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1 /* png.h - header file for PNG reference library
2 *
3 * libpng version 1.2.36 - May 7, 2009
4 * Copyright (c) 1998-2009 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 1.2.36 - May 7, 2009: 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 * 1.2.34beta01-07 13 10234 12.so.0.34[.0]
216 * 1.0.42rc01 10 10042 10.so.0.42[.0]
217 * 1.2.34rc01 13 10234 12.so.0.34[.0]
218 * 1.0.42 10 10042 10.so.0.42[.0]
219 * 1.2.34 13 10234 12.so.0.34[.0]
220 * 1.2.35beta01-03 13 10235 12.so.0.35[.0]
221 * 1.0.43rc01-02 10 10043 10.so.0.43[.0]
222 * 1.2.35rc01-02 13 10235 12.so.0.35[.0]
223 * 1.0.43 10 10043 10.so.0.43[.0]
224 * 1.2.35 13 10235 12.so.0.35[.0]
225 * 1.2.36beta01-05 13 10236 12.so.0.36[.0]
226 * 1.2.36rc01 13 10236 12.so.0.36[.0]
227 * 1.0.44 10 10044 10.so.0.44[.0]
228 * 1.2.36 13 10236 12.so.0.36[.0]
229 *
230 * Henceforth the source version will match the shared-library major
231 * and minor numbers; the shared-library major version number will be
232 * used for changes in backward compatibility, as it is intended. The
233 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
234 * for applications, is an unsigned integer of the form xyyzz corresponding
235 * to the source version x.y.z (leading zeros in y and z). Beta versions
236 * were given the previous public release number plus a letter, until
237 * version 1.0.6j; from then on they were given the upcoming public
238 * release number plus "betaNN" or "rcNN".
239 *
240 * Binary incompatibility exists only when applications make direct access
241 * to the info_ptr or png_ptr members through png.h, and the compiled
242 * application is loaded with a different version of the library.
243 *
244 * DLLNUM will change each time there are forward or backward changes
245 * in binary compatibility (e.g., when a new feature is added).
246 *
247 * See libpng.txt or libpng.3 for more information. The PNG specification
248 * is available as a W3C Recommendation and as an ISO Specification,
249 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
250 */
251
252 /*
253 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
254 *
255 * If you modify libpng you may insert additional notices immediately following
256 * this sentence.
257 *
258 * libpng versions 1.2.6, August 15, 2004, through 1.2.36, May 7, 2009, are
259 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
260 * distributed according to the same disclaimer and license as libpng-1.2.5
261 * with the following individual added to the list of Contributing Authors:
262 *
263 * Cosmin Truta
264 *
265 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
266 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
267 * distributed according to the same disclaimer and license as libpng-1.0.6
268 * with the following individuals added to the list of Contributing Authors:
269 *
270 * Simon-Pierre Cadieux
271 * Eric S. Raymond
272 * Gilles Vollant
273 *
274 * and with the following additions to the disclaimer:
275 *
276 * There is no warranty against interference with your enjoyment of the
277 * library or against infringement. There is no warranty that our
278 * efforts or the library will fulfill any of your particular purposes
279 * or needs. This library is provided with all faults, and the entire
280 * risk of satisfactory quality, performance, accuracy, and effort is with
281 * the user.
282 *
283 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
284 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
285 * distributed according to the same disclaimer and license as libpng-0.96,
286 * with the following individuals added to the list of Contributing Authors:
287 *
288 * Tom Lane
289 * Glenn Randers-Pehrson
290 * Willem van Schaik
291 *
292 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
293 * Copyright (c) 1996, 1997 Andreas Dilger
294 * Distributed according to the same disclaimer and license as libpng-0.88,
295 * with the following individuals added to the list of Contributing Authors:
296 *
297 * John Bowler
298 * Kevin Bracey
299 * Sam Bushell
300 * Magnus Holmgren
301 * Greg Roelofs
302 * Tom Tanner
303 *
304 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
305 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
306 *
307 * For the purposes of this copyright and license, "Contributing Authors"
308 * is defined as the following set of individuals:
309 *
310 * Andreas Dilger
311 * Dave Martindale
312 * Guy Eric Schalnat
313 * Paul Schmidt
314 * Tim Wegner
315 *
316 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
317 * and Group 42, Inc. disclaim all warranties, expressed or implied,
318 * including, without limitation, the warranties of merchantability and of
319 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
320 * assume no liability for direct, indirect, incidental, special, exemplary,
321 * or consequential damages, which may result from the use of the PNG
322 * Reference Library, even if advised of the possibility of such damage.
323 *
324 * Permission is hereby granted to use, copy, modify, and distribute this
325 * source code, or portions hereof, for any purpose, without fee, subject
326 * to the following restrictions:
327 *
328 * 1. The origin of this source code must not be misrepresented.
329 *
330 * 2. Altered versions must be plainly marked as such and
331 * must not be misrepresented as being the original source.
332 *
333 * 3. This Copyright notice may not be removed or altered from
334 * any source or altered source distribution.
335 *
336 * The Contributing Authors and Group 42, Inc. specifically permit, without
337 * fee, and encourage the use of this source code as a component to
338 * supporting the PNG file format in commercial products. If you use this
339 * source code in a product, acknowledgment is not required but would be
340 * appreciated.
341 */
342
343 /*
344 * A "png_get_copyright" function is available, for convenient use in "about"
345 * boxes and the like:
346 *
347 * printf("%s",png_get_copyright(NULL));
348 *
349 * Also, the PNG logo (in PNG format, of course) is supplied in the
350 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
351 */
352
353 /*
354 * Libpng is OSI Certified Open Source Software. OSI Certified is a
355 * certification mark of the Open Source Initiative.
356 */
357
358 /*
359 * The contributing authors would like to thank all those who helped
360 * with testing, bug fixes, and patience. This wouldn't have been
361 * possible without all of you.
362 *
363 * Thanks to Frank J. T. Wojcik for helping with the documentation.
364 */
365
366 /*
367 * Y2K compliance in libpng:
368 * =========================
369 *
370 * May 7, 2009
371 *
372 * Since the PNG Development group is an ad-hoc body, we can't make
373 * an official declaration.
374 *
375 * This is your unofficial assurance that libpng from version 0.71 and
376 * upward through 1.2.36 are Y2K compliant. It is my belief that earlier
377 * versions were also Y2K compliant.
378 *
379 * Libpng only has three year fields. One is a 2-byte unsigned integer
380 * that will hold years up to 65535. The other two hold the date in text
381 * format, and will hold years up to 9999.
382 *
383 * The integer is
384 * "png_uint_16 year" in png_time_struct.
385 *
386 * The strings are
387 * "png_charp time_buffer" in png_struct and
388 * "near_time_buffer", which is a local character string in png.c.
389 *
390 * There are seven time-related functions:
391 * png.c: png_convert_to_rfc_1123() in png.c
392 * (formerly png_convert_to_rfc_1152() in error)
393 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
394 * png_convert_from_time_t() in pngwrite.c
395 * png_get_tIME() in pngget.c
396 * png_handle_tIME() in pngrutil.c, called in pngread.c
397 * png_set_tIME() in pngset.c
398 * png_write_tIME() in pngwutil.c, called in pngwrite.c
399 *
400 * All handle dates properly in a Y2K environment. The
401 * png_convert_from_time_t() function calls gmtime() to convert from system
402 * clock time, which returns (year - 1900), which we properly convert to
403 * the full 4-digit year. There is a possibility that applications using
404 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
405 * function, or that they are incorrectly passing only a 2-digit year
406 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
407 * but this is not under our control. The libpng documentation has always
408 * stated that it works with 4-digit years, and the APIs have been
409 * documented as such.
410 *
411 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
412 * integer to hold the year, and can hold years as large as 65535.
413 *
414 * zlib, upon which libpng depends, is also Y2K compliant. It contains
415 * no date-related code.
416 *
417 * Glenn Randers-Pehrson
418 * libpng maintainer
419 * PNG Development Group
420 */
421
422 #ifndef PNG_H
423 #define PNG_H
424
425 /* This is not the place to learn how to use libpng. The file libpng.txt
426 * describes how to use libpng, and the file example.c summarizes it
427 * with some code on which to build. This file is useful for looking
428 * at the actual function definitions and structure components.
429 */
430
431 /* Version information for png.h - this should match the version in png.c */
432 #define PNG_LIBPNG_VER_STRING "1.2.36"
433 #define PNG_HEADER_VERSION_STRING \
434 " libpng version 1.2.36 - May 7, 2009\n"
435
436 #define PNG_LIBPNG_VER_SONUM 0
437 #define PNG_LIBPNG_VER_DLLNUM 13
438
439 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
440 #define PNG_LIBPNG_VER_MAJOR 1
441 #define PNG_LIBPNG_VER_MINOR 2
442 #define PNG_LIBPNG_VER_RELEASE 36
443 /* This should match the numeric part of the final component of
444 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
445
446 #define PNG_LIBPNG_VER_BUILD 0
447
448 /* Release Status */
449 #define PNG_LIBPNG_BUILD_ALPHA 1
450 #define PNG_LIBPNG_BUILD_BETA 2
451 #define PNG_LIBPNG_BUILD_RC 3
452 #define PNG_LIBPNG_BUILD_STABLE 4
453 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
454
455 /* Release-Specific Flags */
456 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
457 PNG_LIBPNG_BUILD_STABLE only */
458 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
459 PNG_LIBPNG_BUILD_SPECIAL */
460 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
461 PNG_LIBPNG_BUILD_PRIVATE */
462
463 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
464
465 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
466 * We must not include leading zeros.
467 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
468 * version 1.0.0 was mis-numbered 100 instead of 10000). From
469 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
470 #define PNG_LIBPNG_VER 10236 /* 1.2.36 */
471
472 #ifndef PNG_VERSION_INFO_ONLY
473 /* include the compression library's header */
474 #include "zlib.h"
475 #endif
476
477 /* include all user configurable info, including optional assembler routines */
478 #include "pngconf.h"
479
480 /*
481 * Added at libpng-1.2.8 */
482 /* Ref MSDN: Private as priority over Special
483 * VS_FF_PRIVATEBUILD File *was not* built using standard release
484 * procedures. If this value is given, the StringFileInfo block must
485 * contain a PrivateBuild string.
486 *
487 * VS_FF_SPECIALBUILD File *was* built by the original company using
488 * standard release procedures but is a variation of the standard
489 * file of the same version number. If this value is given, the
490 * StringFileInfo block must contain a SpecialBuild string.
491 */
492
493 #if defined(PNG_USER_PRIVATEBUILD)
494 # define PNG_LIBPNG_BUILD_TYPE \
495 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
496 #else
497 # if defined(PNG_LIBPNG_SPECIALBUILD)
498 # define PNG_LIBPNG_BUILD_TYPE \
499 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
500 # else
501 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
502 # endif
503 #endif
504
505 #ifndef PNG_VERSION_INFO_ONLY
506
507 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
508 #ifdef __cplusplus
509 extern "C" {
510 #endif /* __cplusplus */
511
512 /* This file is arranged in several sections. The first section contains
513 * structure and type definitions. The second section contains the external
514 * library functions, while the third has the internal library functions,
515 * which applications aren't expected to use directly.
516 */
517
518 #ifndef PNG_NO_TYPECAST_NULL
519 #define int_p_NULL (int *)NULL
520 #define png_bytep_NULL (png_bytep)NULL
521 #define png_bytepp_NULL (png_bytepp)NULL
522 #define png_doublep_NULL (png_doublep)NULL
523 #define png_error_ptr_NULL (png_error_ptr)NULL
524 #define png_flush_ptr_NULL (png_flush_ptr)NULL
525 #define png_free_ptr_NULL (png_free_ptr)NULL
526 #define png_infopp_NULL (png_infopp)NULL
527 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
528 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
529 #define png_rw_ptr_NULL (png_rw_ptr)NULL
530 #define png_structp_NULL (png_structp)NULL
531 #define png_uint_16p_NULL (png_uint_16p)NULL
532 #define png_voidp_NULL (png_voidp)NULL
533 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
534 #else
535 #define int_p_NULL NULL
536 #define png_bytep_NULL NULL
537 #define png_bytepp_NULL NULL
538 #define png_doublep_NULL NULL
539 #define png_error_ptr_NULL NULL
540 #define png_flush_ptr_NULL NULL
541 #define png_free_ptr_NULL NULL
542 #define png_infopp_NULL NULL
543 #define png_malloc_ptr_NULL NULL
544 #define png_read_status_ptr_NULL NULL
545 #define png_rw_ptr_NULL NULL
546 #define png_structp_NULL NULL
547 #define png_uint_16p_NULL NULL
548 #define png_voidp_NULL NULL
549 #define png_write_status_ptr_NULL NULL
550 #endif
551
552 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
553 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
554 /* Version information for C files, stored in png.c. This had better match
555 * the version above.
556 */
557 #ifdef PNG_USE_GLOBAL_ARRAYS
558 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
559 /* need room for 99.99.99beta99z */
560 #else
561 #define png_libpng_ver png_get_header_ver(NULL)
562 #endif
563
564 #ifdef PNG_USE_GLOBAL_ARRAYS
565 /* This was removed in version 1.0.5c */
566 /* Structures to facilitate easy interlacing. See png.c for more details */
567 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
568 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
569 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
570 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
571 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
572 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
573 /* This isn't currently used. If you need it, see png.c for more details.
574 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
575 */
576 #endif
577
578 #endif /* PNG_NO_EXTERN */
579
580 /* Three color definitions. The order of the red, green, and blue, (and the
581 * exact size) is not important, although the size of the fields need to
582 * be png_byte or png_uint_16 (as defined below).
583 */
584 typedef struct png_color_struct
585 {
586 png_byte red;
587 png_byte green;
588 png_byte blue;
589 } png_color;
590 typedef png_color FAR * png_colorp;
591 typedef png_color FAR * FAR * png_colorpp;
592
593 typedef struct png_color_16_struct
594 {
595 png_byte index; /* used for palette files */
596 png_uint_16 red; /* for use in red green blue files */
597 png_uint_16 green;
598 png_uint_16 blue;
599 png_uint_16 gray; /* for use in grayscale files */
600 } png_color_16;
601 typedef png_color_16 FAR * png_color_16p;
602 typedef png_color_16 FAR * FAR * png_color_16pp;
603
604 typedef struct png_color_8_struct
605 {
606 png_byte red; /* for use in red green blue files */
607 png_byte green;
608 png_byte blue;
609 png_byte gray; /* for use in grayscale files */
610 png_byte alpha; /* for alpha channel files */
611 } png_color_8;
612 typedef png_color_8 FAR * png_color_8p;
613 typedef png_color_8 FAR * FAR * png_color_8pp;
614
615 /*
616 * The following two structures are used for the in-core representation
617 * of sPLT chunks.
618 */
619 typedef struct png_sPLT_entry_struct
620 {
621 png_uint_16 red;
622 png_uint_16 green;
623 png_uint_16 blue;
624 png_uint_16 alpha;
625 png_uint_16 frequency;
626 } png_sPLT_entry;
627 typedef png_sPLT_entry FAR * png_sPLT_entryp;
628 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
629
630 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
631 * occupy the LSB of their respective members, and the MSB of each member
632 * is zero-filled. The frequency member always occupies the full 16 bits.
633 */
634
635 typedef struct png_sPLT_struct
636 {
637 png_charp name; /* palette name */
638 png_byte depth; /* depth of palette samples */
639 png_sPLT_entryp entries; /* palette entries */
640 png_int_32 nentries; /* number of palette entries */
641 } png_sPLT_t;
642 typedef png_sPLT_t FAR * png_sPLT_tp;
643 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
644
645 #ifdef PNG_TEXT_SUPPORTED
646 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
647 * and whether that contents is compressed or not. The "key" field
648 * points to a regular zero-terminated C string. The "text", "lang", and
649 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
650 * However, the * structure returned by png_get_text() will always contain
651 * regular zero-terminated C strings (possibly empty), never NULL pointers,
652 * so they can be safely used in printf() and other string-handling functions.
653 */
654 typedef struct png_text_struct
655 {
656 int compression; /* compression value:
657 -1: tEXt, none
658 0: zTXt, deflate
659 1: iTXt, none
660 2: iTXt, deflate */
661 png_charp key; /* keyword, 1-79 character description of "text" */
662 png_charp text; /* comment, may be an empty string (ie "")
663 or a NULL pointer */
664 png_size_t text_length; /* length of the text string */
665 #ifdef PNG_iTXt_SUPPORTED
666 png_size_t itxt_length; /* length of the itxt string */
667 png_charp lang; /* language code, 0-79 characters
668 or a NULL pointer */
669 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
670 chars or a NULL pointer */
671 #endif
672 } png_text;
673 typedef png_text FAR * png_textp;
674 typedef png_text FAR * FAR * png_textpp;
675 #endif
676
677 /* Supported compression types for text in PNG files (tEXt, and zTXt).
678 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
679 #define PNG_TEXT_COMPRESSION_NONE_WR -3
680 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
681 #define PNG_TEXT_COMPRESSION_NONE -1
682 #define PNG_TEXT_COMPRESSION_zTXt 0
683 #define PNG_ITXT_COMPRESSION_NONE 1
684 #define PNG_ITXT_COMPRESSION_zTXt 2
685 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
686
687 /* png_time is a way to hold the time in an machine independent way.
688 * Two conversions are provided, both from time_t and struct tm. There
689 * is no portable way to convert to either of these structures, as far
690 * as I know. If you know of a portable way, send it to me. As a side
691 * note - PNG has always been Year 2000 compliant!
692 */
693 typedef struct png_time_struct
694 {
695 png_uint_16 year; /* full year, as in, 1995 */
696 png_byte month; /* month of year, 1 - 12 */
697 png_byte day; /* day of month, 1 - 31 */
698 png_byte hour; /* hour of day, 0 - 23 */
699 png_byte minute; /* minute of hour, 0 - 59 */
700 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
701 } png_time;
702 typedef png_time FAR * png_timep;
703 typedef png_time FAR * FAR * png_timepp;
704
705 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
706 /* png_unknown_chunk is a structure to hold queued chunks for which there is
707 * no specific support. The idea is that we can use this to queue
708 * up private chunks for output even though the library doesn't actually
709 * know about their semantics.
710 */
711 #define PNG_CHUNK_NAME_LENGTH 5
712 typedef struct png_unknown_chunk_t
713 {
714 png_byte name[PNG_CHUNK_NAME_LENGTH];
715 png_byte *data;
716 png_size_t size;
717
718 /* libpng-using applications should NOT directly modify this byte. */
719 png_byte location; /* mode of operation at read time */
720 }
721 png_unknown_chunk;
722 typedef png_unknown_chunk FAR * png_unknown_chunkp;
723 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
724 #endif
725
726 /* png_info is a structure that holds the information in a PNG file so
727 * that the application can find out the characteristics of the image.
728 * If you are reading the file, this structure will tell you what is
729 * in the PNG file. If you are writing the file, fill in the information
730 * you want to put into the PNG file, then call png_write_info().
731 * The names chosen should be very close to the PNG specification, so
732 * consult that document for information about the meaning of each field.
733 *
734 * With libpng < 0.95, it was only possible to directly set and read the
735 * the values in the png_info_struct, which meant that the contents and
736 * order of the values had to remain fixed. With libpng 0.95 and later,
737 * however, there are now functions that abstract the contents of
738 * png_info_struct from the application, so this makes it easier to use
739 * libpng with dynamic libraries, and even makes it possible to use
740 * libraries that don't have all of the libpng ancillary chunk-handing
741 * functionality.
742 *
743 * In any case, the order of the parameters in png_info_struct should NOT
744 * be changed for as long as possible to keep compatibility with applications
745 * that use the old direct-access method with png_info_struct.
746 *
747 * The following members may have allocated storage attached that should be
748 * cleaned up before the structure is discarded: palette, trans, text,
749 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
750 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
751 * are automatically freed when the info structure is deallocated, if they were
752 * allocated internally by libpng. This behavior can be changed by means
753 * of the png_data_freer() function.
754 *
755 * More allocation details: all the chunk-reading functions that
756 * change these members go through the corresponding png_set_*
757 * functions. A function to clear these members is available: see
758 * png_free_data(). The png_set_* functions do not depend on being
759 * able to point info structure members to any of the storage they are
760 * passed (they make their own copies), EXCEPT that the png_set_text
761 * functions use the same storage passed to them in the text_ptr or
762 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
763 * functions do not make their own copies.
764 */
765 typedef struct png_info_struct
766 {
767 /* the following are necessary for every PNG file */
768 png_uint_32 width; /* width of image in pixels (from IHDR) */
769 png_uint_32 height; /* height of image in pixels (from IHDR) */
770 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
771 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
772 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
773 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
774 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
775 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
776 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
777 /* The following three should have been named *_method not *_type */
778 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
779 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
780 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
781
782 /* The following is informational only on read, and not used on writes. */
783 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
784 png_byte pixel_depth; /* number of bits per pixel */
785 png_byte spare_byte; /* to align the data, and for future use */
786 png_byte signature[8]; /* magic bytes read by libpng from start of file */
787
788 /* The rest of the data is optional. If you are reading, check the
789 * valid field to see if the information in these are valid. If you
790 * are writing, set the valid field to those chunks you want written,
791 * and initialize the appropriate fields below.
792 */
793
794 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
795 /* The gAMA chunk describes the gamma characteristics of the system
796 * on which the image was created, normally in the range [1.0, 2.5].
797 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
798 */
799 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
800 #endif
801
802 #if defined(PNG_sRGB_SUPPORTED)
803 /* GR-P, 0.96a */
804 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
805 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
806 #endif
807
808 #if defined(PNG_TEXT_SUPPORTED)
809 /* The tEXt, and zTXt chunks contain human-readable textual data in
810 * uncompressed, compressed, and optionally compressed forms, respectively.
811 * The data in "text" is an array of pointers to uncompressed,
812 * null-terminated C strings. Each chunk has a keyword that describes the
813 * textual data contained in that chunk. Keywords are not required to be
814 * unique, and the text string may be empty. Any number of text chunks may
815 * be in an image.
816 */
817 int num_text; /* number of comments read/to write */
818 int max_text; /* current size of text array */
819 png_textp text; /* array of comments read/to write */
820 #endif /* PNG_TEXT_SUPPORTED */
821
822 #if defined(PNG_tIME_SUPPORTED)
823 /* The tIME chunk holds the last time the displayed image data was
824 * modified. See the png_time struct for the contents of this struct.
825 */
826 png_time mod_time;
827 #endif
828
829 #if defined(PNG_sBIT_SUPPORTED)
830 /* The sBIT chunk specifies the number of significant high-order bits
831 * in the pixel data. Values are in the range [1, bit_depth], and are
832 * only specified for the channels in the pixel data. The contents of
833 * the low-order bits is not specified. Data is valid if
834 * (valid & PNG_INFO_sBIT) is non-zero.
835 */
836 png_color_8 sig_bit; /* significant bits in color channels */
837 #endif
838
839 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
840 defined(PNG_READ_BACKGROUND_SUPPORTED)
841 /* The tRNS chunk supplies transparency data for paletted images and
842 * other image types that don't need a full alpha channel. There are
843 * "num_trans" transparency values for a paletted image, stored in the
844 * same order as the palette colors, starting from index 0. Values
845 * for the data are in the range [0, 255], ranging from fully transparent
846 * to fully opaque, respectively. For non-paletted images, there is a
847 * single color specified that should be treated as fully transparent.
848 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
849 */
850 png_bytep trans; /* transparent values for paletted image */
851 png_color_16 trans_values; /* transparent color for non-palette image */
852 #endif
853
854 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
855 /* The bKGD chunk gives the suggested image background color if the
856 * display program does not have its own background color and the image
857 * is needs to composited onto a background before display. The colors
858 * in "background" are normally in the same color space/depth as the
859 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
860 */
861 png_color_16 background;
862 #endif
863
864 #if defined(PNG_oFFs_SUPPORTED)
865 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
866 * and downwards from the top-left corner of the display, page, or other
867 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
868 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
869 */
870 png_int_32 x_offset; /* x offset on page */
871 png_int_32 y_offset; /* y offset on page */
872 png_byte offset_unit_type; /* offset units type */
873 #endif
874
875 #if defined(PNG_pHYs_SUPPORTED)
876 /* The pHYs chunk gives the physical pixel density of the image for
877 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
878 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
879 */
880 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
881 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
882 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
883 #endif
884
885 #if defined(PNG_hIST_SUPPORTED)
886 /* The hIST chunk contains the relative frequency or importance of the
887 * various palette entries, so that a viewer can intelligently select a
888 * reduced-color palette, if required. Data is an array of "num_palette"
889 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
890 * is non-zero.
891 */
892 png_uint_16p hist;
893 #endif
894
895 #ifdef PNG_cHRM_SUPPORTED
896 /* The cHRM chunk describes the CIE color characteristics of the monitor
897 * on which the PNG was created. This data allows the viewer to do gamut
898 * mapping of the input image to ensure that the viewer sees the same
899 * colors in the image as the creator. Values are in the range
900 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
901 */
902 #ifdef PNG_FLOATING_POINT_SUPPORTED
903 float x_white;
904 float y_white;
905 float x_red;
906 float y_red;
907 float x_green;
908 float y_green;
909 float x_blue;
910 float y_blue;
911 #endif
912 #endif
913
914 #if defined(PNG_pCAL_SUPPORTED)
915 /* The pCAL chunk describes a transformation between the stored pixel
916 * values and original physical data values used to create the image.
917 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
918 * range given by [pcal_X0, pcal_X1], and are further transformed by a
919 * (possibly non-linear) transformation function given by "pcal_type"
920 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
921 * defines below, and the PNG-Group's PNG extensions document for a
922 * complete description of the transformations and how they should be
923 * implemented, and for a description of the ASCII parameter strings.
924 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
925 */
926 png_charp pcal_purpose; /* pCAL chunk description string */
927 png_int_32 pcal_X0; /* minimum value */
928 png_int_32 pcal_X1; /* maximum value */
929 png_charp pcal_units; /* Latin-1 string giving physical units */
930 png_charpp pcal_params; /* ASCII strings containing parameter values */
931 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
932 png_byte pcal_nparams; /* number of parameters given in pcal_params */
933 #endif
934
935 /* New members added in libpng-1.0.6 */
936 #ifdef PNG_FREE_ME_SUPPORTED
937 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
938 #endif
939
940 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
941 /* storage for unknown chunks that the library doesn't recognize. */
942 png_unknown_chunkp unknown_chunks;
943 png_size_t unknown_chunks_num;
944 #endif
945
946 #if defined(PNG_iCCP_SUPPORTED)
947 /* iCCP chunk data. */
948 png_charp iccp_name; /* profile name */
949 png_charp iccp_profile; /* International Color Consortium profile data */
950 /* Note to maintainer: should be png_bytep */
951 png_uint_32 iccp_proflen; /* ICC profile data length */
952 png_byte iccp_compression; /* Always zero */
953 #endif
954
955 #if defined(PNG_sPLT_SUPPORTED)
956 /* data on sPLT chunks (there may be more than one). */
957 png_sPLT_tp splt_palettes;
958 png_uint_32 splt_palettes_num;
959 #endif
960
961 #if defined(PNG_sCAL_SUPPORTED)
962 /* The sCAL chunk describes the actual physical dimensions of the
963 * subject matter of the graphic. The chunk contains a unit specification
964 * a byte value, and two ASCII strings representing floating-point
965 * values. The values are width and height corresponsing to one pixel
966 * in the image. This external representation is converted to double
967 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
968 */
969 png_byte scal_unit; /* unit of physical scale */
970 #ifdef PNG_FLOATING_POINT_SUPPORTED
971 double scal_pixel_width; /* width of one pixel */
972 double scal_pixel_height; /* height of one pixel */
973 #endif
974 #ifdef PNG_FIXED_POINT_SUPPORTED
975 png_charp scal_s_width; /* string containing height */
976 png_charp scal_s_height; /* string containing width */
977 #endif
978 #endif
979
980 #if defined(PNG_INFO_IMAGE_SUPPORTED)
981 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
982 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
983 png_bytepp row_pointers; /* the image bits */
984 #endif
985
986 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
987 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
988 #endif
989
990 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
991 png_fixed_point int_x_white;
992 png_fixed_point int_y_white;
993 png_fixed_point int_x_red;
994 png_fixed_point int_y_red;
995 png_fixed_point int_x_green;
996 png_fixed_point int_y_green;
997 png_fixed_point int_x_blue;
998 png_fixed_point int_y_blue;
999 #endif
1000
1001 } png_info;
1002
1003 typedef png_info FAR * png_infop;
1004 typedef png_info FAR * FAR * png_infopp;
1005
1006 /* Maximum positive integer used in PNG is (2^31)-1 */
1007 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
1008 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
1009 #define PNG_SIZE_MAX ((png_size_t)(-1))
1010 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1011 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
1012 #define PNG_MAX_UINT PNG_UINT_31_MAX
1013 #endif
1014
1015 /* These describe the color_type field in png_info. */
1016 /* color type masks */
1017 #define PNG_COLOR_MASK_PALETTE 1
1018 #define PNG_COLOR_MASK_COLOR 2
1019 #define PNG_COLOR_MASK_ALPHA 4
1020
1021 /* color types. Note that not all combinations are legal */
1022 #define PNG_COLOR_TYPE_GRAY 0
1023 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
1024 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
1025 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
1026 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
1027 /* aliases */
1028 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
1029 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
1030
1031 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
1032 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
1033 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1034
1035 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
1036 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1037 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1038 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1039
1040 /* These are for the interlacing type. These values should NOT be changed. */
1041 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1042 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1043 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
1044
1045 /* These are for the oFFs chunk. These values should NOT be changed. */
1046 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1047 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1048 #define PNG_OFFSET_LAST 2 /* Not a valid value */
1049
1050 /* These are for the pCAL chunk. These values should NOT be changed. */
1051 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1052 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1053 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1054 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1055 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1056
1057 /* These are for the sCAL chunk. These values should NOT be changed. */
1058 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1059 #define PNG_SCALE_METER 1 /* meters per pixel */
1060 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1061 #define PNG_SCALE_LAST 3 /* Not a valid value */
1062
1063 /* These are for the pHYs chunk. These values should NOT be changed. */
1064 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1065 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1066 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1067
1068 /* These are for the sRGB chunk. These values should NOT be changed. */
1069 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1070 #define PNG_sRGB_INTENT_RELATIVE 1
1071 #define PNG_sRGB_INTENT_SATURATION 2
1072 #define PNG_sRGB_INTENT_ABSOLUTE 3
1073 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1074
1075 /* This is for text chunks */
1076 #define PNG_KEYWORD_MAX_LENGTH 79
1077
1078 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1079 #define PNG_MAX_PALETTE_LENGTH 256
1080
1081 /* These determine if an ancillary chunk's data has been successfully read
1082 * from the PNG header, or if the application has filled in the corresponding
1083 * data in the info_struct to be written into the output file. The values
1084 * of the PNG_INFO_<chunk> defines should NOT be changed.
1085 */
1086 #define PNG_INFO_gAMA 0x0001
1087 #define PNG_INFO_sBIT 0x0002
1088 #define PNG_INFO_cHRM 0x0004
1089 #define PNG_INFO_PLTE 0x0008
1090 #define PNG_INFO_tRNS 0x0010
1091 #define PNG_INFO_bKGD 0x0020
1092 #define PNG_INFO_hIST 0x0040
1093 #define PNG_INFO_pHYs 0x0080
1094 #define PNG_INFO_oFFs 0x0100
1095 #define PNG_INFO_tIME 0x0200
1096 #define PNG_INFO_pCAL 0x0400
1097 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1098 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1099 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1100 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1101 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1102
1103 /* This is used for the transformation routines, as some of them
1104 * change these values for the row. It also should enable using
1105 * the routines for other purposes.
1106 */
1107 typedef struct png_row_info_struct
1108 {
1109 png_uint_32 width; /* width of row */
1110 png_uint_32 rowbytes; /* number of bytes in row */
1111 png_byte color_type; /* color type of row */
1112 png_byte bit_depth; /* bit depth of row */
1113 png_byte channels; /* number of channels (1, 2, 3, or 4) */
1114 png_byte pixel_depth; /* bits per pixel (depth * channels) */
1115 } png_row_info;
1116
1117 typedef png_row_info FAR * png_row_infop;
1118 typedef png_row_info FAR * FAR * png_row_infopp;
1119
1120 /* These are the function types for the I/O functions and for the functions
1121 * that allow the user to override the default I/O functions with his or her
1122 * own. The png_error_ptr type should match that of user-supplied warning
1123 * and error functions, while the png_rw_ptr type should match that of the
1124 * user read/write data functions.
1125 */
1126 typedef struct png_struct_def png_struct;
1127 typedef png_struct FAR * png_structp;
1128
1129 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1130 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1131 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1132 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1133 int));
1134 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1135 int));
1136
1137 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1138 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1139 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1140 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1141 png_uint_32, int));
1142 #endif
1143
1144 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1145 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1146 defined(PNG_LEGACY_SUPPORTED)
1147 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1148 png_row_infop, png_bytep));
1149 #endif
1150
1151 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1152 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1153 #endif
1154 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1155 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1156 #endif
1157
1158 /* Transform masks for the high-level interface */
1159 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1160 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1161 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1162 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1163 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1164 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1165 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1166 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1167 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1168 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1169 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1170 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1171 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */
1172 /* Added to libpng-1.2.34 */
1173 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */
1174 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */
1175
1176 /* Flags for MNG supported features */
1177 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1178 #define PNG_FLAG_MNG_FILTER_64 0x04
1179 #define PNG_ALL_MNG_FEATURES 0x05
1180
1181 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1182 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1183
1184 /* The structure that holds the information to read and write PNG files.
1185 * The only people who need to care about what is inside of this are the
1186 * people who will be modifying the library for their own special needs.
1187 * It should NOT be accessed directly by an application, except to store
1188 * the jmp_buf.
1189 */
1190
1191 struct png_struct_def
1192 {
1193 #ifdef PNG_SETJMP_SUPPORTED
1194 jmp_buf jmpbuf; /* used in png_error */
1195 #endif
1196 png_error_ptr error_fn; /* function for printing errors and aborting */
1197 png_error_ptr warning_fn; /* function for printing warnings */
1198 png_voidp error_ptr; /* user supplied struct for error functions */
1199 png_rw_ptr write_data_fn; /* function for writing output data */
1200 png_rw_ptr read_data_fn; /* function for reading input data */
1201 png_voidp io_ptr; /* ptr to application struct for I/O functions */
1202
1203 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1204 png_user_transform_ptr read_user_transform_fn; /* user read transform */
1205 #endif
1206
1207 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1208 png_user_transform_ptr write_user_transform_fn; /* user write transform */
1209 #endif
1210
1211 /* These were added in libpng-1.0.2 */
1212 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1213 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1214 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1215 png_voidp user_transform_ptr; /* user supplied struct for user transform */
1216 png_byte user_transform_depth; /* bit depth of user transformed pixels */
1217 png_byte user_transform_channels; /* channels in user transformed pixels */
1218 #endif
1219 #endif
1220
1221 png_uint_32 mode; /* tells us where we are in the PNG file */
1222 png_uint_32 flags; /* flags indicating various things to libpng */
1223 png_uint_32 transformations; /* which transformations to perform */
1224
1225 z_stream zstream; /* pointer to decompression structure (below) */
1226 png_bytep zbuf; /* buffer for zlib */
1227 png_size_t zbuf_size; /* size of zbuf */
1228 int zlib_level; /* holds zlib compression level */
1229 int zlib_method; /* holds zlib compression method */
1230 int zlib_window_bits; /* holds zlib compression window bits */
1231 int zlib_mem_level; /* holds zlib compression memory level */
1232 int zlib_strategy; /* holds zlib compression strategy */
1233
1234 png_uint_32 width; /* width of image in pixels */
1235 png_uint_32 height; /* height of image in pixels */
1236 png_uint_32 num_rows; /* number of rows in current pass */
1237 png_uint_32 usr_width; /* width of row at start of write */
1238 png_uint_32 rowbytes; /* size of row in bytes */
1239 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1240 png_uint_32 iwidth; /* width of current interlaced row in pixels */
1241 png_uint_32 row_number; /* current row in interlace pass */
1242 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1243 png_bytep row_buf; /* buffer to save current (unfiltered) row */
1244 #ifndef PNG_NO_WRITE_FILTER
1245 png_bytep sub_row; /* buffer to save "sub" row when filtering */
1246 png_bytep up_row; /* buffer to save "up" row when filtering */
1247 png_bytep avg_row; /* buffer to save "avg" row when filtering */
1248 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1249 #endif
1250 png_row_info row_info; /* used for transformation routines */
1251
1252 png_uint_32 idat_size; /* current IDAT size for read */
1253 png_uint_32 crc; /* current chunk CRC value */
1254 png_colorp palette; /* palette from the input file */
1255 png_uint_16 num_palette; /* number of color entries in palette */
1256 png_uint_16 num_trans; /* number of transparency values */
1257 png_byte chunk_name[5]; /* null-terminated name of current chunk */
1258 png_byte compression; /* file compression type (always 0) */
1259 png_byte filter; /* file filter type (always 0) */
1260 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1261 png_byte pass; /* current interlace pass (0 - 6) */
1262 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1263 png_byte color_type; /* color type of file */
1264 png_byte bit_depth; /* bit depth of file */
1265 png_byte usr_bit_depth; /* bit depth of users row */
1266 png_byte pixel_depth; /* number of bits per pixel */
1267 png_byte channels; /* number of channels in file */
1268 png_byte usr_channels; /* channels at start of write */
1269 png_byte sig_bytes; /* magic bytes read/written from start of file */
1270
1271 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1272 #ifdef PNG_LEGACY_SUPPORTED
1273 png_byte filler; /* filler byte for pixel expansion */
1274 #else
1275 png_uint_16 filler; /* filler bytes for pixel expansion */
1276 #endif
1277 #endif
1278
1279 #if defined(PNG_bKGD_SUPPORTED)
1280 png_byte background_gamma_type;
1281 # ifdef PNG_FLOATING_POINT_SUPPORTED
1282 float background_gamma;
1283 # endif
1284 png_color_16 background; /* background color in screen gamma space */
1285 #if defined(PNG_READ_GAMMA_SUPPORTED)
1286 png_color_16 background_1; /* background normalized to gamma 1.0 */
1287 #endif
1288 #endif /* PNG_bKGD_SUPPORTED */
1289
1290 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1291 png_flush_ptr output_flush_fn;/* Function for flushing output */
1292 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1293 png_uint_32 flush_rows; /* number of rows written since last flush */
1294 #endif
1295
1296 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1297 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1298 #ifdef PNG_FLOATING_POINT_SUPPORTED
1299 float gamma; /* file gamma value */
1300 float screen_gamma; /* screen gamma value (display_exponent) */
1301 #endif
1302 #endif
1303
1304 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1305 png_bytep gamma_table; /* gamma table for 8-bit depth files */
1306 png_bytep gamma_from_1; /* converts from 1.0 to screen */
1307 png_bytep gamma_to_1; /* converts from file to 1.0 */
1308 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1309 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1310 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1311 #endif
1312
1313 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1314 png_color_8 sig_bit; /* significant bits in each available channel */
1315 #endif
1316
1317 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1318 png_color_8 shift; /* shift for significant bit tranformation */
1319 #endif
1320
1321 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1322 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1323 png_bytep trans; /* transparency values for paletted files */
1324 png_color_16 trans_values; /* transparency values for non-paletted files */
1325 #endif
1326
1327 png_read_status_ptr read_row_fn; /* called after each row is decoded */
1328 png_write_status_ptr write_row_fn; /* called after each row is encoded */
1329 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1330 png_progressive_info_ptr info_fn; /* called after header data fully read */
1331 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1332 png_progressive_end_ptr end_fn; /* called after image is complete */
1333 png_bytep save_buffer_ptr; /* current location in save_buffer */
1334 png_bytep save_buffer; /* buffer for previously read data */
1335 png_bytep current_buffer_ptr; /* current location in current_buffer */
1336 png_bytep current_buffer; /* buffer for recently used data */
1337 png_uint_32 push_length; /* size of current input chunk */
1338 png_uint_32 skip_length; /* bytes to skip in input data */
1339 png_size_t save_buffer_size; /* amount of data now in save_buffer */
1340 png_size_t save_buffer_max; /* total size of save_buffer */
1341 png_size_t buffer_size; /* total amount of available input data */
1342 png_size_t current_buffer_size; /* amount of data now in current_buffer */
1343 int process_mode; /* what push library is currently doing */
1344 int cur_palette; /* current push library palette index */
1345
1346 # if defined(PNG_TEXT_SUPPORTED)
1347 png_size_t current_text_size; /* current size of text input data */
1348 png_size_t current_text_left; /* how much text left to read in input */
1349 png_charp current_text; /* current text chunk buffer */
1350 png_charp current_text_ptr; /* current location in current_text */
1351 # endif /* PNG_TEXT_SUPPORTED */
1352 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1353
1354 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1355 /* for the Borland special 64K segment handler */
1356 png_bytepp offset_table_ptr;
1357 png_bytep offset_table;
1358 png_uint_16 offset_table_number;
1359 png_uint_16 offset_table_count;
1360 png_uint_16 offset_table_count_free;
1361 #endif
1362
1363 #if defined(PNG_READ_DITHER_SUPPORTED)
1364 png_bytep palette_lookup; /* lookup table for dithering */
1365 png_bytep dither_index; /* index translation for palette files */
1366 #endif
1367
1368 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1369 png_uint_16p hist; /* histogram */
1370 #endif
1371
1372 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1373 png_byte heuristic_method; /* heuristic for row filter selection */
1374 png_byte num_prev_filters; /* number of weights for previous rows */
1375 png_bytep prev_filters; /* filter type(s) of previous row(s) */
1376 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1377 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1378 png_uint_16p filter_costs; /* relative filter calculation cost */
1379 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1380 #endif
1381
1382 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1383 png_charp time_buffer; /* String to hold RFC 1123 time text */
1384 #endif
1385
1386 /* New members added in libpng-1.0.6 */
1387
1388 #ifdef PNG_FREE_ME_SUPPORTED
1389 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1390 #endif
1391
1392 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1393 png_voidp user_chunk_ptr;
1394 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1395 #endif
1396
1397 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1398 int num_chunk_list;
1399 png_bytep chunk_list;
1400 #endif
1401
1402 /* New members added in libpng-1.0.3 */
1403 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1404 png_byte rgb_to_gray_status;
1405 /* These were changed from png_byte in libpng-1.0.6 */
1406 png_uint_16 rgb_to_gray_red_coeff;
1407 png_uint_16 rgb_to_gray_green_coeff;
1408 png_uint_16 rgb_to_gray_blue_coeff;
1409 #endif
1410
1411 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1412 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1413 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1414 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1415 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1416 #ifdef PNG_1_0_X
1417 png_byte mng_features_permitted;
1418 #else
1419 png_uint_32 mng_features_permitted;
1420 #endif /* PNG_1_0_X */
1421 #endif
1422
1423 /* New member added in libpng-1.0.7 */
1424 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1425 png_fixed_point int_gamma;
1426 #endif
1427
1428 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1429 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1430 png_byte filter_type;
1431 #endif
1432
1433 #if defined(PNG_1_0_X)
1434 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1435 png_uint_32 row_buf_size;
1436 #endif
1437
1438 /* New members added in libpng-1.2.0 */
1439 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1440 # if !defined(PNG_1_0_X)
1441 # if defined(PNG_MMX_CODE_SUPPORTED)
1442 png_byte mmx_bitdepth_threshold;
1443 png_uint_32 mmx_rowbytes_threshold;
1444 # endif
1445 png_uint_32 asm_flags;
1446 # endif
1447 #endif
1448
1449 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1450 #ifdef PNG_USER_MEM_SUPPORTED
1451 png_voidp mem_ptr; /* user supplied struct for mem functions */
1452 png_malloc_ptr malloc_fn; /* function for allocating memory */
1453 png_free_ptr free_fn; /* function for freeing memory */
1454 #endif
1455
1456 /* New member added in libpng-1.0.13 and 1.2.0 */
1457 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1458
1459 #if defined(PNG_READ_DITHER_SUPPORTED)
1460 /* The following three members were added at version 1.0.14 and 1.2.4 */
1461 png_bytep dither_sort; /* working sort array */
1462 png_bytep index_to_palette; /* where the original index currently is */
1463 /* in the palette */
1464 png_bytep palette_to_index; /* which original index points to this */
1465 /* palette color */
1466 #endif
1467
1468 /* New members added in libpng-1.0.16 and 1.2.6 */
1469 png_byte compression_type;
1470
1471 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1472 png_uint_32 user_width_max;
1473 png_uint_32 user_height_max;
1474 #endif
1475
1476 /* New member added in libpng-1.0.25 and 1.2.17 */
1477 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1478 /* storage for unknown chunk that the library doesn't recognize. */
1479 png_unknown_chunk unknown_chunk;
1480 #endif
1481
1482 /* New members added in libpng-1.2.26 */
1483 png_uint_32 old_big_row_buf_size, old_prev_row_size;
1484
1485 /* New member added in libpng-1.2.30 */
1486 png_charp chunkdata; /* buffer for reading chunk data */
1487
1488 };
1489
1490
1491 /* This triggers a compiler error in png.c, if png.c and png.h
1492 * do not agree upon the version number.
1493 */
1494 typedef png_structp version_1_2_36;
1495
1496 typedef png_struct FAR * FAR * png_structpp;
1497
1498 /* Here are the function definitions most commonly used. This is not
1499 * the place to find out how to use libpng. See libpng.txt for the
1500 * full explanation, see example.c for the summary. This just provides
1501 * a simple one line description of the use of each function.
1502 */
1503
1504 /* Returns the version number of the library */
1505 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1506
1507 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1508 * Handling more than 8 bytes from the beginning of the file is an error.
1509 */
1510 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1511 int num_bytes));
1512
1513 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1514 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1515 * signature, and non-zero otherwise. Having num_to_check == 0 or
1516 * start > 7 will always fail (ie return non-zero).
1517 */
1518 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1519 png_size_t num_to_check));
1520
1521 /* Simple signature checking function. This is the same as calling
1522 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1523 */
1524 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1525
1526 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1527 extern PNG_EXPORT(png_structp,png_create_read_struct)
1528 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1529 png_error_ptr error_fn, png_error_ptr warn_fn));
1530
1531 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1532 extern PNG_EXPORT(png_structp,png_create_write_struct)
1533 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1534 png_error_ptr error_fn, png_error_ptr warn_fn));
1535
1536 #ifdef PNG_WRITE_SUPPORTED
1537 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1538 PNGARG((png_structp png_ptr));
1539 #endif
1540
1541 #ifdef PNG_WRITE_SUPPORTED
1542 extern PNG_EXPORT(void,png_set_compression_buffer_size)
1543 PNGARG((png_structp png_ptr, png_uint_32 size));
1544 #endif
1545
1546 /* Reset the compression stream */
1547 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1548
1549 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1550 #ifdef PNG_USER_MEM_SUPPORTED
1551 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1552 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1553 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1554 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1555 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1556 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1557 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1558 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1559 #endif
1560
1561 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1562 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1563 png_bytep chunk_name, png_bytep data, png_size_t length));
1564
1565 /* Write the start of a PNG chunk - length and chunk name. */
1566 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1567 png_bytep chunk_name, png_uint_32 length));
1568
1569 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1570 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1571 png_bytep data, png_size_t length));
1572
1573 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1574 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1575
1576 /* Allocate and initialize the info structure */
1577 extern PNG_EXPORT(png_infop,png_create_info_struct)
1578 PNGARG((png_structp png_ptr));
1579
1580 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1581 /* Initialize the info structure (old interface - DEPRECATED) */
1582 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1583 #undef png_info_init
1584 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1585 png_sizeof(png_info));
1586 #endif
1587
1588 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1589 png_size_t png_info_struct_size));
1590
1591 /* Writes all the PNG information before the image. */
1592 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1593 png_infop info_ptr));
1594 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1595 png_infop info_ptr));
1596
1597 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1598 /* read the information before the actual image data. */
1599 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1600 png_infop info_ptr));
1601 #endif
1602
1603 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1604 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1605 PNGARG((png_structp png_ptr, png_timep ptime));
1606 #endif
1607
1608 #if !defined(_WIN32_WCE)
1609 /* "time.h" functions are not supported on WindowsCE */
1610 #if defined(PNG_WRITE_tIME_SUPPORTED)
1611 /* convert from a struct tm to png_time */
1612 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1613 struct tm FAR * ttime));
1614
1615 /* convert from time_t to png_time. Uses gmtime() */
1616 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1617 time_t ttime));
1618 #endif /* PNG_WRITE_tIME_SUPPORTED */
1619 #endif /* _WIN32_WCE */
1620
1621 #if defined(PNG_READ_EXPAND_SUPPORTED)
1622 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1623 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1624 #if !defined(PNG_1_0_X)
1625 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1626 png_ptr));
1627 #endif
1628 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1629 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1630 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1631 /* Deprecated */
1632 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1633 #endif
1634 #endif
1635
1636 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1637 /* Use blue, green, red order for pixels. */
1638 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1639 #endif
1640
1641 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1642 /* Expand the grayscale to 24-bit RGB if necessary. */
1643 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1644 #endif
1645
1646 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1647 /* Reduce RGB to grayscale. */
1648 #ifdef PNG_FLOATING_POINT_SUPPORTED
1649 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1650 int error_action, double red, double green ));
1651 #endif
1652 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1653 int error_action, png_fixed_point red, png_fixed_point green ));
1654 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1655 png_ptr));
1656 #endif
1657
1658 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1659 png_colorp palette));
1660
1661 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1662 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1663 #endif
1664
1665 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1666 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1667 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1668 #endif
1669
1670 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1671 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1672 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1673 #endif
1674
1675 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1676 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1677 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1678 png_uint_32 filler, int flags));
1679 /* The values of the PNG_FILLER_ defines should NOT be changed */
1680 #define PNG_FILLER_BEFORE 0
1681 #define PNG_FILLER_AFTER 1
1682 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1683 #if !defined(PNG_1_0_X)
1684 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1685 png_uint_32 filler, int flags));
1686 #endif
1687 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1688
1689 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1690 /* Swap bytes in 16-bit depth files. */
1691 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1692 #endif
1693
1694 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1695 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1696 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1697 #endif
1698
1699 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1700 /* Swap packing order of pixels in bytes. */
1701 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1702 #endif
1703
1704 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1705 /* Converts files to legal bit depths. */
1706 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1707 png_color_8p true_bits));
1708 #endif
1709
1710 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1711 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1712 /* Have the code handle the interlacing. Returns the number of passes. */
1713 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1714 #endif
1715
1716 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1717 /* Invert monochrome files */
1718 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1719 #endif
1720
1721 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1722 /* Handle alpha and tRNS by replacing with a background color. */
1723 #ifdef PNG_FLOATING_POINT_SUPPORTED
1724 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1725 png_color_16p background_color, int background_gamma_code,
1726 int need_expand, double background_gamma));
1727 #endif
1728 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1729 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1730 #define PNG_BACKGROUND_GAMMA_FILE 2
1731 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1732 #endif
1733
1734 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1735 /* strip the second byte of information from a 16-bit depth file. */
1736 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1737 #endif
1738
1739 #if defined(PNG_READ_DITHER_SUPPORTED)
1740 /* Turn on dithering, and reduce the palette to the number of colors available. */
1741 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1742 png_colorp palette, int num_palette, int maximum_colors,
1743 png_uint_16p histogram, int full_dither));
1744 #endif
1745
1746 #if defined(PNG_READ_GAMMA_SUPPORTED)
1747 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1748 #ifdef PNG_FLOATING_POINT_SUPPORTED
1749 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1750 double screen_gamma, double default_file_gamma));
1751 #endif
1752 #endif
1753
1754 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1755 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1756 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1757 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1758 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1759 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1760 int empty_plte_permitted));
1761 #endif
1762 #endif
1763
1764 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1765 /* Set how many lines between output flushes - 0 for no flushing */
1766 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1767 /* Flush the current PNG output buffer */
1768 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1769 #endif
1770
1771 /* optional update palette with requested transformations */
1772 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1773
1774 /* optional call to update the users info structure */
1775 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1776 png_infop info_ptr));
1777
1778 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1779 /* read one or more rows of image data. */
1780 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1781 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1782 #endif
1783
1784 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1785 /* read a row of data. */
1786 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1787 png_bytep row,
1788 png_bytep display_row));
1789 #endif
1790
1791 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1792 /* read the whole image into memory at once. */
1793 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1794 png_bytepp image));
1795 #endif
1796
1797 /* write a row of image data */
1798 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1799 png_bytep row));
1800
1801 /* write a few rows of image data */
1802 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1803 png_bytepp row, png_uint_32 num_rows));
1804
1805 /* write the image data */
1806 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1807 png_bytepp image));
1808
1809 /* writes the end of the PNG file. */
1810 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1811 png_infop info_ptr));
1812
1813 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1814 /* read the end of the PNG file. */
1815 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1816 png_infop info_ptr));
1817 #endif
1818
1819 /* free any memory associated with the png_info_struct */
1820 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1821 png_infopp info_ptr_ptr));
1822
1823 /* free any memory associated with the png_struct and the png_info_structs */
1824 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1825 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1826
1827 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1828 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1829 png_infop end_info_ptr));
1830
1831 /* free any memory associated with the png_struct and the png_info_structs */
1832 extern PNG_EXPORT(void,png_destroy_write_struct)
1833 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1834
1835 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1836 extern void png_write_destroy PNGARG((png_structp png_ptr));
1837
1838 /* set the libpng method of handling chunk CRC errors */
1839 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1840 int crit_action, int ancil_action));
1841
1842 /* Values for png_set_crc_action() to say how to handle CRC errors in
1843 * ancillary and critical chunks, and whether to use the data contained
1844 * therein. Note that it is impossible to "discard" data in a critical
1845 * chunk. For versions prior to 0.90, the action was always error/quit,
1846 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1847 * chunks is warn/discard. These values should NOT be changed.
1848 *
1849 * value action:critical action:ancillary
1850 */
1851 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1852 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1853 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1854 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1855 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1856 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1857
1858 /* These functions give the user control over the scan-line filtering in
1859 * libpng and the compression methods used by zlib. These functions are
1860 * mainly useful for testing, as the defaults should work with most users.
1861 * Those users who are tight on memory or want faster performance at the
1862 * expense of compression can modify them. See the compression library
1863 * header file (zlib.h) for an explination of the compression functions.
1864 */
1865
1866 /* set the filtering method(s) used by libpng. Currently, the only valid
1867 * value for "method" is 0.
1868 */
1869 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1870 int filters));
1871
1872 /* Flags for png_set_filter() to say which filters to use. The flags
1873 * are chosen so that they don't conflict with real filter types
1874 * below, in case they are supplied instead of the #defined constants.
1875 * These values should NOT be changed.
1876 */
1877 #define PNG_NO_FILTERS 0x00
1878 #define PNG_FILTER_NONE 0x08
1879 #define PNG_FILTER_SUB 0x10
1880 #define PNG_FILTER_UP 0x20
1881 #define PNG_FILTER_AVG 0x40
1882 #define PNG_FILTER_PAETH 0x80
1883 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1884 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1885
1886 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1887 * These defines should NOT be changed.
1888 */
1889 #define PNG_FILTER_VALUE_NONE 0
1890 #define PNG_FILTER_VALUE_SUB 1
1891 #define PNG_FILTER_VALUE_UP 2
1892 #define PNG_FILTER_VALUE_AVG 3
1893 #define PNG_FILTER_VALUE_PAETH 4
1894 #define PNG_FILTER_VALUE_LAST 5
1895
1896 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1897 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1898 * defines, either the default (minimum-sum-of-absolute-differences), or
1899 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1900 *
1901 * Weights are factors >= 1.0, indicating how important it is to keep the
1902 * filter type consistent between rows. Larger numbers mean the current
1903 * filter is that many times as likely to be the same as the "num_weights"
1904 * previous filters. This is cumulative for each previous row with a weight.
1905 * There needs to be "num_weights" values in "filter_weights", or it can be
1906 * NULL if the weights aren't being specified. Weights have no influence on
1907 * the selection of the first row filter. Well chosen weights can (in theory)
1908 * improve the compression for a given image.
1909 *
1910 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1911 * filter type. Higher costs indicate more decoding expense, and are
1912 * therefore less likely to be selected over a filter with lower computational
1913 * costs. There needs to be a value in "filter_costs" for each valid filter
1914 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1915 * setting the costs. Costs try to improve the speed of decompression without
1916 * unduly increasing the compressed image size.
1917 *
1918 * A negative weight or cost indicates the default value is to be used, and
1919 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1920 * The default values for both weights and costs are currently 1.0, but may
1921 * change if good general weighting/cost heuristics can be found. If both
1922 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1923 * to the UNWEIGHTED method, but with added encoding time/computation.
1924 */
1925 #ifdef PNG_FLOATING_POINT_SUPPORTED
1926 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1927 int heuristic_method, int num_weights, png_doublep filter_weights,
1928 png_doublep filter_costs));
1929 #endif
1930 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1931
1932 /* Heuristic used for row filter selection. These defines should NOT be
1933 * changed.
1934 */
1935 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1936 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1937 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1938 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1939
1940 /* Set the library compression level. Currently, valid values range from
1941 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1942 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1943 * shown that zlib compression levels 3-6 usually perform as well as level 9
1944 * for PNG images, and do considerably fewer caclulations. In the future,
1945 * these values may not correspond directly to the zlib compression levels.
1946 */
1947 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1948 int level));
1949
1950 extern PNG_EXPORT(void,png_set_compression_mem_level)
1951 PNGARG((png_structp png_ptr, int mem_level));
1952
1953 extern PNG_EXPORT(void,png_set_compression_strategy)
1954 PNGARG((png_structp png_ptr, int strategy));
1955
1956 extern PNG_EXPORT(void,png_set_compression_window_bits)
1957 PNGARG((png_structp png_ptr, int window_bits));
1958
1959 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1960 int method));
1961
1962 /* These next functions are called for input/output, memory, and error
1963 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1964 * and call standard C I/O routines such as fread(), fwrite(), and
1965 * fprintf(). These functions can be made to use other I/O routines
1966 * at run time for those applications that need to handle I/O in a
1967 * different manner by calling png_set_???_fn(). See libpng.txt for
1968 * more information.
1969 */
1970
1971 #if !defined(PNG_NO_STDIO)
1972 /* Initialize the input/output for the PNG file to the default functions. */
1973 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1974 #endif
1975
1976 /* Replace the (error and abort), and warning functions with user
1977 * supplied functions. If no messages are to be printed you must still
1978 * write and use replacement functions. The replacement error_fn should
1979 * still do a longjmp to the last setjmp location if you are using this
1980 * method of error handling. If error_fn or warning_fn is NULL, the
1981 * default function will be used.
1982 */
1983
1984 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1985 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1986
1987 /* Return the user pointer associated with the error functions */
1988 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1989
1990 /* Replace the default data output functions with a user supplied one(s).
1991 * If buffered output is not used, then output_flush_fn can be set to NULL.
1992 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1993 * output_flush_fn will be ignored (and thus can be NULL).
1994 * It is probably a mistake to use NULL for output_flush_fn if
1995 * write_data_fn is not also NULL unless you have built libpng with
1996 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
1997 * default flush function, which uses the standard *FILE structure, will
1998 * be used.
1999 */
2000 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
2001 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
2002
2003 /* Replace the default data input function with a user supplied one. */
2004 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
2005 png_voidp io_ptr, png_rw_ptr read_data_fn));
2006
2007 /* Return the user pointer associated with the I/O functions */
2008 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
2009
2010 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
2011 png_read_status_ptr read_row_fn));
2012
2013 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
2014 png_write_status_ptr write_row_fn));
2015
2016 #ifdef PNG_USER_MEM_SUPPORTED
2017 /* Replace the default memory allocation functions with user supplied one(s). */
2018 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
2019 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
2020 /* Return the user pointer associated with the memory functions */
2021 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
2022 #endif
2023
2024 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2025 defined(PNG_LEGACY_SUPPORTED)
2026 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
2027 png_ptr, png_user_transform_ptr read_user_transform_fn));
2028 #endif
2029
2030 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2031 defined(PNG_LEGACY_SUPPORTED)
2032 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
2033 png_ptr, png_user_transform_ptr write_user_transform_fn));
2034 #endif
2035
2036 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2037 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2038 defined(PNG_LEGACY_SUPPORTED)
2039 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
2040 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
2041 int user_transform_channels));
2042 /* Return the user pointer associated with the user transform functions */
2043 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
2044 PNGARG((png_structp png_ptr));
2045 #endif
2046
2047 #ifdef PNG_USER_CHUNKS_SUPPORTED
2048 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2049 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2050 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2051 png_ptr));
2052 #endif
2053
2054 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2055 /* Sets the function callbacks for the push reader, and a pointer to a
2056 * user-defined structure available to the callback functions.
2057 */
2058 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2059 png_voidp progressive_ptr,
2060 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2061 png_progressive_end_ptr end_fn));
2062
2063 /* returns the user pointer associated with the push read functions */
2064 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2065 PNGARG((png_structp png_ptr));
2066
2067 /* function to be called when data becomes available */
2068 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2069 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2070
2071 /* function that combines rows. Not very much different than the
2072 * png_combine_row() call. Is this even used?????
2073 */
2074 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2075 png_bytep old_row, png_bytep new_row));
2076 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2077
2078 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2079 png_uint_32 size));
2080
2081 #if defined(PNG_1_0_X)
2082 # define png_malloc_warn png_malloc
2083 #else
2084 /* Added at libpng version 1.2.4 */
2085 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2086 png_uint_32 size));
2087 #endif
2088
2089 /* frees a pointer allocated by png_malloc() */
2090 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2091
2092 #if defined(PNG_1_0_X)
2093 /* Function to allocate memory for zlib. */
2094 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2095 uInt size));
2096
2097 /* Function to free memory for zlib */
2098 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2099 #endif
2100
2101 /* Free data that was allocated internally */
2102 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2103 png_infop info_ptr, png_uint_32 free_me, int num));
2104 #ifdef PNG_FREE_ME_SUPPORTED
2105 /* Reassign responsibility for freeing existing data, whether allocated
2106 * by libpng or by the application */
2107 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2108 png_infop info_ptr, int freer, png_uint_32 mask));
2109 #endif
2110 /* assignments for png_data_freer */
2111 #define PNG_DESTROY_WILL_FREE_DATA 1
2112 #define PNG_SET_WILL_FREE_DATA 1
2113 #define PNG_USER_WILL_FREE_DATA 2
2114 /* Flags for png_ptr->free_me and info_ptr->free_me */
2115 #define PNG_FREE_HIST 0x0008
2116 #define PNG_FREE_ICCP 0x0010
2117 #define PNG_FREE_SPLT 0x0020
2118 #define PNG_FREE_ROWS 0x0040
2119 #define PNG_FREE_PCAL 0x0080
2120 #define PNG_FREE_SCAL 0x0100
2121 #define PNG_FREE_UNKN 0x0200
2122 #define PNG_FREE_LIST 0x0400
2123 #define PNG_FREE_PLTE 0x1000
2124 #define PNG_FREE_TRNS 0x2000
2125 #define PNG_FREE_TEXT 0x4000
2126 #define PNG_FREE_ALL 0x7fff
2127 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2128
2129 #ifdef PNG_USER_MEM_SUPPORTED
2130 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2131 png_uint_32 size));
2132 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2133 png_voidp ptr));
2134 #endif
2135
2136 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2137 png_voidp s1, png_voidp s2, png_uint_32 size));
2138
2139 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2140 png_voidp s1, int value, png_uint_32 size));
2141
2142 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2143 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2144 int check));
2145 #endif /* USE_FAR_KEYWORD */
2146
2147 #ifndef PNG_NO_ERROR_TEXT
2148 /* Fatal error in PNG image of libpng - can't continue */
2149 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2150 png_const_charp error_message));
2151
2152 /* The same, but the chunk name is prepended to the error string. */
2153 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2154 png_const_charp error_message));
2155 #else
2156 /* Fatal error in PNG image of libpng - can't continue */
2157 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
2158 #endif
2159
2160 #ifndef PNG_NO_WARNINGS
2161 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2162 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2163 png_const_charp warning_message));
2164
2165 #ifdef PNG_READ_SUPPORTED
2166 /* Non-fatal error in libpng, chunk name is prepended to message. */
2167 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2168 png_const_charp warning_message));
2169 #endif /* PNG_READ_SUPPORTED */
2170 #endif /* PNG_NO_WARNINGS */
2171
2172 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2173 * Similarly, the png_get_<chunk> calls are used to read values from the
2174 * png_info_struct, either storing the parameters in the passed variables, or
2175 * setting pointers into the png_info_struct where the data is stored. The
2176 * png_get_<chunk> functions return a non-zero value if the data was available
2177 * in info_ptr, or return zero and do not change any of the parameters if the
2178 * data was not available.
2179 *
2180 * These functions should be used instead of directly accessing png_info
2181 * to avoid problems with future changes in the size and internal layout of
2182 * png_info_struct.
2183 */
2184 /* Returns "flag" if chunk data is valid in info_ptr. */
2185 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2186 png_infop info_ptr, png_uint_32 flag));
2187
2188 /* Returns number of bytes needed to hold a transformed row. */
2189 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2190 png_infop info_ptr));
2191
2192 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2193 /* Returns row_pointers, which is an array of pointers to scanlines that was
2194 returned from png_read_png(). */
2195 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2196 png_infop info_ptr));
2197 /* Set row_pointers, which is an array of pointers to scanlines for use
2198 by png_write_png(). */
2199 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2200 png_infop info_ptr, png_bytepp row_pointers));
2201 #endif
2202
2203 /* Returns number of color channels in image. */
2204 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2205 png_infop info_ptr));
2206
2207 #ifdef PNG_EASY_ACCESS_SUPPORTED
2208 /* Returns image width in pixels. */
2209 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2210 png_ptr, png_infop info_ptr));
2211
2212 /* Returns image height in pixels. */
2213 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2214 png_ptr, png_infop info_ptr));
2215
2216 /* Returns image bit_depth. */
2217 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2218 png_ptr, png_infop info_ptr));
2219
2220 /* Returns image color_type. */
2221 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2222 png_ptr, png_infop info_ptr));
2223
2224 /* Returns image filter_type. */
2225 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2226 png_ptr, png_infop info_ptr));
2227
2228 /* Returns image interlace_type. */
2229 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2230 png_ptr, png_infop info_ptr));
2231
2232 /* Returns image compression_type. */
2233 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2234 png_ptr, png_infop info_ptr));
2235
2236 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2237 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2238 png_ptr, png_infop info_ptr));
2239 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2240 png_ptr, png_infop info_ptr));
2241 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2242 png_ptr, png_infop info_ptr));
2243
2244 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2245 #ifdef PNG_FLOATING_POINT_SUPPORTED
2246 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2247 png_ptr, png_infop info_ptr));
2248 #endif
2249
2250 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2251 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2252 png_ptr, png_infop info_ptr));
2253 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2254 png_ptr, png_infop info_ptr));
2255 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2256 png_ptr, png_infop info_ptr));
2257 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2258 png_ptr, png_infop info_ptr));
2259
2260 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2261
2262 /* Returns pointer to signature string read from PNG header */
2263 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2264 png_infop info_ptr));
2265
2266 #if defined(PNG_bKGD_SUPPORTED)
2267 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2268 png_infop info_ptr, png_color_16p *background));
2269 #endif
2270
2271 #if defined(PNG_bKGD_SUPPORTED)
2272 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2273 png_infop info_ptr, png_color_16p background));
2274 #endif
2275
2276 #if defined(PNG_cHRM_SUPPORTED)
2277 #ifdef PNG_FLOATING_POINT_SUPPORTED
2278 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2279 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2280 double *red_y, double *green_x, double *green_y, double *blue_x,
2281 double *blue_y));
2282 #endif
2283 #ifdef PNG_FIXED_POINT_SUPPORTED
2284 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2285 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2286 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2287 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2288 *int_blue_x, png_fixed_point *int_blue_y));
2289 #endif
2290 #endif
2291
2292 #if defined(PNG_cHRM_SUPPORTED)
2293 #ifdef PNG_FLOATING_POINT_SUPPORTED
2294 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2295 png_infop info_ptr, double white_x, double white_y, double red_x,
2296 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2297 #endif
2298 #ifdef PNG_FIXED_POINT_SUPPORTED
2299 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2300 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2301 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2302 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2303 png_fixed_point int_blue_y));
2304 #endif
2305 #endif
2306
2307 #if defined(PNG_gAMA_SUPPORTED)
2308 #ifdef PNG_FLOATING_POINT_SUPPORTED
2309 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2310 png_infop info_ptr, double *file_gamma));
2311 #endif
2312 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2313 png_infop info_ptr, png_fixed_point *int_file_gamma));
2314 #endif
2315
2316 #if defined(PNG_gAMA_SUPPORTED)
2317 #ifdef PNG_FLOATING_POINT_SUPPORTED
2318 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2319 png_infop info_ptr, double file_gamma));
2320 #endif
2321 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2322 png_infop info_ptr, png_fixed_point int_file_gamma));
2323 #endif
2324
2325 #if defined(PNG_hIST_SUPPORTED)
2326 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2327 png_infop info_ptr, png_uint_16p *hist));
2328 #endif
2329
2330 #if defined(PNG_hIST_SUPPORTED)
2331 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2332 png_infop info_ptr, png_uint_16p hist));
2333 #endif
2334
2335 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2336 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2337 int *bit_depth, int *color_type, int *interlace_method,
2338 int *compression_method, int *filter_method));
2339
2340 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2341 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2342 int color_type, int interlace_method, int compression_method,
2343 int filter_method));
2344
2345 #if defined(PNG_oFFs_SUPPORTED)
2346 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2347 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2348 int *unit_type));
2349 #endif
2350
2351 #if defined(PNG_oFFs_SUPPORTED)
2352 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2353 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2354 int unit_type));
2355 #endif
2356
2357 #if defined(PNG_pCAL_SUPPORTED)
2358 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2359 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2360 int *type, int *nparams, png_charp *units, png_charpp *params));
2361 #endif
2362
2363 #if defined(PNG_pCAL_SUPPORTED)
2364 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2365 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2366 int type, int nparams, png_charp units, png_charpp params));
2367 #endif
2368
2369 #if defined(PNG_pHYs_SUPPORTED)
2370 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2371 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2372 #endif
2373
2374 #if defined(PNG_pHYs_SUPPORTED)
2375 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2376 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2377 #endif
2378
2379 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2380 png_infop info_ptr, png_colorp *palette, int *num_palette));
2381
2382 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2383 png_infop info_ptr, png_colorp palette, int num_palette));
2384
2385 #if defined(PNG_sBIT_SUPPORTED)
2386 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2387 png_infop info_ptr, png_color_8p *sig_bit));
2388 #endif
2389
2390 #if defined(PNG_sBIT_SUPPORTED)
2391 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2392 png_infop info_ptr, png_color_8p sig_bit));
2393 #endif
2394
2395 #if defined(PNG_sRGB_SUPPORTED)
2396 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2397 png_infop info_ptr, int *intent));
2398 #endif
2399
2400 #if defined(PNG_sRGB_SUPPORTED)
2401 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2402 png_infop info_ptr, int intent));
2403 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2404 png_infop info_ptr, int intent));
2405 #endif
2406
2407 #if defined(PNG_iCCP_SUPPORTED)
2408 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2409 png_infop info_ptr, png_charpp name, int *compression_type,
2410 png_charpp profile, png_uint_32 *proflen));
2411 /* Note to maintainer: profile should be png_bytepp */
2412 #endif
2413
2414 #if defined(PNG_iCCP_SUPPORTED)
2415 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2416 png_infop info_ptr, png_charp name, int compression_type,
2417 png_charp profile, png_uint_32 proflen));
2418 /* Note to maintainer: profile should be png_bytep */
2419 #endif
2420
2421 #if defined(PNG_sPLT_SUPPORTED)
2422 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2423 png_infop info_ptr, png_sPLT_tpp entries));
2424 #endif
2425
2426 #if defined(PNG_sPLT_SUPPORTED)
2427 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2428 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2429 #endif
2430
2431 #if defined(PNG_TEXT_SUPPORTED)
2432 /* png_get_text also returns the number of text chunks in *num_text */
2433 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2434 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2435 #endif
2436
2437 /*
2438 * Note while png_set_text() will accept a structure whose text,
2439 * language, and translated keywords are NULL pointers, the structure
2440 * returned by png_get_text will always contain regular
2441 * zero-terminated C strings. They might be empty strings but
2442 * they will never be NULL pointers.
2443 */
2444
2445 #if defined(PNG_TEXT_SUPPORTED)
2446 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2447 png_infop info_ptr, png_textp text_ptr, int num_text));
2448 #endif
2449
2450 #if defined(PNG_tIME_SUPPORTED)
2451 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2452 png_infop info_ptr, png_timep *mod_time));
2453 #endif
2454
2455 #if defined(PNG_tIME_SUPPORTED)
2456 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2457 png_infop info_ptr, png_timep mod_time));
2458 #endif
2459
2460 #if defined(PNG_tRNS_SUPPORTED)
2461 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2462 png_infop info_ptr, png_bytep *trans, int *num_trans,
2463 png_color_16p *trans_values));
2464 #endif
2465
2466 #if defined(PNG_tRNS_SUPPORTED)
2467 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2468 png_infop info_ptr, png_bytep trans, int num_trans,
2469 png_color_16p trans_values));
2470 #endif
2471
2472 #if defined(PNG_tRNS_SUPPORTED)
2473 #endif
2474
2475 #if defined(PNG_sCAL_SUPPORTED)
2476 #ifdef PNG_FLOATING_POINT_SUPPORTED
2477 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2478 png_infop info_ptr, int *unit, double *width, double *height));
2479 #else
2480 #ifdef PNG_FIXED_POINT_SUPPORTED
2481 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2482 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2483 #endif
2484 #endif
2485 #endif /* PNG_sCAL_SUPPORTED */
2486
2487 #if defined(PNG_sCAL_SUPPORTED)
2488 #ifdef PNG_FLOATING_POINT_SUPPORTED
2489 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2490 png_infop info_ptr, int unit, double width, double height));
2491 #else
2492 #ifdef PNG_FIXED_POINT_SUPPORTED
2493 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2494 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2495 #endif
2496 #endif
2497 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2498
2499 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2500 /* provide a list of chunks and how they are to be handled, if the built-in
2501 handling or default unknown chunk handling is not desired. Any chunks not
2502 listed will be handled in the default manner. The IHDR and IEND chunks
2503 must not be listed.
2504 keep = 0: follow default behaviour
2505 = 1: do not keep
2506 = 2: keep only if safe-to-copy
2507 = 3: keep even if unsafe-to-copy
2508 */
2509 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2510 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2511 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2512 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2513 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2514 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2515 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2516 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2517 #endif
2518 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2519 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2520 chunk_name));
2521 #endif
2522
2523 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2524 If you need to turn it off for a chunk that your application has freed,
2525 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2526 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2527 png_infop info_ptr, int mask));
2528
2529 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2530 /* The "params" pointer is currently not used and is for future expansion. */
2531 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2532 png_infop info_ptr,
2533 int transforms,
2534 png_voidp params));
2535 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2536 png_infop info_ptr,
2537 int transforms,
2538 png_voidp params));
2539 #endif
2540
2541 /* Define PNG_DEBUG at compile time for debugging information. Higher
2542 * numbers for PNG_DEBUG mean more debugging information. This has
2543 * only been added since version 0.95 so it is not implemented throughout
2544 * libpng yet, but more support will be added as needed.
2545 */
2546 #ifdef PNG_DEBUG
2547 #if (PNG_DEBUG > 0)
2548 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2549 #include <crtdbg.h>
2550 #if (PNG_DEBUG > 1)
2551 #ifndef _DEBUG
2552 # define _DEBUG
2553 #endif
2554 #ifndef png_debug
2555 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
2556 #endif
2557 #ifndef png_debug1
2558 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
2559 #endif
2560 #ifndef png_debug2
2561 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
2562 #endif
2563 #endif
2564 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2565 #ifndef PNG_DEBUG_FILE
2566 #define PNG_DEBUG_FILE stderr
2567 #endif /* PNG_DEBUG_FILE */
2568
2569 #if (PNG_DEBUG > 1)
2570 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
2571 * non-ISO compilers */
2572 # ifdef __STDC__
2573 # ifndef png_debug
2574 # define png_debug(l,m) \
2575 { \
2576 int num_tabs=l; \
2577 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2578 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2579 }
2580 # endif
2581 # ifndef png_debug1
2582 # define png_debug1(l,m,p1) \
2583 { \
2584 int num_tabs=l; \
2585 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2586 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2587 }
2588 # endif
2589 # ifndef png_debug2
2590 # define png_debug2(l,m,p1,p2) \
2591 { \
2592 int num_tabs=l; \
2593 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2594 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2595 }
2596 # endif
2597 # else /* __STDC __ */
2598 # ifndef png_debug
2599 # define png_debug(l,m) \
2600 { \
2601 int num_tabs=l; \
2602 char format[256]; \
2603 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2604 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2605 m,PNG_STRING_NEWLINE); \
2606 fprintf(PNG_DEBUG_FILE,format); \
2607 }
2608 # endif
2609 # ifndef png_debug1
2610 # define png_debug1(l,m,p1) \
2611 { \
2612 int num_tabs=l; \
2613 char format[256]; \
2614 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2615 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2616 m,PNG_STRING_NEWLINE); \
2617 fprintf(PNG_DEBUG_FILE,format,p1); \
2618 }
2619 # endif
2620 # ifndef png_debug2
2621 # define png_debug2(l,m,p1,p2) \
2622 { \
2623 int num_tabs=l; \
2624 char format[256]; \
2625 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2626 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2627 m,PNG_STRING_NEWLINE); \
2628 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
2629 }
2630 # endif
2631 # endif /* __STDC __ */
2632 #endif /* (PNG_DEBUG > 1) */
2633
2634 #endif /* _MSC_VER */
2635 #endif /* (PNG_DEBUG > 0) */
2636 #endif /* PNG_DEBUG */
2637 #ifndef png_debug
2638 #define png_debug(l, m)
2639 #endif
2640 #ifndef png_debug1
2641 #define png_debug1(l, m, p1)
2642 #endif
2643 #ifndef png_debug2
2644 #define png_debug2(l, m, p1, p2)
2645 #endif
2646
2647 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2648 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2649 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2650 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2651
2652 #ifdef PNG_MNG_FEATURES_SUPPORTED
2653 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2654 png_ptr, png_uint_32 mng_features_permitted));
2655 #endif
2656
2657 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2658 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2659 #define PNG_HANDLE_CHUNK_NEVER 1
2660 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2661 #define PNG_HANDLE_CHUNK_ALWAYS 3
2662
2663 /* Added to version 1.2.0 */
2664 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2665 #if defined(PNG_MMX_CODE_SUPPORTED)
2666 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2667 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2668 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2669 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2670 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2671 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2672 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2673 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2674 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2675
2676 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2677 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2678 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2679 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2680 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2681 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2682 #define PNG_MMX_WRITE_FLAGS ( 0 )
2683
2684 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2685 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2686 | PNG_MMX_READ_FLAGS \
2687 | PNG_MMX_WRITE_FLAGS )
2688
2689 #define PNG_SELECT_READ 1
2690 #define PNG_SELECT_WRITE 2
2691 #endif /* PNG_MMX_CODE_SUPPORTED */
2692
2693 #if !defined(PNG_1_0_X)
2694 /* pngget.c */
2695 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2696 PNGARG((int flag_select, int *compilerID));
2697
2698 /* pngget.c */
2699 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2700 PNGARG((int flag_select));
2701
2702 /* pngget.c */
2703 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2704 PNGARG((png_structp png_ptr));
2705
2706 /* pngget.c */
2707 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2708 PNGARG((png_structp png_ptr));
2709
2710 /* pngget.c */
2711 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2712 PNGARG((png_structp png_ptr));
2713
2714 /* pngset.c */
2715 extern PNG_EXPORT(void,png_set_asm_flags)
2716 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2717
2718 /* pngset.c */
2719 extern PNG_EXPORT(void,png_set_mmx_thresholds)
2720 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2721 png_uint_32 mmx_rowbytes_threshold));
2722
2723 #endif /* PNG_1_0_X */
2724
2725 #if !defined(PNG_1_0_X)
2726 /* png.c, pnggccrd.c, or pngvcrd.c */
2727 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2728 #endif /* PNG_1_0_X */
2729 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2730
2731 /* Strip the prepended error numbers ("#nnn ") from error and warning
2732 * messages before passing them to the error or warning handler. */
2733 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2734 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2735 png_ptr, png_uint_32 strip_mode));
2736 #endif
2737
2738 /* Added at libpng-1.2.6 */
2739 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2740 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2741 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2742 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2743 png_ptr));
2744 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2745 png_ptr));
2746 #endif
2747
2748
2749 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2750
2751 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2752 /* With these routines we avoid an integer divide, which will be slower on
2753 * most machines. However, it does take more operations than the corresponding
2754 * divide method, so it may be slower on a few RISC systems. There are two
2755 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2756 *
2757 * Note that the rounding factors are NOT supposed to be the same! 128 and
2758 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2759 * standard method.
2760 *
2761 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2762 */
2763
2764 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2765
2766 # define png_composite(composite, fg, alpha, bg) \
2767 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2768 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2769 (png_uint_16)(alpha)) + (png_uint_16)128); \
2770 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2771
2772 # define png_composite_16(composite, fg, alpha, bg) \
2773 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2774 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2775 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2776 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2777
2778 #else /* standard method using integer division */
2779
2780 # define png_composite(composite, fg, alpha, bg) \
2781 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2782 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2783 (png_uint_16)127) / 255)
2784
2785 # define png_composite_16(composite, fg, alpha, bg) \
2786 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2787 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2788 (png_uint_32)32767) / (png_uint_32)65535L)
2789
2790 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2791
2792 /* Inline macros to do direct reads of bytes from the input buffer. These
2793 * require that you are using an architecture that uses PNG byte ordering
2794 * (MSB first) and supports unaligned data storage. I think that PowerPC
2795 * in big-endian mode and 680x0 are the only ones that will support this.
2796 * The x86 line of processors definitely do not. The png_get_int_32()
2797 * routine also assumes we are using two's complement format for negative
2798 * values, which is almost certainly true.
2799 */
2800 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2801 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2802 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2803 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2804 #else
2805 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2806 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2807 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2808 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2809 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2810 PNGARG((png_structp png_ptr, png_bytep buf));
2811 /* No png_get_int_16 -- may be added if there's a real need for it. */
2812
2813 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2814 */
2815 extern PNG_EXPORT(void,png_save_uint_32)
2816 PNGARG((png_bytep buf, png_uint_32 i));
2817 extern PNG_EXPORT(void,png_save_int_32)
2818 PNGARG((png_bytep buf, png_int_32 i));
2819
2820 /* Place a 16-bit number into a buffer in PNG byte order.
2821 * The parameter is declared unsigned int, not png_uint_16,
2822 * just to avoid potential problems on pre-ANSI C compilers.
2823 */
2824 extern PNG_EXPORT(void,png_save_uint_16)
2825 PNGARG((png_bytep buf, unsigned int i));
2826 /* No png_save_int_16 -- may be added if there's a real need for it. */
2827
2828 /* ************************************************************************* */
2829
2830 /* These next functions are used internally in the code. They generally
2831 * shouldn't be used unless you are writing code to add or replace some
2832 * functionality in libpng. More information about most functions can
2833 * be found in the files where the functions are located.
2834 */
2835
2836
2837 /* Various modes of operation, that are visible to applications because
2838 * they are used for unknown chunk location.
2839 */
2840 #define PNG_HAVE_IHDR 0x01
2841 #define PNG_HAVE_PLTE 0x02
2842 #define PNG_HAVE_IDAT 0x04
2843 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2844 #define PNG_HAVE_IEND 0x10
2845
2846 #if defined(PNG_INTERNAL)
2847
2848 /* More modes of operation. Note that after an init, mode is set to
2849 * zero automatically when the structure is created.
2850 */
2851 #define PNG_HAVE_gAMA 0x20
2852 #define PNG_HAVE_cHRM 0x40
2853 #define PNG_HAVE_sRGB 0x80
2854 #define PNG_HAVE_CHUNK_HEADER 0x100
2855 #define PNG_WROTE_tIME 0x200
2856 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2857 #define PNG_BACKGROUND_IS_GRAY 0x800
2858 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2859 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2860
2861 /* flags for the transformations the PNG library does on the image data */
2862 #define PNG_BGR 0x0001
2863 #define PNG_INTERLACE 0x0002
2864 #define PNG_PACK 0x0004
2865 #define PNG_SHIFT 0x0008
2866 #define PNG_SWAP_BYTES 0x0010
2867 #define PNG_INVERT_MONO 0x0020
2868 #define PNG_DITHER 0x0040
2869 #define PNG_BACKGROUND 0x0080
2870 #define PNG_BACKGROUND_EXPAND 0x0100
2871 /* 0x0200 unused */
2872 #define PNG_16_TO_8 0x0400
2873 #define PNG_RGBA 0x0800
2874 #define PNG_EXPAND 0x1000
2875 #define PNG_GAMMA 0x2000
2876 #define PNG_GRAY_TO_RGB 0x4000
2877 #define PNG_FILLER 0x8000L
2878 #define PNG_PACKSWAP 0x10000L
2879 #define PNG_SWAP_ALPHA 0x20000L
2880 #define PNG_STRIP_ALPHA 0x40000L
2881 #define PNG_INVERT_ALPHA 0x80000L
2882 #define PNG_USER_TRANSFORM 0x100000L
2883 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2884 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2885 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2886 /* 0x800000L Unused */
2887 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2888 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2889 /* 0x4000000L unused */
2890 /* 0x8000000L unused */
2891 /* 0x10000000L unused */
2892 /* 0x20000000L unused */
2893 /* 0x40000000L unused */
2894
2895 /* flags for png_create_struct */
2896 #define PNG_STRUCT_PNG 0x0001
2897 #define PNG_STRUCT_INFO 0x0002
2898
2899 /* Scaling factor for filter heuristic weighting calculations */
2900 #define PNG_WEIGHT_SHIFT 8
2901 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2902 #define PNG_COST_SHIFT 3
2903 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2904
2905 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2906 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2907 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2908 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2909 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2910 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2911 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2912 #define PNG_FLAG_ROW_INIT 0x0040
2913 #define PNG_FLAG_FILLER_AFTER 0x0080
2914 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2915 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2916 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2917 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2918 #define PNG_FLAG_FREE_PLTE 0x1000
2919 #define PNG_FLAG_FREE_TRNS 0x2000
2920 #define PNG_FLAG_FREE_HIST 0x4000
2921 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2922 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2923 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2924 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2925 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2926 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2927 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2928 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2929 /* 0x800000L unused */
2930 /* 0x1000000L unused */
2931 /* 0x2000000L unused */
2932 /* 0x4000000L unused */
2933 /* 0x8000000L unused */
2934 /* 0x10000000L unused */
2935 /* 0x20000000L unused */
2936 /* 0x40000000L unused */
2937
2938 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2939 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2940
2941 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2942 PNG_FLAG_CRC_CRITICAL_IGNORE)
2943
2944 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2945 PNG_FLAG_CRC_CRITICAL_MASK)
2946
2947 /* save typing and make code easier to understand */
2948
2949 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2950 abs((int)((c1).green) - (int)((c2).green)) + \
2951 abs((int)((c1).blue) - (int)((c2).blue)))
2952
2953 /* Added to libpng-1.2.6 JB */
2954 #define PNG_ROWBYTES(pixel_bits, width) \
2955 ((pixel_bits) >= 8 ? \
2956 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2957 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2958
2959 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2960 ideal-delta..ideal+delta. Each argument is evaluated twice.
2961 "ideal" and "delta" should be constants, normally simple
2962 integers, "value" a variable. Added to libpng-1.2.6 JB */
2963 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2964 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2965
2966 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2967 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2968 /* place to hold the signature string for a PNG file. */
2969 #ifdef PNG_USE_GLOBAL_ARRAYS
2970 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
2971 #else
2972 #endif
2973 #endif /* PNG_NO_EXTERN */
2974
2975 /* Constant strings for known chunk types. If you need to add a chunk,
2976 * define the name here, and add an invocation of the macro in png.c and
2977 * wherever it's needed.
2978 */
2979 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2980 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2981 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2982 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2983 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2984 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2985 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2986 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2987 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2988 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2989 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2990 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2991 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2992 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2993 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2994 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2995 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2996 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2997 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2998 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2999 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
3000
3001 #ifdef PNG_USE_GLOBAL_ARRAYS
3002 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
3003 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
3004 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
3005 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
3006 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
3007 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
3008 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
3009 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
3010 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
3011 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
3012 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
3013 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
3014 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
3015 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
3016 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
3017 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
3018 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
3019 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
3020 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
3021 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
3022 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
3023 #endif /* PNG_USE_GLOBAL_ARRAYS */
3024
3025 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3026 /* Initialize png_ptr struct for reading, and allocate any other memory.
3027 * (old interface - DEPRECATED - use png_create_read_struct instead).
3028 */
3029 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
3030 #undef png_read_init
3031 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
3032 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3033 #endif
3034
3035 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
3036 png_const_charp user_png_ver, png_size_t png_struct_size));
3037 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3038 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
3039 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3040 png_info_size));
3041 #endif
3042
3043 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3044 /* Initialize png_ptr struct for writing, and allocate any other memory.
3045 * (old interface - DEPRECATED - use png_create_write_struct instead).
3046 */
3047 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
3048 #undef png_write_init
3049 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
3050 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3051 #endif
3052
3053 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
3054 png_const_charp user_png_ver, png_size_t png_struct_size));
3055 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
3056 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3057 png_info_size));
3058
3059 /* Allocate memory for an internal libpng struct */
3060 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
3061
3062 /* Free memory from internal libpng struct */
3063 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
3064
3065 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
3066 malloc_fn, png_voidp mem_ptr));
3067 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
3068 png_free_ptr free_fn, png_voidp mem_ptr));
3069
3070 /* Free any memory that info_ptr points to and reset struct. */
3071 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
3072 png_infop info_ptr));
3073
3074 #ifndef PNG_1_0_X
3075 /* Function to allocate memory for zlib. */
3076 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
3077
3078 /* Function to free memory for zlib */
3079 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
3080
3081 #ifdef PNG_SIZE_T
3082 /* Function to convert a sizeof an item to png_sizeof item */
3083 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
3084 #endif
3085
3086 /* Next four functions are used internally as callbacks. PNGAPI is required
3087 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
3088
3089 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
3090 png_bytep data, png_size_t length));
3091
3092 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3093 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
3094 png_bytep buffer, png_size_t length));
3095 #endif
3096
3097 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
3098 png_bytep data, png_size_t length));
3099
3100 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3101 #if !defined(PNG_NO_STDIO)
3102 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
3103 #endif
3104 #endif
3105 #else /* PNG_1_0_X */
3106 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3107 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
3108 png_bytep buffer, png_size_t length));
3109 #endif
3110 #endif /* PNG_1_0_X */
3111
3112 /* Reset the CRC variable */
3113 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
3114
3115 /* Write the "data" buffer to whatever output you are using. */
3116 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
3117 png_size_t length));
3118
3119 /* Read data from whatever input you are using into the "data" buffer */
3120 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
3121 png_size_t length));
3122
3123 /* Read bytes into buf, and update png_ptr->crc */
3124 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
3125 png_size_t length));
3126
3127 /* Decompress data in a chunk that uses compression */
3128 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3129 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3130 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
3131 int comp_type, png_size_t chunklength,
3132 png_size_t prefix_length, png_size_t *data_length));
3133 #endif
3134
3135 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3136 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
3137
3138 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3139 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
3140
3141 /* Calculate the CRC over a section of data. Note that we are only
3142 * passing a maximum of 64K on systems that have this as a memory limit,
3143 * since this is the maximum buffer size we can specify.
3144 */
3145 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3146 png_size_t length));
3147
3148 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3149 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
3150 #endif
3151
3152 /* simple function to write the signature */
3153 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
3154
3155 /* write various chunks */
3156
3157 /* Write the IHDR chunk, and update the png_struct with the necessary
3158 * information.
3159 */
3160 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3161 png_uint_32 height,
3162 int bit_depth, int color_type, int compression_method, int filter_method,
3163 int interlace_method));
3164
3165 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3166 png_uint_32 num_pal));
3167
3168 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3169 png_size_t length));
3170
3171 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
3172
3173 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3174 #ifdef PNG_FLOATING_POINT_SUPPORTED
3175 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
3176 #endif
3177 #ifdef PNG_FIXED_POINT_SUPPORTED
3178 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
3179 file_gamma));
3180 #endif
3181 #endif
3182
3183 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3184 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3185 int color_type));
3186 #endif
3187
3188 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3189 #ifdef PNG_FLOATING_POINT_SUPPORTED
3190 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3191 double white_x, double white_y,
3192 double red_x, double red_y, double green_x, double green_y,
3193 double blue_x, double blue_y));
3194 #endif
3195 #ifdef PNG_FIXED_POINT_SUPPORTED
3196 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3197 png_fixed_point int_white_x, png_fixed_point int_white_y,
3198 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3199 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3200 png_fixed_point int_blue_y));
3201 #endif
3202 #endif
3203
3204 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3205 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3206 int intent));
3207 #endif
3208
3209 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3210 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3211 png_charp name, int compression_type,
3212 png_charp profile, int proflen));
3213 /* Note to maintainer: profile should be png_bytep */
3214 #endif
3215
3216 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3217 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3218 png_sPLT_tp palette));
3219 #endif
3220
3221 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3222 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3223 png_color_16p values, int number, int color_type));
3224 #endif
3225
3226 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3227 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3228 png_color_16p values, int color_type));
3229 #endif
3230
3231 #if defined(PNG_WRITE_hIST_SUPPORTED)
3232 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3233 int num_hist));
3234 #endif
3235
3236 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3237 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3238 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3239 png_charp key, png_charpp new_key));
3240 #endif
3241
3242 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3243 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3244 png_charp text, png_size_t text_len));
3245 #endif
3246
3247 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3248 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3249 png_charp text, png_size_t text_len, int compression));
3250 #endif
3251
3252 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3253 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3254 int compression, png_charp key, png_charp lang, png_charp lang_key,
3255 png_charp text));
3256 #endif
3257
3258 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3259 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3260 png_infop info_ptr, png_textp text_ptr, int num_text));
3261 #endif
3262
3263 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3264 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3265 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3266 #endif
3267
3268 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3269 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3270 png_int_32 X0, png_int_32 X1, int type, int nparams,
3271 png_charp units, png_charpp params));
3272 #endif
3273
3274 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3275 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3276 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3277 int unit_type));
3278 #endif
3279
3280 #if defined(PNG_WRITE_tIME_SUPPORTED)
3281 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3282 png_timep mod_time));
3283 #endif
3284
3285 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3286 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3287 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3288 int unit, double width, double height));
3289 #else
3290 #ifdef PNG_FIXED_POINT_SUPPORTED
3291 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3292 int unit, png_charp width, png_charp height));
3293 #endif
3294 #endif
3295 #endif
3296
3297 /* Called when finished processing a row of data */
3298 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3299
3300 /* Internal use only. Called before first row of data */
3301 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3302
3303 #if defined(PNG_READ_GAMMA_SUPPORTED)
3304 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3305 #endif
3306
3307 /* combine a row of data, dealing with alpha, etc. if requested */
3308 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3309 int mask));
3310
3311 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3312 /* expand an interlaced row */
3313 /* OLD pre-1.0.9 interface:
3314 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3315 png_bytep row, int pass, png_uint_32 transformations));
3316 */
3317 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3318 #endif
3319
3320 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3321
3322 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3323 /* grab pixels out of a row for an interlaced pass */
3324 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3325 png_bytep row, int pass));
3326 #endif
3327
3328 /* unfilter a row */
3329 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3330 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3331
3332 /* Choose the best filter to use and filter the row data */
3333 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3334 png_row_infop row_info));
3335
3336 /* Write out the filtered row. */
3337 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3338 png_bytep filtered_row));
3339 /* finish a row while reading, dealing with interlacing passes, etc. */
3340 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3341
3342 /* initialize the row buffers, etc. */
3343 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3344 /* optional call to update the users info structure */
3345 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3346 png_infop info_ptr));
3347
3348 /* these are the functions that do the transformations */
3349 #if defined(PNG_READ_FILLER_SUPPORTED)
3350 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3351 png_bytep row, png_uint_32 filler, png_uint_32 flags));
3352 #endif
3353
3354 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3355 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3356 png_bytep row));
3357 #endif
3358
3359 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3360 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3361 png_bytep row));
3362 #endif
3363
3364 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3365 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3366 png_bytep row));
3367 #endif
3368
3369 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3370 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3371 png_bytep row));
3372 #endif
3373
3374 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3375 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3376 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3377 png_bytep row, png_uint_32 flags));
3378 #endif
3379
3380 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3381 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3382 #endif
3383
3384 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3385 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3386 #endif
3387
3388 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3389 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3390 row_info, png_bytep row));
3391 #endif
3392
3393 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3394 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3395 png_bytep row));
3396 #endif
3397
3398 #if defined(PNG_READ_PACK_SUPPORTED)
3399 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3400 #endif
3401
3402 #if defined(PNG_READ_SHIFT_SUPPORTED)
3403 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3404 png_color_8p sig_bits));
3405 #endif
3406
3407 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3408 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3409 #endif
3410
3411 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3412 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3413 #endif
3414
3415 #if defined(PNG_READ_DITHER_SUPPORTED)
3416 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3417 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3418
3419 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3420 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3421 png_colorp palette, int num_palette));
3422 # endif
3423 #endif
3424
3425 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3426 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3427 #endif
3428
3429 #if defined(PNG_WRITE_PACK_SUPPORTED)
3430 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3431 png_bytep row, png_uint_32 bit_depth));
3432 #endif
3433
3434 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3435 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3436 png_color_8p bit_depth));
3437 #endif
3438
3439 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3440 #if defined(PNG_READ_GAMMA_SUPPORTED)
3441 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3442 png_color_16p trans_values, png_color_16p background,
3443 png_color_16p background_1,
3444 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3445 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3446 png_uint_16pp gamma_16_to_1, int gamma_shift));
3447 #else
3448 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3449 png_color_16p trans_values, png_color_16p background));
3450 #endif
3451 #endif
3452
3453 #if defined(PNG_READ_GAMMA_SUPPORTED)
3454 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3455 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3456 int gamma_shift));
3457 #endif
3458
3459 #if defined(PNG_READ_EXPAND_SUPPORTED)
3460 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3461 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3462 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3463 png_bytep row, png_color_16p trans_value));
3464 #endif
3465
3466 /* The following decodes the appropriate chunks, and does error correction,
3467 * then calls the appropriate callback for the chunk if it is valid.
3468 */
3469
3470 /* decode the IHDR chunk */
3471 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3472 png_uint_32 length));
3473 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3474 png_uint_32 length));
3475 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3476 png_uint_32 length));
3477
3478 #if defined(PNG_READ_bKGD_SUPPORTED)
3479 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3480 png_uint_32 length));
3481 #endif
3482
3483 #if defined(PNG_READ_cHRM_SUPPORTED)
3484 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3485 png_uint_32 length));
3486 #endif
3487
3488 #if defined(PNG_READ_gAMA_SUPPORTED)
3489 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3490 png_uint_32 length));
3491 #endif
3492
3493 #if defined(PNG_READ_hIST_SUPPORTED)
3494 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3495 png_uint_32 length));
3496 #endif
3497
3498 #if defined(PNG_READ_iCCP_SUPPORTED)
3499 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3500 png_uint_32 length));
3501 #endif /* PNG_READ_iCCP_SUPPORTED */
3502
3503 #if defined(PNG_READ_iTXt_SUPPORTED)
3504 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3505 png_uint_32 length));
3506 #endif
3507
3508 #if defined(PNG_READ_oFFs_SUPPORTED)
3509 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3510 png_uint_32 length));
3511 #endif
3512
3513 #if defined(PNG_READ_pCAL_SUPPORTED)
3514 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3515 png_uint_32 length));
3516 #endif
3517
3518 #if defined(PNG_READ_pHYs_SUPPORTED)
3519 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3520 png_uint_32 length));
3521 #endif
3522
3523 #if defined(PNG_READ_sBIT_SUPPORTED)
3524 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3525 png_uint_32 length));
3526 #endif
3527
3528 #if defined(PNG_READ_sCAL_SUPPORTED)
3529 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3530 png_uint_32 length));
3531 #endif
3532
3533 #if defined(PNG_READ_sPLT_SUPPORTED)
3534 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3535 png_uint_32 length));
3536 #endif /* PNG_READ_sPLT_SUPPORTED */
3537
3538 #if defined(PNG_READ_sRGB_SUPPORTED)
3539 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3540 png_uint_32 length));
3541 #endif
3542
3543 #if defined(PNG_READ_tEXt_SUPPORTED)
3544 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3545 png_uint_32 length));
3546 #endif
3547
3548 #if defined(PNG_READ_tIME_SUPPORTED)
3549 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3550 png_uint_32 length));
3551 #endif
3552
3553 #if defined(PNG_READ_tRNS_SUPPORTED)
3554 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3555 png_uint_32 length));
3556 #endif
3557
3558 #if defined(PNG_READ_zTXt_SUPPORTED)
3559 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3560 png_uint_32 length));
3561 #endif
3562
3563 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3564 png_infop info_ptr, png_uint_32 length));
3565
3566 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3567 png_bytep chunk_name));
3568
3569 /* handle the transformations for reading and writing */
3570 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3571 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3572
3573 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3574
3575 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3576 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3577 png_infop info_ptr));
3578 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3579 png_infop info_ptr));
3580 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3581 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3582 png_uint_32 length));
3583 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3584 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3585 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3586 png_bytep buffer, png_size_t buffer_length));
3587 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3588 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3589 png_bytep buffer, png_size_t buffer_length));
3590 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3591 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3592 png_infop info_ptr, png_uint_32 length));
3593 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3594 png_infop info_ptr));
3595 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3596 png_infop info_ptr));
3597 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3598 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3599 png_infop info_ptr));
3600 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3601 png_infop info_ptr));
3602 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3603 #if defined(PNG_READ_tEXt_SUPPORTED)
3604 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3605 png_infop info_ptr, png_uint_32 length));
3606 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3607 png_infop info_ptr));
3608 #endif
3609 #if defined(PNG_READ_zTXt_SUPPORTED)
3610 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3611 png_infop info_ptr, png_uint_32 length));
3612 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3613 png_infop info_ptr));
3614 #endif
3615 #if defined(PNG_READ_iTXt_SUPPORTED)
3616 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3617 png_infop info_ptr, png_uint_32 length));
3618 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3619 png_infop info_ptr));
3620 #endif
3621
3622 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3623
3624 #ifdef PNG_MNG_FEATURES_SUPPORTED
3625 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3626 png_bytep row));
3627 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3628 png_bytep row));
3629 #endif
3630
3631 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3632 #if defined(PNG_MMX_CODE_SUPPORTED)
3633 /* png.c */ /* PRIVATE */
3634 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3635 #endif
3636 #endif
3637
3638 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3639 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3640 png_infop info_ptr));
3641
3642 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3643 png_infop info_ptr));
3644
3645 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3646 png_infop info_ptr));
3647
3648 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3649 png_infop info_ptr));
3650
3651 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3652 png_infop info_ptr));
3653
3654 #if defined(PNG_pHYs_SUPPORTED)
3655 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3656 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3657 #endif /* PNG_pHYs_SUPPORTED */
3658 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3659
3660 /* Read the chunk header (length + type name) */
3661 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
3662
3663 /* Added at libpng version 1.2.34 */
3664 #if defined(PNG_cHRM_SUPPORTED)
3665 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
3666 png_fixed_point int_white_x, png_fixed_point int_white_y,
3667 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3668 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3669 png_fixed_point int_blue_y));
3670 #endif
3671
3672 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3673
3674 #endif /* PNG_INTERNAL */
3675
3676 #ifdef __cplusplus
3677 }
3678 #endif
3679
3680 #endif /* PNG_VERSION_INFO_ONLY */
3681 /* do not put anything past this line */
3682 #endif /* PNG_H */

   
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