2 /* png.h - header file for PNG reference library
4 * libpng version 1.2.24 - December 14, 2007
5 * Copyright (c) 1998-2007 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 * Authors and maintainers:
10 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
11 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
12 * libpng versions 0.97, January 1998, through 1.2.24 - December 14, 2007: Glenn
13 * See also "Contributing Authors", below.
15 * Note about libpng version numbers:
17 * Due to various miscommunications, unforeseen code incompatibilities
18 * and occasional factors outside the authors' control, version numbering
19 * on the library has not always been consistent and straightforward.
20 * The following table summarizes matters since version 0.89c, which was
21 * the first widely used release:
23 * source png.h png.h shared-lib
24 * version string int version
25 * ------- ------ ----- ----------
26 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
27 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
28 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
29 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
30 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
31 * 0.97c 0.97 97 2.0.97
34 * 0.99a-m 0.99 99 2.0.99
35 * 1.00 1.00 100 2.1.0 [100 should be 10000]
36 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
37 * 1.0.1 png.h string is 10001 2.1.0
38 * 1.0.1a-e identical to the 10002 from here on, the shared library
39 * 1.0.2 source version) 10002 is 2.V where V is the source code
40 * 1.0.2a-b 10003 version, except as noted.
45 * 1.0.5 (+ 2 patches) 10005
47 * 1.0.5e-r 10100 (not source compatible)
48 * 1.0.5s-v 10006 (not binary compatible)
49 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
50 * 1.0.6d-f 10007 (still binary incompatible)
52 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
54 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
55 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
56 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
57 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
58 * 1.0.7 1 10007 (still compatible)
59 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
60 * 1.0.8rc1 1 10008 2.1.0.8rc1
61 * 1.0.8 1 10008 2.1.0.8
62 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
63 * 1.0.9rc1 1 10009 2.1.0.9rc1
64 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
65 * 1.0.9rc2 1 10009 2.1.0.9rc2
66 * 1.0.9 1 10009 2.1.0.9
67 * 1.0.10beta1 1 10010 2.1.0.10beta1
68 * 1.0.10rc1 1 10010 2.1.0.10rc1
69 * 1.0.10 1 10010 2.1.0.10
70 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
71 * 1.0.11rc1 1 10011 2.1.0.11rc1
72 * 1.0.11 1 10011 2.1.0.11
73 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
74 * 1.0.12rc1 2 10012 2.1.0.12rc1
75 * 1.0.12 2 10012 2.1.0.12
76 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
77 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
78 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
79 * 1.2.0rc1 3 10200 3.1.2.0rc1
80 * 1.2.0 3 10200 3.1.2.0
81 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
82 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
83 * 1.2.1 3 10201 3.1.2.1
84 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
85 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
86 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
87 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
88 * 1.0.13 10 10013 10.so.0.1.0.13
89 * 1.2.2 12 10202 12.so.0.1.2.2
90 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
91 * 1.2.3 12 10203 12.so.0.1.2.3
92 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
93 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
94 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
95 * 1.0.14 10 10014 10.so.0.1.0.14
96 * 1.2.4 13 10204 12.so.0.1.2.4
97 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
98 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
99 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
100 * 1.0.15 10 10015 10.so.0.1.0.15
101 * 1.2.5 13 10205 12.so.0.1.2.5
102 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
103 * 1.0.16 10 10016 10.so.0.1.0.16
104 * 1.2.6 13 10206 12.so.0.1.2.6
105 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
106 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
107 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
108 * 1.0.17 10 10017 10.so.0.1.0.17
109 * 1.2.7 13 10207 12.so.0.1.2.7
110 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
111 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
112 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
113 * 1.0.18 10 10018 10.so.0.1.0.18
114 * 1.2.8 13 10208 12.so.0.1.2.8
115 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
116 * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
117 * 1.2.9rc1 13 10209 12.so.0.9[.0]
118 * 1.2.9 13 10209 12.so.0.9[.0]
119 * 1.2.10beta1-8 13 10210 12.so.0.10[.0]
120 * 1.2.10rc1-3 13 10210 12.so.0.10[.0]
121 * 1.2.10 13 10210 12.so.0.10[.0]
122 * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
123 * 1.0.19rc1-5 10 10019 10.so.0.19[.0]
124 * 1.2.11rc1-5 13 10211 12.so.0.11[.0]
125 * 1.0.19 10 10019 10.so.0.19[.0]
126 * 1.2.11 13 10211 12.so.0.11[.0]
127 * 1.0.20 10 10020 10.so.0.20[.0]
128 * 1.2.12 13 10212 12.so.0.12[.0]
129 * 1.2.13beta1 13 10213 12.so.0.13[.0]
130 * 1.0.21 10 10021 10.so.0.21[.0]
131 * 1.2.13 13 10213 12.so.0.13[.0]
132 * 1.2.14beta1-2 13 10214 12.so.0.14[.0]
133 * 1.0.22rc1 10 10022 10.so.0.22[.0]
134 * 1.2.14rc1 13 10214 12.so.0.14[.0]
135 * 1.0.22 10 10022 10.so.0.22[.0]
136 * 1.2.14 13 10214 12.so.0.14[.0]
137 * 1.2.15beta1-6 13 10215 12.so.0.15[.0]
138 * 1.0.23rc1-5 10 10023 10.so.0.23[.0]
139 * 1.2.15rc1-5 13 10215 12.so.0.15[.0]
140 * 1.0.23 10 10023 10.so.0.23[.0]
141 * 1.2.15 13 10215 12.so.0.15[.0]
142 * 1.2.16beta1-2 13 10216 12.so.0.16[.0]
143 * 1.2.16rc1 13 10216 12.so.0.16[.0]
144 * 1.0.24 10 10024 10.so.0.24[.0]
145 * 1.2.16 13 10216 12.so.0.16[.0]
146 * 1.2.17beta1-2 13 10217 12.so.0.17[.0]
147 * 1.0.25rc1 10 10025 10.so.0.25[.0]
148 * 1.2.17rc1-3 13 10217 12.so.0.17[.0]
149 * 1.0.25 10 10025 10.so.0.25[.0]
150 * 1.2.17 13 10217 12.so.0.17[.0]
151 * 1.0.26 10 10026 10.so.0.26[.0]
152 * 1.2.18 13 10218 12.so.0.18[.0]
153 * 1.2.19beta1-31 13 10219 12.so.0.19[.0]
154 * 1.0.27rc1-6 10 10027 10.so.0.27[.0]
155 * 1.2.19rc1-6 13 10219 12.so.0.19[.0]
156 * 1.0.27 10 10027 10.so.0.27[.0]
157 * 1.2.19 13 10219 12.so.0.19[.0]
158 * 1.2.20beta01-04 13 10220 12.so.0.20[.0]
159 * 1.0.28rc1-6 10 10028 10.so.0.28[.0]
160 * 1.2.20rc1-6 13 10220 12.so.0.20[.0]
161 * 1.0.28 10 10028 10.so.0.28[.0]
162 * 1.2.20 13 10220 12.so.0.20[.0]
163 * 1.2.21beta1-2 13 10221 12.so.0.21[.0]
164 * 1.2.21rc1-3 13 10221 12.so.0.21[.0]
165 * 1.0.29 10 10029 10.so.0.29[.0]
166 * 1.2.21 13 10221 12.so.0.21[.0]
167 * 1.2.22beta1-4 13 10222 12.so.0.22[.0]
168 * 1.0.30rc1 10 10030 10.so.0.30[.0]
169 * 1.2.22rc1 13 10222 12.so.0.22[.0]
170 * 1.0.30 10 10030 10.so.0.30[.0]
171 * 1.2.22 13 10222 12.so.0.22[.0]
172 * 1.2.23beta01-05 13 10223 12.so.0.23[.0]
173 * 1.2.23rc01 13 10223 12.so.0.23[.0]
174 * 1.2.23 13 10223 12.so.0.23[.0]
175 * 1.2.24beta01-02 13 10224 12.so.0.24[.0]
176 * 1.2.24rc01 13 10224 12.so.0.24[.0]
177 * 1.2.24 13 10224 12.so.0.24[.0]
179 * Henceforth the source version will match the shared-library major
180 * and minor numbers; the shared-library major version number will be
181 * used for changes in backward compatibility, as it is intended. The
182 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
183 * for applications, is an unsigned integer of the form xyyzz corresponding
184 * to the source version x.y.z (leading zeros in y and z). Beta versions
185 * were given the previous public release number plus a letter, until
186 * version 1.0.6j; from then on they were given the upcoming public
187 * release number plus "betaNN" or "rcN".
189 * Binary incompatibility exists only when applications make direct access
190 * to the info_ptr or png_ptr members through png.h, and the compiled
191 * application is loaded with a different version of the library.
193 * DLLNUM will change each time there are forward or backward changes
194 * in binary compatibility (e.g., when a new feature is added).
196 * See libpng.txt or libpng.3 for more information. The PNG specification
197 * is available as a W3C Recommendation and as an ISO Specification,
198 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
202 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
204 * If you modify libpng you may insert additional notices immediately following
207 * libpng versions 1.2.6, August 15, 2004, through 1.2.24, December 14, 2007, are
208 * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
209 * distributed according to the same disclaimer and license as libpng-1.2.5
210 * with the following individual added to the list of Contributing Authors:
214 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
215 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
216 * distributed according to the same disclaimer and license as libpng-1.0.6
217 * with the following individuals added to the list of Contributing Authors:
219 * Simon-Pierre Cadieux
223 * and with the following additions to the disclaimer:
225 * There is no warranty against interference with your enjoyment of the
226 * library or against infringement. There is no warranty that our
227 * efforts or the library will fulfill any of your particular purposes
228 * or needs. This library is provided with all faults, and the entire
229 * risk of satisfactory quality, performance, accuracy, and effort is with
232 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
233 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
234 * distributed according to the same disclaimer and license as libpng-0.96,
235 * with the following individuals added to the list of Contributing Authors:
238 * Glenn Randers-Pehrson
241 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
242 * Copyright (c) 1996, 1997 Andreas Dilger
243 * Distributed according to the same disclaimer and license as libpng-0.88,
244 * with the following individuals added to the list of Contributing Authors:
253 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
254 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
256 * For the purposes of this copyright and license, "Contributing Authors"
257 * is defined as the following set of individuals:
265 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
266 * and Group 42, Inc. disclaim all warranties, expressed or implied,
267 * including, without limitation, the warranties of merchantability and of
268 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
269 * assume no liability for direct, indirect, incidental, special, exemplary,
270 * or consequential damages, which may result from the use of the PNG
271 * Reference Library, even if advised of the possibility of such damage.
273 * Permission is hereby granted to use, copy, modify, and distribute this
274 * source code, or portions hereof, for any purpose, without fee, subject
275 * to the following restrictions:
277 * 1. The origin of this source code must not be misrepresented.
279 * 2. Altered versions must be plainly marked as such and
280 * must not be misrepresented as being the original source.
282 * 3. This Copyright notice may not be removed or altered from
283 * any source or altered source distribution.
285 * The Contributing Authors and Group 42, Inc. specifically permit, without
286 * fee, and encourage the use of this source code as a component to
287 * supporting the PNG file format in commercial products. If you use this
288 * source code in a product, acknowledgment is not required but would be
293 * A "png_get_copyright" function is available, for convenient use in "about"
294 * boxes and the like:
296 * printf("%s",png_get_copyright(NULL));
298 * Also, the PNG logo (in PNG format, of course) is supplied in the
299 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
303 * Libpng is OSI Certified Open Source Software. OSI Certified is a
304 * certification mark of the Open Source Initiative.
308 * The contributing authors would like to thank all those who helped
309 * with testing, bug fixes, and patience. This wouldn't have been
310 * possible without all of you.
312 * Thanks to Frank J. T. Wojcik for helping with the documentation.
316 * Y2K compliance in libpng:
317 * =========================
321 * Since the PNG Development group is an ad-hoc body, we can't make
322 * an official declaration.
324 * This is your unofficial assurance that libpng from version 0.71 and
325 * upward through 1.2.24 are Y2K compliant. It is my belief that earlier
326 * versions were also Y2K compliant.
328 * Libpng only has three year fields. One is a 2-byte unsigned integer
329 * that will hold years up to 65535. The other two hold the date in text
330 * format, and will hold years up to 9999.
333 * "png_uint_16 year" in png_time_struct.
336 * "png_charp time_buffer" in png_struct and
337 * "near_time_buffer", which is a local character string in png.c.
339 * There are seven time-related functions:
340 * png.c: png_convert_to_rfc_1123() in png.c
341 * (formerly png_convert_to_rfc_1152() in error)
342 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
343 * png_convert_from_time_t() in pngwrite.c
344 * png_get_tIME() in pngget.c
345 * png_handle_tIME() in pngrutil.c, called in pngread.c
346 * png_set_tIME() in pngset.c
347 * png_write_tIME() in pngwutil.c, called in pngwrite.c
349 * All handle dates properly in a Y2K environment. The
350 * png_convert_from_time_t() function calls gmtime() to convert from system
351 * clock time, which returns (year - 1900), which we properly convert to
352 * the full 4-digit year. There is a possibility that applications using
353 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
354 * function, or that they are incorrectly passing only a 2-digit year
355 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
356 * but this is not under our control. The libpng documentation has always
357 * stated that it works with 4-digit years, and the APIs have been
358 * documented as such.
360 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
361 * integer to hold the year, and can hold years as large as 65535.
363 * zlib, upon which libpng depends, is also Y2K compliant. It contains
364 * no date-related code.
366 * Glenn Randers-Pehrson
368 * PNG Development Group
374 /* This is not the place to learn how to use libpng. The file libpng.txt
375 * describes how to use libpng, and the file example.c summarizes it
376 * with some code on which to build. This file is useful for looking
377 * at the actual function definitions and structure components.
380 /* Version information for png.h - this should match the version in png.c */
381 #define PNG_LIBPNG_VER_STRING "1.2.24"
382 #define PNG_HEADER_VERSION_STRING \
383 " libpng version 1.2.24 - December 14, 2007\n"
385 #define PNG_LIBPNG_VER_SONUM 0
386 #define PNG_LIBPNG_VER_DLLNUM 13
388 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
389 #define PNG_LIBPNG_VER_MAJOR 1
390 #define PNG_LIBPNG_VER_MINOR 2
391 #define PNG_LIBPNG_VER_RELEASE 24
392 /* This should match the numeric part of the final component of
393 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
395 #define PNG_LIBPNG_VER_BUILD 0
398 #define PNG_LIBPNG_BUILD_ALPHA 1
399 #define PNG_LIBPNG_BUILD_BETA 2
400 #define PNG_LIBPNG_BUILD_RC 3
401 #define PNG_LIBPNG_BUILD_STABLE 4
402 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
404 /* Release-Specific Flags */
405 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
406 PNG_LIBPNG_BUILD_STABLE only */
407 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
408 PNG_LIBPNG_BUILD_SPECIAL */
409 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
410 PNG_LIBPNG_BUILD_PRIVATE */
412 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
414 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
415 * We must not include leading zeros.
416 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
417 * version 1.0.0 was mis-numbered 100 instead of 10000). From
418 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
419 #define PNG_LIBPNG_VER 10224 /* 1.2.24 */
421 #ifndef PNG_VERSION_INFO_ONLY
422 /* include the compression library's header */
426 /* include all user configurable info, including optional assembler routines */
430 * Added at libpng-1.2.8 */
431 /* Ref MSDN: Private as priority over Special
432 * VS_FF_PRIVATEBUILD File *was not* built using standard release
433 * procedures. If this value is given, the StringFileInfo block must
434 * contain a PrivateBuild string.
436 * VS_FF_SPECIALBUILD File *was* built by the original company using
437 * standard release procedures but is a variation of the standard
438 * file of the same version number. If this value is given, the
439 * StringFileInfo block must contain a SpecialBuild string.
442 #if defined(PNG_USER_PRIVATEBUILD)
443 # define PNG_LIBPNG_BUILD_TYPE \
444 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
446 # if defined(PNG_LIBPNG_SPECIALBUILD)
447 # define PNG_LIBPNG_BUILD_TYPE \
448 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
450 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
454 #ifndef PNG_VERSION_INFO_ONLY
456 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
459 #endif /* __cplusplus */
461 /* This file is arranged in several sections. The first section contains
462 * structure and type definitions. The second section contains the external
463 * library functions, while the third has the internal library functions,
464 * which applications aren't expected to use directly.
467 #ifndef PNG_NO_TYPECAST_NULL
468 #define int_p_NULL (int *)NULL
469 #define png_bytep_NULL (png_bytep)NULL
470 #define png_bytepp_NULL (png_bytepp)NULL
471 #define png_doublep_NULL (png_doublep)NULL
472 #define png_error_ptr_NULL (png_error_ptr)NULL
473 #define png_flush_ptr_NULL (png_flush_ptr)NULL
474 #define png_free_ptr_NULL (png_free_ptr)NULL
475 #define png_infopp_NULL (png_infopp)NULL
476 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
477 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
478 #define png_rw_ptr_NULL (png_rw_ptr)NULL
479 #define png_structp_NULL (png_structp)NULL
480 #define png_uint_16p_NULL (png_uint_16p)NULL
481 #define png_voidp_NULL (png_voidp)NULL
482 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
484 #define int_p_NULL NULL
485 #define png_bytep_NULL NULL
486 #define png_bytepp_NULL NULL
487 #define png_doublep_NULL NULL
488 #define png_error_ptr_NULL NULL
489 #define png_flush_ptr_NULL NULL
490 #define png_free_ptr_NULL NULL
491 #define png_infopp_NULL NULL
492 #define png_malloc_ptr_NULL NULL
493 #define png_read_status_ptr_NULL NULL
494 #define png_rw_ptr_NULL NULL
495 #define png_structp_NULL NULL
496 #define png_uint_16p_NULL NULL
497 #define png_voidp_NULL NULL
498 #define png_write_status_ptr_NULL NULL
501 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
502 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
503 /* Version information for C files, stored in png.c. This had better match
506 #ifdef PNG_USE_GLOBAL_ARRAYS
507 PNG_EXPORT_VAR (PNG_CONST
char) png_libpng_ver
[18];
508 /* need room for 99.99.99beta99z */
510 #define png_libpng_ver png_get_header_ver(NULL)
513 #ifdef PNG_USE_GLOBAL_ARRAYS
514 /* This was removed in version 1.0.5c */
515 /* Structures to facilitate easy interlacing. See png.c for more details */
516 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_start
[7];
517 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_inc
[7];
518 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_ystart
[7];
519 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_yinc
[7];
520 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_mask
[7];
521 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_dsp_mask
[7];
522 /* This isn't currently used. If you need it, see png.c for more details.
523 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
527 #endif /* PNG_NO_EXTERN */
529 /* Three color definitions. The order of the red, green, and blue, (and the
530 * exact size) is not important, although the size of the fields need to
531 * be png_byte or png_uint_16 (as defined below).
533 typedef struct png_color_struct
539 typedef png_color FAR
* png_colorp
;
540 typedef png_color FAR
* FAR
* png_colorpp
;
542 typedef struct png_color_16_struct
544 png_byte index
; /* used for palette files */
545 png_uint_16 red
; /* for use in red green blue files */
548 png_uint_16 gray
; /* for use in grayscale files */
550 typedef png_color_16 FAR
* png_color_16p
;
551 typedef png_color_16 FAR
* FAR
* png_color_16pp
;
553 typedef struct png_color_8_struct
555 png_byte red
; /* for use in red green blue files */
558 png_byte gray
; /* for use in grayscale files */
559 png_byte alpha
; /* for alpha channel files */
561 typedef png_color_8 FAR
* png_color_8p
;
562 typedef png_color_8 FAR
* FAR
* png_color_8pp
;
565 * The following two structures are used for the in-core representation
568 typedef struct png_sPLT_entry_struct
574 png_uint_16 frequency
;
576 typedef png_sPLT_entry FAR
* png_sPLT_entryp
;
577 typedef png_sPLT_entry FAR
* FAR
* png_sPLT_entrypp
;
579 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
580 * occupy the LSB of their respective members, and the MSB of each member
581 * is zero-filled. The frequency member always occupies the full 16 bits.
584 typedef struct png_sPLT_struct
586 png_charp name
; /* palette name */
587 png_byte depth
; /* depth of palette samples */
588 png_sPLT_entryp entries
; /* palette entries */
589 png_int_32 nentries
; /* number of palette entries */
591 typedef png_sPLT_t FAR
* png_sPLT_tp
;
592 typedef png_sPLT_t FAR
* FAR
* png_sPLT_tpp
;
594 #ifdef PNG_TEXT_SUPPORTED
595 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
596 * and whether that contents is compressed or not. The "key" field
597 * points to a regular zero-terminated C string. The "text", "lang", and
598 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
599 * However, the * structure returned by png_get_text() will always contain
600 * regular zero-terminated C strings (possibly empty), never NULL pointers,
601 * so they can be safely used in printf() and other string-handling functions.
603 typedef struct png_text_struct
605 int compression
; /* compression value:
610 png_charp key
; /* keyword, 1-79 character description of "text" */
611 png_charp text
; /* comment, may be an empty string (ie "")
613 png_size_t text_length
; /* length of the text string */
614 #ifdef PNG_iTXt_SUPPORTED
615 png_size_t itxt_length
; /* length of the itxt string */
616 png_charp lang
; /* language code, 0-79 characters
618 png_charp lang_key
; /* keyword translated UTF-8 string, 0 or more
619 chars or a NULL pointer */
622 typedef png_text FAR
* png_textp
;
623 typedef png_text FAR
* FAR
* png_textpp
;
626 /* Supported compression types for text in PNG files (tEXt, and zTXt).
627 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
628 #define PNG_TEXT_COMPRESSION_NONE_WR -3
629 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
630 #define PNG_TEXT_COMPRESSION_NONE -1
631 #define PNG_TEXT_COMPRESSION_zTXt 0
632 #define PNG_ITXT_COMPRESSION_NONE 1
633 #define PNG_ITXT_COMPRESSION_zTXt 2
634 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
636 /* png_time is a way to hold the time in an machine independent way.
637 * Two conversions are provided, both from time_t and struct tm. There
638 * is no portable way to convert to either of these structures, as far
639 * as I know. If you know of a portable way, send it to me. As a side
640 * note - PNG has always been Year 2000 compliant!
642 typedef struct png_time_struct
644 png_uint_16 year
; /* full year, as in, 1995 */
645 png_byte month
; /* month of year, 1 - 12 */
646 png_byte day
; /* day of month, 1 - 31 */
647 png_byte hour
; /* hour of day, 0 - 23 */
648 png_byte minute
; /* minute of hour, 0 - 59 */
649 png_byte second
; /* second of minute, 0 - 60 (for leap seconds) */
651 typedef png_time FAR
* png_timep
;
652 typedef png_time FAR
* FAR
* png_timepp
;
654 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
655 /* png_unknown_chunk is a structure to hold queued chunks for which there is
656 * no specific support. The idea is that we can use this to queue
657 * up private chunks for output even though the library doesn't actually
658 * know about their semantics.
660 #define PNG_CHUNK_NAME_LENGTH 5
661 typedef struct png_unknown_chunk_t
663 png_byte name
[PNG_CHUNK_NAME_LENGTH
];
667 /* libpng-using applications should NOT directly modify this byte. */
668 png_byte location
; /* mode of operation at read time */
671 typedef png_unknown_chunk FAR
* png_unknown_chunkp
;
672 typedef png_unknown_chunk FAR
* FAR
* png_unknown_chunkpp
;
675 /* png_info is a structure that holds the information in a PNG file so
676 * that the application can find out the characteristics of the image.
677 * If you are reading the file, this structure will tell you what is
678 * in the PNG file. If you are writing the file, fill in the information
679 * you want to put into the PNG file, then call png_write_info().
680 * The names chosen should be very close to the PNG specification, so
681 * consult that document for information about the meaning of each field.
683 * With libpng < 0.95, it was only possible to directly set and read the
684 * the values in the png_info_struct, which meant that the contents and
685 * order of the values had to remain fixed. With libpng 0.95 and later,
686 * however, there are now functions that abstract the contents of
687 * png_info_struct from the application, so this makes it easier to use
688 * libpng with dynamic libraries, and even makes it possible to use
689 * libraries that don't have all of the libpng ancillary chunk-handing
692 * In any case, the order of the parameters in png_info_struct should NOT
693 * be changed for as long as possible to keep compatibility with applications
694 * that use the old direct-access method with png_info_struct.
696 * The following members may have allocated storage attached that should be
697 * cleaned up before the structure is discarded: palette, trans, text,
698 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
699 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
700 * are automatically freed when the info structure is deallocated, if they were
701 * allocated internally by libpng. This behavior can be changed by means
702 * of the png_data_freer() function.
704 * More allocation details: all the chunk-reading functions that
705 * change these members go through the corresponding png_set_*
706 * functions. A function to clear these members is available: see
707 * png_free_data(). The png_set_* functions do not depend on being
708 * able to point info structure members to any of the storage they are
709 * passed (they make their own copies), EXCEPT that the png_set_text
710 * functions use the same storage passed to them in the text_ptr or
711 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
712 * functions do not make their own copies.
714 typedef struct png_info_struct
716 /* the following are necessary for every PNG file */
717 png_uint_32 width
; /* width of image in pixels (from IHDR) */
718 png_uint_32 height
; /* height of image in pixels (from IHDR) */
719 png_uint_32 valid
; /* valid chunk data (see PNG_INFO_ below) */
720 png_uint_32 rowbytes
; /* bytes needed to hold an untransformed row */
721 png_colorp palette
; /* array of color values (valid & PNG_INFO_PLTE) */
722 png_uint_16 num_palette
; /* number of color entries in "palette" (PLTE) */
723 png_uint_16 num_trans
; /* number of transparent palette color (tRNS) */
724 png_byte bit_depth
; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
725 png_byte color_type
; /* see PNG_COLOR_TYPE_ below (from IHDR) */
726 /* The following three should have been named *_method not *_type */
727 png_byte compression_type
; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
728 png_byte filter_type
; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
729 png_byte interlace_type
; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
731 /* The following is informational only on read, and not used on writes. */
732 png_byte channels
; /* number of data channels per pixel (1, 2, 3, 4) */
733 png_byte pixel_depth
; /* number of bits per pixel */
734 png_byte spare_byte
; /* to align the data, and for future use */
735 png_byte signature
[8]; /* magic bytes read by libpng from start of file */
737 /* The rest of the data is optional. If you are reading, check the
738 * valid field to see if the information in these are valid. If you
739 * are writing, set the valid field to those chunks you want written,
740 * and initialize the appropriate fields below.
743 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
744 /* The gAMA chunk describes the gamma characteristics of the system
745 * on which the image was created, normally in the range [1.0, 2.5].
746 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
748 float gamma
; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
751 #if defined(PNG_sRGB_SUPPORTED)
753 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
754 png_byte srgb_intent
; /* sRGB rendering intent [0, 1, 2, or 3] */
757 #if defined(PNG_TEXT_SUPPORTED)
758 /* The tEXt, and zTXt chunks contain human-readable textual data in
759 * uncompressed, compressed, and optionally compressed forms, respectively.
760 * The data in "text" is an array of pointers to uncompressed,
761 * null-terminated C strings. Each chunk has a keyword that describes the
762 * textual data contained in that chunk. Keywords are not required to be
763 * unique, and the text string may be empty. Any number of text chunks may
766 int num_text
; /* number of comments read/to write */
767 int max_text
; /* current size of text array */
768 png_textp text
; /* array of comments read/to write */
769 #endif /* PNG_TEXT_SUPPORTED */
771 #if defined(PNG_tIME_SUPPORTED)
772 /* The tIME chunk holds the last time the displayed image data was
773 * modified. See the png_time struct for the contents of this struct.
778 #if defined(PNG_sBIT_SUPPORTED)
779 /* The sBIT chunk specifies the number of significant high-order bits
780 * in the pixel data. Values are in the range [1, bit_depth], and are
781 * only specified for the channels in the pixel data. The contents of
782 * the low-order bits is not specified. Data is valid if
783 * (valid & PNG_INFO_sBIT) is non-zero.
785 png_color_8 sig_bit
; /* significant bits in color channels */
788 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
789 defined(PNG_READ_BACKGROUND_SUPPORTED)
790 /* The tRNS chunk supplies transparency data for paletted images and
791 * other image types that don't need a full alpha channel. There are
792 * "num_trans" transparency values for a paletted image, stored in the
793 * same order as the palette colors, starting from index 0. Values
794 * for the data are in the range [0, 255], ranging from fully transparent
795 * to fully opaque, respectively. For non-paletted images, there is a
796 * single color specified that should be treated as fully transparent.
797 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
799 png_bytep trans
; /* transparent values for paletted image */
800 png_color_16 trans_values
; /* transparent color for non-palette image */
803 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
804 /* The bKGD chunk gives the suggested image background color if the
805 * display program does not have its own background color and the image
806 * is needs to composited onto a background before display. The colors
807 * in "background" are normally in the same color space/depth as the
808 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
810 png_color_16 background
;
813 #if defined(PNG_oFFs_SUPPORTED)
814 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
815 * and downwards from the top-left corner of the display, page, or other
816 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
817 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
819 png_int_32 x_offset
; /* x offset on page */
820 png_int_32 y_offset
; /* y offset on page */
821 png_byte offset_unit_type
; /* offset units type */
824 #if defined(PNG_pHYs_SUPPORTED)
825 /* The pHYs chunk gives the physical pixel density of the image for
826 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
827 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
829 png_uint_32 x_pixels_per_unit
; /* horizontal pixel density */
830 png_uint_32 y_pixels_per_unit
; /* vertical pixel density */
831 png_byte phys_unit_type
; /* resolution type (see PNG_RESOLUTION_ below) */
834 #if defined(PNG_hIST_SUPPORTED)
835 /* The hIST chunk contains the relative frequency or importance of the
836 * various palette entries, so that a viewer can intelligently select a
837 * reduced-color palette, if required. Data is an array of "num_palette"
838 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
844 #ifdef PNG_cHRM_SUPPORTED
845 /* The cHRM chunk describes the CIE color characteristics of the monitor
846 * on which the PNG was created. This data allows the viewer to do gamut
847 * mapping of the input image to ensure that the viewer sees the same
848 * colors in the image as the creator. Values are in the range
849 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
851 #ifdef PNG_FLOATING_POINT_SUPPORTED
863 #if defined(PNG_pCAL_SUPPORTED)
864 /* The pCAL chunk describes a transformation between the stored pixel
865 * values and original physical data values used to create the image.
866 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
867 * range given by [pcal_X0, pcal_X1], and are further transformed by a
868 * (possibly non-linear) transformation function given by "pcal_type"
869 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
870 * defines below, and the PNG-Group's PNG extensions document for a
871 * complete description of the transformations and how they should be
872 * implemented, and for a description of the ASCII parameter strings.
873 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
875 png_charp pcal_purpose
; /* pCAL chunk description string */
876 png_int_32 pcal_X0
; /* minimum value */
877 png_int_32 pcal_X1
; /* maximum value */
878 png_charp pcal_units
; /* Latin-1 string giving physical units */
879 png_charpp pcal_params
; /* ASCII strings containing parameter values */
880 png_byte pcal_type
; /* equation type (see PNG_EQUATION_ below) */
881 png_byte pcal_nparams
; /* number of parameters given in pcal_params */
884 /* New members added in libpng-1.0.6 */
885 #ifdef PNG_FREE_ME_SUPPORTED
886 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
889 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
890 /* storage for unknown chunks that the library doesn't recognize. */
891 png_unknown_chunkp unknown_chunks
;
892 png_size_t unknown_chunks_num
;
895 #if defined(PNG_iCCP_SUPPORTED)
896 /* iCCP chunk data. */
897 png_charp iccp_name
; /* profile name */
898 png_charp iccp_profile
; /* International Color Consortium profile data */
899 /* Note to maintainer: should be png_bytep */
900 png_uint_32 iccp_proflen
; /* ICC profile data length */
901 png_byte iccp_compression
; /* Always zero */
904 #if defined(PNG_sPLT_SUPPORTED)
905 /* data on sPLT chunks (there may be more than one). */
906 png_sPLT_tp splt_palettes
;
907 png_uint_32 splt_palettes_num
;
910 #if defined(PNG_sCAL_SUPPORTED)
911 /* The sCAL chunk describes the actual physical dimensions of the
912 * subject matter of the graphic. The chunk contains a unit specification
913 * a byte value, and two ASCII strings representing floating-point
914 * values. The values are width and height corresponsing to one pixel
915 * in the image. This external representation is converted to double
916 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
918 png_byte scal_unit
; /* unit of physical scale */
919 #ifdef PNG_FLOATING_POINT_SUPPORTED
920 double scal_pixel_width
; /* width of one pixel */
921 double scal_pixel_height
; /* height of one pixel */
923 #ifdef PNG_FIXED_POINT_SUPPORTED
924 png_charp scal_s_width
; /* string containing height */
925 png_charp scal_s_height
; /* string containing width */
929 #if defined(PNG_INFO_IMAGE_SUPPORTED)
930 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
931 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
932 png_bytepp row_pointers
; /* the image bits */
935 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
936 png_fixed_point int_gamma
; /* gamma of image, if (valid & PNG_INFO_gAMA) */
939 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
940 png_fixed_point int_x_white
;
941 png_fixed_point int_y_white
;
942 png_fixed_point int_x_red
;
943 png_fixed_point int_y_red
;
944 png_fixed_point int_x_green
;
945 png_fixed_point int_y_green
;
946 png_fixed_point int_x_blue
;
947 png_fixed_point int_y_blue
;
952 typedef png_info FAR
* png_infop
;
953 typedef png_info FAR
* FAR
* png_infopp
;
955 /* Maximum positive integer used in PNG is (2^31)-1 */
956 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
957 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
958 #define PNG_SIZE_MAX ((png_size_t)(-1))
959 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
960 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
961 #define PNG_MAX_UINT PNG_UINT_31_MAX
964 /* These describe the color_type field in png_info. */
965 /* color type masks */
966 #define PNG_COLOR_MASK_PALETTE 1
967 #define PNG_COLOR_MASK_COLOR 2
968 #define PNG_COLOR_MASK_ALPHA 4
970 /* color types. Note that not all combinations are legal */
971 #define PNG_COLOR_TYPE_GRAY 0
972 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
973 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
974 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
975 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
977 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
978 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
980 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
981 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
982 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
984 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
985 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
986 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
987 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
989 /* These are for the interlacing type. These values should NOT be changed. */
990 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
991 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
992 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
994 /* These are for the oFFs chunk. These values should NOT be changed. */
995 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
996 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
997 #define PNG_OFFSET_LAST 2 /* Not a valid value */
999 /* These are for the pCAL chunk. These values should NOT be changed. */
1000 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1001 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1002 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1003 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1004 #define PNG_EQUATION_LAST 4 /* Not a valid value */
1006 /* These are for the sCAL chunk. These values should NOT be changed. */
1007 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1008 #define PNG_SCALE_METER 1 /* meters per pixel */
1009 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
1010 #define PNG_SCALE_LAST 3 /* Not a valid value */
1012 /* These are for the pHYs chunk. These values should NOT be changed. */
1013 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1014 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
1015 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1017 /* These are for the sRGB chunk. These values should NOT be changed. */
1018 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1019 #define PNG_sRGB_INTENT_RELATIVE 1
1020 #define PNG_sRGB_INTENT_SATURATION 2
1021 #define PNG_sRGB_INTENT_ABSOLUTE 3
1022 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1024 /* This is for text chunks */
1025 #define PNG_KEYWORD_MAX_LENGTH 79
1027 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1028 #define PNG_MAX_PALETTE_LENGTH 256
1030 /* These determine if an ancillary chunk's data has been successfully read
1031 * from the PNG header, or if the application has filled in the corresponding
1032 * data in the info_struct to be written into the output file. The values
1033 * of the PNG_INFO_<chunk> defines should NOT be changed.
1035 #define PNG_INFO_gAMA 0x0001
1036 #define PNG_INFO_sBIT 0x0002
1037 #define PNG_INFO_cHRM 0x0004
1038 #define PNG_INFO_PLTE 0x0008
1039 #define PNG_INFO_tRNS 0x0010
1040 #define PNG_INFO_bKGD 0x0020
1041 #define PNG_INFO_hIST 0x0040
1042 #define PNG_INFO_pHYs 0x0080
1043 #define PNG_INFO_oFFs 0x0100
1044 #define PNG_INFO_tIME 0x0200
1045 #define PNG_INFO_pCAL 0x0400
1046 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1047 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1048 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1049 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1050 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1052 /* This is used for the transformation routines, as some of them
1053 * change these values for the row. It also should enable using
1054 * the routines for other purposes.
1056 typedef struct png_row_info_struct
1058 png_uint_32 width
; /* width of row */
1059 png_uint_32 rowbytes
; /* number of bytes in row */
1060 png_byte color_type
; /* color type of row */
1061 png_byte bit_depth
; /* bit depth of row */
1062 png_byte channels
; /* number of channels (1, 2, 3, or 4) */
1063 png_byte pixel_depth
; /* bits per pixel (depth * channels) */
1066 typedef png_row_info FAR
* png_row_infop
;
1067 typedef png_row_info FAR
* FAR
* png_row_infopp
;
1069 /* These are the function types for the I/O functions and for the functions
1070 * that allow the user to override the default I/O functions with his or her
1071 * own. The png_error_ptr type should match that of user-supplied warning
1072 * and error functions, while the png_rw_ptr type should match that of the
1073 * user read/write data functions.
1075 typedef struct png_struct_def png_struct
;
1076 typedef png_struct FAR
* png_structp
;
1078 typedef void (PNGAPI
*png_error_ptr
) PNGARG((png_structp
, png_const_charp
));
1079 typedef void (PNGAPI
*png_rw_ptr
) PNGARG((png_structp
, png_bytep
, png_size_t
));
1080 typedef void (PNGAPI
*png_flush_ptr
) PNGARG((png_structp
));
1081 typedef void (PNGAPI
*png_read_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1083 typedef void (PNGAPI
*png_write_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1086 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1087 typedef void (PNGAPI
*png_progressive_info_ptr
) PNGARG((png_structp
, png_infop
));
1088 typedef void (PNGAPI
*png_progressive_end_ptr
) PNGARG((png_structp
, png_infop
));
1089 typedef void (PNGAPI
*png_progressive_row_ptr
) PNGARG((png_structp
, png_bytep
,
1093 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1094 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1095 defined(PNG_LEGACY_SUPPORTED)
1096 typedef void (PNGAPI
*png_user_transform_ptr
) PNGARG((png_structp
,
1097 png_row_infop
, png_bytep
));
1100 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1101 typedef int (PNGAPI
*png_user_chunk_ptr
) PNGARG((png_structp
, png_unknown_chunkp
));
1103 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1104 typedef void (PNGAPI
*png_unknown_chunk_ptr
) PNGARG((png_structp
));
1107 /* Transform masks for the high-level interface */
1108 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1109 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1110 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1111 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1112 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1113 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1114 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1115 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1116 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1117 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1118 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1119 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1120 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1122 /* Flags for MNG supported features */
1123 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1124 #define PNG_FLAG_MNG_FILTER_64 0x04
1125 #define PNG_ALL_MNG_FEATURES 0x05
1127 typedef png_voidp (*png_malloc_ptr
) PNGARG((png_structp
, png_size_t
));
1128 typedef void (*png_free_ptr
) PNGARG((png_structp
, png_voidp
));
1130 /* The structure that holds the information to read and write PNG files.
1131 * The only people who need to care about what is inside of this are the
1132 * people who will be modifying the library for their own special needs.
1133 * It should NOT be accessed directly by an application, except to store
1137 struct png_struct_def
1139 #ifdef PNG_SETJMP_SUPPORTED
1140 jmp_buf jmpbuf
; /* used in png_error */
1142 png_error_ptr error_fn
; /* function for printing errors and aborting */
1143 png_error_ptr warning_fn
; /* function for printing warnings */
1144 png_voidp error_ptr
; /* user supplied struct for error functions */
1145 png_rw_ptr write_data_fn
; /* function for writing output data */
1146 png_rw_ptr read_data_fn
; /* function for reading input data */
1147 png_voidp io_ptr
; /* ptr to application struct for I/O functions */
1149 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1150 png_user_transform_ptr read_user_transform_fn
; /* user read transform */
1153 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1154 png_user_transform_ptr write_user_transform_fn
; /* user write transform */
1157 /* These were added in libpng-1.0.2 */
1158 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1159 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1160 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1161 png_voidp user_transform_ptr
; /* user supplied struct for user transform */
1162 png_byte user_transform_depth
; /* bit depth of user transformed pixels */
1163 png_byte user_transform_channels
; /* channels in user transformed pixels */
1167 png_uint_32 mode
; /* tells us where we are in the PNG file */
1168 png_uint_32 flags
; /* flags indicating various things to libpng */
1169 png_uint_32 transformations
; /* which transformations to perform */
1171 z_stream zstream
; /* pointer to decompression structure (below) */
1172 png_bytep zbuf
; /* buffer for zlib */
1173 png_size_t zbuf_size
; /* size of zbuf */
1174 int zlib_level
; /* holds zlib compression level */
1175 int zlib_method
; /* holds zlib compression method */
1176 int zlib_window_bits
; /* holds zlib compression window bits */
1177 int zlib_mem_level
; /* holds zlib compression memory level */
1178 int zlib_strategy
; /* holds zlib compression strategy */
1180 png_uint_32 width
; /* width of image in pixels */
1181 png_uint_32 height
; /* height of image in pixels */
1182 png_uint_32 num_rows
; /* number of rows in current pass */
1183 png_uint_32 usr_width
; /* width of row at start of write */
1184 png_uint_32 rowbytes
; /* size of row in bytes */
1185 png_uint_32 irowbytes
; /* size of current interlaced row in bytes */
1186 png_uint_32 iwidth
; /* width of current interlaced row in pixels */
1187 png_uint_32 row_number
; /* current row in interlace pass */
1188 png_bytep prev_row
; /* buffer to save previous (unfiltered) row */
1189 png_bytep row_buf
; /* buffer to save current (unfiltered) row */
1190 #ifndef PNG_NO_WRITE_FILTERING
1191 png_bytep sub_row
; /* buffer to save "sub" row when filtering */
1192 png_bytep up_row
; /* buffer to save "up" row when filtering */
1193 png_bytep avg_row
; /* buffer to save "avg" row when filtering */
1194 png_bytep paeth_row
; /* buffer to save "Paeth" row when filtering */
1196 png_row_info row_info
; /* used for transformation routines */
1198 png_uint_32 idat_size
; /* current IDAT size for read */
1199 png_uint_32 crc
; /* current chunk CRC value */
1200 png_colorp palette
; /* palette from the input file */
1201 png_uint_16 num_palette
; /* number of color entries in palette */
1202 png_uint_16 num_trans
; /* number of transparency values */
1203 png_byte chunk_name
[5]; /* null-terminated name of current chunk */
1204 png_byte compression
; /* file compression type (always 0) */
1205 png_byte filter
; /* file filter type (always 0) */
1206 png_byte interlaced
; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1207 png_byte pass
; /* current interlace pass (0 - 6) */
1208 png_byte do_filter
; /* row filter flags (see PNG_FILTER_ below ) */
1209 png_byte color_type
; /* color type of file */
1210 png_byte bit_depth
; /* bit depth of file */
1211 png_byte usr_bit_depth
; /* bit depth of users row */
1212 png_byte pixel_depth
; /* number of bits per pixel */
1213 png_byte channels
; /* number of channels in file */
1214 png_byte usr_channels
; /* channels at start of write */
1215 png_byte sig_bytes
; /* magic bytes read/written from start of file */
1217 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1218 #ifdef PNG_LEGACY_SUPPORTED
1219 png_byte filler
; /* filler byte for pixel expansion */
1221 png_uint_16 filler
; /* filler bytes for pixel expansion */
1225 #if defined(PNG_bKGD_SUPPORTED)
1226 png_byte background_gamma_type
;
1227 # ifdef PNG_FLOATING_POINT_SUPPORTED
1228 float background_gamma
;
1230 png_color_16 background
; /* background color in screen gamma space */
1231 #if defined(PNG_READ_GAMMA_SUPPORTED)
1232 png_color_16 background_1
; /* background normalized to gamma 1.0 */
1234 #endif /* PNG_bKGD_SUPPORTED */
1236 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1237 png_flush_ptr output_flush_fn
;/* Function for flushing output */
1238 png_uint_32 flush_dist
; /* how many rows apart to flush, 0 - no flush */
1239 png_uint_32 flush_rows
; /* number of rows written since last flush */
1242 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1243 int gamma_shift
; /* number of "insignificant" bits 16-bit gamma */
1244 #ifdef PNG_FLOATING_POINT_SUPPORTED
1245 float gamma
; /* file gamma value */
1246 float screen_gamma
; /* screen gamma value (display_exponent) */
1250 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1251 png_bytep gamma_table
; /* gamma table for 8-bit depth files */
1252 png_bytep gamma_from_1
; /* converts from 1.0 to screen */
1253 png_bytep gamma_to_1
; /* converts from file to 1.0 */
1254 png_uint_16pp gamma_16_table
; /* gamma table for 16-bit depth files */
1255 png_uint_16pp gamma_16_from_1
; /* converts from 1.0 to screen */
1256 png_uint_16pp gamma_16_to_1
; /* converts from file to 1.0 */
1259 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1260 png_color_8 sig_bit
; /* significant bits in each available channel */
1263 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1264 png_color_8 shift
; /* shift for significant bit tranformation */
1267 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1268 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1269 png_bytep trans
; /* transparency values for paletted files */
1270 png_color_16 trans_values
; /* transparency values for non-paletted files */
1273 png_read_status_ptr read_row_fn
; /* called after each row is decoded */
1274 png_write_status_ptr write_row_fn
; /* called after each row is encoded */
1275 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1276 png_progressive_info_ptr info_fn
; /* called after header data fully read */
1277 png_progressive_row_ptr row_fn
; /* called after each prog. row is decoded */
1278 png_progressive_end_ptr end_fn
; /* called after image is complete */
1279 png_bytep save_buffer_ptr
; /* current location in save_buffer */
1280 png_bytep save_buffer
; /* buffer for previously read data */
1281 png_bytep current_buffer_ptr
; /* current location in current_buffer */
1282 png_bytep current_buffer
; /* buffer for recently used data */
1283 png_uint_32 push_length
; /* size of current input chunk */
1284 png_uint_32 skip_length
; /* bytes to skip in input data */
1285 png_size_t save_buffer_size
; /* amount of data now in save_buffer */
1286 png_size_t save_buffer_max
; /* total size of save_buffer */
1287 png_size_t buffer_size
; /* total amount of available input data */
1288 png_size_t current_buffer_size
; /* amount of data now in current_buffer */
1289 int process_mode
; /* what push library is currently doing */
1290 int cur_palette
; /* current push library palette index */
1292 # if defined(PNG_TEXT_SUPPORTED)
1293 png_size_t current_text_size
; /* current size of text input data */
1294 png_size_t current_text_left
; /* how much text left to read in input */
1295 png_charp current_text
; /* current text chunk buffer */
1296 png_charp current_text_ptr
; /* current location in current_text */
1297 # endif /* PNG_TEXT_SUPPORTED */
1298 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1300 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1301 /* for the Borland special 64K segment handler */
1302 png_bytepp offset_table_ptr
;
1303 png_bytep offset_table
;
1304 png_uint_16 offset_table_number
;
1305 png_uint_16 offset_table_count
;
1306 png_uint_16 offset_table_count_free
;
1309 #if defined(PNG_READ_DITHER_SUPPORTED)
1310 png_bytep palette_lookup
; /* lookup table for dithering */
1311 png_bytep dither_index
; /* index translation for palette files */
1314 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1315 png_uint_16p hist
; /* histogram */
1318 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1319 png_byte heuristic_method
; /* heuristic for row filter selection */
1320 png_byte num_prev_filters
; /* number of weights for previous rows */
1321 png_bytep prev_filters
; /* filter type(s) of previous row(s) */
1322 png_uint_16p filter_weights
; /* weight(s) for previous line(s) */
1323 png_uint_16p inv_filter_weights
; /* 1/weight(s) for previous line(s) */
1324 png_uint_16p filter_costs
; /* relative filter calculation cost */
1325 png_uint_16p inv_filter_costs
; /* 1/relative filter calculation cost */
1328 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1329 png_charp time_buffer
; /* String to hold RFC 1123 time text */
1332 /* New members added in libpng-1.0.6 */
1334 #ifdef PNG_FREE_ME_SUPPORTED
1335 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
1338 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1339 png_voidp user_chunk_ptr
;
1340 png_user_chunk_ptr read_user_chunk_fn
; /* user read chunk handler */
1343 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1345 png_bytep chunk_list
;
1348 /* New members added in libpng-1.0.3 */
1349 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1350 png_byte rgb_to_gray_status
;
1351 /* These were changed from png_byte in libpng-1.0.6 */
1352 png_uint_16 rgb_to_gray_red_coeff
;
1353 png_uint_16 rgb_to_gray_green_coeff
;
1354 png_uint_16 rgb_to_gray_blue_coeff
;
1357 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1358 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1359 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1360 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1361 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1363 png_byte mng_features_permitted
;
1365 png_uint_32 mng_features_permitted
;
1366 #endif /* PNG_1_0_X */
1369 /* New member added in libpng-1.0.7 */
1370 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1371 png_fixed_point int_gamma
;
1374 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1375 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1376 png_byte filter_type
;
1379 #if defined(PNG_1_0_X)
1380 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1381 png_uint_32 row_buf_size
;
1384 /* New members added in libpng-1.2.0 */
1385 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1386 # if !defined(PNG_1_0_X)
1387 # if defined(PNG_MMX_CODE_SUPPORTED)
1388 png_byte mmx_bitdepth_threshold
;
1389 png_uint_32 mmx_rowbytes_threshold
;
1391 png_uint_32 asm_flags
;
1395 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1396 #ifdef PNG_USER_MEM_SUPPORTED
1397 png_voidp mem_ptr
; /* user supplied struct for mem functions */
1398 png_malloc_ptr malloc_fn
; /* function for allocating memory */
1399 png_free_ptr free_fn
; /* function for freeing memory */
1402 /* New member added in libpng-1.0.13 and 1.2.0 */
1403 png_bytep big_row_buf
; /* buffer to save current (unfiltered) row */
1405 #if defined(PNG_READ_DITHER_SUPPORTED)
1406 /* The following three members were added at version 1.0.14 and 1.2.4 */
1407 png_bytep dither_sort
; /* working sort array */
1408 png_bytep index_to_palette
; /* where the original index currently is */
1409 /* in the palette */
1410 png_bytep palette_to_index
; /* which original index points to this */
1414 /* New members added in libpng-1.0.16 and 1.2.6 */
1415 png_byte compression_type
;
1417 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1418 png_uint_32 user_width_max
;
1419 png_uint_32 user_height_max
;
1422 /* New member added in libpng-1.0.25 and 1.2.17 */
1423 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1424 /* storage for unknown chunk that the library doesn't recognize. */
1425 png_unknown_chunk unknown_chunk
;
1430 /* This triggers a compiler error in png.c, if png.c and png.h
1431 * do not agree upon the version number.
1433 typedef png_structp version_1_2_24
;
1435 typedef png_struct FAR
* FAR
* png_structpp
;
1437 /* Here are the function definitions most commonly used. This is not
1438 * the place to find out how to use libpng. See libpng.txt for the
1439 * full explanation, see example.c for the summary. This just provides
1440 * a simple one line description of the use of each function.
1443 /* Returns the version number of the library */
1444 extern PNG_EXPORT(png_uint_32
,png_access_version_number
) PNGARG((void));
1446 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1447 * Handling more than 8 bytes from the beginning of the file is an error.
1449 extern PNG_EXPORT(void,png_set_sig_bytes
) PNGARG((png_structp png_ptr
,
1452 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1453 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1454 * signature, and non-zero otherwise. Having num_to_check == 0 or
1455 * start > 7 will always fail (ie return non-zero).
1457 extern PNG_EXPORT(int,png_sig_cmp
) PNGARG((png_bytep sig
, png_size_t start
,
1458 png_size_t num_to_check
));
1460 /* Simple signature checking function. This is the same as calling
1461 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1463 extern PNG_EXPORT(int,png_check_sig
) PNGARG((png_bytep sig
, int num
));
1465 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1466 extern PNG_EXPORT(png_structp
,png_create_read_struct
)
1467 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1468 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1470 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1471 extern PNG_EXPORT(png_structp
,png_create_write_struct
)
1472 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1473 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1475 #ifdef PNG_WRITE_SUPPORTED
1476 extern PNG_EXPORT(png_uint_32
,png_get_compression_buffer_size
)
1477 PNGARG((png_structp png_ptr
));
1480 #ifdef PNG_WRITE_SUPPORTED
1481 extern PNG_EXPORT(void,png_set_compression_buffer_size
)
1482 PNGARG((png_structp png_ptr
, png_uint_32 size
));
1485 /* Reset the compression stream */
1486 extern PNG_EXPORT(int,png_reset_zstream
) PNGARG((png_structp png_ptr
));
1488 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1489 #ifdef PNG_USER_MEM_SUPPORTED
1490 extern PNG_EXPORT(png_structp
,png_create_read_struct_2
)
1491 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1492 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1493 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1494 extern PNG_EXPORT(png_structp
,png_create_write_struct_2
)
1495 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1496 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1497 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1500 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1501 extern PNG_EXPORT(void,png_write_chunk
) PNGARG((png_structp png_ptr
,
1502 png_bytep chunk_name
, png_bytep data
, png_size_t length
));
1504 /* Write the start of a PNG chunk - length and chunk name. */
1505 extern PNG_EXPORT(void,png_write_chunk_start
) PNGARG((png_structp png_ptr
,
1506 png_bytep chunk_name
, png_uint_32 length
));
1508 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1509 extern PNG_EXPORT(void,png_write_chunk_data
) PNGARG((png_structp png_ptr
,
1510 png_bytep data
, png_size_t length
));
1512 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1513 extern PNG_EXPORT(void,png_write_chunk_end
) PNGARG((png_structp png_ptr
));
1515 /* Allocate and initialize the info structure */
1516 extern PNG_EXPORT(png_infop
,png_create_info_struct
)
1517 PNGARG((png_structp png_ptr
));
1519 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1520 /* Initialize the info structure (old interface - DEPRECATED) */
1521 extern PNG_EXPORT(void,png_info_init
) PNGARG((png_infop info_ptr
));
1522 #undef png_info_init
1523 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1524 png_sizeof(png_info));
1527 extern PNG_EXPORT(void,png_info_init_3
) PNGARG((png_infopp info_ptr
,
1528 png_size_t png_info_struct_size
));
1530 /* Writes all the PNG information before the image. */
1531 extern PNG_EXPORT(void,png_write_info_before_PLTE
) PNGARG((png_structp png_ptr
,
1532 png_infop info_ptr
));
1533 extern PNG_EXPORT(void,png_write_info
) PNGARG((png_structp png_ptr
,
1534 png_infop info_ptr
));
1536 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1537 /* read the information before the actual image data. */
1538 extern PNG_EXPORT(void,png_read_info
) PNGARG((png_structp png_ptr
,
1539 png_infop info_ptr
));
1542 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1543 extern PNG_EXPORT(png_charp
,png_convert_to_rfc1123
)
1544 PNGARG((png_structp png_ptr
, png_timep ptime
));
1547 #if !defined(_WIN32_WCE)
1548 /* "time.h" functions are not supported on WindowsCE */
1549 #if defined(PNG_WRITE_tIME_SUPPORTED)
1550 /* convert from a struct tm to png_time */
1551 extern PNG_EXPORT(void,png_convert_from_struct_tm
) PNGARG((png_timep ptime
,
1552 struct tm FAR
* ttime
));
1554 /* convert from time_t to png_time. Uses gmtime() */
1555 extern PNG_EXPORT(void,png_convert_from_time_t
) PNGARG((png_timep ptime
,
1557 #endif /* PNG_WRITE_tIME_SUPPORTED */
1558 #endif /* _WIN32_WCE */
1560 #if defined(PNG_READ_EXPAND_SUPPORTED)
1561 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1562 extern PNG_EXPORT(void,png_set_expand
) PNGARG((png_structp png_ptr
));
1563 #if !defined(PNG_1_0_X)
1564 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8
) PNGARG((png_structp
1567 extern PNG_EXPORT(void,png_set_palette_to_rgb
) PNGARG((png_structp png_ptr
));
1568 extern PNG_EXPORT(void,png_set_tRNS_to_alpha
) PNGARG((png_structp png_ptr
));
1569 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1571 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8
) PNGARG((png_structp png_ptr
));
1575 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1576 /* Use blue, green, red order for pixels. */
1577 extern PNG_EXPORT(void,png_set_bgr
) PNGARG((png_structp png_ptr
));
1580 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1581 /* Expand the grayscale to 24-bit RGB if necessary. */
1582 extern PNG_EXPORT(void,png_set_gray_to_rgb
) PNGARG((png_structp png_ptr
));
1585 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1586 /* Reduce RGB to grayscale. */
1587 #ifdef PNG_FLOATING_POINT_SUPPORTED
1588 extern PNG_EXPORT(void,png_set_rgb_to_gray
) PNGARG((png_structp png_ptr
,
1589 int error_action
, double red
, double green
));
1591 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed
) PNGARG((png_structp png_ptr
,
1592 int error_action
, png_fixed_point red
, png_fixed_point green
));
1593 extern PNG_EXPORT(png_byte
,png_get_rgb_to_gray_status
) PNGARG((png_structp
1597 extern PNG_EXPORT(void,png_build_grayscale_palette
) PNGARG((int bit_depth
,
1598 png_colorp palette
));
1600 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1601 extern PNG_EXPORT(void,png_set_strip_alpha
) PNGARG((png_structp png_ptr
));
1604 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1605 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1606 extern PNG_EXPORT(void,png_set_swap_alpha
) PNGARG((png_structp png_ptr
));
1609 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1610 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1611 extern PNG_EXPORT(void,png_set_invert_alpha
) PNGARG((png_structp png_ptr
));
1614 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1615 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1616 extern PNG_EXPORT(void,png_set_filler
) PNGARG((png_structp png_ptr
,
1617 png_uint_32 filler
, int flags
));
1618 /* The values of the PNG_FILLER_ defines should NOT be changed */
1619 #define PNG_FILLER_BEFORE 0
1620 #define PNG_FILLER_AFTER 1
1621 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1622 #if !defined(PNG_1_0_X)
1623 extern PNG_EXPORT(void,png_set_add_alpha
) PNGARG((png_structp png_ptr
,
1624 png_uint_32 filler
, int flags
));
1626 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1628 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1629 /* Swap bytes in 16-bit depth files. */
1630 extern PNG_EXPORT(void,png_set_swap
) PNGARG((png_structp png_ptr
));
1633 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1634 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1635 extern PNG_EXPORT(void,png_set_packing
) PNGARG((png_structp png_ptr
));
1638 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1639 /* Swap packing order of pixels in bytes. */
1640 extern PNG_EXPORT(void,png_set_packswap
) PNGARG((png_structp png_ptr
));
1643 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1644 /* Converts files to legal bit depths. */
1645 extern PNG_EXPORT(void,png_set_shift
) PNGARG((png_structp png_ptr
,
1646 png_color_8p true_bits
));
1649 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1650 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1651 /* Have the code handle the interlacing. Returns the number of passes. */
1652 extern PNG_EXPORT(int,png_set_interlace_handling
) PNGARG((png_structp png_ptr
));
1655 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1656 /* Invert monochrome files */
1657 extern PNG_EXPORT(void,png_set_invert_mono
) PNGARG((png_structp png_ptr
));
1660 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1661 /* Handle alpha and tRNS by replacing with a background color. */
1662 #ifdef PNG_FLOATING_POINT_SUPPORTED
1663 extern PNG_EXPORT(void,png_set_background
) PNGARG((png_structp png_ptr
,
1664 png_color_16p background_color
, int background_gamma_code
,
1665 int need_expand
, double background_gamma
));
1667 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1668 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1669 #define PNG_BACKGROUND_GAMMA_FILE 2
1670 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1673 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1674 /* strip the second byte of information from a 16-bit depth file. */
1675 extern PNG_EXPORT(void,png_set_strip_16
) PNGARG((png_structp png_ptr
));
1678 #if defined(PNG_READ_DITHER_SUPPORTED)
1679 /* Turn on dithering, and reduce the palette to the number of colors available. */
1680 extern PNG_EXPORT(void,png_set_dither
) PNGARG((png_structp png_ptr
,
1681 png_colorp palette
, int num_palette
, int maximum_colors
,
1682 png_uint_16p histogram
, int full_dither
));
1685 #if defined(PNG_READ_GAMMA_SUPPORTED)
1686 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1687 #ifdef PNG_FLOATING_POINT_SUPPORTED
1688 extern PNG_EXPORT(void,png_set_gamma
) PNGARG((png_structp png_ptr
,
1689 double screen_gamma
, double default_file_gamma
));
1693 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1694 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1695 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1696 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1697 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1698 extern PNG_EXPORT(void,png_permit_empty_plte
) PNGARG((png_structp png_ptr
,
1699 int empty_plte_permitted
));
1703 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1704 /* Set how many lines between output flushes - 0 for no flushing */
1705 extern PNG_EXPORT(void,png_set_flush
) PNGARG((png_structp png_ptr
, int nrows
));
1706 /* Flush the current PNG output buffer */
1707 extern PNG_EXPORT(void,png_write_flush
) PNGARG((png_structp png_ptr
));
1710 /* optional update palette with requested transformations */
1711 extern PNG_EXPORT(void,png_start_read_image
) PNGARG((png_structp png_ptr
));
1713 /* optional call to update the users info structure */
1714 extern PNG_EXPORT(void,png_read_update_info
) PNGARG((png_structp png_ptr
,
1715 png_infop info_ptr
));
1717 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1718 /* read one or more rows of image data. */
1719 extern PNG_EXPORT(void,png_read_rows
) PNGARG((png_structp png_ptr
,
1720 png_bytepp row
, png_bytepp display_row
, png_uint_32 num_rows
));
1723 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1724 /* read a row of data. */
1725 extern PNG_EXPORT(void,png_read_row
) PNGARG((png_structp png_ptr
,
1727 png_bytep display_row
));
1730 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1731 /* read the whole image into memory at once. */
1732 extern PNG_EXPORT(void,png_read_image
) PNGARG((png_structp png_ptr
,
1736 /* write a row of image data */
1737 extern PNG_EXPORT(void,png_write_row
) PNGARG((png_structp png_ptr
,
1740 /* write a few rows of image data */
1741 extern PNG_EXPORT(void,png_write_rows
) PNGARG((png_structp png_ptr
,
1742 png_bytepp row
, png_uint_32 num_rows
));
1744 /* write the image data */
1745 extern PNG_EXPORT(void,png_write_image
) PNGARG((png_structp png_ptr
,
1748 /* writes the end of the PNG file. */
1749 extern PNG_EXPORT(void,png_write_end
) PNGARG((png_structp png_ptr
,
1750 png_infop info_ptr
));
1752 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1753 /* read the end of the PNG file. */
1754 extern PNG_EXPORT(void,png_read_end
) PNGARG((png_structp png_ptr
,
1755 png_infop info_ptr
));
1758 /* free any memory associated with the png_info_struct */
1759 extern PNG_EXPORT(void,png_destroy_info_struct
) PNGARG((png_structp png_ptr
,
1760 png_infopp info_ptr_ptr
));
1762 /* free any memory associated with the png_struct and the png_info_structs */
1763 extern PNG_EXPORT(void,png_destroy_read_struct
) PNGARG((png_structpp
1764 png_ptr_ptr
, png_infopp info_ptr_ptr
, png_infopp end_info_ptr_ptr
));
1766 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1767 extern void png_read_destroy
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
1768 png_infop end_info_ptr
));
1770 /* free any memory associated with the png_struct and the png_info_structs */
1771 extern PNG_EXPORT(void,png_destroy_write_struct
)
1772 PNGARG((png_structpp png_ptr_ptr
, png_infopp info_ptr_ptr
));
1774 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1775 extern void png_write_destroy
PNGARG((png_structp png_ptr
));
1777 /* set the libpng method of handling chunk CRC errors */
1778 extern PNG_EXPORT(void,png_set_crc_action
) PNGARG((png_structp png_ptr
,
1779 int crit_action
, int ancil_action
));
1781 /* Values for png_set_crc_action() to say how to handle CRC errors in
1782 * ancillary and critical chunks, and whether to use the data contained
1783 * therein. Note that it is impossible to "discard" data in a critical
1784 * chunk. For versions prior to 0.90, the action was always error/quit,
1785 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1786 * chunks is warn/discard. These values should NOT be changed.
1788 * value action:critical action:ancillary
1790 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1791 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1792 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1793 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1794 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1795 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1797 /* These functions give the user control over the scan-line filtering in
1798 * libpng and the compression methods used by zlib. These functions are
1799 * mainly useful for testing, as the defaults should work with most users.
1800 * Those users who are tight on memory or want faster performance at the
1801 * expense of compression can modify them. See the compression library
1802 * header file (zlib.h) for an explination of the compression functions.
1805 /* set the filtering method(s) used by libpng. Currently, the only valid
1806 * value for "method" is 0.
1808 extern PNG_EXPORT(void,png_set_filter
) PNGARG((png_structp png_ptr
, int method
,
1811 /* Flags for png_set_filter() to say which filters to use. The flags
1812 * are chosen so that they don't conflict with real filter types
1813 * below, in case they are supplied instead of the #defined constants.
1814 * These values should NOT be changed.
1816 #define PNG_NO_FILTERS 0x00
1817 #define PNG_FILTER_NONE 0x08
1818 #define PNG_FILTER_SUB 0x10
1819 #define PNG_FILTER_UP 0x20
1820 #define PNG_FILTER_AVG 0x40
1821 #define PNG_FILTER_PAETH 0x80
1822 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1823 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1825 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1826 * These defines should NOT be changed.
1828 #define PNG_FILTER_VALUE_NONE 0
1829 #define PNG_FILTER_VALUE_SUB 1
1830 #define PNG_FILTER_VALUE_UP 2
1831 #define PNG_FILTER_VALUE_AVG 3
1832 #define PNG_FILTER_VALUE_PAETH 4
1833 #define PNG_FILTER_VALUE_LAST 5
1835 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1836 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1837 * defines, either the default (minimum-sum-of-absolute-differences), or
1838 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1840 * Weights are factors >= 1.0, indicating how important it is to keep the
1841 * filter type consistent between rows. Larger numbers mean the current
1842 * filter is that many times as likely to be the same as the "num_weights"
1843 * previous filters. This is cumulative for each previous row with a weight.
1844 * There needs to be "num_weights" values in "filter_weights", or it can be
1845 * NULL if the weights aren't being specified. Weights have no influence on
1846 * the selection of the first row filter. Well chosen weights can (in theory)
1847 * improve the compression for a given image.
1849 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1850 * filter type. Higher costs indicate more decoding expense, and are
1851 * therefore less likely to be selected over a filter with lower computational
1852 * costs. There needs to be a value in "filter_costs" for each valid filter
1853 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1854 * setting the costs. Costs try to improve the speed of decompression without
1855 * unduly increasing the compressed image size.
1857 * A negative weight or cost indicates the default value is to be used, and
1858 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1859 * The default values for both weights and costs are currently 1.0, but may
1860 * change if good general weighting/cost heuristics can be found. If both
1861 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1862 * to the UNWEIGHTED method, but with added encoding time/computation.
1864 #ifdef PNG_FLOATING_POINT_SUPPORTED
1865 extern PNG_EXPORT(void,png_set_filter_heuristics
) PNGARG((png_structp png_ptr
,
1866 int heuristic_method
, int num_weights
, png_doublep filter_weights
,
1867 png_doublep filter_costs
));
1869 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1871 /* Heuristic used for row filter selection. These defines should NOT be
1874 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1875 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1876 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1877 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1879 /* Set the library compression level. Currently, valid values range from
1880 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1881 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1882 * shown that zlib compression levels 3-6 usually perform as well as level 9
1883 * for PNG images, and do considerably fewer caclulations. In the future,
1884 * these values may not correspond directly to the zlib compression levels.
1886 extern PNG_EXPORT(void,png_set_compression_level
) PNGARG((png_structp png_ptr
,
1889 extern PNG_EXPORT(void,png_set_compression_mem_level
)
1890 PNGARG((png_structp png_ptr
, int mem_level
));
1892 extern PNG_EXPORT(void,png_set_compression_strategy
)
1893 PNGARG((png_structp png_ptr
, int strategy
));
1895 extern PNG_EXPORT(void,png_set_compression_window_bits
)
1896 PNGARG((png_structp png_ptr
, int window_bits
));
1898 extern PNG_EXPORT(void,png_set_compression_method
) PNGARG((png_structp png_ptr
,
1901 /* These next functions are called for input/output, memory, and error
1902 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1903 * and call standard C I/O routines such as fread(), fwrite(), and
1904 * fprintf(). These functions can be made to use other I/O routines
1905 * at run time for those applications that need to handle I/O in a
1906 * different manner by calling png_set_???_fn(). See libpng.txt for
1910 #if !defined(PNG_NO_STDIO)
1911 /* Initialize the input/output for the PNG file to the default functions. */
1912 extern PNG_EXPORT(void,png_init_io
) PNGARG((png_structp png_ptr
, png_FILE_p fp
));
1915 /* Replace the (error and abort), and warning functions with user
1916 * supplied functions. If no messages are to be printed you must still
1917 * write and use replacement functions. The replacement error_fn should
1918 * still do a longjmp to the last setjmp location if you are using this
1919 * method of error handling. If error_fn or warning_fn is NULL, the
1920 * default function will be used.
1923 extern PNG_EXPORT(void,png_set_error_fn
) PNGARG((png_structp png_ptr
,
1924 png_voidp error_ptr
, png_error_ptr error_fn
, png_error_ptr warning_fn
));
1926 /* Return the user pointer associated with the error functions */
1927 extern PNG_EXPORT(png_voidp
,png_get_error_ptr
) PNGARG((png_structp png_ptr
));
1929 /* Replace the default data output functions with a user supplied one(s).
1930 * If buffered output is not used, then output_flush_fn can be set to NULL.
1931 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1932 * output_flush_fn will be ignored (and thus can be NULL).
1934 extern PNG_EXPORT(void,png_set_write_fn
) PNGARG((png_structp png_ptr
,
1935 png_voidp io_ptr
, png_rw_ptr write_data_fn
, png_flush_ptr output_flush_fn
));
1937 /* Replace the default data input function with a user supplied one. */
1938 extern PNG_EXPORT(void,png_set_read_fn
) PNGARG((png_structp png_ptr
,
1939 png_voidp io_ptr
, png_rw_ptr read_data_fn
));
1941 /* Return the user pointer associated with the I/O functions */
1942 extern PNG_EXPORT(png_voidp
,png_get_io_ptr
) PNGARG((png_structp png_ptr
));
1944 extern PNG_EXPORT(void,png_set_read_status_fn
) PNGARG((png_structp png_ptr
,
1945 png_read_status_ptr read_row_fn
));
1947 extern PNG_EXPORT(void,png_set_write_status_fn
) PNGARG((png_structp png_ptr
,
1948 png_write_status_ptr write_row_fn
));
1950 #ifdef PNG_USER_MEM_SUPPORTED
1951 /* Replace the default memory allocation functions with user supplied one(s). */
1952 extern PNG_EXPORT(void,png_set_mem_fn
) PNGARG((png_structp png_ptr
,
1953 png_voidp mem_ptr
, png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1954 /* Return the user pointer associated with the memory functions */
1955 extern PNG_EXPORT(png_voidp
,png_get_mem_ptr
) PNGARG((png_structp png_ptr
));
1958 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1959 defined(PNG_LEGACY_SUPPORTED)
1960 extern PNG_EXPORT(void,png_set_read_user_transform_fn
) PNGARG((png_structp
1961 png_ptr
, png_user_transform_ptr read_user_transform_fn
));
1964 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1965 defined(PNG_LEGACY_SUPPORTED)
1966 extern PNG_EXPORT(void,png_set_write_user_transform_fn
) PNGARG((png_structp
1967 png_ptr
, png_user_transform_ptr write_user_transform_fn
));
1970 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1971 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1972 defined(PNG_LEGACY_SUPPORTED)
1973 extern PNG_EXPORT(void,png_set_user_transform_info
) PNGARG((png_structp
1974 png_ptr
, png_voidp user_transform_ptr
, int user_transform_depth
,
1975 int user_transform_channels
));
1976 /* Return the user pointer associated with the user transform functions */
1977 extern PNG_EXPORT(png_voidp
,png_get_user_transform_ptr
)
1978 PNGARG((png_structp png_ptr
));
1981 #ifdef PNG_USER_CHUNKS_SUPPORTED
1982 extern PNG_EXPORT(void,png_set_read_user_chunk_fn
) PNGARG((png_structp png_ptr
,
1983 png_voidp user_chunk_ptr
, png_user_chunk_ptr read_user_chunk_fn
));
1984 extern PNG_EXPORT(png_voidp
,png_get_user_chunk_ptr
) PNGARG((png_structp
1988 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1989 /* Sets the function callbacks for the push reader, and a pointer to a
1990 * user-defined structure available to the callback functions.
1992 extern PNG_EXPORT(void,png_set_progressive_read_fn
) PNGARG((png_structp png_ptr
,
1993 png_voidp progressive_ptr
,
1994 png_progressive_info_ptr info_fn
, png_progressive_row_ptr row_fn
,
1995 png_progressive_end_ptr end_fn
));
1997 /* returns the user pointer associated with the push read functions */
1998 extern PNG_EXPORT(png_voidp
,png_get_progressive_ptr
)
1999 PNGARG((png_structp png_ptr
));
2001 /* function to be called when data becomes available */
2002 extern PNG_EXPORT(void,png_process_data
) PNGARG((png_structp png_ptr
,
2003 png_infop info_ptr
, png_bytep buffer
, png_size_t buffer_size
));
2005 /* function that combines rows. Not very much different than the
2006 * png_combine_row() call. Is this even used?????
2008 extern PNG_EXPORT(void,png_progressive_combine_row
) PNGARG((png_structp png_ptr
,
2009 png_bytep old_row
, png_bytep new_row
));
2010 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2012 extern PNG_EXPORT(png_voidp
,png_malloc
) PNGARG((png_structp png_ptr
,
2015 #if defined(PNG_1_0_X)
2016 # define png_malloc_warn png_malloc
2018 /* Added at libpng version 1.2.4 */
2019 extern PNG_EXPORT(png_voidp
,png_malloc_warn
) PNGARG((png_structp png_ptr
,
2023 /* frees a pointer allocated by png_malloc() */
2024 extern PNG_EXPORT(void,png_free
) PNGARG((png_structp png_ptr
, png_voidp ptr
));
2026 #if defined(PNG_1_0_X)
2027 /* Function to allocate memory for zlib. */
2028 extern PNG_EXPORT(voidpf
,png_zalloc
) PNGARG((voidpf png_ptr
, uInt items
,
2031 /* Function to free memory for zlib */
2032 extern PNG_EXPORT(void,png_zfree
) PNGARG((voidpf png_ptr
, voidpf ptr
));
2035 /* Free data that was allocated internally */
2036 extern PNG_EXPORT(void,png_free_data
) PNGARG((png_structp png_ptr
,
2037 png_infop info_ptr
, png_uint_32 free_me
, int num
));
2038 #ifdef PNG_FREE_ME_SUPPORTED
2039 /* Reassign responsibility for freeing existing data, whether allocated
2040 * by libpng or by the application */
2041 extern PNG_EXPORT(void,png_data_freer
) PNGARG((png_structp png_ptr
,
2042 png_infop info_ptr
, int freer
, png_uint_32 mask
));
2044 /* assignments for png_data_freer */
2045 #define PNG_DESTROY_WILL_FREE_DATA 1
2046 #define PNG_SET_WILL_FREE_DATA 1
2047 #define PNG_USER_WILL_FREE_DATA 2
2048 /* Flags for png_ptr->free_me and info_ptr->free_me */
2049 #define PNG_FREE_HIST 0x0008
2050 #define PNG_FREE_ICCP 0x0010
2051 #define PNG_FREE_SPLT 0x0020
2052 #define PNG_FREE_ROWS 0x0040
2053 #define PNG_FREE_PCAL 0x0080
2054 #define PNG_FREE_SCAL 0x0100
2055 #define PNG_FREE_UNKN 0x0200
2056 #define PNG_FREE_LIST 0x0400
2057 #define PNG_FREE_PLTE 0x1000
2058 #define PNG_FREE_TRNS 0x2000
2059 #define PNG_FREE_TEXT 0x4000
2060 #define PNG_FREE_ALL 0x7fff
2061 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2063 #ifdef PNG_USER_MEM_SUPPORTED
2064 extern PNG_EXPORT(png_voidp
,png_malloc_default
) PNGARG((png_structp png_ptr
,
2066 extern PNG_EXPORT(void,png_free_default
) PNGARG((png_structp png_ptr
,
2070 extern PNG_EXPORT(png_voidp
,png_memcpy_check
) PNGARG((png_structp png_ptr
,
2071 png_voidp s1
, png_voidp s2
, png_uint_32 size
));
2073 extern PNG_EXPORT(png_voidp
,png_memset_check
) PNGARG((png_structp png_ptr
,
2074 png_voidp s1
, int value
, png_uint_32 size
));
2076 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2077 extern void *png_far_to_near
PNGARG((png_structp png_ptr
,png_voidp ptr
,
2079 #endif /* USE_FAR_KEYWORD */
2081 #ifndef PNG_NO_ERROR_TEXT
2082 /* Fatal error in PNG image of libpng - can't continue */
2083 extern PNG_EXPORT(void,png_error
) PNGARG((png_structp png_ptr
,
2084 png_const_charp error_message
));
2086 /* The same, but the chunk name is prepended to the error string. */
2087 extern PNG_EXPORT(void,png_chunk_error
) PNGARG((png_structp png_ptr
,
2088 png_const_charp error_message
));
2090 /* Fatal error in PNG image of libpng - can't continue */
2091 extern PNG_EXPORT(void,png_err
) PNGARG((png_structp png_ptr
));
2094 #ifndef PNG_NO_WARNINGS
2095 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2096 extern PNG_EXPORT(void,png_warning
) PNGARG((png_structp png_ptr
,
2097 png_const_charp warning_message
));
2099 #ifdef PNG_READ_SUPPORTED
2100 /* Non-fatal error in libpng, chunk name is prepended to message. */
2101 extern PNG_EXPORT(void,png_chunk_warning
) PNGARG((png_structp png_ptr
,
2102 png_const_charp warning_message
));
2103 #endif /* PNG_READ_SUPPORTED */
2104 #endif /* PNG_NO_WARNINGS */
2106 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2107 * Similarly, the png_get_<chunk> calls are used to read values from the
2108 * png_info_struct, either storing the parameters in the passed variables, or
2109 * setting pointers into the png_info_struct where the data is stored. The
2110 * png_get_<chunk> functions return a non-zero value if the data was available
2111 * in info_ptr, or return zero and do not change any of the parameters if the
2112 * data was not available.
2114 * These functions should be used instead of directly accessing png_info
2115 * to avoid problems with future changes in the size and internal layout of
2118 /* Returns "flag" if chunk data is valid in info_ptr. */
2119 extern PNG_EXPORT(png_uint_32
,png_get_valid
) PNGARG((png_structp png_ptr
,
2120 png_infop info_ptr
, png_uint_32 flag
));
2122 /* Returns number of bytes needed to hold a transformed row. */
2123 extern PNG_EXPORT(png_uint_32
,png_get_rowbytes
) PNGARG((png_structp png_ptr
,
2124 png_infop info_ptr
));
2126 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2127 /* Returns row_pointers, which is an array of pointers to scanlines that was
2128 returned from png_read_png(). */
2129 extern PNG_EXPORT(png_bytepp
,png_get_rows
) PNGARG((png_structp png_ptr
,
2130 png_infop info_ptr
));
2131 /* Set row_pointers, which is an array of pointers to scanlines for use
2132 by png_write_png(). */
2133 extern PNG_EXPORT(void,png_set_rows
) PNGARG((png_structp png_ptr
,
2134 png_infop info_ptr
, png_bytepp row_pointers
));
2137 /* Returns number of color channels in image. */
2138 extern PNG_EXPORT(png_byte
,png_get_channels
) PNGARG((png_structp png_ptr
,
2139 png_infop info_ptr
));
2141 #ifdef PNG_EASY_ACCESS_SUPPORTED
2142 /* Returns image width in pixels. */
2143 extern PNG_EXPORT(png_uint_32
, png_get_image_width
) PNGARG((png_structp
2144 png_ptr
, png_infop info_ptr
));
2146 /* Returns image height in pixels. */
2147 extern PNG_EXPORT(png_uint_32
, png_get_image_height
) PNGARG((png_structp
2148 png_ptr
, png_infop info_ptr
));
2150 /* Returns image bit_depth. */
2151 extern PNG_EXPORT(png_byte
, png_get_bit_depth
) PNGARG((png_structp
2152 png_ptr
, png_infop info_ptr
));
2154 /* Returns image color_type. */
2155 extern PNG_EXPORT(png_byte
, png_get_color_type
) PNGARG((png_structp
2156 png_ptr
, png_infop info_ptr
));
2158 /* Returns image filter_type. */
2159 extern PNG_EXPORT(png_byte
, png_get_filter_type
) PNGARG((png_structp
2160 png_ptr
, png_infop info_ptr
));
2162 /* Returns image interlace_type. */
2163 extern PNG_EXPORT(png_byte
, png_get_interlace_type
) PNGARG((png_structp
2164 png_ptr
, png_infop info_ptr
));
2166 /* Returns image compression_type. */
2167 extern PNG_EXPORT(png_byte
, png_get_compression_type
) PNGARG((png_structp
2168 png_ptr
, png_infop info_ptr
));
2170 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2171 extern PNG_EXPORT(png_uint_32
, png_get_pixels_per_meter
) PNGARG((png_structp
2172 png_ptr
, png_infop info_ptr
));
2173 extern PNG_EXPORT(png_uint_32
, png_get_x_pixels_per_meter
) PNGARG((png_structp
2174 png_ptr
, png_infop info_ptr
));
2175 extern PNG_EXPORT(png_uint_32
, png_get_y_pixels_per_meter
) PNGARG((png_structp
2176 png_ptr
, png_infop info_ptr
));
2178 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2179 #ifdef PNG_FLOATING_POINT_SUPPORTED
2180 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio
) PNGARG((png_structp
2181 png_ptr
, png_infop info_ptr
));
2184 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2185 extern PNG_EXPORT(png_int_32
, png_get_x_offset_pixels
) PNGARG((png_structp
2186 png_ptr
, png_infop info_ptr
));
2187 extern PNG_EXPORT(png_int_32
, png_get_y_offset_pixels
) PNGARG((png_structp
2188 png_ptr
, png_infop info_ptr
));
2189 extern PNG_EXPORT(png_int_32
, png_get_x_offset_microns
) PNGARG((png_structp
2190 png_ptr
, png_infop info_ptr
));
2191 extern PNG_EXPORT(png_int_32
, png_get_y_offset_microns
) PNGARG((png_structp
2192 png_ptr
, png_infop info_ptr
));
2194 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2196 /* Returns pointer to signature string read from PNG header */
2197 extern PNG_EXPORT(png_bytep
,png_get_signature
) PNGARG((png_structp png_ptr
,
2198 png_infop info_ptr
));
2200 #if defined(PNG_bKGD_SUPPORTED)
2201 extern PNG_EXPORT(png_uint_32
,png_get_bKGD
) PNGARG((png_structp png_ptr
,
2202 png_infop info_ptr
, png_color_16p
*background
));
2205 #if defined(PNG_bKGD_SUPPORTED)
2206 extern PNG_EXPORT(void,png_set_bKGD
) PNGARG((png_structp png_ptr
,
2207 png_infop info_ptr
, png_color_16p background
));
2210 #if defined(PNG_cHRM_SUPPORTED)
2211 #ifdef PNG_FLOATING_POINT_SUPPORTED
2212 extern PNG_EXPORT(png_uint_32
,png_get_cHRM
) PNGARG((png_structp png_ptr
,
2213 png_infop info_ptr
, double *white_x
, double *white_y
, double *red_x
,
2214 double *red_y
, double *green_x
, double *green_y
, double *blue_x
,
2217 #ifdef PNG_FIXED_POINT_SUPPORTED
2218 extern PNG_EXPORT(png_uint_32
,png_get_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2219 png_infop info_ptr
, png_fixed_point
*int_white_x
, png_fixed_point
2220 *int_white_y
, png_fixed_point
*int_red_x
, png_fixed_point
*int_red_y
,
2221 png_fixed_point
*int_green_x
, png_fixed_point
*int_green_y
, png_fixed_point
2222 *int_blue_x
, png_fixed_point
*int_blue_y
));
2226 #if defined(PNG_cHRM_SUPPORTED)
2227 #ifdef PNG_FLOATING_POINT_SUPPORTED
2228 extern PNG_EXPORT(void,png_set_cHRM
) PNGARG((png_structp png_ptr
,
2229 png_infop info_ptr
, double white_x
, double white_y
, double red_x
,
2230 double red_y
, double green_x
, double green_y
, double blue_x
, double blue_y
));
2232 #ifdef PNG_FIXED_POINT_SUPPORTED
2233 extern PNG_EXPORT(void,png_set_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2234 png_infop info_ptr
, png_fixed_point int_white_x
, png_fixed_point int_white_y
,
2235 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
2236 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
2237 png_fixed_point int_blue_y
));
2241 #if defined(PNG_gAMA_SUPPORTED)
2242 #ifdef PNG_FLOATING_POINT_SUPPORTED
2243 extern PNG_EXPORT(png_uint_32
,png_get_gAMA
) PNGARG((png_structp png_ptr
,
2244 png_infop info_ptr
, double *file_gamma
));
2246 extern PNG_EXPORT(png_uint_32
,png_get_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2247 png_infop info_ptr
, png_fixed_point
*int_file_gamma
));
2250 #if defined(PNG_gAMA_SUPPORTED)
2251 #ifdef PNG_FLOATING_POINT_SUPPORTED
2252 extern PNG_EXPORT(void,png_set_gAMA
) PNGARG((png_structp png_ptr
,
2253 png_infop info_ptr
, double file_gamma
));
2255 extern PNG_EXPORT(void,png_set_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2256 png_infop info_ptr
, png_fixed_point int_file_gamma
));
2259 #if defined(PNG_hIST_SUPPORTED)
2260 extern PNG_EXPORT(png_uint_32
,png_get_hIST
) PNGARG((png_structp png_ptr
,
2261 png_infop info_ptr
, png_uint_16p
*hist
));
2264 #if defined(PNG_hIST_SUPPORTED)
2265 extern PNG_EXPORT(void,png_set_hIST
) PNGARG((png_structp png_ptr
,
2266 png_infop info_ptr
, png_uint_16p hist
));
2269 extern PNG_EXPORT(png_uint_32
,png_get_IHDR
) PNGARG((png_structp png_ptr
,
2270 png_infop info_ptr
, png_uint_32
*width
, png_uint_32
*height
,
2271 int *bit_depth
, int *color_type
, int *interlace_method
,
2272 int *compression_method
, int *filter_method
));
2274 extern PNG_EXPORT(void,png_set_IHDR
) PNGARG((png_structp png_ptr
,
2275 png_infop info_ptr
, png_uint_32 width
, png_uint_32 height
, int bit_depth
,
2276 int color_type
, int interlace_method
, int compression_method
,
2277 int filter_method
));
2279 #if defined(PNG_oFFs_SUPPORTED)
2280 extern PNG_EXPORT(png_uint_32
,png_get_oFFs
) PNGARG((png_structp png_ptr
,
2281 png_infop info_ptr
, png_int_32
*offset_x
, png_int_32
*offset_y
,
2285 #if defined(PNG_oFFs_SUPPORTED)
2286 extern PNG_EXPORT(void,png_set_oFFs
) PNGARG((png_structp png_ptr
,
2287 png_infop info_ptr
, png_int_32 offset_x
, png_int_32 offset_y
,
2291 #if defined(PNG_pCAL_SUPPORTED)
2292 extern PNG_EXPORT(png_uint_32
,png_get_pCAL
) PNGARG((png_structp png_ptr
,
2293 png_infop info_ptr
, png_charp
*purpose
, png_int_32
*X0
, png_int_32
*X1
,
2294 int *type
, int *nparams
, png_charp
*units
, png_charpp
*params
));
2297 #if defined(PNG_pCAL_SUPPORTED)
2298 extern PNG_EXPORT(void,png_set_pCAL
) PNGARG((png_structp png_ptr
,
2299 png_infop info_ptr
, png_charp purpose
, png_int_32 X0
, png_int_32 X1
,
2300 int type
, int nparams
, png_charp units
, png_charpp params
));
2303 #if defined(PNG_pHYs_SUPPORTED)
2304 extern PNG_EXPORT(png_uint_32
,png_get_pHYs
) PNGARG((png_structp png_ptr
,
2305 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
2308 #if defined(PNG_pHYs_SUPPORTED)
2309 extern PNG_EXPORT(void,png_set_pHYs
) PNGARG((png_structp png_ptr
,
2310 png_infop info_ptr
, png_uint_32 res_x
, png_uint_32 res_y
, int unit_type
));
2313 extern PNG_EXPORT(png_uint_32
,png_get_PLTE
) PNGARG((png_structp png_ptr
,
2314 png_infop info_ptr
, png_colorp
*palette
, int *num_palette
));
2316 extern PNG_EXPORT(void,png_set_PLTE
) PNGARG((png_structp png_ptr
,
2317 png_infop info_ptr
, png_colorp palette
, int num_palette
));
2319 #if defined(PNG_sBIT_SUPPORTED)
2320 extern PNG_EXPORT(png_uint_32
,png_get_sBIT
) PNGARG((png_structp png_ptr
,
2321 png_infop info_ptr
, png_color_8p
*sig_bit
));
2324 #if defined(PNG_sBIT_SUPPORTED)
2325 extern PNG_EXPORT(void,png_set_sBIT
) PNGARG((png_structp png_ptr
,
2326 png_infop info_ptr
, png_color_8p sig_bit
));
2329 #if defined(PNG_sRGB_SUPPORTED)
2330 extern PNG_EXPORT(png_uint_32
,png_get_sRGB
) PNGARG((png_structp png_ptr
,
2331 png_infop info_ptr
, int *intent
));
2334 #if defined(PNG_sRGB_SUPPORTED)
2335 extern PNG_EXPORT(void,png_set_sRGB
) PNGARG((png_structp png_ptr
,
2336 png_infop info_ptr
, int intent
));
2337 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM
) PNGARG((png_structp png_ptr
,
2338 png_infop info_ptr
, int intent
));
2341 #if defined(PNG_iCCP_SUPPORTED)
2342 extern PNG_EXPORT(png_uint_32
,png_get_iCCP
) PNGARG((png_structp png_ptr
,
2343 png_infop info_ptr
, png_charpp name
, int *compression_type
,
2344 png_charpp profile
, png_uint_32
*proflen
));
2345 /* Note to maintainer: profile should be png_bytepp */
2348 #if defined(PNG_iCCP_SUPPORTED)
2349 extern PNG_EXPORT(void,png_set_iCCP
) PNGARG((png_structp png_ptr
,
2350 png_infop info_ptr
, png_charp name
, int compression_type
,
2351 png_charp profile
, png_uint_32 proflen
));
2352 /* Note to maintainer: profile should be png_bytep */
2355 #if defined(PNG_sPLT_SUPPORTED)
2356 extern PNG_EXPORT(png_uint_32
,png_get_sPLT
) PNGARG((png_structp png_ptr
,
2357 png_infop info_ptr
, png_sPLT_tpp entries
));
2360 #if defined(PNG_sPLT_SUPPORTED)
2361 extern PNG_EXPORT(void,png_set_sPLT
) PNGARG((png_structp png_ptr
,
2362 png_infop info_ptr
, png_sPLT_tp entries
, int nentries
));
2365 #if defined(PNG_TEXT_SUPPORTED)
2366 /* png_get_text also returns the number of text chunks in *num_text */
2367 extern PNG_EXPORT(png_uint_32
,png_get_text
) PNGARG((png_structp png_ptr
,
2368 png_infop info_ptr
, png_textp
*text_ptr
, int *num_text
));
2372 * Note while png_set_text() will accept a structure whose text,
2373 * language, and translated keywords are NULL pointers, the structure
2374 * returned by png_get_text will always contain regular
2375 * zero-terminated C strings. They might be empty strings but
2376 * they will never be NULL pointers.
2379 #if defined(PNG_TEXT_SUPPORTED)
2380 extern PNG_EXPORT(void,png_set_text
) PNGARG((png_structp png_ptr
,
2381 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
2384 #if defined(PNG_tIME_SUPPORTED)
2385 extern PNG_EXPORT(png_uint_32
,png_get_tIME
) PNGARG((png_structp png_ptr
,
2386 png_infop info_ptr
, png_timep
*mod_time
));
2389 #if defined(PNG_tIME_SUPPORTED)
2390 extern PNG_EXPORT(void,png_set_tIME
) PNGARG((png_structp png_ptr
,
2391 png_infop info_ptr
, png_timep mod_time
));
2394 #if defined(PNG_tRNS_SUPPORTED)
2395 extern PNG_EXPORT(png_uint_32
,png_get_tRNS
) PNGARG((png_structp png_ptr
,
2396 png_infop info_ptr
, png_bytep
*trans
, int *num_trans
,
2397 png_color_16p
*trans_values
));
2400 #if defined(PNG_tRNS_SUPPORTED)
2401 extern PNG_EXPORT(void,png_set_tRNS
) PNGARG((png_structp png_ptr
,
2402 png_infop info_ptr
, png_bytep trans
, int num_trans
,
2403 png_color_16p trans_values
));
2406 #if defined(PNG_tRNS_SUPPORTED)
2409 #if defined(PNG_sCAL_SUPPORTED)
2410 #ifdef PNG_FLOATING_POINT_SUPPORTED
2411 extern PNG_EXPORT(png_uint_32
,png_get_sCAL
) PNGARG((png_structp png_ptr
,
2412 png_infop info_ptr
, int *unit
, double *width
, double *height
));
2414 #ifdef PNG_FIXED_POINT_SUPPORTED
2415 extern PNG_EXPORT(png_uint_32
,png_get_sCAL_s
) PNGARG((png_structp png_ptr
,
2416 png_infop info_ptr
, int *unit
, png_charpp swidth
, png_charpp sheight
));
2419 #endif /* PNG_sCAL_SUPPORTED */
2421 #if defined(PNG_sCAL_SUPPORTED)
2422 #ifdef PNG_FLOATING_POINT_SUPPORTED
2423 extern PNG_EXPORT(void,png_set_sCAL
) PNGARG((png_structp png_ptr
,
2424 png_infop info_ptr
, int unit
, double width
, double height
));
2426 #ifdef PNG_FIXED_POINT_SUPPORTED
2427 extern PNG_EXPORT(void,png_set_sCAL_s
) PNGARG((png_structp png_ptr
,
2428 png_infop info_ptr
, int unit
, png_charp swidth
, png_charp sheight
));
2431 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2433 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2434 /* provide a list of chunks and how they are to be handled, if the built-in
2435 handling or default unknown chunk handling is not desired. Any chunks not
2436 listed will be handled in the default manner. The IHDR and IEND chunks
2438 keep = 0: follow default behaviour
2440 = 2: keep only if safe-to-copy
2441 = 3: keep even if unsafe-to-copy
2443 extern PNG_EXPORT(void, png_set_keep_unknown_chunks
) PNGARG((png_structp
2444 png_ptr
, int keep
, png_bytep chunk_list
, int num_chunks
));
2445 extern PNG_EXPORT(void, png_set_unknown_chunks
) PNGARG((png_structp png_ptr
,
2446 png_infop info_ptr
, png_unknown_chunkp unknowns
, int num_unknowns
));
2447 extern PNG_EXPORT(void, png_set_unknown_chunk_location
)
2448 PNGARG((png_structp png_ptr
, png_infop info_ptr
, int chunk
, int location
));
2449 extern PNG_EXPORT(png_uint_32
,png_get_unknown_chunks
) PNGARG((png_structp
2450 png_ptr
, png_infop info_ptr
, png_unknown_chunkpp entries
));
2452 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2453 PNG_EXPORT(int,png_handle_as_unknown
) PNGARG((png_structp png_ptr
, png_bytep
2457 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2458 If you need to turn it off for a chunk that your application has freed,
2459 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2460 extern PNG_EXPORT(void, png_set_invalid
) PNGARG((png_structp png_ptr
,
2461 png_infop info_ptr
, int mask
));
2463 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2464 /* The "params" pointer is currently not used and is for future expansion. */
2465 extern PNG_EXPORT(void, png_read_png
) PNGARG((png_structp png_ptr
,
2469 extern PNG_EXPORT(void, png_write_png
) PNGARG((png_structp png_ptr
,
2475 /* Define PNG_DEBUG at compile time for debugging information. Higher
2476 * numbers for PNG_DEBUG mean more debugging information. This has
2477 * only been added since version 0.95 so it is not implemented throughout
2478 * libpng yet, but more support will be added as needed.
2482 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2485 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
2486 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2487 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2489 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2490 #ifndef PNG_DEBUG_FILE
2491 #define PNG_DEBUG_FILE stderr
2492 #endif /* PNG_DEBUG_FILE */
2494 #define png_debug(l,m) \
2497 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2498 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2500 #define png_debug1(l,m,p1) \
2503 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2504 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2506 #define png_debug2(l,m,p1,p2) \
2509 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2510 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2512 #endif /* (PNG_DEBUG > 1) */
2513 #endif /* _MSC_VER */
2514 #endif /* (PNG_DEBUG > 0) */
2515 #endif /* PNG_DEBUG */
2517 #define png_debug(l, m)
2520 #define png_debug1(l, m, p1)
2523 #define png_debug2(l, m, p1, p2)
2526 extern PNG_EXPORT(png_charp
,png_get_copyright
) PNGARG((png_structp png_ptr
));
2527 extern PNG_EXPORT(png_charp
,png_get_header_ver
) PNGARG((png_structp png_ptr
));
2528 extern PNG_EXPORT(png_charp
,png_get_header_version
) PNGARG((png_structp png_ptr
));
2529 extern PNG_EXPORT(png_charp
,png_get_libpng_ver
) PNGARG((png_structp png_ptr
));
2531 #ifdef PNG_MNG_FEATURES_SUPPORTED
2532 extern PNG_EXPORT(png_uint_32
,png_permit_mng_features
) PNGARG((png_structp
2533 png_ptr
, png_uint_32 mng_features_permitted
));
2536 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2537 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2538 #define PNG_HANDLE_CHUNK_NEVER 1
2539 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2540 #define PNG_HANDLE_CHUNK_ALWAYS 3
2542 /* Added to version 1.2.0 */
2543 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2544 #if defined(PNG_MMX_CODE_SUPPORTED)
2545 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2546 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2547 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2548 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2549 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2550 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2551 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2552 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2553 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2555 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2556 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2557 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2558 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2559 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2560 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2561 #define PNG_MMX_WRITE_FLAGS ( 0 )
2563 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2564 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2565 | PNG_MMX_READ_FLAGS \
2566 | PNG_MMX_WRITE_FLAGS )
2568 #define PNG_SELECT_READ 1
2569 #define PNG_SELECT_WRITE 2
2570 #endif /* PNG_MMX_CODE_SUPPORTED */
2572 #if !defined(PNG_1_0_X)
2574 extern PNG_EXPORT(png_uint_32
,png_get_mmx_flagmask
)
2575 PNGARG((int flag_select
, int *compilerID
));
2578 extern PNG_EXPORT(png_uint_32
,png_get_asm_flagmask
)
2579 PNGARG((int flag_select
));
2582 extern PNG_EXPORT(png_uint_32
,png_get_asm_flags
)
2583 PNGARG((png_structp png_ptr
));
2586 extern PNG_EXPORT(png_byte
,png_get_mmx_bitdepth_threshold
)
2587 PNGARG((png_structp png_ptr
));
2590 extern PNG_EXPORT(png_uint_32
,png_get_mmx_rowbytes_threshold
)
2591 PNGARG((png_structp png_ptr
));
2594 extern PNG_EXPORT(void,png_set_asm_flags
)
2595 PNGARG((png_structp png_ptr
, png_uint_32 asm_flags
));
2598 extern PNG_EXPORT(void,png_set_mmx_thresholds
)
2599 PNGARG((png_structp png_ptr
, png_byte mmx_bitdepth_threshold
,
2600 png_uint_32 mmx_rowbytes_threshold
));
2602 #endif /* PNG_1_0_X */
2604 #if !defined(PNG_1_0_X)
2605 /* png.c, pnggccrd.c, or pngvcrd.c */
2606 extern PNG_EXPORT(int,png_mmx_support
) PNGARG((void));
2607 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2609 /* Strip the prepended error numbers ("#nnn ") from error and warning
2610 * messages before passing them to the error or warning handler. */
2611 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2612 extern PNG_EXPORT(void,png_set_strip_error_numbers
) PNGARG((png_structp
2613 png_ptr
, png_uint_32 strip_mode
));
2616 #endif /* PNG_1_0_X */
2618 /* Added at libpng-1.2.6 */
2619 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2620 extern PNG_EXPORT(void,png_set_user_limits
) PNGARG((png_structp
2621 png_ptr
, png_uint_32 user_width_max
, png_uint_32 user_height_max
));
2622 extern PNG_EXPORT(png_uint_32
,png_get_user_width_max
) PNGARG((png_structp
2624 extern PNG_EXPORT(png_uint_32
,png_get_user_height_max
) PNGARG((png_structp
2628 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2630 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2631 /* With these routines we avoid an integer divide, which will be slower on
2632 * most machines. However, it does take more operations than the corresponding
2633 * divide method, so it may be slower on a few RISC systems. There are two
2634 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2636 * Note that the rounding factors are NOT supposed to be the same! 128 and
2637 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2640 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2643 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2645 # define png_composite(composite, fg, alpha, bg) \
2646 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2647 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2648 (png_uint_16)(alpha)) + (png_uint_16)128); \
2649 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2651 # define png_composite_16(composite, fg, alpha, bg) \
2652 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2653 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2654 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2655 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2657 #else /* standard method using integer division */
2659 # define png_composite(composite, fg, alpha, bg) \
2660 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2661 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2662 (png_uint_16)127) / 255)
2664 # define png_composite_16(composite, fg, alpha, bg) \
2665 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2666 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2667 (png_uint_32)32767) / (png_uint_32)65535L)
2669 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2671 /* Inline macros to do direct reads of bytes from the input buffer. These
2672 * require that you are using an architecture that uses PNG byte ordering
2673 * (MSB first) and supports unaligned data storage. I think that PowerPC
2674 * in big-endian mode and 680x0 are the only ones that will support this.
2675 * The x86 line of processors definitely do not. The png_get_int_32()
2676 * routine also assumes we are using two's complement format for negative
2677 * values, which is almost certainly true.
2679 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2680 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2681 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2682 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2684 extern PNG_EXPORT(png_uint_32
,png_get_uint_32
) PNGARG((png_bytep buf
));
2685 extern PNG_EXPORT(png_uint_16
,png_get_uint_16
) PNGARG((png_bytep buf
));
2686 extern PNG_EXPORT(png_int_32
,png_get_int_32
) PNGARG((png_bytep buf
));
2687 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2688 extern PNG_EXPORT(png_uint_32
,png_get_uint_31
)
2689 PNGARG((png_structp png_ptr
, png_bytep buf
));
2690 /* No png_get_int_16 -- may be added if there's a real need for it. */
2692 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2694 extern PNG_EXPORT(void,png_save_uint_32
)
2695 PNGARG((png_bytep buf
, png_uint_32 i
));
2696 extern PNG_EXPORT(void,png_save_int_32
)
2697 PNGARG((png_bytep buf
, png_int_32 i
));
2699 /* Place a 16-bit number into a buffer in PNG byte order.
2700 * The parameter is declared unsigned int, not png_uint_16,
2701 * just to avoid potential problems on pre-ANSI C compilers.
2703 extern PNG_EXPORT(void,png_save_uint_16
)
2704 PNGARG((png_bytep buf
, unsigned int i
));
2705 /* No png_save_int_16 -- may be added if there's a real need for it. */
2707 /* ************************************************************************* */
2709 /* These next functions are used internally in the code. They generally
2710 * shouldn't be used unless you are writing code to add or replace some
2711 * functionality in libpng. More information about most functions can
2712 * be found in the files where the functions are located.
2716 /* Various modes of operation, that are visible to applications because
2717 * they are used for unknown chunk location.
2719 #define PNG_HAVE_IHDR 0x01
2720 #define PNG_HAVE_PLTE 0x02
2721 #define PNG_HAVE_IDAT 0x04
2722 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2723 #define PNG_HAVE_IEND 0x10
2725 #if defined(PNG_INTERNAL)
2727 /* More modes of operation. Note that after an init, mode is set to
2728 * zero automatically when the structure is created.
2730 #define PNG_HAVE_gAMA 0x20
2731 #define PNG_HAVE_cHRM 0x40
2732 #define PNG_HAVE_sRGB 0x80
2733 #define PNG_HAVE_CHUNK_HEADER 0x100
2734 #define PNG_WROTE_tIME 0x200
2735 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2736 #define PNG_BACKGROUND_IS_GRAY 0x800
2737 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2738 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2740 /* flags for the transformations the PNG library does on the image data */
2741 #define PNG_BGR 0x0001
2742 #define PNG_INTERLACE 0x0002
2743 #define PNG_PACK 0x0004
2744 #define PNG_SHIFT 0x0008
2745 #define PNG_SWAP_BYTES 0x0010
2746 #define PNG_INVERT_MONO 0x0020
2747 #define PNG_DITHER 0x0040
2748 #define PNG_BACKGROUND 0x0080
2749 #define PNG_BACKGROUND_EXPAND 0x0100
2751 #define PNG_16_TO_8 0x0400
2752 #define PNG_RGBA 0x0800
2753 #define PNG_EXPAND 0x1000
2754 #define PNG_GAMMA 0x2000
2755 #define PNG_GRAY_TO_RGB 0x4000
2756 #define PNG_FILLER 0x8000L
2757 #define PNG_PACKSWAP 0x10000L
2758 #define PNG_SWAP_ALPHA 0x20000L
2759 #define PNG_STRIP_ALPHA 0x40000L
2760 #define PNG_INVERT_ALPHA 0x80000L
2761 #define PNG_USER_TRANSFORM 0x100000L
2762 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2763 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2764 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2765 /* 0x800000L Unused */
2766 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2767 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2768 /* 0x4000000L unused */
2769 /* 0x8000000L unused */
2770 /* 0x10000000L unused */
2771 /* 0x20000000L unused */
2772 /* 0x40000000L unused */
2774 /* flags for png_create_struct */
2775 #define PNG_STRUCT_PNG 0x0001
2776 #define PNG_STRUCT_INFO 0x0002
2778 /* Scaling factor for filter heuristic weighting calculations */
2779 #define PNG_WEIGHT_SHIFT 8
2780 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2781 #define PNG_COST_SHIFT 3
2782 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2784 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2785 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2786 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2787 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2788 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2789 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2790 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2791 #define PNG_FLAG_ROW_INIT 0x0040
2792 #define PNG_FLAG_FILLER_AFTER 0x0080
2793 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2794 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2795 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2796 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2797 #define PNG_FLAG_FREE_PLTE 0x1000
2798 #define PNG_FLAG_FREE_TRNS 0x2000
2799 #define PNG_FLAG_FREE_HIST 0x4000
2800 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2801 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2802 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2803 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2804 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2805 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2806 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2807 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2808 /* 0x800000L unused */
2809 /* 0x1000000L unused */
2810 /* 0x2000000L unused */
2811 /* 0x4000000L unused */
2812 /* 0x8000000L unused */
2813 /* 0x10000000L unused */
2814 /* 0x20000000L unused */
2815 /* 0x40000000L unused */
2817 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2818 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2820 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2821 PNG_FLAG_CRC_CRITICAL_IGNORE)
2823 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2824 PNG_FLAG_CRC_CRITICAL_MASK)
2826 /* save typing and make code easier to understand */
2828 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2829 abs((int)((c1).green) - (int)((c2).green)) + \
2830 abs((int)((c1).blue) - (int)((c2).blue)))
2832 /* Added to libpng-1.2.6 JB */
2833 #define PNG_ROWBYTES(pixel_bits, width) \
2834 ((pixel_bits) >= 8 ? \
2835 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2836 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2838 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2839 ideal-delta..ideal+delta. Each argument is evaluated twice.
2840 "ideal" and "delta" should be constants, normally simple
2841 integers, "value" a variable. Added to libpng-1.2.6 JB */
2842 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2843 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2845 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2846 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2847 /* place to hold the signature string for a PNG file. */
2848 #ifdef PNG_USE_GLOBAL_ARRAYS
2849 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA
) png_sig
[8];
2852 #endif /* PNG_NO_EXTERN */
2854 /* Constant strings for known chunk types. If you need to add a chunk,
2855 * define the name here, and add an invocation of the macro in png.c and
2856 * wherever it's needed.
2858 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2859 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2860 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2861 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2862 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2863 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2864 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2865 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2866 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2867 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2868 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2869 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2870 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2871 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2872 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2873 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2874 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2875 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2876 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2877 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2878 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2880 #ifdef PNG_USE_GLOBAL_ARRAYS
2881 PNG_EXPORT_VAR (png_byte FARDATA
) png_IHDR
[5];
2882 PNG_EXPORT_VAR (png_byte FARDATA
) png_IDAT
[5];
2883 PNG_EXPORT_VAR (png_byte FARDATA
) png_IEND
[5];
2884 PNG_EXPORT_VAR (png_byte FARDATA
) png_PLTE
[5];
2885 PNG_EXPORT_VAR (png_byte FARDATA
) png_bKGD
[5];
2886 PNG_EXPORT_VAR (png_byte FARDATA
) png_cHRM
[5];
2887 PNG_EXPORT_VAR (png_byte FARDATA
) png_gAMA
[5];
2888 PNG_EXPORT_VAR (png_byte FARDATA
) png_hIST
[5];
2889 PNG_EXPORT_VAR (png_byte FARDATA
) png_iCCP
[5];
2890 PNG_EXPORT_VAR (png_byte FARDATA
) png_iTXt
[5];
2891 PNG_EXPORT_VAR (png_byte FARDATA
) png_oFFs
[5];
2892 PNG_EXPORT_VAR (png_byte FARDATA
) png_pCAL
[5];
2893 PNG_EXPORT_VAR (png_byte FARDATA
) png_sCAL
[5];
2894 PNG_EXPORT_VAR (png_byte FARDATA
) png_pHYs
[5];
2895 PNG_EXPORT_VAR (png_byte FARDATA
) png_sBIT
[5];
2896 PNG_EXPORT_VAR (png_byte FARDATA
) png_sPLT
[5];
2897 PNG_EXPORT_VAR (png_byte FARDATA
) png_sRGB
[5];
2898 PNG_EXPORT_VAR (png_byte FARDATA
) png_tEXt
[5];
2899 PNG_EXPORT_VAR (png_byte FARDATA
) png_tIME
[5];
2900 PNG_EXPORT_VAR (png_byte FARDATA
) png_tRNS
[5];
2901 PNG_EXPORT_VAR (png_byte FARDATA
) png_zTXt
[5];
2902 #endif /* PNG_USE_GLOBAL_ARRAYS */
2904 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2905 /* Initialize png_ptr struct for reading, and allocate any other memory.
2906 * (old interface - DEPRECATED - use png_create_read_struct instead).
2908 extern PNG_EXPORT(void,png_read_init
) PNGARG((png_structp png_ptr
));
2909 #undef png_read_init
2910 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2911 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2914 extern PNG_EXPORT(void,png_read_init_3
) PNGARG((png_structpp ptr_ptr
,
2915 png_const_charp user_png_ver
, png_size_t png_struct_size
));
2916 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2917 extern PNG_EXPORT(void,png_read_init_2
) PNGARG((png_structp png_ptr
,
2918 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
2922 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2923 /* Initialize png_ptr struct for writing, and allocate any other memory.
2924 * (old interface - DEPRECATED - use png_create_write_struct instead).
2926 extern PNG_EXPORT(void,png_write_init
) PNGARG((png_structp png_ptr
));
2927 #undef png_write_init
2928 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2929 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2932 extern PNG_EXPORT(void,png_write_init_3
) PNGARG((png_structpp ptr_ptr
,
2933 png_const_charp user_png_ver
, png_size_t png_struct_size
));
2934 extern PNG_EXPORT(void,png_write_init_2
) PNGARG((png_structp png_ptr
,
2935 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
2938 /* Allocate memory for an internal libpng struct */
2939 PNG_EXTERN png_voidp png_create_struct
PNGARG((int type
));
2941 /* Free memory from internal libpng struct */
2942 PNG_EXTERN
void png_destroy_struct
PNGARG((png_voidp struct_ptr
));
2944 PNG_EXTERN png_voidp png_create_struct_2
PNGARG((int type
, png_malloc_ptr
2945 malloc_fn
, png_voidp mem_ptr
));
2946 PNG_EXTERN
void png_destroy_struct_2
PNGARG((png_voidp struct_ptr
,
2947 png_free_ptr free_fn
, png_voidp mem_ptr
));
2949 /* Free any memory that info_ptr points to and reset struct. */
2950 PNG_EXTERN
void png_info_destroy
PNGARG((png_structp png_ptr
,
2951 png_infop info_ptr
));
2954 /* Function to allocate memory for zlib. */
2955 PNG_EXTERN voidpf png_zalloc
PNGARG((voidpf png_ptr
, uInt items
, uInt size
));
2957 /* Function to free memory for zlib */
2958 PNG_EXTERN
void png_zfree
PNGARG((voidpf png_ptr
, voidpf ptr
));
2961 /* Function to convert a sizeof an item to png_sizeof item */
2962 PNG_EXTERN png_size_t PNGAPI png_convert_size
PNGARG((size_t size
));
2965 /* Next four functions are used internally as callbacks. PNGAPI is required
2966 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2968 PNG_EXTERN
void PNGAPI png_default_read_data
PNGARG((png_structp png_ptr
,
2969 png_bytep data
, png_size_t length
));
2971 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2972 PNG_EXTERN
void PNGAPI png_push_fill_buffer
PNGARG((png_structp png_ptr
,
2973 png_bytep buffer
, png_size_t length
));
2976 PNG_EXTERN
void PNGAPI png_default_write_data
PNGARG((png_structp png_ptr
,
2977 png_bytep data
, png_size_t length
));
2979 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
2980 #if !defined(PNG_NO_STDIO)
2981 PNG_EXTERN
void PNGAPI png_default_flush
PNGARG((png_structp png_ptr
));
2984 #else /* PNG_1_0_X */
2985 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2986 PNG_EXTERN
void png_push_fill_buffer
PNGARG((png_structp png_ptr
,
2987 png_bytep buffer
, png_size_t length
));
2989 #endif /* PNG_1_0_X */
2991 /* Reset the CRC variable */
2992 PNG_EXTERN
void png_reset_crc
PNGARG((png_structp png_ptr
));
2994 /* Write the "data" buffer to whatever output you are using. */
2995 PNG_EXTERN
void png_write_data
PNGARG((png_structp png_ptr
, png_bytep data
,
2996 png_size_t length
));
2998 /* Read data from whatever input you are using into the "data" buffer */
2999 PNG_EXTERN
void png_read_data
PNGARG((png_structp png_ptr
, png_bytep data
,
3000 png_size_t length
));
3002 /* Read bytes into buf, and update png_ptr->crc */
3003 PNG_EXTERN
void png_crc_read
PNGARG((png_structp png_ptr
, png_bytep buf
,
3004 png_size_t length
));
3006 /* Decompress data in a chunk that uses compression */
3007 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3008 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3009 PNG_EXTERN png_charp png_decompress_chunk
PNGARG((png_structp png_ptr
,
3010 int comp_type
, png_charp chunkdata
, png_size_t chunklength
,
3011 png_size_t prefix_length
, png_size_t
*data_length
));
3014 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3015 PNG_EXTERN
int png_crc_finish
PNGARG((png_structp png_ptr
, png_uint_32 skip
));
3017 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3018 PNG_EXTERN
int png_crc_error
PNGARG((png_structp png_ptr
));
3020 /* Calculate the CRC over a section of data. Note that we are only
3021 * passing a maximum of 64K on systems that have this as a memory limit,
3022 * since this is the maximum buffer size we can specify.
3024 PNG_EXTERN
void png_calculate_crc
PNGARG((png_structp png_ptr
, png_bytep ptr
,
3025 png_size_t length
));
3027 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3028 PNG_EXTERN
void png_flush
PNGARG((png_structp png_ptr
));
3031 /* simple function to write the signature */
3032 PNG_EXTERN
void png_write_sig
PNGARG((png_structp png_ptr
));
3034 /* write various chunks */
3036 /* Write the IHDR chunk, and update the png_struct with the necessary
3039 PNG_EXTERN
void png_write_IHDR
PNGARG((png_structp png_ptr
, png_uint_32 width
,
3041 int bit_depth
, int color_type
, int compression_method
, int filter_method
,
3042 int interlace_method
));
3044 PNG_EXTERN
void png_write_PLTE
PNGARG((png_structp png_ptr
, png_colorp palette
,
3045 png_uint_32 num_pal
));
3047 PNG_EXTERN
void png_write_IDAT
PNGARG((png_structp png_ptr
, png_bytep data
,
3048 png_size_t length
));
3050 PNG_EXTERN
void png_write_IEND
PNGARG((png_structp png_ptr
));
3052 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3053 #ifdef PNG_FLOATING_POINT_SUPPORTED
3054 PNG_EXTERN
void png_write_gAMA
PNGARG((png_structp png_ptr
, double file_gamma
));
3056 #ifdef PNG_FIXED_POINT_SUPPORTED
3057 PNG_EXTERN
void png_write_gAMA_fixed
PNGARG((png_structp png_ptr
, png_fixed_point
3062 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3063 PNG_EXTERN
void png_write_sBIT
PNGARG((png_structp png_ptr
, png_color_8p sbit
,
3067 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3068 #ifdef PNG_FLOATING_POINT_SUPPORTED
3069 PNG_EXTERN
void png_write_cHRM
PNGARG((png_structp png_ptr
,
3070 double white_x
, double white_y
,
3071 double red_x
, double red_y
, double green_x
, double green_y
,
3072 double blue_x
, double blue_y
));
3074 #ifdef PNG_FIXED_POINT_SUPPORTED
3075 PNG_EXTERN
void png_write_cHRM_fixed
PNGARG((png_structp png_ptr
,
3076 png_fixed_point int_white_x
, png_fixed_point int_white_y
,
3077 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
3078 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
3079 png_fixed_point int_blue_y
));
3083 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3084 PNG_EXTERN
void png_write_sRGB
PNGARG((png_structp png_ptr
,
3088 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3089 PNG_EXTERN
void png_write_iCCP
PNGARG((png_structp png_ptr
,
3090 png_charp name
, int compression_type
,
3091 png_charp profile
, int proflen
));
3092 /* Note to maintainer: profile should be png_bytep */
3095 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3096 PNG_EXTERN
void png_write_sPLT
PNGARG((png_structp png_ptr
,
3097 png_sPLT_tp palette
));
3100 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3101 PNG_EXTERN
void png_write_tRNS
PNGARG((png_structp png_ptr
, png_bytep trans
,
3102 png_color_16p values
, int number
, int color_type
));
3105 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3106 PNG_EXTERN
void png_write_bKGD
PNGARG((png_structp png_ptr
,
3107 png_color_16p values
, int color_type
));
3110 #if defined(PNG_WRITE_hIST_SUPPORTED)
3111 PNG_EXTERN
void png_write_hIST
PNGARG((png_structp png_ptr
, png_uint_16p hist
,
3115 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3116 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3117 PNG_EXTERN png_size_t png_check_keyword
PNGARG((png_structp png_ptr
,
3118 png_charp key
, png_charpp new_key
));
3121 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3122 PNG_EXTERN
void png_write_tEXt
PNGARG((png_structp png_ptr
, png_charp key
,
3123 png_charp text
, png_size_t text_len
));
3126 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3127 PNG_EXTERN
void png_write_zTXt
PNGARG((png_structp png_ptr
, png_charp key
,
3128 png_charp text
, png_size_t text_len
, int compression
));
3131 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3132 PNG_EXTERN
void png_write_iTXt
PNGARG((png_structp png_ptr
,
3133 int compression
, png_charp key
, png_charp lang
, png_charp lang_key
,
3137 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3138 PNG_EXTERN
int png_set_text_2
PNGARG((png_structp png_ptr
,
3139 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
3142 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3143 PNG_EXTERN
void png_write_oFFs
PNGARG((png_structp png_ptr
,
3144 png_int_32 x_offset
, png_int_32 y_offset
, int unit_type
));
3147 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3148 PNG_EXTERN
void png_write_pCAL
PNGARG((png_structp png_ptr
, png_charp purpose
,
3149 png_int_32 X0
, png_int_32 X1
, int type
, int nparams
,
3150 png_charp units
, png_charpp params
));
3153 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3154 PNG_EXTERN
void png_write_pHYs
PNGARG((png_structp png_ptr
,
3155 png_uint_32 x_pixels_per_unit
, png_uint_32 y_pixels_per_unit
,
3159 #if defined(PNG_WRITE_tIME_SUPPORTED)
3160 PNG_EXTERN
void png_write_tIME
PNGARG((png_structp png_ptr
,
3161 png_timep mod_time
));
3164 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3165 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3166 PNG_EXTERN
void png_write_sCAL
PNGARG((png_structp png_ptr
,
3167 int unit
, double width
, double height
));
3169 #ifdef PNG_FIXED_POINT_SUPPORTED
3170 PNG_EXTERN
void png_write_sCAL_s
PNGARG((png_structp png_ptr
,
3171 int unit
, png_charp width
, png_charp height
));
3176 /* Called when finished processing a row of data */
3177 PNG_EXTERN
void png_write_finish_row
PNGARG((png_structp png_ptr
));
3179 /* Internal use only. Called before first row of data */
3180 PNG_EXTERN
void png_write_start_row
PNGARG((png_structp png_ptr
));
3182 #if defined(PNG_READ_GAMMA_SUPPORTED)
3183 PNG_EXTERN
void png_build_gamma_table
PNGARG((png_structp png_ptr
));
3186 /* combine a row of data, dealing with alpha, etc. if requested */
3187 PNG_EXTERN
void png_combine_row
PNGARG((png_structp png_ptr
, png_bytep row
,
3190 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3191 /* expand an interlaced row */
3192 /* OLD pre-1.0.9 interface:
3193 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3194 png_bytep row, int pass, png_uint_32 transformations));
3196 PNG_EXTERN
void png_do_read_interlace
PNGARG((png_structp png_ptr
));
3199 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3201 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3202 /* grab pixels out of a row for an interlaced pass */
3203 PNG_EXTERN
void png_do_write_interlace
PNGARG((png_row_infop row_info
,
3204 png_bytep row
, int pass
));
3207 /* unfilter a row */
3208 PNG_EXTERN
void png_read_filter_row
PNGARG((png_structp png_ptr
,
3209 png_row_infop row_info
, png_bytep row
, png_bytep prev_row
, int filter
));
3211 /* Choose the best filter to use and filter the row data */
3212 PNG_EXTERN
void png_write_find_filter
PNGARG((png_structp png_ptr
,
3213 png_row_infop row_info
));
3215 /* Write out the filtered row. */
3216 PNG_EXTERN
void png_write_filtered_row
PNGARG((png_structp png_ptr
,
3217 png_bytep filtered_row
));
3218 /* finish a row while reading, dealing with interlacing passes, etc. */
3219 PNG_EXTERN
void png_read_finish_row
PNGARG((png_structp png_ptr
));
3221 /* initialize the row buffers, etc. */
3222 PNG_EXTERN
void png_read_start_row
PNGARG((png_structp png_ptr
));
3223 /* optional call to update the users info structure */
3224 PNG_EXTERN
void png_read_transform_info
PNGARG((png_structp png_ptr
,
3225 png_infop info_ptr
));
3227 /* these are the functions that do the transformations */
3228 #if defined(PNG_READ_FILLER_SUPPORTED)
3229 PNG_EXTERN
void png_do_read_filler
PNGARG((png_row_infop row_info
,
3230 png_bytep row
, png_uint_32 filler
, png_uint_32 flags
));
3233 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3234 PNG_EXTERN
void png_do_read_swap_alpha
PNGARG((png_row_infop row_info
,
3238 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3239 PNG_EXTERN
void png_do_write_swap_alpha
PNGARG((png_row_infop row_info
,
3243 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3244 PNG_EXTERN
void png_do_read_invert_alpha
PNGARG((png_row_infop row_info
,
3248 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3249 PNG_EXTERN
void png_do_write_invert_alpha
PNGARG((png_row_infop row_info
,
3253 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3254 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3255 PNG_EXTERN
void png_do_strip_filler
PNGARG((png_row_infop row_info
,
3256 png_bytep row
, png_uint_32 flags
));
3259 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3260 PNG_EXTERN
void png_do_swap
PNGARG((png_row_infop row_info
, png_bytep row
));
3263 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3264 PNG_EXTERN
void png_do_packswap
PNGARG((png_row_infop row_info
, png_bytep row
));
3267 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3268 PNG_EXTERN
int png_do_rgb_to_gray
PNGARG((png_structp png_ptr
, png_row_infop
3269 row_info
, png_bytep row
));
3272 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3273 PNG_EXTERN
void png_do_gray_to_rgb
PNGARG((png_row_infop row_info
,
3277 #if defined(PNG_READ_PACK_SUPPORTED)
3278 PNG_EXTERN
void png_do_unpack
PNGARG((png_row_infop row_info
, png_bytep row
));
3281 #if defined(PNG_READ_SHIFT_SUPPORTED)
3282 PNG_EXTERN
void png_do_unshift
PNGARG((png_row_infop row_info
, png_bytep row
,
3283 png_color_8p sig_bits
));
3286 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3287 PNG_EXTERN
void png_do_invert
PNGARG((png_row_infop row_info
, png_bytep row
));
3290 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3291 PNG_EXTERN
void png_do_chop
PNGARG((png_row_infop row_info
, png_bytep row
));
3294 #if defined(PNG_READ_DITHER_SUPPORTED)
3295 PNG_EXTERN
void png_do_dither
PNGARG((png_row_infop row_info
,
3296 png_bytep row
, png_bytep palette_lookup
, png_bytep dither_lookup
));
3298 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3299 PNG_EXTERN
void png_correct_palette
PNGARG((png_structp png_ptr
,
3300 png_colorp palette
, int num_palette
));
3304 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3305 PNG_EXTERN
void png_do_bgr
PNGARG((png_row_infop row_info
, png_bytep row
));
3308 #if defined(PNG_WRITE_PACK_SUPPORTED)
3309 PNG_EXTERN
void png_do_pack
PNGARG((png_row_infop row_info
,
3310 png_bytep row
, png_uint_32 bit_depth
));
3313 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3314 PNG_EXTERN
void png_do_shift
PNGARG((png_row_infop row_info
, png_bytep row
,
3315 png_color_8p bit_depth
));
3318 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3319 #if defined(PNG_READ_GAMMA_SUPPORTED)
3320 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3321 png_color_16p trans_values
, png_color_16p background
,
3322 png_color_16p background_1
,
3323 png_bytep gamma_table
, png_bytep gamma_from_1
, png_bytep gamma_to_1
,
3324 png_uint_16pp gamma_16
, png_uint_16pp gamma_16_from_1
,
3325 png_uint_16pp gamma_16_to_1
, int gamma_shift
));
3327 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3328 png_color_16p trans_values
, png_color_16p background
));
3332 #if defined(PNG_READ_GAMMA_SUPPORTED)
3333 PNG_EXTERN
void png_do_gamma
PNGARG((png_row_infop row_info
, png_bytep row
,
3334 png_bytep gamma_table
, png_uint_16pp gamma_16_table
,
3338 #if defined(PNG_READ_EXPAND_SUPPORTED)
3339 PNG_EXTERN
void png_do_expand_palette
PNGARG((png_row_infop row_info
,
3340 png_bytep row
, png_colorp palette
, png_bytep trans
, int num_trans
));
3341 PNG_EXTERN
void png_do_expand
PNGARG((png_row_infop row_info
,
3342 png_bytep row
, png_color_16p trans_value
));
3345 /* The following decodes the appropriate chunks, and does error correction,
3346 * then calls the appropriate callback for the chunk if it is valid.
3349 /* decode the IHDR chunk */
3350 PNG_EXTERN
void png_handle_IHDR
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3351 png_uint_32 length
));
3352 PNG_EXTERN
void png_handle_PLTE
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3353 png_uint_32 length
));
3354 PNG_EXTERN
void png_handle_IEND
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3355 png_uint_32 length
));
3357 #if defined(PNG_READ_bKGD_SUPPORTED)
3358 PNG_EXTERN
void png_handle_bKGD
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3359 png_uint_32 length
));
3362 #if defined(PNG_READ_cHRM_SUPPORTED)
3363 PNG_EXTERN
void png_handle_cHRM
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3364 png_uint_32 length
));
3367 #if defined(PNG_READ_gAMA_SUPPORTED)
3368 PNG_EXTERN
void png_handle_gAMA
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3369 png_uint_32 length
));
3372 #if defined(PNG_READ_hIST_SUPPORTED)
3373 PNG_EXTERN
void png_handle_hIST
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3374 png_uint_32 length
));
3377 #if defined(PNG_READ_iCCP_SUPPORTED)
3378 extern void png_handle_iCCP
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3379 png_uint_32 length
));
3380 #endif /* PNG_READ_iCCP_SUPPORTED */
3382 #if defined(PNG_READ_iTXt_SUPPORTED)
3383 PNG_EXTERN
void png_handle_iTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3384 png_uint_32 length
));
3387 #if defined(PNG_READ_oFFs_SUPPORTED)
3388 PNG_EXTERN
void png_handle_oFFs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3389 png_uint_32 length
));
3392 #if defined(PNG_READ_pCAL_SUPPORTED)
3393 PNG_EXTERN
void png_handle_pCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3394 png_uint_32 length
));
3397 #if defined(PNG_READ_pHYs_SUPPORTED)
3398 PNG_EXTERN
void png_handle_pHYs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3399 png_uint_32 length
));
3402 #if defined(PNG_READ_sBIT_SUPPORTED)
3403 PNG_EXTERN
void png_handle_sBIT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3404 png_uint_32 length
));
3407 #if defined(PNG_READ_sCAL_SUPPORTED)
3408 PNG_EXTERN
void png_handle_sCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3409 png_uint_32 length
));
3412 #if defined(PNG_READ_sPLT_SUPPORTED)
3413 extern void png_handle_sPLT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3414 png_uint_32 length
));
3415 #endif /* PNG_READ_sPLT_SUPPORTED */
3417 #if defined(PNG_READ_sRGB_SUPPORTED)
3418 PNG_EXTERN
void png_handle_sRGB
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3419 png_uint_32 length
));
3422 #if defined(PNG_READ_tEXt_SUPPORTED)
3423 PNG_EXTERN
void png_handle_tEXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3424 png_uint_32 length
));
3427 #if defined(PNG_READ_tIME_SUPPORTED)
3428 PNG_EXTERN
void png_handle_tIME
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3429 png_uint_32 length
));
3432 #if defined(PNG_READ_tRNS_SUPPORTED)
3433 PNG_EXTERN
void png_handle_tRNS
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3434 png_uint_32 length
));
3437 #if defined(PNG_READ_zTXt_SUPPORTED)
3438 PNG_EXTERN
void png_handle_zTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3439 png_uint_32 length
));
3442 PNG_EXTERN
void png_handle_unknown
PNGARG((png_structp png_ptr
,
3443 png_infop info_ptr
, png_uint_32 length
));
3445 PNG_EXTERN
void png_check_chunk_name
PNGARG((png_structp png_ptr
,
3446 png_bytep chunk_name
));
3448 /* handle the transformations for reading and writing */
3449 PNG_EXTERN
void png_do_read_transformations
PNGARG((png_structp png_ptr
));
3450 PNG_EXTERN
void png_do_write_transformations
PNGARG((png_structp png_ptr
));
3452 PNG_EXTERN
void png_init_read_transformations
PNGARG((png_structp png_ptr
));
3454 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3455 PNG_EXTERN
void png_push_read_chunk
PNGARG((png_structp png_ptr
,
3456 png_infop info_ptr
));
3457 PNG_EXTERN
void png_push_read_sig
PNGARG((png_structp png_ptr
,
3458 png_infop info_ptr
));
3459 PNG_EXTERN
void png_push_check_crc
PNGARG((png_structp png_ptr
));
3460 PNG_EXTERN
void png_push_crc_skip
PNGARG((png_structp png_ptr
,
3461 png_uint_32 length
));
3462 PNG_EXTERN
void png_push_crc_finish
PNGARG((png_structp png_ptr
));
3463 PNG_EXTERN
void png_push_save_buffer
PNGARG((png_structp png_ptr
));
3464 PNG_EXTERN
void png_push_restore_buffer
PNGARG((png_structp png_ptr
,
3465 png_bytep buffer
, png_size_t buffer_length
));
3466 PNG_EXTERN
void png_push_read_IDAT
PNGARG((png_structp png_ptr
));
3467 PNG_EXTERN
void png_process_IDAT_data
PNGARG((png_structp png_ptr
,
3468 png_bytep buffer
, png_size_t buffer_length
));
3469 PNG_EXTERN
void png_push_process_row
PNGARG((png_structp png_ptr
));
3470 PNG_EXTERN
void png_push_handle_unknown
PNGARG((png_structp png_ptr
,
3471 png_infop info_ptr
, png_uint_32 length
));
3472 PNG_EXTERN
void png_push_have_info
PNGARG((png_structp png_ptr
,
3473 png_infop info_ptr
));
3474 PNG_EXTERN
void png_push_have_end
PNGARG((png_structp png_ptr
,
3475 png_infop info_ptr
));
3476 PNG_EXTERN
void png_push_have_row
PNGARG((png_structp png_ptr
, png_bytep row
));
3477 PNG_EXTERN
void png_push_read_end
PNGARG((png_structp png_ptr
,
3478 png_infop info_ptr
));
3479 PNG_EXTERN
void png_process_some_data
PNGARG((png_structp png_ptr
,
3480 png_infop info_ptr
));
3481 PNG_EXTERN
void png_read_push_finish_row
PNGARG((png_structp png_ptr
));
3482 #if defined(PNG_READ_tEXt_SUPPORTED)
3483 PNG_EXTERN
void png_push_handle_tEXt
PNGARG((png_structp png_ptr
,
3484 png_infop info_ptr
, png_uint_32 length
));
3485 PNG_EXTERN
void png_push_read_tEXt
PNGARG((png_structp png_ptr
,
3486 png_infop info_ptr
));
3488 #if defined(PNG_READ_zTXt_SUPPORTED)
3489 PNG_EXTERN
void png_push_handle_zTXt
PNGARG((png_structp png_ptr
,
3490 png_infop info_ptr
, png_uint_32 length
));
3491 PNG_EXTERN
void png_push_read_zTXt
PNGARG((png_structp png_ptr
,
3492 png_infop info_ptr
));
3494 #if defined(PNG_READ_iTXt_SUPPORTED)
3495 PNG_EXTERN
void png_push_handle_iTXt
PNGARG((png_structp png_ptr
,
3496 png_infop info_ptr
, png_uint_32 length
));
3497 PNG_EXTERN
void png_push_read_iTXt
PNGARG((png_structp png_ptr
,
3498 png_infop info_ptr
));
3501 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3503 #ifdef PNG_MNG_FEATURES_SUPPORTED
3504 PNG_EXTERN
void png_do_read_intrapixel
PNGARG((png_row_infop row_info
,
3506 PNG_EXTERN
void png_do_write_intrapixel
PNGARG((png_row_infop row_info
,
3510 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3511 #if defined(PNG_MMX_CODE_SUPPORTED)
3512 /* png.c */ /* PRIVATE */
3513 PNG_EXTERN
void png_init_mmx_flags
PNGARG((png_structp png_ptr
));
3517 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3518 PNG_EXTERN png_uint_32 png_get_pixels_per_inch
PNGARG((png_structp png_ptr
,
3519 png_infop info_ptr
));
3521 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch
PNGARG((png_structp png_ptr
,
3522 png_infop info_ptr
));
3524 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch
PNGARG((png_structp png_ptr
,
3525 png_infop info_ptr
));
3527 PNG_EXTERN
float png_get_x_offset_inches
PNGARG((png_structp png_ptr
,
3528 png_infop info_ptr
));
3530 PNG_EXTERN
float png_get_y_offset_inches
PNGARG((png_structp png_ptr
,
3531 png_infop info_ptr
));
3533 #if defined(PNG_pHYs_SUPPORTED)
3534 PNG_EXTERN png_uint_32 png_get_pHYs_dpi
PNGARG((png_structp png_ptr
,
3535 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
3536 #endif /* PNG_pHYs_SUPPORTED */
3537 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3539 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3541 #endif /* PNG_INTERNAL */
3547 #endif /* PNG_VERSION_INFO_ONLY */
3548 /* do not put anything past this line */
projects / reactos.git / blob