1b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 2b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* pngpriv.h - private declarations for use inside libpng 3b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 4b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * For conditions of distribution and use, see copyright notice in png.h 5b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * Copyright (c) 1998-2014 Glenn Randers-Pehrson 6b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 9b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * Last changed in libpng 1.6.10 [March 6, 2014] 10b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 11b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * This code is released under the libpng license. 12b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * For conditions of distribution and use, see the disclaimer 13b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and license in png.h 14b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 15b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 16b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The symbols declared in this file (including the functions declared 17b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * as extern) are PRIVATE. They are not part of the libpng public 18b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * interface, and are not recommended for use by regular applications. 19b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Some of them may become public in the future; others may stay private, 20b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * change in an incompatible way, or even disappear. 21b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Although the libpng users are not forbidden to include this header, 22b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * they should be well aware of the issues that may arise from doing so. 23b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 24b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 25b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNGPRIV_H 26b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNGPRIV_H 27b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 28b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Feature Test Macros. The following are defined here to ensure that correctly 29b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * implemented libraries reveal the APIs libpng needs to build and hide those 30b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that are not needed and potentially damaging to the compilation. 31b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 32b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Feature Test Macros must be defined before any system header is included (see 33b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * POSIX 1003.1 2.8.2 "POSIX Symbols." 34b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 35b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * These macros only have an effect if the operating system supports either 36b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * POSIX 1003.1 or C99, or both. On other operating systems (particularly 37b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Windows/Visual Studio) there is no effect; the OS specific tests below are 38b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * still required (as of 2011-05-02.) 39b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 40b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ 41b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 42b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_VERSION_INFO_ONLY 43b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Standard library headers not required by png.h: */ 44b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <stdlib.h> 45b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <string.h> 46b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 47b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 48b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNGLIB_BUILD /*libpng is being built, not used*/ 49b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 50b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* If HAVE_CONFIG_H is defined during the build then the build system must 51b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * provide an appropriate "config.h" file on the include path. The header file 52b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * must provide definitions as required below (search for "HAVE_CONFIG_H"); 53b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * see configure.ac for more details of the requirements. The macro 54b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on 55b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'configure'; define this macro to prevent the configure build including the 56b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * configure generated config.h. Libpng is expected to compile without *any* 57b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * special build system support on a reasonably ANSI-C compliant system. 58b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 59b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H) 60b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <config.h> 61b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 62b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Pick up the definition of 'restrict' from config.h if it was read: */ 63b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_RESTRICT restrict 64b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 65b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 66b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* To support symbol prefixing it is necessary to know *before* including png.h 67b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * whether the fixed point (and maybe other) APIs are exported, because if they 68b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are not internal definitions may be required. This is handled below just 69b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * before png.h is included, but load the configuration now if it is available. 70b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 71b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNGLCONF_H 72b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include "pnglibconf.h" 73b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 74b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 75b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Local renames may change non-exported API functions from png.h */ 76b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_PREFIX) && !defined(PNGPREFIX_H) 77b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include "pngprefix.h" 78b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 79b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 80b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_USER_CONFIG 81b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include "pngusr.h" 82b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* These should have been defined in pngusr.h */ 83b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_PRIVATEBUILD 84b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_PRIVATEBUILD "Custom libpng build" 85b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 86b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_DLLFNAME_POSTFIX 87b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_DLLFNAME_POSTFIX "Cb" 88b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 89b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 90b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 91b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Compile time options. 92b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ===================== 93b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * In a multi-arch build the compiler may compile the code several times for the 94b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * same object module, producing different binaries for different architectures. 95b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * When this happens configure-time setting of the target host options cannot be 96b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * done and this interferes with the handling of the ARM NEON optimizations, and 97b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * possibly other similar optimizations. Put additional tests here; in general 98b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this is needed when the same option can be changed at both compile time and 99b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * run time depending on the target OS (i.e. iOS vs Android.) 100b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 101b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because 102b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this is not possible with certain compilers (Oracle SUN OS CC), as a result 103b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it is necessary to ensure that all extern functions that *might* be used 104b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__ 105b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * below is one example of this behavior because it is controlled by the 106b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * presence or not of -mfpu=neon on the GCC command line, it is possible to do 107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely 108b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * do this. 109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 110b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_ARM_NEON_OPT 111b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* ARM NEON optimizations are being controlled by the compiler settings, 112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon 113b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * with GCC) then the compiler will define __ARM_NEON__ and we can rely 114b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * unconditionally on NEON instructions not crashing, otherwise we must 115b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * disable use of NEON instructions. 116b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * 117b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they 118b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * can only be turned on automatically if that is supported too. If 119b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail 120b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * to compile with an appropriate #error if ALIGNED_MEMORY has been turned 121b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * off. 12243608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh * 12343608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh * Note that gcc-4.9 defines __ARM_NEON instead of __ARM_NEON__, so we 12443608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh * check both variants. 125b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 12643608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh# if (defined(__ARM_NEON__) || defined(__ARM_NEON)) && \ 12743608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh defined(PNG_ALIGNED_MEMORY_SUPPORTED) 128b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ARM_NEON_OPT 2 129b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 130b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ARM_NEON_OPT 0 131b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 132b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 133b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if PNG_ARM_NEON_OPT > 0 135b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NEON optimizations are to be at least considered by libpng, so enable the 136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * callbacks to do this. 137b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 138b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon 139b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 140b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used 141b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * if possible - if __ARM_NEON__ is set and the compiler version is not known 142b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can 143b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * be: 144b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * 145b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * 1 The intrinsics code (the default with __ARM_NEON__) 146b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * 2 The hand coded assembler (the default without __ARM_NEON__) 147b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * 148b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however 149b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * this is *NOT* supported and may cease to work even after a minor revision 150b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * to libpng. It *is* valid to do this for testing purposes, e.g. speed 151b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * testing or a new compiler, but the results should be communicated to the 152b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * libpng implementation list for incorporation in the next minor release. 153b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari */ 154b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# ifndef PNG_ARM_NEON_IMPLEMENTATION 15543608cfba1024f3d1bfe3d0b4db58adece411cd9sireesh# if defined(__ARM_NEON__) || defined(__ARM_NEON) 156b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# if defined(__clang__) 157b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* At present it is unknown by the libpng developers which versions 158b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * of clang support the intrinsics, however some or perhaps all 159b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * versions do not work with the assembler so this may be 160b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * irrelevant, so just use the default (do nothing here.) 161b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari */ 162b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# elif defined(__GNUC__) 163b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to 164b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari * work, so if this *is* GCC, or G++, look for a version >4.5 165b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari */ 166b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6) 167b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# define PNG_ARM_NEON_IMPLEMENTATION 2 168b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# endif /* no GNUC support */ 169b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# endif /* __GNUC__ */ 170b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# else /* !defined __ARM_NEON__ */ 171b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* The 'intrinsics' code simply won't compile without this -mfpu=neon: 172b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari */ 173b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# define PNG_ARM_NEON_IMPLEMENTATION 2 174b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# endif /* __ARM_NEON__ */ 175b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */ 176b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 177b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# ifndef PNG_ARM_NEON_IMPLEMENTATION 178b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari /* Use the intrinsics code by default. */ 179b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# define PNG_ARM_NEON_IMPLEMENTATION 1 180b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# endif 181b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#endif /* PNG_ARM_NEON_OPT > 0 */ 182b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 183b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Is this a build of a DLL where compilation of the object modules requires 184b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * different preprocessor settings to those required for a simple library? If 185b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * so PNG_BUILD_DLL must be set. 186b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 187b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * If libpng is used inside a DLL but that DLL does not export the libpng APIs 188b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a 189b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * static library of libpng then link the DLL against that. 190b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 191b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_BUILD_DLL 192b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef DLL_EXPORT 193b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is set by libtool when files are compiled for a DLL; libtool 194b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * always compiles twice, even on systems where it isn't necessary. Set 195b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_BUILD_DLL in case it is necessary: 196b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 197b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_BUILD_DLL 198b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 199b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef _WINDLL 200b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is set by the Microsoft Visual Studio IDE in projects that 201b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * build a DLL. It can't easily be removed from those projects (it 202b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * isn't visible in the Visual Studio UI) so it is a fairly reliable 203b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * indication that PNG_IMPEXP needs to be set to the DLL export 204b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * attributes. 205b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 206b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_BUILD_DLL 207b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 208b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef __DLL__ 209b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is set by the Borland C system when compiling for a DLL 210b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (as above.) 211b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 212b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_BUILD_DLL 213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 214b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Add additional compiler cases here. */ 215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 216b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 217b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 218b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* Setting PNG_BUILD_DLL if required */ 219b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 220b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* See pngconf.h for more details: the builder of the library may set this on 221b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the command line to the right thing for the specific compilation system or it 222b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * may be automagically set above (at present we know of no system where it does 223b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * need to be set on the command line.) 224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 225b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_IMPEXP must be set here when building the library to prevent pngconf.h 226b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * setting it to the "import" setting for a DLL build. 227b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 228b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_IMPEXP 229b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_BUILD_DLL 230b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_IMPEXP PNG_DLL_EXPORT 231b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 232b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Not building a DLL, or the DLL doesn't require specific export 233b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * definitions. 234b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 235b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_IMPEXP 236b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 237b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 238b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 239b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* No warnings for private or deprecated functions in the build: */ 240b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_DEPRECATED 241b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_DEPRECATED 242b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 243b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_PRIVATE 244b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_PRIVATE 245b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 246b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 247b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Symbol preprocessing support. 248b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 249b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * To enable listing global, but internal, symbols the following macros should 250b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * always be used to declare an extern data or function object in this file. 251b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 252b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_INTERNAL_DATA 253b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_INTERNAL_DATA(type, name, array) extern type name array 254b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 255b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 256b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_INTERNAL_FUNCTION 257b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ 258b50c217251b086440efcdb273c22f86a06c80cbaChris Craik extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) 259b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 260b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 261b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#ifndef PNG_INTERNAL_CALLBACK 262b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari# define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\ 263b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes) 264b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#endif 265b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari 266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* If floating or fixed point APIs are disabled they may still be compiled 267b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * internally. To handle this make sure they are declared as the appropriate 268b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * internal extern function (otherwise the symbol prefixing stuff won't work and 269b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the functions will be used without definitions.) 270b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 271b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: although all the API functions are declared here they are not all 272b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * actually built! Because the declarations are still made it is necessary to 273b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * fake out types that they depend on. 274b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 275b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_FP_EXPORT 276b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_FLOATING_POINT_SUPPORTED 277b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_FP_EXPORT(ordinal, type, name, args)\ 278b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 279b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_VERSION_INFO_ONLY 280b50c217251b086440efcdb273c22f86a06c80cbaChris Craik typedef struct png_incomplete png_double; 281b50c217251b086440efcdb273c22f86a06c80cbaChris Craik typedef png_double* png_doublep; 282b50c217251b086440efcdb273c22f86a06c80cbaChris Craik typedef const png_double* png_const_doublep; 283b50c217251b086440efcdb273c22f86a06c80cbaChris Craik typedef png_double** png_doublepp; 284b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 285b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 286b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 287b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_FIXED_EXPORT 288b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_FIXED_POINT_SUPPORTED 289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_FIXED_EXPORT(ordinal, type, name, args)\ 290b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); 291b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 293b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 294b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#include "png.h" 295b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 296b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ 297b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_DLL_EXPORT 298b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_DLL_EXPORT 299b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 301b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* SECURITY and SAFETY: 302b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 303b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * By default libpng is built without any internal limits on image size, 304b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * individual heap (png_malloc) allocations or the total amount of memory used. 305b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used 306b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (unless individually overridden). These limits are believed to be fairly 307b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * safe, but builders of secure systems should verify the values against the 308b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * real system capabilities. 309b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_SAFE_LIMITS_SUPPORTED 311b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 'safe' limits */ 312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_WIDTH_MAX 313b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_WIDTH_MAX 1000000 314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 315b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_HEIGHT_MAX 316b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_HEIGHT_MAX 1000000 317b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_CHUNK_CACHE_MAX 319b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_CHUNK_CACHE_MAX 128 320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 321b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_CHUNK_MALLOC_MAX 322b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_CHUNK_MALLOC_MAX 8000000 323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 324b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 325b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* values for no limits */ 326b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_WIDTH_MAX 327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_WIDTH_MAX 0x7fffffff 328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 329b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_HEIGHT_MAX 330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_HEIGHT_MAX 0x7fffffff 331b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 332b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_CHUNK_CACHE_MAX 333b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_CHUNK_CACHE_MAX 0 334b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 335b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifndef PNG_USER_CHUNK_MALLOC_MAX 336b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USER_CHUNK_MALLOC_MAX 0 337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 339b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 340b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Moved to pngpriv.h at libpng-1.5.0 */ 341b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* NOTE: some of these may have been used in external applications as 342b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * these definitions were exposed in pngconf.h prior to 1.5. 343b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 344b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* If you are running on a machine where you cannot allocate more 346b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * than 64K of memory at once, uncomment this. While libpng will not 347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * normally need that much memory in a chunk (unless you load up a very 348b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * large file), zlib needs to know how big of a chunk it can use, and 349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * libpng thus makes sure to check any memory allocation to verify it 350b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * will fit into memory. 351b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 352b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zlib provides 'MAXSEG_64K' which, if defined, indicates the 353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * same limit and pngconf.h (already included) sets the limit 354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if certain operating systems are detected. 355b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 356b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) 357b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_MAX_MALLOC_64K 358b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 359b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_UNUSED 361b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Unused formal parameter warnings are silenced using the following macro 362b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * which is expected to have no bad effects on performance (optimizing 363b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * compilers will probably remove it entirely). Note that if you replace 364b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it with something other than whitespace, you must include the terminating 365b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * semicolon. 366b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 367b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_UNUSED(param) (void)param; 368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 369b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 370b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Just a little check that someone hasn't tried to define something 371b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * contradictory. 372b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 373b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) 374b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# undef PNG_ZBUF_SIZE 375b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ZBUF_SIZE 65536L 376b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 377b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 378b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* If warnings or errors are turned off the code is disabled or redirected here. 379b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * From 1.5.4 functions have been added to allow very limited formatting of 380b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * error and warning messages - this code will also be disabled here. 381b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 382b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WARNINGS_SUPPORTED 383b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; 384b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 385b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_warning_parameter(p,number,string) ((void)0) 386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_warning_parameter_unsigned(p,number,format,value) ((void)0) 387b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_warning_parameter_signed(p,number,format,value) ((void)0) 388b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_formatted_warning(pp,p,message) ((void)(pp)) 389b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_WARNING_PARAMETERS(p) 390b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_ERROR_TEXT_SUPPORTED 392b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_fixed_error(s1,s2) png_err(s1) 393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 395b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* C allows up-casts from (void*) to any pointer and (const void*) to any 396b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * pointer to a const object. C++ regards this as a type error and requires an 397b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * explicit, static, cast and provides the static_cast<> rune to ensure that 398b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * const is not cast away. 399b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 400b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef __cplusplus 401b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_voidcast(type, value) static_cast<type>(value) 402b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_constcast(type, value) const_cast<type>(value) 403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_aligncast(type, value) \ 404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static_cast<type>(static_cast<void*>(value)) 405b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_aligncastconst(type, value) \ 406b50c217251b086440efcdb273c22f86a06c80cbaChris Craik static_cast<type>(static_cast<const void*>(value)) 407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 408b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_voidcast(type, value) (value) 409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_constcast(type, value) ((type)(value)) 410b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_aligncast(type, value) ((void*)(value)) 411b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_aligncastconst(type, value) ((const void*)(value)) 412b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* __cplusplus */ 413b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 414b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Some fixed point APIs are still required even if not exported because 415b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * they get used by the corresponding floating point APIs. This magic 416b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * deals with this: 417b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 418b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FIXED_POINT_SUPPORTED 419b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNGFAPI PNGAPI 420b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 421b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNGFAPI /* PRIVATE */ 422b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 424b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_VERSION_INFO_ONLY 425b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Other defines specific to compilers can go here. Try to keep 426b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * them inside an appropriate ifdef/endif pair for portability. 427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 428b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ 429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) 430b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* png.c requires the following ANSI-C constants if the conversion of 431b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * floating point to ASCII is implemented therein: 432b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * DBL_DIG Maximum number of decimal digits (can be set to any constant) 434b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) 435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * DBL_MAX Maximum floating point number (can be set to an arbitrary value) 436b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <float.h> 438b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 439b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ 440b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) 441b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* We need to check that <math.h> hasn't already been included earlier 442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * as it seems it doesn't agree with <fp.h>, yet we should really use 443b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * <fp.h> if possible. 444b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 445b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <fp.h> 447b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 449b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <math.h> 450b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 451b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 452b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Amiga SAS/C: We must include builtin FPU functions when compiling using 453b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * MATH=68881 454b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 455b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <m68881.h> 456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This provides the non-ANSI (far) memory allocation routines. */ 460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(__TURBOC__) && defined(__MSDOS__) 461b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <mem.h> 462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <alloc.h> 463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 466b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(_WIN32) || defined(__WIN32__) 467b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# include <windows.h> /* defines _WINDOWS_ macro */ 468b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_VERSION_INFO_ONLY */ 470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 471b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Moved here around 1.5.0beta36 from pngconf.h */ 472b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Users may want to use these so they are not private. Any library 473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * functions that are passed far data must be model-independent. 474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Memory model/platform independent fns */ 477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_ABORT 478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef _WINDOWS_ 479b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ABORT() ExitProcess(0) 480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ABORT() abort() 482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 484b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 485b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* These macros may need to be architecture dependent. */ 486b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ALIGN_NONE 0 /* do not use data alignment */ 487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ 488b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef offsetof 489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ 490b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 491b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ 492b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 493b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ 494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 495b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_ALIGN_TYPE 496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Default to using aligned access optimizations and requiring alignment to a 497b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * multiple of the data type size. Override in a compiler specific fashion 498b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if necessary by inserting tests here: 499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 500b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_ALIGN_TYPE PNG_ALIGN_SIZE 501b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 503b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE 504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is used because in some compiler implementations non-aligned 505b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * structure members are supported, so the offsetof approach below fails. 506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access 507b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is good for performance. Do not do this unless you have tested the result 508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and understand it. 509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 510b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_alignof(type) (sizeof (type)) 511b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET 513b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_alignof(type) offsetof(struct{char c; type t;}, t) 514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# else 515b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS 516b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_alignof(type) (1) 517b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 518b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Else leave png_alignof undefined to prevent use thereof */ 519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This implicitly assumes alignment is always to a power of 2. */ 523b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef png_alignof 524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_isaligned(ptr, type)\ 525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) 526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_isaligned(ptr, type) 0 528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* End of memory model/platform independent support */ 531b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* End of 1.5.0beta36 move from pngconf.h */ 532b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 533b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* CONSTANTS and UTILITY MACROS 534b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * These are used internally by libpng and not exposed in the API 535b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 536b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 537b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Various modes of operation. Note that after an init, mode is set to 538b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zero automatically when the structure is created. Three of these 539b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are defined in png.h because they need to be visible to applications 540b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that call png_set_unknown_chunk(). 541b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 542b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ 543b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ 544b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_HAVE_IDAT 0x04 545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ 546b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_HAVE_IEND 0x10 547b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x20 (unused) */ 548b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x40 (unused) */ 549b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x80 (unused) */ 550b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_HAVE_CHUNK_HEADER 0x100 551b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_WROTE_tIME 0x200 552b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 553b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_BACKGROUND_IS_GRAY 0x800 554b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_HAVE_PNG_SIGNATURE 0x1000 555b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 556b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x4000 (unused) */ 557b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ 558b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 559b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Flags for the transformations the PNG library does on the image data */ 560b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_BGR 0x0001 561b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_INTERLACE 0x0002 562b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_PACK 0x0004 563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_SHIFT 0x0008 564b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_SWAP_BYTES 0x0010 565b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_INVERT_MONO 0x0020 566b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_QUANTIZE 0x0040 567b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ 568b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_BACKGROUND_EXPAND 0x0100 569b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ 570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ 571b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_RGBA 0x0800 572b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_EXPAND 0x1000 573b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_GAMMA 0x2000 574b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_GRAY_TO_RGB 0x4000 575b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FILLER 0x8000 576b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_PACKSWAP 0x10000 577b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_SWAP_ALPHA 0x20000 578b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_STRIP_ALPHA 0x40000 579b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_INVERT_ALPHA 0x80000 580b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_USER_TRANSFORM 0x100000 581b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_RGB_TO_GRAY_ERR 0x200000 582b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_RGB_TO_GRAY_WARN 0x400000 583b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ 584b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ 585b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ 586b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ 587b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ 588b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x8000000 unused */ 589b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x10000000 unused */ 590b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x20000000 unused */ 591b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x40000000 unused */ 592b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Flags for png_create_struct */ 593b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_STRUCT_PNG 0x0001 594b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_STRUCT_INFO 0x0002 595b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 596b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Scaling factor for filter heuristic weighting calculations */ 597b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 598b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 599b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 600b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 601b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 602b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ 603b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x0004 unused */ 604b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ 605b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x0010 unused */ 606b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x0020 unused */ 607b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_ROW_INIT 0x0040 608b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_FILLER_AFTER 0x0080 609b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 610b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 611b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 612b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 613b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ 614b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ 615b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ 616b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */ 617b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */ 618b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_LIBRARY_MISMATCH 0x20000 619b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 620b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 621b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ 622b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ 623b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ 624b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x800000 unused */ 625b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x1000000 unused */ 626b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x2000000 unused */ 627b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x4000000 unused */ 628b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x8000000 unused */ 629b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x10000000 unused */ 630b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x20000000 unused */ 631b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 0x40000000 unused */ 632b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 634b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FLAG_CRC_ANCILLARY_NOWARN) 635b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 636b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 637b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FLAG_CRC_CRITICAL_IGNORE) 638b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 639b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 640b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_FLAG_CRC_CRITICAL_MASK) 641b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 642b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Save typing and make code easier to understand */ 643b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 644b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 645b50c217251b086440efcdb273c22f86a06c80cbaChris Craik abs((int)((c1).green) - (int)((c2).green)) + \ 646b50c217251b086440efcdb273c22f86a06c80cbaChris Craik abs((int)((c1).blue) - (int)((c2).blue))) 647b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 648b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 649b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * by dividing by 257 *with rounding*. This macro is exact for the given range. 650b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the 651b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * macro were established by experiment (modifying the added value). The macro 652b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * has a second variant that takes a value already scaled by 255 and divides by 653b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it 654b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. 655b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 656b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_DIV65535(v24) (((v24) + 32895) >> 16) 657b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) 658b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 659b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added to libpng-1.2.6 JB */ 660b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_ROWBYTES(pixel_bits, width) \ 661b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((pixel_bits) >= 8 ? \ 662b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 663b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 664b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 665b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* PNG_OUT_OF_RANGE returns true if value is outside the range 666b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ideal-delta..ideal+delta. Each argument is evaluated twice. 667b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * "ideal" and "delta" should be constants, normally simple 668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * integers, "value" a variable. Added to libpng-1.2.6 JB 669b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 670b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 671b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 672b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 673b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Conversions between fixed and floating point, only defined if 674b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * required (to make sure the code doesn't accidentally use float 675b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * when it is supposedly disabled.) 676b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 677b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FLOATING_POINT_SUPPORTED 678b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The floating point conversion can't overflow, though it can and 679b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does lose accuracy relative to the original fixed point value. 680b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * In practice this doesn't matter because png_fixed_point only 681b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * stores numbers with very low precision. The png_ptr and s 682b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * arguments are unused by default but are there in case error 683b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * checking becomes a requirement. 684b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 685b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_float(png_ptr, fixed, s) (.00001 * (fixed)) 686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The fixed point conversion performs range checking and evaluates 688b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * its argument multiple times, so must be used with care. The 689b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * range checking uses the PNG specification values for a signed 690b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 32 bit fixed point value except that the values are deliberately 691b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * rounded-to-zero to an integral value - 21474 (21474.83 is roughly 692b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (2^31-1) * 100000). 's' is a string that describes the value being 693b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * converted. 694b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 695b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: this macro will raise a png_error if the range check fails, 696b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * therefore it is normally only appropriate to use this on values 697b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that come from API calls or other sources where an out of range 698b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * error indicates a programming error, not a data error! 699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 700b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: by default this is off - the macro is not used - because the 701b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * function call saves a lot of code. 702b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 703b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FIXED_POINT_MACRO_SUPPORTED 704b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ 705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) 706b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 707b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* else the corresponding function is defined below, inside the scope of the 708b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * cplusplus test. 709b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 710b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 711b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 712b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Constants for known chunk types. If you need to add a chunk, define the name 713b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * here. For historical reasons these constants have the form png_<name>; i.e. 714b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the prefix is lower case. Please use decimal values as the parameters to 715b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * match the ISO PNG specification and to avoid relying on the C locale 716b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * interpretation of character values. 717b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 718b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values 719b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string 720b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * to be generated if required. 721b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 722b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_32b correctly produces a value shifted by up to 24 bits, even on 723b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * architectures where (int) is only 16 bits. 724b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 725b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_32b(b,s) ((png_uint_32)(b) << (s)) 726b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_U32(b1,b2,b3,b4) \ 727b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) 728b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Constants for known chunk types. 730b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 731b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * MAINTAINERS: If you need to add a chunk, define the name here. 732b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * For historical reasons these constants have the form png_<name>; i.e. 733b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the prefix is lower case. Please use decimal values as the parameters to 734b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * match the ISO PNG specification and to avoid relying on the C locale 735b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * interpretation of character values. Please keep the list sorted. 736b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 737b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk 738b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * type. In fact the specification does not express chunk types this way, 739b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * however using a 32-bit value means that the chunk type can be read from the 740b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * stream using exactly the same code as used for a 32-bit unsigned value and 741b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * can be examined far more efficiently (using one arithmetic compare). 742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 743b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Prior to 1.5.6 the chunk type constants were expressed as C strings. The 744b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * libpng API still uses strings for 'unknown' chunks and a macro, 745b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice 746b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that for portable code numeric values must still be used; the string "IHDR" 747b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is not portable and neither is PNG_U32('I', 'H', 'D', 'R'). 748b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 749b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * In 1.7.0 the definitions will be made public in png.h to avoid having to 750b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * duplicate the same definitions in application code. 751b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 752b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_IDAT PNG_U32( 73, 68, 65, 84) 753b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_IEND PNG_U32( 73, 69, 78, 68) 754b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_IHDR PNG_U32( 73, 72, 68, 82) 755b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_PLTE PNG_U32( 80, 76, 84, 69) 756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_bKGD PNG_U32( 98, 75, 71, 68) 757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_cHRM PNG_U32( 99, 72, 82, 77) 758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */ 759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_gAMA PNG_U32(103, 65, 77, 65) 760b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_gIFg PNG_U32(103, 73, 70, 103) 761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */ 762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_gIFx PNG_U32(103, 73, 70, 120) 763b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_hIST PNG_U32(104, 73, 83, 84) 764b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_iCCP PNG_U32(105, 67, 67, 80) 765b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_iTXt PNG_U32(105, 84, 88, 116) 766b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_oFFs PNG_U32(111, 70, 70, 115) 767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_pCAL PNG_U32(112, 67, 65, 76) 768b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_pHYs PNG_U32(112, 72, 89, 115) 769b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_sBIT PNG_U32(115, 66, 73, 84) 770b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_sCAL PNG_U32(115, 67, 65, 76) 771b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_sPLT PNG_U32(115, 80, 76, 84) 772b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_sRGB PNG_U32(115, 82, 71, 66) 773b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_sTER PNG_U32(115, 84, 69, 82) 774b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_tEXt PNG_U32(116, 69, 88, 116) 775b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_tIME PNG_U32(116, 73, 77, 69) 776b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_tRNS PNG_U32(116, 82, 78, 83) 777b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define png_zTXt PNG_U32(122, 84, 88, 116) 778b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 779b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The following will work on (signed char*) strings, whereas the get_uint_32 780b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * macro will fail on top-bit-set values because of the sign extension. 781b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 782b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_FROM_STRING(s)\ 783b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) 784b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 785b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This uses (char), not (png_byte) to avoid warnings on systems where (char) is 786b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * signed and the argument is a (char[]) This macro will fail miserably on 787b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * systems where (char) is more than 8 bits. 788b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 789b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_STRING_FROM_CHUNK(s,c)\ 790b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ 791b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) 792b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 793b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Do the same but terminate with a null character. */ 794b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CSTRING_FROM_CHUNK(s,c)\ 795b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) 796b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 797b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Test on flag values as defined in the spec (section 5.4): */ 798b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29)) 799b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c)) 800b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) 801b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) 802b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) 803b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 804b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Gamma values (new at libpng-1.5.4): */ 805b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ 806b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_GAMMA_MAC_INVERSE 65909 807b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_GAMMA_sRGB_INVERSE 45455 808b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 809b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Almost everything below is C specific; the #defines above can be used in 810b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot. 811b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 812b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_VERSION_INFO_ONLY 813b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 814b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#include "pngstruct.h" 815b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#include "pnginfo.h" 816b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 817b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Validate the include paths - the include path used to generate pnglibconf.h 818b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * must match that used in the build, or we must be using pnglibconf.h.prebuilt: 819b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 820b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM 821b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# error ZLIB_VERNUM != PNG_ZLIB_VERNUM \ 822b50c217251b086440efcdb273c22f86a06c80cbaChris Craik "-I (include path) error: see the notes in pngpriv.h" 823b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This means that when pnglibconf.h was built the copy of zlib.h that it 824b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * used is not the same as the one being used here. Because the build of 825b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * libpng makes decisions to use inflateInit2 and inflateReset2 based on the 826b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * zlib version number and because this affects handling of certain broken 827b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG files the -I directives must match. 828b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The most likely explanation is that you passed a -I in CFLAGS, this will 830b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not work; all the preprocessor directories and in particular all the -I 831b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * directives must be in CPPFLAGS. 832b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 834b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 835b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This is used for 16 bit gamma tables -- only the top level pointers are 836b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * const; this could be changed: 837b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 838b50c217251b086440efcdb273c22f86a06c80cbaChris Craiktypedef const png_uint_16p * png_const_uint_16pp; 839b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 840b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added to libpng-1.5.7: sRGB conversion tables */ 841b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 842b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 843b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_SIMPLIFIED_READ_SUPPORTED 844b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); 845b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, 846b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 0..65535. This table gives the closest 16-bit answers (no errors). 847b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 848b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 849b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 850b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); 851b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); 852b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 853b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ 854b50c217251b086440efcdb273c22f86a06c80cbaChris Craik ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) 855b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB 856b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * encoded value with maximum error 0.646365. Note that the input is not a 857b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 16-bit value; it has been multiplied by 255! */ 858b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_SIMPLIFIED_READ/WRITE */ 859b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 860b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 861b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 862b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef __cplusplus 863b50c217251b086440efcdb273c22f86a06c80cbaChris Craikextern "C" { 864b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* __cplusplus */ 865b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 866b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Internal functions; these are not exported from a DLL however because they 867b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are used within several of the C source files they have to be C extern. 868b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 869b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * All of these functions must be declared with PNG_INTERNAL_FUNCTION. 870b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 871b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 872b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Zlib support */ 873b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_UNEXPECTED_ZLIB_RETURN (-7) 874b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), 875b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 876b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Used by the zlib handling functions to ensure that z_stream::msg is always 877b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * set before they return. 878b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 879b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 880b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_SUPPORTED 881b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, 882b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_compression_bufferp *list),PNG_EMPTY); 883b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Free the buffer list used by the compressed write code. */ 884b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 885b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 886b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_FLOATING_POINT_SUPPORTED) && \ 887b50c217251b086440efcdb273c22f86a06c80cbaChris Craik !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \ 888b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \ 889b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 890b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \ 891b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (defined(PNG_sCAL_SUPPORTED) && \ 892b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)) 893b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, 894b50c217251b086440efcdb273c22f86a06c80cbaChris Craik double fp, png_const_charp text),PNG_EMPTY); 895b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 896b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 897b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Check the user version string for compatibility, returns false if the version 898b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * numbers aren't compatible. 899b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 900b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, 901b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp user_png_ver),PNG_EMPTY); 902b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 903b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Internal base allocator - no messages, NULL on failure to allocate. This 904b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does, however, call the application provided allocator and that could call 905b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_error (although that would be a bug in the application implementation.) 906b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 907b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, 908b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_alloc_size_t size),PNG_ALLOCATED); 909b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 910b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\ 911b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) 912b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Internal array allocator, outputs no error or warning messages on failure, 913b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * just returns NULL. 914b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 915b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr, 916b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int nelements, size_t element_size),PNG_ALLOCATED); 917b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 918b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The same but an existing array is extended by add_elements. This function 919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * also memsets the new elements to 0 and copies the old elements. The old 920b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * array is not freed or altered. 921b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 922b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr, 923b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_voidp array, int old_elements, int add_elements, 924b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t element_size),PNG_ALLOCATED); 925b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* text, sPLT or unknown chunks */ 926b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 927b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Magic to create a struct when there is no struct to call the user supplied 928b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * memory allocators. Because error handling has not been set up the memory 929b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * handlers can't safely call png_error, but this is an obscure and undocumented 930b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * restriction so libpng has to assume that the 'free' handler, at least, might 931b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * call png_error. 932b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 933b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, 934b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 935b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, 936b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_free_ptr free_fn),PNG_ALLOCATED); 937b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 938b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Free memory from internal libpng struct */ 939b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), 940b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 941b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 942b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Free an allocated jmp_buf (always succeeds) */ 943b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); 944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Function to allocate memory for zlib. PNGAPI is disallowed. */ 946b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), 947b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_ALLOCATED); 948b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 949b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Function to free memory for zlib. PNGAPI is disallowed. */ 950b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); 951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Next four functions are used internally as callbacks. PNGCBAPI is required 953b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to 954b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNGCBAPI at 1.5.0 955b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 956b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 957b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, 958b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep data, png_size_t length),PNG_EMPTY); 959b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 960b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 961b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, 962b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer, png_size_t length),PNG_EMPTY); 963b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 964b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 965b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, 966b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep data, png_size_t length),PNG_EMPTY); 967b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 968b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_FLUSH_SUPPORTED 969b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_STDIO_SUPPORTED 970b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), 971b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 972b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 973b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 974b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 975b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Reset the CRC variable */ 976b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); 977b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 978b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Write the "data" buffer to whatever output you are using */ 979b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, 980b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep data, png_size_t length),PNG_EMPTY); 981b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 982b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read and check the PNG file signature */ 983b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, 984b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 985b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 986b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read the chunk header (length + type name) */ 987b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), 988b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 989b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 990b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read data from whatever input you are using into the "data" buffer */ 991b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, 992b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t length),PNG_EMPTY); 993b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 994b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read bytes into buf, and update png_ptr->crc */ 995b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, 996b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 length),PNG_EMPTY); 997b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 998b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 999b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, 1000b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 skip),PNG_EMPTY); 1001b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1002b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Read the CRC from the file and compare it to the libpng calculated CRC */ 1003b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); 1004b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1005b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Calculate the CRC over a section of data. Note that we are only 1006b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * passing a maximum of 64K on systems that have this as a memory limit, 1007b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * since this is the maximum buffer size we can specify. 1008b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1009b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, 1010b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep ptr, png_size_t length),PNG_EMPTY); 1011b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1012b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_FLUSH_SUPPORTED 1013b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); 1014b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1015b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1016b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Write various chunks */ 1017b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1018b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Write the IHDR chunk, and update the png_struct with the necessary 1019b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * information. 1020b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1021b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, 1022b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, 1023b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int compression_method, int filter_method, int interlace_method),PNG_EMPTY); 1024b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1025b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, 1026b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); 1027b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1028b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, 1029b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), 1030b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1031b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1032b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); 1033b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1034b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_gAMA_SUPPORTED 1035b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, 1036b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_fixed_point file_gamma),PNG_EMPTY); 1037b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1038b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1039b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_sBIT_SUPPORTED 1040b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, 1041b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_color_8p sbit, int color_type),PNG_EMPTY); 1042b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1043b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1044b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_cHRM_SUPPORTED 1045b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, 1046b50c217251b086440efcdb273c22f86a06c80cbaChris Craik const png_xy *xy), PNG_EMPTY); 1047b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The xy value must have been previously validated */ 1048b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1049b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1050b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_sRGB_SUPPORTED 1051b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, 1052b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int intent),PNG_EMPTY); 1053b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1054b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1055b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_iCCP_SUPPORTED 1056b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, 1057b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp name, png_const_bytep profile), PNG_EMPTY); 1058b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The profile must have been previously validated for correctness, the 1059b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * length comes from the first four bytes. Only the base, deflate, 1060b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * compression is supported. 1061b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1062b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1063b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1064b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_sPLT_SUPPORTED 1065b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, 1066b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_sPLT_tp palette),PNG_EMPTY); 1067b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1068b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1069b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_tRNS_SUPPORTED 1070b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, 1071b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep trans, png_const_color_16p values, int number, 1072b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int color_type),PNG_EMPTY); 1073b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1074b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1075b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_bKGD_SUPPORTED 1076b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, 1077b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_color_16p values, int color_type),PNG_EMPTY); 1078b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1079b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1080b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_hIST_SUPPORTED 1081b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, 1082b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_uint_16p hist, int num_hist),PNG_EMPTY); 1083b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1084b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1085b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Chunks that have keywords */ 1086b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_tEXt_SUPPORTED 1087b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, 1088b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); 1089b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1090b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1091b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_zTXt_SUPPORTED 1092b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp 1093b50c217251b086440efcdb273c22f86a06c80cbaChris Craik key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); 1094b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1095b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1096b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_iTXt_SUPPORTED 1097b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, 1098b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int compression, png_const_charp key, png_const_charp lang, 1099b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp lang_key, png_const_charp text),PNG_EMPTY); 1100b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1101b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1102b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 1103b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, 1104b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); 1105b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1106b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1107b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_oFFs_SUPPORTED 1108b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, 1109b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); 1110b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1111b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1112b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_pCAL_SUPPORTED 1113b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, 1114b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, 1115b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp units, png_charpp params),PNG_EMPTY); 1116b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1117b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1118b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_pHYs_SUPPORTED 1119b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, 1120b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 1121b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int unit_type),PNG_EMPTY); 1122b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1123b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1124b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_tIME_SUPPORTED 1125b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, 1126b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_timep mod_time),PNG_EMPTY); 1127b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1128b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1129b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_sCAL_SUPPORTED 1130b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, 1131b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); 1132b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1133b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1134b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Called when finished processing a row of data */ 1135b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr), 1136b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1137b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1138b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Internal use only. Called before first row of data */ 1139b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr), 1140b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1141b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1142b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an 1143b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * array of png_ptr->width pixels. If the image is not interlaced or this 1144b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is the final pass this just does a memcpy, otherwise the "display" flag 1145b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is used to determine whether to copy pixels that are not in the current pass. 1146b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1147b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Because 'png_do_read_interlace' (below) replicates pixels this allows this 1148b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * function to achieve the documented 'blocky' appearance during interlaced read 1149b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' 1150b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * are not changed if they are not in the current pass, when display is 0. 1151b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1152b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. 1153b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1154b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The API always reads from the png_struct row buffer and always assumes that 1155b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it is full width (png_do_read_interlace has already been called.) 1156b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1157b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * This function is only ever used to write to row buffers provided by the 1158b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * caller of the relevant libpng API and the row must have already been 1159b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * transformed by the read transformations. 1160b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1161b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed 1162b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * bitmasks for use within the code, otherwise runtime generated masks are used. 1163b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The default is compile time masks. 1164b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1165b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_USE_COMPILE_TIME_MASKS 1166b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_USE_COMPILE_TIME_MASKS 1 1167b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1168b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, 1169b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row, int display),PNG_EMPTY); 1170b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1171b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_INTERLACING_SUPPORTED 1172b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Expand an interlaced row: the 'row_info' describes the pass data that has 1173b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * been read in and must correspond to the pixels in 'row', the pixels are 1174b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * expanded (moved apart) in 'row' to match the final layout, when doing this 1175b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the pixels are *replicated* to the intervening space. This is essential for 1176b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the correct operation of png_combine_row, above. 1177b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1178b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, 1179b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); 1180b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1181b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1182b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 1183b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1184b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_INTERLACING_SUPPORTED 1185b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Grab pixels out of a row for an interlaced pass */ 1186b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, 1187b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row, int pass),PNG_EMPTY); 1188b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1189b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1190b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Unfilter a row: check the filter value before calling this, there is no point 1191b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * calling it for PNG_FILTER_VALUE_NONE. 1192b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1193b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop 1194b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); 1195b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1196b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, 1197b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1198b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop 1199b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1200b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop 1201b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1202b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop 1203b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1204b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop 1205b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1206b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop 1207b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1208b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop 1209b50c217251b086440efcdb273c22f86a06c80cbaChris Craik row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY); 1210b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1211b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Choose the best filter to use and filter the row data */ 1212b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, 1213b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_row_infop row_info),PNG_EMPTY); 1214b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1215b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1216b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, 1217b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); 1218b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer 1219b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is NULL the function checks, instead, for the end of the stream. In this 1220b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * case a benign error will be issued if the stream end is not found or if 1221b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * extra data has to be consumed. 1222b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1223b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), 1224b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1225b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This cleans up when the IDAT LZ stream does not end when the last image 1226b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * byte is read; there is still some pending input. 1227b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1228b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1229b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), 1230b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1231b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Finish a row while reading, dealing with interlacing passes, etc. */ 1232b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#endif /* PNG_SEQUENTIAL_READ_SUPPORTED */ 1233b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1234b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Initialize the row buffers, etc. */ 1235b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); 1236b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1237b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1238b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Optional call to update the users info structure */ 1239b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, 1240b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1241b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1242b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1243b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari/* Shared transform functions, defined in pngtran.c */ 1244b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 1245b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1246b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, 1247b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row, int at_start),PNG_EMPTY); 1248b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1249b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1250b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_16BIT_SUPPORTED 1251b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1252b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, 1253b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row),PNG_EMPTY); 1254b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1255b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1256b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1257b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 1258b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1259b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, 1260b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row),PNG_EMPTY); 1261b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1262b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1263b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1264b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, 1265b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row),PNG_EMPTY); 1266b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1267b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1268b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1269b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, 1270b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row),PNG_EMPTY); 1271b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1272b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1273b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The following decodes the appropriate chunks, and does error correction, 1274b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * then calls the appropriate callback for the chunk if it is valid. 1275b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1276b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1277b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Decode the IHDR chunk */ 1278b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, 1279b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1280b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, 1281b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1282b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, 1283b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1284b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1285b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_bKGD_SUPPORTED 1286b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, 1287b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1288b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1289b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1290b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_cHRM_SUPPORTED 1291b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, 1292b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1293b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1294b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1295b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_gAMA_SUPPORTED 1296b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, 1297b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1298b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1299b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1300b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_hIST_SUPPORTED 1301b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, 1302b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1303b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1304b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1305b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_iCCP_SUPPORTED 1306b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, 1307b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1308b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_READ_iCCP_SUPPORTED */ 1309b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1310b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_iTXt_SUPPORTED 1311b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, 1312b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1313b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1314b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1315b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_oFFs_SUPPORTED 1316b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, 1317b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1318b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1319b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1320b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_pCAL_SUPPORTED 1321b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, 1322b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1323b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1324b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1325b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_pHYs_SUPPORTED 1326b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, 1327b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1328b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1329b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1330b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_sBIT_SUPPORTED 1331b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, 1332b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1333b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1334b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1335b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_sCAL_SUPPORTED 1336b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, 1337b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1338b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1339b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1340b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_sPLT_SUPPORTED 1341b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, 1342b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1343b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_READ_sPLT_SUPPORTED */ 1344b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1345b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_sRGB_SUPPORTED 1346b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, 1347b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1348b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1349b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1350b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_tEXt_SUPPORTED 1351b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, 1352b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1353b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1354b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1355b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_tIME_SUPPORTED 1356b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, 1357b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1358b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1359b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1360b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_tRNS_SUPPORTED 1361b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, 1362b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1363b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1364b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1365b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_zTXt_SUPPORTED 1366b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, 1367b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1368b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1369b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1370b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, 1371b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 chunk_name),PNG_EMPTY); 1372b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1373b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, 1374b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY); 1375b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This is the function that gets called for unknown chunks. The 'keep' 1376b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * argument is either non-zero for a known chunk that has been set to be 1377b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * handled as unknown or zero for an unknown chunk. By default the function 1378b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * just skips the chunk or errors out if it is critical. 1379b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1380b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1381b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\ 1382b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1383b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling, 1384b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY); 1385b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Exactly as the API png_handle_as_unknown() except that the argument is a 1386b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 32-bit chunk name, not a string. 1387b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1388b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */ 1389b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1390b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Handle the transformations for reading and writing */ 1391b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1392b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, 1393b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_row_infop row_info),PNG_EMPTY); 1394b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1395b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED 1396b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, 1397b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_row_infop row_info),PNG_EMPTY); 1398b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1399b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1400b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_TRANSFORMS_SUPPORTED 1401b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr), 1402b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1403b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1404b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1405b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1406b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, 1407b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1408b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, 1409b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1410b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); 1411b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, 1412b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 length),PNG_EMPTY); 1413b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr), 1414b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1415b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr), 1416b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1417b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, 1418b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1419b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); 1420b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, 1421b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); 1422b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr), 1423b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1424b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, 1425b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1426b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, 1427b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1428b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, 1429b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1430b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, 1431b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_bytep row),PNG_EMPTY); 1432b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, 1433b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1434b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, 1435b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1436b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr), 1437b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1438b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_tEXt_SUPPORTED 1439b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, 1440b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1441b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, 1442b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1443b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 1444b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_zTXt_SUPPORTED 1445b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, 1446b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1447b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, 1448b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1449b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 1450b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# ifdef PNG_READ_iTXt_SUPPORTED 1451b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, 1452b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); 1453b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, 1454b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr),PNG_EMPTY); 1455b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# endif 1456b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1457b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1458b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1459b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added at libpng version 1.6.0 */ 1460b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_GAMMA_SUPPORTED 1461b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr, 1462b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY); 1463b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Set the colorspace gamma with a value provided by the application or by 1464b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the gAMA chunk on read. The value will override anything set by an ICC 1465b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * profile. 1466b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1467b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1468b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, 1469b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr), PNG_EMPTY); 1470b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Synchronize the info 'valid' flags with the colorspace */ 1471b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1472b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, 1473b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_inforp info_ptr), PNG_EMPTY); 1474b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Copy the png_struct colorspace to the info_struct and call the above to 1475b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * synchronize the flags. Checks for NULL info_ptr and does nothing. 1476b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1477b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1478b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1479b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added at libpng version 1.4.0 */ 1480b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_COLORSPACE_SUPPORTED 1481b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* These internal functions are for maintaining the colorspace structure within 1482b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a png_info or png_struct (or, indeed, both). 1483b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1484b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, 1485b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, 1486b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int preferred), PNG_EMPTY); 1487b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1488b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, 1489b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, 1490b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int preferred), PNG_EMPTY); 1491b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1492b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_sRGB_SUPPORTED 1493b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, 1494b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, int intent), PNG_EMPTY); 1495b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* This does set the colorspace gAMA and cHRM values too, but doesn't set the 1496b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * flags to write them, if it returns false there was a problem and an error 1497b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * message has already been output (but the colorspace may still need to be 1498b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * synced to record the invalid flag). 1499b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1500b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* sRGB */ 1501b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1502b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_iCCP_SUPPORTED 1503b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, 1504b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, png_const_charp name, 1505b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 profile_length, png_const_bytep profile, int color_type), 1506b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1507b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The 'name' is used for information only */ 1508b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1509b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Routines for checking parts of an ICC profile. */ 1510b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, 1511b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, png_const_charp name, 1512b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 profile_length), PNG_EMPTY); 1513b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, 1514b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, png_const_charp name, 1515b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 profile_length, 1516b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep profile /* first 132 bytes only */, int color_type), 1517b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1518b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, 1519b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_colorspacerp colorspace, png_const_charp name, 1520b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 profile_length, 1521b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); 1522b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_sRGB_SUPPORTED 1523b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,( 1524b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_structrp png_ptr, png_colorspacerp colorspace, 1525b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep profile, uLong adler), PNG_EMPTY); 1526b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may 1527b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be zero to indicate that it is not available. It is used, if provided, 1528b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * as a fast check on the profile when checking to see if it is sRGB. 1529b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1530b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1531b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* iCCP */ 1532b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1533b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1534b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, 1535b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_structrp png_ptr), PNG_EMPTY); 1536b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Set the rgb_to_gray coefficients from the colorspace Y values */ 1537b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* READ_RGB_TO_GRAY */ 1538b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* COLORSPACE */ 1539b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1540b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added at libpng version 1.4.0 */ 1541b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, 1542b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_uint_32 width, png_uint_32 height, int bit_depth, 1543b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int color_type, int interlace_type, int compression_type, 1544b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int filter_type),PNG_EMPTY); 1545b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1546b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added at libpng version 1.5.10 */ 1547b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ 1548b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) 1549b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, 1550b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); 1551b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1552b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1553b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) 1554b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, 1555b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp name),PNG_NORETURN); 1556b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1557b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1558b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite 1559b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the end. Always leaves the buffer nul terminated. Never errors out (and 1560b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * there is no error code.) 1561b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1562b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, 1563b50c217251b086440efcdb273c22f86a06c80cbaChris Craik size_t pos, png_const_charp string),PNG_EMPTY); 1564b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1565b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Various internal functions to handle formatted warning messages, currently 1566b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * only implemented for warnings. 1567b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1568b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) 1569b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Utility to dump an unsigned value into a buffer, given a start pointer and 1570b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and end pointer (which should point just *beyond* the end of the buffer!) 1571b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Returns the pointer to the start of the formatted string. This utility only 1572b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does unsigned values. 1573b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1574b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, 1575b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); 1576b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1577b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Convenience macro that takes an array: */ 1578b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FORMAT_NUMBER(buffer,format,number) \ 1579b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_format_number(buffer, buffer + (sizeof buffer), format, number) 1580b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1581b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Suggested size for a number buffer (enough for 64 bits and a sign!) */ 1582b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_BUFFER_SIZE 24 1583b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1584b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* These are the integer formats currently supported, the name is formed from 1585b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the standard printf(3) format string. 1586b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1587b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ 1588b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_02u 2 1589b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ 1590b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_02d 2 1591b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_x 3 1592b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_02x 4 1593b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ 1594b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1595b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1596b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WARNINGS_SUPPORTED 1597b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* New defines and members adding in libpng-1.5.4 */ 1598b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_WARNING_PARAMETER_SIZE 32 1599b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ 1600b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1601b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* An l-value of this type has to be passed to the APIs below to cache the 1602b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * values of the parameters to a formatted warning message. 1603b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1604b50c217251b086440efcdb273c22f86a06c80cbaChris Craiktypedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ 1605b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_WARNING_PARAMETER_SIZE]; 1606b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1607b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, 1608b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int number, png_const_charp string),PNG_EMPTY); 1609b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, 1610b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * including the trailing '\0'. 1611b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1612b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, 1613b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_warning_parameters p, int number, int format, png_alloc_size_t value), 1614b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1615b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Use png_alloc_size_t because it is an unsigned type as big as any we 1616b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * need to output. Use the following for a signed value. 1617b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1618b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, 1619b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_warning_parameters p, int number, int format, png_int_32 value), 1620b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1621b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1622b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, 1623b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_warning_parameters p, png_const_charp message),PNG_EMPTY); 1624b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* 'message' follows the X/Open approach of using @1, @2 to insert 1625b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * parameters previously supplied using the above functions. Errors in 1626b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * specifying the parameters will simply result in garbage substitutions. 1627b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1628b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1629b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1630b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_BENIGN_ERRORS_SUPPORTED 1631b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Application errors (new in 1.6); use these functions (declared below) for 1632b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * errors in the parameters or order of API function calls on read. The 1633b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'warning' should be used for an error that can be handled completely; the 1634b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 'error' for one which can be handled safely but which may lose application 1635b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * information or settings. 1636b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1637b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * By default these both result in a png_error call prior to release, while in a 1638b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * released version the 'warning' is just a warning. However if the application 1639b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * explicitly disables benign errors (explicitly permitting the code to lose 1640b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * information) they both turn into warnings. 1641b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1642b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * If benign errors aren't supported they end up as the corresponding base call 1643b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * (png_warning or png_error.) 1644b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1645b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, 1646b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp message),PNG_EMPTY); 1647b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* The application provided invalid parameters to an API function or called 1648b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * an API function at the wrong time, libpng can completely recover. 1649b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1650b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1651b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, 1652b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp message),PNG_EMPTY); 1653b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* As above but libpng will ignore the call, or attempt some other partial 1654b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * recovery from the error. 1655b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1656b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 1657b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_app_warning(pp,s) png_warning(pp,s) 1658b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_app_error(pp,s) png_error(pp,s) 1659b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1660b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1661b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr, 1662b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp message, int error),PNG_EMPTY); 1663b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Report a recoverable issue in chunk data. On read this is used to report 1664b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a problem found while reading a particular chunk and the 1665b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_chunk_benign_error or png_chunk_warning function is used as 1666b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * appropriate. On write this is used to report an error that comes from 1667b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * data set via an application call to a png_set_ API and png_app_error or 1668b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * png_app_warning is used as appropriate. 1669b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1670b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The 'error' parameter must have one of the following values: 1671b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1672b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_WARNING 0 /* never an error */ 1673b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */ 1674b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_CHUNK_ERROR 2 /* always an error */ 1675b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1676b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* ASCII to FP interfaces, currently only implemented if sCAL 1677b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * support is required. 1678b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1679b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_sCAL_SUPPORTED) 1680b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* MAX_DIGITS is actually the maximum number of characters in an sCAL 1681b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * width or height, derived from the precision (number of significant 1682b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * digits - a build time settable option) and assumptions about the 1683b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * maximum ridiculous exponent. 1684b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1685b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) 1686b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1687b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FLOATING_POINT_SUPPORTED 1688b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, 1689b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_charp ascii, png_size_t size, double fp, unsigned int precision), 1690b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1691b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* FLOATING_POINT */ 1692b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1693b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FIXED_POINT_SUPPORTED 1694b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, 1695b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); 1696b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* FIXED_POINT */ 1697b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* sCAL */ 1698b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1699b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) 1700b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* An internal API to validate the format of a floating point number. 1701b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The result is the index of the next character. If the number is 1702b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not valid it will be the index of a character in the supposed number. 1703b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1704b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The format of a number is defined in the PNG extensions specification 1705b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * and this API is strictly conformant to that spec, not anyone elses! 1706b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1707b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The format as a regular expression is: 1708b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1709b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? 1710b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1711b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * or: 1712b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1713b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? 1714b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1715b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The complexity is that either integer or fraction must be present and the 1716b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * fraction is permitted to have no digits only if the integer is present. 1717b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1718b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * NOTE: The dangling E problem. 1719b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * There is a PNG valid floating point number in the following: 1720b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1721b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * PNG floating point numbers are not greedy. 1722b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1723b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Working this out requires *TWO* character lookahead (because of the 1724b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * sign), the parser does not do this - it will fail at the 'r' - this 1725b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * doesn't matter for PNG sCAL chunk values, but it requires more care 1726b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if the value were ever to be embedded in something more complex. Use 1727b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * ANSI-C strtod if you need the lookahead. 1728b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1729b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* State table for the parser. */ 1730b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_INTEGER 0 /* before or in integer */ 1731b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_FRACTION 1 /* before or in fraction */ 1732b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_EXPONENT 2 /* before or in exponent */ 1733b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_STATE 3 /* mask for the above */ 1734b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ 1735b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ 1736b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ 1737b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ 1738b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ 1739b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1740b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* These three values don't affect the parser. They are set but not used. 1741b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1742b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ 1743b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ 1744b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_NONZERO 256 /* A non-zero value */ 1745b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_STICKY 448 /* The above three flags */ 1746b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1747b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This is available for the caller to store in 'state' if required. Do not 1748b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * call the parser after setting it (the parser sometimes clears it.) 1749b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1750b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ 1751b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1752b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Result codes for the parser (boolean - true meants ok, false means 1753b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not ok yet.) 1754b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1755b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_MAYBE 0 /* The number may be valid in the future */ 1756b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_OK 1 /* The number is valid */ 1757b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1758b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Tests on the sticky non-zero and negative flags. To pass these checks 1759b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the state must also indicate that the whole number is valid - this is 1760b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this 1761b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is equivalent to PNG_FP_OK above.) 1762b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1763b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) 1764b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* NZ_MASK: the string is valid and a non-zero negative value */ 1765b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) 1766b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Z MASK: the string is valid and a non-zero value. */ 1767b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* PNG_FP_SAW_DIGIT: the string is valid. */ 1768b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) 1769b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) 1770b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) 1771b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1772b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The actual parser. This can be called repeatedly. It updates 1773b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the index into the string and the state variable (which must 1774b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * be initialized to 0). It returns a result code, as above. There 1775b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * is no point calling the parser any more if it fails to advance to 1776b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the end of the string - it is stuck on an invalid character (or 1777b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * terminated by '\0'). 1778b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1779b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * Note that the pointer will consume an E or even an E+ and then leave 1780b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a 'maybe' state even though a preceding integer.fraction is valid. 1781b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * The PNG_FP_WAS_VALID flag indicates that a preceding substring was 1782b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * a valid number. It's possible to recover from this by calling 1783b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the parser again (from the start, with state 0) but with a string 1784b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * that omits the last character (i.e. set the size to the index of 1785b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the problem character.) This has not been tested within libpng. 1786b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1787b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, 1788b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); 1789b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1790b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This is the same but it checks a complete string and returns true 1791b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * only if it just contains a floating point number. As of 1.5.4 this 1792b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * function also returns the state at the end of parsing the number if 1793b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * it was valid (otherwise it returns 0.) This can be used for testing 1794b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * for negative or zero values using the sticky flag. 1795b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1796b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, 1797b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t size),PNG_EMPTY); 1798b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* pCAL || sCAL */ 1799b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1800b478e66e7c2621eef5f465e4629ce642db00716bSireesh Tripurari#if defined(PNG_GAMMA_SUPPORTED) ||\ 1801b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) 1802b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Added at libpng version 1.5.0 */ 1803b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* This is a utility to provide a*times/div (rounded) and indicate 1804b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * if there is an overflow. The result is a boolean - false (0) 1805b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * for overflow, true (1) if no overflow, in which case *res 1806b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * holds the result. 1807b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1808b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, 1809b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); 1810b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1811b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1812b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) 1813b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Same deal, but issue a warning on overflow and return 0. */ 1814b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, 1815b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, 1816b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_int_32 divided_by),PNG_EMPTY); 1817b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1818b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1819b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_GAMMA_SUPPORTED 1820b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Calculate a reciprocal - used for gamma values. This returns 1821b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 0 if the argument is 0 in order to maintain an undefined value; 1822b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * there are no warnings. 1823b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1824b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), 1825b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1826b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1827b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_GAMMA_SUPPORTED 1828b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The same but gives a reciprocal of the product of two fixed point 1829b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * values. Accuracy is suitable for gamma calculations but this is 1830b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * not exact - use png_muldiv for that. Only required at present on read. 1831b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1832b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, 1833b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_fixed_point b),PNG_EMPTY); 1834b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1835b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1836b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Return true if the gamma value is significantly different from 1.0 */ 1837b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), 1838b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1839b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1840b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1841b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_READ_GAMMA_SUPPORTED 1842b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Internal fixed point gamma correction. These APIs are called as 1843b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * required to convert single values - they don't need to be fast, 1844b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * they are not used when processing image pixel values. 1845b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * 1846b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * While the input is an 'unsigned' value it must actually be the 1847b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * correct bit value - 0..255 or 0..65535 as required. 1848b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1849b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, 1850b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); 1851b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, 1852b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_fixed_point gamma_value),PNG_EMPTY); 1853b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, 1854b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_fixed_point gamma_value),PNG_EMPTY); 1855b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), 1856b50c217251b086440efcdb273c22f86a06c80cbaChris Craik PNG_EMPTY); 1857b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, 1858b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int bit_depth),PNG_EMPTY); 1859b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1860b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1861b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* SIMPLIFIED READ/WRITE SUPPORT */ 1862b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\ 1863b50c217251b086440efcdb273c22f86a06c80cbaChris Craik defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) 1864b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* The internal structure that png_image::opaque points to. */ 1865b50c217251b086440efcdb273c22f86a06c80cbaChris Craiktypedef struct png_control 1866b50c217251b086440efcdb273c22f86a06c80cbaChris Craik{ 1867b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_structp png_ptr; 1868b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_infop info_ptr; 1869b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_voidp error_buf; /* Always a jmp_buf at present. */ 1870b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1871b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_bytep memory; /* Memory buffer. */ 1872b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_size_t size; /* Size of the memory buffer. */ 1873b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1874b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int for_write :1; /* Otherwise it is a read structure */ 1875b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int owned_file :1; /* We own the file in io_ptr */ 1876b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} png_control; 1877b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1878b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Return the pointer to the jmp_buf from a png_control: necessary because C 1879b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * does not reveal the type of the elements of jmp_buf. 1880b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1881b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef __cplusplus 1882b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) 1883b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 1884b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_control_jmp_buf(pc) ((pc)->error_buf) 1885b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1886b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1887b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Utility to safely execute a piece of libpng code catching and logging any 1888b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * errors that might occur. Returns true on success, false on failure (either 1889b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * of the function or as a result of a png_error.) 1890b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1891b478e66e7c2621eef5f465e4629ce642db00716bSireesh TripurariPNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr, 1892b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp error_message),PNG_NORETURN); 1893b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1894b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_WARNINGS_SUPPORTED 1895b478e66e7c2621eef5f465e4629ce642db00716bSireesh TripurariPNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr, 1896b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp warning_message),PNG_EMPTY); 1897b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 1898b50c217251b086440efcdb273c22f86a06c80cbaChris Craik# define png_safe_warning 0/*dummy argument*/ 1899b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1900b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1901b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, 1902b50c217251b086440efcdb273c22f86a06c80cbaChris Craik int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); 1903b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1904b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Utility to log an error; this also cleans up the png_image; the function 1905b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * always returns 0 (false). 1906b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1907b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, 1908b50c217251b086440efcdb273c22f86a06c80cbaChris Craik png_const_charp error_message),PNG_EMPTY); 1909b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1910b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifndef PNG_SIMPLIFIED_READ_SUPPORTED 1911b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* png_image_free is used by the write code but not exported */ 1912b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY); 1913b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* !SIMPLIFIED_READ */ 1914b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1915b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* SIMPLIFIED READ/WRITE */ 1916b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1917b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* These are initialization functions for hardware specific PNG filter 1918b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * optimizations; list these here then select the appropriate one at compile 1919b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined 1920b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the generic code is used. 1921b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1922b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef PNG_FILTER_OPTIMIZATIONS 1923b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr, 1924b50c217251b086440efcdb273c22f86a06c80cbaChris Craik unsigned int bpp), PNG_EMPTY); 1925b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* Just declare the optimization that will be used */ 1926b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#else 1927b50c217251b086440efcdb273c22f86a06c80cbaChris Craik /* List *all* the possible optimizations here - this branch is required if 1928b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in 1929b50c217251b086440efcdb273c22f86a06c80cbaChris Craik * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing. 1930b50c217251b086440efcdb273c22f86a06c80cbaChris Craik */ 1931b50c217251b086440efcdb273c22f86a06c80cbaChris CraikPNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon, 1932b50c217251b086440efcdb273c22f86a06c80cbaChris Craik (png_structp png_ptr, unsigned int bpp), PNG_EMPTY); 1933b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1934b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1935b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#ifdef PNG_INDEX_SUPPORTED 1936b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh TripurariPNG_INTERNAL_FUNCTION(void, png_seek_data, (png_structp png_ptr, 1937b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_uint_32 length), PNG_EMPTY); 1938b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh TripurariPNG_INTERNAL_FUNCTION(int, png_opt_crc_finish,(png_structrp png_ptr, 1939b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari png_uint_32 skip), PNG_EMPTY); 1940b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh TripurariPNG_INTERNAL_FUNCTION(void, png_set_interlaced_pass,(png_structrp png_ptr, 1941b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari int pass), PNG_EMPTY); 1942b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari#endif 1943b0277d0706e596e9a1dd889903f8ceb2680bcadbSireesh Tripurari 1944b50c217251b086440efcdb273c22f86a06c80cbaChris Craik/* Maintainer: Put new private prototypes here ^ */ 1945b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1946b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#include "pngdebug.h" 1947b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1948b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#ifdef __cplusplus 1949b50c217251b086440efcdb273c22f86a06c80cbaChris Craik} 1950b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif 1951b50c217251b086440efcdb273c22f86a06c80cbaChris Craik 1952b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNG_VERSION_INFO_ONLY */ 1953b50c217251b086440efcdb273c22f86a06c80cbaChris Craik#endif /* PNGPRIV_H */ 1954