1 2 /* png.h - header file for PNG reference library 3 * 4 * libpng version 1.2.19 - August 18, 2007 5 * Copyright (c) 1998-2007 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * Authors and maintainers: 10 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 11 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 12 * libpng versions 0.97, January 1998, through 1.2.19 - August 18, 2007: Glenn 13 * See also "Contributing Authors", below. 14 * 15 * Note about libpng version numbers: 16 * 17 * Due to various miscommunications, unforeseen code incompatibilities 18 * and occasional factors outside the authors' control, version numbering 19 * on the library has not always been consistent and straightforward. 20 * The following table summarizes matters since version 0.89c, which was 21 * the first widely used release: 22 * 23 * source png.h png.h shared-lib 24 * version string int version 25 * ------- ------ ----- ---------- 26 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 27 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 28 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 29 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 30 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 31 * 0.97c 0.97 97 2.0.97 32 * 0.98 0.98 98 2.0.98 33 * 0.99 0.99 98 2.0.99 34 * 0.99a-m 0.99 99 2.0.99 35 * 1.00 1.00 100 2.1.0 [100 should be 10000] 36 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 37 * 1.0.1 png.h string is 10001 2.1.0 38 * 1.0.1a-e identical to the 10002 from here on, the shared library 39 * 1.0.2 source version) 10002 is 2.V where V is the source code 40 * 1.0.2a-b 10003 version, except as noted. 41 * 1.0.3 10003 42 * 1.0.3a-d 10004 43 * 1.0.4 10004 44 * 1.0.4a-f 10005 45 * 1.0.5 (+ 2 patches) 10005 46 * 1.0.5a-d 10006 47 * 1.0.5e-r 10100 (not source compatible) 48 * 1.0.5s-v 10006 (not binary compatible) 49 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 50 * 1.0.6d-f 10007 (still binary incompatible) 51 * 1.0.6g 10007 52 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 53 * 1.0.6i 10007 10.6i 54 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 55 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 56 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 57 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 58 * 1.0.7 1 10007 (still compatible) 59 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 60 * 1.0.8rc1 1 10008 2.1.0.8rc1 61 * 1.0.8 1 10008 2.1.0.8 62 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 63 * 1.0.9rc1 1 10009 2.1.0.9rc1 64 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 65 * 1.0.9rc2 1 10009 2.1.0.9rc2 66 * 1.0.9 1 10009 2.1.0.9 67 * 1.0.10beta1 1 10010 2.1.0.10beta1 68 * 1.0.10rc1 1 10010 2.1.0.10rc1 69 * 1.0.10 1 10010 2.1.0.10 70 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 71 * 1.0.11rc1 1 10011 2.1.0.11rc1 72 * 1.0.11 1 10011 2.1.0.11 73 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 74 * 1.0.12rc1 2 10012 2.1.0.12rc1 75 * 1.0.12 2 10012 2.1.0.12 76 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 77 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 78 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 79 * 1.2.0rc1 3 10200 3.1.2.0rc1 80 * 1.2.0 3 10200 3.1.2.0 81 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 82 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 83 * 1.2.1 3 10201 3.1.2.1 84 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 85 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 86 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 87 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 88 * 1.0.13 10 10013 10.so.0.1.0.13 89 * 1.2.2 12 10202 12.so.0.1.2.2 90 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 91 * 1.2.3 12 10203 12.so.0.1.2.3 92 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 93 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 94 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 95 * 1.0.14 10 10014 10.so.0.1.0.14 96 * 1.2.4 13 10204 12.so.0.1.2.4 97 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 98 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 99 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 100 * 1.0.15 10 10015 10.so.0.1.0.15 101 * 1.2.5 13 10205 12.so.0.1.2.5 102 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 103 * 1.0.16 10 10016 10.so.0.1.0.16 104 * 1.2.6 13 10206 12.so.0.1.2.6 105 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 106 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 107 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 108 * 1.0.17 10 10017 10.so.0.1.0.17 109 * 1.2.7 13 10207 12.so.0.1.2.7 110 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 111 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 112 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 113 * 1.0.18 10 10018 10.so.0.1.0.18 114 * 1.2.8 13 10208 12.so.0.1.2.8 115 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 116 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 117 * 1.2.9rc1 13 10209 12.so.0.9[.0] 118 * 1.2.9 13 10209 12.so.0.9[.0] 119 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] 120 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] 121 * 1.2.10 13 10210 12.so.0.10[.0] 122 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 123 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] 124 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] 125 * 1.0.19 10 10019 10.so.0.19[.0] 126 * 1.2.11 13 10211 12.so.0.11[.0] 127 * 1.0.20 10 10020 10.so.0.20[.0] 128 * 1.2.12 13 10212 12.so.0.12[.0] 129 * 1.2.13beta1 13 10213 12.so.0.13[.0] 130 * 1.0.21 10 10021 10.so.0.21[.0] 131 * 1.2.13 13 10213 12.so.0.13[.0] 132 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] 133 * 1.0.22rc1 10 10022 10.so.0.22[.0] 134 * 1.2.14rc1 13 10214 12.so.0.14[.0] 135 * 1.0.22 10 10022 10.so.0.22[.0] 136 * 1.2.14 13 10214 12.so.0.14[.0] 137 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] 138 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] 139 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] 140 * 1.0.23 10 10023 10.so.0.23[.0] 141 * 1.2.15 13 10215 12.so.0.15[.0] 142 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] 143 * 1.2.16rc1 13 10216 12.so.0.16[.0] 144 * 1.0.24 10 10024 10.so.0.24[.0] 145 * 1.2.16 13 10216 12.so.0.16[.0] 146 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] 147 * 1.0.25rc1 10 10025 10.so.0.25[.0] 148 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] 149 * 1.0.25 10 10025 10.so.0.25[.0] 150 * 1.2.17 13 10217 12.so.0.17[.0] 151 * 1.0.26 10 10026 10.so.0.26[.0] 152 * 1.2.18 13 10218 12.so.0.18[.0] 153 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] 154 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] 155 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] 156 * 1.0.27 10 10027 10.so.0.27[.0] 157 * 1.2.19 13 10219 12.so.0.19[.0] 158 * 159 * Henceforth the source version will match the shared-library major 160 * and minor numbers; the shared-library major version number will be 161 * used for changes in backward compatibility, as it is intended. The 162 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 163 * for applications, is an unsigned integer of the form xyyzz corresponding 164 * to the source version x.y.z (leading zeros in y and z). Beta versions 165 * were given the previous public release number plus a letter, until 166 * version 1.0.6j; from then on they were given the upcoming public 167 * release number plus "betaNN" or "rcN". 168 * 169 * Binary incompatibility exists only when applications make direct access 170 * to the info_ptr or png_ptr members through png.h, and the compiled 171 * application is loaded with a different version of the library. 172 * 173 * DLLNUM will change each time there are forward or backward changes 174 * in binary compatibility (e.g., when a new feature is added). 175 * 176 * See libpng.txt or libpng.3 for more information. The PNG specification 177 * is available as a W3C Recommendation and as an ISO Specification, 178 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 179 */ 180 181 /* 182 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 183 * 184 * If you modify libpng you may insert additional notices immediately following 185 * this sentence. 186 * 187 * libpng versions 1.2.6, August 15, 2004, through 1.2.19, August 18, 2007, are 188 * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are 189 * distributed according to the same disclaimer and license as libpng-1.2.5 190 * with the following individual added to the list of Contributing Authors: 191 * 192 * Cosmin Truta 193 * 194 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 195 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 196 * distributed according to the same disclaimer and license as libpng-1.0.6 197 * with the following individuals added to the list of Contributing Authors: 198 * 199 * Simon-Pierre Cadieux 200 * Eric S. Raymond 201 * Gilles Vollant 202 * 203 * and with the following additions to the disclaimer: 204 * 205 * There is no warranty against interference with your enjoyment of the 206 * library or against infringement. There is no warranty that our 207 * efforts or the library will fulfill any of your particular purposes 208 * or needs. This library is provided with all faults, and the entire 209 * risk of satisfactory quality, performance, accuracy, and effort is with 210 * the user. 211 * 212 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 213 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 214 * distributed according to the same disclaimer and license as libpng-0.96, 215 * with the following individuals added to the list of Contributing Authors: 216 * 217 * Tom Lane 218 * Glenn Randers-Pehrson 219 * Willem van Schaik 220 * 221 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 222 * Copyright (c) 1996, 1997 Andreas Dilger 223 * Distributed according to the same disclaimer and license as libpng-0.88, 224 * with the following individuals added to the list of Contributing Authors: 225 * 226 * John Bowler 227 * Kevin Bracey 228 * Sam Bushell 229 * Magnus Holmgren 230 * Greg Roelofs 231 * Tom Tanner 232 * 233 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 234 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 235 * 236 * For the purposes of this copyright and license, "Contributing Authors" 237 * is defined as the following set of individuals: 238 * 239 * Andreas Dilger 240 * Dave Martindale 241 * Guy Eric Schalnat 242 * Paul Schmidt 243 * Tim Wegner 244 * 245 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 246 * and Group 42, Inc. disclaim all warranties, expressed or implied, 247 * including, without limitation, the warranties of merchantability and of 248 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 249 * assume no liability for direct, indirect, incidental, special, exemplary, 250 * or consequential damages, which may result from the use of the PNG 251 * Reference Library, even if advised of the possibility of such damage. 252 * 253 * Permission is hereby granted to use, copy, modify, and distribute this 254 * source code, or portions hereof, for any purpose, without fee, subject 255 * to the following restrictions: 256 * 257 * 1. The origin of this source code must not be misrepresented. 258 * 259 * 2. Altered versions must be plainly marked as such and 260 * must not be misrepresented as being the original source. 261 * 262 * 3. This Copyright notice may not be removed or altered from 263 * any source or altered source distribution. 264 * 265 * The Contributing Authors and Group 42, Inc. specifically permit, without 266 * fee, and encourage the use of this source code as a component to 267 * supporting the PNG file format in commercial products. If you use this 268 * source code in a product, acknowledgment is not required but would be 269 * appreciated. 270 */ 271 272 /* 273 * A "png_get_copyright" function is available, for convenient use in "about" 274 * boxes and the like: 275 * 276 * printf("%s",png_get_copyright(NULL)); 277 * 278 * Also, the PNG logo (in PNG format, of course) is supplied in the 279 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 280 */ 281 282 /* 283 * Libpng is OSI Certified Open Source Software. OSI Certified is a 284 * certification mark of the Open Source Initiative. 285 */ 286 287 /* 288 * The contributing authors would like to thank all those who helped 289 * with testing, bug fixes, and patience. This wouldn't have been 290 * possible without all of you. 291 * 292 * Thanks to Frank J. T. Wojcik for helping with the documentation. 293 */ 294 295 /* 296 * Y2K compliance in libpng: 297 * ========================= 298 * 299 * August 18, 2007 300 * 301 * Since the PNG Development group is an ad-hoc body, we can't make 302 * an official declaration. 303 * 304 * This is your unofficial assurance that libpng from version 0.71 and 305 * upward through 1.2.19 are Y2K compliant. It is my belief that earlier 306 * versions were also Y2K compliant. 307 * 308 * Libpng only has three year fields. One is a 2-byte unsigned integer 309 * that will hold years up to 65535. The other two hold the date in text 310 * format, and will hold years up to 9999. 311 * 312 * The integer is 313 * "png_uint_16 year" in png_time_struct. 314 * 315 * The strings are 316 * "png_charp time_buffer" in png_struct and 317 * "near_time_buffer", which is a local character string in png.c. 318 * 319 * There are seven time-related functions: 320 * png.c: png_convert_to_rfc_1123() in png.c 321 * (formerly png_convert_to_rfc_1152() in error) 322 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 323 * png_convert_from_time_t() in pngwrite.c 324 * png_get_tIME() in pngget.c 325 * png_handle_tIME() in pngrutil.c, called in pngread.c 326 * png_set_tIME() in pngset.c 327 * png_write_tIME() in pngwutil.c, called in pngwrite.c 328 * 329 * All handle dates properly in a Y2K environment. The 330 * png_convert_from_time_t() function calls gmtime() to convert from system 331 * clock time, which returns (year - 1900), which we properly convert to 332 * the full 4-digit year. There is a possibility that applications using 333 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 334 * function, or that they are incorrectly passing only a 2-digit year 335 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 336 * but this is not under our control. The libpng documentation has always 337 * stated that it works with 4-digit years, and the APIs have been 338 * documented as such. 339 * 340 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 341 * integer to hold the year, and can hold years as large as 65535. 342 * 343 * zlib, upon which libpng depends, is also Y2K compliant. It contains 344 * no date-related code. 345 * 346 * Glenn Randers-Pehrson 347 * libpng maintainer 348 * PNG Development Group 349 */ 350 351 #ifndef PNG_H 352 #define PNG_H 353 354 /* This is not the place to learn how to use libpng. The file libpng.txt 355 * describes how to use libpng, and the file example.c summarizes it 356 * with some code on which to build. This file is useful for looking 357 * at the actual function definitions and structure components. 358 */ 359 360 /* Version information for png.h - this should match the version in png.c */ 361 #define PNG_LIBPNG_VER_STRING "1.2.19" 362 #define PNG_HEADER_VERSION_STRING \ 363 " libpng version 1.2.19 - August 18, 2007\n" 364 365 #define PNG_LIBPNG_VER_SONUM 0 366 #define PNG_LIBPNG_VER_DLLNUM 13 367 368 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 369 #define PNG_LIBPNG_VER_MAJOR 1 370 #define PNG_LIBPNG_VER_MINOR 2 371 #define PNG_LIBPNG_VER_RELEASE 19 372 /* This should match the numeric part of the final component of 373 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ 374 375 #define PNG_LIBPNG_VER_BUILD 0 376 377 /* Release Status */ 378 #define PNG_LIBPNG_BUILD_ALPHA 1 379 #define PNG_LIBPNG_BUILD_BETA 2 380 #define PNG_LIBPNG_BUILD_RC 3 381 #define PNG_LIBPNG_BUILD_STABLE 4 382 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 383 384 /* Release-Specific Flags */ 385 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 386 PNG_LIBPNG_BUILD_STABLE only */ 387 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 388 PNG_LIBPNG_BUILD_SPECIAL */ 389 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 390 PNG_LIBPNG_BUILD_PRIVATE */ 391 392 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 393 394 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 395 * We must not include leading zeros. 396 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 397 * version 1.0.0 was mis-numbered 100 instead of 10000). From 398 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ 399 #define PNG_LIBPNG_VER 10219 /* 1.2.19 */ 400 401 #ifndef PNG_VERSION_INFO_ONLY 402 /* include the compression library's header */ 403 #include "zlib.h" 404 #endif 405 406 /* include all user configurable info, including optional assembler routines */ 407 #include "pngconf.h" 408 409 /* 410 * Added at libpng-1.2.8 */ 411 /* Ref MSDN: Private as priority over Special 412 * VS_FF_PRIVATEBUILD File *was not* built using standard release 413 * procedures. If this value is given, the StringFileInfo block must 414 * contain a PrivateBuild string. 415 * 416 * VS_FF_SPECIALBUILD File *was* built by the original company using 417 * standard release procedures but is a variation of the standard 418 * file of the same version number. If this value is given, the 419 * StringFileInfo block must contain a SpecialBuild string. 420 */ 421 422 #if defined(PNG_USER_PRIVATEBUILD) 423 # define PNG_LIBPNG_BUILD_TYPE \ 424 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 425 #else 426 # if defined(PNG_LIBPNG_SPECIALBUILD) 427 # define PNG_LIBPNG_BUILD_TYPE \ 428 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 429 # else 430 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 431 # endif 432 #endif 433 434 #ifndef PNG_VERSION_INFO_ONLY 435 436 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 437 #ifdef __cplusplus 438 extern "C" { 439 #endif /* __cplusplus */ 440 441 /* This file is arranged in several sections. The first section contains 442 * structure and type definitions. The second section contains the external 443 * library functions, while the third has the internal library functions, 444 * which applications aren't expected to use directly. 445 */ 446 447 #ifndef PNG_NO_TYPECAST_NULL 448 #define int_p_NULL (int *)NULL 449 #define png_bytep_NULL (png_bytep)NULL 450 #define png_bytepp_NULL (png_bytepp)NULL 451 #define png_doublep_NULL (png_doublep)NULL 452 #define png_error_ptr_NULL (png_error_ptr)NULL 453 #define png_flush_ptr_NULL (png_flush_ptr)NULL 454 #define png_free_ptr_NULL (png_free_ptr)NULL 455 #define png_infopp_NULL (png_infopp)NULL 456 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 457 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 458 #define png_rw_ptr_NULL (png_rw_ptr)NULL 459 #define png_structp_NULL (png_structp)NULL 460 #define png_uint_16p_NULL (png_uint_16p)NULL 461 #define png_voidp_NULL (png_voidp)NULL 462 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 463 #else 464 #define int_p_NULL NULL 465 #define png_bytep_NULL NULL 466 #define png_bytepp_NULL NULL 467 #define png_doublep_NULL NULL 468 #define png_error_ptr_NULL NULL 469 #define png_flush_ptr_NULL NULL 470 #define png_free_ptr_NULL NULL 471 #define png_infopp_NULL NULL 472 #define png_malloc_ptr_NULL NULL 473 #define png_read_status_ptr_NULL NULL 474 #define png_rw_ptr_NULL NULL 475 #define png_structp_NULL NULL 476 #define png_uint_16p_NULL NULL 477 #define png_voidp_NULL NULL 478 #define png_write_status_ptr_NULL NULL 479 #endif 480 481 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 482 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 483 /* Version information for C files, stored in png.c. This had better match 484 * the version above. 485 */ 486 #ifdef PNG_USE_GLOBAL_ARRAYS 487 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 488 /* need room for 99.99.99beta99z */ 489 #else 490 #define png_libpng_ver png_get_header_ver(NULL) 491 #endif 492 493 #ifdef PNG_USE_GLOBAL_ARRAYS 494 /* This was removed in version 1.0.5c */ 495 /* Structures to facilitate easy interlacing. See png.c for more details */ 496 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 497 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 498 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 499 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 500 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 501 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 502 #if defined(PNG_HAVE_MMX_COMBINE_ROW) || defined(PNG_OPTIMIZED_CODE_SUPPORTED) 503 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_width[7]; 504 #endif 505 /* This isn't currently used. If you need it, see png.c for more details. 506 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 507 */ 508 #endif 509 510 #endif /* PNG_NO_EXTERN */ 511 512 /* Three color definitions. The order of the red, green, and blue, (and the 513 * exact size) is not important, although the size of the fields need to 514 * be png_byte or png_uint_16 (as defined below). 515 */ 516 typedef struct png_color_struct 517 { 518 png_byte red; 519 png_byte green; 520 png_byte blue; 521 } png_color; 522 typedef png_color FAR * png_colorp; 523 typedef png_color FAR * FAR * png_colorpp; 524 525 typedef struct png_color_16_struct 526 { 527 png_byte index; /* used for palette files */ 528 png_uint_16 red; /* for use in red green blue files */ 529 png_uint_16 green; 530 png_uint_16 blue; 531 png_uint_16 gray; /* for use in grayscale files */ 532 } png_color_16; 533 typedef png_color_16 FAR * png_color_16p; 534 typedef png_color_16 FAR * FAR * png_color_16pp; 535 536 typedef struct png_color_8_struct 537 { 538 png_byte red; /* for use in red green blue files */ 539 png_byte green; 540 png_byte blue; 541 png_byte gray; /* for use in grayscale files */ 542 png_byte alpha; /* for alpha channel files */ 543 } png_color_8; 544 typedef png_color_8 FAR * png_color_8p; 545 typedef png_color_8 FAR * FAR * png_color_8pp; 546 547 /* 548 * The following two structures are used for the in-core representation 549 * of sPLT chunks. 550 */ 551 typedef struct png_sPLT_entry_struct 552 { 553 png_uint_16 red; 554 png_uint_16 green; 555 png_uint_16 blue; 556 png_uint_16 alpha; 557 png_uint_16 frequency; 558 } png_sPLT_entry; 559 typedef png_sPLT_entry FAR * png_sPLT_entryp; 560 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 561 562 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 563 * occupy the LSB of their respective members, and the MSB of each member 564 * is zero-filled. The frequency member always occupies the full 16 bits. 565 */ 566 567 typedef struct png_sPLT_struct 568 { 569 png_charp name; /* palette name */ 570 png_byte depth; /* depth of palette samples */ 571 png_sPLT_entryp entries; /* palette entries */ 572 png_int_32 nentries; /* number of palette entries */ 573 } png_sPLT_t; 574 typedef png_sPLT_t FAR * png_sPLT_tp; 575 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 576 577 #ifdef PNG_TEXT_SUPPORTED 578 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 579 * and whether that contents is compressed or not. The "key" field 580 * points to a regular zero-terminated C string. The "text", "lang", and 581 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 582 * However, the * structure returned by png_get_text() will always contain 583 * regular zero-terminated C strings (possibly empty), never NULL pointers, 584 * so they can be safely used in printf() and other string-handling functions. 585 */ 586 typedef struct png_text_struct 587 { 588 int compression; /* compression value: 589 -1: tEXt, none 590 0: zTXt, deflate 591 1: iTXt, none 592 2: iTXt, deflate */ 593 png_charp key; /* keyword, 1-79 character description of "text" */ 594 png_charp text; /* comment, may be an empty string (ie "") 595 or a NULL pointer */ 596 png_size_t text_length; /* length of the text string */ 597 #ifdef PNG_iTXt_SUPPORTED 598 png_size_t itxt_length; /* length of the itxt string */ 599 png_charp lang; /* language code, 0-79 characters 600 or a NULL pointer */ 601 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 602 chars or a NULL pointer */ 603 #endif 604 } png_text; 605 typedef png_text FAR * png_textp; 606 typedef png_text FAR * FAR * png_textpp; 607 #endif 608 609 /* Supported compression types for text in PNG files (tEXt, and zTXt). 610 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 611 #define PNG_TEXT_COMPRESSION_NONE_WR -3 612 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 613 #define PNG_TEXT_COMPRESSION_NONE -1 614 #define PNG_TEXT_COMPRESSION_zTXt 0 615 #define PNG_ITXT_COMPRESSION_NONE 1 616 #define PNG_ITXT_COMPRESSION_zTXt 2 617 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 618 619 /* png_time is a way to hold the time in an machine independent way. 620 * Two conversions are provided, both from time_t and struct tm. There 621 * is no portable way to convert to either of these structures, as far 622 * as I know. If you know of a portable way, send it to me. As a side 623 * note - PNG has always been Year 2000 compliant! 624 */ 625 typedef struct png_time_struct 626 { 627 png_uint_16 year; /* full year, as in, 1995 */ 628 png_byte month; /* month of year, 1 - 12 */ 629 png_byte day; /* day of month, 1 - 31 */ 630 png_byte hour; /* hour of day, 0 - 23 */ 631 png_byte minute; /* minute of hour, 0 - 59 */ 632 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 633 } png_time; 634 typedef png_time FAR * png_timep; 635 typedef png_time FAR * FAR * png_timepp; 636 637 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 638 /* png_unknown_chunk is a structure to hold queued chunks for which there is 639 * no specific support. The idea is that we can use this to queue 640 * up private chunks for output even though the library doesn't actually 641 * know about their semantics. 642 */ 643 typedef struct png_unknown_chunk_t 644 { 645 png_byte name[5]; 646 png_byte *data; 647 png_size_t size; 648 649 /* libpng-using applications should NOT directly modify this byte. */ 650 png_byte location; /* mode of operation at read time */ 651 } 652 png_unknown_chunk; 653 typedef png_unknown_chunk FAR * png_unknown_chunkp; 654 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 655 #endif 656 657 /* png_info is a structure that holds the information in a PNG file so 658 * that the application can find out the characteristics of the image. 659 * If you are reading the file, this structure will tell you what is 660 * in the PNG file. If you are writing the file, fill in the information 661 * you want to put into the PNG file, then call png_write_info(). 662 * The names chosen should be very close to the PNG specification, so 663 * consult that document for information about the meaning of each field. 664 * 665 * With libpng < 0.95, it was only possible to directly set and read the 666 * the values in the png_info_struct, which meant that the contents and 667 * order of the values had to remain fixed. With libpng 0.95 and later, 668 * however, there are now functions that abstract the contents of 669 * png_info_struct from the application, so this makes it easier to use 670 * libpng with dynamic libraries, and even makes it possible to use 671 * libraries that don't have all of the libpng ancillary chunk-handing 672 * functionality. 673 * 674 * In any case, the order of the parameters in png_info_struct should NOT 675 * be changed for as long as possible to keep compatibility with applications 676 * that use the old direct-access method with png_info_struct. 677 * 678 * The following members may have allocated storage attached that should be 679 * cleaned up before the structure is discarded: palette, trans, text, 680 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 681 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 682 * are automatically freed when the info structure is deallocated, if they were 683 * allocated internally by libpng. This behavior can be changed by means 684 * of the png_data_freer() function. 685 * 686 * More allocation details: all the chunk-reading functions that 687 * change these members go through the corresponding png_set_* 688 * functions. A function to clear these members is available: see 689 * png_free_data(). The png_set_* functions do not depend on being 690 * able to point info structure members to any of the storage they are 691 * passed (they make their own copies), EXCEPT that the png_set_text 692 * functions use the same storage passed to them in the text_ptr or 693 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 694 * functions do not make their own copies. 695 */ 696 typedef struct png_info_struct 697 { 698 /* the following are necessary for every PNG file */ 699 png_uint_32 width; /* width of image in pixels (from IHDR) */ 700 png_uint_32 height; /* height of image in pixels (from IHDR) */ 701 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 702 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 703 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 704 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 705 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 706 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 707 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 708 /* The following three should have been named *_method not *_type */ 709 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 710 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 711 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 712 713 /* The following is informational only on read, and not used on writes. */ 714 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 715 png_byte pixel_depth; /* number of bits per pixel */ 716 png_byte spare_byte; /* to align the data, and for future use */ 717 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 718 719 /* The rest of the data is optional. If you are reading, check the 720 * valid field to see if the information in these are valid. If you 721 * are writing, set the valid field to those chunks you want written, 722 * and initialize the appropriate fields below. 723 */ 724 725 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 726 /* The gAMA chunk describes the gamma characteristics of the system 727 * on which the image was created, normally in the range [1.0, 2.5]. 728 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 729 */ 730 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 731 #endif 732 733 #if defined(PNG_sRGB_SUPPORTED) 734 /* GR-P, 0.96a */ 735 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 736 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 737 #endif 738 739 #if defined(PNG_TEXT_SUPPORTED) 740 /* The tEXt, and zTXt chunks contain human-readable textual data in 741 * uncompressed, compressed, and optionally compressed forms, respectively. 742 * The data in "text" is an array of pointers to uncompressed, 743 * null-terminated C strings. Each chunk has a keyword that describes the 744 * textual data contained in that chunk. Keywords are not required to be 745 * unique, and the text string may be empty. Any number of text chunks may 746 * be in an image. 747 */ 748 int num_text; /* number of comments read/to write */ 749 int max_text; /* current size of text array */ 750 png_textp text; /* array of comments read/to write */ 751 #endif /* PNG_TEXT_SUPPORTED */ 752 753 #if defined(PNG_tIME_SUPPORTED) 754 /* The tIME chunk holds the last time the displayed image data was 755 * modified. See the png_time struct for the contents of this struct. 756 */ 757 png_time mod_time; 758 #endif 759 760 #if defined(PNG_sBIT_SUPPORTED) 761 /* The sBIT chunk specifies the number of significant high-order bits 762 * in the pixel data. Values are in the range [1, bit_depth], and are 763 * only specified for the channels in the pixel data. The contents of 764 * the low-order bits is not specified. Data is valid if 765 * (valid & PNG_INFO_sBIT) is non-zero. 766 */ 767 png_color_8 sig_bit; /* significant bits in color channels */ 768 #endif 769 770 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 771 defined(PNG_READ_BACKGROUND_SUPPORTED) 772 /* The tRNS chunk supplies transparency data for paletted images and 773 * other image types that don't need a full alpha channel. There are 774 * "num_trans" transparency values for a paletted image, stored in the 775 * same order as the palette colors, starting from index 0. Values 776 * for the data are in the range [0, 255], ranging from fully transparent 777 * to fully opaque, respectively. For non-paletted images, there is a 778 * single color specified that should be treated as fully transparent. 779 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 780 */ 781 png_bytep trans; /* transparent values for paletted image */ 782 png_color_16 trans_values; /* transparent color for non-palette image */ 783 #endif 784 785 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 786 /* The bKGD chunk gives the suggested image background color if the 787 * display program does not have its own background color and the image 788 * is needs to composited onto a background before display. The colors 789 * in "background" are normally in the same color space/depth as the 790 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 791 */ 792 png_color_16 background; 793 #endif 794 795 #if defined(PNG_oFFs_SUPPORTED) 796 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 797 * and downwards from the top-left corner of the display, page, or other 798 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 799 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 800 */ 801 png_int_32 x_offset; /* x offset on page */ 802 png_int_32 y_offset; /* y offset on page */ 803 png_byte offset_unit_type; /* offset units type */ 804 #endif 805 806 #if defined(PNG_pHYs_SUPPORTED) 807 /* The pHYs chunk gives the physical pixel density of the image for 808 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 809 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 810 */ 811 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 812 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 813 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 814 #endif 815 816 #if defined(PNG_hIST_SUPPORTED) 817 /* The hIST chunk contains the relative frequency or importance of the 818 * various palette entries, so that a viewer can intelligently select a 819 * reduced-color palette, if required. Data is an array of "num_palette" 820 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 821 * is non-zero. 822 */ 823 png_uint_16p hist; 824 #endif 825 826 #ifdef PNG_cHRM_SUPPORTED 827 /* The cHRM chunk describes the CIE color characteristics of the monitor 828 * on which the PNG was created. This data allows the viewer to do gamut 829 * mapping of the input image to ensure that the viewer sees the same 830 * colors in the image as the creator. Values are in the range 831 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 832 */ 833 #ifdef PNG_FLOATING_POINT_SUPPORTED 834 float x_white; 835 float y_white; 836 float x_red; 837 float y_red; 838 float x_green; 839 float y_green; 840 float x_blue; 841 float y_blue; 842 #endif 843 #endif 844 845 #if defined(PNG_pCAL_SUPPORTED) 846 /* The pCAL chunk describes a transformation between the stored pixel 847 * values and original physical data values used to create the image. 848 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 849 * range given by [pcal_X0, pcal_X1], and are further transformed by a 850 * (possibly non-linear) transformation function given by "pcal_type" 851 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 852 * defines below, and the PNG-Group's PNG extensions document for a 853 * complete description of the transformations and how they should be 854 * implemented, and for a description of the ASCII parameter strings. 855 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 856 */ 857 png_charp pcal_purpose; /* pCAL chunk description string */ 858 png_int_32 pcal_X0; /* minimum value */ 859 png_int_32 pcal_X1; /* maximum value */ 860 png_charp pcal_units; /* Latin-1 string giving physical units */ 861 png_charpp pcal_params; /* ASCII strings containing parameter values */ 862 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 863 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 864 #endif 865 866 /* New members added in libpng-1.0.6 */ 867 #ifdef PNG_FREE_ME_SUPPORTED 868 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 869 #endif 870 871 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 872 /* storage for unknown chunks that the library doesn't recognize. */ 873 png_unknown_chunkp unknown_chunks; 874 png_size_t unknown_chunks_num; 875 #endif 876 877 #if defined(PNG_iCCP_SUPPORTED) 878 /* iCCP chunk data. */ 879 png_charp iccp_name; /* profile name */ 880 png_charp iccp_profile; /* International Color Consortium profile data */ 881 /* Note to maintainer: should be png_bytep */ 882 png_uint_32 iccp_proflen; /* ICC profile data length */ 883 png_byte iccp_compression; /* Always zero */ 884 #endif 885 886 #if defined(PNG_sPLT_SUPPORTED) 887 /* data on sPLT chunks (there may be more than one). */ 888 png_sPLT_tp splt_palettes; 889 png_uint_32 splt_palettes_num; 890 #endif 891 892 #if defined(PNG_sCAL_SUPPORTED) 893 /* The sCAL chunk describes the actual physical dimensions of the 894 * subject matter of the graphic. The chunk contains a unit specification 895 * a byte value, and two ASCII strings representing floating-point 896 * values. The values are width and height corresponsing to one pixel 897 * in the image. This external representation is converted to double 898 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 899 */ 900 png_byte scal_unit; /* unit of physical scale */ 901 #ifdef PNG_FLOATING_POINT_SUPPORTED 902 double scal_pixel_width; /* width of one pixel */ 903 double scal_pixel_height; /* height of one pixel */ 904 #endif 905 #ifdef PNG_FIXED_POINT_SUPPORTED 906 png_charp scal_s_width; /* string containing height */ 907 png_charp scal_s_height; /* string containing width */ 908 #endif 909 #endif 910 911 #if defined(PNG_INFO_IMAGE_SUPPORTED) 912 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 913 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 914 png_bytepp row_pointers; /* the image bits */ 915 #endif 916 917 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 918 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 919 #endif 920 921 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 922 png_fixed_point int_x_white; 923 png_fixed_point int_y_white; 924 png_fixed_point int_x_red; 925 png_fixed_point int_y_red; 926 png_fixed_point int_x_green; 927 png_fixed_point int_y_green; 928 png_fixed_point int_x_blue; 929 png_fixed_point int_y_blue; 930 #endif 931 932 } png_info; 933 934 typedef png_info FAR * png_infop; 935 typedef png_info FAR * FAR * png_infopp; 936 937 /* Maximum positive integer used in PNG is (2^31)-1 */ 938 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 939 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 940 #define PNG_SIZE_MAX ((png_size_t)(-1)) 941 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 942 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 943 #define PNG_MAX_UINT PNG_UINT_31_MAX 944 #endif 945 946 /* These describe the color_type field in png_info. */ 947 /* color type masks */ 948 #define PNG_COLOR_MASK_PALETTE 1 949 #define PNG_COLOR_MASK_COLOR 2 950 #define PNG_COLOR_MASK_ALPHA 4 951 952 /* color types. Note that not all combinations are legal */ 953 #define PNG_COLOR_TYPE_GRAY 0 954 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 955 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 956 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 957 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 958 /* aliases */ 959 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 960 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 961 962 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 963 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 964 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 965 966 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 967 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 968 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 969 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 970 971 /* These are for the interlacing type. These values should NOT be changed. */ 972 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 973 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 974 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 975 976 /* These are for the oFFs chunk. These values should NOT be changed. */ 977 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 978 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 979 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 980 981 /* These are for the pCAL chunk. These values should NOT be changed. */ 982 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 983 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 984 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 985 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 986 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 987 988 /* These are for the sCAL chunk. These values should NOT be changed. */ 989 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 990 #define PNG_SCALE_METER 1 /* meters per pixel */ 991 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 992 #define PNG_SCALE_LAST 3 /* Not a valid value */ 993 994 /* These are for the pHYs chunk. These values should NOT be changed. */ 995 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 996 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 997 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 998 999 /* These are for the sRGB chunk. These values should NOT be changed. */ 1000 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1001 #define PNG_sRGB_INTENT_RELATIVE 1 1002 #define PNG_sRGB_INTENT_SATURATION 2 1003 #define PNG_sRGB_INTENT_ABSOLUTE 3 1004 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1005 1006 /* This is for text chunks */ 1007 #define PNG_KEYWORD_MAX_LENGTH 79 1008 1009 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1010 #define PNG_MAX_PALETTE_LENGTH 256 1011 1012 /* These determine if an ancillary chunk's data has been successfully read 1013 * from the PNG header, or if the application has filled in the corresponding 1014 * data in the info_struct to be written into the output file. The values 1015 * of the PNG_INFO_<chunk> defines should NOT be changed. 1016 */ 1017 #define PNG_INFO_gAMA 0x0001 1018 #define PNG_INFO_sBIT 0x0002 1019 #define PNG_INFO_cHRM 0x0004 1020 #define PNG_INFO_PLTE 0x0008 1021 #define PNG_INFO_tRNS 0x0010 1022 #define PNG_INFO_bKGD 0x0020 1023 #define PNG_INFO_hIST 0x0040 1024 #define PNG_INFO_pHYs 0x0080 1025 #define PNG_INFO_oFFs 0x0100 1026 #define PNG_INFO_tIME 0x0200 1027 #define PNG_INFO_pCAL 0x0400 1028 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1029 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1030 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1031 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1032 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1033 1034 /* This is used for the transformation routines, as some of them 1035 * change these values for the row. It also should enable using 1036 * the routines for other purposes. 1037 */ 1038 typedef struct png_row_info_struct 1039 { 1040 png_uint_32 width; /* width of row */ 1041 png_uint_32 rowbytes; /* number of bytes in row */ 1042 png_byte color_type; /* color type of row */ 1043 png_byte bit_depth; /* bit depth of row */ 1044 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1045 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1046 } png_row_info; 1047 1048 typedef png_row_info FAR * png_row_infop; 1049 typedef png_row_info FAR * FAR * png_row_infopp; 1050 1051 /* These are the function types for the I/O functions and for the functions 1052 * that allow the user to override the default I/O functions with his or her 1053 * own. The png_error_ptr type should match that of user-supplied warning 1054 * and error functions, while the png_rw_ptr type should match that of the 1055 * user read/write data functions. 1056 */ 1057 typedef struct png_struct_def png_struct; 1058 typedef png_struct FAR * png_structp; 1059 1060 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1061 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1062 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1063 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1064 int)); 1065 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1066 int)); 1067 1068 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1069 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1070 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1071 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1072 png_uint_32, int)); 1073 #endif 1074 1075 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1076 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1077 defined(PNG_LEGACY_SUPPORTED) 1078 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1079 png_row_infop, png_bytep)); 1080 #endif 1081 1082 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1083 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1084 #endif 1085 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1086 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1087 #endif 1088 1089 /* Transform masks for the high-level interface */ 1090 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1091 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1092 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1093 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1094 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1095 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1096 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1097 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1098 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1099 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1100 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1101 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1102 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ 1103 1104 /* Flags for MNG supported features */ 1105 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1106 #define PNG_FLAG_MNG_FILTER_64 0x04 1107 #define PNG_ALL_MNG_FEATURES 0x05 1108 1109 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1110 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1111 1112 /* The structure that holds the information to read and write PNG files. 1113 * The only people who need to care about what is inside of this are the 1114 * people who will be modifying the library for their own special needs. 1115 * It should NOT be accessed directly by an application, except to store 1116 * the jmp_buf. 1117 */ 1118 1119 struct png_struct_def 1120 { 1121 #ifdef PNG_SETJMP_SUPPORTED 1122 jmp_buf jmpbuf; /* used in png_error */ 1123 #endif 1124 png_error_ptr error_fn; /* function for printing errors and aborting */ 1125 png_error_ptr warning_fn; /* function for printing warnings */ 1126 png_voidp error_ptr; /* user supplied struct for error functions */ 1127 png_rw_ptr write_data_fn; /* function for writing output data */ 1128 png_rw_ptr read_data_fn; /* function for reading input data */ 1129 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1130 1131 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1132 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1133 #endif 1134 1135 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1136 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1137 #endif 1138 1139 /* These were added in libpng-1.0.2 */ 1140 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1141 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1142 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1143 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1144 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1145 png_byte user_transform_channels; /* channels in user transformed pixels */ 1146 #endif 1147 #endif 1148 1149 png_uint_32 mode; /* tells us where we are in the PNG file */ 1150 png_uint_32 flags; /* flags indicating various things to libpng */ 1151 png_uint_32 transformations; /* which transformations to perform */ 1152 1153 z_stream zstream; /* pointer to decompression structure (below) */ 1154 png_bytep zbuf; /* buffer for zlib */ 1155 png_size_t zbuf_size; /* size of zbuf */ 1156 int zlib_level; /* holds zlib compression level */ 1157 int zlib_method; /* holds zlib compression method */ 1158 int zlib_window_bits; /* holds zlib compression window bits */ 1159 int zlib_mem_level; /* holds zlib compression memory level */ 1160 int zlib_strategy; /* holds zlib compression strategy */ 1161 1162 png_uint_32 width; /* width of image in pixels */ 1163 png_uint_32 height; /* height of image in pixels */ 1164 png_uint_32 num_rows; /* number of rows in current pass */ 1165 png_uint_32 usr_width; /* width of row at start of write */ 1166 png_uint_32 rowbytes; /* size of row in bytes */ 1167 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1168 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1169 png_uint_32 row_number; /* current row in interlace pass */ 1170 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1171 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1172 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1173 png_bytep up_row; /* buffer to save "up" row when filtering */ 1174 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1175 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1176 png_row_info row_info; /* used for transformation routines */ 1177 1178 png_uint_32 idat_size; /* current IDAT size for read */ 1179 png_uint_32 crc; /* current chunk CRC value */ 1180 png_colorp palette; /* palette from the input file */ 1181 png_uint_16 num_palette; /* number of color entries in palette */ 1182 png_uint_16 num_trans; /* number of transparency values */ 1183 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1184 png_byte compression; /* file compression type (always 0) */ 1185 png_byte filter; /* file filter type (always 0) */ 1186 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1187 png_byte pass; /* current interlace pass (0 - 6) */ 1188 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1189 png_byte color_type; /* color type of file */ 1190 png_byte bit_depth; /* bit depth of file */ 1191 png_byte usr_bit_depth; /* bit depth of users row */ 1192 png_byte pixel_depth; /* number of bits per pixel */ 1193 png_byte channels; /* number of channels in file */ 1194 png_byte usr_channels; /* channels at start of write */ 1195 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1196 1197 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1198 #ifdef PNG_LEGACY_SUPPORTED 1199 png_byte filler; /* filler byte for pixel expansion */ 1200 #else 1201 png_uint_16 filler; /* filler bytes for pixel expansion */ 1202 #endif 1203 #endif 1204 1205 #if defined(PNG_bKGD_SUPPORTED) 1206 png_byte background_gamma_type; 1207 # ifdef PNG_FLOATING_POINT_SUPPORTED 1208 float background_gamma; 1209 # endif 1210 png_color_16 background; /* background color in screen gamma space */ 1211 #if defined(PNG_READ_GAMMA_SUPPORTED) 1212 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1213 #endif 1214 #endif /* PNG_bKGD_SUPPORTED */ 1215 1216 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1217 png_flush_ptr output_flush_fn;/* Function for flushing output */ 1218 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1219 png_uint_32 flush_rows; /* number of rows written since last flush */ 1220 #endif 1221 1222 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1223 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1224 #ifdef PNG_FLOATING_POINT_SUPPORTED 1225 float gamma; /* file gamma value */ 1226 float screen_gamma; /* screen gamma value (display_exponent) */ 1227 #endif 1228 #endif 1229 1230 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1231 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1232 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1233 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1234 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1235 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1236 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1237 #endif 1238 1239 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1240 png_color_8 sig_bit; /* significant bits in each available channel */ 1241 #endif 1242 1243 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1244 png_color_8 shift; /* shift for significant bit tranformation */ 1245 #endif 1246 1247 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1248 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1249 png_bytep trans; /* transparency values for paletted files */ 1250 png_color_16 trans_values; /* transparency values for non-paletted files */ 1251 #endif 1252 1253 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1254 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1255 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1256 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1257 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1258 png_progressive_end_ptr end_fn; /* called after image is complete */ 1259 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1260 png_bytep save_buffer; /* buffer for previously read data */ 1261 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1262 png_bytep current_buffer; /* buffer for recently used data */ 1263 png_uint_32 push_length; /* size of current input chunk */ 1264 png_uint_32 skip_length; /* bytes to skip in input data */ 1265 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1266 png_size_t save_buffer_max; /* total size of save_buffer */ 1267 png_size_t buffer_size; /* total amount of available input data */ 1268 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1269 int process_mode; /* what push library is currently doing */ 1270 int cur_palette; /* current push library palette index */ 1271 1272 # if defined(PNG_TEXT_SUPPORTED) 1273 png_size_t current_text_size; /* current size of text input data */ 1274 png_size_t current_text_left; /* how much text left to read in input */ 1275 png_charp current_text; /* current text chunk buffer */ 1276 png_charp current_text_ptr; /* current location in current_text */ 1277 # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ 1278 1279 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1280 1281 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1282 /* for the Borland special 64K segment handler */ 1283 png_bytepp offset_table_ptr; 1284 png_bytep offset_table; 1285 png_uint_16 offset_table_number; 1286 png_uint_16 offset_table_count; 1287 png_uint_16 offset_table_count_free; 1288 #endif 1289 1290 #if defined(PNG_READ_DITHER_SUPPORTED) 1291 png_bytep palette_lookup; /* lookup table for dithering */ 1292 png_bytep dither_index; /* index translation for palette files */ 1293 #endif 1294 1295 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1296 png_uint_16p hist; /* histogram */ 1297 #endif 1298 1299 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1300 png_byte heuristic_method; /* heuristic for row filter selection */ 1301 png_byte num_prev_filters; /* number of weights for previous rows */ 1302 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1303 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1304 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1305 png_uint_16p filter_costs; /* relative filter calculation cost */ 1306 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1307 #endif 1308 1309 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1310 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1311 #endif 1312 1313 /* New members added in libpng-1.0.6 */ 1314 1315 #ifdef PNG_FREE_ME_SUPPORTED 1316 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1317 #endif 1318 1319 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1320 png_voidp user_chunk_ptr; 1321 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1322 #endif 1323 1324 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1325 int num_chunk_list; 1326 png_bytep chunk_list; 1327 #endif 1328 1329 /* New members added in libpng-1.0.3 */ 1330 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1331 png_byte rgb_to_gray_status; 1332 /* These were changed from png_byte in libpng-1.0.6 */ 1333 png_uint_16 rgb_to_gray_red_coeff; 1334 png_uint_16 rgb_to_gray_green_coeff; 1335 png_uint_16 rgb_to_gray_blue_coeff; 1336 #endif 1337 1338 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1339 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1340 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1341 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1342 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1343 #ifdef PNG_1_0_X 1344 png_byte mng_features_permitted; 1345 #else 1346 png_uint_32 mng_features_permitted; 1347 #endif /* PNG_1_0_X */ 1348 #endif 1349 1350 /* New member added in libpng-1.0.7 */ 1351 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1352 png_fixed_point int_gamma; 1353 #endif 1354 1355 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1356 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1357 png_byte filter_type; 1358 #endif 1359 1360 #if defined(PNG_1_0_X) 1361 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1362 png_uint_32 row_buf_size; 1363 #endif 1364 1365 /* New members added in libpng-1.2.0 */ 1366 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1367 # if !defined(PNG_1_0_X) 1368 # if defined(PNG_MMX_CODE_SUPPORTED) 1369 png_byte mmx_bitdepth_threshold; 1370 png_uint_32 mmx_rowbytes_threshold; 1371 # endif 1372 png_uint_32 asm_flags; 1373 # endif 1374 #endif 1375 1376 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1377 #ifdef PNG_USER_MEM_SUPPORTED 1378 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1379 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1380 png_free_ptr free_fn; /* function for freeing memory */ 1381 #endif 1382 1383 /* New member added in libpng-1.0.13 and 1.2.0 */ 1384 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1385 1386 #if defined(PNG_READ_DITHER_SUPPORTED) 1387 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1388 png_bytep dither_sort; /* working sort array */ 1389 png_bytep index_to_palette; /* where the original index currently is */ 1390 /* in the palette */ 1391 png_bytep palette_to_index; /* which original index points to this */ 1392 /* palette color */ 1393 #endif 1394 1395 /* New members added in libpng-1.0.16 and 1.2.6 */ 1396 png_byte compression_type; 1397 1398 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1399 png_uint_32 user_width_max; 1400 png_uint_32 user_height_max; 1401 #endif 1402 1403 /* New member added in libpng-1.0.25 and 1.2.17 */ 1404 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1405 /* storage for unknown chunk that the library doesn't recognize. */ 1406 png_unknown_chunk unknown_chunk; 1407 #endif 1408 }; 1409 1410 1411 /* This triggers a compiler error in png.c, if png.c and png.h 1412 * do not agree upon the version number. 1413 */ 1414 typedef png_structp version_1_2_19; 1415 1416 typedef png_struct FAR * FAR * png_structpp; 1417 1418 /* Here are the function definitions most commonly used. This is not 1419 * the place to find out how to use libpng. See libpng.txt for the 1420 * full explanation, see example.c for the summary. This just provides 1421 * a simple one line description of the use of each function. 1422 */ 1423 1424 /* Returns the version number of the library */ 1425 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1426 1427 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1428 * Handling more than 8 bytes from the beginning of the file is an error. 1429 */ 1430 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1431 int num_bytes)); 1432 1433 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1434 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1435 * signature, and non-zero otherwise. Having num_to_check == 0 or 1436 * start > 7 will always fail (ie return non-zero). 1437 */ 1438 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1439 png_size_t num_to_check)); 1440 1441 /* Simple signature checking function. This is the same as calling 1442 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1443 */ 1444 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1445 1446 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1447 extern PNG_EXPORT(png_structp,png_create_read_struct) 1448 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1449 png_error_ptr error_fn, png_error_ptr warn_fn)); 1450 1451 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1452 extern PNG_EXPORT(png_structp,png_create_write_struct) 1453 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1454 png_error_ptr error_fn, png_error_ptr warn_fn)); 1455 1456 #ifdef PNG_WRITE_SUPPORTED 1457 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1458 PNGARG((png_structp png_ptr)); 1459 #endif 1460 1461 #ifdef PNG_WRITE_SUPPORTED 1462 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1463 PNGARG((png_structp png_ptr, png_uint_32 size)); 1464 #endif 1465 1466 /* Reset the compression stream */ 1467 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1468 1469 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1470 #ifdef PNG_USER_MEM_SUPPORTED 1471 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1472 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1473 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1474 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1475 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1476 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1477 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1478 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1479 #endif 1480 1481 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1482 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1483 png_bytep chunk_name, png_bytep data, png_size_t length)); 1484 1485 /* Write the start of a PNG chunk - length and chunk name. */ 1486 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1487 png_bytep chunk_name, png_uint_32 length)); 1488 1489 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1490 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1491 png_bytep data, png_size_t length)); 1492 1493 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1494 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1495 1496 /* Allocate and initialize the info structure */ 1497 extern PNG_EXPORT(png_infop,png_create_info_struct) 1498 PNGARG((png_structp png_ptr)); 1499 1500 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1501 /* Initialize the info structure (old interface - DEPRECATED) */ 1502 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1503 #undef png_info_init 1504 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1505 png_sizeof(png_info)); 1506 #endif 1507 1508 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1509 png_size_t png_info_struct_size)); 1510 1511 /* Writes all the PNG information before the image. */ 1512 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1513 png_infop info_ptr)); 1514 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1515 png_infop info_ptr)); 1516 1517 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1518 /* read the information before the actual image data. */ 1519 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1520 png_infop info_ptr)); 1521 #endif 1522 1523 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1524 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1525 PNGARG((png_structp png_ptr, png_timep ptime)); 1526 #endif 1527 1528 #if !defined(_WIN32_WCE) 1529 /* "time.h" functions are not supported on WindowsCE */ 1530 #if defined(PNG_WRITE_tIME_SUPPORTED) 1531 /* convert from a struct tm to png_time */ 1532 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1533 struct tm FAR * ttime)); 1534 1535 /* convert from time_t to png_time. Uses gmtime() */ 1536 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1537 time_t ttime)); 1538 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1539 #endif /* _WIN32_WCE */ 1540 1541 #if defined(PNG_READ_EXPAND_SUPPORTED) 1542 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1543 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1544 #if !defined(PNG_1_0_X) 1545 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1546 png_ptr)); 1547 #endif 1548 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1549 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1550 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1551 /* Deprecated */ 1552 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1553 #endif 1554 #endif 1555 1556 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1557 /* Use blue, green, red order for pixels. */ 1558 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1559 #endif 1560 1561 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1562 /* Expand the grayscale to 24-bit RGB if necessary. */ 1563 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1564 #endif 1565 1566 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1567 /* Reduce RGB to grayscale. */ 1568 #ifdef PNG_FLOATING_POINT_SUPPORTED 1569 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1570 int error_action, double red, double green )); 1571 #endif 1572 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1573 int error_action, png_fixed_point red, png_fixed_point green )); 1574 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1575 png_ptr)); 1576 #endif 1577 1578 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1579 png_colorp palette)); 1580 1581 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1582 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1583 #endif 1584 1585 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1586 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1587 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1588 #endif 1589 1590 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1591 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1592 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1593 #endif 1594 1595 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1596 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1597 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1598 png_uint_32 filler, int flags)); 1599 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1600 #define PNG_FILLER_BEFORE 0 1601 #define PNG_FILLER_AFTER 1 1602 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1603 #if !defined(PNG_1_0_X) 1604 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1605 png_uint_32 filler, int flags)); 1606 #endif 1607 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1608 1609 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1610 /* Swap bytes in 16-bit depth files. */ 1611 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1612 #endif 1613 1614 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1615 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1616 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1617 #endif 1618 1619 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1620 /* Swap packing order of pixels in bytes. */ 1621 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1622 #endif 1623 1624 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1625 /* Converts files to legal bit depths. */ 1626 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1627 png_color_8p true_bits)); 1628 #endif 1629 1630 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1631 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1632 /* Have the code handle the interlacing. Returns the number of passes. */ 1633 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1634 #endif 1635 1636 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1637 /* Invert monochrome files */ 1638 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1639 #endif 1640 1641 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1642 /* Handle alpha and tRNS by replacing with a background color. */ 1643 #ifdef PNG_FLOATING_POINT_SUPPORTED 1644 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1645 png_color_16p background_color, int background_gamma_code, 1646 int need_expand, double background_gamma)); 1647 #endif 1648 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1649 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1650 #define PNG_BACKGROUND_GAMMA_FILE 2 1651 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1652 #endif 1653 1654 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1655 /* strip the second byte of information from a 16-bit depth file. */ 1656 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1657 #endif 1658 1659 #if defined(PNG_READ_DITHER_SUPPORTED) 1660 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1661 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1662 png_colorp palette, int num_palette, int maximum_colors, 1663 png_uint_16p histogram, int full_dither)); 1664 #endif 1665 1666 #if defined(PNG_READ_GAMMA_SUPPORTED) 1667 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1668 #ifdef PNG_FLOATING_POINT_SUPPORTED 1669 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1670 double screen_gamma, double default_file_gamma)); 1671 #endif 1672 #endif 1673 1674 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1675 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1676 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1677 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1678 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1679 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1680 int empty_plte_permitted)); 1681 #endif 1682 #endif 1683 1684 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1685 /* Set how many lines between output flushes - 0 for no flushing */ 1686 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1687 /* Flush the current PNG output buffer */ 1688 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1689 #endif 1690 1691 /* optional update palette with requested transformations */ 1692 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1693 1694 /* optional call to update the users info structure */ 1695 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1696 png_infop info_ptr)); 1697 1698 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1699 /* read one or more rows of image data. */ 1700 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1701 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1702 #endif 1703 1704 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1705 /* read a row of data. */ 1706 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1707 png_bytep row, 1708 png_bytep display_row)); 1709 #endif 1710 1711 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1712 /* read the whole image into memory at once. */ 1713 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1714 png_bytepp image)); 1715 #endif 1716 1717 /* write a row of image data */ 1718 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1719 png_bytep row)); 1720 1721 /* write a few rows of image data */ 1722 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1723 png_bytepp row, png_uint_32 num_rows)); 1724 1725 /* write the image data */ 1726 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1727 png_bytepp image)); 1728 1729 /* writes the end of the PNG file. */ 1730 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1731 png_infop info_ptr)); 1732 1733 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1734 /* read the end of the PNG file. */ 1735 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1736 png_infop info_ptr)); 1737 #endif 1738 1739 /* free any memory associated with the png_info_struct */ 1740 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1741 png_infopp info_ptr_ptr)); 1742 1743 /* free any memory associated with the png_struct and the png_info_structs */ 1744 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1745 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1746 1747 /* free all memory used by the read (old method - NOT DLL EXPORTED) */ 1748 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1749 png_infop end_info_ptr)); 1750 1751 /* free any memory associated with the png_struct and the png_info_structs */ 1752 extern PNG_EXPORT(void,png_destroy_write_struct) 1753 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1754 1755 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1756 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1757 1758 /* set the libpng method of handling chunk CRC errors */ 1759 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1760 int crit_action, int ancil_action)); 1761 1762 /* Values for png_set_crc_action() to say how to handle CRC errors in 1763 * ancillary and critical chunks, and whether to use the data contained 1764 * therein. Note that it is impossible to "discard" data in a critical 1765 * chunk. For versions prior to 0.90, the action was always error/quit, 1766 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1767 * chunks is warn/discard. These values should NOT be changed. 1768 * 1769 * value action:critical action:ancillary 1770 */ 1771 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1772 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1773 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1774 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1775 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1776 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1777 1778 /* These functions give the user control over the scan-line filtering in 1779 * libpng and the compression methods used by zlib. These functions are 1780 * mainly useful for testing, as the defaults should work with most users. 1781 * Those users who are tight on memory or want faster performance at the 1782 * expense of compression can modify them. See the compression library 1783 * header file (zlib.h) for an explination of the compression functions. 1784 */ 1785 1786 /* set the filtering method(s) used by libpng. Currently, the only valid 1787 * value for "method" is 0. 1788 */ 1789 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1790 int filters)); 1791 1792 /* Flags for png_set_filter() to say which filters to use. The flags 1793 * are chosen so that they don't conflict with real filter types 1794 * below, in case they are supplied instead of the #defined constants. 1795 * These values should NOT be changed. 1796 */ 1797 #define PNG_NO_FILTERS 0x00 1798 #define PNG_FILTER_NONE 0x08 1799 #define PNG_FILTER_SUB 0x10 1800 #define PNG_FILTER_UP 0x20 1801 #define PNG_FILTER_AVG 0x40 1802 #define PNG_FILTER_PAETH 0x80 1803 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1804 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1805 1806 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1807 * These defines should NOT be changed. 1808 */ 1809 #define PNG_FILTER_VALUE_NONE 0 1810 #define PNG_FILTER_VALUE_SUB 1 1811 #define PNG_FILTER_VALUE_UP 2 1812 #define PNG_FILTER_VALUE_AVG 3 1813 #define PNG_FILTER_VALUE_PAETH 4 1814 #define PNG_FILTER_VALUE_LAST 5 1815 1816 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1817 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1818 * defines, either the default (minimum-sum-of-absolute-differences), or 1819 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1820 * 1821 * Weights are factors >= 1.0, indicating how important it is to keep the 1822 * filter type consistent between rows. Larger numbers mean the current 1823 * filter is that many times as likely to be the same as the "num_weights" 1824 * previous filters. This is cumulative for each previous row with a weight. 1825 * There needs to be "num_weights" values in "filter_weights", or it can be 1826 * NULL if the weights aren't being specified. Weights have no influence on 1827 * the selection of the first row filter. Well chosen weights can (in theory) 1828 * improve the compression for a given image. 1829 * 1830 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1831 * filter type. Higher costs indicate more decoding expense, and are 1832 * therefore less likely to be selected over a filter with lower computational 1833 * costs. There needs to be a value in "filter_costs" for each valid filter 1834 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1835 * setting the costs. Costs try to improve the speed of decompression without 1836 * unduly increasing the compressed image size. 1837 * 1838 * A negative weight or cost indicates the default value is to be used, and 1839 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1840 * The default values for both weights and costs are currently 1.0, but may 1841 * change if good general weighting/cost heuristics can be found. If both 1842 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1843 * to the UNWEIGHTED method, but with added encoding time/computation. 1844 */ 1845 #ifdef PNG_FLOATING_POINT_SUPPORTED 1846 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1847 int heuristic_method, int num_weights, png_doublep filter_weights, 1848 png_doublep filter_costs)); 1849 #endif 1850 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1851 1852 /* Heuristic used for row filter selection. These defines should NOT be 1853 * changed. 1854 */ 1855 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1856 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1857 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1858 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1859 1860 /* Set the library compression level. Currently, valid values range from 1861 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1862 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1863 * shown that zlib compression levels 3-6 usually perform as well as level 9 1864 * for PNG images, and do considerably fewer caclulations. In the future, 1865 * these values may not correspond directly to the zlib compression levels. 1866 */ 1867 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1868 int level)); 1869 1870 extern PNG_EXPORT(void,png_set_compression_mem_level) 1871 PNGARG((png_structp png_ptr, int mem_level)); 1872 1873 extern PNG_EXPORT(void,png_set_compression_strategy) 1874 PNGARG((png_structp png_ptr, int strategy)); 1875 1876 extern PNG_EXPORT(void,png_set_compression_window_bits) 1877 PNGARG((png_structp png_ptr, int window_bits)); 1878 1879 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1880 int method)); 1881 1882 /* These next functions are called for input/output, memory, and error 1883 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1884 * and call standard C I/O routines such as fread(), fwrite(), and 1885 * fprintf(). These functions can be made to use other I/O routines 1886 * at run time for those applications that need to handle I/O in a 1887 * different manner by calling png_set_???_fn(). See libpng.txt for 1888 * more information. 1889 */ 1890 1891 #if !defined(PNG_NO_STDIO) 1892 /* Initialize the input/output for the PNG file to the default functions. */ 1893 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1894 #endif 1895 1896 /* Replace the (error and abort), and warning functions with user 1897 * supplied functions. If no messages are to be printed you must still 1898 * write and use replacement functions. The replacement error_fn should 1899 * still do a longjmp to the last setjmp location if you are using this 1900 * method of error handling. If error_fn or warning_fn is NULL, the 1901 * default function will be used. 1902 */ 1903 1904 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1905 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1906 1907 /* Return the user pointer associated with the error functions */ 1908 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1909 1910 /* Replace the default data output functions with a user supplied one(s). 1911 * If buffered output is not used, then output_flush_fn can be set to NULL. 1912 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1913 * output_flush_fn will be ignored (and thus can be NULL). 1914 */ 1915 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 1916 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 1917 1918 /* Replace the default data input function with a user supplied one. */ 1919 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 1920 png_voidp io_ptr, png_rw_ptr read_data_fn)); 1921 1922 /* Return the user pointer associated with the I/O functions */ 1923 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 1924 1925 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 1926 png_read_status_ptr read_row_fn)); 1927 1928 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 1929 png_write_status_ptr write_row_fn)); 1930 1931 #ifdef PNG_USER_MEM_SUPPORTED 1932 /* Replace the default memory allocation functions with user supplied one(s). */ 1933 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 1934 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1935 /* Return the user pointer associated with the memory functions */ 1936 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 1937 #endif 1938 1939 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1940 defined(PNG_LEGACY_SUPPORTED) 1941 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 1942 png_ptr, png_user_transform_ptr read_user_transform_fn)); 1943 #endif 1944 1945 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1946 defined(PNG_LEGACY_SUPPORTED) 1947 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 1948 png_ptr, png_user_transform_ptr write_user_transform_fn)); 1949 #endif 1950 1951 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1952 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1953 defined(PNG_LEGACY_SUPPORTED) 1954 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 1955 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 1956 int user_transform_channels)); 1957 /* Return the user pointer associated with the user transform functions */ 1958 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 1959 PNGARG((png_structp png_ptr)); 1960 #endif 1961 1962 #ifdef PNG_USER_CHUNKS_SUPPORTED 1963 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 1964 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 1965 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 1966 png_ptr)); 1967 #endif 1968 1969 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1970 /* Sets the function callbacks for the push reader, and a pointer to a 1971 * user-defined structure available to the callback functions. 1972 */ 1973 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 1974 png_voidp progressive_ptr, 1975 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 1976 png_progressive_end_ptr end_fn)); 1977 1978 /* returns the user pointer associated with the push read functions */ 1979 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 1980 PNGARG((png_structp png_ptr)); 1981 1982 /* function to be called when data becomes available */ 1983 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 1984 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 1985 1986 /* function that combines rows. Not very much different than the 1987 * png_combine_row() call. Is this even used????? 1988 */ 1989 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 1990 png_bytep old_row, png_bytep new_row)); 1991 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1992 1993 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 1994 png_uint_32 size)); 1995 1996 #if defined(PNG_1_0_X) 1997 # define png_malloc_warn png_malloc 1998 #else 1999 /* Added at libpng version 1.2.4 */ 2000 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2001 png_uint_32 size)); 2002 #endif 2003 2004 /* frees a pointer allocated by png_malloc() */ 2005 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2006 2007 #if defined(PNG_1_0_X) 2008 /* Function to allocate memory for zlib. */ 2009 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2010 uInt size)); 2011 2012 /* Function to free memory for zlib */ 2013 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2014 #endif 2015 2016 /* Free data that was allocated internally */ 2017 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2018 png_infop info_ptr, png_uint_32 free_me, int num)); 2019 #ifdef PNG_FREE_ME_SUPPORTED 2020 /* Reassign responsibility for freeing existing data, whether allocated 2021 * by libpng or by the application */ 2022 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2023 png_infop info_ptr, int freer, png_uint_32 mask)); 2024 #endif 2025 /* assignments for png_data_freer */ 2026 #define PNG_DESTROY_WILL_FREE_DATA 1 2027 #define PNG_SET_WILL_FREE_DATA 1 2028 #define PNG_USER_WILL_FREE_DATA 2 2029 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2030 #define PNG_FREE_HIST 0x0008 2031 #define PNG_FREE_ICCP 0x0010 2032 #define PNG_FREE_SPLT 0x0020 2033 #define PNG_FREE_ROWS 0x0040 2034 #define PNG_FREE_PCAL 0x0080 2035 #define PNG_FREE_SCAL 0x0100 2036 #define PNG_FREE_UNKN 0x0200 2037 #define PNG_FREE_LIST 0x0400 2038 #define PNG_FREE_PLTE 0x1000 2039 #define PNG_FREE_TRNS 0x2000 2040 #define PNG_FREE_TEXT 0x4000 2041 #define PNG_FREE_ALL 0x7fff 2042 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2043 2044 #ifdef PNG_USER_MEM_SUPPORTED 2045 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2046 png_uint_32 size)); 2047 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2048 png_voidp ptr)); 2049 #endif 2050 2051 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2052 png_voidp s1, png_voidp s2, png_uint_32 size)); 2053 2054 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2055 png_voidp s1, int value, png_uint_32 size)); 2056 2057 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2058 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2059 int check)); 2060 #endif /* USE_FAR_KEYWORD */ 2061 2062 /* Fatal error in PNG image of libpng - can't continue */ 2063 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2064 png_const_charp error_message)); 2065 2066 /* The same, but the chunk name is prepended to the error string. */ 2067 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2068 png_const_charp error_message)); 2069 2070 #ifndef PNG_NO_WARNINGS 2071 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2072 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2073 png_const_charp warning_message)); 2074 2075 #ifdef PNG_READ_SUPPORTED 2076 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2077 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2078 png_const_charp warning_message)); 2079 #endif /* PNG_READ_SUPPORTED */ 2080 #endif /* PNG_NO_WARNINGS */ 2081 2082 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2083 * Similarly, the png_get_<chunk> calls are used to read values from the 2084 * png_info_struct, either storing the parameters in the passed variables, or 2085 * setting pointers into the png_info_struct where the data is stored. The 2086 * png_get_<chunk> functions return a non-zero value if the data was available 2087 * in info_ptr, or return zero and do not change any of the parameters if the 2088 * data was not available. 2089 * 2090 * These functions should be used instead of directly accessing png_info 2091 * to avoid problems with future changes in the size and internal layout of 2092 * png_info_struct. 2093 */ 2094 /* Returns "flag" if chunk data is valid in info_ptr. */ 2095 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2096 png_infop info_ptr, png_uint_32 flag)); 2097 2098 /* Returns number of bytes needed to hold a transformed row. */ 2099 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2100 png_infop info_ptr)); 2101 2102 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2103 /* Returns row_pointers, which is an array of pointers to scanlines that was 2104 returned from png_read_png(). */ 2105 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2106 png_infop info_ptr)); 2107 /* Set row_pointers, which is an array of pointers to scanlines for use 2108 by png_write_png(). */ 2109 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2110 png_infop info_ptr, png_bytepp row_pointers)); 2111 #endif 2112 2113 /* Returns number of color channels in image. */ 2114 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2115 png_infop info_ptr)); 2116 2117 #ifdef PNG_EASY_ACCESS_SUPPORTED 2118 /* Returns image width in pixels. */ 2119 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2120 png_ptr, png_infop info_ptr)); 2121 2122 /* Returns image height in pixels. */ 2123 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2124 png_ptr, png_infop info_ptr)); 2125 2126 /* Returns image bit_depth. */ 2127 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2128 png_ptr, png_infop info_ptr)); 2129 2130 /* Returns image color_type. */ 2131 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2132 png_ptr, png_infop info_ptr)); 2133 2134 /* Returns image filter_type. */ 2135 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2136 png_ptr, png_infop info_ptr)); 2137 2138 /* Returns image interlace_type. */ 2139 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2140 png_ptr, png_infop info_ptr)); 2141 2142 /* Returns image compression_type. */ 2143 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2144 png_ptr, png_infop info_ptr)); 2145 2146 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2147 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2148 png_ptr, png_infop info_ptr)); 2149 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2150 png_ptr, png_infop info_ptr)); 2151 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2152 png_ptr, png_infop info_ptr)); 2153 2154 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2155 #ifdef PNG_FLOATING_POINT_SUPPORTED 2156 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2157 png_ptr, png_infop info_ptr)); 2158 #endif 2159 2160 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2161 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2162 png_ptr, png_infop info_ptr)); 2163 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2164 png_ptr, png_infop info_ptr)); 2165 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2166 png_ptr, png_infop info_ptr)); 2167 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2168 png_ptr, png_infop info_ptr)); 2169 2170 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2171 2172 /* Returns pointer to signature string read from PNG header */ 2173 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2174 png_infop info_ptr)); 2175 2176 #if defined(PNG_bKGD_SUPPORTED) 2177 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2178 png_infop info_ptr, png_color_16p *background)); 2179 #endif 2180 2181 #if defined(PNG_bKGD_SUPPORTED) 2182 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2183 png_infop info_ptr, png_color_16p background)); 2184 #endif 2185 2186 #if defined(PNG_cHRM_SUPPORTED) 2187 #ifdef PNG_FLOATING_POINT_SUPPORTED 2188 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2189 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2190 double *red_y, double *green_x, double *green_y, double *blue_x, 2191 double *blue_y)); 2192 #endif 2193 #ifdef PNG_FIXED_POINT_SUPPORTED 2194 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2195 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2196 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2197 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2198 *int_blue_x, png_fixed_point *int_blue_y)); 2199 #endif 2200 #endif 2201 2202 #if defined(PNG_cHRM_SUPPORTED) 2203 #ifdef PNG_FLOATING_POINT_SUPPORTED 2204 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2205 png_infop info_ptr, double white_x, double white_y, double red_x, 2206 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2207 #endif 2208 #ifdef PNG_FIXED_POINT_SUPPORTED 2209 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2210 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2211 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2212 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2213 png_fixed_point int_blue_y)); 2214 #endif 2215 #endif 2216 2217 #if defined(PNG_gAMA_SUPPORTED) 2218 #ifdef PNG_FLOATING_POINT_SUPPORTED 2219 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2220 png_infop info_ptr, double *file_gamma)); 2221 #endif 2222 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2223 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2224 #endif 2225 2226 #if defined(PNG_gAMA_SUPPORTED) 2227 #ifdef PNG_FLOATING_POINT_SUPPORTED 2228 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2229 png_infop info_ptr, double file_gamma)); 2230 #endif 2231 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2232 png_infop info_ptr, png_fixed_point int_file_gamma)); 2233 #endif 2234 2235 #if defined(PNG_hIST_SUPPORTED) 2236 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2237 png_infop info_ptr, png_uint_16p *hist)); 2238 #endif 2239 2240 #if defined(PNG_hIST_SUPPORTED) 2241 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2242 png_infop info_ptr, png_uint_16p hist)); 2243 #endif 2244 2245 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2246 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2247 int *bit_depth, int *color_type, int *interlace_method, 2248 int *compression_method, int *filter_method)); 2249 2250 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2251 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2252 int color_type, int interlace_method, int compression_method, 2253 int filter_method)); 2254 2255 #if defined(PNG_oFFs_SUPPORTED) 2256 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2257 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2258 int *unit_type)); 2259 #endif 2260 2261 #if defined(PNG_oFFs_SUPPORTED) 2262 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2263 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2264 int unit_type)); 2265 #endif 2266 2267 #if defined(PNG_pCAL_SUPPORTED) 2268 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2269 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2270 int *type, int *nparams, png_charp *units, png_charpp *params)); 2271 #endif 2272 2273 #if defined(PNG_pCAL_SUPPORTED) 2274 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2275 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2276 int type, int nparams, png_charp units, png_charpp params)); 2277 #endif 2278 2279 #if defined(PNG_pHYs_SUPPORTED) 2280 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2281 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2282 #endif 2283 2284 #if defined(PNG_pHYs_SUPPORTED) 2285 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2286 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2287 #endif 2288 2289 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2290 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2291 2292 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2293 png_infop info_ptr, png_colorp palette, int num_palette)); 2294 2295 #if defined(PNG_sBIT_SUPPORTED) 2296 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2297 png_infop info_ptr, png_color_8p *sig_bit)); 2298 #endif 2299 2300 #if defined(PNG_sBIT_SUPPORTED) 2301 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2302 png_infop info_ptr, png_color_8p sig_bit)); 2303 #endif 2304 2305 #if defined(PNG_sRGB_SUPPORTED) 2306 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2307 png_infop info_ptr, int *intent)); 2308 #endif 2309 2310 #if defined(PNG_sRGB_SUPPORTED) 2311 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2312 png_infop info_ptr, int intent)); 2313 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2314 png_infop info_ptr, int intent)); 2315 #endif 2316 2317 #if defined(PNG_iCCP_SUPPORTED) 2318 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2319 png_infop info_ptr, png_charpp name, int *compression_type, 2320 png_charpp profile, png_uint_32 *proflen)); 2321 /* Note to maintainer: profile should be png_bytepp */ 2322 #endif 2323 2324 #if defined(PNG_iCCP_SUPPORTED) 2325 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2326 png_infop info_ptr, png_charp name, int compression_type, 2327 png_charp profile, png_uint_32 proflen)); 2328 /* Note to maintainer: profile should be png_bytep */ 2329 #endif 2330 2331 #if defined(PNG_sPLT_SUPPORTED) 2332 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2333 png_infop info_ptr, png_sPLT_tpp entries)); 2334 #endif 2335 2336 #if defined(PNG_sPLT_SUPPORTED) 2337 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2338 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2339 #endif 2340 2341 #if defined(PNG_TEXT_SUPPORTED) 2342 /* png_get_text also returns the number of text chunks in *num_text */ 2343 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2344 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2345 #endif 2346 2347 /* 2348 * Note while png_set_text() will accept a structure whose text, 2349 * language, and translated keywords are NULL pointers, the structure 2350 * returned by png_get_text will always contain regular 2351 * zero-terminated C strings. They might be empty strings but 2352 * they will never be NULL pointers. 2353 */ 2354 2355 #if defined(PNG_TEXT_SUPPORTED) 2356 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2357 png_infop info_ptr, png_textp text_ptr, int num_text)); 2358 #endif 2359 2360 #if defined(PNG_tIME_SUPPORTED) 2361 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2362 png_infop info_ptr, png_timep *mod_time)); 2363 #endif 2364 2365 #if defined(PNG_tIME_SUPPORTED) 2366 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2367 png_infop info_ptr, png_timep mod_time)); 2368 #endif 2369 2370 #if defined(PNG_tRNS_SUPPORTED) 2371 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2372 png_infop info_ptr, png_bytep *trans, int *num_trans, 2373 png_color_16p *trans_values)); 2374 #endif 2375 2376 #if defined(PNG_tRNS_SUPPORTED) 2377 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2378 png_infop info_ptr, png_bytep trans, int num_trans, 2379 png_color_16p trans_values)); 2380 #endif 2381 2382 #if defined(PNG_tRNS_SUPPORTED) 2383 #endif 2384 2385 #if defined(PNG_sCAL_SUPPORTED) 2386 #ifdef PNG_FLOATING_POINT_SUPPORTED 2387 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2388 png_infop info_ptr, int *unit, double *width, double *height)); 2389 #else 2390 #ifdef PNG_FIXED_POINT_SUPPORTED 2391 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2392 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2393 #endif 2394 #endif 2395 #endif /* PNG_sCAL_SUPPORTED */ 2396 2397 #if defined(PNG_sCAL_SUPPORTED) 2398 #ifdef PNG_FLOATING_POINT_SUPPORTED 2399 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2400 png_infop info_ptr, int unit, double width, double height)); 2401 #else 2402 #ifdef PNG_FIXED_POINT_SUPPORTED 2403 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2404 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2405 #endif 2406 #endif 2407 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2408 2409 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2410 /* provide a list of chunks and how they are to be handled, if the built-in 2411 handling or default unknown chunk handling is not desired. Any chunks not 2412 listed will be handled in the default manner. The IHDR and IEND chunks 2413 must not be listed. 2414 keep = 0: follow default behaviour 2415 = 1: do not keep 2416 = 2: keep only if safe-to-copy 2417 = 3: keep even if unsafe-to-copy 2418 */ 2419 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2420 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2421 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2422 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2423 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2424 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2425 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2426 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2427 #endif 2428 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2429 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2430 chunk_name)); 2431 #endif 2432 2433 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2434 If you need to turn it off for a chunk that your application has freed, 2435 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ 2436 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2437 png_infop info_ptr, int mask)); 2438 2439 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2440 /* The "params" pointer is currently not used and is for future expansion. */ 2441 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2442 png_infop info_ptr, 2443 int transforms, 2444 png_voidp params)); 2445 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2446 png_infop info_ptr, 2447 int transforms, 2448 png_voidp params)); 2449 #endif 2450 2451 /* Define PNG_DEBUG at compile time for debugging information. Higher 2452 * numbers for PNG_DEBUG mean more debugging information. This has 2453 * only been added since version 0.95 so it is not implemented throughout 2454 * libpng yet, but more support will be added as needed. 2455 */ 2456 #ifdef PNG_DEBUG 2457 #if (PNG_DEBUG > 0) 2458 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2459 #include <crtdbg.h> 2460 #if (PNG_DEBUG > 1) 2461 #define png_debug(l,m) _RPT0(_CRT_WARN,m) 2462 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) 2463 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) 2464 #endif 2465 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2466 #ifndef PNG_DEBUG_FILE 2467 #define PNG_DEBUG_FILE stderr 2468 #endif /* PNG_DEBUG_FILE */ 2469 #if (PNG_DEBUG > 1) 2470 #define png_debug(l,m) \ 2471 { \ 2472 int num_tabs=l; \ 2473 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2474 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2475 } 2476 #define png_debug1(l,m,p1) \ 2477 { \ 2478 int num_tabs=l; \ 2479 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2480 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2481 } 2482 #define png_debug2(l,m,p1,p2) \ 2483 { \ 2484 int num_tabs=l; \ 2485 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2486 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2487 } 2488 #endif /* (PNG_DEBUG > 1) */ 2489 #endif /* _MSC_VER */ 2490 #endif /* (PNG_DEBUG > 0) */ 2491 #endif /* PNG_DEBUG */ 2492 #ifndef png_debug 2493 #define png_debug(l, m) 2494 #endif 2495 #ifndef png_debug1 2496 #define png_debug1(l, m, p1) 2497 #endif 2498 #ifndef png_debug2 2499 #define png_debug2(l, m, p1, p2) 2500 #endif 2501 2502 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2503 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2504 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2505 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2506 2507 #ifdef PNG_MNG_FEATURES_SUPPORTED 2508 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2509 png_ptr, png_uint_32 mng_features_permitted)); 2510 #endif 2511 2512 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2513 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2514 #define PNG_HANDLE_CHUNK_NEVER 1 2515 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2516 #define PNG_HANDLE_CHUNK_ALWAYS 3 2517 2518 /* Added to version 1.2.0 */ 2519 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2520 #if defined(PNG_MMX_CODE_SUPPORTED) 2521 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2522 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2523 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2524 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2525 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2526 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2527 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2528 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2529 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2530 2531 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2532 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2533 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2534 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2535 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2536 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2537 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2538 2539 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2540 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2541 | PNG_MMX_READ_FLAGS \ 2542 | PNG_MMX_WRITE_FLAGS ) 2543 2544 #define PNG_SELECT_READ 1 2545 #define PNG_SELECT_WRITE 2 2546 #endif /* PNG_MMX_CODE_SUPPORTED */ 2547 2548 #if !defined(PNG_1_0_X) 2549 /* pngget.c */ 2550 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2551 PNGARG((int flag_select, int *compilerID)); 2552 2553 /* pngget.c */ 2554 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2555 PNGARG((int flag_select)); 2556 2557 /* pngget.c */ 2558 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2559 PNGARG((png_structp png_ptr)); 2560 2561 /* pngget.c */ 2562 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2563 PNGARG((png_structp png_ptr)); 2564 2565 /* pngget.c */ 2566 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2567 PNGARG((png_structp png_ptr)); 2568 2569 /* pngset.c */ 2570 extern PNG_EXPORT(void,png_set_asm_flags) 2571 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2572 2573 /* pngset.c */ 2574 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2575 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2576 png_uint_32 mmx_rowbytes_threshold)); 2577 2578 #endif /* PNG_1_0_X */ 2579 2580 #if !defined(PNG_1_0_X) 2581 /* png.c, pnggccrd.c, or pngvcrd.c */ 2582 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2583 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2584 2585 /* Strip the prepended error numbers ("#nnn ") from error and warning 2586 * messages before passing them to the error or warning handler. */ 2587 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2588 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2589 png_ptr, png_uint_32 strip_mode)); 2590 #endif 2591 2592 #endif /* PNG_1_0_X */ 2593 2594 /* Added at libpng-1.2.6 */ 2595 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2596 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2597 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2598 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2599 png_ptr)); 2600 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2601 png_ptr)); 2602 #endif 2603 2604 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ 2605 2606 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2607 /* With these routines we avoid an integer divide, which will be slower on 2608 * most machines. However, it does take more operations than the corresponding 2609 * divide method, so it may be slower on a few RISC systems. There are two 2610 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2611 * 2612 * Note that the rounding factors are NOT supposed to be the same! 128 and 2613 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2614 * standard method. 2615 * 2616 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2617 */ 2618 2619 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2620 2621 # define png_composite(composite, fg, alpha, bg) \ 2622 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2623 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2624 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2625 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2626 2627 # define png_composite_16(composite, fg, alpha, bg) \ 2628 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2629 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2630 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2631 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2632 2633 #else /* standard method using integer division */ 2634 2635 # define png_composite(composite, fg, alpha, bg) \ 2636 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2637 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2638 (png_uint_16)127) / 255) 2639 2640 # define png_composite_16(composite, fg, alpha, bg) \ 2641 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2642 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2643 (png_uint_32)32767) / (png_uint_32)65535L) 2644 2645 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2646 2647 /* Inline macros to do direct reads of bytes from the input buffer. These 2648 * require that you are using an architecture that uses PNG byte ordering 2649 * (MSB first) and supports unaligned data storage. I think that PowerPC 2650 * in big-endian mode and 680x0 are the only ones that will support this. 2651 * The x86 line of processors definitely do not. The png_get_int_32() 2652 * routine also assumes we are using two's complement format for negative 2653 * values, which is almost certainly true. 2654 */ 2655 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2656 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2657 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2658 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2659 #else 2660 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2661 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2662 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2663 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2664 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2665 PNGARG((png_structp png_ptr, png_bytep buf)); 2666 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2667 2668 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2669 */ 2670 extern PNG_EXPORT(void,png_save_uint_32) 2671 PNGARG((png_bytep buf, png_uint_32 i)); 2672 extern PNG_EXPORT(void,png_save_int_32) 2673 PNGARG((png_bytep buf, png_int_32 i)); 2674 2675 /* Place a 16-bit number into a buffer in PNG byte order. 2676 * The parameter is declared unsigned int, not png_uint_16, 2677 * just to avoid potential problems on pre-ANSI C compilers. 2678 */ 2679 extern PNG_EXPORT(void,png_save_uint_16) 2680 PNGARG((png_bytep buf, unsigned int i)); 2681 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2682 2683 /* ************************************************************************* */ 2684 2685 /* These next functions are used internally in the code. They generally 2686 * shouldn't be used unless you are writing code to add or replace some 2687 * functionality in libpng. More information about most functions can 2688 * be found in the files where the functions are located. 2689 */ 2690 2691 2692 /* Various modes of operation, that are visible to applications because 2693 * they are used for unknown chunk location. 2694 */ 2695 #define PNG_HAVE_IHDR 0x01 2696 #define PNG_HAVE_PLTE 0x02 2697 #define PNG_HAVE_IDAT 0x04 2698 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2699 #define PNG_HAVE_IEND 0x10 2700 2701 #if defined(PNG_INTERNAL) 2702 2703 /* More modes of operation. Note that after an init, mode is set to 2704 * zero automatically when the structure is created. 2705 */ 2706 #define PNG_HAVE_gAMA 0x20 2707 #define PNG_HAVE_cHRM 0x40 2708 #define PNG_HAVE_sRGB 0x80 2709 #define PNG_HAVE_CHUNK_HEADER 0x100 2710 #define PNG_WROTE_tIME 0x200 2711 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2712 #define PNG_BACKGROUND_IS_GRAY 0x800 2713 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2714 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2715 2716 /* flags for the transformations the PNG library does on the image data */ 2717 #define PNG_BGR 0x0001 2718 #define PNG_INTERLACE 0x0002 2719 #define PNG_PACK 0x0004 2720 #define PNG_SHIFT 0x0008 2721 #define PNG_SWAP_BYTES 0x0010 2722 #define PNG_INVERT_MONO 0x0020 2723 #define PNG_DITHER 0x0040 2724 #define PNG_BACKGROUND 0x0080 2725 #define PNG_BACKGROUND_EXPAND 0x0100 2726 /* 0x0200 unused */ 2727 #define PNG_16_TO_8 0x0400 2728 #define PNG_RGBA 0x0800 2729 #define PNG_EXPAND 0x1000 2730 #define PNG_GAMMA 0x2000 2731 #define PNG_GRAY_TO_RGB 0x4000 2732 #define PNG_FILLER 0x8000L 2733 #define PNG_PACKSWAP 0x10000L 2734 #define PNG_SWAP_ALPHA 0x20000L 2735 #define PNG_STRIP_ALPHA 0x40000L 2736 #define PNG_INVERT_ALPHA 0x80000L 2737 #define PNG_USER_TRANSFORM 0x100000L 2738 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2739 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2740 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2741 /* 0x800000L Unused */ 2742 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2743 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2744 /* 0x4000000L unused */ 2745 /* 0x8000000L unused */ 2746 /* 0x10000000L unused */ 2747 /* 0x20000000L unused */ 2748 /* 0x40000000L unused */ 2749 2750 /* flags for png_create_struct */ 2751 #define PNG_STRUCT_PNG 0x0001 2752 #define PNG_STRUCT_INFO 0x0002 2753 2754 /* Scaling factor for filter heuristic weighting calculations */ 2755 #define PNG_WEIGHT_SHIFT 8 2756 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2757 #define PNG_COST_SHIFT 3 2758 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2759 2760 /* flags for the png_ptr->flags rather than declaring a byte for each one */ 2761 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2762 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2763 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2764 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2765 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2766 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2767 #define PNG_FLAG_ROW_INIT 0x0040 2768 #define PNG_FLAG_FILLER_AFTER 0x0080 2769 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2770 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2771 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2772 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2773 #define PNG_FLAG_FREE_PLTE 0x1000 2774 #define PNG_FLAG_FREE_TRNS 0x2000 2775 #define PNG_FLAG_FREE_HIST 0x4000 2776 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2777 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2778 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2779 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2780 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2781 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2782 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2783 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2784 /* 0x800000L unused */ 2785 /* 0x1000000L unused */ 2786 /* 0x2000000L unused */ 2787 /* 0x4000000L unused */ 2788 /* 0x8000000L unused */ 2789 /* 0x10000000L unused */ 2790 /* 0x20000000L unused */ 2791 /* 0x40000000L unused */ 2792 2793 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2794 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2795 2796 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2797 PNG_FLAG_CRC_CRITICAL_IGNORE) 2798 2799 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2800 PNG_FLAG_CRC_CRITICAL_MASK) 2801 2802 /* save typing and make code easier to understand */ 2803 2804 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2805 abs((int)((c1).green) - (int)((c2).green)) + \ 2806 abs((int)((c1).blue) - (int)((c2).blue))) 2807 2808 /* Added to libpng-1.2.6 JB */ 2809 #define PNG_ROWBYTES(pixel_bits, width) \ 2810 ((pixel_bits) >= 8 ? \ 2811 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2812 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2813 2814 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2815 ideal-delta..ideal+delta. Each argument is evaluated twice. 2816 "ideal" and "delta" should be constants, normally simple 2817 integers, "value" a variable. Added to libpng-1.2.6 JB */ 2818 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2819 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2820 2821 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2822 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2823 /* place to hold the signature string for a PNG file. */ 2824 #ifdef PNG_USE_GLOBAL_ARRAYS 2825 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 2826 #else 2827 #endif 2828 #endif /* PNG_NO_EXTERN */ 2829 2830 /* Constant strings for known chunk types. If you need to add a chunk, 2831 * define the name here, and add an invocation of the macro in png.c and 2832 * wherever it's needed. 2833 */ 2834 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2835 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2836 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2837 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2838 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2839 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2840 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2841 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2842 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2843 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2844 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2845 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2846 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2847 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2848 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2849 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 2850 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 2851 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 2852 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 2853 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 2854 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 2855 2856 #ifdef PNG_USE_GLOBAL_ARRAYS 2857 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 2858 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 2859 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 2860 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 2861 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 2862 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 2863 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 2864 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 2865 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 2866 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 2867 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 2868 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 2869 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 2870 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 2871 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 2872 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 2873 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 2874 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 2875 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 2876 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 2877 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 2878 #endif /* PNG_USE_GLOBAL_ARRAYS */ 2879 2880 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2881 /* Initialize png_ptr struct for reading, and allocate any other memory. 2882 * (old interface - DEPRECATED - use png_create_read_struct instead). 2883 */ 2884 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 2885 #undef png_read_init 2886 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 2887 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2888 #endif 2889 2890 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 2891 png_const_charp user_png_ver, png_size_t png_struct_size)); 2892 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2893 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 2894 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2895 png_info_size)); 2896 #endif 2897 2898 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2899 /* Initialize png_ptr struct for writing, and allocate any other memory. 2900 * (old interface - DEPRECATED - use png_create_write_struct instead). 2901 */ 2902 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 2903 #undef png_write_init 2904 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 2905 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2906 #endif 2907 2908 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 2909 png_const_charp user_png_ver, png_size_t png_struct_size)); 2910 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 2911 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2912 png_info_size)); 2913 2914 /* Allocate memory for an internal libpng struct */ 2915 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 2916 2917 /* Free memory from internal libpng struct */ 2918 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 2919 2920 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 2921 malloc_fn, png_voidp mem_ptr)); 2922 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 2923 png_free_ptr free_fn, png_voidp mem_ptr)); 2924 2925 /* Free any memory that info_ptr points to and reset struct. */ 2926 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 2927 png_infop info_ptr)); 2928 2929 #ifndef PNG_1_0_X 2930 /* Function to allocate memory for zlib. */ 2931 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 2932 2933 /* Function to free memory for zlib */ 2934 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 2935 2936 #ifdef PNG_SIZE_T 2937 /* Function to convert a sizeof an item to png_sizeof item */ 2938 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 2939 #endif 2940 2941 /* Next four functions are used internally as callbacks. PNGAPI is required 2942 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ 2943 2944 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 2945 png_bytep data, png_size_t length)); 2946 2947 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2948 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 2949 png_bytep buffer, png_size_t length)); 2950 #endif 2951 2952 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 2953 png_bytep data, png_size_t length)); 2954 2955 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 2956 #if !defined(PNG_NO_STDIO) 2957 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 2958 #endif 2959 #endif 2960 #else /* PNG_1_0_X */ 2961 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2962 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 2963 png_bytep buffer, png_size_t length)); 2964 #endif 2965 #endif /* PNG_1_0_X */ 2966 2967 /* Reset the CRC variable */ 2968 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 2969 2970 /* Write the "data" buffer to whatever output you are using. */ 2971 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 2972 png_size_t length)); 2973 2974 /* Read data from whatever input you are using into the "data" buffer */ 2975 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 2976 png_size_t length)); 2977 2978 /* Read bytes into buf, and update png_ptr->crc */ 2979 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 2980 png_size_t length)); 2981 2982 /* Decompress data in a chunk that uses compression */ 2983 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 2984 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 2985 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, 2986 int comp_type, png_charp chunkdata, png_size_t chunklength, 2987 png_size_t prefix_length, png_size_t *data_length)); 2988 #endif 2989 2990 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 2991 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 2992 2993 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 2994 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 2995 2996 /* Calculate the CRC over a section of data. Note that we are only 2997 * passing a maximum of 64K on systems that have this as a memory limit, 2998 * since this is the maximum buffer size we can specify. 2999 */ 3000 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3001 png_size_t length)); 3002 3003 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3004 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 3005 #endif 3006 3007 /* simple function to write the signature */ 3008 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 3009 3010 /* write various chunks */ 3011 3012 /* Write the IHDR chunk, and update the png_struct with the necessary 3013 * information. 3014 */ 3015 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3016 png_uint_32 height, 3017 int bit_depth, int color_type, int compression_method, int filter_method, 3018 int interlace_method)); 3019 3020 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3021 png_uint_32 num_pal)); 3022 3023 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3024 png_size_t length)); 3025 3026 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 3027 3028 #if defined(PNG_WRITE_gAMA_SUPPORTED) 3029 #ifdef PNG_FLOATING_POINT_SUPPORTED 3030 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 3031 #endif 3032 #ifdef PNG_FIXED_POINT_SUPPORTED 3033 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 3034 file_gamma)); 3035 #endif 3036 #endif 3037 3038 #if defined(PNG_WRITE_sBIT_SUPPORTED) 3039 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3040 int color_type)); 3041 #endif 3042 3043 #if defined(PNG_WRITE_cHRM_SUPPORTED) 3044 #ifdef PNG_FLOATING_POINT_SUPPORTED 3045 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3046 double white_x, double white_y, 3047 double red_x, double red_y, double green_x, double green_y, 3048 double blue_x, double blue_y)); 3049 #endif 3050 #ifdef PNG_FIXED_POINT_SUPPORTED 3051 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3052 png_fixed_point int_white_x, png_fixed_point int_white_y, 3053 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3054 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3055 png_fixed_point int_blue_y)); 3056 #endif 3057 #endif 3058 3059 #if defined(PNG_WRITE_sRGB_SUPPORTED) 3060 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3061 int intent)); 3062 #endif 3063 3064 #if defined(PNG_WRITE_iCCP_SUPPORTED) 3065 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3066 png_charp name, int compression_type, 3067 png_charp profile, int proflen)); 3068 /* Note to maintainer: profile should be png_bytep */ 3069 #endif 3070 3071 #if defined(PNG_WRITE_sPLT_SUPPORTED) 3072 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3073 png_sPLT_tp palette)); 3074 #endif 3075 3076 #if defined(PNG_WRITE_tRNS_SUPPORTED) 3077 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3078 png_color_16p values, int number, int color_type)); 3079 #endif 3080 3081 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3082 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3083 png_color_16p values, int color_type)); 3084 #endif 3085 3086 #if defined(PNG_WRITE_hIST_SUPPORTED) 3087 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3088 int num_hist)); 3089 #endif 3090 3091 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3092 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3093 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3094 png_charp key, png_charpp new_key)); 3095 #endif 3096 3097 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3098 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3099 png_charp text, png_size_t text_len)); 3100 #endif 3101 3102 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3103 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3104 png_charp text, png_size_t text_len, int compression)); 3105 #endif 3106 3107 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3108 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3109 int compression, png_charp key, png_charp lang, png_charp lang_key, 3110 png_charp text)); 3111 #endif 3112 3113 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3114 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3115 png_infop info_ptr, png_textp text_ptr, int num_text)); 3116 #endif 3117 3118 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3119 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3120 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 3121 #endif 3122 3123 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3124 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3125 png_int_32 X0, png_int_32 X1, int type, int nparams, 3126 png_charp units, png_charpp params)); 3127 #endif 3128 3129 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3130 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3131 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3132 int unit_type)); 3133 #endif 3134 3135 #if defined(PNG_WRITE_tIME_SUPPORTED) 3136 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3137 png_timep mod_time)); 3138 #endif 3139 3140 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3141 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3142 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3143 int unit, double width, double height)); 3144 #else 3145 #ifdef PNG_FIXED_POINT_SUPPORTED 3146 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3147 int unit, png_charp width, png_charp height)); 3148 #endif 3149 #endif 3150 #endif 3151 3152 /* Called when finished processing a row of data */ 3153 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3154 3155 /* Internal use only. Called before first row of data */ 3156 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3157 3158 #if defined(PNG_READ_GAMMA_SUPPORTED) 3159 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3160 #endif 3161 3162 /* combine a row of data, dealing with alpha, etc. if requested */ 3163 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3164 int mask)); 3165 3166 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3167 /* expand an interlaced row */ 3168 /* OLD pre-1.0.9 interface: 3169 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3170 png_bytep row, int pass, png_uint_32 transformations)); 3171 */ 3172 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3173 #endif 3174 3175 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3176 3177 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3178 /* grab pixels out of a row for an interlaced pass */ 3179 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3180 png_bytep row, int pass)); 3181 #endif 3182 3183 /* unfilter a row */ 3184 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3185 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 3186 3187 /* Choose the best filter to use and filter the row data */ 3188 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3189 png_row_infop row_info)); 3190 3191 /* Write out the filtered row. */ 3192 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3193 png_bytep filtered_row)); 3194 /* finish a row while reading, dealing with interlacing passes, etc. */ 3195 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3196 3197 /* initialize the row buffers, etc. */ 3198 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3199 /* optional call to update the users info structure */ 3200 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3201 png_infop info_ptr)); 3202 3203 /* these are the functions that do the transformations */ 3204 #if defined(PNG_READ_FILLER_SUPPORTED) 3205 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3206 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3207 #endif 3208 3209 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3210 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3211 png_bytep row)); 3212 #endif 3213 3214 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3215 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3216 png_bytep row)); 3217 #endif 3218 3219 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3220 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3221 png_bytep row)); 3222 #endif 3223 3224 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3225 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3226 png_bytep row)); 3227 #endif 3228 3229 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3230 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3231 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3232 png_bytep row, png_uint_32 flags)); 3233 #endif 3234 3235 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3236 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3237 #endif 3238 3239 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3240 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3241 #endif 3242 3243 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3244 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3245 row_info, png_bytep row)); 3246 #endif 3247 3248 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3249 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3250 png_bytep row)); 3251 #endif 3252 3253 #if defined(PNG_READ_PACK_SUPPORTED) 3254 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3255 #endif 3256 3257 #if defined(PNG_READ_SHIFT_SUPPORTED) 3258 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3259 png_color_8p sig_bits)); 3260 #endif 3261 3262 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3263 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3264 #endif 3265 3266 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3267 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3268 #endif 3269 3270 #if defined(PNG_READ_DITHER_SUPPORTED) 3271 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3272 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3273 3274 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3275 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3276 png_colorp palette, int num_palette)); 3277 # endif 3278 #endif 3279 3280 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3281 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3282 #endif 3283 3284 #if defined(PNG_WRITE_PACK_SUPPORTED) 3285 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3286 png_bytep row, png_uint_32 bit_depth)); 3287 #endif 3288 3289 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3290 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3291 png_color_8p bit_depth)); 3292 #endif 3293 3294 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3295 #if defined(PNG_READ_GAMMA_SUPPORTED) 3296 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3297 png_color_16p trans_values, png_color_16p background, 3298 png_color_16p background_1, 3299 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3300 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3301 png_uint_16pp gamma_16_to_1, int gamma_shift)); 3302 #else 3303 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3304 png_color_16p trans_values, png_color_16p background)); 3305 #endif 3306 #endif 3307 3308 #if defined(PNG_READ_GAMMA_SUPPORTED) 3309 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3310 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3311 int gamma_shift)); 3312 #endif 3313 3314 #if defined(PNG_READ_EXPAND_SUPPORTED) 3315 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3316 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 3317 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3318 png_bytep row, png_color_16p trans_value)); 3319 #endif 3320 3321 /* The following decodes the appropriate chunks, and does error correction, 3322 * then calls the appropriate callback for the chunk if it is valid. 3323 */ 3324 3325 /* decode the IHDR chunk */ 3326 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3327 png_uint_32 length)); 3328 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3329 png_uint_32 length)); 3330 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3331 png_uint_32 length)); 3332 3333 #if defined(PNG_READ_bKGD_SUPPORTED) 3334 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3335 png_uint_32 length)); 3336 #endif 3337 3338 #if defined(PNG_READ_cHRM_SUPPORTED) 3339 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3340 png_uint_32 length)); 3341 #endif 3342 3343 #if defined(PNG_READ_gAMA_SUPPORTED) 3344 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3345 png_uint_32 length)); 3346 #endif 3347 3348 #if defined(PNG_READ_hIST_SUPPORTED) 3349 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3350 png_uint_32 length)); 3351 #endif 3352 3353 #if defined(PNG_READ_iCCP_SUPPORTED) 3354 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3355 png_uint_32 length)); 3356 #endif /* PNG_READ_iCCP_SUPPORTED */ 3357 3358 #if defined(PNG_READ_iTXt_SUPPORTED) 3359 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3360 png_uint_32 length)); 3361 #endif 3362 3363 #if defined(PNG_READ_oFFs_SUPPORTED) 3364 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3365 png_uint_32 length)); 3366 #endif 3367 3368 #if defined(PNG_READ_pCAL_SUPPORTED) 3369 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3370 png_uint_32 length)); 3371 #endif 3372 3373 #if defined(PNG_READ_pHYs_SUPPORTED) 3374 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3375 png_uint_32 length)); 3376 #endif 3377 3378 #if defined(PNG_READ_sBIT_SUPPORTED) 3379 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3380 png_uint_32 length)); 3381 #endif 3382 3383 #if defined(PNG_READ_sCAL_SUPPORTED) 3384 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3385 png_uint_32 length)); 3386 #endif 3387 3388 #if defined(PNG_READ_sPLT_SUPPORTED) 3389 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3390 png_uint_32 length)); 3391 #endif /* PNG_READ_sPLT_SUPPORTED */ 3392 3393 #if defined(PNG_READ_sRGB_SUPPORTED) 3394 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3395 png_uint_32 length)); 3396 #endif 3397 3398 #if defined(PNG_READ_tEXt_SUPPORTED) 3399 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3400 png_uint_32 length)); 3401 #endif 3402 3403 #if defined(PNG_READ_tIME_SUPPORTED) 3404 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3405 png_uint_32 length)); 3406 #endif 3407 3408 #if defined(PNG_READ_tRNS_SUPPORTED) 3409 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3410 png_uint_32 length)); 3411 #endif 3412 3413 #if defined(PNG_READ_zTXt_SUPPORTED) 3414 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3415 png_uint_32 length)); 3416 #endif 3417 3418 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3419 png_infop info_ptr, png_uint_32 length)); 3420 3421 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3422 png_bytep chunk_name)); 3423 3424 /* handle the transformations for reading and writing */ 3425 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3426 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3427 3428 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3429 3430 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3431 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3432 png_infop info_ptr)); 3433 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3434 png_infop info_ptr)); 3435 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3436 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3437 png_uint_32 length)); 3438 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3439 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3440 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3441 png_bytep buffer, png_size_t buffer_length)); 3442 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3443 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3444 png_bytep buffer, png_size_t buffer_length)); 3445 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3446 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3447 png_infop info_ptr, png_uint_32 length)); 3448 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3449 png_infop info_ptr)); 3450 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3451 png_infop info_ptr)); 3452 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3453 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3454 png_infop info_ptr)); 3455 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3456 png_infop info_ptr)); 3457 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3458 #if defined(PNG_READ_tEXt_SUPPORTED) 3459 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3460 png_infop info_ptr, png_uint_32 length)); 3461 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3462 png_infop info_ptr)); 3463 #endif 3464 #if defined(PNG_READ_zTXt_SUPPORTED) 3465 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3466 png_infop info_ptr, png_uint_32 length)); 3467 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3468 png_infop info_ptr)); 3469 #endif 3470 #if defined(PNG_READ_iTXt_SUPPORTED) 3471 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3472 png_infop info_ptr, png_uint_32 length)); 3473 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3474 png_infop info_ptr)); 3475 #endif 3476 3477 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3478 3479 #ifdef PNG_MNG_FEATURES_SUPPORTED 3480 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3481 png_bytep row)); 3482 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3483 png_bytep row)); 3484 #endif 3485 3486 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3487 #if defined(PNG_MMX_CODE_SUPPORTED) 3488 /* png.c */ /* PRIVATE */ 3489 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3490 #endif 3491 #endif 3492 3493 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3494 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3495 png_infop info_ptr)); 3496 3497 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3498 png_infop info_ptr)); 3499 3500 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3501 png_infop info_ptr)); 3502 3503 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3504 png_infop info_ptr)); 3505 3506 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3507 png_infop info_ptr)); 3508 3509 #if defined(PNG_pHYs_SUPPORTED) 3510 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3511 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3512 #endif /* PNG_pHYs_SUPPORTED */ 3513 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3514 3515 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3516 3517 #endif /* PNG_INTERNAL */ 3518 3519 #ifdef __cplusplus 3520 } 3521 #endif 3522 3523 #endif /* PNG_VERSION_INFO_ONLY */ 3524 /* do not put anything past this line */ 3525 #endif /* PNG_H */ 3526
