dc564ed59d8269018808ff2aa930aa51323b5cdf
[reactos.git] / reactos / dll / 3rdparty / libpng / pngpriv.h
1
2 /* pngpriv.h - private declarations for use inside libpng
3 *
4 * Last changed in libpng 1.6.18 [July 23, 2015]
5 * Copyright (c) 1998-2015 Glenn Randers-Pehrson
6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
8 *
9 * This code is released under the libpng license.
10 * For conditions of distribution and use, see the disclaimer
11 * and license in png.h
12 */
13
14 /* The symbols declared in this file (including the functions declared
15 * as extern) are PRIVATE. They are not part of the libpng public
16 * interface, and are not recommended for use by regular applications.
17 * Some of them may become public in the future; others may stay private,
18 * change in an incompatible way, or even disappear.
19 * Although the libpng users are not forbidden to include this header,
20 * they should be well aware of the issues that may arise from doing so.
21 */
22
23 #ifndef PNGPRIV_H
24 #define PNGPRIV_H
25
26 /* Feature Test Macros. The following are defined here to ensure that correctly
27 * implemented libraries reveal the APIs libpng needs to build and hide those
28 * that are not needed and potentially damaging to the compilation.
29 *
30 * Feature Test Macros must be defined before any system header is included (see
31 * POSIX 1003.1 2.8.2 "POSIX Symbols."
32 *
33 * These macros only have an effect if the operating system supports either
34 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
35 * Windows/Visual Studio) there is no effect; the OS specific tests below are
36 * still required (as of 2011-05-02.)
37 */
38 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
39
40 #ifndef PNG_VERSION_INFO_ONLY
41 /* Standard library headers not required by png.h: */
42 # include <stdlib.h>
43 # include <string.h>
44 #endif
45
46 #define PNGLIB_BUILD /*libpng is being built, not used*/
47
48 /* If HAVE_CONFIG_H is defined during the build then the build system must
49 * provide an appropriate "config.h" file on the include path. The header file
50 * must provide definitions as required below (search for "HAVE_CONFIG_H");
51 * see configure.ac for more details of the requirements. The macro
52 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
53 * 'configure'; define this macro to prevent the configure build including the
54 * configure generated config.h. Libpng is expected to compile without *any*
55 * special build system support on a reasonably ANSI-C compliant system.
56 */
57 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
58 # include <config.h>
59
60 /* Pick up the definition of 'restrict' from config.h if it was read: */
61 # define PNG_RESTRICT restrict
62 #endif
63
64 /* To support symbol prefixing it is necessary to know *before* including png.h
65 * whether the fixed point (and maybe other) APIs are exported, because if they
66 * are not internal definitions may be required. This is handled below just
67 * before png.h is included, but load the configuration now if it is available.
68 */
69 #ifndef PNGLCONF_H
70 # include "pnglibconf.h"
71 #endif
72
73 /* Local renames may change non-exported API functions from png.h */
74 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
75 # include "pngprefix.h"
76 #endif
77
78 #ifdef PNG_USER_CONFIG
79 # include "pngusr.h"
80 /* These should have been defined in pngusr.h */
81 # ifndef PNG_USER_PRIVATEBUILD
82 # define PNG_USER_PRIVATEBUILD "Custom libpng build"
83 # endif
84 # ifndef PNG_USER_DLLFNAME_POSTFIX
85 # define PNG_USER_DLLFNAME_POSTFIX "Cb"
86 # endif
87 #endif
88
89 /* Compile time options.
90 * =====================
91 * In a multi-arch build the compiler may compile the code several times for the
92 * same object module, producing different binaries for different architectures.
93 * When this happens configure-time setting of the target host options cannot be
94 * done and this interferes with the handling of the ARM NEON optimizations, and
95 * possibly other similar optimizations. Put additional tests here; in general
96 * this is needed when the same option can be changed at both compile time and
97 * run time depending on the target OS (i.e. iOS vs Android.)
98 *
99 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
100 * this is not possible with certain compilers (Oracle SUN OS CC), as a result
101 * it is necessary to ensure that all extern functions that *might* be used
102 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
103 * below is one example of this behavior because it is controlled by the
104 * presence or not of -mfpu=neon on the GCC command line, it is possible to do
105 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
106 * do this.
107 */
108 #ifndef PNG_ARM_NEON_OPT
109 /* ARM NEON optimizations are being controlled by the compiler settings,
110 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
111 * with GCC) then the compiler will define __ARM_NEON__ and we can rely
112 * unconditionally on NEON instructions not crashing, otherwise we must
113 * disable use of NEON instructions.
114 *
115 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
116 * can only be turned on automatically if that is supported too. If
117 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
118 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
119 * off.
120 *
121 * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated
122 * __ARM_NEON__, so we check both variants.
123 *
124 * To disable ARM_NEON optimizations entirely, and skip compiling the
125 * associated assembler code, pass --enable-arm-neon=no to configure
126 * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS.
127 */
128 # if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
129 defined(PNG_ALIGNED_MEMORY_SUPPORTED)
130 # define PNG_ARM_NEON_OPT 2
131 # else
132 # define PNG_ARM_NEON_OPT 0
133 # endif
134 #endif
135
136 #if PNG_ARM_NEON_OPT > 0
137 /* NEON optimizations are to be at least considered by libpng, so enable the
138 * callbacks to do this.
139 */
140 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
141
142 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
143 * if possible - if __ARM_NEON__ is set and the compiler version is not known
144 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
145 * be:
146 *
147 * 1 The intrinsics code (the default with __ARM_NEON__)
148 * 2 The hand coded assembler (the default without __ARM_NEON__)
149 *
150 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
151 * this is *NOT* supported and may cease to work even after a minor revision
152 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
153 * testing or a new compiler, but the results should be communicated to the
154 * libpng implementation list for incorporation in the next minor release.
155 */
156 # ifndef PNG_ARM_NEON_IMPLEMENTATION
157 # if defined(__ARM_NEON__) || defined(__ARM_NEON)
158 # if defined(__clang__)
159 /* At present it is unknown by the libpng developers which versions
160 * of clang support the intrinsics, however some or perhaps all
161 * versions do not work with the assembler so this may be
162 * irrelevant, so just use the default (do nothing here.)
163 */
164 # elif defined(__GNUC__)
165 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
166 * work, so if this *is* GCC, or G++, look for a version >4.5
167 */
168 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
169 # define PNG_ARM_NEON_IMPLEMENTATION 2
170 # endif /* no GNUC support */
171 # endif /* __GNUC__ */
172 # else /* !defined __ARM_NEON__ */
173 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
174 */
175 # define PNG_ARM_NEON_IMPLEMENTATION 2
176 # endif /* __ARM_NEON__ */
177 # endif /* !PNG_ARM_NEON_IMPLEMENTATION */
178
179 # ifndef PNG_ARM_NEON_IMPLEMENTATION
180 /* Use the intrinsics code by default. */
181 # define PNG_ARM_NEON_IMPLEMENTATION 1
182 # endif
183 #endif /* PNG_ARM_NEON_OPT > 0 */
184
185 /* Is this a build of a DLL where compilation of the object modules requires
186 * different preprocessor settings to those required for a simple library? If
187 * so PNG_BUILD_DLL must be set.
188 *
189 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
190 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
191 * static library of libpng then link the DLL against that.
192 */
193 #ifndef PNG_BUILD_DLL
194 # ifdef DLL_EXPORT
195 /* This is set by libtool when files are compiled for a DLL; libtool
196 * always compiles twice, even on systems where it isn't necessary. Set
197 * PNG_BUILD_DLL in case it is necessary:
198 */
199 # define PNG_BUILD_DLL
200 # else
201 # ifdef _WINDLL
202 /* This is set by the Microsoft Visual Studio IDE in projects that
203 * build a DLL. It can't easily be removed from those projects (it
204 * isn't visible in the Visual Studio UI) so it is a fairly reliable
205 * indication that PNG_IMPEXP needs to be set to the DLL export
206 * attributes.
207 */
208 # define PNG_BUILD_DLL
209 # else
210 # ifdef __DLL__
211 /* This is set by the Borland C system when compiling for a DLL
212 * (as above.)
213 */
214 # define PNG_BUILD_DLL
215 # else
216 /* Add additional compiler cases here. */
217 # endif
218 # endif
219 # endif
220 #endif /* Setting PNG_BUILD_DLL if required */
221
222 /* See pngconf.h for more details: the builder of the library may set this on
223 * the command line to the right thing for the specific compilation system or it
224 * may be automagically set above (at present we know of no system where it does
225 * need to be set on the command line.)
226 *
227 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
228 * setting it to the "import" setting for a DLL build.
229 */
230 #ifndef PNG_IMPEXP
231 # ifdef PNG_BUILD_DLL
232 # define PNG_IMPEXP PNG_DLL_EXPORT
233 # else
234 /* Not building a DLL, or the DLL doesn't require specific export
235 * definitions.
236 */
237 # define PNG_IMPEXP
238 # endif
239 #endif
240
241 /* No warnings for private or deprecated functions in the build: */
242 #ifndef PNG_DEPRECATED
243 # define PNG_DEPRECATED
244 #endif
245 #ifndef PNG_PRIVATE
246 # define PNG_PRIVATE
247 #endif
248
249 /* Symbol preprocessing support.
250 *
251 * To enable listing global, but internal, symbols the following macros should
252 * always be used to declare an extern data or function object in this file.
253 */
254 #ifndef PNG_INTERNAL_DATA
255 # define PNG_INTERNAL_DATA(type, name, array) PNG_LINKAGE_DATA type name array
256 #endif
257
258 #ifndef PNG_INTERNAL_FUNCTION
259 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
260 PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
261 #endif
262
263 #ifndef PNG_INTERNAL_CALLBACK
264 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
265 PNG_LINKAGE_CALLBACK PNG_FUNCTION(type, (PNGCBAPI name), args,\
266 PNG_EMPTY attributes)
267 #endif
268
269 /* If floating or fixed point APIs are disabled they may still be compiled
270 * internally. To handle this make sure they are declared as the appropriate
271 * internal extern function (otherwise the symbol prefixing stuff won't work and
272 * the functions will be used without definitions.)
273 *
274 * NOTE: although all the API functions are declared here they are not all
275 * actually built! Because the declarations are still made it is necessary to
276 * fake out types that they depend on.
277 */
278 #ifndef PNG_FP_EXPORT
279 # ifndef PNG_FLOATING_POINT_SUPPORTED
280 # define PNG_FP_EXPORT(ordinal, type, name, args)\
281 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
282 # ifndef PNG_VERSION_INFO_ONLY
283 typedef struct png_incomplete png_double;
284 typedef png_double* png_doublep;
285 typedef const png_double* png_const_doublep;
286 typedef png_double** png_doublepp;
287 # endif
288 # endif
289 #endif
290 #ifndef PNG_FIXED_EXPORT
291 # ifndef PNG_FIXED_POINT_SUPPORTED
292 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
293 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
294 # endif
295 #endif
296
297 #include "png.h"
298
299 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
300 #ifndef PNG_DLL_EXPORT
301 # define PNG_DLL_EXPORT
302 #endif
303
304 /* This is a global switch to set the compilation for an installed system
305 * (a release build). It can be set for testing debug builds to ensure that
306 * they will compile when the build type is switched to RC or STABLE, the
307 * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS
308 * with either:
309 *
310 * -DPNG_RELEASE_BUILD Turns on the release compile path
311 * -DPNG_RELEASE_BUILD=0 Turns it off
312 * or in your pngusr.h with
313 * #define PNG_RELEASE_BUILD=1 Turns on the release compile path
314 * #define PNG_RELEASE_BUILD=0 Turns it off
315 */
316 #ifndef PNG_RELEASE_BUILD
317 # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC)
318 #endif
319
320 /* SECURITY and SAFETY:
321 *
322 * libpng is built with support for internal limits on image dimensions and
323 * memory usage. These are documented in scripts/pnglibconf.dfa of the
324 * source and recorded in the machine generated header file pnglibconf.h.
325 */
326
327 /* If you are running on a machine where you cannot allocate more
328 * than 64K of memory at once, uncomment this. While libpng will not
329 * normally need that much memory in a chunk (unless you load up a very
330 * large file), zlib needs to know how big of a chunk it can use, and
331 * libpng thus makes sure to check any memory allocation to verify it
332 * will fit into memory.
333 *
334 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
335 * same limit and pngconf.h (already included) sets the limit
336 * if certain operating systems are detected.
337 */
338 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
339 # define PNG_MAX_MALLOC_64K
340 #endif
341
342 #ifndef PNG_UNUSED
343 /* Unused formal parameter warnings are silenced using the following macro
344 * which is expected to have no bad effects on performance (optimizing
345 * compilers will probably remove it entirely). Note that if you replace
346 * it with something other than whitespace, you must include the terminating
347 * semicolon.
348 */
349 # define PNG_UNUSED(param) (void)param;
350 #endif
351
352 /* Just a little check that someone hasn't tried to define something
353 * contradictory.
354 */
355 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
356 # undef PNG_ZBUF_SIZE
357 # define PNG_ZBUF_SIZE 65536L
358 #endif
359
360 /* If warnings or errors are turned off the code is disabled or redirected here.
361 * From 1.5.4 functions have been added to allow very limited formatting of
362 * error and warning messages - this code will also be disabled here.
363 */
364 #ifdef PNG_WARNINGS_SUPPORTED
365 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
366 #else
367 # define png_warning_parameter(p,number,string) ((void)0)
368 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
369 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
370 # define png_formatted_warning(pp,p,message) ((void)(pp))
371 # define PNG_WARNING_PARAMETERS(p)
372 #endif
373 #ifndef PNG_ERROR_TEXT_SUPPORTED
374 # define png_fixed_error(s1,s2) png_err(s1)
375 #endif
376
377 /* C allows up-casts from (void*) to any pointer and (const void*) to any
378 * pointer to a const object. C++ regards this as a type error and requires an
379 * explicit, static, cast and provides the static_cast<> rune to ensure that
380 * const is not cast away.
381 */
382 #ifdef __cplusplus
383 # define png_voidcast(type, value) static_cast<type>(value)
384 # define png_constcast(type, value) const_cast<type>(value)
385 # define png_aligncast(type, value) \
386 static_cast<type>(static_cast<void*>(value))
387 # define png_aligncastconst(type, value) \
388 static_cast<type>(static_cast<const void*>(value))
389 #else
390 # define png_voidcast(type, value) (value)
391 # define png_constcast(type, value) ((type)(value))
392 # define png_aligncast(type, value) ((void*)(value))
393 # define png_aligncastconst(type, value) ((const void*)(value))
394 #endif /* __cplusplus */
395
396 /* Some fixed point APIs are still required even if not exported because
397 * they get used by the corresponding floating point APIs. This magic
398 * deals with this:
399 */
400 #ifdef PNG_FIXED_POINT_SUPPORTED
401 # define PNGFAPI PNGAPI
402 #else
403 # define PNGFAPI /* PRIVATE */
404 #endif
405
406 #ifndef PNG_VERSION_INFO_ONLY
407 /* Other defines specific to compilers can go here. Try to keep
408 * them inside an appropriate ifdef/endif pair for portability.
409 */
410 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
411 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
412 /* png.c requires the following ANSI-C constants if the conversion of
413 * floating point to ASCII is implemented therein:
414 *
415 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
416 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
417 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
418 */
419 # include <float.h>
420
421 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
422 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
423 /* We need to check that <math.h> hasn't already been included earlier
424 * as it seems it doesn't agree with <fp.h>, yet we should really use
425 * <fp.h> if possible.
426 */
427 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
428 # include <fp.h>
429 # endif
430 # else
431 # include <math.h>
432 # endif
433 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
434 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
435 * MATH=68881
436 */
437 # include <m68881.h>
438 # endif
439 #endif
440
441 /* This provides the non-ANSI (far) memory allocation routines. */
442 #if defined(__TURBOC__) && defined(__MSDOS__)
443 # include <mem.h>
444 # include <alloc.h>
445 #endif
446
447 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
448 defined(_WIN32) || defined(__WIN32__)
449 # define WIN32_NO_STATUS
450 # define WIN32_LEAN_AND_MEAN
451 # include <windows.h> /* defines _WINDOWS_ macro */
452 #endif
453 #endif /* PNG_VERSION_INFO_ONLY */
454
455 /* Moved here around 1.5.0beta36 from pngconf.h */
456 /* Users may want to use these so they are not private. Any library
457 * functions that are passed far data must be model-independent.
458 */
459
460 /* Memory model/platform independent fns */
461 #ifndef PNG_ABORT
462 # ifdef _WINDOWS_
463 # define PNG_ABORT() ExitProcess(0)
464 # else
465 # define PNG_ABORT() abort()
466 # endif
467 #endif
468
469 /* These macros may need to be architecture dependent. */
470 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
471 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
472 #ifdef offsetof
473 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
474 #else
475 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
476 #endif
477 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
478
479 #ifndef PNG_ALIGN_TYPE
480 /* Default to using aligned access optimizations and requiring alignment to a
481 * multiple of the data type size. Override in a compiler specific fashion
482 * if necessary by inserting tests here:
483 */
484 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
485 #endif
486
487 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
488 /* This is used because in some compiler implementations non-aligned
489 * structure members are supported, so the offsetof approach below fails.
490 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
491 * is good for performance. Do not do this unless you have tested the result
492 * and understand it.
493 */
494 # define png_alignof(type) (sizeof (type))
495 #else
496 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
497 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
498 # else
499 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
500 # define png_alignof(type) (1)
501 # endif
502 /* Else leave png_alignof undefined to prevent use thereof */
503 # endif
504 #endif
505
506 /* This implicitly assumes alignment is always to a power of 2. */
507 #ifdef png_alignof
508 # define png_isaligned(ptr, type)\
509 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
510 #else
511 # define png_isaligned(ptr, type) 0
512 #endif
513
514 /* End of memory model/platform independent support */
515 /* End of 1.5.0beta36 move from pngconf.h */
516
517 /* CONSTANTS and UTILITY MACROS
518 * These are used internally by libpng and not exposed in the API
519 */
520
521 /* Various modes of operation. Note that after an init, mode is set to
522 * zero automatically when the structure is created. Three of these
523 * are defined in png.h because they need to be visible to applications
524 * that call png_set_unknown_chunk().
525 */
526 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
527 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
528 #define PNG_HAVE_IDAT 0x04
529 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
530 #define PNG_HAVE_IEND 0x10
531 /* 0x20 (unused) */
532 /* 0x40 (unused) */
533 /* 0x80 (unused) */
534 #define PNG_HAVE_CHUNK_HEADER 0x100
535 #define PNG_WROTE_tIME 0x200
536 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
537 #define PNG_BACKGROUND_IS_GRAY 0x800
538 #define PNG_HAVE_PNG_SIGNATURE 0x1000
539 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
540 /* 0x4000 (unused) */
541 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
542
543 /* Flags for the transformations the PNG library does on the image data */
544 #define PNG_BGR 0x0001
545 #define PNG_INTERLACE 0x0002
546 #define PNG_PACK 0x0004
547 #define PNG_SHIFT 0x0008
548 #define PNG_SWAP_BYTES 0x0010
549 #define PNG_INVERT_MONO 0x0020
550 #define PNG_QUANTIZE 0x0040
551 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
552 #define PNG_BACKGROUND_EXPAND 0x0100
553 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
554 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
555 #define PNG_RGBA 0x0800
556 #define PNG_EXPAND 0x1000
557 #define PNG_GAMMA 0x2000
558 #define PNG_GRAY_TO_RGB 0x4000
559 #define PNG_FILLER 0x8000
560 #define PNG_PACKSWAP 0x10000
561 #define PNG_SWAP_ALPHA 0x20000
562 #define PNG_STRIP_ALPHA 0x40000
563 #define PNG_INVERT_ALPHA 0x80000
564 #define PNG_USER_TRANSFORM 0x100000
565 #define PNG_RGB_TO_GRAY_ERR 0x200000
566 #define PNG_RGB_TO_GRAY_WARN 0x400000
567 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
568 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
569 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
570 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
571 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
572 /* 0x8000000 unused */
573 /* 0x10000000 unused */
574 /* 0x20000000 unused */
575 /* 0x40000000 unused */
576 /* Flags for png_create_struct */
577 #define PNG_STRUCT_PNG 0x0001
578 #define PNG_STRUCT_INFO 0x0002
579
580 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
581 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
582 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
583 /* 0x0004 unused */
584 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
585 /* 0x0010 unused */
586 /* 0x0020 unused */
587 #define PNG_FLAG_ROW_INIT 0x0040
588 #define PNG_FLAG_FILLER_AFTER 0x0080
589 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
590 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
591 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
592 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
593 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
594 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
595 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
596 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
597 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
598 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000
599 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
600 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
601 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
602 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
603 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
604 /* 0x800000 unused */
605 /* 0x1000000 unused */
606 /* 0x2000000 unused */
607 /* 0x4000000 unused */
608 /* 0x8000000 unused */
609 /* 0x10000000 unused */
610 /* 0x20000000 unused */
611 /* 0x40000000 unused */
612
613 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
614 PNG_FLAG_CRC_ANCILLARY_NOWARN)
615
616 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
617 PNG_FLAG_CRC_CRITICAL_IGNORE)
618
619 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
620 PNG_FLAG_CRC_CRITICAL_MASK)
621
622 /* Save typing and make code easier to understand */
623
624 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
625 abs((int)((c1).green) - (int)((c2).green)) + \
626 abs((int)((c1).blue) - (int)((c2).blue)))
627
628 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
629 * by dividing by 257 *with rounding*. This macro is exact for the given range.
630 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
631 * macro were established by experiment (modifying the added value). The macro
632 * has a second variant that takes a value already scaled by 255 and divides by
633 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
634 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
635 */
636 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
637 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
638
639 /* Added to libpng-1.2.6 JB */
640 #define PNG_ROWBYTES(pixel_bits, width) \
641 ((pixel_bits) >= 8 ? \
642 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
643 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
644
645 /* PNG_OUT_OF_RANGE returns true if value is outside the range
646 * ideal-delta..ideal+delta. Each argument is evaluated twice.
647 * "ideal" and "delta" should be constants, normally simple
648 * integers, "value" a variable. Added to libpng-1.2.6 JB
649 */
650 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
651 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
652
653 /* Conversions between fixed and floating point, only defined if
654 * required (to make sure the code doesn't accidentally use float
655 * when it is supposedly disabled.)
656 */
657 #ifdef PNG_FLOATING_POINT_SUPPORTED
658 /* The floating point conversion can't overflow, though it can and
659 * does lose accuracy relative to the original fixed point value.
660 * In practice this doesn't matter because png_fixed_point only
661 * stores numbers with very low precision. The png_ptr and s
662 * arguments are unused by default but are there in case error
663 * checking becomes a requirement.
664 */
665 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
666
667 /* The fixed point conversion performs range checking and evaluates
668 * its argument multiple times, so must be used with care. The
669 * range checking uses the PNG specification values for a signed
670 * 32-bit fixed point value except that the values are deliberately
671 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
672 * (2^31-1) * 100000). 's' is a string that describes the value being
673 * converted.
674 *
675 * NOTE: this macro will raise a png_error if the range check fails,
676 * therefore it is normally only appropriate to use this on values
677 * that come from API calls or other sources where an out of range
678 * error indicates a programming error, not a data error!
679 *
680 * NOTE: by default this is off - the macro is not used - because the
681 * function call saves a lot of code.
682 */
683 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
684 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
685 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
686 #endif
687 /* else the corresponding function is defined below, inside the scope of the
688 * cplusplus test.
689 */
690 #endif
691
692 /* Constants for known chunk types. If you need to add a chunk, define the name
693 * here. For historical reasons these constants have the form png_<name>; i.e.
694 * the prefix is lower case. Please use decimal values as the parameters to
695 * match the ISO PNG specification and to avoid relying on the C locale
696 * interpretation of character values.
697 *
698 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
699 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
700 * to be generated if required.
701 *
702 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
703 * architectures where (int) is only 16 bits.
704 */
705 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
706 #define PNG_U32(b1,b2,b3,b4) \
707 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
708
709 /* Constants for known chunk types.
710 *
711 * MAINTAINERS: If you need to add a chunk, define the name here.
712 * For historical reasons these constants have the form png_<name>; i.e.
713 * the prefix is lower case. Please use decimal values as the parameters to
714 * match the ISO PNG specification and to avoid relying on the C locale
715 * interpretation of character values. Please keep the list sorted.
716 *
717 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
718 * type. In fact the specification does not express chunk types this way,
719 * however using a 32-bit value means that the chunk type can be read from the
720 * stream using exactly the same code as used for a 32-bit unsigned value and
721 * can be examined far more efficiently (using one arithmetic compare).
722 *
723 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
724 * libpng API still uses strings for 'unknown' chunks and a macro,
725 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
726 * that for portable code numeric values must still be used; the string "IHDR"
727 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
728 *
729 * In 1.7.0 the definitions will be made public in png.h to avoid having to
730 * duplicate the same definitions in application code.
731 */
732 #define png_IDAT PNG_U32( 73, 68, 65, 84)
733 #define png_IEND PNG_U32( 73, 69, 78, 68)
734 #define png_IHDR PNG_U32( 73, 72, 68, 82)
735 #define png_PLTE PNG_U32( 80, 76, 84, 69)
736 #define png_bKGD PNG_U32( 98, 75, 71, 68)
737 #define png_cHRM PNG_U32( 99, 72, 82, 77)
738 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
739 #define png_gAMA PNG_U32(103, 65, 77, 65)
740 #define png_gIFg PNG_U32(103, 73, 70, 103)
741 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
742 #define png_gIFx PNG_U32(103, 73, 70, 120)
743 #define png_hIST PNG_U32(104, 73, 83, 84)
744 #define png_iCCP PNG_U32(105, 67, 67, 80)
745 #define png_iTXt PNG_U32(105, 84, 88, 116)
746 #define png_oFFs PNG_U32(111, 70, 70, 115)
747 #define png_pCAL PNG_U32(112, 67, 65, 76)
748 #define png_pHYs PNG_U32(112, 72, 89, 115)
749 #define png_sBIT PNG_U32(115, 66, 73, 84)
750 #define png_sCAL PNG_U32(115, 67, 65, 76)
751 #define png_sPLT PNG_U32(115, 80, 76, 84)
752 #define png_sRGB PNG_U32(115, 82, 71, 66)
753 #define png_sTER PNG_U32(115, 84, 69, 82)
754 #define png_tEXt PNG_U32(116, 69, 88, 116)
755 #define png_tIME PNG_U32(116, 73, 77, 69)
756 #define png_tRNS PNG_U32(116, 82, 78, 83)
757 #define png_zTXt PNG_U32(122, 84, 88, 116)
758
759 /* The following will work on (signed char*) strings, whereas the get_uint_32
760 * macro will fail on top-bit-set values because of the sign extension.
761 */
762 #define PNG_CHUNK_FROM_STRING(s)\
763 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
764
765 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
766 * signed and the argument is a (char[]) This macro will fail miserably on
767 * systems where (char) is more than 8 bits.
768 */
769 #define PNG_STRING_FROM_CHUNK(s,c)\
770 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
771 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
772 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
773 ((char*)(s))[3]=(char)((c & 0xff)))
774
775 /* Do the same but terminate with a null character. */
776 #define PNG_CSTRING_FROM_CHUNK(s,c)\
777 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
778
779 /* Test on flag values as defined in the spec (section 5.4): */
780 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
781 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
782 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
783 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
784 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
785
786 /* Gamma values (new at libpng-1.5.4): */
787 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
788 #define PNG_GAMMA_MAC_INVERSE 65909
789 #define PNG_GAMMA_sRGB_INVERSE 45455
790
791 /* Almost everything below is C specific; the #defines above can be used in
792 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
793 */
794 #ifndef PNG_VERSION_INFO_ONLY
795
796 #include "pngstruct.h"
797 #include "pnginfo.h"
798
799 /* Validate the include paths - the include path used to generate pnglibconf.h
800 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
801 */
802 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
803 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
804 "-I (include path) error: see the notes in pngpriv.h"
805 /* This means that when pnglibconf.h was built the copy of zlib.h that it
806 * used is not the same as the one being used here. Because the build of
807 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
808 * zlib version number and because this affects handling of certain broken
809 * PNG files the -I directives must match.
810 *
811 * The most likely explanation is that you passed a -I in CFLAGS. This will
812 * not work; all the preprocessor directories and in particular all the -I
813 * directives must be in CPPFLAGS.
814 */
815 #endif
816
817 /* This is used for 16-bit gamma tables -- only the top level pointers are
818 * const; this could be changed:
819 */
820 typedef const png_uint_16p * png_const_uint_16pp;
821
822 /* Added to libpng-1.5.7: sRGB conversion tables */
823 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
824 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
825 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
826 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
827 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
828 * 0..65535. This table gives the closest 16-bit answers (no errors).
829 */
830 #endif
831
832 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
833 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
834
835 #define PNG_sRGB_FROM_LINEAR(linear) \
836 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
837 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
838 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
839 * encoded value with maximum error 0.646365. Note that the input is not a
840 * 16-bit value; it has been multiplied by 255! */
841 #endif /* SIMPLIFIED_READ/WRITE */
842
843
844 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
845 #ifdef __cplusplus
846 extern "C" {
847 #endif /* __cplusplus */
848
849 /* Internal functions; these are not exported from a DLL however because they
850 * are used within several of the C source files they have to be C extern.
851 *
852 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
853 */
854
855 /* Zlib support */
856 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
857 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
858 PNG_EMPTY);
859 /* Used by the zlib handling functions to ensure that z_stream::msg is always
860 * set before they return.
861 */
862
863 #ifdef PNG_WRITE_SUPPORTED
864 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
865 png_compression_bufferp *list),PNG_EMPTY);
866 /* Free the buffer list used by the compressed write code. */
867 #endif
868
869 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
870 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
871 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
872 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
873 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
874 (defined(PNG_sCAL_SUPPORTED) && \
875 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
876 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
877 double fp, png_const_charp text),PNG_EMPTY);
878 #endif
879
880 /* Check the user version string for compatibility, returns false if the version
881 * numbers aren't compatible.
882 */
883 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
884 png_const_charp user_png_ver),PNG_EMPTY);
885
886 /* Internal base allocator - no messages, NULL on failure to allocate. This
887 * does, however, call the application provided allocator and that could call
888 * png_error (although that would be a bug in the application implementation.)
889 */
890 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
891 png_alloc_size_t size),PNG_ALLOCATED);
892
893 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
894 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
895 /* Internal array allocator, outputs no error or warning messages on failure,
896 * just returns NULL.
897 */
898 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
899 int nelements, size_t element_size),PNG_ALLOCATED);
900
901 /* The same but an existing array is extended by add_elements. This function
902 * also memsets the new elements to 0 and copies the old elements. The old
903 * array is not freed or altered.
904 */
905 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
906 png_const_voidp array, int old_elements, int add_elements,
907 size_t element_size),PNG_ALLOCATED);
908 #endif /* text, sPLT or unknown chunks */
909
910 /* Magic to create a struct when there is no struct to call the user supplied
911 * memory allocators. Because error handling has not been set up the memory
912 * handlers can't safely call png_error, but this is an obscure and undocumented
913 * restriction so libpng has to assume that the 'free' handler, at least, might
914 * call png_error.
915 */
916 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
917 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
918 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
919 png_free_ptr free_fn),PNG_ALLOCATED);
920
921 /* Free memory from internal libpng struct */
922 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
923 PNG_EMPTY);
924
925 /* Free an allocated jmp_buf (always succeeds) */
926 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
927
928 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
929 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
930 PNG_ALLOCATED);
931
932 /* Function to free memory for zlib. PNGAPI is disallowed. */
933 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
934
935 /* Next four functions are used internally as callbacks. PNGCBAPI is required
936 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
937 * PNGCBAPI at 1.5.0
938 */
939
940 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
941 png_bytep data, png_size_t length),PNG_EMPTY);
942
943 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
944 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
945 png_bytep buffer, png_size_t length),PNG_EMPTY);
946 #endif
947
948 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
949 png_bytep data, png_size_t length),PNG_EMPTY);
950
951 #ifdef PNG_WRITE_FLUSH_SUPPORTED
952 # ifdef PNG_STDIO_SUPPORTED
953 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
954 PNG_EMPTY);
955 # endif
956 #endif
957
958 /* Reset the CRC variable */
959 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
960
961 /* Write the "data" buffer to whatever output you are using */
962 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
963 png_const_bytep data, png_size_t length),PNG_EMPTY);
964
965 /* Read and check the PNG file signature */
966 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
967 png_inforp info_ptr),PNG_EMPTY);
968
969 /* Read the chunk header (length + type name) */
970 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
971 PNG_EMPTY);
972
973 /* Read data from whatever input you are using into the "data" buffer */
974 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
975 png_size_t length),PNG_EMPTY);
976
977 /* Read bytes into buf, and update png_ptr->crc */
978 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
979 png_uint_32 length),PNG_EMPTY);
980
981 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
982 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
983 png_uint_32 skip),PNG_EMPTY);
984
985 /* Read the CRC from the file and compare it to the libpng calculated CRC */
986 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
987
988 /* Calculate the CRC over a section of data. Note that we are only
989 * passing a maximum of 64K on systems that have this as a memory limit,
990 * since this is the maximum buffer size we can specify.
991 */
992 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
993 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
994
995 #ifdef PNG_WRITE_FLUSH_SUPPORTED
996 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
997 #endif
998
999 /* Write various chunks */
1000
1001 /* Write the IHDR chunk, and update the png_struct with the necessary
1002 * information.
1003 */
1004 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1005 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1006 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1007
1008 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1009 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1010
1011 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1012 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1013 PNG_EMPTY);
1014
1015 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1016
1017 #ifdef PNG_WRITE_gAMA_SUPPORTED
1018 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1019 png_fixed_point file_gamma),PNG_EMPTY);
1020 #endif
1021
1022 #ifdef PNG_WRITE_sBIT_SUPPORTED
1023 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1024 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1025 #endif
1026
1027 #ifdef PNG_WRITE_cHRM_SUPPORTED
1028 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1029 const png_xy *xy), PNG_EMPTY);
1030 /* The xy value must have been previously validated */
1031 #endif
1032
1033 #ifdef PNG_WRITE_sRGB_SUPPORTED
1034 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1035 int intent),PNG_EMPTY);
1036 #endif
1037
1038 #ifdef PNG_WRITE_iCCP_SUPPORTED
1039 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1040 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1041 /* The profile must have been previously validated for correctness, the
1042 * length comes from the first four bytes. Only the base, deflate,
1043 * compression is supported.
1044 */
1045 #endif
1046
1047 #ifdef PNG_WRITE_sPLT_SUPPORTED
1048 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1049 png_const_sPLT_tp palette),PNG_EMPTY);
1050 #endif
1051
1052 #ifdef PNG_WRITE_tRNS_SUPPORTED
1053 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1054 png_const_bytep trans, png_const_color_16p values, int number,
1055 int color_type),PNG_EMPTY);
1056 #endif
1057
1058 #ifdef PNG_WRITE_bKGD_SUPPORTED
1059 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1060 png_const_color_16p values, int color_type),PNG_EMPTY);
1061 #endif
1062
1063 #ifdef PNG_WRITE_hIST_SUPPORTED
1064 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1065 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1066 #endif
1067
1068 /* Chunks that have keywords */
1069 #ifdef PNG_WRITE_tEXt_SUPPORTED
1070 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1071 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
1072 #endif
1073
1074 #ifdef PNG_WRITE_zTXt_SUPPORTED
1075 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1076 key, png_const_charp text, int compression),PNG_EMPTY);
1077 #endif
1078
1079 #ifdef PNG_WRITE_iTXt_SUPPORTED
1080 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1081 int compression, png_const_charp key, png_const_charp lang,
1082 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1083 #endif
1084
1085 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1086 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1087 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1088 #endif
1089
1090 #ifdef PNG_WRITE_oFFs_SUPPORTED
1091 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1092 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1093 #endif
1094
1095 #ifdef PNG_WRITE_pCAL_SUPPORTED
1096 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1097 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1098 png_const_charp units, png_charpp params),PNG_EMPTY);
1099 #endif
1100
1101 #ifdef PNG_WRITE_pHYs_SUPPORTED
1102 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1103 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1104 int unit_type),PNG_EMPTY);
1105 #endif
1106
1107 #ifdef PNG_WRITE_tIME_SUPPORTED
1108 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1109 png_const_timep mod_time),PNG_EMPTY);
1110 #endif
1111
1112 #ifdef PNG_WRITE_sCAL_SUPPORTED
1113 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1114 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1115 #endif
1116
1117 /* Called when finished processing a row of data */
1118 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1119 PNG_EMPTY);
1120
1121 /* Internal use only. Called before first row of data */
1122 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1123 PNG_EMPTY);
1124
1125 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1126 * array of png_ptr->width pixels. If the image is not interlaced or this
1127 * is the final pass this just does a memcpy, otherwise the "display" flag
1128 * is used to determine whether to copy pixels that are not in the current pass.
1129 *
1130 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1131 * function to achieve the documented 'blocky' appearance during interlaced read
1132 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1133 * are not changed if they are not in the current pass, when display is 0.
1134 *
1135 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1136 *
1137 * The API always reads from the png_struct row buffer and always assumes that
1138 * it is full width (png_do_read_interlace has already been called.)
1139 *
1140 * This function is only ever used to write to row buffers provided by the
1141 * caller of the relevant libpng API and the row must have already been
1142 * transformed by the read transformations.
1143 *
1144 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1145 * bitmasks for use within the code, otherwise runtime generated masks are used.
1146 * The default is compile time masks.
1147 */
1148 #ifndef PNG_USE_COMPILE_TIME_MASKS
1149 # define PNG_USE_COMPILE_TIME_MASKS 1
1150 #endif
1151 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1152 png_bytep row, int display),PNG_EMPTY);
1153
1154 #ifdef PNG_READ_INTERLACING_SUPPORTED
1155 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1156 * been read in and must correspond to the pixels in 'row', the pixels are
1157 * expanded (moved apart) in 'row' to match the final layout, when doing this
1158 * the pixels are *replicated* to the intervening space. This is essential for
1159 * the correct operation of png_combine_row, above.
1160 */
1161 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1162 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1163 #endif
1164
1165 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1166
1167 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1168 /* Grab pixels out of a row for an interlaced pass */
1169 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1170 png_bytep row, int pass),PNG_EMPTY);
1171 #endif
1172
1173 /* Unfilter a row: check the filter value before calling this, there is no point
1174 * calling it for PNG_FILTER_VALUE_NONE.
1175 */
1176 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1177 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1178
1179 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1180 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1181 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1182 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1183 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1184 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1185 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1186 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1187 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1188 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1189 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1190 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1191 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1192 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1193
1194 /* Choose the best filter to use and filter the row data */
1195 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1196 png_row_infop row_info),PNG_EMPTY);
1197
1198 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1199 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1200 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1201 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1202 * is NULL the function checks, instead, for the end of the stream. In this
1203 * case a benign error will be issued if the stream end is not found or if
1204 * extra data has to be consumed.
1205 */
1206 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1207 PNG_EMPTY);
1208 /* This cleans up when the IDAT LZ stream does not end when the last image
1209 * byte is read; there is still some pending input.
1210 */
1211
1212 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1213 PNG_EMPTY);
1214 /* Finish a row while reading, dealing with interlacing passes, etc. */
1215 #endif /* SEQUENTIAL_READ */
1216
1217 /* Initialize the row buffers, etc. */
1218 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1219
1220 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1221 /* Optional call to update the users info structure */
1222 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1223 png_inforp info_ptr),PNG_EMPTY);
1224 #endif
1225
1226 /* Shared transform functions, defined in pngtran.c */
1227 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1228 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1229 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1230 png_bytep row, int at_start),PNG_EMPTY);
1231 #endif
1232
1233 #ifdef PNG_16BIT_SUPPORTED
1234 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1235 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1236 png_bytep row),PNG_EMPTY);
1237 #endif
1238 #endif
1239
1240 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1241 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1242 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1243 png_bytep row),PNG_EMPTY);
1244 #endif
1245
1246 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1247 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1248 png_bytep row),PNG_EMPTY);
1249 #endif
1250
1251 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1252 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1253 png_bytep row),PNG_EMPTY);
1254 #endif
1255
1256 /* The following decodes the appropriate chunks, and does error correction,
1257 * then calls the appropriate callback for the chunk if it is valid.
1258 */
1259
1260 /* Decode the IHDR chunk */
1261 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1262 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1263 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1264 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1265 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1266 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1267
1268 #ifdef PNG_READ_bKGD_SUPPORTED
1269 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1270 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1271 #endif
1272
1273 #ifdef PNG_READ_cHRM_SUPPORTED
1274 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1275 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1276 #endif
1277
1278 #ifdef PNG_READ_gAMA_SUPPORTED
1279 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1280 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1281 #endif
1282
1283 #ifdef PNG_READ_hIST_SUPPORTED
1284 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1285 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1286 #endif
1287
1288 #ifdef PNG_READ_iCCP_SUPPORTED
1289 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1290 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1291 #endif /* READ_iCCP */
1292
1293 #ifdef PNG_READ_iTXt_SUPPORTED
1294 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1295 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1296 #endif
1297
1298 #ifdef PNG_READ_oFFs_SUPPORTED
1299 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1300 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1301 #endif
1302
1303 #ifdef PNG_READ_pCAL_SUPPORTED
1304 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1305 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1306 #endif
1307
1308 #ifdef PNG_READ_pHYs_SUPPORTED
1309 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1310 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1311 #endif
1312
1313 #ifdef PNG_READ_sBIT_SUPPORTED
1314 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1315 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1316 #endif
1317
1318 #ifdef PNG_READ_sCAL_SUPPORTED
1319 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1320 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1321 #endif
1322
1323 #ifdef PNG_READ_sPLT_SUPPORTED
1324 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1325 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1326 #endif /* READ_sPLT */
1327
1328 #ifdef PNG_READ_sRGB_SUPPORTED
1329 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1330 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1331 #endif
1332
1333 #ifdef PNG_READ_tEXt_SUPPORTED
1334 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1335 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1336 #endif
1337
1338 #ifdef PNG_READ_tIME_SUPPORTED
1339 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1340 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1341 #endif
1342
1343 #ifdef PNG_READ_tRNS_SUPPORTED
1344 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1345 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1346 #endif
1347
1348 #ifdef PNG_READ_zTXt_SUPPORTED
1349 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1350 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1351 #endif
1352
1353 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1354 png_uint_32 chunk_name),PNG_EMPTY);
1355
1356 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1357 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1358 /* This is the function that gets called for unknown chunks. The 'keep'
1359 * argument is either non-zero for a known chunk that has been set to be
1360 * handled as unknown or zero for an unknown chunk. By default the function
1361 * just skips the chunk or errors out if it is critical.
1362 */
1363
1364 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1365 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1366 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1367 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1368 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1369 * 32-bit chunk name, not a string.
1370 */
1371 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1372
1373 /* Handle the transformations for reading and writing */
1374 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1375 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1376 png_row_infop row_info),PNG_EMPTY);
1377 #endif
1378 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1379 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1380 png_row_infop row_info),PNG_EMPTY);
1381 #endif
1382
1383 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1384 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1385 PNG_EMPTY);
1386 #endif
1387
1388 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1389 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1390 png_inforp info_ptr),PNG_EMPTY);
1391 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1392 png_inforp info_ptr),PNG_EMPTY);
1393 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1394 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1395 PNG_EMPTY);
1396 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1397 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1398 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1399 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1400 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1401 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1402 PNG_EMPTY);
1403 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1404 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1405 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1406 png_inforp info_ptr),PNG_EMPTY);
1407 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1408 png_inforp info_ptr),PNG_EMPTY);
1409 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1410 png_bytep row),PNG_EMPTY);
1411 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1412 png_inforp info_ptr),PNG_EMPTY);
1413 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1414 png_inforp info_ptr),PNG_EMPTY);
1415 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1416 PNG_EMPTY);
1417 # ifdef PNG_READ_tEXt_SUPPORTED
1418 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1419 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1420 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1421 png_inforp info_ptr),PNG_EMPTY);
1422 # endif
1423 # ifdef PNG_READ_zTXt_SUPPORTED
1424 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1425 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1426 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1427 png_inforp info_ptr),PNG_EMPTY);
1428 # endif
1429 # ifdef PNG_READ_iTXt_SUPPORTED
1430 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1431 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1432 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1433 png_inforp info_ptr),PNG_EMPTY);
1434 # endif
1435
1436 #endif /* PROGRESSIVE_READ */
1437
1438 /* Added at libpng version 1.6.0 */
1439 #ifdef PNG_GAMMA_SUPPORTED
1440 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1441 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1442 /* Set the colorspace gamma with a value provided by the application or by
1443 * the gAMA chunk on read. The value will override anything set by an ICC
1444 * profile.
1445 */
1446
1447 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1448 png_inforp info_ptr), PNG_EMPTY);
1449 /* Synchronize the info 'valid' flags with the colorspace */
1450
1451 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1452 png_inforp info_ptr), PNG_EMPTY);
1453 /* Copy the png_struct colorspace to the info_struct and call the above to
1454 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1455 */
1456 #endif
1457
1458 /* Added at libpng version 1.4.0 */
1459 #ifdef PNG_COLORSPACE_SUPPORTED
1460 /* These internal functions are for maintaining the colorspace structure within
1461 * a png_info or png_struct (or, indeed, both).
1462 */
1463 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1464 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1465 int preferred), PNG_EMPTY);
1466
1467 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1468 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1469 int preferred), PNG_EMPTY);
1470
1471 #ifdef PNG_sRGB_SUPPORTED
1472 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1473 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1474 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1475 * flags to write them, if it returns false there was a problem and an error
1476 * message has already been output (but the colorspace may still need to be
1477 * synced to record the invalid flag).
1478 */
1479 #endif /* sRGB */
1480
1481 #ifdef PNG_iCCP_SUPPORTED
1482 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1483 png_colorspacerp colorspace, png_const_charp name,
1484 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1485 PNG_EMPTY);
1486 /* The 'name' is used for information only */
1487
1488 /* Routines for checking parts of an ICC profile. */
1489 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1490 png_colorspacerp colorspace, png_const_charp name,
1491 png_uint_32 profile_length), PNG_EMPTY);
1492 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1493 png_colorspacerp colorspace, png_const_charp name,
1494 png_uint_32 profile_length,
1495 png_const_bytep profile /* first 132 bytes only */, int color_type),
1496 PNG_EMPTY);
1497 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1498 png_colorspacerp colorspace, png_const_charp name,
1499 png_uint_32 profile_length,
1500 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1501 #ifdef PNG_sRGB_SUPPORTED
1502 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1503 png_const_structrp png_ptr, png_colorspacerp colorspace,
1504 png_const_bytep profile, uLong adler), PNG_EMPTY);
1505 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1506 * be zero to indicate that it is not available. It is used, if provided,
1507 * as a fast check on the profile when checking to see if it is sRGB.
1508 */
1509 #endif
1510 #endif /* iCCP */
1511
1512 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1513 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1514 (png_structrp png_ptr), PNG_EMPTY);
1515 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1516 #endif /* READ_RGB_TO_GRAY */
1517 #endif /* COLORSPACE */
1518
1519 /* Added at libpng version 1.4.0 */
1520 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1521 png_uint_32 width, png_uint_32 height, int bit_depth,
1522 int color_type, int interlace_type, int compression_type,
1523 int filter_type),PNG_EMPTY);
1524
1525 /* Added at libpng version 1.5.10 */
1526 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1527 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1528 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1529 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1530 #endif
1531
1532 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1533 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1534 png_const_charp name),PNG_NORETURN);
1535 #endif
1536
1537 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1538 * the end. Always leaves the buffer nul terminated. Never errors out (and
1539 * there is no error code.)
1540 */
1541 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1542 size_t pos, png_const_charp string),PNG_EMPTY);
1543
1544 /* Various internal functions to handle formatted warning messages, currently
1545 * only implemented for warnings.
1546 */
1547 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1548 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1549 * and end pointer (which should point just *beyond* the end of the buffer!)
1550 * Returns the pointer to the start of the formatted string. This utility only
1551 * does unsigned values.
1552 */
1553 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1554 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1555
1556 /* Convenience macro that takes an array: */
1557 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1558 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1559
1560 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1561 #define PNG_NUMBER_BUFFER_SIZE 24
1562
1563 /* These are the integer formats currently supported, the name is formed from
1564 * the standard printf(3) format string.
1565 */
1566 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1567 #define PNG_NUMBER_FORMAT_02u 2
1568 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1569 #define PNG_NUMBER_FORMAT_02d 2
1570 #define PNG_NUMBER_FORMAT_x 3
1571 #define PNG_NUMBER_FORMAT_02x 4
1572 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1573 #endif
1574
1575 #ifdef PNG_WARNINGS_SUPPORTED
1576 /* New defines and members adding in libpng-1.5.4 */
1577 # define PNG_WARNING_PARAMETER_SIZE 32
1578 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1579
1580 /* An l-value of this type has to be passed to the APIs below to cache the
1581 * values of the parameters to a formatted warning message.
1582 */
1583 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1584 PNG_WARNING_PARAMETER_SIZE];
1585
1586 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1587 int number, png_const_charp string),PNG_EMPTY);
1588 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1589 * including the trailing '\0'.
1590 */
1591 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1592 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1593 PNG_EMPTY);
1594 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1595 * need to output. Use the following for a signed value.
1596 */
1597 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1598 (png_warning_parameters p, int number, int format, png_int_32 value),
1599 PNG_EMPTY);
1600
1601 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1602 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1603 /* 'message' follows the X/Open approach of using @1, @2 to insert
1604 * parameters previously supplied using the above functions. Errors in
1605 * specifying the parameters will simply result in garbage substitutions.
1606 */
1607 #endif
1608
1609 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1610 /* Application errors (new in 1.6); use these functions (declared below) for
1611 * errors in the parameters or order of API function calls on read. The
1612 * 'warning' should be used for an error that can be handled completely; the
1613 * 'error' for one which can be handled safely but which may lose application
1614 * information or settings.
1615 *
1616 * By default these both result in a png_error call prior to release, while in a
1617 * released version the 'warning' is just a warning. However if the application
1618 * explicitly disables benign errors (explicitly permitting the code to lose
1619 * information) they both turn into warnings.
1620 *
1621 * If benign errors aren't supported they end up as the corresponding base call
1622 * (png_warning or png_error.)
1623 */
1624 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1625 png_const_charp message),PNG_EMPTY);
1626 /* The application provided invalid parameters to an API function or called
1627 * an API function at the wrong time, libpng can completely recover.
1628 */
1629
1630 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1631 png_const_charp message),PNG_EMPTY);
1632 /* As above but libpng will ignore the call, or attempt some other partial
1633 * recovery from the error.
1634 */
1635 #else
1636 # define png_app_warning(pp,s) png_warning(pp,s)
1637 # define png_app_error(pp,s) png_error(pp,s)
1638 #endif
1639
1640 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1641 png_const_charp message, int error),PNG_EMPTY);
1642 /* Report a recoverable issue in chunk data. On read this is used to report
1643 * a problem found while reading a particular chunk and the
1644 * png_chunk_benign_error or png_chunk_warning function is used as
1645 * appropriate. On write this is used to report an error that comes from
1646 * data set via an application call to a png_set_ API and png_app_error or
1647 * png_app_warning is used as appropriate.
1648 *
1649 * The 'error' parameter must have one of the following values:
1650 */
1651 #define PNG_CHUNK_WARNING 0 /* never an error */
1652 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1653 #define PNG_CHUNK_ERROR 2 /* always an error */
1654
1655 /* ASCII to FP interfaces, currently only implemented if sCAL
1656 * support is required.
1657 */
1658 #if defined(PNG_sCAL_SUPPORTED)
1659 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1660 * width or height, derived from the precision (number of significant
1661 * digits - a build time settable option) and assumptions about the
1662 * maximum ridiculous exponent.
1663 */
1664 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1665
1666 #ifdef PNG_FLOATING_POINT_SUPPORTED
1667 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1668 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1669 PNG_EMPTY);
1670 #endif /* FLOATING_POINT */
1671
1672 #ifdef PNG_FIXED_POINT_SUPPORTED
1673 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1674 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
1675 #endif /* FIXED_POINT */
1676 #endif /* sCAL */
1677
1678 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1679 /* An internal API to validate the format of a floating point number.
1680 * The result is the index of the next character. If the number is
1681 * not valid it will be the index of a character in the supposed number.
1682 *
1683 * The format of a number is defined in the PNG extensions specification
1684 * and this API is strictly conformant to that spec, not anyone elses!
1685 *
1686 * The format as a regular expression is:
1687 *
1688 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1689 *
1690 * or:
1691 *
1692 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1693 *
1694 * The complexity is that either integer or fraction must be present and the
1695 * fraction is permitted to have no digits only if the integer is present.
1696 *
1697 * NOTE: The dangling E problem.
1698 * There is a PNG valid floating point number in the following:
1699 *
1700 * PNG floating point numbers are not greedy.
1701 *
1702 * Working this out requires *TWO* character lookahead (because of the
1703 * sign), the parser does not do this - it will fail at the 'r' - this
1704 * doesn't matter for PNG sCAL chunk values, but it requires more care
1705 * if the value were ever to be embedded in something more complex. Use
1706 * ANSI-C strtod if you need the lookahead.
1707 */
1708 /* State table for the parser. */
1709 #define PNG_FP_INTEGER 0 /* before or in integer */
1710 #define PNG_FP_FRACTION 1 /* before or in fraction */
1711 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1712 #define PNG_FP_STATE 3 /* mask for the above */
1713 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1714 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1715 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1716 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1717 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1718
1719 /* These three values don't affect the parser. They are set but not used.
1720 */
1721 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1722 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1723 #define PNG_FP_NONZERO 256 /* A non-zero value */
1724 #define PNG_FP_STICKY 448 /* The above three flags */
1725
1726 /* This is available for the caller to store in 'state' if required. Do not
1727 * call the parser after setting it (the parser sometimes clears it.)
1728 */
1729 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1730
1731 /* Result codes for the parser (boolean - true meants ok, false means
1732 * not ok yet.)
1733 */
1734 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1735 #define PNG_FP_OK 1 /* The number is valid */
1736
1737 /* Tests on the sticky non-zero and negative flags. To pass these checks
1738 * the state must also indicate that the whole number is valid - this is
1739 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1740 * is equivalent to PNG_FP_OK above.)
1741 */
1742 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1743 /* NZ_MASK: the string is valid and a non-zero negative value */
1744 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1745 /* Z MASK: the string is valid and a non-zero value. */
1746 /* PNG_FP_SAW_DIGIT: the string is valid. */
1747 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1748 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1749 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1750
1751 /* The actual parser. This can be called repeatedly. It updates
1752 * the index into the string and the state variable (which must
1753 * be initialized to 0). It returns a result code, as above. There
1754 * is no point calling the parser any more if it fails to advance to
1755 * the end of the string - it is stuck on an invalid character (or
1756 * terminated by '\0').
1757 *
1758 * Note that the pointer will consume an E or even an E+ and then leave
1759 * a 'maybe' state even though a preceding integer.fraction is valid.
1760 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1761 * a valid number. It's possible to recover from this by calling
1762 * the parser again (from the start, with state 0) but with a string
1763 * that omits the last character (i.e. set the size to the index of
1764 * the problem character.) This has not been tested within libpng.
1765 */
1766 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1767 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1768
1769 /* This is the same but it checks a complete string and returns true
1770 * only if it just contains a floating point number. As of 1.5.4 this
1771 * function also returns the state at the end of parsing the number if
1772 * it was valid (otherwise it returns 0.) This can be used for testing
1773 * for negative or zero values using the sticky flag.
1774 */
1775 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1776 png_size_t size),PNG_EMPTY);
1777 #endif /* pCAL || sCAL */
1778
1779 #if defined(PNG_GAMMA_SUPPORTED) ||\
1780 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1781 /* Added at libpng version 1.5.0 */
1782 /* This is a utility to provide a*times/div (rounded) and indicate
1783 * if there is an overflow. The result is a boolean - false (0)
1784 * for overflow, true (1) if no overflow, in which case *res
1785 * holds the result.
1786 */
1787 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1788 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1789 #endif
1790
1791 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1792 /* Same deal, but issue a warning on overflow and return 0. */
1793 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1794 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1795 png_int_32 divided_by),PNG_EMPTY);
1796 #endif
1797
1798 #ifdef PNG_GAMMA_SUPPORTED
1799 /* Calculate a reciprocal - used for gamma values. This returns
1800 * 0 if the argument is 0 in order to maintain an undefined value;
1801 * there are no warnings.
1802 */
1803 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1804 PNG_EMPTY);
1805
1806 #ifdef PNG_READ_GAMMA_SUPPORTED
1807 /* The same but gives a reciprocal of the product of two fixed point
1808 * values. Accuracy is suitable for gamma calculations but this is
1809 * not exact - use png_muldiv for that. Only required at present on read.
1810 */
1811 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1812 png_fixed_point b),PNG_EMPTY);
1813 #endif
1814
1815 /* Return true if the gamma value is significantly different from 1.0 */
1816 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1817 PNG_EMPTY);
1818 #endif
1819
1820 #ifdef PNG_READ_GAMMA_SUPPORTED
1821 /* Internal fixed point gamma correction. These APIs are called as
1822 * required to convert single values - they don't need to be fast,
1823 * they are not used when processing image pixel values.
1824 *
1825 * While the input is an 'unsigned' value it must actually be the
1826 * correct bit value - 0..255 or 0..65535 as required.
1827 */
1828 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1829 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1830 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1831 png_fixed_point gamma_value),PNG_EMPTY);
1832 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1833 png_fixed_point gamma_value),PNG_EMPTY);
1834 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1835 PNG_EMPTY);
1836 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1837 int bit_depth),PNG_EMPTY);
1838 #endif
1839
1840 /* SIMPLIFIED READ/WRITE SUPPORT */
1841 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
1842 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
1843 /* The internal structure that png_image::opaque points to. */
1844 typedef struct png_control
1845 {
1846 png_structp png_ptr;
1847 png_infop info_ptr;
1848 png_voidp error_buf; /* Always a jmp_buf at present. */
1849
1850 png_const_bytep memory; /* Memory buffer. */
1851 png_size_t size; /* Size of the memory buffer. */
1852
1853 unsigned int for_write :1; /* Otherwise it is a read structure */
1854 unsigned int owned_file :1; /* We own the file in io_ptr */
1855 } png_control;
1856
1857 /* Return the pointer to the jmp_buf from a png_control: necessary because C
1858 * does not reveal the type of the elements of jmp_buf.
1859 */
1860 #ifdef __cplusplus
1861 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1862 #else
1863 # define png_control_jmp_buf(pc) ((pc)->error_buf)
1864 #endif
1865
1866 /* Utility to safely execute a piece of libpng code catching and logging any
1867 * errors that might occur. Returns true on success, false on failure (either
1868 * of the function or as a result of a png_error.)
1869 */
1870 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
1871 png_const_charp error_message),PNG_NORETURN);
1872
1873 #ifdef PNG_WARNINGS_SUPPORTED
1874 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
1875 png_const_charp warning_message),PNG_EMPTY);
1876 #else
1877 # define png_safe_warning 0/*dummy argument*/
1878 #endif
1879
1880 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
1881 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
1882
1883 /* Utility to log an error; this also cleans up the png_image; the function
1884 * always returns 0 (false).
1885 */
1886 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
1887 png_const_charp error_message),PNG_EMPTY);
1888
1889 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
1890 /* png_image_free is used by the write code but not exported */
1891 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
1892 #endif /* !SIMPLIFIED_READ */
1893
1894 #endif /* SIMPLIFIED READ/WRITE */
1895
1896 /* These are initialization functions for hardware specific PNG filter
1897 * optimizations; list these here then select the appropriate one at compile
1898 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
1899 * the generic code is used.
1900 */
1901 #ifdef PNG_FILTER_OPTIMIZATIONS
1902 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
1903 unsigned int bpp), PNG_EMPTY);
1904 /* Just declare the optimization that will be used */
1905 #else
1906 /* List *all* the possible optimizations here - this branch is required if
1907 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
1908 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
1909 */
1910 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
1911 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
1912 #endif
1913
1914 /* Maintainer: Put new private prototypes here ^ */
1915
1916 #include "pngdebug.h"
1917
1918 #ifdef __cplusplus
1919 }
1920 #endif
1921
1922 #endif /* PNG_VERSION_INFO_ONLY */
1923 #endif /* PNGPRIV_H */