/* pngpriv.h - private declarations for use inside libpng | |
* | |
* For conditions of distribution and use, see copyright notice in png.h | |
* Copyright (c) 1998-2013 Glenn Randers-Pehrson | |
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
* | |
* Last changed in libpng 1.6.3 [July 18, 2013] | |
* | |
* This code is released under the libpng license. | |
* For conditions of distribution and use, see the disclaimer | |
* and license in png.h | |
*/ | |
/* The symbols declared in this file (including the functions declared | |
* as extern) are PRIVATE. They are not part of the libpng public | |
* interface, and are not recommended for use by regular applications. | |
* Some of them may become public in the future; others may stay private, | |
* change in an incompatible way, or even disappear. | |
* Although the libpng users are not forbidden to include this header, | |
* they should be well aware of the issues that may arise from doing so. | |
*/ | |
#ifndef PNGPRIV_H | |
#define PNGPRIV_H | |
/* Feature Test Macros. The following are defined here to ensure that correctly | |
* implemented libraries reveal the APIs libpng needs to build and hide those | |
* that are not needed and potentially damaging to the compilation. | |
* | |
* Feature Test Macros must be defined before any system header is included (see | |
* POSIX 1003.1 2.8.2 "POSIX Symbols." | |
* | |
* These macros only have an effect if the operating system supports either | |
* POSIX 1003.1 or C99, or both. On other operating systems (particularly | |
* Windows/Visual Studio) there is no effect; the OS specific tests below are | |
* still required (as of 2011-05-02.) | |
*/ | |
#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ | |
#ifndef PNG_VERSION_INFO_ONLY | |
/* Standard library headers not required by png.h: */ | |
# include <stdlib.h> | |
# include <string.h> | |
#endif | |
#define PNGLIB_BUILD /*libpng is being built, not used*/ | |
/* If HAVE_CONFIG_H is defined during the build then the build system must | |
* provide an appropriate "config.h" file on the include path. The header file | |
* must provide definitions as required below (search for "HAVE_CONFIG_H"); | |
* see configure.ac for more details of the requirements. The macro | |
* "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on | |
* 'configure'; define this macro to prevent the configure build including the | |
* configure generated config.h. Libpng is expected to compile without *any* | |
* special build system support on a reasonably ANSI-C compliant system. | |
*/ | |
#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) | |
# include <config.h> | |
/* Pick up the definition of 'restrict' from config.h if it was read: */ | |
# define PNG_RESTRICT restrict | |
#endif | |
/* To support symbol prefixing it is necessary to know *before* including png.h | |
* whether the fixed point (and maybe other) APIs are exported, because if they | |
* are not internal definitions may be required. This is handled below just | |
* before png.h is included, but load the configuration now if it is available. | |
*/ | |
#ifndef PNGLCONF_H | |
# include "pnglibconf.h" | |
#endif | |
/* Local renames may change non-exported API functions from png.h */ | |
#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) | |
# include "pngprefix.h" | |
#endif | |
#ifdef PNG_USER_CONFIG | |
# include "pngusr.h" | |
/* These should have been defined in pngusr.h */ | |
# ifndef PNG_USER_PRIVATEBUILD | |
# define PNG_USER_PRIVATEBUILD "Custom libpng build" | |
# endif | |
# ifndef PNG_USER_DLLFNAME_POSTFIX | |
# define PNG_USER_DLLFNAME_POSTFIX "Cb" | |
# endif | |
#endif | |
/* Compile time options. | |
* ===================== | |
* In a multi-arch build the compiler may compile the code several times for the | |
* same object module, producing different binaries for different architectures. | |
* When this happens configure-time setting of the target host options cannot be | |
* done and this interferes with the handling of the ARM NEON optimizations, and | |
* possibly other similar optimizations. Put additional tests here; in general | |
* this is needed when the same option can be changed at both compile time and | |
* run time depending on the target OS (i.e. iOS vs Android.) | |
* | |
* NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because | |
* this is not possible with certain compilers (Oracle SUN OS CC), as a result | |
* it is necessary to ensure that all extern functions that *might* be used | |
* regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ | |
* below is one example of this behavior because it is controlled by the | |
* presence or not of -mfpu=neon on the GCC command line, it is possible to do | |
* this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely | |
* do this. | |
*/ | |
#ifndef PNG_ARM_NEON_OPT | |
/* ARM NEON optimizations are being controlled by the compiler settings, | |
* typically the target FPU. If the FPU has been set to NEON (-mfpu=neon | |
* with GCC) then the compiler will define __ARM_NEON__ and we can rely | |
* unconditionally on NEON instructions not crashing, otherwise we must | |
* disable use of NEON instructions: | |
*/ | |
# ifdef __ARM_NEON__ | |
# define PNG_ARM_NEON_OPT 2 | |
# else | |
# define PNG_ARM_NEON_OPT 0 | |
# endif | |
#endif | |
#if PNG_ARM_NEON_OPT > 0 | |
/* NEON optimizations are to be at least considered by libpng, so enable the | |
* callbacks to do this. | |
*/ | |
# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon | |
#endif | |
/* Is this a build of a DLL where compilation of the object modules requires | |
* different preprocessor settings to those required for a simple library? If | |
* so PNG_BUILD_DLL must be set. | |
* | |
* If libpng is used inside a DLL but that DLL does not export the libpng APIs | |
* PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a | |
* static library of libpng then link the DLL against that. | |
*/ | |
#ifndef PNG_BUILD_DLL | |
# ifdef DLL_EXPORT | |
/* This is set by libtool when files are compiled for a DLL; libtool | |
* always compiles twice, even on systems where it isn't necessary. Set | |
* PNG_BUILD_DLL in case it is necessary: | |
*/ | |
# define PNG_BUILD_DLL | |
# else | |
# ifdef _WINDLL | |
/* This is set by the Microsoft Visual Studio IDE in projects that | |
* build a DLL. It can't easily be removed from those projects (it | |
* isn't visible in the Visual Studio UI) so it is a fairly reliable | |
* indication that PNG_IMPEXP needs to be set to the DLL export | |
* attributes. | |
*/ | |
# define PNG_BUILD_DLL | |
# else | |
# ifdef __DLL__ | |
/* This is set by the Borland C system when compiling for a DLL | |
* (as above.) | |
*/ | |
# define PNG_BUILD_DLL | |
# else | |
/* Add additional compiler cases here. */ | |
# endif | |
# endif | |
# endif | |
#endif /* Setting PNG_BUILD_DLL if required */ | |
/* See pngconf.h for more details: the builder of the library may set this on | |
* the command line to the right thing for the specific compilation system or it | |
* may be automagically set above (at present we know of no system where it does | |
* need to be set on the command line.) | |
* | |
* PNG_IMPEXP must be set here when building the library to prevent pngconf.h | |
* setting it to the "import" setting for a DLL build. | |
*/ | |
#ifndef PNG_IMPEXP | |
# ifdef PNG_BUILD_DLL | |
# define PNG_IMPEXP PNG_DLL_EXPORT | |
# else | |
/* Not building a DLL, or the DLL doesn't require specific export | |
* definitions. | |
*/ | |
# define PNG_IMPEXP | |
# endif | |
#endif | |
/* No warnings for private or deprecated functions in the build: */ | |
#ifndef PNG_DEPRECATED | |
# define PNG_DEPRECATED | |
#endif | |
#ifndef PNG_PRIVATE | |
# define PNG_PRIVATE | |
#endif | |
/* Symbol preprocessing support. | |
* | |
* To enable listing global, but internal, symbols the following macros should | |
* always be used to declare an extern data or function object in this file. | |
*/ | |
#ifndef PNG_INTERNAL_DATA | |
# define PNG_INTERNAL_DATA(type, name, array) extern type name array | |
#endif | |
#ifndef PNG_INTERNAL_FUNCTION | |
# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ | |
extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) | |
#endif | |
/* If floating or fixed point APIs are disabled they may still be compiled | |
* internally. To handle this make sure they are declared as the appropriate | |
* internal extern function (otherwise the symbol prefixing stuff won't work and | |
* the functions will be used without definitions.) | |
* | |
* NOTE: although all the API functions are declared here they are not all | |
* actually built! Because the declarations are still made it is necessary to | |
* fake out types that they depend on. | |
*/ | |
#ifndef PNG_FP_EXPORT | |
# ifndef PNG_FLOATING_POINT_SUPPORTED | |
# define PNG_FP_EXPORT(ordinal, type, name, args)\ | |
PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); | |
# ifndef PNG_VERSION_INFO_ONLY | |
typedef struct png_incomplete png_double; | |
typedef png_double* png_doublep; | |
typedef const png_double* png_const_doublep; | |
typedef png_double** png_doublepp; | |
# endif | |
# endif | |
#endif | |
#ifndef PNG_FIXED_EXPORT | |
# ifndef PNG_FIXED_POINT_SUPPORTED | |
# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ | |
PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); | |
# endif | |
#endif | |
#include "png.h" | |
/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ | |
#ifndef PNG_DLL_EXPORT | |
# define PNG_DLL_EXPORT | |
#endif | |
/* SECURITY and SAFETY: | |
* | |
* By default libpng is built without any internal limits on image size, | |
* individual heap (png_malloc) allocations or the total amount of memory used. | |
* If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used | |
* (unless individually overridden). These limits are believed to be fairly | |
* safe, but builders of secure systems should verify the values against the | |
* real system capabilities. | |
*/ | |
#ifdef PNG_SAFE_LIMITS_SUPPORTED | |
/* 'safe' limits */ | |
# ifndef PNG_USER_WIDTH_MAX | |
# define PNG_USER_WIDTH_MAX 1000000 | |
# endif | |
# ifndef PNG_USER_HEIGHT_MAX | |
# define PNG_USER_HEIGHT_MAX 1000000 | |
# endif | |
# ifndef PNG_USER_CHUNK_CACHE_MAX | |
# define PNG_USER_CHUNK_CACHE_MAX 128 | |
# endif | |
# ifndef PNG_USER_CHUNK_MALLOC_MAX | |
# define PNG_USER_CHUNK_MALLOC_MAX 8000000 | |
# endif | |
#else | |
/* values for no limits */ | |
# ifndef PNG_USER_WIDTH_MAX | |
# define PNG_USER_WIDTH_MAX 0x7fffffff | |
# endif | |
# ifndef PNG_USER_HEIGHT_MAX | |
# define PNG_USER_HEIGHT_MAX 0x7fffffff | |
# endif | |
# ifndef PNG_USER_CHUNK_CACHE_MAX | |
# define PNG_USER_CHUNK_CACHE_MAX 0 | |
# endif | |
# ifndef PNG_USER_CHUNK_MALLOC_MAX | |
# define PNG_USER_CHUNK_MALLOC_MAX 0 | |
# endif | |
#endif | |
/* Moved to pngpriv.h at libpng-1.5.0 */ | |
/* NOTE: some of these may have been used in external applications as | |
* these definitions were exposed in pngconf.h prior to 1.5. | |
*/ | |
/* If you are running on a machine where you cannot allocate more | |
* than 64K of memory at once, uncomment this. While libpng will not | |
* normally need that much memory in a chunk (unless you load up a very | |
* large file), zlib needs to know how big of a chunk it can use, and | |
* libpng thus makes sure to check any memory allocation to verify it | |
* will fit into memory. | |
* | |
* zlib provides 'MAXSEG_64K' which, if defined, indicates the | |
* same limit and pngconf.h (already included) sets the limit | |
* if certain operating systems are detected. | |
*/ | |
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) | |
# define PNG_MAX_MALLOC_64K | |
#endif | |
#ifndef PNG_UNUSED | |
/* Unused formal parameter warnings are silenced using the following macro | |
* which is expected to have no bad effects on performance (optimizing | |
* compilers will probably remove it entirely). Note that if you replace | |
* it with something other than whitespace, you must include the terminating | |
* semicolon. | |
*/ | |
# define PNG_UNUSED(param) (void)param; | |
#endif | |
/* Just a little check that someone hasn't tried to define something | |
* contradictory. | |
*/ | |
#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) | |
# undef PNG_ZBUF_SIZE | |
# define PNG_ZBUF_SIZE 65536L | |
#endif | |
/* If warnings or errors are turned off the code is disabled or redirected here. | |
* From 1.5.4 functions have been added to allow very limited formatting of | |
* error and warning messages - this code will also be disabled here. | |
*/ | |
#ifdef PNG_WARNINGS_SUPPORTED | |
# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; | |
#else | |
# define png_warning(s1,s2) ((void)(s1)) | |
# define png_chunk_warning(s1,s2) ((void)(s1)) | |
# define png_warning_parameter(p,number,string) ((void)0) | |
# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) | |
# define png_warning_parameter_signed(p,number,format,value) ((void)0) | |
# define png_formatted_warning(pp,p,message) ((void)(pp)) | |
# define PNG_WARNING_PARAMETERS(p) | |
#endif | |
#ifndef PNG_ERROR_TEXT_SUPPORTED | |
# define png_error(s1,s2) png_err(s1) | |
# define png_chunk_error(s1,s2) png_err(s1) | |
# define png_fixed_error(s1,s2) png_err(s1) | |
#endif | |
/* C allows up-casts from (void*) to any pointer and (const void*) to any | |
* pointer to a const object. C++ regards this as a type error and requires an | |
* explicit, static, cast and provides the static_cast<> rune to ensure that | |
* const is not cast away. | |
*/ | |
#ifdef __cplusplus | |
# define png_voidcast(type, value) static_cast<type>(value) | |
# define png_constcast(type, value) const_cast<type>(value) | |
# define png_aligncast(type, value) \ | |
static_cast<type>(static_cast<void*>(value)) | |
# define png_aligncastconst(type, value) \ | |
static_cast<type>(static_cast<const void*>(value)) | |
#else | |
# define png_voidcast(type, value) (value) | |
# define png_constcast(type, value) ((type)(value)) | |
# define png_aligncast(type, value) ((void*)(value)) | |
# define png_aligncastconst(type, value) ((const void*)(value)) | |
#endif /* __cplusplus */ | |
/* Some fixed point APIs are still required even if not exported because | |
* they get used by the corresponding floating point APIs. This magic | |
* deals with this: | |
*/ | |
#ifdef PNG_FIXED_POINT_SUPPORTED | |
# define PNGFAPI PNGAPI | |
#else | |
# define PNGFAPI /* PRIVATE */ | |
#endif | |
#ifndef PNG_VERSION_INFO_ONLY | |
/* Other defines specific to compilers can go here. Try to keep | |
* them inside an appropriate ifdef/endif pair for portability. | |
*/ | |
#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ | |
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) | |
/* png.c requires the following ANSI-C constants if the conversion of | |
* floating point to ASCII is implemented therein: | |
* | |
* DBL_DIG Maximum number of decimal digits (can be set to any constant) | |
* DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) | |
* DBL_MAX Maximum floating point number (can be set to an arbitrary value) | |
*/ | |
# include <float.h> | |
# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ | |
defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) | |
/* We need to check that <math.h> hasn't already been included earlier | |
* as it seems it doesn't agree with <fp.h>, yet we should really use | |
* <fp.h> if possible. | |
*/ | |
# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) | |
# include <fp.h> | |
# endif | |
# else | |
# include <math.h> | |
# endif | |
# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) | |
/* Amiga SAS/C: We must include builtin FPU functions when compiling using | |
* MATH=68881 | |
*/ | |
# include <m68881.h> | |
# endif | |
#endif | |
/* This provides the non-ANSI (far) memory allocation routines. */ | |
#if defined(__TURBOC__) && defined(__MSDOS__) | |
# include <mem.h> | |
# include <alloc.h> | |
#endif | |
#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ | |
defined(_WIN32) || defined(__WIN32__) | |
# include <windows.h> /* defines _WINDOWS_ macro */ | |
#endif | |
#endif /* PNG_VERSION_INFO_ONLY */ | |
/* Moved here around 1.5.0beta36 from pngconf.h */ | |
/* Users may want to use these so they are not private. Any library | |
* functions that are passed far data must be model-independent. | |
*/ | |
/* Memory model/platform independent fns */ | |
#ifndef PNG_ABORT | |
# ifdef _WINDOWS_ | |
# define PNG_ABORT() ExitProcess(0) | |
# else | |
# define PNG_ABORT() abort() | |
# endif | |
#endif | |
/* These macros may need to be architecture dependent. */ | |
#define PNG_ALIGN_NONE 0 /* do not use data alignment */ | |
#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ | |
#ifdef offsetof | |
# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ | |
#else | |
# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ | |
#endif | |
#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ | |
#ifndef PNG_ALIGN_TYPE | |
/* Default to using aligned access optimizations and requiring alignment to a | |
* multiple of the data type size. Override in a compiler specific fashion | |
* if necessary by inserting tests here: | |
*/ | |
# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE | |
#endif | |
#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE | |
/* This is used because in some compiler implementations non-aligned | |
* structure members are supported, so the offsetof approach below fails. | |
* Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access | |
* is good for performance. Do not do this unless you have tested the result | |
* and understand it. | |
*/ | |
# define png_alignof(type) (sizeof (type)) | |
#else | |
# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET | |
# define png_alignof(type) offsetof(struct{char c; type t;}, t) | |
# else | |
# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS | |
# define png_alignof(type) (1) | |
# endif | |
/* Else leave png_alignof undefined to prevent use thereof */ | |
# endif | |
#endif | |
/* This implicitly assumes alignment is always to a power of 2. */ | |
#ifdef png_alignof | |
# define png_isaligned(ptr, type)\ | |
((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) | |
#else | |
# define png_isaligned(ptr, type) 0 | |
#endif | |
/* End of memory model/platform independent support */ | |
/* End of 1.5.0beta36 move from pngconf.h */ | |
/* CONSTANTS and UTILITY MACROS | |
* These are used internally by libpng and not exposed in the API | |
*/ | |
/* Various modes of operation. Note that after an init, mode is set to | |
* zero automatically when the structure is created. Three of these | |
* are defined in png.h because they need to be visible to applications | |
* that call png_set_unknown_chunk(). | |
*/ | |
/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ | |
/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ | |
#define PNG_HAVE_IDAT 0x04 | |
/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ | |
#define PNG_HAVE_IEND 0x10 | |
/* 0x20 (unused) */ | |
/* 0x40 (unused) */ | |
/* 0x80 (unused) */ | |
#define PNG_HAVE_CHUNK_HEADER 0x100 | |
#define PNG_WROTE_tIME 0x200 | |
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 | |
#define PNG_BACKGROUND_IS_GRAY 0x800 | |
#define PNG_HAVE_PNG_SIGNATURE 0x1000 | |
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ | |
/* 0x4000 (unused) */ | |
#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ | |
/* Flags for the transformations the PNG library does on the image data */ | |
#define PNG_BGR 0x0001 | |
#define PNG_INTERLACE 0x0002 | |
#define PNG_PACK 0x0004 | |
#define PNG_SHIFT 0x0008 | |
#define PNG_SWAP_BYTES 0x0010 | |
#define PNG_INVERT_MONO 0x0020 | |
#define PNG_QUANTIZE 0x0040 | |
#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ | |
#define PNG_BACKGROUND_EXPAND 0x0100 | |
#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ | |
#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ | |
#define PNG_RGBA 0x0800 | |
#define PNG_EXPAND 0x1000 | |
#define PNG_GAMMA 0x2000 | |
#define PNG_GRAY_TO_RGB 0x4000 | |
#define PNG_FILLER 0x8000 | |
#define PNG_PACKSWAP 0x10000 | |
#define PNG_SWAP_ALPHA 0x20000 | |
#define PNG_STRIP_ALPHA 0x40000 | |
#define PNG_INVERT_ALPHA 0x80000 | |
#define PNG_USER_TRANSFORM 0x100000 | |
#define PNG_RGB_TO_GRAY_ERR 0x200000 | |
#define PNG_RGB_TO_GRAY_WARN 0x400000 | |
#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ | |
#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ | |
#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ | |
#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ | |
#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ | |
/* 0x8000000 unused */ | |
/* 0x10000000 unused */ | |
/* 0x20000000 unused */ | |
/* 0x40000000 unused */ | |
/* Flags for png_create_struct */ | |
#define PNG_STRUCT_PNG 0x0001 | |
#define PNG_STRUCT_INFO 0x0002 | |
/* Scaling factor for filter heuristic weighting calculations */ | |
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) | |
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) | |
/* Flags for the png_ptr->flags rather than declaring a byte for each one */ | |
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 | |
#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ | |
/* 0x0004 unused */ | |
#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ | |
/* 0x0010 unused */ | |
/* 0x0020 unused */ | |
#define PNG_FLAG_ROW_INIT 0x0040 | |
#define PNG_FLAG_FILLER_AFTER 0x0080 | |
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 | |
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 | |
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 | |
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 | |
#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ | |
#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ | |
#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ | |
/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ | |
/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ | |
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000 | |
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 | |
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 | |
#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ | |
#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ | |
#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ | |
/* 0x800000 unused */ | |
/* 0x1000000 unused */ | |
/* 0x2000000 unused */ | |
/* 0x4000000 unused */ | |
/* 0x8000000 unused */ | |
/* 0x10000000 unused */ | |
/* 0x20000000 unused */ | |
/* 0x40000000 unused */ | |
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ | |
PNG_FLAG_CRC_ANCILLARY_NOWARN) | |
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ | |
PNG_FLAG_CRC_CRITICAL_IGNORE) | |
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ | |
PNG_FLAG_CRC_CRITICAL_MASK) | |
/* Save typing and make code easier to understand */ | |
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ | |
abs((int)((c1).green) - (int)((c2).green)) + \ | |
abs((int)((c1).blue) - (int)((c2).blue))) | |
/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 | |
* by dividing by 257 *with rounding*. This macro is exact for the given range. | |
* See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the | |
* macro were established by experiment (modifying the added value). The macro | |
* has a second variant that takes a value already scaled by 255 and divides by | |
* 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it | |
* only gives off-by-one errors and only for 0.5% (1 in 200) of the values. | |
*/ | |
#define PNG_DIV65535(v24) (((v24) + 32895) >> 16) | |
#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) | |
/* Added to libpng-1.2.6 JB */ | |
#define PNG_ROWBYTES(pixel_bits, width) \ | |
((pixel_bits) >= 8 ? \ | |
((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ | |
(( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) | |
/* PNG_OUT_OF_RANGE returns true if value is outside the range | |
* ideal-delta..ideal+delta. Each argument is evaluated twice. | |
* "ideal" and "delta" should be constants, normally simple | |
* integers, "value" a variable. Added to libpng-1.2.6 JB | |
*/ | |
#define PNG_OUT_OF_RANGE(value, ideal, delta) \ | |
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) | |
/* Conversions between fixed and floating point, only defined if | |
* required (to make sure the code doesn't accidentally use float | |
* when it is supposedly disabled.) | |
*/ | |
#ifdef PNG_FLOATING_POINT_SUPPORTED | |
/* The floating point conversion can't overflow, though it can and | |
* does lose accuracy relative to the original fixed point value. | |
* In practice this doesn't matter because png_fixed_point only | |
* stores numbers with very low precision. The png_ptr and s | |
* arguments are unused by default but are there in case error | |
* checking becomes a requirement. | |
*/ | |
#define png_float(png_ptr, fixed, s) (.00001 * (fixed)) | |
/* The fixed point conversion performs range checking and evaluates | |
* its argument multiple times, so must be used with care. The | |
* range checking uses the PNG specification values for a signed | |
* 32 bit fixed point value except that the values are deliberately | |
* rounded-to-zero to an integral value - 21474 (21474.83 is roughly | |
* (2^31-1) * 100000). 's' is a string that describes the value being | |
* converted. | |
* | |
* NOTE: this macro will raise a png_error if the range check fails, | |
* therefore it is normally only appropriate to use this on values | |
* that come from API calls or other sources where an out of range | |
* error indicates a programming error, not a data error! | |
* | |
* NOTE: by default this is off - the macro is not used - because the | |
* function call saves a lot of code. | |
*/ | |
#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED | |
#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ | |
((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) | |
#endif | |
/* else the corresponding function is defined below, inside the scope of the | |
* cplusplus test. | |
*/ | |
#endif | |
/* Constants for known chunk types. If you need to add a chunk, define the name | |
* here. For historical reasons these constants have the form png_<name>; i.e. | |
* the prefix is lower case. Please use decimal values as the parameters to | |
* match the ISO PNG specification and to avoid relying on the C locale | |
* interpretation of character values. | |
* | |
* Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values | |
* are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string | |
* to be generated if required. | |
* | |
* PNG_32b correctly produces a value shifted by up to 24 bits, even on | |
* architectures where (int) is only 16 bits. | |
*/ | |
#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) | |
#define PNG_U32(b1,b2,b3,b4) \ | |
(PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) | |
/* Constants for known chunk types. | |
* | |
* MAINTAINERS: If you need to add a chunk, define the name here. | |
* For historical reasons these constants have the form png_<name>; i.e. | |
* the prefix is lower case. Please use decimal values as the parameters to | |
* match the ISO PNG specification and to avoid relying on the C locale | |
* interpretation of character values. Please keep the list sorted. | |
* | |
* Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk | |
* type. In fact the specification does not express chunk types this way, | |
* however using a 32-bit value means that the chunk type can be read from the | |
* stream using exactly the same code as used for a 32-bit unsigned value and | |
* can be examined far more efficiently (using one arithmetic compare). | |
* | |
* Prior to 1.5.6 the chunk type constants were expressed as C strings. The | |
* libpng API still uses strings for 'unknown' chunks and a macro, | |
* PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice | |
* that for portable code numeric values must still be used; the string "IHDR" | |
* is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). | |
* | |
* In 1.7.0 the definitions will be made public in png.h to avoid having to | |
* duplicate the same definitions in application code. | |
*/ | |
#define png_IDAT PNG_U32( 73, 68, 65, 84) | |
#define png_IEND PNG_U32( 73, 69, 78, 68) | |
#define png_IHDR PNG_U32( 73, 72, 68, 82) | |
#define png_PLTE PNG_U32( 80, 76, 84, 69) | |
#define png_bKGD PNG_U32( 98, 75, 71, 68) | |
#define png_cHRM PNG_U32( 99, 72, 82, 77) | |
#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ | |
#define png_gAMA PNG_U32(103, 65, 77, 65) | |
#define png_gIFg PNG_U32(103, 73, 70, 103) | |
#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ | |
#define png_gIFx PNG_U32(103, 73, 70, 120) | |
#define png_hIST PNG_U32(104, 73, 83, 84) | |
#define png_iCCP PNG_U32(105, 67, 67, 80) | |
#define png_iTXt PNG_U32(105, 84, 88, 116) | |
#define png_oFFs PNG_U32(111, 70, 70, 115) | |
#define png_pCAL PNG_U32(112, 67, 65, 76) | |
#define png_pHYs PNG_U32(112, 72, 89, 115) | |
#define png_sBIT PNG_U32(115, 66, 73, 84) | |
#define png_sCAL PNG_U32(115, 67, 65, 76) | |
#define png_sPLT PNG_U32(115, 80, 76, 84) | |
#define png_sRGB PNG_U32(115, 82, 71, 66) | |
#define png_sTER PNG_U32(115, 84, 69, 82) | |
#define png_tEXt PNG_U32(116, 69, 88, 116) | |
#define png_tIME PNG_U32(116, 73, 77, 69) | |
#define png_tRNS PNG_U32(116, 82, 78, 83) | |
#define png_zTXt PNG_U32(122, 84, 88, 116) | |
/* The following will work on (signed char*) strings, whereas the get_uint_32 | |
* macro will fail on top-bit-set values because of the sign extension. | |
*/ | |
#define PNG_CHUNK_FROM_STRING(s)\ | |
PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) | |
/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is | |
* signed and the argument is a (char[]) This macro will fail miserably on | |
* systems where (char) is more than 8 bits. | |
*/ | |
#define PNG_STRING_FROM_CHUNK(s,c)\ | |
(void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ | |
((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) | |
/* Do the same but terminate with a null character. */ | |
#define PNG_CSTRING_FROM_CHUNK(s,c)\ | |
(void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) | |
/* Test on flag values as defined in the spec (section 5.4): */ | |
#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) | |
#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) | |
#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) | |
#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) | |
#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) | |
/* Gamma values (new at libpng-1.5.4): */ | |
#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ | |
#define PNG_GAMMA_MAC_INVERSE 65909 | |
#define PNG_GAMMA_sRGB_INVERSE 45455 | |
/* Almost everything below is C specific; the #defines above can be used in | |
* non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. | |
*/ | |
#ifndef PNG_VERSION_INFO_ONLY | |
#include "pngstruct.h" | |
#include "pnginfo.h" | |
/* Validate the include paths - the include path used to generate pnglibconf.h | |
* must match that used in the build, or we must be using pnglibconf.h.prebuilt: | |
*/ | |
#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM | |
# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ | |
"-I (include path) error: see the notes in pngpriv.h" | |
/* This means that when pnglibconf.h was built the copy of zlib.h that it | |
* used is not the same as the one being used here. Because the build of | |
* libpng makes decisions to use inflateInit2 and inflateReset2 based on the | |
* zlib version number and because this affects handling of certain broken | |
* PNG files the -I directives must match. | |
* | |
* The most likely explanation is that you passed a -I in CFLAGS, this will | |
* not work; all the preprocessor directories and in particular all the -I | |
* directives must be in CPPFLAGS. | |
*/ | |
#endif | |
/* This is used for 16 bit gamma tables -- only the top level pointers are | |
* const; this could be changed: | |
*/ | |
typedef const png_uint_16p * png_const_uint_16pp; | |
/* Added to libpng-1.5.7: sRGB conversion tables */ | |
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ | |
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) | |
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED | |
PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); | |
/* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, | |
* 0..65535. This table gives the closest 16-bit answers (no errors). | |
*/ | |
#endif | |
PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); | |
PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); | |
#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ | |
((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) | |
/* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB | |
* encoded value with maximum error 0.646365. Note that the input is not a | |
* 16-bit value; it has been multiplied by 255! */ | |
#endif /* PNG_SIMPLIFIED_READ/WRITE */ | |
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ | |
#ifdef __cplusplus | |
extern "C" { | |
#endif /* __cplusplus */ | |
/* Internal functions; these are not exported from a DLL however because they | |
* are used within several of the C source files they have to be C extern. | |
* | |
* All of these functions must be declared with PNG_INTERNAL_FUNCTION. | |
*/ | |
/* Zlib support */ | |
#define PNG_UNEXPECTED_ZLIB_RETURN (-7) | |
PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), | |
PNG_EMPTY); | |
/* Used by the zlib handling functions to ensure that z_stream::msg is always | |
* set before they return. | |
*/ | |
#ifdef PNG_WRITE_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, | |
png_compression_bufferp *list),PNG_EMPTY); | |
/* Free the buffer list used by the compressed write code. */ | |
#endif | |
#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ | |
!defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ | |
(defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ | |
defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ | |
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ | |
(defined(PNG_sCAL_SUPPORTED) && \ | |
defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) | |
PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, | |
double fp, png_const_charp text),PNG_EMPTY); | |
#endif | |
/* Check the user version string for compatibility, returns false if the version | |
* numbers aren't compatible. | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, | |
png_const_charp user_png_ver),PNG_EMPTY); | |
/* Internal base allocator - no messages, NULL on failure to allocate. This | |
* does, however, call the application provided allocator and that could call | |
* png_error (although that would be a bug in the application implementation.) | |
*/ | |
PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, | |
png_alloc_size_t size),PNG_ALLOCATED); | |
#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ | |
defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) | |
/* Internal array allocator, outputs no error or warning messages on failure, | |
* just returns NULL. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, | |
int nelements, size_t element_size),PNG_ALLOCATED); | |
/* The same but an existing array is extended by add_elements. This function | |
* also memsets the new elements to 0 and copies the old elements. The old | |
* array is not freed or altered. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, | |
png_const_voidp array, int old_elements, int add_elements, | |
size_t element_size),PNG_ALLOCATED); | |
#endif /* text, sPLT or unknown chunks */ | |
/* Magic to create a struct when there is no struct to call the user supplied | |
* memory allocators. Because error handling has not been set up the memory | |
* handlers can't safely call png_error, but this is an obscure and undocumented | |
* restriction so libpng has to assume that the 'free' handler, at least, might | |
* call png_error. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, | |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | |
png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, | |
png_free_ptr free_fn),PNG_ALLOCATED); | |
/* Free memory from internal libpng struct */ | |
PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* Free an allocated jmp_buf (always succeeds) */ | |
PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); | |
/* Function to allocate memory for zlib. PNGAPI is disallowed. */ | |
PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), | |
PNG_ALLOCATED); | |
/* Function to free memory for zlib. PNGAPI is disallowed. */ | |
PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); | |
/* Next four functions are used internally as callbacks. PNGCBAPI is required | |
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to | |
* PNGCBAPI at 1.5.0 | |
*/ | |
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, | |
png_bytep data, png_size_t length),PNG_EMPTY); | |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, | |
png_bytep buffer, png_size_t length),PNG_EMPTY); | |
#endif | |
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, | |
png_bytep data, png_size_t length),PNG_EMPTY); | |
#ifdef PNG_WRITE_FLUSH_SUPPORTED | |
# ifdef PNG_STDIO_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), | |
PNG_EMPTY); | |
# endif | |
#endif | |
/* Reset the CRC variable */ | |
PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); | |
/* Write the "data" buffer to whatever output you are using */ | |
PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, | |
png_const_bytep data, png_size_t length),PNG_EMPTY); | |
/* Read and check the PNG file signature */ | |
PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
/* Read the chunk header (length + type name) */ | |
PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* Read data from whatever input you are using into the "data" buffer */ | |
PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, | |
png_size_t length),PNG_EMPTY); | |
/* Read bytes into buf, and update png_ptr->crc */ | |
PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, | |
png_uint_32 length),PNG_EMPTY); | |
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ | |
PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, | |
png_uint_32 skip),PNG_EMPTY); | |
/* Read the CRC from the file and compare it to the libpng calculated CRC */ | |
PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); | |
/* Calculate the CRC over a section of data. Note that we are only | |
* passing a maximum of 64K on systems that have this as a memory limit, | |
* since this is the maximum buffer size we can specify. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, | |
png_const_bytep ptr, png_size_t length),PNG_EMPTY); | |
#ifdef PNG_WRITE_FLUSH_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); | |
#endif | |
/* Write various chunks */ | |
/* Write the IHDR chunk, and update the png_struct with the necessary | |
* information. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, | |
png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, | |
int compression_method, int filter_method, int interlace_method),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, | |
png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, | |
png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); | |
#ifdef PNG_WRITE_gAMA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, | |
png_fixed_point file_gamma),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_sBIT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, | |
png_const_color_8p sbit, int color_type),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_cHRM_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, | |
const png_xy *xy), PNG_EMPTY); | |
/* The xy value must have been previously validated */ | |
#endif | |
#ifdef PNG_WRITE_sRGB_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, | |
int intent),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_iCCP_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, | |
png_const_charp name, png_const_bytep profile), PNG_EMPTY); | |
/* The profile must have been previously validated for correctness, the | |
* length comes from the first four bytes. Only the base, deflate, | |
* compression is supported. | |
*/ | |
#endif | |
#ifdef PNG_WRITE_sPLT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, | |
png_const_sPLT_tp palette),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_tRNS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, | |
png_const_bytep trans, png_const_color_16p values, int number, | |
int color_type),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_bKGD_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, | |
png_const_color_16p values, int color_type),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_hIST_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, | |
png_const_uint_16p hist, int num_hist),PNG_EMPTY); | |
#endif | |
/* Chunks that have keywords */ | |
#ifdef PNG_WRITE_tEXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, | |
png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_zTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp | |
key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_iTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, | |
int compression, png_const_charp key, png_const_charp lang, | |
png_const_charp lang_key, png_const_charp text),PNG_EMPTY); | |
#endif | |
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ | |
PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, | |
png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_oFFs_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, | |
png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_pCAL_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, | |
png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, | |
png_const_charp units, png_charpp params),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_pHYs_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, | |
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, | |
int unit_type),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_tIME_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, | |
png_const_timep mod_time),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_sCAL_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, | |
int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); | |
#endif | |
/* Called when finished processing a row of data */ | |
PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* Internal use only. Called before first row of data */ | |
PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an | |
* array of png_ptr->width pixels. If the image is not interlaced or this | |
* is the final pass this just does a memcpy, otherwise the "display" flag | |
* is used to determine whether to copy pixels that are not in the current pass. | |
* | |
* Because 'png_do_read_interlace' (below) replicates pixels this allows this | |
* function to achieve the documented 'blocky' appearance during interlaced read | |
* if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' | |
* are not changed if they are not in the current pass, when display is 0. | |
* | |
* 'display' must be 0 or 1, otherwise the memcpy will be done regardless. | |
* | |
* The API always reads from the png_struct row buffer and always assumes that | |
* it is full width (png_do_read_interlace has already been called.) | |
* | |
* This function is only ever used to write to row buffers provided by the | |
* caller of the relevant libpng API and the row must have already been | |
* transformed by the read transformations. | |
* | |
* The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed | |
* bitmasks for use within the code, otherwise runtime generated masks are used. | |
* The default is compile time masks. | |
*/ | |
#ifndef PNG_USE_COMPILE_TIME_MASKS | |
# define PNG_USE_COMPILE_TIME_MASKS 1 | |
#endif | |
PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, | |
png_bytep row, int display),PNG_EMPTY); | |
#ifdef PNG_READ_INTERLACING_SUPPORTED | |
/* Expand an interlaced row: the 'row_info' describes the pass data that has | |
* been read in and must correspond to the pixels in 'row', the pixels are | |
* expanded (moved apart) in 'row' to match the final layout, when doing this | |
* the pixels are *replicated* to the intervening space. This is essential for | |
* the correct operation of png_combine_row, above. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, | |
png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); | |
#endif | |
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ | |
#ifdef PNG_WRITE_INTERLACING_SUPPORTED | |
/* Grab pixels out of a row for an interlaced pass */ | |
PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, | |
png_bytep row, int pass),PNG_EMPTY); | |
#endif | |
/* Unfilter a row: check the filter value before calling this, there is no point | |
* calling it for PNG_FILTER_VALUE_NONE. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, | |
png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop | |
row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); | |
/* Choose the best filter to use and filter the row data */ | |
PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, | |
png_row_infop row_info),PNG_EMPTY); | |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, | |
png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); | |
/* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer | |
* is NULL the function checks, instead, for the end of the stream. In this | |
* case a benign error will be issued if the stream end is not found or if | |
* extra data has to be consumed. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* This cleans up when the IDAT LZ stream does not end when the last image | |
* byte is read; there is still some pending input. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), | |
PNG_EMPTY); | |
/* Finish a row while reading, dealing with interlacing passes, etc. */ | |
#endif | |
/* Initialize the row buffers, etc. */ | |
PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); | |
#ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
/* Optional call to update the users info structure */ | |
PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
#endif | |
/* These are the functions that do the transformations */ | |
#ifdef PNG_READ_FILLER_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, | |
png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ | |
defined(PNG_READ_STRIP_ALPHA_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, | |
png_bytep row, int at_start),PNG_EMPTY); | |
#endif | |
#ifdef PNG_16BIT_SUPPORTED | |
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#endif | |
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ | |
defined(PNG_WRITE_PACKSWAP_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | |
PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, | |
png_row_infop row_info, png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_PACK_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_SHIFT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, | |
png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); | |
#endif | |
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_QUANTIZE_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, | |
png_bytep row, png_const_bytep palette_lookup, | |
png_const_bytep quantize_lookup),PNG_EMPTY); | |
# ifdef PNG_CORRECT_PALETTE_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, | |
png_colorp palette, int num_palette),PNG_EMPTY); | |
# endif | |
#endif | |
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_PACK_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, | |
png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_SHIFT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, | |
png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); | |
#endif | |
#if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ | |
defined(PNG_READ_ALPHA_MODE_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, | |
png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_GAMMA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, | |
png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_ALPHA_MODE_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, | |
png_bytep row, png_structrp png_ptr),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_EXPAND_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, | |
png_bytep row, png_const_colorp palette, png_const_bytep trans, | |
int num_trans),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, | |
png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_EXPAND_16_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
/* The following decodes the appropriate chunks, and does error correction, | |
* then calls the appropriate callback for the chunk if it is valid. | |
*/ | |
/* Decode the IHDR chunk */ | |
PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#ifdef PNG_READ_bKGD_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_cHRM_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_gAMA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_hIST_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_iCCP_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif /* PNG_READ_iCCP_SUPPORTED */ | |
#ifdef PNG_READ_iTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_oFFs_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_pCAL_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_pHYs_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_sBIT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_sCAL_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_sPLT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif /* PNG_READ_sPLT_SUPPORTED */ | |
#ifdef PNG_READ_sRGB_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_tEXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_tIME_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_tRNS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_zTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
#endif | |
PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, | |
png_uint_32 chunk_name),PNG_EMPTY); | |
#ifdef PNG_READ_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); | |
/* This is the function that gets called for unknown chunks. The 'keep' | |
* argument is either non-zero for a known chunk that has been set to be | |
* handled as unknown or zero for an unknown chunk. By default the function | |
* just skips the chunk or errors out if it is critical. | |
*/ | |
#ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED | |
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, | |
(png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); | |
/* Exactly as the API png_handle_as_unknown() except that the argument is a | |
* 32-bit chunk name, not a string. | |
*/ | |
#endif | |
#endif /* PNG_READ_UNKNOWN_CHUNKS_SUPPORTED */ | |
#endif /* PNG_READ_SUPPORTED */ | |
/* Handle the transformations for reading and writing */ | |
#ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, | |
png_row_infop row_info),PNG_EMPTY); | |
#endif | |
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, | |
png_row_infop row_info),PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_TRANSFORMS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), | |
PNG_EMPTY); | |
#endif | |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, | |
png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, | |
png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, | |
png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, | |
png_bytep row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), | |
PNG_EMPTY); | |
# ifdef PNG_READ_tEXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
# endif | |
# ifdef PNG_READ_zTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
# endif | |
# ifdef PNG_READ_iTXt_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, | |
png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, | |
png_inforp info_ptr),PNG_EMPTY); | |
# endif | |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ | |
#ifdef PNG_MNG_FEATURES_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, | |
png_bytep row),PNG_EMPTY); | |
#endif | |
/* Added at libpng version 1.6.0 */ | |
#ifdef PNG_GAMMA_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); | |
/* Set the colorspace gamma with a value provided by the application or by | |
* the gAMA chunk on read. The value will override anything set by an ICC | |
* profile. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, | |
png_inforp info_ptr), PNG_EMPTY); | |
/* Synchronize the info 'valid' flags with the colorspace */ | |
PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, | |
png_inforp info_ptr), PNG_EMPTY); | |
/* Copy the png_struct colorspace to the info_struct and call the above to | |
* synchronize the flags. Checks for NULL info_ptr and does nothing. | |
*/ | |
#endif | |
/* Added at libpng version 1.4.0 */ | |
#ifdef PNG_COLORSPACE_SUPPORTED | |
/* These internal functions are for maintaining the colorspace structure within | |
* a png_info or png_struct (or, indeed, both). | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, | |
(png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, | |
int preferred), PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, | |
(png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, | |
int preferred), PNG_EMPTY); | |
#ifdef PNG_sRGB_SUPPORTED | |
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, int intent), PNG_EMPTY); | |
/* This does set the colorspace gAMA and cHRM values too, but doesn't set the | |
* flags to write them, if it returns false there was a problem and an error | |
* message has already been output (but the colorspace may still need to be | |
* synced to record the invalid flag). | |
*/ | |
#endif /* sRGB */ | |
#ifdef PNG_iCCP_SUPPORTED | |
PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, png_const_charp name, | |
png_uint_32 profile_length, png_const_bytep profile, int color_type), | |
PNG_EMPTY); | |
/* The 'name' is used for information only */ | |
/* Routines for checking parts of an ICC profile. */ | |
PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, png_const_charp name, | |
png_uint_32 profile_length), PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, png_const_charp name, | |
png_uint_32 profile_length, | |
png_const_bytep profile /* first 132 bytes only */, int color_type), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, | |
png_colorspacerp colorspace, png_const_charp name, | |
png_uint_32 profile_length, | |
png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); | |
#ifdef PNG_sRGB_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( | |
png_const_structrp png_ptr, png_colorspacerp colorspace, | |
png_const_bytep profile, uLong adler), PNG_EMPTY); | |
/* 'adler' is the Adler32 checksum of the uncompressed profile data. It may | |
* be zero to indicate that it is not available. It is used, if provided, | |
* as a fast check on the profile when checking to see if it is sRGB. | |
*/ | |
#endif | |
#endif /* iCCP */ | |
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, | |
(png_structrp png_ptr), PNG_EMPTY); | |
/* Set the rgb_to_gray coefficients from the colorspace Y values */ | |
#endif /* READ_RGB_TO_GRAY */ | |
#endif /* COLORSPACE */ | |
/* Added at libpng version 1.4.0 */ | |
PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, | |
png_uint_32 width, png_uint_32 height, int bit_depth, | |
int color_type, int interlace_type, int compression_type, | |
int filter_type),PNG_EMPTY); | |
/* Added at libpng version 1.5.10 */ | |
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ | |
defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, | |
(png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); | |
#endif | |
#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) | |
PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, | |
png_const_charp name),PNG_NORETURN); | |
#endif | |
/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite | |
* the end. Always leaves the buffer nul terminated. Never errors out (and | |
* there is no error code.) | |
*/ | |
PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, | |
size_t pos, png_const_charp string),PNG_EMPTY); | |
/* Various internal functions to handle formatted warning messages, currently | |
* only implemented for warnings. | |
*/ | |
#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) | |
/* Utility to dump an unsigned value into a buffer, given a start pointer and | |
* and end pointer (which should point just *beyond* the end of the buffer!) | |
* Returns the pointer to the start of the formatted string. This utility only | |
* does unsigned values. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, | |
png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); | |
/* Convenience macro that takes an array: */ | |
#define PNG_FORMAT_NUMBER(buffer,format,number) \ | |
png_format_number(buffer, buffer + (sizeof buffer), format, number) | |
/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ | |
#define PNG_NUMBER_BUFFER_SIZE 24 | |
/* These are the integer formats currently supported, the name is formed from | |
* the standard printf(3) format string. | |
*/ | |
#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ | |
#define PNG_NUMBER_FORMAT_02u 2 | |
#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ | |
#define PNG_NUMBER_FORMAT_02d 2 | |
#define PNG_NUMBER_FORMAT_x 3 | |
#define PNG_NUMBER_FORMAT_02x 4 | |
#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ | |
#endif | |
#ifdef PNG_WARNINGS_SUPPORTED | |
/* New defines and members adding in libpng-1.5.4 */ | |
# define PNG_WARNING_PARAMETER_SIZE 32 | |
# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ | |
/* An l-value of this type has to be passed to the APIs below to cache the | |
* values of the parameters to a formatted warning message. | |
*/ | |
typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ | |
PNG_WARNING_PARAMETER_SIZE]; | |
PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, | |
int number, png_const_charp string),PNG_EMPTY); | |
/* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, | |
* including the trailing '\0'. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, | |
(png_warning_parameters p, int number, int format, png_alloc_size_t value), | |
PNG_EMPTY); | |
/* Use png_alloc_size_t because it is an unsigned type as big as any we | |
* need to output. Use the following for a signed value. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, | |
(png_warning_parameters p, int number, int format, png_int_32 value), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, | |
png_warning_parameters p, png_const_charp message),PNG_EMPTY); | |
/* 'message' follows the X/Open approach of using @1, @2 to insert | |
* parameters previously supplied using the above functions. Errors in | |
* specifying the parameters will simply result in garbage substitutions. | |
*/ | |
#endif | |
#ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
/* Application errors (new in 1.6); use these functions (declared below) for | |
* errors in the parameters or order of API function calls on read. The | |
* 'warning' should be used for an error that can be handled completely; the | |
* 'error' for one which can be handled safely but which may lose application | |
* information or settings. | |
* | |
* By default these both result in a png_error call prior to release, while in a | |
* released version the 'warning' is just a warning. However if the application | |
* explicitly disables benign errors (explicitly permitting the code to lose | |
* information) they both turn into warnings. | |
* | |
* If benign errors aren't supported they end up as the corresponding base call | |
* (png_warning or png_error.) | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, | |
png_const_charp message),PNG_EMPTY); | |
/* The application provided invalid parameters to an API function or called | |
* an API function at the wrong time, libpng can completely recover. | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, | |
png_const_charp message),PNG_EMPTY); | |
/* As above but libpng will ignore the call, or attempt some other partial | |
* recovery from the error. | |
*/ | |
#else | |
# define png_app_warning(pp,s) png_warning(pp,s) | |
# define png_app_error(pp,s) png_error(pp,s) | |
#endif | |
PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, | |
png_const_charp message, int error),PNG_EMPTY); | |
/* Report a recoverable issue in chunk data. On read this is used to report | |
* a problem found while reading a particular chunk and the | |
* png_chunk_benign_error or png_chunk_warning function is used as | |
* appropriate. On write this is used to report an error that comes from | |
* data set via an application call to a png_set_ API and png_app_error or | |
* png_app_warning is used as appropriate. | |
* | |
* The 'error' parameter must have one of the following values: | |
*/ | |
#define PNG_CHUNK_WARNING 0 /* never an error */ | |
#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ | |
#define PNG_CHUNK_ERROR 2 /* always an error */ | |
/* ASCII to FP interfaces, currently only implemented if sCAL | |
* support is required. | |
*/ | |
#if defined(PNG_sCAL_SUPPORTED) | |
/* MAX_DIGITS is actually the maximum number of characters in an sCAL | |
* width or height, derived from the precision (number of significant | |
* digits - a build time settable option) and assumptions about the | |
* maximum ridiculous exponent. | |
*/ | |
#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) | |
#ifdef PNG_FLOATING_POINT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, | |
png_charp ascii, png_size_t size, double fp, unsigned int precision), | |
PNG_EMPTY); | |
#endif /* FLOATING_POINT */ | |
#ifdef PNG_FIXED_POINT_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, | |
png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); | |
#endif /* FIXED_POINT */ | |
#endif /* sCAL */ | |
#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) | |
/* An internal API to validate the format of a floating point number. | |
* The result is the index of the next character. If the number is | |
* not valid it will be the index of a character in the supposed number. | |
* | |
* The format of a number is defined in the PNG extensions specification | |
* and this API is strictly conformant to that spec, not anyone elses! | |
* | |
* The format as a regular expression is: | |
* | |
* [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? | |
* | |
* or: | |
* | |
* [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? | |
* | |
* The complexity is that either integer or fraction must be present and the | |
* fraction is permitted to have no digits only if the integer is present. | |
* | |
* NOTE: The dangling E problem. | |
* There is a PNG valid floating point number in the following: | |
* | |
* PNG floating point numbers are not greedy. | |
* | |
* Working this out requires *TWO* character lookahead (because of the | |
* sign), the parser does not do this - it will fail at the 'r' - this | |
* doesn't matter for PNG sCAL chunk values, but it requires more care | |
* if the value were ever to be embedded in something more complex. Use | |
* ANSI-C strtod if you need the lookahead. | |
*/ | |
/* State table for the parser. */ | |
#define PNG_FP_INTEGER 0 /* before or in integer */ | |
#define PNG_FP_FRACTION 1 /* before or in fraction */ | |
#define PNG_FP_EXPONENT 2 /* before or in exponent */ | |
#define PNG_FP_STATE 3 /* mask for the above */ | |
#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ | |
#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ | |
#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ | |
#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ | |
#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ | |
/* These three values don't affect the parser. They are set but not used. | |
*/ | |
#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ | |
#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ | |
#define PNG_FP_NONZERO 256 /* A non-zero value */ | |
#define PNG_FP_STICKY 448 /* The above three flags */ | |
/* This is available for the caller to store in 'state' if required. Do not | |
* call the parser after setting it (the parser sometimes clears it.) | |
*/ | |
#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ | |
/* Result codes for the parser (boolean - true meants ok, false means | |
* not ok yet.) | |
*/ | |
#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ | |
#define PNG_FP_OK 1 /* The number is valid */ | |
/* Tests on the sticky non-zero and negative flags. To pass these checks | |
* the state must also indicate that the whole number is valid - this is | |
* achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this | |
* is equivalent to PNG_FP_OK above.) | |
*/ | |
#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) | |
/* NZ_MASK: the string is valid and a non-zero negative value */ | |
#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) | |
/* Z MASK: the string is valid and a non-zero value. */ | |
/* PNG_FP_SAW_DIGIT: the string is valid. */ | |
#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) | |
#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) | |
#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) | |
/* The actual parser. This can be called repeatedly. It updates | |
* the index into the string and the state variable (which must | |
* be initialized to 0). It returns a result code, as above. There | |
* is no point calling the parser any more if it fails to advance to | |
* the end of the string - it is stuck on an invalid character (or | |
* terminated by '\0'). | |
* | |
* Note that the pointer will consume an E or even an E+ and then leave | |
* a 'maybe' state even though a preceding integer.fraction is valid. | |
* The PNG_FP_WAS_VALID flag indicates that a preceding substring was | |
* a valid number. It's possible to recover from this by calling | |
* the parser again (from the start, with state 0) but with a string | |
* that omits the last character (i.e. set the size to the index of | |
* the problem character.) This has not been tested within libpng. | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, | |
png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); | |
/* This is the same but it checks a complete string and returns true | |
* only if it just contains a floating point number. As of 1.5.4 this | |
* function also returns the state at the end of parsing the number if | |
* it was valid (otherwise it returns 0.) This can be used for testing | |
* for negative or zero values using the sticky flag. | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, | |
png_size_t size),PNG_EMPTY); | |
#endif /* pCAL || sCAL */ | |
#if defined(PNG_READ_GAMMA_SUPPORTED) ||\ | |
defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) | |
/* Added at libpng version 1.5.0 */ | |
/* This is a utility to provide a*times/div (rounded) and indicate | |
* if there is an overflow. The result is a boolean - false (0) | |
* for overflow, true (1) if no overflow, in which case *res | |
* holds the result. | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, | |
png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); | |
#endif | |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) | |
/* Same deal, but issue a warning on overflow and return 0. */ | |
PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, | |
(png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, | |
png_int_32 divided_by),PNG_EMPTY); | |
#endif | |
#ifdef PNG_GAMMA_SUPPORTED | |
/* Calculate a reciprocal - used for gamma values. This returns | |
* 0 if the argument is 0 in order to maintain an undefined value; | |
* there are no warnings. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), | |
PNG_EMPTY); | |
#ifdef PNG_READ_GAMMA_SUPPORTED | |
/* The same but gives a reciprocal of the product of two fixed point | |
* values. Accuracy is suitable for gamma calculations but this is | |
* not exact - use png_muldiv for that. Only required at present on read. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, | |
png_fixed_point b),PNG_EMPTY); | |
#endif | |
/* Return true if the gamma value is significantly different from 1.0 */ | |
PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), | |
PNG_EMPTY); | |
#endif | |
#ifdef PNG_READ_GAMMA_SUPPORTED | |
/* Internal fixed point gamma correction. These APIs are called as | |
* required to convert single values - they don't need to be fast, | |
* they are not used when processing image pixel values. | |
* | |
* While the input is an 'unsigned' value it must actually be the | |
* correct bit value - 0..255 or 0..65535 as required. | |
*/ | |
PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, | |
unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, | |
png_fixed_point gamma_value),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, | |
png_fixed_point gamma_value),PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), | |
PNG_EMPTY); | |
PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, | |
int bit_depth),PNG_EMPTY); | |
#endif | |
/* SIMPLIFIED READ/WRITE SUPPORT */ | |
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ | |
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) | |
/* The internal structure that png_image::opaque points to. */ | |
typedef struct png_control | |
{ | |
png_structp png_ptr; | |
png_infop info_ptr; | |
png_voidp error_buf; /* Always a jmp_buf at present. */ | |
png_const_bytep memory; /* Memory buffer. */ | |
png_size_t size; /* Size of the memory buffer. */ | |
unsigned int for_write :1; /* Otherwise it is a read structure */ | |
unsigned int owned_file :1; /* We own the file in io_ptr */ | |
} png_control; | |
/* Return the pointer to the jmp_buf from a png_control: necessary because C | |
* does not reveal the type of the elements of jmp_buf. | |
*/ | |
#ifdef __cplusplus | |
# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) | |
#else | |
# define png_control_jmp_buf(pc) ((pc)->error_buf) | |
#endif | |
/* Utility to safely execute a piece of libpng code catching and logging any | |
* errors that might occur. Returns true on success, false on failure (either | |
* of the function or as a result of a png_error.) | |
*/ | |
PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, | |
png_const_charp error_message),PNG_NORETURN); | |
#ifdef PNG_WARNINGS_SUPPORTED | |
PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, | |
png_const_charp warning_message),PNG_EMPTY); | |
#else | |
# define png_safe_warning 0/*dummy argument*/ | |
#endif | |
PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, | |
int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); | |
/* Utility to log an error; this also cleans up the png_image; the function | |
* always returns 0 (false). | |
*/ | |
PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, | |
png_const_charp error_message),PNG_EMPTY); | |
#ifndef PNG_SIMPLIFIED_READ_SUPPORTED | |
/* png_image_free is used by the write code but not exported */ | |
PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); | |
#endif /* !SIMPLIFIED_READ */ | |
#endif /* SIMPLIFIED READ/WRITE */ | |
/* These are initialization functions for hardware specific PNG filter | |
* optimizations; list these here then select the appropriate one at compile | |
* time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined | |
* the generic code is used. | |
*/ | |
#ifdef PNG_FILTER_OPTIMIZATIONS | |
PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, | |
unsigned int bpp), PNG_EMPTY); | |
/* Just declare the optimization that will be used */ | |
#else | |
/* List *all* the possible optimizations here - this branch is required if | |
* the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in | |
* CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. | |
*/ | |
PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, | |
(png_structp png_ptr, unsigned int bpp), PNG_EMPTY); | |
#endif | |
/* Maintainer: Put new private prototypes here ^ */ | |
#include "pngdebug.h" | |
#ifdef __cplusplus | |
} | |
#endif | |
#endif /* PNG_VERSION_INFO_ONLY */ | |
#endif /* PNGPRIV_H */ |