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view libs/libpng/png.h @ 40:9e8fb79fd959
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| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Sun, 19 Feb 2012 17:25:41 +0200 |
| parents | |
| children |
line source
1 /* png.h - header file for PNG reference library
2 *
3 * libpng version 1.2.33 - October 31, 2008
4 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
7 *
8 * Authors and maintainers:
9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
11 * libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn
12 * See also "Contributing Authors", below.
13 *
14 * Note about libpng version numbers:
15 *
16 * Due to various miscommunications, unforeseen code incompatibilities
17 * and occasional factors outside the authors' control, version numbering
18 * on the library has not always been consistent and straightforward.
19 * The following table summarizes matters since version 0.89c, which was
20 * the first widely used release:
21 *
22 * source png.h png.h shared-lib
23 * version string int version
24 * ------- ------ ----- ----------
25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
30 * 0.97c 0.97 97 2.0.97
31 * 0.98 0.98 98 2.0.98
32 * 0.99 0.99 98 2.0.99
33 * 0.99a-m 0.99 99 2.0.99
34 * 1.00 1.00 100 2.1.0 [100 should be 10000]
35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
36 * 1.0.1 png.h string is 10001 2.1.0
37 * 1.0.1a-e identical to the 10002 from here on, the shared library
38 * 1.0.2 source version) 10002 is 2.V where V is the source code
39 * 1.0.2a-b 10003 version, except as noted.
40 * 1.0.3 10003
41 * 1.0.3a-d 10004
42 * 1.0.4 10004
43 * 1.0.4a-f 10005
44 * 1.0.5 (+ 2 patches) 10005
45 * 1.0.5a-d 10006
46 * 1.0.5e-r 10100 (not source compatible)
47 * 1.0.5s-v 10006 (not binary compatible)
48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
49 * 1.0.6d-f 10007 (still binary incompatible)
50 * 1.0.6g 10007
51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
52 * 1.0.6i 10007 10.6i
53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
57 * 1.0.7 1 10007 (still compatible)
58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
59 * 1.0.8rc1 1 10008 2.1.0.8rc1
60 * 1.0.8 1 10008 2.1.0.8
61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
62 * 1.0.9rc1 1 10009 2.1.0.9rc1
63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
64 * 1.0.9rc2 1 10009 2.1.0.9rc2
65 * 1.0.9 1 10009 2.1.0.9
66 * 1.0.10beta1 1 10010 2.1.0.10beta1
67 * 1.0.10rc1 1 10010 2.1.0.10rc1
68 * 1.0.10 1 10010 2.1.0.10
69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
70 * 1.0.11rc1 1 10011 2.1.0.11rc1
71 * 1.0.11 1 10011 2.1.0.11
72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
73 * 1.0.12rc1 2 10012 2.1.0.12rc1
74 * 1.0.12 2 10012 2.1.0.12
75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
78 * 1.2.0rc1 3 10200 3.1.2.0rc1
79 * 1.2.0 3 10200 3.1.2.0
80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
82 * 1.2.1 3 10201 3.1.2.1
83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
87 * 1.0.13 10 10013 10.so.0.1.0.13
88 * 1.2.2 12 10202 12.so.0.1.2.2
89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
90 * 1.2.3 12 10203 12.so.0.1.2.3
91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
94 * 1.0.14 10 10014 10.so.0.1.0.14
95 * 1.2.4 13 10204 12.so.0.1.2.4
96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
99 * 1.0.15 10 10015 10.so.0.1.0.15
100 * 1.2.5 13 10205 12.so.0.1.2.5
101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
102 * 1.0.16 10 10016 10.so.0.1.0.16
103 * 1.2.6 13 10206 12.so.0.1.2.6
104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
105 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
107 * 1.0.17 10 10017 10.so.0.1.0.17
108 * 1.2.7 13 10207 12.so.0.1.2.7
109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
110 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
112 * 1.0.18 10 10018 10.so.0.1.0.18
113 * 1.2.8 13 10208 12.so.0.1.2.8
114 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
115 * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
116 * 1.2.9rc1 13 10209 12.so.0.9[.0]
117 * 1.2.9 13 10209 12.so.0.9[.0]
118 * 1.2.10beta1-8 13 10210 12.so.0.10[.0]
119 * 1.2.10rc1-3 13 10210 12.so.0.10[.0]
120 * 1.2.10 13 10210 12.so.0.10[.0]
121 * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
122 * 1.0.19rc1-5 10 10019 10.so.0.19[.0]
123 * 1.2.11rc1-5 13 10211 12.so.0.11[.0]
124 * 1.0.19 10 10019 10.so.0.19[.0]
125 * 1.2.11 13 10211 12.so.0.11[.0]
126 * 1.0.20 10 10020 10.so.0.20[.0]
127 * 1.2.12 13 10212 12.so.0.12[.0]
128 * 1.2.13beta1 13 10213 12.so.0.13[.0]
129 * 1.0.21 10 10021 10.so.0.21[.0]
130 * 1.2.13 13 10213 12.so.0.13[.0]
131 * 1.2.14beta1-2 13 10214 12.so.0.14[.0]
132 * 1.0.22rc1 10 10022 10.so.0.22[.0]
133 * 1.2.14rc1 13 10214 12.so.0.14[.0]
134 * 1.0.22 10 10022 10.so.0.22[.0]
135 * 1.2.14 13 10214 12.so.0.14[.0]
136 * 1.2.15beta1-6 13 10215 12.so.0.15[.0]
137 * 1.0.23rc1-5 10 10023 10.so.0.23[.0]
138 * 1.2.15rc1-5 13 10215 12.so.0.15[.0]
139 * 1.0.23 10 10023 10.so.0.23[.0]
140 * 1.2.15 13 10215 12.so.0.15[.0]
141 * 1.2.16beta1-2 13 10216 12.so.0.16[.0]
142 * 1.2.16rc1 13 10216 12.so.0.16[.0]
143 * 1.0.24 10 10024 10.so.0.24[.0]
144 * 1.2.16 13 10216 12.so.0.16[.0]
145 * 1.2.17beta1-2 13 10217 12.so.0.17[.0]
146 * 1.0.25rc1 10 10025 10.so.0.25[.0]
147 * 1.2.17rc1-3 13 10217 12.so.0.17[.0]
148 * 1.0.25 10 10025 10.so.0.25[.0]
149 * 1.2.17 13 10217 12.so.0.17[.0]
150 * 1.0.26 10 10026 10.so.0.26[.0]
151 * 1.2.18 13 10218 12.so.0.18[.0]
152 * 1.2.19beta1-31 13 10219 12.so.0.19[.0]
153 * 1.0.27rc1-6 10 10027 10.so.0.27[.0]
154 * 1.2.19rc1-6 13 10219 12.so.0.19[.0]
155 * 1.0.27 10 10027 10.so.0.27[.0]
156 * 1.2.19 13 10219 12.so.0.19[.0]
157 * 1.2.20beta01-04 13 10220 12.so.0.20[.0]
158 * 1.0.28rc1-6 10 10028 10.so.0.28[.0]
159 * 1.2.20rc1-6 13 10220 12.so.0.20[.0]
160 * 1.0.28 10 10028 10.so.0.28[.0]
161 * 1.2.20 13 10220 12.so.0.20[.0]
162 * 1.2.21beta1-2 13 10221 12.so.0.21[.0]
163 * 1.2.21rc1-3 13 10221 12.so.0.21[.0]
164 * 1.0.29 10 10029 10.so.0.29[.0]
165 * 1.2.21 13 10221 12.so.0.21[.0]
166 * 1.2.22beta1-4 13 10222 12.so.0.22[.0]
167 * 1.0.30rc1 10 10030 10.so.0.30[.0]
168 * 1.2.22rc1 13 10222 12.so.0.22[.0]
169 * 1.0.30 10 10030 10.so.0.30[.0]
170 * 1.2.22 13 10222 12.so.0.22[.0]
171 * 1.2.23beta01-05 13 10223 12.so.0.23[.0]
172 * 1.2.23rc01 13 10223 12.so.0.23[.0]
173 * 1.2.23 13 10223 12.so.0.23[.0]
174 * 1.2.24beta01-02 13 10224 12.so.0.24[.0]
175 * 1.2.24rc01 13 10224 12.so.0.24[.0]
176 * 1.2.24 13 10224 12.so.0.24[.0]
177 * 1.2.25beta01-06 13 10225 12.so.0.25[.0]
178 * 1.2.25rc01-02 13 10225 12.so.0.25[.0]
179 * 1.0.31 10 10031 10.so.0.31[.0]
180 * 1.2.25 13 10225 12.so.0.25[.0]
181 * 1.2.26beta01-06 13 10226 12.so.0.26[.0]
182 * 1.2.26rc01 13 10226 12.so.0.26[.0]
183 * 1.2.26 13 10226 12.so.0.26[.0]
184 * 1.0.32 10 10032 10.so.0.32[.0]
185 * 1.2.27beta01-06 13 10227 12.so.0.27[.0]
186 * 1.2.27rc01 13 10227 12.so.0.27[.0]
187 * 1.0.33 10 10033 10.so.0.33[.0]
188 * 1.2.27 13 10227 12.so.0.27[.0]
189 * 1.0.34 10 10034 10.so.0.34[.0]
190 * 1.2.28 13 10228 12.so.0.28[.0]
191 * 1.2.29beta01-03 13 10229 12.so.0.29[.0]
192 * 1.2.29rc01 13 10229 12.so.0.29[.0]
193 * 1.0.35 10 10035 10.so.0.35[.0]
194 * 1.2.29 13 10229 12.so.0.29[.0]
195 * 1.0.37 10 10037 10.so.0.37[.0]
196 * 1.2.30beta01-04 13 10230 12.so.0.30[.0]
197 * 1.0.38rc01-08 10 10038 10.so.0.38[.0]
198 * 1.2.30rc01-08 13 10230 12.so.0.30[.0]
199 * 1.0.38 10 10038 10.so.0.38[.0]
200 * 1.2.30 13 10230 12.so.0.30[.0]
201 * 1.0.39rc01-03 10 10039 10.so.0.39[.0]
202 * 1.2.31rc01-03 13 10231 12.so.0.31[.0]
203 * 1.0.39 10 10039 10.so.0.39[.0]
204 * 1.2.31 13 10231 12.so.0.31[.0]
205 * 1.2.32beta01-02 13 10232 12.so.0.32[.0]
206 * 1.0.40rc01 10 10040 10.so.0.40[.0]
207 * 1.2.32rc01 13 10232 12.so.0.32[.0]
208 * 1.0.40 10 10040 10.so.0.40[.0]
209 * 1.2.32 13 10232 12.so.0.32[.0]
210 * 1.2.33beta01-02 13 10233 12.so.0.33[.0]
211 * 1.2.33rc01-02 13 10233 12.so.0.33[.0]
212 * 1.0.41rc01 10 10041 10.so.0.41[.0]
213 * 1.2.33 13 10233 12.so.0.33[.0]
214 * 1.0.41 10 10041 10.so.0.41[.0]
215 *
216 * Henceforth the source version will match the shared-library major
217 * and minor numbers; the shared-library major version number will be
218 * used for changes in backward compatibility, as it is intended. The
219 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
220 * for applications, is an unsigned integer of the form xyyzz corresponding
221 * to the source version x.y.z (leading zeros in y and z). Beta versions
222 * were given the previous public release number plus a letter, until
223 * version 1.0.6j; from then on they were given the upcoming public
224 * release number plus "betaNN" or "rcNN".
225 *
226 * Binary incompatibility exists only when applications make direct access
227 * to the info_ptr or png_ptr members through png.h, and the compiled
228 * application is loaded with a different version of the library.
229 *
230 * DLLNUM will change each time there are forward or backward changes
231 * in binary compatibility (e.g., when a new feature is added).
232 *
233 * See libpng.txt or libpng.3 for more information. The PNG specification
234 * is available as a W3C Recommendation and as an ISO Specification,
235 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
236 */
238 /*
239 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
240 *
241 * If you modify libpng you may insert additional notices immediately following
242 * this sentence.
243 *
244 * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are
245 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
246 * distributed according to the same disclaimer and license as libpng-1.2.5
247 * with the following individual added to the list of Contributing Authors:
248 *
249 * Cosmin Truta
250 *
251 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
252 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
253 * distributed according to the same disclaimer and license as libpng-1.0.6
254 * with the following individuals added to the list of Contributing Authors:
255 *
256 * Simon-Pierre Cadieux
257 * Eric S. Raymond
258 * Gilles Vollant
259 *
260 * and with the following additions to the disclaimer:
261 *
262 * There is no warranty against interference with your enjoyment of the
263 * library or against infringement. There is no warranty that our
264 * efforts or the library will fulfill any of your particular purposes
265 * or needs. This library is provided with all faults, and the entire
266 * risk of satisfactory quality, performance, accuracy, and effort is with
267 * the user.
268 *
269 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
270 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
271 * distributed according to the same disclaimer and license as libpng-0.96,
272 * with the following individuals added to the list of Contributing Authors:
273 *
274 * Tom Lane
275 * Glenn Randers-Pehrson
276 * Willem van Schaik
277 *
278 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
279 * Copyright (c) 1996, 1997 Andreas Dilger
280 * Distributed according to the same disclaimer and license as libpng-0.88,
281 * with the following individuals added to the list of Contributing Authors:
282 *
283 * John Bowler
284 * Kevin Bracey
285 * Sam Bushell
286 * Magnus Holmgren
287 * Greg Roelofs
288 * Tom Tanner
289 *
290 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
291 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
292 *
293 * For the purposes of this copyright and license, "Contributing Authors"
294 * is defined as the following set of individuals:
295 *
296 * Andreas Dilger
297 * Dave Martindale
298 * Guy Eric Schalnat
299 * Paul Schmidt
300 * Tim Wegner
301 *
302 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
303 * and Group 42, Inc. disclaim all warranties, expressed or implied,
304 * including, without limitation, the warranties of merchantability and of
305 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
306 * assume no liability for direct, indirect, incidental, special, exemplary,
307 * or consequential damages, which may result from the use of the PNG
308 * Reference Library, even if advised of the possibility of such damage.
309 *
310 * Permission is hereby granted to use, copy, modify, and distribute this
311 * source code, or portions hereof, for any purpose, without fee, subject
312 * to the following restrictions:
313 *
314 * 1. The origin of this source code must not be misrepresented.
315 *
316 * 2. Altered versions must be plainly marked as such and
317 * must not be misrepresented as being the original source.
318 *
319 * 3. This Copyright notice may not be removed or altered from
320 * any source or altered source distribution.
321 *
322 * The Contributing Authors and Group 42, Inc. specifically permit, without
323 * fee, and encourage the use of this source code as a component to
324 * supporting the PNG file format in commercial products. If you use this
325 * source code in a product, acknowledgment is not required but would be
326 * appreciated.
327 */
329 /*
330 * A "png_get_copyright" function is available, for convenient use in "about"
331 * boxes and the like:
332 *
333 * printf("%s",png_get_copyright(NULL));
334 *
335 * Also, the PNG logo (in PNG format, of course) is supplied in the
336 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
337 */
339 /*
340 * Libpng is OSI Certified Open Source Software. OSI Certified is a
341 * certification mark of the Open Source Initiative.
342 */
344 /*
345 * The contributing authors would like to thank all those who helped
346 * with testing, bug fixes, and patience. This wouldn't have been
347 * possible without all of you.
348 *
349 * Thanks to Frank J. T. Wojcik for helping with the documentation.
350 */
352 /*
353 * Y2K compliance in libpng:
354 * =========================
355 *
356 * October 31, 2008
357 *
358 * Since the PNG Development group is an ad-hoc body, we can't make
359 * an official declaration.
360 *
361 * This is your unofficial assurance that libpng from version 0.71 and
362 * upward through 1.2.33 are Y2K compliant. It is my belief that earlier
363 * versions were also Y2K compliant.
364 *
365 * Libpng only has three year fields. One is a 2-byte unsigned integer
366 * that will hold years up to 65535. The other two hold the date in text
367 * format, and will hold years up to 9999.
368 *
369 * The integer is
370 * "png_uint_16 year" in png_time_struct.
371 *
372 * The strings are
373 * "png_charp time_buffer" in png_struct and
374 * "near_time_buffer", which is a local character string in png.c.
375 *
376 * There are seven time-related functions:
377 * png.c: png_convert_to_rfc_1123() in png.c
378 * (formerly png_convert_to_rfc_1152() in error)
379 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
380 * png_convert_from_time_t() in pngwrite.c
381 * png_get_tIME() in pngget.c
382 * png_handle_tIME() in pngrutil.c, called in pngread.c
383 * png_set_tIME() in pngset.c
384 * png_write_tIME() in pngwutil.c, called in pngwrite.c
385 *
386 * All handle dates properly in a Y2K environment. The
387 * png_convert_from_time_t() function calls gmtime() to convert from system
388 * clock time, which returns (year - 1900), which we properly convert to
389 * the full 4-digit year. There is a possibility that applications using
390 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
391 * function, or that they are incorrectly passing only a 2-digit year
392 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
393 * but this is not under our control. The libpng documentation has always
394 * stated that it works with 4-digit years, and the APIs have been
395 * documented as such.
396 *
397 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
398 * integer to hold the year, and can hold years as large as 65535.
399 *
400 * zlib, upon which libpng depends, is also Y2K compliant. It contains
401 * no date-related code.
402 *
403 * Glenn Randers-Pehrson
404 * libpng maintainer
405 * PNG Development Group
406 */
408 #ifndef PNG_H
409 #define PNG_H
411 /* This is not the place to learn how to use libpng. The file libpng.txt
412 * describes how to use libpng, and the file example.c summarizes it
413 * with some code on which to build. This file is useful for looking
414 * at the actual function definitions and structure components.
415 */
417 /* Version information for png.h - this should match the version in png.c */
418 #define PNG_LIBPNG_VER_STRING "1.2.33"
419 #define PNG_HEADER_VERSION_STRING \
420 " libpng version 1.2.33 - October 31, 2008\n"
422 #define PNG_LIBPNG_VER_SONUM 0
423 #define PNG_LIBPNG_VER_DLLNUM 13
425 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
426 #define PNG_LIBPNG_VER_MAJOR 1
427 #define PNG_LIBPNG_VER_MINOR 2
428 #define PNG_LIBPNG_VER_RELEASE 33
429 /* This should match the numeric part of the final component of
430 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
432 #define PNG_LIBPNG_VER_BUILD 0
434 /* Release Status */
435 #define PNG_LIBPNG_BUILD_ALPHA 1
436 #define PNG_LIBPNG_BUILD_BETA 2
437 #define PNG_LIBPNG_BUILD_RC 3
438 #define PNG_LIBPNG_BUILD_STABLE 4
439 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
441 /* Release-Specific Flags */
442 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
443 PNG_LIBPNG_BUILD_STABLE only */
444 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
445 PNG_LIBPNG_BUILD_SPECIAL */
446 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
447 PNG_LIBPNG_BUILD_PRIVATE */
449 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
451 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
452 * We must not include leading zeros.
453 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
454 * version 1.0.0 was mis-numbered 100 instead of 10000). From
455 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
456 #define PNG_LIBPNG_VER 10233 /* 1.2.33 */
458 #ifndef PNG_VERSION_INFO_ONLY
459 /* include the compression library's header */
460 #include "zlib.h"
461 #endif
463 /* include all user configurable info, including optional assembler routines */
464 #include "pngconf.h"
466 /*
467 * Added at libpng-1.2.8 */
468 /* Ref MSDN: Private as priority over Special
469 * VS_FF_PRIVATEBUILD File *was not* built using standard release
470 * procedures. If this value is given, the StringFileInfo block must
471 * contain a PrivateBuild string.
472 *
473 * VS_FF_SPECIALBUILD File *was* built by the original company using
474 * standard release procedures but is a variation of the standard
475 * file of the same version number. If this value is given, the
476 * StringFileInfo block must contain a SpecialBuild string.
477 */
479 #if defined(PNG_USER_PRIVATEBUILD)
480 # define PNG_LIBPNG_BUILD_TYPE \
481 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
482 #else
483 # if defined(PNG_LIBPNG_SPECIALBUILD)
484 # define PNG_LIBPNG_BUILD_TYPE \
485 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
486 # else
487 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
488 # endif
489 #endif
491 #ifndef PNG_VERSION_INFO_ONLY
493 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
494 #ifdef __cplusplus
495 extern "C" {
496 #endif /* __cplusplus */
498 /* This file is arranged in several sections. The first section contains
499 * structure and type definitions. The second section contains the external
500 * library functions, while the third has the internal library functions,
501 * which applications aren't expected to use directly.
502 */
504 #ifndef PNG_NO_TYPECAST_NULL
505 #define int_p_NULL (int *)NULL
506 #define png_bytep_NULL (png_bytep)NULL
507 #define png_bytepp_NULL (png_bytepp)NULL
508 #define png_doublep_NULL (png_doublep)NULL
509 #define png_error_ptr_NULL (png_error_ptr)NULL
510 #define png_flush_ptr_NULL (png_flush_ptr)NULL
511 #define png_free_ptr_NULL (png_free_ptr)NULL
512 #define png_infopp_NULL (png_infopp)NULL
513 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
514 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
515 #define png_rw_ptr_NULL (png_rw_ptr)NULL
516 #define png_structp_NULL (png_structp)NULL
517 #define png_uint_16p_NULL (png_uint_16p)NULL
518 #define png_voidp_NULL (png_voidp)NULL
519 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
520 #else
521 #define int_p_NULL NULL
522 #define png_bytep_NULL NULL
523 #define png_bytepp_NULL NULL
524 #define png_doublep_NULL NULL
525 #define png_error_ptr_NULL NULL
526 #define png_flush_ptr_NULL NULL
527 #define png_free_ptr_NULL NULL
528 #define png_infopp_NULL NULL
529 #define png_malloc_ptr_NULL NULL
530 #define png_read_status_ptr_NULL NULL
531 #define png_rw_ptr_NULL NULL
532 #define png_structp_NULL NULL
533 #define png_uint_16p_NULL NULL
534 #define png_voidp_NULL NULL
535 #define png_write_status_ptr_NULL NULL
536 #endif
538 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
539 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
540 /* Version information for C files, stored in png.c. This had better match
541 * the version above.
542 */
543 #ifdef PNG_USE_GLOBAL_ARRAYS
544 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
545 /* need room for 99.99.99beta99z */
546 #else
547 #define png_libpng_ver png_get_header_ver(NULL)
548 #endif
550 #ifdef PNG_USE_GLOBAL_ARRAYS
551 /* This was removed in version 1.0.5c */
552 /* Structures to facilitate easy interlacing. See png.c for more details */
553 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
554 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
555 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
556 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
557 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
558 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
559 /* This isn't currently used. If you need it, see png.c for more details.
560 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
561 */
562 #endif
564 #endif /* PNG_NO_EXTERN */
566 /* Three color definitions. The order of the red, green, and blue, (and the
567 * exact size) is not important, although the size of the fields need to
568 * be png_byte or png_uint_16 (as defined below).
569 */
570 typedef struct png_color_struct
571 {
572 png_byte red;
573 png_byte green;
574 png_byte blue;
575 } png_color;
576 typedef png_color FAR * png_colorp;
577 typedef png_color FAR * FAR * png_colorpp;
579 typedef struct png_color_16_struct
580 {
581 png_byte index; /* used for palette files */
582 png_uint_16 red; /* for use in red green blue files */
583 png_uint_16 green;
584 png_uint_16 blue;
585 png_uint_16 gray; /* for use in grayscale files */
586 } png_color_16;
587 typedef png_color_16 FAR * png_color_16p;
588 typedef png_color_16 FAR * FAR * png_color_16pp;
590 typedef struct png_color_8_struct
591 {
592 png_byte red; /* for use in red green blue files */
593 png_byte green;
594 png_byte blue;
595 png_byte gray; /* for use in grayscale files */
596 png_byte alpha; /* for alpha channel files */
597 } png_color_8;
598 typedef png_color_8 FAR * png_color_8p;
599 typedef png_color_8 FAR * FAR * png_color_8pp;
601 /*
602 * The following two structures are used for the in-core representation
603 * of sPLT chunks.
604 */
605 typedef struct png_sPLT_entry_struct
606 {
607 png_uint_16 red;
608 png_uint_16 green;
609 png_uint_16 blue;
610 png_uint_16 alpha;
611 png_uint_16 frequency;
612 } png_sPLT_entry;
613 typedef png_sPLT_entry FAR * png_sPLT_entryp;
614 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
616 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
617 * occupy the LSB of their respective members, and the MSB of each member
618 * is zero-filled. The frequency member always occupies the full 16 bits.
619 */
621 typedef struct png_sPLT_struct
622 {
623 png_charp name; /* palette name */
624 png_byte depth; /* depth of palette samples */
625 png_sPLT_entryp entries; /* palette entries */
626 png_int_32 nentries; /* number of palette entries */
627 } png_sPLT_t;
628 typedef png_sPLT_t FAR * png_sPLT_tp;
629 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
631 #ifdef PNG_TEXT_SUPPORTED
632 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
633 * and whether that contents is compressed or not. The "key" field
634 * points to a regular zero-terminated C string. The "text", "lang", and
635 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
636 * However, the * structure returned by png_get_text() will always contain
637 * regular zero-terminated C strings (possibly empty), never NULL pointers,
638 * so they can be safely used in printf() and other string-handling functions.
639 */
640 typedef struct png_text_struct
641 {
642 int compression; /* compression value:
643 -1: tEXt, none
644 0: zTXt, deflate
645 1: iTXt, none
646 2: iTXt, deflate */
647 png_charp key; /* keyword, 1-79 character description of "text" */
648 png_charp text; /* comment, may be an empty string (ie "")
649 or a NULL pointer */
650 png_size_t text_length; /* length of the text string */
651 #ifdef PNG_iTXt_SUPPORTED
652 png_size_t itxt_length; /* length of the itxt string */
653 png_charp lang; /* language code, 0-79 characters
654 or a NULL pointer */
655 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
656 chars or a NULL pointer */
657 #endif
658 } png_text;
659 typedef png_text FAR * png_textp;
660 typedef png_text FAR * FAR * png_textpp;
661 #endif
663 /* Supported compression types for text in PNG files (tEXt, and zTXt).
664 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
665 #define PNG_TEXT_COMPRESSION_NONE_WR -3
666 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
667 #define PNG_TEXT_COMPRESSION_NONE -1
668 #define PNG_TEXT_COMPRESSION_zTXt 0
669 #define PNG_ITXT_COMPRESSION_NONE 1
670 #define PNG_ITXT_COMPRESSION_zTXt 2
671 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
673 /* png_time is a way to hold the time in an machine independent way.
674 * Two conversions are provided, both from time_t and struct tm. There
675 * is no portable way to convert to either of these structures, as far
676 * as I know. If you know of a portable way, send it to me. As a side
677 * note - PNG has always been Year 2000 compliant!
678 */
679 typedef struct png_time_struct
680 {
681 png_uint_16 year; /* full year, as in, 1995 */
682 png_byte month; /* month of year, 1 - 12 */
683 png_byte day; /* day of month, 1 - 31 */
684 png_byte hour; /* hour of day, 0 - 23 */
685 png_byte minute; /* minute of hour, 0 - 59 */
686 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
687 } png_time;
688 typedef png_time FAR * png_timep;
689 typedef png_time FAR * FAR * png_timepp;
691 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
692 /* png_unknown_chunk is a structure to hold queued chunks for which there is
693 * no specific support. The idea is that we can use this to queue
694 * up private chunks for output even though the library doesn't actually
695 * know about their semantics.
696 */
697 #define PNG_CHUNK_NAME_LENGTH 5
698 typedef struct png_unknown_chunk_t
699 {
700 png_byte name[PNG_CHUNK_NAME_LENGTH];
701 png_byte *data;
702 png_size_t size;
704 /* libpng-using applications should NOT directly modify this byte. */
705 png_byte location; /* mode of operation at read time */
706 }
707 png_unknown_chunk;
708 typedef png_unknown_chunk FAR * png_unknown_chunkp;
709 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
710 #endif
712 /* png_info is a structure that holds the information in a PNG file so
713 * that the application can find out the characteristics of the image.
714 * If you are reading the file, this structure will tell you what is
715 * in the PNG file. If you are writing the file, fill in the information
716 * you want to put into the PNG file, then call png_write_info().
717 * The names chosen should be very close to the PNG specification, so
718 * consult that document for information about the meaning of each field.
719 *
720 * With libpng < 0.95, it was only possible to directly set and read the
721 * the values in the png_info_struct, which meant that the contents and
722 * order of the values had to remain fixed. With libpng 0.95 and later,
723 * however, there are now functions that abstract the contents of
724 * png_info_struct from the application, so this makes it easier to use
725 * libpng with dynamic libraries, and even makes it possible to use
726 * libraries that don't have all of the libpng ancillary chunk-handing
727 * functionality.
728 *
729 * In any case, the order of the parameters in png_info_struct should NOT
730 * be changed for as long as possible to keep compatibility with applications
731 * that use the old direct-access method with png_info_struct.
732 *
733 * The following members may have allocated storage attached that should be
734 * cleaned up before the structure is discarded: palette, trans, text,
735 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
736 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
737 * are automatically freed when the info structure is deallocated, if they were
738 * allocated internally by libpng. This behavior can be changed by means
739 * of the png_data_freer() function.
740 *
741 * More allocation details: all the chunk-reading functions that
742 * change these members go through the corresponding png_set_*
743 * functions. A function to clear these members is available: see
744 * png_free_data(). The png_set_* functions do not depend on being
745 * able to point info structure members to any of the storage they are
746 * passed (they make their own copies), EXCEPT that the png_set_text
747 * functions use the same storage passed to them in the text_ptr or
748 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
749 * functions do not make their own copies.
750 */
751 typedef struct png_info_struct
752 {
753 /* the following are necessary for every PNG file */
754 png_uint_32 width; /* width of image in pixels (from IHDR) */
755 png_uint_32 height; /* height of image in pixels (from IHDR) */
756 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
757 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
758 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
759 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
760 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
761 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
762 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
763 /* The following three should have been named *_method not *_type */
764 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
765 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
766 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
768 /* The following is informational only on read, and not used on writes. */
769 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
770 png_byte pixel_depth; /* number of bits per pixel */
771 png_byte spare_byte; /* to align the data, and for future use */
772 png_byte signature[8]; /* magic bytes read by libpng from start of file */
774 /* The rest of the data is optional. If you are reading, check the
775 * valid field to see if the information in these are valid. If you
776 * are writing, set the valid field to those chunks you want written,
777 * and initialize the appropriate fields below.
778 */
780 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
781 /* The gAMA chunk describes the gamma characteristics of the system
782 * on which the image was created, normally in the range [1.0, 2.5].
783 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
784 */
785 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
786 #endif
788 #if defined(PNG_sRGB_SUPPORTED)
789 /* GR-P, 0.96a */
790 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
791 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
792 #endif
794 #if defined(PNG_TEXT_SUPPORTED)
795 /* The tEXt, and zTXt chunks contain human-readable textual data in
796 * uncompressed, compressed, and optionally compressed forms, respectively.
797 * The data in "text" is an array of pointers to uncompressed,
798 * null-terminated C strings. Each chunk has a keyword that describes the
799 * textual data contained in that chunk. Keywords are not required to be
800 * unique, and the text string may be empty. Any number of text chunks may
801 * be in an image.
802 */
803 int num_text; /* number of comments read/to write */
804 int max_text; /* current size of text array */
805 png_textp text; /* array of comments read/to write */
806 #endif /* PNG_TEXT_SUPPORTED */
808 #if defined(PNG_tIME_SUPPORTED)
809 /* The tIME chunk holds the last time the displayed image data was
810 * modified. See the png_time struct for the contents of this struct.
811 */
812 png_time mod_time;
813 #endif
815 #if defined(PNG_sBIT_SUPPORTED)
816 /* The sBIT chunk specifies the number of significant high-order bits
817 * in the pixel data. Values are in the range [1, bit_depth], and are
818 * only specified for the channels in the pixel data. The contents of
819 * the low-order bits is not specified. Data is valid if
820 * (valid & PNG_INFO_sBIT) is non-zero.
821 */
822 png_color_8 sig_bit; /* significant bits in color channels */
823 #endif
825 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
826 defined(PNG_READ_BACKGROUND_SUPPORTED)
827 /* The tRNS chunk supplies transparency data for paletted images and
828 * other image types that don't need a full alpha channel. There are
829 * "num_trans" transparency values for a paletted image, stored in the
830 * same order as the palette colors, starting from index 0. Values
831 * for the data are in the range [0, 255], ranging from fully transparent
832 * to fully opaque, respectively. For non-paletted images, there is a
833 * single color specified that should be treated as fully transparent.
834 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
835 */
836 png_bytep trans; /* transparent values for paletted image */
837 png_color_16 trans_values; /* transparent color for non-palette image */
838 #endif
840 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
841 /* The bKGD chunk gives the suggested image background color if the
842 * display program does not have its own background color and the image
843 * is needs to composited onto a background before display. The colors
844 * in "background" are normally in the same color space/depth as the
845 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
846 */
847 png_color_16 background;
848 #endif
850 #if defined(PNG_oFFs_SUPPORTED)
851 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
852 * and downwards from the top-left corner of the display, page, or other
853 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
854 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
855 */
856 png_int_32 x_offset; /* x offset on page */
857 png_int_32 y_offset; /* y offset on page */
858 png_byte offset_unit_type; /* offset units type */
859 #endif
861 #if defined(PNG_pHYs_SUPPORTED)
862 /* The pHYs chunk gives the physical pixel density of the image for
863 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
864 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
865 */
866 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
867 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
868 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
869 #endif
871 #if defined(PNG_hIST_SUPPORTED)
872 /* The hIST chunk contains the relative frequency or importance of the
873 * various palette entries, so that a viewer can intelligently select a
874 * reduced-color palette, if required. Data is an array of "num_palette"
875 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
876 * is non-zero.
877 */
878 png_uint_16p hist;
879 #endif
881 #ifdef PNG_cHRM_SUPPORTED
882 /* The cHRM chunk describes the CIE color characteristics of the monitor
883 * on which the PNG was created. This data allows the viewer to do gamut
884 * mapping of the input image to ensure that the viewer sees the same
885 * colors in the image as the creator. Values are in the range
886 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
887 */
888 #ifdef PNG_FLOATING_POINT_SUPPORTED
889 float x_white;
890 float y_white;
891 float x_red;
892 float y_red;
893 float x_green;
894 float y_green;
895 float x_blue;
896 float y_blue;
897 #endif
898 #endif
900 #if defined(PNG_pCAL_SUPPORTED)
901 /* The pCAL chunk describes a transformation between the stored pixel
902 * values and original physical data values used to create the image.
903 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
904 * range given by [pcal_X0, pcal_X1], and are further transformed by a
905 * (possibly non-linear) transformation function given by "pcal_type"
906 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
907 * defines below, and the PNG-Group's PNG extensions document for a
908 * complete description of the transformations and how they should be
909 * implemented, and for a description of the ASCII parameter strings.
910 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
911 */
912 png_charp pcal_purpose; /* pCAL chunk description string */
913 png_int_32 pcal_X0; /* minimum value */
914 png_int_32 pcal_X1; /* maximum value */
915 png_charp pcal_units; /* Latin-1 string giving physical units */
916 png_charpp pcal_params; /* ASCII strings containing parameter values */
917 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
918 png_byte pcal_nparams; /* number of parameters given in pcal_params */
919 #endif
921 /* New members added in libpng-1.0.6 */
922 #ifdef PNG_FREE_ME_SUPPORTED
923 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
924 #endif
926 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
927 /* storage for unknown chunks that the library doesn't recognize. */
928 png_unknown_chunkp unknown_chunks;
929 png_size_t unknown_chunks_num;
930 #endif
932 #if defined(PNG_iCCP_SUPPORTED)
933 /* iCCP chunk data. */
934 png_charp iccp_name; /* profile name */
935 png_charp iccp_profile; /* International Color Consortium profile data */
936 /* Note to maintainer: should be png_bytep */
937 png_uint_32 iccp_proflen; /* ICC profile data length */
938 png_byte iccp_compression; /* Always zero */
939 #endif
941 #if defined(PNG_sPLT_SUPPORTED)
942 /* data on sPLT chunks (there may be more than one). */
943 png_sPLT_tp splt_palettes;
944 png_uint_32 splt_palettes_num;
945 #endif
947 #if defined(PNG_sCAL_SUPPORTED)
948 /* The sCAL chunk describes the actual physical dimensions of the
949 * subject matter of the graphic. The chunk contains a unit specification
950 * a byte value, and two ASCII strings representing floating-point
951 * values. The values are width and height corresponsing to one pixel
952 * in the image. This external representation is converted to double
953 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
954 */
955 png_byte scal_unit; /* unit of physical scale */
956 #ifdef PNG_FLOATING_POINT_SUPPORTED
957 double scal_pixel_width; /* width of one pixel */
958 double scal_pixel_height; /* height of one pixel */
959 #endif
960 #ifdef PNG_FIXED_POINT_SUPPORTED
961 png_charp scal_s_width; /* string containing height */
962 png_charp scal_s_height; /* string containing width */
963 #endif
964 #endif
966 #if defined(PNG_INFO_IMAGE_SUPPORTED)
967 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
968 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
969 png_bytepp row_pointers; /* the image bits */
970 #endif
972 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
973 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
974 #endif
976 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
977 png_fixed_point int_x_white;
978 png_fixed_point int_y_white;
979 png_fixed_point int_x_red;
980 png_fixed_point int_y_red;
981 png_fixed_point int_x_green;
982 png_fixed_point int_y_green;
983 png_fixed_point int_x_blue;
984 png_fixed_point int_y_blue;
985 #endif
987 } png_info;
989 typedef png_info FAR * png_infop;
990 typedef png_info FAR * FAR * png_infopp;
992 /* Maximum positive integer used in PNG is (2^31)-1 */
993 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
994 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
995 #define PNG_SIZE_MAX ((png_size_t)(-1))
996 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
997 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
998 #define PNG_MAX_UINT PNG_UINT_31_MAX
999 #endif
1001 /* These describe the color_type field in png_info. */
1002 /* color type masks */
1003 #define PNG_COLOR_MASK_PALETTE 1
1004 #define PNG_COLOR_MASK_COLOR 2
1005 #define PNG_COLOR_MASK_ALPHA 4
1007 /* color types. Note that not all combinations are legal */
1008 #define PNG_COLOR_TYPE_GRAY 0
1009 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
1010 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
1011 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
1012 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
1013 /* aliases */
1014 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
1015 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
1017 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
1018 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
1019 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1021 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
1022 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1023 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1024 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1026 /* These are for the interlacing type. These values should NOT be changed. */
1027 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1028 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1029 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
1031 /* These are for the oFFs chunk. These values should NOT be changed. */
1032 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1033 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1034 #define PNG_OFFSET_LAST 2 /* Not a valid value */
1036 /* These are for the pCAL chunk. These values should NOT be changed. */
1037 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1038 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1039 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1040 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1041 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1043 /* These are for the sCAL chunk. These values should NOT be changed. */
1044 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1045 #define PNG_SCALE_METER 1 /* meters per pixel */
1046 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1047 #define PNG_SCALE_LAST 3 /* Not a valid value */
1049 /* These are for the pHYs chunk. These values should NOT be changed. */
1050 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1051 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1052 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1054 /* These are for the sRGB chunk. These values should NOT be changed. */
1055 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1056 #define PNG_sRGB_INTENT_RELATIVE 1
1057 #define PNG_sRGB_INTENT_SATURATION 2
1058 #define PNG_sRGB_INTENT_ABSOLUTE 3
1059 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1061 /* This is for text chunks */
1062 #define PNG_KEYWORD_MAX_LENGTH 79
1064 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1065 #define PNG_MAX_PALETTE_LENGTH 256
1067 /* These determine if an ancillary chunk's data has been successfully read
1068 * from the PNG header, or if the application has filled in the corresponding
1069 * data in the info_struct to be written into the output file. The values
1070 * of the PNG_INFO_<chunk> defines should NOT be changed.
1071 */
1072 #define PNG_INFO_gAMA 0x0001
1073 #define PNG_INFO_sBIT 0x0002
1074 #define PNG_INFO_cHRM 0x0004
1075 #define PNG_INFO_PLTE 0x0008
1076 #define PNG_INFO_tRNS 0x0010
1077 #define PNG_INFO_bKGD 0x0020
1078 #define PNG_INFO_hIST 0x0040
1079 #define PNG_INFO_pHYs 0x0080
1080 #define PNG_INFO_oFFs 0x0100
1081 #define PNG_INFO_tIME 0x0200
1082 #define PNG_INFO_pCAL 0x0400
1083 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1084 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1085 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1086 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1087 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1089 /* This is used for the transformation routines, as some of them
1090 * change these values for the row. It also should enable using
1091 * the routines for other purposes.
1092 */
1093 typedef struct png_row_info_struct
1094 {
1095 png_uint_32 width; /* width of row */
1096 png_uint_32 rowbytes; /* number of bytes in row */
1097 png_byte color_type; /* color type of row */
1098 png_byte bit_depth; /* bit depth of row */
1099 png_byte channels; /* number of channels (1, 2, 3, or 4) */
1100 png_byte pixel_depth; /* bits per pixel (depth * channels) */
1101 } png_row_info;
1103 typedef png_row_info FAR * png_row_infop;
1104 typedef png_row_info FAR * FAR * png_row_infopp;
1106 /* These are the function types for the I/O functions and for the functions
1107 * that allow the user to override the default I/O functions with his or her
1108 * own. The png_error_ptr type should match that of user-supplied warning
1109 * and error functions, while the png_rw_ptr type should match that of the
1110 * user read/write data functions.
1111 */
1112 typedef struct png_struct_def png_struct;
1113 typedef png_struct FAR * png_structp;
1115 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1116 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1117 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1118 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1119 int));
1120 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1121 int));
1123 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1124 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1125 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1126 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1127 png_uint_32, int));
1128 #endif
1130 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1131 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1132 defined(PNG_LEGACY_SUPPORTED)
1133 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1134 png_row_infop, png_bytep));
1135 #endif
1137 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1138 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1139 #endif
1140 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1141 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1142 #endif
1144 /* Transform masks for the high-level interface */
1145 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1146 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1147 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1148 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1149 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1150 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1151 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1152 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1153 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1154 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1155 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1156 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1157 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1159 /* Flags for MNG supported features */
1160 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1161 #define PNG_FLAG_MNG_FILTER_64 0x04
1162 #define PNG_ALL_MNG_FEATURES 0x05
1164 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1165 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1167 /* The structure that holds the information to read and write PNG files.
1168 * The only people who need to care about what is inside of this are the
1169 * people who will be modifying the library for their own special needs.
1170 * It should NOT be accessed directly by an application, except to store
1171 * the jmp_buf.
1172 */
1174 struct png_struct_def
1175 {
1176 #ifdef PNG_SETJMP_SUPPORTED
1177 jmp_buf jmpbuf; /* used in png_error */
1178 #endif
1179 png_error_ptr error_fn; /* function for printing errors and aborting */
1180 png_error_ptr warning_fn; /* function for printing warnings */
1181 png_voidp error_ptr; /* user supplied struct for error functions */
1182 png_rw_ptr write_data_fn; /* function for writing output data */
1183 png_rw_ptr read_data_fn; /* function for reading input data */
1184 png_voidp io_ptr; /* ptr to application struct for I/O functions */
1186 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1187 png_user_transform_ptr read_user_transform_fn; /* user read transform */
1188 #endif
1190 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1191 png_user_transform_ptr write_user_transform_fn; /* user write transform */
1192 #endif
1194 /* These were added in libpng-1.0.2 */
1195 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1196 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1197 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1198 png_voidp user_transform_ptr; /* user supplied struct for user transform */
1199 png_byte user_transform_depth; /* bit depth of user transformed pixels */
1200 png_byte user_transform_channels; /* channels in user transformed pixels */
1201 #endif
1202 #endif
1204 png_uint_32 mode; /* tells us where we are in the PNG file */
1205 png_uint_32 flags; /* flags indicating various things to libpng */
1206 png_uint_32 transformations; /* which transformations to perform */
1208 z_stream zstream; /* pointer to decompression structure (below) */
1209 png_bytep zbuf; /* buffer for zlib */
1210 png_size_t zbuf_size; /* size of zbuf */
1211 int zlib_level; /* holds zlib compression level */
1212 int zlib_method; /* holds zlib compression method */
1213 int zlib_window_bits; /* holds zlib compression window bits */
1214 int zlib_mem_level; /* holds zlib compression memory level */
1215 int zlib_strategy; /* holds zlib compression strategy */
1217 png_uint_32 width; /* width of image in pixels */
1218 png_uint_32 height; /* height of image in pixels */
1219 png_uint_32 num_rows; /* number of rows in current pass */
1220 png_uint_32 usr_width; /* width of row at start of write */
1221 png_uint_32 rowbytes; /* size of row in bytes */
1222 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1223 png_uint_32 iwidth; /* width of current interlaced row in pixels */
1224 png_uint_32 row_number; /* current row in interlace pass */
1225 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1226 png_bytep row_buf; /* buffer to save current (unfiltered) row */
1227 #ifndef PNG_NO_WRITE_FILTER
1228 png_bytep sub_row; /* buffer to save "sub" row when filtering */
1229 png_bytep up_row; /* buffer to save "up" row when filtering */
1230 png_bytep avg_row; /* buffer to save "avg" row when filtering */
1231 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1232 #endif
1233 png_row_info row_info; /* used for transformation routines */
1235 png_uint_32 idat_size; /* current IDAT size for read */
1236 png_uint_32 crc; /* current chunk CRC value */
1237 png_colorp palette; /* palette from the input file */
1238 png_uint_16 num_palette; /* number of color entries in palette */
1239 png_uint_16 num_trans; /* number of transparency values */
1240 png_byte chunk_name[5]; /* null-terminated name of current chunk */
1241 png_byte compression; /* file compression type (always 0) */
1242 png_byte filter; /* file filter type (always 0) */
1243 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1244 png_byte pass; /* current interlace pass (0 - 6) */
1245 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1246 png_byte color_type; /* color type of file */
1247 png_byte bit_depth; /* bit depth of file */
1248 png_byte usr_bit_depth; /* bit depth of users row */
1249 png_byte pixel_depth; /* number of bits per pixel */
1250 png_byte channels; /* number of channels in file */
1251 png_byte usr_channels; /* channels at start of write */
1252 png_byte sig_bytes; /* magic bytes read/written from start of file */
1254 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1255 #ifdef PNG_LEGACY_SUPPORTED
1256 png_byte filler; /* filler byte for pixel expansion */
1257 #else
1258 png_uint_16 filler; /* filler bytes for pixel expansion */
1259 #endif
1260 #endif
1262 #if defined(PNG_bKGD_SUPPORTED)
1263 png_byte background_gamma_type;
1264 # ifdef PNG_FLOATING_POINT_SUPPORTED
1265 float background_gamma;
1266 # endif
1267 png_color_16 background; /* background color in screen gamma space */
1268 #if defined(PNG_READ_GAMMA_SUPPORTED)
1269 png_color_16 background_1; /* background normalized to gamma 1.0 */
1270 #endif
1271 #endif /* PNG_bKGD_SUPPORTED */
1273 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1274 png_flush_ptr output_flush_fn;/* Function for flushing output */
1275 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1276 png_uint_32 flush_rows; /* number of rows written since last flush */
1277 #endif
1279 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1280 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1281 #ifdef PNG_FLOATING_POINT_SUPPORTED
1282 float gamma; /* file gamma value */
1283 float screen_gamma; /* screen gamma value (display_exponent) */
1284 #endif
1285 #endif
1287 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1288 png_bytep gamma_table; /* gamma table for 8-bit depth files */
1289 png_bytep gamma_from_1; /* converts from 1.0 to screen */
1290 png_bytep gamma_to_1; /* converts from file to 1.0 */
1291 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1292 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1293 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1294 #endif
1296 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1297 png_color_8 sig_bit; /* significant bits in each available channel */
1298 #endif
1300 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1301 png_color_8 shift; /* shift for significant bit tranformation */
1302 #endif
1304 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1305 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1306 png_bytep trans; /* transparency values for paletted files */
1307 png_color_16 trans_values; /* transparency values for non-paletted files */
1308 #endif
1310 png_read_status_ptr read_row_fn; /* called after each row is decoded */
1311 png_write_status_ptr write_row_fn; /* called after each row is encoded */
1312 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1313 png_progressive_info_ptr info_fn; /* called after header data fully read */
1314 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1315 png_progressive_end_ptr end_fn; /* called after image is complete */
1316 png_bytep save_buffer_ptr; /* current location in save_buffer */
1317 png_bytep save_buffer; /* buffer for previously read data */
1318 png_bytep current_buffer_ptr; /* current location in current_buffer */
1319 png_bytep current_buffer; /* buffer for recently used data */
1320 png_uint_32 push_length; /* size of current input chunk */
1321 png_uint_32 skip_length; /* bytes to skip in input data */
1322 png_size_t save_buffer_size; /* amount of data now in save_buffer */
1323 png_size_t save_buffer_max; /* total size of save_buffer */
1324 png_size_t buffer_size; /* total amount of available input data */
1325 png_size_t current_buffer_size; /* amount of data now in current_buffer */
1326 int process_mode; /* what push library is currently doing */
1327 int cur_palette; /* current push library palette index */
1329 # if defined(PNG_TEXT_SUPPORTED)
1330 png_size_t current_text_size; /* current size of text input data */
1331 png_size_t current_text_left; /* how much text left to read in input */
1332 png_charp current_text; /* current text chunk buffer */
1333 png_charp current_text_ptr; /* current location in current_text */
1334 # endif /* PNG_TEXT_SUPPORTED */
1335 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1337 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1338 /* for the Borland special 64K segment handler */
1339 png_bytepp offset_table_ptr;
1340 png_bytep offset_table;
1341 png_uint_16 offset_table_number;
1342 png_uint_16 offset_table_count;
1343 png_uint_16 offset_table_count_free;
1344 #endif
1346 #if defined(PNG_READ_DITHER_SUPPORTED)
1347 png_bytep palette_lookup; /* lookup table for dithering */
1348 png_bytep dither_index; /* index translation for palette files */
1349 #endif
1351 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1352 png_uint_16p hist; /* histogram */
1353 #endif
1355 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1356 png_byte heuristic_method; /* heuristic for row filter selection */
1357 png_byte num_prev_filters; /* number of weights for previous rows */
1358 png_bytep prev_filters; /* filter type(s) of previous row(s) */
1359 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1360 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1361 png_uint_16p filter_costs; /* relative filter calculation cost */
1362 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1363 #endif
1365 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1366 png_charp time_buffer; /* String to hold RFC 1123 time text */
1367 #endif
1369 /* New members added in libpng-1.0.6 */
1371 #ifdef PNG_FREE_ME_SUPPORTED
1372 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1373 #endif
1375 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1376 png_voidp user_chunk_ptr;
1377 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1378 #endif
1380 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1381 int num_chunk_list;
1382 png_bytep chunk_list;
1383 #endif
1385 /* New members added in libpng-1.0.3 */
1386 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1387 png_byte rgb_to_gray_status;
1388 /* These were changed from png_byte in libpng-1.0.6 */
1389 png_uint_16 rgb_to_gray_red_coeff;
1390 png_uint_16 rgb_to_gray_green_coeff;
1391 png_uint_16 rgb_to_gray_blue_coeff;
1392 #endif
1394 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1395 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1396 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1397 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1398 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1399 #ifdef PNG_1_0_X
1400 png_byte mng_features_permitted;
1401 #else
1402 png_uint_32 mng_features_permitted;
1403 #endif /* PNG_1_0_X */
1404 #endif
1406 /* New member added in libpng-1.0.7 */
1407 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1408 png_fixed_point int_gamma;
1409 #endif
1411 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1412 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1413 png_byte filter_type;
1414 #endif
1416 #if defined(PNG_1_0_X)
1417 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1418 png_uint_32 row_buf_size;
1419 #endif
1421 /* New members added in libpng-1.2.0 */
1422 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1423 # if !defined(PNG_1_0_X)
1424 # if defined(PNG_MMX_CODE_SUPPORTED)
1425 png_byte mmx_bitdepth_threshold;
1426 png_uint_32 mmx_rowbytes_threshold;
1427 # endif
1428 png_uint_32 asm_flags;
1429 # endif
1430 #endif
1432 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1433 #ifdef PNG_USER_MEM_SUPPORTED
1434 png_voidp mem_ptr; /* user supplied struct for mem functions */
1435 png_malloc_ptr malloc_fn; /* function for allocating memory */
1436 png_free_ptr free_fn; /* function for freeing memory */
1437 #endif
1439 /* New member added in libpng-1.0.13 and 1.2.0 */
1440 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1442 #if defined(PNG_READ_DITHER_SUPPORTED)
1443 /* The following three members were added at version 1.0.14 and 1.2.4 */
1444 png_bytep dither_sort; /* working sort array */
1445 png_bytep index_to_palette; /* where the original index currently is */
1446 /* in the palette */
1447 png_bytep palette_to_index; /* which original index points to this */
1448 /* palette color */
1449 #endif
1451 /* New members added in libpng-1.0.16 and 1.2.6 */
1452 png_byte compression_type;
1454 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1455 png_uint_32 user_width_max;
1456 png_uint_32 user_height_max;
1457 #endif
1459 /* New member added in libpng-1.0.25 and 1.2.17 */
1460 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1461 /* storage for unknown chunk that the library doesn't recognize. */
1462 png_unknown_chunk unknown_chunk;
1463 #endif
1465 /* New members added in libpng-1.2.26 */
1466 png_uint_32 old_big_row_buf_size, old_prev_row_size;
1468 /* New member added in libpng-1.2.30 */
1469 png_charp chunkdata; /* buffer for reading chunk data */
1471 };
1474 /* This triggers a compiler error in png.c, if png.c and png.h
1475 * do not agree upon the version number.
1476 */
1477 typedef png_structp version_1_2_33;
1479 typedef png_struct FAR * FAR * png_structpp;
1481 /* Here are the function definitions most commonly used. This is not
1482 * the place to find out how to use libpng. See libpng.txt for the
1483 * full explanation, see example.c for the summary. This just provides
1484 * a simple one line description of the use of each function.
1485 */
1487 /* Returns the version number of the library */
1488 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1490 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1491 * Handling more than 8 bytes from the beginning of the file is an error.
1492 */
1493 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1494 int num_bytes));
1496 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1497 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1498 * signature, and non-zero otherwise. Having num_to_check == 0 or
1499 * start > 7 will always fail (ie return non-zero).
1500 */
1501 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1502 png_size_t num_to_check));
1504 /* Simple signature checking function. This is the same as calling
1505 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1506 */
1507 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1509 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1510 extern PNG_EXPORT(png_structp,png_create_read_struct)
1511 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1512 png_error_ptr error_fn, png_error_ptr warn_fn));
1514 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1515 extern PNG_EXPORT(png_structp,png_create_write_struct)
1516 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1517 png_error_ptr error_fn, png_error_ptr warn_fn));
1519 #ifdef PNG_WRITE_SUPPORTED
1520 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1521 PNGARG((png_structp png_ptr));
1522 #endif
1524 #ifdef PNG_WRITE_SUPPORTED
1525 extern PNG_EXPORT(void,png_set_compression_buffer_size)
1526 PNGARG((png_structp png_ptr, png_uint_32 size));
1527 #endif
1529 /* Reset the compression stream */
1530 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1532 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1533 #ifdef PNG_USER_MEM_SUPPORTED
1534 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1535 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1536 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1537 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1538 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1539 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1540 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1541 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1542 #endif
1544 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1545 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1546 png_bytep chunk_name, png_bytep data, png_size_t length));
1548 /* Write the start of a PNG chunk - length and chunk name. */
1549 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1550 png_bytep chunk_name, png_uint_32 length));
1552 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1553 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1554 png_bytep data, png_size_t length));
1556 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1557 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1559 /* Allocate and initialize the info structure */
1560 extern PNG_EXPORT(png_infop,png_create_info_struct)
1561 PNGARG((png_structp png_ptr));
1563 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1564 /* Initialize the info structure (old interface - DEPRECATED) */
1565 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1566 #undef png_info_init
1567 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1568 png_sizeof(png_info));
1569 #endif
1571 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1572 png_size_t png_info_struct_size));
1574 /* Writes all the PNG information before the image. */
1575 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1576 png_infop info_ptr));
1577 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1578 png_infop info_ptr));
1580 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1581 /* read the information before the actual image data. */
1582 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1583 png_infop info_ptr));
1584 #endif
1586 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1587 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1588 PNGARG((png_structp png_ptr, png_timep ptime));
1589 #endif
1591 #if !defined(_WIN32_WCE)
1592 /* "time.h" functions are not supported on WindowsCE */
1593 #if defined(PNG_WRITE_tIME_SUPPORTED)
1594 /* convert from a struct tm to png_time */
1595 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1596 struct tm FAR * ttime));
1598 /* convert from time_t to png_time. Uses gmtime() */
1599 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1600 time_t ttime));
1601 #endif /* PNG_WRITE_tIME_SUPPORTED */
1602 #endif /* _WIN32_WCE */
1604 #if defined(PNG_READ_EXPAND_SUPPORTED)
1605 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1606 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1607 #if !defined(PNG_1_0_X)
1608 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1609 png_ptr));
1610 #endif
1611 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1612 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1613 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1614 /* Deprecated */
1615 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1616 #endif
1617 #endif
1619 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1620 /* Use blue, green, red order for pixels. */
1621 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1622 #endif
1624 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1625 /* Expand the grayscale to 24-bit RGB if necessary. */
1626 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1627 #endif
1629 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1630 /* Reduce RGB to grayscale. */
1631 #ifdef PNG_FLOATING_POINT_SUPPORTED
1632 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1633 int error_action, double red, double green ));
1634 #endif
1635 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1636 int error_action, png_fixed_point red, png_fixed_point green ));
1637 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1638 png_ptr));
1639 #endif
1641 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1642 png_colorp palette));
1644 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1645 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1646 #endif
1648 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1649 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1650 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1651 #endif
1653 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1654 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1655 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1656 #endif
1658 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1659 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1660 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1661 png_uint_32 filler, int flags));
1662 /* The values of the PNG_FILLER_ defines should NOT be changed */
1663 #define PNG_FILLER_BEFORE 0
1664 #define PNG_FILLER_AFTER 1
1665 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1666 #if !defined(PNG_1_0_X)
1667 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1668 png_uint_32 filler, int flags));
1669 #endif
1670 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1672 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1673 /* Swap bytes in 16-bit depth files. */
1674 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1675 #endif
1677 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1678 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1679 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1680 #endif
1682 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1683 /* Swap packing order of pixels in bytes. */
1684 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1685 #endif
1687 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1688 /* Converts files to legal bit depths. */
1689 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1690 png_color_8p true_bits));
1691 #endif
1693 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1694 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1695 /* Have the code handle the interlacing. Returns the number of passes. */
1696 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1697 #endif
1699 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1700 /* Invert monochrome files */
1701 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1702 #endif
1704 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1705 /* Handle alpha and tRNS by replacing with a background color. */
1706 #ifdef PNG_FLOATING_POINT_SUPPORTED
1707 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1708 png_color_16p background_color, int background_gamma_code,
1709 int need_expand, double background_gamma));
1710 #endif
1711 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1712 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1713 #define PNG_BACKGROUND_GAMMA_FILE 2
1714 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1715 #endif
1717 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1718 /* strip the second byte of information from a 16-bit depth file. */
1719 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1720 #endif
1722 #if defined(PNG_READ_DITHER_SUPPORTED)
1723 /* Turn on dithering, and reduce the palette to the number of colors available. */
1724 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1725 png_colorp palette, int num_palette, int maximum_colors,
1726 png_uint_16p histogram, int full_dither));
1727 #endif
1729 #if defined(PNG_READ_GAMMA_SUPPORTED)
1730 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1731 #ifdef PNG_FLOATING_POINT_SUPPORTED
1732 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1733 double screen_gamma, double default_file_gamma));
1734 #endif
1735 #endif
1737 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1738 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1739 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1740 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1741 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1742 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1743 int empty_plte_permitted));
1744 #endif
1745 #endif
1747 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1748 /* Set how many lines between output flushes - 0 for no flushing */
1749 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1750 /* Flush the current PNG output buffer */
1751 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1752 #endif
1754 /* optional update palette with requested transformations */
1755 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1757 /* optional call to update the users info structure */
1758 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1759 png_infop info_ptr));
1761 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1762 /* read one or more rows of image data. */
1763 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1764 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1765 #endif
1767 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1768 /* read a row of data. */
1769 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1770 png_bytep row,
1771 png_bytep display_row));
1772 #endif
1774 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1775 /* read the whole image into memory at once. */
1776 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1777 png_bytepp image));
1778 #endif
1780 /* write a row of image data */
1781 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1782 png_bytep row));
1784 /* write a few rows of image data */
1785 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1786 png_bytepp row, png_uint_32 num_rows));
1788 /* write the image data */
1789 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1790 png_bytepp image));
1792 /* writes the end of the PNG file. */
1793 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1794 png_infop info_ptr));
1796 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1797 /* read the end of the PNG file. */
1798 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1799 png_infop info_ptr));
1800 #endif
1802 /* free any memory associated with the png_info_struct */
1803 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1804 png_infopp info_ptr_ptr));
1806 /* free any memory associated with the png_struct and the png_info_structs */
1807 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1808 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1810 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1811 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1812 png_infop end_info_ptr));
1814 /* free any memory associated with the png_struct and the png_info_structs */
1815 extern PNG_EXPORT(void,png_destroy_write_struct)
1816 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1818 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1819 extern void png_write_destroy PNGARG((png_structp png_ptr));
1821 /* set the libpng method of handling chunk CRC errors */
1822 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1823 int crit_action, int ancil_action));
1825 /* Values for png_set_crc_action() to say how to handle CRC errors in
1826 * ancillary and critical chunks, and whether to use the data contained
1827 * therein. Note that it is impossible to "discard" data in a critical
1828 * chunk. For versions prior to 0.90, the action was always error/quit,
1829 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1830 * chunks is warn/discard. These values should NOT be changed.
1831 *
1832 * value action:critical action:ancillary
1833 */
1834 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1835 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1836 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1837 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1838 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1839 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1841 /* These functions give the user control over the scan-line filtering in
1842 * libpng and the compression methods used by zlib. These functions are
1843 * mainly useful for testing, as the defaults should work with most users.
1844 * Those users who are tight on memory or want faster performance at the
1845 * expense of compression can modify them. See the compression library
1846 * header file (zlib.h) for an explination of the compression functions.
1847 */
1849 /* set the filtering method(s) used by libpng. Currently, the only valid
1850 * value for "method" is 0.
1851 */
1852 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1853 int filters));
1855 /* Flags for png_set_filter() to say which filters to use. The flags
1856 * are chosen so that they don't conflict with real filter types
1857 * below, in case they are supplied instead of the #defined constants.
1858 * These values should NOT be changed.
1859 */
1860 #define PNG_NO_FILTERS 0x00
1861 #define PNG_FILTER_NONE 0x08
1862 #define PNG_FILTER_SUB 0x10
1863 #define PNG_FILTER_UP 0x20
1864 #define PNG_FILTER_AVG 0x40
1865 #define PNG_FILTER_PAETH 0x80
1866 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1867 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1869 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1870 * These defines should NOT be changed.
1871 */
1872 #define PNG_FILTER_VALUE_NONE 0
1873 #define PNG_FILTER_VALUE_SUB 1
1874 #define PNG_FILTER_VALUE_UP 2
1875 #define PNG_FILTER_VALUE_AVG 3
1876 #define PNG_FILTER_VALUE_PAETH 4
1877 #define PNG_FILTER_VALUE_LAST 5
1879 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1880 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1881 * defines, either the default (minimum-sum-of-absolute-differences), or
1882 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1883 *
1884 * Weights are factors >= 1.0, indicating how important it is to keep the
1885 * filter type consistent between rows. Larger numbers mean the current
1886 * filter is that many times as likely to be the same as the "num_weights"
1887 * previous filters. This is cumulative for each previous row with a weight.
1888 * There needs to be "num_weights" values in "filter_weights", or it can be
1889 * NULL if the weights aren't being specified. Weights have no influence on
1890 * the selection of the first row filter. Well chosen weights can (in theory)
1891 * improve the compression for a given image.
1892 *
1893 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1894 * filter type. Higher costs indicate more decoding expense, and are
1895 * therefore less likely to be selected over a filter with lower computational
1896 * costs. There needs to be a value in "filter_costs" for each valid filter
1897 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1898 * setting the costs. Costs try to improve the speed of decompression without
1899 * unduly increasing the compressed image size.
1900 *
1901 * A negative weight or cost indicates the default value is to be used, and
1902 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1903 * The default values for both weights and costs are currently 1.0, but may
1904 * change if good general weighting/cost heuristics can be found. If both
1905 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1906 * to the UNWEIGHTED method, but with added encoding time/computation.
1907 */
1908 #ifdef PNG_FLOATING_POINT_SUPPORTED
1909 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1910 int heuristic_method, int num_weights, png_doublep filter_weights,
1911 png_doublep filter_costs));
1912 #endif
1913 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1915 /* Heuristic used for row filter selection. These defines should NOT be
1916 * changed.
1917 */
1918 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1919 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1920 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1921 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1923 /* Set the library compression level. Currently, valid values range from
1924 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1925 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1926 * shown that zlib compression levels 3-6 usually perform as well as level 9
1927 * for PNG images, and do considerably fewer caclulations. In the future,
1928 * these values may not correspond directly to the zlib compression levels.
1929 */
1930 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1931 int level));
1933 extern PNG_EXPORT(void,png_set_compression_mem_level)
1934 PNGARG((png_structp png_ptr, int mem_level));
1936 extern PNG_EXPORT(void,png_set_compression_strategy)
1937 PNGARG((png_structp png_ptr, int strategy));
1939 extern PNG_EXPORT(void,png_set_compression_window_bits)
1940 PNGARG((png_structp png_ptr, int window_bits));
1942 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1943 int method));
1945 /* These next functions are called for input/output, memory, and error
1946 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1947 * and call standard C I/O routines such as fread(), fwrite(), and
1948 * fprintf(). These functions can be made to use other I/O routines
1949 * at run time for those applications that need to handle I/O in a
1950 * different manner by calling png_set_???_fn(). See libpng.txt for
1951 * more information.
1952 */
1954 #if !defined(PNG_NO_STDIO)
1955 /* Initialize the input/output for the PNG file to the default functions. */
1956 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1957 #endif
1959 /* Replace the (error and abort), and warning functions with user
1960 * supplied functions. If no messages are to be printed you must still
1961 * write and use replacement functions. The replacement error_fn should
1962 * still do a longjmp to the last setjmp location if you are using this
1963 * method of error handling. If error_fn or warning_fn is NULL, the
1964 * default function will be used.
1965 */
1967 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1968 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1970 /* Return the user pointer associated with the error functions */
1971 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1973 /* Replace the default data output functions with a user supplied one(s).
1974 * If buffered output is not used, then output_flush_fn can be set to NULL.
1975 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1976 * output_flush_fn will be ignored (and thus can be NULL).
1977 */
1978 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1979 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1981 /* Replace the default data input function with a user supplied one. */
1982 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1983 png_voidp io_ptr, png_rw_ptr read_data_fn));
1985 /* Return the user pointer associated with the I/O functions */
1986 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1988 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1989 png_read_status_ptr read_row_fn));
1991 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1992 png_write_status_ptr write_row_fn));
1994 #ifdef PNG_USER_MEM_SUPPORTED
1995 /* Replace the default memory allocation functions with user supplied one(s). */
1996 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1997 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1998 /* Return the user pointer associated with the memory functions */
1999 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
2000 #endif
2002 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2003 defined(PNG_LEGACY_SUPPORTED)
2004 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
2005 png_ptr, png_user_transform_ptr read_user_transform_fn));
2006 #endif
2008 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2009 defined(PNG_LEGACY_SUPPORTED)
2010 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
2011 png_ptr, png_user_transform_ptr write_user_transform_fn));
2012 #endif
2014 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2015 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2016 defined(PNG_LEGACY_SUPPORTED)
2017 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
2018 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
2019 int user_transform_channels));
2020 /* Return the user pointer associated with the user transform functions */
2021 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
2022 PNGARG((png_structp png_ptr));
2023 #endif
2025 #ifdef PNG_USER_CHUNKS_SUPPORTED
2026 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2027 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2028 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2029 png_ptr));
2030 #endif
2032 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2033 /* Sets the function callbacks for the push reader, and a pointer to a
2034 * user-defined structure available to the callback functions.
2035 */
2036 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2037 png_voidp progressive_ptr,
2038 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2039 png_progressive_end_ptr end_fn));
2041 /* returns the user pointer associated with the push read functions */
2042 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2043 PNGARG((png_structp png_ptr));
2045 /* function to be called when data becomes available */
2046 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2047 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2049 /* function that combines rows. Not very much different than the
2050 * png_combine_row() call. Is this even used?????
2051 */
2052 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2053 png_bytep old_row, png_bytep new_row));
2054 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2056 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2057 png_uint_32 size));
2059 #if defined(PNG_1_0_X)
2060 # define png_malloc_warn png_malloc
2061 #else
2062 /* Added at libpng version 1.2.4 */
2063 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2064 png_uint_32 size));
2065 #endif
2067 /* frees a pointer allocated by png_malloc() */
2068 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2070 #if defined(PNG_1_0_X)
2071 /* Function to allocate memory for zlib. */
2072 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2073 uInt size));
2075 /* Function to free memory for zlib */
2076 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2077 #endif
2079 /* Free data that was allocated internally */
2080 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2081 png_infop info_ptr, png_uint_32 free_me, int num));
2082 #ifdef PNG_FREE_ME_SUPPORTED
2083 /* Reassign responsibility for freeing existing data, whether allocated
2084 * by libpng or by the application */
2085 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2086 png_infop info_ptr, int freer, png_uint_32 mask));
2087 #endif
2088 /* assignments for png_data_freer */
2089 #define PNG_DESTROY_WILL_FREE_DATA 1
2090 #define PNG_SET_WILL_FREE_DATA 1
2091 #define PNG_USER_WILL_FREE_DATA 2
2092 /* Flags for png_ptr->free_me and info_ptr->free_me */
2093 #define PNG_FREE_HIST 0x0008
2094 #define PNG_FREE_ICCP 0x0010
2095 #define PNG_FREE_SPLT 0x0020
2096 #define PNG_FREE_ROWS 0x0040
2097 #define PNG_FREE_PCAL 0x0080
2098 #define PNG_FREE_SCAL 0x0100
2099 #define PNG_FREE_UNKN 0x0200
2100 #define PNG_FREE_LIST 0x0400
2101 #define PNG_FREE_PLTE 0x1000
2102 #define PNG_FREE_TRNS 0x2000
2103 #define PNG_FREE_TEXT 0x4000
2104 #define PNG_FREE_ALL 0x7fff
2105 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2107 #ifdef PNG_USER_MEM_SUPPORTED
2108 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2109 png_uint_32 size));
2110 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2111 png_voidp ptr));
2112 #endif
2114 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2115 png_voidp s1, png_voidp s2, png_uint_32 size));
2117 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2118 png_voidp s1, int value, png_uint_32 size));
2120 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2121 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2122 int check));
2123 #endif /* USE_FAR_KEYWORD */
2125 #ifndef PNG_NO_ERROR_TEXT
2126 /* Fatal error in PNG image of libpng - can't continue */
2127 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2128 png_const_charp error_message));
2130 /* The same, but the chunk name is prepended to the error string. */
2131 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2132 png_const_charp error_message));
2133 #else
2134 /* Fatal error in PNG image of libpng - can't continue */
2135 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
2136 #endif
2138 #ifndef PNG_NO_WARNINGS
2139 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2140 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2141 png_const_charp warning_message));
2143 #ifdef PNG_READ_SUPPORTED
2144 /* Non-fatal error in libpng, chunk name is prepended to message. */
2145 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2146 png_const_charp warning_message));
2147 #endif /* PNG_READ_SUPPORTED */
2148 #endif /* PNG_NO_WARNINGS */
2150 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2151 * Similarly, the png_get_<chunk> calls are used to read values from the
2152 * png_info_struct, either storing the parameters in the passed variables, or
2153 * setting pointers into the png_info_struct where the data is stored. The
2154 * png_get_<chunk> functions return a non-zero value if the data was available
2155 * in info_ptr, or return zero and do not change any of the parameters if the
2156 * data was not available.
2157 *
2158 * These functions should be used instead of directly accessing png_info
2159 * to avoid problems with future changes in the size and internal layout of
2160 * png_info_struct.
2161 */
2162 /* Returns "flag" if chunk data is valid in info_ptr. */
2163 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2164 png_infop info_ptr, png_uint_32 flag));
2166 /* Returns number of bytes needed to hold a transformed row. */
2167 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2168 png_infop info_ptr));
2170 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2171 /* Returns row_pointers, which is an array of pointers to scanlines that was
2172 returned from png_read_png(). */
2173 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2174 png_infop info_ptr));
2175 /* Set row_pointers, which is an array of pointers to scanlines for use
2176 by png_write_png(). */
2177 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2178 png_infop info_ptr, png_bytepp row_pointers));
2179 #endif
2181 /* Returns number of color channels in image. */
2182 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2183 png_infop info_ptr));
2185 #ifdef PNG_EASY_ACCESS_SUPPORTED
2186 /* Returns image width in pixels. */
2187 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2188 png_ptr, png_infop info_ptr));
2190 /* Returns image height in pixels. */
2191 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2192 png_ptr, png_infop info_ptr));
2194 /* Returns image bit_depth. */
2195 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2196 png_ptr, png_infop info_ptr));
2198 /* Returns image color_type. */
2199 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2200 png_ptr, png_infop info_ptr));
2202 /* Returns image filter_type. */
2203 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2204 png_ptr, png_infop info_ptr));
2206 /* Returns image interlace_type. */
2207 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2208 png_ptr, png_infop info_ptr));
2210 /* Returns image compression_type. */
2211 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2212 png_ptr, png_infop info_ptr));
2214 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2215 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2216 png_ptr, png_infop info_ptr));
2217 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2218 png_ptr, png_infop info_ptr));
2219 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2220 png_ptr, png_infop info_ptr));
2222 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2223 #ifdef PNG_FLOATING_POINT_SUPPORTED
2224 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2225 png_ptr, png_infop info_ptr));
2226 #endif
2228 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2229 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2230 png_ptr, png_infop info_ptr));
2231 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2232 png_ptr, png_infop info_ptr));
2233 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2234 png_ptr, png_infop info_ptr));
2235 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2236 png_ptr, png_infop info_ptr));
2238 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2240 /* Returns pointer to signature string read from PNG header */
2241 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2242 png_infop info_ptr));
2244 #if defined(PNG_bKGD_SUPPORTED)
2245 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2246 png_infop info_ptr, png_color_16p *background));
2247 #endif
2249 #if defined(PNG_bKGD_SUPPORTED)
2250 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2251 png_infop info_ptr, png_color_16p background));
2252 #endif
2254 #if defined(PNG_cHRM_SUPPORTED)
2255 #ifdef PNG_FLOATING_POINT_SUPPORTED
2256 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2257 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2258 double *red_y, double *green_x, double *green_y, double *blue_x,
2259 double *blue_y));
2260 #endif
2261 #ifdef PNG_FIXED_POINT_SUPPORTED
2262 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2263 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2264 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2265 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2266 *int_blue_x, png_fixed_point *int_blue_y));
2267 #endif
2268 #endif
2270 #if defined(PNG_cHRM_SUPPORTED)
2271 #ifdef PNG_FLOATING_POINT_SUPPORTED
2272 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2273 png_infop info_ptr, double white_x, double white_y, double red_x,
2274 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2275 #endif
2276 #ifdef PNG_FIXED_POINT_SUPPORTED
2277 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2278 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2279 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2280 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2281 png_fixed_point int_blue_y));
2282 #endif
2283 #endif
2285 #if defined(PNG_gAMA_SUPPORTED)
2286 #ifdef PNG_FLOATING_POINT_SUPPORTED
2287 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2288 png_infop info_ptr, double *file_gamma));
2289 #endif
2290 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2291 png_infop info_ptr, png_fixed_point *int_file_gamma));
2292 #endif
2294 #if defined(PNG_gAMA_SUPPORTED)
2295 #ifdef PNG_FLOATING_POINT_SUPPORTED
2296 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2297 png_infop info_ptr, double file_gamma));
2298 #endif
2299 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2300 png_infop info_ptr, png_fixed_point int_file_gamma));
2301 #endif
2303 #if defined(PNG_hIST_SUPPORTED)
2304 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2305 png_infop info_ptr, png_uint_16p *hist));
2306 #endif
2308 #if defined(PNG_hIST_SUPPORTED)
2309 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2310 png_infop info_ptr, png_uint_16p hist));
2311 #endif
2313 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2314 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2315 int *bit_depth, int *color_type, int *interlace_method,
2316 int *compression_method, int *filter_method));
2318 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2319 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2320 int color_type, int interlace_method, int compression_method,
2321 int filter_method));
2323 #if defined(PNG_oFFs_SUPPORTED)
2324 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2325 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2326 int *unit_type));
2327 #endif
2329 #if defined(PNG_oFFs_SUPPORTED)
2330 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2331 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2332 int unit_type));
2333 #endif
2335 #if defined(PNG_pCAL_SUPPORTED)
2336 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2337 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2338 int *type, int *nparams, png_charp *units, png_charpp *params));
2339 #endif
2341 #if defined(PNG_pCAL_SUPPORTED)
2342 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2343 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2344 int type, int nparams, png_charp units, png_charpp params));
2345 #endif
2347 #if defined(PNG_pHYs_SUPPORTED)
2348 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2349 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2350 #endif
2352 #if defined(PNG_pHYs_SUPPORTED)
2353 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2354 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2355 #endif
2357 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2358 png_infop info_ptr, png_colorp *palette, int *num_palette));
2360 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2361 png_infop info_ptr, png_colorp palette, int num_palette));
2363 #if defined(PNG_sBIT_SUPPORTED)
2364 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2365 png_infop info_ptr, png_color_8p *sig_bit));
2366 #endif
2368 #if defined(PNG_sBIT_SUPPORTED)
2369 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2370 png_infop info_ptr, png_color_8p sig_bit));
2371 #endif
2373 #if defined(PNG_sRGB_SUPPORTED)
2374 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2375 png_infop info_ptr, int *intent));
2376 #endif
2378 #if defined(PNG_sRGB_SUPPORTED)
2379 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2380 png_infop info_ptr, int intent));
2381 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2382 png_infop info_ptr, int intent));
2383 #endif
2385 #if defined(PNG_iCCP_SUPPORTED)
2386 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2387 png_infop info_ptr, png_charpp name, int *compression_type,
2388 png_charpp profile, png_uint_32 *proflen));
2389 /* Note to maintainer: profile should be png_bytepp */
2390 #endif
2392 #if defined(PNG_iCCP_SUPPORTED)
2393 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2394 png_infop info_ptr, png_charp name, int compression_type,
2395 png_charp profile, png_uint_32 proflen));
2396 /* Note to maintainer: profile should be png_bytep */
2397 #endif
2399 #if defined(PNG_sPLT_SUPPORTED)
2400 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2401 png_infop info_ptr, png_sPLT_tpp entries));
2402 #endif
2404 #if defined(PNG_sPLT_SUPPORTED)
2405 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2406 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2407 #endif
2409 #if defined(PNG_TEXT_SUPPORTED)
2410 /* png_get_text also returns the number of text chunks in *num_text */
2411 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2412 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2413 #endif
2415 /*
2416 * Note while png_set_text() will accept a structure whose text,
2417 * language, and translated keywords are NULL pointers, the structure
2418 * returned by png_get_text will always contain regular
2419 * zero-terminated C strings. They might be empty strings but
2420 * they will never be NULL pointers.
2421 */
2423 #if defined(PNG_TEXT_SUPPORTED)
2424 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2425 png_infop info_ptr, png_textp text_ptr, int num_text));
2426 #endif
2428 #if defined(PNG_tIME_SUPPORTED)
2429 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2430 png_infop info_ptr, png_timep *mod_time));
2431 #endif
2433 #if defined(PNG_tIME_SUPPORTED)
2434 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2435 png_infop info_ptr, png_timep mod_time));
2436 #endif
2438 #if defined(PNG_tRNS_SUPPORTED)
2439 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2440 png_infop info_ptr, png_bytep *trans, int *num_trans,
2441 png_color_16p *trans_values));
2442 #endif
2444 #if defined(PNG_tRNS_SUPPORTED)
2445 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2446 png_infop info_ptr, png_bytep trans, int num_trans,
2447 png_color_16p trans_values));
2448 #endif
2450 #if defined(PNG_tRNS_SUPPORTED)
2451 #endif
2453 #if defined(PNG_sCAL_SUPPORTED)
2454 #ifdef PNG_FLOATING_POINT_SUPPORTED
2455 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2456 png_infop info_ptr, int *unit, double *width, double *height));
2457 #else
2458 #ifdef PNG_FIXED_POINT_SUPPORTED
2459 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2460 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2461 #endif
2462 #endif
2463 #endif /* PNG_sCAL_SUPPORTED */
2465 #if defined(PNG_sCAL_SUPPORTED)
2466 #ifdef PNG_FLOATING_POINT_SUPPORTED
2467 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2468 png_infop info_ptr, int unit, double width, double height));
2469 #else
2470 #ifdef PNG_FIXED_POINT_SUPPORTED
2471 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2472 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2473 #endif
2474 #endif
2475 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2477 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2478 /* provide a list of chunks and how they are to be handled, if the built-in
2479 handling or default unknown chunk handling is not desired. Any chunks not
2480 listed will be handled in the default manner. The IHDR and IEND chunks
2481 must not be listed.
2482 keep = 0: follow default behaviour
2483 = 1: do not keep
2484 = 2: keep only if safe-to-copy
2485 = 3: keep even if unsafe-to-copy
2486 */
2487 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2488 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2489 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2490 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2491 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2492 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2493 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2494 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2495 #endif
2496 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2497 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2498 chunk_name));
2499 #endif
2501 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2502 If you need to turn it off for a chunk that your application has freed,
2503 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2504 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2505 png_infop info_ptr, int mask));
2507 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2508 /* The "params" pointer is currently not used and is for future expansion. */
2509 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2510 png_infop info_ptr,
2511 int transforms,
2512 png_voidp params));
2513 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2514 png_infop info_ptr,
2515 int transforms,
2516 png_voidp params));
2517 #endif
2519 /* Define PNG_DEBUG at compile time for debugging information. Higher
2520 * numbers for PNG_DEBUG mean more debugging information. This has
2521 * only been added since version 0.95 so it is not implemented throughout
2522 * libpng yet, but more support will be added as needed.
2523 */
2524 #ifdef PNG_DEBUG
2525 #if (PNG_DEBUG > 0)
2526 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2527 #include <crtdbg.h>
2528 #if (PNG_DEBUG > 1)
2529 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
2530 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2531 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2532 #endif
2533 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2534 #ifndef PNG_DEBUG_FILE
2535 #define PNG_DEBUG_FILE stderr
2536 #endif /* PNG_DEBUG_FILE */
2537 #if (PNG_DEBUG > 1)
2538 #define png_debug(l,m) \
2539 { \
2540 int num_tabs=l; \
2541 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2542 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2543 }
2544 #define png_debug1(l,m,p1) \
2545 { \
2546 int num_tabs=l; \
2547 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2548 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2549 }
2550 #define png_debug2(l,m,p1,p2) \
2551 { \
2552 int num_tabs=l; \
2553 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2554 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2555 }
2556 #endif /* (PNG_DEBUG > 1) */
2557 #endif /* _MSC_VER */
2558 #endif /* (PNG_DEBUG > 0) */
2559 #endif /* PNG_DEBUG */
2560 #ifndef png_debug
2561 #define png_debug(l, m)
2562 #endif
2563 #ifndef png_debug1
2564 #define png_debug1(l, m, p1)
2565 #endif
2566 #ifndef png_debug2
2567 #define png_debug2(l, m, p1, p2)
2568 #endif
2570 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2571 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2572 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2573 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2575 #ifdef PNG_MNG_FEATURES_SUPPORTED
2576 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2577 png_ptr, png_uint_32 mng_features_permitted));
2578 #endif
2580 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2581 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2582 #define PNG_HANDLE_CHUNK_NEVER 1
2583 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2584 #define PNG_HANDLE_CHUNK_ALWAYS 3
2586 /* Added to version 1.2.0 */
2587 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2588 #if defined(PNG_MMX_CODE_SUPPORTED)
2589 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2590 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2591 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2592 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2593 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2594 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2595 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2596 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2597 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2599 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2600 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2601 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2602 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2603 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2604 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2605 #define PNG_MMX_WRITE_FLAGS ( 0 )
2607 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2608 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2609 | PNG_MMX_READ_FLAGS \
2610 | PNG_MMX_WRITE_FLAGS )
2612 #define PNG_SELECT_READ 1
2613 #define PNG_SELECT_WRITE 2
2614 #endif /* PNG_MMX_CODE_SUPPORTED */
2616 #if !defined(PNG_1_0_X)
2617 /* pngget.c */
2618 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2619 PNGARG((int flag_select, int *compilerID));
2621 /* pngget.c */
2622 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2623 PNGARG((int flag_select));
2625 /* pngget.c */
2626 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2627 PNGARG((png_structp png_ptr));
2629 /* pngget.c */
2630 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2631 PNGARG((png_structp png_ptr));
2633 /* pngget.c */
2634 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2635 PNGARG((png_structp png_ptr));
2637 /* pngset.c */
2638 extern PNG_EXPORT(void,png_set_asm_flags)
2639 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2641 /* pngset.c */
2642 extern PNG_EXPORT(void,png_set_mmx_thresholds)
2643 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2644 png_uint_32 mmx_rowbytes_threshold));
2646 #endif /* PNG_1_0_X */
2648 #if !defined(PNG_1_0_X)
2649 /* png.c, pnggccrd.c, or pngvcrd.c */
2650 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2651 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2653 /* Strip the prepended error numbers ("#nnn ") from error and warning
2654 * messages before passing them to the error or warning handler. */
2655 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2656 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2657 png_ptr, png_uint_32 strip_mode));
2658 #endif
2660 #endif /* PNG_1_0_X */
2662 /* Added at libpng-1.2.6 */
2663 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2664 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2665 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2666 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2667 png_ptr));
2668 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2669 png_ptr));
2670 #endif
2673 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2675 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2676 /* With these routines we avoid an integer divide, which will be slower on
2677 * most machines. However, it does take more operations than the corresponding
2678 * divide method, so it may be slower on a few RISC systems. There are two
2679 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2680 *
2681 * Note that the rounding factors are NOT supposed to be the same! 128 and
2682 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2683 * standard method.
2684 *
2685 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2686 */
2688 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2690 # define png_composite(composite, fg, alpha, bg) \
2691 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2692 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2693 (png_uint_16)(alpha)) + (png_uint_16)128); \
2694 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2696 # define png_composite_16(composite, fg, alpha, bg) \
2697 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2698 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2699 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2700 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2702 #else /* standard method using integer division */
2704 # define png_composite(composite, fg, alpha, bg) \
2705 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2706 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2707 (png_uint_16)127) / 255)
2709 # define png_composite_16(composite, fg, alpha, bg) \
2710 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2711 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2712 (png_uint_32)32767) / (png_uint_32)65535L)
2714 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2716 /* Inline macros to do direct reads of bytes from the input buffer. These
2717 * require that you are using an architecture that uses PNG byte ordering
2718 * (MSB first) and supports unaligned data storage. I think that PowerPC
2719 * in big-endian mode and 680x0 are the only ones that will support this.
2720 * The x86 line of processors definitely do not. The png_get_int_32()
2721 * routine also assumes we are using two's complement format for negative
2722 * values, which is almost certainly true.
2723 */
2724 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2725 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2726 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2727 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2728 #else
2729 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2730 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2731 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2732 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2733 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2734 PNGARG((png_structp png_ptr, png_bytep buf));
2735 /* No png_get_int_16 -- may be added if there's a real need for it. */
2737 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2738 */
2739 extern PNG_EXPORT(void,png_save_uint_32)
2740 PNGARG((png_bytep buf, png_uint_32 i));
2741 extern PNG_EXPORT(void,png_save_int_32)
2742 PNGARG((png_bytep buf, png_int_32 i));
2744 /* Place a 16-bit number into a buffer in PNG byte order.
2745 * The parameter is declared unsigned int, not png_uint_16,
2746 * just to avoid potential problems on pre-ANSI C compilers.
2747 */
2748 extern PNG_EXPORT(void,png_save_uint_16)
2749 PNGARG((png_bytep buf, unsigned int i));
2750 /* No png_save_int_16 -- may be added if there's a real need for it. */
2752 /* ************************************************************************* */
2754 /* These next functions are used internally in the code. They generally
2755 * shouldn't be used unless you are writing code to add or replace some
2756 * functionality in libpng. More information about most functions can
2757 * be found in the files where the functions are located.
2758 */
2761 /* Various modes of operation, that are visible to applications because
2762 * they are used for unknown chunk location.
2763 */
2764 #define PNG_HAVE_IHDR 0x01
2765 #define PNG_HAVE_PLTE 0x02
2766 #define PNG_HAVE_IDAT 0x04
2767 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2768 #define PNG_HAVE_IEND 0x10
2770 #if defined(PNG_INTERNAL)
2772 /* More modes of operation. Note that after an init, mode is set to
2773 * zero automatically when the structure is created.
2774 */
2775 #define PNG_HAVE_gAMA 0x20
2776 #define PNG_HAVE_cHRM 0x40
2777 #define PNG_HAVE_sRGB 0x80
2778 #define PNG_HAVE_CHUNK_HEADER 0x100
2779 #define PNG_WROTE_tIME 0x200
2780 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2781 #define PNG_BACKGROUND_IS_GRAY 0x800
2782 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2783 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2785 /* flags for the transformations the PNG library does on the image data */
2786 #define PNG_BGR 0x0001
2787 #define PNG_INTERLACE 0x0002
2788 #define PNG_PACK 0x0004
2789 #define PNG_SHIFT 0x0008
2790 #define PNG_SWAP_BYTES 0x0010
2791 #define PNG_INVERT_MONO 0x0020
2792 #define PNG_DITHER 0x0040
2793 #define PNG_BACKGROUND 0x0080
2794 #define PNG_BACKGROUND_EXPAND 0x0100
2795 /* 0x0200 unused */
2796 #define PNG_16_TO_8 0x0400
2797 #define PNG_RGBA 0x0800
2798 #define PNG_EXPAND 0x1000
2799 #define PNG_GAMMA 0x2000
2800 #define PNG_GRAY_TO_RGB 0x4000
2801 #define PNG_FILLER 0x8000L
2802 #define PNG_PACKSWAP 0x10000L
2803 #define PNG_SWAP_ALPHA 0x20000L
2804 #define PNG_STRIP_ALPHA 0x40000L
2805 #define PNG_INVERT_ALPHA 0x80000L
2806 #define PNG_USER_TRANSFORM 0x100000L
2807 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2808 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2809 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2810 /* 0x800000L Unused */
2811 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2812 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2813 /* 0x4000000L unused */
2814 /* 0x8000000L unused */
2815 /* 0x10000000L unused */
2816 /* 0x20000000L unused */
2817 /* 0x40000000L unused */
2819 /* flags for png_create_struct */
2820 #define PNG_STRUCT_PNG 0x0001
2821 #define PNG_STRUCT_INFO 0x0002
2823 /* Scaling factor for filter heuristic weighting calculations */
2824 #define PNG_WEIGHT_SHIFT 8
2825 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2826 #define PNG_COST_SHIFT 3
2827 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2829 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2830 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2831 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2832 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2833 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2834 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2835 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2836 #define PNG_FLAG_ROW_INIT 0x0040
2837 #define PNG_FLAG_FILLER_AFTER 0x0080
2838 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2839 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2840 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2841 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2842 #define PNG_FLAG_FREE_PLTE 0x1000
2843 #define PNG_FLAG_FREE_TRNS 0x2000
2844 #define PNG_FLAG_FREE_HIST 0x4000
2845 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2846 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2847 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2848 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2849 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2850 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2851 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2852 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2853 /* 0x800000L unused */
2854 /* 0x1000000L unused */
2855 /* 0x2000000L unused */
2856 /* 0x4000000L unused */
2857 /* 0x8000000L unused */
2858 /* 0x10000000L unused */
2859 /* 0x20000000L unused */
2860 /* 0x40000000L unused */
2862 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2863 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2865 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2866 PNG_FLAG_CRC_CRITICAL_IGNORE)
2868 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2869 PNG_FLAG_CRC_CRITICAL_MASK)
2871 /* save typing and make code easier to understand */
2873 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2874 abs((int)((c1).green) - (int)((c2).green)) + \
2875 abs((int)((c1).blue) - (int)((c2).blue)))
2877 /* Added to libpng-1.2.6 JB */
2878 #define PNG_ROWBYTES(pixel_bits, width) \
2879 ((pixel_bits) >= 8 ? \
2880 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2881 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2883 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2884 ideal-delta..ideal+delta. Each argument is evaluated twice.
2885 "ideal" and "delta" should be constants, normally simple
2886 integers, "value" a variable. Added to libpng-1.2.6 JB */
2887 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2888 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2890 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2891 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2892 /* place to hold the signature string for a PNG file. */
2893 #ifdef PNG_USE_GLOBAL_ARRAYS
2894 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
2895 #else
2896 #endif
2897 #endif /* PNG_NO_EXTERN */
2899 /* Constant strings for known chunk types. If you need to add a chunk,
2900 * define the name here, and add an invocation of the macro in png.c and
2901 * wherever it's needed.
2902 */
2903 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2904 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2905 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2906 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2907 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2908 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2909 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2910 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2911 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2912 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2913 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2914 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2915 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2916 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2917 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2918 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2919 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2920 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2921 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2922 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2923 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2925 #ifdef PNG_USE_GLOBAL_ARRAYS
2926 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
2927 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
2928 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
2929 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
2930 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
2931 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
2932 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
2933 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
2934 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
2935 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
2936 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
2937 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
2938 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
2939 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
2940 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
2941 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
2942 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
2943 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
2944 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
2945 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
2946 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
2947 #endif /* PNG_USE_GLOBAL_ARRAYS */
2949 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2950 /* Initialize png_ptr struct for reading, and allocate any other memory.
2951 * (old interface - DEPRECATED - use png_create_read_struct instead).
2952 */
2953 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
2954 #undef png_read_init
2955 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2956 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2957 #endif
2959 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2960 png_const_charp user_png_ver, png_size_t png_struct_size));
2961 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2962 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2963 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2964 png_info_size));
2965 #endif
2967 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2968 /* Initialize png_ptr struct for writing, and allocate any other memory.
2969 * (old interface - DEPRECATED - use png_create_write_struct instead).
2970 */
2971 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
2972 #undef png_write_init
2973 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2974 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2975 #endif
2977 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2978 png_const_charp user_png_ver, png_size_t png_struct_size));
2979 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2980 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2981 png_info_size));
2983 /* Allocate memory for an internal libpng struct */
2984 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
2986 /* Free memory from internal libpng struct */
2987 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
2989 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2990 malloc_fn, png_voidp mem_ptr));
2991 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2992 png_free_ptr free_fn, png_voidp mem_ptr));
2994 /* Free any memory that info_ptr points to and reset struct. */
2995 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2996 png_infop info_ptr));
2998 #ifndef PNG_1_0_X
2999 /* Function to allocate memory for zlib. */
3000 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
3002 /* Function to free memory for zlib */
3003 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
3005 #ifdef PNG_SIZE_T
3006 /* Function to convert a sizeof an item to png_sizeof item */
3007 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
3008 #endif
3010 /* Next four functions are used internally as callbacks. PNGAPI is required
3011 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
3013 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
3014 png_bytep data, png_size_t length));
3016 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3017 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
3018 png_bytep buffer, png_size_t length));
3019 #endif
3021 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
3022 png_bytep data, png_size_t length));
3024 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3025 #if !defined(PNG_NO_STDIO)
3026 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
3027 #endif
3028 #endif
3029 #else /* PNG_1_0_X */
3030 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3031 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
3032 png_bytep buffer, png_size_t length));
3033 #endif
3034 #endif /* PNG_1_0_X */
3036 /* Reset the CRC variable */
3037 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
3039 /* Write the "data" buffer to whatever output you are using. */
3040 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
3041 png_size_t length));
3043 /* Read data from whatever input you are using into the "data" buffer */
3044 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
3045 png_size_t length));
3047 /* Read bytes into buf, and update png_ptr->crc */
3048 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
3049 png_size_t length));
3051 /* Decompress data in a chunk that uses compression */
3052 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3053 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3054 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
3055 int comp_type, png_size_t chunklength,
3056 png_size_t prefix_length, png_size_t *data_length));
3057 #endif
3059 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3060 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
3062 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3063 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
3065 /* Calculate the CRC over a section of data. Note that we are only
3066 * passing a maximum of 64K on systems that have this as a memory limit,
3067 * since this is the maximum buffer size we can specify.
3068 */
3069 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3070 png_size_t length));
3072 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3073 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
3074 #endif
3076 /* simple function to write the signature */
3077 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
3079 /* write various chunks */
3081 /* Write the IHDR chunk, and update the png_struct with the necessary
3082 * information.
3083 */
3084 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3085 png_uint_32 height,
3086 int bit_depth, int color_type, int compression_method, int filter_method,
3087 int interlace_method));
3089 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3090 png_uint_32 num_pal));
3092 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3093 png_size_t length));
3095 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
3097 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3098 #ifdef PNG_FLOATING_POINT_SUPPORTED
3099 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
3100 #endif
3101 #ifdef PNG_FIXED_POINT_SUPPORTED
3102 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
3103 file_gamma));
3104 #endif
3105 #endif
3107 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3108 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3109 int color_type));
3110 #endif
3112 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3113 #ifdef PNG_FLOATING_POINT_SUPPORTED
3114 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3115 double white_x, double white_y,
3116 double red_x, double red_y, double green_x, double green_y,
3117 double blue_x, double blue_y));
3118 #endif
3119 #ifdef PNG_FIXED_POINT_SUPPORTED
3120 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3121 png_fixed_point int_white_x, png_fixed_point int_white_y,
3122 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3123 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3124 png_fixed_point int_blue_y));
3125 #endif
3126 #endif
3128 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3129 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3130 int intent));
3131 #endif
3133 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3134 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3135 png_charp name, int compression_type,
3136 png_charp profile, int proflen));
3137 /* Note to maintainer: profile should be png_bytep */
3138 #endif
3140 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3141 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3142 png_sPLT_tp palette));
3143 #endif
3145 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3146 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3147 png_color_16p values, int number, int color_type));
3148 #endif
3150 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3151 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3152 png_color_16p values, int color_type));
3153 #endif
3155 #if defined(PNG_WRITE_hIST_SUPPORTED)
3156 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3157 int num_hist));
3158 #endif
3160 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3161 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3162 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3163 png_charp key, png_charpp new_key));
3164 #endif
3166 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3167 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3168 png_charp text, png_size_t text_len));
3169 #endif
3171 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3172 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3173 png_charp text, png_size_t text_len, int compression));
3174 #endif
3176 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3177 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3178 int compression, png_charp key, png_charp lang, png_charp lang_key,
3179 png_charp text));
3180 #endif
3182 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3183 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3184 png_infop info_ptr, png_textp text_ptr, int num_text));
3185 #endif
3187 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3188 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3189 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3190 #endif
3192 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3193 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3194 png_int_32 X0, png_int_32 X1, int type, int nparams,
3195 png_charp units, png_charpp params));
3196 #endif
3198 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3199 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3200 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3201 int unit_type));
3202 #endif
3204 #if defined(PNG_WRITE_tIME_SUPPORTED)
3205 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3206 png_timep mod_time));
3207 #endif
3209 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3210 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3211 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3212 int unit, double width, double height));
3213 #else
3214 #ifdef PNG_FIXED_POINT_SUPPORTED
3215 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3216 int unit, png_charp width, png_charp height));
3217 #endif
3218 #endif
3219 #endif
3221 /* Called when finished processing a row of data */
3222 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3224 /* Internal use only. Called before first row of data */
3225 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3227 #if defined(PNG_READ_GAMMA_SUPPORTED)
3228 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3229 #endif
3231 /* combine a row of data, dealing with alpha, etc. if requested */
3232 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3233 int mask));
3235 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3236 /* expand an interlaced row */
3237 /* OLD pre-1.0.9 interface:
3238 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3239 png_bytep row, int pass, png_uint_32 transformations));
3240 */
3241 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3242 #endif
3244 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3246 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3247 /* grab pixels out of a row for an interlaced pass */
3248 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3249 png_bytep row, int pass));
3250 #endif
3252 /* unfilter a row */
3253 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3254 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3256 /* Choose the best filter to use and filter the row data */
3257 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3258 png_row_infop row_info));
3260 /* Write out the filtered row. */
3261 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3262 png_bytep filtered_row));
3263 /* finish a row while reading, dealing with interlacing passes, etc. */
3264 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3266 /* initialize the row buffers, etc. */
3267 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3268 /* optional call to update the users info structure */
3269 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3270 png_infop info_ptr));
3272 /* these are the functions that do the transformations */
3273 #if defined(PNG_READ_FILLER_SUPPORTED)
3274 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3275 png_bytep row, png_uint_32 filler, png_uint_32 flags));
3276 #endif
3278 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3279 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3280 png_bytep row));
3281 #endif
3283 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3284 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3285 png_bytep row));
3286 #endif
3288 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3289 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3290 png_bytep row));
3291 #endif
3293 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3294 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3295 png_bytep row));
3296 #endif
3298 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3299 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3300 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3301 png_bytep row, png_uint_32 flags));
3302 #endif
3304 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3305 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3306 #endif
3308 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3309 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3310 #endif
3312 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3313 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3314 row_info, png_bytep row));
3315 #endif
3317 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3318 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3319 png_bytep row));
3320 #endif
3322 #if defined(PNG_READ_PACK_SUPPORTED)
3323 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3324 #endif
3326 #if defined(PNG_READ_SHIFT_SUPPORTED)
3327 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3328 png_color_8p sig_bits));
3329 #endif
3331 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3332 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3333 #endif
3335 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3336 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3337 #endif
3339 #if defined(PNG_READ_DITHER_SUPPORTED)
3340 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3341 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3343 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3344 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3345 png_colorp palette, int num_palette));
3346 # endif
3347 #endif
3349 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3350 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3351 #endif
3353 #if defined(PNG_WRITE_PACK_SUPPORTED)
3354 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3355 png_bytep row, png_uint_32 bit_depth));
3356 #endif
3358 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3359 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3360 png_color_8p bit_depth));
3361 #endif
3363 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3364 #if defined(PNG_READ_GAMMA_SUPPORTED)
3365 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3366 png_color_16p trans_values, png_color_16p background,
3367 png_color_16p background_1,
3368 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3369 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3370 png_uint_16pp gamma_16_to_1, int gamma_shift));
3371 #else
3372 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3373 png_color_16p trans_values, png_color_16p background));
3374 #endif
3375 #endif
3377 #if defined(PNG_READ_GAMMA_SUPPORTED)
3378 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3379 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3380 int gamma_shift));
3381 #endif
3383 #if defined(PNG_READ_EXPAND_SUPPORTED)
3384 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3385 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3386 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3387 png_bytep row, png_color_16p trans_value));
3388 #endif
3390 /* The following decodes the appropriate chunks, and does error correction,
3391 * then calls the appropriate callback for the chunk if it is valid.
3392 */
3394 /* decode the IHDR chunk */
3395 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3396 png_uint_32 length));
3397 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3398 png_uint_32 length));
3399 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3400 png_uint_32 length));
3402 #if defined(PNG_READ_bKGD_SUPPORTED)
3403 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3404 png_uint_32 length));
3405 #endif
3407 #if defined(PNG_READ_cHRM_SUPPORTED)
3408 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3409 png_uint_32 length));
3410 #endif
3412 #if defined(PNG_READ_gAMA_SUPPORTED)
3413 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3414 png_uint_32 length));
3415 #endif
3417 #if defined(PNG_READ_hIST_SUPPORTED)
3418 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3419 png_uint_32 length));
3420 #endif
3422 #if defined(PNG_READ_iCCP_SUPPORTED)
3423 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3424 png_uint_32 length));
3425 #endif /* PNG_READ_iCCP_SUPPORTED */
3427 #if defined(PNG_READ_iTXt_SUPPORTED)
3428 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3429 png_uint_32 length));
3430 #endif
3432 #if defined(PNG_READ_oFFs_SUPPORTED)
3433 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3434 png_uint_32 length));
3435 #endif
3437 #if defined(PNG_READ_pCAL_SUPPORTED)
3438 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3439 png_uint_32 length));
3440 #endif
3442 #if defined(PNG_READ_pHYs_SUPPORTED)
3443 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3444 png_uint_32 length));
3445 #endif
3447 #if defined(PNG_READ_sBIT_SUPPORTED)
3448 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3449 png_uint_32 length));
3450 #endif
3452 #if defined(PNG_READ_sCAL_SUPPORTED)
3453 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3454 png_uint_32 length));
3455 #endif
3457 #if defined(PNG_READ_sPLT_SUPPORTED)
3458 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3459 png_uint_32 length));
3460 #endif /* PNG_READ_sPLT_SUPPORTED */
3462 #if defined(PNG_READ_sRGB_SUPPORTED)
3463 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3464 png_uint_32 length));
3465 #endif
3467 #if defined(PNG_READ_tEXt_SUPPORTED)
3468 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3469 png_uint_32 length));
3470 #endif
3472 #if defined(PNG_READ_tIME_SUPPORTED)
3473 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3474 png_uint_32 length));
3475 #endif
3477 #if defined(PNG_READ_tRNS_SUPPORTED)
3478 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3479 png_uint_32 length));
3480 #endif
3482 #if defined(PNG_READ_zTXt_SUPPORTED)
3483 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3484 png_uint_32 length));
3485 #endif
3487 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3488 png_infop info_ptr, png_uint_32 length));
3490 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3491 png_bytep chunk_name));
3493 /* handle the transformations for reading and writing */
3494 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3495 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3497 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3499 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3500 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3501 png_infop info_ptr));
3502 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3503 png_infop info_ptr));
3504 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3505 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3506 png_uint_32 length));
3507 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3508 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3509 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3510 png_bytep buffer, png_size_t buffer_length));
3511 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3512 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3513 png_bytep buffer, png_size_t buffer_length));
3514 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3515 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3516 png_infop info_ptr, png_uint_32 length));
3517 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3518 png_infop info_ptr));
3519 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3520 png_infop info_ptr));
3521 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3522 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3523 png_infop info_ptr));
3524 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3525 png_infop info_ptr));
3526 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3527 #if defined(PNG_READ_tEXt_SUPPORTED)
3528 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3529 png_infop info_ptr, png_uint_32 length));
3530 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3531 png_infop info_ptr));
3532 #endif
3533 #if defined(PNG_READ_zTXt_SUPPORTED)
3534 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3535 png_infop info_ptr, png_uint_32 length));
3536 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3537 png_infop info_ptr));
3538 #endif
3539 #if defined(PNG_READ_iTXt_SUPPORTED)
3540 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3541 png_infop info_ptr, png_uint_32 length));
3542 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3543 png_infop info_ptr));
3544 #endif
3546 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3548 #ifdef PNG_MNG_FEATURES_SUPPORTED
3549 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3550 png_bytep row));
3551 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3552 png_bytep row));
3553 #endif
3555 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3556 #if defined(PNG_MMX_CODE_SUPPORTED)
3557 /* png.c */ /* PRIVATE */
3558 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3559 #endif
3560 #endif
3562 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3563 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3564 png_infop info_ptr));
3566 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3567 png_infop info_ptr));
3569 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3570 png_infop info_ptr));
3572 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3573 png_infop info_ptr));
3575 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3576 png_infop info_ptr));
3578 #if defined(PNG_pHYs_SUPPORTED)
3579 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3580 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3581 #endif /* PNG_pHYs_SUPPORTED */
3582 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3584 /* Read the chunk header (length + type name) */
3585 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
3587 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3589 #endif /* PNG_INTERNAL */
3591 #ifdef __cplusplus
3592 }
3593 #endif
3595 #endif /* PNG_VERSION_INFO_ONLY */
3596 /* do not put anything past this line */
3597 #endif /* PNG_H */