2 /* png.h - header file for PNG reference library
4 * libpng version 1.2.20 - September 8, 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 1.2.20 - September 8, 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]
164 * Henceforth the source version will match the shared-library major
165 * and minor numbers; the shared-library major version number will be
166 * used for changes in backward compatibility, as it is intended. The
167 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
168 * for applications, is an unsigned integer of the form xyyzz corresponding
169 * to the source version x.y.z (leading zeros in y and z). Beta versions
170 * were given the previous public release number plus a letter, until
171 * version 1.0.6j; from then on they were given the upcoming public
172 * release number plus "betaNN" or "rcN".
174 * Binary incompatibility exists only when applications make direct access
175 * to the info_ptr or png_ptr members through png.h, and the compiled
176 * application is loaded with a different version of the library.
178 * DLLNUM will change each time there are forward or backward changes
179 * in binary compatibility (e.g., when a new feature is added).
181 * See libpng.txt or libpng.3 for more information. The PNG specification
182 * is available as a W3C Recommendation and as an ISO Specification,
183 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
187 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
189 * If you modify libpng you may insert additional notices immediately following
192 * libpng versions 1.2.6, August 15, 2004, through 1.2.20, September 8, 2007, are
193 * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
194 * distributed according to the same disclaimer and license as libpng-1.2.5
195 * with the following individual added to the list of Contributing Authors:
199 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
200 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
201 * distributed according to the same disclaimer and license as libpng-1.0.6
202 * with the following individuals added to the list of Contributing Authors:
204 * Simon-Pierre Cadieux
208 * and with the following additions to the disclaimer:
210 * There is no warranty against interference with your enjoyment of the
211 * library or against infringement. There is no warranty that our
212 * efforts or the library will fulfill any of your particular purposes
213 * or needs. This library is provided with all faults, and the entire
214 * risk of satisfactory quality, performance, accuracy, and effort is with
217 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
218 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
219 * distributed according to the same disclaimer and license as libpng-0.96,
220 * with the following individuals added to the list of Contributing Authors:
223 * Glenn Randers-Pehrson
226 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
227 * Copyright (c) 1996, 1997 Andreas Dilger
228 * Distributed according to the same disclaimer and license as libpng-0.88,
229 * with the following individuals added to the list of Contributing Authors:
238 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
239 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
241 * For the purposes of this copyright and license, "Contributing Authors"
242 * is defined as the following set of individuals:
250 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
251 * and Group 42, Inc. disclaim all warranties, expressed or implied,
252 * including, without limitation, the warranties of merchantability and of
253 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
254 * assume no liability for direct, indirect, incidental, special, exemplary,
255 * or consequential damages, which may result from the use of the PNG
256 * Reference Library, even if advised of the possibility of such damage.
258 * Permission is hereby granted to use, copy, modify, and distribute this
259 * source code, or portions hereof, for any purpose, without fee, subject
260 * to the following restrictions:
262 * 1. The origin of this source code must not be misrepresented.
264 * 2. Altered versions must be plainly marked as such and
265 * must not be misrepresented as being the original source.
267 * 3. This Copyright notice may not be removed or altered from
268 * any source or altered source distribution.
270 * The Contributing Authors and Group 42, Inc. specifically permit, without
271 * fee, and encourage the use of this source code as a component to
272 * supporting the PNG file format in commercial products. If you use this
273 * source code in a product, acknowledgment is not required but would be
278 * A "png_get_copyright" function is available, for convenient use in "about"
279 * boxes and the like:
281 * printf("%s",png_get_copyright(NULL));
283 * Also, the PNG logo (in PNG format, of course) is supplied in the
284 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
288 * Libpng is OSI Certified Open Source Software. OSI Certified is a
289 * certification mark of the Open Source Initiative.
293 * The contributing authors would like to thank all those who helped
294 * with testing, bug fixes, and patience. This wouldn't have been
295 * possible without all of you.
297 * Thanks to Frank J. T. Wojcik for helping with the documentation.
301 * Y2K compliance in libpng:
302 * =========================
306 * Since the PNG Development group is an ad-hoc body, we can't make
307 * an official declaration.
309 * This is your unofficial assurance that libpng from version 0.71 and
310 * upward through 1.2.20 are Y2K compliant. It is my belief that earlier
311 * versions were also Y2K compliant.
313 * Libpng only has three year fields. One is a 2-byte unsigned integer
314 * that will hold years up to 65535. The other two hold the date in text
315 * format, and will hold years up to 9999.
318 * "png_uint_16 year" in png_time_struct.
321 * "png_charp time_buffer" in png_struct and
322 * "near_time_buffer", which is a local character string in png.c.
324 * There are seven time-related functions:
325 * png.c: png_convert_to_rfc_1123() in png.c
326 * (formerly png_convert_to_rfc_1152() in error)
327 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
328 * png_convert_from_time_t() in pngwrite.c
329 * png_get_tIME() in pngget.c
330 * png_handle_tIME() in pngrutil.c, called in pngread.c
331 * png_set_tIME() in pngset.c
332 * png_write_tIME() in pngwutil.c, called in pngwrite.c
334 * All handle dates properly in a Y2K environment. The
335 * png_convert_from_time_t() function calls gmtime() to convert from system
336 * clock time, which returns (year - 1900), which we properly convert to
337 * the full 4-digit year. There is a possibility that applications using
338 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
339 * function, or that they are incorrectly passing only a 2-digit year
340 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
341 * but this is not under our control. The libpng documentation has always
342 * stated that it works with 4-digit years, and the APIs have been
343 * documented as such.
345 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
346 * integer to hold the year, and can hold years as large as 65535.
348 * zlib, upon which libpng depends, is also Y2K compliant. It contains
349 * no date-related code.
351 * Glenn Randers-Pehrson
353 * PNG Development Group
359 /* This is not the place to learn how to use libpng. The file libpng.txt
360 * describes how to use libpng, and the file example.c summarizes it
361 * with some code on which to build. This file is useful for looking
362 * at the actual function definitions and structure components.
365 /* Version information for png.h - this should match the version in png.c */
366 #define PNG_LIBPNG_VER_STRING "1.2.20"
367 #define PNG_HEADER_VERSION_STRING \
368 " libpng version 1.2.20 - September 8, 2007\n"
370 #define PNG_LIBPNG_VER_SONUM 0
371 #define PNG_LIBPNG_VER_DLLNUM 13
373 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
374 #define PNG_LIBPNG_VER_MAJOR 1
375 #define PNG_LIBPNG_VER_MINOR 2
376 #define PNG_LIBPNG_VER_RELEASE 20
377 /* This should match the numeric part of the final component of
378 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
380 #define PNG_LIBPNG_VER_BUILD 0
383 #define PNG_LIBPNG_BUILD_ALPHA 1
384 #define PNG_LIBPNG_BUILD_BETA 2
385 #define PNG_LIBPNG_BUILD_RC 3
386 #define PNG_LIBPNG_BUILD_STABLE 4
387 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
389 /* Release-Specific Flags */
390 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
391 PNG_LIBPNG_BUILD_STABLE only */
392 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
393 PNG_LIBPNG_BUILD_SPECIAL */
394 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
395 PNG_LIBPNG_BUILD_PRIVATE */
397 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
399 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
400 * We must not include leading zeros.
401 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
402 * version 1.0.0 was mis-numbered 100 instead of 10000). From
403 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
404 #define PNG_LIBPNG_VER 10220 /* 1.2.20 */
406 #ifndef PNG_VERSION_INFO_ONLY
407 /* include the compression library's header */
411 /* include all user configurable info, including optional assembler routines */
415 * Added at libpng-1.2.8 */
416 /* Ref MSDN: Private as priority over Special
417 * VS_FF_PRIVATEBUILD File *was not* built using standard release
418 * procedures. If this value is given, the StringFileInfo block must
419 * contain a PrivateBuild string.
421 * VS_FF_SPECIALBUILD File *was* built by the original company using
422 * standard release procedures but is a variation of the standard
423 * file of the same version number. If this value is given, the
424 * StringFileInfo block must contain a SpecialBuild string.
427 #if defined(PNG_USER_PRIVATEBUILD)
428 # define PNG_LIBPNG_BUILD_TYPE \
429 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
431 # if defined(PNG_LIBPNG_SPECIALBUILD)
432 # define PNG_LIBPNG_BUILD_TYPE \
433 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
435 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
439 #ifndef PNG_VERSION_INFO_ONLY
441 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
444 #endif /* __cplusplus */
446 /* This file is arranged in several sections. The first section contains
447 * structure and type definitions. The second section contains the external
448 * library functions, while the third has the internal library functions,
449 * which applications aren't expected to use directly.
452 #ifndef PNG_NO_TYPECAST_NULL
453 #define int_p_NULL (int *)NULL
454 #define png_bytep_NULL (png_bytep)NULL
455 #define png_bytepp_NULL (png_bytepp)NULL
456 #define png_doublep_NULL (png_doublep)NULL
457 #define png_error_ptr_NULL (png_error_ptr)NULL
458 #define png_flush_ptr_NULL (png_flush_ptr)NULL
459 #define png_free_ptr_NULL (png_free_ptr)NULL
460 #define png_infopp_NULL (png_infopp)NULL
461 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
462 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
463 #define png_rw_ptr_NULL (png_rw_ptr)NULL
464 #define png_structp_NULL (png_structp)NULL
465 #define png_uint_16p_NULL (png_uint_16p)NULL
466 #define png_voidp_NULL (png_voidp)NULL
467 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
469 #define int_p_NULL NULL
470 #define png_bytep_NULL NULL
471 #define png_bytepp_NULL NULL
472 #define png_doublep_NULL NULL
473 #define png_error_ptr_NULL NULL
474 #define png_flush_ptr_NULL NULL
475 #define png_free_ptr_NULL NULL
476 #define png_infopp_NULL NULL
477 #define png_malloc_ptr_NULL NULL
478 #define png_read_status_ptr_NULL NULL
479 #define png_rw_ptr_NULL NULL
480 #define png_structp_NULL NULL
481 #define png_uint_16p_NULL NULL
482 #define png_voidp_NULL NULL
483 #define png_write_status_ptr_NULL NULL
486 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
487 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
488 /* Version information for C files, stored in png.c. This had better match
491 #ifdef PNG_USE_GLOBAL_ARRAYS
492 PNG_EXPORT_VAR (PNG_CONST
char) png_libpng_ver
[18];
493 /* need room for 99.99.99beta99z */
495 #define png_libpng_ver png_get_header_ver(NULL)
498 #ifdef PNG_USE_GLOBAL_ARRAYS
499 /* This was removed in version 1.0.5c */
500 /* Structures to facilitate easy interlacing. See png.c for more details */
501 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_start
[7];
502 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_inc
[7];
503 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_ystart
[7];
504 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_yinc
[7];
505 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_mask
[7];
506 PNG_EXPORT_VAR (PNG_CONST
int FARDATA
) png_pass_dsp_mask
[7];
507 /* This isn't currently used. If you need it, see png.c for more details.
508 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
512 #endif /* PNG_NO_EXTERN */
514 /* Three color definitions. The order of the red, green, and blue, (and the
515 * exact size) is not important, although the size of the fields need to
516 * be png_byte or png_uint_16 (as defined below).
518 typedef struct png_color_struct
524 typedef png_color FAR
* png_colorp
;
525 typedef png_color FAR
* FAR
* png_colorpp
;
527 typedef struct png_color_16_struct
529 png_byte index
; /* used for palette files */
530 png_uint_16 red
; /* for use in red green blue files */
533 png_uint_16 gray
; /* for use in grayscale files */
535 typedef png_color_16 FAR
* png_color_16p
;
536 typedef png_color_16 FAR
* FAR
* png_color_16pp
;
538 typedef struct png_color_8_struct
540 png_byte red
; /* for use in red green blue files */
543 png_byte gray
; /* for use in grayscale files */
544 png_byte alpha
; /* for alpha channel files */
546 typedef png_color_8 FAR
* png_color_8p
;
547 typedef png_color_8 FAR
* FAR
* png_color_8pp
;
550 * The following two structures are used for the in-core representation
553 typedef struct png_sPLT_entry_struct
559 png_uint_16 frequency
;
561 typedef png_sPLT_entry FAR
* png_sPLT_entryp
;
562 typedef png_sPLT_entry FAR
* FAR
* png_sPLT_entrypp
;
564 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
565 * occupy the LSB of their respective members, and the MSB of each member
566 * is zero-filled. The frequency member always occupies the full 16 bits.
569 typedef struct png_sPLT_struct
571 png_charp name
; /* palette name */
572 png_byte depth
; /* depth of palette samples */
573 png_sPLT_entryp entries
; /* palette entries */
574 png_int_32 nentries
; /* number of palette entries */
576 typedef png_sPLT_t FAR
* png_sPLT_tp
;
577 typedef png_sPLT_t FAR
* FAR
* png_sPLT_tpp
;
579 #ifdef PNG_TEXT_SUPPORTED
580 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
581 * and whether that contents is compressed or not. The "key" field
582 * points to a regular zero-terminated C string. The "text", "lang", and
583 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
584 * However, the * structure returned by png_get_text() will always contain
585 * regular zero-terminated C strings (possibly empty), never NULL pointers,
586 * so they can be safely used in printf() and other string-handling functions.
588 typedef struct png_text_struct
590 int compression
; /* compression value:
595 png_charp key
; /* keyword, 1-79 character description of "text" */
596 png_charp text
; /* comment, may be an empty string (ie "")
598 png_size_t text_length
; /* length of the text string */
599 #ifdef PNG_iTXt_SUPPORTED
600 png_size_t itxt_length
; /* length of the itxt string */
601 png_charp lang
; /* language code, 0-79 characters
603 png_charp lang_key
; /* keyword translated UTF-8 string, 0 or more
604 chars or a NULL pointer */
607 typedef png_text FAR
* png_textp
;
608 typedef png_text FAR
* FAR
* png_textpp
;
611 /* Supported compression types for text in PNG files (tEXt, and zTXt).
612 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
613 #define PNG_TEXT_COMPRESSION_NONE_WR -3
614 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
615 #define PNG_TEXT_COMPRESSION_NONE -1
616 #define PNG_TEXT_COMPRESSION_zTXt 0
617 #define PNG_ITXT_COMPRESSION_NONE 1
618 #define PNG_ITXT_COMPRESSION_zTXt 2
619 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
621 /* png_time is a way to hold the time in an machine independent way.
622 * Two conversions are provided, both from time_t and struct tm. There
623 * is no portable way to convert to either of these structures, as far
624 * as I know. If you know of a portable way, send it to me. As a side
625 * note - PNG has always been Year 2000 compliant!
627 typedef struct png_time_struct
629 png_uint_16 year
; /* full year, as in, 1995 */
630 png_byte month
; /* month of year, 1 - 12 */
631 png_byte day
; /* day of month, 1 - 31 */
632 png_byte hour
; /* hour of day, 0 - 23 */
633 png_byte minute
; /* minute of hour, 0 - 59 */
634 png_byte second
; /* second of minute, 0 - 60 (for leap seconds) */
636 typedef png_time FAR
* png_timep
;
637 typedef png_time FAR
* FAR
* png_timepp
;
639 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
640 /* png_unknown_chunk is a structure to hold queued chunks for which there is
641 * no specific support. The idea is that we can use this to queue
642 * up private chunks for output even though the library doesn't actually
643 * know about their semantics.
645 typedef struct png_unknown_chunk_t
651 /* libpng-using applications should NOT directly modify this byte. */
652 png_byte location
; /* mode of operation at read time */
655 typedef png_unknown_chunk FAR
* png_unknown_chunkp
;
656 typedef png_unknown_chunk FAR
* FAR
* png_unknown_chunkpp
;
659 /* png_info is a structure that holds the information in a PNG file so
660 * that the application can find out the characteristics of the image.
661 * If you are reading the file, this structure will tell you what is
662 * in the PNG file. If you are writing the file, fill in the information
663 * you want to put into the PNG file, then call png_write_info().
664 * The names chosen should be very close to the PNG specification, so
665 * consult that document for information about the meaning of each field.
667 * With libpng < 0.95, it was only possible to directly set and read the
668 * the values in the png_info_struct, which meant that the contents and
669 * order of the values had to remain fixed. With libpng 0.95 and later,
670 * however, there are now functions that abstract the contents of
671 * png_info_struct from the application, so this makes it easier to use
672 * libpng with dynamic libraries, and even makes it possible to use
673 * libraries that don't have all of the libpng ancillary chunk-handing
676 * In any case, the order of the parameters in png_info_struct should NOT
677 * be changed for as long as possible to keep compatibility with applications
678 * that use the old direct-access method with png_info_struct.
680 * The following members may have allocated storage attached that should be
681 * cleaned up before the structure is discarded: palette, trans, text,
682 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
683 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
684 * are automatically freed when the info structure is deallocated, if they were
685 * allocated internally by libpng. This behavior can be changed by means
686 * of the png_data_freer() function.
688 * More allocation details: all the chunk-reading functions that
689 * change these members go through the corresponding png_set_*
690 * functions. A function to clear these members is available: see
691 * png_free_data(). The png_set_* functions do not depend on being
692 * able to point info structure members to any of the storage they are
693 * passed (they make their own copies), EXCEPT that the png_set_text
694 * functions use the same storage passed to them in the text_ptr or
695 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
696 * functions do not make their own copies.
698 typedef struct png_info_struct
700 /* the following are necessary for every PNG file */
701 png_uint_32 width
; /* width of image in pixels (from IHDR) */
702 png_uint_32 height
; /* height of image in pixels (from IHDR) */
703 png_uint_32 valid
; /* valid chunk data (see PNG_INFO_ below) */
704 png_uint_32 rowbytes
; /* bytes needed to hold an untransformed row */
705 png_colorp palette
; /* array of color values (valid & PNG_INFO_PLTE) */
706 png_uint_16 num_palette
; /* number of color entries in "palette" (PLTE) */
707 png_uint_16 num_trans
; /* number of transparent palette color (tRNS) */
708 png_byte bit_depth
; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
709 png_byte color_type
; /* see PNG_COLOR_TYPE_ below (from IHDR) */
710 /* The following three should have been named *_method not *_type */
711 png_byte compression_type
; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
712 png_byte filter_type
; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
713 png_byte interlace_type
; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
715 /* The following is informational only on read, and not used on writes. */
716 png_byte channels
; /* number of data channels per pixel (1, 2, 3, 4) */
717 png_byte pixel_depth
; /* number of bits per pixel */
718 png_byte spare_byte
; /* to align the data, and for future use */
719 png_byte signature
[8]; /* magic bytes read by libpng from start of file */
721 /* The rest of the data is optional. If you are reading, check the
722 * valid field to see if the information in these are valid. If you
723 * are writing, set the valid field to those chunks you want written,
724 * and initialize the appropriate fields below.
727 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
728 /* The gAMA chunk describes the gamma characteristics of the system
729 * on which the image was created, normally in the range [1.0, 2.5].
730 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
732 float gamma
; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
735 #if defined(PNG_sRGB_SUPPORTED)
737 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
738 png_byte srgb_intent
; /* sRGB rendering intent [0, 1, 2, or 3] */
741 #if defined(PNG_TEXT_SUPPORTED)
742 /* The tEXt, and zTXt chunks contain human-readable textual data in
743 * uncompressed, compressed, and optionally compressed forms, respectively.
744 * The data in "text" is an array of pointers to uncompressed,
745 * null-terminated C strings. Each chunk has a keyword that describes the
746 * textual data contained in that chunk. Keywords are not required to be
747 * unique, and the text string may be empty. Any number of text chunks may
750 int num_text
; /* number of comments read/to write */
751 int max_text
; /* current size of text array */
752 png_textp text
; /* array of comments read/to write */
753 #endif /* PNG_TEXT_SUPPORTED */
755 #if defined(PNG_tIME_SUPPORTED)
756 /* The tIME chunk holds the last time the displayed image data was
757 * modified. See the png_time struct for the contents of this struct.
762 #if defined(PNG_sBIT_SUPPORTED)
763 /* The sBIT chunk specifies the number of significant high-order bits
764 * in the pixel data. Values are in the range [1, bit_depth], and are
765 * only specified for the channels in the pixel data. The contents of
766 * the low-order bits is not specified. Data is valid if
767 * (valid & PNG_INFO_sBIT) is non-zero.
769 png_color_8 sig_bit
; /* significant bits in color channels */
772 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
773 defined(PNG_READ_BACKGROUND_SUPPORTED)
774 /* The tRNS chunk supplies transparency data for paletted images and
775 * other image types that don't need a full alpha channel. There are
776 * "num_trans" transparency values for a paletted image, stored in the
777 * same order as the palette colors, starting from index 0. Values
778 * for the data are in the range [0, 255], ranging from fully transparent
779 * to fully opaque, respectively. For non-paletted images, there is a
780 * single color specified that should be treated as fully transparent.
781 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
783 png_bytep trans
; /* transparent values for paletted image */
784 png_color_16 trans_values
; /* transparent color for non-palette image */
787 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
788 /* The bKGD chunk gives the suggested image background color if the
789 * display program does not have its own background color and the image
790 * is needs to composited onto a background before display. The colors
791 * in "background" are normally in the same color space/depth as the
792 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
794 png_color_16 background
;
797 #if defined(PNG_oFFs_SUPPORTED)
798 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
799 * and downwards from the top-left corner of the display, page, or other
800 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
801 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
803 png_int_32 x_offset
; /* x offset on page */
804 png_int_32 y_offset
; /* y offset on page */
805 png_byte offset_unit_type
; /* offset units type */
808 #if defined(PNG_pHYs_SUPPORTED)
809 /* The pHYs chunk gives the physical pixel density of the image for
810 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
811 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
813 png_uint_32 x_pixels_per_unit
; /* horizontal pixel density */
814 png_uint_32 y_pixels_per_unit
; /* vertical pixel density */
815 png_byte phys_unit_type
; /* resolution type (see PNG_RESOLUTION_ below) */
818 #if defined(PNG_hIST_SUPPORTED)
819 /* The hIST chunk contains the relative frequency or importance of the
820 * various palette entries, so that a viewer can intelligently select a
821 * reduced-color palette, if required. Data is an array of "num_palette"
822 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
828 #ifdef PNG_cHRM_SUPPORTED
829 /* The cHRM chunk describes the CIE color characteristics of the monitor
830 * on which the PNG was created. This data allows the viewer to do gamut
831 * mapping of the input image to ensure that the viewer sees the same
832 * colors in the image as the creator. Values are in the range
833 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
835 #ifdef PNG_FLOATING_POINT_SUPPORTED
847 #if defined(PNG_pCAL_SUPPORTED)
848 /* The pCAL chunk describes a transformation between the stored pixel
849 * values and original physical data values used to create the image.
850 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
851 * range given by [pcal_X0, pcal_X1], and are further transformed by a
852 * (possibly non-linear) transformation function given by "pcal_type"
853 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
854 * defines below, and the PNG-Group's PNG extensions document for a
855 * complete description of the transformations and how they should be
856 * implemented, and for a description of the ASCII parameter strings.
857 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
859 png_charp pcal_purpose
; /* pCAL chunk description string */
860 png_int_32 pcal_X0
; /* minimum value */
861 png_int_32 pcal_X1
; /* maximum value */
862 png_charp pcal_units
; /* Latin-1 string giving physical units */
863 png_charpp pcal_params
; /* ASCII strings containing parameter values */
864 png_byte pcal_type
; /* equation type (see PNG_EQUATION_ below) */
865 png_byte pcal_nparams
; /* number of parameters given in pcal_params */
868 /* New members added in libpng-1.0.6 */
869 #ifdef PNG_FREE_ME_SUPPORTED
870 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
873 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
874 /* storage for unknown chunks that the library doesn't recognize. */
875 png_unknown_chunkp unknown_chunks
;
876 png_size_t unknown_chunks_num
;
879 #if defined(PNG_iCCP_SUPPORTED)
880 /* iCCP chunk data. */
881 png_charp iccp_name
; /* profile name */
882 png_charp iccp_profile
; /* International Color Consortium profile data */
883 /* Note to maintainer: should be png_bytep */
884 png_uint_32 iccp_proflen
; /* ICC profile data length */
885 png_byte iccp_compression
; /* Always zero */
888 #if defined(PNG_sPLT_SUPPORTED)
889 /* data on sPLT chunks (there may be more than one). */
890 png_sPLT_tp splt_palettes
;
891 png_uint_32 splt_palettes_num
;
894 #if defined(PNG_sCAL_SUPPORTED)
895 /* The sCAL chunk describes the actual physical dimensions of the
896 * subject matter of the graphic. The chunk contains a unit specification
897 * a byte value, and two ASCII strings representing floating-point
898 * values. The values are width and height corresponsing to one pixel
899 * in the image. This external representation is converted to double
900 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
902 png_byte scal_unit
; /* unit of physical scale */
903 #ifdef PNG_FLOATING_POINT_SUPPORTED
904 double scal_pixel_width
; /* width of one pixel */
905 double scal_pixel_height
; /* height of one pixel */
907 #ifdef PNG_FIXED_POINT_SUPPORTED
908 png_charp scal_s_width
; /* string containing height */
909 png_charp scal_s_height
; /* string containing width */
913 #if defined(PNG_INFO_IMAGE_SUPPORTED)
914 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
915 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
916 png_bytepp row_pointers
; /* the image bits */
919 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
920 png_fixed_point int_gamma
; /* gamma of image, if (valid & PNG_INFO_gAMA) */
923 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
924 png_fixed_point int_x_white
;
925 png_fixed_point int_y_white
;
926 png_fixed_point int_x_red
;
927 png_fixed_point int_y_red
;
928 png_fixed_point int_x_green
;
929 png_fixed_point int_y_green
;
930 png_fixed_point int_x_blue
;
931 png_fixed_point int_y_blue
;
936 typedef png_info FAR
* png_infop
;
937 typedef png_info FAR
* FAR
* png_infopp
;
939 /* Maximum positive integer used in PNG is (2^31)-1 */
940 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
941 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
942 #define PNG_SIZE_MAX ((png_size_t)(-1))
943 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
944 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
945 #define PNG_MAX_UINT PNG_UINT_31_MAX
948 /* These describe the color_type field in png_info. */
949 /* color type masks */
950 #define PNG_COLOR_MASK_PALETTE 1
951 #define PNG_COLOR_MASK_COLOR 2
952 #define PNG_COLOR_MASK_ALPHA 4
954 /* color types. Note that not all combinations are legal */
955 #define PNG_COLOR_TYPE_GRAY 0
956 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
957 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
958 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
959 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
961 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
962 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
964 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
965 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
966 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
968 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
969 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
970 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
971 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
973 /* These are for the interlacing type. These values should NOT be changed. */
974 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
975 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
976 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
978 /* These are for the oFFs chunk. These values should NOT be changed. */
979 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
980 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
981 #define PNG_OFFSET_LAST 2 /* Not a valid value */
983 /* These are for the pCAL chunk. These values should NOT be changed. */
984 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
985 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
986 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
987 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
988 #define PNG_EQUATION_LAST 4 /* Not a valid value */
990 /* These are for the sCAL chunk. These values should NOT be changed. */
991 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
992 #define PNG_SCALE_METER 1 /* meters per pixel */
993 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
994 #define PNG_SCALE_LAST 3 /* Not a valid value */
996 /* These are for the pHYs chunk. These values should NOT be changed. */
997 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
998 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
999 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1001 /* These are for the sRGB chunk. These values should NOT be changed. */
1002 #define PNG_sRGB_INTENT_PERCEPTUAL 0
1003 #define PNG_sRGB_INTENT_RELATIVE 1
1004 #define PNG_sRGB_INTENT_SATURATION 2
1005 #define PNG_sRGB_INTENT_ABSOLUTE 3
1006 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1008 /* This is for text chunks */
1009 #define PNG_KEYWORD_MAX_LENGTH 79
1011 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1012 #define PNG_MAX_PALETTE_LENGTH 256
1014 /* These determine if an ancillary chunk's data has been successfully read
1015 * from the PNG header, or if the application has filled in the corresponding
1016 * data in the info_struct to be written into the output file. The values
1017 * of the PNG_INFO_<chunk> defines should NOT be changed.
1019 #define PNG_INFO_gAMA 0x0001
1020 #define PNG_INFO_sBIT 0x0002
1021 #define PNG_INFO_cHRM 0x0004
1022 #define PNG_INFO_PLTE 0x0008
1023 #define PNG_INFO_tRNS 0x0010
1024 #define PNG_INFO_bKGD 0x0020
1025 #define PNG_INFO_hIST 0x0040
1026 #define PNG_INFO_pHYs 0x0080
1027 #define PNG_INFO_oFFs 0x0100
1028 #define PNG_INFO_tIME 0x0200
1029 #define PNG_INFO_pCAL 0x0400
1030 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1031 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1032 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1033 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1034 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1036 /* This is used for the transformation routines, as some of them
1037 * change these values for the row. It also should enable using
1038 * the routines for other purposes.
1040 typedef struct png_row_info_struct
1042 png_uint_32 width
; /* width of row */
1043 png_uint_32 rowbytes
; /* number of bytes in row */
1044 png_byte color_type
; /* color type of row */
1045 png_byte bit_depth
; /* bit depth of row */
1046 png_byte channels
; /* number of channels (1, 2, 3, or 4) */
1047 png_byte pixel_depth
; /* bits per pixel (depth * channels) */
1050 typedef png_row_info FAR
* png_row_infop
;
1051 typedef png_row_info FAR
* FAR
* png_row_infopp
;
1053 /* These are the function types for the I/O functions and for the functions
1054 * that allow the user to override the default I/O functions with his or her
1055 * own. The png_error_ptr type should match that of user-supplied warning
1056 * and error functions, while the png_rw_ptr type should match that of the
1057 * user read/write data functions.
1059 typedef struct png_struct_def png_struct
;
1060 typedef png_struct FAR
* png_structp
;
1062 typedef void (PNGAPI
*png_error_ptr
) PNGARG((png_structp
, png_const_charp
));
1063 typedef void (PNGAPI
*png_rw_ptr
) PNGARG((png_structp
, png_bytep
, png_size_t
));
1064 typedef void (PNGAPI
*png_flush_ptr
) PNGARG((png_structp
));
1065 typedef void (PNGAPI
*png_read_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1067 typedef void (PNGAPI
*png_write_status_ptr
) PNGARG((png_structp
, png_uint_32
,
1070 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1071 typedef void (PNGAPI
*png_progressive_info_ptr
) PNGARG((png_structp
, png_infop
));
1072 typedef void (PNGAPI
*png_progressive_end_ptr
) PNGARG((png_structp
, png_infop
));
1073 typedef void (PNGAPI
*png_progressive_row_ptr
) PNGARG((png_structp
, png_bytep
,
1077 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1078 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1079 defined(PNG_LEGACY_SUPPORTED)
1080 typedef void (PNGAPI
*png_user_transform_ptr
) PNGARG((png_structp
,
1081 png_row_infop
, png_bytep
));
1084 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1085 typedef int (PNGAPI
*png_user_chunk_ptr
) PNGARG((png_structp
, png_unknown_chunkp
));
1087 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1088 typedef void (PNGAPI
*png_unknown_chunk_ptr
) PNGARG((png_structp
));
1091 /* Transform masks for the high-level interface */
1092 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1093 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1094 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1095 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1096 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1097 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1098 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1099 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1100 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1101 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1102 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1103 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1104 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1106 /* Flags for MNG supported features */
1107 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1108 #define PNG_FLAG_MNG_FILTER_64 0x04
1109 #define PNG_ALL_MNG_FEATURES 0x05
1111 typedef png_voidp (*png_malloc_ptr
) PNGARG((png_structp
, png_size_t
));
1112 typedef void (*png_free_ptr
) PNGARG((png_structp
, png_voidp
));
1114 /* The structure that holds the information to read and write PNG files.
1115 * The only people who need to care about what is inside of this are the
1116 * people who will be modifying the library for their own special needs.
1117 * It should NOT be accessed directly by an application, except to store
1121 struct png_struct_def
1123 #ifdef PNG_SETJMP_SUPPORTED
1124 jmp_buf jmpbuf
; /* used in png_error */
1126 png_error_ptr error_fn
; /* function for printing errors and aborting */
1127 png_error_ptr warning_fn
; /* function for printing warnings */
1128 png_voidp error_ptr
; /* user supplied struct for error functions */
1129 png_rw_ptr write_data_fn
; /* function for writing output data */
1130 png_rw_ptr read_data_fn
; /* function for reading input data */
1131 png_voidp io_ptr
; /* ptr to application struct for I/O functions */
1133 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1134 png_user_transform_ptr read_user_transform_fn
; /* user read transform */
1137 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1138 png_user_transform_ptr write_user_transform_fn
; /* user write transform */
1141 /* These were added in libpng-1.0.2 */
1142 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1143 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1144 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1145 png_voidp user_transform_ptr
; /* user supplied struct for user transform */
1146 png_byte user_transform_depth
; /* bit depth of user transformed pixels */
1147 png_byte user_transform_channels
; /* channels in user transformed pixels */
1151 png_uint_32 mode
; /* tells us where we are in the PNG file */
1152 png_uint_32 flags
; /* flags indicating various things to libpng */
1153 png_uint_32 transformations
; /* which transformations to perform */
1155 z_stream zstream
; /* pointer to decompression structure (below) */
1156 png_bytep zbuf
; /* buffer for zlib */
1157 png_size_t zbuf_size
; /* size of zbuf */
1158 int zlib_level
; /* holds zlib compression level */
1159 int zlib_method
; /* holds zlib compression method */
1160 int zlib_window_bits
; /* holds zlib compression window bits */
1161 int zlib_mem_level
; /* holds zlib compression memory level */
1162 int zlib_strategy
; /* holds zlib compression strategy */
1164 png_uint_32 width
; /* width of image in pixels */
1165 png_uint_32 height
; /* height of image in pixels */
1166 png_uint_32 num_rows
; /* number of rows in current pass */
1167 png_uint_32 usr_width
; /* width of row at start of write */
1168 png_uint_32 rowbytes
; /* size of row in bytes */
1169 png_uint_32 irowbytes
; /* size of current interlaced row in bytes */
1170 png_uint_32 iwidth
; /* width of current interlaced row in pixels */
1171 png_uint_32 row_number
; /* current row in interlace pass */
1172 png_bytep prev_row
; /* buffer to save previous (unfiltered) row */
1173 png_bytep row_buf
; /* buffer to save current (unfiltered) row */
1174 png_bytep sub_row
; /* buffer to save "sub" row when filtering */
1175 png_bytep up_row
; /* buffer to save "up" row when filtering */
1176 png_bytep avg_row
; /* buffer to save "avg" row when filtering */
1177 png_bytep paeth_row
; /* buffer to save "Paeth" row when filtering */
1178 png_row_info row_info
; /* used for transformation routines */
1180 png_uint_32 idat_size
; /* current IDAT size for read */
1181 png_uint_32 crc
; /* current chunk CRC value */
1182 png_colorp palette
; /* palette from the input file */
1183 png_uint_16 num_palette
; /* number of color entries in palette */
1184 png_uint_16 num_trans
; /* number of transparency values */
1185 png_byte chunk_name
[5]; /* null-terminated name of current chunk */
1186 png_byte compression
; /* file compression type (always 0) */
1187 png_byte filter
; /* file filter type (always 0) */
1188 png_byte interlaced
; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1189 png_byte pass
; /* current interlace pass (0 - 6) */
1190 png_byte do_filter
; /* row filter flags (see PNG_FILTER_ below ) */
1191 png_byte color_type
; /* color type of file */
1192 png_byte bit_depth
; /* bit depth of file */
1193 png_byte usr_bit_depth
; /* bit depth of users row */
1194 png_byte pixel_depth
; /* number of bits per pixel */
1195 png_byte channels
; /* number of channels in file */
1196 png_byte usr_channels
; /* channels at start of write */
1197 png_byte sig_bytes
; /* magic bytes read/written from start of file */
1199 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1200 #ifdef PNG_LEGACY_SUPPORTED
1201 png_byte filler
; /* filler byte for pixel expansion */
1203 png_uint_16 filler
; /* filler bytes for pixel expansion */
1207 #if defined(PNG_bKGD_SUPPORTED)
1208 png_byte background_gamma_type
;
1209 # ifdef PNG_FLOATING_POINT_SUPPORTED
1210 float background_gamma
;
1212 png_color_16 background
; /* background color in screen gamma space */
1213 #if defined(PNG_READ_GAMMA_SUPPORTED)
1214 png_color_16 background_1
; /* background normalized to gamma 1.0 */
1216 #endif /* PNG_bKGD_SUPPORTED */
1218 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1219 png_flush_ptr output_flush_fn
;/* Function for flushing output */
1220 png_uint_32 flush_dist
; /* how many rows apart to flush, 0 - no flush */
1221 png_uint_32 flush_rows
; /* number of rows written since last flush */
1224 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1225 int gamma_shift
; /* number of "insignificant" bits 16-bit gamma */
1226 #ifdef PNG_FLOATING_POINT_SUPPORTED
1227 float gamma
; /* file gamma value */
1228 float screen_gamma
; /* screen gamma value (display_exponent) */
1232 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1233 png_bytep gamma_table
; /* gamma table for 8-bit depth files */
1234 png_bytep gamma_from_1
; /* converts from 1.0 to screen */
1235 png_bytep gamma_to_1
; /* converts from file to 1.0 */
1236 png_uint_16pp gamma_16_table
; /* gamma table for 16-bit depth files */
1237 png_uint_16pp gamma_16_from_1
; /* converts from 1.0 to screen */
1238 png_uint_16pp gamma_16_to_1
; /* converts from file to 1.0 */
1241 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1242 png_color_8 sig_bit
; /* significant bits in each available channel */
1245 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1246 png_color_8 shift
; /* shift for significant bit tranformation */
1249 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1250 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1251 png_bytep trans
; /* transparency values for paletted files */
1252 png_color_16 trans_values
; /* transparency values for non-paletted files */
1255 png_read_status_ptr read_row_fn
; /* called after each row is decoded */
1256 png_write_status_ptr write_row_fn
; /* called after each row is encoded */
1257 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1258 png_progressive_info_ptr info_fn
; /* called after header data fully read */
1259 png_progressive_row_ptr row_fn
; /* called after each prog. row is decoded */
1260 png_progressive_end_ptr end_fn
; /* called after image is complete */
1261 png_bytep save_buffer_ptr
; /* current location in save_buffer */
1262 png_bytep save_buffer
; /* buffer for previously read data */
1263 png_bytep current_buffer_ptr
; /* current location in current_buffer */
1264 png_bytep current_buffer
; /* buffer for recently used data */
1265 png_uint_32 push_length
; /* size of current input chunk */
1266 png_uint_32 skip_length
; /* bytes to skip in input data */
1267 png_size_t save_buffer_size
; /* amount of data now in save_buffer */
1268 png_size_t save_buffer_max
; /* total size of save_buffer */
1269 png_size_t buffer_size
; /* total amount of available input data */
1270 png_size_t current_buffer_size
; /* amount of data now in current_buffer */
1271 int process_mode
; /* what push library is currently doing */
1272 int cur_palette
; /* current push library palette index */
1274 # if defined(PNG_TEXT_SUPPORTED)
1275 png_size_t current_text_size
; /* current size of text input data */
1276 png_size_t current_text_left
; /* how much text left to read in input */
1277 png_charp current_text
; /* current text chunk buffer */
1278 png_charp current_text_ptr
; /* current location in current_text */
1279 # endif /* PNG_TEXT_SUPPORTED */
1280 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1282 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1283 /* for the Borland special 64K segment handler */
1284 png_bytepp offset_table_ptr
;
1285 png_bytep offset_table
;
1286 png_uint_16 offset_table_number
;
1287 png_uint_16 offset_table_count
;
1288 png_uint_16 offset_table_count_free
;
1291 #if defined(PNG_READ_DITHER_SUPPORTED)
1292 png_bytep palette_lookup
; /* lookup table for dithering */
1293 png_bytep dither_index
; /* index translation for palette files */
1296 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1297 png_uint_16p hist
; /* histogram */
1300 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1301 png_byte heuristic_method
; /* heuristic for row filter selection */
1302 png_byte num_prev_filters
; /* number of weights for previous rows */
1303 png_bytep prev_filters
; /* filter type(s) of previous row(s) */
1304 png_uint_16p filter_weights
; /* weight(s) for previous line(s) */
1305 png_uint_16p inv_filter_weights
; /* 1/weight(s) for previous line(s) */
1306 png_uint_16p filter_costs
; /* relative filter calculation cost */
1307 png_uint_16p inv_filter_costs
; /* 1/relative filter calculation cost */
1310 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1311 png_charp time_buffer
; /* String to hold RFC 1123 time text */
1314 /* New members added in libpng-1.0.6 */
1316 #ifdef PNG_FREE_ME_SUPPORTED
1317 png_uint_32 free_me
; /* flags items libpng is responsible for freeing */
1320 #if defined(PNG_USER_CHUNKS_SUPPORTED)
1321 png_voidp user_chunk_ptr
;
1322 png_user_chunk_ptr read_user_chunk_fn
; /* user read chunk handler */
1325 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1327 png_bytep chunk_list
;
1330 /* New members added in libpng-1.0.3 */
1331 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1332 png_byte rgb_to_gray_status
;
1333 /* These were changed from png_byte in libpng-1.0.6 */
1334 png_uint_16 rgb_to_gray_red_coeff
;
1335 png_uint_16 rgb_to_gray_green_coeff
;
1336 png_uint_16 rgb_to_gray_blue_coeff
;
1339 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1340 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1341 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1342 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1343 /* changed from png_byte to png_uint_32 at version 1.2.0 */
1345 png_byte mng_features_permitted
;
1347 png_uint_32 mng_features_permitted
;
1348 #endif /* PNG_1_0_X */
1351 /* New member added in libpng-1.0.7 */
1352 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1353 png_fixed_point int_gamma
;
1356 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1357 #if defined(PNG_MNG_FEATURES_SUPPORTED)
1358 png_byte filter_type
;
1361 #if defined(PNG_1_0_X)
1362 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1363 png_uint_32 row_buf_size
;
1366 /* New members added in libpng-1.2.0 */
1367 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1368 # if !defined(PNG_1_0_X)
1369 # if defined(PNG_MMX_CODE_SUPPORTED)
1370 png_byte mmx_bitdepth_threshold
;
1371 png_uint_32 mmx_rowbytes_threshold
;
1373 png_uint_32 asm_flags
;
1377 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1378 #ifdef PNG_USER_MEM_SUPPORTED
1379 png_voidp mem_ptr
; /* user supplied struct for mem functions */
1380 png_malloc_ptr malloc_fn
; /* function for allocating memory */
1381 png_free_ptr free_fn
; /* function for freeing memory */
1384 /* New member added in libpng-1.0.13 and 1.2.0 */
1385 png_bytep big_row_buf
; /* buffer to save current (unfiltered) row */
1387 #if defined(PNG_READ_DITHER_SUPPORTED)
1388 /* The following three members were added at version 1.0.14 and 1.2.4 */
1389 png_bytep dither_sort
; /* working sort array */
1390 png_bytep index_to_palette
; /* where the original index currently is */
1391 /* in the palette */
1392 png_bytep palette_to_index
; /* which original index points to this */
1396 /* New members added in libpng-1.0.16 and 1.2.6 */
1397 png_byte compression_type
;
1399 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
1400 png_uint_32 user_width_max
;
1401 png_uint_32 user_height_max
;
1404 /* New member added in libpng-1.0.25 and 1.2.17 */
1405 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1406 /* storage for unknown chunk that the library doesn't recognize. */
1407 png_unknown_chunk unknown_chunk
;
1412 /* This triggers a compiler error in png.c, if png.c and png.h
1413 * do not agree upon the version number.
1415 typedef png_structp version_1_2_20
;
1417 typedef png_struct FAR
* FAR
* png_structpp
;
1419 /* Here are the function definitions most commonly used. This is not
1420 * the place to find out how to use libpng. See libpng.txt for the
1421 * full explanation, see example.c for the summary. This just provides
1422 * a simple one line description of the use of each function.
1425 /* Returns the version number of the library */
1426 extern PNG_EXPORT(png_uint_32
,png_access_version_number
) PNGARG((void));
1428 /* Tell lib we have already handled the first <num_bytes> magic bytes.
1429 * Handling more than 8 bytes from the beginning of the file is an error.
1431 extern PNG_EXPORT(void,png_set_sig_bytes
) PNGARG((png_structp png_ptr
,
1434 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1435 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1436 * signature, and non-zero otherwise. Having num_to_check == 0 or
1437 * start > 7 will always fail (ie return non-zero).
1439 extern PNG_EXPORT(int,png_sig_cmp
) PNGARG((png_bytep sig
, png_size_t start
,
1440 png_size_t num_to_check
));
1442 /* Simple signature checking function. This is the same as calling
1443 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1445 extern PNG_EXPORT(int,png_check_sig
) PNGARG((png_bytep sig
, int num
));
1447 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
1448 extern PNG_EXPORT(png_structp
,png_create_read_struct
)
1449 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1450 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1452 /* Allocate and initialize png_ptr struct for writing, and any other memory */
1453 extern PNG_EXPORT(png_structp
,png_create_write_struct
)
1454 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1455 png_error_ptr error_fn
, png_error_ptr warn_fn
));
1457 #ifdef PNG_WRITE_SUPPORTED
1458 extern PNG_EXPORT(png_uint_32
,png_get_compression_buffer_size
)
1459 PNGARG((png_structp png_ptr
));
1462 #ifdef PNG_WRITE_SUPPORTED
1463 extern PNG_EXPORT(void,png_set_compression_buffer_size
)
1464 PNGARG((png_structp png_ptr
, png_uint_32 size
));
1467 /* Reset the compression stream */
1468 extern PNG_EXPORT(int,png_reset_zstream
) PNGARG((png_structp png_ptr
));
1470 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1471 #ifdef PNG_USER_MEM_SUPPORTED
1472 extern PNG_EXPORT(png_structp
,png_create_read_struct_2
)
1473 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1474 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1475 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1476 extern PNG_EXPORT(png_structp
,png_create_write_struct_2
)
1477 PNGARG((png_const_charp user_png_ver
, png_voidp error_ptr
,
1478 png_error_ptr error_fn
, png_error_ptr warn_fn
, png_voidp mem_ptr
,
1479 png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1482 /* Write a PNG chunk - size, type, (optional) data, CRC. */
1483 extern PNG_EXPORT(void,png_write_chunk
) PNGARG((png_structp png_ptr
,
1484 png_bytep chunk_name
, png_bytep data
, png_size_t length
));
1486 /* Write the start of a PNG chunk - length and chunk name. */
1487 extern PNG_EXPORT(void,png_write_chunk_start
) PNGARG((png_structp png_ptr
,
1488 png_bytep chunk_name
, png_uint_32 length
));
1490 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
1491 extern PNG_EXPORT(void,png_write_chunk_data
) PNGARG((png_structp png_ptr
,
1492 png_bytep data
, png_size_t length
));
1494 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1495 extern PNG_EXPORT(void,png_write_chunk_end
) PNGARG((png_structp png_ptr
));
1497 /* Allocate and initialize the info structure */
1498 extern PNG_EXPORT(png_infop
,png_create_info_struct
)
1499 PNGARG((png_structp png_ptr
));
1501 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1502 /* Initialize the info structure (old interface - DEPRECATED) */
1503 extern PNG_EXPORT(void,png_info_init
) PNGARG((png_infop info_ptr
));
1504 #undef png_info_init
1505 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1506 png_sizeof(png_info));
1509 extern PNG_EXPORT(void,png_info_init_3
) PNGARG((png_infopp info_ptr
,
1510 png_size_t png_info_struct_size
));
1512 /* Writes all the PNG information before the image. */
1513 extern PNG_EXPORT(void,png_write_info_before_PLTE
) PNGARG((png_structp png_ptr
,
1514 png_infop info_ptr
));
1515 extern PNG_EXPORT(void,png_write_info
) PNGARG((png_structp png_ptr
,
1516 png_infop info_ptr
));
1518 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1519 /* read the information before the actual image data. */
1520 extern PNG_EXPORT(void,png_read_info
) PNGARG((png_structp png_ptr
,
1521 png_infop info_ptr
));
1524 #if defined(PNG_TIME_RFC1123_SUPPORTED)
1525 extern PNG_EXPORT(png_charp
,png_convert_to_rfc1123
)
1526 PNGARG((png_structp png_ptr
, png_timep ptime
));
1529 #if !defined(_WIN32_WCE)
1530 /* "time.h" functions are not supported on WindowsCE */
1531 #if defined(PNG_WRITE_tIME_SUPPORTED)
1532 /* convert from a struct tm to png_time */
1533 extern PNG_EXPORT(void,png_convert_from_struct_tm
) PNGARG((png_timep ptime
,
1534 struct tm FAR
* ttime
));
1536 /* convert from time_t to png_time. Uses gmtime() */
1537 extern PNG_EXPORT(void,png_convert_from_time_t
) PNGARG((png_timep ptime
,
1539 #endif /* PNG_WRITE_tIME_SUPPORTED */
1540 #endif /* _WIN32_WCE */
1542 #if defined(PNG_READ_EXPAND_SUPPORTED)
1543 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1544 extern PNG_EXPORT(void,png_set_expand
) PNGARG((png_structp png_ptr
));
1545 #if !defined(PNG_1_0_X)
1546 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8
) PNGARG((png_structp
1549 extern PNG_EXPORT(void,png_set_palette_to_rgb
) PNGARG((png_structp png_ptr
));
1550 extern PNG_EXPORT(void,png_set_tRNS_to_alpha
) PNGARG((png_structp png_ptr
));
1551 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1553 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8
) PNGARG((png_structp png_ptr
));
1557 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1558 /* Use blue, green, red order for pixels. */
1559 extern PNG_EXPORT(void,png_set_bgr
) PNGARG((png_structp png_ptr
));
1562 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1563 /* Expand the grayscale to 24-bit RGB if necessary. */
1564 extern PNG_EXPORT(void,png_set_gray_to_rgb
) PNGARG((png_structp png_ptr
));
1567 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1568 /* Reduce RGB to grayscale. */
1569 #ifdef PNG_FLOATING_POINT_SUPPORTED
1570 extern PNG_EXPORT(void,png_set_rgb_to_gray
) PNGARG((png_structp png_ptr
,
1571 int error_action
, double red
, double green
));
1573 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed
) PNGARG((png_structp png_ptr
,
1574 int error_action
, png_fixed_point red
, png_fixed_point green
));
1575 extern PNG_EXPORT(png_byte
,png_get_rgb_to_gray_status
) PNGARG((png_structp
1579 extern PNG_EXPORT(void,png_build_grayscale_palette
) PNGARG((int bit_depth
,
1580 png_colorp palette
));
1582 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1583 extern PNG_EXPORT(void,png_set_strip_alpha
) PNGARG((png_structp png_ptr
));
1586 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1587 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1588 extern PNG_EXPORT(void,png_set_swap_alpha
) PNGARG((png_structp png_ptr
));
1591 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1592 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1593 extern PNG_EXPORT(void,png_set_invert_alpha
) PNGARG((png_structp png_ptr
));
1596 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1597 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1598 extern PNG_EXPORT(void,png_set_filler
) PNGARG((png_structp png_ptr
,
1599 png_uint_32 filler
, int flags
));
1600 /* The values of the PNG_FILLER_ defines should NOT be changed */
1601 #define PNG_FILLER_BEFORE 0
1602 #define PNG_FILLER_AFTER 1
1603 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1604 #if !defined(PNG_1_0_X)
1605 extern PNG_EXPORT(void,png_set_add_alpha
) PNGARG((png_structp png_ptr
,
1606 png_uint_32 filler
, int flags
));
1608 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1610 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1611 /* Swap bytes in 16-bit depth files. */
1612 extern PNG_EXPORT(void,png_set_swap
) PNGARG((png_structp png_ptr
));
1615 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1616 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1617 extern PNG_EXPORT(void,png_set_packing
) PNGARG((png_structp png_ptr
));
1620 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1621 /* Swap packing order of pixels in bytes. */
1622 extern PNG_EXPORT(void,png_set_packswap
) PNGARG((png_structp png_ptr
));
1625 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1626 /* Converts files to legal bit depths. */
1627 extern PNG_EXPORT(void,png_set_shift
) PNGARG((png_structp png_ptr
,
1628 png_color_8p true_bits
));
1631 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1632 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1633 /* Have the code handle the interlacing. Returns the number of passes. */
1634 extern PNG_EXPORT(int,png_set_interlace_handling
) PNGARG((png_structp png_ptr
));
1637 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1638 /* Invert monochrome files */
1639 extern PNG_EXPORT(void,png_set_invert_mono
) PNGARG((png_structp png_ptr
));
1642 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
1643 /* Handle alpha and tRNS by replacing with a background color. */
1644 #ifdef PNG_FLOATING_POINT_SUPPORTED
1645 extern PNG_EXPORT(void,png_set_background
) PNGARG((png_structp png_ptr
,
1646 png_color_16p background_color
, int background_gamma_code
,
1647 int need_expand
, double background_gamma
));
1649 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1650 #define PNG_BACKGROUND_GAMMA_SCREEN 1
1651 #define PNG_BACKGROUND_GAMMA_FILE 2
1652 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
1655 #if defined(PNG_READ_16_TO_8_SUPPORTED)
1656 /* strip the second byte of information from a 16-bit depth file. */
1657 extern PNG_EXPORT(void,png_set_strip_16
) PNGARG((png_structp png_ptr
));
1660 #if defined(PNG_READ_DITHER_SUPPORTED)
1661 /* Turn on dithering, and reduce the palette to the number of colors available. */
1662 extern PNG_EXPORT(void,png_set_dither
) PNGARG((png_structp png_ptr
,
1663 png_colorp palette
, int num_palette
, int maximum_colors
,
1664 png_uint_16p histogram
, int full_dither
));
1667 #if defined(PNG_READ_GAMMA_SUPPORTED)
1668 /* Handle gamma correction. Screen_gamma=(display_exponent) */
1669 #ifdef PNG_FLOATING_POINT_SUPPORTED
1670 extern PNG_EXPORT(void,png_set_gamma
) PNGARG((png_structp png_ptr
,
1671 double screen_gamma
, double default_file_gamma
));
1675 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1676 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1677 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1678 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1679 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1680 extern PNG_EXPORT(void,png_permit_empty_plte
) PNGARG((png_structp png_ptr
,
1681 int empty_plte_permitted
));
1685 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
1686 /* Set how many lines between output flushes - 0 for no flushing */
1687 extern PNG_EXPORT(void,png_set_flush
) PNGARG((png_structp png_ptr
, int nrows
));
1688 /* Flush the current PNG output buffer */
1689 extern PNG_EXPORT(void,png_write_flush
) PNGARG((png_structp png_ptr
));
1692 /* optional update palette with requested transformations */
1693 extern PNG_EXPORT(void,png_start_read_image
) PNGARG((png_structp png_ptr
));
1695 /* optional call to update the users info structure */
1696 extern PNG_EXPORT(void,png_read_update_info
) PNGARG((png_structp png_ptr
,
1697 png_infop info_ptr
));
1699 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1700 /* read one or more rows of image data. */
1701 extern PNG_EXPORT(void,png_read_rows
) PNGARG((png_structp png_ptr
,
1702 png_bytepp row
, png_bytepp display_row
, png_uint_32 num_rows
));
1705 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1706 /* read a row of data. */
1707 extern PNG_EXPORT(void,png_read_row
) PNGARG((png_structp png_ptr
,
1709 png_bytep display_row
));
1712 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1713 /* read the whole image into memory at once. */
1714 extern PNG_EXPORT(void,png_read_image
) PNGARG((png_structp png_ptr
,
1718 /* write a row of image data */
1719 extern PNG_EXPORT(void,png_write_row
) PNGARG((png_structp png_ptr
,
1722 /* write a few rows of image data */
1723 extern PNG_EXPORT(void,png_write_rows
) PNGARG((png_structp png_ptr
,
1724 png_bytepp row
, png_uint_32 num_rows
));
1726 /* write the image data */
1727 extern PNG_EXPORT(void,png_write_image
) PNGARG((png_structp png_ptr
,
1730 /* writes the end of the PNG file. */
1731 extern PNG_EXPORT(void,png_write_end
) PNGARG((png_structp png_ptr
,
1732 png_infop info_ptr
));
1734 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1735 /* read the end of the PNG file. */
1736 extern PNG_EXPORT(void,png_read_end
) PNGARG((png_structp png_ptr
,
1737 png_infop info_ptr
));
1740 /* free any memory associated with the png_info_struct */
1741 extern PNG_EXPORT(void,png_destroy_info_struct
) PNGARG((png_structp png_ptr
,
1742 png_infopp info_ptr_ptr
));
1744 /* free any memory associated with the png_struct and the png_info_structs */
1745 extern PNG_EXPORT(void,png_destroy_read_struct
) PNGARG((png_structpp
1746 png_ptr_ptr
, png_infopp info_ptr_ptr
, png_infopp end_info_ptr_ptr
));
1748 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
1749 extern void png_read_destroy
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
1750 png_infop end_info_ptr
));
1752 /* free any memory associated with the png_struct and the png_info_structs */
1753 extern PNG_EXPORT(void,png_destroy_write_struct
)
1754 PNGARG((png_structpp png_ptr_ptr
, png_infopp info_ptr_ptr
));
1756 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1757 extern void png_write_destroy
PNGARG((png_structp png_ptr
));
1759 /* set the libpng method of handling chunk CRC errors */
1760 extern PNG_EXPORT(void,png_set_crc_action
) PNGARG((png_structp png_ptr
,
1761 int crit_action
, int ancil_action
));
1763 /* Values for png_set_crc_action() to say how to handle CRC errors in
1764 * ancillary and critical chunks, and whether to use the data contained
1765 * therein. Note that it is impossible to "discard" data in a critical
1766 * chunk. For versions prior to 0.90, the action was always error/quit,
1767 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1768 * chunks is warn/discard. These values should NOT be changed.
1770 * value action:critical action:ancillary
1772 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1773 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1774 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1775 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1776 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1777 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1779 /* These functions give the user control over the scan-line filtering in
1780 * libpng and the compression methods used by zlib. These functions are
1781 * mainly useful for testing, as the defaults should work with most users.
1782 * Those users who are tight on memory or want faster performance at the
1783 * expense of compression can modify them. See the compression library
1784 * header file (zlib.h) for an explination of the compression functions.
1787 /* set the filtering method(s) used by libpng. Currently, the only valid
1788 * value for "method" is 0.
1790 extern PNG_EXPORT(void,png_set_filter
) PNGARG((png_structp png_ptr
, int method
,
1793 /* Flags for png_set_filter() to say which filters to use. The flags
1794 * are chosen so that they don't conflict with real filter types
1795 * below, in case they are supplied instead of the #defined constants.
1796 * These values should NOT be changed.
1798 #define PNG_NO_FILTERS 0x00
1799 #define PNG_FILTER_NONE 0x08
1800 #define PNG_FILTER_SUB 0x10
1801 #define PNG_FILTER_UP 0x20
1802 #define PNG_FILTER_AVG 0x40
1803 #define PNG_FILTER_PAETH 0x80
1804 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1805 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1807 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1808 * These defines should NOT be changed.
1810 #define PNG_FILTER_VALUE_NONE 0
1811 #define PNG_FILTER_VALUE_SUB 1
1812 #define PNG_FILTER_VALUE_UP 2
1813 #define PNG_FILTER_VALUE_AVG 3
1814 #define PNG_FILTER_VALUE_PAETH 4
1815 #define PNG_FILTER_VALUE_LAST 5
1817 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1818 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1819 * defines, either the default (minimum-sum-of-absolute-differences), or
1820 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1822 * Weights are factors >= 1.0, indicating how important it is to keep the
1823 * filter type consistent between rows. Larger numbers mean the current
1824 * filter is that many times as likely to be the same as the "num_weights"
1825 * previous filters. This is cumulative for each previous row with a weight.
1826 * There needs to be "num_weights" values in "filter_weights", or it can be
1827 * NULL if the weights aren't being specified. Weights have no influence on
1828 * the selection of the first row filter. Well chosen weights can (in theory)
1829 * improve the compression for a given image.
1831 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1832 * filter type. Higher costs indicate more decoding expense, and are
1833 * therefore less likely to be selected over a filter with lower computational
1834 * costs. There needs to be a value in "filter_costs" for each valid filter
1835 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1836 * setting the costs. Costs try to improve the speed of decompression without
1837 * unduly increasing the compressed image size.
1839 * A negative weight or cost indicates the default value is to be used, and
1840 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1841 * The default values for both weights and costs are currently 1.0, but may
1842 * change if good general weighting/cost heuristics can be found. If both
1843 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1844 * to the UNWEIGHTED method, but with added encoding time/computation.
1846 #ifdef PNG_FLOATING_POINT_SUPPORTED
1847 extern PNG_EXPORT(void,png_set_filter_heuristics
) PNGARG((png_structp png_ptr
,
1848 int heuristic_method
, int num_weights
, png_doublep filter_weights
,
1849 png_doublep filter_costs
));
1851 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1853 /* Heuristic used for row filter selection. These defines should NOT be
1856 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1857 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1858 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1859 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1861 /* Set the library compression level. Currently, valid values range from
1862 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1863 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1864 * shown that zlib compression levels 3-6 usually perform as well as level 9
1865 * for PNG images, and do considerably fewer caclulations. In the future,
1866 * these values may not correspond directly to the zlib compression levels.
1868 extern PNG_EXPORT(void,png_set_compression_level
) PNGARG((png_structp png_ptr
,
1871 extern PNG_EXPORT(void,png_set_compression_mem_level
)
1872 PNGARG((png_structp png_ptr
, int mem_level
));
1874 extern PNG_EXPORT(void,png_set_compression_strategy
)
1875 PNGARG((png_structp png_ptr
, int strategy
));
1877 extern PNG_EXPORT(void,png_set_compression_window_bits
)
1878 PNGARG((png_structp png_ptr
, int window_bits
));
1880 extern PNG_EXPORT(void,png_set_compression_method
) PNGARG((png_structp png_ptr
,
1883 /* These next functions are called for input/output, memory, and error
1884 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1885 * and call standard C I/O routines such as fread(), fwrite(), and
1886 * fprintf(). These functions can be made to use other I/O routines
1887 * at run time for those applications that need to handle I/O in a
1888 * different manner by calling png_set_???_fn(). See libpng.txt for
1892 #if !defined(PNG_NO_STDIO)
1893 /* Initialize the input/output for the PNG file to the default functions. */
1894 extern PNG_EXPORT(void,png_init_io
) PNGARG((png_structp png_ptr
, png_FILE_p fp
));
1897 /* Replace the (error and abort), and warning functions with user
1898 * supplied functions. If no messages are to be printed you must still
1899 * write and use replacement functions. The replacement error_fn should
1900 * still do a longjmp to the last setjmp location if you are using this
1901 * method of error handling. If error_fn or warning_fn is NULL, the
1902 * default function will be used.
1905 extern PNG_EXPORT(void,png_set_error_fn
) PNGARG((png_structp png_ptr
,
1906 png_voidp error_ptr
, png_error_ptr error_fn
, png_error_ptr warning_fn
));
1908 /* Return the user pointer associated with the error functions */
1909 extern PNG_EXPORT(png_voidp
,png_get_error_ptr
) PNGARG((png_structp png_ptr
));
1911 /* Replace the default data output functions with a user supplied one(s).
1912 * If buffered output is not used, then output_flush_fn can be set to NULL.
1913 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1914 * output_flush_fn will be ignored (and thus can be NULL).
1916 extern PNG_EXPORT(void,png_set_write_fn
) PNGARG((png_structp png_ptr
,
1917 png_voidp io_ptr
, png_rw_ptr write_data_fn
, png_flush_ptr output_flush_fn
));
1919 /* Replace the default data input function with a user supplied one. */
1920 extern PNG_EXPORT(void,png_set_read_fn
) PNGARG((png_structp png_ptr
,
1921 png_voidp io_ptr
, png_rw_ptr read_data_fn
));
1923 /* Return the user pointer associated with the I/O functions */
1924 extern PNG_EXPORT(png_voidp
,png_get_io_ptr
) PNGARG((png_structp png_ptr
));
1926 extern PNG_EXPORT(void,png_set_read_status_fn
) PNGARG((png_structp png_ptr
,
1927 png_read_status_ptr read_row_fn
));
1929 extern PNG_EXPORT(void,png_set_write_status_fn
) PNGARG((png_structp png_ptr
,
1930 png_write_status_ptr write_row_fn
));
1932 #ifdef PNG_USER_MEM_SUPPORTED
1933 /* Replace the default memory allocation functions with user supplied one(s). */
1934 extern PNG_EXPORT(void,png_set_mem_fn
) PNGARG((png_structp png_ptr
,
1935 png_voidp mem_ptr
, png_malloc_ptr malloc_fn
, png_free_ptr free_fn
));
1936 /* Return the user pointer associated with the memory functions */
1937 extern PNG_EXPORT(png_voidp
,png_get_mem_ptr
) PNGARG((png_structp png_ptr
));
1940 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1941 defined(PNG_LEGACY_SUPPORTED)
1942 extern PNG_EXPORT(void,png_set_read_user_transform_fn
) PNGARG((png_structp
1943 png_ptr
, png_user_transform_ptr read_user_transform_fn
));
1946 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1947 defined(PNG_LEGACY_SUPPORTED)
1948 extern PNG_EXPORT(void,png_set_write_user_transform_fn
) PNGARG((png_structp
1949 png_ptr
, png_user_transform_ptr write_user_transform_fn
));
1952 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1953 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1954 defined(PNG_LEGACY_SUPPORTED)
1955 extern PNG_EXPORT(void,png_set_user_transform_info
) PNGARG((png_structp
1956 png_ptr
, png_voidp user_transform_ptr
, int user_transform_depth
,
1957 int user_transform_channels
));
1958 /* Return the user pointer associated with the user transform functions */
1959 extern PNG_EXPORT(png_voidp
,png_get_user_transform_ptr
)
1960 PNGARG((png_structp png_ptr
));
1963 #ifdef PNG_USER_CHUNKS_SUPPORTED
1964 extern PNG_EXPORT(void,png_set_read_user_chunk_fn
) PNGARG((png_structp png_ptr
,
1965 png_voidp user_chunk_ptr
, png_user_chunk_ptr read_user_chunk_fn
));
1966 extern PNG_EXPORT(png_voidp
,png_get_user_chunk_ptr
) PNGARG((png_structp
1970 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1971 /* Sets the function callbacks for the push reader, and a pointer to a
1972 * user-defined structure available to the callback functions.
1974 extern PNG_EXPORT(void,png_set_progressive_read_fn
) PNGARG((png_structp png_ptr
,
1975 png_voidp progressive_ptr
,
1976 png_progressive_info_ptr info_fn
, png_progressive_row_ptr row_fn
,
1977 png_progressive_end_ptr end_fn
));
1979 /* returns the user pointer associated with the push read functions */
1980 extern PNG_EXPORT(png_voidp
,png_get_progressive_ptr
)
1981 PNGARG((png_structp png_ptr
));
1983 /* function to be called when data becomes available */
1984 extern PNG_EXPORT(void,png_process_data
) PNGARG((png_structp png_ptr
,
1985 png_infop info_ptr
, png_bytep buffer
, png_size_t buffer_size
));
1987 /* function that combines rows. Not very much different than the
1988 * png_combine_row() call. Is this even used?????
1990 extern PNG_EXPORT(void,png_progressive_combine_row
) PNGARG((png_structp png_ptr
,
1991 png_bytep old_row
, png_bytep new_row
));
1992 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1994 extern PNG_EXPORT(png_voidp
,png_malloc
) PNGARG((png_structp png_ptr
,
1997 #if defined(PNG_1_0_X)
1998 # define png_malloc_warn png_malloc
2000 /* Added at libpng version 1.2.4 */
2001 extern PNG_EXPORT(png_voidp
,png_malloc_warn
) PNGARG((png_structp png_ptr
,
2005 /* frees a pointer allocated by png_malloc() */
2006 extern PNG_EXPORT(void,png_free
) PNGARG((png_structp png_ptr
, png_voidp ptr
));
2008 #if defined(PNG_1_0_X)
2009 /* Function to allocate memory for zlib. */
2010 extern PNG_EXPORT(voidpf
,png_zalloc
) PNGARG((voidpf png_ptr
, uInt items
,
2013 /* Function to free memory for zlib */
2014 extern PNG_EXPORT(void,png_zfree
) PNGARG((voidpf png_ptr
, voidpf ptr
));
2017 /* Free data that was allocated internally */
2018 extern PNG_EXPORT(void,png_free_data
) PNGARG((png_structp png_ptr
,
2019 png_infop info_ptr
, png_uint_32 free_me
, int num
));
2020 #ifdef PNG_FREE_ME_SUPPORTED
2021 /* Reassign responsibility for freeing existing data, whether allocated
2022 * by libpng or by the application */
2023 extern PNG_EXPORT(void,png_data_freer
) PNGARG((png_structp png_ptr
,
2024 png_infop info_ptr
, int freer
, png_uint_32 mask
));
2026 /* assignments for png_data_freer */
2027 #define PNG_DESTROY_WILL_FREE_DATA 1
2028 #define PNG_SET_WILL_FREE_DATA 1
2029 #define PNG_USER_WILL_FREE_DATA 2
2030 /* Flags for png_ptr->free_me and info_ptr->free_me */
2031 #define PNG_FREE_HIST 0x0008
2032 #define PNG_FREE_ICCP 0x0010
2033 #define PNG_FREE_SPLT 0x0020
2034 #define PNG_FREE_ROWS 0x0040
2035 #define PNG_FREE_PCAL 0x0080
2036 #define PNG_FREE_SCAL 0x0100
2037 #define PNG_FREE_UNKN 0x0200
2038 #define PNG_FREE_LIST 0x0400
2039 #define PNG_FREE_PLTE 0x1000
2040 #define PNG_FREE_TRNS 0x2000
2041 #define PNG_FREE_TEXT 0x4000
2042 #define PNG_FREE_ALL 0x7fff
2043 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2045 #ifdef PNG_USER_MEM_SUPPORTED
2046 extern PNG_EXPORT(png_voidp
,png_malloc_default
) PNGARG((png_structp png_ptr
,
2048 extern PNG_EXPORT(void,png_free_default
) PNGARG((png_structp png_ptr
,
2052 extern PNG_EXPORT(png_voidp
,png_memcpy_check
) PNGARG((png_structp png_ptr
,
2053 png_voidp s1
, png_voidp s2
, png_uint_32 size
));
2055 extern PNG_EXPORT(png_voidp
,png_memset_check
) PNGARG((png_structp png_ptr
,
2056 png_voidp s1
, int value
, png_uint_32 size
));
2058 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2059 extern void *png_far_to_near
PNGARG((png_structp png_ptr
,png_voidp ptr
,
2061 #endif /* USE_FAR_KEYWORD */
2063 #ifndef PNG_NO_ERROR_TEXT
2064 /* Fatal error in PNG image of libpng - can't continue */
2065 extern PNG_EXPORT(void,png_error
) PNGARG((png_structp png_ptr
,
2066 png_const_charp error_message
));
2068 /* The same, but the chunk name is prepended to the error string. */
2069 extern PNG_EXPORT(void,png_chunk_error
) PNGARG((png_structp png_ptr
,
2070 png_const_charp error_message
));
2072 /* Fatal error in PNG image of libpng - can't continue */
2073 extern PNG_EXPORT(void,png_err
) PNGARG((png_structp png_ptr
));
2076 #ifndef PNG_NO_WARNINGS
2077 /* Non-fatal error in libpng. Can continue, but may have a problem. */
2078 extern PNG_EXPORT(void,png_warning
) PNGARG((png_structp png_ptr
,
2079 png_const_charp warning_message
));
2081 #ifdef PNG_READ_SUPPORTED
2082 /* Non-fatal error in libpng, chunk name is prepended to message. */
2083 extern PNG_EXPORT(void,png_chunk_warning
) PNGARG((png_structp png_ptr
,
2084 png_const_charp warning_message
));
2085 #endif /* PNG_READ_SUPPORTED */
2086 #endif /* PNG_NO_WARNINGS */
2088 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
2089 * Similarly, the png_get_<chunk> calls are used to read values from the
2090 * png_info_struct, either storing the parameters in the passed variables, or
2091 * setting pointers into the png_info_struct where the data is stored. The
2092 * png_get_<chunk> functions return a non-zero value if the data was available
2093 * in info_ptr, or return zero and do not change any of the parameters if the
2094 * data was not available.
2096 * These functions should be used instead of directly accessing png_info
2097 * to avoid problems with future changes in the size and internal layout of
2100 /* Returns "flag" if chunk data is valid in info_ptr. */
2101 extern PNG_EXPORT(png_uint_32
,png_get_valid
) PNGARG((png_structp png_ptr
,
2102 png_infop info_ptr
, png_uint_32 flag
));
2104 /* Returns number of bytes needed to hold a transformed row. */
2105 extern PNG_EXPORT(png_uint_32
,png_get_rowbytes
) PNGARG((png_structp png_ptr
,
2106 png_infop info_ptr
));
2108 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2109 /* Returns row_pointers, which is an array of pointers to scanlines that was
2110 returned from png_read_png(). */
2111 extern PNG_EXPORT(png_bytepp
,png_get_rows
) PNGARG((png_structp png_ptr
,
2112 png_infop info_ptr
));
2113 /* Set row_pointers, which is an array of pointers to scanlines for use
2114 by png_write_png(). */
2115 extern PNG_EXPORT(void,png_set_rows
) PNGARG((png_structp png_ptr
,
2116 png_infop info_ptr
, png_bytepp row_pointers
));
2119 /* Returns number of color channels in image. */
2120 extern PNG_EXPORT(png_byte
,png_get_channels
) PNGARG((png_structp png_ptr
,
2121 png_infop info_ptr
));
2123 #ifdef PNG_EASY_ACCESS_SUPPORTED
2124 /* Returns image width in pixels. */
2125 extern PNG_EXPORT(png_uint_32
, png_get_image_width
) PNGARG((png_structp
2126 png_ptr
, png_infop info_ptr
));
2128 /* Returns image height in pixels. */
2129 extern PNG_EXPORT(png_uint_32
, png_get_image_height
) PNGARG((png_structp
2130 png_ptr
, png_infop info_ptr
));
2132 /* Returns image bit_depth. */
2133 extern PNG_EXPORT(png_byte
, png_get_bit_depth
) PNGARG((png_structp
2134 png_ptr
, png_infop info_ptr
));
2136 /* Returns image color_type. */
2137 extern PNG_EXPORT(png_byte
, png_get_color_type
) PNGARG((png_structp
2138 png_ptr
, png_infop info_ptr
));
2140 /* Returns image filter_type. */
2141 extern PNG_EXPORT(png_byte
, png_get_filter_type
) PNGARG((png_structp
2142 png_ptr
, png_infop info_ptr
));
2144 /* Returns image interlace_type. */
2145 extern PNG_EXPORT(png_byte
, png_get_interlace_type
) PNGARG((png_structp
2146 png_ptr
, png_infop info_ptr
));
2148 /* Returns image compression_type. */
2149 extern PNG_EXPORT(png_byte
, png_get_compression_type
) PNGARG((png_structp
2150 png_ptr
, png_infop info_ptr
));
2152 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
2153 extern PNG_EXPORT(png_uint_32
, png_get_pixels_per_meter
) PNGARG((png_structp
2154 png_ptr
, png_infop info_ptr
));
2155 extern PNG_EXPORT(png_uint_32
, png_get_x_pixels_per_meter
) PNGARG((png_structp
2156 png_ptr
, png_infop info_ptr
));
2157 extern PNG_EXPORT(png_uint_32
, png_get_y_pixels_per_meter
) PNGARG((png_structp
2158 png_ptr
, png_infop info_ptr
));
2160 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
2161 #ifdef PNG_FLOATING_POINT_SUPPORTED
2162 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio
) PNGARG((png_structp
2163 png_ptr
, png_infop info_ptr
));
2166 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2167 extern PNG_EXPORT(png_int_32
, png_get_x_offset_pixels
) PNGARG((png_structp
2168 png_ptr
, png_infop info_ptr
));
2169 extern PNG_EXPORT(png_int_32
, png_get_y_offset_pixels
) PNGARG((png_structp
2170 png_ptr
, png_infop info_ptr
));
2171 extern PNG_EXPORT(png_int_32
, png_get_x_offset_microns
) PNGARG((png_structp
2172 png_ptr
, png_infop info_ptr
));
2173 extern PNG_EXPORT(png_int_32
, png_get_y_offset_microns
) PNGARG((png_structp
2174 png_ptr
, png_infop info_ptr
));
2176 #endif /* PNG_EASY_ACCESS_SUPPORTED */
2178 /* Returns pointer to signature string read from PNG header */
2179 extern PNG_EXPORT(png_bytep
,png_get_signature
) PNGARG((png_structp png_ptr
,
2180 png_infop info_ptr
));
2182 #if defined(PNG_bKGD_SUPPORTED)
2183 extern PNG_EXPORT(png_uint_32
,png_get_bKGD
) PNGARG((png_structp png_ptr
,
2184 png_infop info_ptr
, png_color_16p
*background
));
2187 #if defined(PNG_bKGD_SUPPORTED)
2188 extern PNG_EXPORT(void,png_set_bKGD
) PNGARG((png_structp png_ptr
,
2189 png_infop info_ptr
, png_color_16p background
));
2192 #if defined(PNG_cHRM_SUPPORTED)
2193 #ifdef PNG_FLOATING_POINT_SUPPORTED
2194 extern PNG_EXPORT(png_uint_32
,png_get_cHRM
) PNGARG((png_structp png_ptr
,
2195 png_infop info_ptr
, double *white_x
, double *white_y
, double *red_x
,
2196 double *red_y
, double *green_x
, double *green_y
, double *blue_x
,
2199 #ifdef PNG_FIXED_POINT_SUPPORTED
2200 extern PNG_EXPORT(png_uint_32
,png_get_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2201 png_infop info_ptr
, png_fixed_point
*int_white_x
, png_fixed_point
2202 *int_white_y
, png_fixed_point
*int_red_x
, png_fixed_point
*int_red_y
,
2203 png_fixed_point
*int_green_x
, png_fixed_point
*int_green_y
, png_fixed_point
2204 *int_blue_x
, png_fixed_point
*int_blue_y
));
2208 #if defined(PNG_cHRM_SUPPORTED)
2209 #ifdef PNG_FLOATING_POINT_SUPPORTED
2210 extern PNG_EXPORT(void,png_set_cHRM
) PNGARG((png_structp png_ptr
,
2211 png_infop info_ptr
, double white_x
, double white_y
, double red_x
,
2212 double red_y
, double green_x
, double green_y
, double blue_x
, double blue_y
));
2214 #ifdef PNG_FIXED_POINT_SUPPORTED
2215 extern PNG_EXPORT(void,png_set_cHRM_fixed
) PNGARG((png_structp png_ptr
,
2216 png_infop info_ptr
, png_fixed_point int_white_x
, png_fixed_point int_white_y
,
2217 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
2218 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
2219 png_fixed_point int_blue_y
));
2223 #if defined(PNG_gAMA_SUPPORTED)
2224 #ifdef PNG_FLOATING_POINT_SUPPORTED
2225 extern PNG_EXPORT(png_uint_32
,png_get_gAMA
) PNGARG((png_structp png_ptr
,
2226 png_infop info_ptr
, double *file_gamma
));
2228 extern PNG_EXPORT(png_uint_32
,png_get_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2229 png_infop info_ptr
, png_fixed_point
*int_file_gamma
));
2232 #if defined(PNG_gAMA_SUPPORTED)
2233 #ifdef PNG_FLOATING_POINT_SUPPORTED
2234 extern PNG_EXPORT(void,png_set_gAMA
) PNGARG((png_structp png_ptr
,
2235 png_infop info_ptr
, double file_gamma
));
2237 extern PNG_EXPORT(void,png_set_gAMA_fixed
) PNGARG((png_structp png_ptr
,
2238 png_infop info_ptr
, png_fixed_point int_file_gamma
));
2241 #if defined(PNG_hIST_SUPPORTED)
2242 extern PNG_EXPORT(png_uint_32
,png_get_hIST
) PNGARG((png_structp png_ptr
,
2243 png_infop info_ptr
, png_uint_16p
*hist
));
2246 #if defined(PNG_hIST_SUPPORTED)
2247 extern PNG_EXPORT(void,png_set_hIST
) PNGARG((png_structp png_ptr
,
2248 png_infop info_ptr
, png_uint_16p hist
));
2251 extern PNG_EXPORT(png_uint_32
,png_get_IHDR
) PNGARG((png_structp png_ptr
,
2252 png_infop info_ptr
, png_uint_32
*width
, png_uint_32
*height
,
2253 int *bit_depth
, int *color_type
, int *interlace_method
,
2254 int *compression_method
, int *filter_method
));
2256 extern PNG_EXPORT(void,png_set_IHDR
) PNGARG((png_structp png_ptr
,
2257 png_infop info_ptr
, png_uint_32 width
, png_uint_32 height
, int bit_depth
,
2258 int color_type
, int interlace_method
, int compression_method
,
2259 int filter_method
));
2261 #if defined(PNG_oFFs_SUPPORTED)
2262 extern PNG_EXPORT(png_uint_32
,png_get_oFFs
) PNGARG((png_structp png_ptr
,
2263 png_infop info_ptr
, png_int_32
*offset_x
, png_int_32
*offset_y
,
2267 #if defined(PNG_oFFs_SUPPORTED)
2268 extern PNG_EXPORT(void,png_set_oFFs
) PNGARG((png_structp png_ptr
,
2269 png_infop info_ptr
, png_int_32 offset_x
, png_int_32 offset_y
,
2273 #if defined(PNG_pCAL_SUPPORTED)
2274 extern PNG_EXPORT(png_uint_32
,png_get_pCAL
) PNGARG((png_structp png_ptr
,
2275 png_infop info_ptr
, png_charp
*purpose
, png_int_32
*X0
, png_int_32
*X1
,
2276 int *type
, int *nparams
, png_charp
*units
, png_charpp
*params
));
2279 #if defined(PNG_pCAL_SUPPORTED)
2280 extern PNG_EXPORT(void,png_set_pCAL
) PNGARG((png_structp png_ptr
,
2281 png_infop info_ptr
, png_charp purpose
, png_int_32 X0
, png_int_32 X1
,
2282 int type
, int nparams
, png_charp units
, png_charpp params
));
2285 #if defined(PNG_pHYs_SUPPORTED)
2286 extern PNG_EXPORT(png_uint_32
,png_get_pHYs
) PNGARG((png_structp png_ptr
,
2287 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
2290 #if defined(PNG_pHYs_SUPPORTED)
2291 extern PNG_EXPORT(void,png_set_pHYs
) PNGARG((png_structp png_ptr
,
2292 png_infop info_ptr
, png_uint_32 res_x
, png_uint_32 res_y
, int unit_type
));
2295 extern PNG_EXPORT(png_uint_32
,png_get_PLTE
) PNGARG((png_structp png_ptr
,
2296 png_infop info_ptr
, png_colorp
*palette
, int *num_palette
));
2298 extern PNG_EXPORT(void,png_set_PLTE
) PNGARG((png_structp png_ptr
,
2299 png_infop info_ptr
, png_colorp palette
, int num_palette
));
2301 #if defined(PNG_sBIT_SUPPORTED)
2302 extern PNG_EXPORT(png_uint_32
,png_get_sBIT
) PNGARG((png_structp png_ptr
,
2303 png_infop info_ptr
, png_color_8p
*sig_bit
));
2306 #if defined(PNG_sBIT_SUPPORTED)
2307 extern PNG_EXPORT(void,png_set_sBIT
) PNGARG((png_structp png_ptr
,
2308 png_infop info_ptr
, png_color_8p sig_bit
));
2311 #if defined(PNG_sRGB_SUPPORTED)
2312 extern PNG_EXPORT(png_uint_32
,png_get_sRGB
) PNGARG((png_structp png_ptr
,
2313 png_infop info_ptr
, int *intent
));
2316 #if defined(PNG_sRGB_SUPPORTED)
2317 extern PNG_EXPORT(void,png_set_sRGB
) PNGARG((png_structp png_ptr
,
2318 png_infop info_ptr
, int intent
));
2319 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM
) PNGARG((png_structp png_ptr
,
2320 png_infop info_ptr
, int intent
));
2323 #if defined(PNG_iCCP_SUPPORTED)
2324 extern PNG_EXPORT(png_uint_32
,png_get_iCCP
) PNGARG((png_structp png_ptr
,
2325 png_infop info_ptr
, png_charpp name
, int *compression_type
,
2326 png_charpp profile
, png_uint_32
*proflen
));
2327 /* Note to maintainer: profile should be png_bytepp */
2330 #if defined(PNG_iCCP_SUPPORTED)
2331 extern PNG_EXPORT(void,png_set_iCCP
) PNGARG((png_structp png_ptr
,
2332 png_infop info_ptr
, png_charp name
, int compression_type
,
2333 png_charp profile
, png_uint_32 proflen
));
2334 /* Note to maintainer: profile should be png_bytep */
2337 #if defined(PNG_sPLT_SUPPORTED)
2338 extern PNG_EXPORT(png_uint_32
,png_get_sPLT
) PNGARG((png_structp png_ptr
,
2339 png_infop info_ptr
, png_sPLT_tpp entries
));
2342 #if defined(PNG_sPLT_SUPPORTED)
2343 extern PNG_EXPORT(void,png_set_sPLT
) PNGARG((png_structp png_ptr
,
2344 png_infop info_ptr
, png_sPLT_tp entries
, int nentries
));
2347 #if defined(PNG_TEXT_SUPPORTED)
2348 /* png_get_text also returns the number of text chunks in *num_text */
2349 extern PNG_EXPORT(png_uint_32
,png_get_text
) PNGARG((png_structp png_ptr
,
2350 png_infop info_ptr
, png_textp
*text_ptr
, int *num_text
));
2354 * Note while png_set_text() will accept a structure whose text,
2355 * language, and translated keywords are NULL pointers, the structure
2356 * returned by png_get_text will always contain regular
2357 * zero-terminated C strings. They might be empty strings but
2358 * they will never be NULL pointers.
2361 #if defined(PNG_TEXT_SUPPORTED)
2362 extern PNG_EXPORT(void,png_set_text
) PNGARG((png_structp png_ptr
,
2363 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
2366 #if defined(PNG_tIME_SUPPORTED)
2367 extern PNG_EXPORT(png_uint_32
,png_get_tIME
) PNGARG((png_structp png_ptr
,
2368 png_infop info_ptr
, png_timep
*mod_time
));
2371 #if defined(PNG_tIME_SUPPORTED)
2372 extern PNG_EXPORT(void,png_set_tIME
) PNGARG((png_structp png_ptr
,
2373 png_infop info_ptr
, png_timep mod_time
));
2376 #if defined(PNG_tRNS_SUPPORTED)
2377 extern PNG_EXPORT(png_uint_32
,png_get_tRNS
) PNGARG((png_structp png_ptr
,
2378 png_infop info_ptr
, png_bytep
*trans
, int *num_trans
,
2379 png_color_16p
*trans_values
));
2382 #if defined(PNG_tRNS_SUPPORTED)
2383 extern PNG_EXPORT(void,png_set_tRNS
) PNGARG((png_structp png_ptr
,
2384 png_infop info_ptr
, png_bytep trans
, int num_trans
,
2385 png_color_16p trans_values
));
2388 #if defined(PNG_tRNS_SUPPORTED)
2391 #if defined(PNG_sCAL_SUPPORTED)
2392 #ifdef PNG_FLOATING_POINT_SUPPORTED
2393 extern PNG_EXPORT(png_uint_32
,png_get_sCAL
) PNGARG((png_structp png_ptr
,
2394 png_infop info_ptr
, int *unit
, double *width
, double *height
));
2396 #ifdef PNG_FIXED_POINT_SUPPORTED
2397 extern PNG_EXPORT(png_uint_32
,png_get_sCAL_s
) PNGARG((png_structp png_ptr
,
2398 png_infop info_ptr
, int *unit
, png_charpp swidth
, png_charpp sheight
));
2401 #endif /* PNG_sCAL_SUPPORTED */
2403 #if defined(PNG_sCAL_SUPPORTED)
2404 #ifdef PNG_FLOATING_POINT_SUPPORTED
2405 extern PNG_EXPORT(void,png_set_sCAL
) PNGARG((png_structp png_ptr
,
2406 png_infop info_ptr
, int unit
, double width
, double height
));
2408 #ifdef PNG_FIXED_POINT_SUPPORTED
2409 extern PNG_EXPORT(void,png_set_sCAL_s
) PNGARG((png_structp png_ptr
,
2410 png_infop info_ptr
, int unit
, png_charp swidth
, png_charp sheight
));
2413 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2415 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2416 /* provide a list of chunks and how they are to be handled, if the built-in
2417 handling or default unknown chunk handling is not desired. Any chunks not
2418 listed will be handled in the default manner. The IHDR and IEND chunks
2420 keep = 0: follow default behaviour
2422 = 2: keep only if safe-to-copy
2423 = 3: keep even if unsafe-to-copy
2425 extern PNG_EXPORT(void, png_set_keep_unknown_chunks
) PNGARG((png_structp
2426 png_ptr
, int keep
, png_bytep chunk_list
, int num_chunks
));
2427 extern PNG_EXPORT(void, png_set_unknown_chunks
) PNGARG((png_structp png_ptr
,
2428 png_infop info_ptr
, png_unknown_chunkp unknowns
, int num_unknowns
));
2429 extern PNG_EXPORT(void, png_set_unknown_chunk_location
)
2430 PNGARG((png_structp png_ptr
, png_infop info_ptr
, int chunk
, int location
));
2431 extern PNG_EXPORT(png_uint_32
,png_get_unknown_chunks
) PNGARG((png_structp
2432 png_ptr
, png_infop info_ptr
, png_unknown_chunkpp entries
));
2434 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2435 PNG_EXPORT(int,png_handle_as_unknown
) PNGARG((png_structp png_ptr
, png_bytep
2439 /* Png_free_data() will turn off the "valid" flag for anything it frees.
2440 If you need to turn it off for a chunk that your application has freed,
2441 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2442 extern PNG_EXPORT(void, png_set_invalid
) PNGARG((png_structp png_ptr
,
2443 png_infop info_ptr
, int mask
));
2445 #if defined(PNG_INFO_IMAGE_SUPPORTED)
2446 /* The "params" pointer is currently not used and is for future expansion. */
2447 extern PNG_EXPORT(void, png_read_png
) PNGARG((png_structp png_ptr
,
2451 extern PNG_EXPORT(void, png_write_png
) PNGARG((png_structp png_ptr
,
2457 /* Define PNG_DEBUG at compile time for debugging information. Higher
2458 * numbers for PNG_DEBUG mean more debugging information. This has
2459 * only been added since version 0.95 so it is not implemented throughout
2460 * libpng yet, but more support will be added as needed.
2464 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2467 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
2468 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2469 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2471 #else /* PNG_DEBUG_FILE || !_MSC_VER */
2472 #ifndef PNG_DEBUG_FILE
2473 #define PNG_DEBUG_FILE stderr
2474 #endif /* PNG_DEBUG_FILE */
2476 #define png_debug(l,m) \
2479 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2480 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2482 #define png_debug1(l,m,p1) \
2485 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2486 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2488 #define png_debug2(l,m,p1,p2) \
2491 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2492 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2494 #endif /* (PNG_DEBUG > 1) */
2495 #endif /* _MSC_VER */
2496 #endif /* (PNG_DEBUG > 0) */
2497 #endif /* PNG_DEBUG */
2499 #define png_debug(l, m)
2502 #define png_debug1(l, m, p1)
2505 #define png_debug2(l, m, p1, p2)
2508 extern PNG_EXPORT(png_charp
,png_get_copyright
) PNGARG((png_structp png_ptr
));
2509 extern PNG_EXPORT(png_charp
,png_get_header_ver
) PNGARG((png_structp png_ptr
));
2510 extern PNG_EXPORT(png_charp
,png_get_header_version
) PNGARG((png_structp png_ptr
));
2511 extern PNG_EXPORT(png_charp
,png_get_libpng_ver
) PNGARG((png_structp png_ptr
));
2513 #ifdef PNG_MNG_FEATURES_SUPPORTED
2514 extern PNG_EXPORT(png_uint_32
,png_permit_mng_features
) PNGARG((png_structp
2515 png_ptr
, png_uint_32 mng_features_permitted
));
2518 /* For use in png_set_keep_unknown, added to version 1.2.6 */
2519 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2520 #define PNG_HANDLE_CHUNK_NEVER 1
2521 #define PNG_HANDLE_CHUNK_IF_SAFE 2
2522 #define PNG_HANDLE_CHUNK_ALWAYS 3
2524 /* Added to version 1.2.0 */
2525 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2526 #if defined(PNG_MMX_CODE_SUPPORTED)
2527 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2528 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2529 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2530 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2531 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2532 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2533 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2534 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2535 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2537 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2538 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2539 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2540 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2541 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2542 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2543 #define PNG_MMX_WRITE_FLAGS ( 0 )
2545 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2546 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2547 | PNG_MMX_READ_FLAGS \
2548 | PNG_MMX_WRITE_FLAGS )
2550 #define PNG_SELECT_READ 1
2551 #define PNG_SELECT_WRITE 2
2552 #endif /* PNG_MMX_CODE_SUPPORTED */
2554 #if !defined(PNG_1_0_X)
2556 extern PNG_EXPORT(png_uint_32
,png_get_mmx_flagmask
)
2557 PNGARG((int flag_select
, int *compilerID
));
2560 extern PNG_EXPORT(png_uint_32
,png_get_asm_flagmask
)
2561 PNGARG((int flag_select
));
2564 extern PNG_EXPORT(png_uint_32
,png_get_asm_flags
)
2565 PNGARG((png_structp png_ptr
));
2568 extern PNG_EXPORT(png_byte
,png_get_mmx_bitdepth_threshold
)
2569 PNGARG((png_structp png_ptr
));
2572 extern PNG_EXPORT(png_uint_32
,png_get_mmx_rowbytes_threshold
)
2573 PNGARG((png_structp png_ptr
));
2576 extern PNG_EXPORT(void,png_set_asm_flags
)
2577 PNGARG((png_structp png_ptr
, png_uint_32 asm_flags
));
2580 extern PNG_EXPORT(void,png_set_mmx_thresholds
)
2581 PNGARG((png_structp png_ptr
, png_byte mmx_bitdepth_threshold
,
2582 png_uint_32 mmx_rowbytes_threshold
));
2584 #endif /* PNG_1_0_X */
2586 #if !defined(PNG_1_0_X)
2587 /* png.c, pnggccrd.c, or pngvcrd.c */
2588 extern PNG_EXPORT(int,png_mmx_support
) PNGARG((void));
2589 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2591 /* Strip the prepended error numbers ("#nnn ") from error and warning
2592 * messages before passing them to the error or warning handler. */
2593 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
2594 extern PNG_EXPORT(void,png_set_strip_error_numbers
) PNGARG((png_structp
2595 png_ptr
, png_uint_32 strip_mode
));
2598 #endif /* PNG_1_0_X */
2600 /* Added at libpng-1.2.6 */
2601 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
2602 extern PNG_EXPORT(void,png_set_user_limits
) PNGARG((png_structp
2603 png_ptr
, png_uint_32 user_width_max
, png_uint_32 user_height_max
));
2604 extern PNG_EXPORT(png_uint_32
,png_get_user_width_max
) PNGARG((png_structp
2606 extern PNG_EXPORT(png_uint_32
,png_get_user_height_max
) PNGARG((png_structp
2610 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2612 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2613 /* With these routines we avoid an integer divide, which will be slower on
2614 * most machines. However, it does take more operations than the corresponding
2615 * divide method, so it may be slower on a few RISC systems. There are two
2616 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2618 * Note that the rounding factors are NOT supposed to be the same! 128 and
2619 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2622 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2625 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2627 # define png_composite(composite, fg, alpha, bg) \
2628 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2629 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2630 (png_uint_16)(alpha)) + (png_uint_16)128); \
2631 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2633 # define png_composite_16(composite, fg, alpha, bg) \
2634 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2635 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2636 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2637 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2639 #else /* standard method using integer division */
2641 # define png_composite(composite, fg, alpha, bg) \
2642 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2643 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2644 (png_uint_16)127) / 255)
2646 # define png_composite_16(composite, fg, alpha, bg) \
2647 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2648 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2649 (png_uint_32)32767) / (png_uint_32)65535L)
2651 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2653 /* Inline macros to do direct reads of bytes from the input buffer. These
2654 * require that you are using an architecture that uses PNG byte ordering
2655 * (MSB first) and supports unaligned data storage. I think that PowerPC
2656 * in big-endian mode and 680x0 are the only ones that will support this.
2657 * The x86 line of processors definitely do not. The png_get_int_32()
2658 * routine also assumes we are using two's complement format for negative
2659 * values, which is almost certainly true.
2661 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2662 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2663 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2664 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2666 extern PNG_EXPORT(png_uint_32
,png_get_uint_32
) PNGARG((png_bytep buf
));
2667 extern PNG_EXPORT(png_uint_16
,png_get_uint_16
) PNGARG((png_bytep buf
));
2668 extern PNG_EXPORT(png_int_32
,png_get_int_32
) PNGARG((png_bytep buf
));
2669 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2670 extern PNG_EXPORT(png_uint_32
,png_get_uint_31
)
2671 PNGARG((png_structp png_ptr
, png_bytep buf
));
2672 /* No png_get_int_16 -- may be added if there's a real need for it. */
2674 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2676 extern PNG_EXPORT(void,png_save_uint_32
)
2677 PNGARG((png_bytep buf
, png_uint_32 i
));
2678 extern PNG_EXPORT(void,png_save_int_32
)
2679 PNGARG((png_bytep buf
, png_int_32 i
));
2681 /* Place a 16-bit number into a buffer in PNG byte order.
2682 * The parameter is declared unsigned int, not png_uint_16,
2683 * just to avoid potential problems on pre-ANSI C compilers.
2685 extern PNG_EXPORT(void,png_save_uint_16
)
2686 PNGARG((png_bytep buf
, unsigned int i
));
2687 /* No png_save_int_16 -- may be added if there's a real need for it. */
2689 /* ************************************************************************* */
2691 /* These next functions are used internally in the code. They generally
2692 * shouldn't be used unless you are writing code to add or replace some
2693 * functionality in libpng. More information about most functions can
2694 * be found in the files where the functions are located.
2698 /* Various modes of operation, that are visible to applications because
2699 * they are used for unknown chunk location.
2701 #define PNG_HAVE_IHDR 0x01
2702 #define PNG_HAVE_PLTE 0x02
2703 #define PNG_HAVE_IDAT 0x04
2704 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2705 #define PNG_HAVE_IEND 0x10
2707 #if defined(PNG_INTERNAL)
2709 /* More modes of operation. Note that after an init, mode is set to
2710 * zero automatically when the structure is created.
2712 #define PNG_HAVE_gAMA 0x20
2713 #define PNG_HAVE_cHRM 0x40
2714 #define PNG_HAVE_sRGB 0x80
2715 #define PNG_HAVE_CHUNK_HEADER 0x100
2716 #define PNG_WROTE_tIME 0x200
2717 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2718 #define PNG_BACKGROUND_IS_GRAY 0x800
2719 #define PNG_HAVE_PNG_SIGNATURE 0x1000
2720 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2722 /* flags for the transformations the PNG library does on the image data */
2723 #define PNG_BGR 0x0001
2724 #define PNG_INTERLACE 0x0002
2725 #define PNG_PACK 0x0004
2726 #define PNG_SHIFT 0x0008
2727 #define PNG_SWAP_BYTES 0x0010
2728 #define PNG_INVERT_MONO 0x0020
2729 #define PNG_DITHER 0x0040
2730 #define PNG_BACKGROUND 0x0080
2731 #define PNG_BACKGROUND_EXPAND 0x0100
2733 #define PNG_16_TO_8 0x0400
2734 #define PNG_RGBA 0x0800
2735 #define PNG_EXPAND 0x1000
2736 #define PNG_GAMMA 0x2000
2737 #define PNG_GRAY_TO_RGB 0x4000
2738 #define PNG_FILLER 0x8000L
2739 #define PNG_PACKSWAP 0x10000L
2740 #define PNG_SWAP_ALPHA 0x20000L
2741 #define PNG_STRIP_ALPHA 0x40000L
2742 #define PNG_INVERT_ALPHA 0x80000L
2743 #define PNG_USER_TRANSFORM 0x100000L
2744 #define PNG_RGB_TO_GRAY_ERR 0x200000L
2745 #define PNG_RGB_TO_GRAY_WARN 0x400000L
2746 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2747 /* 0x800000L Unused */
2748 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2749 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2750 /* 0x4000000L unused */
2751 /* 0x8000000L unused */
2752 /* 0x10000000L unused */
2753 /* 0x20000000L unused */
2754 /* 0x40000000L unused */
2756 /* flags for png_create_struct */
2757 #define PNG_STRUCT_PNG 0x0001
2758 #define PNG_STRUCT_INFO 0x0002
2760 /* Scaling factor for filter heuristic weighting calculations */
2761 #define PNG_WEIGHT_SHIFT 8
2762 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2763 #define PNG_COST_SHIFT 3
2764 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2766 /* flags for the png_ptr->flags rather than declaring a byte for each one */
2767 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2768 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2769 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2770 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2771 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2772 #define PNG_FLAG_ZLIB_FINISHED 0x0020
2773 #define PNG_FLAG_ROW_INIT 0x0040
2774 #define PNG_FLAG_FILLER_AFTER 0x0080
2775 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2776 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2777 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2778 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2779 #define PNG_FLAG_FREE_PLTE 0x1000
2780 #define PNG_FLAG_FREE_TRNS 0x2000
2781 #define PNG_FLAG_FREE_HIST 0x4000
2782 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2783 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2784 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2785 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2786 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2787 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2788 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2789 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2790 /* 0x800000L unused */
2791 /* 0x1000000L unused */
2792 /* 0x2000000L unused */
2793 /* 0x4000000L unused */
2794 /* 0x8000000L unused */
2795 /* 0x10000000L unused */
2796 /* 0x20000000L unused */
2797 /* 0x40000000L unused */
2799 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2800 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2802 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2803 PNG_FLAG_CRC_CRITICAL_IGNORE)
2805 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2806 PNG_FLAG_CRC_CRITICAL_MASK)
2808 /* save typing and make code easier to understand */
2810 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2811 abs((int)((c1).green) - (int)((c2).green)) + \
2812 abs((int)((c1).blue) - (int)((c2).blue)))
2814 /* Added to libpng-1.2.6 JB */
2815 #define PNG_ROWBYTES(pixel_bits, width) \
2816 ((pixel_bits) >= 8 ? \
2817 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2818 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2820 /* PNG_OUT_OF_RANGE returns true if value is outside the range
2821 ideal-delta..ideal+delta. Each argument is evaluated twice.
2822 "ideal" and "delta" should be constants, normally simple
2823 integers, "value" a variable. Added to libpng-1.2.6 JB */
2824 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
2825 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2827 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2828 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2829 /* place to hold the signature string for a PNG file. */
2830 #ifdef PNG_USE_GLOBAL_ARRAYS
2831 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA
) png_sig
[8];
2834 #endif /* PNG_NO_EXTERN */
2836 /* Constant strings for known chunk types. If you need to add a chunk,
2837 * define the name here, and add an invocation of the macro in png.c and
2838 * wherever it's needed.
2840 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2841 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2842 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2843 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2844 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2845 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2846 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2847 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2848 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2849 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2850 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2851 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2852 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2853 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2854 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2855 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2856 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2857 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2858 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2859 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2860 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2862 #ifdef PNG_USE_GLOBAL_ARRAYS
2863 PNG_EXPORT_VAR (png_byte FARDATA
) png_IHDR
[5];
2864 PNG_EXPORT_VAR (png_byte FARDATA
) png_IDAT
[5];
2865 PNG_EXPORT_VAR (png_byte FARDATA
) png_IEND
[5];
2866 PNG_EXPORT_VAR (png_byte FARDATA
) png_PLTE
[5];
2867 PNG_EXPORT_VAR (png_byte FARDATA
) png_bKGD
[5];
2868 PNG_EXPORT_VAR (png_byte FARDATA
) png_cHRM
[5];
2869 PNG_EXPORT_VAR (png_byte FARDATA
) png_gAMA
[5];
2870 PNG_EXPORT_VAR (png_byte FARDATA
) png_hIST
[5];
2871 PNG_EXPORT_VAR (png_byte FARDATA
) png_iCCP
[5];
2872 PNG_EXPORT_VAR (png_byte FARDATA
) png_iTXt
[5];
2873 PNG_EXPORT_VAR (png_byte FARDATA
) png_oFFs
[5];
2874 PNG_EXPORT_VAR (png_byte FARDATA
) png_pCAL
[5];
2875 PNG_EXPORT_VAR (png_byte FARDATA
) png_sCAL
[5];
2876 PNG_EXPORT_VAR (png_byte FARDATA
) png_pHYs
[5];
2877 PNG_EXPORT_VAR (png_byte FARDATA
) png_sBIT
[5];
2878 PNG_EXPORT_VAR (png_byte FARDATA
) png_sPLT
[5];
2879 PNG_EXPORT_VAR (png_byte FARDATA
) png_sRGB
[5];
2880 PNG_EXPORT_VAR (png_byte FARDATA
) png_tEXt
[5];
2881 PNG_EXPORT_VAR (png_byte FARDATA
) png_tIME
[5];
2882 PNG_EXPORT_VAR (png_byte FARDATA
) png_tRNS
[5];
2883 PNG_EXPORT_VAR (png_byte FARDATA
) png_zTXt
[5];
2884 #endif /* PNG_USE_GLOBAL_ARRAYS */
2886 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2887 /* Initialize png_ptr struct for reading, and allocate any other memory.
2888 * (old interface - DEPRECATED - use png_create_read_struct instead).
2890 extern PNG_EXPORT(void,png_read_init
) PNGARG((png_structp png_ptr
));
2891 #undef png_read_init
2892 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2893 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2896 extern PNG_EXPORT(void,png_read_init_3
) PNGARG((png_structpp ptr_ptr
,
2897 png_const_charp user_png_ver
, png_size_t png_struct_size
));
2898 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2899 extern PNG_EXPORT(void,png_read_init_2
) PNGARG((png_structp png_ptr
,
2900 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
2904 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2905 /* Initialize png_ptr struct for writing, and allocate any other memory.
2906 * (old interface - DEPRECATED - use png_create_write_struct instead).
2908 extern PNG_EXPORT(void,png_write_init
) PNGARG((png_structp png_ptr
));
2909 #undef png_write_init
2910 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2911 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2914 extern PNG_EXPORT(void,png_write_init_3
) PNGARG((png_structpp ptr_ptr
,
2915 png_const_charp user_png_ver
, png_size_t png_struct_size
));
2916 extern PNG_EXPORT(void,png_write_init_2
) PNGARG((png_structp png_ptr
,
2917 png_const_charp user_png_ver
, png_size_t png_struct_size
, png_size_t
2920 /* Allocate memory for an internal libpng struct */
2921 PNG_EXTERN png_voidp png_create_struct
PNGARG((int type
));
2923 /* Free memory from internal libpng struct */
2924 PNG_EXTERN
void png_destroy_struct
PNGARG((png_voidp struct_ptr
));
2926 PNG_EXTERN png_voidp png_create_struct_2
PNGARG((int type
, png_malloc_ptr
2927 malloc_fn
, png_voidp mem_ptr
));
2928 PNG_EXTERN
void png_destroy_struct_2
PNGARG((png_voidp struct_ptr
,
2929 png_free_ptr free_fn
, png_voidp mem_ptr
));
2931 /* Free any memory that info_ptr points to and reset struct. */
2932 PNG_EXTERN
void png_info_destroy
PNGARG((png_structp png_ptr
,
2933 png_infop info_ptr
));
2936 /* Function to allocate memory for zlib. */
2937 PNG_EXTERN voidpf png_zalloc
PNGARG((voidpf png_ptr
, uInt items
, uInt size
));
2939 /* Function to free memory for zlib */
2940 PNG_EXTERN
void png_zfree
PNGARG((voidpf png_ptr
, voidpf ptr
));
2943 /* Function to convert a sizeof an item to png_sizeof item */
2944 PNG_EXTERN png_size_t PNGAPI png_convert_size
PNGARG((size_t size
));
2947 /* Next four functions are used internally as callbacks. PNGAPI is required
2948 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2950 PNG_EXTERN
void PNGAPI png_default_read_data
PNGARG((png_structp png_ptr
,
2951 png_bytep data
, png_size_t length
));
2953 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2954 PNG_EXTERN
void PNGAPI png_push_fill_buffer
PNGARG((png_structp png_ptr
,
2955 png_bytep buffer
, png_size_t length
));
2958 PNG_EXTERN
void PNGAPI png_default_write_data
PNGARG((png_structp png_ptr
,
2959 png_bytep data
, png_size_t length
));
2961 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
2962 #if !defined(PNG_NO_STDIO)
2963 PNG_EXTERN
void PNGAPI png_default_flush
PNGARG((png_structp png_ptr
));
2966 #else /* PNG_1_0_X */
2967 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2968 PNG_EXTERN
void png_push_fill_buffer
PNGARG((png_structp png_ptr
,
2969 png_bytep buffer
, png_size_t length
));
2971 #endif /* PNG_1_0_X */
2973 /* Reset the CRC variable */
2974 PNG_EXTERN
void png_reset_crc
PNGARG((png_structp png_ptr
));
2976 /* Write the "data" buffer to whatever output you are using. */
2977 PNG_EXTERN
void png_write_data
PNGARG((png_structp png_ptr
, png_bytep data
,
2978 png_size_t length
));
2980 /* Read data from whatever input you are using into the "data" buffer */
2981 PNG_EXTERN
void png_read_data
PNGARG((png_structp png_ptr
, png_bytep data
,
2982 png_size_t length
));
2984 /* Read bytes into buf, and update png_ptr->crc */
2985 PNG_EXTERN
void png_crc_read
PNGARG((png_structp png_ptr
, png_bytep buf
,
2986 png_size_t length
));
2988 /* Decompress data in a chunk that uses compression */
2989 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
2990 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
2991 PNG_EXTERN png_charp png_decompress_chunk
PNGARG((png_structp png_ptr
,
2992 int comp_type
, png_charp chunkdata
, png_size_t chunklength
,
2993 png_size_t prefix_length
, png_size_t
*data_length
));
2996 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
2997 PNG_EXTERN
int png_crc_finish
PNGARG((png_structp png_ptr
, png_uint_32 skip
));
2999 /* Read the CRC from the file and compare it to the libpng calculated CRC */
3000 PNG_EXTERN
int png_crc_error
PNGARG((png_structp png_ptr
));
3002 /* Calculate the CRC over a section of data. Note that we are only
3003 * passing a maximum of 64K on systems that have this as a memory limit,
3004 * since this is the maximum buffer size we can specify.
3006 PNG_EXTERN
void png_calculate_crc
PNGARG((png_structp png_ptr
, png_bytep ptr
,
3007 png_size_t length
));
3009 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
3010 PNG_EXTERN
void png_flush
PNGARG((png_structp png_ptr
));
3013 /* simple function to write the signature */
3014 PNG_EXTERN
void png_write_sig
PNGARG((png_structp png_ptr
));
3016 /* write various chunks */
3018 /* Write the IHDR chunk, and update the png_struct with the necessary
3021 PNG_EXTERN
void png_write_IHDR
PNGARG((png_structp png_ptr
, png_uint_32 width
,
3023 int bit_depth
, int color_type
, int compression_method
, int filter_method
,
3024 int interlace_method
));
3026 PNG_EXTERN
void png_write_PLTE
PNGARG((png_structp png_ptr
, png_colorp palette
,
3027 png_uint_32 num_pal
));
3029 PNG_EXTERN
void png_write_IDAT
PNGARG((png_structp png_ptr
, png_bytep data
,
3030 png_size_t length
));
3032 PNG_EXTERN
void png_write_IEND
PNGARG((png_structp png_ptr
));
3034 #if defined(PNG_WRITE_gAMA_SUPPORTED)
3035 #ifdef PNG_FLOATING_POINT_SUPPORTED
3036 PNG_EXTERN
void png_write_gAMA
PNGARG((png_structp png_ptr
, double file_gamma
));
3038 #ifdef PNG_FIXED_POINT_SUPPORTED
3039 PNG_EXTERN
void png_write_gAMA_fixed
PNGARG((png_structp png_ptr
, png_fixed_point
3044 #if defined(PNG_WRITE_sBIT_SUPPORTED)
3045 PNG_EXTERN
void png_write_sBIT
PNGARG((png_structp png_ptr
, png_color_8p sbit
,
3049 #if defined(PNG_WRITE_cHRM_SUPPORTED)
3050 #ifdef PNG_FLOATING_POINT_SUPPORTED
3051 PNG_EXTERN
void png_write_cHRM
PNGARG((png_structp png_ptr
,
3052 double white_x
, double white_y
,
3053 double red_x
, double red_y
, double green_x
, double green_y
,
3054 double blue_x
, double blue_y
));
3056 #ifdef PNG_FIXED_POINT_SUPPORTED
3057 PNG_EXTERN
void png_write_cHRM_fixed
PNGARG((png_structp png_ptr
,
3058 png_fixed_point int_white_x
, png_fixed_point int_white_y
,
3059 png_fixed_point int_red_x
, png_fixed_point int_red_y
, png_fixed_point
3060 int_green_x
, png_fixed_point int_green_y
, png_fixed_point int_blue_x
,
3061 png_fixed_point int_blue_y
));
3065 #if defined(PNG_WRITE_sRGB_SUPPORTED)
3066 PNG_EXTERN
void png_write_sRGB
PNGARG((png_structp png_ptr
,
3070 #if defined(PNG_WRITE_iCCP_SUPPORTED)
3071 PNG_EXTERN
void png_write_iCCP
PNGARG((png_structp png_ptr
,
3072 png_charp name
, int compression_type
,
3073 png_charp profile
, int proflen
));
3074 /* Note to maintainer: profile should be png_bytep */
3077 #if defined(PNG_WRITE_sPLT_SUPPORTED)
3078 PNG_EXTERN
void png_write_sPLT
PNGARG((png_structp png_ptr
,
3079 png_sPLT_tp palette
));
3082 #if defined(PNG_WRITE_tRNS_SUPPORTED)
3083 PNG_EXTERN
void png_write_tRNS
PNGARG((png_structp png_ptr
, png_bytep trans
,
3084 png_color_16p values
, int number
, int color_type
));
3087 #if defined(PNG_WRITE_bKGD_SUPPORTED)
3088 PNG_EXTERN
void png_write_bKGD
PNGARG((png_structp png_ptr
,
3089 png_color_16p values
, int color_type
));
3092 #if defined(PNG_WRITE_hIST_SUPPORTED)
3093 PNG_EXTERN
void png_write_hIST
PNGARG((png_structp png_ptr
, png_uint_16p hist
,
3097 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3098 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3099 PNG_EXTERN png_size_t png_check_keyword
PNGARG((png_structp png_ptr
,
3100 png_charp key
, png_charpp new_key
));
3103 #if defined(PNG_WRITE_tEXt_SUPPORTED)
3104 PNG_EXTERN
void png_write_tEXt
PNGARG((png_structp png_ptr
, png_charp key
,
3105 png_charp text
, png_size_t text_len
));
3108 #if defined(PNG_WRITE_zTXt_SUPPORTED)
3109 PNG_EXTERN
void png_write_zTXt
PNGARG((png_structp png_ptr
, png_charp key
,
3110 png_charp text
, png_size_t text_len
, int compression
));
3113 #if defined(PNG_WRITE_iTXt_SUPPORTED)
3114 PNG_EXTERN
void png_write_iTXt
PNGARG((png_structp png_ptr
,
3115 int compression
, png_charp key
, png_charp lang
, png_charp lang_key
,
3119 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3120 PNG_EXTERN
int png_set_text_2
PNGARG((png_structp png_ptr
,
3121 png_infop info_ptr
, png_textp text_ptr
, int num_text
));
3124 #if defined(PNG_WRITE_oFFs_SUPPORTED)
3125 PNG_EXTERN
void png_write_oFFs
PNGARG((png_structp png_ptr
,
3126 png_int_32 x_offset
, png_int_32 y_offset
, int unit_type
));
3129 #if defined(PNG_WRITE_pCAL_SUPPORTED)
3130 PNG_EXTERN
void png_write_pCAL
PNGARG((png_structp png_ptr
, png_charp purpose
,
3131 png_int_32 X0
, png_int_32 X1
, int type
, int nparams
,
3132 png_charp units
, png_charpp params
));
3135 #if defined(PNG_WRITE_pHYs_SUPPORTED)
3136 PNG_EXTERN
void png_write_pHYs
PNGARG((png_structp png_ptr
,
3137 png_uint_32 x_pixels_per_unit
, png_uint_32 y_pixels_per_unit
,
3141 #if defined(PNG_WRITE_tIME_SUPPORTED)
3142 PNG_EXTERN
void png_write_tIME
PNGARG((png_structp png_ptr
,
3143 png_timep mod_time
));
3146 #if defined(PNG_WRITE_sCAL_SUPPORTED)
3147 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3148 PNG_EXTERN
void png_write_sCAL
PNGARG((png_structp png_ptr
,
3149 int unit
, double width
, double height
));
3151 #ifdef PNG_FIXED_POINT_SUPPORTED
3152 PNG_EXTERN
void png_write_sCAL_s
PNGARG((png_structp png_ptr
,
3153 int unit
, png_charp width
, png_charp height
));
3158 /* Called when finished processing a row of data */
3159 PNG_EXTERN
void png_write_finish_row
PNGARG((png_structp png_ptr
));
3161 /* Internal use only. Called before first row of data */
3162 PNG_EXTERN
void png_write_start_row
PNGARG((png_structp png_ptr
));
3164 #if defined(PNG_READ_GAMMA_SUPPORTED)
3165 PNG_EXTERN
void png_build_gamma_table
PNGARG((png_structp png_ptr
));
3168 /* combine a row of data, dealing with alpha, etc. if requested */
3169 PNG_EXTERN
void png_combine_row
PNGARG((png_structp png_ptr
, png_bytep row
,
3172 #if defined(PNG_READ_INTERLACING_SUPPORTED)
3173 /* expand an interlaced row */
3174 /* OLD pre-1.0.9 interface:
3175 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3176 png_bytep row, int pass, png_uint_32 transformations));
3178 PNG_EXTERN
void png_do_read_interlace
PNGARG((png_structp png_ptr
));
3181 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3183 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3184 /* grab pixels out of a row for an interlaced pass */
3185 PNG_EXTERN
void png_do_write_interlace
PNGARG((png_row_infop row_info
,
3186 png_bytep row
, int pass
));
3189 /* unfilter a row */
3190 PNG_EXTERN
void png_read_filter_row
PNGARG((png_structp png_ptr
,
3191 png_row_infop row_info
, png_bytep row
, png_bytep prev_row
, int filter
));
3193 /* Choose the best filter to use and filter the row data */
3194 PNG_EXTERN
void png_write_find_filter
PNGARG((png_structp png_ptr
,
3195 png_row_infop row_info
));
3197 /* Write out the filtered row. */
3198 PNG_EXTERN
void png_write_filtered_row
PNGARG((png_structp png_ptr
,
3199 png_bytep filtered_row
));
3200 /* finish a row while reading, dealing with interlacing passes, etc. */
3201 PNG_EXTERN
void png_read_finish_row
PNGARG((png_structp png_ptr
));
3203 /* initialize the row buffers, etc. */
3204 PNG_EXTERN
void png_read_start_row
PNGARG((png_structp png_ptr
));
3205 /* optional call to update the users info structure */
3206 PNG_EXTERN
void png_read_transform_info
PNGARG((png_structp png_ptr
,
3207 png_infop info_ptr
));
3209 /* these are the functions that do the transformations */
3210 #if defined(PNG_READ_FILLER_SUPPORTED)
3211 PNG_EXTERN
void png_do_read_filler
PNGARG((png_row_infop row_info
,
3212 png_bytep row
, png_uint_32 filler
, png_uint_32 flags
));
3215 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3216 PNG_EXTERN
void png_do_read_swap_alpha
PNGARG((png_row_infop row_info
,
3220 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3221 PNG_EXTERN
void png_do_write_swap_alpha
PNGARG((png_row_infop row_info
,
3225 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3226 PNG_EXTERN
void png_do_read_invert_alpha
PNGARG((png_row_infop row_info
,
3230 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3231 PNG_EXTERN
void png_do_write_invert_alpha
PNGARG((png_row_infop row_info
,
3235 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3236 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3237 PNG_EXTERN
void png_do_strip_filler
PNGARG((png_row_infop row_info
,
3238 png_bytep row
, png_uint_32 flags
));
3241 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3242 PNG_EXTERN
void png_do_swap
PNGARG((png_row_infop row_info
, png_bytep row
));
3245 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3246 PNG_EXTERN
void png_do_packswap
PNGARG((png_row_infop row_info
, png_bytep row
));
3249 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3250 PNG_EXTERN
int png_do_rgb_to_gray
PNGARG((png_structp png_ptr
, png_row_infop
3251 row_info
, png_bytep row
));
3254 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3255 PNG_EXTERN
void png_do_gray_to_rgb
PNGARG((png_row_infop row_info
,
3259 #if defined(PNG_READ_PACK_SUPPORTED)
3260 PNG_EXTERN
void png_do_unpack
PNGARG((png_row_infop row_info
, png_bytep row
));
3263 #if defined(PNG_READ_SHIFT_SUPPORTED)
3264 PNG_EXTERN
void png_do_unshift
PNGARG((png_row_infop row_info
, png_bytep row
,
3265 png_color_8p sig_bits
));
3268 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3269 PNG_EXTERN
void png_do_invert
PNGARG((png_row_infop row_info
, png_bytep row
));
3272 #if defined(PNG_READ_16_TO_8_SUPPORTED)
3273 PNG_EXTERN
void png_do_chop
PNGARG((png_row_infop row_info
, png_bytep row
));
3276 #if defined(PNG_READ_DITHER_SUPPORTED)
3277 PNG_EXTERN
void png_do_dither
PNGARG((png_row_infop row_info
,
3278 png_bytep row
, png_bytep palette_lookup
, png_bytep dither_lookup
));
3280 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3281 PNG_EXTERN
void png_correct_palette
PNGARG((png_structp png_ptr
,
3282 png_colorp palette
, int num_palette
));
3286 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3287 PNG_EXTERN
void png_do_bgr
PNGARG((png_row_infop row_info
, png_bytep row
));
3290 #if defined(PNG_WRITE_PACK_SUPPORTED)
3291 PNG_EXTERN
void png_do_pack
PNGARG((png_row_infop row_info
,
3292 png_bytep row
, png_uint_32 bit_depth
));
3295 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
3296 PNG_EXTERN
void png_do_shift
PNGARG((png_row_infop row_info
, png_bytep row
,
3297 png_color_8p bit_depth
));
3300 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
3301 #if defined(PNG_READ_GAMMA_SUPPORTED)
3302 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3303 png_color_16p trans_values
, png_color_16p background
,
3304 png_color_16p background_1
,
3305 png_bytep gamma_table
, png_bytep gamma_from_1
, png_bytep gamma_to_1
,
3306 png_uint_16pp gamma_16
, png_uint_16pp gamma_16_from_1
,
3307 png_uint_16pp gamma_16_to_1
, int gamma_shift
));
3309 PNG_EXTERN
void png_do_background
PNGARG((png_row_infop row_info
, png_bytep row
,
3310 png_color_16p trans_values
, png_color_16p background
));
3314 #if defined(PNG_READ_GAMMA_SUPPORTED)
3315 PNG_EXTERN
void png_do_gamma
PNGARG((png_row_infop row_info
, png_bytep row
,
3316 png_bytep gamma_table
, png_uint_16pp gamma_16_table
,
3320 #if defined(PNG_READ_EXPAND_SUPPORTED)
3321 PNG_EXTERN
void png_do_expand_palette
PNGARG((png_row_infop row_info
,
3322 png_bytep row
, png_colorp palette
, png_bytep trans
, int num_trans
));
3323 PNG_EXTERN
void png_do_expand
PNGARG((png_row_infop row_info
,
3324 png_bytep row
, png_color_16p trans_value
));
3327 /* The following decodes the appropriate chunks, and does error correction,
3328 * then calls the appropriate callback for the chunk if it is valid.
3331 /* decode the IHDR chunk */
3332 PNG_EXTERN
void png_handle_IHDR
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3333 png_uint_32 length
));
3334 PNG_EXTERN
void png_handle_PLTE
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3335 png_uint_32 length
));
3336 PNG_EXTERN
void png_handle_IEND
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3337 png_uint_32 length
));
3339 #if defined(PNG_READ_bKGD_SUPPORTED)
3340 PNG_EXTERN
void png_handle_bKGD
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3341 png_uint_32 length
));
3344 #if defined(PNG_READ_cHRM_SUPPORTED)
3345 PNG_EXTERN
void png_handle_cHRM
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3346 png_uint_32 length
));
3349 #if defined(PNG_READ_gAMA_SUPPORTED)
3350 PNG_EXTERN
void png_handle_gAMA
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3351 png_uint_32 length
));
3354 #if defined(PNG_READ_hIST_SUPPORTED)
3355 PNG_EXTERN
void png_handle_hIST
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3356 png_uint_32 length
));
3359 #if defined(PNG_READ_iCCP_SUPPORTED)
3360 extern void png_handle_iCCP
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3361 png_uint_32 length
));
3362 #endif /* PNG_READ_iCCP_SUPPORTED */
3364 #if defined(PNG_READ_iTXt_SUPPORTED)
3365 PNG_EXTERN
void png_handle_iTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3366 png_uint_32 length
));
3369 #if defined(PNG_READ_oFFs_SUPPORTED)
3370 PNG_EXTERN
void png_handle_oFFs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3371 png_uint_32 length
));
3374 #if defined(PNG_READ_pCAL_SUPPORTED)
3375 PNG_EXTERN
void png_handle_pCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3376 png_uint_32 length
));
3379 #if defined(PNG_READ_pHYs_SUPPORTED)
3380 PNG_EXTERN
void png_handle_pHYs
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3381 png_uint_32 length
));
3384 #if defined(PNG_READ_sBIT_SUPPORTED)
3385 PNG_EXTERN
void png_handle_sBIT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3386 png_uint_32 length
));
3389 #if defined(PNG_READ_sCAL_SUPPORTED)
3390 PNG_EXTERN
void png_handle_sCAL
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3391 png_uint_32 length
));
3394 #if defined(PNG_READ_sPLT_SUPPORTED)
3395 extern void png_handle_sPLT
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3396 png_uint_32 length
));
3397 #endif /* PNG_READ_sPLT_SUPPORTED */
3399 #if defined(PNG_READ_sRGB_SUPPORTED)
3400 PNG_EXTERN
void png_handle_sRGB
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3401 png_uint_32 length
));
3404 #if defined(PNG_READ_tEXt_SUPPORTED)
3405 PNG_EXTERN
void png_handle_tEXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3406 png_uint_32 length
));
3409 #if defined(PNG_READ_tIME_SUPPORTED)
3410 PNG_EXTERN
void png_handle_tIME
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3411 png_uint_32 length
));
3414 #if defined(PNG_READ_tRNS_SUPPORTED)
3415 PNG_EXTERN
void png_handle_tRNS
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3416 png_uint_32 length
));
3419 #if defined(PNG_READ_zTXt_SUPPORTED)
3420 PNG_EXTERN
void png_handle_zTXt
PNGARG((png_structp png_ptr
, png_infop info_ptr
,
3421 png_uint_32 length
));
3424 PNG_EXTERN
void png_handle_unknown
PNGARG((png_structp png_ptr
,
3425 png_infop info_ptr
, png_uint_32 length
));
3427 PNG_EXTERN
void png_check_chunk_name
PNGARG((png_structp png_ptr
,
3428 png_bytep chunk_name
));
3430 /* handle the transformations for reading and writing */
3431 PNG_EXTERN
void png_do_read_transformations
PNGARG((png_structp png_ptr
));
3432 PNG_EXTERN
void png_do_write_transformations
PNGARG((png_structp png_ptr
));
3434 PNG_EXTERN
void png_init_read_transformations
PNGARG((png_structp png_ptr
));
3436 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3437 PNG_EXTERN
void png_push_read_chunk
PNGARG((png_structp png_ptr
,
3438 png_infop info_ptr
));
3439 PNG_EXTERN
void png_push_read_sig
PNGARG((png_structp png_ptr
,
3440 png_infop info_ptr
));
3441 PNG_EXTERN
void png_push_check_crc
PNGARG((png_structp png_ptr
));
3442 PNG_EXTERN
void png_push_crc_skip
PNGARG((png_structp png_ptr
,
3443 png_uint_32 length
));
3444 PNG_EXTERN
void png_push_crc_finish
PNGARG((png_structp png_ptr
));
3445 PNG_EXTERN
void png_push_save_buffer
PNGARG((png_structp png_ptr
));
3446 PNG_EXTERN
void png_push_restore_buffer
PNGARG((png_structp png_ptr
,
3447 png_bytep buffer
, png_size_t buffer_length
));
3448 PNG_EXTERN
void png_push_read_IDAT
PNGARG((png_structp png_ptr
));
3449 PNG_EXTERN
void png_process_IDAT_data
PNGARG((png_structp png_ptr
,
3450 png_bytep buffer
, png_size_t buffer_length
));
3451 PNG_EXTERN
void png_push_process_row
PNGARG((png_structp png_ptr
));
3452 PNG_EXTERN
void png_push_handle_unknown
PNGARG((png_structp png_ptr
,
3453 png_infop info_ptr
, png_uint_32 length
));
3454 PNG_EXTERN
void png_push_have_info
PNGARG((png_structp png_ptr
,
3455 png_infop info_ptr
));
3456 PNG_EXTERN
void png_push_have_end
PNGARG((png_structp png_ptr
,
3457 png_infop info_ptr
));
3458 PNG_EXTERN
void png_push_have_row
PNGARG((png_structp png_ptr
, png_bytep row
));
3459 PNG_EXTERN
void png_push_read_end
PNGARG((png_structp png_ptr
,
3460 png_infop info_ptr
));
3461 PNG_EXTERN
void png_process_some_data
PNGARG((png_structp png_ptr
,
3462 png_infop info_ptr
));
3463 PNG_EXTERN
void png_read_push_finish_row
PNGARG((png_structp png_ptr
));
3464 #if defined(PNG_READ_tEXt_SUPPORTED)
3465 PNG_EXTERN
void png_push_handle_tEXt
PNGARG((png_structp png_ptr
,
3466 png_infop info_ptr
, png_uint_32 length
));
3467 PNG_EXTERN
void png_push_read_tEXt
PNGARG((png_structp png_ptr
,
3468 png_infop info_ptr
));
3470 #if defined(PNG_READ_zTXt_SUPPORTED)
3471 PNG_EXTERN
void png_push_handle_zTXt
PNGARG((png_structp png_ptr
,
3472 png_infop info_ptr
, png_uint_32 length
));
3473 PNG_EXTERN
void png_push_read_zTXt
PNGARG((png_structp png_ptr
,
3474 png_infop info_ptr
));
3476 #if defined(PNG_READ_iTXt_SUPPORTED)
3477 PNG_EXTERN
void png_push_handle_iTXt
PNGARG((png_structp png_ptr
,
3478 png_infop info_ptr
, png_uint_32 length
));
3479 PNG_EXTERN
void png_push_read_iTXt
PNGARG((png_structp png_ptr
,
3480 png_infop info_ptr
));
3483 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3485 #ifdef PNG_MNG_FEATURES_SUPPORTED
3486 PNG_EXTERN
void png_do_read_intrapixel
PNGARG((png_row_infop row_info
,
3488 PNG_EXTERN
void png_do_write_intrapixel
PNGARG((png_row_infop row_info
,
3492 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3493 #if defined(PNG_MMX_CODE_SUPPORTED)
3494 /* png.c */ /* PRIVATE */
3495 PNG_EXTERN
void png_init_mmx_flags
PNGARG((png_structp png_ptr
));
3499 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3500 PNG_EXTERN png_uint_32 png_get_pixels_per_inch
PNGARG((png_structp png_ptr
,
3501 png_infop info_ptr
));
3503 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch
PNGARG((png_structp png_ptr
,
3504 png_infop info_ptr
));
3506 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch
PNGARG((png_structp png_ptr
,
3507 png_infop info_ptr
));
3509 PNG_EXTERN
float png_get_x_offset_inches
PNGARG((png_structp png_ptr
,
3510 png_infop info_ptr
));
3512 PNG_EXTERN
float png_get_y_offset_inches
PNGARG((png_structp png_ptr
,
3513 png_infop info_ptr
));
3515 #if defined(PNG_pHYs_SUPPORTED)
3516 PNG_EXTERN png_uint_32 png_get_pHYs_dpi
PNGARG((png_structp png_ptr
,
3517 png_infop info_ptr
, png_uint_32
*res_x
, png_uint_32
*res_y
, int *unit_type
));
3518 #endif /* PNG_pHYs_SUPPORTED */
3519 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3521 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3523 #endif /* PNG_INTERNAL */
3529 #endif /* PNG_VERSION_INFO_ONLY */
3530 /* do not put anything past this line */
projects / wxWidgets.git / blob