1 /* png.h - header file for PNG reference library
3 * libpng version 1.2.34 - December 18, 2008
4 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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 1.2.34 - December 18, 2008: Glenn
12 * See also "Contributing Authors", below.
14 * Note about libpng version numbers:
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:
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
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.
44 * 1.0.5 (+ 2 patches) 10005
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)
51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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]
221 * Henceforth the source version will match the shared-library major
222 * and minor numbers; the shared-library major version number will be
223 * used for changes in backward compatibility, as it is intended. The
224 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
225 * for applications, is an unsigned integer of the form xyyzz corresponding
226 * to the source version x.y.z (leading zeros in y and z). Beta versions
227 * were given the previous public release number plus a letter, until
228 * version 1.0.6j; from then on they were given the upcoming public
229 * release number plus "betaNN" or "rcNN".
231 * Binary incompatibility exists only when applications make direct access
232 * to the info_ptr or png_ptr members through png.h, and the compiled
233 * application is loaded with a different version of the library.
235 * DLLNUM will change each time there are forward or backward changes
236 * in binary compatibility (e.g., when a new feature is added).
238 * See libpng.txt or libpng.3 for more information. The PNG specification
239 * is available as a W3C Recommendation and as an ISO Specification,
240 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
244 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
246 * If you modify libpng you may insert additional notices immediately following
249 * libpng versions 1.2.6, August 15, 2004, through 1.2.34, December 18, 2008, are
250 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
251 * distributed according to the same disclaimer and license as libpng-1.2.5
252 * with the following individual added to the list of Contributing Authors:
256 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
257 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
258 * distributed according to the same disclaimer and license as libpng-1.0.6
259 * with the following individuals added to the list of Contributing Authors:
261 * Simon-Pierre Cadieux
265 * and with the following additions to the disclaimer:
267 * There is no warranty against interference with your enjoyment of the
268 * library or against infringement. There is no warranty that our
269 * efforts or the library will fulfill any of your particular purposes
270 * or needs. This library is provided with all faults, and the entire
271 * risk of satisfactory quality, performance, accuracy, and effort is with
274 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
275 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
276 * distributed according to the same disclaimer and license as libpng-0.96,
277 * with the following individuals added to the list of Contributing Authors:
280 * Glenn Randers-Pehrson
283 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
284 * Copyright (c) 1996, 1997 Andreas Dilger
285 * Distributed according to the same disclaimer and license as libpng-0.88,
286 * with the following individuals added to the list of Contributing Authors:
295 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
296 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
298 * For the purposes of this copyright and license, "Contributing Authors"
299 * is defined as the following set of individuals:
307 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
308 * and Group 42, Inc. disclaim all warranties, expressed or implied,
309 * including, without limitation, the warranties of merchantability and of
310 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
311 * assume no liability for direct, indirect, incidental, special, exemplary,
312 * or consequential damages, which may result from the use of the PNG
313 * Reference Library, even if advised of the possibility of such damage.
315 * Permission is hereby granted to use, copy, modify, and distribute this
316 * source code, or portions hereof, for any purpose, without fee, subject
317 * to the following restrictions:
319 * 1. The origin of this source code must not be misrepresented.
321 * 2. Altered versions must be plainly marked as such and
322 * must not be misrepresented as being the original source.
324 * 3. This Copyright notice may not be removed or altered from
325 * any source or altered source distribution.
327 * The Contributing Authors and Group 42, Inc. specifically permit, without
328 * fee, and encourage the use of this source code as a component to
329 * supporting the PNG file format in commercial products. If you use this
330 * source code in a product, acknowledgment is not required but would be
335 * A "png_get_copyright" function is available, for convenient use in "about"
336 * boxes and the like:
338 * printf("%s",png_get_copyright(NULL));
340 * Also, the PNG logo (in PNG format, of course) is supplied in the
341 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
345 * Libpng is OSI Certified Open Source Software. OSI Certified is a
346 * certification mark of the Open Source Initiative.
350 * The contributing authors would like to thank all those who helped
351 * with testing, bug fixes, and patience. This wouldn't have been
352 * possible without all of you.
354 * Thanks to Frank J. T. Wojcik for helping with the documentation.
358 * Y2K compliance in libpng:
359 * =========================
363 * Since the PNG Development group is an ad-hoc body, we can't make
364 * an official declaration.
366 * This is your unofficial assurance that libpng from version 0.71 and
367 * upward through 1.2.34 are Y2K compliant. It is my belief that earlier
368 * versions were also Y2K compliant.
370 * Libpng only has three year fields. One is a 2-byte unsigned integer
371 * that will hold years up to 65535. The other two hold the date in text
372 * format, and will hold years up to 9999.
375 * "png_uint_16 year" in png_time_struct.
378 * "png_charp time_buffer" in png_struct and
379 * "near_time_buffer", which is a local character string in png.c.
381 * There are seven time-related functions:
382 * png.c: png_convert_to_rfc_1123() in png.c
383 * (formerly png_convert_to_rfc_1152() in error)
384 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
385 * png_convert_from_time_t() in pngwrite.c
386 * png_get_tIME() in pngget.c
387 * png_handle_tIME() in pngrutil.c, called in pngread.c
388 * png_set_tIME() in pngset.c
389 * png_write_tIME() in pngwutil.c, called in pngwrite.c
391 * All handle dates properly in a Y2K environment. The
392 * png_convert_from_time_t() function calls gmtime() to convert from system
393 * clock time, which returns (year - 1900), which we properly convert to
394 * the full 4-digit year. There is a possibility that applications using
395 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
396 * function, or that they are incorrectly passing only a 2-digit year
397 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
398 * but this is not under our control. The libpng documentation has always
399 * stated that it works with 4-digit years, and the APIs have been
400 * documented as such.
402 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
403 * integer to hold the year, and can hold years as large as 65535.
405 * zlib, upon which libpng depends, is also Y2K compliant. It contains
406 * no date-related code.
408 * Glenn Randers-Pehrson
410 * PNG Development Group
416 /* This is not the place to learn how to use libpng. The file libpng.txt
417 * describes how to use libpng, and the file example.c summarizes it
418 * with some code on which to build. This file is useful for looking
419 * at the actual function definitions and structure components.
422 /* Version information for png.h - this should match the version in png.c */
423 #define PNG_LIBPNG_VER_STRING "1.2.34"
424 #define PNG_HEADER_VERSION_STRING \
425 " libpng version 1.2.34 - December 18, 2008\n"
427 #define PNG_LIBPNG_VER_SONUM 0
428 #define PNG_LIBPNG_VER_DLLNUM 13
430 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
431 #define PNG_LIBPNG_VER_MAJOR 1
432 #define PNG_LIBPNG_VER_MINOR 2
433 #define PNG_LIBPNG_VER_RELEASE 34
434 /* This should match the numeric part of the final component of
435 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
437 #define PNG_LIBPNG_VER_BUILD 0
440 #define PNG_LIBPNG_BUILD_ALPHA 1
441 #define PNG_LIBPNG_BUILD_BETA 2
442 #define PNG_LIBPNG_BUILD_RC 3
443 #define PNG_LIBPNG_BUILD_STABLE 4
444 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
446 /* Release-Specific Flags */
447 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
448 PNG_LIBPNG_BUILD_STABLE only */
449 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
450 PNG_LIBPNG_BUILD_SPECIAL */
451 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
452 PNG_LIBPNG_BUILD_PRIVATE */
454 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
456 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
457 * We must not include leading zeros.
458 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
459 * version 1.0.0 was mis-numbered 100 instead of 10000). From
460 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
461 #define PNG_LIBPNG_VER 10234 /* 1.2.34 */
463 #ifndef PNG_VERSION_INFO_ONLY
464 /* include the compression library's header */
468 /* include all user configurable info, including optional assembler routines */
472 * Added at libpng-1.2.8 */
473 /* Ref MSDN: Private as priority over Special
474 * VS_FF_PRIVATEBUILD File *was not* built using standard release
475 * procedures. If this value is given, the StringFileInfo block must
476 * contain a PrivateBuild string.
478 * VS_FF_SPECIALBUILD File *was* built by the original company using
479 * standard release procedures but is a variation of the standard
480 * file of the same version number. If this value is given, the
481 * StringFileInfo block must contain a SpecialBuild string.
484 #if defined(PNG_USER_PRIVATEBUILD)
485 # define PNG_LIBPNG_BUILD_TYPE \
486 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
488 # if defined(PNG_LIBPNG_SPECIALBUILD)
489 # define PNG_LIBPNG_BUILD_TYPE \
490 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
492 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
496 #ifndef PNG_VERSION_INFO_ONLY
498 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
501 #endif /* __cplusplus */
503 /* This file is arranged in several sections. The first section contains
504 * structure and type definitions. The second section contains the external
505 * library functions, while the third has the internal library functions,
506 * which applications aren't expected to use directly.
509 #ifndef PNG_NO_TYPECAST_NULL
510 #define int_p_NULL (int *)NULL
511 #define png_bytep_NULL (png_bytep)NULL
512 #define png_bytepp_NULL (png_bytepp)NULL
513 #define png_doublep_NULL (png_doublep)NULL
514 #define png_error_ptr_NULL (png_error_ptr)NULL
515 #define png_flush_ptr_NULL (png_flush_ptr)NULL
516 #define png_free_ptr_NULL (png_free_ptr)NULL
517 #define png_infopp_NULL (png_infopp)NULL
518 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
519 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
520 #define png_rw_ptr_NULL (png_rw_ptr)NULL
521 #define png_structp_NULL (png_structp)NULL
522 #define png_uint_16p_NULL (png_uint_16p)NULL
523 #define png_voidp_NULL (png_voidp)NULL
524 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
526 #define int_p_NULL NULL
527 #define png_bytep_NULL NULL
528 #define png_bytepp_NULL NULL
529 #define png_doublep_NULL NULL
530 #define png_error_ptr_NULL NULL
531 #define png_flush_ptr_NULL NULL
532 #define png_free_ptr_NULL NULL
533 #define png_infopp_NULL NULL
534 #define png_malloc_ptr_NULL NULL
535 #define png_read_status_ptr_NULL NULL
536 #define png_rw_ptr_NULL NULL
537 #define png_structp_NULL NULL
538 #define png_uint_16p_NULL NULL
539 #define png_voidp_NULL NULL
540 #define png_write_status_ptr_NULL NULL
543 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
544 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
545 /* Version information for C files, stored in png.c. This had better match
548 #ifdef PNG_USE_GLOBAL_ARRAYS
549 PNG_EXPORT_VAR (PNG_CONST
char) png_libpng_ver
[18];
550 /* need room for 99.99.99beta99z */
552 #define png_libpng_ver png_get_header_ver(NULL)
555 #ifdef PNG_USE_GLOBAL_ARRAYS
556 /* This was removed in version 1.0.5c */
557 /* Structures to facilitate easy interlacing. See png.c for more details */
558 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_start
[7];
559 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_inc
[7];
560 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_ystart
[7];
561 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_yinc
[7];
562 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_mask
[7];
563 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_dsp_mask
[7];
564 /* This isn't currently used. If you need it, see png.c for more details.
565 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
569 #endif /* PNG_NO_EXTERN */
571 /* Three color definitions. The order of the red, green, and blue, (and the
572 * exact size) is not important, although the size of the fields need to
573 * be png_byte or png_uint_16 (as defined below).
575 typedef struct png_color_struct
581 typedef png_color FAR
* png_colorp
;
582 typedef png_color FAR
* FAR
* png_colorpp
;
584 typedef struct png_color_16_struct
586 png_byte index
; /* used for palette files */
587 png_uint_16 red
; /* for use in red green blue files */
590 png_uint_16 gray
; /* for use in grayscale files */
592 typedef png_color_16 FAR
* png_color_16p
;
593 typedef png_color_16 FAR
* FAR
* png_color_16pp
;
595 typedef struct png_color_8_struct
597 png_byte red
; /* for use in red green blue files */
600 png_byte gray
; /* for use in grayscale files */
601 png_byte alpha
; /* for alpha channel files */
603 typedef png_color_8 FAR
* png_color_8p
;
604 typedef png_color_8 FAR
* FAR
* png_color_8pp
;
607 * The following two structures are used for the in-core representation
610 typedef struct png_sPLT_entry_struct
616 png_uint_16 frequency
;
618 typedef png_sPLT_entry FAR
* png_sPLT_entryp
;
619 typedef png_sPLT_entry FAR
* FAR
* png_sPLT_entrypp
;
621 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
622 * occupy the LSB of their respective members, and the MSB of each member
623 * is zero-filled. The frequency member always occupies the full 16 bits.
626 typedef struct png_sPLT_struct
628 png_charp name
; /* palette name */
629 png_byte depth
; /* depth of palette samples */
630 png_sPLT_entryp entries
; /* palette entries */
631 png_int_32 nentries
; /* number of palette entries */
633 typedef png_sPLT_t FAR
* png_sPLT_tp
;
634 typedef png_sPLT_t FAR
* FAR
* png_sPLT_tpp
;
636 #ifdef PNG_TEXT_SUPPORTED
637 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
638 * and whether that contents is compressed or not. The "key" field
639 * points to a regular zero-terminated C string. The "text", "lang", and
640 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
641 * However, the * structure returned by png_get_text() will always contain
642 * regular zero-terminated C strings (possibly empty), never NULL pointers,
643 * so they can be safely used in printf() and other string-handling functions.
645 typedef struct png_text_struct
647 int compression
; /* compression value:
652 png_charp key
; /* keyword, 1-79 character description of "text" */
653 png_charp text
; /* comment, may be an empty string (ie "")
655 png_size_t text_length
; /* length of the text string */
656 #ifdef PNG_iTXt_SUPPORTED
657 png_size_t itxt_length
; /* length of the itxt string */
658 png_charp lang
; /* language code, 0-79 characters
660 png_charp lang_key
; /* keyword translated UTF-8 string, 0 or more
661 chars or a NULL pointer */
664 typedef png_text FAR
* png_textp
;
665 typedef png_text FAR
* FAR
* png_textpp
;
668 /* Supported compression types for text in PNG files (tEXt, and zTXt).
669 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
670 #define PNG_TEXT_COMPRESSION_NONE_WR -3
671 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
672 #define PNG_TEXT_COMPRESSION_NONE -1
673 #define PNG_TEXT_COMPRESSION_zTXt 0
674 #define PNG_ITXT_COMPRESSION_NONE 1
675 #define PNG_ITXT_COMPRESSION_zTXt 2
676 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
678 /* png_time is a way to hold the time in an machine independent way.
679 * Two conversions are provided, both from time_t and struct tm. There
680 * is no portable way to convert to either of these structures, as far
681 * as I know. If you know of a portable way, send it to me. As a side
682 * note - PNG has always been Year 2000 compliant!
684 typedef struct png_time_struct
686 png_uint_16 year
; /* full year, as in, 1995 */
687 png_byte month
; /* month of year, 1 - 12 */
688 png_byte day
; /* day of month, 1 - 31 */
689 png_byte hour
; /* hour of day, 0 - 23 */
690 png_byte minute
; /* minute of hour, 0 - 59 */
691 png_byte second
; /* second of minute, 0 - 60 (for leap seconds) */
693 typedef png_time FAR
* png_timep
;
694 typedef png_time FAR
* FAR
* png_timepp
;
696 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
697 /* png_unknown_chunk is a structure to hold queued chunks for which there is
698 * no specific support. The idea is that we can use this to queue
699 * up private chunks for output even though the library doesn't actually
700 * know about their semantics.
702 #define PNG_CHUNK_NAME_LENGTH 5
703 typedef struct png_unknown_chunk_t
705 png_byte name
[PNG_CHUNK_NAME_LENGTH
];
709 /* libpng-using applications should NOT directly modify this byte. */
710 png_byte location
; /* mode of operation at read time */
713 typedef png_unknown_chunk FAR
* png_unknown_chunkp
;
714 typedef png_unknown_chunk FAR
* FAR
* png_unknown_chunkpp
;
717 /* png_info is a structure that holds the information in a PNG file so
718 * that the application can find out the characteristics of the image.
719 * If you are reading the file, this structure will tell you what is
720 * in the PNG file. If you are writing the file, fill in the information
721 * you want to put into the PNG file, then call png_write_info().
722 * The names chosen should be very close to the PNG specification, so
723 * consult that document for information about the meaning of each field.
725 * With libpng < 0.95, it was only possible to directly set and read the
726 * the values in the png_info_struct, which meant that the contents and
727 * order of the values had to remain fixed. With libpng 0.95 and later,
728 * however, there are now functions that abstract the contents of
729 * png_info_struct from the application, so this makes it easier to use
730 * libpng with dynamic libraries, and even makes it possible to use
731 * libraries that don't have all of the libpng ancillary chunk-handing
734 * In any case, the order of the parameters in png_info_struct should NOT
735 * be changed for as long as possible to keep compatibility with applications
736 * that use the old direct-access method with png_info_struct.
738 * The following members may have allocated storage attached that should be
739 * cleaned up before the structure is discarded: palette, trans, text,
740 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
741 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
742 * are automatically freed when the info structure is deallocated, if they were
743 * allocated internally by libpng. This behavior can be changed by means
744 * of the png_data_freer() function.
746 * More allocation details: all the chunk-reading functions that
747 * change these members go through the corresponding png_set_*
748 * functions. A function to clear these members is available: see
749 * png_free_data(). The png_set_* functions do not depend on being
750 * able to point info structure members to any of the storage they are
751 * passed (they make their own copies), EXCEPT that the png_set_text
752 * functions use the same storage passed to them in the text_ptr or
753 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
754 * functions do not make their own copies.
756 typedef struct png_info_struct
758 /* the following are necessary for every PNG file */
759 png_uint_32 width
; /* width of image in pixels (from IHDR) */
760 png_uint_32 height
; /* height of image in pixels (from IHDR) */
761 png_uint_32 valid
; /* valid chunk data (see PNG_INFO_ below) */
762 png_uint_32 rowbytes
; /* bytes needed to hold an untransformed row */
763 png_colorp palette
; /* array of color values (valid & PNG_INFO_PLTE) */
764 png_uint_16 num_palette
; /* number of color entries in "palette" (PLTE) */
765 png_uint_16 num_trans
; /* number of transparent palette color (tRNS) */
766 png_byte bit_depth
; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
767 png_byte color_type
; /* see PNG_COLOR_TYPE_ below (from IHDR) */
768 /* The following three should have been named *_method not *_type */
769 png_byte compression_type
; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
770 png_byte filter_type
; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
771 png_byte interlace_type
; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
773 /* The following is informational only on read, and not used on writes. */
774 png_byte channels
; /* number of data channels per pixel (1, 2, 3, 4) */
775 png_byte pixel_depth
; /* number of bits per pixel */
776 png_byte spare_byte
; /* to align the data, and for future use */
777 png_byte signature
[8]; /* magic bytes read by libpng from start of file */
779 /* The rest of the data is optional. If you are reading, check the
780 * valid field to see if the information in these are valid. If you
781 * are writing, set the valid field to those chunks you want written,
782 * and initialize the appropriate fields below.
785 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
786 /* The gAMA chunk describes the gamma characteristics of the system
787 * on which the image was created, normally in the range [1.0, 2.5].
788 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
790 float gamma
; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
793 #if defined(PNG_sRGB_SUPPORTED)
795 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
796 png_byte srgb_intent
; /* sRGB rendering intent [0, 1, 2, or 3] */
799 #if defined(PNG_TEXT_SUPPORTED)
800 /* The tEXt, and zTXt chunks contain human-readable textual data in
801 * uncompressed, compressed, and optionally compressed forms, respectively.
802 * The data in "text" is an array of pointers to uncompressed,
803 * null-terminated C strings. Each chunk has a keyword that describes the
804 * textual data contained in that chunk. Keywords are not required to be
805 * unique, and the text string may be empty. Any number of text chunks may
808 int num_text
; /* number of comments read/to write */
809 int max_text
; /* current size of text array */
810 png_textp text
; /* array of comments read/to write */
811 #endif /* PNG_TEXT_SUPPORTED */
813 #if defined(PNG_tIME_SUPPORTED)
814 /* The tIME chunk holds the last time the displayed image data was
815 * modified. See the png_time struct for the contents of this struct.
820 #if defined(PNG_sBIT_SUPPORTED)
821 /* The sBIT chunk specifies the number of significant high-order bits
822 * in the pixel data. Values are in the range [1, bit_depth], and are
823 * only specified for the channels in the pixel data. The contents of
824 * the low-order bits is not specified. Data is valid if
825 * (valid & PNG_INFO_sBIT) is non-zero.
827 png_color_8 sig_bit
; /* significant bits in color channels */
830 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
831 defined(PNG_READ_BACKGROUND_SUPPORTED)
832 /* The tRNS chunk supplies transparency data for paletted images and
833 * other image types that don't need a full alpha channel. There are
834 * "num_trans" transparency values for a paletted image, stored in the
835 * same order as the palette colors, starting from index 0. Values
836 * for the data are in the range [0, 255], ranging from fully transparent
837 * to fully opaque, respectively. For non-paletted images, there is a
838 * single color specified that should be treated as fully transparent.
839 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
841 png_bytep trans
; /* transparent values for paletted image */
842 png_color_16 trans_values
; /* transparent color for non-palette image */
845 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
846 /* The bKGD chunk gives the suggested image background color if the
847 * display program does not have its own background color and the image
848 * is needs to composited onto a background before display. The colors
849 * in "background" are normally in the same color space/depth as the
850 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
852 png_color_16 background
;
855 #if defined(PNG_oFFs_SUPPORTED)
856 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
857 * and downwards from the top-left corner of the display, page, or other
858 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
859 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
861 png_int_32 x_offset
; /* x offset on page */
862 png_int_32 y_offset
; /* y offset on page */
863 png_byte offset_unit_type
; /* offset units type */
866 #if defined(PNG_pHYs_SUPPORTED)
867 /* The pHYs chunk gives the physical pixel density of the image for
868 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
869 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
871 png_uint_32 x_pixels_per_unit
; /* horizontal pixel density */
872 png_uint_32 y_pixels_per_unit
; /* vertical pixel density */
873 png_byte phys_unit_type
; /* resolution type (see PNG_RESOLUTION_ below) */
876 #if defined(PNG_hIST_SUPPORTED)
877 /* The hIST chunk contains the relative frequency or importance of the
878 * various palette entries, so that a viewer can intelligently select a
879 * reduced-color palette, if required. Data is an array of "num_palette"
880 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
886 #ifdef PNG_cHRM_SUPPORTED
887 /* The cHRM chunk describes the CIE color characteristics of the monitor
888 * on which the PNG was created. This data allows the viewer to do gamut
889 * mapping of the input image to ensure that the viewer sees the same
890 * colors in the image as the creator. Values are in the range
891 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
893 #ifdef PNG_FLOATING_POINT_SUPPORTED
905 #if defined(PNG_pCAL_SUPPORTED)
906 /* The pCAL chunk describes a transformation between the stored pixel
907 * values and original physical data values used to create the image.
908 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
909 * range given by [pcal_X0, pcal_X1], and are further transformed by a
910 * (possibly non-linear) transformation function given by "pcal_type"
911 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
912 * defines below, and the PNG-Group's PNG extensions document for a
913 * complete description of the transformations and how they should be
914 * implemented, and for a description of the ASCII parameter strings.
915 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
917 png_charp pcal_purpose
; /* pCAL chunk description string */
918 png_int_32 pcal_X0
; /* minimum value */
919 png_int_32 pcal_X1
; /* maximum value */
920 png_charp pcal_units
; /* Latin-1 string giving physical units */
921 png_charpp pcal_params
; /* ASCII strings containing parameter values */
922 png_byte pcal_type
; /* equation type (see PNG_EQUATION_ below) */
923 png_byte pcal_nparams
; /* number of parameters given in pcal_params */
926 /* New members added in libpng-1.0.6 */
927 #ifdef PNG_FREE_ME_SUPPORTED
928 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
931 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
932 /* storage for unknown chunks that the library doesn't recognize. */
933 png_unknown_chunkp unknown_chunks
;
934 png_size_t unknown_chunks_num
;
937 #if defined(PNG_iCCP_SUPPORTED)
938 /* iCCP chunk data. */
939 png_charp iccp_name
; /* profile name */
940 png_charp iccp_profile
; /* International Color Consortium profile data */
941 /* Note to maintainer: should be png_bytep */
942 png_uint_32 iccp_proflen
; /* ICC profile data length */
943 png_byte iccp_compression
; /* Always zero */
946 #if defined(PNG_sPLT_SUPPORTED)
947 /* data on sPLT chunks (there may be more than one). */
948 png_sPLT_tp splt_palettes
;
949 png_uint_32 splt_palettes_num
;
952 #if defined(PNG_sCAL_SUPPORTED)
953 /* The sCAL chunk describes the actual physical dimensions of the
954 * subject matter of the graphic. The chunk contains a unit specification
955 * a byte value, and two ASCII strings representing floating-point
956 * values. The values are width and height corresponsing to one pixel
957 * in the image. This external representation is converted to double
958 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
960 png_byte scal_unit
; /* unit of physical scale */
961 #ifdef PNG_FLOATING_POINT_SUPPORTED
962 double scal_pixel_width
; /* width of one pixel */
963 double scal_pixel_height
; /* height of one pixel */
965 #ifdef PNG_FIXED_POINT_SUPPORTED
966 png_charp scal_s_width
; /* string containing height */
967 png_charp scal_s_height
; /* string containing width */
971 #if defined(PNG_INFO_IMAGE_SUPPORTED)
972 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
973 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
974 png_bytepp row_pointers
; /* the image bits */
977 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
978 png_fixed_point int_gamma
; /* gamma of image, if (valid & PNG_INFO_gAMA) */
981 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
982 png_fixed_point int_x_white
;
983 png_fixed_point int_y_white
;
984 png_fixed_point int_x_red
;
985 png_fixed_point int_y_red
;
986 png_fixed_point int_x_green
;
987 png_fixed_point int_y_green
;
988 png_fixed_point int_x_blue
;
989 png_fixed_point int_y_blue
;
994 typedef png_info FAR
* png_infop
;
995 typedef png_info FAR
* FAR
* png_infopp
;
997 /* Maximum positive integer used in PNG is (2^31)-1 */
998 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
999 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
1000 #define PNG_SIZE_MAX ((png_size_t)(-1))
1001 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1002 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
1003 #define PNG_MAX_UINT PNG_UINT_31_MAX
1006 /* These describe the color_type field in png_info. */
1007 /* color type masks */
1008 #define PNG_COLOR_MASK_PALETTE 1
1009 #define PNG_COLOR_MASK_COLOR 2
1010 #define PNG_COLOR_MASK_ALPHA 4
1012 /* color types. Note that not all combinations are legal */
1013 #define PNG_COLOR_TYPE_GRAY 0
1014 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
1015 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
1016 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
1017 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
1019 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
1020 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
1022 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
1023 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
1024 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1026 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
1027 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1028 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1029 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1031 /* These are for the interlacing type. These values should NOT be changed. */
1032 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1033 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1034 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
1036 /* These are for the oFFs chunk. These values should NOT be changed. */
1037 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1038 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1039 #define PNG_OFFSET_LAST 2 /* Not a valid value */
1041 /* These are for the pCAL chunk. These values should NOT be changed. */
1042 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1043 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1044 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1045 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1046 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1048 /* These are for the sCAL chunk. These values should NOT be changed. */
1049 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1050 #define PNG_SCALE_METER 1 /* meters per pixel */
1051 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1052 #define PNG_SCALE_LAST 3 /* Not a valid value */
1054 /* These are for the pHYs chunk. These values should NOT be changed. */
1055 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1056 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1057 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1059 /* These are for the sRGB chunk. These values should NOT be changed. */
1060 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1061 #define PNG_sRGB_INTENT_RELATIVE 1
1062 #define PNG_sRGB_INTENT_SATURATION 2
1063 #define PNG_sRGB_INTENT_ABSOLUTE 3
1064 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1066 /* This is for text chunks */
1067 #define PNG_KEYWORD_MAX_LENGTH 79
1069 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1070 #define PNG_MAX_PALETTE_LENGTH 256
1072 /* These determine if an ancillary chunk's data has been successfully read
1073 * from the PNG header, or if the application has filled in the corresponding
1074 * data in the info_struct to be written into the output file. The values
1075 * of the PNG_INFO_<chunk> defines should NOT be changed.
1077 #define PNG_INFO_gAMA 0x0001
1078 #define PNG_INFO_sBIT 0x0002
1079 #define PNG_INFO_cHRM 0x0004
1080 #define PNG_INFO_PLTE 0x0008
1081 #define PNG_INFO_tRNS 0x0010
1082 #define PNG_INFO_bKGD 0x0020
1083 #define PNG_INFO_hIST 0x0040
1084 #define PNG_INFO_pHYs 0x0080
1085 #define PNG_INFO_oFFs 0x0100
1086 #define PNG_INFO_tIME 0x0200
1087 #define PNG_INFO_pCAL 0x0400
1088 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1089 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1090 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1091 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1092 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1094 /* This is used for the transformation routines, as some of them
1095 * change these values for the row. It also should enable using
1096 * the routines for other purposes.
1098 typedef struct png_row_info_struct
1100 png_uint_32 width
; /* width of row */
1101 png_uint_32 rowbytes
; /* number of bytes in row */
1102 png_byte color_type
; /* color type of row */
1103 png_byte bit_depth
; /* bit depth of row */
1104 png_byte channels
; /* number of channels (1, 2, 3, or 4) */
1105 png_byte pixel_depth
; /* bits per pixel (depth * channels) */
1108 typedef png_row_info FAR
* png_row_infop
;
1109 typedef png_row_info FAR
* FAR
* png_row_infopp
;
1111 /* These are the function types for the I/O functions and for the functions
1112 * that allow the user to override the default I/O functions with his or her
1113 * own. The png_error_ptr type should match that of user-supplied warning
1114 * and error functions, while the png_rw_ptr type should match that of the
1115 * user read/write data functions.
1117 typedef struct png_struct_def png_struct
;
1118 typedef png_struct FAR
* png_structp
;
1120 typedef void (PNGAPI
*png_error_ptr
) PNGARG((png_structp
, png_const_charp
));
1121 typedef void (PNGAPI
*png_rw_ptr
) PNGARG((png_structp
, png_bytep
, png_size_t
));
1122 typedef void (PNGAPI
*png_flush_ptr
) PNGARG((png_structp
));
1123 typedef void (PNGAPI
*png_read_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1125 typedef void (PNGAPI
*png_write_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1128 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1129 typedef void (PNGAPI
*png_progressive_info_ptr
) PNGARG((png_structp
, png_infop
));
1130 typedef void (PNGAPI
*png_progressive_end_ptr
) PNGARG((png_structp
, png_infop
));
1131 typedef void (PNGAPI
*png_progressive_row_ptr
) PNGARG((png_structp
, png_bytep
,
1135 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1136 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1137 defined(PNG_LEGACY_SUPPORTED)
1138 typedef void (PNGAPI
*png_user_transform_ptr
) PNGARG((png_structp
,
1139 png_row_infop
, png_bytep
));
1142 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1143 typedef int (PNGAPI
*png_user_chunk_ptr
) PNGARG((png_structp
, png_unknown_chunkp
));
1145 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1146 typedef void (PNGAPI
*png_unknown_chunk_ptr
) PNGARG((png_structp
));
1149 /* Transform masks for the high-level interface */
1150 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1151 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1152 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1153 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1154 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1155 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1156 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1157 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1158 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1159 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1160 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1161 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1162 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */
1163 /* Added to libpng-1.2.34 */
1164 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */
1165 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */
1167 /* Flags for MNG supported features */
1168 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1169 #define PNG_FLAG_MNG_FILTER_64 0x04
1170 #define PNG_ALL_MNG_FEATURES 0x05
1172 typedef png_voidp (*png_malloc_ptr
) PNGARG((png_structp
, png_size_t
));
1173 typedef void (*png_free_ptr
) PNGARG((png_structp
, png_voidp
));
1175 /* The structure that holds the information to read and write PNG files.
1176 * The only people who need to care about what is inside of this are the
1177 * people who will be modifying the library for their own special needs.
1178 * It should NOT be accessed directly by an application, except to store
1182 struct png_struct_def
1184 #ifdef PNG_SETJMP_SUPPORTED
1185 jmp_buf jmpbuf
; /* used in png_error */
1187 png_error_ptr error_fn
; /* function for printing errors and aborting */
1188 png_error_ptr warning_fn
; /* function for printing warnings */
1189 png_voidp error_ptr
; /* user supplied struct for error functions */
1190 png_rw_ptr write_data_fn
; /* function for writing output data */
1191 png_rw_ptr read_data_fn
; /* function for reading input data */
1192 png_voidp io_ptr
; /* ptr to application struct for I/O functions */
1194 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1195 png_user_transform_ptr read_user_transform_fn
; /* user read transform */
1198 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1199 png_user_transform_ptr write_user_transform_fn
; /* user write transform */
1202 /* These were added in libpng-1.0.2 */
1203 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1204 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1205 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1206 png_voidp user_transform_ptr
; /* user supplied struct for user transform */
1207 png_byte user_transform_depth
; /* bit depth of user transformed pixels */
1208 png_byte user_transform_channels
; /* channels in user transformed pixels */
1212 png_uint_32 mode
; /* tells us where we are in the PNG file */
1213 png_uint_32 flags
; /* flags indicating various things to libpng */
1214 png_uint_32 transformations
; /* which transformations to perform */
1216 z_stream zstream
; /* pointer to decompression structure (below) */
1217 png_bytep zbuf
; /* buffer for zlib */
1218 png_size_t zbuf_size
; /* size of zbuf */
1219 int zlib_level
; /* holds zlib compression level */
1220 int zlib_method
; /* holds zlib compression method */
1221 int zlib_window_bits
; /* holds zlib compression window bits */
1222 int zlib_mem_level
; /* holds zlib compression memory level */
1223 int zlib_strategy
; /* holds zlib compression strategy */
1225 png_uint_32 width
; /* width of image in pixels */
1226 png_uint_32 height
; /* height of image in pixels */
1227 png_uint_32 num_rows
; /* number of rows in current pass */
1228 png_uint_32 usr_width
; /* width of row at start of write */
1229 png_uint_32 rowbytes
; /* size of row in bytes */
1230 png_uint_32 irowbytes
; /* size of current interlaced row in bytes */
1231 png_uint_32 iwidth
; /* width of current interlaced row in pixels */
1232 png_uint_32 row_number
; /* current row in interlace pass */
1233 png_bytep prev_row
; /* buffer to save previous (unfiltered) row */
1234 png_bytep row_buf
; /* buffer to save current (unfiltered) row */
1235 #ifndef PNG_NO_WRITE_FILTER
1236 png_bytep sub_row
; /* buffer to save "sub" row when filtering */
1237 png_bytep up_row
; /* buffer to save "up" row when filtering */
1238 png_bytep avg_row
; /* buffer to save "avg" row when filtering */
1239 png_bytep paeth_row
; /* buffer to save "Paeth" row when filtering */
1241 png_row_info row_info
; /* used for transformation routines */
1243 png_uint_32 idat_size
; /* current IDAT size for read */
1244 png_uint_32 crc
; /* current chunk CRC value */
1245 png_colorp palette
; /* palette from the input file */
1246 png_uint_16 num_palette
; /* number of color entries in palette */
1247 png_uint_16 num_trans
; /* number of transparency values */
1248 png_byte chunk_name
[5]; /* null-terminated name of current chunk */
1249 png_byte compression
; /* file compression type (always 0) */
1250 png_byte filter
; /* file filter type (always 0) */
1251 png_byte interlaced
; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1252 png_byte pass
; /* current interlace pass (0 - 6) */
1253 png_byte do_filter
; /* row filter flags (see PNG_FILTER_ below ) */
1254 png_byte color_type
; /* color type of file */
1255 png_byte bit_depth
; /* bit depth of file */
1256 png_byte usr_bit_depth
; /* bit depth of users row */
1257 png_byte pixel_depth
; /* number of bits per pixel */
1258 png_byte channels
; /* number of channels in file */
1259 png_byte usr_channels
; /* channels at start of write */
1260 png_byte sig_bytes
; /* magic bytes read/written from start of file */
1262 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1263 #ifdef PNG_LEGACY_SUPPORTED
1264 png_byte filler
; /* filler byte for pixel expansion */
1266 png_uint_16 filler
; /* filler bytes for pixel expansion */
1270 #if defined(PNG_bKGD_SUPPORTED)
1271 png_byte background_gamma_type
;
1272 # ifdef PNG_FLOATING_POINT_SUPPORTED
1273 float background_gamma
;
1275 png_color_16 background
; /* background color in screen gamma space */
1276 #if defined(PNG_READ_GAMMA_SUPPORTED)
1277 png_color_16 background_1
; /* background normalized to gamma 1.0 */
1279 #endif /* PNG_bKGD_SUPPORTED */
1281 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1282 png_flush_ptr output_flush_fn
;/* Function for flushing output */
1283 png_uint_32 flush_dist
; /* how many rows apart to flush, 0 - no flush */
1284 png_uint_32 flush_rows
; /* number of rows written since last flush */
1287 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1288 int gamma_shift
; /* number of "insignificant" bits 16-bit gamma */
1289 #ifdef PNG_FLOATING_POINT_SUPPORTED
1290 float gamma
; /* file gamma value */
1291 float screen_gamma
; /* screen gamma value (display_exponent) */
1295 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1296 png_bytep gamma_table
; /* gamma table for 8-bit depth files */
1297 png_bytep gamma_from_1
; /* converts from 1.0 to screen */
1298 png_bytep gamma_to_1
; /* converts from file to 1.0 */
1299 png_uint_16pp gamma_16_table
; /* gamma table for 16-bit depth files */
1300 png_uint_16pp gamma_16_from_1
; /* converts from 1.0 to screen */
1301 png_uint_16pp gamma_16_to_1
; /* converts from file to 1.0 */
1304 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1305 png_color_8 sig_bit
; /* significant bits in each available channel */
1308 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1309 png_color_8 shift
; /* shift for significant bit tranformation */
1312 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1313 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1314 png_bytep trans
; /* transparency values for paletted files */
1315 png_color_16 trans_values
; /* transparency values for non-paletted files */
1318 png_read_status_ptr read_row_fn
; /* called after each row is decoded */
1319 png_write_status_ptr write_row_fn
; /* called after each row is encoded */
1320 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1321 png_progressive_info_ptr info_fn
; /* called after header data fully read */
1322 png_progressive_row_ptr row_fn
; /* called after each prog. row is decoded */
1323 png_progressive_end_ptr end_fn
; /* called after image is complete */
1324 png_bytep save_buffer_ptr
; /* current location in save_buffer */
1325 png_bytep save_buffer
; /* buffer for previously read data */
1326 png_bytep current_buffer_ptr
; /* current location in current_buffer */
1327 png_bytep current_buffer
; /* buffer for recently used data */
1328 png_uint_32 push_length
; /* size of current input chunk */
1329 png_uint_32 skip_length
; /* bytes to skip in input data */
1330 png_size_t save_buffer_size
; /* amount of data now in save_buffer */
1331 png_size_t save_buffer_max
; /* total size of save_buffer */
1332 png_size_t buffer_size
; /* total amount of available input data */
1333 png_size_t current_buffer_size
; /* amount of data now in current_buffer */
1334 int process_mode
; /* what push library is currently doing */
1335 int cur_palette
; /* current push library palette index */
1337 # if defined(PNG_TEXT_SUPPORTED)
1338 png_size_t current_text_size
; /* current size of text input data */
1339 png_size_t current_text_left
; /* how much text left to read in input */
1340 png_charp current_text
; /* current text chunk buffer */
1341 png_charp current_text_ptr
; /* current location in current_text */
1342 # endif /* PNG_TEXT_SUPPORTED */
1343 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1345 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1346 /* for the Borland special 64K segment handler */
1347 png_bytepp offset_table_ptr
;
1348 png_bytep offset_table
;
1349 png_uint_16 offset_table_number
;
1350 png_uint_16 offset_table_count
;
1351 png_uint_16 offset_table_count_free
;
1354 #if defined(PNG_READ_DITHER_SUPPORTED)
1355 png_bytep palette_lookup
; /* lookup table for dithering */
1356 png_bytep dither_index
; /* index translation for palette files */
1359 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1360 png_uint_16p hist
; /* histogram */
1363 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1364 png_byte heuristic_method
; /* heuristic for row filter selection */
1365 png_byte num_prev_filters
; /* number of weights for previous rows */
1366 png_bytep prev_filters
; /* filter type(s) of previous row(s) */
1367 png_uint_16p filter_weights
; /* weight(s) for previous line(s) */
1368 png_uint_16p inv_filter_weights
; /* 1/weight(s) for previous line(s) */
1369 png_uint_16p filter_costs
; /* relative filter calculation cost */
1370 png_uint_16p inv_filter_costs
; /* 1/relative filter calculation cost */
1373 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1374 png_charp time_buffer
; /* String to hold RFC 1123 time text */
1377 /* New members added in libpng-1.0.6 */
1379 #ifdef PNG_FREE_ME_SUPPORTED
1380 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
1383 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1384 png_voidp user_chunk_ptr
;
1385 png_user_chunk_ptr read_user_chunk_fn
; /* user read chunk handler */
1388 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1390 png_bytep chunk_list
;
1393 /* New members added in libpng-1.0.3 */
1394 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1395 png_byte rgb_to_gray_status
;
1396 /* These were changed from png_byte in libpng-1.0.6 */
1397 png_uint_16 rgb_to_gray_red_coeff
;
1398 png_uint_16 rgb_to_gray_green_coeff
;
1399 png_uint_16 rgb_to_gray_blue_coeff
;
1402 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1403 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1404 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1405 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1406 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1408 png_byte mng_features_permitted
;
1410 png_uint_32 mng_features_permitted
;
1411 #endif /* PNG_1_0_X */
1414 /* New member added in libpng-1.0.7 */
1415 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1416 png_fixed_point int_gamma
;
1419 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1420 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1421 png_byte filter_type
;
1424 #if defined(PNG_1_0_X)
1425 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1426 png_uint_32 row_buf_size
;
1429 /* New members added in libpng-1.2.0 */
1430 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1431 # if !defined(PNG_1_0_X)
1432 # if defined(PNG_MMX_CODE_SUPPORTED)
1433 png_byte mmx_bitdepth_threshold
;
1434 png_uint_32 mmx_rowbytes_threshold
;
1436 png_uint_32 asm_flags
;
1440 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1441 #ifdef PNG_USER_MEM_SUPPORTED
1442 png_voidp mem_ptr
; /* user supplied struct for mem functions */
1443 png_malloc_ptr malloc_fn
; /* function for allocating memory */
1444 png_free_ptr free_fn
; /* function for freeing memory */
1447 /* New member added in libpng-1.0.13 and 1.2.0 */
1448 png_bytep big_row_buf
; /* buffer to save current (unfiltered) row */
1450 #if defined(PNG_READ_DITHER_SUPPORTED)
1451 /* The following three members were added at version 1.0.14 and 1.2.4 */
1452 png_bytep dither_sort
; /* working sort array */
1453 png_bytep index_to_palette
; /* where the original index currently is */
1454 /* in the palette */
1455 png_bytep palette_to_index
; /* which original index points to this */
1459 /* New members added in libpng-1.0.16 and 1.2.6 */
1460 png_byte compression_type
;
1462 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1463 png_uint_32 user_width_max
;
1464 png_uint_32 user_height_max
;
1467 /* New member added in libpng-1.0.25 and 1.2.17 */
1468 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1469 /* storage for unknown chunk that the library doesn't recognize. */
1470 png_unknown_chunk unknown_chunk
;
1473 /* New members added in libpng-1.2.26 */
1474 png_uint_32 old_big_row_buf_size
, old_prev_row_size
;
1476 /* New member added in libpng-1.2.30 */
1477 png_charp chunkdata
; /* buffer for reading chunk data */
1482 /* This triggers a compiler error in png.c, if png.c and png.h
1483 * do not agree upon the version number.
1485 typedef png_structp version_1_2_34
;
1487 typedef png_struct FAR
* FAR
* png_structpp
;
1489 /* Here are the function definitions most commonly used. This is not
1490 * the place to find out how to use libpng. See libpng.txt for the
1491 * full explanation, see example.c for the summary. This just provides
1492 * a simple one line description of the use of each function.
1495 /* Returns the version number of the library */
1496 extern PNG_EXPORT(png_uint_32
,png_access_version_number
) PNGARG((void));
1498 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1499 * Handling more than 8 bytes from the beginning of the file is an error.
1501 extern PNG_EXPORT(void,png_set_sig_bytes
) PNGARG((png_structp png_ptr
,
1504 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1505 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1506 * signature, and non-zero otherwise. Having num_to_check == 0 or
1507 * start > 7 will always fail (ie return non-zero).
1509 extern PNG_EXPORT(int,png_sig_cmp
) PNGARG((png_bytep sig
, png_size_t start
,
1510 png_size_t num_to_check
));
1512 /* Simple signature checking function. This is the same as calling
1513 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1515 extern PNG_EXPORT(int,png_check_sig
) PNGARG((png_bytep sig
, int num
));
1517 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1518 extern PNG_EXPORT(png_structp
,png_create_read_struct
)
1519 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1520 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1522 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1523 extern PNG_EXPORT(png_structp
,png_create_write_struct
)
1524 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1525 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1527 #ifdef PNG_WRITE_SUPPORTED
1528 extern PNG_EXPORT(png_uint_32
,png_get_compression_buffer_size
)
1529 PNGARG((png_structp png_ptr
));
1532 #ifdef PNG_WRITE_SUPPORTED
1533 extern PNG_EXPORT(void,png_set_compression_buffer_size
)
1534 PNGARG((png_structp png_ptr
, png_uint_32 size
));
1537 /* Reset the compression stream */
1538 extern PNG_EXPORT(int,png_reset_zstream
) PNGARG((png_structp png_ptr
));
1540 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1541 #ifdef PNG_USER_MEM_SUPPORTED
1542 extern PNG_EXPORT(png_structp
,png_create_read_struct_2
)
1543 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1544 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1545 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1546 extern PNG_EXPORT(png_structp
,png_create_write_struct_2
)
1547 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1548 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1549 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1552 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1553 extern PNG_EXPORT(void,png_write_chunk
) PNGARG((png_structp png_ptr
,
1554 png_bytep chunk_name
, png_bytep data
, png_size_t length
));
1556 /* Write the start of a PNG chunk - length and chunk name. */
1557 extern PNG_EXPORT(void,png_write_chunk_start
) PNGARG((png_structp png_ptr
,
1558 png_bytep chunk_name
, png_uint_32 length
));
1560 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1561 extern PNG_EXPORT(void,png_write_chunk_data
) PNGARG((png_structp png_ptr
,
1562 png_bytep data
, png_size_t length
));
1564 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1565 extern PNG_EXPORT(void,png_write_chunk_end
) PNGARG((png_structp png_ptr
));
1567 /* Allocate and initialize the info structure */
1568 extern PNG_EXPORT(png_infop
,png_create_info_struct
)
1569 PNGARG((png_structp png_ptr
));
1571 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1572 /* Initialize the info structure (old interface - DEPRECATED) */
1573 extern PNG_EXPORT(void,png_info_init
) PNGARG((png_infop info_ptr
));
1574 #undef png_info_init
1575 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1576 png_sizeof(png_info));
1579 extern PNG_EXPORT(void,png_info_init_3
) PNGARG((png_infopp info_ptr
,
1580 png_size_t png_info_struct_size
));
1582 /* Writes all the PNG information before the image. */
1583 extern PNG_EXPORT(void,png_write_info_before_PLTE
) PNGARG((png_structp png_ptr
,
1584 png_infop info_ptr
));
1585 extern PNG_EXPORT(void,png_write_info
) PNGARG((png_structp png_ptr
,
1586 png_infop info_ptr
));
1588 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1589 /* read the information before the actual image data. */
1590 extern PNG_EXPORT(void,png_read_info
) PNGARG((png_structp png_ptr
,
1591 png_infop info_ptr
));
1594 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1595 extern PNG_EXPORT(png_charp
,png_convert_to_rfc1123
)
1596 PNGARG((png_structp png_ptr
, png_timep ptime
));
1599 #if !defined(_WIN32_WCE)
1600 /* "time.h" functions are not supported on WindowsCE */
1601 #if defined(PNG_WRITE_tIME_SUPPORTED)
1602 /* convert from a struct tm to png_time */
1603 extern PNG_EXPORT(void,png_convert_from_struct_tm
) PNGARG((png_timep ptime
,
1604 struct tm FAR
* ttime
));
1606 /* convert from time_t to png_time. Uses gmtime() */
1607 extern PNG_EXPORT(void,png_convert_from_time_t
) PNGARG((png_timep ptime
,
1609 #endif /* PNG_WRITE_tIME_SUPPORTED */
1610 #endif /* _WIN32_WCE */
1612 #if defined(PNG_READ_EXPAND_SUPPORTED)
1613 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1614 extern PNG_EXPORT(void,png_set_expand
) PNGARG((png_structp png_ptr
));
1615 #if !defined(PNG_1_0_X)
1616 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8
) PNGARG((png_structp
1619 extern PNG_EXPORT(void,png_set_palette_to_rgb
) PNGARG((png_structp png_ptr
));
1620 extern PNG_EXPORT(void,png_set_tRNS_to_alpha
) PNGARG((png_structp png_ptr
));
1621 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1623 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8
) PNGARG((png_structp png_ptr
));
1627 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1628 /* Use blue, green, red order for pixels. */
1629 extern PNG_EXPORT(void,png_set_bgr
) PNGARG((png_structp png_ptr
));
1632 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1633 /* Expand the grayscale to 24-bit RGB if necessary. */
1634 extern PNG_EXPORT(void,png_set_gray_to_rgb
) PNGARG((png_structp png_ptr
));
1637 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1638 /* Reduce RGB to grayscale. */
1639 #ifdef PNG_FLOATING_POINT_SUPPORTED
1640 extern PNG_EXPORT(void,png_set_rgb_to_gray
) PNGARG((png_structp png_ptr
,
1641 int error_action
, double red
, double green
));
1643 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed
) PNGARG((png_structp png_ptr
,
1644 int error_action
, png_fixed_point red
, png_fixed_point green
));
1645 extern PNG_EXPORT(png_byte
,png_get_rgb_to_gray_status
) PNGARG((png_structp
1649 extern PNG_EXPORT(void,png_build_grayscale_palette
) PNGARG((int bit_depth
,
1650 png_colorp palette
));
1652 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1653 extern PNG_EXPORT(void,png_set_strip_alpha
) PNGARG((png_structp png_ptr
));
1656 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1657 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1658 extern PNG_EXPORT(void,png_set_swap_alpha
) PNGARG((png_structp png_ptr
));
1661 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1662 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1663 extern PNG_EXPORT(void,png_set_invert_alpha
) PNGARG((png_structp png_ptr
));
1666 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1667 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1668 extern PNG_EXPORT(void,png_set_filler
) PNGARG((png_structp png_ptr
,
1669 png_uint_32 filler
, int flags
));
1670 /* The values of the PNG_FILLER_ defines should NOT be changed */
1671 #define PNG_FILLER_BEFORE 0
1672 #define PNG_FILLER_AFTER 1
1673 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1674 #if !defined(PNG_1_0_X)
1675 extern PNG_EXPORT(void,png_set_add_alpha
) PNGARG((png_structp png_ptr
,
1676 png_uint_32 filler
, int flags
));
1678 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1680 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1681 /* Swap bytes in 16-bit depth files. */
1682 extern PNG_EXPORT(void,png_set_swap
) PNGARG((png_structp png_ptr
));
1685 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1686 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1687 extern PNG_EXPORT(void,png_set_packing
) PNGARG((png_structp png_ptr
));
1690 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1691 /* Swap packing order of pixels in bytes. */
1692 extern PNG_EXPORT(void,png_set_packswap
) PNGARG((png_structp png_ptr
));
1695 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1696 /* Converts files to legal bit depths. */
1697 extern PNG_EXPORT(void,png_set_shift
) PNGARG((png_structp png_ptr
,
1698 png_color_8p true_bits
));
1701 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1702 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1703 /* Have the code handle the interlacing. Returns the number of passes. */
1704 extern PNG_EXPORT(int,png_set_interlace_handling
) PNGARG((png_structp png_ptr
));
1707 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1708 /* Invert monochrome files */
1709 extern PNG_EXPORT(void,png_set_invert_mono
) PNGARG((png_structp png_ptr
));
1712 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1713 /* Handle alpha and tRNS by replacing with a background color. */
1714 #ifdef PNG_FLOATING_POINT_SUPPORTED
1715 extern PNG_EXPORT(void,png_set_background
) PNGARG((png_structp png_ptr
,
1716 png_color_16p background_color
, int background_gamma_code
,
1717 int need_expand
, double background_gamma
));
1719 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1720 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1721 #define PNG_BACKGROUND_GAMMA_FILE 2
1722 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1725 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1726 /* strip the second byte of information from a 16-bit depth file. */
1727 extern PNG_EXPORT(void,png_set_strip_16
) PNGARG((png_structp png_ptr
));
1730 #if defined(PNG_READ_DITHER_SUPPORTED)
1731 /* Turn on dithering, and reduce the palette to the number of colors available. */
1732 extern PNG_EXPORT(void,png_set_dither
) PNGARG((png_structp png_ptr
,
1733 png_colorp palette
, int num_palette
, int maximum_colors
,
1734 png_uint_16p histogram
, int full_dither
));
1737 #if defined(PNG_READ_GAMMA_SUPPORTED)
1738 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1739 #ifdef PNG_FLOATING_POINT_SUPPORTED
1740 extern PNG_EXPORT(void,png_set_gamma
) PNGARG((png_structp png_ptr
,
1741 double screen_gamma
, double default_file_gamma
));
1745 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1746 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1747 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1748 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1749 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1750 extern PNG_EXPORT(void,png_permit_empty_plte
) PNGARG((png_structp png_ptr
,
1751 int empty_plte_permitted
));
1755 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1756 /* Set how many lines between output flushes - 0 for no flushing */
1757 extern PNG_EXPORT(void,png_set_flush
) PNGARG((png_structp png_ptr
, int nrows
));
1758 /* Flush the current PNG output buffer */
1759 extern PNG_EXPORT(void,png_write_flush
) PNGARG((png_structp png_ptr
));
1762 /* optional update palette with requested transformations */
1763 extern PNG_EXPORT(void,png_start_read_image
) PNGARG((png_structp png_ptr
));
1765 /* optional call to update the users info structure */
1766 extern PNG_EXPORT(void,png_read_update_info
) PNGARG((png_structp png_ptr
,
1767 png_infop info_ptr
));
1769 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1770 /* read one or more rows of image data. */
1771 extern PNG_EXPORT(void,png_read_rows
) PNGARG((png_structp png_ptr
,
1772 png_bytepp row
, png_bytepp display_row
, png_uint_32 num_rows
));
1775 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1776 /* read a row of data. */
1777 extern PNG_EXPORT(void,png_read_row
) PNGARG((png_structp png_ptr
,
1779 png_bytep display_row
));
1782 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1783 /* read the whole image into memory at once. */
1784 extern PNG_EXPORT(void,png_read_image
) PNGARG((png_structp png_ptr
,
1788 /* write a row of image data */
1789 extern PNG_EXPORT(void,png_write_row
) PNGARG((png_structp png_ptr
,
1792 /* write a few rows of image data */
1793 extern PNG_EXPORT(void,png_write_rows
) PNGARG((png_structp png_ptr
,
1794 png_bytepp row
, png_uint_32 num_rows
));
1796 /* write the image data */
1797 extern PNG_EXPORT(void,png_write_image
) PNGARG((png_structp png_ptr
,
1800 /* writes the end of the PNG file. */
1801 extern PNG_EXPORT(void,png_write_end
) PNGARG((png_structp png_ptr
,
1802 png_infop info_ptr
));
1804 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1805 /* read the end of the PNG file. */
1806 extern PNG_EXPORT(void,png_read_end
) PNGARG((png_structp png_ptr
,
1807 png_infop info_ptr
));
1810 /* free any memory associated with the png_info_struct */
1811 extern PNG_EXPORT(void,png_destroy_info_struct
) PNGARG((png_structp png_ptr
,
1812 png_infopp info_ptr_ptr
));
1814 /* free any memory associated with the png_struct and the png_info_structs */
1815 extern PNG_EXPORT(void,png_destroy_read_struct
) PNGARG((png_structpp
1816 png_ptr_ptr
, png_infopp info_ptr_ptr
, png_infopp end_info_ptr_ptr
));
1818 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1819 extern void png_read_destroy
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
1820 png_infop end_info_ptr
));
1822 /* free any memory associated with the png_struct and the png_info_structs */
1823 extern PNG_EXPORT(void,png_destroy_write_struct
)
1824 PNGARG((png_structpp png_ptr_ptr
, png_infopp info_ptr_ptr
));
1826 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1827 extern void png_write_destroy
PNGARG((png_structp png_ptr
));
1829 /* set the libpng method of handling chunk CRC errors */
1830 extern PNG_EXPORT(void,png_set_crc_action
) PNGARG((png_structp png_ptr
,
1831 int crit_action
, int ancil_action
));
1833 /* Values for png_set_crc_action() to say how to handle CRC errors in
1834 * ancillary and critical chunks, and whether to use the data contained
1835 * therein. Note that it is impossible to "discard" data in a critical
1836 * chunk. For versions prior to 0.90, the action was always error/quit,
1837 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1838 * chunks is warn/discard. These values should NOT be changed.
1840 * value action:critical action:ancillary
1842 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1843 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1844 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1845 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1846 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1847 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1849 /* These functions give the user control over the scan-line filtering in
1850 * libpng and the compression methods used by zlib. These functions are
1851 * mainly useful for testing, as the defaults should work with most users.
1852 * Those users who are tight on memory or want faster performance at the
1853 * expense of compression can modify them. See the compression library
1854 * header file (zlib.h) for an explination of the compression functions.
1857 /* set the filtering method(s) used by libpng. Currently, the only valid
1858 * value for "method" is 0.
1860 extern PNG_EXPORT(void,png_set_filter
) PNGARG((png_structp png_ptr
, int method
,
1863 /* Flags for png_set_filter() to say which filters to use. The flags
1864 * are chosen so that they don't conflict with real filter types
1865 * below, in case they are supplied instead of the #defined constants.
1866 * These values should NOT be changed.
1868 #define PNG_NO_FILTERS 0x00
1869 #define PNG_FILTER_NONE 0x08
1870 #define PNG_FILTER_SUB 0x10
1871 #define PNG_FILTER_UP 0x20
1872 #define PNG_FILTER_AVG 0x40
1873 #define PNG_FILTER_PAETH 0x80
1874 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1875 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1877 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1878 * These defines should NOT be changed.
1880 #define PNG_FILTER_VALUE_NONE 0
1881 #define PNG_FILTER_VALUE_SUB 1
1882 #define PNG_FILTER_VALUE_UP 2
1883 #define PNG_FILTER_VALUE_AVG 3
1884 #define PNG_FILTER_VALUE_PAETH 4
1885 #define PNG_FILTER_VALUE_LAST 5
1887 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1888 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1889 * defines, either the default (minimum-sum-of-absolute-differences), or
1890 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1892 * Weights are factors >= 1.0, indicating how important it is to keep the
1893 * filter type consistent between rows. Larger numbers mean the current
1894 * filter is that many times as likely to be the same as the "num_weights"
1895 * previous filters. This is cumulative for each previous row with a weight.
1896 * There needs to be "num_weights" values in "filter_weights", or it can be
1897 * NULL if the weights aren't being specified. Weights have no influence on
1898 * the selection of the first row filter. Well chosen weights can (in theory)
1899 * improve the compression for a given image.
1901 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1902 * filter type. Higher costs indicate more decoding expense, and are
1903 * therefore less likely to be selected over a filter with lower computational
1904 * costs. There needs to be a value in "filter_costs" for each valid filter
1905 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1906 * setting the costs. Costs try to improve the speed of decompression without
1907 * unduly increasing the compressed image size.
1909 * A negative weight or cost indicates the default value is to be used, and
1910 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1911 * The default values for both weights and costs are currently 1.0, but may
1912 * change if good general weighting/cost heuristics can be found. If both
1913 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1914 * to the UNWEIGHTED method, but with added encoding time/computation.
1916 #ifdef PNG_FLOATING_POINT_SUPPORTED
1917 extern PNG_EXPORT(void,png_set_filter_heuristics
) PNGARG((png_structp png_ptr
,
1918 int heuristic_method
, int num_weights
, png_doublep filter_weights
,
1919 png_doublep filter_costs
));
1921 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1923 /* Heuristic used for row filter selection. These defines should NOT be
1926 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1927 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1928 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1929 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1931 /* Set the library compression level. Currently, valid values range from
1932 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1933 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1934 * shown that zlib compression levels 3-6 usually perform as well as level 9
1935 * for PNG images, and do considerably fewer caclulations. In the future,
1936 * these values may not correspond directly to the zlib compression levels.
1938 extern PNG_EXPORT(void,png_set_compression_level
) PNGARG((png_structp png_ptr
,
1941 extern PNG_EXPORT(void,png_set_compression_mem_level
)
1942 PNGARG((png_structp png_ptr
, int mem_level
));
1944 extern PNG_EXPORT(void,png_set_compression_strategy
)
1945 PNGARG((png_structp png_ptr
, int strategy
));
1947 extern PNG_EXPORT(void,png_set_compression_window_bits
)
1948 PNGARG((png_structp png_ptr
, int window_bits
));
1950 extern PNG_EXPORT(void,png_set_compression_method
) PNGARG((png_structp png_ptr
,
1953 /* These next functions are called for input/output, memory, and error
1954 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1955 * and call standard C I/O routines such as fread(), fwrite(), and
1956 * fprintf(). These functions can be made to use other I/O routines
1957 * at run time for those applications that need to handle I/O in a
1958 * different manner by calling png_set_???_fn(). See libpng.txt for
1962 #if !defined(PNG_NO_STDIO)
1963 /* Initialize the input/output for the PNG file to the default functions. */
1964 extern PNG_EXPORT(void,png_init_io
) PNGARG((png_structp png_ptr
, png_FILE_p fp
));
1967 /* Replace the (error and abort), and warning functions with user
1968 * supplied functions. If no messages are to be printed you must still
1969 * write and use replacement functions. The replacement error_fn should
1970 * still do a longjmp to the last setjmp location if you are using this
1971 * method of error handling. If error_fn or warning_fn is NULL, the
1972 * default function will be used.
1975 extern PNG_EXPORT(void,png_set_error_fn
) PNGARG((png_structp png_ptr
,
1976 png_voidp error_ptr
, png_error_ptr error_fn
, png_error_ptr warning_fn
));
1978 /* Return the user pointer associated with the error functions */
1979 extern PNG_EXPORT(png_voidp
,png_get_error_ptr
) PNGARG((png_structp png_ptr
));
1981 /* Replace the default data output functions with a user supplied one(s).
1982 * If buffered output is not used, then output_flush_fn can be set to NULL.
1983 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1984 * output_flush_fn will be ignored (and thus can be NULL).
1986 extern PNG_EXPORT(void,png_set_write_fn
) PNGARG((png_structp png_ptr
,
1987 png_voidp io_ptr
, png_rw_ptr write_data_fn
, png_flush_ptr output_flush_fn
));
1989 /* Replace the default data input function with a user supplied one. */
1990 extern PNG_EXPORT(void,png_set_read_fn
) PNGARG((png_structp png_ptr
,
1991 png_voidp io_ptr
, png_rw_ptr read_data_fn
));
1993 /* Return the user pointer associated with the I/O functions */
1994 extern PNG_EXPORT(png_voidp
,png_get_io_ptr
) PNGARG((png_structp png_ptr
));
1996 extern PNG_EXPORT(void,png_set_read_status_fn
) PNGARG((png_structp png_ptr
,
1997 png_read_status_ptr read_row_fn
));
1999 extern PNG_EXPORT(void,png_set_write_status_fn
) PNGARG((png_structp png_ptr
,
2000 png_write_status_ptr write_row_fn
));
2002 #ifdef PNG_USER_MEM_SUPPORTED
2003 /* Replace the default memory allocation functions with user supplied one(s). */
2004 extern PNG_EXPORT(void,png_set_mem_fn
) PNGARG((png_structp png_ptr
,
2005 png_voidp mem_ptr
, png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
2006 /* Return the user pointer associated with the memory functions */
2007 extern PNG_EXPORT(png_voidp
,png_get_mem_ptr
) PNGARG((png_structp png_ptr
));
2010 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2011 defined(PNG_LEGACY_SUPPORTED)
2012 extern PNG_EXPORT(void,png_set_read_user_transform_fn
) PNGARG((png_structp
2013 png_ptr
, png_user_transform_ptr read_user_transform_fn
));
2016 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2017 defined(PNG_LEGACY_SUPPORTED)
2018 extern PNG_EXPORT(void,png_set_write_user_transform_fn
) PNGARG((png_structp
2019 png_ptr
, png_user_transform_ptr write_user_transform_fn
));
2022 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2023 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2024 defined(PNG_LEGACY_SUPPORTED)
2025 extern PNG_EXPORT(void,png_set_user_transform_info
) PNGARG((png_structp
2026 png_ptr
, png_voidp user_transform_ptr
, int user_transform_depth
,
2027 int user_transform_channels
));
2028 /* Return the user pointer associated with the user transform functions */
2029 extern PNG_EXPORT(png_voidp
,png_get_user_transform_ptr
)
2030 PNGARG((png_structp png_ptr
));
2033 #ifdef PNG_USER_CHUNKS_SUPPORTED
2034 extern PNG_EXPORT(void,png_set_read_user_chunk_fn
) PNGARG((png_structp png_ptr
,
2035 png_voidp user_chunk_ptr
, png_user_chunk_ptr read_user_chunk_fn
));
2036 extern PNG_EXPORT(png_voidp
,png_get_user_chunk_ptr
) PNGARG((png_structp
2040 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2041 /* Sets the function callbacks for the push reader, and a pointer to a
2042 * user-defined structure available to the callback functions.
2044 extern PNG_EXPORT(void,png_set_progressive_read_fn
) PNGARG((png_structp png_ptr
,
2045 png_voidp progressive_ptr
,
2046 png_progressive_info_ptr info_fn
, png_progressive_row_ptr row_fn
,
2047 png_progressive_end_ptr end_fn
));
2049 /* returns the user pointer associated with the push read functions */
2050 extern PNG_EXPORT(png_voidp
,png_get_progressive_ptr
)
2051 PNGARG((png_structp png_ptr
));
2053 /* function to be called when data becomes available */
2054 extern PNG_EXPORT(void,png_process_data
) PNGARG((png_structp png_ptr
,
2055 png_infop info_ptr
, png_bytep buffer
, png_size_t buffer_size
));
2057 /* function that combines rows. Not very much different than the
2058 * png_combine_row() call. Is this even used?????
2060 extern PNG_EXPORT(void,png_progressive_combine_row
) PNGARG((png_structp png_ptr
,
2061 png_bytep old_row
, png_bytep new_row
));
2062 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2064 extern PNG_EXPORT(png_voidp
,png_malloc
) PNGARG((png_structp png_ptr
,
2067 #if defined(PNG_1_0_X)
2068 # define png_malloc_warn png_malloc
2070 /* Added at libpng version 1.2.4 */
2071 extern PNG_EXPORT(png_voidp
,png_malloc_warn
) PNGARG((png_structp png_ptr
,
2075 /* frees a pointer allocated by png_malloc() */
2076 extern PNG_EXPORT(void,png_free
) PNGARG((png_structp png_ptr
, png_voidp ptr
));
2078 #if defined(PNG_1_0_X)
2079 /* Function to allocate memory for zlib. */
2080 extern PNG_EXPORT(voidpf
,png_zalloc
) PNGARG((voidpf png_ptr
, uInt items
,
2083 /* Function to free memory for zlib */
2084 extern PNG_EXPORT(void,png_zfree
) PNGARG((voidpf png_ptr
, voidpf ptr
));
2087 /* Free data that was allocated internally */
2088 extern PNG_EXPORT(void,png_free_data
) PNGARG((png_structp png_ptr
,
2089 png_infop info_ptr
, png_uint_32 free_me
, int num
));
2090 #ifdef PNG_FREE_ME_SUPPORTED
2091 /* Reassign responsibility for freeing existing data, whether allocated
2092 * by libpng or by the application */
2093 extern PNG_EXPORT(void,png_data_freer
) PNGARG((png_structp png_ptr
,
2094 png_infop info_ptr
, int freer
, png_uint_32 mask
));
2096 /* assignments for png_data_freer */
2097 #define PNG_DESTROY_WILL_FREE_DATA 1
2098 #define PNG_SET_WILL_FREE_DATA 1
2099 #define PNG_USER_WILL_FREE_DATA 2
2100 /* Flags for png_ptr->free_me and info_ptr->free_me */
2101 #define PNG_FREE_HIST 0x0008
2102 #define PNG_FREE_ICCP 0x0010
2103 #define PNG_FREE_SPLT 0x0020
2104 #define PNG_FREE_ROWS 0x0040
2105 #define PNG_FREE_PCAL 0x0080
2106 #define PNG_FREE_SCAL 0x0100
2107 #define PNG_FREE_UNKN 0x0200
2108 #define PNG_FREE_LIST 0x0400
2109 #define PNG_FREE_PLTE 0x1000
2110 #define PNG_FREE_TRNS 0x2000
2111 #define PNG_FREE_TEXT 0x4000
2112 #define PNG_FREE_ALL 0x7fff
2113 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2115 #ifdef PNG_USER_MEM_SUPPORTED
2116 extern PNG_EXPORT(png_voidp
,png_malloc_default
) PNGARG((png_structp png_ptr
,
2118 extern PNG_EXPORT(void,png_free_default
) PNGARG((png_structp png_ptr
,
2122 extern PNG_EXPORT(png_voidp
,png_memcpy_check
) PNGARG((png_structp png_ptr
,
2123 png_voidp s1
, png_voidp s2
, png_uint_32 size
));
2125 extern PNG_EXPORT(png_voidp
,png_memset_check
) PNGARG((png_structp png_ptr
,
2126 png_voidp s1
, int value
, png_uint_32 size
));
2128 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2129 extern void *png_far_to_near
PNGARG((png_structp png_ptr
,png_voidp ptr
,
2131 #endif /* USE_FAR_KEYWORD */
2133 #ifndef PNG_NO_ERROR_TEXT
2134 /* Fatal error in PNG image of libpng - can't continue */
2135 extern PNG_EXPORT(void,png_error
) PNGARG((png_structp png_ptr
,
2136 png_const_charp error_message
));
2138 /* The same, but the chunk name is prepended to the error string. */
2139 extern PNG_EXPORT(void,png_chunk_error
) PNGARG((png_structp png_ptr
,
2140 png_const_charp error_message
));
2142 /* Fatal error in PNG image of libpng - can't continue */
2143 extern PNG_EXPORT(void,png_err
) PNGARG((png_structp png_ptr
));
2146 #ifndef PNG_NO_WARNINGS
2147 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2148 extern PNG_EXPORT(void,png_warning
) PNGARG((png_structp png_ptr
,
2149 png_const_charp warning_message
));
2151 #ifdef PNG_READ_SUPPORTED
2152 /* Non-fatal error in libpng, chunk name is prepended to message. */
2153 extern PNG_EXPORT(void,png_chunk_warning
) PNGARG((png_structp png_ptr
,
2154 png_const_charp warning_message
));
2155 #endif /* PNG_READ_SUPPORTED */
2156 #endif /* PNG_NO_WARNINGS */
2158 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2159 * Similarly, the png_get_<chunk> calls are used to read values from the
2160 * png_info_struct, either storing the parameters in the passed variables, or
2161 * setting pointers into the png_info_struct where the data is stored. The
2162 * png_get_<chunk> functions return a non-zero value if the data was available
2163 * in info_ptr, or return zero and do not change any of the parameters if the
2164 * data was not available.
2166 * These functions should be used instead of directly accessing png_info
2167 * to avoid problems with future changes in the size and internal layout of
2170 /* Returns "flag" if chunk data is valid in info_ptr. */
2171 extern PNG_EXPORT(png_uint_32
,png_get_valid
) PNGARG((png_structp png_ptr
,
2172 png_infop info_ptr
, png_uint_32 flag
));
2174 /* Returns number of bytes needed to hold a transformed row. */
2175 extern PNG_EXPORT(png_uint_32
,png_get_rowbytes
) PNGARG((png_structp png_ptr
,
2176 png_infop info_ptr
));
2178 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2179 /* Returns row_pointers, which is an array of pointers to scanlines that was
2180 returned from png_read_png(). */
2181 extern PNG_EXPORT(png_bytepp
,png_get_rows
) PNGARG((png_structp png_ptr
,
2182 png_infop info_ptr
));
2183 /* Set row_pointers, which is an array of pointers to scanlines for use
2184 by png_write_png(). */
2185 extern PNG_EXPORT(void,png_set_rows
) PNGARG((png_structp png_ptr
,
2186 png_infop info_ptr
, png_bytepp row_pointers
));
2189 /* Returns number of color channels in image. */
2190 extern PNG_EXPORT(png_byte
,png_get_channels
) PNGARG((png_structp png_ptr
,
2191 png_infop info_ptr
));
2193 #ifdef PNG_EASY_ACCESS_SUPPORTED
2194 /* Returns image width in pixels. */
2195 extern PNG_EXPORT(png_uint_32
, png_get_image_width
) PNGARG((png_structp
2196 png_ptr
, png_infop info_ptr
));
2198 /* Returns image height in pixels. */
2199 extern PNG_EXPORT(png_uint_32
, png_get_image_height
) PNGARG((png_structp
2200 png_ptr
, png_infop info_ptr
));
2202 /* Returns image bit_depth. */
2203 extern PNG_EXPORT(png_byte
, png_get_bit_depth
) PNGARG((png_structp
2204 png_ptr
, png_infop info_ptr
));
2206 /* Returns image color_type. */
2207 extern PNG_EXPORT(png_byte
, png_get_color_type
) PNGARG((png_structp
2208 png_ptr
, png_infop info_ptr
));
2210 /* Returns image filter_type. */
2211 extern PNG_EXPORT(png_byte
, png_get_filter_type
) PNGARG((png_structp
2212 png_ptr
, png_infop info_ptr
));
2214 /* Returns image interlace_type. */
2215 extern PNG_EXPORT(png_byte
, png_get_interlace_type
) PNGARG((png_structp
2216 png_ptr
, png_infop info_ptr
));
2218 /* Returns image compression_type. */
2219 extern PNG_EXPORT(png_byte
, png_get_compression_type
) PNGARG((png_structp
2220 png_ptr
, png_infop info_ptr
));
2222 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2223 extern PNG_EXPORT(png_uint_32
, png_get_pixels_per_meter
) PNGARG((png_structp
2224 png_ptr
, png_infop info_ptr
));
2225 extern PNG_EXPORT(png_uint_32
, png_get_x_pixels_per_meter
) PNGARG((png_structp
2226 png_ptr
, png_infop info_ptr
));
2227 extern PNG_EXPORT(png_uint_32
, png_get_y_pixels_per_meter
) PNGARG((png_structp
2228 png_ptr
, png_infop info_ptr
));
2230 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2231 #ifdef PNG_FLOATING_POINT_SUPPORTED
2232 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio
) PNGARG((png_structp
2233 png_ptr
, png_infop info_ptr
));
2236 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2237 extern PNG_EXPORT(png_int_32
, png_get_x_offset_pixels
) PNGARG((png_structp
2238 png_ptr
, png_infop info_ptr
));
2239 extern PNG_EXPORT(png_int_32
, png_get_y_offset_pixels
) PNGARG((png_structp
2240 png_ptr
, png_infop info_ptr
));
2241 extern PNG_EXPORT(png_int_32
, png_get_x_offset_microns
) PNGARG((png_structp
2242 png_ptr
, png_infop info_ptr
));
2243 extern PNG_EXPORT(png_int_32
, png_get_y_offset_microns
) PNGARG((png_structp
2244 png_ptr
, png_infop info_ptr
));
2246 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2248 /* Returns pointer to signature string read from PNG header */
2249 extern PNG_EXPORT(png_bytep
,png_get_signature
) PNGARG((png_structp png_ptr
,
2250 png_infop info_ptr
));
2252 #if defined(PNG_bKGD_SUPPORTED)
2253 extern PNG_EXPORT(png_uint_32
,png_get_bKGD
) PNGARG((png_structp png_ptr
,
2254 png_infop info_ptr
, png_color_16p
*background
));
2257 #if defined(PNG_bKGD_SUPPORTED)
2258 extern PNG_EXPORT(void,png_set_bKGD
) PNGARG((png_structp png_ptr
,
2259 png_infop info_ptr
, png_color_16p background
));
2262 #if defined(PNG_cHRM_SUPPORTED)
2263 #ifdef PNG_FLOATING_POINT_SUPPORTED
2264 extern PNG_EXPORT(png_uint_32
,png_get_cHRM
) PNGARG((png_structp png_ptr
,
2265 png_infop info_ptr
, double *white_x
, double *white_y
, double *red_x
,
2266 double *red_y
, double *green_x
, double *green_y
, double *blue_x
,
2269 #ifdef PNG_FIXED_POINT_SUPPORTED
2270 extern PNG_EXPORT(png_uint_32
,png_get_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2271 png_infop info_ptr
, png_fixed_point
*int_white_x
, png_fixed_point
2272 *int_white_y
, png_fixed_point
*int_red_x
, png_fixed_point
*int_red_y
,
2273 png_fixed_point
*int_green_x
, png_fixed_point
*int_green_y
, png_fixed_point
2274 *int_blue_x
, png_fixed_point
*int_blue_y
));
2278 #if defined(PNG_cHRM_SUPPORTED)
2279 #ifdef PNG_FLOATING_POINT_SUPPORTED
2280 extern PNG_EXPORT(void,png_set_cHRM
) PNGARG((png_structp png_ptr
,
2281 png_infop info_ptr
, double white_x
, double white_y
, double red_x
,
2282 double red_y
, double green_x
, double green_y
, double blue_x
, double blue_y
));
2284 #ifdef PNG_FIXED_POINT_SUPPORTED
2285 extern PNG_EXPORT(void,png_set_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2286 png_infop info_ptr
, png_fixed_point int_white_x
, png_fixed_point int_white_y
,
2287 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
2288 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
2289 png_fixed_point int_blue_y
));
2293 #if defined(PNG_gAMA_SUPPORTED)
2294 #ifdef PNG_FLOATING_POINT_SUPPORTED
2295 extern PNG_EXPORT(png_uint_32
,png_get_gAMA
) PNGARG((png_structp png_ptr
,
2296 png_infop info_ptr
, double *file_gamma
));
2298 extern PNG_EXPORT(png_uint_32
,png_get_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2299 png_infop info_ptr
, png_fixed_point
*int_file_gamma
));
2302 #if defined(PNG_gAMA_SUPPORTED)
2303 #ifdef PNG_FLOATING_POINT_SUPPORTED
2304 extern PNG_EXPORT(void,png_set_gAMA
) PNGARG((png_structp png_ptr
,
2305 png_infop info_ptr
, double file_gamma
));
2307 extern PNG_EXPORT(void,png_set_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2308 png_infop info_ptr
, png_fixed_point int_file_gamma
));
2311 #if defined(PNG_hIST_SUPPORTED)
2312 extern PNG_EXPORT(png_uint_32
,png_get_hIST
) PNGARG((png_structp png_ptr
,
2313 png_infop info_ptr
, png_uint_16p
*hist
));
2316 #if defined(PNG_hIST_SUPPORTED)
2317 extern PNG_EXPORT(void,png_set_hIST
) PNGARG((png_structp png_ptr
,
2318 png_infop info_ptr
, png_uint_16p hist
));
2321 extern PNG_EXPORT(png_uint_32
,png_get_IHDR
) PNGARG((png_structp png_ptr
,
2322 png_infop info_ptr
, png_uint_32
*width
, png_uint_32
*height
,
2323 int *bit_depth
, int *color_type
, int *interlace_method
,
2324 int *compression_method
, int *filter_method
));
2326 extern PNG_EXPORT(void,png_set_IHDR
) PNGARG((png_structp png_ptr
,
2327 png_infop info_ptr
, png_uint_32 width
, png_uint_32 height
, int bit_depth
,
2328 int color_type
, int interlace_method
, int compression_method
,
2329 int filter_method
));
2331 #if defined(PNG_oFFs_SUPPORTED)
2332 extern PNG_EXPORT(png_uint_32
,png_get_oFFs
) PNGARG((png_structp png_ptr
,
2333 png_infop info_ptr
, png_int_32
*offset_x
, png_int_32
*offset_y
,
2337 #if defined(PNG_oFFs_SUPPORTED)
2338 extern PNG_EXPORT(void,png_set_oFFs
) PNGARG((png_structp png_ptr
,
2339 png_infop info_ptr
, png_int_32 offset_x
, png_int_32 offset_y
,
2343 #if defined(PNG_pCAL_SUPPORTED)
2344 extern PNG_EXPORT(png_uint_32
,png_get_pCAL
) PNGARG((png_structp png_ptr
,
2345 png_infop info_ptr
, png_charp
*purpose
, png_int_32
*X0
, png_int_32
*X1
,
2346 int *type
, int *nparams
, png_charp
*units
, png_charpp
*params
));
2349 #if defined(PNG_pCAL_SUPPORTED)
2350 extern PNG_EXPORT(void,png_set_pCAL
) PNGARG((png_structp png_ptr
,
2351 png_infop info_ptr
, png_charp purpose
, png_int_32 X0
, png_int_32 X1
,
2352 int type
, int nparams
, png_charp units
, png_charpp params
));
2355 #if defined(PNG_pHYs_SUPPORTED)
2356 extern PNG_EXPORT(png_uint_32
,png_get_pHYs
) PNGARG((png_structp png_ptr
,
2357 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
2360 #if defined(PNG_pHYs_SUPPORTED)
2361 extern PNG_EXPORT(void,png_set_pHYs
) PNGARG((png_structp png_ptr
,
2362 png_infop info_ptr
, png_uint_32 res_x
, png_uint_32 res_y
, int unit_type
));
2365 extern PNG_EXPORT(png_uint_32
,png_get_PLTE
) PNGARG((png_structp png_ptr
,
2366 png_infop info_ptr
, png_colorp
*palette
, int *num_palette
));
2368 extern PNG_EXPORT(void,png_set_PLTE
) PNGARG((png_structp png_ptr
,
2369 png_infop info_ptr
, png_colorp palette
, int num_palette
));
2371 #if defined(PNG_sBIT_SUPPORTED)
2372 extern PNG_EXPORT(png_uint_32
,png_get_sBIT
) PNGARG((png_structp png_ptr
,
2373 png_infop info_ptr
, png_color_8p
*sig_bit
));
2376 #if defined(PNG_sBIT_SUPPORTED)
2377 extern PNG_EXPORT(void,png_set_sBIT
) PNGARG((png_structp png_ptr
,
2378 png_infop info_ptr
, png_color_8p sig_bit
));
2381 #if defined(PNG_sRGB_SUPPORTED)
2382 extern PNG_EXPORT(png_uint_32
,png_get_sRGB
) PNGARG((png_structp png_ptr
,
2383 png_infop info_ptr
, int *intent
));
2386 #if defined(PNG_sRGB_SUPPORTED)
2387 extern PNG_EXPORT(void,png_set_sRGB
) PNGARG((png_structp png_ptr
,
2388 png_infop info_ptr
, int intent
));
2389 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM
) PNGARG((png_structp png_ptr
,
2390 png_infop info_ptr
, int intent
));
2393 #if defined(PNG_iCCP_SUPPORTED)
2394 extern PNG_EXPORT(png_uint_32
,png_get_iCCP
) PNGARG((png_structp png_ptr
,
2395 png_infop info_ptr
, png_charpp name
, int *compression_type
,
2396 png_charpp profile
, png_uint_32
*proflen
));
2397 /* Note to maintainer: profile should be png_bytepp */
2400 #if defined(PNG_iCCP_SUPPORTED)
2401 extern PNG_EXPORT(void,png_set_iCCP
) PNGARG((png_structp png_ptr
,
2402 png_infop info_ptr
, png_charp name
, int compression_type
,
2403 png_charp profile
, png_uint_32 proflen
));
2404 /* Note to maintainer: profile should be png_bytep */
2407 #if defined(PNG_sPLT_SUPPORTED)
2408 extern PNG_EXPORT(png_uint_32
,png_get_sPLT
) PNGARG((png_structp png_ptr
,
2409 png_infop info_ptr
, png_sPLT_tpp entries
));
2412 #if defined(PNG_sPLT_SUPPORTED)
2413 extern PNG_EXPORT(void,png_set_sPLT
) PNGARG((png_structp png_ptr
,
2414 png_infop info_ptr
, png_sPLT_tp entries
, int nentries
));
2417 #if defined(PNG_TEXT_SUPPORTED)
2418 /* png_get_text also returns the number of text chunks in *num_text */
2419 extern PNG_EXPORT(png_uint_32
,png_get_text
) PNGARG((png_structp png_ptr
,
2420 png_infop info_ptr
, png_textp
*text_ptr
, int *num_text
));
2424 * Note while png_set_text() will accept a structure whose text,
2425 * language, and translated keywords are NULL pointers, the structure
2426 * returned by png_get_text will always contain regular
2427 * zero-terminated C strings. They might be empty strings but
2428 * they will never be NULL pointers.
2431 #if defined(PNG_TEXT_SUPPORTED)
2432 extern PNG_EXPORT(void,png_set_text
) PNGARG((png_structp png_ptr
,
2433 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
2436 #if defined(PNG_tIME_SUPPORTED)
2437 extern PNG_EXPORT(png_uint_32
,png_get_tIME
) PNGARG((png_structp png_ptr
,
2438 png_infop info_ptr
, png_timep
*mod_time
));
2441 #if defined(PNG_tIME_SUPPORTED)
2442 extern PNG_EXPORT(void,png_set_tIME
) PNGARG((png_structp png_ptr
,
2443 png_infop info_ptr
, png_timep mod_time
));
2446 #if defined(PNG_tRNS_SUPPORTED)
2447 extern PNG_EXPORT(png_uint_32
,png_get_tRNS
) PNGARG((png_structp png_ptr
,
2448 png_infop info_ptr
, png_bytep
*trans
, int *num_trans
,
2449 png_color_16p
*trans_values
));
2452 #if defined(PNG_tRNS_SUPPORTED)
2453 extern PNG_EXPORT(void,png_set_tRNS
) PNGARG((png_structp png_ptr
,
2454 png_infop info_ptr
, png_bytep trans
, int num_trans
,
2455 png_color_16p trans_values
));
2458 #if defined(PNG_tRNS_SUPPORTED)
2461 #if defined(PNG_sCAL_SUPPORTED)
2462 #ifdef PNG_FLOATING_POINT_SUPPORTED
2463 extern PNG_EXPORT(png_uint_32
,png_get_sCAL
) PNGARG((png_structp png_ptr
,
2464 png_infop info_ptr
, int *unit
, double *width
, double *height
));
2466 #ifdef PNG_FIXED_POINT_SUPPORTED
2467 extern PNG_EXPORT(png_uint_32
,png_get_sCAL_s
) PNGARG((png_structp png_ptr
,
2468 png_infop info_ptr
, int *unit
, png_charpp swidth
, png_charpp sheight
));
2471 #endif /* PNG_sCAL_SUPPORTED */
2473 #if defined(PNG_sCAL_SUPPORTED)
2474 #ifdef PNG_FLOATING_POINT_SUPPORTED
2475 extern PNG_EXPORT(void,png_set_sCAL
) PNGARG((png_structp png_ptr
,
2476 png_infop info_ptr
, int unit
, double width
, double height
));
2478 #ifdef PNG_FIXED_POINT_SUPPORTED
2479 extern PNG_EXPORT(void,png_set_sCAL_s
) PNGARG((png_structp png_ptr
,
2480 png_infop info_ptr
, int unit
, png_charp swidth
, png_charp sheight
));
2483 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2485 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2486 /* provide a list of chunks and how they are to be handled, if the built-in
2487 handling or default unknown chunk handling is not desired. Any chunks not
2488 listed will be handled in the default manner. The IHDR and IEND chunks
2490 keep = 0: follow default behaviour
2492 = 2: keep only if safe-to-copy
2493 = 3: keep even if unsafe-to-copy
2495 extern PNG_EXPORT(void, png_set_keep_unknown_chunks
) PNGARG((png_structp
2496 png_ptr
, int keep
, png_bytep chunk_list
, int num_chunks
));
2497 extern PNG_EXPORT(void, png_set_unknown_chunks
) PNGARG((png_structp png_ptr
,
2498 png_infop info_ptr
, png_unknown_chunkp unknowns
, int num_unknowns
));
2499 extern PNG_EXPORT(void, png_set_unknown_chunk_location
)
2500 PNGARG((png_structp png_ptr
, png_infop info_ptr
, int chunk
, int location
));
2501 extern PNG_EXPORT(png_uint_32
,png_get_unknown_chunks
) PNGARG((png_structp
2502 png_ptr
, png_infop info_ptr
, png_unknown_chunkpp entries
));
2504 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2505 PNG_EXPORT(int,png_handle_as_unknown
) PNGARG((png_structp png_ptr
, png_bytep
2509 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2510 If you need to turn it off for a chunk that your application has freed,
2511 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2512 extern PNG_EXPORT(void, png_set_invalid
) PNGARG((png_structp png_ptr
,
2513 png_infop info_ptr
, int mask
));
2515 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2516 /* The "params" pointer is currently not used and is for future expansion. */
2517 extern PNG_EXPORT(void, png_read_png
) PNGARG((png_structp png_ptr
,
2521 extern PNG_EXPORT(void, png_write_png
) PNGARG((png_structp png_ptr
,
2527 /* Define PNG_DEBUG at compile time for debugging information. Higher
2528 * numbers for PNG_DEBUG mean more debugging information. This has
2529 * only been added since version 0.95 so it is not implemented throughout
2530 * libpng yet, but more support will be added as needed.
2534 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2541 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
2544 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
2547 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
2550 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2551 #ifndef PNG_DEBUG_FILE
2552 #define PNG_DEBUG_FILE stderr
2553 #endif /* PNG_DEBUG_FILE */
2556 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
2557 * non-ISO compilers */
2559 #define png_debug(l,m) \
2562 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2563 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2567 #define png_debug1(l,m,p1) \
2570 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2571 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2575 #define png_debug2(l,m,p1,p2) \
2578 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2579 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2582 #else /* __STDC __ */
2584 #define png_debug(l,m) \
2587 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2588 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2589 m,PNG_STRING_NEWLINE); \
2590 fprintf(PNG_DEBUG_FILE,format);
2593 #define png_debug1(l,m,p1) \
2596 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2597 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2598 m,PNG_STRING_NEWLINE); \
2599 fprintf(PNG_DEBUG_FILE,format,p1);
2602 #define png_debug2(l,m,p1,p2) \
2605 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2606 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2607 m,PNG_STRING_NEWLINE); \
2608 fprintf(PNG_DEBUG_FILE,format,p1,p2);
2610 #endif /* __STDC __ */
2611 #endif /* (PNG_DEBUG > 1) */
2612 #endif /* _MSC_VER */
2613 #endif /* (PNG_DEBUG > 0) */
2614 #endif /* PNG_DEBUG */
2616 #define png_debug(l, m)
2619 #define png_debug1(l, m, p1)
2622 #define png_debug2(l, m, p1, p2)
2625 extern PNG_EXPORT(png_charp
,png_get_copyright
) PNGARG((png_structp png_ptr
));
2626 extern PNG_EXPORT(png_charp
,png_get_header_ver
) PNGARG((png_structp png_ptr
));
2627 extern PNG_EXPORT(png_charp
,png_get_header_version
) PNGARG((png_structp png_ptr
));
2628 extern PNG_EXPORT(png_charp
,png_get_libpng_ver
) PNGARG((png_structp png_ptr
));
2630 #ifdef PNG_MNG_FEATURES_SUPPORTED
2631 extern PNG_EXPORT(png_uint_32
,png_permit_mng_features
) PNGARG((png_structp
2632 png_ptr
, png_uint_32 mng_features_permitted
));
2635 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2636 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2637 #define PNG_HANDLE_CHUNK_NEVER 1
2638 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2639 #define PNG_HANDLE_CHUNK_ALWAYS 3
2641 /* Added to version 1.2.0 */
2642 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2643 #if defined(PNG_MMX_CODE_SUPPORTED)
2644 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2645 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2646 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2647 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2648 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2649 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2650 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2651 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2652 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2654 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2655 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2656 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2657 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2658 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2659 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2660 #define PNG_MMX_WRITE_FLAGS ( 0 )
2662 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2663 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2664 | PNG_MMX_READ_FLAGS \
2665 | PNG_MMX_WRITE_FLAGS )
2667 #define PNG_SELECT_READ 1
2668 #define PNG_SELECT_WRITE 2
2669 #endif /* PNG_MMX_CODE_SUPPORTED */
2671 #if !defined(PNG_1_0_X)
2673 extern PNG_EXPORT(png_uint_32
,png_get_mmx_flagmask
)
2674 PNGARG((int flag_select
, int *compilerID
));
2677 extern PNG_EXPORT(png_uint_32
,png_get_asm_flagmask
)
2678 PNGARG((int flag_select
));
2681 extern PNG_EXPORT(png_uint_32
,png_get_asm_flags
)
2682 PNGARG((png_structp png_ptr
));
2685 extern PNG_EXPORT(png_byte
,png_get_mmx_bitdepth_threshold
)
2686 PNGARG((png_structp png_ptr
));
2689 extern PNG_EXPORT(png_uint_32
,png_get_mmx_rowbytes_threshold
)
2690 PNGARG((png_structp png_ptr
));
2693 extern PNG_EXPORT(void,png_set_asm_flags
)
2694 PNGARG((png_structp png_ptr
, png_uint_32 asm_flags
));
2697 extern PNG_EXPORT(void,png_set_mmx_thresholds
)
2698 PNGARG((png_structp png_ptr
, png_byte mmx_bitdepth_threshold
,
2699 png_uint_32 mmx_rowbytes_threshold
));
2701 #endif /* PNG_1_0_X */
2703 #if !defined(PNG_1_0_X)
2704 /* png.c, pnggccrd.c, or pngvcrd.c */
2705 extern PNG_EXPORT(int,png_mmx_support
) PNGARG((void));
2706 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2708 /* Strip the prepended error numbers ("#nnn ") from error and warning
2709 * messages before passing them to the error or warning handler. */
2710 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2711 extern PNG_EXPORT(void,png_set_strip_error_numbers
) PNGARG((png_structp
2712 png_ptr
, png_uint_32 strip_mode
));
2715 #endif /* PNG_1_0_X */
2717 /* Added at libpng-1.2.6 */
2718 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2719 extern PNG_EXPORT(void,png_set_user_limits
) PNGARG((png_structp
2720 png_ptr
, png_uint_32 user_width_max
, png_uint_32 user_height_max
));
2721 extern PNG_EXPORT(png_uint_32
,png_get_user_width_max
) PNGARG((png_structp
2723 extern PNG_EXPORT(png_uint_32
,png_get_user_height_max
) PNGARG((png_structp
2728 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2730 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2731 /* With these routines we avoid an integer divide, which will be slower on
2732 * most machines. However, it does take more operations than the corresponding
2733 * divide method, so it may be slower on a few RISC systems. There are two
2734 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2736 * Note that the rounding factors are NOT supposed to be the same! 128 and
2737 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2740 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2743 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2745 # define png_composite(composite, fg, alpha, bg) \
2746 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2747 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2748 (png_uint_16)(alpha)) + (png_uint_16)128); \
2749 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2751 # define png_composite_16(composite, fg, alpha, bg) \
2752 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2753 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2754 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2755 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2757 #else /* standard method using integer division */
2759 # define png_composite(composite, fg, alpha, bg) \
2760 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2761 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2762 (png_uint_16)127) / 255)
2764 # define png_composite_16(composite, fg, alpha, bg) \
2765 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2766 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2767 (png_uint_32)32767) / (png_uint_32)65535L)
2769 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2771 /* Inline macros to do direct reads of bytes from the input buffer. These
2772 * require that you are using an architecture that uses PNG byte ordering
2773 * (MSB first) and supports unaligned data storage. I think that PowerPC
2774 * in big-endian mode and 680x0 are the only ones that will support this.
2775 * The x86 line of processors definitely do not. The png_get_int_32()
2776 * routine also assumes we are using two's complement format for negative
2777 * values, which is almost certainly true.
2779 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2780 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2781 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2782 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2784 extern PNG_EXPORT(png_uint_32
,png_get_uint_32
) PNGARG((png_bytep buf
));
2785 extern PNG_EXPORT(png_uint_16
,png_get_uint_16
) PNGARG((png_bytep buf
));
2786 extern PNG_EXPORT(png_int_32
,png_get_int_32
) PNGARG((png_bytep buf
));
2787 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2788 extern PNG_EXPORT(png_uint_32
,png_get_uint_31
)
2789 PNGARG((png_structp png_ptr
, png_bytep buf
));
2790 /* No png_get_int_16 -- may be added if there's a real need for it. */
2792 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2794 extern PNG_EXPORT(void,png_save_uint_32
)
2795 PNGARG((png_bytep buf
, png_uint_32 i
));
2796 extern PNG_EXPORT(void,png_save_int_32
)
2797 PNGARG((png_bytep buf
, png_int_32 i
));
2799 /* Place a 16-bit number into a buffer in PNG byte order.
2800 * The parameter is declared unsigned int, not png_uint_16,
2801 * just to avoid potential problems on pre-ANSI C compilers.
2803 extern PNG_EXPORT(void,png_save_uint_16
)
2804 PNGARG((png_bytep buf
, unsigned int i
));
2805 /* No png_save_int_16 -- may be added if there's a real need for it. */
2807 /* ************************************************************************* */
2809 /* These next functions are used internally in the code. They generally
2810 * shouldn't be used unless you are writing code to add or replace some
2811 * functionality in libpng. More information about most functions can
2812 * be found in the files where the functions are located.
2816 /* Various modes of operation, that are visible to applications because
2817 * they are used for unknown chunk location.
2819 #define PNG_HAVE_IHDR 0x01
2820 #define PNG_HAVE_PLTE 0x02
2821 #define PNG_HAVE_IDAT 0x04
2822 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2823 #define PNG_HAVE_IEND 0x10
2825 #if defined(PNG_INTERNAL)
2827 /* More modes of operation. Note that after an init, mode is set to
2828 * zero automatically when the structure is created.
2830 #define PNG_HAVE_gAMA 0x20
2831 #define PNG_HAVE_cHRM 0x40
2832 #define PNG_HAVE_sRGB 0x80
2833 #define PNG_HAVE_CHUNK_HEADER 0x100
2834 #define PNG_WROTE_tIME 0x200
2835 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2836 #define PNG_BACKGROUND_IS_GRAY 0x800
2837 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2838 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2840 /* flags for the transformations the PNG library does on the image data */
2841 #define PNG_BGR 0x0001
2842 #define PNG_INTERLACE 0x0002
2843 #define PNG_PACK 0x0004
2844 #define PNG_SHIFT 0x0008
2845 #define PNG_SWAP_BYTES 0x0010
2846 #define PNG_INVERT_MONO 0x0020
2847 #define PNG_DITHER 0x0040
2848 #define PNG_BACKGROUND 0x0080
2849 #define PNG_BACKGROUND_EXPAND 0x0100
2851 #define PNG_16_TO_8 0x0400
2852 #define PNG_RGBA 0x0800
2853 #define PNG_EXPAND 0x1000
2854 #define PNG_GAMMA 0x2000
2855 #define PNG_GRAY_TO_RGB 0x4000
2856 #define PNG_FILLER 0x8000L
2857 #define PNG_PACKSWAP 0x10000L
2858 #define PNG_SWAP_ALPHA 0x20000L
2859 #define PNG_STRIP_ALPHA 0x40000L
2860 #define PNG_INVERT_ALPHA 0x80000L
2861 #define PNG_USER_TRANSFORM 0x100000L
2862 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2863 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2864 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2865 /* 0x800000L Unused */
2866 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2867 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2868 /* 0x4000000L unused */
2869 /* 0x8000000L unused */
2870 /* 0x10000000L unused */
2871 /* 0x20000000L unused */
2872 /* 0x40000000L unused */
2874 /* flags for png_create_struct */
2875 #define PNG_STRUCT_PNG 0x0001
2876 #define PNG_STRUCT_INFO 0x0002
2878 /* Scaling factor for filter heuristic weighting calculations */
2879 #define PNG_WEIGHT_SHIFT 8
2880 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2881 #define PNG_COST_SHIFT 3
2882 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2884 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2885 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2886 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2887 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2888 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2889 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2890 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2891 #define PNG_FLAG_ROW_INIT 0x0040
2892 #define PNG_FLAG_FILLER_AFTER 0x0080
2893 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2894 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2895 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2896 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2897 #define PNG_FLAG_FREE_PLTE 0x1000
2898 #define PNG_FLAG_FREE_TRNS 0x2000
2899 #define PNG_FLAG_FREE_HIST 0x4000
2900 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2901 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2902 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2903 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2904 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2905 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2906 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2907 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2908 /* 0x800000L unused */
2909 /* 0x1000000L unused */
2910 /* 0x2000000L unused */
2911 /* 0x4000000L unused */
2912 /* 0x8000000L unused */
2913 /* 0x10000000L unused */
2914 /* 0x20000000L unused */
2915 /* 0x40000000L unused */
2917 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2918 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2920 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2921 PNG_FLAG_CRC_CRITICAL_IGNORE)
2923 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2924 PNG_FLAG_CRC_CRITICAL_MASK)
2926 /* save typing and make code easier to understand */
2928 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2929 abs((int)((c1).green) - (int)((c2).green)) + \
2930 abs((int)((c1).blue) - (int)((c2).blue)))
2932 /* Added to libpng-1.2.6 JB */
2933 #define PNG_ROWBYTES(pixel_bits, width) \
2934 ((pixel_bits) >= 8 ? \
2935 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2936 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2938 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2939 ideal-delta..ideal+delta. Each argument is evaluated twice.
2940 "ideal" and "delta" should be constants, normally simple
2941 integers, "value" a variable. Added to libpng-1.2.6 JB */
2942 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2943 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2945 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2946 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2947 /* place to hold the signature string for a PNG file. */
2948 #ifdef PNG_USE_GLOBAL_ARRAYS
2949 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA
) png_sig
[8];
2952 #endif /* PNG_NO_EXTERN */
2954 /* Constant strings for known chunk types. If you need to add a chunk,
2955 * define the name here, and add an invocation of the macro in png.c and
2956 * wherever it's needed.
2958 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2959 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2960 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2961 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2962 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2963 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2964 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2965 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2966 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2967 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2968 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2969 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2970 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2971 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2972 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2973 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2974 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2975 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2976 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2977 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2978 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2980 #ifdef PNG_USE_GLOBAL_ARRAYS
2981 PNG_EXPORT_VAR (png_byte FARDATA
) png_IHDR
[5];
2982 PNG_EXPORT_VAR (png_byte FARDATA
) png_IDAT
[5];
2983 PNG_EXPORT_VAR (png_byte FARDATA
) png_IEND
[5];
2984 PNG_EXPORT_VAR (png_byte FARDATA
) png_PLTE
[5];
2985 PNG_EXPORT_VAR (png_byte FARDATA
) png_bKGD
[5];
2986 PNG_EXPORT_VAR (png_byte FARDATA
) png_cHRM
[5];
2987 PNG_EXPORT_VAR (png_byte FARDATA
) png_gAMA
[5];
2988 PNG_EXPORT_VAR (png_byte FARDATA
) png_hIST
[5];
2989 PNG_EXPORT_VAR (png_byte FARDATA
) png_iCCP
[5];
2990 PNG_EXPORT_VAR (png_byte FARDATA
) png_iTXt
[5];
2991 PNG_EXPORT_VAR (png_byte FARDATA
) png_oFFs
[5];
2992 PNG_EXPORT_VAR (png_byte FARDATA
) png_pCAL
[5];
2993 PNG_EXPORT_VAR (png_byte FARDATA
) png_sCAL
[5];
2994 PNG_EXPORT_VAR (png_byte FARDATA
) png_pHYs
[5];
2995 PNG_EXPORT_VAR (png_byte FARDATA
) png_sBIT
[5];
2996 PNG_EXPORT_VAR (png_byte FARDATA
) png_sPLT
[5];
2997 PNG_EXPORT_VAR (png_byte FARDATA
) png_sRGB
[5];
2998 PNG_EXPORT_VAR (png_byte FARDATA
) png_tEXt
[5];
2999 PNG_EXPORT_VAR (png_byte FARDATA
) png_tIME
[5];
3000 PNG_EXPORT_VAR (png_byte FARDATA
) png_tRNS
[5];
3001 PNG_EXPORT_VAR (png_byte FARDATA
) png_zTXt
[5];
3002 #endif /* PNG_USE_GLOBAL_ARRAYS */
3004 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3005 /* Initialize png_ptr struct for reading, and allocate any other memory.
3006 * (old interface - DEPRECATED - use png_create_read_struct instead).
3008 extern PNG_EXPORT(void,png_read_init
) PNGARG((png_structp png_ptr
));
3009 #undef png_read_init
3010 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
3011 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3014 extern PNG_EXPORT(void,png_read_init_3
) PNGARG((png_structpp ptr_ptr
,
3015 png_const_charp user_png_ver
, png_size_t png_struct_size
));
3016 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3017 extern PNG_EXPORT(void,png_read_init_2
) PNGARG((png_structp png_ptr
,
3018 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
3022 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3023 /* Initialize png_ptr struct for writing, and allocate any other memory.
3024 * (old interface - DEPRECATED - use png_create_write_struct instead).
3026 extern PNG_EXPORT(void,png_write_init
) PNGARG((png_structp png_ptr
));
3027 #undef png_write_init
3028 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
3029 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3032 extern PNG_EXPORT(void,png_write_init_3
) PNGARG((png_structpp ptr_ptr
,
3033 png_const_charp user_png_ver
, png_size_t png_struct_size
));
3034 extern PNG_EXPORT(void,png_write_init_2
) PNGARG((png_structp png_ptr
,
3035 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
3038 /* Allocate memory for an internal libpng struct */
3039 PNG_EXTERN png_voidp png_create_struct
PNGARG((int type
));
3041 /* Free memory from internal libpng struct */
3042 PNG_EXTERN
void png_destroy_struct
PNGARG((png_voidp struct_ptr
));
3044 PNG_EXTERN png_voidp png_create_struct_2
PNGARG((int type
, png_malloc_ptr
3045 malloc_fn
, png_voidp mem_ptr
));
3046 PNG_EXTERN
void png_destroy_struct_2
PNGARG((png_voidp struct_ptr
,
3047 png_free_ptr free_fn
, png_voidp mem_ptr
));
3049 /* Free any memory that info_ptr points to and reset struct. */
3050 PNG_EXTERN
void png_info_destroy
PNGARG((png_structp png_ptr
,
3051 png_infop info_ptr
));
3054 /* Function to allocate memory for zlib. */
3055 PNG_EXTERN voidpf png_zalloc
PNGARG((voidpf png_ptr
, uInt items
, uInt size
));
3057 /* Function to free memory for zlib */
3058 PNG_EXTERN
void png_zfree
PNGARG((voidpf png_ptr
, voidpf ptr
));
3061 /* Function to convert a sizeof an item to png_sizeof item */
3062 PNG_EXTERN png_size_t PNGAPI png_convert_size
PNGARG((size_t size
));
3065 /* Next four functions are used internally as callbacks. PNGAPI is required
3066 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
3068 PNG_EXTERN
void PNGAPI png_default_read_data
PNGARG((png_structp png_ptr
,
3069 png_bytep data
, png_size_t length
));
3071 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3072 PNG_EXTERN
void PNGAPI png_push_fill_buffer
PNGARG((png_structp png_ptr
,
3073 png_bytep buffer
, png_size_t length
));
3076 PNG_EXTERN
void PNGAPI png_default_write_data
PNGARG((png_structp png_ptr
,
3077 png_bytep data
, png_size_t length
));
3079 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3080 #if !defined(PNG_NO_STDIO)
3081 PNG_EXTERN
void PNGAPI png_default_flush
PNGARG((png_structp png_ptr
));
3084 #else /* PNG_1_0_X */
3085 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3086 PNG_EXTERN
void png_push_fill_buffer
PNGARG((png_structp png_ptr
,
3087 png_bytep buffer
, png_size_t length
));
3089 #endif /* PNG_1_0_X */
3091 /* Reset the CRC variable */
3092 PNG_EXTERN
void png_reset_crc
PNGARG((png_structp png_ptr
));
3094 /* Write the "data" buffer to whatever output you are using. */
3095 PNG_EXTERN
void png_write_data
PNGARG((png_structp png_ptr
, png_bytep data
,
3096 png_size_t length
));
3098 /* Read data from whatever input you are using into the "data" buffer */
3099 PNG_EXTERN
void png_read_data
PNGARG((png_structp png_ptr
, png_bytep data
,
3100 png_size_t length
));
3102 /* Read bytes into buf, and update png_ptr->crc */
3103 PNG_EXTERN
void png_crc_read
PNGARG((png_structp png_ptr
, png_bytep buf
,
3104 png_size_t length
));
3106 /* Decompress data in a chunk that uses compression */
3107 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3108 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3109 PNG_EXTERN
void png_decompress_chunk
PNGARG((png_structp png_ptr
,
3110 int comp_type
, png_size_t chunklength
,
3111 png_size_t prefix_length
, png_size_t
*data_length
));
3114 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3115 PNG_EXTERN
int png_crc_finish
PNGARG((png_structp png_ptr
, png_uint_32 skip
));
3117 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3118 PNG_EXTERN
int png_crc_error
PNGARG((png_structp png_ptr
));
3120 /* Calculate the CRC over a section of data. Note that we are only
3121 * passing a maximum of 64K on systems that have this as a memory limit,
3122 * since this is the maximum buffer size we can specify.
3124 PNG_EXTERN
void png_calculate_crc
PNGARG((png_structp png_ptr
, png_bytep ptr
,
3125 png_size_t length
));
3127 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3128 PNG_EXTERN
void png_flush
PNGARG((png_structp png_ptr
));
3131 /* simple function to write the signature */
3132 PNG_EXTERN
void png_write_sig
PNGARG((png_structp png_ptr
));
3134 /* write various chunks */
3136 /* Write the IHDR chunk, and update the png_struct with the necessary
3139 PNG_EXTERN
void png_write_IHDR
PNGARG((png_structp png_ptr
, png_uint_32 width
,
3141 int bit_depth
, int color_type
, int compression_method
, int filter_method
,
3142 int interlace_method
));
3144 PNG_EXTERN
void png_write_PLTE
PNGARG((png_structp png_ptr
, png_colorp palette
,
3145 png_uint_32 num_pal
));
3147 PNG_EXTERN
void png_write_IDAT
PNGARG((png_structp png_ptr
, png_bytep data
,
3148 png_size_t length
));
3150 PNG_EXTERN
void png_write_IEND
PNGARG((png_structp png_ptr
));
3152 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3153 #ifdef PNG_FLOATING_POINT_SUPPORTED
3154 PNG_EXTERN
void png_write_gAMA
PNGARG((png_structp png_ptr
, double file_gamma
));
3156 #ifdef PNG_FIXED_POINT_SUPPORTED
3157 PNG_EXTERN
void png_write_gAMA_fixed
PNGARG((png_structp png_ptr
, png_fixed_point
3162 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3163 PNG_EXTERN
void png_write_sBIT
PNGARG((png_structp png_ptr
, png_color_8p sbit
,
3167 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3168 #ifdef PNG_FLOATING_POINT_SUPPORTED
3169 PNG_EXTERN
void png_write_cHRM
PNGARG((png_structp png_ptr
,
3170 double white_x
, double white_y
,
3171 double red_x
, double red_y
, double green_x
, double green_y
,
3172 double blue_x
, double blue_y
));
3174 #ifdef PNG_FIXED_POINT_SUPPORTED
3175 PNG_EXTERN
void png_write_cHRM_fixed
PNGARG((png_structp png_ptr
,
3176 png_fixed_point int_white_x
, png_fixed_point int_white_y
,
3177 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
3178 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
3179 png_fixed_point int_blue_y
));
3183 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3184 PNG_EXTERN
void png_write_sRGB
PNGARG((png_structp png_ptr
,
3188 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3189 PNG_EXTERN
void png_write_iCCP
PNGARG((png_structp png_ptr
,
3190 png_charp name
, int compression_type
,
3191 png_charp profile
, int proflen
));
3192 /* Note to maintainer: profile should be png_bytep */
3195 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3196 PNG_EXTERN
void png_write_sPLT
PNGARG((png_structp png_ptr
,
3197 png_sPLT_tp palette
));
3200 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3201 PNG_EXTERN
void png_write_tRNS
PNGARG((png_structp png_ptr
, png_bytep trans
,
3202 png_color_16p values
, int number
, int color_type
));
3205 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3206 PNG_EXTERN
void png_write_bKGD
PNGARG((png_structp png_ptr
,
3207 png_color_16p values
, int color_type
));
3210 #if defined(PNG_WRITE_hIST_SUPPORTED)
3211 PNG_EXTERN
void png_write_hIST
PNGARG((png_structp png_ptr
, png_uint_16p hist
,
3215 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3216 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3217 PNG_EXTERN png_size_t png_check_keyword
PNGARG((png_structp png_ptr
,
3218 png_charp key
, png_charpp new_key
));
3221 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3222 PNG_EXTERN
void png_write_tEXt
PNGARG((png_structp png_ptr
, png_charp key
,
3223 png_charp text
, png_size_t text_len
));
3226 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3227 PNG_EXTERN
void png_write_zTXt
PNGARG((png_structp png_ptr
, png_charp key
,
3228 png_charp text
, png_size_t text_len
, int compression
));
3231 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3232 PNG_EXTERN
void png_write_iTXt
PNGARG((png_structp png_ptr
,
3233 int compression
, png_charp key
, png_charp lang
, png_charp lang_key
,
3237 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3238 PNG_EXTERN
int png_set_text_2
PNGARG((png_structp png_ptr
,
3239 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
3242 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3243 PNG_EXTERN
void png_write_oFFs
PNGARG((png_structp png_ptr
,
3244 png_int_32 x_offset
, png_int_32 y_offset
, int unit_type
));
3247 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3248 PNG_EXTERN
void png_write_pCAL
PNGARG((png_structp png_ptr
, png_charp purpose
,
3249 png_int_32 X0
, png_int_32 X1
, int type
, int nparams
,
3250 png_charp units
, png_charpp params
));
3253 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3254 PNG_EXTERN
void png_write_pHYs
PNGARG((png_structp png_ptr
,
3255 png_uint_32 x_pixels_per_unit
, png_uint_32 y_pixels_per_unit
,
3259 #if defined(PNG_WRITE_tIME_SUPPORTED)
3260 PNG_EXTERN
void png_write_tIME
PNGARG((png_structp png_ptr
,
3261 png_timep mod_time
));
3264 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3265 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3266 PNG_EXTERN
void png_write_sCAL
PNGARG((png_structp png_ptr
,
3267 int unit
, double width
, double height
));
3269 #ifdef PNG_FIXED_POINT_SUPPORTED
3270 PNG_EXTERN
void png_write_sCAL_s
PNGARG((png_structp png_ptr
,
3271 int unit
, png_charp width
, png_charp height
));
3276 /* Called when finished processing a row of data */
3277 PNG_EXTERN
void png_write_finish_row
PNGARG((png_structp png_ptr
));
3279 /* Internal use only. Called before first row of data */
3280 PNG_EXTERN
void png_write_start_row
PNGARG((png_structp png_ptr
));
3282 #if defined(PNG_READ_GAMMA_SUPPORTED)
3283 PNG_EXTERN
void png_build_gamma_table
PNGARG((png_structp png_ptr
));
3286 /* combine a row of data, dealing with alpha, etc. if requested */
3287 PNG_EXTERN
void png_combine_row
PNGARG((png_structp png_ptr
, png_bytep row
,
3290 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3291 /* expand an interlaced row */
3292 /* OLD pre-1.0.9 interface:
3293 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3294 png_bytep row, int pass, png_uint_32 transformations));
3296 PNG_EXTERN
void png_do_read_interlace
PNGARG((png_structp png_ptr
));
3299 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3301 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3302 /* grab pixels out of a row for an interlaced pass */
3303 PNG_EXTERN
void png_do_write_interlace
PNGARG((png_row_infop row_info
,
3304 png_bytep row
, int pass
));
3307 /* unfilter a row */
3308 PNG_EXTERN
void png_read_filter_row
PNGARG((png_structp png_ptr
,
3309 png_row_infop row_info
, png_bytep row
, png_bytep prev_row
, int filter
));
3311 /* Choose the best filter to use and filter the row data */
3312 PNG_EXTERN
void png_write_find_filter
PNGARG((png_structp png_ptr
,
3313 png_row_infop row_info
));
3315 /* Write out the filtered row. */
3316 PNG_EXTERN
void png_write_filtered_row
PNGARG((png_structp png_ptr
,
3317 png_bytep filtered_row
));
3318 /* finish a row while reading, dealing with interlacing passes, etc. */
3319 PNG_EXTERN
void png_read_finish_row
PNGARG((png_structp png_ptr
));
3321 /* initialize the row buffers, etc. */
3322 PNG_EXTERN
void png_read_start_row
PNGARG((png_structp png_ptr
));
3323 /* optional call to update the users info structure */
3324 PNG_EXTERN
void png_read_transform_info
PNGARG((png_structp png_ptr
,
3325 png_infop info_ptr
));
3327 /* these are the functions that do the transformations */
3328 #if defined(PNG_READ_FILLER_SUPPORTED)
3329 PNG_EXTERN
void png_do_read_filler
PNGARG((png_row_infop row_info
,
3330 png_bytep row
, png_uint_32 filler
, png_uint_32 flags
));
3333 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3334 PNG_EXTERN
void png_do_read_swap_alpha
PNGARG((png_row_infop row_info
,
3338 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3339 PNG_EXTERN
void png_do_write_swap_alpha
PNGARG((png_row_infop row_info
,
3343 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3344 PNG_EXTERN
void png_do_read_invert_alpha
PNGARG((png_row_infop row_info
,
3348 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3349 PNG_EXTERN
void png_do_write_invert_alpha
PNGARG((png_row_infop row_info
,
3353 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3354 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3355 PNG_EXTERN
void png_do_strip_filler
PNGARG((png_row_infop row_info
,
3356 png_bytep row
, png_uint_32 flags
));
3359 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3360 PNG_EXTERN
void png_do_swap
PNGARG((png_row_infop row_info
, png_bytep row
));
3363 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3364 PNG_EXTERN
void png_do_packswap
PNGARG((png_row_infop row_info
, png_bytep row
));
3367 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3368 PNG_EXTERN
int png_do_rgb_to_gray
PNGARG((png_structp png_ptr
, png_row_infop
3369 row_info
, png_bytep row
));
3372 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3373 PNG_EXTERN
void png_do_gray_to_rgb
PNGARG((png_row_infop row_info
,
3377 #if defined(PNG_READ_PACK_SUPPORTED)
3378 PNG_EXTERN
void png_do_unpack
PNGARG((png_row_infop row_info
, png_bytep row
));
3381 #if defined(PNG_READ_SHIFT_SUPPORTED)
3382 PNG_EXTERN
void png_do_unshift
PNGARG((png_row_infop row_info
, png_bytep row
,
3383 png_color_8p sig_bits
));
3386 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3387 PNG_EXTERN
void png_do_invert
PNGARG((png_row_infop row_info
, png_bytep row
));
3390 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3391 PNG_EXTERN
void png_do_chop
PNGARG((png_row_infop row_info
, png_bytep row
));
3394 #if defined(PNG_READ_DITHER_SUPPORTED)
3395 PNG_EXTERN
void png_do_dither
PNGARG((png_row_infop row_info
,
3396 png_bytep row
, png_bytep palette_lookup
, png_bytep dither_lookup
));
3398 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3399 PNG_EXTERN
void png_correct_palette
PNGARG((png_structp png_ptr
,
3400 png_colorp palette
, int num_palette
));
3404 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3405 PNG_EXTERN
void png_do_bgr
PNGARG((png_row_infop row_info
, png_bytep row
));
3408 #if defined(PNG_WRITE_PACK_SUPPORTED)
3409 PNG_EXTERN
void png_do_pack
PNGARG((png_row_infop row_info
,
3410 png_bytep row
, png_uint_32 bit_depth
));
3413 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3414 PNG_EXTERN
void png_do_shift
PNGARG((png_row_infop row_info
, png_bytep row
,
3415 png_color_8p bit_depth
));
3418 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3419 #if defined(PNG_READ_GAMMA_SUPPORTED)
3420 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3421 png_color_16p trans_values
, png_color_16p background
,
3422 png_color_16p background_1
,
3423 png_bytep gamma_table
, png_bytep gamma_from_1
, png_bytep gamma_to_1
,
3424 png_uint_16pp gamma_16
, png_uint_16pp gamma_16_from_1
,
3425 png_uint_16pp gamma_16_to_1
, int gamma_shift
));
3427 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3428 png_color_16p trans_values
, png_color_16p background
));
3432 #if defined(PNG_READ_GAMMA_SUPPORTED)
3433 PNG_EXTERN
void png_do_gamma
PNGARG((png_row_infop row_info
, png_bytep row
,
3434 png_bytep gamma_table
, png_uint_16pp gamma_16_table
,
3438 #if defined(PNG_READ_EXPAND_SUPPORTED)
3439 PNG_EXTERN
void png_do_expand_palette
PNGARG((png_row_infop row_info
,
3440 png_bytep row
, png_colorp palette
, png_bytep trans
, int num_trans
));
3441 PNG_EXTERN
void png_do_expand
PNGARG((png_row_infop row_info
,
3442 png_bytep row
, png_color_16p trans_value
));
3445 /* The following decodes the appropriate chunks, and does error correction,
3446 * then calls the appropriate callback for the chunk if it is valid.
3449 /* decode the IHDR chunk */
3450 PNG_EXTERN
void png_handle_IHDR
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3451 png_uint_32 length
));
3452 PNG_EXTERN
void png_handle_PLTE
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3453 png_uint_32 length
));
3454 PNG_EXTERN
void png_handle_IEND
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3455 png_uint_32 length
));
3457 #if defined(PNG_READ_bKGD_SUPPORTED)
3458 PNG_EXTERN
void png_handle_bKGD
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3459 png_uint_32 length
));
3462 #if defined(PNG_READ_cHRM_SUPPORTED)
3463 PNG_EXTERN
void png_handle_cHRM
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3464 png_uint_32 length
));
3467 #if defined(PNG_READ_gAMA_SUPPORTED)
3468 PNG_EXTERN
void png_handle_gAMA
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3469 png_uint_32 length
));
3472 #if defined(PNG_READ_hIST_SUPPORTED)
3473 PNG_EXTERN
void png_handle_hIST
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3474 png_uint_32 length
));
3477 #if defined(PNG_READ_iCCP_SUPPORTED)
3478 extern void png_handle_iCCP
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3479 png_uint_32 length
));
3480 #endif /* PNG_READ_iCCP_SUPPORTED */
3482 #if defined(PNG_READ_iTXt_SUPPORTED)
3483 PNG_EXTERN
void png_handle_iTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3484 png_uint_32 length
));
3487 #if defined(PNG_READ_oFFs_SUPPORTED)
3488 PNG_EXTERN
void png_handle_oFFs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3489 png_uint_32 length
));
3492 #if defined(PNG_READ_pCAL_SUPPORTED)
3493 PNG_EXTERN
void png_handle_pCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3494 png_uint_32 length
));
3497 #if defined(PNG_READ_pHYs_SUPPORTED)
3498 PNG_EXTERN
void png_handle_pHYs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3499 png_uint_32 length
));
3502 #if defined(PNG_READ_sBIT_SUPPORTED)
3503 PNG_EXTERN
void png_handle_sBIT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3504 png_uint_32 length
));
3507 #if defined(PNG_READ_sCAL_SUPPORTED)
3508 PNG_EXTERN
void png_handle_sCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3509 png_uint_32 length
));
3512 #if defined(PNG_READ_sPLT_SUPPORTED)
3513 extern void png_handle_sPLT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3514 png_uint_32 length
));
3515 #endif /* PNG_READ_sPLT_SUPPORTED */
3517 #if defined(PNG_READ_sRGB_SUPPORTED)
3518 PNG_EXTERN
void png_handle_sRGB
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3519 png_uint_32 length
));
3522 #if defined(PNG_READ_tEXt_SUPPORTED)
3523 PNG_EXTERN
void png_handle_tEXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3524 png_uint_32 length
));
3527 #if defined(PNG_READ_tIME_SUPPORTED)
3528 PNG_EXTERN
void png_handle_tIME
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3529 png_uint_32 length
));
3532 #if defined(PNG_READ_tRNS_SUPPORTED)
3533 PNG_EXTERN
void png_handle_tRNS
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3534 png_uint_32 length
));
3537 #if defined(PNG_READ_zTXt_SUPPORTED)
3538 PNG_EXTERN
void png_handle_zTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3539 png_uint_32 length
));
3542 PNG_EXTERN
void png_handle_unknown
PNGARG((png_structp png_ptr
,
3543 png_infop info_ptr
, png_uint_32 length
));
3545 PNG_EXTERN
void png_check_chunk_name
PNGARG((png_structp png_ptr
,
3546 png_bytep chunk_name
));
3548 /* handle the transformations for reading and writing */
3549 PNG_EXTERN
void png_do_read_transformations
PNGARG((png_structp png_ptr
));
3550 PNG_EXTERN
void png_do_write_transformations
PNGARG((png_structp png_ptr
));
3552 PNG_EXTERN
void png_init_read_transformations
PNGARG((png_structp png_ptr
));
3554 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3555 PNG_EXTERN
void png_push_read_chunk
PNGARG((png_structp png_ptr
,
3556 png_infop info_ptr
));
3557 PNG_EXTERN
void png_push_read_sig
PNGARG((png_structp png_ptr
,
3558 png_infop info_ptr
));
3559 PNG_EXTERN
void png_push_check_crc
PNGARG((png_structp png_ptr
));
3560 PNG_EXTERN
void png_push_crc_skip
PNGARG((png_structp png_ptr
,
3561 png_uint_32 length
));
3562 PNG_EXTERN
void png_push_crc_finish
PNGARG((png_structp png_ptr
));
3563 PNG_EXTERN
void png_push_save_buffer
PNGARG((png_structp png_ptr
));
3564 PNG_EXTERN
void png_push_restore_buffer
PNGARG((png_structp png_ptr
,
3565 png_bytep buffer
, png_size_t buffer_length
));
3566 PNG_EXTERN
void png_push_read_IDAT
PNGARG((png_structp png_ptr
));
3567 PNG_EXTERN
void png_process_IDAT_data
PNGARG((png_structp png_ptr
,
3568 png_bytep buffer
, png_size_t buffer_length
));
3569 PNG_EXTERN
void png_push_process_row
PNGARG((png_structp png_ptr
));
3570 PNG_EXTERN
void png_push_handle_unknown
PNGARG((png_structp png_ptr
,
3571 png_infop info_ptr
, png_uint_32 length
));
3572 PNG_EXTERN
void png_push_have_info
PNGARG((png_structp png_ptr
,
3573 png_infop info_ptr
));
3574 PNG_EXTERN
void png_push_have_end
PNGARG((png_structp png_ptr
,
3575 png_infop info_ptr
));
3576 PNG_EXTERN
void png_push_have_row
PNGARG((png_structp png_ptr
, png_bytep row
));
3577 PNG_EXTERN
void png_push_read_end
PNGARG((png_structp png_ptr
,
3578 png_infop info_ptr
));
3579 PNG_EXTERN
void png_process_some_data
PNGARG((png_structp png_ptr
,
3580 png_infop info_ptr
));
3581 PNG_EXTERN
void png_read_push_finish_row
PNGARG((png_structp png_ptr
));
3582 #if defined(PNG_READ_tEXt_SUPPORTED)
3583 PNG_EXTERN
void png_push_handle_tEXt
PNGARG((png_structp png_ptr
,
3584 png_infop info_ptr
, png_uint_32 length
));
3585 PNG_EXTERN
void png_push_read_tEXt
PNGARG((png_structp png_ptr
,
3586 png_infop info_ptr
));
3588 #if defined(PNG_READ_zTXt_SUPPORTED)
3589 PNG_EXTERN
void png_push_handle_zTXt
PNGARG((png_structp png_ptr
,
3590 png_infop info_ptr
, png_uint_32 length
));
3591 PNG_EXTERN
void png_push_read_zTXt
PNGARG((png_structp png_ptr
,
3592 png_infop info_ptr
));
3594 #if defined(PNG_READ_iTXt_SUPPORTED)
3595 PNG_EXTERN
void png_push_handle_iTXt
PNGARG((png_structp png_ptr
,
3596 png_infop info_ptr
, png_uint_32 length
));
3597 PNG_EXTERN
void png_push_read_iTXt
PNGARG((png_structp png_ptr
,
3598 png_infop info_ptr
));
3601 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3603 #ifdef PNG_MNG_FEATURES_SUPPORTED
3604 PNG_EXTERN
void png_do_read_intrapixel
PNGARG((png_row_infop row_info
,
3606 PNG_EXTERN
void png_do_write_intrapixel
PNGARG((png_row_infop row_info
,
3610 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3611 #if defined(PNG_MMX_CODE_SUPPORTED)
3612 /* png.c */ /* PRIVATE */
3613 PNG_EXTERN
void png_init_mmx_flags
PNGARG((png_structp png_ptr
));
3617 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3618 PNG_EXTERN png_uint_32 png_get_pixels_per_inch
PNGARG((png_structp png_ptr
,
3619 png_infop info_ptr
));
3621 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch
PNGARG((png_structp png_ptr
,
3622 png_infop info_ptr
));
3624 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch
PNGARG((png_structp png_ptr
,
3625 png_infop info_ptr
));
3627 PNG_EXTERN
float png_get_x_offset_inches
PNGARG((png_structp png_ptr
,
3628 png_infop info_ptr
));
3630 PNG_EXTERN
float png_get_y_offset_inches
PNGARG((png_structp png_ptr
,
3631 png_infop info_ptr
));
3633 #if defined(PNG_pHYs_SUPPORTED)
3634 PNG_EXTERN png_uint_32 png_get_pHYs_dpi
PNGARG((png_structp png_ptr
,
3635 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
3636 #endif /* PNG_pHYs_SUPPORTED */
3637 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3639 /* Read the chunk header (length + type name) */
3640 PNG_EXTERN png_uint_32 png_read_chunk_header
PNGARG((png_structp png_ptr
));
3642 /* Added at libpng version 1.2.34 */
3643 #if defined(PNG_cHRM_SUPPORTED)
3644 PNG_EXTERN
int png_check_cHRM_fixed
PNGARG((png_structp png_ptr
,
3645 png_fixed_point int_white_x
, png_fixed_point int_white_y
,
3646 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
3647 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
3648 png_fixed_point int_blue_y
));
3651 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3653 #endif /* PNG_INTERNAL */
3659 #endif /* PNG_VERSION_INFO_ONLY */
3660 /* do not put anything past this line */
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