| 1 | ␍␊ |
| 2 | /* pngpriv.h - private declarations for use inside libpng␍␊ |
| 3 | *␍␊ |
| 4 | * For conditions of distribution and use, see copyright notice in png.h␍␊ |
| 5 | * Copyright (c) 1998-2012 Glenn Randers-Pehrson␍␊ |
| 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)␍␊ |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)␍␊ |
| 8 | *␍␊ |
| 9 | * Last changed in libpng 1.5.10 [March 29, 2012]␍␊ |
| 10 | *␍␊ |
| 11 | * This code is released under the libpng license.␍␊ |
| 12 | * For conditions of distribution and use, see the disclaimer␍␊ |
| 13 | * and license in png.h␍␊ |
| 14 | */␍␊ |
| 15 | ␍␊ |
| 16 | /* The symbols declared in this file (including the functions declared␍␊ |
| 17 | * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public␍␊ |
| 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␍␊ |
| 27 | ␍␊ |
| 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 */␍␊ |
| 41 | ␍␊ |
| 42 | /* This is required for the definition of abort(), used as a last ditch␍␊ |
| 43 | * error handler when all else fails.␍␊ |
| 44 | */␍␊ |
| 45 | #include <stdlib.h>␍␊ |
| 46 | #include <string.h>␍␊ |
| 47 | ␍␊ |
| 48 | ␍␊ |
| 49 | /* This is used to find 'offsetof', used below for alignment tests. */␍␊ |
| 50 | #include <stddef.h>␍␊ |
| 51 | ␍␊ |
| 52 | #define PNGLIB_BUILD /*libpng is being built, not used*/␍␊ |
| 53 | ␍␊ |
| 54 | #ifdef PNG_USER_CONFIG␍␊ |
| 55 | # include "pngusr.h"␍␊ |
| 56 | /* These should have been defined in pngusr.h */␍␊ |
| 57 | # ifndef PNG_USER_PRIVATEBUILD␍␊ |
| 58 | # define PNG_USER_PRIVATEBUILD "Custom libpng build"␍␊ |
| 59 | # endif␍␊ |
| 60 | # ifndef PNG_USER_DLLFNAME_POSTFIX␍␊ |
| 61 | # define PNG_USER_DLLFNAME_POSTFIX "Cb"␍␊ |
| 62 | # endif␍␊ |
| 63 | #endif␍␊ |
| 64 | ␍␊ |
| 65 | /* Is this a build of a DLL where compilation of the object modules requires␍␊ |
| 66 | * different preprocessor settings to those required for a simple library? If␍␊ |
| 67 | * so PNG_BUILD_DLL must be set.␍␊ |
| 68 | *␍␊ |
| 69 | * If libpng is used inside a DLL but that DLL does not export the libpng APIs␍␊ |
| 70 | * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a␍␊ |
| 71 | * static library of libpng then link the DLL against that.␍␊ |
| 72 | */␍␊ |
| 73 | #ifndef PNG_BUILD_DLL␍␊ |
| 74 | # ifdef DLL_EXPORT␍␊ |
| 75 | /* This is set by libtool when files are compiled for a DLL; libtool␍␊ |
| 76 | * always compiles twice, even on systems where it isn't necessary. Set␍␊ |
| 77 | * PNG_BUILD_DLL in case it is necessary:␍␊ |
| 78 | */␍␊ |
| 79 | # define PNG_BUILD_DLL␍␊ |
| 80 | # else␍␊ |
| 81 | # ifdef _WINDLL␍␊ |
| 82 | /* This is set by the Microsoft Visual Studio IDE in projects that␍␊ |
| 83 | * build a DLL. It can't easily be removed from those projects (it␍␊ |
| 84 | * isn't visible in the Visual Studio UI) so it is a fairly reliable␍␊ |
| 85 | * indication that PNG_IMPEXP needs to be set to the DLL export␍␊ |
| 86 | * attributes.␍␊ |
| 87 | */␍␊ |
| 88 | # define PNG_BUILD_DLL␍␊ |
| 89 | # else␍␊ |
| 90 | # ifdef __DLL__␍␊ |
| 91 | /* This is set by the Borland C system when compiling for a DLL␍␊ |
| 92 | * (as above.)␍␊ |
| 93 | */␍␊ |
| 94 | # define PNG_BUILD_DLL␍␊ |
| 95 | # else␍␊ |
| 96 | /* Add additional compiler cases here. */␍␊ |
| 97 | # endif␍␊ |
| 98 | # endif␍␊ |
| 99 | # endif␍␊ |
| 100 | #endif /* Setting PNG_BUILD_DLL if required */␍␊ |
| 101 | ␍␊ |
| 102 | /* See pngconf.h for more details: the builder of the library may set this on␍␊ |
| 103 | * the command line to the right thing for the specific compilation system or it␍␊ |
| 104 | * may be automagically set above (at present we know of no system where it does␍␊ |
| 105 | * need to be set on the command line.)␍␊ |
| 106 | *␍␊ |
| 107 | * PNG_IMPEXP must be set here when building the library to prevent pngconf.h␍␊ |
| 108 | * setting it to the "import" setting for a DLL build.␍␊ |
| 109 | */␍␊ |
| 110 | #ifndef PNG_IMPEXP␍␊ |
| 111 | # ifdef PNG_BUILD_DLL␍␊ |
| 112 | # define PNG_IMPEXP PNG_DLL_EXPORT␍␊ |
| 113 | # else␍␊ |
| 114 | /* Not building a DLL, or the DLL doesn't require specific export␍␊ |
| 115 | * definitions.␍␊ |
| 116 | */␍␊ |
| 117 | # define PNG_IMPEXP␍␊ |
| 118 | # endif␍␊ |
| 119 | #endif␍␊ |
| 120 | ␍␊ |
| 121 | /* No warnings for private or deprecated functions in the build: */␍␊ |
| 122 | #ifndef PNG_DEPRECATED␍␊ |
| 123 | # define PNG_DEPRECATED␍␊ |
| 124 | #endif␍␊ |
| 125 | #ifndef PNG_PRIVATE␍␊ |
| 126 | # define PNG_PRIVATE␍␊ |
| 127 | #endif␍␊ |
| 128 | ␍␊ |
| 129 | #include "png.h"␍␊ |
| 130 | #include "pnginfo.h"␍␊ |
| 131 | #include "pngstruct.h"␍␊ |
| 132 | ␍␊ |
| 133 | /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */␍␊ |
| 134 | #ifndef PNG_DLL_EXPORT␍␊ |
| 135 | # define PNG_DLL_EXPORT␍␊ |
| 136 | #endif␍␊ |
| 137 | ␍␊ |
| 138 | /* SECURITY and SAFETY:␍␊ |
| 139 | *␍␊ |
| 140 | * By default libpng is built without any internal limits on image size,␍␊ |
| 141 | * individual heap (png_malloc) allocations or the total amount of memory used.␍␊ |
| 142 | * If PNG_SAFE_LIMITS_SUPPORTED is defined, however, the limits below are used␍␊ |
| 143 | * (unless individually overridden). These limits are believed to be fairly␍␊ |
| 144 | * safe, but builders of secure systems should verify the values against the␍␊ |
| 145 | * real system capabilities.␍␊ |
| 146 | */␍␊ |
| 147 | ␍␊ |
| 148 | #ifdef PNG_SAFE_LIMITS_SUPPORTED␍␊ |
| 149 | /* 'safe' limits */␍␊ |
| 150 | # ifndef PNG_USER_WIDTH_MAX␍␊ |
| 151 | # define PNG_USER_WIDTH_MAX 1000000␍␊ |
| 152 | # endif␍␊ |
| 153 | # ifndef PNG_USER_HEIGHT_MAX␍␊ |
| 154 | # define PNG_USER_HEIGHT_MAX 1000000␍␊ |
| 155 | # endif␍␊ |
| 156 | # ifndef PNG_USER_CHUNK_CACHE_MAX␍␊ |
| 157 | # define PNG_USER_CHUNK_CACHE_MAX 128␍␊ |
| 158 | # endif␍␊ |
| 159 | # ifndef PNG_USER_CHUNK_MALLOC_MAX␍␊ |
| 160 | # define PNG_USER_CHUNK_MALLOC_MAX 8000000␍␊ |
| 161 | # endif␍␊ |
| 162 | #else␍␊ |
| 163 | /* values for no limits */␍␊ |
| 164 | # ifndef PNG_USER_WIDTH_MAX␍␊ |
| 165 | # define PNG_USER_WIDTH_MAX 0x7fffffff␍␊ |
| 166 | # endif␍␊ |
| 167 | # ifndef PNG_USER_HEIGHT_MAX␍␊ |
| 168 | # define PNG_USER_HEIGHT_MAX 0x7fffffff␍␊ |
| 169 | # endif␍␊ |
| 170 | # ifndef PNG_USER_CHUNK_CACHE_MAX␍␊ |
| 171 | # define PNG_USER_CHUNK_CACHE_MAX 0␍␊ |
| 172 | # endif␍␊ |
| 173 | # ifndef PNG_USER_CHUNK_MALLOC_MAX␍␊ |
| 174 | # define PNG_USER_CHUNK_MALLOC_MAX 0␍␊ |
| 175 | # endif␍␊ |
| 176 | #endif␍␊ |
| 177 | ␍␊ |
| 178 | /* This is used for 16 bit gamma tables - only the top level pointers are const,␍␊ |
| 179 | * this could be changed:␍␊ |
| 180 | */␍␊ |
| 181 | typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;␍␊ |
| 182 | ␍␊ |
| 183 | /* Added at libpng-1.2.9 */␍␊ |
| 184 | /* Moved to pngpriv.h at libpng-1.5.0 */␍␊ |
| 185 | ␍␊ |
| 186 | /* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure"␍␊ |
| 187 | * script. We may need it here to get the correct configuration on things␍␊ |
| 188 | * like limits.␍␊ |
| 189 | */␍␊ |
| 190 | #ifdef PNG_CONFIGURE_LIBPNG␍␊ |
| 191 | # ifdef HAVE_CONFIG_H␍␊ |
| 192 | # include "config.h"␍␊ |
| 193 | # endif␍␊ |
| 194 | #endif␍␊ |
| 195 | ␍␊ |
| 196 | /* Moved to pngpriv.h at libpng-1.5.0 */␍␊ |
| 197 | /* NOTE: some of these may have been used in external applications as␍␊ |
| 198 | * these definitions were exposed in pngconf.h prior to 1.5.␍␊ |
| 199 | */␍␊ |
| 200 | ␍␊ |
| 201 | /* If you are running on a machine where you cannot allocate more␍␊ |
| 202 | * than 64K of memory at once, uncomment this. While libpng will not␍␊ |
| 203 | * normally need that much memory in a chunk (unless you load up a very␍␊ |
| 204 | * large file), zlib needs to know how big of a chunk it can use, and␍␊ |
| 205 | * libpng thus makes sure to check any memory allocation to verify it␍␊ |
| 206 | * will fit into memory.␍␊ |
| 207 | *␍␊ |
| 208 | * zlib provides 'MAXSEG_64K' which, if defined, indicates the␍␊ |
| 209 | * same limit and pngconf.h (already included) sets the limit␍␊ |
| 210 | * if certain operating systems are detected.␍␊ |
| 211 | */␍␊ |
| 212 | #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)␍␊ |
| 213 | # define PNG_MAX_MALLOC_64K␍␊ |
| 214 | #endif␍␊ |
| 215 | ␍␊ |
| 216 | #ifndef PNG_UNUSED␍␊ |
| 217 | /* Unused formal parameter warnings are silenced using the following macro␍␊ |
| 218 | * which is expected to have no bad effects on performance (optimizing␍␊ |
| 219 | * compilers will probably remove it entirely). Note that if you replace␍␊ |
| 220 | * it with something other than whitespace, you must include the terminating␍␊ |
| 221 | * semicolon.␍␊ |
| 222 | */␍␊ |
| 223 | # define PNG_UNUSED(param) (void)param;␍␊ |
| 224 | #endif␍␊ |
| 225 | ␍␊ |
| 226 | /* Just a little check that someone hasn't tried to define something␍␊ |
| 227 | * contradictory.␍␊ |
| 228 | */␍␊ |
| 229 | #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)␍␊ |
| 230 | # undef PNG_ZBUF_SIZE␍␊ |
| 231 | # define PNG_ZBUF_SIZE 65536L␍␊ |
| 232 | #endif␍␊ |
| 233 | ␍␊ |
| 234 | /* PNG_STATIC is used to mark internal file scope functions if they need to be␍␊ |
| 235 | * accessed for implementation tests (see the code in tests/?*).␍␊ |
| 236 | */␍␊ |
| 237 | #ifndef PNG_STATIC␍␊ |
| 238 | # define PNG_STATIC static␍␊ |
| 239 | #endif␍␊ |
| 240 | ␍␊ |
| 241 | /* C99 restrict is used where possible, to do this 'restrict' is defined as␍␊ |
| 242 | * empty if we can't be sure it is supported. configure builds have already␍␊ |
| 243 | * done this work.␍␊ |
| 244 | */␍␊ |
| 245 | #ifdef PNG_CONFIGURE_LIBPNG␍␊ |
| 246 | # define PNG_RESTRICT restrict␍␊ |
| 247 | #else␍␊ |
| 248 | /* Modern compilers support restrict, but assume not for anything not␍␊ |
| 249 | * recognized here:␍␊ |
| 250 | */␍␊ |
| 251 | # if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__␍␊ |
| 252 | # define PNG_RESTRICT restrict␍␊ |
| 253 | # else␍␊ |
| 254 | # define PNG_RESTRICT␍␊ |
| 255 | # endif␍␊ |
| 256 | #endif␍␊ |
| 257 | ␍␊ |
| 258 | /* If warnings or errors are turned off the code is disabled or redirected here.␍␊ |
| 259 | * From 1.5.4 functions have been added to allow very limited formatting of␍␊ |
| 260 | * error and warning messages - this code will also be disabled here.␍␊ |
| 261 | */␍␊ |
| 262 | #ifdef PNG_WARNINGS_SUPPORTED␍␊ |
| 263 | # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p;␍␊ |
| 264 | #else␍␊ |
| 265 | # define png_warning(s1,s2) ((void)(s1))␍␊ |
| 266 | # define png_chunk_warning(s1,s2) ((void)(s1))␍␊ |
| 267 | # define png_warning_parameter(p,number,string) ((void)0)␍␊ |
| 268 | # define png_warning_parameter_unsigned(p,number,format,value) ((void)0)␍␊ |
| 269 | # define png_warning_parameter_signed(p,number,format,value) ((void)0)␍␊ |
| 270 | # define png_formatted_warning(pp,p,message) ((void)(pp))␍␊ |
| 271 | # define PNG_WARNING_PARAMETERS(p)␍␊ |
| 272 | #endif␍␊ |
| 273 | #ifndef PNG_ERROR_TEXT_SUPPORTED␍␊ |
| 274 | # define png_error(s1,s2) png_err(s1)␍␊ |
| 275 | # define png_chunk_error(s1,s2) png_err(s1)␍␊ |
| 276 | # define png_fixed_error(s1,s2) png_err(s1)␍␊ |
| 277 | #endif␍␊ |
| 278 | ␍␊ |
| 279 | /* C allows up-casts from (void*) to any pointer and (const void*) to any␍␊ |
| 280 | * pointer to a const object. C++ regards this as a type error and requires an␍␊ |
| 281 | * explicit, static, cast and provides the static_cast<> rune to ensure that␍␊ |
| 282 | * const is not cast away.␍␊ |
| 283 | */␍␊ |
| 284 | #ifdef __cplusplus␍␊ |
| 285 | # define png_voidcast(type, value) static_cast<type>(value)␍␊ |
| 286 | #else␍␊ |
| 287 | # define png_voidcast(type, value) (value)␍␊ |
| 288 | #endif /* __cplusplus */␍␊ |
| 289 | ␍␊ |
| 290 | #ifndef PNG_EXTERN␍␊ |
| 291 | /* The functions exported by PNG_EXTERN are internal functions, which␍␊ |
| 292 | * aren't usually used outside the library (as far as I know), so it is␍␊ |
| 293 | * debatable if they should be exported at all. In the future, when it␍␊ |
| 294 | * is possible to have run-time registry of chunk-handling functions,␍␊ |
| 295 | * some of these might be made available again.␍␊ |
| 296 | *␍␊ |
| 297 | * 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h␍␊ |
| 298 | * it should be safe now (it is unclear why it was turned off.)␍␊ |
| 299 | */␍␊ |
| 300 | # define PNG_EXTERN extern␍␊ |
| 301 | #endif␍␊ |
| 302 | ␍␊ |
| 303 | /* Some fixed point APIs are still required even if not exported because␍␊ |
| 304 | * they get used by the corresponding floating point APIs. This magic␍␊ |
| 305 | * deals with this:␍␊ |
| 306 | */␍␊ |
| 307 | #ifdef PNG_FIXED_POINT_SUPPORTED␍␊ |
| 308 | # define PNGFAPI PNGAPI␍␊ |
| 309 | #else␍␊ |
| 310 | # define PNGFAPI /* PRIVATE */␍␊ |
| 311 | #endif␍␊ |
| 312 | ␍␊ |
| 313 | /* Other defines specific to compilers can go here. Try to keep␍␊ |
| 314 | * them inside an appropriate ifdef/endif pair for portability.␍␊ |
| 315 | */␍␊ |
| 316 | #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\␍␊ |
| 317 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED)␍␊ |
| 318 | /* png.c requires the following ANSI-C constants if the conversion of␍␊ |
| 319 | * floating point to ASCII is implemented therein:␍␊ |
| 320 | *␍␊ |
| 321 | * DBL_DIG Maximum number of decimal digits (can be set to any constant)␍␊ |
| 322 | * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value)␍␊ |
| 323 | * DBL_MAX Maximum floating point number (can be set to an arbitrary value)␍␊ |
| 324 | */␍␊ |
| 325 | # include <float.h>␍␊ |
| 326 | ␍␊ |
| 327 | # if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \␍␊ |
| 328 | defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)␍␊ |
| 329 | /* We need to check that <math.h> hasn't already been included earlier␍␊ |
| 330 | * as it seems it doesn't agree with <fp.h>, yet we should really use␍␊ |
| 331 | * <fp.h> if possible.␍␊ |
| 332 | */␍␊ |
| 333 | # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)␍␊ |
| 334 | # include <fp.h>␍␊ |
| 335 | # endif␍␊ |
| 336 | # else␍␊ |
| 337 | # include <math.h>␍␊ |
| 338 | # endif␍␊ |
| 339 | # if defined(_AMIGA) && defined(__SASC) && defined(_M68881)␍␊ |
| 340 | /* Amiga SAS/C: We must include builtin FPU functions when compiling using␍␊ |
| 341 | * MATH=68881␍␊ |
| 342 | */␍␊ |
| 343 | # include <m68881.h>␍␊ |
| 344 | # endif␍␊ |
| 345 | #endif␍␊ |
| 346 | ␍␊ |
| 347 | /* This provides the non-ANSI (far) memory allocation routines. */␍␊ |
| 348 | #if defined(__TURBOC__) && defined(__MSDOS__)␍␊ |
| 349 | # include <mem.h>␍␊ |
| 350 | # include <alloc.h>␍␊ |
| 351 | #endif␍␊ |
| 352 | ␍␊ |
| 353 | #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \␍␊ |
| 354 | defined(_WIN32) || defined(__WIN32__)␍␊ |
| 355 | # include <windows.h> /* defines _WINDOWS_ macro */␍␊ |
| 356 | #endif␍␊ |
| 357 | ␍␊ |
| 358 | /* Moved here around 1.5.0beta36 from pngconf.h */␍␊ |
| 359 | /* Users may want to use these so they are not private. Any library␍␊ |
| 360 | * functions that are passed far data must be model-independent.␍␊ |
| 361 | */␍␊ |
| 362 | ␍␊ |
| 363 | /* Memory model/platform independent fns */␍␊ |
| 364 | #ifndef PNG_ABORT␍␊ |
| 365 | # ifdef _WINDOWS_␍␊ |
| 366 | # define PNG_ABORT() ExitProcess(0)␍␊ |
| 367 | # else␍␊ |
| 368 | # define PNG_ABORT() abort()␍␊ |
| 369 | # endif␍␊ |
| 370 | #endif␍␊ |
| 371 | ␍␊ |
| 372 | #ifdef USE_FAR_KEYWORD␍␊ |
| 373 | /* Use this to make far-to-near assignments */␍␊ |
| 374 | # define CHECK 1␍␊ |
| 375 | # define NOCHECK 0␍␊ |
| 376 | # define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))␍␊ |
| 377 | # define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))␍␊ |
| 378 | # define png_strlen _fstrlen␍␊ |
| 379 | # define png_memcmp _fmemcmp /* SJT: added */␍␊ |
| 380 | # define png_memcpy _fmemcpy␍␊ |
| 381 | # define png_memset _fmemset␍␊ |
| 382 | #else␍␊ |
| 383 | # ifdef _WINDOWS_ /* Favor Windows over C runtime fns */␍␊ |
| 384 | # define CVT_PTR(ptr) (ptr)␍␊ |
| 385 | # define CVT_PTR_NOCHECK(ptr) (ptr)␍␊ |
| 386 | # define png_strlen lstrlenA␍␊ |
| 387 | # define png_memcmp memcmp␍␊ |
| 388 | # define png_memcpy CopyMemory␍␊ |
| 389 | # define png_memset memset␍␊ |
| 390 | # else␍␊ |
| 391 | # define CVT_PTR(ptr) (ptr)␍␊ |
| 392 | # define CVT_PTR_NOCHECK(ptr) (ptr)␍␊ |
| 393 | # define png_strlen strlen␍␊ |
| 394 | # define png_memcmp memcmp /* SJT: added */␍␊ |
| 395 | # define png_memcpy memcpy␍␊ |
| 396 | # define png_memset memset␍␊ |
| 397 | # endif␍␊ |
| 398 | #endif␍␊ |
| 399 | ␍␊ |
| 400 | /* These macros may need to be architecture dependent. */␍␊ |
| 401 | #define PNG_ALIGN_NONE 0 /* do not use data alignment */␍␊ |
| 402 | #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */␍␊ |
| 403 | #ifdef offsetof␍␊ |
| 404 | # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */␍␊ |
| 405 | #else␍␊ |
| 406 | # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */␍␊ |
| 407 | #endif␍␊ |
| 408 | #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */␍␊ |
| 409 | ␍␊ |
| 410 | #ifndef PNG_ALIGN_TYPE␍␊ |
| 411 | /* Default to using aligned access optimizations and requiring alignment to a␍␊ |
| 412 | * multiple of the data type size. Override in a compiler specific fashion␍␊ |
| 413 | * if necessary by inserting tests here:␍␊ |
| 414 | */␍␊ |
| 415 | # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE␍␊ |
| 416 | #endif␍␊ |
| 417 | ␍␊ |
| 418 | #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE␍␊ |
| 419 | /* This is used because in some compiler implementations non-aligned␍␊ |
| 420 | * structure members are supported, so the offsetof approach below fails.␍␊ |
| 421 | * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access␍␊ |
| 422 | * is good for performance. Do not do this unless you have tested the result␍␊ |
| 423 | * and understand it.␍␊ |
| 424 | */␍␊ |
| 425 | # define png_alignof(type) (sizeof (type))␍␊ |
| 426 | #else␍␊ |
| 427 | # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET␍␊ |
| 428 | # define png_alignof(type) offsetof(struct{char c; type t;}, t)␍␊ |
| 429 | # else␍␊ |
| 430 | # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS␍␊ |
| 431 | # define png_alignof(type) (1)␍␊ |
| 432 | # endif␍␊ |
| 433 | /* Else leave png_alignof undefined to prevent use thereof */␍␊ |
| 434 | # endif␍␊ |
| 435 | #endif␍␊ |
| 436 | ␍␊ |
| 437 | /* This implicitly assumes alignment is always to a power of 2. */␍␊ |
| 438 | #ifdef png_alignof␍␊ |
| 439 | # define png_isaligned(ptr, type)\␍␊ |
| 440 | ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0)␍␊ |
| 441 | #else␍␊ |
| 442 | # define png_isaligned(ptr, type) 0␍␊ |
| 443 | #endif␍␊ |
| 444 | ␍␊ |
| 445 | /* End of memory model/platform independent support */␍␊ |
| 446 | /* End of 1.5.0beta36 move from pngconf.h */␍␊ |
| 447 | ␍␊ |
| 448 | /* CONSTANTS and UTILITY MACROS␍␊ |
| 449 | * These are used internally by libpng and not exposed in the API␍␊ |
| 450 | */␍␊ |
| 451 | ␍␊ |
| 452 | /* Various modes of operation. Note that after an init, mode is set to␍␊ |
| 453 | * zero automatically when the structure is created. Three of these␍␊ |
| 454 | * are defined in png.h because they need to be visible to applications␍␊ |
| 455 | * that call png_set_unknown_chunk().␍␊ |
| 456 | */␍␊ |
| 457 | /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */␍␊ |
| 458 | /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */␍␊ |
| 459 | #define PNG_HAVE_IDAT 0x04␍␊ |
| 460 | /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */␍␊ |
| 461 | #define PNG_HAVE_IEND 0x10␍␊ |
| 462 | #define PNG_HAVE_gAMA 0x20␍␊ |
| 463 | #define PNG_HAVE_cHRM 0x40␍␊ |
| 464 | #define PNG_HAVE_sRGB 0x80␍␊ |
| 465 | #define PNG_HAVE_CHUNK_HEADER 0x100␍␊ |
| 466 | #define PNG_WROTE_tIME 0x200␍␊ |
| 467 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400␍␊ |
| 468 | #define PNG_BACKGROUND_IS_GRAY 0x800␍␊ |
| 469 | #define PNG_HAVE_PNG_SIGNATURE 0x1000␍␊ |
| 470 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */␍␊ |
| 471 | #define PNG_HAVE_iCCP 0x4000␍␊ |
| 472 | ␍␊ |
| 473 | /* Flags for the transformations the PNG library does on the image data */␍␊ |
| 474 | #define PNG_BGR 0x0001␍␊ |
| 475 | #define PNG_INTERLACE 0x0002␍␊ |
| 476 | #define PNG_PACK 0x0004␍␊ |
| 477 | #define PNG_SHIFT 0x0008␍␊ |
| 478 | #define PNG_SWAP_BYTES 0x0010␍␊ |
| 479 | #define PNG_INVERT_MONO 0x0020␍␊ |
| 480 | #define PNG_QUANTIZE 0x0040␍␊ |
| 481 | #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */␍␊ |
| 482 | #define PNG_BACKGROUND_EXPAND 0x0100␍␊ |
| 483 | #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */␍␊ |
| 484 | #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */␍␊ |
| 485 | #define PNG_RGBA 0x0800␍␊ |
| 486 | #define PNG_EXPAND 0x1000␍␊ |
| 487 | #define PNG_GAMMA 0x2000␍␊ |
| 488 | #define PNG_GRAY_TO_RGB 0x4000␍␊ |
| 489 | #define PNG_FILLER 0x8000␍␊ |
| 490 | #define PNG_PACKSWAP 0x10000␍␊ |
| 491 | #define PNG_SWAP_ALPHA 0x20000␍␊ |
| 492 | #define PNG_STRIP_ALPHA 0x40000␍␊ |
| 493 | #define PNG_INVERT_ALPHA 0x80000␍␊ |
| 494 | #define PNG_USER_TRANSFORM 0x100000␍␊ |
| 495 | #define PNG_RGB_TO_GRAY_ERR 0x200000␍␊ |
| 496 | #define PNG_RGB_TO_GRAY_WARN 0x400000␍␊ |
| 497 | #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */␍␊ |
| 498 | #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */␍␊ |
| 499 | #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */␍␊ |
| 500 | #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */␍␊ |
| 501 | #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */␍␊ |
| 502 | /* 0x8000000 unused */␍␊ |
| 503 | /* 0x10000000 unused */␍␊ |
| 504 | /* 0x20000000 unused */␍␊ |
| 505 | /* 0x40000000 unused */␍␊ |
| 506 | /* Flags for png_create_struct */␍␊ |
| 507 | #define PNG_STRUCT_PNG 0x0001␍␊ |
| 508 | #define PNG_STRUCT_INFO 0x0002␍␊ |
| 509 | ␍␊ |
| 510 | /* Scaling factor for filter heuristic weighting calculations */␍␊ |
| 511 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))␍␊ |
| 512 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))␍␊ |
| 513 | ␍␊ |
| 514 | /* Flags for the png_ptr->flags rather than declaring a byte for each one */␍␊ |
| 515 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001␍␊ |
| 516 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002␍␊ |
| 517 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004␍␊ |
| 518 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008␍␊ |
| 519 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010␍␊ |
| 520 | #define PNG_FLAG_ZLIB_FINISHED 0x0020␍␊ |
| 521 | #define PNG_FLAG_ROW_INIT 0x0040␍␊ |
| 522 | #define PNG_FLAG_FILLER_AFTER 0x0080␍␊ |
| 523 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100␍␊ |
| 524 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200␍␊ |
| 525 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400␍␊ |
| 526 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800␍␊ |
| 527 | #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */␍␊ |
| 528 | #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */␍␊ |
| 529 | #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */␍␊ |
| 530 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000␍␊ |
| 531 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000␍␊ |
| 532 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000␍␊ |
| 533 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000␍␊ |
| 534 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000␍␊ |
| 535 | #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000␍␊ |
| 536 | /* 0x200000 unused */␍␊ |
| 537 | /* 0x400000 unused */␍␊ |
| 538 | #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */␍␊ |
| 539 | #define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */␍␊ |
| 540 | #define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */␍␊ |
| 541 | #define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000␍␊ |
| 542 | #define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000␍␊ |
| 543 | #define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000␍␊ |
| 544 | /* 0x20000000 unused */␍␊ |
| 545 | /* 0x40000000 unused */␍␊ |
| 546 | ␍␊ |
| 547 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \␍␊ |
| 548 | PNG_FLAG_CRC_ANCILLARY_NOWARN)␍␊ |
| 549 | ␍␊ |
| 550 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \␍␊ |
| 551 | PNG_FLAG_CRC_CRITICAL_IGNORE)␍␊ |
| 552 | ␍␊ |
| 553 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \␍␊ |
| 554 | PNG_FLAG_CRC_CRITICAL_MASK)␍␊ |
| 555 | ␍␊ |
| 556 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib␍␊ |
| 557 | * can handle at once. This type need be no larger than 16 bits (so maximum of␍␊ |
| 558 | * 65535), this define allows us to discover how big it is, but limited by the␍␊ |
| 559 | * maximuum for png_size_t. The value can be overriden in a library build␍␊ |
| 560 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably␍␊ |
| 561 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly)␍␊ |
| 562 | * and may even improve performance on some systems (and degrade it on others.)␍␊ |
| 563 | */␍␊ |
| 564 | #ifndef ZLIB_IO_MAX␍␊ |
| 565 | # define ZLIB_IO_MAX ((uInt)-1)␍␊ |
| 566 | #endif␍␊ |
| 567 | ␍␊ |
| 568 | /* Save typing and make code easier to understand */␍␊ |
| 569 | ␍␊ |
| 570 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \␍␊ |
| 571 | abs((int)((c1).green) - (int)((c2).green)) + \␍␊ |
| 572 | abs((int)((c1).blue) - (int)((c2).blue)))␍␊ |
| 573 | ␍␊ |
| 574 | /* Added to libpng-1.2.6 JB */␍␊ |
| 575 | #define PNG_ROWBYTES(pixel_bits, width) \␍␊ |
| 576 | ((pixel_bits) >= 8 ? \␍␊ |
| 577 | ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \␍␊ |
| 578 | (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) )␍␊ |
| 579 | ␍␊ |
| 580 | /* PNG_OUT_OF_RANGE returns true if value is outside the range␍␊ |
| 581 | * ideal-delta..ideal+delta. Each argument is evaluated twice.␍␊ |
| 582 | * "ideal" and "delta" should be constants, normally simple␍␊ |
| 583 | * integers, "value" a variable. Added to libpng-1.2.6 JB␍␊ |
| 584 | */␍␊ |
| 585 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \␍␊ |
| 586 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )␍␊ |
| 587 | ␍␊ |
| 588 | /* Conversions between fixed and floating point, only defined if␍␊ |
| 589 | * required (to make sure the code doesn't accidentally use float␍␊ |
| 590 | * when it is supposedly disabled.)␍␊ |
| 591 | */␍␊ |
| 592 | #ifdef PNG_FLOATING_POINT_SUPPORTED␍␊ |
| 593 | /* The floating point conversion can't overflow, though it can and␍␊ |
| 594 | * does lose accuracy relative to the original fixed point value.␍␊ |
| 595 | * In practice this doesn't matter because png_fixed_point only␍␊ |
| 596 | * stores numbers with very low precision. The png_ptr and s␍␊ |
| 597 | * arguments are unused by default but are there in case error␍␊ |
| 598 | * checking becomes a requirement.␍␊ |
| 599 | */␍␊ |
| 600 | #define png_float(png_ptr, fixed, s) (.00001 * (fixed))␍␊ |
| 601 | ␍␊ |
| 602 | /* The fixed point conversion performs range checking and evaluates␍␊ |
| 603 | * its argument multiple times, so must be used with care. The␍␊ |
| 604 | * range checking uses the PNG specification values for a signed␍␊ |
| 605 | * 32 bit fixed point value except that the values are deliberately␍␊ |
| 606 | * rounded-to-zero to an integral value - 21474 (21474.83 is roughly␍␊ |
| 607 | * (2^31-1) * 100000). 's' is a string that describes the value being␍␊ |
| 608 | * converted.␍␊ |
| 609 | *␍␊ |
| 610 | * NOTE: this macro will raise a png_error if the range check fails,␍␊ |
| 611 | * therefore it is normally only appropriate to use this on values␍␊ |
| 612 | * that come from API calls or other sources where an out of range␍␊ |
| 613 | * error indicates a programming error, not a data error!␍␊ |
| 614 | *␍␊ |
| 615 | * NOTE: by default this is off - the macro is not used - because the␍␊ |
| 616 | * function call saves a lot of code.␍␊ |
| 617 | */␍␊ |
| 618 | #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED␍␊ |
| 619 | #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\␍␊ |
| 620 | ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0))␍␊ |
| 621 | #else␍␊ |
| 622 | PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp,␍␊ |
| 623 | png_const_charp text));␍␊ |
| 624 | #endif␍␊ |
| 625 | #endif␍␊ |
| 626 | ␍␊ |
| 627 | /* Constants for known chunk types. If you need to add a chunk, define the name␍␊ |
| 628 | * here. For historical reasons these constants have the form png_<name>; i.e.␍␊ |
| 629 | * the prefix is lower case. Please use decimal values as the parameters to␍␊ |
| 630 | * match the ISO PNG specification and to avoid relying on the C locale␍␊ |
| 631 | * interpretation of character values.␍␊ |
| 632 | *␍␊ |
| 633 | * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values␍␊ |
| 634 | * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string␍␊ |
| 635 | * to be generated if required.␍␊ |
| 636 | *␍␊ |
| 637 | * PNG_32b correctly produces a value shifted by up to 24 bits, even on␍␊ |
| 638 | * architectures where (int) is only 16 bits.␍␊ |
| 639 | */␍␊ |
| 640 | #define PNG_32b(b,s) ((png_uint_32)(b) << (s))␍␊ |
| 641 | #define PNG_CHUNK(b1,b2,b3,b4) \␍␊ |
| 642 | (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0))␍␊ |
| 643 | ␍␊ |
| 644 | #define png_IHDR PNG_CHUNK( 73, 72, 68, 82)␍␊ |
| 645 | #define png_IDAT PNG_CHUNK( 73, 68, 65, 84)␍␊ |
| 646 | #define png_IEND PNG_CHUNK( 73, 69, 78, 68)␍␊ |
| 647 | #define png_PLTE PNG_CHUNK( 80, 76, 84, 69)␍␊ |
| 648 | #define png_bKGD PNG_CHUNK( 98, 75, 71, 68)␍␊ |
| 649 | #define png_cHRM PNG_CHUNK( 99, 72, 82, 77)␍␊ |
| 650 | #define png_gAMA PNG_CHUNK(103, 65, 77, 65)␍␊ |
| 651 | #define png_hIST PNG_CHUNK(104, 73, 83, 84)␍␊ |
| 652 | #define png_iCCP PNG_CHUNK(105, 67, 67, 80)␍␊ |
| 653 | #define png_iTXt PNG_CHUNK(105, 84, 88, 116)␍␊ |
| 654 | #define png_oFFs PNG_CHUNK(111, 70, 70, 115)␍␊ |
| 655 | #define png_pCAL PNG_CHUNK(112, 67, 65, 76)␍␊ |
| 656 | #define png_sCAL PNG_CHUNK(115, 67, 65, 76)␍␊ |
| 657 | #define png_pHYs PNG_CHUNK(112, 72, 89, 115)␍␊ |
| 658 | #define png_sBIT PNG_CHUNK(115, 66, 73, 84)␍␊ |
| 659 | #define png_sPLT PNG_CHUNK(115, 80, 76, 84)␍␊ |
| 660 | #define png_sRGB PNG_CHUNK(115, 82, 71, 66)␍␊ |
| 661 | #define png_sTER PNG_CHUNK(115, 84, 69, 82)␍␊ |
| 662 | #define png_tEXt PNG_CHUNK(116, 69, 88, 116)␍␊ |
| 663 | #define png_tIME PNG_CHUNK(116, 73, 77, 69)␍␊ |
| 664 | #define png_tRNS PNG_CHUNK(116, 82, 78, 83)␍␊ |
| 665 | #define png_zTXt PNG_CHUNK(122, 84, 88, 116)␍␊ |
| 666 | ␍␊ |
| 667 | /* The following will work on (signed char*) strings, whereas the get_uint_32␍␊ |
| 668 | * macro will fail on top-bit-set values because of the sign extension.␍␊ |
| 669 | */␍␊ |
| 670 | #define PNG_CHUNK_FROM_STRING(s)\␍␊ |
| 671 | PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3])␍␊ |
| 672 | ␍␊ |
| 673 | /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is␍␊ |
| 674 | * signed and the argument is a (char[]) This macro will fail miserably on␍␊ |
| 675 | * systems where (char) is more than 8 bits.␍␊ |
| 676 | */␍␊ |
| 677 | #define PNG_STRING_FROM_CHUNK(s,c)\␍␊ |
| 678 | (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\␍␊ |
| 679 | ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c)))␍␊ |
| 680 | ␍␊ |
| 681 | /* Do the same but terminate with a null character. */␍␊ |
| 682 | #define PNG_CSTRING_FROM_CHUNK(s,c)\␍␊ |
| 683 | (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0)␍␊ |
| 684 | ␍␊ |
| 685 | /* Test on flag values as defined in the spec (section 5.4): */␍␊ |
| 686 | #define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29))␍␊ |
| 687 | #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c))␍␊ |
| 688 | #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21))␍␊ |
| 689 | #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13))␍␊ |
| 690 | #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5))␍␊ |
| 691 | ␍␊ |
| 692 | /* Gamma values (new at libpng-1.5.4): */␍␊ |
| 693 | #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */␍␊ |
| 694 | #define PNG_GAMMA_MAC_INVERSE 65909␍␊ |
| 695 | #define PNG_GAMMA_sRGB_INVERSE 45455␍␊ |
| 696 | ␍␊ |
| 697 | ␍␊ |
| 698 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */␍␊ |
| 699 | #ifdef __cplusplus␍␊ |
| 700 | extern "C" {␍␊ |
| 701 | #endif /* __cplusplus */␍␊ |
| 702 | ␍␊ |
| 703 | /* These functions are used internally in the code. They generally␍␊ |
| 704 | * shouldn't be used unless you are writing code to add or replace some␍␊ |
| 705 | * functionality in libpng. More information about most functions can␍␊ |
| 706 | * be found in the files where the functions are located.␍␊ |
| 707 | */␍␊ |
| 708 | ␍␊ |
| 709 | /* Check the user version string for compatibility, returns false if the version␍␊ |
| 710 | * numbers aren't compatible.␍␊ |
| 711 | */␍␊ |
| 712 | PNG_EXTERN int png_user_version_check(png_structp png_ptr,␍␊ |
| 713 | png_const_charp user_png_ver);␍␊ |
| 714 | ␍␊ |
| 715 | /* Allocate memory for an internal libpng struct */␍␊ |
| 716 | PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)),␍␊ |
| 717 | PNG_ALLOCATED);␍␊ |
| 718 | ␍␊ |
| 719 | /* Free memory from internal libpng struct */␍␊ |
| 720 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));␍␊ |
| 721 | ␍␊ |
| 722 | PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2,␍␊ |
| 723 | PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)),␍␊ |
| 724 | PNG_ALLOCATED);␍␊ |
| 725 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,␍␊ |
| 726 | png_free_ptr free_fn, png_voidp mem_ptr));␍␊ |
| 727 | ␍␊ |
| 728 | /* Free any memory that info_ptr points to and reset struct. */␍␊ |
| 729 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,␍␊ |
| 730 | png_infop info_ptr));␍␊ |
| 731 | ␍␊ |
| 732 | /* Function to allocate memory for zlib. PNGAPI is disallowed. */␍␊ |
| 733 | PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items,␍␊ |
| 734 | uInt size)),PNG_ALLOCATED);␍␊ |
| 735 | ␍␊ |
| 736 | /* Function to free memory for zlib. PNGAPI is disallowed. */␍␊ |
| 737 | PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));␍␊ |
| 738 | ␍␊ |
| 739 | PNG_EXTERN void PNGAPI␍␊ |
| 740 | ␉png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,␍␊ |
| 741 | ␉␉␉␉␉png_rw_ptr read_data_fn);␍␊ |
| 742 | ␉␍␊ |
| 743 | /* Next four functions are used internally as callbacks. PNGCBAPI is required␍␊ |
| 744 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to␍␊ |
| 745 | * PNGCBAPI at 1.5.0␍␊ |
| 746 | */␍␊ |
| 747 | ␍␊ |
| 748 | PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr,␍␊ |
| 749 | png_bytep data, png_size_t length));␍␊ |
| 750 | ␍␊ |
| 751 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED␍␊ |
| 752 | PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr,␍␊ |
| 753 | png_bytep buffer, png_size_t length));␍␊ |
| 754 | #endif␍␊ |
| 755 | ␍␊ |
| 756 | PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr,␍␊ |
| 757 | png_bytep data, png_size_t length));␍␊ |
| 758 | ␍␊ |
| 759 | #ifdef PNG_WRITE_FLUSH_SUPPORTED␍␊ |
| 760 | # ifdef PNG_STDIO_SUPPORTED␍␊ |
| 761 | PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr));␍␊ |
| 762 | # endif␍␊ |
| 763 | #endif␍␊ |
| 764 | ␍␊ |
| 765 | /* Reset the CRC variable */␍␊ |
| 766 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));␍␊ |
| 767 | ␍␊ |
| 768 | /* Write the "data" buffer to whatever output you are using */␍␊ |
| 769 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr,␍␊ |
| 770 | png_const_bytep data, png_size_t length));␍␊ |
| 771 | ␍␊ |
| 772 | /* Read and check the PNG file signature */␍␊ |
| 773 | PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr));␍␊ |
| 774 | ␍␊ |
| 775 | /* Read the chunk header (length + type name) */␍␊ |
| 776 | PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));␍␊ |
| 777 | ␍␊ |
| 778 | /* Read data from whatever input you are using into the "data" buffer */␍␊ |
| 779 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,␍␊ |
| 780 | png_size_t length));␍␊ |
| 781 | ␍␊ |
| 782 | /* Read bytes into buf, and update png_ptr->crc */␍␊ |
| 783 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,␍␊ |
| 784 | png_size_t length));␍␊ |
| 785 | ␍␊ |
| 786 | /* Decompress data in a chunk that uses compression */␍␊ |
| 787 | #if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED)␍␊ |
| 788 | PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,␍␊ |
| 789 | int comp_type, png_size_t chunklength, png_size_t prefix_length,␍␊ |
| 790 | png_size_t *data_length));␍␊ |
| 791 | #endif␍␊ |
| 792 | ␍␊ |
| 793 | /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */␍␊ |
| 794 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));␍␊ |
| 795 | ␍␊ |
| 796 | /* Read the CRC from the file and compare it to the libpng calculated CRC */␍␊ |
| 797 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));␍␊ |
| 798 | ␍␊ |
| 799 | /* Calculate the CRC over a section of data. Note that we are only␍␊ |
| 800 | * passing a maximum of 64K on systems that have this as a memory limit,␍␊ |
| 801 | * since this is the maximum buffer size we can specify.␍␊ |
| 802 | */␍␊ |
| 803 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr,␍␊ |
| 804 | png_const_bytep ptr, png_size_t length));␍␊ |
| 805 | ␍␊ |
| 806 | #ifdef PNG_WRITE_FLUSH_SUPPORTED␍␊ |
| 807 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));␍␊ |
| 808 | #endif␍␊ |
| 809 | ␍␊ |
| 810 | /* Write various chunks */␍␊ |
| 811 | ␍␊ |
| 812 | /* Write the IHDR chunk, and update the png_struct with the necessary␍␊ |
| 813 | * information.␍␊ |
| 814 | */␍␊ |
| 815 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,␍␊ |
| 816 | png_uint_32 height,␍␊ |
| 817 | int bit_depth, int color_type, int compression_method, int filter_method,␍␊ |
| 818 | int interlace_method));␍␊ |
| 819 | ␍␊ |
| 820 | PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr,␍␊ |
| 821 | png_const_colorp palette, png_uint_32 num_pal));␍␊ |
| 822 | ␍␊ |
| 823 | PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,␍␊ |
| 824 | png_size_t length));␍␊ |
| 825 | ␍␊ |
| 826 | PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));␍␊ |
| 827 | ␍␊ |
| 828 | #ifdef PNG_WRITE_gAMA_SUPPORTED␍␊ |
| 829 | # ifdef PNG_FLOATING_POINT_SUPPORTED␍␊ |
| 830 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));␍␊ |
| 831 | # endif␍␊ |
| 832 | # ifdef PNG_FIXED_POINT_SUPPORTED␍␊ |
| 833 | PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,␍␊ |
| 834 | png_fixed_point file_gamma));␍␊ |
| 835 | # endif␍␊ |
| 836 | #endif␍␊ |
| 837 | ␍␊ |
| 838 | #ifdef PNG_WRITE_sBIT_SUPPORTED␍␊ |
| 839 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr,␍␊ |
| 840 | png_const_color_8p sbit, int color_type));␍␊ |
| 841 | #endif␍␊ |
| 842 | ␍␊ |
| 843 | #ifdef PNG_WRITE_cHRM_SUPPORTED␍␊ |
| 844 | # ifdef PNG_FLOATING_POINT_SUPPORTED␍␊ |
| 845 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,␍␊ |
| 846 | double white_x, double white_y,␍␊ |
| 847 | double red_x, double red_y, double green_x, double green_y,␍␊ |
| 848 | double blue_x, double blue_y));␍␊ |
| 849 | # endif␍␊ |
| 850 | PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,␍␊ |
| 851 | png_fixed_point int_white_x, png_fixed_point int_white_y,␍␊ |
| 852 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point␍␊ |
| 853 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,␍␊ |
| 854 | png_fixed_point int_blue_y));␍␊ |
| 855 | #endif␍␊ |
| 856 | ␍␊ |
| 857 | #ifdef PNG_WRITE_sRGB_SUPPORTED␍␊ |
| 858 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,␍␊ |
| 859 | int intent));␍␊ |
| 860 | #endif␍␊ |
| 861 | ␍␊ |
| 862 | #ifdef PNG_WRITE_iCCP_SUPPORTED␍␊ |
| 863 | PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,␍␊ |
| 864 | png_const_charp name, int compression_type,␍␊ |
| 865 | png_const_charp profile, int proflen));␍␊ |
| 866 | /* Note to maintainer: profile should be png_bytep */␍␊ |
| 867 | #endif␍␊ |
| 868 | ␍␊ |
| 869 | #ifdef PNG_WRITE_sPLT_SUPPORTED␍␊ |
| 870 | PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,␍␊ |
| 871 | png_const_sPLT_tp palette));␍␊ |
| 872 | #endif␍␊ |
| 873 | ␍␊ |
| 874 | #ifdef PNG_WRITE_tRNS_SUPPORTED␍␊ |
| 875 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr,␍␊ |
| 876 | png_const_bytep trans, png_const_color_16p values, int number,␍␊ |
| 877 | int color_type));␍␊ |
| 878 | #endif␍␊ |
| 879 | ␍␊ |
| 880 | #ifdef PNG_WRITE_bKGD_SUPPORTED␍␊ |
| 881 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,␍␊ |
| 882 | png_const_color_16p values, int color_type));␍␊ |
| 883 | #endif␍␊ |
| 884 | ␍␊ |
| 885 | #ifdef PNG_WRITE_hIST_SUPPORTED␍␊ |
| 886 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr,␍␊ |
| 887 | png_const_uint_16p hist, int num_hist));␍␊ |
| 888 | #endif␍␊ |
| 889 | ␍␊ |
| 890 | /* Chunks that have keywords */␍␊ |
| 891 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \␍␊ |
| 892 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)␍␊ |
| 893 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,␍␊ |
| 894 | png_const_charp key, png_charpp new_key));␍␊ |
| 895 | #endif␍␊ |
| 896 | ␍␊ |
| 897 | #ifdef PNG_WRITE_tEXt_SUPPORTED␍␊ |
| 898 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key,␍␊ |
| 899 | png_const_charp text, png_size_t text_len));␍␊ |
| 900 | #endif␍␊ |
| 901 | ␍␊ |
| 902 | #ifdef PNG_WRITE_zTXt_SUPPORTED␍␊ |
| 903 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key,␍␊ |
| 904 | png_const_charp text, png_size_t text_len, int compression));␍␊ |
| 905 | #endif␍␊ |
| 906 | ␍␊ |
| 907 | #ifdef PNG_WRITE_iTXt_SUPPORTED␍␊ |
| 908 | PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,␍␊ |
| 909 | int compression, png_const_charp key, png_const_charp lang,␍␊ |
| 910 | png_const_charp lang_key, png_const_charp text));␍␊ |
| 911 | #endif␍␊ |
| 912 | ␍␊ |
| 913 | #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */␍␊ |
| 914 | PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,␍␊ |
| 915 | png_infop info_ptr, png_const_textp text_ptr, int num_text));␍␊ |
| 916 | #endif␍␊ |
| 917 | ␍␊ |
| 918 | #ifdef PNG_WRITE_oFFs_SUPPORTED␍␊ |
| 919 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,␍␊ |
| 920 | png_int_32 x_offset, png_int_32 y_offset, int unit_type));␍␊ |
| 921 | #endif␍␊ |
| 922 | ␍␊ |
| 923 | #ifdef PNG_WRITE_pCAL_SUPPORTED␍␊ |
| 924 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,␍␊ |
| 925 | png_int_32 X0, png_int_32 X1, int type, int nparams,␍␊ |
| 926 | png_const_charp units, png_charpp params));␍␊ |
| 927 | #endif␍␊ |
| 928 | ␍␊ |
| 929 | #ifdef PNG_WRITE_pHYs_SUPPORTED␍␊ |
| 930 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,␍␊ |
| 931 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,␍␊ |
| 932 | int unit_type));␍␊ |
| 933 | #endif␍␊ |
| 934 | ␍␊ |
| 935 | #ifdef PNG_WRITE_tIME_SUPPORTED␍␊ |
| 936 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,␍␊ |
| 937 | png_const_timep mod_time));␍␊ |
| 938 | #endif␍␊ |
| 939 | ␍␊ |
| 940 | #ifdef PNG_WRITE_sCAL_SUPPORTED␍␊ |
| 941 | PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,␍␊ |
| 942 | int unit, png_const_charp width, png_const_charp height));␍␊ |
| 943 | #endif␍␊ |
| 944 | ␍␊ |
| 945 | /* Called when finished processing a row of data */␍␊ |
| 946 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));␍␊ |
| 947 | ␍␊ |
| 948 | /* Internal use only. Called before first row of data */␍␊ |
| 949 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));␍␊ |
| 950 | ␍␊ |
| 951 | /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an␍␊ |
| 952 | * array of png_ptr->width pixels. If the image is not interlaced or this␍␊ |
| 953 | * is the final pass this just does a png_memcpy, otherwise the "display" flag␍␊ |
| 954 | * is used to determine whether to copy pixels that are not in the current pass.␍␊ |
| 955 | *␍␊ |
| 956 | * Because 'png_do_read_interlace' (below) replicates pixels this allows this␍␊ |
| 957 | * function to achieve the documented 'blocky' appearance during interlaced read␍␊ |
| 958 | * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row'␍␊ |
| 959 | * are not changed if they are not in the current pass, when display is 0.␍␊ |
| 960 | *␍␊ |
| 961 | * 'display' must be 0 or 1, otherwise the memcpy will be done regardless.␍␊ |
| 962 | *␍␊ |
| 963 | * The API always reads from the png_struct row buffer and always assumes that␍␊ |
| 964 | * it is full width (png_do_read_interlace has already been called.)␍␊ |
| 965 | *␍␊ |
| 966 | * This function is only ever used to write to row buffers provided by the␍␊ |
| 967 | * caller of the relevant libpng API and the row must have already been␍␊ |
| 968 | * transformed by the read transformations.␍␊ |
| 969 | *␍␊ |
| 970 | * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed␍␊ |
| 971 | * bitmasks for use within the code, otherwise runtime generated masks are used.␍␊ |
| 972 | * The default is compile time masks.␍␊ |
| 973 | */␍␊ |
| 974 | #ifndef PNG_USE_COMPILE_TIME_MASKS␍␊ |
| 975 | # define PNG_USE_COMPILE_TIME_MASKS 1␍␊ |
| 976 | #endif␍␊ |
| 977 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,␍␊ |
| 978 | int display));␍␊ |
| 979 | ␍␊ |
| 980 | #ifdef PNG_READ_INTERLACING_SUPPORTED␍␊ |
| 981 | /* Expand an interlaced row: the 'row_info' describes the pass data that has␍␊ |
| 982 | * been read in and must correspond to the pixels in 'row', the pixels are␍␊ |
| 983 | * expanded (moved apart) in 'row' to match the final layout, when doing this␍␊ |
| 984 | * the pixels are *replicated* to the intervening space. This is essential for␍␊ |
| 985 | * the correct operation of png_combine_row, above.␍␊ |
| 986 | */␍␊ |
| 987 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,␍␊ |
| 988 | png_bytep row, int pass, png_uint_32 transformations));␍␊ |
| 989 | #endif␍␊ |
| 990 | ␍␊ |
| 991 | /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */␍␊ |
| 992 | ␍␊ |
| 993 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED␍␊ |
| 994 | /* Grab pixels out of a row for an interlaced pass */␍␊ |
| 995 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,␍␊ |
| 996 | png_bytep row, int pass));␍␊ |
| 997 | #endif␍␊ |
| 998 | ␍␊ |
| 999 | /* Unfilter a row: check the filter value before calling this, there is no point␍␊ |
| 1000 | * calling it for PNG_FILTER_VALUE_NONE.␍␊ |
| 1001 | */␍␊ |
| 1002 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop␍␊ |
| 1003 | row_info, png_bytep row, png_const_bytep prev_row, int filter));␍␊ |
| 1004 | ␍␊ |
| 1005 | PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info,␍␊ |
| 1006 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1007 | PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info,␍␊ |
| 1008 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1009 | PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info,␍␊ |
| 1010 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1011 | PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info,␍␊ |
| 1012 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1013 | PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info,␍␊ |
| 1014 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1015 | PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info,␍␊ |
| 1016 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1017 | PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info,␍␊ |
| 1018 | png_bytep row, png_const_bytep prev_row));␍␊ |
| 1019 | ␍␊ |
| 1020 | /* Choose the best filter to use and filter the row data */␍␊ |
| 1021 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,␍␊ |
| 1022 | png_row_infop row_info));␍␊ |
| 1023 | ␍␊ |
| 1024 | /* Finish a row while reading, dealing with interlacing passes, etc. */␍␊ |
| 1025 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));␍␊ |
| 1026 | ␍␊ |
| 1027 | /* Initialize the row buffers, etc. */␍␊ |
| 1028 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));␍␊ |
| 1029 | ␍␊ |
| 1030 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED␍␊ |
| 1031 | /* Optional call to update the users info structure */␍␊ |
| 1032 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,␍␊ |
| 1033 | png_infop info_ptr));␍␊ |
| 1034 | #endif␍␊ |
| 1035 | ␍␊ |
| 1036 | /* These are the functions that do the transformations */␍␊ |
| 1037 | #ifdef PNG_READ_FILLER_SUPPORTED␍␊ |
| 1038 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,␍␊ |
| 1039 | png_bytep row, png_uint_32 filler, png_uint_32 flags));␍␊ |
| 1040 | #endif␍␊ |
| 1041 | ␍␊ |
| 1042 | #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED␍␊ |
| 1043 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,␍␊ |
| 1044 | png_bytep row));␍␊ |
| 1045 | #endif␍␊ |
| 1046 | ␍␊ |
| 1047 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED␍␊ |
| 1048 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,␍␊ |
| 1049 | png_bytep row));␍␊ |
| 1050 | #endif␍␊ |
| 1051 | ␍␊ |
| 1052 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED␍␊ |
| 1053 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,␍␊ |
| 1054 | png_bytep row));␍␊ |
| 1055 | #endif␍␊ |
| 1056 | ␍␊ |
| 1057 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED␍␊ |
| 1058 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,␍␊ |
| 1059 | png_bytep row));␍␊ |
| 1060 | #endif␍␊ |
| 1061 | ␍␊ |
| 1062 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \␍␊ |
| 1063 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED)␍␊ |
| 1064 | PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info,␍␊ |
| 1065 | png_bytep row, int at_start));␍␊ |
| 1066 | #endif␍␊ |
| 1067 | ␍␊ |
| 1068 | #ifdef PNG_16BIT_SUPPORTED␍␊ |
| 1069 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)␍␊ |
| 1070 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,␍␊ |
| 1071 | png_bytep row));␍␊ |
| 1072 | #endif␍␊ |
| 1073 | #endif␍␊ |
| 1074 | ␍␊ |
| 1075 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \␍␊ |
| 1076 | defined(PNG_WRITE_PACKSWAP_SUPPORTED)␍␊ |
| 1077 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,␍␊ |
| 1078 | png_bytep row));␍␊ |
| 1079 | #endif␍␊ |
| 1080 | ␍␊ |
| 1081 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED␍␊ |
| 1082 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr,␍␊ |
| 1083 | png_row_infop row_info, png_bytep row));␍␊ |
| 1084 | #endif␍␊ |
| 1085 | ␍␊ |
| 1086 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED␍␊ |
| 1087 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,␍␊ |
| 1088 | png_bytep row));␍␊ |
| 1089 | #endif␍␊ |
| 1090 | ␍␊ |
| 1091 | #ifdef PNG_READ_PACK_SUPPORTED␍␊ |
| 1092 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,␍␊ |
| 1093 | png_bytep row));␍␊ |
| 1094 | #endif␍␊ |
| 1095 | ␍␊ |
| 1096 | #ifdef PNG_READ_SHIFT_SUPPORTED␍␊ |
| 1097 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info,␍␊ |
| 1098 | png_bytep row, png_const_color_8p sig_bits));␍␊ |
| 1099 | #endif␍␊ |
| 1100 | ␍␊ |
| 1101 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)␍␊ |
| 1102 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,␍␊ |
| 1103 | png_bytep row));␍␊ |
| 1104 | #endif␍␊ |
| 1105 | ␍␊ |
| 1106 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED␍␊ |
| 1107 | PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info,␍␊ |
| 1108 | png_bytep row));␍␊ |
| 1109 | #endif␍␊ |
| 1110 | ␍␊ |
| 1111 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED␍␊ |
| 1112 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,␍␊ |
| 1113 | png_bytep row));␍␊ |
| 1114 | #endif␍␊ |
| 1115 | ␍␊ |
| 1116 | #ifdef PNG_READ_QUANTIZE_SUPPORTED␍␊ |
| 1117 | PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info,␍␊ |
| 1118 | png_bytep row, png_const_bytep palette_lookup,␍␊ |
| 1119 | png_const_bytep quantize_lookup));␍␊ |
| 1120 | ␍␊ |
| 1121 | # ifdef PNG_CORRECT_PALETTE_SUPPORTED␍␊ |
| 1122 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,␍␊ |
| 1123 | png_colorp palette, int num_palette));␍␊ |
| 1124 | # endif␍␊ |
| 1125 | #endif␍␊ |
| 1126 | ␍␊ |
| 1127 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)␍␊ |
| 1128 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,␍␊ |
| 1129 | png_bytep row));␍␊ |
| 1130 | #endif␍␊ |
| 1131 | ␍␊ |
| 1132 | #ifdef PNG_WRITE_PACK_SUPPORTED␍␊ |
| 1133 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,␍␊ |
| 1134 | png_bytep row, png_uint_32 bit_depth));␍␊ |
| 1135 | #endif␍␊ |
| 1136 | ␍␊ |
| 1137 | #ifdef PNG_WRITE_SHIFT_SUPPORTED␍␊ |
| 1138 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info,␍␊ |
| 1139 | png_bytep row, png_const_color_8p bit_depth));␍␊ |
| 1140 | #endif␍␊ |
| 1141 | ␍␊ |
| 1142 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\␍␊ |
| 1143 | defined(PNG_READ_ALPHA_MODE_SUPPORTED)␍␊ |
| 1144 | PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info,␍␊ |
| 1145 | png_bytep row, png_structp png_ptr));␍␊ |
| 1146 | #endif␍␊ |
| 1147 | ␍␊ |
| 1148 | #ifdef PNG_READ_GAMMA_SUPPORTED␍␊ |
| 1149 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info,␍␊ |
| 1150 | png_bytep row, png_structp png_ptr));␍␊ |
| 1151 | #endif␍␊ |
| 1152 | ␍␊ |
| 1153 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED␍␊ |
| 1154 | PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info,␍␊ |
| 1155 | png_bytep row, png_structp png_ptr));␍␊ |
| 1156 | #endif␍␊ |
| 1157 | ␍␊ |
| 1158 | #ifdef PNG_READ_EXPAND_SUPPORTED␍␊ |
| 1159 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,␍␊ |
| 1160 | png_bytep row, png_const_colorp palette, png_const_bytep trans,␍␊ |
| 1161 | int num_trans));␍␊ |
| 1162 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,␍␊ |
| 1163 | png_bytep row, png_const_color_16p trans_color));␍␊ |
| 1164 | #endif␍␊ |
| 1165 | ␍␊ |
| 1166 | #ifdef PNG_READ_EXPAND_16_SUPPORTED␍␊ |
| 1167 | PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info,␍␊ |
| 1168 | png_bytep row));␍␊ |
| 1169 | #endif␍␊ |
| 1170 | ␍␊ |
| 1171 | /* The following decodes the appropriate chunks, and does error correction,␍␊ |
| 1172 | * then calls the appropriate callback for the chunk if it is valid.␍␊ |
| 1173 | */␍␊ |
| 1174 | ␍␊ |
| 1175 | /* Decode the IHDR chunk */␍␊ |
| 1176 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1177 | png_uint_32 length));␍␊ |
| 1178 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1179 | png_uint_32 length));␍␊ |
| 1180 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1181 | png_uint_32 length));␍␊ |
| 1182 | ␍␊ |
| 1183 | #ifdef PNG_READ_bKGD_SUPPORTED␍␊ |
| 1184 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1185 | png_uint_32 length));␍␊ |
| 1186 | #endif␍␊ |
| 1187 | ␍␊ |
| 1188 | #ifdef PNG_READ_cHRM_SUPPORTED␍␊ |
| 1189 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1190 | png_uint_32 length));␍␊ |
| 1191 | #endif␍␊ |
| 1192 | ␍␊ |
| 1193 | #ifdef PNG_READ_gAMA_SUPPORTED␍␊ |
| 1194 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1195 | png_uint_32 length));␍␊ |
| 1196 | #endif␍␊ |
| 1197 | ␍␊ |
| 1198 | #ifdef PNG_READ_hIST_SUPPORTED␍␊ |
| 1199 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1200 | png_uint_32 length));␍␊ |
| 1201 | #endif␍␊ |
| 1202 | ␍␊ |
| 1203 | #ifdef PNG_READ_iCCP_SUPPORTED␍␊ |
| 1204 | PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1205 | png_uint_32 length));␍␊ |
| 1206 | #endif /* PNG_READ_iCCP_SUPPORTED */␍␊ |
| 1207 | ␍␊ |
| 1208 | #ifdef PNG_READ_iTXt_SUPPORTED␍␊ |
| 1209 | PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1210 | png_uint_32 length));␍␊ |
| 1211 | #endif␍␊ |
| 1212 | ␍␊ |
| 1213 | #ifdef PNG_READ_oFFs_SUPPORTED␍␊ |
| 1214 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1215 | png_uint_32 length));␍␊ |
| 1216 | #endif␍␊ |
| 1217 | ␍␊ |
| 1218 | #ifdef PNG_READ_pCAL_SUPPORTED␍␊ |
| 1219 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1220 | png_uint_32 length));␍␊ |
| 1221 | #endif␍␊ |
| 1222 | ␍␊ |
| 1223 | #ifdef PNG_READ_pHYs_SUPPORTED␍␊ |
| 1224 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1225 | png_uint_32 length));␍␊ |
| 1226 | #endif␍␊ |
| 1227 | ␍␊ |
| 1228 | #ifdef PNG_READ_sBIT_SUPPORTED␍␊ |
| 1229 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1230 | png_uint_32 length));␍␊ |
| 1231 | #endif␍␊ |
| 1232 | ␍␊ |
| 1233 | #ifdef PNG_READ_sCAL_SUPPORTED␍␊ |
| 1234 | PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1235 | png_uint_32 length));␍␊ |
| 1236 | #endif␍␊ |
| 1237 | ␍␊ |
| 1238 | #ifdef PNG_READ_sPLT_SUPPORTED␍␊ |
| 1239 | PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1240 | png_uint_32 length));␍␊ |
| 1241 | #endif /* PNG_READ_sPLT_SUPPORTED */␍␊ |
| 1242 | ␍␊ |
| 1243 | #ifdef PNG_READ_sRGB_SUPPORTED␍␊ |
| 1244 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1245 | png_uint_32 length));␍␊ |
| 1246 | #endif␍␊ |
| 1247 | ␍␊ |
| 1248 | #ifdef PNG_READ_tEXt_SUPPORTED␍␊ |
| 1249 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1250 | png_uint_32 length));␍␊ |
| 1251 | #endif␍␊ |
| 1252 | ␍␊ |
| 1253 | #ifdef PNG_READ_tIME_SUPPORTED␍␊ |
| 1254 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1255 | png_uint_32 length));␍␊ |
| 1256 | #endif␍␊ |
| 1257 | ␍␊ |
| 1258 | #ifdef PNG_READ_tRNS_SUPPORTED␍␊ |
| 1259 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1260 | png_uint_32 length));␍␊ |
| 1261 | #endif␍␊ |
| 1262 | ␍␊ |
| 1263 | #ifdef PNG_READ_zTXt_SUPPORTED␍␊ |
| 1264 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,␍␊ |
| 1265 | png_uint_32 length));␍␊ |
| 1266 | #endif␍␊ |
| 1267 | ␍␊ |
| 1268 | PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,␍␊ |
| 1269 | png_infop info_ptr, png_uint_32 length));␍␊ |
| 1270 | ␍␊ |
| 1271 | PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,␍␊ |
| 1272 | png_uint_32 chunk_name));␍␊ |
| 1273 | ␍␊ |
| 1274 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED␍␊ |
| 1275 | /* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk␍␊ |
| 1276 | * name, not a string.␍␊ |
| 1277 | */␍␊ |
| 1278 | PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr,␍␊ |
| 1279 | png_uint_32 chunk_name));␍␊ |
| 1280 | #endif␍␊ |
| 1281 | ␍␊ |
| 1282 | /* Handle the transformations for reading and writing */␍␊ |
| 1283 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED␍␊ |
| 1284 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr,␍␊ |
| 1285 | png_row_infop row_info));␍␊ |
| 1286 | #endif␍␊ |
| 1287 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED␍␊ |
| 1288 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr,␍␊ |
| 1289 | png_row_infop row_info));␍␊ |
| 1290 | #endif␍␊ |
| 1291 | ␍␊ |
| 1292 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED␍␊ |
| 1293 | PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));␍␊ |
| 1294 | #endif␍␊ |
| 1295 | ␍␊ |
| 1296 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED␍␊ |
| 1297 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,␍␊ |
| 1298 | png_infop info_ptr));␍␊ |
| 1299 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,␍␊ |
| 1300 | png_infop info_ptr));␍␊ |
| 1301 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));␍␊ |
| 1302 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,␍␊ |
| 1303 | png_uint_32 length));␍␊ |
| 1304 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));␍␊ |
| 1305 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));␍␊ |
| 1306 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,␍␊ |
| 1307 | png_bytep buffer, png_size_t buffer_length));␍␊ |
| 1308 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));␍␊ |
| 1309 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,␍␊ |
| 1310 | png_bytep buffer, png_size_t buffer_length));␍␊ |
| 1311 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));␍␊ |
| 1312 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,␍␊ |
| 1313 | png_infop info_ptr, png_uint_32 length));␍␊ |
| 1314 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,␍␊ |
| 1315 | png_infop info_ptr));␍␊ |
| 1316 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,␍␊ |
| 1317 | png_infop info_ptr));␍␊ |
| 1318 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));␍␊ |
| 1319 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,␍␊ |
| 1320 | png_infop info_ptr));␍␊ |
| 1321 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,␍␊ |
| 1322 | png_infop info_ptr));␍␊ |
| 1323 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));␍␊ |
| 1324 | # ifdef PNG_READ_tEXt_SUPPORTED␍␊ |
| 1325 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,␍␊ |
| 1326 | png_infop info_ptr, png_uint_32 length));␍␊ |
| 1327 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,␍␊ |
| 1328 | png_infop info_ptr));␍␊ |
| 1329 | # endif␍␊ |
| 1330 | # ifdef PNG_READ_zTXt_SUPPORTED␍␊ |
| 1331 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,␍␊ |
| 1332 | png_infop info_ptr, png_uint_32 length));␍␊ |
| 1333 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,␍␊ |
| 1334 | png_infop info_ptr));␍␊ |
| 1335 | # endif␍␊ |
| 1336 | # ifdef PNG_READ_iTXt_SUPPORTED␍␊ |
| 1337 | PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,␍␊ |
| 1338 | png_infop info_ptr, png_uint_32 length));␍␊ |
| 1339 | PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,␍␊ |
| 1340 | png_infop info_ptr));␍␊ |
| 1341 | # endif␍␊ |
| 1342 | ␍␊ |
| 1343 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */␍␊ |
| 1344 | ␍␊ |
| 1345 | #ifdef PNG_MNG_FEATURES_SUPPORTED␍␊ |
| 1346 | PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,␍␊ |
| 1347 | png_bytep row));␍␊ |
| 1348 | PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,␍␊ |
| 1349 | png_bytep row));␍␊ |
| 1350 | #endif␍␊ |
| 1351 | ␍␊ |
| 1352 | /* Added at libpng version 1.4.0 */␍␊ |
| 1353 | #ifdef PNG_CHECK_cHRM_SUPPORTED␍␊ |
| 1354 | PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,␍␊ |
| 1355 | png_fixed_point int_white_x, png_fixed_point int_white_y,␍␊ |
| 1356 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point␍␊ |
| 1357 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,␍␊ |
| 1358 | png_fixed_point int_blue_y));␍␊ |
| 1359 | #endif␍␊ |
| 1360 | ␍␊ |
| 1361 | #ifdef PNG_CHECK_cHRM_SUPPORTED␍␊ |
| 1362 | /* Added at libpng version 1.2.34 and 1.4.0 */␍␊ |
| 1363 | /* Currently only used by png_check_cHRM_fixed */␍␊ |
| 1364 | PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,␍␊ |
| 1365 | unsigned long *hi_product, unsigned long *lo_product));␍␊ |
| 1366 | #endif␍␊ |
| 1367 | ␍␊ |
| 1368 | #ifdef PNG_cHRM_SUPPORTED␍␊ |
| 1369 | /* Added at libpng version 1.5.5 */␍␊ |
| 1370 | typedef struct png_xy␍␊ |
| 1371 | {␍␊ |
| 1372 | png_fixed_point redx, redy;␍␊ |
| 1373 | png_fixed_point greenx, greeny;␍␊ |
| 1374 | png_fixed_point bluex, bluey;␍␊ |
| 1375 | png_fixed_point whitex, whitey;␍␊ |
| 1376 | } png_xy;␍␊ |
| 1377 | ␍␊ |
| 1378 | typedef struct png_XYZ␍␊ |
| 1379 | {␍␊ |
| 1380 | png_fixed_point redX, redY, redZ;␍␊ |
| 1381 | png_fixed_point greenX, greenY, greenZ;␍␊ |
| 1382 | png_fixed_point blueX, blueY, blueZ;␍␊ |
| 1383 | } png_XYZ;␍␊ |
| 1384 | ␍␊ |
| 1385 | /* The conversion APIs return 0 on success, non-zero on a parameter error. They␍␊ |
| 1386 | * allow conversion between the above representations of a color encoding. When␍␊ |
| 1387 | * converting from XYZ end points to chromaticities the absolute magnitude of␍␊ |
| 1388 | * the end points is lost, when converting back the sum of the Y values of the␍␊ |
| 1389 | * three end points will be 1.0␍␊ |
| 1390 | */␍␊ |
| 1391 | PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ));␍␊ |
| 1392 | PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy));␍␊ |
| 1393 | PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr,␍␊ |
| 1394 | png_XYZ *XYZ, png_xy xy));␍␊ |
| 1395 | #endif␍␊ |
| 1396 | ␍␊ |
| 1397 | /* Added at libpng version 1.4.0 */␍␊ |
| 1398 | PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,␍␊ |
| 1399 | png_uint_32 width, png_uint_32 height, int bit_depth,␍␊ |
| 1400 | int color_type, int interlace_type, int compression_type,␍␊ |
| 1401 | int filter_type));␍␊ |
| 1402 | ␍␊ |
| 1403 | /* Added at libpng version 1.5.10 */␍␊ |
| 1404 | #if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \␍␊ |
| 1405 | defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)␍␊ |
| 1406 | PNG_EXTERN void png_do_check_palette_indexes PNGARG((png_structp png_ptr,␍␊ |
| 1407 | png_row_infop row_info));␍␊ |
| 1408 | #endif␍␊ |
| 1409 | ␍␊ |
| 1410 | /* Free all memory used by the read (old method - NOT DLL EXPORTED) */␍␊ |
| 1411 | PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr,␍␊ |
| 1412 | png_infop info_ptr, png_infop end_info_ptr));␍␊ |
| 1413 | ␍␊ |
| 1414 | /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */␍␊ |
| 1415 | PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr));␍␊ |
| 1416 | ␍␊ |
| 1417 | #ifdef USE_FAR_KEYWORD /* memory model conversion function */␍␊ |
| 1418 | PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr,␍␊ |
| 1419 | int check));␍␊ |
| 1420 | #endif /* USE_FAR_KEYWORD */␍␊ |
| 1421 | ␍␊ |
| 1422 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED)␍␊ |
| 1423 | PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr,␍␊ |
| 1424 | png_const_charp name),PNG_NORETURN);␍␊ |
| 1425 | #endif␍␊ |
| 1426 | ␍␊ |
| 1427 | /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite␍␊ |
| 1428 | * the end. Always leaves the buffer nul terminated. Never errors out (and␍␊ |
| 1429 | * there is no error code.)␍␊ |
| 1430 | */␍␊ |
| 1431 | PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos,␍␊ |
| 1432 | png_const_charp string);␍␊ |
| 1433 | ␍␊ |
| 1434 | /* Various internal functions to handle formatted warning messages, currently␍␊ |
| 1435 | * only implemented for warnings.␍␊ |
| 1436 | */␍␊ |
| 1437 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED)␍␊ |
| 1438 | /* Utility to dump an unsigned value into a buffer, given a start pointer and␍␊ |
| 1439 | * and end pointer (which should point just *beyond* the end of the buffer!)␍␊ |
| 1440 | * Returns the pointer to the start of the formatted string. This utility only␍␊ |
| 1441 | * does unsigned values.␍␊ |
| 1442 | */␍␊ |
| 1443 | PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end,␍␊ |
| 1444 | int format, png_alloc_size_t number);␍␊ |
| 1445 | ␍␊ |
| 1446 | /* Convenience macro that takes an array: */␍␊ |
| 1447 | #define PNG_FORMAT_NUMBER(buffer,format,number) \␍␊ |
| 1448 | png_format_number(buffer, buffer + (sizeof buffer), format, number)␍␊ |
| 1449 | ␍␊ |
| 1450 | /* Suggested size for a number buffer (enough for 64 bits and a sign!) */␍␊ |
| 1451 | #define PNG_NUMBER_BUFFER_SIZE 24␍␊ |
| 1452 | ␍␊ |
| 1453 | /* These are the integer formats currently supported, the name is formed from␍␊ |
| 1454 | * the standard printf(3) format string.␍␊ |
| 1455 | */␍␊ |
| 1456 | #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */␍␊ |
| 1457 | #define PNG_NUMBER_FORMAT_02u 2␍␊ |
| 1458 | #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */␍␊ |
| 1459 | #define PNG_NUMBER_FORMAT_02d 2␍␊ |
| 1460 | #define PNG_NUMBER_FORMAT_x 3␍␊ |
| 1461 | #define PNG_NUMBER_FORMAT_02x 4␍␊ |
| 1462 | #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */␍␊ |
| 1463 | #endif␍␊ |
| 1464 | ␍␊ |
| 1465 | #ifdef PNG_WARNINGS_SUPPORTED␍␊ |
| 1466 | /* New defines and members adding in libpng-1.5.4 */␍␊ |
| 1467 | # define PNG_WARNING_PARAMETER_SIZE 32␍␊ |
| 1468 | # define PNG_WARNING_PARAMETER_COUNT 8␍␊ |
| 1469 | ␍␊ |
| 1470 | /* An l-value of this type has to be passed to the APIs below to cache the␍␊ |
| 1471 | * values of the parameters to a formatted warning message.␍␊ |
| 1472 | */␍␊ |
| 1473 | typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][␍␊ |
| 1474 | PNG_WARNING_PARAMETER_SIZE];␍␊ |
| 1475 | ␍␊ |
| 1476 | PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number,␍␊ |
| 1477 | png_const_charp string);␍␊ |
| 1478 | /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters,␍␊ |
| 1479 | * including the trailing '\0'.␍␊ |
| 1480 | */␍␊ |
| 1481 | PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p,␍␊ |
| 1482 | int number, int format, png_alloc_size_t value);␍␊ |
| 1483 | /* Use png_alloc_size_t because it is an unsigned type as big as any we␍␊ |
| 1484 | * need to output. Use the following for a signed value.␍␊ |
| 1485 | */␍␊ |
| 1486 | PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p,␍␊ |
| 1487 | int number, int format, png_int_32 value);␍␊ |
| 1488 | ␍␊ |
| 1489 | PNG_EXTERN void png_formatted_warning(png_structp png_ptr,␍␊ |
| 1490 | png_warning_parameters p, png_const_charp message);␍␊ |
| 1491 | /* 'message' follows the X/Open approach of using @1, @2 to insert␍␊ |
| 1492 | * parameters previously supplied using the above functions. Errors in␍␊ |
| 1493 | * specifying the paramters will simple result in garbage substitutions.␍␊ |
| 1494 | */␍␊ |
| 1495 | #endif␍␊ |
| 1496 | ␍␊ |
| 1497 | /* ASCII to FP interfaces, currently only implemented if sCAL␍␊ |
| 1498 | * support is required.␍␊ |
| 1499 | */␍␊ |
| 1500 | #if defined(PNG_READ_sCAL_SUPPORTED)␍␊ |
| 1501 | /* MAX_DIGITS is actually the maximum number of characters in an sCAL␍␊ |
| 1502 | * width or height, derived from the precision (number of significant␍␊ |
| 1503 | * digits - a build time settable option) and assumpitions about the␍␊ |
| 1504 | * maximum ridiculous exponent.␍␊ |
| 1505 | */␍␊ |
| 1506 | #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/)␍␊ |
| 1507 | ␍␊ |
| 1508 | #ifdef PNG_FLOATING_POINT_SUPPORTED␍␊ |
| 1509 | PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii,␍␊ |
| 1510 | png_size_t size, double fp, unsigned int precision));␍␊ |
| 1511 | #endif /* FLOATING_POINT */␍␊ |
| 1512 | ␍␊ |
| 1513 | #ifdef PNG_FIXED_POINT_SUPPORTED␍␊ |
| 1514 | PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr,␍␊ |
| 1515 | png_charp ascii, png_size_t size, png_fixed_point fp));␍␊ |
| 1516 | #endif /* FIXED_POINT */␍␊ |
| 1517 | #endif /* READ_sCAL */␍␊ |
| 1518 | ␍␊ |
| 1519 | #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)␍␊ |
| 1520 | /* An internal API to validate the format of a floating point number.␍␊ |
| 1521 | * The result is the index of the next character. If the number is␍␊ |
| 1522 | * not valid it will be the index of a character in the supposed number.␍␊ |
| 1523 | *␍␊ |
| 1524 | * The format of a number is defined in the PNG extensions specification␍␊ |
| 1525 | * and this API is strictly conformant to that spec, not anyone elses!␍␊ |
| 1526 | *␍␊ |
| 1527 | * The format as a regular expression is:␍␊ |
| 1528 | *␍␊ |
| 1529 | * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)?␍␊ |
| 1530 | *␍␊ |
| 1531 | * or:␍␊ |
| 1532 | *␍␊ |
| 1533 | * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)?␍␊ |
| 1534 | *␍␊ |
| 1535 | * The complexity is that either integer or fraction must be present and the␍␊ |
| 1536 | * fraction is permitted to have no digits only if the integer is present.␍␊ |
| 1537 | *␍␊ |
| 1538 | * NOTE: The dangling E problem.␍␊ |
| 1539 | * There is a PNG valid floating point number in the following:␍␊ |
| 1540 | *␍␊ |
| 1541 | * PNG floating point numb1.ers are not greedy.␍␊ |
| 1542 | *␍␊ |
| 1543 | * Working this out requires *TWO* character lookahead (because of the␍␊ |
| 1544 | * sign), the parser does not do this - it will fail at the 'r' - this␍␊ |
| 1545 | * doesn't matter for PNG sCAL chunk values, but it requires more care␍␊ |
| 1546 | * if the value were ever to be embedded in something more complex. Use␍␊ |
| 1547 | * ANSI-C strtod if you need the lookahead.␍␊ |
| 1548 | */␍␊ |
| 1549 | /* State table for the parser. */␍␊ |
| 1550 | #define PNG_FP_INTEGER 0 /* before or in integer */␍␊ |
| 1551 | #define PNG_FP_FRACTION 1 /* before or in fraction */␍␊ |
| 1552 | #define PNG_FP_EXPONENT 2 /* before or in exponent */␍␊ |
| 1553 | #define PNG_FP_STATE 3 /* mask for the above */␍␊ |
| 1554 | #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */␍␊ |
| 1555 | #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */␍␊ |
| 1556 | #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */␍␊ |
| 1557 | #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */␍␊ |
| 1558 | #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */␍␊ |
| 1559 | ␍␊ |
| 1560 | /* These three values don't affect the parser. They are set but not used.␍␊ |
| 1561 | */␍␊ |
| 1562 | #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */␍␊ |
| 1563 | #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */␍␊ |
| 1564 | #define PNG_FP_NONZERO 256 /* A non-zero value */␍␊ |
| 1565 | #define PNG_FP_STICKY 448 /* The above three flags */␍␊ |
| 1566 | ␍␊ |
| 1567 | /* This is available for the caller to store in 'state' if required. Do not␍␊ |
| 1568 | * call the parser after setting it (the parser sometimes clears it.)␍␊ |
| 1569 | */␍␊ |
| 1570 | #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */␍␊ |
| 1571 | ␍␊ |
| 1572 | /* Result codes for the parser (boolean - true meants ok, false means␍␊ |
| 1573 | * not ok yet.)␍␊ |
| 1574 | */␍␊ |
| 1575 | #define PNG_FP_MAYBE 0 /* The number may be valid in the future */␍␊ |
| 1576 | #define PNG_FP_OK 1 /* The number is valid */␍␊ |
| 1577 | ␍␊ |
| 1578 | /* Tests on the sticky non-zero and negative flags. To pass these checks␍␊ |
| 1579 | * the state must also indicate that the whole number is valid - this is␍␊ |
| 1580 | * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this␍␊ |
| 1581 | * is equivalent to PNG_FP_OK above.)␍␊ |
| 1582 | */␍␊ |
| 1583 | #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO)␍␊ |
| 1584 | /* NZ_MASK: the string is valid and a non-zero negative value */␍␊ |
| 1585 | #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO)␍␊ |
| 1586 | /* Z MASK: the string is valid and a non-zero value. */␍␊ |
| 1587 | /* PNG_FP_SAW_DIGIT: the string is valid. */␍␊ |
| 1588 | #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT)␍␊ |
| 1589 | #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK)␍␊ |
| 1590 | #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK)␍␊ |
| 1591 | ␍␊ |
| 1592 | /* The actual parser. This can be called repeatedly, it updates␍␊ |
| 1593 | * the index into the string and the state variable (which must␍␊ |
| 1594 | * be initialzed to 0). It returns a result code, as above. There␍␊ |
| 1595 | * is no point calling the parser any more if it fails to advance to␍␊ |
| 1596 | * the end of the string - it is stuck on an invalid character (or␍␊ |
| 1597 | * terminated by '\0').␍␊ |
| 1598 | *␍␊ |
| 1599 | * Note that the pointer will consume an E or even an E+ then leave␍␊ |
| 1600 | * a 'maybe' state even though a preceding integer.fraction is valid.␍␊ |
| 1601 | * The PNG_FP_WAS_VALID flag indicates that a preceding substring was␍␊ |
| 1602 | * a valid number. It's possible to recover from this by calling␍␊ |
| 1603 | * the parser again (from the start, with state 0) but with a string␍␊ |
| 1604 | * that omits the last character (i.e. set the size to the index of␍␊ |
| 1605 | * the problem character.) This has not been tested within libpng.␍␊ |
| 1606 | */␍␊ |
| 1607 | PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string,␍␊ |
| 1608 | png_size_t size, int *statep, png_size_tp whereami));␍␊ |
| 1609 | ␍␊ |
| 1610 | /* This is the same but it checks a complete string and returns true␍␊ |
| 1611 | * only if it just contains a floating point number. As of 1.5.4 this␍␊ |
| 1612 | * function also returns the state at the end of parsing the number if␍␊ |
| 1613 | * it was valid (otherwise it returns 0.) This can be used for testing␍␊ |
| 1614 | * for negative or zero values using the sticky flag.␍␊ |
| 1615 | */␍␊ |
| 1616 | PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string,␍␊ |
| 1617 | png_size_t size));␍␊ |
| 1618 | #endif /* pCAL || sCAL */␍␊ |
| 1619 | ␍␊ |
| 1620 | #if defined(PNG_READ_GAMMA_SUPPORTED) ||\␍␊ |
| 1621 | defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED)␍␊ |
| 1622 | /* Added at libpng version 1.5.0 */␍␊ |
| 1623 | /* This is a utility to provide a*times/div (rounded) and indicate␍␊ |
| 1624 | * if there is an overflow. The result is a boolean - false (0)␍␊ |
| 1625 | * for overflow, true (1) if no overflow, in which case *res␍␊ |
| 1626 | * holds the result.␍␊ |
| 1627 | */␍␊ |
| 1628 | PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a,␍␊ |
| 1629 | png_int_32 multiplied_by, png_int_32 divided_by));␍␊ |
| 1630 | #endif␍␊ |
| 1631 | ␍␊ |
| 1632 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)␍␊ |
| 1633 | /* Same deal, but issue a warning on overflow and return 0. */␍␊ |
| 1634 | PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr,␍␊ |
| 1635 | png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by));␍␊ |
| 1636 | #endif␍␊ |
| 1637 | ␍␊ |
| 1638 | #ifdef PNG_READ_GAMMA_SUPPORTED␍␊ |
| 1639 | /* Calculate a reciprocal - used for gamma values. This returns␍␊ |
| 1640 | * 0 if the argument is 0 in order to maintain an undefined value,␍␊ |
| 1641 | * there are no warnings.␍␊ |
| 1642 | */␍␊ |
| 1643 | PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a));␍␊ |
| 1644 | ␍␊ |
| 1645 | /* The same but gives a reciprocal of the product of two fixed point␍␊ |
| 1646 | * values. Accuracy is suitable for gamma calculations but this is␍␊ |
| 1647 | * not exact - use png_muldiv for that.␍␊ |
| 1648 | */␍␊ |
| 1649 | PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a,␍␊ |
| 1650 | png_fixed_point b));␍␊ |
| 1651 | #endif␍␊ |
| 1652 | ␍␊ |
| 1653 | #ifdef PNG_READ_GAMMA_SUPPORTED␍␊ |
| 1654 | /* Internal fixed point gamma correction. These APIs are called as␍␊ |
| 1655 | * required to convert single values - they don't need to be fast,␍␊ |
| 1656 | * they are not used when processing image pixel values.␍␊ |
| 1657 | *␍␊ |
| 1658 | * While the input is an 'unsigned' value it must actually be the␍␊ |
| 1659 | * correct bit value - 0..255 or 0..65535 as required.␍␊ |
| 1660 | */␍␊ |
| 1661 | PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr,␍␊ |
| 1662 | unsigned int value, png_fixed_point gamma_value));␍␊ |
| 1663 | PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value));␍␊ |
| 1664 | PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,␍␊ |
| 1665 | png_fixed_point gamma_value));␍␊ |
| 1666 | PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,␍␊ |
| 1667 | png_fixed_point gamma_value));␍␊ |
| 1668 | PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr);␍␊ |
| 1669 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,␍␊ |
| 1670 | int bit_depth));␍␊ |
| 1671 | #endif␍␊ |
| 1672 | ␍␊ |
| 1673 | /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */␍␊ |
| 1674 | ␍␊ |
| 1675 | #include "pngdebug.h"␍␊ |
| 1676 | ␍␊ |
| 1677 | #ifdef __cplusplus␍␊ |
| 1678 | }␍␊ |
| 1679 | #endif␍␊ |
| 1680 | ␍␊ |
| 1681 | #endif /* PNGPRIV_H */␍␊ |
| 1682 | |
