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author | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
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committer | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
commit | 393b5cd1dc438872af89d334ef6e5fcc59f27d47 (patch) | |
tree | 6a14521219942a08a1b95cb2f5a923a9edd60f63 /libraries/irrlicht-1.8/source/Irrlicht/libpng/png.h | |
parent | Add a note about rasters suggested start up code. (diff) | |
download | SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.zip SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.gz SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.bz2 SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.xz |
Added Irrlicht 1.8, but without all the Windows binaries.
Diffstat (limited to '')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/libpng/png.h | 2658 |
1 files changed, 2658 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/libpng/png.h b/libraries/irrlicht-1.8/source/Irrlicht/libpng/png.h new file mode 100644 index 0000000..8126767 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/libpng/png.h | |||
@@ -0,0 +1,2658 @@ | |||
1 | |||
2 | /* png.h - header file for PNG reference library | ||
3 | * | ||
4 | * libpng version 1.5.9 - February 18, 2012 | ||
5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson | ||
6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | ||
7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | ||
8 | * | ||
9 | * This code is released under the libpng license (See LICENSE, below) | ||
10 | * | ||
11 | * Authors and maintainers: | ||
12 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat | ||
13 | * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger | ||
14 | * libpng versions 0.97, January 1998, through 1.5.9 - February 18, 2012: Glenn | ||
15 | * See also "Contributing Authors", below. | ||
16 | * | ||
17 | * Note about libpng version numbers: | ||
18 | * | ||
19 | * Due to various miscommunications, unforeseen code incompatibilities | ||
20 | * and occasional factors outside the authors' control, version numbering | ||
21 | * on the library has not always been consistent and straightforward. | ||
22 | * The following table summarizes matters since version 0.89c, which was | ||
23 | * the first widely used release: | ||
24 | * | ||
25 | * source png.h png.h shared-lib | ||
26 | * version string int version | ||
27 | * ------- ------ ----- ---------- | ||
28 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89 | ||
29 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] | ||
30 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] | ||
31 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] | ||
32 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] | ||
33 | * 0.97c 0.97 97 2.0.97 | ||
34 | * 0.98 0.98 98 2.0.98 | ||
35 | * 0.99 0.99 98 2.0.99 | ||
36 | * 0.99a-m 0.99 99 2.0.99 | ||
37 | * 1.00 1.00 100 2.1.0 [100 should be 10000] | ||
38 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] | ||
39 | * 1.0.1 png.h string is 10001 2.1.0 | ||
40 | * 1.0.1a-e identical to the 10002 from here on, the shared library | ||
41 | * 1.0.2 source version) 10002 is 2.V where V is the source code | ||
42 | * 1.0.2a-b 10003 version, except as noted. | ||
43 | * 1.0.3 10003 | ||
44 | * 1.0.3a-d 10004 | ||
45 | * 1.0.4 10004 | ||
46 | * 1.0.4a-f 10005 | ||
47 | * 1.0.5 (+ 2 patches) 10005 | ||
48 | * 1.0.5a-d 10006 | ||
49 | * 1.0.5e-r 10100 (not source compatible) | ||
50 | * 1.0.5s-v 10006 (not binary compatible) | ||
51 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) | ||
52 | * 1.0.6d-f 10007 (still binary incompatible) | ||
53 | * 1.0.6g 10007 | ||
54 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering) | ||
55 | * 1.0.6i 10007 10.6i | ||
56 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) | ||
57 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) | ||
58 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) | ||
59 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) | ||
60 | * 1.0.7 1 10007 (still compatible) | ||
61 | * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 | ||
62 | * 1.0.8rc1 1 10008 2.1.0.8rc1 | ||
63 | * 1.0.8 1 10008 2.1.0.8 | ||
64 | * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 | ||
65 | * 1.0.9rc1 1 10009 2.1.0.9rc1 | ||
66 | * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 | ||
67 | * 1.0.9rc2 1 10009 2.1.0.9rc2 | ||
68 | * 1.0.9 1 10009 2.1.0.9 | ||
69 | * 1.0.10beta1 1 10010 2.1.0.10beta1 | ||
70 | * 1.0.10rc1 1 10010 2.1.0.10rc1 | ||
71 | * 1.0.10 1 10010 2.1.0.10 | ||
72 | * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 | ||
73 | * 1.0.11rc1 1 10011 2.1.0.11rc1 | ||
74 | * 1.0.11 1 10011 2.1.0.11 | ||
75 | * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 | ||
76 | * 1.0.12rc1 2 10012 2.1.0.12rc1 | ||
77 | * 1.0.12 2 10012 2.1.0.12 | ||
78 | * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) | ||
79 | * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 | ||
80 | * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 | ||
81 | * 1.2.0rc1 3 10200 3.1.2.0rc1 | ||
82 | * 1.2.0 3 10200 3.1.2.0 | ||
83 | * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 | ||
84 | * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 | ||
85 | * 1.2.1 3 10201 3.1.2.1 | ||
86 | * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 | ||
87 | * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 | ||
88 | * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 | ||
89 | * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 | ||
90 | * 1.0.13 10 10013 10.so.0.1.0.13 | ||
91 | * 1.2.2 12 10202 12.so.0.1.2.2 | ||
92 | * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 | ||
93 | * 1.2.3 12 10203 12.so.0.1.2.3 | ||
94 | * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 | ||
95 | * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 | ||
96 | * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 | ||
97 | * 1.0.14 10 10014 10.so.0.1.0.14 | ||
98 | * 1.2.4 13 10204 12.so.0.1.2.4 | ||
99 | * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 | ||
100 | * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 | ||
101 | * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 | ||
102 | * 1.0.15 10 10015 10.so.0.1.0.15 | ||
103 | * 1.2.5 13 10205 12.so.0.1.2.5 | ||
104 | * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 | ||
105 | * 1.0.16 10 10016 10.so.0.1.0.16 | ||
106 | * 1.2.6 13 10206 12.so.0.1.2.6 | ||
107 | * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 | ||
108 | * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 | ||
109 | * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 | ||
110 | * 1.0.17 10 10017 12.so.0.1.0.17 | ||
111 | * 1.2.7 13 10207 12.so.0.1.2.7 | ||
112 | * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 | ||
113 | * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 | ||
114 | * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 | ||
115 | * 1.0.18 10 10018 12.so.0.1.0.18 | ||
116 | * 1.2.8 13 10208 12.so.0.1.2.8 | ||
117 | * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 | ||
118 | * 1.2.9beta4-11 13 10209 12.so.0.9[.0] | ||
119 | * 1.2.9rc1 13 10209 12.so.0.9[.0] | ||
120 | * 1.2.9 13 10209 12.so.0.9[.0] | ||
121 | * 1.2.10beta1-7 13 10210 12.so.0.10[.0] | ||
122 | * 1.2.10rc1-2 13 10210 12.so.0.10[.0] | ||
123 | * 1.2.10 13 10210 12.so.0.10[.0] | ||
124 | * 1.4.0beta1-5 14 10400 14.so.0.0[.0] | ||
125 | * 1.2.11beta1-4 13 10211 12.so.0.11[.0] | ||
126 | * 1.4.0beta7-8 14 10400 14.so.0.0[.0] | ||
127 | * 1.2.11 13 10211 12.so.0.11[.0] | ||
128 | * 1.2.12 13 10212 12.so.0.12[.0] | ||
129 | * 1.4.0beta9-14 14 10400 14.so.0.0[.0] | ||
130 | * 1.2.13 13 10213 12.so.0.13[.0] | ||
131 | * 1.4.0beta15-36 14 10400 14.so.0.0[.0] | ||
132 | * 1.4.0beta37-87 14 10400 14.so.14.0[.0] | ||
133 | * 1.4.0rc01 14 10400 14.so.14.0[.0] | ||
134 | * 1.4.0beta88-109 14 10400 14.so.14.0[.0] | ||
135 | * 1.4.0rc02-08 14 10400 14.so.14.0[.0] | ||
136 | * 1.4.0 14 10400 14.so.14.0[.0] | ||
137 | * 1.4.1beta01-03 14 10401 14.so.14.1[.0] | ||
138 | * 1.4.1rc01 14 10401 14.so.14.1[.0] | ||
139 | * 1.4.1beta04-12 14 10401 14.so.14.1[.0] | ||
140 | * 1.4.1 14 10401 14.so.14.1[.0] | ||
141 | * 1.4.2 14 10402 14.so.14.2[.0] | ||
142 | * 1.4.3 14 10403 14.so.14.3[.0] | ||
143 | * 1.4.4 14 10404 14.so.14.4[.0] | ||
144 | * 1.5.0beta01-58 15 10500 15.so.15.0[.0] | ||
145 | * 1.5.0rc01-07 15 10500 15.so.15.0[.0] | ||
146 | * 1.5.0 15 10500 15.so.15.0[.0] | ||
147 | * 1.5.1beta01-11 15 10501 15.so.15.1[.0] | ||
148 | * 1.5.1rc01-02 15 10501 15.so.15.1[.0] | ||
149 | * 1.5.1 15 10501 15.so.15.1[.0] | ||
150 | * 1.5.2beta01-03 15 10502 15.so.15.2[.0] | ||
151 | * 1.5.2rc01-03 15 10502 15.so.15.2[.0] | ||
152 | * 1.5.2 15 10502 15.so.15.2[.0] | ||
153 | * 1.5.3beta01-10 15 10503 15.so.15.3[.0] | ||
154 | * 1.5.3rc01-02 15 10503 15.so.15.3[.0] | ||
155 | * 1.5.3beta11 15 10503 15.so.15.3[.0] | ||
156 | * 1.5.3 [omitted] | ||
157 | * 1.5.4beta01-08 15 10504 15.so.15.4[.0] | ||
158 | * 1.5.4rc01 15 10504 15.so.15.4[.0] | ||
159 | * 1.5.4 15 10504 15.so.15.4[.0] | ||
160 | * 1.5.5beta01-08 15 10505 15.so.15.5[.0] | ||
161 | * 1.5.5rc01 15 10505 15.so.15.5[.0] | ||
162 | * 1.5.5 15 10505 15.so.15.5[.0] | ||
163 | * 1.5.6beta01-07 15 10506 15.so.15.6[.0] | ||
164 | * 1.5.6rc01-03 15 10506 15.so.15.6[.0] | ||
165 | * 1.5.6 15 10506 15.so.15.6[.0] | ||
166 | * 1.5.7beta01-05 15 10507 15.so.15.7[.0] | ||
167 | * 1.5.7rc01-03 15 10507 15.so.15.7[.0] | ||
168 | * 1.5.7 15 10507 15.so.15.7[.0] | ||
169 | * 1.5.8beta01 15 10508 15.so.15.8[.0] | ||
170 | * 1.5.8rc01 15 10508 15.so.15.8[.0] | ||
171 | * 1.5.8 15 10508 15.so.15.8[.0] | ||
172 | * 1.5.9beta01-02 15 10509 15.so.15.9[.0] | ||
173 | * 1.5.9rc01 15 10509 15.so.15.9[.0] | ||
174 | * 1.5.9 15 10509 15.so.15.9[.0] | ||
175 | * | ||
176 | * Henceforth the source version will match the shared-library major | ||
177 | * and minor numbers; the shared-library major version number will be | ||
178 | * used for changes in backward compatibility, as it is intended. The | ||
179 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available | ||
180 | * for applications, is an unsigned integer of the form xyyzz corresponding | ||
181 | * to the source version x.y.z (leading zeros in y and z). Beta versions | ||
182 | * were given the previous public release number plus a letter, until | ||
183 | * version 1.0.6j; from then on they were given the upcoming public | ||
184 | * release number plus "betaNN" or "rcN". | ||
185 | * | ||
186 | * Binary incompatibility exists only when applications make direct access | ||
187 | * to the info_ptr or png_ptr members through png.h, and the compiled | ||
188 | * application is loaded with a different version of the library. | ||
189 | * | ||
190 | * DLLNUM will change each time there are forward or backward changes | ||
191 | * in binary compatibility (e.g., when a new feature is added). | ||
192 | * | ||
193 | * See libpng-manual.txt or libpng.3 for more information. The PNG | ||
194 | * specification is available as a W3C Recommendation and as an ISO | ||
195 | * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ | ||
196 | */ | ||
197 | |||
198 | /* | ||
199 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: | ||
200 | * | ||
201 | * If you modify libpng you may insert additional notices immediately following | ||
202 | * this sentence. | ||
203 | * | ||
204 | * This code is released under the libpng license. | ||
205 | * | ||
206 | * libpng versions 1.2.6, August 15, 2004, through 1.5.9, February 18, 2012, are | ||
207 | * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are | ||
208 | * distributed according to the same disclaimer and license as libpng-1.2.5 | ||
209 | * with the following individual added to the list of Contributing Authors: | ||
210 | * | ||
211 | * Cosmin Truta | ||
212 | * | ||
213 | * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are | ||
214 | * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are | ||
215 | * distributed according to the same disclaimer and license as libpng-1.0.6 | ||
216 | * with the following individuals added to the list of Contributing Authors: | ||
217 | * | ||
218 | * Simon-Pierre Cadieux | ||
219 | * Eric S. Raymond | ||
220 | * Gilles Vollant | ||
221 | * | ||
222 | * and with the following additions to the disclaimer: | ||
223 | * | ||
224 | * There is no warranty against interference with your enjoyment of the | ||
225 | * library or against infringement. There is no warranty that our | ||
226 | * efforts or the library will fulfill any of your particular purposes | ||
227 | * or needs. This library is provided with all faults, and the entire | ||
228 | * risk of satisfactory quality, performance, accuracy, and effort is with | ||
229 | * the user. | ||
230 | * | ||
231 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are | ||
232 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are | ||
233 | * distributed according to the same disclaimer and license as libpng-0.96, | ||
234 | * with the following individuals added to the list of Contributing Authors: | ||
235 | * | ||
236 | * Tom Lane | ||
237 | * Glenn Randers-Pehrson | ||
238 | * Willem van Schaik | ||
239 | * | ||
240 | * libpng versions 0.89, June 1996, through 0.96, May 1997, are | ||
241 | * Copyright (c) 1996, 1997 Andreas Dilger | ||
242 | * Distributed according to the same disclaimer and license as libpng-0.88, | ||
243 | * with the following individuals added to the list of Contributing Authors: | ||
244 | * | ||
245 | * John Bowler | ||
246 | * Kevin Bracey | ||
247 | * Sam Bushell | ||
248 | * Magnus Holmgren | ||
249 | * Greg Roelofs | ||
250 | * Tom Tanner | ||
251 | * | ||
252 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are | ||
253 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. | ||
254 | * | ||
255 | * For the purposes of this copyright and license, "Contributing Authors" | ||
256 | * is defined as the following set of individuals: | ||
257 | * | ||
258 | * Andreas Dilger | ||
259 | * Dave Martindale | ||
260 | * Guy Eric Schalnat | ||
261 | * Paul Schmidt | ||
262 | * Tim Wegner | ||
263 | * | ||
264 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors | ||
265 | * and Group 42, Inc. disclaim all warranties, expressed or implied, | ||
266 | * including, without limitation, the warranties of merchantability and of | ||
267 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. | ||
268 | * assume no liability for direct, indirect, incidental, special, exemplary, | ||
269 | * or consequential damages, which may result from the use of the PNG | ||
270 | * Reference Library, even if advised of the possibility of such damage. | ||
271 | * | ||
272 | * Permission is hereby granted to use, copy, modify, and distribute this | ||
273 | * source code, or portions hereof, for any purpose, without fee, subject | ||
274 | * to the following restrictions: | ||
275 | * | ||
276 | * 1. The origin of this source code must not be misrepresented. | ||
277 | * | ||
278 | * 2. Altered versions must be plainly marked as such and must not | ||
279 | * be misrepresented as being the original source. | ||
280 | * | ||
281 | * 3. This Copyright notice may not be removed or altered from | ||
282 | * any source or altered source distribution. | ||
283 | * | ||
284 | * The Contributing Authors and Group 42, Inc. specifically permit, without | ||
285 | * fee, and encourage the use of this source code as a component to | ||
286 | * supporting the PNG file format in commercial products. If you use this | ||
287 | * source code in a product, acknowledgment is not required but would be | ||
288 | * appreciated. | ||
289 | */ | ||
290 | |||
291 | /* | ||
292 | * A "png_get_copyright" function is available, for convenient use in "about" | ||
293 | * boxes and the like: | ||
294 | * | ||
295 | * printf("%s", png_get_copyright(NULL)); | ||
296 | * | ||
297 | * Also, the PNG logo (in PNG format, of course) is supplied in the | ||
298 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). | ||
299 | */ | ||
300 | |||
301 | /* | ||
302 | * Libpng is OSI Certified Open Source Software. OSI Certified is a | ||
303 | * certification mark of the Open Source Initiative. | ||
304 | */ | ||
305 | |||
306 | /* | ||
307 | * The contributing authors would like to thank all those who helped | ||
308 | * with testing, bug fixes, and patience. This wouldn't have been | ||
309 | * possible without all of you. | ||
310 | * | ||
311 | * Thanks to Frank J. T. Wojcik for helping with the documentation. | ||
312 | */ | ||
313 | |||
314 | /* | ||
315 | * Y2K compliance in libpng: | ||
316 | * ========================= | ||
317 | * | ||
318 | * February 18, 2012 | ||
319 | * | ||
320 | * Since the PNG Development group is an ad-hoc body, we can't make | ||
321 | * an official declaration. | ||
322 | * | ||
323 | * This is your unofficial assurance that libpng from version 0.71 and | ||
324 | * upward through 1.5.9 are Y2K compliant. It is my belief that | ||
325 | * earlier versions were also Y2K compliant. | ||
326 | * | ||
327 | * Libpng only has two year fields. One is a 2-byte unsigned integer | ||
328 | * that will hold years up to 65535. The other holds the date in text | ||
329 | * format, and will hold years up to 9999. | ||
330 | * | ||
331 | * The integer is | ||
332 | * "png_uint_16 year" in png_time_struct. | ||
333 | * | ||
334 | * The string is | ||
335 | * "png_char time_buffer" in png_struct | ||
336 | * | ||
337 | * There are seven time-related functions: | ||
338 | * png.c: png_convert_to_rfc_1123() in png.c | ||
339 | * (formerly png_convert_to_rfc_1152() in error) | ||
340 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c | ||
341 | * png_convert_from_time_t() in pngwrite.c | ||
342 | * png_get_tIME() in pngget.c | ||
343 | * png_handle_tIME() in pngrutil.c, called in pngread.c | ||
344 | * png_set_tIME() in pngset.c | ||
345 | * png_write_tIME() in pngwutil.c, called in pngwrite.c | ||
346 | * | ||
347 | * All handle dates properly in a Y2K environment. The | ||
348 | * png_convert_from_time_t() function calls gmtime() to convert from system | ||
349 | * clock time, which returns (year - 1900), which we properly convert to | ||
350 | * the full 4-digit year. There is a possibility that applications using | ||
351 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() | ||
352 | * function, or that they are incorrectly passing only a 2-digit year | ||
353 | * instead of "year - 1900" into the png_convert_from_struct_tm() function, | ||
354 | * but this is not under our control. The libpng documentation has always | ||
355 | * stated that it works with 4-digit years, and the APIs have been | ||
356 | * documented as such. | ||
357 | * | ||
358 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned | ||
359 | * integer to hold the year, and can hold years as large as 65535. | ||
360 | * | ||
361 | * zlib, upon which libpng depends, is also Y2K compliant. It contains | ||
362 | * no date-related code. | ||
363 | * | ||
364 | * Glenn Randers-Pehrson | ||
365 | * libpng maintainer | ||
366 | * PNG Development Group | ||
367 | */ | ||
368 | |||
369 | #ifndef PNG_H | ||
370 | #define PNG_H | ||
371 | |||
372 | /* This is not the place to learn how to use libpng. The file libpng-manual.txt | ||
373 | * describes how to use libpng, and the file example.c summarizes it | ||
374 | * with some code on which to build. This file is useful for looking | ||
375 | * at the actual function definitions and structure components. | ||
376 | * | ||
377 | * If you just need to read a PNG file and don't want to read the documentation | ||
378 | * skip to the end of this file and read the section entitled 'simplified API'. | ||
379 | */ | ||
380 | |||
381 | /* Version information for png.h - this should match the version in png.c */ | ||
382 | #define PNG_LIBPNG_VER_STRING "1.5.9" | ||
383 | #define PNG_HEADER_VERSION_STRING \ | ||
384 | " libpng version 1.5.9 - February 18, 2012\n" | ||
385 | |||
386 | #define PNG_LIBPNG_VER_SONUM 15 | ||
387 | #define PNG_LIBPNG_VER_DLLNUM 15 | ||
388 | |||
389 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ | ||
390 | #define PNG_LIBPNG_VER_MAJOR 1 | ||
391 | #define PNG_LIBPNG_VER_MINOR 5 | ||
392 | #define PNG_LIBPNG_VER_RELEASE 9 | ||
393 | |||
394 | /* This should match the numeric part of the final component of | ||
395 | * PNG_LIBPNG_VER_STRING, omitting any leading zero: | ||
396 | */ | ||
397 | |||
398 | #define PNG_LIBPNG_VER_BUILD 0 | ||
399 | |||
400 | /* Release Status */ | ||
401 | #define PNG_LIBPNG_BUILD_ALPHA 1 | ||
402 | #define PNG_LIBPNG_BUILD_BETA 2 | ||
403 | #define PNG_LIBPNG_BUILD_RC 3 | ||
404 | #define PNG_LIBPNG_BUILD_STABLE 4 | ||
405 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 | ||
406 | |||
407 | /* Release-Specific Flags */ | ||
408 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with | ||
409 | PNG_LIBPNG_BUILD_STABLE only */ | ||
410 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with | ||
411 | PNG_LIBPNG_BUILD_SPECIAL */ | ||
412 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with | ||
413 | PNG_LIBPNG_BUILD_PRIVATE */ | ||
414 | |||
415 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA | ||
416 | |||
417 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. | ||
418 | * We must not include leading zeros. | ||
419 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only | ||
420 | * version 1.0.0 was mis-numbered 100 instead of 10000). From | ||
421 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release | ||
422 | */ | ||
423 | #define PNG_LIBPNG_VER 10509 /* 1.5.9 */ | ||
424 | |||
425 | /* Library configuration: these options cannot be changed after | ||
426 | * the library has been built. | ||
427 | */ | ||
428 | #ifndef PNGLCONF_H | ||
429 | /* If pnglibconf.h is missing, you can | ||
430 | * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h | ||
431 | */ | ||
432 | # include "pnglibconf.h" | ||
433 | #endif | ||
434 | |||
435 | #ifndef PNG_VERSION_INFO_ONLY | ||
436 | # ifndef PNG_BUILDING_SYMBOL_TABLE | ||
437 | /* | ||
438 | * Standard header files (not needed for the version info or while | ||
439 | * building symbol table -- see scripts/pnglibconf.dfa) | ||
440 | */ | ||
441 | # ifdef PNG_SETJMP_SUPPORTED | ||
442 | # include <setjmp.h> | ||
443 | # endif | ||
444 | |||
445 | /* Need the time information for converting tIME chunks, it | ||
446 | * defines struct tm: | ||
447 | */ | ||
448 | # ifdef PNG_CONVERT_tIME_SUPPORTED | ||
449 | /* "time.h" functions are not supported on all operating systems */ | ||
450 | # include <time.h> | ||
451 | # endif | ||
452 | # endif | ||
453 | |||
454 | /* Machine specific configuration. */ | ||
455 | # include "pngconf.h" | ||
456 | #endif | ||
457 | |||
458 | /* | ||
459 | * Added at libpng-1.2.8 | ||
460 | * | ||
461 | * Ref MSDN: Private as priority over Special | ||
462 | * VS_FF_PRIVATEBUILD File *was not* built using standard release | ||
463 | * procedures. If this value is given, the StringFileInfo block must | ||
464 | * contain a PrivateBuild string. | ||
465 | * | ||
466 | * VS_FF_SPECIALBUILD File *was* built by the original company using | ||
467 | * standard release procedures but is a variation of the standard | ||
468 | * file of the same version number. If this value is given, the | ||
469 | * StringFileInfo block must contain a SpecialBuild string. | ||
470 | */ | ||
471 | |||
472 | #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ | ||
473 | # define PNG_LIBPNG_BUILD_TYPE \ | ||
474 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) | ||
475 | #else | ||
476 | # ifdef PNG_LIBPNG_SPECIALBUILD | ||
477 | # define PNG_LIBPNG_BUILD_TYPE \ | ||
478 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) | ||
479 | # else | ||
480 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) | ||
481 | # endif | ||
482 | #endif | ||
483 | |||
484 | #ifndef PNG_VERSION_INFO_ONLY | ||
485 | |||
486 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ | ||
487 | #ifdef __cplusplus | ||
488 | extern "C" { | ||
489 | #endif /* __cplusplus */ | ||
490 | |||
491 | /* Version information for C files, stored in png.c. This had better match | ||
492 | * the version above. | ||
493 | */ | ||
494 | #define png_libpng_ver png_get_header_ver(NULL) | ||
495 | |||
496 | /* This file is arranged in several sections: | ||
497 | * | ||
498 | * 1. Any configuration options that can be specified by for the application | ||
499 | * code when it is built. (Build time configuration is in pnglibconf.h) | ||
500 | * 2. Type definitions (base types are defined in pngconf.h), structure | ||
501 | * definitions. | ||
502 | * 3. Exported library functions. | ||
503 | * | ||
504 | * The library source code has additional files (principally pngpriv.h) that | ||
505 | * allow configuration of the library. | ||
506 | */ | ||
507 | /* Section 1: run time configuration | ||
508 | * See pnglibconf.h for build time configuration | ||
509 | * | ||
510 | * Run time configuration allows the application to choose between | ||
511 | * implementations of certain arithmetic APIs. The default is set | ||
512 | * at build time and recorded in pnglibconf.h, but it is safe to | ||
513 | * override these (and only these) settings. Note that this won't | ||
514 | * change what the library does, only application code, and the | ||
515 | * settings can (and probably should) be made on a per-file basis | ||
516 | * by setting the #defines before including png.h | ||
517 | * | ||
518 | * Use macros to read integers from PNG data or use the exported | ||
519 | * functions? | ||
520 | * PNG_USE_READ_MACROS: use the macros (see below) Note that | ||
521 | * the macros evaluate their argument multiple times. | ||
522 | * PNG_NO_USE_READ_MACROS: call the relevant library function. | ||
523 | * | ||
524 | * Use the alternative algorithm for compositing alpha samples that | ||
525 | * does not use division? | ||
526 | * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' | ||
527 | * algorithm. | ||
528 | * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. | ||
529 | * | ||
530 | * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is | ||
531 | * false? | ||
532 | * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error | ||
533 | * APIs to png_warning. | ||
534 | * Otherwise the calls are mapped to png_error. | ||
535 | */ | ||
536 | |||
537 | /* Section 2: type definitions, including structures and compile time | ||
538 | * constants. | ||
539 | * See pngconf.h for base types that vary by machine/system | ||
540 | */ | ||
541 | |||
542 | /* This triggers a compiler error in png.c, if png.c and png.h | ||
543 | * do not agree upon the version number. | ||
544 | */ | ||
545 | typedef char* png_libpng_version_1_5_9; | ||
546 | |||
547 | /* Three color definitions. The order of the red, green, and blue, (and the | ||
548 | * exact size) is not important, although the size of the fields need to | ||
549 | * be png_byte or png_uint_16 (as defined below). | ||
550 | */ | ||
551 | typedef struct png_color_struct | ||
552 | { | ||
553 | png_byte red; | ||
554 | png_byte green; | ||
555 | png_byte blue; | ||
556 | } png_color; | ||
557 | typedef png_color FAR * png_colorp; | ||
558 | typedef PNG_CONST png_color FAR * png_const_colorp; | ||
559 | typedef png_color FAR * FAR * png_colorpp; | ||
560 | |||
561 | typedef struct png_color_16_struct | ||
562 | { | ||
563 | png_byte index; /* used for palette files */ | ||
564 | png_uint_16 red; /* for use in red green blue files */ | ||
565 | png_uint_16 green; | ||
566 | png_uint_16 blue; | ||
567 | png_uint_16 gray; /* for use in grayscale files */ | ||
568 | } png_color_16; | ||
569 | typedef png_color_16 FAR * png_color_16p; | ||
570 | typedef PNG_CONST png_color_16 FAR * png_const_color_16p; | ||
571 | typedef png_color_16 FAR * FAR * png_color_16pp; | ||
572 | |||
573 | typedef struct png_color_8_struct | ||
574 | { | ||
575 | png_byte red; /* for use in red green blue files */ | ||
576 | png_byte green; | ||
577 | png_byte blue; | ||
578 | png_byte gray; /* for use in grayscale files */ | ||
579 | png_byte alpha; /* for alpha channel files */ | ||
580 | } png_color_8; | ||
581 | typedef png_color_8 FAR * png_color_8p; | ||
582 | typedef PNG_CONST png_color_8 FAR * png_const_color_8p; | ||
583 | typedef png_color_8 FAR * FAR * png_color_8pp; | ||
584 | |||
585 | /* | ||
586 | * The following two structures are used for the in-core representation | ||
587 | * of sPLT chunks. | ||
588 | */ | ||
589 | typedef struct png_sPLT_entry_struct | ||
590 | { | ||
591 | png_uint_16 red; | ||
592 | png_uint_16 green; | ||
593 | png_uint_16 blue; | ||
594 | png_uint_16 alpha; | ||
595 | png_uint_16 frequency; | ||
596 | } png_sPLT_entry; | ||
597 | typedef png_sPLT_entry FAR * png_sPLT_entryp; | ||
598 | typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp; | ||
599 | typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; | ||
600 | |||
601 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples | ||
602 | * occupy the LSB of their respective members, and the MSB of each member | ||
603 | * is zero-filled. The frequency member always occupies the full 16 bits. | ||
604 | */ | ||
605 | |||
606 | typedef struct png_sPLT_struct | ||
607 | { | ||
608 | png_charp name; /* palette name */ | ||
609 | png_byte depth; /* depth of palette samples */ | ||
610 | png_sPLT_entryp entries; /* palette entries */ | ||
611 | png_int_32 nentries; /* number of palette entries */ | ||
612 | } png_sPLT_t; | ||
613 | typedef png_sPLT_t FAR * png_sPLT_tp; | ||
614 | typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; | ||
615 | typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; | ||
616 | |||
617 | #ifdef PNG_TEXT_SUPPORTED | ||
618 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, | ||
619 | * and whether that contents is compressed or not. The "key" field | ||
620 | * points to a regular zero-terminated C string. The "text" fields can be a | ||
621 | * regular C string, an empty string, or a NULL pointer. | ||
622 | * However, the structure returned by png_get_text() will always contain | ||
623 | * the "text" field as a regular zero-terminated C string (possibly | ||
624 | * empty), never a NULL pointer, so it can be safely used in printf() and | ||
625 | * other string-handling functions. Note that the "itxt_length", "lang", and | ||
626 | * "lang_key" members of the structure only exist when the library is built | ||
627 | * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by | ||
628 | * default without iTXt support. Also note that when iTXt *is* supported, | ||
629 | * the "lang" and "lang_key" fields contain NULL pointers when the | ||
630 | * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or | ||
631 | * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the | ||
632 | * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" | ||
633 | * which is always 0 or 1, or its "compression method" which is always 0. | ||
634 | */ | ||
635 | typedef struct png_text_struct | ||
636 | { | ||
637 | int compression; /* compression value: | ||
638 | -1: tEXt, none | ||
639 | 0: zTXt, deflate | ||
640 | 1: iTXt, none | ||
641 | 2: iTXt, deflate */ | ||
642 | png_charp key; /* keyword, 1-79 character description of "text" */ | ||
643 | png_charp text; /* comment, may be an empty string (ie "") | ||
644 | or a NULL pointer */ | ||
645 | png_size_t text_length; /* length of the text string */ | ||
646 | png_size_t itxt_length; /* length of the itxt string */ | ||
647 | png_charp lang; /* language code, 0-79 characters | ||
648 | or a NULL pointer */ | ||
649 | png_charp lang_key; /* keyword translated UTF-8 string, 0 or more | ||
650 | chars or a NULL pointer */ | ||
651 | } png_text; | ||
652 | typedef png_text FAR * png_textp; | ||
653 | typedef PNG_CONST png_text FAR * png_const_textp; | ||
654 | typedef png_text FAR * FAR * png_textpp; | ||
655 | #endif | ||
656 | |||
657 | /* Supported compression types for text in PNG files (tEXt, and zTXt). | ||
658 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ | ||
659 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 | ||
660 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 | ||
661 | #define PNG_TEXT_COMPRESSION_NONE -1 | ||
662 | #define PNG_TEXT_COMPRESSION_zTXt 0 | ||
663 | #define PNG_ITXT_COMPRESSION_NONE 1 | ||
664 | #define PNG_ITXT_COMPRESSION_zTXt 2 | ||
665 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ | ||
666 | |||
667 | /* png_time is a way to hold the time in an machine independent way. | ||
668 | * Two conversions are provided, both from time_t and struct tm. There | ||
669 | * is no portable way to convert to either of these structures, as far | ||
670 | * as I know. If you know of a portable way, send it to me. As a side | ||
671 | * note - PNG has always been Year 2000 compliant! | ||
672 | */ | ||
673 | typedef struct png_time_struct | ||
674 | { | ||
675 | png_uint_16 year; /* full year, as in, 1995 */ | ||
676 | png_byte month; /* month of year, 1 - 12 */ | ||
677 | png_byte day; /* day of month, 1 - 31 */ | ||
678 | png_byte hour; /* hour of day, 0 - 23 */ | ||
679 | png_byte minute; /* minute of hour, 0 - 59 */ | ||
680 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ | ||
681 | } png_time; | ||
682 | typedef png_time FAR * png_timep; | ||
683 | typedef PNG_CONST png_time FAR * png_const_timep; | ||
684 | typedef png_time FAR * FAR * png_timepp; | ||
685 | |||
686 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ | ||
687 | defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) | ||
688 | /* png_unknown_chunk is a structure to hold queued chunks for which there is | ||
689 | * no specific support. The idea is that we can use this to queue | ||
690 | * up private chunks for output even though the library doesn't actually | ||
691 | * know about their semantics. | ||
692 | */ | ||
693 | typedef struct png_unknown_chunk_t | ||
694 | { | ||
695 | png_byte name[5]; | ||
696 | png_byte *data; | ||
697 | png_size_t size; | ||
698 | |||
699 | /* libpng-using applications should NOT directly modify this byte. */ | ||
700 | png_byte location; /* mode of operation at read time */ | ||
701 | } | ||
702 | |||
703 | |||
704 | png_unknown_chunk; | ||
705 | typedef png_unknown_chunk FAR * png_unknown_chunkp; | ||
706 | typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; | ||
707 | typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; | ||
708 | #endif | ||
709 | |||
710 | /* Values for the unknown chunk location byte */ | ||
711 | |||
712 | #define PNG_HAVE_IHDR 0x01 | ||
713 | #define PNG_HAVE_PLTE 0x02 | ||
714 | #define PNG_AFTER_IDAT 0x08 | ||
715 | |||
716 | /* The complete definition of png_info has, as of libpng-1.5.0, | ||
717 | * been moved into a separate header file that is not accessible to | ||
718 | * applications. Read libpng-manual.txt or libpng.3 for more info. | ||
719 | */ | ||
720 | typedef struct png_info_def png_info; | ||
721 | typedef png_info FAR * png_infop; | ||
722 | typedef PNG_CONST png_info FAR * png_const_infop; | ||
723 | typedef png_info FAR * FAR * png_infopp; | ||
724 | |||
725 | /* Maximum positive integer used in PNG is (2^31)-1 */ | ||
726 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) | ||
727 | #define PNG_UINT_32_MAX ((png_uint_32)(-1)) | ||
728 | #define PNG_SIZE_MAX ((png_size_t)(-1)) | ||
729 | |||
730 | /* These are constants for fixed point values encoded in the | ||
731 | * PNG specification manner (x100000) | ||
732 | */ | ||
733 | #define PNG_FP_1 100000 | ||
734 | #define PNG_FP_HALF 50000 | ||
735 | #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) | ||
736 | #define PNG_FP_MIN (-PNG_FP_MAX) | ||
737 | |||
738 | /* These describe the color_type field in png_info. */ | ||
739 | /* color type masks */ | ||
740 | #define PNG_COLOR_MASK_PALETTE 1 | ||
741 | #define PNG_COLOR_MASK_COLOR 2 | ||
742 | #define PNG_COLOR_MASK_ALPHA 4 | ||
743 | |||
744 | /* color types. Note that not all combinations are legal */ | ||
745 | #define PNG_COLOR_TYPE_GRAY 0 | ||
746 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) | ||
747 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) | ||
748 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) | ||
749 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) | ||
750 | /* aliases */ | ||
751 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA | ||
752 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA | ||
753 | |||
754 | /* This is for compression type. PNG 1.0-1.2 only define the single type. */ | ||
755 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ | ||
756 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE | ||
757 | |||
758 | /* This is for filter type. PNG 1.0-1.2 only define the single type. */ | ||
759 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ | ||
760 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ | ||
761 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE | ||
762 | |||
763 | /* These are for the interlacing type. These values should NOT be changed. */ | ||
764 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ | ||
765 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ | ||
766 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ | ||
767 | |||
768 | /* These are for the oFFs chunk. These values should NOT be changed. */ | ||
769 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ | ||
770 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ | ||
771 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ | ||
772 | |||
773 | /* These are for the pCAL chunk. These values should NOT be changed. */ | ||
774 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ | ||
775 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ | ||
776 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ | ||
777 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ | ||
778 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ | ||
779 | |||
780 | /* These are for the sCAL chunk. These values should NOT be changed. */ | ||
781 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ | ||
782 | #define PNG_SCALE_METER 1 /* meters per pixel */ | ||
783 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */ | ||
784 | #define PNG_SCALE_LAST 3 /* Not a valid value */ | ||
785 | |||
786 | /* These are for the pHYs chunk. These values should NOT be changed. */ | ||
787 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ | ||
788 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ | ||
789 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ | ||
790 | |||
791 | /* These are for the sRGB chunk. These values should NOT be changed. */ | ||
792 | #define PNG_sRGB_INTENT_PERCEPTUAL 0 | ||
793 | #define PNG_sRGB_INTENT_RELATIVE 1 | ||
794 | #define PNG_sRGB_INTENT_SATURATION 2 | ||
795 | #define PNG_sRGB_INTENT_ABSOLUTE 3 | ||
796 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ | ||
797 | |||
798 | /* This is for text chunks */ | ||
799 | #define PNG_KEYWORD_MAX_LENGTH 79 | ||
800 | |||
801 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ | ||
802 | #define PNG_MAX_PALETTE_LENGTH 256 | ||
803 | |||
804 | /* These determine if an ancillary chunk's data has been successfully read | ||
805 | * from the PNG header, or if the application has filled in the corresponding | ||
806 | * data in the info_struct to be written into the output file. The values | ||
807 | * of the PNG_INFO_<chunk> defines should NOT be changed. | ||
808 | */ | ||
809 | #define PNG_INFO_gAMA 0x0001 | ||
810 | #define PNG_INFO_sBIT 0x0002 | ||
811 | #define PNG_INFO_cHRM 0x0004 | ||
812 | #define PNG_INFO_PLTE 0x0008 | ||
813 | #define PNG_INFO_tRNS 0x0010 | ||
814 | #define PNG_INFO_bKGD 0x0020 | ||
815 | #define PNG_INFO_hIST 0x0040 | ||
816 | #define PNG_INFO_pHYs 0x0080 | ||
817 | #define PNG_INFO_oFFs 0x0100 | ||
818 | #define PNG_INFO_tIME 0x0200 | ||
819 | #define PNG_INFO_pCAL 0x0400 | ||
820 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ | ||
821 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ | ||
822 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ | ||
823 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ | ||
824 | #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ | ||
825 | |||
826 | /* This is used for the transformation routines, as some of them | ||
827 | * change these values for the row. It also should enable using | ||
828 | * the routines for other purposes. | ||
829 | */ | ||
830 | typedef struct png_row_info_struct | ||
831 | { | ||
832 | png_uint_32 width; /* width of row */ | ||
833 | png_size_t rowbytes; /* number of bytes in row */ | ||
834 | png_byte color_type; /* color type of row */ | ||
835 | png_byte bit_depth; /* bit depth of row */ | ||
836 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ | ||
837 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ | ||
838 | } png_row_info; | ||
839 | |||
840 | typedef png_row_info FAR * png_row_infop; | ||
841 | typedef png_row_info FAR * FAR * png_row_infopp; | ||
842 | |||
843 | /* The complete definition of png_struct has, as of libpng-1.5.0, | ||
844 | * been moved into a separate header file that is not accessible to | ||
845 | * applications. Read libpng-manual.txt or libpng.3 for more info. | ||
846 | */ | ||
847 | typedef struct png_struct_def png_struct; | ||
848 | typedef PNG_CONST png_struct FAR * png_const_structp; | ||
849 | typedef png_struct FAR * png_structp; | ||
850 | |||
851 | /* These are the function types for the I/O functions and for the functions | ||
852 | * that allow the user to override the default I/O functions with his or her | ||
853 | * own. The png_error_ptr type should match that of user-supplied warning | ||
854 | * and error functions, while the png_rw_ptr type should match that of the | ||
855 | * user read/write data functions. Note that the 'write' function must not | ||
856 | * modify the buffer it is passed. The 'read' function, on the other hand, is | ||
857 | * expected to return the read data in the buffer. | ||
858 | */ | ||
859 | typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); | ||
860 | typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); | ||
861 | typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); | ||
862 | typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, | ||
863 | int)); | ||
864 | typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, | ||
865 | int)); | ||
866 | |||
867 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | ||
868 | typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); | ||
869 | typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); | ||
870 | |||
871 | /* The following callback receives png_uint_32 row_number, int pass for the | ||
872 | * png_bytep data of the row. When transforming an interlaced image the | ||
873 | * row number is the row number within the sub-image of the interlace pass, so | ||
874 | * the value will increase to the height of the sub-image (not the full image) | ||
875 | * then reset to 0 for the next pass. | ||
876 | * | ||
877 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to | ||
878 | * find the output pixel (x,y) given an interlaced sub-image pixel | ||
879 | * (row,col,pass). (See below for these macros.) | ||
880 | */ | ||
881 | typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, | ||
882 | png_uint_32, int)); | ||
883 | #endif | ||
884 | |||
885 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ | ||
886 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) | ||
887 | typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, | ||
888 | png_bytep)); | ||
889 | #endif | ||
890 | |||
891 | #ifdef PNG_USER_CHUNKS_SUPPORTED | ||
892 | typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, | ||
893 | png_unknown_chunkp)); | ||
894 | #endif | ||
895 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED | ||
896 | typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); | ||
897 | #endif | ||
898 | |||
899 | #ifdef PNG_SETJMP_SUPPORTED | ||
900 | /* This must match the function definition in <setjmp.h>, and the application | ||
901 | * must include this before png.h to obtain the definition of jmp_buf. The | ||
902 | * function is required to be PNG_NORETURN, but this is not checked. If the | ||
903 | * function does return the application will crash via an abort() or similar | ||
904 | * system level call. | ||
905 | * | ||
906 | * If you get a warning here while building the library you may need to make | ||
907 | * changes to ensure that pnglibconf.h records the calling convention used by | ||
908 | * your compiler. This may be very difficult - try using a different compiler | ||
909 | * to build the library! | ||
910 | */ | ||
911 | PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); | ||
912 | #endif | ||
913 | |||
914 | /* Transform masks for the high-level interface */ | ||
915 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ | ||
916 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ | ||
917 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ | ||
918 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ | ||
919 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ | ||
920 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ | ||
921 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ | ||
922 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ | ||
923 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ | ||
924 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ | ||
925 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ | ||
926 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ | ||
927 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ | ||
928 | /* Added to libpng-1.2.34 */ | ||
929 | #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER | ||
930 | #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ | ||
931 | /* Added to libpng-1.4.0 */ | ||
932 | #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ | ||
933 | /* Added to libpng-1.5.4 */ | ||
934 | #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ | ||
935 | #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ | ||
936 | |||
937 | /* Flags for MNG supported features */ | ||
938 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 | ||
939 | #define PNG_FLAG_MNG_FILTER_64 0x04 | ||
940 | #define PNG_ALL_MNG_FEATURES 0x05 | ||
941 | |||
942 | /* NOTE: prior to 1.5 these functions had no 'API' style declaration, | ||
943 | * this allowed the zlib default functions to be used on Windows | ||
944 | * platforms. In 1.5 the zlib default malloc (which just calls malloc and | ||
945 | * ignores the first argument) should be completely compatible with the | ||
946 | * following. | ||
947 | */ | ||
948 | typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, | ||
949 | png_alloc_size_t)); | ||
950 | typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); | ||
951 | |||
952 | typedef png_struct FAR * FAR * png_structpp; | ||
953 | |||
954 | /* Section 3: exported functions | ||
955 | * Here are the function definitions most commonly used. This is not | ||
956 | * the place to find out how to use libpng. See libpng-manual.txt for the | ||
957 | * full explanation, see example.c for the summary. This just provides | ||
958 | * a simple one line description of the use of each function. | ||
959 | * | ||
960 | * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in | ||
961 | * pngconf.h and in the *.dfn files in the scripts directory. | ||
962 | * | ||
963 | * PNG_EXPORT(ordinal, type, name, (args)); | ||
964 | * | ||
965 | * ordinal: ordinal that is used while building | ||
966 | * *.def files. The ordinal value is only | ||
967 | * relevant when preprocessing png.h with | ||
968 | * the *.dfn files for building symbol table | ||
969 | * entries, and are removed by pngconf.h. | ||
970 | * type: return type of the function | ||
971 | * name: function name | ||
972 | * args: function arguments, with types | ||
973 | * | ||
974 | * When we wish to append attributes to a function prototype we use | ||
975 | * the PNG_EXPORTA() macro instead. | ||
976 | * | ||
977 | * PNG_EXPORTA(ordinal, type, name, (args), attributes); | ||
978 | * | ||
979 | * ordinal, type, name, and args: same as in PNG_EXPORT(). | ||
980 | * attributes: function attributes | ||
981 | */ | ||
982 | |||
983 | /* Returns the version number of the library */ | ||
984 | PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); | ||
985 | |||
986 | /* Tell lib we have already handled the first <num_bytes> magic bytes. | ||
987 | * Handling more than 8 bytes from the beginning of the file is an error. | ||
988 | */ | ||
989 | PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); | ||
990 | |||
991 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a | ||
992 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG | ||
993 | * signature, and non-zero otherwise. Having num_to_check == 0 or | ||
994 | * start > 7 will always fail (ie return non-zero). | ||
995 | */ | ||
996 | PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, | ||
997 | png_size_t num_to_check)); | ||
998 | |||
999 | /* Simple signature checking function. This is the same as calling | ||
1000 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). | ||
1001 | */ | ||
1002 | #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) | ||
1003 | |||
1004 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */ | ||
1005 | PNG_EXPORTA(4, png_structp, png_create_read_struct, | ||
1006 | (png_const_charp user_png_ver, png_voidp error_ptr, | ||
1007 | png_error_ptr error_fn, png_error_ptr warn_fn), | ||
1008 | PNG_ALLOCATED); | ||
1009 | |||
1010 | /* Allocate and initialize png_ptr struct for writing, and any other memory */ | ||
1011 | PNG_EXPORTA(5, png_structp, png_create_write_struct, | ||
1012 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | ||
1013 | png_error_ptr warn_fn), | ||
1014 | PNG_ALLOCATED); | ||
1015 | |||
1016 | PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, | ||
1017 | (png_const_structp png_ptr)); | ||
1018 | |||
1019 | PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, | ||
1020 | png_size_t size)); | ||
1021 | |||
1022 | /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp | ||
1023 | * match up. | ||
1024 | */ | ||
1025 | #ifdef PNG_SETJMP_SUPPORTED | ||
1026 | /* This function returns the jmp_buf built in to *png_ptr. It must be | ||
1027 | * supplied with an appropriate 'longjmp' function to use on that jmp_buf | ||
1028 | * unless the default error function is overridden in which case NULL is | ||
1029 | * acceptable. The size of the jmp_buf is checked against the actual size | ||
1030 | * allocated by the library - the call will return NULL on a mismatch | ||
1031 | * indicating an ABI mismatch. | ||
1032 | */ | ||
1033 | PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, | ||
1034 | png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); | ||
1035 | # define png_jmpbuf(png_ptr) \ | ||
1036 | (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) | ||
1037 | #else | ||
1038 | # define png_jmpbuf(png_ptr) \ | ||
1039 | (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) | ||
1040 | #endif | ||
1041 | /* This function should be used by libpng applications in place of | ||
1042 | * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it | ||
1043 | * will use it; otherwise it will call PNG_ABORT(). This function was | ||
1044 | * added in libpng-1.5.0. | ||
1045 | */ | ||
1046 | PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val), | ||
1047 | PNG_NORETURN); | ||
1048 | |||
1049 | #ifdef PNG_READ_SUPPORTED | ||
1050 | /* Reset the compression stream */ | ||
1051 | PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); | ||
1052 | #endif | ||
1053 | |||
1054 | /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ | ||
1055 | #ifdef PNG_USER_MEM_SUPPORTED | ||
1056 | PNG_EXPORTA(11, png_structp, png_create_read_struct_2, | ||
1057 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | ||
1058 | png_error_ptr warn_fn, | ||
1059 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), | ||
1060 | PNG_ALLOCATED); | ||
1061 | PNG_EXPORTA(12, png_structp, png_create_write_struct_2, | ||
1062 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | ||
1063 | png_error_ptr warn_fn, | ||
1064 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), | ||
1065 | PNG_ALLOCATED); | ||
1066 | #endif | ||
1067 | |||
1068 | /* Write the PNG file signature. */ | ||
1069 | PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr)); | ||
1070 | |||
1071 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ | ||
1072 | PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep | ||
1073 | chunk_name, png_const_bytep data, png_size_t length)); | ||
1074 | |||
1075 | /* Write the start of a PNG chunk - length and chunk name. */ | ||
1076 | PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, | ||
1077 | png_const_bytep chunk_name, png_uint_32 length)); | ||
1078 | |||
1079 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ | ||
1080 | PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, | ||
1081 | png_const_bytep data, png_size_t length)); | ||
1082 | |||
1083 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ | ||
1084 | PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); | ||
1085 | |||
1086 | /* Allocate and initialize the info structure */ | ||
1087 | PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), | ||
1088 | PNG_ALLOCATED); | ||
1089 | |||
1090 | PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, | ||
1091 | png_size_t png_info_struct_size)); | ||
1092 | |||
1093 | /* Writes all the PNG information before the image. */ | ||
1094 | PNG_EXPORT(20, void, png_write_info_before_PLTE, | ||
1095 | (png_structp png_ptr, png_infop info_ptr)); | ||
1096 | PNG_EXPORT(21, void, png_write_info, | ||
1097 | (png_structp png_ptr, png_infop info_ptr)); | ||
1098 | |||
1099 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | ||
1100 | /* Read the information before the actual image data. */ | ||
1101 | PNG_EXPORT(22, void, png_read_info, | ||
1102 | (png_structp png_ptr, png_infop info_ptr)); | ||
1103 | #endif | ||
1104 | |||
1105 | #ifdef PNG_TIME_RFC1123_SUPPORTED | ||
1106 | PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, | ||
1107 | (png_structp png_ptr, | ||
1108 | png_const_timep ptime)); | ||
1109 | #endif | ||
1110 | |||
1111 | #ifdef PNG_CONVERT_tIME_SUPPORTED | ||
1112 | /* Convert from a struct tm to png_time */ | ||
1113 | PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, | ||
1114 | PNG_CONST struct tm FAR * ttime)); | ||
1115 | |||
1116 | /* Convert from time_t to png_time. Uses gmtime() */ | ||
1117 | PNG_EXPORT(25, void, png_convert_from_time_t, | ||
1118 | (png_timep ptime, time_t ttime)); | ||
1119 | #endif /* PNG_CONVERT_tIME_SUPPORTED */ | ||
1120 | |||
1121 | #ifdef PNG_READ_EXPAND_SUPPORTED | ||
1122 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ | ||
1123 | PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr)); | ||
1124 | PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr)); | ||
1125 | PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); | ||
1126 | PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); | ||
1127 | #endif | ||
1128 | |||
1129 | #ifdef PNG_READ_EXPAND_16_SUPPORTED | ||
1130 | /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion | ||
1131 | * of a tRNS chunk if present. | ||
1132 | */ | ||
1133 | PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr)); | ||
1134 | #endif | ||
1135 | |||
1136 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | ||
1137 | /* Use blue, green, red order for pixels. */ | ||
1138 | PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); | ||
1139 | #endif | ||
1140 | |||
1141 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED | ||
1142 | /* Expand the grayscale to 24-bit RGB if necessary. */ | ||
1143 | PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); | ||
1144 | #endif | ||
1145 | |||
1146 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | ||
1147 | /* Reduce RGB to grayscale. */ | ||
1148 | #define PNG_ERROR_ACTION_NONE 1 | ||
1149 | #define PNG_ERROR_ACTION_WARN 2 | ||
1150 | #define PNG_ERROR_ACTION_ERROR 3 | ||
1151 | #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ | ||
1152 | |||
1153 | PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, | ||
1154 | int error_action, double red, double green)); | ||
1155 | PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, | ||
1156 | int error_action, png_fixed_point red, png_fixed_point green)); | ||
1157 | |||
1158 | PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp | ||
1159 | png_ptr)); | ||
1160 | #endif | ||
1161 | |||
1162 | #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED | ||
1163 | PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, | ||
1164 | png_colorp palette)); | ||
1165 | #endif | ||
1166 | |||
1167 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED | ||
1168 | /* How the alpha channel is interpreted - this affects how the color channels of | ||
1169 | * a PNG file are returned when an alpha channel, or tRNS chunk in a palette | ||
1170 | * file, is present. | ||
1171 | * | ||
1172 | * This has no effect on the way pixels are written into a PNG output | ||
1173 | * datastream. The color samples in a PNG datastream are never premultiplied | ||
1174 | * with the alpha samples. | ||
1175 | * | ||
1176 | * The default is to return data according to the PNG specification: the alpha | ||
1177 | * channel is a linear measure of the contribution of the pixel to the | ||
1178 | * corresponding composited pixel. The gamma encoded color channels must be | ||
1179 | * scaled according to the contribution and to do this it is necessary to undo | ||
1180 | * the encoding, scale the color values, perform the composition and reencode | ||
1181 | * the values. This is the 'PNG' mode. | ||
1182 | * | ||
1183 | * The alternative is to 'associate' the alpha with the color information by | ||
1184 | * storing color channel values that have been scaled by the alpha. The | ||
1185 | * advantage is that the color channels can be resampled (the image can be | ||
1186 | * scaled) in this form. The disadvantage is that normal practice is to store | ||
1187 | * linear, not (gamma) encoded, values and this requires 16-bit channels for | ||
1188 | * still images rather than the 8-bit channels that are just about sufficient if | ||
1189 | * gamma encoding is used. In addition all non-transparent pixel values, | ||
1190 | * including completely opaque ones, must be gamma encoded to produce the final | ||
1191 | * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the | ||
1192 | * latter being the two common names for associated alpha color channels.) | ||
1193 | * | ||
1194 | * Since it is not necessary to perform arithmetic on opaque color values so | ||
1195 | * long as they are not to be resampled and are in the final color space it is | ||
1196 | * possible to optimize the handling of alpha by storing the opaque pixels in | ||
1197 | * the PNG format (adjusted for the output color space) while storing partially | ||
1198 | * opaque pixels in the standard, linear, format. The accuracy required for | ||
1199 | * standard alpha composition is relatively low, because the pixels are | ||
1200 | * isolated, therefore typically the accuracy loss in storing 8-bit linear | ||
1201 | * values is acceptable. (This is not true if the alpha channel is used to | ||
1202 | * simulate transparency over large areas - use 16 bits or the PNG mode in | ||
1203 | * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is | ||
1204 | * treated as opaque only if the alpha value is equal to the maximum value. | ||
1205 | * | ||
1206 | * The final choice is to gamma encode the alpha channel as well. This is | ||
1207 | * broken because, in practice, no implementation that uses this choice | ||
1208 | * correctly undoes the encoding before handling alpha composition. Use this | ||
1209 | * choice only if other serious errors in the software or hardware you use | ||
1210 | * mandate it; the typical serious error is for dark halos to appear around | ||
1211 | * opaque areas of the composited PNG image because of arithmetic overflow. | ||
1212 | * | ||
1213 | * The API function png_set_alpha_mode specifies which of these choices to use | ||
1214 | * with an enumerated 'mode' value and the gamma of the required output: | ||
1215 | */ | ||
1216 | #define PNG_ALPHA_PNG 0 /* according to the PNG standard */ | ||
1217 | #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ | ||
1218 | #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ | ||
1219 | #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ | ||
1220 | #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ | ||
1221 | #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ | ||
1222 | |||
1223 | PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode, | ||
1224 | double output_gamma)); | ||
1225 | PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr, | ||
1226 | int mode, png_fixed_point output_gamma)); | ||
1227 | #endif | ||
1228 | |||
1229 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) | ||
1230 | /* The output_gamma value is a screen gamma in libpng terminology: it expresses | ||
1231 | * how to decode the output values, not how they are encoded. The values used | ||
1232 | * correspond to the normal numbers used to describe the overall gamma of a | ||
1233 | * computer display system; for example 2.2 for an sRGB conformant system. The | ||
1234 | * values are scaled by 100000 in the _fixed version of the API (so 220000 for | ||
1235 | * sRGB.) | ||
1236 | * | ||
1237 | * The inverse of the value is always used to provide a default for the PNG file | ||
1238 | * encoding if it has no gAMA chunk and if png_set_gamma() has not been called | ||
1239 | * to override the PNG gamma information. | ||
1240 | * | ||
1241 | * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode | ||
1242 | * opaque pixels however pixels with lower alpha values are not encoded, | ||
1243 | * regardless of the output gamma setting. | ||
1244 | * | ||
1245 | * When the standard Porter Duff handling is requested with mode 1 the output | ||
1246 | * encoding is set to be linear and the output_gamma value is only relevant | ||
1247 | * as a default for input data that has no gamma information. The linear output | ||
1248 | * encoding will be overridden if png_set_gamma() is called - the results may be | ||
1249 | * highly unexpected! | ||
1250 | * | ||
1251 | * The following numbers are derived from the sRGB standard and the research | ||
1252 | * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of | ||
1253 | * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing | ||
1254 | * correction required to take account of any differences in the color | ||
1255 | * environment of the original scene and the intended display environment; the | ||
1256 | * value expresses how to *decode* the image for display, not how the original | ||
1257 | * data was *encoded*. | ||
1258 | * | ||
1259 | * sRGB provides a peg for the PNG standard by defining a viewing environment. | ||
1260 | * sRGB itself, and earlier TV standards, actually use a more complex transform | ||
1261 | * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is | ||
1262 | * limited to simple power laws.) By saying that an image for direct display on | ||
1263 | * an sRGB conformant system should be stored with a gAMA chunk value of 45455 | ||
1264 | * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification | ||
1265 | * makes it possible to derive values for other display systems and | ||
1266 | * environments. | ||
1267 | * | ||
1268 | * The Mac value is deduced from the sRGB based on an assumption that the actual | ||
1269 | * extra viewing correction used in early Mac display systems was implemented as | ||
1270 | * a power 1.45 lookup table. | ||
1271 | * | ||
1272 | * Any system where a programmable lookup table is used or where the behavior of | ||
1273 | * the final display device characteristics can be changed requires system | ||
1274 | * specific code to obtain the current characteristic. However this can be | ||
1275 | * difficult and most PNG gamma correction only requires an approximate value. | ||
1276 | * | ||
1277 | * By default, if png_set_alpha_mode() is not called, libpng assumes that all | ||
1278 | * values are unencoded, linear, values and that the output device also has a | ||
1279 | * linear characteristic. This is only very rarely correct - it is invariably | ||
1280 | * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the | ||
1281 | * default if you don't know what the right answer is! | ||
1282 | * | ||
1283 | * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS | ||
1284 | * 10.6) which used a correction table to implement a somewhat lower gamma on an | ||
1285 | * otherwise sRGB system. | ||
1286 | * | ||
1287 | * Both these values are reserved (not simple gamma values) in order to allow | ||
1288 | * more precise correction internally in the future. | ||
1289 | * | ||
1290 | * NOTE: the following values can be passed to either the fixed or floating | ||
1291 | * point APIs, but the floating point API will also accept floating point | ||
1292 | * values. | ||
1293 | */ | ||
1294 | #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ | ||
1295 | #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ | ||
1296 | #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ | ||
1297 | #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ | ||
1298 | #endif | ||
1299 | |||
1300 | /* The following are examples of calls to png_set_alpha_mode to achieve the | ||
1301 | * required overall gamma correction and, where necessary, alpha | ||
1302 | * premultiplication. | ||
1303 | * | ||
1304 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); | ||
1305 | * This is the default libpng handling of the alpha channel - it is not | ||
1306 | * pre-multiplied into the color components. In addition the call states | ||
1307 | * that the output is for a sRGB system and causes all PNG files without gAMA | ||
1308 | * chunks to be assumed to be encoded using sRGB. | ||
1309 | * | ||
1310 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); | ||
1311 | * In this case the output is assumed to be something like an sRGB conformant | ||
1312 | * display preceeded by a power-law lookup table of power 1.45. This is how | ||
1313 | * early Mac systems behaved. | ||
1314 | * | ||
1315 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); | ||
1316 | * This is the classic Jim Blinn approach and will work in academic | ||
1317 | * environments where everything is done by the book. It has the shortcoming | ||
1318 | * of assuming that input PNG data with no gamma information is linear - this | ||
1319 | * is unlikely to be correct unless the PNG files where generated locally. | ||
1320 | * Most of the time the output precision will be so low as to show | ||
1321 | * significant banding in dark areas of the image. | ||
1322 | * | ||
1323 | * png_set_expand_16(pp); | ||
1324 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); | ||
1325 | * This is a somewhat more realistic Jim Blinn inspired approach. PNG files | ||
1326 | * are assumed to have the sRGB encoding if not marked with a gamma value and | ||
1327 | * the output is always 16 bits per component. This permits accurate scaling | ||
1328 | * and processing of the data. If you know that your input PNG files were | ||
1329 | * generated locally you might need to replace PNG_DEFAULT_sRGB with the | ||
1330 | * correct value for your system. | ||
1331 | * | ||
1332 | * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); | ||
1333 | * If you just need to composite the PNG image onto an existing background | ||
1334 | * and if you control the code that does this you can use the optimization | ||
1335 | * setting. In this case you just copy completely opaque pixels to the | ||
1336 | * output. For pixels that are not completely transparent (you just skip | ||
1337 | * those) you do the composition math using png_composite or png_composite_16 | ||
1338 | * below then encode the resultant 8-bit or 16-bit values to match the output | ||
1339 | * encoding. | ||
1340 | * | ||
1341 | * Other cases | ||
1342 | * If neither the PNG nor the standard linear encoding work for you because | ||
1343 | * of the software or hardware you use then you have a big problem. The PNG | ||
1344 | * case will probably result in halos around the image. The linear encoding | ||
1345 | * will probably result in a washed out, too bright, image (it's actually too | ||
1346 | * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably | ||
1347 | * substantially reduce the halos. Alternatively try: | ||
1348 | * | ||
1349 | * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); | ||
1350 | * This option will also reduce the halos, but there will be slight dark | ||
1351 | * halos round the opaque parts of the image where the background is light. | ||
1352 | * In the OPTIMIZED mode the halos will be light halos where the background | ||
1353 | * is dark. Take your pick - the halos are unavoidable unless you can get | ||
1354 | * your hardware/software fixed! (The OPTIMIZED approach is slightly | ||
1355 | * faster.) | ||
1356 | * | ||
1357 | * When the default gamma of PNG files doesn't match the output gamma. | ||
1358 | * If you have PNG files with no gamma information png_set_alpha_mode allows | ||
1359 | * you to provide a default gamma, but it also sets the ouput gamma to the | ||
1360 | * matching value. If you know your PNG files have a gamma that doesn't | ||
1361 | * match the output you can take advantage of the fact that | ||
1362 | * png_set_alpha_mode always sets the output gamma but only sets the PNG | ||
1363 | * default if it is not already set: | ||
1364 | * | ||
1365 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); | ||
1366 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); | ||
1367 | * The first call sets both the default and the output gamma values, the | ||
1368 | * second call overrides the output gamma without changing the default. This | ||
1369 | * is easier than achieving the same effect with png_set_gamma. You must use | ||
1370 | * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will | ||
1371 | * fire if more than one call to png_set_alpha_mode and png_set_background is | ||
1372 | * made in the same read operation, however multiple calls with PNG_ALPHA_PNG | ||
1373 | * are ignored. | ||
1374 | */ | ||
1375 | |||
1376 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED | ||
1377 | PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); | ||
1378 | #endif | ||
1379 | |||
1380 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ | ||
1381 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) | ||
1382 | PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr)); | ||
1383 | #endif | ||
1384 | |||
1385 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ | ||
1386 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) | ||
1387 | PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr)); | ||
1388 | #endif | ||
1389 | |||
1390 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) | ||
1391 | /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ | ||
1392 | PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, | ||
1393 | int flags)); | ||
1394 | /* The values of the PNG_FILLER_ defines should NOT be changed */ | ||
1395 | # define PNG_FILLER_BEFORE 0 | ||
1396 | # define PNG_FILLER_AFTER 1 | ||
1397 | /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ | ||
1398 | PNG_EXPORT(40, void, png_set_add_alpha, | ||
1399 | (png_structp png_ptr, png_uint_32 filler, | ||
1400 | int flags)); | ||
1401 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ | ||
1402 | |||
1403 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | ||
1404 | /* Swap bytes in 16-bit depth files. */ | ||
1405 | PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr)); | ||
1406 | #endif | ||
1407 | |||
1408 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) | ||
1409 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ | ||
1410 | PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr)); | ||
1411 | #endif | ||
1412 | |||
1413 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ | ||
1414 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) | ||
1415 | /* Swap packing order of pixels in bytes. */ | ||
1416 | PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr)); | ||
1417 | #endif | ||
1418 | |||
1419 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) | ||
1420 | /* Converts files to legal bit depths. */ | ||
1421 | PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p | ||
1422 | true_bits)); | ||
1423 | #endif | ||
1424 | |||
1425 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ | ||
1426 | defined(PNG_WRITE_INTERLACING_SUPPORTED) | ||
1427 | /* Have the code handle the interlacing. Returns the number of passes. | ||
1428 | * MUST be called before png_read_update_info or png_start_read_image, | ||
1429 | * otherwise it will not have the desired effect. Note that it is still | ||
1430 | * necessary to call png_read_row or png_read_rows png_get_image_height | ||
1431 | * times for each pass. | ||
1432 | */ | ||
1433 | PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr)); | ||
1434 | #endif | ||
1435 | |||
1436 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) | ||
1437 | /* Invert monochrome files */ | ||
1438 | PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr)); | ||
1439 | #endif | ||
1440 | |||
1441 | #ifdef PNG_READ_BACKGROUND_SUPPORTED | ||
1442 | /* Handle alpha and tRNS by replacing with a background color. Prior to | ||
1443 | * libpng-1.5.4 this API must not be called before the PNG file header has been | ||
1444 | * read. Doing so will result in unexpected behavior and possible warnings or | ||
1445 | * errors if the PNG file contains a bKGD chunk. | ||
1446 | */ | ||
1447 | PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, | ||
1448 | png_const_color_16p background_color, int background_gamma_code, | ||
1449 | int need_expand, double background_gamma)); | ||
1450 | PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, | ||
1451 | png_const_color_16p background_color, int background_gamma_code, | ||
1452 | int need_expand, png_fixed_point background_gamma)); | ||
1453 | #endif | ||
1454 | #ifdef PNG_READ_BACKGROUND_SUPPORTED | ||
1455 | # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 | ||
1456 | # define PNG_BACKGROUND_GAMMA_SCREEN 1 | ||
1457 | # define PNG_BACKGROUND_GAMMA_FILE 2 | ||
1458 | # define PNG_BACKGROUND_GAMMA_UNIQUE 3 | ||
1459 | #endif | ||
1460 | |||
1461 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED | ||
1462 | /* Scale a 16-bit depth file down to 8-bit, accurately. */ | ||
1463 | PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr)); | ||
1464 | #endif | ||
1465 | |||
1466 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED | ||
1467 | #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ | ||
1468 | /* Strip the second byte of information from a 16-bit depth file. */ | ||
1469 | PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr)); | ||
1470 | #endif | ||
1471 | |||
1472 | #ifdef PNG_READ_QUANTIZE_SUPPORTED | ||
1473 | /* Turn on quantizing, and reduce the palette to the number of colors | ||
1474 | * available. | ||
1475 | */ | ||
1476 | PNG_EXPORT(49, void, png_set_quantize, | ||
1477 | (png_structp png_ptr, png_colorp palette, | ||
1478 | int num_palette, int maximum_colors, png_const_uint_16p histogram, | ||
1479 | int full_quantize)); | ||
1480 | #endif | ||
1481 | |||
1482 | #ifdef PNG_READ_GAMMA_SUPPORTED | ||
1483 | /* The threshold on gamma processing is configurable but hard-wired into the | ||
1484 | * library. The following is the floating point variant. | ||
1485 | */ | ||
1486 | #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) | ||
1487 | |||
1488 | /* Handle gamma correction. Screen_gamma=(display_exponent). | ||
1489 | * NOTE: this API simply sets the screen and file gamma values. It will | ||
1490 | * therefore override the value for gamma in a PNG file if it is called after | ||
1491 | * the file header has been read - use with care - call before reading the PNG | ||
1492 | * file for best results! | ||
1493 | * | ||
1494 | * These routines accept the same gamma values as png_set_alpha_mode (described | ||
1495 | * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either | ||
1496 | * API (floating point or fixed.) Notice, however, that the 'file_gamma' value | ||
1497 | * is the inverse of a 'screen gamma' value. | ||
1498 | */ | ||
1499 | PNG_FP_EXPORT(50, void, png_set_gamma, | ||
1500 | (png_structp png_ptr, double screen_gamma, | ||
1501 | double override_file_gamma)); | ||
1502 | PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, | ||
1503 | png_fixed_point screen_gamma, png_fixed_point override_file_gamma)); | ||
1504 | #endif | ||
1505 | |||
1506 | #ifdef PNG_WRITE_FLUSH_SUPPORTED | ||
1507 | /* Set how many lines between output flushes - 0 for no flushing */ | ||
1508 | PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows)); | ||
1509 | /* Flush the current PNG output buffer */ | ||
1510 | PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr)); | ||
1511 | #endif | ||
1512 | |||
1513 | /* Optional update palette with requested transformations */ | ||
1514 | PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr)); | ||
1515 | |||
1516 | /* Optional call to update the users info structure */ | ||
1517 | PNG_EXPORT(54, void, png_read_update_info, | ||
1518 | (png_structp png_ptr, png_infop info_ptr)); | ||
1519 | |||
1520 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | ||
1521 | /* Read one or more rows of image data. */ | ||
1522 | PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, | ||
1523 | png_bytepp display_row, png_uint_32 num_rows)); | ||
1524 | #endif | ||
1525 | |||
1526 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | ||
1527 | /* Read a row of data. */ | ||
1528 | PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, | ||
1529 | png_bytep display_row)); | ||
1530 | #endif | ||
1531 | |||
1532 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | ||
1533 | /* Read the whole image into memory at once. */ | ||
1534 | PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image)); | ||
1535 | #endif | ||
1536 | |||
1537 | /* Write a row of image data */ | ||
1538 | PNG_EXPORT(58, void, png_write_row, | ||
1539 | (png_structp png_ptr, png_const_bytep row)); | ||
1540 | |||
1541 | /* Write a few rows of image data: (*row) is not written; however, the type | ||
1542 | * is declared as writeable to maintain compatibility with previous versions | ||
1543 | * of libpng and to allow the 'display_row' array from read_rows to be passed | ||
1544 | * unchanged to write_rows. | ||
1545 | */ | ||
1546 | PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, | ||
1547 | png_uint_32 num_rows)); | ||
1548 | |||
1549 | /* Write the image data */ | ||
1550 | PNG_EXPORT(60, void, png_write_image, | ||
1551 | (png_structp png_ptr, png_bytepp image)); | ||
1552 | |||
1553 | /* Write the end of the PNG file. */ | ||
1554 | PNG_EXPORT(61, void, png_write_end, | ||
1555 | (png_structp png_ptr, png_infop info_ptr)); | ||
1556 | |||
1557 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | ||
1558 | /* Read the end of the PNG file. */ | ||
1559 | PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr)); | ||
1560 | #endif | ||
1561 | |||
1562 | /* Free any memory associated with the png_info_struct */ | ||
1563 | PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, | ||
1564 | png_infopp info_ptr_ptr)); | ||
1565 | |||
1566 | /* Free any memory associated with the png_struct and the png_info_structs */ | ||
1567 | PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, | ||
1568 | png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); | ||
1569 | |||
1570 | /* Free any memory associated with the png_struct and the png_info_structs */ | ||
1571 | PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, | ||
1572 | png_infopp info_ptr_ptr)); | ||
1573 | |||
1574 | /* Set the libpng method of handling chunk CRC errors */ | ||
1575 | PNG_EXPORT(66, void, png_set_crc_action, | ||
1576 | (png_structp png_ptr, int crit_action, int ancil_action)); | ||
1577 | |||
1578 | /* Values for png_set_crc_action() say how to handle CRC errors in | ||
1579 | * ancillary and critical chunks, and whether to use the data contained | ||
1580 | * therein. Note that it is impossible to "discard" data in a critical | ||
1581 | * chunk. For versions prior to 0.90, the action was always error/quit, | ||
1582 | * whereas in version 0.90 and later, the action for CRC errors in ancillary | ||
1583 | * chunks is warn/discard. These values should NOT be changed. | ||
1584 | * | ||
1585 | * value action:critical action:ancillary | ||
1586 | */ | ||
1587 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ | ||
1588 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ | ||
1589 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ | ||
1590 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ | ||
1591 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ | ||
1592 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ | ||
1593 | |||
1594 | /* These functions give the user control over the scan-line filtering in | ||
1595 | * libpng and the compression methods used by zlib. These functions are | ||
1596 | * mainly useful for testing, as the defaults should work with most users. | ||
1597 | * Those users who are tight on memory or want faster performance at the | ||
1598 | * expense of compression can modify them. See the compression library | ||
1599 | * header file (zlib.h) for an explination of the compression functions. | ||
1600 | */ | ||
1601 | |||
1602 | /* Set the filtering method(s) used by libpng. Currently, the only valid | ||
1603 | * value for "method" is 0. | ||
1604 | */ | ||
1605 | PNG_EXPORT(67, void, png_set_filter, | ||
1606 | (png_structp png_ptr, int method, int filters)); | ||
1607 | |||
1608 | /* Flags for png_set_filter() to say which filters to use. The flags | ||
1609 | * are chosen so that they don't conflict with real filter types | ||
1610 | * below, in case they are supplied instead of the #defined constants. | ||
1611 | * These values should NOT be changed. | ||
1612 | */ | ||
1613 | #define PNG_NO_FILTERS 0x00 | ||
1614 | #define PNG_FILTER_NONE 0x08 | ||
1615 | #define PNG_FILTER_SUB 0x10 | ||
1616 | #define PNG_FILTER_UP 0x20 | ||
1617 | #define PNG_FILTER_AVG 0x40 | ||
1618 | #define PNG_FILTER_PAETH 0x80 | ||
1619 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ | ||
1620 | PNG_FILTER_AVG | PNG_FILTER_PAETH) | ||
1621 | |||
1622 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. | ||
1623 | * These defines should NOT be changed. | ||
1624 | */ | ||
1625 | #define PNG_FILTER_VALUE_NONE 0 | ||
1626 | #define PNG_FILTER_VALUE_SUB 1 | ||
1627 | #define PNG_FILTER_VALUE_UP 2 | ||
1628 | #define PNG_FILTER_VALUE_AVG 3 | ||
1629 | #define PNG_FILTER_VALUE_PAETH 4 | ||
1630 | #define PNG_FILTER_VALUE_LAST 5 | ||
1631 | |||
1632 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ | ||
1633 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ | ||
1634 | * defines, either the default (minimum-sum-of-absolute-differences), or | ||
1635 | * the experimental method (weighted-minimum-sum-of-absolute-differences). | ||
1636 | * | ||
1637 | * Weights are factors >= 1.0, indicating how important it is to keep the | ||
1638 | * filter type consistent between rows. Larger numbers mean the current | ||
1639 | * filter is that many times as likely to be the same as the "num_weights" | ||
1640 | * previous filters. This is cumulative for each previous row with a weight. | ||
1641 | * There needs to be "num_weights" values in "filter_weights", or it can be | ||
1642 | * NULL if the weights aren't being specified. Weights have no influence on | ||
1643 | * the selection of the first row filter. Well chosen weights can (in theory) | ||
1644 | * improve the compression for a given image. | ||
1645 | * | ||
1646 | * Costs are factors >= 1.0 indicating the relative decoding costs of a | ||
1647 | * filter type. Higher costs indicate more decoding expense, and are | ||
1648 | * therefore less likely to be selected over a filter with lower computational | ||
1649 | * costs. There needs to be a value in "filter_costs" for each valid filter | ||
1650 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't | ||
1651 | * setting the costs. Costs try to improve the speed of decompression without | ||
1652 | * unduly increasing the compressed image size. | ||
1653 | * | ||
1654 | * A negative weight or cost indicates the default value is to be used, and | ||
1655 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. | ||
1656 | * The default values for both weights and costs are currently 1.0, but may | ||
1657 | * change if good general weighting/cost heuristics can be found. If both | ||
1658 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method | ||
1659 | * to the UNWEIGHTED method, but with added encoding time/computation. | ||
1660 | */ | ||
1661 | PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, | ||
1662 | int heuristic_method, int num_weights, png_const_doublep filter_weights, | ||
1663 | png_const_doublep filter_costs)); | ||
1664 | PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, | ||
1665 | (png_structp png_ptr, | ||
1666 | int heuristic_method, int num_weights, png_const_fixed_point_p | ||
1667 | filter_weights, png_const_fixed_point_p filter_costs)); | ||
1668 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ | ||
1669 | |||
1670 | /* Heuristic used for row filter selection. These defines should NOT be | ||
1671 | * changed. | ||
1672 | */ | ||
1673 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ | ||
1674 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ | ||
1675 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ | ||
1676 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ | ||
1677 | |||
1678 | #ifdef PNG_WRITE_SUPPORTED | ||
1679 | /* Set the library compression level. Currently, valid values range from | ||
1680 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 | ||
1681 | * (0 - no compression, 9 - "maximal" compression). Note that tests have | ||
1682 | * shown that zlib compression levels 3-6 usually perform as well as level 9 | ||
1683 | * for PNG images, and do considerably fewer caclulations. In the future, | ||
1684 | * these values may not correspond directly to the zlib compression levels. | ||
1685 | */ | ||
1686 | PNG_EXPORT(69, void, png_set_compression_level, | ||
1687 | (png_structp png_ptr, int level)); | ||
1688 | |||
1689 | PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, | ||
1690 | int mem_level)); | ||
1691 | |||
1692 | PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, | ||
1693 | int strategy)); | ||
1694 | |||
1695 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | ||
1696 | * smaller value of window_bits if it can do so safely. | ||
1697 | */ | ||
1698 | PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, | ||
1699 | int window_bits)); | ||
1700 | |||
1701 | PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, | ||
1702 | int method)); | ||
1703 | #endif | ||
1704 | |||
1705 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED | ||
1706 | /* Also set zlib parameters for compressing non-IDAT chunks */ | ||
1707 | PNG_EXPORT(222, void, png_set_text_compression_level, | ||
1708 | (png_structp png_ptr, int level)); | ||
1709 | |||
1710 | PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr, | ||
1711 | int mem_level)); | ||
1712 | |||
1713 | PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr, | ||
1714 | int strategy)); | ||
1715 | |||
1716 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | ||
1717 | * smaller value of window_bits if it can do so safely. | ||
1718 | */ | ||
1719 | PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp | ||
1720 | png_ptr, int window_bits)); | ||
1721 | |||
1722 | PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr, | ||
1723 | int method)); | ||
1724 | #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ | ||
1725 | |||
1726 | /* These next functions are called for input/output, memory, and error | ||
1727 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, | ||
1728 | * and call standard C I/O routines such as fread(), fwrite(), and | ||
1729 | * fprintf(). These functions can be made to use other I/O routines | ||
1730 | * at run time for those applications that need to handle I/O in a | ||
1731 | * different manner by calling png_set_???_fn(). See libpng-manual.txt for | ||
1732 | * more information. | ||
1733 | */ | ||
1734 | |||
1735 | #ifdef PNG_STDIO_SUPPORTED | ||
1736 | /* Initialize the input/output for the PNG file to the default functions. */ | ||
1737 | PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp)); | ||
1738 | #endif | ||
1739 | |||
1740 | /* Replace the (error and abort), and warning functions with user | ||
1741 | * supplied functions. If no messages are to be printed you must still | ||
1742 | * write and use replacement functions. The replacement error_fn should | ||
1743 | * still do a longjmp to the last setjmp location if you are using this | ||
1744 | * method of error handling. If error_fn or warning_fn is NULL, the | ||
1745 | * default function will be used. | ||
1746 | */ | ||
1747 | |||
1748 | PNG_EXPORT(75, void, png_set_error_fn, | ||
1749 | (png_structp png_ptr, png_voidp error_ptr, | ||
1750 | png_error_ptr error_fn, png_error_ptr warning_fn)); | ||
1751 | |||
1752 | /* Return the user pointer associated with the error functions */ | ||
1753 | PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr)); | ||
1754 | |||
1755 | /* Replace the default data output functions with a user supplied one(s). | ||
1756 | * If buffered output is not used, then output_flush_fn can be set to NULL. | ||
1757 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time | ||
1758 | * output_flush_fn will be ignored (and thus can be NULL). | ||
1759 | * It is probably a mistake to use NULL for output_flush_fn if | ||
1760 | * write_data_fn is not also NULL unless you have built libpng with | ||
1761 | * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's | ||
1762 | * default flush function, which uses the standard *FILE structure, will | ||
1763 | * be used. | ||
1764 | */ | ||
1765 | PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, | ||
1766 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); | ||
1767 | |||
1768 | /* Replace the default data input function with a user supplied one. */ | ||
1769 | PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, | ||
1770 | png_rw_ptr read_data_fn)); | ||
1771 | |||
1772 | /* Return the user pointer associated with the I/O functions */ | ||
1773 | PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr)); | ||
1774 | |||
1775 | PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, | ||
1776 | png_read_status_ptr read_row_fn)); | ||
1777 | |||
1778 | PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, | ||
1779 | png_write_status_ptr write_row_fn)); | ||
1780 | |||
1781 | #ifdef PNG_USER_MEM_SUPPORTED | ||
1782 | /* Replace the default memory allocation functions with user supplied one(s). */ | ||
1783 | PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, | ||
1784 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); | ||
1785 | /* Return the user pointer associated with the memory functions */ | ||
1786 | PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr)); | ||
1787 | #endif | ||
1788 | |||
1789 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED | ||
1790 | PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, | ||
1791 | png_user_transform_ptr read_user_transform_fn)); | ||
1792 | #endif | ||
1793 | |||
1794 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED | ||
1795 | PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, | ||
1796 | png_user_transform_ptr write_user_transform_fn)); | ||
1797 | #endif | ||
1798 | |||
1799 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED | ||
1800 | PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, | ||
1801 | png_voidp user_transform_ptr, int user_transform_depth, | ||
1802 | int user_transform_channels)); | ||
1803 | /* Return the user pointer associated with the user transform functions */ | ||
1804 | PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, | ||
1805 | (png_const_structp png_ptr)); | ||
1806 | #endif | ||
1807 | |||
1808 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED | ||
1809 | /* Return information about the row currently being processed. Note that these | ||
1810 | * APIs do not fail but will return unexpected results if called outside a user | ||
1811 | * transform callback. Also note that when transforming an interlaced image the | ||
1812 | * row number is the row number within the sub-image of the interlace pass, so | ||
1813 | * the value will increase to the height of the sub-image (not the full image) | ||
1814 | * then reset to 0 for the next pass. | ||
1815 | * | ||
1816 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to | ||
1817 | * find the output pixel (x,y) given an interlaced sub-image pixel | ||
1818 | * (row,col,pass). (See below for these macros.) | ||
1819 | */ | ||
1820 | PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp)); | ||
1821 | PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp)); | ||
1822 | #endif | ||
1823 | |||
1824 | #ifdef PNG_USER_CHUNKS_SUPPORTED | ||
1825 | PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, | ||
1826 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); | ||
1827 | PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); | ||
1828 | #endif | ||
1829 | |||
1830 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | ||
1831 | /* Sets the function callbacks for the push reader, and a pointer to a | ||
1832 | * user-defined structure available to the callback functions. | ||
1833 | */ | ||
1834 | PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, | ||
1835 | png_voidp progressive_ptr, png_progressive_info_ptr info_fn, | ||
1836 | png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); | ||
1837 | |||
1838 | /* Returns the user pointer associated with the push read functions */ | ||
1839 | PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr)); | ||
1840 | |||
1841 | /* Function to be called when data becomes available */ | ||
1842 | PNG_EXPORT(92, void, png_process_data, | ||
1843 | (png_structp png_ptr, png_infop info_ptr, | ||
1844 | png_bytep buffer, png_size_t buffer_size)); | ||
1845 | |||
1846 | /* A function which may be called *only* within png_process_data to stop the | ||
1847 | * processing of any more data. The function returns the number of bytes | ||
1848 | * remaining, excluding any that libpng has cached internally. A subsequent | ||
1849 | * call to png_process_data must supply these bytes again. If the argument | ||
1850 | * 'save' is set to true the routine will first save all the pending data and | ||
1851 | * will always return 0. | ||
1852 | */ | ||
1853 | PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save)); | ||
1854 | |||
1855 | /* A function which may be called *only* outside (after) a call to | ||
1856 | * png_process_data. It returns the number of bytes of data to skip in the | ||
1857 | * input. Normally it will return 0, but if it returns a non-zero value the | ||
1858 | * application must skip than number of bytes of input data and pass the | ||
1859 | * following data to the next call to png_process_data. | ||
1860 | */ | ||
1861 | PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp)); | ||
1862 | |||
1863 | #ifdef PNG_READ_INTERLACING_SUPPORTED | ||
1864 | /* Function that combines rows. 'new_row' is a flag that should come from | ||
1865 | * the callback and be non-NULL if anything needs to be done; the library | ||
1866 | * stores its own version of the new data internally and ignores the passed | ||
1867 | * in value. | ||
1868 | */ | ||
1869 | PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, | ||
1870 | png_bytep old_row, png_const_bytep new_row)); | ||
1871 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ | ||
1872 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ | ||
1873 | |||
1874 | PNG_EXPORTA(94, png_voidp, png_malloc, | ||
1875 | (png_structp png_ptr, png_alloc_size_t size), | ||
1876 | PNG_ALLOCATED); | ||
1877 | /* Added at libpng version 1.4.0 */ | ||
1878 | PNG_EXPORTA(95, png_voidp, png_calloc, | ||
1879 | (png_structp png_ptr, png_alloc_size_t size), | ||
1880 | PNG_ALLOCATED); | ||
1881 | |||
1882 | /* Added at libpng version 1.2.4 */ | ||
1883 | PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, | ||
1884 | png_alloc_size_t size), PNG_ALLOCATED); | ||
1885 | |||
1886 | /* Frees a pointer allocated by png_malloc() */ | ||
1887 | PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr)); | ||
1888 | |||
1889 | /* Free data that was allocated internally */ | ||
1890 | PNG_EXPORT(98, void, png_free_data, | ||
1891 | (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num)); | ||
1892 | |||
1893 | /* Reassign responsibility for freeing existing data, whether allocated | ||
1894 | * by libpng or by the application */ | ||
1895 | PNG_EXPORT(99, void, png_data_freer, | ||
1896 | (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask)); | ||
1897 | |||
1898 | /* Assignments for png_data_freer */ | ||
1899 | #define PNG_DESTROY_WILL_FREE_DATA 1 | ||
1900 | #define PNG_SET_WILL_FREE_DATA 1 | ||
1901 | #define PNG_USER_WILL_FREE_DATA 2 | ||
1902 | /* Flags for png_ptr->free_me and info_ptr->free_me */ | ||
1903 | #define PNG_FREE_HIST 0x0008 | ||
1904 | #define PNG_FREE_ICCP 0x0010 | ||
1905 | #define PNG_FREE_SPLT 0x0020 | ||
1906 | #define PNG_FREE_ROWS 0x0040 | ||
1907 | #define PNG_FREE_PCAL 0x0080 | ||
1908 | #define PNG_FREE_SCAL 0x0100 | ||
1909 | #define PNG_FREE_UNKN 0x0200 | ||
1910 | #define PNG_FREE_LIST 0x0400 | ||
1911 | #define PNG_FREE_PLTE 0x1000 | ||
1912 | #define PNG_FREE_TRNS 0x2000 | ||
1913 | #define PNG_FREE_TEXT 0x4000 | ||
1914 | #define PNG_FREE_ALL 0x7fff | ||
1915 | #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ | ||
1916 | |||
1917 | #ifdef PNG_USER_MEM_SUPPORTED | ||
1918 | PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, | ||
1919 | png_alloc_size_t size), PNG_ALLOCATED); | ||
1920 | PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); | ||
1921 | #endif | ||
1922 | |||
1923 | #ifdef PNG_ERROR_TEXT_SUPPORTED | ||
1924 | /* Fatal error in PNG image of libpng - can't continue */ | ||
1925 | PNG_EXPORTA(102, void, png_error, | ||
1926 | (png_structp png_ptr, png_const_charp error_message), | ||
1927 | PNG_NORETURN); | ||
1928 | |||
1929 | /* The same, but the chunk name is prepended to the error string. */ | ||
1930 | PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, | ||
1931 | png_const_charp error_message), PNG_NORETURN); | ||
1932 | |||
1933 | #else | ||
1934 | /* Fatal error in PNG image of libpng - can't continue */ | ||
1935 | PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); | ||
1936 | #endif | ||
1937 | |||
1938 | #ifdef PNG_WARNINGS_SUPPORTED | ||
1939 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ | ||
1940 | PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, | ||
1941 | png_const_charp warning_message)); | ||
1942 | |||
1943 | /* Non-fatal error in libpng, chunk name is prepended to message. */ | ||
1944 | PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, | ||
1945 | png_const_charp warning_message)); | ||
1946 | #endif | ||
1947 | |||
1948 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED | ||
1949 | /* Benign error in libpng. Can continue, but may have a problem. | ||
1950 | * User can choose whether to handle as a fatal error or as a warning. */ | ||
1951 | # undef png_benign_error | ||
1952 | PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, | ||
1953 | png_const_charp warning_message)); | ||
1954 | |||
1955 | /* Same, chunk name is prepended to message. */ | ||
1956 | # undef png_chunk_benign_error | ||
1957 | PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, | ||
1958 | png_const_charp warning_message)); | ||
1959 | |||
1960 | PNG_EXPORT(109, void, png_set_benign_errors, | ||
1961 | (png_structp png_ptr, int allowed)); | ||
1962 | #else | ||
1963 | # ifdef PNG_ALLOW_BENIGN_ERRORS | ||
1964 | # define png_benign_error png_warning | ||
1965 | # define png_chunk_benign_error png_chunk_warning | ||
1966 | # else | ||
1967 | # define png_benign_error png_error | ||
1968 | # define png_chunk_benign_error png_chunk_error | ||
1969 | # endif | ||
1970 | #endif | ||
1971 | |||
1972 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. | ||
1973 | * Similarly, the png_get_<chunk> calls are used to read values from the | ||
1974 | * png_info_struct, either storing the parameters in the passed variables, or | ||
1975 | * setting pointers into the png_info_struct where the data is stored. The | ||
1976 | * png_get_<chunk> functions return a non-zero value if the data was available | ||
1977 | * in info_ptr, or return zero and do not change any of the parameters if the | ||
1978 | * data was not available. | ||
1979 | * | ||
1980 | * These functions should be used instead of directly accessing png_info | ||
1981 | * to avoid problems with future changes in the size and internal layout of | ||
1982 | * png_info_struct. | ||
1983 | */ | ||
1984 | /* Returns "flag" if chunk data is valid in info_ptr. */ | ||
1985 | PNG_EXPORT(110, png_uint_32, png_get_valid, | ||
1986 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
1987 | png_uint_32 flag)); | ||
1988 | |||
1989 | /* Returns number of bytes needed to hold a transformed row. */ | ||
1990 | PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, | ||
1991 | png_const_infop info_ptr)); | ||
1992 | |||
1993 | #ifdef PNG_INFO_IMAGE_SUPPORTED | ||
1994 | /* Returns row_pointers, which is an array of pointers to scanlines that was | ||
1995 | * returned from png_read_png(). | ||
1996 | */ | ||
1997 | PNG_EXPORT(112, png_bytepp, png_get_rows, | ||
1998 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
1999 | /* Set row_pointers, which is an array of pointers to scanlines for use | ||
2000 | * by png_write_png(). | ||
2001 | */ | ||
2002 | PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr, | ||
2003 | png_infop info_ptr, png_bytepp row_pointers)); | ||
2004 | #endif | ||
2005 | |||
2006 | /* Returns number of color channels in image. */ | ||
2007 | PNG_EXPORT(114, png_byte, png_get_channels, | ||
2008 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2009 | |||
2010 | #ifdef PNG_EASY_ACCESS_SUPPORTED | ||
2011 | /* Returns image width in pixels. */ | ||
2012 | PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, | ||
2013 | png_const_infop info_ptr)); | ||
2014 | |||
2015 | /* Returns image height in pixels. */ | ||
2016 | PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, | ||
2017 | png_const_infop info_ptr)); | ||
2018 | |||
2019 | /* Returns image bit_depth. */ | ||
2020 | PNG_EXPORT(117, png_byte, png_get_bit_depth, | ||
2021 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2022 | |||
2023 | /* Returns image color_type. */ | ||
2024 | PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, | ||
2025 | png_const_infop info_ptr)); | ||
2026 | |||
2027 | /* Returns image filter_type. */ | ||
2028 | PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, | ||
2029 | png_const_infop info_ptr)); | ||
2030 | |||
2031 | /* Returns image interlace_type. */ | ||
2032 | PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, | ||
2033 | png_const_infop info_ptr)); | ||
2034 | |||
2035 | /* Returns image compression_type. */ | ||
2036 | PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, | ||
2037 | png_const_infop info_ptr)); | ||
2038 | |||
2039 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ | ||
2040 | PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, | ||
2041 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2042 | PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, | ||
2043 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2044 | PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, | ||
2045 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2046 | |||
2047 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ | ||
2048 | PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, | ||
2049 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2050 | PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, | ||
2051 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2052 | |||
2053 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ | ||
2054 | PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, | ||
2055 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2056 | PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, | ||
2057 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2058 | PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, | ||
2059 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2060 | PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, | ||
2061 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2062 | |||
2063 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ | ||
2064 | |||
2065 | /* Returns pointer to signature string read from PNG header */ | ||
2066 | PNG_EXPORT(130, png_const_bytep, png_get_signature, | ||
2067 | (png_const_structp png_ptr, png_infop info_ptr)); | ||
2068 | |||
2069 | #ifdef PNG_bKGD_SUPPORTED | ||
2070 | PNG_EXPORT(131, png_uint_32, png_get_bKGD, | ||
2071 | (png_const_structp png_ptr, png_infop info_ptr, | ||
2072 | png_color_16p *background)); | ||
2073 | #endif | ||
2074 | |||
2075 | #ifdef PNG_bKGD_SUPPORTED | ||
2076 | PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, | ||
2077 | png_const_color_16p background)); | ||
2078 | #endif | ||
2079 | |||
2080 | #ifdef PNG_cHRM_SUPPORTED | ||
2081 | PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, | ||
2082 | png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, | ||
2083 | double *red_y, double *green_x, double *green_y, double *blue_x, | ||
2084 | double *blue_y)); | ||
2085 | PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr, | ||
2086 | png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z, | ||
2087 | double *green_X, double *green_Y, double *green_Z, double *blue_X, | ||
2088 | double *blue_Y, double *blue_Z)); | ||
2089 | #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ | ||
2090 | PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, | ||
2091 | (png_const_structp png_ptr, | ||
2092 | png_const_infop info_ptr, png_fixed_point *int_white_x, | ||
2093 | png_fixed_point *int_white_y, png_fixed_point *int_red_x, | ||
2094 | png_fixed_point *int_red_y, png_fixed_point *int_green_x, | ||
2095 | png_fixed_point *int_green_y, png_fixed_point *int_blue_x, | ||
2096 | png_fixed_point *int_blue_y)); | ||
2097 | #endif | ||
2098 | PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, | ||
2099 | (png_structp png_ptr, png_const_infop info_ptr, | ||
2100 | png_fixed_point *int_red_X, png_fixed_point *int_red_Y, | ||
2101 | png_fixed_point *int_red_Z, png_fixed_point *int_green_X, | ||
2102 | png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, | ||
2103 | png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, | ||
2104 | png_fixed_point *int_blue_Z)); | ||
2105 | #endif | ||
2106 | |||
2107 | #ifdef PNG_cHRM_SUPPORTED | ||
2108 | PNG_FP_EXPORT(135, void, png_set_cHRM, | ||
2109 | (png_structp png_ptr, png_infop info_ptr, | ||
2110 | double white_x, double white_y, double red_x, double red_y, double green_x, | ||
2111 | double green_y, double blue_x, double blue_y)); | ||
2112 | PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr, | ||
2113 | png_infop info_ptr, double red_X, double red_Y, double red_Z, | ||
2114 | double green_X, double green_Y, double green_Z, double blue_X, | ||
2115 | double blue_Y, double blue_Z)); | ||
2116 | PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, | ||
2117 | png_infop info_ptr, png_fixed_point int_white_x, | ||
2118 | png_fixed_point int_white_y, png_fixed_point int_red_x, | ||
2119 | png_fixed_point int_red_y, png_fixed_point int_green_x, | ||
2120 | png_fixed_point int_green_y, png_fixed_point int_blue_x, | ||
2121 | png_fixed_point int_blue_y)); | ||
2122 | PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr, | ||
2123 | png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, | ||
2124 | png_fixed_point int_red_Z, png_fixed_point int_green_X, | ||
2125 | png_fixed_point int_green_Y, png_fixed_point int_green_Z, | ||
2126 | png_fixed_point int_blue_X, png_fixed_point int_blue_Y, | ||
2127 | png_fixed_point int_blue_Z)); | ||
2128 | #endif | ||
2129 | |||
2130 | #ifdef PNG_gAMA_SUPPORTED | ||
2131 | PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, | ||
2132 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2133 | double *file_gamma)); | ||
2134 | PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, | ||
2135 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2136 | png_fixed_point *int_file_gamma)); | ||
2137 | #endif | ||
2138 | |||
2139 | #ifdef PNG_gAMA_SUPPORTED | ||
2140 | PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, | ||
2141 | png_infop info_ptr, double file_gamma)); | ||
2142 | PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, | ||
2143 | png_infop info_ptr, png_fixed_point int_file_gamma)); | ||
2144 | #endif | ||
2145 | |||
2146 | #ifdef PNG_hIST_SUPPORTED | ||
2147 | PNG_EXPORT(141, png_uint_32, png_get_hIST, | ||
2148 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2149 | png_uint_16p *hist)); | ||
2150 | #endif | ||
2151 | |||
2152 | #ifdef PNG_hIST_SUPPORTED | ||
2153 | PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, | ||
2154 | png_infop info_ptr, png_const_uint_16p hist)); | ||
2155 | #endif | ||
2156 | |||
2157 | PNG_EXPORT(143, png_uint_32, png_get_IHDR, | ||
2158 | (png_structp png_ptr, png_infop info_ptr, | ||
2159 | png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, | ||
2160 | int *interlace_method, int *compression_method, int *filter_method)); | ||
2161 | |||
2162 | PNG_EXPORT(144, void, png_set_IHDR, | ||
2163 | (png_structp png_ptr, png_infop info_ptr, | ||
2164 | png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, | ||
2165 | int interlace_method, int compression_method, int filter_method)); | ||
2166 | |||
2167 | #ifdef PNG_oFFs_SUPPORTED | ||
2168 | PNG_EXPORT(145, png_uint_32, png_get_oFFs, | ||
2169 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2170 | png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); | ||
2171 | #endif | ||
2172 | |||
2173 | #ifdef PNG_oFFs_SUPPORTED | ||
2174 | PNG_EXPORT(146, void, png_set_oFFs, | ||
2175 | (png_structp png_ptr, png_infop info_ptr, | ||
2176 | png_int_32 offset_x, png_int_32 offset_y, int unit_type)); | ||
2177 | #endif | ||
2178 | |||
2179 | #ifdef PNG_pCAL_SUPPORTED | ||
2180 | PNG_EXPORT(147, png_uint_32, png_get_pCAL, | ||
2181 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2182 | png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, | ||
2183 | int *nparams, | ||
2184 | png_charp *units, png_charpp *params)); | ||
2185 | #endif | ||
2186 | |||
2187 | #ifdef PNG_pCAL_SUPPORTED | ||
2188 | PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, | ||
2189 | png_infop info_ptr, | ||
2190 | png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, | ||
2191 | int nparams, png_const_charp units, png_charpp params)); | ||
2192 | #endif | ||
2193 | |||
2194 | #ifdef PNG_pHYs_SUPPORTED | ||
2195 | PNG_EXPORT(149, png_uint_32, png_get_pHYs, | ||
2196 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2197 | png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); | ||
2198 | #endif | ||
2199 | |||
2200 | #ifdef PNG_pHYs_SUPPORTED | ||
2201 | PNG_EXPORT(150, void, png_set_pHYs, | ||
2202 | (png_structp png_ptr, png_infop info_ptr, | ||
2203 | png_uint_32 res_x, png_uint_32 res_y, int unit_type)); | ||
2204 | #endif | ||
2205 | |||
2206 | PNG_EXPORT(151, png_uint_32, png_get_PLTE, | ||
2207 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2208 | png_colorp *palette, int *num_palette)); | ||
2209 | |||
2210 | PNG_EXPORT(152, void, png_set_PLTE, | ||
2211 | (png_structp png_ptr, png_infop info_ptr, | ||
2212 | png_const_colorp palette, int num_palette)); | ||
2213 | |||
2214 | #ifdef PNG_sBIT_SUPPORTED | ||
2215 | PNG_EXPORT(153, png_uint_32, png_get_sBIT, | ||
2216 | (png_const_structp png_ptr, png_infop info_ptr, | ||
2217 | png_color_8p *sig_bit)); | ||
2218 | #endif | ||
2219 | |||
2220 | #ifdef PNG_sBIT_SUPPORTED | ||
2221 | PNG_EXPORT(154, void, png_set_sBIT, | ||
2222 | (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit)); | ||
2223 | #endif | ||
2224 | |||
2225 | #ifdef PNG_sRGB_SUPPORTED | ||
2226 | PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr, | ||
2227 | png_const_infop info_ptr, int *file_srgb_intent)); | ||
2228 | #endif | ||
2229 | |||
2230 | #ifdef PNG_sRGB_SUPPORTED | ||
2231 | PNG_EXPORT(156, void, png_set_sRGB, | ||
2232 | (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); | ||
2233 | PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, | ||
2234 | png_infop info_ptr, int srgb_intent)); | ||
2235 | #endif | ||
2236 | |||
2237 | #ifdef PNG_iCCP_SUPPORTED | ||
2238 | PNG_EXPORT(158, png_uint_32, png_get_iCCP, | ||
2239 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2240 | png_charpp name, int *compression_type, png_bytepp profile, | ||
2241 | png_uint_32 *proflen)); | ||
2242 | #endif | ||
2243 | |||
2244 | #ifdef PNG_iCCP_SUPPORTED | ||
2245 | PNG_EXPORT(159, void, png_set_iCCP, | ||
2246 | (png_structp png_ptr, png_infop info_ptr, | ||
2247 | png_const_charp name, int compression_type, png_const_bytep profile, | ||
2248 | png_uint_32 proflen)); | ||
2249 | #endif | ||
2250 | |||
2251 | #ifdef PNG_sPLT_SUPPORTED | ||
2252 | PNG_EXPORT(160, png_uint_32, png_get_sPLT, | ||
2253 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2254 | png_sPLT_tpp entries)); | ||
2255 | #endif | ||
2256 | |||
2257 | #ifdef PNG_sPLT_SUPPORTED | ||
2258 | PNG_EXPORT(161, void, png_set_sPLT, | ||
2259 | (png_structp png_ptr, png_infop info_ptr, | ||
2260 | png_const_sPLT_tp entries, int nentries)); | ||
2261 | #endif | ||
2262 | |||
2263 | #ifdef PNG_TEXT_SUPPORTED | ||
2264 | /* png_get_text also returns the number of text chunks in *num_text */ | ||
2265 | PNG_EXPORT(162, png_uint_32, png_get_text, | ||
2266 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2267 | png_textp *text_ptr, int *num_text)); | ||
2268 | #endif | ||
2269 | |||
2270 | /* Note while png_set_text() will accept a structure whose text, | ||
2271 | * language, and translated keywords are NULL pointers, the structure | ||
2272 | * returned by png_get_text will always contain regular | ||
2273 | * zero-terminated C strings. They might be empty strings but | ||
2274 | * they will never be NULL pointers. | ||
2275 | */ | ||
2276 | |||
2277 | #ifdef PNG_TEXT_SUPPORTED | ||
2278 | PNG_EXPORT(163, void, png_set_text, | ||
2279 | (png_structp png_ptr, png_infop info_ptr, | ||
2280 | png_const_textp text_ptr, int num_text)); | ||
2281 | #endif | ||
2282 | |||
2283 | #ifdef PNG_tIME_SUPPORTED | ||
2284 | PNG_EXPORT(164, png_uint_32, png_get_tIME, | ||
2285 | (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)); | ||
2286 | #endif | ||
2287 | |||
2288 | #ifdef PNG_tIME_SUPPORTED | ||
2289 | PNG_EXPORT(165, void, png_set_tIME, | ||
2290 | (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)); | ||
2291 | #endif | ||
2292 | |||
2293 | #ifdef PNG_tRNS_SUPPORTED | ||
2294 | PNG_EXPORT(166, png_uint_32, png_get_tRNS, | ||
2295 | (png_const_structp png_ptr, png_infop info_ptr, | ||
2296 | png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)); | ||
2297 | #endif | ||
2298 | |||
2299 | #ifdef PNG_tRNS_SUPPORTED | ||
2300 | PNG_EXPORT(167, void, png_set_tRNS, | ||
2301 | (png_structp png_ptr, png_infop info_ptr, | ||
2302 | png_const_bytep trans_alpha, int num_trans, | ||
2303 | png_const_color_16p trans_color)); | ||
2304 | #endif | ||
2305 | |||
2306 | #ifdef PNG_sCAL_SUPPORTED | ||
2307 | PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, | ||
2308 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2309 | int *unit, double *width, double *height)); | ||
2310 | #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED | ||
2311 | /* NOTE: this API is currently implemented using floating point arithmetic, | ||
2312 | * consequently it can only be used on systems with floating point support. | ||
2313 | * In any case the range of values supported by png_fixed_point is small and it | ||
2314 | * is highly recommended that png_get_sCAL_s be used instead. | ||
2315 | */ | ||
2316 | PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, | ||
2317 | (png_structp png_ptr, png_const_infop info_ptr, int *unit, | ||
2318 | png_fixed_point *width, | ||
2319 | png_fixed_point *height)); | ||
2320 | #endif | ||
2321 | PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, | ||
2322 | (png_const_structp png_ptr, png_const_infop info_ptr, | ||
2323 | int *unit, png_charpp swidth, png_charpp sheight)); | ||
2324 | |||
2325 | PNG_FP_EXPORT(170, void, png_set_sCAL, | ||
2326 | (png_structp png_ptr, png_infop info_ptr, | ||
2327 | int unit, double width, double height)); | ||
2328 | PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, | ||
2329 | png_infop info_ptr, int unit, png_fixed_point width, | ||
2330 | png_fixed_point height)); | ||
2331 | PNG_EXPORT(171, void, png_set_sCAL_s, | ||
2332 | (png_structp png_ptr, png_infop info_ptr, | ||
2333 | int unit, png_const_charp swidth, png_const_charp sheight)); | ||
2334 | #endif /* PNG_sCAL_SUPPORTED */ | ||
2335 | |||
2336 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED | ||
2337 | /* Provide a list of chunks and how they are to be handled, if the built-in | ||
2338 | handling or default unknown chunk handling is not desired. Any chunks not | ||
2339 | listed will be handled in the default manner. The IHDR and IEND chunks | ||
2340 | must not be listed. Because this turns off the default handling for chunks | ||
2341 | that would otherwise be recognized the behavior of libpng transformations may | ||
2342 | well become incorrect! | ||
2343 | keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior | ||
2344 | = 1: PNG_HANDLE_CHUNK_NEVER: do not keep | ||
2345 | = 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy | ||
2346 | = 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy | ||
2347 | */ | ||
2348 | PNG_EXPORT(172, void, png_set_keep_unknown_chunks, | ||
2349 | (png_structp png_ptr, int keep, | ||
2350 | png_const_bytep chunk_list, int num_chunks)); | ||
2351 | |||
2352 | /* The handling code is returned; the result is therefore true (non-zero) if | ||
2353 | * special handling is required, false for the default handling. | ||
2354 | */ | ||
2355 | PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, | ||
2356 | png_const_bytep chunk_name)); | ||
2357 | #endif | ||
2358 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED | ||
2359 | PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, | ||
2360 | png_infop info_ptr, png_const_unknown_chunkp unknowns, | ||
2361 | int num_unknowns)); | ||
2362 | PNG_EXPORT(175, void, png_set_unknown_chunk_location, | ||
2363 | (png_structp png_ptr, png_infop info_ptr, int chunk, int location)); | ||
2364 | PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, | ||
2365 | png_const_infop info_ptr, png_unknown_chunkpp entries)); | ||
2366 | #endif | ||
2367 | |||
2368 | /* Png_free_data() will turn off the "valid" flag for anything it frees. | ||
2369 | * If you need to turn it off for a chunk that your application has freed, | ||
2370 | * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); | ||
2371 | */ | ||
2372 | PNG_EXPORT(177, void, png_set_invalid, | ||
2373 | (png_structp png_ptr, png_infop info_ptr, int mask)); | ||
2374 | |||
2375 | #ifdef PNG_INFO_IMAGE_SUPPORTED | ||
2376 | /* The "params" pointer is currently not used and is for future expansion. */ | ||
2377 | PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, | ||
2378 | int transforms, png_voidp params)); | ||
2379 | PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, | ||
2380 | int transforms, png_voidp params)); | ||
2381 | #endif | ||
2382 | |||
2383 | PNG_EXPORT(180, png_const_charp, png_get_copyright, | ||
2384 | (png_const_structp png_ptr)); | ||
2385 | PNG_EXPORT(181, png_const_charp, png_get_header_ver, | ||
2386 | (png_const_structp png_ptr)); | ||
2387 | PNG_EXPORT(182, png_const_charp, png_get_header_version, | ||
2388 | (png_const_structp png_ptr)); | ||
2389 | PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, | ||
2390 | (png_const_structp png_ptr)); | ||
2391 | |||
2392 | #ifdef PNG_MNG_FEATURES_SUPPORTED | ||
2393 | PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, | ||
2394 | png_uint_32 mng_features_permitted)); | ||
2395 | #endif | ||
2396 | |||
2397 | /* For use in png_set_keep_unknown, added to version 1.2.6 */ | ||
2398 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 | ||
2399 | #define PNG_HANDLE_CHUNK_NEVER 1 | ||
2400 | #define PNG_HANDLE_CHUNK_IF_SAFE 2 | ||
2401 | #define PNG_HANDLE_CHUNK_ALWAYS 3 | ||
2402 | |||
2403 | /* Strip the prepended error numbers ("#nnn ") from error and warning | ||
2404 | * messages before passing them to the error or warning handler. | ||
2405 | */ | ||
2406 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED | ||
2407 | PNG_EXPORT(185, void, png_set_strip_error_numbers, | ||
2408 | (png_structp png_ptr, | ||
2409 | png_uint_32 strip_mode)); | ||
2410 | #endif | ||
2411 | |||
2412 | /* Added in libpng-1.2.6 */ | ||
2413 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED | ||
2414 | PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, | ||
2415 | png_uint_32 user_width_max, png_uint_32 user_height_max)); | ||
2416 | PNG_EXPORT(187, png_uint_32, png_get_user_width_max, | ||
2417 | (png_const_structp png_ptr)); | ||
2418 | PNG_EXPORT(188, png_uint_32, png_get_user_height_max, | ||
2419 | (png_const_structp png_ptr)); | ||
2420 | /* Added in libpng-1.4.0 */ | ||
2421 | PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, | ||
2422 | png_uint_32 user_chunk_cache_max)); | ||
2423 | PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, | ||
2424 | (png_const_structp png_ptr)); | ||
2425 | /* Added in libpng-1.4.1 */ | ||
2426 | PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, | ||
2427 | png_alloc_size_t user_chunk_cache_max)); | ||
2428 | PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, | ||
2429 | (png_const_structp png_ptr)); | ||
2430 | #endif | ||
2431 | |||
2432 | #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) | ||
2433 | PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, | ||
2434 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2435 | |||
2436 | PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, | ||
2437 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2438 | |||
2439 | PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, | ||
2440 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2441 | |||
2442 | PNG_FP_EXPORT(196, float, png_get_x_offset_inches, | ||
2443 | (png_const_structp png_ptr, png_const_infop info_ptr)); | ||
2444 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ | ||
2445 | PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, | ||
2446 | (png_structp png_ptr, png_const_infop info_ptr)); | ||
2447 | #endif | ||
2448 | |||
2449 | PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, | ||
2450 | png_const_infop info_ptr)); | ||
2451 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ | ||
2452 | PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, | ||
2453 | (png_structp png_ptr, png_const_infop info_ptr)); | ||
2454 | #endif | ||
2455 | |||
2456 | # ifdef PNG_pHYs_SUPPORTED | ||
2457 | PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, | ||
2458 | png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, | ||
2459 | int *unit_type)); | ||
2460 | # endif /* PNG_pHYs_SUPPORTED */ | ||
2461 | #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ | ||
2462 | |||
2463 | /* Added in libpng-1.4.0 */ | ||
2464 | #ifdef PNG_IO_STATE_SUPPORTED | ||
2465 | PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr)); | ||
2466 | |||
2467 | PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name, | ||
2468 | (png_structp png_ptr), PNG_DEPRECATED); | ||
2469 | PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, | ||
2470 | (png_const_structp png_ptr)); | ||
2471 | |||
2472 | /* The flags returned by png_get_io_state() are the following: */ | ||
2473 | # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ | ||
2474 | # define PNG_IO_READING 0x0001 /* currently reading */ | ||
2475 | # define PNG_IO_WRITING 0x0002 /* currently writing */ | ||
2476 | # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ | ||
2477 | # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ | ||
2478 | # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ | ||
2479 | # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ | ||
2480 | # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ | ||
2481 | # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ | ||
2482 | #endif /* ?PNG_IO_STATE_SUPPORTED */ | ||
2483 | |||
2484 | /* Interlace support. The following macros are always defined so that if | ||
2485 | * libpng interlace handling is turned off the macros may be used to handle | ||
2486 | * interlaced images within the application. | ||
2487 | */ | ||
2488 | #define PNG_INTERLACE_ADAM7_PASSES 7 | ||
2489 | |||
2490 | /* Two macros to return the first row and first column of the original, | ||
2491 | * full, image which appears in a given pass. 'pass' is in the range 0 | ||
2492 | * to 6 and the result is in the range 0 to 7. | ||
2493 | */ | ||
2494 | #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) | ||
2495 | #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) | ||
2496 | |||
2497 | /* A macro to return the offset between pixels in the output row for a pair of | ||
2498 | * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that | ||
2499 | * follows. Note that ROW_OFFSET is the offset from one row to the next whereas | ||
2500 | * COL_OFFSET is from one column to the next, within a row. | ||
2501 | */ | ||
2502 | #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) | ||
2503 | #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) | ||
2504 | |||
2505 | /* Two macros to help evaluate the number of rows or columns in each | ||
2506 | * pass. This is expressed as a shift - effectively log2 of the number or | ||
2507 | * rows or columns in each 8x8 tile of the original image. | ||
2508 | */ | ||
2509 | #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) | ||
2510 | #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) | ||
2511 | |||
2512 | /* Hence two macros to determine the number of rows or columns in a given | ||
2513 | * pass of an image given its height or width. In fact these macros may | ||
2514 | * return non-zero even though the sub-image is empty, because the other | ||
2515 | * dimension may be empty for a small image. | ||
2516 | */ | ||
2517 | #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ | ||
2518 | -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) | ||
2519 | #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ | ||
2520 | -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) | ||
2521 | |||
2522 | /* For the reader row callbacks (both progressive and sequential) it is | ||
2523 | * necessary to find the row in the output image given a row in an interlaced | ||
2524 | * image, so two more macros: | ||
2525 | */ | ||
2526 | #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ | ||
2527 | (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) | ||
2528 | #define PNG_COL_FROM_PASS_COL(xIn, pass) \ | ||
2529 | (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) | ||
2530 | |||
2531 | /* Two macros which return a boolean (0 or 1) saying whether the given row | ||
2532 | * or column is in a particular pass. These use a common utility macro that | ||
2533 | * returns a mask for a given pass - the offset 'off' selects the row or | ||
2534 | * column version. The mask has the appropriate bit set for each column in | ||
2535 | * the tile. | ||
2536 | */ | ||
2537 | #define PNG_PASS_MASK(pass,off) ( \ | ||
2538 | ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ | ||
2539 | ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) | ||
2540 | |||
2541 | #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ | ||
2542 | ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) | ||
2543 | #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ | ||
2544 | ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) | ||
2545 | |||
2546 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED | ||
2547 | /* With these routines we avoid an integer divide, which will be slower on | ||
2548 | * most machines. However, it does take more operations than the corresponding | ||
2549 | * divide method, so it may be slower on a few RISC systems. There are two | ||
2550 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. | ||
2551 | * | ||
2552 | * Note that the rounding factors are NOT supposed to be the same! 128 and | ||
2553 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the | ||
2554 | * standard method. | ||
2555 | * | ||
2556 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] | ||
2557 | */ | ||
2558 | |||
2559 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ | ||
2560 | |||
2561 | # define png_composite(composite, fg, alpha, bg) \ | ||
2562 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ | ||
2563 | * (png_uint_16)(alpha) \ | ||
2564 | + (png_uint_16)(bg)*(png_uint_16)(255 \ | ||
2565 | - (png_uint_16)(alpha)) + 128); \ | ||
2566 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } | ||
2567 | |||
2568 | # define png_composite_16(composite, fg, alpha, bg) \ | ||
2569 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ | ||
2570 | * (png_uint_32)(alpha) \ | ||
2571 | + (png_uint_32)(bg)*(65535 \ | ||
2572 | - (png_uint_32)(alpha)) + 32768); \ | ||
2573 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } | ||
2574 | |||
2575 | #else /* Standard method using integer division */ | ||
2576 | |||
2577 | # define png_composite(composite, fg, alpha, bg) \ | ||
2578 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ | ||
2579 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ | ||
2580 | 127) / 255) | ||
2581 | |||
2582 | # define png_composite_16(composite, fg, alpha, bg) \ | ||
2583 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ | ||
2584 | (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ | ||
2585 | 32767) / 65535) | ||
2586 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ | ||
2587 | |||
2588 | #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED | ||
2589 | PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); | ||
2590 | PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); | ||
2591 | PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); | ||
2592 | #endif | ||
2593 | |||
2594 | PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr, | ||
2595 | png_const_bytep buf)); | ||
2596 | /* No png_get_int_16 -- may be added if there's a real need for it. */ | ||
2597 | |||
2598 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ | ||
2599 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED | ||
2600 | PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); | ||
2601 | #endif | ||
2602 | #ifdef PNG_SAVE_INT_32_SUPPORTED | ||
2603 | PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); | ||
2604 | #endif | ||
2605 | |||
2606 | /* Place a 16-bit number into a buffer in PNG byte order. | ||
2607 | * The parameter is declared unsigned int, not png_uint_16, | ||
2608 | * just to avoid potential problems on pre-ANSI C compilers. | ||
2609 | */ | ||
2610 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED | ||
2611 | PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); | ||
2612 | /* No png_save_int_16 -- may be added if there's a real need for it. */ | ||
2613 | #endif | ||
2614 | |||
2615 | #ifdef PNG_USE_READ_MACROS | ||
2616 | /* Inline macros to do direct reads of bytes from the input buffer. | ||
2617 | * The png_get_int_32() routine assumes we are using two's complement | ||
2618 | * format for negative values, which is almost certainly true. | ||
2619 | */ | ||
2620 | # define png_get_uint_32(buf) \ | ||
2621 | (((png_uint_32)(*(buf)) << 24) + \ | ||
2622 | ((png_uint_32)(*((buf) + 1)) << 16) + \ | ||
2623 | ((png_uint_32)(*((buf) + 2)) << 8) + \ | ||
2624 | ((png_uint_32)(*((buf) + 3)))) | ||
2625 | |||
2626 | /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the | ||
2627 | * function) incorrectly returned a value of type png_uint_32. | ||
2628 | */ | ||
2629 | # define png_get_uint_16(buf) \ | ||
2630 | ((png_uint_16) \ | ||
2631 | (((unsigned int)(*(buf)) << 8) + \ | ||
2632 | ((unsigned int)(*((buf) + 1))))) | ||
2633 | |||
2634 | # define png_get_int_32(buf) \ | ||
2635 | ((png_int_32)((*(buf) & 0x80) \ | ||
2636 | ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ | ||
2637 | : (png_int_32)png_get_uint_32(buf))) | ||
2638 | #endif | ||
2639 | |||
2640 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project | ||
2641 | * defs | ||
2642 | */ | ||
2643 | |||
2644 | /* The last ordinal number (this is the *last* one already used; the next | ||
2645 | * one to use is one more than this.) Maintainer, remember to add an entry to | ||
2646 | * scripts/symbols.def as well. | ||
2647 | */ | ||
2648 | #ifdef PNG_EXPORT_LAST_ORDINAL | ||
2649 | PNG_EXPORT_LAST_ORDINAL(233); | ||
2650 | #endif | ||
2651 | |||
2652 | #ifdef __cplusplus | ||
2653 | } | ||
2654 | #endif | ||
2655 | |||
2656 | #endif /* PNG_VERSION_INFO_ONLY */ | ||
2657 | /* Do not put anything past this line */ | ||
2658 | #endif /* PNG_H */ | ||