2 /* pngpriv.h - private declarations for use inside libpng
4 * For conditions of distribution and use, see copyright notice in png.h
5 * Copyright (c) 1998-2013 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.)
9 * Last changed in libpng 1.6.7 [November 14, 2013]
11 * This code is released under the libpng license.
12 * For conditions of distribution and use, see the disclaimer
13 * and license in png.h
16 /* The symbols declared in this file (including the functions declared
17 * as extern) are PRIVATE. They are not part of the libpng public
18 * interface, and are not recommended for use by regular applications.
19 * Some of them may become public in the future; others may stay private,
20 * change in an incompatible way, or even disappear.
21 * Although the libpng users are not forbidden to include this header,
22 * they should be well aware of the issues that may arise from doing so.
28 /* Feature Test Macros. The following are defined here to ensure that correctly
29 * implemented libraries reveal the APIs libpng needs to build and hide those
30 * that are not needed and potentially damaging to the compilation.
32 * Feature Test Macros must be defined before any system header is included (see
33 * POSIX 1003.1 2.8.2 "POSIX Symbols."
35 * These macros only have an effect if the operating system supports either
36 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
37 * Windows/Visual Studio) there is no effect; the OS specific tests below are
38 * still required (as of 2011-05-02.)
40 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
42 #ifndef PNG_VERSION_INFO_ONLY
43 /* Standard library headers not required by png.h: */
48 #define PNGLIB_BUILD /*libpng is being built, not used*/
50 /* If HAVE_CONFIG_H is defined during the build then the build system must
51 * provide an appropriate "config.h" file on the include path. The header file
52 * must provide definitions as required below (search for "HAVE_CONFIG_H");
53 * see configure.ac for more details of the requirements. The macro
54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
55 * 'configure'; define this macro to prevent the configure build including the
56 * configure generated config.h. Libpng is expected to compile without *any*
57 * special build system support on a reasonably ANSI-C compliant system.
59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
62 /* Pick up the definition of 'restrict' from config.h if it was read: */
63 # define PNG_RESTRICT restrict
66 /* To support symbol prefixing it is necessary to know *before* including png.h
67 * whether the fixed point (and maybe other) APIs are exported, because if they
68 * are not internal definitions may be required. This is handled below just
69 * before png.h is included, but load the configuration now if it is available.
72 # include "pnglibconf.h"
75 /* Local renames may change non-exported API functions from png.h */
76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
77 # include "pngprefix.h"
80 #ifdef PNG_USER_CONFIG
82 /* These should have been defined in pngusr.h */
83 # ifndef PNG_USER_PRIVATEBUILD
84 # define PNG_USER_PRIVATEBUILD "Custom libpng build"
86 # ifndef PNG_USER_DLLFNAME_POSTFIX
87 # define PNG_USER_DLLFNAME_POSTFIX "Cb"
91 /* Compile time options.
92 * =====================
93 * In a multi-arch build the compiler may compile the code several times for the
94 * same object module, producing different binaries for different architectures.
95 * When this happens configure-time setting of the target host options cannot be
96 * done and this interferes with the handling of the ARM NEON optimizations, and
97 * possibly other similar optimizations. Put additional tests here; in general
98 * this is needed when the same option can be changed at both compile time and
99 * run time depending on the target OS (i.e. iOS vs Android.)
101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result
103 * it is necessary to ensure that all extern functions that *might* be used
104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
105 * below is one example of this behavior because it is controlled by the
106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do
107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
110 #ifndef PNG_ARM_NEON_OPT
111 /* ARM NEON optimizations are being controlled by the compiler settings,
112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely
114 * unconditionally on NEON instructions not crashing, otherwise we must
115 * disable use of NEON instructions:
118 # define PNG_ARM_NEON_OPT 2
120 # define PNG_ARM_NEON_OPT 0
124 #if PNG_ARM_NEON_OPT > 0
125 /* NEON optimizations are to be at least considered by libpng, so enable the
126 * callbacks to do this.
128 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
130 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
131 * if possible - if __ARM_NEON__ is set and the compiler version is not known
132 * to be broken. This is control by PNG_ARM_NEON_IMPLEMENTATION which can
135 * 1 The intrinsics code (the default with __ARM_NEON__)
136 * 2 The hand coded assembler (the default without __ARM_NEON__)
138 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
139 * this is *NOT* supported and may cease to work even after a minor revision
140 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
141 * testing or a new compiler, but the results should be communicated to the
142 * libpng implementation list for incorporation in the next minor release.
144 # ifndef PNG_ARM_NEON_IMPLEMENTATION
146 # if defined(__clang__)
147 /* At present it is unknown by the libpng developers which versions
148 * of clang support the intrinsics, however some or perhaps all
149 * versions do not work with the assembler so this may be
150 * irrelevant, so just use the default (do nothing here.)
152 # elif defined(__GNUC__)
153 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
154 * work, so if this *is* GCC, or G++, look for a version >4.5
156 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
157 # define PNG_ARM_NEON_IMPLEMENTATION 2
158 # endif /* no GNUC support */
159 # endif /* __GNUC__ */
160 # else /* !defined __ARM_NEON__ */
161 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
163 # define PNG_ARM_NEON_IMPLEMENTATION 2
164 # endif /* __ARM_NEON__ */
165 # endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */
167 # ifndef PNG_ARM_NEON_IMPLEMENTATION
168 /* Use the intrinsics code by default. */
169 # define PNG_ARM_NEON_IMPLEMENTATION 1
171 #endif /* PNG_ARM_NEON_OPT > 0 */
173 /* Is this a build of a DLL where compilation of the object modules requires
174 * different preprocessor settings to those required for a simple library? If
175 * so PNG_BUILD_DLL must be set.
177 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
178 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
179 * static library of libpng then link the DLL against that.
181 #ifndef PNG_BUILD_DLL
183 /* This is set by libtool when files are compiled for a DLL; libtool
184 * always compiles twice, even on systems where it isn't necessary. Set
185 * PNG_BUILD_DLL in case it is necessary:
187 # define PNG_BUILD_DLL
190 /* This is set by the Microsoft Visual Studio IDE in projects that
191 * build a DLL. It can't easily be removed from those projects (it
192 * isn't visible in the Visual Studio UI) so it is a fairly reliable
193 * indication that PNG_IMPEXP needs to be set to the DLL export
196 # define PNG_BUILD_DLL
199 /* This is set by the Borland C system when compiling for a DLL
202 # define PNG_BUILD_DLL
204 /* Add additional compiler cases here. */
208 #endif /* Setting PNG_BUILD_DLL if required */
210 /* See pngconf.h for more details: the builder of the library may set this on
211 * the command line to the right thing for the specific compilation system or it
212 * may be automagically set above (at present we know of no system where it does
213 * need to be set on the command line.)
215 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
216 * setting it to the "import" setting for a DLL build.
219 # ifdef PNG_BUILD_DLL
220 # define PNG_IMPEXP PNG_DLL_EXPORT
222 /* Not building a DLL, or the DLL doesn't require specific export
229 /* No warnings for private or deprecated functions in the build: */
230 #ifndef PNG_DEPRECATED
231 # define PNG_DEPRECATED
237 /* Symbol preprocessing support.
239 * To enable listing global, but internal, symbols the following macros should
240 * always be used to declare an extern data or function object in this file.
242 #ifndef PNG_INTERNAL_DATA
243 # define PNG_INTERNAL_DATA(type, name, array) extern type name array
246 #ifndef PNG_INTERNAL_FUNCTION
247 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
248 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
251 /* If floating or fixed point APIs are disabled they may still be compiled
252 * internally. To handle this make sure they are declared as the appropriate
253 * internal extern function (otherwise the symbol prefixing stuff won't work and
254 * the functions will be used without definitions.)
256 * NOTE: although all the API functions are declared here they are not all
257 * actually built! Because the declarations are still made it is necessary to
258 * fake out types that they depend on.
260 #ifndef PNG_FP_EXPORT
261 # ifndef PNG_FLOATING_POINT_SUPPORTED
262 # define PNG_FP_EXPORT(ordinal, type, name, args)\
263 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
264 # ifndef PNG_VERSION_INFO_ONLY
265 typedef struct png_incomplete png_double;
266 typedef png_double* png_doublep;
267 typedef const png_double* png_const_doublep;
268 typedef png_double** png_doublepp;
272 #ifndef PNG_FIXED_EXPORT
273 # ifndef PNG_FIXED_POINT_SUPPORTED
274 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
275 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
281 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
282 #ifndef PNG_DLL_EXPORT
283 # define PNG_DLL_EXPORT
286 /* SECURITY and SAFETY:
288 * By default libpng is built without any internal limits on image size,
289 * individual heap (png_malloc) allocations or the total amount of memory used.
290 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used
291 * (unless individually overridden). These limits are believed to be fairly
292 * safe, but builders of secure systems should verify the values against the
293 * real system capabilities.
295 #ifdef PNG_SAFE_LIMITS_SUPPORTED
297 # ifndef PNG_USER_WIDTH_MAX
298 # define PNG_USER_WIDTH_MAX 1000000
300 # ifndef PNG_USER_HEIGHT_MAX
301 # define PNG_USER_HEIGHT_MAX 1000000
303 # ifndef PNG_USER_CHUNK_CACHE_MAX
304 # define PNG_USER_CHUNK_CACHE_MAX 128
306 # ifndef PNG_USER_CHUNK_MALLOC_MAX
307 # define PNG_USER_CHUNK_MALLOC_MAX 8000000
310 /* values for no limits */
311 # ifndef PNG_USER_WIDTH_MAX
312 # define PNG_USER_WIDTH_MAX 0x7fffffff
314 # ifndef PNG_USER_HEIGHT_MAX
315 # define PNG_USER_HEIGHT_MAX 0x7fffffff
317 # ifndef PNG_USER_CHUNK_CACHE_MAX
318 # define PNG_USER_CHUNK_CACHE_MAX 0
320 # ifndef PNG_USER_CHUNK_MALLOC_MAX
321 # define PNG_USER_CHUNK_MALLOC_MAX 0
325 /* Moved to pngpriv.h at libpng-1.5.0 */
326 /* NOTE: some of these may have been used in external applications as
327 * these definitions were exposed in pngconf.h prior to 1.5.
330 /* If you are running on a machine where you cannot allocate more
331 * than 64K of memory at once, uncomment this. While libpng will not
332 * normally need that much memory in a chunk (unless you load up a very
333 * large file), zlib needs to know how big of a chunk it can use, and
334 * libpng thus makes sure to check any memory allocation to verify it
335 * will fit into memory.
337 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
338 * same limit and pngconf.h (already included) sets the limit
339 * if certain operating systems are detected.
341 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
342 # define PNG_MAX_MALLOC_64K
346 /* Unused formal parameter warnings are silenced using the following macro
347 * which is expected to have no bad effects on performance (optimizing
348 * compilers will probably remove it entirely). Note that if you replace
349 * it with something other than whitespace, you must include the terminating
352 # define PNG_UNUSED(param) (void)param;
355 /* Just a little check that someone hasn't tried to define something
358 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
359 # undef PNG_ZBUF_SIZE
360 # define PNG_ZBUF_SIZE 65536L
363 /* If warnings or errors are turned off the code is disabled or redirected here.
364 * From 1.5.4 functions have been added to allow very limited formatting of
365 * error and warning messages - this code will also be disabled here.
367 #ifdef PNG_WARNINGS_SUPPORTED
368 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
370 # define png_warning(s1,s2) ((void)(s1))
371 # define png_chunk_warning(s1,s2) ((void)(s1))
372 # define png_warning_parameter(p,number,string) ((void)0)
373 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
374 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
375 # define png_formatted_warning(pp,p,message) ((void)(pp))
376 # define PNG_WARNING_PARAMETERS(p)
378 #ifndef PNG_ERROR_TEXT_SUPPORTED
379 # define png_error(s1,s2) png_err(s1)
380 # define png_chunk_error(s1,s2) png_err(s1)
381 # define png_fixed_error(s1,s2) png_err(s1)
384 /* C allows up-casts from (void*) to any pointer and (const void*) to any
385 * pointer to a const object. C++ regards this as a type error and requires an
386 * explicit, static, cast and provides the static_cast<> rune to ensure that
387 * const is not cast away.
390 # define png_voidcast(type, value) static_cast<type>(value)
391 # define png_constcast(type, value) const_cast<type>(value)
392 # define png_aligncast(type, value) \
393 static_cast<type>(static_cast<void*>(value))
394 # define png_aligncastconst(type, value) \
395 static_cast<type>(static_cast<const void*>(value))
397 # define png_voidcast(type, value) (value)
398 # define png_constcast(type, value) ((type)(value))
399 # define png_aligncast(type, value) ((void*)(value))
400 # define png_aligncastconst(type, value) ((const void*)(value))
401 #endif /* __cplusplus */
403 /* Some fixed point APIs are still required even if not exported because
404 * they get used by the corresponding floating point APIs. This magic
407 #ifdef PNG_FIXED_POINT_SUPPORTED
408 # define PNGFAPI PNGAPI
410 # define PNGFAPI /* PRIVATE */
413 #ifndef PNG_VERSION_INFO_ONLY
414 /* Other defines specific to compilers can go here. Try to keep
415 * them inside an appropriate ifdef/endif pair for portability.
417 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
418 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
419 /* png.c requires the following ANSI-C constants if the conversion of
420 * floating point to ASCII is implemented therein:
422 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
423 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
424 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
428 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
429 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
430 /* We need to check that <math.h> hasn't already been included earlier
431 * as it seems it doesn't agree with <fp.h>, yet we should really use
432 * <fp.h> if possible.
434 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
440 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
441 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
448 /* This provides the non-ANSI (far) memory allocation routines. */
449 #if defined(__TURBOC__) && defined(__MSDOS__)
454 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
455 defined(_WIN32) || defined(__WIN32__)
456 # include <windows.h> /* defines _WINDOWS_ macro */
458 #endif /* PNG_VERSION_INFO_ONLY */
460 /* Moved here around 1.5.0beta36 from pngconf.h */
461 /* Users may want to use these so they are not private. Any library
462 * functions that are passed far data must be model-independent.
465 /* Memory model/platform independent fns */
468 # define PNG_ABORT() ExitProcess(0)
470 # define PNG_ABORT() abort()
474 /* These macros may need to be architecture dependent. */
475 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
476 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
478 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
480 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
482 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
484 #ifndef PNG_ALIGN_TYPE
485 /* Default to using aligned access optimizations and requiring alignment to a
486 * multiple of the data type size. Override in a compiler specific fashion
487 * if necessary by inserting tests here:
489 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
492 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
493 /* This is used because in some compiler implementations non-aligned
494 * structure members are supported, so the offsetof approach below fails.
495 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
496 * is good for performance. Do not do this unless you have tested the result
499 # define png_alignof(type) (sizeof (type))
501 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
502 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
504 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
505 # define png_alignof(type) (1)
507 /* Else leave png_alignof undefined to prevent use thereof */
511 /* This implicitly assumes alignment is always to a power of 2. */
513 # define png_isaligned(ptr, type)\
514 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
516 # define png_isaligned(ptr, type) 0
519 /* End of memory model/platform independent support */
520 /* End of 1.5.0beta36 move from pngconf.h */
522 /* CONSTANTS and UTILITY MACROS
523 * These are used internally by libpng and not exposed in the API
526 /* Various modes of operation. Note that after an init, mode is set to
527 * zero automatically when the structure is created. Three of these
528 * are defined in png.h because they need to be visible to applications
529 * that call png_set_unknown_chunk().
531 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
532 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
533 #define PNG_HAVE_IDAT 0x04
534 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
535 #define PNG_HAVE_IEND 0x10
539 #define PNG_HAVE_CHUNK_HEADER 0x100
540 #define PNG_WROTE_tIME 0x200
541 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
542 #define PNG_BACKGROUND_IS_GRAY 0x800
543 #define PNG_HAVE_PNG_SIGNATURE 0x1000
544 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
545 /* 0x4000 (unused) */
546 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
548 /* Flags for the transformations the PNG library does on the image data */
549 #define PNG_BGR 0x0001
550 #define PNG_INTERLACE 0x0002
551 #define PNG_PACK 0x0004
552 #define PNG_SHIFT 0x0008
553 #define PNG_SWAP_BYTES 0x0010
554 #define PNG_INVERT_MONO 0x0020
555 #define PNG_QUANTIZE 0x0040
556 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
557 #define PNG_BACKGROUND_EXPAND 0x0100
558 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
559 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
560 #define PNG_RGBA 0x0800
561 #define PNG_EXPAND 0x1000
562 #define PNG_GAMMA 0x2000
563 #define PNG_GRAY_TO_RGB 0x4000
564 #define PNG_FILLER 0x8000
565 #define PNG_PACKSWAP 0x10000
566 #define PNG_SWAP_ALPHA 0x20000
567 #define PNG_STRIP_ALPHA 0x40000
568 #define PNG_INVERT_ALPHA 0x80000
569 #define PNG_USER_TRANSFORM 0x100000
570 #define PNG_RGB_TO_GRAY_ERR 0x200000
571 #define PNG_RGB_TO_GRAY_WARN 0x400000
572 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
573 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
574 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
575 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
576 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
577 /* 0x8000000 unused */
578 /* 0x10000000 unused */
579 /* 0x20000000 unused */
580 /* 0x40000000 unused */
581 /* Flags for png_create_struct */
582 #define PNG_STRUCT_PNG 0x0001
583 #define PNG_STRUCT_INFO 0x0002
585 /* Scaling factor for filter heuristic weighting calculations */
586 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
587 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
589 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
590 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
591 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
593 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
596 #define PNG_FLAG_ROW_INIT 0x0040
597 #define PNG_FLAG_FILLER_AFTER 0x0080
598 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
599 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
600 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
601 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
602 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
603 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
604 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
605 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
606 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
607 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000
608 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
609 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
610 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
611 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
612 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
613 /* 0x800000 unused */
614 /* 0x1000000 unused */
615 /* 0x2000000 unused */
616 /* 0x4000000 unused */
617 /* 0x8000000 unused */
618 /* 0x10000000 unused */
619 /* 0x20000000 unused */
620 /* 0x40000000 unused */
622 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
623 PNG_FLAG_CRC_ANCILLARY_NOWARN)
625 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
626 PNG_FLAG_CRC_CRITICAL_IGNORE)
628 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
629 PNG_FLAG_CRC_CRITICAL_MASK)
631 /* Save typing and make code easier to understand */
633 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
634 abs((int)((c1).green) - (int)((c2).green)) + \
635 abs((int)((c1).blue) - (int)((c2).blue)))
637 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
638 * by dividing by 257 *with rounding*. This macro is exact for the given range.
639 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
640 * macro were established by experiment (modifying the added value). The macro
641 * has a second variant that takes a value already scaled by 255 and divides by
642 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
643 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
645 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
646 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
648 /* Added to libpng-1.2.6 JB */
649 #define PNG_ROWBYTES(pixel_bits, width) \
650 ((pixel_bits) >= 8 ? \
651 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
652 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
654 /* PNG_OUT_OF_RANGE returns true if value is outside the range
655 * ideal-delta..ideal+delta. Each argument is evaluated twice.
656 * "ideal" and "delta" should be constants, normally simple
657 * integers, "value" a variable. Added to libpng-1.2.6 JB
659 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
660 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
662 /* Conversions between fixed and floating point, only defined if
663 * required (to make sure the code doesn't accidentally use float
664 * when it is supposedly disabled.)
666 #ifdef PNG_FLOATING_POINT_SUPPORTED
667 /* The floating point conversion can't overflow, though it can and
668 * does lose accuracy relative to the original fixed point value.
669 * In practice this doesn't matter because png_fixed_point only
670 * stores numbers with very low precision. The png_ptr and s
671 * arguments are unused by default but are there in case error
672 * checking becomes a requirement.
674 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
676 /* The fixed point conversion performs range checking and evaluates
677 * its argument multiple times, so must be used with care. The
678 * range checking uses the PNG specification values for a signed
679 * 32 bit fixed point value except that the values are deliberately
680 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
681 * (2^31-1) * 100000). 's' is a string that describes the value being
684 * NOTE: this macro will raise a png_error if the range check fails,
685 * therefore it is normally only appropriate to use this on values
686 * that come from API calls or other sources where an out of range
687 * error indicates a programming error, not a data error!
689 * NOTE: by default this is off - the macro is not used - because the
690 * function call saves a lot of code.
692 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
693 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
694 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
696 /* else the corresponding function is defined below, inside the scope of the
701 /* Constants for known chunk types. If you need to add a chunk, define the name
702 * here. For historical reasons these constants have the form png_<name>; i.e.
703 * the prefix is lower case. Please use decimal values as the parameters to
704 * match the ISO PNG specification and to avoid relying on the C locale
705 * interpretation of character values.
707 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
708 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
709 * to be generated if required.
711 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
712 * architectures where (int) is only 16 bits.
714 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
715 #define PNG_U32(b1,b2,b3,b4) \
716 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
718 /* Constants for known chunk types.
720 * MAINTAINERS: If you need to add a chunk, define the name here.
721 * For historical reasons these constants have the form png_<name>; i.e.
722 * the prefix is lower case. Please use decimal values as the parameters to
723 * match the ISO PNG specification and to avoid relying on the C locale
724 * interpretation of character values. Please keep the list sorted.
726 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
727 * type. In fact the specification does not express chunk types this way,
728 * however using a 32-bit value means that the chunk type can be read from the
729 * stream using exactly the same code as used for a 32-bit unsigned value and
730 * can be examined far more efficiently (using one arithmetic compare).
732 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
733 * libpng API still uses strings for 'unknown' chunks and a macro,
734 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
735 * that for portable code numeric values must still be used; the string "IHDR"
736 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
738 * In 1.7.0 the definitions will be made public in png.h to avoid having to
739 * duplicate the same definitions in application code.
741 #define png_IDAT PNG_U32( 73, 68, 65, 84)
742 #define png_IEND PNG_U32( 73, 69, 78, 68)
743 #define png_IHDR PNG_U32( 73, 72, 68, 82)
744 #define png_PLTE PNG_U32( 80, 76, 84, 69)
745 #define png_bKGD PNG_U32( 98, 75, 71, 68)
746 #define png_cHRM PNG_U32( 99, 72, 82, 77)
747 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
748 #define png_gAMA PNG_U32(103, 65, 77, 65)
749 #define png_gIFg PNG_U32(103, 73, 70, 103)
750 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
751 #define png_gIFx PNG_U32(103, 73, 70, 120)
752 #define png_hIST PNG_U32(104, 73, 83, 84)
753 #define png_iCCP PNG_U32(105, 67, 67, 80)
754 #define png_iTXt PNG_U32(105, 84, 88, 116)
755 #define png_oFFs PNG_U32(111, 70, 70, 115)
756 #define png_pCAL PNG_U32(112, 67, 65, 76)
757 #define png_pHYs PNG_U32(112, 72, 89, 115)
758 #define png_sBIT PNG_U32(115, 66, 73, 84)
759 #define png_sCAL PNG_U32(115, 67, 65, 76)
760 #define png_sPLT PNG_U32(115, 80, 76, 84)
761 #define png_sRGB PNG_U32(115, 82, 71, 66)
762 #define png_sTER PNG_U32(115, 84, 69, 82)
763 #define png_tEXt PNG_U32(116, 69, 88, 116)
764 #define png_tIME PNG_U32(116, 73, 77, 69)
765 #define png_tRNS PNG_U32(116, 82, 78, 83)
766 #define png_zTXt PNG_U32(122, 84, 88, 116)
768 /* The following will work on (signed char*) strings, whereas the get_uint_32
769 * macro will fail on top-bit-set values because of the sign extension.
771 #define PNG_CHUNK_FROM_STRING(s)\
772 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
774 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
775 * signed and the argument is a (char[]) This macro will fail miserably on
776 * systems where (char) is more than 8 bits.
778 #define PNG_STRING_FROM_CHUNK(s,c)\
779 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
780 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
782 /* Do the same but terminate with a null character. */
783 #define PNG_CSTRING_FROM_CHUNK(s,c)\
784 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
786 /* Test on flag values as defined in the spec (section 5.4): */
787 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
788 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
789 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
790 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
791 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
793 /* Gamma values (new at libpng-1.5.4): */
794 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
795 #define PNG_GAMMA_MAC_INVERSE 65909
796 #define PNG_GAMMA_sRGB_INVERSE 45455
798 /* Almost everything below is C specific; the #defines above can be used in
799 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
801 #ifndef PNG_VERSION_INFO_ONLY
803 #include "pngstruct.h"
806 /* Validate the include paths - the include path used to generate pnglibconf.h
807 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
809 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
810 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
811 "-I (include path) error: see the notes in pngpriv.h"
812 /* This means that when pnglibconf.h was built the copy of zlib.h that it
813 * used is not the same as the one being used here. Because the build of
814 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
815 * zlib version number and because this affects handling of certain broken
816 * PNG files the -I directives must match.
818 * The most likely explanation is that you passed a -I in CFLAGS, this will
819 * not work; all the preprocessor directories and in particular all the -I
820 * directives must be in CPPFLAGS.
824 /* This is used for 16 bit gamma tables -- only the top level pointers are
825 * const; this could be changed:
827 typedef const png_uint_16p * png_const_uint_16pp;
829 /* Added to libpng-1.5.7: sRGB conversion tables */
830 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
831 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
832 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
833 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
834 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
835 * 0..65535. This table gives the closest 16-bit answers (no errors).
839 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
840 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
842 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
843 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
844 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
845 * encoded value with maximum error 0.646365. Note that the input is not a
846 * 16-bit value; it has been multiplied by 255! */
847 #endif /* PNG_SIMPLIFIED_READ/WRITE */
850 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
853 #endif /* __cplusplus */
855 /* Internal functions; these are not exported from a DLL however because they
856 * are used within several of the C source files they have to be C extern.
858 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
862 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
863 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
865 /* Used by the zlib handling functions to ensure that z_stream::msg is always
866 * set before they return.
869 #ifdef PNG_WRITE_SUPPORTED
870 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
871 png_compression_bufferp *list),PNG_EMPTY);
872 /* Free the buffer list used by the compressed write code. */
875 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
876 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
877 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
878 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
879 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
880 (defined(PNG_sCAL_SUPPORTED) && \
881 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
882 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
883 double fp, png_const_charp text),PNG_EMPTY);
886 /* Check the user version string for compatibility, returns false if the version
887 * numbers aren't compatible.
889 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
890 png_const_charp user_png_ver),PNG_EMPTY);
892 /* Internal base allocator - no messages, NULL on failure to allocate. This
893 * does, however, call the application provided allocator and that could call
894 * png_error (although that would be a bug in the application implementation.)
896 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
897 png_alloc_size_t size),PNG_ALLOCATED);
899 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
900 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
901 /* Internal array allocator, outputs no error or warning messages on failure,
904 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
905 int nelements, size_t element_size),PNG_ALLOCATED);
907 /* The same but an existing array is extended by add_elements. This function
908 * also memsets the new elements to 0 and copies the old elements. The old
909 * array is not freed or altered.
911 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
912 png_const_voidp array, int old_elements, int add_elements,
913 size_t element_size),PNG_ALLOCATED);
914 #endif /* text, sPLT or unknown chunks */
916 /* Magic to create a struct when there is no struct to call the user supplied
917 * memory allocators. Because error handling has not been set up the memory
918 * handlers can't safely call png_error, but this is an obscure and undocumented
919 * restriction so libpng has to assume that the 'free' handler, at least, might
922 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
923 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
924 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
925 png_free_ptr free_fn),PNG_ALLOCATED);
927 /* Free memory from internal libpng struct */
928 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
931 /* Free an allocated jmp_buf (always succeeds) */
932 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
934 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
935 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
938 /* Function to free memory for zlib. PNGAPI is disallowed. */
939 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
941 /* Next four functions are used internally as callbacks. PNGCBAPI is required
942 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
946 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
947 png_bytep data, png_size_t length),PNG_EMPTY);
949 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
950 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
951 png_bytep buffer, png_size_t length),PNG_EMPTY);
954 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
955 png_bytep data, png_size_t length),PNG_EMPTY);
957 #ifdef PNG_WRITE_FLUSH_SUPPORTED
958 # ifdef PNG_STDIO_SUPPORTED
959 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
964 /* Reset the CRC variable */
965 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
967 /* Write the "data" buffer to whatever output you are using */
968 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
969 png_const_bytep data, png_size_t length),PNG_EMPTY);
971 /* Read and check the PNG file signature */
972 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
973 png_inforp info_ptr),PNG_EMPTY);
975 /* Read the chunk header (length + type name) */
976 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
979 /* Read data from whatever input you are using into the "data" buffer */
980 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
981 png_size_t length),PNG_EMPTY);
983 /* Read bytes into buf, and update png_ptr->crc */
984 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
985 png_uint_32 length),PNG_EMPTY);
987 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
988 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
989 png_uint_32 skip),PNG_EMPTY);
991 /* Read the CRC from the file and compare it to the libpng calculated CRC */
992 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
994 /* Calculate the CRC over a section of data. Note that we are only
995 * passing a maximum of 64K on systems that have this as a memory limit,
996 * since this is the maximum buffer size we can specify.
998 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
999 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
1001 #ifdef PNG_WRITE_FLUSH_SUPPORTED
1002 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
1005 /* Write various chunks */
1007 /* Write the IHDR chunk, and update the png_struct with the necessary
1010 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
1011 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
1012 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
1014 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
1015 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
1017 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
1018 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
1021 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
1023 #ifdef PNG_WRITE_gAMA_SUPPORTED
1024 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
1025 png_fixed_point file_gamma),PNG_EMPTY);
1028 #ifdef PNG_WRITE_sBIT_SUPPORTED
1029 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
1030 png_const_color_8p sbit, int color_type),PNG_EMPTY);
1033 #ifdef PNG_WRITE_cHRM_SUPPORTED
1034 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
1035 const png_xy *xy), PNG_EMPTY);
1036 /* The xy value must have been previously validated */
1039 #ifdef PNG_WRITE_sRGB_SUPPORTED
1040 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
1041 int intent),PNG_EMPTY);
1044 #ifdef PNG_WRITE_iCCP_SUPPORTED
1045 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
1046 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
1047 /* The profile must have been previously validated for correctness, the
1048 * length comes from the first four bytes. Only the base, deflate,
1049 * compression is supported.
1053 #ifdef PNG_WRITE_sPLT_SUPPORTED
1054 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
1055 png_const_sPLT_tp palette),PNG_EMPTY);
1058 #ifdef PNG_WRITE_tRNS_SUPPORTED
1059 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
1060 png_const_bytep trans, png_const_color_16p values, int number,
1061 int color_type),PNG_EMPTY);
1064 #ifdef PNG_WRITE_bKGD_SUPPORTED
1065 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
1066 png_const_color_16p values, int color_type),PNG_EMPTY);
1069 #ifdef PNG_WRITE_hIST_SUPPORTED
1070 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
1071 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
1074 /* Chunks that have keywords */
1075 #ifdef PNG_WRITE_tEXt_SUPPORTED
1076 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
1077 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
1080 #ifdef PNG_WRITE_zTXt_SUPPORTED
1081 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
1082 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY);
1085 #ifdef PNG_WRITE_iTXt_SUPPORTED
1086 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
1087 int compression, png_const_charp key, png_const_charp lang,
1088 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
1091 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
1092 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
1093 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
1096 #ifdef PNG_WRITE_oFFs_SUPPORTED
1097 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
1098 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
1101 #ifdef PNG_WRITE_pCAL_SUPPORTED
1102 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
1103 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
1104 png_const_charp units, png_charpp params),PNG_EMPTY);
1107 #ifdef PNG_WRITE_pHYs_SUPPORTED
1108 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
1109 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
1110 int unit_type),PNG_EMPTY);
1113 #ifdef PNG_WRITE_tIME_SUPPORTED
1114 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
1115 png_const_timep mod_time),PNG_EMPTY);
1118 #ifdef PNG_WRITE_sCAL_SUPPORTED
1119 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
1120 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
1123 /* Called when finished processing a row of data */
1124 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
1127 /* Internal use only. Called before first row of data */
1128 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
1131 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
1132 * array of png_ptr->width pixels. If the image is not interlaced or this
1133 * is the final pass this just does a memcpy, otherwise the "display" flag
1134 * is used to determine whether to copy pixels that are not in the current pass.
1136 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
1137 * function to achieve the documented 'blocky' appearance during interlaced read
1138 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
1139 * are not changed if they are not in the current pass, when display is 0.
1141 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
1143 * The API always reads from the png_struct row buffer and always assumes that
1144 * it is full width (png_do_read_interlace has already been called.)
1146 * This function is only ever used to write to row buffers provided by the
1147 * caller of the relevant libpng API and the row must have already been
1148 * transformed by the read transformations.
1150 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
1151 * bitmasks for use within the code, otherwise runtime generated masks are used.
1152 * The default is compile time masks.
1154 #ifndef PNG_USE_COMPILE_TIME_MASKS
1155 # define PNG_USE_COMPILE_TIME_MASKS 1
1157 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
1158 png_bytep row, int display),PNG_EMPTY);
1160 #ifdef PNG_READ_INTERLACING_SUPPORTED
1161 /* Expand an interlaced row: the 'row_info' describes the pass data that has
1162 * been read in and must correspond to the pixels in 'row', the pixels are
1163 * expanded (moved apart) in 'row' to match the final layout, when doing this
1164 * the pixels are *replicated* to the intervening space. This is essential for
1165 * the correct operation of png_combine_row, above.
1167 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
1168 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
1171 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
1173 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
1174 /* Grab pixels out of a row for an interlaced pass */
1175 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
1176 png_bytep row, int pass),PNG_EMPTY);
1179 /* Unfilter a row: check the filter value before calling this, there is no point
1180 * calling it for PNG_FILTER_VALUE_NONE.
1182 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
1183 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
1185 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
1186 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1187 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_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_sub4_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_avg3_neon,(png_row_infop
1192 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1193 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
1194 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1195 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
1196 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1197 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
1198 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
1200 /* Choose the best filter to use and filter the row data */
1201 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
1202 png_row_infop row_info),PNG_EMPTY);
1204 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1205 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
1206 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
1207 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
1208 * is NULL the function checks, instead, for the end of the stream. In this
1209 * case a benign error will be issued if the stream end is not found or if
1210 * extra data has to be consumed.
1212 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
1214 /* This cleans up when the IDAT LZ stream does not end when the last image
1215 * byte is read; there is still some pending input.
1218 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
1220 /* Finish a row while reading, dealing with interlacing passes, etc. */
1223 /* Initialize the row buffers, etc. */
1224 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
1226 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1227 /* Optional call to update the users info structure */
1228 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
1229 png_inforp info_ptr),PNG_EMPTY);
1232 /* These are the functions that do the transformations */
1233 #ifdef PNG_READ_FILLER_SUPPORTED
1234 PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info,
1235 png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY);
1238 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
1239 PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info,
1240 png_bytep row),PNG_EMPTY);
1243 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
1244 PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info,
1245 png_bytep row),PNG_EMPTY);
1248 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
1249 PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info,
1250 png_bytep row),PNG_EMPTY);
1253 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
1254 PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info,
1255 png_bytep row),PNG_EMPTY);
1258 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
1259 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1260 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
1261 png_bytep row, int at_start),PNG_EMPTY);
1264 #ifdef PNG_16BIT_SUPPORTED
1265 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1266 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
1267 png_bytep row),PNG_EMPTY);
1271 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1272 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1273 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
1274 png_bytep row),PNG_EMPTY);
1277 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1278 PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr,
1279 png_row_infop row_info, png_bytep row),PNG_EMPTY);
1282 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1283 PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info,
1284 png_bytep row),PNG_EMPTY);
1287 #ifdef PNG_READ_PACK_SUPPORTED
1288 PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info,
1289 png_bytep row),PNG_EMPTY);
1292 #ifdef PNG_READ_SHIFT_SUPPORTED
1293 PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info,
1294 png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY);
1297 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1298 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
1299 png_bytep row),PNG_EMPTY);
1302 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
1303 PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info,
1304 png_bytep row),PNG_EMPTY);
1307 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
1308 PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info,
1309 png_bytep row),PNG_EMPTY);
1312 #ifdef PNG_READ_QUANTIZE_SUPPORTED
1313 PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info,
1314 png_bytep row, png_const_bytep palette_lookup,
1315 png_const_bytep quantize_lookup),PNG_EMPTY);
1317 # ifdef PNG_CORRECT_PALETTE_SUPPORTED
1318 PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr,
1319 png_colorp palette, int num_palette),PNG_EMPTY);
1323 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1324 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
1325 png_bytep row),PNG_EMPTY);
1328 #ifdef PNG_WRITE_PACK_SUPPORTED
1329 PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info,
1330 png_bytep row, png_uint_32 bit_depth),PNG_EMPTY);
1333 #ifdef PNG_WRITE_SHIFT_SUPPORTED
1334 PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info,
1335 png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY);
1338 #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
1339 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
1340 PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info,
1341 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1344 #ifdef PNG_READ_GAMMA_SUPPORTED
1345 PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info,
1346 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1349 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1350 PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info,
1351 png_bytep row, png_structrp png_ptr),PNG_EMPTY);
1354 #ifdef PNG_READ_EXPAND_SUPPORTED
1355 PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info,
1356 png_bytep row, png_const_colorp palette, png_const_bytep trans,
1357 int num_trans),PNG_EMPTY);
1358 PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info,
1359 png_bytep row, png_const_color_16p trans_color),PNG_EMPTY);
1362 #ifdef PNG_READ_EXPAND_16_SUPPORTED
1363 PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info,
1364 png_bytep row),PNG_EMPTY);
1367 /* The following decodes the appropriate chunks, and does error correction,
1368 * then calls the appropriate callback for the chunk if it is valid.
1371 /* Decode the IHDR chunk */
1372 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
1373 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1374 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
1375 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1376 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
1377 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1379 #ifdef PNG_READ_bKGD_SUPPORTED
1380 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
1381 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1384 #ifdef PNG_READ_cHRM_SUPPORTED
1385 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
1386 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1389 #ifdef PNG_READ_gAMA_SUPPORTED
1390 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
1391 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1394 #ifdef PNG_READ_hIST_SUPPORTED
1395 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
1396 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1399 #ifdef PNG_READ_iCCP_SUPPORTED
1400 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
1401 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1402 #endif /* PNG_READ_iCCP_SUPPORTED */
1404 #ifdef PNG_READ_iTXt_SUPPORTED
1405 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
1406 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1409 #ifdef PNG_READ_oFFs_SUPPORTED
1410 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
1411 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1414 #ifdef PNG_READ_pCAL_SUPPORTED
1415 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
1416 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1419 #ifdef PNG_READ_pHYs_SUPPORTED
1420 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
1421 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1424 #ifdef PNG_READ_sBIT_SUPPORTED
1425 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
1426 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1429 #ifdef PNG_READ_sCAL_SUPPORTED
1430 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
1431 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1434 #ifdef PNG_READ_sPLT_SUPPORTED
1435 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
1436 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1437 #endif /* PNG_READ_sPLT_SUPPORTED */
1439 #ifdef PNG_READ_sRGB_SUPPORTED
1440 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
1441 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1444 #ifdef PNG_READ_tEXt_SUPPORTED
1445 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
1446 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1449 #ifdef PNG_READ_tIME_SUPPORTED
1450 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
1451 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1454 #ifdef PNG_READ_tRNS_SUPPORTED
1455 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
1456 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1459 #ifdef PNG_READ_zTXt_SUPPORTED
1460 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
1461 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1464 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
1465 png_uint_32 chunk_name),PNG_EMPTY);
1467 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
1468 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
1469 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
1470 /* This is the function that gets called for unknown chunks. The 'keep'
1471 * argument is either non-zero for a known chunk that has been set to be
1472 * handled as unknown or zero for an unknown chunk. By default the function
1473 * just skips the chunk or errors out if it is critical.
1476 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
1477 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1478 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
1479 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
1480 /* Exactly as the API png_handle_as_unknown() except that the argument is a
1481 * 32-bit chunk name, not a string.
1483 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
1484 #endif /* PNG_SET_UNKNOWN_CHUNKS_SUPPORTED */
1486 /* Handle the transformations for reading and writing */
1487 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1488 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
1489 png_row_infop row_info),PNG_EMPTY);
1491 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
1492 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
1493 png_row_infop row_info),PNG_EMPTY);
1496 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
1497 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
1501 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1502 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
1503 png_inforp info_ptr),PNG_EMPTY);
1504 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
1505 png_inforp info_ptr),PNG_EMPTY);
1506 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
1507 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
1508 png_uint_32 length),PNG_EMPTY);
1509 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
1511 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
1513 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
1514 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1515 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
1516 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
1517 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
1518 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
1520 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
1521 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1522 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
1523 png_inforp info_ptr),PNG_EMPTY);
1524 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
1525 png_inforp info_ptr),PNG_EMPTY);
1526 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
1527 png_bytep row),PNG_EMPTY);
1528 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
1529 png_inforp info_ptr),PNG_EMPTY);
1530 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
1531 png_inforp info_ptr),PNG_EMPTY);
1532 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
1534 # ifdef PNG_READ_tEXt_SUPPORTED
1535 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
1536 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1537 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
1538 png_inforp info_ptr),PNG_EMPTY);
1540 # ifdef PNG_READ_zTXt_SUPPORTED
1541 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
1542 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1543 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
1544 png_inforp info_ptr),PNG_EMPTY);
1546 # ifdef PNG_READ_iTXt_SUPPORTED
1547 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
1548 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
1549 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
1550 png_inforp info_ptr),PNG_EMPTY);
1553 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1555 #ifdef PNG_MNG_FEATURES_SUPPORTED
1556 PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info,
1557 png_bytep row),PNG_EMPTY);
1558 PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info,
1559 png_bytep row),PNG_EMPTY);
1562 /* Added at libpng version 1.6.0 */
1563 #ifdef PNG_GAMMA_SUPPORTED
1564 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
1565 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
1566 /* Set the colorspace gamma with a value provided by the application or by
1567 * the gAMA chunk on read. The value will override anything set by an ICC
1571 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
1572 png_inforp info_ptr), PNG_EMPTY);
1573 /* Synchronize the info 'valid' flags with the colorspace */
1575 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
1576 png_inforp info_ptr), PNG_EMPTY);
1577 /* Copy the png_struct colorspace to the info_struct and call the above to
1578 * synchronize the flags. Checks for NULL info_ptr and does nothing.
1582 /* Added at libpng version 1.4.0 */
1583 #ifdef PNG_COLORSPACE_SUPPORTED
1584 /* These internal functions are for maintaining the colorspace structure within
1585 * a png_info or png_struct (or, indeed, both).
1587 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
1588 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
1589 int preferred), PNG_EMPTY);
1591 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
1592 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
1593 int preferred), PNG_EMPTY);
1595 #ifdef PNG_sRGB_SUPPORTED
1596 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
1597 png_colorspacerp colorspace, int intent), PNG_EMPTY);
1598 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
1599 * flags to write them, if it returns false there was a problem and an error
1600 * message has already been output (but the colorspace may still need to be
1601 * synced to record the invalid flag).
1605 #ifdef PNG_iCCP_SUPPORTED
1606 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
1607 png_colorspacerp colorspace, png_const_charp name,
1608 png_uint_32 profile_length, png_const_bytep profile, int color_type),
1610 /* The 'name' is used for information only */
1612 /* Routines for checking parts of an ICC profile. */
1613 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
1614 png_colorspacerp colorspace, png_const_charp name,
1615 png_uint_32 profile_length), PNG_EMPTY);
1616 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
1617 png_colorspacerp colorspace, png_const_charp name,
1618 png_uint_32 profile_length,
1619 png_const_bytep profile /* first 132 bytes only */, int color_type),
1621 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
1622 png_colorspacerp colorspace, png_const_charp name,
1623 png_uint_32 profile_length,
1624 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
1625 #ifdef PNG_sRGB_SUPPORTED
1626 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
1627 png_const_structrp png_ptr, png_colorspacerp colorspace,
1628 png_const_bytep profile, uLong adler), PNG_EMPTY);
1629 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
1630 * be zero to indicate that it is not available. It is used, if provided,
1631 * as a fast check on the profile when checking to see if it is sRGB.
1636 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1637 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
1638 (png_structrp png_ptr), PNG_EMPTY);
1639 /* Set the rgb_to_gray coefficients from the colorspace Y values */
1640 #endif /* READ_RGB_TO_GRAY */
1641 #endif /* COLORSPACE */
1643 /* Added at libpng version 1.4.0 */
1644 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
1645 png_uint_32 width, png_uint_32 height, int bit_depth,
1646 int color_type, int interlace_type, int compression_type,
1647 int filter_type),PNG_EMPTY);
1649 /* Added at libpng version 1.5.10 */
1650 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
1651 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
1652 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
1653 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
1656 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
1657 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
1658 png_const_charp name),PNG_NORETURN);
1661 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
1662 * the end. Always leaves the buffer nul terminated. Never errors out (and
1663 * there is no error code.)
1665 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
1666 size_t pos, png_const_charp string),PNG_EMPTY);
1668 /* Various internal functions to handle formatted warning messages, currently
1669 * only implemented for warnings.
1671 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
1672 /* Utility to dump an unsigned value into a buffer, given a start pointer and
1673 * and end pointer (which should point just *beyond* the end of the buffer!)
1674 * Returns the pointer to the start of the formatted string. This utility only
1675 * does unsigned values.
1677 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
1678 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
1680 /* Convenience macro that takes an array: */
1681 #define PNG_FORMAT_NUMBER(buffer,format,number) \
1682 png_format_number(buffer, buffer + (sizeof buffer), format, number)
1684 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
1685 #define PNG_NUMBER_BUFFER_SIZE 24
1687 /* These are the integer formats currently supported, the name is formed from
1688 * the standard printf(3) format string.
1690 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
1691 #define PNG_NUMBER_FORMAT_02u 2
1692 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
1693 #define PNG_NUMBER_FORMAT_02d 2
1694 #define PNG_NUMBER_FORMAT_x 3
1695 #define PNG_NUMBER_FORMAT_02x 4
1696 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
1699 #ifdef PNG_WARNINGS_SUPPORTED
1700 /* New defines and members adding in libpng-1.5.4 */
1701 # define PNG_WARNING_PARAMETER_SIZE 32
1702 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
1704 /* An l-value of this type has to be passed to the APIs below to cache the
1705 * values of the parameters to a formatted warning message.
1707 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
1708 PNG_WARNING_PARAMETER_SIZE];
1710 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
1711 int number, png_const_charp string),PNG_EMPTY);
1712 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
1713 * including the trailing '\0'.
1715 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
1716 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
1718 /* Use png_alloc_size_t because it is an unsigned type as big as any we
1719 * need to output. Use the following for a signed value.
1721 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
1722 (png_warning_parameters p, int number, int format, png_int_32 value),
1725 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
1726 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
1727 /* 'message' follows the X/Open approach of using @1, @2 to insert
1728 * parameters previously supplied using the above functions. Errors in
1729 * specifying the parameters will simply result in garbage substitutions.
1733 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
1734 /* Application errors (new in 1.6); use these functions (declared below) for
1735 * errors in the parameters or order of API function calls on read. The
1736 * 'warning' should be used for an error that can be handled completely; the
1737 * 'error' for one which can be handled safely but which may lose application
1738 * information or settings.
1740 * By default these both result in a png_error call prior to release, while in a
1741 * released version the 'warning' is just a warning. However if the application
1742 * explicitly disables benign errors (explicitly permitting the code to lose
1743 * information) they both turn into warnings.
1745 * If benign errors aren't supported they end up as the corresponding base call
1746 * (png_warning or png_error.)
1748 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
1749 png_const_charp message),PNG_EMPTY);
1750 /* The application provided invalid parameters to an API function or called
1751 * an API function at the wrong time, libpng can completely recover.
1754 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
1755 png_const_charp message),PNG_EMPTY);
1756 /* As above but libpng will ignore the call, or attempt some other partial
1757 * recovery from the error.
1760 # define png_app_warning(pp,s) png_warning(pp,s)
1761 # define png_app_error(pp,s) png_error(pp,s)
1764 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
1765 png_const_charp message, int error),PNG_EMPTY);
1766 /* Report a recoverable issue in chunk data. On read this is used to report
1767 * a problem found while reading a particular chunk and the
1768 * png_chunk_benign_error or png_chunk_warning function is used as
1769 * appropriate. On write this is used to report an error that comes from
1770 * data set via an application call to a png_set_ API and png_app_error or
1771 * png_app_warning is used as appropriate.
1773 * The 'error' parameter must have one of the following values:
1775 #define PNG_CHUNK_WARNING 0 /* never an error */
1776 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
1777 #define PNG_CHUNK_ERROR 2 /* always an error */
1779 /* ASCII to FP interfaces, currently only implemented if sCAL
1780 * support is required.
1782 #if defined(PNG_sCAL_SUPPORTED)
1783 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
1784 * width or height, derived from the precision (number of significant
1785 * digits - a build time settable option) and assumptions about the
1786 * maximum ridiculous exponent.
1788 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
1790 #ifdef PNG_FLOATING_POINT_SUPPORTED
1791 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
1792 png_charp ascii, png_size_t size, double fp, unsigned int precision),
1794 #endif /* FLOATING_POINT */
1796 #ifdef PNG_FIXED_POINT_SUPPORTED
1797 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
1798 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
1799 #endif /* FIXED_POINT */
1802 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
1803 /* An internal API to validate the format of a floating point number.
1804 * The result is the index of the next character. If the number is
1805 * not valid it will be the index of a character in the supposed number.
1807 * The format of a number is defined in the PNG extensions specification
1808 * and this API is strictly conformant to that spec, not anyone elses!
1810 * The format as a regular expression is:
1812 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
1816 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
1818 * The complexity is that either integer or fraction must be present and the
1819 * fraction is permitted to have no digits only if the integer is present.
1821 * NOTE: The dangling E problem.
1822 * There is a PNG valid floating point number in the following:
1824 * PNG floating point numbers are not greedy.
1826 * Working this out requires *TWO* character lookahead (because of the
1827 * sign), the parser does not do this - it will fail at the 'r' - this
1828 * doesn't matter for PNG sCAL chunk values, but it requires more care
1829 * if the value were ever to be embedded in something more complex. Use
1830 * ANSI-C strtod if you need the lookahead.
1832 /* State table for the parser. */
1833 #define PNG_FP_INTEGER 0 /* before or in integer */
1834 #define PNG_FP_FRACTION 1 /* before or in fraction */
1835 #define PNG_FP_EXPONENT 2 /* before or in exponent */
1836 #define PNG_FP_STATE 3 /* mask for the above */
1837 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
1838 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
1839 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
1840 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
1841 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
1843 /* These three values don't affect the parser. They are set but not used.
1845 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
1846 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
1847 #define PNG_FP_NONZERO 256 /* A non-zero value */
1848 #define PNG_FP_STICKY 448 /* The above three flags */
1850 /* This is available for the caller to store in 'state' if required. Do not
1851 * call the parser after setting it (the parser sometimes clears it.)
1853 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
1855 /* Result codes for the parser (boolean - true meants ok, false means
1858 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
1859 #define PNG_FP_OK 1 /* The number is valid */
1861 /* Tests on the sticky non-zero and negative flags. To pass these checks
1862 * the state must also indicate that the whole number is valid - this is
1863 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
1864 * is equivalent to PNG_FP_OK above.)
1866 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
1867 /* NZ_MASK: the string is valid and a non-zero negative value */
1868 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
1869 /* Z MASK: the string is valid and a non-zero value. */
1870 /* PNG_FP_SAW_DIGIT: the string is valid. */
1871 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
1872 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
1873 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
1875 /* The actual parser. This can be called repeatedly. It updates
1876 * the index into the string and the state variable (which must
1877 * be initialized to 0). It returns a result code, as above. There
1878 * is no point calling the parser any more if it fails to advance to
1879 * the end of the string - it is stuck on an invalid character (or
1880 * terminated by '\0').
1882 * Note that the pointer will consume an E or even an E+ and then leave
1883 * a 'maybe' state even though a preceding integer.fraction is valid.
1884 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
1885 * a valid number. It's possible to recover from this by calling
1886 * the parser again (from the start, with state 0) but with a string
1887 * that omits the last character (i.e. set the size to the index of
1888 * the problem character.) This has not been tested within libpng.
1890 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
1891 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
1893 /* This is the same but it checks a complete string and returns true
1894 * only if it just contains a floating point number. As of 1.5.4 this
1895 * function also returns the state at the end of parsing the number if
1896 * it was valid (otherwise it returns 0.) This can be used for testing
1897 * for negative or zero values using the sticky flag.
1899 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
1900 png_size_t size),PNG_EMPTY);
1901 #endif /* pCAL || sCAL */
1903 #if defined(PNG_READ_GAMMA_SUPPORTED) ||\
1904 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
1905 /* Added at libpng version 1.5.0 */
1906 /* This is a utility to provide a*times/div (rounded) and indicate
1907 * if there is an overflow. The result is a boolean - false (0)
1908 * for overflow, true (1) if no overflow, in which case *res
1911 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
1912 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
1915 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
1916 /* Same deal, but issue a warning on overflow and return 0. */
1917 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
1918 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
1919 png_int_32 divided_by),PNG_EMPTY);
1922 #ifdef PNG_GAMMA_SUPPORTED
1923 /* Calculate a reciprocal - used for gamma values. This returns
1924 * 0 if the argument is 0 in order to maintain an undefined value;
1925 * there are no warnings.
1927 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
1930 #ifdef PNG_READ_GAMMA_SUPPORTED
1931 /* The same but gives a reciprocal of the product of two fixed point
1932 * values. Accuracy is suitable for gamma calculations but this is
1933 * not exact - use png_muldiv for that. Only required at present on read.
1935 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
1936 png_fixed_point b),PNG_EMPTY);
1939 /* Return true if the gamma value is significantly different from 1.0 */
1940 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
1944 #ifdef PNG_READ_GAMMA_SUPPORTED
1945 /* Internal fixed point gamma correction. These APIs are called as
1946 * required to convert single values - they don't need to be fast,
1947 * they are not used when processing image pixel values.
1949 * While the input is an 'unsigned' value it must actually be the
1950 * correct bit value - 0..255 or 0..65535 as required.
1952 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
1953 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
1954 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
1955 png_fixed_point gamma_value),PNG_EMPTY);
1956 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
1957 png_fixed_point gamma_value),PNG_EMPTY);
1958 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
1960 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
1961 int bit_depth),PNG_EMPTY);
1964 /* SIMPLIFIED READ/WRITE SUPPORT */
1965 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
1966 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
1967 /* The internal structure that png_image::opaque points to. */
1968 typedef struct png_control
1970 png_structp png_ptr;
1972 png_voidp error_buf; /* Always a jmp_buf at present. */
1974 png_const_bytep memory; /* Memory buffer. */
1975 png_size_t size; /* Size of the memory buffer. */
1977 unsigned int for_write :1; /* Otherwise it is a read structure */
1978 unsigned int owned_file :1; /* We own the file in io_ptr */
1981 /* Return the pointer to the jmp_buf from a png_control: necessary because C
1982 * does not reveal the type of the elements of jmp_buf.
1985 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
1987 # define png_control_jmp_buf(pc) ((pc)->error_buf)
1990 /* Utility to safely execute a piece of libpng code catching and logging any
1991 * errors that might occur. Returns true on success, false on failure (either
1992 * of the function or as a result of a png_error.)
1994 PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr,
1995 png_const_charp error_message),PNG_NORETURN);
1997 #ifdef PNG_WARNINGS_SUPPORTED
1998 PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr,
1999 png_const_charp warning_message),PNG_EMPTY);
2001 # define png_safe_warning 0/*dummy argument*/
2004 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
2005 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
2007 /* Utility to log an error; this also cleans up the png_image; the function
2008 * always returns 0 (false).
2010 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
2011 png_const_charp error_message),PNG_EMPTY);
2013 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
2014 /* png_image_free is used by the write code but not exported */
2015 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
2016 #endif /* !SIMPLIFIED_READ */
2018 #endif /* SIMPLIFIED READ/WRITE */
2020 /* These are initialization functions for hardware specific PNG filter
2021 * optimizations; list these here then select the appropriate one at compile
2022 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
2023 * the generic code is used.
2025 #ifdef PNG_FILTER_OPTIMIZATIONS
2026 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
2027 unsigned int bpp), PNG_EMPTY);
2028 /* Just declare the optimization that will be used */
2030 /* List *all* the possible optimizations here - this branch is required if
2031 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
2032 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
2034 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
2035 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
2038 /* Maintainer: Put new private prototypes here ^ */
2040 #include "pngdebug.h"
2046 #endif /* PNG_VERSION_INFO_ONLY */
2047 #endif /* PNGPRIV_H */
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