Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 1 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2 | /* pngpriv.h - private declarations for use inside libpng |
Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 4 | * For conditions of distribution and use, see copyright notice in png.h |
Glenn Randers-Pehrson | 1531bd6 | 2012-01-01 14:45:04 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | 13831bc | 2011-12-21 08:28:28 -0600 | [diff] [blame] | 9 | * Last changed in libpng 1.6.0 [(PENDING RELEASE)] |
Glenn Randers-Pehrson | f5ea1b7 | 2011-01-06 06:42:51 -0600 | [diff] [blame] | 10 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 11 | * This code is released under the libpng license. |
Glenn Randers-Pehrson | c332bbc | 2009-06-25 13:43:50 -0500 | [diff] [blame] | 12 | * For conditions of distribution and use, see the disclaimer |
Glenn Randers-Pehrson | 037023b | 2009-06-24 10:27:36 -0500 | [diff] [blame] | 13 | * and license in png.h |
Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 14 | */ |
| 15 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 16 | /* The symbols declared in this file (including the functions declared |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 17 | * as extern) are PRIVATE. They are not part of the libpng public |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 18 | * interface, and are not recommended for use by regular applications. |
| 19 | * Some of them may become public in the future; others may stay private, |
| 20 | * change in an incompatible way, or even disappear. |
| 21 | * Although the libpng users are not forbidden to include this header, |
| 22 | * they should be well aware of the issues that may arise from doing so. |
| 23 | */ |
| 24 | |
| 25 | #ifndef PNGPRIV_H |
| 26 | #define PNGPRIV_H |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 27 | |
Glenn Randers-Pehrson | b3b7168 | 2011-05-03 22:30:19 -0500 | [diff] [blame] | 28 | /* Feature Test Macros. The following are defined here to ensure that correctly |
| 29 | * implemented libraries reveal the APIs libpng needs to build and hide those |
| 30 | * that are not needed and potentially damaging to the compilation. |
| 31 | * |
| 32 | * Feature Test Macros must be defined before any system header is included (see |
| 33 | * POSIX 1003.1 2.8.2 "POSIX Symbols." |
| 34 | * |
| 35 | * These macros only have an effect if the operating system supports either |
| 36 | * POSIX 1003.1 or C99, or both. On other operating systems (particularly |
| 37 | * Windows/Visual Studio) there is no effect; the OS specific tests below are |
| 38 | * still required (as of 2011-05-02.) |
| 39 | */ |
| 40 | #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ |
Glenn Randers-Pehrson | b3b7168 | 2011-05-03 22:30:19 -0500 | [diff] [blame] | 41 | |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 42 | /* Standard library headers not required by png.h: */ |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 43 | #include <stdlib.h> |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 44 | #include <string.h> |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 45 | |
John Bowler | 7b97965 | 2011-08-16 22:36:43 -0500 | [diff] [blame] | 46 | #define PNGLIB_BUILD /*libpng is being built, not used*/ |
| 47 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 48 | /* If HAVE_CONFIG_H is defined during the build then the build system must |
| 49 | * provide an appropriate "config.h" file on the include path. The header file |
| 50 | * must provide definitions as required below (search for "HAVE_CONFIG_H"); |
| 51 | * see configure.ac for more details of the requirements. The macro |
| 52 | * "PNG_NO_CONFIG_H" is provided for maintainers to test for dependencies on |
| 53 | * 'configure'; define this macro to prevent the configure build including the |
| 54 | * configure generated config.h. Libpng is expected to compile without *any* |
| 55 | * special build system support on a reasonably ANSI-C compliant system. |
| 56 | */ |
| 57 | #if (defined HAVE_CONFIG_H) && !(defined PNG_NO_CONFIG_H) |
| 58 | # include <config.h> |
| 59 | |
| 60 | /* Pick up the definition of 'restrict' from config.h if it was read: */ |
| 61 | # define PNG_RESTRICT restrict |
| 62 | #endif |
| 63 | |
John Bowler | bce7988 | 2012-02-13 11:45:22 -0600 | [diff] [blame] | 64 | /* To support symbol prefixing it is necessary to know *before* including png.h |
| 65 | * whether the fixed point (and maybe other) APIs are exported, because if they |
| 66 | * are not internal definitions may be required. This is handled below just |
| 67 | * before png.h is included, but load the configuration now if it is available. |
| 68 | */ |
| 69 | #ifndef PNGLCONF_H |
| 70 | # include "pnglibconf.h" |
| 71 | #endif |
| 72 | |
| 73 | /* Local renames may change non-exported API functions from png.h */ |
| 74 | #if defined PNG_PREFIX && !defined PNGPREFIX_H |
| 75 | # include "pngprefix.h" |
| 76 | #endif |
| 77 | |
Glenn Randers-Pehrson | aecef09 | 2010-04-17 18:03:02 -0500 | [diff] [blame] | 78 | #ifdef PNG_USER_CONFIG |
| 79 | # include "pngusr.h" |
Glenn Randers-Pehrson | 4f108d8 | 2010-08-24 21:05:43 -0500 | [diff] [blame] | 80 | /* These should have been defined in pngusr.h */ |
| 81 | # ifndef PNG_USER_PRIVATEBUILD |
| 82 | # define PNG_USER_PRIVATEBUILD "Custom libpng build" |
| 83 | # endif |
| 84 | # ifndef PNG_USER_DLLFNAME_POSTFIX |
| 85 | # define PNG_USER_DLLFNAME_POSTFIX "Cb" |
| 86 | # endif |
Glenn Randers-Pehrson | aecef09 | 2010-04-17 18:03:02 -0500 | [diff] [blame] | 87 | #endif |
John Bowler | 7b97965 | 2011-08-16 22:36:43 -0500 | [diff] [blame] | 88 | |
| 89 | /* Is this a build of a DLL where compilation of the object modules requires |
| 90 | * different preprocessor settings to those required for a simple library? If |
| 91 | * so PNG_BUILD_DLL must be set. |
| 92 | * |
| 93 | * If libpng is used inside a DLL but that DLL does not export the libpng APIs |
| 94 | * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a |
| 95 | * static library of libpng then link the DLL against that. |
| 96 | */ |
| 97 | #ifndef PNG_BUILD_DLL |
| 98 | # ifdef DLL_EXPORT |
| 99 | /* This is set by libtool when files are compiled for a DLL; libtool |
| 100 | * always compiles twice, even on systems where it isn't necessary. Set |
| 101 | * PNG_BUILD_DLL in case it is necessary: |
| 102 | */ |
| 103 | # define PNG_BUILD_DLL |
| 104 | # else |
| 105 | # ifdef _WINDLL |
| 106 | /* This is set by the Microsoft Visual Studio IDE in projects that |
| 107 | * build a DLL. It can't easily be removed from those projects (it |
| 108 | * isn't visible in the Visual Studio UI) so it is a fairly reliable |
| 109 | * indication that PNG_IMPEXP needs to be set to the DLL export |
| 110 | * attributes. |
| 111 | */ |
| 112 | # define PNG_BUILD_DLL |
| 113 | # else |
| 114 | # ifdef __DLL__ |
| 115 | /* This is set by the Borland C system when compiling for a DLL |
| 116 | * (as above.) |
| 117 | */ |
| 118 | # define PNG_BUILD_DLL |
| 119 | # else |
| 120 | /* Add additional compiler cases here. */ |
| 121 | # endif |
| 122 | # endif |
| 123 | # endif |
| 124 | #endif /* Setting PNG_BUILD_DLL if required */ |
| 125 | |
| 126 | /* See pngconf.h for more details: the builder of the library may set this on |
| 127 | * the command line to the right thing for the specific compilation system or it |
| 128 | * may be automagically set above (at present we know of no system where it does |
| 129 | * need to be set on the command line.) |
| 130 | * |
| 131 | * PNG_IMPEXP must be set here when building the library to prevent pngconf.h |
| 132 | * setting it to the "import" setting for a DLL build. |
| 133 | */ |
| 134 | #ifndef PNG_IMPEXP |
| 135 | # ifdef PNG_BUILD_DLL |
| 136 | # define PNG_IMPEXP PNG_DLL_EXPORT |
| 137 | # else |
| 138 | /* Not building a DLL, or the DLL doesn't require specific export |
| 139 | * definitions. |
| 140 | */ |
| 141 | # define PNG_IMPEXP |
| 142 | # endif |
| 143 | #endif |
| 144 | |
| 145 | /* No warnings for private or deprecated functions in the build: */ |
| 146 | #ifndef PNG_DEPRECATED |
| 147 | # define PNG_DEPRECATED |
| 148 | #endif |
| 149 | #ifndef PNG_PRIVATE |
| 150 | # define PNG_PRIVATE |
| 151 | #endif |
| 152 | |
John Bowler | bce7988 | 2012-02-13 11:45:22 -0600 | [diff] [blame] | 153 | /* Symbol preprocessing support. |
| 154 | * |
| 155 | * To enable listing global, but internal, symbols the following macros should |
| 156 | * always be used to declare an extern data or function object in this file. |
| 157 | */ |
| 158 | #ifndef PNG_INTERNAL_DATA |
| 159 | # define PNG_INTERNAL_DATA(type, name, array) extern type name array |
| 160 | #endif |
| 161 | |
| 162 | #ifndef PNG_INTERNAL_FUNCTION |
| 163 | # define PNG_INTERNAL_FUNCTION(type, name, args, attributes)\ |
| 164 | extern PNG_FUNCTION(type, name, args, PNG_EMPTY attributes) |
| 165 | #endif |
| 166 | |
| 167 | /* If floating or fixed point APIs are disabled they may still be compiled |
| 168 | * internally. To handle this make sure they are declared as the appropriate |
| 169 | * internal extern function (otherwise the symbol prefixing stuff won't work and |
| 170 | * the functions will be used without definitions.) |
| 171 | * |
| 172 | * NOTE: although all the API functions are declared here they are not all |
| 173 | * actually built! |
| 174 | */ |
| 175 | #ifndef PNG_FP_EXPORT |
| 176 | # ifndef PNG_FLOATING_POINT_SUPPORTED |
| 177 | # define PNG_FP_EXPORT(ordinal, type, name, args)\ |
| 178 | PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); |
| 179 | # endif |
| 180 | #endif |
| 181 | #ifndef PNG_FIXED_EXPORT |
| 182 | # ifndef PNG_FIXED_POINT_SUPPORTED |
| 183 | # define PNG_FIXED_EXPORT(ordinal, type, name, args)\ |
| 184 | PNG_INTERNAL_FUNCTION(type, name, args, PNG_EMPTY); |
| 185 | # endif |
| 186 | #endif |
| 187 | |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 188 | #include "png.h" |
Glenn Randers-Pehrson | c3cd22b | 2010-03-08 21:10:25 -0600 | [diff] [blame] | 189 | #include "pngstruct.h" |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 190 | #include "pnginfo.h" |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 191 | |
John Bowler | 7b97965 | 2011-08-16 22:36:43 -0500 | [diff] [blame] | 192 | /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ |
| 193 | #ifndef PNG_DLL_EXPORT |
| 194 | # define PNG_DLL_EXPORT |
| 195 | #endif |
| 196 | |
Glenn Randers-Pehrson | 4690b89 | 2012-02-24 11:43:31 -0600 | [diff] [blame] | 197 | /* SECURITY and SAFETY: |
| 198 | * |
| 199 | * By default libpng is built without any internal limits on image size, |
| 200 | * individual heap (png_malloc) allocations or the total amount of memory used. |
| 201 | * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used |
| 202 | * (unless individually overridden). These limits are believed to be fairly |
| 203 | * safe, but builders of secure systems should verify the values against the |
| 204 | * real system capabilities. |
| 205 | */ |
| 206 | #ifdef PNG_SAFE_LIMITS_SUPPORTED |
| 207 | /* 'safe' limits */ |
| 208 | # ifndef PNG_USER_WIDTH_MAX |
| 209 | # define PNG_USER_WIDTH_MAX 1000000 |
| 210 | # endif |
| 211 | # ifndef PNG_USER_HEIGHT_MAX |
| 212 | # define PNG_USER_HEIGHT_MAX 1000000 |
| 213 | # endif |
| 214 | # ifndef PNG_USER_CHUNK_CACHE_MAX |
| 215 | # define PNG_USER_CHUNK_CACHE_MAX 128 |
| 216 | # endif |
| 217 | # ifndef PNG_USER_CHUNK_MALLOC_MAX |
| 218 | # define PNG_USER_CHUNK_MALLOC_MAX 8000000 |
| 219 | # endif |
| 220 | #else |
| 221 | /* values for no limits */ |
| 222 | # ifndef PNG_USER_WIDTH_MAX |
| 223 | # define PNG_USER_WIDTH_MAX 0x7fffffff |
| 224 | # endif |
| 225 | # ifndef PNG_USER_HEIGHT_MAX |
| 226 | # define PNG_USER_HEIGHT_MAX 0x7fffffff |
| 227 | # endif |
| 228 | # ifndef PNG_USER_CHUNK_CACHE_MAX |
| 229 | # define PNG_USER_CHUNK_CACHE_MAX 0 |
| 230 | # endif |
| 231 | # ifndef PNG_USER_CHUNK_MALLOC_MAX |
| 232 | # define PNG_USER_CHUNK_MALLOC_MAX 0 |
| 233 | # endif |
| 234 | #endif |
| 235 | |
Glenn Randers-Pehrson | 4c7e820 | 2011-11-26 19:00:01 -0600 | [diff] [blame] | 236 | /* This is used for 16 bit gamma tables -- only the top level pointers are |
| 237 | * const; this could be changed: |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 238 | */ |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 239 | typedef const png_uint_16p * png_const_uint_16pp; |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 240 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 241 | /* Moved to pngpriv.h at libpng-1.5.0 */ |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 242 | /* NOTE: some of these may have been used in external applications as |
| 243 | * these definitions were exposed in pngconf.h prior to 1.5. |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 244 | */ |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 245 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 246 | /* If you are running on a machine where you cannot allocate more |
| 247 | * than 64K of memory at once, uncomment this. While libpng will not |
| 248 | * normally need that much memory in a chunk (unless you load up a very |
| 249 | * large file), zlib needs to know how big of a chunk it can use, and |
| 250 | * libpng thus makes sure to check any memory allocation to verify it |
| 251 | * will fit into memory. |
| 252 | * |
| 253 | * zlib provides 'MAXSEG_64K' which, if defined, indicates the |
| 254 | * same limit and pngconf.h (already included) sets the limit |
| 255 | * if certain operating systems are detected. |
| 256 | */ |
| 257 | #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
| 258 | # define PNG_MAX_MALLOC_64K |
| 259 | #endif |
| 260 | |
Glenn Randers-Pehrson | f3dd1cc | 2011-03-18 22:02:20 -0500 | [diff] [blame] | 261 | #ifndef PNG_UNUSED |
Glenn Randers-Pehrson | 25d2d47 | 2011-01-31 10:25:10 -0600 | [diff] [blame] | 262 | /* Unused formal parameter warnings are silenced using the following macro |
| 263 | * which is expected to have no bad effects on performance (optimizing |
| 264 | * compilers will probably remove it entirely). Note that if you replace |
| 265 | * it with something other than whitespace, you must include the terminating |
| 266 | * semicolon. |
Glenn Randers-Pehrson | d546f43 | 2010-12-04 20:41:36 -0600 | [diff] [blame] | 267 | */ |
Glenn Randers-Pehrson | f3dd1cc | 2011-03-18 22:02:20 -0500 | [diff] [blame] | 268 | # define PNG_UNUSED(param) (void)param; |
| 269 | #endif |
Glenn Randers-Pehrson | bf3293a | 2011-01-28 15:14:43 -0600 | [diff] [blame] | 270 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 271 | /* Just a little check that someone hasn't tried to define something |
| 272 | * contradictory. |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 273 | */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 274 | #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
| 275 | # undef PNG_ZBUF_SIZE |
| 276 | # define PNG_ZBUF_SIZE 65536L |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 277 | #endif |
| 278 | |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 279 | /* PNG_STATIC is used to mark internal file scope functions if they need to be |
| 280 | * accessed for implementation tests (see the code in tests/?*). |
| 281 | */ |
| 282 | #ifndef PNG_STATIC |
| 283 | # define PNG_STATIC static |
| 284 | #endif |
| 285 | |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 286 | /* If warnings or errors are turned off the code is disabled or redirected here. |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 287 | * From 1.5.4 functions have been added to allow very limited formatting of |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 288 | * error and warning messages - this code will also be disabled here. |
Glenn Randers-Pehrson | aecef09 | 2010-04-17 18:03:02 -0500 | [diff] [blame] | 289 | */ |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 290 | #ifdef PNG_WARNINGS_SUPPORTED |
| 291 | # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; |
| 292 | #else |
| 293 | # define png_warning(s1,s2) ((void)(s1)) |
| 294 | # define png_chunk_warning(s1,s2) ((void)(s1)) |
| 295 | # define png_warning_parameter(p,number,string) ((void)0) |
| 296 | # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) |
| 297 | # define png_warning_parameter_signed(p,number,format,value) ((void)0) |
| 298 | # define png_formatted_warning(pp,p,message) ((void)(pp)) |
Glenn Randers-Pehrson | af855e4 | 2011-05-07 10:52:49 -0500 | [diff] [blame] | 299 | # define PNG_WARNING_PARAMETERS(p) |
Glenn Randers-Pehrson | aecef09 | 2010-04-17 18:03:02 -0500 | [diff] [blame] | 300 | #endif |
| 301 | #ifndef PNG_ERROR_TEXT_SUPPORTED |
| 302 | # define png_error(s1,s2) png_err(s1) |
| 303 | # define png_chunk_error(s1,s2) png_err(s1) |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 304 | # define png_fixed_error(s1,s2) png_err(s1) |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 305 | #endif |
| 306 | |
John Bowler | 4fa96a4 | 2011-11-16 16:39:16 -0600 | [diff] [blame] | 307 | /* C allows up-casts from (void*) to any pointer and (const void*) to any |
| 308 | * pointer to a const object. C++ regards this as a type error and requires an |
| 309 | * explicit, static, cast and provides the static_cast<> rune to ensure that |
| 310 | * const is not cast away. |
| 311 | */ |
| 312 | #ifdef __cplusplus |
| 313 | # define png_voidcast(type, value) static_cast<type>(value) |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 314 | # define png_constcast(type, value) const_cast<type>(value) |
John Bowler | b454169 | 2012-04-30 06:31:54 -0500 | [diff] [blame^] | 315 | # define png_aligncast(type, value) \ |
| 316 | static_cast<type>(static_cast<void*>(value)) |
| 317 | # define png_aligncastconst(type, value) \ |
| 318 | static_cast<type>(static_cast<const void*>(value)) |
John Bowler | 4fa96a4 | 2011-11-16 16:39:16 -0600 | [diff] [blame] | 319 | #else |
| 320 | # define png_voidcast(type, value) (value) |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 321 | # define png_constcast(type, value) ((type)(value)) |
John Bowler | b454169 | 2012-04-30 06:31:54 -0500 | [diff] [blame^] | 322 | # define png_aligncast(type, value) ((void*)(value)) |
| 323 | # define png_aligncastconst(type, value) ((const void*)(value)) |
John Bowler | 4fa96a4 | 2011-11-16 16:39:16 -0600 | [diff] [blame] | 324 | #endif /* __cplusplus */ |
| 325 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 326 | /* Some fixed point APIs are still required even if not exported because |
| 327 | * they get used by the corresponding floating point APIs. This magic |
| 328 | * deals with this: |
| 329 | */ |
| 330 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 331 | # define PNGFAPI PNGAPI |
| 332 | #else |
| 333 | # define PNGFAPI /* PRIVATE */ |
| 334 | #endif |
| 335 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 336 | /* Other defines specific to compilers can go here. Try to keep |
| 337 | * them inside an appropriate ifdef/endif pair for portability. |
| 338 | */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 339 | #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
| 340 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
Glenn Randers-Pehrson | 233357e | 2010-07-29 21:49:38 -0500 | [diff] [blame] | 341 | /* png.c requires the following ANSI-C constants if the conversion of |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 342 | * floating point to ASCII is implemented therein: |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 343 | * |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 344 | * DBL_DIG Maximum number of decimal digits (can be set to any constant) |
Glenn Randers-Pehrson | 233357e | 2010-07-29 21:49:38 -0500 | [diff] [blame] | 345 | * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 346 | * DBL_MAX Maximum floating point number (can be set to an arbitrary value) |
| 347 | */ |
| 348 | # include <float.h> |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 349 | |
Glenn Randers-Pehrson | d00bbb2 | 2010-03-14 09:15:49 -0500 | [diff] [blame] | 350 | # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ |
| 351 | defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 352 | /* We need to check that <math.h> hasn't already been included earlier |
| 353 | * as it seems it doesn't agree with <fp.h>, yet we should really use |
| 354 | * <fp.h> if possible. |
| 355 | */ |
| 356 | # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
| 357 | # include <fp.h> |
| 358 | # endif |
| 359 | # else |
| 360 | # include <math.h> |
| 361 | # endif |
| 362 | # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
| 363 | /* Amiga SAS/C: We must include builtin FPU functions when compiling using |
| 364 | * MATH=68881 |
| 365 | */ |
| 366 | # include <m68881.h> |
| 367 | # endif |
| 368 | #endif |
| 369 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 370 | /* This provides the non-ANSI (far) memory allocation routines. */ |
| 371 | #if defined(__TURBOC__) && defined(__MSDOS__) |
| 372 | # include <mem.h> |
| 373 | # include <alloc.h> |
| 374 | #endif |
| 375 | |
| 376 | #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ |
Glenn Randers-Pehrson | f74c5ac | 2009-09-20 07:27:34 -0500 | [diff] [blame] | 377 | defined(_WIN32) || defined(__WIN32__) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 378 | # include <windows.h> /* defines _WINDOWS_ macro */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 379 | #endif |
| 380 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 381 | /* Moved here around 1.5.0beta36 from pngconf.h */ |
| 382 | /* Users may want to use these so they are not private. Any library |
| 383 | * functions that are passed far data must be model-independent. |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 384 | */ |
| 385 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 386 | /* Memory model/platform independent fns */ |
| 387 | #ifndef PNG_ABORT |
| 388 | # ifdef _WINDOWS_ |
| 389 | # define PNG_ABORT() ExitProcess(0) |
| 390 | # else |
| 391 | # define PNG_ABORT() abort() |
| 392 | # endif |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 393 | #endif |
| 394 | |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 395 | /* Prior to 1.6.0 if _WINDOWS_ was defined 'lstrlenA' and 'CopyMemory' were used |
Glenn Randers-Pehrson | 4c7e820 | 2011-11-26 19:00:01 -0600 | [diff] [blame] | 396 | * in place of the ISOC90 functions; this is no longer done in 1.6.0, however |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 397 | * the use of png_foo as a macro defined to the C function is retained. |
| 398 | */ |
| 399 | #define png_strlen strlen |
| 400 | #define png_memcmp memcmp |
| 401 | #define png_memcpy memcpy |
| 402 | #define png_memset memset |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 403 | |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 404 | /* These macros may need to be architecture dependent. */ |
| 405 | #define PNG_ALIGN_NONE 0 /* do not use data alignment */ |
| 406 | #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 407 | #ifdef offsetof |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 408 | # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ |
| 409 | #else |
| 410 | # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ |
| 411 | #endif |
| 412 | #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ |
| 413 | |
| 414 | #ifndef PNG_ALIGN_TYPE |
| 415 | /* Default to using aligned access optimizations and requiring alignment to a |
| 416 | * multiple of the data type size. Override in a compiler specific fashion |
| 417 | * if necessary by inserting tests here: |
| 418 | */ |
| 419 | # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE |
| 420 | #endif |
| 421 | |
| 422 | #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE |
| 423 | /* This is used because in some compiler implementations non-aligned |
| 424 | * structure members are supported, so the offsetof approach below fails. |
| 425 | * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access |
| 426 | * is good for performance. Do not do this unless you have tested the result |
| 427 | * and understand it. |
| 428 | */ |
| 429 | # define png_alignof(type) (sizeof (type)) |
| 430 | #else |
| 431 | # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET |
| 432 | # define png_alignof(type) offsetof(struct{char c; type t;}, t) |
| 433 | # else |
| 434 | # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS |
| 435 | # define png_alignof(type) (1) |
| 436 | # endif |
| 437 | /* Else leave png_alignof undefined to prevent use thereof */ |
| 438 | # endif |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 439 | #endif |
| 440 | |
| 441 | /* This implicitly assumes alignment is always to a power of 2. */ |
| 442 | #ifdef png_alignof |
| 443 | # define png_isaligned(ptr, type)\ |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 444 | ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 445 | #else |
| 446 | # define png_isaligned(ptr, type) 0 |
| 447 | #endif |
| 448 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 449 | /* End of memory model/platform independent support */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 450 | /* End of 1.5.0beta36 move from pngconf.h */ |
| 451 | |
| 452 | /* CONSTANTS and UTILITY MACROS |
| 453 | * These are used internally by libpng and not exposed in the API |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 454 | */ |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 455 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 456 | /* Various modes of operation. Note that after an init, mode is set to |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 457 | * zero automatically when the structure is created. Three of these |
| 458 | * are defined in png.h because they need to be visible to applications |
| 459 | * that call png_set_unknown_chunk(). |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 460 | */ |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 461 | /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ |
| 462 | /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 463 | #define PNG_HAVE_IDAT 0x04 |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 464 | /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 465 | #define PNG_HAVE_IEND 0x10 |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 466 | /* 0x20 (unused) */ |
| 467 | /* 0x40 (unused) */ |
| 468 | /* 0x80 (unused) */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 469 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
| 470 | #define PNG_WROTE_tIME 0x200 |
| 471 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
| 472 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
| 473 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 474 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 475 | /* 0x4000 (unused) */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 476 | #define PNG_IS_READ_STRUCT 0x8000 /* Else is a write struct */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 477 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 478 | /* Flags for the transformations the PNG library does on the image data */ |
Glenn Randers-Pehrson | 1916f6a | 2008-08-14 13:44:49 -0500 | [diff] [blame] | 479 | #define PNG_BGR 0x0001 |
| 480 | #define PNG_INTERLACE 0x0002 |
| 481 | #define PNG_PACK 0x0004 |
| 482 | #define PNG_SHIFT 0x0008 |
| 483 | #define PNG_SWAP_BYTES 0x0010 |
| 484 | #define PNG_INVERT_MONO 0x0020 |
Glenn Randers-Pehrson | 3cd7cff | 2010-04-16 19:27:08 -0500 | [diff] [blame] | 485 | #define PNG_QUANTIZE 0x0040 |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 486 | #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ |
Glenn Randers-Pehrson | 1916f6a | 2008-08-14 13:44:49 -0500 | [diff] [blame] | 487 | #define PNG_BACKGROUND_EXPAND 0x0100 |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 488 | #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 489 | #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ |
Glenn Randers-Pehrson | 1916f6a | 2008-08-14 13:44:49 -0500 | [diff] [blame] | 490 | #define PNG_RGBA 0x0800 |
| 491 | #define PNG_EXPAND 0x1000 |
| 492 | #define PNG_GAMMA 0x2000 |
| 493 | #define PNG_GRAY_TO_RGB 0x4000 |
Glenn Randers-Pehrson | d326111 | 2011-09-15 08:12:08 -0500 | [diff] [blame] | 494 | #define PNG_FILLER 0x8000 |
| 495 | #define PNG_PACKSWAP 0x10000 |
| 496 | #define PNG_SWAP_ALPHA 0x20000 |
| 497 | #define PNG_STRIP_ALPHA 0x40000 |
| 498 | #define PNG_INVERT_ALPHA 0x80000 |
| 499 | #define PNG_USER_TRANSFORM 0x100000 |
| 500 | #define PNG_RGB_TO_GRAY_ERR 0x200000 |
| 501 | #define PNG_RGB_TO_GRAY_WARN 0x400000 |
| 502 | #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ |
| 503 | #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ |
| 504 | #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ |
| 505 | #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ |
| 506 | #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ |
| 507 | /* 0x8000000 unused */ |
| 508 | /* 0x10000000 unused */ |
| 509 | /* 0x20000000 unused */ |
| 510 | /* 0x40000000 unused */ |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 511 | /* Flags for png_create_struct */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 512 | #define PNG_STRUCT_PNG 0x0001 |
| 513 | #define PNG_STRUCT_INFO 0x0002 |
| 514 | |
| 515 | /* Scaling factor for filter heuristic weighting calculations */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 516 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 517 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| 518 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 519 | /* Flags for the png_ptr->flags rather than declaring a byte for each one */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 520 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 521 | #define PNG_FLAG_ZSTREAM_INITIALIZED 0x0002 /* Added to libpng-1.6.0 */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 522 | /* 0x0004 unused */ |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 523 | #define PNG_FLAG_ZSTREAM_ENDED 0x0008 /* Added to libpng-1.6.0 */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 524 | /* 0x0010 unused */ |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 525 | /* 0x0020 unused */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 526 | #define PNG_FLAG_ROW_INIT 0x0040 |
| 527 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
| 528 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| 529 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| 530 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| 531 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 532 | #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ |
| 533 | #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ |
| 534 | #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 535 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 536 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 |
| 537 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 |
| 538 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 |
| 539 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 |
| 540 | #define PNG_FLAG_BENIGN_ERRORS_WARN 0x100000 /* Added to libpng-1.4.0 */ |
John Bowler | 2bc76ff | 2012-03-18 22:37:25 -0500 | [diff] [blame] | 541 | #define PNG_FLAG_APP_WARNINGS_WARN 0x200000 /* Added to libpng-1.6.0 */ |
| 542 | #define PNG_FLAG_APP_ERRORS_WARN 0x400000 /* Added to libpng-1.6.0 */ |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 543 | /* 0x800000 unused */ |
| 544 | /* 0x1000000 unused */ |
| 545 | /* 0x2000000 unused */ |
| 546 | /* 0x4000000 unused */ |
| 547 | /* 0x8000000 unused */ |
| 548 | /* 0x10000000 unused */ |
| 549 | /* 0x20000000 unused */ |
| 550 | /* 0x40000000 unused */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 551 | |
| 552 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| 553 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 554 | |
| 555 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| 556 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 557 | |
| 558 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| 559 | PNG_FLAG_CRC_CRITICAL_MASK) |
| 560 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 561 | /* Save typing and make code easier to understand */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 562 | |
| 563 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| 564 | abs((int)((c1).green) - (int)((c2).green)) + \ |
| 565 | abs((int)((c1).blue) - (int)((c2).blue))) |
| 566 | |
Glenn Randers-Pehrson | efc4b69 | 2011-11-07 23:31:34 -0600 | [diff] [blame] | 567 | /* Added to libpng-1.5.7: sRGB conversion tables */ |
Glenn Randers-Pehrson | 8596468 | 2011-11-16 08:52:36 -0600 | [diff] [blame] | 568 | #if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ |
| 569 | defined PNG_SIMPLIFIED_WRITE_SUPPORTED |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 570 | #ifdef PNG_SIMPLIFIED_READ_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 571 | PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_table, [256]); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 572 | /* Convert from an sRGB encoded value 0..255 to a 16-bit linear value, |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 573 | * 0..65535. This table gives the closest 16-bit answers (no errors). |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 574 | */ |
| 575 | #endif |
| 576 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 577 | PNG_INTERNAL_DATA(const png_uint_16, png_sRGB_base, [512]); |
| 578 | PNG_INTERNAL_DATA(const png_byte, png_sRGB_delta, [512]); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 579 | |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 580 | #define PNG_sRGB_FROM_LINEAR(linear) ((png_byte)((png_sRGB_base[(linear)>>15] +\ |
| 581 | ((((linear)&0x7fff)*png_sRGB_delta[(linear)>>15])>>12)) >> 8)) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 582 | /* Given a value 'linear' in the range 0..255*65535 calculate the 8-bit sRGB |
| 583 | * encoded value with maximum error 0.646365. Note that the input is not a |
| 584 | * 16-bit value; it has been multiplied by 255! */ |
Glenn Randers-Pehrson | 8596468 | 2011-11-16 08:52:36 -0600 | [diff] [blame] | 585 | #endif /* PNG_SIMPLIFIED_READ/WRITE */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 586 | |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 587 | /* Added to libpng-1.6.0: scale a 16-bit value in the range 0..65535 to 0..255 |
| 588 | * by dividing by 257 *with rounding*. This macro is exact for the given range. |
| 589 | * See the discourse in pngrtran.c png_do_scale_16_to_8. The values in the |
| 590 | * macro were established by experiment (modifying the added value). The macro |
| 591 | * has a second variant that takes a value already scaled by 255 and divides by |
| 592 | * 65535 - this has a maximum error of .502. Over the range 0..65535*65535 it |
| 593 | * only gives off-by-one errors and only for 0.5% (1 in 200) of the values. |
| 594 | */ |
| 595 | #define PNG_DIV65535(v24) (((v24) + 32895) >> 16) |
| 596 | #define PNG_DIV257(v16) PNG_DIV65535((png_uint_32)(v16) * 255) |
| 597 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 598 | /* Added to libpng-1.2.6 JB */ |
| 599 | #define PNG_ROWBYTES(pixel_bits, width) \ |
| 600 | ((pixel_bits) >= 8 ? \ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 601 | ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
| 602 | (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 603 | |
| 604 | /* PNG_OUT_OF_RANGE returns true if value is outside the range |
Glenn Randers-Pehrson | 9bf6083 | 2009-09-20 13:37:50 -0500 | [diff] [blame] | 605 | * ideal-delta..ideal+delta. Each argument is evaluated twice. |
| 606 | * "ideal" and "delta" should be constants, normally simple |
| 607 | * integers, "value" a variable. Added to libpng-1.2.6 JB |
| 608 | */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 609 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 610 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 611 | |
Glenn Randers-Pehrson | 363f96e | 2010-08-11 09:00:26 -0500 | [diff] [blame] | 612 | /* Conversions between fixed and floating point, only defined if |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 613 | * required (to make sure the code doesn't accidentally use float |
| 614 | * when it is supposedly disabled.) |
| 615 | */ |
| 616 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | 233357e | 2010-07-29 21:49:38 -0500 | [diff] [blame] | 617 | /* The floating point conversion can't overflow, though it can and |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 618 | * does lose accuracy relative to the original fixed point value. |
| 619 | * In practice this doesn't matter because png_fixed_point only |
| 620 | * stores numbers with very low precision. The png_ptr and s |
| 621 | * arguments are unused by default but are there in case error |
| 622 | * checking becomes a requirement. |
| 623 | */ |
| 624 | #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) |
| 625 | |
Glenn Randers-Pehrson | 233357e | 2010-07-29 21:49:38 -0500 | [diff] [blame] | 626 | /* The fixed point conversion performs range checking and evaluates |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 627 | * its argument multiple times, so must be used with care. The |
| 628 | * range checking uses the PNG specification values for a signed |
| 629 | * 32 bit fixed point value except that the values are deliberately |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 630 | * rounded-to-zero to an integral value - 21474 (21474.83 is roughly |
| 631 | * (2^31-1) * 100000). 's' is a string that describes the value being |
| 632 | * converted. |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 633 | * |
| 634 | * NOTE: this macro will raise a png_error if the range check fails, |
| 635 | * therefore it is normally only appropriate to use this on values |
| 636 | * that come from API calls or other sources where an out of range |
| 637 | * error indicates a programming error, not a data error! |
| 638 | * |
| 639 | * NOTE: by default this is off - the macro is not used - because the |
| 640 | * function call saves a lot of code. |
| 641 | */ |
| 642 | #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED |
| 643 | #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 644 | ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 645 | #endif |
John Bowler | bce7988 | 2012-02-13 11:45:22 -0600 | [diff] [blame] | 646 | /* else the corresponding function is defined below, inside the scope of the |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 647 | * cplusplus test. |
| 648 | */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 649 | #endif |
| 650 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 651 | /* Constants for known chunk types. If you need to add a chunk, define the name |
| 652 | * here. For historical reasons these constants have the form png_<name>; i.e. |
| 653 | * the prefix is lower case. Please use decimal values as the parameters to |
| 654 | * match the ISO PNG specification and to avoid relying on the C locale |
| 655 | * interpretation of character values. |
| 656 | * |
| 657 | * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values |
| 658 | * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string |
| 659 | * to be generated if required. |
| 660 | * |
| 661 | * PNG_32b correctly produces a value shifted by up to 24 bits, even on |
| 662 | * architectures where (int) is only 16 bits. |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 663 | */ |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 664 | #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) |
| 665 | #define PNG_CHUNK(b1,b2,b3,b4) \ |
| 666 | (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) |
| 667 | |
| 668 | #define png_IHDR PNG_CHUNK( 73, 72, 68, 82) |
| 669 | #define png_IDAT PNG_CHUNK( 73, 68, 65, 84) |
| 670 | #define png_IEND PNG_CHUNK( 73, 69, 78, 68) |
| 671 | #define png_PLTE PNG_CHUNK( 80, 76, 84, 69) |
| 672 | #define png_bKGD PNG_CHUNK( 98, 75, 71, 68) |
| 673 | #define png_cHRM PNG_CHUNK( 99, 72, 82, 77) |
| 674 | #define png_gAMA PNG_CHUNK(103, 65, 77, 65) |
| 675 | #define png_hIST PNG_CHUNK(104, 73, 83, 84) |
| 676 | #define png_iCCP PNG_CHUNK(105, 67, 67, 80) |
| 677 | #define png_iTXt PNG_CHUNK(105, 84, 88, 116) |
| 678 | #define png_oFFs PNG_CHUNK(111, 70, 70, 115) |
| 679 | #define png_pCAL PNG_CHUNK(112, 67, 65, 76) |
| 680 | #define png_sCAL PNG_CHUNK(115, 67, 65, 76) |
| 681 | #define png_pHYs PNG_CHUNK(112, 72, 89, 115) |
| 682 | #define png_sBIT PNG_CHUNK(115, 66, 73, 84) |
| 683 | #define png_sPLT PNG_CHUNK(115, 80, 76, 84) |
| 684 | #define png_sRGB PNG_CHUNK(115, 82, 71, 66) |
| 685 | #define png_sTER PNG_CHUNK(115, 84, 69, 82) |
| 686 | #define png_tEXt PNG_CHUNK(116, 69, 88, 116) |
| 687 | #define png_tIME PNG_CHUNK(116, 73, 77, 69) |
| 688 | #define png_tRNS PNG_CHUNK(116, 82, 78, 83) |
| 689 | #define png_zTXt PNG_CHUNK(122, 84, 88, 116) |
| 690 | |
| 691 | /* The following will work on (signed char*) strings, whereas the get_uint_32 |
| 692 | * macro will fail on top-bit-set values because of the sign extension. |
| 693 | */ |
| 694 | #define PNG_CHUNK_FROM_STRING(s)\ |
| 695 | PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) |
| 696 | |
| 697 | /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is |
| 698 | * signed and the argument is a (char[]) This macro will fail miserably on |
| 699 | * systems where (char) is more than 8 bits. |
| 700 | */ |
| 701 | #define PNG_STRING_FROM_CHUNK(s,c)\ |
| 702 | (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ |
Glenn Randers-Pehrson | d02d6a1 | 2011-09-26 16:43:08 -0500 | [diff] [blame] | 703 | ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 704 | |
| 705 | /* Do the same but terminate with a null character. */ |
| 706 | #define PNG_CSTRING_FROM_CHUNK(s,c)\ |
| 707 | (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) |
| 708 | |
| 709 | /* Test on flag values as defined in the spec (section 5.4): */ |
| 710 | #define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29)) |
| 711 | #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c)) |
| 712 | #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) |
| 713 | #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) |
| 714 | #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 715 | |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 716 | /* Gamma values (new at libpng-1.5.4): */ |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 717 | #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ |
| 718 | #define PNG_GAMMA_MAC_INVERSE 65909 |
| 719 | #define PNG_GAMMA_sRGB_INVERSE 45455 |
| 720 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 721 | |
| 722 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| 723 | #ifdef __cplusplus |
| 724 | extern "C" { |
| 725 | #endif /* __cplusplus */ |
| 726 | |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 727 | /* Internal functions; these are not exported from a DLL however because they |
| 728 | * are used within several of the C source files they have to be C extern. |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 729 | * |
| 730 | * All of these functions must be declared with PNG_INTERNAL_FUNCTION. |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 731 | */ |
| 732 | |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 733 | /* Zlib support */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 734 | #define PNG_UNEXPECTED_ZLIB_RETURN (-7) |
| 735 | PNG_INTERNAL_FUNCTION(void, png_zstream_error,(png_structrp png_ptr, int ret), |
| 736 | PNG_EMPTY); |
| 737 | /* Used by the zlib handling functions to ensure that z_stream::msg is always |
| 738 | * set before they return. |
| 739 | */ |
| 740 | |
| 741 | #ifdef PNG_WRITE_SUPPORTED |
| 742 | PNG_INTERNAL_FUNCTION(void,png_free_buffer_list,(png_structrp png_ptr, |
| 743 | png_compression_bufferp *list),PNG_EMPTY); |
| 744 | /* Free the buffer list used by the compressed write code. */ |
| 745 | #endif |
John Bowler | 42a2b55 | 2012-03-05 20:57:40 -0600 | [diff] [blame] | 746 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 747 | #if defined PNG_FLOATING_POINT_SUPPORTED &&\ |
| 748 | !defined PNG_FIXED_POINT_MACRO_SUPPORTED |
| 749 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_fixed,(png_const_structrp png_ptr, |
| 750 | double fp, png_const_charp text),PNG_EMPTY); |
| 751 | #endif |
| 752 | |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 753 | /* Check the user version string for compatibility, returns false if the version |
| 754 | * numbers aren't compatible. |
| 755 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 756 | PNG_INTERNAL_FUNCTION(int,png_user_version_check,(png_structrp png_ptr, |
| 757 | png_const_charp user_png_ver),PNG_EMPTY); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 758 | |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 759 | /* Internal base allocator - no messages, NULL on failure to allocate. This |
| 760 | * does, however, call the application provided allocator and that could call |
| 761 | * png_error (although that would be a bug in the application implementation.) |
| 762 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 763 | PNG_INTERNAL_FUNCTION(png_voidp,png_malloc_base,(png_const_structrp png_ptr, |
| 764 | png_alloc_size_t size),PNG_ALLOCATED); |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 765 | |
| 766 | /* Magic to create a struct when there is no struct to call the user supplied |
| 767 | * memory allocators. Because error handling has not been set up the memory |
| 768 | * handlers can't safely call png_error, but this is an obscure and undocumented |
| 769 | * restriction so libpng has to assume that the 'free' handler, at least, might |
| 770 | * call png_error. |
| 771 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 772 | PNG_INTERNAL_FUNCTION(png_structp,png_create_png_struct, |
| 773 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
| 774 | png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, |
| 775 | png_free_ptr free_fn),PNG_ALLOCATED); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 776 | |
| 777 | /* Free memory from internal libpng struct */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 778 | PNG_INTERNAL_FUNCTION(void,png_destroy_png_struct,(png_structrp png_ptr), |
| 779 | PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 780 | |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 781 | /* Free an allocated jmp_buf (always succeeds) */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 782 | PNG_INTERNAL_FUNCTION(void,png_free_jmpbuf,(png_structrp png_ptr),PNG_EMPTY); |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 783 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 784 | /* Function to allocate memory for zlib. PNGAPI is disallowed. */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 785 | PNG_INTERNAL_FUNCTION(voidpf,png_zalloc,(voidpf png_ptr, uInt items, uInt size), |
| 786 | PNG_ALLOCATED); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 787 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 788 | /* Function to free memory for zlib. PNGAPI is disallowed. */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 789 | PNG_INTERNAL_FUNCTION(void,png_zfree,(voidpf png_ptr, voidpf ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 790 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 791 | /* Next four functions are used internally as callbacks. PNGCBAPI is required |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 792 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
| 793 | * PNGCBAPI at 1.5.0 |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 794 | */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 795 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 796 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_read_data,(png_structp png_ptr, |
| 797 | png_bytep data, png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 798 | |
| 799 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 800 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_push_fill_buffer,(png_structp png_ptr, |
| 801 | png_bytep buffer, png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 802 | #endif |
| 803 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 804 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_write_data,(png_structp png_ptr, |
| 805 | png_bytep data, png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 806 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 807 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 808 | # ifdef PNG_STDIO_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 809 | PNG_INTERNAL_FUNCTION(void PNGCBAPI,png_default_flush,(png_structp png_ptr), |
| 810 | PNG_EMPTY); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 811 | # endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 812 | #endif |
| 813 | |
| 814 | /* Reset the CRC variable */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 815 | PNG_INTERNAL_FUNCTION(void,png_reset_crc,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 816 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 817 | /* Write the "data" buffer to whatever output you are using */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 818 | PNG_INTERNAL_FUNCTION(void,png_write_data,(png_structrp png_ptr, |
| 819 | png_const_bytep data, png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 820 | |
Glenn Randers-Pehrson | a581556 | 2010-11-20 21:48:29 -0600 | [diff] [blame] | 821 | /* Read and check the PNG file signature */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 822 | PNG_INTERNAL_FUNCTION(void,png_read_sig,(png_structrp png_ptr, |
| 823 | png_inforp info_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | a581556 | 2010-11-20 21:48:29 -0600 | [diff] [blame] | 824 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 825 | /* Read the chunk header (length + type name) */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 826 | PNG_INTERNAL_FUNCTION(png_uint_32,png_read_chunk_header,(png_structrp png_ptr), |
| 827 | PNG_EMPTY); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 828 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 829 | /* Read data from whatever input you are using into the "data" buffer */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 830 | PNG_INTERNAL_FUNCTION(void,png_read_data,(png_structrp png_ptr, png_bytep data, |
| 831 | png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 832 | |
| 833 | /* Read bytes into buf, and update png_ptr->crc */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 834 | PNG_INTERNAL_FUNCTION(void,png_crc_read,(png_structrp png_ptr, png_bytep buf, |
John Bowler | 0ae4f7b | 2012-03-03 21:10:26 -0600 | [diff] [blame] | 835 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 836 | |
| 837 | /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 838 | PNG_INTERNAL_FUNCTION(int,png_crc_finish,(png_structrp png_ptr, |
| 839 | png_uint_32 skip),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 840 | |
| 841 | /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 842 | PNG_INTERNAL_FUNCTION(int,png_crc_error,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 843 | |
| 844 | /* Calculate the CRC over a section of data. Note that we are only |
| 845 | * passing a maximum of 64K on systems that have this as a memory limit, |
| 846 | * since this is the maximum buffer size we can specify. |
| 847 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 848 | PNG_INTERNAL_FUNCTION(void,png_calculate_crc,(png_structrp png_ptr, |
| 849 | png_const_bytep ptr, png_size_t length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 850 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 851 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 852 | PNG_INTERNAL_FUNCTION(void,png_flush,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 853 | #endif |
| 854 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 855 | /* Write various chunks */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 856 | |
| 857 | /* Write the IHDR chunk, and update the png_struct with the necessary |
| 858 | * information. |
| 859 | */ |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 860 | PNG_INTERNAL_FUNCTION(void,png_write_IHDR,(png_structrp png_ptr, |
| 861 | png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, |
| 862 | int compression_method, int filter_method, int interlace_method),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 863 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 864 | PNG_INTERNAL_FUNCTION(void,png_write_PLTE,(png_structrp png_ptr, |
| 865 | png_const_colorp palette, png_uint_32 num_pal),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 866 | |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 867 | PNG_INTERNAL_FUNCTION(void,png_compress_IDAT,(png_structrp png_ptr, |
| 868 | png_const_bytep row_data, png_alloc_size_t row_data_length, int flush), |
| 869 | PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 870 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 871 | PNG_INTERNAL_FUNCTION(void,png_write_IEND,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 872 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 873 | #ifdef PNG_WRITE_gAMA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 874 | PNG_INTERNAL_FUNCTION(void,png_write_gAMA_fixed,(png_structrp png_ptr, |
| 875 | png_fixed_point file_gamma),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 876 | #endif |
| 877 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 878 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 879 | PNG_INTERNAL_FUNCTION(void,png_write_sBIT,(png_structrp png_ptr, |
| 880 | png_const_color_8p sbit, int color_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 881 | #endif |
| 882 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 883 | #ifdef PNG_WRITE_cHRM_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 884 | PNG_INTERNAL_FUNCTION(void,png_write_cHRM_fixed,(png_structrp png_ptr, |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 885 | const png_xy *xy), PNG_EMPTY); |
| 886 | /* The xy value must have been previously validated */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 887 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 888 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 889 | #ifdef PNG_WRITE_sRGB_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 890 | PNG_INTERNAL_FUNCTION(void,png_write_sRGB,(png_structrp png_ptr, |
| 891 | int intent),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 892 | #endif |
| 893 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 894 | #ifdef PNG_WRITE_iCCP_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 895 | PNG_INTERNAL_FUNCTION(void,png_write_iCCP,(png_structrp png_ptr, |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 896 | png_const_charp name, png_const_bytep profile), PNG_EMPTY); |
| 897 | /* The profile must have been previously validated for correctness, the |
| 898 | * length comes from the first four bytes. Only the base, deflate, |
| 899 | * compression is supported. |
| 900 | */ |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 901 | #endif |
| 902 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 903 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 904 | PNG_INTERNAL_FUNCTION(void,png_write_sPLT,(png_structrp png_ptr, |
| 905 | png_const_sPLT_tp palette),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 906 | #endif |
| 907 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 908 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 909 | PNG_INTERNAL_FUNCTION(void,png_write_tRNS,(png_structrp png_ptr, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 910 | png_const_bytep trans, png_const_color_16p values, int number, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 911 | int color_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 912 | #endif |
| 913 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 914 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 915 | PNG_INTERNAL_FUNCTION(void,png_write_bKGD,(png_structrp png_ptr, |
| 916 | png_const_color_16p values, int color_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 917 | #endif |
| 918 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 919 | #ifdef PNG_WRITE_hIST_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 920 | PNG_INTERNAL_FUNCTION(void,png_write_hIST,(png_structrp png_ptr, |
| 921 | png_const_uint_16p hist, int num_hist),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 922 | #endif |
| 923 | |
Glenn Randers-Pehrson | 205483d | 2011-04-01 12:33:42 -0500 | [diff] [blame] | 924 | /* Chunks that have keywords */ |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 925 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 926 | PNG_INTERNAL_FUNCTION(void,png_write_tEXt,(png_structrp png_ptr, |
| 927 | png_const_charp key, png_const_charp text, png_size_t text_len),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 928 | #endif |
| 929 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 930 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 931 | PNG_INTERNAL_FUNCTION(void,png_write_zTXt,(png_structrp png_ptr, png_const_charp key, |
| 932 | png_const_charp text, png_size_t text_len, int compression),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 933 | #endif |
| 934 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 935 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 936 | PNG_INTERNAL_FUNCTION(void,png_write_iTXt,(png_structrp png_ptr, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 937 | int compression, png_const_charp key, png_const_charp lang, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 938 | png_const_charp lang_key, png_const_charp text),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 939 | #endif |
| 940 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 941 | #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 942 | PNG_INTERNAL_FUNCTION(int,png_set_text_2,(png_const_structrp png_ptr, |
| 943 | png_inforp info_ptr, png_const_textp text_ptr, int num_text),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 944 | #endif |
| 945 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 946 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 947 | PNG_INTERNAL_FUNCTION(void,png_write_oFFs,(png_structrp png_ptr, |
| 948 | png_int_32 x_offset, png_int_32 y_offset, int unit_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 949 | #endif |
| 950 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 951 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 952 | PNG_INTERNAL_FUNCTION(void,png_write_pCAL,(png_structrp png_ptr, png_charp purpose, |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 953 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 954 | png_const_charp units, png_charpp params),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 955 | #endif |
| 956 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 957 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 958 | PNG_INTERNAL_FUNCTION(void,png_write_pHYs,(png_structrp png_ptr, |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 959 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 960 | int unit_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 961 | #endif |
| 962 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 963 | #ifdef PNG_WRITE_tIME_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 964 | PNG_INTERNAL_FUNCTION(void,png_write_tIME,(png_structrp png_ptr, |
| 965 | png_const_timep mod_time),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 966 | #endif |
| 967 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 968 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 969 | PNG_INTERNAL_FUNCTION(void,png_write_sCAL_s,(png_structrp png_ptr, |
| 970 | int unit, png_const_charp width, png_const_charp height),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 971 | #endif |
| 972 | |
| 973 | /* Called when finished processing a row of data */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 974 | PNG_INTERNAL_FUNCTION(void,png_write_finish_row,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 975 | |
| 976 | /* Internal use only. Called before first row of data */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 977 | PNG_INTERNAL_FUNCTION(void,png_write_start_row,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 978 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 979 | /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 980 | * array of png_ptr->width pixels. If the image is not interlaced or this |
| 981 | * is the final pass this just does a png_memcpy, otherwise the "display" flag |
| 982 | * is used to determine whether to copy pixels that are not in the current pass. |
| 983 | * |
| 984 | * Because 'png_do_read_interlace' (below) replicates pixels this allows this |
| 985 | * function to achieve the documented 'blocky' appearance during interlaced read |
| 986 | * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' |
| 987 | * are not changed if they are not in the current pass, when display is 0. |
| 988 | * |
| 989 | * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. |
| 990 | * |
| 991 | * The API always reads from the png_struct row buffer and always assumes that |
| 992 | * it is full width (png_do_read_interlace has already been called.) |
| 993 | * |
| 994 | * This function is only ever used to write to row buffers provided by the |
| 995 | * caller of the relevant libpng API and the row must have already been |
| 996 | * transformed by the read transformations. |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 997 | * |
| 998 | * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed |
| 999 | * bitmasks for use within the code, otherwise runtime generated masks are used. |
| 1000 | * The default is compile time masks. |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1001 | */ |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 1002 | #ifndef PNG_USE_COMPILE_TIME_MASKS |
| 1003 | # define PNG_USE_COMPILE_TIME_MASKS 1 |
| 1004 | #endif |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1005 | PNG_INTERNAL_FUNCTION(void,png_combine_row,(png_const_structrp png_ptr, |
| 1006 | png_bytep row, int display),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1007 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1008 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | 65c0339 | 2011-10-06 21:54:17 -0500 | [diff] [blame] | 1009 | /* Expand an interlaced row: the 'row_info' describes the pass data that has |
| 1010 | * been read in and must correspond to the pixels in 'row', the pixels are |
| 1011 | * expanded (moved apart) in 'row' to match the final layout, when doing this |
| 1012 | * the pixels are *replicated* to the intervening space. This is essential for |
| 1013 | * the correct operation of png_combine_row, above. |
| 1014 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1015 | PNG_INTERNAL_FUNCTION(void,png_do_read_interlace,(png_row_infop row_info, |
| 1016 | png_bytep row, int pass, png_uint_32 transformations),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1017 | #endif |
| 1018 | |
| 1019 | /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
| 1020 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1021 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1022 | /* Grab pixels out of a row for an interlaced pass */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1023 | PNG_INTERNAL_FUNCTION(void,png_do_write_interlace,(png_row_infop row_info, |
| 1024 | png_bytep row, int pass),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1025 | #endif |
| 1026 | |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1027 | /* Unfilter a row: check the filter value before calling this, there is no point |
| 1028 | * calling it for PNG_FILTER_VALUE_NONE. |
| 1029 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1030 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row,(png_structrp pp, png_row_infop row_info, |
| 1031 | png_bytep row, png_const_bytep prev_row, int filter),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1032 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1033 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_up_neon,(png_row_infop row_info, |
| 1034 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1035 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub3_neon,(png_row_infop row_info, |
| 1036 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1037 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_sub4_neon,(png_row_infop row_info, |
| 1038 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1039 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg3_neon,(png_row_infop row_info, |
| 1040 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1041 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_avg4_neon,(png_row_infop row_info, |
| 1042 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1043 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth3_neon,(png_row_infop row_info, |
| 1044 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
| 1045 | PNG_INTERNAL_FUNCTION(void,png_read_filter_row_paeth4_neon,(png_row_infop row_info, |
| 1046 | png_bytep row, png_const_bytep prev_row),PNG_EMPTY); |
Mans Rullgard | d3a9480 | 2011-11-03 00:47:55 -0500 | [diff] [blame] | 1047 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1048 | /* Choose the best filter to use and filter the row data */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1049 | PNG_INTERNAL_FUNCTION(void,png_write_find_filter,(png_structrp png_ptr, |
| 1050 | png_row_infop row_info),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1051 | |
John Bowler | b5d0051 | 2012-03-09 09:15:18 -0600 | [diff] [blame] | 1052 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| 1053 | PNG_INTERNAL_FUNCTION(void,png_read_IDAT_data,(png_structrp png_ptr, |
| 1054 | png_bytep output, png_alloc_size_t avail_out),PNG_EMPTY); |
| 1055 | /* Read 'avail_out' bytes of data from the IDAT stream. If the output buffer |
| 1056 | * is NULL the function checks, instead, for the end of the stream. In this |
| 1057 | * case a benign error will be issued if the stream end is not found or if |
| 1058 | * extra data has to be consumed. |
| 1059 | */ |
| 1060 | PNG_INTERNAL_FUNCTION(void,png_read_finish_IDAT,(png_structrp png_ptr), |
| 1061 | PNG_EMPTY); |
| 1062 | /* This cleans up when the IDAT LZ stream does not end when the last image |
| 1063 | * byte is read; there is still some pending input. |
| 1064 | */ |
| 1065 | |
| 1066 | PNG_INTERNAL_FUNCTION(void,png_read_finish_row,(png_structrp png_ptr), |
| 1067 | PNG_EMPTY); |
| 1068 | /* Finish a row while reading, dealing with interlacing passes, etc. */ |
| 1069 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1070 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1071 | /* Initialize the row buffers, etc. */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1072 | PNG_INTERNAL_FUNCTION(void,png_read_start_row,(png_structrp png_ptr),PNG_EMPTY); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1073 | |
| 1074 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1075 | /* Optional call to update the users info structure */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1076 | PNG_INTERNAL_FUNCTION(void,png_read_transform_info,(png_structrp png_ptr, |
| 1077 | png_inforp info_ptr),PNG_EMPTY); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1078 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1079 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1080 | /* These are the functions that do the transformations */ |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1081 | #ifdef PNG_READ_FILLER_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1082 | PNG_INTERNAL_FUNCTION(void,png_do_read_filler,(png_row_infop row_info, |
| 1083 | png_bytep row, png_uint_32 filler, png_uint_32 flags),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1084 | #endif |
| 1085 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1086 | #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1087 | PNG_INTERNAL_FUNCTION(void,png_do_read_swap_alpha,(png_row_infop row_info, |
| 1088 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1089 | #endif |
| 1090 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1091 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1092 | PNG_INTERNAL_FUNCTION(void,png_do_write_swap_alpha,(png_row_infop row_info, |
| 1093 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1094 | #endif |
| 1095 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1096 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1097 | PNG_INTERNAL_FUNCTION(void,png_do_read_invert_alpha,(png_row_infop row_info, |
| 1098 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1099 | #endif |
| 1100 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1101 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1102 | PNG_INTERNAL_FUNCTION(void,png_do_write_invert_alpha,(png_row_infop row_info, |
| 1103 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1104 | #endif |
| 1105 | |
| 1106 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 1107 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1108 | PNG_INTERNAL_FUNCTION(void,png_do_strip_channel,(png_row_infop row_info, |
| 1109 | png_bytep row, int at_start),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1110 | #endif |
| 1111 | |
Glenn Randers-Pehrson | 39515c9 | 2010-08-28 06:21:35 -0500 | [diff] [blame] | 1112 | #ifdef PNG_16BIT_SUPPORTED |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1113 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1114 | PNG_INTERNAL_FUNCTION(void,png_do_swap,(png_row_infop row_info, |
| 1115 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1116 | #endif |
Glenn Randers-Pehrson | 39515c9 | 2010-08-28 06:21:35 -0500 | [diff] [blame] | 1117 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1118 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 1119 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| 1120 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1121 | PNG_INTERNAL_FUNCTION(void,png_do_packswap,(png_row_infop row_info, |
| 1122 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1123 | #endif |
| 1124 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1125 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1126 | PNG_INTERNAL_FUNCTION(int,png_do_rgb_to_gray,(png_structrp png_ptr, |
| 1127 | png_row_infop row_info, png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1128 | #endif |
| 1129 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1130 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1131 | PNG_INTERNAL_FUNCTION(void,png_do_gray_to_rgb,(png_row_infop row_info, |
| 1132 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1133 | #endif |
| 1134 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1135 | #ifdef PNG_READ_PACK_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1136 | PNG_INTERNAL_FUNCTION(void,png_do_unpack,(png_row_infop row_info, |
| 1137 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1138 | #endif |
| 1139 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1140 | #ifdef PNG_READ_SHIFT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1141 | PNG_INTERNAL_FUNCTION(void,png_do_unshift,(png_row_infop row_info, |
| 1142 | png_bytep row, png_const_color_8p sig_bits),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1143 | #endif |
| 1144 | |
| 1145 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1146 | PNG_INTERNAL_FUNCTION(void,png_do_invert,(png_row_infop row_info, |
| 1147 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1148 | #endif |
| 1149 | |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1150 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1151 | PNG_INTERNAL_FUNCTION(void,png_do_scale_16_to_8,(png_row_infop row_info, |
| 1152 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 5f0b927 | 2011-06-16 09:05:40 -0500 | [diff] [blame] | 1153 | #endif |
John Bowler | 550bab0 | 2011-06-14 06:17:26 -0500 | [diff] [blame] | 1154 | |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame] | 1155 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1156 | PNG_INTERNAL_FUNCTION(void,png_do_chop,(png_row_infop row_info, |
| 1157 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 2232baa | 2011-06-14 06:59:46 -0500 | [diff] [blame] | 1158 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1159 | |
Glenn Randers-Pehrson | 3cd7cff | 2010-04-16 19:27:08 -0500 | [diff] [blame] | 1160 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1161 | PNG_INTERNAL_FUNCTION(void,png_do_quantize,(png_row_infop row_info, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1162 | png_bytep row, png_const_bytep palette_lookup, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1163 | png_const_bytep quantize_lookup),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1164 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1165 | # ifdef PNG_CORRECT_PALETTE_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1166 | PNG_INTERNAL_FUNCTION(void,png_correct_palette,(png_structrp png_ptr, |
| 1167 | png_colorp palette, int num_palette),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1168 | # endif |
| 1169 | #endif |
| 1170 | |
| 1171 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1172 | PNG_INTERNAL_FUNCTION(void,png_do_bgr,(png_row_infop row_info, |
| 1173 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1174 | #endif |
| 1175 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1176 | #ifdef PNG_WRITE_PACK_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1177 | PNG_INTERNAL_FUNCTION(void,png_do_pack,(png_row_infop row_info, |
| 1178 | png_bytep row, png_uint_32 bit_depth),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1179 | #endif |
| 1180 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1181 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1182 | PNG_INTERNAL_FUNCTION(void,png_do_shift,(png_row_infop row_info, |
| 1183 | png_bytep row, png_const_color_8p bit_depth),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1184 | #endif |
| 1185 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1186 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
| 1187 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1188 | PNG_INTERNAL_FUNCTION(void,png_do_compose,(png_row_infop row_info, |
| 1189 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1190 | #endif |
| 1191 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1192 | #ifdef PNG_READ_GAMMA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1193 | PNG_INTERNAL_FUNCTION(void,png_do_gamma,(png_row_infop row_info, |
| 1194 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1195 | #endif |
| 1196 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1197 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1198 | PNG_INTERNAL_FUNCTION(void,png_do_encode_alpha,(png_row_infop row_info, |
| 1199 | png_bytep row, png_structrp png_ptr),PNG_EMPTY); |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1200 | #endif |
| 1201 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1202 | #ifdef PNG_READ_EXPAND_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1203 | PNG_INTERNAL_FUNCTION(void,png_do_expand_palette,(png_row_infop row_info, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1204 | png_bytep row, png_const_colorp palette, png_const_bytep trans, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1205 | int num_trans),PNG_EMPTY); |
| 1206 | PNG_INTERNAL_FUNCTION(void,png_do_expand,(png_row_infop row_info, |
| 1207 | png_bytep row, png_const_color_16p trans_color),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1208 | #endif |
| 1209 | |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1210 | #ifdef PNG_READ_EXPAND_16_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1211 | PNG_INTERNAL_FUNCTION(void,png_do_expand_16,(png_row_infop row_info, |
| 1212 | png_bytep row),PNG_EMPTY); |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1213 | #endif |
| 1214 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1215 | /* The following decodes the appropriate chunks, and does error correction, |
| 1216 | * then calls the appropriate callback for the chunk if it is valid. |
| 1217 | */ |
| 1218 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1219 | /* Decode the IHDR chunk */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1220 | PNG_INTERNAL_FUNCTION(void,png_handle_IHDR,(png_structrp png_ptr, png_inforp info_ptr, |
| 1221 | png_uint_32 length),PNG_EMPTY); |
| 1222 | PNG_INTERNAL_FUNCTION(void,png_handle_PLTE,(png_structrp png_ptr, png_inforp info_ptr, |
| 1223 | png_uint_32 length),PNG_EMPTY); |
| 1224 | PNG_INTERNAL_FUNCTION(void,png_handle_IEND,(png_structrp png_ptr, png_inforp info_ptr, |
| 1225 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1226 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1227 | #ifdef PNG_READ_bKGD_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1228 | PNG_INTERNAL_FUNCTION(void,png_handle_bKGD,(png_structrp png_ptr, png_inforp info_ptr, |
| 1229 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1230 | #endif |
| 1231 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1232 | #ifdef PNG_READ_cHRM_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1233 | PNG_INTERNAL_FUNCTION(void,png_handle_cHRM,(png_structrp png_ptr, png_inforp info_ptr, |
| 1234 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1235 | #endif |
| 1236 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1237 | #ifdef PNG_READ_gAMA_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1238 | PNG_INTERNAL_FUNCTION(void,png_handle_gAMA,(png_structrp png_ptr, png_inforp info_ptr, |
| 1239 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1240 | #endif |
| 1241 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1242 | #ifdef PNG_READ_hIST_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1243 | PNG_INTERNAL_FUNCTION(void,png_handle_hIST,(png_structrp png_ptr, png_inforp info_ptr, |
| 1244 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1245 | #endif |
| 1246 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1247 | #ifdef PNG_READ_iCCP_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1248 | PNG_INTERNAL_FUNCTION(void,png_handle_iCCP,(png_structrp png_ptr, png_inforp info_ptr, |
| 1249 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1250 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| 1251 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1252 | #ifdef PNG_READ_iTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1253 | PNG_INTERNAL_FUNCTION(void,png_handle_iTXt,(png_structrp png_ptr, png_inforp info_ptr, |
| 1254 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1255 | #endif |
| 1256 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1257 | #ifdef PNG_READ_oFFs_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1258 | PNG_INTERNAL_FUNCTION(void,png_handle_oFFs,(png_structrp png_ptr, png_inforp info_ptr, |
| 1259 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1260 | #endif |
| 1261 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1262 | #ifdef PNG_READ_pCAL_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1263 | PNG_INTERNAL_FUNCTION(void,png_handle_pCAL,(png_structrp png_ptr, png_inforp info_ptr, |
| 1264 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1265 | #endif |
| 1266 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1267 | #ifdef PNG_READ_pHYs_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1268 | PNG_INTERNAL_FUNCTION(void,png_handle_pHYs,(png_structrp png_ptr, png_inforp info_ptr, |
| 1269 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1270 | #endif |
| 1271 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1272 | #ifdef PNG_READ_sBIT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1273 | PNG_INTERNAL_FUNCTION(void,png_handle_sBIT,(png_structrp png_ptr, png_inforp info_ptr, |
| 1274 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1275 | #endif |
| 1276 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1277 | #ifdef PNG_READ_sCAL_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1278 | PNG_INTERNAL_FUNCTION(void,png_handle_sCAL,(png_structrp png_ptr, png_inforp info_ptr, |
| 1279 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1280 | #endif |
| 1281 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1282 | #ifdef PNG_READ_sPLT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1283 | PNG_INTERNAL_FUNCTION(void,png_handle_sPLT,(png_structrp png_ptr, png_inforp info_ptr, |
| 1284 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1285 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| 1286 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1287 | #ifdef PNG_READ_sRGB_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1288 | PNG_INTERNAL_FUNCTION(void,png_handle_sRGB,(png_structrp png_ptr, png_inforp info_ptr, |
| 1289 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1290 | #endif |
| 1291 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1292 | #ifdef PNG_READ_tEXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1293 | PNG_INTERNAL_FUNCTION(void,png_handle_tEXt,(png_structrp png_ptr, png_inforp info_ptr, |
| 1294 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1295 | #endif |
| 1296 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1297 | #ifdef PNG_READ_tIME_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1298 | PNG_INTERNAL_FUNCTION(void,png_handle_tIME,(png_structrp png_ptr, png_inforp info_ptr, |
| 1299 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1300 | #endif |
| 1301 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1302 | #ifdef PNG_READ_tRNS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1303 | PNG_INTERNAL_FUNCTION(void,png_handle_tRNS,(png_structrp png_ptr, png_inforp info_ptr, |
| 1304 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1305 | #endif |
| 1306 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1307 | #ifdef PNG_READ_zTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1308 | PNG_INTERNAL_FUNCTION(void,png_handle_zTXt,(png_structrp png_ptr, png_inforp info_ptr, |
| 1309 | png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1310 | #endif |
| 1311 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1312 | PNG_INTERNAL_FUNCTION(void,png_handle_unknown,(png_structrp png_ptr, |
| 1313 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1314 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1315 | PNG_INTERNAL_FUNCTION(void,png_check_chunk_name,(png_structrp png_ptr, |
| 1316 | png_uint_32 chunk_name),PNG_EMPTY); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1317 | |
| 1318 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 1319 | /* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk |
| 1320 | * name, not a string. |
| 1321 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1322 | PNG_INTERNAL_FUNCTION(int,png_chunk_unknown_handling,(png_structrp png_ptr, |
| 1323 | png_uint_32 chunk_name),PNG_EMPTY); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 1324 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1325 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1326 | /* Handle the transformations for reading and writing */ |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1327 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1328 | PNG_INTERNAL_FUNCTION(void,png_do_read_transformations,(png_structrp png_ptr, |
| 1329 | png_row_infop row_info),PNG_EMPTY); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1330 | #endif |
| 1331 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1332 | PNG_INTERNAL_FUNCTION(void,png_do_write_transformations,(png_structrp png_ptr, |
| 1333 | png_row_infop row_info),PNG_EMPTY); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1334 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1335 | |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1336 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1337 | PNG_INTERNAL_FUNCTION(void,png_init_read_transformations,(png_structrp png_ptr),PNG_EMPTY); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1338 | #endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1339 | |
| 1340 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1341 | PNG_INTERNAL_FUNCTION(void,png_push_read_chunk,(png_structrp png_ptr, |
| 1342 | png_inforp info_ptr),PNG_EMPTY); |
| 1343 | PNG_INTERNAL_FUNCTION(void,png_push_read_sig,(png_structrp png_ptr, |
| 1344 | png_inforp info_ptr),PNG_EMPTY); |
| 1345 | PNG_INTERNAL_FUNCTION(void,png_push_check_crc,(png_structrp png_ptr),PNG_EMPTY); |
| 1346 | PNG_INTERNAL_FUNCTION(void,png_push_crc_skip,(png_structrp png_ptr, |
| 1347 | png_uint_32 length),PNG_EMPTY); |
| 1348 | PNG_INTERNAL_FUNCTION(void,png_push_crc_finish,(png_structrp png_ptr),PNG_EMPTY); |
| 1349 | PNG_INTERNAL_FUNCTION(void,png_push_save_buffer,(png_structrp png_ptr),PNG_EMPTY); |
| 1350 | PNG_INTERNAL_FUNCTION(void,png_push_restore_buffer,(png_structrp png_ptr, |
| 1351 | png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); |
| 1352 | PNG_INTERNAL_FUNCTION(void,png_push_read_IDAT,(png_structrp png_ptr),PNG_EMPTY); |
| 1353 | PNG_INTERNAL_FUNCTION(void,png_process_IDAT_data,(png_structrp png_ptr, |
| 1354 | png_bytep buffer, png_size_t buffer_length),PNG_EMPTY); |
| 1355 | PNG_INTERNAL_FUNCTION(void,png_push_process_row,(png_structrp png_ptr),PNG_EMPTY); |
| 1356 | PNG_INTERNAL_FUNCTION(void,png_push_handle_unknown,(png_structrp png_ptr, |
| 1357 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
| 1358 | PNG_INTERNAL_FUNCTION(void,png_push_have_info,(png_structrp png_ptr, |
| 1359 | png_inforp info_ptr),PNG_EMPTY); |
| 1360 | PNG_INTERNAL_FUNCTION(void,png_push_have_end,(png_structrp png_ptr, |
| 1361 | png_inforp info_ptr),PNG_EMPTY); |
| 1362 | PNG_INTERNAL_FUNCTION(void,png_push_have_row,(png_structrp png_ptr, png_bytep row),PNG_EMPTY); |
| 1363 | PNG_INTERNAL_FUNCTION(void,png_push_read_end,(png_structrp png_ptr, |
| 1364 | png_inforp info_ptr),PNG_EMPTY); |
| 1365 | PNG_INTERNAL_FUNCTION(void,png_process_some_data,(png_structrp png_ptr, |
| 1366 | png_inforp info_ptr),PNG_EMPTY); |
| 1367 | PNG_INTERNAL_FUNCTION(void,png_read_push_finish_row,(png_structrp png_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1368 | # ifdef PNG_READ_tEXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1369 | PNG_INTERNAL_FUNCTION(void,png_push_handle_tEXt,(png_structrp png_ptr, |
| 1370 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
| 1371 | PNG_INTERNAL_FUNCTION(void,png_push_read_tEXt,(png_structrp png_ptr, |
| 1372 | png_inforp info_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1373 | # endif |
| 1374 | # ifdef PNG_READ_zTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1375 | PNG_INTERNAL_FUNCTION(void,png_push_handle_zTXt,(png_structrp png_ptr, |
| 1376 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
| 1377 | PNG_INTERNAL_FUNCTION(void,png_push_read_zTXt,(png_structrp png_ptr, |
| 1378 | png_inforp info_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1379 | # endif |
| 1380 | # ifdef PNG_READ_iTXt_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1381 | PNG_INTERNAL_FUNCTION(void,png_push_handle_iTXt,(png_structrp png_ptr, |
| 1382 | png_inforp info_ptr, png_uint_32 length),PNG_EMPTY); |
| 1383 | PNG_INTERNAL_FUNCTION(void,png_push_read_iTXt,(png_structrp png_ptr, |
| 1384 | png_inforp info_ptr),PNG_EMPTY); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1385 | # endif |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1386 | |
| 1387 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1388 | |
| 1389 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1390 | PNG_INTERNAL_FUNCTION(void,png_do_read_intrapixel,(png_row_infop row_info, |
| 1391 | png_bytep row),PNG_EMPTY); |
| 1392 | PNG_INTERNAL_FUNCTION(void,png_do_write_intrapixel,(png_row_infop row_info, |
| 1393 | png_bytep row),PNG_EMPTY); |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1394 | #endif |
| 1395 | |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1396 | /* Added at libpng version 1.6.0 */ |
| 1397 | #ifdef PNG_GAMMA_SUPPORTED |
| 1398 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_gamma,(png_const_structrp png_ptr, |
| 1399 | png_colorspacerp colorspace, png_fixed_point gAMA, int preferred), |
| 1400 | PNG_EMPTY); |
| 1401 | |
| 1402 | PNG_INTERNAL_FUNCTION(void,png_colorspace_sync_info,(png_const_structrp png_ptr, |
| 1403 | png_inforp info_ptr), PNG_EMPTY); |
| 1404 | /* Synchronize the info 'valid' flags with the colorspace */ |
| 1405 | |
| 1406 | PNG_INTERNAL_FUNCTION(void,png_colorspace_sync,(png_const_structrp png_ptr, |
| 1407 | png_inforp info_ptr), PNG_EMPTY); |
| 1408 | /* Copy the png_struct colorspace to the info_struct and call the above to |
| 1409 | * synchronize the flags. Checks for NULL info_ptr and does nothing. |
| 1410 | */ |
| 1411 | #endif |
| 1412 | |
Glenn Randers-Pehrson | f783101 | 2008-11-13 06:05:13 -0600 | [diff] [blame] | 1413 | /* Added at libpng version 1.4.0 */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1414 | #ifdef PNG_COLORSPACE_SUPPORTED |
| 1415 | /* These internal functions are for maintaining the colorspace structure within |
| 1416 | * a png_info or png_struct (or, indeed, both). |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 1417 | */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1418 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_chromaticities, |
| 1419 | (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_xy *xy, |
| 1420 | int preferred), PNG_EMPTY); |
| 1421 | |
| 1422 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_endpoints, |
| 1423 | (png_const_structrp png_ptr, png_colorspacerp colorspace, const png_XYZ *XYZ, |
| 1424 | int preferred), PNG_EMPTY); |
| 1425 | |
| 1426 | #ifdef PNG_sRGB_SUPPORTED |
| 1427 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_sRGB,(png_const_structrp png_ptr, |
| 1428 | png_colorspacerp colorspace, int intent, int preferred), PNG_EMPTY); |
| 1429 | #endif /* sRGB */ |
| 1430 | |
| 1431 | #ifdef PNG_iCCP_SUPPORTED |
| 1432 | PNG_INTERNAL_FUNCTION(int,png_colorspace_set_ICC,(png_const_structrp png_ptr, |
| 1433 | png_colorspacerp colorspace, png_const_charp name, |
| 1434 | png_uint_32 profile_length, png_const_bytep profile, int preferred), |
| 1435 | PNG_EMPTY); |
| 1436 | /* The 'name' is used for information only */ |
| 1437 | |
| 1438 | /* Routines for checking parts of an ICC profile. */ |
| 1439 | PNG_INTERNAL_FUNCTION(int,png_icc_check_length,(png_const_structrp png_ptr, |
| 1440 | png_colorspacerp colorspace, png_const_charp name, |
| 1441 | png_uint_32 profile_length), PNG_EMPTY); |
| 1442 | PNG_INTERNAL_FUNCTION(int,png_icc_check_header,(png_const_structrp png_ptr, |
| 1443 | png_colorspacerp colorspace, png_const_charp name, |
| 1444 | png_uint_32 profile_length, |
| 1445 | png_const_bytep profile /* first 132 bytes only */), PNG_EMPTY); |
| 1446 | PNG_INTERNAL_FUNCTION(int,png_icc_check_tag_table,(png_const_structrp png_ptr, |
| 1447 | png_colorspacerp colorspace, png_const_charp name, |
| 1448 | png_uint_32 profile_length, |
| 1449 | png_const_bytep profile /* header plus whole tag table */), PNG_EMPTY); |
John Bowler | 921648a | 2012-03-28 23:36:12 -0500 | [diff] [blame] | 1450 | PNG_INTERNAL_FUNCTION(int,png_icc_set_gAMA_and_cHRM,( |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1451 | png_const_structrp png_ptr, png_colorspacerp colorspace, |
John Bowler | 921648a | 2012-03-28 23:36:12 -0500 | [diff] [blame] | 1452 | png_const_charp name, png_const_bytep profile, uLong adler, int preferred), |
| 1453 | PNG_EMPTY); |
| 1454 | /* 'adler' is the Adler32 checksum of the uncompressed profile data, it may |
| 1455 | * be 0 to indicate that it is not available. It is used, if provided, as a |
| 1456 | * fast check on the profile when checking to see if it is sRGB. |
| 1457 | */ |
John Bowler | b11b31a | 2012-03-21 07:55:46 -0500 | [diff] [blame] | 1458 | #endif /* iCCP */ |
| 1459 | |
| 1460 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| 1461 | PNG_INTERNAL_FUNCTION(void,png_colorspace_set_rgb_coefficients, |
| 1462 | (png_structrp png_ptr), PNG_EMPTY); |
| 1463 | /* Set the rgb_to_gray coefficients from the colorspace Y values */ |
| 1464 | #endif /* READ_RGB_TO_GRAY */ |
| 1465 | #endif /* COLORSPACE */ |
John Bowler | 9b979b1 | 2011-08-16 22:58:33 -0500 | [diff] [blame] | 1466 | |
Glenn Randers-Pehrson | 134bbe4 | 2009-09-24 18:10:49 -0500 | [diff] [blame] | 1467 | /* Added at libpng version 1.4.0 */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1468 | PNG_INTERNAL_FUNCTION(void,png_check_IHDR,(png_const_structrp png_ptr, |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 1469 | png_uint_32 width, png_uint_32 height, int bit_depth, |
| 1470 | int color_type, int interlace_type, int compression_type, |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1471 | int filter_type),PNG_EMPTY); |
Glenn Randers-Pehrson | 134bbe4 | 2009-09-24 18:10:49 -0500 | [diff] [blame] | 1472 | |
Glenn Randers-Pehrson | eeb1bb6 | 2012-03-02 22:10:15 -0600 | [diff] [blame] | 1473 | /* Added at libpng version 1.5.10 */ |
| 1474 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \ |
| 1475 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED) |
| 1476 | PNG_INTERNAL_FUNCTION(void,png_do_check_palette_indexes, |
| 1477 | (png_structrp png_ptr, png_row_infop row_info),PNG_EMPTY); |
| 1478 | #endif |
| 1479 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1480 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1481 | PNG_INTERNAL_FUNCTION(void,png_fixed_error,(png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 77396b6 | 2010-08-02 08:00:10 -0500 | [diff] [blame] | 1482 | png_const_charp name),PNG_NORETURN); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1483 | #endif |
| 1484 | |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1485 | /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite |
| 1486 | * the end. Always leaves the buffer nul terminated. Never errors out (and |
| 1487 | * there is no error code.) |
| 1488 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1489 | PNG_INTERNAL_FUNCTION(size_t,png_safecat,(png_charp buffer, size_t bufsize, |
| 1490 | size_t pos, png_const_charp string),PNG_EMPTY); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1491 | |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 1492 | /* Various internal functions to handle formatted warning messages, currently |
| 1493 | * only implemented for warnings. |
| 1494 | */ |
| 1495 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1496 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
| 1497 | * and end pointer (which should point just *beyond* the end of the buffer!) |
| 1498 | * Returns the pointer to the start of the formatted string. This utility only |
| 1499 | * does unsigned values. |
| 1500 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1501 | PNG_INTERNAL_FUNCTION(png_charp,png_format_number,(png_const_charp start, |
| 1502 | png_charp end, int format, png_alloc_size_t number),PNG_EMPTY); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1503 | |
| 1504 | /* Convenience macro that takes an array: */ |
| 1505 | #define PNG_FORMAT_NUMBER(buffer,format,number) \ |
| 1506 | png_format_number(buffer, buffer + (sizeof buffer), format, number) |
| 1507 | |
| 1508 | /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ |
| 1509 | #define PNG_NUMBER_BUFFER_SIZE 24 |
| 1510 | |
| 1511 | /* These are the integer formats currently supported, the name is formed from |
| 1512 | * the standard printf(3) format string. |
| 1513 | */ |
| 1514 | #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ |
| 1515 | #define PNG_NUMBER_FORMAT_02u 2 |
| 1516 | #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ |
| 1517 | #define PNG_NUMBER_FORMAT_02d 2 |
| 1518 | #define PNG_NUMBER_FORMAT_x 3 |
| 1519 | #define PNG_NUMBER_FORMAT_02x 4 |
| 1520 | #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ |
| 1521 | #endif |
| 1522 | |
| 1523 | #ifdef PNG_WARNINGS_SUPPORTED |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 1524 | /* New defines and members adding in libpng-1.5.4 */ |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1525 | # define PNG_WARNING_PARAMETER_SIZE 32 |
John Bowler | 00c6a9a | 2012-01-14 19:44:43 -0600 | [diff] [blame] | 1526 | # define PNG_WARNING_PARAMETER_COUNT 8 /* Maximum 9; see pngerror.c */ |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1527 | |
| 1528 | /* An l-value of this type has to be passed to the APIs below to cache the |
| 1529 | * values of the parameters to a formatted warning message. |
| 1530 | */ |
| 1531 | typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ |
| 1532 | PNG_WARNING_PARAMETER_SIZE]; |
| 1533 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1534 | PNG_INTERNAL_FUNCTION(void,png_warning_parameter,(png_warning_parameters p, |
| 1535 | int number, png_const_charp string),PNG_EMPTY); |
| 1536 | /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, |
| 1537 | * including the trailing '\0'. |
| 1538 | */ |
| 1539 | PNG_INTERNAL_FUNCTION(void,png_warning_parameter_unsigned, |
| 1540 | (png_warning_parameters p, int number, int format, png_alloc_size_t value), |
| 1541 | PNG_EMPTY); |
| 1542 | /* Use png_alloc_size_t because it is an unsigned type as big as any we |
| 1543 | * need to output. Use the following for a signed value. |
| 1544 | */ |
| 1545 | PNG_INTERNAL_FUNCTION(void,png_warning_parameter_signed, |
| 1546 | (png_warning_parameters p, int number, int format, png_int_32 value), |
| 1547 | PNG_EMPTY); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1548 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1549 | PNG_INTERNAL_FUNCTION(void,png_formatted_warning,(png_const_structrp png_ptr, |
| 1550 | png_warning_parameters p, png_const_charp message),PNG_EMPTY); |
| 1551 | /* 'message' follows the X/Open approach of using @1, @2 to insert |
| 1552 | * parameters previously supplied using the above functions. Errors in |
| 1553 | * specifying the parameters will simple result in garbage substitutions. |
| 1554 | */ |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1555 | #endif |
| 1556 | |
John Bowler | 2bc76ff | 2012-03-18 22:37:25 -0500 | [diff] [blame] | 1557 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 1558 | /* Application errors (new in 1.6); use these functions (declared below) for |
| 1559 | * errors in the parameters or order of API function calls on read. The |
| 1560 | * 'warning' should be used for an error that can be handled completely, the |
| 1561 | * 'error' for one which can be handled safely but which may lose application |
| 1562 | * information or settings. |
| 1563 | * |
| 1564 | * By default these both result in a png_error call prior to release, while in a |
| 1565 | * released version the 'warning' is just a warning. However if the application |
| 1566 | * explicitly disables benign errors (explicitly permitting the code to lose |
| 1567 | * information) they both turn into warnings. |
| 1568 | * |
| 1569 | * If benign errors aren't supported they end up as the corresponding base call |
| 1570 | * (png_warning or png_error.) |
| 1571 | */ |
| 1572 | PNG_INTERNAL_FUNCTION(void,png_app_warning,(png_const_structrp png_ptr, |
| 1573 | png_const_charp message),PNG_EMPTY); |
| 1574 | /* The application provided invalid parameters to an API function or called |
| 1575 | * an API function at the wrong time, libpng can completely recovered. |
| 1576 | */ |
| 1577 | |
| 1578 | PNG_INTERNAL_FUNCTION(void,png_app_error,(png_const_structrp png_ptr, |
| 1579 | png_const_charp message),PNG_EMPTY); |
| 1580 | /* As above but libpng will ignore the call, or attempt some other partial |
| 1581 | * recovery from the error. |
| 1582 | */ |
| 1583 | #else |
| 1584 | # define png_app_warning(pp,s) png_warning(pp,s) |
| 1585 | # define png_app_error(pp,s) png_error(pp,s) |
| 1586 | #endif |
| 1587 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1588 | /* ASCII to FP interfaces, currently only implemented if sCAL |
| 1589 | * support is required. |
| 1590 | */ |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 1591 | #if defined(PNG_READ_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1592 | /* MAX_DIGITS is actually the maximum number of characters in an sCAL |
| 1593 | * width or height, derived from the precision (number of significant |
Glenn Randers-Pehrson | 665031e | 2012-01-13 22:03:10 -0600 | [diff] [blame] | 1594 | * digits - a build time settable option) and assumptions about the |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1595 | * maximum ridiculous exponent. |
| 1596 | */ |
| 1597 | #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 1598 | |
| 1599 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1600 | PNG_INTERNAL_FUNCTION(void,png_ascii_from_fp,(png_const_structrp png_ptr, |
| 1601 | png_charp ascii, png_size_t size, double fp, unsigned int precision), |
| 1602 | PNG_EMPTY); |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 1603 | #endif /* FLOATING_POINT */ |
| 1604 | |
| 1605 | #ifdef PNG_FIXED_POINT_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1606 | PNG_INTERNAL_FUNCTION(void,png_ascii_from_fixed,(png_const_structrp png_ptr, |
| 1607 | png_charp ascii, png_size_t size, png_fixed_point fp),PNG_EMPTY); |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 1608 | #endif /* FIXED_POINT */ |
| 1609 | #endif /* READ_sCAL */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1610 | |
| 1611 | #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) |
| 1612 | /* An internal API to validate the format of a floating point number. |
| 1613 | * The result is the index of the next character. If the number is |
| 1614 | * not valid it will be the index of a character in the supposed number. |
| 1615 | * |
| 1616 | * The format of a number is defined in the PNG extensions specification |
| 1617 | * and this API is strictly conformant to that spec, not anyone elses! |
| 1618 | * |
| 1619 | * The format as a regular expression is: |
| 1620 | * |
| 1621 | * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
| 1622 | * |
| 1623 | * or: |
| 1624 | * |
| 1625 | * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
| 1626 | * |
| 1627 | * The complexity is that either integer or fraction must be present and the |
| 1628 | * fraction is permitted to have no digits only if the integer is present. |
| 1629 | * |
| 1630 | * NOTE: The dangling E problem. |
| 1631 | * There is a PNG valid floating point number in the following: |
| 1632 | * |
| 1633 | * PNG floating point numb1.ers are not greedy. |
| 1634 | * |
| 1635 | * Working this out requires *TWO* character lookahead (because of the |
| 1636 | * sign), the parser does not do this - it will fail at the 'r' - this |
| 1637 | * doesn't matter for PNG sCAL chunk values, but it requires more care |
| 1638 | * if the value were ever to be embedded in something more complex. Use |
| 1639 | * ANSI-C strtod if you need the lookahead. |
| 1640 | */ |
| 1641 | /* State table for the parser. */ |
| 1642 | #define PNG_FP_INTEGER 0 /* before or in integer */ |
| 1643 | #define PNG_FP_FRACTION 1 /* before or in fraction */ |
| 1644 | #define PNG_FP_EXPONENT 2 /* before or in exponent */ |
| 1645 | #define PNG_FP_STATE 3 /* mask for the above */ |
| 1646 | #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
| 1647 | #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
| 1648 | #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
| 1649 | #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
| 1650 | #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1651 | |
| 1652 | /* These three values don't affect the parser. They are set but not used. |
| 1653 | */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1654 | #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1655 | #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ |
| 1656 | #define PNG_FP_NONZERO 256 /* A non-zero value */ |
| 1657 | #define PNG_FP_STICKY 448 /* The above three flags */ |
| 1658 | |
| 1659 | /* This is available for the caller to store in 'state' if required. Do not |
| 1660 | * call the parser after setting it (the parser sometimes clears it.) |
| 1661 | */ |
| 1662 | #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1663 | |
| 1664 | /* Result codes for the parser (boolean - true meants ok, false means |
| 1665 | * not ok yet.) |
| 1666 | */ |
| 1667 | #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
| 1668 | #define PNG_FP_OK 1 /* The number is valid */ |
| 1669 | |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1670 | /* Tests on the sticky non-zero and negative flags. To pass these checks |
| 1671 | * the state must also indicate that the whole number is valid - this is |
| 1672 | * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this |
| 1673 | * is equivalent to PNG_FP_OK above.) |
| 1674 | */ |
| 1675 | #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) |
| 1676 | /* NZ_MASK: the string is valid and a non-zero negative value */ |
| 1677 | #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) |
| 1678 | /* Z MASK: the string is valid and a non-zero value. */ |
| 1679 | /* PNG_FP_SAW_DIGIT: the string is valid. */ |
| 1680 | #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) |
| 1681 | #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) |
| 1682 | #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) |
John Bowler | 6f237b6 | 2012-03-02 13:13:15 -0600 | [diff] [blame] | 1683 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1684 | /* The actual parser. This can be called repeatedly, it updates |
| 1685 | * the index into the string and the state variable (which must |
| 1686 | * be initialzed to 0). It returns a result code, as above. There |
| 1687 | * is no point calling the parser any more if it fails to advance to |
| 1688 | * the end of the string - it is stuck on an invalid character (or |
| 1689 | * terminated by '\0'). |
| 1690 | * |
| 1691 | * Note that the pointer will consume an E or even an E+ then leave |
| 1692 | * a 'maybe' state even though a preceding integer.fraction is valid. |
| 1693 | * The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
| 1694 | * a valid number. It's possible to recover from this by calling |
| 1695 | * the parser again (from the start, with state 0) but with a string |
| 1696 | * that omits the last character (i.e. set the size to the index of |
| 1697 | * the problem character.) This has not been tested within libpng. |
| 1698 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1699 | PNG_INTERNAL_FUNCTION(int,png_check_fp_number,(png_const_charp string, |
| 1700 | png_size_t size, int *statep, png_size_tp whereami),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1701 | |
| 1702 | /* This is the same but it checks a complete string and returns true |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1703 | * only if it just contains a floating point number. As of 1.5.4 this |
| 1704 | * function also returns the state at the end of parsing the number if |
| 1705 | * it was valid (otherwise it returns 0.) This can be used for testing |
| 1706 | * for negative or zero values using the sticky flag. |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1707 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1708 | PNG_INTERNAL_FUNCTION(int,png_check_fp_string,(png_const_charp string, |
| 1709 | png_size_t size),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1710 | #endif /* pCAL || sCAL */ |
| 1711 | |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 1712 | #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ |
| 1713 | defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1714 | /* Added at libpng version 1.5.0 */ |
| 1715 | /* This is a utility to provide a*times/div (rounded) and indicate |
| 1716 | * if there is an overflow. The result is a boolean - false (0) |
| 1717 | * for overflow, true (1) if no overflow, in which case *res |
| 1718 | * holds the result. |
| 1719 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1720 | PNG_INTERNAL_FUNCTION(int,png_muldiv,(png_fixed_point_p res, png_fixed_point a, |
| 1721 | png_int_32 multiplied_by, png_int_32 divided_by),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1722 | #endif |
| 1723 | |
| 1724 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
| 1725 | /* Same deal, but issue a warning on overflow and return 0. */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1726 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_muldiv_warn, |
| 1727 | (png_const_structrp png_ptr, png_fixed_point a, png_int_32 multiplied_by, |
| 1728 | png_int_32 divided_by),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1729 | #endif |
| 1730 | |
| 1731 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| 1732 | /* Calculate a reciprocal - used for gamma values. This returns |
| 1733 | * 0 if the argument is 0 in order to maintain an undefined value, |
| 1734 | * there are no warnings. |
| 1735 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1736 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal,(png_fixed_point a), |
| 1737 | PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1738 | |
| 1739 | /* The same but gives a reciprocal of the product of two fixed point |
| 1740 | * values. Accuracy is suitable for gamma calculations but this is |
| 1741 | * not exact - use png_muldiv for that. |
| 1742 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1743 | PNG_INTERNAL_FUNCTION(png_fixed_point,png_reciprocal2,(png_fixed_point a, |
| 1744 | png_fixed_point b),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1745 | #endif |
| 1746 | |
| 1747 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| 1748 | /* Internal fixed point gamma correction. These APIs are called as |
| 1749 | * required to convert single values - they don't need to be fast, |
| 1750 | * they are not used when processing image pixel values. |
| 1751 | * |
| 1752 | * While the input is an 'unsigned' value it must actually be the |
| 1753 | * correct bit value - 0..255 or 0..65535 as required. |
| 1754 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1755 | PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_correct,(png_structrp png_ptr, |
| 1756 | unsigned int value, png_fixed_point gamma_value),PNG_EMPTY); |
| 1757 | PNG_INTERNAL_FUNCTION(int,png_gamma_significant,(png_fixed_point gamma_value), |
| 1758 | PNG_EMPTY); |
| 1759 | PNG_INTERNAL_FUNCTION(png_uint_16,png_gamma_16bit_correct,(unsigned int value, |
| 1760 | png_fixed_point gamma_value),PNG_EMPTY); |
| 1761 | PNG_INTERNAL_FUNCTION(png_byte,png_gamma_8bit_correct,(unsigned int value, |
| 1762 | png_fixed_point gamma_value),PNG_EMPTY); |
| 1763 | PNG_INTERNAL_FUNCTION(void,png_destroy_gamma_table,(png_structrp png_ptr), |
| 1764 | PNG_EMPTY); |
| 1765 | PNG_INTERNAL_FUNCTION(void,png_build_gamma_table,(png_structrp png_ptr, |
| 1766 | int bit_depth),PNG_EMPTY); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1767 | #endif |
Glenn Randers-Pehrson | d29033f | 2009-11-07 10:46:42 -0600 | [diff] [blame] | 1768 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1769 | /* SIMPLIFIED READ/WRITE SUPPORT */ |
| 1770 | #if defined PNG_SIMPLIFIED_READ_SUPPORTED ||\ |
| 1771 | defined PNG_SIMPLIFIED_WRITE_SUPPORTED |
| 1772 | /* The internal structure that png_image::opaque points to. */ |
| 1773 | typedef struct png_control |
| 1774 | { |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 1775 | png_structp png_ptr; |
| 1776 | png_infop info_ptr; |
| 1777 | png_voidp error_buf; /* Always a jmp_buf at present. */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1778 | |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 1779 | png_const_bytep memory; /* Memory buffer. */ |
| 1780 | png_size_t size; /* Size of the memory buffer. */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1781 | |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 1782 | unsigned int for_write :1; /* Otherwise it is a read structure */ |
| 1783 | unsigned int owned_file :1; /* We own the file in io_ptr */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1784 | } png_control; |
| 1785 | |
John Bowler | 4fa96a4 | 2011-11-16 16:39:16 -0600 | [diff] [blame] | 1786 | /* Return the pointer to the jmp_buf from a png_control: necessary because C |
| 1787 | * does not reveal the type of the elements of jmp_buf. |
| 1788 | */ |
| 1789 | #ifdef __cplusplus |
| 1790 | # define png_control_jmp_buf(pc) (((jmp_buf*)((pc)->error_buf))[0]) |
| 1791 | #else |
| 1792 | # define png_control_jmp_buf(pc) ((pc)->error_buf) |
| 1793 | #endif |
| 1794 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1795 | /* Utility to safely execute a piece of libpng code catching and logging any |
| 1796 | * errors that might occur. Returns true on success, false on failure (either |
| 1797 | * of the function or as a result of a png_error.) |
| 1798 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1799 | PNG_INTERNAL_FUNCTION(void,png_safe_error,(png_structp png_ptr, |
| 1800 | png_const_charp error_message),PNG_NORETURN); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1801 | |
| 1802 | #ifdef PNG_WARNINGS_SUPPORTED |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1803 | PNG_INTERNAL_FUNCTION(void,png_safe_warning,(png_structp png_ptr, |
| 1804 | png_const_charp warning_message),PNG_EMPTY); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1805 | #else |
| 1806 | # define png_safe_warning 0/*dummy argument*/ |
| 1807 | #endif |
| 1808 | |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1809 | PNG_INTERNAL_FUNCTION(int,png_safe_execute,(png_imagep image, |
| 1810 | int (*function)(png_voidp), png_voidp arg),PNG_EMPTY); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1811 | |
| 1812 | /* Utility to log an error, this also cleans up the png_image, the function |
| 1813 | * always returns 0 (false). |
| 1814 | */ |
John Bowler | 572b078 | 2012-01-31 07:09:34 -0600 | [diff] [blame] | 1815 | PNG_INTERNAL_FUNCTION(int,png_image_error,(png_imagep image, |
| 1816 | png_const_charp error_message),PNG_EMPTY); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1817 | |
| 1818 | #endif /* SIMPLIFIED READ/WRITE */ |
| 1819 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1820 | /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
| 1821 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1822 | #include "pngdebug.h" |
| 1823 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 1824 | #ifdef __cplusplus |
| 1825 | } |
| 1826 | #endif |
| 1827 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1828 | #endif /* PNGPRIV_H */ |