1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.8 - December 3, 2004 4 * Copyright (c) 1998-2004 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 * Authors and maintainers: 9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 11 * libpng versions 0.97, January 1998, through 1.2.8 - December 3, 2004: Glenn 12 * See also "Contributing Authors", below. 13 * 14 * Note about libpng version numbers: 15 * 16 * Due to various miscommunications, unforeseen code incompatibilities 17 * and occasional factors outside the authors' control, version numbering 18 * on the library has not always been consistent and straightforward. 19 * The following table summarizes matters since version 0.89c, which was 20 * the first widely used release: 21 * 22 * source png.h png.h shared-lib 23 * version string int version 24 * ------- ------ ----- ---------- 25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 30 * 0.97c 0.97 97 2.0.97 31 * 0.98 0.98 98 2.0.98 32 * 0.99 0.99 98 2.0.99 33 * 0.99a-m 0.99 99 2.0.99 34 * 1.00 1.00 100 2.1.0 [100 should be 10000] 35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 36 * 1.0.1 png.h string is 10001 2.1.0 37 * 1.0.1a-e identical to the 10002 from here on, the shared library 38 * 1.0.2 source version) 10002 is 2.V where V is the source code 39 * 1.0.2a-b 10003 version, except as noted. 40 * 1.0.3 10003 41 * 1.0.3a-d 10004 42 * 1.0.4 10004 43 * 1.0.4a-f 10005 44 * 1.0.5 (+ 2 patches) 10005 45 * 1.0.5a-d 10006 46 * 1.0.5e-r 10100 (not source compatible) 47 * 1.0.5s-v 10006 (not binary compatible) 48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 49 * 1.0.6d-f 10007 (still binary incompatible) 50 * 1.0.6g 10007 51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 52 * 1.0.6i 10007 10.6i 53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 57 * 1.0.7 1 10007 (still compatible) 58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 59 * 1.0.8rc1 1 10008 2.1.0.8rc1 60 * 1.0.8 1 10008 2.1.0.8 61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 62 * 1.0.9rc1 1 10009 2.1.0.9rc1 63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 64 * 1.0.9rc2 1 10009 2.1.0.9rc2 65 * 1.0.9 1 10009 2.1.0.9 66 * 1.0.10beta1 1 10010 2.1.0.10beta1 67 * 1.0.10rc1 1 10010 2.1.0.10rc1 68 * 1.0.10 1 10010 2.1.0.10 69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 70 * 1.0.11rc1 1 10011 2.1.0.11rc1 71 * 1.0.11 1 10011 2.1.0.11 72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 73 * 1.0.12rc1 2 10012 2.1.0.12rc1 74 * 1.0.12 2 10012 2.1.0.12 75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 78 * 1.2.0rc1 3 10200 3.1.2.0rc1 79 * 1.2.0 3 10200 3.1.2.0 80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 82 * 1.2.1 3 10201 3.1.2.1 83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 87 * 1.0.13 10 10013 10.so.0.1.0.13 88 * 1.2.2 12 10202 12.so.0.1.2.2 89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 90 * 1.2.3 12 10203 12.so.0.1.2.3 91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 94 * 1.0.14 10 10014 10.so.0.1.0.14 95 * 1.2.4 13 10204 12.so.0.1.2.4 96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 99 * 1.0.15 10 10015 10.so.0.1.0.15 100 * 1.2.5 13 10205 12.so.0.1.2.5 101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 102 * 1.0.16 10 10016 10.so.0.1.0.16 103 * 1.2.6 13 10206 12.so.0.1.2.6 104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 105 * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 107 * 1.0.17 10 10017 12.so.0.1.0.17 108 * 1.2.7 13 10207 12.so.0.1.2.7 109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 110 * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 112 * 1.0.18 10 10018 12.so.0.1.0.18 113 * 1.2.8 13 10208 12.so.0.1.2.8 114 * 115 * Henceforth the source version will match the shared-library major 116 * and minor numbers; the shared-library major version number will be 117 * used for changes in backward compatibility, as it is intended. The 118 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 119 * for applications, is an unsigned integer of the form xyyzz corresponding 120 * to the source version x.y.z (leading zeros in y and z). Beta versions 121 * were given the previous public release number plus a letter, until 122 * version 1.0.6j; from then on they were given the upcoming public 123 * release number plus "betaNN" or "rcN". 124 * 125 * Binary incompatibility exists only when applications make direct access 126 * to the info_ptr or png_ptr members through png.h, and the compiled 127 * application is loaded with a different version of the library. 128 * 129 * DLLNUM will change each time there are forward or backward changes 130 * in binary compatibility (e.g., when a new feature is added). 131 * 132 * See libpng.txt or libpng.3 for more information. The PNG specification 133 * is available as a W3C Recommendation and as an ISO Specification, 134 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 135 */ 136 137 /* 138 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 139 * 140 * If you modify libpng you may insert additional notices immediately following 141 * this sentence. 142 * 143 * libpng versions 1.2.6, August 15, 2004, through 1.2.8, December 3, 2004, are 144 * Copyright (c) 2004 Glenn Randers-Pehrson, and are 145 * distributed according to the same disclaimer and license as libpng-1.2.5 146 * with the following individual added to the list of Contributing Authors: 147 * 148 * Cosmin Truta 149 * 150 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 151 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 152 * distributed according to the same disclaimer and license as libpng-1.0.6 153 * with the following individuals added to the list of Contributing Authors: 154 * 155 * Simon-Pierre Cadieux 156 * Eric S. Raymond 157 * Gilles Vollant 158 * 159 * and with the following additions to the disclaimer: 160 * 161 * There is no warranty against interference with your enjoyment of the 162 * library or against infringement. There is no warranty that our 163 * efforts or the library will fulfill any of your particular purposes 164 * or needs. This library is provided with all faults, and the entire 165 * risk of satisfactory quality, performance, accuracy, and effort is with 166 * the user. 167 * 168 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 169 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 170 * distributed according to the same disclaimer and license as libpng-0.96, 171 * with the following individuals added to the list of Contributing Authors: 172 * 173 * Tom Lane 174 * Glenn Randers-Pehrson 175 * Willem van Schaik 176 * 177 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 178 * Copyright (c) 1996, 1997 Andreas Dilger 179 * Distributed according to the same disclaimer and license as libpng-0.88, 180 * with the following individuals added to the list of Contributing Authors: 181 * 182 * John Bowler 183 * Kevin Bracey 184 * Sam Bushell 185 * Magnus Holmgren 186 * Greg Roelofs 187 * Tom Tanner 188 * 189 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 190 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 191 * 192 * For the purposes of this copyright and license, "Contributing Authors" 193 * is defined as the following set of individuals: 194 * 195 * Andreas Dilger 196 * Dave Martindale 197 * Guy Eric Schalnat 198 * Paul Schmidt 199 * Tim Wegner 200 * 201 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 202 * and Group 42, Inc. disclaim all warranties, expressed or implied, 203 * including, without limitation, the warranties of merchantability and of 204 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 205 * assume no liability for direct, indirect, incidental, special, exemplary, 206 * or consequential damages, which may result from the use of the PNG 207 * Reference Library, even if advised of the possibility of such damage. 208 * 209 * Permission is hereby granted to use, copy, modify, and distribute this 210 * source code, or portions hereof, for any purpose, without fee, subject 211 * to the following restrictions: 212 * 213 * 1. The origin of this source code must not be misrepresented. 214 * 215 * 2. Altered versions must be plainly marked as such and 216 * must not be misrepresented as being the original source. 217 * 218 * 3. This Copyright notice may not be removed or altered from 219 * any source or altered source distribution. 220 * 221 * The Contributing Authors and Group 42, Inc. specifically permit, without 222 * fee, and encourage the use of this source code as a component to 223 * supporting the PNG file format in commercial products. If you use this 224 * source code in a product, acknowledgment is not required but would be 225 * appreciated. 226 */ 227 228 /* 229 * A "png_get_copyright" function is available, for convenient use in "about" 230 * boxes and the like: 231 * 232 * printf("%s",png_get_copyright(NULL)); 233 * 234 * Also, the PNG logo (in PNG format, of course) is supplied in the 235 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 236 */ 237 238 /* 239 * Libpng is OSI Certified Open Source Software. OSI Certified is a 240 * certification mark of the Open Source Initiative. 241 */ 242 243 /* 244 * The contributing authors would like to thank all those who helped 245 * with testing, bug fixes, and patience. This wouldn't have been 246 * possible without all of you. 247 * 248 * Thanks to Frank J. T. Wojcik for helping with the documentation. 249 */ 250 251 /* 252 * Y2K compliance in libpng: 253 * ========================= 254 * 255 * December 3, 2004 256 * 257 * Since the PNG Development group is an ad-hoc body, we can't make 258 * an official declaration. 259 * 260 * This is your unofficial assurance that libpng from version 0.71 and 261 * upward through 1.2.8 are Y2K compliant. It is my belief that earlier 262 * versions were also Y2K compliant. 263 * 264 * Libpng only has three year fields. One is a 2-byte unsigned integer 265 * that will hold years up to 65535. The other two hold the date in text 266 * format, and will hold years up to 9999. 267 * 268 * The integer is 269 * "png_uint_16 year" in png_time_struct. 270 * 271 * The strings are 272 * "png_charp time_buffer" in png_struct and 273 * "near_time_buffer", which is a local character string in png.c. 274 * 275 * There are seven time-related functions: 276 * png.c: png_convert_to_rfc_1123() in png.c 277 * (formerly png_convert_to_rfc_1152() in error) 278 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 279 * png_convert_from_time_t() in pngwrite.c 280 * png_get_tIME() in pngget.c 281 * png_handle_tIME() in pngrutil.c, called in pngread.c 282 * png_set_tIME() in pngset.c 283 * png_write_tIME() in pngwutil.c, called in pngwrite.c 284 * 285 * All handle dates properly in a Y2K environment. The 286 * png_convert_from_time_t() function calls gmtime() to convert from system 287 * clock time, which returns (year - 1900), which we properly convert to 288 * the full 4-digit year. There is a possibility that applications using 289 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 290 * function, or that they are incorrectly passing only a 2-digit year 291 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 292 * but this is not under our control. The libpng documentation has always 293 * stated that it works with 4-digit years, and the APIs have been 294 * documented as such. 295 * 296 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 297 * integer to hold the year, and can hold years as large as 65535. 298 * 299 * zlib, upon which libpng depends, is also Y2K compliant. It contains 300 * no date-related code. 301 * 302 * Glenn Randers-Pehrson 303 * libpng maintainer 304 * PNG Development Group 305 */ 306 307 #ifndef PNG_H 308 #define PNG_H 309 310 /* This is not the place to learn how to use libpng. The file libpng.txt 311 * describes how to use libpng, and the file example.c summarizes it 312 * with some code on which to build. This file is useful for looking 313 * at the actual function definitions and structure components. 314 */ 315 316 /* Version information for png.h - this should match the version in png.c */ 317 #define PNG_LIBPNG_VER_STRING "1.2.8" 318 #define PNG_HEADER_VERSION_STRING \ 319 " libpng version 1.2.8 - December 3, 2004 (header)\n" 320 321 #define PNG_LIBPNG_VER_SONUM 0 322 #define PNG_LIBPNG_VER_DLLNUM 13 323 324 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 325 #define PNG_LIBPNG_VER_MAJOR 1 326 #define PNG_LIBPNG_VER_MINOR 2 327 #define PNG_LIBPNG_VER_RELEASE 8 328 /* This should match the numeric part of the final component of 329 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ 330 331 #define PNG_LIBPNG_VER_BUILD 0 332 333 /* Release Status */ 334 #define PNG_LIBPNG_BUILD_ALPHA 1 335 #define PNG_LIBPNG_BUILD_BETA 2 336 #define PNG_LIBPNG_BUILD_RC 3 337 #define PNG_LIBPNG_BUILD_STABLE 4 338 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 339 340 /* Release-Specific Flags */ 341 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 342 PNG_LIBPNG_BUILD_STABLE only */ 343 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 344 PNG_LIBPNG_BUILD_SPECIAL */ 345 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 346 PNG_LIBPNG_BUILD_PRIVATE */ 347 348 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 349 350 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 351 * We must not include leading zeros. 352 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 353 * version 1.0.0 was mis-numbered 100 instead of 10000). From 354 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ 355 #define PNG_LIBPNG_VER 10208 /* 1.2.8 */ 356 357 #ifndef PNG_VERSION_INFO_ONLY 358 /* include the compression library's header */ 359 #include "zlib.h" 360 #endif 361 362 /* include all user configurable info, including optional assembler routines */ 363 #include "pngconf.h" 364 365 /* 366 * Added at libpng-1.2.8 */ 367 /* Ref MSDN: Private as priority over Special 368 * VS_FF_PRIVATEBUILD File *was not* built using standard release 369 * procedures. If this value is given, the StringFileInfo block must 370 * contain a PrivateBuild string. 371 * 372 * VS_FF_SPECIALBUILD File *was* built by the original company using 373 * standard release procedures but is a variation of the standard 374 * file of the same version number. If this value is given, the 375 * StringFileInfo block must contain a SpecialBuild string. 376 */ 377 378 #if defined(PNG_USER_PRIVATEBUILD) 379 # define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE | \ 380 PNG_LIBPNG_BUILD_PRIVATE 381 #else 382 # if defined(PNG_LIBPNG_SPECIALBUILD) 383 # define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE | \ 384 PNG_LIBPNG_BUILD_SPECIAL 385 # else 386 # define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE 387 # endif 388 #endif 389 390 #ifndef PNG_VERSION_INFO_ONLY 391 392 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 393 #ifdef __cplusplus 394 extern "C" { 395 #endif /* __cplusplus */ 396 397 /* This file is arranged in several sections. The first section contains 398 * structure and type definitions. The second section contains the external 399 * library functions, while the third has the internal library functions, 400 * which applications aren't expected to use directly. 401 */ 402 403 #ifndef PNG_NO_TYPECAST_NULL 404 #define int_p_NULL (int *)NULL 405 #define png_bytep_NULL (png_bytep)NULL 406 #define png_bytepp_NULL (png_bytepp)NULL 407 #define png_doublep_NULL (png_doublep)NULL 408 #define png_error_ptr_NULL (png_error_ptr)NULL 409 #define png_flush_ptr_NULL (png_flush_ptr)NULL 410 #define png_free_ptr_NULL (png_free_ptr)NULL 411 #define png_infopp_NULL (png_infopp)NULL 412 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 413 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 414 #define png_rw_ptr_NULL (png_rw_ptr)NULL 415 #define png_structp_NULL (png_structp)NULL 416 #define png_uint_16p_NULL (png_uint_16p)NULL 417 #define png_voidp_NULL (png_voidp)NULL 418 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 419 #else 420 #define int_p_NULL NULL 421 #define png_bytep_NULL NULL 422 #define png_bytepp_NULL NULL 423 #define png_doublep_NULL NULL 424 #define png_error_ptr_NULL NULL 425 #define png_flush_ptr_NULL NULL 426 #define png_free_ptr_NULL NULL 427 #define png_infopp_NULL NULL 428 #define png_malloc_ptr_NULL NULL 429 #define png_read_status_ptr_NULL NULL 430 #define png_rw_ptr_NULL NULL 431 #define png_structp_NULL NULL 432 #define png_uint_16p_NULL NULL 433 #define png_voidp_NULL NULL 434 #define png_write_status_ptr_NULL NULL 435 #endif 436 437 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 438 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 439 /* Version information for C files, stored in png.c. This had better match 440 * the version above. 441 */ 442 #ifdef PNG_USE_GLOBAL_ARRAYS 443 PNG_EXPORT_VAR (const char) png_libpng_ver[18]; 444 /* need room for 99.99.99beta99z */ 445 #else 446 #define png_libpng_ver png_get_header_ver(NULL) 447 #endif 448 449 #ifdef PNG_USE_GLOBAL_ARRAYS 450 /* This was removed in version 1.0.5c */ 451 /* Structures to facilitate easy interlacing. See png.c for more details */ 452 PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7]; 453 PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7]; 454 PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7]; 455 PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7]; 456 PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7]; 457 PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7]; 458 #ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW 459 PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7]; 460 #endif 461 /* This isn't currently used. If you need it, see png.c for more details. 462 PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7]; 463 */ 464 #endif 465 466 #endif /* PNG_NO_EXTERN */ 467 468 /* Three color definitions. The order of the red, green, and blue, (and the 469 * exact size) is not important, although the size of the fields need to 470 * be png_byte or png_uint_16 (as defined below). 471 */ 472 typedef struct png_color_struct 473 { 474 png_byte red; 475 png_byte green; 476 png_byte blue; 477 } png_color; 478 typedef png_color FAR * png_colorp; 479 typedef png_color FAR * FAR * png_colorpp; 480 481 typedef struct png_color_16_struct 482 { 483 png_byte index; /* used for palette files */ 484 png_uint_16 red; /* for use in red green blue files */ 485 png_uint_16 green; 486 png_uint_16 blue; 487 png_uint_16 gray; /* for use in grayscale files */ 488 } png_color_16; 489 typedef png_color_16 FAR * png_color_16p; 490 typedef png_color_16 FAR * FAR * png_color_16pp; 491 492 typedef struct png_color_8_struct 493 { 494 png_byte red; /* for use in red green blue files */ 495 png_byte green; 496 png_byte blue; 497 png_byte gray; /* for use in grayscale files */ 498 png_byte alpha; /* for alpha channel files */ 499 } png_color_8; 500 typedef png_color_8 FAR * png_color_8p; 501 typedef png_color_8 FAR * FAR * png_color_8pp; 502 503 /* 504 * The following two structures are used for the in-core representation 505 * of sPLT chunks. 506 */ 507 typedef struct png_sPLT_entry_struct 508 { 509 png_uint_16 red; 510 png_uint_16 green; 511 png_uint_16 blue; 512 png_uint_16 alpha; 513 png_uint_16 frequency; 514 } png_sPLT_entry; 515 typedef png_sPLT_entry FAR * png_sPLT_entryp; 516 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 517 518 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 519 * occupy the LSB of their respective members, and the MSB of each member 520 * is zero-filled. The frequency member always occupies the full 16 bits. 521 */ 522 523 typedef struct png_sPLT_struct 524 { 525 png_charp name; /* palette name */ 526 png_byte depth; /* depth of palette samples */ 527 png_sPLT_entryp entries; /* palette entries */ 528 png_int_32 nentries; /* number of palette entries */ 529 } png_sPLT_t; 530 typedef png_sPLT_t FAR * png_sPLT_tp; 531 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 532 533 #ifdef PNG_TEXT_SUPPORTED 534 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 535 * and whether that contents is compressed or not. The "key" field 536 * points to a regular zero-terminated C string. The "text", "lang", and 537 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 538 * However, the * structure returned by png_get_text() will always contain 539 * regular zero-terminated C strings (possibly empty), never NULL pointers, 540 * so they can be safely used in printf() and other string-handling functions. 541 */ 542 typedef struct png_text_struct 543 { 544 int compression; /* compression value: 545 -1: tEXt, none 546 0: zTXt, deflate 547 1: iTXt, none 548 2: iTXt, deflate */ 549 png_charp key; /* keyword, 1-79 character description of "text" */ 550 png_charp text; /* comment, may be an empty string (ie "") 551 or a NULL pointer */ 552 png_size_t text_length; /* length of the text string */ 553 #ifdef PNG_iTXt_SUPPORTED 554 png_size_t itxt_length; /* length of the itxt string */ 555 png_charp lang; /* language code, 0-79 characters 556 or a NULL pointer */ 557 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 558 chars or a NULL pointer */ 559 #endif 560 } png_text; 561 typedef png_text FAR * png_textp; 562 typedef png_text FAR * FAR * png_textpp; 563 #endif 564 565 /* Supported compression types for text in PNG files (tEXt, and zTXt). 566 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 567 #define PNG_TEXT_COMPRESSION_NONE_WR -3 568 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 569 #define PNG_TEXT_COMPRESSION_NONE -1 570 #define PNG_TEXT_COMPRESSION_zTXt 0 571 #define PNG_ITXT_COMPRESSION_NONE 1 572 #define PNG_ITXT_COMPRESSION_zTXt 2 573 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 574 575 /* png_time is a way to hold the time in an machine independent way. 576 * Two conversions are provided, both from time_t and struct tm. There 577 * is no portable way to convert to either of these structures, as far 578 * as I know. If you know of a portable way, send it to me. As a side 579 * note - PNG has always been Year 2000 compliant! 580 */ 581 typedef struct png_time_struct 582 { 583 png_uint_16 year; /* full year, as in, 1995 */ 584 png_byte month; /* month of year, 1 - 12 */ 585 png_byte day; /* day of month, 1 - 31 */ 586 png_byte hour; /* hour of day, 0 - 23 */ 587 png_byte minute; /* minute of hour, 0 - 59 */ 588 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 589 } png_time; 590 typedef png_time FAR * png_timep; 591 typedef png_time FAR * FAR * png_timepp; 592 593 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 594 /* png_unknown_chunk is a structure to hold queued chunks for which there is 595 * no specific support. The idea is that we can use this to queue 596 * up private chunks for output even though the library doesn't actually 597 * know about their semantics. 598 */ 599 typedef struct png_unknown_chunk_t 600 { 601 png_byte name[5]; 602 png_byte *data; 603 png_size_t size; 604 605 /* libpng-using applications should NOT directly modify this byte. */ 606 png_byte location; /* mode of operation at read time */ 607 } 608 png_unknown_chunk; 609 typedef png_unknown_chunk FAR * png_unknown_chunkp; 610 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 611 #endif 612 613 /* png_info is a structure that holds the information in a PNG file so 614 * that the application can find out the characteristics of the image. 615 * If you are reading the file, this structure will tell you what is 616 * in the PNG file. If you are writing the file, fill in the information 617 * you want to put into the PNG file, then call png_write_info(). 618 * The names chosen should be very close to the PNG specification, so 619 * consult that document for information about the meaning of each field. 620 * 621 * With libpng < 0.95, it was only possible to directly set and read the 622 * the values in the png_info_struct, which meant that the contents and 623 * order of the values had to remain fixed. With libpng 0.95 and later, 624 * however, there are now functions that abstract the contents of 625 * png_info_struct from the application, so this makes it easier to use 626 * libpng with dynamic libraries, and even makes it possible to use 627 * libraries that don't have all of the libpng ancillary chunk-handing 628 * functionality. 629 * 630 * In any case, the order of the parameters in png_info_struct should NOT 631 * be changed for as long as possible to keep compatibility with applications 632 * that use the old direct-access method with png_info_struct. 633 * 634 * The following members may have allocated storage attached that should be 635 * cleaned up before the structure is discarded: palette, trans, text, 636 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 637 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 638 * are automatically freed when the info structure is deallocated, if they were 639 * allocated internally by libpng. This behavior can be changed by means 640 * of the png_data_freer() function. 641 * 642 * More allocation details: all the chunk-reading functions that 643 * change these members go through the corresponding png_set_* 644 * functions. A function to clear these members is available: see 645 * png_free_data(). The png_set_* functions do not depend on being 646 * able to point info structure members to any of the storage they are 647 * passed (they make their own copies), EXCEPT that the png_set_text 648 * functions use the same storage passed to them in the text_ptr or 649 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 650 * functions do not make their own copies. 651 */ 652 typedef struct png_info_struct 653 { 654 /* the following are necessary for every PNG file */ 655 png_uint_32 width; /* width of image in pixels (from IHDR) */ 656 png_uint_32 height; /* height of image in pixels (from IHDR) */ 657 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 658 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 659 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 660 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 661 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 662 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 663 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 664 /* The following three should have been named *_method not *_type */ 665 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 666 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 667 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 668 669 /* The following is informational only on read, and not used on writes. */ 670 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 671 png_byte pixel_depth; /* number of bits per pixel */ 672 png_byte spare_byte; /* to align the data, and for future use */ 673 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 674 675 /* The rest of the data is optional. If you are reading, check the 676 * valid field to see if the information in these are valid. If you 677 * are writing, set the valid field to those chunks you want written, 678 * and initialize the appropriate fields below. 679 */ 680 681 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 682 /* The gAMA chunk describes the gamma characteristics of the system 683 * on which the image was created, normally in the range [1.0, 2.5]. 684 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 685 */ 686 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 687 #endif 688 689 #if defined(PNG_sRGB_SUPPORTED) 690 /* GR-P, 0.96a */ 691 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 692 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 693 #endif 694 695 #if defined(PNG_TEXT_SUPPORTED) 696 /* The tEXt, and zTXt chunks contain human-readable textual data in 697 * uncompressed, compressed, and optionally compressed forms, respectively. 698 * The data in "text" is an array of pointers to uncompressed, 699 * null-terminated C strings. Each chunk has a keyword that describes the 700 * textual data contained in that chunk. Keywords are not required to be 701 * unique, and the text string may be empty. Any number of text chunks may 702 * be in an image. 703 */ 704 int num_text; /* number of comments read/to write */ 705 int max_text; /* current size of text array */ 706 png_textp text; /* array of comments read/to write */ 707 #endif /* PNG_TEXT_SUPPORTED */ 708 709 #if defined(PNG_tIME_SUPPORTED) 710 /* The tIME chunk holds the last time the displayed image data was 711 * modified. See the png_time struct for the contents of this struct. 712 */ 713 png_time mod_time; 714 #endif 715 716 #if defined(PNG_sBIT_SUPPORTED) 717 /* The sBIT chunk specifies the number of significant high-order bits 718 * in the pixel data. Values are in the range [1, bit_depth], and are 719 * only specified for the channels in the pixel data. The contents of 720 * the low-order bits is not specified. Data is valid if 721 * (valid & PNG_INFO_sBIT) is non-zero. 722 */ 723 png_color_8 sig_bit; /* significant bits in color channels */ 724 #endif 725 726 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 727 defined(PNG_READ_BACKGROUND_SUPPORTED) 728 /* The tRNS chunk supplies transparency data for paletted images and 729 * other image types that don't need a full alpha channel. There are 730 * "num_trans" transparency values for a paletted image, stored in the 731 * same order as the palette colors, starting from index 0. Values 732 * for the data are in the range [0, 255], ranging from fully transparent 733 * to fully opaque, respectively. For non-paletted images, there is a 734 * single color specified that should be treated as fully transparent. 735 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 736 */ 737 png_bytep trans; /* transparent values for paletted image */ 738 png_color_16 trans_values; /* transparent color for non-palette image */ 739 #endif 740 741 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 742 /* The bKGD chunk gives the suggested image background color if the 743 * display program does not have its own background color and the image 744 * is needs to composited onto a background before display. The colors 745 * in "background" are normally in the same color space/depth as the 746 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 747 */ 748 png_color_16 background; 749 #endif 750 751 #if defined(PNG_oFFs_SUPPORTED) 752 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 753 * and downwards from the top-left corner of the display, page, or other 754 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 755 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 756 */ 757 png_int_32 x_offset; /* x offset on page */ 758 png_int_32 y_offset; /* y offset on page */ 759 png_byte offset_unit_type; /* offset units type */ 760 #endif 761 762 #if defined(PNG_pHYs_SUPPORTED) 763 /* The pHYs chunk gives the physical pixel density of the image for 764 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 765 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 766 */ 767 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 768 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 769 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 770 #endif 771 772 #if defined(PNG_hIST_SUPPORTED) 773 /* The hIST chunk contains the relative frequency or importance of the 774 * various palette entries, so that a viewer can intelligently select a 775 * reduced-color palette, if required. Data is an array of "num_palette" 776 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 777 * is non-zero. 778 */ 779 png_uint_16p hist; 780 #endif 781 782 #ifdef PNG_cHRM_SUPPORTED 783 /* The cHRM chunk describes the CIE color characteristics of the monitor 784 * on which the PNG was created. This data allows the viewer to do gamut 785 * mapping of the input image to ensure that the viewer sees the same 786 * colors in the image as the creator. Values are in the range 787 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 788 */ 789 #ifdef PNG_FLOATING_POINT_SUPPORTED 790 float x_white; 791 float y_white; 792 float x_red; 793 float y_red; 794 float x_green; 795 float y_green; 796 float x_blue; 797 float y_blue; 798 #endif 799 #endif 800 801 #if defined(PNG_pCAL_SUPPORTED) 802 /* The pCAL chunk describes a transformation between the stored pixel 803 * values and original physical data values used to create the image. 804 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 805 * range given by [pcal_X0, pcal_X1], and are further transformed by a 806 * (possibly non-linear) transformation function given by "pcal_type" 807 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 808 * defines below, and the PNG-Group's PNG extensions document for a 809 * complete description of the transformations and how they should be 810 * implemented, and for a description of the ASCII parameter strings. 811 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 812 */ 813 png_charp pcal_purpose; /* pCAL chunk description string */ 814 png_int_32 pcal_X0; /* minimum value */ 815 png_int_32 pcal_X1; /* maximum value */ 816 png_charp pcal_units; /* Latin-1 string giving physical units */ 817 png_charpp pcal_params; /* ASCII strings containing parameter values */ 818 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 819 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 820 #endif 821 822 /* New members added in libpng-1.0.6 */ 823 #ifdef PNG_FREE_ME_SUPPORTED 824 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 825 #endif 826 827 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 828 /* storage for unknown chunks that the library doesn't recognize. */ 829 png_unknown_chunkp unknown_chunks; 830 png_size_t unknown_chunks_num; 831 #endif 832 833 #if defined(PNG_iCCP_SUPPORTED) 834 /* iCCP chunk data. */ 835 png_charp iccp_name; /* profile name */ 836 png_charp iccp_profile; /* International Color Consortium profile data */ 837 /* Note to maintainer: should be png_bytep */ 838 png_uint_32 iccp_proflen; /* ICC profile data length */ 839 png_byte iccp_compression; /* Always zero */ 840 #endif 841 842 #if defined(PNG_sPLT_SUPPORTED) 843 /* data on sPLT chunks (there may be more than one). */ 844 png_sPLT_tp splt_palettes; 845 png_uint_32 splt_palettes_num; 846 #endif 847 848 #if defined(PNG_sCAL_SUPPORTED) 849 /* The sCAL chunk describes the actual physical dimensions of the 850 * subject matter of the graphic. The chunk contains a unit specification 851 * a byte value, and two ASCII strings representing floating-point 852 * values. The values are width and height corresponsing to one pixel 853 * in the image. This external representation is converted to double 854 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 855 */ 856 png_byte scal_unit; /* unit of physical scale */ 857 #ifdef PNG_FLOATING_POINT_SUPPORTED 858 double scal_pixel_width; /* width of one pixel */ 859 double scal_pixel_height; /* height of one pixel */ 860 #endif 861 #ifdef PNG_FIXED_POINT_SUPPORTED 862 png_charp scal_s_width; /* string containing height */ 863 png_charp scal_s_height; /* string containing width */ 864 #endif 865 #endif 866 867 #if defined(PNG_INFO_IMAGE_SUPPORTED) 868 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 869 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 870 png_bytepp row_pointers; /* the image bits */ 871 #endif 872 873 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 874 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 875 #endif 876 877 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 878 png_fixed_point int_x_white; 879 png_fixed_point int_y_white; 880 png_fixed_point int_x_red; 881 png_fixed_point int_y_red; 882 png_fixed_point int_x_green; 883 png_fixed_point int_y_green; 884 png_fixed_point int_x_blue; 885 png_fixed_point int_y_blue; 886 #endif 887 888 } png_info; 889 890 typedef png_info FAR * png_infop; 891 typedef png_info FAR * FAR * png_infopp; 892 893 /* Maximum positive integer used in PNG is (2^31)-1 */ 894 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 895 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 896 #define PNG_SIZE_MAX ((png_size_t)(-1)) 897 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 898 #define PNG_MAX_UINT PNG_UINT_31_MAX 899 900 /* These describe the color_type field in png_info. */ 901 /* color type masks */ 902 #define PNG_COLOR_MASK_PALETTE 1 903 #define PNG_COLOR_MASK_COLOR 2 904 #define PNG_COLOR_MASK_ALPHA 4 905 906 /* color types. Note that not all combinations are legal */ 907 #define PNG_COLOR_TYPE_GRAY 0 908 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 909 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 910 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 911 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 912 /* aliases */ 913 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 914 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 915 916 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 917 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 918 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 919 920 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 921 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 922 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 923 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 924 925 /* These are for the interlacing type. These values should NOT be changed. */ 926 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 927 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 928 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 929 930 /* These are for the oFFs chunk. These values should NOT be changed. */ 931 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 932 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 933 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 934 935 /* These are for the pCAL chunk. These values should NOT be changed. */ 936 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 937 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 938 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 939 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 940 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 941 942 /* These are for the sCAL chunk. These values should NOT be changed. */ 943 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 944 #define PNG_SCALE_METER 1 /* meters per pixel */ 945 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 946 #define PNG_SCALE_LAST 3 /* Not a valid value */ 947 948 /* These are for the pHYs chunk. These values should NOT be changed. */ 949 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 950 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 951 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 952 953 /* These are for the sRGB chunk. These values should NOT be changed. */ 954 #define PNG_sRGB_INTENT_PERCEPTUAL 0 955 #define PNG_sRGB_INTENT_RELATIVE 1 956 #define PNG_sRGB_INTENT_SATURATION 2 957 #define PNG_sRGB_INTENT_ABSOLUTE 3 958 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 959 960 /* This is for text chunks */ 961 #define PNG_KEYWORD_MAX_LENGTH 79 962 963 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 964 #define PNG_MAX_PALETTE_LENGTH 256 965 966 /* These determine if an ancillary chunk's data has been successfully read 967 * from the PNG header, or if the application has filled in the corresponding 968 * data in the info_struct to be written into the output file. The values 969 * of the PNG_INFO_<chunk> defines should NOT be changed. 970 */ 971 #define PNG_INFO_gAMA 0x0001 972 #define PNG_INFO_sBIT 0x0002 973 #define PNG_INFO_cHRM 0x0004 974 #define PNG_INFO_PLTE 0x0008 975 #define PNG_INFO_tRNS 0x0010 976 #define PNG_INFO_bKGD 0x0020 977 #define PNG_INFO_hIST 0x0040 978 #define PNG_INFO_pHYs 0x0080 979 #define PNG_INFO_oFFs 0x0100 980 #define PNG_INFO_tIME 0x0200 981 #define PNG_INFO_pCAL 0x0400 982 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 983 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 984 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 985 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 986 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 987 988 /* This is used for the transformation routines, as some of them 989 * change these values for the row. It also should enable using 990 * the routines for other purposes. 991 */ 992 typedef struct png_row_info_struct 993 { 994 png_uint_32 width; /* width of row */ 995 png_uint_32 rowbytes; /* number of bytes in row */ 996 png_byte color_type; /* color type of row */ 997 png_byte bit_depth; /* bit depth of row */ 998 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 999 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1000 } png_row_info; 1001 1002 typedef png_row_info FAR * png_row_infop; 1003 typedef png_row_info FAR * FAR * png_row_infopp; 1004 1005 /* These are the function types for the I/O functions and for the functions 1006 * that allow the user to override the default I/O functions with his or her 1007 * own. The png_error_ptr type should match that of user-supplied warning 1008 * and error functions, while the png_rw_ptr type should match that of the 1009 * user read/write data functions. 1010 */ 1011 typedef struct png_struct_def png_struct; 1012 typedef png_struct FAR * png_structp; 1013 1014 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1015 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1016 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1017 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1018 int)); 1019 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1020 int)); 1021 1022 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1023 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1024 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1025 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1026 png_uint_32, int)); 1027 #endif 1028 1029 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1030 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1031 defined(PNG_LEGACY_SUPPORTED) 1032 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1033 png_row_infop, png_bytep)); 1034 #endif 1035 1036 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1037 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1038 #endif 1039 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1040 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1041 #endif 1042 1043 /* Transform masks for the high-level interface */ 1044 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1045 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1046 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1047 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1048 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1049 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1050 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1051 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1052 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1053 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1054 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1055 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1056 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ 1057 1058 /* Flags for MNG supported features */ 1059 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1060 #define PNG_FLAG_MNG_FILTER_64 0x04 1061 #define PNG_ALL_MNG_FEATURES 0x05 1062 1063 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1064 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1065 1066 /* The structure that holds the information to read and write PNG files. 1067 * The only people who need to care about what is inside of this are the 1068 * people who will be modifying the library for their own special needs. 1069 * It should NOT be accessed directly by an application, except to store 1070 * the jmp_buf. 1071 */ 1072 1073 struct png_struct_def 1074 { 1075 #ifdef PNG_SETJMP_SUPPORTED 1076 jmp_buf jmpbuf; /* used in png_error */ 1077 #endif 1078 png_error_ptr error_fn; /* function for printing errors and aborting */ 1079 png_error_ptr warning_fn; /* function for printing warnings */ 1080 png_voidp error_ptr; /* user supplied struct for error functions */ 1081 png_rw_ptr write_data_fn; /* function for writing output data */ 1082 png_rw_ptr read_data_fn; /* function for reading input data */ 1083 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1084 1085 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1086 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1087 #endif 1088 1089 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1090 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1091 #endif 1092 1093 /* These were added in libpng-1.0.2 */ 1094 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1095 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1096 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1097 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1098 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1099 png_byte user_transform_channels; /* channels in user transformed pixels */ 1100 #endif 1101 #endif 1102 1103 png_uint_32 mode; /* tells us where we are in the PNG file */ 1104 png_uint_32 flags; /* flags indicating various things to libpng */ 1105 png_uint_32 transformations; /* which transformations to perform */ 1106 1107 z_stream zstream; /* pointer to decompression structure (below) */ 1108 png_bytep zbuf; /* buffer for zlib */ 1109 png_size_t zbuf_size; /* size of zbuf */ 1110 int zlib_level; /* holds zlib compression level */ 1111 int zlib_method; /* holds zlib compression method */ 1112 int zlib_window_bits; /* holds zlib compression window bits */ 1113 int zlib_mem_level; /* holds zlib compression memory level */ 1114 int zlib_strategy; /* holds zlib compression strategy */ 1115 1116 png_uint_32 width; /* width of image in pixels */ 1117 png_uint_32 height; /* height of image in pixels */ 1118 png_uint_32 num_rows; /* number of rows in current pass */ 1119 png_uint_32 usr_width; /* width of row at start of write */ 1120 png_uint_32 rowbytes; /* size of row in bytes */ 1121 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1122 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1123 png_uint_32 row_number; /* current row in interlace pass */ 1124 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1125 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1126 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1127 png_bytep up_row; /* buffer to save "up" row when filtering */ 1128 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1129 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1130 png_row_info row_info; /* used for transformation routines */ 1131 1132 png_uint_32 idat_size; /* current IDAT size for read */ 1133 png_uint_32 crc; /* current chunk CRC value */ 1134 png_colorp palette; /* palette from the input file */ 1135 png_uint_16 num_palette; /* number of color entries in palette */ 1136 png_uint_16 num_trans; /* number of transparency values */ 1137 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1138 png_byte compression; /* file compression type (always 0) */ 1139 png_byte filter; /* file filter type (always 0) */ 1140 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1141 png_byte pass; /* current interlace pass (0 - 6) */ 1142 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1143 png_byte color_type; /* color type of file */ 1144 png_byte bit_depth; /* bit depth of file */ 1145 png_byte usr_bit_depth; /* bit depth of users row */ 1146 png_byte pixel_depth; /* number of bits per pixel */ 1147 png_byte channels; /* number of channels in file */ 1148 png_byte usr_channels; /* channels at start of write */ 1149 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1150 1151 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1152 #ifdef PNG_LEGACY_SUPPORTED 1153 png_byte filler; /* filler byte for pixel expansion */ 1154 #else 1155 png_uint_16 filler; /* filler bytes for pixel expansion */ 1156 #endif 1157 #endif 1158 1159 #if defined(PNG_bKGD_SUPPORTED) 1160 png_byte background_gamma_type; 1161 # ifdef PNG_FLOATING_POINT_SUPPORTED 1162 float background_gamma; 1163 # endif 1164 png_color_16 background; /* background color in screen gamma space */ 1165 #if defined(PNG_READ_GAMMA_SUPPORTED) 1166 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1167 #endif 1168 #endif /* PNG_bKGD_SUPPORTED */ 1169 1170 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1171 png_flush_ptr output_flush_fn;/* Function for flushing output */ 1172 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1173 png_uint_32 flush_rows; /* number of rows written since last flush */ 1174 #endif 1175 1176 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1177 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1178 #ifdef PNG_FLOATING_POINT_SUPPORTED 1179 float gamma; /* file gamma value */ 1180 float screen_gamma; /* screen gamma value (display_exponent) */ 1181 #endif 1182 #endif 1183 1184 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1185 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1186 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1187 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1188 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1189 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1190 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1191 #endif 1192 1193 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1194 png_color_8 sig_bit; /* significant bits in each available channel */ 1195 #endif 1196 1197 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1198 png_color_8 shift; /* shift for significant bit tranformation */ 1199 #endif 1200 1201 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1202 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1203 png_bytep trans; /* transparency values for paletted files */ 1204 png_color_16 trans_values; /* transparency values for non-paletted files */ 1205 #endif 1206 1207 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1208 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1209 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1210 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1211 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1212 png_progressive_end_ptr end_fn; /* called after image is complete */ 1213 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1214 png_bytep save_buffer; /* buffer for previously read data */ 1215 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1216 png_bytep current_buffer; /* buffer for recently used data */ 1217 png_uint_32 push_length; /* size of current input chunk */ 1218 png_uint_32 skip_length; /* bytes to skip in input data */ 1219 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1220 png_size_t save_buffer_max; /* total size of save_buffer */ 1221 png_size_t buffer_size; /* total amount of available input data */ 1222 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1223 int process_mode; /* what push library is currently doing */ 1224 int cur_palette; /* current push library palette index */ 1225 1226 # if defined(PNG_TEXT_SUPPORTED) 1227 png_size_t current_text_size; /* current size of text input data */ 1228 png_size_t current_text_left; /* how much text left to read in input */ 1229 png_charp current_text; /* current text chunk buffer */ 1230 png_charp current_text_ptr; /* current location in current_text */ 1231 # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ 1232 1233 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1234 1235 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1236 /* for the Borland special 64K segment handler */ 1237 png_bytepp offset_table_ptr; 1238 png_bytep offset_table; 1239 png_uint_16 offset_table_number; 1240 png_uint_16 offset_table_count; 1241 png_uint_16 offset_table_count_free; 1242 #endif 1243 1244 #if defined(PNG_READ_DITHER_SUPPORTED) 1245 png_bytep palette_lookup; /* lookup table for dithering */ 1246 png_bytep dither_index; /* index translation for palette files */ 1247 #endif 1248 1249 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1250 png_uint_16p hist; /* histogram */ 1251 #endif 1252 1253 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1254 png_byte heuristic_method; /* heuristic for row filter selection */ 1255 png_byte num_prev_filters; /* number of weights for previous rows */ 1256 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1257 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1258 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1259 png_uint_16p filter_costs; /* relative filter calculation cost */ 1260 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1261 #endif 1262 1263 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1264 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1265 #endif 1266 1267 /* New members added in libpng-1.0.6 */ 1268 1269 #ifdef PNG_FREE_ME_SUPPORTED 1270 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1271 #endif 1272 1273 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1274 png_voidp user_chunk_ptr; 1275 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1276 #endif 1277 1278 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1279 int num_chunk_list; 1280 png_bytep chunk_list; 1281 #endif 1282 1283 /* New members added in libpng-1.0.3 */ 1284 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1285 png_byte rgb_to_gray_status; 1286 /* These were changed from png_byte in libpng-1.0.6 */ 1287 png_uint_16 rgb_to_gray_red_coeff; 1288 png_uint_16 rgb_to_gray_green_coeff; 1289 png_uint_16 rgb_to_gray_blue_coeff; 1290 #endif 1291 1292 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1293 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1294 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1295 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1296 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1297 #ifdef PNG_1_0_X 1298 png_byte mng_features_permitted; 1299 #else 1300 png_uint_32 mng_features_permitted; 1301 #endif /* PNG_1_0_X */ 1302 #endif 1303 1304 /* New member added in libpng-1.0.7 */ 1305 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1306 png_fixed_point int_gamma; 1307 #endif 1308 1309 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1310 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1311 png_byte filter_type; 1312 #endif 1313 1314 #if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)) 1315 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1316 png_uint_32 row_buf_size; 1317 #endif 1318 1319 /* New members added in libpng-1.2.0 */ 1320 #if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1321 png_byte mmx_bitdepth_threshold; 1322 png_uint_32 mmx_rowbytes_threshold; 1323 png_uint_32 asm_flags; 1324 #endif 1325 1326 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1327 #ifdef PNG_USER_MEM_SUPPORTED 1328 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1329 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1330 png_free_ptr free_fn; /* function for freeing memory */ 1331 #endif 1332 1333 /* New member added in libpng-1.0.13 and 1.2.0 */ 1334 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1335 1336 #if defined(PNG_READ_DITHER_SUPPORTED) 1337 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1338 png_bytep dither_sort; /* working sort array */ 1339 png_bytep index_to_palette; /* where the original index currently is */ 1340 /* in the palette */ 1341 png_bytep palette_to_index; /* which original index points to this */ 1342 /* palette color */ 1343 #endif 1344 1345 /* New members added in libpng-1.0.16 and 1.2.6 */ 1346 png_byte compression_type; 1347 1348 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1349 png_uint_32 user_width_max; 1350 png_uint_32 user_height_max; 1351 #endif 1352 1353 }; 1354 1355 1356 /* This triggers a compiler error in png.c, if png.c and png.h 1357 * do not agree upon the version number. 1358 */ 1359 typedef png_structp version_1_2_8; 1360 1361 typedef png_struct FAR * FAR * png_structpp; 1362 1363 /* Here are the function definitions most commonly used. This is not 1364 * the place to find out how to use libpng. See libpng.txt for the 1365 * full explanation, see example.c for the summary. This just provides 1366 * a simple one line description of the use of each function. 1367 */ 1368 1369 /* Returns the version number of the library */ 1370 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1371 1372 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1373 * Handling more than 8 bytes from the beginning of the file is an error. 1374 */ 1375 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1376 int num_bytes)); 1377 1378 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1379 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1380 * signature, and non-zero otherwise. Having num_to_check == 0 or 1381 * start > 7 will always fail (ie return non-zero). 1382 */ 1383 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1384 png_size_t num_to_check)); 1385 1386 /* Simple signature checking function. This is the same as calling 1387 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1388 */ 1389 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1390 1391 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1392 extern PNG_EXPORT(png_structp,png_create_read_struct) 1393 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1394 png_error_ptr error_fn, png_error_ptr warn_fn)); 1395 1396 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1397 extern PNG_EXPORT(png_structp,png_create_write_struct) 1398 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1399 png_error_ptr error_fn, png_error_ptr warn_fn)); 1400 1401 #ifdef PNG_WRITE_SUPPORTED 1402 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1403 PNGARG((png_structp png_ptr)); 1404 #endif 1405 1406 #ifdef PNG_WRITE_SUPPORTED 1407 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1408 PNGARG((png_structp png_ptr, png_uint_32 size)); 1409 #endif 1410 1411 /* Reset the compression stream */ 1412 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1413 1414 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1415 #ifdef PNG_USER_MEM_SUPPORTED 1416 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1417 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1418 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1419 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1420 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1421 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1422 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1423 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1424 #endif 1425 1426 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1427 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1428 png_bytep chunk_name, png_bytep data, png_size_t length)); 1429 1430 /* Write the start of a PNG chunk - length and chunk name. */ 1431 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1432 png_bytep chunk_name, png_uint_32 length)); 1433 1434 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1435 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1436 png_bytep data, png_size_t length)); 1437 1438 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1439 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1440 1441 /* Allocate and initialize the info structure */ 1442 extern PNG_EXPORT(png_infop,png_create_info_struct) 1443 PNGARG((png_structp png_ptr)); 1444 1445 /* Initialize the info structure (old interface - DEPRECATED) */ 1446 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1447 #undef png_info_init 1448 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1449 png_sizeof(png_info)); 1450 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1451 png_size_t png_info_struct_size)); 1452 1453 /* Writes all the PNG information before the image. */ 1454 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1455 png_infop info_ptr)); 1456 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1457 png_infop info_ptr)); 1458 1459 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1460 /* read the information before the actual image data. */ 1461 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1462 png_infop info_ptr)); 1463 #endif 1464 1465 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1466 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1467 PNGARG((png_structp png_ptr, png_timep ptime)); 1468 #endif 1469 1470 #if !defined(_WIN32_WCE) 1471 /* "time.h" functions are not supported on WindowsCE */ 1472 #if defined(PNG_WRITE_tIME_SUPPORTED) 1473 /* convert from a struct tm to png_time */ 1474 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1475 struct tm FAR * ttime)); 1476 1477 /* convert from time_t to png_time. Uses gmtime() */ 1478 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1479 time_t ttime)); 1480 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1481 #endif /* _WIN32_WCE */ 1482 1483 #if defined(PNG_READ_EXPAND_SUPPORTED) 1484 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1485 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1486 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1487 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1488 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1489 #endif 1490 1491 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1492 /* Use blue, green, red order for pixels. */ 1493 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1494 #endif 1495 1496 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1497 /* Expand the grayscale to 24-bit RGB if necessary. */ 1498 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1499 #endif 1500 1501 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1502 /* Reduce RGB to grayscale. */ 1503 #ifdef PNG_FLOATING_POINT_SUPPORTED 1504 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1505 int error_action, double red, double green )); 1506 #endif 1507 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1508 int error_action, png_fixed_point red, png_fixed_point green )); 1509 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1510 png_ptr)); 1511 #endif 1512 1513 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1514 png_colorp palette)); 1515 1516 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1517 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1518 #endif 1519 1520 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1521 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1522 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1523 #endif 1524 1525 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1526 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1527 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1528 #endif 1529 1530 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1531 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1532 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1533 png_uint_32 filler, int flags)); 1534 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1535 #define PNG_FILLER_BEFORE 0 1536 #define PNG_FILLER_AFTER 1 1537 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1538 #if !defined(PNG_1_0_X) 1539 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1540 png_uint_32 filler, int flags)); 1541 #endif 1542 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1543 1544 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1545 /* Swap bytes in 16-bit depth files. */ 1546 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1547 #endif 1548 1549 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1550 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1551 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1552 #endif 1553 1554 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1555 /* Swap packing order of pixels in bytes. */ 1556 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1557 #endif 1558 1559 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1560 /* Converts files to legal bit depths. */ 1561 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1562 png_color_8p true_bits)); 1563 #endif 1564 1565 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1566 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1567 /* Have the code handle the interlacing. Returns the number of passes. */ 1568 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1569 #endif 1570 1571 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1572 /* Invert monochrome files */ 1573 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1574 #endif 1575 1576 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1577 /* Handle alpha and tRNS by replacing with a background color. */ 1578 #ifdef PNG_FLOATING_POINT_SUPPORTED 1579 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1580 png_color_16p background_color, int background_gamma_code, 1581 int need_expand, double background_gamma)); 1582 #endif 1583 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1584 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1585 #define PNG_BACKGROUND_GAMMA_FILE 2 1586 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1587 #endif 1588 1589 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1590 /* strip the second byte of information from a 16-bit depth file. */ 1591 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1592 #endif 1593 1594 #if defined(PNG_READ_DITHER_SUPPORTED) 1595 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1596 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1597 png_colorp palette, int num_palette, int maximum_colors, 1598 png_uint_16p histogram, int full_dither)); 1599 #endif 1600 1601 #if defined(PNG_READ_GAMMA_SUPPORTED) 1602 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1603 #ifdef PNG_FLOATING_POINT_SUPPORTED 1604 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1605 double screen_gamma, double default_file_gamma)); 1606 #endif 1607 #endif 1608 1609 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1610 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1611 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1612 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1613 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1614 int empty_plte_permitted)); 1615 #endif 1616 1617 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1618 /* Set how many lines between output flushes - 0 for no flushing */ 1619 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1620 /* Flush the current PNG output buffer */ 1621 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1622 #endif 1623 1624 /* optional update palette with requested transformations */ 1625 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1626 1627 /* optional call to update the users info structure */ 1628 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1629 png_infop info_ptr)); 1630 1631 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1632 /* read one or more rows of image data. */ 1633 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1634 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1635 #endif 1636 1637 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1638 /* read a row of data. */ 1639 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1640 png_bytep row, 1641 png_bytep display_row)); 1642 #endif 1643 1644 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1645 /* read the whole image into memory at once. */ 1646 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1647 png_bytepp image)); 1648 #endif 1649 1650 /* write a row of image data */ 1651 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1652 png_bytep row)); 1653 1654 /* write a few rows of image data */ 1655 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1656 png_bytepp row, png_uint_32 num_rows)); 1657 1658 /* write the image data */ 1659 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1660 png_bytepp image)); 1661 1662 /* writes the end of the PNG file. */ 1663 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1664 png_infop info_ptr)); 1665 1666 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1667 /* read the end of the PNG file. */ 1668 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1669 png_infop info_ptr)); 1670 #endif 1671 1672 /* free any memory associated with the png_info_struct */ 1673 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1674 png_infopp info_ptr_ptr)); 1675 1676 /* free any memory associated with the png_struct and the png_info_structs */ 1677 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1678 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1679 1680 /* free all memory used by the read (old method - NOT DLL EXPORTED) */ 1681 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1682 png_infop end_info_ptr)); 1683 1684 /* free any memory associated with the png_struct and the png_info_structs */ 1685 extern PNG_EXPORT(void,png_destroy_write_struct) 1686 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1687 1688 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1689 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1690 1691 /* set the libpng method of handling chunk CRC errors */ 1692 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1693 int crit_action, int ancil_action)); 1694 1695 /* Values for png_set_crc_action() to say how to handle CRC errors in 1696 * ancillary and critical chunks, and whether to use the data contained 1697 * therein. Note that it is impossible to "discard" data in a critical 1698 * chunk. For versions prior to 0.90, the action was always error/quit, 1699 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1700 * chunks is warn/discard. These values should NOT be changed. 1701 * 1702 * value action:critical action:ancillary 1703 */ 1704 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1705 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1706 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1707 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1708 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1709 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1710 1711 /* These functions give the user control over the scan-line filtering in 1712 * libpng and the compression methods used by zlib. These functions are 1713 * mainly useful for testing, as the defaults should work with most users. 1714 * Those users who are tight on memory or want faster performance at the 1715 * expense of compression can modify them. See the compression library 1716 * header file (zlib.h) for an explination of the compression functions. 1717 */ 1718 1719 /* set the filtering method(s) used by libpng. Currently, the only valid 1720 * value for "method" is 0. 1721 */ 1722 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1723 int filters)); 1724 1725 /* Flags for png_set_filter() to say which filters to use. The flags 1726 * are chosen so that they don't conflict with real filter types 1727 * below, in case they are supplied instead of the #defined constants. 1728 * These values should NOT be changed. 1729 */ 1730 #define PNG_NO_FILTERS 0x00 1731 #define PNG_FILTER_NONE 0x08 1732 #define PNG_FILTER_SUB 0x10 1733 #define PNG_FILTER_UP 0x20 1734 #define PNG_FILTER_AVG 0x40 1735 #define PNG_FILTER_PAETH 0x80 1736 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1737 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1738 1739 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1740 * These defines should NOT be changed. 1741 */ 1742 #define PNG_FILTER_VALUE_NONE 0 1743 #define PNG_FILTER_VALUE_SUB 1 1744 #define PNG_FILTER_VALUE_UP 2 1745 #define PNG_FILTER_VALUE_AVG 3 1746 #define PNG_FILTER_VALUE_PAETH 4 1747 #define PNG_FILTER_VALUE_LAST 5 1748 1749 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1750 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1751 * defines, either the default (minimum-sum-of-absolute-differences), or 1752 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1753 * 1754 * Weights are factors >= 1.0, indicating how important it is to keep the 1755 * filter type consistent between rows. Larger numbers mean the current 1756 * filter is that many times as likely to be the same as the "num_weights" 1757 * previous filters. This is cumulative for each previous row with a weight. 1758 * There needs to be "num_weights" values in "filter_weights", or it can be 1759 * NULL if the weights aren't being specified. Weights have no influence on 1760 * the selection of the first row filter. Well chosen weights can (in theory) 1761 * improve the compression for a given image. 1762 * 1763 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1764 * filter type. Higher costs indicate more decoding expense, and are 1765 * therefore less likely to be selected over a filter with lower computational 1766 * costs. There needs to be a value in "filter_costs" for each valid filter 1767 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1768 * setting the costs. Costs try to improve the speed of decompression without 1769 * unduly increasing the compressed image size. 1770 * 1771 * A negative weight or cost indicates the default value is to be used, and 1772 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1773 * The default values for both weights and costs are currently 1.0, but may 1774 * change if good general weighting/cost heuristics can be found. If both 1775 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1776 * to the UNWEIGHTED method, but with added encoding time/computation. 1777 */ 1778 #ifdef PNG_FLOATING_POINT_SUPPORTED 1779 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1780 int heuristic_method, int num_weights, png_doublep filter_weights, 1781 png_doublep filter_costs)); 1782 #endif 1783 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1784 1785 /* Heuristic used for row filter selection. These defines should NOT be 1786 * changed. 1787 */ 1788 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1789 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1790 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1791 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1792 1793 /* Set the library compression level. Currently, valid values range from 1794 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1795 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1796 * shown that zlib compression levels 3-6 usually perform as well as level 9 1797 * for PNG images, and do considerably fewer caclulations. In the future, 1798 * these values may not correspond directly to the zlib compression levels. 1799 */ 1800 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1801 int level)); 1802 1803 extern PNG_EXPORT(void,png_set_compression_mem_level) 1804 PNGARG((png_structp png_ptr, int mem_level)); 1805 1806 extern PNG_EXPORT(void,png_set_compression_strategy) 1807 PNGARG((png_structp png_ptr, int strategy)); 1808 1809 extern PNG_EXPORT(void,png_set_compression_window_bits) 1810 PNGARG((png_structp png_ptr, int window_bits)); 1811 1812 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1813 int method)); 1814 1815 /* These next functions are called for input/output, memory, and error 1816 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1817 * and call standard C I/O routines such as fread(), fwrite(), and 1818 * fprintf(). These functions can be made to use other I/O routines 1819 * at run time for those applications that need to handle I/O in a 1820 * different manner by calling png_set_???_fn(). See libpng.txt for 1821 * more information. 1822 */ 1823 1824 #if !defined(PNG_NO_STDIO) 1825 /* Initialize the input/output for the PNG file to the default functions. */ 1826 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1827 #endif 1828 1829 /* Replace the (error and abort), and warning functions with user 1830 * supplied functions. If no messages are to be printed you must still 1831 * write and use replacement functions. The replacement error_fn should 1832 * still do a longjmp to the last setjmp location if you are using this 1833 * method of error handling. If error_fn or warning_fn is NULL, the 1834 * default function will be used. 1835 */ 1836 1837 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1838 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1839 1840 /* Return the user pointer associated with the error functions */ 1841 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1842 1843 /* Replace the default data output functions with a user supplied one(s). 1844 * If buffered output is not used, then output_flush_fn can be set to NULL. 1845 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1846 * output_flush_fn will be ignored (and thus can be NULL). 1847 */ 1848 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 1849 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 1850 1851 /* Replace the default data input function with a user supplied one. */ 1852 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 1853 png_voidp io_ptr, png_rw_ptr read_data_fn)); 1854 1855 /* Return the user pointer associated with the I/O functions */ 1856 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 1857 1858 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 1859 png_read_status_ptr read_row_fn)); 1860 1861 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 1862 png_write_status_ptr write_row_fn)); 1863 1864 #ifdef PNG_USER_MEM_SUPPORTED 1865 /* Replace the default memory allocation functions with user supplied one(s). */ 1866 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 1867 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1868 /* Return the user pointer associated with the memory functions */ 1869 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 1870 #endif 1871 1872 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1873 defined(PNG_LEGACY_SUPPORTED) 1874 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 1875 png_ptr, png_user_transform_ptr read_user_transform_fn)); 1876 #endif 1877 1878 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1879 defined(PNG_LEGACY_SUPPORTED) 1880 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 1881 png_ptr, png_user_transform_ptr write_user_transform_fn)); 1882 #endif 1883 1884 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1885 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1886 defined(PNG_LEGACY_SUPPORTED) 1887 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 1888 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 1889 int user_transform_channels)); 1890 /* Return the user pointer associated with the user transform functions */ 1891 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 1892 PNGARG((png_structp png_ptr)); 1893 #endif 1894 1895 #ifdef PNG_USER_CHUNKS_SUPPORTED 1896 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 1897 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 1898 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 1899 png_ptr)); 1900 #endif 1901 1902 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1903 /* Sets the function callbacks for the push reader, and a pointer to a 1904 * user-defined structure available to the callback functions. 1905 */ 1906 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 1907 png_voidp progressive_ptr, 1908 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 1909 png_progressive_end_ptr end_fn)); 1910 1911 /* returns the user pointer associated with the push read functions */ 1912 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 1913 PNGARG((png_structp png_ptr)); 1914 1915 /* function to be called when data becomes available */ 1916 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 1917 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 1918 1919 /* function that combines rows. Not very much different than the 1920 * png_combine_row() call. Is this even used????? 1921 */ 1922 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 1923 png_bytep old_row, png_bytep new_row)); 1924 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1925 1926 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 1927 png_uint_32 size)); 1928 1929 #if defined(PNG_1_0_X) 1930 # define png_malloc_warn png_malloc 1931 #else 1932 /* Added at libpng version 1.2.4 */ 1933 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 1934 png_uint_32 size)); 1935 #endif 1936 1937 /* frees a pointer allocated by png_malloc() */ 1938 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 1939 1940 #if defined(PNG_1_0_X) 1941 /* Function to allocate memory for zlib. */ 1942 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 1943 uInt size)); 1944 1945 /* Function to free memory for zlib */ 1946 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 1947 #endif 1948 1949 /* Free data that was allocated internally */ 1950 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 1951 png_infop info_ptr, png_uint_32 free_me, int num)); 1952 #ifdef PNG_FREE_ME_SUPPORTED 1953 /* Reassign responsibility for freeing existing data, whether allocated 1954 * by libpng or by the application */ 1955 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 1956 png_infop info_ptr, int freer, png_uint_32 mask)); 1957 #endif 1958 /* assignments for png_data_freer */ 1959 #define PNG_DESTROY_WILL_FREE_DATA 1 1960 #define PNG_SET_WILL_FREE_DATA 1 1961 #define PNG_USER_WILL_FREE_DATA 2 1962 /* Flags for png_ptr->free_me and info_ptr->free_me */ 1963 #define PNG_FREE_HIST 0x0008 1964 #define PNG_FREE_ICCP 0x0010 1965 #define PNG_FREE_SPLT 0x0020 1966 #define PNG_FREE_ROWS 0x0040 1967 #define PNG_FREE_PCAL 0x0080 1968 #define PNG_FREE_SCAL 0x0100 1969 #define PNG_FREE_UNKN 0x0200 1970 #define PNG_FREE_LIST 0x0400 1971 #define PNG_FREE_PLTE 0x1000 1972 #define PNG_FREE_TRNS 0x2000 1973 #define PNG_FREE_TEXT 0x4000 1974 #define PNG_FREE_ALL 0x7fff 1975 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 1976 1977 #ifdef PNG_USER_MEM_SUPPORTED 1978 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 1979 png_uint_32 size)); 1980 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 1981 png_voidp ptr)); 1982 #endif 1983 1984 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 1985 png_voidp s1, png_voidp s2, png_uint_32 size)); 1986 1987 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 1988 png_voidp s1, int value, png_uint_32 size)); 1989 1990 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 1991 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 1992 int check)); 1993 #endif /* USE_FAR_KEYWORD */ 1994 1995 /* Fatal error in PNG image of libpng - can't continue */ 1996 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 1997 png_const_charp error_message)); 1998 1999 /* The same, but the chunk name is prepended to the error string. */ 2000 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2001 png_const_charp error_message)); 2002 2003 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2004 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2005 png_const_charp warning_message)); 2006 2007 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2008 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2009 png_const_charp warning_message)); 2010 2011 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2012 * Similarly, the png_get_<chunk> calls are used to read values from the 2013 * png_info_struct, either storing the parameters in the passed variables, or 2014 * setting pointers into the png_info_struct where the data is stored. The 2015 * png_get_<chunk> functions return a non-zero value if the data was available 2016 * in info_ptr, or return zero and do not change any of the parameters if the 2017 * data was not available. 2018 * 2019 * These functions should be used instead of directly accessing png_info 2020 * to avoid problems with future changes in the size and internal layout of 2021 * png_info_struct. 2022 */ 2023 /* Returns "flag" if chunk data is valid in info_ptr. */ 2024 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2025 png_infop info_ptr, png_uint_32 flag)); 2026 2027 /* Returns number of bytes needed to hold a transformed row. */ 2028 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2029 png_infop info_ptr)); 2030 2031 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2032 /* Returns row_pointers, which is an array of pointers to scanlines that was 2033 returned from png_read_png(). */ 2034 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2035 png_infop info_ptr)); 2036 /* Set row_pointers, which is an array of pointers to scanlines for use 2037 by png_write_png(). */ 2038 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2039 png_infop info_ptr, png_bytepp row_pointers)); 2040 #endif 2041 2042 /* Returns number of color channels in image. */ 2043 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2044 png_infop info_ptr)); 2045 2046 #ifdef PNG_EASY_ACCESS_SUPPORTED 2047 /* Returns image width in pixels. */ 2048 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2049 png_ptr, png_infop info_ptr)); 2050 2051 /* Returns image height in pixels. */ 2052 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2053 png_ptr, png_infop info_ptr)); 2054 2055 /* Returns image bit_depth. */ 2056 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2057 png_ptr, png_infop info_ptr)); 2058 2059 /* Returns image color_type. */ 2060 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2061 png_ptr, png_infop info_ptr)); 2062 2063 /* Returns image filter_type. */ 2064 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2065 png_ptr, png_infop info_ptr)); 2066 2067 /* Returns image interlace_type. */ 2068 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2069 png_ptr, png_infop info_ptr)); 2070 2071 /* Returns image compression_type. */ 2072 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2073 png_ptr, png_infop info_ptr)); 2074 2075 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2076 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2077 png_ptr, png_infop info_ptr)); 2078 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2079 png_ptr, png_infop info_ptr)); 2080 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2081 png_ptr, png_infop info_ptr)); 2082 2083 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2084 #ifdef PNG_FLOATING_POINT_SUPPORTED 2085 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2086 png_ptr, png_infop info_ptr)); 2087 #endif 2088 2089 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2090 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2091 png_ptr, png_infop info_ptr)); 2092 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2093 png_ptr, png_infop info_ptr)); 2094 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2095 png_ptr, png_infop info_ptr)); 2096 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2097 png_ptr, png_infop info_ptr)); 2098 2099 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2100 2101 /* Returns pointer to signature string read from PNG header */ 2102 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2103 png_infop info_ptr)); 2104 2105 #if defined(PNG_bKGD_SUPPORTED) 2106 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2107 png_infop info_ptr, png_color_16p *background)); 2108 #endif 2109 2110 #if defined(PNG_bKGD_SUPPORTED) 2111 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2112 png_infop info_ptr, png_color_16p background)); 2113 #endif 2114 2115 #if defined(PNG_cHRM_SUPPORTED) 2116 #ifdef PNG_FLOATING_POINT_SUPPORTED 2117 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2118 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2119 double *red_y, double *green_x, double *green_y, double *blue_x, 2120 double *blue_y)); 2121 #endif 2122 #ifdef PNG_FIXED_POINT_SUPPORTED 2123 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2124 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2125 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2126 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2127 *int_blue_x, png_fixed_point *int_blue_y)); 2128 #endif 2129 #endif 2130 2131 #if defined(PNG_cHRM_SUPPORTED) 2132 #ifdef PNG_FLOATING_POINT_SUPPORTED 2133 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2134 png_infop info_ptr, double white_x, double white_y, double red_x, 2135 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2136 #endif 2137 #ifdef PNG_FIXED_POINT_SUPPORTED 2138 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2139 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2140 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2141 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2142 png_fixed_point int_blue_y)); 2143 #endif 2144 #endif 2145 2146 #if defined(PNG_gAMA_SUPPORTED) 2147 #ifdef PNG_FLOATING_POINT_SUPPORTED 2148 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2149 png_infop info_ptr, double *file_gamma)); 2150 #endif 2151 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2152 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2153 #endif 2154 2155 #if defined(PNG_gAMA_SUPPORTED) 2156 #ifdef PNG_FLOATING_POINT_SUPPORTED 2157 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2158 png_infop info_ptr, double file_gamma)); 2159 #endif 2160 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2161 png_infop info_ptr, png_fixed_point int_file_gamma)); 2162 #endif 2163 2164 #if defined(PNG_hIST_SUPPORTED) 2165 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2166 png_infop info_ptr, png_uint_16p *hist)); 2167 #endif 2168 2169 #if defined(PNG_hIST_SUPPORTED) 2170 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2171 png_infop info_ptr, png_uint_16p hist)); 2172 #endif 2173 2174 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2175 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2176 int *bit_depth, int *color_type, int *interlace_method, 2177 int *compression_method, int *filter_method)); 2178 2179 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2180 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2181 int color_type, int interlace_method, int compression_method, 2182 int filter_method)); 2183 2184 #if defined(PNG_oFFs_SUPPORTED) 2185 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2186 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2187 int *unit_type)); 2188 #endif 2189 2190 #if defined(PNG_oFFs_SUPPORTED) 2191 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2192 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2193 int unit_type)); 2194 #endif 2195 2196 #if defined(PNG_pCAL_SUPPORTED) 2197 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2198 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2199 int *type, int *nparams, png_charp *units, png_charpp *params)); 2200 #endif 2201 2202 #if defined(PNG_pCAL_SUPPORTED) 2203 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2204 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2205 int type, int nparams, png_charp units, png_charpp params)); 2206 #endif 2207 2208 #if defined(PNG_pHYs_SUPPORTED) 2209 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2210 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2211 #endif 2212 2213 #if defined(PNG_pHYs_SUPPORTED) 2214 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2215 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2216 #endif 2217 2218 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2219 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2220 2221 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2222 png_infop info_ptr, png_colorp palette, int num_palette)); 2223 2224 #if defined(PNG_sBIT_SUPPORTED) 2225 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2226 png_infop info_ptr, png_color_8p *sig_bit)); 2227 #endif 2228 2229 #if defined(PNG_sBIT_SUPPORTED) 2230 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2231 png_infop info_ptr, png_color_8p sig_bit)); 2232 #endif 2233 2234 #if defined(PNG_sRGB_SUPPORTED) 2235 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2236 png_infop info_ptr, int *intent)); 2237 #endif 2238 2239 #if defined(PNG_sRGB_SUPPORTED) 2240 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2241 png_infop info_ptr, int intent)); 2242 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2243 png_infop info_ptr, int intent)); 2244 #endif 2245 2246 #if defined(PNG_iCCP_SUPPORTED) 2247 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2248 png_infop info_ptr, png_charpp name, int *compression_type, 2249 png_charpp profile, png_uint_32 *proflen)); 2250 /* Note to maintainer: profile should be png_bytepp */ 2251 #endif 2252 2253 #if defined(PNG_iCCP_SUPPORTED) 2254 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2255 png_infop info_ptr, png_charp name, int compression_type, 2256 png_charp profile, png_uint_32 proflen)); 2257 /* Note to maintainer: profile should be png_bytep */ 2258 #endif 2259 2260 #if defined(PNG_sPLT_SUPPORTED) 2261 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2262 png_infop info_ptr, png_sPLT_tpp entries)); 2263 #endif 2264 2265 #if defined(PNG_sPLT_SUPPORTED) 2266 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2267 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2268 #endif 2269 2270 #if defined(PNG_TEXT_SUPPORTED) 2271 /* png_get_text also returns the number of text chunks in *num_text */ 2272 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2273 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2274 #endif 2275 2276 /* 2277 * Note while png_set_text() will accept a structure whose text, 2278 * language, and translated keywords are NULL pointers, the structure 2279 * returned by png_get_text will always contain regular 2280 * zero-terminated C strings. They might be empty strings but 2281 * they will never be NULL pointers. 2282 */ 2283 2284 #if defined(PNG_TEXT_SUPPORTED) 2285 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2286 png_infop info_ptr, png_textp text_ptr, int num_text)); 2287 #endif 2288 2289 #if defined(PNG_tIME_SUPPORTED) 2290 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2291 png_infop info_ptr, png_timep *mod_time)); 2292 #endif 2293 2294 #if defined(PNG_tIME_SUPPORTED) 2295 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2296 png_infop info_ptr, png_timep mod_time)); 2297 #endif 2298 2299 #if defined(PNG_tRNS_SUPPORTED) 2300 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2301 png_infop info_ptr, png_bytep *trans, int *num_trans, 2302 png_color_16p *trans_values)); 2303 #endif 2304 2305 #if defined(PNG_tRNS_SUPPORTED) 2306 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2307 png_infop info_ptr, png_bytep trans, int num_trans, 2308 png_color_16p trans_values)); 2309 #endif 2310 2311 #if defined(PNG_tRNS_SUPPORTED) 2312 #endif 2313 2314 #if defined(PNG_sCAL_SUPPORTED) 2315 #ifdef PNG_FLOATING_POINT_SUPPORTED 2316 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2317 png_infop info_ptr, int *unit, double *width, double *height)); 2318 #else 2319 #ifdef PNG_FIXED_POINT_SUPPORTED 2320 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2321 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2322 #endif 2323 #endif 2324 #endif /* PNG_sCAL_SUPPORTED */ 2325 2326 #if defined(PNG_sCAL_SUPPORTED) 2327 #ifdef PNG_FLOATING_POINT_SUPPORTED 2328 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2329 png_infop info_ptr, int unit, double width, double height)); 2330 #endif 2331 #ifdef PNG_FIXED_POINT_SUPPORTED 2332 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2333 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2334 #endif 2335 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2336 2337 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2338 /* provide a list of chunks and how they are to be handled, if the built-in 2339 handling or default unknown chunk handling is not desired. Any chunks not 2340 listed will be handled in the default manner. The IHDR and IEND chunks 2341 must not be listed. 2342 keep = 0: follow default behavour 2343 = 1: do not keep 2344 = 2: keep only if safe-to-copy 2345 = 3: keep even if unsafe-to-copy 2346 */ 2347 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2348 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2349 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2350 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2351 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2352 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2353 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2354 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2355 #endif 2356 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2357 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2358 chunk_name)); 2359 #endif 2360 2361 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2362 If you need to turn it off for a chunk that your application has freed, 2363 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ 2364 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2365 png_infop info_ptr, int mask)); 2366 2367 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2368 /* The "params" pointer is currently not used and is for future expansion. */ 2369 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2370 png_infop info_ptr, 2371 int transforms, 2372 png_voidp params)); 2373 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2374 png_infop info_ptr, 2375 int transforms, 2376 png_voidp params)); 2377 #endif 2378 2379 /* Define PNG_DEBUG at compile time for debugging information. Higher 2380 * numbers for PNG_DEBUG mean more debugging information. This has 2381 * only been added since version 0.95 so it is not implemented throughout 2382 * libpng yet, but more support will be added as needed. 2383 */ 2384 #ifdef PNG_DEBUG 2385 #if (PNG_DEBUG > 0) 2386 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2387 #include <crtdbg.h> 2388 #if (PNG_DEBUG > 1) 2389 #define png_debug(l,m) _RPT0(_CRT_WARN,m) 2390 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) 2391 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) 2392 #endif 2393 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2394 #ifndef PNG_DEBUG_FILE 2395 #define PNG_DEBUG_FILE stderr 2396 #endif /* PNG_DEBUG_FILE */ 2397 #if (PNG_DEBUG > 1) 2398 #define png_debug(l,m) \ 2399 { \ 2400 int num_tabs=l; \ 2401 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2402 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2403 } 2404 #define png_debug1(l,m,p1) \ 2405 { \ 2406 int num_tabs=l; \ 2407 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2408 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2409 } 2410 #define png_debug2(l,m,p1,p2) \ 2411 { \ 2412 int num_tabs=l; \ 2413 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2414 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2415 } 2416 #endif /* (PNG_DEBUG > 1) */ 2417 #endif /* _MSC_VER */ 2418 #endif /* (PNG_DEBUG > 0) */ 2419 #endif /* PNG_DEBUG */ 2420 #ifndef png_debug 2421 #define png_debug(l, m) 2422 #endif 2423 #ifndef png_debug1 2424 #define png_debug1(l, m, p1) 2425 #endif 2426 #ifndef png_debug2 2427 #define png_debug2(l, m, p1, p2) 2428 #endif 2429 2430 extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void)); 2431 2432 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2433 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2434 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2435 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2436 2437 #ifdef PNG_MNG_FEATURES_SUPPORTED 2438 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2439 png_ptr, png_uint_32 mng_features_permitted)); 2440 #endif 2441 2442 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2443 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2444 #define PNG_HANDLE_CHUNK_NEVER 1 2445 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2446 #define PNG_HANDLE_CHUNK_ALWAYS 3 2447 2448 /* Added to version 1.2.0 */ 2449 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2450 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2451 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2452 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2453 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2454 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2455 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2456 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2457 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2458 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2459 2460 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2461 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2462 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2463 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2464 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2465 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2466 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2467 2468 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2469 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2470 | PNG_MMX_READ_FLAGS \ 2471 | PNG_MMX_WRITE_FLAGS ) 2472 2473 #define PNG_SELECT_READ 1 2474 #define PNG_SELECT_WRITE 2 2475 2476 #if !defined(PNG_1_0_X) 2477 /* pngget.c */ 2478 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2479 PNGARG((int flag_select, int *compilerID)); 2480 2481 /* pngget.c */ 2482 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2483 PNGARG((int flag_select)); 2484 2485 /* pngget.c */ 2486 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2487 PNGARG((png_structp png_ptr)); 2488 2489 /* pngget.c */ 2490 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2491 PNGARG((png_structp png_ptr)); 2492 2493 /* pngget.c */ 2494 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2495 PNGARG((png_structp png_ptr)); 2496 2497 /* pngset.c */ 2498 extern PNG_EXPORT(void,png_set_asm_flags) 2499 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2500 2501 /* pngset.c */ 2502 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2503 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2504 png_uint_32 mmx_rowbytes_threshold)); 2505 2506 #endif /* PNG_1_0_X */ 2507 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2508 2509 #if !defined(PNG_1_0_X) 2510 /* png.c, pnggccrd.c, or pngvcrd.c */ 2511 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2512 2513 /* Strip the prepended error numbers ("#nnn ") from error and warning 2514 * messages before passing them to the error or warning handler. */ 2515 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2516 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2517 png_ptr, png_uint_32 strip_mode)); 2518 #endif 2519 2520 #endif /* PNG_1_0_X */ 2521 2522 /* Added at libpng-1.2.6 */ 2523 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2524 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2525 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2526 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2527 png_ptr)); 2528 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2529 png_ptr)); 2530 #endif 2531 2532 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ 2533 2534 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2535 /* With these routines we avoid an integer divide, which will be slower on 2536 * most machines. However, it does take more operations than the corresponding 2537 * divide method, so it may be slower on a few RISC systems. There are two 2538 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2539 * 2540 * Note that the rounding factors are NOT supposed to be the same! 128 and 2541 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2542 * standard method. 2543 * 2544 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2545 */ 2546 2547 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2548 2549 # define png_composite(composite, fg, alpha, bg) \ 2550 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2551 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2552 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2553 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2554 2555 # define png_composite_16(composite, fg, alpha, bg) \ 2556 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2557 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2558 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2559 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2560 2561 #else /* standard method using integer division */ 2562 2563 # define png_composite(composite, fg, alpha, bg) \ 2564 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2565 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2566 (png_uint_16)127) / 255) 2567 2568 # define png_composite_16(composite, fg, alpha, bg) \ 2569 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2570 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2571 (png_uint_32)32767) / (png_uint_32)65535L) 2572 2573 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2574 2575 /* These next functions are used internally in the code. They generally 2576 * shouldn't be used unless you are writing code to add or replace some 2577 * functionality in libpng. More information about most functions can 2578 * be found in the files where the functions are located. 2579 */ 2580 2581 #if defined(PNG_INTERNAL) 2582 2583 /* Various modes of operation. Note that after an init, mode is set to 2584 * zero automatically when the structure is created. 2585 */ 2586 #define PNG_HAVE_IHDR 0x01 2587 #define PNG_HAVE_PLTE 0x02 2588 #define PNG_HAVE_IDAT 0x04 2589 #define PNG_AFTER_IDAT 0x08 2590 #define PNG_HAVE_IEND 0x10 2591 #define PNG_HAVE_gAMA 0x20 2592 #define PNG_HAVE_cHRM 0x40 2593 #define PNG_HAVE_sRGB 0x80 2594 #define PNG_HAVE_CHUNK_HEADER 0x100 2595 #define PNG_WROTE_tIME 0x200 2596 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2597 #define PNG_BACKGROUND_IS_GRAY 0x800 2598 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2599 2600 /* flags for the transformations the PNG library does on the image data */ 2601 #define PNG_BGR 0x0001 2602 #define PNG_INTERLACE 0x0002 2603 #define PNG_PACK 0x0004 2604 #define PNG_SHIFT 0x0008 2605 #define PNG_SWAP_BYTES 0x0010 2606 #define PNG_INVERT_MONO 0x0020 2607 #define PNG_DITHER 0x0040 2608 #define PNG_BACKGROUND 0x0080 2609 #define PNG_BACKGROUND_EXPAND 0x0100 2610 /* 0x0200 unused */ 2611 #define PNG_16_TO_8 0x0400 2612 #define PNG_RGBA 0x0800 2613 #define PNG_EXPAND 0x1000 2614 #define PNG_GAMMA 0x2000 2615 #define PNG_GRAY_TO_RGB 0x4000 2616 #define PNG_FILLER 0x8000L 2617 #define PNG_PACKSWAP 0x10000L 2618 #define PNG_SWAP_ALPHA 0x20000L 2619 #define PNG_STRIP_ALPHA 0x40000L 2620 #define PNG_INVERT_ALPHA 0x80000L 2621 #define PNG_USER_TRANSFORM 0x100000L 2622 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2623 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2624 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2625 /* 0x800000L Unused */ 2626 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2627 /* 0x2000000L unused */ 2628 /* 0x4000000L unused */ 2629 /* 0x8000000L unused */ 2630 /* 0x10000000L unused */ 2631 /* 0x20000000L unused */ 2632 /* 0x40000000L unused */ 2633 2634 /* flags for png_create_struct */ 2635 #define PNG_STRUCT_PNG 0x0001 2636 #define PNG_STRUCT_INFO 0x0002 2637 2638 /* Scaling factor for filter heuristic weighting calculations */ 2639 #define PNG_WEIGHT_SHIFT 8 2640 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2641 #define PNG_COST_SHIFT 3 2642 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2643 2644 /* flags for the png_ptr->flags rather than declaring a byte for each one */ 2645 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2646 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2647 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2648 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2649 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2650 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2651 #define PNG_FLAG_ROW_INIT 0x0040 2652 #define PNG_FLAG_FILLER_AFTER 0x0080 2653 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2654 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2655 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2656 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2657 #define PNG_FLAG_FREE_PLTE 0x1000 2658 #define PNG_FLAG_FREE_TRNS 0x2000 2659 #define PNG_FLAG_FREE_HIST 0x4000 2660 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2661 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2662 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2663 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2664 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2665 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2666 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2667 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2668 /* 0x800000L unused */ 2669 /* 0x1000000L unused */ 2670 /* 0x2000000L unused */ 2671 /* 0x4000000L unused */ 2672 /* 0x8000000L unused */ 2673 /* 0x10000000L unused */ 2674 /* 0x20000000L unused */ 2675 /* 0x40000000L unused */ 2676 2677 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2678 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2679 2680 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2681 PNG_FLAG_CRC_CRITICAL_IGNORE) 2682 2683 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2684 PNG_FLAG_CRC_CRITICAL_MASK) 2685 2686 /* save typing and make code easier to understand */ 2687 2688 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2689 abs((int)((c1).green) - (int)((c2).green)) + \ 2690 abs((int)((c1).blue) - (int)((c2).blue))) 2691 2692 /* Added to libpng-1.2.6 JB */ 2693 #define PNG_ROWBYTES(pixel_bits, width) \ 2694 ((pixel_bits) >= 8 ? \ 2695 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2696 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2697 2698 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2699 ideal-delta..ideal+delta. Each argument is evaluated twice. 2700 "ideal" and "delta" should be constants, normally simple 2701 integers, "value" a variable. Added to libpng-1.2.6 JB */ 2702 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2703 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2704 2705 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2706 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2707 /* place to hold the signature string for a PNG file. */ 2708 #ifdef PNG_USE_GLOBAL_ARRAYS 2709 PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8]; 2710 #else 2711 #define png_sig png_sig_bytes(NULL) 2712 #endif 2713 #endif /* PNG_NO_EXTERN */ 2714 2715 /* Constant strings for known chunk types. If you need to add a chunk, 2716 * define the name here, and add an invocation of the macro in png.c and 2717 * wherever it's needed. 2718 */ 2719 #define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2720 #define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2721 #define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2722 #define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2723 #define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2724 #define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2725 #define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2726 #define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2727 #define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2728 #define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2729 #define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2730 #define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2731 #define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2732 #define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2733 #define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2734 #define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 2735 #define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 2736 #define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 2737 #define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 2738 #define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 2739 #define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 2740 2741 #ifdef PNG_USE_GLOBAL_ARRAYS 2742 PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5]; 2743 PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5]; 2744 PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5]; 2745 PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5]; 2746 PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5]; 2747 PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5]; 2748 PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5]; 2749 PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5]; 2750 PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5]; 2751 PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5]; 2752 PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5]; 2753 PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5]; 2754 PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5]; 2755 PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5]; 2756 PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5]; 2757 PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5]; 2758 PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5]; 2759 PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5]; 2760 PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5]; 2761 PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5]; 2762 PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5]; 2763 #endif /* PNG_USE_GLOBAL_ARRAYS */ 2764 2765 2766 /* Inline macros to do direct reads of bytes from the input buffer. These 2767 * require that you are using an architecture that uses PNG byte ordering 2768 * (MSB first) and supports unaligned data storage. I think that PowerPC 2769 * in big-endian mode and 680x0 are the only ones that will support this. 2770 * The x86 line of processors definitely do not. The png_get_int_32() 2771 * routine also assumes we are using two's complement format for negative 2772 * values, which is almost certainly true. 2773 */ 2774 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2775 # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) 2776 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2777 # endif 2778 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2779 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2780 #else 2781 # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) 2782 PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); 2783 # endif 2784 PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); 2785 PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); 2786 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2787 PNG_EXTERN png_uint_32 png_get_uint_31 PNGARG((png_structp png_ptr, 2788 png_bytep buf)); 2789 2790 /* Initialize png_ptr struct for reading, and allocate any other memory. 2791 * (old interface - DEPRECATED - use png_create_read_struct instead). 2792 */ 2793 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 2794 #undef png_read_init 2795 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 2796 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2797 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 2798 png_const_charp user_png_ver, png_size_t png_struct_size)); 2799 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 2800 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2801 png_info_size)); 2802 2803 /* Initialize png_ptr struct for writing, and allocate any other memory. 2804 * (old interface - DEPRECATED - use png_create_write_struct instead). 2805 */ 2806 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 2807 #undef png_write_init 2808 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 2809 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2810 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 2811 png_const_charp user_png_ver, png_size_t png_struct_size)); 2812 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 2813 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2814 png_info_size)); 2815 2816 /* Allocate memory for an internal libpng struct */ 2817 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 2818 2819 /* Free memory from internal libpng struct */ 2820 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 2821 2822 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 2823 malloc_fn, png_voidp mem_ptr)); 2824 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 2825 png_free_ptr free_fn, png_voidp mem_ptr)); 2826 2827 /* Free any memory that info_ptr points to and reset struct. */ 2828 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 2829 png_infop info_ptr)); 2830 2831 #ifndef PNG_1_0_X 2832 /* Function to allocate memory for zlib. */ 2833 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 2834 2835 /* Function to free memory for zlib */ 2836 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 2837 2838 #ifdef PNG_SIZE_T 2839 /* Function to convert a sizeof an item to png_sizeof item */ 2840 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 2841 #endif 2842 2843 /* Next four functions are used internally as callbacks. PNGAPI is required 2844 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ 2845 2846 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 2847 png_bytep data, png_size_t length)); 2848 2849 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2850 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 2851 png_bytep buffer, png_size_t length)); 2852 #endif 2853 2854 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 2855 png_bytep data, png_size_t length)); 2856 2857 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 2858 #if !defined(PNG_NO_STDIO) 2859 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 2860 #endif 2861 #endif 2862 #else /* PNG_1_0_X */ 2863 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2864 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 2865 png_bytep buffer, png_size_t length)); 2866 #endif 2867 #endif /* PNG_1_0_X */ 2868 2869 /* Reset the CRC variable */ 2870 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 2871 2872 /* Write the "data" buffer to whatever output you are using. */ 2873 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 2874 png_size_t length)); 2875 2876 /* Read data from whatever input you are using into the "data" buffer */ 2877 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 2878 png_size_t length)); 2879 2880 /* Read bytes into buf, and update png_ptr->crc */ 2881 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 2882 png_size_t length)); 2883 2884 /* Decompress data in a chunk that uses compression */ 2885 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 2886 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 2887 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, 2888 int comp_type, png_charp chunkdata, png_size_t chunklength, 2889 png_size_t prefix_length, png_size_t *data_length)); 2890 #endif 2891 2892 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 2893 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 2894 2895 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 2896 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 2897 2898 /* Calculate the CRC over a section of data. Note that we are only 2899 * passing a maximum of 64K on systems that have this as a memory limit, 2900 * since this is the maximum buffer size we can specify. 2901 */ 2902 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 2903 png_size_t length)); 2904 2905 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 2906 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 2907 #endif 2908 2909 2910 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2911 * The only currently known PNG chunks that use signed numbers are 2912 * the ancillary extension chunks, oFFs and pCAL. 2913 */ 2914 PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); 2915 2916 #if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) 2917 PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i)); 2918 #endif 2919 2920 /* Place a 16-bit number into a buffer in PNG byte order. 2921 * The parameter is declared unsigned int, not png_uint_16, 2922 * just to avoid potential problems on pre-ANSI C compilers. 2923 */ 2924 PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i)); 2925 2926 /* simple function to write the signature */ 2927 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 2928 2929 /* write various chunks */ 2930 2931 /* Write the IHDR chunk, and update the png_struct with the necessary 2932 * information. 2933 */ 2934 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 2935 png_uint_32 height, 2936 int bit_depth, int color_type, int compression_method, int filter_method, 2937 int interlace_method)); 2938 2939 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 2940 png_uint_32 num_pal)); 2941 2942 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 2943 png_size_t length)); 2944 2945 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 2946 2947 #if defined(PNG_WRITE_gAMA_SUPPORTED) 2948 #ifdef PNG_FLOATING_POINT_SUPPORTED 2949 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 2950 #endif 2951 #ifdef PNG_FIXED_POINT_SUPPORTED 2952 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 2953 file_gamma)); 2954 #endif 2955 #endif 2956 2957 #if defined(PNG_WRITE_sBIT_SUPPORTED) 2958 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 2959 int color_type)); 2960 #endif 2961 2962 #if defined(PNG_WRITE_cHRM_SUPPORTED) 2963 #ifdef PNG_FLOATING_POINT_SUPPORTED 2964 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 2965 double white_x, double white_y, 2966 double red_x, double red_y, double green_x, double green_y, 2967 double blue_x, double blue_y)); 2968 #endif 2969 #ifdef PNG_FIXED_POINT_SUPPORTED 2970 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 2971 png_fixed_point int_white_x, png_fixed_point int_white_y, 2972 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2973 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2974 png_fixed_point int_blue_y)); 2975 #endif 2976 #endif 2977 2978 #if defined(PNG_WRITE_sRGB_SUPPORTED) 2979 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 2980 int intent)); 2981 #endif 2982 2983 #if defined(PNG_WRITE_iCCP_SUPPORTED) 2984 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 2985 png_charp name, int compression_type, 2986 png_charp profile, int proflen)); 2987 /* Note to maintainer: profile should be png_bytep */ 2988 #endif 2989 2990 #if defined(PNG_WRITE_sPLT_SUPPORTED) 2991 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 2992 png_sPLT_tp palette)); 2993 #endif 2994 2995 #if defined(PNG_WRITE_tRNS_SUPPORTED) 2996 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 2997 png_color_16p values, int number, int color_type)); 2998 #endif 2999 3000 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3001 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3002 png_color_16p values, int color_type)); 3003 #endif 3004 3005 #if defined(PNG_WRITE_hIST_SUPPORTED) 3006 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3007 int num_hist)); 3008 #endif 3009 3010 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3011 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3012 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3013 png_charp key, png_charpp new_key)); 3014 #endif 3015 3016 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3017 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3018 png_charp text, png_size_t text_len)); 3019 #endif 3020 3021 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3022 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3023 png_charp text, png_size_t text_len, int compression)); 3024 #endif 3025 3026 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3027 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3028 int compression, png_charp key, png_charp lang, png_charp lang_key, 3029 png_charp text)); 3030 #endif 3031 3032 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3033 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3034 png_infop info_ptr, png_textp text_ptr, int num_text)); 3035 #endif 3036 3037 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3038 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3039 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 3040 #endif 3041 3042 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3043 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3044 png_int_32 X0, png_int_32 X1, int type, int nparams, 3045 png_charp units, png_charpp params)); 3046 #endif 3047 3048 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3049 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3050 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3051 int unit_type)); 3052 #endif 3053 3054 #if defined(PNG_WRITE_tIME_SUPPORTED) 3055 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3056 png_timep mod_time)); 3057 #endif 3058 3059 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3060 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3061 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3062 int unit, double width, double height)); 3063 #else 3064 #ifdef PNG_FIXED_POINT_SUPPORTED 3065 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3066 int unit, png_charp width, png_charp height)); 3067 #endif 3068 #endif 3069 #endif 3070 3071 /* Called when finished processing a row of data */ 3072 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3073 3074 /* Internal use only. Called before first row of data */ 3075 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3076 3077 #if defined(PNG_READ_GAMMA_SUPPORTED) 3078 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3079 #endif 3080 3081 /* combine a row of data, dealing with alpha, etc. if requested */ 3082 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3083 int mask)); 3084 3085 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3086 /* expand an interlaced row */ 3087 /* OLD pre-1.0.9 interface: 3088 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3089 png_bytep row, int pass, png_uint_32 transformations)); 3090 */ 3091 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3092 #endif 3093 3094 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3095 3096 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3097 /* grab pixels out of a row for an interlaced pass */ 3098 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3099 png_bytep row, int pass)); 3100 #endif 3101 3102 /* unfilter a row */ 3103 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3104 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 3105 3106 /* Choose the best filter to use and filter the row data */ 3107 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3108 png_row_infop row_info)); 3109 3110 /* Write out the filtered row. */ 3111 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3112 png_bytep filtered_row)); 3113 /* finish a row while reading, dealing with interlacing passes, etc. */ 3114 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3115 3116 /* initialize the row buffers, etc. */ 3117 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3118 /* optional call to update the users info structure */ 3119 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3120 png_infop info_ptr)); 3121 3122 /* these are the functions that do the transformations */ 3123 #if defined(PNG_READ_FILLER_SUPPORTED) 3124 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3125 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3126 #endif 3127 3128 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3129 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3130 png_bytep row)); 3131 #endif 3132 3133 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3134 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3135 png_bytep row)); 3136 #endif 3137 3138 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3139 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3140 png_bytep row)); 3141 #endif 3142 3143 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3144 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3145 png_bytep row)); 3146 #endif 3147 3148 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3149 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3150 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3151 png_bytep row, png_uint_32 flags)); 3152 #endif 3153 3154 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3155 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3156 #endif 3157 3158 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3159 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3160 #endif 3161 3162 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3163 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3164 row_info, png_bytep row)); 3165 #endif 3166 3167 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3168 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3169 png_bytep row)); 3170 #endif 3171 3172 #if defined(PNG_READ_PACK_SUPPORTED) 3173 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3174 #endif 3175 3176 #if defined(PNG_READ_SHIFT_SUPPORTED) 3177 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3178 png_color_8p sig_bits)); 3179 #endif 3180 3181 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3182 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3183 #endif 3184 3185 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3186 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3187 #endif 3188 3189 #if defined(PNG_READ_DITHER_SUPPORTED) 3190 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3191 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3192 3193 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3194 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3195 png_colorp palette, int num_palette)); 3196 # endif 3197 #endif 3198 3199 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3200 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3201 #endif 3202 3203 #if defined(PNG_WRITE_PACK_SUPPORTED) 3204 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3205 png_bytep row, png_uint_32 bit_depth)); 3206 #endif 3207 3208 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3209 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3210 png_color_8p bit_depth)); 3211 #endif 3212 3213 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3214 #if defined(PNG_READ_GAMMA_SUPPORTED) 3215 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3216 png_color_16p trans_values, png_color_16p background, 3217 png_color_16p background_1, 3218 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3219 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3220 png_uint_16pp gamma_16_to_1, int gamma_shift)); 3221 #else 3222 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3223 png_color_16p trans_values, png_color_16p background)); 3224 #endif 3225 #endif 3226 3227 #if defined(PNG_READ_GAMMA_SUPPORTED) 3228 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3229 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3230 int gamma_shift)); 3231 #endif 3232 3233 #if defined(PNG_READ_EXPAND_SUPPORTED) 3234 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3235 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 3236 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3237 png_bytep row, png_color_16p trans_value)); 3238 #endif 3239 3240 /* The following decodes the appropriate chunks, and does error correction, 3241 * then calls the appropriate callback for the chunk if it is valid. 3242 */ 3243 3244 /* decode the IHDR chunk */ 3245 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3246 png_uint_32 length)); 3247 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3248 png_uint_32 length)); 3249 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3250 png_uint_32 length)); 3251 3252 #if defined(PNG_READ_bKGD_SUPPORTED) 3253 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3254 png_uint_32 length)); 3255 #endif 3256 3257 #if defined(PNG_READ_cHRM_SUPPORTED) 3258 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3259 png_uint_32 length)); 3260 #endif 3261 3262 #if defined(PNG_READ_gAMA_SUPPORTED) 3263 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3264 png_uint_32 length)); 3265 #endif 3266 3267 #if defined(PNG_READ_hIST_SUPPORTED) 3268 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3269 png_uint_32 length)); 3270 #endif 3271 3272 #if defined(PNG_READ_iCCP_SUPPORTED) 3273 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3274 png_uint_32 length)); 3275 #endif /* PNG_READ_iCCP_SUPPORTED */ 3276 3277 #if defined(PNG_READ_iTXt_SUPPORTED) 3278 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3279 png_uint_32 length)); 3280 #endif 3281 3282 #if defined(PNG_READ_oFFs_SUPPORTED) 3283 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3284 png_uint_32 length)); 3285 #endif 3286 3287 #if defined(PNG_READ_pCAL_SUPPORTED) 3288 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3289 png_uint_32 length)); 3290 #endif 3291 3292 #if defined(PNG_READ_pHYs_SUPPORTED) 3293 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3294 png_uint_32 length)); 3295 #endif 3296 3297 #if defined(PNG_READ_sBIT_SUPPORTED) 3298 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3299 png_uint_32 length)); 3300 #endif 3301 3302 #if defined(PNG_READ_sCAL_SUPPORTED) 3303 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3304 png_uint_32 length)); 3305 #endif 3306 3307 #if defined(PNG_READ_sPLT_SUPPORTED) 3308 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3309 png_uint_32 length)); 3310 #endif /* PNG_READ_sPLT_SUPPORTED */ 3311 3312 #if defined(PNG_READ_sRGB_SUPPORTED) 3313 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3314 png_uint_32 length)); 3315 #endif 3316 3317 #if defined(PNG_READ_tEXt_SUPPORTED) 3318 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3319 png_uint_32 length)); 3320 #endif 3321 3322 #if defined(PNG_READ_tIME_SUPPORTED) 3323 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3324 png_uint_32 length)); 3325 #endif 3326 3327 #if defined(PNG_READ_tRNS_SUPPORTED) 3328 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3329 png_uint_32 length)); 3330 #endif 3331 3332 #if defined(PNG_READ_zTXt_SUPPORTED) 3333 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3334 png_uint_32 length)); 3335 #endif 3336 3337 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3338 png_infop info_ptr, png_uint_32 length)); 3339 3340 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3341 png_bytep chunk_name)); 3342 3343 /* handle the transformations for reading and writing */ 3344 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3345 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3346 3347 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3348 3349 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3350 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3351 png_infop info_ptr)); 3352 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3353 png_infop info_ptr)); 3354 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3355 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3356 png_uint_32 length)); 3357 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3358 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3359 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3360 png_bytep buffer, png_size_t buffer_length)); 3361 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3362 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3363 png_bytep buffer, png_size_t buffer_length)); 3364 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3365 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3366 png_infop info_ptr, png_uint_32 length)); 3367 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3368 png_infop info_ptr)); 3369 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3370 png_infop info_ptr)); 3371 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3372 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3373 png_infop info_ptr)); 3374 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3375 png_infop info_ptr)); 3376 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3377 #if defined(PNG_READ_tEXt_SUPPORTED) 3378 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3379 png_infop info_ptr, png_uint_32 length)); 3380 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3381 png_infop info_ptr)); 3382 #endif 3383 #if defined(PNG_READ_zTXt_SUPPORTED) 3384 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3385 png_infop info_ptr, png_uint_32 length)); 3386 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3387 png_infop info_ptr)); 3388 #endif 3389 #if defined(PNG_READ_iTXt_SUPPORTED) 3390 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3391 png_infop info_ptr, png_uint_32 length)); 3392 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3393 png_infop info_ptr)); 3394 #endif 3395 3396 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3397 3398 #ifdef PNG_MNG_FEATURES_SUPPORTED 3399 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3400 png_bytep row)); 3401 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3402 png_bytep row)); 3403 #endif 3404 3405 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3406 /* png.c */ /* PRIVATE */ 3407 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3408 #endif 3409 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3410 3411 #endif /* PNG_INTERNAL */ 3412 3413 #ifdef __cplusplus 3414 } 3415 #endif 3416 3417 #endif /* PNG_VERSION_INFO_ONLY */ 3418 /* do not put anything past this line */ 3419 #endif /* PNG_H */ 3420