2 /* pngconf.h - machine-configurable file for libpng
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4 * libpng version 1.6.37
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6 * Copyright (c) 2018-2019 Cosmin Truta
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7 * Copyright (c) 1998-2002,2004,2006-2016,2018 Glenn Randers-Pehrson
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8 * Copyright (c) 1996-1997 Andreas Dilger
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9 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.
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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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15 * Any machine specific code is near the front of this file, so if you
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16 * are configuring libpng for a machine, you may want to read the section
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17 * starting here down to where it starts to typedef png_color, png_text,
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24 #ifndef PNG_BUILDING_SYMBOL_TABLE /* else includes may cause problems */
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26 /* From libpng 1.6.0 libpng requires an ANSI X3.159-1989 ("ISOC90") compliant C
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27 * compiler for correct compilation. The following header files are required by
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28 * the standard. If your compiler doesn't provide these header files, or they
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29 * do not match the standard, you will need to provide/improve them.
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34 /* Library header files. These header files are all defined by ISOC90; libpng
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35 * expects conformant implementations, however, an ISOC90 conformant system need
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36 * not provide these header files if the functionality cannot be implemented.
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37 * In this case it will be necessary to disable the relevant parts of libpng in
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38 * the build of pnglibconf.h.
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40 * Prior to 1.6.0 string.h was included here; the API changes in 1.6.0 to not
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41 * include this unnecessary header file.
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44 #ifdef PNG_STDIO_SUPPORTED
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45 /* Required for the definition of FILE: */
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49 #ifdef PNG_SETJMP_SUPPORTED
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50 /* Required for the definition of jmp_buf and the declaration of longjmp: */
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51 # include <setjmp.h>
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54 #ifdef PNG_CONVERT_tIME_SUPPORTED
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55 /* Required for struct tm: */
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59 #endif /* PNG_BUILDING_SYMBOL_TABLE */
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61 /* Prior to 1.6.0, it was possible to turn off 'const' in declarations,
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62 * using PNG_NO_CONST. This is no longer supported.
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64 #define PNG_CONST const /* backward compatibility only */
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66 /* This controls optimization of the reading of 16-bit and 32-bit
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67 * values from PNG files. It can be set on a per-app-file basis: it
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68 * just changes whether a macro is used when the function is called.
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69 * The library builder sets the default; if read functions are not
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70 * built into the library the macro implementation is forced on.
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72 #ifndef PNG_READ_INT_FUNCTIONS_SUPPORTED
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73 # define PNG_USE_READ_MACROS
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75 #if !defined(PNG_NO_USE_READ_MACROS) && !defined(PNG_USE_READ_MACROS)
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76 # if PNG_DEFAULT_READ_MACROS
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77 # define PNG_USE_READ_MACROS
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81 /* COMPILER SPECIFIC OPTIONS.
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83 * These options are provided so that a variety of difficult compilers
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84 * can be used. Some are fixed at build time (e.g. PNG_API_RULE
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85 * below) but still have compiler specific implementations, others
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86 * may be changed on a per-file basis when compiling against libpng.
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89 /* The PNGARG macro was used in versions of libpng prior to 1.6.0 to protect
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90 * against legacy (pre ISOC90) compilers that did not understand function
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91 * prototypes. It is not required for modern C compilers.
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94 # define PNGARG(arglist) arglist
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97 /* Function calling conventions.
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98 * =============================
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99 * Normally it is not necessary to specify to the compiler how to call
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100 * a function - it just does it - however on x86 systems derived from
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101 * Microsoft and Borland C compilers ('IBM PC', 'DOS', 'Windows' systems
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102 * and some others) there are multiple ways to call a function and the
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103 * default can be changed on the compiler command line. For this reason
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104 * libpng specifies the calling convention of every exported function and
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105 * every function called via a user supplied function pointer. This is
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106 * done in this file by defining the following macros:
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108 * PNGAPI Calling convention for exported functions.
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109 * PNGCBAPI Calling convention for user provided (callback) functions.
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110 * PNGCAPI Calling convention used by the ANSI-C library (required
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111 * for longjmp callbacks and sometimes used internally to
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112 * specify the calling convention for zlib).
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114 * These macros should never be overridden. If it is necessary to
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115 * change calling convention in a private build this can be done
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116 * by setting PNG_API_RULE (which defaults to 0) to one of the values
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117 * below to select the correct 'API' variants.
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119 * PNG_API_RULE=0 Use PNGCAPI - the 'C' calling convention - throughout.
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120 * This is correct in every known environment.
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121 * PNG_API_RULE=1 Use the operating system convention for PNGAPI and
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122 * the 'C' calling convention (from PNGCAPI) for
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123 * callbacks (PNGCBAPI). This is no longer required
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124 * in any known environment - if it has to be used
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125 * please post an explanation of the problem to the
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126 * libpng mailing list.
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128 * These cases only differ if the operating system does not use the C
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129 * calling convention, at present this just means the above cases
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130 * (x86 DOS/Windows systems) and, even then, this does not apply to
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131 * Cygwin running on those systems.
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133 * Note that the value must be defined in pnglibconf.h so that what
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134 * the application uses to call the library matches the conventions
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135 * set when building the library.
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140 * When building a shared library it is almost always necessary to tell
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141 * the compiler which symbols to export. The png.h macro 'PNG_EXPORT'
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142 * is used to mark the symbols. On some systems these symbols can be
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143 * extracted at link time and need no special processing by the compiler,
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144 * on other systems the symbols are flagged by the compiler and just
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145 * the declaration requires a special tag applied (unfortunately) in a
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146 * compiler dependent way. Some systems can do either.
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148 * A small number of older systems also require a symbol from a DLL to
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149 * be flagged to the program that calls it. This is a problem because
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150 * we do not know in the header file included by application code that
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151 * the symbol will come from a shared library, as opposed to a statically
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152 * linked one. For this reason the application must tell us by setting
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153 * the magic flag PNG_USE_DLL to turn on the special processing before
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154 * it includes png.h.
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156 * Four additional macros are used to make this happen:
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158 * PNG_IMPEXP The magic (if any) to cause a symbol to be exported from
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159 * the build or imported if PNG_USE_DLL is set - compiler
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160 * and system specific.
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162 * PNG_EXPORT_TYPE(type) A macro that pre or appends PNG_IMPEXP to
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163 * 'type', compiler specific.
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165 * PNG_DLL_EXPORT Set to the magic to use during a libpng build to
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166 * make a symbol exported from the DLL. Not used in the
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167 * public header files; see pngpriv.h for how it is used
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168 * in the libpng build.
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170 * PNG_DLL_IMPORT Set to the magic to force the libpng symbols to come
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171 * from a DLL - used to define PNG_IMPEXP when
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172 * PNG_USE_DLL is set.
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175 /* System specific discovery.
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176 * ==========================
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177 * This code is used at build time to find PNG_IMPEXP, the API settings
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178 * and PNG_EXPORT_TYPE(), it may also set a macro to indicate the DLL
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179 * import processing is possible. On Windows systems it also sets
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180 * compiler-specific macros to the values required to change the calling
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181 * conventions of the various functions.
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183 #if defined(_Windows) || defined(_WINDOWS) || defined(WIN32) ||\
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184 defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__)
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185 /* Windows system (DOS doesn't support DLLs). Includes builds under Cygwin or
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186 * MinGW on any architecture currently supported by Windows. Also includes
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187 * Watcom builds but these need special treatment because they are not
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188 * compatible with GCC or Visual C because of different calling conventions.
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190 # if PNG_API_RULE == 2
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191 /* If this line results in an error, either because __watcall is not
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192 * understood or because of a redefine just below you cannot use *this*
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193 * build of the library with the compiler you are using. *This* build was
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194 * build using Watcom and applications must also be built using Watcom!
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196 # define PNGCAPI __watcall
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199 # if defined(__GNUC__) || (defined(_MSC_VER) && (_MSC_VER >= 800))
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200 # define PNGCAPI __cdecl
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201 # if PNG_API_RULE == 1
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202 /* If this line results in an error __stdcall is not understood and
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203 * PNG_API_RULE should not have been set to '1'.
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205 # define PNGAPI __stdcall
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208 /* An older compiler, or one not detected (erroneously) above,
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209 * if necessary override on the command line to get the correct
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210 * variants for the compiler.
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213 # define PNGCAPI _cdecl
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215 # if PNG_API_RULE == 1 && !defined(PNGAPI)
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216 # define PNGAPI _stdcall
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218 # endif /* compiler/api */
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220 /* NOTE: PNGCBAPI always defaults to PNGCAPI. */
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222 # if defined(PNGAPI) && !defined(PNG_USER_PRIVATEBUILD)
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223 # error "PNG_USER_PRIVATEBUILD must be defined if PNGAPI is changed"
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226 # if (defined(_MSC_VER) && _MSC_VER < 800) ||\
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227 (defined(__BORLANDC__) && __BORLANDC__ < 0x500)
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228 /* older Borland and MSC
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229 * compilers used '__export' and required this to be after
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232 # ifndef PNG_EXPORT_TYPE
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233 # define PNG_EXPORT_TYPE(type) type PNG_IMPEXP
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235 # define PNG_DLL_EXPORT __export
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236 # else /* newer compiler */
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237 # define PNG_DLL_EXPORT __declspec(dllexport)
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238 # ifndef PNG_DLL_IMPORT
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239 # define PNG_DLL_IMPORT __declspec(dllimport)
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241 # endif /* compiler */
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243 #else /* !Windows */
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244 # if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
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245 # define PNGAPI _System
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246 # else /* !Windows/x86 && !OS/2 */
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247 /* Use the defaults, or define PNG*API on the command line (but
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248 * this will have to be done for every compile!)
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250 # endif /* other system, !OS/2 */
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251 #endif /* !Windows/x86 */
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253 /* Now do all the defaulting . */
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258 # define PNGCBAPI PNGCAPI
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261 # define PNGAPI PNGCAPI
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264 /* PNG_IMPEXP may be set on the compilation system command line or (if not set)
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265 * then in an internal header file when building the library, otherwise (when
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266 * using the library) it is set here.
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269 # if defined(PNG_USE_DLL) && defined(PNG_DLL_IMPORT)
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270 /* This forces use of a DLL, disallowing static linking */
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271 # define PNG_IMPEXP PNG_DLL_IMPORT
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274 # ifndef PNG_IMPEXP
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275 # define PNG_IMPEXP
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279 /* In 1.5.2 the definition of PNG_FUNCTION has been changed to always treat
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280 * 'attributes' as a storage class - the attributes go at the start of the
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281 * function definition, and attributes are always appended regardless of the
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282 * compiler. This considerably simplifies these macros but may cause problems
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283 * if any compilers both need function attributes and fail to handle them as
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284 * a storage class (this is unlikely.)
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286 #ifndef PNG_FUNCTION
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287 # define PNG_FUNCTION(type, name, args, attributes) attributes type name args
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290 #ifndef PNG_EXPORT_TYPE
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291 # define PNG_EXPORT_TYPE(type) PNG_IMPEXP type
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294 /* The ordinal value is only relevant when preprocessing png.h for symbol
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295 * table entries, so we discard it here. See the .dfn files in the
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296 * scripts directory.
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299 #ifndef PNG_EXPORTA
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300 # define PNG_EXPORTA(ordinal, type, name, args, attributes) \
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301 PNG_FUNCTION(PNG_EXPORT_TYPE(type), (PNGAPI name), PNGARG(args), \
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302 PNG_LINKAGE_API attributes)
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305 /* ANSI-C (C90) does not permit a macro to be invoked with an empty argument,
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306 * so make something non-empty to satisfy the requirement:
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308 #define PNG_EMPTY /*empty list*/
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310 #define PNG_EXPORT(ordinal, type, name, args) \
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311 PNG_EXPORTA(ordinal, type, name, args, PNG_EMPTY)
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313 /* Use PNG_REMOVED to comment out a removed interface. */
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314 #ifndef PNG_REMOVED
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315 # define PNG_REMOVED(ordinal, type, name, args, attributes)
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318 #ifndef PNG_CALLBACK
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319 # define PNG_CALLBACK(type, name, args) type (PNGCBAPI name) PNGARG(args)
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322 /* Support for compiler specific function attributes. These are used
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323 * so that where compiler support is available incorrect use of API
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324 * functions in png.h will generate compiler warnings.
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326 * Added at libpng-1.2.41.
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329 #ifndef PNG_NO_PEDANTIC_WARNINGS
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330 # ifndef PNG_PEDANTIC_WARNINGS_SUPPORTED
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331 # define PNG_PEDANTIC_WARNINGS_SUPPORTED
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335 #ifdef PNG_PEDANTIC_WARNINGS_SUPPORTED
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336 /* Support for compiler specific function attributes. These are used
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337 * so that where compiler support is available, incorrect use of API
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338 * functions in png.h will generate compiler warnings. Added at libpng
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339 * version 1.2.41. Disabling these removes the warnings but may also produce
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340 * less efficient code.
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342 # if defined(__clang__) && defined(__has_attribute)
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343 /* Clang defines both __clang__ and __GNUC__. Check __clang__ first. */
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344 # if !defined(PNG_USE_RESULT) && __has_attribute(__warn_unused_result__)
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345 # define PNG_USE_RESULT __attribute__((__warn_unused_result__))
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347 # if !defined(PNG_NORETURN) && __has_attribute(__noreturn__)
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348 # define PNG_NORETURN __attribute__((__noreturn__))
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350 # if !defined(PNG_ALLOCATED) && __has_attribute(__malloc__)
\r
351 # define PNG_ALLOCATED __attribute__((__malloc__))
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353 # if !defined(PNG_DEPRECATED) && __has_attribute(__deprecated__)
\r
354 # define PNG_DEPRECATED __attribute__((__deprecated__))
\r
356 # if !defined(PNG_PRIVATE)
\r
357 # ifdef __has_extension
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358 # if __has_extension(attribute_unavailable_with_message)
\r
359 # define PNG_PRIVATE __attribute__((__unavailable__(\
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360 "This function is not exported by libpng.")))
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364 # ifndef PNG_RESTRICT
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365 # define PNG_RESTRICT __restrict
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368 # elif defined(__GNUC__)
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369 # ifndef PNG_USE_RESULT
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370 # define PNG_USE_RESULT __attribute__((__warn_unused_result__))
\r
372 # ifndef PNG_NORETURN
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373 # define PNG_NORETURN __attribute__((__noreturn__))
\r
376 # ifndef PNG_ALLOCATED
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377 # define PNG_ALLOCATED __attribute__((__malloc__))
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379 # ifndef PNG_DEPRECATED
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380 # define PNG_DEPRECATED __attribute__((__deprecated__))
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382 # ifndef PNG_PRIVATE
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383 # if 0 /* Doesn't work so we use deprecated instead*/
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384 # define PNG_PRIVATE \
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385 __attribute__((warning("This function is not exported by libpng.")))
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387 # define PNG_PRIVATE \
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388 __attribute__((__deprecated__))
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391 # if ((__GNUC__ > 3) || !defined(__GNUC_MINOR__) || (__GNUC_MINOR__ >= 1))
\r
392 # ifndef PNG_RESTRICT
\r
393 # define PNG_RESTRICT __restrict
\r
395 # endif /* __GNUC__.__GNUC_MINOR__ > 3.0 */
\r
396 # endif /* __GNUC__ >= 3 */
\r
398 # elif defined(_MSC_VER) && (_MSC_VER >= 1300)
\r
399 # ifndef PNG_USE_RESULT
\r
400 # define PNG_USE_RESULT /* not supported */
\r
402 # ifndef PNG_NORETURN
\r
403 # define PNG_NORETURN __declspec(noreturn)
\r
405 # ifndef PNG_ALLOCATED
\r
406 # if (_MSC_VER >= 1400)
\r
407 # define PNG_ALLOCATED __declspec(restrict)
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410 # ifndef PNG_DEPRECATED
\r
411 # define PNG_DEPRECATED __declspec(deprecated)
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413 # ifndef PNG_PRIVATE
\r
414 # define PNG_PRIVATE __declspec(deprecated)
\r
416 # ifndef PNG_RESTRICT
\r
417 # if (_MSC_VER >= 1400)
\r
418 # define PNG_RESTRICT __restrict
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422 # elif defined(__WATCOMC__)
\r
423 # ifndef PNG_RESTRICT
\r
424 # define PNG_RESTRICT __restrict
\r
427 #endif /* PNG_PEDANTIC_WARNINGS */
\r
429 #ifndef PNG_DEPRECATED
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430 # define PNG_DEPRECATED /* Use of this function is deprecated */
\r
432 #ifndef PNG_USE_RESULT
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433 # define PNG_USE_RESULT /* The result of this function must be checked */
\r
435 #ifndef PNG_NORETURN
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436 # define PNG_NORETURN /* This function does not return */
\r
438 #ifndef PNG_ALLOCATED
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439 # define PNG_ALLOCATED /* The result of the function is new memory */
\r
441 #ifndef PNG_PRIVATE
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442 # define PNG_PRIVATE /* This is a private libpng function */
\r
444 #ifndef PNG_RESTRICT
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445 # define PNG_RESTRICT /* The C99 "restrict" feature */
\r
448 #ifndef PNG_FP_EXPORT /* A floating point API. */
\r
449 # ifdef PNG_FLOATING_POINT_SUPPORTED
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450 # define PNG_FP_EXPORT(ordinal, type, name, args)\
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451 PNG_EXPORT(ordinal, type, name, args);
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452 # else /* No floating point APIs */
\r
453 # define PNG_FP_EXPORT(ordinal, type, name, args)
\r
456 #ifndef PNG_FIXED_EXPORT /* A fixed point API. */
\r
457 # ifdef PNG_FIXED_POINT_SUPPORTED
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458 # define PNG_FIXED_EXPORT(ordinal, type, name, args)\
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459 PNG_EXPORT(ordinal, type, name, args);
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460 # else /* No fixed point APIs */
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461 # define PNG_FIXED_EXPORT(ordinal, type, name, args)
\r
465 #ifndef PNG_BUILDING_SYMBOL_TABLE
\r
466 /* Some typedefs to get us started. These should be safe on most of the common
\r
469 * png_uint_32 and png_int_32 may, currently, be larger than required to hold a
\r
470 * 32-bit value however this is not normally advisable.
\r
472 * png_uint_16 and png_int_16 should always be two bytes in size - this is
\r
473 * verified at library build time.
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475 * png_byte must always be one byte in size.
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477 * The checks below use constants from limits.h, as defined by the ISOC90
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480 #if CHAR_BIT == 8 && UCHAR_MAX == 255
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481 typedef unsigned char png_byte;
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483 # error "libpng requires 8-bit bytes"
\r
486 #if INT_MIN == -32768 && INT_MAX == 32767
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487 typedef int png_int_16;
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488 #elif SHRT_MIN == -32768 && SHRT_MAX == 32767
\r
489 typedef short png_int_16;
\r
491 # error "libpng requires a signed 16-bit type"
\r
494 #if UINT_MAX == 65535
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495 typedef unsigned int png_uint_16;
\r
496 #elif USHRT_MAX == 65535
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497 typedef unsigned short png_uint_16;
\r
499 # error "libpng requires an unsigned 16-bit type"
\r
502 #if INT_MIN < -2147483646 && INT_MAX > 2147483646
\r
503 typedef int png_int_32;
\r
504 #elif LONG_MIN < -2147483646 && LONG_MAX > 2147483646
\r
505 typedef long int png_int_32;
\r
507 # error "libpng requires a signed 32-bit (or more) type"
\r
510 #if UINT_MAX > 4294967294U
\r
511 typedef unsigned int png_uint_32;
\r
512 #elif ULONG_MAX > 4294967294U
\r
513 typedef unsigned long int png_uint_32;
\r
515 # error "libpng requires an unsigned 32-bit (or more) type"
\r
518 /* Prior to 1.6.0, it was possible to disable the use of size_t and ptrdiff_t.
\r
519 * From 1.6.0 onwards, an ISO C90 compiler, as well as a standard-compliant
\r
520 * behavior of sizeof and ptrdiff_t are required.
\r
521 * The legacy typedefs are provided here for backwards compatibility.
\r
523 typedef size_t png_size_t;
\r
524 typedef ptrdiff_t png_ptrdiff_t;
\r
526 /* libpng needs to know the maximum value of 'size_t' and this controls the
\r
527 * definition of png_alloc_size_t, below. This maximum value of size_t limits
\r
528 * but does not control the maximum allocations the library makes - there is
\r
529 * direct application control of this through png_set_user_limits().
\r
531 #ifndef PNG_SMALL_SIZE_T
\r
532 /* Compiler specific tests for systems where size_t is known to be less than
\r
533 * 32 bits (some of these systems may no longer work because of the lack of
\r
534 * 'far' support; see above.)
\r
536 # if (defined(__TURBOC__) && !defined(__FLAT__)) ||\
\r
537 (defined(_MSC_VER) && defined(MAXSEG_64K))
\r
538 # define PNG_SMALL_SIZE_T
\r
542 /* png_alloc_size_t is guaranteed to be no smaller than size_t, and no smaller
\r
543 * than png_uint_32. Casts from size_t or png_uint_32 to png_alloc_size_t are
\r
544 * not necessary; in fact, it is recommended not to use them at all, so that
\r
545 * the compiler can complain when something turns out to be problematic.
\r
547 * Casts in the other direction (from png_alloc_size_t to size_t or
\r
548 * png_uint_32) should be explicitly applied; however, we do not expect to
\r
549 * encounter practical situations that require such conversions.
\r
551 * PNG_SMALL_SIZE_T must be defined if the maximum value of size_t is less than
\r
552 * 4294967295 - i.e. less than the maximum value of png_uint_32.
\r
554 #ifdef PNG_SMALL_SIZE_T
\r
555 typedef png_uint_32 png_alloc_size_t;
\r
557 typedef size_t png_alloc_size_t;
\r
560 /* Prior to 1.6.0 libpng offered limited support for Microsoft C compiler
\r
561 * implementations of Intel CPU specific support of user-mode segmented address
\r
562 * spaces, where 16-bit pointers address more than 65536 bytes of memory using
\r
563 * separate 'segment' registers. The implementation requires two different
\r
564 * types of pointer (only one of which includes the segment value.)
\r
566 * If required this support is available in version 1.2 of libpng and may be
\r
567 * available in versions through 1.5, although the correctness of the code has
\r
568 * not been verified recently.
\r
571 /* Typedef for floating-point numbers that are converted to fixed-point with a
\r
572 * multiple of 100,000, e.g., gamma
\r
574 typedef png_int_32 png_fixed_point;
\r
576 /* Add typedefs for pointers */
\r
577 typedef void * png_voidp;
\r
578 typedef const void * png_const_voidp;
\r
579 typedef png_byte * png_bytep;
\r
580 typedef const png_byte * png_const_bytep;
\r
581 typedef png_uint_32 * png_uint_32p;
\r
582 typedef const png_uint_32 * png_const_uint_32p;
\r
583 typedef png_int_32 * png_int_32p;
\r
584 typedef const png_int_32 * png_const_int_32p;
\r
585 typedef png_uint_16 * png_uint_16p;
\r
586 typedef const png_uint_16 * png_const_uint_16p;
\r
587 typedef png_int_16 * png_int_16p;
\r
588 typedef const png_int_16 * png_const_int_16p;
\r
589 typedef char * png_charp;
\r
590 typedef const char * png_const_charp;
\r
591 typedef png_fixed_point * png_fixed_point_p;
\r
592 typedef const png_fixed_point * png_const_fixed_point_p;
\r
593 typedef size_t * png_size_tp;
\r
594 typedef const size_t * png_const_size_tp;
\r
596 #ifdef PNG_STDIO_SUPPORTED
\r
597 typedef FILE * png_FILE_p;
\r
600 #ifdef PNG_FLOATING_POINT_SUPPORTED
\r
601 typedef double * png_doublep;
\r
602 typedef const double * png_const_doublep;
\r
605 /* Pointers to pointers; i.e. arrays */
\r
606 typedef png_byte * * png_bytepp;
\r
607 typedef png_uint_32 * * png_uint_32pp;
\r
608 typedef png_int_32 * * png_int_32pp;
\r
609 typedef png_uint_16 * * png_uint_16pp;
\r
610 typedef png_int_16 * * png_int_16pp;
\r
611 typedef const char * * png_const_charpp;
\r
612 typedef char * * png_charpp;
\r
613 typedef png_fixed_point * * png_fixed_point_pp;
\r
614 #ifdef PNG_FLOATING_POINT_SUPPORTED
\r
615 typedef double * * png_doublepp;
\r
618 /* Pointers to pointers to pointers; i.e., pointer to array */
\r
619 typedef char * * * png_charppp;
\r
621 #endif /* PNG_BUILDING_SYMBOL_TABLE */
\r
623 #endif /* PNGCONF_H */
\r