| |
| /* pngpriv.h - private declarations for use inside libpng |
| * |
| * Last changed in libpng 1.6.22 [May 26, 2016] |
| * Copyright (c) 1998-2002,2004,2006-2016 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.) |
| * |
| * 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. |
| * |
| * Note that gcc-4.9 defines __ARM_NEON instead of the deprecated |
| * __ARM_NEON__, so we check both variants. |
| * |
| * To disable ARM_NEON optimizations entirely, and skip compiling the |
| * associated assembler code, pass --enable-arm-neon=no to configure |
| * or put -DPNG_ARM_NEON_OPT=0 in CPPFLAGS. |
| */ |
| # if (defined(__ARM_NEON__) || 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 |
| # if defined(__ARM_NEON__) || defined(__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 /* !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 */ |
| |
| #ifndef PNG_INTEL_SSE_OPT |
| # ifdef PNG_INTEL_SSE |
| /* Only check for SSE if the build configuration has been modified to |
| * enable SSE optimizations. This means that these optimizations will |
| * be off by default. See contrib/intel for more details. |
| */ |
| # if defined(__SSE4_1__) || defined(__AVX__) || defined(__SSSE3__) || \ |
| defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ |
| (defined(_M_IX86_FP) && _M_IX86_FP >= 2) |
| # define PNG_INTEL_SSE_OPT 1 |
| # endif |
| # endif |
| #endif |
| |
| #if PNG_INTEL_SSE_OPT > 0 |
| # ifndef PNG_INTEL_SSE_IMPLEMENTATION |
| # if defined(__SSE4_1__) || defined(__AVX__) |
| /* We are not actually using AVX, but checking for AVX is the best |
| way we can detect SSE4.1 and SSSE3 on MSVC. |
| */ |
| # define PNG_INTEL_SSE_IMPLEMENTATION 3 |
| # elif defined(__SSSE3__) |
| # define PNG_INTEL_SSE_IMPLEMENTATION 2 |
| # elif defined(__SSE2__) || defined(_M_X64) || defined(_M_AMD64) || \ |
| (defined(_M_IX86_FP) && _M_IX86_FP >= 2) |
| # define PNG_INTEL_SSE_IMPLEMENTATION 1 |
| # else |
| # define PNG_INTEL_SSE_IMPLEMENTATION 0 |
| # endif |
| # endif |
| |
| # if PNG_INTEL_SSE_IMPLEMENTATION > 0 |
| # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_sse2 |
| # endif |
| #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) PNG_LINKAGE_DATA type name array |
| #endif |
| |
| #ifndef PNG_INTERNAL_FUNCTION |
| # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ |
| PNG_LINKAGE_FUNCTION PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) |
| #endif |
| |
| #ifndef PNG_INTERNAL_CALLBACK |
| # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ |
| PNG_LINKAGE_CALLBACK 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 |
| |
| /* This is a global switch to set the compilation for an installed system |
| * (a release build). It can be set for testing debug builds to ensure that |
| * they will compile when the build type is switched to RC or STABLE, the |
| * default is just to use PNG_LIBPNG_BUILD_BASE_TYPE. Set this in CPPFLAGS |
| * with either: |
| * |
| * -DPNG_RELEASE_BUILD Turns on the release compile path |
| * -DPNG_RELEASE_BUILD=0 Turns it off |
| * or in your pngusr.h with |
| * #define PNG_RELEASE_BUILD=1 Turns on the release compile path |
| * #define PNG_RELEASE_BUILD=0 Turns it off |
| */ |
| #ifndef PNG_RELEASE_BUILD |
| # define PNG_RELEASE_BUILD (PNG_LIBPNG_BUILD_BASE_TYPE >= PNG_LIBPNG_BUILD_RC) |
| #endif |
| |
| /* SECURITY and SAFETY: |
| * |
| * libpng is built with support for internal limits on image dimensions and |
| * memory usage. These are documented in scripts/pnglibconf.dfa of the |
| * source and recorded in the machine generated header file pnglibconf.h. |
| */ |
| |
| /* 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 |
| |
| /* 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) & 0xff), \ |
| ((char*)(s))[1]=(char)(((c)>>16) & 0xff),\ |
| ((char*)(s))[2]=(char)(((c)>>8) & 0xff), \ |
| ((char*)(s))[3]=(char)((c & 0xff))) |
| |
| /* 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)(0xff & ((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 /* 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, 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); |
| |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_sse2,(png_row_infop |
| row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_sse2,(png_row_infop |
| row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_sse2,(png_row_infop |
| row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_sse2,(png_row_infop |
| row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_sse2,(png_row_infop |
| row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_sse2,(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 /* SEQUENTIAL_READ */ |
| |
| /* Initialize the row buffers, etc. */ |
| PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); |
| |
| #if PNG_ZLIB_VERNUM >= 0x1240 |
| PNG_INTERNAL_FUNCTION(int,png_zlib_inflate,(png_structrp png_ptr, int flush), |
| PNG_EMPTY); |
| # define PNG_INFLATE(pp, flush) png_zlib_inflate(pp, flush) |
| #else /* Zlib < 1.2.4 */ |
| # define PNG_INFLATE(pp, flush) inflate(&(pp)->zstream, flush) |
| #endif /* Zlib < 1.2.4 */ |
| |
| #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 /* READ_iCCP */ |
| |
| #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 /* READ_sPLT */ |
| |
| #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_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 /* PROGRESSIVE_READ */ |
| |
| /* 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. */ |
| #ifdef PNG_READ_iCCP_SUPPORTED |
| 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); |
| #endif /* READ_iCCP */ |
| 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); |
| PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_sse2, |
| (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); |
| #endif |
| |
| PNG_INTERNAL_FUNCTION(png_uint_32, png_check_keyword, (png_structrp png_ptr, |
| png_const_charp key, png_bytep new_key), PNG_EMPTY); |
| |
| /* Maintainer: Put new private prototypes here ^ */ |
| |
| #include "pngdebug.h" |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* PNG_VERSION_INFO_ONLY */ |
| #endif /* PNGPRIV_H */ |
