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| 1 | README for libpng version 1.5.9 - February 18, 2012 (shared library 15.0) | 1 | README for libpng version 1.5.9 - February 18, 2012 (shared library 15.0) |
| 2 | See the note about version numbers near the top of png.h | 2 | See the note about version numbers near the top of png.h |
| 3 | 3 | ||
| 4 | See INSTALL for instructions on how to install libpng. | 4 | See INSTALL for instructions on how to install libpng. |
| 5 | 5 | ||
| 6 | Libpng comes in several distribution formats. Get libpng-*.tar.gz, | 6 | Libpng comes in several distribution formats. Get libpng-*.tar.gz, |
| 7 | libpng-*.tar.xz or libpng-*.tar.bz2 if you want UNIX-style line endings | 7 | libpng-*.tar.xz or libpng-*.tar.bz2 if you want UNIX-style line endings |
| 8 | in the text files, or lpng*.zip if you want DOS-style line endings. | 8 | in the text files, or lpng*.zip if you want DOS-style line endings. |
| 9 | 9 | ||
| 10 | Version 0.89 was the first official release of libpng. Don't let the | 10 | Version 0.89 was the first official release of libpng. Don't let the |
| 11 | fact that it's the first release fool you. The libpng library has been in | 11 | fact that it's the first release fool you. The libpng library has been in |
| 12 | extensive use and testing since mid-1995. By late 1997 it had | 12 | extensive use and testing since mid-1995. By late 1997 it had |
| 13 | finally gotten to the stage where there hadn't been significant | 13 | finally gotten to the stage where there hadn't been significant |
| 14 | changes to the API in some time, and people have a bad feeling about | 14 | changes to the API in some time, and people have a bad feeling about |
| 15 | libraries with versions < 1.0. Version 1.0.0 was released in | 15 | libraries with versions < 1.0. Version 1.0.0 was released in |
| 16 | March 1998. | 16 | March 1998. |
| 17 | 17 | ||
| 18 | **** | 18 | **** |
| 19 | Note that some of the changes to the png_info structure render this | 19 | Note that some of the changes to the png_info structure render this |
| 20 | version of the library binary incompatible with libpng-0.89 or | 20 | version of the library binary incompatible with libpng-0.89 or |
| 21 | earlier versions if you are using a shared library. The type of the | 21 | earlier versions if you are using a shared library. The type of the |
| 22 | "filler" parameter for png_set_filler() has changed from png_byte to | 22 | "filler" parameter for png_set_filler() has changed from png_byte to |
| 23 | png_uint_32, which will affect shared-library applications that use | 23 | png_uint_32, which will affect shared-library applications that use |
| 24 | this function. | 24 | this function. |
| 25 | 25 | ||
| 26 | To avoid problems with changes to the internals of png_info_struct, | 26 | To avoid problems with changes to the internals of png_info_struct, |
| 27 | new APIs have been made available in 0.95 to avoid direct application | 27 | new APIs have been made available in 0.95 to avoid direct application |
| 28 | access to info_ptr. These functions are the png_set_<chunk> and | 28 | access to info_ptr. These functions are the png_set_<chunk> and |
| 29 | png_get_<chunk> functions. These functions should be used when | 29 | png_get_<chunk> functions. These functions should be used when |
| 30 | accessing/storing the info_struct data, rather than manipulating it | 30 | accessing/storing the info_struct data, rather than manipulating it |
| 31 | directly, to avoid such problems in the future. | 31 | directly, to avoid such problems in the future. |
| 32 | 32 | ||
| 33 | It is important to note that the APIs do not make current programs | 33 | It is important to note that the APIs do not make current programs |
| 34 | that access the info struct directly incompatible with the new | 34 | that access the info struct directly incompatible with the new |
| 35 | library. However, it is strongly suggested that new programs use | 35 | library. However, it is strongly suggested that new programs use |
| 36 | the new APIs (as shown in example.c and pngtest.c), and older programs | 36 | the new APIs (as shown in example.c and pngtest.c), and older programs |
| 37 | be converted to the new format, to facilitate upgrades in the future. | 37 | be converted to the new format, to facilitate upgrades in the future. |
| 38 | **** | 38 | **** |
| 39 | 39 | ||
| 40 | Additions since 0.90 include the ability to compile libpng as a | 40 | Additions since 0.90 include the ability to compile libpng as a |
| 41 | Windows DLL, and new APIs for accessing data in the info struct. | 41 | Windows DLL, and new APIs for accessing data in the info struct. |
| 42 | Experimental functions include the ability to set weighting and cost | 42 | Experimental functions include the ability to set weighting and cost |
| 43 | factors for row filter selection, direct reads of integers from buffers | 43 | factors for row filter selection, direct reads of integers from buffers |
| 44 | on big-endian processors that support misaligned data access, faster | 44 | on big-endian processors that support misaligned data access, faster |
| 45 | methods of doing alpha composition, and more accurate 16->8 bit color | 45 | methods of doing alpha composition, and more accurate 16->8 bit color |
| 46 | conversion. | 46 | conversion. |
| 47 | 47 | ||
| 48 | The additions since 0.89 include the ability to read from a PNG stream | 48 | The additions since 0.89 include the ability to read from a PNG stream |
| 49 | which has had some (or all) of the signature bytes read by the calling | 49 | which has had some (or all) of the signature bytes read by the calling |
| 50 | application. This also allows the reading of embedded PNG streams that | 50 | application. This also allows the reading of embedded PNG streams that |
| 51 | do not have the PNG file signature. As well, it is now possible to set | 51 | do not have the PNG file signature. As well, it is now possible to set |
| 52 | the library action on the detection of chunk CRC errors. It is possible | 52 | the library action on the detection of chunk CRC errors. It is possible |
| 53 | to set different actions based on whether the CRC error occurred in a | 53 | to set different actions based on whether the CRC error occurred in a |
| 54 | critical or an ancillary chunk. | 54 | critical or an ancillary chunk. |
| 55 | 55 | ||
| 56 | The changes made to the library, and bugs fixed are based on discussions | 56 | The changes made to the library, and bugs fixed are based on discussions |
| 57 | on the PNG-implement mailing list and not on material submitted | 57 | on the PNG-implement mailing list and not on material submitted |
| 58 | privately to Guy, Andreas, or Glenn. They will forward any good | 58 | privately to Guy, Andreas, or Glenn. They will forward any good |
| 59 | suggestions to the list. | 59 | suggestions to the list. |
| 60 | 60 | ||
| 61 | For a detailed description on using libpng, read libpng-manual.txt. For | 61 | For a detailed description on using libpng, read libpng-manual.txt. For |
| 62 | examples of libpng in a program, see example.c and pngtest.c. For usage | 62 | examples of libpng in a program, see example.c and pngtest.c. For usage |
| 63 | information and restrictions (what little they are) on libpng, see | 63 | information and restrictions (what little they are) on libpng, see |
| 64 | png.h. For a description on using zlib (the compression library used by | 64 | png.h. For a description on using zlib (the compression library used by |
| 65 | libpng) and zlib's restrictions, see zlib.h | 65 | libpng) and zlib's restrictions, see zlib.h |
| 66 | 66 | ||
| 67 | I have included a general makefile, as well as several machine and | 67 | I have included a general makefile, as well as several machine and |
| 68 | compiler specific ones, but you may have to modify one for your own needs. | 68 | compiler specific ones, but you may have to modify one for your own needs. |
| 69 | 69 | ||
| 70 | You should use zlib 1.0.4 or later to run this, but it MAY work with | 70 | You should use zlib 1.0.4 or later to run this, but it MAY work with |
| 71 | versions as old as zlib 0.95. Even so, there are bugs in older zlib | 71 | versions as old as zlib 0.95. Even so, there are bugs in older zlib |
| 72 | versions which can cause the output of invalid compression streams for | 72 | versions which can cause the output of invalid compression streams for |
| 73 | some images. You will definitely need zlib 1.0.4 or later if you are | 73 | some images. You will definitely need zlib 1.0.4 or later if you are |
| 74 | taking advantage of the MS-DOS "far" structure allocation for the small | 74 | taking advantage of the MS-DOS "far" structure allocation for the small |
| 75 | and medium memory models. You should also note that zlib is a | 75 | and medium memory models. You should also note that zlib is a |
| 76 | compression library that is useful for more things than just PNG files. | 76 | compression library that is useful for more things than just PNG files. |
| 77 | You can use zlib as a drop-in replacement for fread() and fwrite() if | 77 | You can use zlib as a drop-in replacement for fread() and fwrite() if |
| 78 | you are so inclined. | 78 | you are so inclined. |
| 79 | 79 | ||
| 80 | zlib should be available at the same place that libpng is, or at. | 80 | zlib should be available at the same place that libpng is, or at. |
| 81 | ftp://ftp.info-zip.org/pub/infozip/zlib | 81 | ftp://ftp.info-zip.org/pub/infozip/zlib |
| 82 | 82 | ||
| 83 | You may also want a copy of the PNG specification. It is available | 83 | You may also want a copy of the PNG specification. It is available |
| 84 | as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find | 84 | as an RFC, a W3C Recommendation, and an ISO/IEC Standard. You can find |
| 85 | these at http://www.libpng.org/pub/png/documents/ | 85 | these at http://www.libpng.org/pub/png/documents/ |
| 86 | 86 | ||
| 87 | This code is currently being archived at libpng.sf.net in the | 87 | This code is currently being archived at libpng.sf.net in the |
| 88 | [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT) | 88 | [DOWNLOAD] area, and on CompuServe, Lib 20 (PNG SUPPORT) |
| 89 | at GO GRAPHSUP. If you can't find it in any of those places, | 89 | at GO GRAPHSUP. If you can't find it in any of those places, |
| 90 | e-mail me, and I'll help you find it. | 90 | e-mail me, and I'll help you find it. |
| 91 | 91 | ||
| 92 | If you have any code changes, requests, problems, etc., please e-mail | 92 | If you have any code changes, requests, problems, etc., please e-mail |
| 93 | them to me. Also, I'd appreciate any make files or project files, | 93 | them to me. Also, I'd appreciate any make files or project files, |
| 94 | and any modifications you needed to make to get libpng to compile, | 94 | and any modifications you needed to make to get libpng to compile, |
| 95 | along with a #define variable to tell what compiler/system you are on. | 95 | along with a #define variable to tell what compiler/system you are on. |
| 96 | If you needed to add transformations to libpng, or wish libpng would | 96 | If you needed to add transformations to libpng, or wish libpng would |
| 97 | provide the image in a different way, drop me a note (and code, if | 97 | provide the image in a different way, drop me a note (and code, if |
| 98 | possible), so I can consider supporting the transformation. | 98 | possible), so I can consider supporting the transformation. |
| 99 | Finally, if you get any warning messages when compiling libpng | 99 | Finally, if you get any warning messages when compiling libpng |
| 100 | (note: not zlib), and they are easy to fix, I'd appreciate the | 100 | (note: not zlib), and they are easy to fix, I'd appreciate the |
| 101 | fix. Please mention "libpng" somewhere in the subject line. Thanks. | 101 | fix. Please mention "libpng" somewhere in the subject line. Thanks. |
| 102 | 102 | ||
| 103 | This release was created and will be supported by myself (of course | 103 | This release was created and will be supported by myself (of course |
| 104 | based in a large way on Guy's and Andreas' earlier work), and the PNG | 104 | based in a large way on Guy's and Andreas' earlier work), and the PNG |
| 105 | development group. | 105 | development group. |
| 106 | 106 | ||
| 107 | Send comments/corrections/commendations to png-mng-implement at | 107 | Send comments/corrections/commendations to png-mng-implement at |
| 108 | lists.sourceforge.net (subscription required; visit | 108 | lists.sourceforge.net (subscription required; visit |
| 109 | https://lists.sourceforge.net/lists/listinfo/png-mng-implement | 109 | https://lists.sourceforge.net/lists/listinfo/png-mng-implement |
| 110 | to subscribe) or to glennrp at users.sourceforge.net | 110 | to subscribe) or to glennrp at users.sourceforge.net |
| 111 | 111 | ||
| 112 | You can't reach Guy, the original libpng author, at the addresses | 112 | You can't reach Guy, the original libpng author, at the addresses |
| 113 | given in previous versions of this document. He and Andreas will | 113 | given in previous versions of this document. He and Andreas will |
| 114 | read mail addressed to the png-implement list, however. | 114 | read mail addressed to the png-implement list, however. |
| 115 | 115 | ||
| 116 | Please do not send general questions about PNG. Send them to | 116 | Please do not send general questions about PNG. Send them to |
| 117 | png-mng-misc at lists.sf.net (subscription required; visit | 117 | png-mng-misc at lists.sf.net (subscription required; visit |
| 118 | https://lists.sourceforge.net/lists/listinfo/png-mng-misc to | 118 | https://lists.sourceforge.net/lists/listinfo/png-mng-misc to |
| 119 | subscribe). If you have a question about something | 119 | subscribe). If you have a question about something |
| 120 | in the PNG specification that is related to using libpng, send it | 120 | in the PNG specification that is related to using libpng, send it |
| 121 | to me. Send me any questions that start with "I was using libpng, | 121 | to me. Send me any questions that start with "I was using libpng, |
| 122 | and ...". If in doubt, send questions to me. I'll bounce them | 122 | and ...". If in doubt, send questions to me. I'll bounce them |
| 123 | to others, if necessary. | 123 | to others, if necessary. |
| 124 | 124 | ||
| 125 | Please do not send suggestions on how to change PNG. We have | 125 | Please do not send suggestions on how to change PNG. We have |
| 126 | been discussing PNG for sixteen years now, and it is official and | 126 | been discussing PNG for sixteen years now, and it is official and |
| 127 | finished. If you have suggestions for libpng, however, I'll | 127 | finished. If you have suggestions for libpng, however, I'll |
| 128 | gladly listen. Even if your suggestion is not used immediately, | 128 | gladly listen. Even if your suggestion is not used immediately, |
| 129 | it may be used later. | 129 | it may be used later. |
| 130 | 130 | ||
| 131 | Files in this distribution: | 131 | Files in this distribution: |
| 132 | 132 | ||
| 133 | ANNOUNCE => Announcement of this version, with recent changes | 133 | ANNOUNCE => Announcement of this version, with recent changes |
| 134 | CHANGES => Description of changes between libpng versions | 134 | CHANGES => Description of changes between libpng versions |
| 135 | KNOWNBUG => List of known bugs and deficiencies | 135 | KNOWNBUG => List of known bugs and deficiencies |
| 136 | LICENSE => License to use and redistribute libpng | 136 | LICENSE => License to use and redistribute libpng |
| 137 | README => This file | 137 | README => This file |
| 138 | TODO => Things not implemented in the current library | 138 | TODO => Things not implemented in the current library |
| 139 | Y2KINFO => Statement of Y2K compliance | 139 | Y2KINFO => Statement of Y2K compliance |
| 140 | example.c => Example code for using libpng functions | 140 | example.c => Example code for using libpng functions |
| 141 | libpng.3 => manual page for libpng (includes libpng-manual.txt) | 141 | libpng.3 => manual page for libpng (includes libpng-manual.txt) |
| 142 | libpng-manual.txt => Description of libpng and its functions | 142 | libpng-manual.txt => Description of libpng and its functions |
| 143 | libpngpf.3 => manual page for libpng's private functions | 143 | libpngpf.3 => manual page for libpng's private functions |
| 144 | png.5 => manual page for the PNG format | 144 | png.5 => manual page for the PNG format |
| 145 | png.c => Basic interface functions common to library | 145 | png.c => Basic interface functions common to library |
| 146 | png.h => Library function and interface declarations (public) | 146 | png.h => Library function and interface declarations (public) |
| 147 | pngpriv.h => Library function and interface declarations (private) | 147 | pngpriv.h => Library function and interface declarations (private) |
| 148 | pngconf.h => System specific library configuration (public) | 148 | pngconf.h => System specific library configuration (public) |
| 149 | pngstruct.h => png_struct declaration (private) | 149 | pngstruct.h => png_struct declaration (private) |
| 150 | pnginfo.h => png_info struct declaration (private) | 150 | pnginfo.h => png_info struct declaration (private) |
| 151 | pngdebug.h => debugging macros (private) | 151 | pngdebug.h => debugging macros (private) |
| 152 | pngerror.c => Error/warning message I/O functions | 152 | pngerror.c => Error/warning message I/O functions |
| 153 | pngget.c => Functions for retrieving info from struct | 153 | pngget.c => Functions for retrieving info from struct |
| 154 | pngmem.c => Memory handling functions | 154 | pngmem.c => Memory handling functions |
| 155 | pngbar.png => PNG logo, 88x31 | 155 | pngbar.png => PNG logo, 88x31 |
| 156 | pngnow.png => PNG logo, 98x31 | 156 | pngnow.png => PNG logo, 98x31 |
| 157 | pngpread.c => Progressive reading functions | 157 | pngpread.c => Progressive reading functions |
| 158 | pngread.c => Read data/helper high-level functions | 158 | pngread.c => Read data/helper high-level functions |
| 159 | pngrio.c => Lowest-level data read I/O functions | 159 | pngrio.c => Lowest-level data read I/O functions |
| 160 | pngrtran.c => Read data transformation functions | 160 | pngrtran.c => Read data transformation functions |
| 161 | pngrutil.c => Read data utility functions | 161 | pngrutil.c => Read data utility functions |
| 162 | pngset.c => Functions for storing data into the info_struct | 162 | pngset.c => Functions for storing data into the info_struct |
| 163 | pngtest.c => Library test program | 163 | pngtest.c => Library test program |
| 164 | pngtest.png => Library test sample image | 164 | pngtest.png => Library test sample image |
| 165 | pngtrans.c => Common data transformation functions | 165 | pngtrans.c => Common data transformation functions |
| 166 | pngwio.c => Lowest-level write I/O functions | 166 | pngwio.c => Lowest-level write I/O functions |
| 167 | pngwrite.c => High-level write functions | 167 | pngwrite.c => High-level write functions |
| 168 | pngwtran.c => Write data transformations | 168 | pngwtran.c => Write data transformations |
| 169 | pngwutil.c => Write utility functions | 169 | pngwutil.c => Write utility functions |
| 170 | contrib => Contributions | 170 | contrib => Contributions |
| 171 | gregbook => source code for PNG reading and writing, from | 171 | gregbook => source code for PNG reading and writing, from |
| 172 | Greg Roelofs' "PNG: The Definitive Guide", | 172 | Greg Roelofs' "PNG: The Definitive Guide", |
| 173 | O'Reilly, 1999 | 173 | O'Reilly, 1999 |
| 174 | msvctest => Builds and runs pngtest using a MSVC workspace | 174 | msvctest => Builds and runs pngtest using a MSVC workspace |
| 175 | pngminus => Simple pnm2png and png2pnm programs | 175 | pngminus => Simple pnm2png and png2pnm programs |
| 176 | pngsuite => Test images | 176 | pngsuite => Test images |
| 177 | visupng => Contains a MSVC workspace for VisualPng | 177 | visupng => Contains a MSVC workspace for VisualPng |
| 178 | projects => Contains project files and workspaces for | 178 | projects => Contains project files and workspaces for |
| 179 | building a DLL | 179 | building a DLL |
| 180 | cbuilder5 => Contains a Borland workspace for building | 180 | cbuilder5 => Contains a Borland workspace for building |
| 181 | libpng and zlib | 181 | libpng and zlib |
| 182 | visualc6 => Contains a Microsoft Visual C++ (MSVC) | 182 | visualc6 => Contains a Microsoft Visual C++ (MSVC) |
| 183 | workspace for building libpng and zlib | 183 | workspace for building libpng and zlib |
| 184 | visualc71 => Contains a Microsoft Visual C++ (MSVC) | 184 | visualc71 => Contains a Microsoft Visual C++ (MSVC) |
| 185 | workspace for building libpng and zlib | 185 | workspace for building libpng and zlib |
| 186 | xcode => Contains an Apple xcode | 186 | xcode => Contains an Apple xcode |
| 187 | workspace for building libpng and zlib | 187 | workspace for building libpng and zlib |
| 188 | scripts => Directory containing scripts for building libpng: | 188 | scripts => Directory containing scripts for building libpng: |
| 189 | (see scripts/README.txt for the list of scripts) | 189 | (see scripts/README.txt for the list of scripts) |
| 190 | 190 | ||
| 191 | Good luck, and happy coding. | 191 | Good luck, and happy coding. |
| 192 | 192 | ||
| 193 | -Glenn Randers-Pehrson (current maintainer, since 1998) | 193 | -Glenn Randers-Pehrson (current maintainer, since 1998) |
| 194 | Internet: glennrp at users.sourceforge.net | 194 | Internet: glennrp at users.sourceforge.net |
| 195 | 195 | ||
| 196 | -Andreas Eric Dilger (former maintainer, 1996-1997) | 196 | -Andreas Eric Dilger (former maintainer, 1996-1997) |
| 197 | Internet: adilger at enel.ucalgary.ca | 197 | Internet: adilger at enel.ucalgary.ca |
| 198 | Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/ | 198 | Web: http://www-mddsp.enel.ucalgary.ca/People/adilger/ |
| 199 | 199 | ||
| 200 | -Guy Eric Schalnat (original author and former maintainer, 1995-1996) | 200 | -Guy Eric Schalnat (original author and former maintainer, 1995-1996) |
| 201 | (formerly of Group 42, Inc) | 201 | (formerly of Group 42, Inc) |
| 202 | Internet: gschal at infinet.com | 202 | Internet: gschal at infinet.com |