  << 8);

-                    } else {

-                        /* this macro (from png.h) composites the foreground

-                         * and background values and puts the result back into

-                         * the first argument (== fg byte here:  safe) */

-                        alpha_composite(r, r, a, bg_red);

-                        alpha_composite(g, g, a, bg_green);

-                        alpha_composite(b, b, a, bg_blue);

-                        red   = ((ush)r << 8);

-                        green = ((ush)g << 8);

-                        blue  = ((ush)b << 8);

-                    }

-                    pixel = ((red   >> RShift) & RMask) |

-                            ((green >> GShift) & GMask) |

-                            ((blue  >> BShift) & BMask);

-                    /* recall that we set ximage->byte_order = MSBFirst above */

-                    *dest++ = (char)((pixel >>  8) & 0xff);

-                    *dest++ = (char)( pixel        & 0xff);

-                }

-            }

-            /* display after every 16 lines */

-            if (((row+1) & 0xf) == 0) {

-                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-                  (int)lastrow, rpng2_info.width, 16);

-                XFlush(display);

-                lastrow = row + 1;

-            }

-        }

-

-    } else /* depth == 8 */ {

-

-        /* GRR:  add 8-bit support */

-

-    }

-

-    Trace((stderr, "calling final XPutImage()\n"))

-    if (lastrow < startrow+height) {

-        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,

-          (int)lastrow, rpng2_info.width, rpng2_info.height-lastrow);

-        XFlush(display);

-    }

-

-} /* end function rpng2_x_redisplay_image() */

-

-

-

-

-

-#ifdef FEATURE_LOOP

-

-static void rpng2_x_reload_bg_image(void)

-{

-    char *dest;

-    uch r1, r2, g1, g2, b1, b2;

-    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;

-    int k, hmax, max;

-    int xidx, yidx, yidx_max;

-    int even_odd_vert, even_odd_horiz, even_odd;

-    int invert_gradient2 = (bg[pat].type & 0x08);

-    int invert_column;

-    ulg i, row;

-

-

-    bgscale = (pat == 0)? 8 : bgscale_default;

-    yidx_max = bgscale - 1;

-

-/*---------------------------------------------------------------------------

-    Vertical gradients (ramps) in NxN squares, alternating direction and

-    colors (N == bgscale).

-  ---------------------------------------------------------------------------*/

-

-    if ((bg[pat].type & 0x07) == 0) {

-        uch r1_min  = rgb[bg[pat].rgb1_min].r;

-        uch g1_min  = rgb[bg[pat].rgb1_min].g;

-        uch b1_min  = rgb[bg[pat].rgb1_min].b;

-        uch r2_min  = rgb[bg[pat].rgb2_min].r;

-        uch g2_min  = rgb[bg[pat].rgb2_min].g;

-        uch b2_min  = rgb[bg[pat].rgb2_min].b;

-        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;

-        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;

-        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;

-        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;

-        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;

-        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = (int)(row % bgscale);

-            even_odd_vert = (int)((row / bgscale) & 1);

-

-            r1 = r1_min + (r1_diff * yidx) / yidx_max;

-            g1 = g1_min + (g1_diff * yidx) / yidx_max;

-            b1 = b1_min + (b1_diff * yidx) / yidx_max;

-            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;

-            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;

-            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;

-

-            r2 = r2_min + (r2_diff * yidx) / yidx_max;

-            g2 = g2_min + (g2_diff * yidx) / yidx_max;

-            b2 = b2_min + (b2_diff * yidx) / yidx_max;

-            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;

-            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;

-            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;

-

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                even_odd_horiz = (int)((i / bgscale) & 1);

-                even_odd = even_odd_vert ^ even_odd_horiz;

-                invert_column =

-                  (even_odd_horiz && (bg[pat].type & 0x10));

-                if (even_odd == 0) {        /* gradient #1 */

-                    if (invert_column) {

-                        *dest++ = r1_inv;

-                        *dest++ = g1_inv;

-                        *dest++ = b1_inv;

-                    } else {

-                        *dest++ = r1;

-                        *dest++ = g1;

-                        *dest++ = b1;

-                    }

-                } else {                    /* gradient #2 */

-                    if ((invert_column && invert_gradient2) ||

-                        (!invert_column && !invert_gradient2))

-                    {

-                        *dest++ = r2;       /* not inverted or */

-                        *dest++ = g2;       /*  doubly inverted */

-                        *dest++ = b2;

-                    } else {

-                        *dest++ = r2_inv;

-                        *dest++ = g2_inv;   /* singly inverted */

-                        *dest++ = b2_inv;

-                    }

-                }

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam

-    M. Costello.

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 1) {

-

-        hmax = (bgscale-1)/2;   /* half the max weight of a color */

-        max = 2*hmax;           /* the max weight of a color */

-

-        r1 = rgb[bg[pat].rgb1_max].r;

-        g1 = rgb[bg[pat].rgb1_max].g;

-        b1 = rgb[bg[pat].rgb1_max].b;

-        r2 = rgb[bg[pat].rgb2_max].r;

-        g2 = rgb[bg[pat].rgb2_max].g;

-        b2 = rgb[bg[pat].rgb2_max].b;

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            yidx = (int)(row % bgscale);

-            if (yidx > hmax)

-                yidx = bgscale-1 - yidx;

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                xidx = (int)(i % bgscale);

-                if (xidx > hmax)

-                    xidx = bgscale-1 - xidx;

-                k = xidx + yidx;

-                *dest++ = (k*r1 + (max-k)*r2) / max;

-                *dest++ = (k*g1 + (max-k)*g2) / max;

-                *dest++ = (k*b1 + (max-k)*b2) / max;

-            }

-        }

-

-/*---------------------------------------------------------------------------

-    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-

-    soids will equal bgscale?].  This one is slow but very cool.  Code con-

-    tributed by Pieter S. van der Meulen (originally in Smalltalk).

-  ---------------------------------------------------------------------------*/

-

-    } else if ((bg[pat].type & 0x07) == 2) {

-        uch ch;

-        int ii, x, y, hw, hh, grayspot;

-        double freq, rotate, saturate, gray, intensity;

-        double angle=0.0, aoffset=0.0, maxDist, dist;

-        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;

-

-        hh = (int)(rpng2_info.height / 2);

-        hw = (int)(rpng2_info.width / 2);

-

-        /* variables for radial waves:

-         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]

-         *   freq:  number of color beams originating from the center

-         *   grayspot:  size of the graying center area (anti-alias)

-         *   rotate:  rotation of the beams as a function of radius

-         *   saturate:  saturation of beams' shape azimuthally

-         */

-        angle = CLIP(angle, 0.0, 360.0);

-        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));

-        freq = MAX((double)bg[pat].bg_freq, 0.0);

-        saturate = (double)bg[pat].bg_bsat * 0.1;

-        rotate = (double)bg[pat].bg_brot * 0.1;

-        gray = 0.0;

-        intensity = 0.0;

-        maxDist = (double)((hw*hw) + (hh*hh));

-

-        for (row = 0;  row < rpng2_info.height;  ++row) {

-            y = (int)(row - hh);

-            dest = (char *)bg_data + row*bg_rowbytes;

-            for (i = 0;  i < rpng2_info.width;  ++i) {

-                x = (int)(i - hw);

-                angle = (x == 0)? PI_2 : atan((double)y / (double)x);

-                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;

-                gray = MIN(1.0, gray);

-                dist = (double)((x*x) + (y*y)) / maxDist;

-                intensity = cos((angle+(rotate*dist*PI)) * freq) *

-                  gray * saturate;

-                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;

-                hue = (angle + PI) * INV_PI_360 + aoffset;

-                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));

-                s = MIN(MAX(s,0.0), 1.0);

-                v = MIN(MAX(intensity,0.0), 1.0);

-

-                if (s == 0.0) {

-                    ch = (uch)(v * 255.0);

-                    *dest++ = ch;

-                    *dest++ = ch;

-                    *dest++ = ch;

-                } else {

-                    if ((hue < 0.0) || (hue >= 360.0))

-                        hue -= (((int)(hue / 360.0)) * 360.0);

-                    hue /= 60.0;

-                    ii = (int)hue;

-                    f = hue - (double)ii;

-                    p = (1.0 - s) * v;

-                    q = (1.0 - (s * f)) * v;

-                    t = (1.0 - (s * (1.0 - f))) * v;

-                    if      (ii == 0) { red = v; green = t; blue = p; }

-                    else if (ii == 1) { red = q; green = v; blue = p; }

-                    else if (ii == 2) { red = p; green = v; blue = t; }

-                    else if (ii == 3) { red = p; green = q; blue = v; }

-                    else if (ii == 4) { red = t; green = p; blue = v; }

-                    else if (ii == 5) { red = v; green = p; blue = q; }

-                    *dest++ = (uch)(red * 255.0);

-                    *dest++ = (uch)(green * 255.0);

-                    *dest++ = (uch)(blue * 255.0);

-                }

-            }

-        }

-    }

-

-} /* end function rpng2_x_reload_bg_image() */

-

-

-

-

-

-static int is_number(char *p)

-{

-    while (*p) {

-        if (!isdigit(*p))

-            return FALSE;

-        ++p;

-    }

-    return TRUE;

-}

-

-#endif /* FEATURE_LOOP */

-

-

-

-

-

-static void rpng2_x_cleanup(void)

-{

-    if (bg_image && bg_data) {

-        free(bg_data);

-        bg_data = NULL;

-    }

-

-    if (rpng2_info.image_data) {

-        free(rpng2_info.image_data);

-        rpng2_info.image_data = NULL;

-    }

-

-    if (rpng2_info.row_pointers) {

-        free(rpng2_info.row_pointers);

-        rpng2_info.row_pointers = NULL;

-    }

-

-    if (ximage) {

-        if (ximage->data) {

-            free(ximage->data);           /* we allocated it, so we free it */

-            ximage->data = (char *)NULL;  /*  instead of XDestroyImage() */

-        }

-        XDestroyImage(ximage);

-        ximage = NULL;

-    }

-

-    if (have_gc)

-        XFreeGC(display, gc);

-

-    if (have_window)

-        XDestroyWindow(display, window);

-

-    if (have_colormap)

-        XFreeColormap(display, colormap);

-

-    if (have_nondefault_visual)

-        XFree(visual_list);

-}

-

-

-

-

-

-static int rpng2_x_msb(ulg u32val)

-{

-    int i;

-

-    for (i = 31;  i >= 0;  --i) {

-        if (u32val & 0x80000000L)

-            break;

-        u32val <<= 1;

-    }

-    return i;

-}

+/*---------------------------------------------------------------------------
+
+   rpng2 - progressive-model PNG display program                  rpng2-x.c
+
+   This program decodes and displays PNG files progressively, as if it were
+   a web browser (though the front end is only set up to read from files).
+   It supports gamma correction, user-specified background colors, and user-
+   specified background patterns (for transparent images).  This version is
+   for the X Window System (tested by the author under Unix and by Martin
+   Zinser under OpenVMS; may work under OS/2 with a little tweaking).
+
+   Thanks to Adam Costello and Pieter S. van der Meulen for the "diamond"
+   and "radial waves" patterns, respectively.
+
+   to do (someday, maybe):
+    - fix expose/redraw code:  don't draw entire row if only part exposed
+    - 8-bit (colormapped) X support
+    - finish resizable checkerboard-gradient (sizes 4-128?)
+    - use %.1023s to simplify truncation of title-bar string?
+
+  ---------------------------------------------------------------------------
+
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options; fixed char/uchar mismatch
+    - 1.10:  added support for non-default visuals; fixed X pixel-conversion
+    - 1.11:  added -usleep option for demos; fixed command-line parsing bug
+    - 1.12:  added -pause option for demos and testing
+    - 1.20:  added runtime MMX-enabling/disabling and new -mmx* options
+    - 1.21:  fixed some small X memory leaks (thanks to François Petitjean)
+    - 1.22:  fixed XFreeGC() crash bug (thanks to Patrick Welche)
+    - 1.23:  added -bgpat 0 mode (std white/gray checkerboard, 8x8 squares)
+    - 1.30:  added -loop option for -bgpat (ifdef FEATURE_LOOP); fixed bpp =
+              24; added support for X resources (thanks to Gerhard Niklasch)
+    - 1.31:  added code to skip unused chunks (thanks to Glenn Randers-Pehrson)
+    - 1.32:  added AMD64/EM64T support (__x86_64__); added basic expose/redraw
+              handling
+    - 2.00:  dual-licensed (added GNU GPL)
+    - 2.01:  fixed 64-bit typo in readpng2.c; fixed -pause usage description
+    - 2.02:  fixed improper display of usage screen on PNG error(s); fixed
+              unexpected-EOF and file-read-error cases; fixed Trace() cut-and-
+              paste bugs
+    - 2.03:  deleted runtime MMX-enabling/disabling and obsolete -mmx* options
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2008 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#define PROGNAME  "rpng2-x"
+#define LONGNAME  "Progressive PNG Viewer for X"
+#define VERSION   "2.03 of 25 February 2010"
+#define RESNAME   "rpng2"       /* our X resource application name */
+#define RESCLASS  "Rpng"       /* our X resource class name */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <setjmp.h>       /* for jmpbuf declaration in readpng2.h */
+#include <time.h>
+#include <math.h>         /* only for PvdM background code */
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xos.h>
+#include <X11/keysym.h>   /* defines XK_* macros */
+
+#ifdef VMS
+#  include <unistd.h>
+#endif
+
+/* all for PvdM background code: */
+#ifndef PI
+#  define PI             3.141592653589793238
+#endif
+#define PI_2             (PI*0.5)
+#define INV_PI_360       (360.0 / PI)
+#define MAX(a,b)         (a>b?a:b)
+#define MIN(a,b)         (a<b?a:b)
+#define CLIP(a,min,max)  MAX(min,MIN((a),max))
+#define ABS(a)           ((a)<0?-(a):(a))
+#define CLIP8P(c)        MAX(0,(MIN((c),255)))   /* 8-bit pos. integer (uch) */
+#define ROUNDF(f)        ((int)(f + 0.5))
+
+#define QUIT(e,k) ((e.type == ButtonPress && e.xbutton.button == Button1) ||  \
+                  (e.type == KeyPress &&   /*  v--- or 1 for shifted keys */  \
+                  ((k = XLookupKeysym(&e.xkey, 0)) == XK_q || k == XK_Escape)))
+
+#define NO_24BIT_MASKS /* undef case not fully written--only for redisplay() */
+
+#define rgb1_max   bg_freq
+#define rgb1_min   bg_gray
+#define rgb2_max   bg_bsat
+#define rgb2_min   bg_brot
+
+/* #define DEBUG */     /* this enables the Trace() macros */
+
+#include "readpng2.h"   /* typedefs, common macros, readpng2 prototypes */
+
+
+/* could just include png.h, but this macro is the only thing we need
+ * (name and typedefs changed to local versions); note that side effects
+ * only happen with alpha (which could easily be avoided with
+ * "ush acopy = (alpha);") */
+
+#define alpha_composite(composite, fg, alpha, bg) {               \
+    ush temp = ((ush)(fg)*(ush)(alpha) +                          \
+                (ush)(bg)*(ush)(255 - (ush)(alpha)) + (ush)128);  \
+    (composite) = (uch)((temp + (temp >> 8)) >> 8);               \
+}
+
+
+#define INBUFSIZE 4096   /* with pseudo-timing on (1 sec delay/block), this
+                          *  block size corresponds roughly to a download
+                          *  speed 10% faster than theoretical 33.6K maximum
+                          *  (assuming 8 data bits, 1 stop bit and no other
+                          *  overhead) */
+
+/* local prototypes */
+static void rpng2_x_init (void);
+static int  rpng2_x_create_window (void);
+static int  rpng2_x_load_bg_image (void);
+static void rpng2_x_display_row (ulg row);
+static void rpng2_x_finish_display (void);
+static void rpng2_x_redisplay_image (ulg startcol, ulg startrow,
+                                     ulg width, ulg height);
+#ifdef FEATURE_LOOP
+static void rpng2_x_reload_bg_image (void);
+static int  is_number (char *p);
+#endif
+static void rpng2_x_cleanup (void);
+static int  rpng2_x_msb (ulg u32val);
+
+
+static char titlebar[1024], *window_name = titlebar;
+static char *appname = LONGNAME;
+static char *icon_name = PROGNAME;
+static char *res_name = RESNAME;
+static char *res_class = RESCLASS;
+static char *filename;
+static FILE *infile;
+
+static mainprog_info rpng2_info;
+
+static uch inbuf[INBUFSIZE];
+static int incount;
+
+static int pat = 6;        /* must be less than num_bgpat */
+static int bg_image = 0;
+static int bgscale, bgscale_default = 16;
+static ulg bg_rowbytes;
+static uch *bg_data;
+
+int pause_after_pass = FALSE;
+int demo_timing = FALSE;
+ulg usleep_duration = 0L;
+
+static struct rgb_color {
+    uch r, g, b;
+} rgb[] = {
+    {  0,   0,   0},    /*  0:  black */
+    {255, 255, 255},    /*  1:  white */
+    {173, 132,  57},    /*  2:  tan */
+    { 64, 132,   0},    /*  3:  medium green */
+    {189, 117,   1},    /*  4:  gold */
+    {253, 249,   1},    /*  5:  yellow */
+    {  0,   0, 255},    /*  6:  blue */
+    {  0,   0, 120},    /*  7:  medium blue */
+    {255,   0, 255},    /*  8:  magenta */
+    { 64,   0,  64},    /*  9:  dark magenta */
+    {255,   0,   0},    /* 10:  red */
+    { 64,   0,   0},    /* 11:  dark red */
+    {255, 127,   0},    /* 12:  orange */
+    {192,  96,   0},    /* 13:  darker orange */
+    { 24,  60,   0},    /* 14:  dark green-yellow */
+    { 85, 125, 200},    /* 15:  ice blue */
+    {192, 192, 192}     /* 16:  Netscape/Mosaic gray */
+};
+/* not used for now, but should be for error-checking:
+static int num_rgb = sizeof(rgb) / sizeof(struct rgb_color);
+ */
+
+/*
+    This whole struct is a fairly cheesy way to keep the number of
+    command-line options to a minimum.  The radial-waves background
+    type is a particularly poor fit to the integer elements of the
+    struct...but a few macros and a little fixed-point math will do
+    wonders for ya.
+
+    type bits:
+       F E D C B A 9 8 7 6 5 4 3 2 1 0
+                             | | | | |
+                             | | +-+-+-- 0 = sharp-edged checkerboard
+                             | |         1 = soft diamonds
+                             | |         2 = radial waves
+                             | |       3-7 = undefined
+                             | +-- gradient #2 inverted?
+                             +-- alternating columns inverted?
+ */
+static struct background_pattern {
+    ush type;
+    int rgb1_max, rgb1_min;     /* or bg_freq, bg_gray */
+    int rgb2_max, rgb2_min;     /* or bg_bsat, bg_brot (both scaled by 10)*/
+} bg[] = {
+    {0,     1,1, 16,16},        /* checkered:  white vs. light gray (basic) */
+    {0+8,   2,0,  1,15},        /* checkered:  tan/black vs. white/ice blue */
+    {0+24,  2,0,  1,0},         /* checkered:  tan/black vs. white/black */
+    {0+8,   4,5,  0,2},         /* checkered:  gold/yellow vs. black/tan */
+    {0+8,   4,5,  0,6},         /* checkered:  gold/yellow vs. black/blue */
+    {0,     7,0,  8,9},         /* checkered:  deep blue/black vs. magenta */
+    {0+8,  13,0,  5,14},        /* checkered:  orange/black vs. yellow */
+    {0+8,  12,0, 10,11},        /* checkered:  orange/black vs. red */
+    {1,     7,0,  8,0},         /* diamonds:  deep blue/black vs. magenta */
+    {1,    12,0, 11,0},         /* diamonds:  orange vs. dark red */
+    {1,    10,0,  7,0},         /* diamonds:  red vs. medium blue */
+    {1,     4,0,  5,0},         /* diamonds:  gold vs. yellow */
+    {1,     3,0,  0,0},         /* diamonds:  medium green vs. black */
+    {2,    16, 100,  20,   0},  /* radial:  ~hard radial color-beams */
+    {2,    18, 100,  10,   2},  /* radial:  soft, curved radial color-beams */
+    {2,    16, 256, 100, 250},  /* radial:  very tight spiral */
+    {2, 10000, 256,  11,   0}   /* radial:  dipole-moire' (almost fractal) */
+};
+static int num_bgpat = sizeof(bg) / sizeof(struct background_pattern);
+
+
+/* X-specific variables */
+static char *displayname;
+static XImage *ximage;
+static Display *display;
+static int depth;
+static Visual *visual;
+static XVisualInfo *visual_list;
+static int RShift, GShift, BShift;
+static ulg RMask, GMask, BMask;
+static Window window;
+static GC gc;
+static Colormap colormap;
+
+static int have_nondefault_visual = FALSE;
+static int have_colormap = FALSE;
+static int have_window = FALSE;
+static int have_gc = FALSE;
+
+
+
+
+int main(int argc, char **argv)
+{
+#ifdef sgi
+    char tmpline[80];
+#endif
+    char *p, *bgstr = NULL;
+    int rc, alen, flen;
+    int error = 0;
+    int timing = FALSE;
+    int have_bg = FALSE;
+#ifdef FEATURE_LOOP
+    int loop = FALSE;
+    long loop_interval = -1;            /* seconds (100,000 max) */
+#endif
+    double LUT_exponent;                /* just the lookup table */
+    double CRT_exponent = 2.2;          /* just the monitor */
+    double default_display_exponent;    /* whole display system */
+    XEvent e;
+    KeySym k;
+
+
+    /* First initialize a few things, just to be sure--memset takes care of
+     * default background color (black), booleans (FALSE), pointers (NULL),
+     * etc. */
+
+    displayname = (char *)NULL;
+    filename = (char *)NULL;
+    memset(&rpng2_info, 0, sizeof(mainprog_info));
+
+
+    /* Set the default value for our display-system exponent, i.e., the
+     * product of the CRT exponent and the exponent corresponding to
+     * the frame-buffer's lookup table (LUT), if any.  This is not an
+     * exhaustive list of LUT values (e.g., OpenStep has a lot of weird
+     * ones), but it should cover 99% of the current possibilities. */
+
+#if defined(NeXT)
+    /* third-party utilities can modify the default LUT exponent */
+    LUT_exponent = 1.0 / 2.2;
+    /*
+    if (some_next_function_that_returns_gamma(&next_gamma))
+        LUT_exponent = 1.0 / next_gamma;
+     */
+#elif defined(sgi)
+    LUT_exponent = 1.0 / 1.7;
+    /* there doesn't seem to be any documented function to
+     * get the "gamma" value, so we do it the hard way */
+    infile = fopen("/etc/config/system.glGammaVal", "r");
+    if (infile) {
+        double sgi_gamma;
+
+        fgets(tmpline, 80, infile);
+        fclose(infile);
+        sgi_gamma = atof(tmpline);
+        if (sgi_gamma > 0.0)
+            LUT_exponent = 1.0 / sgi_gamma;
+    }
+#elif defined(Macintosh)
+    LUT_exponent = 1.8 / 2.61;
+    /*
+    if (some_mac_function_that_returns_gamma(&mac_gamma))
+        LUT_exponent = mac_gamma / 2.61;
+     */
+#else
+    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
+#endif
+
+    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+    default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+    /* If the user has set the SCREEN_GAMMA environment variable as suggested
+     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+     * use the default value we just calculated.  Either way, the user may
+     * override this via a command-line option. */
+
+    if ((p = getenv("SCREEN_GAMMA")) != NULL)
+        rpng2_info.display_exponent = atof(p);
+    else
+        rpng2_info.display_exponent = default_display_exponent;
+
+
+    /* Now parse the command line for options and the PNG filename. */
+
+    while (*++argv && !error) {
+        if (!strncmp(*argv, "-display", 2)) {
+            if (!*++argv)
+                ++error;
+            else
+                displayname = *argv;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                rpng2_info.display_exponent = atof(*argv);
+                if (rpng2_info.display_exponent <= 0.0)
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    have_bg = TRUE;
+                    bg_image = FALSE;
+                }
+            }
+        } else if (!strncmp(*argv, "-bgpat", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                pat = atoi(*argv);
+                if (pat >= 0 && pat < num_bgpat) {
+                    bg_image = TRUE;
+                    have_bg = FALSE;
+                } else
+                    ++error;
+            }
+        } else if (!strncmp(*argv, "-usleep", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                usleep_duration = (ulg)atol(*argv);
+                demo_timing = TRUE;
+            }
+        } else if (!strncmp(*argv, "-pause", 2)) {
+            pause_after_pass = TRUE;
+        } else if (!strncmp(*argv, "-timing", 2)) {
+            timing = TRUE;
+#ifdef FEATURE_LOOP
+        } else if (!strncmp(*argv, "-loop", 2)) {
+            loop = TRUE;
+            if (!argv[1] || !is_number(argv[1]))
+                loop_interval = 2;
+            else {
+                ++argv;
+                loop_interval = atol(*argv);
+                if (loop_interval < 0)
+                    loop_interval = 2;
+                else if (loop_interval > 100000)   /* bit more than one day */
+                    loop_interval = 100000;
+            }
+#endif
+        } else {
+            if (**argv != '-') {
+                filename = *argv;
+                if (argv[1])   /* shouldn't be any more args after filename */
+                    ++error;
+            } else
+                ++error;   /* not expecting any other options */
+        }
+    }
+
+    if (!filename)
+        ++error;
+
+
+    /* print usage screen if any errors up to this point */
+
+    if (error) {
+        fprintf(stderr, "\n%s %s:  %s\n\n", PROGNAME, VERSION, appname);
+        readpng2_version_info();
+        fprintf(stderr, "\n"
+          "Usage:  %s [-display xdpy] [-gamma exp] [-bgcolor bg | -bgpat pat]\n"
+#ifdef FEATURE_LOOP
+          "        %*s [-usleep dur | -timing] [-pause] [-loop [sec]] file.png\n\n"
+#else
+          "        %*s [-usleep dur | -timing] [-pause] file.png\n\n"
+#endif
+          "    xdpy\tname of the target X display (e.g., ``hostname:0'')\n"
+          "    exp \ttransfer-function exponent (``gamma'') of the display\n"
+          "\t\t  system in floating-point format (e.g., ``%.1f''); equal\n"
+          "\t\t  to the product of the lookup-table exponent (varies)\n"
+          "\t\t  and the CRT exponent (usually 2.2); must be positive\n"
+          "    bg  \tdesired background color in 7-character hex RGB format\n"
+          "\t\t  (e.g., ``#ff7700'' for orange:  same as HTML colors);\n"
+          "\t\t  used with transparent images; overrides -bgpat\n"
+          "    pat \tdesired background pattern number (0-%d); used with\n"
+          "\t\t  transparent images; overrides -bgcolor\n"
+#ifdef FEATURE_LOOP
+          "    -loop\tloops through background images after initial display\n"
+          "\t\t  is complete (depends on -bgpat)\n"
+          "    sec \tseconds to display each background image (default = 2)\n"
+#endif
+          "    dur \tduration in microseconds to wait after displaying each\n"
+          "\t\t  row (for demo purposes)\n"
+          "    -timing\tenables delay for every block read, to simulate modem\n"
+          "\t\t  download of image (~36 Kbps)\n"
+          "    -pause\tpauses after displaying each pass until mouse clicked\n"
+          "\nPress Q, Esc or mouse button 1 (within image window, after image\n"
+          "is displayed) to quit.\n"
+          "\n", PROGNAME,
+          (int)strlen(PROGNAME), " ", default_display_exponent, num_bgpat-1);
+        exit(1);
+    }
+
+
+    if (!(infile = fopen(filename, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open PNG file [%s]\n", filename);
+        ++error;
+    } else {
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+        if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
+            fprintf(stderr, PROGNAME
+              ":  [%s] is not a PNG file: incorrect signature\n",
+              filename);
+            ++error;
+        } else if ((rc = readpng2_init(&rpng2_info)) != 0) {
+            switch (rc) {
+                case 2:
+                    fprintf(stderr, PROGNAME
+                      ":  [%s] has bad IHDR (libpng longjmp)\n", filename);
+                    break;
+                case 4:
+                    fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                    break;
+                default:
+                    fprintf(stderr, PROGNAME
+                      ":  unknown readpng2_init() error\n");
+                    break;
+            }
+            ++error;
+        } else {
+            Trace((stderr, "about to call XOpenDisplay()\n"))
+            display = XOpenDisplay(displayname);
+            if (!display) {
+                readpng2_cleanup(&rpng2_info);
+                fprintf(stderr, PROGNAME ":  can't open X display [%s]\n",
+                  displayname? displayname : "default");
+                ++error;
+            }
+        }
+        if (error)
+            fclose(infile);
+    }
+
+
+    if (error) {
+        fprintf(stderr, PROGNAME ":  aborting.\n");
+        exit(2);
+    }
+
+
+    /* set the title-bar string, but make sure buffer doesn't overflow */
+
+    alen = strlen(appname);
+    flen = strlen(filename);
+    if (alen + flen + 3 > 1023)
+        sprintf(titlebar, "%s:  ...%s", appname, filename+(alen+flen+6-1023));
+    else
+        sprintf(titlebar, "%s:  %s", appname, filename);
+
+
+    /* set some final rpng2_info variables before entering main data loop */
+
+    if (have_bg) {
+        unsigned r, g, b;   /* this approach quiets compiler warnings */
+
+        sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+        rpng2_info.bg_red   = (uch)r;
+        rpng2_info.bg_green = (uch)g;
+        rpng2_info.bg_blue  = (uch)b;
+    } else
+        rpng2_info.need_bgcolor = TRUE;
+
+    rpng2_info.state = kPreInit;
+    rpng2_info.mainprog_init = rpng2_x_init;
+    rpng2_info.mainprog_display_row = rpng2_x_display_row;
+    rpng2_info.mainprog_finish_display = rpng2_x_finish_display;
+
+
+    /* OK, this is the fun part:  call readpng2_decode_data() at the start of
+     * the loop to deal with our first buffer of data (read in above to verify
+     * that the file is a PNG image), then loop through the file and continue
+     * calling the same routine to handle each chunk of data.  It in turn
+     * passes the data to libpng, which will invoke one or more of our call-
+     * backs as decoded data become available.  We optionally call sleep() for
+     * one second per iteration to simulate downloading the image via an analog
+     * modem. */
+
+    for (;;) {
+        Trace((stderr, "about to call readpng2_decode_data()\n"))
+        if (readpng2_decode_data(&rpng2_info, inbuf, incount))
+            ++error;
+        Trace((stderr, "done with readpng2_decode_data()\n"))
+
+        if (error || incount != INBUFSIZE || rpng2_info.state == kDone) {
+            if (rpng2_info.state == kDone) {
+                Trace((stderr, "done decoding PNG image\n"))
+            } else if (ferror(infile)) {
+                fprintf(stderr, PROGNAME
+                  ":  error while reading PNG image file\n");
+                exit(3);
+            } else if (feof(infile)) {
+                fprintf(stderr, PROGNAME ":  end of file reached "
+                  "(unexpectedly) while reading PNG image file\n");
+                exit(3);
+            } else /* if (error) */ {
+                /* will print error message below */
+            }
+            break;
+        }
+
+        if (timing)
+            sleep(1);
+
+        incount = fread(inbuf, 1, INBUFSIZE, infile);
+    }
+
+
+    /* clean up PNG stuff and report any decoding errors */
+
+    fclose(infile);
+    Trace((stderr, "about to call readpng2_cleanup()\n"))
+    readpng2_cleanup(&rpng2_info);
+
+    if (error) {
+        fprintf(stderr, PROGNAME ":  libpng error while decoding PNG image\n");
+        exit(3);
+    }
+
+
+#ifdef FEATURE_LOOP
+
+    if (loop && bg_image) {
+        Trace((stderr, "entering -loop loop (FEATURE_LOOP)\n"))
+        for (;;) {
+            int i, use_sleep;
+            struct timeval now, then;
+
+            /* get current time and add loop_interval to get target time */
+            if (gettimeofday(&then, NULL) == 0) {
+                then.tv_sec += loop_interval;
+                use_sleep = FALSE;
+            } else
+                use_sleep = TRUE;
+
+            /* do quick check for a quit event but don't wait for it */
+            /* GRR BUG:  should also check for Expose events and redraw... */
+            if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask, &e))
+                if (QUIT(e,k))
+                    break;
+
+            /* generate next background image */
+            if (++pat >= num_bgpat)
+                pat = 0;
+            rpng2_x_reload_bg_image();
+
+            /* wait for timeout, using whatever means are available */
+            if (use_sleep || gettimeofday(&now, NULL) != 0) {
+                for (i = loop_interval;  i > 0;  --i) {
+                    sleep(1);
+                    /* GRR BUG:  also need to check for Expose (and redraw!) */
+                    if (XCheckMaskEvent(display, KeyPressMask | ButtonPressMask,
+                        &e) && QUIT(e,k))
+                        break;
+                }
+            } else {
+                /* Y2038 BUG! */
+                if (now.tv_sec < then.tv_sec ||
+                    (now.tv_sec == then.tv_sec && now.tv_usec < then.tv_usec))
+                {
+                    int quit = FALSE;
+                    long seconds_to_go = then.tv_sec - now.tv_sec;
+                    long usleep_usec;
+
+                    /* basically chew up most of remaining loop-interval with
+                     *  calls to sleep(1) interleaved with checks for quit
+                     *  events, but also recalc time-to-go periodically; when
+                     *  done, clean up any remaining time with usleep() call
+                     *  (could also use SIGALRM, but signals are a pain...) */
+                    while (seconds_to_go-- > 1) {
+                        int seconds_done = 0;
+
+                        for (i = seconds_to_go;  i > 0 && !quit;  --i) {
+                            sleep(1);
+                            /* GRR BUG:  need to check for Expose and redraw */
+                            if (XCheckMaskEvent(display, KeyPressMask |
+                                ButtonPressMask, &e) && QUIT(e,k))
+                                quit = TRUE;
+                            if (++seconds_done > 1000)
+                                break;   /* time to redo seconds_to_go meas. */
+                        }
+                        if (quit)
+                            break;
+
+                        /* OK, more than 1000 seconds since last check:
+                         *  correct the time-to-go measurement for drift */
+                        if (gettimeofday(&now, NULL) == 0) {
+                            if (now.tv_sec >= then.tv_sec)
+                                break;
+                            seconds_to_go = then.tv_sec - now.tv_sec;
+                        } else
+                            ++seconds_to_go;  /* restore what we subtracted */
+                    }
+                    if (quit)
+                        break;   /* breaks outer do-loop, skips redisplay */
+
+                    /* since difference between "now" and "then" is already
+                     *  eaten up to within a couple of seconds, don't need to
+                     *  worry about overflow--but might have overshot (neg.) */
+                    if (gettimeofday(&now, NULL) == 0) {
+                        usleep_usec = 1000000L*(then.tv_sec - now.tv_sec) +
+                          then.tv_usec - now.tv_usec;
+                        if (usleep_usec > 0)
+                            usleep((ulg)usleep_usec);
+                    }
+                }
+            }
+
+            /* composite image against new background and display (note that
+             *  we do not take into account the time spent doing this...) */
+            rpng2_x_redisplay_image (0, 0, rpng2_info.width, rpng2_info.height);
+        }
+
+    } else /* FALL THROUGH and do the normal thing */
+
+#endif /* FEATURE_LOOP */
+
+    /* wait for the user to tell us when to quit */
+
+    if (rpng2_info.state >= kWindowInit) {
+        Trace((stderr, "entering final wait-for-quit-event loop\n"))
+        do {
+            XNextEvent(display, &e);
+            if (e.type == Expose) {
+                XExposeEvent *ex = (XExposeEvent *)&e;
+                rpng2_x_redisplay_image (ex->x, ex->y, ex->width, ex->height);
+            }
+        } while (!QUIT(e,k));
+    } else {
+        fprintf(stderr, PROGNAME ":  init callback never called:  probable "
+          "libpng error while decoding PNG metadata\n");
+        exit(4);
+    }
+
+
+    /* we're done:  clean up all image and X resources and go away */
+
+    Trace((stderr, "about to call rpng2_x_cleanup()\n"))
+    rpng2_x_cleanup();
+
+    return 0;
+}
+
+
+
+
+
+/* this function is called by readpng2_info_callback() in readpng2.c, which
+ * in turn is called by libpng after all of the pre-IDAT chunks have been
+ * read and processed--i.e., we now have enough info to finish initializing */
+
+static void rpng2_x_init(void)
+{
+    ulg i;
+    ulg rowbytes = rpng2_info.rowbytes;
+
+    Trace((stderr, "beginning rpng2_x_init()\n"))
+    Trace((stderr, "  rowbytes = %d\n", rpng2_info.rowbytes))
+    Trace((stderr, "  width  = %ld\n", rpng2_info.width))
+    Trace((stderr, "  height = %ld\n", rpng2_info.height))
+
+    rpng2_info.image_data = (uch *)malloc(rowbytes * rpng2_info.height);
+    if (!rpng2_info.image_data) {
+        readpng2_cleanup(&rpng2_info);
+        return;
+    }
+
+    rpng2_info.row_pointers = (uch **)malloc(rpng2_info.height * sizeof(uch *));
+    if (!rpng2_info.row_pointers) {
+        free(rpng2_info.image_data);
+        rpng2_info.image_data = NULL;
+        readpng2_cleanup(&rpng2_info);
+        return;
+    }
+
+    for (i = 0;  i < rpng2_info.height;  ++i)
+        rpng2_info.row_pointers[i] = rpng2_info.image_data + i*rowbytes;
+
+
+    /* do the basic X initialization stuff, make the window, and fill it with
+     * the user-specified, file-specified or default background color or
+     * pattern */
+
+    if (rpng2_x_create_window()) {
+
+        /* GRR TEMPORARY HACK:  this is fundamentally no different from cases
+         * above; libpng should call our error handler to longjmp() back to us
+         * when png_ptr goes away.  If we/it segfault instead, seems like a
+         * libpng bug... */
+
+        /* we're here via libpng callback, so if window fails, clean and bail */
+        readpng2_cleanup(&rpng2_info);
+        rpng2_x_cleanup();
+        exit(2);
+    }
+
+    rpng2_info.state = kWindowInit;
+}
+
+
+
+
+
+static int rpng2_x_create_window(void)
+{
+    ulg bg_red   = rpng2_info.bg_red;
+    ulg bg_green = rpng2_info.bg_green;
+    ulg bg_blue  = rpng2_info.bg_blue;
+    ulg bg_pixel = 0L;
+    ulg attrmask;
+    int need_colormap = FALSE;
+    int screen, pad;
+    uch *xdata;
+    Window root;
+    XEvent e;
+    XGCValues gcvalues;
+    XSetWindowAttributes attr;
+    XTextProperty windowName, *pWindowName = &windowName;
+    XTextProperty iconName, *pIconName = &iconName;
+    XVisualInfo visual_info;
+    XSizeHints *size_hints;
+    XWMHints *wm_hints;
+    XClassHint *class_hints;
+
+
+    Trace((stderr, "beginning rpng2_x_create_window()\n"))
+
+    screen = DefaultScreen(display);
+    depth = DisplayPlanes(display, screen);
+    root = RootWindow(display, screen);
+
+#ifdef DEBUG
+    XSynchronize(display, True);
+#endif
+
+    if (depth != 16 && depth != 24 && depth != 32) {
+        int visuals_matched = 0;
+
+        Trace((stderr, "default depth is %d:  checking other visuals\n",
+          depth))
+
+        /* 24-bit first */
+        visual_info.screen = screen;
+        visual_info.depth = 24;
+        visual_list = XGetVisualInfo(display,
+          VisualScreenMask | VisualDepthMask, &visual_info, &visuals_matched);
+        if (visuals_matched == 0) {
+/* GRR:  add 15-, 16- and 32-bit TrueColor visuals (also DirectColor?) */
+            fprintf(stderr, "default screen depth %d not supported, and no"
+              " 24-bit visuals found\n", depth);
+            return 2;
+        }
+        Trace((stderr, "XGetVisualInfo() returned %d 24-bit visuals\n",
+          visuals_matched))
+        visual = visual_list[0].visual;
+        depth = visual_list[0].depth;
+/*
+        colormap_size = visual_list[0].colormap_size;
+        visual_class = visual->class;
+        visualID = XVisualIDFromVisual(visual);
+ */
+        have_nondefault_visual = TRUE;
+        need_colormap = TRUE;
+    } else {
+        XMatchVisualInfo(display, screen, depth, TrueColor, &visual_info);
+        visual = visual_info.visual;
+    }
+
+    RMask = visual->red_mask;
+    GMask = visual->green_mask;
+    BMask = visual->blue_mask;
+
+/* GRR:  add/check 8-bit support */
+    if (depth == 8 || need_colormap) {
+        colormap = XCreateColormap(display, root, visual, AllocNone);
+        if (!colormap) {
+            fprintf(stderr, "XCreateColormap() failed\n");
+            return 2;
+        }
+        have_colormap = TRUE;
+        if (depth == 8)
+            bg_image = FALSE;   /* gradient just wastes palette entries */
+    }
+    if (depth == 15 || depth == 16) {
+        RShift = 15 - rpng2_x_msb(RMask);    /* these are right-shifts */
+        GShift = 15 - rpng2_x_msb(GMask);
+        BShift = 15 - rpng2_x_msb(BMask);
+    } else if (depth > 16) {
+        RShift = rpng2_x_msb(RMask) - 7;     /* these are left-shifts */
+        GShift = rpng2_x_msb(GMask) - 7;
+        BShift = rpng2_x_msb(BMask) - 7;
+    }
+    if (depth >= 15 && (RShift < 0 || GShift < 0 || BShift < 0)) {
+        fprintf(stderr, "rpng2 internal logic error:  negative X shift(s)!\n");
+        return 2;
+    }
+
+/*---------------------------------------------------------------------------
+    Finally, create the window.
+  ---------------------------------------------------------------------------*/
+
+    attr.backing_store = Always;
+    attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask;
+    attrmask = CWBackingStore | CWEventMask;
+    if (have_nondefault_visual) {
+        attr.colormap = colormap;
+        attr.background_pixel = 0;
+        attr.border_pixel = 1;
+        attrmask |= CWColormap | CWBackPixel | CWBorderPixel;
+    }
+
+    window = XCreateWindow(display, root, 0, 0, rpng2_info.width,
+      rpng2_info.height, 0, depth, InputOutput, visual, attrmask, &attr);
+
+    if (window == None) {
+        fprintf(stderr, "XCreateWindow() failed\n");
+        return 2;
+    } else
+        have_window = TRUE;
+
+    if (depth == 8)
+        XSetWindowColormap(display, window, colormap);
+
+    if (!XStringListToTextProperty(&window_name, 1, pWindowName))
+        pWindowName = NULL;
+    if (!XStringListToTextProperty(&icon_name, 1, pIconName))
+        pIconName = NULL;
+
+    /* OK if either hints allocation fails; XSetWMProperties() allows NULLs */
+
+    if ((size_hints = XAllocSizeHints()) != NULL) {
+        /* window will not be resizable */
+        size_hints->flags = PMinSize | PMaxSize;
+        size_hints->min_width = size_hints->max_width = (int)rpng2_info.width;
+        size_hints->min_height = size_hints->max_height =
+          (int)rpng2_info.height;
+    }
+
+    if ((wm_hints = XAllocWMHints()) != NULL) {
+        wm_hints->initial_state = NormalState;
+        wm_hints->input = True;
+     /* wm_hints->icon_pixmap = icon_pixmap; */
+        wm_hints->flags = StateHint | InputHint  /* | IconPixmapHint */ ;
+    }
+
+    if ((class_hints = XAllocClassHint()) != NULL) {
+        class_hints->res_name = res_name;
+        class_hints->res_class = res_class;
+    }
+
+    XSetWMProperties(display, window, pWindowName, pIconName, NULL, 0,
+      size_hints, wm_hints, class_hints);
+
+    /* various properties and hints no longer needed; free memory */
+    if (pWindowName)
+       XFree(pWindowName->value);
+    if (pIconName)
+       XFree(pIconName->value);
+    if (size_hints)
+        XFree(size_hints);
+    if (wm_hints)
+       XFree(wm_hints);
+    if (class_hints)
+       XFree(class_hints);
+
+    XMapWindow(display, window);
+
+    gc = XCreateGC(display, window, 0, &gcvalues);
+    have_gc = TRUE;
+
+/*---------------------------------------------------------------------------
+    Allocate memory for the X- and display-specific version of the image.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        xdata = (uch *)malloc(4*rpng2_info.width*rpng2_info.height);
+        pad = 32;
+    } else if (depth == 16) {
+        xdata = (uch *)malloc(2*rpng2_info.width*rpng2_info.height);
+        pad = 16;
+    } else /* depth == 8 */ {
+        xdata = (uch *)malloc(rpng2_info.width*rpng2_info.height);
+        pad = 8;
+    }
+
+    if (!xdata) {
+        fprintf(stderr, PROGNAME ":  unable to allocate image memory\n");
+        return 4;
+    }
+
+    ximage = XCreateImage(display, visual, depth, ZPixmap, 0,
+      (char *)xdata, rpng2_info.width, rpng2_info.height, pad, 0);
+
+    if (!ximage) {
+        fprintf(stderr, PROGNAME ":  XCreateImage() failed\n");
+        free(xdata);
+        return 3;
+    }
+
+    /* to avoid testing the byte order every pixel (or doubling the size of
+     * the drawing routine with a giant if-test), we arbitrarily set the byte
+     * order to MSBFirst and let Xlib worry about inverting things on little-
+     * endian machines (e.g., Linux/x86, old VAXen, etc.)--this is not the
+     * most efficient approach (the giant if-test would be better), but in
+     * the interest of clarity, we'll take the easy way out... */
+
+    ximage->byte_order = MSBFirst;
+
+/*---------------------------------------------------------------------------
+    Fill window with the specified background color (default is black) or
+    faked "background image" (but latter is disabled if 8-bit; gradients
+    just waste palette entries).
+  ---------------------------------------------------------------------------*/
+
+    if (bg_image)
+        rpng2_x_load_bg_image();    /* resets bg_image if fails */
+
+    if (!bg_image) {
+        if (depth == 24 || depth == 32) {
+            bg_pixel = (bg_red   << RShift) |
+                       (bg_green << GShift) |
+                       (bg_blue  << BShift);
+        } else if (depth == 16) {
+            bg_pixel = (((bg_red   << 8) >> RShift) & RMask) |
+                       (((bg_green << 8) >> GShift) & GMask) |
+                       (((bg_blue  << 8) >> BShift) & BMask);
+        } else /* depth == 8 */ {
+
+            /* GRR:  add 8-bit support */
+
+        }
+        XSetForeground(display, gc, bg_pixel);
+        XFillRectangle(display, window, gc, 0, 0, rpng2_info.width,
+          rpng2_info.height);
+    }
+
+/*---------------------------------------------------------------------------
+    Wait for first Expose event to do any drawing, then flush and return.
+  ---------------------------------------------------------------------------*/
+
+    do
+        XNextEvent(display, &e);
+    while (e.type != Expose || e.xexpose.count);
+
+    XFlush(display);
+
+    return 0;
+
+} /* end function rpng2_x_create_window() */
+
+
+
+
+
+static int rpng2_x_load_bg_image(void)
+{
+    uch *src;
+    char *dest;
+    uch r1, r2, g1, g2, b1, b2;
+    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
+    int k, hmax, max;
+    int xidx, yidx, yidx_max;
+    int even_odd_vert, even_odd_horiz, even_odd;
+    int invert_gradient2 = (bg[pat].type & 0x08);
+    int invert_column;
+    int ximage_rowbytes = ximage->bytes_per_line;
+    ulg i, row;
+    ulg pixel;
+
+/*---------------------------------------------------------------------------
+    Allocate buffer for fake background image to be used with transparent
+    images; if this fails, revert to plain background color.
+  ---------------------------------------------------------------------------*/
+
+    bg_rowbytes = 3 * rpng2_info.width;
+    bg_data = (uch *)malloc(bg_rowbytes * rpng2_info.height);
+    if (!bg_data) {
+        fprintf(stderr, PROGNAME
+          ":  unable to allocate memory for background image\n");
+        bg_image = 0;
+        return 1;
+    }
+
+    bgscale = (pat == 0)? 8 : bgscale_default;
+    yidx_max = bgscale - 1;
+
+/*---------------------------------------------------------------------------
+    Vertical gradients (ramps) in NxN squares, alternating direction and
+    colors (N == bgscale).
+  ---------------------------------------------------------------------------*/
+
+    if ((bg[pat].type & 0x07) == 0) {
+        uch r1_min  = rgb[bg[pat].rgb1_min].r;
+        uch g1_min  = rgb[bg[pat].rgb1_min].g;
+        uch b1_min  = rgb[bg[pat].rgb1_min].b;
+        uch r2_min  = rgb[bg[pat].rgb2_min].r;
+        uch g2_min  = rgb[bg[pat].rgb2_min].g;
+        uch b2_min  = rgb[bg[pat].rgb2_min].b;
+        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
+        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
+        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
+        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
+        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
+        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = (int)(row % bgscale);
+            even_odd_vert = (int)((row / bgscale) & 1);
+
+            r1 = r1_min + (r1_diff * yidx) / yidx_max;
+            g1 = g1_min + (g1_diff * yidx) / yidx_max;
+            b1 = b1_min + (b1_diff * yidx) / yidx_max;
+            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
+            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
+            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
+
+            r2 = r2_min + (r2_diff * yidx) / yidx_max;
+            g2 = g2_min + (g2_diff * yidx) / yidx_max;
+            b2 = b2_min + (b2_diff * yidx) / yidx_max;
+            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
+            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
+            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
+
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                even_odd_horiz = (int)((i / bgscale) & 1);
+                even_odd = even_odd_vert ^ even_odd_horiz;
+                invert_column =
+                  (even_odd_horiz && (bg[pat].type & 0x10));
+                if (even_odd == 0) {        /* gradient #1 */
+                    if (invert_column) {
+                        *dest++ = r1_inv;
+                        *dest++ = g1_inv;
+                        *dest++ = b1_inv;
+                    } else {
+                        *dest++ = r1;
+                        *dest++ = g1;
+                        *dest++ = b1;
+                    }
+                } else {                    /* gradient #2 */
+                    if ((invert_column && invert_gradient2) ||
+                        (!invert_column && !invert_gradient2))
+                    {
+                        *dest++ = r2;       /* not inverted or */
+                        *dest++ = g2;       /*  doubly inverted */
+                        *dest++ = b2;
+                    } else {
+                        *dest++ = r2_inv;
+                        *dest++ = g2_inv;   /* singly inverted */
+                        *dest++ = b2_inv;
+                    }
+                }
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam
+    M. Costello.
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 1) {
+
+        hmax = (bgscale-1)/2;   /* half the max weight of a color */
+        max = 2*hmax;           /* the max weight of a color */
+
+        r1 = rgb[bg[pat].rgb1_max].r;
+        g1 = rgb[bg[pat].rgb1_max].g;
+        b1 = rgb[bg[pat].rgb1_max].b;
+        r2 = rgb[bg[pat].rgb2_max].r;
+        g2 = rgb[bg[pat].rgb2_max].g;
+        b2 = rgb[bg[pat].rgb2_max].b;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = (int)(row % bgscale);
+            if (yidx > hmax)
+                yidx = bgscale-1 - yidx;
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                xidx = (int)(i % bgscale);
+                if (xidx > hmax)
+                    xidx = bgscale-1 - xidx;
+                k = xidx + yidx;
+                *dest++ = (k*r1 + (max-k)*r2) / max;
+                *dest++ = (k*g1 + (max-k)*g2) / max;
+                *dest++ = (k*b1 + (max-k)*b2) / max;
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
+    soids will equal bgscale?].  This one is slow but very cool.  Code con-
+    tributed by Pieter S. van der Meulen (originally in Smalltalk).
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 2) {
+        uch ch;
+        int ii, x, y, hw, hh, grayspot;
+        double freq, rotate, saturate, gray, intensity;
+        double angle=0.0, aoffset=0.0, maxDist, dist;
+        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
+
+        fprintf(stderr, "%s:  computing radial background...",
+          PROGNAME);
+        fflush(stderr);
+
+        hh = (int)(rpng2_info.height / 2);
+        hw = (int)(rpng2_info.width / 2);
+
+        /* variables for radial waves:
+         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
+         *   freq:  number of color beams originating from the center
+         *   grayspot:  size of the graying center area (anti-alias)
+         *   rotate:  rotation of the beams as a function of radius
+         *   saturate:  saturation of beams' shape azimuthally
+         */
+        angle = CLIP(angle, 0.0, 360.0);
+        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
+        freq = MAX((double)bg[pat].bg_freq, 0.0);
+        saturate = (double)bg[pat].bg_bsat * 0.1;
+        rotate = (double)bg[pat].bg_brot * 0.1;
+        gray = 0.0;
+        intensity = 0.0;
+        maxDist = (double)((hw*hw) + (hh*hh));
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            y = (int)(row - hh);
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                x = (int)(i - hw);
+                angle = (x == 0)? PI_2 : atan((double)y / (double)x);
+                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
+                gray = MIN(1.0, gray);
+                dist = (double)((x*x) + (y*y)) / maxDist;
+                intensity = cos((angle+(rotate*dist*PI)) * freq) *
+                  gray * saturate;
+                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
+                hue = (angle + PI) * INV_PI_360 + aoffset;
+                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
+                s = MIN(MAX(s,0.0), 1.0);
+                v = MIN(MAX(intensity,0.0), 1.0);
+
+                if (s == 0.0) {
+                    ch = (uch)(v * 255.0);
+                    *dest++ = ch;
+                    *dest++ = ch;
+                    *dest++ = ch;
+                } else {
+                    if ((hue < 0.0) || (hue >= 360.0))
+                        hue -= (((int)(hue / 360.0)) * 360.0);
+                    hue /= 60.0;
+                    ii = (int)hue;
+                    f = hue - (double)ii;
+                    p = (1.0 - s) * v;
+                    q = (1.0 - (s * f)) * v;
+                    t = (1.0 - (s * (1.0 - f))) * v;
+                    if      (ii == 0) { red = v; green = t; blue = p; }
+                    else if (ii == 1) { red = q; green = v; blue = p; }
+                    else if (ii == 2) { red = p; green = v; blue = t; }
+                    else if (ii == 3) { red = p; green = q; blue = v; }
+                    else if (ii == 4) { red = t; green = p; blue = v; }
+                    else if (ii == 5) { red = v; green = p; blue = q; }
+                    *dest++ = (uch)(red * 255.0);
+                    *dest++ = (uch)(green * 255.0);
+                    *dest++ = (uch)(blue * 255.0);
+                }
+            }
+        }
+        fprintf(stderr, "done.\n");
+        fflush(stderr);
+    }
+
+/*---------------------------------------------------------------------------
+    Blast background image to display buffer before beginning PNG decode.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        ulg red, green, blue;
+        int bpp = ximage->bits_per_pixel;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            src = bg_data + row*bg_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            if (bpp == 32) {    /* slightly optimized version */
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    red   = *src++;
+                    green = *src++;
+                    blue  = *src++;
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            } else {
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    red   = *src++;
+                    green = *src++;
+                    blue  = *src++;
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */
+                    /*           (probably need to use RShift, RMask, etc.) */
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+        }
+
+    } else if (depth == 16) {
+        ush red, green, blue;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            src = bg_data + row*bg_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                red   = ((ush)(*src) << 8);  ++src;
+                green = ((ush)(*src) << 8);  ++src;
+                blue  = ((ush)(*src) << 8);  ++src;
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
+            }
+        }
+
+    } else /* depth == 8 */ {
+
+        /* GRR:  add 8-bit support */
+
+    }
+
+    XPutImage(display, window, gc, ximage, 0, 0, 0, 0, rpng2_info.width,
+      rpng2_info.height);
+
+    return 0;
+
+} /* end function rpng2_x_load_bg_image() */
+
+
+
+
+
+static void rpng2_x_display_row(ulg row)
+{
+    uch bg_red   = rpng2_info.bg_red;
+    uch bg_green = rpng2_info.bg_green;
+    uch bg_blue  = rpng2_info.bg_blue;
+    uch *src, *src2=NULL;
+    char *dest;
+    uch r, g, b, a;
+    int ximage_rowbytes = ximage->bytes_per_line;
+    ulg i, pixel;
+    static int rows=0, prevpass=(-1);
+    static ulg firstrow;
+
+/*---------------------------------------------------------------------------
+    rows and firstrow simply track how many rows (and which ones) have not
+    yet been displayed; alternatively, we could call XPutImage() for every
+    row and not bother with the records-keeping.
+  ---------------------------------------------------------------------------*/
+
+    Trace((stderr, "beginning rpng2_x_display_row()\n"))
+
+    if (rpng2_info.pass != prevpass) {
+        if (pause_after_pass && rpng2_info.pass > 0) {
+            XEvent e;
+            KeySym k;
+
+            fprintf(stderr,
+              "%s:  end of pass %d of 7; click in image window to continue\n",
+              PROGNAME, prevpass + 1);
+            do
+                XNextEvent(display, &e);
+            while (!QUIT(e,k));
+        }
+        fprintf(stderr, "%s:  pass %d of 7\r", PROGNAME, rpng2_info.pass + 1);
+        fflush(stderr);
+        prevpass = rpng2_info.pass;
+    }
+
+    if (rows == 0)
+        firstrow = row;   /* first row that is not yet displayed */
+
+    ++rows;   /* count of rows received but not yet displayed */
+
+/*---------------------------------------------------------------------------
+    Aside from the use of the rpng2_info struct, the lack of an outer loop
+    (over rows) and moving the XPutImage() call outside the "if (depth)"
+    tests, this routine is identical to rpng_x_display_image() in the non-
+    progressive version of the program.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        ulg red, green, blue;
+        int bpp = ximage->bits_per_pixel;
+
+        src = rpng2_info.image_data + row*rpng2_info.rowbytes;
+        if (bg_image)
+            src2 = bg_data + row*bg_rowbytes;
+        dest = ximage->data + row*ximage_rowbytes;
+        if (rpng2_info.channels == 3) {
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                red   = *src++;
+                green = *src++;
+                blue  = *src++;
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                if (bpp == 32) {
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                } else {
+                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */
+                    /*           (probably need to use RShift, RMask, etc.) */
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+        } else /* if (rpng2_info.channels == 4) */ {
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                a = *src++;
+                if (bg_image) {
+                    bg_red   = *src2++;
+                    bg_green = *src2++;
+                    bg_blue  = *src2++;
+                }
+                if (a == 255) {
+                    red   = r;
+                    green = g;
+                    blue  = b;
+                } else if (a == 0) {
+                    red   = bg_red;
+                    green = bg_green;
+                    blue  = bg_blue;
+                } else {
+                    /* this macro (from png.h) composites the foreground
+                     * and background values and puts the result into the
+                     * first argument */
+                    alpha_composite(red,   r, a, bg_red);
+                    alpha_composite(green, g, a, bg_green);
+                    alpha_composite(blue,  b, a, bg_blue);
+                }
+                pixel = (red   << RShift) |
+                        (green << GShift) |
+                        (blue  << BShift);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                if (bpp == 32) {
+                    *dest++ = (char)((pixel >> 24) & 0xff);
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                } else {
+                    /* GRR BUG?  this assumes bpp == 24 & bits are packed low */
+                    /*           (probably need to use RShift, RMask, etc.) */
+                    *dest++ = (char)((pixel >> 16) & 0xff);
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+        }
+
+    } else if (depth == 16) {
+        ush red, green, blue;
+
+        src = rpng2_info.row_pointers[row];
+        if (bg_image)
+            src2 = bg_data + row*bg_rowbytes;
+        dest = ximage->data + row*ximage_rowbytes;
+        if (rpng2_info.channels == 3) {
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                red   = ((ush)(*src) << 8);
+                ++src;
+                green = ((ush)(*src) << 8);
+                ++src;
+                blue  = ((ush)(*src) << 8);
+                ++src;
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
+            }
+        } else /* if (rpng2_info.channels == 4) */ {
+            for (i = rpng2_info.width;  i > 0;  --i) {
+                r = *src++;
+                g = *src++;
+                b = *src++;
+                a = *src++;
+                if (bg_image) {
+                    bg_red   = *src2++;
+                    bg_green = *src2++;
+                    bg_blue  = *src2++;
+                }
+                if (a == 255) {
+                    red   = ((ush)r << 8);
+                    green = ((ush)g << 8);
+                    blue  = ((ush)b << 8);
+                } else if (a == 0) {
+                    red   = ((ush)bg_red   << 8);
+                    green = ((ush)bg_green << 8);
+                    blue  = ((ush)bg_blue  << 8);
+                } else {
+                    /* this macro (from png.h) composites the foreground
+                     * and background values and puts the result back into
+                     * the first argument (== fg byte here:  safe) */
+                    alpha_composite(r, r, a, bg_red);
+                    alpha_composite(g, g, a, bg_green);
+                    alpha_composite(b, b, a, bg_blue);
+                    red   = ((ush)r << 8);
+                    green = ((ush)g << 8);
+                    blue  = ((ush)b << 8);
+                }
+                pixel = ((red   >> RShift) & RMask) |
+                        ((green >> GShift) & GMask) |
+                        ((blue  >> BShift) & BMask);
+                /* recall that we set ximage->byte_order = MSBFirst above */
+                *dest++ = (char)((pixel >>  8) & 0xff);
+                *dest++ = (char)( pixel        & 0xff);
+            }
+        }
+
+    } else /* depth == 8 */ {
+
+        /* GRR:  add 8-bit support */
+
+    }
+
+
+/*---------------------------------------------------------------------------
+    Display after every 16 rows or when on one of last two rows.  (Region
+    may include previously displayed lines due to interlacing--i.e., not
+    contiguous.  Also, second-to-last row is final one in interlaced images
+    with odd number of rows.)  For demos, flush (and delay) after every 16th
+    row so "sparse" passes don't go twice as fast.
+  ---------------------------------------------------------------------------*/
+
+    if (demo_timing && (row - firstrow >= 16 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
+        XFlush(display);
+        rows = 0;
+        usleep(usleep_duration);
+    } else
+    if (!demo_timing && ((rows & 0xf) == 0 || row >= rpng2_info.height-2)) {
+        XPutImage(display, window, gc, ximage, 0, (int)firstrow, 0,
+          (int)firstrow, rpng2_info.width, row - firstrow + 1);
+        XFlush(display);
+        rows = 0;
+    }
+
+}
+
+
+
+
+
+static void rpng2_x_finish_display(void)
+{
+    Trace((stderr, "beginning rpng2_x_finish_display()\n"))
+
+    /* last row has already been displayed by rpng2_x_display_row(), so we
+     * have nothing to do here except set a flag and let the user know that
+     * the image is done */
+
+    rpng2_info.state = kDone;
+    printf(
+      "Done.  Press Q, Esc or mouse button 1 (within image window) to quit.\n");
+    fflush(stdout);
+}
+
+
+
+
+
+static void rpng2_x_redisplay_image(ulg startcol, ulg startrow,
+                                    ulg width, ulg height)
+{
+    uch bg_red   = rpng2_info.bg_red;
+    uch bg_green = rpng2_info.bg_green;
+    uch bg_blue  = rpng2_info.bg_blue;
+    uch *src, *src2=NULL;
+    char *dest;
+    uch r, g, b, a;
+    ulg i, row, lastrow = 0;
+    ulg pixel;
+    int ximage_rowbytes = ximage->bytes_per_line;
+
+
+    Trace((stderr, "beginning display loop (image_channels == %d)\n",
+      rpng2_info.channels))
+    Trace((stderr, "   (width = %ld, rowbytes = %d, ximage_rowbytes = %d)\n",
+      rpng2_info.width, rpng2_info.rowbytes, ximage_rowbytes))
+    Trace((stderr, "   (bpp = %d)\n", ximage->bits_per_pixel))
+    Trace((stderr, "   (byte_order = %s)\n", ximage->byte_order == MSBFirst?
+      "MSBFirst" : (ximage->byte_order == LSBFirst? "LSBFirst" : "unknown")))
+
+/*---------------------------------------------------------------------------
+    Aside from the use of the rpng2_info struct and of src2 (for background
+    image), this routine is identical to rpng_x_display_image() in the non-
+    progressive version of the program--for the simple reason that redisplay
+    of the image against a new background happens after the image is fully
+    decoded and therefore is, by definition, non-progressive.
+  ---------------------------------------------------------------------------*/
+
+    if (depth == 24 || depth == 32) {
+        ulg red, green, blue;
+        int bpp = ximage->bits_per_pixel;
+
+        for (lastrow = row = startrow;  row < startrow+height;  ++row) {
+            src = rpng2_info.image_data + row*rpng2_info.rowbytes;
+            if (bg_image)
+                src2 = bg_data + row*bg_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            if (rpng2_info.channels == 3) {
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    red   = *src++;
+                    green = *src++;
+                    blue  = *src++;
+#ifdef NO_24BIT_MASKS
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    if (bpp == 32) {
+                        *dest++ = (char)((pixel >> 24) & 0xff);
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    } else {
+                        /* this assumes bpp == 24 & bits are packed low */
+                        /* (probably need to use RShift, RMask, etc.) */
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    }
+#else
+                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;
+                    green = (GShift < 0)? green << (-GShift) : green >> GShift;
+                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;
+                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    if (bpp == 32) {
+                        *dest++ = (char)((pixel >> 24) & 0xff);
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    } else {
+                        /* GRR BUG */
+                        /* this assumes bpp == 24 & bits are packed low */
+                        /* (probably need to use RShift/RMask/etc. here, too) */
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    }
+#endif
+                }
+
+            } else /* if (rpng2_info.channels == 4) */ {
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    r = *src++;
+                    g = *src++;
+                    b = *src++;
+                    a = *src++;
+                    if (bg_image) {
+                        bg_red   = *src2++;
+                        bg_green = *src2++;
+                        bg_blue  = *src2++;
+                    }
+                    if (a == 255) {
+                        red   = r;
+                        green = g;
+                        blue  = b;
+                    } else if (a == 0) {
+                        red   = bg_red;
+                        green = bg_green;
+                        blue  = bg_blue;
+                    } else {
+                        /* this macro (from png.h) composites the foreground
+                         * and background values and puts the result into the
+                         * first argument */
+                        alpha_composite(red,   r, a, bg_red);
+                        alpha_composite(green, g, a, bg_green);
+                        alpha_composite(blue,  b, a, bg_blue);
+                    }
+#ifdef NO_24BIT_MASKS
+                    pixel = (red   << RShift) |
+                            (green << GShift) |
+                            (blue  << BShift);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    if (bpp == 32) {
+                        *dest++ = (char)((pixel >> 24) & 0xff);
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    } else {
+                        /* this assumes bpp == 24 & bits are packed low */
+                        /* (probably need to use RShift, RMask, etc.) */
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    }
+#else
+                    red   = (RShift < 0)? red   << (-RShift) : red   >> RShift;
+                    green = (GShift < 0)? green << (-GShift) : green >> GShift;
+                    blue  = (BShift < 0)? blue  << (-BShift) : blue  >> BShift;
+                    pixel = (red & RMask) | (green & GMask) | (blue & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    if (bpp == 32) {
+                        *dest++ = (char)((pixel >> 24) & 0xff);
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    } else {
+                        /* GRR BUG */
+                        /* this assumes bpp == 24 & bits are packed low */
+                        /* (probably need to use RShift/RMask/etc. here, too) */
+                        *dest++ = (char)((pixel >> 16) & 0xff);
+                        *dest++ = (char)((pixel >>  8) & 0xff);
+                        *dest++ = (char)( pixel        & 0xff);
+                    }
+#endif
+                }
+            }
+            /* display after every 16 lines */
+            if (((row+1) & 0xf) == 0) {
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, rpng2_info.width, 16);
+                XFlush(display);
+                lastrow = row + 1;
+            }
+        }
+
+    } else if (depth == 16) {
+        ush red, green, blue;
+
+        for (lastrow = row = startrow;  row < startrow+height;  ++row) {
+            src = rpng2_info.row_pointers[row];
+            if (bg_image)
+                src2 = bg_data + row*bg_rowbytes;
+            dest = ximage->data + row*ximage_rowbytes;
+            if (rpng2_info.channels == 3) {
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    red   = ((ush)(*src) << 8);
+                    ++src;
+                    green = ((ush)(*src) << 8);
+                    ++src;
+                    blue  = ((ush)(*src) << 8);
+                    ++src;
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            } else /* if (rpng2_info.channels == 4) */ {
+                for (i = rpng2_info.width;  i > 0;  --i) {
+                    r = *src++;
+                    g = *src++;
+                    b = *src++;
+                    a = *src++;
+                    if (bg_image) {
+                        bg_red   = *src2++;
+                        bg_green = *src2++;
+                        bg_blue  = *src2++;
+                    }
+                    if (a == 255) {
+                        red   = ((ush)r << 8);
+                        green = ((ush)g << 8);
+                        blue  = ((ush)b << 8);
+                    } else if (a == 0) {
+                        red   = ((ush)bg_red   << 8);
+                        green = ((ush)bg_green << 8);
+                        blue  = ((ush)bg_blue  << 8);
+                    } else {
+                        /* this macro (from png.h) composites the foreground
+                         * and background values and puts the result back into
+                         * the first argument (== fg byte here:  safe) */
+                        alpha_composite(r, r, a, bg_red);
+                        alpha_composite(g, g, a, bg_green);
+                        alpha_composite(b, b, a, bg_blue);
+                        red   = ((ush)r << 8);
+                        green = ((ush)g << 8);
+                        blue  = ((ush)b << 8);
+                    }
+                    pixel = ((red   >> RShift) & RMask) |
+                            ((green >> GShift) & GMask) |
+                            ((blue  >> BShift) & BMask);
+                    /* recall that we set ximage->byte_order = MSBFirst above */
+                    *dest++ = (char)((pixel >>  8) & 0xff);
+                    *dest++ = (char)( pixel        & 0xff);
+                }
+            }
+            /* display after every 16 lines */
+            if (((row+1) & 0xf) == 0) {
+                XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+                  (int)lastrow, rpng2_info.width, 16);
+                XFlush(display);
+                lastrow = row + 1;
+            }
+        }
+
+    } else /* depth == 8 */ {
+
+        /* GRR:  add 8-bit support */
+
+    }
+
+    Trace((stderr, "calling final XPutImage()\n"))
+    if (lastrow < startrow+height) {
+        XPutImage(display, window, gc, ximage, 0, (int)lastrow, 0,
+          (int)lastrow, rpng2_info.width, rpng2_info.height-lastrow);
+        XFlush(display);
+    }
+
+} /* end function rpng2_x_redisplay_image() */
+
+
+
+
+
+#ifdef FEATURE_LOOP
+
+static void rpng2_x_reload_bg_image(void)
+{
+    char *dest;
+    uch r1, r2, g1, g2, b1, b2;
+    uch r1_inv, r2_inv, g1_inv, g2_inv, b1_inv, b2_inv;
+    int k, hmax, max;
+    int xidx, yidx, yidx_max;
+    int even_odd_vert, even_odd_horiz, even_odd;
+    int invert_gradient2 = (bg[pat].type & 0x08);
+    int invert_column;
+    ulg i, row;
+
+
+    bgscale = (pat == 0)? 8 : bgscale_default;
+    yidx_max = bgscale - 1;
+
+/*---------------------------------------------------------------------------
+    Vertical gradients (ramps) in NxN squares, alternating direction and
+    colors (N == bgscale).
+  ---------------------------------------------------------------------------*/
+
+    if ((bg[pat].type & 0x07) == 0) {
+        uch r1_min  = rgb[bg[pat].rgb1_min].r;
+        uch g1_min  = rgb[bg[pat].rgb1_min].g;
+        uch b1_min  = rgb[bg[pat].rgb1_min].b;
+        uch r2_min  = rgb[bg[pat].rgb2_min].r;
+        uch g2_min  = rgb[bg[pat].rgb2_min].g;
+        uch b2_min  = rgb[bg[pat].rgb2_min].b;
+        int r1_diff = rgb[bg[pat].rgb1_max].r - r1_min;
+        int g1_diff = rgb[bg[pat].rgb1_max].g - g1_min;
+        int b1_diff = rgb[bg[pat].rgb1_max].b - b1_min;
+        int r2_diff = rgb[bg[pat].rgb2_max].r - r2_min;
+        int g2_diff = rgb[bg[pat].rgb2_max].g - g2_min;
+        int b2_diff = rgb[bg[pat].rgb2_max].b - b2_min;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = (int)(row % bgscale);
+            even_odd_vert = (int)((row / bgscale) & 1);
+
+            r1 = r1_min + (r1_diff * yidx) / yidx_max;
+            g1 = g1_min + (g1_diff * yidx) / yidx_max;
+            b1 = b1_min + (b1_diff * yidx) / yidx_max;
+            r1_inv = r1_min + (r1_diff * (yidx_max-yidx)) / yidx_max;
+            g1_inv = g1_min + (g1_diff * (yidx_max-yidx)) / yidx_max;
+            b1_inv = b1_min + (b1_diff * (yidx_max-yidx)) / yidx_max;
+
+            r2 = r2_min + (r2_diff * yidx) / yidx_max;
+            g2 = g2_min + (g2_diff * yidx) / yidx_max;
+            b2 = b2_min + (b2_diff * yidx) / yidx_max;
+            r2_inv = r2_min + (r2_diff * (yidx_max-yidx)) / yidx_max;
+            g2_inv = g2_min + (g2_diff * (yidx_max-yidx)) / yidx_max;
+            b2_inv = b2_min + (b2_diff * (yidx_max-yidx)) / yidx_max;
+
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                even_odd_horiz = (int)((i / bgscale) & 1);
+                even_odd = even_odd_vert ^ even_odd_horiz;
+                invert_column =
+                  (even_odd_horiz && (bg[pat].type & 0x10));
+                if (even_odd == 0) {        /* gradient #1 */
+                    if (invert_column) {
+                        *dest++ = r1_inv;
+                        *dest++ = g1_inv;
+                        *dest++ = b1_inv;
+                    } else {
+                        *dest++ = r1;
+                        *dest++ = g1;
+                        *dest++ = b1;
+                    }
+                } else {                    /* gradient #2 */
+                    if ((invert_column && invert_gradient2) ||
+                        (!invert_column && !invert_gradient2))
+                    {
+                        *dest++ = r2;       /* not inverted or */
+                        *dest++ = g2;       /*  doubly inverted */
+                        *dest++ = b2;
+                    } else {
+                        *dest++ = r2_inv;
+                        *dest++ = g2_inv;   /* singly inverted */
+                        *dest++ = b2_inv;
+                    }
+                }
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Soft gradient-diamonds with scale = bgscale.  Code contributed by Adam
+    M. Costello.
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 1) {
+
+        hmax = (bgscale-1)/2;   /* half the max weight of a color */
+        max = 2*hmax;           /* the max weight of a color */
+
+        r1 = rgb[bg[pat].rgb1_max].r;
+        g1 = rgb[bg[pat].rgb1_max].g;
+        b1 = rgb[bg[pat].rgb1_max].b;
+        r2 = rgb[bg[pat].rgb2_max].r;
+        g2 = rgb[bg[pat].rgb2_max].g;
+        b2 = rgb[bg[pat].rgb2_max].b;
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            yidx = (int)(row % bgscale);
+            if (yidx > hmax)
+                yidx = bgscale-1 - yidx;
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                xidx = (int)(i % bgscale);
+                if (xidx > hmax)
+                    xidx = bgscale-1 - xidx;
+                k = xidx + yidx;
+                *dest++ = (k*r1 + (max-k)*r2) / max;
+                *dest++ = (k*g1 + (max-k)*g2) / max;
+                *dest++ = (k*b1 + (max-k)*b2) / max;
+            }
+        }
+
+/*---------------------------------------------------------------------------
+    Radial "starburst" with azimuthal sinusoids; [eventually number of sinu-
+    soids will equal bgscale?].  This one is slow but very cool.  Code con-
+    tributed by Pieter S. van der Meulen (originally in Smalltalk).
+  ---------------------------------------------------------------------------*/
+
+    } else if ((bg[pat].type & 0x07) == 2) {
+        uch ch;
+        int ii, x, y, hw, hh, grayspot;
+        double freq, rotate, saturate, gray, intensity;
+        double angle=0.0, aoffset=0.0, maxDist, dist;
+        double red=0.0, green=0.0, blue=0.0, hue, s, v, f, p, q, t;
+
+        hh = (int)(rpng2_info.height / 2);
+        hw = (int)(rpng2_info.width / 2);
+
+        /* variables for radial waves:
+         *   aoffset:  number of degrees to rotate hue [CURRENTLY NOT USED]
+         *   freq:  number of color beams originating from the center
+         *   grayspot:  size of the graying center area (anti-alias)
+         *   rotate:  rotation of the beams as a function of radius
+         *   saturate:  saturation of beams' shape azimuthally
+         */
+        angle = CLIP(angle, 0.0, 360.0);
+        grayspot = CLIP(bg[pat].bg_gray, 1, (hh + hw));
+        freq = MAX((double)bg[pat].bg_freq, 0.0);
+        saturate = (double)bg[pat].bg_bsat * 0.1;
+        rotate = (double)bg[pat].bg_brot * 0.1;
+        gray = 0.0;
+        intensity = 0.0;
+        maxDist = (double)((hw*hw) + (hh*hh));
+
+        for (row = 0;  row < rpng2_info.height;  ++row) {
+            y = (int)(row - hh);
+            dest = (char *)bg_data + row*bg_rowbytes;
+            for (i = 0;  i < rpng2_info.width;  ++i) {
+                x = (int)(i - hw);
+                angle = (x == 0)? PI_2 : atan((double)y / (double)x);
+                gray = (double)MAX(ABS(y), ABS(x)) / grayspot;
+                gray = MIN(1.0, gray);
+                dist = (double)((x*x) + (y*y)) / maxDist;
+                intensity = cos((angle+(rotate*dist*PI)) * freq) *
+                  gray * saturate;
+                intensity = (MAX(MIN(intensity,1.0),-1.0) + 1.0) * 0.5;
+                hue = (angle + PI) * INV_PI_360 + aoffset;
+                s = gray * ((double)(ABS(x)+ABS(y)) / (double)(hw + hh));
+                s = MIN(MAX(s,0.0), 1.0);
+                v = MIN(MAX(intensity,0.0), 1.0);
+
+                if (s == 0.0) {
+                    ch = (uch)(v * 255.0);
+                    *dest++ = ch;
+                    *dest++ = ch;
+                    *dest++ = ch;
+                } else {
+                    if ((hue < 0.0) || (hue >= 360.0))
+                        hue -= (((int)(hue / 360.0)) * 360.0);
+                    hue /= 60.0;
+                    ii = (int)hue;
+                    f = hue - (double)ii;
+                    p = (1.0 - s) * v;
+                    q = (1.0 - (s * f)) * v;
+                    t = (1.0 - (s * (1.0 - f))) * v;
+                    if      (ii == 0) { red = v; green = t; blue = p; }
+                    else if (ii == 1) { red = q; green = v; blue = p; }
+                    else if (ii == 2) { red = p; green = v; blue = t; }
+                    else if (ii == 3) { red = p; green = q; blue = v; }
+                    else if (ii == 4) { red = t; green = p; blue = v; }
+                    else if (ii == 5) { red = v; green = p; blue = q; }
+                    *dest++ = (uch)(red * 255.0);
+                    *dest++ = (uch)(green * 255.0);
+                    *dest++ = (uch)(blue * 255.0);
+                }
+            }
+        }
+    }
+
+} /* end function rpng2_x_reload_bg_image() */
+
+
+
+
+
+static int is_number(char *p)
+{
+    while (*p) {
+        if (!isdigit(*p))
+            return FALSE;
+        ++p;
+    }
+    return TRUE;
+}
+
+#endif /* FEATURE_LOOP */
+
+
+
+
+
+static void rpng2_x_cleanup(void)
+{
+    if (bg_image && bg_data) {
+        free(bg_data);
+        bg_data = NULL;
+    }
+
+    if (rpng2_info.image_data) {
+        free(rpng2_info.image_data);
+        rpng2_info.image_data = NULL;
+    }
+
+    if (rpng2_info.row_pointers) {
+        free(rpng2_info.row_pointers);
+        rpng2_info.row_pointers = NULL;
+    }
+
+    if (ximage) {
+        if (ximage->data) {
+            free(ximage->data);           /* we allocated it, so we free it */
+            ximage->data = (char *)NULL;  /*  instead of XDestroyImage() */
+        }
+        XDestroyImage(ximage);
+        ximage = NULL;
+    }
+
+    if (have_gc)
+        XFreeGC(display, gc);
+
+    if (have_window)
+        XDestroyWindow(display, window);
+
+    if (have_colormap)
+        XFreeColormap(display, colormap);
+
+    if (have_nondefault_visual)
+        XFree(visual_list);
+}
+
+
+
+
+
+static int rpng2_x_msb(ulg u32val)
+{
+    int i;
+
+    for (i = 31;  i >= 0;  --i) {
+        if (u32val & 0x80000000L)
+            break;
+        u32val <<= 1;
+    }
+    return i;
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/wpng.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/wpng.c
index 30372a3..a06e352 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/wpng.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/wpng.c
@@ -1,853 +1,853 @@
-/*---------------------------------------------------------------------------

-

-   wpng - simple PNG-writing program                                 wpng.c

-

-   This program converts certain NetPBM binary files (grayscale and RGB,

-   maxval = 255) to PNG.  Non-interlaced PNGs are written progressively;

-   interlaced PNGs are read and written in one memory-intensive blast.

-

-   Thanks to Jean-loup Gailly for providing the necessary trick to read

-   interactive text from the keyboard while stdin is redirected.  Thanks

-   to Cosmin Truta for Cygwin fixes.

-

-   NOTE:  includes provisional support for PNM type "8" (portable alphamap)

-          images, presumed to be a 32-bit interleaved RGBA format; no pro-

-          vision for possible interleaved grayscale+alpha (16-bit) format.

-          THIS IS UNLIKELY TO BECOME AN OFFICIAL NETPBM ALPHA FORMAT!

-

-   to do:

-    - delete output file if quit before calling any writepng routines

-    - process backspace with -text option under DOS/Win? (currently get ^H)

-

-  ---------------------------------------------------------------------------

-

-   Changelog:

-    - 1.01:  initial public release

-    - 1.02:  modified to allow abbreviated options

-    - 1.03:  removed extraneous character from usage screen; fixed bug in

-              command-line parsing

-    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix

-              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)

-    - 2.00:  dual-licensed (added GNU GPL)

-

-        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line

-         dose not work!  In order to do something useful I needed to redirect

-         both input and output, with cygwin and with bcc32 as well.  Under

-         Linux, the same wpng appears to work fine.  I don't know what is

-         the problem."]

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#define PROGNAME  "wpng"

-#define VERSION   "2.00 of 2 June 2007"

-#define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"

-

-#if defined(__MSDOS__) || defined(__OS2__)

-#  define DOS_OS2_W32

-#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)

-#  ifndef __GNUC__   /* treat Win32 native ports of gcc as Unix environments */

-#    define DOS_OS2_W32

-#  endif

-#endif

-

-#include <stdio.h>

-#include <stdlib.h>

-#include <string.h>

-#include <setjmp.h>     /* for jmpbuf declaration in writepng.h */

-#include <time.h>

-

-#ifdef DOS_OS2_W32

-#  include <io.h>       /* for isatty(), setmode() prototypes */

-#  include <fcntl.h>    /* O_BINARY for fdopen() without text translation */

-#  ifdef __EMX__

-#    ifndef getch

-#      define getch() _read_kbd(0, 1, 0)    /* need getche() */

-#    endif

-#  else /* !__EMX__ */

-#    ifdef __GO32__

-#      include <pc.h>

-#      define getch() getkey()  /* GRR:  need getche() */

-#    else

-#      include <conio.h>        /* for getche() console input */

-#    endif

-#  endif /* ?__EMX__ */

-#  define FGETS(buf,len,stream)  dos_kbd_gets(buf,len)

-#else

-#  include <unistd.h>           /* for isatty() prototype */

-#  define FGETS fgets

-#endif

-

-/* #define DEBUG  :  this enables the Trace() macros */

-

-/* #define FORBID_LATIN1_CTRL  :  this requires the user to re-enter any

-   text that includes control characters discouraged by the PNG spec; text

-   that includes an escape character (27) must be re-entered regardless */

-

-#include "writepng.h"   /* typedefs, common macros, writepng prototypes */

-

-

-

-/* local prototypes */

-

-static int  wpng_isvalid_latin1(uch *p, int len);

-static void wpng_cleanup(void);

-

-#ifdef DOS_OS2_W32

-   static char *dos_kbd_gets(char *buf, int len);

-#endif

-

-

-

-static mainprog_info wpng_info;   /* lone global */

-

-

-

-int main(int argc, char **argv)

-{

-#ifndef DOS_OS2_W32

-    FILE *keybd;

-#endif

-#ifdef sgi

-    FILE *tmpfile;      /* or we could just use keybd, since no overlap */

-    char tmpline[80];

-#endif

-    char *inname = NULL, outname[256];

-    char *p, pnmchar, pnmline[256];

-    char *bgstr, *textbuf = NULL;

-    ulg rowbytes;

-    int rc, len = 0;

-    int error = 0;

-    int text = FALSE;

-    int maxval;

-    double LUT_exponent;                /* just the lookup table */

-    double CRT_exponent = 2.2;          /* just the monitor */

-    double default_display_exponent;    /* whole display system */

-    double default_gamma = 0.0;

-

-

-    wpng_info.infile = NULL;

-    wpng_info.outfile = NULL;

-    wpng_info.image_data = NULL;

-    wpng_info.row_pointers = NULL;

-    wpng_info.filter = FALSE;

-    wpng_info.interlaced = FALSE;

-    wpng_info.have_bg = FALSE;

-    wpng_info.have_time = FALSE;

-    wpng_info.have_text = 0;

-    wpng_info.gamma = 0.0;

-

-

-    /* First get the default value for our display-system exponent, i.e.,

-     * the product of the CRT exponent and the exponent corresponding to

-     * the frame-buffer's lookup table (LUT), if any.  If the PNM image

-     * looks correct on the user's display system, its file gamma is the

-     * inverse of this value.  (Note that this is not an exhaustive list

-     * of LUT values--e.g., OpenStep has a lot of weird ones--but it should

-     * cover 99% of the current possibilities.  This section must ensure

-     * that default_display_exponent is positive.) */

-

-#if defined(NeXT)

-    /* third-party utilities can modify the default LUT exponent */

-    LUT_exponent = 1.0 / 2.2;

-    /*

-    if (some_next_function_that_returns_gamma(&next_gamma))

-        LUT_exponent = 1.0 / next_gamma;

-     */

-#elif defined(sgi)

-    LUT_exponent = 1.0 / 1.7;

-    /* there doesn't seem to be any documented function to

-     * get the "gamma" value, so we do it the hard way */

-    tmpfile = fopen("/etc/config/system.glGammaVal", "r");

-    if (tmpfile) {

-        double sgi_gamma;

-

-        fgets(tmpline, 80, tmpfile);

-        fclose(tmpfile);

-        sgi_gamma = atof(tmpline);

-        if (sgi_gamma > 0.0)

-            LUT_exponent = 1.0 / sgi_gamma;

-    }

-#elif defined(Macintosh)

-    LUT_exponent = 1.8 / 2.61;

-    /*

-    if (some_mac_function_that_returns_gamma(&mac_gamma))

-        LUT_exponent = mac_gamma / 2.61;

-     */

-#else

-    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */

-#endif

-

-    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */

-    default_display_exponent = LUT_exponent * CRT_exponent;

-

-

-    /* If the user has set the SCREEN_GAMMA environment variable as suggested

-     * (somewhat imprecisely) in the libpng documentation, use that; otherwise

-     * use the default value we just calculated.  Either way, the user may

-     * override this via a command-line option. */

-

-    if ((p = getenv("SCREEN_GAMMA")) != NULL) {

-        double exponent = atof(p);

-

-        if (exponent > 0.0)

-            default_gamma = 1.0 / exponent;

-    }

-

-    if (default_gamma == 0.0)

-        default_gamma = 1.0 / default_display_exponent;

-

-

-    /* Now parse the command line for options and the PNM filename. */

-

-    while (*++argv && !error) {

-        if (!strncmp(*argv, "-i", 2)) {

-            wpng_info.interlaced = TRUE;

-        } else if (!strncmp(*argv, "-time", 3)) {

-            wpng_info.modtime = time(NULL);

-            wpng_info.have_time = TRUE;

-        } else if (!strncmp(*argv, "-text", 3)) {

-            text = TRUE;

-        } else if (!strncmp(*argv, "-gamma", 2)) {

-            if (!*++argv)

-                ++error;

-            else {

-                wpng_info.gamma = atof(*argv);

-                if (wpng_info.gamma <= 0.0)

-                    ++error;

-                else if (wpng_info.gamma > 1.01)

-                    fprintf(stderr, PROGNAME

-                      " warning:  file gammas are usually less than 1.0\n");

-            }

-        } else if (!strncmp(*argv, "-bgcolor", 4)) {

-            if (!*++argv)

-                ++error;

-            else {

-                bgstr = *argv;

-                if (strlen(bgstr) != 7 || bgstr[0] != '#')

-                    ++error;

-                else {

-                    unsigned r, g, b;  /* this way quiets compiler warnings */

-

-                    sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);

-                    wpng_info.bg_red   = (uch)r;

-                    wpng_info.bg_green = (uch)g;

-                    wpng_info.bg_blue  = (uch)b;

-                    wpng_info.have_bg = TRUE;

-                }

-            }

-        } else {

-            if (**argv != '-') {

-                inname = *argv;

-                if (argv[1])   /* shouldn't be any more args after filename */

-                    ++error;

-            } else

-                ++error;   /* not expecting any other options */

-        }

-    }

-

-

-    /* open the input and output files, or register an error and abort */

-

-    if (!inname) {

-        if (isatty(0)) {

-            fprintf(stderr, PROGNAME

-              ":  must give input filename or provide image data via stdin\n");

-            ++error;

-        } else {

-#ifdef DOS_OS2_W32

-            /* some buggy C libraries require BOTH setmode() and fdopen(bin) */

-            setmode(fileno(stdin), O_BINARY);

-            setmode(fileno(stdout), O_BINARY);

-#endif

-            if ((wpng_info.infile = fdopen(fileno(stdin), "rb")) == NULL) {

-                fprintf(stderr, PROGNAME

-                  ":  unable to reopen stdin in binary mode\n");

-                ++error;

-            } else

-            if ((wpng_info.outfile = fdopen(fileno(stdout), "wb")) == NULL) {

-                fprintf(stderr, PROGNAME

-                  ":  unable to reopen stdout in binary mode\n");

-                fclose(wpng_info.infile);

-                ++error;

-            } else

-                wpng_info.filter = TRUE;

-        }

-    } else if ((len = strlen(inname)) > 250) {

-        fprintf(stderr, PROGNAME ":  input filename is too long [%d chars]\n",

-          len);

-        ++error;

-    } else if (!(wpng_info.infile = fopen(inname, "rb"))) {

-        fprintf(stderr, PROGNAME ":  can't open input file [%s]\n", inname);

-        ++error;

-    }

-

-    if (!error) {

-        fgets(pnmline, 256, wpng_info.infile);

-        if (pnmline[0] != 'P' || ((pnmchar = pnmline[1]) != '5' &&

-            pnmchar != '6' && pnmchar != '8'))

-        {

-            fprintf(stderr, PROGNAME

-              ":  input file [%s] is not a binary PGM, PPM or PAM file\n",

-              inname);

-            ++error;

-        } else {

-            wpng_info.pnmtype = (int)(pnmchar - '0');

-            if (wpng_info.pnmtype != 8)

-                wpng_info.have_bg = FALSE;  /* no need for bg if opaque */

-            do {

-                fgets(pnmline, 256, wpng_info.infile);  /* lose any comments */

-            } while (pnmline[0] == '#');

-            sscanf(pnmline, "%ld %ld", &wpng_info.width, &wpng_info.height);

-            do {

-                fgets(pnmline, 256, wpng_info.infile);  /* more comment lines */

-            } while (pnmline[0] == '#');

-            sscanf(pnmline, "%d", &maxval);

-            if (wpng_info.width <= 0L || wpng_info.height <= 0L ||

-                maxval != 255)

-            {

-                fprintf(stderr, PROGNAME

-                  ":  only positive width/height, maxval == 255 allowed \n");

-                ++error;

-            }

-            wpng_info.sample_depth = 8;  /* <==> maxval 255 */

-

-            if (!wpng_info.filter) {

-                /* make outname from inname */

-                if ((p = strrchr(inname, '.')) == NULL ||

-                    (p - inname) != (len - 4))

-                {

-                    strcpy(outname, inname);

-                    strcpy(outname+len, ".png");

-                } else {

-                    len -= 4;

-                    strncpy(outname, inname, len);

-                    strcpy(outname+len, ".png");

-                }

-                /* check if outname already exists; if not, open */

-                if ((wpng_info.outfile = fopen(outname, "rb")) != NULL) {

-                    fprintf(stderr, PROGNAME ":  output file exists [%s]\n",

-                      outname);

-                    fclose(wpng_info.outfile);

-                    ++error;

-                } else if (!(wpng_info.outfile = fopen(outname, "wb"))) {

-                    fprintf(stderr, PROGNAME ":  can't open output file [%s]\n",

-                      outname);

-                    ++error;

-                }

-            }

-        }

-        if (error) {

-            fclose(wpng_info.infile);

-            wpng_info.infile = NULL;

-            if (wpng_info.filter) {

-                fclose(wpng_info.outfile);

-                wpng_info.outfile = NULL;

-            }

-        }

-    }

-

-

-    /* if we had any errors, print usage and die horrible death...arrr! */

-

-    if (error) {

-        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, APPNAME);

-        writepng_version_info();

-        fprintf(stderr, "\n"

-"Usage:  %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n"

-"or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n"

-         "    exp \ttransfer-function exponent (``gamma'') of the image in\n"

-         "\t\t  floating-point format (e.g., ``%.5f''); if image looks\n"

-         "\t\t  correct on given display system, image gamma is equal to\n"

-         "\t\t  inverse of display-system exponent, i.e., 1 / (LUT * CRT)\n"

-         "\t\t  (where LUT = lookup-table exponent and CRT = CRT exponent;\n"

-         "\t\t  first varies, second is usually 2.2, all are positive)\n"

-         "    bg  \tdesired background color for alpha-channel images, in\n"

-         "\t\t  7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"

-         "\t\t  same as HTML colors)\n"

-         "    -text\tprompt interactively for text info (tEXt chunks)\n"

-         "    -time\tinclude a tIME chunk (last modification time)\n"

-         "    -interlace\twrite interlaced PNG image\n"

-         "\n"

-"pnmfile or stdin must be a binary PGM (`P5'), PPM (`P6') or (extremely\n"

-"unofficial and unsupported!) PAM (`P8') file.  Currently it is required\n"

-"to have maxval == 255 (i.e., no scaling).  If pnmfile is specified, it\n"

-"is converted to the corresponding PNG file with the same base name but a\n"

-"``.png'' extension; files read from stdin are converted and sent to stdout.\n"

-"The conversion is progressive (low memory usage) unless interlacing is\n"

-"requested; in that case the whole image will be buffered in memory and\n"

-"written in one call.\n"

-         "\n", PROGNAME, PROGNAME, default_gamma);

-        exit(1);

-    }

-

-

-    /* prepare the text buffers for libpng's use; note that even though

-     * PNG's png_text struct includes a length field, we don't have to fill

-     * it out */

-

-    if (text &&

-#ifndef DOS_OS2_W32

-        (keybd = fdopen(fileno(stderr), "r")) != NULL &&

-#endif

-        (textbuf = (char *)malloc((5 + 9)*75)) != NULL)

-    {

-        int i, valid, result;

-

-        fprintf(stderr,

-          "Enter text info (no more than 72 characters per line);\n");

-        fprintf(stderr, "to skip a field, hit the <Enter> key.\n");

-        /* note:  just <Enter> leaves len == 1 */

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_TITLE_OFFSET;

-            fprintf(stderr, "  Title: ");

-            fflush(stderr);

-            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {

-                if (p[len-1] == '\n')

-                    p[--len] = '\0';

-                wpng_info.title = p;

-                wpng_info.have_text |= TEXT_TITLE;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_TITLE;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_TITLE;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_AUTHOR_OFFSET;

-            fprintf(stderr, "  Author: ");

-            fflush(stderr);

-            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {

-                if (p[len-1] == '\n')

-                    p[--len] = '\0';

-                wpng_info.author = p;

-                wpng_info.have_text |= TEXT_AUTHOR;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_AUTHOR;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_AUTHOR;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_DESC_OFFSET;

-            fprintf(stderr, "  Description (up to 9 lines):\n");

-            for (i = 1;  i < 10;  ++i) {

-                fprintf(stderr, "    [%d] ", i);

-                fflush(stderr);

-                if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1)

-                    p += len;   /* now points at NULL; char before is newline */

-                else

-                    break;

-            }

-            if ((len = p - (textbuf + TEXT_DESC_OFFSET)) > 1) {

-                if (p[-1] == '\n') {

-                    p[-1] = '\0';

-                    --len;

-                }

-                wpng_info.desc = textbuf + TEXT_DESC_OFFSET;

-                wpng_info.have_text |= TEXT_DESC;

-                p = textbuf + TEXT_DESC_OFFSET;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_DESC;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_DESC;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_COPY_OFFSET;

-            fprintf(stderr, "  Copyright: ");

-            fflush(stderr);

-            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {

-                if (p[len-1] == '\n')

-                    p[--len] = '\0';

-                wpng_info.copyright = p;

-                wpng_info.have_text |= TEXT_COPY;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_COPY;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_COPY;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_EMAIL_OFFSET;

-            fprintf(stderr, "  E-mail: ");

-            fflush(stderr);

-            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {

-                if (p[len-1] == '\n')

-                    p[--len] = '\0';

-                wpng_info.email = p;

-                wpng_info.have_text |= TEXT_EMAIL;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_EMAIL;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_EMAIL;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-        do {

-            valid = TRUE;

-            p = textbuf + TEXT_URL_OFFSET;

-            fprintf(stderr, "  URL: ");

-            fflush(stderr);

-            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {

-                if (p[len-1] == '\n')

-                    p[--len] = '\0';

-                wpng_info.url = p;

-                wpng_info.have_text |= TEXT_URL;

-                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {

-                    fprintf(stderr, "    " PROGNAME " warning:  character code"

-                      " %u is %sdiscouraged by the PNG\n    specification "

-                      "[first occurrence was at character position #%d]\n",

-                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",

-                      result+1);

-                    fflush(stderr);

-#ifdef FORBID_LATIN1_CTRL

-                    wpng_info.have_text &= ~TEXT_URL;

-                    valid = FALSE;

-#else

-                    if (p[result] == 27) {    /* escape character */

-                        wpng_info.have_text &= ~TEXT_URL;

-                        valid = FALSE;

-                    }

-#endif

-                }

-            }

-        } while (!valid);

-

-#ifndef DOS_OS2_W32

-        fclose(keybd);

-#endif

-

-    } else if (text) {

-        fprintf(stderr, PROGNAME ":  unable to allocate memory for text\n");

-        text = FALSE;

-        wpng_info.have_text = 0;

-    }

-

-

-    /* allocate libpng stuff, initialize transformations, write pre-IDAT data */

-

-    if ((rc = writepng_init(&wpng_info)) != 0) {

-        switch (rc) {

-            case 2:

-                fprintf(stderr, PROGNAME

-                  ":  libpng initialization problem (longjmp)\n");

-                break;

-            case 4:

-                fprintf(stderr, PROGNAME ":  insufficient memory\n");

-                break;

-            case 11:

-                fprintf(stderr, PROGNAME

-                  ":  internal logic error (unexpected PNM type)\n");

-                break;

-            default:

-                fprintf(stderr, PROGNAME

-                  ":  unknown writepng_init() error\n");

-                break;

-        }

-        exit(rc);

-    }

-

-

-    /* free textbuf, since it's a completely local variable and all text info

-     * has just been written to the PNG file */

-

-    if (text && textbuf) {

-        free(textbuf);

-        textbuf = NULL;

-    }

-

-

-    /* calculate rowbytes on basis of image type; note that this becomes much

-     * more complicated if we choose to support PBM type, ASCII PNM types, or

-     * 16-bit-per-sample binary data [currently not an official NetPBM type] */

-

-    if (wpng_info.pnmtype == 5)

-        rowbytes = wpng_info.width;

-    else if (wpng_info.pnmtype == 6)

-        rowbytes = wpng_info.width * 3;

-    else /* if (wpng_info.pnmtype == 8) */

-        rowbytes = wpng_info.width * 4;

-

-

-    /* read and write the image, either in its entirety (if writing interlaced

-     * PNG) or row by row (if non-interlaced) */

-

-    fprintf(stderr, "Encoding image data...\n");

-    fflush(stderr);

-

-    if (wpng_info.interlaced) {

-        long i;

-        ulg bytes;

-        ulg image_bytes = rowbytes * wpng_info.height;   /* overflow? */

-

-        wpng_info.image_data = (uch *)malloc(image_bytes);

-        wpng_info.row_pointers = (uch **)malloc(wpng_info.height*sizeof(uch *));

-        if (wpng_info.image_data == NULL || wpng_info.row_pointers == NULL) {

-            fprintf(stderr, PROGNAME ":  insufficient memory for image data\n");

-            writepng_cleanup(&wpng_info);

-            wpng_cleanup();

-            exit(5);

-        }

-        for (i = 0;  i < wpng_info.height;  ++i)

-            wpng_info.row_pointers[i] = wpng_info.image_data + i*rowbytes;

-        bytes = fread(wpng_info.image_data, 1, image_bytes, wpng_info.infile);

-        if (bytes != image_bytes) {

-            fprintf(stderr, PROGNAME ":  expected %lu bytes, got %lu bytes\n",

-              image_bytes, bytes);

-            fprintf(stderr, "  (continuing anyway)\n");

-        }

-        if (writepng_encode_image(&wpng_info) != 0) {

-            fprintf(stderr, PROGNAME

-              ":  libpng problem (longjmp) while writing image data\n");

-            writepng_cleanup(&wpng_info);

-            wpng_cleanup();

-            exit(2);

-        }

-

-    } else /* not interlaced:  write progressively (row by row) */ {

-        long j;

-        ulg bytes;

-

-        wpng_info.image_data = (uch *)malloc(rowbytes);

-        if (wpng_info.image_data == NULL) {

-            fprintf(stderr, PROGNAME ":  insufficient memory for row data\n");

-            writepng_cleanup(&wpng_info);

-            wpng_cleanup();

-            exit(5);

-        }

-        error = 0;

-        for (j = wpng_info.height;  j > 0L;  --j) {

-            bytes = fread(wpng_info.image_data, 1, rowbytes, wpng_info.infile);

-            if (bytes != rowbytes) {

-                fprintf(stderr, PROGNAME

-                  ":  expected %lu bytes, got %lu bytes (row %ld)\n", rowbytes,

-                  bytes, wpng_info.height-j);

-                ++error;

-                break;

-            }

-            if (writepng_encode_row(&wpng_info) != 0) {

-                fprintf(stderr, PROGNAME

-                  ":  libpng problem (longjmp) while writing row %ld\n",

-                  wpng_info.height-j);

-                ++error;

-                break;

-            }

-        }

-        if (error) {

-            writepng_cleanup(&wpng_info);

-            wpng_cleanup();

-            exit(2);

-        }

-        if (writepng_encode_finish(&wpng_info) != 0) {

-            fprintf(stderr, PROGNAME ":  error on final libpng call\n");

-            writepng_cleanup(&wpng_info);

-            wpng_cleanup();

-            exit(2);

-        }

-    }

-

-

-    /* OK, we're done (successfully):  clean up all resources and quit */

-

-    fprintf(stderr, "Done.\n");

-    fflush(stderr);

-

-    writepng_cleanup(&wpng_info);

-    wpng_cleanup();

-

-    return 0;

-}

-

-

-

-

-

-static int wpng_isvalid_latin1(uch *p, int len)

-{

-    int i, result = -1;

-

-    for (i = 0;  i < len;  ++i) {

-        if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160)

-            continue;           /* character is completely OK */

-        if (result < 0 || (p[result] != 27 && p[i] == 27))

-            result = i;         /* mark location of first questionable one */

-    }                           /*  or of first escape character (bad) */

-

-    return result;

-}

-

-

-

-

-

-static void wpng_cleanup(void)

-{

-    if (wpng_info.outfile) {

-        fclose(wpng_info.outfile);

-        wpng_info.outfile = NULL;

-    }

-

-    if (wpng_info.infile) {

-        fclose(wpng_info.infile);

-        wpng_info.infile = NULL;

-    }

-

-    if (wpng_info.image_data) {

-        free(wpng_info.image_data);

-        wpng_info.image_data = NULL;

-    }

-

-    if (wpng_info.row_pointers) {

-        free(wpng_info.row_pointers);

-        wpng_info.row_pointers = NULL;

-    }

-}

-

-

-

-

-#ifdef DOS_OS2_W32

-

-static char *dos_kbd_gets(char *buf, int len)

-{

-    int ch, count=0;

-

-    do {

-        buf[count++] = ch = getche();

-    } while (ch != '\r' && count < len-1);

-

-    buf[count--] = '\0';        /* terminate string */

-    if (buf[count] == '\r')     /* Enter key makes CR, so change to newline */

-        buf[count] = '\n';

-

-    fprintf(stderr, "\n");      /* Enter key does *not* cause a newline */

-    fflush(stderr);

-

-    return buf;

-}

-

-#endif /* DOS_OS2_W32 */

+/*---------------------------------------------------------------------------
+
+   wpng - simple PNG-writing program                                 wpng.c
+
+   This program converts certain NetPBM binary files (grayscale and RGB,
+   maxval = 255) to PNG.  Non-interlaced PNGs are written progressively;
+   interlaced PNGs are read and written in one memory-intensive blast.
+
+   Thanks to Jean-loup Gailly for providing the necessary trick to read
+   interactive text from the keyboard while stdin is redirected.  Thanks
+   to Cosmin Truta for Cygwin fixes.
+
+   NOTE:  includes provisional support for PNM type "8" (portable alphamap)
+          images, presumed to be a 32-bit interleaved RGBA format; no pro-
+          vision for possible interleaved grayscale+alpha (16-bit) format.
+          THIS IS UNLIKELY TO BECOME AN OFFICIAL NETPBM ALPHA FORMAT!
+
+   to do:
+    - delete output file if quit before calling any writepng routines
+    - process backspace with -text option under DOS/Win? (currently get ^H)
+
+  ---------------------------------------------------------------------------
+
+   Changelog:
+    - 1.01:  initial public release
+    - 1.02:  modified to allow abbreviated options
+    - 1.03:  removed extraneous character from usage screen; fixed bug in
+              command-line parsing
+    - 1.04:  fixed DOS/OS2/Win32 detection, including partial Cygwin fix
+              (see http://home.att.net/~perlspinr/diffs/GregBook_cygwin.diff)
+    - 2.00:  dual-licensed (added GNU GPL)
+
+        [REPORTED BUG (win32 only):  "contrib/gregbook/wpng.c - cmd line
+         dose not work!  In order to do something useful I needed to redirect
+         both input and output, with cygwin and with bcc32 as well.  Under
+         Linux, the same wpng appears to work fine.  I don't know what is
+         the problem."]
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#define PROGNAME  "wpng"
+#define VERSION   "2.00 of 2 June 2007"
+#define APPNAME   "Simple PGM/PPM/PAM to PNG Converter"
+
+#if defined(__MSDOS__) || defined(__OS2__)
+#  define DOS_OS2_W32
+#elif defined(WIN32) || defined(_WIN32) || defined(__WIN32__)
+#  ifndef __GNUC__   /* treat Win32 native ports of gcc as Unix environments */
+#    define DOS_OS2_W32
+#  endif
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>     /* for jmpbuf declaration in writepng.h */
+#include <time.h>
+
+#ifdef DOS_OS2_W32
+#  include <io.h>       /* for isatty(), setmode() prototypes */
+#  include <fcntl.h>    /* O_BINARY for fdopen() without text translation */
+#  ifdef __EMX__
+#    ifndef getch
+#      define getch() _read_kbd(0, 1, 0)    /* need getche() */
+#    endif
+#  else /* !__EMX__ */
+#    ifdef __GO32__
+#      include <pc.h>
+#      define getch() getkey()  /* GRR:  need getche() */
+#    else
+#      include <conio.h>        /* for getche() console input */
+#    endif
+#  endif /* ?__EMX__ */
+#  define FGETS(buf,len,stream)  dos_kbd_gets(buf,len)
+#else
+#  include <unistd.h>           /* for isatty() prototype */
+#  define FGETS fgets
+#endif
+
+/* #define DEBUG  :  this enables the Trace() macros */
+
+/* #define FORBID_LATIN1_CTRL  :  this requires the user to re-enter any
+   text that includes control characters discouraged by the PNG spec; text
+   that includes an escape character (27) must be re-entered regardless */
+
+#include "writepng.h"   /* typedefs, common macros, writepng prototypes */
+
+
+
+/* local prototypes */
+
+static int  wpng_isvalid_latin1(uch *p, int len);
+static void wpng_cleanup(void);
+
+#ifdef DOS_OS2_W32
+   static char *dos_kbd_gets(char *buf, int len);
+#endif
+
+
+
+static mainprog_info wpng_info;   /* lone global */
+
+
+
+int main(int argc, char **argv)
+{
+#ifndef DOS_OS2_W32
+    FILE *keybd;
+#endif
+#ifdef sgi
+    FILE *tmpfile;      /* or we could just use keybd, since no overlap */
+    char tmpline[80];
+#endif
+    char *inname = NULL, outname[256];
+    char *p, pnmchar, pnmline[256];
+    char *bgstr, *textbuf = NULL;
+    ulg rowbytes;
+    int rc, len = 0;
+    int error = 0;
+    int text = FALSE;
+    int maxval;
+    double LUT_exponent;                /* just the lookup table */
+    double CRT_exponent = 2.2;          /* just the monitor */
+    double default_display_exponent;    /* whole display system */
+    double default_gamma = 0.0;
+
+
+    wpng_info.infile = NULL;
+    wpng_info.outfile = NULL;
+    wpng_info.image_data = NULL;
+    wpng_info.row_pointers = NULL;
+    wpng_info.filter = FALSE;
+    wpng_info.interlaced = FALSE;
+    wpng_info.have_bg = FALSE;
+    wpng_info.have_time = FALSE;
+    wpng_info.have_text = 0;
+    wpng_info.gamma = 0.0;
+
+
+    /* First get the default value for our display-system exponent, i.e.,
+     * the product of the CRT exponent and the exponent corresponding to
+     * the frame-buffer's lookup table (LUT), if any.  If the PNM image
+     * looks correct on the user's display system, its file gamma is the
+     * inverse of this value.  (Note that this is not an exhaustive list
+     * of LUT values--e.g., OpenStep has a lot of weird ones--but it should
+     * cover 99% of the current possibilities.  This section must ensure
+     * that default_display_exponent is positive.) */
+
+#if defined(NeXT)
+    /* third-party utilities can modify the default LUT exponent */
+    LUT_exponent = 1.0 / 2.2;
+    /*
+    if (some_next_function_that_returns_gamma(&next_gamma))
+        LUT_exponent = 1.0 / next_gamma;
+     */
+#elif defined(sgi)
+    LUT_exponent = 1.0 / 1.7;
+    /* there doesn't seem to be any documented function to
+     * get the "gamma" value, so we do it the hard way */
+    tmpfile = fopen("/etc/config/system.glGammaVal", "r");
+    if (tmpfile) {
+        double sgi_gamma;
+
+        fgets(tmpline, 80, tmpfile);
+        fclose(tmpfile);
+        sgi_gamma = atof(tmpline);
+        if (sgi_gamma > 0.0)
+            LUT_exponent = 1.0 / sgi_gamma;
+    }
+#elif defined(Macintosh)
+    LUT_exponent = 1.8 / 2.61;
+    /*
+    if (some_mac_function_that_returns_gamma(&mac_gamma))
+        LUT_exponent = mac_gamma / 2.61;
+     */
+#else
+    LUT_exponent = 1.0;   /* assume no LUT:  most PCs */
+#endif
+
+    /* the defaults above give 1.0, 1.3, 1.5 and 2.2, respectively: */
+    default_display_exponent = LUT_exponent * CRT_exponent;
+
+
+    /* If the user has set the SCREEN_GAMMA environment variable as suggested
+     * (somewhat imprecisely) in the libpng documentation, use that; otherwise
+     * use the default value we just calculated.  Either way, the user may
+     * override this via a command-line option. */
+
+    if ((p = getenv("SCREEN_GAMMA")) != NULL) {
+        double exponent = atof(p);
+
+        if (exponent > 0.0)
+            default_gamma = 1.0 / exponent;
+    }
+
+    if (default_gamma == 0.0)
+        default_gamma = 1.0 / default_display_exponent;
+
+
+    /* Now parse the command line for options and the PNM filename. */
+
+    while (*++argv && !error) {
+        if (!strncmp(*argv, "-i", 2)) {
+            wpng_info.interlaced = TRUE;
+        } else if (!strncmp(*argv, "-time", 3)) {
+            wpng_info.modtime = time(NULL);
+            wpng_info.have_time = TRUE;
+        } else if (!strncmp(*argv, "-text", 3)) {
+            text = TRUE;
+        } else if (!strncmp(*argv, "-gamma", 2)) {
+            if (!*++argv)
+                ++error;
+            else {
+                wpng_info.gamma = atof(*argv);
+                if (wpng_info.gamma <= 0.0)
+                    ++error;
+                else if (wpng_info.gamma > 1.01)
+                    fprintf(stderr, PROGNAME
+                      " warning:  file gammas are usually less than 1.0\n");
+            }
+        } else if (!strncmp(*argv, "-bgcolor", 4)) {
+            if (!*++argv)
+                ++error;
+            else {
+                bgstr = *argv;
+                if (strlen(bgstr) != 7 || bgstr[0] != '#')
+                    ++error;
+                else {
+                    unsigned r, g, b;  /* this way quiets compiler warnings */
+
+                    sscanf(bgstr+1, "%2x%2x%2x", &r, &g, &b);
+                    wpng_info.bg_red   = (uch)r;
+                    wpng_info.bg_green = (uch)g;
+                    wpng_info.bg_blue  = (uch)b;
+                    wpng_info.have_bg = TRUE;
+                }
+            }
+        } else {
+            if (**argv != '-') {
+                inname = *argv;
+                if (argv[1])   /* shouldn't be any more args after filename */
+                    ++error;
+            } else
+                ++error;   /* not expecting any other options */
+        }
+    }
+
+
+    /* open the input and output files, or register an error and abort */
+
+    if (!inname) {
+        if (isatty(0)) {
+            fprintf(stderr, PROGNAME
+              ":  must give input filename or provide image data via stdin\n");
+            ++error;
+        } else {
+#ifdef DOS_OS2_W32
+            /* some buggy C libraries require BOTH setmode() and fdopen(bin) */
+            setmode(fileno(stdin), O_BINARY);
+            setmode(fileno(stdout), O_BINARY);
+#endif
+            if ((wpng_info.infile = fdopen(fileno(stdin), "rb")) == NULL) {
+                fprintf(stderr, PROGNAME
+                  ":  unable to reopen stdin in binary mode\n");
+                ++error;
+            } else
+            if ((wpng_info.outfile = fdopen(fileno(stdout), "wb")) == NULL) {
+                fprintf(stderr, PROGNAME
+                  ":  unable to reopen stdout in binary mode\n");
+                fclose(wpng_info.infile);
+                ++error;
+            } else
+                wpng_info.filter = TRUE;
+        }
+    } else if ((len = strlen(inname)) > 250) {
+        fprintf(stderr, PROGNAME ":  input filename is too long [%d chars]\n",
+          len);
+        ++error;
+    } else if (!(wpng_info.infile = fopen(inname, "rb"))) {
+        fprintf(stderr, PROGNAME ":  can't open input file [%s]\n", inname);
+        ++error;
+    }
+
+    if (!error) {
+        fgets(pnmline, 256, wpng_info.infile);
+        if (pnmline[0] != 'P' || ((pnmchar = pnmline[1]) != '5' &&
+            pnmchar != '6' && pnmchar != '8'))
+        {
+            fprintf(stderr, PROGNAME
+              ":  input file [%s] is not a binary PGM, PPM or PAM file\n",
+              inname);
+            ++error;
+        } else {
+            wpng_info.pnmtype = (int)(pnmchar - '0');
+            if (wpng_info.pnmtype != 8)
+                wpng_info.have_bg = FALSE;  /* no need for bg if opaque */
+            do {
+                fgets(pnmline, 256, wpng_info.infile);  /* lose any comments */
+            } while (pnmline[0] == '#');
+            sscanf(pnmline, "%ld %ld", &wpng_info.width, &wpng_info.height);
+            do {
+                fgets(pnmline, 256, wpng_info.infile);  /* more comment lines */
+            } while (pnmline[0] == '#');
+            sscanf(pnmline, "%d", &maxval);
+            if (wpng_info.width <= 0L || wpng_info.height <= 0L ||
+                maxval != 255)
+            {
+                fprintf(stderr, PROGNAME
+                  ":  only positive width/height, maxval == 255 allowed \n");
+                ++error;
+            }
+            wpng_info.sample_depth = 8;  /* <==> maxval 255 */
+
+            if (!wpng_info.filter) {
+                /* make outname from inname */
+                if ((p = strrchr(inname, '.')) == NULL ||
+                    (p - inname) != (len - 4))
+                {
+                    strcpy(outname, inname);
+                    strcpy(outname+len, ".png");
+                } else {
+                    len -= 4;
+                    strncpy(outname, inname, len);
+                    strcpy(outname+len, ".png");
+                }
+                /* check if outname already exists; if not, open */
+                if ((wpng_info.outfile = fopen(outname, "rb")) != NULL) {
+                    fprintf(stderr, PROGNAME ":  output file exists [%s]\n",
+                      outname);
+                    fclose(wpng_info.outfile);
+                    ++error;
+                } else if (!(wpng_info.outfile = fopen(outname, "wb"))) {
+                    fprintf(stderr, PROGNAME ":  can't open output file [%s]\n",
+                      outname);
+                    ++error;
+                }
+            }
+        }
+        if (error) {
+            fclose(wpng_info.infile);
+            wpng_info.infile = NULL;
+            if (wpng_info.filter) {
+                fclose(wpng_info.outfile);
+                wpng_info.outfile = NULL;
+            }
+        }
+    }
+
+
+    /* if we had any errors, print usage and die horrible death...arrr! */
+
+    if (error) {
+        fprintf(stderr, "\n%s %s:  %s\n", PROGNAME, VERSION, APPNAME);
+        writepng_version_info();
+        fprintf(stderr, "\n"
+"Usage:  %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] pnmfile\n"
+"or: ... | %s [-gamma exp] [-bgcolor bg] [-text] [-time] [-interlace] | ...\n"
+         "    exp \ttransfer-function exponent (``gamma'') of the image in\n"
+         "\t\t  floating-point format (e.g., ``%.5f''); if image looks\n"
+         "\t\t  correct on given display system, image gamma is equal to\n"
+         "\t\t  inverse of display-system exponent, i.e., 1 / (LUT * CRT)\n"
+         "\t\t  (where LUT = lookup-table exponent and CRT = CRT exponent;\n"
+         "\t\t  first varies, second is usually 2.2, all are positive)\n"
+         "    bg  \tdesired background color for alpha-channel images, in\n"
+         "\t\t  7-character hex RGB format (e.g., ``#ff7700'' for orange:\n"
+         "\t\t  same as HTML colors)\n"
+         "    -text\tprompt interactively for text info (tEXt chunks)\n"
+         "    -time\tinclude a tIME chunk (last modification time)\n"
+         "    -interlace\twrite interlaced PNG image\n"
+         "\n"
+"pnmfile or stdin must be a binary PGM (`P5'), PPM (`P6') or (extremely\n"
+"unofficial and unsupported!) PAM (`P8') file.  Currently it is required\n"
+"to have maxval == 255 (i.e., no scaling).  If pnmfile is specified, it\n"
+"is converted to the corresponding PNG file with the same base name but a\n"
+"``.png'' extension; files read from stdin are converted and sent to stdout.\n"
+"The conversion is progressive (low memory usage) unless interlacing is\n"
+"requested; in that case the whole image will be buffered in memory and\n"
+"written in one call.\n"
+         "\n", PROGNAME, PROGNAME, default_gamma);
+        exit(1);
+    }
+
+
+    /* prepare the text buffers for libpng's use; note that even though
+     * PNG's png_text struct includes a length field, we don't have to fill
+     * it out */
+
+    if (text &&
+#ifndef DOS_OS2_W32
+        (keybd = fdopen(fileno(stderr), "r")) != NULL &&
+#endif
+        (textbuf = (char *)malloc((5 + 9)*75)) != NULL)
+    {
+        int i, valid, result;
+
+        fprintf(stderr,
+          "Enter text info (no more than 72 characters per line);\n");
+        fprintf(stderr, "to skip a field, hit the <Enter> key.\n");
+        /* note:  just <Enter> leaves len == 1 */
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_TITLE_OFFSET;
+            fprintf(stderr, "  Title: ");
+            fflush(stderr);
+            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
+                if (p[len-1] == '\n')
+                    p[--len] = '\0';
+                wpng_info.title = p;
+                wpng_info.have_text |= TEXT_TITLE;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_TITLE;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_TITLE;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_AUTHOR_OFFSET;
+            fprintf(stderr, "  Author: ");
+            fflush(stderr);
+            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
+                if (p[len-1] == '\n')
+                    p[--len] = '\0';
+                wpng_info.author = p;
+                wpng_info.have_text |= TEXT_AUTHOR;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_AUTHOR;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_AUTHOR;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_DESC_OFFSET;
+            fprintf(stderr, "  Description (up to 9 lines):\n");
+            for (i = 1;  i < 10;  ++i) {
+                fprintf(stderr, "    [%d] ", i);
+                fflush(stderr);
+                if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1)
+                    p += len;   /* now points at NULL; char before is newline */
+                else
+                    break;
+            }
+            if ((len = p - (textbuf + TEXT_DESC_OFFSET)) > 1) {
+                if (p[-1] == '\n') {
+                    p[-1] = '\0';
+                    --len;
+                }
+                wpng_info.desc = textbuf + TEXT_DESC_OFFSET;
+                wpng_info.have_text |= TEXT_DESC;
+                p = textbuf + TEXT_DESC_OFFSET;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_DESC;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_DESC;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_COPY_OFFSET;
+            fprintf(stderr, "  Copyright: ");
+            fflush(stderr);
+            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
+                if (p[len-1] == '\n')
+                    p[--len] = '\0';
+                wpng_info.copyright = p;
+                wpng_info.have_text |= TEXT_COPY;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_COPY;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_COPY;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_EMAIL_OFFSET;
+            fprintf(stderr, "  E-mail: ");
+            fflush(stderr);
+            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
+                if (p[len-1] == '\n')
+                    p[--len] = '\0';
+                wpng_info.email = p;
+                wpng_info.have_text |= TEXT_EMAIL;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_EMAIL;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_EMAIL;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+        do {
+            valid = TRUE;
+            p = textbuf + TEXT_URL_OFFSET;
+            fprintf(stderr, "  URL: ");
+            fflush(stderr);
+            if (FGETS(p, 74, keybd) && (len = strlen(p)) > 1) {
+                if (p[len-1] == '\n')
+                    p[--len] = '\0';
+                wpng_info.url = p;
+                wpng_info.have_text |= TEXT_URL;
+                if ((result = wpng_isvalid_latin1((uch *)p, len)) >= 0) {
+                    fprintf(stderr, "    " PROGNAME " warning:  character code"
+                      " %u is %sdiscouraged by the PNG\n    specification "
+                      "[first occurrence was at character position #%d]\n",
+                      (unsigned)p[result], (p[result] == 27)? "strongly " : "",
+                      result+1);
+                    fflush(stderr);
+#ifdef FORBID_LATIN1_CTRL
+                    wpng_info.have_text &= ~TEXT_URL;
+                    valid = FALSE;
+#else
+                    if (p[result] == 27) {    /* escape character */
+                        wpng_info.have_text &= ~TEXT_URL;
+                        valid = FALSE;
+                    }
+#endif
+                }
+            }
+        } while (!valid);
+
+#ifndef DOS_OS2_W32
+        fclose(keybd);
+#endif
+
+    } else if (text) {
+        fprintf(stderr, PROGNAME ":  unable to allocate memory for text\n");
+        text = FALSE;
+        wpng_info.have_text = 0;
+    }
+
+
+    /* allocate libpng stuff, initialize transformations, write pre-IDAT data */
+
+    if ((rc = writepng_init(&wpng_info)) != 0) {
+        switch (rc) {
+            case 2:
+                fprintf(stderr, PROGNAME
+                  ":  libpng initialization problem (longjmp)\n");
+                break;
+            case 4:
+                fprintf(stderr, PROGNAME ":  insufficient memory\n");
+                break;
+            case 11:
+                fprintf(stderr, PROGNAME
+                  ":  internal logic error (unexpected PNM type)\n");
+                break;
+            default:
+                fprintf(stderr, PROGNAME
+                  ":  unknown writepng_init() error\n");
+                break;
+        }
+        exit(rc);
+    }
+
+
+    /* free textbuf, since it's a completely local variable and all text info
+     * has just been written to the PNG file */
+
+    if (text && textbuf) {
+        free(textbuf);
+        textbuf = NULL;
+    }
+
+
+    /* calculate rowbytes on basis of image type; note that this becomes much
+     * more complicated if we choose to support PBM type, ASCII PNM types, or
+     * 16-bit-per-sample binary data [currently not an official NetPBM type] */
+
+    if (wpng_info.pnmtype == 5)
+        rowbytes = wpng_info.width;
+    else if (wpng_info.pnmtype == 6)
+        rowbytes = wpng_info.width * 3;
+    else /* if (wpng_info.pnmtype == 8) */
+        rowbytes = wpng_info.width * 4;
+
+
+    /* read and write the image, either in its entirety (if writing interlaced
+     * PNG) or row by row (if non-interlaced) */
+
+    fprintf(stderr, "Encoding image data...\n");
+    fflush(stderr);
+
+    if (wpng_info.interlaced) {
+        long i;
+        ulg bytes;
+        ulg image_bytes = rowbytes * wpng_info.height;   /* overflow? */
+
+        wpng_info.image_data = (uch *)malloc(image_bytes);
+        wpng_info.row_pointers = (uch **)malloc(wpng_info.height*sizeof(uch *));
+        if (wpng_info.image_data == NULL || wpng_info.row_pointers == NULL) {
+            fprintf(stderr, PROGNAME ":  insufficient memory for image data\n");
+            writepng_cleanup(&wpng_info);
+            wpng_cleanup();
+            exit(5);
+        }
+        for (i = 0;  i < wpng_info.height;  ++i)
+            wpng_info.row_pointers[i] = wpng_info.image_data + i*rowbytes;
+        bytes = fread(wpng_info.image_data, 1, image_bytes, wpng_info.infile);
+        if (bytes != image_bytes) {
+            fprintf(stderr, PROGNAME ":  expected %lu bytes, got %lu bytes\n",
+              image_bytes, bytes);
+            fprintf(stderr, "  (continuing anyway)\n");
+        }
+        if (writepng_encode_image(&wpng_info) != 0) {
+            fprintf(stderr, PROGNAME
+              ":  libpng problem (longjmp) while writing image data\n");
+            writepng_cleanup(&wpng_info);
+            wpng_cleanup();
+            exit(2);
+        }
+
+    } else /* not interlaced:  write progressively (row by row) */ {
+        long j;
+        ulg bytes;
+
+        wpng_info.image_data = (uch *)malloc(rowbytes);
+        if (wpng_info.image_data == NULL) {
+            fprintf(stderr, PROGNAME ":  insufficient memory for row data\n");
+            writepng_cleanup(&wpng_info);
+            wpng_cleanup();
+            exit(5);
+        }
+        error = 0;
+        for (j = wpng_info.height;  j > 0L;  --j) {
+            bytes = fread(wpng_info.image_data, 1, rowbytes, wpng_info.infile);
+            if (bytes != rowbytes) {
+                fprintf(stderr, PROGNAME
+                  ":  expected %lu bytes, got %lu bytes (row %ld)\n", rowbytes,
+                  bytes, wpng_info.height-j);
+                ++error;
+                break;
+            }
+            if (writepng_encode_row(&wpng_info) != 0) {
+                fprintf(stderr, PROGNAME
+                  ":  libpng problem (longjmp) while writing row %ld\n",
+                  wpng_info.height-j);
+                ++error;
+                break;
+            }
+        }
+        if (error) {
+            writepng_cleanup(&wpng_info);
+            wpng_cleanup();
+            exit(2);
+        }
+        if (writepng_encode_finish(&wpng_info) != 0) {
+            fprintf(stderr, PROGNAME ":  error on final libpng call\n");
+            writepng_cleanup(&wpng_info);
+            wpng_cleanup();
+            exit(2);
+        }
+    }
+
+
+    /* OK, we're done (successfully):  clean up all resources and quit */
+
+    fprintf(stderr, "Done.\n");
+    fflush(stderr);
+
+    writepng_cleanup(&wpng_info);
+    wpng_cleanup();
+
+    return 0;
+}
+
+
+
+
+
+static int wpng_isvalid_latin1(uch *p, int len)
+{
+    int i, result = -1;
+
+    for (i = 0;  i < len;  ++i) {
+        if (p[i] == 10 || (p[i] > 31 && p[i] < 127) || p[i] > 160)
+            continue;           /* character is completely OK */
+        if (result < 0 || (p[result] != 27 && p[i] == 27))
+            result = i;         /* mark location of first questionable one */
+    }                           /*  or of first escape character (bad) */
+
+    return result;
+}
+
+
+
+
+
+static void wpng_cleanup(void)
+{
+    if (wpng_info.outfile) {
+        fclose(wpng_info.outfile);
+        wpng_info.outfile = NULL;
+    }
+
+    if (wpng_info.infile) {
+        fclose(wpng_info.infile);
+        wpng_info.infile = NULL;
+    }
+
+    if (wpng_info.image_data) {
+        free(wpng_info.image_data);
+        wpng_info.image_data = NULL;
+    }
+
+    if (wpng_info.row_pointers) {
+        free(wpng_info.row_pointers);
+        wpng_info.row_pointers = NULL;
+    }
+}
+
+
+
+
+#ifdef DOS_OS2_W32
+
+static char *dos_kbd_gets(char *buf, int len)
+{
+    int ch, count=0;
+
+    do {
+        buf[count++] = ch = getche();
+    } while (ch != '\r' && count < len-1);
+
+    buf[count--] = '\0';        /* terminate string */
+    if (buf[count] == '\r')     /* Enter key makes CR, so change to newline */
+        buf[count] = '\n';
+
+    fprintf(stderr, "\n");      /* Enter key does *not* cause a newline */
+    fflush(stderr);
+
+    return buf;
+}
+
+#endif /* DOS_OS2_W32 */
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.c b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.c
index 8373c16..f07f4a8 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.c
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.c
@@ -1,400 +1,400 @@
-/*---------------------------------------------------------------------------

-

-   wpng - simple PNG-writing program                             writepng.c

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-

-#include <stdlib.h>     /* for exit() prototype */

-

-#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */

-#include "writepng.h"   /* typedefs, common macros, public prototypes */

-

-

-/* local prototype */

-

-static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);

-

-

-

-void writepng_version_info(void)

-{

-  fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",

-    PNG_LIBPNG_VER_STRING, png_libpng_ver);

-  fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",

-    ZLIB_VERSION, zlib_version);

-}

-

-

-

-

-/* returns 0 for success, 2 for libpng problem, 4 for out of memory, 11 for

- *  unexpected pnmtype; note that outfile might be stdout */

-

-int writepng_init(mainprog_info *mainprog_ptr)

-{

-    png_structp  png_ptr;       /* note:  temporary variables! */

-    png_infop  info_ptr;

-    int color_type, interlace_type;

-

-

-    /* could also replace libpng warning-handler (final NULL), but no need: */

-

-    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,

-      writepng_error_handler, NULL);

-    if (!png_ptr)

-        return 4;   /* out of memory */

-

-    info_ptr = png_create_info_struct(png_ptr);

-    if (!info_ptr) {

-        png_destroy_write_struct(&png_ptr, NULL);

-        return 4;   /* out of memory */

-    }

-

-

-    /* setjmp() must be called in every function that calls a PNG-writing

-     * libpng function, unless an alternate error handler was installed--

-     * but compatible error handlers must either use longjmp() themselves

-     * (as in this program) or some other method to return control to

-     * application code, so here we go: */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-        return 2;

-    }

-

-

-    /* make sure outfile is (re)opened in BINARY mode */

-

-    png_init_io(png_ptr, mainprog_ptr->outfile);

-

-

-    /* set the compression levels--in general, always want to leave filtering

-     * turned on (except for palette images) and allow all of the filters,

-     * which is the default; want 32K zlib window, unless entire image buffer

-     * is 16K or smaller (unknown here)--also the default; usually want max

-     * compression (NOT the default); and remaining compression flags should

-     * be left alone */

-

-    png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);

-/*

-    >> this is default for no filtering; Z_FILTERED is default otherwise:

-    png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);

-    >> these are all defaults:

-    png_set_compression_mem_level(png_ptr, 8);

-    png_set_compression_window_bits(png_ptr, 15);

-    png_set_compression_method(png_ptr, 8);

- */

-

-

-    /* set the image parameters appropriately */

-

-    if (mainprog_ptr->pnmtype == 5)

-        color_type = PNG_COLOR_TYPE_GRAY;

-    else if (mainprog_ptr->pnmtype == 6)

-        color_type = PNG_COLOR_TYPE_RGB;

-    else if (mainprog_ptr->pnmtype == 8)

-        color_type = PNG_COLOR_TYPE_RGB_ALPHA;

-    else {

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-        return 11;

-    }

-

-    interlace_type = mainprog_ptr->interlaced? PNG_INTERLACE_ADAM7 :

-                                               PNG_INTERLACE_NONE;

-

-    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,

-      mainprog_ptr->sample_depth, color_type, interlace_type,

-      PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

-

-    if (mainprog_ptr->gamma > 0.0)

-        png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma);

-

-    if (mainprog_ptr->have_bg) {   /* we know it's RGBA, not gray+alpha */

-        png_color_16  background;

-

-        background.red = mainprog_ptr->bg_red;

-        background.green = mainprog_ptr->bg_green;

-        background.blue = mainprog_ptr->bg_blue;

-        png_set_bKGD(png_ptr, info_ptr, &background);

-    }

-

-    if (mainprog_ptr->have_time) {

-        png_time  modtime;

-

-        png_convert_from_time_t(&modtime, mainprog_ptr->modtime);

-        png_set_tIME(png_ptr, info_ptr, &modtime);

-    }

-

-    if (mainprog_ptr->have_text) {

-        png_text  text[6];

-        int  num_text = 0;

-

-        if (mainprog_ptr->have_text & TEXT_TITLE) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "Title";

-            text[num_text].text = mainprog_ptr->title;

-            ++num_text;

-        }

-        if (mainprog_ptr->have_text & TEXT_AUTHOR) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "Author";

-            text[num_text].text = mainprog_ptr->author;

-            ++num_text;

-        }

-        if (mainprog_ptr->have_text & TEXT_DESC) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "Description";

-            text[num_text].text = mainprog_ptr->desc;

-            ++num_text;

-        }

-        if (mainprog_ptr->have_text & TEXT_COPY) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "Copyright";

-            text[num_text].text = mainprog_ptr->copyright;

-            ++num_text;

-        }

-        if (mainprog_ptr->have_text & TEXT_EMAIL) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "E-mail";

-            text[num_text].text = mainprog_ptr->email;

-            ++num_text;

-        }

-        if (mainprog_ptr->have_text & TEXT_URL) {

-            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;

-            text[num_text].key = "URL";

-            text[num_text].text = mainprog_ptr->url;

-            ++num_text;

-        }

-        png_set_text(png_ptr, info_ptr, text, num_text);

-    }

-

-

-    /* write all chunks up to (but not including) first IDAT */

-

-    png_write_info(png_ptr, info_ptr);

-

-

-    /* if we wanted to write any more text info *after* the image data, we

-     * would set up text struct(s) here and call png_set_text() again, with

-     * just the new data; png_set_tIME() could also go here, but it would

-     * have no effect since we already called it above (only one tIME chunk

-     * allowed) */

-

-

-    /* set up the transformations:  for now, just pack low-bit-depth pixels

-     * into bytes (one, two or four pixels per byte) */

-

-    png_set_packing(png_ptr);

-/*  png_set_shift(png_ptr, &sig_bit);  to scale low-bit-depth values */

-

-

-    /* make sure we save our pointers for use in writepng_encode_image() */

-

-    mainprog_ptr->png_ptr = png_ptr;

-    mainprog_ptr->info_ptr = info_ptr;

-

-

-    /* OK, that's all we need to do for now; return happy */

-

-    return 0;

-}

-

-

-

-

-

-/* returns 0 for success, 2 for libpng (longjmp) problem */

-

-int writepng_encode_image(mainprog_info *mainprog_ptr)

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-

-    /* as always, setjmp() must be called in every function that calls a

-     * PNG-writing libpng function */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-        mainprog_ptr->png_ptr = NULL;

-        mainprog_ptr->info_ptr = NULL;

-        return 2;

-    }

-

-

-    /* and now we just write the whole image; libpng takes care of interlacing

-     * for us */

-

-    png_write_image(png_ptr, mainprog_ptr->row_pointers);

-

-

-    /* since that's it, we also close out the end of the PNG file now--if we

-     * had any text or time info to write after the IDATs, second argument

-     * would be info_ptr, but we optimize slightly by sending NULL pointer: */

-

-    png_write_end(png_ptr, NULL);

-

-    return 0;

-}

-

-

-

-

-

-/* returns 0 if succeeds, 2 if libpng problem */

-

-int writepng_encode_row(mainprog_info *mainprog_ptr)  /* NON-interlaced only! */

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-

-    /* as always, setjmp() must be called in every function that calls a

-     * PNG-writing libpng function */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-        mainprog_ptr->png_ptr = NULL;

-        mainprog_ptr->info_ptr = NULL;

-        return 2;

-    }

-

-

-    /* image_data points at our one row of image data */

-

-    png_write_row(png_ptr, mainprog_ptr->image_data);

-

-    return 0;

-}

-

-

-

-

-

-/* returns 0 if succeeds, 2 if libpng problem */

-

-int writepng_encode_finish(mainprog_info *mainprog_ptr)   /* NON-interlaced! */

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-

-    /* as always, setjmp() must be called in every function that calls a

-     * PNG-writing libpng function */

-

-    if (setjmp(mainprog_ptr->jmpbuf)) {

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-        mainprog_ptr->png_ptr = NULL;

-        mainprog_ptr->info_ptr = NULL;

-        return 2;

-    }

-

-

-    /* close out PNG file; if we had any text or time info to write after

-     * the IDATs, second argument would be info_ptr: */

-

-    png_write_end(png_ptr, NULL);

-

-    return 0;

-}

-

-

-

-

-

-void writepng_cleanup(mainprog_info *mainprog_ptr)

-{

-    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;

-    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;

-

-    if (png_ptr && info_ptr)

-        png_destroy_write_struct(&png_ptr, &info_ptr);

-}

-

-

-

-

-

-static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)

-{

-    mainprog_info  *mainprog_ptr;

-

-    /* This function, aside from the extra step of retrieving the "error

-     * pointer" (below) and the fact that it exists within the application

-     * rather than within libpng, is essentially identical to libpng's

-     * default error handler.  The second point is critical:  since both

-     * setjmp() and longjmp() are called from the same code, they are

-     * guaranteed to have compatible notions of how big a jmp_buf is,

-     * regardless of whether _BSD_SOURCE or anything else has (or has not)

-     * been defined. */

-

-    fprintf(stderr, "writepng libpng error: %s\n", msg);

-    fflush(stderr);

-

-    mainprog_ptr = png_get_error_ptr(png_ptr);

-    if (mainprog_ptr == NULL) {         /* we are completely hosed now */

-        fprintf(stderr,

-          "writepng severe error:  jmpbuf not recoverable; terminating.\n");

-        fflush(stderr);

-        exit(99);

-    }

-

-    /* Now we have our data structure we can use the information in it

-     * to return control to our own higher level code (all the points

-     * where 'setjmp' is called in this file.)  This will work with other

-     * error handling mechanisms as well - libpng always calls png_error

-     * when it can proceed no further, thus, so long as the error handler

-     * is intercepted, application code can do its own error recovery.

-     */

-    longjmp(mainprog_ptr->jmpbuf, 1);

-}

+/*---------------------------------------------------------------------------
+
+   wpng - simple PNG-writing program                             writepng.c
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+
+#include <stdlib.h>     /* for exit() prototype */
+
+#include "png.h"        /* libpng header; includes zlib.h and setjmp.h */
+#include "writepng.h"   /* typedefs, common macros, public prototypes */
+
+
+/* local prototype */
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg);
+
+
+
+void writepng_version_info(void)
+{
+  fprintf(stderr, "   Compiled with libpng %s; using libpng %s.\n",
+    PNG_LIBPNG_VER_STRING, png_libpng_ver);
+  fprintf(stderr, "   Compiled with zlib %s; using zlib %s.\n",
+    ZLIB_VERSION, zlib_version);
+}
+
+
+
+
+/* returns 0 for success, 2 for libpng problem, 4 for out of memory, 11 for
+ *  unexpected pnmtype; note that outfile might be stdout */
+
+int writepng_init(mainprog_info *mainprog_ptr)
+{
+    png_structp  png_ptr;       /* note:  temporary variables! */
+    png_infop  info_ptr;
+    int color_type, interlace_type;
+
+
+    /* could also replace libpng warning-handler (final NULL), but no need: */
+
+    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, mainprog_ptr,
+      writepng_error_handler, NULL);
+    if (!png_ptr)
+        return 4;   /* out of memory */
+
+    info_ptr = png_create_info_struct(png_ptr);
+    if (!info_ptr) {
+        png_destroy_write_struct(&png_ptr, NULL);
+        return 4;   /* out of memory */
+    }
+
+
+    /* setjmp() must be called in every function that calls a PNG-writing
+     * libpng function, unless an alternate error handler was installed--
+     * but compatible error handlers must either use longjmp() themselves
+     * (as in this program) or some other method to return control to
+     * application code, so here we go: */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return 2;
+    }
+
+
+    /* make sure outfile is (re)opened in BINARY mode */
+
+    png_init_io(png_ptr, mainprog_ptr->outfile);
+
+
+    /* set the compression levels--in general, always want to leave filtering
+     * turned on (except for palette images) and allow all of the filters,
+     * which is the default; want 32K zlib window, unless entire image buffer
+     * is 16K or smaller (unknown here)--also the default; usually want max
+     * compression (NOT the default); and remaining compression flags should
+     * be left alone */
+
+    png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
+/*
+    >> this is default for no filtering; Z_FILTERED is default otherwise:
+    png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
+    >> these are all defaults:
+    png_set_compression_mem_level(png_ptr, 8);
+    png_set_compression_window_bits(png_ptr, 15);
+    png_set_compression_method(png_ptr, 8);
+ */
+
+
+    /* set the image parameters appropriately */
+
+    if (mainprog_ptr->pnmtype == 5)
+        color_type = PNG_COLOR_TYPE_GRAY;
+    else if (mainprog_ptr->pnmtype == 6)
+        color_type = PNG_COLOR_TYPE_RGB;
+    else if (mainprog_ptr->pnmtype == 8)
+        color_type = PNG_COLOR_TYPE_RGB_ALPHA;
+    else {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        return 11;
+    }
+
+    interlace_type = mainprog_ptr->interlaced? PNG_INTERLACE_ADAM7 :
+                                               PNG_INTERLACE_NONE;
+
+    png_set_IHDR(png_ptr, info_ptr, mainprog_ptr->width, mainprog_ptr->height,
+      mainprog_ptr->sample_depth, color_type, interlace_type,
+      PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+    if (mainprog_ptr->gamma > 0.0)
+        png_set_gAMA(png_ptr, info_ptr, mainprog_ptr->gamma);
+
+    if (mainprog_ptr->have_bg) {   /* we know it's RGBA, not gray+alpha */
+        png_color_16  background;
+
+        background.red = mainprog_ptr->bg_red;
+        background.green = mainprog_ptr->bg_green;
+        background.blue = mainprog_ptr->bg_blue;
+        png_set_bKGD(png_ptr, info_ptr, &background);
+    }
+
+    if (mainprog_ptr->have_time) {
+        png_time  modtime;
+
+        png_convert_from_time_t(&modtime, mainprog_ptr->modtime);
+        png_set_tIME(png_ptr, info_ptr, &modtime);
+    }
+
+    if (mainprog_ptr->have_text) {
+        png_text  text[6];
+        int  num_text = 0;
+
+        if (mainprog_ptr->have_text & TEXT_TITLE) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "Title";
+            text[num_text].text = mainprog_ptr->title;
+            ++num_text;
+        }
+        if (mainprog_ptr->have_text & TEXT_AUTHOR) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "Author";
+            text[num_text].text = mainprog_ptr->author;
+            ++num_text;
+        }
+        if (mainprog_ptr->have_text & TEXT_DESC) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "Description";
+            text[num_text].text = mainprog_ptr->desc;
+            ++num_text;
+        }
+        if (mainprog_ptr->have_text & TEXT_COPY) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "Copyright";
+            text[num_text].text = mainprog_ptr->copyright;
+            ++num_text;
+        }
+        if (mainprog_ptr->have_text & TEXT_EMAIL) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "E-mail";
+            text[num_text].text = mainprog_ptr->email;
+            ++num_text;
+        }
+        if (mainprog_ptr->have_text & TEXT_URL) {
+            text[num_text].compression = PNG_TEXT_COMPRESSION_NONE;
+            text[num_text].key = "URL";
+            text[num_text].text = mainprog_ptr->url;
+            ++num_text;
+        }
+        png_set_text(png_ptr, info_ptr, text, num_text);
+    }
+
+
+    /* write all chunks up to (but not including) first IDAT */
+
+    png_write_info(png_ptr, info_ptr);
+
+
+    /* if we wanted to write any more text info *after* the image data, we
+     * would set up text struct(s) here and call png_set_text() again, with
+     * just the new data; png_set_tIME() could also go here, but it would
+     * have no effect since we already called it above (only one tIME chunk
+     * allowed) */
+
+
+    /* set up the transformations:  for now, just pack low-bit-depth pixels
+     * into bytes (one, two or four pixels per byte) */
+
+    png_set_packing(png_ptr);
+/*  png_set_shift(png_ptr, &sig_bit);  to scale low-bit-depth values */
+
+
+    /* make sure we save our pointers for use in writepng_encode_image() */
+
+    mainprog_ptr->png_ptr = png_ptr;
+    mainprog_ptr->info_ptr = info_ptr;
+
+
+    /* OK, that's all we need to do for now; return happy */
+
+    return 0;
+}
+
+
+
+
+
+/* returns 0 for success, 2 for libpng (longjmp) problem */
+
+int writepng_encode_image(mainprog_info *mainprog_ptr)
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+
+    /* as always, setjmp() must be called in every function that calls a
+     * PNG-writing libpng function */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        mainprog_ptr->png_ptr = NULL;
+        mainprog_ptr->info_ptr = NULL;
+        return 2;
+    }
+
+
+    /* and now we just write the whole image; libpng takes care of interlacing
+     * for us */
+
+    png_write_image(png_ptr, mainprog_ptr->row_pointers);
+
+
+    /* since that's it, we also close out the end of the PNG file now--if we
+     * had any text or time info to write after the IDATs, second argument
+     * would be info_ptr, but we optimize slightly by sending NULL pointer: */
+
+    png_write_end(png_ptr, NULL);
+
+    return 0;
+}
+
+
+
+
+
+/* returns 0 if succeeds, 2 if libpng problem */
+
+int writepng_encode_row(mainprog_info *mainprog_ptr)  /* NON-interlaced only! */
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+
+    /* as always, setjmp() must be called in every function that calls a
+     * PNG-writing libpng function */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        mainprog_ptr->png_ptr = NULL;
+        mainprog_ptr->info_ptr = NULL;
+        return 2;
+    }
+
+
+    /* image_data points at our one row of image data */
+
+    png_write_row(png_ptr, mainprog_ptr->image_data);
+
+    return 0;
+}
+
+
+
+
+
+/* returns 0 if succeeds, 2 if libpng problem */
+
+int writepng_encode_finish(mainprog_info *mainprog_ptr)   /* NON-interlaced! */
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+
+    /* as always, setjmp() must be called in every function that calls a
+     * PNG-writing libpng function */
+
+    if (setjmp(mainprog_ptr->jmpbuf)) {
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+        mainprog_ptr->png_ptr = NULL;
+        mainprog_ptr->info_ptr = NULL;
+        return 2;
+    }
+
+
+    /* close out PNG file; if we had any text or time info to write after
+     * the IDATs, second argument would be info_ptr: */
+
+    png_write_end(png_ptr, NULL);
+
+    return 0;
+}
+
+
+
+
+
+void writepng_cleanup(mainprog_info *mainprog_ptr)
+{
+    png_structp png_ptr = (png_structp)mainprog_ptr->png_ptr;
+    png_infop info_ptr = (png_infop)mainprog_ptr->info_ptr;
+
+    if (png_ptr && info_ptr)
+        png_destroy_write_struct(&png_ptr, &info_ptr);
+}
+
+
+
+
+
+static void writepng_error_handler(png_structp png_ptr, png_const_charp msg)
+{
+    mainprog_info  *mainprog_ptr;
+
+    /* This function, aside from the extra step of retrieving the "error
+     * pointer" (below) and the fact that it exists within the application
+     * rather than within libpng, is essentially identical to libpng's
+     * default error handler.  The second point is critical:  since both
+     * setjmp() and longjmp() are called from the same code, they are
+     * guaranteed to have compatible notions of how big a jmp_buf is,
+     * regardless of whether _BSD_SOURCE or anything else has (or has not)
+     * been defined. */
+
+    fprintf(stderr, "writepng libpng error: %s\n", msg);
+    fflush(stderr);
+
+    mainprog_ptr = png_get_error_ptr(png_ptr);
+    if (mainprog_ptr == NULL) {         /* we are completely hosed now */
+        fprintf(stderr,
+          "writepng severe error:  jmpbuf not recoverable; terminating.\n");
+        fflush(stderr);
+        exit(99);
+    }
+
+    /* Now we have our data structure we can use the information in it
+     * to return control to our own higher level code (all the points
+     * where 'setjmp' is called in this file.)  This will work with other
+     * error handling mechanisms as well - libpng always calls png_error
+     * when it can proceed no further, thus, so long as the error handler
+     * is intercepted, application code can do its own error recovery.
+     */
+    longjmp(mainprog_ptr->jmpbuf, 1);
+}
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.h b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.h
index 904e4fb..78b966b 100644
--- a/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.h
+++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/contrib/gregbook/writepng.h
@@ -1,133 +1,133 @@
-/*---------------------------------------------------------------------------

-

-   wpng - simple PNG-writing program                             writepng.h

-

-  ---------------------------------------------------------------------------

-

-      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.

-

-      This software is provided "as is," without warranty of any kind,

-      express or implied.  In no event shall the author or contributors

-      be held liable for any damages arising in any way from the use of

-      this software.

-

-      The contents of this file are DUAL-LICENSED.  You may modify and/or

-      redistribute this software according to the terms of one of the

-      following two licenses (at your option):

-

-

-      LICENSE 1 ("BSD-like with advertising clause"):

-

-      Permission is granted to anyone to use this software for any purpose,

-      including commercial applications, and to alter it and redistribute

-      it freely, subject to the following restrictions:

-

-      1. Redistributions of source code must retain the above copyright

-         notice, disclaimer, and this list of conditions.

-      2. Redistributions in binary form must reproduce the above copyright

-         notice, disclaimer, and this list of conditions in the documenta-

-         tion and/or other materials provided with the distribution.

-      3. All advertising materials mentioning features or use of this

-         software must display the following acknowledgment:

-

-            This product includes software developed by Greg Roelofs

-            and contributors for the book, "PNG: The Definitive Guide,"

-            published by O'Reilly and Associates.

-

-

-      LICENSE 2 (GNU GPL v2 or later):

-

-      This program is free software; you can redistribute it and/or modify

-      it under the terms of the GNU General Public License as published by

-      the Free Software Foundation; either version 2 of the License, or

-      (at your option) any later version.

-

-      This program is distributed in the hope that it will be useful,

-      but WITHOUT ANY WARRANTY; without even the implied warranty of

-      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-      GNU General Public License for more details.

-

-      You should have received a copy of the GNU General Public License

-      along with this program; if not, write to the Free Software Foundation,

-      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

-

-  ---------------------------------------------------------------------------*/

-

-#ifndef TRUE

-#  define TRUE 1

-#  define FALSE 0

-#endif

-

-#ifndef MAX

-#  define MAX(a,b)  ((a) > (b)? (a) : (b))

-#  define MIN(a,b)  ((a) < (b)? (a) : (b))

-#endif

-

-#ifdef DEBUG

-#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}

-#else

-#  define Trace(x)  ;

-#endif

-

-#define TEXT_TITLE    0x01

-#define TEXT_AUTHOR   0x02

-#define TEXT_DESC     0x04

-#define TEXT_COPY     0x08

-#define TEXT_EMAIL    0x10

-#define TEXT_URL      0x20

-

-#define TEXT_TITLE_OFFSET        0

-#define TEXT_AUTHOR_OFFSET      72

-#define TEXT_COPY_OFFSET     (2*72)

-#define TEXT_EMAIL_OFFSET    (3*72)

-#define TEXT_URL_OFFSET      (4*72)

-#define TEXT_DESC_OFFSET     (5*72)

-

-typedef unsigned char   uch;

-typedef unsigned short  ush;

-typedef unsigned long   ulg;

-

-typedef struct _mainprog_info {

-    double gamma;

-    long width;

-    long height;

-    time_t modtime;

-    FILE *infile;

-    FILE *outfile;

-    void *png_ptr;

-    void *info_ptr;

-    uch *image_data;

-    uch **row_pointers;

-    char *title;

-    char *author;

-    char *desc;

-    char *copyright;

-    char *email;

-    char *url;

-    int filter;    /* command-line-filter flag, not PNG row filter! */

-    int pnmtype;

-    int sample_depth;

-    int interlaced;

-    int have_bg;

-    int have_time;

-    int have_text;

-    jmp_buf jmpbuf;

-    uch bg_red;

-    uch bg_green;

-    uch bg_blue;

-} mainprog_info;

-

-

-/* prototypes for public functions in writepng.c */

-

-void writepng_version_info(void);

-

-int writepng_init(mainprog_info *mainprog_ptr);

-

-int writepng_encode_image(mainprog_info *mainprog_ptr);

-

-int writepng_encode_row(mainprog_info *mainprog_ptr);

-

-int writepng_encode_finish(mainprog_info *mainprog_ptr);

-

-void writepng_cleanup(mainprog_info *mainprog_ptr);

+/*---------------------------------------------------------------------------
+
+   wpng - simple PNG-writing program                             writepng.h
+
+  ---------------------------------------------------------------------------
+
+      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
+
+      This software is provided "as is," without warranty of any kind,
+      express or implied.  In no event shall the author or contributors
+      be held liable for any damages arising in any way from the use of
+      this software.
+
+      The contents of this file are DUAL-LICENSED.  You may modify and/or
+      redistribute this software according to the terms of one of the
+      following two licenses (at your option):
+
+
+      LICENSE 1 ("BSD-like with advertising clause"):
+
+      Permission is granted to anyone to use this software for any purpose,
+      including commercial applications, and to alter it and redistribute
+      it freely, subject to the following restrictions:
+
+      1. Redistributions of source code must retain the above copyright
+         notice, disclaimer, and this list of conditions.
+      2. Redistributions in binary form must reproduce the above copyright
+         notice, disclaimer, and this list of conditions in the documenta-
+         tion and/or other materials provided with the distribution.
+      3. All advertising materials mentioning features or use of this
+         software must display the following acknowledgment:
+
+            This product includes software developed by Greg Roelofs
+            and contributors for the book, "PNG: The Definitive Guide,"
+            published by O'Reilly and Associates.
+
+
+      LICENSE 2 (GNU GPL v2 or later):
+
+      This program is free software; you can redistribute it and/or modify
+      it under the terms of the GNU General Public License as published by
+      the Free Software Foundation; either version 2 of the License, or
+      (at your option) any later version.
+
+      This program is distributed in the hope that it will be useful,
+      but WITHOUT ANY WARRANTY; without even the implied warranty of
+      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+      GNU General Public License for more details.
+
+      You should have received a copy of the GNU General Public License
+      along with this program; if not, write to the Free Software Foundation,
+      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+  ---------------------------------------------------------------------------*/
+
+#ifndef TRUE
+#  define TRUE 1
+#  define FALSE 0
+#endif
+
+#ifndef MAX
+#  define MAX(a,b)  ((a) > (b)? (a) : (b))
+#  define MIN(a,b)  ((a) < (b)? (a) : (b))
+#endif
+
+#ifdef DEBUG
+#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
+#else
+#  define Trace(x)  ;
+#endif
+
+#define TEXT_TITLE    0x01
+#define TEXT_AUTHOR   0x02
+#define TEXT_DESC     0x04
+#define TEXT_COPY     0x08
+#define TEXT_EMAIL    0x10
+#define TEXT_URL      0x20
+
+#define TEXT_TITLE_OFFSET        0
+#define TEXT_AUTHOR_OFFSET      72
+#define TEXT_COPY_OFFSET     (2*72)
+#define TEXT_EMAIL_OFFSET    (3*72)
+#define TEXT_URL_OFFSET      (4*72)
+#define TEXT_DESC_OFFSET     (5*72)
+
+typedef unsigned char   uch;
+typedef unsigned short  ush;
+typedef unsigned long   ulg;
+
+typedef struct _mainprog_info {
+    double gamma;
+    long width;
+    long height;
+    time_t modtime;
+    FILE *infile;
+    FILE *outfile;
+    void *png_ptr;
+    void *info_ptr;
+    uch *image_data;
+    uch **row_pointers;
+    char *title;
+    char *author;
+    char *desc;
+    char *copyright;
+    char *email;
+    char *url;
+    int filter;    /* command-line-filter flag, not PNG row filter! */
+    int pnmtype;
+    int sample_depth;
+    int interlaced;
+    int have_bg;
+    int have_time;
+    int have_text;
+    jmp_buf jmpbuf;
+    uch bg_red;
+    uch bg_green;
+    uch bg_blue;
+} mainprog_info;
+
+
+/* prototypes for public functions in writepng.c */
+
+void writepng_version_info(void);
+
+int writepng_init(mainprog_info *mainprog_ptr);
+
+int writepng_encode_image(mainprog_info *mainprog_ptr);
+
+int writepng_encode_row(mainprog_info *mainprog_ptr);
+
+int writepng_encode_finish(mainprog_info *mainprog_ptr);
+
+void writepng_cleanup(mainprog_info *mainprog_ptr);