1
2/* png.h - header file for PNG reference library
3 *
4 * libpng version 1.2.54, November 12, 2015
5 *
6 * Copyright (c) 1998-2015 Glenn Randers-Pehrson
7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
9 *
10 * This code is released under the libpng license (See LICENSE, below)
11 *
12 * Authors and maintainers:
13 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
14 * libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger
15 * libpng versions 0.97, January 1998, through 1.2.54, November 12, 2015: Glenn
16 * See also "Contributing Authors", below.
17 */
18
19/*
20 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
21 *
22 * If you modify libpng you may insert additional notices immediately following
23 * this sentence.
24 *
25 * This code is released under the libpng license.
26 *
27 * libpng versions 1.0.7, July 1, 2000, through 1.2.54, November 12, 2015, are
28 * Copyright (c) 2000-2002, 2004, 2006-2015 Glenn Randers-Pehrson, are
29 * derived from libpng-1.0.6, and are distributed according to the same
30 * disclaimer and license as libpng-1.0.6 with the following individuals
31 * added to the list of Contributing Authors:
32 *
33 * Simon-Pierre Cadieux
34 * Eric S. Raymond
35 * Cosmin Truta
36 * Gilles Vollant
37 *
38 * and with the following additions to the disclaimer:
39 *
40 * There is no warranty against interference with your enjoyment of the
41 * library or against infringement. There is no warranty that our
42 * efforts or the library will fulfill any of your particular purposes
43 * or needs. This library is provided with all faults, and the entire
44 * risk of satisfactory quality, performance, accuracy, and effort is with
45 * the user.
46 *
47 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
48 * Copyright (c) 1998-2000 Glenn Randers-Pehrson, are derived from
49 * libpng-0.96, and are distributed according to the same disclaimer and
50 * license as libpng-0.96, with the following individuals added to the list
51 * of Contributing Authors:
52 *
53 * Tom Lane
54 * Glenn Randers-Pehrson
55 * Willem van Schaik
56 *
57 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
58 * Copyright (c) 1996-1997 Andreas Dilger, are derived from libpng-0.88,
59 * and are distributed according to the same disclaimer and license as
60 * libpng-0.88, with the following individuals added to the list of
61 * Contributing Authors:
62 *
63 * John Bowler
64 * Kevin Bracey
65 * Sam Bushell
66 * Magnus Holmgren
67 * Greg Roelofs
68 * Tom Tanner
69 *
70 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
71 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
72 *
73 * For the purposes of this copyright and license, "Contributing Authors"
74 * is defined as the following set of individuals:
75 *
76 * Andreas Dilger
77 * Dave Martindale
78 * Guy Eric Schalnat
79 * Paul Schmidt
80 * Tim Wegner
81 *
82 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
83 * and Group 42, Inc. disclaim all warranties, expressed or implied,
84 * including, without limitation, the warranties of merchantability and of
85 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
86 * assume no liability for direct, indirect, incidental, special, exemplary,
87 * or consequential damages, which may result from the use of the PNG
88 * Reference Library, even if advised of the possibility of such damage.
89 *
90 * Permission is hereby granted to use, copy, modify, and distribute this
91 * source code, or portions hereof, for any purpose, without fee, subject
92 * to the following restrictions:
93 *
94 * 1. The origin of this source code must not be misrepresented.
95 *
96 * 2. Altered versions must be plainly marked as such and must not
97 * be misrepresented as being the original source.
98 *
99 * 3. This Copyright notice may not be removed or altered from any
100 * source or altered source distribution.
101 *
102 * The Contributing Authors and Group 42, Inc. specifically permit, without
103 * fee, and encourage the use of this source code as a component to
104 * supporting the PNG file format in commercial products. If you use this
105 * source code in a product, acknowledgment is not required but would be
106 * appreciated.
107 *
108 * END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE.
109 */
110
111/*
112 * A "png_get_copyright" function is available, for convenient use in "about"
113 * boxes and the like:
114 *
115 * printf("%s", png_get_copyright(NULL));
116 *
117 * Also, the PNG logo (in PNG format, of course) is supplied in the
118 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
119 */
120
121/*
122 * Libpng is OSI Certified Open Source Software. OSI Certified Open Source is
123 * a certification mark of the Open Source Initiative. OSI has not addressed
124 * the additional disclaimers inserted at version 1.0.7.
125 */
126
127/*
128 * The contributing authors would like to thank all those who helped
129 * with testing, bug fixes, and patience. This wouldn't have been
130 * possible without all of you.
131 *
132 * Thanks to Frank J. T. Wojcik for helping with the documentation.
133 */
134
135/* Note about libpng version numbers:
136 *
137 * Due to various miscommunications, unforeseen code incompatibilities
138 * and occasional factors outside the authors' control, version numbering
139 * on the library has not always been consistent and straightforward.
140 * The following table summarizes matters since version 0.89c, which was
141 * the first widely used release:
142 *
143 * source png.h png.h shared-lib
144 * version string int version
145 * ------- ------ ----- ----------
146 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
147 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
148 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
149 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
150 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
151 * 0.97c 0.97 97 2.0.97
152 * 0.98 0.98 98 2.0.98
153 * 0.99 0.99 98 2.0.99
154 * 0.99a-m 0.99 99 2.0.99
155 * 1.00 1.00 100 2.1.0 [100 should be 10000]
156 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
157 * 1.0.1 png.h string is 10001 2.1.0
158 * 1.0.1a-e identical to the 10002 from here on, the shared library
159 * 1.0.2 source version) 10002 is 2.V where V is the source code
160 * 1.0.2a-b 10003 version, except as noted.
161 * 1.0.3 10003
162 * 1.0.3a-d 10004
163 * 1.0.4 10004
164 * 1.0.4a-f 10005
165 * 1.0.5 (+ 2 patches) 10005
166 * 1.0.5a-d 10006
167 * 1.0.5e-r 10100 (not source compatible)
168 * 1.0.5s-v 10006 (not binary compatible)
169 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
170 * 1.0.6d-f 10007 (still binary incompatible)
171 * 1.0.6g 10007
172 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
173 * 1.0.6i 10007 10.6i
174 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
175 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
176 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
177 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
178 * 1.0.7 1 10007 (still compatible)
179 * ...
180 * 1.0.19 10 10019 10.so.0.19[.0]
181 * ...
182 * 1.0.64 10 10064 10.so.0.64[.0]
183 * 1.2.54 13 10254 12.so.0.54[.0]
184 *
185 * Henceforth the source version will match the shared-library major
186 * and minor numbers; the shared-library major version number will be
187 * used for changes in backward compatibility, as it is intended. The
188 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
189 * for applications, is an unsigned integer of the form xyyzz corresponding
190 * to the source version x.y.z (leading zeros in y and z). Beta versions
191 * were given the previous public release number plus a letter, until
192 * version 1.0.6j; from then on they were given the upcoming public
193 * release number plus "betaNN" or "rcNN".
194 *
195 * Binary incompatibility exists only when applications make direct access
196 * to the info_ptr or png_ptr members through png.h, and the compiled
197 * application is loaded with a different version of the library.
198 *
199 * DLLNUM will change each time there are forward or backward changes
200 * in binary compatibility (e.g., when a new feature is added).
201 *
202 * See libpng.txt or libpng.3 for more information. The PNG specification
203 * is available as a W3C Recommendation and as an ISO Specification,
204 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
205 */
206
207/*
208 * Y2K compliance in libpng:
209 * =========================
210 *
211 * November 12, 2015
212 *
213 * Since the PNG Development group is an ad-hoc body, we can't make
214 * an official declaration.
215 *
216 * This is your unofficial assurance that libpng from version 0.71 and
217 * upward through 1.2.54 are Y2K compliant. It is my belief that earlier
218 * versions were also Y2K compliant.
219 *
220 * Libpng only has three year fields. One is a 2-byte unsigned integer
221 * that will hold years up to 65535. The other two hold the date in text
222 * format, and will hold years up to 9999.
223 *
224 * The integer is
225 * "png_uint_16 year" in png_time_struct.
226 *
227 * The strings are
228 * "png_charp time_buffer" in png_struct and
229 * "near_time_buffer", which is a local character string in png.c.
230 *
231 * There are seven time-related functions:
232 * png.c: png_convert_to_rfc_1123() in png.c
233 * (formerly png_convert_to_rfc_1152() in error)
234 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
235 * png_convert_from_time_t() in pngwrite.c
236 * png_get_tIME() in pngget.c
237 * png_handle_tIME() in pngrutil.c, called in pngread.c
238 * png_set_tIME() in pngset.c
239 * png_write_tIME() in pngwutil.c, called in pngwrite.c
240 *
241 * All handle dates properly in a Y2K environment. The
242 * png_convert_from_time_t() function calls gmtime() to convert from system
243 * clock time, which returns (year - 1900), which we properly convert to
244 * the full 4-digit year. There is a possibility that applications using
245 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
246 * function, or that they are incorrectly passing only a 2-digit year
247 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
248 * but this is not under our control. The libpng documentation has always
249 * stated that it works with 4-digit years, and the APIs have been
250 * documented as such.
251 *
252 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
253 * integer to hold the year, and can hold years as large as 65535.
254 *
255 * zlib, upon which libpng depends, is also Y2K compliant. It contains
256 * no date-related code.
257 *
258 * Glenn Randers-Pehrson
259 * libpng maintainer
260 * PNG Development Group
261 */
262
263#ifndef PNG_H
264#define PNG_H
265
266/* This is not the place to learn how to use libpng. The file libpng.txt
267 * describes how to use libpng, and the file example.c summarizes it
268 * with some code on which to build. This file is useful for looking
269 * at the actual function definitions and structure components.
270 */
271
272/* Version information for png.h - this should match the version in png.c */
273#define PNG_LIBPNG_VER_STRING "1.2.54"
274#define PNG_HEADER_VERSION_STRING \
275 " libpng version 1.2.54 - November 12, 2015\n"
276
277#define PNG_LIBPNG_VER_SONUM 0
278#define PNG_LIBPNG_VER_DLLNUM 13
279
280/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
281#define PNG_LIBPNG_VER_MAJOR 1
282#define PNG_LIBPNG_VER_MINOR 2
283#define PNG_LIBPNG_VER_RELEASE 54
284/* This should match the numeric part of the final component of
285 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
286 */
287
288#define PNG_LIBPNG_VER_BUILD 0
289
290/* Release Status */
291#define PNG_LIBPNG_BUILD_ALPHA 1
292#define PNG_LIBPNG_BUILD_BETA 2
293#define PNG_LIBPNG_BUILD_RC 3
294#define PNG_LIBPNG_BUILD_STABLE 4
295#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
296
297/* Release-Specific Flags */
298#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
299 PNG_LIBPNG_BUILD_STABLE only */
300#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
301 PNG_LIBPNG_BUILD_SPECIAL */
302#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
303 PNG_LIBPNG_BUILD_PRIVATE */
304
305#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
306
307/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
308 * We must not include leading zeros.
309 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
310 * version 1.0.0 was mis-numbered 100 instead of 10000). From
311 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
312 */
313#define PNG_LIBPNG_VER 10254 /* 1.2.54 */
314
315#ifndef PNG_VERSION_INFO_ONLY
316/* Include the compression library's header */
317#include "zlib.h"
318#endif
319
320/* Include all user configurable info, including optional assembler routines */
321#include "pngconf.h"
322
323/*
324 * Added at libpng-1.2.8 */
325/* Ref MSDN: Private as priority over Special
326 * VS_FF_PRIVATEBUILD File *was not* built using standard release
327 * procedures. If this value is given, the StringFileInfo block must
328 * contain a PrivateBuild string.
329 *
330 * VS_FF_SPECIALBUILD File *was* built by the original company using
331 * standard release procedures but is a variation of the standard
332 * file of the same version number. If this value is given, the
333 * StringFileInfo block must contain a SpecialBuild string.
334 */
335
336#ifdef PNG_USER_PRIVATEBUILD
337# define PNG_LIBPNG_BUILD_TYPE \
338 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
339#else
340# ifdef PNG_LIBPNG_SPECIALBUILD
341# define PNG_LIBPNG_BUILD_TYPE \
342 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
343# else
344# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
345# endif
346#endif
347
348#ifndef PNG_VERSION_INFO_ONLY
349
350/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
351#ifdef __cplusplus
352extern "C" {
353#endif /* __cplusplus */
354
355/* This file is arranged in several sections. The first section contains
356 * structure and type definitions. The second section contains the external
357 * library functions, while the third has the internal library functions,
358 * which applications aren't expected to use directly.
359 */
360
361#ifndef PNG_NO_TYPECAST_NULL
362#define int_p_NULL (int *)NULL
363#define png_bytep_NULL (png_bytep)NULL
364#define png_bytepp_NULL (png_bytepp)NULL
365#define png_doublep_NULL (png_doublep)NULL
366#define png_error_ptr_NULL (png_error_ptr)NULL
367#define png_flush_ptr_NULL (png_flush_ptr)NULL
368#define png_free_ptr_NULL (png_free_ptr)NULL
369#define png_infopp_NULL (png_infopp)NULL
370#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
371#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
372#define png_rw_ptr_NULL (png_rw_ptr)NULL
373#define png_structp_NULL (png_structp)NULL
374#define png_uint_16p_NULL (png_uint_16p)NULL
375#define png_voidp_NULL (png_voidp)NULL
376#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
377#else
378#define int_p_NULL NULL
379#define png_bytep_NULL NULL
380#define png_bytepp_NULL NULL
381#define png_doublep_NULL NULL
382#define png_error_ptr_NULL NULL
383#define png_flush_ptr_NULL NULL
384#define png_free_ptr_NULL NULL
385#define png_infopp_NULL NULL
386#define png_malloc_ptr_NULL NULL
387#define png_read_status_ptr_NULL NULL
388#define png_rw_ptr_NULL NULL
389#define png_structp_NULL NULL
390#define png_uint_16p_NULL NULL
391#define png_voidp_NULL NULL
392#define png_write_status_ptr_NULL NULL
393#endif
394
395/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
396#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
397/* Version information for C files, stored in png.c. This had better match
398 * the version above.
399 */
400#ifdef PNG_USE_GLOBAL_ARRAYS
401PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
402 /* Need room for 99.99.99beta99z */
403#else
404#define png_libpng_ver png_get_header_ver(NULL)
405#endif
406
407#ifdef PNG_USE_GLOBAL_ARRAYS
408/* This was removed in version 1.0.5c */
409/* Structures to facilitate easy interlacing. See png.c for more details */
410PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
411PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
412PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
413PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
414PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
415PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
416/* This isn't currently used. If you need it, see png.c for more details.
417PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
418*/
419#endif
420
421#endif /* PNG_NO_EXTERN */
422
423/* Three color definitions. The order of the red, green, and blue, (and the
424 * exact size) is not important, although the size of the fields need to
425 * be png_byte or png_uint_16 (as defined below).
426 */
427typedef struct png_color_struct
428{
429 png_byte red;
430 png_byte green;
431 png_byte blue;
432} png_color;
433typedef png_color FAR * png_colorp;
434typedef png_color FAR * FAR * png_colorpp;
435
436typedef struct png_color_16_struct
437{
438 png_byte index; /* used for palette files */
439 png_uint_16 red; /* for use in red green blue files */
440 png_uint_16 green;
441 png_uint_16 blue;
442 png_uint_16 gray; /* for use in grayscale files */
443} png_color_16;
444typedef png_color_16 FAR * png_color_16p;
445typedef png_color_16 FAR * FAR * png_color_16pp;
446
447typedef struct png_color_8_struct
448{
449 png_byte red; /* for use in red green blue files */
450 png_byte green;
451 png_byte blue;
452 png_byte gray; /* for use in grayscale files */
453 png_byte alpha; /* for alpha channel files */
454} png_color_8;
455typedef png_color_8 FAR * png_color_8p;
456typedef png_color_8 FAR * FAR * png_color_8pp;
457
458/*
459 * The following two structures are used for the in-core representation
460 * of sPLT chunks.
461 */
462typedef struct png_sPLT_entry_struct
463{
464 png_uint_16 red;
465 png_uint_16 green;
466 png_uint_16 blue;
467 png_uint_16 alpha;
468 png_uint_16 frequency;
469} png_sPLT_entry;
470typedef png_sPLT_entry FAR * png_sPLT_entryp;
471typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
472
473/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
474 * occupy the LSB of their respective members, and the MSB of each member
475 * is zero-filled. The frequency member always occupies the full 16 bits.
476 */
477
478typedef struct png_sPLT_struct
479{
480 png_charp name; /* palette name */
481 png_byte depth; /* depth of palette samples */
482 png_sPLT_entryp entries; /* palette entries */
483 png_int_32 nentries; /* number of palette entries */
484} png_sPLT_t;
485typedef png_sPLT_t FAR * png_sPLT_tp;
486typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
487
488#ifdef PNG_TEXT_SUPPORTED
489/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
490 * and whether that contents is compressed or not. The "key" field
491 * points to a regular zero-terminated C string. The "text", "lang", and
492 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
493 * However, the * structure returned by png_get_text() will always contain
494 * regular zero-terminated C strings (possibly empty), never NULL pointers,
495 * so they can be safely used in printf() and other string-handling functions.
496 */
497typedef struct png_text_struct
498{
499 int compression; /* compression value:
500 -1: tEXt, none
501 0: zTXt, deflate
502 1: iTXt, none
503 2: iTXt, deflate */
504 png_charp key; /* keyword, 1-79 character description of "text" */
505 png_charp text; /* comment, may be an empty string (ie "")
506 or a NULL pointer */
507 png_size_t text_length; /* length of the text string */
508#ifdef PNG_iTXt_SUPPORTED
509 png_size_t itxt_length; /* length of the itxt string */
510 png_charp lang; /* language code, 0-79 characters
511 or a NULL pointer */
512 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
513 chars or a NULL pointer */
514#endif
515} png_text;
516typedef png_text FAR * png_textp;
517typedef png_text FAR * FAR * png_textpp;
518#endif
519
520/* Supported compression types for text in PNG files (tEXt, and zTXt).
521 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
522 */
523#define PNG_TEXT_COMPRESSION_NONE_WR -3
524#define PNG_TEXT_COMPRESSION_zTXt_WR -2
525#define PNG_TEXT_COMPRESSION_NONE -1
526#define PNG_TEXT_COMPRESSION_zTXt 0
527#define PNG_ITXT_COMPRESSION_NONE 1
528#define PNG_ITXT_COMPRESSION_zTXt 2
529#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
530
531/* png_time is a way to hold the time in an machine independent way.
532 * Two conversions are provided, both from time_t and struct tm. There
533 * is no portable way to convert to either of these structures, as far
534 * as I know. If you know of a portable way, send it to me. As a side
535 * note - PNG has always been Year 2000 compliant!
536 */
537typedef struct png_time_struct
538{
539 png_uint_16 year; /* full year, as in, 1995 */
540 png_byte month; /* month of year, 1 - 12 */
541 png_byte day; /* day of month, 1 - 31 */
542 png_byte hour; /* hour of day, 0 - 23 */
543 png_byte minute; /* minute of hour, 0 - 59 */
544 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
545} png_time;
546typedef png_time FAR * png_timep;
547typedef png_time FAR * FAR * png_timepp;
548
549#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
550 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
551/* png_unknown_chunk is a structure to hold queued chunks for which there is
552 * no specific support. The idea is that we can use this to queue
553 * up private chunks for output even though the library doesn't actually
554 * know about their semantics.
555 */
556#define PNG_CHUNK_NAME_LENGTH 5
557typedef struct png_unknown_chunk_t
558{
559 png_byte name[PNG_CHUNK_NAME_LENGTH];
560 png_byte *data;
561 png_size_t size;
562
563 /* libpng-using applications should NOT directly modify this byte. */
564 png_byte location; /* mode of operation at read time */
565}
566png_unknown_chunk;
567typedef png_unknown_chunk FAR * png_unknown_chunkp;
568typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
569#endif
570
571/* png_info is a structure that holds the information in a PNG file so
572 * that the application can find out the characteristics of the image.
573 * If you are reading the file, this structure will tell you what is
574 * in the PNG file. If you are writing the file, fill in the information
575 * you want to put into the PNG file, then call png_write_info().
576 * The names chosen should be very close to the PNG specification, so
577 * consult that document for information about the meaning of each field.
578 *
579 * With libpng < 0.95, it was only possible to directly set and read the
580 * the values in the png_info_struct, which meant that the contents and
581 * order of the values had to remain fixed. With libpng 0.95 and later,
582 * however, there are now functions that abstract the contents of
583 * png_info_struct from the application, so this makes it easier to use
584 * libpng with dynamic libraries, and even makes it possible to use
585 * libraries that don't have all of the libpng ancillary chunk-handing
586 * functionality.
587 *
588 * In any case, the order of the parameters in png_info_struct should NOT
589 * be changed for as long as possible to keep compatibility with applications
590 * that use the old direct-access method with png_info_struct.
591 *
592 * The following members may have allocated storage attached that should be
593 * cleaned up before the structure is discarded: palette, trans, text,
594 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
595 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
596 * are automatically freed when the info structure is deallocated, if they were
597 * allocated internally by libpng. This behavior can be changed by means
598 * of the png_data_freer() function.
599 *
600 * More allocation details: all the chunk-reading functions that
601 * change these members go through the corresponding png_set_*
602 * functions. A function to clear these members is available: see
603 * png_free_data(). The png_set_* functions do not depend on being
604 * able to point info structure members to any of the storage they are
605 * passed (they make their own copies), EXCEPT that the png_set_text
606 * functions use the same storage passed to them in the text_ptr or
607 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
608 * functions do not make their own copies.
609 */
610typedef struct png_info_struct
611{
612 /* The following are necessary for every PNG file */
613 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */
614 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
615 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */
616 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */
617 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */
618 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */
619 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */
620 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
621 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */
622 /* The following three should have been named *_method not *_type */
623 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
624 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
625 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
626
627 /* The following is informational only on read, and not used on writes. */
628 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */
629 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
630 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */
631 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */
632
633 /* The rest of the data is optional. If you are reading, check the
634 * valid field to see if the information in these are valid. If you
635 * are writing, set the valid field to those chunks you want written,
636 * and initialize the appropriate fields below.
637 */
638
639#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
640 /* The gAMA chunk describes the gamma characteristics of the system
641 * on which the image was created, normally in the range [1.0, 2.5].
642 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
643 */
644 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
645#endif
646
647#ifdef PNG_sRGB_SUPPORTED
648 /* GR-P, 0.96a */
649 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
650 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */
651#endif
652
653#ifdef PNG_TEXT_SUPPORTED
654 /* The tEXt, and zTXt chunks contain human-readable textual data in
655 * uncompressed, compressed, and optionally compressed forms, respectively.
656 * The data in "text" is an array of pointers to uncompressed,
657 * null-terminated C strings. Each chunk has a keyword that describes the
658 * textual data contained in that chunk. Keywords are not required to be
659 * unique, and the text string may be empty. Any number of text chunks may
660 * be in an image.
661 */
662 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
663 int max_text PNG_DEPSTRUCT; /* current size of text array */
664 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
665#endif /* PNG_TEXT_SUPPORTED */
666
667#ifdef PNG_tIME_SUPPORTED
668 /* The tIME chunk holds the last time the displayed image data was
669 * modified. See the png_time struct for the contents of this struct.
670 */
671 png_time mod_time PNG_DEPSTRUCT;
672#endif
673
674#ifdef PNG_sBIT_SUPPORTED
675 /* The sBIT chunk specifies the number of significant high-order bits
676 * in the pixel data. Values are in the range [1, bit_depth], and are
677 * only specified for the channels in the pixel data. The contents of
678 * the low-order bits is not specified. Data is valid if
679 * (valid & PNG_INFO_sBIT) is non-zero.
680 */
681 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
682#endif
683
684#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
685defined(PNG_READ_BACKGROUND_SUPPORTED)
686 /* The tRNS chunk supplies transparency data for paletted images and
687 * other image types that don't need a full alpha channel. There are
688 * "num_trans" transparency values for a paletted image, stored in the
689 * same order as the palette colors, starting from index 0. Values
690 * for the data are in the range [0, 255], ranging from fully transparent
691 * to fully opaque, respectively. For non-paletted images, there is a
692 * single color specified that should be treated as fully transparent.
693 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
694 */
695 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */
696 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */
697#endif
698
699#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
700 /* The bKGD chunk gives the suggested image background color if the
701 * display program does not have its own background color and the image
702 * is needs to composited onto a background before display. The colors
703 * in "background" are normally in the same color space/depth as the
704 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
705 */
706 png_color_16 background PNG_DEPSTRUCT;
707#endif
708
709#ifdef PNG_oFFs_SUPPORTED
710 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
711 * and downwards from the top-left corner of the display, page, or other
712 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
713 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
714 */
715 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
716 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
717 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
718#endif
719
720#ifdef PNG_pHYs_SUPPORTED
721 /* The pHYs chunk gives the physical pixel density of the image for
722 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
723 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
724 */
725 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
726 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
727 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */
728#endif
729
730#ifdef PNG_hIST_SUPPORTED
731 /* The hIST chunk contains the relative frequency or importance of the
732 * various palette entries, so that a viewer can intelligently select a
733 * reduced-color palette, if required. Data is an array of "num_palette"
734 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
735 * is non-zero.
736 */
737 png_uint_16p hist PNG_DEPSTRUCT;
738#endif
739
740#ifdef PNG_cHRM_SUPPORTED
741 /* The cHRM chunk describes the CIE color characteristics of the monitor
742 * on which the PNG was created. This data allows the viewer to do gamut
743 * mapping of the input image to ensure that the viewer sees the same
744 * colors in the image as the creator. Values are in the range
745 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
746 */
747#ifdef PNG_FLOATING_POINT_SUPPORTED
748 float x_white PNG_DEPSTRUCT;
749 float y_white PNG_DEPSTRUCT;
750 float x_red PNG_DEPSTRUCT;
751 float y_red PNG_DEPSTRUCT;
752 float x_green PNG_DEPSTRUCT;
753 float y_green PNG_DEPSTRUCT;
754 float x_blue PNG_DEPSTRUCT;
755 float y_blue PNG_DEPSTRUCT;
756#endif
757#endif
758
759#ifdef PNG_pCAL_SUPPORTED
760 /* The pCAL chunk describes a transformation between the stored pixel
761 * values and original physical data values used to create the image.
762 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
763 * range given by [pcal_X0, pcal_X1], and are further transformed by a
764 * (possibly non-linear) transformation function given by "pcal_type"
765 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
766 * defines below, and the PNG-Group's PNG extensions document for a
767 * complete description of the transformations and how they should be
768 * implemented, and for a description of the ASCII parameter strings.
769 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
770 */
771 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */
772 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */
773 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */
774 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */
775 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */
776 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */
777 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */
778#endif
779
780/* New members added in libpng-1.0.6 */
781#ifdef PNG_FREE_ME_SUPPORTED
782 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
783#endif
784
785#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
786 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
787 /* Storage for unknown chunks that the library doesn't recognize. */
788 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
789 png_size_t unknown_chunks_num PNG_DEPSTRUCT;
790#endif
791
792#ifdef PNG_iCCP_SUPPORTED
793 /* iCCP chunk data. */
794 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */
795 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */
796 /* Note to maintainer: should be png_bytep */
797 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */
798 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
799#endif
800
801#ifdef PNG_sPLT_SUPPORTED
802 /* Data on sPLT chunks (there may be more than one). */
803 png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
804 png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
805#endif
806
807#ifdef PNG_sCAL_SUPPORTED
808 /* The sCAL chunk describes the actual physical dimensions of the
809 * subject matter of the graphic. The chunk contains a unit specification
810 * a byte value, and two ASCII strings representing floating-point
811 * values. The values are width and height corresponsing to one pixel
812 * in the image. This external representation is converted to double
813 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
814 */
815 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */
816#ifdef PNG_FLOATING_POINT_SUPPORTED
817 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */
818 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */
819#endif
820#ifdef PNG_FIXED_POINT_SUPPORTED
821 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */
822 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */
823#endif
824#endif
825
826#ifdef PNG_INFO_IMAGE_SUPPORTED
827 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
828 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
829 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */
830#endif
831
832#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
833 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */
834#endif
835
836#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
837 png_fixed_point int_x_white PNG_DEPSTRUCT;
838 png_fixed_point int_y_white PNG_DEPSTRUCT;
839 png_fixed_point int_x_red PNG_DEPSTRUCT;
840 png_fixed_point int_y_red PNG_DEPSTRUCT;
841 png_fixed_point int_x_green PNG_DEPSTRUCT;
842 png_fixed_point int_y_green PNG_DEPSTRUCT;
843 png_fixed_point int_x_blue PNG_DEPSTRUCT;
844 png_fixed_point int_y_blue PNG_DEPSTRUCT;
845#endif
846
847} png_info;
848
849typedef png_info FAR * png_infop;
850typedef png_info FAR * FAR * png_infopp;
851
852/* Maximum positive integer used in PNG is (2^31)-1 */
853#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
854#define PNG_UINT_32_MAX ((png_uint_32)(-1))
855#define PNG_SIZE_MAX ((png_size_t)(-1))
856#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
857/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
858#define PNG_MAX_UINT PNG_UINT_31_MAX
859#endif
860
861/* These describe the color_type field in png_info. */
862/* color type masks */
863#define PNG_COLOR_MASK_PALETTE 1
864#define PNG_COLOR_MASK_COLOR 2
865#define PNG_COLOR_MASK_ALPHA 4
866
867/* color types. Note that not all combinations are legal */
868#define PNG_COLOR_TYPE_GRAY 0
869#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
870#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
871#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
872#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
873/* aliases */
874#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
875#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
876
877/* This is for compression type. PNG 1.0-1.2 only define the single type. */
878#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
879#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
880
881/* This is for filter type. PNG 1.0-1.2 only define the single type. */
882#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
883#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
884#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
885
886/* These are for the interlacing type. These values should NOT be changed. */
887#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
888#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
889#define PNG_INTERLACE_LAST 2 /* Not a valid value */
890
891/* These are for the oFFs chunk. These values should NOT be changed. */
892#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
893#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
894#define PNG_OFFSET_LAST 2 /* Not a valid value */
895
896/* These are for the pCAL chunk. These values should NOT be changed. */
897#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
898#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
899#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
900#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
901#define PNG_EQUATION_LAST 4 /* Not a valid value */
902
903/* These are for the sCAL chunk. These values should NOT be changed. */
904#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
905#define PNG_SCALE_METER 1 /* meters per pixel */
906#define PNG_SCALE_RADIAN 2 /* radians per pixel */
907#define PNG_SCALE_LAST 3 /* Not a valid value */
908
909/* These are for the pHYs chunk. These values should NOT be changed. */
910#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
911#define PNG_RESOLUTION_METER 1 /* pixels/meter */
912#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
913
914/* These are for the sRGB chunk. These values should NOT be changed. */
915#define PNG_sRGB_INTENT_PERCEPTUAL 0
916#define PNG_sRGB_INTENT_RELATIVE 1
917#define PNG_sRGB_INTENT_SATURATION 2
918#define PNG_sRGB_INTENT_ABSOLUTE 3
919#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
920
921/* This is for text chunks */
922#define PNG_KEYWORD_MAX_LENGTH 79
923
924/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
925#define PNG_MAX_PALETTE_LENGTH 256
926
927/* These determine if an ancillary chunk's data has been successfully read
928 * from the PNG header, or if the application has filled in the corresponding
929 * data in the info_struct to be written into the output file. The values
930 * of the PNG_INFO_<chunk> defines should NOT be changed.
931 */
932#define PNG_INFO_gAMA 0x0001
933#define PNG_INFO_sBIT 0x0002
934#define PNG_INFO_cHRM 0x0004
935#define PNG_INFO_PLTE 0x0008
936#define PNG_INFO_tRNS 0x0010
937#define PNG_INFO_bKGD 0x0020
938#define PNG_INFO_hIST 0x0040
939#define PNG_INFO_pHYs 0x0080
940#define PNG_INFO_oFFs 0x0100
941#define PNG_INFO_tIME 0x0200
942#define PNG_INFO_pCAL 0x0400
943#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
944#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
945#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
946#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
947#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
948
949/* This is used for the transformation routines, as some of them
950 * change these values for the row. It also should enable using
951 * the routines for other purposes.
952 */
953typedef struct png_row_info_struct
954{
955 png_uint_32 width; /* width of row */
956 png_uint_32 rowbytes; /* number of bytes in row */
957 png_byte color_type; /* color type of row */
958 png_byte bit_depth; /* bit depth of row */
959 png_byte channels; /* number of channels (1, 2, 3, or 4) */
960 png_byte pixel_depth; /* bits per pixel (depth * channels) */
961} png_row_info;
962
963typedef png_row_info FAR * png_row_infop;
964typedef png_row_info FAR * FAR * png_row_infopp;
965
966/* These are the function types for the I/O functions and for the functions
967 * that allow the user to override the default I/O functions with his or her
968 * own. The png_error_ptr type should match that of user-supplied warning
969 * and error functions, while the png_rw_ptr type should match that of the
970 * user read/write data functions.
971 */
972typedef struct png_struct_def png_struct;
973typedef png_struct FAR * png_structp;
974
975typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
976typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
977typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
978typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
979 int));
980typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
981 int));
982
983#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
984typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
985typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
986typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
987 png_uint_32, int));
988#endif
989
990#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
991 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
992 defined(PNG_LEGACY_SUPPORTED)
993typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
994 png_row_infop, png_bytep));
995#endif
996
997#ifdef PNG_USER_CHUNKS_SUPPORTED
998typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
999#endif
1000#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1001typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1002#endif
1003
1004/* Transform masks for the high-level interface */
1005#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1006#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1007#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1008#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1009#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1010#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1011#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1012#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1013#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1014#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1015#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1016#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1017#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */
1018/* Added to libpng-1.2.34 */
1019#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */
1020#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
1021/* Added to libpng-1.2.41 */
1022#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
1023
1024/* Flags for MNG supported features */
1025#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1026#define PNG_FLAG_MNG_FILTER_64 0x04
1027#define PNG_ALL_MNG_FEATURES 0x05
1028
1029typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1030typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1031
1032/* The structure that holds the information to read and write PNG files.
1033 * The only people who need to care about what is inside of this are the
1034 * people who will be modifying the library for their own special needs.
1035 * It should NOT be accessed directly by an application, except to store
1036 * the jmp_buf.
1037 */
1038
1039struct png_struct_def
1040{
1041#ifdef PNG_SETJMP_SUPPORTED
1042 jmp_buf jmpbuf; /* used in png_error */
1043#endif
1044 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */
1045 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */
1046 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */
1047 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */
1048 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */
1049 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */
1050
1051#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1052 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */
1053#endif
1054
1055#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1056 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */
1057#endif
1058
1059/* These were added in libpng-1.0.2 */
1060#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
1061#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1062 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1063 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */
1064 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */
1065 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */
1066#endif
1067#endif
1068
1069 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */
1070 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */
1071 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */
1072
1073 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */
1074 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */
1075 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */
1076 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */
1077 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */
1078 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */
1079 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */
1080 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */
1081
1082 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */
1083 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */
1084 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */
1085 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */
1086 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */
1087#if 0 /* Replaced with the following in libpng-1.2.43 */
1088 png_size_t irowbytes PNG_DEPSTRUCT;
1089#endif
1090/* Added in libpng-1.2.43 */
1091#ifdef PNG_USER_LIMITS_SUPPORTED
1092 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
1093 * chunks that can be stored (0 means unlimited).
1094 */
1095 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
1096#endif
1097 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */
1098 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */
1099 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */
1100 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
1101#ifndef PNG_NO_WRITE_FILTER
1102 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */
1103 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */
1104 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */
1105 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */
1106#endif
1107 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */
1108
1109 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */
1110 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */
1111 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */
1112 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */
1113 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */
1114 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */
1115 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */
1116 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */
1117 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1118 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */
1119 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */
1120 png_byte color_type PNG_DEPSTRUCT; /* color type of file */
1121 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */
1122 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */
1123 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
1124 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */
1125 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */
1126 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */
1127
1128#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1129#ifdef PNG_LEGACY_SUPPORTED
1130 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */
1131#else
1132 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */
1133#endif
1134#endif
1135
1136#ifdef PNG_bKGD_SUPPORTED
1137 png_byte background_gamma_type PNG_DEPSTRUCT;
1138# ifdef PNG_FLOATING_POINT_SUPPORTED
1139 float background_gamma PNG_DEPSTRUCT;
1140# endif
1141 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */
1142#ifdef PNG_READ_GAMMA_SUPPORTED
1143 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */
1144#endif
1145#endif /* PNG_bKGD_SUPPORTED */
1146
1147#ifdef PNG_WRITE_FLUSH_SUPPORTED
1148 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */
1149 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */
1150 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */
1151#endif
1152
1153#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1154 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */
1155#ifdef PNG_FLOATING_POINT_SUPPORTED
1156 float gamma PNG_DEPSTRUCT; /* file gamma value */
1157 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */
1158#endif
1159#endif
1160
1161#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1162 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */
1163 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
1164 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1165 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */
1166 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
1167 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1168#endif
1169
1170#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1171 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */
1172#endif
1173
1174#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1175 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */
1176#endif
1177
1178#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1179 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1180 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */
1181 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */
1182#endif
1183
1184 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */
1185 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */
1186#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1187 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */
1188 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */
1189 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */
1190 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */
1191 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */
1192 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */
1193 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */
1194 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */
1195 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */
1196 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */
1197 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */
1198 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */
1199 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */
1200 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */
1201 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */
1202
1203# ifdef PNG_TEXT_SUPPORTED
1204 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */
1205 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */
1206 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */
1207 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */
1208# endif /* PNG_TEXT_SUPPORTED */
1209#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1210
1211#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1212/* for the Borland special 64K segment handler */
1213 png_bytepp offset_table_ptr PNG_DEPSTRUCT;
1214 png_bytep offset_table PNG_DEPSTRUCT;
1215 png_uint_16 offset_table_number PNG_DEPSTRUCT;
1216 png_uint_16 offset_table_count PNG_DEPSTRUCT;
1217 png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
1218#endif
1219
1220#ifdef PNG_READ_DITHER_SUPPORTED
1221 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */
1222 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */
1223#endif
1224
1225#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1226 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */
1227#endif
1228
1229#ifdef PNG_TIME_RFC1123_SUPPORTED
1230 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
1231#endif
1232
1233/* New members added in libpng-1.0.6 */
1234
1235#ifdef PNG_FREE_ME_SUPPORTED
1236 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
1237#endif
1238
1239#ifdef PNG_USER_CHUNKS_SUPPORTED
1240 png_voidp user_chunk_ptr PNG_DEPSTRUCT;
1241 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */
1242#endif
1243
1244#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1245 int num_chunk_list PNG_DEPSTRUCT;
1246 png_bytep chunk_list PNG_DEPSTRUCT;
1247#endif
1248
1249/* New members added in libpng-1.0.3 */
1250#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1251 png_byte rgb_to_gray_status PNG_DEPSTRUCT;
1252 /* These were changed from png_byte in libpng-1.0.6 */
1253 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
1254 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
1255 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
1256#endif
1257
1258/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1259#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1260 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1261 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1262/* Changed from png_byte to png_uint_32 at version 1.2.0 */
1263#ifdef PNG_1_0_X
1264 png_byte mng_features_permitted PNG_DEPSTRUCT;
1265#else
1266 png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
1267#endif /* PNG_1_0_X */
1268#endif
1269
1270/* New member added in libpng-1.0.7 */
1271#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1272 png_fixed_point int_gamma PNG_DEPSTRUCT;
1273#endif
1274
1275/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1276#ifdef PNG_MNG_FEATURES_SUPPORTED
1277 png_byte filter_type PNG_DEPSTRUCT;
1278#endif
1279
1280#ifdef PNG_1_0_X
1281/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1282 png_uint_32 row_buf_size PNG_DEPSTRUCT;
1283#endif
1284
1285/* New members added in libpng-1.2.0 */
1286#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1287# ifndef PNG_1_0_X
1288# ifdef PNG_MMX_CODE_SUPPORTED
1289 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT;
1290 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT;
1291# endif
1292 png_uint_32 asm_flags PNG_DEPSTRUCT;
1293# endif
1294#endif
1295
1296/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1297#ifdef PNG_USER_MEM_SUPPORTED
1298 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */
1299 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */
1300 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */
1301#endif
1302
1303/* New member added in libpng-1.0.13 and 1.2.0 */
1304 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
1305
1306#ifdef PNG_READ_DITHER_SUPPORTED
1307/* The following three members were added at version 1.0.14 and 1.2.4 */
1308 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */
1309 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */
1310 /* in the palette */
1311 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */
1312 /* palette color */
1313#endif
1314
1315/* New members added in libpng-1.0.16 and 1.2.6 */
1316 png_byte compression_type PNG_DEPSTRUCT;
1317
1318#ifdef PNG_USER_LIMITS_SUPPORTED
1319 png_uint_32 user_width_max PNG_DEPSTRUCT;
1320 png_uint_32 user_height_max PNG_DEPSTRUCT;
1321#endif
1322
1323/* New member added in libpng-1.0.25 and 1.2.17 */
1324#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1325 /* Storage for unknown chunk that the library doesn't recognize. */
1326 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
1327#endif
1328
1329/* New members added in libpng-1.2.26 */
1330 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
1331 png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
1332
1333/* New member added in libpng-1.2.30 */
1334 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */
1335
1336
1337};
1338
1339
1340/* This triggers a compiler error in png.c, if png.c and png.h
1341 * do not agree upon the version number.
1342 */
1343typedef png_structp version_1_2_54;
1344
1345typedef png_struct FAR * FAR * png_structpp;
1346
1347/* Here are the function definitions most commonly used. This is not
1348 * the place to find out how to use libpng. See libpng.txt for the
1349 * full explanation, see example.c for the summary. This just provides
1350 * a simple one line description of the use of each function.
1351 */
1352
1353/* Returns the version number of the library */
1354extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1355
1356/* Tell lib we have already handled the first <num_bytes> magic bytes.
1357 * Handling more than 8 bytes from the beginning of the file is an error.
1358 */
1359extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1360 int num_bytes));
1361
1362/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1363 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1364 * signature, and non-zero otherwise. Having num_to_check == 0 or
1365 * start > 7 will always fail (ie return non-zero).
1366 */
1367extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1368 png_size_t num_to_check));
1369
1370/* Simple signature checking function. This is the same as calling
1371 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1372 */
1373extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED;
1374
1375/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1376extern PNG_EXPORT(png_structp,png_create_read_struct)
1377 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1378 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1379
1380/* Allocate and initialize png_ptr struct for writing, and any other memory */
1381extern PNG_EXPORT(png_structp,png_create_write_struct)
1382 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1383 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1384
1385#ifdef PNG_WRITE_SUPPORTED
1386extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1387 PNGARG((png_structp png_ptr));
1388#endif
1389
1390#ifdef PNG_WRITE_SUPPORTED
1391extern PNG_EXPORT(void,png_set_compression_buffer_size)
1392 PNGARG((png_structp png_ptr, png_uint_32 size));
1393#endif
1394
1395/* Reset the compression stream */
1396extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1397
1398/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1399#ifdef PNG_USER_MEM_SUPPORTED
1400extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1401 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1402 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1403 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1404extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1405 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1406 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1407 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1408#endif
1409
1410/* Write a PNG chunk - size, type, (optional) data, CRC. */
1411extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1412 png_bytep chunk_name, png_bytep data, png_size_t length));
1413
1414/* Write the start of a PNG chunk - length and chunk name. */
1415extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1416 png_bytep chunk_name, png_uint_32 length));
1417
1418/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1419extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1420 png_bytep data, png_size_t length));
1421
1422/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1423extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1424
1425/* Allocate and initialize the info structure */
1426extern PNG_EXPORT(png_infop,png_create_info_struct)
1427 PNGARG((png_structp png_ptr)) PNG_ALLOCATED;
1428
1429#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1430/* Initialize the info structure (old interface - DEPRECATED) */
1431extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr))
1432 PNG_DEPRECATED;
1433#undef png_info_init
1434#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1435 png_sizeof(png_info));
1436#endif
1437
1438extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1439 png_size_t png_info_struct_size));
1440
1441/* Writes all the PNG information before the image. */
1442extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1443 png_infop info_ptr));
1444extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1445 png_infop info_ptr));
1446
1447#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1448/* Read the information before the actual image data. */
1449extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1450 png_infop info_ptr));
1451#endif
1452
1453#ifdef PNG_TIME_RFC1123_SUPPORTED
1454extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1455 PNGARG((png_structp png_ptr, png_timep ptime));
1456#endif
1457
1458#ifdef PNG_CONVERT_tIME_SUPPORTED
1459/* Convert from a struct tm to png_time */
1460extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1461 struct tm FAR * ttime));
1462
1463/* Convert from time_t to png_time. Uses gmtime() */
1464extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1465 time_t ttime));
1466#endif /* PNG_CONVERT_tIME_SUPPORTED */
1467
1468#ifdef PNG_READ_EXPAND_SUPPORTED
1469/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1470extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1471#ifndef PNG_1_0_X
1472extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1473 png_ptr));
1474#endif
1475extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1476extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1477#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1478/* Deprecated */
1479extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp
1480 png_ptr)) PNG_DEPRECATED;
1481#endif
1482#endif
1483
1484#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1485/* Use blue, green, red order for pixels. */
1486extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1487#endif
1488
1489#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1490/* Expand the grayscale to 24-bit RGB if necessary. */
1491extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1492#endif
1493
1494#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1495/* Reduce RGB to grayscale. */
1496#ifdef PNG_FLOATING_POINT_SUPPORTED
1497extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1498 int error_action, double red, double green ));
1499#endif
1500extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1501 int error_action, png_fixed_point red, png_fixed_point green ));
1502extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1503 png_ptr));
1504#endif
1505
1506extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1507 png_colorp palette));
1508
1509#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
1510extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1511#endif
1512
1513#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1514 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1515extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1516#endif
1517
1518#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1519 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1520extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1521#endif
1522
1523#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1524/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1525extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1526 png_uint_32 filler, int flags));
1527/* The values of the PNG_FILLER_ defines should NOT be changed */
1528#define PNG_FILLER_BEFORE 0
1529#define PNG_FILLER_AFTER 1
1530/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1531#ifndef PNG_1_0_X
1532extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1533 png_uint_32 filler, int flags));
1534#endif
1535#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1536
1537#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1538/* Swap bytes in 16-bit depth files. */
1539extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1540#endif
1541
1542#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1543/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1544extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1545#endif
1546
1547#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1548/* Swap packing order of pixels in bytes. */
1549extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1550#endif
1551
1552#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1553/* Converts files to legal bit depths. */
1554extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1555 png_color_8p true_bits));
1556#endif
1557
1558#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1559 defined(PNG_WRITE_INTERLACING_SUPPORTED)
1560/* Have the code handle the interlacing. Returns the number of passes. */
1561extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1562#endif
1563
1564#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1565/* Invert monochrome files */
1566extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1567#endif
1568
1569#ifdef PNG_READ_BACKGROUND_SUPPORTED
1570/* Handle alpha and tRNS by replacing with a background color. */
1571#ifdef PNG_FLOATING_POINT_SUPPORTED
1572extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1573 png_color_16p background_color, int background_gamma_code,
1574 int need_expand, double background_gamma));
1575#endif
1576#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1577#define PNG_BACKGROUND_GAMMA_SCREEN 1
1578#define PNG_BACKGROUND_GAMMA_FILE 2
1579#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1580#endif
1581
1582#ifdef PNG_READ_16_TO_8_SUPPORTED
1583/* Strip the second byte of information from a 16-bit depth file. */
1584extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1585#endif
1586
1587#ifdef PNG_READ_DITHER_SUPPORTED
1588/* Turn on dithering, and reduce the palette to the number of colors available. */
1589extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1590 png_colorp palette, int num_palette, int maximum_colors,
1591 png_uint_16p histogram, int full_dither));
1592#endif
1593
1594#ifdef PNG_READ_GAMMA_SUPPORTED
1595/* Handle gamma correction. Screen_gamma=(display_exponent) */
1596#ifdef PNG_FLOATING_POINT_SUPPORTED
1597extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1598 double screen_gamma, double default_file_gamma));
1599#endif
1600#endif
1601
1602#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1603#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1604 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1605/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1606/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1607extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1608 int empty_plte_permitted)) PNG_DEPRECATED;
1609#endif
1610#endif
1611
1612#ifdef PNG_WRITE_FLUSH_SUPPORTED
1613/* Set how many lines between output flushes - 0 for no flushing */
1614extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1615/* Flush the current PNG output buffer */
1616extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1617#endif
1618
1619/* Optional update palette with requested transformations */
1620extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1621
1622/* Optional call to update the users info structure */
1623extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1624 png_infop info_ptr));
1625
1626#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1627/* Read one or more rows of image data. */
1628extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1629 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1630#endif
1631
1632#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1633/* Read a row of data. */
1634extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1635 png_bytep row,
1636 png_bytep display_row));
1637#endif
1638
1639#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1640/* Read the whole image into memory at once. */
1641extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1642 png_bytepp image));
1643#endif
1644
1645/* Write a row of image data */
1646extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1647 png_bytep row));
1648
1649/* Write a few rows of image data */
1650extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1651 png_bytepp row, png_uint_32 num_rows));
1652
1653/* Write the image data */
1654extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1655 png_bytepp image));
1656
1657/* Writes the end of the PNG file. */
1658extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1659 png_infop info_ptr));
1660
1661#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1662/* Read the end of the PNG file. */
1663extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1664 png_infop info_ptr));
1665#endif
1666
1667/* Free any memory associated with the png_info_struct */
1668extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1669 png_infopp info_ptr_ptr));
1670
1671/* Free any memory associated with the png_struct and the png_info_structs */
1672extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1673 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1674
1675/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
1676extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1677 png_infop end_info_ptr)) PNG_DEPRECATED;
1678
1679/* Free any memory associated with the png_struct and the png_info_structs */
1680extern PNG_EXPORT(void,png_destroy_write_struct)
1681 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1682
1683/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1684extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED;
1685
1686/* Set the libpng method of handling chunk CRC errors */
1687extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1688 int crit_action, int ancil_action));
1689
1690/* Values for png_set_crc_action() to say how to handle CRC errors in
1691 * ancillary and critical chunks, and whether to use the data contained
1692 * therein. Note that it is impossible to "discard" data in a critical
1693 * chunk. For versions prior to 0.90, the action was always error/quit,
1694 * whereas in version 0.90 and later, the action for CRC errors in ancillary
1695 * chunks is warn/discard. These values should NOT be changed.
1696 *
1697 * value action:critical action:ancillary
1698 */
1699#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1700#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1701#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1702#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1703#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1704#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1705
1706/* These functions give the user control over the scan-line filtering in
1707 * libpng and the compression methods used by zlib. These functions are
1708 * mainly useful for testing, as the defaults should work with most users.
1709 * Those users who are tight on memory or want faster performance at the
1710 * expense of compression can modify them. See the compression library
1711 * header file (zlib.h) for an explination of the compression functions.
1712 */
1713
1714/* Set the filtering method(s) used by libpng. Currently, the only valid
1715 * value for "method" is 0.
1716 */
1717extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1718 int filters));
1719
1720/* Flags for png_set_filter() to say which filters to use. The flags
1721 * are chosen so that they don't conflict with real filter types
1722 * below, in case they are supplied instead of the #defined constants.
1723 * These values should NOT be changed.
1724 */
1725#define PNG_NO_FILTERS 0x00
1726#define PNG_FILTER_NONE 0x08
1727#define PNG_FILTER_SUB 0x10
1728#define PNG_FILTER_UP 0x20
1729#define PNG_FILTER_AVG 0x40
1730#define PNG_FILTER_PAETH 0x80
1731#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1732 PNG_FILTER_AVG | PNG_FILTER_PAETH)
1733
1734/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1735 * These defines should NOT be changed.
1736 */
1737#define PNG_FILTER_VALUE_NONE 0
1738#define PNG_FILTER_VALUE_SUB 1
1739#define PNG_FILTER_VALUE_UP 2
1740#define PNG_FILTER_VALUE_AVG 3
1741#define PNG_FILTER_VALUE_PAETH 4
1742#define PNG_FILTER_VALUE_LAST 5
1743
1744#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* DEPRECATED */
1745#ifdef PNG_FLOATING_POINT_SUPPORTED
1746extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1747 int heuristic_method, int num_weights, png_doublep filter_weights,
1748 png_doublep filter_costs));
1749#endif
1750#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1751
1752/* The following are no longer used and will be removed from libpng-1.7: */
1753#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1754#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1755#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1756#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1757
1758/* Set the library compression level. Currently, valid values range from
1759 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1760 * (0 - no compression, 9 - "maximal" compression). Note that tests have
1761 * shown that zlib compression levels 3-6 usually perform as well as level 9
1762 * for PNG images, and do considerably fewer caclulations. In the future,
1763 * these values may not correspond directly to the zlib compression levels.
1764 */
1765extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1766 int level));
1767
1768extern PNG_EXPORT(void,png_set_compression_mem_level)
1769 PNGARG((png_structp png_ptr, int mem_level));
1770
1771extern PNG_EXPORT(void,png_set_compression_strategy)
1772 PNGARG((png_structp png_ptr, int strategy));
1773
1774extern PNG_EXPORT(void,png_set_compression_window_bits)
1775 PNGARG((png_structp png_ptr, int window_bits));
1776
1777extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1778 int method));
1779
1780/* These next functions are called for input/output, memory, and error
1781 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1782 * and call standard C I/O routines such as fread(), fwrite(), and
1783 * fprintf(). These functions can be made to use other I/O routines
1784 * at run time for those applications that need to handle I/O in a
1785 * different manner by calling png_set_???_fn(). See libpng.txt for
1786 * more information.
1787 */
1788
1789#ifdef PNG_STDIO_SUPPORTED
1790/* Initialize the input/output for the PNG file to the default functions. */
1791extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1792#endif
1793
1794/* Replace the (error and abort), and warning functions with user
1795 * supplied functions. If no messages are to be printed you must still
1796 * write and use replacement functions. The replacement error_fn should
1797 * still do a longjmp to the last setjmp location if you are using this
1798 * method of error handling. If error_fn or warning_fn is NULL, the
1799 * default function will be used.
1800 */
1801
1802extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1803 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1804
1805/* Return the user pointer associated with the error functions */
1806extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1807
1808/* Replace the default data output functions with a user supplied one(s).
1809 * If buffered output is not used, then output_flush_fn can be set to NULL.
1810 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1811 * output_flush_fn will be ignored (and thus can be NULL).
1812 * It is probably a mistake to use NULL for output_flush_fn if
1813 * write_data_fn is not also NULL unless you have built libpng with
1814 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
1815 * default flush function, which uses the standard *FILE structure, will
1816 * be used.
1817 */
1818extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1819 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1820
1821/* Replace the default data input function with a user supplied one. */
1822extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1823 png_voidp io_ptr, png_rw_ptr read_data_fn));
1824
1825/* Return the user pointer associated with the I/O functions */
1826extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1827
1828extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1829 png_read_status_ptr read_row_fn));
1830
1831extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1832 png_write_status_ptr write_row_fn));
1833
1834#ifdef PNG_USER_MEM_SUPPORTED
1835/* Replace the default memory allocation functions with user supplied one(s). */
1836extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1837 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1838/* Return the user pointer associated with the memory functions */
1839extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
1840#endif
1841
1842#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1843 defined(PNG_LEGACY_SUPPORTED)
1844extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
1845 png_ptr, png_user_transform_ptr read_user_transform_fn));
1846#endif
1847
1848#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1849 defined(PNG_LEGACY_SUPPORTED)
1850extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
1851 png_ptr, png_user_transform_ptr write_user_transform_fn));
1852#endif
1853
1854#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1855 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1856 defined(PNG_LEGACY_SUPPORTED)
1857extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
1858 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
1859 int user_transform_channels));
1860/* Return the user pointer associated with the user transform functions */
1861extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
1862 PNGARG((png_structp png_ptr));
1863#endif
1864
1865#ifdef PNG_USER_CHUNKS_SUPPORTED
1866extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
1867 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
1868extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
1869 png_ptr));
1870#endif
1871
1872#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1873/* Sets the function callbacks for the push reader, and a pointer to a
1874 * user-defined structure available to the callback functions.
1875 */
1876extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
1877 png_voidp progressive_ptr,
1878 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1879 png_progressive_end_ptr end_fn));
1880
1881/* Returns the user pointer associated with the push read functions */
1882extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
1883 PNGARG((png_structp png_ptr));
1884
1885/* Function to be called when data becomes available */
1886extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
1887 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
1888
1889/* Function that combines rows. Not very much different than the
1890 * png_combine_row() call. Is this even used?????
1891 */
1892extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
1893 png_bytep old_row, png_bytep new_row));
1894#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1895
1896extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
1897 png_uint_32 size)) PNG_ALLOCATED;
1898
1899#ifdef PNG_1_0_X
1900# define png_malloc_warn png_malloc
1901#else
1902/* Added at libpng version 1.2.4 */
1903extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
1904 png_uint_32 size)) PNG_ALLOCATED;
1905#endif
1906
1907/* Frees a pointer allocated by png_malloc() */
1908extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
1909
1910#ifdef PNG_1_0_X
1911/* Function to allocate memory for zlib. */
1912extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
1913 uInt size));
1914
1915/* Function to free memory for zlib */
1916extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
1917#endif
1918
1919/* Free data that was allocated internally */
1920extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
1921 png_infop info_ptr, png_uint_32 free_me, int num));
1922#ifdef PNG_FREE_ME_SUPPORTED
1923/* Reassign responsibility for freeing existing data, whether allocated
1924 * by libpng or by the application
1925 */
1926extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
1927 png_infop info_ptr, int freer, png_uint_32 mask));
1928#endif
1929/* Assignments for png_data_freer */
1930#define PNG_DESTROY_WILL_FREE_DATA 1
1931#define PNG_SET_WILL_FREE_DATA 1
1932#define PNG_USER_WILL_FREE_DATA 2
1933/* Flags for png_ptr->free_me and info_ptr->free_me */
1934#define PNG_FREE_HIST 0x0008
1935#define PNG_FREE_ICCP 0x0010
1936#define PNG_FREE_SPLT 0x0020
1937#define PNG_FREE_ROWS 0x0040
1938#define PNG_FREE_PCAL 0x0080
1939#define PNG_FREE_SCAL 0x0100
1940#define PNG_FREE_UNKN 0x0200
1941#define PNG_FREE_LIST 0x0400
1942#define PNG_FREE_PLTE 0x1000
1943#define PNG_FREE_TRNS 0x2000
1944#define PNG_FREE_TEXT 0x4000
1945#define PNG_FREE_ALL 0x7fff
1946#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
1947
1948#ifdef PNG_USER_MEM_SUPPORTED
1949extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
1950 png_uint_32 size)) PNG_ALLOCATED;
1951extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
1952 png_voidp ptr));
1953#endif
1954
1955extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
1956 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED;
1957
1958extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
1959 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED;
1960
1961#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
1962extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
1963 int check));
1964#endif /* USE_FAR_KEYWORD */
1965
1966#ifndef PNG_NO_ERROR_TEXT
1967/* Fatal error in PNG image of libpng - can't continue */
1968extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
1969 png_const_charp error_message)) PNG_NORETURN;
1970
1971/* The same, but the chunk name is prepended to the error string. */
1972extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
1973 png_const_charp error_message)) PNG_NORETURN;
1974#else
1975/* Fatal error in PNG image of libpng - can't continue */
1976extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
1977#endif
1978
1979#ifndef PNG_NO_WARNINGS
1980/* Non-fatal error in libpng. Can continue, but may have a problem. */
1981extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
1982 png_const_charp warning_message));
1983
1984#ifdef PNG_READ_SUPPORTED
1985/* Non-fatal error in libpng, chunk name is prepended to message. */
1986extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
1987 png_const_charp warning_message));
1988#endif /* PNG_READ_SUPPORTED */
1989#endif /* PNG_NO_WARNINGS */
1990
1991/* The png_set_<chunk> functions are for storing values in the png_info_struct.
1992 * Similarly, the png_get_<chunk> calls are used to read values from the
1993 * png_info_struct, either storing the parameters in the passed variables, or
1994 * setting pointers into the png_info_struct where the data is stored. The
1995 * png_get_<chunk> functions return a non-zero value if the data was available
1996 * in info_ptr, or return zero and do not change any of the parameters if the
1997 * data was not available.
1998 *
1999 * These functions should be used instead of directly accessing png_info
2000 * to avoid problems with future changes in the size and internal layout of
2001 * png_info_struct.
2002 */
2003/* Returns "flag" if chunk data is valid in info_ptr. */
2004extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2005png_infop info_ptr, png_uint_32 flag));
2006
2007/* Returns number of bytes needed to hold a transformed row. */
2008extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2009png_infop info_ptr));
2010
2011#ifdef PNG_INFO_IMAGE_SUPPORTED
2012/* Returns row_pointers, which is an array of pointers to scanlines that was
2013 * returned from png_read_png().
2014 */
2015extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2016png_infop info_ptr));
2017/* Set row_pointers, which is an array of pointers to scanlines for use
2018 * by png_write_png().
2019 */
2020extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2021 png_infop info_ptr, png_bytepp row_pointers));
2022#endif
2023
2024/* Returns number of color channels in image. */
2025extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2026png_infop info_ptr));
2027
2028#ifdef PNG_EASY_ACCESS_SUPPORTED
2029/* Returns image width in pixels. */
2030extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2031png_ptr, png_infop info_ptr));
2032
2033/* Returns image height in pixels. */
2034extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2035png_ptr, png_infop info_ptr));
2036
2037/* Returns image bit_depth. */
2038extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2039png_ptr, png_infop info_ptr));
2040
2041/* Returns image color_type. */
2042extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2043png_ptr, png_infop info_ptr));
2044
2045/* Returns image filter_type. */
2046extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2047png_ptr, png_infop info_ptr));
2048
2049/* Returns image interlace_type. */
2050extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2051png_ptr, png_infop info_ptr));
2052
2053/* Returns image compression_type. */
2054extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2055png_ptr, png_infop info_ptr));
2056
2057/* Returns image resolution in pixels per meter, from pHYs chunk data. */
2058extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2059png_ptr, png_infop info_ptr));
2060extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2061png_ptr, png_infop info_ptr));
2062extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2063png_ptr, png_infop info_ptr));
2064
2065/* Returns pixel aspect ratio, computed from pHYs chunk data. */
2066#ifdef PNG_FLOATING_POINT_SUPPORTED
2067extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2068png_ptr, png_infop info_ptr));
2069#endif
2070
2071/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2072extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2073png_ptr, png_infop info_ptr));
2074extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2075png_ptr, png_infop info_ptr));
2076extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2077png_ptr, png_infop info_ptr));
2078extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2079png_ptr, png_infop info_ptr));
2080
2081#endif /* PNG_EASY_ACCESS_SUPPORTED */
2082
2083/* Returns pointer to signature string read from PNG header */
2084extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2085png_infop info_ptr));
2086
2087#ifdef PNG_bKGD_SUPPORTED
2088extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2089 png_infop info_ptr, png_color_16p *background));
2090#endif
2091
2092#ifdef PNG_bKGD_SUPPORTED
2093extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2094 png_infop info_ptr, png_color_16p background));
2095#endif
2096
2097#ifdef PNG_cHRM_SUPPORTED
2098#ifdef PNG_FLOATING_POINT_SUPPORTED
2099extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2100 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2101 double *red_y, double *green_x, double *green_y, double *blue_x,
2102 double *blue_y));
2103#endif
2104#ifdef PNG_FIXED_POINT_SUPPORTED
2105extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2106 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2107 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2108 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2109 *int_blue_x, png_fixed_point *int_blue_y));
2110#endif
2111#endif
2112
2113#ifdef PNG_cHRM_SUPPORTED
2114#ifdef PNG_FLOATING_POINT_SUPPORTED
2115extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2116 png_infop info_ptr, double white_x, double white_y, double red_x,
2117 double red_y, double green_x, double green_y, double blue_x, double blue_y));
2118#endif
2119#ifdef PNG_FIXED_POINT_SUPPORTED
2120extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2121 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2122 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2123 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2124 png_fixed_point int_blue_y));
2125#endif
2126#endif
2127
2128#ifdef PNG_gAMA_SUPPORTED
2129#ifdef PNG_FLOATING_POINT_SUPPORTED
2130extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2131 png_infop info_ptr, double *file_gamma));
2132#endif
2133extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2134 png_infop info_ptr, png_fixed_point *int_file_gamma));
2135#endif
2136
2137#ifdef PNG_gAMA_SUPPORTED
2138#ifdef PNG_FLOATING_POINT_SUPPORTED
2139extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2140 png_infop info_ptr, double file_gamma));
2141#endif
2142extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2143 png_infop info_ptr, png_fixed_point int_file_gamma));
2144#endif
2145
2146#ifdef PNG_hIST_SUPPORTED
2147extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2148 png_infop info_ptr, png_uint_16p *hist));
2149#endif
2150
2151#ifdef PNG_hIST_SUPPORTED
2152extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2153 png_infop info_ptr, png_uint_16p hist));
2154#endif
2155
2156extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2157 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2158 int *bit_depth, int *color_type, int *interlace_method,
2159 int *compression_method, int *filter_method));
2160
2161extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2162 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2163 int color_type, int interlace_method, int compression_method,
2164 int filter_method));
2165
2166#ifdef PNG_oFFs_SUPPORTED
2167extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2168 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2169 int *unit_type));
2170#endif
2171
2172#ifdef PNG_oFFs_SUPPORTED
2173extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2174 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2175 int unit_type));
2176#endif
2177
2178#ifdef PNG_pCAL_SUPPORTED
2179extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2180 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2181 int *type, int *nparams, png_charp *units, png_charpp *params));
2182#endif
2183
2184#ifdef PNG_pCAL_SUPPORTED
2185extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2186 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2187 int type, int nparams, png_charp units, png_charpp params));
2188#endif
2189
2190#ifdef PNG_pHYs_SUPPORTED
2191extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2192 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2193#endif
2194
2195#ifdef PNG_pHYs_SUPPORTED
2196extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2197 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2198#endif
2199
2200extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2201 png_infop info_ptr, png_colorp *palette, int *num_palette));
2202
2203extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2204 png_infop info_ptr, png_colorp palette, int num_palette));
2205
2206#ifdef PNG_sBIT_SUPPORTED
2207extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2208 png_infop info_ptr, png_color_8p *sig_bit));
2209#endif
2210
2211#ifdef PNG_sBIT_SUPPORTED
2212extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2213 png_infop info_ptr, png_color_8p sig_bit));
2214#endif
2215
2216#ifdef PNG_sRGB_SUPPORTED
2217extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2218 png_infop info_ptr, int *intent));
2219#endif
2220
2221#ifdef PNG_sRGB_SUPPORTED
2222extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2223 png_infop info_ptr, int intent));
2224extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2225 png_infop info_ptr, int intent));
2226#endif
2227
2228#ifdef PNG_iCCP_SUPPORTED
2229extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2230 png_infop info_ptr, png_charpp name, int *compression_type,
2231 png_charpp profile, png_uint_32 *proflen));
2232 /* Note to maintainer: profile should be png_bytepp */
2233#endif
2234
2235#ifdef PNG_iCCP_SUPPORTED
2236extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2237 png_infop info_ptr, png_charp name, int compression_type,
2238 png_charp profile, png_uint_32 proflen));
2239 /* Note to maintainer: profile should be png_bytep */
2240#endif
2241
2242#ifdef PNG_sPLT_SUPPORTED
2243extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2244 png_infop info_ptr, png_sPLT_tpp entries));
2245#endif
2246
2247#ifdef PNG_sPLT_SUPPORTED
2248extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2249 png_infop info_ptr, png_sPLT_tp entries, int nentries));
2250#endif
2251
2252#ifdef PNG_TEXT_SUPPORTED
2253/* png_get_text also returns the number of text chunks in *num_text */
2254extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2255 png_infop info_ptr, png_textp *text_ptr, int *num_text));
2256#endif
2257
2258/*
2259 * Note while png_set_text() will accept a structure whose text,
2260 * language, and translated keywords are NULL pointers, the structure
2261 * returned by png_get_text will always contain regular
2262 * zero-terminated C strings. They might be empty strings but
2263 * they will never be NULL pointers.
2264 */
2265
2266#ifdef PNG_TEXT_SUPPORTED
2267extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2268 png_infop info_ptr, png_textp text_ptr, int num_text));
2269#endif
2270
2271#ifdef PNG_tIME_SUPPORTED
2272extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2273 png_infop info_ptr, png_timep *mod_time));
2274#endif
2275
2276#ifdef PNG_tIME_SUPPORTED
2277extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2278 png_infop info_ptr, png_timep mod_time));
2279#endif
2280
2281#ifdef PNG_tRNS_SUPPORTED
2282extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2283 png_infop info_ptr, png_bytep *trans, int *num_trans,
2284 png_color_16p *trans_values));
2285#endif
2286
2287#ifdef PNG_tRNS_SUPPORTED
2288extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2289 png_infop info_ptr, png_bytep trans, int num_trans,
2290 png_color_16p trans_values));
2291#endif
2292
2293#ifdef PNG_tRNS_SUPPORTED
2294#endif
2295
2296#ifdef PNG_sCAL_SUPPORTED
2297#ifdef PNG_FLOATING_POINT_SUPPORTED
2298extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2299 png_infop info_ptr, int *unit, double *width, double *height));
2300#else
2301#ifdef PNG_FIXED_POINT_SUPPORTED
2302extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2303 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2304#endif
2305#endif
2306#endif /* PNG_sCAL_SUPPORTED */
2307
2308#ifdef PNG_sCAL_SUPPORTED
2309#ifdef PNG_FLOATING_POINT_SUPPORTED
2310extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2311 png_infop info_ptr, int unit, double width, double height));
2312#else
2313#ifdef PNG_FIXED_POINT_SUPPORTED
2314extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2315 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2316#endif
2317#endif
2318#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2319
2320#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2321/* Provide a list of chunks and how they are to be handled, if the built-in
2322 handling or default unknown chunk handling is not desired. Any chunks not
2323 listed will be handled in the default manner. The IHDR and IEND chunks
2324 must not be listed.
2325 keep = 0: follow default behaviour
2326 = 1: do not keep
2327 = 2: keep only if safe-to-copy
2328 = 3: keep even if unsafe-to-copy
2329*/
2330extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2331 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2332PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2333 chunk_name));
2334#endif
2335#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
2336extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2337 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2338extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2339 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2340extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2341 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2342#endif
2343
2344/* Png_free_data() will turn off the "valid" flag for anything it frees.
2345 * If you need to turn it off for a chunk that your application has freed,
2346 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
2347 */
2348extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2349 png_infop info_ptr, int mask));
2350
2351#ifdef PNG_INFO_IMAGE_SUPPORTED
2352/* The "params" pointer is currently not used and is for future expansion. */
2353extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2354 png_infop info_ptr,
2355 int transforms,
2356 png_voidp params));
2357extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2358 png_infop info_ptr,
2359 int transforms,
2360 png_voidp params));
2361#endif
2362
2363/* Define PNG_DEBUG at compile time for debugging information. Higher
2364 * numbers for PNG_DEBUG mean more debugging information. This has
2365 * only been added since version 0.95 so it is not implemented throughout
2366 * libpng yet, but more support will be added as needed.
2367 */
2368#ifdef PNG_DEBUG
2369#if (PNG_DEBUG > 0)
2370#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2371#include <crtdbg.h>
2372#if (PNG_DEBUG > 1)
2373#ifndef _DEBUG
2374# define _DEBUG
2375#endif
2376#ifndef png_debug
2377#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
2378#endif
2379#ifndef png_debug1
2380#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
2381#endif
2382#ifndef png_debug2
2383#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
2384#endif
2385#endif
2386#else /* PNG_DEBUG_FILE || !_MSC_VER */
2387#ifndef PNG_DEBUG_FILE
2388#define PNG_DEBUG_FILE stderr
2389#endif /* PNG_DEBUG_FILE */
2390
2391#if (PNG_DEBUG > 1)
2392/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
2393 * compilers.
2394 */
2395# ifdef __STDC__
2396# ifndef png_debug
2397# define png_debug(l,m) \
2398 { \
2399 int num_tabs=l; \
2400 fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2401 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2402 }
2403# endif
2404# ifndef png_debug1
2405# define png_debug1(l,m,p1) \
2406 { \
2407 int num_tabs=l; \
2408 fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2409 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2410 }
2411# endif
2412# ifndef png_debug2
2413# define png_debug2(l,m,p1,p2) \
2414 { \
2415 int num_tabs=l; \
2416 fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2417 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2418 }
2419# endif
2420# else /* __STDC __ */
2421# ifndef png_debug
2422# define png_debug(l,m) \
2423 { \
2424 int num_tabs=l; \
2425 char format[256]; \
2426 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2427 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2428 m,PNG_STRING_NEWLINE); \
2429 fprintf(PNG_DEBUG_FILE,format); \
2430 }
2431# endif
2432# ifndef png_debug1
2433# define png_debug1(l,m,p1) \
2434 { \
2435 int num_tabs=l; \
2436 char format[256]; \
2437 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2438 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2439 m,PNG_STRING_NEWLINE); \
2440 fprintf(PNG_DEBUG_FILE,format,p1); \
2441 }
2442# endif
2443# ifndef png_debug2
2444# define png_debug2(l,m,p1,p2) \
2445 { \
2446 int num_tabs=l; \
2447 char format[256]; \
2448 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2449 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2450 m,PNG_STRING_NEWLINE); \
2451 fprintf(PNG_DEBUG_FILE,format,p1,p2); \
2452 }
2453# endif
2454# endif /* __STDC __ */
2455#endif /* (PNG_DEBUG > 1) */
2456
2457#endif /* _MSC_VER */
2458#endif /* (PNG_DEBUG > 0) */
2459#endif /* PNG_DEBUG */
2460#ifndef png_debug
2461#define png_debug(l, m)
2462#endif
2463#ifndef png_debug1
2464#define png_debug1(l, m, p1)
2465#endif
2466#ifndef png_debug2
2467#define png_debug2(l, m, p1, p2)
2468#endif
2469
2470extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2471extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2472extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2473extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2474
2475#ifdef PNG_MNG_FEATURES_SUPPORTED
2476extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2477 png_ptr, png_uint_32 mng_features_permitted));
2478#endif
2479
2480/* For use in png_set_keep_unknown, added to version 1.2.6 */
2481#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2482#define PNG_HANDLE_CHUNK_NEVER 1
2483#define PNG_HANDLE_CHUNK_IF_SAFE 2
2484#define PNG_HANDLE_CHUNK_ALWAYS 3
2485
2486/* Added to version 1.2.0 */
2487#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
2488#ifdef PNG_MMX_CODE_SUPPORTED
2489#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2490#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2491#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2492#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2493#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2494#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2495#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2496#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2497#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2498
2499#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2500 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
2501 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2502 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2503 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2504 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2505#define PNG_MMX_WRITE_FLAGS ( 0 )
2506
2507#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2508 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2509 | PNG_MMX_READ_FLAGS \
2510 | PNG_MMX_WRITE_FLAGS )
2511
2512#define PNG_SELECT_READ 1
2513#define PNG_SELECT_WRITE 2
2514#endif /* PNG_MMX_CODE_SUPPORTED */
2515
2516#ifndef PNG_1_0_X
2517/* pngget.c */
2518extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2519 PNGARG((int flag_select, int *compilerID));
2520
2521/* pngget.c */
2522extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2523 PNGARG((int flag_select));
2524
2525/* pngget.c */
2526extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2527 PNGARG((png_structp png_ptr));
2528
2529/* pngget.c */
2530extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2531 PNGARG((png_structp png_ptr));
2532
2533/* pngget.c */
2534extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2535 PNGARG((png_structp png_ptr));
2536
2537/* pngset.c */
2538extern PNG_EXPORT(void,png_set_asm_flags)
2539 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2540
2541/* pngset.c */
2542extern PNG_EXPORT(void,png_set_mmx_thresholds)
2543 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2544 png_uint_32 mmx_rowbytes_threshold));
2545
2546#endif /* PNG_1_0_X */
2547
2548#ifndef PNG_1_0_X
2549/* png.c, pnggccrd.c, or pngvcrd.c */
2550extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2551#endif /* PNG_1_0_X */
2552#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2553
2554/* Strip the prepended error numbers ("#nnn ") from error and warning
2555 * messages before passing them to the error or warning handler.
2556 */
2557#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2558extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2559 png_ptr, png_uint_32 strip_mode));
2560#endif
2561
2562/* Added at libpng-1.2.6 */
2563#ifdef PNG_SET_USER_LIMITS_SUPPORTED
2564extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2565 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2566extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2567 png_ptr));
2568extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2569 png_ptr));
2570#endif
2571/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
2572 * project defs
2573 */
2574
2575#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2576/* With these routines we avoid an integer divide, which will be slower on
2577 * most machines. However, it does take more operations than the corresponding
2578 * divide method, so it may be slower on a few RISC systems. There are two
2579 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2580 *
2581 * Note that the rounding factors are NOT supposed to be the same! 128 and
2582 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2583 * standard method.
2584 *
2585 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2586 */
2587
2588 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2589
2590# define png_composite(composite, fg, alpha, bg) \
2591 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2592 + (png_uint_16)(bg)*(png_uint_16)(255 - \
2593 (png_uint_16)(alpha)) + (png_uint_16)128); \
2594 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2595
2596# define png_composite_16(composite, fg, alpha, bg) \
2597 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2598 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
2599 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2600 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2601
2602#else /* Standard method using integer division */
2603
2604# define png_composite(composite, fg, alpha, bg) \
2605 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2606 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2607 (png_uint_16)127) / 255)
2608
2609# define png_composite_16(composite, fg, alpha, bg) \
2610 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2611 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2612 (png_uint_32)32767) / (png_uint_32)65535L)
2613
2614#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2615
2616/* Inline macros to do direct reads of bytes from the input buffer. These
2617 * require that you are using an architecture that uses PNG byte ordering
2618 * (MSB first) and supports unaligned data storage. I think that PowerPC
2619 * in big-endian mode and 680x0 are the only ones that will support this.
2620 * The x86 line of processors definitely do not. The png_get_int_32()
2621 * routine also assumes we are using two's complement format for negative
2622 * values, which is almost certainly true.
2623 */
2624#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
2625# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2626# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2627# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2628#else
2629extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2630extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2631extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2632#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2633extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2634 PNGARG((png_structp png_ptr, png_bytep buf));
2635/* No png_get_int_16 -- may be added if there's a real need for it. */
2636
2637/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2638 */
2639extern PNG_EXPORT(void,png_save_uint_32)
2640 PNGARG((png_bytep buf, png_uint_32 i));
2641extern PNG_EXPORT(void,png_save_int_32)
2642 PNGARG((png_bytep buf, png_int_32 i));
2643
2644/* Place a 16-bit number into a buffer in PNG byte order.
2645 * The parameter is declared unsigned int, not png_uint_16,
2646 * just to avoid potential problems on pre-ANSI C compilers.
2647 */
2648extern PNG_EXPORT(void,png_save_uint_16)
2649 PNGARG((png_bytep buf, unsigned int i));
2650/* No png_save_int_16 -- may be added if there's a real need for it. */
2651
2652/* ************************************************************************* */
2653
2654/* These next functions are used internally in the code. They generally
2655 * shouldn't be used unless you are writing code to add or replace some
2656 * functionality in libpng. More information about most functions can
2657 * be found in the files where the functions are located.
2658 */
2659
2660
2661/* Various modes of operation, that are visible to applications because
2662 * they are used for unknown chunk location.
2663 */
2664#define PNG_HAVE_IHDR 0x01
2665#define PNG_HAVE_PLTE 0x02
2666#define PNG_HAVE_IDAT 0x04
2667#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2668#define PNG_HAVE_IEND 0x10
2669
2670#ifdef PNG_INTERNAL
2671
2672/* More modes of operation. Note that after an init, mode is set to
2673 * zero automatically when the structure is created.
2674 */
2675#define PNG_HAVE_gAMA 0x20
2676#define PNG_HAVE_cHRM 0x40
2677#define PNG_HAVE_sRGB 0x80
2678#define PNG_HAVE_CHUNK_HEADER 0x100
2679#define PNG_WROTE_tIME 0x200
2680#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2681#define PNG_BACKGROUND_IS_GRAY 0x800
2682#define PNG_HAVE_PNG_SIGNATURE 0x1000
2683#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2684
2685/* Flags for the transformations the PNG library does on the image data */
2686#define PNG_BGR 0x0001
2687#define PNG_INTERLACE 0x0002
2688#define PNG_PACK 0x0004
2689#define PNG_SHIFT 0x0008
2690#define PNG_SWAP_BYTES 0x0010
2691#define PNG_INVERT_MONO 0x0020
2692#define PNG_DITHER 0x0040
2693#define PNG_BACKGROUND 0x0080
2694#define PNG_BACKGROUND_EXPAND 0x0100
2695 /* 0x0200 unused */
2696#define PNG_16_TO_8 0x0400
2697#define PNG_RGBA 0x0800
2698#define PNG_EXPAND 0x1000
2699#define PNG_GAMMA 0x2000
2700#define PNG_GRAY_TO_RGB 0x4000
2701#define PNG_FILLER 0x8000L
2702#define PNG_PACKSWAP 0x10000L
2703#define PNG_SWAP_ALPHA 0x20000L
2704#define PNG_STRIP_ALPHA 0x40000L
2705#define PNG_INVERT_ALPHA 0x80000L
2706#define PNG_USER_TRANSFORM 0x100000L
2707#define PNG_RGB_TO_GRAY_ERR 0x200000L
2708#define PNG_RGB_TO_GRAY_WARN 0x400000L
2709#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2710 /* 0x800000L Unused */
2711#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2712#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2713#define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */
2714 /* by volker */
2715 /* 0x8000000L unused */
2716 /* 0x10000000L unused */
2717 /* 0x20000000L unused */
2718 /* 0x40000000L unused */
2719
2720/* Flags for png_create_struct */
2721#define PNG_STRUCT_PNG 0x0001
2722#define PNG_STRUCT_INFO 0x0002
2723
2724/* Scaling factor for filter heuristic weighting calculations */
2725#define PNG_WEIGHT_SHIFT 8
2726#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2727#define PNG_COST_SHIFT 3
2728#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2729
2730/* Flags for the png_ptr->flags rather than declaring a byte for each one */
2731#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2732#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2733#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2734#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2735#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2736#define PNG_FLAG_ZLIB_FINISHED 0x0020
2737#define PNG_FLAG_ROW_INIT 0x0040
2738#define PNG_FLAG_FILLER_AFTER 0x0080
2739#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2740#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2741#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2742#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2743#define PNG_FLAG_FREE_PLTE 0x1000
2744#define PNG_FLAG_FREE_TRNS 0x2000
2745#define PNG_FLAG_FREE_HIST 0x4000
2746#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2747#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2748#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2749#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2750#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2751#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2752#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2753#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2754 /* 0x800000L unused */
2755 /* 0x1000000L unused */
2756 /* 0x2000000L unused */
2757 /* 0x4000000L unused */
2758 /* 0x8000000L unused */
2759 /* 0x10000000L unused */
2760 /* 0x20000000L unused */
2761 /* 0x40000000L unused */
2762
2763#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2764 PNG_FLAG_CRC_ANCILLARY_NOWARN)
2765
2766#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2767 PNG_FLAG_CRC_CRITICAL_IGNORE)
2768
2769#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2770 PNG_FLAG_CRC_CRITICAL_MASK)
2771
2772/* Save typing and make code easier to understand */
2773
2774#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2775 abs((int)((c1).green) - (int)((c2).green)) + \
2776 abs((int)((c1).blue) - (int)((c2).blue)))
2777
2778/* Added to libpng-1.2.6 JB */
2779#define PNG_ROWBYTES(pixel_bits, width) \
2780 ((pixel_bits) >= 8 ? \
2781 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2782 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2783
2784/* PNG_OUT_OF_RANGE returns true if value is outside the range
2785 * ideal-delta..ideal+delta. Each argument is evaluated twice.
2786 * "ideal" and "delta" should be constants, normally simple
2787 * integers, "value" a variable. Added to libpng-1.2.6 JB
2788 */
2789#define PNG_OUT_OF_RANGE(value, ideal, delta) \
2790 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2791
2792/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2793#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2794/* Place to hold the signature string for a PNG file. */
2795#ifdef PNG_USE_GLOBAL_ARRAYS
2796 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
2797#else
2798#endif
2799#endif /* PNG_NO_EXTERN */
2800
2801/* Constant strings for known chunk types. If you need to add a chunk,
2802 * define the name here, and add an invocation of the macro in png.c and
2803 * wherever it's needed.
2804 */
2805#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2806#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2807#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2808#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2809#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2810#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2811#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2812#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2813#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2814#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2815#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2816#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2817#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2818#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2819#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2820#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2821#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2822#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2823#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2824#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2825#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2826
2827#ifdef PNG_USE_GLOBAL_ARRAYS
2828PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
2829PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
2830PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
2831PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
2832PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
2833PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
2834PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
2835PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
2836PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
2837PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
2838PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
2839PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
2840PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
2841PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
2842PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
2843PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
2844PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
2845PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
2846PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
2847PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
2848PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
2849#endif /* PNG_USE_GLOBAL_ARRAYS */
2850
2851#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2852/* Initialize png_ptr struct for reading, and allocate any other memory.
2853 * (old interface - DEPRECATED - use png_create_read_struct instead).
2854 */
2855extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr))
2856 PNG_DEPRECATED;
2857#undef png_read_init
2858#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2859 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2860#endif
2861
2862extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2863 png_const_charp user_png_ver, png_size_t png_struct_size));
2864#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2865extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2866 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2867 png_info_size));
2868#endif
2869
2870#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
2871/* Initialize png_ptr struct for writing, and allocate any other memory.
2872 * (old interface - DEPRECATED - use png_create_write_struct instead).
2873 */
2874extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr))
2875 PNG_DEPRECATED;
2876#undef png_write_init
2877#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2878 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2879#endif
2880
2881extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2882 png_const_charp user_png_ver, png_size_t png_struct_size));
2883extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2884 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2885 png_info_size));
2886
2887/* Allocate memory for an internal libpng struct */
2888PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE;
2889
2890/* Free memory from internal libpng struct */
2891PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE;
2892
2893PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2894 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE;
2895PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2896 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE;
2897
2898/* Free any memory that info_ptr points to and reset struct. */
2899PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2900 png_infop info_ptr)) PNG_PRIVATE;
2901
2902#ifndef PNG_1_0_X
2903/* Function to allocate memory for zlib. */
2904PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items,
2905 uInt size)) PNG_PRIVATE;
2906
2907/* Function to free memory for zlib */
2908PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE;
2909
2910#ifdef PNG_SIZE_T
2911/* Function to convert a sizeof an item to png_sizeof item */
2912 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size))
2913 PNG_PRIVATE;
2914#endif
2915
2916/* Next four functions are used internally as callbacks. PNGAPI is required
2917 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3.
2918 */
2919
2920PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
2921 png_bytep data, png_size_t length)) PNG_PRIVATE;
2922
2923#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2924PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
2925 png_bytep buffer, png_size_t length)) PNG_PRIVATE;
2926#endif
2927
2928PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
2929 png_bytep data, png_size_t length)) PNG_PRIVATE;
2930
2931#ifdef PNG_WRITE_FLUSH_SUPPORTED
2932#ifdef PNG_STDIO_SUPPORTED
2933PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr))
2934 PNG_PRIVATE;
2935#endif
2936#endif
2937#else /* PNG_1_0_X */
2938#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2939PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
2940 png_bytep buffer, png_size_t length)) PNG_PRIVATE;
2941#endif
2942#endif /* PNG_1_0_X */
2943
2944/* Reset the CRC variable */
2945PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
2946
2947/* Write the "data" buffer to whatever output you are using. */
2948PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
2949 png_size_t length)) PNG_PRIVATE;
2950
2951/* Read data from whatever input you are using into the "data" buffer */
2952PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
2953 png_size_t length)) PNG_PRIVATE;
2954
2955/* Read bytes into buf, and update png_ptr->crc */
2956PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
2957 png_size_t length)) PNG_PRIVATE;
2958
2959/* Decompress data in a chunk that uses compression */
2960#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
2961 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
2962PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
2963 int comp_type, png_size_t chunklength,
2964 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE;
2965#endif
2966
2967/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
2968PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)
2969 PNG_PRIVATE);
2970
2971/* Read the CRC from the file and compare it to the libpng calculated CRC */
2972PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE;
2973
2974/* Calculate the CRC over a section of data. Note that we are only
2975 * passing a maximum of 64K on systems that have this as a memory limit,
2976 * since this is the maximum buffer size we can specify.
2977 */
2978PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
2979 png_size_t length)) PNG_PRIVATE;
2980
2981#ifdef PNG_WRITE_FLUSH_SUPPORTED
2982PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE;
2983#endif
2984
2985/* Simple function to write the signature */
2986PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE;
2987
2988/* Write various chunks */
2989
2990/* Write the IHDR chunk, and update the png_struct with the necessary
2991 * information.
2992 */
2993PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
2994 png_uint_32 height,
2995 int bit_depth, int color_type, int compression_method, int filter_method,
2996 int interlace_method)) PNG_PRIVATE;
2997
2998PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
2999 png_uint_32 num_pal)) PNG_PRIVATE;
3000
3001PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3002 png_size_t length)) PNG_PRIVATE;
3003
3004PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3005
3006#ifdef PNG_WRITE_gAMA_SUPPORTED
3007#ifdef PNG_FLOATING_POINT_SUPPORTED
3008PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma))
3009 PNG_PRIVATE;
3010#endif
3011#ifdef PNG_FIXED_POINT_SUPPORTED
3012PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
3013 png_fixed_point file_gamma)) PNG_PRIVATE;
3014#endif
3015#endif
3016
3017#ifdef PNG_WRITE_sBIT_SUPPORTED
3018PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3019 int color_type)) PNG_PRIVATE;
3020#endif
3021
3022#ifdef PNG_WRITE_cHRM_SUPPORTED
3023#ifdef PNG_FLOATING_POINT_SUPPORTED
3024PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3025 double white_x, double white_y,
3026 double red_x, double red_y, double green_x, double green_y,
3027 double blue_x, double blue_y)) PNG_PRIVATE;
3028#endif
3029#ifdef PNG_FIXED_POINT_SUPPORTED
3030PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3031 png_fixed_point int_white_x, png_fixed_point int_white_y,
3032 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3033 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3034 png_fixed_point int_blue_y)) PNG_PRIVATE;
3035#endif
3036#endif
3037
3038#ifdef PNG_WRITE_sRGB_SUPPORTED
3039PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3040 int intent)) PNG_PRIVATE;
3041#endif
3042
3043#ifdef PNG_WRITE_iCCP_SUPPORTED
3044PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3045 png_charp name, int compression_type,
3046 png_charp profile, int proflen)) PNG_PRIVATE;
3047 /* Note to maintainer: profile should be png_bytep */
3048#endif
3049
3050#ifdef PNG_WRITE_sPLT_SUPPORTED
3051PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3052 png_sPLT_tp palette)) PNG_PRIVATE;
3053#endif
3054
3055#ifdef PNG_WRITE_tRNS_SUPPORTED
3056PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3057 png_color_16p values, int number, int color_type)) PNG_PRIVATE;
3058#endif
3059
3060#ifdef PNG_WRITE_bKGD_SUPPORTED
3061PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3062 png_color_16p values, int color_type)) PNG_PRIVATE;
3063#endif
3064
3065#ifdef PNG_WRITE_hIST_SUPPORTED
3066PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3067 int num_hist)) PNG_PRIVATE;
3068#endif
3069
3070#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3071 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3072PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3073 png_charp key, png_charpp new_key)) PNG_PRIVATE;
3074#endif
3075
3076#ifdef PNG_WRITE_tEXt_SUPPORTED
3077PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3078 png_charp text, png_size_t text_len)) PNG_PRIVATE;
3079#endif
3080
3081#ifdef PNG_WRITE_zTXt_SUPPORTED
3082PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3083 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE;
3084#endif
3085
3086#ifdef PNG_WRITE_iTXt_SUPPORTED
3087PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3088 int compression, png_charp key, png_charp lang, png_charp lang_key,
3089 png_charp text)) PNG_PRIVATE;
3090#endif
3091
3092#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
3093PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3094 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE;
3095#endif
3096
3097#ifdef PNG_WRITE_oFFs_SUPPORTED
3098PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3099 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE;
3100#endif
3101
3102#ifdef PNG_WRITE_pCAL_SUPPORTED
3103PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3104 png_int_32 X0, png_int_32 X1, int type, int nparams,
3105 png_charp units, png_charpp params)) PNG_PRIVATE;
3106#endif
3107
3108#ifdef PNG_WRITE_pHYs_SUPPORTED
3109PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3110 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3111 int unit_type)) PNG_PRIVATE;
3112#endif
3113
3114#ifdef PNG_WRITE_tIME_SUPPORTED
3115PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3116 png_timep mod_time)) PNG_PRIVATE;
3117#endif
3118
3119#ifdef PNG_WRITE_sCAL_SUPPORTED
3120#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3121PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3122 int unit, double width, double height)) PNG_PRIVATE;
3123#else
3124#ifdef PNG_FIXED_POINT_SUPPORTED
3125PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3126 int unit, png_charp width, png_charp height)) PNG_PRIVATE;
3127#endif
3128#endif
3129#endif
3130
3131/* Called when finished processing a row of data */
3132PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3133
3134/* Internal use only. Called before first row of data */
3135PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3136
3137#ifdef PNG_READ_GAMMA_SUPPORTED
3138PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3139#endif
3140
3141/* Combine a row of data, dealing with alpha, etc. if requested */
3142PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3143 int mask)) PNG_PRIVATE;
3144
3145#ifdef PNG_READ_INTERLACING_SUPPORTED
3146/* Expand an interlaced row */
3147/* OLD pre-1.0.9 interface:
3148PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3149 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE;
3150 */
3151PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3152#endif
3153
3154/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3155
3156#ifdef PNG_WRITE_INTERLACING_SUPPORTED
3157/* Grab pixels out of a row for an interlaced pass */
3158PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3159 png_bytep row, int pass)) PNG_PRIVATE;
3160#endif
3161
3162/* Unfilter a row */
3163PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3164 png_row_infop row_info, png_bytep row, png_bytep prev_row,
3165 int filter)) PNG_PRIVATE;
3166
3167/* Choose the best filter to use and filter the row data */
3168PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3169 png_row_infop row_info)) PNG_PRIVATE;
3170
3171/* Write out the filtered row. */
3172PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3173 png_bytep filtered_row)) PNG_PRIVATE;
3174/* Finish a row while reading, dealing with interlacing passes, etc. */
3175PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3176
3177/* Initialize the row buffers, etc. */
3178PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3179/* Optional call to update the users info structure */
3180PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3181 png_infop info_ptr)) PNG_PRIVATE;
3182
3183/* These are the functions that do the transformations */
3184#ifdef PNG_READ_FILLER_SUPPORTED
3185PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3186 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE;
3187#endif
3188
3189#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
3190PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3191 png_bytep row)) PNG_PRIVATE;
3192#endif
3193
3194#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
3195PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3196 png_bytep row)) PNG_PRIVATE;
3197#endif
3198
3199#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
3200PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3201 png_bytep row)) PNG_PRIVATE;
3202#endif
3203
3204#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
3205PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3206 png_bytep row)) PNG_PRIVATE;
3207#endif
3208
3209#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3210 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3211PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3212 png_bytep row, png_uint_32 flags)) PNG_PRIVATE;
3213#endif
3214
3215#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3216PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
3217 png_bytep row)) PNG_PRIVATE;
3218#endif
3219
3220#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3221PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
3222 png_bytep row)) PNG_PRIVATE;
3223#endif
3224
3225#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
3226PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3227 row_info, png_bytep row)) PNG_PRIVATE;
3228#endif
3229
3230#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
3231PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3232 png_bytep row)) PNG_PRIVATE;
3233#endif
3234
3235#ifdef PNG_READ_PACK_SUPPORTED
3236PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
3237 png_bytep row)) PNG_PRIVATE;
3238#endif
3239
3240#ifdef PNG_READ_SHIFT_SUPPORTED
3241PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3242 png_color_8p sig_bits)) PNG_PRIVATE;
3243#endif
3244
3245#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3246PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
3247 png_bytep row)) PNG_PRIVATE;
3248#endif
3249
3250#ifdef PNG_READ_16_TO_8_SUPPORTED
3251PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
3252 png_bytep row)) PNG_PRIVATE;
3253#endif
3254
3255#ifdef PNG_READ_DITHER_SUPPORTED
3256PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3257 png_bytep row, png_bytep palette_lookup,
3258 png_bytep dither_lookup)) PNG_PRIVATE;
3259
3260# ifdef PNG_CORRECT_PALETTE_SUPPORTED
3261PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3262 png_colorp palette, int num_palette)) PNG_PRIVATE;
3263# endif
3264#endif
3265
3266#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3267PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
3268 png_bytep row)) PNG_PRIVATE;
3269#endif
3270
3271#ifdef PNG_WRITE_PACK_SUPPORTED
3272PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3273 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE;
3274#endif
3275
3276#ifdef PNG_WRITE_SHIFT_SUPPORTED
3277PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3278 png_color_8p bit_depth)) PNG_PRIVATE;
3279#endif
3280
3281#ifdef PNG_READ_BACKGROUND_SUPPORTED
3282#ifdef PNG_READ_GAMMA_SUPPORTED
3283PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3284 png_color_16p trans_values, png_color_16p background,
3285 png_color_16p background_1,
3286 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3287 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3288 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE;
3289#else
3290PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3291 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE;
3292#endif
3293#endif
3294
3295#ifdef PNG_READ_GAMMA_SUPPORTED
3296PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3297 png_bytep gamma_table, png_uint_16pp gamma_16_table,
3298 int gamma_shift)) PNG_PRIVATE;
3299#endif
3300
3301#ifdef PNG_READ_EXPAND_SUPPORTED
3302PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3303 png_bytep row, png_colorp palette, png_bytep trans,
3304 int num_trans)) PNG_PRIVATE;
3305PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3306 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE;
3307#endif
3308
3309/* The following decodes the appropriate chunks, and does error correction,
3310 * then calls the appropriate callback for the chunk if it is valid.
3311 */
3312
3313/* Decode the IHDR chunk */
3314PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3315 png_uint_32 length)) PNG_PRIVATE;
3316PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3317 png_uint_32 length));
3318PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3319 png_uint_32 length));
3320
3321#ifdef PNG_READ_bKGD_SUPPORTED
3322PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3323 png_uint_32 length)) PNG_PRIVATE;
3324#endif
3325
3326#ifdef PNG_READ_cHRM_SUPPORTED
3327PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3328 png_uint_32 length)) PNG_PRIVATE;
3329#endif
3330
3331#ifdef PNG_READ_gAMA_SUPPORTED
3332PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3333 png_uint_32 length)) PNG_PRIVATE;
3334#endif
3335
3336#ifdef PNG_READ_hIST_SUPPORTED
3337PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3338 png_uint_32 length)) PNG_PRIVATE;
3339#endif
3340
3341#ifdef PNG_READ_iCCP_SUPPORTED
3342extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3343 png_uint_32 length));
3344#endif /* PNG_READ_iCCP_SUPPORTED */
3345
3346#ifdef PNG_READ_iTXt_SUPPORTED
3347PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3348 png_uint_32 length)) PNG_PRIVATE;
3349#endif
3350
3351#ifdef PNG_READ_oFFs_SUPPORTED
3352PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3353 png_uint_32 length)) PNG_PRIVATE;
3354#endif
3355
3356#ifdef PNG_READ_pCAL_SUPPORTED
3357PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3358 png_uint_32 length)) PNG_PRIVATE;
3359#endif
3360
3361#ifdef PNG_READ_pHYs_SUPPORTED
3362PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3363 png_uint_32 length)) PNG_PRIVATE;
3364#endif
3365
3366#ifdef PNG_READ_sBIT_SUPPORTED
3367PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3368 png_uint_32 length)) PNG_PRIVATE;
3369#endif
3370
3371#ifdef PNG_READ_sCAL_SUPPORTED
3372PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3373 png_uint_32 length)) PNG_PRIVATE;
3374#endif
3375
3376#ifdef PNG_READ_sPLT_SUPPORTED
3377extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3378 png_uint_32 length)) PNG_PRIVATE;
3379#endif /* PNG_READ_sPLT_SUPPORTED */
3380
3381#ifdef PNG_READ_sRGB_SUPPORTED
3382PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3383 png_uint_32 length)) PNG_PRIVATE;
3384#endif
3385
3386#ifdef PNG_READ_tEXt_SUPPORTED
3387PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3388 png_uint_32 length)) PNG_PRIVATE;
3389#endif
3390
3391#ifdef PNG_READ_tIME_SUPPORTED
3392PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3393 png_uint_32 length)) PNG_PRIVATE;
3394#endif
3395
3396#ifdef PNG_READ_tRNS_SUPPORTED
3397PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3398 png_uint_32 length)) PNG_PRIVATE;
3399#endif
3400
3401#ifdef PNG_READ_zTXt_SUPPORTED
3402PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3403 png_uint_32 length)) PNG_PRIVATE;
3404#endif
3405
3406PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3407 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3408
3409PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3410 png_bytep chunk_name)) PNG_PRIVATE;
3411
3412/* Handle the transformations for reading and writing */
3413PNG_EXTERN void png_do_read_transformations
3414 PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3415PNG_EXTERN void png_do_write_transformations
3416 PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3417
3418PNG_EXTERN void png_init_read_transformations
3419 PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3420
3421#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3422PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3423 png_infop info_ptr)) PNG_PRIVATE;
3424PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3425 png_infop info_ptr)) PNG_PRIVATE;
3426PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3427PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3428 png_uint_32 length)) PNG_PRIVATE;
3429PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3430PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3431PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3432 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
3433PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3434PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3435 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
3436PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3437PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3438 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3439PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3440 png_infop info_ptr)) PNG_PRIVATE;
3441PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3442 png_infop info_ptr)) PNG_PRIVATE;
3443PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr,
3444 png_bytep row)) PNG_PRIVATE;
3445PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3446 png_infop info_ptr)) PNG_PRIVATE;
3447PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3448 png_infop info_ptr)) PNG_PRIVATE;
3449PNG_EXTERN void png_read_push_finish_row
3450 PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3451#ifdef PNG_READ_tEXt_SUPPORTED
3452PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3453 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3454PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3455 png_infop info_ptr)) PNG_PRIVATE;
3456#endif
3457#ifdef PNG_READ_zTXt_SUPPORTED
3458PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3459 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3460PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3461 png_infop info_ptr)) PNG_PRIVATE;
3462#endif
3463#ifdef PNG_READ_iTXt_SUPPORTED
3464PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3465 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3466PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3467 png_infop info_ptr)) PNG_PRIVATE;
3468#endif
3469
3470#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3471
3472#ifdef PNG_MNG_FEATURES_SUPPORTED
3473PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3474 png_bytep row)) PNG_PRIVATE;
3475PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3476 png_bytep row)) PNG_PRIVATE;
3477#endif
3478
3479#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
3480#ifdef PNG_MMX_CODE_SUPPORTED
3481/* png.c */ /* PRIVATE */
3482PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3483#endif
3484#endif
3485
3486
3487/* The following six functions will be exported in libpng-1.4.0. */
3488#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3489PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3490png_infop info_ptr));
3491
3492PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3493png_infop info_ptr));
3494
3495PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3496png_infop info_ptr));
3497
3498PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3499png_infop info_ptr));
3500
3501PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3502png_infop info_ptr));
3503
3504#ifdef PNG_pHYs_SUPPORTED
3505PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3506png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3507#endif /* PNG_pHYs_SUPPORTED */
3508#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3509
3510/* Read the chunk header (length + type name) */
3511PNG_EXTERN png_uint_32 png_read_chunk_header
3512 PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3513
3514/* Added at libpng version 1.2.34 */
3515#ifdef PNG_cHRM_SUPPORTED
3516PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
3517 png_fixed_point int_white_x, png_fixed_point int_white_y,
3518 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3519 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3520 png_fixed_point int_blue_y)) PNG_PRIVATE;
3521#endif
3522
3523#ifdef PNG_cHRM_SUPPORTED
3524#ifdef PNG_CHECK_cHRM_SUPPORTED
3525/* Added at libpng version 1.2.34 */
3526PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
3527 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE;
3528#endif
3529#endif
3530
3531/* Added at libpng version 1.2.41 */
3532PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
3533 png_uint_32 width, png_uint_32 height, int bit_depth,
3534 int color_type, int interlace_type, int compression_type,
3535 int filter_type)) PNG_PRIVATE;
3536
3537/* Added at libpng version 1.2.41 */
3538PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr,
3539 png_uint_32 size));
3540
3541/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3542
3543#endif /* PNG_INTERNAL */
3544
3545#ifdef __cplusplus
3546}
3547#endif
3548
3549#endif /* PNG_VERSION_INFO_ONLY */
3550/* Do not put anything past this line */
3551#endif /* PNG_H */
3552