source: liacs/MIR2010/SourceCode/cximage/png/png.h@ 376

Last change on this file since 376 was 95, checked in by Rick van der Zwet, 15 years ago

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[95]1
2/* png.h - header file for PNG reference library
3 *
4 * libpng version 1.2.18 - May 15, 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.)
8 *
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 1.2.18 - May 15, 2007: Glenn
13 * See also "Contributing Authors", below.
14 *
15 * Note about libpng version numbers:
16 *
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:
22 *
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
32 * 0.98 0.98 98 2.0.98
33 * 0.99 0.99 98 2.0.99
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.
41 * 1.0.3 10003
42 * 1.0.3a-d 10004
43 * 1.0.4 10004
44 * 1.0.4a-f 10005
45 * 1.0.5 (+ 2 patches) 10005
46 * 1.0.5a-d 10006
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)
51 * 1.0.6g 10007
52 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
53 * 1.0.6i 10007 10.6i
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 *
154 * Henceforth the source version will match the shared-library major
155 * and minor numbers; the shared-library major version number will be
156 * used for changes in backward compatibility, as it is intended. The
157 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
158 * for applications, is an unsigned integer of the form xyyzz corresponding
159 * to the source version x.y.z (leading zeros in y and z). Beta versions
160 * were given the previous public release number plus a letter, until
161 * version 1.0.6j; from then on they were given the upcoming public
162 * release number plus "betaNN" or "rcN".
163 *
164 * Binary incompatibility exists only when applications make direct access
165 * to the info_ptr or png_ptr members through png.h, and the compiled
166 * application is loaded with a different version of the library.
167 *
168 * DLLNUM will change each time there are forward or backward changes
169 * in binary compatibility (e.g., when a new feature is added).
170 *
171 * See libpng.txt or libpng.3 for more information. The PNG specification
172 * is available as a W3C Recommendation and as an ISO Specification,
173 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
174 */
175
176/*
177 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
178 *
179 * If you modify libpng you may insert additional notices immediately following
180 * this sentence.
181 *
182 * libpng versions 1.2.6, August 15, 2004, through 1.2.18, May 15, 2007, are
183 * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
184 * distributed according to the same disclaimer and license as libpng-1.2.5
185 * with the following individual added to the list of Contributing Authors:
186 *
187 * Cosmin Truta
188 *
189 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
190 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
191 * distributed according to the same disclaimer and license as libpng-1.0.6
192 * with the following individuals added to the list of Contributing Authors:
193 *
194 * Simon-Pierre Cadieux
195 * Eric S. Raymond
196 * Gilles Vollant
197 *
198 * and with the following additions to the disclaimer:
199 *
200 * There is no warranty against interference with your enjoyment of the
201 * library or against infringement. There is no warranty that our
202 * efforts or the library will fulfill any of your particular purposes
203 * or needs. This library is provided with all faults, and the entire
204 * risk of satisfactory quality, performance, accuracy, and effort is with
205 * the user.
206 *
207 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
208 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
209 * distributed according to the same disclaimer and license as libpng-0.96,
210 * with the following individuals added to the list of Contributing Authors:
211 *
212 * Tom Lane
213 * Glenn Randers-Pehrson
214 * Willem van Schaik
215 *
216 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
217 * Copyright (c) 1996, 1997 Andreas Dilger
218 * Distributed according to the same disclaimer and license as libpng-0.88,
219 * with the following individuals added to the list of Contributing Authors:
220 *
221 * John Bowler
222 * Kevin Bracey
223 * Sam Bushell
224 * Magnus Holmgren
225 * Greg Roelofs
226 * Tom Tanner
227 *
228 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
229 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
230 *
231 * For the purposes of this copyright and license, "Contributing Authors"
232 * is defined as the following set of individuals:
233 *
234 * Andreas Dilger
235 * Dave Martindale
236 * Guy Eric Schalnat
237 * Paul Schmidt
238 * Tim Wegner
239 *
240 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
241 * and Group 42, Inc. disclaim all warranties, expressed or implied,
242 * including, without limitation, the warranties of merchantability and of
243 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
244 * assume no liability for direct, indirect, incidental, special, exemplary,
245 * or consequential damages, which may result from the use of the PNG
246 * Reference Library, even if advised of the possibility of such damage.
247 *
248 * Permission is hereby granted to use, copy, modify, and distribute this
249 * source code, or portions hereof, for any purpose, without fee, subject
250 * to the following restrictions:
251 *
252 * 1. The origin of this source code must not be misrepresented.
253 *
254 * 2. Altered versions must be plainly marked as such and
255 * must not be misrepresented as being the original source.
256 *
257 * 3. This Copyright notice may not be removed or altered from
258 * any source or altered source distribution.
259 *
260 * The Contributing Authors and Group 42, Inc. specifically permit, without
261 * fee, and encourage the use of this source code as a component to
262 * supporting the PNG file format in commercial products. If you use this
263 * source code in a product, acknowledgment is not required but would be
264 * appreciated.
265 */
266
267/*
268 * A "png_get_copyright" function is available, for convenient use in "about"
269 * boxes and the like:
270 *
271 * printf("%s",png_get_copyright(NULL));
272 *
273 * Also, the PNG logo (in PNG format, of course) is supplied in the
274 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
275 */
276
277/*
278 * Libpng is OSI Certified Open Source Software. OSI Certified is a
279 * certification mark of the Open Source Initiative.
280 */
281
282/*
283 * The contributing authors would like to thank all those who helped
284 * with testing, bug fixes, and patience. This wouldn't have been
285 * possible without all of you.
286 *
287 * Thanks to Frank J. T. Wojcik for helping with the documentation.
288 */
289
290/*
291 * Y2K compliance in libpng:
292 * =========================
293 *
294 * May 15, 2007
295 *
296 * Since the PNG Development group is an ad-hoc body, we can't make
297 * an official declaration.
298 *
299 * This is your unofficial assurance that libpng from version 0.71 and
300 * upward through 1.2.18 are Y2K compliant. It is my belief that earlier
301 * versions were also Y2K compliant.
302 *
303 * Libpng only has three year fields. One is a 2-byte unsigned integer
304 * that will hold years up to 65535. The other two hold the date in text
305 * format, and will hold years up to 9999.
306 *
307 * The integer is
308 * "png_uint_16 year" in png_time_struct.
309 *
310 * The strings are
311 * "png_charp time_buffer" in png_struct and
312 * "near_time_buffer", which is a local character string in png.c.
313 *
314 * There are seven time-related functions:
315 * png.c: png_convert_to_rfc_1123() in png.c
316 * (formerly png_convert_to_rfc_1152() in error)
317 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
318 * png_convert_from_time_t() in pngwrite.c
319 * png_get_tIME() in pngget.c
320 * png_handle_tIME() in pngrutil.c, called in pngread.c
321 * png_set_tIME() in pngset.c
322 * png_write_tIME() in pngwutil.c, called in pngwrite.c
323 *
324 * All handle dates properly in a Y2K environment. The
325 * png_convert_from_time_t() function calls gmtime() to convert from system
326 * clock time, which returns (year - 1900), which we properly convert to
327 * the full 4-digit year. There is a possibility that applications using
328 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
329 * function, or that they are incorrectly passing only a 2-digit year
330 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
331 * but this is not under our control. The libpng documentation has always
332 * stated that it works with 4-digit years, and the APIs have been
333 * documented as such.
334 *
335 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
336 * integer to hold the year, and can hold years as large as 65535.
337 *
338 * zlib, upon which libpng depends, is also Y2K compliant. It contains
339 * no date-related code.
340 *
341 * Glenn Randers-Pehrson
342 * libpng maintainer
343 * PNG Development Group
344 */
345
346#ifndef PNG_H
347#define PNG_H
348
349/* This is not the place to learn how to use libpng. The file libpng.txt
350 * describes how to use libpng, and the file example.c summarizes it
351 * with some code on which to build. This file is useful for looking
352 * at the actual function definitions and structure components.
353 */
354
355/* Version information for png.h - this should match the version in png.c */
356#define PNG_LIBPNG_VER_STRING "1.2.18"
357#define PNG_HEADER_VERSION_STRING \
358 " libpng version 1.2.18 - May 15, 2007 (header)\n"
359
360#define PNG_LIBPNG_VER_SONUM 0
361#define PNG_LIBPNG_VER_DLLNUM 13
362
363/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
364#define PNG_LIBPNG_VER_MAJOR 1
365#define PNG_LIBPNG_VER_MINOR 2
366#define PNG_LIBPNG_VER_RELEASE 18
367/* This should match the numeric part of the final component of
368 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
369
370#define PNG_LIBPNG_VER_BUILD 0
371
372/* Release Status */
373#define PNG_LIBPNG_BUILD_ALPHA 1
374#define PNG_LIBPNG_BUILD_BETA 2
375#define PNG_LIBPNG_BUILD_RC 3
376#define PNG_LIBPNG_BUILD_STABLE 4
377#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
378
379/* Release-Specific Flags */
380#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
381 PNG_LIBPNG_BUILD_STABLE only */
382#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
383 PNG_LIBPNG_BUILD_SPECIAL */
384#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
385 PNG_LIBPNG_BUILD_PRIVATE */
386
387#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
388
389/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
390 * We must not include leading zeros.
391 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
392 * version 1.0.0 was mis-numbered 100 instead of 10000). From
393 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
394#define PNG_LIBPNG_VER 10218 /* 1.2.18 */
395
396#ifndef PNG_VERSION_INFO_ONLY
397/* include the compression library's header */
398// BT: edit path
399#include "../zlib/zlib.h"
400#endif
401
402/* include all user configurable info, including optional assembler routines */
403#include "pngconf.h"
404
405/*
406 * Added at libpng-1.2.8 */
407/* Ref MSDN: Private as priority over Special
408 * VS_FF_PRIVATEBUILD File *was not* built using standard release
409 * procedures. If this value is given, the StringFileInfo block must
410 * contain a PrivateBuild string.
411 *
412 * VS_FF_SPECIALBUILD File *was* built by the original company using
413 * standard release procedures but is a variation of the standard
414 * file of the same version number. If this value is given, the
415 * StringFileInfo block must contain a SpecialBuild string.
416 */
417
418#if defined(PNG_USER_PRIVATEBUILD)
419# define PNG_LIBPNG_BUILD_TYPE \
420 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
421#else
422# if defined(PNG_LIBPNG_SPECIALBUILD)
423# define PNG_LIBPNG_BUILD_TYPE \
424 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
425# else
426# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
427# endif
428#endif
429
430#ifndef PNG_VERSION_INFO_ONLY
431
432/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
433#ifdef __cplusplus
434extern "C" {
435#endif /* __cplusplus */
436
437/* This file is arranged in several sections. The first section contains
438 * structure and type definitions. The second section contains the external
439 * library functions, while the third has the internal library functions,
440 * which applications aren't expected to use directly.
441 */
442
443#ifndef PNG_NO_TYPECAST_NULL
444#define int_p_NULL (int *)NULL
445#define png_bytep_NULL (png_bytep)NULL
446#define png_bytepp_NULL (png_bytepp)NULL
447#define png_doublep_NULL (png_doublep)NULL
448#define png_error_ptr_NULL (png_error_ptr)NULL
449#define png_flush_ptr_NULL (png_flush_ptr)NULL
450#define png_free_ptr_NULL (png_free_ptr)NULL
451#define png_infopp_NULL (png_infopp)NULL
452#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
453#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
454#define png_rw_ptr_NULL (png_rw_ptr)NULL
455#define png_structp_NULL (png_structp)NULL
456#define png_uint_16p_NULL (png_uint_16p)NULL
457#define png_voidp_NULL (png_voidp)NULL
458#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
459#else
460#define int_p_NULL NULL
461#define png_bytep_NULL NULL
462#define png_bytepp_NULL NULL
463#define png_doublep_NULL NULL
464#define png_error_ptr_NULL NULL
465#define png_flush_ptr_NULL NULL
466#define png_free_ptr_NULL NULL
467#define png_infopp_NULL NULL
468#define png_malloc_ptr_NULL NULL
469#define png_read_status_ptr_NULL NULL
470#define png_rw_ptr_NULL NULL
471#define png_structp_NULL NULL
472#define png_uint_16p_NULL NULL
473#define png_voidp_NULL NULL
474#define png_write_status_ptr_NULL NULL
475#endif
476
477/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
478#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
479/* Version information for C files, stored in png.c. This had better match
480 * the version above.
481 */
482#ifdef PNG_USE_GLOBAL_ARRAYS
483PNG_EXPORT_VAR (const char) png_libpng_ver[18];
484 /* need room for 99.99.99beta99z */
485#else
486#define png_libpng_ver png_get_header_ver(NULL)
487#endif
488
489#ifdef PNG_USE_GLOBAL_ARRAYS
490/* This was removed in version 1.0.5c */
491/* Structures to facilitate easy interlacing. See png.c for more details */
492PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
493PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
494PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
495PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
496PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
497PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
498#ifdef PNG_USE_PNGGCCRD
499PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
500#endif
501/* This isn't currently used. If you need it, see png.c for more details.
502PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
503*/
504#endif
505
506#endif /* PNG_NO_EXTERN */
507
508/* Three color definitions. The order of the red, green, and blue, (and the
509 * exact size) is not important, although the size of the fields need to
510 * be png_byte or png_uint_16 (as defined below).
511 */
512typedef struct png_color_struct
513{
514 png_byte red;
515 png_byte green;
516 png_byte blue;
517} png_color;
518typedef png_color FAR * png_colorp;
519typedef png_color FAR * FAR * png_colorpp;
520
521typedef struct png_color_16_struct
522{
523 png_byte index; /* used for palette files */
524 png_uint_16 red; /* for use in red green blue files */
525 png_uint_16 green;
526 png_uint_16 blue;
527 png_uint_16 gray; /* for use in grayscale files */
528} png_color_16;
529typedef png_color_16 FAR * png_color_16p;
530typedef png_color_16 FAR * FAR * png_color_16pp;
531
532typedef struct png_color_8_struct
533{
534 png_byte red; /* for use in red green blue files */
535 png_byte green;
536 png_byte blue;
537 png_byte gray; /* for use in grayscale files */
538 png_byte alpha; /* for alpha channel files */
539} png_color_8;
540typedef png_color_8 FAR * png_color_8p;
541typedef png_color_8 FAR * FAR * png_color_8pp;
542
543/*
544 * The following two structures are used for the in-core representation
545 * of sPLT chunks.
546 */
547typedef struct png_sPLT_entry_struct
548{
549 png_uint_16 red;
550 png_uint_16 green;
551 png_uint_16 blue;
552 png_uint_16 alpha;
553 png_uint_16 frequency;
554} png_sPLT_entry;
555typedef png_sPLT_entry FAR * png_sPLT_entryp;
556typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
557
558/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
559 * occupy the LSB of their respective members, and the MSB of each member
560 * is zero-filled. The frequency member always occupies the full 16 bits.
561 */
562
563typedef struct png_sPLT_struct
564{
565 png_charp name; /* palette name */
566 png_byte depth; /* depth of palette samples */
567 png_sPLT_entryp entries; /* palette entries */
568 png_int_32 nentries; /* number of palette entries */
569} png_sPLT_t;
570typedef png_sPLT_t FAR * png_sPLT_tp;
571typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
572
573#ifdef PNG_TEXT_SUPPORTED
574/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
575 * and whether that contents is compressed or not. The "key" field
576 * points to a regular zero-terminated C string. The "text", "lang", and
577 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
578 * However, the * structure returned by png_get_text() will always contain
579 * regular zero-terminated C strings (possibly empty), never NULL pointers,
580 * so they can be safely used in printf() and other string-handling functions.
581 */
582typedef struct png_text_struct
583{
584 int compression; /* compression value:
585 -1: tEXt, none
586 0: zTXt, deflate
587 1: iTXt, none
588 2: iTXt, deflate */
589 png_charp key; /* keyword, 1-79 character description of "text" */
590 png_charp text; /* comment, may be an empty string (ie "")
591 or a NULL pointer */
592 png_size_t text_length; /* length of the text string */
593#ifdef PNG_iTXt_SUPPORTED
594 png_size_t itxt_length; /* length of the itxt string */
595 png_charp lang; /* language code, 0-79 characters
596 or a NULL pointer */
597 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
598 chars or a NULL pointer */
599#endif
600} png_text;
601typedef png_text FAR * png_textp;
602typedef png_text FAR * FAR * png_textpp;
603#endif
604
605/* Supported compression types for text in PNG files (tEXt, and zTXt).
606 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
607#define PNG_TEXT_COMPRESSION_NONE_WR -3
608#define PNG_TEXT_COMPRESSION_zTXt_WR -2
609#define PNG_TEXT_COMPRESSION_NONE -1
610#define PNG_TEXT_COMPRESSION_zTXt 0
611#define PNG_ITXT_COMPRESSION_NONE 1
612#define PNG_ITXT_COMPRESSION_zTXt 2
613#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
614
615/* png_time is a way to hold the time in an machine independent way.
616 * Two conversions are provided, both from time_t and struct tm. There
617 * is no portable way to convert to either of these structures, as far
618 * as I know. If you know of a portable way, send it to me. As a side
619 * note - PNG has always been Year 2000 compliant!
620 */
621typedef struct png_time_struct
622{
623 png_uint_16 year; /* full year, as in, 1995 */
624 png_byte month; /* month of year, 1 - 12 */
625 png_byte day; /* day of month, 1 - 31 */
626 png_byte hour; /* hour of day, 0 - 23 */
627 png_byte minute; /* minute of hour, 0 - 59 */
628 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
629} png_time;
630typedef png_time FAR * png_timep;
631typedef png_time FAR * FAR * png_timepp;
632
633#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
634/* png_unknown_chunk is a structure to hold queued chunks for which there is
635 * no specific support. The idea is that we can use this to queue
636 * up private chunks for output even though the library doesn't actually
637 * know about their semantics.
638 */
639typedef struct png_unknown_chunk_t
640{
641 png_byte name[5];
642 png_byte *data;
643 png_size_t size;
644
645 /* libpng-using applications should NOT directly modify this byte. */
646 png_byte location; /* mode of operation at read time */
647}
648png_unknown_chunk;
649typedef png_unknown_chunk FAR * png_unknown_chunkp;
650typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
651#endif
652
653/* png_info is a structure that holds the information in a PNG file so
654 * that the application can find out the characteristics of the image.
655 * If you are reading the file, this structure will tell you what is
656 * in the PNG file. If you are writing the file, fill in the information
657 * you want to put into the PNG file, then call png_write_info().
658 * The names chosen should be very close to the PNG specification, so
659 * consult that document for information about the meaning of each field.
660 *
661 * With libpng < 0.95, it was only possible to directly set and read the
662 * the values in the png_info_struct, which meant that the contents and
663 * order of the values had to remain fixed. With libpng 0.95 and later,
664 * however, there are now functions that abstract the contents of
665 * png_info_struct from the application, so this makes it easier to use
666 * libpng with dynamic libraries, and even makes it possible to use
667 * libraries that don't have all of the libpng ancillary chunk-handing
668 * functionality.
669 *
670 * In any case, the order of the parameters in png_info_struct should NOT
671 * be changed for as long as possible to keep compatibility with applications
672 * that use the old direct-access method with png_info_struct.
673 *
674 * The following members may have allocated storage attached that should be
675 * cleaned up before the structure is discarded: palette, trans, text,
676 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
677 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
678 * are automatically freed when the info structure is deallocated, if they were
679 * allocated internally by libpng. This behavior can be changed by means
680 * of the png_data_freer() function.
681 *
682 * More allocation details: all the chunk-reading functions that
683 * change these members go through the corresponding png_set_*
684 * functions. A function to clear these members is available: see
685 * png_free_data(). The png_set_* functions do not depend on being
686 * able to point info structure members to any of the storage they are
687 * passed (they make their own copies), EXCEPT that the png_set_text
688 * functions use the same storage passed to them in the text_ptr or
689 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
690 * functions do not make their own copies.
691 */
692typedef struct png_info_struct
693{
694 /* the following are necessary for every PNG file */
695 png_uint_32 width; /* width of image in pixels (from IHDR) */
696 png_uint_32 height; /* height of image in pixels (from IHDR) */
697 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
698 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
699 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
700 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
701 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
702 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
703 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
704 /* The following three should have been named *_method not *_type */
705 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
706 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
707 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
708
709 /* The following is informational only on read, and not used on writes. */
710 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
711 png_byte pixel_depth; /* number of bits per pixel */
712 png_byte spare_byte; /* to align the data, and for future use */
713 png_byte signature[8]; /* magic bytes read by libpng from start of file */
714
715 /* The rest of the data is optional. If you are reading, check the
716 * valid field to see if the information in these are valid. If you
717 * are writing, set the valid field to those chunks you want written,
718 * and initialize the appropriate fields below.
719 */
720
721#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
722 /* The gAMA chunk describes the gamma characteristics of the system
723 * on which the image was created, normally in the range [1.0, 2.5].
724 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
725 */
726 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
727#endif
728
729#if defined(PNG_sRGB_SUPPORTED)
730 /* GR-P, 0.96a */
731 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
732 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
733#endif
734
735#if defined(PNG_TEXT_SUPPORTED)
736 /* The tEXt, and zTXt chunks contain human-readable textual data in
737 * uncompressed, compressed, and optionally compressed forms, respectively.
738 * The data in "text" is an array of pointers to uncompressed,
739 * null-terminated C strings. Each chunk has a keyword that describes the
740 * textual data contained in that chunk. Keywords are not required to be
741 * unique, and the text string may be empty. Any number of text chunks may
742 * be in an image.
743 */
744 int num_text; /* number of comments read/to write */
745 int max_text; /* current size of text array */
746 png_textp text; /* array of comments read/to write */
747#endif /* PNG_TEXT_SUPPORTED */
748
749#if defined(PNG_tIME_SUPPORTED)
750 /* The tIME chunk holds the last time the displayed image data was
751 * modified. See the png_time struct for the contents of this struct.
752 */
753 png_time mod_time;
754#endif
755
756#if defined(PNG_sBIT_SUPPORTED)
757 /* The sBIT chunk specifies the number of significant high-order bits
758 * in the pixel data. Values are in the range [1, bit_depth], and are
759 * only specified for the channels in the pixel data. The contents of
760 * the low-order bits is not specified. Data is valid if
761 * (valid & PNG_INFO_sBIT) is non-zero.
762 */
763 png_color_8 sig_bit; /* significant bits in color channels */
764#endif
765
766#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
767defined(PNG_READ_BACKGROUND_SUPPORTED)
768 /* The tRNS chunk supplies transparency data for paletted images and
769 * other image types that don't need a full alpha channel. There are
770 * "num_trans" transparency values for a paletted image, stored in the
771 * same order as the palette colors, starting from index 0. Values
772 * for the data are in the range [0, 255], ranging from fully transparent
773 * to fully opaque, respectively. For non-paletted images, there is a
774 * single color specified that should be treated as fully transparent.
775 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
776 */
777 png_bytep trans; /* transparent values for paletted image */
778 png_color_16 trans_values; /* transparent color for non-palette image */
779#endif
780
781#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
782 /* The bKGD chunk gives the suggested image background color if the
783 * display program does not have its own background color and the image
784 * is needs to composited onto a background before display. The colors
785 * in "background" are normally in the same color space/depth as the
786 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
787 */
788 png_color_16 background;
789#endif
790
791#if defined(PNG_oFFs_SUPPORTED)
792 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
793 * and downwards from the top-left corner of the display, page, or other
794 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
795 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
796 */
797 png_int_32 x_offset; /* x offset on page */
798 png_int_32 y_offset; /* y offset on page */
799 png_byte offset_unit_type; /* offset units type */
800#endif
801
802#if defined(PNG_pHYs_SUPPORTED)
803 /* The pHYs chunk gives the physical pixel density of the image for
804 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
805 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
806 */
807 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
808 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
809 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
810#endif
811
812#if defined(PNG_hIST_SUPPORTED)
813 /* The hIST chunk contains the relative frequency or importance of the
814 * various palette entries, so that a viewer can intelligently select a
815 * reduced-color palette, if required. Data is an array of "num_palette"
816 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
817 * is non-zero.
818 */
819 png_uint_16p hist;
820#endif
821
822#ifdef PNG_cHRM_SUPPORTED
823 /* The cHRM chunk describes the CIE color characteristics of the monitor
824 * on which the PNG was created. This data allows the viewer to do gamut
825 * mapping of the input image to ensure that the viewer sees the same
826 * colors in the image as the creator. Values are in the range
827 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
828 */
829#ifdef PNG_FLOATING_POINT_SUPPORTED
830 float x_white;
831 float y_white;
832 float x_red;
833 float y_red;
834 float x_green;
835 float y_green;
836 float x_blue;
837 float y_blue;
838#endif
839#endif
840
841#if defined(PNG_pCAL_SUPPORTED)
842 /* The pCAL chunk describes a transformation between the stored pixel
843 * values and original physical data values used to create the image.
844 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
845 * range given by [pcal_X0, pcal_X1], and are further transformed by a
846 * (possibly non-linear) transformation function given by "pcal_type"
847 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
848 * defines below, and the PNG-Group's PNG extensions document for a
849 * complete description of the transformations and how they should be
850 * implemented, and for a description of the ASCII parameter strings.
851 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
852 */
853 png_charp pcal_purpose; /* pCAL chunk description string */
854 png_int_32 pcal_X0; /* minimum value */
855 png_int_32 pcal_X1; /* maximum value */
856 png_charp pcal_units; /* Latin-1 string giving physical units */
857 png_charpp pcal_params; /* ASCII strings containing parameter values */
858 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
859 png_byte pcal_nparams; /* number of parameters given in pcal_params */
860#endif
861
862/* New members added in libpng-1.0.6 */
863#ifdef PNG_FREE_ME_SUPPORTED
864 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
865#endif
866
867#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
868 /* storage for unknown chunks that the library doesn't recognize. */
869 png_unknown_chunkp unknown_chunks;
870 png_size_t unknown_chunks_num;
871#endif
872
873#if defined(PNG_iCCP_SUPPORTED)
874 /* iCCP chunk data. */
875 png_charp iccp_name; /* profile name */
876 png_charp iccp_profile; /* International Color Consortium profile data */
877 /* Note to maintainer: should be png_bytep */
878 png_uint_32 iccp_proflen; /* ICC profile data length */
879 png_byte iccp_compression; /* Always zero */
880#endif
881
882#if defined(PNG_sPLT_SUPPORTED)
883 /* data on sPLT chunks (there may be more than one). */
884 png_sPLT_tp splt_palettes;
885 png_uint_32 splt_palettes_num;
886#endif
887
888#if defined(PNG_sCAL_SUPPORTED)
889 /* The sCAL chunk describes the actual physical dimensions of the
890 * subject matter of the graphic. The chunk contains a unit specification
891 * a byte value, and two ASCII strings representing floating-point
892 * values. The values are width and height corresponsing to one pixel
893 * in the image. This external representation is converted to double
894 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
895 */
896 png_byte scal_unit; /* unit of physical scale */
897#ifdef PNG_FLOATING_POINT_SUPPORTED
898 double scal_pixel_width; /* width of one pixel */
899 double scal_pixel_height; /* height of one pixel */
900#endif
901#ifdef PNG_FIXED_POINT_SUPPORTED
902 png_charp scal_s_width; /* string containing height */
903 png_charp scal_s_height; /* string containing width */
904#endif
905#endif
906
907#if defined(PNG_INFO_IMAGE_SUPPORTED)
908 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
909 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
910 png_bytepp row_pointers; /* the image bits */
911#endif
912
913#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
914 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
915#endif
916
917#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
918 png_fixed_point int_x_white;
919 png_fixed_point int_y_white;
920 png_fixed_point int_x_red;
921 png_fixed_point int_y_red;
922 png_fixed_point int_x_green;
923 png_fixed_point int_y_green;
924 png_fixed_point int_x_blue;
925 png_fixed_point int_y_blue;
926#endif
927
928} png_info;
929
930typedef png_info FAR * png_infop;
931typedef png_info FAR * FAR * png_infopp;
932
933/* Maximum positive integer used in PNG is (2^31)-1 */
934#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
935#define PNG_UINT_32_MAX ((png_uint_32)(-1))
936#define PNG_SIZE_MAX ((png_size_t)(-1))
937#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
938/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
939#define PNG_MAX_UINT PNG_UINT_31_MAX
940#endif
941
942/* These describe the color_type field in png_info. */
943/* color type masks */
944#define PNG_COLOR_MASK_PALETTE 1
945#define PNG_COLOR_MASK_COLOR 2
946#define PNG_COLOR_MASK_ALPHA 4
947
948/* color types. Note that not all combinations are legal */
949#define PNG_COLOR_TYPE_GRAY 0
950#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
951#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
952#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
953#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
954/* aliases */
955#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
956#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
957
958/* This is for compression type. PNG 1.0-1.2 only define the single type. */
959#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
960#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
961
962/* This is for filter type. PNG 1.0-1.2 only define the single type. */
963#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
964#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
965#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
966
967/* These are for the interlacing type. These values should NOT be changed. */
968#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
969#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
970#define PNG_INTERLACE_LAST 2 /* Not a valid value */
971
972/* These are for the oFFs chunk. These values should NOT be changed. */
973#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
974#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
975#define PNG_OFFSET_LAST 2 /* Not a valid value */
976
977/* These are for the pCAL chunk. These values should NOT be changed. */
978#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
979#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
980#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
981#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
982#define PNG_EQUATION_LAST 4 /* Not a valid value */
983
984/* These are for the sCAL chunk. These values should NOT be changed. */
985#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
986#define PNG_SCALE_METER 1 /* meters per pixel */
987#define PNG_SCALE_RADIAN 2 /* radians per pixel */
988#define PNG_SCALE_LAST 3 /* Not a valid value */
989
990/* These are for the pHYs chunk. These values should NOT be changed. */
991#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
992#define PNG_RESOLUTION_METER 1 /* pixels/meter */
993#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
994
995/* These are for the sRGB chunk. These values should NOT be changed. */
996#define PNG_sRGB_INTENT_PERCEPTUAL 0
997#define PNG_sRGB_INTENT_RELATIVE 1
998#define PNG_sRGB_INTENT_SATURATION 2
999#define PNG_sRGB_INTENT_ABSOLUTE 3
1000#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1001
1002/* This is for text chunks */
1003#define PNG_KEYWORD_MAX_LENGTH 79
1004
1005/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1006#define PNG_MAX_PALETTE_LENGTH 256
1007
1008/* These determine if an ancillary chunk's data has been successfully read
1009 * from the PNG header, or if the application has filled in the corresponding
1010 * data in the info_struct to be written into the output file. The values
1011 * of the PNG_INFO_<chunk> defines should NOT be changed.
1012 */
1013#define PNG_INFO_gAMA 0x0001
1014#define PNG_INFO_sBIT 0x0002
1015#define PNG_INFO_cHRM 0x0004
1016#define PNG_INFO_PLTE 0x0008
1017#define PNG_INFO_tRNS 0x0010
1018#define PNG_INFO_bKGD 0x0020
1019#define PNG_INFO_hIST 0x0040
1020#define PNG_INFO_pHYs 0x0080
1021#define PNG_INFO_oFFs 0x0100
1022#define PNG_INFO_tIME 0x0200
1023#define PNG_INFO_pCAL 0x0400
1024#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1025#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1026#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1027#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1028#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1029
1030/* This is used for the transformation routines, as some of them
1031 * change these values for the row. It also should enable using
1032 * the routines for other purposes.
1033 */
1034typedef struct png_row_info_struct
1035{
1036 png_uint_32 width; /* width of row */
1037 png_uint_32 rowbytes; /* number of bytes in row */
1038 png_byte color_type; /* color type of row */
1039 png_byte bit_depth; /* bit depth of row */
1040 png_byte channels; /* number of channels (1, 2, 3, or 4) */
1041 png_byte pixel_depth; /* bits per pixel (depth * channels) */
1042} png_row_info;
1043
1044typedef png_row_info FAR * png_row_infop;
1045typedef png_row_info FAR * FAR * png_row_infopp;
1046
1047/* These are the function types for the I/O functions and for the functions
1048 * that allow the user to override the default I/O functions with his or her
1049 * own. The png_error_ptr type should match that of user-supplied warning
1050 * and error functions, while the png_rw_ptr type should match that of the
1051 * user read/write data functions.
1052 */
1053typedef struct png_struct_def png_struct;
1054typedef png_struct FAR * png_structp;
1055
1056typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1057typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1058typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1059typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1060 int));
1061typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1062 int));
1063
1064#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1065typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1066typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1067typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1068 png_uint_32, int));
1069#endif
1070
1071#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1072 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1073 defined(PNG_LEGACY_SUPPORTED)
1074typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1075 png_row_infop, png_bytep));
1076#endif
1077
1078#if defined(PNG_USER_CHUNKS_SUPPORTED)
1079typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1080#endif
1081#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1082typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1083#endif
1084
1085/* Transform masks for the high-level interface */
1086#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1087#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1088#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1089#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1090#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1091#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1092#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1093#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1094#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1095#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1096#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1097#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1098#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1099
1100/* Flags for MNG supported features */
1101#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1102#define PNG_FLAG_MNG_FILTER_64 0x04
1103#define PNG_ALL_MNG_FEATURES 0x05
1104
1105typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1106typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1107
1108/* The structure that holds the information to read and write PNG files.
1109 * The only people who need to care about what is inside of this are the
1110 * people who will be modifying the library for their own special needs.
1111 * It should NOT be accessed directly by an application, except to store
1112 * the jmp_buf.
1113 */
1114
1115struct png_struct_def
1116{
1117#ifdef PNG_SETJMP_SUPPORTED
1118 jmp_buf jmpbuf; /* used in png_error */
1119#endif
1120 png_error_ptr error_fn; /* function for printing errors and aborting */
1121 png_error_ptr warning_fn; /* function for printing warnings */
1122 png_voidp error_ptr; /* user supplied struct for error functions */
1123 png_rw_ptr write_data_fn; /* function for writing output data */
1124 png_rw_ptr read_data_fn; /* function for reading input data */
1125 png_voidp io_ptr; /* ptr to application struct for I/O functions */
1126
1127#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1128 png_user_transform_ptr read_user_transform_fn; /* user read transform */
1129#endif
1130
1131#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1132 png_user_transform_ptr write_user_transform_fn; /* user write transform */
1133#endif
1134
1135/* These were added in libpng-1.0.2 */
1136#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1137#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1138 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1139 png_voidp user_transform_ptr; /* user supplied struct for user transform */
1140 png_byte user_transform_depth; /* bit depth of user transformed pixels */
1141 png_byte user_transform_channels; /* channels in user transformed pixels */
1142#endif
1143#endif
1144
1145 png_uint_32 mode; /* tells us where we are in the PNG file */
1146 png_uint_32 flags; /* flags indicating various things to libpng */
1147 png_uint_32 transformations; /* which transformations to perform */
1148
1149 z_stream zstream; /* pointer to decompression structure (below) */
1150 png_bytep zbuf; /* buffer for zlib */
1151 png_size_t zbuf_size; /* size of zbuf */
1152 int zlib_level; /* holds zlib compression level */
1153 int zlib_method; /* holds zlib compression method */
1154 int zlib_window_bits; /* holds zlib compression window bits */
1155 int zlib_mem_level; /* holds zlib compression memory level */
1156 int zlib_strategy; /* holds zlib compression strategy */
1157
1158 png_uint_32 width; /* width of image in pixels */
1159 png_uint_32 height; /* height of image in pixels */
1160 png_uint_32 num_rows; /* number of rows in current pass */
1161 png_uint_32 usr_width; /* width of row at start of write */
1162 png_uint_32 rowbytes; /* size of row in bytes */
1163 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1164 png_uint_32 iwidth; /* width of current interlaced row in pixels */
1165 png_uint_32 row_number; /* current row in interlace pass */
1166 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1167 png_bytep row_buf; /* buffer to save current (unfiltered) row */
1168 png_bytep sub_row; /* buffer to save "sub" row when filtering */
1169 png_bytep up_row; /* buffer to save "up" row when filtering */
1170 png_bytep avg_row; /* buffer to save "avg" row when filtering */
1171 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1172 png_row_info row_info; /* used for transformation routines */
1173
1174 png_uint_32 idat_size; /* current IDAT size for read */
1175 png_uint_32 crc; /* current chunk CRC value */
1176 png_colorp palette; /* palette from the input file */
1177 png_uint_16 num_palette; /* number of color entries in palette */
1178 png_uint_16 num_trans; /* number of transparency values */
1179 png_byte chunk_name[5]; /* null-terminated name of current chunk */
1180 png_byte compression; /* file compression type (always 0) */
1181 png_byte filter; /* file filter type (always 0) */
1182 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1183 png_byte pass; /* current interlace pass (0 - 6) */
1184 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1185 png_byte color_type; /* color type of file */
1186 png_byte bit_depth; /* bit depth of file */
1187 png_byte usr_bit_depth; /* bit depth of users row */
1188 png_byte pixel_depth; /* number of bits per pixel */
1189 png_byte channels; /* number of channels in file */
1190 png_byte usr_channels; /* channels at start of write */
1191 png_byte sig_bytes; /* magic bytes read/written from start of file */
1192
1193#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1194#ifdef PNG_LEGACY_SUPPORTED
1195 png_byte filler; /* filler byte for pixel expansion */
1196#else
1197 png_uint_16 filler; /* filler bytes for pixel expansion */
1198#endif
1199#endif
1200
1201#if defined(PNG_bKGD_SUPPORTED)
1202 png_byte background_gamma_type;
1203# ifdef PNG_FLOATING_POINT_SUPPORTED
1204 float background_gamma;
1205# endif
1206 png_color_16 background; /* background color in screen gamma space */
1207#if defined(PNG_READ_GAMMA_SUPPORTED)
1208 png_color_16 background_1; /* background normalized to gamma 1.0 */
1209#endif
1210#endif /* PNG_bKGD_SUPPORTED */
1211
1212#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1213 png_flush_ptr output_flush_fn;/* Function for flushing output */
1214 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1215 png_uint_32 flush_rows; /* number of rows written since last flush */
1216#endif
1217
1218#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1219 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1220#ifdef PNG_FLOATING_POINT_SUPPORTED
1221 float gamma; /* file gamma value */
1222 float screen_gamma; /* screen gamma value (display_exponent) */
1223#endif
1224#endif
1225
1226#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1227 png_bytep gamma_table; /* gamma table for 8-bit depth files */
1228 png_bytep gamma_from_1; /* converts from 1.0 to screen */
1229 png_bytep gamma_to_1; /* converts from file to 1.0 */
1230 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1231 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1232 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1233#endif
1234
1235#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1236 png_color_8 sig_bit; /* significant bits in each available channel */
1237#endif
1238
1239#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1240 png_color_8 shift; /* shift for significant bit tranformation */
1241#endif
1242
1243#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1244 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1245 png_bytep trans; /* transparency values for paletted files */
1246 png_color_16 trans_values; /* transparency values for non-paletted files */
1247#endif
1248
1249 png_read_status_ptr read_row_fn; /* called after each row is decoded */
1250 png_write_status_ptr write_row_fn; /* called after each row is encoded */
1251#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1252 png_progressive_info_ptr info_fn; /* called after header data fully read */
1253 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1254 png_progressive_end_ptr end_fn; /* called after image is complete */
1255 png_bytep save_buffer_ptr; /* current location in save_buffer */
1256 png_bytep save_buffer; /* buffer for previously read data */
1257 png_bytep current_buffer_ptr; /* current location in current_buffer */
1258 png_bytep current_buffer; /* buffer for recently used data */
1259 png_uint_32 push_length; /* size of current input chunk */
1260 png_uint_32 skip_length; /* bytes to skip in input data */
1261 png_size_t save_buffer_size; /* amount of data now in save_buffer */
1262 png_size_t save_buffer_max; /* total size of save_buffer */
1263 png_size_t buffer_size; /* total amount of available input data */
1264 png_size_t current_buffer_size; /* amount of data now in current_buffer */
1265 int process_mode; /* what push library is currently doing */
1266 int cur_palette; /* current push library palette index */
1267
1268# if defined(PNG_TEXT_SUPPORTED)
1269 png_size_t current_text_size; /* current size of text input data */
1270 png_size_t current_text_left; /* how much text left to read in input */
1271 png_charp current_text; /* current text chunk buffer */
1272 png_charp current_text_ptr; /* current location in current_text */
1273# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
1274
1275#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1276
1277#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1278/* for the Borland special 64K segment handler */
1279 png_bytepp offset_table_ptr;
1280 png_bytep offset_table;
1281 png_uint_16 offset_table_number;
1282 png_uint_16 offset_table_count;
1283 png_uint_16 offset_table_count_free;
1284#endif
1285
1286#if defined(PNG_READ_DITHER_SUPPORTED)
1287 png_bytep palette_lookup; /* lookup table for dithering */
1288 png_bytep dither_index; /* index translation for palette files */
1289#endif
1290
1291#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1292 png_uint_16p hist; /* histogram */
1293#endif
1294
1295#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1296 png_byte heuristic_method; /* heuristic for row filter selection */
1297 png_byte num_prev_filters; /* number of weights for previous rows */
1298 png_bytep prev_filters; /* filter type(s) of previous row(s) */
1299 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1300 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1301 png_uint_16p filter_costs; /* relative filter calculation cost */
1302 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1303#endif
1304
1305#if defined(PNG_TIME_RFC1123_SUPPORTED)
1306 png_charp time_buffer; /* String to hold RFC 1123 time text */
1307#endif
1308
1309/* New members added in libpng-1.0.6 */
1310
1311#ifdef PNG_FREE_ME_SUPPORTED
1312 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1313#endif
1314
1315#if defined(PNG_USER_CHUNKS_SUPPORTED)
1316 png_voidp user_chunk_ptr;
1317 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1318#endif
1319
1320#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1321 int num_chunk_list;
1322 png_bytep chunk_list;
1323#endif
1324
1325/* New members added in libpng-1.0.3 */
1326#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1327 png_byte rgb_to_gray_status;
1328 /* These were changed from png_byte in libpng-1.0.6 */
1329 png_uint_16 rgb_to_gray_red_coeff;
1330 png_uint_16 rgb_to_gray_green_coeff;
1331 png_uint_16 rgb_to_gray_blue_coeff;
1332#endif
1333
1334/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1335#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1336 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1337 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1338/* changed from png_byte to png_uint_32 at version 1.2.0 */
1339#ifdef PNG_1_0_X
1340 png_byte mng_features_permitted;
1341#else
1342 png_uint_32 mng_features_permitted;
1343#endif /* PNG_1_0_X */
1344#endif
1345
1346/* New member added in libpng-1.0.7 */
1347#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1348 png_fixed_point int_gamma;
1349#endif
1350
1351/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1352#if defined(PNG_MNG_FEATURES_SUPPORTED)
1353 png_byte filter_type;
1354#endif
1355
1356#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
1357/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1358 png_uint_32 row_buf_size;
1359#endif
1360
1361/* New members added in libpng-1.2.0 */
1362#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1363# if !defined(PNG_1_0_X)
1364# if defined(PNG_MMX_CODE_SUPPORTED)
1365 png_byte mmx_bitdepth_threshold;
1366 png_uint_32 mmx_rowbytes_threshold;
1367# endif
1368 png_uint_32 asm_flags;
1369# endif
1370#endif
1371
1372/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1373#ifdef PNG_USER_MEM_SUPPORTED
1374 png_voidp mem_ptr; /* user supplied struct for mem functions */
1375 png_malloc_ptr malloc_fn; /* function for allocating memory */
1376 png_free_ptr free_fn; /* function for freeing memory */
1377#endif
1378
1379/* New member added in libpng-1.0.13 and 1.2.0 */
1380 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1381
1382#if defined(PNG_READ_DITHER_SUPPORTED)
1383/* The following three members were added at version 1.0.14 and 1.2.4 */
1384 png_bytep dither_sort; /* working sort array */
1385 png_bytep index_to_palette; /* where the original index currently is */
1386 /* in the palette */
1387 png_bytep palette_to_index; /* which original index points to this */
1388 /* palette color */
1389#endif
1390
1391/* New members added in libpng-1.0.16 and 1.2.6 */
1392 png_byte compression_type;
1393
1394#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1395 png_uint_32 user_width_max;
1396 png_uint_32 user_height_max;
1397#endif
1398
1399/* New member added in libpng-1.0.25 and 1.2.17 */
1400#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1401 /* storage for unknown chunk that the library doesn't recognize. */
1402 png_unknown_chunk unknown_chunk;
1403#endif
1404};
1405
1406
1407/* This triggers a compiler error in png.c, if png.c and png.h
1408 * do not agree upon the version number.
1409 */
1410typedef png_structp version_1_2_18;
1411
1412typedef png_struct FAR * FAR * png_structpp;
1413
1414/* Here are the function definitions most commonly used. This is not
1415 * the place to find out how to use libpng. See libpng.txt for the
1416 * full explanation, see example.c for the summary. This just provides
1417 * a simple one line description of the use of each function.
1418 */
1419
1420/* Returns the version number of the library */
1421extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1422
1423/* Tell lib we have already handled the first <num_bytes> magic bytes.
1424 * Handling more than 8 bytes from the beginning of the file is an error.
1425 */
1426extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1427 int num_bytes));
1428
1429/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1430 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1431 * signature, and non-zero otherwise. Having num_to_check == 0 or
1432 * start > 7 will always fail (ie return non-zero).
1433 */
1434extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1435 png_size_t num_to_check));
1436
1437/* Simple signature checking function. This is the same as calling
1438 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1439 */
1440extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1441
1442/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1443extern PNG_EXPORT(png_structp,png_create_read_struct)
1444 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1445 png_error_ptr error_fn, png_error_ptr warn_fn));
1446
1447/* Allocate and initialize png_ptr struct for writing, and any other memory */
1448extern PNG_EXPORT(png_structp,png_create_write_struct)
1449 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1450 png_error_ptr error_fn, png_error_ptr warn_fn));
1451
1452#ifdef PNG_WRITE_SUPPORTED
1453extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1454 PNGARG((png_structp png_ptr));
1455#endif
1456
1457#ifdef PNG_WRITE_SUPPORTED
1458extern PNG_EXPORT(void,png_set_compression_buffer_size)
1459 PNGARG((png_structp png_ptr, png_uint_32 size));
1460#endif
1461
1462/* Reset the compression stream */
1463extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1464
1465/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1466#ifdef PNG_USER_MEM_SUPPORTED
1467extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1468 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1469 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1470 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1471extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1472 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1473 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1474 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1475#endif
1476
1477/* Write a PNG chunk - size, type, (optional) data, CRC. */
1478extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1479 png_bytep chunk_name, png_bytep data, png_size_t length));
1480
1481/* Write the start of a PNG chunk - length and chunk name. */
1482extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1483 png_bytep chunk_name, png_uint_32 length));
1484
1485/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1486extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1487 png_bytep data, png_size_t length));
1488
1489/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1490extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1491
1492/* Allocate and initialize the info structure */
1493extern PNG_EXPORT(png_infop,png_create_info_struct)
1494 PNGARG((png_structp png_ptr));
1495
1496#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1497/* Initialize the info structure (old interface - DEPRECATED) */
1498extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1499#undef png_info_init
1500#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1501 png_sizeof(png_info));
1502#endif
1503
1504extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1505 png_size_t png_info_struct_size));
1506
1507/* Writes all the PNG information before the image. */
1508extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1509 png_infop info_ptr));
1510extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1511 png_infop info_ptr));
1512
1513#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1514/* read the information before the actual image data. */
1515extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1516 png_infop info_ptr));
1517#endif
1518
1519#if defined(PNG_TIME_RFC1123_SUPPORTED)
1520extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1521 PNGARG((png_structp png_ptr, png_timep ptime));
1522#endif
1523
1524#if !defined(_WIN32_WCE)
1525/* "time.h" functions are not supported on WindowsCE */
1526#if defined(PNG_WRITE_tIME_SUPPORTED)
1527/* convert from a struct tm to png_time */
1528extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1529 struct tm FAR * ttime));
1530
1531/* convert from time_t to png_time. Uses gmtime() */
1532extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1533 time_t ttime));
1534#endif /* PNG_WRITE_tIME_SUPPORTED */
1535#endif /* _WIN32_WCE */
1536
1537#if defined(PNG_READ_EXPAND_SUPPORTED)
1538/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1539extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1540#if !defined(PNG_1_0_X)
1541extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1542 png_ptr));
1543#endif
1544extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1545extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1546#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1547/* Deprecated */
1548extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1549#endif
1550#endif
1551
1552#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1553/* Use blue, green, red order for pixels. */
1554extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1555#endif
1556
1557#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1558/* Expand the grayscale to 24-bit RGB if necessary. */
1559extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1560#endif
1561
1562#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1563/* Reduce RGB to grayscale. */
1564#ifdef PNG_FLOATING_POINT_SUPPORTED
1565extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1566 int error_action, double red, double green ));
1567#endif
1568extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1569 int error_action, png_fixed_point red, png_fixed_point green ));
1570extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1571 png_ptr));
1572#endif
1573
1574extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1575 png_colorp palette));
1576
1577#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1578extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1579#endif
1580
1581#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1582 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1583extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1584#endif
1585
1586#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1587 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1588extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1589#endif
1590
1591#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1592/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1593extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1594 png_uint_32 filler, int flags));
1595/* The values of the PNG_FILLER_ defines should NOT be changed */
1596#define PNG_FILLER_BEFORE 0
1597#define PNG_FILLER_AFTER 1
1598/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1599#if !defined(PNG_1_0_X)
1600extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1601 png_uint_32 filler, int flags));
1602#endif
1603#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1604
1605#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1606/* Swap bytes in 16-bit depth files. */
1607extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1608#endif
1609
1610#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1611/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1612extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1613#endif
1614
1615#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1616/* Swap packing order of pixels in bytes. */
1617extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1618#endif
1619
1620#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1621/* Converts files to legal bit depths. */
1622extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1623 png_color_8p true_bits));
1624#endif
1625
1626#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1627 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1628/* Have the code handle the interlacing. Returns the number of passes. */
1629extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1630#endif
1631
1632#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1633/* Invert monochrome files */
1634extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1635#endif
1636
1637#if defined(PNG_READ_BACKGROUND_SUPPORTED)
1638/* Handle alpha and tRNS by replacing with a background color. */
1639#ifdef PNG_FLOATING_POINT_SUPPORTED
1640extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1641 png_color_16p background_color, int background_gamma_code,
1642 int need_expand, double background_gamma));
1643#endif
1644#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1645#define PNG_BACKGROUND_GAMMA_SCREEN 1
1646#define PNG_BACKGROUND_GAMMA_FILE 2
1647#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1648#endif
1649
1650#if defined(PNG_READ_16_TO_8_SUPPORTED)
1651/* strip the second byte of information from a 16-bit depth file. */
1652extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1653#endif
1654
1655#if defined(PNG_READ_DITHER_SUPPORTED)
1656/* Turn on dithering, and reduce the palette to the number of colors available. */
1657extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1658 png_colorp palette, int num_palette, int maximum_colors,
1659 png_uint_16p histogram, int full_dither));
1660#endif
1661
1662#if defined(PNG_READ_GAMMA_SUPPORTED)
1663/* Handle gamma correction. Screen_gamma=(display_exponent) */
1664#ifdef PNG_FLOATING_POINT_SUPPORTED
1665extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1666 double screen_gamma, double default_file_gamma));
1667#endif
1668#endif
1669
1670#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1671#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1672 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1673/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1674/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1675extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1676 int empty_plte_permitted));
1677#endif
1678#endif
1679
1680#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1681/* Set how many lines between output flushes - 0 for no flushing */
1682extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1683/* Flush the current PNG output buffer */
1684extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1685#endif
1686
1687/* optional update palette with requested transformations */
1688extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1689
1690/* optional call to update the users info structure */
1691extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1692 png_infop info_ptr));
1693
1694#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1695/* read one or more rows of image data. */
1696extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1697 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1698#endif
1699
1700#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1701/* read a row of data. */
1702extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1703 png_bytep row,
1704 png_bytep display_row));
1705#endif
1706
1707#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1708/* read the whole image into memory at once. */
1709extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1710 png_bytepp image));
1711#endif
1712
1713/* write a row of image data */
1714extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1715 png_bytep row));
1716
1717/* write a few rows of image data */
1718extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1719 png_bytepp row, png_uint_32 num_rows));
1720
1721/* write the image data */
1722extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1723 png_bytepp image));
1724
1725/* writes the end of the PNG file. */
1726extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1727 png_infop info_ptr));
1728
1729#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1730/* read the end of the PNG file. */
1731extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1732 png_infop info_ptr));
1733#endif
1734
1735/* free any memory associated with the png_info_struct */
1736extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1737 png_infopp info_ptr_ptr));
1738
1739/* free any memory associated with the png_struct and the png_info_structs */
1740extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1741 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1742
1743/* free all memory used by the read (old method - NOT DLL EXPORTED) */
1744extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1745 png_infop end_info_ptr));
1746
1747/* free any memory associated with the png_struct and the png_info_structs */
1748extern PNG_EXPORT(void,png_destroy_write_struct)
1749 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1750
1751/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1752extern void png_write_destroy PNGARG((png_structp png_ptr));
1753
1754/* set the libpng method of handling chunk CRC errors */
1755extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1756 int crit_action, int ancil_action));
1757
1758/* Values for png_set_crc_action() to say how to handle CRC errors in
1759 * ancillary and critical chunks, and whether to use the data contained
1760 * therein. Note that it is impossible to "discard" data in a critical
1761 * chunk. For versions prior to 0.90, the action was always error/quit,
1762 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1763 * chunks is warn/discard. These values should NOT be changed.
1764 *
1765 * value action:critical action:ancillary
1766 */
1767#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1768#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1769#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1770#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1771#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1772#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1773
1774/* These functions give the user control over the scan-line filtering in
1775 * libpng and the compression methods used by zlib. These functions are
1776 * mainly useful for testing, as the defaults should work with most users.
1777 * Those users who are tight on memory or want faster performance at the
1778 * expense of compression can modify them. See the compression library
1779 * header file (zlib.h) for an explination of the compression functions.
1780 */
1781
1782/* set the filtering method(s) used by libpng. Currently, the only valid
1783 * value for "method" is 0.
1784 */
1785extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1786 int filters));
1787
1788/* Flags for png_set_filter() to say which filters to use. The flags
1789 * are chosen so that they don't conflict with real filter types
1790 * below, in case they are supplied instead of the #defined constants.
1791 * These values should NOT be changed.
1792 */
1793#define PNG_NO_FILTERS 0x00
1794#define PNG_FILTER_NONE 0x08
1795#define PNG_FILTER_SUB 0x10
1796#define PNG_FILTER_UP 0x20
1797#define PNG_FILTER_AVG 0x40
1798#define PNG_FILTER_PAETH 0x80
1799#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1800 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1801
1802/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1803 * These defines should NOT be changed.
1804 */
1805#define PNG_FILTER_VALUE_NONE 0
1806#define PNG_FILTER_VALUE_SUB 1
1807#define PNG_FILTER_VALUE_UP 2
1808#define PNG_FILTER_VALUE_AVG 3
1809#define PNG_FILTER_VALUE_PAETH 4
1810#define PNG_FILTER_VALUE_LAST 5
1811
1812#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1813/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1814 * defines, either the default (minimum-sum-of-absolute-differences), or
1815 * the experimental method (weighted-minimum-sum-of-absolute-differences).
1816 *
1817 * Weights are factors >= 1.0, indicating how important it is to keep the
1818 * filter type consistent between rows. Larger numbers mean the current
1819 * filter is that many times as likely to be the same as the "num_weights"
1820 * previous filters. This is cumulative for each previous row with a weight.
1821 * There needs to be "num_weights" values in "filter_weights", or it can be
1822 * NULL if the weights aren't being specified. Weights have no influence on
1823 * the selection of the first row filter. Well chosen weights can (in theory)
1824 * improve the compression for a given image.
1825 *
1826 * Costs are factors >= 1.0 indicating the relative decoding costs of a
1827 * filter type. Higher costs indicate more decoding expense, and are
1828 * therefore less likely to be selected over a filter with lower computational
1829 * costs. There needs to be a value in "filter_costs" for each valid filter
1830 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1831 * setting the costs. Costs try to improve the speed of decompression without
1832 * unduly increasing the compressed image size.
1833 *
1834 * A negative weight or cost indicates the default value is to be used, and
1835 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1836 * The default values for both weights and costs are currently 1.0, but may
1837 * change if good general weighting/cost heuristics can be found. If both
1838 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1839 * to the UNWEIGHTED method, but with added encoding time/computation.
1840 */
1841#ifdef PNG_FLOATING_POINT_SUPPORTED
1842extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1843 int heuristic_method, int num_weights, png_doublep filter_weights,
1844 png_doublep filter_costs));
1845#endif
1846#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1847
1848/* Heuristic used for row filter selection. These defines should NOT be
1849 * changed.
1850 */
1851#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1852#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1853#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1854#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1855
1856/* Set the library compression level. Currently, valid values range from
1857 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1858 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1859 * shown that zlib compression levels 3-6 usually perform as well as level 9
1860 * for PNG images, and do considerably fewer caclulations. In the future,
1861 * these values may not correspond directly to the zlib compression levels.
1862 */
1863extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1864 int level));
1865
1866extern PNG_EXPORT(void,png_set_compression_mem_level)
1867 PNGARG((png_structp png_ptr, int mem_level));
1868
1869extern PNG_EXPORT(void,png_set_compression_strategy)
1870 PNGARG((png_structp png_ptr, int strategy));
1871
1872extern PNG_EXPORT(void,png_set_compression_window_bits)
1873 PNGARG((png_structp png_ptr, int window_bits));
1874
1875extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1876 int method));
1877
1878/* These next functions are called for input/output, memory, and error
1879 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1880 * and call standard C I/O routines such as fread(), fwrite(), and
1881 * fprintf(). These functions can be made to use other I/O routines
1882 * at run time for those applications that need to handle I/O in a
1883 * different manner by calling png_set_???_fn(). See libpng.txt for
1884 * more information.
1885 */
1886
1887#if !defined(PNG_NO_STDIO)
1888/* Initialize the input/output for the PNG file to the default functions. */
1889extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1890#endif
1891
1892/* Replace the (error and abort), and warning functions with user
1893 * supplied functions. If no messages are to be printed you must still
1894 * write and use replacement functions. The replacement error_fn should
1895 * still do a longjmp to the last setjmp location if you are using this
1896 * method of error handling. If error_fn or warning_fn is NULL, the
1897 * default function will be used.
1898 */
1899
1900extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1901 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1902
1903/* Return the user pointer associated with the error functions */
1904extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1905
1906/* Replace the default data output functions with a user supplied one(s).
1907 * If buffered output is not used, then output_flush_fn can be set to NULL.
1908 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1909 * output_flush_fn will be ignored (and thus can be NULL).
1910 */
1911extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1912 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1913
1914/* Replace the default data input function with a user supplied one. */
1915extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1916 png_voidp io_ptr, png_rw_ptr read_data_fn));
1917
1918/* Return the user pointer associated with the I/O functions */
1919extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1920
1921extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1922 png_read_status_ptr read_row_fn));
1923
1924extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1925 png_write_status_ptr write_row_fn));
1926
1927#ifdef PNG_USER_MEM_SUPPORTED
1928/* Replace the default memory allocation functions with user supplied one(s). */
1929extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1930 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1931/* Return the user pointer associated with the memory functions */
1932extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
1933#endif
1934
1935#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1936 defined(PNG_LEGACY_SUPPORTED)
1937extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
1938 png_ptr, png_user_transform_ptr read_user_transform_fn));
1939#endif
1940
1941#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1942 defined(PNG_LEGACY_SUPPORTED)
1943extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
1944 png_ptr, png_user_transform_ptr write_user_transform_fn));
1945#endif
1946
1947#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1948 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1949 defined(PNG_LEGACY_SUPPORTED)
1950extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
1951 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
1952 int user_transform_channels));
1953/* Return the user pointer associated with the user transform functions */
1954extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
1955 PNGARG((png_structp png_ptr));
1956#endif
1957
1958#ifdef PNG_USER_CHUNKS_SUPPORTED
1959extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
1960 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
1961extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
1962 png_ptr));
1963#endif
1964
1965#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1966/* Sets the function callbacks for the push reader, and a pointer to a
1967 * user-defined structure available to the callback functions.
1968 */
1969extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
1970 png_voidp progressive_ptr,
1971 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1972 png_progressive_end_ptr end_fn));
1973
1974/* returns the user pointer associated with the push read functions */
1975extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
1976 PNGARG((png_structp png_ptr));
1977
1978/* function to be called when data becomes available */
1979extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
1980 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
1981
1982/* function that combines rows. Not very much different than the
1983 * png_combine_row() call. Is this even used?????
1984 */
1985extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
1986 png_bytep old_row, png_bytep new_row));
1987#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1988
1989extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
1990 png_uint_32 size));
1991
1992#if defined(PNG_1_0_X)
1993# define png_malloc_warn png_malloc
1994#else
1995/* Added at libpng version 1.2.4 */
1996extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
1997 png_uint_32 size));
1998#endif
1999
2000/* frees a pointer allocated by png_malloc() */
2001extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2002
2003#if defined(PNG_1_0_X)
2004/* Function to allocate memory for zlib. */
2005extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2006 uInt size));
2007
2008/* Function to free memory for zlib */
2009extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2010#endif
2011
2012/* Free data that was allocated internally */
2013extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2014 png_infop info_ptr, png_uint_32 free_me, int num));
2015#ifdef PNG_FREE_ME_SUPPORTED
2016/* Reassign responsibility for freeing existing data, whether allocated
2017 * by libpng or by the application */
2018extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2019 png_infop info_ptr, int freer, png_uint_32 mask));
2020#endif
2021/* assignments for png_data_freer */
2022#define PNG_DESTROY_WILL_FREE_DATA 1
2023#define PNG_SET_WILL_FREE_DATA 1
2024#define PNG_USER_WILL_FREE_DATA 2
2025/* Flags for png_ptr->free_me and info_ptr->free_me */
2026#define PNG_FREE_HIST 0x0008
2027#define PNG_FREE_ICCP 0x0010
2028#define PNG_FREE_SPLT 0x0020
2029#define PNG_FREE_ROWS 0x0040
2030#define PNG_FREE_PCAL 0x0080
2031#define PNG_FREE_SCAL 0x0100
2032#define PNG_FREE_UNKN 0x0200
2033#define PNG_FREE_LIST 0x0400
2034#define PNG_FREE_PLTE 0x1000
2035#define PNG_FREE_TRNS 0x2000
2036#define PNG_FREE_TEXT 0x4000
2037#define PNG_FREE_ALL 0x7fff
2038#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2039
2040#ifdef PNG_USER_MEM_SUPPORTED
2041extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2042 png_uint_32 size));
2043extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2044 png_voidp ptr));
2045#endif
2046
2047extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2048 png_voidp s1, png_voidp s2, png_uint_32 size));
2049
2050extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2051 png_voidp s1, int value, png_uint_32 size));
2052
2053#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2054extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2055 int check));
2056#endif /* USE_FAR_KEYWORD */
2057
2058/* Fatal error in PNG image of libpng - can't continue */
2059extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2060 png_const_charp error_message));
2061
2062/* The same, but the chunk name is prepended to the error string. */
2063extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2064 png_const_charp error_message));
2065
2066/* Non-fatal error in libpng. Can continue, but may have a problem. */
2067extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2068 png_const_charp warning_message));
2069
2070/* Non-fatal error in libpng, chunk name is prepended to message. */
2071extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2072 png_const_charp warning_message));
2073
2074/* The png_set_<chunk> functions are for storing values in the png_info_struct.
2075 * Similarly, the png_get_<chunk> calls are used to read values from the
2076 * png_info_struct, either storing the parameters in the passed variables, or
2077 * setting pointers into the png_info_struct where the data is stored. The
2078 * png_get_<chunk> functions return a non-zero value if the data was available
2079 * in info_ptr, or return zero and do not change any of the parameters if the
2080 * data was not available.
2081 *
2082 * These functions should be used instead of directly accessing png_info
2083 * to avoid problems with future changes in the size and internal layout of
2084 * png_info_struct.
2085 */
2086/* Returns "flag" if chunk data is valid in info_ptr. */
2087extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2088png_infop info_ptr, png_uint_32 flag));
2089
2090/* Returns number of bytes needed to hold a transformed row. */
2091extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2092png_infop info_ptr));
2093
2094#if defined(PNG_INFO_IMAGE_SUPPORTED)
2095/* Returns row_pointers, which is an array of pointers to scanlines that was
2096returned from png_read_png(). */
2097extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2098png_infop info_ptr));
2099/* Set row_pointers, which is an array of pointers to scanlines for use
2100by png_write_png(). */
2101extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2102 png_infop info_ptr, png_bytepp row_pointers));
2103#endif
2104
2105/* Returns number of color channels in image. */
2106extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2107png_infop info_ptr));
2108
2109#ifdef PNG_EASY_ACCESS_SUPPORTED
2110/* Returns image width in pixels. */
2111extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2112png_ptr, png_infop info_ptr));
2113
2114/* Returns image height in pixels. */
2115extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2116png_ptr, png_infop info_ptr));
2117
2118/* Returns image bit_depth. */
2119extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2120png_ptr, png_infop info_ptr));
2121
2122/* Returns image color_type. */
2123extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2124png_ptr, png_infop info_ptr));
2125
2126/* Returns image filter_type. */
2127extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2128png_ptr, png_infop info_ptr));
2129
2130/* Returns image interlace_type. */
2131extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2132png_ptr, png_infop info_ptr));
2133
2134/* Returns image compression_type. */
2135extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2136png_ptr, png_infop info_ptr));
2137
2138/* Returns image resolution in pixels per meter, from pHYs chunk data. */
2139extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2140png_ptr, png_infop info_ptr));
2141extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2142png_ptr, png_infop info_ptr));
2143extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2144png_ptr, png_infop info_ptr));
2145
2146/* Returns pixel aspect ratio, computed from pHYs chunk data. */
2147#ifdef PNG_FLOATING_POINT_SUPPORTED
2148extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2149png_ptr, png_infop info_ptr));
2150#endif
2151
2152/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2153extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2154png_ptr, png_infop info_ptr));
2155extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2156png_ptr, png_infop info_ptr));
2157extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2158png_ptr, png_infop info_ptr));
2159extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2160png_ptr, png_infop info_ptr));
2161
2162#endif /* PNG_EASY_ACCESS_SUPPORTED */
2163
2164/* Returns pointer to signature string read from PNG header */
2165extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2166png_infop info_ptr));
2167
2168#if defined(PNG_bKGD_SUPPORTED)
2169extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2170 png_infop info_ptr, png_color_16p *background));
2171#endif
2172
2173#if defined(PNG_bKGD_SUPPORTED)
2174extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2175 png_infop info_ptr, png_color_16p background));
2176#endif
2177
2178#if defined(PNG_cHRM_SUPPORTED)
2179#ifdef PNG_FLOATING_POINT_SUPPORTED
2180extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2181 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2182 double *red_y, double *green_x, double *green_y, double *blue_x,
2183 double *blue_y));
2184#endif
2185#ifdef PNG_FIXED_POINT_SUPPORTED
2186extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2187 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2188 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2189 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2190 *int_blue_x, png_fixed_point *int_blue_y));
2191#endif
2192#endif
2193
2194#if defined(PNG_cHRM_SUPPORTED)
2195#ifdef PNG_FLOATING_POINT_SUPPORTED
2196extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2197 png_infop info_ptr, double white_x, double white_y, double red_x,
2198 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2199#endif
2200#ifdef PNG_FIXED_POINT_SUPPORTED
2201extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2202 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2203 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2204 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2205 png_fixed_point int_blue_y));
2206#endif
2207#endif
2208
2209#if defined(PNG_gAMA_SUPPORTED)
2210#ifdef PNG_FLOATING_POINT_SUPPORTED
2211extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2212 png_infop info_ptr, double *file_gamma));
2213#endif
2214extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2215 png_infop info_ptr, png_fixed_point *int_file_gamma));
2216#endif
2217
2218#if defined(PNG_gAMA_SUPPORTED)
2219#ifdef PNG_FLOATING_POINT_SUPPORTED
2220extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2221 png_infop info_ptr, double file_gamma));
2222#endif
2223extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2224 png_infop info_ptr, png_fixed_point int_file_gamma));
2225#endif
2226
2227#if defined(PNG_hIST_SUPPORTED)
2228extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2229 png_infop info_ptr, png_uint_16p *hist));
2230#endif
2231
2232#if defined(PNG_hIST_SUPPORTED)
2233extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2234 png_infop info_ptr, png_uint_16p hist));
2235#endif
2236
2237extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2238 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2239 int *bit_depth, int *color_type, int *interlace_method,
2240 int *compression_method, int *filter_method));
2241
2242extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2243 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2244 int color_type, int interlace_method, int compression_method,
2245 int filter_method));
2246
2247#if defined(PNG_oFFs_SUPPORTED)
2248extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2249 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2250 int *unit_type));
2251#endif
2252
2253#if defined(PNG_oFFs_SUPPORTED)
2254extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2255 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2256 int unit_type));
2257#endif
2258
2259#if defined(PNG_pCAL_SUPPORTED)
2260extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2261 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2262 int *type, int *nparams, png_charp *units, png_charpp *params));
2263#endif
2264
2265#if defined(PNG_pCAL_SUPPORTED)
2266extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2267 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2268 int type, int nparams, png_charp units, png_charpp params));
2269#endif
2270
2271#if defined(PNG_pHYs_SUPPORTED)
2272extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2273 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2274#endif
2275
2276#if defined(PNG_pHYs_SUPPORTED)
2277extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2278 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2279#endif
2280
2281extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2282 png_infop info_ptr, png_colorp *palette, int *num_palette));
2283
2284extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2285 png_infop info_ptr, png_colorp palette, int num_palette));
2286
2287#if defined(PNG_sBIT_SUPPORTED)
2288extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2289 png_infop info_ptr, png_color_8p *sig_bit));
2290#endif
2291
2292#if defined(PNG_sBIT_SUPPORTED)
2293extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2294 png_infop info_ptr, png_color_8p sig_bit));
2295#endif
2296
2297#if defined(PNG_sRGB_SUPPORTED)
2298extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2299 png_infop info_ptr, int *intent));
2300#endif
2301
2302#if defined(PNG_sRGB_SUPPORTED)
2303extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2304 png_infop info_ptr, int intent));
2305extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2306 png_infop info_ptr, int intent));
2307#endif
2308
2309#if defined(PNG_iCCP_SUPPORTED)
2310extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2311 png_infop info_ptr, png_charpp name, int *compression_type,
2312 png_charpp profile, png_uint_32 *proflen));
2313 /* Note to maintainer: profile should be png_bytepp */
2314#endif
2315
2316#if defined(PNG_iCCP_SUPPORTED)
2317extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2318 png_infop info_ptr, png_charp name, int compression_type,
2319 png_charp profile, png_uint_32 proflen));
2320 /* Note to maintainer: profile should be png_bytep */
2321#endif
2322
2323#if defined(PNG_sPLT_SUPPORTED)
2324extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2325 png_infop info_ptr, png_sPLT_tpp entries));
2326#endif
2327
2328#if defined(PNG_sPLT_SUPPORTED)
2329extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2330 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2331#endif
2332
2333#if defined(PNG_TEXT_SUPPORTED)
2334/* png_get_text also returns the number of text chunks in *num_text */
2335extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2336 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2337#endif
2338
2339/*
2340 * Note while png_set_text() will accept a structure whose text,
2341 * language, and translated keywords are NULL pointers, the structure
2342 * returned by png_get_text will always contain regular
2343 * zero-terminated C strings. They might be empty strings but
2344 * they will never be NULL pointers.
2345 */
2346
2347#if defined(PNG_TEXT_SUPPORTED)
2348extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2349 png_infop info_ptr, png_textp text_ptr, int num_text));
2350#endif
2351
2352#if defined(PNG_tIME_SUPPORTED)
2353extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2354 png_infop info_ptr, png_timep *mod_time));
2355#endif
2356
2357#if defined(PNG_tIME_SUPPORTED)
2358extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2359 png_infop info_ptr, png_timep mod_time));
2360#endif
2361
2362#if defined(PNG_tRNS_SUPPORTED)
2363extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2364 png_infop info_ptr, png_bytep *trans, int *num_trans,
2365 png_color_16p *trans_values));
2366#endif
2367
2368#if defined(PNG_tRNS_SUPPORTED)
2369extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2370 png_infop info_ptr, png_bytep trans, int num_trans,
2371 png_color_16p trans_values));
2372#endif
2373
2374#if defined(PNG_tRNS_SUPPORTED)
2375#endif
2376
2377#if defined(PNG_sCAL_SUPPORTED)
2378#ifdef PNG_FLOATING_POINT_SUPPORTED
2379extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2380 png_infop info_ptr, int *unit, double *width, double *height));
2381#else
2382#ifdef PNG_FIXED_POINT_SUPPORTED
2383extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2384 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2385#endif
2386#endif
2387#endif /* PNG_sCAL_SUPPORTED */
2388
2389#if defined(PNG_sCAL_SUPPORTED)
2390#ifdef PNG_FLOATING_POINT_SUPPORTED
2391extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2392 png_infop info_ptr, int unit, double width, double height));
2393#else
2394#ifdef PNG_FIXED_POINT_SUPPORTED
2395extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2396 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2397#endif
2398#endif
2399#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2400
2401#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2402/* provide a list of chunks and how they are to be handled, if the built-in
2403 handling or default unknown chunk handling is not desired. Any chunks not
2404 listed will be handled in the default manner. The IHDR and IEND chunks
2405 must not be listed.
2406 keep = 0: follow default behaviour
2407 = 1: do not keep
2408 = 2: keep only if safe-to-copy
2409 = 3: keep even if unsafe-to-copy
2410*/
2411extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2412 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2413extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2414 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2415extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2416 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2417extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2418 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2419#endif
2420#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2421PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2422 chunk_name));
2423#endif
2424
2425/* Png_free_data() will turn off the "valid" flag for anything it frees.
2426 If you need to turn it off for a chunk that your application has freed,
2427 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2428extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2429 png_infop info_ptr, int mask));
2430
2431#if defined(PNG_INFO_IMAGE_SUPPORTED)
2432/* The "params" pointer is currently not used and is for future expansion. */
2433extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2434 png_infop info_ptr,
2435 int transforms,
2436 png_voidp params));
2437extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2438 png_infop info_ptr,
2439 int transforms,
2440 png_voidp params));
2441#endif
2442
2443/* Define PNG_DEBUG at compile time for debugging information. Higher
2444 * numbers for PNG_DEBUG mean more debugging information. This has
2445 * only been added since version 0.95 so it is not implemented throughout
2446 * libpng yet, but more support will be added as needed.
2447 */
2448#ifdef PNG_DEBUG
2449#if (PNG_DEBUG > 0)
2450#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2451#include <crtdbg.h>
2452#if (PNG_DEBUG > 1)
2453#define png_debug(l,m) _RPT0(_CRT_WARN,m)
2454#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2455#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2456#endif
2457#else /* PNG_DEBUG_FILE || !_MSC_VER */
2458#ifndef PNG_DEBUG_FILE
2459#define PNG_DEBUG_FILE stderr
2460#endif /* PNG_DEBUG_FILE */
2461#if (PNG_DEBUG > 1)
2462#define png_debug(l,m) \
2463{ \
2464 int num_tabs=l; \
2465 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2466 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2467}
2468#define png_debug1(l,m,p1) \
2469{ \
2470 int num_tabs=l; \
2471 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2472 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2473}
2474#define png_debug2(l,m,p1,p2) \
2475{ \
2476 int num_tabs=l; \
2477 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2478 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2479}
2480#endif /* (PNG_DEBUG > 1) */
2481#endif /* _MSC_VER */
2482#endif /* (PNG_DEBUG > 0) */
2483#endif /* PNG_DEBUG */
2484#ifndef png_debug
2485#define png_debug(l, m)
2486#endif
2487#ifndef png_debug1
2488#define png_debug1(l, m, p1)
2489#endif
2490#ifndef png_debug2
2491#define png_debug2(l, m, p1, p2)
2492#endif
2493
2494#if 0
2495extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
2496#endif
2497
2498extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2499extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2500extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2501extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2502
2503#ifdef PNG_MNG_FEATURES_SUPPORTED
2504extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2505 png_ptr, png_uint_32 mng_features_permitted));
2506#endif
2507
2508/* For use in png_set_keep_unknown, added to version 1.2.6 */
2509#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2510#define PNG_HANDLE_CHUNK_NEVER 1
2511#define PNG_HANDLE_CHUNK_IF_SAFE 2
2512#define PNG_HANDLE_CHUNK_ALWAYS 3
2513
2514/* Added to version 1.2.0 */
2515#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2516#if defined(PNG_MMX_CODE_SUPPORTED)
2517#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2518#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2519#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2520#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2521#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2522#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2523#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2524#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2525#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2526
2527#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2528 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2529 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2530 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2531 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2532 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2533#define PNG_MMX_WRITE_FLAGS ( 0 )
2534
2535#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2536 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2537 | PNG_MMX_READ_FLAGS \
2538 | PNG_MMX_WRITE_FLAGS )
2539
2540#define PNG_SELECT_READ 1
2541#define PNG_SELECT_WRITE 2
2542#endif /* PNG_MMX_CODE_SUPPORTED */
2543
2544#if !defined(PNG_1_0_X)
2545/* pngget.c */
2546extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2547 PNGARG((int flag_select, int *compilerID));
2548
2549/* pngget.c */
2550extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2551 PNGARG((int flag_select));
2552
2553/* pngget.c */
2554extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2555 PNGARG((png_structp png_ptr));
2556
2557/* pngget.c */
2558extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2559 PNGARG((png_structp png_ptr));
2560
2561/* pngget.c */
2562extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2563 PNGARG((png_structp png_ptr));
2564
2565/* pngset.c */
2566extern PNG_EXPORT(void,png_set_asm_flags)
2567 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2568
2569/* pngset.c */
2570extern PNG_EXPORT(void,png_set_mmx_thresholds)
2571 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2572 png_uint_32 mmx_rowbytes_threshold));
2573
2574#endif /* PNG_1_0_X */
2575
2576#if !defined(PNG_1_0_X)
2577/* png.c, pnggccrd.c, or pngvcrd.c */
2578extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2579#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2580
2581/* Strip the prepended error numbers ("#nnn ") from error and warning
2582 * messages before passing them to the error or warning handler. */
2583#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2584extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2585 png_ptr, png_uint_32 strip_mode));
2586#endif
2587
2588#endif /* PNG_1_0_X */
2589
2590/* Added at libpng-1.2.6 */
2591#ifdef PNG_SET_USER_LIMITS_SUPPORTED
2592extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2593 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2594extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2595 png_ptr));
2596extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2597 png_ptr));
2598#endif
2599
2600/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2601
2602#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2603/* With these routines we avoid an integer divide, which will be slower on
2604 * most machines. However, it does take more operations than the corresponding
2605 * divide method, so it may be slower on a few RISC systems. There are two
2606 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2607 *
2608 * Note that the rounding factors are NOT supposed to be the same! 128 and
2609 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2610 * standard method.
2611 *
2612 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2613 */
2614
2615 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2616
2617# define png_composite(composite, fg, alpha, bg) \
2618 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2619 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2620 (png_uint_16)(alpha)) + (png_uint_16)128); \
2621 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2622
2623# define png_composite_16(composite, fg, alpha, bg) \
2624 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2625 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2626 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2627 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2628
2629#else /* standard method using integer division */
2630
2631# define png_composite(composite, fg, alpha, bg) \
2632 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2633 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2634 (png_uint_16)127) / 255)
2635
2636# define png_composite_16(composite, fg, alpha, bg) \
2637 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2638 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2639 (png_uint_32)32767) / (png_uint_32)65535L)
2640
2641#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2642
2643/* Inline macros to do direct reads of bytes from the input buffer. These
2644 * require that you are using an architecture that uses PNG byte ordering
2645 * (MSB first) and supports unaligned data storage. I think that PowerPC
2646 * in big-endian mode and 680x0 are the only ones that will support this.
2647 * The x86 line of processors definitely do not. The png_get_int_32()
2648 * routine also assumes we are using two's complement format for negative
2649 * values, which is almost certainly true.
2650 */
2651#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2652# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2653# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2654# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2655#else
2656extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2657extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2658extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2659#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2660extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2661 PNGARG((png_structp png_ptr, png_bytep buf));
2662/* No png_get_int_16 -- may be added if there's a real need for it. */
2663
2664/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2665 */
2666extern PNG_EXPORT(void,png_save_uint_32)
2667 PNGARG((png_bytep buf, png_uint_32 i));
2668extern PNG_EXPORT(void,png_save_int_32)
2669 PNGARG((png_bytep buf, png_int_32 i));
2670
2671/* Place a 16-bit number into a buffer in PNG byte order.
2672 * The parameter is declared unsigned int, not png_uint_16,
2673 * just to avoid potential problems on pre-ANSI C compilers.
2674 */
2675extern PNG_EXPORT(void,png_save_uint_16)
2676 PNGARG((png_bytep buf, unsigned int i));
2677/* No png_save_int_16 -- may be added if there's a real need for it. */
2678
2679/* ************************************************************************* */
2680
2681/* These next functions are used internally in the code. They generally
2682 * shouldn't be used unless you are writing code to add or replace some
2683 * functionality in libpng. More information about most functions can
2684 * be found in the files where the functions are located.
2685 */
2686
2687
2688/* Various modes of operation, that are visible to applications because
2689 * they are used for unknown chunk location.
2690 */
2691#define PNG_HAVE_IHDR 0x01
2692#define PNG_HAVE_PLTE 0x02
2693#define PNG_HAVE_IDAT 0x04
2694#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2695#define PNG_HAVE_IEND 0x10
2696
2697#if defined(PNG_INTERNAL)
2698
2699/* More modes of operation. Note that after an init, mode is set to
2700 * zero automatically when the structure is created.
2701 */
2702#define PNG_HAVE_gAMA 0x20
2703#define PNG_HAVE_cHRM 0x40
2704#define PNG_HAVE_sRGB 0x80
2705#define PNG_HAVE_CHUNK_HEADER 0x100
2706#define PNG_WROTE_tIME 0x200
2707#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2708#define PNG_BACKGROUND_IS_GRAY 0x800
2709#define PNG_HAVE_PNG_SIGNATURE 0x1000
2710#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2711
2712/* flags for the transformations the PNG library does on the image data */
2713#define PNG_BGR 0x0001
2714#define PNG_INTERLACE 0x0002
2715#define PNG_PACK 0x0004
2716#define PNG_SHIFT 0x0008
2717#define PNG_SWAP_BYTES 0x0010
2718#define PNG_INVERT_MONO 0x0020
2719#define PNG_DITHER 0x0040
2720#define PNG_BACKGROUND 0x0080
2721#define PNG_BACKGROUND_EXPAND 0x0100
2722 /* 0x0200 unused */
2723#define PNG_16_TO_8 0x0400
2724#define PNG_RGBA 0x0800
2725#define PNG_EXPAND 0x1000
2726#define PNG_GAMMA 0x2000
2727#define PNG_GRAY_TO_RGB 0x4000
2728#define PNG_FILLER 0x8000L
2729#define PNG_PACKSWAP 0x10000L
2730#define PNG_SWAP_ALPHA 0x20000L
2731#define PNG_STRIP_ALPHA 0x40000L
2732#define PNG_INVERT_ALPHA 0x80000L
2733#define PNG_USER_TRANSFORM 0x100000L
2734#define PNG_RGB_TO_GRAY_ERR 0x200000L
2735#define PNG_RGB_TO_GRAY_WARN 0x400000L
2736#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2737 /* 0x800000L Unused */
2738#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2739#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2740 /* 0x4000000L unused */
2741 /* 0x8000000L unused */
2742 /* 0x10000000L unused */
2743 /* 0x20000000L unused */
2744 /* 0x40000000L unused */
2745
2746/* flags for png_create_struct */
2747#define PNG_STRUCT_PNG 0x0001
2748#define PNG_STRUCT_INFO 0x0002
2749
2750/* Scaling factor for filter heuristic weighting calculations */
2751#define PNG_WEIGHT_SHIFT 8
2752#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2753#define PNG_COST_SHIFT 3
2754#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2755
2756/* flags for the png_ptr->flags rather than declaring a byte for each one */
2757#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2758#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2759#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2760#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2761#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2762#define PNG_FLAG_ZLIB_FINISHED 0x0020
2763#define PNG_FLAG_ROW_INIT 0x0040
2764#define PNG_FLAG_FILLER_AFTER 0x0080
2765#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2766#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2767#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2768#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2769#define PNG_FLAG_FREE_PLTE 0x1000
2770#define PNG_FLAG_FREE_TRNS 0x2000
2771#define PNG_FLAG_FREE_HIST 0x4000
2772#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2773#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2774#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2775#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2776#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2777#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2778#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2779#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2780 /* 0x800000L unused */
2781 /* 0x1000000L unused */
2782 /* 0x2000000L unused */
2783 /* 0x4000000L unused */
2784 /* 0x8000000L unused */
2785 /* 0x10000000L unused */
2786 /* 0x20000000L unused */
2787 /* 0x40000000L unused */
2788
2789#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2790 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2791
2792#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2793 PNG_FLAG_CRC_CRITICAL_IGNORE)
2794
2795#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2796 PNG_FLAG_CRC_CRITICAL_MASK)
2797
2798/* save typing and make code easier to understand */
2799
2800#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2801 abs((int)((c1).green) - (int)((c2).green)) + \
2802 abs((int)((c1).blue) - (int)((c2).blue)))
2803
2804/* Added to libpng-1.2.6 JB */
2805#define PNG_ROWBYTES(pixel_bits, width) \
2806 ((pixel_bits) >= 8 ? \
2807 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2808 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2809
2810/* PNG_OUT_OF_RANGE returns true if value is outside the range
2811 ideal-delta..ideal+delta. Each argument is evaluated twice.
2812 "ideal" and "delta" should be constants, normally simple
2813 integers, "value" a variable. Added to libpng-1.2.6 JB */
2814#define PNG_OUT_OF_RANGE(value, ideal, delta) \
2815 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2816
2817/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2818#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2819/* place to hold the signature string for a PNG file. */
2820#ifdef PNG_USE_GLOBAL_ARRAYS
2821 PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8];
2822#else
2823#if 0
2824#define png_sig png_sig_bytes(NULL)
2825#endif
2826#endif
2827#endif /* PNG_NO_EXTERN */
2828
2829/* Constant strings for known chunk types. If you need to add a chunk,
2830 * define the name here, and add an invocation of the macro in png.c and
2831 * wherever it's needed.
2832 */
2833#define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2834#define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2835#define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2836#define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2837#define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2838#define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2839#define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2840#define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2841#define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2842#define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2843#define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2844#define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2845#define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2846#define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2847#define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2848#define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2849#define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2850#define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2851#define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2852#define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2853#define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2854
2855#ifdef PNG_USE_GLOBAL_ARRAYS
2856PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5];
2857PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5];
2858PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5];
2859PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5];
2860PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5];
2861PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5];
2862PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5];
2863PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5];
2864PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5];
2865PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5];
2866PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5];
2867PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5];
2868PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5];
2869PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5];
2870PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5];
2871PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5];
2872PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5];
2873PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5];
2874PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5];
2875PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5];
2876PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
2877#endif /* PNG_USE_GLOBAL_ARRAYS */
2878
2879#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2880/* Initialize png_ptr struct for reading, and allocate any other memory.
2881 * (old interface - DEPRECATED - use png_create_read_struct instead).
2882 */
2883extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
2884#undef png_read_init
2885#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2886 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2887#endif
2888
2889extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2890 png_const_charp user_png_ver, png_size_t png_struct_size));
2891#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2892extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2893 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2894 png_info_size));
2895#endif
2896
2897#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2898/* Initialize png_ptr struct for writing, and allocate any other memory.
2899 * (old interface - DEPRECATED - use png_create_write_struct instead).
2900 */
2901extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
2902#undef png_write_init
2903#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2904 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2905#endif
2906
2907extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2908 png_const_charp user_png_ver, png_size_t png_struct_size));
2909extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2910 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2911 png_info_size));
2912
2913/* Allocate memory for an internal libpng struct */
2914PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
2915
2916/* Free memory from internal libpng struct */
2917PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
2918
2919PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2920 malloc_fn, png_voidp mem_ptr));
2921PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2922 png_free_ptr free_fn, png_voidp mem_ptr));
2923
2924/* Free any memory that info_ptr points to and reset struct. */
2925PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2926 png_infop info_ptr));
2927
2928#ifndef PNG_1_0_X
2929/* Function to allocate memory for zlib. */
2930PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
2931
2932/* Function to free memory for zlib */
2933PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
2934
2935#ifdef PNG_SIZE_T
2936/* Function to convert a sizeof an item to png_sizeof item */
2937 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
2938#endif
2939
2940/* Next four functions are used internally as callbacks. PNGAPI is required
2941 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2942
2943PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
2944 png_bytep data, png_size_t length));
2945
2946#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2947PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
2948 png_bytep buffer, png_size_t length));
2949#endif
2950
2951PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
2952 png_bytep data, png_size_t length));
2953
2954#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2955#if !defined(PNG_NO_STDIO)
2956PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
2957#endif
2958#endif
2959#else /* PNG_1_0_X */
2960#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2961PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
2962 png_bytep buffer, png_size_t length));
2963#endif
2964#endif /* PNG_1_0_X */
2965
2966/* Reset the CRC variable */
2967PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
2968
2969/* Write the "data" buffer to whatever output you are using. */
2970PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
2971 png_size_t length));
2972
2973/* Read data from whatever input you are using into the "data" buffer */
2974PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
2975 png_size_t length));
2976
2977/* Read bytes into buf, and update png_ptr->crc */
2978PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
2979 png_size_t length));
2980
2981/* Decompress data in a chunk that uses compression */
2982#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
2983 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
2984PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
2985 int comp_type, png_charp chunkdata, png_size_t chunklength,
2986 png_size_t prefix_length, png_size_t *data_length));
2987#endif
2988
2989/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
2990PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
2991
2992/* Read the CRC from the file and compare it to the libpng calculated CRC */
2993PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
2994
2995/* Calculate the CRC over a section of data. Note that we are only
2996 * passing a maximum of 64K on systems that have this as a memory limit,
2997 * since this is the maximum buffer size we can specify.
2998 */
2999PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3000 png_size_t length));
3001
3002#if defined(PNG_WRITE_FLUSH_SUPPORTED)
3003PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
3004#endif
3005
3006/* simple function to write the signature */
3007PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
3008
3009/* write various chunks */
3010
3011/* Write the IHDR chunk, and update the png_struct with the necessary
3012 * information.
3013 */
3014PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3015 png_uint_32 height,
3016 int bit_depth, int color_type, int compression_method, int filter_method,
3017 int interlace_method));
3018
3019PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3020 png_uint_32 num_pal));
3021
3022PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3023 png_size_t length));
3024
3025PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
3026
3027#if defined(PNG_WRITE_gAMA_SUPPORTED)
3028#ifdef PNG_FLOATING_POINT_SUPPORTED
3029PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
3030#endif
3031#ifdef PNG_FIXED_POINT_SUPPORTED
3032PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
3033 file_gamma));
3034#endif
3035#endif
3036
3037#if defined(PNG_WRITE_sBIT_SUPPORTED)
3038PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3039 int color_type));
3040#endif
3041
3042#if defined(PNG_WRITE_cHRM_SUPPORTED)
3043#ifdef PNG_FLOATING_POINT_SUPPORTED
3044PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3045 double white_x, double white_y,
3046 double red_x, double red_y, double green_x, double green_y,
3047 double blue_x, double blue_y));
3048#endif
3049#ifdef PNG_FIXED_POINT_SUPPORTED
3050PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3051 png_fixed_point int_white_x, png_fixed_point int_white_y,
3052 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3053 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3054 png_fixed_point int_blue_y));
3055#endif
3056#endif
3057
3058#if defined(PNG_WRITE_sRGB_SUPPORTED)
3059PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3060 int intent));
3061#endif
3062
3063#if defined(PNG_WRITE_iCCP_SUPPORTED)
3064PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3065 png_charp name, int compression_type,
3066 png_charp profile, int proflen));
3067 /* Note to maintainer: profile should be png_bytep */
3068#endif
3069
3070#if defined(PNG_WRITE_sPLT_SUPPORTED)
3071PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3072 png_sPLT_tp palette));
3073#endif
3074
3075#if defined(PNG_WRITE_tRNS_SUPPORTED)
3076PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3077 png_color_16p values, int number, int color_type));
3078#endif
3079
3080#if defined(PNG_WRITE_bKGD_SUPPORTED)
3081PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3082 png_color_16p values, int color_type));
3083#endif
3084
3085#if defined(PNG_WRITE_hIST_SUPPORTED)
3086PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3087 int num_hist));
3088#endif
3089
3090#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3091 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3092PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3093 png_charp key, png_charpp new_key));
3094#endif
3095
3096#if defined(PNG_WRITE_tEXt_SUPPORTED)
3097PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3098 png_charp text, png_size_t text_len));
3099#endif
3100
3101#if defined(PNG_WRITE_zTXt_SUPPORTED)
3102PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3103 png_charp text, png_size_t text_len, int compression));
3104#endif
3105
3106#if defined(PNG_WRITE_iTXt_SUPPORTED)
3107PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3108 int compression, png_charp key, png_charp lang, png_charp lang_key,
3109 png_charp text));
3110#endif
3111
3112#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3113PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3114 png_infop info_ptr, png_textp text_ptr, int num_text));
3115#endif
3116
3117#if defined(PNG_WRITE_oFFs_SUPPORTED)
3118PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3119 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3120#endif
3121
3122#if defined(PNG_WRITE_pCAL_SUPPORTED)
3123PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3124 png_int_32 X0, png_int_32 X1, int type, int nparams,
3125 png_charp units, png_charpp params));
3126#endif
3127
3128#if defined(PNG_WRITE_pHYs_SUPPORTED)
3129PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3130 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3131 int unit_type));
3132#endif
3133
3134#if defined(PNG_WRITE_tIME_SUPPORTED)
3135PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3136 png_timep mod_time));
3137#endif
3138
3139#if defined(PNG_WRITE_sCAL_SUPPORTED)
3140#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3141PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3142 int unit, double width, double height));
3143#else
3144#ifdef PNG_FIXED_POINT_SUPPORTED
3145PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3146 int unit, png_charp width, png_charp height));
3147#endif
3148#endif
3149#endif
3150
3151/* Called when finished processing a row of data */
3152PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3153
3154/* Internal use only. Called before first row of data */
3155PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3156
3157#if defined(PNG_READ_GAMMA_SUPPORTED)
3158PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3159#endif
3160
3161/* combine a row of data, dealing with alpha, etc. if requested */
3162PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3163 int mask));
3164
3165#if defined(PNG_READ_INTERLACING_SUPPORTED)
3166/* expand an interlaced row */
3167/* OLD pre-1.0.9 interface:
3168PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3169 png_bytep row, int pass, png_uint_32 transformations));
3170 */
3171PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3172#endif
3173
3174/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3175
3176#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3177/* grab pixels out of a row for an interlaced pass */
3178PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3179 png_bytep row, int pass));
3180#endif
3181
3182/* unfilter a row */
3183PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3184 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3185
3186/* Choose the best filter to use and filter the row data */
3187PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3188 png_row_infop row_info));
3189
3190/* Write out the filtered row. */
3191PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3192 png_bytep filtered_row));
3193/* finish a row while reading, dealing with interlacing passes, etc. */
3194PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3195
3196/* initialize the row buffers, etc. */
3197PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3198/* optional call to update the users info structure */
3199PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3200 png_infop info_ptr));
3201
3202/* these are the functions that do the transformations */
3203#if defined(PNG_READ_FILLER_SUPPORTED)
3204PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3205 png_bytep row, png_uint_32 filler, png_uint_32 flags));
3206#endif
3207
3208#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3209PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3210 png_bytep row));
3211#endif
3212
3213#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3214PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3215 png_bytep row));
3216#endif
3217
3218#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3219PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3220 png_bytep row));
3221#endif
3222
3223#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3224PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3225 png_bytep row));
3226#endif
3227
3228#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3229 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3230PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3231 png_bytep row, png_uint_32 flags));
3232#endif
3233
3234#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3235PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3236#endif
3237
3238#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3239PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3240#endif
3241
3242#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3243PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3244 row_info, png_bytep row));
3245#endif
3246
3247#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3248PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3249 png_bytep row));
3250#endif
3251
3252#if defined(PNG_READ_PACK_SUPPORTED)
3253PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3254#endif
3255
3256#if defined(PNG_READ_SHIFT_SUPPORTED)
3257PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3258 png_color_8p sig_bits));
3259#endif
3260
3261#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3262PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3263#endif
3264
3265#if defined(PNG_READ_16_TO_8_SUPPORTED)
3266PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3267#endif
3268
3269#if defined(PNG_READ_DITHER_SUPPORTED)
3270PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3271 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3272
3273# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3274PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3275 png_colorp palette, int num_palette));
3276# endif
3277#endif
3278
3279#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3280PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3281#endif
3282
3283#if defined(PNG_WRITE_PACK_SUPPORTED)
3284PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3285 png_bytep row, png_uint_32 bit_depth));
3286#endif
3287
3288#if defined(PNG_WRITE_SHIFT_SUPPORTED)
3289PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3290 png_color_8p bit_depth));
3291#endif
3292
3293#if defined(PNG_READ_BACKGROUND_SUPPORTED)
3294#if defined(PNG_READ_GAMMA_SUPPORTED)
3295PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3296 png_color_16p trans_values, png_color_16p background,
3297 png_color_16p background_1,
3298 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3299 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3300 png_uint_16pp gamma_16_to_1, int gamma_shift));
3301#else
3302PNG_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#endif
3305#endif
3306
3307#if defined(PNG_READ_GAMMA_SUPPORTED)
3308PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3309 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3310 int gamma_shift));
3311#endif
3312
3313#if defined(PNG_READ_EXPAND_SUPPORTED)
3314PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3315 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3316PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3317 png_bytep row, png_color_16p trans_value));
3318#endif
3319
3320/* The following decodes the appropriate chunks, and does error correction,
3321 * then calls the appropriate callback for the chunk if it is valid.
3322 */
3323
3324/* decode the IHDR chunk */
3325PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3326 png_uint_32 length));
3327PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3328 png_uint_32 length));
3329PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3330 png_uint_32 length));
3331
3332#if defined(PNG_READ_bKGD_SUPPORTED)
3333PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3334 png_uint_32 length));
3335#endif
3336
3337#if defined(PNG_READ_cHRM_SUPPORTED)
3338PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3339 png_uint_32 length));
3340#endif
3341
3342#if defined(PNG_READ_gAMA_SUPPORTED)
3343PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3344 png_uint_32 length));
3345#endif
3346
3347#if defined(PNG_READ_hIST_SUPPORTED)
3348PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3349 png_uint_32 length));
3350#endif
3351
3352#if defined(PNG_READ_iCCP_SUPPORTED)
3353extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3354 png_uint_32 length));
3355#endif /* PNG_READ_iCCP_SUPPORTED */
3356
3357#if defined(PNG_READ_iTXt_SUPPORTED)
3358PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3359 png_uint_32 length));
3360#endif
3361
3362#if defined(PNG_READ_oFFs_SUPPORTED)
3363PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3364 png_uint_32 length));
3365#endif
3366
3367#if defined(PNG_READ_pCAL_SUPPORTED)
3368PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3369 png_uint_32 length));
3370#endif
3371
3372#if defined(PNG_READ_pHYs_SUPPORTED)
3373PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3374 png_uint_32 length));
3375#endif
3376
3377#if defined(PNG_READ_sBIT_SUPPORTED)
3378PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3379 png_uint_32 length));
3380#endif
3381
3382#if defined(PNG_READ_sCAL_SUPPORTED)
3383PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3384 png_uint_32 length));
3385#endif
3386
3387#if defined(PNG_READ_sPLT_SUPPORTED)
3388extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3389 png_uint_32 length));
3390#endif /* PNG_READ_sPLT_SUPPORTED */
3391
3392#if defined(PNG_READ_sRGB_SUPPORTED)
3393PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3394 png_uint_32 length));
3395#endif
3396
3397#if defined(PNG_READ_tEXt_SUPPORTED)
3398PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3399 png_uint_32 length));
3400#endif
3401
3402#if defined(PNG_READ_tIME_SUPPORTED)
3403PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3404 png_uint_32 length));
3405#endif
3406
3407#if defined(PNG_READ_tRNS_SUPPORTED)
3408PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3409 png_uint_32 length));
3410#endif
3411
3412#if defined(PNG_READ_zTXt_SUPPORTED)
3413PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3414 png_uint_32 length));
3415#endif
3416
3417PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3418 png_infop info_ptr, png_uint_32 length));
3419
3420PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3421 png_bytep chunk_name));
3422
3423/* handle the transformations for reading and writing */
3424PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3425PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3426
3427PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3428
3429#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3430PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3431 png_infop info_ptr));
3432PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3433 png_infop info_ptr));
3434PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3435PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3436 png_uint_32 length));
3437PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3438PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3439PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3440 png_bytep buffer, png_size_t buffer_length));
3441PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3442PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3443 png_bytep buffer, png_size_t buffer_length));
3444PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3445PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3446 png_infop info_ptr, png_uint_32 length));
3447PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3448 png_infop info_ptr));
3449PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3450 png_infop info_ptr));
3451PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3452PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3453 png_infop info_ptr));
3454PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3455 png_infop info_ptr));
3456PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3457#if defined(PNG_READ_tEXt_SUPPORTED)
3458PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3459 png_infop info_ptr, png_uint_32 length));
3460PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3461 png_infop info_ptr));
3462#endif
3463#if defined(PNG_READ_zTXt_SUPPORTED)
3464PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3465 png_infop info_ptr, png_uint_32 length));
3466PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3467 png_infop info_ptr));
3468#endif
3469#if defined(PNG_READ_iTXt_SUPPORTED)
3470PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3471 png_infop info_ptr, png_uint_32 length));
3472PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3473 png_infop info_ptr));
3474#endif
3475
3476#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3477
3478#ifdef PNG_MNG_FEATURES_SUPPORTED
3479PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3480 png_bytep row));
3481PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3482 png_bytep row));
3483#endif
3484
3485#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3486#if defined(PNG_MMX_CODE_SUPPORTED)
3487/* png.c */ /* PRIVATE */
3488PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3489#endif
3490#endif
3491
3492#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3493PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3494png_infop info_ptr));
3495
3496PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3497png_infop info_ptr));
3498
3499PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3500png_infop info_ptr));
3501
3502PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3503png_infop info_ptr));
3504
3505PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3506png_infop info_ptr));
3507
3508#if defined(PNG_pHYs_SUPPORTED)
3509PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3510png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3511#endif /* PNG_pHYs_SUPPORTED */
3512#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3513
3514/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3515
3516#endif /* PNG_INTERNAL */
3517
3518#ifdef __cplusplus
3519}
3520#endif
3521
3522#endif /* PNG_VERSION_INFO_ONLY */
3523/* do not put anything past this line */
3524#endif /* PNG_H */
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