1 /* png.h - header file for PNG reference library
3 * libpng version 1.2.29 - May 8, 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 1.2.29 - May 8, 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]
196 * Henceforth the source version will match the shared-library major
197 * and minor numbers; the shared-library major version number will be
198 * used for changes in backward compatibility, as it is intended. The
199 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
200 * for applications, is an unsigned integer of the form xyyzz corresponding
201 * to the source version x.y.z (leading zeros in y and z). Beta versions
202 * were given the previous public release number plus a letter, until
203 * version 1.0.6j; from then on they were given the upcoming public
204 * release number plus "betaNN" or "rcNN".
206 * Binary incompatibility exists only when applications make direct access
207 * to the info_ptr or png_ptr members through png.h, and the compiled
208 * application is loaded with a different version of the library.
210 * DLLNUM will change each time there are forward or backward changes
211 * in binary compatibility (e.g., when a new feature is added).
213 * See libpng.txt or libpng.3 for more information. The PNG specification
214 * is available as a W3C Recommendation and as an ISO Specification,
215 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
219 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
221 * If you modify libpng you may insert additional notices immediately following
224 * libpng versions 1.2.6, August 15, 2004, through 1.2.29, May 8, 2008, are
225 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
226 * distributed according to the same disclaimer and license as libpng-1.2.5
227 * with the following individual added to the list of Contributing Authors:
231 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
232 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
233 * distributed according to the same disclaimer and license as libpng-1.0.6
234 * with the following individuals added to the list of Contributing Authors:
236 * Simon-Pierre Cadieux
240 * and with the following additions to the disclaimer:
242 * There is no warranty against interference with your enjoyment of the
243 * library or against infringement. There is no warranty that our
244 * efforts or the library will fulfill any of your particular purposes
245 * or needs. This library is provided with all faults, and the entire
246 * risk of satisfactory quality, performance, accuracy, and effort is with
249 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
250 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
251 * distributed according to the same disclaimer and license as libpng-0.96,
252 * with the following individuals added to the list of Contributing Authors:
255 * Glenn Randers-Pehrson
258 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
259 * Copyright (c) 1996, 1997 Andreas Dilger
260 * Distributed according to the same disclaimer and license as libpng-0.88,
261 * with the following individuals added to the list of Contributing Authors:
270 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
271 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
273 * For the purposes of this copyright and license, "Contributing Authors"
274 * is defined as the following set of individuals:
282 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
283 * and Group 42, Inc. disclaim all warranties, expressed or implied,
284 * including, without limitation, the warranties of merchantability and of
285 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
286 * assume no liability for direct, indirect, incidental, special, exemplary,
287 * or consequential damages, which may result from the use of the PNG
288 * Reference Library, even if advised of the possibility of such damage.
290 * Permission is hereby granted to use, copy, modify, and distribute this
291 * source code, or portions hereof, for any purpose, without fee, subject
292 * to the following restrictions:
294 * 1. The origin of this source code must not be misrepresented.
296 * 2. Altered versions must be plainly marked as such and
297 * must not be misrepresented as being the original source.
299 * 3. This Copyright notice may not be removed or altered from
300 * any source or altered source distribution.
302 * The Contributing Authors and Group 42, Inc. specifically permit, without
303 * fee, and encourage the use of this source code as a component to
304 * supporting the PNG file format in commercial products. If you use this
305 * source code in a product, acknowledgment is not required but would be
310 * A "png_get_copyright" function is available, for convenient use in "about"
311 * boxes and the like:
313 * printf("%s",png_get_copyright(NULL));
315 * Also, the PNG logo (in PNG format, of course) is supplied in the
316 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
320 * Libpng is OSI Certified Open Source Software. OSI Certified is a
321 * certification mark of the Open Source Initiative.
325 * The contributing authors would like to thank all those who helped
326 * with testing, bug fixes, and patience. This wouldn't have been
327 * possible without all of you.
329 * Thanks to Frank J. T. Wojcik for helping with the documentation.
333 * Y2K compliance in libpng:
334 * =========================
338 * Since the PNG Development group is an ad-hoc body, we can't make
339 * an official declaration.
341 * This is your unofficial assurance that libpng from version 0.71 and
342 * upward through 1.2.29 are Y2K compliant. It is my belief that earlier
343 * versions were also Y2K compliant.
345 * Libpng only has three year fields. One is a 2-byte unsigned integer
346 * that will hold years up to 65535. The other two hold the date in text
347 * format, and will hold years up to 9999.
350 * "png_uint_16 year" in png_time_struct.
353 * "png_charp time_buffer" in png_struct and
354 * "near_time_buffer", which is a local character string in png.c.
356 * There are seven time-related functions:
357 * png.c: png_convert_to_rfc_1123() in png.c
358 * (formerly png_convert_to_rfc_1152() in error)
359 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
360 * png_convert_from_time_t() in pngwrite.c
361 * png_get_tIME() in pngget.c
362 * png_handle_tIME() in pngrutil.c, called in pngread.c
363 * png_set_tIME() in pngset.c
364 * png_write_tIME() in pngwutil.c, called in pngwrite.c
366 * All handle dates properly in a Y2K environment. The
367 * png_convert_from_time_t() function calls gmtime() to convert from system
368 * clock time, which returns (year - 1900), which we properly convert to
369 * the full 4-digit year. There is a possibility that applications using
370 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
371 * function, or that they are incorrectly passing only a 2-digit year
372 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
373 * but this is not under our control. The libpng documentation has always
374 * stated that it works with 4-digit years, and the APIs have been
375 * documented as such.
377 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
378 * integer to hold the year, and can hold years as large as 65535.
380 * zlib, upon which libpng depends, is also Y2K compliant. It contains
381 * no date-related code.
383 * Glenn Randers-Pehrson
385 * PNG Development Group
391 /* This is not the place to learn how to use libpng. The file libpng.txt
392 * describes how to use libpng, and the file example.c summarizes it
393 * with some code on which to build. This file is useful for looking
394 * at the actual function definitions and structure components.
397 /* Version information for png.h - this should match the version in png.c */
398 #define PNG_LIBPNG_VER_STRING "1.2.29"
399 #define PNG_HEADER_VERSION_STRING \
400 " libpng version 1.2.29 - May 8, 2008\n"
402 #define PNG_LIBPNG_VER_SONUM 0
403 #define PNG_LIBPNG_VER_DLLNUM 13
405 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
406 #define PNG_LIBPNG_VER_MAJOR 1
407 #define PNG_LIBPNG_VER_MINOR 2
408 #define PNG_LIBPNG_VER_RELEASE 29
409 /* This should match the numeric part of the final component of
410 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
412 #define PNG_LIBPNG_VER_BUILD 0
415 #define PNG_LIBPNG_BUILD_ALPHA 1
416 #define PNG_LIBPNG_BUILD_BETA 2
417 #define PNG_LIBPNG_BUILD_RC 3
418 #define PNG_LIBPNG_BUILD_STABLE 4
419 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
421 /* Release-Specific Flags */
422 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
423 PNG_LIBPNG_BUILD_STABLE only */
424 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
425 PNG_LIBPNG_BUILD_SPECIAL */
426 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
427 PNG_LIBPNG_BUILD_PRIVATE */
429 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
431 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
432 * We must not include leading zeros.
433 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
434 * version 1.0.0 was mis-numbered 100 instead of 10000). From
435 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
436 #define PNG_LIBPNG_VER 10229 /* 1.2.29 */
438 #ifndef PNG_VERSION_INFO_ONLY
439 /* include the compression library's header */
443 /* include all user configurable info, including optional assembler routines */
447 * Added at libpng-1.2.8 */
448 /* Ref MSDN: Private as priority over Special
449 * VS_FF_PRIVATEBUILD File *was not* built using standard release
450 * procedures. If this value is given, the StringFileInfo block must
451 * contain a PrivateBuild string.
453 * VS_FF_SPECIALBUILD File *was* built by the original company using
454 * standard release procedures but is a variation of the standard
455 * file of the same version number. If this value is given, the
456 * StringFileInfo block must contain a SpecialBuild string.
459 #if defined(PNG_USER_PRIVATEBUILD)
460 # define PNG_LIBPNG_BUILD_TYPE \
461 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
463 # if defined(PNG_LIBPNG_SPECIALBUILD)
464 # define PNG_LIBPNG_BUILD_TYPE \
465 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
467 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
471 #ifndef PNG_VERSION_INFO_ONLY
473 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
476 #endif /* __cplusplus */
478 /* This file is arranged in several sections. The first section contains
479 * structure and type definitions. The second section contains the external
480 * library functions, while the third has the internal library functions,
481 * which applications aren't expected to use directly.
484 #ifndef PNG_NO_TYPECAST_NULL
485 #define int_p_NULL (int *)NULL
486 #define png_bytep_NULL (png_bytep)NULL
487 #define png_bytepp_NULL (png_bytepp)NULL
488 #define png_doublep_NULL (png_doublep)NULL
489 #define png_error_ptr_NULL (png_error_ptr)NULL
490 #define png_flush_ptr_NULL (png_flush_ptr)NULL
491 #define png_free_ptr_NULL (png_free_ptr)NULL
492 #define png_infopp_NULL (png_infopp)NULL
493 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
494 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
495 #define png_rw_ptr_NULL (png_rw_ptr)NULL
496 #define png_structp_NULL (png_structp)NULL
497 #define png_uint_16p_NULL (png_uint_16p)NULL
498 #define png_voidp_NULL (png_voidp)NULL
499 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
501 #define int_p_NULL NULL
502 #define png_bytep_NULL NULL
503 #define png_bytepp_NULL NULL
504 #define png_doublep_NULL NULL
505 #define png_error_ptr_NULL NULL
506 #define png_flush_ptr_NULL NULL
507 #define png_free_ptr_NULL NULL
508 #define png_infopp_NULL NULL
509 #define png_malloc_ptr_NULL NULL
510 #define png_read_status_ptr_NULL NULL
511 #define png_rw_ptr_NULL NULL
512 #define png_structp_NULL NULL
513 #define png_uint_16p_NULL NULL
514 #define png_voidp_NULL NULL
515 #define png_write_status_ptr_NULL NULL
518 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
519 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
520 /* Version information for C files, stored in png.c. This had better match
523 #ifdef PNG_USE_GLOBAL_ARRAYS
524 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
525 /* need room for 99.99.99beta99z */
527 #define png_libpng_ver png_get_header_ver(NULL)
530 #ifdef PNG_USE_GLOBAL_ARRAYS
531 /* This was removed in version 1.0.5c */
532 /* Structures to facilitate easy interlacing. See png.c for more details */
533 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
534 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
535 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
536 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
537 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
538 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
539 /* This isn't currently used. If you need it, see png.c for more details.
540 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
544 #endif /* PNG_NO_EXTERN */
546 /* Three color definitions. The order of the red, green, and blue, (and the
547 * exact size) is not important, although the size of the fields need to
548 * be png_byte or png_uint_16 (as defined below).
550 typedef struct png_color_struct
556 typedef png_color FAR * png_colorp;
557 typedef png_color FAR * FAR * png_colorpp;
559 typedef struct png_color_16_struct
561 png_byte index; /* used for palette files */
562 png_uint_16 red; /* for use in red green blue files */
565 png_uint_16 gray; /* for use in grayscale files */
567 typedef png_color_16 FAR * png_color_16p;
568 typedef png_color_16 FAR * FAR * png_color_16pp;
570 typedef struct png_color_8_struct
572 png_byte red; /* for use in red green blue files */
575 png_byte gray; /* for use in grayscale files */
576 png_byte alpha; /* for alpha channel files */
578 typedef png_color_8 FAR * png_color_8p;
579 typedef png_color_8 FAR * FAR * png_color_8pp;
582 * The following two structures are used for the in-core representation
585 typedef struct png_sPLT_entry_struct
591 png_uint_16 frequency;
593 typedef png_sPLT_entry FAR * png_sPLT_entryp;
594 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
596 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
597 * occupy the LSB of their respective members, and the MSB of each member
598 * is zero-filled. The frequency member always occupies the full 16 bits.
601 typedef struct png_sPLT_struct
603 png_charp name; /* palette name */
604 png_byte depth; /* depth of palette samples */
605 png_sPLT_entryp entries; /* palette entries */
606 png_int_32 nentries; /* number of palette entries */
608 typedef png_sPLT_t FAR * png_sPLT_tp;
609 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
611 #ifdef PNG_TEXT_SUPPORTED
612 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
613 * and whether that contents is compressed or not. The "key" field
614 * points to a regular zero-terminated C string. The "text", "lang", and
615 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
616 * However, the * structure returned by png_get_text() will always contain
617 * regular zero-terminated C strings (possibly empty), never NULL pointers,
618 * so they can be safely used in printf() and other string-handling functions.
620 typedef struct png_text_struct
622 int compression; /* compression value:
627 png_charp key; /* keyword, 1-79 character description of "text" */
628 png_charp text; /* comment, may be an empty string (ie "")
630 png_size_t text_length; /* length of the text string */
631 #ifdef PNG_iTXt_SUPPORTED
632 png_size_t itxt_length; /* length of the itxt string */
633 png_charp lang; /* language code, 0-79 characters
635 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
636 chars or a NULL pointer */
639 typedef png_text FAR * png_textp;
640 typedef png_text FAR * FAR * png_textpp;
643 /* Supported compression types for text in PNG files (tEXt, and zTXt).
644 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
645 #define PNG_TEXT_COMPRESSION_NONE_WR -3
646 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
647 #define PNG_TEXT_COMPRESSION_NONE -1
648 #define PNG_TEXT_COMPRESSION_zTXt 0
649 #define PNG_ITXT_COMPRESSION_NONE 1
650 #define PNG_ITXT_COMPRESSION_zTXt 2
651 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
653 /* png_time is a way to hold the time in an machine independent way.
654 * Two conversions are provided, both from time_t and struct tm. There
655 * is no portable way to convert to either of these structures, as far
656 * as I know. If you know of a portable way, send it to me. As a side
657 * note - PNG has always been Year 2000 compliant!
659 typedef struct png_time_struct
661 png_uint_16 year; /* full year, as in, 1995 */
662 png_byte month; /* month of year, 1 - 12 */
663 png_byte day; /* day of month, 1 - 31 */
664 png_byte hour; /* hour of day, 0 - 23 */
665 png_byte minute; /* minute of hour, 0 - 59 */
666 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
668 typedef png_time FAR * png_timep;
669 typedef png_time FAR * FAR * png_timepp;
671 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
672 /* png_unknown_chunk is a structure to hold queued chunks for which there is
673 * no specific support. The idea is that we can use this to queue
674 * up private chunks for output even though the library doesn't actually
675 * know about their semantics.
677 #define PNG_CHUNK_NAME_LENGTH 5
678 typedef struct png_unknown_chunk_t
680 png_byte name[PNG_CHUNK_NAME_LENGTH];
684 /* libpng-using applications should NOT directly modify this byte. */
685 png_byte location; /* mode of operation at read time */
688 typedef png_unknown_chunk FAR * png_unknown_chunkp;
689 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
692 /* png_info is a structure that holds the information in a PNG file so
693 * that the application can find out the characteristics of the image.
694 * If you are reading the file, this structure will tell you what is
695 * in the PNG file. If you are writing the file, fill in the information
696 * you want to put into the PNG file, then call png_write_info().
697 * The names chosen should be very close to the PNG specification, so
698 * consult that document for information about the meaning of each field.
700 * With libpng < 0.95, it was only possible to directly set and read the
701 * the values in the png_info_struct, which meant that the contents and
702 * order of the values had to remain fixed. With libpng 0.95 and later,
703 * however, there are now functions that abstract the contents of
704 * png_info_struct from the application, so this makes it easier to use
705 * libpng with dynamic libraries, and even makes it possible to use
706 * libraries that don't have all of the libpng ancillary chunk-handing
709 * In any case, the order of the parameters in png_info_struct should NOT
710 * be changed for as long as possible to keep compatibility with applications
711 * that use the old direct-access method with png_info_struct.
713 * The following members may have allocated storage attached that should be
714 * cleaned up before the structure is discarded: palette, trans, text,
715 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
716 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
717 * are automatically freed when the info structure is deallocated, if they were
718 * allocated internally by libpng. This behavior can be changed by means
719 * of the png_data_freer() function.
721 * More allocation details: all the chunk-reading functions that
722 * change these members go through the corresponding png_set_*
723 * functions. A function to clear these members is available: see
724 * png_free_data(). The png_set_* functions do not depend on being
725 * able to point info structure members to any of the storage they are
726 * passed (they make their own copies), EXCEPT that the png_set_text
727 * functions use the same storage passed to them in the text_ptr or
728 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
729 * functions do not make their own copies.
731 typedef struct png_info_struct
733 /* the following are necessary for every PNG file */
734 png_uint_32 width; /* width of image in pixels (from IHDR) */
735 png_uint_32 height; /* height of image in pixels (from IHDR) */
736 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
737 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
738 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
739 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
740 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
741 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
742 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
743 /* The following three should have been named *_method not *_type */
744 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
745 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
746 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
748 /* The following is informational only on read, and not used on writes. */
749 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
750 png_byte pixel_depth; /* number of bits per pixel */
751 png_byte spare_byte; /* to align the data, and for future use */
752 png_byte signature[8]; /* magic bytes read by libpng from start of file */
754 /* The rest of the data is optional. If you are reading, check the
755 * valid field to see if the information in these are valid. If you
756 * are writing, set the valid field to those chunks you want written,
757 * and initialize the appropriate fields below.
760 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
761 /* The gAMA chunk describes the gamma characteristics of the system
762 * on which the image was created, normally in the range [1.0, 2.5].
763 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
765 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
768 #if defined(PNG_sRGB_SUPPORTED)
770 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
771 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
774 #if defined(PNG_TEXT_SUPPORTED)
775 /* The tEXt, and zTXt chunks contain human-readable textual data in
776 * uncompressed, compressed, and optionally compressed forms, respectively.
777 * The data in "text" is an array of pointers to uncompressed,
778 * null-terminated C strings. Each chunk has a keyword that describes the
779 * textual data contained in that chunk. Keywords are not required to be
780 * unique, and the text string may be empty. Any number of text chunks may
783 int num_text; /* number of comments read/to write */
784 int max_text; /* current size of text array */
785 png_textp text; /* array of comments read/to write */
786 #endif /* PNG_TEXT_SUPPORTED */
788 #if defined(PNG_tIME_SUPPORTED)
789 /* The tIME chunk holds the last time the displayed image data was
790 * modified. See the png_time struct for the contents of this struct.
795 #if defined(PNG_sBIT_SUPPORTED)
796 /* The sBIT chunk specifies the number of significant high-order bits
797 * in the pixel data. Values are in the range [1, bit_depth], and are
798 * only specified for the channels in the pixel data. The contents of
799 * the low-order bits is not specified. Data is valid if
800 * (valid & PNG_INFO_sBIT) is non-zero.
802 png_color_8 sig_bit; /* significant bits in color channels */
805 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
806 defined(PNG_READ_BACKGROUND_SUPPORTED)
807 /* The tRNS chunk supplies transparency data for paletted images and
808 * other image types that don't need a full alpha channel. There are
809 * "num_trans" transparency values for a paletted image, stored in the
810 * same order as the palette colors, starting from index 0. Values
811 * for the data are in the range [0, 255], ranging from fully transparent
812 * to fully opaque, respectively. For non-paletted images, there is a
813 * single color specified that should be treated as fully transparent.
814 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
816 png_bytep trans; /* transparent values for paletted image */
817 png_color_16 trans_values; /* transparent color for non-palette image */
820 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
821 /* The bKGD chunk gives the suggested image background color if the
822 * display program does not have its own background color and the image
823 * is needs to composited onto a background before display. The colors
824 * in "background" are normally in the same color space/depth as the
825 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
827 png_color_16 background;
830 #if defined(PNG_oFFs_SUPPORTED)
831 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
832 * and downwards from the top-left corner of the display, page, or other
833 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
834 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
836 png_int_32 x_offset; /* x offset on page */
837 png_int_32 y_offset; /* y offset on page */
838 png_byte offset_unit_type; /* offset units type */
841 #if defined(PNG_pHYs_SUPPORTED)
842 /* The pHYs chunk gives the physical pixel density of the image for
843 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
844 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
846 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
847 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
848 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
851 #if defined(PNG_hIST_SUPPORTED)
852 /* The hIST chunk contains the relative frequency or importance of the
853 * various palette entries, so that a viewer can intelligently select a
854 * reduced-color palette, if required. Data is an array of "num_palette"
855 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
861 #ifdef PNG_cHRM_SUPPORTED
862 /* The cHRM chunk describes the CIE color characteristics of the monitor
863 * on which the PNG was created. This data allows the viewer to do gamut
864 * mapping of the input image to ensure that the viewer sees the same
865 * colors in the image as the creator. Values are in the range
866 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
868 #ifdef PNG_FLOATING_POINT_SUPPORTED
880 #if defined(PNG_pCAL_SUPPORTED)
881 /* The pCAL chunk describes a transformation between the stored pixel
882 * values and original physical data values used to create the image.
883 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
884 * range given by [pcal_X0, pcal_X1], and are further transformed by a
885 * (possibly non-linear) transformation function given by "pcal_type"
886 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
887 * defines below, and the PNG-Group's PNG extensions document for a
888 * complete description of the transformations and how they should be
889 * implemented, and for a description of the ASCII parameter strings.
890 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
892 png_charp pcal_purpose; /* pCAL chunk description string */
893 png_int_32 pcal_X0; /* minimum value */
894 png_int_32 pcal_X1; /* maximum value */
895 png_charp pcal_units; /* Latin-1 string giving physical units */
896 png_charpp pcal_params; /* ASCII strings containing parameter values */
897 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
898 png_byte pcal_nparams; /* number of parameters given in pcal_params */
901 /* New members added in libpng-1.0.6 */
902 #ifdef PNG_FREE_ME_SUPPORTED
903 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
906 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
907 /* storage for unknown chunks that the library doesn't recognize. */
908 png_unknown_chunkp unknown_chunks;
909 png_size_t unknown_chunks_num;
912 #if defined(PNG_iCCP_SUPPORTED)
913 /* iCCP chunk data. */
914 png_charp iccp_name; /* profile name */
915 png_charp iccp_profile; /* International Color Consortium profile data */
916 /* Note to maintainer: should be png_bytep */
917 png_uint_32 iccp_proflen; /* ICC profile data length */
918 png_byte iccp_compression; /* Always zero */
921 #if defined(PNG_sPLT_SUPPORTED)
922 /* data on sPLT chunks (there may be more than one). */
923 png_sPLT_tp splt_palettes;
924 png_uint_32 splt_palettes_num;
927 #if defined(PNG_sCAL_SUPPORTED)
928 /* The sCAL chunk describes the actual physical dimensions of the
929 * subject matter of the graphic. The chunk contains a unit specification
930 * a byte value, and two ASCII strings representing floating-point
931 * values. The values are width and height corresponsing to one pixel
932 * in the image. This external representation is converted to double
933 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
935 png_byte scal_unit; /* unit of physical scale */
936 #ifdef PNG_FLOATING_POINT_SUPPORTED
937 double scal_pixel_width; /* width of one pixel */
938 double scal_pixel_height; /* height of one pixel */
940 #ifdef PNG_FIXED_POINT_SUPPORTED
941 png_charp scal_s_width; /* string containing height */
942 png_charp scal_s_height; /* string containing width */
946 #if defined(PNG_INFO_IMAGE_SUPPORTED)
947 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
948 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
949 png_bytepp row_pointers; /* the image bits */
952 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
953 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
956 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
957 png_fixed_point int_x_white;
958 png_fixed_point int_y_white;
959 png_fixed_point int_x_red;
960 png_fixed_point int_y_red;
961 png_fixed_point int_x_green;
962 png_fixed_point int_y_green;
963 png_fixed_point int_x_blue;
964 png_fixed_point int_y_blue;
969 typedef png_info FAR * png_infop;
970 typedef png_info FAR * FAR * png_infopp;
972 /* Maximum positive integer used in PNG is (2^31)-1 */
973 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
974 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
975 #define PNG_SIZE_MAX ((png_size_t)(-1))
976 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
977 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
978 #define PNG_MAX_UINT PNG_UINT_31_MAX
981 /* These describe the color_type field in png_info. */
982 /* color type masks */
983 #define PNG_COLOR_MASK_PALETTE 1
984 #define PNG_COLOR_MASK_COLOR 2
985 #define PNG_COLOR_MASK_ALPHA 4
987 /* color types. Note that not all combinations are legal */
988 #define PNG_COLOR_TYPE_GRAY 0
989 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
990 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
991 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
992 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
994 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
995 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
997 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
998 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
999 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1001 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
1002 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1003 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1004 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1006 /* These are for the interlacing type. These values should NOT be changed. */
1007 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1008 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1009 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
1011 /* These are for the oFFs chunk. These values should NOT be changed. */
1012 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1013 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1014 #define PNG_OFFSET_LAST 2 /* Not a valid value */
1016 /* These are for the pCAL chunk. These values should NOT be changed. */
1017 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1018 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1019 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1020 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1021 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1023 /* These are for the sCAL chunk. These values should NOT be changed. */
1024 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1025 #define PNG_SCALE_METER 1 /* meters per pixel */
1026 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1027 #define PNG_SCALE_LAST 3 /* Not a valid value */
1029 /* These are for the pHYs chunk. These values should NOT be changed. */
1030 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1031 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1032 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1034 /* These are for the sRGB chunk. These values should NOT be changed. */
1035 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1036 #define PNG_sRGB_INTENT_RELATIVE 1
1037 #define PNG_sRGB_INTENT_SATURATION 2
1038 #define PNG_sRGB_INTENT_ABSOLUTE 3
1039 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1041 /* This is for text chunks */
1042 #define PNG_KEYWORD_MAX_LENGTH 79
1044 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1045 #define PNG_MAX_PALETTE_LENGTH 256
1047 /* These determine if an ancillary chunk's data has been successfully read
1048 * from the PNG header, or if the application has filled in the corresponding
1049 * data in the info_struct to be written into the output file. The values
1050 * of the PNG_INFO_<chunk> defines should NOT be changed.
1052 #define PNG_INFO_gAMA 0x0001
1053 #define PNG_INFO_sBIT 0x0002
1054 #define PNG_INFO_cHRM 0x0004
1055 #define PNG_INFO_PLTE 0x0008
1056 #define PNG_INFO_tRNS 0x0010
1057 #define PNG_INFO_bKGD 0x0020
1058 #define PNG_INFO_hIST 0x0040
1059 #define PNG_INFO_pHYs 0x0080
1060 #define PNG_INFO_oFFs 0x0100
1061 #define PNG_INFO_tIME 0x0200
1062 #define PNG_INFO_pCAL 0x0400
1063 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1064 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1065 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1066 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1067 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1069 /* This is used for the transformation routines, as some of them
1070 * change these values for the row. It also should enable using
1071 * the routines for other purposes.
1073 typedef struct png_row_info_struct
1075 png_uint_32 width; /* width of row */
1076 png_uint_32 rowbytes; /* number of bytes in row */
1077 png_byte color_type; /* color type of row */
1078 png_byte bit_depth; /* bit depth of row */
1079 png_byte channels; /* number of channels (1, 2, 3, or 4) */
1080 png_byte pixel_depth; /* bits per pixel (depth * channels) */
1083 typedef png_row_info FAR * png_row_infop;
1084 typedef png_row_info FAR * FAR * png_row_infopp;
1086 /* These are the function types for the I/O functions and for the functions
1087 * that allow the user to override the default I/O functions with his or her
1088 * own. The png_error_ptr type should match that of user-supplied warning
1089 * and error functions, while the png_rw_ptr type should match that of the
1090 * user read/write data functions.
1092 typedef struct png_struct_def png_struct;
1093 typedef png_struct FAR * png_structp;
1095 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1096 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1097 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1098 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1100 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1103 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1104 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1105 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1106 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1110 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1111 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1112 defined(PNG_LEGACY_SUPPORTED)
1113 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1114 png_row_infop, png_bytep));
1117 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1118 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1120 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1121 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1124 /* Transform masks for the high-level interface */
1125 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1126 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1127 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1128 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1129 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1130 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1131 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1132 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1133 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1134 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1135 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1136 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1137 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1139 /* Flags for MNG supported features */
1140 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1141 #define PNG_FLAG_MNG_FILTER_64 0x04
1142 #define PNG_ALL_MNG_FEATURES 0x05
1144 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1145 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1147 /* The structure that holds the information to read and write PNG files.
1148 * The only people who need to care about what is inside of this are the
1149 * people who will be modifying the library for their own special needs.
1150 * It should NOT be accessed directly by an application, except to store
1154 struct png_struct_def
1156 #ifdef PNG_SETJMP_SUPPORTED
1157 jmp_buf jmpbuf; /* used in png_error */
1159 png_error_ptr error_fn; /* function for printing errors and aborting */
1160 png_error_ptr warning_fn; /* function for printing warnings */
1161 png_voidp error_ptr; /* user supplied struct for error functions */
1162 png_rw_ptr write_data_fn; /* function for writing output data */
1163 png_rw_ptr read_data_fn; /* function for reading input data */
1164 png_voidp io_ptr; /* ptr to application struct for I/O functions */
1166 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1167 png_user_transform_ptr read_user_transform_fn; /* user read transform */
1170 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1171 png_user_transform_ptr write_user_transform_fn; /* user write transform */
1174 /* These were added in libpng-1.0.2 */
1175 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1176 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1177 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1178 png_voidp user_transform_ptr; /* user supplied struct for user transform */
1179 png_byte user_transform_depth; /* bit depth of user transformed pixels */
1180 png_byte user_transform_channels; /* channels in user transformed pixels */
1184 png_uint_32 mode; /* tells us where we are in the PNG file */
1185 png_uint_32 flags; /* flags indicating various things to libpng */
1186 png_uint_32 transformations; /* which transformations to perform */
1188 z_stream zstream; /* pointer to decompression structure (below) */
1189 png_bytep zbuf; /* buffer for zlib */
1190 png_size_t zbuf_size; /* size of zbuf */
1191 int zlib_level; /* holds zlib compression level */
1192 int zlib_method; /* holds zlib compression method */
1193 int zlib_window_bits; /* holds zlib compression window bits */
1194 int zlib_mem_level; /* holds zlib compression memory level */
1195 int zlib_strategy; /* holds zlib compression strategy */
1197 png_uint_32 width; /* width of image in pixels */
1198 png_uint_32 height; /* height of image in pixels */
1199 png_uint_32 num_rows; /* number of rows in current pass */
1200 png_uint_32 usr_width; /* width of row at start of write */
1201 png_uint_32 rowbytes; /* size of row in bytes */
1202 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1203 png_uint_32 iwidth; /* width of current interlaced row in pixels */
1204 png_uint_32 row_number; /* current row in interlace pass */
1205 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1206 png_bytep row_buf; /* buffer to save current (unfiltered) row */
1207 #ifndef PNG_NO_WRITE_FILTERING
1208 png_bytep sub_row; /* buffer to save "sub" row when filtering */
1209 png_bytep up_row; /* buffer to save "up" row when filtering */
1210 png_bytep avg_row; /* buffer to save "avg" row when filtering */
1211 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1213 png_row_info row_info; /* used for transformation routines */
1215 png_uint_32 idat_size; /* current IDAT size for read */
1216 png_uint_32 crc; /* current chunk CRC value */
1217 png_colorp palette; /* palette from the input file */
1218 png_uint_16 num_palette; /* number of color entries in palette */
1219 png_uint_16 num_trans; /* number of transparency values */
1220 png_byte chunk_name[5]; /* null-terminated name of current chunk */
1221 png_byte compression; /* file compression type (always 0) */
1222 png_byte filter; /* file filter type (always 0) */
1223 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1224 png_byte pass; /* current interlace pass (0 - 6) */
1225 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1226 png_byte color_type; /* color type of file */
1227 png_byte bit_depth; /* bit depth of file */
1228 png_byte usr_bit_depth; /* bit depth of users row */
1229 png_byte pixel_depth; /* number of bits per pixel */
1230 png_byte channels; /* number of channels in file */
1231 png_byte usr_channels; /* channels at start of write */
1232 png_byte sig_bytes; /* magic bytes read/written from start of file */
1234 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1235 #ifdef PNG_LEGACY_SUPPORTED
1236 png_byte filler; /* filler byte for pixel expansion */
1238 png_uint_16 filler; /* filler bytes for pixel expansion */
1242 #if defined(PNG_bKGD_SUPPORTED)
1243 png_byte background_gamma_type;
1244 # ifdef PNG_FLOATING_POINT_SUPPORTED
1245 float background_gamma;
1247 png_color_16 background; /* background color in screen gamma space */
1248 #if defined(PNG_READ_GAMMA_SUPPORTED)
1249 png_color_16 background_1; /* background normalized to gamma 1.0 */
1251 #endif /* PNG_bKGD_SUPPORTED */
1253 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1254 png_flush_ptr output_flush_fn;/* Function for flushing output */
1255 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1256 png_uint_32 flush_rows; /* number of rows written since last flush */
1259 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1260 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1261 #ifdef PNG_FLOATING_POINT_SUPPORTED
1262 float gamma; /* file gamma value */
1263 float screen_gamma; /* screen gamma value (display_exponent) */
1267 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1268 png_bytep gamma_table; /* gamma table for 8-bit depth files */
1269 png_bytep gamma_from_1; /* converts from 1.0 to screen */
1270 png_bytep gamma_to_1; /* converts from file to 1.0 */
1271 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1272 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1273 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1276 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1277 png_color_8 sig_bit; /* significant bits in each available channel */
1280 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1281 png_color_8 shift; /* shift for significant bit tranformation */
1284 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1285 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1286 png_bytep trans; /* transparency values for paletted files */
1287 png_color_16 trans_values; /* transparency values for non-paletted files */
1290 png_read_status_ptr read_row_fn; /* called after each row is decoded */
1291 png_write_status_ptr write_row_fn; /* called after each row is encoded */
1292 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1293 png_progressive_info_ptr info_fn; /* called after header data fully read */
1294 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1295 png_progressive_end_ptr end_fn; /* called after image is complete */
1296 png_bytep save_buffer_ptr; /* current location in save_buffer */
1297 png_bytep save_buffer; /* buffer for previously read data */
1298 png_bytep current_buffer_ptr; /* current location in current_buffer */
1299 png_bytep current_buffer; /* buffer for recently used data */
1300 png_uint_32 push_length; /* size of current input chunk */
1301 png_uint_32 skip_length; /* bytes to skip in input data */
1302 png_size_t save_buffer_size; /* amount of data now in save_buffer */
1303 png_size_t save_buffer_max; /* total size of save_buffer */
1304 png_size_t buffer_size; /* total amount of available input data */
1305 png_size_t current_buffer_size; /* amount of data now in current_buffer */
1306 int process_mode; /* what push library is currently doing */
1307 int cur_palette; /* current push library palette index */
1309 # if defined(PNG_TEXT_SUPPORTED)
1310 png_size_t current_text_size; /* current size of text input data */
1311 png_size_t current_text_left; /* how much text left to read in input */
1312 png_charp current_text; /* current text chunk buffer */
1313 png_charp current_text_ptr; /* current location in current_text */
1314 # endif /* PNG_TEXT_SUPPORTED */
1315 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1317 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1318 /* for the Borland special 64K segment handler */
1319 png_bytepp offset_table_ptr;
1320 png_bytep offset_table;
1321 png_uint_16 offset_table_number;
1322 png_uint_16 offset_table_count;
1323 png_uint_16 offset_table_count_free;
1326 #if defined(PNG_READ_DITHER_SUPPORTED)
1327 png_bytep palette_lookup; /* lookup table for dithering */
1328 png_bytep dither_index; /* index translation for palette files */
1331 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1332 png_uint_16p hist; /* histogram */
1335 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1336 png_byte heuristic_method; /* heuristic for row filter selection */
1337 png_byte num_prev_filters; /* number of weights for previous rows */
1338 png_bytep prev_filters; /* filter type(s) of previous row(s) */
1339 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1340 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1341 png_uint_16p filter_costs; /* relative filter calculation cost */
1342 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1345 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1346 png_charp time_buffer; /* String to hold RFC 1123 time text */
1349 /* New members added in libpng-1.0.6 */
1351 #ifdef PNG_FREE_ME_SUPPORTED
1352 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1355 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1356 png_voidp user_chunk_ptr;
1357 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1360 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1362 png_bytep chunk_list;
1365 /* New members added in libpng-1.0.3 */
1366 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1367 png_byte rgb_to_gray_status;
1368 /* These were changed from png_byte in libpng-1.0.6 */
1369 png_uint_16 rgb_to_gray_red_coeff;
1370 png_uint_16 rgb_to_gray_green_coeff;
1371 png_uint_16 rgb_to_gray_blue_coeff;
1374 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1375 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1376 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1377 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1378 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1380 png_byte mng_features_permitted;
1382 png_uint_32 mng_features_permitted;
1383 #endif /* PNG_1_0_X */
1386 /* New member added in libpng-1.0.7 */
1387 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1388 png_fixed_point int_gamma;
1391 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1392 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1393 png_byte filter_type;
1396 #if defined(PNG_1_0_X)
1397 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1398 png_uint_32 row_buf_size;
1401 /* New members added in libpng-1.2.0 */
1402 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1403 # if !defined(PNG_1_0_X)
1404 # if defined(PNG_MMX_CODE_SUPPORTED)
1405 png_byte mmx_bitdepth_threshold;
1406 png_uint_32 mmx_rowbytes_threshold;
1408 png_uint_32 asm_flags;
1412 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1413 #ifdef PNG_USER_MEM_SUPPORTED
1414 png_voidp mem_ptr; /* user supplied struct for mem functions */
1415 png_malloc_ptr malloc_fn; /* function for allocating memory */
1416 png_free_ptr free_fn; /* function for freeing memory */
1419 /* New member added in libpng-1.0.13 and 1.2.0 */
1420 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1422 #if defined(PNG_READ_DITHER_SUPPORTED)
1423 /* The following three members were added at version 1.0.14 and 1.2.4 */
1424 png_bytep dither_sort; /* working sort array */
1425 png_bytep index_to_palette; /* where the original index currently is */
1426 /* in the palette */
1427 png_bytep palette_to_index; /* which original index points to this */
1431 /* New members added in libpng-1.0.16 and 1.2.6 */
1432 png_byte compression_type;
1434 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1435 png_uint_32 user_width_max;
1436 png_uint_32 user_height_max;
1439 /* New member added in libpng-1.0.25 and 1.2.17 */
1440 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1441 /* storage for unknown chunk that the library doesn't recognize. */
1442 png_unknown_chunk unknown_chunk;
1445 /* New members added in libpng-1.2.26 */
1446 png_uint_32 old_big_row_buf_size, old_prev_row_size;
1450 /* This triggers a compiler error in png.c, if png.c and png.h
1451 * do not agree upon the version number.
1453 typedef png_structp version_1_2_29;
1455 typedef png_struct FAR * FAR * png_structpp;
1457 /* Here are the function definitions most commonly used. This is not
1458 * the place to find out how to use libpng. See libpng.txt for the
1459 * full explanation, see example.c for the summary. This just provides
1460 * a simple one line description of the use of each function.
1463 /* Returns the version number of the library */
1464 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1466 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1467 * Handling more than 8 bytes from the beginning of the file is an error.
1469 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1472 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1473 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1474 * signature, and non-zero otherwise. Having num_to_check == 0 or
1475 * start > 7 will always fail (ie return non-zero).
1477 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1478 png_size_t num_to_check));
1480 /* Simple signature checking function. This is the same as calling
1481 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1483 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1485 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1486 extern PNG_EXPORT(png_structp,png_create_read_struct)
1487 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1488 png_error_ptr error_fn, png_error_ptr warn_fn));
1490 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1491 extern PNG_EXPORT(png_structp,png_create_write_struct)
1492 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1493 png_error_ptr error_fn, png_error_ptr warn_fn));
1495 #ifdef PNG_WRITE_SUPPORTED
1496 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1497 PNGARG((png_structp png_ptr));
1500 #ifdef PNG_WRITE_SUPPORTED
1501 extern PNG_EXPORT(void,png_set_compression_buffer_size)
1502 PNGARG((png_structp png_ptr, png_uint_32 size));
1505 /* Reset the compression stream */
1506 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1508 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1509 #ifdef PNG_USER_MEM_SUPPORTED
1510 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1511 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1512 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1513 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1514 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1515 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1516 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1517 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1520 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1521 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1522 png_bytep chunk_name, png_bytep data, png_size_t length));
1524 /* Write the start of a PNG chunk - length and chunk name. */
1525 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1526 png_bytep chunk_name, png_uint_32 length));
1528 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1529 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1530 png_bytep data, png_size_t length));
1532 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1533 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1535 /* Allocate and initialize the info structure */
1536 extern PNG_EXPORT(png_infop,png_create_info_struct)
1537 PNGARG((png_structp png_ptr));
1539 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1540 /* Initialize the info structure (old interface - DEPRECATED) */
1541 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1542 #undef png_info_init
1543 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1544 png_sizeof(png_info));
1547 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1548 png_size_t png_info_struct_size));
1550 /* Writes all the PNG information before the image. */
1551 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1552 png_infop info_ptr));
1553 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1554 png_infop info_ptr));
1556 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1557 /* read the information before the actual image data. */
1558 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1559 png_infop info_ptr));
1562 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1563 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1564 PNGARG((png_structp png_ptr, png_timep ptime));
1567 #if !defined(_WIN32_WCE)
1568 /* "time.h" functions are not supported on WindowsCE */
1569 #if defined(PNG_WRITE_tIME_SUPPORTED)
1570 /* convert from a struct tm to png_time */
1571 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1572 struct tm FAR * ttime));
1574 /* convert from time_t to png_time. Uses gmtime() */
1575 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1577 #endif /* PNG_WRITE_tIME_SUPPORTED */
1578 #endif /* _WIN32_WCE */
1580 #if defined(PNG_READ_EXPAND_SUPPORTED)
1581 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1582 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1583 #if !defined(PNG_1_0_X)
1584 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1587 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1588 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1589 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1591 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1595 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1596 /* Use blue, green, red order for pixels. */
1597 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1600 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1601 /* Expand the grayscale to 24-bit RGB if necessary. */
1602 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1605 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1606 /* Reduce RGB to grayscale. */
1607 #ifdef PNG_FLOATING_POINT_SUPPORTED
1608 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1609 int error_action, double red, double green ));
1611 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1612 int error_action, png_fixed_point red, png_fixed_point green ));
1613 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1617 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1618 png_colorp palette));
1620 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1621 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1624 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1625 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1626 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1629 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1630 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1631 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1634 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1635 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1636 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1637 png_uint_32 filler, int flags));
1638 /* The values of the PNG_FILLER_ defines should NOT be changed */
1639 #define PNG_FILLER_BEFORE 0
1640 #define PNG_FILLER_AFTER 1
1641 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1642 #if !defined(PNG_1_0_X)
1643 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1644 png_uint_32 filler, int flags));
1646 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1648 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1649 /* Swap bytes in 16-bit depth files. */
1650 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1653 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1654 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1655 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1658 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1659 /* Swap packing order of pixels in bytes. */
1660 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1663 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1664 /* Converts files to legal bit depths. */
1665 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1666 png_color_8p true_bits));
1669 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1670 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1671 /* Have the code handle the interlacing. Returns the number of passes. */
1672 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1675 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1676 /* Invert monochrome files */
1677 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1680 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1681 /* Handle alpha and tRNS by replacing with a background color. */
1682 #ifdef PNG_FLOATING_POINT_SUPPORTED
1683 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1684 png_color_16p background_color, int background_gamma_code,
1685 int need_expand, double background_gamma));
1687 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1688 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1689 #define PNG_BACKGROUND_GAMMA_FILE 2
1690 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1693 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1694 /* strip the second byte of information from a 16-bit depth file. */
1695 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1698 #if defined(PNG_READ_DITHER_SUPPORTED)
1699 /* Turn on dithering, and reduce the palette to the number of colors available. */
1700 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1701 png_colorp palette, int num_palette, int maximum_colors,
1702 png_uint_16p histogram, int full_dither));
1705 #if defined(PNG_READ_GAMMA_SUPPORTED)
1706 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1707 #ifdef PNG_FLOATING_POINT_SUPPORTED
1708 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1709 double screen_gamma, double default_file_gamma));
1713 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1714 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1715 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1716 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1717 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1718 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1719 int empty_plte_permitted));
1723 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1724 /* Set how many lines between output flushes - 0 for no flushing */
1725 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1726 /* Flush the current PNG output buffer */
1727 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1730 /* optional update palette with requested transformations */
1731 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1733 /* optional call to update the users info structure */
1734 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1735 png_infop info_ptr));
1737 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1738 /* read one or more rows of image data. */
1739 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1740 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1743 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1744 /* read a row of data. */
1745 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1747 png_bytep display_row));
1750 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1751 /* read the whole image into memory at once. */
1752 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1756 /* write a row of image data */
1757 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1760 /* write a few rows of image data */
1761 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1762 png_bytepp row, png_uint_32 num_rows));
1764 /* write the image data */
1765 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1768 /* writes the end of the PNG file. */
1769 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1770 png_infop info_ptr));
1772 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1773 /* read the end of the PNG file. */
1774 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1775 png_infop info_ptr));
1778 /* free any memory associated with the png_info_struct */
1779 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1780 png_infopp info_ptr_ptr));
1782 /* free any memory associated with the png_struct and the png_info_structs */
1783 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1784 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1786 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1787 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1788 png_infop end_info_ptr));
1790 /* free any memory associated with the png_struct and the png_info_structs */
1791 extern PNG_EXPORT(void,png_destroy_write_struct)
1792 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1794 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1795 extern void png_write_destroy PNGARG((png_structp png_ptr));
1797 /* set the libpng method of handling chunk CRC errors */
1798 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1799 int crit_action, int ancil_action));
1801 /* Values for png_set_crc_action() to say how to handle CRC errors in
1802 * ancillary and critical chunks, and whether to use the data contained
1803 * therein. Note that it is impossible to "discard" data in a critical
1804 * chunk. For versions prior to 0.90, the action was always error/quit,
1805 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1806 * chunks is warn/discard. These values should NOT be changed.
1808 * value action:critical action:ancillary
1810 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1811 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1812 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1813 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1814 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1815 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1817 /* These functions give the user control over the scan-line filtering in
1818 * libpng and the compression methods used by zlib. These functions are
1819 * mainly useful for testing, as the defaults should work with most users.
1820 * Those users who are tight on memory or want faster performance at the
1821 * expense of compression can modify them. See the compression library
1822 * header file (zlib.h) for an explination of the compression functions.
1825 /* set the filtering method(s) used by libpng. Currently, the only valid
1826 * value for "method" is 0.
1828 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1831 /* Flags for png_set_filter() to say which filters to use. The flags
1832 * are chosen so that they don't conflict with real filter types
1833 * below, in case they are supplied instead of the #defined constants.
1834 * These values should NOT be changed.
1836 #define PNG_NO_FILTERS 0x00
1837 #define PNG_FILTER_NONE 0x08
1838 #define PNG_FILTER_SUB 0x10
1839 #define PNG_FILTER_UP 0x20
1840 #define PNG_FILTER_AVG 0x40
1841 #define PNG_FILTER_PAETH 0x80
1842 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1843 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1845 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1846 * These defines should NOT be changed.
1848 #define PNG_FILTER_VALUE_NONE 0
1849 #define PNG_FILTER_VALUE_SUB 1
1850 #define PNG_FILTER_VALUE_UP 2
1851 #define PNG_FILTER_VALUE_AVG 3
1852 #define PNG_FILTER_VALUE_PAETH 4
1853 #define PNG_FILTER_VALUE_LAST 5
1855 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1856 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1857 * defines, either the default (minimum-sum-of-absolute-differences), or
1858 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1860 * Weights are factors >= 1.0, indicating how important it is to keep the
1861 * filter type consistent between rows. Larger numbers mean the current
1862 * filter is that many times as likely to be the same as the "num_weights"
1863 * previous filters. This is cumulative for each previous row with a weight.
1864 * There needs to be "num_weights" values in "filter_weights", or it can be
1865 * NULL if the weights aren't being specified. Weights have no influence on
1866 * the selection of the first row filter. Well chosen weights can (in theory)
1867 * improve the compression for a given image.
1869 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1870 * filter type. Higher costs indicate more decoding expense, and are
1871 * therefore less likely to be selected over a filter with lower computational
1872 * costs. There needs to be a value in "filter_costs" for each valid filter
1873 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1874 * setting the costs. Costs try to improve the speed of decompression without
1875 * unduly increasing the compressed image size.
1877 * A negative weight or cost indicates the default value is to be used, and
1878 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1879 * The default values for both weights and costs are currently 1.0, but may
1880 * change if good general weighting/cost heuristics can be found. If both
1881 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1882 * to the UNWEIGHTED method, but with added encoding time/computation.
1884 #ifdef PNG_FLOATING_POINT_SUPPORTED
1885 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1886 int heuristic_method, int num_weights, png_doublep filter_weights,
1887 png_doublep filter_costs));
1889 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1891 /* Heuristic used for row filter selection. These defines should NOT be
1894 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1895 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1896 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1897 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1899 /* Set the library compression level. Currently, valid values range from
1900 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1901 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1902 * shown that zlib compression levels 3-6 usually perform as well as level 9
1903 * for PNG images, and do considerably fewer caclulations. In the future,
1904 * these values may not correspond directly to the zlib compression levels.
1906 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1909 extern PNG_EXPORT(void,png_set_compression_mem_level)
1910 PNGARG((png_structp png_ptr, int mem_level));
1912 extern PNG_EXPORT(void,png_set_compression_strategy)
1913 PNGARG((png_structp png_ptr, int strategy));
1915 extern PNG_EXPORT(void,png_set_compression_window_bits)
1916 PNGARG((png_structp png_ptr, int window_bits));
1918 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1921 /* These next functions are called for input/output, memory, and error
1922 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1923 * and call standard C I/O routines such as fread(), fwrite(), and
1924 * fprintf(). These functions can be made to use other I/O routines
1925 * at run time for those applications that need to handle I/O in a
1926 * different manner by calling png_set_???_fn(). See libpng.txt for
1930 #if !defined(PNG_NO_STDIO)
1931 /* Initialize the input/output for the PNG file to the default functions. */
1932 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1935 /* Replace the (error and abort), and warning functions with user
1936 * supplied functions. If no messages are to be printed you must still
1937 * write and use replacement functions. The replacement error_fn should
1938 * still do a longjmp to the last setjmp location if you are using this
1939 * method of error handling. If error_fn or warning_fn is NULL, the
1940 * default function will be used.
1943 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1944 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1946 /* Return the user pointer associated with the error functions */
1947 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1949 /* Replace the default data output functions with a user supplied one(s).
1950 * If buffered output is not used, then output_flush_fn can be set to NULL.
1951 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1952 * output_flush_fn will be ignored (and thus can be NULL).
1954 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1955 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1957 /* Replace the default data input function with a user supplied one. */
1958 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1959 png_voidp io_ptr, png_rw_ptr read_data_fn));
1961 /* Return the user pointer associated with the I/O functions */
1962 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1964 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1965 png_read_status_ptr read_row_fn));
1967 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1968 png_write_status_ptr write_row_fn));
1970 #ifdef PNG_USER_MEM_SUPPORTED
1971 /* Replace the default memory allocation functions with user supplied one(s). */
1972 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1973 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1974 /* Return the user pointer associated with the memory functions */
1975 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
1978 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1979 defined(PNG_LEGACY_SUPPORTED)
1980 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
1981 png_ptr, png_user_transform_ptr read_user_transform_fn));
1984 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1985 defined(PNG_LEGACY_SUPPORTED)
1986 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
1987 png_ptr, png_user_transform_ptr write_user_transform_fn));
1990 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1991 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1992 defined(PNG_LEGACY_SUPPORTED)
1993 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
1994 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
1995 int user_transform_channels));
1996 /* Return the user pointer associated with the user transform functions */
1997 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
1998 PNGARG((png_structp png_ptr));
2001 #ifdef PNG_USER_CHUNKS_SUPPORTED
2002 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2003 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2004 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2008 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2009 /* Sets the function callbacks for the push reader, and a pointer to a
2010 * user-defined structure available to the callback functions.
2012 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2013 png_voidp progressive_ptr,
2014 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2015 png_progressive_end_ptr end_fn));
2017 /* returns the user pointer associated with the push read functions */
2018 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2019 PNGARG((png_structp png_ptr));
2021 /* function to be called when data becomes available */
2022 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2023 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2025 /* function that combines rows. Not very much different than the
2026 * png_combine_row() call. Is this even used?????
2028 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2029 png_bytep old_row, png_bytep new_row));
2030 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2032 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2035 #if defined(PNG_1_0_X)
2036 # define png_malloc_warn png_malloc
2038 /* Added at libpng version 1.2.4 */
2039 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2043 /* frees a pointer allocated by png_malloc() */
2044 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2046 #if defined(PNG_1_0_X)
2047 /* Function to allocate memory for zlib. */
2048 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2051 /* Function to free memory for zlib */
2052 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2055 /* Free data that was allocated internally */
2056 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2057 png_infop info_ptr, png_uint_32 free_me, int num));
2058 #ifdef PNG_FREE_ME_SUPPORTED
2059 /* Reassign responsibility for freeing existing data, whether allocated
2060 * by libpng or by the application */
2061 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2062 png_infop info_ptr, int freer, png_uint_32 mask));
2064 /* assignments for png_data_freer */
2065 #define PNG_DESTROY_WILL_FREE_DATA 1
2066 #define PNG_SET_WILL_FREE_DATA 1
2067 #define PNG_USER_WILL_FREE_DATA 2
2068 /* Flags for png_ptr->free_me and info_ptr->free_me */
2069 #define PNG_FREE_HIST 0x0008
2070 #define PNG_FREE_ICCP 0x0010
2071 #define PNG_FREE_SPLT 0x0020
2072 #define PNG_FREE_ROWS 0x0040
2073 #define PNG_FREE_PCAL 0x0080
2074 #define PNG_FREE_SCAL 0x0100
2075 #define PNG_FREE_UNKN 0x0200
2076 #define PNG_FREE_LIST 0x0400
2077 #define PNG_FREE_PLTE 0x1000
2078 #define PNG_FREE_TRNS 0x2000
2079 #define PNG_FREE_TEXT 0x4000
2080 #define PNG_FREE_ALL 0x7fff
2081 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2083 #ifdef PNG_USER_MEM_SUPPORTED
2084 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2086 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2090 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2091 png_voidp s1, png_voidp s2, png_uint_32 size));
2093 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2094 png_voidp s1, int value, png_uint_32 size));
2096 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2097 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2099 #endif /* USE_FAR_KEYWORD */
2101 #ifndef PNG_NO_ERROR_TEXT
2102 /* Fatal error in PNG image of libpng - can't continue */
2103 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2104 png_const_charp error_message));
2106 /* The same, but the chunk name is prepended to the error string. */
2107 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2108 png_const_charp error_message));
2110 /* Fatal error in PNG image of libpng - can't continue */
2111 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
2114 #ifndef PNG_NO_WARNINGS
2115 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2116 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2117 png_const_charp warning_message));
2119 #ifdef PNG_READ_SUPPORTED
2120 /* Non-fatal error in libpng, chunk name is prepended to message. */
2121 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2122 png_const_charp warning_message));
2123 #endif /* PNG_READ_SUPPORTED */
2124 #endif /* PNG_NO_WARNINGS */
2126 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2127 * Similarly, the png_get_<chunk> calls are used to read values from the
2128 * png_info_struct, either storing the parameters in the passed variables, or
2129 * setting pointers into the png_info_struct where the data is stored. The
2130 * png_get_<chunk> functions return a non-zero value if the data was available
2131 * in info_ptr, or return zero and do not change any of the parameters if the
2132 * data was not available.
2134 * These functions should be used instead of directly accessing png_info
2135 * to avoid problems with future changes in the size and internal layout of
2138 /* Returns "flag" if chunk data is valid in info_ptr. */
2139 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2140 png_infop info_ptr, png_uint_32 flag));
2142 /* Returns number of bytes needed to hold a transformed row. */
2143 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2144 png_infop info_ptr));
2146 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2147 /* Returns row_pointers, which is an array of pointers to scanlines that was
2148 returned from png_read_png(). */
2149 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2150 png_infop info_ptr));
2151 /* Set row_pointers, which is an array of pointers to scanlines for use
2152 by png_write_png(). */
2153 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2154 png_infop info_ptr, png_bytepp row_pointers));
2157 /* Returns number of color channels in image. */
2158 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2159 png_infop info_ptr));
2161 #ifdef PNG_EASY_ACCESS_SUPPORTED
2162 /* Returns image width in pixels. */
2163 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2164 png_ptr, png_infop info_ptr));
2166 /* Returns image height in pixels. */
2167 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2168 png_ptr, png_infop info_ptr));
2170 /* Returns image bit_depth. */
2171 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2172 png_ptr, png_infop info_ptr));
2174 /* Returns image color_type. */
2175 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2176 png_ptr, png_infop info_ptr));
2178 /* Returns image filter_type. */
2179 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2180 png_ptr, png_infop info_ptr));
2182 /* Returns image interlace_type. */
2183 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2184 png_ptr, png_infop info_ptr));
2186 /* Returns image compression_type. */
2187 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2188 png_ptr, png_infop info_ptr));
2190 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2191 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2192 png_ptr, png_infop info_ptr));
2193 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2194 png_ptr, png_infop info_ptr));
2195 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2196 png_ptr, png_infop info_ptr));
2198 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2199 #ifdef PNG_FLOATING_POINT_SUPPORTED
2200 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2201 png_ptr, png_infop info_ptr));
2204 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2205 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2206 png_ptr, png_infop info_ptr));
2207 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2208 png_ptr, png_infop info_ptr));
2209 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2210 png_ptr, png_infop info_ptr));
2211 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2212 png_ptr, png_infop info_ptr));
2214 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2216 /* Returns pointer to signature string read from PNG header */
2217 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2218 png_infop info_ptr));
2220 #if defined(PNG_bKGD_SUPPORTED)
2221 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2222 png_infop info_ptr, png_color_16p *background));
2225 #if defined(PNG_bKGD_SUPPORTED)
2226 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2227 png_infop info_ptr, png_color_16p background));
2230 #if defined(PNG_cHRM_SUPPORTED)
2231 #ifdef PNG_FLOATING_POINT_SUPPORTED
2232 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2233 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2234 double *red_y, double *green_x, double *green_y, double *blue_x,
2237 #ifdef PNG_FIXED_POINT_SUPPORTED
2238 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2239 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2240 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2241 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2242 *int_blue_x, png_fixed_point *int_blue_y));
2246 #if defined(PNG_cHRM_SUPPORTED)
2247 #ifdef PNG_FLOATING_POINT_SUPPORTED
2248 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2249 png_infop info_ptr, double white_x, double white_y, double red_x,
2250 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2252 #ifdef PNG_FIXED_POINT_SUPPORTED
2253 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2254 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2255 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2256 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2257 png_fixed_point int_blue_y));
2261 #if defined(PNG_gAMA_SUPPORTED)
2262 #ifdef PNG_FLOATING_POINT_SUPPORTED
2263 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2264 png_infop info_ptr, double *file_gamma));
2266 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2267 png_infop info_ptr, png_fixed_point *int_file_gamma));
2270 #if defined(PNG_gAMA_SUPPORTED)
2271 #ifdef PNG_FLOATING_POINT_SUPPORTED
2272 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2273 png_infop info_ptr, double file_gamma));
2275 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2276 png_infop info_ptr, png_fixed_point int_file_gamma));
2279 #if defined(PNG_hIST_SUPPORTED)
2280 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2281 png_infop info_ptr, png_uint_16p *hist));
2284 #if defined(PNG_hIST_SUPPORTED)
2285 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2286 png_infop info_ptr, png_uint_16p hist));
2289 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2290 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2291 int *bit_depth, int *color_type, int *interlace_method,
2292 int *compression_method, int *filter_method));
2294 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2295 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2296 int color_type, int interlace_method, int compression_method,
2297 int filter_method));
2299 #if defined(PNG_oFFs_SUPPORTED)
2300 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2301 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2305 #if defined(PNG_oFFs_SUPPORTED)
2306 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2307 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2311 #if defined(PNG_pCAL_SUPPORTED)
2312 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2313 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2314 int *type, int *nparams, png_charp *units, png_charpp *params));
2317 #if defined(PNG_pCAL_SUPPORTED)
2318 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2319 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2320 int type, int nparams, png_charp units, png_charpp params));
2323 #if defined(PNG_pHYs_SUPPORTED)
2324 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2325 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2328 #if defined(PNG_pHYs_SUPPORTED)
2329 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2330 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2333 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2334 png_infop info_ptr, png_colorp *palette, int *num_palette));
2336 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2337 png_infop info_ptr, png_colorp palette, int num_palette));
2339 #if defined(PNG_sBIT_SUPPORTED)
2340 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2341 png_infop info_ptr, png_color_8p *sig_bit));
2344 #if defined(PNG_sBIT_SUPPORTED)
2345 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2346 png_infop info_ptr, png_color_8p sig_bit));
2349 #if defined(PNG_sRGB_SUPPORTED)
2350 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2351 png_infop info_ptr, int *intent));
2354 #if defined(PNG_sRGB_SUPPORTED)
2355 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2356 png_infop info_ptr, int intent));
2357 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2358 png_infop info_ptr, int intent));
2361 #if defined(PNG_iCCP_SUPPORTED)
2362 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2363 png_infop info_ptr, png_charpp name, int *compression_type,
2364 png_charpp profile, png_uint_32 *proflen));
2365 /* Note to maintainer: profile should be png_bytepp */
2368 #if defined(PNG_iCCP_SUPPORTED)
2369 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2370 png_infop info_ptr, png_charp name, int compression_type,
2371 png_charp profile, png_uint_32 proflen));
2372 /* Note to maintainer: profile should be png_bytep */
2375 #if defined(PNG_sPLT_SUPPORTED)
2376 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2377 png_infop info_ptr, png_sPLT_tpp entries));
2380 #if defined(PNG_sPLT_SUPPORTED)
2381 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2382 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2385 #if defined(PNG_TEXT_SUPPORTED)
2386 /* png_get_text also returns the number of text chunks in *num_text */
2387 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2388 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2392 * Note while png_set_text() will accept a structure whose text,
2393 * language, and translated keywords are NULL pointers, the structure
2394 * returned by png_get_text will always contain regular
2395 * zero-terminated C strings. They might be empty strings but
2396 * they will never be NULL pointers.
2399 #if defined(PNG_TEXT_SUPPORTED)
2400 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2401 png_infop info_ptr, png_textp text_ptr, int num_text));
2404 #if defined(PNG_tIME_SUPPORTED)
2405 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2406 png_infop info_ptr, png_timep *mod_time));
2409 #if defined(PNG_tIME_SUPPORTED)
2410 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2411 png_infop info_ptr, png_timep mod_time));
2414 #if defined(PNG_tRNS_SUPPORTED)
2415 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2416 png_infop info_ptr, png_bytep *trans, int *num_trans,
2417 png_color_16p *trans_values));
2420 #if defined(PNG_tRNS_SUPPORTED)
2421 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2422 png_infop info_ptr, png_bytep trans, int num_trans,
2423 png_color_16p trans_values));
2426 #if defined(PNG_tRNS_SUPPORTED)
2429 #if defined(PNG_sCAL_SUPPORTED)
2430 #ifdef PNG_FLOATING_POINT_SUPPORTED
2431 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2432 png_infop info_ptr, int *unit, double *width, double *height));
2434 #ifdef PNG_FIXED_POINT_SUPPORTED
2435 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2436 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2439 #endif /* PNG_sCAL_SUPPORTED */
2441 #if defined(PNG_sCAL_SUPPORTED)
2442 #ifdef PNG_FLOATING_POINT_SUPPORTED
2443 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2444 png_infop info_ptr, int unit, double width, double height));
2446 #ifdef PNG_FIXED_POINT_SUPPORTED
2447 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2448 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2451 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2453 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2454 /* provide a list of chunks and how they are to be handled, if the built-in
2455 handling or default unknown chunk handling is not desired. Any chunks not
2456 listed will be handled in the default manner. The IHDR and IEND chunks
2458 keep = 0: follow default behaviour
2460 = 2: keep only if safe-to-copy
2461 = 3: keep even if unsafe-to-copy
2463 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2464 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2465 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2466 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2467 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2468 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2469 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2470 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2472 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2473 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2477 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2478 If you need to turn it off for a chunk that your application has freed,
2479 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2480 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2481 png_infop info_ptr, int mask));
2483 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2484 /* The "params" pointer is currently not used and is for future expansion. */
2485 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2489 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2495 /* Define PNG_DEBUG at compile time for debugging information. Higher
2496 * numbers for PNG_DEBUG mean more debugging information. This has
2497 * only been added since version 0.95 so it is not implemented throughout
2498 * libpng yet, but more support will be added as needed.
2502 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2505 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
2506 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2507 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2509 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2510 #ifndef PNG_DEBUG_FILE
2511 #define PNG_DEBUG_FILE stderr
2512 #endif /* PNG_DEBUG_FILE */
2514 #define png_debug(l,m) \
2517 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2518 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2520 #define png_debug1(l,m,p1) \
2523 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2524 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2526 #define png_debug2(l,m,p1,p2) \
2529 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2530 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2532 #endif /* (PNG_DEBUG > 1) */
2533 #endif /* _MSC_VER */
2534 #endif /* (PNG_DEBUG > 0) */
2535 #endif /* PNG_DEBUG */
2537 #define png_debug(l, m)
2540 #define png_debug1(l, m, p1)
2543 #define png_debug2(l, m, p1, p2)
2546 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2547 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2548 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2549 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2551 #ifdef PNG_MNG_FEATURES_SUPPORTED
2552 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2553 png_ptr, png_uint_32 mng_features_permitted));
2556 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2557 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2558 #define PNG_HANDLE_CHUNK_NEVER 1
2559 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2560 #define PNG_HANDLE_CHUNK_ALWAYS 3
2562 /* Added to version 1.2.0 */
2563 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2564 #if defined(PNG_MMX_CODE_SUPPORTED)
2565 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2566 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2567 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2568 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2569 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2570 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2571 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2572 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2573 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2575 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2576 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2577 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2578 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2579 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2580 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2581 #define PNG_MMX_WRITE_FLAGS ( 0 )
2583 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2584 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2585 | PNG_MMX_READ_FLAGS \
2586 | PNG_MMX_WRITE_FLAGS )
2588 #define PNG_SELECT_READ 1
2589 #define PNG_SELECT_WRITE 2
2590 #endif /* PNG_MMX_CODE_SUPPORTED */
2592 #if !defined(PNG_1_0_X)
2594 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2595 PNGARG((int flag_select, int *compilerID));
2598 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2599 PNGARG((int flag_select));
2602 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2603 PNGARG((png_structp png_ptr));
2606 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2607 PNGARG((png_structp png_ptr));
2610 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2611 PNGARG((png_structp png_ptr));
2614 extern PNG_EXPORT(void,png_set_asm_flags)
2615 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2618 extern PNG_EXPORT(void,png_set_mmx_thresholds)
2619 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2620 png_uint_32 mmx_rowbytes_threshold));
2622 #endif /* PNG_1_0_X */
2624 #if !defined(PNG_1_0_X)
2625 /* png.c, pnggccrd.c, or pngvcrd.c */
2626 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2627 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2629 /* Strip the prepended error numbers ("#nnn ") from error and warning
2630 * messages before passing them to the error or warning handler. */
2631 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2632 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2633 png_ptr, png_uint_32 strip_mode));
2636 #endif /* PNG_1_0_X */
2638 /* Added at libpng-1.2.6 */
2639 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2640 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2641 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2642 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2644 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2648 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2650 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2651 /* With these routines we avoid an integer divide, which will be slower on
2652 * most machines. However, it does take more operations than the corresponding
2653 * divide method, so it may be slower on a few RISC systems. There are two
2654 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2656 * Note that the rounding factors are NOT supposed to be the same! 128 and
2657 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2660 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2663 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2665 # define png_composite(composite, fg, alpha, bg) \
2666 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2667 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2668 (png_uint_16)(alpha)) + (png_uint_16)128); \
2669 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2671 # define png_composite_16(composite, fg, alpha, bg) \
2672 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2673 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2674 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2675 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2677 #else /* standard method using integer division */
2679 # define png_composite(composite, fg, alpha, bg) \
2680 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2681 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2682 (png_uint_16)127) / 255)
2684 # define png_composite_16(composite, fg, alpha, bg) \
2685 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2686 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2687 (png_uint_32)32767) / (png_uint_32)65535L)
2689 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2691 /* Inline macros to do direct reads of bytes from the input buffer. These
2692 * require that you are using an architecture that uses PNG byte ordering
2693 * (MSB first) and supports unaligned data storage. I think that PowerPC
2694 * in big-endian mode and 680x0 are the only ones that will support this.
2695 * The x86 line of processors definitely do not. The png_get_int_32()
2696 * routine also assumes we are using two's complement format for negative
2697 * values, which is almost certainly true.
2699 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2700 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2701 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2702 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2704 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2705 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2706 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2707 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2708 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2709 PNGARG((png_structp png_ptr, png_bytep buf));
2710 /* No png_get_int_16 -- may be added if there's a real need for it. */
2712 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2714 extern PNG_EXPORT(void,png_save_uint_32)
2715 PNGARG((png_bytep buf, png_uint_32 i));
2716 extern PNG_EXPORT(void,png_save_int_32)
2717 PNGARG((png_bytep buf, png_int_32 i));
2719 /* Place a 16-bit number into a buffer in PNG byte order.
2720 * The parameter is declared unsigned int, not png_uint_16,
2721 * just to avoid potential problems on pre-ANSI C compilers.
2723 extern PNG_EXPORT(void,png_save_uint_16)
2724 PNGARG((png_bytep buf, unsigned int i));
2725 /* No png_save_int_16 -- may be added if there's a real need for it. */
2727 /* ************************************************************************* */
2729 /* These next functions are used internally in the code. They generally
2730 * shouldn't be used unless you are writing code to add or replace some
2731 * functionality in libpng. More information about most functions can
2732 * be found in the files where the functions are located.
2736 /* Various modes of operation, that are visible to applications because
2737 * they are used for unknown chunk location.
2739 #define PNG_HAVE_IHDR 0x01
2740 #define PNG_HAVE_PLTE 0x02
2741 #define PNG_HAVE_IDAT 0x04
2742 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2743 #define PNG_HAVE_IEND 0x10
2745 #if defined(PNG_INTERNAL)
2747 /* More modes of operation. Note that after an init, mode is set to
2748 * zero automatically when the structure is created.
2750 #define PNG_HAVE_gAMA 0x20
2751 #define PNG_HAVE_cHRM 0x40
2752 #define PNG_HAVE_sRGB 0x80
2753 #define PNG_HAVE_CHUNK_HEADER 0x100
2754 #define PNG_WROTE_tIME 0x200
2755 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2756 #define PNG_BACKGROUND_IS_GRAY 0x800
2757 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2758 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2760 /* flags for the transformations the PNG library does on the image data */
2761 #define PNG_BGR 0x0001
2762 #define PNG_INTERLACE 0x0002
2763 #define PNG_PACK 0x0004
2764 #define PNG_SHIFT 0x0008
2765 #define PNG_SWAP_BYTES 0x0010
2766 #define PNG_INVERT_MONO 0x0020
2767 #define PNG_DITHER 0x0040
2768 #define PNG_BACKGROUND 0x0080
2769 #define PNG_BACKGROUND_EXPAND 0x0100
2771 #define PNG_16_TO_8 0x0400
2772 #define PNG_RGBA 0x0800
2773 #define PNG_EXPAND 0x1000
2774 #define PNG_GAMMA 0x2000
2775 #define PNG_GRAY_TO_RGB 0x4000
2776 #define PNG_FILLER 0x8000L
2777 #define PNG_PACKSWAP 0x10000L
2778 #define PNG_SWAP_ALPHA 0x20000L
2779 #define PNG_STRIP_ALPHA 0x40000L
2780 #define PNG_INVERT_ALPHA 0x80000L
2781 #define PNG_USER_TRANSFORM 0x100000L
2782 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2783 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2784 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2785 /* 0x800000L Unused */
2786 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2787 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2788 /* 0x4000000L unused */
2789 /* 0x8000000L unused */
2790 /* 0x10000000L unused */
2791 /* 0x20000000L unused */
2792 /* 0x40000000L unused */
2794 /* flags for png_create_struct */
2795 #define PNG_STRUCT_PNG 0x0001
2796 #define PNG_STRUCT_INFO 0x0002
2798 /* Scaling factor for filter heuristic weighting calculations */
2799 #define PNG_WEIGHT_SHIFT 8
2800 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2801 #define PNG_COST_SHIFT 3
2802 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2804 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2805 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2806 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2807 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2808 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2809 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2810 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2811 #define PNG_FLAG_ROW_INIT 0x0040
2812 #define PNG_FLAG_FILLER_AFTER 0x0080
2813 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2814 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2815 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2816 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2817 #define PNG_FLAG_FREE_PLTE 0x1000
2818 #define PNG_FLAG_FREE_TRNS 0x2000
2819 #define PNG_FLAG_FREE_HIST 0x4000
2820 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2821 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2822 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2823 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2824 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2825 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2826 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2827 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2828 /* 0x800000L unused */
2829 /* 0x1000000L unused */
2830 /* 0x2000000L unused */
2831 /* 0x4000000L unused */
2832 /* 0x8000000L unused */
2833 /* 0x10000000L unused */
2834 /* 0x20000000L unused */
2835 /* 0x40000000L unused */
2837 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2838 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2840 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2841 PNG_FLAG_CRC_CRITICAL_IGNORE)
2843 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2844 PNG_FLAG_CRC_CRITICAL_MASK)
2846 /* save typing and make code easier to understand */
2848 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2849 abs((int)((c1).green) - (int)((c2).green)) + \
2850 abs((int)((c1).blue) - (int)((c2).blue)))
2852 /* Added to libpng-1.2.6 JB */
2853 #define PNG_ROWBYTES(pixel_bits, width) \
2854 ((pixel_bits) >= 8 ? \
2855 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2856 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2858 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2859 ideal-delta..ideal+delta. Each argument is evaluated twice.
2860 "ideal" and "delta" should be constants, normally simple
2861 integers, "value" a variable. Added to libpng-1.2.6 JB */
2862 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2863 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2865 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2866 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2867 /* place to hold the signature string for a PNG file. */
2868 #ifdef PNG_USE_GLOBAL_ARRAYS
2869 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
2872 #endif /* PNG_NO_EXTERN */
2874 /* Constant strings for known chunk types. If you need to add a chunk,
2875 * define the name here, and add an invocation of the macro in png.c and
2876 * wherever it's needed.
2878 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2879 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2880 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2881 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2882 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2883 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2884 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2885 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2886 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2887 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2888 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2889 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2890 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2891 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2892 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2893 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2894 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2895 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2896 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2897 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2898 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2900 #ifdef PNG_USE_GLOBAL_ARRAYS
2901 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
2902 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
2903 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
2904 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
2905 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
2906 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
2907 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
2908 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
2909 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
2910 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
2911 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
2912 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
2913 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
2914 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
2915 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
2916 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
2917 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
2918 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
2919 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
2920 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
2921 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
2922 #endif /* PNG_USE_GLOBAL_ARRAYS */
2924 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2925 /* Initialize png_ptr struct for reading, and allocate any other memory.
2926 * (old interface - DEPRECATED - use png_create_read_struct instead).
2928 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
2929 #undef png_read_init
2930 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2931 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2934 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2935 png_const_charp user_png_ver, png_size_t png_struct_size));
2936 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2937 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2938 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2942 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2943 /* Initialize png_ptr struct for writing, and allocate any other memory.
2944 * (old interface - DEPRECATED - use png_create_write_struct instead).
2946 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
2947 #undef png_write_init
2948 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2949 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2952 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2953 png_const_charp user_png_ver, png_size_t png_struct_size));
2954 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2955 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2958 /* Allocate memory for an internal libpng struct */
2959 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
2961 /* Free memory from internal libpng struct */
2962 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
2964 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2965 malloc_fn, png_voidp mem_ptr));
2966 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2967 png_free_ptr free_fn, png_voidp mem_ptr));
2969 /* Free any memory that info_ptr points to and reset struct. */
2970 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2971 png_infop info_ptr));
2974 /* Function to allocate memory for zlib. */
2975 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
2977 /* Function to free memory for zlib */
2978 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
2981 /* Function to convert a sizeof an item to png_sizeof item */
2982 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
2985 /* Next four functions are used internally as callbacks. PNGAPI is required
2986 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2988 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
2989 png_bytep data, png_size_t length));
2991 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2992 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
2993 png_bytep buffer, png_size_t length));
2996 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
2997 png_bytep data, png_size_t length));
2999 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3000 #if !defined(PNG_NO_STDIO)
3001 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
3004 #else /* PNG_1_0_X */
3005 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3006 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
3007 png_bytep buffer, png_size_t length));
3009 #endif /* PNG_1_0_X */
3011 /* Reset the CRC variable */
3012 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
3014 /* Write the "data" buffer to whatever output you are using. */
3015 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
3016 png_size_t length));
3018 /* Read data from whatever input you are using into the "data" buffer */
3019 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
3020 png_size_t length));
3022 /* Read bytes into buf, and update png_ptr->crc */
3023 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
3024 png_size_t length));
3026 /* Decompress data in a chunk that uses compression */
3027 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3028 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3029 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
3030 int comp_type, png_charp chunkdata, png_size_t chunklength,
3031 png_size_t prefix_length, png_size_t *data_length));
3034 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3035 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
3037 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3038 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
3040 /* Calculate the CRC over a section of data. Note that we are only
3041 * passing a maximum of 64K on systems that have this as a memory limit,
3042 * since this is the maximum buffer size we can specify.
3044 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3045 png_size_t length));
3047 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3048 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
3051 /* simple function to write the signature */
3052 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
3054 /* write various chunks */
3056 /* Write the IHDR chunk, and update the png_struct with the necessary
3059 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3061 int bit_depth, int color_type, int compression_method, int filter_method,
3062 int interlace_method));
3064 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3065 png_uint_32 num_pal));
3067 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3068 png_size_t length));
3070 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
3072 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3073 #ifdef PNG_FLOATING_POINT_SUPPORTED
3074 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
3076 #ifdef PNG_FIXED_POINT_SUPPORTED
3077 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
3082 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3083 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3087 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3088 #ifdef PNG_FLOATING_POINT_SUPPORTED
3089 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3090 double white_x, double white_y,
3091 double red_x, double red_y, double green_x, double green_y,
3092 double blue_x, double blue_y));
3094 #ifdef PNG_FIXED_POINT_SUPPORTED
3095 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3096 png_fixed_point int_white_x, png_fixed_point int_white_y,
3097 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3098 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3099 png_fixed_point int_blue_y));
3103 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3104 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3108 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3109 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3110 png_charp name, int compression_type,
3111 png_charp profile, int proflen));
3112 /* Note to maintainer: profile should be png_bytep */
3115 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3116 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3117 png_sPLT_tp palette));
3120 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3121 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3122 png_color_16p values, int number, int color_type));
3125 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3126 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3127 png_color_16p values, int color_type));
3130 #if defined(PNG_WRITE_hIST_SUPPORTED)
3131 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3135 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3136 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3137 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3138 png_charp key, png_charpp new_key));
3141 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3142 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3143 png_charp text, png_size_t text_len));
3146 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3147 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3148 png_charp text, png_size_t text_len, int compression));
3151 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3152 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3153 int compression, png_charp key, png_charp lang, png_charp lang_key,
3157 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3158 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3159 png_infop info_ptr, png_textp text_ptr, int num_text));
3162 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3163 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3164 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3167 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3168 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3169 png_int_32 X0, png_int_32 X1, int type, int nparams,
3170 png_charp units, png_charpp params));
3173 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3174 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3175 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3179 #if defined(PNG_WRITE_tIME_SUPPORTED)
3180 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3181 png_timep mod_time));
3184 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3185 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3186 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3187 int unit, double width, double height));
3189 #ifdef PNG_FIXED_POINT_SUPPORTED
3190 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3191 int unit, png_charp width, png_charp height));
3196 /* Called when finished processing a row of data */
3197 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3199 /* Internal use only. Called before first row of data */
3200 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3202 #if defined(PNG_READ_GAMMA_SUPPORTED)
3203 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3206 /* combine a row of data, dealing with alpha, etc. if requested */
3207 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3210 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3211 /* expand an interlaced row */
3212 /* OLD pre-1.0.9 interface:
3213 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3214 png_bytep row, int pass, png_uint_32 transformations));
3216 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3219 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3221 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3222 /* grab pixels out of a row for an interlaced pass */
3223 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3224 png_bytep row, int pass));
3227 /* unfilter a row */
3228 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3229 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3231 /* Choose the best filter to use and filter the row data */
3232 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3233 png_row_infop row_info));
3235 /* Write out the filtered row. */
3236 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3237 png_bytep filtered_row));
3238 /* finish a row while reading, dealing with interlacing passes, etc. */
3239 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3241 /* initialize the row buffers, etc. */
3242 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3243 /* optional call to update the users info structure */
3244 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3245 png_infop info_ptr));
3247 /* these are the functions that do the transformations */
3248 #if defined(PNG_READ_FILLER_SUPPORTED)
3249 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3250 png_bytep row, png_uint_32 filler, png_uint_32 flags));
3253 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3254 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3258 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3259 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3263 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3264 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3268 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3269 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3273 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3274 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3275 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3276 png_bytep row, png_uint_32 flags));
3279 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3280 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3283 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3284 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3287 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3288 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3289 row_info, png_bytep row));
3292 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3293 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3297 #if defined(PNG_READ_PACK_SUPPORTED)
3298 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3301 #if defined(PNG_READ_SHIFT_SUPPORTED)
3302 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3303 png_color_8p sig_bits));
3306 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3307 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3310 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3311 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3314 #if defined(PNG_READ_DITHER_SUPPORTED)
3315 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3316 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3318 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3319 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3320 png_colorp palette, int num_palette));
3324 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3325 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3328 #if defined(PNG_WRITE_PACK_SUPPORTED)
3329 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3330 png_bytep row, png_uint_32 bit_depth));
3333 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3334 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3335 png_color_8p bit_depth));
3338 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3339 #if defined(PNG_READ_GAMMA_SUPPORTED)
3340 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3341 png_color_16p trans_values, png_color_16p background,
3342 png_color_16p background_1,
3343 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3344 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3345 png_uint_16pp gamma_16_to_1, int gamma_shift));
3347 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3348 png_color_16p trans_values, png_color_16p background));
3352 #if defined(PNG_READ_GAMMA_SUPPORTED)
3353 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3354 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3358 #if defined(PNG_READ_EXPAND_SUPPORTED)
3359 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3360 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3361 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3362 png_bytep row, png_color_16p trans_value));
3365 /* The following decodes the appropriate chunks, and does error correction,
3366 * then calls the appropriate callback for the chunk if it is valid.
3369 /* decode the IHDR chunk */
3370 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3371 png_uint_32 length));
3372 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3373 png_uint_32 length));
3374 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3375 png_uint_32 length));
3377 #if defined(PNG_READ_bKGD_SUPPORTED)
3378 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3379 png_uint_32 length));
3382 #if defined(PNG_READ_cHRM_SUPPORTED)
3383 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3384 png_uint_32 length));
3387 #if defined(PNG_READ_gAMA_SUPPORTED)
3388 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3389 png_uint_32 length));
3392 #if defined(PNG_READ_hIST_SUPPORTED)
3393 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3394 png_uint_32 length));
3397 #if defined(PNG_READ_iCCP_SUPPORTED)
3398 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3399 png_uint_32 length));
3400 #endif /* PNG_READ_iCCP_SUPPORTED */
3402 #if defined(PNG_READ_iTXt_SUPPORTED)
3403 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3404 png_uint_32 length));
3407 #if defined(PNG_READ_oFFs_SUPPORTED)
3408 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3409 png_uint_32 length));
3412 #if defined(PNG_READ_pCAL_SUPPORTED)
3413 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3414 png_uint_32 length));
3417 #if defined(PNG_READ_pHYs_SUPPORTED)
3418 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3419 png_uint_32 length));
3422 #if defined(PNG_READ_sBIT_SUPPORTED)
3423 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3424 png_uint_32 length));
3427 #if defined(PNG_READ_sCAL_SUPPORTED)
3428 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3429 png_uint_32 length));
3432 #if defined(PNG_READ_sPLT_SUPPORTED)
3433 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3434 png_uint_32 length));
3435 #endif /* PNG_READ_sPLT_SUPPORTED */
3437 #if defined(PNG_READ_sRGB_SUPPORTED)
3438 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3439 png_uint_32 length));
3442 #if defined(PNG_READ_tEXt_SUPPORTED)
3443 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3444 png_uint_32 length));
3447 #if defined(PNG_READ_tIME_SUPPORTED)
3448 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3449 png_uint_32 length));
3452 #if defined(PNG_READ_tRNS_SUPPORTED)
3453 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3454 png_uint_32 length));
3457 #if defined(PNG_READ_zTXt_SUPPORTED)
3458 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3459 png_uint_32 length));
3462 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3463 png_infop info_ptr, png_uint_32 length));
3465 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3466 png_bytep chunk_name));
3468 /* handle the transformations for reading and writing */
3469 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3470 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3472 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3474 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3475 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3476 png_infop info_ptr));
3477 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3478 png_infop info_ptr));
3479 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3480 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3481 png_uint_32 length));
3482 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3483 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3484 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3485 png_bytep buffer, png_size_t buffer_length));
3486 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3487 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3488 png_bytep buffer, png_size_t buffer_length));
3489 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3490 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3491 png_infop info_ptr, png_uint_32 length));
3492 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3493 png_infop info_ptr));
3494 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3495 png_infop info_ptr));
3496 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3497 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3498 png_infop info_ptr));
3499 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3500 png_infop info_ptr));
3501 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3502 #if defined(PNG_READ_tEXt_SUPPORTED)
3503 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3504 png_infop info_ptr, png_uint_32 length));
3505 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3506 png_infop info_ptr));
3508 #if defined(PNG_READ_zTXt_SUPPORTED)
3509 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3510 png_infop info_ptr, png_uint_32 length));
3511 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3512 png_infop info_ptr));
3514 #if defined(PNG_READ_iTXt_SUPPORTED)
3515 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3516 png_infop info_ptr, png_uint_32 length));
3517 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3518 png_infop info_ptr));
3521 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3523 #ifdef PNG_MNG_FEATURES_SUPPORTED
3524 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3526 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3530 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3531 #if defined(PNG_MMX_CODE_SUPPORTED)
3532 /* png.c */ /* PRIVATE */
3533 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3537 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3538 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3539 png_infop info_ptr));
3541 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3542 png_infop info_ptr));
3544 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3545 png_infop info_ptr));
3547 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3548 png_infop info_ptr));
3550 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3551 png_infop info_ptr));
3553 #if defined(PNG_pHYs_SUPPORTED)
3554 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3555 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3556 #endif /* PNG_pHYs_SUPPORTED */
3557 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3559 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3561 #endif /* PNG_INTERNAL */
3567 #endif /* PNG_VERSION_INFO_ONLY */
3568 /* do not put anything past this line */
projects / opencv / blob