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Diffstat (limited to 'png/pngpriv.h')
| -rw-r--r-- | png/pngpriv.h | 1940 |
1 files changed, 0 insertions, 1940 deletions
diff --git a/png/pngpriv.h b/png/pngpriv.h deleted file mode 100644 index c498313..0000000 --- a/png/pngpriv.h +++ /dev/null @@ -1,1940 +0,0 @@ - -/* pngpriv.h - private declarations for use inside libpng - * - * For conditions of distribution and use, see copyright notice in png.h - * Copyright (c) 1998-2014 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 1.6.10 [March 6, 1014]] - * - * 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. - * - * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they - * can only be turned on automatically if that is supported too. If - * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail - * to compile with an appropriate #error if ALIGNED_MEMORY has been turned - * off. - */ -# if defined(__ARM_NEON__) && defined(PNG_ALIGNED_MEMORY_SUPPORTED) -# 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 - - /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used - * if possible - if __ARM_NEON__ is set and the compiler version is not known - * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can - * be: - * - * 1 The intrinsics code (the default with __ARM_NEON__) - * 2 The hand coded assembler (the default without __ARM_NEON__) - * - * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however - * this is *NOT* supported and may cease to work even after a minor revision - * to libpng. It *is* valid to do this for testing purposes, e.g. speed - * testing or a new compiler, but the results should be communicated to the - * libpng implementation list for incorporation in the next minor release. - */ -# ifndef PNG_ARM_NEON_IMPLEMENTATION -# ifdef __ARM_NEON__ -# if defined(__clang__) - /* At present it is unknown by the libpng developers which versions - * of clang support the intrinsics, however some or perhaps all - * versions do not work with the assembler so this may be - * irrelevant, so just use the default (do nothing here.) - */ -# elif defined(__GNUC__) - /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to - * work, so if this *is* GCC, or G++, look for a version >4.5 - */ -# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) -# define PNG_ARM_NEON_IMPLEMENTATION 2 -# endif /* no GNUC support */ -# endif /* __GNUC__ */ -# else /* !defined __ARM_NEON__ */ - /* The 'intrinsics' code simply won't compile without this -mfpu=neon: - */ -# define PNG_ARM_NEON_IMPLEMENTATION 2 -# endif /* __ARM_NEON__ */ -# endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */ - -# ifndef PNG_ARM_NEON_IMPLEMENTATION - /* Use the intrinsics code by default. */ -# define PNG_ARM_NEON_IMPLEMENTATION 1 -# endif -#endif /* PNG_ARM_NEON_OPT > 0 */ - -/* 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 - -#ifndef PNG_INTERNAL_CALLBACK -# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ - extern PNG_FUNCTION(type, (PNGCBAPI 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_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_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 /* PNG_SEQUENTIAL_READ_SUPPORTED */ - -/* 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 - -/* Shared transform functions, defined in pngtran.c */ -#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 - -#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 - -#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 - -/* 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); - -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. - */ - -#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ - defined(PNG_HANDLE_AS_UNKNOWN_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 /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ - -/* 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 */ - -/* 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_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_CALLBACK(void,png_safe_error,(png_structp png_ptr, - png_const_charp error_message),PNG_NORETURN); - -#ifdef PNG_WARNINGS_SUPPORTED -PNG_INTERNAL_CALLBACK(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 */ |