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2296
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1
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2 /* pngpriv.h - private declarations for use inside libpng
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3 *
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4 * For conditions of distribution and use, see copyright notice in png.h
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5 * Copyright (c) 1998-2014 Glenn Randers-Pehrson
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6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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8 *
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9 * Last changed in libpng 1.6.10 [March 6, 2014]
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10 *
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11 * This code is released under the libpng license.
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12 * For conditions of distribution and use, see the disclaimer
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13 * and license in png.h
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14 */
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15
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16 /* The symbols declared in this file (including the functions declared
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17 * as extern) are PRIVATE. They are not part of the libpng public
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18 * interface, and are not recommended for use by regular applications.
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19 * Some of them may become public in the future; others may stay private,
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20 * change in an incompatible way, or even disappear.
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21 * Although the libpng users are not forbidden to include this header,
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22 * they should be well aware of the issues that may arise from doing so.
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23 */
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24
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25 #ifndef PNGPRIV_H
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26 #define PNGPRIV_H
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27
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28 /* Feature Test Macros. The following are defined here to ensure that correctly
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29 * implemented libraries reveal the APIs libpng needs to build and hide those
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30 * that are not needed and potentially damaging to the compilation.
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31 *
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32 * Feature Test Macros must be defined before any system header is included (see
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33 * POSIX 1003.1 2.8.2 "POSIX Symbols."
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34 *
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35 * These macros only have an effect if the operating system supports either
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36 * POSIX 1003.1 or C99, or both. On other operating systems (particularly
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37 * Windows/Visual Studio) there is no effect; the OS specific tests below are
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38 * still required (as of 2011-05-02.)
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39 */
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40 #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
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41
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42 #ifndef PNG_VERSION_INFO_ONLY
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43 /* Standard library headers not required by png.h: */
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44 # include <stdlib.h>
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45 # include <string.h>
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46 #endif
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47
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48 #define PNGLIB_BUILD /*libpng is being built, not used*/
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49
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50 /* If HAVE_CONFIG_H is defined during the build then the build system must
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51 * provide an appropriate "config.h" file on the include path. The header file
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52 * must provide definitions as required below (search for "HAVE_CONFIG_H");
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53 * see configure.ac for more details of the requirements. The macro
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54 * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on
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55 * 'configure'; define this macro to prevent the configure build including the
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56 * configure generated config.h. Libpng is expected to compile without *any*
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57 * special build system support on a reasonably ANSI-C compliant system.
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58 */
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59 #if defined(HAVE_CONFIG_H) && !defined(PNG_NO_CONFIG_H)
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60 # include <config.h>
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61
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62 /* Pick up the definition of 'restrict' from config.h if it was read: */
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63 # define PNG_RESTRICT restrict
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64 #endif
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65
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66 /* To support symbol prefixing it is necessary to know *before* including png.h
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67 * whether the fixed point (and maybe other) APIs are exported, because if they
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68 * are not internal definitions may be required. This is handled below just
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69 * before png.h is included, but load the configuration now if it is available.
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70 */
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71 #ifndef PNGLCONF_H
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72 # include "pnglibconf.h"
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73 #endif
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74
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75 /* Local renames may change non-exported API functions from png.h */
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76 #if defined(PNG_PREFIX) && !defined(PNGPREFIX_H)
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77 # include "pngprefix.h"
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78 #endif
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79
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80 #ifdef PNG_USER_CONFIG
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81 # include "pngusr.h"
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82 /* These should have been defined in pngusr.h */
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83 # ifndef PNG_USER_PRIVATEBUILD
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84 # define PNG_USER_PRIVATEBUILD "Custom libpng build"
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85 # endif
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86 # ifndef PNG_USER_DLLFNAME_POSTFIX
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87 # define PNG_USER_DLLFNAME_POSTFIX "Cb"
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88 # endif
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89 #endif
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90
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91 /* Compile time options.
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92 * =====================
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93 * In a multi-arch build the compiler may compile the code several times for the
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94 * same object module, producing different binaries for different architectures.
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95 * When this happens configure-time setting of the target host options cannot be
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96 * done and this interferes with the handling of the ARM NEON optimizations, and
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97 * possibly other similar optimizations. Put additional tests here; in general
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98 * this is needed when the same option can be changed at both compile time and
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99 * run time depending on the target OS (i.e. iOS vs Android.)
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100 *
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101 * NOTE: symbol prefixing does not pass $(CFLAGS) to the preprocessor, because
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102 * this is not possible with certain compilers (Oracle SUN OS CC), as a result
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103 * it is necessary to ensure that all extern functions that *might* be used
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104 * regardless of $(CFLAGS) get declared in this file. The test on __ARM_NEON__
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105 * below is one example of this behavior because it is controlled by the
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106 * presence or not of -mfpu=neon on the GCC command line, it is possible to do
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107 * this in $(CC), e.g. "CC=gcc -mfpu=neon", but people who build libpng rarely
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108 * do this.
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109 */
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110 #ifndef PNG_ARM_NEON_OPT
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111 /* ARM NEON optimizations are being controlled by the compiler settings,
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112 * typically the target FPU. If the FPU has been set to NEON (-mfpu=neon
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113 * with GCC) then the compiler will define __ARM_NEON__ and we can rely
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114 * unconditionally on NEON instructions not crashing, otherwise we must
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115 * disable use of NEON instructions.
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116 *
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117 * NOTE: at present these optimizations depend on 'ALIGNED_MEMORY', so they
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118 * can only be turned on automatically if that is supported too. If
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119 * PNG_ARM_NEON_OPT is set in CPPFLAGS (to >0) then arm/arm_init.c will fail
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120 * to compile with an appropriate #error if ALIGNED_MEMORY has been turned
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121 * off.
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122 */
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123 # if defined(__ARM_NEON__) && defined(PNG_ALIGNED_MEMORY_SUPPORTED)
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124 # define PNG_ARM_NEON_OPT 2
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125 # else
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126 # define PNG_ARM_NEON_OPT 0
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127 # endif
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128 #endif
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129
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130 #if PNG_ARM_NEON_OPT > 0
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131 /* NEON optimizations are to be at least considered by libpng, so enable the
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132 * callbacks to do this.
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133 */
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134 # define PNG_FILTER_OPTIMIZATIONS png_init_filter_functions_neon
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135
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136 /* By default the 'intrinsics' code in arm/filter_neon_intrinsics.c is used
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137 * if possible - if __ARM_NEON__ is set and the compiler version is not known
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138 * to be broken. This is controlled by PNG_ARM_NEON_IMPLEMENTATION which can
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139 * be:
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140 *
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141 * 1 The intrinsics code (the default with __ARM_NEON__)
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142 * 2 The hand coded assembler (the default without __ARM_NEON__)
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143 *
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144 * It is possible to set PNG_ARM_NEON_IMPLEMENTATION in CPPFLAGS, however
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145 * this is *NOT* supported and may cease to work even after a minor revision
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146 * to libpng. It *is* valid to do this for testing purposes, e.g. speed
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147 * testing or a new compiler, but the results should be communicated to the
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148 * libpng implementation list for incorporation in the next minor release.
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149 */
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150 # ifndef PNG_ARM_NEON_IMPLEMENTATION
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151 # ifdef __ARM_NEON__
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152 # if defined(__clang__)
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153 /* At present it is unknown by the libpng developers which versions
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154 * of clang support the intrinsics, however some or perhaps all
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155 * versions do not work with the assembler so this may be
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156 * irrelevant, so just use the default (do nothing here.)
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157 */
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158 # elif defined(__GNUC__)
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159 /* GCC 4.5.4 NEON support is known to be broken. 4.6.3 is known to
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160 * work, so if this *is* GCC, or G++, look for a version >4.5
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161 */
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162 # if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6)
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163 # define PNG_ARM_NEON_IMPLEMENTATION 2
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164 # endif /* no GNUC support */
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165 # endif /* __GNUC__ */
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166 # else /* !defined __ARM_NEON__ */
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167 /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
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168 */
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169 # define PNG_ARM_NEON_IMPLEMENTATION 2
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170 # endif /* __ARM_NEON__ */
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171 # endif /* !defined PNG_ARM_NEON_IMPLEMENTATION */
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172
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173 # ifndef PNG_ARM_NEON_IMPLEMENTATION
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174 /* Use the intrinsics code by default. */
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175 # define PNG_ARM_NEON_IMPLEMENTATION 1
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176 # endif
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177 #endif /* PNG_ARM_NEON_OPT > 0 */
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178
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179 /* Is this a build of a DLL where compilation of the object modules requires
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180 * different preprocessor settings to those required for a simple library? If
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181 * so PNG_BUILD_DLL must be set.
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182 *
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183 * If libpng is used inside a DLL but that DLL does not export the libpng APIs
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184 * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a
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185 * static library of libpng then link the DLL against that.
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186 */
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187 #ifndef PNG_BUILD_DLL
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188 # ifdef DLL_EXPORT
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189 /* This is set by libtool when files are compiled for a DLL; libtool
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190 * always compiles twice, even on systems where it isn't necessary. Set
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191 * PNG_BUILD_DLL in case it is necessary:
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192 */
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193 # define PNG_BUILD_DLL
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194 # else
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195 # ifdef _WINDLL
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196 /* This is set by the Microsoft Visual Studio IDE in projects that
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197 * build a DLL. It can't easily be removed from those projects (it
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198 * isn't visible in the Visual Studio UI) so it is a fairly reliable
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199 * indication that PNG_IMPEXP needs to be set to the DLL export
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200 * attributes.
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201 */
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202 # define PNG_BUILD_DLL
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203 # else
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204 # ifdef __DLL__
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205 /* This is set by the Borland C system when compiling for a DLL
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206 * (as above.)
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207 */
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208 # define PNG_BUILD_DLL
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209 # else
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210 /* Add additional compiler cases here. */
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211 # endif
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212 # endif
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213 # endif
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214 #endif /* Setting PNG_BUILD_DLL if required */
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215
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216 /* See pngconf.h for more details: the builder of the library may set this on
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217 * the command line to the right thing for the specific compilation system or it
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218 * may be automagically set above (at present we know of no system where it does
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219 * need to be set on the command line.)
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220 *
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221 * PNG_IMPEXP must be set here when building the library to prevent pngconf.h
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222 * setting it to the "import" setting for a DLL build.
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223 */
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224 #ifndef PNG_IMPEXP
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225 # ifdef PNG_BUILD_DLL
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226 # define PNG_IMPEXP PNG_DLL_EXPORT
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227 # else
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228 /* Not building a DLL, or the DLL doesn't require specific export
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229 * definitions.
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230 */
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231 # define PNG_IMPEXP
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232 # endif
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233 #endif
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234
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235 /* No warnings for private or deprecated functions in the build: */
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236 #ifndef PNG_DEPRECATED
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237 # define PNG_DEPRECATED
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238 #endif
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239 #ifndef PNG_PRIVATE
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240 # define PNG_PRIVATE
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241 #endif
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242
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243 /* Symbol preprocessing support.
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244 *
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245 * To enable listing global, but internal, symbols the following macros should
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246 * always be used to declare an extern data or function object in this file.
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247 */
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248 #ifndef PNG_INTERNAL_DATA
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249 # define PNG_INTERNAL_DATA(type, name, array) extern type name array
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250 #endif
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251
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252 #ifndef PNG_INTERNAL_FUNCTION
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253 # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\
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254 extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes)
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255 #endif
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256
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257 #ifndef PNG_INTERNAL_CALLBACK
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258 # define PNG_INTERNAL_CALLBACK(type, name, args, attributes)\
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259 extern PNG_FUNCTION(type, (PNGCBAPI name), args, PNG_EMPTY attributes)
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260 #endif
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261
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262 /* If floating or fixed point APIs are disabled they may still be compiled
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263 * internally. To handle this make sure they are declared as the appropriate
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264 * internal extern function (otherwise the symbol prefixing stuff won't work and
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265 * the functions will be used without definitions.)
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266 *
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267 * NOTE: although all the API functions are declared here they are not all
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268 * actually built! Because the declarations are still made it is necessary to
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269 * fake out types that they depend on.
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270 */
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271 #ifndef PNG_FP_EXPORT
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272 # ifndef PNG_FLOATING_POINT_SUPPORTED
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273 # define PNG_FP_EXPORT(ordinal, type, name, args)\
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274 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
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275 # ifndef PNG_VERSION_INFO_ONLY
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276 typedef struct png_incomplete png_double;
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277 typedef png_double* png_doublep;
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278 typedef const png_double* png_const_doublep;
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279 typedef png_double** png_doublepp;
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280 # endif
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281 # endif
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282 #endif
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283 #ifndef PNG_FIXED_EXPORT
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284 # ifndef PNG_FIXED_POINT_SUPPORTED
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285 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
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286 PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY);
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287 # endif
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288 #endif
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289
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290 #include "png.h"
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291
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292 /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */
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293 #ifndef PNG_DLL_EXPORT
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294 # define PNG_DLL_EXPORT
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295 #endif
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296
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297 /* SECURITY and SAFETY:
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298 *
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299 * By default libpng is built without any internal limits on image size,
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300 * individual heap (png_malloc) allocations or the total amount of memory used.
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301 * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used
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302 * (unless individually overridden). These limits are believed to be fairly
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303 * safe, but builders of secure systems should verify the values against the
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304 * real system capabilities.
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305 */
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306 #ifdef PNG_SAFE_LIMITS_SUPPORTED
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307 /* 'safe' limits */
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308 # ifndef PNG_USER_WIDTH_MAX
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309 # define PNG_USER_WIDTH_MAX 1000000
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310 # endif
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311 # ifndef PNG_USER_HEIGHT_MAX
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312 # define PNG_USER_HEIGHT_MAX 1000000
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313 # endif
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314 # ifndef PNG_USER_CHUNK_CACHE_MAX
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315 # define PNG_USER_CHUNK_CACHE_MAX 128
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316 # endif
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317 # ifndef PNG_USER_CHUNK_MALLOC_MAX
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318 # define PNG_USER_CHUNK_MALLOC_MAX 8000000
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319 # endif
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320 #else
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321 /* values for no limits */
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322 # ifndef PNG_USER_WIDTH_MAX
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323 # define PNG_USER_WIDTH_MAX 0x7fffffff
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324 # endif
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325 # ifndef PNG_USER_HEIGHT_MAX
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326 # define PNG_USER_HEIGHT_MAX 0x7fffffff
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327 # endif
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328 # ifndef PNG_USER_CHUNK_CACHE_MAX
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329 # define PNG_USER_CHUNK_CACHE_MAX 0
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330 # endif
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331 # ifndef PNG_USER_CHUNK_MALLOC_MAX
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332 # define PNG_USER_CHUNK_MALLOC_MAX 0
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333 # endif
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334 #endif
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335
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336 /* Moved to pngpriv.h at libpng-1.5.0 */
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337 /* NOTE: some of these may have been used in external applications as
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338 * these definitions were exposed in pngconf.h prior to 1.5.
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339 */
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340
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341 /* If you are running on a machine where you cannot allocate more
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342 * than 64K of memory at once, uncomment this. While libpng will not
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343 * normally need that much memory in a chunk (unless you load up a very
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344 * large file), zlib needs to know how big of a chunk it can use, and
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345 * libpng thus makes sure to check any memory allocation to verify it
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346 * will fit into memory.
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347 *
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348 * zlib provides 'MAXSEG_64K' which, if defined, indicates the
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349 * same limit and pngconf.h (already included) sets the limit
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350 * if certain operating systems are detected.
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351 */
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352 #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
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353 # define PNG_MAX_MALLOC_64K
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354 #endif
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355
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356 #ifndef PNG_UNUSED
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357 /* Unused formal parameter warnings are silenced using the following macro
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358 * which is expected to have no bad effects on performance (optimizing
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359 * compilers will probably remove it entirely). Note that if you replace
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360 * it with something other than whitespace, you must include the terminating
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361 * semicolon.
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362 */
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363 # define PNG_UNUSED(param) (void)param;
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364 #endif
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365
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366 /* Just a little check that someone hasn't tried to define something
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367 * contradictory.
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368 */
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369 #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
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370 # undef PNG_ZBUF_SIZE
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371 # define PNG_ZBUF_SIZE 65536L
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372 #endif
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373
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374 /* If warnings or errors are turned off the code is disabled or redirected here.
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375 * From 1.5.4 functions have been added to allow very limited formatting of
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376 * error and warning messages - this code will also be disabled here.
|
|
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377 */
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|
|
378 #ifdef PNG_WARNINGS_SUPPORTED
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379 # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;
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380 #else
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381 # define png_warning_parameter(p,number,string) ((void)0)
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382 # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)
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383 # define png_warning_parameter_signed(p,number,format,value) ((void)0)
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|
384 # define png_formatted_warning(pp,p,message) ((void)(pp))
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|
385 # define PNG_WARNING_PARAMETERS(p)
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|
386 #endif
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|
387 #ifndef PNG_ERROR_TEXT_SUPPORTED
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|
388 # define png_fixed_error(s1,s2) png_err(s1)
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|
389 #endif
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390
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391 /* C allows up-casts from (void*) to any pointer and (const void*) to any
|
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|
392 * pointer to a const object. C++ regards this as a type error and requires an
|
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|
393 * explicit, static, cast and provides the static_cast<> rune to ensure that
|
|
|
394 * const is not cast away.
|
|
|
395 */
|
|
|
396 #ifdef __cplusplus
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|
397 # define png_voidcast(type, value) static_cast<type>(value)
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|
398 # define png_constcast(type, value) const_cast<type>(value)
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|
399 # define png_aligncast(type, value) \
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|
400 static_cast<type>(static_cast<void*>(value))
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401 # define png_aligncastconst(type, value) \
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|
402 static_cast<type>(static_cast<const void*>(value))
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|
403 #else
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|
404 # define png_voidcast(type, value) (value)
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|
405 # define png_constcast(type, value) ((type)(value))
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|
406 # define png_aligncast(type, value) ((void*)(value))
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|
407 # define png_aligncastconst(type, value) ((const void*)(value))
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|
|
408 #endif /* __cplusplus */
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409
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|
410 /* Some fixed point APIs are still required even if not exported because
|
|
|
411 * they get used by the corresponding floating point APIs. This magic
|
|
|
412 * deals with this:
|
|
|
413 */
|
|
|
414 #ifdef PNG_FIXED_POINT_SUPPORTED
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|
|
415 # define PNGFAPI PNGAPI
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|
|
416 #else
|
|
|
417 # define PNGFAPI /* PRIVATE */
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|
|
418 #endif
|
|
|
419
|
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|
420 #ifndef PNG_VERSION_INFO_ONLY
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|
421 /* Other defines specific to compilers can go here. Try to keep
|
|
|
422 * them inside an appropriate ifdef/endif pair for portability.
|
|
|
423 */
|
|
|
424 #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\
|
|
|
425 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)
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|
|
426 /* png.c requires the following ANSI-C constants if the conversion of
|
|
|
427 * floating point to ASCII is implemented therein:
|
|
|
428 *
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|
|
429 * DBL_DIG Maximum number of decimal digits (can be set to any constant)
|
|
|
430 * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)
|
|
|
431 * DBL_MAX Maximum floating point number (can be set to an arbitrary value)
|
|
|
432 */
|
|
|
433 # include <float.h>
|
|
|
434
|
|
|
435 # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
|
|
|
436 defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
|
|
|
437 /* We need to check that <math.h> hasn't already been included earlier
|
|
|
438 * as it seems it doesn't agree with <fp.h>, yet we should really use
|
|
|
439 * <fp.h> if possible.
|
|
|
440 */
|
|
|
441 # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
|
|
|
442 # include <fp.h>
|
|
|
443 # endif
|
|
|
444 # else
|
|
|
445 # include <math.h>
|
|
|
446 # endif
|
|
|
447 # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
|
|
|
448 /* Amiga SAS/C: We must include builtin FPU functions when compiling using
|
|
|
449 * MATH=68881
|
|
|
450 */
|
|
|
451 # include <m68881.h>
|
|
|
452 # endif
|
|
|
453 #endif
|
|
|
454
|
|
|
455 /* This provides the non-ANSI (far) memory allocation routines. */
|
|
|
456 #if defined(__TURBOC__) && defined(__MSDOS__)
|
|
|
457 # include <mem.h>
|
|
|
458 # include <alloc.h>
|
|
|
459 #endif
|
|
|
460
|
|
|
461 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
|
|
|
462 defined(_WIN32) || defined(__WIN32__)
|
|
|
463 # include <windows.h> /* defines _WINDOWS_ macro */
|
|
|
464 #endif
|
|
|
465 #endif /* PNG_VERSION_INFO_ONLY */
|
|
|
466
|
|
|
467 /* Moved here around 1.5.0beta36 from pngconf.h */
|
|
|
468 /* Users may want to use these so they are not private. Any library
|
|
|
469 * functions that are passed far data must be model-independent.
|
|
|
470 */
|
|
|
471
|
|
|
472 /* Memory model/platform independent fns */
|
|
|
473 #ifndef PNG_ABORT
|
|
|
474 # ifdef _WINDOWS_
|
|
|
475 # define PNG_ABORT() ExitProcess(0)
|
|
|
476 # else
|
|
|
477 # define PNG_ABORT() abort()
|
|
|
478 # endif
|
|
|
479 #endif
|
|
|
480
|
|
|
481 /* These macros may need to be architecture dependent. */
|
|
|
482 #define PNG_ALIGN_NONE 0 /* do not use data alignment */
|
|
|
483 #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */
|
|
|
484 #ifdef offsetof
|
|
|
485 # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */
|
|
|
486 #else
|
|
|
487 # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */
|
|
|
488 #endif
|
|
|
489 #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */
|
|
|
490
|
|
|
491 #ifndef PNG_ALIGN_TYPE
|
|
|
492 /* Default to using aligned access optimizations and requiring alignment to a
|
|
|
493 * multiple of the data type size. Override in a compiler specific fashion
|
|
|
494 * if necessary by inserting tests here:
|
|
|
495 */
|
|
|
496 # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE
|
|
|
497 #endif
|
|
|
498
|
|
|
499 #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE
|
|
|
500 /* This is used because in some compiler implementations non-aligned
|
|
|
501 * structure members are supported, so the offsetof approach below fails.
|
|
|
502 * Set PNG_ALIGN_SIZE=0 for compiler combinations where unaligned access
|
|
|
503 * is good for performance. Do not do this unless you have tested the result
|
|
|
504 * and understand it.
|
|
|
505 */
|
|
|
506 # define png_alignof(type) (sizeof (type))
|
|
|
507 #else
|
|
|
508 # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET
|
|
|
509 # define png_alignof(type) offsetof(struct{char c; type t;}, t)
|
|
|
510 # else
|
|
|
511 # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS
|
|
|
512 # define png_alignof(type) (1)
|
|
|
513 # endif
|
|
|
514 /* Else leave png_alignof undefined to prevent use thereof */
|
|
|
515 # endif
|
|
|
516 #endif
|
|
|
517
|
|
|
518 /* This implicitly assumes alignment is always to a power of 2. */
|
|
|
519 #ifdef png_alignof
|
|
|
520 # define png_isaligned(ptr, type)\
|
|
|
521 ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)
|
|
|
522 #else
|
|
|
523 # define png_isaligned(ptr, type) 0
|
|
|
524 #endif
|
|
|
525
|
|
|
526 /* End of memory model/platform independent support */
|
|
|
527 /* End of 1.5.0beta36 move from pngconf.h */
|
|
|
528
|
|
|
529 /* CONSTANTS and UTILITY MACROS
|
|
|
530 * These are used internally by libpng and not exposed in the API
|
|
|
531 */
|
|
|
532
|
|
|
533 /* Various modes of operation. Note that after an init, mode is set to
|
|
|
534 * zero automatically when the structure is created. Three of these
|
|
|
535 * are defined in png.h because they need to be visible to applications
|
|
|
536 * that call png_set_unknown_chunk().
|
|
|
537 */
|
|
|
538 /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */
|
|
|
539 /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */
|
|
|
540 #define PNG_HAVE_IDAT 0x04
|
|
|
541 /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */
|
|
|
542 #define PNG_HAVE_IEND 0x10
|
|
|
543 /* 0x20 (unused) */
|
|
|
544 /* 0x40 (unused) */
|
|
|
545 /* 0x80 (unused) */
|
|
|
546 #define PNG_HAVE_CHUNK_HEADER 0x100
|
|
|
547 #define PNG_WROTE_tIME 0x200
|
|
|
548 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
|
|
|
549 #define PNG_BACKGROUND_IS_GRAY 0x800
|
|
|
550 #define PNG_HAVE_PNG_SIGNATURE 0x1000
|
|
|
551 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
|
|
|
552 /* 0x4000 (unused) */
|
|
|
553 #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */
|
|
|
554
|
|
|
555 /* Flags for the transformations the PNG library does on the image data */
|
|
|
556 #define PNG_BGR 0x0001
|
|
|
557 #define PNG_INTERLACE 0x0002
|
|
|
558 #define PNG_PACK 0x0004
|
|
|
559 #define PNG_SHIFT 0x0008
|
|
|
560 #define PNG_SWAP_BYTES 0x0010
|
|
|
561 #define PNG_INVERT_MONO 0x0020
|
|
|
562 #define PNG_QUANTIZE 0x0040
|
|
|
563 #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */
|
|
|
564 #define PNG_BACKGROUND_EXPAND 0x0100
|
|
|
565 #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */
|
|
|
566 #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */
|
|
|
567 #define PNG_RGBA 0x0800
|
|
|
568 #define PNG_EXPAND 0x1000
|
|
|
569 #define PNG_GAMMA 0x2000
|
|
|
570 #define PNG_GRAY_TO_RGB 0x4000
|
|
|
571 #define PNG_FILLER 0x8000
|
|
|
572 #define PNG_PACKSWAP 0x10000
|
|
|
573 #define PNG_SWAP_ALPHA 0x20000
|
|
|
574 #define PNG_STRIP_ALPHA 0x40000
|
|
|
575 #define PNG_INVERT_ALPHA 0x80000
|
|
|
576 #define PNG_USER_TRANSFORM 0x100000
|
|
|
577 #define PNG_RGB_TO_GRAY_ERR 0x200000
|
|
|
578 #define PNG_RGB_TO_GRAY_WARN 0x400000
|
|
|
579 #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */
|
|
|
580 #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */
|
|
|
581 #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */
|
|
|
582 #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */
|
|
|
583 #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */
|
|
|
584 /* 0x8000000 unused */
|
|
|
585 /* 0x10000000 unused */
|
|
|
586 /* 0x20000000 unused */
|
|
|
587 /* 0x40000000 unused */
|
|
|
588 /* Flags for png_create_struct */
|
|
|
589 #define PNG_STRUCT_PNG 0x0001
|
|
|
590 #define PNG_STRUCT_INFO 0x0002
|
|
|
591
|
|
|
592 /* Scaling factor for filter heuristic weighting calculations */
|
|
|
593 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
|
|
|
594 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
|
|
|
595
|
|
|
596 /* Flags for the png_ptr->flags rather than declaring a byte for each one */
|
|
|
597 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
|
|
|
598 #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */
|
|
|
599 /* 0x0004 unused */
|
|
|
600 #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */
|
|
|
601 /* 0x0010 unused */
|
|
|
602 /* 0x0020 unused */
|
|
|
603 #define PNG_FLAG_ROW_INIT 0x0040
|
|
|
604 #define PNG_FLAG_FILLER_AFTER 0x0080
|
|
|
605 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
|
|
|
606 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
|
|
|
607 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
|
|
|
608 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
|
|
|
609 #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */
|
|
|
610 #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */
|
|
|
611 #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */
|
|
|
612 /* #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 */
|
|
|
613 /* #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 */
|
|
|
614 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000
|
|
|
615 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000
|
|
|
616 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000
|
|
|
617 #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */
|
|
|
618 #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */
|
|
|
619 #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */
|
|
|
620 /* 0x800000 unused */
|
|
|
621 /* 0x1000000 unused */
|
|
|
622 /* 0x2000000 unused */
|
|
|
623 /* 0x4000000 unused */
|
|
|
624 /* 0x8000000 unused */
|
|
|
625 /* 0x10000000 unused */
|
|
|
626 /* 0x20000000 unused */
|
|
|
627 /* 0x40000000 unused */
|
|
|
628
|
|
|
629 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
|
|
|
630 PNG_FLAG_CRC_ANCILLARY_NOWARN)
|
|
|
631
|
|
|
632 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
|
|
|
633 PNG_FLAG_CRC_CRITICAL_IGNORE)
|
|
|
634
|
|
|
635 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
|
|
|
636 PNG_FLAG_CRC_CRITICAL_MASK)
|
|
|
637
|
|
|
638 /* Save typing and make code easier to understand */
|
|
|
639
|
|
|
640 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
|
|
|
641 abs((int)((c1).green) - (int)((c2).green)) + \
|
|
|
642 abs((int)((c1).blue) - (int)((c2).blue)))
|
|
|
643
|
|
|
644 /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255
|
|
|
645 * by dividing by 257 *with rounding*. This macro is exact for the given range.
|
|
|
646 * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the
|
|
|
647 * macro were established by experiment (modifying the added value). The macro
|
|
|
648 * has a second variant that takes a value already scaled by 255 and divides by
|
|
|
649 * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it
|
|
|
650 * only gives off-by-one errors and only for 0.5% (1 in 200) of the values.
|
|
|
651 */
|
|
|
652 #define PNG_DIV65535(v24) (((v24) + 32895) >> 16)
|
|
|
653 #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255)
|
|
|
654
|
|
|
655 /* Added to libpng-1.2.6 JB */
|
|
|
656 #define PNG_ROWBYTES(pixel_bits, width) \
|
|
|
657 ((pixel_bits) >= 8 ? \
|
|
|
658 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \
|
|
|
659 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )
|
|
|
660
|
|
|
661 /* PNG_OUT_OF_RANGE returns true if value is outside the range
|
|
|
662 * ideal-delta..ideal+delta. Each argument is evaluated twice.
|
|
|
663 * "ideal" and "delta" should be constants, normally simple
|
|
|
664 * integers, "value" a variable. Added to libpng-1.2.6 JB
|
|
|
665 */
|
|
|
666 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
|
|
|
667 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
|
|
|
668
|
|
|
669 /* Conversions between fixed and floating point, only defined if
|
|
|
670 * required (to make sure the code doesn't accidentally use float
|
|
|
671 * when it is supposedly disabled.)
|
|
|
672 */
|
|
|
673 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
674 /* The floating point conversion can't overflow, though it can and
|
|
|
675 * does lose accuracy relative to the original fixed point value.
|
|
|
676 * In practice this doesn't matter because png_fixed_point only
|
|
|
677 * stores numbers with very low precision. The png_ptr and s
|
|
|
678 * arguments are unused by default but are there in case error
|
|
|
679 * checking becomes a requirement.
|
|
|
680 */
|
|
|
681 #define png_float(png_ptr, fixed, s) (.00001 * (fixed))
|
|
|
682
|
|
|
683 /* The fixed point conversion performs range checking and evaluates
|
|
|
684 * its argument multiple times, so must be used with care. The
|
|
|
685 * range checking uses the PNG specification values for a signed
|
|
|
686 * 32 bit fixed point value except that the values are deliberately
|
|
|
687 * rounded-to-zero to an integral value - 21474 (21474.83 is roughly
|
|
|
688 * (2^31-1) * 100000). 's' is a string that describes the value being
|
|
|
689 * converted.
|
|
|
690 *
|
|
|
691 * NOTE: this macro will raise a png_error if the range check fails,
|
|
|
692 * therefore it is normally only appropriate to use this on values
|
|
|
693 * that come from API calls or other sources where an out of range
|
|
|
694 * error indicates a programming error, not a data error!
|
|
|
695 *
|
|
|
696 * NOTE: by default this is off - the macro is not used - because the
|
|
|
697 * function call saves a lot of code.
|
|
|
698 */
|
|
|
699 #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED
|
|
|
700 #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\
|
|
|
701 ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))
|
|
|
702 #endif
|
|
|
703 /* else the corresponding function is defined below, inside the scope of the
|
|
|
704 * cplusplus test.
|
|
|
705 */
|
|
|
706 #endif
|
|
|
707
|
|
|
708 /* Constants for known chunk types. If you need to add a chunk, define the name
|
|
|
709 * here. For historical reasons these constants have the form png_<name>; i.e.
|
|
|
710 * the prefix is lower case. Please use decimal values as the parameters to
|
|
|
711 * match the ISO PNG specification and to avoid relying on the C locale
|
|
|
712 * interpretation of character values.
|
|
|
713 *
|
|
|
714 * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values
|
|
|
715 * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string
|
|
|
716 * to be generated if required.
|
|
|
717 *
|
|
|
718 * PNG_32b correctly produces a value shifted by up to 24 bits, even on
|
|
|
719 * architectures where (int) is only 16 bits.
|
|
|
720 */
|
|
|
721 #define PNG_32b(b,s) ((png_uint_32)(b) << (s))
|
|
|
722 #define PNG_U32(b1,b2,b3,b4) \
|
|
|
723 (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))
|
|
|
724
|
|
|
725 /* Constants for known chunk types.
|
|
|
726 *
|
|
|
727 * MAINTAINERS: If you need to add a chunk, define the name here.
|
|
|
728 * For historical reasons these constants have the form png_<name>; i.e.
|
|
|
729 * the prefix is lower case. Please use decimal values as the parameters to
|
|
|
730 * match the ISO PNG specification and to avoid relying on the C locale
|
|
|
731 * interpretation of character values. Please keep the list sorted.
|
|
|
732 *
|
|
|
733 * Notice that PNG_U32 is used to define a 32-bit value for the 4 byte chunk
|
|
|
734 * type. In fact the specification does not express chunk types this way,
|
|
|
735 * however using a 32-bit value means that the chunk type can be read from the
|
|
|
736 * stream using exactly the same code as used for a 32-bit unsigned value and
|
|
|
737 * can be examined far more efficiently (using one arithmetic compare).
|
|
|
738 *
|
|
|
739 * Prior to 1.5.6 the chunk type constants were expressed as C strings. The
|
|
|
740 * libpng API still uses strings for 'unknown' chunks and a macro,
|
|
|
741 * PNG_STRING_FROM_CHUNK, allows a string to be generated if required. Notice
|
|
|
742 * that for portable code numeric values must still be used; the string "IHDR"
|
|
|
743 * is not portable and neither is PNG_U32('I', 'H', 'D', 'R').
|
|
|
744 *
|
|
|
745 * In 1.7.0 the definitions will be made public in png.h to avoid having to
|
|
|
746 * duplicate the same definitions in application code.
|
|
|
747 */
|
|
|
748 #define png_IDAT PNG_U32( 73, 68, 65, 84)
|
|
|
749 #define png_IEND PNG_U32( 73, 69, 78, 68)
|
|
|
750 #define png_IHDR PNG_U32( 73, 72, 68, 82)
|
|
|
751 #define png_PLTE PNG_U32( 80, 76, 84, 69)
|
|
|
752 #define png_bKGD PNG_U32( 98, 75, 71, 68)
|
|
|
753 #define png_cHRM PNG_U32( 99, 72, 82, 77)
|
|
|
754 #define png_fRAc PNG_U32(102, 82, 65, 99) /* registered, not defined */
|
|
|
755 #define png_gAMA PNG_U32(103, 65, 77, 65)
|
|
|
756 #define png_gIFg PNG_U32(103, 73, 70, 103)
|
|
|
757 #define png_gIFt PNG_U32(103, 73, 70, 116) /* deprecated */
|
|
|
758 #define png_gIFx PNG_U32(103, 73, 70, 120)
|
|
|
759 #define png_hIST PNG_U32(104, 73, 83, 84)
|
|
|
760 #define png_iCCP PNG_U32(105, 67, 67, 80)
|
|
|
761 #define png_iTXt PNG_U32(105, 84, 88, 116)
|
|
|
762 #define png_oFFs PNG_U32(111, 70, 70, 115)
|
|
|
763 #define png_pCAL PNG_U32(112, 67, 65, 76)
|
|
|
764 #define png_pHYs PNG_U32(112, 72, 89, 115)
|
|
|
765 #define png_sBIT PNG_U32(115, 66, 73, 84)
|
|
|
766 #define png_sCAL PNG_U32(115, 67, 65, 76)
|
|
|
767 #define png_sPLT PNG_U32(115, 80, 76, 84)
|
|
|
768 #define png_sRGB PNG_U32(115, 82, 71, 66)
|
|
|
769 #define png_sTER PNG_U32(115, 84, 69, 82)
|
|
|
770 #define png_tEXt PNG_U32(116, 69, 88, 116)
|
|
|
771 #define png_tIME PNG_U32(116, 73, 77, 69)
|
|
|
772 #define png_tRNS PNG_U32(116, 82, 78, 83)
|
|
|
773 #define png_zTXt PNG_U32(122, 84, 88, 116)
|
|
|
774
|
|
|
775 /* The following will work on (signed char*) strings, whereas the get_uint_32
|
|
|
776 * macro will fail on top-bit-set values because of the sign extension.
|
|
|
777 */
|
|
|
778 #define PNG_CHUNK_FROM_STRING(s)\
|
|
|
779 PNG_U32(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])
|
|
|
780
|
|
|
781 /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is
|
|
|
782 * signed and the argument is a (char[]) This macro will fail miserably on
|
|
|
783 * systems where (char) is more than 8 bits.
|
|
|
784 */
|
|
|
785 #define PNG_STRING_FROM_CHUNK(s,c)\
|
|
|
786 (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\
|
|
|
787 ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))
|
|
|
788
|
|
|
789 /* Do the same but terminate with a null character. */
|
|
|
790 #define PNG_CSTRING_FROM_CHUNK(s,c)\
|
|
|
791 (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)
|
|
|
792
|
|
|
793 /* Test on flag values as defined in the spec (section 5.4): */
|
|
|
794 #define PNG_CHUNK_ANCILLARY(c) (1 & ((c) >> 29))
|
|
|
795 #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLARY(c))
|
|
|
796 #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))
|
|
|
797 #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))
|
|
|
798 #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))
|
|
|
799
|
|
|
800 /* Gamma values (new at libpng-1.5.4): */
|
|
|
801 #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */
|
|
|
802 #define PNG_GAMMA_MAC_INVERSE 65909
|
|
|
803 #define PNG_GAMMA_sRGB_INVERSE 45455
|
|
|
804
|
|
|
805 /* Almost everything below is C specific; the #defines above can be used in
|
|
|
806 * non-C code (so long as it is C-preprocessed) the rest of this stuff cannot.
|
|
|
807 */
|
|
|
808 #ifndef PNG_VERSION_INFO_ONLY
|
|
|
809
|
|
|
810 #include "pngstruct.h"
|
|
|
811 #include "pnginfo.h"
|
|
|
812
|
|
|
813 /* Validate the include paths - the include path used to generate pnglibconf.h
|
|
|
814 * must match that used in the build, or we must be using pnglibconf.h.prebuilt:
|
|
|
815 */
|
|
|
816 #if PNG_ZLIB_VERNUM != 0 && PNG_ZLIB_VERNUM != ZLIB_VERNUM
|
|
|
817 # error ZLIB_VERNUM != PNG_ZLIB_VERNUM \
|
|
|
818 "-I (include path) error: see the notes in pngpriv.h"
|
|
|
819 /* This means that when pnglibconf.h was built the copy of zlib.h that it
|
|
|
820 * used is not the same as the one being used here. Because the build of
|
|
|
821 * libpng makes decisions to use inflateInit2 and inflateReset2 based on the
|
|
|
822 * zlib version number and because this affects handling of certain broken
|
|
|
823 * PNG files the -I directives must match.
|
|
|
824 *
|
|
|
825 * The most likely explanation is that you passed a -I in CFLAGS, this will
|
|
|
826 * not work; all the preprocessor directories and in particular all the -I
|
|
|
827 * directives must be in CPPFLAGS.
|
|
|
828 */
|
|
|
829 #endif
|
|
|
830
|
|
|
831 /* This is used for 16 bit gamma tables -- only the top level pointers are
|
|
|
832 * const; this could be changed:
|
|
|
833 */
|
|
|
834 typedef const png_uint_16p * png_const_uint_16pp;
|
|
|
835
|
|
|
836 /* Added to libpng-1.5.7: sRGB conversion tables */
|
|
|
837 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
|
|
|
838 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
|
|
|
839 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED
|
|
|
840 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]);
|
|
|
841 /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value,
|
|
|
842 * 0..65535. This table gives the closest 16-bit answers (no errors).
|
|
|
843 */
|
|
|
844 #endif
|
|
|
845
|
|
|
846 PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]);
|
|
|
847 PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]);
|
|
|
848
|
|
|
849 #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\
|
|
|
850 ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8))
|
|
|
851 /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB
|
|
|
852 * encoded value with maximum error 0.646365. Note that the input is not a
|
|
|
853 * 16-bit value; it has been multiplied by 255! */
|
|
|
854 #endif /* PNG_SIMPLIFIED_READ/WRITE */
|
|
|
855
|
|
|
856
|
|
|
857 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
|
858 #ifdef __cplusplus
|
|
|
859 extern "C" {
|
|
|
860 #endif /* __cplusplus */
|
|
|
861
|
|
|
862 /* Internal functions; these are not exported from a DLL however because they
|
|
|
863 * are used within several of the C source files they have to be C extern.
|
|
|
864 *
|
|
|
865 * All of these functions must be declared with PNG_INTERNAL_FUNCTION.
|
|
|
866 */
|
|
|
867
|
|
|
868 /* Zlib support */
|
|
|
869 #define PNG_UNEXPECTED_ZLIB_RETURN (-7)
|
|
|
870 PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret),
|
|
|
871 PNG_EMPTY);
|
|
|
872 /* Used by the zlib handling functions to ensure that z_stream::msg is always
|
|
|
873 * set before they return.
|
|
|
874 */
|
|
|
875
|
|
|
876 #ifdef PNG_WRITE_SUPPORTED
|
|
|
877 PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr,
|
|
|
878 png_compression_bufferp *list),PNG_EMPTY);
|
|
|
879 /* Free the buffer list used by the compressed write code. */
|
|
|
880 #endif
|
|
|
881
|
|
|
882 #if defined(PNG_FLOATING_POINT_SUPPORTED) && \
|
|
|
883 !defined(PNG_FIXED_POINT_MACRO_SUPPORTED) && \
|
|
|
884 (defined(PNG_gAMA_SUPPORTED) || defined(PNG_cHRM_SUPPORTED) || \
|
|
|
885 defined(PNG_sCAL_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|
|
886 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)) || \
|
|
|
887 (defined(PNG_sCAL_SUPPORTED) && \
|
|
|
888 defined(PNG_FLOATING_ARITHMETIC_SUPPORTED))
|
|
|
889 PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr,
|
|
|
890 double fp, png_const_charp text),PNG_EMPTY);
|
|
|
891 #endif
|
|
|
892
|
|
|
893 /* Check the user version string for compatibility, returns false if the version
|
|
|
894 * numbers aren't compatible.
|
|
|
895 */
|
|
|
896 PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr,
|
|
|
897 png_const_charp user_png_ver),PNG_EMPTY);
|
|
|
898
|
|
|
899 /* Internal base allocator - no messages, NULL on failure to allocate. This
|
|
|
900 * does, however, call the application provided allocator and that could call
|
|
|
901 * png_error (although that would be a bug in the application implementation.)
|
|
|
902 */
|
|
|
903 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr,
|
|
|
904 png_alloc_size_t size),PNG_ALLOCATED);
|
|
|
905
|
|
|
906 #if defined(PNG_TEXT_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) ||\
|
|
|
907 defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
908 /* Internal array allocator, outputs no error or warning messages on failure,
|
|
|
909 * just returns NULL.
|
|
|
910 */
|
|
|
911 PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_array,(png_const_structrp png_ptr,
|
|
|
912 int nelements, size_t element_size),PNG_ALLOCATED);
|
|
|
913
|
|
|
914 /* The same but an existing array is extended by add_elements. This function
|
|
|
915 * also memsets the new elements to 0 and copies the old elements. The old
|
|
|
916 * array is not freed or altered.
|
|
|
917 */
|
|
|
918 PNG_INTERNAL_FUNCTION(png_voidp,png_realloc_array,(png_const_structrp png_ptr,
|
|
|
919 png_const_voidp array, int old_elements, int add_elements,
|
|
|
920 size_t element_size),PNG_ALLOCATED);
|
|
|
921 #endif /* text, sPLT or unknown chunks */
|
|
|
922
|
|
|
923 /* Magic to create a struct when there is no struct to call the user supplied
|
|
|
924 * memory allocators. Because error handling has not been set up the memory
|
|
|
925 * handlers can't safely call png_error, but this is an obscure and undocumented
|
|
|
926 * restriction so libpng has to assume that the 'free' handler, at least, might
|
|
|
927 * call png_error.
|
|
|
928 */
|
|
|
929 PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct,
|
|
|
930 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
|
931 png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
|
|
|
932 png_free_ptr free_fn),PNG_ALLOCATED);
|
|
|
933
|
|
|
934 /* Free memory from internal libpng struct */
|
|
|
935 PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr),
|
|
|
936 PNG_EMPTY);
|
|
|
937
|
|
|
938 /* Free an allocated jmp_buf (always succeeds) */
|
|
|
939 PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
940
|
|
|
941 /* Function to allocate memory for zlib. PNGAPI is disallowed. */
|
|
|
942 PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size),
|
|
|
943 PNG_ALLOCATED);
|
|
|
944
|
|
|
945 /* Function to free memory for zlib. PNGAPI is disallowed. */
|
|
|
946 PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY);
|
|
|
947
|
|
|
948 /* Next four functions are used internally as callbacks. PNGCBAPI is required
|
|
|
949 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to
|
|
|
950 * PNGCBAPI at 1.5.0
|
|
|
951 */
|
|
|
952
|
|
|
953 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr,
|
|
|
954 png_bytep data, png_size_t length),PNG_EMPTY);
|
|
|
955
|
|
|
956 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
957 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr,
|
|
|
958 png_bytep buffer, png_size_t length),PNG_EMPTY);
|
|
|
959 #endif
|
|
|
960
|
|
|
961 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr,
|
|
|
962 png_bytep data, png_size_t length),PNG_EMPTY);
|
|
|
963
|
|
|
964 #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
|
965 # ifdef PNG_STDIO_SUPPORTED
|
|
|
966 PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr),
|
|
|
967 PNG_EMPTY);
|
|
|
968 # endif
|
|
|
969 #endif
|
|
|
970
|
|
|
971 /* Reset the CRC variable */
|
|
|
972 PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
973
|
|
|
974 /* Write the "data" buffer to whatever output you are using */
|
|
|
975 PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr,
|
|
|
976 png_const_bytep data, png_size_t length),PNG_EMPTY);
|
|
|
977
|
|
|
978 /* Read and check the PNG file signature */
|
|
|
979 PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr,
|
|
|
980 png_inforp info_ptr),PNG_EMPTY);
|
|
|
981
|
|
|
982 /* Read the chunk header (length + type name) */
|
|
|
983 PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr),
|
|
|
984 PNG_EMPTY);
|
|
|
985
|
|
|
986 /* Read data from whatever input you are using into the "data" buffer */
|
|
|
987 PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data,
|
|
|
988 png_size_t length),PNG_EMPTY);
|
|
|
989
|
|
|
990 /* Read bytes into buf, and update png_ptr->crc */
|
|
|
991 PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf,
|
|
|
992 png_uint_32 length),PNG_EMPTY);
|
|
|
993
|
|
|
994 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
|
|
|
995 PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr,
|
|
|
996 png_uint_32 skip),PNG_EMPTY);
|
|
|
997
|
|
|
998 /* Read the CRC from the file and compare it to the libpng calculated CRC */
|
|
|
999 PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1000
|
|
|
1001 /* Calculate the CRC over a section of data. Note that we are only
|
|
|
1002 * passing a maximum of 64K on systems that have this as a memory limit,
|
|
|
1003 * since this is the maximum buffer size we can specify.
|
|
|
1004 */
|
|
|
1005 PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr,
|
|
|
1006 png_const_bytep ptr, png_size_t length),PNG_EMPTY);
|
|
|
1007
|
|
|
1008 #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
|
1009 PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1010 #endif
|
|
|
1011
|
|
|
1012 /* Write various chunks */
|
|
|
1013
|
|
|
1014 /* Write the IHDR chunk, and update the png_struct with the necessary
|
|
|
1015 * information.
|
|
|
1016 */
|
|
|
1017 PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr,
|
|
|
1018 png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
|
|
|
1019 int compression_method, int filter_method, int interlace_method),PNG_EMPTY);
|
|
|
1020
|
|
|
1021 PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr,
|
|
|
1022 png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY);
|
|
|
1023
|
|
|
1024 PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr,
|
|
|
1025 png_const_bytep row_data, png_alloc_size_t row_data_length, int flush),
|
|
|
1026 PNG_EMPTY);
|
|
|
1027
|
|
|
1028 PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1029
|
|
|
1030 #ifdef PNG_WRITE_gAMA_SUPPORTED
|
|
|
1031 PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr,
|
|
|
1032 png_fixed_point file_gamma),PNG_EMPTY);
|
|
|
1033 #endif
|
|
|
1034
|
|
|
1035 #ifdef PNG_WRITE_sBIT_SUPPORTED
|
|
|
1036 PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr,
|
|
|
1037 png_const_color_8p sbit, int color_type),PNG_EMPTY);
|
|
|
1038 #endif
|
|
|
1039
|
|
|
1040 #ifdef PNG_WRITE_cHRM_SUPPORTED
|
|
|
1041 PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr,
|
|
|
1042 const png_xy *xy), PNG_EMPTY);
|
|
|
1043 /* The xy value must have been previously validated */
|
|
|
1044 #endif
|
|
|
1045
|
|
|
1046 #ifdef PNG_WRITE_sRGB_SUPPORTED
|
|
|
1047 PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr,
|
|
|
1048 int intent),PNG_EMPTY);
|
|
|
1049 #endif
|
|
|
1050
|
|
|
1051 #ifdef PNG_WRITE_iCCP_SUPPORTED
|
|
|
1052 PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr,
|
|
|
1053 png_const_charp name, png_const_bytep profile), PNG_EMPTY);
|
|
|
1054 /* The profile must have been previously validated for correctness, the
|
|
|
1055 * length comes from the first four bytes. Only the base, deflate,
|
|
|
1056 * compression is supported.
|
|
|
1057 */
|
|
|
1058 #endif
|
|
|
1059
|
|
|
1060 #ifdef PNG_WRITE_sPLT_SUPPORTED
|
|
|
1061 PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr,
|
|
|
1062 png_const_sPLT_tp palette),PNG_EMPTY);
|
|
|
1063 #endif
|
|
|
1064
|
|
|
1065 #ifdef PNG_WRITE_tRNS_SUPPORTED
|
|
|
1066 PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr,
|
|
|
1067 png_const_bytep trans, png_const_color_16p values, int number,
|
|
|
1068 int color_type),PNG_EMPTY);
|
|
|
1069 #endif
|
|
|
1070
|
|
|
1071 #ifdef PNG_WRITE_bKGD_SUPPORTED
|
|
|
1072 PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr,
|
|
|
1073 png_const_color_16p values, int color_type),PNG_EMPTY);
|
|
|
1074 #endif
|
|
|
1075
|
|
|
1076 #ifdef PNG_WRITE_hIST_SUPPORTED
|
|
|
1077 PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr,
|
|
|
1078 png_const_uint_16p hist, int num_hist),PNG_EMPTY);
|
|
|
1079 #endif
|
|
|
1080
|
|
|
1081 /* Chunks that have keywords */
|
|
|
1082 #ifdef PNG_WRITE_tEXt_SUPPORTED
|
|
|
1083 PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr,
|
|
|
1084 png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY);
|
|
|
1085 #endif
|
|
|
1086
|
|
|
1087 #ifdef PNG_WRITE_zTXt_SUPPORTED
|
|
|
1088 PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp
|
|
|
1089 key, png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY);
|
|
|
1090 #endif
|
|
|
1091
|
|
|
1092 #ifdef PNG_WRITE_iTXt_SUPPORTED
|
|
|
1093 PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr,
|
|
|
1094 int compression, png_const_charp key, png_const_charp lang,
|
|
|
1095 png_const_charp lang_key, png_const_charp text),PNG_EMPTY);
|
|
|
1096 #endif
|
|
|
1097
|
|
|
1098 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
|
|
|
1099 PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr,
|
|
|
1100 png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY);
|
|
|
1101 #endif
|
|
|
1102
|
|
|
1103 #ifdef PNG_WRITE_oFFs_SUPPORTED
|
|
|
1104 PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr,
|
|
|
1105 png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY);
|
|
|
1106 #endif
|
|
|
1107
|
|
|
1108 #ifdef PNG_WRITE_pCAL_SUPPORTED
|
|
|
1109 PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr,
|
|
|
1110 png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
|
|
|
1111 png_const_charp units, png_charpp params),PNG_EMPTY);
|
|
|
1112 #endif
|
|
|
1113
|
|
|
1114 #ifdef PNG_WRITE_pHYs_SUPPORTED
|
|
|
1115 PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr,
|
|
|
1116 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
|
|
|
1117 int unit_type),PNG_EMPTY);
|
|
|
1118 #endif
|
|
|
1119
|
|
|
1120 #ifdef PNG_WRITE_tIME_SUPPORTED
|
|
|
1121 PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr,
|
|
|
1122 png_const_timep mod_time),PNG_EMPTY);
|
|
|
1123 #endif
|
|
|
1124
|
|
|
1125 #ifdef PNG_WRITE_sCAL_SUPPORTED
|
|
|
1126 PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr,
|
|
|
1127 int unit, png_const_charp width, png_const_charp height),PNG_EMPTY);
|
|
|
1128 #endif
|
|
|
1129
|
|
|
1130 /* Called when finished processing a row of data */
|
|
|
1131 PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),
|
|
|
1132 PNG_EMPTY);
|
|
|
1133
|
|
|
1134 /* Internal use only. Called before first row of data */
|
|
|
1135 PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),
|
|
|
1136 PNG_EMPTY);
|
|
|
1137
|
|
|
1138 /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an
|
|
|
1139 * array of png_ptr->width pixels. If the image is not interlaced or this
|
|
|
1140 * is the final pass this just does a memcpy, otherwise the "display" flag
|
|
|
1141 * is used to determine whether to copy pixels that are not in the current pass.
|
|
|
1142 *
|
|
|
1143 * Because 'png_do_read_interlace' (below) replicates pixels this allows this
|
|
|
1144 * function to achieve the documented 'blocky' appearance during interlaced read
|
|
|
1145 * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'
|
|
|
1146 * are not changed if they are not in the current pass, when display is 0.
|
|
|
1147 *
|
|
|
1148 * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.
|
|
|
1149 *
|
|
|
1150 * The API always reads from the png_struct row buffer and always assumes that
|
|
|
1151 * it is full width (png_do_read_interlace has already been called.)
|
|
|
1152 *
|
|
|
1153 * This function is only ever used to write to row buffers provided by the
|
|
|
1154 * caller of the relevant libpng API and the row must have already been
|
|
|
1155 * transformed by the read transformations.
|
|
|
1156 *
|
|
|
1157 * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed
|
|
|
1158 * bitmasks for use within the code, otherwise runtime generated masks are used.
|
|
|
1159 * The default is compile time masks.
|
|
|
1160 */
|
|
|
1161 #ifndef PNG_USE_COMPILE_TIME_MASKS
|
|
|
1162 # define PNG_USE_COMPILE_TIME_MASKS 1
|
|
|
1163 #endif
|
|
|
1164 PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr,
|
|
|
1165 png_bytep row, int display),PNG_EMPTY);
|
|
|
1166
|
|
|
1167 #ifdef PNG_READ_INTERLACING_SUPPORTED
|
|
|
1168 /* Expand an interlaced row: the 'row_info' describes the pass data that has
|
|
|
1169 * been read in and must correspond to the pixels in 'row', the pixels are
|
|
|
1170 * expanded (moved apart) in 'row' to match the final layout, when doing this
|
|
|
1171 * the pixels are *replicated* to the intervening space. This is essential for
|
|
|
1172 * the correct operation of png_combine_row, above.
|
|
|
1173 */
|
|
|
1174 PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info,
|
|
|
1175 png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY);
|
|
|
1176 #endif
|
|
|
1177
|
|
|
1178 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
|
|
|
1179
|
|
|
1180 #ifdef PNG_WRITE_INTERLACING_SUPPORTED
|
|
|
1181 /* Grab pixels out of a row for an interlaced pass */
|
|
|
1182 PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info,
|
|
|
1183 png_bytep row, int pass),PNG_EMPTY);
|
|
|
1184 #endif
|
|
|
1185
|
|
|
1186 /* Unfilter a row: check the filter value before calling this, there is no point
|
|
|
1187 * calling it for PNG_FILTER_VALUE_NONE.
|
|
|
1188 */
|
|
|
1189 PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop
|
|
|
1190 row_info, png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY);
|
|
|
1191
|
|
|
1192 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info,
|
|
|
1193 png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1194 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop
|
|
|
1195 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1196 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop
|
|
|
1197 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1198 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop
|
|
|
1199 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1200 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop
|
|
|
1201 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1202 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop
|
|
|
1203 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1204 PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop
|
|
|
1205 row_info, png_bytep row, png_const_bytep prev_row),PNG_EMPTY);
|
|
|
1206
|
|
|
1207 /* Choose the best filter to use and filter the row data */
|
|
|
1208 PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr,
|
|
|
1209 png_row_infop row_info),PNG_EMPTY);
|
|
|
1210
|
|
|
1211 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1212 PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr,
|
|
|
1213 png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY);
|
|
|
1214 /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer
|
|
|
1215 * is NULL the function checks, instead, for the end of the stream. In this
|
|
|
1216 * case a benign error will be issued if the stream end is not found or if
|
|
|
1217 * extra data has to be consumed.
|
|
|
1218 */
|
|
|
1219 PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr),
|
|
|
1220 PNG_EMPTY);
|
|
|
1221 /* This cleans up when the IDAT LZ stream does not end when the last image
|
|
|
1222 * byte is read; there is still some pending input.
|
|
|
1223 */
|
|
|
1224
|
|
|
1225 PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr),
|
|
|
1226 PNG_EMPTY);
|
|
|
1227 /* Finish a row while reading, dealing with interlacing passes, etc. */
|
|
|
1228 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */
|
|
|
1229
|
|
|
1230 /* Initialize the row buffers, etc. */
|
|
|
1231 PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1232
|
|
|
1233 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
|
|
|
1234 /* Optional call to update the users info structure */
|
|
|
1235 PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr,
|
|
|
1236 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1237 #endif
|
|
|
1238
|
|
|
1239 /* Shared transform functions, defined in pngtran.c */
|
|
|
1240 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
|
|
1241 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
|
1242 PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info,
|
|
|
1243 png_bytep row, int at_start),PNG_EMPTY);
|
|
|
1244 #endif
|
|
|
1245
|
|
|
1246 #ifdef PNG_16BIT_SUPPORTED
|
|
|
1247 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
|
1248 PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info,
|
|
|
1249 png_bytep row),PNG_EMPTY);
|
|
|
1250 #endif
|
|
|
1251 #endif
|
|
|
1252
|
|
|
1253 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
|
|
|
1254 defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
|
1255 PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info,
|
|
|
1256 png_bytep row),PNG_EMPTY);
|
|
|
1257 #endif
|
|
|
1258
|
|
|
1259 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
|
1260 PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info,
|
|
|
1261 png_bytep row),PNG_EMPTY);
|
|
|
1262 #endif
|
|
|
1263
|
|
|
1264 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
|
1265 PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info,
|
|
|
1266 png_bytep row),PNG_EMPTY);
|
|
|
1267 #endif
|
|
|
1268
|
|
|
1269 /* The following decodes the appropriate chunks, and does error correction,
|
|
|
1270 * then calls the appropriate callback for the chunk if it is valid.
|
|
|
1271 */
|
|
|
1272
|
|
|
1273 /* Decode the IHDR chunk */
|
|
|
1274 PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr,
|
|
|
1275 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1276 PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr,
|
|
|
1277 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1278 PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr,
|
|
|
1279 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1280
|
|
|
1281 #ifdef PNG_READ_bKGD_SUPPORTED
|
|
|
1282 PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr,
|
|
|
1283 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1284 #endif
|
|
|
1285
|
|
|
1286 #ifdef PNG_READ_cHRM_SUPPORTED
|
|
|
1287 PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr,
|
|
|
1288 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1289 #endif
|
|
|
1290
|
|
|
1291 #ifdef PNG_READ_gAMA_SUPPORTED
|
|
|
1292 PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr,
|
|
|
1293 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1294 #endif
|
|
|
1295
|
|
|
1296 #ifdef PNG_READ_hIST_SUPPORTED
|
|
|
1297 PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr,
|
|
|
1298 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1299 #endif
|
|
|
1300
|
|
|
1301 #ifdef PNG_READ_iCCP_SUPPORTED
|
|
|
1302 PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr,
|
|
|
1303 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1304 #endif /* PNG_READ_iCCP_SUPPORTED */
|
|
|
1305
|
|
|
1306 #ifdef PNG_READ_iTXt_SUPPORTED
|
|
|
1307 PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr,
|
|
|
1308 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1309 #endif
|
|
|
1310
|
|
|
1311 #ifdef PNG_READ_oFFs_SUPPORTED
|
|
|
1312 PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr,
|
|
|
1313 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1314 #endif
|
|
|
1315
|
|
|
1316 #ifdef PNG_READ_pCAL_SUPPORTED
|
|
|
1317 PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr,
|
|
|
1318 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1319 #endif
|
|
|
1320
|
|
|
1321 #ifdef PNG_READ_pHYs_SUPPORTED
|
|
|
1322 PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr,
|
|
|
1323 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1324 #endif
|
|
|
1325
|
|
|
1326 #ifdef PNG_READ_sBIT_SUPPORTED
|
|
|
1327 PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr,
|
|
|
1328 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1329 #endif
|
|
|
1330
|
|
|
1331 #ifdef PNG_READ_sCAL_SUPPORTED
|
|
|
1332 PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr,
|
|
|
1333 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1334 #endif
|
|
|
1335
|
|
|
1336 #ifdef PNG_READ_sPLT_SUPPORTED
|
|
|
1337 PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr,
|
|
|
1338 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1339 #endif /* PNG_READ_sPLT_SUPPORTED */
|
|
|
1340
|
|
|
1341 #ifdef PNG_READ_sRGB_SUPPORTED
|
|
|
1342 PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr,
|
|
|
1343 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1344 #endif
|
|
|
1345
|
|
|
1346 #ifdef PNG_READ_tEXt_SUPPORTED
|
|
|
1347 PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr,
|
|
|
1348 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1349 #endif
|
|
|
1350
|
|
|
1351 #ifdef PNG_READ_tIME_SUPPORTED
|
|
|
1352 PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr,
|
|
|
1353 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1354 #endif
|
|
|
1355
|
|
|
1356 #ifdef PNG_READ_tRNS_SUPPORTED
|
|
|
1357 PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr,
|
|
|
1358 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1359 #endif
|
|
|
1360
|
|
|
1361 #ifdef PNG_READ_zTXt_SUPPORTED
|
|
|
1362 PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr,
|
|
|
1363 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1364 #endif
|
|
|
1365
|
|
|
1366 PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr,
|
|
|
1367 png_uint_32 chunk_name),PNG_EMPTY);
|
|
|
1368
|
|
|
1369 PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr,
|
|
|
1370 png_inforp info_ptr, png_uint_32 length, int keep),PNG_EMPTY);
|
|
|
1371 /* This is the function that gets called for unknown chunks. The 'keep'
|
|
|
1372 * argument is either non-zero for a known chunk that has been set to be
|
|
|
1373 * handled as unknown or zero for an unknown chunk. By default the function
|
|
|
1374 * just skips the chunk or errors out if it is critical.
|
|
|
1375 */
|
|
|
1376
|
|
|
1377 #if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED) ||\
|
|
|
1378 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|
|
1379 PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,
|
|
|
1380 (png_const_structrp png_ptr, png_uint_32 chunk_name),PNG_EMPTY);
|
|
|
1381 /* Exactly as the API png_handle_as_unknown() except that the argument is a
|
|
|
1382 * 32-bit chunk name, not a string.
|
|
|
1383 */
|
|
|
1384 #endif /* READ_UNKNOWN_CHUNKS || HANDLE_AS_UNKNOWN */
|
|
|
1385
|
|
|
1386 /* Handle the transformations for reading and writing */
|
|
|
1387 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
|
|
|
1388 PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr,
|
|
|
1389 png_row_infop row_info),PNG_EMPTY);
|
|
|
1390 #endif
|
|
|
1391 #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
|
|
|
1392 PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr,
|
|
|
1393 png_row_infop row_info),PNG_EMPTY);
|
|
|
1394 #endif
|
|
|
1395
|
|
|
1396 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
|
|
|
1397 PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),
|
|
|
1398 PNG_EMPTY);
|
|
|
1399 #endif
|
|
|
1400
|
|
|
1401 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
1402 PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr,
|
|
|
1403 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1404 PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr,
|
|
|
1405 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1406 PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1407 PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr,
|
|
|
1408 png_uint_32 length),PNG_EMPTY);
|
|
|
1409 PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),
|
|
|
1410 PNG_EMPTY);
|
|
|
1411 PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),
|
|
|
1412 PNG_EMPTY);
|
|
|
1413 PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr,
|
|
|
1414 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
|
|
|
1415 PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY);
|
|
|
1416 PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr,
|
|
|
1417 png_bytep buffer, png_size_t buffer_length),PNG_EMPTY);
|
|
|
1418 PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),
|
|
|
1419 PNG_EMPTY);
|
|
|
1420 PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr,
|
|
|
1421 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1422 PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr,
|
|
|
1423 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1424 PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr,
|
|
|
1425 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1426 PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr,
|
|
|
1427 png_bytep row),PNG_EMPTY);
|
|
|
1428 PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr,
|
|
|
1429 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1430 PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr,
|
|
|
1431 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1432 PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),
|
|
|
1433 PNG_EMPTY);
|
|
|
1434 # ifdef PNG_READ_tEXt_SUPPORTED
|
|
|
1435 PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr,
|
|
|
1436 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1437 PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr,
|
|
|
1438 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1439 # endif
|
|
|
1440 # ifdef PNG_READ_zTXt_SUPPORTED
|
|
|
1441 PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr,
|
|
|
1442 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1443 PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr,
|
|
|
1444 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1445 # endif
|
|
|
1446 # ifdef PNG_READ_iTXt_SUPPORTED
|
|
|
1447 PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr,
|
|
|
1448 png_inforp info_ptr, png_uint_32 length),PNG_EMPTY);
|
|
|
1449 PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr,
|
|
|
1450 png_inforp info_ptr),PNG_EMPTY);
|
|
|
1451 # endif
|
|
|
1452
|
|
|
1453 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
1454
|
|
|
1455 /* Added at libpng version 1.6.0 */
|
|
|
1456 #ifdef PNG_GAMMA_SUPPORTED
|
|
|
1457 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_gamma,(png_const_structrp png_ptr,
|
|
|
1458 png_colorspacerp colorspace, png_fixed_point gAMA), PNG_EMPTY);
|
|
|
1459 /* Set the colorspace gamma with a value provided by the application or by
|
|
|
1460 * the gAMA chunk on read. The value will override anything set by an ICC
|
|
|
1461 * profile.
|
|
|
1462 */
|
|
|
1463
|
|
|
1464 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr,
|
|
|
1465 png_inforp info_ptr), PNG_EMPTY);
|
|
|
1466 /* Synchronize the info 'valid' flags with the colorspace */
|
|
|
1467
|
|
|
1468 PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr,
|
|
|
1469 png_inforp info_ptr), PNG_EMPTY);
|
|
|
1470 /* Copy the png_struct colorspace to the info_struct and call the above to
|
|
|
1471 * synchronize the flags. Checks for NULL info_ptr and does nothing.
|
|
|
1472 */
|
|
|
1473 #endif
|
|
|
1474
|
|
|
1475 /* Added at libpng version 1.4.0 */
|
|
|
1476 #ifdef PNG_COLORSPACE_SUPPORTED
|
|
|
1477 /* These internal functions are for maintaining the colorspace structure within
|
|
|
1478 * a png_info or png_struct (or, indeed, both).
|
|
|
1479 */
|
|
|
1480 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities,
|
|
|
1481 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy,
|
|
|
1482 int preferred), PNG_EMPTY);
|
|
|
1483
|
|
|
1484 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints,
|
|
|
1485 (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ,
|
|
|
1486 int preferred), PNG_EMPTY);
|
|
|
1487
|
|
|
1488 #ifdef PNG_sRGB_SUPPORTED
|
|
|
1489 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr,
|
|
|
1490 png_colorspacerp colorspace, int intent), PNG_EMPTY);
|
|
|
1491 /* This does set the colorspace gAMA and cHRM values too, but doesn't set the
|
|
|
1492 * flags to write them, if it returns false there was a problem and an error
|
|
|
1493 * message has already been output (but the colorspace may still need to be
|
|
|
1494 * synced to record the invalid flag).
|
|
|
1495 */
|
|
|
1496 #endif /* sRGB */
|
|
|
1497
|
|
|
1498 #ifdef PNG_iCCP_SUPPORTED
|
|
|
1499 PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr,
|
|
|
1500 png_colorspacerp colorspace, png_const_charp name,
|
|
|
1501 png_uint_32 profile_length, png_const_bytep profile, int color_type),
|
|
|
1502 PNG_EMPTY);
|
|
|
1503 /* The 'name' is used for information only */
|
|
|
1504
|
|
|
1505 /* Routines for checking parts of an ICC profile. */
|
|
|
1506 PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr,
|
|
|
1507 png_colorspacerp colorspace, png_const_charp name,
|
|
|
1508 png_uint_32 profile_length), PNG_EMPTY);
|
|
|
1509 PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr,
|
|
|
1510 png_colorspacerp colorspace, png_const_charp name,
|
|
|
1511 png_uint_32 profile_length,
|
|
|
1512 png_const_bytep profile /* first 132 bytes only */, int color_type),
|
|
|
1513 PNG_EMPTY);
|
|
|
1514 PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr,
|
|
|
1515 png_colorspacerp colorspace, png_const_charp name,
|
|
|
1516 png_uint_32 profile_length,
|
|
|
1517 png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY);
|
|
|
1518 #ifdef PNG_sRGB_SUPPORTED
|
|
|
1519 PNG_INTERNAL_FUNCTION(void,png_icc_set_sRGB,(
|
|
|
1520 png_const_structrp png_ptr, png_colorspacerp colorspace,
|
|
|
1521 png_const_bytep profile, uLong adler), PNG_EMPTY);
|
|
|
1522 /* 'adler' is the Adler32 checksum of the uncompressed profile data. It may
|
|
|
1523 * be zero to indicate that it is not available. It is used, if provided,
|
|
|
1524 * as a fast check on the profile when checking to see if it is sRGB.
|
|
|
1525 */
|
|
|
1526 #endif
|
|
|
1527 #endif /* iCCP */
|
|
|
1528
|
|
|
1529 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
|
1530 PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients,
|
|
|
1531 (png_structrp png_ptr), PNG_EMPTY);
|
|
|
1532 /* Set the rgb_to_gray coefficients from the colorspace Y values */
|
|
|
1533 #endif /* READ_RGB_TO_GRAY */
|
|
|
1534 #endif /* COLORSPACE */
|
|
|
1535
|
|
|
1536 /* Added at libpng version 1.4.0 */
|
|
|
1537 PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr,
|
|
|
1538 png_uint_32 width, png_uint_32 height, int bit_depth,
|
|
|
1539 int color_type, int interlace_type, int compression_type,
|
|
|
1540 int filter_type),PNG_EMPTY);
|
|
|
1541
|
|
|
1542 /* Added at libpng version 1.5.10 */
|
|
|
1543 #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
|
|
|
1544 defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
|
|
|
1545 PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes,
|
|
|
1546 (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY);
|
|
|
1547 #endif
|
|
|
1548
|
|
|
1549 #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)
|
|
|
1550 PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr,
|
|
|
1551 png_const_charp name),PNG_NORETURN);
|
|
|
1552 #endif
|
|
|
1553
|
|
|
1554 /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite
|
|
|
1555 * the end. Always leaves the buffer nul terminated. Never errors out (and
|
|
|
1556 * there is no error code.)
|
|
|
1557 */
|
|
|
1558 PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize,
|
|
|
1559 size_t pos, png_const_charp string),PNG_EMPTY);
|
|
|
1560
|
|
|
1561 /* Various internal functions to handle formatted warning messages, currently
|
|
|
1562 * only implemented for warnings.
|
|
|
1563 */
|
|
|
1564 #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
|
1565 /* Utility to dump an unsigned value into a buffer, given a start pointer and
|
|
|
1566 * and end pointer (which should point just *beyond* the end of the buffer!)
|
|
|
1567 * Returns the pointer to the start of the formatted string. This utility only
|
|
|
1568 * does unsigned values.
|
|
|
1569 */
|
|
|
1570 PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start,
|
|
|
1571 png_charp end, int format, png_alloc_size_t number),PNG_EMPTY);
|
|
|
1572
|
|
|
1573 /* Convenience macro that takes an array: */
|
|
|
1574 #define PNG_FORMAT_NUMBER(buffer,format,number) \
|
|
|
1575 png_format_number(buffer, buffer + (sizeof buffer), format, number)
|
|
|
1576
|
|
|
1577 /* Suggested size for a number buffer (enough for 64 bits and a sign!) */
|
|
|
1578 #define PNG_NUMBER_BUFFER_SIZE 24
|
|
|
1579
|
|
|
1580 /* These are the integer formats currently supported, the name is formed from
|
|
|
1581 * the standard printf(3) format string.
|
|
|
1582 */
|
|
|
1583 #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */
|
|
|
1584 #define PNG_NUMBER_FORMAT_02u 2
|
|
|
1585 #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */
|
|
|
1586 #define PNG_NUMBER_FORMAT_02d 2
|
|
|
1587 #define PNG_NUMBER_FORMAT_x 3
|
|
|
1588 #define PNG_NUMBER_FORMAT_02x 4
|
|
|
1589 #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */
|
|
|
1590 #endif
|
|
|
1591
|
|
|
1592 #ifdef PNG_WARNINGS_SUPPORTED
|
|
|
1593 /* New defines and members adding in libpng-1.5.4 */
|
|
|
1594 # define PNG_WARNING_PARAMETER_SIZE 32
|
|
|
1595 # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */
|
|
|
1596
|
|
|
1597 /* An l-value of this type has to be passed to the APIs below to cache the
|
|
|
1598 * values of the parameters to a formatted warning message.
|
|
|
1599 */
|
|
|
1600 typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][
|
|
|
1601 PNG_WARNING_PARAMETER_SIZE];
|
|
|
1602
|
|
|
1603 PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p,
|
|
|
1604 int number, png_const_charp string),PNG_EMPTY);
|
|
|
1605 /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,
|
|
|
1606 * including the trailing '\0'.
|
|
|
1607 */
|
|
|
1608 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned,
|
|
|
1609 (png_warning_parameters p, int number, int format, png_alloc_size_t value),
|
|
|
1610 PNG_EMPTY);
|
|
|
1611 /* Use png_alloc_size_t because it is an unsigned type as big as any we
|
|
|
1612 * need to output. Use the following for a signed value.
|
|
|
1613 */
|
|
|
1614 PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed,
|
|
|
1615 (png_warning_parameters p, int number, int format, png_int_32 value),
|
|
|
1616 PNG_EMPTY);
|
|
|
1617
|
|
|
1618 PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr,
|
|
|
1619 png_warning_parameters p, png_const_charp message),PNG_EMPTY);
|
|
|
1620 /* 'message' follows the X/Open approach of using @1, @2 to insert
|
|
|
1621 * parameters previously supplied using the above functions. Errors in
|
|
|
1622 * specifying the parameters will simply result in garbage substitutions.
|
|
|
1623 */
|
|
|
1624 #endif
|
|
|
1625
|
|
|
1626 #ifdef PNG_BENIGN_ERRORS_SUPPORTED
|
|
|
1627 /* Application errors (new in 1.6); use these functions (declared below) for
|
|
|
1628 * errors in the parameters or order of API function calls on read. The
|
|
|
1629 * 'warning' should be used for an error that can be handled completely; the
|
|
|
1630 * 'error' for one which can be handled safely but which may lose application
|
|
|
1631 * information or settings.
|
|
|
1632 *
|
|
|
1633 * By default these both result in a png_error call prior to release, while in a
|
|
|
1634 * released version the 'warning' is just a warning. However if the application
|
|
|
1635 * explicitly disables benign errors (explicitly permitting the code to lose
|
|
|
1636 * information) they both turn into warnings.
|
|
|
1637 *
|
|
|
1638 * If benign errors aren't supported they end up as the corresponding base call
|
|
|
1639 * (png_warning or png_error.)
|
|
|
1640 */
|
|
|
1641 PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr,
|
|
|
1642 png_const_charp message),PNG_EMPTY);
|
|
|
1643 /* The application provided invalid parameters to an API function or called
|
|
|
1644 * an API function at the wrong time, libpng can completely recover.
|
|
|
1645 */
|
|
|
1646
|
|
|
1647 PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr,
|
|
|
1648 png_const_charp message),PNG_EMPTY);
|
|
|
1649 /* As above but libpng will ignore the call, or attempt some other partial
|
|
|
1650 * recovery from the error.
|
|
|
1651 */
|
|
|
1652 #else
|
|
|
1653 # define png_app_warning(pp,s) png_warning(pp,s)
|
|
|
1654 # define png_app_error(pp,s) png_error(pp,s)
|
|
|
1655 #endif
|
|
|
1656
|
|
|
1657 PNG_INTERNAL_FUNCTION(void,png_chunk_report,(png_const_structrp png_ptr,
|
|
|
1658 png_const_charp message, int error),PNG_EMPTY);
|
|
|
1659 /* Report a recoverable issue in chunk data. On read this is used to report
|
|
|
1660 * a problem found while reading a particular chunk and the
|
|
|
1661 * png_chunk_benign_error or png_chunk_warning function is used as
|
|
|
1662 * appropriate. On write this is used to report an error that comes from
|
|
|
1663 * data set via an application call to a png_set_ API and png_app_error or
|
|
|
1664 * png_app_warning is used as appropriate.
|
|
|
1665 *
|
|
|
1666 * The 'error' parameter must have one of the following values:
|
|
|
1667 */
|
|
|
1668 #define PNG_CHUNK_WARNING 0 /* never an error */
|
|
|
1669 #define PNG_CHUNK_WRITE_ERROR 1 /* an error only on write */
|
|
|
1670 #define PNG_CHUNK_ERROR 2 /* always an error */
|
|
|
1671
|
|
|
1672 /* ASCII to FP interfaces, currently only implemented if sCAL
|
|
|
1673 * support is required.
|
|
|
1674 */
|
|
|
1675 #if defined(PNG_sCAL_SUPPORTED)
|
|
|
1676 /* MAX_DIGITS is actually the maximum number of characters in an sCAL
|
|
|
1677 * width or height, derived from the precision (number of significant
|
|
|
1678 * digits - a build time settable option) and assumptions about the
|
|
|
1679 * maximum ridiculous exponent.
|
|
|
1680 */
|
|
|
1681 #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)
|
|
|
1682
|
|
|
1683 #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1684 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr,
|
|
|
1685 png_charp ascii, png_size_t size, double fp, unsigned int precision),
|
|
|
1686 PNG_EMPTY);
|
|
|
1687 #endif /* FLOATING_POINT */
|
|
|
1688
|
|
|
1689 #ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
1690 PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr,
|
|
|
1691 png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY);
|
|
|
1692 #endif /* FIXED_POINT */
|
|
|
1693 #endif /* sCAL */
|
|
|
1694
|
|
|
1695 #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
|
|
|
1696 /* An internal API to validate the format of a floating point number.
|
|
|
1697 * The result is the index of the next character. If the number is
|
|
|
1698 * not valid it will be the index of a character in the supposed number.
|
|
|
1699 *
|
|
|
1700 * The format of a number is defined in the PNG extensions specification
|
|
|
1701 * and this API is strictly conformant to that spec, not anyone elses!
|
|
|
1702 *
|
|
|
1703 * The format as a regular expression is:
|
|
|
1704 *
|
|
|
1705 * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?
|
|
|
1706 *
|
|
|
1707 * or:
|
|
|
1708 *
|
|
|
1709 * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?
|
|
|
1710 *
|
|
|
1711 * The complexity is that either integer or fraction must be present and the
|
|
|
1712 * fraction is permitted to have no digits only if the integer is present.
|
|
|
1713 *
|
|
|
1714 * NOTE: The dangling E problem.
|
|
|
1715 * There is a PNG valid floating point number in the following:
|
|
|
1716 *
|
|
|
1717 * PNG floating point numbers are not greedy.
|
|
|
1718 *
|
|
|
1719 * Working this out requires *TWO* character lookahead (because of the
|
|
|
1720 * sign), the parser does not do this - it will fail at the 'r' - this
|
|
|
1721 * doesn't matter for PNG sCAL chunk values, but it requires more care
|
|
|
1722 * if the value were ever to be embedded in something more complex. Use
|
|
|
1723 * ANSI-C strtod if you need the lookahead.
|
|
|
1724 */
|
|
|
1725 /* State table for the parser. */
|
|
|
1726 #define PNG_FP_INTEGER 0 /* before or in integer */
|
|
|
1727 #define PNG_FP_FRACTION 1 /* before or in fraction */
|
|
|
1728 #define PNG_FP_EXPONENT 2 /* before or in exponent */
|
|
|
1729 #define PNG_FP_STATE 3 /* mask for the above */
|
|
|
1730 #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */
|
|
|
1731 #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */
|
|
|
1732 #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */
|
|
|
1733 #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */
|
|
|
1734 #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */
|
|
|
1735
|
|
|
1736 /* These three values don't affect the parser. They are set but not used.
|
|
|
1737 */
|
|
|
1738 #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */
|
|
|
1739 #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */
|
|
|
1740 #define PNG_FP_NONZERO 256 /* A non-zero value */
|
|
|
1741 #define PNG_FP_STICKY 448 /* The above three flags */
|
|
|
1742
|
|
|
1743 /* This is available for the caller to store in 'state' if required. Do not
|
|
|
1744 * call the parser after setting it (the parser sometimes clears it.)
|
|
|
1745 */
|
|
|
1746 #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */
|
|
|
1747
|
|
|
1748 /* Result codes for the parser (boolean - true meants ok, false means
|
|
|
1749 * not ok yet.)
|
|
|
1750 */
|
|
|
1751 #define PNG_FP_MAYBE 0 /* The number may be valid in the future */
|
|
|
1752 #define PNG_FP_OK 1 /* The number is valid */
|
|
|
1753
|
|
|
1754 /* Tests on the sticky non-zero and negative flags. To pass these checks
|
|
|
1755 * the state must also indicate that the whole number is valid - this is
|
|
|
1756 * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this
|
|
|
1757 * is equivalent to PNG_FP_OK above.)
|
|
|
1758 */
|
|
|
1759 #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)
|
|
|
1760 /* NZ_MASK: the string is valid and a non-zero negative value */
|
|
|
1761 #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)
|
|
|
1762 /* Z MASK: the string is valid and a non-zero value. */
|
|
|
1763 /* PNG_FP_SAW_DIGIT: the string is valid. */
|
|
|
1764 #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)
|
|
|
1765 #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)
|
|
|
1766 #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)
|
|
|
1767
|
|
|
1768 /* The actual parser. This can be called repeatedly. It updates
|
|
|
1769 * the index into the string and the state variable (which must
|
|
|
1770 * be initialized to 0). It returns a result code, as above. There
|
|
|
1771 * is no point calling the parser any more if it fails to advance to
|
|
|
1772 * the end of the string - it is stuck on an invalid character (or
|
|
|
1773 * terminated by '\0').
|
|
|
1774 *
|
|
|
1775 * Note that the pointer will consume an E or even an E+ and then leave
|
|
|
1776 * a 'maybe' state even though a preceding integer.fraction is valid.
|
|
|
1777 * The PNG_FP_WAS_VALID flag indicates that a preceding substring was
|
|
|
1778 * a valid number. It's possible to recover from this by calling
|
|
|
1779 * the parser again (from the start, with state 0) but with a string
|
|
|
1780 * that omits the last character (i.e. set the size to the index of
|
|
|
1781 * the problem character.) This has not been tested within libpng.
|
|
|
1782 */
|
|
|
1783 PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string,
|
|
|
1784 png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY);
|
|
|
1785
|
|
|
1786 /* This is the same but it checks a complete string and returns true
|
|
|
1787 * only if it just contains a floating point number. As of 1.5.4 this
|
|
|
1788 * function also returns the state at the end of parsing the number if
|
|
|
1789 * it was valid (otherwise it returns 0.) This can be used for testing
|
|
|
1790 * for negative or zero values using the sticky flag.
|
|
|
1791 */
|
|
|
1792 PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string,
|
|
|
1793 png_size_t size),PNG_EMPTY);
|
|
|
1794 #endif /* pCAL || sCAL */
|
|
|
1795
|
|
|
1796 #if defined(PNG_GAMMA_SUPPORTED) ||\
|
|
|
1797 defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)
|
|
|
1798 /* Added at libpng version 1.5.0 */
|
|
|
1799 /* This is a utility to provide a*times/div (rounded) and indicate
|
|
|
1800 * if there is an overflow. The result is a boolean - false (0)
|
|
|
1801 * for overflow, true (1) if no overflow, in which case *res
|
|
|
1802 * holds the result.
|
|
|
1803 */
|
|
|
1804 PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a,
|
|
|
1805 png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY);
|
|
|
1806 #endif
|
|
|
1807
|
|
|
1808 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
|
|
|
1809 /* Same deal, but issue a warning on overflow and return 0. */
|
|
|
1810 PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn,
|
|
|
1811 (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by,
|
|
|
1812 png_int_32 divided_by),PNG_EMPTY);
|
|
|
1813 #endif
|
|
|
1814
|
|
|
1815 #ifdef PNG_GAMMA_SUPPORTED
|
|
|
1816 /* Calculate a reciprocal - used for gamma values. This returns
|
|
|
1817 * 0 if the argument is 0 in order to maintain an undefined value;
|
|
|
1818 * there are no warnings.
|
|
|
1819 */
|
|
|
1820 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a),
|
|
|
1821 PNG_EMPTY);
|
|
|
1822
|
|
|
1823 #ifdef PNG_READ_GAMMA_SUPPORTED
|
|
|
1824 /* The same but gives a reciprocal of the product of two fixed point
|
|
|
1825 * values. Accuracy is suitable for gamma calculations but this is
|
|
|
1826 * not exact - use png_muldiv for that. Only required at present on read.
|
|
|
1827 */
|
|
|
1828 PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a,
|
|
|
1829 png_fixed_point b),PNG_EMPTY);
|
|
|
1830 #endif
|
|
|
1831
|
|
|
1832 /* Return true if the gamma value is significantly different from 1.0 */
|
|
|
1833 PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value),
|
|
|
1834 PNG_EMPTY);
|
|
|
1835 #endif
|
|
|
1836
|
|
|
1837 #ifdef PNG_READ_GAMMA_SUPPORTED
|
|
|
1838 /* Internal fixed point gamma correction. These APIs are called as
|
|
|
1839 * required to convert single values - they don't need to be fast,
|
|
|
1840 * they are not used when processing image pixel values.
|
|
|
1841 *
|
|
|
1842 * While the input is an 'unsigned' value it must actually be the
|
|
|
1843 * correct bit value - 0..255 or 0..65535 as required.
|
|
|
1844 */
|
|
|
1845 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr,
|
|
|
1846 unsigned int value, png_fixed_point gamma_value),PNG_EMPTY);
|
|
|
1847 PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value,
|
|
|
1848 png_fixed_point gamma_value),PNG_EMPTY);
|
|
|
1849 PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value,
|
|
|
1850 png_fixed_point gamma_value),PNG_EMPTY);
|
|
|
1851 PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr),
|
|
|
1852 PNG_EMPTY);
|
|
|
1853 PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr,
|
|
|
1854 int bit_depth),PNG_EMPTY);
|
|
|
1855 #endif
|
|
|
1856
|
|
|
1857 /* SIMPLIFIED READ/WRITE SUPPORT */
|
|
|
1858 #if defined(PNG_SIMPLIFIED_READ_SUPPORTED) ||\
|
|
|
1859 defined(PNG_SIMPLIFIED_WRITE_SUPPORTED)
|
|
|
1860 /* The internal structure that png_image::opaque points to. */
|
|
|
1861 typedef struct png_control
|
|
|
1862 {
|
|
|
1863 png_structp png_ptr;
|
|
|
1864 png_infop info_ptr;
|
|
|
1865 png_voidp error_buf; /* Always a jmp_buf at present. */
|
|
|
1866
|
|
|
1867 png_const_bytep memory; /* Memory buffer. */
|
|
|
1868 png_size_t size; /* Size of the memory buffer. */
|
|
|
1869
|
|
|
1870 unsigned int for_write :1; /* Otherwise it is a read structure */
|
|
|
1871 unsigned int owned_file :1; /* We own the file in io_ptr */
|
|
|
1872 } png_control;
|
|
|
1873
|
|
|
1874 /* Return the pointer to the jmp_buf from a png_control: necessary because C
|
|
|
1875 * does not reveal the type of the elements of jmp_buf.
|
|
|
1876 */
|
|
|
1877 #ifdef __cplusplus
|
|
|
1878 # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0])
|
|
|
1879 #else
|
|
|
1880 # define png_control_jmp_buf(pc) ((pc)->error_buf)
|
|
|
1881 #endif
|
|
|
1882
|
|
|
1883 /* Utility to safely execute a piece of libpng code catching and logging any
|
|
|
1884 * errors that might occur. Returns true on success, false on failure (either
|
|
|
1885 * of the function or as a result of a png_error.)
|
|
|
1886 */
|
|
|
1887 PNG_INTERNAL_CALLBACK(void,png_safe_error,(png_structp png_ptr,
|
|
|
1888 png_const_charp error_message),PNG_NORETURN);
|
|
|
1889
|
|
|
1890 #ifdef PNG_WARNINGS_SUPPORTED
|
|
|
1891 PNG_INTERNAL_CALLBACK(void,png_safe_warning,(png_structp png_ptr,
|
|
|
1892 png_const_charp warning_message),PNG_EMPTY);
|
|
|
1893 #else
|
|
|
1894 # define png_safe_warning 0/*dummy argument*/
|
|
|
1895 #endif
|
|
|
1896
|
|
|
1897 PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image,
|
|
|
1898 int (*function)(png_voidp), png_voidp arg),PNG_EMPTY);
|
|
|
1899
|
|
|
1900 /* Utility to log an error; this also cleans up the png_image; the function
|
|
|
1901 * always returns 0 (false).
|
|
|
1902 */
|
|
|
1903 PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image,
|
|
|
1904 png_const_charp error_message),PNG_EMPTY);
|
|
|
1905
|
|
|
1906 #ifndef PNG_SIMPLIFIED_READ_SUPPORTED
|
|
|
1907 /* png_image_free is used by the write code but not exported */
|
|
|
1908 PNG_INTERNAL_FUNCTION(void, png_image_free, (png_imagep image), PNG_EMPTY);
|
|
|
1909 #endif /* !SIMPLIFIED_READ */
|
|
|
1910
|
|
|
1911 #endif /* SIMPLIFIED READ/WRITE */
|
|
|
1912
|
|
|
1913 /* These are initialization functions for hardware specific PNG filter
|
|
|
1914 * optimizations; list these here then select the appropriate one at compile
|
|
|
1915 * time using the macro PNG_FILTER_OPTIMIZATIONS. If the macro is not defined
|
|
|
1916 * the generic code is used.
|
|
|
1917 */
|
|
|
1918 #ifdef PNG_FILTER_OPTIMIZATIONS
|
|
|
1919 PNG_INTERNAL_FUNCTION(void, PNG_FILTER_OPTIMIZATIONS, (png_structp png_ptr,
|
|
|
1920 unsigned int bpp), PNG_EMPTY);
|
|
|
1921 /* Just declare the optimization that will be used */
|
|
|
1922 #else
|
|
|
1923 /* List *all* the possible optimizations here - this branch is required if
|
|
|
1924 * the builder of libpng passes the definition of PNG_FILTER_OPTIMIZATIONS in
|
|
|
1925 * CFLAGS in place of CPPFLAGS *and* uses symbol prefixing.
|
|
|
1926 */
|
|
|
1927 PNG_INTERNAL_FUNCTION(void, png_init_filter_functions_neon,
|
|
|
1928 (png_structp png_ptr, unsigned int bpp), PNG_EMPTY);
|
|
|
1929 #endif
|
|
|
1930
|
|
|
1931 /* Maintainer: Put new private prototypes here ^ */
|
|
|
1932
|
|
|
1933 #include "pngdebug.h"
|
|
|
1934
|
|
|
1935 #ifdef __cplusplus
|
|
|
1936 }
|
|
|
1937 #endif
|
|
|
1938
|
|
|
1939 #endif /* PNG_VERSION_INFO_ONLY */
|
|
|
1940 #endif /* PNGPRIV_H */
|
