/src/FreeImage/Source/LibPNG/png.h
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1 2/* png.h - header file for PNG reference library 3 * 4 * libpng version 1.5.9 - February 18, 2012 5 * Copyright (c) 1998-2012 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * This code is released under the libpng license (See LICENSE, below) 10 * 11 * Authors and maintainers: 12 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 13 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 14 * libpng versions 0.97, January 1998, through 1.5.9 - February 18, 2012: Glenn 15 * See also "Contributing Authors", below. 16 * 17 * Note about libpng version numbers: 18 * 19 * Due to various miscommunications, unforeseen code incompatibilities 20 * and occasional factors outside the authors' control, version numbering 21 * on the library has not always been consistent and straightforward. 22 * The following table summarizes matters since version 0.89c, which was 23 * the first widely used release: 24 * 25 * source png.h png.h shared-lib 26 * version string int version 27 * ------- ------ ----- ---------- 28 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 29 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 30 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 31 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 32 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 33 * 0.97c 0.97 97 2.0.97 34 * 0.98 0.98 98 2.0.98 35 * 0.99 0.99 98 2.0.99 36 * 0.99a-m 0.99 99 2.0.99 37 * 1.00 1.00 100 2.1.0 [100 should be 10000] 38 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 39 * 1.0.1 png.h string is 10001 2.1.0 40 * 1.0.1a-e identical to the 10002 from here on, the shared library 41 * 1.0.2 source version) 10002 is 2.V where V is the source code 42 * 1.0.2a-b 10003 version, except as noted. 43 * 1.0.3 10003 44 * 1.0.3a-d 10004 45 * 1.0.4 10004 46 * 1.0.4a-f 10005 47 * 1.0.5 (+ 2 patches) 10005 48 * 1.0.5a-d 10006 49 * 1.0.5e-r 10100 (not source compatible) 50 * 1.0.5s-v 10006 (not binary compatible) 51 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 52 * 1.0.6d-f 10007 (still binary incompatible) 53 * 1.0.6g 10007 54 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 55 * 1.0.6i 10007 10.6i 56 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 57 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 58 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 59 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 60 * 1.0.7 1 10007 (still compatible) 61 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 62 * 1.0.8rc1 1 10008 2.1.0.8rc1 63 * 1.0.8 1 10008 2.1.0.8 64 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 65 * 1.0.9rc1 1 10009 2.1.0.9rc1 66 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 67 * 1.0.9rc2 1 10009 2.1.0.9rc2 68 * 1.0.9 1 10009 2.1.0.9 69 * 1.0.10beta1 1 10010 2.1.0.10beta1 70 * 1.0.10rc1 1 10010 2.1.0.10rc1 71 * 1.0.10 1 10010 2.1.0.10 72 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 73 * 1.0.11rc1 1 10011 2.1.0.11rc1 74 * 1.0.11 1 10011 2.1.0.11 75 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 76 * 1.0.12rc1 2 10012 2.1.0.12rc1 77 * 1.0.12 2 10012 2.1.0.12 78 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 79 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 80 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 81 * 1.2.0rc1 3 10200 3.1.2.0rc1 82 * 1.2.0 3 10200 3.1.2.0 83 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 84 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 85 * 1.2.1 3 10201 3.1.2.1 86 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 87 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 88 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 89 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 90 * 1.0.13 10 10013 10.so.0.1.0.13 91 * 1.2.2 12 10202 12.so.0.1.2.2 92 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 93 * 1.2.3 12 10203 12.so.0.1.2.3 94 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 95 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 96 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 97 * 1.0.14 10 10014 10.so.0.1.0.14 98 * 1.2.4 13 10204 12.so.0.1.2.4 99 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 100 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 101 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 102 * 1.0.15 10 10015 10.so.0.1.0.15 103 * 1.2.5 13 10205 12.so.0.1.2.5 104 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 105 * 1.0.16 10 10016 10.so.0.1.0.16 106 * 1.2.6 13 10206 12.so.0.1.2.6 107 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 108 * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 109 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 110 * 1.0.17 10 10017 12.so.0.1.0.17 111 * 1.2.7 13 10207 12.so.0.1.2.7 112 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 113 * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 114 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 115 * 1.0.18 10 10018 12.so.0.1.0.18 116 * 1.2.8 13 10208 12.so.0.1.2.8 117 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 118 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 119 * 1.2.9rc1 13 10209 12.so.0.9[.0] 120 * 1.2.9 13 10209 12.so.0.9[.0] 121 * 1.2.10beta1-7 13 10210 12.so.0.10[.0] 122 * 1.2.10rc1-2 13 10210 12.so.0.10[.0] 123 * 1.2.10 13 10210 12.so.0.10[.0] 124 * 1.4.0beta1-5 14 10400 14.so.0.0[.0] 125 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 126 * 1.4.0beta7-8 14 10400 14.so.0.0[.0] 127 * 1.2.11 13 10211 12.so.0.11[.0] 128 * 1.2.12 13 10212 12.so.0.12[.0] 129 * 1.4.0beta9-14 14 10400 14.so.0.0[.0] 130 * 1.2.13 13 10213 12.so.0.13[.0] 131 * 1.4.0beta15-36 14 10400 14.so.0.0[.0] 132 * 1.4.0beta37-87 14 10400 14.so.14.0[.0] 133 * 1.4.0rc01 14 10400 14.so.14.0[.0] 134 * 1.4.0beta88-109 14 10400 14.so.14.0[.0] 135 * 1.4.0rc02-08 14 10400 14.so.14.0[.0] 136 * 1.4.0 14 10400 14.so.14.0[.0] 137 * 1.4.1beta01-03 14 10401 14.so.14.1[.0] 138 * 1.4.1rc01 14 10401 14.so.14.1[.0] 139 * 1.4.1beta04-12 14 10401 14.so.14.1[.0] 140 * 1.4.1 14 10401 14.so.14.1[.0] 141 * 1.4.2 14 10402 14.so.14.2[.0] 142 * 1.4.3 14 10403 14.so.14.3[.0] 143 * 1.4.4 14 10404 14.so.14.4[.0] 144 * 1.5.0beta01-58 15 10500 15.so.15.0[.0] 145 * 1.5.0rc01-07 15 10500 15.so.15.0[.0] 146 * 1.5.0 15 10500 15.so.15.0[.0] 147 * 1.5.1beta01-11 15 10501 15.so.15.1[.0] 148 * 1.5.1rc01-02 15 10501 15.so.15.1[.0] 149 * 1.5.1 15 10501 15.so.15.1[.0] 150 * 1.5.2beta01-03 15 10502 15.so.15.2[.0] 151 * 1.5.2rc01-03 15 10502 15.so.15.2[.0] 152 * 1.5.2 15 10502 15.so.15.2[.0] 153 * 1.5.3beta01-10 15 10503 15.so.15.3[.0] 154 * 1.5.3rc01-02 15 10503 15.so.15.3[.0] 155 * 1.5.3beta11 15 10503 15.so.15.3[.0] 156 * 1.5.3 [omitted] 157 * 1.5.4beta01-08 15 10504 15.so.15.4[.0] 158 * 1.5.4rc01 15 10504 15.so.15.4[.0] 159 * 1.5.4 15 10504 15.so.15.4[.0] 160 * 1.5.5beta01-08 15 10505 15.so.15.5[.0] 161 * 1.5.5rc01 15 10505 15.so.15.5[.0] 162 * 1.5.5 15 10505 15.so.15.5[.0] 163 * 1.5.6beta01-07 15 10506 15.so.15.6[.0] 164 * 1.5.6rc01-03 15 10506 15.so.15.6[.0] 165 * 1.5.6 15 10506 15.so.15.6[.0] 166 * 1.5.7beta01-05 15 10507 15.so.15.7[.0] 167 * 1.5.7rc01-03 15 10507 15.so.15.7[.0] 168 * 1.5.7 15 10507 15.so.15.7[.0] 169 * 1.5.8beta01 15 10508 15.so.15.8[.0] 170 * 1.5.8rc01 15 10508 15.so.15.8[.0] 171 * 1.5.8 15 10508 15.so.15.8[.0] 172 * 1.5.9beta01-02 15 10509 15.so.15.9[.0] 173 * 1.5.9rc01 15 10509 15.so.15.9[.0] 174 * 1.5.9 15 10509 15.so.15.9[.0] 175 * 176 * Henceforth the source version will match the shared-library major 177 * and minor numbers; the shared-library major version number will be 178 * used for changes in backward compatibility, as it is intended. The 179 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 180 * for applications, is an unsigned integer of the form xyyzz corresponding 181 * to the source version x.y.z (leading zeros in y and z). Beta versions 182 * were given the previous public release number plus a letter, until 183 * version 1.0.6j; from then on they were given the upcoming public 184 * release number plus "betaNN" or "rcN". 185 * 186 * Binary incompatibility exists only when applications make direct access 187 * to the info_ptr or png_ptr members through png.h, and the compiled 188 * application is loaded with a different version of the library. 189 * 190 * DLLNUM will change each time there are forward or backward changes 191 * in binary compatibility (e.g., when a new feature is added). 192 * 193 * See libpng-manual.txt or libpng.3 for more information. The PNG 194 * specification is available as a W3C Recommendation and as an ISO 195 * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ 196 */ 197 198/* 199 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 200 * 201 * If you modify libpng you may insert additional notices immediately following 202 * this sentence. 203 * 204 * This code is released under the libpng license. 205 * 206 * libpng versions 1.2.6, August 15, 2004, through 1.5.9, February 18, 2012, are 207 * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are 208 * distributed according to the same disclaimer and license as libpng-1.2.5 209 * with the following individual added to the list of Contributing Authors: 210 * 211 * Cosmin Truta 212 * 213 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 214 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 215 * distributed according to the same disclaimer and license as libpng-1.0.6 216 * with the following individuals added to the list of Contributing Authors: 217 * 218 * Simon-Pierre Cadieux 219 * Eric S. Raymond 220 * Gilles Vollant 221 * 222 * and with the following additions to the disclaimer: 223 * 224 * There is no warranty against interference with your enjoyment of the 225 * library or against infringement. There is no warranty that our 226 * efforts or the library will fulfill any of your particular purposes 227 * or needs. This library is provided with all faults, and the entire 228 * risk of satisfactory quality, performance, accuracy, and effort is with 229 * the user. 230 * 231 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 232 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 233 * distributed according to the same disclaimer and license as libpng-0.96, 234 * with the following individuals added to the list of Contributing Authors: 235 * 236 * Tom Lane 237 * Glenn Randers-Pehrson 238 * Willem van Schaik 239 * 240 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 241 * Copyright (c) 1996, 1997 Andreas Dilger 242 * Distributed according to the same disclaimer and license as libpng-0.88, 243 * with the following individuals added to the list of Contributing Authors: 244 * 245 * John Bowler 246 * Kevin Bracey 247 * Sam Bushell 248 * Magnus Holmgren 249 * Greg Roelofs 250 * Tom Tanner 251 * 252 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 253 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 254 * 255 * For the purposes of this copyright and license, "Contributing Authors" 256 * is defined as the following set of individuals: 257 * 258 * Andreas Dilger 259 * Dave Martindale 260 * Guy Eric Schalnat 261 * Paul Schmidt 262 * Tim Wegner 263 * 264 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 265 * and Group 42, Inc. disclaim all warranties, expressed or implied, 266 * including, without limitation, the warranties of merchantability and of 267 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 268 * assume no liability for direct, indirect, incidental, special, exemplary, 269 * or consequential damages, which may result from the use of the PNG 270 * Reference Library, even if advised of the possibility of such damage. 271 * 272 * Permission is hereby granted to use, copy, modify, and distribute this 273 * source code, or portions hereof, for any purpose, without fee, subject 274 * to the following restrictions: 275 * 276 * 1. The origin of this source code must not be misrepresented. 277 * 278 * 2. Altered versions must be plainly marked as such and must not 279 * be misrepresented as being the original source. 280 * 281 * 3. This Copyright notice may not be removed or altered from 282 * any source or altered source distribution. 283 * 284 * The Contributing Authors and Group 42, Inc. specifically permit, without 285 * fee, and encourage the use of this source code as a component to 286 * supporting the PNG file format in commercial products. If you use this 287 * source code in a product, acknowledgment is not required but would be 288 * appreciated. 289 */ 290 291/* 292 * A "png_get_copyright" function is available, for convenient use in "about" 293 * boxes and the like: 294 * 295 * printf("%s", png_get_copyright(NULL)); 296 * 297 * Also, the PNG logo (in PNG format, of course) is supplied in the 298 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 299 */ 300 301/* 302 * Libpng is OSI Certified Open Source Software. OSI Certified is a 303 * certification mark of the Open Source Initiative. 304 */ 305 306/* 307 * The contributing authors would like to thank all those who helped 308 * with testing, bug fixes, and patience. This wouldn't have been 309 * possible without all of you. 310 * 311 * Thanks to Frank J. T. Wojcik for helping with the documentation. 312 */ 313 314/* 315 * Y2K compliance in libpng: 316 * ========================= 317 * 318 * February 18, 2012 319 * 320 * Since the PNG Development group is an ad-hoc body, we can't make 321 * an official declaration. 322 * 323 * This is your unofficial assurance that libpng from version 0.71 and 324 * upward through 1.5.9 are Y2K compliant. It is my belief that 325 * earlier versions were also Y2K compliant. 326 * 327 * Libpng only has two year fields. One is a 2-byte unsigned integer 328 * that will hold years up to 65535. The other holds the date in text 329 * format, and will hold years up to 9999. 330 * 331 * The integer is 332 * "png_uint_16 year" in png_time_struct. 333 * 334 * The string is 335 * "png_char time_buffer" in png_struct 336 * 337 * There are seven time-related functions: 338 * png.c: png_convert_to_rfc_1123() in png.c 339 * (formerly png_convert_to_rfc_1152() in error) 340 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 341 * png_convert_from_time_t() in pngwrite.c 342 * png_get_tIME() in pngget.c 343 * png_handle_tIME() in pngrutil.c, called in pngread.c 344 * png_set_tIME() in pngset.c 345 * png_write_tIME() in pngwutil.c, called in pngwrite.c 346 * 347 * All handle dates properly in a Y2K environment. The 348 * png_convert_from_time_t() function calls gmtime() to convert from system 349 * clock time, which returns (year - 1900), which we properly convert to 350 * the full 4-digit year. There is a possibility that applications using 351 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 352 * function, or that they are incorrectly passing only a 2-digit year 353 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 354 * but this is not under our control. The libpng documentation has always 355 * stated that it works with 4-digit years, and the APIs have been 356 * documented as such. 357 * 358 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 359 * integer to hold the year, and can hold years as large as 65535. 360 * 361 * zlib, upon which libpng depends, is also Y2K compliant. It contains 362 * no date-related code. 363 * 364 * Glenn Randers-Pehrson 365 * libpng maintainer 366 * PNG Development Group 367 */ 368 369#ifndef PNG_H 370#define PNG_H 371 372/* This is not the place to learn how to use libpng. The file libpng-manual.txt 373 * describes how to use libpng, and the file example.c summarizes it 374 * with some code on which to build. This file is useful for looking 375 * at the actual function definitions and structure components. 376 * 377 * If you just need to read a PNG file and don't want to read the documentation 378 * skip to the end of this file and read the section entitled 'simplified API'. 379 */ 380 381/* Version information for png.h - this should match the version in png.c */ 382#define PNG_LIBPNG_VER_STRING "1.5.9" 383#define PNG_HEADER_VERSION_STRING \ 384 " libpng version 1.5.9 - February 18, 2012\n" 385 386#define PNG_LIBPNG_VER_SONUM 15 387#define PNG_LIBPNG_VER_DLLNUM 15 388 389/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 390#define PNG_LIBPNG_VER_MAJOR 1 391#define PNG_LIBPNG_VER_MINOR 5 392#define PNG_LIBPNG_VER_RELEASE 9 393 394/* This should match the numeric part of the final component of 395 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 396 */ 397 398#define PNG_LIBPNG_VER_BUILD 0 399 400/* Release Status */ 401#define PNG_LIBPNG_BUILD_ALPHA 1 402#define PNG_LIBPNG_BUILD_BETA 2 403#define PNG_LIBPNG_BUILD_RC 3 404#define PNG_LIBPNG_BUILD_STABLE 4 405#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 406 407/* Release-Specific Flags */ 408#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 409 PNG_LIBPNG_BUILD_STABLE only */ 410#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 411 PNG_LIBPNG_BUILD_SPECIAL */ 412#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 413 PNG_LIBPNG_BUILD_PRIVATE */ 414 415#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA 416 417/* Careful here. At one time, Guy wanted to use 082, but that would be octal. 418 * We must not include leading zeros. 419 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 420 * version 1.0.0 was mis-numbered 100 instead of 10000). From 421 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 422 */ 423#define PNG_LIBPNG_VER 10509 /* 1.5.9 */ 424 425/* Library configuration: these options cannot be changed after 426 * the library has been built. 427 */ 428#ifndef PNGLCONF_H 429 /* If pnglibconf.h is missing, you can 430 * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h 431 */ 432# include "pnglibconf.h" 433#endif 434 435#ifndef PNG_VERSION_INFO_ONLY 436# ifndef PNG_BUILDING_SYMBOL_TABLE 437 /* 438 * Standard header files (not needed for the version info or while 439 * building symbol table -- see scripts/pnglibconf.dfa) 440 */ 441# ifdef PNG_SETJMP_SUPPORTED 442# include <setjmp.h> 443# endif 444 445 /* Need the time information for converting tIME chunks, it 446 * defines struct tm: 447 */ 448# ifdef PNG_CONVERT_tIME_SUPPORTED 449 /* "time.h" functions are not supported on all operating systems */ 450# include <time.h> 451# endif 452# endif 453 454/* Machine specific configuration. */ 455# include "pngconf.h" 456#endif 457 458/* 459 * Added at libpng-1.2.8 460 * 461 * Ref MSDN: Private as priority over Special 462 * VS_FF_PRIVATEBUILD File *was not* built using standard release 463 * procedures. If this value is given, the StringFileInfo block must 464 * contain a PrivateBuild string. 465 * 466 * VS_FF_SPECIALBUILD File *was* built by the original company using 467 * standard release procedures but is a variation of the standard 468 * file of the same version number. If this value is given, the 469 * StringFileInfo block must contain a SpecialBuild string. 470 */ 471 472#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ 473# define PNG_LIBPNG_BUILD_TYPE \ 474 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 475#else 476# ifdef PNG_LIBPNG_SPECIALBUILD 477# define PNG_LIBPNG_BUILD_TYPE \ 478 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 479# else 480# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 481# endif 482#endif 483 484#ifndef PNG_VERSION_INFO_ONLY 485 486/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 487#ifdef __cplusplus 488extern "C" { 489#endif /* __cplusplus */ 490 491/* Version information for C files, stored in png.c. This had better match 492 * the version above. 493 */ 494#define png_libpng_ver png_get_header_ver(NULL) 495 496/* This file is arranged in several sections: 497 * 498 * 1. Any configuration options that can be specified by for the application 499 * code when it is built. (Build time configuration is in pnglibconf.h) 500 * 2. Type definitions (base types are defined in pngconf.h), structure 501 * definitions. 502 * 3. Exported library functions. 503 * 504 * The library source code has additional files (principally pngpriv.h) that 505 * allow configuration of the library. 506 */ 507/* Section 1: run time configuration 508 * See pnglibconf.h for build time configuration 509 * 510 * Run time configuration allows the application to choose between 511 * implementations of certain arithmetic APIs. The default is set 512 * at build time and recorded in pnglibconf.h, but it is safe to 513 * override these (and only these) settings. Note that this won't 514 * change what the library does, only application code, and the 515 * settings can (and probably should) be made on a per-file basis 516 * by setting the #defines before including png.h 517 * 518 * Use macros to read integers from PNG data or use the exported 519 * functions? 520 * PNG_USE_READ_MACROS: use the macros (see below) Note that 521 * the macros evaluate their argument multiple times. 522 * PNG_NO_USE_READ_MACROS: call the relevant library function. 523 * 524 * Use the alternative algorithm for compositing alpha samples that 525 * does not use division? 526 * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' 527 * algorithm. 528 * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. 529 * 530 * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is 531 * false? 532 * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error 533 * APIs to png_warning. 534 * Otherwise the calls are mapped to png_error. 535 */ 536 537/* Section 2: type definitions, including structures and compile time 538 * constants. 539 * See pngconf.h for base types that vary by machine/system 540 */ 541 542/* This triggers a compiler error in png.c, if png.c and png.h 543 * do not agree upon the version number. 544 */ 545typedef char* png_libpng_version_1_5_9; 546 547/* Three color definitions. The order of the red, green, and blue, (and the 548 * exact size) is not important, although the size of the fields need to 549 * be png_byte or png_uint_16 (as defined below). 550 */ 551typedef struct png_color_struct 552{ 553 png_byte red; 554 png_byte green; 555 png_byte blue; 556} png_color; 557typedef png_color FAR * png_colorp; 558typedef PNG_CONST png_color FAR * png_const_colorp; 559typedef png_color FAR * FAR * png_colorpp; 560 561typedef struct png_color_16_struct 562{ 563 png_byte index; /* used for palette files */ 564 png_uint_16 red; /* for use in red green blue files */ 565 png_uint_16 green; 566 png_uint_16 blue; 567 png_uint_16 gray; /* for use in grayscale files */ 568} png_color_16; 569typedef png_color_16 FAR * png_color_16p; 570typedef PNG_CONST png_color_16 FAR * png_const_color_16p; 571typedef png_color_16 FAR * FAR * png_color_16pp; 572 573typedef struct png_color_8_struct 574{ 575 png_byte red; /* for use in red green blue files */ 576 png_byte green; 577 png_byte blue; 578 png_byte gray; /* for use in grayscale files */ 579 png_byte alpha; /* for alpha channel files */ 580} png_color_8; 581typedef png_color_8 FAR * png_color_8p; 582typedef PNG_CONST png_color_8 FAR * png_const_color_8p; 583typedef png_color_8 FAR * FAR * png_color_8pp; 584 585/* 586 * The following two structures are used for the in-core representation 587 * of sPLT chunks. 588 */ 589typedef struct png_sPLT_entry_struct 590{ 591 png_uint_16 red; 592 png_uint_16 green; 593 png_uint_16 blue; 594 png_uint_16 alpha; 595 png_uint_16 frequency; 596} png_sPLT_entry; 597typedef png_sPLT_entry FAR * png_sPLT_entryp; 598typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp; 599typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 600 601/* When the depth of the sPLT palette is 8 bits, the color and alpha samples 602 * occupy the LSB of their respective members, and the MSB of each member 603 * is zero-filled. The frequency member always occupies the full 16 bits. 604 */ 605 606typedef struct png_sPLT_struct 607{ 608 png_charp name; /* palette name */ 609 png_byte depth; /* depth of palette samples */ 610 png_sPLT_entryp entries; /* palette entries */ 611 png_int_32 nentries; /* number of palette entries */ 612} png_sPLT_t; 613typedef png_sPLT_t FAR * png_sPLT_tp; 614typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; 615typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 616 617#ifdef PNG_TEXT_SUPPORTED 618/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 619 * and whether that contents is compressed or not. The "key" field 620 * points to a regular zero-terminated C string. The "text" fields can be a 621 * regular C string, an empty string, or a NULL pointer. 622 * However, the structure returned by png_get_text() will always contain 623 * the "text" field as a regular zero-terminated C string (possibly 624 * empty), never a NULL pointer, so it can be safely used in printf() and 625 * other string-handling functions. Note that the "itxt_length", "lang", and 626 * "lang_key" members of the structure only exist when the library is built 627 * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by 628 * default without iTXt support. Also note that when iTXt *is* supported, 629 * the "lang" and "lang_key" fields contain NULL pointers when the 630 * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or 631 * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the 632 * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" 633 * which is always 0 or 1, or its "compression method" which is always 0. 634 */ 635typedef struct png_text_struct 636{ 637 int compression; /* compression value: 638 -1: tEXt, none 639 0: zTXt, deflate 640 1: iTXt, none 641 2: iTXt, deflate */ 642 png_charp key; /* keyword, 1-79 character description of "text" */ 643 png_charp text; /* comment, may be an empty string (ie "") 644 or a NULL pointer */ 645 png_size_t text_length; /* length of the text string */ 646 png_size_t itxt_length; /* length of the itxt string */ 647 png_charp lang; /* language code, 0-79 characters 648 or a NULL pointer */ 649 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 650 chars or a NULL pointer */ 651} png_text; 652typedef png_text FAR * png_textp; 653typedef PNG_CONST png_text FAR * png_const_textp; 654typedef png_text FAR * FAR * png_textpp; 655#endif 656 657/* Supported compression types for text in PNG files (tEXt, and zTXt). 658 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 659#define PNG_TEXT_COMPRESSION_NONE_WR -3 660#define PNG_TEXT_COMPRESSION_zTXt_WR -2 661#define PNG_TEXT_COMPRESSION_NONE -1 662#define PNG_TEXT_COMPRESSION_zTXt 0 663#define PNG_ITXT_COMPRESSION_NONE 1 664#define PNG_ITXT_COMPRESSION_zTXt 2 665#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 666 667/* png_time is a way to hold the time in an machine independent way. 668 * Two conversions are provided, both from time_t and struct tm. There 669 * is no portable way to convert to either of these structures, as far 670 * as I know. If you know of a portable way, send it to me. As a side 671 * note - PNG has always been Year 2000 compliant! 672 */ 673typedef struct png_time_struct 674{ 675 png_uint_16 year; /* full year, as in, 1995 */ 676 png_byte month; /* month of year, 1 - 12 */ 677 png_byte day; /* day of month, 1 - 31 */ 678 png_byte hour; /* hour of day, 0 - 23 */ 679 png_byte minute; /* minute of hour, 0 - 59 */ 680 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 681} png_time; 682typedef png_time FAR * png_timep; 683typedef PNG_CONST png_time FAR * png_const_timep; 684typedef png_time FAR * FAR * png_timepp; 685 686#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 687 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 688/* png_unknown_chunk is a structure to hold queued chunks for which there is 689 * no specific support. The idea is that we can use this to queue 690 * up private chunks for output even though the library doesn't actually 691 * know about their semantics. 692 */ 693typedef struct png_unknown_chunk_t 694{ 695 png_byte name[5]; 696 png_byte *data; 697 png_size_t size; 698 699 /* libpng-using applications should NOT directly modify this byte. */ 700 png_byte location; /* mode of operation at read time */ 701} 702 703 704png_unknown_chunk; 705typedef png_unknown_chunk FAR * png_unknown_chunkp; 706typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; 707typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 708#endif 709 710/* Values for the unknown chunk location byte */ 711 712#define PNG_HAVE_IHDR 0x01 713#define PNG_HAVE_PLTE 0x02 714#define PNG_AFTER_IDAT 0x08 715 716/* The complete definition of png_info has, as of libpng-1.5.0, 717 * been moved into a separate header file that is not accessible to 718 * applications. Read libpng-manual.txt or libpng.3 for more info. 719 */ 720typedef struct png_info_def png_info; 721typedef png_info FAR * png_infop; 722typedef PNG_CONST png_info FAR * png_const_infop; 723typedef png_info FAR * FAR * png_infopp; 724 725/* Maximum positive integer used in PNG is (2^31)-1 */ 726#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 727#define PNG_UINT_32_MAX ((png_uint_32)(-1)) 728#define PNG_SIZE_MAX ((png_size_t)(-1)) 729 730/* These are constants for fixed point values encoded in the 731 * PNG specification manner (x100000) 732 */ 733#define PNG_FP_1 100000 734#define PNG_FP_HALF 50000 735#define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) 736#define PNG_FP_MIN (-PNG_FP_MAX) 737 738/* These describe the color_type field in png_info. */ 739/* color type masks */ 740#define PNG_COLOR_MASK_PALETTE 1 741#define PNG_COLOR_MASK_COLOR 2 742#define PNG_COLOR_MASK_ALPHA 4 743 744/* color types. Note that not all combinations are legal */ 745#define PNG_COLOR_TYPE_GRAY 0 746#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 747#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 748#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 749#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 750/* aliases */ 751#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 752#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 753 754/* This is for compression type. PNG 1.0-1.2 only define the single type. */ 755#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 756#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 757 758/* This is for filter type. PNG 1.0-1.2 only define the single type. */ 759#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 760#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 761#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 762 763/* These are for the interlacing type. These values should NOT be changed. */ 764#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 765#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 766#define PNG_INTERLACE_LAST 2 /* Not a valid value */ 767 768/* These are for the oFFs chunk. These values should NOT be changed. */ 769#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 770#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 771#define PNG_OFFSET_LAST 2 /* Not a valid value */ 772 773/* These are for the pCAL chunk. These values should NOT be changed. */ 774#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 775#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 776#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 777#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 778#define PNG_EQUATION_LAST 4 /* Not a valid value */ 779 780/* These are for the sCAL chunk. These values should NOT be changed. */ 781#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 782#define PNG_SCALE_METER 1 /* meters per pixel */ 783#define PNG_SCALE_RADIAN 2 /* radians per pixel */ 784#define PNG_SCALE_LAST 3 /* Not a valid value */ 785 786/* These are for the pHYs chunk. These values should NOT be changed. */ 787#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 788#define PNG_RESOLUTION_METER 1 /* pixels/meter */ 789#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 790 791/* These are for the sRGB chunk. These values should NOT be changed. */ 792#define PNG_sRGB_INTENT_PERCEPTUAL 0 793#define PNG_sRGB_INTENT_RELATIVE 1 794#define PNG_sRGB_INTENT_SATURATION 2 795#define PNG_sRGB_INTENT_ABSOLUTE 3 796#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 797 798/* This is for text chunks */ 799#define PNG_KEYWORD_MAX_LENGTH 79 800 801/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 802#define PNG_MAX_PALETTE_LENGTH 256 803 804/* These determine if an ancillary chunk's data has been successfully read 805 * from the PNG header, or if the application has filled in the corresponding 806 * data in the info_struct to be written into the output file. The values 807 * of the PNG_INFO_<chunk> defines should NOT be changed. 808 */ 809#define PNG_INFO_gAMA 0x0001 810#define PNG_INFO_sBIT 0x0002 811#define PNG_INFO_cHRM 0x0004 812#define PNG_INFO_PLTE 0x0008 813#define PNG_INFO_tRNS 0x0010 814#define PNG_INFO_bKGD 0x0020 815#define PNG_INFO_hIST 0x0040 816#define PNG_INFO_pHYs 0x0080 817#define PNG_INFO_oFFs 0x0100 818#define PNG_INFO_tIME 0x0200 819#define PNG_INFO_pCAL 0x0400 820#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 821#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 822#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 823#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 824#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ 825 826/* This is used for the transformation routines, as some of them 827 * change these values for the row. It also should enable using 828 * the routines for other purposes. 829 */ 830typedef struct png_row_info_struct 831{ 832 png_uint_32 width; /* width of row */ 833 png_size_t rowbytes; /* number of bytes in row */ 834 png_byte color_type; /* color type of row */ 835 png_byte bit_depth; /* bit depth of row */ 836 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 837 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 838} png_row_info; 839 840typedef png_row_info FAR * png_row_infop; 841typedef png_row_info FAR * FAR * png_row_infopp; 842 843/* The complete definition of png_struct has, as of libpng-1.5.0, 844 * been moved into a separate header file that is not accessible to 845 * applications. Read libpng-manual.txt or libpng.3 for more info. 846 */ 847typedef struct png_struct_def png_struct; 848typedef PNG_CONST png_struct FAR * png_const_structp; 849typedef png_struct FAR * png_structp; 850 851/* These are the function types for the I/O functions and for the functions 852 * that allow the user to override the default I/O functions with his or her 853 * own. The png_error_ptr type should match that of user-supplied warning 854 * and error functions, while the png_rw_ptr type should match that of the 855 * user read/write data functions. Note that the 'write' function must not 856 * modify the buffer it is passed. The 'read' function, on the other hand, is 857 * expected to return the read data in the buffer. 858 */ 859typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); 860typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); 861typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); 862typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, 863 int)); 864typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, 865 int)); 866 867#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 868typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); 869typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); 870 871/* The following callback receives png_uint_32 row_number, int pass for the 872 * png_bytep data of the row. When transforming an interlaced image the 873 * row number is the row number within the sub-image of the interlace pass, so 874 * the value will increase to the height of the sub-image (not the full image) 875 * then reset to 0 for the next pass. 876 * 877 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to 878 * find the output pixel (x,y) given an interlaced sub-image pixel 879 * (row,col,pass). (See below for these macros.) 880 */ 881typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, 882 png_uint_32, int)); 883#endif 884 885#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 886 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 887typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, 888 png_bytep)); 889#endif 890 891#ifdef PNG_USER_CHUNKS_SUPPORTED 892typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, 893 png_unknown_chunkp)); 894#endif 895#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 896typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); 897#endif 898 899#ifdef PNG_SETJMP_SUPPORTED 900/* This must match the function definition in <setjmp.h>, and the application 901 * must include this before png.h to obtain the definition of jmp_buf. The 902 * function is required to be PNG_NORETURN, but this is not checked. If the 903 * function does return the application will crash via an abort() or similar 904 * system level call. 905 * 906 * If you get a warning here while building the library you may need to make 907 * changes to ensure that pnglibconf.h records the calling convention used by 908 * your compiler. This may be very difficult - try using a different compiler 909 * to build the library! 910 */ 911PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); 912#endif 913 914/* Transform masks for the high-level interface */ 915#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 916#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 917#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 918#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 919#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 920#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 921#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 922#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 923#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 924#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 925#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 926#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 927#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ 928/* Added to libpng-1.2.34 */ 929#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER 930#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 931/* Added to libpng-1.4.0 */ 932#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 933/* Added to libpng-1.5.4 */ 934#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ 935#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ 936 937/* Flags for MNG supported features */ 938#define PNG_FLAG_MNG_EMPTY_PLTE 0x01 939#define PNG_FLAG_MNG_FILTER_64 0x04 940#define PNG_ALL_MNG_FEATURES 0x05 941 942/* NOTE: prior to 1.5 these functions had no 'API' style declaration, 943 * this allowed the zlib default functions to be used on Windows 944 * platforms. In 1.5 the zlib default malloc (which just calls malloc and 945 * ignores the first argument) should be completely compatible with the 946 * following. 947 */ 948typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, 949 png_alloc_size_t)); 950typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); 951 952typedef png_struct FAR * FAR * png_structpp; 953 954/* Section 3: exported functions 955 * Here are the function definitions most commonly used. This is not 956 * the place to find out how to use libpng. See libpng-manual.txt for the 957 * full explanation, see example.c for the summary. This just provides 958 * a simple one line description of the use of each function. 959 * 960 * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in 961 * pngconf.h and in the *.dfn files in the scripts directory. 962 * 963 * PNG_EXPORT(ordinal, type, name, (args)); 964 * 965 * ordinal: ordinal that is used while building 966 * *.def files. The ordinal value is only 967 * relevant when preprocessing png.h with 968 * the *.dfn files for building symbol table 969 * entries, and are removed by pngconf.h. 970 * type: return type of the function 971 * name: function name 972 * args: function arguments, with types 973 * 974 * When we wish to append attributes to a function prototype we use 975 * the PNG_EXPORTA() macro instead. 976 * 977 * PNG_EXPORTA(ordinal, type, name, (args), attributes); 978 * 979 * ordinal, type, name, and args: same as in PNG_EXPORT(). 980 * attributes: function attributes 981 */ 982 983/* Returns the version number of the library */ 984PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); 985 986/* Tell lib we have already handled the first <num_bytes> magic bytes. 987 * Handling more than 8 bytes from the beginning of the file is an error. 988 */ 989PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); 990 991/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 992 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 993 * signature, and non-zero otherwise. Having num_to_check == 0 or 994 * start > 7 will always fail (ie return non-zero). 995 */ 996PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, 997 png_size_t num_to_check)); 998 999/* Simple signature checking function. This is the same as calling 1000 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1001 */ 1002#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) 1003 1004/* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1005PNG_EXPORTA(4, png_structp, png_create_read_struct, 1006 (png_const_charp user_png_ver, png_voidp error_ptr, 1007 png_error_ptr error_fn, png_error_ptr warn_fn), 1008 PNG_ALLOCATED); 1009 1010/* Allocate and initialize png_ptr struct for writing, and any other memory */ 1011PNG_EXPORTA(5, png_structp, png_create_write_struct, 1012 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1013 png_error_ptr warn_fn), 1014 PNG_ALLOCATED); 1015 1016PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, 1017 (png_const_structp png_ptr)); 1018 1019PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, 1020 png_size_t size)); 1021 1022/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp 1023 * match up. 1024 */ 1025#ifdef PNG_SETJMP_SUPPORTED 1026/* This function returns the jmp_buf built in to *png_ptr. It must be 1027 * supplied with an appropriate 'longjmp' function to use on that jmp_buf 1028 * unless the default error function is overridden in which case NULL is 1029 * acceptable. The size of the jmp_buf is checked against the actual size 1030 * allocated by the library - the call will return NULL on a mismatch 1031 * indicating an ABI mismatch. 1032 */ 1033PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, 1034 png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); 1035# define png_jmpbuf(png_ptr) \ 1036 (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) 1037#else 1038# define png_jmpbuf(png_ptr) \ 1039 (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) 1040#endif 1041/* This function should be used by libpng applications in place of 1042 * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it 1043 * will use it; otherwise it will call PNG_ABORT(). This function was 1044 * added in libpng-1.5.0. 1045 */ 1046PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val), 1047 PNG_NORETURN); 1048 1049#ifdef PNG_READ_SUPPORTED 1050/* Reset the compression stream */ 1051PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); 1052#endif 1053 1054/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1055#ifdef PNG_USER_MEM_SUPPORTED 1056PNG_EXPORTA(11, png_structp, png_create_read_struct_2, 1057 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1058 png_error_ptr warn_fn, 1059 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), 1060 PNG_ALLOCATED); 1061PNG_EXPORTA(12, png_structp, png_create_write_struct_2, 1062 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, 1063 png_error_ptr warn_fn, 1064 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), 1065 PNG_ALLOCATED); 1066#endif 1067 1068/* Write the PNG file signature. */ 1069PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr)); 1070 1071/* Write a PNG chunk - size, type, (optional) data, CRC. */ 1072PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep 1073 chunk_name, png_const_bytep data, png_size_t length)); 1074 1075/* Write the start of a PNG chunk - length and chunk name. */ 1076PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, 1077 png_const_bytep chunk_name, png_uint_32 length)); 1078 1079/* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1080PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, 1081 png_const_bytep data, png_size_t length)); 1082 1083/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1084PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); 1085 1086/* Allocate and initialize the info structure */ 1087PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), 1088 PNG_ALLOCATED); 1089 1090PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, 1091 png_size_t png_info_struct_size)); 1092 1093/* Writes all the PNG information before the image. */ 1094PNG_EXPORT(20, void, png_write_info_before_PLTE, 1095 (png_structp png_ptr, png_infop info_ptr)); 1096PNG_EXPORT(21, void, png_write_info, 1097 (png_structp png_ptr, png_infop info_ptr)); 1098 1099#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1100/* Read the information before the actual image data. */ 1101PNG_EXPORT(22, void, png_read_info, 1102 (png_structp png_ptr, png_infop info_ptr)); 1103#endif 1104 1105#ifdef PNG_TIME_RFC1123_SUPPORTED 1106PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, 1107 (png_structp png_ptr, 1108 png_const_timep ptime)); 1109#endif 1110 1111#ifdef PNG_CONVERT_tIME_SUPPORTED 1112/* Convert from a struct tm to png_time */ 1113PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, 1114 PNG_CONST struct tm FAR * ttime)); 1115 1116/* Convert from time_t to png_time. Uses gmtime() */ 1117PNG_EXPORT(25, void, png_convert_from_time_t, 1118 (png_timep ptime, time_t ttime)); 1119#endif /* PNG_CONVERT_tIME_SUPPORTED */ 1120 1121#ifdef PNG_READ_EXPAND_SUPPORTED 1122/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1123PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr)); 1124PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr)); 1125PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); 1126PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); 1127#endif 1128 1129#ifdef PNG_READ_EXPAND_16_SUPPORTED 1130/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion 1131 * of a tRNS chunk if present. 1132 */ 1133PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr)); 1134#endif 1135 1136#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1137/* Use blue, green, red order for pixels. */ 1138PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); 1139#endif 1140 1141#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1142/* Expand the grayscale to 24-bit RGB if necessary. */ 1143PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); 1144#endif 1145 1146#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1147/* Reduce RGB to grayscale. */ 1148#define PNG_ERROR_ACTION_NONE 1 1149#define PNG_ERROR_ACTION_WARN 2 1150#define PNG_ERROR_ACTION_ERROR 3 1151#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ 1152 1153PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, 1154 int error_action, double red, double green)); 1155PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, 1156 int error_action, png_fixed_point red, png_fixed_point green)); 1157 1158PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp 1159 png_ptr)); 1160#endif 1161 1162#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED 1163PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, 1164 png_colorp palette)); 1165#endif 1166 1167#ifdef PNG_READ_ALPHA_MODE_SUPPORTED 1168/* How the alpha channel is interpreted - this affects how the color channels of 1169 * a PNG file are returned when an alpha channel, or tRNS chunk in a palette 1170 * file, is present. 1171 * 1172 * This has no effect on the …
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