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