| | 1 | /* pngpriv.h - private declarations for use inside libpng |
| | 2 | * |
| | 3 | * For conditions of distribution and use, see copyright notice in png.h |
| | 4 | * Copyright (c) 1998-2011 Glenn Randers-Pehrson |
| | 5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| | 6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| | 7 | * |
| | 8 | * Last changed in libpng 1.5.7 [December 15, 2011] |
| | 9 | * |
| | 10 | * This code is released under the libpng license. |
| | 11 | * For conditions of distribution and use, see the disclaimer |
| | 12 | * and license in png.h |
| | 13 | */ |
| | 14 | |
| | 15 | /* The symbols declared in this file (including the functions declared |
| | 16 | * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public |
| | 17 | * interface, and are not recommended for use by regular applications. |
| | 18 | * Some of them may become public in the future; others may stay private, |
| | 19 | * change in an incompatible way, or even disappear. |
| | 20 | * Although the libpng users are not forbidden to include this header, |
| | 21 | * they should be well aware of the issues that may arise from doing so. |
| | 22 | */ |
| | 23 | |
| | 24 | #ifndef PNGPRIV_H |
| | 25 | #define PNGPRIV_H |
| | 26 | |
| | 27 | /* Feature Test Macros. The following are defined here to ensure that correctly |
| | 28 | * implemented libraries reveal the APIs libpng needs to build and hide those |
| | 29 | * that are not needed and potentially damaging to the compilation. |
| | 30 | * |
| | 31 | * Feature Test Macros must be defined before any system header is included (see |
| | 32 | * POSIX 1003.1 2.8.2 "POSIX Symbols." |
| | 33 | * |
| | 34 | * These macros only have an effect if the operating system supports either |
| | 35 | * POSIX 1003.1 or C99, or both. On other operating systems (particularly |
| | 36 | * Windows/Visual Studio) there is no effect; the OS specific tests below are |
| | 37 | * still required (as of 2011-05-02.) |
| | 38 | */ |
| | 39 | #define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */ |
| | 40 | |
| | 41 | /* This is required for the definition of abort(), used as a last ditch |
| | 42 | * error handler when all else fails. |
| | 43 | */ |
| | 44 | #include <stdlib.h> |
| | 45 | |
| | 46 | /* This is used to find 'offsetof', used below for alignment tests. */ |
| | 47 | #include <stddef.h> |
| | 48 | |
| | 49 | #define PNGLIB_BUILD /*libpng is being built, not used*/ |
| | 50 | |
| | 51 | #ifdef PNG_USER_CONFIG |
| | 52 | # include "pngusr.h" |
| | 53 | /* These should have been defined in pngusr.h */ |
| | 54 | # ifndef PNG_USER_PRIVATEBUILD |
| | 55 | # define PNG_USER_PRIVATEBUILD "Custom libpng build" |
| | 56 | # endif |
| | 57 | # ifndef PNG_USER_DLLFNAME_POSTFIX |
| | 58 | # define PNG_USER_DLLFNAME_POSTFIX "Cb" |
| | 59 | # endif |
| | 60 | #endif |
| | 61 | |
| | 62 | /* Is this a build of a DLL where compilation of the object modules requires |
| | 63 | * different preprocessor settings to those required for a simple library? If |
| | 64 | * so PNG_BUILD_DLL must be set. |
| | 65 | * |
| | 66 | * If libpng is used inside a DLL but that DLL does not export the libpng APIs |
| | 67 | * PNG_BUILD_DLL must not be set. To avoid the code below kicking in build a |
| | 68 | * static library of libpng then link the DLL against that. |
| | 69 | */ |
| | 70 | #ifndef PNG_BUILD_DLL |
| | 71 | # ifdef DLL_EXPORT |
| | 72 | /* This is set by libtool when files are compiled for a DLL; libtool |
| | 73 | * always compiles twice, even on systems where it isn't necessary. Set |
| | 74 | * PNG_BUILD_DLL in case it is necessary: |
| | 75 | */ |
| | 76 | # define PNG_BUILD_DLL |
| | 77 | # else |
| | 78 | # ifdef _WINDLL |
| | 79 | /* This is set by the Microsoft Visual Studio IDE in projects that |
| | 80 | * build a DLL. It can't easily be removed from those projects (it |
| | 81 | * isn't visible in the Visual Studio UI) so it is a fairly reliable |
| | 82 | * indication that PNG_IMPEXP needs to be set to the DLL export |
| | 83 | * attributes. |
| | 84 | */ |
| | 85 | # define PNG_BUILD_DLL |
| | 86 | # else |
| | 87 | # ifdef __DLL__ |
| | 88 | /* This is set by the Borland C system when compiling for a DLL |
| | 89 | * (as above.) |
| | 90 | */ |
| | 91 | # define PNG_BUILD_DLL |
| | 92 | # else |
| | 93 | /* Add additional compiler cases here. */ |
| | 94 | # endif |
| | 95 | # endif |
| | 96 | # endif |
| | 97 | #endif /* Setting PNG_BUILD_DLL if required */ |
| | 98 | |
| | 99 | /* See pngconf.h for more details: the builder of the library may set this on |
| | 100 | * the command line to the right thing for the specific compilation system or it |
| | 101 | * may be automagically set above (at present we know of no system where it does |
| | 102 | * need to be set on the command line.) |
| | 103 | * |
| | 104 | * PNG_IMPEXP must be set here when building the library to prevent pngconf.h |
| | 105 | * setting it to the "import" setting for a DLL build. |
| | 106 | */ |
| | 107 | #ifndef PNG_IMPEXP |
| | 108 | # ifdef PNG_BUILD_DLL |
| | 109 | # define PNG_IMPEXP PNG_DLL_EXPORT |
| | 110 | # else |
| | 111 | /* Not building a DLL, or the DLL doesn't require specific export |
| | 112 | * definitions. |
| | 113 | */ |
| | 114 | # define PNG_IMPEXP |
| | 115 | # endif |
| | 116 | #endif |
| | 117 | |
| | 118 | /* No warnings for private or deprecated functions in the build: */ |
| | 119 | #ifndef PNG_DEPRECATED |
| | 120 | # define PNG_DEPRECATED |
| | 121 | #endif |
| | 122 | #ifndef PNG_PRIVATE |
| | 123 | # define PNG_PRIVATE |
| | 124 | #endif |
| | 125 | |
| | 126 | #include "png.h" |
| | 127 | #include "pnginfo.h" |
| | 128 | #include "pngstruct.h" |
| | 129 | |
| | 130 | /* pngconf.h does not set PNG_DLL_EXPORT unless it is required, so: */ |
| | 131 | #ifndef PNG_DLL_EXPORT |
| | 132 | # define PNG_DLL_EXPORT |
| | 133 | #endif |
| | 134 | |
| | 135 | /* This is used for 16 bit gamma tables - only the top level pointers are const, |
| | 136 | * this could be changed: |
| | 137 | */ |
| | 138 | typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp; |
| | 139 | |
| | 140 | /* Added at libpng-1.2.9 */ |
| | 141 | /* Moved to pngpriv.h at libpng-1.5.0 */ |
| | 142 | |
| | 143 | /* config.h is created by and PNG_CONFIGURE_LIBPNG is set by the "configure" |
| | 144 | * script. We may need it here to get the correct configuration on things |
| | 145 | * like limits. |
| | 146 | */ |
| | 147 | #ifdef PNG_CONFIGURE_LIBPNG |
| | 148 | # ifdef HAVE_CONFIG_H |
| | 149 | # include "config.h" |
| | 150 | # endif |
| | 151 | #endif |
| | 152 | |
| | 153 | /* Moved to pngpriv.h at libpng-1.5.0 */ |
| | 154 | /* NOTE: some of these may have been used in external applications as |
| | 155 | * these definitions were exposed in pngconf.h prior to 1.5. |
| | 156 | */ |
| | 157 | |
| | 158 | /* If you are running on a machine where you cannot allocate more |
| | 159 | * than 64K of memory at once, uncomment this. While libpng will not |
| | 160 | * normally need that much memory in a chunk (unless you load up a very |
| | 161 | * large file), zlib needs to know how big of a chunk it can use, and |
| | 162 | * libpng thus makes sure to check any memory allocation to verify it |
| | 163 | * will fit into memory. |
| | 164 | * |
| | 165 | * zlib provides 'MAXSEG_64K' which, if defined, indicates the |
| | 166 | * same limit and pngconf.h (already included) sets the limit |
| | 167 | * if certain operating systems are detected. |
| | 168 | */ |
| | 169 | #if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K) |
| | 170 | # define PNG_MAX_MALLOC_64K |
| | 171 | #endif |
| | 172 | |
| | 173 | #ifndef PNG_UNUSED |
| | 174 | /* Unused formal parameter warnings are silenced using the following macro |
| | 175 | * which is expected to have no bad effects on performance (optimizing |
| | 176 | * compilers will probably remove it entirely). Note that if you replace |
| | 177 | * it with something other than whitespace, you must include the terminating |
| | 178 | * semicolon. |
| | 179 | */ |
| | 180 | # define PNG_UNUSED(param) (void)param; |
| | 181 | #endif |
| | 182 | |
| | 183 | /* Just a little check that someone hasn't tried to define something |
| | 184 | * contradictory. |
| | 185 | */ |
| | 186 | #if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K) |
| | 187 | # undef PNG_ZBUF_SIZE |
| | 188 | # define PNG_ZBUF_SIZE 65536L |
| | 189 | #endif |
| | 190 | |
| | 191 | /* PNG_STATIC is used to mark internal file scope functions if they need to be |
| | 192 | * accessed for implementation tests (see the code in tests/?*). |
| | 193 | */ |
| | 194 | #ifndef PNG_STATIC |
| | 195 | # define PNG_STATIC static |
| | 196 | #endif |
| | 197 | |
| | 198 | /* C99 restrict is used where possible, to do this 'restrict' is defined as |
| | 199 | * empty if we can't be sure it is supported. configure builds have already |
| | 200 | * done this work. |
| | 201 | */ |
| | 202 | #ifdef PNG_CONFIGURE_LIBPNG |
| | 203 | # define PNG_RESTRICT restrict |
| | 204 | #else |
| | 205 | /* Modern compilers support restrict, but assume not for anything not |
| | 206 | * recognized here: |
| | 207 | */ |
| | 208 | # if defined __GNUC__ || defined _MSC_VER || defined __WATCOMC__ |
| | 209 | # define PNG_RESTRICT restrict |
| | 210 | # else |
| | 211 | # define PNG_RESTRICT |
| | 212 | # endif |
| | 213 | #endif |
| | 214 | |
| | 215 | /* If warnings or errors are turned off the code is disabled or redirected here. |
| | 216 | * From 1.5.4 functions have been added to allow very limited formatting of |
| | 217 | * error and warning messages - this code will also be disabled here. |
| | 218 | */ |
| | 219 | #ifdef PNG_WARNINGS_SUPPORTED |
| | 220 | # define PNG_WARNING_PARAMETERS(p) png_warning_parameters p; |
| | 221 | #else |
| | 222 | # define png_warning(s1,s2) ((void)(s1)) |
| | 223 | # define png_chunk_warning(s1,s2) ((void)(s1)) |
| | 224 | # define png_warning_parameter(p,number,string) ((void)0) |
| | 225 | # define png_warning_parameter_unsigned(p,number,format,value) ((void)0) |
| | 226 | # define png_warning_parameter_signed(p,number,format,value) ((void)0) |
| | 227 | # define png_formatted_warning(pp,p,message) ((void)(pp)) |
| | 228 | # define PNG_WARNING_PARAMETERS(p) |
| | 229 | #endif |
| | 230 | #ifndef PNG_ERROR_TEXT_SUPPORTED |
| | 231 | # define png_error(s1,s2) png_err(s1) |
| | 232 | # define png_chunk_error(s1,s2) png_err(s1) |
| | 233 | # define png_fixed_error(s1,s2) png_err(s1) |
| | 234 | #endif |
| | 235 | |
| | 236 | /* C allows up-casts from (void*) to any pointer and (const void*) to any |
| | 237 | * pointer to a const object. C++ regards this as a type error and requires an |
| | 238 | * explicit, static, cast and provides the static_cast<> rune to ensure that |
| | 239 | * const is not cast away. |
| | 240 | */ |
| | 241 | #ifdef __cplusplus |
| | 242 | # define png_voidcast(type, value) static_cast<type>(value) |
| | 243 | #else |
| | 244 | # define png_voidcast(type, value) (value) |
| | 245 | #endif /* __cplusplus */ |
| | 246 | |
| | 247 | #ifndef PNG_EXTERN |
| | 248 | /* The functions exported by PNG_EXTERN are internal functions, which |
| | 249 | * aren't usually used outside the library (as far as I know), so it is |
| | 250 | * debatable if they should be exported at all. In the future, when it |
| | 251 | * is possible to have run-time registry of chunk-handling functions, |
| | 252 | * some of these might be made available again. |
| | 253 | * |
| | 254 | * 1.5.7: turned the use of 'extern' back on, since it is localized to pngpriv.h |
| | 255 | * it should be safe now (it is unclear why it was turned off.) |
| | 256 | */ |
| | 257 | # define PNG_EXTERN extern |
| | 258 | #endif |
| | 259 | |
| | 260 | /* Some fixed point APIs are still required even if not exported because |
| | 261 | * they get used by the corresponding floating point APIs. This magic |
| | 262 | * deals with this: |
| | 263 | */ |
| | 264 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| | 265 | # define PNGFAPI PNGAPI |
| | 266 | #else |
| | 267 | # define PNGFAPI /* PRIVATE */ |
| | 268 | #endif |
| | 269 | |
| | 270 | /* Other defines specific to compilers can go here. Try to keep |
| | 271 | * them inside an appropriate ifdef/endif pair for portability. |
| | 272 | */ |
| | 273 | #if defined(PNG_FLOATING_POINT_SUPPORTED) ||\ |
| | 274 | defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) |
| | 275 | /* png.c requires the following ANSI-C constants if the conversion of |
| | 276 | * floating point to ASCII is implemented therein: |
| | 277 | * |
| | 278 | * DBL_DIG Maximum number of decimal digits (can be set to any constant) |
| | 279 | * DBL_MIN Smallest normalized fp number (can be set to an arbitrary value) |
| | 280 | * DBL_MAX Maximum floating point number (can be set to an arbitrary value) |
| | 281 | */ |
| | 282 | # include <float.h> |
| | 283 | |
| | 284 | # if ( ( (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \ |
| | 285 | defined(THINK_C) || defined(TARGET_OS_MAC) ) && !wxOSX_USE_IPHONE ) || defined(__SC__) |
| | 286 | /* We need to check that <math.h> hasn't already been included earlier |
| | 287 | * as it seems it doesn't agree with <fp.h>, yet we should really use |
| | 288 | * <fp.h> if possible. |
| | 289 | */ |
| | 290 | # if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) |
| | 291 | # include <fp.h> |
| | 292 | # endif |
| | 293 | # else |
| | 294 | # include <math.h> |
| | 295 | # endif |
| | 296 | # if defined(_AMIGA) && defined(__SASC) && defined(_M68881) |
| | 297 | /* Amiga SAS/C: We must include builtin FPU functions when compiling using |
| | 298 | * MATH=68881 |
| | 299 | */ |
| | 300 | # include <m68881.h> |
| | 301 | # endif |
| | 302 | #endif |
| | 303 | |
| | 304 | /* This provides the non-ANSI (far) memory allocation routines. */ |
| | 305 | #if defined(__TURBOC__) && defined(__MSDOS__) |
| | 306 | # include <mem.h> |
| | 307 | # include <alloc.h> |
| | 308 | #endif |
| | 309 | |
| | 310 | #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ |
| | 311 | defined(_WIN32) || defined(__WIN32__) |
| | 312 | # include <windows.h> /* defines _WINDOWS_ macro */ |
| | 313 | #endif |
| | 314 | |
| | 315 | /* Moved here around 1.5.0beta36 from pngconf.h */ |
| | 316 | /* Users may want to use these so they are not private. Any library |
| | 317 | * functions that are passed far data must be model-independent. |
| | 318 | */ |
| | 319 | |
| | 320 | /* Memory model/platform independent fns */ |
| | 321 | #ifndef PNG_ABORT |
| | 322 | # ifdef _WINDOWS_ |
| | 323 | # define PNG_ABORT() ExitProcess(0) |
| | 324 | # else |
| | 325 | # define PNG_ABORT() abort() |
| | 326 | # endif |
| | 327 | #endif |
| | 328 | |
| | 329 | #ifdef USE_FAR_KEYWORD |
| | 330 | /* Use this to make far-to-near assignments */ |
| | 331 | # define CHECK 1 |
| | 332 | # define NOCHECK 0 |
| | 333 | # define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK)) |
| | 334 | # define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK)) |
| | 335 | # define png_strlen _fstrlen |
| | 336 | # define png_memcmp _fmemcmp /* SJT: added */ |
| | 337 | # define png_memcpy _fmemcpy |
| | 338 | # define png_memset _fmemset |
| | 339 | #else |
| | 340 | # ifdef _WINDOWS_ /* Favor Windows over C runtime fns */ |
| | 341 | # define CVT_PTR(ptr) (ptr) |
| | 342 | # define CVT_PTR_NOCHECK(ptr) (ptr) |
| | 343 | # define png_strlen lstrlenA |
| | 344 | # define png_memcmp memcmp |
| | 345 | # define png_memcpy CopyMemory |
| | 346 | # define png_memset memset |
| | 347 | # else |
| | 348 | # define CVT_PTR(ptr) (ptr) |
| | 349 | # define CVT_PTR_NOCHECK(ptr) (ptr) |
| | 350 | # define png_strlen strlen |
| | 351 | # define png_memcmp memcmp /* SJT: added */ |
| | 352 | # define png_memcpy memcpy |
| | 353 | # define png_memset memset |
| | 354 | # endif |
| | 355 | #endif |
| | 356 | |
| | 357 | /* These macros may need to be architecture dependent. */ |
| | 358 | #define PNG_ALIGN_NONE 0 /* do not use data alignment */ |
| | 359 | #define PNG_ALIGN_ALWAYS 1 /* assume unaligned accesses are OK */ |
| | 360 | #ifdef offsetof |
| | 361 | # define PNG_ALIGN_OFFSET 2 /* use offsetof to determine alignment */ |
| | 362 | #else |
| | 363 | # define PNG_ALIGN_OFFSET -1 /* prevent the use of this */ |
| | 364 | #endif |
| | 365 | #define PNG_ALIGN_SIZE 3 /* use sizeof to determine alignment */ |
| | 366 | |
| | 367 | #ifndef PNG_ALIGN_TYPE |
| | 368 | /* Default to using aligned access optimizations and requiring alignment to a |
| | 369 | * multiple of the data type size. Override in a compiler specific fashion |
| | 370 | * if necessary by inserting tests here: |
| | 371 | */ |
| | 372 | # define PNG_ALIGN_TYPE PNG_ALIGN_SIZE |
| | 373 | #endif |
| | 374 | |
| | 375 | #if PNG_ALIGN_TYPE == PNG_ALIGN_SIZE |
| | 376 | /* This is used because in some compiler implementations non-aligned |
| | 377 | * structure members are supported, so the offsetof approach below fails. |
| | 378 | * Set PNG_ALIGN_TO_SIZE=0 for compiler combinations where unaligned access |
| | 379 | * is good for performance. Do not do this unless you have tested the result |
| | 380 | * and understand it. |
| | 381 | */ |
| | 382 | # define png_alignof(type) (sizeof (type)) |
| | 383 | #else |
| | 384 | # if PNG_ALIGN_TYPE == PNG_ALIGN_OFFSET |
| | 385 | # define png_alignof(type) offsetof(struct{char c; type t;}, t) |
| | 386 | # else |
| | 387 | # if PNG_ALIGN_TYPE == PNG_ALIGN_ALWAYS |
| | 388 | # define png_alignof(type) (1) |
| | 389 | # endif |
| | 390 | /* Else leave png_alignof undefined to prevent use thereof */ |
| | 391 | # endif |
| | 392 | #endif |
| | 393 | |
| | 394 | /* This implicitly assumes alignment is always to a power of 2. */ |
| | 395 | #ifdef png_alignof |
| | 396 | # define png_isaligned(ptr, type)\ |
| | 397 | ((((const char*)ptr-(const char*)0) & (png_alignof(type)-1)) == 0) |
| | 398 | #else |
| | 399 | # define png_isaligned(ptr, type) 0 |
| | 400 | #endif |
| | 401 | |
| | 402 | /* End of memory model/platform independent support */ |
| | 403 | /* End of 1.5.0beta36 move from pngconf.h */ |
| | 404 | |
| | 405 | /* CONSTANTS and UTILITY MACROS |
| | 406 | * These are used internally by libpng and not exposed in the API |
| | 407 | */ |
| | 408 | |
| | 409 | /* Various modes of operation. Note that after an init, mode is set to |
| | 410 | * zero automatically when the structure is created. Three of these |
| | 411 | * are defined in png.h because they need to be visible to applications |
| | 412 | * that call png_set_unknown_chunk(). |
| | 413 | */ |
| | 414 | /* #define PNG_HAVE_IHDR 0x01 (defined in png.h) */ |
| | 415 | /* #define PNG_HAVE_PLTE 0x02 (defined in png.h) */ |
| | 416 | #define PNG_HAVE_IDAT 0x04 |
| | 417 | /* #define PNG_AFTER_IDAT 0x08 (defined in png.h) */ |
| | 418 | #define PNG_HAVE_IEND 0x10 |
| | 419 | #define PNG_HAVE_gAMA 0x20 |
| | 420 | #define PNG_HAVE_cHRM 0x40 |
| | 421 | #define PNG_HAVE_sRGB 0x80 |
| | 422 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
| | 423 | #define PNG_WROTE_tIME 0x200 |
| | 424 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
| | 425 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
| | 426 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
| | 427 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
| | 428 | |
| | 429 | /* Flags for the transformations the PNG library does on the image data */ |
| | 430 | #define PNG_BGR 0x0001 |
| | 431 | #define PNG_INTERLACE 0x0002 |
| | 432 | #define PNG_PACK 0x0004 |
| | 433 | #define PNG_SHIFT 0x0008 |
| | 434 | #define PNG_SWAP_BYTES 0x0010 |
| | 435 | #define PNG_INVERT_MONO 0x0020 |
| | 436 | #define PNG_QUANTIZE 0x0040 |
| | 437 | #define PNG_COMPOSE 0x0080 /* Was PNG_BACKGROUND */ |
| | 438 | #define PNG_BACKGROUND_EXPAND 0x0100 |
| | 439 | #define PNG_EXPAND_16 0x0200 /* Added to libpng 1.5.2 */ |
| | 440 | #define PNG_16_TO_8 0x0400 /* Becomes 'chop' in 1.5.4 */ |
| | 441 | #define PNG_RGBA 0x0800 |
| | 442 | #define PNG_EXPAND 0x1000 |
| | 443 | #define PNG_GAMMA 0x2000 |
| | 444 | #define PNG_GRAY_TO_RGB 0x4000 |
| | 445 | #define PNG_FILLER 0x8000 |
| | 446 | #define PNG_PACKSWAP 0x10000 |
| | 447 | #define PNG_SWAP_ALPHA 0x20000 |
| | 448 | #define PNG_STRIP_ALPHA 0x40000 |
| | 449 | #define PNG_INVERT_ALPHA 0x80000 |
| | 450 | #define PNG_USER_TRANSFORM 0x100000 |
| | 451 | #define PNG_RGB_TO_GRAY_ERR 0x200000 |
| | 452 | #define PNG_RGB_TO_GRAY_WARN 0x400000 |
| | 453 | #define PNG_RGB_TO_GRAY 0x600000 /* two bits, RGB_TO_GRAY_ERR|WARN */ |
| | 454 | #define PNG_ENCODE_ALPHA 0x800000 /* Added to libpng-1.5.4 */ |
| | 455 | #define PNG_ADD_ALPHA 0x1000000 /* Added to libpng-1.2.7 */ |
| | 456 | #define PNG_EXPAND_tRNS 0x2000000 /* Added to libpng-1.2.9 */ |
| | 457 | #define PNG_SCALE_16_TO_8 0x4000000 /* Added to libpng-1.5.4 */ |
| | 458 | /* 0x8000000 unused */ |
| | 459 | /* 0x10000000 unused */ |
| | 460 | /* 0x20000000 unused */ |
| | 461 | /* 0x40000000 unused */ |
| | 462 | /* Flags for png_create_struct */ |
| | 463 | #define PNG_STRUCT_PNG 0x0001 |
| | 464 | #define PNG_STRUCT_INFO 0x0002 |
| | 465 | |
| | 466 | /* Scaling factor for filter heuristic weighting calculations */ |
| | 467 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| | 468 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| | 469 | |
| | 470 | /* Flags for the png_ptr->flags rather than declaring a byte for each one */ |
| | 471 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| | 472 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| | 473 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| | 474 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| | 475 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| | 476 | #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| | 477 | #define PNG_FLAG_ROW_INIT 0x0040 |
| | 478 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
| | 479 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| | 480 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| | 481 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| | 482 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
| | 483 | #define PNG_FLAG_ASSUME_sRGB 0x1000 /* Added to libpng-1.5.4 */ |
| | 484 | #define PNG_FLAG_OPTIMIZE_ALPHA 0x2000 /* Added to libpng-1.5.4 */ |
| | 485 | #define PNG_FLAG_DETECT_UNINITIALIZED 0x4000 /* Added to libpng-1.5.4 */ |
| | 486 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000 |
| | 487 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000 |
| | 488 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000 |
| | 489 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000 |
| | 490 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000 |
| | 491 | #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000 |
| | 492 | /* 0x200000 unused */ |
| | 493 | /* 0x400000 unused */ |
| | 494 | #define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000 /* Added to libpng-1.4.0 */ |
| | 495 | #define PNG_FLAG_ZTXT_CUSTOM_STRATEGY 0x1000000 /* 5 lines added */ |
| | 496 | #define PNG_FLAG_ZTXT_CUSTOM_LEVEL 0x2000000 /* to libpng-1.5.4 */ |
| | 497 | #define PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL 0x4000000 |
| | 498 | #define PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS 0x8000000 |
| | 499 | #define PNG_FLAG_ZTXT_CUSTOM_METHOD 0x10000000 |
| | 500 | /* 0x20000000 unused */ |
| | 501 | /* 0x40000000 unused */ |
| | 502 | |
| | 503 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| | 504 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| | 505 | |
| | 506 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| | 507 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
| | 508 | |
| | 509 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| | 510 | PNG_FLAG_CRC_CRITICAL_MASK) |
| | 511 | |
| | 512 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
| | 513 | * can handle at once. This type need be no larger than 16 bits (so maximum of |
| | 514 | * 65535), this define allows us to discover how big it is, but limited by the |
| | 515 | * maximuum for png_size_t. The value can be overriden in a library build |
| | 516 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
| | 517 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
| | 518 | * and may even improve performance on some systems (and degrade it on others.) |
| | 519 | */ |
| | 520 | #ifndef ZLIB_IO_MAX |
| | 521 | # define ZLIB_IO_MAX ((uInt)-1) |
| | 522 | #endif |
| | 523 | |
| | 524 | /* Save typing and make code easier to understand */ |
| | 525 | |
| | 526 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| | 527 | abs((int)((c1).green) - (int)((c2).green)) + \ |
| | 528 | abs((int)((c1).blue) - (int)((c2).blue))) |
| | 529 | |
| | 530 | /* Added to libpng-1.2.6 JB */ |
| | 531 | #define PNG_ROWBYTES(pixel_bits, width) \ |
| | 532 | ((pixel_bits) >= 8 ? \ |
| | 533 | ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ |
| | 534 | (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) |
| | 535 | |
| | 536 | /* PNG_OUT_OF_RANGE returns true if value is outside the range |
| | 537 | * ideal-delta..ideal+delta. Each argument is evaluated twice. |
| | 538 | * "ideal" and "delta" should be constants, normally simple |
| | 539 | * integers, "value" a variable. Added to libpng-1.2.6 JB |
| | 540 | */ |
| | 541 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
| | 542 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
| | 543 | |
| | 544 | /* Conversions between fixed and floating point, only defined if |
| | 545 | * required (to make sure the code doesn't accidentally use float |
| | 546 | * when it is supposedly disabled.) |
| | 547 | */ |
| | 548 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| | 549 | /* The floating point conversion can't overflow, though it can and |
| | 550 | * does lose accuracy relative to the original fixed point value. |
| | 551 | * In practice this doesn't matter because png_fixed_point only |
| | 552 | * stores numbers with very low precision. The png_ptr and s |
| | 553 | * arguments are unused by default but are there in case error |
| | 554 | * checking becomes a requirement. |
| | 555 | */ |
| | 556 | #define png_float(png_ptr, fixed, s) (.00001 * (fixed)) |
| | 557 | |
| | 558 | /* The fixed point conversion performs range checking and evaluates |
| | 559 | * its argument multiple times, so must be used with care. The |
| | 560 | * range checking uses the PNG specification values for a signed |
| | 561 | * 32 bit fixed point value except that the values are deliberately |
| | 562 | * rounded-to-zero to an integral value - 21474 (21474.83 is roughly |
| | 563 | * (2^31-1) * 100000). 's' is a string that describes the value being |
| | 564 | * converted. |
| | 565 | * |
| | 566 | * NOTE: this macro will raise a png_error if the range check fails, |
| | 567 | * therefore it is normally only appropriate to use this on values |
| | 568 | * that come from API calls or other sources where an out of range |
| | 569 | * error indicates a programming error, not a data error! |
| | 570 | * |
| | 571 | * NOTE: by default this is off - the macro is not used - because the |
| | 572 | * function call saves a lot of code. |
| | 573 | */ |
| | 574 | #ifdef PNG_FIXED_POINT_MACRO_SUPPORTED |
| | 575 | #define png_fixed(png_ptr, fp, s) ((fp) <= 21474 && (fp) >= -21474 ?\ |
| | 576 | ((png_fixed_point)(100000 * (fp))) : (png_fixed_error(png_ptr, s),0)) |
| | 577 | #else |
| | 578 | PNG_EXTERN png_fixed_point png_fixed PNGARG((png_structp png_ptr, double fp, |
| | 579 | png_const_charp text)); |
| | 580 | #endif |
| | 581 | #endif |
| | 582 | |
| | 583 | /* Constants for known chunk types. If you need to add a chunk, define the name |
| | 584 | * here. For historical reasons these constants have the form png_<name>; i.e. |
| | 585 | * the prefix is lower case. Please use decimal values as the parameters to |
| | 586 | * match the ISO PNG specification and to avoid relying on the C locale |
| | 587 | * interpretation of character values. |
| | 588 | * |
| | 589 | * Prior to 1.5.6 these constants were strings, as of 1.5.6 png_uint_32 values |
| | 590 | * are computed and a new macro (PNG_STRING_FROM_CHUNK) added to allow a string |
| | 591 | * to be generated if required. |
| | 592 | * |
| | 593 | * PNG_32b correctly produces a value shifted by up to 24 bits, even on |
| | 594 | * architectures where (int) is only 16 bits. |
| | 595 | */ |
| | 596 | #define PNG_32b(b,s) ((png_uint_32)(b) << (s)) |
| | 597 | #define PNG_CHUNK(b1,b2,b3,b4) \ |
| | 598 | (PNG_32b(b1,24) | PNG_32b(b2,16) | PNG_32b(b3,8) | PNG_32b(b4,0)) |
| | 599 | |
| | 600 | #define png_IHDR PNG_CHUNK( 73, 72, 68, 82) |
| | 601 | #define png_IDAT PNG_CHUNK( 73, 68, 65, 84) |
| | 602 | #define png_IEND PNG_CHUNK( 73, 69, 78, 68) |
| | 603 | #define png_PLTE PNG_CHUNK( 80, 76, 84, 69) |
| | 604 | #define png_bKGD PNG_CHUNK( 98, 75, 71, 68) |
| | 605 | #define png_cHRM PNG_CHUNK( 99, 72, 82, 77) |
| | 606 | #define png_gAMA PNG_CHUNK(103, 65, 77, 65) |
| | 607 | #define png_hIST PNG_CHUNK(104, 73, 83, 84) |
| | 608 | #define png_iCCP PNG_CHUNK(105, 67, 67, 80) |
| | 609 | #define png_iTXt PNG_CHUNK(105, 84, 88, 116) |
| | 610 | #define png_oFFs PNG_CHUNK(111, 70, 70, 115) |
| | 611 | #define png_pCAL PNG_CHUNK(112, 67, 65, 76) |
| | 612 | #define png_sCAL PNG_CHUNK(115, 67, 65, 76) |
| | 613 | #define png_pHYs PNG_CHUNK(112, 72, 89, 115) |
| | 614 | #define png_sBIT PNG_CHUNK(115, 66, 73, 84) |
| | 615 | #define png_sPLT PNG_CHUNK(115, 80, 76, 84) |
| | 616 | #define png_sRGB PNG_CHUNK(115, 82, 71, 66) |
| | 617 | #define png_sTER PNG_CHUNK(115, 84, 69, 82) |
| | 618 | #define png_tEXt PNG_CHUNK(116, 69, 88, 116) |
| | 619 | #define png_tIME PNG_CHUNK(116, 73, 77, 69) |
| | 620 | #define png_tRNS PNG_CHUNK(116, 82, 78, 83) |
| | 621 | #define png_zTXt PNG_CHUNK(122, 84, 88, 116) |
| | 622 | |
| | 623 | /* The following will work on (signed char*) strings, whereas the get_uint_32 |
| | 624 | * macro will fail on top-bit-set values because of the sign extension. |
| | 625 | */ |
| | 626 | #define PNG_CHUNK_FROM_STRING(s)\ |
| | 627 | PNG_CHUNK(0xff&(s)[0], 0xff&(s)[1], 0xff&(s)[2], 0xff&(s)[3]) |
| | 628 | |
| | 629 | /* This uses (char), not (png_byte) to avoid warnings on systems where (char) is |
| | 630 | * signed and the argument is a (char[]) This macro will fail miserably on |
| | 631 | * systems where (char) is more than 8 bits. |
| | 632 | */ |
| | 633 | #define PNG_STRING_FROM_CHUNK(s,c)\ |
| | 634 | (void)(((char*)(s))[0]=(char)((c)>>24), ((char*)(s))[1]=(char)((c)>>16),\ |
| | 635 | ((char*)(s))[2]=(char)((c)>>8), ((char*)(s))[3]=(char)((c))) |
| | 636 | |
| | 637 | /* Do the same but terminate with a null character. */ |
| | 638 | #define PNG_CSTRING_FROM_CHUNK(s,c)\ |
| | 639 | (void)(PNG_STRING_FROM_CHUNK(s,c), ((char*)(s))[4] = 0) |
| | 640 | |
| | 641 | /* Test on flag values as defined in the spec (section 5.4): */ |
| | 642 | #define PNG_CHUNK_ANCILLIARY(c) (1 & ((c) >> 29)) |
| | 643 | #define PNG_CHUNK_CRITICAL(c) (!PNG_CHUNK_ANCILLIARY(c)) |
| | 644 | #define PNG_CHUNK_PRIVATE(c) (1 & ((c) >> 21)) |
| | 645 | #define PNG_CHUNK_RESERVED(c) (1 & ((c) >> 13)) |
| | 646 | #define PNG_CHUNK_SAFE_TO_COPY(c) (1 & ((c) >> 5)) |
| | 647 | |
| | 648 | /* Gamma values (new at libpng-1.5.4): */ |
| | 649 | #define PNG_GAMMA_MAC_OLD 151724 /* Assume '1.8' is really 2.2/1.45! */ |
| | 650 | #define PNG_GAMMA_MAC_INVERSE 65909 |
| | 651 | #define PNG_GAMMA_sRGB_INVERSE 45455 |
| | 652 | |
| | 653 | |
| | 654 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| | 655 | #ifdef __cplusplus |
| | 656 | extern "C" { |
| | 657 | #endif /* __cplusplus */ |
| | 658 | |
| | 659 | /* These functions are used internally in the code. They generally |
| | 660 | * shouldn't be used unless you are writing code to add or replace some |
| | 661 | * functionality in libpng. More information about most functions can |
| | 662 | * be found in the files where the functions are located. |
| | 663 | */ |
| | 664 | |
| | 665 | /* Check the user version string for compatibility, returns false if the version |
| | 666 | * numbers aren't compatible. |
| | 667 | */ |
| | 668 | PNG_EXTERN int png_user_version_check(png_structp png_ptr, |
| | 669 | png_const_charp user_png_ver); |
| | 670 | |
| | 671 | /* Allocate memory for an internal libpng struct */ |
| | 672 | PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct,PNGARG((int type)), |
| | 673 | PNG_ALLOCATED); |
| | 674 | |
| | 675 | /* Free memory from internal libpng struct */ |
| | 676 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
| | 677 | |
| | 678 | PNG_EXTERN PNG_FUNCTION(png_voidp,png_create_struct_2, |
| | 679 | PNGARG((int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)), |
| | 680 | PNG_ALLOCATED); |
| | 681 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
| | 682 | png_free_ptr free_fn, png_voidp mem_ptr)); |
| | 683 | |
| | 684 | /* Free any memory that info_ptr points to and reset struct. */ |
| | 685 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
| | 686 | png_infop info_ptr)); |
| | 687 | |
| | 688 | /* Function to allocate memory for zlib. PNGAPI is disallowed. */ |
| | 689 | PNG_EXTERN PNG_FUNCTION(voidpf,png_zalloc,PNGARG((voidpf png_ptr, uInt items, |
| | 690 | uInt size)),PNG_ALLOCATED); |
| | 691 | |
| | 692 | /* Function to free memory for zlib. PNGAPI is disallowed. */ |
| | 693 | PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
| | 694 | |
| | 695 | /* Next four functions are used internally as callbacks. PNGCBAPI is required |
| | 696 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3, changed to |
| | 697 | * PNGCBAPI at 1.5.0 |
| | 698 | */ |
| | 699 | |
| | 700 | PNG_EXTERN void PNGCBAPI png_default_read_data PNGARG((png_structp png_ptr, |
| | 701 | png_bytep data, png_size_t length)); |
| | 702 | |
| | 703 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| | 704 | PNG_EXTERN void PNGCBAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
| | 705 | png_bytep buffer, png_size_t length)); |
| | 706 | #endif |
| | 707 | |
| | 708 | PNG_EXTERN void PNGCBAPI png_default_write_data PNGARG((png_structp png_ptr, |
| | 709 | png_bytep data, png_size_t length)); |
| | 710 | |
| | 711 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| | 712 | # ifdef PNG_STDIO_SUPPORTED |
| | 713 | PNG_EXTERN void PNGCBAPI png_default_flush PNGARG((png_structp png_ptr)); |
| | 714 | # endif |
| | 715 | #endif |
| | 716 | |
| | 717 | /* Reset the CRC variable */ |
| | 718 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| | 719 | |
| | 720 | /* Write the "data" buffer to whatever output you are using */ |
| | 721 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, |
| | 722 | png_const_bytep data, png_size_t length)); |
| | 723 | |
| | 724 | /* Read and check the PNG file signature */ |
| | 725 | PNG_EXTERN void png_read_sig PNGARG((png_structp png_ptr, png_infop info_ptr)); |
| | 726 | |
| | 727 | /* Read the chunk header (length + type name) */ |
| | 728 | PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); |
| | 729 | |
| | 730 | /* Read data from whatever input you are using into the "data" buffer */ |
| | 731 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| | 732 | png_size_t length)); |
| | 733 | |
| | 734 | /* Read bytes into buf, and update png_ptr->crc */ |
| | 735 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| | 736 | png_size_t length)); |
| | 737 | |
| | 738 | /* Decompress data in a chunk that uses compression */ |
| | 739 | #if defined(PNG_READ_COMPRESSED_TEXT_SUPPORTED) |
| | 740 | PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, |
| | 741 | int comp_type, png_size_t chunklength, png_size_t prefix_length, |
| | 742 | png_size_t *data_length)); |
| | 743 | #endif |
| | 744 | |
| | 745 | /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
| | 746 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
| | 747 | |
| | 748 | /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
| | 749 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
| | 750 | |
| | 751 | /* Calculate the CRC over a section of data. Note that we are only |
| | 752 | * passing a maximum of 64K on systems that have this as a memory limit, |
| | 753 | * since this is the maximum buffer size we can specify. |
| | 754 | */ |
| | 755 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, |
| | 756 | png_const_bytep ptr, png_size_t length)); |
| | 757 | |
| | 758 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| | 759 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
| | 760 | #endif |
| | 761 | |
| | 762 | /* Write various chunks */ |
| | 763 | |
| | 764 | /* Write the IHDR chunk, and update the png_struct with the necessary |
| | 765 | * information. |
| | 766 | */ |
| | 767 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
| | 768 | png_uint_32 height, |
| | 769 | int bit_depth, int color_type, int compression_method, int filter_method, |
| | 770 | int interlace_method)); |
| | 771 | |
| | 772 | PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, |
| | 773 | png_const_colorp palette, png_uint_32 num_pal)); |
| | 774 | |
| | 775 | PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| | 776 | png_size_t length)); |
| | 777 | |
| | 778 | PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
| | 779 | |
| | 780 | #ifdef PNG_WRITE_gAMA_SUPPORTED |
| | 781 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| | 782 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
| | 783 | # endif |
| | 784 | # ifdef PNG_FIXED_POINT_SUPPORTED |
| | 785 | PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, |
| | 786 | png_fixed_point file_gamma)); |
| | 787 | # endif |
| | 788 | #endif |
| | 789 | |
| | 790 | #ifdef PNG_WRITE_sBIT_SUPPORTED |
| | 791 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, |
| | 792 | png_const_color_8p sbit, int color_type)); |
| | 793 | #endif |
| | 794 | |
| | 795 | #ifdef PNG_WRITE_cHRM_SUPPORTED |
| | 796 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| | 797 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
| | 798 | double white_x, double white_y, |
| | 799 | double red_x, double red_y, double green_x, double green_y, |
| | 800 | double blue_x, double blue_y)); |
| | 801 | # endif |
| | 802 | PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
| | 803 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
| | 804 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| | 805 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| | 806 | png_fixed_point int_blue_y)); |
| | 807 | #endif |
| | 808 | |
| | 809 | #ifdef PNG_WRITE_sRGB_SUPPORTED |
| | 810 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
| | 811 | int intent)); |
| | 812 | #endif |
| | 813 | |
| | 814 | #ifdef PNG_WRITE_iCCP_SUPPORTED |
| | 815 | PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
| | 816 | png_const_charp name, int compression_type, |
| | 817 | png_const_charp profile, int proflen)); |
| | 818 | /* Note to maintainer: profile should be png_bytep */ |
| | 819 | #endif |
| | 820 | |
| | 821 | #ifdef PNG_WRITE_sPLT_SUPPORTED |
| | 822 | PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
| | 823 | png_const_sPLT_tp palette)); |
| | 824 | #endif |
| | 825 | |
| | 826 | #ifdef PNG_WRITE_tRNS_SUPPORTED |
| | 827 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, |
| | 828 | png_const_bytep trans, png_const_color_16p values, int number, |
| | 829 | int color_type)); |
| | 830 | #endif |
| | 831 | |
| | 832 | #ifdef PNG_WRITE_bKGD_SUPPORTED |
| | 833 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| | 834 | png_const_color_16p values, int color_type)); |
| | 835 | #endif |
| | 836 | |
| | 837 | #ifdef PNG_WRITE_hIST_SUPPORTED |
| | 838 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, |
| | 839 | png_const_uint_16p hist, int num_hist)); |
| | 840 | #endif |
| | 841 | |
| | 842 | /* Chunks that have keywords */ |
| | 843 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| | 844 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| | 845 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
| | 846 | png_const_charp key, png_charpp new_key)); |
| | 847 | #endif |
| | 848 | |
| | 849 | #ifdef PNG_WRITE_tEXt_SUPPORTED |
| | 850 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_const_charp key, |
| | 851 | png_const_charp text, png_size_t text_len)); |
| | 852 | #endif |
| | 853 | |
| | 854 | #ifdef PNG_WRITE_zTXt_SUPPORTED |
| | 855 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_const_charp key, |
| | 856 | png_const_charp text, png_size_t text_len, int compression)); |
| | 857 | #endif |
| | 858 | |
| | 859 | #ifdef PNG_WRITE_iTXt_SUPPORTED |
| | 860 | PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
| | 861 | int compression, png_const_charp key, png_const_charp lang, |
| | 862 | png_const_charp lang_key, png_const_charp text)); |
| | 863 | #endif |
| | 864 | |
| | 865 | #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ |
| | 866 | PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
| | 867 | png_infop info_ptr, png_const_textp text_ptr, int num_text)); |
| | 868 | #endif |
| | 869 | |
| | 870 | #ifdef PNG_WRITE_oFFs_SUPPORTED |
| | 871 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
| | 872 | png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
| | 873 | #endif |
| | 874 | |
| | 875 | #ifdef PNG_WRITE_pCAL_SUPPORTED |
| | 876 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| | 877 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
| | 878 | png_const_charp units, png_charpp params)); |
| | 879 | #endif |
| | 880 | |
| | 881 | #ifdef PNG_WRITE_pHYs_SUPPORTED |
| | 882 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| | 883 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
| | 884 | int unit_type)); |
| | 885 | #endif |
| | 886 | |
| | 887 | #ifdef PNG_WRITE_tIME_SUPPORTED |
| | 888 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
| | 889 | png_const_timep mod_time)); |
| | 890 | #endif |
| | 891 | |
| | 892 | #ifdef PNG_WRITE_sCAL_SUPPORTED |
| | 893 | PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
| | 894 | int unit, png_const_charp width, png_const_charp height)); |
| | 895 | #endif |
| | 896 | |
| | 897 | /* Called when finished processing a row of data */ |
| | 898 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
| | 899 | |
| | 900 | /* Internal use only. Called before first row of data */ |
| | 901 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
| | 902 | |
| | 903 | /* Combine a row of data, dealing with alpha, etc. if requested. 'row' is an |
| | 904 | * array of png_ptr->width pixels. If the image is not interlaced or this |
| | 905 | * is the final pass this just does a png_memcpy, otherwise the "display" flag |
| | 906 | * is used to determine whether to copy pixels that are not in the current pass. |
| | 907 | * |
| | 908 | * Because 'png_do_read_interlace' (below) replicates pixels this allows this |
| | 909 | * function to achieve the documented 'blocky' appearance during interlaced read |
| | 910 | * if display is 1 and the 'sparkle' appearance, where existing pixels in 'row' |
| | 911 | * are not changed if they are not in the current pass, when display is 0. |
| | 912 | * |
| | 913 | * 'display' must be 0 or 1, otherwise the memcpy will be done regardless. |
| | 914 | * |
| | 915 | * The API always reads from the png_struct row buffer and always assumes that |
| | 916 | * it is full width (png_do_read_interlace has already been called.) |
| | 917 | * |
| | 918 | * This function is only ever used to write to row buffers provided by the |
| | 919 | * caller of the relevant libpng API and the row must have already been |
| | 920 | * transformed by the read transformations. |
| | 921 | * |
| | 922 | * The PNG_USE_COMPILE_TIME_MASKS option causes generation of pre-computed |
| | 923 | * bitmasks for use within the code, otherwise runtime generated masks are used. |
| | 924 | * The default is compile time masks. |
| | 925 | */ |
| | 926 | #ifndef PNG_USE_COMPILE_TIME_MASKS |
| | 927 | # define PNG_USE_COMPILE_TIME_MASKS 1 |
| | 928 | #endif |
| | 929 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
| | 930 | int display)); |
| | 931 | |
| | 932 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
| | 933 | /* Expand an interlaced row: the 'row_info' describes the pass data that has |
| | 934 | * been read in and must correspond to the pixels in 'row', the pixels are |
| | 935 | * expanded (moved apart) in 'row' to match the final layout, when doing this |
| | 936 | * the pixels are *replicated* to the intervening space. This is essential for |
| | 937 | * the correct operation of png_combine_row, above. |
| | 938 | */ |
| | 939 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| | 940 | png_bytep row, int pass, png_uint_32 transformations)); |
| | 941 | #endif |
| | 942 | |
| | 943 | /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
| | 944 | |
| | 945 | #ifdef PNG_WRITE_INTERLACING_SUPPORTED |
| | 946 | /* Grab pixels out of a row for an interlaced pass */ |
| | 947 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
| | 948 | png_bytep row, int pass)); |
| | 949 | #endif |
| | 950 | |
| | 951 | /* Unfilter a row: check the filter value before calling this, there is no point |
| | 952 | * calling it for PNG_FILTER_VALUE_NONE. |
| | 953 | */ |
| | 954 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop row_info, |
| | 955 | png_bytep row, png_const_bytep prev_row, int filter)); |
| | 956 | |
| | 957 | PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info, |
| | 958 | png_bytep row, png_const_bytep prev_row)); |
| | 959 | PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info, |
| | 960 | png_bytep row, png_const_bytep prev_row)); |
| | 961 | PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info, |
| | 962 | png_bytep row, png_const_bytep prev_row)); |
| | 963 | PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info, |
| | 964 | png_bytep row, png_const_bytep prev_row)); |
| | 965 | PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info, |
| | 966 | png_bytep row, png_const_bytep prev_row)); |
| | 967 | PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info, |
| | 968 | png_bytep row, png_const_bytep prev_row)); |
| | 969 | PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info, |
| | 970 | png_bytep row, png_const_bytep prev_row)); |
| | 971 | |
| | 972 | /* Choose the best filter to use and filter the row data */ |
| | 973 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
| | 974 | png_row_infop row_info)); |
| | 975 | |
| | 976 | /* Finish a row while reading, dealing with interlacing passes, etc. */ |
| | 977 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| | 978 | |
| | 979 | /* Initialize the row buffers, etc. */ |
| | 980 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
| | 981 | |
| | 982 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
| | 983 | /* Optional call to update the users info structure */ |
| | 984 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
| | 985 | png_infop info_ptr)); |
| | 986 | #endif |
| | 987 | |
| | 988 | /* These are the functions that do the transformations */ |
| | 989 | #ifdef PNG_READ_FILLER_SUPPORTED |
| | 990 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| | 991 | png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
| | 992 | #endif |
| | 993 | |
| | 994 | #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED |
| | 995 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| | 996 | png_bytep row)); |
| | 997 | #endif |
| | 998 | |
| | 999 | #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED |
| | 1000 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| | 1001 | png_bytep row)); |
| | 1002 | #endif |
| | 1003 | |
| | 1004 | #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED |
| | 1005 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
| | 1006 | png_bytep row)); |
| | 1007 | #endif |
| | 1008 | |
| | 1009 | #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED |
| | 1010 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
| | 1011 | png_bytep row)); |
| | 1012 | #endif |
| | 1013 | |
| | 1014 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| | 1015 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| | 1016 | PNG_EXTERN void png_do_strip_channel PNGARG((png_row_infop row_info, |
| | 1017 | png_bytep row, int at_start)); |
| | 1018 | #endif |
| | 1019 | |
| | 1020 | #ifdef PNG_16BIT_SUPPORTED |
| | 1021 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| | 1022 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, |
| | 1023 | png_bytep row)); |
| | 1024 | #endif |
| | 1025 | #endif |
| | 1026 | |
| | 1027 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| | 1028 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| | 1029 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, |
| | 1030 | png_bytep row)); |
| | 1031 | #endif |
| | 1032 | |
| | 1033 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| | 1034 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, |
| | 1035 | png_row_infop row_info, png_bytep row)); |
| | 1036 | #endif |
| | 1037 | |
| | 1038 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
| | 1039 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| | 1040 | png_bytep row)); |
| | 1041 | #endif |
| | 1042 | |
| | 1043 | #ifdef PNG_READ_PACK_SUPPORTED |
| | 1044 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, |
| | 1045 | png_bytep row)); |
| | 1046 | #endif |
| | 1047 | |
| | 1048 | #ifdef PNG_READ_SHIFT_SUPPORTED |
| | 1049 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, |
| | 1050 | png_bytep row, png_const_color_8p sig_bits)); |
| | 1051 | #endif |
| | 1052 | |
| | 1053 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| | 1054 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, |
| | 1055 | png_bytep row)); |
| | 1056 | #endif |
| | 1057 | |
| | 1058 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
| | 1059 | PNG_EXTERN void png_do_scale_16_to_8 PNGARG((png_row_infop row_info, |
| | 1060 | png_bytep row)); |
| | 1061 | #endif |
| | 1062 | |
| | 1063 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
| | 1064 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, |
| | 1065 | png_bytep row)); |
| | 1066 | #endif |
| | 1067 | |
| | 1068 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| | 1069 | PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, |
| | 1070 | png_bytep row, png_const_bytep palette_lookup, |
| | 1071 | png_const_bytep quantize_lookup)); |
| | 1072 | |
| | 1073 | # ifdef PNG_CORRECT_PALETTE_SUPPORTED |
| | 1074 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
| | 1075 | png_colorp palette, int num_palette)); |
| | 1076 | # endif |
| | 1077 | #endif |
| | 1078 | |
| | 1079 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| | 1080 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, |
| | 1081 | png_bytep row)); |
| | 1082 | #endif |
| | 1083 | |
| | 1084 | #ifdef PNG_WRITE_PACK_SUPPORTED |
| | 1085 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| | 1086 | png_bytep row, png_uint_32 bit_depth)); |
| | 1087 | #endif |
| | 1088 | |
| | 1089 | #ifdef PNG_WRITE_SHIFT_SUPPORTED |
| | 1090 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, |
| | 1091 | png_bytep row, png_const_color_8p bit_depth)); |
| | 1092 | #endif |
| | 1093 | |
| | 1094 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
| | 1095 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
| | 1096 | PNG_EXTERN void png_do_compose PNGARG((png_row_infop row_info, |
| | 1097 | png_bytep row, png_structp png_ptr)); |
| | 1098 | #endif |
| | 1099 | |
| | 1100 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| | 1101 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, |
| | 1102 | png_bytep row, png_structp png_ptr)); |
| | 1103 | #endif |
| | 1104 | |
| | 1105 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
| | 1106 | PNG_EXTERN void png_do_encode_alpha PNGARG((png_row_infop row_info, |
| | 1107 | png_bytep row, png_structp png_ptr)); |
| | 1108 | #endif |
| | 1109 | |
| | 1110 | #ifdef PNG_READ_EXPAND_SUPPORTED |
| | 1111 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
| | 1112 | png_bytep row, png_const_colorp palette, png_const_bytep trans, |
| | 1113 | int num_trans)); |
| | 1114 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
| | 1115 | png_bytep row, png_const_color_16p trans_color)); |
| | 1116 | #endif |
| | 1117 | |
| | 1118 | #ifdef PNG_READ_EXPAND_16_SUPPORTED |
| | 1119 | PNG_EXTERN void png_do_expand_16 PNGARG((png_row_infop row_info, |
| | 1120 | png_bytep row)); |
| | 1121 | #endif |
| | 1122 | |
| | 1123 | /* The following decodes the appropriate chunks, and does error correction, |
| | 1124 | * then calls the appropriate callback for the chunk if it is valid. |
| | 1125 | */ |
| | 1126 | |
| | 1127 | /* Decode the IHDR chunk */ |
| | 1128 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1129 | png_uint_32 length)); |
| | 1130 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1131 | png_uint_32 length)); |
| | 1132 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1133 | png_uint_32 length)); |
| | 1134 | |
| | 1135 | #ifdef PNG_READ_bKGD_SUPPORTED |
| | 1136 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1137 | png_uint_32 length)); |
| | 1138 | #endif |
| | 1139 | |
| | 1140 | #ifdef PNG_READ_cHRM_SUPPORTED |
| | 1141 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1142 | png_uint_32 length)); |
| | 1143 | #endif |
| | 1144 | |
| | 1145 | #ifdef PNG_READ_gAMA_SUPPORTED |
| | 1146 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1147 | png_uint_32 length)); |
| | 1148 | #endif |
| | 1149 | |
| | 1150 | #ifdef PNG_READ_hIST_SUPPORTED |
| | 1151 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1152 | png_uint_32 length)); |
| | 1153 | #endif |
| | 1154 | |
| | 1155 | #ifdef PNG_READ_iCCP_SUPPORTED |
| | 1156 | PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1157 | png_uint_32 length)); |
| | 1158 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| | 1159 | |
| | 1160 | #ifdef PNG_READ_iTXt_SUPPORTED |
| | 1161 | PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1162 | png_uint_32 length)); |
| | 1163 | #endif |
| | 1164 | |
| | 1165 | #ifdef PNG_READ_oFFs_SUPPORTED |
| | 1166 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1167 | png_uint_32 length)); |
| | 1168 | #endif |
| | 1169 | |
| | 1170 | #ifdef PNG_READ_pCAL_SUPPORTED |
| | 1171 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1172 | png_uint_32 length)); |
| | 1173 | #endif |
| | 1174 | |
| | 1175 | #ifdef PNG_READ_pHYs_SUPPORTED |
| | 1176 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1177 | png_uint_32 length)); |
| | 1178 | #endif |
| | 1179 | |
| | 1180 | #ifdef PNG_READ_sBIT_SUPPORTED |
| | 1181 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1182 | png_uint_32 length)); |
| | 1183 | #endif |
| | 1184 | |
| | 1185 | #ifdef PNG_READ_sCAL_SUPPORTED |
| | 1186 | PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1187 | png_uint_32 length)); |
| | 1188 | #endif |
| | 1189 | |
| | 1190 | #ifdef PNG_READ_sPLT_SUPPORTED |
| | 1191 | PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1192 | png_uint_32 length)); |
| | 1193 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| | 1194 | |
| | 1195 | #ifdef PNG_READ_sRGB_SUPPORTED |
| | 1196 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1197 | png_uint_32 length)); |
| | 1198 | #endif |
| | 1199 | |
| | 1200 | #ifdef PNG_READ_tEXt_SUPPORTED |
| | 1201 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1202 | png_uint_32 length)); |
| | 1203 | #endif |
| | 1204 | |
| | 1205 | #ifdef PNG_READ_tIME_SUPPORTED |
| | 1206 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1207 | png_uint_32 length)); |
| | 1208 | #endif |
| | 1209 | |
| | 1210 | #ifdef PNG_READ_tRNS_SUPPORTED |
| | 1211 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1212 | png_uint_32 length)); |
| | 1213 | #endif |
| | 1214 | |
| | 1215 | #ifdef PNG_READ_zTXt_SUPPORTED |
| | 1216 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| | 1217 | png_uint_32 length)); |
| | 1218 | #endif |
| | 1219 | |
| | 1220 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| | 1221 | PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| | 1222 | png_infop info_ptr, png_uint_32 length)); |
| | 1223 | #endif |
| | 1224 | |
| | 1225 | PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
| | 1226 | png_uint_32 chunk_name)); |
| | 1227 | |
| | 1228 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| | 1229 | /* Exactly as png_handle_as_unknown() except that the argument is a 32-bit chunk |
| | 1230 | * name, not a string. |
| | 1231 | */ |
| | 1232 | PNG_EXTERN int png_chunk_unknown_handling PNGARG((png_structp png_ptr, |
| | 1233 | png_uint_32 chunk_name)); |
| | 1234 | #endif |
| | 1235 | |
| | 1236 | /* Handle the transformations for reading and writing */ |
| | 1237 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
| | 1238 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr, |
| | 1239 | png_row_infop row_info)); |
| | 1240 | #endif |
| | 1241 | #ifdef PNG_WRITE_TRANSFORMS_SUPPORTED |
| | 1242 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr, |
| | 1243 | png_row_infop row_info)); |
| | 1244 | #endif |
| | 1245 | |
| | 1246 | #ifdef PNG_READ_TRANSFORMS_SUPPORTED |
| | 1247 | PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
| | 1248 | #endif |
| | 1249 | |
| | 1250 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| | 1251 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
| | 1252 | png_infop info_ptr)); |
| | 1253 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| | 1254 | png_infop info_ptr)); |
| | 1255 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| | 1256 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
| | 1257 | png_uint_32 length)); |
| | 1258 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| | 1259 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| | 1260 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| | 1261 | png_bytep buffer, png_size_t buffer_length)); |
| | 1262 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| | 1263 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| | 1264 | png_bytep buffer, png_size_t buffer_length)); |
| | 1265 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| | 1266 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| | 1267 | png_infop info_ptr, png_uint_32 length)); |
| | 1268 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| | 1269 | png_infop info_ptr)); |
| | 1270 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| | 1271 | png_infop info_ptr)); |
| | 1272 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| | 1273 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| | 1274 | png_infop info_ptr)); |
| | 1275 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| | 1276 | png_infop info_ptr)); |
| | 1277 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| | 1278 | # ifdef PNG_READ_tEXt_SUPPORTED |
| | 1279 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| | 1280 | png_infop info_ptr, png_uint_32 length)); |
| | 1281 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| | 1282 | png_infop info_ptr)); |
| | 1283 | # endif |
| | 1284 | # ifdef PNG_READ_zTXt_SUPPORTED |
| | 1285 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| | 1286 | png_infop info_ptr, png_uint_32 length)); |
| | 1287 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| | 1288 | png_infop info_ptr)); |
| | 1289 | # endif |
| | 1290 | # ifdef PNG_READ_iTXt_SUPPORTED |
| | 1291 | PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
| | 1292 | png_infop info_ptr, png_uint_32 length)); |
| | 1293 | PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
| | 1294 | png_infop info_ptr)); |
| | 1295 | # endif |
| | 1296 | |
| | 1297 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| | 1298 | |
| | 1299 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| | 1300 | PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
| | 1301 | png_bytep row)); |
| | 1302 | PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
| | 1303 | png_bytep row)); |
| | 1304 | #endif |
| | 1305 | |
| | 1306 | /* Added at libpng version 1.4.0 */ |
| | 1307 | #ifdef PNG_CHECK_cHRM_SUPPORTED |
| | 1308 | PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, |
| | 1309 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
| | 1310 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| | 1311 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| | 1312 | png_fixed_point int_blue_y)); |
| | 1313 | #endif |
| | 1314 | |
| | 1315 | #ifdef PNG_CHECK_cHRM_SUPPORTED |
| | 1316 | /* Added at libpng version 1.2.34 and 1.4.0 */ |
| | 1317 | /* Currently only used by png_check_cHRM_fixed */ |
| | 1318 | PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, |
| | 1319 | unsigned long *hi_product, unsigned long *lo_product)); |
| | 1320 | #endif |
| | 1321 | |
| | 1322 | #ifdef PNG_cHRM_SUPPORTED |
| | 1323 | /* Added at libpng version 1.5.5 */ |
| | 1324 | typedef struct png_xy |
| | 1325 | { |
| | 1326 | png_fixed_point redx, redy; |
| | 1327 | png_fixed_point greenx, greeny; |
| | 1328 | png_fixed_point bluex, bluey; |
| | 1329 | png_fixed_point whitex, whitey; |
| | 1330 | } png_xy; |
| | 1331 | |
| | 1332 | typedef struct png_XYZ |
| | 1333 | { |
| | 1334 | png_fixed_point redX, redY, redZ; |
| | 1335 | png_fixed_point greenX, greenY, greenZ; |
| | 1336 | png_fixed_point blueX, blueY, blueZ; |
| | 1337 | } png_XYZ; |
| | 1338 | |
| | 1339 | /* The conversion APIs return 0 on success, non-zero on a parameter error. They |
| | 1340 | * allow conversion between the above representations of a color encoding. When |
| | 1341 | * converting from XYZ end points to chromaticities the absolute magnitude of |
| | 1342 | * the end points is lost, when converting back the sum of the Y values of the |
| | 1343 | * three end points will be 1.0 |
| | 1344 | */ |
| | 1345 | PNG_EXTERN int png_xy_from_XYZ PNGARG((png_xy *xy, png_XYZ XYZ)); |
| | 1346 | PNG_EXTERN int png_XYZ_from_xy PNGARG((png_XYZ *XYZ, png_xy xy)); |
| | 1347 | PNG_EXTERN int png_XYZ_from_xy_checked PNGARG((png_structp png_ptr, |
| | 1348 | png_XYZ *XYZ, png_xy xy)); |
| | 1349 | #endif |
| | 1350 | |
| | 1351 | /* Added at libpng version 1.4.0 */ |
| | 1352 | PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, |
| | 1353 | png_uint_32 width, png_uint_32 height, int bit_depth, |
| | 1354 | int color_type, int interlace_type, int compression_type, |
| | 1355 | int filter_type)); |
| | 1356 | |
| | 1357 | /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ |
| | 1358 | PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, |
| | 1359 | png_infop info_ptr, png_infop end_info_ptr)); |
| | 1360 | |
| | 1361 | /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
| | 1362 | PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); |
| | 1363 | |
| | 1364 | #ifdef USE_FAR_KEYWORD /* memory model conversion function */ |
| | 1365 | PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr, png_voidp ptr, |
| | 1366 | int check)); |
| | 1367 | #endif /* USE_FAR_KEYWORD */ |
| | 1368 | |
| | 1369 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_ERROR_TEXT_SUPPORTED) |
| | 1370 | PNG_EXTERN PNG_FUNCTION(void, png_fixed_error, (png_structp png_ptr, |
| | 1371 | png_const_charp name),PNG_NORETURN); |
| | 1372 | #endif |
| | 1373 | |
| | 1374 | /* Puts 'string' into 'buffer' at buffer[pos], taking care never to overwrite |
| | 1375 | * the end. Always leaves the buffer nul terminated. Never errors out (and |
| | 1376 | * there is no error code.) |
| | 1377 | */ |
| | 1378 | PNG_EXTERN size_t png_safecat(png_charp buffer, size_t bufsize, size_t pos, |
| | 1379 | png_const_charp string); |
| | 1380 | |
| | 1381 | /* Various internal functions to handle formatted warning messages, currently |
| | 1382 | * only implemented for warnings. |
| | 1383 | */ |
| | 1384 | #if defined(PNG_WARNINGS_SUPPORTED) || defined(PNG_TIME_RFC1123_SUPPORTED) |
| | 1385 | /* Utility to dump an unsigned value into a buffer, given a start pointer and |
| | 1386 | * and end pointer (which should point just *beyond* the end of the buffer!) |
| | 1387 | * Returns the pointer to the start of the formatted string. This utility only |
| | 1388 | * does unsigned values. |
| | 1389 | */ |
| | 1390 | PNG_EXTERN png_charp png_format_number(png_const_charp start, png_charp end, |
| | 1391 | int format, png_alloc_size_t number); |
| | 1392 | |
| | 1393 | /* Convenience macro that takes an array: */ |
| | 1394 | #define PNG_FORMAT_NUMBER(buffer,format,number) \ |
| | 1395 | png_format_number(buffer, buffer + (sizeof buffer), format, number) |
| | 1396 | |
| | 1397 | /* Suggested size for a number buffer (enough for 64 bits and a sign!) */ |
| | 1398 | #define PNG_NUMBER_BUFFER_SIZE 24 |
| | 1399 | |
| | 1400 | /* These are the integer formats currently supported, the name is formed from |
| | 1401 | * the standard printf(3) format string. |
| | 1402 | */ |
| | 1403 | #define PNG_NUMBER_FORMAT_u 1 /* chose unsigned API! */ |
| | 1404 | #define PNG_NUMBER_FORMAT_02u 2 |
| | 1405 | #define PNG_NUMBER_FORMAT_d 1 /* chose signed API! */ |
| | 1406 | #define PNG_NUMBER_FORMAT_02d 2 |
| | 1407 | #define PNG_NUMBER_FORMAT_x 3 |
| | 1408 | #define PNG_NUMBER_FORMAT_02x 4 |
| | 1409 | #define PNG_NUMBER_FORMAT_fixed 5 /* choose the signed API */ |
| | 1410 | #endif |
| | 1411 | |
| | 1412 | #ifdef PNG_WARNINGS_SUPPORTED |
| | 1413 | /* New defines and members adding in libpng-1.5.4 */ |
| | 1414 | # define PNG_WARNING_PARAMETER_SIZE 32 |
| | 1415 | # define PNG_WARNING_PARAMETER_COUNT 8 |
| | 1416 | |
| | 1417 | /* An l-value of this type has to be passed to the APIs below to cache the |
| | 1418 | * values of the parameters to a formatted warning message. |
| | 1419 | */ |
| | 1420 | typedef char png_warning_parameters[PNG_WARNING_PARAMETER_COUNT][ |
| | 1421 | PNG_WARNING_PARAMETER_SIZE]; |
| | 1422 | |
| | 1423 | PNG_EXTERN void png_warning_parameter(png_warning_parameters p, int number, |
| | 1424 | png_const_charp string); |
| | 1425 | /* Parameters are limited in size to PNG_WARNING_PARAMETER_SIZE characters, |
| | 1426 | * including the trailing '\0'. |
| | 1427 | */ |
| | 1428 | PNG_EXTERN void png_warning_parameter_unsigned(png_warning_parameters p, |
| | 1429 | int number, int format, png_alloc_size_t value); |
| | 1430 | /* Use png_alloc_size_t because it is an unsigned type as big as any we |
| | 1431 | * need to output. Use the following for a signed value. |
| | 1432 | */ |
| | 1433 | PNG_EXTERN void png_warning_parameter_signed(png_warning_parameters p, |
| | 1434 | int number, int format, png_int_32 value); |
| | 1435 | |
| | 1436 | PNG_EXTERN void png_formatted_warning(png_structp png_ptr, |
| | 1437 | png_warning_parameters p, png_const_charp message); |
| | 1438 | /* 'message' follows the X/Open approach of using @1, @2 to insert |
| | 1439 | * parameters previously supplied using the above functions. Errors in |
| | 1440 | * specifying the paramters will simple result in garbage substitutions. |
| | 1441 | */ |
| | 1442 | #endif |
| | 1443 | |
| | 1444 | /* ASCII to FP interfaces, currently only implemented if sCAL |
| | 1445 | * support is required. |
| | 1446 | */ |
| | 1447 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| | 1448 | /* MAX_DIGITS is actually the maximum number of characters in an sCAL |
| | 1449 | * width or height, derived from the precision (number of significant |
| | 1450 | * digits - a build time settable option) and assumpitions about the |
| | 1451 | * maximum ridiculous exponent. |
| | 1452 | */ |
| | 1453 | #define PNG_sCAL_MAX_DIGITS (PNG_sCAL_PRECISION+1/*.*/+1/*E*/+10/*exponent*/) |
| | 1454 | |
| | 1455 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| | 1456 | PNG_EXTERN void png_ascii_from_fp PNGARG((png_structp png_ptr, png_charp ascii, |
| | 1457 | png_size_t size, double fp, unsigned int precision)); |
| | 1458 | #endif /* FLOATING_POINT */ |
| | 1459 | |
| | 1460 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| | 1461 | PNG_EXTERN void png_ascii_from_fixed PNGARG((png_structp png_ptr, |
| | 1462 | png_charp ascii, png_size_t size, png_fixed_point fp)); |
| | 1463 | #endif /* FIXED_POINT */ |
| | 1464 | #endif /* READ_sCAL */ |
| | 1465 | |
| | 1466 | #if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED) |
| | 1467 | /* An internal API to validate the format of a floating point number. |
| | 1468 | * The result is the index of the next character. If the number is |
| | 1469 | * not valid it will be the index of a character in the supposed number. |
| | 1470 | * |
| | 1471 | * The format of a number is defined in the PNG extensions specification |
| | 1472 | * and this API is strictly conformant to that spec, not anyone elses! |
| | 1473 | * |
| | 1474 | * The format as a regular expression is: |
| | 1475 | * |
| | 1476 | * [+-]?[0-9]+.?([Ee][+-]?[0-9]+)? |
| | 1477 | * |
| | 1478 | * or: |
| | 1479 | * |
| | 1480 | * [+-]?.[0-9]+(.[0-9]+)?([Ee][+-]?[0-9]+)? |
| | 1481 | * |
| | 1482 | * The complexity is that either integer or fraction must be present and the |
| | 1483 | * fraction is permitted to have no digits only if the integer is present. |
| | 1484 | * |
| | 1485 | * NOTE: The dangling E problem. |
| | 1486 | * There is a PNG valid floating point number in the following: |
| | 1487 | * |
| | 1488 | * PNG floating point numb1.ers are not greedy. |
| | 1489 | * |
| | 1490 | * Working this out requires *TWO* character lookahead (because of the |
| | 1491 | * sign), the parser does not do this - it will fail at the 'r' - this |
| | 1492 | * doesn't matter for PNG sCAL chunk values, but it requires more care |
| | 1493 | * if the value were ever to be embedded in something more complex. Use |
| | 1494 | * ANSI-C strtod if you need the lookahead. |
| | 1495 | */ |
| | 1496 | /* State table for the parser. */ |
| | 1497 | #define PNG_FP_INTEGER 0 /* before or in integer */ |
| | 1498 | #define PNG_FP_FRACTION 1 /* before or in fraction */ |
| | 1499 | #define PNG_FP_EXPONENT 2 /* before or in exponent */ |
| | 1500 | #define PNG_FP_STATE 3 /* mask for the above */ |
| | 1501 | #define PNG_FP_SAW_SIGN 4 /* Saw +/- in current state */ |
| | 1502 | #define PNG_FP_SAW_DIGIT 8 /* Saw a digit in current state */ |
| | 1503 | #define PNG_FP_SAW_DOT 16 /* Saw a dot in current state */ |
| | 1504 | #define PNG_FP_SAW_E 32 /* Saw an E (or e) in current state */ |
| | 1505 | #define PNG_FP_SAW_ANY 60 /* Saw any of the above 4 */ |
| | 1506 | |
| | 1507 | /* These three values don't affect the parser. They are set but not used. |
| | 1508 | */ |
| | 1509 | #define PNG_FP_WAS_VALID 64 /* Preceding substring is a valid fp number */ |
| | 1510 | #define PNG_FP_NEGATIVE 128 /* A negative number, including "-0" */ |
| | 1511 | #define PNG_FP_NONZERO 256 /* A non-zero value */ |
| | 1512 | #define PNG_FP_STICKY 448 /* The above three flags */ |
| | 1513 | |
| | 1514 | /* This is available for the caller to store in 'state' if required. Do not |
| | 1515 | * call the parser after setting it (the parser sometimes clears it.) |
| | 1516 | */ |
| | 1517 | #define PNG_FP_INVALID 512 /* Available for callers as a distinct value */ |
| | 1518 | |
| | 1519 | /* Result codes for the parser (boolean - true meants ok, false means |
| | 1520 | * not ok yet.) |
| | 1521 | */ |
| | 1522 | #define PNG_FP_MAYBE 0 /* The number may be valid in the future */ |
| | 1523 | #define PNG_FP_OK 1 /* The number is valid */ |
| | 1524 | |
| | 1525 | /* Tests on the sticky non-zero and negative flags. To pass these checks |
| | 1526 | * the state must also indicate that the whole number is valid - this is |
| | 1527 | * achieved by testing PNG_FP_SAW_DIGIT (see the implementation for why this |
| | 1528 | * is equivalent to PNG_FP_OK above.) |
| | 1529 | */ |
| | 1530 | #define PNG_FP_NZ_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NEGATIVE | PNG_FP_NONZERO) |
| | 1531 | /* NZ_MASK: the string is valid and a non-zero negative value */ |
| | 1532 | #define PNG_FP_Z_MASK (PNG_FP_SAW_DIGIT | PNG_FP_NONZERO) |
| | 1533 | /* Z MASK: the string is valid and a non-zero value. */ |
| | 1534 | /* PNG_FP_SAW_DIGIT: the string is valid. */ |
| | 1535 | #define PNG_FP_IS_ZERO(state) (((state) & PNG_FP_Z_MASK) == PNG_FP_SAW_DIGIT) |
| | 1536 | #define PNG_FP_IS_POSITIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_Z_MASK) |
| | 1537 | #define PNG_FP_IS_NEGATIVE(state) (((state) & PNG_FP_NZ_MASK) == PNG_FP_NZ_MASK) |
| | 1538 | |
| | 1539 | /* The actual parser. This can be called repeatedly, it updates |
| | 1540 | * the index into the string and the state variable (which must |
| | 1541 | * be initialzed to 0). It returns a result code, as above. There |
| | 1542 | * is no point calling the parser any more if it fails to advance to |
| | 1543 | * the end of the string - it is stuck on an invalid character (or |
| | 1544 | * terminated by '\0'). |
| | 1545 | * |
| | 1546 | * Note that the pointer will consume an E or even an E+ then leave |
| | 1547 | * a 'maybe' state even though a preceding integer.fraction is valid. |
| | 1548 | * The PNG_FP_WAS_VALID flag indicates that a preceding substring was |
| | 1549 | * a valid number. It's possible to recover from this by calling |
| | 1550 | * the parser again (from the start, with state 0) but with a string |
| | 1551 | * that omits the last character (i.e. set the size to the index of |
| | 1552 | * the problem character.) This has not been tested within libpng. |
| | 1553 | */ |
| | 1554 | PNG_EXTERN int png_check_fp_number PNGARG((png_const_charp string, |
| | 1555 | png_size_t size, int *statep, png_size_tp whereami)); |
| | 1556 | |
| | 1557 | /* This is the same but it checks a complete string and returns true |
| | 1558 | * only if it just contains a floating point number. As of 1.5.4 this |
| | 1559 | * function also returns the state at the end of parsing the number if |
| | 1560 | * it was valid (otherwise it returns 0.) This can be used for testing |
| | 1561 | * for negative or zero values using the sticky flag. |
| | 1562 | */ |
| | 1563 | PNG_EXTERN int png_check_fp_string PNGARG((png_const_charp string, |
| | 1564 | png_size_t size)); |
| | 1565 | #endif /* pCAL || sCAL */ |
| | 1566 | |
| | 1567 | #if defined(PNG_READ_GAMMA_SUPPORTED) ||\ |
| | 1568 | defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG_READ_pHYs_SUPPORTED) |
| | 1569 | /* Added at libpng version 1.5.0 */ |
| | 1570 | /* This is a utility to provide a*times/div (rounded) and indicate |
| | 1571 | * if there is an overflow. The result is a boolean - false (0) |
| | 1572 | * for overflow, true (1) if no overflow, in which case *res |
| | 1573 | * holds the result. |
| | 1574 | */ |
| | 1575 | PNG_EXTERN int png_muldiv PNGARG((png_fixed_point_p res, png_fixed_point a, |
| | 1576 | png_int_32 multiplied_by, png_int_32 divided_by)); |
| | 1577 | #endif |
| | 1578 | |
| | 1579 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
| | 1580 | /* Same deal, but issue a warning on overflow and return 0. */ |
| | 1581 | PNG_EXTERN png_fixed_point png_muldiv_warn PNGARG((png_structp png_ptr, |
| | 1582 | png_fixed_point a, png_int_32 multiplied_by, png_int_32 divided_by)); |
| | 1583 | #endif |
| | 1584 | |
| | 1585 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| | 1586 | /* Calculate a reciprocal - used for gamma values. This returns |
| | 1587 | * 0 if the argument is 0 in order to maintain an undefined value, |
| | 1588 | * there are no warnings. |
| | 1589 | */ |
| | 1590 | PNG_EXTERN png_fixed_point png_reciprocal PNGARG((png_fixed_point a)); |
| | 1591 | |
| | 1592 | /* The same but gives a reciprocal of the product of two fixed point |
| | 1593 | * values. Accuracy is suitable for gamma calculations but this is |
| | 1594 | * not exact - use png_muldiv for that. |
| | 1595 | */ |
| | 1596 | PNG_EXTERN png_fixed_point png_reciprocal2 PNGARG((png_fixed_point a, |
| | 1597 | png_fixed_point b)); |
| | 1598 | #endif |
| | 1599 | |
| | 1600 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| | 1601 | /* Internal fixed point gamma correction. These APIs are called as |
| | 1602 | * required to convert single values - they don't need to be fast, |
| | 1603 | * they are not used when processing image pixel values. |
| | 1604 | * |
| | 1605 | * While the input is an 'unsigned' value it must actually be the |
| | 1606 | * correct bit value - 0..255 or 0..65535 as required. |
| | 1607 | */ |
| | 1608 | PNG_EXTERN png_uint_16 png_gamma_correct PNGARG((png_structp png_ptr, |
| | 1609 | unsigned int value, png_fixed_point gamma_value)); |
| | 1610 | PNG_EXTERN int png_gamma_significant PNGARG((png_fixed_point gamma_value)); |
| | 1611 | PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value, |
| | 1612 | png_fixed_point gamma_value)); |
| | 1613 | PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value, |
| | 1614 | png_fixed_point gamma_value)); |
| | 1615 | PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr); |
| | 1616 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, |
| | 1617 | int bit_depth)); |
| | 1618 | #endif |
| | 1619 | |
| | 1620 | /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
| | 1621 | |
| | 1622 | #include "pngdebug.h" |
| | 1623 | |
| | 1624 | #ifdef __cplusplus |
| | 1625 | } |
| | 1626 | #endif |
| | 1627 | |
| | 1628 | #endif /* PNGPRIV_H */ |
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