1 2 /* png.h - header file for PNG reference library 3 * 4 * libpng version 1.2.26 - April 2, 2008 5 * Copyright (c) 1998-2008 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 1.2.26 - April 2, 2008: 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 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] 159 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] 160 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] 161 * 1.0.28 10 10028 10.so.0.28[.0] 162 * 1.2.20 13 10220 12.so.0.20[.0] 163 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] 164 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] 165 * 1.0.29 10 10029 10.so.0.29[.0] 166 * 1.2.21 13 10221 12.so.0.21[.0] 167 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] 168 * 1.0.30rc1 10 10030 10.so.0.30[.0] 169 * 1.2.22rc1 13 10222 12.so.0.22[.0] 170 * 1.0.30 10 10030 10.so.0.30[.0] 171 * 1.2.22 13 10222 12.so.0.22[.0] 172 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] 173 * 1.2.23rc01 13 10223 12.so.0.23[.0] 174 * 1.2.23 13 10223 12.so.0.23[.0] 175 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] 176 * 1.2.24rc01 13 10224 12.so.0.24[.0] 177 * 1.2.24 13 10224 12.so.0.24[.0] 178 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] 179 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] 180 * 1.0.31 10 10031 10.so.0.31[.0] 181 * 1.2.25 13 10225 12.so.0.25[.0] 182 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] 183 * 1.2.26rc01 13 10226 12.so.0.26[.0] 184 * 185 * Henceforth the source version will match the shared-library major 186 * and minor numbers; the shared-library major version number will be 187 * used for changes in backward compatibility, as it is intended. The 188 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 189 * for applications, is an unsigned integer of the form xyyzz corresponding 190 * to the source version x.y.z (leading zeros in y and z). Beta versions 191 * were given the previous public release number plus a letter, until 192 * version 1.0.6j; from then on they were given the upcoming public 193 * release number plus "betaNN" or "rcN". 194 * 195 * Binary incompatibility exists only when applications make direct access 196 * to the info_ptr or png_ptr members through png.h, and the compiled 197 * application is loaded with a different version of the library. 198 * 199 * DLLNUM will change each time there are forward or backward changes 200 * in binary compatibility (e.g., when a new feature is added). 201 * 202 * See libpng.txt or libpng.3 for more information. The PNG specification 203 * is available as a W3C Recommendation and as an ISO Specification, 204 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 205 */ 206 207 /* 208 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 209 * 210 * If you modify libpng you may insert additional notices immediately following 211 * this sentence. 212 * 213 * libpng versions 1.2.6, August 15, 2004, through 1.2.26, April 2, 2008, are 214 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are 215 * distributed according to the same disclaimer and license as libpng-1.2.5 216 * with the following individual added to the list of Contributing Authors: 217 * 218 * Cosmin Truta 219 * 220 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 221 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 222 * distributed according to the same disclaimer and license as libpng-1.0.6 223 * with the following individuals added to the list of Contributing Authors: 224 * 225 * Simon-Pierre Cadieux 226 * Eric S. Raymond 227 * Gilles Vollant 228 * 229 * and with the following additions to the disclaimer: 230 * 231 * There is no warranty against interference with your enjoyment of the 232 * library or against infringement. There is no warranty that our 233 * efforts or the library will fulfill any of your particular purposes 234 * or needs. This library is provided with all faults, and the entire 235 * risk of satisfactory quality, performance, accuracy, and effort is with 236 * the user. 237 * 238 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 239 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 240 * distributed according to the same disclaimer and license as libpng-0.96, 241 * with the following individuals added to the list of Contributing Authors: 242 * 243 * Tom Lane 244 * Glenn Randers-Pehrson 245 * Willem van Schaik 246 * 247 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 248 * Copyright (c) 1996, 1997 Andreas Dilger 249 * Distributed according to the same disclaimer and license as libpng-0.88, 250 * with the following individuals added to the list of Contributing Authors: 251 * 252 * John Bowler 253 * Kevin Bracey 254 * Sam Bushell 255 * Magnus Holmgren 256 * Greg Roelofs 257 * Tom Tanner 258 * 259 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 260 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 261 * 262 * For the purposes of this copyright and license, "Contributing Authors" 263 * is defined as the following set of individuals: 264 * 265 * Andreas Dilger 266 * Dave Martindale 267 * Guy Eric Schalnat 268 * Paul Schmidt 269 * Tim Wegner 270 * 271 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 272 * and Group 42, Inc. disclaim all warranties, expressed or implied, 273 * including, without limitation, the warranties of merchantability and of 274 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 275 * assume no liability for direct, indirect, incidental, special, exemplary, 276 * or consequential damages, which may result from the use of the PNG 277 * Reference Library, even if advised of the possibility of such damage. 278 * 279 * Permission is hereby granted to use, copy, modify, and distribute this 280 * source code, or portions hereof, for any purpose, without fee, subject 281 * to the following restrictions: 282 * 283 * 1. The origin of this source code must not be misrepresented. 284 * 285 * 2. Altered versions must be plainly marked as such and 286 * must not be misrepresented as being the original source. 287 * 288 * 3. This Copyright notice may not be removed or altered from 289 * any source or altered source distribution. 290 * 291 * The Contributing Authors and Group 42, Inc. specifically permit, without 292 * fee, and encourage the use of this source code as a component to 293 * supporting the PNG file format in commercial products. If you use this 294 * source code in a product, acknowledgment is not required but would be 295 * appreciated. 296 */ 297 298 /* 299 * A "png_get_copyright" function is available, for convenient use in "about" 300 * boxes and the like: 301 * 302 * printf("%s",png_get_copyright(NULL)); 303 * 304 * Also, the PNG logo (in PNG format, of course) is supplied in the 305 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 306 */ 307 308 /* 309 * Libpng is OSI Certified Open Source Software. OSI Certified is a 310 * certification mark of the Open Source Initiative. 311 */ 312 313 /* 314 * The contributing authors would like to thank all those who helped 315 * with testing, bug fixes, and patience. This wouldn't have been 316 * possible without all of you. 317 * 318 * Thanks to Frank J. T. Wojcik for helping with the documentation. 319 */ 320 321 /* 322 * Y2K compliance in libpng: 323 * ========================= 324 * 325 * April 2, 2008 326 * 327 * Since the PNG Development group is an ad-hoc body, we can't make 328 * an official declaration. 329 * 330 * This is your unofficial assurance that libpng from version 0.71 and 331 * upward through 1.2.26 are Y2K compliant. It is my belief that earlier 332 * versions were also Y2K compliant. 333 * 334 * Libpng only has three year fields. One is a 2-byte unsigned integer 335 * that will hold years up to 65535. The other two hold the date in text 336 * format, and will hold years up to 9999. 337 * 338 * The integer is 339 * "png_uint_16 year" in png_time_struct. 340 * 341 * The strings are 342 * "png_charp time_buffer" in png_struct and 343 * "near_time_buffer", which is a local character string in png.c. 344 * 345 * There are seven time-related functions: 346 * png.c: png_convert_to_rfc_1123() in png.c 347 * (formerly png_convert_to_rfc_1152() in error) 348 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 349 * png_convert_from_time_t() in pngwrite.c 350 * png_get_tIME() in pngget.c 351 * png_handle_tIME() in pngrutil.c, called in pngread.c 352 * png_set_tIME() in pngset.c 353 * png_write_tIME() in pngwutil.c, called in pngwrite.c 354 * 355 * All handle dates properly in a Y2K environment. The 356 * png_convert_from_time_t() function calls gmtime() to convert from system 357 * clock time, which returns (year - 1900), which we properly convert to 358 * the full 4-digit year. There is a possibility that applications using 359 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 360 * function, or that they are incorrectly passing only a 2-digit year 361 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 362 * but this is not under our control. The libpng documentation has always 363 * stated that it works with 4-digit years, and the APIs have been 364 * documented as such. 365 * 366 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 367 * integer to hold the year, and can hold years as large as 65535. 368 * 369 * zlib, upon which libpng depends, is also Y2K compliant. It contains 370 * no date-related code. 371 * 372 * Glenn Randers-Pehrson 373 * libpng maintainer 374 * PNG Development Group 375 */ 376 377 #ifndef PNG_H 378 #define PNG_H 379 380 /* This is not the place to learn how to use libpng. The file libpng.txt 381 * describes how to use libpng, and the file example.c summarizes it 382 * with some code on which to build. This file is useful for looking 383 * at the actual function definitions and structure components. 384 */ 385 386 /* Version information for png.h - this should match the version in png.c */ 387 #define PNG_LIBPNG_VER_STRING "1.2.26" 388 #define PNG_HEADER_VERSION_STRING \ 389 " libpng version 1.2.26 - April 2, 2008\n" 390 391 #define PNG_LIBPNG_VER_SONUM 0 392 #define PNG_LIBPNG_VER_DLLNUM 13 393 394 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 395 #define PNG_LIBPNG_VER_MAJOR 1 396 #define PNG_LIBPNG_VER_MINOR 2 397 #define PNG_LIBPNG_VER_RELEASE 26 398 /* This should match the numeric part of the final component of 399 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ 400 401 #define PNG_LIBPNG_VER_BUILD 0 402 403 /* Release Status */ 404 #define PNG_LIBPNG_BUILD_ALPHA 1 405 #define PNG_LIBPNG_BUILD_BETA 2 406 #define PNG_LIBPNG_BUILD_RC 3 407 #define PNG_LIBPNG_BUILD_STABLE 4 408 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 409 410 /* Release-Specific Flags */ 411 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 412 PNG_LIBPNG_BUILD_STABLE only */ 413 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 414 PNG_LIBPNG_BUILD_SPECIAL */ 415 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 416 PNG_LIBPNG_BUILD_PRIVATE */ 417 418 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 419 420 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 421 * We must not include leading zeros. 422 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 423 * version 1.0.0 was mis-numbered 100 instead of 10000). From 424 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ 425 #define PNG_LIBPNG_VER 10226 /* 1.2.26 */ 426 427 #ifndef PNG_VERSION_INFO_ONLY 428 /* include the compression library's header */ 429 #include "zlib.h" 430 #endif 431 432 /* include all user configurable info, including optional assembler routines */ 433 #include "pngconf.h" 434 435 /* 436 * Added at libpng-1.2.8 */ 437 /* Ref MSDN: Private as priority over Special 438 * VS_FF_PRIVATEBUILD File *was not* built using standard release 439 * procedures. If this value is given, the StringFileInfo block must 440 * contain a PrivateBuild string. 441 * 442 * VS_FF_SPECIALBUILD File *was* built by the original company using 443 * standard release procedures but is a variation of the standard 444 * file of the same version number. If this value is given, the 445 * StringFileInfo block must contain a SpecialBuild string. 446 */ 447 448 #if defined(PNG_USER_PRIVATEBUILD) 449 # define PNG_LIBPNG_BUILD_TYPE \ 450 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 451 #else 452 # if defined(PNG_LIBPNG_SPECIALBUILD) 453 # define PNG_LIBPNG_BUILD_TYPE \ 454 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 455 # else 456 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 457 # endif 458 #endif 459 460 #ifndef PNG_VERSION_INFO_ONLY 461 462 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 463 #ifdef __cplusplus 464 extern "C" { 465 #endif /* __cplusplus */ 466 467 /* This file is arranged in several sections. The first section contains 468 * structure and type definitions. The second section contains the external 469 * library functions, while the third has the internal library functions, 470 * which applications aren't expected to use directly. 471 */ 472 473 #ifndef PNG_NO_TYPECAST_NULL 474 #define int_p_NULL (int *)NULL 475 #define png_bytep_NULL (png_bytep)NULL 476 #define png_bytepp_NULL (png_bytepp)NULL 477 #define png_doublep_NULL (png_doublep)NULL 478 #define png_error_ptr_NULL (png_error_ptr)NULL 479 #define png_flush_ptr_NULL (png_flush_ptr)NULL 480 #define png_free_ptr_NULL (png_free_ptr)NULL 481 #define png_infopp_NULL (png_infopp)NULL 482 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 483 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 484 #define png_rw_ptr_NULL (png_rw_ptr)NULL 485 #define png_structp_NULL (png_structp)NULL 486 #define png_uint_16p_NULL (png_uint_16p)NULL 487 #define png_voidp_NULL (png_voidp)NULL 488 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 489 #else 490 #define int_p_NULL NULL 491 #define png_bytep_NULL NULL 492 #define png_bytepp_NULL NULL 493 #define png_doublep_NULL NULL 494 #define png_error_ptr_NULL NULL 495 #define png_flush_ptr_NULL NULL 496 #define png_free_ptr_NULL NULL 497 #define png_infopp_NULL NULL 498 #define png_malloc_ptr_NULL NULL 499 #define png_read_status_ptr_NULL NULL 500 #define png_rw_ptr_NULL NULL 501 #define png_structp_NULL NULL 502 #define png_uint_16p_NULL NULL 503 #define png_voidp_NULL NULL 504 #define png_write_status_ptr_NULL NULL 505 #endif 506 507 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 508 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 509 /* Version information for C files, stored in png.c. This had better match 510 * the version above. 511 */ 512 #ifdef PNG_USE_GLOBAL_ARRAYS 513 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 514 /* need room for 99.99.99beta99z */ 515 #else 516 #define png_libpng_ver png_get_header_ver(NULL) 517 #endif 518 519 #ifdef PNG_USE_GLOBAL_ARRAYS 520 /* This was removed in version 1.0.5c */ 521 /* Structures to facilitate easy interlacing. See png.c for more details */ 522 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 523 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 524 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 525 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 526 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 527 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 528 /* This isn't currently used. If you need it, see png.c for more details. 529 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 530 */ 531 #endif 532 533 #endif /* PNG_NO_EXTERN */ 534 535 /* Three color definitions. The order of the red, green, and blue, (and the 536 * exact size) is not important, although the size of the fields need to 537 * be png_byte or png_uint_16 (as defined below). 538 */ 539 typedef struct png_color_struct 540 { 541 png_byte red; 542 png_byte green; 543 png_byte blue; 544 } png_color; 545 typedef png_color FAR * png_colorp; 546 typedef png_color FAR * FAR * png_colorpp; 547 548 typedef struct png_color_16_struct 549 { 550 png_byte index; /* used for palette files */ 551 png_uint_16 red; /* for use in red green blue files */ 552 png_uint_16 green; 553 png_uint_16 blue; 554 png_uint_16 gray; /* for use in grayscale files */ 555 } png_color_16; 556 typedef png_color_16 FAR * png_color_16p; 557 typedef png_color_16 FAR * FAR * png_color_16pp; 558 559 typedef struct png_color_8_struct 560 { 561 png_byte red; /* for use in red green blue files */ 562 png_byte green; 563 png_byte blue; 564 png_byte gray; /* for use in grayscale files */ 565 png_byte alpha; /* for alpha channel files */ 566 } png_color_8; 567 typedef png_color_8 FAR * png_color_8p; 568 typedef png_color_8 FAR * FAR * png_color_8pp; 569 570 /* 571 * The following two structures are used for the in-core representation 572 * of sPLT chunks. 573 */ 574 typedef struct png_sPLT_entry_struct 575 { 576 png_uint_16 red; 577 png_uint_16 green; 578 png_uint_16 blue; 579 png_uint_16 alpha; 580 png_uint_16 frequency; 581 } png_sPLT_entry; 582 typedef png_sPLT_entry FAR * png_sPLT_entryp; 583 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 584 585 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 586 * occupy the LSB of their respective members, and the MSB of each member 587 * is zero-filled. The frequency member always occupies the full 16 bits. 588 */ 589 590 typedef struct png_sPLT_struct 591 { 592 png_charp name; /* palette name */ 593 png_byte depth; /* depth of palette samples */ 594 png_sPLT_entryp entries; /* palette entries */ 595 png_int_32 nentries; /* number of palette entries */ 596 } png_sPLT_t; 597 typedef png_sPLT_t FAR * png_sPLT_tp; 598 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 599 600 #ifdef PNG_TEXT_SUPPORTED 601 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 602 * and whether that contents is compressed or not. The "key" field 603 * points to a regular zero-terminated C string. The "text", "lang", and 604 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 605 * However, the * structure returned by png_get_text() will always contain 606 * regular zero-terminated C strings (possibly empty), never NULL pointers, 607 * so they can be safely used in printf() and other string-handling functions. 608 */ 609 typedef struct png_text_struct 610 { 611 int compression; /* compression value: 612 -1: tEXt, none 613 0: zTXt, deflate 614 1: iTXt, none 615 2: iTXt, deflate */ 616 png_charp key; /* keyword, 1-79 character description of "text" */ 617 png_charp text; /* comment, may be an empty string (ie "") 618 or a NULL pointer */ 619 png_size_t text_length; /* length of the text string */ 620 #ifdef PNG_iTXt_SUPPORTED 621 png_size_t itxt_length; /* length of the itxt string */ 622 png_charp lang; /* language code, 0-79 characters 623 or a NULL pointer */ 624 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 625 chars or a NULL pointer */ 626 #endif 627 } png_text; 628 typedef png_text FAR * png_textp; 629 typedef png_text FAR * FAR * png_textpp; 630 #endif 631 632 /* Supported compression types for text in PNG files (tEXt, and zTXt). 633 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 634 #define PNG_TEXT_COMPRESSION_NONE_WR -3 635 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 636 #define PNG_TEXT_COMPRESSION_NONE -1 637 #define PNG_TEXT_COMPRESSION_zTXt 0 638 #define PNG_ITXT_COMPRESSION_NONE 1 639 #define PNG_ITXT_COMPRESSION_zTXt 2 640 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 641 642 /* png_time is a way to hold the time in an machine independent way. 643 * Two conversions are provided, both from time_t and struct tm. There 644 * is no portable way to convert to either of these structures, as far 645 * as I know. If you know of a portable way, send it to me. As a side 646 * note - PNG has always been Year 2000 compliant! 647 */ 648 typedef struct png_time_struct 649 { 650 png_uint_16 year; /* full year, as in, 1995 */ 651 png_byte month; /* month of year, 1 - 12 */ 652 png_byte day; /* day of month, 1 - 31 */ 653 png_byte hour; /* hour of day, 0 - 23 */ 654 png_byte minute; /* minute of hour, 0 - 59 */ 655 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 656 } png_time; 657 typedef png_time FAR * png_timep; 658 typedef png_time FAR * FAR * png_timepp; 659 660 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 661 /* png_unknown_chunk is a structure to hold queued chunks for which there is 662 * no specific support. The idea is that we can use this to queue 663 * up private chunks for output even though the library doesn't actually 664 * know about their semantics. 665 */ 666 #define PNG_CHUNK_NAME_LENGTH 5 667 typedef struct png_unknown_chunk_t 668 { 669 png_byte name[PNG_CHUNK_NAME_LENGTH]; 670 png_byte *data; 671 png_size_t size; 672 673 /* libpng-using applications should NOT directly modify this byte. */ 674 png_byte location; /* mode of operation at read time */ 675 } 676 png_unknown_chunk; 677 typedef png_unknown_chunk FAR * png_unknown_chunkp; 678 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 679 #endif 680 681 /* png_info is a structure that holds the information in a PNG file so 682 * that the application can find out the characteristics of the image. 683 * If you are reading the file, this structure will tell you what is 684 * in the PNG file. If you are writing the file, fill in the information 685 * you want to put into the PNG file, then call png_write_info(). 686 * The names chosen should be very close to the PNG specification, so 687 * consult that document for information about the meaning of each field. 688 * 689 * With libpng < 0.95, it was only possible to directly set and read the 690 * the values in the png_info_struct, which meant that the contents and 691 * order of the values had to remain fixed. With libpng 0.95 and later, 692 * however, there are now functions that abstract the contents of 693 * png_info_struct from the application, so this makes it easier to use 694 * libpng with dynamic libraries, and even makes it possible to use 695 * libraries that don't have all of the libpng ancillary chunk-handing 696 * functionality. 697 * 698 * In any case, the order of the parameters in png_info_struct should NOT 699 * be changed for as long as possible to keep compatibility with applications 700 * that use the old direct-access method with png_info_struct. 701 * 702 * The following members may have allocated storage attached that should be 703 * cleaned up before the structure is discarded: palette, trans, text, 704 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 705 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 706 * are automatically freed when the info structure is deallocated, if they were 707 * allocated internally by libpng. This behavior can be changed by means 708 * of the png_data_freer() function. 709 * 710 * More allocation details: all the chunk-reading functions that 711 * change these members go through the corresponding png_set_* 712 * functions. A function to clear these members is available: see 713 * png_free_data(). The png_set_* functions do not depend on being 714 * able to point info structure members to any of the storage they are 715 * passed (they make their own copies), EXCEPT that the png_set_text 716 * functions use the same storage passed to them in the text_ptr or 717 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 718 * functions do not make their own copies. 719 */ 720 typedef struct png_info_struct 721 { 722 /* the following are necessary for every PNG file */ 723 png_uint_32 width; /* width of image in pixels (from IHDR) */ 724 png_uint_32 height; /* height of image in pixels (from IHDR) */ 725 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 726 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 727 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 728 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 729 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 730 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 731 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 732 /* The following three should have been named *_method not *_type */ 733 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 734 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 735 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 736 737 /* The following is informational only on read, and not used on writes. */ 738 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 739 png_byte pixel_depth; /* number of bits per pixel */ 740 png_byte spare_byte; /* to align the data, and for future use */ 741 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 742 743 /* The rest of the data is optional. If you are reading, check the 744 * valid field to see if the information in these are valid. If you 745 * are writing, set the valid field to those chunks you want written, 746 * and initialize the appropriate fields below. 747 */ 748 749 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 750 /* The gAMA chunk describes the gamma characteristics of the system 751 * on which the image was created, normally in the range [1.0, 2.5]. 752 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 753 */ 754 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 755 #endif 756 757 #if defined(PNG_sRGB_SUPPORTED) 758 /* GR-P, 0.96a */ 759 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 760 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 761 #endif 762 763 #if defined(PNG_TEXT_SUPPORTED) 764 /* The tEXt, and zTXt chunks contain human-readable textual data in 765 * uncompressed, compressed, and optionally compressed forms, respectively. 766 * The data in "text" is an array of pointers to uncompressed, 767 * null-terminated C strings. Each chunk has a keyword that describes the 768 * textual data contained in that chunk. Keywords are not required to be 769 * unique, and the text string may be empty. Any number of text chunks may 770 * be in an image. 771 */ 772 int num_text; /* number of comments read/to write */ 773 int max_text; /* current size of text array */ 774 png_textp text; /* array of comments read/to write */ 775 #endif /* PNG_TEXT_SUPPORTED */ 776 777 #if defined(PNG_tIME_SUPPORTED) 778 /* The tIME chunk holds the last time the displayed image data was 779 * modified. See the png_time struct for the contents of this struct. 780 */ 781 png_time mod_time; 782 #endif 783 784 #if defined(PNG_sBIT_SUPPORTED) 785 /* The sBIT chunk specifies the number of significant high-order bits 786 * in the pixel data. Values are in the range [1, bit_depth], and are 787 * only specified for the channels in the pixel data. The contents of 788 * the low-order bits is not specified. Data is valid if 789 * (valid & PNG_INFO_sBIT) is non-zero. 790 */ 791 png_color_8 sig_bit; /* significant bits in color channels */ 792 #endif 793 794 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 795 defined(PNG_READ_BACKGROUND_SUPPORTED) 796 /* The tRNS chunk supplies transparency data for paletted images and 797 * other image types that don't need a full alpha channel. There are 798 * "num_trans" transparency values for a paletted image, stored in the 799 * same order as the palette colors, starting from index 0. Values 800 * for the data are in the range [0, 255], ranging from fully transparent 801 * to fully opaque, respectively. For non-paletted images, there is a 802 * single color specified that should be treated as fully transparent. 803 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 804 */ 805 png_bytep trans; /* transparent values for paletted image */ 806 png_color_16 trans_values; /* transparent color for non-palette image */ 807 #endif 808 809 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 810 /* The bKGD chunk gives the suggested image background color if the 811 * display program does not have its own background color and the image 812 * is needs to composited onto a background before display. The colors 813 * in "background" are normally in the same color space/depth as the 814 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 815 */ 816 png_color_16 background; 817 #endif 818 819 #if defined(PNG_oFFs_SUPPORTED) 820 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 821 * and downwards from the top-left corner of the display, page, or other 822 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 823 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 824 */ 825 png_int_32 x_offset; /* x offset on page */ 826 png_int_32 y_offset; /* y offset on page */ 827 png_byte offset_unit_type; /* offset units type */ 828 #endif 829 830 #if defined(PNG_pHYs_SUPPORTED) 831 /* The pHYs chunk gives the physical pixel density of the image for 832 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 833 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 834 */ 835 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 836 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 837 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 838 #endif 839 840 #if defined(PNG_hIST_SUPPORTED) 841 /* The hIST chunk contains the relative frequency or importance of the 842 * various palette entries, so that a viewer can intelligently select a 843 * reduced-color palette, if required. Data is an array of "num_palette" 844 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 845 * is non-zero. 846 */ 847 png_uint_16p hist; 848 #endif 849 850 #ifdef PNG_cHRM_SUPPORTED 851 /* The cHRM chunk describes the CIE color characteristics of the monitor 852 * on which the PNG was created. This data allows the viewer to do gamut 853 * mapping of the input image to ensure that the viewer sees the same 854 * colors in the image as the creator. Values are in the range 855 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 856 */ 857 #ifdef PNG_FLOATING_POINT_SUPPORTED 858 float x_white; 859 float y_white; 860 float x_red; 861 float y_red; 862 float x_green; 863 float y_green; 864 float x_blue; 865 float y_blue; 866 #endif 867 #endif 868 869 #if defined(PNG_pCAL_SUPPORTED) 870 /* The pCAL chunk describes a transformation between the stored pixel 871 * values and original physical data values used to create the image. 872 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 873 * range given by [pcal_X0, pcal_X1], and are further transformed by a 874 * (possibly non-linear) transformation function given by "pcal_type" 875 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 876 * defines below, and the PNG-Group's PNG extensions document for a 877 * complete description of the transformations and how they should be 878 * implemented, and for a description of the ASCII parameter strings. 879 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 880 */ 881 png_charp pcal_purpose; /* pCAL chunk description string */ 882 png_int_32 pcal_X0; /* minimum value */ 883 png_int_32 pcal_X1; /* maximum value */ 884 png_charp pcal_units; /* Latin-1 string giving physical units */ 885 png_charpp pcal_params; /* ASCII strings containing parameter values */ 886 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 887 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 888 #endif 889 890 /* New members added in libpng-1.0.6 */ 891 #ifdef PNG_FREE_ME_SUPPORTED 892 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 893 #endif 894 895 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 896 /* storage for unknown chunks that the library doesn't recognize. */ 897 png_unknown_chunkp unknown_chunks; 898 png_size_t unknown_chunks_num; 899 #endif 900 901 #if defined(PNG_iCCP_SUPPORTED) 902 /* iCCP chunk data. */ 903 png_charp iccp_name; /* profile name */ 904 png_charp iccp_profile; /* International Color Consortium profile data */ 905 /* Note to maintainer: should be png_bytep */ 906 png_uint_32 iccp_proflen; /* ICC profile data length */ 907 png_byte iccp_compression; /* Always zero */ 908 #endif 909 910 #if defined(PNG_sPLT_SUPPORTED) 911 /* data on sPLT chunks (there may be more than one). */ 912 png_sPLT_tp splt_palettes; 913 png_uint_32 splt_palettes_num; 914 #endif 915 916 #if defined(PNG_sCAL_SUPPORTED) 917 /* The sCAL chunk describes the actual physical dimensions of the 918 * subject matter of the graphic. The chunk contains a unit specification 919 * a byte value, and two ASCII strings representing floating-point 920 * values. The values are width and height corresponsing to one pixel 921 * in the image. This external representation is converted to double 922 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 923 */ 924 png_byte scal_unit; /* unit of physical scale */ 925 #ifdef PNG_FLOATING_POINT_SUPPORTED 926 double scal_pixel_width; /* width of one pixel */ 927 double scal_pixel_height; /* height of one pixel */ 928 #endif 929 #ifdef PNG_FIXED_POINT_SUPPORTED 930 png_charp scal_s_width; /* string containing height */ 931 png_charp scal_s_height; /* string containing width */ 932 #endif 933 #endif 934 935 #if defined(PNG_INFO_IMAGE_SUPPORTED) 936 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 937 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 938 png_bytepp row_pointers; /* the image bits */ 939 #endif 940 941 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 942 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 943 #endif 944 945 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 946 png_fixed_point int_x_white; 947 png_fixed_point int_y_white; 948 png_fixed_point int_x_red; 949 png_fixed_point int_y_red; 950 png_fixed_point int_x_green; 951 png_fixed_point int_y_green; 952 png_fixed_point int_x_blue; 953 png_fixed_point int_y_blue; 954 #endif 955 956 } png_info; 957 958 typedef png_info FAR * png_infop; 959 typedef png_info FAR * FAR * png_infopp; 960 961 /* Maximum positive integer used in PNG is (2^31)-1 */ 962 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 963 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 964 #define PNG_SIZE_MAX ((png_size_t)(-1)) 965 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 966 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 967 #define PNG_MAX_UINT PNG_UINT_31_MAX 968 #endif 969 970 /* These describe the color_type field in png_info. */ 971 /* color type masks */ 972 #define PNG_COLOR_MASK_PALETTE 1 973 #define PNG_COLOR_MASK_COLOR 2 974 #define PNG_COLOR_MASK_ALPHA 4 975 976 /* color types. Note that not all combinations are legal */ 977 #define PNG_COLOR_TYPE_GRAY 0 978 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 979 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 980 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 981 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 982 /* aliases */ 983 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 984 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 985 986 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 987 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 988 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 989 990 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 991 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 992 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 993 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 994 995 /* These are for the interlacing type. These values should NOT be changed. */ 996 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 997 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 998 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 999 1000 /* These are for the oFFs chunk. These values should NOT be changed. */ 1001 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1002 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1003 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1004 1005 /* These are for the pCAL chunk. These values should NOT be changed. */ 1006 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1007 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1008 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1009 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1010 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1011 1012 /* These are for the sCAL chunk. These values should NOT be changed. */ 1013 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1014 #define PNG_SCALE_METER 1 /* meters per pixel */ 1015 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1016 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1017 1018 /* These are for the pHYs chunk. These values should NOT be changed. */ 1019 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1020 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1021 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1022 1023 /* These are for the sRGB chunk. These values should NOT be changed. */ 1024 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1025 #define PNG_sRGB_INTENT_RELATIVE 1 1026 #define PNG_sRGB_INTENT_SATURATION 2 1027 #define PNG_sRGB_INTENT_ABSOLUTE 3 1028 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1029 1030 /* This is for text chunks */ 1031 #define PNG_KEYWORD_MAX_LENGTH 79 1032 1033 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1034 #define PNG_MAX_PALETTE_LENGTH 256 1035 1036 /* These determine if an ancillary chunk's data has been successfully read 1037 * from the PNG header, or if the application has filled in the corresponding 1038 * data in the info_struct to be written into the output file. The values 1039 * of the PNG_INFO_<chunk> defines should NOT be changed. 1040 */ 1041 #define PNG_INFO_gAMA 0x0001 1042 #define PNG_INFO_sBIT 0x0002 1043 #define PNG_INFO_cHRM 0x0004 1044 #define PNG_INFO_PLTE 0x0008 1045 #define PNG_INFO_tRNS 0x0010 1046 #define PNG_INFO_bKGD 0x0020 1047 #define PNG_INFO_hIST 0x0040 1048 #define PNG_INFO_pHYs 0x0080 1049 #define PNG_INFO_oFFs 0x0100 1050 #define PNG_INFO_tIME 0x0200 1051 #define PNG_INFO_pCAL 0x0400 1052 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1053 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1054 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1055 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1056 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1057 1058 /* This is used for the transformation routines, as some of them 1059 * change these values for the row. It also should enable using 1060 * the routines for other purposes. 1061 */ 1062 typedef struct png_row_info_struct 1063 { 1064 png_uint_32 width; /* width of row */ 1065 png_uint_32 rowbytes; /* number of bytes in row */ 1066 png_byte color_type; /* color type of row */ 1067 png_byte bit_depth; /* bit depth of row */ 1068 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1069 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1070 } png_row_info; 1071 1072 typedef png_row_info FAR * png_row_infop; 1073 typedef png_row_info FAR * FAR * png_row_infopp; 1074 1075 /* These are the function types for the I/O functions and for the functions 1076 * that allow the user to override the default I/O functions with his or her 1077 * own. The png_error_ptr type should match that of user-supplied warning 1078 * and error functions, while the png_rw_ptr type should match that of the 1079 * user read/write data functions. 1080 */ 1081 typedef struct png_struct_def png_struct; 1082 typedef png_struct FAR * png_structp; 1083 1084 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1085 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1086 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1087 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1088 int)); 1089 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1090 int)); 1091 1092 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1093 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1094 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1095 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1096 png_uint_32, int)); 1097 #endif 1098 1099 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1100 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1101 defined(PNG_LEGACY_SUPPORTED) 1102 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1103 png_row_infop, png_bytep)); 1104 #endif 1105 1106 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1107 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1108 #endif 1109 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1110 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1111 #endif 1112 1113 /* Transform masks for the high-level interface */ 1114 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1115 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1116 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1117 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1118 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1119 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1120 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1121 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1122 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1123 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1124 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1125 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1126 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ 1127 1128 /* Flags for MNG supported features */ 1129 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1130 #define PNG_FLAG_MNG_FILTER_64 0x04 1131 #define PNG_ALL_MNG_FEATURES 0x05 1132 1133 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1134 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1135 1136 /* The structure that holds the information to read and write PNG files. 1137 * The only people who need to care about what is inside of this are the 1138 * people who will be modifying the library for their own special needs. 1139 * It should NOT be accessed directly by an application, except to store 1140 * the jmp_buf. 1141 */ 1142 1143 struct png_struct_def 1144 { 1145 #ifdef PNG_SETJMP_SUPPORTED 1146 jmp_buf jmpbuf; /* used in png_error */ 1147 #endif 1148 png_error_ptr error_fn; /* function for printing errors and aborting */ 1149 png_error_ptr warning_fn; /* function for printing warnings */ 1150 png_voidp error_ptr; /* user supplied struct for error functions */ 1151 png_rw_ptr write_data_fn; /* function for writing output data */ 1152 png_rw_ptr read_data_fn; /* function for reading input data */ 1153 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1154 1155 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1156 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1157 #endif 1158 1159 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1160 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1161 #endif 1162 1163 /* These were added in libpng-1.0.2 */ 1164 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1165 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1166 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1167 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1168 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1169 png_byte user_transform_channels; /* channels in user transformed pixels */ 1170 #endif 1171 #endif 1172 1173 png_uint_32 mode; /* tells us where we are in the PNG file */ 1174 png_uint_32 flags; /* flags indicating various things to libpng */ 1175 png_uint_32 transformations; /* which transformations to perform */ 1176 1177 z_stream zstream; /* pointer to decompression structure (below) */ 1178 png_bytep zbuf; /* buffer for zlib */ 1179 png_size_t zbuf_size; /* size of zbuf */ 1180 int zlib_level; /* holds zlib compression level */ 1181 int zlib_method; /* holds zlib compression method */ 1182 int zlib_window_bits; /* holds zlib compression window bits */ 1183 int zlib_mem_level; /* holds zlib compression memory level */ 1184 int zlib_strategy; /* holds zlib compression strategy */ 1185 1186 png_uint_32 width; /* width of image in pixels */ 1187 png_uint_32 height; /* height of image in pixels */ 1188 png_uint_32 num_rows; /* number of rows in current pass */ 1189 png_uint_32 usr_width; /* width of row at start of write */ 1190 png_uint_32 rowbytes; /* size of row in bytes */ 1191 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1192 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1193 png_uint_32 row_number; /* current row in interlace pass */ 1194 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1195 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1196 #ifndef PNG_NO_WRITE_FILTERING 1197 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1198 png_bytep up_row; /* buffer to save "up" row when filtering */ 1199 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1200 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1201 #endif 1202 png_row_info row_info; /* used for transformation routines */ 1203 1204 png_uint_32 idat_size; /* current IDAT size for read */ 1205 png_uint_32 crc; /* current chunk CRC value */ 1206 png_colorp palette; /* palette from the input file */ 1207 png_uint_16 num_palette; /* number of color entries in palette */ 1208 png_uint_16 num_trans; /* number of transparency values */ 1209 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1210 png_byte compression; /* file compression type (always 0) */ 1211 png_byte filter; /* file filter type (always 0) */ 1212 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1213 png_byte pass; /* current interlace pass (0 - 6) */ 1214 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1215 png_byte color_type; /* color type of file */ 1216 png_byte bit_depth; /* bit depth of file */ 1217 png_byte usr_bit_depth; /* bit depth of users row */ 1218 png_byte pixel_depth; /* number of bits per pixel */ 1219 png_byte channels; /* number of channels in file */ 1220 png_byte usr_channels; /* channels at start of write */ 1221 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1222 1223 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1224 #ifdef PNG_LEGACY_SUPPORTED 1225 png_byte filler; /* filler byte for pixel expansion */ 1226 #else 1227 png_uint_16 filler; /* filler bytes for pixel expansion */ 1228 #endif 1229 #endif 1230 1231 #if defined(PNG_bKGD_SUPPORTED) 1232 png_byte background_gamma_type; 1233 # ifdef PNG_FLOATING_POINT_SUPPORTED 1234 float background_gamma; 1235 # endif 1236 png_color_16 background; /* background color in screen gamma space */ 1237 #if defined(PNG_READ_GAMMA_SUPPORTED) 1238 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1239 #endif 1240 #endif /* PNG_bKGD_SUPPORTED */ 1241 1242 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1243 png_flush_ptr output_flush_fn;/* Function for flushing output */ 1244 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1245 png_uint_32 flush_rows; /* number of rows written since last flush */ 1246 #endif 1247 1248 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1249 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1250 #ifdef PNG_FLOATING_POINT_SUPPORTED 1251 float gamma; /* file gamma value */ 1252 float screen_gamma; /* screen gamma value (display_exponent) */ 1253 #endif 1254 #endif 1255 1256 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1257 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1258 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1259 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1260 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1261 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1262 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1263 #endif 1264 1265 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1266 png_color_8 sig_bit; /* significant bits in each available channel */ 1267 #endif 1268 1269 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1270 png_color_8 shift; /* shift for significant bit tranformation */ 1271 #endif 1272 1273 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1274 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1275 png_bytep trans; /* transparency values for paletted files */ 1276 png_color_16 trans_values; /* transparency values for non-paletted files */ 1277 #endif 1278 1279 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1280 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1281 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1282 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1283 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1284 png_progressive_end_ptr end_fn; /* called after image is complete */ 1285 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1286 png_bytep save_buffer; /* buffer for previously read data */ 1287 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1288 png_bytep current_buffer; /* buffer for recently used data */ 1289 png_uint_32 push_length; /* size of current input chunk */ 1290 png_uint_32 skip_length; /* bytes to skip in input data */ 1291 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1292 png_size_t save_buffer_max; /* total size of save_buffer */ 1293 png_size_t buffer_size; /* total amount of available input data */ 1294 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1295 int process_mode; /* what push library is currently doing */ 1296 int cur_palette; /* current push library palette index */ 1297 1298 # if defined(PNG_TEXT_SUPPORTED) 1299 png_size_t current_text_size; /* current size of text input data */ 1300 png_size_t current_text_left; /* how much text left to read in input */ 1301 png_charp current_text; /* current text chunk buffer */ 1302 png_charp current_text_ptr; /* current location in current_text */ 1303 # endif /* PNG_TEXT_SUPPORTED */ 1304 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1305 1306 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1307 /* for the Borland special 64K segment handler */ 1308 png_bytepp offset_table_ptr; 1309 png_bytep offset_table; 1310 png_uint_16 offset_table_number; 1311 png_uint_16 offset_table_count; 1312 png_uint_16 offset_table_count_free; 1313 #endif 1314 1315 #if defined(PNG_READ_DITHER_SUPPORTED) 1316 png_bytep palette_lookup; /* lookup table for dithering */ 1317 png_bytep dither_index; /* index translation for palette files */ 1318 #endif 1319 1320 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1321 png_uint_16p hist; /* histogram */ 1322 #endif 1323 1324 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1325 png_byte heuristic_method; /* heuristic for row filter selection */ 1326 png_byte num_prev_filters; /* number of weights for previous rows */ 1327 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1328 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1329 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1330 png_uint_16p filter_costs; /* relative filter calculation cost */ 1331 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1332 #endif 1333 1334 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1335 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1336 #endif 1337 1338 /* New members added in libpng-1.0.6 */ 1339 1340 #ifdef PNG_FREE_ME_SUPPORTED 1341 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1342 #endif 1343 1344 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1345 png_voidp user_chunk_ptr; 1346 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1347 #endif 1348 1349 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1350 int num_chunk_list; 1351 png_bytep chunk_list; 1352 #endif 1353 1354 /* New members added in libpng-1.0.3 */ 1355 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1356 png_byte rgb_to_gray_status; 1357 /* These were changed from png_byte in libpng-1.0.6 */ 1358 png_uint_16 rgb_to_gray_red_coeff; 1359 png_uint_16 rgb_to_gray_green_coeff; 1360 png_uint_16 rgb_to_gray_blue_coeff; 1361 #endif 1362 1363 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1364 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1365 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1366 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1367 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1368 #ifdef PNG_1_0_X 1369 png_byte mng_features_permitted; 1370 #else 1371 png_uint_32 mng_features_permitted; 1372 #endif /* PNG_1_0_X */ 1373 #endif 1374 1375 /* New member added in libpng-1.0.7 */ 1376 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1377 png_fixed_point int_gamma; 1378 #endif 1379 1380 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1381 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1382 png_byte filter_type; 1383 #endif 1384 1385 #if defined(PNG_1_0_X) 1386 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1387 png_uint_32 row_buf_size; 1388 #endif 1389 1390 /* New members added in libpng-1.2.0 */ 1391 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1392 # if !defined(PNG_1_0_X) 1393 # if defined(PNG_MMX_CODE_SUPPORTED) 1394 png_byte mmx_bitdepth_threshold; 1395 png_uint_32 mmx_rowbytes_threshold; 1396 # endif 1397 png_uint_32 asm_flags; 1398 # endif 1399 #endif 1400 1401 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1402 #ifdef PNG_USER_MEM_SUPPORTED 1403 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1404 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1405 png_free_ptr free_fn; /* function for freeing memory */ 1406 #endif 1407 1408 /* New member added in libpng-1.0.13 and 1.2.0 */ 1409 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1410 1411 #if defined(PNG_READ_DITHER_SUPPORTED) 1412 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1413 png_bytep dither_sort; /* working sort array */ 1414 png_bytep index_to_palette; /* where the original index currently is */ 1415 /* in the palette */ 1416 png_bytep palette_to_index; /* which original index points to this */ 1417 /* palette color */ 1418 #endif 1419 1420 /* New members added in libpng-1.0.16 and 1.2.6 */ 1421 png_byte compression_type; 1422 1423 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1424 png_uint_32 user_width_max; 1425 png_uint_32 user_height_max; 1426 #endif 1427 1428 /* New member added in libpng-1.0.25 and 1.2.17 */ 1429 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1430 /* storage for unknown chunk that the library doesn't recognize. */ 1431 png_unknown_chunk unknown_chunk; 1432 #endif 1433 1434 /* New members added in libpng-1.2.26 */ 1435 png_uint_32 old_big_row_buf_size, old_prev_row_size; 1436 }; 1437 1438 1439 /* This triggers a compiler error in png.c, if png.c and png.h 1440 * do not agree upon the version number. 1441 */ 1442 typedef png_structp version_1_2_26; 1443 1444 typedef png_struct FAR * FAR * png_structpp; 1445 1446 /* Here are the function definitions most commonly used. This is not 1447 * the place to find out how to use libpng. See libpng.txt for the 1448 * full explanation, see example.c for the summary. This just provides 1449 * a simple one line description of the use of each function. 1450 */ 1451 1452 /* Returns the version number of the library */ 1453 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1454 1455 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1456 * Handling more than 8 bytes from the beginning of the file is an error. 1457 */ 1458 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1459 int num_bytes)); 1460 1461 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1462 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1463 * signature, and non-zero otherwise. Having num_to_check == 0 or 1464 * start > 7 will always fail (ie return non-zero). 1465 */ 1466 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1467 png_size_t num_to_check)); 1468 1469 /* Simple signature checking function. This is the same as calling 1470 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1471 */ 1472 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1473 1474 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1475 extern PNG_EXPORT(png_structp,png_create_read_struct) 1476 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1477 png_error_ptr error_fn, png_error_ptr warn_fn)); 1478 1479 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1480 extern PNG_EXPORT(png_structp,png_create_write_struct) 1481 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1482 png_error_ptr error_fn, png_error_ptr warn_fn)); 1483 1484 #ifdef PNG_WRITE_SUPPORTED 1485 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1486 PNGARG((png_structp png_ptr)); 1487 #endif 1488 1489 #ifdef PNG_WRITE_SUPPORTED 1490 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1491 PNGARG((png_structp png_ptr, png_uint_32 size)); 1492 #endif 1493 1494 /* Reset the compression stream */ 1495 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1496 1497 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1498 #ifdef PNG_USER_MEM_SUPPORTED 1499 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1500 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1501 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1502 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1503 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1504 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1505 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1506 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1507 #endif 1508 1509 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1510 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1511 png_bytep chunk_name, png_bytep data, png_size_t length)); 1512 1513 /* Write the start of a PNG chunk - length and chunk name. */ 1514 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1515 png_bytep chunk_name, png_uint_32 length)); 1516 1517 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1518 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1519 png_bytep data, png_size_t length)); 1520 1521 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1522 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1523 1524 /* Allocate and initialize the info structure */ 1525 extern PNG_EXPORT(png_infop,png_create_info_struct) 1526 PNGARG((png_structp png_ptr)); 1527 1528 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1529 /* Initialize the info structure (old interface - DEPRECATED) */ 1530 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1531 #undef png_info_init 1532 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1533 png_sizeof(png_info)); 1534 #endif 1535 1536 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1537 png_size_t png_info_struct_size)); 1538 1539 /* Writes all the PNG information before the image. */ 1540 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1541 png_infop info_ptr)); 1542 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1543 png_infop info_ptr)); 1544 1545 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1546 /* read the information before the actual image data. */ 1547 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1548 png_infop info_ptr)); 1549 #endif 1550 1551 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1552 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1553 PNGARG((png_structp png_ptr, png_timep ptime)); 1554 #endif 1555 1556 #if !defined(_WIN32_WCE) 1557 /* "time.h" functions are not supported on WindowsCE */ 1558 #if defined(PNG_WRITE_tIME_SUPPORTED) 1559 /* convert from a struct tm to png_time */ 1560 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1561 struct tm FAR * ttime)); 1562 1563 /* convert from time_t to png_time. Uses gmtime() */ 1564 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1565 time_t ttime)); 1566 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1567 #endif /* _WIN32_WCE */ 1568 1569 #if defined(PNG_READ_EXPAND_SUPPORTED) 1570 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1571 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1572 #if !defined(PNG_1_0_X) 1573 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1574 png_ptr)); 1575 #endif 1576 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1577 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1578 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1579 /* Deprecated */ 1580 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1581 #endif 1582 #endif 1583 1584 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1585 /* Use blue, green, red order for pixels. */ 1586 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1587 #endif 1588 1589 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1590 /* Expand the grayscale to 24-bit RGB if necessary. */ 1591 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1592 #endif 1593 1594 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1595 /* Reduce RGB to grayscale. */ 1596 #ifdef PNG_FLOATING_POINT_SUPPORTED 1597 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1598 int error_action, double red, double green )); 1599 #endif 1600 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1601 int error_action, png_fixed_point red, png_fixed_point green )); 1602 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1603 png_ptr)); 1604 #endif 1605 1606 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1607 png_colorp palette)); 1608 1609 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1610 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1611 #endif 1612 1613 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1614 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1615 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1616 #endif 1617 1618 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1619 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1620 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1621 #endif 1622 1623 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1624 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1625 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1626 png_uint_32 filler, int flags)); 1627 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1628 #define PNG_FILLER_BEFORE 0 1629 #define PNG_FILLER_AFTER 1 1630 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1631 #if !defined(PNG_1_0_X) 1632 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1633 png_uint_32 filler, int flags)); 1634 #endif 1635 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1636 1637 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1638 /* Swap bytes in 16-bit depth files. */ 1639 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1640 #endif 1641 1642 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1643 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1644 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1645 #endif 1646 1647 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1648 /* Swap packing order of pixels in bytes. */ 1649 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1650 #endif 1651 1652 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1653 /* Converts files to legal bit depths. */ 1654 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1655 png_color_8p true_bits)); 1656 #endif 1657 1658 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1659 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1660 /* Have the code handle the interlacing. Returns the number of passes. */ 1661 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1662 #endif 1663 1664 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1665 /* Invert monochrome files */ 1666 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1667 #endif 1668 1669 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1670 /* Handle alpha and tRNS by replacing with a background color. */ 1671 #ifdef PNG_FLOATING_POINT_SUPPORTED 1672 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1673 png_color_16p background_color, int background_gamma_code, 1674 int need_expand, double background_gamma)); 1675 #endif 1676 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1677 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1678 #define PNG_BACKGROUND_GAMMA_FILE 2 1679 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1680 #endif 1681 1682 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1683 /* strip the second byte of information from a 16-bit depth file. */ 1684 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1685 #endif 1686 1687 #if defined(PNG_READ_DITHER_SUPPORTED) 1688 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1689 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1690 png_colorp palette, int num_palette, int maximum_colors, 1691 png_uint_16p histogram, int full_dither)); 1692 #endif 1693 1694 #if defined(PNG_READ_GAMMA_SUPPORTED) 1695 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1696 #ifdef PNG_FLOATING_POINT_SUPPORTED 1697 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1698 double screen_gamma, double default_file_gamma)); 1699 #endif 1700 #endif 1701 1702 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1703 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1704 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1705 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1706 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1707 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1708 int empty_plte_permitted)); 1709 #endif 1710 #endif 1711 1712 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1713 /* Set how many lines between output flushes - 0 for no flushing */ 1714 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1715 /* Flush the current PNG output buffer */ 1716 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1717 #endif 1718 1719 /* optional update palette with requested transformations */ 1720 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1721 1722 /* optional call to update the users info structure */ 1723 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1724 png_infop info_ptr)); 1725 1726 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1727 /* read one or more rows of image data. */ 1728 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1729 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1730 #endif 1731 1732 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1733 /* read a row of data. */ 1734 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1735 png_bytep row, 1736 png_bytep display_row)); 1737 #endif 1738 1739 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1740 /* read the whole image into memory at once. */ 1741 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1742 png_bytepp image)); 1743 #endif 1744 1745 /* write a row of image data */ 1746 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1747 png_bytep row)); 1748 1749 /* write a few rows of image data */ 1750 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1751 png_bytepp row, png_uint_32 num_rows)); 1752 1753 /* write the image data */ 1754 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1755 png_bytepp image)); 1756 1757 /* writes the end of the PNG file. */ 1758 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1759 png_infop info_ptr)); 1760 1761 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1762 /* read the end of the PNG file. */ 1763 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1764 png_infop info_ptr)); 1765 #endif 1766 1767 /* free any memory associated with the png_info_struct */ 1768 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1769 png_infopp info_ptr_ptr)); 1770 1771 /* free any memory associated with the png_struct and the png_info_structs */ 1772 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1773 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1774 1775 /* free all memory used by the read (old method - NOT DLL EXPORTED) */ 1776 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1777 png_infop end_info_ptr)); 1778 1779 /* free any memory associated with the png_struct and the png_info_structs */ 1780 extern PNG_EXPORT(void,png_destroy_write_struct) 1781 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1782 1783 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1784 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1785 1786 /* set the libpng method of handling chunk CRC errors */ 1787 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1788 int crit_action, int ancil_action)); 1789 1790 /* Values for png_set_crc_action() to say how to handle CRC errors in 1791 * ancillary and critical chunks, and whether to use the data contained 1792 * therein. Note that it is impossible to "discard" data in a critical 1793 * chunk. For versions prior to 0.90, the action was always error/quit, 1794 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1795 * chunks is warn/discard. These values should NOT be changed. 1796 * 1797 * value action:critical action:ancillary 1798 */ 1799 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1800 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1801 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1802 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1803 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1804 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1805 1806 /* These functions give the user control over the scan-line filtering in 1807 * libpng and the compression methods used by zlib. These functions are 1808 * mainly useful for testing, as the defaults should work with most users. 1809 * Those users who are tight on memory or want faster performance at the 1810 * expense of compression can modify them. See the compression library 1811 * header file (zlib.h) for an explination of the compression functions. 1812 */ 1813 1814 /* set the filtering method(s) used by libpng. Currently, the only valid 1815 * value for "method" is 0. 1816 */ 1817 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1818 int filters)); 1819 1820 /* Flags for png_set_filter() to say which filters to use. The flags 1821 * are chosen so that they don't conflict with real filter types 1822 * below, in case they are supplied instead of the #defined constants. 1823 * These values should NOT be changed. 1824 */ 1825 #define PNG_NO_FILTERS 0x00 1826 #define PNG_FILTER_NONE 0x08 1827 #define PNG_FILTER_SUB 0x10 1828 #define PNG_FILTER_UP 0x20 1829 #define PNG_FILTER_AVG 0x40 1830 #define PNG_FILTER_PAETH 0x80 1831 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1832 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1833 1834 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1835 * These defines should NOT be changed. 1836 */ 1837 #define PNG_FILTER_VALUE_NONE 0 1838 #define PNG_FILTER_VALUE_SUB 1 1839 #define PNG_FILTER_VALUE_UP 2 1840 #define PNG_FILTER_VALUE_AVG 3 1841 #define PNG_FILTER_VALUE_PAETH 4 1842 #define PNG_FILTER_VALUE_LAST 5 1843 1844 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1845 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1846 * defines, either the default (minimum-sum-of-absolute-differences), or 1847 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1848 * 1849 * Weights are factors >= 1.0, indicating how important it is to keep the 1850 * filter type consistent between rows. Larger numbers mean the current 1851 * filter is that many times as likely to be the same as the "num_weights" 1852 * previous filters. This is cumulative for each previous row with a weight. 1853 * There needs to be "num_weights" values in "filter_weights", or it can be 1854 * NULL if the weights aren't being specified. Weights have no influence on 1855 * the selection of the first row filter. Well chosen weights can (in theory) 1856 * improve the compression for a given image. 1857 * 1858 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1859 * filter type. Higher costs indicate more decoding expense, and are 1860 * therefore less likely to be selected over a filter with lower computational 1861 * costs. There needs to be a value in "filter_costs" for each valid filter 1862 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1863 * setting the costs. Costs try to improve the speed of decompression without 1864 * unduly increasing the compressed image size. 1865 * 1866 * A negative weight or cost indicates the default value is to be used, and 1867 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1868 * The default values for both weights and costs are currently 1.0, but may 1869 * change if good general weighting/cost heuristics can be found. If both 1870 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1871 * to the UNWEIGHTED method, but with added encoding time/computation. 1872 */ 1873 #ifdef PNG_FLOATING_POINT_SUPPORTED 1874 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1875 int heuristic_method, int num_weights, png_doublep filter_weights, 1876 png_doublep filter_costs)); 1877 #endif 1878 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1879 1880 /* Heuristic used for row filter selection. These defines should NOT be 1881 * changed. 1882 */ 1883 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1884 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1885 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1886 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1887 1888 /* Set the library compression level. Currently, valid values range from 1889 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1890 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1891 * shown that zlib compression levels 3-6 usually perform as well as level 9 1892 * for PNG images, and do considerably fewer caclulations. In the future, 1893 * these values may not correspond directly to the zlib compression levels. 1894 */ 1895 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1896 int level)); 1897 1898 extern PNG_EXPORT(void,png_set_compression_mem_level) 1899 PNGARG((png_structp png_ptr, int mem_level)); 1900 1901 extern PNG_EXPORT(void,png_set_compression_strategy) 1902 PNGARG((png_structp png_ptr, int strategy)); 1903 1904 extern PNG_EXPORT(void,png_set_compression_window_bits) 1905 PNGARG((png_structp png_ptr, int window_bits)); 1906 1907 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1908 int method)); 1909 1910 /* These next functions are called for input/output, memory, and error 1911 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1912 * and call standard C I/O routines such as fread(), fwrite(), and 1913 * fprintf(). These functions can be made to use other I/O routines 1914 * at run time for those applications that need to handle I/O in a 1915 * different manner by calling png_set_???_fn(). See libpng.txt for 1916 * more information. 1917 */ 1918 1919 #if !defined(PNG_NO_STDIO) 1920 /* Initialize the input/output for the PNG file to the default functions. */ 1921 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1922 #endif 1923 1924 /* Replace the (error and abort), and warning functions with user 1925 * supplied functions. If no messages are to be printed you must still 1926 * write and use replacement functions. The replacement error_fn should 1927 * still do a longjmp to the last setjmp location if you are using this 1928 * method of error handling. If error_fn or warning_fn is NULL, the 1929 * default function will be used. 1930 */ 1931 1932 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1933 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1934 1935 /* Return the user pointer associated with the error functions */ 1936 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1937 1938 /* Replace the default data output functions with a user supplied one(s). 1939 * If buffered output is not used, then output_flush_fn can be set to NULL. 1940 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1941 * output_flush_fn will be ignored (and thus can be NULL). 1942 */ 1943 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 1944 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 1945 1946 /* Replace the default data input function with a user supplied one. */ 1947 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 1948 png_voidp io_ptr, png_rw_ptr read_data_fn)); 1949 1950 /* Return the user pointer associated with the I/O functions */ 1951 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 1952 1953 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 1954 png_read_status_ptr read_row_fn)); 1955 1956 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 1957 png_write_status_ptr write_row_fn)); 1958 1959 #ifdef PNG_USER_MEM_SUPPORTED 1960 /* Replace the default memory allocation functions with user supplied one(s). */ 1961 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 1962 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1963 /* Return the user pointer associated with the memory functions */ 1964 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 1965 #endif 1966 1967 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1968 defined(PNG_LEGACY_SUPPORTED) 1969 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 1970 png_ptr, png_user_transform_ptr read_user_transform_fn)); 1971 #endif 1972 1973 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1974 defined(PNG_LEGACY_SUPPORTED) 1975 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 1976 png_ptr, png_user_transform_ptr write_user_transform_fn)); 1977 #endif 1978 1979 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1980 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1981 defined(PNG_LEGACY_SUPPORTED) 1982 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 1983 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 1984 int user_transform_channels)); 1985 /* Return the user pointer associated with the user transform functions */ 1986 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 1987 PNGARG((png_structp png_ptr)); 1988 #endif 1989 1990 #ifdef PNG_USER_CHUNKS_SUPPORTED 1991 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 1992 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 1993 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 1994 png_ptr)); 1995 #endif 1996 1997 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1998 /* Sets the function callbacks for the push reader, and a pointer to a 1999 * user-defined structure available to the callback functions. 2000 */ 2001 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2002 png_voidp progressive_ptr, 2003 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2004 png_progressive_end_ptr end_fn)); 2005 2006 /* returns the user pointer associated with the push read functions */ 2007 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2008 PNGARG((png_structp png_ptr)); 2009 2010 /* function to be called when data becomes available */ 2011 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2012 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2013 2014 /* function that combines rows. Not very much different than the 2015 * png_combine_row() call. Is this even used????? 2016 */ 2017 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2018 png_bytep old_row, png_bytep new_row)); 2019 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2020 2021 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2022 png_uint_32 size)); 2023 2024 #if defined(PNG_1_0_X) 2025 # define png_malloc_warn png_malloc 2026 #else 2027 /* Added at libpng version 1.2.4 */ 2028 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2029 png_uint_32 size)); 2030 #endif 2031 2032 /* frees a pointer allocated by png_malloc() */ 2033 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2034 2035 #if defined(PNG_1_0_X) 2036 /* Function to allocate memory for zlib. */ 2037 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2038 uInt size)); 2039 2040 /* Function to free memory for zlib */ 2041 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2042 #endif 2043 2044 /* Free data that was allocated internally */ 2045 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2046 png_infop info_ptr, png_uint_32 free_me, int num)); 2047 #ifdef PNG_FREE_ME_SUPPORTED 2048 /* Reassign responsibility for freeing existing data, whether allocated 2049 * by libpng or by the application */ 2050 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2051 png_infop info_ptr, int freer, png_uint_32 mask)); 2052 #endif 2053 /* assignments for png_data_freer */ 2054 #define PNG_DESTROY_WILL_FREE_DATA 1 2055 #define PNG_SET_WILL_FREE_DATA 1 2056 #define PNG_USER_WILL_FREE_DATA 2 2057 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2058 #define PNG_FREE_HIST 0x0008 2059 #define PNG_FREE_ICCP 0x0010 2060 #define PNG_FREE_SPLT 0x0020 2061 #define PNG_FREE_ROWS 0x0040 2062 #define PNG_FREE_PCAL 0x0080 2063 #define PNG_FREE_SCAL 0x0100 2064 #define PNG_FREE_UNKN 0x0200 2065 #define PNG_FREE_LIST 0x0400 2066 #define PNG_FREE_PLTE 0x1000 2067 #define PNG_FREE_TRNS 0x2000 2068 #define PNG_FREE_TEXT 0x4000 2069 #define PNG_FREE_ALL 0x7fff 2070 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2071 2072 #ifdef PNG_USER_MEM_SUPPORTED 2073 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2074 png_uint_32 size)); 2075 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2076 png_voidp ptr)); 2077 #endif 2078 2079 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2080 png_voidp s1, png_voidp s2, png_uint_32 size)); 2081 2082 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2083 png_voidp s1, int value, png_uint_32 size)); 2084 2085 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2086 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2087 int check)); 2088 #endif /* USE_FAR_KEYWORD */ 2089 2090 #ifndef PNG_NO_ERROR_TEXT 2091 /* Fatal error in PNG image of libpng - can't continue */ 2092 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2093 png_const_charp error_message)); 2094 2095 /* The same, but the chunk name is prepended to the error string. */ 2096 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2097 png_const_charp error_message)); 2098 #else 2099 /* Fatal error in PNG image of libpng - can't continue */ 2100 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); 2101 #endif 2102 2103 #ifndef PNG_NO_WARNINGS 2104 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2105 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2106 png_const_charp warning_message)); 2107 2108 #ifdef PNG_READ_SUPPORTED 2109 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2110 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2111 png_const_charp warning_message)); 2112 #endif /* PNG_READ_SUPPORTED */ 2113 #endif /* PNG_NO_WARNINGS */ 2114 2115 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2116 * Similarly, the png_get_<chunk> calls are used to read values from the 2117 * png_info_struct, either storing the parameters in the passed variables, or 2118 * setting pointers into the png_info_struct where the data is stored. The 2119 * png_get_<chunk> functions return a non-zero value if the data was available 2120 * in info_ptr, or return zero and do not change any of the parameters if the 2121 * data was not available. 2122 * 2123 * These functions should be used instead of directly accessing png_info 2124 * to avoid problems with future changes in the size and internal layout of 2125 * png_info_struct. 2126 */ 2127 /* Returns "flag" if chunk data is valid in info_ptr. */ 2128 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2129 png_infop info_ptr, png_uint_32 flag)); 2130 2131 /* Returns number of bytes needed to hold a transformed row. */ 2132 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2133 png_infop info_ptr)); 2134 2135 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2136 /* Returns row_pointers, which is an array of pointers to scanlines that was 2137 returned from png_read_png(). */ 2138 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2139 png_infop info_ptr)); 2140 /* Set row_pointers, which is an array of pointers to scanlines for use 2141 by png_write_png(). */ 2142 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2143 png_infop info_ptr, png_bytepp row_pointers)); 2144 #endif 2145 2146 /* Returns number of color channels in image. */ 2147 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2148 png_infop info_ptr)); 2149 2150 #ifdef PNG_EASY_ACCESS_SUPPORTED 2151 /* Returns image width in pixels. */ 2152 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2153 png_ptr, png_infop info_ptr)); 2154 2155 /* Returns image height in pixels. */ 2156 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2157 png_ptr, png_infop info_ptr)); 2158 2159 /* Returns image bit_depth. */ 2160 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2161 png_ptr, png_infop info_ptr)); 2162 2163 /* Returns image color_type. */ 2164 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2165 png_ptr, png_infop info_ptr)); 2166 2167 /* Returns image filter_type. */ 2168 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2169 png_ptr, png_infop info_ptr)); 2170 2171 /* Returns image interlace_type. */ 2172 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2173 png_ptr, png_infop info_ptr)); 2174 2175 /* Returns image compression_type. */ 2176 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2177 png_ptr, png_infop info_ptr)); 2178 2179 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2180 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2181 png_ptr, png_infop info_ptr)); 2182 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2183 png_ptr, png_infop info_ptr)); 2184 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2185 png_ptr, png_infop info_ptr)); 2186 2187 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2188 #ifdef PNG_FLOATING_POINT_SUPPORTED 2189 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2190 png_ptr, png_infop info_ptr)); 2191 #endif 2192 2193 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2194 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2195 png_ptr, png_infop info_ptr)); 2196 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2197 png_ptr, png_infop info_ptr)); 2198 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2199 png_ptr, png_infop info_ptr)); 2200 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2201 png_ptr, png_infop info_ptr)); 2202 2203 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2204 2205 /* Returns pointer to signature string read from PNG header */ 2206 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2207 png_infop info_ptr)); 2208 2209 #if defined(PNG_bKGD_SUPPORTED) 2210 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2211 png_infop info_ptr, png_color_16p *background)); 2212 #endif 2213 2214 #if defined(PNG_bKGD_SUPPORTED) 2215 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2216 png_infop info_ptr, png_color_16p background)); 2217 #endif 2218 2219 #if defined(PNG_cHRM_SUPPORTED) 2220 #ifdef PNG_FLOATING_POINT_SUPPORTED 2221 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2222 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2223 double *red_y, double *green_x, double *green_y, double *blue_x, 2224 double *blue_y)); 2225 #endif 2226 #ifdef PNG_FIXED_POINT_SUPPORTED 2227 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2228 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2229 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2230 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2231 *int_blue_x, png_fixed_point *int_blue_y)); 2232 #endif 2233 #endif 2234 2235 #if defined(PNG_cHRM_SUPPORTED) 2236 #ifdef PNG_FLOATING_POINT_SUPPORTED 2237 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2238 png_infop info_ptr, double white_x, double white_y, double red_x, 2239 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2240 #endif 2241 #ifdef PNG_FIXED_POINT_SUPPORTED 2242 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2243 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2244 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2245 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2246 png_fixed_point int_blue_y)); 2247 #endif 2248 #endif 2249 2250 #if defined(PNG_gAMA_SUPPORTED) 2251 #ifdef PNG_FLOATING_POINT_SUPPORTED 2252 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2253 png_infop info_ptr, double *file_gamma)); 2254 #endif 2255 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2256 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2257 #endif 2258 2259 #if defined(PNG_gAMA_SUPPORTED) 2260 #ifdef PNG_FLOATING_POINT_SUPPORTED 2261 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2262 png_infop info_ptr, double file_gamma)); 2263 #endif 2264 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2265 png_infop info_ptr, png_fixed_point int_file_gamma)); 2266 #endif 2267 2268 #if defined(PNG_hIST_SUPPORTED) 2269 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2270 png_infop info_ptr, png_uint_16p *hist)); 2271 #endif 2272 2273 #if defined(PNG_hIST_SUPPORTED) 2274 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2275 png_infop info_ptr, png_uint_16p hist)); 2276 #endif 2277 2278 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2279 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2280 int *bit_depth, int *color_type, int *interlace_method, 2281 int *compression_method, int *filter_method)); 2282 2283 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2284 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2285 int color_type, int interlace_method, int compression_method, 2286 int filter_method)); 2287 2288 #if defined(PNG_oFFs_SUPPORTED) 2289 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2290 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2291 int *unit_type)); 2292 #endif 2293 2294 #if defined(PNG_oFFs_SUPPORTED) 2295 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2296 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2297 int unit_type)); 2298 #endif 2299 2300 #if defined(PNG_pCAL_SUPPORTED) 2301 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2302 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2303 int *type, int *nparams, png_charp *units, png_charpp *params)); 2304 #endif 2305 2306 #if defined(PNG_pCAL_SUPPORTED) 2307 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2308 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2309 int type, int nparams, png_charp units, png_charpp params)); 2310 #endif 2311 2312 #if defined(PNG_pHYs_SUPPORTED) 2313 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2314 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2315 #endif 2316 2317 #if defined(PNG_pHYs_SUPPORTED) 2318 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2319 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2320 #endif 2321 2322 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2323 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2324 2325 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2326 png_infop info_ptr, png_colorp palette, int num_palette)); 2327 2328 #if defined(PNG_sBIT_SUPPORTED) 2329 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2330 png_infop info_ptr, png_color_8p *sig_bit)); 2331 #endif 2332 2333 #if defined(PNG_sBIT_SUPPORTED) 2334 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2335 png_infop info_ptr, png_color_8p sig_bit)); 2336 #endif 2337 2338 #if defined(PNG_sRGB_SUPPORTED) 2339 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2340 png_infop info_ptr, int *intent)); 2341 #endif 2342 2343 #if defined(PNG_sRGB_SUPPORTED) 2344 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2345 png_infop info_ptr, int intent)); 2346 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2347 png_infop info_ptr, int intent)); 2348 #endif 2349 2350 #if defined(PNG_iCCP_SUPPORTED) 2351 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2352 png_infop info_ptr, png_charpp name, int *compression_type, 2353 png_charpp profile, png_uint_32 *proflen)); 2354 /* Note to maintainer: profile should be png_bytepp */ 2355 #endif 2356 2357 #if defined(PNG_iCCP_SUPPORTED) 2358 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2359 png_infop info_ptr, png_charp name, int compression_type, 2360 png_charp profile, png_uint_32 proflen)); 2361 /* Note to maintainer: profile should be png_bytep */ 2362 #endif 2363 2364 #if defined(PNG_sPLT_SUPPORTED) 2365 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2366 png_infop info_ptr, png_sPLT_tpp entries)); 2367 #endif 2368 2369 #if defined(PNG_sPLT_SUPPORTED) 2370 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2371 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2372 #endif 2373 2374 #if defined(PNG_TEXT_SUPPORTED) 2375 /* png_get_text also returns the number of text chunks in *num_text */ 2376 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2377 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2378 #endif 2379 2380 /* 2381 * Note while png_set_text() will accept a structure whose text, 2382 * language, and translated keywords are NULL pointers, the structure 2383 * returned by png_get_text will always contain regular 2384 * zero-terminated C strings. They might be empty strings but 2385 * they will never be NULL pointers. 2386 */ 2387 2388 #if defined(PNG_TEXT_SUPPORTED) 2389 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2390 png_infop info_ptr, png_textp text_ptr, int num_text)); 2391 #endif 2392 2393 #if defined(PNG_tIME_SUPPORTED) 2394 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2395 png_infop info_ptr, png_timep *mod_time)); 2396 #endif 2397 2398 #if defined(PNG_tIME_SUPPORTED) 2399 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2400 png_infop info_ptr, png_timep mod_time)); 2401 #endif 2402 2403 #if defined(PNG_tRNS_SUPPORTED) 2404 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2405 png_infop info_ptr, png_bytep *trans, int *num_trans, 2406 png_color_16p *trans_values)); 2407 #endif 2408 2409 #if defined(PNG_tRNS_SUPPORTED) 2410 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2411 png_infop info_ptr, png_bytep trans, int num_trans, 2412 png_color_16p trans_values)); 2413 #endif 2414 2415 #if defined(PNG_tRNS_SUPPORTED) 2416 #endif 2417 2418 #if defined(PNG_sCAL_SUPPORTED) 2419 #ifdef PNG_FLOATING_POINT_SUPPORTED 2420 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2421 png_infop info_ptr, int *unit, double *width, double *height)); 2422 #else 2423 #ifdef PNG_FIXED_POINT_SUPPORTED 2424 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2425 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2426 #endif 2427 #endif 2428 #endif /* PNG_sCAL_SUPPORTED */ 2429 2430 #if defined(PNG_sCAL_SUPPORTED) 2431 #ifdef PNG_FLOATING_POINT_SUPPORTED 2432 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2433 png_infop info_ptr, int unit, double width, double height)); 2434 #else 2435 #ifdef PNG_FIXED_POINT_SUPPORTED 2436 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2437 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2438 #endif 2439 #endif 2440 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2441 2442 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2443 /* provide a list of chunks and how they are to be handled, if the built-in 2444 handling or default unknown chunk handling is not desired. Any chunks not 2445 listed will be handled in the default manner. The IHDR and IEND chunks 2446 must not be listed. 2447 keep = 0: follow default behaviour 2448 = 1: do not keep 2449 = 2: keep only if safe-to-copy 2450 = 3: keep even if unsafe-to-copy 2451 */ 2452 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2453 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2454 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2455 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2456 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2457 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2458 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2459 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2460 #endif 2461 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2462 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2463 chunk_name)); 2464 #endif 2465 2466 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2467 If you need to turn it off for a chunk that your application has freed, 2468 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ 2469 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2470 png_infop info_ptr, int mask)); 2471 2472 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2473 /* The "params" pointer is currently not used and is for future expansion. */ 2474 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2475 png_infop info_ptr, 2476 int transforms, 2477 png_voidp params)); 2478 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2479 png_infop info_ptr, 2480 int transforms, 2481 png_voidp params)); 2482 #endif 2483 2484 /* Define PNG_DEBUG at compile time for debugging information. Higher 2485 * numbers for PNG_DEBUG mean more debugging information. This has 2486 * only been added since version 0.95 so it is not implemented throughout 2487 * libpng yet, but more support will be added as needed. 2488 */ 2489 #ifdef PNG_DEBUG 2490 #if (PNG_DEBUG > 0) 2491 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2492 #include <crtdbg.h> 2493 #if (PNG_DEBUG > 1) 2494 #define png_debug(l,m) _RPT0(_CRT_WARN,m) 2495 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) 2496 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) 2497 #endif 2498 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2499 #ifndef PNG_DEBUG_FILE 2500 #define PNG_DEBUG_FILE stderr 2501 #endif /* PNG_DEBUG_FILE */ 2502 #if (PNG_DEBUG > 1) 2503 #define png_debug(l,m) \ 2504 { \ 2505 int num_tabs=l; \ 2506 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2507 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2508 } 2509 #define png_debug1(l,m,p1) \ 2510 { \ 2511 int num_tabs=l; \ 2512 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2513 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2514 } 2515 #define png_debug2(l,m,p1,p2) \ 2516 { \ 2517 int num_tabs=l; \ 2518 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2519 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2520 } 2521 #endif /* (PNG_DEBUG > 1) */ 2522 #endif /* _MSC_VER */ 2523 #endif /* (PNG_DEBUG > 0) */ 2524 #endif /* PNG_DEBUG */ 2525 #ifndef png_debug 2526 #define png_debug(l, m) 2527 #endif 2528 #ifndef png_debug1 2529 #define png_debug1(l, m, p1) 2530 #endif 2531 #ifndef png_debug2 2532 #define png_debug2(l, m, p1, p2) 2533 #endif 2534 2535 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2536 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2537 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2538 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2539 2540 #ifdef PNG_MNG_FEATURES_SUPPORTED 2541 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2542 png_ptr, png_uint_32 mng_features_permitted)); 2543 #endif 2544 2545 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2546 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2547 #define PNG_HANDLE_CHUNK_NEVER 1 2548 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2549 #define PNG_HANDLE_CHUNK_ALWAYS 3 2550 2551 /* Added to version 1.2.0 */ 2552 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2553 #if defined(PNG_MMX_CODE_SUPPORTED) 2554 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2555 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2556 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2557 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2558 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2559 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2560 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2561 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2562 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2563 2564 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2565 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2566 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2567 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2568 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2569 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2570 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2571 2572 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2573 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2574 | PNG_MMX_READ_FLAGS \ 2575 | PNG_MMX_WRITE_FLAGS ) 2576 2577 #define PNG_SELECT_READ 1 2578 #define PNG_SELECT_WRITE 2 2579 #endif /* PNG_MMX_CODE_SUPPORTED */ 2580 2581 #if !defined(PNG_1_0_X) 2582 /* pngget.c */ 2583 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2584 PNGARG((int flag_select, int *compilerID)); 2585 2586 /* pngget.c */ 2587 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2588 PNGARG((int flag_select)); 2589 2590 /* pngget.c */ 2591 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2592 PNGARG((png_structp png_ptr)); 2593 2594 /* pngget.c */ 2595 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2596 PNGARG((png_structp png_ptr)); 2597 2598 /* pngget.c */ 2599 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2600 PNGARG((png_structp png_ptr)); 2601 2602 /* pngset.c */ 2603 extern PNG_EXPORT(void,png_set_asm_flags) 2604 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2605 2606 /* pngset.c */ 2607 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2608 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2609 png_uint_32 mmx_rowbytes_threshold)); 2610 2611 #endif /* PNG_1_0_X */ 2612 2613 #if !defined(PNG_1_0_X) 2614 /* png.c, pnggccrd.c, or pngvcrd.c */ 2615 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2616 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2617 2618 /* Strip the prepended error numbers ("#nnn ") from error and warning 2619 * messages before passing them to the error or warning handler. */ 2620 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2621 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2622 png_ptr, png_uint_32 strip_mode)); 2623 #endif 2624 2625 #endif /* PNG_1_0_X */ 2626 2627 /* Added at libpng-1.2.6 */ 2628 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2629 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2630 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2631 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2632 png_ptr)); 2633 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2634 png_ptr)); 2635 #endif 2636 2637 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ 2638 2639 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2640 /* With these routines we avoid an integer divide, which will be slower on 2641 * most machines. However, it does take more operations than the corresponding 2642 * divide method, so it may be slower on a few RISC systems. There are two 2643 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2644 * 2645 * Note that the rounding factors are NOT supposed to be the same! 128 and 2646 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2647 * standard method. 2648 * 2649 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2650 */ 2651 2652 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2653 2654 # define png_composite(composite, fg, alpha, bg) \ 2655 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2656 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2657 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2658 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2659 2660 # define png_composite_16(composite, fg, alpha, bg) \ 2661 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2662 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2663 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2664 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2665 2666 #else /* standard method using integer division */ 2667 2668 # define png_composite(composite, fg, alpha, bg) \ 2669 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2670 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2671 (png_uint_16)127) / 255) 2672 2673 # define png_composite_16(composite, fg, alpha, bg) \ 2674 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2675 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2676 (png_uint_32)32767) / (png_uint_32)65535L) 2677 2678 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2679 2680 /* Inline macros to do direct reads of bytes from the input buffer. These 2681 * require that you are using an architecture that uses PNG byte ordering 2682 * (MSB first) and supports unaligned data storage. I think that PowerPC 2683 * in big-endian mode and 680x0 are the only ones that will support this. 2684 * The x86 line of processors definitely do not. The png_get_int_32() 2685 * routine also assumes we are using two's complement format for negative 2686 * values, which is almost certainly true. 2687 */ 2688 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2689 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2690 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2691 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2692 #else 2693 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2694 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2695 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2696 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2697 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2698 PNGARG((png_structp png_ptr, png_bytep buf)); 2699 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2700 2701 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2702 */ 2703 extern PNG_EXPORT(void,png_save_uint_32) 2704 PNGARG((png_bytep buf, png_uint_32 i)); 2705 extern PNG_EXPORT(void,png_save_int_32) 2706 PNGARG((png_bytep buf, png_int_32 i)); 2707 2708 /* Place a 16-bit number into a buffer in PNG byte order. 2709 * The parameter is declared unsigned int, not png_uint_16, 2710 * just to avoid potential problems on pre-ANSI C compilers. 2711 */ 2712 extern PNG_EXPORT(void,png_save_uint_16) 2713 PNGARG((png_bytep buf, unsigned int i)); 2714 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2715 2716 /* ************************************************************************* */ 2717 2718 /* These next functions are used internally in the code. They generally 2719 * shouldn't be used unless you are writing code to add or replace some 2720 * functionality in libpng. More information about most functions can 2721 * be found in the files where the functions are located. 2722 */ 2723 2724 2725 /* Various modes of operation, that are visible to applications because 2726 * they are used for unknown chunk location. 2727 */ 2728 #define PNG_HAVE_IHDR 0x01 2729 #define PNG_HAVE_PLTE 0x02 2730 #define PNG_HAVE_IDAT 0x04 2731 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2732 #define PNG_HAVE_IEND 0x10 2733 2734 #if defined(PNG_INTERNAL) 2735 2736 /* More modes of operation. Note that after an init, mode is set to 2737 * zero automatically when the structure is created. 2738 */ 2739 #define PNG_HAVE_gAMA 0x20 2740 #define PNG_HAVE_cHRM 0x40 2741 #define PNG_HAVE_sRGB 0x80 2742 #define PNG_HAVE_CHUNK_HEADER 0x100 2743 #define PNG_WROTE_tIME 0x200 2744 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2745 #define PNG_BACKGROUND_IS_GRAY 0x800 2746 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2747 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2748 2749 /* flags for the transformations the PNG library does on the image data */ 2750 #define PNG_BGR 0x0001 2751 #define PNG_INTERLACE 0x0002 2752 #define PNG_PACK 0x0004 2753 #define PNG_SHIFT 0x0008 2754 #define PNG_SWAP_BYTES 0x0010 2755 #define PNG_INVERT_MONO 0x0020 2756 #define PNG_DITHER 0x0040 2757 #define PNG_BACKGROUND 0x0080 2758 #define PNG_BACKGROUND_EXPAND 0x0100 2759 /* 0x0200 unused */ 2760 #define PNG_16_TO_8 0x0400 2761 #define PNG_RGBA 0x0800 2762 #define PNG_EXPAND 0x1000 2763 #define PNG_GAMMA 0x2000 2764 #define PNG_GRAY_TO_RGB 0x4000 2765 #define PNG_FILLER 0x8000L 2766 #define PNG_PACKSWAP 0x10000L 2767 #define PNG_SWAP_ALPHA 0x20000L 2768 #define PNG_STRIP_ALPHA 0x40000L 2769 #define PNG_INVERT_ALPHA 0x80000L 2770 #define PNG_USER_TRANSFORM 0x100000L 2771 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2772 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2773 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2774 /* 0x800000L Unused */ 2775 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2776 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2777 /* 0x4000000L unused */ 2778 /* 0x8000000L unused */ 2779 /* 0x10000000L unused */ 2780 /* 0x20000000L unused */ 2781 /* 0x40000000L unused */ 2782 2783 /* flags for png_create_struct */ 2784 #define PNG_STRUCT_PNG 0x0001 2785 #define PNG_STRUCT_INFO 0x0002 2786 2787 /* Scaling factor for filter heuristic weighting calculations */ 2788 #define PNG_WEIGHT_SHIFT 8 2789 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2790 #define PNG_COST_SHIFT 3 2791 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2792 2793 /* flags for the png_ptr->flags rather than declaring a byte for each one */ 2794 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2795 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2796 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2797 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2798 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2799 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2800 #define PNG_FLAG_ROW_INIT 0x0040 2801 #define PNG_FLAG_FILLER_AFTER 0x0080 2802 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2803 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2804 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2805 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2806 #define PNG_FLAG_FREE_PLTE 0x1000 2807 #define PNG_FLAG_FREE_TRNS 0x2000 2808 #define PNG_FLAG_FREE_HIST 0x4000 2809 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2810 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2811 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2812 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2813 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2814 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2815 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2816 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2817 /* 0x800000L unused */ 2818 /* 0x1000000L unused */ 2819 /* 0x2000000L unused */ 2820 /* 0x4000000L unused */ 2821 /* 0x8000000L unused */ 2822 /* 0x10000000L unused */ 2823 /* 0x20000000L unused */ 2824 /* 0x40000000L unused */ 2825 2826 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2827 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2828 2829 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2830 PNG_FLAG_CRC_CRITICAL_IGNORE) 2831 2832 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2833 PNG_FLAG_CRC_CRITICAL_MASK) 2834 2835 /* save typing and make code easier to understand */ 2836 2837 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2838 abs((int)((c1).green) - (int)((c2).green)) + \ 2839 abs((int)((c1).blue) - (int)((c2).blue))) 2840 2841 /* Added to libpng-1.2.6 JB */ 2842 #define PNG_ROWBYTES(pixel_bits, width) \ 2843 ((pixel_bits) >= 8 ? \ 2844 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2845 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2846 2847 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2848 ideal-delta..ideal+delta. Each argument is evaluated twice. 2849 "ideal" and "delta" should be constants, normally simple 2850 integers, "value" a variable. Added to libpng-1.2.6 JB */ 2851 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2852 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2853 2854 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2855 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2856 /* place to hold the signature string for a PNG file. */ 2857 #ifdef PNG_USE_GLOBAL_ARRAYS 2858 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 2859 #else 2860 #endif 2861 #endif /* PNG_NO_EXTERN */ 2862 2863 /* Constant strings for known chunk types. If you need to add a chunk, 2864 * define the name here, and add an invocation of the macro in png.c and 2865 * wherever it's needed. 2866 */ 2867 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2868 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2869 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2870 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2871 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2872 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2873 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2874 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2875 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2876 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2877 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2878 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2879 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2880 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2881 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2882 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 2883 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 2884 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 2885 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 2886 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 2887 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 2888 2889 #ifdef PNG_USE_GLOBAL_ARRAYS 2890 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 2891 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 2892 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 2893 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 2894 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 2895 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 2896 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 2897 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 2898 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 2899 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 2900 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 2901 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 2902 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 2903 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 2904 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 2905 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 2906 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 2907 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 2908 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 2909 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 2910 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 2911 #endif /* PNG_USE_GLOBAL_ARRAYS */ 2912 2913 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2914 /* Initialize png_ptr struct for reading, and allocate any other memory. 2915 * (old interface - DEPRECATED - use png_create_read_struct instead). 2916 */ 2917 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 2918 #undef png_read_init 2919 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 2920 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2921 #endif 2922 2923 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 2924 png_const_charp user_png_ver, png_size_t png_struct_size)); 2925 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2926 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 2927 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2928 png_info_size)); 2929 #endif 2930 2931 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2932 /* Initialize png_ptr struct for writing, and allocate any other memory. 2933 * (old interface - DEPRECATED - use png_create_write_struct instead). 2934 */ 2935 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 2936 #undef png_write_init 2937 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 2938 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2939 #endif 2940 2941 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 2942 png_const_charp user_png_ver, png_size_t png_struct_size)); 2943 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 2944 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2945 png_info_size)); 2946 2947 /* Allocate memory for an internal libpng struct */ 2948 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 2949 2950 /* Free memory from internal libpng struct */ 2951 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 2952 2953 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 2954 malloc_fn, png_voidp mem_ptr)); 2955 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 2956 png_free_ptr free_fn, png_voidp mem_ptr)); 2957 2958 /* Free any memory that info_ptr points to and reset struct. */ 2959 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 2960 png_infop info_ptr)); 2961 2962 #ifndef PNG_1_0_X 2963 /* Function to allocate memory for zlib. */ 2964 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 2965 2966 /* Function to free memory for zlib */ 2967 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 2968 2969 #ifdef PNG_SIZE_T 2970 /* Function to convert a sizeof an item to png_sizeof item */ 2971 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 2972 #endif 2973 2974 /* Next four functions are used internally as callbacks. PNGAPI is required 2975 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ 2976 2977 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 2978 png_bytep data, png_size_t length)); 2979 2980 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2981 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 2982 png_bytep buffer, png_size_t length)); 2983 #endif 2984 2985 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 2986 png_bytep data, png_size_t length)); 2987 2988 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 2989 #if !defined(PNG_NO_STDIO) 2990 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 2991 #endif 2992 #endif 2993 #else /* PNG_1_0_X */ 2994 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2995 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 2996 png_bytep buffer, png_size_t length)); 2997 #endif 2998 #endif /* PNG_1_0_X */ 2999 3000 /* Reset the CRC variable */ 3001 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 3002 3003 /* Write the "data" buffer to whatever output you are using. */ 3004 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3005 png_size_t length)); 3006 3007 /* Read data from whatever input you are using into the "data" buffer */ 3008 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3009 png_size_t length)); 3010 3011 /* Read bytes into buf, and update png_ptr->crc */ 3012 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3013 png_size_t length)); 3014 3015 /* Decompress data in a chunk that uses compression */ 3016 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3017 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3018 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, 3019 int comp_type, png_charp chunkdata, png_size_t chunklength, 3020 png_size_t prefix_length, png_size_t *data_length)); 3021 #endif 3022 3023 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3024 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 3025 3026 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3027 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 3028 3029 /* Calculate the CRC over a section of data. Note that we are only 3030 * passing a maximum of 64K on systems that have this as a memory limit, 3031 * since this is the maximum buffer size we can specify. 3032 */ 3033 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3034 png_size_t length)); 3035 3036 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3037 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 3038 #endif 3039 3040 /* simple function to write the signature */ 3041 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 3042 3043 /* write various chunks */ 3044 3045 /* Write the IHDR chunk, and update the png_struct with the necessary 3046 * information. 3047 */ 3048 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3049 png_uint_32 height, 3050 int bit_depth, int color_type, int compression_method, int filter_method, 3051 int interlace_method)); 3052 3053 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3054 png_uint_32 num_pal)); 3055 3056 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3057 png_size_t length)); 3058 3059 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 3060 3061 #if defined(PNG_WRITE_gAMA_SUPPORTED) 3062 #ifdef PNG_FLOATING_POINT_SUPPORTED 3063 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 3064 #endif 3065 #ifdef PNG_FIXED_POINT_SUPPORTED 3066 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 3067 file_gamma)); 3068 #endif 3069 #endif 3070 3071 #if defined(PNG_WRITE_sBIT_SUPPORTED) 3072 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3073 int color_type)); 3074 #endif 3075 3076 #if defined(PNG_WRITE_cHRM_SUPPORTED) 3077 #ifdef PNG_FLOATING_POINT_SUPPORTED 3078 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3079 double white_x, double white_y, 3080 double red_x, double red_y, double green_x, double green_y, 3081 double blue_x, double blue_y)); 3082 #endif 3083 #ifdef PNG_FIXED_POINT_SUPPORTED 3084 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3085 png_fixed_point int_white_x, png_fixed_point int_white_y, 3086 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3087 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3088 png_fixed_point int_blue_y)); 3089 #endif 3090 #endif 3091 3092 #if defined(PNG_WRITE_sRGB_SUPPORTED) 3093 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3094 int intent)); 3095 #endif 3096 3097 #if defined(PNG_WRITE_iCCP_SUPPORTED) 3098 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3099 png_charp name, int compression_type, 3100 png_charp profile, int proflen)); 3101 /* Note to maintainer: profile should be png_bytep */ 3102 #endif 3103 3104 #if defined(PNG_WRITE_sPLT_SUPPORTED) 3105 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3106 png_sPLT_tp palette)); 3107 #endif 3108 3109 #if defined(PNG_WRITE_tRNS_SUPPORTED) 3110 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3111 png_color_16p values, int number, int color_type)); 3112 #endif 3113 3114 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3115 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3116 png_color_16p values, int color_type)); 3117 #endif 3118 3119 #if defined(PNG_WRITE_hIST_SUPPORTED) 3120 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3121 int num_hist)); 3122 #endif 3123 3124 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3125 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3126 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3127 png_charp key, png_charpp new_key)); 3128 #endif 3129 3130 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3131 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3132 png_charp text, png_size_t text_len)); 3133 #endif 3134 3135 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3136 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3137 png_charp text, png_size_t text_len, int compression)); 3138 #endif 3139 3140 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3141 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3142 int compression, png_charp key, png_charp lang, png_charp lang_key, 3143 png_charp text)); 3144 #endif 3145 3146 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3147 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3148 png_infop info_ptr, png_textp text_ptr, int num_text)); 3149 #endif 3150 3151 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3152 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3153 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 3154 #endif 3155 3156 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3157 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3158 png_int_32 X0, png_int_32 X1, int type, int nparams, 3159 png_charp units, png_charpp params)); 3160 #endif 3161 3162 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3163 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3164 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3165 int unit_type)); 3166 #endif 3167 3168 #if defined(PNG_WRITE_tIME_SUPPORTED) 3169 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3170 png_timep mod_time)); 3171 #endif 3172 3173 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3174 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3175 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3176 int unit, double width, double height)); 3177 #else 3178 #ifdef PNG_FIXED_POINT_SUPPORTED 3179 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3180 int unit, png_charp width, png_charp height)); 3181 #endif 3182 #endif 3183 #endif 3184 3185 /* Called when finished processing a row of data */ 3186 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3187 3188 /* Internal use only. Called before first row of data */ 3189 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3190 3191 #if defined(PNG_READ_GAMMA_SUPPORTED) 3192 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3193 #endif 3194 3195 /* combine a row of data, dealing with alpha, etc. if requested */ 3196 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3197 int mask)); 3198 3199 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3200 /* expand an interlaced row */ 3201 /* OLD pre-1.0.9 interface: 3202 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3203 png_bytep row, int pass, png_uint_32 transformations)); 3204 */ 3205 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3206 #endif 3207 3208 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3209 3210 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3211 /* grab pixels out of a row for an interlaced pass */ 3212 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3213 png_bytep row, int pass)); 3214 #endif 3215 3216 /* unfilter a row */ 3217 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3218 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 3219 3220 /* Choose the best filter to use and filter the row data */ 3221 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3222 png_row_infop row_info)); 3223 3224 /* Write out the filtered row. */ 3225 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3226 png_bytep filtered_row)); 3227 /* finish a row while reading, dealing with interlacing passes, etc. */ 3228 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3229 3230 /* initialize the row buffers, etc. */ 3231 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3232 /* optional call to update the users info structure */ 3233 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3234 png_infop info_ptr)); 3235 3236 /* these are the functions that do the transformations */ 3237 #if defined(PNG_READ_FILLER_SUPPORTED) 3238 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3239 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3240 #endif 3241 3242 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3243 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3244 png_bytep row)); 3245 #endif 3246 3247 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3248 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3249 png_bytep row)); 3250 #endif 3251 3252 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3253 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3254 png_bytep row)); 3255 #endif 3256 3257 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3258 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3259 png_bytep row)); 3260 #endif 3261 3262 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3263 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3264 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3265 png_bytep row, png_uint_32 flags)); 3266 #endif 3267 3268 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3269 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3270 #endif 3271 3272 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3273 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3274 #endif 3275 3276 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3277 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3278 row_info, png_bytep row)); 3279 #endif 3280 3281 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3282 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3283 png_bytep row)); 3284 #endif 3285 3286 #if defined(PNG_READ_PACK_SUPPORTED) 3287 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3288 #endif 3289 3290 #if defined(PNG_READ_SHIFT_SUPPORTED) 3291 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3292 png_color_8p sig_bits)); 3293 #endif 3294 3295 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3296 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3297 #endif 3298 3299 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3300 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3301 #endif 3302 3303 #if defined(PNG_READ_DITHER_SUPPORTED) 3304 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3305 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3306 3307 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3308 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3309 png_colorp palette, int num_palette)); 3310 # endif 3311 #endif 3312 3313 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3314 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3315 #endif 3316 3317 #if defined(PNG_WRITE_PACK_SUPPORTED) 3318 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3319 png_bytep row, png_uint_32 bit_depth)); 3320 #endif 3321 3322 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3323 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3324 png_color_8p bit_depth)); 3325 #endif 3326 3327 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3328 #if defined(PNG_READ_GAMMA_SUPPORTED) 3329 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3330 png_color_16p trans_values, png_color_16p background, 3331 png_color_16p background_1, 3332 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3333 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3334 png_uint_16pp gamma_16_to_1, int gamma_shift)); 3335 #else 3336 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3337 png_color_16p trans_values, png_color_16p background)); 3338 #endif 3339 #endif 3340 3341 #if defined(PNG_READ_GAMMA_SUPPORTED) 3342 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3343 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3344 int gamma_shift)); 3345 #endif 3346 3347 #if defined(PNG_READ_EXPAND_SUPPORTED) 3348 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3349 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 3350 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3351 png_bytep row, png_color_16p trans_value)); 3352 #endif 3353 3354 /* The following decodes the appropriate chunks, and does error correction, 3355 * then calls the appropriate callback for the chunk if it is valid. 3356 */ 3357 3358 /* decode the IHDR chunk */ 3359 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3360 png_uint_32 length)); 3361 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3362 png_uint_32 length)); 3363 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3364 png_uint_32 length)); 3365 3366 #if defined(PNG_READ_bKGD_SUPPORTED) 3367 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3368 png_uint_32 length)); 3369 #endif 3370 3371 #if defined(PNG_READ_cHRM_SUPPORTED) 3372 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3373 png_uint_32 length)); 3374 #endif 3375 3376 #if defined(PNG_READ_gAMA_SUPPORTED) 3377 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3378 png_uint_32 length)); 3379 #endif 3380 3381 #if defined(PNG_READ_hIST_SUPPORTED) 3382 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3383 png_uint_32 length)); 3384 #endif 3385 3386 #if defined(PNG_READ_iCCP_SUPPORTED) 3387 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3388 png_uint_32 length)); 3389 #endif /* PNG_READ_iCCP_SUPPORTED */ 3390 3391 #if defined(PNG_READ_iTXt_SUPPORTED) 3392 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3393 png_uint_32 length)); 3394 #endif 3395 3396 #if defined(PNG_READ_oFFs_SUPPORTED) 3397 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3398 png_uint_32 length)); 3399 #endif 3400 3401 #if defined(PNG_READ_pCAL_SUPPORTED) 3402 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3403 png_uint_32 length)); 3404 #endif 3405 3406 #if defined(PNG_READ_pHYs_SUPPORTED) 3407 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3408 png_uint_32 length)); 3409 #endif 3410 3411 #if defined(PNG_READ_sBIT_SUPPORTED) 3412 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3413 png_uint_32 length)); 3414 #endif 3415 3416 #if defined(PNG_READ_sCAL_SUPPORTED) 3417 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3418 png_uint_32 length)); 3419 #endif 3420 3421 #if defined(PNG_READ_sPLT_SUPPORTED) 3422 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3423 png_uint_32 length)); 3424 #endif /* PNG_READ_sPLT_SUPPORTED */ 3425 3426 #if defined(PNG_READ_sRGB_SUPPORTED) 3427 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3428 png_uint_32 length)); 3429 #endif 3430 3431 #if defined(PNG_READ_tEXt_SUPPORTED) 3432 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3433 png_uint_32 length)); 3434 #endif 3435 3436 #if defined(PNG_READ_tIME_SUPPORTED) 3437 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3438 png_uint_32 length)); 3439 #endif 3440 3441 #if defined(PNG_READ_tRNS_SUPPORTED) 3442 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3443 png_uint_32 length)); 3444 #endif 3445 3446 #if defined(PNG_READ_zTXt_SUPPORTED) 3447 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3448 png_uint_32 length)); 3449 #endif 3450 3451 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3452 png_infop info_ptr, png_uint_32 length)); 3453 3454 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3455 png_bytep chunk_name)); 3456 3457 /* handle the transformations for reading and writing */ 3458 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3459 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3460 3461 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3462 3463 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3464 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3465 png_infop info_ptr)); 3466 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3467 png_infop info_ptr)); 3468 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3469 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3470 png_uint_32 length)); 3471 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3472 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3473 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3474 png_bytep buffer, png_size_t buffer_length)); 3475 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3476 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3477 png_bytep buffer, png_size_t buffer_length)); 3478 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3479 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3480 png_infop info_ptr, png_uint_32 length)); 3481 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3482 png_infop info_ptr)); 3483 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3484 png_infop info_ptr)); 3485 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3486 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3487 png_infop info_ptr)); 3488 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3489 png_infop info_ptr)); 3490 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3491 #if defined(PNG_READ_tEXt_SUPPORTED) 3492 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3493 png_infop info_ptr, png_uint_32 length)); 3494 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3495 png_infop info_ptr)); 3496 #endif 3497 #if defined(PNG_READ_zTXt_SUPPORTED) 3498 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3499 png_infop info_ptr, png_uint_32 length)); 3500 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3501 png_infop info_ptr)); 3502 #endif 3503 #if defined(PNG_READ_iTXt_SUPPORTED) 3504 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3505 png_infop info_ptr, png_uint_32 length)); 3506 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3507 png_infop info_ptr)); 3508 #endif 3509 3510 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3511 3512 #ifdef PNG_MNG_FEATURES_SUPPORTED 3513 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3514 png_bytep row)); 3515 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3516 png_bytep row)); 3517 #endif 3518 3519 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3520 #if defined(PNG_MMX_CODE_SUPPORTED) 3521 /* png.c */ /* PRIVATE */ 3522 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3523 #endif 3524 #endif 3525 3526 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3527 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3528 png_infop info_ptr)); 3529 3530 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3531 png_infop info_ptr)); 3532 3533 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3534 png_infop info_ptr)); 3535 3536 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3537 png_infop info_ptr)); 3538 3539 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3540 png_infop info_ptr)); 3541 3542 #if defined(PNG_pHYs_SUPPORTED) 3543 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3544 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3545 #endif /* PNG_pHYs_SUPPORTED */ 3546 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3547 3548 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3549 3550 #endif /* PNG_INTERNAL */ 3551 3552 #ifdef __cplusplus 3553 } 3554 #endif 3555 3556 #endif /* PNG_VERSION_INFO_ONLY */ 3557 /* do not put anything past this line */ 3558 #endif /* PNG_H */ 3559