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- Committer: Bazaar Package Importer
- Author(s): Mario Iseli
- Date: 2006-04-08 18:38:25 UTC
- mfrom: (1.1.2 upstream) (2.1.1 etch)
- Revision ID: james.westby@ubuntu.com-20060408183825-vu1jk57rk929derx
* New Maintainer (Closes: #361345)
* New upstream release (Closes: #349725)
* Build-Depend now on libslang2-dev (Closes: #325577)
* Complete rebuild of debian/, upgraded to policy-standards
3.6.2 and compat-level 5.
* Removed stellarc since stella only reads ~/.stellarc and even
works without a first config.
* New debian/watch file.
* New upstream release (Closes: #349725)
* Build-Depend now on libslang2-dev (Closes: #325577)
* Complete rebuild of debian/, upgraded to policy-standards
3.6.2 and compat-level 5.
* Removed stellarc since stella only reads ~/.stellarc and even
works without a first config.
* New debian/watch file.
- files added:
- Makefile
- src/cheat
- src/debugger
- src/debugger/gui
- src/gp2x
- src/gui
- src/macosx/libpng
- src/macosx/libpng/libpng.xcodeproj
- src/macosx/stella.xcodeproj
- src/psp
- src/psp/data
- src/tools
- src/wince
- src/yacc
- files removed:
- debian/conffiles
- src/build
- src/macosx/build
- src/win32/Stella
- src/win32/StellaX
- files modified:
- Announce.txt
added
removed
src/macosx/libpng/png.h
1
/* png.h - header file for PNG reference library
2
*
3
* libpng version 1.2.5 - October 3, 2002
4
* Copyright (c) 1998-2002 Glenn Randers-Pehrson
5
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
6
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
7
*
8
* Authors and maintainers:
9
* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
10
* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
11
* libpng versions 0.97, January 1998, through 1.2.5 - October 3, 2002: Glenn
12
* See also "Contributing Authors", below.
13
*
14
* Note about libpng version numbers:
15
*
16
* Due to various miscommunications, unforeseen code incompatibilities
17
* and occasional factors outside the authors' control, version numbering
18
* on the library has not always been consistent and straightforward.
19
* The following table summarizes matters since version 0.89c, which was
20
* the first widely used release:
21
*
22
* source png.h png.h shared-lib
23
* version string int version
24
* ------- ------ ----- ----------
25
* 0.89c "1.0 beta 3" 0.89 89 1.0.89
26
* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
27
* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
28
* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
29
* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
30
* 0.97c 0.97 97 2.0.97
31
* 0.98 0.98 98 2.0.98
32
* 0.99 0.99 98 2.0.99
33
* 0.99a-m 0.99 99 2.0.99
34
* 1.00 1.00 100 2.1.0 [100 should be 10000]
35
* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
36
* 1.0.1 png.h string is 10001 2.1.0
37
* 1.0.1a-e identical to the 10002 from here on, the shared library
38
* 1.0.2 source version) 10002 is 2.V where V is the source code
39
* 1.0.2a-b 10003 version, except as noted.
40
* 1.0.3 10003
41
* 1.0.3a-d 10004
42
* 1.0.4 10004
43
* 1.0.4a-f 10005
44
* 1.0.5 (+ 2 patches) 10005
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* 1.0.5a-d 10006
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* 1.0.5e-r 10100 (not source compatible)
47
* 1.0.5s-v 10006 (not binary compatible)
48
* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
49
* 1.0.6d-f 10007 (still binary incompatible)
50
* 1.0.6g 10007
51
* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
52
* 1.0.6i 10007 10.6i
53
* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
54
* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
55
* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
56
* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
57
* 1.0.7 1 10007 (still compatible)
58
* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
59
* 1.0.8rc1 1 10008 2.1.0.8rc1
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* 1.0.8 1 10008 2.1.0.8
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* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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* 1.0.9rc1 1 10009 2.1.0.9rc1
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* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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* 1.0.9rc2 1 10009 2.1.0.9rc2
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* 1.0.9 1 10009 2.1.0.9
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* 1.0.10beta1 1 10010 2.1.0.10beta1
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* 1.0.10rc1 1 10010 2.1.0.10rc1
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* 1.0.10 1 10010 2.1.0.10
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* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
70
* 1.0.11rc1 1 10011 2.1.0.11rc1
71
* 1.0.11 1 10011 2.1.0.11
72
* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
73
* 1.0.12rc1 2 10012 2.1.0.12rc1
74
* 1.0.12 2 10012 2.1.0.12
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* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
76
* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
77
* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
78
* 1.2.0rc1 3 10200 3.1.2.0rc1
79
* 1.2.0 3 10200 3.1.2.0
80
* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
81
* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
82
* 1.2.1 3 10201 3.1.2.1
83
* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
84
* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
85
* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
86
* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
87
* 1.0.13 10 10013 10.so.0.1.0.13
88
* 1.2.2 12 10202 12.so.0.1.2.2
89
* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
90
* 1.2.3 12 10203 12.so.0.1.2.3
91
* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
92
* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
93
* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
94
* 1.0.14 10 10014 10.so.0.1.0.14
95
* 1.2.4 13 10204 12.so.0.1.2.4
96
* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
97
* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
98
* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
99
* 1.0.15 10 10015 10.so.0.1.0.15
100
* 1.2.5 13 10205 12.so.0.1.2.5
101
*
102
* Henceforth the source version will match the shared-library major
103
* and minor numbers; the shared-library major version number will be
104
* used for changes in backward compatibility, as it is intended. The
105
* PNG_LIBPNG_VER macro, which is not used within libpng but is available
106
* for applications, is an unsigned integer of the form xyyzz corresponding
107
* to the source version x.y.z (leading zeros in y and z). Beta versions
108
* were given the previous public release number plus a letter, until
109
* version 1.0.6j; from then on they were given the upcoming public
110
* release number plus "betaNN" or "rcN".
111
*
112
* Binary incompatibility exists only when applications make direct access
113
* to the info_ptr or png_ptr members through png.h, and the compiled
114
* application is loaded with a different version of the library.
115
*
116
* DLLNUM will change each time there are forward or backward changes
117
* in binary compatibility (e.g., when a new feature is added).
118
*
119
* See libpng.txt or libpng.3 for more information. The PNG specification
120
* is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
121
* and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
122
*/
123
124
/*
125
* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
126
*
127
* If you modify libpng you may insert additional notices immediately following
128
* this sentence.
129
*
130
* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
131
* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
132
* distributed according to the same disclaimer and license as libpng-1.0.6
133
* with the following individuals added to the list of Contributing Authors
134
*
135
* Simon-Pierre Cadieux
136
* Eric S. Raymond
137
* Gilles Vollant
138
*
139
* and with the following additions to the disclaimer:
140
*
141
* There is no warranty against interference with your enjoyment of the
142
* library or against infringement. There is no warranty that our
143
* efforts or the library will fulfill any of your particular purposes
144
* or needs. This library is provided with all faults, and the entire
145
* risk of satisfactory quality, performance, accuracy, and effort is with
146
* the user.
147
*
148
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
149
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
150
* Distributed according to the same disclaimer and license as libpng-0.96,
151
* with the following individuals added to the list of Contributing Authors:
152
*
153
* Tom Lane
154
* Glenn Randers-Pehrson
155
* Willem van Schaik
156
*
157
* libpng versions 0.89, June 1996, through 0.96, May 1997, are
158
* Copyright (c) 1996, 1997 Andreas Dilger
159
* Distributed according to the same disclaimer and license as libpng-0.88,
160
* with the following individuals added to the list of Contributing Authors:
161
*
162
* John Bowler
163
* Kevin Bracey
164
* Sam Bushell
165
* Magnus Holmgren
166
* Greg Roelofs
167
* Tom Tanner
168
*
169
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
170
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
171
*
172
* For the purposes of this copyright and license, "Contributing Authors"
173
* is defined as the following set of individuals:
174
*
175
* Andreas Dilger
176
* Dave Martindale
177
* Guy Eric Schalnat
178
* Paul Schmidt
179
* Tim Wegner
180
*
181
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
182
* and Group 42, Inc. disclaim all warranties, expressed or implied,
183
* including, without limitation, the warranties of merchantability and of
184
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
185
* assume no liability for direct, indirect, incidental, special, exemplary,
186
* or consequential damages, which may result from the use of the PNG
187
* Reference Library, even if advised of the possibility of such damage.
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*
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* Permission is hereby granted to use, copy, modify, and distribute this
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* source code, or portions hereof, for any purpose, without fee, subject
191
* to the following restrictions:
192
*
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* 1. The origin of this source code must not be misrepresented.
194
*
195
* 2. Altered versions must be plainly marked as such and
196
* must not be misrepresented as being the original source.
197
*
198
* 3. This Copyright notice may not be removed or altered from
199
* any source or altered source distribution.
200
*
201
* The Contributing Authors and Group 42, Inc. specifically permit, without
202
* fee, and encourage the use of this source code as a component to
203
* supporting the PNG file format in commercial products. If you use this
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* source code in a product, acknowledgment is not required but would be
205
* appreciated.
206
*/
207
208
/*
209
* A "png_get_copyright" function is available, for convenient use in "about"
210
* boxes and the like:
211
*
212
* printf("%s",png_get_copyright(NULL));
213
*
214
* Also, the PNG logo (in PNG format, of course) is supplied in the
215
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
216
*/
217
218
/*
219
* Libpng is OSI Certified Open Source Software. OSI Certified is a
220
* certification mark of the Open Source Initiative.
221
*/
222
223
/*
224
* The contributing authors would like to thank all those who helped
225
* with testing, bug fixes, and patience. This wouldn't have been
226
* possible without all of you.
227
*
228
* Thanks to Frank J. T. Wojcik for helping with the documentation.
229
*/
230
231
/*
232
* Y2K compliance in libpng:
233
* =========================
234
*
235
* October 3, 2002
236
*
237
* Since the PNG Development group is an ad-hoc body, we can't make
238
* an official declaration.
239
*
240
* This is your unofficial assurance that libpng from version 0.71 and
241
* upward through 1.2.5 are Y2K compliant. It is my belief that earlier
242
* versions were also Y2K compliant.
243
*
244
* Libpng only has three year fields. One is a 2-byte unsigned integer
245
* that will hold years up to 65535. The other two hold the date in text
246
* format, and will hold years up to 9999.
247
*
248
* The integer is
249
* "png_uint_16 year" in png_time_struct.
250
*
251
* The strings are
252
* "png_charp time_buffer" in png_struct and
253
* "near_time_buffer", which is a local character string in png.c.
254
*
255
* There are seven time-related functions:
256
* png.c: png_convert_to_rfc_1123() in png.c
257
* (formerly png_convert_to_rfc_1152() in error)
258
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
259
* png_convert_from_time_t() in pngwrite.c
260
* png_get_tIME() in pngget.c
261
* png_handle_tIME() in pngrutil.c, called in pngread.c
262
* png_set_tIME() in pngset.c
263
* png_write_tIME() in pngwutil.c, called in pngwrite.c
264
*
265
* All handle dates properly in a Y2K environment. The
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* png_convert_from_time_t() function calls gmtime() to convert from system
267
* clock time, which returns (year - 1900), which we properly convert to
268
* the full 4-digit year. There is a possibility that applications using
269
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
270
* function, or that they are incorrectly passing only a 2-digit year
271
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
272
* but this is not under our control. The libpng documentation has always
273
* stated that it works with 4-digit years, and the APIs have been
274
* documented as such.
275
*
276
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
277
* integer to hold the year, and can hold years as large as 65535.
278
*
279
* zlib, upon which libpng depends, is also Y2K compliant. It contains
280
* no date-related code.
281
*
282
* Glenn Randers-Pehrson
283
* libpng maintainer
284
* PNG Development Group
285
*/
286
287
#ifndef PNG_H
288
#define PNG_H
289
290
/* This is not the place to learn how to use libpng. The file libpng.txt
291
* describes how to use libpng, and the file example.c summarizes it
292
* with some code on which to build. This file is useful for looking
293
* at the actual function definitions and structure components.
294
*/
295
296
/* Version information for png.h - this should match the version in png.c */
297
#define PNG_LIBPNG_VER_STRING "1.2.5"
298
299
#define PNG_LIBPNG_VER_SONUM 0
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#define PNG_LIBPNG_VER_DLLNUM %DLLNUM%
301
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/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
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#define PNG_LIBPNG_VER_MAJOR 1
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#define PNG_LIBPNG_VER_MINOR 2
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#define PNG_LIBPNG_VER_RELEASE 5
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/* This should match the numeric part of the final component of
307
* PNG_LIBPNG_VER_STRING, omitting any leading zero: */
308
309
#define PNG_LIBPNG_VER_BUILD 0
310
311
#define PNG_LIBPNG_BUILD_ALPHA 1
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#define PNG_LIBPNG_BUILD_BETA 2
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#define PNG_LIBPNG_BUILD_RC 3
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#define PNG_LIBPNG_BUILD_STABLE 4
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#define PNG_LIBPNG_BUILD_TYPEMASK 7
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#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with STABLE only */
317
#define PNG_LIBPNG_BUILD_TYPE 4
318
319
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
320
* We must not include leading zeros.
321
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
322
* version 1.0.0 was mis-numbered 100 instead of 10000). From
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* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
324
#define PNG_LIBPNG_VER 10205 /* 1.2.5 */
325
326
#ifndef PNG_VERSION_INFO_ONLY
327
328
/* include the compression library's header */
329
#include "zlib.h"
330
331
/* include all user configurable info, including optional assembler routines */
332
#include "pngconf.h"
333
334
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
335
#ifdef __cplusplus
336
extern "C" {
337
#endif /* __cplusplus */
338
339
/* This file is arranged in several sections. The first section contains
340
* structure and type definitions. The second section contains the external
341
* library functions, while the third has the internal library functions,
342
* which applications aren't expected to use directly.
343
*/
344
345
#ifndef PNG_NO_TYPECAST_NULL
346
#define int_p_NULL (int *)NULL
347
#define png_bytep_NULL (png_bytep)NULL
348
#define png_bytepp_NULL (png_bytepp)NULL
349
#define png_doublep_NULL (png_doublep)NULL
350
#define png_error_ptr_NULL (png_error_ptr)NULL
351
#define png_flush_ptr_NULL (png_flush_ptr)NULL
352
#define png_free_ptr_NULL (png_free_ptr)NULL
353
#define png_infopp_NULL (png_infopp)NULL
354
#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
355
#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
356
#define png_rw_ptr_NULL (png_rw_ptr)NULL
357
#define png_structp_NULL (png_structp)NULL
358
#define png_uint_16p_NULL (png_uint_16p)NULL
359
#define png_voidp_NULL (png_voidp)NULL
360
#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
361
#else
362
#define int_p_NULL NULL
363
#define png_bytep_NULL NULL
364
#define png_bytepp_NULL NULL
365
#define png_doublep_NULL NULL
366
#define png_error_ptr_NULL NULL
367
#define png_flush_ptr_NULL NULL
368
#define png_free_ptr_NULL NULL
369
#define png_infopp_NULL NULL
370
#define png_malloc_ptr_NULL NULL
371
#define png_read_status_ptr_NULL NULL
372
#define png_rw_ptr_NULL NULL
373
#define png_structp_NULL NULL
374
#define png_uint_16p_NULL NULL
375
#define png_voidp_NULL NULL
376
#define png_write_status_ptr_NULL NULL
377
#endif
378
379
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
380
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
381
/* Version information for C files, stored in png.c. This had better match
382
* the version above.
383
*/
384
#ifdef PNG_USE_GLOBAL_ARRAYS
385
PNG_EXPORT_VAR (const char) png_libpng_ver[18];
386
/* need room for 99.99.99beta99z */
387
#else
388
#define png_libpng_ver png_get_header_ver(NULL)
389
#endif
390
391
#ifdef PNG_USE_GLOBAL_ARRAYS
392
/* This was removed in version 1.0.5c */
393
/* Structures to facilitate easy interlacing. See png.c for more details */
394
PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
395
PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
396
PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
397
PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
398
PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
399
PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
400
#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
401
PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
402
#endif
403
/* This isn't currently used. If you need it, see png.c for more details.
404
PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
405
*/
406
#endif
407
408
#endif /* PNG_NO_EXTERN */
409
410
/* Three color definitions. The order of the red, green, and blue, (and the
411
* exact size) is not important, although the size of the fields need to
412
* be png_byte or png_uint_16 (as defined below).
413
*/
414
typedef struct png_color_struct
415
{
416
png_byte red;
417
png_byte green;
418
png_byte blue;
419
} png_color;
420
typedef png_color FAR * png_colorp;
421
typedef png_color FAR * FAR * png_colorpp;
422
423
typedef struct png_color_16_struct
424
{
425
png_byte index; /* used for palette files */
426
png_uint_16 red; /* for use in red green blue files */
427
png_uint_16 green;
428
png_uint_16 blue;
429
png_uint_16 gray; /* for use in grayscale files */
430
} png_color_16;
431
typedef png_color_16 FAR * png_color_16p;
432
typedef png_color_16 FAR * FAR * png_color_16pp;
433
434
typedef struct png_color_8_struct
435
{
436
png_byte red; /* for use in red green blue files */
437
png_byte green;
438
png_byte blue;
439
png_byte gray; /* for use in grayscale files */
440
png_byte alpha; /* for alpha channel files */
441
} png_color_8;
442
typedef png_color_8 FAR * png_color_8p;
443
typedef png_color_8 FAR * FAR * png_color_8pp;
444
445
/*
446
* The following two structures are used for the in-core representation
447
* of sPLT chunks.
448
*/
449
typedef struct png_sPLT_entry_struct
450
{
451
png_uint_16 red;
452
png_uint_16 green;
453
png_uint_16 blue;
454
png_uint_16 alpha;
455
png_uint_16 frequency;
456
} png_sPLT_entry;
457
typedef png_sPLT_entry FAR * png_sPLT_entryp;
458
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
459
460
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
461
* occupy the LSB of their respective members, and the MSB of each member
462
* is zero-filled. The frequency member always occupies the full 16 bits.
463
*/
464
465
typedef struct png_sPLT_struct
466
{
467
png_charp name; /* palette name */
468
png_byte depth; /* depth of palette samples */
469
png_sPLT_entryp entries; /* palette entries */
470
png_int_32 nentries; /* number of palette entries */
471
} png_sPLT_t;
472
typedef png_sPLT_t FAR * png_sPLT_tp;
473
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
474
475
#ifdef PNG_TEXT_SUPPORTED
476
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
477
* and whether that contents is compressed or not. The "key" field
478
* points to a regular zero-terminated C string. The "text", "lang", and
479
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
480
* However, the * structure returned by png_get_text() will always contain
481
* regular zero-terminated C strings (possibly empty), never NULL pointers,
482
* so they can be safely used in printf() and other string-handling functions.
483
*/
484
typedef struct png_text_struct
485
{
486
int compression; /* compression value:
487
-1: tEXt, none
488
0: zTXt, deflate
489
1: iTXt, none
490
2: iTXt, deflate */
491
png_charp key; /* keyword, 1-79 character description of "text" */
492
png_charp text; /* comment, may be an empty string (ie "")
493
or a NULL pointer */
494
png_size_t text_length; /* length of the text string */
495
#ifdef PNG_iTXt_SUPPORTED
496
png_size_t itxt_length; /* length of the itxt string */
497
png_charp lang; /* language code, 0-79 characters
498
or a NULL pointer */
499
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
500
chars or a NULL pointer */
501
#endif
502
} png_text;
503
typedef png_text FAR * png_textp;
504
typedef png_text FAR * FAR * png_textpp;
505
#endif
506
507
/* Supported compression types for text in PNG files (tEXt, and zTXt).
508
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
509
#define PNG_TEXT_COMPRESSION_NONE_WR -3
510
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
511
#define PNG_TEXT_COMPRESSION_NONE -1
512
#define PNG_TEXT_COMPRESSION_zTXt 0
513
#define PNG_ITXT_COMPRESSION_NONE 1
514
#define PNG_ITXT_COMPRESSION_zTXt 2
515
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
516
517
/* png_time is a way to hold the time in an machine independent way.
518
* Two conversions are provided, both from time_t and struct tm. There
519
* is no portable way to convert to either of these structures, as far
520
* as I know. If you know of a portable way, send it to me. As a side
521
* note - PNG has always been Year 2000 compliant!
522
*/
523
typedef struct png_time_struct
524
{
525
png_uint_16 year; /* full year, as in, 1995 */
526
png_byte month; /* month of year, 1 - 12 */
527
png_byte day; /* day of month, 1 - 31 */
528
png_byte hour; /* hour of day, 0 - 23 */
529
png_byte minute; /* minute of hour, 0 - 59 */
530
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
531
} png_time;
532
typedef png_time FAR * png_timep;
533
typedef png_time FAR * FAR * png_timepp;
534
535
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
536
/* png_unknown_chunk is a structure to hold queued chunks for which there is
537
* no specific support. The idea is that we can use this to queue
538
* up private chunks for output even though the library doesn't actually
539
* know about their semantics.
540
*/
541
typedef struct png_unknown_chunk_t
542
{
543
png_byte name[5];
544
png_byte *data;
545
png_size_t size;
546
547
/* libpng-using applications should NOT directly modify this byte. */
548
png_byte location; /* mode of operation at read time */
549
}
550
png_unknown_chunk;
551
typedef png_unknown_chunk FAR * png_unknown_chunkp;
552
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
553
#endif
554
555
/* png_info is a structure that holds the information in a PNG file so
556
* that the application can find out the characteristics of the image.
557
* If you are reading the file, this structure will tell you what is
558
* in the PNG file. If you are writing the file, fill in the information
559
* you want to put into the PNG file, then call png_write_info().
560
* The names chosen should be very close to the PNG specification, so
561
* consult that document for information about the meaning of each field.
562
*
563
* With libpng < 0.95, it was only possible to directly set and read the
564
* the values in the png_info_struct, which meant that the contents and
565
* order of the values had to remain fixed. With libpng 0.95 and later,
566
* however, there are now functions that abstract the contents of
567
* png_info_struct from the application, so this makes it easier to use
568
* libpng with dynamic libraries, and even makes it possible to use
569
* libraries that don't have all of the libpng ancillary chunk-handing
570
* functionality.
571
*
572
* In any case, the order of the parameters in png_info_struct should NOT
573
* be changed for as long as possible to keep compatibility with applications
574
* that use the old direct-access method with png_info_struct.
575
*
576
* The following members may have allocated storage attached that should be
577
* cleaned up before the structure is discarded: palette, trans, text,
578
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
579
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
580
* are automatically freed when the info structure is deallocated, if they were
581
* allocated internally by libpng. This behavior can be changed by means
582
* of the png_data_freer() function.
583
*
584
* More allocation details: all the chunk-reading functions that
585
* change these members go through the corresponding png_set_*
586
* functions. A function to clear these members is available: see
587
* png_free_data(). The png_set_* functions do not depend on being
588
* able to point info structure members to any of the storage they are
589
* passed (they make their own copies), EXCEPT that the png_set_text
590
* functions use the same storage passed to them in the text_ptr or
591
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
592
* functions do not make their own copies.
593
*/
594
typedef struct png_info_struct
595
{
596
/* the following are necessary for every PNG file */
597
png_uint_32 width; /* width of image in pixels (from IHDR) */
598
png_uint_32 height; /* height of image in pixels (from IHDR) */
599
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
600
png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
601
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
602
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
603
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
604
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
605
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
606
/* The following three should have been named *_method not *_type */
607
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
608
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
609
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
610
611
/* The following is informational only on read, and not used on writes. */
612
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
613
png_byte pixel_depth; /* number of bits per pixel */
614
png_byte spare_byte; /* to align the data, and for future use */
615
png_byte signature[8]; /* magic bytes read by libpng from start of file */
616
617
/* The rest of the data is optional. If you are reading, check the
618
* valid field to see if the information in these are valid. If you
619
* are writing, set the valid field to those chunks you want written,
620
* and initialize the appropriate fields below.
621
*/
622
623
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
624
/* The gAMA chunk describes the gamma characteristics of the system
625
* on which the image was created, normally in the range [1.0, 2.5].
626
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
627
*/
628
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
629
#endif
630
631
#if defined(PNG_sRGB_SUPPORTED)
632
/* GR-P, 0.96a */
633
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
634
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
635
#endif
636
637
#if defined(PNG_TEXT_SUPPORTED)
638
/* The tEXt, and zTXt chunks contain human-readable textual data in
639
* uncompressed, compressed, and optionally compressed forms, respectively.
640
* The data in "text" is an array of pointers to uncompressed,
641
* null-terminated C strings. Each chunk has a keyword that describes the
642
* textual data contained in that chunk. Keywords are not required to be
643
* unique, and the text string may be empty. Any number of text chunks may
644
* be in an image.
645
*/
646
int num_text; /* number of comments read/to write */
647
int max_text; /* current size of text array */
648
png_textp text; /* array of comments read/to write */
649
#endif /* PNG_TEXT_SUPPORTED */
650
651
#if defined(PNG_tIME_SUPPORTED)
652
/* The tIME chunk holds the last time the displayed image data was
653
* modified. See the png_time struct for the contents of this struct.
654
*/
655
png_time mod_time;
656
#endif
657
658
#if defined(PNG_sBIT_SUPPORTED)
659
/* The sBIT chunk specifies the number of significant high-order bits
660
* in the pixel data. Values are in the range [1, bit_depth], and are
661
* only specified for the channels in the pixel data. The contents of
662
* the low-order bits is not specified. Data is valid if
663
* (valid & PNG_INFO_sBIT) is non-zero.
664
*/
665
png_color_8 sig_bit; /* significant bits in color channels */
666
#endif
667
668
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
669
defined(PNG_READ_BACKGROUND_SUPPORTED)
670
/* The tRNS chunk supplies transparency data for paletted images and
671
* other image types that don't need a full alpha channel. There are
672
* "num_trans" transparency values for a paletted image, stored in the
673
* same order as the palette colors, starting from index 0. Values
674
* for the data are in the range [0, 255], ranging from fully transparent
675
* to fully opaque, respectively. For non-paletted images, there is a
676
* single color specified that should be treated as fully transparent.
677
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
678
*/
679
png_bytep trans; /* transparent values for paletted image */
680
png_color_16 trans_values; /* transparent color for non-palette image */
681
#endif
682
683
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
684
/* The bKGD chunk gives the suggested image background color if the
685
* display program does not have its own background color and the image
686
* is needs to composited onto a background before display. The colors
687
* in "background" are normally in the same color space/depth as the
688
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
689
*/
690
png_color_16 background;
691
#endif
692
693
#if defined(PNG_oFFs_SUPPORTED)
694
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
695
* and downwards from the top-left corner of the display, page, or other
696
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
697
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
698
*/
699
png_int_32 x_offset; /* x offset on page */
700
png_int_32 y_offset; /* y offset on page */
701
png_byte offset_unit_type; /* offset units type */
702
#endif
703
704
#if defined(PNG_pHYs_SUPPORTED)
705
/* The pHYs chunk gives the physical pixel density of the image for
706
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
707
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
708
*/
709
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
710
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
711
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
712
#endif
713
714
#if defined(PNG_hIST_SUPPORTED)
715
/* The hIST chunk contains the relative frequency or importance of the
716
* various palette entries, so that a viewer can intelligently select a
717
* reduced-color palette, if required. Data is an array of "num_palette"
718
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
719
* is non-zero.
720
*/
721
png_uint_16p hist;
722
#endif
723
724
#ifdef PNG_cHRM_SUPPORTED
725
/* The cHRM chunk describes the CIE color characteristics of the monitor
726
* on which the PNG was created. This data allows the viewer to do gamut
727
* mapping of the input image to ensure that the viewer sees the same
728
* colors in the image as the creator. Values are in the range
729
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
730
*/
731
#ifdef PNG_FLOATING_POINT_SUPPORTED
732
float x_white;
733
float y_white;
734
float x_red;
735
float y_red;
736
float x_green;
737
float y_green;
738
float x_blue;
739
float y_blue;
740
#endif
741
#endif
742
743
#if defined(PNG_pCAL_SUPPORTED)
744
/* The pCAL chunk describes a transformation between the stored pixel
745
* values and original physical data values used to create the image.
746
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
747
* range given by [pcal_X0, pcal_X1], and are further transformed by a
748
* (possibly non-linear) transformation function given by "pcal_type"
749
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
750
* defines below, and the PNG-Group's PNG extensions document for a
751
* complete description of the transformations and how they should be
752
* implemented, and for a description of the ASCII parameter strings.
753
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
754
*/
755
png_charp pcal_purpose; /* pCAL chunk description string */
756
png_int_32 pcal_X0; /* minimum value */
757
png_int_32 pcal_X1; /* maximum value */
758
png_charp pcal_units; /* Latin-1 string giving physical units */
759
png_charpp pcal_params; /* ASCII strings containing parameter values */
760
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
761
png_byte pcal_nparams; /* number of parameters given in pcal_params */
762
#endif
763
764
/* New members added in libpng-1.0.6 */
765
#ifdef PNG_FREE_ME_SUPPORTED
766
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
767
#endif
768
769
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
770
/* storage for unknown chunks that the library doesn't recognize. */
771
png_unknown_chunkp unknown_chunks;
772
png_size_t unknown_chunks_num;
773
#endif
774
775
#if defined(PNG_iCCP_SUPPORTED)
776
/* iCCP chunk data. */
777
png_charp iccp_name; /* profile name */
778
png_charp iccp_profile; /* International Color Consortium profile data */
779
/* Note to maintainer: should be png_bytep */
780
png_uint_32 iccp_proflen; /* ICC profile data length */
781
png_byte iccp_compression; /* Always zero */
782
#endif
783
784
#if defined(PNG_sPLT_SUPPORTED)
785
/* data on sPLT chunks (there may be more than one). */
786
png_sPLT_tp splt_palettes;
787
png_uint_32 splt_palettes_num;
788
#endif
789
790
#if defined(PNG_sCAL_SUPPORTED)
791
/* The sCAL chunk describes the actual physical dimensions of the
792
* subject matter of the graphic. The chunk contains a unit specification
793
* a byte value, and two ASCII strings representing floating-point
794
* values. The values are width and height corresponsing to one pixel
795
* in the image. This external representation is converted to double
796
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
797
*/
798
png_byte scal_unit; /* unit of physical scale */
799
#ifdef PNG_FLOATING_POINT_SUPPORTED
800
double scal_pixel_width; /* width of one pixel */
801
double scal_pixel_height; /* height of one pixel */
802
#endif
803
#ifdef PNG_FIXED_POINT_SUPPORTED
804
png_charp scal_s_width; /* string containing height */
805
png_charp scal_s_height; /* string containing width */
806
#endif
807
#endif
808
809
#if defined(PNG_INFO_IMAGE_SUPPORTED)
810
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
811
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
812
png_bytepp row_pointers; /* the image bits */
813
#endif
814
815
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
816
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
817
#endif
818
819
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
820
png_fixed_point int_x_white;
821
png_fixed_point int_y_white;
822
png_fixed_point int_x_red;
823
png_fixed_point int_y_red;
824
png_fixed_point int_x_green;
825
png_fixed_point int_y_green;
826
png_fixed_point int_x_blue;
827
png_fixed_point int_y_blue;
828
#endif
829
830
} png_info;
831
832
typedef png_info FAR * png_infop;
833
typedef png_info FAR * FAR * png_infopp;
834
835
/* Maximum positive integer used in PNG is (2^31)-1 */
836
#define PNG_MAX_UINT ((png_uint_32)0x7fffffffL)
837
838
/* These describe the color_type field in png_info. */
839
/* color type masks */
840
#define PNG_COLOR_MASK_PALETTE 1
841
#define PNG_COLOR_MASK_COLOR 2
842
#define PNG_COLOR_MASK_ALPHA 4
843
844
/* color types. Note that not all combinations are legal */
845
#define PNG_COLOR_TYPE_GRAY 0
846
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
847
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
848
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
849
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
850
/* aliases */
851
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
852
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
853
854
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
855
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
856
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
857
858
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
859
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
860
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
861
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
862
863
/* These are for the interlacing type. These values should NOT be changed. */
864
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
865
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
866
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
867
868
/* These are for the oFFs chunk. These values should NOT be changed. */
869
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
870
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
871
#define PNG_OFFSET_LAST 2 /* Not a valid value */
872
873
/* These are for the pCAL chunk. These values should NOT be changed. */
874
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
875
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
876
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
877
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
878
#define PNG_EQUATION_LAST 4 /* Not a valid value */
879
880
/* These are for the sCAL chunk. These values should NOT be changed. */
881
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
882
#define PNG_SCALE_METER 1 /* meters per pixel */
883
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
884
#define PNG_SCALE_LAST 3 /* Not a valid value */
885
886
/* These are for the pHYs chunk. These values should NOT be changed. */
887
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
888
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
889
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
890
891
/* These are for the sRGB chunk. These values should NOT be changed. */
892
#define PNG_sRGB_INTENT_PERCEPTUAL 0
893
#define PNG_sRGB_INTENT_RELATIVE 1
894
#define PNG_sRGB_INTENT_SATURATION 2
895
#define PNG_sRGB_INTENT_ABSOLUTE 3
896
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
897
898
/* This is for text chunks */
899
#define PNG_KEYWORD_MAX_LENGTH 79
900
901
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
902
#define PNG_MAX_PALETTE_LENGTH 256
903
904
/* These determine if an ancillary chunk's data has been successfully read
905
* from the PNG header, or if the application has filled in the corresponding
906
* data in the info_struct to be written into the output file. The values
907
* of the PNG_INFO_<chunk> defines should NOT be changed.
908
*/
909
#define PNG_INFO_gAMA 0x0001
910
#define PNG_INFO_sBIT 0x0002
911
#define PNG_INFO_cHRM 0x0004
912
#define PNG_INFO_PLTE 0x0008
913
#define PNG_INFO_tRNS 0x0010
914
#define PNG_INFO_bKGD 0x0020
915
#define PNG_INFO_hIST 0x0040
916
#define PNG_INFO_pHYs 0x0080
917
#define PNG_INFO_oFFs 0x0100
918
#define PNG_INFO_tIME 0x0200
919
#define PNG_INFO_pCAL 0x0400
920
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
921
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
922
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
923
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
924
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
925
926
/* This is used for the transformation routines, as some of them
927
* change these values for the row. It also should enable using
928
* the routines for other purposes.
929
*/
930
typedef struct png_row_info_struct
931
{
932
png_uint_32 width; /* width of row */
933
png_uint_32 rowbytes; /* number of bytes in row */
934
png_byte color_type; /* color type of row */
935
png_byte bit_depth; /* bit depth of row */
936
png_byte channels; /* number of channels (1, 2, 3, or 4) */
937
png_byte pixel_depth; /* bits per pixel (depth * channels) */
938
} png_row_info;
939
940
typedef png_row_info FAR * png_row_infop;
941
typedef png_row_info FAR * FAR * png_row_infopp;
942
943
/* These are the function types for the I/O functions and for the functions
944
* that allow the user to override the default I/O functions with his or her
945
* own. The png_error_ptr type should match that of user-supplied warning
946
* and error functions, while the png_rw_ptr type should match that of the
947
* user read/write data functions.
948
*/
949
typedef struct png_struct_def png_struct;
950
typedef png_struct FAR * png_structp;
951
952
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
953
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
954
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
955
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
956
int));
957
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
958
int));
959
960
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
961
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
962
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
963
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
964
png_uint_32, int));
965
#endif
966
967
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
968
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
969
defined(PNG_LEGACY_SUPPORTED)
970
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
971
png_row_infop, png_bytep));
972
#endif
973
974
#if defined(PNG_USER_CHUNKS_SUPPORTED)
975
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
976
#endif
977
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
978
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
979
#endif
980
981
/* Transform masks for the high-level interface */
982
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
983
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
984
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
985
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
986
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
987
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
988
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
989
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
990
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
991
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
992
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
993
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
994
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
995
996
/* Flags for MNG supported features */
997
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
998
#define PNG_FLAG_MNG_FILTER_64 0x04
999
#define PNG_ALL_MNG_FEATURES 0x05
1000
1001
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1002
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1003
1004
/* The structure that holds the information to read and write PNG files.
1005
* The only people who need to care about what is inside of this are the
1006
* people who will be modifying the library for their own special needs.
1007
* It should NOT be accessed directly by an application, except to store
1008
* the jmp_buf.
1009
*/
1010
1011
struct png_struct_def
1012
{
1013
#ifdef PNG_SETJMP_SUPPORTED
1014
jmp_buf jmpbuf; /* used in png_error */
1015
#endif
1016
png_error_ptr error_fn; /* function for printing errors and aborting */
1017
png_error_ptr warning_fn; /* function for printing warnings */
1018
png_voidp error_ptr; /* user supplied struct for error functions */
1019
png_rw_ptr write_data_fn; /* function for writing output data */
1020
png_rw_ptr read_data_fn; /* function for reading input data */
1021
png_voidp io_ptr; /* ptr to application struct for I/O functions */
1022
1023
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1024
png_user_transform_ptr read_user_transform_fn; /* user read transform */
1025
#endif
1026
1027
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1028
png_user_transform_ptr write_user_transform_fn; /* user write transform */
1029
#endif
1030
1031
/* These were added in libpng-1.0.2 */
1032
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1033
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1034
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1035
png_voidp user_transform_ptr; /* user supplied struct for user transform */
1036
png_byte user_transform_depth; /* bit depth of user transformed pixels */
1037
png_byte user_transform_channels; /* channels in user transformed pixels */
1038
#endif
1039
#endif
1040
1041
png_uint_32 mode; /* tells us where we are in the PNG file */
1042
png_uint_32 flags; /* flags indicating various things to libpng */
1043
png_uint_32 transformations; /* which transformations to perform */
1044
1045
z_stream zstream; /* pointer to decompression structure (below) */
1046
png_bytep zbuf; /* buffer for zlib */
1047
png_size_t zbuf_size; /* size of zbuf */
1048
int zlib_level; /* holds zlib compression level */
1049
int zlib_method; /* holds zlib compression method */
1050
int zlib_window_bits; /* holds zlib compression window bits */
1051
int zlib_mem_level; /* holds zlib compression memory level */
1052
int zlib_strategy; /* holds zlib compression strategy */
1053
1054
png_uint_32 width; /* width of image in pixels */
1055
png_uint_32 height; /* height of image in pixels */
1056
png_uint_32 num_rows; /* number of rows in current pass */
1057
png_uint_32 usr_width; /* width of row at start of write */
1058
png_uint_32 rowbytes; /* size of row in bytes */
1059
png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1060
png_uint_32 iwidth; /* width of current interlaced row in pixels */
1061
png_uint_32 row_number; /* current row in interlace pass */
1062
png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1063
png_bytep row_buf; /* buffer to save current (unfiltered) row */
1064
png_bytep sub_row; /* buffer to save "sub" row when filtering */
1065
png_bytep up_row; /* buffer to save "up" row when filtering */
1066
png_bytep avg_row; /* buffer to save "avg" row when filtering */
1067
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1068
png_row_info row_info; /* used for transformation routines */
1069
1070
png_uint_32 idat_size; /* current IDAT size for read */
1071
png_uint_32 crc; /* current chunk CRC value */
1072
png_colorp palette; /* palette from the input file */
1073
png_uint_16 num_palette; /* number of color entries in palette */
1074
png_uint_16 num_trans; /* number of transparency values */
1075
png_byte chunk_name[5]; /* null-terminated name of current chunk */
1076
png_byte compression; /* file compression type (always 0) */
1077
png_byte filter; /* file filter type (always 0) */
1078
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1079
png_byte pass; /* current interlace pass (0 - 6) */
1080
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1081
png_byte color_type; /* color type of file */
1082
png_byte bit_depth; /* bit depth of file */
1083
png_byte usr_bit_depth; /* bit depth of users row */
1084
png_byte pixel_depth; /* number of bits per pixel */
1085
png_byte channels; /* number of channels in file */
1086
png_byte usr_channels; /* channels at start of write */
1087
png_byte sig_bytes; /* magic bytes read/written from start of file */
1088
1089
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1090
#ifdef PNG_LEGACY_SUPPORTED
1091
png_byte filler; /* filler byte for pixel expansion */
1092
#else
1093
png_uint_16 filler; /* filler bytes for pixel expansion */
1094
#endif
1095
#endif
1096
1097
#if defined(PNG_bKGD_SUPPORTED)
1098
png_byte background_gamma_type;
1099
# ifdef PNG_FLOATING_POINT_SUPPORTED
1100
float background_gamma;
1101
# endif
1102
png_color_16 background; /* background color in screen gamma space */
1103
#if defined(PNG_READ_GAMMA_SUPPORTED)
1104
png_color_16 background_1; /* background normalized to gamma 1.0 */
1105
#endif
1106
#endif /* PNG_bKGD_SUPPORTED */
1107
1108
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1109
png_flush_ptr output_flush_fn;/* Function for flushing output */
1110
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1111
png_uint_32 flush_rows; /* number of rows written since last flush */
1112
#endif
1113
1114
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1115
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1116
#ifdef PNG_FLOATING_POINT_SUPPORTED
1117
float gamma; /* file gamma value */
1118
float screen_gamma; /* screen gamma value (display_exponent) */
1119
#endif
1120
#endif
1121
1122
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1123
png_bytep gamma_table; /* gamma table for 8-bit depth files */
1124
png_bytep gamma_from_1; /* converts from 1.0 to screen */
1125
png_bytep gamma_to_1; /* converts from file to 1.0 */
1126
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1127
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1128
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1129
#endif
1130
1131
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1132
png_color_8 sig_bit; /* significant bits in each available channel */
1133
#endif
1134
1135
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1136
png_color_8 shift; /* shift for significant bit tranformation */
1137
#endif
1138
1139
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1140
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1141
png_bytep trans; /* transparency values for paletted files */
1142
png_color_16 trans_values; /* transparency values for non-paletted files */
1143
#endif
1144
1145
png_read_status_ptr read_row_fn; /* called after each row is decoded */
1146
png_write_status_ptr write_row_fn; /* called after each row is encoded */
1147
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1148
png_progressive_info_ptr info_fn; /* called after header data fully read */
1149
png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1150
png_progressive_end_ptr end_fn; /* called after image is complete */
1151
png_bytep save_buffer_ptr; /* current location in save_buffer */
1152
png_bytep save_buffer; /* buffer for previously read data */
1153
png_bytep current_buffer_ptr; /* current location in current_buffer */
1154
png_bytep current_buffer; /* buffer for recently used data */
1155
png_uint_32 push_length; /* size of current input chunk */
1156
png_uint_32 skip_length; /* bytes to skip in input data */
1157
png_size_t save_buffer_size; /* amount of data now in save_buffer */
1158
png_size_t save_buffer_max; /* total size of save_buffer */
1159
png_size_t buffer_size; /* total amount of available input data */
1160
png_size_t current_buffer_size; /* amount of data now in current_buffer */
1161
int process_mode; /* what push library is currently doing */
1162
int cur_palette; /* current push library palette index */
1163
1164
# if defined(PNG_TEXT_SUPPORTED)
1165
png_size_t current_text_size; /* current size of text input data */
1166
png_size_t current_text_left; /* how much text left to read in input */
1167
png_charp current_text; /* current text chunk buffer */
1168
png_charp current_text_ptr; /* current location in current_text */
1169
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
1170
1171
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1172
1173
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1174
/* for the Borland special 64K segment handler */
1175
png_bytepp offset_table_ptr;
1176
png_bytep offset_table;
1177
png_uint_16 offset_table_number;
1178
png_uint_16 offset_table_count;
1179
png_uint_16 offset_table_count_free;
1180
#endif
1181
1182
#if defined(PNG_READ_DITHER_SUPPORTED)
1183
png_bytep palette_lookup; /* lookup table for dithering */
1184
png_bytep dither_index; /* index translation for palette files */
1185
#endif
1186
1187
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1188
png_uint_16p hist; /* histogram */
1189
#endif
1190
1191
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1192
png_byte heuristic_method; /* heuristic for row filter selection */
1193
png_byte num_prev_filters; /* number of weights for previous rows */
1194
png_bytep prev_filters; /* filter type(s) of previous row(s) */
1195
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1196
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1197
png_uint_16p filter_costs; /* relative filter calculation cost */
1198
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1199
#endif
1200
1201
#if defined(PNG_TIME_RFC1123_SUPPORTED)
1202
png_charp time_buffer; /* String to hold RFC 1123 time text */
1203
#endif
1204
1205
/* New members added in libpng-1.0.6 */
1206
1207
#ifdef PNG_FREE_ME_SUPPORTED
1208
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1209
#endif
1210
1211
#if defined(PNG_USER_CHUNKS_SUPPORTED)
1212
png_voidp user_chunk_ptr;
1213
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1214
#endif
1215
1216
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1217
int num_chunk_list;
1218
png_bytep chunk_list;
1219
#endif
1220
1221
/* New members added in libpng-1.0.3 */
1222
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1223
png_byte rgb_to_gray_status;
1224
/* These were changed from png_byte in libpng-1.0.6 */
1225
png_uint_16 rgb_to_gray_red_coeff;
1226
png_uint_16 rgb_to_gray_green_coeff;
1227
png_uint_16 rgb_to_gray_blue_coeff;
1228
#endif
1229
1230
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1231
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1232
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1233
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1234
/* changed from png_byte to png_uint_32 at version 1.2.0 */
1235
#ifdef PNG_1_0_X
1236
png_byte mng_features_permitted;
1237
#else
1238
png_uint_32 mng_features_permitted;
1239
#endif /* PNG_1_0_X */
1240
#endif
1241
1242
/* New member added in libpng-1.0.7 */
1243
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1244
png_fixed_point int_gamma;
1245
#endif
1246
1247
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1248
#if defined(PNG_MNG_FEATURES_SUPPORTED)
1249
png_byte filter_type;
1250
#endif
1251
1252
#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
1253
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1254
png_uint_32 row_buf_size;
1255
#endif
1256
1257
/* New members added in libpng-1.2.0 */
1258
#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1259
png_byte mmx_bitdepth_threshold;
1260
png_uint_32 mmx_rowbytes_threshold;
1261
png_uint_32 asm_flags;
1262
#endif
1263
1264
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1265
#ifdef PNG_USER_MEM_SUPPORTED
1266
png_voidp mem_ptr; /* user supplied struct for mem functions */
1267
png_malloc_ptr malloc_fn; /* function for allocating memory */
1268
png_free_ptr free_fn; /* function for freeing memory */
1269
#endif
1270
1271
/* New member added in libpng-1.0.13 and 1.2.0 */
1272
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1273
1274
#if defined(PNG_READ_DITHER_SUPPORTED)
1275
/* The following three members were added at version 1.0.14 and 1.2.4 */
1276
png_bytep dither_sort; /* working sort array */
1277
png_bytep index_to_palette; /* where the original index currently is */
1278
/* in the palette */
1279
png_bytep palette_to_index; /* which original index points to this */
1280
/* palette color */
1281
#endif
1282
1283
};
1284
1285
1286
/* This prevents a compiler error in png.c if png.c and png.h are both at
1287
version 1.2.5
1288
*/
1289
typedef png_structp version_1_2_5;
1290
1291
typedef png_struct FAR * FAR * png_structpp;
1292
1293
/* Here are the function definitions most commonly used. This is not
1294
* the place to find out how to use libpng. See libpng.txt for the
1295
* full explanation, see example.c for the summary. This just provides
1296
* a simple one line description of the use of each function.
1297
*/
1298
1299
/* Returns the version number of the library */
1300
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1301
1302
/* Tell lib we have already handled the first <num_bytes> magic bytes.
1303
* Handling more than 8 bytes from the beginning of the file is an error.
1304
*/
1305
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1306
int num_bytes));
1307
1308
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1309
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1310
* signature, and non-zero otherwise. Having num_to_check == 0 or
1311
* start > 7 will always fail (ie return non-zero).
1312
*/
1313
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1314
png_size_t num_to_check));
1315
1316
/* Simple signature checking function. This is the same as calling
1317
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1318
*/
1319
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1320
1321
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1322
extern PNG_EXPORT(png_structp,png_create_read_struct)
1323
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1324
png_error_ptr error_fn, png_error_ptr warn_fn));
1325
1326
/* Allocate and initialize png_ptr struct for writing, and any other memory */
1327
extern PNG_EXPORT(png_structp,png_create_write_struct)
1328
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1329
png_error_ptr error_fn, png_error_ptr warn_fn));
1330
1331
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1332
PNGARG((png_structp png_ptr));
1333
1334
extern PNG_EXPORT(void,png_set_compression_buffer_size)
1335
PNGARG((png_structp png_ptr, png_uint_32 size));
1336
1337
/* Reset the compression stream */
1338
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1339
1340
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1341
#ifdef PNG_USER_MEM_SUPPORTED
1342
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1343
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1344
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1345
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1346
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1347
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1348
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1349
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1350
#endif
1351
1352
/* Write a PNG chunk - size, type, (optional) data, CRC. */
1353
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1354
png_bytep chunk_name, png_bytep data, png_size_t length));
1355
1356
/* Write the start of a PNG chunk - length and chunk name. */
1357
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1358
png_bytep chunk_name, png_uint_32 length));
1359
1360
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1361
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1362
png_bytep data, png_size_t length));
1363
1364
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1365
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1366
1367
/* Allocate and initialize the info structure */
1368
extern PNG_EXPORT(png_infop,png_create_info_struct)
1369
PNGARG((png_structp png_ptr));
1370
1371
/* Initialize the info structure (old interface - DEPRECATED) */
1372
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1373
#undef png_info_init
1374
#define png_info_init(info_ptr) png_info_init_3(&info_ptr, sizeof(png_info));
1375
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1376
png_size_t png_info_struct_size));
1377
1378
/* Writes all the PNG information before the image. */
1379
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1380
png_infop info_ptr));
1381
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1382
png_infop info_ptr));
1383
1384
/* read the information before the actual image data. */
1385
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1386
png_infop info_ptr));
1387
1388
#if defined(PNG_TIME_RFC1123_SUPPORTED)
1389
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1390
PNGARG((png_structp png_ptr, png_timep ptime));
1391
#endif
1392
1393
#if !defined(_WIN32_WCE)
1394
/* "time.h" functions are not supported on WindowsCE */
1395
#if defined(PNG_WRITE_tIME_SUPPORTED)
1396
/* convert from a struct tm to png_time */
1397
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1398
struct tm FAR * ttime));
1399
1400
/* convert from time_t to png_time. Uses gmtime() */
1401
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1402
time_t ttime));
1403
#endif /* PNG_WRITE_tIME_SUPPORTED */
1404
#endif /* _WIN32_WCE */
1405
1406
#if defined(PNG_READ_EXPAND_SUPPORTED)
1407
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1408
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1409
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1410
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1411
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1412
#endif
1413
1414
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1415
/* Use blue, green, red order for pixels. */
1416
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1417
#endif
1418
1419
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1420
/* Expand the grayscale to 24-bit RGB if necessary. */
1421
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1422
#endif
1423
1424
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1425
/* Reduce RGB to grayscale. */
1426
#ifdef PNG_FLOATING_POINT_SUPPORTED
1427
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1428
int error_action, double red, double green ));
1429
#endif
1430
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1431
int error_action, png_fixed_point red, png_fixed_point green ));
1432
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1433
png_ptr));
1434
#endif
1435
1436
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1437
png_colorp palette));
1438
1439
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1440
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1441
#endif
1442
1443
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1444
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1445
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1446
#endif
1447
1448
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1449
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1450
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1451
#endif
1452
1453
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1454
/* Add a filler byte to 24-bit RGB images. */
1455
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1456
png_uint_32 filler, int flags));
1457
/* The values of the PNG_FILLER_ defines should NOT be changed */
1458
#define PNG_FILLER_BEFORE 0
1459
#define PNG_FILLER_AFTER 1
1460
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1461
1462
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1463
/* Swap bytes in 16-bit depth files. */
1464
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1465
#endif
1466
1467
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1468
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1469
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1470
#endif
1471
1472
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1473
/* Swap packing order of pixels in bytes. */
1474
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1475
#endif
1476
1477
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1478
/* Converts files to legal bit depths. */
1479
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1480
png_color_8p true_bits));
1481
#endif
1482
1483
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1484
defined(PNG_WRITE_INTERLACING_SUPPORTED)
1485
/* Have the code handle the interlacing. Returns the number of passes. */
1486
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1487
#endif
1488
1489
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1490
/* Invert monochrome files */
1491
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1492
#endif
1493
1494
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
1495
/* Handle alpha and tRNS by replacing with a background color. */
1496
#ifdef PNG_FLOATING_POINT_SUPPORTED
1497
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1498
png_color_16p background_color, int background_gamma_code,
1499
int need_expand, double background_gamma));
1500
#endif
1501
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1502
#define PNG_BACKGROUND_GAMMA_SCREEN 1
1503
#define PNG_BACKGROUND_GAMMA_FILE 2
1504
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1505
#endif
1506
1507
#if defined(PNG_READ_16_TO_8_SUPPORTED)
1508
/* strip the second byte of information from a 16-bit depth file. */
1509
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1510
#endif
1511
1512
#if defined(PNG_READ_DITHER_SUPPORTED)
1513
/* Turn on dithering, and reduce the palette to the number of colors available. */
1514
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1515
png_colorp palette, int num_palette, int maximum_colors,
1516
png_uint_16p histogram, int full_dither));
1517
#endif
1518
1519
#if defined(PNG_READ_GAMMA_SUPPORTED)
1520
/* Handle gamma correction. Screen_gamma=(display_exponent) */
1521
#ifdef PNG_FLOATING_POINT_SUPPORTED
1522
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1523
double screen_gamma, double default_file_gamma));
1524
#endif
1525
#endif
1526
1527
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1528
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1529
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1530
/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1531
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1532
int empty_plte_permitted));
1533
#endif
1534
1535
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1536
/* Set how many lines between output flushes - 0 for no flushing */
1537
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1538
/* Flush the current PNG output buffer */
1539
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1540
#endif
1541
1542
/* optional update palette with requested transformations */
1543
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1544
1545
/* optional call to update the users info structure */
1546
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1547
png_infop info_ptr));
1548
1549
/* read one or more rows of image data. */
1550
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1551
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1552
1553
/* read a row of data. */
1554
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1555
png_bytep row,
1556
png_bytep display_row));
1557
1558
/* read the whole image into memory at once. */
1559
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1560
png_bytepp image));
1561
1562
/* write a row of image data */
1563
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1564
png_bytep row));
1565
1566
/* write a few rows of image data */
1567
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1568
png_bytepp row, png_uint_32 num_rows));
1569
1570
/* write the image data */
1571
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1572
png_bytepp image));
1573
1574
/* writes the end of the PNG file. */
1575
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1576
png_infop info_ptr));
1577
1578
/* read the end of the PNG file. */
1579
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1580
png_infop info_ptr));
1581
1582
/* free any memory associated with the png_info_struct */
1583
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1584
png_infopp info_ptr_ptr));
1585
1586
/* free any memory associated with the png_struct and the png_info_structs */
1587
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1588
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1589
1590
/* free all memory used by the read (old method - NOT DLL EXPORTED) */
1591
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1592
png_infop end_info_ptr));
1593
1594
/* free any memory associated with the png_struct and the png_info_structs */
1595
extern PNG_EXPORT(void,png_destroy_write_struct)
1596
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1597
1598
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1599
extern void png_write_destroy PNGARG((png_structp png_ptr));
1600
1601
/* set the libpng method of handling chunk CRC errors */
1602
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1603
int crit_action, int ancil_action));
1604
1605
/* Values for png_set_crc_action() to say how to handle CRC errors in
1606
* ancillary and critical chunks, and whether to use the data contained
1607
* therein. Note that it is impossible to "discard" data in a critical
1608
* chunk. For versions prior to 0.90, the action was always error/quit,
1609
* whereas in version 0.90 and later, the action for CRC errors in ancillary
1610
* chunks is warn/discard. These values should NOT be changed.
1611
*
1612
* value action:critical action:ancillary
1613
*/
1614
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1615
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1616
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1617
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1618
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1619
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1620
1621
/* These functions give the user control over the scan-line filtering in
1622
* libpng and the compression methods used by zlib. These functions are
1623
* mainly useful for testing, as the defaults should work with most users.
1624
* Those users who are tight on memory or want faster performance at the
1625
* expense of compression can modify them. See the compression library
1626
* header file (zlib.h) for an explination of the compression functions.
1627
*/
1628
1629
/* set the filtering method(s) used by libpng. Currently, the only valid
1630
* value for "method" is 0.
1631
*/
1632
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1633
int filters));
1634
1635
/* Flags for png_set_filter() to say which filters to use. The flags
1636
* are chosen so that they don't conflict with real filter types
1637
* below, in case they are supplied instead of the #defined constants.
1638
* These values should NOT be changed.
1639
*/
1640
#define PNG_NO_FILTERS 0x00
1641
#define PNG_FILTER_NONE 0x08
1642
#define PNG_FILTER_SUB 0x10
1643
#define PNG_FILTER_UP 0x20
1644
#define PNG_FILTER_AVG 0x40
1645
#define PNG_FILTER_PAETH 0x80
1646
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1647
PNG_FILTER_AVG | PNG_FILTER_PAETH)
1648
1649
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1650
* These defines should NOT be changed.
1651
*/
1652
#define PNG_FILTER_VALUE_NONE 0
1653
#define PNG_FILTER_VALUE_SUB 1
1654
#define PNG_FILTER_VALUE_UP 2
1655
#define PNG_FILTER_VALUE_AVG 3
1656
#define PNG_FILTER_VALUE_PAETH 4
1657
#define PNG_FILTER_VALUE_LAST 5
1658
1659
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1660
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1661
* defines, either the default (minimum-sum-of-absolute-differences), or
1662
* the experimental method (weighted-minimum-sum-of-absolute-differences).
1663
*
1664
* Weights are factors >= 1.0, indicating how important it is to keep the
1665
* filter type consistent between rows. Larger numbers mean the current
1666
* filter is that many times as likely to be the same as the "num_weights"
1667
* previous filters. This is cumulative for each previous row with a weight.
1668
* There needs to be "num_weights" values in "filter_weights", or it can be
1669
* NULL if the weights aren't being specified. Weights have no influence on
1670
* the selection of the first row filter. Well chosen weights can (in theory)
1671
* improve the compression for a given image.
1672
*
1673
* Costs are factors >= 1.0 indicating the relative decoding costs of a
1674
* filter type. Higher costs indicate more decoding expense, and are
1675
* therefore less likely to be selected over a filter with lower computational
1676
* costs. There needs to be a value in "filter_costs" for each valid filter
1677
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1678
* setting the costs. Costs try to improve the speed of decompression without
1679
* unduly increasing the compressed image size.
1680
*
1681
* A negative weight or cost indicates the default value is to be used, and
1682
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1683
* The default values for both weights and costs are currently 1.0, but may
1684
* change if good general weighting/cost heuristics can be found. If both
1685
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1686
* to the UNWEIGHTED method, but with added encoding time/computation.
1687
*/
1688
#ifdef PNG_FLOATING_POINT_SUPPORTED
1689
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1690
int heuristic_method, int num_weights, png_doublep filter_weights,
1691
png_doublep filter_costs));
1692
#endif
1693
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1694
1695
/* Heuristic used for row filter selection. These defines should NOT be
1696
* changed.
1697
*/
1698
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1699
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1700
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1701
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1702
1703
/* Set the library compression level. Currently, valid values range from
1704
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1705
* (0 - no compression, 9 - "maximal" compression). Note that tests have
1706
* shown that zlib compression levels 3-6 usually perform as well as level 9
1707
* for PNG images, and do considerably fewer caclulations. In the future,
1708
* these values may not correspond directly to the zlib compression levels.
1709
*/
1710
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1711
int level));
1712
1713
extern PNG_EXPORT(void,png_set_compression_mem_level)
1714
PNGARG((png_structp png_ptr, int mem_level));
1715
1716
extern PNG_EXPORT(void,png_set_compression_strategy)
1717
PNGARG((png_structp png_ptr, int strategy));
1718
1719
extern PNG_EXPORT(void,png_set_compression_window_bits)
1720
PNGARG((png_structp png_ptr, int window_bits));
1721
1722
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1723
int method));
1724
1725
/* These next functions are called for input/output, memory, and error
1726
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1727
* and call standard C I/O routines such as fread(), fwrite(), and
1728
* fprintf(). These functions can be made to use other I/O routines
1729
* at run time for those applications that need to handle I/O in a
1730
* different manner by calling png_set_???_fn(). See libpng.txt for
1731
* more information.
1732
*/
1733
1734
#if !defined(PNG_NO_STDIO)
1735
/* Initialize the input/output for the PNG file to the default functions. */
1736
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1737
#endif
1738
1739
/* Replace the (error and abort), and warning functions with user
1740
* supplied functions. If no messages are to be printed you must still
1741
* write and use replacement functions. The replacement error_fn should
1742
* still do a longjmp to the last setjmp location if you are using this
1743
* method of error handling. If error_fn or warning_fn is NULL, the
1744
* default function will be used.
1745
*/
1746
1747
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1748
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1749
1750
/* Return the user pointer associated with the error functions */
1751
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1752
1753
/* Replace the default data output functions with a user supplied one(s).
1754
* If buffered output is not used, then output_flush_fn can be set to NULL.
1755
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1756
* output_flush_fn will be ignored (and thus can be NULL).
1757
*/
1758
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1759
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1760
1761
/* Replace the default data input function with a user supplied one. */
1762
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1763
png_voidp io_ptr, png_rw_ptr read_data_fn));
1764
1765
/* Return the user pointer associated with the I/O functions */
1766
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1767
1768
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1769
png_read_status_ptr read_row_fn));
1770
1771
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1772
png_write_status_ptr write_row_fn));
1773
1774
#ifdef PNG_USER_MEM_SUPPORTED
1775
/* Replace the default memory allocation functions with user supplied one(s). */
1776
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1777
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1778
/* Return the user pointer associated with the memory functions */
1779
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
1780
#endif
1781
1782
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1783
defined(PNG_LEGACY_SUPPORTED)
1784
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
1785
png_ptr, png_user_transform_ptr read_user_transform_fn));
1786
#endif
1787
1788
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1789
defined(PNG_LEGACY_SUPPORTED)
1790
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
1791
png_ptr, png_user_transform_ptr write_user_transform_fn));
1792
#endif
1793
1794
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1795
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1796
defined(PNG_LEGACY_SUPPORTED)
1797
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
1798
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
1799
int user_transform_channels));
1800
/* Return the user pointer associated with the user transform functions */
1801
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
1802
PNGARG((png_structp png_ptr));
1803
#endif
1804
1805
#ifdef PNG_USER_CHUNKS_SUPPORTED
1806
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
1807
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
1808
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
1809
png_ptr));
1810
#endif
1811
1812
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1813
/* Sets the function callbacks for the push reader, and a pointer to a
1814
* user-defined structure available to the callback functions.
1815
*/
1816
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
1817
png_voidp progressive_ptr,
1818
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1819
png_progressive_end_ptr end_fn));
1820
1821
/* returns the user pointer associated with the push read functions */
1822
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
1823
PNGARG((png_structp png_ptr));
1824
1825
/* function to be called when data becomes available */
1826
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
1827
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
1828
1829
/* function that combines rows. Not very much different than the
1830
* png_combine_row() call. Is this even used?????
1831
*/
1832
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
1833
png_bytep old_row, png_bytep new_row));
1834
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1835
1836
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
1837
png_uint_32 size));
1838
1839
#if defined(PNG_1_0_X)
1840
# define png_malloc_warn png_malloc
1841
#else
1842
/* Added at libpng version 1.2.4 */
1843
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
1844
png_uint_32 size));
1845
#endif
1846
1847
/* frees a pointer allocated by png_malloc() */
1848
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
1849
1850
#if defined(PNG_1_0_X)
1851
/* Function to allocate memory for zlib. */
1852
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
1853
uInt size));
1854
1855
/* Function to free memory for zlib */
1856
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
1857
#endif
1858
1859
/* Free data that was allocated internally */
1860
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
1861
png_infop info_ptr, png_uint_32 free_me, int num));
1862
#ifdef PNG_FREE_ME_SUPPORTED
1863
/* Reassign responsibility for freeing existing data, whether allocated
1864
* by libpng or by the application */
1865
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
1866
png_infop info_ptr, int freer, png_uint_32 mask));
1867
#endif
1868
/* assignments for png_data_freer */
1869
#define PNG_DESTROY_WILL_FREE_DATA 1
1870
#define PNG_SET_WILL_FREE_DATA 1
1871
#define PNG_USER_WILL_FREE_DATA 2
1872
/* Flags for png_ptr->free_me and info_ptr->free_me */
1873
#define PNG_FREE_HIST 0x0008
1874
#define PNG_FREE_ICCP 0x0010
1875
#define PNG_FREE_SPLT 0x0020
1876
#define PNG_FREE_ROWS 0x0040
1877
#define PNG_FREE_PCAL 0x0080
1878
#define PNG_FREE_SCAL 0x0100
1879
#define PNG_FREE_UNKN 0x0200
1880
#define PNG_FREE_LIST 0x0400
1881
#define PNG_FREE_PLTE 0x1000
1882
#define PNG_FREE_TRNS 0x2000
1883
#define PNG_FREE_TEXT 0x4000
1884
#define PNG_FREE_ALL 0x7fff
1885
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
1886
1887
#ifdef PNG_USER_MEM_SUPPORTED
1888
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
1889
png_uint_32 size));
1890
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
1891
png_voidp ptr));
1892
#endif
1893
1894
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
1895
png_voidp s1, png_voidp s2, png_uint_32 size));
1896
1897
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
1898
png_voidp s1, int value, png_uint_32 size));
1899
1900
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
1901
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
1902
int check));
1903
#endif /* USE_FAR_KEYWORD */
1904
1905
/* Fatal error in PNG image of libpng - can't continue */
1906
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
1907
png_const_charp error_message));
1908
1909
/* The same, but the chunk name is prepended to the error string. */
1910
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
1911
png_const_charp error_message));
1912
1913
/* Non-fatal error in libpng. Can continue, but may have a problem. */
1914
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
1915
png_const_charp warning_message));
1916
1917
/* Non-fatal error in libpng, chunk name is prepended to message. */
1918
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
1919
png_const_charp warning_message));
1920
1921
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
1922
* Similarly, the png_get_<chunk> calls are used to read values from the
1923
* png_info_struct, either storing the parameters in the passed variables, or
1924
* setting pointers into the png_info_struct where the data is stored. The
1925
* png_get_<chunk> functions return a non-zero value if the data was available
1926
* in info_ptr, or return zero and do not change any of the parameters if the
1927
* data was not available.
1928
*
1929
* These functions should be used instead of directly accessing png_info
1930
* to avoid problems with future changes in the size and internal layout of
1931
* png_info_struct.
1932
*/
1933
/* Returns "flag" if chunk data is valid in info_ptr. */
1934
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
1935
png_infop info_ptr, png_uint_32 flag));
1936
1937
/* Returns number of bytes needed to hold a transformed row. */
1938
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
1939
png_infop info_ptr));
1940
1941
#if defined(PNG_INFO_IMAGE_SUPPORTED)
1942
/* Returns row_pointers, which is an array of pointers to scanlines that was
1943
returned from png_read_png(). */
1944
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
1945
png_infop info_ptr));
1946
/* Set row_pointers, which is an array of pointers to scanlines for use
1947
by png_write_png(). */
1948
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
1949
png_infop info_ptr, png_bytepp row_pointers));
1950
#endif
1951
1952
/* Returns number of color channels in image. */
1953
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
1954
png_infop info_ptr));
1955
1956
#ifdef PNG_EASY_ACCESS_SUPPORTED
1957
/* Returns image width in pixels. */
1958
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
1959
png_ptr, png_infop info_ptr));
1960
1961
/* Returns image height in pixels. */
1962
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
1963
png_ptr, png_infop info_ptr));
1964
1965
/* Returns image bit_depth. */
1966
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
1967
png_ptr, png_infop info_ptr));
1968
1969
/* Returns image color_type. */
1970
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
1971
png_ptr, png_infop info_ptr));
1972
1973
/* Returns image filter_type. */
1974
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
1975
png_ptr, png_infop info_ptr));
1976
1977
/* Returns image interlace_type. */
1978
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
1979
png_ptr, png_infop info_ptr));
1980
1981
/* Returns image compression_type. */
1982
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
1983
png_ptr, png_infop info_ptr));
1984
1985
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
1986
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
1987
png_ptr, png_infop info_ptr));
1988
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
1989
png_ptr, png_infop info_ptr));
1990
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
1991
png_ptr, png_infop info_ptr));
1992
1993
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
1994
#ifdef PNG_FLOATING_POINT_SUPPORTED
1995
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
1996
png_ptr, png_infop info_ptr));
1997
#endif
1998
1999
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2000
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2001
png_ptr, png_infop info_ptr));
2002
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2003
png_ptr, png_infop info_ptr));
2004
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2005
png_ptr, png_infop info_ptr));
2006
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2007
png_ptr, png_infop info_ptr));
2008
2009
#endif /* PNG_EASY_ACCESS_SUPPORTED */
2010
2011
/* Returns pointer to signature string read from PNG header */
2012
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2013
png_infop info_ptr));
2014
2015
#if defined(PNG_bKGD_SUPPORTED)
2016
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2017
png_infop info_ptr, png_color_16p *background));
2018
#endif
2019
2020
#if defined(PNG_bKGD_SUPPORTED)
2021
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2022
png_infop info_ptr, png_color_16p background));
2023
#endif
2024
2025
#if defined(PNG_cHRM_SUPPORTED)
2026
#ifdef PNG_FLOATING_POINT_SUPPORTED
2027
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2028
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2029
double *red_y, double *green_x, double *green_y, double *blue_x,
2030
double *blue_y));
2031
#endif
2032
#ifdef PNG_FIXED_POINT_SUPPORTED
2033
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2034
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2035
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2036
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2037
*int_blue_x, png_fixed_point *int_blue_y));
2038
#endif
2039
#endif
2040
2041
#if defined(PNG_cHRM_SUPPORTED)
2042
#ifdef PNG_FLOATING_POINT_SUPPORTED
2043
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2044
png_infop info_ptr, double white_x, double white_y, double red_x,
2045
double red_y, double green_x, double green_y, double blue_x, double blue_y));
2046
#endif
2047
#ifdef PNG_FIXED_POINT_SUPPORTED
2048
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2049
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2050
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2051
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2052
png_fixed_point int_blue_y));
2053
#endif
2054
#endif
2055
2056
#if defined(PNG_gAMA_SUPPORTED)
2057
#ifdef PNG_FLOATING_POINT_SUPPORTED
2058
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2059
png_infop info_ptr, double *file_gamma));
2060
#endif
2061
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2062
png_infop info_ptr, png_fixed_point *int_file_gamma));
2063
#endif
2064
2065
#if defined(PNG_gAMA_SUPPORTED)
2066
#ifdef PNG_FLOATING_POINT_SUPPORTED
2067
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2068
png_infop info_ptr, double file_gamma));
2069
#endif
2070
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2071
png_infop info_ptr, png_fixed_point int_file_gamma));
2072
#endif
2073
2074
#if defined(PNG_hIST_SUPPORTED)
2075
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2076
png_infop info_ptr, png_uint_16p *hist));
2077
#endif
2078
2079
#if defined(PNG_hIST_SUPPORTED)
2080
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2081
png_infop info_ptr, png_uint_16p hist));
2082
#endif
2083
2084
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2085
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2086
int *bit_depth, int *color_type, int *interlace_method,
2087
int *compression_method, int *filter_method));
2088
2089
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2090
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2091
int color_type, int interlace_method, int compression_method,
2092
int filter_method));
2093
2094
#if defined(PNG_oFFs_SUPPORTED)
2095
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2096
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2097
int *unit_type));
2098
#endif
2099
2100
#if defined(PNG_oFFs_SUPPORTED)
2101
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2102
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2103
int unit_type));
2104
#endif
2105
2106
#if defined(PNG_pCAL_SUPPORTED)
2107
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2108
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2109
int *type, int *nparams, png_charp *units, png_charpp *params));
2110
#endif
2111
2112
#if defined(PNG_pCAL_SUPPORTED)
2113
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2114
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2115
int type, int nparams, png_charp units, png_charpp params));
2116
#endif
2117
2118
#if defined(PNG_pHYs_SUPPORTED)
2119
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2120
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2121
#endif
2122
2123
#if defined(PNG_pHYs_SUPPORTED)
2124
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2125
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2126
#endif
2127
2128
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2129
png_infop info_ptr, png_colorp *palette, int *num_palette));
2130
2131
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2132
png_infop info_ptr, png_colorp palette, int num_palette));
2133
2134
#if defined(PNG_sBIT_SUPPORTED)
2135
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2136
png_infop info_ptr, png_color_8p *sig_bit));
2137
#endif
2138
2139
#if defined(PNG_sBIT_SUPPORTED)
2140
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2141
png_infop info_ptr, png_color_8p sig_bit));
2142
#endif
2143
2144
#if defined(PNG_sRGB_SUPPORTED)
2145
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2146
png_infop info_ptr, int *intent));
2147
#endif
2148
2149
#if defined(PNG_sRGB_SUPPORTED)
2150
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2151
png_infop info_ptr, int intent));
2152
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2153
png_infop info_ptr, int intent));
2154
#endif
2155
2156
#if defined(PNG_iCCP_SUPPORTED)
2157
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2158
png_infop info_ptr, png_charpp name, int *compression_type,
2159
png_charpp profile, png_uint_32 *proflen));
2160
/* Note to maintainer: profile should be png_bytepp */
2161
#endif
2162
2163
#if defined(PNG_iCCP_SUPPORTED)
2164
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2165
png_infop info_ptr, png_charp name, int compression_type,
2166
png_charp profile, png_uint_32 proflen));
2167
/* Note to maintainer: profile should be png_bytep */
2168
#endif
2169
2170
#if defined(PNG_sPLT_SUPPORTED)
2171
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2172
png_infop info_ptr, png_sPLT_tpp entries));
2173
#endif
2174
2175
#if defined(PNG_sPLT_SUPPORTED)
2176
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2177
png_infop info_ptr, png_sPLT_tp entries, int nentries));
2178
#endif
2179
2180
#if defined(PNG_TEXT_SUPPORTED)
2181
/* png_get_text also returns the number of text chunks in *num_text */
2182
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2183
png_infop info_ptr, png_textp *text_ptr, int *num_text));
2184
#endif
2185
2186
/*
2187
* Note while png_set_text() will accept a structure whose text,
2188
* language, and translated keywords are NULL pointers, the structure
2189
* returned by png_get_text will always contain regular
2190
* zero-terminated C strings. They might be empty strings but
2191
* they will never be NULL pointers.
2192
*/
2193
2194
#if defined(PNG_TEXT_SUPPORTED)
2195
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2196
png_infop info_ptr, png_textp text_ptr, int num_text));
2197
#endif
2198
2199
#if defined(PNG_tIME_SUPPORTED)
2200
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2201
png_infop info_ptr, png_timep *mod_time));
2202
#endif
2203
2204
#if defined(PNG_tIME_SUPPORTED)
2205
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2206
png_infop info_ptr, png_timep mod_time));
2207
#endif
2208
2209
#if defined(PNG_tRNS_SUPPORTED)
2210
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2211
png_infop info_ptr, png_bytep *trans, int *num_trans,
2212
png_color_16p *trans_values));
2213
#endif
2214
2215
#if defined(PNG_tRNS_SUPPORTED)
2216
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2217
png_infop info_ptr, png_bytep trans, int num_trans,
2218
png_color_16p trans_values));
2219
#endif
2220
2221
#if defined(PNG_tRNS_SUPPORTED)
2222
#endif
2223
2224
#if defined(PNG_sCAL_SUPPORTED)
2225
#ifdef PNG_FLOATING_POINT_SUPPORTED
2226
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2227
png_infop info_ptr, int *unit, double *width, double *height));
2228
#else
2229
#ifdef PNG_FIXED_POINT_SUPPORTED
2230
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2231
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2232
#endif
2233
#endif
2234
#endif /* PNG_sCAL_SUPPORTED */
2235
2236
#if defined(PNG_sCAL_SUPPORTED)
2237
#ifdef PNG_FLOATING_POINT_SUPPORTED
2238
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2239
png_infop info_ptr, int unit, double width, double height));
2240
#endif
2241
#ifdef PNG_FIXED_POINT_SUPPORTED
2242
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2243
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2244
#endif
2245
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2246
2247
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2248
/* provide a list of chunks and how they are to be handled, if the built-in
2249
handling or default unknown chunk handling is not desired. Any chunks not
2250
listed will be handled in the default manner. The IHDR and IEND chunks
2251
must not be listed.
2252
keep = 0: follow default behavour
2253
= 1: do not keep
2254
= 2: keep only if safe-to-copy
2255
= 3: keep even if unsafe-to-copy
2256
*/
2257
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2258
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2259
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2260
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2261
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2262
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2263
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2264
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2265
#endif
2266
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2267
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2268
chunk_name));
2269
#endif
2270
2271
/* Png_free_data() will turn off the "valid" flag for anything it frees.
2272
If you need to turn it off for a chunk that your application has freed,
2273
you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2274
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2275
png_infop info_ptr, int mask));
2276
2277
#if defined(PNG_INFO_IMAGE_SUPPORTED)
2278
/* The "params" pointer is currently not used and is for future expansion. */
2279
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2280
png_infop info_ptr,
2281
int transforms,
2282
png_voidp params));
2283
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2284
png_infop info_ptr,
2285
int transforms,
2286
png_voidp params));
2287
#endif
2288
2289
/* Define PNG_DEBUG at compile time for debugging information. Higher
2290
* numbers for PNG_DEBUG mean more debugging information. This has
2291
* only been added since version 0.95 so it is not implemented throughout
2292
* libpng yet, but more support will be added as needed.
2293
*/
2294
#ifdef PNG_DEBUG
2295
#if (PNG_DEBUG > 0)
2296
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2297
#include <crtdbg.h>
2298
#if (PNG_DEBUG > 1)
2299
#define png_debug(l,m) _RPT0(_CRT_WARN,m)
2300
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2301
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2302
#endif
2303
#else /* PNG_DEBUG_FILE || !_MSC_VER */
2304
#ifndef PNG_DEBUG_FILE
2305
#define PNG_DEBUG_FILE stderr
2306
#endif /* PNG_DEBUG_FILE */
2307
#if (PNG_DEBUG > 1)
2308
#define png_debug(l,m) \
2309
{ \
2310
int num_tabs=l; \
2311
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2312
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2313
}
2314
#define png_debug1(l,m,p1) \
2315
{ \
2316
int num_tabs=l; \
2317
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2318
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2319
}
2320
#define png_debug2(l,m,p1,p2) \
2321
{ \
2322
int num_tabs=l; \
2323
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2324
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2325
}
2326
#endif /* (PNG_DEBUG > 1) */
2327
#endif /* _MSC_VER */
2328
#endif /* (PNG_DEBUG > 0) */
2329
#endif /* PNG_DEBUG */
2330
#ifndef png_debug
2331
#define png_debug(l, m)
2332
#endif
2333
#ifndef png_debug1
2334
#define png_debug1(l, m, p1)
2335
#endif
2336
#ifndef png_debug2
2337
#define png_debug2(l, m, p1, p2)
2338
#endif
2339
2340
extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
2341
2342
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2343
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2344
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2345
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2346
2347
#ifdef PNG_MNG_FEATURES_SUPPORTED
2348
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2349
png_ptr, png_uint_32 mng_features_permitted));
2350
#endif
2351
2352
/* Added to version 1.2.0 */
2353
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2354
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2355
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2356
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2357
#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2358
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2359
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2360
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2361
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2362
#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2363
2364
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2365
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
2366
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2367
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2368
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2369
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2370
#define PNG_MMX_WRITE_FLAGS ( 0 )
2371
2372
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2373
| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2374
| PNG_MMX_READ_FLAGS \
2375
| PNG_MMX_WRITE_FLAGS )
2376
2377
#define PNG_SELECT_READ 1
2378
#define PNG_SELECT_WRITE 2
2379
2380
2381
#if !defined(PNG_1_0_X)
2382
/* pngget.c */
2383
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2384
PNGARG((int flag_select, int *compilerID));
2385
2386
/* pngget.c */
2387
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2388
PNGARG((int flag_select));
2389
2390
/* pngget.c */
2391
extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2392
PNGARG((png_structp png_ptr));
2393
2394
/* pngget.c */
2395
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2396
PNGARG((png_structp png_ptr));
2397
2398
/* pngget.c */
2399
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2400
PNGARG((png_structp png_ptr));
2401
2402
/* pngset.c */
2403
extern PNG_EXPORT(void,png_set_asm_flags)
2404
PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2405
2406
/* pngset.c */
2407
extern PNG_EXPORT(void,png_set_mmx_thresholds)
2408
PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2409
png_uint_32 mmx_rowbytes_threshold));
2410
2411
#endif /* PNG_1_0_X */
2412
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2413
2414
#if !defined(PNG_1_0_X)
2415
/* png.c, pnggccrd.c, or pngvcrd.c */
2416
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2417
2418
/* Strip the prepended error numbers ("#nnn ") from error and warning
2419
* messages before passing them to the error or warning handler. */
2420
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2421
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2422
png_ptr, png_uint_32 strip_mode));
2423
#endif
2424
#endif /* PNG_1_0_X */
2425
2426
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2427
2428
#define PNG_HEADER_VERSION_STRING \
2429
" libpng version 1.2.5 - October 3, 2002 (header)\n"
2430
2431
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2432
/* With these routines we avoid an integer divide, which will be slower on
2433
* most machines. However, it does take more operations than the corresponding
2434
* divide method, so it may be slower on a few RISC systems. There are two
2435
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2436
*
2437
* Note that the rounding factors are NOT supposed to be the same! 128 and
2438
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2439
* standard method.
2440
*
2441
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2442
*/
2443
2444
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2445
2446
# define png_composite(composite, fg, alpha, bg) \
2447
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2448
+ (png_uint_16)(bg)*(png_uint_16)(255 - \
2449
(png_uint_16)(alpha)) + (png_uint_16)128); \
2450
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2451
2452
# define png_composite_16(composite, fg, alpha, bg) \
2453
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2454
+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
2455
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
2456
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2457
2458
#else /* standard method using integer division */
2459
2460
# define png_composite(composite, fg, alpha, bg) \
2461
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2462
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2463
(png_uint_16)127) / 255)
2464
2465
# define png_composite_16(composite, fg, alpha, bg) \
2466
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2467
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2468
(png_uint_32)32767) / (png_uint_32)65535L)
2469
2470
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2471
2472
/* These next functions are used internally in the code. They generally
2473
* shouldn't be used unless you are writing code to add or replace some
2474
* functionality in libpng. More information about most functions can
2475
* be found in the files where the functions are located.
2476
*/
2477
2478
#if defined(PNG_INTERNAL)
2479
2480
/* Various modes of operation. Note that after an init, mode is set to
2481
* zero automatically when the structure is created.
2482
*/
2483
#define PNG_HAVE_IHDR 0x01
2484
#define PNG_HAVE_PLTE 0x02
2485
#define PNG_HAVE_IDAT 0x04
2486
#define PNG_AFTER_IDAT 0x08
2487
#define PNG_HAVE_IEND 0x10
2488
#define PNG_HAVE_gAMA 0x20
2489
#define PNG_HAVE_cHRM 0x40
2490
#define PNG_HAVE_sRGB 0x80
2491
#define PNG_HAVE_CHUNK_HEADER 0x100
2492
#define PNG_WROTE_tIME 0x200
2493
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2494
#define PNG_BACKGROUND_IS_GRAY 0x800
2495
#define PNG_HAVE_PNG_SIGNATURE 0x1000
2496
2497
/* flags for the transformations the PNG library does on the image data */
2498
#define PNG_BGR 0x0001
2499
#define PNG_INTERLACE 0x0002
2500
#define PNG_PACK 0x0004
2501
#define PNG_SHIFT 0x0008
2502
#define PNG_SWAP_BYTES 0x0010
2503
#define PNG_INVERT_MONO 0x0020
2504
#define PNG_DITHER 0x0040
2505
#define PNG_BACKGROUND 0x0080
2506
#define PNG_BACKGROUND_EXPAND 0x0100
2507
/* 0x0200 unused */
2508
#define PNG_16_TO_8 0x0400
2509
#define PNG_RGBA 0x0800
2510
#define PNG_EXPAND 0x1000
2511
#define PNG_GAMMA 0x2000
2512
#define PNG_GRAY_TO_RGB 0x4000
2513
#define PNG_FILLER 0x8000L
2514
#define PNG_PACKSWAP 0x10000L
2515
#define PNG_SWAP_ALPHA 0x20000L
2516
#define PNG_STRIP_ALPHA 0x40000L
2517
#define PNG_INVERT_ALPHA 0x80000L
2518
#define PNG_USER_TRANSFORM 0x100000L
2519
#define PNG_RGB_TO_GRAY_ERR 0x200000L
2520
#define PNG_RGB_TO_GRAY_WARN 0x400000L
2521
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2522
2523
/* flags for png_create_struct */
2524
#define PNG_STRUCT_PNG 0x0001
2525
#define PNG_STRUCT_INFO 0x0002
2526
2527
/* Scaling factor for filter heuristic weighting calculations */
2528
#define PNG_WEIGHT_SHIFT 8
2529
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2530
#define PNG_COST_SHIFT 3
2531
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2532
2533
/* flags for the png_ptr->flags rather than declaring a byte for each one */
2534
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2535
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2536
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2537
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2538
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2539
#define PNG_FLAG_ZLIB_FINISHED 0x0020
2540
#define PNG_FLAG_ROW_INIT 0x0040
2541
#define PNG_FLAG_FILLER_AFTER 0x0080
2542
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2543
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2544
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2545
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2546
#define PNG_FLAG_FREE_PLTE 0x1000
2547
#define PNG_FLAG_FREE_TRNS 0x2000
2548
#define PNG_FLAG_FREE_HIST 0x4000
2549
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2550
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2551
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2552
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2553
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2554
#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2555
2556
/* For use in png_set_keep_unknown, png_handle_as_unknown */
2557
#define HANDLE_CHUNK_AS_DEFAULT 0
2558
#define HANDLE_CHUNK_NEVER 1
2559
#define HANDLE_CHUNK_IF_SAFE 2
2560
#define HANDLE_CHUNK_ALWAYS 3
2561
2562
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2563
PNG_FLAG_CRC_ANCILLARY_NOWARN)
2564
2565
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2566
PNG_FLAG_CRC_CRITICAL_IGNORE)
2567
2568
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2569
PNG_FLAG_CRC_CRITICAL_MASK)
2570
2571
/* save typing and make code easier to understand */
2572
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2573
abs((int)((c1).green) - (int)((c2).green)) + \
2574
abs((int)((c1).blue) - (int)((c2).blue)))
2575
2576
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2577
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2578
/* place to hold the signature string for a PNG file. */
2579
#ifdef PNG_USE_GLOBAL_ARRAYS
2580
PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8];
2581
#else
2582
#define png_sig png_sig_bytes(NULL)
2583
#endif
2584
#endif /* PNG_NO_EXTERN */
2585
2586
/* Constant strings for known chunk types. If you need to add a chunk,
2587
* define the name here, and add an invocation of the macro in png.c and
2588
* wherever it's needed.
2589
*/
2590
#define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2591
#define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2592
#define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2593
#define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2594
#define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2595
#define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2596
#define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2597
#define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2598
#define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2599
#define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2600
#define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2601
#define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2602
#define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2603
#define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2604
#define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2605
#define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2606
#define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2607
#define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2608
#define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2609
#define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2610
#define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2611
2612
#ifdef PNG_USE_GLOBAL_ARRAYS
2613
PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5];
2614
PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5];
2615
PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5];
2616
PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5];
2617
PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5];
2618
PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5];
2619
PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5];
2620
PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5];
2621
PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5];
2622
PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5];
2623
PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5];
2624
PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5];
2625
PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5];
2626
PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5];
2627
PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5];
2628
PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5];
2629
PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5];
2630
PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5];
2631
PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5];
2632
PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5];
2633
PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
2634
#endif /* PNG_USE_GLOBAL_ARRAYS */
2635
2636
2637
/* Inline macros to do direct reads of bytes from the input buffer. These
2638
* require that you are using an architecture that uses PNG byte ordering
2639
* (MSB first) and supports unaligned data storage. I think that PowerPC
2640
* in big-endian mode and 680x0 are the only ones that will support this.
2641
* The x86 line of processors definitely do not. The png_get_int_32()
2642
* routine also assumes we are using two's complement format for negative
2643
* values, which is almost certainly true.
2644
*/
2645
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2646
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
2647
# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2648
# endif
2649
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2650
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2651
#else
2652
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
2653
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
2654
# endif
2655
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
2656
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
2657
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2658
2659
/* Initialize png_ptr struct for reading, and allocate any other memory.
2660
* (old interface - DEPRECATED - use png_create_read_struct instead).
2661
*/
2662
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
2663
#undef png_read_init
2664
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2665
PNG_LIBPNG_VER_STRING, sizeof(png_struct));
2666
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2667
png_const_charp user_png_ver, png_size_t png_struct_size));
2668
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2669
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2670
png_info_size));
2671
2672
/* Initialize png_ptr struct for writing, and allocate any other memory.
2673
* (old interface - DEPRECATED - use png_create_write_struct instead).
2674
*/
2675
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
2676
#undef png_write_init
2677
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2678
PNG_LIBPNG_VER_STRING, sizeof(png_struct));
2679
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2680
png_const_charp user_png_ver, png_size_t png_struct_size));
2681
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2682
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2683
png_info_size));
2684
2685
/* Allocate memory for an internal libpng struct */
2686
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
2687
2688
/* Free memory from internal libpng struct */
2689
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
2690
2691
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2692
malloc_fn, png_voidp mem_ptr));
2693
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2694
png_free_ptr free_fn, png_voidp mem_ptr));
2695
2696
/* Free any memory that info_ptr points to and reset struct. */
2697
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2698
png_infop info_ptr));
2699
2700
#ifndef PNG_1_0_X
2701
/* Function to allocate memory for zlib. */
2702
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
2703
2704
/* Function to free memory for zlib */
2705
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
2706
2707
/* Next four functions are used internally as callbacks. PNGAPI is required
2708
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2709
2710
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
2711
png_bytep data, png_size_t length));
2712
2713
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2714
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
2715
png_bytep buffer, png_size_t length));
2716
#endif
2717
2718
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
2719
png_bytep data, png_size_t length));
2720
2721
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2722
#if !defined(PNG_NO_STDIO)
2723
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
2724
#endif
2725
#endif
2726
#else /* PNG_1_0_X */
2727
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2728
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
2729
png_bytep buffer, png_size_t length));
2730
#endif
2731
#endif /* PNG_1_0_X */
2732
2733
/* Reset the CRC variable */
2734
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
2735
2736
/* Write the "data" buffer to whatever output you are using. */
2737
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
2738
png_size_t length));
2739
2740
/* Read data from whatever input you are using into the "data" buffer */
2741
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
2742
png_size_t length));
2743
2744
/* Read bytes into buf, and update png_ptr->crc */
2745
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
2746
png_size_t length));
2747
2748
/* Decompress data in a chunk that uses compression */
2749
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
2750
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
2751
PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
2752
int comp_type, png_charp chunkdata, png_size_t chunklength,
2753
png_size_t prefix_length, png_size_t *data_length));
2754
#endif
2755
2756
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
2757
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
2758
2759
/* Read the CRC from the file and compare it to the libpng calculated CRC */
2760
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
2761
2762
/* Calculate the CRC over a section of data. Note that we are only
2763
* passing a maximum of 64K on systems that have this as a memory limit,
2764
* since this is the maximum buffer size we can specify.
2765
*/
2766
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
2767
png_size_t length));
2768
2769
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2770
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
2771
#endif
2772
2773
2774
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2775
* The only currently known PNG chunks that use signed numbers are
2776
* the ancillary extension chunks, oFFs and pCAL.
2777
*/
2778
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
2779
2780
#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
2781
PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
2782
#endif
2783
2784
/* Place a 16-bit number into a buffer in PNG byte order.
2785
* The parameter is declared unsigned int, not png_uint_16,
2786
* just to avoid potential problems on pre-ANSI C compilers.
2787
*/
2788
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
2789
2790
/* simple function to write the signature */
2791
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
2792
2793
/* write various chunks */
2794
2795
/* Write the IHDR chunk, and update the png_struct with the necessary
2796
* information.
2797
*/
2798
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
2799
png_uint_32 height,
2800
int bit_depth, int color_type, int compression_method, int filter_method,
2801
int interlace_method));
2802
2803
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
2804
png_uint_32 num_pal));
2805
2806
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
2807
png_size_t length));
2808
2809
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
2810
2811
#if defined(PNG_WRITE_gAMA_SUPPORTED)
2812
#ifdef PNG_FLOATING_POINT_SUPPORTED
2813
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
2814
#endif
2815
#ifdef PNG_FIXED_POINT_SUPPORTED
2816
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
2817
file_gamma));
2818
#endif
2819
#endif
2820
2821
#if defined(PNG_WRITE_sBIT_SUPPORTED)
2822
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
2823
int color_type));
2824
#endif
2825
2826
#if defined(PNG_WRITE_cHRM_SUPPORTED)
2827
#ifdef PNG_FLOATING_POINT_SUPPORTED
2828
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
2829
double white_x, double white_y,
2830
double red_x, double red_y, double green_x, double green_y,
2831
double blue_x, double blue_y));
2832
#endif
2833
#ifdef PNG_FIXED_POINT_SUPPORTED
2834
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
2835
png_fixed_point int_white_x, png_fixed_point int_white_y,
2836
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2837
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2838
png_fixed_point int_blue_y));
2839
#endif
2840
#endif
2841
2842
#if defined(PNG_WRITE_sRGB_SUPPORTED)
2843
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
2844
int intent));
2845
#endif
2846
2847
#if defined(PNG_WRITE_iCCP_SUPPORTED)
2848
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
2849
png_charp name, int compression_type,
2850
png_charp profile, int proflen));
2851
/* Note to maintainer: profile should be png_bytep */
2852
#endif
2853
2854
#if defined(PNG_WRITE_sPLT_SUPPORTED)
2855
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
2856
png_sPLT_tp palette));
2857
#endif
2858
2859
#if defined(PNG_WRITE_tRNS_SUPPORTED)
2860
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
2861
png_color_16p values, int number, int color_type));
2862
#endif
2863
2864
#if defined(PNG_WRITE_bKGD_SUPPORTED)
2865
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
2866
png_color_16p values, int color_type));
2867
#endif
2868
2869
#if defined(PNG_WRITE_hIST_SUPPORTED)
2870
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
2871
int num_hist));
2872
#endif
2873
2874
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
2875
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
2876
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
2877
png_charp key, png_charpp new_key));
2878
#endif
2879
2880
#if defined(PNG_WRITE_tEXt_SUPPORTED)
2881
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
2882
png_charp text, png_size_t text_len));
2883
#endif
2884
2885
#if defined(PNG_WRITE_zTXt_SUPPORTED)
2886
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
2887
png_charp text, png_size_t text_len, int compression));
2888
#endif
2889
2890
#if defined(PNG_WRITE_iTXt_SUPPORTED)
2891
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
2892
int compression, png_charp key, png_charp lang, png_charp lang_key,
2893
png_charp text));
2894
#endif
2895
2896
#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
2897
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
2898
png_infop info_ptr, png_textp text_ptr, int num_text));
2899
#endif
2900
2901
#if defined(PNG_WRITE_oFFs_SUPPORTED)
2902
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
2903
png_int_32 x_offset, png_int_32 y_offset, int unit_type));
2904
#endif
2905
2906
#if defined(PNG_WRITE_pCAL_SUPPORTED)
2907
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
2908
png_int_32 X0, png_int_32 X1, int type, int nparams,
2909
png_charp units, png_charpp params));
2910
#endif
2911
2912
#if defined(PNG_WRITE_pHYs_SUPPORTED)
2913
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
2914
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
2915
int unit_type));
2916
#endif
2917
2918
#if defined(PNG_WRITE_tIME_SUPPORTED)
2919
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
2920
png_timep mod_time));
2921
#endif
2922
2923
#if defined(PNG_WRITE_sCAL_SUPPORTED)
2924
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
2925
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
2926
int unit, double width, double height));
2927
#else
2928
#ifdef PNG_FIXED_POINT_SUPPORTED
2929
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
2930
int unit, png_charp width, png_charp height));
2931
#endif
2932
#endif
2933
#endif
2934
2935
/* Called when finished processing a row of data */
2936
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
2937
2938
/* Internal use only. Called before first row of data */
2939
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
2940
2941
#if defined(PNG_READ_GAMMA_SUPPORTED)
2942
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
2943
#endif
2944
2945
/* combine a row of data, dealing with alpha, etc. if requested */
2946
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
2947
int mask));
2948
2949
#if defined(PNG_READ_INTERLACING_SUPPORTED)
2950
/* expand an interlaced row */
2951
/* OLD pre-1.0.9 interface:
2952
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
2953
png_bytep row, int pass, png_uint_32 transformations));
2954
*/
2955
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
2956
#endif
2957
2958
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
2959
2960
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
2961
/* grab pixels out of a row for an interlaced pass */
2962
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
2963
png_bytep row, int pass));
2964
#endif
2965
2966
/* unfilter a row */
2967
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
2968
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
2969
2970
/* Choose the best filter to use and filter the row data */
2971
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
2972
png_row_infop row_info));
2973
2974
/* Write out the filtered row. */
2975
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
2976
png_bytep filtered_row));
2977
/* finish a row while reading, dealing with interlacing passes, etc. */
2978
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
2979
2980
/* initialize the row buffers, etc. */
2981
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
2982
/* optional call to update the users info structure */
2983
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
2984
png_infop info_ptr));
2985
2986
/* these are the functions that do the transformations */
2987
#if defined(PNG_READ_FILLER_SUPPORTED)
2988
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
2989
png_bytep row, png_uint_32 filler, png_uint_32 flags));
2990
#endif
2991
2992
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
2993
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
2994
png_bytep row));
2995
#endif
2996
2997
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
2998
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
2999
png_bytep row));
3000
#endif
3001
3002
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3003
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3004
png_bytep row));
3005
#endif
3006
3007
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3008
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3009
png_bytep row));
3010
#endif
3011
3012
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3013
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3014
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3015
png_bytep row, png_uint_32 flags));
3016
#endif
3017
3018
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3019
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3020
#endif
3021
3022
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3023
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3024
#endif
3025
3026
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3027
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3028
row_info, png_bytep row));
3029
#endif
3030
3031
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3032
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3033
png_bytep row));
3034
#endif
3035
3036
#if defined(PNG_READ_PACK_SUPPORTED)
3037
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3038
#endif
3039
3040
#if defined(PNG_READ_SHIFT_SUPPORTED)
3041
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3042
png_color_8p sig_bits));
3043
#endif
3044
3045
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3046
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3047
#endif
3048
3049
#if defined(PNG_READ_16_TO_8_SUPPORTED)
3050
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3051
#endif
3052
3053
#if defined(PNG_READ_DITHER_SUPPORTED)
3054
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3055
png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3056
3057
# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3058
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3059
png_colorp palette, int num_palette));
3060
# endif
3061
#endif
3062
3063
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3064
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3065
#endif
3066
3067
#if defined(PNG_WRITE_PACK_SUPPORTED)
3068
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3069
png_bytep row, png_uint_32 bit_depth));
3070
#endif
3071
3072
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
3073
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3074
png_color_8p bit_depth));
3075
#endif
3076
3077
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
3078
#if defined(PNG_READ_GAMMA_SUPPORTED)
3079
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3080
png_color_16p trans_values, png_color_16p background,
3081
png_color_16p background_1,
3082
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3083
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3084
png_uint_16pp gamma_16_to_1, int gamma_shift));
3085
#else
3086
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3087
png_color_16p trans_values, png_color_16p background));
3088
#endif
3089
#endif
3090
3091
#if defined(PNG_READ_GAMMA_SUPPORTED)
3092
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3093
png_bytep gamma_table, png_uint_16pp gamma_16_table,
3094
int gamma_shift));
3095
#endif
3096
3097
#if defined(PNG_READ_EXPAND_SUPPORTED)
3098
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3099
png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3100
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3101
png_bytep row, png_color_16p trans_value));
3102
#endif
3103
3104
/* The following decodes the appropriate chunks, and does error correction,
3105
* then calls the appropriate callback for the chunk if it is valid.
3106
*/
3107
3108
/* decode the IHDR chunk */
3109
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3110
png_uint_32 length));
3111
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3112
png_uint_32 length));
3113
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3114
png_uint_32 length));
3115
3116
#if defined(PNG_READ_bKGD_SUPPORTED)
3117
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3118
png_uint_32 length));
3119
#endif
3120
3121
#if defined(PNG_READ_cHRM_SUPPORTED)
3122
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3123
png_uint_32 length));
3124
#endif
3125
3126
#if defined(PNG_READ_gAMA_SUPPORTED)
3127
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3128
png_uint_32 length));
3129
#endif
3130
3131
#if defined(PNG_READ_hIST_SUPPORTED)
3132
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3133
png_uint_32 length));
3134
#endif
3135
3136
#if defined(PNG_READ_iCCP_SUPPORTED)
3137
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3138
png_uint_32 length));
3139
#endif /* PNG_READ_iCCP_SUPPORTED */
3140
3141
#if defined(PNG_READ_iTXt_SUPPORTED)
3142
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3143
png_uint_32 length));
3144
#endif
3145
3146
#if defined(PNG_READ_oFFs_SUPPORTED)
3147
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3148
png_uint_32 length));
3149
#endif
3150
3151
#if defined(PNG_READ_pCAL_SUPPORTED)
3152
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3153
png_uint_32 length));
3154
#endif
3155
3156
#if defined(PNG_READ_pHYs_SUPPORTED)
3157
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3158
png_uint_32 length));
3159
#endif
3160
3161
#if defined(PNG_READ_sBIT_SUPPORTED)
3162
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3163
png_uint_32 length));
3164
#endif
3165
3166
#if defined(PNG_READ_sCAL_SUPPORTED)
3167
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3168
png_uint_32 length));
3169
#endif
3170
3171
#if defined(PNG_READ_sPLT_SUPPORTED)
3172
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3173
png_uint_32 length));
3174
#endif /* PNG_READ_sPLT_SUPPORTED */
3175
3176
#if defined(PNG_READ_sRGB_SUPPORTED)
3177
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3178
png_uint_32 length));
3179
#endif
3180
3181
#if defined(PNG_READ_tEXt_SUPPORTED)
3182
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3183
png_uint_32 length));
3184
#endif
3185
3186
#if defined(PNG_READ_tIME_SUPPORTED)
3187
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3188
png_uint_32 length));
3189
#endif
3190
3191
#if defined(PNG_READ_tRNS_SUPPORTED)
3192
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3193
png_uint_32 length));
3194
#endif
3195
3196
#if defined(PNG_READ_zTXt_SUPPORTED)
3197
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3198
png_uint_32 length));
3199
#endif
3200
3201
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3202
png_infop info_ptr, png_uint_32 length));
3203
3204
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3205
png_bytep chunk_name));
3206
3207
/* handle the transformations for reading and writing */
3208
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3209
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3210
3211
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3212
3213
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3214
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3215
png_infop info_ptr));
3216
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3217
png_infop info_ptr));
3218
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3219
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3220
png_uint_32 length));
3221
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3222
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3223
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3224
png_bytep buffer, png_size_t buffer_length));
3225
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3226
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3227
png_bytep buffer, png_size_t buffer_length));
3228
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3229
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3230
png_infop info_ptr, png_uint_32 length));
3231
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3232
png_infop info_ptr));
3233
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3234
png_infop info_ptr));
3235
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3236
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3237
png_infop info_ptr));
3238
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3239
png_infop info_ptr));
3240
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3241
#if defined(PNG_READ_tEXt_SUPPORTED)
3242
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3243
png_infop info_ptr, png_uint_32 length));
3244
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3245
png_infop info_ptr));
3246
#endif
3247
#if defined(PNG_READ_zTXt_SUPPORTED)
3248
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3249
png_infop info_ptr, png_uint_32 length));
3250
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3251
png_infop info_ptr));
3252
#endif
3253
#if defined(PNG_READ_iTXt_SUPPORTED)
3254
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3255
png_infop info_ptr, png_uint_32 length));
3256
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3257
png_infop info_ptr));
3258
#endif
3259
3260
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3261
3262
#ifdef PNG_MNG_FEATURES_SUPPORTED
3263
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3264
png_bytep row));
3265
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3266
png_bytep row));
3267
#endif
3268
3269
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3270
/* png.c */ /* PRIVATE */
3271
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3272
#endif
3273
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3274
3275
#endif /* PNG_INTERNAL */
3276
3277
#ifdef __cplusplus
3278
}
3279
#endif
3280
3281
#endif /* PNG_VERSION_INFO_ONLY */
3282
/* do not put anything past this line */
3283
#endif /* PNG_H */
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