src/third-party/libpng/pngpriv.h (view raw)
1
2/* pngpriv.h - private declarations for use inside libpng
3 *
4 * Last changed in libpng 1.6.17 [March 26, 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 __ARM_NEON__, so we
122 * check both variants.
123 */
124# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \
125 defined(PNG_ALIGNED_MEMORY_SUPPORTED)
126# define PNG_ARM_NEON_OPT 2
127# else
128# define PNG_ARM_NEON_OPT 0
129# endif
130#endif
131
132#if PNG_ARM_NEON_OPT > 0
133 /* NEON optimizations are to be at least considered by libpng, so enable the
134 * callbacks to do this.
135 */
136# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
137
138 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
139 * if possible - if __ARM_NEON__ is set and the compiler version is not known
140 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
141 * be:
142 *
143 * 1 The intrinsics code (the default with __ARM_NEON__)
144 * 2 The hand coded assembler (the default without __ARM_NEON__)
145 *
146 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
147 * this is *NOT* supported and may cease to work even after a minor revision
148 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
149 * testing or a new compiler, but the results should be communicated to the
150 * libpng implementation list for incorporation in the next minor release.
151 */
152# ifndef PNG_ARM_NEON_IMPLEMENTATION
153# if defined(__ARM_NEON__) || defined(__ARM_NEON)
154# if defined(__clang__)
155 /* At present it is unknown by the libpng developers which versions
156 * of clang support the intrinsics, however some or perhaps all
157 * versions do not work with the assembler so this may be
158 * irrelevant, so just use the default (do nothing here.)
159 */
160# elif defined(__GNUC__)
161 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
162 * work, so if this *is* GCC, or G++, look for a version >4.5
163 */
164# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
165# define PNG_ARM_NEON_IMPLEMENTATION 2
166# endif /* no GNUC support */
167# endif /* __GNUC__ */
168# else /* !defined __ARM_NEON__ */
169 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
170 */
171# define PNG_ARM_NEON_IMPLEMENTATION 2
172# endif /* __ARM_NEON__ */
173# endif /* !PNG_ARM_NEON_IMPLEMENTATION */
174
175# ifndef PNG_ARM_NEON_IMPLEMENTATION
176 /* Use the intrinsics code by default. */
177# define PNG_ARM_NEON_IMPLEMENTATION 1
178# endif
179#endif /* PNG_ARM_NEON_OPT > 0 */
180
181/* Is this a build of a DLL where compilation of the object modules requires
182 * different preprocessor settings to those required for a simple library? If
183 * so PNG_BUILD_DLL must be set.
184 *
185 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
186 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
187 * static library of libpng then link the DLL against that.
188 */
189#ifndef PNG_BUILD_DLL
190# ifdef DLL_EXPORT
191 /* This is set by libtool when files are compiled for a DLL; libtool
192 * always compiles twice, even on systems where it isn't necessary. Set
193 * PNG_BUILD_DLL in case it is necessary:
194 */
195# define PNG_BUILD_DLL
196# else
197# ifdef _WINDLL
198 /* This is set by the Microsoft Visual Studio IDE in projects that
199 * build a DLL. It can't easily be removed from those projects (it
200 * isn't visible in the Visual Studio UI) so it is a fairly reliable
201 * indication that PNG_IMPEXP needs to be set to the DLL export
202 * attributes.
203 */
204# define PNG_BUILD_DLL
205# else
206# ifdef __DLL__
207 /* This is set by the Borland C system when compiling for a DLL
208 * (as above.)
209 */
210# define PNG_BUILD_DLL
211# else
212 /* Add additional compiler cases here. */
213# endif
214# endif
215# endif
216#endif /* Setting PNG_BUILD_DLL if required */
217
218/* See pngconf.h for more details: the builder of the library may set this on
219 * the command line to the right thing for the specific compilation system or it
220 * may be automagically set above (at present we know of no system where it does
221 * need to be set on the command line.)
222 *
223 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
224 * setting it to the "import" setting for a DLL build.
225 */
226#ifndef PNG_IMPEXP
227# ifdef PNG_BUILD_DLL
228# define PNG_IMPEXP PNG_DLL_EXPORT
229# else
230 /* Not building a DLL, or the DLL doesn't require specific export
231 * definitions.
232 */
233# define PNG_IMPEXP
234# endif
235#endif
236
237/* No warnings for private or deprecated functions in the build: */
238#ifndef PNG_DEPRECATED
239# define PNG_DEPRECATED
240#endif
241#ifndef PNG_PRIVATE
242# define PNG_PRIVATE
243#endif
244
245/* Symbol preprocessing support.
246 *
247 * To enable listing global, but internal, symbols the following macros should
248 * always be used to declare an extern data or function object in this file.
249 */
250#ifndef PNG_INTERNAL_DATA
251# define PNG_INTERNAL_DATA(type, name, array) extern type name array
252#endif
253
254#ifndef PNG_INTERNAL_FUNCTION
255# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
256 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
257#endif
258
259#ifndef PNG_INTERNAL_CALLBACK
260# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
261 extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes)
262#endif
263
264/* If floating or fixed point APIs are disabled they may still be compiled
265 * internally. To handle this make sure they are declared as the appropriate
266 * internal extern function (otherwise the symbol prefixing stuff won't work and
267 * the functions will be used without definitions.)
268 *
269 * NOTE: although all the API functions are declared here they are not all
270 * actually built! Because the declarations are still made it is necessary to
271 * fake out types that they depend on.
272 */
273#ifndef PNG_FP_EXPORT
274# ifndef PNG_FLOATING_POINT_SUPPORTED
275# define PNG_FP_EXPORT(ordinal, type, name, args)\
276 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
277# ifndef PNG_VERSION_INFO_ONLY
278 typedef struct png_incomplete png_double;
279 typedef png_double* png_doublep;
280 typedef const png_double* png_const_doublep;
281 typedef png_double** png_doublepp;
282# endif
283# endif
284#endif
285#ifndef PNG_FIXED_EXPORT
286# ifndef PNG_FIXED_POINT_SUPPORTED
287# define PNG_FIXED_EXPORT(ordinal, type, name, args)\
288 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
289# endif
290#endif
291
292#include "png.h"
293
294/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
295#ifndef PNG_DLL_EXPORT
296# define PNG_DLL_EXPORT
297#endif
298
299/* SECURITY and SAFETY:
300 *
301 * libpng is built with support for internal limits on image dimensions and
302 * memory usage. These are documented in scripts/pnglibconf.dfa of the
303 * source and recorded in the machine generated header file pnglibconf.h.
304 */
305
306/* If you are running on a machine where you cannot allocate more
307 * than 64K of memory at once, uncomment this. While libpng will not
308 * normally need that much memory in a chunk (unless you load up a very
309 * large file), zlib needs to know how big of a chunk it can use, and
310 * libpng thus makes sure to check any memory allocation to verify it
311 * will fit into memory.
312 *
313 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
314 * same limit and pngconf.h (already included) sets the limit
315 * if certain operating systems are detected.
316 */
317#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
318# define PNG_MAX_MALLOC_64K
319#endif
320
321#ifndef PNG_UNUSED
322/* Unused formal parameter warnings are silenced using the following macro
323 * which is expected to have no bad effects on performance (optimizing
324 * compilers will probably remove it entirely). Note that if you replace
325 * it with something other than whitespace, you must include the terminating
326 * semicolon.
327 */
328# define PNG_UNUSED(param) (void)param;
329#endif
330
331/* Just a little check that someone hasn't tried to define something
332 * contradictory.
333 */
334#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
335# undef PNG_ZBUF_SIZE
336# define PNG_ZBUF_SIZE 65536L
337#endif
338
339/* If warnings or errors are turned off the code is disabled or redirected here.
340 * From 1.5.4 functions have been added to allow very limited formatting of
341 * error and warning messages - this code will also be disabled here.
342 */
343#ifdef PNG_WARNINGS_SUPPORTED
344# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
345#else
346# define png_warning_parameter(p,number,string) ((void)0)
347# define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
348# define png_warning_parameter_signed(p,number,format,value) ((void)0)
349# define png_formatted_warning(pp,p,message) ((void)(pp))
350# define PNG_WARNING_PARAMETERS(p)
351#endif
352#ifndef PNG_ERROR_TEXT_SUPPORTED
353# define png_fixed_error(s1,s2) png_err(s1)
354#endif
355
356/* C allows up-casts from (void*) to any pointer and (const void*) to any
357 * pointer to a const object. C++ regards this as a type error and requires an
358 * explicit, static, cast and provides the static_cast<> rune to ensure that
359 * const is not cast away.
360 */
361#ifdef __cplusplus
362# define png_voidcast(type, value) static_cast<type>(value)
363# define png_constcast(type, value) const_cast<type>(value)
364# define png_aligncast(type, value) \
365 static_cast<type>(static_cast<void*>(value))
366# define png_aligncastconst(type, value) \
367 static_cast<type>(static_cast<const void*>(value))
368#else
369# define png_voidcast(type, value) (value)
370# define png_constcast(type, value) ((type)(value))
371# define png_aligncast(type, value) ((void*)(value))
372# define png_aligncastconst(type, value) ((const void*)(value))
373#endif /* __cplusplus */
374
375/* Some fixed point APIs are still required even if not exported because
376 * they get used by the corresponding floating point APIs. This magic
377 * deals with this:
378 */
379#ifdef PNG_FIXED_POINT_SUPPORTED
380# define PNGFAPI PNGAPI
381#else
382# define PNGFAPI /* PRIVATE */
383#endif
384
385#ifndef PNG_VERSION_INFO_ONLY
386/* Other defines specific to compilers can go here. Try to keep
387 * them inside an appropriate ifdef/endif pair for portability.
388 */
389#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
390 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
391 /* png.c requires the following ANSI-C constants if the conversion of
392 * floating point to ASCII is implemented therein:
393 *
394 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
395 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
396 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
397 */
398# include <float.h>
399
400# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
401 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
402 /* We need to check that <math.h> hasn't already been included earlier
403 * as it seems it doesn't agree with <fp.h>, yet we should really use
404 * <fp.h> if possible.
405 */
406# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
407# include <fp.h>
408# endif
409# else
410# include <math.h>
411# endif
412# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
413 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
414 * MATH=68881
415 */
416# include <m68881.h>
417# endif
418#endif
419
420/* This provides the non-ANSI (far) memory allocation routines. */
421#if defined(__TURBOC__) && defined(__MSDOS__)
422# include <mem.h>
423# include <alloc.h>
424#endif
425
426#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
427 defined(_WIN32) || defined(__WIN32__)
428# include <windows.h> /* defines _WINDOWS_ macro */
429#endif
430#endif /* PNG_VERSION_INFO_ONLY */
431
432/* Moved here around 1.5.0beta36 from pngconf.h */
433/* Users may want to use these so they are not private. Any library
434 * functions that are passed far data must be model-independent.
435 */
436
437/* Memory model/platform independent fns */
438#ifndef PNG_ABORT
439# ifdef _WINDOWS_
440# define PNG_ABORT() ExitProcess(0)
441# else
442# define PNG_ABORT() abort()
443# endif
444#endif
445
446/* These macros may need to be architecture dependent. */
447#define PNG_ALIGN_NONE 0 /* do not use data alignment */
448#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
449#ifdef offsetof
450# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
451#else
452# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
453#endif
454#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
455
456#ifndef PNG_ALIGN_TYPE
457 /* Default to using aligned access optimizations and requiring alignment to a
458 * multiple of the data type size. Override in a compiler specific fashion
459 * if necessary by inserting tests here:
460 */
461# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
462#endif
463
464#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
465 /* This is used because in some compiler implementations non-aligned
466 * structure members are supported, so the offsetof approach below fails.
467 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
468 * is good for performance. Do not do this unless you have tested the result
469 * and understand it.
470 */
471# define png_alignof(type) (sizeof (type))
472#else
473# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
474# define png_alignof(type) offsetof(struct{char c; type t;}, t)
475# else
476# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
477# define png_alignof(type) (1)
478# endif
479 /* Else leave png_alignof undefined to prevent use thereof */
480# endif
481#endif
482
483/* This implicitly assumes alignment is always to a power of 2. */
484#ifdef png_alignof
485# define png_isaligned(ptr, type)\
486 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
487#else
488# define png_isaligned(ptr, type) 0
489#endif
490
491/* End of memory model/platform independent support */
492/* End of 1.5.0beta36 move from pngconf.h */
493
494/* CONSTANTS and UTILITY MACROS
495 * These are used internally by libpng and not exposed in the API
496 */
497
498/* Various modes of operation. Note that after an init, mode is set to
499 * zero automatically when the structure is created. Three of these
500 * are defined in png.h because they need to be visible to applications
501 * that call png_set_unknown_chunk().
502 */
503/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
504/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
505#define PNG_HAVE_IDAT 0x04
506/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
507#define PNG_HAVE_IEND 0x10
508 /* 0x20 (unused) */
509 /* 0x40 (unused) */
510 /* 0x80 (unused) */
511#define PNG_HAVE_CHUNK_HEADER 0x100
512#define PNG_WROTE_tIME 0x200
513#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
514#define PNG_BACKGROUND_IS_GRAY 0x800
515#define PNG_HAVE_PNG_SIGNATURE 0x1000
516#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
517 /* 0x4000 (unused) */
518#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
519
520/* Flags for the transformations the PNG library does on the image data */
521#define PNG_BGR 0x0001
522#define PNG_INTERLACE 0x0002
523#define PNG_PACK 0x0004
524#define PNG_SHIFT 0x0008
525#define PNG_SWAP_BYTES 0x0010
526#define PNG_INVERT_MONO 0x0020
527#define PNG_QUANTIZE 0x0040
528#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
529#define PNG_BACKGROUND_EXPAND 0x0100
530#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
531#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
532#define PNG_RGBA 0x0800
533#define PNG_EXPAND 0x1000
534#define PNG_GAMMA 0x2000
535#define PNG_GRAY_TO_RGB 0x4000
536#define PNG_FILLER 0x8000
537#define PNG_PACKSWAP 0x10000
538#define PNG_SWAP_ALPHA 0x20000
539#define PNG_STRIP_ALPHA 0x40000
540#define PNG_INVERT_ALPHA 0x80000
541#define PNG_USER_TRANSFORM 0x100000
542#define PNG_RGB_TO_GRAY_ERR 0x200000
543#define PNG_RGB_TO_GRAY_WARN 0x400000
544#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
545#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
546#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
547#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
548#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
549 /* 0x8000000 unused */
550 /* 0x10000000 unused */
551 /* 0x20000000 unused */
552 /* 0x40000000 unused */
553/* Flags for png_create_struct */
554#define PNG_STRUCT_PNG 0x0001
555#define PNG_STRUCT_INFO 0x0002
556
557/* Scaling factor for filter heuristic weighting calculations */
558#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
559#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
560
561/* Flags for the png_ptr->flags rather than declaring a byte for each one */
562#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
563#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
564 /* 0x0004 unused */
565#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
566 /* 0x0010 unused */
567 /* 0x0020 unused */
568#define PNG_FLAG_ROW_INIT 0x0040
569#define PNG_FLAG_FILLER_AFTER 0x0080
570#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
571#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
572#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
573#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
574#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
575#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
576#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
577/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
578/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
579#define PNG_FLAG_LIBRARY_MISMATCH 0x20000
580#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
581#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
582#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
583#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
584#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
585 /* 0x800000 unused */
586 /* 0x1000000 unused */
587 /* 0x2000000 unused */
588 /* 0x4000000 unused */
589 /* 0x8000000 unused */
590 /* 0x10000000 unused */
591 /* 0x20000000 unused */
592 /* 0x40000000 unused */
593
594#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
595 PNG_FLAG_CRC_ANCILLARY_NOWARN)
596
597#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
598 PNG_FLAG_CRC_CRITICAL_IGNORE)
599
600#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
601 PNG_FLAG_CRC_CRITICAL_MASK)
602
603/* Save typing and make code easier to understand */
604
605#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
606 abs((int)((c1).green) - (int)((c2).green)) + \
607 abs((int)((c1).blue) - (int)((c2).blue)))
608
609/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
610 * by dividing by 257 *with rounding*. This macro is exact for the given range.
611 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
612 * macro were established by experiment (modifying the added value). The macro
613 * has a second variant that takes a value already scaled by 255 and divides by
614 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
615 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
616 */
617#define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
618#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
619
620/* Added to libpng-1.2.6 JB */
621#define PNG_ROWBYTES(pixel_bits, width) \
622 ((pixel_bits) >= 8 ? \
623 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
624 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
625
626/* PNG_OUT_OF_RANGE returns true if value is outside the range
627 * ideal-delta..ideal+delta. Each argument is evaluated twice.
628 * "ideal" and "delta" should be constants, normally simple
629 * integers, "value" a variable. Added to libpng-1.2.6 JB
630 */
631#define PNG_OUT_OF_RANGE(value, ideal, delta) \
632 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
633
634/* Conversions between fixed and floating point, only defined if
635 * required (to make sure the code doesn't accidentally use float
636 * when it is supposedly disabled.)
637 */
638#ifdef PNG_FLOATING_POINT_SUPPORTED
639/* The floating point conversion can't overflow, though it can and
640 * does lose accuracy relative to the original fixed point value.
641 * In practice this doesn't matter because png_fixed_point only
642 * stores numbers with very low precision. The png_ptr and s
643 * arguments are unused by default but are there in case error
644 * checking becomes a requirement.
645 */
646#define png_float(png_ptr, fixed, s) (.00001 * (fixed))
647
648/* The fixed point conversion performs range checking and evaluates
649 * its argument multiple times, so must be used with care. The
650 * range checking uses the PNG specification values for a signed
651 * 32 bit fixed point value except that the values are deliberately
652 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
653 * (2^31-1) * 100000). 's' is a string that describes the value being
654 * converted.
655 *
656 * NOTE: this macro will raise a png_error if the range check fails,
657 * therefore it is normally only appropriate to use this on values
658 * that come from API calls or other sources where an out of range
659 * error indicates a programming error, not a data error!
660 *
661 * NOTE: by default this is off - the macro is not used - because the
662 * function call saves a lot of code.
663 */
664#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
665#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
666 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
667#endif
668/* else the corresponding function is defined below, inside the scope of the
669 * cplusplus test.
670 */
671#endif
672
673/* Constants for known chunk types. If you need to add a chunk, define the name
674 * here. For historical reasons these constants have the form png_<name>; i.e.
675 * the prefix is lower case. Please use decimal values as the parameters to
676 * match the ISO PNG specification and to avoid relying on the C locale
677 * interpretation of character values.
678 *
679 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
680 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
681 * to be generated if required.
682 *
683 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
684 * architectures where (int) is only 16 bits.
685 */
686#define PNG_32b(b,s) ((png_uint_32)(b) << (s))
687#define PNG_U32(b1,b2,b3,b4) \
688 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
689
690/* Constants for known chunk types.
691 *
692 * MAINTAINERS: If you need to add a chunk, define the name here.
693 * 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. Please keep the list sorted.
697 *
698 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
699 * type. In fact the specification does not express chunk types this way,
700 * however using a 32-bit value means that the chunk type can be read from the
701 * stream using exactly the same code as used for a 32-bit unsigned value and
702 * can be examined far more efficiently (using one arithmetic compare).
703 *
704 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
705 * libpng API still uses strings for 'unknown' chunks and a macro,
706 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
707 * that for portable code numeric values must still be used; the string "IHDR"
708 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
709 *
710 * In 1.7.0 the definitions will be made public in png.h to avoid having to
711 * duplicate the same definitions in application code.
712 */
713#define png_IDAT PNG_U32( 73, 68, 65, 84)
714#define png_IEND PNG_U32( 73, 69, 78, 68)
715#define png_IHDR PNG_U32( 73, 72, 68, 82)
716#define png_PLTE PNG_U32( 80, 76, 84, 69)
717#define png_bKGD PNG_U32( 98, 75, 71, 68)
718#define png_cHRM PNG_U32( 99, 72, 82, 77)
719#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
720#define png_gAMA PNG_U32(103, 65, 77, 65)
721#define png_gIFg PNG_U32(103, 73, 70, 103)
722#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
723#define png_gIFx PNG_U32(103, 73, 70, 120)
724#define png_hIST PNG_U32(104, 73, 83, 84)
725#define png_iCCP PNG_U32(105, 67, 67, 80)
726#define png_iTXt PNG_U32(105, 84, 88, 116)
727#define png_oFFs PNG_U32(111, 70, 70, 115)
728#define png_pCAL PNG_U32(112, 67, 65, 76)
729#define png_pHYs PNG_U32(112, 72, 89, 115)
730#define png_sBIT PNG_U32(115, 66, 73, 84)
731#define png_sCAL PNG_U32(115, 67, 65, 76)
732#define png_sPLT PNG_U32(115, 80, 76, 84)
733#define png_sRGB PNG_U32(115, 82, 71, 66)
734#define png_sTER PNG_U32(115, 84, 69, 82)
735#define png_tEXt PNG_U32(116, 69, 88, 116)
736#define png_tIME PNG_U32(116, 73, 77, 69)
737#define png_tRNS PNG_U32(116, 82, 78, 83)
738#define png_zTXt PNG_U32(122, 84, 88, 116)
739
740/* The following will work on (signed char*) strings, whereas the get_uint_32
741 * macro will fail on top-bit-set values because of the sign extension.
742 */
743#define PNG_CHUNK_FROM_STRING(s)\
744 PNG_U32(0xff & (s)[0], 0xff & (s)[1], 0xff & (s)[2], 0xff & (s)[3])
745
746/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
747 * signed and the argument is a (char[]) This macro will fail miserably on
748 * systems where (char) is more than 8 bits.
749 */
750#define PNG_STRING_FROM_CHUNK(s,c)\
751 (void)(((char*)(s))[0]=(char)(((c)>>24) & 0xff), \
752 ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\
753 ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \
754 ((char*)(s))[3]=(char)((c & 0xff)))
755
756/* Do the same but terminate with a null character. */
757#define PNG_CSTRING_FROM_CHUNK(s,c)\
758 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
759
760/* Test on flag values as defined in the spec (section 5.4): */
761#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
762#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
763#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
764#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
765#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
766
767/* Gamma values (new at libpng-1.5.4): */
768#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
769#define PNG_GAMMA_MAC_INVERSE 65909
770#define PNG_GAMMA_sRGB_INVERSE 45455
771
772/* Almost everything below is C specific; the #defines above can be used in
773 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
774 */
775#ifndef PNG_VERSION_INFO_ONLY
776
777#include "pngstruct.h"
778#include "pnginfo.h"
779
780/* Validate the include paths - the include path used to generate pnglibconf.h
781 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
782 */
783#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
784# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
785 "-I (include path) error: see the notes in pngpriv.h"
786 /* This means that when pnglibconf.h was built the copy of zlib.h that it
787 * used is not the same as the one being used here. Because the build of
788 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
789 * zlib version number and because this affects handling of certain broken
790 * PNG files the -I directives must match.
791 *
792 * The most likely explanation is that you passed a -I in CFLAGS. This will
793 * not work; all the preprocessor directories and in particular all the -I
794 * directives must be in CPPFLAGS.
795 */
796#endif
797
798/* This is used for 16 bit gamma tables -- only the top level pointers are
799 * const; this could be changed:
800 */
801typedef const png_uint_16p * png_const_uint_16pp;
802
803/* Added to libpng-1.5.7: sRGB conversion tables */
804#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
805 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
806#ifdef PNG_SIMPLIFIED_READ_SUPPORTED
807PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
808 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
809 * 0..65535. This table gives the closest 16-bit answers (no errors).
810 */
811#endif
812
813PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
814PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
815
816#define PNG_sRGB_FROM_LINEAR(linear) \
817 ((png_byte)(0xff & ((png_sRGB_base[(linear)>>15] \
818 + ((((linear) & 0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)))
819 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
820 * encoded value with maximum error 0.646365. Note that the input is not a
821 * 16-bit value; it has been multiplied by 255! */
822#endif /* SIMPLIFIED_READ/WRITE */
823
824
825/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
826#ifdef __cplusplus
827extern "C" {
828#endif /* __cplusplus */
829
830/* Internal functions; these are not exported from a DLL however because they
831 * are used within several of the C source files they have to be C extern.
832 *
833 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
834 */
835
836/* Zlib support */
837#define PNG_UNEXPECTED_ZLIB_RETURN (-7)
838PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
839 PNG_EMPTY);
840 /* Used by the zlib handling functions to ensure that z_stream::msg is always
841 * set before they return.
842 */
843
844#ifdef PNG_WRITE_SUPPORTED
845PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
846 png_compression_bufferp *list),PNG_EMPTY);
847 /* Free the buffer list used by the compressed write code. */
848#endif
849
850#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
851 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
852 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
853 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
854 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
855 (defined(PNG_sCAL_SUPPORTED) && \
856 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
857PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
858 double fp, png_const_charp text),PNG_EMPTY);
859#endif
860
861/* Check the user version string for compatibility, returns false if the version
862 * numbers aren't compatible.
863 */
864PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
865 png_const_charp user_png_ver),PNG_EMPTY);
866
867/* Internal base allocator - no messages, NULL on failure to allocate. This
868 * does, however, call the application provided allocator and that could call
869 * png_error (although that would be a bug in the application implementation.)
870 */
871PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
872 png_alloc_size_t size),PNG_ALLOCATED);
873
874#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
875 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
876/* Internal array allocator, outputs no error or warning messages on failure,
877 * just returns NULL.
878 */
879PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
880 int nelements, size_t element_size),PNG_ALLOCATED);
881
882/* The same but an existing array is extended by add_elements. This function
883 * also memsets the new elements to 0 and copies the old elements. The old
884 * array is not freed or altered.
885 */
886PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
887 png_const_voidp array, int old_elements, int add_elements,
888 size_t element_size),PNG_ALLOCATED);
889#endif /* text, sPLT or unknown chunks */
890
891/* Magic to create a struct when there is no struct to call the user supplied
892 * memory allocators. Because error handling has not been set up the memory
893 * handlers can't safely call png_error, but this is an obscure and undocumented
894 * restriction so libpng has to assume that the 'free' handler, at least, might
895 * call png_error.
896 */
897PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
898 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
899 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
900 png_free_ptr free_fn),PNG_ALLOCATED);
901
902/* Free memory from internal libpng struct */
903PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
904 PNG_EMPTY);
905
906/* Free an allocated jmp_buf (always succeeds) */
907PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
908
909/* Function to allocate memory for zlib. PNGAPI is disallowed. */
910PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
911 PNG_ALLOCATED);
912
913/* Function to free memory for zlib. PNGAPI is disallowed. */
914PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
915
916/* Next four functions are used internally as callbacks. PNGCBAPI is required
917 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
918 * PNGCBAPI at 1.5.0
919 */
920
921PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
922 png_bytep data, png_size_t length),PNG_EMPTY);
923
924#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
925PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
926 png_bytep buffer, png_size_t length),PNG_EMPTY);
927#endif
928
929PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
930 png_bytep data, png_size_t length),PNG_EMPTY);
931
932#ifdef PNG_WRITE_FLUSH_SUPPORTED
933# ifdef PNG_STDIO_SUPPORTED
934PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
935 PNG_EMPTY);
936# endif
937#endif
938
939/* Reset the CRC variable */
940PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
941
942/* Write the "data" buffer to whatever output you are using */
943PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
944 png_const_bytep data, png_size_t length),PNG_EMPTY);
945
946/* Read and check the PNG file signature */
947PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
948 png_inforp info_ptr),PNG_EMPTY);
949
950/* Read the chunk header (length + type name) */
951PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
952 PNG_EMPTY);
953
954/* Read data from whatever input you are using into the "data" buffer */
955PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
956 png_size_t length),PNG_EMPTY);
957
958/* Read bytes into buf, and update png_ptr->crc */
959PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
960 png_uint_32 length),PNG_EMPTY);
961
962/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
963PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
964 png_uint_32 skip),PNG_EMPTY);
965
966/* Read the CRC from the file and compare it to the libpng calculated CRC */
967PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
968
969/* Calculate the CRC over a section of data. Note that we are only
970 * passing a maximum of 64K on systems that have this as a memory limit,
971 * since this is the maximum buffer size we can specify.
972 */
973PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
974 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
975
976#ifdef PNG_WRITE_FLUSH_SUPPORTED
977PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
978#endif
979
980/* Write various chunks */
981
982/* Write the IHDR chunk, and update the png_struct with the necessary
983 * information.
984 */
985PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
986 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
987 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
988
989PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
990 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
991
992PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
993 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
994 PNG_EMPTY);
995
996PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
997
998#ifdef PNG_WRITE_gAMA_SUPPORTED
999PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1000 png_fixed_point file_gamma),PNG_EMPTY);
1001#endif
1002
1003#ifdef PNG_WRITE_sBIT_SUPPORTED
1004PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1005 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1006#endif
1007
1008#ifdef PNG_WRITE_cHRM_SUPPORTED
1009PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1010 const png_xy *xy), PNG_EMPTY);
1011 /* The xy value must have been previously validated */
1012#endif
1013
1014#ifdef PNG_WRITE_sRGB_SUPPORTED
1015PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1016 int intent),PNG_EMPTY);
1017#endif
1018
1019#ifdef PNG_WRITE_iCCP_SUPPORTED
1020PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1021 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1022 /* The profile must have been previously validated for correctness, the
1023 * length comes from the first four bytes. Only the base, deflate,
1024 * compression is supported.
1025 */
1026#endif
1027
1028#ifdef PNG_WRITE_sPLT_SUPPORTED
1029PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1030 png_const_sPLT_tp palette),PNG_EMPTY);
1031#endif
1032
1033#ifdef PNG_WRITE_tRNS_SUPPORTED
1034PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1035 png_const_bytep trans, png_const_color_16p values, int number,
1036 int color_type),PNG_EMPTY);
1037#endif
1038
1039#ifdef PNG_WRITE_bKGD_SUPPORTED
1040PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1041 png_const_color_16p values, int color_type),PNG_EMPTY);
1042#endif
1043
1044#ifdef PNG_WRITE_hIST_SUPPORTED
1045PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1046 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1047#endif
1048
1049/* Chunks that have keywords */
1050#ifdef PNG_WRITE_tEXt_SUPPORTED
1051PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1052 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
1053#endif
1054
1055#ifdef PNG_WRITE_zTXt_SUPPORTED
1056PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1057 key, png_const_charp text, int compression),PNG_EMPTY);
1058#endif
1059
1060#ifdef PNG_WRITE_iTXt_SUPPORTED
1061PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1062 int compression, png_const_charp key, png_const_charp lang,
1063 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1064#endif
1065
1066#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1067PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1068 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1069#endif
1070
1071#ifdef PNG_WRITE_oFFs_SUPPORTED
1072PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1073 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1074#endif
1075
1076#ifdef PNG_WRITE_pCAL_SUPPORTED
1077PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1078 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1079 png_const_charp units, png_charpp params),PNG_EMPTY);
1080#endif
1081
1082#ifdef PNG_WRITE_pHYs_SUPPORTED
1083PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1084 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1085 int unit_type),PNG_EMPTY);
1086#endif
1087
1088#ifdef PNG_WRITE_tIME_SUPPORTED
1089PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1090 png_const_timep mod_time),PNG_EMPTY);
1091#endif
1092
1093#ifdef PNG_WRITE_sCAL_SUPPORTED
1094PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1095 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1096#endif
1097
1098/* Called when finished processing a row of data */
1099PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1100 PNG_EMPTY);
1101
1102/* Internal use only. Called before first row of data */
1103PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1104 PNG_EMPTY);
1105
1106/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1107 * array of png_ptr->width pixels. If the image is not interlaced or this
1108 * is the final pass this just does a memcpy, otherwise the "display" flag
1109 * is used to determine whether to copy pixels that are not in the current pass.
1110 *
1111 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1112 * function to achieve the documented 'blocky' appearance during interlaced read
1113 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1114 * are not changed if they are not in the current pass, when display is 0.
1115 *
1116 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1117 *
1118 * The API always reads from the png_struct row buffer and always assumes that
1119 * it is full width (png_do_read_interlace has already been called.)
1120 *
1121 * This function is only ever used to write to row buffers provided by the
1122 * caller of the relevant libpng API and the row must have already been
1123 * transformed by the read transformations.
1124 *
1125 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1126 * bitmasks for use within the code, otherwise runtime generated masks are used.
1127 * The default is compile time masks.
1128 */
1129#ifndef PNG_USE_COMPILE_TIME_MASKS
1130# define PNG_USE_COMPILE_TIME_MASKS 1
1131#endif
1132PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1133 png_bytep row, int display),PNG_EMPTY);
1134
1135#ifdef PNG_READ_INTERLACING_SUPPORTED
1136/* Expand an interlaced row: the 'row_info' describes the pass data that has
1137 * been read in and must correspond to the pixels in 'row', the pixels are
1138 * expanded (moved apart) in 'row' to match the final layout, when doing this
1139 * the pixels are *replicated* to the intervening space. This is essential for
1140 * the correct operation of png_combine_row, above.
1141 */
1142PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1143 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1144#endif
1145
1146/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1147
1148#ifdef PNG_WRITE_INTERLACING_SUPPORTED
1149/* Grab pixels out of a row for an interlaced pass */
1150PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1151 png_bytep row, int pass),PNG_EMPTY);
1152#endif
1153
1154/* Unfilter a row: check the filter value before calling this, there is no point
1155 * calling it for PNG_FILTER_VALUE_NONE.
1156 */
1157PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1158 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1159
1160PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1161 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1162PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
1163 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1164PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
1165 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1166PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
1167 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1168PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1169 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1170PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1171 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1172PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1173 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1174
1175/* Choose the best filter to use and filter the row data */
1176PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1177 png_row_infop row_info),PNG_EMPTY);
1178
1179#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1180PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1181 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1182 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1183 * is NULL the function checks, instead, for the end of the stream. In this
1184 * case a benign error will be issued if the stream end is not found or if
1185 * extra data has to be consumed.
1186 */
1187PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1188 PNG_EMPTY);
1189 /* This cleans up when the IDAT LZ stream does not end when the last image
1190 * byte is read; there is still some pending input.
1191 */
1192
1193PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1194 PNG_EMPTY);
1195 /* Finish a row while reading, dealing with interlacing passes, etc. */
1196#endif /* SEQUENTIAL_READ */
1197
1198/* Initialize the row buffers, etc. */
1199PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1200
1201#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1202/* Optional call to update the users info structure */
1203PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1204 png_inforp info_ptr),PNG_EMPTY);
1205#endif
1206
1207/* Shared transform functions, defined in pngtran.c */
1208#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1209 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1210PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1211 png_bytep row, int at_start),PNG_EMPTY);
1212#endif
1213
1214#ifdef PNG_16BIT_SUPPORTED
1215#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1216PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1217 png_bytep row),PNG_EMPTY);
1218#endif
1219#endif
1220
1221#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1222 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1223PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1224 png_bytep row),PNG_EMPTY);
1225#endif
1226
1227#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1228PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1229 png_bytep row),PNG_EMPTY);
1230#endif
1231
1232#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1233PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1234 png_bytep row),PNG_EMPTY);
1235#endif
1236
1237/* The following decodes the appropriate chunks, and does error correction,
1238 * then calls the appropriate callback for the chunk if it is valid.
1239 */
1240
1241/* Decode the IHDR chunk */
1242PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1243 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1244PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1245 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1246PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1247 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1248
1249#ifdef PNG_READ_bKGD_SUPPORTED
1250PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1251 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1252#endif
1253
1254#ifdef PNG_READ_cHRM_SUPPORTED
1255PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1256 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1257#endif
1258
1259#ifdef PNG_READ_gAMA_SUPPORTED
1260PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1261 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1262#endif
1263
1264#ifdef PNG_READ_hIST_SUPPORTED
1265PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1266 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1267#endif
1268
1269#ifdef PNG_READ_iCCP_SUPPORTED
1270PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1271 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1272#endif /* READ_iCCP */
1273
1274#ifdef PNG_READ_iTXt_SUPPORTED
1275PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1276 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1277#endif
1278
1279#ifdef PNG_READ_oFFs_SUPPORTED
1280PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1281 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1282#endif
1283
1284#ifdef PNG_READ_pCAL_SUPPORTED
1285PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1286 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1287#endif
1288
1289#ifdef PNG_READ_pHYs_SUPPORTED
1290PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1291 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1292#endif
1293
1294#ifdef PNG_READ_sBIT_SUPPORTED
1295PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1296 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1297#endif
1298
1299#ifdef PNG_READ_sCAL_SUPPORTED
1300PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1301 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1302#endif
1303
1304#ifdef PNG_READ_sPLT_SUPPORTED
1305PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1306 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1307#endif /* READ_sPLT */
1308
1309#ifdef PNG_READ_sRGB_SUPPORTED
1310PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1311 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1312#endif
1313
1314#ifdef PNG_READ_tEXt_SUPPORTED
1315PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1316 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1317#endif
1318
1319#ifdef PNG_READ_tIME_SUPPORTED
1320PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1321 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1322#endif
1323
1324#ifdef PNG_READ_tRNS_SUPPORTED
1325PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1326 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1327#endif
1328
1329#ifdef PNG_READ_zTXt_SUPPORTED
1330PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1331 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1332#endif
1333
1334PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1335 png_uint_32 chunk_name),PNG_EMPTY);
1336
1337PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1338 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1339 /* This is the function that gets called for unknown chunks. The 'keep'
1340 * argument is either non-zero for a known chunk that has been set to be
1341 * handled as unknown or zero for an unknown chunk. By default the function
1342 * just skips the chunk or errors out if it is critical.
1343 */
1344
1345#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1346 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1347PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1348 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1349 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1350 * 32-bit chunk name, not a string.
1351 */
1352#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1353
1354/* Handle the transformations for reading and writing */
1355#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1356PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1357 png_row_infop row_info),PNG_EMPTY);
1358#endif
1359#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1360PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1361 png_row_infop row_info),PNG_EMPTY);
1362#endif
1363
1364#ifdef PNG_READ_TRANSFORMS_SUPPORTED
1365PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1366 PNG_EMPTY);
1367#endif
1368
1369#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1370PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1371 png_inforp info_ptr),PNG_EMPTY);
1372PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1373 png_inforp info_ptr),PNG_EMPTY);
1374PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1375PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
1376 png_uint_32 length),PNG_EMPTY);
1377PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
1378 PNG_EMPTY);
1379PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1380 PNG_EMPTY);
1381PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1382 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1383PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1384PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1385 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1386PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1387 PNG_EMPTY);
1388PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1389 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1390PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1391 png_inforp info_ptr),PNG_EMPTY);
1392PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1393 png_inforp info_ptr),PNG_EMPTY);
1394PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1395 png_bytep row),PNG_EMPTY);
1396PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1397 png_inforp info_ptr),PNG_EMPTY);
1398PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1399 png_inforp info_ptr),PNG_EMPTY);
1400PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1401 PNG_EMPTY);
1402# ifdef PNG_READ_tEXt_SUPPORTED
1403PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1404 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1405PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1406 png_inforp info_ptr),PNG_EMPTY);
1407# endif
1408# ifdef PNG_READ_zTXt_SUPPORTED
1409PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1410 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1411PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1412 png_inforp info_ptr),PNG_EMPTY);
1413# endif
1414# ifdef PNG_READ_iTXt_SUPPORTED
1415PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1416 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1417PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1418 png_inforp info_ptr),PNG_EMPTY);
1419# endif
1420
1421#endif /* PROGRESSIVE_READ */
1422
1423/* Added at libpng version 1.6.0 */
1424#ifdef PNG_GAMMA_SUPPORTED
1425PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1426 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1427 /* Set the colorspace gamma with a value provided by the application or by
1428 * the gAMA chunk on read. The value will override anything set by an ICC
1429 * profile.
1430 */
1431
1432PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1433 png_inforp info_ptr), PNG_EMPTY);
1434 /* Synchronize the info 'valid' flags with the colorspace */
1435
1436PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1437 png_inforp info_ptr), PNG_EMPTY);
1438 /* Copy the png_struct colorspace to the info_struct and call the above to
1439 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1440 */
1441#endif
1442
1443/* Added at libpng version 1.4.0 */
1444#ifdef PNG_COLORSPACE_SUPPORTED
1445/* These internal functions are for maintaining the colorspace structure within
1446 * a png_info or png_struct (or, indeed, both).
1447 */
1448PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1449 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1450 int preferred), PNG_EMPTY);
1451
1452PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1453 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1454 int preferred), PNG_EMPTY);
1455
1456#ifdef PNG_sRGB_SUPPORTED
1457PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1458 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1459 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1460 * flags to write them, if it returns false there was a problem and an error
1461 * message has already been output (but the colorspace may still need to be
1462 * synced to record the invalid flag).
1463 */
1464#endif /* sRGB */
1465
1466#ifdef PNG_iCCP_SUPPORTED
1467PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1468 png_colorspacerp colorspace, png_const_charp name,
1469 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1470 PNG_EMPTY);
1471 /* The 'name' is used for information only */
1472
1473/* Routines for checking parts of an ICC profile. */
1474PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1475 png_colorspacerp colorspace, png_const_charp name,
1476 png_uint_32 profile_length), PNG_EMPTY);
1477PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1478 png_colorspacerp colorspace, png_const_charp name,
1479 png_uint_32 profile_length,
1480 png_const_bytep profile /* first 132 bytes only */, int color_type),
1481 PNG_EMPTY);
1482PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1483 png_colorspacerp colorspace, png_const_charp name,
1484 png_uint_32 profile_length,
1485 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1486#ifdef PNG_sRGB_SUPPORTED
1487PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1488 png_const_structrp png_ptr, png_colorspacerp colorspace,
1489 png_const_bytep profile, uLong adler), PNG_EMPTY);
1490 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1491 * be zero to indicate that it is not available. It is used, if provided,
1492 * as a fast check on the profile when checking to see if it is sRGB.
1493 */
1494#endif
1495#endif /* iCCP */
1496
1497#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1498PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1499 (png_structrp png_ptr), PNG_EMPTY);
1500 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1501#endif /* READ_RGB_TO_GRAY */
1502#endif /* COLORSPACE */
1503
1504/* Added at libpng version 1.4.0 */
1505PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1506 png_uint_32 width, png_uint_32 height, int bit_depth,
1507 int color_type, int interlace_type, int compression_type,
1508 int filter_type),PNG_EMPTY);
1509
1510/* Added at libpng version 1.5.10 */
1511#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1512 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1513PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1514 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1515#endif
1516
1517#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1518PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1519 png_const_charp name),PNG_NORETURN);
1520#endif
1521
1522/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1523 * the end. Always leaves the buffer nul terminated. Never errors out (and
1524 * there is no error code.)
1525 */
1526PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1527 size_t pos, png_const_charp string),PNG_EMPTY);
1528
1529/* Various internal functions to handle formatted warning messages, currently
1530 * only implemented for warnings.
1531 */
1532#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1533/* Utility to dump an unsigned value into a buffer, given a start pointer and
1534 * and end pointer (which should point just *beyond* the end of the buffer!)
1535 * Returns the pointer to the start of the formatted string. This utility only
1536 * does unsigned values.
1537 */
1538PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1539 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1540
1541/* Convenience macro that takes an array: */
1542#define PNG_FORMAT_NUMBER(buffer,format,number) \
1543 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1544
1545/* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1546#define PNG_NUMBER_BUFFER_SIZE 24
1547
1548/* These are the integer formats currently supported, the name is formed from
1549 * the standard printf(3) format string.
1550 */
1551#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1552#define PNG_NUMBER_FORMAT_02u 2
1553#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1554#define PNG_NUMBER_FORMAT_02d 2
1555#define PNG_NUMBER_FORMAT_x 3
1556#define PNG_NUMBER_FORMAT_02x 4
1557#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1558#endif
1559
1560#ifdef PNG_WARNINGS_SUPPORTED
1561/* New defines and members adding in libpng-1.5.4 */
1562# define PNG_WARNING_PARAMETER_SIZE 32
1563# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1564
1565/* An l-value of this type has to be passed to the APIs below to cache the
1566 * values of the parameters to a formatted warning message.
1567 */
1568typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1569 PNG_WARNING_PARAMETER_SIZE];
1570
1571PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1572 int number, png_const_charp string),PNG_EMPTY);
1573 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1574 * including the trailing '\0'.
1575 */
1576PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1577 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1578 PNG_EMPTY);
1579 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1580 * need to output. Use the following for a signed value.
1581 */
1582PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1583 (png_warning_parameters p, int number, int format, png_int_32 value),
1584 PNG_EMPTY);
1585
1586PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1587 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1588 /* 'message' follows the X/Open approach of using @1, @2 to insert
1589 * parameters previously supplied using the above functions. Errors in
1590 * specifying the parameters will simply result in garbage substitutions.
1591 */
1592#endif
1593
1594#ifdef PNG_BENIGN_ERRORS_SUPPORTED
1595/* Application errors (new in 1.6); use these functions (declared below) for
1596 * errors in the parameters or order of API function calls on read. The
1597 * 'warning' should be used for an error that can be handled completely; the
1598 * 'error' for one which can be handled safely but which may lose application
1599 * information or settings.
1600 *
1601 * By default these both result in a png_error call prior to release, while in a
1602 * released version the 'warning' is just a warning. However if the application
1603 * explicitly disables benign errors (explicitly permitting the code to lose
1604 * information) they both turn into warnings.
1605 *
1606 * If benign errors aren't supported they end up as the corresponding base call
1607 * (png_warning or png_error.)
1608 */
1609PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1610 png_const_charp message),PNG_EMPTY);
1611 /* The application provided invalid parameters to an API function or called
1612 * an API function at the wrong time, libpng can completely recover.
1613 */
1614
1615PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1616 png_const_charp message),PNG_EMPTY);
1617 /* As above but libpng will ignore the call, or attempt some other partial
1618 * recovery from the error.
1619 */
1620#else
1621# define png_app_warning(pp,s) png_warning(pp,s)
1622# define png_app_error(pp,s) png_error(pp,s)
1623#endif
1624
1625PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1626 png_const_charp message, int error),PNG_EMPTY);
1627 /* Report a recoverable issue in chunk data. On read this is used to report
1628 * a problem found while reading a particular chunk and the
1629 * png_chunk_benign_error or png_chunk_warning function is used as
1630 * appropriate. On write this is used to report an error that comes from
1631 * data set via an application call to a png_set_ API and png_app_error or
1632 * png_app_warning is used as appropriate.
1633 *
1634 * The 'error' parameter must have one of the following values:
1635 */
1636#define PNG_CHUNK_WARNING 0 /* never an error */
1637#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1638#define PNG_CHUNK_ERROR 2 /* always an error */
1639
1640/* ASCII to FP interfaces, currently only implemented if sCAL
1641 * support is required.
1642 */
1643#if defined(PNG_sCAL_SUPPORTED)
1644/* MAX_DIGITS is actually the maximum number of characters in an sCAL
1645 * width or height, derived from the precision (number of significant
1646 * digits - a build time settable option) and assumptions about the
1647 * maximum ridiculous exponent.
1648 */
1649#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1650
1651#ifdef PNG_FLOATING_POINT_SUPPORTED
1652PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1653 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1654 PNG_EMPTY);
1655#endif /* FLOATING_POINT */
1656
1657#ifdef PNG_FIXED_POINT_SUPPORTED
1658PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1659 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
1660#endif /* FIXED_POINT */
1661#endif /* sCAL */
1662
1663#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1664/* An internal API to validate the format of a floating point number.
1665 * The result is the index of the next character. If the number is
1666 * not valid it will be the index of a character in the supposed number.
1667 *
1668 * The format of a number is defined in the PNG extensions specification
1669 * and this API is strictly conformant to that spec, not anyone elses!
1670 *
1671 * The format as a regular expression is:
1672 *
1673 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1674 *
1675 * or:
1676 *
1677 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1678 *
1679 * The complexity is that either integer or fraction must be present and the
1680 * fraction is permitted to have no digits only if the integer is present.
1681 *
1682 * NOTE: The dangling E problem.
1683 * There is a PNG valid floating point number in the following:
1684 *
1685 * PNG floating point numbers are not greedy.
1686 *
1687 * Working this out requires *TWO* character lookahead (because of the
1688 * sign), the parser does not do this - it will fail at the 'r' - this
1689 * doesn't matter for PNG sCAL chunk values, but it requires more care
1690 * if the value were ever to be embedded in something more complex. Use
1691 * ANSI-C strtod if you need the lookahead.
1692 */
1693/* State table for the parser. */
1694#define PNG_FP_INTEGER 0 /* before or in integer */
1695#define PNG_FP_FRACTION 1 /* before or in fraction */
1696#define PNG_FP_EXPONENT 2 /* before or in exponent */
1697#define PNG_FP_STATE 3 /* mask for the above */
1698#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1699#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1700#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1701#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1702#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1703
1704/* These three values don't affect the parser. They are set but not used.
1705 */
1706#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1707#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1708#define PNG_FP_NONZERO 256 /* A non-zero value */
1709#define PNG_FP_STICKY 448 /* The above three flags */
1710
1711/* This is available for the caller to store in 'state' if required. Do not
1712 * call the parser after setting it (the parser sometimes clears it.)
1713 */
1714#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1715
1716/* Result codes for the parser (boolean - true meants ok, false means
1717 * not ok yet.)
1718 */
1719#define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1720#define PNG_FP_OK 1 /* The number is valid */
1721
1722/* Tests on the sticky non-zero and negative flags. To pass these checks
1723 * the state must also indicate that the whole number is valid - this is
1724 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1725 * is equivalent to PNG_FP_OK above.)
1726 */
1727#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1728 /* NZ_MASK: the string is valid and a non-zero negative value */
1729#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1730 /* Z MASK: the string is valid and a non-zero value. */
1731 /* PNG_FP_SAW_DIGIT: the string is valid. */
1732#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1733#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1734#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1735
1736/* The actual parser. This can be called repeatedly. It updates
1737 * the index into the string and the state variable (which must
1738 * be initialized to 0). It returns a result code, as above. There
1739 * is no point calling the parser any more if it fails to advance to
1740 * the end of the string - it is stuck on an invalid character (or
1741 * terminated by '\0').
1742 *
1743 * Note that the pointer will consume an E or even an E+ and then leave
1744 * a 'maybe' state even though a preceding integer.fraction is valid.
1745 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1746 * a valid number. It's possible to recover from this by calling
1747 * the parser again (from the start, with state 0) but with a string
1748 * that omits the last character (i.e. set the size to the index of
1749 * the problem character.) This has not been tested within libpng.
1750 */
1751PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1752 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1753
1754/* This is the same but it checks a complete string and returns true
1755 * only if it just contains a floating point number. As of 1.5.4 this
1756 * function also returns the state at the end of parsing the number if
1757 * it was valid (otherwise it returns 0.) This can be used for testing
1758 * for negative or zero values using the sticky flag.
1759 */
1760PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1761 png_size_t size),PNG_EMPTY);
1762#endif /* pCAL || sCAL */
1763
1764#if defined(PNG_GAMMA_SUPPORTED) ||\
1765 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1766/* Added at libpng version 1.5.0 */
1767/* This is a utility to provide a*times/div (rounded) and indicate
1768 * if there is an overflow. The result is a boolean - false (0)
1769 * for overflow, true (1) if no overflow, in which case *res
1770 * holds the result.
1771 */
1772PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1773 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1774#endif
1775
1776#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1777/* Same deal, but issue a warning on overflow and return 0. */
1778PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1779 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1780 png_int_32 divided_by),PNG_EMPTY);
1781#endif
1782
1783#ifdef PNG_GAMMA_SUPPORTED
1784/* Calculate a reciprocal - used for gamma values. This returns
1785 * 0 if the argument is 0 in order to maintain an undefined value;
1786 * there are no warnings.
1787 */
1788PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1789 PNG_EMPTY);
1790
1791#ifdef PNG_READ_GAMMA_SUPPORTED
1792/* The same but gives a reciprocal of the product of two fixed point
1793 * values. Accuracy is suitable for gamma calculations but this is
1794 * not exact - use png_muldiv for that. Only required at present on read.
1795 */
1796PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1797 png_fixed_point b),PNG_EMPTY);
1798#endif
1799
1800/* Return true if the gamma value is significantly different from 1.0 */
1801PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1802 PNG_EMPTY);
1803#endif
1804
1805#ifdef PNG_READ_GAMMA_SUPPORTED
1806/* Internal fixed point gamma correction. These APIs are called as
1807 * required to convert single values - they don't need to be fast,
1808 * they are not used when processing image pixel values.
1809 *
1810 * While the input is an 'unsigned' value it must actually be the
1811 * correct bit value - 0..255 or 0..65535 as required.
1812 */
1813PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1814 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1815PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1816 png_fixed_point gamma_value),PNG_EMPTY);
1817PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1818 png_fixed_point gamma_value),PNG_EMPTY);
1819PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1820 PNG_EMPTY);
1821PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1822 int bit_depth),PNG_EMPTY);
1823#endif
1824
1825/* SIMPLIFIED READ/WRITE SUPPORT */
1826#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
1827 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
1828/* The internal structure that png_image::opaque points to. */
1829typedef struct png_control
1830{
1831 png_structp png_ptr;
1832 png_infop info_ptr;
1833 png_voidp error_buf; /* Always a jmp_buf at present. */
1834
1835 png_const_bytep memory; /* Memory buffer. */
1836 png_size_t size; /* Size of the memory buffer. */
1837
1838 unsigned int for_write :1; /* Otherwise it is a read structure */
1839 unsigned int owned_file :1; /* We own the file in io_ptr */
1840} png_control;
1841
1842/* Return the pointer to the jmp_buf from a png_control: necessary because C
1843 * does not reveal the type of the elements of jmp_buf.
1844 */
1845#ifdef __cplusplus
1846# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1847#else
1848# define png_control_jmp_buf(pc) ((pc)->error_buf)
1849#endif
1850
1851/* Utility to safely execute a piece of libpng code catching and logging any
1852 * errors that might occur. Returns true on success, false on failure (either
1853 * of the function or as a result of a png_error.)
1854 */
1855PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
1856 png_const_charp error_message),PNG_NORETURN);
1857
1858#ifdef PNG_WARNINGS_SUPPORTED
1859PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
1860 png_const_charp warning_message),PNG_EMPTY);
1861#else
1862# define png_safe_warning 0/*dummy argument*/
1863#endif
1864
1865PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
1866 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
1867
1868/* Utility to log an error; this also cleans up the png_image; the function
1869 * always returns 0 (false).
1870 */
1871PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
1872 png_const_charp error_message),PNG_EMPTY);
1873
1874#ifndef PNG_SIMPLIFIED_READ_SUPPORTED
1875/* png_image_free is used by the write code but not exported */
1876PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
1877#endif /* !SIMPLIFIED_READ */
1878
1879#endif /* SIMPLIFIED READ/WRITE */
1880
1881/* These are initialization functions for hardware specific PNG filter
1882 * optimizations; list these here then select the appropriate one at compile
1883 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
1884 * the generic code is used.
1885 */
1886#ifdef PNG_FILTER_OPTIMIZATIONS
1887PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
1888 unsigned int bpp), PNG_EMPTY);
1889 /* Just declare the optimization that will be used */
1890#else
1891 /* List *all* the possible optimizations here - this branch is required if
1892 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
1893 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
1894 */
1895PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
1896 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
1897#endif
1898
1899/* Maintainer: Put new private prototypes here ^ */
1900
1901#include "pngdebug.h"
1902
1903#ifdef __cplusplus
1904}
1905#endif
1906
1907#endif /* PNG_VERSION_INFO_ONLY */
1908#endif /* PNGPRIV_H */