1 |   |
2 | /* png.h - header file for PNG reference library  |
3 | *  |
4 | * libpng version 1.6.37 - April 14, 2019  |
5 | *  |
6 | * Copyright (c) 2018-2019 Cosmin Truta  |
7 | * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson  |
8 | * Copyright (c) 1996-1997 Andreas Dilger  |
9 | * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.  |
10 | *  |
11 | * This code is released under the libpng license. (See LICENSE, below.)  |
12 | *  |
13 | * Authors and maintainers:  |
14 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat  |
15 | * libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger  |
16 | * libpng versions 0.97, January 1998, through 1.6.35, July 2018:  |
17 | * Glenn Randers-Pehrson  |
18 | * libpng versions 1.6.36, December 2018, through 1.6.37, April 2019:  |
19 | * Cosmin Truta  |
20 | * See also "Contributing Authors", below.  |
21 | */  |
22 |   |
23 | /*  |
24 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE  |
25 | * =========================================  |
26 | *  |
27 | * PNG Reference Library License version 2  |
28 | * ---------------------------------------  |
29 | *  |
30 | * * Copyright (c) 1995-2019 The PNG Reference Library Authors.  |
31 | * * Copyright (c) 2018-2019 Cosmin Truta.  |
32 | * * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson.  |
33 | * * Copyright (c) 1996-1997 Andreas Dilger.  |
34 | * * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.  |
35 | *  |
36 | * The software is supplied "as is", without warranty of any kind,  |
37 | * express or implied, including, without limitation, the warranties  |
38 | * of merchantability, fitness for a particular purpose, title, and  |
39 | * non-infringement. In no event shall the Copyright owners, or  |
40 | * anyone distributing the software, be liable for any damages or  |
41 | * other liability, whether in contract, tort or otherwise, arising  |
42 | * from, out of, or in connection with the software, or the use or  |
43 | * other dealings in the software, even if advised of the possibility  |
44 | * of such damage.  |
45 | *  |
46 | * Permission is hereby granted to use, copy, modify, and distribute  |
47 | * this software, or portions hereof, for any purpose, without fee,  |
48 | * subject to the following restrictions:  |
49 | *  |
50 | * 1. The origin of this software must not be misrepresented; you  |
51 | * must not claim that you wrote the original software. If you  |
52 | * use this software in a product, an acknowledgment in the product  |
53 | * documentation would be appreciated, but is not required.  |
54 | *  |
55 | * 2. Altered source versions must be plainly marked as such, and must  |
56 | * not be misrepresented as being the original software.  |
57 | *  |
58 | * 3. This Copyright notice may not be removed or altered from any  |
59 | * source or altered source distribution.  |
60 | *  |
61 | *  |
62 | * PNG Reference Library License version 1 (for libpng 0.5 through 1.6.35)  |
63 | * -----------------------------------------------------------------------  |
64 | *  |
65 | * libpng versions 1.0.7, July 1, 2000, through 1.6.35, July 15, 2018 are  |
66 | * Copyright (c) 2000-2002, 2004, 2006-2018 Glenn Randers-Pehrson, are  |
67 | * derived from libpng-1.0.6, and are distributed according to the same  |
68 | * disclaimer and license as libpng-1.0.6 with the following individuals  |
69 | * added to the list of Contributing Authors:  |
70 | *  |
71 | * Simon-Pierre Cadieux  |
72 | * Eric S. Raymond  |
73 | * Mans Rullgard  |
74 | * Cosmin Truta  |
75 | * Gilles Vollant  |
76 | * James Yu  |
77 | * Mandar Sahastrabuddhe  |
78 | * Google Inc.  |
79 | * Vadim Barkov  |
80 | *  |
81 | * and with the following additions to the disclaimer:  |
82 | *  |
83 | * There is no warranty against interference with your enjoyment of  |
84 | * the library or against infringement. There is no warranty that our  |
85 | * efforts or the library will fulfill any of your particular purposes  |
86 | * or needs. This library is provided with all faults, and the entire  |
87 | * risk of satisfactory quality, performance, accuracy, and effort is  |
88 | * with the user.  |
89 | *  |
90 | * Some files in the "contrib" directory and some configure-generated  |
91 | * files that are distributed with libpng have other copyright owners, and  |
92 | * are released under other open source licenses.  |
93 | *  |
94 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are  |
95 | * Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from  |
96 | * libpng-0.96, and are distributed according to the same disclaimer and  |
97 | * license as libpng-0.96, with the following individuals added to the  |
98 | * list of Contributing Authors:  |
99 | *  |
100 | * Tom Lane  |
101 | * Glenn Randers-Pehrson  |
102 | * Willem van Schaik  |
103 | *  |
104 | * libpng versions 0.89, June 1996, through 0.96, May 1997, are  |
105 | * Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,  |
106 | * and are distributed according to the same disclaimer and license as  |
107 | * libpng-0.88, with the following individuals added to the list of  |
108 | * Contributing Authors:  |
109 | *  |
110 | * John Bowler  |
111 | * Kevin Bracey  |
112 | * Sam Bushell  |
113 | * Magnus Holmgren  |
114 | * Greg Roelofs  |
115 | * Tom Tanner  |
116 | *  |
117 | * Some files in the "scripts" directory have other copyright owners,  |
118 | * but are released under this license.  |
119 | *  |
120 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are  |
121 | * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.  |
122 | *  |
123 | * For the purposes of this copyright and license, "Contributing Authors"  |
124 | * is defined as the following set of individuals:  |
125 | *  |
126 | * Andreas Dilger  |
127 | * Dave Martindale  |
128 | * Guy Eric Schalnat  |
129 | * Paul Schmidt  |
130 | * Tim Wegner  |
131 | *  |
132 | * The PNG Reference Library is supplied "AS IS". The Contributing  |
133 | * Authors and Group 42, Inc. disclaim all warranties, expressed or  |
134 | * implied, including, without limitation, the warranties of  |
135 | * merchantability and of fitness for any purpose. The Contributing  |
136 | * Authors and Group 42, Inc. assume no liability for direct, indirect,  |
137 | * incidental, special, exemplary, or consequential damages, which may  |
138 | * result from the use of the PNG Reference Library, even if advised of  |
139 | * the possibility of such damage.  |
140 | *  |
141 | * Permission is hereby granted to use, copy, modify, and distribute this  |
142 | * source code, or portions hereof, for any purpose, without fee, subject  |
143 | * to the following restrictions:  |
144 | *  |
145 | * 1. The origin of this source code must not be misrepresented.  |
146 | *  |
147 | * 2. Altered versions must be plainly marked as such and must not  |
148 | * be misrepresented as being the original source.  |
149 | *  |
150 | * 3. This Copyright notice may not be removed or altered from any  |
151 | * source or altered source distribution.  |
152 | *  |
153 | * The Contributing Authors and Group 42, Inc. specifically permit,  |
154 | * without fee, and encourage the use of this source code as a component  |
155 | * to supporting the PNG file format in commercial products. If you use  |
156 | * this source code in a product, acknowledgment is not required but would  |
157 | * be appreciated.  |
158 | *  |
159 | * END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.  |
160 | *  |
161 | * TRADEMARK  |
162 | * =========  |
163 | *  |
164 | * The name "libpng" has not been registered by the Copyright owners  |
165 | * as a trademark in any jurisdiction. However, because libpng has  |
166 | * been distributed and maintained world-wide, continually since 1995,  |
167 | * the Copyright owners claim "common-law trademark protection" in any  |
168 | * jurisdiction where common-law trademark is recognized.  |
169 | */  |
170 |   |
171 | /*  |
172 | * A "png_get_copyright" function is available, for convenient use in "about"  |
173 | * boxes and the like:  |
174 | *  |
175 | * printf("%s", png_get_copyright(NULL));  |
176 | *  |
177 | * Also, the PNG logo (in PNG format, of course) is supplied in the  |
178 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).  |
179 | */  |
180 |   |
181 | /*  |
182 | * The contributing authors would like to thank all those who helped  |
183 | * with testing, bug fixes, and patience. This wouldn't have been  |
184 | * possible without all of you.  |
185 | *  |
186 | * Thanks to Frank J. T. Wojcik for helping with the documentation.  |
187 | */  |
188 |   |
189 | /* Note about libpng version numbers:  |
190 | *  |
191 | * Due to various miscommunications, unforeseen code incompatibilities  |
192 | * and occasional factors outside the authors' control, version numbering  |
193 | * on the library has not always been consistent and straightforward.  |
194 | * The following table summarizes matters since version 0.89c, which was  |
195 | * the first widely used release:  |
196 | *  |
197 | * source png.h png.h shared-lib  |
198 | * version string int version  |
199 | * ------- ------ ----- ----------  |
200 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89  |
201 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]  |
202 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]  |
203 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]  |
204 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]  |
205 | * 0.97c 0.97 97 2.0.97  |
206 | * 0.98 0.98 98 2.0.98  |
207 | * 0.99 0.99 98 2.0.99  |
208 | * 0.99a-m 0.99 99 2.0.99  |
209 | * 1.00 1.00 100 2.1.0 [100 should be 10000]  |
210 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]  |
211 | * 1.0.1 png.h string is 10001 2.1.0  |
212 | * 1.0.1a-e identical to the 10002 from here on, the shared library  |
213 | * 1.0.2 source version) 10002 is 2.V where V is the source code  |
214 | * 1.0.2a-b 10003 version, except as noted.  |
215 | * 1.0.3 10003  |
216 | * 1.0.3a-d 10004  |
217 | * 1.0.4 10004  |
218 | * 1.0.4a-f 10005  |
219 | * 1.0.5 (+ 2 patches) 10005  |
220 | * 1.0.5a-d 10006  |
221 | * 1.0.5e-r 10100 (not source compatible)  |
222 | * 1.0.5s-v 10006 (not binary compatible)  |
223 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)  |
224 | * 1.0.6d-f 10007 (still binary incompatible)  |
225 | * 1.0.6g 10007  |
226 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering)  |
227 | * 1.0.6i 10007 10.6i  |
228 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)  |
229 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)  |
230 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)  |
231 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)  |
232 | * 1.0.7 1 10007 (still compatible)  |
233 | * ...  |
234 | * 1.0.69 10 10069 10.so.0.69[.0]  |
235 | * ...  |
236 | * 1.2.59 13 10259 12.so.0.59[.0]  |
237 | * ...  |
238 | * 1.4.20 14 10420 14.so.0.20[.0]  |
239 | * ...  |
240 | * 1.5.30 15 10530 15.so.15.30[.0]  |
241 | * ...  |
242 | * 1.6.37 16 10637 16.so.16.37[.0]  |
243 | *  |
244 | * Henceforth the source version will match the shared-library major and  |
245 | * minor numbers; the shared-library major version number will be used for  |
246 | * changes in backward compatibility, as it is intended.  |
247 | * The PNG_LIBPNG_VER macro, which is not used within libpng but is  |
248 | * available for applications, is an unsigned integer of the form XYYZZ  |
249 | * corresponding to the source version X.Y.Z (leading zeros in Y and Z).  |
250 | * Beta versions were given the previous public release number plus a  |
251 | * letter, until version 1.0.6j; from then on they were given the upcoming  |
252 | * public release number plus "betaNN" or "rcNN".  |
253 | *  |
254 | * Binary incompatibility exists only when applications make direct access  |
255 | * to the info_ptr or png_ptr members through png.h, and the compiled  |
256 | * application is loaded with a different version of the library.  |
257 | *  |
258 | * DLLNUM will change each time there are forward or backward changes  |
259 | * in binary compatibility (e.g., when a new feature is added).  |
260 | *  |
261 | * See libpng.txt or libpng.3 for more information. The PNG specification  |
262 | * is available as a W3C Recommendation and as an ISO/IEC Standard; see  |
263 | * <https://www.w3.org/TR/2003/REC-PNG-20031110/>  |
264 | */  |
265 |   |
266 | #ifndef PNG_H  |
267 | #define PNG_H  |
268 |   |
269 | /* This is not the place to learn how to use libpng. The file libpng-manual.txt  |
270 | * describes how to use libpng, and the file example.c summarizes it  |
271 | * with some code on which to build. This file is useful for looking  |
272 | * at the actual function definitions and structure components. If that  |
273 | * file has been stripped from your copy of libpng, you can find it at  |
274 | * <http://www.libpng.org/pub/png/libpng-manual.txt>  |
275 | *  |
276 | * If you just need to read a PNG file and don't want to read the documentation  |
277 | * skip to the end of this file and read the section entitled 'simplified API'.  |
278 | */  |
279 |   |
280 | /* Version information for png.h - this should match the version in png.c */  |
281 | #define PNG_LIBPNG_VER_STRING "1.6.37"  |
282 | #define " libpng version 1.6.37 - April 14, 2019\n"  |
283 |   |
284 | #define PNG_LIBPNG_VER_SONUM 16  |
285 | #define PNG_LIBPNG_VER_DLLNUM 16  |
286 |   |
287 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */  |
288 | #define PNG_LIBPNG_VER_MAJOR 1  |
289 | #define PNG_LIBPNG_VER_MINOR 6  |
290 | #define PNG_LIBPNG_VER_RELEASE 37  |
291 |   |
292 | /* This should be zero for a public release, or non-zero for a  |
293 | * development version. [Deprecated]  |
294 | */  |
295 | #define PNG_LIBPNG_VER_BUILD 0  |
296 |   |
297 | /* Release Status */  |
298 | #define PNG_LIBPNG_BUILD_ALPHA 1  |
299 | #define PNG_LIBPNG_BUILD_BETA 2  |
300 | #define PNG_LIBPNG_BUILD_RC 3  |
301 | #define PNG_LIBPNG_BUILD_STABLE 4  |
302 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7  |
303 |   |
304 | /* Release-Specific Flags */  |
305 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with  |
306 | PNG_LIBPNG_BUILD_STABLE only */  |
307 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with  |
308 | PNG_LIBPNG_BUILD_SPECIAL */  |
309 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with  |
310 | PNG_LIBPNG_BUILD_PRIVATE */  |
311 |   |
312 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE  |
313 |   |
314 | /* Careful here. At one time, Guy wanted to use 082, but that  |
315 | * would be octal. We must not include leading zeros.  |
316 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here  |
317 | * (only version 1.0.0 was mis-numbered 100 instead of 10000).  |
318 | * From version 1.0.1 it is:  |
319 | * XXYYZZ, where XX=major, YY=minor, ZZ=release  |
320 | */  |
321 | #define PNG_LIBPNG_VER 10637 /* 1.6.37 */  |
322 |   |
323 | /* Library configuration: these options cannot be changed after  |
324 | * the library has been built.  |
325 | */  |
326 | #ifndef PNGLCONF_H  |
327 | /* If pnglibconf.h is missing, you can  |
328 | * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h  |
329 | */  |
330 | # include "pnglibconf.h"  |
331 | #endif  |
332 |   |
333 | #define PNG_APNG_SUPPORTED  |
334 | #define PNG_READ_APNG_SUPPORTED  |
335 | #define PNG_WRITE_APNG_SUPPORTED  |
336 |   |
337 | #ifndef PNG_VERSION_INFO_ONLY  |
338 | /* Machine specific configuration. */  |
339 | # include "pngconf.h"  |
340 | #endif  |
341 |   |
342 | /*  |
343 | * Added at libpng-1.2.8  |
344 | *  |
345 | * Ref MSDN: Private as priority over Special  |
346 | * VS_FF_PRIVATEBUILD File *was not* built using standard release  |
347 | * procedures. If this value is given, the StringFileInfo block must  |
348 | * contain a PrivateBuild string.  |
349 | *  |
350 | * VS_FF_SPECIALBUILD File *was* built by the original company using  |
351 | * standard release procedures but is a variation of the standard  |
352 | * file of the same version number. If this value is given, the  |
353 | * StringFileInfo block must contain a SpecialBuild string.  |
354 | */  |
355 |   |
356 | #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */  |
357 | # define PNG_LIBPNG_BUILD_TYPE \  |
358 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)  |
359 | #else  |
360 | # ifdef PNG_LIBPNG_SPECIALBUILD  |
361 | # define PNG_LIBPNG_BUILD_TYPE \  |
362 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)  |
363 | # else  |
364 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)  |
365 | # endif  |
366 | #endif  |
367 |   |
368 | #ifndef PNG_VERSION_INFO_ONLY  |
369 |   |
370 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */  |
371 | #ifdef __cplusplus  |
372 | extern "C" {  |
373 | #endif /* __cplusplus */  |
374 |   |
375 | /* Version information for C files, stored in png.c. This had better match  |
376 | * the version above.  |
377 | */  |
378 | #define png_libpng_ver png_get_header_ver(NULL)  |
379 |   |
380 | /* This file is arranged in several sections:  |
381 | *  |
382 | * 1. [omitted]  |
383 | * 2. Any configuration options that can be specified by for the application  |
384 | * code when it is built. (Build time configuration is in pnglibconf.h)  |
385 | * 3. Type definitions (base types are defined in pngconf.h), structure  |
386 | * definitions.  |
387 | * 4. Exported library functions.  |
388 | * 5. Simplified API.  |
389 | * 6. Implementation options.  |
390 | *  |
391 | * The library source code has additional files (principally pngpriv.h) that  |
392 | * allow configuration of the library.  |
393 | */  |
394 |   |
395 | /* Section 1: [omitted] */  |
396 |   |
397 | /* Section 2: run time configuration  |
398 | * See pnglibconf.h for build time configuration  |
399 | *  |
400 | * Run time configuration allows the application to choose between  |
401 | * implementations of certain arithmetic APIs. The default is set  |
402 | * at build time and recorded in pnglibconf.h, but it is safe to  |
403 | * override these (and only these) settings. Note that this won't  |
404 | * change what the library does, only application code, and the  |
405 | * settings can (and probably should) be made on a per-file basis  |
406 | * by setting the #defines before including png.h  |
407 | *  |
408 | * Use macros to read integers from PNG data or use the exported  |
409 | * functions?  |
410 | * PNG_USE_READ_MACROS: use the macros (see below) Note that  |
411 | * the macros evaluate their argument multiple times.  |
412 | * PNG_NO_USE_READ_MACROS: call the relevant library function.  |
413 | *  |
414 | * Use the alternative algorithm for compositing alpha samples that  |
415 | * does not use division?  |
416 | * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'  |
417 | * algorithm.  |
418 | * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.  |
419 | *  |
420 | * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is  |
421 | * false?  |
422 | * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error  |
423 | * APIs to png_warning.  |
424 | * Otherwise the calls are mapped to png_error.  |
425 | */  |
426 |   |
427 | /* Section 3: type definitions, including structures and compile time  |
428 | * constants.  |
429 | * See pngconf.h for base types that vary by machine/system  |
430 | */  |
431 |   |
432 | #ifdef PNG_APNG_SUPPORTED  |
433 | /* dispose_op flags from inside fcTL */  |
434 | #define PNG_DISPOSE_OP_NONE 0x00U  |
435 | #define PNG_DISPOSE_OP_BACKGROUND 0x01U  |
436 | #define PNG_DISPOSE_OP_PREVIOUS 0x02U  |
437 |   |
438 | /* blend_op flags from inside fcTL */  |
439 | #define PNG_BLEND_OP_SOURCE 0x00U  |
440 | #define PNG_BLEND_OP_OVER 0x01U  |
441 | #endif /* PNG_APNG_SUPPORTED */  |
442 |   |
443 | /* This triggers a compiler error in png.c, if png.c and png.h  |
444 | * do not agree upon the version number.  |
445 | */  |
446 | typedef char* png_libpng_version_1_6_37;  |
447 |   |
448 | /* Basic control structions. Read libpng-manual.txt or libpng.3 for more info.  |
449 | *  |
450 | * png_struct is the cache of information used while reading or writing a single  |
451 | * PNG file. One of these is always required, although the simplified API  |
452 | * (below) hides the creation and destruction of it.  |
453 | */  |
454 | typedef struct png_struct_def png_struct;  |
455 | typedef const png_struct * png_const_structp;  |
456 | typedef png_struct * png_structp;  |
457 | typedef png_struct * * png_structpp;  |
458 |   |
459 | /* png_info contains information read from or to be written to a PNG file. One  |
460 | * or more of these must exist while reading or creating a PNG file. The  |
461 | * information is not used by libpng during read but is used to control what  |
462 | * gets written when a PNG file is created. "png_get_" function calls read  |
463 | * information during read and "png_set_" functions calls write information  |
464 | * when creating a PNG.  |
465 | * been moved into a separate header file that is not accessible to  |
466 | * applications. Read libpng-manual.txt or libpng.3 for more info.  |
467 | */  |
468 | typedef struct png_info_def png_info;  |
469 | typedef png_info * png_infop;  |
470 | typedef const png_info * png_const_infop;  |
471 | typedef png_info * * png_infopp;  |
472 |   |
473 | /* Types with names ending 'p' are pointer types. The corresponding types with  |
474 | * names ending 'rp' are identical pointer types except that the pointer is  |
475 | * marked 'restrict', which means that it is the only pointer to the object  |
476 | * passed to the function. Applications should not use the 'restrict' types;  |
477 | * it is always valid to pass 'p' to a pointer with a function argument of the  |
478 | * corresponding 'rp' type. Different compilers have different rules with  |
479 | * regard to type matching in the presence of 'restrict'. For backward  |
480 | * compatibility libpng callbacks never have 'restrict' in their parameters and,  |
481 | * consequentially, writing portable application code is extremely difficult if  |
482 | * an attempt is made to use 'restrict'.  |
483 | */  |
484 | typedef png_struct * PNG_RESTRICT png_structrp;  |
485 | typedef const png_struct * PNG_RESTRICT png_const_structrp;  |
486 | typedef png_info * PNG_RESTRICT png_inforp;  |
487 | typedef const png_info * PNG_RESTRICT png_const_inforp;  |
488 |   |
489 | /* Three color definitions. The order of the red, green, and blue, (and the  |
490 | * exact size) is not important, although the size of the fields need to  |
491 | * be png_byte or png_uint_16 (as defined below).  |
492 | */  |
493 | typedef struct png_color_struct  |
494 | {  |
495 | png_byte red;  |
496 | png_byte green;  |
497 | png_byte blue;  |
498 | } png_color;  |
499 | typedef png_color * png_colorp;  |
500 | typedef const png_color * png_const_colorp;  |
501 | typedef png_color * * png_colorpp;  |
502 |   |
503 | typedef struct png_color_16_struct  |
504 | {  |
505 | png_byte index; /* used for palette files */  |
506 | png_uint_16 red; /* for use in red green blue files */  |
507 | png_uint_16 green;  |
508 | png_uint_16 blue;  |
509 | png_uint_16 gray; /* for use in grayscale files */  |
510 | } png_color_16;  |
511 | typedef png_color_16 * png_color_16p;  |
512 | typedef const png_color_16 * png_const_color_16p;  |
513 | typedef png_color_16 * * png_color_16pp;  |
514 |   |
515 | typedef struct png_color_8_struct  |
516 | {  |
517 | png_byte red; /* for use in red green blue files */  |
518 | png_byte green;  |
519 | png_byte blue;  |
520 | png_byte gray; /* for use in grayscale files */  |
521 | png_byte alpha; /* for alpha channel files */  |
522 | } png_color_8;  |
523 | typedef png_color_8 * png_color_8p;  |
524 | typedef const png_color_8 * png_const_color_8p;  |
525 | typedef png_color_8 * * png_color_8pp;  |
526 |   |
527 | /*  |
528 | * The following two structures are used for the in-core representation  |
529 | * of sPLT chunks.  |
530 | */  |
531 | typedef struct png_sPLT_entry_struct  |
532 | {  |
533 | png_uint_16 red;  |
534 | png_uint_16 green;  |
535 | png_uint_16 blue;  |
536 | png_uint_16 alpha;  |
537 | png_uint_16 frequency;  |
538 | } png_sPLT_entry;  |
539 | typedef png_sPLT_entry * png_sPLT_entryp;  |
540 | typedef const png_sPLT_entry * png_const_sPLT_entryp;  |
541 | typedef png_sPLT_entry * * png_sPLT_entrypp;  |
542 |   |
543 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples  |
544 | * occupy the LSB of their respective members, and the MSB of each member  |
545 | * is zero-filled. The frequency member always occupies the full 16 bits.  |
546 | */  |
547 |   |
548 | typedef struct png_sPLT_struct  |
549 | {  |
550 | png_charp name; /* palette name */  |
551 | png_byte depth; /* depth of palette samples */  |
552 | png_sPLT_entryp entries; /* palette entries */  |
553 | png_int_32 nentries; /* number of palette entries */  |
554 | } png_sPLT_t;  |
555 | typedef png_sPLT_t * png_sPLT_tp;  |
556 | typedef const png_sPLT_t * png_const_sPLT_tp;  |
557 | typedef png_sPLT_t * * png_sPLT_tpp;  |
558 |   |
559 | #ifdef PNG_TEXT_SUPPORTED  |
560 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,  |
561 | * and whether that contents is compressed or not. The "key" field  |
562 | * points to a regular zero-terminated C string. The "text" fields can be a  |
563 | * regular C string, an empty string, or a NULL pointer.  |
564 | * However, the structure returned by png_get_text() will always contain  |
565 | * the "text" field as a regular zero-terminated C string (possibly  |
566 | * empty), never a NULL pointer, so it can be safely used in printf() and  |
567 | * other string-handling functions. Note that the "itxt_length", "lang", and  |
568 | * "lang_key" members of the structure only exist when the library is built  |
569 | * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by  |
570 | * default without iTXt support. Also note that when iTXt *is* supported,  |
571 | * the "lang" and "lang_key" fields contain NULL pointers when the  |
572 | * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or  |
573 | * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the  |
574 | * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"  |
575 | * which is always 0 or 1, or its "compression method" which is always 0.  |
576 | */  |
577 | typedef struct png_text_struct  |
578 | {  |
579 | int compression; /* compression value:  |
580 | -1: tEXt, none  |
581 | 0: zTXt, deflate  |
582 | 1: iTXt, none  |
583 | 2: iTXt, deflate */  |
584 | png_charp key; /* keyword, 1-79 character description of "text" */  |
585 | png_charp text; /* comment, may be an empty string (ie "")  |
586 | or a NULL pointer */  |
587 | size_t text_length; /* length of the text string */  |
588 | size_t itxt_length; /* length of the itxt string */  |
589 | png_charp lang; /* language code, 0-79 characters  |
590 | or a NULL pointer */  |
591 | png_charp lang_key; /* keyword translated UTF-8 string, 0 or more  |
592 | chars or a NULL pointer */  |
593 | } png_text;  |
594 | typedef png_text * png_textp;  |
595 | typedef const png_text * png_const_textp;  |
596 | typedef png_text * * png_textpp;  |
597 | #endif  |
598 |   |
599 | /* Supported compression types for text in PNG files (tEXt, and zTXt).  |
600 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */  |
601 | #define PNG_TEXT_COMPRESSION_NONE_WR -3  |
602 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2  |
603 | #define PNG_TEXT_COMPRESSION_NONE -1  |
604 | #define PNG_TEXT_COMPRESSION_zTXt 0  |
605 | #define PNG_ITXT_COMPRESSION_NONE 1  |
606 | #define PNG_ITXT_COMPRESSION_zTXt 2  |
607 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */  |
608 |   |
609 | /* png_time is a way to hold the time in an machine independent way.  |
610 | * Two conversions are provided, both from time_t and struct tm. There  |
611 | * is no portable way to convert to either of these structures, as far  |
612 | * as I know. If you know of a portable way, send it to me. As a side  |
613 | * note - PNG has always been Year 2000 compliant!  |
614 | */  |
615 | typedef struct png_time_struct  |
616 | {  |
617 | png_uint_16 year; /* full year, as in, 1995 */  |
618 | png_byte month; /* month of year, 1 - 12 */  |
619 | png_byte day; /* day of month, 1 - 31 */  |
620 | png_byte hour; /* hour of day, 0 - 23 */  |
621 | png_byte minute; /* minute of hour, 0 - 59 */  |
622 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */  |
623 | } png_time;  |
624 | typedef png_time * png_timep;  |
625 | typedef const png_time * png_const_timep;  |
626 | typedef png_time * * png_timepp;  |
627 |   |
628 | #if defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) ||\  |
629 | defined(PNG_USER_CHUNKS_SUPPORTED)  |
630 | /* png_unknown_chunk is a structure to hold queued chunks for which there is  |
631 | * no specific support. The idea is that we can use this to queue  |
632 | * up private chunks for output even though the library doesn't actually  |
633 | * know about their semantics.  |
634 | *  |
635 | * The data in the structure is set by libpng on read and used on write.  |
636 | */  |
637 | typedef struct png_unknown_chunk_t  |
638 | {  |
639 | png_byte name[5]; /* Textual chunk name with '\0' terminator */  |
640 | png_byte *data; /* Data, should not be modified on read! */  |
641 | size_t size;  |
642 |   |
643 | /* On write 'location' must be set using the flag values listed below.  |
644 | * Notice that on read it is set by libpng however the values stored have  |
645 | * more bits set than are listed below. Always treat the value as a  |
646 | * bitmask. On write set only one bit - setting multiple bits may cause the  |
647 | * chunk to be written in multiple places.  |
648 | */  |
649 | png_byte location; /* mode of operation at read time */  |
650 | }  |
651 | png_unknown_chunk;  |
652 |   |
653 | typedef png_unknown_chunk * png_unknown_chunkp;  |
654 | typedef const png_unknown_chunk * png_const_unknown_chunkp;  |
655 | typedef png_unknown_chunk * * png_unknown_chunkpp;  |
656 | #endif  |
657 |   |
658 | /* Flag values for the unknown chunk location byte. */  |
659 | #define PNG_HAVE_IHDR 0x01  |
660 | #define PNG_HAVE_PLTE 0x02  |
661 | #define PNG_AFTER_IDAT 0x08  |
662 |   |
663 | /* Maximum positive integer used in PNG is (2^31)-1 */  |
664 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)  |
665 | #define PNG_UINT_32_MAX ((png_uint_32)(-1))  |
666 | #define PNG_SIZE_MAX ((size_t)(-1))  |
667 |   |
668 | /* These are constants for fixed point values encoded in the  |
669 | * PNG specification manner (x100000)  |
670 | */  |
671 | #define PNG_FP_1 100000  |
672 | #define PNG_FP_HALF 50000  |
673 | #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL)  |
674 | #define PNG_FP_MIN (-PNG_FP_MAX)  |
675 |   |
676 | /* These describe the color_type field in png_info. */  |
677 | /* color type masks */  |
678 | #define PNG_COLOR_MASK_PALETTE 1  |
679 | #define PNG_COLOR_MASK_COLOR 2  |
680 | #define PNG_COLOR_MASK_ALPHA 4  |
681 |   |
682 | /* color types. Note that not all combinations are legal */  |
683 | #define PNG_COLOR_TYPE_GRAY 0  |
684 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)  |
685 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)  |
686 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)  |
687 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)  |
688 | /* aliases */  |
689 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA  |
690 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA  |
691 |   |
692 | /* This is for compression type. PNG 1.0-1.2 only define the single type. */  |
693 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */  |
694 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE  |
695 |   |
696 | /* This is for filter type. PNG 1.0-1.2 only define the single type. */  |
697 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */  |
698 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */  |
699 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE  |
700 |   |
701 | /* These are for the interlacing type. These values should NOT be changed. */  |
702 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */  |
703 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */  |
704 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */  |
705 |   |
706 | /* These are for the oFFs chunk. These values should NOT be changed. */  |
707 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */  |
708 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */  |
709 | #define PNG_OFFSET_LAST 2 /* Not a valid value */  |
710 |   |
711 | /* These are for the pCAL chunk. These values should NOT be changed. */  |
712 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */  |
713 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */  |
714 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */  |
715 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */  |
716 | #define PNG_EQUATION_LAST 4 /* Not a valid value */  |
717 |   |
718 | /* These are for the sCAL chunk. These values should NOT be changed. */  |
719 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */  |
720 | #define PNG_SCALE_METER 1 /* meters per pixel */  |
721 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */  |
722 | #define PNG_SCALE_LAST 3 /* Not a valid value */  |
723 |   |
724 | /* These are for the pHYs chunk. These values should NOT be changed. */  |
725 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */  |
726 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */  |
727 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */  |
728 |   |
729 | /* These are for the sRGB chunk. These values should NOT be changed. */  |
730 | #define PNG_sRGB_INTENT_PERCEPTUAL 0  |
731 | #define PNG_sRGB_INTENT_RELATIVE 1  |
732 | #define PNG_sRGB_INTENT_SATURATION 2  |
733 | #define PNG_sRGB_INTENT_ABSOLUTE 3  |
734 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */  |
735 |   |
736 | /* This is for text chunks */  |
737 | #define PNG_KEYWORD_MAX_LENGTH 79  |
738 |   |
739 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */  |
740 | #define PNG_MAX_PALETTE_LENGTH 256  |
741 |   |
742 | /* These determine if an ancillary chunk's data has been successfully read  |
743 | * from the PNG header, or if the application has filled in the corresponding  |
744 | * data in the info_struct to be written into the output file. The values  |
745 | * of the PNG_INFO_<chunk> defines should NOT be changed.  |
746 | */  |
747 | #define PNG_INFO_gAMA 0x0001U  |
748 | #define PNG_INFO_sBIT 0x0002U  |
749 | #define PNG_INFO_cHRM 0x0004U  |
750 | #define PNG_INFO_PLTE 0x0008U  |
751 | #define PNG_INFO_tRNS 0x0010U  |
752 | #define PNG_INFO_bKGD 0x0020U  |
753 | #define PNG_INFO_hIST 0x0040U  |
754 | #define PNG_INFO_pHYs 0x0080U  |
755 | #define PNG_INFO_oFFs 0x0100U  |
756 | #define PNG_INFO_tIME 0x0200U  |
757 | #define PNG_INFO_pCAL 0x0400U  |
758 | #define PNG_INFO_sRGB 0x0800U /* GR-P, 0.96a */  |
759 | #define PNG_INFO_iCCP 0x1000U /* ESR, 1.0.6 */  |
760 | #define PNG_INFO_sPLT 0x2000U /* ESR, 1.0.6 */  |
761 | #define PNG_INFO_sCAL 0x4000U /* ESR, 1.0.6 */  |
762 | #define PNG_INFO_IDAT 0x8000U /* ESR, 1.0.6 */  |
763 | #define PNG_INFO_eXIf 0x10000U /* GR-P, 1.6.31 */  |
764 | #ifdef PNG_APNG_SUPPORTED  |
765 | #define PNG_INFO_acTL 0x20000U  |
766 | #define PNG_INFO_fcTL 0x40000U  |
767 | #endif  |
768 |   |
769 | /* This is used for the transformation routines, as some of them  |
770 | * change these values for the row. It also should enable using  |
771 | * the routines for other purposes.  |
772 | */  |
773 | typedef struct png_row_info_struct  |
774 | {  |
775 | png_uint_32 width; /* width of row */  |
776 | size_t rowbytes; /* number of bytes in row */  |
777 | png_byte color_type; /* color type of row */  |
778 | png_byte bit_depth; /* bit depth of row */  |
779 | png_byte channels; /* number of channels (1, 2, 3, or 4) */  |
780 | png_byte pixel_depth; /* bits per pixel (depth * channels) */  |
781 | } png_row_info;  |
782 |   |
783 | typedef png_row_info * png_row_infop;  |
784 | typedef png_row_info * * png_row_infopp;  |
785 |   |
786 | /* These are the function types for the I/O functions and for the functions  |
787 | * that allow the user to override the default I/O functions with his or her  |
788 | * own. The png_error_ptr type should match that of user-supplied warning  |
789 | * and error functions, while the png_rw_ptr type should match that of the  |
790 | * user read/write data functions. Note that the 'write' function must not  |
791 | * modify the buffer it is passed. The 'read' function, on the other hand, is  |
792 | * expected to return the read data in the buffer.  |
793 | */  |
794 | typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));  |
795 | typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, size_t));  |
796 | typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));  |
797 | typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,  |
798 | int));  |
799 | typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,  |
800 | int));  |
801 |   |
802 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED  |
803 | typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));  |
804 | typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));  |
805 | #ifdef PNG_APNG_SUPPORTED  |
806 | typedef PNG_CALLBACK(void, *png_progressive_frame_ptr, (png_structp,  |
807 | png_uint_32));  |
808 | #endif  |
809 |   |
810 | /* The following callback receives png_uint_32 row_number, int pass for the  |
811 | * png_bytep data of the row. When transforming an interlaced image the  |
812 | * row number is the row number within the sub-image of the interlace pass, so  |
813 | * the value will increase to the height of the sub-image (not the full image)  |
814 | * then reset to 0 for the next pass.  |
815 | *  |
816 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to  |
817 | * find the output pixel (x,y) given an interlaced sub-image pixel  |
818 | * (row,col,pass). (See below for these macros.)  |
819 | */  |
820 | typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,  |
821 | png_uint_32, int));  |
822 | #endif  |
823 |   |
824 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \  |
825 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)  |
826 | typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,  |
827 | png_bytep));  |
828 | #endif  |
829 |   |
830 | #ifdef PNG_USER_CHUNKS_SUPPORTED  |
831 | typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,  |
832 | png_unknown_chunkp));  |
833 | #endif  |
834 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED  |
835 | /* not used anywhere */  |
836 | /* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */  |
837 | #endif  |
838 |   |
839 | #ifdef PNG_SETJMP_SUPPORTED  |
840 | /* This must match the function definition in <setjmp.h>, and the application  |
841 | * must include this before png.h to obtain the definition of jmp_buf. The  |
842 | * function is required to be PNG_NORETURN, but this is not checked. If the  |
843 | * function does return the application will crash via an abort() or similar  |
844 | * system level call.  |
845 | *  |
846 | * If you get a warning here while building the library you may need to make  |
847 | * changes to ensure that pnglibconf.h records the calling convention used by  |
848 | * your compiler. This may be very difficult - try using a different compiler  |
849 | * to build the library!  |
850 | */  |
851 | PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);  |
852 | #endif  |
853 |   |
854 | /* Transform masks for the high-level interface */  |
855 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */  |
856 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */  |
857 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */  |
858 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */  |
859 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */  |
860 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */  |
861 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */  |
862 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */  |
863 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */  |
864 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */  |
865 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */  |
866 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */  |
867 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */  |
868 | /* Added to libpng-1.2.34 */  |
869 | #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER  |
870 | #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */  |
871 | /* Added to libpng-1.4.0 */  |
872 | #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */  |
873 | /* Added to libpng-1.5.4 */  |
874 | #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */  |
875 | #if INT_MAX >= 0x8000 /* else this might break */  |
876 | #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */  |
877 | #endif  |
878 |   |
879 | /* Flags for MNG supported features */  |
880 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01  |
881 | #define PNG_FLAG_MNG_FILTER_64 0x04  |
882 | #define PNG_ALL_MNG_FEATURES 0x05  |
883 |   |
884 | /* NOTE: prior to 1.5 these functions had no 'API' style declaration,  |
885 | * this allowed the zlib default functions to be used on Windows  |
886 | * platforms. In 1.5 the zlib default malloc (which just calls malloc and  |
887 | * ignores the first argument) should be completely compatible with the  |
888 | * following.  |
889 | */  |
890 | typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,  |
891 | png_alloc_size_t));  |
892 | typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));  |
893 |   |
894 | /* Section 4: exported functions  |
895 | * Here are the function definitions most commonly used. This is not  |
896 | * the place to find out how to use libpng. See libpng-manual.txt for the  |
897 | * full explanation, see example.c for the summary. This just provides  |
898 | * a simple one line description of the use of each function.  |
899 | *  |
900 | * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in  |
901 | * pngconf.h and in the *.dfn files in the scripts directory.  |
902 | *  |
903 | * PNG_EXPORT(ordinal, type, name, (args));  |
904 | *  |
905 | * ordinal: ordinal that is used while building  |
906 | * *.def files. The ordinal value is only  |
907 | * relevant when preprocessing png.h with  |
908 | * the *.dfn files for building symbol table  |
909 | * entries, and are removed by pngconf.h.  |
910 | * type: return type of the function  |
911 | * name: function name  |
912 | * args: function arguments, with types  |
913 | *  |
914 | * When we wish to append attributes to a function prototype we use  |
915 | * the PNG_EXPORTA() macro instead.  |
916 | *  |
917 | * PNG_EXPORTA(ordinal, type, name, (args), attributes);  |
918 | *  |
919 | * ordinal, type, name, and args: same as in PNG_EXPORT().  |
920 | * attributes: function attributes  |
921 | */  |
922 |   |
923 | /* Returns the version number of the library */  |
924 | PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));  |
925 |   |
926 | /* Tell lib we have already handled the first <num_bytes> magic bytes.  |
927 | * Handling more than 8 bytes from the beginning of the file is an error.  |
928 | */  |
929 | PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes));  |
930 |   |
931 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a  |
932 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG  |
933 | * signature, and non-zero otherwise. Having num_to_check == 0 or  |
934 | * start > 7 will always fail (ie return non-zero).  |
935 | */  |
936 | PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, size_t start,  |
937 | size_t num_to_check));  |
938 |   |
939 | /* Simple signature checking function. This is the same as calling  |
940 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).  |
941 | */  |
942 | #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))  |
943 |   |
944 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */  |
945 | PNG_EXPORTA(4, png_structp, png_create_read_struct,  |
946 | (png_const_charp user_png_ver, png_voidp error_ptr,  |
947 | png_error_ptr error_fn, png_error_ptr warn_fn),  |
948 | PNG_ALLOCATED);  |
949 |   |
950 | /* Allocate and initialize png_ptr struct for writing, and any other memory */  |
951 | PNG_EXPORTA(5, png_structp, png_create_write_struct,  |
952 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,  |
953 | png_error_ptr warn_fn),  |
954 | PNG_ALLOCATED);  |
955 |   |
956 | PNG_EXPORT(6, size_t, png_get_compression_buffer_size,  |
957 | (png_const_structrp png_ptr));  |
958 |   |
959 | PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr,  |
960 | size_t size));  |
961 |   |
962 | /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp  |
963 | * match up.  |
964 | */  |
965 | #ifdef PNG_SETJMP_SUPPORTED  |
966 | /* This function returns the jmp_buf built in to *png_ptr. It must be  |
967 | * supplied with an appropriate 'longjmp' function to use on that jmp_buf  |
968 | * unless the default error function is overridden in which case NULL is  |
969 | * acceptable. The size of the jmp_buf is checked against the actual size  |
970 | * allocated by the library - the call will return NULL on a mismatch  |
971 | * indicating an ABI mismatch.  |
972 | */  |
973 | PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr,  |
974 | png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));  |
975 | # define png_jmpbuf(png_ptr) \  |
976 | (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf))))  |
977 | #else  |
978 | # define png_jmpbuf(png_ptr) \  |
979 | (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)  |
980 | #endif  |
981 | /* This function should be used by libpng applications in place of  |
982 | * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it  |
983 | * will use it; otherwise it will call PNG_ABORT(). This function was  |
984 | * added in libpng-1.5.0.  |
985 | */  |
986 | PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val),  |
987 | PNG_NORETURN);  |
988 |   |
989 | #ifdef PNG_READ_SUPPORTED  |
990 | /* Reset the compression stream */  |
991 | PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED);  |
992 | #endif  |
993 |   |
994 | /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */  |
995 | #ifdef PNG_USER_MEM_SUPPORTED  |
996 | PNG_EXPORTA(11, png_structp, png_create_read_struct_2,  |
997 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,  |
998 | png_error_ptr warn_fn,  |
999 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),  |
1000 | PNG_ALLOCATED);  |
1001 | PNG_EXPORTA(12, png_structp, png_create_write_struct_2,  |
1002 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,  |
1003 | png_error_ptr warn_fn,  |
1004 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),  |
1005 | PNG_ALLOCATED);  |
1006 | #endif  |
1007 |   |
1008 | /* Write the PNG file signature. */  |
1009 | PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr));  |
1010 |   |
1011 | /* Write a PNG chunk - size, type, (optional) data, CRC. */  |
1012 | PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep  |
1013 | chunk_name, png_const_bytep data, size_t length));  |
1014 |   |
1015 | /* Write the start of a PNG chunk - length and chunk name. */  |
1016 | PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr,  |
1017 | png_const_bytep chunk_name, png_uint_32 length));  |
1018 |   |
1019 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */  |
1020 | PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr,  |
1021 | png_const_bytep data, size_t length));  |
1022 |   |
1023 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */  |
1024 | PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr));  |
1025 |   |
1026 | /* Allocate and initialize the info structure */  |
1027 | PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr),  |
1028 | PNG_ALLOCATED);  |
1029 |   |
1030 | /* DEPRECATED: this function allowed init structures to be created using the  |
1031 | * default allocation method (typically malloc). Use is deprecated in 1.6.0 and  |
1032 | * the API will be removed in the future.  |
1033 | */  |
1034 | PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr,  |
1035 | size_t png_info_struct_size), PNG_DEPRECATED);  |
1036 |   |
1037 | /* Writes all the PNG information before the image. */  |
1038 | PNG_EXPORT(20, void, png_write_info_before_PLTE,  |
1039 | (png_structrp png_ptr, png_const_inforp info_ptr));  |
1040 | PNG_EXPORT(21, void, png_write_info,  |
1041 | (png_structrp png_ptr, png_const_inforp info_ptr));  |
1042 |   |
1043 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
1044 | /* Read the information before the actual image data. */  |
1045 | PNG_EXPORT(22, void, png_read_info,  |
1046 | (png_structrp png_ptr, png_inforp info_ptr));  |
1047 | #endif  |
1048 |   |
1049 | #ifdef PNG_TIME_RFC1123_SUPPORTED  |
1050 | /* Convert to a US string format: there is no localization support in this  |
1051 | * routine. The original implementation used a 29 character buffer in  |
1052 | * png_struct, this will be removed in future versions.  |
1053 | */  |
1054 | #if PNG_LIBPNG_VER < 10700  |
1055 | /* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */  |
1056 | PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr,  |
1057 | png_const_timep ptime),PNG_DEPRECATED);  |
1058 | #endif  |
1059 | PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29],  |
1060 | png_const_timep ptime));  |
1061 | #endif  |
1062 |   |
1063 | #ifdef PNG_CONVERT_tIME_SUPPORTED  |
1064 | /* Convert from a struct tm to png_time */  |
1065 | PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,  |
1066 | const struct tm * ttime));  |
1067 |   |
1068 | /* Convert from time_t to png_time. Uses gmtime() */  |
1069 | PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime));  |
1070 | #endif /* CONVERT_tIME */  |
1071 |   |
1072 | #ifdef PNG_READ_EXPAND_SUPPORTED  |
1073 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */  |
1074 | PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr));  |
1075 | PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr));  |
1076 | PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr));  |
1077 | PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr));  |
1078 | #endif  |
1079 |   |
1080 | #ifdef PNG_READ_EXPAND_16_SUPPORTED  |
1081 | /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion  |
1082 | * of a tRNS chunk if present.  |
1083 | */  |
1084 | PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr));  |
1085 | #endif  |
1086 |   |
1087 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)  |
1088 | /* Use blue, green, red order for pixels. */  |
1089 | PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr));  |
1090 | #endif  |
1091 |   |
1092 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED  |
1093 | /* Expand the grayscale to 24-bit RGB if necessary. */  |
1094 | PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr));  |
1095 | #endif  |
1096 |   |
1097 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED  |
1098 | /* Reduce RGB to grayscale. */  |
1099 | #define PNG_ERROR_ACTION_NONE 1  |
1100 | #define PNG_ERROR_ACTION_WARN 2  |
1101 | #define PNG_ERROR_ACTION_ERROR 3  |
1102 | #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/  |
1103 |   |
1104 | PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr,  |
1105 | int error_action, double red, double green))  |
1106 | PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr,  |
1107 | int error_action, png_fixed_point red, png_fixed_point green))  |
1108 |   |
1109 | PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp  |
1110 | png_ptr));  |
1111 | #endif  |
1112 |   |
1113 | #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED  |
1114 | PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,  |
1115 | png_colorp palette));  |
1116 | #endif  |
1117 |   |
1118 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED  |
1119 | /* How the alpha channel is interpreted - this affects how the color channels  |
1120 | * of a PNG file are returned to the calling application when an alpha channel,  |
1121 | * or a tRNS chunk in a palette file, is present.  |
1122 | *  |
1123 | * This has no effect on the way pixels are written into a PNG output  |
1124 | * datastream. The color samples in a PNG datastream are never premultiplied  |
1125 | * with the alpha samples.  |
1126 | *  |
1127 | * The default is to return data according to the PNG specification: the alpha  |
1128 | * channel is a linear measure of the contribution of the pixel to the  |
1129 | * corresponding composited pixel, and the color channels are unassociated  |
1130 | * (not premultiplied). The gamma encoded color channels must be scaled  |
1131 | * according to the contribution and to do this it is necessary to undo  |
1132 | * the encoding, scale the color values, perform the composition and re-encode  |
1133 | * the values. This is the 'PNG' mode.  |
1134 | *  |
1135 | * The alternative is to 'associate' the alpha with the color information by  |
1136 | * storing color channel values that have been scaled by the alpha.  |
1137 | * image. These are the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' modes  |
1138 | * (the latter being the two common names for associated alpha color channels).  |
1139 | *  |
1140 | * For the 'OPTIMIZED' mode, a pixel is treated as opaque only if the alpha  |
1141 | * value is equal to the maximum value.  |
1142 | *  |
1143 | * The final choice is to gamma encode the alpha channel as well. This is  |
1144 | * broken because, in practice, no implementation that uses this choice  |
1145 | * correctly undoes the encoding before handling alpha composition. Use this  |
1146 | * choice only if other serious errors in the software or hardware you use  |
1147 | * mandate it; the typical serious error is for dark halos to appear around  |
1148 | * opaque areas of the composited PNG image because of arithmetic overflow.  |
1149 | *  |
1150 | * The API function png_set_alpha_mode specifies which of these choices to use  |
1151 | * with an enumerated 'mode' value and the gamma of the required output:  |
1152 | */  |
1153 | #define PNG_ALPHA_PNG 0 /* according to the PNG standard */  |
1154 | #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */  |
1155 | #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */  |
1156 | #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */  |
1157 | #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */  |
1158 | #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */  |
1159 |   |
1160 | PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode,  |
1161 | double output_gamma))  |
1162 | PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr,  |
1163 | int mode, png_fixed_point output_gamma))  |
1164 | #endif  |
1165 |   |
1166 | #if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)  |
1167 | /* The output_gamma value is a screen gamma in libpng terminology: it expresses  |
1168 | * how to decode the output values, not how they are encoded.  |
1169 | */  |
1170 | #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */  |
1171 | #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */  |
1172 | #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */  |
1173 | #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */  |
1174 | #endif  |
1175 |   |
1176 | /* The following are examples of calls to png_set_alpha_mode to achieve the  |
1177 | * required overall gamma correction and, where necessary, alpha  |
1178 | * premultiplication.  |
1179 | *  |
1180 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);  |
1181 | * This is the default libpng handling of the alpha channel - it is not  |
1182 | * pre-multiplied into the color components. In addition the call states  |
1183 | * that the output is for a sRGB system and causes all PNG files without gAMA  |
1184 | * chunks to be assumed to be encoded using sRGB.  |
1185 | *  |
1186 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);  |
1187 | * In this case the output is assumed to be something like an sRGB conformant  |
1188 | * display preceded by a power-law lookup table of power 1.45. This is how  |
1189 | * early Mac systems behaved.  |
1190 | *  |
1191 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);  |
1192 | * This is the classic Jim Blinn approach and will work in academic  |
1193 | * environments where everything is done by the book. It has the shortcoming  |
1194 | * of assuming that input PNG data with no gamma information is linear - this  |
1195 | * is unlikely to be correct unless the PNG files where generated locally.  |
1196 | * Most of the time the output precision will be so low as to show  |
1197 | * significant banding in dark areas of the image.  |
1198 | *  |
1199 | * png_set_expand_16(pp);  |
1200 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);  |
1201 | * This is a somewhat more realistic Jim Blinn inspired approach. PNG files  |
1202 | * are assumed to have the sRGB encoding if not marked with a gamma value and  |
1203 | * the output is always 16 bits per component. This permits accurate scaling  |
1204 | * and processing of the data. If you know that your input PNG files were  |
1205 | * generated locally you might need to replace PNG_DEFAULT_sRGB with the  |
1206 | * correct value for your system.  |
1207 | *  |
1208 | * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);  |
1209 | * If you just need to composite the PNG image onto an existing background  |
1210 | * and if you control the code that does this you can use the optimization  |
1211 | * setting. In this case you just copy completely opaque pixels to the  |
1212 | * output. For pixels that are not completely transparent (you just skip  |
1213 | * those) you do the composition math using png_composite or png_composite_16  |
1214 | * below then encode the resultant 8-bit or 16-bit values to match the output  |
1215 | * encoding.  |
1216 | *  |
1217 | * Other cases  |
1218 | * If neither the PNG nor the standard linear encoding work for you because  |
1219 | * of the software or hardware you use then you have a big problem. The PNG  |
1220 | * case will probably result in halos around the image. The linear encoding  |
1221 | * will probably result in a washed out, too bright, image (it's actually too  |
1222 | * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably  |
1223 | * substantially reduce the halos. Alternatively try:  |
1224 | *  |
1225 | * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);  |
1226 | * This option will also reduce the halos, but there will be slight dark  |
1227 | * halos round the opaque parts of the image where the background is light.  |
1228 | * In the OPTIMIZED mode the halos will be light halos where the background  |
1229 | * is dark. Take your pick - the halos are unavoidable unless you can get  |
1230 | * your hardware/software fixed! (The OPTIMIZED approach is slightly  |
1231 | * faster.)  |
1232 | *  |
1233 | * When the default gamma of PNG files doesn't match the output gamma.  |
1234 | * If you have PNG files with no gamma information png_set_alpha_mode allows  |
1235 | * you to provide a default gamma, but it also sets the output gamma to the  |
1236 | * matching value. If you know your PNG files have a gamma that doesn't  |
1237 | * match the output you can take advantage of the fact that  |
1238 | * png_set_alpha_mode always sets the output gamma but only sets the PNG  |
1239 | * default if it is not already set:  |
1240 | *  |
1241 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);  |
1242 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);  |
1243 | * The first call sets both the default and the output gamma values, the  |
1244 | * second call overrides the output gamma without changing the default. This  |
1245 | * is easier than achieving the same effect with png_set_gamma. You must use  |
1246 | * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will  |
1247 | * fire if more than one call to png_set_alpha_mode and png_set_background is  |
1248 | * made in the same read operation, however multiple calls with PNG_ALPHA_PNG  |
1249 | * are ignored.  |
1250 | */  |
1251 |   |
1252 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED  |
1253 | PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr));  |
1254 | #endif  |
1255 |   |
1256 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \  |
1257 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)  |
1258 | PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr));  |
1259 | #endif  |
1260 |   |
1261 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \  |
1262 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)  |
1263 | PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr));  |
1264 | #endif  |
1265 |   |
1266 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)  |
1267 | /* Add a filler byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */  |
1268 | PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler,  |
1269 | int flags));  |
1270 | /* The values of the PNG_FILLER_ defines should NOT be changed */  |
1271 | # define PNG_FILLER_BEFORE 0  |
1272 | # define PNG_FILLER_AFTER 1  |
1273 | /* Add an alpha byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */  |
1274 | PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr,  |
1275 | png_uint_32 filler, int flags));  |
1276 | #endif /* READ_FILLER || WRITE_FILLER */  |
1277 |   |
1278 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)  |
1279 | /* Swap bytes in 16-bit depth files. */  |
1280 | PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr));  |
1281 | #endif  |
1282 |   |
1283 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)  |
1284 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */  |
1285 | PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr));  |
1286 | #endif  |
1287 |   |
1288 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \  |
1289 | defined(PNG_WRITE_PACKSWAP_SUPPORTED)  |
1290 | /* Swap packing order of pixels in bytes. */  |
1291 | PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr));  |
1292 | #endif  |
1293 |   |
1294 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)  |
1295 | /* Converts files to legal bit depths. */  |
1296 | PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p  |
1297 | true_bits));  |
1298 | #endif  |
1299 |   |
1300 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \  |
1301 | defined(PNG_WRITE_INTERLACING_SUPPORTED)  |
1302 | /* Have the code handle the interlacing. Returns the number of passes.  |
1303 | * MUST be called before png_read_update_info or png_start_read_image,  |
1304 | * otherwise it will not have the desired effect. Note that it is still  |
1305 | * necessary to call png_read_row or png_read_rows png_get_image_height  |
1306 | * times for each pass.  |
1307 | */  |
1308 | PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr));  |
1309 | #endif  |
1310 |   |
1311 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)  |
1312 | /* Invert monochrome files */  |
1313 | PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr));  |
1314 | #endif  |
1315 |   |
1316 | #ifdef PNG_READ_BACKGROUND_SUPPORTED  |
1317 | /* Handle alpha and tRNS by replacing with a background color. Prior to  |
1318 | * libpng-1.5.4 this API must not be called before the PNG file header has been  |
1319 | * read. Doing so will result in unexpected behavior and possible warnings or  |
1320 | * errors if the PNG file contains a bKGD chunk.  |
1321 | */  |
1322 | PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr,  |
1323 | png_const_color_16p background_color, int background_gamma_code,  |
1324 | int need_expand, double background_gamma))  |
1325 | PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr,  |
1326 | png_const_color_16p background_color, int background_gamma_code,  |
1327 | int need_expand, png_fixed_point background_gamma))  |
1328 | #endif  |
1329 | #ifdef PNG_READ_BACKGROUND_SUPPORTED  |
1330 | # define PNG_BACKGROUND_GAMMA_UNKNOWN 0  |
1331 | # define PNG_BACKGROUND_GAMMA_SCREEN 1  |
1332 | # define PNG_BACKGROUND_GAMMA_FILE 2  |
1333 | # define PNG_BACKGROUND_GAMMA_UNIQUE 3  |
1334 | #endif  |
1335 |   |
1336 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED  |
1337 | /* Scale a 16-bit depth file down to 8-bit, accurately. */  |
1338 | PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr));  |
1339 | #endif  |
1340 |   |
1341 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED  |
1342 | #define PNG_READ_16_TO_8_SUPPORTED /* Name prior to 1.5.4 */  |
1343 | /* Strip the second byte of information from a 16-bit depth file. */  |
1344 | PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr));  |
1345 | #endif  |
1346 |   |
1347 | #ifdef PNG_READ_QUANTIZE_SUPPORTED  |
1348 | /* Turn on quantizing, and reduce the palette to the number of colors  |
1349 | * available.  |
1350 | */  |
1351 | PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr,  |
1352 | png_colorp palette, int num_palette, int maximum_colors,  |
1353 | png_const_uint_16p histogram, int full_quantize));  |
1354 | #endif  |
1355 |   |
1356 | #ifdef PNG_READ_GAMMA_SUPPORTED  |
1357 | /* The threshold on gamma processing is configurable but hard-wired into the  |
1358 | * library. The following is the floating point variant.  |
1359 | */  |
1360 | #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)  |
1361 |   |
1362 | /* Handle gamma correction. Screen_gamma=(display_exponent).  |
1363 | * NOTE: this API simply sets the screen and file gamma values. It will  |
1364 | * therefore override the value for gamma in a PNG file if it is called after  |
1365 | * the file header has been read - use with care - call before reading the PNG  |
1366 | * file for best results!  |
1367 | *  |
1368 | * These routines accept the same gamma values as png_set_alpha_mode (described  |
1369 | * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either  |
1370 | * API (floating point or fixed.) Notice, however, that the 'file_gamma' value  |
1371 | * is the inverse of a 'screen gamma' value.  |
1372 | */  |
1373 | PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr,  |
1374 | double screen_gamma, double override_file_gamma))  |
1375 | PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr,  |
1376 | png_fixed_point screen_gamma, png_fixed_point override_file_gamma))  |
1377 | #endif  |
1378 |   |
1379 | #ifdef PNG_WRITE_FLUSH_SUPPORTED  |
1380 | /* Set how many lines between output flushes - 0 for no flushing */  |
1381 | PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows));  |
1382 | /* Flush the current PNG output buffer */  |
1383 | PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr));  |
1384 | #endif  |
1385 |   |
1386 | /* Optional update palette with requested transformations */  |
1387 | PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr));  |
1388 |   |
1389 | /* Optional call to update the users info structure */  |
1390 | PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr,  |
1391 | png_inforp info_ptr));  |
1392 |   |
1393 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
1394 | /* Read one or more rows of image data. */  |
1395 | PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row,  |
1396 | png_bytepp display_row, png_uint_32 num_rows));  |
1397 | #endif  |
1398 |   |
1399 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
1400 | /* Read a row of data. */  |
1401 | PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row,  |
1402 | png_bytep display_row));  |
1403 | #endif  |
1404 |   |
1405 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
1406 | /* Read the whole image into memory at once. */  |
1407 | PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image));  |
1408 | #endif  |
1409 |   |
1410 | /* Write a row of image data */  |
1411 | PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr,  |
1412 | png_const_bytep row));  |
1413 |   |
1414 | /* Write a few rows of image data: (*row) is not written; however, the type  |
1415 | * is declared as writeable to maintain compatibility with previous versions  |
1416 | * of libpng and to allow the 'display_row' array from read_rows to be passed  |
1417 | * unchanged to write_rows.  |
1418 | */  |
1419 | PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row,  |
1420 | png_uint_32 num_rows));  |
1421 |   |
1422 | /* Write the image data */  |
1423 | PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image));  |
1424 |   |
1425 | /* Write the end of the PNG file. */  |
1426 | PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr,  |
1427 | png_inforp info_ptr));  |
1428 |   |
1429 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
1430 | /* Read the end of the PNG file. */  |
1431 | PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr));  |
1432 | #endif  |
1433 |   |
1434 | /* Free any memory associated with the png_info_struct */  |
1435 | PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr,  |
1436 | png_infopp info_ptr_ptr));  |
1437 |   |
1438 | /* Free any memory associated with the png_struct and the png_info_structs */  |
1439 | PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,  |
1440 | png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));  |
1441 |   |
1442 | /* Free any memory associated with the png_struct and the png_info_structs */  |
1443 | PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,  |
1444 | png_infopp info_ptr_ptr));  |
1445 |   |
1446 | /* Set the libpng method of handling chunk CRC errors */  |
1447 | PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action,  |
1448 | int ancil_action));  |
1449 |   |
1450 | /* Values for png_set_crc_action() say how to handle CRC errors in  |
1451 | * ancillary and critical chunks, and whether to use the data contained  |
1452 | * therein. Note that it is impossible to "discard" data in a critical  |
1453 | * chunk. For versions prior to 0.90, the action was always error/quit,  |
1454 | * whereas in version 0.90 and later, the action for CRC errors in ancillary  |
1455 | * chunks is warn/discard. These values should NOT be changed.  |
1456 | *  |
1457 | * value action:critical action:ancillary  |
1458 | */  |
1459 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */  |
1460 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */  |
1461 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */  |
1462 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */  |
1463 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */  |
1464 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */  |
1465 |   |
1466 | #ifdef PNG_WRITE_SUPPORTED  |
1467 | /* These functions give the user control over the scan-line filtering in  |
1468 | * libpng and the compression methods used by zlib. These functions are  |
1469 | * mainly useful for testing, as the defaults should work with most users.  |
1470 | * Those users who are tight on memory or want faster performance at the  |
1471 | * expense of compression can modify them. See the compression library  |
1472 | * header file (zlib.h) for an explination of the compression functions.  |
1473 | */  |
1474 |   |
1475 | /* Set the filtering method(s) used by libpng. Currently, the only valid  |
1476 | * value for "method" is 0.  |
1477 | */  |
1478 | PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method,  |
1479 | int filters));  |
1480 | #endif /* WRITE */  |
1481 |   |
1482 | /* Flags for png_set_filter() to say which filters to use. The flags  |
1483 | * are chosen so that they don't conflict with real filter types  |
1484 | * below, in case they are supplied instead of the #defined constants.  |
1485 | * These values should NOT be changed.  |
1486 | */  |
1487 | #define PNG_NO_FILTERS 0x00  |
1488 | #define PNG_FILTER_NONE 0x08  |
1489 | #define PNG_FILTER_SUB 0x10  |
1490 | #define PNG_FILTER_UP 0x20  |
1491 | #define PNG_FILTER_AVG 0x40  |
1492 | #define PNG_FILTER_PAETH 0x80  |
1493 | #define PNG_FAST_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP)  |
1494 | #define PNG_ALL_FILTERS (PNG_FAST_FILTERS | PNG_FILTER_AVG | PNG_FILTER_PAETH)  |
1495 |   |
1496 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.  |
1497 | * These defines should NOT be changed.  |
1498 | */  |
1499 | #define PNG_FILTER_VALUE_NONE 0  |
1500 | #define PNG_FILTER_VALUE_SUB 1  |
1501 | #define PNG_FILTER_VALUE_UP 2  |
1502 | #define PNG_FILTER_VALUE_AVG 3  |
1503 | #define PNG_FILTER_VALUE_PAETH 4  |
1504 | #define PNG_FILTER_VALUE_LAST 5  |
1505 |   |
1506 | #ifdef PNG_WRITE_SUPPORTED  |
1507 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */  |
1508 | PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr,  |
1509 | int heuristic_method, int num_weights, png_const_doublep filter_weights,  |
1510 | png_const_doublep filter_costs))  |
1511 | PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,  |
1512 | (png_structrp png_ptr, int heuristic_method, int num_weights,  |
1513 | png_const_fixed_point_p filter_weights,  |
1514 | png_const_fixed_point_p filter_costs))  |
1515 | #endif /* WRITE_WEIGHTED_FILTER */  |
1516 |   |
1517 | /* The following are no longer used and will be removed from libpng-1.7: */  |
1518 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */  |
1519 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */  |
1520 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */  |
1521 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */  |
1522 |   |
1523 | /* Set the library compression level. Currently, valid values range from  |
1524 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9  |
1525 | * (0 - no compression, 9 - "maximal" compression). Note that tests have  |
1526 | * shown that zlib compression levels 3-6 usually perform as well as level 9  |
1527 | * for PNG images, and do considerably fewer caclulations. In the future,  |
1528 | * these values may not correspond directly to the zlib compression levels.  |
1529 | */  |
1530 | #ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED  |
1531 | PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr,  |
1532 | int level));  |
1533 |   |
1534 | PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr,  |
1535 | int mem_level));  |
1536 |   |
1537 | PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr,  |
1538 | int strategy));  |
1539 |   |
1540 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a  |
1541 | * smaller value of window_bits if it can do so safely.  |
1542 | */  |
1543 | PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr,  |
1544 | int window_bits));  |
1545 |   |
1546 | PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr,  |
1547 | int method));  |
1548 | #endif /* WRITE_CUSTOMIZE_COMPRESSION */  |
1549 |   |
1550 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED  |
1551 | /* Also set zlib parameters for compressing non-IDAT chunks */  |
1552 | PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr,  |
1553 | int level));  |
1554 |   |
1555 | PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr,  |
1556 | int mem_level));  |
1557 |   |
1558 | PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr,  |
1559 | int strategy));  |
1560 |   |
1561 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a  |
1562 | * smaller value of window_bits if it can do so safely.  |
1563 | */  |
1564 | PNG_EXPORT(225, void, png_set_text_compression_window_bits,  |
1565 | (png_structrp png_ptr, int window_bits));  |
1566 |   |
1567 | PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr,  |
1568 | int method));  |
1569 | #endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */  |
1570 | #endif /* WRITE */  |
1571 |   |
1572 | /* These next functions are called for input/output, memory, and error  |
1573 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,  |
1574 | * and call standard C I/O routines such as fread(), fwrite(), and  |
1575 | * fprintf(). These functions can be made to use other I/O routines  |
1576 | * at run time for those applications that need to handle I/O in a  |
1577 | * different manner by calling png_set_???_fn(). See libpng-manual.txt for  |
1578 | * more information.  |
1579 | */  |
1580 |   |
1581 | #ifdef PNG_STDIO_SUPPORTED  |
1582 | /* Initialize the input/output for the PNG file to the default functions. */  |
1583 | PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp));  |
1584 | #endif  |
1585 |   |
1586 | /* Replace the (error and abort), and warning functions with user  |
1587 | * supplied functions. If no messages are to be printed you must still  |
1588 | * write and use replacement functions. The replacement error_fn should  |
1589 | * still do a longjmp to the last setjmp location if you are using this  |
1590 | * method of error handling. If error_fn or warning_fn is NULL, the  |
1591 | * default function will be used.  |
1592 | */  |
1593 |   |
1594 | PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr,  |
1595 | png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));  |
1596 |   |
1597 | /* Return the user pointer associated with the error functions */  |
1598 | PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr));  |
1599 |   |
1600 | /* Replace the default data output functions with a user supplied one(s).  |
1601 | * If buffered output is not used, then output_flush_fn can be set to NULL.  |
1602 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time  |
1603 | * output_flush_fn will be ignored (and thus can be NULL).  |
1604 | * It is probably a mistake to use NULL for output_flush_fn if  |
1605 | * write_data_fn is not also NULL unless you have built libpng with  |
1606 | * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's  |
1607 | * default flush function, which uses the standard *FILE structure, will  |
1608 | * be used.  |
1609 | */  |
1610 | PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr,  |
1611 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));  |
1612 |   |
1613 | /* Replace the default data input function with a user supplied one. */  |
1614 | PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr,  |
1615 | png_rw_ptr read_data_fn));  |
1616 |   |
1617 | /* Return the user pointer associated with the I/O functions */  |
1618 | PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr));  |
1619 |   |
1620 | PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr,  |
1621 | png_read_status_ptr read_row_fn));  |
1622 |   |
1623 | PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr,  |
1624 | png_write_status_ptr write_row_fn));  |
1625 |   |
1626 | #ifdef PNG_USER_MEM_SUPPORTED  |
1627 | /* Replace the default memory allocation functions with user supplied one(s). */  |
1628 | PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr,  |
1629 | png_malloc_ptr malloc_fn, png_free_ptr free_fn));  |
1630 | /* Return the user pointer associated with the memory functions */  |
1631 | PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr));  |
1632 | #endif  |
1633 |   |
1634 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED  |
1635 | PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr,  |
1636 | png_user_transform_ptr read_user_transform_fn));  |
1637 | #endif  |
1638 |   |
1639 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED  |
1640 | PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr,  |
1641 | png_user_transform_ptr write_user_transform_fn));  |
1642 | #endif  |
1643 |   |
1644 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED  |
1645 | PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr,  |
1646 | png_voidp user_transform_ptr, int user_transform_depth,  |
1647 | int user_transform_channels));  |
1648 | /* Return the user pointer associated with the user transform functions */  |
1649 | PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,  |
1650 | (png_const_structrp png_ptr));  |
1651 | #endif  |
1652 |   |
1653 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED  |
1654 | /* Return information about the row currently being processed. Note that these  |
1655 | * APIs do not fail but will return unexpected results if called outside a user  |
1656 | * transform callback. Also note that when transforming an interlaced image the  |
1657 | * row number is the row number within the sub-image of the interlace pass, so  |
1658 | * the value will increase to the height of the sub-image (not the full image)  |
1659 | * then reset to 0 for the next pass.  |
1660 | *  |
1661 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to  |
1662 | * find the output pixel (x,y) given an interlaced sub-image pixel  |
1663 | * (row,col,pass). (See below for these macros.)  |
1664 | */  |
1665 | PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp));  |
1666 | PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp));  |
1667 | #endif  |
1668 |   |
1669 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED  |
1670 | /* This callback is called only for *unknown* chunks. If  |
1671 | * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known  |
1672 | * chunks to be treated as unknown, however in this case the callback must do  |
1673 | * any processing required by the chunk (e.g. by calling the appropriate  |
1674 | * png_set_ APIs.)  |
1675 | *  |
1676 | * There is no write support - on write, by default, all the chunks in the  |
1677 | * 'unknown' list are written in the specified position.  |
1678 | *  |
1679 | * The integer return from the callback function is interpreted thus:  |
1680 | *  |
1681 | * negative: An error occurred; png_chunk_error will be called.  |
1682 | * zero: The chunk was not handled, the chunk will be saved. A critical  |
1683 | * chunk will cause an error at this point unless it is to be saved.  |
1684 | * positive: The chunk was handled, libpng will ignore/discard it.  |
1685 | *  |
1686 | * See "INTERACTION WITH USER CHUNK CALLBACKS" below for important notes about  |
1687 | * how this behavior will change in libpng 1.7  |
1688 | */  |
1689 | PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr,  |
1690 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));  |
1691 | #endif  |
1692 |   |
1693 | #ifdef PNG_USER_CHUNKS_SUPPORTED  |
1694 | PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr));  |
1695 | #endif  |
1696 |   |
1697 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED  |
1698 | /* Sets the function callbacks for the push reader, and a pointer to a  |
1699 | * user-defined structure available to the callback functions.  |
1700 | */  |
1701 | PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr,  |
1702 | png_voidp progressive_ptr, png_progressive_info_ptr info_fn,  |
1703 | png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));  |
1704 |   |
1705 | /* Returns the user pointer associated with the push read functions */  |
1706 | PNG_EXPORT(91, png_voidp, png_get_progressive_ptr,  |
1707 | (png_const_structrp png_ptr));  |
1708 |   |
1709 | /* Function to be called when data becomes available */  |
1710 | PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr,  |
1711 | png_inforp info_ptr, png_bytep buffer, size_t buffer_size));  |
1712 |   |
1713 | /* A function which may be called *only* within png_process_data to stop the  |
1714 | * processing of any more data. The function returns the number of bytes  |
1715 | * remaining, excluding any that libpng has cached internally. A subsequent  |
1716 | * call to png_process_data must supply these bytes again. If the argument  |
1717 | * 'save' is set to true the routine will first save all the pending data and  |
1718 | * will always return 0.  |
1719 | */  |
1720 | PNG_EXPORT(219, size_t, png_process_data_pause, (png_structrp, int save));  |
1721 |   |
1722 | /* A function which may be called *only* outside (after) a call to  |
1723 | * png_process_data. It returns the number of bytes of data to skip in the  |
1724 | * input. Normally it will return 0, but if it returns a non-zero value the  |
1725 | * application must skip than number of bytes of input data and pass the  |
1726 | * following data to the next call to png_process_data.  |
1727 | */  |
1728 | PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp));  |
1729 |   |
1730 | /* Function that combines rows. 'new_row' is a flag that should come from  |
1731 | * the callback and be non-NULL if anything needs to be done; the library  |
1732 | * stores its own version of the new data internally and ignores the passed  |
1733 | * in value.  |
1734 | */  |
1735 | PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr,  |
1736 | png_bytep old_row, png_const_bytep new_row));  |
1737 | #endif /* PROGRESSIVE_READ */  |
1738 |   |
1739 | PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr,  |
1740 | png_alloc_size_t size), PNG_ALLOCATED);  |
1741 | /* Added at libpng version 1.4.0 */  |
1742 | PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr,  |
1743 | png_alloc_size_t size), PNG_ALLOCATED);  |
1744 |   |
1745 | /* Added at libpng version 1.2.4 */  |
1746 | PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr,  |
1747 | png_alloc_size_t size), PNG_ALLOCATED);  |
1748 |   |
1749 | /* Frees a pointer allocated by png_malloc() */  |
1750 | PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr));  |
1751 |   |
1752 | /* Free data that was allocated internally */  |
1753 | PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr,  |
1754 | png_inforp info_ptr, png_uint_32 free_me, int num));  |
1755 |   |
1756 | /* Reassign responsibility for freeing existing data, whether allocated  |
1757 | * by libpng or by the application; this works on the png_info structure passed  |
1758 | * in, it does not change the state for other png_info structures.  |
1759 | *  |
1760 | * It is unlikely that this function works correctly as of 1.6.0 and using it  |
1761 | * may result either in memory leaks or double free of allocated data.  |
1762 | */  |
1763 | PNG_EXPORT(99, void, png_data_freer, (png_const_structrp png_ptr,  |
1764 | png_inforp info_ptr, int freer, png_uint_32 mask));  |
1765 |   |
1766 | /* Assignments for png_data_freer */  |
1767 | #define PNG_DESTROY_WILL_FREE_DATA 1  |
1768 | #define PNG_SET_WILL_FREE_DATA 1  |
1769 | #define PNG_USER_WILL_FREE_DATA 2  |
1770 | /* Flags for png_ptr->free_me and info_ptr->free_me */  |
1771 | #define PNG_FREE_HIST 0x0008U  |
1772 | #define PNG_FREE_ICCP 0x0010U  |
1773 | #define PNG_FREE_SPLT 0x0020U  |
1774 | #define PNG_FREE_ROWS 0x0040U  |
1775 | #define PNG_FREE_PCAL 0x0080U  |
1776 | #define PNG_FREE_SCAL 0x0100U  |
1777 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED  |
1778 | # define PNG_FREE_UNKN 0x0200U  |
1779 | #endif  |
1780 | /* PNG_FREE_LIST 0x0400U removed in 1.6.0 because it is ignored */  |
1781 | #define PNG_FREE_PLTE 0x1000U  |
1782 | #define PNG_FREE_TRNS 0x2000U  |
1783 | #define PNG_FREE_TEXT 0x4000U  |
1784 | #define PNG_FREE_EXIF 0x8000U /* Added at libpng-1.6.31 */  |
1785 | #define PNG_FREE_ALL 0xffffU  |
1786 | #define PNG_FREE_MUL 0x4220U /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */  |
1787 |   |
1788 | #ifdef PNG_USER_MEM_SUPPORTED  |
1789 | PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr,  |
1790 | png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED);  |
1791 | PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr,  |
1792 | png_voidp ptr), PNG_DEPRECATED);  |
1793 | #endif  |
1794 |   |
1795 | #ifdef PNG_ERROR_TEXT_SUPPORTED  |
1796 | /* Fatal error in PNG image of libpng - can't continue */  |
1797 | PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr,  |
1798 | png_const_charp error_message), PNG_NORETURN);  |
1799 |   |
1800 | /* The same, but the chunk name is prepended to the error string. */  |
1801 | PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr,  |
1802 | png_const_charp error_message), PNG_NORETURN);  |
1803 |   |
1804 | #else  |
1805 | /* Fatal error in PNG image of libpng - can't continue */  |
1806 | PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN);  |
1807 | # define png_error(s1,s2) png_err(s1)  |
1808 | # define png_chunk_error(s1,s2) png_err(s1)  |
1809 | #endif  |
1810 |   |
1811 | #ifdef PNG_WARNINGS_SUPPORTED  |
1812 | /* Non-fatal error in libpng. Can continue, but may have a problem. */  |
1813 | PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr,  |
1814 | png_const_charp warning_message));  |
1815 |   |
1816 | /* Non-fatal error in libpng, chunk name is prepended to message. */  |
1817 | PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr,  |
1818 | png_const_charp warning_message));  |
1819 | #else  |
1820 | # define png_warning(s1,s2) ((void)(s1))  |
1821 | # define png_chunk_warning(s1,s2) ((void)(s1))  |
1822 | #endif  |
1823 |   |
1824 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED  |
1825 | /* Benign error in libpng. Can continue, but may have a problem.  |
1826 | * User can choose whether to handle as a fatal error or as a warning. */  |
1827 | PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr,  |
1828 | png_const_charp warning_message));  |
1829 |   |
1830 | #ifdef PNG_READ_SUPPORTED  |
1831 | /* Same, chunk name is prepended to message (only during read) */  |
1832 | PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr,  |
1833 | png_const_charp warning_message));  |
1834 | #endif  |
1835 |   |
1836 | PNG_EXPORT(109, void, png_set_benign_errors,  |
1837 | (png_structrp png_ptr, int allowed));  |
1838 | #else  |
1839 | # ifdef PNG_ALLOW_BENIGN_ERRORS  |
1840 | # define png_benign_error png_warning  |
1841 | # define png_chunk_benign_error png_chunk_warning  |
1842 | # else  |
1843 | # define png_benign_error png_error  |
1844 | # define png_chunk_benign_error png_chunk_error  |
1845 | # endif  |
1846 | #endif  |
1847 |   |
1848 | /* The png_set_<chunk> functions are for storing values in the png_info_struct.  |
1849 | * Similarly, the png_get_<chunk> calls are used to read values from the  |
1850 | * png_info_struct, either storing the parameters in the passed variables, or  |
1851 | * setting pointers into the png_info_struct where the data is stored. The  |
1852 | * png_get_<chunk> functions return a non-zero value if the data was available  |
1853 | * in info_ptr, or return zero and do not change any of the parameters if the  |
1854 | * data was not available.  |
1855 | *  |
1856 | * These functions should be used instead of directly accessing png_info  |
1857 | * to avoid problems with future changes in the size and internal layout of  |
1858 | * png_info_struct.  |
1859 | */  |
1860 | /* Returns "flag" if chunk data is valid in info_ptr. */  |
1861 | PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr,  |
1862 | png_const_inforp info_ptr, png_uint_32 flag));  |
1863 |   |
1864 | /* Returns number of bytes needed to hold a transformed row. */  |
1865 | PNG_EXPORT(111, size_t, png_get_rowbytes, (png_const_structrp png_ptr,  |
1866 | png_const_inforp info_ptr));  |
1867 |   |
1868 | #ifdef PNG_INFO_IMAGE_SUPPORTED  |
1869 | /* Returns row_pointers, which is an array of pointers to scanlines that was  |
1870 | * returned from png_read_png().  |
1871 | */  |
1872 | PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr,  |
1873 | png_const_inforp info_ptr));  |
1874 |   |
1875 | /* Set row_pointers, which is an array of pointers to scanlines for use  |
1876 | * by png_write_png().  |
1877 | */  |
1878 | PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr,  |
1879 | png_inforp info_ptr, png_bytepp row_pointers));  |
1880 | #endif  |
1881 |   |
1882 | /* Returns number of color channels in image. */  |
1883 | PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr,  |
1884 | png_const_inforp info_ptr));  |
1885 |   |
1886 | #ifdef PNG_EASY_ACCESS_SUPPORTED  |
1887 | /* Returns image width in pixels. */  |
1888 | PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr,  |
1889 | png_const_inforp info_ptr));  |
1890 |   |
1891 | /* Returns image height in pixels. */  |
1892 | PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr,  |
1893 | png_const_inforp info_ptr));  |
1894 |   |
1895 | /* Returns image bit_depth. */  |
1896 | PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr,  |
1897 | png_const_inforp info_ptr));  |
1898 |   |
1899 | /* Returns image color_type. */  |
1900 | PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr,  |
1901 | png_const_inforp info_ptr));  |
1902 |   |
1903 | /* Returns image filter_type. */  |
1904 | PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr,  |
1905 | png_const_inforp info_ptr));  |
1906 |   |
1907 | /* Returns image interlace_type. */  |
1908 | PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr,  |
1909 | png_const_inforp info_ptr));  |
1910 |   |
1911 | /* Returns image compression_type. */  |
1912 | PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr,  |
1913 | png_const_inforp info_ptr));  |
1914 |   |
1915 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */  |
1916 | PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,  |
1917 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1918 | PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,  |
1919 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1920 | PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,  |
1921 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1922 |   |
1923 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */  |
1924 | PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,  |
1925 | (png_const_structrp png_ptr, png_const_inforp info_ptr))  |
1926 | PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed,  |
1927 | (png_const_structrp png_ptr, png_const_inforp info_ptr))  |
1928 |   |
1929 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */  |
1930 | PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,  |
1931 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1932 | PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,  |
1933 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1934 | PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,  |
1935 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1936 | PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,  |
1937 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
1938 |   |
1939 | #endif /* EASY_ACCESS */  |
1940 |   |
1941 | #ifdef PNG_READ_SUPPORTED  |
1942 | /* Returns pointer to signature string read from PNG header */  |
1943 | PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr,  |
1944 | png_const_inforp info_ptr));  |
1945 | #endif  |
1946 |   |
1947 | #ifdef PNG_bKGD_SUPPORTED  |
1948 | PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr,  |
1949 | png_inforp info_ptr, png_color_16p *background));  |
1950 | #endif  |
1951 |   |
1952 | #ifdef PNG_bKGD_SUPPORTED  |
1953 | PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr,  |
1954 | png_inforp info_ptr, png_const_color_16p background));  |
1955 | #endif  |
1956 |   |
1957 | #ifdef PNG_cHRM_SUPPORTED  |
1958 | PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr,  |
1959 | png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x,  |
1960 | double *red_y, double *green_x, double *green_y, double *blue_x,  |
1961 | double *blue_y))  |
1962 | PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr,  |
1963 | png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z,  |
1964 | double *green_X, double *green_Y, double *green_Z, double *blue_X,  |
1965 | double *blue_Y, double *blue_Z))  |
1966 | PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,  |
1967 | (png_const_structrp png_ptr, png_const_inforp info_ptr,  |
1968 | png_fixed_point *int_white_x, png_fixed_point *int_white_y,  |
1969 | png_fixed_point *int_red_x, png_fixed_point *int_red_y,  |
1970 | png_fixed_point *int_green_x, png_fixed_point *int_green_y,  |
1971 | png_fixed_point *int_blue_x, png_fixed_point *int_blue_y))  |
1972 | PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed,  |
1973 | (png_const_structrp png_ptr, png_const_inforp info_ptr,  |
1974 | png_fixed_point *int_red_X, png_fixed_point *int_red_Y,  |
1975 | png_fixed_point *int_red_Z, png_fixed_point *int_green_X,  |
1976 | png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,  |
1977 | png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,  |
1978 | png_fixed_point *int_blue_Z))  |
1979 | #endif  |
1980 |   |
1981 | #ifdef PNG_cHRM_SUPPORTED  |
1982 | PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr,  |
1983 | png_inforp info_ptr,  |
1984 | double white_x, double white_y, double red_x, double red_y, double green_x,  |
1985 | double green_y, double blue_x, double blue_y))  |
1986 | PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr,  |
1987 | png_inforp info_ptr, double red_X, double red_Y, double red_Z,  |
1988 | double green_X, double green_Y, double green_Z, double blue_X,  |
1989 | double blue_Y, double blue_Z))  |
1990 | PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr,  |
1991 | png_inforp info_ptr, png_fixed_point int_white_x,  |
1992 | png_fixed_point int_white_y, png_fixed_point int_red_x,  |
1993 | png_fixed_point int_red_y, png_fixed_point int_green_x,  |
1994 | png_fixed_point int_green_y, png_fixed_point int_blue_x,  |
1995 | png_fixed_point int_blue_y))  |
1996 | PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr,  |
1997 | png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,  |
1998 | png_fixed_point int_red_Z, png_fixed_point int_green_X,  |
1999 | png_fixed_point int_green_Y, png_fixed_point int_green_Z,  |
2000 | png_fixed_point int_blue_X, png_fixed_point int_blue_Y,  |
2001 | png_fixed_point int_blue_Z))  |
2002 | #endif  |
2003 |   |
2004 | #ifdef PNG_eXIf_SUPPORTED  |
2005 | PNG_EXPORT(246, png_uint_32, png_get_eXIf, (png_const_structrp png_ptr,  |
2006 | png_inforp info_ptr, png_bytep *exif));  |
2007 | PNG_EXPORT(247, void, png_set_eXIf, (png_const_structrp png_ptr,  |
2008 | png_inforp info_ptr, png_bytep exif));  |
2009 |   |
2010 | PNG_EXPORT(248, png_uint_32, png_get_eXIf_1, (png_const_structrp png_ptr,  |
2011 | png_const_inforp info_ptr, png_uint_32 *num_exif, png_bytep *exif));  |
2012 | PNG_EXPORT(249, void, png_set_eXIf_1, (png_const_structrp png_ptr,  |
2013 | png_inforp info_ptr, png_uint_32 num_exif, png_bytep exif));  |
2014 | #endif  |
2015 |   |
2016 | #ifdef PNG_gAMA_SUPPORTED  |
2017 | PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr,  |
2018 | png_const_inforp info_ptr, double *file_gamma))  |
2019 | PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed,  |
2020 | (png_const_structrp png_ptr, png_const_inforp info_ptr,  |
2021 | png_fixed_point *int_file_gamma))  |
2022 | #endif  |
2023 |   |
2024 | #ifdef PNG_gAMA_SUPPORTED  |
2025 | PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr,  |
2026 | png_inforp info_ptr, double file_gamma))  |
2027 | PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr,  |
2028 | png_inforp info_ptr, png_fixed_point int_file_gamma))  |
2029 | #endif  |
2030 |   |
2031 | #ifdef PNG_hIST_SUPPORTED  |
2032 | PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr,  |
2033 | png_inforp info_ptr, png_uint_16p *hist));  |
2034 | PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr,  |
2035 | png_inforp info_ptr, png_const_uint_16p hist));  |
2036 | #endif  |
2037 |   |
2038 | PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr,  |
2039 | png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height,  |
2040 | int *bit_depth, int *color_type, int *interlace_method,  |
2041 | int *compression_method, int *filter_method));  |
2042 |   |
2043 | PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr,  |
2044 | png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,  |
2045 | int color_type, int interlace_method, int compression_method,  |
2046 | int filter_method));  |
2047 |   |
2048 | #ifdef PNG_oFFs_SUPPORTED  |
2049 | PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr,  |
2050 | png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,  |
2051 | int *unit_type));  |
2052 | #endif  |
2053 |   |
2054 | #ifdef PNG_oFFs_SUPPORTED  |
2055 | PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr,  |
2056 | png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y,  |
2057 | int unit_type));  |
2058 | #endif  |
2059 |   |
2060 | #ifdef PNG_pCAL_SUPPORTED  |
2061 | PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr,  |
2062 | png_inforp info_ptr, png_charp *purpose, png_int_32 *X0,  |
2063 | png_int_32 *X1, int *type, int *nparams, png_charp *units,  |
2064 | png_charpp *params));  |
2065 | #endif  |
2066 |   |
2067 | #ifdef PNG_pCAL_SUPPORTED  |
2068 | PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr,  |
2069 | png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1,  |
2070 | int type, int nparams, png_const_charp units, png_charpp params));  |
2071 | #endif  |
2072 |   |
2073 | #ifdef PNG_pHYs_SUPPORTED  |
2074 | PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr,  |
2075 | png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,  |
2076 | int *unit_type));  |
2077 | #endif  |
2078 |   |
2079 | #ifdef PNG_pHYs_SUPPORTED  |
2080 | PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr,  |
2081 | png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));  |
2082 | #endif  |
2083 |   |
2084 | PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr,  |
2085 | png_inforp info_ptr, png_colorp *palette, int *num_palette));  |
2086 |   |
2087 | PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr,  |
2088 | png_inforp info_ptr, png_const_colorp palette, int num_palette));  |
2089 |   |
2090 | #ifdef PNG_sBIT_SUPPORTED  |
2091 | PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr,  |
2092 | png_inforp info_ptr, png_color_8p *sig_bit));  |
2093 | #endif  |
2094 |   |
2095 | #ifdef PNG_sBIT_SUPPORTED  |
2096 | PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr,  |
2097 | png_inforp info_ptr, png_const_color_8p sig_bit));  |
2098 | #endif  |
2099 |   |
2100 | #ifdef PNG_sRGB_SUPPORTED  |
2101 | PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr,  |
2102 | png_const_inforp info_ptr, int *file_srgb_intent));  |
2103 | #endif  |
2104 |   |
2105 | #ifdef PNG_sRGB_SUPPORTED  |
2106 | PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr,  |
2107 | png_inforp info_ptr, int srgb_intent));  |
2108 | PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr,  |
2109 | png_inforp info_ptr, int srgb_intent));  |
2110 | #endif  |
2111 |   |
2112 | #ifdef PNG_iCCP_SUPPORTED  |
2113 | PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr,  |
2114 | png_inforp info_ptr, png_charpp name, int *compression_type,  |
2115 | png_bytepp profile, png_uint_32 *proflen));  |
2116 | #endif  |
2117 |   |
2118 | #ifdef PNG_iCCP_SUPPORTED  |
2119 | PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr,  |
2120 | png_inforp info_ptr, png_const_charp name, int compression_type,  |
2121 | png_const_bytep profile, png_uint_32 proflen));  |
2122 | #endif  |
2123 |   |
2124 | #ifdef PNG_sPLT_SUPPORTED  |
2125 | PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr,  |
2126 | png_inforp info_ptr, png_sPLT_tpp entries));  |
2127 | #endif  |
2128 |   |
2129 | #ifdef PNG_sPLT_SUPPORTED  |
2130 | PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr,  |
2131 | png_inforp info_ptr, png_const_sPLT_tp entries, int nentries));  |
2132 | #endif  |
2133 |   |
2134 | #ifdef PNG_TEXT_SUPPORTED  |
2135 | /* png_get_text also returns the number of text chunks in *num_text */  |
2136 | PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr,  |
2137 | png_inforp info_ptr, png_textp *text_ptr, int *num_text));  |
2138 | #endif  |
2139 |   |
2140 | /* Note while png_set_text() will accept a structure whose text,  |
2141 | * language, and translated keywords are NULL pointers, the structure  |
2142 | * returned by png_get_text will always contain regular  |
2143 | * zero-terminated C strings. They might be empty strings but  |
2144 | * they will never be NULL pointers.  |
2145 | */  |
2146 |   |
2147 | #ifdef PNG_TEXT_SUPPORTED  |
2148 | PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr,  |
2149 | png_inforp info_ptr, png_const_textp text_ptr, int num_text));  |
2150 | #endif  |
2151 |   |
2152 | #ifdef PNG_tIME_SUPPORTED  |
2153 | PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr,  |
2154 | png_inforp info_ptr, png_timep *mod_time));  |
2155 | #endif  |
2156 |   |
2157 | #ifdef PNG_tIME_SUPPORTED  |
2158 | PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr,  |
2159 | png_inforp info_ptr, png_const_timep mod_time));  |
2160 | #endif  |
2161 |   |
2162 | #ifdef PNG_tRNS_SUPPORTED  |
2163 | PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr,  |
2164 | png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans,  |
2165 | png_color_16p *trans_color));  |
2166 | #endif  |
2167 |   |
2168 | #ifdef PNG_tRNS_SUPPORTED  |
2169 | PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr,  |
2170 | png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans,  |
2171 | png_const_color_16p trans_color));  |
2172 | #endif  |
2173 |   |
2174 | #ifdef PNG_sCAL_SUPPORTED  |
2175 | PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr,  |
2176 | png_const_inforp info_ptr, int *unit, double *width, double *height))  |
2177 | #if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \  |
2178 | defined(PNG_FLOATING_POINT_SUPPORTED)  |
2179 | /* NOTE: this API is currently implemented using floating point arithmetic,  |
2180 | * consequently it can only be used on systems with floating point support.  |
2181 | * In any case the range of values supported by png_fixed_point is small and it  |
2182 | * is highly recommended that png_get_sCAL_s be used instead.  |
2183 | */  |
2184 | PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,  |
2185 | (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,  |
2186 | png_fixed_point *width, png_fixed_point *height))  |
2187 | #endif  |
2188 | PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,  |
2189 | (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit,  |
2190 | png_charpp swidth, png_charpp sheight));  |
2191 |   |
2192 | PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr,  |
2193 | png_inforp info_ptr, int unit, double width, double height))  |
2194 | PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr,  |
2195 | png_inforp info_ptr, int unit, png_fixed_point width,  |
2196 | png_fixed_point height))  |
2197 | PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr,  |
2198 | png_inforp info_ptr, int unit,  |
2199 | png_const_charp swidth, png_const_charp sheight));  |
2200 | #endif /* sCAL */  |
2201 |   |
2202 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED  |
2203 | /* Provide the default handling for all unknown chunks or, optionally, for  |
2204 | * specific unknown chunks.  |
2205 | *  |
2206 | * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was  |
2207 | * ignored and the default was used, the per-chunk setting only had an effect on  |
2208 | * write. If you wish to have chunk-specific handling on read in code that must  |
2209 | * work on earlier versions you must use a user chunk callback to specify the  |
2210 | * desired handling (keep or discard.)  |
2211 | *  |
2212 | * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The  |
2213 | * parameter is interpreted as follows:  |
2214 | *  |
2215 | * READ:  |
2216 | * PNG_HANDLE_CHUNK_AS_DEFAULT:  |
2217 | * Known chunks: do normal libpng processing, do not keep the chunk (but  |
2218 | * see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED)  |
2219 | * Unknown chunks: for a specific chunk use the global default, when used  |
2220 | * as the default discard the chunk data.  |
2221 | * PNG_HANDLE_CHUNK_NEVER:  |
2222 | * Discard the chunk data.  |
2223 | * PNG_HANDLE_CHUNK_IF_SAFE:  |
2224 | * Keep the chunk data if the chunk is not critical else raise a chunk  |
2225 | * error.  |
2226 | * PNG_HANDLE_CHUNK_ALWAYS:  |
2227 | * Keep the chunk data.  |
2228 | *  |
2229 | * If the chunk data is saved it can be retrieved using png_get_unknown_chunks,  |
2230 | * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent  |
2231 | * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks  |
2232 | * it simply resets the behavior to the libpng default.  |
2233 | *  |
2234 | * INTERACTION WITH USER CHUNK CALLBACKS:  |
2235 | * The per-chunk handling is always used when there is a png_user_chunk_ptr  |
2236 | * callback and the callback returns 0; the chunk is then always stored *unless*  |
2237 | * it is critical and the per-chunk setting is other than ALWAYS. Notice that  |
2238 | * the global default is *not* used in this case. (In effect the per-chunk  |
2239 | * value is incremented to at least IF_SAFE.)  |
2240 | *  |
2241 | * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and  |
2242 | * per-chunk defaults will be honored. If you want to preserve the current  |
2243 | * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE  |
2244 | * as the default - if you don't do this libpng 1.6 will issue a warning.  |
2245 | *  |
2246 | * If you want unhandled unknown chunks to be discarded in libpng 1.6 and  |
2247 | * earlier simply return '1' (handled).  |
2248 | *  |
2249 | * PNG_HANDLE_AS_UNKNOWN_SUPPORTED:  |
2250 | * If this is *not* set known chunks will always be handled by libpng and  |
2251 | * will never be stored in the unknown chunk list. Known chunks listed to  |
2252 | * png_set_keep_unknown_chunks will have no effect. If it is set then known  |
2253 | * chunks listed with a keep other than AS_DEFAULT will *never* be processed  |
2254 | * by libpng, in addition critical chunks must either be processed by the  |
2255 | * callback or saved.  |
2256 | *  |
2257 | * The IHDR and IEND chunks must not be listed. Because this turns off the  |
2258 | * default handling for chunks that would otherwise be recognized the  |
2259 | * behavior of libpng transformations may well become incorrect!  |
2260 | *  |
2261 | * WRITE:  |
2262 | * When writing chunks the options only apply to the chunks specified by  |
2263 | * png_set_unknown_chunks (below), libpng will *always* write known chunks  |
2264 | * required by png_set_ calls and will always write the core critical chunks  |
2265 | * (as required for PLTE).  |
2266 | *  |
2267 | * Each chunk in the png_set_unknown_chunks list is looked up in the  |
2268 | * png_set_keep_unknown_chunks list to find the keep setting, this is then  |
2269 | * interpreted as follows:  |
2270 | *  |
2271 | * PNG_HANDLE_CHUNK_AS_DEFAULT:  |
2272 | * Write safe-to-copy chunks and write other chunks if the global  |
2273 | * default is set to _ALWAYS, otherwise don't write this chunk.  |
2274 | * PNG_HANDLE_CHUNK_NEVER:  |
2275 | * Do not write the chunk.  |
2276 | * PNG_HANDLE_CHUNK_IF_SAFE:  |
2277 | * Write the chunk if it is safe-to-copy, otherwise do not write it.  |
2278 | * PNG_HANDLE_CHUNK_ALWAYS:  |
2279 | * Write the chunk.  |
2280 | *  |
2281 | * Note that the default behavior is effectively the opposite of the read case -  |
2282 | * in read unknown chunks are not stored by default, in write they are written  |
2283 | * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different  |
2284 | * - on write the safe-to-copy bit is checked, on read the critical bit is  |
2285 | * checked and on read if the chunk is critical an error will be raised.  |
2286 | *  |
2287 | * num_chunks:  |
2288 | * ===========  |
2289 | * If num_chunks is positive, then the "keep" parameter specifies the manner  |
2290 | * for handling only those chunks appearing in the chunk_list array,  |
2291 | * otherwise the chunk list array is ignored.  |
2292 | *  |
2293 | * If num_chunks is 0 the "keep" parameter specifies the default behavior for  |
2294 | * unknown chunks, as described above.  |
2295 | *  |
2296 | * If num_chunks is negative, then the "keep" parameter specifies the manner  |
2297 | * for handling all unknown chunks plus all chunks recognized by libpng  |
2298 | * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to  |
2299 | * be processed by libpng.  |
2300 | */  |
2301 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED  |
2302 | PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr,  |
2303 | int keep, png_const_bytep chunk_list, int num_chunks));  |
2304 | #endif /* HANDLE_AS_UNKNOWN */  |
2305 |   |
2306 | /* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned;  |
2307 | * the result is therefore true (non-zero) if special handling is required,  |
2308 | * false for the default handling.  |
2309 | */  |
2310 | PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr,  |
2311 | png_const_bytep chunk_name));  |
2312 | #endif /* SET_UNKNOWN_CHUNKS */  |
2313 |   |
2314 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED  |
2315 | PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr,  |
2316 | png_inforp info_ptr, png_const_unknown_chunkp unknowns,  |
2317 | int num_unknowns));  |
2318 | /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added  |
2319 | * unknowns to the location currently stored in the png_struct. This is  |
2320 | * invariably the wrong value on write. To fix this call the following API  |
2321 | * for each chunk in the list with the correct location. If you know your  |
2322 | * code won't be compiled on earlier versions you can rely on  |
2323 | * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing  |
2324 | * the correct thing.  |
2325 | */  |
2326 |   |
2327 | PNG_EXPORT(175, void, png_set_unknown_chunk_location,  |
2328 | (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location));  |
2329 |   |
2330 | PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr,  |
2331 | png_inforp info_ptr, png_unknown_chunkpp entries));  |
2332 | #endif  |
2333 |   |
2334 | /* Png_free_data() will turn off the "valid" flag for anything it frees.  |
2335 | * If you need to turn it off for a chunk that your application has freed,  |
2336 | * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);  |
2337 | */  |
2338 | PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr,  |
2339 | png_inforp info_ptr, int mask));  |
2340 |   |
2341 | #ifdef PNG_INFO_IMAGE_SUPPORTED  |
2342 | /* The "params" pointer is currently not used and is for future expansion. */  |
2343 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED  |
2344 | PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr,  |
2345 | int transforms, png_voidp params));  |
2346 | #endif  |
2347 | #ifdef PNG_WRITE_SUPPORTED  |
2348 | PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr,  |
2349 | int transforms, png_voidp params));  |
2350 | #endif  |
2351 | #endif  |
2352 |   |
2353 | PNG_EXPORT(180, png_const_charp, png_get_copyright,  |
2354 | (png_const_structrp png_ptr));  |
2355 | PNG_EXPORT(181, png_const_charp, ,  |
2356 | (png_const_structrp png_ptr));  |
2357 | PNG_EXPORT(182, png_const_charp, ,  |
2358 | (png_const_structrp png_ptr));  |
2359 | PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,  |
2360 | (png_const_structrp png_ptr));  |
2361 |   |
2362 | #ifdef PNG_MNG_FEATURES_SUPPORTED  |
2363 | PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr,  |
2364 | png_uint_32 mng_features_permitted));  |
2365 | #endif  |
2366 |   |
2367 | /* For use in png_set_keep_unknown, added to version 1.2.6 */  |
2368 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0  |
2369 | #define PNG_HANDLE_CHUNK_NEVER 1  |
2370 | #define PNG_HANDLE_CHUNK_IF_SAFE 2  |
2371 | #define PNG_HANDLE_CHUNK_ALWAYS 3  |
2372 | #define PNG_HANDLE_CHUNK_LAST 4  |
2373 |   |
2374 | /* Strip the prepended error numbers ("#nnn ") from error and warning  |
2375 | * messages before passing them to the error or warning handler.  |
2376 | */  |
2377 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED  |
2378 | PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr,  |
2379 | png_uint_32 strip_mode));  |
2380 | #endif  |
2381 |   |
2382 | /* Added in libpng-1.2.6 */  |
2383 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED  |
2384 | PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr,  |
2385 | png_uint_32 user_width_max, png_uint_32 user_height_max));  |
2386 | PNG_EXPORT(187, png_uint_32, png_get_user_width_max,  |
2387 | (png_const_structrp png_ptr));  |
2388 | PNG_EXPORT(188, png_uint_32, png_get_user_height_max,  |
2389 | (png_const_structrp png_ptr));  |
2390 | /* Added in libpng-1.4.0 */  |
2391 | PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr,  |
2392 | png_uint_32 user_chunk_cache_max));  |
2393 | PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,  |
2394 | (png_const_structrp png_ptr));  |
2395 | /* Added in libpng-1.4.1 */  |
2396 | PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr,  |
2397 | png_alloc_size_t user_chunk_cache_max));  |
2398 | PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,  |
2399 | (png_const_structrp png_ptr));  |
2400 | #endif  |
2401 |   |
2402 | #if defined(PNG_INCH_CONVERSIONS_SUPPORTED)  |
2403 | PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,  |
2404 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
2405 |   |
2406 | PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,  |
2407 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
2408 |   |
2409 | PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,  |
2410 | (png_const_structrp png_ptr, png_const_inforp info_ptr));  |
2411 |   |
2412 | PNG_FP_EXPORT(196, float, png_get_x_offset_inches,  |
2413 | (png_const_structrp png_ptr, png_const_inforp info_ptr))  |
2414 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */  |
2415 | PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed,  |
2416 | (png_const_structrp png_ptr, png_const_inforp info_ptr))  |
2417 | #endif  |
2418 |   |
2419 | PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr,  |
2420 | png_const_inforp info_ptr))  |
2421 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */  |
2422 | PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed,  |
2423 | (png_const_structrp png_ptr, png_const_inforp info_ptr))  |
2424 | #endif  |
2425 |   |
2426 | # ifdef PNG_pHYs_SUPPORTED  |
2427 | PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr,  |
2428 | png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,  |
2429 | int *unit_type));  |
2430 | # endif /* pHYs */  |
2431 | #endif /* INCH_CONVERSIONS */  |
2432 |   |
2433 | /* Added in libpng-1.4.0 */  |
2434 | #ifdef PNG_IO_STATE_SUPPORTED  |
2435 | PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr));  |
2436 |   |
2437 | /* Removed from libpng 1.6; use png_get_io_chunk_type. */  |
2438 | PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr),  |
2439 | PNG_DEPRECATED)  |
2440 |   |
2441 | PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,  |
2442 | (png_const_structrp png_ptr));  |
2443 |   |
2444 | /* The flags returned by png_get_io_state() are the following: */  |
2445 | # define PNG_IO_NONE 0x0000 /* no I/O at this moment */  |
2446 | # define PNG_IO_READING 0x0001 /* currently reading */  |
2447 | # define PNG_IO_WRITING 0x0002 /* currently writing */  |
2448 | # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */  |
2449 | # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */  |
2450 | # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */  |
2451 | # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */  |
2452 | # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */  |
2453 | # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */  |
2454 | #endif /* IO_STATE */  |
2455 |   |
2456 | /* Interlace support. The following macros are always defined so that if  |
2457 | * libpng interlace handling is turned off the macros may be used to handle  |
2458 | * interlaced images within the application.  |
2459 | */  |
2460 | #define PNG_INTERLACE_ADAM7_PASSES 7  |
2461 |   |
2462 | /* Two macros to return the first row and first column of the original,  |
2463 | * full, image which appears in a given pass. 'pass' is in the range 0  |
2464 | * to 6 and the result is in the range 0 to 7.  |
2465 | */  |
2466 | #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)  |
2467 | #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)  |
2468 |   |
2469 | /* A macro to return the offset between pixels in the output row for a pair of  |
2470 | * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that  |
2471 | * follows. Note that ROW_OFFSET is the offset from one row to the next whereas  |
2472 | * COL_OFFSET is from one column to the next, within a row.  |
2473 | */  |
2474 | #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)  |
2475 | #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))  |
2476 |   |
2477 | /* Two macros to help evaluate the number of rows or columns in each  |
2478 | * pass. This is expressed as a shift - effectively log2 of the number or  |
2479 | * rows or columns in each 8x8 tile of the original image.  |
2480 | */  |
2481 | #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)  |
2482 | #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)  |
2483 |   |
2484 | /* Hence two macros to determine the number of rows or columns in a given  |
2485 | * pass of an image given its height or width. In fact these macros may  |
2486 | * return non-zero even though the sub-image is empty, because the other  |
2487 | * dimension may be empty for a small image.  |
2488 | */  |
2489 | #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\  |
2490 | -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))  |
2491 | #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\  |
2492 | -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))  |
2493 |   |
2494 | /* For the reader row callbacks (both progressive and sequential) it is  |
2495 | * necessary to find the row in the output image given a row in an interlaced  |
2496 | * image, so two more macros:  |
2497 | */  |
2498 | #define PNG_ROW_FROM_PASS_ROW(y_in, pass) \  |
2499 | (((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))  |
2500 | #define PNG_COL_FROM_PASS_COL(x_in, pass) \  |
2501 | (((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))  |
2502 |   |
2503 | /* Two macros which return a boolean (0 or 1) saying whether the given row  |
2504 | * or column is in a particular pass. These use a common utility macro that  |
2505 | * returns a mask for a given pass - the offset 'off' selects the row or  |
2506 | * column version. The mask has the appropriate bit set for each column in  |
2507 | * the tile.  |
2508 | */  |
2509 | #define PNG_PASS_MASK(pass,off) ( \  |
2510 | ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \  |
2511 | ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))  |
2512 |   |
2513 | #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \  |
2514 | ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)  |
2515 | #define PNG_COL_IN_INTERLACE_PASS(x, pass) \  |
2516 | ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)  |
2517 |   |
2518 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED  |
2519 | /* With these routines we avoid an integer divide, which will be slower on  |
2520 | * most machines. However, it does take more operations than the corresponding  |
2521 | * divide method, so it may be slower on a few RISC systems. There are two  |
2522 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.  |
2523 | *  |
2524 | * Note that the rounding factors are NOT supposed to be the same! 128 and  |
2525 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the  |
2526 | * standard method.  |
2527 | *  |
2528 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]  |
2529 | */  |
2530 |   |
2531 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */  |
2532 |   |
2533 | # define png_composite(composite, fg, alpha, bg) \  |
2534 | { \  |
2535 | png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \  |
2536 | * (png_uint_16)(alpha) \  |
2537 | + (png_uint_16)(bg)*(png_uint_16)(255 \  |
2538 | - (png_uint_16)(alpha)) + 128); \  |
2539 | (composite) = (png_byte)(((temp + (temp >> 8)) >> 8) & 0xff); \  |
2540 | }  |
2541 |   |
2542 | # define png_composite_16(composite, fg, alpha, bg) \  |
2543 | { \  |
2544 | png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \  |
2545 | * (png_uint_32)(alpha) \  |
2546 | + (png_uint_32)(bg)*(65535 \  |
2547 | - (png_uint_32)(alpha)) + 32768); \  |
2548 | (composite) = (png_uint_16)(0xffff & ((temp + (temp >> 16)) >> 16)); \  |
2549 | }  |
2550 |   |
2551 | #else /* Standard method using integer division */  |
2552 |   |
2553 | # define png_composite(composite, fg, alpha, bg) \  |
2554 | (composite) = \  |
2555 | (png_byte)(0xff & (((png_uint_16)(fg) * (png_uint_16)(alpha) + \  |
2556 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \  |
2557 | 127) / 255))  |
2558 |   |
2559 | # define png_composite_16(composite, fg, alpha, bg) \  |
2560 | (composite) = \  |
2561 | (png_uint_16)(0xffff & (((png_uint_32)(fg) * (png_uint_32)(alpha) + \  |
2562 | (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \  |
2563 | 32767) / 65535))  |
2564 | #endif /* READ_COMPOSITE_NODIV */  |
2565 |   |
2566 | #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED  |
2567 | PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));  |
2568 | PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));  |
2569 | PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf));  |
2570 | #endif  |
2571 |   |
2572 | PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr,  |
2573 | png_const_bytep buf));  |
2574 | /* No png_get_int_16 -- may be added if there's a real need for it. */  |
2575 |   |
2576 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */  |
2577 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED  |
2578 | PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));  |
2579 | #endif  |
2580 | #ifdef PNG_SAVE_INT_32_SUPPORTED  |
2581 | PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));  |
2582 | #endif  |
2583 |   |
2584 | /* Place a 16-bit number into a buffer in PNG byte order.  |
2585 | * The parameter is declared unsigned int, not png_uint_16,  |
2586 | * just to avoid potential problems on pre-ANSI C compilers.  |
2587 | */  |
2588 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED  |
2589 | PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));  |
2590 | /* No png_save_int_16 -- may be added if there's a real need for it. */  |
2591 | #endif  |
2592 |   |
2593 | #ifdef PNG_USE_READ_MACROS  |
2594 | /* Inline macros to do direct reads of bytes from the input buffer.  |
2595 | * The png_get_int_32() routine assumes we are using two's complement  |
2596 | * format for negative values, which is almost certainly true.  |
2597 | */  |
2598 | # define PNG_get_uint_32(buf) \  |
2599 | (((png_uint_32)(*(buf)) << 24) + \  |
2600 | ((png_uint_32)(*((buf) + 1)) << 16) + \  |
2601 | ((png_uint_32)(*((buf) + 2)) << 8) + \  |
2602 | ((png_uint_32)(*((buf) + 3))))  |
2603 |   |
2604 | /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the  |
2605 | * function) incorrectly returned a value of type png_uint_32.  |
2606 | */  |
2607 | # define PNG_get_uint_16(buf) \  |
2608 | ((png_uint_16) \  |
2609 | (((unsigned int)(*(buf)) << 8) + \  |
2610 | ((unsigned int)(*((buf) + 1)))))  |
2611 |   |
2612 | # define PNG_get_int_32(buf) \  |
2613 | ((png_int_32)((*(buf) & 0x80) \  |
2614 | ? -((png_int_32)(((png_get_uint_32(buf)^0xffffffffU)+1U)&0x7fffffffU)) \  |
2615 | : (png_int_32)png_get_uint_32(buf)))  |
2616 |   |
2617 | /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h,  |
2618 | * but defining a macro name prefixed with PNG_PREFIX.  |
2619 | */  |
2620 | # ifndef PNG_PREFIX  |
2621 | # define png_get_uint_32(buf) PNG_get_uint_32(buf)  |
2622 | # define png_get_uint_16(buf) PNG_get_uint_16(buf)  |
2623 | # define png_get_int_32(buf) PNG_get_int_32(buf)  |
2624 | # endif  |
2625 | #else  |
2626 | # ifdef PNG_PREFIX  |
2627 | /* No macros; revert to the (redefined) function */  |
2628 | # define PNG_get_uint_32 (png_get_uint_32)  |
2629 | # define PNG_get_uint_16 (png_get_uint_16)  |
2630 | # define PNG_get_int_32 (png_get_int_32)  |
2631 | # endif  |
2632 | #endif  |
2633 |   |
2634 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED  |
2635 | PNG_EXPORT(242, void, png_set_check_for_invalid_index,  |
2636 | (png_structrp png_ptr, int allowed));  |
2637 | # ifdef PNG_GET_PALETTE_MAX_SUPPORTED  |
2638 | PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr,  |
2639 | png_const_infop info_ptr));  |
2640 | # endif  |
2641 | #endif /* CHECK_FOR_INVALID_INDEX */  |
2642 |   |
2643 | /*******************************************************************************  |
2644 | * Section 5: SIMPLIFIED API  |
2645 | *******************************************************************************  |
2646 | *  |
2647 | * Please read the documentation in libpng-manual.txt (TODO: write said  |
2648 | * documentation) if you don't understand what follows.  |
2649 | *  |
2650 | * The simplified API hides the details of both libpng and the PNG file format  |
2651 | * itself. It allows PNG files to be read into a very limited number of  |
2652 | * in-memory bitmap formats or to be written from the same formats. If these  |
2653 | * formats do not accommodate your needs then you can, and should, use the more  |
2654 | * sophisticated APIs above - these support a wide variety of in-memory formats  |
2655 | * and a wide variety of sophisticated transformations to those formats as well  |
2656 | * as a wide variety of APIs to manipulate ancillary information.  |
2657 | *  |
2658 | * To read a PNG file using the simplified API:  |
2659 | *  |
2660 | * 1) Declare a 'png_image' structure (see below) on the stack, set the  |
2661 | * version field to PNG_IMAGE_VERSION and the 'opaque' pointer to NULL  |
2662 | * (this is REQUIRED, your program may crash if you don't do it.)  |
2663 | * 2) Call the appropriate png_image_begin_read... function.  |
2664 | * 3) Set the png_image 'format' member to the required sample format.  |
2665 | * 4) Allocate a buffer for the image and, if required, the color-map.  |
2666 | * 5) Call png_image_finish_read to read the image and, if required, the  |
2667 | * color-map into your buffers.  |
2668 | *  |
2669 | * There are no restrictions on the format of the PNG input itself; all valid  |
2670 | * color types, bit depths, and interlace methods are acceptable, and the  |
2671 | * input image is transformed as necessary to the requested in-memory format  |
2672 | * during the png_image_finish_read() step. The only caveat is that if you  |
2673 | * request a color-mapped image from a PNG that is full-color or makes  |
2674 | * complex use of an alpha channel the transformation is extremely lossy and the  |
2675 | * result may look terrible.  |
2676 | *  |
2677 | * To write a PNG file using the simplified API:  |
2678 | *  |
2679 | * 1) Declare a 'png_image' structure on the stack and memset() it to all zero.  |
2680 | * 2) Initialize the members of the structure that describe the image, setting  |
2681 | * the 'format' member to the format of the image samples.  |
2682 | * 3) Call the appropriate png_image_write... function with a pointer to the  |
2683 | * image and, if necessary, the color-map to write the PNG data.  |
2684 | *  |
2685 | * png_image is a structure that describes the in-memory format of an image  |
2686 | * when it is being read or defines the in-memory format of an image that you  |
2687 | * need to write:  |
2688 | */  |
2689 | #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \  |
2690 | defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)  |
2691 |   |
2692 | #define PNG_IMAGE_VERSION 1  |
2693 |   |
2694 | typedef struct png_control *png_controlp;  |
2695 | typedef struct  |
2696 | {  |
2697 | png_controlp opaque; /* Initialize to NULL, free with png_image_free */  |
2698 | png_uint_32 version; /* Set to PNG_IMAGE_VERSION */  |
2699 | png_uint_32 width; /* Image width in pixels (columns) */  |
2700 | png_uint_32 height; /* Image height in pixels (rows) */  |
2701 | png_uint_32 format; /* Image format as defined below */  |
2702 | png_uint_32 flags; /* A bit mask containing informational flags */  |
2703 | png_uint_32 colormap_entries;  |
2704 | /* Number of entries in the color-map */  |
2705 |   |
2706 | /* In the event of an error or warning the following field will be set to a  |
2707 | * non-zero value and the 'message' field will contain a '\0' terminated  |
2708 | * string with the libpng error or warning message. If both warnings and  |
2709 | * an error were encountered, only the error is recorded. If there  |
2710 | * are multiple warnings, only the first one is recorded.  |
2711 | *  |
2712 | * The upper 30 bits of this value are reserved, the low two bits contain  |
2713 | * a value as follows:  |
2714 | */  |
2715 | # define PNG_IMAGE_WARNING 1  |
2716 | # define PNG_IMAGE_ERROR 2  |
2717 | /*  |
2718 | * The result is a two-bit code such that a value more than 1 indicates  |
2719 | * a failure in the API just called:  |
2720 | *  |
2721 | * 0 - no warning or error  |
2722 | * 1 - warning  |
2723 | * 2 - error  |
2724 | * 3 - error preceded by warning  |
2725 | */  |
2726 | # define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1)  |
2727 |   |
2728 | png_uint_32 warning_or_error;  |
2729 |   |
2730 | char message[64];  |
2731 | } png_image, *png_imagep;  |
2732 |   |
2733 | /* The samples of the image have one to four channels whose components have  |
2734 | * original values in the range 0 to 1.0:  |
2735 | *  |
2736 | * 1: A single gray or luminance channel (G).  |
2737 | * 2: A gray/luminance channel and an alpha channel (GA).  |
2738 | * 3: Three red, green, blue color channels (RGB).  |
2739 | * 4: Three color channels and an alpha channel (RGBA).  |
2740 | *  |
2741 | * The components are encoded in one of two ways:  |
2742 | *  |
2743 | * a) As a small integer, value 0..255, contained in a single byte. For the  |
2744 | * alpha channel the original value is simply value/255. For the color or  |
2745 | * luminance channels the value is encoded according to the sRGB specification  |
2746 | * and matches the 8-bit format expected by typical display devices.  |
2747 | *  |
2748 | * The color/gray channels are not scaled (pre-multiplied) by the alpha  |
2749 | * channel and are suitable for passing to color management software.  |
2750 | *  |
2751 | * b) As a value in the range 0..65535, contained in a 2-byte integer. All  |
2752 | * channels can be converted to the original value by dividing by 65535; all  |
2753 | * channels are linear. Color channels use the RGB encoding (RGB end-points) of  |
2754 | * the sRGB specification. This encoding is identified by the  |
2755 | * PNG_FORMAT_FLAG_LINEAR flag below.  |
2756 | *  |
2757 | * When the simplified API needs to convert between sRGB and linear colorspaces,  |
2758 | * the actual sRGB transfer curve defined in the sRGB specification (see the  |
2759 | * article at <https://en.wikipedia.org/wiki/SRGB>) is used, not the gamma=1/2.2  |
2760 | * approximation used elsewhere in libpng.  |
2761 | *  |
2762 | * When an alpha channel is present it is expected to denote pixel coverage  |
2763 | * of the color or luminance channels and is returned as an associated alpha  |
2764 | * channel: the color/gray channels are scaled (pre-multiplied) by the alpha  |
2765 | * value.  |
2766 | *  |
2767 | * The samples are either contained directly in the image data, between 1 and 8  |
2768 | * bytes per pixel according to the encoding, or are held in a color-map indexed  |
2769 | * by bytes in the image data. In the case of a color-map the color-map entries  |
2770 | * are individual samples, encoded as above, and the image data has one byte per  |
2771 | * pixel to select the relevant sample from the color-map.  |
2772 | */  |
2773 |   |
2774 | /* PNG_FORMAT_*  |
2775 | *  |
2776 | * #defines to be used in png_image::format. Each #define identifies a  |
2777 | * particular layout of sample data and, if present, alpha values. There are  |
2778 | * separate defines for each of the two component encodings.  |
2779 | *  |
2780 | * A format is built up using single bit flag values. All combinations are  |
2781 | * valid. Formats can be built up from the flag values or you can use one of  |
2782 | * the predefined values below. When testing formats always use the FORMAT_FLAG  |
2783 | * macros to test for individual features - future versions of the library may  |
2784 | * add new flags.  |
2785 | *  |
2786 | * When reading or writing color-mapped images the format should be set to the  |
2787 | * format of the entries in the color-map then png_image_{read,write}_colormap  |
2788 | * called to read or write the color-map and set the format correctly for the  |
2789 | * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly!  |
2790 | *  |
2791 | * NOTE: libpng can be built with particular features disabled. If you see  |
2792 | * compiler errors because the definition of one of the following flags has been  |
2793 | * compiled out it is because libpng does not have the required support. It is  |
2794 | * possible, however, for the libpng configuration to enable the format on just  |
2795 | * read or just write; in that case you may see an error at run time. You can  |
2796 | * guard against this by checking for the definition of the appropriate  |
2797 | * "_SUPPORTED" macro, one of:  |
2798 | *  |
2799 | * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED  |
2800 | */  |
2801 | #define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */  |
2802 | #define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */  |
2803 | #define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2-byte channels else 1-byte */  |
2804 | #define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */  |
2805 |   |
2806 | #ifdef PNG_FORMAT_BGR_SUPPORTED  |
2807 | # define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */  |
2808 | #endif  |
2809 |   |
2810 | #ifdef PNG_FORMAT_AFIRST_SUPPORTED  |
2811 | # define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */  |
2812 | #endif  |
2813 |   |
2814 | #define PNG_FORMAT_FLAG_ASSOCIATED_ALPHA 0x40U /* alpha channel is associated */  |
2815 |   |
2816 | /* Commonly used formats have predefined macros.  |
2817 | *  |
2818 | * First the single byte (sRGB) formats:  |
2819 | */  |
2820 | #define PNG_FORMAT_GRAY 0  |
2821 | #define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA  |
2822 | #define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST)  |
2823 | #define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR  |
2824 | #define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR)  |
2825 | #define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA)  |
2826 | #define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST)  |
2827 | #define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA)  |
2828 | #define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST)  |
2829 |   |
2830 | /* Then the linear 2-byte formats. When naming these "Y" is used to  |
2831 | * indicate a luminance (gray) channel.  |
2832 | */  |
2833 | #define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR  |
2834 | #define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA)  |
2835 | #define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR)  |
2836 | #define PNG_FORMAT_LINEAR_RGB_ALPHA \  |
2837 | (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA)  |
2838 |   |
2839 | /* With color-mapped formats the image data is one byte for each pixel, the byte  |
2840 | * is an index into the color-map which is formatted as above. To obtain a  |
2841 | * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP  |
2842 | * to one of the above definitions, or you can use one of the definitions below.  |
2843 | */  |
2844 | #define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP)  |
2845 | #define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP)  |
2846 | #define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP)  |
2847 | #define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP)  |
2848 | #define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP)  |
2849 | #define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP)  |
2850 |   |
2851 | /* PNG_IMAGE macros  |
2852 | *  |
2853 | * These are convenience macros to derive information from a png_image  |
2854 | * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the  |
2855 | * actual image sample values - either the entries in the color-map or the  |
2856 | * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values  |
2857 | * for the pixels and will always return 1 for color-mapped formats. The  |
2858 | * remaining macros return information about the rows in the image and the  |
2859 | * complete image.  |
2860 | *  |
2861 | * NOTE: All the macros that take a png_image::format parameter are compile time  |
2862 | * constants if the format parameter is, itself, a constant. Therefore these  |
2863 | * macros can be used in array declarations and case labels where required.  |
2864 | * Similarly the macros are also pre-processor constants (sizeof is not used) so  |
2865 | * they can be used in #if tests.  |
2866 | *  |
2867 | * First the information about the samples.  |
2868 | */  |
2869 | #define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\  |
2870 | (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1)  |
2871 | /* Return the total number of channels in a given format: 1..4 */  |
2872 |   |
2873 | #define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\  |
2874 | ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1)  |
2875 | /* Return the size in bytes of a single component of a pixel or color-map  |
2876 | * entry (as appropriate) in the image: 1 or 2.  |
2877 | */  |
2878 |   |
2879 | #define PNG_IMAGE_SAMPLE_SIZE(fmt)\  |
2880 | (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt))  |
2881 | /* This is the size of the sample data for one sample. If the image is  |
2882 | * color-mapped it is the size of one color-map entry (and image pixels are  |
2883 | * one byte in size), otherwise it is the size of one image pixel.  |
2884 | */  |
2885 |   |
2886 | #define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\  |
2887 | (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256)  |
2888 | /* The maximum size of the color-map required by the format expressed in a  |
2889 | * count of components. This can be used to compile-time allocate a  |
2890 | * color-map:  |
2891 | *  |
2892 | * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)];  |
2893 | *  |
2894 | * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)];  |
2895 | *  |
2896 | * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the  |
2897 | * information from one of the png_image_begin_read_ APIs and dynamically  |
2898 | * allocate the required memory.  |
2899 | */  |
2900 |   |
2901 | /* Corresponding information about the pixels */  |
2902 | #define PNG_IMAGE_PIXEL_(test,fmt)\  |
2903 | (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt))  |
2904 |   |
2905 | #define PNG_IMAGE_PIXEL_CHANNELS(fmt)\  |
2906 | PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt)  |
2907 | /* The number of separate channels (components) in a pixel; 1 for a  |
2908 | * color-mapped image.  |
2909 | */  |
2910 |   |
2911 | #define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\  |
2912 | PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt)  |
2913 | /* The size, in bytes, of each component in a pixel; 1 for a color-mapped  |
2914 | * image.  |
2915 | */  |
2916 |   |
2917 | #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt)  |
2918 | /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */  |
2919 |   |
2920 | /* Information about the whole row, or whole image */  |
2921 | #define PNG_IMAGE_ROW_STRIDE(image)\  |
2922 | (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width)  |
2923 | /* Return the total number of components in a single row of the image; this  |
2924 | * is the minimum 'row stride', the minimum count of components between each  |
2925 | * row. For a color-mapped image this is the minimum number of bytes in a  |
2926 | * row.  |
2927 | *  |
2928 | * WARNING: this macro overflows for some images with more than one component  |
2929 | * and very large image widths. libpng will refuse to process an image where  |
2930 | * this macro would overflow.  |
2931 | */  |
2932 |   |
2933 | #define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\  |
2934 | (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride))  |
2935 | /* Return the size, in bytes, of an image buffer given a png_image and a row  |
2936 | * stride - the number of components to leave space for in each row.  |
2937 | *  |
2938 | * WARNING: this macro overflows a 32-bit integer for some large PNG images,  |
2939 | * libpng will refuse to process an image where such an overflow would occur.  |
2940 | */  |
2941 |   |
2942 | #define PNG_IMAGE_SIZE(image)\  |
2943 | PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image))  |
2944 | /* Return the size, in bytes, of the image in memory given just a png_image;  |
2945 | * the row stride is the minimum stride required for the image.  |
2946 | */  |
2947 |   |
2948 | #define PNG_IMAGE_COLORMAP_SIZE(image)\  |
2949 | (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries)  |
2950 | /* Return the size, in bytes, of the color-map of this image. If the image  |
2951 | * format is not a color-map format this will return a size sufficient for  |
2952 | * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if  |
2953 | * you don't want to allocate a color-map in this case.  |
2954 | */  |
2955 |   |
2956 | /* PNG_IMAGE_FLAG_*  |
2957 | *  |
2958 | * Flags containing additional information about the image are held in the  |
2959 | * 'flags' field of png_image.  |
2960 | */  |
2961 | #define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01  |
2962 | /* This indicates that the RGB values of the in-memory bitmap do not  |
2963 | * correspond to the red, green and blue end-points defined by sRGB.  |
2964 | */  |
2965 |   |
2966 | #define PNG_IMAGE_FLAG_FAST 0x02  |
2967 | /* On write emphasise speed over compression; the resultant PNG file will be  |
2968 | * larger but will be produced significantly faster, particular for large  |
2969 | * images. Do not use this option for images which will be distributed, only  |
2970 | * used it when producing intermediate files that will be read back in  |
2971 | * repeatedly. For a typical 24-bit image the option will double the read  |
2972 | * speed at the cost of increasing the image size by 25%, however for many  |
2973 | * more compressible images the PNG file can be 10 times larger with only a  |
2974 | * slight speed gain.  |
2975 | */  |
2976 |   |
2977 | #define PNG_IMAGE_FLAG_16BIT_sRGB 0x04  |
2978 | /* On read if the image is a 16-bit per component image and there is no gAMA  |
2979 | * or sRGB chunk assume that the components are sRGB encoded. Notice that  |
2980 | * images output by the simplified API always have gamma information; setting  |
2981 | * this flag only affects the interpretation of 16-bit images from an  |
2982 | * external source. It is recommended that the application expose this flag  |
2983 | * to the user; the user can normally easily recognize the difference between  |
2984 | * linear and sRGB encoding. This flag has no effect on write - the data  |
2985 | * passed to the write APIs must have the correct encoding (as defined  |
2986 | * above.)  |
2987 | *  |
2988 | * If the flag is not set (the default) input 16-bit per component data is  |
2989 | * assumed to be linear.  |
2990 | *  |
2991 | * NOTE: the flag can only be set after the png_image_begin_read_ call,  |
2992 | * because that call initializes the 'flags' field.  |
2993 | */  |
2994 |   |
2995 | #ifdef PNG_SIMPLIFIED_READ_SUPPORTED  |
2996 | /* READ APIs  |
2997 | * ---------  |
2998 | *  |
2999 | * The png_image passed to the read APIs must have been initialized by setting  |
3000 | * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.)  |
3001 | */  |
3002 | #ifdef PNG_STDIO_SUPPORTED  |
3003 | PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image,  |
3004 | const char *file_name));  |
3005 | /* The named file is opened for read and the image header is filled in  |
3006 | * from the PNG header in the file.  |
3007 | */  |
3008 |   |
3009 | PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image,  |
3010 | FILE* file));  |
3011 | /* The PNG header is read from the stdio FILE object. */  |
3012 | #endif /* STDIO */  |
3013 |   |
3014 | PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image,  |
3015 | png_const_voidp memory, size_t size));  |
3016 | /* The PNG header is read from the given memory buffer. */  |
3017 |   |
3018 | PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image,  |
3019 | png_const_colorp background, void *buffer, png_int_32 row_stride,  |
3020 | void *colormap));  |
3021 | /* Finish reading the image into the supplied buffer and clean up the  |
3022 | * png_image structure.  |
3023 | *  |
3024 | * row_stride is the step, in byte or 2-byte units as appropriate,  |
3025 | * between adjacent rows. A positive stride indicates that the top-most row  |
3026 | * is first in the buffer - the normal top-down arrangement. A negative  |
3027 | * stride indicates that the bottom-most row is first in the buffer.  |
3028 | *  |
3029 | * background need only be supplied if an alpha channel must be removed from  |
3030 | * a png_byte format and the removal is to be done by compositing on a solid  |
3031 | * color; otherwise it may be NULL and any composition will be done directly  |
3032 | * onto the buffer. The value is an sRGB color to use for the background,  |
3033 | * for grayscale output the green channel is used.  |
3034 | *  |
3035 | * background must be supplied when an alpha channel must be removed from a  |
3036 | * single byte color-mapped output format, in other words if:  |
3037 | *  |
3038 | * 1) The original format from png_image_begin_read_from_* had  |
3039 | * PNG_FORMAT_FLAG_ALPHA set.  |
3040 | * 2) The format set by the application does not.  |
3041 | * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and  |
3042 | * PNG_FORMAT_FLAG_LINEAR *not* set.  |
3043 | *  |
3044 | * For linear output removing the alpha channel is always done by compositing  |
3045 | * on black and background is ignored.  |
3046 | *  |
3047 | * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must  |
3048 | * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE.  |
3049 | * image->colormap_entries will be updated to the actual number of entries  |
3050 | * written to the colormap; this may be less than the original value.  |
3051 | */  |
3052 |   |
3053 | PNG_EXPORT(238, void, png_image_free, (png_imagep image));  |
3054 | /* Free any data allocated by libpng in image->opaque, setting the pointer to  |
3055 | * NULL. May be called at any time after the structure is initialized.  |
3056 | */  |
3057 | #endif /* SIMPLIFIED_READ */  |
3058 |   |
3059 | #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED  |
3060 | /* WRITE APIS  |
3061 | * ----------  |
3062 | * For write you must initialize a png_image structure to describe the image to  |
3063 | * be written. To do this use memset to set the whole structure to 0 then  |
3064 | * initialize fields describing your image.  |
3065 | *  |
3066 | * version: must be set to PNG_IMAGE_VERSION  |
3067 | * opaque: must be initialized to NULL  |
3068 | * width: image width in pixels  |
3069 | * height: image height in rows  |
3070 | * format: the format of the data (image and color-map) you wish to write  |
3071 | * flags: set to 0 unless one of the defined flags applies; set  |
3072 | * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB  |
3073 | * values do not correspond to the colors in sRGB.  |
3074 | * colormap_entries: set to the number of entries in the color-map (0 to 256)  |
3075 | */  |
3076 | #ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED  |
3077 | PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image,  |
3078 | const char *file, int convert_to_8bit, const void *buffer,  |
3079 | png_int_32 row_stride, const void *colormap));  |
3080 | /* Write the image to the named file. */  |
3081 |   |
3082 | PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file,  |
3083 | int convert_to_8_bit, const void *buffer, png_int_32 row_stride,  |
3084 | const void *colormap));  |
3085 | /* Write the image to the given (FILE*). */  |
3086 | #endif /* SIMPLIFIED_WRITE_STDIO */  |
3087 |   |
3088 | /* With all write APIs if image is in one of the linear formats with 16-bit  |
3089 | * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG  |
3090 | * gamma encoded according to the sRGB specification, otherwise a 16-bit linear  |
3091 | * encoded PNG file is written.  |
3092 | *  |
3093 | * With color-mapped data formats the colormap parameter point to a color-map  |
3094 | * with at least image->colormap_entries encoded in the specified format. If  |
3095 | * the format is linear the written PNG color-map will be converted to sRGB  |
3096 | * regardless of the convert_to_8_bit flag.  |
3097 | *  |
3098 | * With all APIs row_stride is handled as in the read APIs - it is the spacing  |
3099 | * from one row to the next in component sized units (1 or 2 bytes) and if  |
3100 | * negative indicates a bottom-up row layout in the buffer. If row_stride is  |
3101 | * zero, libpng will calculate it for you from the image width and number of  |
3102 | * channels.  |
3103 | *  |
3104 | * Note that the write API does not support interlacing, sub-8-bit pixels or  |
3105 | * most ancillary chunks. If you need to write text chunks (e.g. for copyright  |
3106 | * notices) you need to use one of the other APIs.  |
3107 | */  |
3108 |   |
3109 | PNG_EXPORT(245, int, png_image_write_to_memory, (png_imagep image, void *memory,  |
3110 | png_alloc_size_t * PNG_RESTRICT memory_bytes, int convert_to_8_bit,  |
3111 | const void *buffer, png_int_32 row_stride, const void *colormap));  |
3112 | /* Write the image to the given memory buffer. The function both writes the  |
3113 | * whole PNG data stream to *memory and updates *memory_bytes with the count  |
3114 | * of bytes written.  |
3115 | *  |
3116 | * 'memory' may be NULL. In this case *memory_bytes is not read however on  |
3117 | * success the number of bytes which would have been written will still be  |
3118 | * stored in *memory_bytes. On failure *memory_bytes will contain 0.  |
3119 | *  |
3120 | * If 'memory' is not NULL it must point to memory[*memory_bytes] of  |
3121 | * writeable memory.  |
3122 | *  |
3123 | * If the function returns success memory[*memory_bytes] (if 'memory' is not  |
3124 | * NULL) contains the written PNG data. *memory_bytes will always be less  |
3125 | * than or equal to the original value.  |
3126 | *  |
3127 | * If the function returns false and *memory_bytes was not changed an error  |
3128 | * occurred during write. If *memory_bytes was changed, or is not 0 if  |
3129 | * 'memory' was NULL, the write would have succeeded but for the memory  |
3130 | * buffer being too small. *memory_bytes contains the required number of  |
3131 | * bytes and will be bigger that the original value.  |
3132 | */  |
3133 |   |
3134 | #define png_image_write_get_memory_size(image, size, convert_to_8_bit, buffer,\  |
3135 | row_stride, colormap)\  |
3136 | png_image_write_to_memory(&(image), 0, &(size), convert_to_8_bit, buffer,\  |
3137 | row_stride, colormap)  |
3138 | /* Return the amount of memory in 'size' required to compress this image.  |
3139 | * The png_image structure 'image' must be filled in as in the above  |
3140 | * function and must not be changed before the actual write call, the buffer  |
3141 | * and all other parameters must also be identical to that in the final  |
3142 | * write call. The 'size' variable need not be initialized.  |
3143 | *  |
3144 | * NOTE: the macro returns true/false, if false is returned 'size' will be  |
3145 | * set to zero and the write failed and probably will fail if tried again.  |
3146 | */  |
3147 |   |
3148 | /* You can pre-allocate the buffer by making sure it is of sufficient size  |
3149 | * regardless of the amount of compression achieved. The buffer size will  |
3150 | * always be bigger than the original image and it will never be filled. The  |
3151 | * following macros are provided to assist in allocating the buffer.  |
3152 | */  |
3153 | #define PNG_IMAGE_DATA_SIZE(image) (PNG_IMAGE_SIZE(image)+(image).height)  |
3154 | /* The number of uncompressed bytes in the PNG byte encoding of the image;  |
3155 | * uncompressing the PNG IDAT data will give this number of bytes.  |
3156 | *  |
3157 | * NOTE: while PNG_IMAGE_SIZE cannot overflow for an image in memory this  |
3158 | * macro can because of the extra bytes used in the PNG byte encoding. You  |
3159 | * need to avoid this macro if your image size approaches 2^30 in width or  |
3160 | * height. The same goes for the remainder of these macros; they all produce  |
3161 | * bigger numbers than the actual in-memory image size.  |
3162 | */  |
3163 | #ifndef PNG_ZLIB_MAX_SIZE  |
3164 | # define PNG_ZLIB_MAX_SIZE(b) ((b)+(((b)+7U)>>3)+(((b)+63U)>>6)+11U)  |
3165 | /* An upper bound on the number of compressed bytes given 'b' uncompressed  |
3166 | * bytes. This is based on deflateBounds() in zlib; different  |
3167 | * implementations of zlib compression may conceivably produce more data so  |
3168 | * if your zlib implementation is not zlib itself redefine this macro  |
3169 | * appropriately.  |
3170 | */  |
3171 | #endif  |
3172 |   |
3173 | #define PNG_IMAGE_COMPRESSED_SIZE_MAX(image)\  |
3174 | PNG_ZLIB_MAX_SIZE((png_alloc_size_t)PNG_IMAGE_DATA_SIZE(image))  |
3175 | /* An upper bound on the size of the data in the PNG IDAT chunks. */  |
3176 |   |
3177 | #define PNG_IMAGE_PNG_SIZE_MAX_(image, image_size)\  |
3178 | ((8U/*sig*/+25U/*IHDR*/+16U/*gAMA*/+44U/*cHRM*/+12U/*IEND*/+\  |
3179 | (((image).format&PNG_FORMAT_FLAG_COLORMAP)?/*colormap: PLTE, tRNS*/\  |
3180 | 12U+3U*(image).colormap_entries/*PLTE data*/+\  |
3181 | (((image).format&PNG_FORMAT_FLAG_ALPHA)?\  |
3182 | 12U/*tRNS*/+(image).colormap_entries:0U):0U)+\  |
3183 | 12U)+(12U*((image_size)/PNG_ZBUF_SIZE))/*IDAT*/+(image_size))  |
3184 | /* A helper for the following macro; if your compiler cannot handle the  |
3185 | * following macro use this one with the result of  |
3186 | * PNG_IMAGE_COMPRESSED_SIZE_MAX(image) as the second argument (most  |
3187 | * compilers should handle this just fine.)  |
3188 | */  |
3189 |   |
3190 | #define PNG_IMAGE_PNG_SIZE_MAX(image)\  |
3191 | PNG_IMAGE_PNG_SIZE_MAX_(image, PNG_IMAGE_COMPRESSED_SIZE_MAX(image))  |
3192 | /* An upper bound on the total length of the PNG data stream for 'image'.  |
3193 | * The result is of type png_alloc_size_t, on 32-bit systems this may  |
3194 | * overflow even though PNG_IMAGE_DATA_SIZE does not overflow; the write will  |
3195 | * run out of buffer space but return a corrected size which should work.  |
3196 | */  |
3197 | #endif /* SIMPLIFIED_WRITE */  |
3198 | /*******************************************************************************  |
3199 | * END OF SIMPLIFIED API  |
3200 | ******************************************************************************/  |
3201 | #endif /* SIMPLIFIED_{READ|WRITE} */  |
3202 |   |
3203 | /*******************************************************************************  |
3204 | * Section 6: IMPLEMENTATION OPTIONS  |
3205 | *******************************************************************************  |
3206 | *  |
3207 | * Support for arbitrary implementation-specific optimizations. The API allows  |
3208 | * particular options to be turned on or off. 'Option' is the number of the  |
3209 | * option and 'onoff' is 0 (off) or non-0 (on). The value returned is given  |
3210 | * by the PNG_OPTION_ defines below.  |
3211 | *  |
3212 | * HARDWARE: normally hardware capabilities, such as the Intel SSE instructions,  |
3213 | * are detected at run time, however sometimes it may be impossible  |
3214 | * to do this in user mode, in which case it is necessary to discover  |
3215 | * the capabilities in an OS specific way. Such capabilities are  |
3216 | * listed here when libpng has support for them and must be turned  |
3217 | * ON by the application if present.  |
3218 | *  |
3219 | * SOFTWARE: sometimes software optimizations actually result in performance  |
3220 | * decrease on some architectures or systems, or with some sets of  |
3221 | * PNG images. 'Software' options allow such optimizations to be  |
3222 | * selected at run time.  |
3223 | */  |
3224 | #ifdef PNG_SET_OPTION_SUPPORTED  |
3225 | #ifdef PNG_ARM_NEON_API_SUPPORTED  |
3226 | # define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */  |
3227 | #endif  |
3228 | #define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */  |
3229 | #define PNG_SKIP_sRGB_CHECK_PROFILE 4 /* SOFTWARE: Check ICC profile for sRGB */  |
3230 | #ifdef PNG_MIPS_MSA_API_SUPPORTED  |
3231 | # define PNG_MIPS_MSA 6 /* HARDWARE: MIPS Msa SIMD instructions supported */  |
3232 | #endif  |
3233 | #define PNG_IGNORE_ADLER32 8  |
3234 | #ifdef PNG_POWERPC_VSX_API_SUPPORTED  |
3235 | # define PNG_POWERPC_VSX 10 /* HARDWARE: PowerPC VSX SIMD instructions supported */  |
3236 | #endif  |
3237 | #define PNG_OPTION_NEXT 12 /* Next option - numbers must be even */  |
3238 |   |
3239 | /* Return values: NOTE: there are four values and 'off' is *not* zero */  |
3240 | #define PNG_OPTION_UNSET 0 /* Unset - defaults to off */  |
3241 | #define PNG_OPTION_INVALID 1 /* Option number out of range */  |
3242 | #define PNG_OPTION_OFF 2  |
3243 | #define PNG_OPTION_ON 3  |
3244 |   |
3245 | PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option,  |
3246 | int onoff));  |
3247 | #endif /* SET_OPTION */  |
3248 |   |
3249 | /*******************************************************************************  |
3250 | * END OF HARDWARE AND SOFTWARE OPTIONS  |
3251 | ******************************************************************************/  |
3252 | #ifdef PNG_APNG_SUPPORTED  |
3253 | PNG_EXPORT(250, png_uint_32, png_get_acTL, (png_structp png_ptr,  |
3254 | png_infop info_ptr, png_uint_32 *num_frames, png_uint_32 *num_plays));  |
3255 |   |
3256 | PNG_EXPORT(251, png_uint_32, png_set_acTL, (png_structp png_ptr,  |
3257 | png_infop info_ptr, png_uint_32 num_frames, png_uint_32 num_plays));  |
3258 |   |
3259 | PNG_EXPORT(252, png_uint_32, png_get_num_frames, (png_structp png_ptr,  |
3260 | png_infop info_ptr));  |
3261 |   |
3262 | PNG_EXPORT(253, png_uint_32, png_get_num_plays, (png_structp png_ptr,  |
3263 | png_infop info_ptr));  |
3264 |   |
3265 | PNG_EXPORT(254, png_uint_32, png_get_next_frame_fcTL,  |
3266 | (png_structp png_ptr, png_infop info_ptr, png_uint_32 *width,  |
3267 | png_uint_32 *height, png_uint_32 *x_offset, png_uint_32 *y_offset,  |
3268 | png_uint_16 *delay_num, png_uint_16 *delay_den, png_byte *dispose_op,  |
3269 | png_byte *blend_op));  |
3270 |   |
3271 | PNG_EXPORT(255, png_uint_32, png_set_next_frame_fcTL,  |
3272 | (png_structp png_ptr, png_infop info_ptr, png_uint_32 width,  |
3273 | png_uint_32 height, png_uint_32 x_offset, png_uint_32 y_offset,  |
3274 | png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,  |
3275 | png_byte blend_op));  |
3276 |   |
3277 | PNG_EXPORT(256, png_uint_32, png_get_next_frame_width,  |
3278 | (png_structp png_ptr, png_infop info_ptr));  |
3279 | PNG_EXPORT(257, png_uint_32, png_get_next_frame_height,  |
3280 | (png_structp png_ptr, png_infop info_ptr));  |
3281 | PNG_EXPORT(258, png_uint_32, png_get_next_frame_x_offset,  |
3282 | (png_structp png_ptr, png_infop info_ptr));  |
3283 | PNG_EXPORT(259, png_uint_32, png_get_next_frame_y_offset,  |
3284 | (png_structp png_ptr, png_infop info_ptr));  |
3285 | PNG_EXPORT(260, png_uint_16, png_get_next_frame_delay_num,  |
3286 | (png_structp png_ptr, png_infop info_ptr));  |
3287 | PNG_EXPORT(261, png_uint_16, png_get_next_frame_delay_den,  |
3288 | (png_structp png_ptr, png_infop info_ptr));  |
3289 | PNG_EXPORT(262, png_byte, png_get_next_frame_dispose_op,  |
3290 | (png_structp png_ptr, png_infop info_ptr));  |
3291 | PNG_EXPORT(263, png_byte, png_get_next_frame_blend_op,  |
3292 | (png_structp png_ptr, png_infop info_ptr));  |
3293 | PNG_EXPORT(264, png_byte, png_get_first_frame_is_hidden,  |
3294 | (png_structp png_ptr, png_infop info_ptr));  |
3295 | PNG_EXPORT(265, png_uint_32, png_set_first_frame_is_hidden,  |
3296 | (png_structp png_ptr, png_infop info_ptr, png_byte is_hidden));  |
3297 |   |
3298 | #ifdef PNG_READ_APNG_SUPPORTED  |
3299 | PNG_EXPORT(266, void, png_read_frame_head, (png_structp png_ptr,  |
3300 | png_infop info_ptr));  |
3301 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED  |
3302 | PNG_EXPORT(267, void, png_set_progressive_frame_fn, (png_structp png_ptr,  |
3303 | png_progressive_frame_ptr frame_info_fn,  |
3304 | png_progressive_frame_ptr frame_end_fn));  |
3305 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */  |
3306 | #endif /* PNG_READ_APNG_SUPPORTED */  |
3307 |   |
3308 | #ifdef PNG_WRITE_APNG_SUPPORTED  |
3309 | PNG_EXPORT(268, void, png_write_frame_head, (png_structp png_ptr,  |
3310 | png_infop info_ptr, png_bytepp row_pointers,  |
3311 | png_uint_32 width, png_uint_32 height,  |
3312 | png_uint_32 x_offset, png_uint_32 y_offset,  |
3313 | png_uint_16 delay_num, png_uint_16 delay_den, png_byte dispose_op,  |
3314 | png_byte blend_op));  |
3315 |   |
3316 | PNG_EXPORT(269, void, png_write_frame_tail, (png_structp png_ptr,  |
3317 | png_infop info_ptr));  |
3318 | #endif /* PNG_WRITE_APNG_SUPPORTED */  |
3319 | #endif /* PNG_APNG_SUPPORTED */  |
3320 |   |
3321 | /* Maintainer: Put new public prototypes here ^, in libpng.3, in project  |
3322 | * defs, and in scripts/symbols.def.  |
3323 | */  |
3324 |   |
3325 | /* The last ordinal number (this is the *last* one already used; the next  |
3326 | * one to use is one more than this.)  |
3327 | */  |
3328 | #ifdef PNG_EXPORT_LAST_ORDINAL  |
3329 | #ifdef PNG_APNG_SUPPORTED  |
3330 | PNG_EXPORT_LAST_ORDINAL(269);  |
3331 | #else  |
3332 | PNG_EXPORT_LAST_ORDINAL(249);  |
3333 | #endif /* PNG_APNG_SUPPORTED */  |
3334 | #endif  |
3335 |   |
3336 | #ifdef __cplusplus  |
3337 | }  |
3338 | #endif  |
3339 |   |
3340 | #endif /* PNG_VERSION_INFO_ONLY */  |
3341 | /* Do not put anything past this line */  |
3342 | #endif /* PNG_H */  |
3343 | |