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These terms shall be governed by and construed in accordance with the laws 66 // of Taiwan, R.O.C., excluding its conflict of law rules. 67 // Any and all dispute arising out hereof or related hereto shall be finally 68 // settled by arbitration referred to the Chinese Arbitration Association, 69 // Taipei in accordance with the ROC Arbitration Law and the Arbitration 70 // Rules of the Association by three (3) arbitrators appointed in accordance 71 // with the said Rules. 72 // The place of arbitration shall be in Taipei, Taiwan and the language shall 73 // be English. 74 // The arbitration award shall be final and binding to both parties. 75 // 76 //****************************************************************************** 77 //<MStar Software> 78 /* png.h - header file for PNG reference library 79 * 80 * libpng version 1.2.40 - September 10, 2009 81 * Copyright (c) 1998-2009 Glenn Randers-Pehrson 82 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 83 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 84 * 85 * This code is released under the libpng license (See LICENSE, below) 86 * 87 * Authors and maintainers: 88 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 89 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 90 * libpng versions 0.97, January 1998, through 1.2.40 - September 10, 2009: Glenn 91 * See also "Contributing Authors", below. 92 * 93 * Note about libpng version numbers: 94 * 95 * Due to various miscommunications, unforeseen code incompatibilities 96 * and occasional factors outside the authors' control, version numbering 97 * on the library has not always been consistent and straightforward. 98 * The following table summarizes matters since version 0.89c, which was 99 * the first widely used release: 100 * 101 * source png.h png.h shared-lib 102 * version string MS_U32 version 103 * ------- ------ ----- ---------- 104 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 105 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 106 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 107 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 108 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 109 * 0.97c 0.97 97 2.0.97 110 * 0.98 0.98 98 2.0.98 111 * 0.99 0.99 98 2.0.99 112 * 0.99a-m 0.99 99 2.0.99 113 * 1.00 1.00 100 2.1.0 [100 should be 10000] 114 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 115 * 1.0.1 png.h string is 10001 2.1.0 116 * 1.0.1a-e identical to the 10002 from here on, the shared library 117 * 1.0.2 source version) 10002 is 2.V where V is the source code 118 * 1.0.2a-b 10003 version, except as noted. 119 * 1.0.3 10003 120 * 1.0.3a-d 10004 121 * 1.0.4 10004 122 * 1.0.4a-f 10005 123 * 1.0.5 (+ 2 patches) 10005 124 * 1.0.5a-d 10006 125 * 1.0.5e-r 10100 (not source compatible) 126 * 1.0.5s-v 10006 (not binary compatible) 127 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 128 * 1.0.6d-f 10007 (still binary incompatible) 129 * 1.0.6g 10007 130 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 131 * 1.0.6i 10007 10.6i 132 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 133 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 134 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 135 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 136 * 1.0.7 1 10007 (still compatible) 137 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 138 * 1.0.8rc1 1 10008 2.1.0.8rc1 139 * 1.0.8 1 10008 2.1.0.8 140 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 141 * 1.0.9rc1 1 10009 2.1.0.9rc1 142 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 143 * 1.0.9rc2 1 10009 2.1.0.9rc2 144 * 1.0.9 1 10009 2.1.0.9 145 * 1.0.10beta1 1 10010 2.1.0.10beta1 146 * 1.0.10rc1 1 10010 2.1.0.10rc1 147 * 1.0.10 1 10010 2.1.0.10 148 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 149 * 1.0.11rc1 1 10011 2.1.0.11rc1 150 * 1.0.11 1 10011 2.1.0.11 151 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 152 * 1.0.12rc1 2 10012 2.1.0.12rc1 153 * 1.0.12 2 10012 2.1.0.12 154 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 155 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 156 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 157 * 1.2.0rc1 3 10200 3.1.2.0rc1 158 * 1.2.0 3 10200 3.1.2.0 159 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 160 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 161 * 1.2.1 3 10201 3.1.2.1 162 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 163 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 164 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 165 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 166 * 1.0.13 10 10013 10.so.0.1.0.13 167 * 1.2.2 12 10202 12.so.0.1.2.2 168 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 169 * 1.2.3 12 10203 12.so.0.1.2.3 170 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 171 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 172 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 173 * 1.0.14 10 10014 10.so.0.1.0.14 174 * 1.2.4 13 10204 12.so.0.1.2.4 175 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 176 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 177 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 178 * 1.0.15 10 10015 10.so.0.1.0.15 179 * 1.2.5 13 10205 12.so.0.1.2.5 180 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 181 * 1.0.16 10 10016 10.so.0.1.0.16 182 * 1.2.6 13 10206 12.so.0.1.2.6 183 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 184 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 185 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 186 * 1.0.17 10 10017 10.so.0.1.0.17 187 * 1.2.7 13 10207 12.so.0.1.2.7 188 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 189 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 190 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 191 * 1.0.18 10 10018 10.so.0.1.0.18 192 * 1.2.8 13 10208 12.so.0.1.2.8 193 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 194 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 195 * 1.2.9rc1 13 10209 12.so.0.9[.0] 196 * 1.2.9 13 10209 12.so.0.9[.0] 197 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] 198 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] 199 * 1.2.10 13 10210 12.so.0.10[.0] 200 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 201 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] 202 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] 203 * 1.0.19 10 10019 10.so.0.19[.0] 204 * 1.2.11 13 10211 12.so.0.11[.0] 205 * 1.0.20 10 10020 10.so.0.20[.0] 206 * 1.2.12 13 10212 12.so.0.12[.0] 207 * 1.2.13beta1 13 10213 12.so.0.13[.0] 208 * 1.0.21 10 10021 10.so.0.21[.0] 209 * 1.2.13 13 10213 12.so.0.13[.0] 210 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] 211 * 1.0.22rc1 10 10022 10.so.0.22[.0] 212 * 1.2.14rc1 13 10214 12.so.0.14[.0] 213 * 1.0.22 10 10022 10.so.0.22[.0] 214 * 1.2.14 13 10214 12.so.0.14[.0] 215 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] 216 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] 217 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] 218 * 1.0.23 10 10023 10.so.0.23[.0] 219 * 1.2.15 13 10215 12.so.0.15[.0] 220 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] 221 * 1.2.16rc1 13 10216 12.so.0.16[.0] 222 * 1.0.24 10 10024 10.so.0.24[.0] 223 * 1.2.16 13 10216 12.so.0.16[.0] 224 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] 225 * 1.0.25rc1 10 10025 10.so.0.25[.0] 226 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] 227 * 1.0.25 10 10025 10.so.0.25[.0] 228 * 1.2.17 13 10217 12.so.0.17[.0] 229 * 1.0.26 10 10026 10.so.0.26[.0] 230 * 1.2.18 13 10218 12.so.0.18[.0] 231 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] 232 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] 233 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] 234 * 1.0.27 10 10027 10.so.0.27[.0] 235 * 1.2.19 13 10219 12.so.0.19[.0] 236 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] 237 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] 238 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] 239 * 1.0.28 10 10028 10.so.0.28[.0] 240 * 1.2.20 13 10220 12.so.0.20[.0] 241 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] 242 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] 243 * 1.0.29 10 10029 10.so.0.29[.0] 244 * 1.2.21 13 10221 12.so.0.21[.0] 245 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] 246 * 1.0.30rc1 10 10030 10.so.0.30[.0] 247 * 1.2.22rc1 13 10222 12.so.0.22[.0] 248 * 1.0.30 10 10030 10.so.0.30[.0] 249 * 1.2.22 13 10222 12.so.0.22[.0] 250 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] 251 * 1.2.23rc01 13 10223 12.so.0.23[.0] 252 * 1.2.23 13 10223 12.so.0.23[.0] 253 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] 254 * 1.2.24rc01 13 10224 12.so.0.24[.0] 255 * 1.2.24 13 10224 12.so.0.24[.0] 256 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] 257 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] 258 * 1.0.31 10 10031 10.so.0.31[.0] 259 * 1.2.25 13 10225 12.so.0.25[.0] 260 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] 261 * 1.2.26rc01 13 10226 12.so.0.26[.0] 262 * 1.2.26 13 10226 12.so.0.26[.0] 263 * 1.0.32 10 10032 10.so.0.32[.0] 264 * 1.2.27beta01-06 13 10227 12.so.0.27[.0] 265 * 1.2.27rc01 13 10227 12.so.0.27[.0] 266 * 1.0.33 10 10033 10.so.0.33[.0] 267 * 1.2.27 13 10227 12.so.0.27[.0] 268 * 1.0.34 10 10034 10.so.0.34[.0] 269 * 1.2.28 13 10228 12.so.0.28[.0] 270 * 1.2.29beta01-03 13 10229 12.so.0.29[.0] 271 * 1.2.29rc01 13 10229 12.so.0.29[.0] 272 * 1.0.35 10 10035 10.so.0.35[.0] 273 * 1.2.29 13 10229 12.so.0.29[.0] 274 * 1.0.37 10 10037 10.so.0.37[.0] 275 * 1.2.30beta01-04 13 10230 12.so.0.30[.0] 276 * 1.0.38rc01-08 10 10038 10.so.0.38[.0] 277 * 1.2.30rc01-08 13 10230 12.so.0.30[.0] 278 * 1.0.38 10 10038 10.so.0.38[.0] 279 * 1.2.30 13 10230 12.so.0.30[.0] 280 * 1.0.39rc01-03 10 10039 10.so.0.39[.0] 281 * 1.2.31rc01-03 13 10231 12.so.0.31[.0] 282 * 1.0.39 10 10039 10.so.0.39[.0] 283 * 1.2.31 13 10231 12.so.0.31[.0] 284 * 1.2.32beta01-02 13 10232 12.so.0.32[.0] 285 * 1.0.40rc01 10 10040 10.so.0.40[.0] 286 * 1.2.32rc01 13 10232 12.so.0.32[.0] 287 * 1.0.40 10 10040 10.so.0.40[.0] 288 * 1.2.32 13 10232 12.so.0.32[.0] 289 * 1.2.33beta01-02 13 10233 12.so.0.33[.0] 290 * 1.2.33rc01-02 13 10233 12.so.0.33[.0] 291 * 1.0.41rc01 10 10041 10.so.0.41[.0] 292 * 1.2.33 13 10233 12.so.0.33[.0] 293 * 1.0.41 10 10041 10.so.0.41[.0] 294 * 1.2.34beta01-07 13 10234 12.so.0.34[.0] 295 * 1.0.42rc01 10 10042 10.so.0.42[.0] 296 * 1.2.34rc01 13 10234 12.so.0.34[.0] 297 * 1.0.42 10 10042 10.so.0.42[.0] 298 * 1.2.34 13 10234 12.so.0.34[.0] 299 * 1.2.35beta01-03 13 10235 12.so.0.35[.0] 300 * 1.0.43rc01-02 10 10043 10.so.0.43[.0] 301 * 1.2.35rc01-02 13 10235 12.so.0.35[.0] 302 * 1.0.43 10 10043 10.so.0.43[.0] 303 * 1.2.35 13 10235 12.so.0.35[.0] 304 * 1.2.36beta01-05 13 10236 12.so.0.36[.0] 305 * 1.2.36rc01 13 10236 12.so.0.36[.0] 306 * 1.0.44 10 10044 10.so.0.44[.0] 307 * 1.2.36 13 10236 12.so.0.36[.0] 308 * 1.2.37beta01-03 13 10237 12.so.0.37[.0] 309 * 1.2.37rc01 13 10237 12.so.0.37[.0] 310 * 1.2.37 13 10237 12.so.0.37[.0] 311 * 1.2.45 10 10045 12.so.0.45[.0] 312 * 1.0.46 10 10046 10.so.0.46[.0] 313 * 1.2.38beta01 13 10238 12.so.0.38[.0] 314 * 1.2.38rc01-03 13 10238 12.so.0.38[.0] 315 * 1.0.47 10 10047 10.so.0.47[.0] 316 * 1.2.38 13 10238 12.so.0.38[.0] 317 * 1.2.39beta01-05 13 10239 12.so.0.39[.0] 318 * 1.2.39rc01 13 10239 12.so.0.39[.0] 319 * 1.0.48 10 10048 10.so.0.48[.0] 320 * 1.2.39 13 10239 12.so.0.39[.0] 321 * 1.2.40beta01 13 10240 12.so.0.40[.0] 322 * 1.2.40rc01 13 10240 12.so.0.40[.0] 323 * 1.0.49 10 10049 10.so.0.49[.0] 324 * 1.2.40 13 10240 12.so.0.40[.0] 325 * 326 * Henceforth the source version will match the shared-library major 327 * and minor numbers; the shared-library major version number will be 328 * used for changes in backward compatibility, as it is intended. The 329 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 330 * for applications, is an unsigned integer of the form xyyzz corresponding 331 * to the source version x.y.z (leading zeros in y and z). Beta versions 332 * were given the previous public release number plus a letter, until 333 * version 1.0.6j; from then on they were given the upcoming public 334 * release number plus "betaNN" or "rcNN". 335 * 336 * Binary incompatibility exists only when applications make direct access 337 * to the info_ptr or png_ptr members through png.h, and the compiled 338 * application is loaded with a different version of the library. 339 * 340 * DLLNUM will change each time there are forward or backward changes 341 * in binary compatibility (e.g., when a new feature is added). 342 * 343 * See libpng.txt or libpng.3 for more information. The PNG specification 344 * is available as a W3C Recommendation and as an ISO Specification, 345 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 346 */ 347 348 /* 349 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 350 * 351 * If you modify libpng you may insert additional notices immediately following 352 * this sentence. 353 * 354 * This code is released under the libpng license. 355 * 356 * libpng versions 1.2.6, August 15, 2004, through 1.2.40, September 10, 2009, are 357 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are 358 * distributed according to the same disclaimer and license as libpng-1.2.5 359 * with the following individual added to the list of Contributing Authors: 360 * 361 * Cosmin Truta 362 * 363 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 364 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 365 * distributed according to the same disclaimer and license as libpng-1.0.6 366 * with the following individuals added to the list of Contributing Authors: 367 * 368 * Simon-Pierre Cadieux 369 * Eric S. Raymond 370 * Gilles Vollant 371 * 372 * and with the following additions to the disclaimer: 373 * 374 * There is no warranty against interference with your enjoyment of the 375 * library or against infringement. There is no warranty that our 376 * efforts or the library will fulfill any of your particular purposes 377 * or needs. This library is provided with all faults, and the entire 378 * risk of satisfactory quality, performance, accuracy, and effort is with 379 * the user. 380 * 381 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 382 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 383 * distributed according to the same disclaimer and license as libpng-0.96, 384 * with the following individuals added to the list of Contributing Authors: 385 * 386 * Tom Lane 387 * Glenn Randers-Pehrson 388 * Willem van Schaik 389 * 390 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 391 * Copyright (c) 1996, 1997 Andreas Dilger 392 * Distributed according to the same disclaimer and license as libpng-0.88, 393 * with the following individuals added to the list of Contributing Authors: 394 * 395 * John Bowler 396 * Kevin Bracey 397 * Sam Bushell 398 * Magnus Holmgren 399 * Greg Roelofs 400 * Tom Tanner 401 * 402 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 403 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 404 * 405 * For the purposes of this copyright and license, "Contributing Authors" 406 * is defined as the following set of individuals: 407 * 408 * Andreas Dilger 409 * Dave Martindale 410 * Guy Eric Schalnat 411 * Paul Schmidt 412 * Tim Wegner 413 * 414 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 415 * and Group 42, Inc. disclaim all warranties, expressed or implied, 416 * including, without limitation, the warranties of merchantability and of 417 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 418 * assume no liability for direct, indirect, incidental, special, exemplary, 419 * or consequential damages, which may result from the use of the PNG 420 * Reference Library, even if advised of the possibility of such damage. 421 * 422 * Permission is hereby granted to use, copy, modify, and distribute this 423 * source code, or portions hereof, for any purpose, without fee, subject 424 * to the following restrictions: 425 * 426 * 1. The origin of this source code must not be misrepresented. 427 * 428 * 2. Altered versions must be plainly marked as such and 429 * must not be misrepresented as being the original source. 430 * 431 * 3. This Copyright notice may not be removed or altered from 432 * any source or altered source distribution. 433 * 434 * The Contributing Authors and Group 42, Inc. specifically permit, without 435 * fee, and encourage the use of this source code as a component to 436 * supporting the PNG file format in commercial products. If you use this 437 * source code in a product, acknowledgment is not required but would be 438 * appreciated. 439 */ 440 441 /* 442 * A "png_get_copyright" function is available, for convenient use in "about" 443 * boxes and the like: 444 * 445 * printf("%s",png_get_copyright(NULL)); 446 * 447 * Also, the PNG logo (in PNG format, of course) is supplied in the 448 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 449 */ 450 451 /* 452 * Libpng is OSI Certified Open Source Software. OSI Certified is a 453 * certification mark of the Open Source Initiative. 454 */ 455 456 /* 457 * The contributing authors would like to thank all those who helped 458 * with testing, bug fixes, and patience. This wouldn't have been 459 * possible without all of you. 460 * 461 * Thanks to Frank J. T. Wojcik for helping with the documentation. 462 */ 463 464 /* 465 * Y2K compliance in libpng: 466 * ========================= 467 * 468 * September 10, 2009 469 * 470 * Since the PNG Development group is an ad-hoc body, we can't make 471 * an official declaration. 472 * 473 * This is your unofficial assurance that libpng from version 0.71 and 474 * upward through 1.2.40 are Y2K compliant. It is my belief that earlier 475 * versions were also Y2K compliant. 476 * 477 * Libpng only has three year fields. One is a 2-byte unsigned integer 478 * that will hold years up to 65535. The other two hold the date in text 479 * format, and will hold years up to 9999. 480 * 481 * The integer is 482 * "png_uint_16 year" in png_time_struct. 483 * 484 * The strings are 485 * "png_charp time_buffer" in png_struct and 486 * "near_time_buffer", which is a local character string in png.c. 487 * 488 * There are seven time-related functions: 489 * png.c: png_convert_to_rfc_1123() in png.c 490 * (formerly png_convert_to_rfc_1152() in error) 491 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 492 * png_convert_from_time_t() in pngwrite.c 493 * png_get_tIME() in pngget.c 494 * png_handle_tIME() in pngrutil.c, called in pngread.c 495 * png_set_tIME() in pngset.c 496 * png_write_tIME() in pngwutil.c, called in pngwrite.c 497 * 498 * All handle dates properly in a Y2K environment. The 499 * png_convert_from_time_t() function calls gmtime() to convert from system 500 * clock time, which returns (year - 1900), which we properly convert to 501 * the full 4-digit year. There is a possibility that applications using 502 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 503 * function, or that they are incorrectly passing only a 2-digit year 504 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 505 * but this is not under our control. The libpng documentation has always 506 * stated that it works with 4-digit years, and the APIs have been 507 * documented as such. 508 * 509 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 510 * integer to hold the year, and can hold years as large as 65535. 511 * 512 * zlib, upon which libpng depends, is also Y2K compliant. It contains 513 * no date-related code. 514 * 515 * Glenn Randers-Pehrson 516 * libpng maintainer 517 * PNG Development Group 518 */ 519 520 521 522 523 524 #ifndef PNG_H 525 #define PNG_H 526 527 528 529 530 531 532 typedef struct my_png_buffer_ { 533 MS_U8 *data; 534 // MS_U32 data_len; 535 MS_U32 data_offset; 536 } my_png_buffer; 537 538 /* This is not the place to learn how to use libpng. The file libpng.txt 539 * describes how to use libpng, and the file example.c summarizes it 540 * with some code on which to build. This file is useful for looking 541 * at the actual function definitions and structure components. 542 */ 543 544 /* Version information for png.h - this should match the version in png.c */ 545 #define PNG_LIBPNG_VER_STRING "1.2.40" 546 #define PNG_HEADER_VERSION_STRING \ 547 " libpng version 1.2.40 - September 10, 2009\n" 548 549 #define PNG_LIBPNG_VER_SONUM 0 550 #define PNG_LIBPNG_VER_DLLNUM 13 551 552 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 553 #define PNG_LIBPNG_VER_MAJOR 1 554 #define PNG_LIBPNG_VER_MINOR 2 555 #define PNG_LIBPNG_VER_RELEASE 40 556 /* This should match the numeric part of the final component of 557 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 558 */ 559 560 #define PNG_LIBPNG_VER_BUILD 0 561 562 /* Release Status */ 563 #define PNG_LIBPNG_BUILD_ALPHA 1 564 #define PNG_LIBPNG_BUILD_BETA 2 565 #define PNG_LIBPNG_BUILD_RC 3 566 #define PNG_LIBPNG_BUILD_STABLE 4 567 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 568 569 /* Release-Specific Flags */ 570 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 571 PNG_LIBPNG_BUILD_STABLE only */ 572 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 573 PNG_LIBPNG_BUILD_SPECIAL */ 574 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 575 PNG_LIBPNG_BUILD_PRIVATE */ 576 577 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 578 579 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 580 * We must not include leading zeros. 581 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 582 * version 1.0.0 was mis-numbered 100 instead of 10000). From 583 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 584 */ 585 #define PNG_LIBPNG_VER 10240 /* 1.2.40 */ 586 587 #ifndef PNG_VERSION_INFO_ONLY 588 /* Include the compression library's header */ 589 #include "zlib.h" 590 #endif 591 592 /* Include all user configurable info, including optional assembler routines */ 593 #include "pngconf.h" 594 595 typedef struct PngInfoStruct 596 { 597 MS_U32 png_width,png_height; 598 MS_U8 bps,color_type; 599 MS_U8 interlace,compression,filter; 600 MS_U8 color_depth; 601 MS_U8 *palette; 602 MS_U8 *trans; 603 MS_U8 trns_en; 604 MS_U16 palette_num; 605 MS_U16 num_trans; 606 MS_U8 bpp; 607 z_stream zstream; 608 609 }PngInfo; 610 611 typedef PngInfo *PngInfop; 612 613 //PngInfop PngProcess(void *,MS_U32,MS_U32, void * ); 614 PngInfop PngProcess(void *ptr, MS_U32 ocolor, MS_U32 mode, void *roi); 615 616 /* 617 * Added at libpng-1.2.8 */ 618 /* Ref MSDN: Private as priority over Special 619 * VS_FF_PRIVATEBUILD File *was not* built using standard release 620 * procedures. If this value is given, the StringFileInfo block must 621 * contain a PrivateBuild string. 622 * 623 * VS_FF_SPECIALBUILD File *was* built by the original company using 624 * standard release procedures but is a variation of the standard 625 * file of the same version number. If this value is given, the 626 * StringFileInfo block must contain a SpecialBuild string. 627 */ 628 629 #if defined(PNG_USER_PRIVATEBUILD) 630 # define PNG_LIBPNG_BUILD_TYPE \ 631 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 632 #else 633 # if defined(PNG_LIBPNG_SPECIALBUILD) 634 # define PNG_LIBPNG_BUILD_TYPE \ 635 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 636 # else 637 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 638 # endif 639 #endif 640 641 #ifndef PNG_VERSION_INFO_ONLY 642 643 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 644 #ifdef __cplusplus 645 extern "C" { 646 #endif /* __cplusplus */ 647 648 /* This file is arranged in several sections. The first section contains 649 * structure and type definitions. The second section contains the external 650 * library functions, while the third has the internal library functions, 651 * which applications aren't expected to use directly. 652 */ 653 654 #ifndef PNG_NO_TYPECAST_NULL 655 #define int_p_NULL (MS_U32 *)NULL 656 #define png_bytep_NULL (png_bytep)NULL 657 #define png_bytepp_NULL (png_bytepp)NULL 658 #define png_doublep_NULL (png_doublep)NULL 659 #define png_error_ptr_NULL (png_error_ptr)NULL 660 #define png_flush_ptr_NULL (png_flush_ptr)NULL 661 #define png_free_ptr_NULL (png_free_ptr)NULL 662 #define png_infopp_NULL (png_infopp)NULL 663 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 664 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 665 #define png_rw_ptr_NULL (png_rw_ptr)NULL 666 #define png_structp_NULL (png_structp)NULL 667 #define png_uint_16p_NULL (png_uint_16p)NULL 668 #define png_voidp_NULL (png_voidp)NULL 669 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 670 #else 671 #define int_p_NULL NULL 672 #define png_bytep_NULL NULL 673 #define png_bytepp_NULL NULL 674 #define png_doublep_NULL NULL 675 #define png_error_ptr_NULL NULL 676 #define png_flush_ptr_NULL NULL 677 #define png_free_ptr_NULL NULL 678 #define png_infopp_NULL NULL 679 #define png_malloc_ptr_NULL NULL 680 #define png_read_status_ptr_NULL NULL 681 #define png_rw_ptr_NULL NULL 682 #define png_structp_NULL NULL 683 #define png_uint_16p_NULL NULL 684 #define png_voidp_NULL NULL 685 #define png_write_status_ptr_NULL NULL 686 #endif 687 688 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 689 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 690 /* Version information for C files, stored in png.c. This had better match 691 * the version above. 692 */ 693 #ifdef PNG_USE_GLOBAL_ARRAYS 694 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 695 /* Need room for 99.99.99beta99z */ 696 #else 697 #define png_libpng_ver png_get_header_ver(NULL) 698 #endif 699 700 #ifdef PNG_USE_GLOBAL_ARRAYS 701 /* This was removed in version 1.0.5c */ 702 /* Structures to facilitate easy interlacing. See png.c for more details */ 703 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_start[7]; 704 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_inc[7]; 705 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_ystart[7]; 706 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_yinc[7]; 707 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_mask[7]; 708 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_dsp_mask[7]; 709 /* This isn't currently used. If you need it, see png.c for more details. 710 PNG_EXPORT_VAR (PNG_CONST MS_U32 FARDATA) png_pass_height[7]; 711 */ 712 #endif 713 714 #endif /* PNG_NO_EXTERN */ 715 716 /* Three color definitions. The order of the red, green, and blue, (and the 717 * exact size) is not important, although the size of the fields need to 718 * be png_byte or png_uint_16 (as defined below). 719 */ 720 typedef struct png_color_struct 721 { 722 png_byte red; 723 png_byte green; 724 png_byte blue; 725 } png_color; 726 typedef png_color FAR * png_colorp; 727 typedef png_color FAR * FAR * png_colorpp; 728 729 typedef struct png_color_16_struct 730 { 731 png_byte index; /* used for palette files */ 732 png_uint_16 red; /* for use in red green blue files */ 733 png_uint_16 green; 734 png_uint_16 blue; 735 png_uint_16 gray; /* for use in grayscale files */ 736 } png_color_16; 737 typedef png_color_16 FAR * png_color_16p; 738 typedef png_color_16 FAR * FAR * png_color_16pp; 739 740 typedef struct png_color_8_struct 741 { 742 png_byte red; /* for use in red green blue files */ 743 png_byte green; 744 png_byte blue; 745 png_byte gray; /* for use in grayscale files */ 746 png_byte alpha; /* for alpha channel files */ 747 } png_color_8; 748 typedef png_color_8 FAR * png_color_8p; 749 typedef png_color_8 FAR * FAR * png_color_8pp; 750 751 /* 752 * The following two structures are used for the in-core representation 753 * of sPLT chunks. 754 */ 755 typedef struct png_sPLT_entry_struct 756 { 757 png_uint_16 red; 758 png_uint_16 green; 759 png_uint_16 blue; 760 png_uint_16 alpha; 761 png_uint_16 frequency; 762 } png_sPLT_entry; 763 typedef png_sPLT_entry FAR * png_sPLT_entryp; 764 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 765 766 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 767 * occupy the LSB of their respective members, and the MSB of each member 768 * is zero-filled. The frequency member always occupies the full 16 bits. 769 */ 770 771 typedef struct png_sPLT_struct 772 { 773 png_charp name; /* palette name */ 774 png_byte depth; /* depth of palette samples */ 775 png_sPLT_entryp entries; /* palette entries */ 776 png_int_32 nentries; /* number of palette entries */ 777 } png_sPLT_t; 778 typedef png_sPLT_t FAR * png_sPLT_tp; 779 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 780 781 #ifdef PNG_TEXT_SUPPORTED 782 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 783 * and whether that contents is compressed or not. The "key" field 784 * points to a regular zero-terminated C string. The "text", "lang", and 785 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 786 * However, the * structure returned by png_get_text() will always contain 787 * regular zero-terminated C strings (possibly empty), never NULL pointers, 788 * so they can be safely used in printf() and other string-handling functions. 789 */ 790 typedef struct png_text_struct 791 { 792 MS_U32 compression; /* compression value: 793 -1: tEXt, none 794 0: zTXt, deflate 795 1: iTXt, none 796 2: iTXt, deflate */ 797 png_charp key; /* keyword, 1-79 character description of "text" */ 798 png_charp text; /* comment, may be an empty string (ie "") 799 or a NULL pointer */ 800 png_size_t text_length; /* length of the text string */ 801 #ifdef PNG_iTXt_SUPPORTED 802 png_size_t itxt_length; /* length of the itxt string */ 803 png_charp lang; /* language code, 0-79 characters 804 or a NULL pointer */ 805 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 806 chars or a NULL pointer */ 807 #endif 808 } png_text; 809 typedef png_text FAR * png_textp; 810 typedef png_text FAR * FAR * png_textpp; 811 #endif 812 813 /* Supported compression types for text in PNG files (tEXt, and zTXt). 814 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 815 */ 816 #define PNG_TEXT_COMPRESSION_NONE_WR -3 817 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 818 #define PNG_TEXT_COMPRESSION_NONE -1 819 #define PNG_TEXT_COMPRESSION_zTXt 0 820 #define PNG_ITXT_COMPRESSION_NONE 1 821 #define PNG_ITXT_COMPRESSION_zTXt 2 822 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 823 824 /* png_time is a way to hold the time in an machine independent way. 825 * Two conversions are provided, both from time_t and struct tm. There 826 * is no portable way to convert to either of these structures, as far 827 * as I know. If you know of a portable way, send it to me. As a side 828 * note - PNG has always been Year 2000 compliant! 829 */ 830 typedef struct png_time_struct 831 { 832 png_uint_16 year; /* full year, as in, 1995 */ 833 png_byte month; /* month of year, 1 - 12 */ 834 png_byte day; /* day of month, 1 - 31 */ 835 png_byte hour; /* hour of day, 0 - 23 */ 836 png_byte minute; /* minute of hour, 0 - 59 */ 837 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 838 } png_time; 839 typedef png_time FAR * png_timep; 840 typedef png_time FAR * FAR * png_timepp; 841 842 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 843 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 844 /* png_unknown_chunk is a structure to hold queued chunks for which there is 845 * no specific support. The idea is that we can use this to queue 846 * up private chunks for output even though the library doesn't actually 847 * know about their semantics. 848 */ 849 #define PNG_CHUNK_NAME_LENGTH 5 850 typedef struct png_unknown_chunk_t 851 { 852 png_byte name[PNG_CHUNK_NAME_LENGTH]; 853 png_byte *data; 854 png_size_t size; 855 856 /* libpng-using applications should NOT directly modify this byte. */ 857 png_byte location; /* mode of operation at read time */ 858 } 859 png_unknown_chunk; 860 typedef png_unknown_chunk FAR * png_unknown_chunkp; 861 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 862 #endif 863 864 /* png_info is a structure that holds the information in a PNG file so 865 * that the application can find out the characteristics of the image. 866 * If you are reading the file, this structure will tell you what is 867 * in the PNG file. If you are writing the file, fill in the information 868 * you want to put into the PNG file, then call png_write_info(). 869 * The names chosen should be very close to the PNG specification, so 870 * consult that document for information about the meaning of each field. 871 * 872 * With libpng < 0.95, it was only possible to directly set and read the 873 * the values in the png_info_struct, which meant that the contents and 874 * order of the values had to remain fixed. With libpng 0.95 and later, 875 * however, there are now functions that abstract the contents of 876 * png_info_struct from the application, so this makes it easier to use 877 * libpng with dynamic libraries, and even makes it possible to use 878 * libraries that don't have all of the libpng ancillary chunk-handing 879 * functionality. 880 * 881 * In any case, the order of the parameters in png_info_struct should NOT 882 * be changed for as long as possible to keep compatibility with applications 883 * that use the old direct-access method with png_info_struct. 884 * 885 * The following members may have allocated storage attached that should be 886 * cleaned up before the structure is discarded: palette, trans, text, 887 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 888 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 889 * are automatically freed when the info structure is deallocated, if they were 890 * allocated internally by libpng. This behavior can be changed by means 891 * of the png_data_freer() function. 892 * 893 * More allocation details: all the chunk-reading functions that 894 * change these members go through the corresponding png_set_* 895 * functions. A function to clear these members is available: see 896 * png_free_data(). The png_set_* functions do not depend on being 897 * able to point info structure members to any of the storage they are 898 * passed (they make their own copies), EXCEPT that the png_set_text 899 * functions use the same storage passed to them in the text_ptr or 900 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 901 * functions do not make their own copies. 902 */ 903 typedef struct png_info_struct 904 { 905 /* The following are necessary for every PNG file */ 906 png_uint_32 width; /* width of image in pixels (from IHDR) */ 907 png_uint_32 height; /* height of image in pixels (from IHDR) */ 908 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 909 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 910 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 911 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 912 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 913 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 914 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 915 /* The following three should have been named *_method not *_type */ 916 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 917 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 918 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 919 920 /* The following is informational only on read, and not used on writes. */ 921 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 922 png_byte pixel_depth; /* number of bits per pixel */ 923 png_byte spare_byte; /* to align the data, and for future use */ 924 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 925 926 /* The rest of the data is optional. If you are reading, check the 927 * valid field to see if the information in these are valid. If you 928 * are writing, set the valid field to those chunks you want written, 929 * and initialize the appropriate fields below. 930 */ 931 932 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 933 /* The gAMA chunk describes the gamma characteristics of the system 934 * on which the image was created, normally in the range [1.0, 2.5]. 935 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 936 */ 937 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 938 #endif 939 940 #if defined(PNG_sRGB_SUPPORTED) 941 /* GR-P, 0.96a */ 942 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 943 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 944 #endif 945 946 #if defined(PNG_TEXT_SUPPORTED) 947 /* The tEXt, and zTXt chunks contain human-readable textual data in 948 * uncompressed, compressed, and optionally compressed forms, respectively. 949 * The data in "text" is an array of pointers to uncompressed, 950 * null-terminated C strings. Each chunk has a keyword that describes the 951 * textual data contained in that chunk. Keywords are not required to be 952 * unique, and the text string may be empty. Any number of text chunks may 953 * be in an image. 954 */ 955 MS_U32 num_text; /* number of comments read/to write */ 956 MS_U32 max_text; /* current size of text array */ 957 png_textp text; /* array of comments read/to write */ 958 #endif /* PNG_TEXT_SUPPORTED */ 959 960 #if defined(PNG_tIME_SUPPORTED) 961 /* The tIME chunk holds the last time the displayed image data was 962 * modified. See the png_time struct for the contents of this struct. 963 */ 964 png_time mod_time; 965 #endif 966 967 #if defined(PNG_sBIT_SUPPORTED) 968 /* The sBIT chunk specifies the number of significant high-order bits 969 * in the pixel data. Values are in the range [1, bit_depth], and are 970 * only specified for the channels in the pixel data. The contents of 971 * the low-order bits is not specified. Data is valid if 972 * (valid & PNG_INFO_sBIT) is non-zero. 973 */ 974 png_color_8 sig_bit; /* significant bits in color channels */ 975 #endif 976 977 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 978 defined(PNG_READ_BACKGROUND_SUPPORTED) 979 /* The tRNS chunk supplies transparency data for paletted images and 980 * other image types that don't need a full alpha channel. There are 981 * "num_trans" transparency values for a paletted image, stored in the 982 * same order as the palette colors, starting from index 0. Values 983 * for the data are in the range [0, 255], ranging from fully transparent 984 * to fully opaque, respectively. For non-paletted images, there is a 985 * single color specified that should be treated as fully transparent. 986 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 987 */ 988 png_bytep trans; /* transparent values for paletted image */ 989 png_color_16 trans_values; /* transparent color for non-palette image */ 990 #endif 991 992 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 993 /* The bKGD chunk gives the suggested image background color if the 994 * display program does not have its own background color and the image 995 * is needs to composited onto a background before display. The colors 996 * in "background" are normally in the same color space/depth as the 997 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 998 */ 999 png_color_16 background; 1000 #endif 1001 1002 #if defined(PNG_oFFs_SUPPORTED) 1003 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 1004 * and downwards from the top-left corner of the display, page, or other 1005 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 1006 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 1007 */ 1008 png_int_32 x_offset; /* x offset on page */ 1009 png_int_32 y_offset; /* y offset on page */ 1010 png_byte offset_unit_type; /* offset units type */ 1011 #endif 1012 1013 #if defined(PNG_pHYs_SUPPORTED) 1014 /* The pHYs chunk gives the physical pixel density of the image for 1015 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 1016 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 1017 */ 1018 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 1019 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 1020 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 1021 #endif 1022 1023 #if defined(PNG_hIST_SUPPORTED) 1024 /* The hIST chunk contains the relative frequency or importance of the 1025 * various palette entries, so that a viewer can intelligently select a 1026 * reduced-color palette, if required. Data is an array of "num_palette" 1027 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 1028 * is non-zero. 1029 */ 1030 png_uint_16p hist; 1031 #endif 1032 1033 #ifdef PNG_cHRM_SUPPORTED 1034 /* The cHRM chunk describes the CIE color characteristics of the monitor 1035 * on which the PNG was created. This data allows the viewer to do gamut 1036 * mapping of the input image to ensure that the viewer sees the same 1037 * colors in the image as the creator. Values are in the range 1038 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 1039 */ 1040 #ifdef PNG_FLOATING_POINT_SUPPORTED 1041 float x_white; 1042 float y_white; 1043 float x_red; 1044 float y_red; 1045 float x_green; 1046 float y_green; 1047 float x_blue; 1048 float y_blue; 1049 #endif 1050 #endif 1051 1052 #if defined(PNG_pCAL_SUPPORTED) 1053 /* The pCAL chunk describes a transformation between the stored pixel 1054 * values and original physical data values used to create the image. 1055 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 1056 * range given by [pcal_X0, pcal_X1], and are further transformed by a 1057 * (possibly non-linear) transformation function given by "pcal_type" 1058 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 1059 * defines below, and the PNG-Group's PNG extensions document for a 1060 * complete description of the transformations and how they should be 1061 * implemented, and for a description of the ASCII parameter strings. 1062 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 1063 */ 1064 png_charp pcal_purpose; /* pCAL chunk description string */ 1065 png_int_32 pcal_X0; /* minimum value */ 1066 png_int_32 pcal_X1; /* maximum value */ 1067 png_charp pcal_units; /* Latin-1 string giving physical units */ 1068 png_charpp pcal_params; /* ASCII strings containing parameter values */ 1069 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 1070 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 1071 #endif 1072 1073 /* New members added in libpng-1.0.6 */ 1074 #ifdef PNG_FREE_ME_SUPPORTED 1075 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1076 #endif 1077 1078 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 1079 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1080 /* Storage for unknown chunks that the library doesn't recognize. */ 1081 png_unknown_chunkp unknown_chunks; 1082 png_size_t unknown_chunks_num; 1083 #endif 1084 1085 #if defined(PNG_iCCP_SUPPORTED) 1086 /* iCCP chunk data. */ 1087 png_charp iccp_name; /* profile name */ 1088 png_charp iccp_profile; /* International Color Consortium profile data */ 1089 /* Note to maintainer: should be png_bytep */ 1090 png_uint_32 iccp_proflen; /* ICC profile data length */ 1091 png_byte iccp_compression; /* Always zero */ 1092 #endif 1093 1094 #if defined(PNG_sPLT_SUPPORTED) 1095 /* Data on sPLT chunks (there may be more than one). */ 1096 png_sPLT_tp splt_palettes; 1097 png_uint_32 splt_palettes_num; 1098 #endif 1099 1100 #if defined(PNG_sCAL_SUPPORTED) 1101 /* The sCAL chunk describes the actual physical dimensions of the 1102 * subject matter of the graphic. The chunk contains a unit specification 1103 * a byte value, and two ASCII strings representing floating-point 1104 * values. The values are width and height corresponsing to one pixel 1105 * in the image. This external representation is converted to double 1106 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1107 */ 1108 png_byte scal_unit; /* unit of physical scale */ 1109 #ifdef PNG_FLOATING_POINT_SUPPORTED 1110 double scal_pixel_width; /* width of one pixel */ 1111 double scal_pixel_height; /* height of one pixel */ 1112 #endif 1113 #ifdef PNG_FIXED_POINT_SUPPORTED 1114 png_charp scal_s_width; /* string containing height */ 1115 png_charp scal_s_height; /* string containing width */ 1116 #endif 1117 #endif 1118 1119 #if defined(PNG_INFO_IMAGE_SUPPORTED) 1120 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1121 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1122 png_bytepp row_pointers; /* the image bits */ 1123 #endif 1124 1125 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1126 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1127 #endif 1128 1129 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1130 png_fixed_point int_x_white; 1131 png_fixed_point int_y_white; 1132 png_fixed_point int_x_red; 1133 png_fixed_point int_y_red; 1134 png_fixed_point int_x_green; 1135 png_fixed_point int_y_green; 1136 png_fixed_point int_x_blue; 1137 png_fixed_point int_y_blue; 1138 #endif 1139 1140 } png_info; 1141 1142 typedef png_info FAR * png_infop; 1143 typedef png_info FAR * FAR * png_infopp; 1144 1145 /* Maximum positive integer used in PNG is (2^31)-1 */ 1146 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1147 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1148 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1149 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1150 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1151 #define PNG_MAX_UINT PNG_UINT_31_MAX 1152 #endif 1153 1154 /* These describe the color_type field in png_info. */ 1155 /* color type masks */ 1156 #define PNG_COLOR_MASK_PALETTE 1 1157 #define PNG_COLOR_MASK_COLOR 2 1158 #define PNG_COLOR_MASK_ALPHA 4 1159 1160 /* color types. Note that not all combinations are legal */ 1161 #define PNG_COLOR_TYPE_GRAY 0 1162 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1163 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1164 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1165 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1166 /* aliases */ 1167 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1168 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1169 1170 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1171 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1172 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1173 1174 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1175 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1176 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1177 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1178 1179 /* These are for the interlacing type. These values should NOT be changed. */ 1180 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1181 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1182 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1183 1184 /* These are for the oFFs chunk. These values should NOT be changed. */ 1185 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1186 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1187 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1188 1189 /* These are for the pCAL chunk. These values should NOT be changed. */ 1190 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1191 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1192 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1193 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1194 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1195 1196 /* These are for the sCAL chunk. These values should NOT be changed. */ 1197 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1198 #define PNG_SCALE_METER 1 /* meters per pixel */ 1199 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1200 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1201 1202 /* These are for the pHYs chunk. These values should NOT be changed. */ 1203 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1204 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1205 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1206 1207 /* These are for the sRGB chunk. These values should NOT be changed. */ 1208 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1209 #define PNG_sRGB_INTENT_RELATIVE 1 1210 #define PNG_sRGB_INTENT_SATURATION 2 1211 #define PNG_sRGB_INTENT_ABSOLUTE 3 1212 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1213 1214 /* This is for text chunks */ 1215 #define PNG_KEYWORD_MAX_LENGTH 79 1216 1217 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1218 #define PNG_MAX_PALETTE_LENGTH 256 1219 1220 /* These determine if an ancillary chunk's data has been successfully read 1221 * from the PNG header, or if the application has filled in the corresponding 1222 * data in the info_struct to be written into the output file. The values 1223 * of the PNG_INFO_<chunk> defines should NOT be changed. 1224 */ 1225 #define PNG_INFO_gAMA 0x0001 1226 #define PNG_INFO_sBIT 0x0002 1227 #define PNG_INFO_cHRM 0x0004 1228 #define PNG_INFO_PLTE 0x0008 1229 #define PNG_INFO_tRNS 0x0010 1230 #define PNG_INFO_bKGD 0x0020 1231 #define PNG_INFO_hIST 0x0040 1232 #define PNG_INFO_pHYs 0x0080 1233 #define PNG_INFO_oFFs 0x0100 1234 #define PNG_INFO_tIME 0x0200 1235 #define PNG_INFO_pCAL 0x0400 1236 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1237 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1238 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1239 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1240 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1241 1242 /* This is used for the transformation routines, as some of them 1243 * change these values for the row. It also should enable using 1244 * the routines for other purposes. 1245 */ 1246 typedef struct png_row_info_struct 1247 { 1248 png_uint_32 width; /* width of row */ 1249 png_uint_32 rowbytes; /* number of bytes in row */ 1250 png_byte color_type; /* color type of row */ 1251 png_byte bit_depth; /* bit depth of row */ 1252 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1253 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1254 } png_row_info; 1255 1256 typedef png_row_info FAR * png_row_infop; 1257 typedef png_row_info FAR * FAR * png_row_infopp; 1258 1259 /* These are the function types for the I/O functions and for the functions 1260 * that allow the user to override the default I/O functions with his or her 1261 * own. The png_error_ptr type should match that of user-supplied warning 1262 * and error functions, while the png_rw_ptr type should match that of the 1263 * user read/write data functions. 1264 */ 1265 typedef struct png_struct_def png_struct; 1266 typedef png_struct FAR * png_structp; 1267 1268 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1269 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1270 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1271 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1272 int)); 1273 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1274 int)); 1275 1276 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1277 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1278 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1279 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1280 png_uint_32, int)); 1281 #endif 1282 1283 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1284 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1285 defined(PNG_LEGACY_SUPPORTED) 1286 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1287 png_row_infop, png_bytep)); 1288 #endif 1289 1290 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1291 typedef MS_U32 (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1292 #endif 1293 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1294 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1295 #endif 1296 1297 /* Transform masks for the high-level interface */ 1298 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1299 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1300 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1301 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1302 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1303 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1304 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1305 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1306 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1307 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1308 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1309 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1310 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1311 /* Added to libpng-1.2.34 */ 1312 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1313 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1314 1315 /* Flags for MNG supported features */ 1316 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1317 #define PNG_FLAG_MNG_FILTER_64 0x04 1318 #define PNG_ALL_MNG_FEATURES 0x05 1319 1320 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1321 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1322 1323 /* The structure that holds the information to read and write PNG files. 1324 * The only people who need to care about what is inside of this are the 1325 * people who will be modifying the library for their own special needs. 1326 * It should NOT be accessed directly by an application, except to store 1327 * the jmp_buf. 1328 */ 1329 1330 struct png_struct_def 1331 { 1332 #ifdef PNG_SETJMP_SUPPORTED 1333 jmp_buf jmpbuf; /* used in png_error */ 1334 #endif 1335 png_error_ptr error_fn; /* function for printing errors and aborting */ 1336 png_error_ptr warning_fn; /* function for printing warnings */ 1337 png_voidp error_ptr; /* user supplied struct for error functions */ 1338 png_rw_ptr write_data_fn; /* function for writing output data */ 1339 png_rw_ptr read_data_fn; /* function for reading input data */ 1340 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1341 1342 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1343 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1344 #endif 1345 1346 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1347 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1348 #endif 1349 1350 /* These were added in libpng-1.0.2 */ 1351 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1352 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1353 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1354 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1355 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1356 png_byte user_transform_channels; /* channels in user transformed pixels */ 1357 #endif 1358 #endif 1359 1360 png_uint_32 mode; /* tells us where we are in the PNG file */ 1361 png_uint_32 flags; /* flags indicating various things to libpng */ 1362 png_uint_32 transformations; /* which transformations to perform */ 1363 1364 z_stream zstream; /* pointer to decompression structure (below) */ 1365 png_bytep zbuf; /* buffer for zlib */ 1366 png_size_t zbuf_size; /* size of zbuf */ 1367 MS_U32 zlib_level; /* holds zlib compression level */ 1368 MS_U32 zlib_method; /* holds zlib compression method */ 1369 MS_U32 zlib_window_bits; /* holds zlib compression window bits */ 1370 MS_U32 zlib_mem_level; /* holds zlib compression memory level */ 1371 MS_U32 zlib_strategy; /* holds zlib compression strategy */ 1372 1373 png_uint_32 width; /* width of image in pixels */ 1374 png_uint_32 height; /* height of image in pixels */ 1375 png_uint_32 num_rows; /* number of rows in current pass */ 1376 png_uint_32 usr_width; /* width of row at start of write */ 1377 png_uint_32 rowbytes; /* size of row in bytes */ 1378 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1379 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1380 png_uint_32 row_number; /* current row in interlace pass */ 1381 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1382 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1383 #ifndef PNG_NO_WRITE_FILTER 1384 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1385 png_bytep up_row; /* buffer to save "up" row when filtering */ 1386 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1387 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1388 #endif 1389 png_row_info row_info; /* used for transformation routines */ 1390 1391 png_uint_32 idat_size; /* current IDAT size for read */ 1392 png_uint_32 crc; /* current chunk CRC value */ 1393 png_colorp palette; /* palette from the input file */ 1394 png_uint_16 num_palette; /* number of color entries in palette */ 1395 png_uint_16 num_trans; /* number of transparency values */ 1396 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1397 png_byte compression; /* file compression type (always 0) */ 1398 png_byte filter; /* file filter type (always 0) */ 1399 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1400 png_byte pass; /* current interlace pass (0 - 6) */ 1401 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1402 png_byte color_type; /* color type of file */ 1403 png_byte bit_depth; /* bit depth of file */ 1404 png_byte usr_bit_depth; /* bit depth of users row */ 1405 png_byte pixel_depth; /* number of bits per pixel */ 1406 png_byte channels; /* number of channels in file */ 1407 png_byte usr_channels; /* channels at start of write */ 1408 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1409 1410 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1411 #ifdef PNG_LEGACY_SUPPORTED 1412 png_byte filler; /* filler byte for pixel expansion */ 1413 #else 1414 png_uint_16 filler; /* filler bytes for pixel expansion */ 1415 #endif 1416 #endif 1417 1418 #if defined(PNG_bKGD_SUPPORTED) 1419 png_byte background_gamma_type; 1420 # ifdef PNG_FLOATING_POINT_SUPPORTED 1421 float background_gamma; 1422 # endif 1423 png_color_16 background; /* background color in screen gamma space */ 1424 #if defined(PNG_READ_GAMMA_SUPPORTED) 1425 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1426 #endif 1427 #endif /* PNG_bKGD_SUPPORTED */ 1428 1429 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1430 png_flush_ptr output_flush_fn; /* Function for flushing output */ 1431 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1432 png_uint_32 flush_rows; /* number of rows written since last flush */ 1433 #endif 1434 1435 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1436 MS_U32 gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1437 #ifdef PNG_FLOATING_POINT_SUPPORTED 1438 float gamma; /* file gamma value */ 1439 float screen_gamma; /* screen gamma value (display_exponent) */ 1440 #endif 1441 #endif 1442 1443 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1444 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1445 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1446 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1447 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1448 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1449 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1450 #endif 1451 1452 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1453 png_color_8 sig_bit; /* significant bits in each available channel */ 1454 #endif 1455 1456 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1457 png_color_8 shift; /* shift for significant bit tranformation */ 1458 #endif 1459 1460 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1461 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1462 png_bytep trans; /* transparency values for paletted files */ 1463 png_color_16 trans_values; /* transparency values for non-paletted files */ 1464 #endif 1465 1466 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1467 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1468 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1469 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1470 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1471 png_progressive_end_ptr end_fn; /* called after image is complete */ 1472 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1473 png_bytep save_buffer; /* buffer for previously read data */ 1474 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1475 png_bytep current_buffer; /* buffer for recently used data */ 1476 png_uint_32 push_length; /* size of current input chunk */ 1477 png_uint_32 skip_length; /* bytes to skip in input data */ 1478 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1479 png_size_t save_buffer_max; /* total size of save_buffer */ 1480 png_size_t buffer_size; /* total amount of available input data */ 1481 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1482 MS_U32 process_mode; /* what push library is currently doing */ 1483 MS_U32 cur_palette; /* current push library palette index */ 1484 1485 # if defined(PNG_TEXT_SUPPORTED) 1486 png_size_t current_text_size; /* current size of text input data */ 1487 png_size_t current_text_left; /* how much text left to read in input */ 1488 png_charp current_text; /* current text chunk buffer */ 1489 png_charp current_text_ptr; /* current location in current_text */ 1490 # endif /* PNG_TEXT_SUPPORTED */ 1491 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1492 1493 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1494 /* for the Borland special 64K segment handler */ 1495 png_bytepp offset_table_ptr; 1496 png_bytep offset_table; 1497 png_uint_16 offset_table_number; 1498 png_uint_16 offset_table_count; 1499 png_uint_16 offset_table_count_free; 1500 #endif 1501 1502 #if defined(PNG_READ_DITHER_SUPPORTED) 1503 png_bytep palette_lookup; /* lookup table for dithering */ 1504 png_bytep dither_index; /* index translation for palette files */ 1505 #endif 1506 1507 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1508 png_uint_16p hist; /* histogram */ 1509 #endif 1510 1511 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1512 png_byte heuristic_method; /* heuristic for row filter selection */ 1513 png_byte num_prev_filters; /* number of weights for previous rows */ 1514 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1515 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1516 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1517 png_uint_16p filter_costs; /* relative filter calculation cost */ 1518 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1519 #endif 1520 1521 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1522 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1523 #endif 1524 1525 /* New members added in libpng-1.0.6 */ 1526 1527 #ifdef PNG_FREE_ME_SUPPORTED 1528 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1529 #endif 1530 1531 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1532 png_voidp user_chunk_ptr; 1533 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1534 #endif 1535 1536 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1537 MS_U32 num_chunk_list; 1538 png_bytep chunk_list; 1539 #endif 1540 1541 /* New members added in libpng-1.0.3 */ 1542 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1543 png_byte rgb_to_gray_status; 1544 /* These were changed from png_byte in libpng-1.0.6 */ 1545 png_uint_16 rgb_to_gray_red_coeff; 1546 png_uint_16 rgb_to_gray_green_coeff; 1547 png_uint_16 rgb_to_gray_blue_coeff; 1548 #endif 1549 1550 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1551 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1552 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1553 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1554 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1555 #ifdef PNG_1_0_X 1556 png_byte mng_features_permitted; 1557 #else 1558 png_uint_32 mng_features_permitted; 1559 #endif /* PNG_1_0_X */ 1560 #endif 1561 1562 /* New member added in libpng-1.0.7 */ 1563 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1564 png_fixed_point int_gamma; 1565 #endif 1566 1567 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1568 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1569 png_byte filter_type; 1570 #endif 1571 1572 #if defined(PNG_1_0_X) 1573 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1574 png_uint_32 row_buf_size; 1575 #endif 1576 1577 /* New members added in libpng-1.2.0 */ 1578 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1579 # if !defined(PNG_1_0_X) 1580 # if defined(PNG_MMX_CODE_SUPPORTED) 1581 png_byte mmx_bitdepth_threshold; 1582 png_uint_32 mmx_rowbytes_threshold; 1583 # endif 1584 png_uint_32 asm_flags; 1585 # endif 1586 #endif 1587 1588 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1589 #ifdef PNG_USER_MEM_SUPPORTED 1590 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1591 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1592 png_free_ptr free_fn; /* function for freeing memory */ 1593 #endif 1594 1595 /* New member added in libpng-1.0.13 and 1.2.0 */ 1596 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1597 1598 #if defined(PNG_READ_DITHER_SUPPORTED) 1599 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1600 png_bytep dither_sort; /* working sort array */ 1601 png_bytep index_to_palette; /* where the original index currently is */ 1602 /* in the palette */ 1603 png_bytep palette_to_index; /* which original index points to this */ 1604 /* palette color */ 1605 #endif 1606 1607 /* New members added in libpng-1.0.16 and 1.2.6 */ 1608 png_byte compression_type; 1609 1610 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1611 png_uint_32 user_width_max; 1612 png_uint_32 user_height_max; 1613 #endif 1614 1615 /* New member added in libpng-1.0.25 and 1.2.17 */ 1616 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1617 /* Storage for unknown chunk that the library doesn't recognize. */ 1618 png_unknown_chunk unknown_chunk; 1619 #endif 1620 1621 /* New members added in libpng-1.2.26 */ 1622 png_uint_32 old_big_row_buf_size, old_prev_row_size; 1623 1624 /* New member added in libpng-1.2.30 */ 1625 png_charp chunkdata; /* buffer for reading chunk data */ 1626 1627 }; 1628 1629 1630 /* This triggers a compiler error in png.c, if png.c and png.h 1631 * do not agree upon the version number. 1632 */ 1633 typedef png_structp version_1_2_40; 1634 1635 typedef png_struct FAR * FAR * png_structpp; 1636 1637 /* Here are the function definitions most commonly used. This is not 1638 * the place to find out how to use libpng. See libpng.txt for the 1639 * full explanation, see example.c for the summary. This just provides 1640 * a simple one line description of the use of each function. 1641 */ 1642 1643 /* Returns the version number of the library */ 1644 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1645 1646 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1647 * Handling more than 8 bytes from the beginning of the file is an error. 1648 */ 1649 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1650 MS_U32 num_bytes)); 1651 1652 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1653 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1654 * signature, and non-zero otherwise. Having num_to_check == 0 or 1655 * start > 7 will always fail (ie return non-zero). 1656 */ 1657 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1658 png_size_t num_to_check)); 1659 1660 /* Simple signature checking function. This is the same as calling 1661 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1662 */ 1663 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, MS_U32 num)); 1664 1665 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1666 extern PNG_EXPORT(png_structp,png_create_read_struct) 1667 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1668 png_error_ptr error_fn, png_error_ptr warn_fn)); 1669 1670 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1671 extern PNG_EXPORT(png_structp,png_create_write_struct) 1672 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1673 png_error_ptr error_fn, png_error_ptr warn_fn)); 1674 1675 #ifdef PNG_WRITE_SUPPORTED 1676 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1677 PNGARG((png_structp png_ptr)); 1678 #endif 1679 1680 #ifdef PNG_WRITE_SUPPORTED 1681 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1682 PNGARG((png_structp png_ptr, png_uint_32 size)); 1683 #endif 1684 1685 /* Reset the compression stream */ 1686 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1687 1688 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1689 #ifdef PNG_USER_MEM_SUPPORTED 1690 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1691 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1692 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1693 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1694 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1695 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1696 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1697 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1698 #endif 1699 1700 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1701 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1702 png_bytep chunk_name, png_bytep data, png_size_t length)); 1703 1704 /* Write the start of a PNG chunk - length and chunk name. */ 1705 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1706 png_bytep chunk_name, png_uint_32 length)); 1707 1708 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1709 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1710 png_bytep data, png_size_t length)); 1711 1712 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1713 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1714 1715 /* Allocate and initialize the info structure */ 1716 extern PNG_EXPORT(png_infop,png_create_info_struct) 1717 PNGARG((png_structp png_ptr)); 1718 1719 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1720 /* Initialize the info structure (old interface - DEPRECATED) */ 1721 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1722 #undef png_info_init 1723 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1724 png_sizeof(png_info)); 1725 #endif 1726 1727 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1728 png_size_t png_info_struct_size)); 1729 1730 /* Writes all the PNG information before the image. */ 1731 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1732 png_infop info_ptr)); 1733 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1734 png_infop info_ptr)); 1735 1736 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1737 /* Read the information before the actual image data. */ 1738 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1739 png_infop info_ptr)); 1740 #endif 1741 1742 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1743 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1744 PNGARG((png_structp png_ptr, png_timep ptime)); 1745 #endif 1746 1747 #if !defined(_WIN32_WCE) 1748 /* "time.h" functions are not supported on WindowsCE */ 1749 #if defined(PNG_WRITE_tIME_SUPPORTED) 1750 /* Convert from a struct tm to png_time */ 1751 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1752 struct tm FAR * ttime)); 1753 1754 /* Convert from time_t to png_time. Uses gmtime() */ 1755 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1756 time_t ttime)); 1757 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1758 #endif /* _WIN32_WCE */ 1759 1760 #if defined(PNG_READ_EXPAND_SUPPORTED) 1761 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1762 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1763 #if !defined(PNG_1_0_X) 1764 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1765 png_ptr)); 1766 #endif 1767 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1768 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1769 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1770 /* Deprecated */ 1771 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1772 #endif 1773 #endif 1774 1775 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1776 /* Use blue, green, red order for pixels. */ 1777 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1778 #endif 1779 1780 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1781 /* Expand the grayscale to 24-bit RGB if necessary. */ 1782 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1783 #endif 1784 1785 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1786 /* Reduce RGB to grayscale. */ 1787 #ifdef PNG_FLOATING_POINT_SUPPORTED 1788 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1789 MS_U32 error_action, double red, double green )); 1790 #endif 1791 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1792 MS_U32 error_action, png_fixed_point red, png_fixed_point green )); 1793 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1794 png_ptr)); 1795 #endif 1796 1797 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((MS_U32 bit_depth, 1798 png_colorp palette)); 1799 1800 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1801 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1802 #endif 1803 1804 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1805 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1806 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1807 #endif 1808 1809 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1810 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1811 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1812 #endif 1813 1814 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1815 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1816 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1817 png_uint_32 filler, MS_U32 flags)); 1818 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1819 #define PNG_FILLER_BEFORE 0 1820 #define PNG_FILLER_AFTER 1 1821 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1822 #if !defined(PNG_1_0_X) 1823 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1824 png_uint_32 filler, MS_U32 flags)); 1825 #endif 1826 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1827 1828 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1829 /* Swap bytes in 16-bit depth files. */ 1830 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1831 #endif 1832 1833 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1834 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1835 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1836 #endif 1837 1838 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1839 /* Swap packing order of pixels in bytes. */ 1840 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1841 #endif 1842 1843 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1844 /* Converts files to legal bit depths. */ 1845 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1846 png_color_8p true_bits)); 1847 #endif 1848 1849 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1850 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1851 /* Have the code handle the interlacing. Returns the number of passes. */ 1852 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1853 #endif 1854 1855 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1856 /* Invert monochrome files */ 1857 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1858 #endif 1859 1860 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1861 /* Handle alpha and tRNS by replacing with a background color. */ 1862 #ifdef PNG_FLOATING_POINT_SUPPORTED 1863 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1864 png_color_16p background_color, MS_U32 background_gamma_code, 1865 MS_U32 need_expand, double background_gamma)); 1866 #endif 1867 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1868 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1869 #define PNG_BACKGROUND_GAMMA_FILE 2 1870 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1871 #endif 1872 1873 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1874 /* Strip the second byte of information from a 16-bit depth file. */ 1875 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1876 #endif 1877 1878 #if defined(PNG_READ_DITHER_SUPPORTED) 1879 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1880 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1881 png_colorp palette, MS_U32 num_palette, MS_U32 maximum_colors, 1882 png_uint_16p histogram, MS_U32 full_dither)); 1883 #endif 1884 1885 #if defined(PNG_READ_GAMMA_SUPPORTED) 1886 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1887 #ifdef PNG_FLOATING_POINT_SUPPORTED 1888 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1889 double screen_gamma, double default_file_gamma)); 1890 #endif 1891 #endif 1892 1893 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1894 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1895 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1896 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1897 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1898 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1899 MS_U32 empty_plte_permitted)); 1900 #endif 1901 #endif 1902 1903 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1904 /* Set how many lines between output flushes - 0 for no flushing */ 1905 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, MS_U32 nrows)); 1906 /* Flush the current PNG output buffer */ 1907 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1908 #endif 1909 1910 /* Optional update palette with requested transformations */ 1911 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1912 1913 /* Optional call to update the users info structure */ 1914 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1915 png_infop info_ptr)); 1916 1917 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1918 /* Read one or more rows of image data. */ 1919 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1920 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1921 #endif 1922 1923 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1924 /* Read a row of data. */ 1925 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1926 png_bytep row, 1927 png_bytep display_row)); 1928 #endif 1929 1930 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1931 /* Read the whole image into memory at once. */ 1932 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1933 png_bytepp image)); 1934 #endif 1935 1936 /* Write a row of image data */ 1937 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1938 png_bytep row)); 1939 1940 /* Write a few rows of image data */ 1941 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1942 png_bytepp row, png_uint_32 num_rows)); 1943 1944 /* Write the image data */ 1945 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1946 png_bytepp image)); 1947 1948 /* Writes the end of the PNG file. */ 1949 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1950 png_infop info_ptr)); 1951 1952 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1953 /* Read the end of the PNG file. */ 1954 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1955 png_infop info_ptr)); 1956 #endif 1957 1958 /* Free any memory associated with the png_info_struct */ 1959 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1960 png_infopp info_ptr_ptr)); 1961 1962 /* Free any memory associated with the png_struct and the png_info_structs */ 1963 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1964 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1965 1966 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1967 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1968 png_infop end_info_ptr)); 1969 1970 /* Free any memory associated with the png_struct and the png_info_structs */ 1971 extern PNG_EXPORT(void,png_destroy_write_struct) 1972 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1973 1974 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1975 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1976 1977 /* Set the libpng method of handling chunk CRC errors */ 1978 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1979 MS_U32 crit_action, MS_U32 ancil_action)); 1980 1981 /* Values for png_set_crc_action() to say how to handle CRC errors in 1982 * ancillary and critical chunks, and whether to use the data contained 1983 * therein. Note that it is impossible to "discard" data in a critical 1984 * chunk. For versions prior to 0.90, the action was always error/quit, 1985 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1986 * chunks is warn/discard. These values should NOT be changed. 1987 * 1988 * value action:critical action:ancillary 1989 */ 1990 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1991 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1992 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1993 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1994 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1995 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1996 1997 /* These functions give the user control over the scan-line filtering in 1998 * libpng and the compression methods used by zlib. These functions are 1999 * mainly useful for testing, as the defaults should work with most users. 2000 * Those users who are tight on memory or want faster performance at the 2001 * expense of compression can modify them. See the compression library 2002 * header file (zlib.h) for an explination of the compression functions. 2003 */ 2004 2005 /* Set the filtering method(s) used by libpng. Currently, the only valid 2006 * value for "method" is 0. 2007 */ 2008 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, MS_U32 method, 2009 MS_U32 filters)); 2010 2011 /* Flags for png_set_filter() to say which filters to use. The flags 2012 * are chosen so that they don't conflict with real filter types 2013 * below, in case they are supplied instead of the #defined constants. 2014 * These values should NOT be changed. 2015 */ 2016 #define PNG_NO_FILTERS 0x00 2017 #define PNG_FILTER_NONE 0x08 2018 #define PNG_FILTER_SUB 0x10 2019 #define PNG_FILTER_UP 0x20 2020 #define PNG_FILTER_AVG 0x40 2021 #define PNG_FILTER_PAETH 0x80 2022 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 2023 PNG_FILTER_AVG | PNG_FILTER_PAETH) 2024 2025 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 2026 * These defines should NOT be changed. 2027 */ 2028 #define PNG_FILTER_VALUE_NONE 0 2029 #define PNG_FILTER_VALUE_SUB 1 2030 #define PNG_FILTER_VALUE_UP 2 2031 #define PNG_FILTER_VALUE_AVG 3 2032 #define PNG_FILTER_VALUE_PAETH 4 2033 #define PNG_FILTER_VALUE_LAST 5 2034 2035 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 2036 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 2037 * defines, either the default (minimum-sum-of-absolute-differences), or 2038 * the experimental method (weighted-minimum-sum-of-absolute-differences). 2039 * 2040 * Weights are factors >= 1.0, indicating how important it is to keep the 2041 * filter type consistent between rows. Larger numbers mean the current 2042 * filter is that many times as likely to be the same as the "num_weights" 2043 * previous filters. This is cumulative for each previous row with a weight. 2044 * There needs to be "num_weights" values in "filter_weights", or it can be 2045 * NULL if the weights aren't being specified. Weights have no influence on 2046 * the selection of the first row filter. Well chosen weights can (in theory) 2047 * improve the compression for a given image. 2048 * 2049 * Costs are factors >= 1.0 indicating the relative decoding costs of a 2050 * filter type. Higher costs indicate more decoding expense, and are 2051 * therefore less likely to be selected over a filter with lower computational 2052 * costs. There needs to be a value in "filter_costs" for each valid filter 2053 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 2054 * setting the costs. Costs try to improve the speed of decompression without 2055 * unduly increasing the compressed image size. 2056 * 2057 * A negative weight or cost indicates the default value is to be used, and 2058 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 2059 * The default values for both weights and costs are currently 1.0, but may 2060 * change if good general weighting/cost heuristics can be found. If both 2061 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 2062 * to the UNWEIGHTED method, but with added encoding time/computation. 2063 */ 2064 #ifdef PNG_FLOATING_POINT_SUPPORTED 2065 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 2066 MS_U32 heuristic_method, MS_U32 num_weights, png_doublep filter_weights, 2067 png_doublep filter_costs)); 2068 #endif 2069 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 2070 2071 /* Heuristic used for row filter selection. These defines should NOT be 2072 * changed. 2073 */ 2074 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 2075 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 2076 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 2077 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 2078 2079 /* Set the library compression level. Currently, valid values range from 2080 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2081 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2082 * shown that zlib compression levels 3-6 usually perform as well as level 9 2083 * for PNG images, and do considerably fewer caclulations. In the future, 2084 * these values may not correspond directly to the zlib compression levels. 2085 */ 2086 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2087 MS_U32 level)); 2088 2089 extern PNG_EXPORT(void,png_set_compression_mem_level) 2090 PNGARG((png_structp png_ptr, MS_U32 mem_level)); 2091 2092 extern PNG_EXPORT(void,png_set_compression_strategy) 2093 PNGARG((png_structp png_ptr, MS_U32 strategy)); 2094 2095 extern PNG_EXPORT(void,png_set_compression_window_bits) 2096 PNGARG((png_structp png_ptr, MS_U32 window_bits)); 2097 2098 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2099 MS_U32 method)); 2100 2101 /* These next functions are called for input/output, memory, and error 2102 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2103 * and call standard C I/O routines such as fread(), fwrite(), and 2104 * fprintf(). These functions can be made to use other I/O routines 2105 * at run time for those applications that need to handle I/O in a 2106 * different manner by calling png_set_???_fn(). See libpng.txt for 2107 * more information. 2108 */ 2109 2110 #if !defined(PNG_NO_STDIO) 2111 /* Initialize the input/output for the PNG file to the default functions. */ 2112 //extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2113 #endif 2114 2115 /* Replace the (error and abort), and warning functions with user 2116 * supplied functions. If no messages are to be printed you must still 2117 * write and use replacement functions. The replacement error_fn should 2118 * still do a longjmp to the last setjmp location if you are using this 2119 * method of error handling. If error_fn or warning_fn is NULL, the 2120 * default function will be used. 2121 */ 2122 2123 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2124 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2125 2126 /* Return the user pointer associated with the error functions */ 2127 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2128 2129 /* Replace the default data output functions with a user supplied one(s). 2130 * If buffered output is not used, then output_flush_fn can be set to NULL. 2131 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2132 * output_flush_fn will be ignored (and thus can be NULL). 2133 * It is probably a mistake to use NULL for output_flush_fn if 2134 * write_data_fn is not also NULL unless you have built libpng with 2135 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2136 * default flush function, which uses the standard *FILE structure, will 2137 * be used. 2138 */ 2139 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2140 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2141 2142 /* Replace the default data input function with a user supplied one. */ 2143 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2144 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2145 2146 /* Return the user pointer associated with the I/O functions */ 2147 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2148 2149 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2150 png_read_status_ptr read_row_fn)); 2151 2152 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2153 png_write_status_ptr write_row_fn)); 2154 2155 #ifdef PNG_USER_MEM_SUPPORTED 2156 /* Replace the default memory allocation functions with user supplied one(s). */ 2157 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2158 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2159 /* Return the user pointer associated with the memory functions */ 2160 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2161 #endif 2162 2163 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2164 defined(PNG_LEGACY_SUPPORTED) 2165 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2166 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2167 #endif 2168 2169 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2170 defined(PNG_LEGACY_SUPPORTED) 2171 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2172 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2173 #endif 2174 2175 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2176 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2177 defined(PNG_LEGACY_SUPPORTED) 2178 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2179 png_ptr, png_voidp user_transform_ptr, MS_U32 user_transform_depth, 2180 MS_U32 user_transform_channels)); 2181 /* Return the user pointer associated with the user transform functions */ 2182 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2183 PNGARG((png_structp png_ptr)); 2184 #endif 2185 2186 #ifdef PNG_USER_CHUNKS_SUPPORTED 2187 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2188 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2189 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2190 png_ptr)); 2191 #endif 2192 2193 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2194 /* Sets the function callbacks for the push reader, and a pointer to a 2195 * user-defined structure available to the callback functions. 2196 */ 2197 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2198 png_voidp progressive_ptr, 2199 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2200 png_progressive_end_ptr end_fn)); 2201 2202 /* Returns the user pointer associated with the push read functions */ 2203 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2204 PNGARG((png_structp png_ptr)); 2205 2206 /* Function to be called when data becomes available */ 2207 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2208 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2209 2210 /* Function that combines rows. Not very much different than the 2211 * png_combine_row() call. Is this even used????? 2212 */ 2213 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2214 png_bytep old_row, png_bytep new_row)); 2215 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2216 2217 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2218 png_uint_32 size)); 2219 2220 #if defined(PNG_1_0_X) 2221 # define png_malloc_warn png_malloc 2222 #else 2223 /* Added at libpng version 1.2.4 */ 2224 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2225 png_uint_32 size)); 2226 #endif 2227 2228 /* Frees a pointer allocated by png_malloc() */ 2229 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2230 2231 #if defined(PNG_1_0_X) 2232 /* Function to allocate memory for zlib. */ 2233 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2234 uInt size)); 2235 2236 /* Function to free memory for zlib */ 2237 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2238 #endif 2239 2240 /* Free data that was allocated internally */ 2241 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2242 png_infop info_ptr, png_uint_32 free_me, MS_U32 num)); 2243 #ifdef PNG_FREE_ME_SUPPORTED 2244 /* Reassign responsibility for freeing existing data, whether allocated 2245 * by libpng or by the application 2246 */ 2247 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2248 png_infop info_ptr, MS_U32 freer, png_uint_32 mask)); 2249 #endif 2250 /* Assignments for png_data_freer */ 2251 #define PNG_DESTROY_WILL_FREE_DATA 1 2252 #define PNG_SET_WILL_FREE_DATA 1 2253 #define PNG_USER_WILL_FREE_DATA 2 2254 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2255 #define PNG_FREE_HIST 0x0008 2256 #define PNG_FREE_ICCP 0x0010 2257 #define PNG_FREE_SPLT 0x0020 2258 #define PNG_FREE_ROWS 0x0040 2259 #define PNG_FREE_PCAL 0x0080 2260 #define PNG_FREE_SCAL 0x0100 2261 #define PNG_FREE_UNKN 0x0200 2262 #define PNG_FREE_LIST 0x0400 2263 #define PNG_FREE_PLTE 0x1000 2264 #define PNG_FREE_TRNS 0x2000 2265 #define PNG_FREE_TEXT 0x4000 2266 #define PNG_FREE_ALL 0x7fff 2267 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2268 2269 #ifdef PNG_USER_MEM_SUPPORTED 2270 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2271 png_uint_32 size)); 2272 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2273 png_voidp ptr)); 2274 #endif 2275 2276 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2277 png_voidp s1, png_voidp s2, png_uint_32 size)); 2278 2279 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2280 png_voidp s1, MS_U32 value, png_uint_32 size)); 2281 2282 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2283 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2284 MS_U32 check)); 2285 #endif /* USE_FAR_KEYWORD */ 2286 2287 #ifndef PNG_NO_ERROR_TEXT 2288 /* Fatal error in PNG image of libpng - can't continue */ 2289 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2290 png_const_charp error_message)); 2291 2292 /* The same, but the chunk name is prepended to the error string. */ 2293 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2294 png_const_charp error_message)); 2295 #else 2296 /* Fatal error in PNG image of libpng - can't continue */ 2297 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); 2298 #endif 2299 2300 #ifndef PNG_NO_WARNINGS 2301 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2302 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2303 png_const_charp warning_message)); 2304 2305 #ifdef PNG_READ_SUPPORTED 2306 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2307 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2308 png_const_charp warning_message)); 2309 #endif /* PNG_READ_SUPPORTED */ 2310 #endif /* PNG_NO_WARNINGS */ 2311 2312 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2313 * Similarly, the png_get_<chunk> calls are used to read values from the 2314 * png_info_struct, either storing the parameters in the passed variables, or 2315 * setting pointers into the png_info_struct where the data is stored. The 2316 * png_get_<chunk> functions return a non-zero value if the data was available 2317 * in info_ptr, or return zero and do not change any of the parameters if the 2318 * data was not available. 2319 * 2320 * These functions should be used instead of directly accessing png_info 2321 * to avoid problems with future changes in the size and internal layout of 2322 * png_info_struct. 2323 */ 2324 /* Returns "flag" if chunk data is valid in info_ptr. */ 2325 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2326 png_infop info_ptr, png_uint_32 flag)); 2327 2328 /* Returns number of bytes needed to hold a transformed row. */ 2329 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2330 png_infop info_ptr)); 2331 2332 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2333 /* Returns row_pointers, which is an array of pointers to scanlines that was 2334 * returned from png_read_png(). 2335 */ 2336 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2337 png_infop info_ptr)); 2338 /* Set row_pointers, which is an array of pointers to scanlines for use 2339 * by png_write_png(). 2340 */ 2341 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2342 png_infop info_ptr, png_bytepp row_pointers)); 2343 #endif 2344 2345 /* Returns number of color channels in image. */ 2346 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2347 png_infop info_ptr)); 2348 2349 #ifdef PNG_EASY_ACCESS_SUPPORTED 2350 /* Returns image width in pixels. */ 2351 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2352 png_ptr, png_infop info_ptr)); 2353 2354 /* Returns image height in pixels. */ 2355 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2356 png_ptr, png_infop info_ptr)); 2357 2358 /* Returns image bit_depth. */ 2359 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2360 png_ptr, png_infop info_ptr)); 2361 2362 /* Returns image color_type. */ 2363 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2364 png_ptr, png_infop info_ptr)); 2365 2366 /* Returns image filter_type. */ 2367 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2368 png_ptr, png_infop info_ptr)); 2369 2370 /* Returns image interlace_type. */ 2371 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2372 png_ptr, png_infop info_ptr)); 2373 2374 /* Returns image compression_type. */ 2375 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2376 png_ptr, png_infop info_ptr)); 2377 2378 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2379 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2380 png_ptr, png_infop info_ptr)); 2381 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2382 png_ptr, png_infop info_ptr)); 2383 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2384 png_ptr, png_infop info_ptr)); 2385 2386 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2387 #ifdef PNG_FLOATING_POINT_SUPPORTED 2388 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2389 png_ptr, png_infop info_ptr)); 2390 #endif 2391 2392 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2393 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2394 png_ptr, png_infop info_ptr)); 2395 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2396 png_ptr, png_infop info_ptr)); 2397 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2398 png_ptr, png_infop info_ptr)); 2399 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2400 png_ptr, png_infop info_ptr)); 2401 2402 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2403 2404 /* Returns pointer to signature string read from PNG header */ 2405 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2406 png_infop info_ptr)); 2407 2408 #if defined(PNG_bKGD_SUPPORTED) 2409 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2410 png_infop info_ptr, png_color_16p *background)); 2411 #endif 2412 2413 #if defined(PNG_bKGD_SUPPORTED) 2414 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2415 png_infop info_ptr, png_color_16p background)); 2416 #endif 2417 2418 #if defined(PNG_cHRM_SUPPORTED) 2419 #ifdef PNG_FLOATING_POINT_SUPPORTED 2420 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2421 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2422 double *red_y, double *green_x, double *green_y, double *blue_x, 2423 double *blue_y)); 2424 #endif 2425 #ifdef PNG_FIXED_POINT_SUPPORTED 2426 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2427 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2428 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2429 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2430 *int_blue_x, png_fixed_point *int_blue_y)); 2431 #endif 2432 #endif 2433 2434 #if defined(PNG_cHRM_SUPPORTED) 2435 #ifdef PNG_FLOATING_POINT_SUPPORTED 2436 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2437 png_infop info_ptr, double white_x, double white_y, double red_x, 2438 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2439 #endif 2440 #ifdef PNG_FIXED_POINT_SUPPORTED 2441 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2442 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2443 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2444 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2445 png_fixed_point int_blue_y)); 2446 #endif 2447 #endif 2448 2449 #if defined(PNG_gAMA_SUPPORTED) 2450 #ifdef PNG_FLOATING_POINT_SUPPORTED 2451 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2452 png_infop info_ptr, double *file_gamma)); 2453 #endif 2454 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2455 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2456 #endif 2457 2458 #if defined(PNG_gAMA_SUPPORTED) 2459 #ifdef PNG_FLOATING_POINT_SUPPORTED 2460 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2461 png_infop info_ptr, double file_gamma)); 2462 #endif 2463 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2464 png_infop info_ptr, png_fixed_point int_file_gamma)); 2465 #endif 2466 2467 #if defined(PNG_hIST_SUPPORTED) 2468 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2469 png_infop info_ptr, png_uint_16p *hist)); 2470 #endif 2471 2472 #if defined(PNG_hIST_SUPPORTED) 2473 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2474 png_infop info_ptr, png_uint_16p hist)); 2475 #endif 2476 2477 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2478 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2479 MS_U32 *bit_depth, MS_U32 *color_type, MS_U32 *interlace_method, 2480 MS_U32 *compression_method, MS_U32 *filter_method)); 2481 2482 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2483 png_infop info_ptr, png_uint_32 width, png_uint_32 height, MS_U32 bit_depth, 2484 MS_U32 color_type, MS_U32 interlace_method, MS_U32 compression_method, 2485 MS_U32 filter_method)); 2486 2487 #if defined(PNG_oFFs_SUPPORTED) 2488 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2489 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2490 MS_U32 *unit_type)); 2491 #endif 2492 2493 #if defined(PNG_oFFs_SUPPORTED) 2494 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2495 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2496 MS_U32 unit_type)); 2497 #endif 2498 2499 #if defined(PNG_pCAL_SUPPORTED) 2500 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2501 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2502 MS_U32 *type, MS_U32 *nparams, png_charp *units, png_charpp *params)); 2503 #endif 2504 2505 #if defined(PNG_pCAL_SUPPORTED) 2506 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2507 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2508 MS_U32 type, MS_U32 nparams, png_charp units, png_charpp params)); 2509 #endif 2510 2511 #if defined(PNG_pHYs_SUPPORTED) 2512 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2513 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, MS_U32 *unit_type)); 2514 #endif 2515 2516 #if defined(PNG_pHYs_SUPPORTED) 2517 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2518 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, MS_U32 unit_type)); 2519 #endif 2520 2521 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2522 png_infop info_ptr, png_colorp *palette, MS_U32 *num_palette)); 2523 2524 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2525 png_infop info_ptr, png_colorp palette, MS_U32 num_palette)); 2526 2527 #if defined(PNG_sBIT_SUPPORTED) 2528 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2529 png_infop info_ptr, png_color_8p *sig_bit)); 2530 #endif 2531 2532 #if defined(PNG_sBIT_SUPPORTED) 2533 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2534 png_infop info_ptr, png_color_8p sig_bit)); 2535 #endif 2536 2537 #if defined(PNG_sRGB_SUPPORTED) 2538 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2539 png_infop info_ptr, MS_U32 *intent)); 2540 #endif 2541 2542 #if defined(PNG_sRGB_SUPPORTED) 2543 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2544 png_infop info_ptr, MS_U32 intent)); 2545 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2546 png_infop info_ptr, MS_U32 intent)); 2547 #endif 2548 2549 #if defined(PNG_iCCP_SUPPORTED) 2550 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2551 png_infop info_ptr, png_charpp name, MS_U32 *compression_type, 2552 png_charpp profile, png_uint_32 *proflen)); 2553 /* Note to maintainer: profile should be png_bytepp */ 2554 #endif 2555 2556 #if defined(PNG_iCCP_SUPPORTED) 2557 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2558 png_infop info_ptr, png_charp name, MS_U32 compression_type, 2559 png_charp profile, png_uint_32 proflen)); 2560 /* Note to maintainer: profile should be png_bytep */ 2561 #endif 2562 2563 #if defined(PNG_sPLT_SUPPORTED) 2564 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2565 png_infop info_ptr, png_sPLT_tpp entries)); 2566 #endif 2567 2568 #if defined(PNG_sPLT_SUPPORTED) 2569 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2570 png_infop info_ptr, png_sPLT_tp entries, MS_U32 nentries)); 2571 #endif 2572 2573 #if defined(PNG_TEXT_SUPPORTED) 2574 /* png_get_text also returns the number of text chunks in *num_text */ 2575 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2576 png_infop info_ptr, png_textp *text_ptr, MS_U32 *num_text)); 2577 #endif 2578 2579 /* 2580 * Note while png_set_text() will accept a structure whose text, 2581 * language, and translated keywords are NULL pointers, the structure 2582 * returned by png_get_text will always contain regular 2583 * zero-terminated C strings. They might be empty strings but 2584 * they will never be NULL pointers. 2585 */ 2586 2587 #if defined(PNG_TEXT_SUPPORTED) 2588 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2589 png_infop info_ptr, png_textp text_ptr, MS_U32 num_text)); 2590 #endif 2591 2592 #if defined(PNG_tIME_SUPPORTED) 2593 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2594 png_infop info_ptr, png_timep *mod_time)); 2595 #endif 2596 2597 #if defined(PNG_tIME_SUPPORTED) 2598 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2599 png_infop info_ptr, png_timep mod_time)); 2600 #endif 2601 2602 #if defined(PNG_tRNS_SUPPORTED) 2603 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2604 png_infop info_ptr, png_bytep *trans, MS_U32 *num_trans, 2605 png_color_16p *trans_values)); 2606 #endif 2607 2608 #if defined(PNG_tRNS_SUPPORTED) 2609 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2610 png_infop info_ptr, png_bytep trans, MS_U32 num_trans, 2611 png_color_16p trans_values)); 2612 #endif 2613 2614 #if defined(PNG_tRNS_SUPPORTED) 2615 #endif 2616 2617 #if defined(PNG_sCAL_SUPPORTED) 2618 #ifdef PNG_FLOATING_POINT_SUPPORTED 2619 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2620 png_infop info_ptr, MS_U32 *unit, double *width, double *height)); 2621 #else 2622 #ifdef PNG_FIXED_POINT_SUPPORTED 2623 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2624 png_infop info_ptr, MS_U32 *unit, png_charpp swidth, png_charpp sheight)); 2625 #endif 2626 #endif 2627 #endif /* PNG_sCAL_SUPPORTED */ 2628 2629 #if defined(PNG_sCAL_SUPPORTED) 2630 #ifdef PNG_FLOATING_POINT_SUPPORTED 2631 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2632 png_infop info_ptr, MS_U32 unit, double width, double height)); 2633 #else 2634 #ifdef PNG_FIXED_POINT_SUPPORTED 2635 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2636 png_infop info_ptr, MS_U32 unit, png_charp swidth, png_charp sheight)); 2637 #endif 2638 #endif 2639 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2640 2641 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2642 /* Provide a list of chunks and how they are to be handled, if the built-in 2643 handling or default unknown chunk handling is not desired. Any chunks not 2644 listed will be handled in the default manner. The IHDR and IEND chunks 2645 must not be listed. 2646 keep = 0: follow default behaviour 2647 = 1: do not keep 2648 = 2: keep only if safe-to-copy 2649 = 3: keep even if unsafe-to-copy 2650 */ 2651 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2652 png_ptr, MS_U32 keep, png_bytep chunk_list, MS_U32 num_chunks)); 2653 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2654 chunk_name)); 2655 #endif 2656 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2657 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2658 png_infop info_ptr, png_unknown_chunkp unknowns, MS_U32 num_unknowns)); 2659 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2660 PNGARG((png_structp png_ptr, png_infop info_ptr, MS_U32 chunk, MS_U32 location)); 2661 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2662 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2663 #endif 2664 2665 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2666 * If you need to turn it off for a chunk that your application has freed, 2667 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2668 */ 2669 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2670 png_infop info_ptr, MS_U32 mask)); 2671 2672 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2673 /* The "params" pointer is currently not used and is for future expansion. */ 2674 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2675 png_infop info_ptr, 2676 MS_U32 transforms, 2677 png_voidp params)); 2678 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2679 png_infop info_ptr, 2680 MS_U32 transforms, 2681 png_voidp params)); 2682 #endif 2683 2684 /* Define PNG_DEBUG at compile time for debugging information. Higher 2685 * numbers for PNG_DEBUG mean more debugging information. This has 2686 * only been added since version 0.95 so it is not implemented throughout 2687 * libpng yet, but more support will be added as needed. 2688 */ 2689 #ifdef PNG_DEBUG 2690 #if (PNG_DEBUG > 0) 2691 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2692 #include <crtdbg.h> 2693 #if (PNG_DEBUG > 1) 2694 #ifndef _DEBUG 2695 # define _DEBUG 2696 #endif 2697 #ifndef png_debug 2698 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2699 #endif 2700 #ifndef png_debug1 2701 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2702 #endif 2703 #ifndef png_debug2 2704 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2705 #endif 2706 #endif 2707 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2708 #ifndef PNG_DEBUG_FILE 2709 #define PNG_DEBUG_FILE stderr 2710 #endif /* PNG_DEBUG_FILE */ 2711 2712 #if (PNG_DEBUG > 1) 2713 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2714 * compilers. 2715 */ 2716 # ifdef __STDC__ 2717 # ifndef png_debug 2718 # define png_debug(l,m) \ 2719 { \ 2720 MS_U32 num_tabs=l; \ 2721 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2722 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2723 } 2724 # endif 2725 # ifndef png_debug1 2726 # define png_debug1(l,m,p1) \ 2727 { \ 2728 MS_U32 num_tabs=l; \ 2729 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2730 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2731 } 2732 # endif 2733 # ifndef png_debug2 2734 # define png_debug2(l,m,p1,p2) \ 2735 { \ 2736 MS_U32 num_tabs=l; \ 2737 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2738 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2739 } 2740 # endif 2741 # else /* __STDC __ */ 2742 # ifndef png_debug 2743 # define png_debug(l,m) \ 2744 { \ 2745 MS_U32 num_tabs=l; \ 2746 char format[256]; \ 2747 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2748 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2749 m,PNG_STRING_NEWLINE); \ 2750 fprintf(PNG_DEBUG_FILE,format); \ 2751 } 2752 # endif 2753 # ifndef png_debug1 2754 # define png_debug1(l,m,p1) \ 2755 { \ 2756 MS_U32 num_tabs=l; \ 2757 char format[256]; \ 2758 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2759 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2760 m,PNG_STRING_NEWLINE); \ 2761 fprintf(PNG_DEBUG_FILE,format,p1); \ 2762 } 2763 # endif 2764 # ifndef png_debug2 2765 # define png_debug2(l,m,p1,p2) \ 2766 { \ 2767 MS_U32 num_tabs=l; \ 2768 char format[256]; \ 2769 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2770 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2771 m,PNG_STRING_NEWLINE); \ 2772 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2773 } 2774 # endif 2775 # endif /* __STDC __ */ 2776 #endif /* (PNG_DEBUG > 1) */ 2777 2778 #endif /* _MSC_VER */ 2779 #endif /* (PNG_DEBUG > 0) */ 2780 #endif /* PNG_DEBUG */ 2781 #ifndef png_debug 2782 #define png_debug(l, m) 2783 #endif 2784 #ifndef png_debug1 2785 #define png_debug1(l, m, p1) 2786 #endif 2787 #ifndef png_debug2 2788 #define png_debug2(l, m, p1, p2) 2789 #endif 2790 2791 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2792 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2793 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2794 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2795 2796 #ifdef PNG_MNG_FEATURES_SUPPORTED 2797 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2798 png_ptr, png_uint_32 mng_features_permitted)); 2799 #endif 2800 2801 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2802 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2803 #define PNG_HANDLE_CHUNK_NEVER 1 2804 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2805 #define PNG_HANDLE_CHUNK_ALWAYS 3 2806 2807 /* Added to version 1.2.0 */ 2808 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2809 #if defined(PNG_MMX_CODE_SUPPORTED) 2810 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2811 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2812 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2813 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2814 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2815 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2816 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2817 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2818 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2819 2820 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2821 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2822 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2823 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2824 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2825 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2826 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2827 2828 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2829 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2830 | PNG_MMX_READ_FLAGS \ 2831 | PNG_MMX_WRITE_FLAGS ) 2832 2833 #define PNG_SELECT_READ 1 2834 #define PNG_SELECT_WRITE 2 2835 #endif /* PNG_MMX_CODE_SUPPORTED */ 2836 2837 #if !defined(PNG_1_0_X) 2838 /* pngget.c */ 2839 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2840 PNGARG((MS_U32 flag_select, MS_U32 *compilerID)); 2841 2842 /* pngget.c */ 2843 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2844 PNGARG((MS_U32 flag_select)); 2845 2846 /* pngget.c */ 2847 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2848 PNGARG((png_structp png_ptr)); 2849 2850 /* pngget.c */ 2851 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2852 PNGARG((png_structp png_ptr)); 2853 2854 /* pngget.c */ 2855 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2856 PNGARG((png_structp png_ptr)); 2857 2858 /* pngset.c */ 2859 extern PNG_EXPORT(void,png_set_asm_flags) 2860 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2861 2862 /* pngset.c */ 2863 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2864 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2865 png_uint_32 mmx_rowbytes_threshold)); 2866 2867 #endif /* PNG_1_0_X */ 2868 2869 #if !defined(PNG_1_0_X) 2870 /* png.c, pnggccrd.c, or pngvcrd.c */ 2871 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2872 #endif /* PNG_1_0_X */ 2873 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2874 2875 /* Strip the prepended error numbers ("#nnn ") from error and warning 2876 * messages before passing them to the error or warning handler. 2877 */ 2878 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2879 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2880 png_ptr, png_uint_32 strip_mode)); 2881 #endif 2882 2883 /* Added at libpng-1.2.6 */ 2884 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2885 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2886 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2887 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2888 png_ptr)); 2889 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2890 png_ptr)); 2891 #endif 2892 2893 2894 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2895 * project defs 2896 */ 2897 2898 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2899 /* With these routines we avoid an integer divide, which will be slower on 2900 * most machines. However, it does take more operations than the corresponding 2901 * divide method, so it may be slower on a few RISC systems. There are two 2902 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2903 * 2904 * Note that the rounding factors are NOT supposed to be the same! 128 and 2905 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2906 * standard method. 2907 * 2908 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2909 */ 2910 2911 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2912 2913 # define png_composite(composite, fg, alpha, bg) \ 2914 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2915 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2916 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2917 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2918 2919 # define png_composite_16(composite, fg, alpha, bg) \ 2920 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2921 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2922 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2923 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2924 2925 #else /* Standard method using integer division */ 2926 2927 # define png_composite(composite, fg, alpha, bg) \ 2928 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2929 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2930 (png_uint_16)127) / 255) 2931 2932 # define png_composite_16(composite, fg, alpha, bg) \ 2933 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2934 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2935 (png_uint_32)32767) / (png_uint_32)65535L) 2936 2937 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2938 2939 /* Inline macros to do direct reads of bytes from the input buffer. These 2940 * require that you are using an architecture that uses PNG byte ordering 2941 * (MSB first) and supports unaligned data storage. I think that PowerPC 2942 * in big-endian mode and 680x0 are the only ones that will support this. 2943 * The x86 line of processors definitely do not. The png_get_int_32() 2944 * routine also assumes we are using two's complement format for negative 2945 * values, which is almost certainly true. 2946 */ 2947 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2948 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2949 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2950 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2951 #else 2952 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2953 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2954 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2955 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2956 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2957 PNGARG((png_structp png_ptr, png_bytep buf)); 2958 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2959 2960 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2961 */ 2962 extern PNG_EXPORT(void,png_save_uint_32) 2963 PNGARG((png_bytep buf, png_uint_32 i)); 2964 extern PNG_EXPORT(void,png_save_int_32) 2965 PNGARG((png_bytep buf, png_int_32 i)); 2966 2967 /* Place a 16-bit number into a buffer in PNG byte order. 2968 * The parameter is declared unsigned int, not png_uint_16, 2969 * just to avoid potential problems on pre-ANSI C compilers. 2970 */ 2971 extern PNG_EXPORT(void,png_save_uint_16) 2972 PNGARG((png_bytep buf, MS_U32 i)); 2973 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2974 2975 /* ************************************************************************* */ 2976 2977 /* These next functions are used internally in the code. They generally 2978 * shouldn't be used unless you are writing code to add or replace some 2979 * functionality in libpng. More information about most functions can 2980 * be found in the files where the functions are located. 2981 */ 2982 2983 2984 /* Various modes of operation, that are visible to applications because 2985 * they are used for unknown chunk location. 2986 */ 2987 #define PNG_HAVE_IHDR 0x01 2988 #define PNG_HAVE_PLTE 0x02 2989 #define PNG_HAVE_IDAT 0x04 2990 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2991 #define PNG_HAVE_IEND 0x10 2992 2993 #if defined(PNG_INTERNAL) 2994 2995 /* More modes of operation. Note that after an init, mode is set to 2996 * zero automatically when the structure is created. 2997 */ 2998 #define PNG_HAVE_gAMA 0x20 2999 #define PNG_HAVE_cHRM 0x40 3000 #define PNG_HAVE_sRGB 0x80 3001 #define PNG_HAVE_CHUNK_HEADER 0x100 3002 #define PNG_WROTE_tIME 0x200 3003 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 3004 #define PNG_BACKGROUND_IS_GRAY 0x800 3005 #define PNG_HAVE_PNG_SIGNATURE 0x1000 3006 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 3007 3008 /* Flags for the transformations the PNG library does on the image data */ 3009 #define PNG_BGR 0x0001 3010 #define PNG_INTERLACE 0x0002 3011 #define PNG_PACK 0x0004 3012 #define PNG_SHIFT 0x0008 3013 #define PNG_SWAP_BYTES 0x0010 3014 #define PNG_INVERT_MONO 0x0020 3015 #define PNG_DITHER 0x0040 3016 #define PNG_BACKGROUND 0x0080 3017 #define PNG_BACKGROUND_EXPAND 0x0100 3018 /* 0x0200 unused */ 3019 #define PNG_16_TO_8 0x0400 3020 #define PNG_RGBA 0x0800 3021 #define PNG_EXPAND 0x1000 3022 #define PNG_GAMMA 0x2000 3023 #define PNG_GRAY_TO_RGB 0x4000 3024 #define PNG_FILLER 0x8000L 3025 #define PNG_PACKSWAP 0x10000L 3026 #define PNG_SWAP_ALPHA 0x20000L 3027 #define PNG_STRIP_ALPHA 0x40000L 3028 #define PNG_INVERT_ALPHA 0x80000L 3029 #define PNG_USER_TRANSFORM 0x100000L 3030 #define PNG_RGB_TO_GRAY_ERR 0x200000L 3031 #define PNG_RGB_TO_GRAY_WARN 0x400000L 3032 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 3033 /* 0x800000L Unused */ 3034 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 3035 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 3036 /* 0x4000000L unused */ 3037 /* 0x8000000L unused */ 3038 /* 0x10000000L unused */ 3039 /* 0x20000000L unused */ 3040 /* 0x40000000L unused */ 3041 3042 /* Flags for png_create_struct */ 3043 #define PNG_STRUCT_PNG 0x0001 3044 #define PNG_STRUCT_INFO 0x0002 3045 3046 /* Scaling factor for filter heuristic weighting calculations */ 3047 #define PNG_WEIGHT_SHIFT 8 3048 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 3049 #define PNG_COST_SHIFT 3 3050 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 3051 3052 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 3053 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 3054 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 3055 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 3056 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 3057 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 3058 #define PNG_FLAG_ZLIB_FINISHED 0x0020 3059 #define PNG_FLAG_ROW_INIT 0x0040 3060 #define PNG_FLAG_FILLER_AFTER 0x0080 3061 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 3062 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 3063 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 3064 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 3065 #define PNG_FLAG_FREE_PLTE 0x1000 3066 #define PNG_FLAG_FREE_TRNS 0x2000 3067 #define PNG_FLAG_FREE_HIST 0x4000 3068 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 3069 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 3070 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 3071 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 3072 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 3073 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 3074 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 3075 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 3076 /* 0x800000L unused */ 3077 /* 0x1000000L unused */ 3078 /* 0x2000000L unused */ 3079 /* 0x4000000L unused */ 3080 /* 0x8000000L unused */ 3081 /* 0x10000000L unused */ 3082 /* 0x20000000L unused */ 3083 /* 0x40000000L unused */ 3084 3085 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3086 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3087 3088 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3089 PNG_FLAG_CRC_CRITICAL_IGNORE) 3090 3091 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3092 PNG_FLAG_CRC_CRITICAL_MASK) 3093 3094 /* Save typing and make code easier to understand */ 3095 3096 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3097 abs((int)((c1).green) - (int)((c2).green)) + \ 3098 abs((int)((c1).blue) - (int)((c2).blue))) 3099 3100 /* Added to libpng-1.2.6 JB */ 3101 #define PNG_ROWBYTES(pixel_bits, width) \ 3102 ((pixel_bits) >= 8 ? \ 3103 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3104 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3105 3106 /* PNG_OUT_OF_RANGE returns true if value is outside the range 3107 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3108 * "ideal" and "delta" should be constants, normally simple 3109 * integers, "value" a variable. Added to libpng-1.2.6 JB 3110 */ 3111 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3112 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3113 3114 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3115 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3116 /* Place to hold the signature string for a PNG file. */ 3117 #ifdef PNG_USE_GLOBAL_ARRAYS 3118 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3119 #else 3120 #endif 3121 #endif /* PNG_NO_EXTERN */ 3122 3123 /* Constant strings for known chunk types. If you need to add a chunk, 3124 * define the name here, and add an invocation of the macro in png.c and 3125 * wherever it's needed. 3126 */ 3127 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3128 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3129 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3130 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3131 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3132 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3133 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3134 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3135 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3136 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3137 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3138 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3139 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3140 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3141 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3142 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3143 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3144 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3145 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3146 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3147 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3148 3149 #ifdef PNG_USE_GLOBAL_ARRAYS 3150 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3151 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3152 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3153 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3154 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3155 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3156 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3157 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3158 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3159 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3160 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3161 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3162 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3163 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3164 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3165 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3166 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3167 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3168 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3169 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3170 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3171 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3172 3173 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3174 /* Initialize png_ptr struct for reading, and allocate any other memory. 3175 * (old interface - DEPRECATED - use png_create_read_struct instead). 3176 */ 3177 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 3178 #undef png_read_init 3179 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3180 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3181 #endif 3182 3183 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3184 png_const_charp user_png_ver, png_size_t png_struct_size)); 3185 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3186 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3187 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3188 png_info_size)); 3189 #endif 3190 3191 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3192 /* Initialize png_ptr struct for writing, and allocate any other memory. 3193 * (old interface - DEPRECATED - use png_create_write_struct instead). 3194 */ 3195 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 3196 #undef png_write_init 3197 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3198 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3199 #endif 3200 3201 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3202 png_const_charp user_png_ver, png_size_t png_struct_size)); 3203 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3204 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3205 png_info_size)); 3206 3207 /* Allocate memory for an internal libpng struct */ 3208 PNG_EXTERN png_voidp png_create_struct PNGARG((MS_U32 type)); 3209 3210 /* Free memory from internal libpng struct */ 3211 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 3212 3213 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((MS_U32 type, png_malloc_ptr 3214 malloc_fn, png_voidp mem_ptr)); 3215 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3216 png_free_ptr free_fn, png_voidp mem_ptr)); 3217 3218 /* Free any memory that info_ptr points to and reset struct. */ 3219 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3220 png_infop info_ptr)); 3221 3222 #ifndef PNG_1_0_X 3223 /* Function to allocate memory for zlib. */ 3224 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 3225 3226 /* Function to free memory for zlib */ 3227 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 3228 3229 #ifdef PNG_SIZE_T 3230 /* Function to convert a sizeof an item to png_sizeof item */ 3231 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 3232 #endif 3233 3234 /* Next four functions are used internally as callbacks. PNGAPI is required 3235 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3236 */ 3237 3238 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3239 png_bytep data, png_size_t length)); 3240 3241 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3242 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3243 png_bytep buffer, png_size_t length)); 3244 #endif 3245 3246 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3247 png_bytep data, png_size_t length)); 3248 3249 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3250 #if !defined(PNG_NO_STDIO) 3251 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 3252 #endif 3253 #endif 3254 #else /* PNG_1_0_X */ 3255 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3256 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3257 png_bytep buffer, png_size_t length)); 3258 #endif 3259 #endif /* PNG_1_0_X */ 3260 3261 /* Reset the CRC variable */ 3262 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 3263 3264 /* Write the "data" buffer to whatever output you are using. */ 3265 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3266 png_size_t length)); 3267 3268 /* Read data from whatever input you are using into the "data" buffer */ 3269 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3270 png_size_t length)); 3271 3272 /* Read bytes into buf, and update png_ptr->crc */ 3273 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3274 png_size_t length)); 3275 3276 /* Decompress data in a chunk that uses compression */ 3277 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3278 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3279 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3280 MS_U32 comp_type, png_size_t chunklength, 3281 png_size_t prefix_length, png_size_t *data_length)); 3282 #endif 3283 3284 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3285 PNG_EXTERN MS_U32 png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 3286 3287 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3288 PNG_EXTERN MS_U32 png_crc_error PNGARG((png_structp png_ptr)); 3289 3290 /* Calculate the CRC over a section of data. Note that we are only 3291 * passing a maximum of 64K on systems that have this as a memory limit, 3292 * since this is the maximum buffer size we can specify. 3293 */ 3294 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3295 png_size_t length)); 3296 3297 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3298 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 3299 #endif 3300 3301 /* Simple function to write the signature */ 3302 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 3303 3304 /* Write various chunks */ 3305 3306 /* Write the IHDR chunk, and update the png_struct with the necessary 3307 * information. 3308 */ 3309 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3310 png_uint_32 height, 3311 MS_U32 bit_depth, MS_U32 color_type, MS_U32 compression_method, MS_U32 filter_method, 3312 MS_U32 interlace_method)); 3313 3314 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3315 png_uint_32 num_pal)); 3316 3317 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3318 png_size_t length)); 3319 3320 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 3321 3322 #if defined(PNG_WRITE_gAMA_SUPPORTED) 3323 #ifdef PNG_FLOATING_POINT_SUPPORTED 3324 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 3325 #endif 3326 #ifdef PNG_FIXED_POINT_SUPPORTED 3327 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 3328 file_gamma)); 3329 #endif 3330 #endif 3331 3332 #if defined(PNG_WRITE_sBIT_SUPPORTED) 3333 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3334 MS_U32 color_type)); 3335 #endif 3336 3337 #if defined(PNG_WRITE_cHRM_SUPPORTED) 3338 #ifdef PNG_FLOATING_POINT_SUPPORTED 3339 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3340 double white_x, double white_y, 3341 double red_x, double red_y, double green_x, double green_y, 3342 double blue_x, double blue_y)); 3343 #endif 3344 #ifdef PNG_FIXED_POINT_SUPPORTED 3345 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3346 png_fixed_point int_white_x, png_fixed_point int_white_y, 3347 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3348 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3349 png_fixed_point int_blue_y)); 3350 #endif 3351 #endif 3352 3353 #if defined(PNG_WRITE_sRGB_SUPPORTED) 3354 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3355 MS_U32 intent)); 3356 #endif 3357 3358 #if defined(PNG_WRITE_iCCP_SUPPORTED) 3359 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3360 png_charp name, MS_U32 compression_type, 3361 png_charp profile, MS_U32 proflen)); 3362 /* Note to maintainer: profile should be png_bytep */ 3363 #endif 3364 3365 #if defined(PNG_WRITE_sPLT_SUPPORTED) 3366 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3367 png_sPLT_tp palette)); 3368 #endif 3369 3370 #if defined(PNG_WRITE_tRNS_SUPPORTED) 3371 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3372 png_color_16p values, MS_U32 number, MS_U32 color_type)); 3373 #endif 3374 3375 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3376 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3377 png_color_16p values, MS_U32 color_type)); 3378 #endif 3379 3380 #if defined(PNG_WRITE_hIST_SUPPORTED) 3381 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3382 MS_U32 num_hist)); 3383 #endif 3384 3385 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3386 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3387 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3388 png_charp key, png_charpp new_key)); 3389 #endif 3390 3391 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3392 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3393 png_charp text, png_size_t text_len)); 3394 #endif 3395 3396 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3397 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3398 png_charp text, png_size_t text_len, MS_U32 compression)); 3399 #endif 3400 3401 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3402 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3403 MS_U32 compression, png_charp key, png_charp lang, png_charp lang_key, 3404 png_charp text)); 3405 #endif 3406 3407 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3408 PNG_EXTERN MS_U32 png_set_text_2 PNGARG((png_structp png_ptr, 3409 png_infop info_ptr, png_textp text_ptr, MS_U32 num_text)); 3410 #endif 3411 3412 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3413 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3414 png_int_32 x_offset, png_int_32 y_offset, MS_U32 unit_type)); 3415 #endif 3416 3417 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3418 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3419 png_int_32 X0, png_int_32 X1, MS_U32 type, MS_U32 nparams, 3420 png_charp units, png_charpp params)); 3421 #endif 3422 3423 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3424 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3425 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3426 MS_U32 unit_type)); 3427 #endif 3428 3429 #if defined(PNG_WRITE_tIME_SUPPORTED) 3430 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3431 png_timep mod_time)); 3432 #endif 3433 3434 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3435 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3436 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3437 MS_U32 unit, double width, double height)); 3438 #else 3439 #ifdef PNG_FIXED_POINT_SUPPORTED 3440 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3441 MS_U32 unit, png_charp width, png_charp height)); 3442 #endif 3443 #endif 3444 #endif 3445 3446 /* Called when finished processing a row of data */ 3447 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3448 3449 /* Internal use only. Called before first row of data */ 3450 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3451 3452 #if defined(PNG_READ_GAMMA_SUPPORTED) 3453 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3454 #endif 3455 3456 /* Combine a row of data, dealing with alpha, etc. if requested */ 3457 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3458 MS_U32 mask)); 3459 3460 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3461 /* Expand an interlaced row */ 3462 /* OLD pre-1.0.9 interface: 3463 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3464 png_bytep row, MS_U32 pass, png_uint_32 transformations)); 3465 */ 3466 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3467 #endif 3468 3469 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3470 3471 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3472 /* Grab pixels out of a row for an interlaced pass */ 3473 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3474 png_bytep row, MS_U32 pass)); 3475 #endif 3476 3477 /* Unfilter a row */ 3478 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3479 png_row_infop row_info, png_bytep row, png_bytep prev_row, MS_U32 filter)); 3480 3481 /* Choose the best filter to use and filter the row data */ 3482 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3483 png_row_infop row_info)); 3484 3485 /* Write out the filtered row. */ 3486 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3487 png_bytep filtered_row)); 3488 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3489 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3490 3491 /* Initialize the row buffers, etc. */ 3492 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3493 /* Optional call to update the users info structure */ 3494 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3495 png_infop info_ptr)); 3496 3497 /* These are the functions that do the transformations */ 3498 #if defined(PNG_READ_FILLER_SUPPORTED) 3499 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3500 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3501 #endif 3502 3503 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3504 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3505 png_bytep row)); 3506 #endif 3507 3508 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3509 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3510 png_bytep row)); 3511 #endif 3512 3513 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3514 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3515 png_bytep row)); 3516 #endif 3517 3518 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3519 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3520 png_bytep row)); 3521 #endif 3522 3523 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3524 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3525 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3526 png_bytep row, png_uint_32 flags)); 3527 #endif 3528 3529 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3530 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3531 #endif 3532 3533 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3534 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3535 #endif 3536 3537 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3538 PNG_EXTERN MS_U32 png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3539 row_info, png_bytep row)); 3540 #endif 3541 3542 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3543 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3544 png_bytep row)); 3545 #endif 3546 3547 #if defined(PNG_READ_PACK_SUPPORTED) 3548 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3549 #endif 3550 3551 #if defined(PNG_READ_SHIFT_SUPPORTED) 3552 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3553 png_color_8p sig_bits)); 3554 #endif 3555 3556 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3557 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3558 #endif 3559 3560 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3561 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3562 #endif 3563 3564 #if defined(PNG_READ_DITHER_SUPPORTED) 3565 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3566 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3567 3568 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3569 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3570 png_colorp palette, MS_U32 num_palette)); 3571 # endif 3572 #endif 3573 3574 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3575 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3576 #endif 3577 3578 #if defined(PNG_WRITE_PACK_SUPPORTED) 3579 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3580 png_bytep row, png_uint_32 bit_depth)); 3581 #endif 3582 3583 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3584 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3585 png_color_8p bit_depth)); 3586 #endif 3587 3588 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3589 #if defined(PNG_READ_GAMMA_SUPPORTED) 3590 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3591 png_color_16p trans_values, png_color_16p background, 3592 png_color_16p background_1, 3593 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3594 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3595 png_uint_16pp gamma_16_to_1, MS_U32 gamma_shift)); 3596 #else 3597 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3598 png_color_16p trans_values, png_color_16p background)); 3599 #endif 3600 #endif 3601 3602 #if defined(PNG_READ_GAMMA_SUPPORTED) 3603 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3604 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3605 MS_U32 gamma_shift)); 3606 #endif 3607 3608 #if defined(PNG_READ_EXPAND_SUPPORTED) 3609 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3610 png_bytep row, png_colorp palette, png_bytep trans, MS_U32 num_trans)); 3611 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3612 png_bytep row, png_color_16p trans_value)); 3613 #endif 3614 3615 /* The following decodes the appropriate chunks, and does error correction, 3616 * then calls the appropriate callback for the chunk if it is valid. 3617 */ 3618 3619 /* Decode the IHDR chunk */ 3620 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3621 png_uint_32 length)); 3622 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3623 png_uint_32 length)); 3624 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3625 png_uint_32 length)); 3626 3627 #if defined(PNG_READ_bKGD_SUPPORTED) 3628 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3629 png_uint_32 length)); 3630 #endif 3631 3632 #if defined(PNG_READ_cHRM_SUPPORTED) 3633 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3634 png_uint_32 length)); 3635 #endif 3636 3637 #if defined(PNG_READ_gAMA_SUPPORTED) 3638 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3639 png_uint_32 length)); 3640 #endif 3641 3642 #if defined(PNG_READ_hIST_SUPPORTED) 3643 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3644 png_uint_32 length)); 3645 #endif 3646 3647 #if defined(PNG_READ_iCCP_SUPPORTED) 3648 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3649 png_uint_32 length)); 3650 #endif /* PNG_READ_iCCP_SUPPORTED */ 3651 3652 #if defined(PNG_READ_iTXt_SUPPORTED) 3653 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3654 png_uint_32 length)); 3655 #endif 3656 3657 #if defined(PNG_READ_oFFs_SUPPORTED) 3658 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3659 png_uint_32 length)); 3660 #endif 3661 3662 #if defined(PNG_READ_pCAL_SUPPORTED) 3663 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3664 png_uint_32 length)); 3665 #endif 3666 3667 #if defined(PNG_READ_pHYs_SUPPORTED) 3668 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3669 png_uint_32 length)); 3670 #endif 3671 3672 #if defined(PNG_READ_sBIT_SUPPORTED) 3673 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3674 png_uint_32 length)); 3675 #endif 3676 3677 #if defined(PNG_READ_sCAL_SUPPORTED) 3678 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3679 png_uint_32 length)); 3680 #endif 3681 3682 #if defined(PNG_READ_sPLT_SUPPORTED) 3683 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3684 png_uint_32 length)); 3685 #endif /* PNG_READ_sPLT_SUPPORTED */ 3686 3687 #if defined(PNG_READ_sRGB_SUPPORTED) 3688 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3689 png_uint_32 length)); 3690 #endif 3691 3692 #if defined(PNG_READ_tEXt_SUPPORTED) 3693 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3694 png_uint_32 length)); 3695 #endif 3696 3697 #if defined(PNG_READ_tIME_SUPPORTED) 3698 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3699 png_uint_32 length)); 3700 #endif 3701 3702 #if defined(PNG_READ_tRNS_SUPPORTED) 3703 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3704 png_uint_32 length)); 3705 #endif 3706 3707 #if defined(PNG_READ_zTXt_SUPPORTED) 3708 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3709 png_uint_32 length)); 3710 #endif 3711 3712 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3713 png_infop info_ptr, png_uint_32 length)); 3714 3715 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3716 png_bytep chunk_name)); 3717 3718 /* Handle the transformations for reading and writing */ 3719 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3720 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3721 3722 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3723 3724 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3725 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3726 png_infop info_ptr)); 3727 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3728 png_infop info_ptr)); 3729 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3730 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3731 png_uint_32 length)); 3732 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3733 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3734 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3735 png_bytep buffer, png_size_t buffer_length)); 3736 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3737 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3738 png_bytep buffer, png_size_t buffer_length)); 3739 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3740 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3741 png_infop info_ptr, png_uint_32 length)); 3742 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3743 png_infop info_ptr)); 3744 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3745 png_infop info_ptr)); 3746 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3747 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3748 png_infop info_ptr)); 3749 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3750 png_infop info_ptr)); 3751 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3752 #if defined(PNG_READ_tEXt_SUPPORTED) 3753 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3754 png_infop info_ptr, png_uint_32 length)); 3755 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3756 png_infop info_ptr)); 3757 #endif 3758 #if defined(PNG_READ_zTXt_SUPPORTED) 3759 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3760 png_infop info_ptr, png_uint_32 length)); 3761 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3762 png_infop info_ptr)); 3763 #endif 3764 #if defined(PNG_READ_iTXt_SUPPORTED) 3765 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3766 png_infop info_ptr, png_uint_32 length)); 3767 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3768 png_infop info_ptr)); 3769 #endif 3770 3771 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3772 3773 #ifdef PNG_MNG_FEATURES_SUPPORTED 3774 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3775 png_bytep row)); 3776 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3777 png_bytep row)); 3778 #endif 3779 3780 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3781 #if defined(PNG_MMX_CODE_SUPPORTED) 3782 /* png.c */ /* PRIVATE */ 3783 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3784 #endif 3785 #endif 3786 3787 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3788 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3789 png_infop info_ptr)); 3790 3791 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3792 png_infop info_ptr)); 3793 3794 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3795 png_infop info_ptr)); 3796 3797 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3798 png_infop info_ptr)); 3799 3800 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3801 png_infop info_ptr)); 3802 3803 #if defined(PNG_pHYs_SUPPORTED) 3804 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3805 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, MS_U32 *unit_type)); 3806 #endif /* PNG_pHYs_SUPPORTED */ 3807 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3808 3809 /* Read the chunk header (length + type name) */ 3810 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); 3811 3812 /* Added at libpng version 1.2.34 */ 3813 #if defined(PNG_cHRM_SUPPORTED) 3814 PNG_EXTERN MS_U32 png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3815 png_fixed_point int_white_x, png_fixed_point int_white_y, 3816 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3817 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3818 png_fixed_point int_blue_y)); 3819 #endif 3820 3821 #if defined(PNG_cHRM_SUPPORTED) 3822 #if !defined(PNG_NO_CHECK_cHRM) 3823 /* Added at libpng version 1.2.34 */ 3824 PNG_EXTERN void png_64bit_product (long v1, long v2, MS_U32 *hi_product, 3825 MS_U32 *lo_product); 3826 #endif 3827 #endif 3828 3829 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3830 3831 #endif /* PNG_INTERNAL */ 3832 3833 #ifdef __cplusplus 3834 } 3835 #endif 3836 3837 #endif /* PNG_VERSION_INFO_ONLY */ 3838 /* Do not put anything past this line */ 3839 #endif /* PNG_H */ 3840