1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.38 - July 16, 2009 4 * Copyright (c) 1998-2009 Glenn Randers-Pehrson 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 7 * 8 * This code is released under the libpng license (See LICENSE, below) 9 * 10 * Authors and maintainers: 11 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 12 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 13 * libpng versions 0.97, January 1998, through 1.2.38 - July 16, 2009: Glenn 14 * See also "Contributing Authors", below. 15 * 16 * Note about libpng version numbers: 17 * 18 * Due to various miscommunications, unforeseen code incompatibilities 19 * and occasional factors outside the authors' control, version numbering 20 * on the library has not always been consistent and straightforward. 21 * The following table summarizes matters since version 0.89c, which was 22 * the first widely used release: 23 * 24 * source png.h png.h shared-lib 25 * version string int version 26 * ------- ------ ----- ---------- 27 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 28 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 29 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 30 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 31 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 32 * 0.97c 0.97 97 2.0.97 33 * 0.98 0.98 98 2.0.98 34 * 0.99 0.99 98 2.0.99 35 * 0.99a-m 0.99 99 2.0.99 36 * 1.00 1.00 100 2.1.0 [100 should be 10000] 37 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 38 * 1.0.1 png.h string is 10001 2.1.0 39 * 1.0.1a-e identical to the 10002 from here on, the shared library 40 * 1.0.2 source version) 10002 is 2.V where V is the source code 41 * 1.0.2a-b 10003 version, except as noted. 42 * 1.0.3 10003 43 * 1.0.3a-d 10004 44 * 1.0.4 10004 45 * 1.0.4a-f 10005 46 * 1.0.5 (+ 2 patches) 10005 47 * 1.0.5a-d 10006 48 * 1.0.5e-r 10100 (not source compatible) 49 * 1.0.5s-v 10006 (not binary compatible) 50 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 51 * 1.0.6d-f 10007 (still binary incompatible) 52 * 1.0.6g 10007 53 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 54 * 1.0.6i 10007 10.6i 55 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 56 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 57 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 58 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 59 * 1.0.7 1 10007 (still compatible) 60 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 61 * 1.0.8rc1 1 10008 2.1.0.8rc1 62 * 1.0.8 1 10008 2.1.0.8 63 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 64 * 1.0.9rc1 1 10009 2.1.0.9rc1 65 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 66 * 1.0.9rc2 1 10009 2.1.0.9rc2 67 * 1.0.9 1 10009 2.1.0.9 68 * 1.0.10beta1 1 10010 2.1.0.10beta1 69 * 1.0.10rc1 1 10010 2.1.0.10rc1 70 * 1.0.10 1 10010 2.1.0.10 71 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 72 * 1.0.11rc1 1 10011 2.1.0.11rc1 73 * 1.0.11 1 10011 2.1.0.11 74 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 75 * 1.0.12rc1 2 10012 2.1.0.12rc1 76 * 1.0.12 2 10012 2.1.0.12 77 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 78 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 79 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 80 * 1.2.0rc1 3 10200 3.1.2.0rc1 81 * 1.2.0 3 10200 3.1.2.0 82 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 83 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 84 * 1.2.1 3 10201 3.1.2.1 85 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 86 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 87 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 88 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 89 * 1.0.13 10 10013 10.so.0.1.0.13 90 * 1.2.2 12 10202 12.so.0.1.2.2 91 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 92 * 1.2.3 12 10203 12.so.0.1.2.3 93 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 94 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 95 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 96 * 1.0.14 10 10014 10.so.0.1.0.14 97 * 1.2.4 13 10204 12.so.0.1.2.4 98 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 99 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 100 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 101 * 1.0.15 10 10015 10.so.0.1.0.15 102 * 1.2.5 13 10205 12.so.0.1.2.5 103 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 104 * 1.0.16 10 10016 10.so.0.1.0.16 105 * 1.2.6 13 10206 12.so.0.1.2.6 106 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 107 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 108 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 109 * 1.0.17 10 10017 10.so.0.1.0.17 110 * 1.2.7 13 10207 12.so.0.1.2.7 111 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 112 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 113 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 114 * 1.0.18 10 10018 10.so.0.1.0.18 115 * 1.2.8 13 10208 12.so.0.1.2.8 116 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 117 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 118 * 1.2.9rc1 13 10209 12.so.0.9[.0] 119 * 1.2.9 13 10209 12.so.0.9[.0] 120 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] 121 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] 122 * 1.2.10 13 10210 12.so.0.10[.0] 123 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 124 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] 125 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] 126 * 1.0.19 10 10019 10.so.0.19[.0] 127 * 1.2.11 13 10211 12.so.0.11[.0] 128 * 1.0.20 10 10020 10.so.0.20[.0] 129 * 1.2.12 13 10212 12.so.0.12[.0] 130 * 1.2.13beta1 13 10213 12.so.0.13[.0] 131 * 1.0.21 10 10021 10.so.0.21[.0] 132 * 1.2.13 13 10213 12.so.0.13[.0] 133 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] 134 * 1.0.22rc1 10 10022 10.so.0.22[.0] 135 * 1.2.14rc1 13 10214 12.so.0.14[.0] 136 * 1.0.22 10 10022 10.so.0.22[.0] 137 * 1.2.14 13 10214 12.so.0.14[.0] 138 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] 139 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] 140 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] 141 * 1.0.23 10 10023 10.so.0.23[.0] 142 * 1.2.15 13 10215 12.so.0.15[.0] 143 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] 144 * 1.2.16rc1 13 10216 12.so.0.16[.0] 145 * 1.0.24 10 10024 10.so.0.24[.0] 146 * 1.2.16 13 10216 12.so.0.16[.0] 147 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] 148 * 1.0.25rc1 10 10025 10.so.0.25[.0] 149 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] 150 * 1.0.25 10 10025 10.so.0.25[.0] 151 * 1.2.17 13 10217 12.so.0.17[.0] 152 * 1.0.26 10 10026 10.so.0.26[.0] 153 * 1.2.18 13 10218 12.so.0.18[.0] 154 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] 155 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] 156 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] 157 * 1.0.27 10 10027 10.so.0.27[.0] 158 * 1.2.19 13 10219 12.so.0.19[.0] 159 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] 160 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] 161 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] 162 * 1.0.28 10 10028 10.so.0.28[.0] 163 * 1.2.20 13 10220 12.so.0.20[.0] 164 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] 165 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] 166 * 1.0.29 10 10029 10.so.0.29[.0] 167 * 1.2.21 13 10221 12.so.0.21[.0] 168 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] 169 * 1.0.30rc1 10 10030 10.so.0.30[.0] 170 * 1.2.22rc1 13 10222 12.so.0.22[.0] 171 * 1.0.30 10 10030 10.so.0.30[.0] 172 * 1.2.22 13 10222 12.so.0.22[.0] 173 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] 174 * 1.2.23rc01 13 10223 12.so.0.23[.0] 175 * 1.2.23 13 10223 12.so.0.23[.0] 176 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] 177 * 1.2.24rc01 13 10224 12.so.0.24[.0] 178 * 1.2.24 13 10224 12.so.0.24[.0] 179 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] 180 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] 181 * 1.0.31 10 10031 10.so.0.31[.0] 182 * 1.2.25 13 10225 12.so.0.25[.0] 183 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] 184 * 1.2.26rc01 13 10226 12.so.0.26[.0] 185 * 1.2.26 13 10226 12.so.0.26[.0] 186 * 1.0.32 10 10032 10.so.0.32[.0] 187 * 1.2.27beta01-06 13 10227 12.so.0.27[.0] 188 * 1.2.27rc01 13 10227 12.so.0.27[.0] 189 * 1.0.33 10 10033 10.so.0.33[.0] 190 * 1.2.27 13 10227 12.so.0.27[.0] 191 * 1.0.34 10 10034 10.so.0.34[.0] 192 * 1.2.28 13 10228 12.so.0.28[.0] 193 * 1.2.29beta01-03 13 10229 12.so.0.29[.0] 194 * 1.2.29rc01 13 10229 12.so.0.29[.0] 195 * 1.0.35 10 10035 10.so.0.35[.0] 196 * 1.2.29 13 10229 12.so.0.29[.0] 197 * 1.0.37 10 10037 10.so.0.37[.0] 198 * 1.2.30beta01-04 13 10230 12.so.0.30[.0] 199 * 1.0.38rc01-08 10 10038 10.so.0.38[.0] 200 * 1.2.30rc01-08 13 10230 12.so.0.30[.0] 201 * 1.0.38 10 10038 10.so.0.38[.0] 202 * 1.2.30 13 10230 12.so.0.30[.0] 203 * 1.0.39rc01-03 10 10039 10.so.0.39[.0] 204 * 1.2.31rc01-03 13 10231 12.so.0.31[.0] 205 * 1.0.39 10 10039 10.so.0.39[.0] 206 * 1.2.31 13 10231 12.so.0.31[.0] 207 * 1.2.32beta01-02 13 10232 12.so.0.32[.0] 208 * 1.0.40rc01 10 10040 10.so.0.40[.0] 209 * 1.2.32rc01 13 10232 12.so.0.32[.0] 210 * 1.0.40 10 10040 10.so.0.40[.0] 211 * 1.2.32 13 10232 12.so.0.32[.0] 212 * 1.2.33beta01-02 13 10233 12.so.0.33[.0] 213 * 1.2.33rc01-02 13 10233 12.so.0.33[.0] 214 * 1.0.41rc01 10 10041 10.so.0.41[.0] 215 * 1.2.33 13 10233 12.so.0.33[.0] 216 * 1.0.41 10 10041 10.so.0.41[.0] 217 * 1.2.34beta01-07 13 10234 12.so.0.34[.0] 218 * 1.0.42rc01 10 10042 10.so.0.42[.0] 219 * 1.2.34rc01 13 10234 12.so.0.34[.0] 220 * 1.0.42 10 10042 10.so.0.42[.0] 221 * 1.2.34 13 10234 12.so.0.34[.0] 222 * 1.2.35beta01-03 13 10235 12.so.0.35[.0] 223 * 1.0.43rc01-02 10 10043 10.so.0.43[.0] 224 * 1.2.35rc01-02 13 10235 12.so.0.35[.0] 225 * 1.0.43 10 10043 10.so.0.43[.0] 226 * 1.2.35 13 10235 12.so.0.35[.0] 227 * 1.2.36beta01-05 13 10236 12.so.0.36[.0] 228 * 1.2.36rc01 13 10236 12.so.0.36[.0] 229 * 1.0.44 10 10044 10.so.0.44[.0] 230 * 1.2.36 13 10236 12.so.0.36[.0] 231 * 1.2.37beta01-03 13 10237 12.so.0.37[.0] 232 * 1.2.37rc01 13 10237 12.so.0.37[.0] 233 * 1.2.37 13 10237 12.so.0.37[.0] 234 * 1.2.45 10 10045 12.so.0.45[.0] 235 * 1.0.46 10 10046 10.so.0.46[.0] 236 * 1.2.38beta01 13 10238 12.so.0.38[.0] 237 * 1.2.38rc01-03 13 10238 12.so.0.38[.0] 238 * 1.0.47 10 10047 10.so.0.47[.0] 239 * 1.2.38 13 10238 12.so.0.38[.0] 240 * 241 * Henceforth the source version will match the shared-library major 242 * and minor numbers; the shared-library major version number will be 243 * used for changes in backward compatibility, as it is intended. The 244 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 245 * for applications, is an unsigned integer of the form xyyzz corresponding 246 * to the source version x.y.z (leading zeros in y and z). Beta versions 247 * were given the previous public release number plus a letter, until 248 * version 1.0.6j; from then on they were given the upcoming public 249 * release number plus "betaNN" or "rcNN". 250 * 251 * Binary incompatibility exists only when applications make direct access 252 * to the info_ptr or png_ptr members through png.h, and the compiled 253 * application is loaded with a different version of the library. 254 * 255 * DLLNUM will change each time there are forward or backward changes 256 * in binary compatibility (e.g., when a new feature is added). 257 * 258 * See libpng.txt or libpng.3 for more information. The PNG specification 259 * is available as a W3C Recommendation and as an ISO Specification, 260 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 261 */ 262 263 /* 264 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 265 * 266 * If you modify libpng you may insert additional notices immediately following 267 * this sentence. 268 * 269 * This code is released under the libpng license. 270 * 271 * libpng versions 1.2.6, August 15, 2004, through 1.2.38, July 16, 2009, are 272 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are 273 * distributed according to the same disclaimer and license as libpng-1.2.5 274 * with the following individual added to the list of Contributing Authors: 275 * 276 * Cosmin Truta 277 * 278 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 279 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 280 * distributed according to the same disclaimer and license as libpng-1.0.6 281 * with the following individuals added to the list of Contributing Authors: 282 * 283 * Simon-Pierre Cadieux 284 * Eric S. Raymond 285 * Gilles Vollant 286 * 287 * and with the following additions to the disclaimer: 288 * 289 * There is no warranty against interference with your enjoyment of the 290 * library or against infringement. There is no warranty that our 291 * efforts or the library will fulfill any of your particular purposes 292 * or needs. This library is provided with all faults, and the entire 293 * risk of satisfactory quality, performance, accuracy, and effort is with 294 * the user. 295 * 296 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 297 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 298 * distributed according to the same disclaimer and license as libpng-0.96, 299 * with the following individuals added to the list of Contributing Authors: 300 * 301 * Tom Lane 302 * Glenn Randers-Pehrson 303 * Willem van Schaik 304 * 305 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 306 * Copyright (c) 1996, 1997 Andreas Dilger 307 * Distributed according to the same disclaimer and license as libpng-0.88, 308 * with the following individuals added to the list of Contributing Authors: 309 * 310 * John Bowler 311 * Kevin Bracey 312 * Sam Bushell 313 * Magnus Holmgren 314 * Greg Roelofs 315 * Tom Tanner 316 * 317 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 318 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 319 * 320 * For the purposes of this copyright and license, "Contributing Authors" 321 * is defined as the following set of individuals: 322 * 323 * Andreas Dilger 324 * Dave Martindale 325 * Guy Eric Schalnat 326 * Paul Schmidt 327 * Tim Wegner 328 * 329 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 330 * and Group 42, Inc. disclaim all warranties, expressed or implied, 331 * including, without limitation, the warranties of merchantability and of 332 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 333 * assume no liability for direct, indirect, incidental, special, exemplary, 334 * or consequential damages, which may result from the use of the PNG 335 * Reference Library, even if advised of the possibility of such damage. 336 * 337 * Permission is hereby granted to use, copy, modify, and distribute this 338 * source code, or portions hereof, for any purpose, without fee, subject 339 * to the following restrictions: 340 * 341 * 1. The origin of this source code must not be misrepresented. 342 * 343 * 2. Altered versions must be plainly marked as such and 344 * must not be misrepresented as being the original source. 345 * 346 * 3. This Copyright notice may not be removed or altered from 347 * any source or altered source distribution. 348 * 349 * The Contributing Authors and Group 42, Inc. specifically permit, without 350 * fee, and encourage the use of this source code as a component to 351 * supporting the PNG file format in commercial products. If you use this 352 * source code in a product, acknowledgment is not required but would be 353 * appreciated. 354 */ 355 356 /* 357 * A "png_get_copyright" function is available, for convenient use in "about" 358 * boxes and the like: 359 * 360 * printf("%s",png_get_copyright(NULL)); 361 * 362 * Also, the PNG logo (in PNG format, of course) is supplied in the 363 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 364 */ 365 366 /* 367 * Libpng is OSI Certified Open Source Software. OSI Certified is a 368 * certification mark of the Open Source Initiative. 369 */ 370 371 /* 372 * The contributing authors would like to thank all those who helped 373 * with testing, bug fixes, and patience. This wouldn't have been 374 * possible without all of you. 375 * 376 * Thanks to Frank J. T. Wojcik for helping with the documentation. 377 */ 378 379 /* 380 * Y2K compliance in libpng: 381 * ========================= 382 * 383 * July 16, 2009 384 * 385 * Since the PNG Development group is an ad-hoc body, we can't make 386 * an official declaration. 387 * 388 * This is your unofficial assurance that libpng from version 0.71 and 389 * upward through 1.2.38 are Y2K compliant. It is my belief that earlier 390 * versions were also Y2K compliant. 391 * 392 * Libpng only has three year fields. One is a 2-byte unsigned integer 393 * that will hold years up to 65535. The other two hold the date in text 394 * format, and will hold years up to 9999. 395 * 396 * The integer is 397 * "png_uint_16 year" in png_time_struct. 398 * 399 * The strings are 400 * "png_charp time_buffer" in png_struct and 401 * "near_time_buffer", which is a local character string in png.c. 402 * 403 * There are seven time-related functions: 404 * png.c: png_convert_to_rfc_1123() in png.c 405 * (formerly png_convert_to_rfc_1152() in error) 406 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 407 * png_convert_from_time_t() in pngwrite.c 408 * png_get_tIME() in pngget.c 409 * png_handle_tIME() in pngrutil.c, called in pngread.c 410 * png_set_tIME() in pngset.c 411 * png_write_tIME() in pngwutil.c, called in pngwrite.c 412 * 413 * All handle dates properly in a Y2K environment. The 414 * png_convert_from_time_t() function calls gmtime() to convert from system 415 * clock time, which returns (year - 1900), which we properly convert to 416 * the full 4-digit year. There is a possibility that applications using 417 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 418 * function, or that they are incorrectly passing only a 2-digit year 419 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 420 * but this is not under our control. The libpng documentation has always 421 * stated that it works with 4-digit years, and the APIs have been 422 * documented as such. 423 * 424 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 425 * integer to hold the year, and can hold years as large as 65535. 426 * 427 * zlib, upon which libpng depends, is also Y2K compliant. It contains 428 * no date-related code. 429 * 430 * Glenn Randers-Pehrson 431 * libpng maintainer 432 * PNG Development Group 433 */ 434 435 #ifndef PNG_H 436 #define PNG_H 437 438 /* This is not the place to learn how to use libpng. The file libpng.txt 439 * describes how to use libpng, and the file example.c summarizes it 440 * with some code on which to build. This file is useful for looking 441 * at the actual function definitions and structure components. 442 */ 443 444 /* Version information for png.h - this should match the version in png.c */ 445 #define PNG_LIBPNG_VER_STRING "1.2.38" 446 #define PNG_HEADER_VERSION_STRING \ 447 " libpng version 1.2.38 - July 16, 2009\n" 448 449 #define PNG_LIBPNG_VER_SONUM 0 450 #define PNG_LIBPNG_VER_DLLNUM 13 451 452 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 453 #define PNG_LIBPNG_VER_MAJOR 1 454 #define PNG_LIBPNG_VER_MINOR 2 455 #define PNG_LIBPNG_VER_RELEASE 38 456 /* This should match the numeric part of the final component of 457 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 458 */ 459 460 #define PNG_LIBPNG_VER_BUILD 0 461 462 /* Release Status */ 463 #define PNG_LIBPNG_BUILD_ALPHA 1 464 #define PNG_LIBPNG_BUILD_BETA 2 465 #define PNG_LIBPNG_BUILD_RC 3 466 #define PNG_LIBPNG_BUILD_STABLE 4 467 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 468 469 /* Release-Specific Flags */ 470 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 471 PNG_LIBPNG_BUILD_STABLE only */ 472 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 473 PNG_LIBPNG_BUILD_SPECIAL */ 474 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 475 PNG_LIBPNG_BUILD_PRIVATE */ 476 477 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 478 479 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 480 * We must not include leading zeros. 481 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 482 * version 1.0.0 was mis-numbered 100 instead of 10000). From 483 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 484 */ 485 #define PNG_LIBPNG_VER 10238 /* 1.2.38 */ 486 487 #ifndef PNG_VERSION_INFO_ONLY 488 /* include the compression library's header */ 489 #include "zlib.h" 490 #endif 491 492 /* include all user configurable info, including optional assembler routines */ 493 #include "pngconf.h" 494 495 /* 496 * Added at libpng-1.2.8 */ 497 /* Ref MSDN: Private as priority over Special 498 * VS_FF_PRIVATEBUILD File *was not* built using standard release 499 * procedures. If this value is given, the StringFileInfo block must 500 * contain a PrivateBuild string. 501 * 502 * VS_FF_SPECIALBUILD File *was* built by the original company using 503 * standard release procedures but is a variation of the standard 504 * file of the same version number. If this value is given, the 505 * StringFileInfo block must contain a SpecialBuild string. 506 */ 507 508 #if defined(PNG_USER_PRIVATEBUILD) 509 # define PNG_LIBPNG_BUILD_TYPE \ 510 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 511 #else 512 # if defined(PNG_LIBPNG_SPECIALBUILD) 513 # define PNG_LIBPNG_BUILD_TYPE \ 514 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 515 # else 516 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 517 # endif 518 #endif 519 520 #ifndef PNG_VERSION_INFO_ONLY 521 522 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 523 #ifdef __cplusplus 524 extern "C" { 525 #endif /* __cplusplus */ 526 527 /* This file is arranged in several sections. The first section contains 528 * structure and type definitions. The second section contains the external 529 * library functions, while the third has the internal library functions, 530 * which applications aren't expected to use directly. 531 */ 532 533 #ifndef PNG_NO_TYPECAST_NULL 534 #define int_p_NULL (int *)NULL 535 #define png_bytep_NULL (png_bytep)NULL 536 #define png_bytepp_NULL (png_bytepp)NULL 537 #define png_doublep_NULL (png_doublep)NULL 538 #define png_error_ptr_NULL (png_error_ptr)NULL 539 #define png_flush_ptr_NULL (png_flush_ptr)NULL 540 #define png_free_ptr_NULL (png_free_ptr)NULL 541 #define png_infopp_NULL (png_infopp)NULL 542 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 543 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 544 #define png_rw_ptr_NULL (png_rw_ptr)NULL 545 #define png_structp_NULL (png_structp)NULL 546 #define png_uint_16p_NULL (png_uint_16p)NULL 547 #define png_voidp_NULL (png_voidp)NULL 548 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 549 #else 550 #define int_p_NULL NULL 551 #define png_bytep_NULL NULL 552 #define png_bytepp_NULL NULL 553 #define png_doublep_NULL NULL 554 #define png_error_ptr_NULL NULL 555 #define png_flush_ptr_NULL NULL 556 #define png_free_ptr_NULL NULL 557 #define png_infopp_NULL NULL 558 #define png_malloc_ptr_NULL NULL 559 #define png_read_status_ptr_NULL NULL 560 #define png_rw_ptr_NULL NULL 561 #define png_structp_NULL NULL 562 #define png_uint_16p_NULL NULL 563 #define png_voidp_NULL NULL 564 #define png_write_status_ptr_NULL NULL 565 #endif 566 567 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 568 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 569 /* Version information for C files, stored in png.c. This had better match 570 * the version above. 571 */ 572 #ifdef PNG_USE_GLOBAL_ARRAYS 573 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 574 /* need room for 99.99.99beta99z */ 575 #else 576 #define png_libpng_ver png_get_header_ver(NULL) 577 #endif 578 579 #ifdef PNG_USE_GLOBAL_ARRAYS 580 /* This was removed in version 1.0.5c */ 581 /* Structures to facilitate easy interlacing. See png.c for more details */ 582 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 583 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 584 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 585 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 586 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 587 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 588 /* This isn't currently used. If you need it, see png.c for more details. 589 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 590 */ 591 #endif 592 593 #endif /* PNG_NO_EXTERN */ 594 595 /* Three color definitions. The order of the red, green, and blue, (and the 596 * exact size) is not important, although the size of the fields need to 597 * be png_byte or png_uint_16 (as defined below). 598 */ 599 typedef struct png_color_struct 600 { 601 png_byte red; 602 png_byte green; 603 png_byte blue; 604 } png_color; 605 typedef png_color FAR * png_colorp; 606 typedef png_color FAR * FAR * png_colorpp; 607 608 typedef struct png_color_16_struct 609 { 610 png_byte index; /* used for palette files */ 611 png_uint_16 red; /* for use in red green blue files */ 612 png_uint_16 green; 613 png_uint_16 blue; 614 png_uint_16 gray; /* for use in grayscale files */ 615 } png_color_16; 616 typedef png_color_16 FAR * png_color_16p; 617 typedef png_color_16 FAR * FAR * png_color_16pp; 618 619 typedef struct png_color_8_struct 620 { 621 png_byte red; /* for use in red green blue files */ 622 png_byte green; 623 png_byte blue; 624 png_byte gray; /* for use in grayscale files */ 625 png_byte alpha; /* for alpha channel files */ 626 } png_color_8; 627 typedef png_color_8 FAR * png_color_8p; 628 typedef png_color_8 FAR * FAR * png_color_8pp; 629 630 /* 631 * The following two structures are used for the in-core representation 632 * of sPLT chunks. 633 */ 634 typedef struct png_sPLT_entry_struct 635 { 636 png_uint_16 red; 637 png_uint_16 green; 638 png_uint_16 blue; 639 png_uint_16 alpha; 640 png_uint_16 frequency; 641 } png_sPLT_entry; 642 typedef png_sPLT_entry FAR * png_sPLT_entryp; 643 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 644 645 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 646 * occupy the LSB of their respective members, and the MSB of each member 647 * is zero-filled. The frequency member always occupies the full 16 bits. 648 */ 649 650 typedef struct png_sPLT_struct 651 { 652 png_charp name; /* palette name */ 653 png_byte depth; /* depth of palette samples */ 654 png_sPLT_entryp entries; /* palette entries */ 655 png_int_32 nentries; /* number of palette entries */ 656 } png_sPLT_t; 657 typedef png_sPLT_t FAR * png_sPLT_tp; 658 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 659 660 #ifdef PNG_TEXT_SUPPORTED 661 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 662 * and whether that contents is compressed or not. The "key" field 663 * points to a regular zero-terminated C string. The "text", "lang", and 664 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 665 * However, the * structure returned by png_get_text() will always contain 666 * regular zero-terminated C strings (possibly empty), never NULL pointers, 667 * so they can be safely used in printf() and other string-handling functions. 668 */ 669 typedef struct png_text_struct 670 { 671 int compression; /* compression value: 672 -1: tEXt, none 673 0: zTXt, deflate 674 1: iTXt, none 675 2: iTXt, deflate */ 676 png_charp key; /* keyword, 1-79 character description of "text" */ 677 png_charp text; /* comment, may be an empty string (ie "") 678 or a NULL pointer */ 679 png_size_t text_length; /* length of the text string */ 680 #ifdef PNG_iTXt_SUPPORTED 681 png_size_t itxt_length; /* length of the itxt string */ 682 png_charp lang; /* language code, 0-79 characters 683 or a NULL pointer */ 684 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 685 chars or a NULL pointer */ 686 #endif 687 } png_text; 688 typedef png_text FAR * png_textp; 689 typedef png_text FAR * FAR * png_textpp; 690 #endif 691 692 /* Supported compression types for text in PNG files (tEXt, and zTXt). 693 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 694 */ 695 #define PNG_TEXT_COMPRESSION_NONE_WR -3 696 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 697 #define PNG_TEXT_COMPRESSION_NONE -1 698 #define PNG_TEXT_COMPRESSION_zTXt 0 699 #define PNG_ITXT_COMPRESSION_NONE 1 700 #define PNG_ITXT_COMPRESSION_zTXt 2 701 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 702 703 /* png_time is a way to hold the time in an machine independent way. 704 * Two conversions are provided, both from time_t and struct tm. There 705 * is no portable way to convert to either of these structures, as far 706 * as I know. If you know of a portable way, send it to me. As a side 707 * note - PNG has always been Year 2000 compliant! 708 */ 709 typedef struct png_time_struct 710 { 711 png_uint_16 year; /* full year, as in, 1995 */ 712 png_byte month; /* month of year, 1 - 12 */ 713 png_byte day; /* day of month, 1 - 31 */ 714 png_byte hour; /* hour of day, 0 - 23 */ 715 png_byte minute; /* minute of hour, 0 - 59 */ 716 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 717 } png_time; 718 typedef png_time FAR * png_timep; 719 typedef png_time FAR * FAR * png_timepp; 720 721 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 722 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 723 /* png_unknown_chunk is a structure to hold queued chunks for which there is 724 * no specific support. The idea is that we can use this to queue 725 * up private chunks for output even though the library doesn't actually 726 * know about their semantics. 727 */ 728 #define PNG_CHUNK_NAME_LENGTH 5 729 typedef struct png_unknown_chunk_t 730 { 731 png_byte name[PNG_CHUNK_NAME_LENGTH]; 732 png_byte *data; 733 png_size_t size; 734 735 /* libpng-using applications should NOT directly modify this byte. */ 736 png_byte location; /* mode of operation at read time */ 737 } 738 png_unknown_chunk; 739 typedef png_unknown_chunk FAR * png_unknown_chunkp; 740 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 741 #endif 742 743 /* png_info is a structure that holds the information in a PNG file so 744 * that the application can find out the characteristics of the image. 745 * If you are reading the file, this structure will tell you what is 746 * in the PNG file. If you are writing the file, fill in the information 747 * you want to put into the PNG file, then call png_write_info(). 748 * The names chosen should be very close to the PNG specification, so 749 * consult that document for information about the meaning of each field. 750 * 751 * With libpng < 0.95, it was only possible to directly set and read the 752 * the values in the png_info_struct, which meant that the contents and 753 * order of the values had to remain fixed. With libpng 0.95 and later, 754 * however, there are now functions that abstract the contents of 755 * png_info_struct from the application, so this makes it easier to use 756 * libpng with dynamic libraries, and even makes it possible to use 757 * libraries that don't have all of the libpng ancillary chunk-handing 758 * functionality. 759 * 760 * In any case, the order of the parameters in png_info_struct should NOT 761 * be changed for as long as possible to keep compatibility with applications 762 * that use the old direct-access method with png_info_struct. 763 * 764 * The following members may have allocated storage attached that should be 765 * cleaned up before the structure is discarded: palette, trans, text, 766 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 767 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 768 * are automatically freed when the info structure is deallocated, if they were 769 * allocated internally by libpng. This behavior can be changed by means 770 * of the png_data_freer() function. 771 * 772 * More allocation details: all the chunk-reading functions that 773 * change these members go through the corresponding png_set_* 774 * functions. A function to clear these members is available: see 775 * png_free_data(). The png_set_* functions do not depend on being 776 * able to point info structure members to any of the storage they are 777 * passed (they make their own copies), EXCEPT that the png_set_text 778 * functions use the same storage passed to them in the text_ptr or 779 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 780 * functions do not make their own copies. 781 */ 782 typedef struct png_info_struct 783 { 784 /* the following are necessary for every PNG file */ 785 png_uint_32 width; /* width of image in pixels (from IHDR) */ 786 png_uint_32 height; /* height of image in pixels (from IHDR) */ 787 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 788 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 789 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 790 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 791 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 792 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 793 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 794 /* The following three should have been named *_method not *_type */ 795 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 796 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 797 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 798 799 /* The following is informational only on read, and not used on writes. */ 800 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 801 png_byte pixel_depth; /* number of bits per pixel */ 802 png_byte spare_byte; /* to align the data, and for future use */ 803 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 804 805 /* The rest of the data is optional. If you are reading, check the 806 * valid field to see if the information in these are valid. If you 807 * are writing, set the valid field to those chunks you want written, 808 * and initialize the appropriate fields below. 809 */ 810 811 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 812 /* The gAMA chunk describes the gamma characteristics of the system 813 * on which the image was created, normally in the range [1.0, 2.5]. 814 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 815 */ 816 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 817 #endif 818 819 #if defined(PNG_sRGB_SUPPORTED) 820 /* GR-P, 0.96a */ 821 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 822 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 823 #endif 824 825 #if defined(PNG_TEXT_SUPPORTED) 826 /* The tEXt, and zTXt chunks contain human-readable textual data in 827 * uncompressed, compressed, and optionally compressed forms, respectively. 828 * The data in "text" is an array of pointers to uncompressed, 829 * null-terminated C strings. Each chunk has a keyword that describes the 830 * textual data contained in that chunk. Keywords are not required to be 831 * unique, and the text string may be empty. Any number of text chunks may 832 * be in an image. 833 */ 834 int num_text; /* number of comments read/to write */ 835 int max_text; /* current size of text array */ 836 png_textp text; /* array of comments read/to write */ 837 #endif /* PNG_TEXT_SUPPORTED */ 838 839 #if defined(PNG_tIME_SUPPORTED) 840 /* The tIME chunk holds the last time the displayed image data was 841 * modified. See the png_time struct for the contents of this struct. 842 */ 843 png_time mod_time; 844 #endif 845 846 #if defined(PNG_sBIT_SUPPORTED) 847 /* The sBIT chunk specifies the number of significant high-order bits 848 * in the pixel data. Values are in the range [1, bit_depth], and are 849 * only specified for the channels in the pixel data. The contents of 850 * the low-order bits is not specified. Data is valid if 851 * (valid & PNG_INFO_sBIT) is non-zero. 852 */ 853 png_color_8 sig_bit; /* significant bits in color channels */ 854 #endif 855 856 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 857 defined(PNG_READ_BACKGROUND_SUPPORTED) 858 /* The tRNS chunk supplies transparency data for paletted images and 859 * other image types that don't need a full alpha channel. There are 860 * "num_trans" transparency values for a paletted image, stored in the 861 * same order as the palette colors, starting from index 0. Values 862 * for the data are in the range [0, 255], ranging from fully transparent 863 * to fully opaque, respectively. For non-paletted images, there is a 864 * single color specified that should be treated as fully transparent. 865 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 866 */ 867 png_bytep trans; /* transparent values for paletted image */ 868 png_color_16 trans_values; /* transparent color for non-palette image */ 869 #endif 870 871 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 872 /* The bKGD chunk gives the suggested image background color if the 873 * display program does not have its own background color and the image 874 * is needs to composited onto a background before display. The colors 875 * in "background" are normally in the same color space/depth as the 876 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 877 */ 878 png_color_16 background; 879 #endif 880 881 #if defined(PNG_oFFs_SUPPORTED) 882 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 883 * and downwards from the top-left corner of the display, page, or other 884 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 885 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 886 */ 887 png_int_32 x_offset; /* x offset on page */ 888 png_int_32 y_offset; /* y offset on page */ 889 png_byte offset_unit_type; /* offset units type */ 890 #endif 891 892 #if defined(PNG_pHYs_SUPPORTED) 893 /* The pHYs chunk gives the physical pixel density of the image for 894 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 895 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 896 */ 897 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 898 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 899 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 900 #endif 901 902 #if defined(PNG_hIST_SUPPORTED) 903 /* The hIST chunk contains the relative frequency or importance of the 904 * various palette entries, so that a viewer can intelligently select a 905 * reduced-color palette, if required. Data is an array of "num_palette" 906 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 907 * is non-zero. 908 */ 909 png_uint_16p hist; 910 #endif 911 912 #ifdef PNG_cHRM_SUPPORTED 913 /* The cHRM chunk describes the CIE color characteristics of the monitor 914 * on which the PNG was created. This data allows the viewer to do gamut 915 * mapping of the input image to ensure that the viewer sees the same 916 * colors in the image as the creator. Values are in the range 917 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 918 */ 919 #ifdef PNG_FLOATING_POINT_SUPPORTED 920 float x_white; 921 float y_white; 922 float x_red; 923 float y_red; 924 float x_green; 925 float y_green; 926 float x_blue; 927 float y_blue; 928 #endif 929 #endif 930 931 #if defined(PNG_pCAL_SUPPORTED) 932 /* The pCAL chunk describes a transformation between the stored pixel 933 * values and original physical data values used to create the image. 934 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 935 * range given by [pcal_X0, pcal_X1], and are further transformed by a 936 * (possibly non-linear) transformation function given by "pcal_type" 937 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 938 * defines below, and the PNG-Group's PNG extensions document for a 939 * complete description of the transformations and how they should be 940 * implemented, and for a description of the ASCII parameter strings. 941 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 942 */ 943 png_charp pcal_purpose; /* pCAL chunk description string */ 944 png_int_32 pcal_X0; /* minimum value */ 945 png_int_32 pcal_X1; /* maximum value */ 946 png_charp pcal_units; /* Latin-1 string giving physical units */ 947 png_charpp pcal_params; /* ASCII strings containing parameter values */ 948 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 949 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 950 #endif 951 952 /* New members added in libpng-1.0.6 */ 953 #ifdef PNG_FREE_ME_SUPPORTED 954 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 955 #endif 956 957 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 958 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 959 /* Storage for unknown chunks that the library doesn't recognize. */ 960 png_unknown_chunkp unknown_chunks; 961 png_size_t unknown_chunks_num; 962 #endif 963 964 #if defined(PNG_iCCP_SUPPORTED) 965 /* iCCP chunk data. */ 966 png_charp iccp_name; /* profile name */ 967 png_charp iccp_profile; /* International Color Consortium profile data */ 968 /* Note to maintainer: should be png_bytep */ 969 png_uint_32 iccp_proflen; /* ICC profile data length */ 970 png_byte iccp_compression; /* Always zero */ 971 #endif 972 973 #if defined(PNG_sPLT_SUPPORTED) 974 /* Data on sPLT chunks (there may be more than one). */ 975 png_sPLT_tp splt_palettes; 976 png_uint_32 splt_palettes_num; 977 #endif 978 979 #if defined(PNG_sCAL_SUPPORTED) 980 /* The sCAL chunk describes the actual physical dimensions of the 981 * subject matter of the graphic. The chunk contains a unit specification 982 * a byte value, and two ASCII strings representing floating-point 983 * values. The values are width and height corresponsing to one pixel 984 * in the image. This external representation is converted to double 985 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 986 */ 987 png_byte scal_unit; /* unit of physical scale */ 988 #ifdef PNG_FLOATING_POINT_SUPPORTED 989 double scal_pixel_width; /* width of one pixel */ 990 double scal_pixel_height; /* height of one pixel */ 991 #endif 992 #ifdef PNG_FIXED_POINT_SUPPORTED 993 png_charp scal_s_width; /* string containing height */ 994 png_charp scal_s_height; /* string containing width */ 995 #endif 996 #endif 997 998 #if defined(PNG_INFO_IMAGE_SUPPORTED) 999 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1000 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1001 png_bytepp row_pointers; /* the image bits */ 1002 #endif 1003 1004 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1005 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1006 #endif 1007 1008 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1009 png_fixed_point int_x_white; 1010 png_fixed_point int_y_white; 1011 png_fixed_point int_x_red; 1012 png_fixed_point int_y_red; 1013 png_fixed_point int_x_green; 1014 png_fixed_point int_y_green; 1015 png_fixed_point int_x_blue; 1016 png_fixed_point int_y_blue; 1017 #endif 1018 1019 } png_info; 1020 1021 typedef png_info FAR * png_infop; 1022 typedef png_info FAR * FAR * png_infopp; 1023 1024 /* Maximum positive integer used in PNG is (2^31)-1 */ 1025 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1026 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1027 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1028 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1029 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1030 #define PNG_MAX_UINT PNG_UINT_31_MAX 1031 #endif 1032 1033 /* These describe the color_type field in png_info. */ 1034 /* color type masks */ 1035 #define PNG_COLOR_MASK_PALETTE 1 1036 #define PNG_COLOR_MASK_COLOR 2 1037 #define PNG_COLOR_MASK_ALPHA 4 1038 1039 /* color types. Note that not all combinations are legal */ 1040 #define PNG_COLOR_TYPE_GRAY 0 1041 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1042 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1043 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1044 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1045 /* aliases */ 1046 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1047 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1048 1049 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1050 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1051 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1052 1053 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1054 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1055 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1056 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1057 1058 /* These are for the interlacing type. These values should NOT be changed. */ 1059 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1060 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1061 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1062 1063 /* These are for the oFFs chunk. These values should NOT be changed. */ 1064 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1065 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1066 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1067 1068 /* These are for the pCAL chunk. These values should NOT be changed. */ 1069 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1070 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1071 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1072 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1073 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1074 1075 /* These are for the sCAL chunk. These values should NOT be changed. */ 1076 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1077 #define PNG_SCALE_METER 1 /* meters per pixel */ 1078 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1079 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1080 1081 /* These are for the pHYs chunk. These values should NOT be changed. */ 1082 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1083 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1084 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1085 1086 /* These are for the sRGB chunk. These values should NOT be changed. */ 1087 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1088 #define PNG_sRGB_INTENT_RELATIVE 1 1089 #define PNG_sRGB_INTENT_SATURATION 2 1090 #define PNG_sRGB_INTENT_ABSOLUTE 3 1091 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1092 1093 /* This is for text chunks */ 1094 #define PNG_KEYWORD_MAX_LENGTH 79 1095 1096 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1097 #define PNG_MAX_PALETTE_LENGTH 256 1098 1099 /* These determine if an ancillary chunk's data has been successfully read 1100 * from the PNG header, or if the application has filled in the corresponding 1101 * data in the info_struct to be written into the output file. The values 1102 * of the PNG_INFO_<chunk> defines should NOT be changed. 1103 */ 1104 #define PNG_INFO_gAMA 0x0001 1105 #define PNG_INFO_sBIT 0x0002 1106 #define PNG_INFO_cHRM 0x0004 1107 #define PNG_INFO_PLTE 0x0008 1108 #define PNG_INFO_tRNS 0x0010 1109 #define PNG_INFO_bKGD 0x0020 1110 #define PNG_INFO_hIST 0x0040 1111 #define PNG_INFO_pHYs 0x0080 1112 #define PNG_INFO_oFFs 0x0100 1113 #define PNG_INFO_tIME 0x0200 1114 #define PNG_INFO_pCAL 0x0400 1115 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1116 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1117 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1118 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1119 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1120 1121 /* This is used for the transformation routines, as some of them 1122 * change these values for the row. It also should enable using 1123 * the routines for other purposes. 1124 */ 1125 typedef struct png_row_info_struct 1126 { 1127 png_uint_32 width; /* width of row */ 1128 png_uint_32 rowbytes; /* number of bytes in row */ 1129 png_byte color_type; /* color type of row */ 1130 png_byte bit_depth; /* bit depth of row */ 1131 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1132 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1133 } png_row_info; 1134 1135 typedef png_row_info FAR * png_row_infop; 1136 typedef png_row_info FAR * FAR * png_row_infopp; 1137 1138 /* These are the function types for the I/O functions and for the functions 1139 * that allow the user to override the default I/O functions with his or her 1140 * own. The png_error_ptr type should match that of user-supplied warning 1141 * and error functions, while the png_rw_ptr type should match that of the 1142 * user read/write data functions. 1143 */ 1144 typedef struct png_struct_def png_struct; 1145 typedef png_struct FAR * png_structp; 1146 1147 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1148 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1149 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1150 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1151 int)); 1152 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1153 int)); 1154 1155 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1156 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1157 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1158 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1159 png_uint_32, int)); 1160 #endif 1161 1162 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1163 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1164 defined(PNG_LEGACY_SUPPORTED) 1165 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1166 png_row_infop, png_bytep)); 1167 #endif 1168 1169 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1170 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1171 #endif 1172 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1173 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1174 #endif 1175 1176 /* Transform masks for the high-level interface */ 1177 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1178 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1179 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1180 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1181 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1182 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1183 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1184 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1185 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1186 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1187 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1188 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1189 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */ 1190 /* Added to libpng-1.2.34 */ 1191 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */ 1192 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */ 1193 1194 /* Flags for MNG supported features */ 1195 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1196 #define PNG_FLAG_MNG_FILTER_64 0x04 1197 #define PNG_ALL_MNG_FEATURES 0x05 1198 1199 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1200 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1201 1202 /* The structure that holds the information to read and write PNG files. 1203 * The only people who need to care about what is inside of this are the 1204 * people who will be modifying the library for their own special needs. 1205 * It should NOT be accessed directly by an application, except to store 1206 * the jmp_buf. 1207 */ 1208 1209 struct png_struct_def 1210 { 1211 #ifdef PNG_SETJMP_SUPPORTED 1212 jmp_buf jmpbuf; /* used in png_error */ 1213 #endif 1214 png_error_ptr error_fn; /* function for printing errors and aborting */ 1215 png_error_ptr warning_fn; /* function for printing warnings */ 1216 png_voidp error_ptr; /* user supplied struct for error functions */ 1217 png_rw_ptr write_data_fn; /* function for writing output data */ 1218 png_rw_ptr read_data_fn; /* function for reading input data */ 1219 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1220 1221 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1222 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1223 #endif 1224 1225 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1226 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1227 #endif 1228 1229 /* These were added in libpng-1.0.2 */ 1230 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1231 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1232 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1233 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1234 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1235 png_byte user_transform_channels; /* channels in user transformed pixels */ 1236 #endif 1237 #endif 1238 1239 png_uint_32 mode; /* tells us where we are in the PNG file */ 1240 png_uint_32 flags; /* flags indicating various things to libpng */ 1241 png_uint_32 transformations; /* which transformations to perform */ 1242 1243 z_stream zstream; /* pointer to decompression structure (below) */ 1244 png_bytep zbuf; /* buffer for zlib */ 1245 png_size_t zbuf_size; /* size of zbuf */ 1246 int zlib_level; /* holds zlib compression level */ 1247 int zlib_method; /* holds zlib compression method */ 1248 int zlib_window_bits; /* holds zlib compression window bits */ 1249 int zlib_mem_level; /* holds zlib compression memory level */ 1250 int zlib_strategy; /* holds zlib compression strategy */ 1251 1252 png_uint_32 width; /* width of image in pixels */ 1253 png_uint_32 height; /* height of image in pixels */ 1254 png_uint_32 num_rows; /* number of rows in current pass */ 1255 png_uint_32 usr_width; /* width of row at start of write */ 1256 png_uint_32 rowbytes; /* size of row in bytes */ 1257 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1258 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1259 png_uint_32 row_number; /* current row in interlace pass */ 1260 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1261 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1262 #ifndef PNG_NO_WRITE_FILTER 1263 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1264 png_bytep up_row; /* buffer to save "up" row when filtering */ 1265 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1266 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1267 #endif 1268 png_row_info row_info; /* used for transformation routines */ 1269 1270 png_uint_32 idat_size; /* current IDAT size for read */ 1271 png_uint_32 crc; /* current chunk CRC value */ 1272 png_colorp palette; /* palette from the input file */ 1273 png_uint_16 num_palette; /* number of color entries in palette */ 1274 png_uint_16 num_trans; /* number of transparency values */ 1275 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1276 png_byte compression; /* file compression type (always 0) */ 1277 png_byte filter; /* file filter type (always 0) */ 1278 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1279 png_byte pass; /* current interlace pass (0 - 6) */ 1280 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1281 png_byte color_type; /* color type of file */ 1282 png_byte bit_depth; /* bit depth of file */ 1283 png_byte usr_bit_depth; /* bit depth of users row */ 1284 png_byte pixel_depth; /* number of bits per pixel */ 1285 png_byte channels; /* number of channels in file */ 1286 png_byte usr_channels; /* channels at start of write */ 1287 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1288 1289 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1290 #ifdef PNG_LEGACY_SUPPORTED 1291 png_byte filler; /* filler byte for pixel expansion */ 1292 #else 1293 png_uint_16 filler; /* filler bytes for pixel expansion */ 1294 #endif 1295 #endif 1296 1297 #if defined(PNG_bKGD_SUPPORTED) 1298 png_byte background_gamma_type; 1299 # ifdef PNG_FLOATING_POINT_SUPPORTED 1300 float background_gamma; 1301 # endif 1302 png_color_16 background; /* background color in screen gamma space */ 1303 #if defined(PNG_READ_GAMMA_SUPPORTED) 1304 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1305 #endif 1306 #endif /* PNG_bKGD_SUPPORTED */ 1307 1308 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1309 png_flush_ptr output_flush_fn; /* Function for flushing output */ 1310 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1311 png_uint_32 flush_rows; /* number of rows written since last flush */ 1312 #endif 1313 1314 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1315 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1316 #ifdef PNG_FLOATING_POINT_SUPPORTED 1317 float gamma; /* file gamma value */ 1318 float screen_gamma; /* screen gamma value (display_exponent) */ 1319 #endif 1320 #endif 1321 1322 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1323 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1324 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1325 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1326 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1327 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1328 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1329 #endif 1330 1331 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1332 png_color_8 sig_bit; /* significant bits in each available channel */ 1333 #endif 1334 1335 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1336 png_color_8 shift; /* shift for significant bit tranformation */ 1337 #endif 1338 1339 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1340 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1341 png_bytep trans; /* transparency values for paletted files */ 1342 png_color_16 trans_values; /* transparency values for non-paletted files */ 1343 #endif 1344 1345 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1346 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1347 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1348 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1349 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1350 png_progressive_end_ptr end_fn; /* called after image is complete */ 1351 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1352 png_bytep save_buffer; /* buffer for previously read data */ 1353 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1354 png_bytep current_buffer; /* buffer for recently used data */ 1355 png_uint_32 push_length; /* size of current input chunk */ 1356 png_uint_32 skip_length; /* bytes to skip in input data */ 1357 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1358 png_size_t save_buffer_max; /* total size of save_buffer */ 1359 png_size_t buffer_size; /* total amount of available input data */ 1360 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1361 int process_mode; /* what push library is currently doing */ 1362 int cur_palette; /* current push library palette index */ 1363 1364 # if defined(PNG_TEXT_SUPPORTED) 1365 png_size_t current_text_size; /* current size of text input data */ 1366 png_size_t current_text_left; /* how much text left to read in input */ 1367 png_charp current_text; /* current text chunk buffer */ 1368 png_charp current_text_ptr; /* current location in current_text */ 1369 # endif /* PNG_TEXT_SUPPORTED */ 1370 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1371 1372 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1373 /* for the Borland special 64K segment handler */ 1374 png_bytepp offset_table_ptr; 1375 png_bytep offset_table; 1376 png_uint_16 offset_table_number; 1377 png_uint_16 offset_table_count; 1378 png_uint_16 offset_table_count_free; 1379 #endif 1380 1381 #if defined(PNG_READ_DITHER_SUPPORTED) 1382 png_bytep palette_lookup; /* lookup table for dithering */ 1383 png_bytep dither_index; /* index translation for palette files */ 1384 #endif 1385 1386 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1387 png_uint_16p hist; /* histogram */ 1388 #endif 1389 1390 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1391 png_byte heuristic_method; /* heuristic for row filter selection */ 1392 png_byte num_prev_filters; /* number of weights for previous rows */ 1393 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1394 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1395 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1396 png_uint_16p filter_costs; /* relative filter calculation cost */ 1397 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1398 #endif 1399 1400 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1401 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1402 #endif 1403 1404 /* New members added in libpng-1.0.6 */ 1405 1406 #ifdef PNG_FREE_ME_SUPPORTED 1407 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1408 #endif 1409 1410 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1411 png_voidp user_chunk_ptr; 1412 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1413 #endif 1414 1415 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1416 int num_chunk_list; 1417 png_bytep chunk_list; 1418 #endif 1419 1420 /* New members added in libpng-1.0.3 */ 1421 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1422 png_byte rgb_to_gray_status; 1423 /* These were changed from png_byte in libpng-1.0.6 */ 1424 png_uint_16 rgb_to_gray_red_coeff; 1425 png_uint_16 rgb_to_gray_green_coeff; 1426 png_uint_16 rgb_to_gray_blue_coeff; 1427 #endif 1428 1429 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1430 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1431 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1432 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1433 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1434 #ifdef PNG_1_0_X 1435 png_byte mng_features_permitted; 1436 #else 1437 png_uint_32 mng_features_permitted; 1438 #endif /* PNG_1_0_X */ 1439 #endif 1440 1441 /* New member added in libpng-1.0.7 */ 1442 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1443 png_fixed_point int_gamma; 1444 #endif 1445 1446 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1447 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1448 png_byte filter_type; 1449 #endif 1450 1451 #if defined(PNG_1_0_X) 1452 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1453 png_uint_32 row_buf_size; 1454 #endif 1455 1456 /* New members added in libpng-1.2.0 */ 1457 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1458 # if !defined(PNG_1_0_X) 1459 # if defined(PNG_MMX_CODE_SUPPORTED) 1460 png_byte mmx_bitdepth_threshold; 1461 png_uint_32 mmx_rowbytes_threshold; 1462 # endif 1463 png_uint_32 asm_flags; 1464 # endif 1465 #endif 1466 1467 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1468 #ifdef PNG_USER_MEM_SUPPORTED 1469 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1470 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1471 png_free_ptr free_fn; /* function for freeing memory */ 1472 #endif 1473 1474 /* New member added in libpng-1.0.13 and 1.2.0 */ 1475 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1476 1477 #if defined(PNG_READ_DITHER_SUPPORTED) 1478 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1479 png_bytep dither_sort; /* working sort array */ 1480 png_bytep index_to_palette; /* where the original index currently is */ 1481 /* in the palette */ 1482 png_bytep palette_to_index; /* which original index points to this */ 1483 /* palette color */ 1484 #endif 1485 1486 /* New members added in libpng-1.0.16 and 1.2.6 */ 1487 png_byte compression_type; 1488 1489 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1490 png_uint_32 user_width_max; 1491 png_uint_32 user_height_max; 1492 #endif 1493 1494 /* New member added in libpng-1.0.25 and 1.2.17 */ 1495 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1496 /* Storage for unknown chunk that the library doesn't recognize. */ 1497 png_unknown_chunk unknown_chunk; 1498 #endif 1499 1500 /* New members added in libpng-1.2.26 */ 1501 png_uint_32 old_big_row_buf_size, old_prev_row_size; 1502 1503 /* New member added in libpng-1.2.30 */ 1504 png_charp chunkdata; /* buffer for reading chunk data */ 1505 1506 }; 1507 1508 1509 /* This triggers a compiler error in png.c, if png.c and png.h 1510 * do not agree upon the version number. 1511 */ 1512 typedef png_structp version_1_2_38; 1513 1514 typedef png_struct FAR * FAR * png_structpp; 1515 1516 /* Here are the function definitions most commonly used. This is not 1517 * the place to find out how to use libpng. See libpng.txt for the 1518 * full explanation, see example.c for the summary. This just provides 1519 * a simple one line description of the use of each function. 1520 */ 1521 1522 /* Returns the version number of the library */ 1523 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1524 1525 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1526 * Handling more than 8 bytes from the beginning of the file is an error. 1527 */ 1528 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1529 int num_bytes)); 1530 1531 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1532 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1533 * signature, and non-zero otherwise. Having num_to_check == 0 or 1534 * start > 7 will always fail (ie return non-zero). 1535 */ 1536 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1537 png_size_t num_to_check)); 1538 1539 /* Simple signature checking function. This is the same as calling 1540 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1541 */ 1542 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1543 1544 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1545 extern PNG_EXPORT(png_structp,png_create_read_struct) 1546 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1547 png_error_ptr error_fn, png_error_ptr warn_fn)); 1548 1549 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1550 extern PNG_EXPORT(png_structp,png_create_write_struct) 1551 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1552 png_error_ptr error_fn, png_error_ptr warn_fn)); 1553 1554 #ifdef PNG_WRITE_SUPPORTED 1555 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1556 PNGARG((png_structp png_ptr)); 1557 #endif 1558 1559 #ifdef PNG_WRITE_SUPPORTED 1560 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1561 PNGARG((png_structp png_ptr, png_uint_32 size)); 1562 #endif 1563 1564 /* Reset the compression stream */ 1565 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1566 1567 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1568 #ifdef PNG_USER_MEM_SUPPORTED 1569 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1570 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1571 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1572 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1573 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1574 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1575 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1576 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1577 #endif 1578 1579 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1580 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1581 png_bytep chunk_name, png_bytep data, png_size_t length)); 1582 1583 /* Write the start of a PNG chunk - length and chunk name. */ 1584 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1585 png_bytep chunk_name, png_uint_32 length)); 1586 1587 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1588 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1589 png_bytep data, png_size_t length)); 1590 1591 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1592 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1593 1594 /* Allocate and initialize the info structure */ 1595 extern PNG_EXPORT(png_infop,png_create_info_struct) 1596 PNGARG((png_structp png_ptr)); 1597 1598 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1599 /* Initialize the info structure (old interface - DEPRECATED) */ 1600 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1601 #undef png_info_init 1602 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1603 png_sizeof(png_info)); 1604 #endif 1605 1606 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1607 png_size_t png_info_struct_size)); 1608 1609 /* Writes all the PNG information before the image. */ 1610 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1611 png_infop info_ptr)); 1612 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1613 png_infop info_ptr)); 1614 1615 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1616 /* Read the information before the actual image data. */ 1617 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1618 png_infop info_ptr)); 1619 #endif 1620 1621 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1622 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1623 PNGARG((png_structp png_ptr, png_timep ptime)); 1624 #endif 1625 1626 #if !defined(_WIN32_WCE) 1627 /* "time.h" functions are not supported on WindowsCE */ 1628 #if defined(PNG_WRITE_tIME_SUPPORTED) 1629 /* Convert from a struct tm to png_time */ 1630 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1631 struct tm FAR * ttime)); 1632 1633 /* Convert from time_t to png_time. Uses gmtime() */ 1634 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1635 time_t ttime)); 1636 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1637 #endif /* _WIN32_WCE */ 1638 1639 #if defined(PNG_READ_EXPAND_SUPPORTED) 1640 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1641 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1642 #if !defined(PNG_1_0_X) 1643 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1644 png_ptr)); 1645 #endif 1646 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1647 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1648 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1649 /* Deprecated */ 1650 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1651 #endif 1652 #endif 1653 1654 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1655 /* Use blue, green, red order for pixels. */ 1656 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1657 #endif 1658 1659 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1660 /* Expand the grayscale to 24-bit RGB if necessary. */ 1661 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1662 #endif 1663 1664 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1665 /* Reduce RGB to grayscale. */ 1666 #ifdef PNG_FLOATING_POINT_SUPPORTED 1667 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1668 int error_action, double red, double green )); 1669 #endif 1670 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1671 int error_action, png_fixed_point red, png_fixed_point green )); 1672 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1673 png_ptr)); 1674 #endif 1675 1676 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1677 png_colorp palette)); 1678 1679 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1680 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1681 #endif 1682 1683 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1684 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1685 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1686 #endif 1687 1688 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1689 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1690 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1691 #endif 1692 1693 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1694 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1695 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1696 png_uint_32 filler, int flags)); 1697 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1698 #define PNG_FILLER_BEFORE 0 1699 #define PNG_FILLER_AFTER 1 1700 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1701 #if !defined(PNG_1_0_X) 1702 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1703 png_uint_32 filler, int flags)); 1704 #endif 1705 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1706 1707 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1708 /* Swap bytes in 16-bit depth files. */ 1709 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1710 #endif 1711 1712 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1713 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1714 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1715 #endif 1716 1717 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1718 /* Swap packing order of pixels in bytes. */ 1719 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1720 #endif 1721 1722 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1723 /* Converts files to legal bit depths. */ 1724 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1725 png_color_8p true_bits)); 1726 #endif 1727 1728 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1729 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1730 /* Have the code handle the interlacing. Returns the number of passes. */ 1731 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1732 #endif 1733 1734 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1735 /* Invert monochrome files */ 1736 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1737 #endif 1738 1739 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1740 /* Handle alpha and tRNS by replacing with a background color. */ 1741 #ifdef PNG_FLOATING_POINT_SUPPORTED 1742 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1743 png_color_16p background_color, int background_gamma_code, 1744 int need_expand, double background_gamma)); 1745 #endif 1746 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1747 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1748 #define PNG_BACKGROUND_GAMMA_FILE 2 1749 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1750 #endif 1751 1752 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1753 /* Strip the second byte of information from a 16-bit depth file. */ 1754 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1755 #endif 1756 1757 #if defined(PNG_READ_DITHER_SUPPORTED) 1758 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1759 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1760 png_colorp palette, int num_palette, int maximum_colors, 1761 png_uint_16p histogram, int full_dither)); 1762 #endif 1763 1764 #if defined(PNG_READ_GAMMA_SUPPORTED) 1765 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1766 #ifdef PNG_FLOATING_POINT_SUPPORTED 1767 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1768 double screen_gamma, double default_file_gamma)); 1769 #endif 1770 #endif 1771 1772 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1773 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1774 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1775 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1776 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1777 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1778 int empty_plte_permitted)); 1779 #endif 1780 #endif 1781 1782 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1783 /* Set how many lines between output flushes - 0 for no flushing */ 1784 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1785 /* Flush the current PNG output buffer */ 1786 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1787 #endif 1788 1789 /* Optional update palette with requested transformations */ 1790 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1791 1792 /* Optional call to update the users info structure */ 1793 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1794 png_infop info_ptr)); 1795 1796 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1797 /* Read one or more rows of image data. */ 1798 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1799 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1800 #endif 1801 1802 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1803 /* Read a row of data. */ 1804 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1805 png_bytep row, 1806 png_bytep display_row)); 1807 #endif 1808 1809 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1810 /* Read the whole image into memory at once. */ 1811 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1812 png_bytepp image)); 1813 #endif 1814 1815 /* Write a row of image data */ 1816 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1817 png_bytep row)); 1818 1819 /* Write a few rows of image data */ 1820 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1821 png_bytepp row, png_uint_32 num_rows)); 1822 1823 /* Write the image data */ 1824 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1825 png_bytepp image)); 1826 1827 /* Writes the end of the PNG file. */ 1828 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1829 png_infop info_ptr)); 1830 1831 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1832 /* Read the end of the PNG file. */ 1833 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1834 png_infop info_ptr)); 1835 #endif 1836 1837 /* Free any memory associated with the png_info_struct */ 1838 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1839 png_infopp info_ptr_ptr)); 1840 1841 /* Free any memory associated with the png_struct and the png_info_structs */ 1842 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1843 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1844 1845 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1846 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1847 png_infop end_info_ptr)); 1848 1849 /* Free any memory associated with the png_struct and the png_info_structs */ 1850 extern PNG_EXPORT(void,png_destroy_write_struct) 1851 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1852 1853 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1854 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1855 1856 /* Set the libpng method of handling chunk CRC errors */ 1857 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1858 int crit_action, int ancil_action)); 1859 1860 /* Values for png_set_crc_action() to say how to handle CRC errors in 1861 * ancillary and critical chunks, and whether to use the data contained 1862 * therein. Note that it is impossible to "discard" data in a critical 1863 * chunk. For versions prior to 0.90, the action was always error/quit, 1864 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1865 * chunks is warn/discard. These values should NOT be changed. 1866 * 1867 * value action:critical action:ancillary 1868 */ 1869 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1870 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1871 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1872 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1873 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1874 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1875 1876 /* These functions give the user control over the scan-line filtering in 1877 * libpng and the compression methods used by zlib. These functions are 1878 * mainly useful for testing, as the defaults should work with most users. 1879 * Those users who are tight on memory or want faster performance at the 1880 * expense of compression can modify them. See the compression library 1881 * header file (zlib.h) for an explination of the compression functions. 1882 */ 1883 1884 /* Set the filtering method(s) used by libpng. Currently, the only valid 1885 * value for "method" is 0. 1886 */ 1887 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1888 int filters)); 1889 1890 /* Flags for png_set_filter() to say which filters to use. The flags 1891 * are chosen so that they don't conflict with real filter types 1892 * below, in case they are supplied instead of the #defined constants. 1893 * These values should NOT be changed. 1894 */ 1895 #define PNG_NO_FILTERS 0x00 1896 #define PNG_FILTER_NONE 0x08 1897 #define PNG_FILTER_SUB 0x10 1898 #define PNG_FILTER_UP 0x20 1899 #define PNG_FILTER_AVG 0x40 1900 #define PNG_FILTER_PAETH 0x80 1901 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1902 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1903 1904 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1905 * These defines should NOT be changed. 1906 */ 1907 #define PNG_FILTER_VALUE_NONE 0 1908 #define PNG_FILTER_VALUE_SUB 1 1909 #define PNG_FILTER_VALUE_UP 2 1910 #define PNG_FILTER_VALUE_AVG 3 1911 #define PNG_FILTER_VALUE_PAETH 4 1912 #define PNG_FILTER_VALUE_LAST 5 1913 1914 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1915 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1916 * defines, either the default (minimum-sum-of-absolute-differences), or 1917 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1918 * 1919 * Weights are factors >= 1.0, indicating how important it is to keep the 1920 * filter type consistent between rows. Larger numbers mean the current 1921 * filter is that many times as likely to be the same as the "num_weights" 1922 * previous filters. This is cumulative for each previous row with a weight. 1923 * There needs to be "num_weights" values in "filter_weights", or it can be 1924 * NULL if the weights aren't being specified. Weights have no influence on 1925 * the selection of the first row filter. Well chosen weights can (in theory) 1926 * improve the compression for a given image. 1927 * 1928 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1929 * filter type. Higher costs indicate more decoding expense, and are 1930 * therefore less likely to be selected over a filter with lower computational 1931 * costs. There needs to be a value in "filter_costs" for each valid filter 1932 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1933 * setting the costs. Costs try to improve the speed of decompression without 1934 * unduly increasing the compressed image size. 1935 * 1936 * A negative weight or cost indicates the default value is to be used, and 1937 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1938 * The default values for both weights and costs are currently 1.0, but may 1939 * change if good general weighting/cost heuristics can be found. If both 1940 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1941 * to the UNWEIGHTED method, but with added encoding time/computation. 1942 */ 1943 #ifdef PNG_FLOATING_POINT_SUPPORTED 1944 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1945 int heuristic_method, int num_weights, png_doublep filter_weights, 1946 png_doublep filter_costs)); 1947 #endif 1948 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1949 1950 /* Heuristic used for row filter selection. These defines should NOT be 1951 * changed. 1952 */ 1953 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1954 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1955 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1956 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1957 1958 /* Set the library compression level. Currently, valid values range from 1959 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1960 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1961 * shown that zlib compression levels 3-6 usually perform as well as level 9 1962 * for PNG images, and do considerably fewer caclulations. In the future, 1963 * these values may not correspond directly to the zlib compression levels. 1964 */ 1965 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1966 int level)); 1967 1968 extern PNG_EXPORT(void,png_set_compression_mem_level) 1969 PNGARG((png_structp png_ptr, int mem_level)); 1970 1971 extern PNG_EXPORT(void,png_set_compression_strategy) 1972 PNGARG((png_structp png_ptr, int strategy)); 1973 1974 extern PNG_EXPORT(void,png_set_compression_window_bits) 1975 PNGARG((png_structp png_ptr, int window_bits)); 1976 1977 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1978 int method)); 1979 1980 /* These next functions are called for input/output, memory, and error 1981 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1982 * and call standard C I/O routines such as fread(), fwrite(), and 1983 * fprintf(). These functions can be made to use other I/O routines 1984 * at run time for those applications that need to handle I/O in a 1985 * different manner by calling png_set_???_fn(). See libpng.txt for 1986 * more information. 1987 */ 1988 1989 #if !defined(PNG_NO_STDIO) 1990 /* Initialize the input/output for the PNG file to the default functions. */ 1991 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1992 #endif 1993 1994 /* Replace the (error and abort), and warning functions with user 1995 * supplied functions. If no messages are to be printed you must still 1996 * write and use replacement functions. The replacement error_fn should 1997 * still do a longjmp to the last setjmp location if you are using this 1998 * method of error handling. If error_fn or warning_fn is NULL, the 1999 * default function will be used. 2000 */ 2001 2002 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2003 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2004 2005 /* Return the user pointer associated with the error functions */ 2006 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2007 2008 /* Replace the default data output functions with a user supplied one(s). 2009 * If buffered output is not used, then output_flush_fn can be set to NULL. 2010 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2011 * output_flush_fn will be ignored (and thus can be NULL). 2012 * It is probably a mistake to use NULL for output_flush_fn if 2013 * write_data_fn is not also NULL unless you have built libpng with 2014 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2015 * default flush function, which uses the standard *FILE structure, will 2016 * be used. 2017 */ 2018 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2019 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2020 2021 /* Replace the default data input function with a user supplied one. */ 2022 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2023 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2024 2025 /* Return the user pointer associated with the I/O functions */ 2026 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2027 2028 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2029 png_read_status_ptr read_row_fn)); 2030 2031 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2032 png_write_status_ptr write_row_fn)); 2033 2034 #ifdef PNG_USER_MEM_SUPPORTED 2035 /* Replace the default memory allocation functions with user supplied one(s). */ 2036 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2037 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2038 /* Return the user pointer associated with the memory functions */ 2039 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2040 #endif 2041 2042 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2043 defined(PNG_LEGACY_SUPPORTED) 2044 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2045 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2046 #endif 2047 2048 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2049 defined(PNG_LEGACY_SUPPORTED) 2050 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2051 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2052 #endif 2053 2054 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2055 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2056 defined(PNG_LEGACY_SUPPORTED) 2057 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2058 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2059 int user_transform_channels)); 2060 /* Return the user pointer associated with the user transform functions */ 2061 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2062 PNGARG((png_structp png_ptr)); 2063 #endif 2064 2065 #ifdef PNG_USER_CHUNKS_SUPPORTED 2066 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2067 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2068 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2069 png_ptr)); 2070 #endif 2071 2072 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2073 /* Sets the function callbacks for the push reader, and a pointer to a 2074 * user-defined structure available to the callback functions. 2075 */ 2076 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2077 png_voidp progressive_ptr, 2078 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2079 png_progressive_end_ptr end_fn)); 2080 2081 /* Returns the user pointer associated with the push read functions */ 2082 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2083 PNGARG((png_structp png_ptr)); 2084 2085 /* Function to be called when data becomes available */ 2086 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2087 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2088 2089 /* function that combines rows. Not very much different than the 2090 * png_combine_row() call. Is this even used????? 2091 */ 2092 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2093 png_bytep old_row, png_bytep new_row)); 2094 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2095 2096 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2097 png_uint_32 size)); 2098 2099 #if defined(PNG_1_0_X) 2100 # define png_malloc_warn png_malloc 2101 #else 2102 /* Added at libpng version 1.2.4 */ 2103 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2104 png_uint_32 size)); 2105 #endif 2106 2107 /* Frees a pointer allocated by png_malloc() */ 2108 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2109 2110 #if defined(PNG_1_0_X) 2111 /* Function to allocate memory for zlib. */ 2112 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2113 uInt size)); 2114 2115 /* Function to free memory for zlib */ 2116 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2117 #endif 2118 2119 /* Free data that was allocated internally */ 2120 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2121 png_infop info_ptr, png_uint_32 free_me, int num)); 2122 #ifdef PNG_FREE_ME_SUPPORTED 2123 /* Reassign responsibility for freeing existing data, whether allocated 2124 * by libpng or by the application 2125 */ 2126 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2127 png_infop info_ptr, int freer, png_uint_32 mask)); 2128 #endif 2129 /* Assignments for png_data_freer */ 2130 #define PNG_DESTROY_WILL_FREE_DATA 1 2131 #define PNG_SET_WILL_FREE_DATA 1 2132 #define PNG_USER_WILL_FREE_DATA 2 2133 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2134 #define PNG_FREE_HIST 0x0008 2135 #define PNG_FREE_ICCP 0x0010 2136 #define PNG_FREE_SPLT 0x0020 2137 #define PNG_FREE_ROWS 0x0040 2138 #define PNG_FREE_PCAL 0x0080 2139 #define PNG_FREE_SCAL 0x0100 2140 #define PNG_FREE_UNKN 0x0200 2141 #define PNG_FREE_LIST 0x0400 2142 #define PNG_FREE_PLTE 0x1000 2143 #define PNG_FREE_TRNS 0x2000 2144 #define PNG_FREE_TEXT 0x4000 2145 #define PNG_FREE_ALL 0x7fff 2146 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2147 2148 #ifdef PNG_USER_MEM_SUPPORTED 2149 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2150 png_uint_32 size)); 2151 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2152 png_voidp ptr)); 2153 #endif 2154 2155 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2156 png_voidp s1, png_voidp s2, png_uint_32 size)); 2157 2158 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2159 png_voidp s1, int value, png_uint_32 size)); 2160 2161 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2162 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2163 int check)); 2164 #endif /* USE_FAR_KEYWORD */ 2165 2166 #ifndef PNG_NO_ERROR_TEXT 2167 /* Fatal error in PNG image of libpng - can't continue */ 2168 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2169 png_const_charp error_message)); 2170 2171 /* The same, but the chunk name is prepended to the error string. */ 2172 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2173 png_const_charp error_message)); 2174 #else 2175 /* Fatal error in PNG image of libpng - can't continue */ 2176 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); 2177 #endif 2178 2179 #ifndef PNG_NO_WARNINGS 2180 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2181 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2182 png_const_charp warning_message)); 2183 2184 #ifdef PNG_READ_SUPPORTED 2185 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2186 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2187 png_const_charp warning_message)); 2188 #endif /* PNG_READ_SUPPORTED */ 2189 #endif /* PNG_NO_WARNINGS */ 2190 2191 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2192 * Similarly, the png_get_<chunk> calls are used to read values from the 2193 * png_info_struct, either storing the parameters in the passed variables, or 2194 * setting pointers into the png_info_struct where the data is stored. The 2195 * png_get_<chunk> functions return a non-zero value if the data was available 2196 * in info_ptr, or return zero and do not change any of the parameters if the 2197 * data was not available. 2198 * 2199 * These functions should be used instead of directly accessing png_info 2200 * to avoid problems with future changes in the size and internal layout of 2201 * png_info_struct. 2202 */ 2203 /* Returns "flag" if chunk data is valid in info_ptr. */ 2204 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2205 png_infop info_ptr, png_uint_32 flag)); 2206 2207 /* Returns number of bytes needed to hold a transformed row. */ 2208 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2209 png_infop info_ptr)); 2210 2211 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2212 /* Returns row_pointers, which is an array of pointers to scanlines that was 2213 * returned from png_read_png(). 2214 */ 2215 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2216 png_infop info_ptr)); 2217 /* Set row_pointers, which is an array of pointers to scanlines for use 2218 * by png_write_png(). 2219 */ 2220 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2221 png_infop info_ptr, png_bytepp row_pointers)); 2222 #endif 2223 2224 /* Returns number of color channels in image. */ 2225 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2226 png_infop info_ptr)); 2227 2228 #ifdef PNG_EASY_ACCESS_SUPPORTED 2229 /* Returns image width in pixels. */ 2230 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2231 png_ptr, png_infop info_ptr)); 2232 2233 /* Returns image height in pixels. */ 2234 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2235 png_ptr, png_infop info_ptr)); 2236 2237 /* Returns image bit_depth. */ 2238 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2239 png_ptr, png_infop info_ptr)); 2240 2241 /* Returns image color_type. */ 2242 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2243 png_ptr, png_infop info_ptr)); 2244 2245 /* Returns image filter_type. */ 2246 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2247 png_ptr, png_infop info_ptr)); 2248 2249 /* Returns image interlace_type. */ 2250 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2251 png_ptr, png_infop info_ptr)); 2252 2253 /* Returns image compression_type. */ 2254 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2255 png_ptr, png_infop info_ptr)); 2256 2257 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2258 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2259 png_ptr, png_infop info_ptr)); 2260 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2261 png_ptr, png_infop info_ptr)); 2262 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2263 png_ptr, png_infop info_ptr)); 2264 2265 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2266 #ifdef PNG_FLOATING_POINT_SUPPORTED 2267 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2268 png_ptr, png_infop info_ptr)); 2269 #endif 2270 2271 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2272 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2273 png_ptr, png_infop info_ptr)); 2274 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2275 png_ptr, png_infop info_ptr)); 2276 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2277 png_ptr, png_infop info_ptr)); 2278 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2279 png_ptr, png_infop info_ptr)); 2280 2281 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2282 2283 /* Returns pointer to signature string read from PNG header */ 2284 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2285 png_infop info_ptr)); 2286 2287 #if defined(PNG_bKGD_SUPPORTED) 2288 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2289 png_infop info_ptr, png_color_16p *background)); 2290 #endif 2291 2292 #if defined(PNG_bKGD_SUPPORTED) 2293 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2294 png_infop info_ptr, png_color_16p background)); 2295 #endif 2296 2297 #if defined(PNG_cHRM_SUPPORTED) 2298 #ifdef PNG_FLOATING_POINT_SUPPORTED 2299 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2300 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2301 double *red_y, double *green_x, double *green_y, double *blue_x, 2302 double *blue_y)); 2303 #endif 2304 #ifdef PNG_FIXED_POINT_SUPPORTED 2305 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2306 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2307 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2308 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2309 *int_blue_x, png_fixed_point *int_blue_y)); 2310 #endif 2311 #endif 2312 2313 #if defined(PNG_cHRM_SUPPORTED) 2314 #ifdef PNG_FLOATING_POINT_SUPPORTED 2315 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2316 png_infop info_ptr, double white_x, double white_y, double red_x, 2317 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2318 #endif 2319 #ifdef PNG_FIXED_POINT_SUPPORTED 2320 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2321 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2322 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2323 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2324 png_fixed_point int_blue_y)); 2325 #endif 2326 #endif 2327 2328 #if defined(PNG_gAMA_SUPPORTED) 2329 #ifdef PNG_FLOATING_POINT_SUPPORTED 2330 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2331 png_infop info_ptr, double *file_gamma)); 2332 #endif 2333 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2334 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2335 #endif 2336 2337 #if defined(PNG_gAMA_SUPPORTED) 2338 #ifdef PNG_FLOATING_POINT_SUPPORTED 2339 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2340 png_infop info_ptr, double file_gamma)); 2341 #endif 2342 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2343 png_infop info_ptr, png_fixed_point int_file_gamma)); 2344 #endif 2345 2346 #if defined(PNG_hIST_SUPPORTED) 2347 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2348 png_infop info_ptr, png_uint_16p *hist)); 2349 #endif 2350 2351 #if defined(PNG_hIST_SUPPORTED) 2352 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2353 png_infop info_ptr, png_uint_16p hist)); 2354 #endif 2355 2356 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2357 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2358 int *bit_depth, int *color_type, int *interlace_method, 2359 int *compression_method, int *filter_method)); 2360 2361 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2362 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2363 int color_type, int interlace_method, int compression_method, 2364 int filter_method)); 2365 2366 #if defined(PNG_oFFs_SUPPORTED) 2367 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2368 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2369 int *unit_type)); 2370 #endif 2371 2372 #if defined(PNG_oFFs_SUPPORTED) 2373 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2374 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2375 int unit_type)); 2376 #endif 2377 2378 #if defined(PNG_pCAL_SUPPORTED) 2379 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2380 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2381 int *type, int *nparams, png_charp *units, png_charpp *params)); 2382 #endif 2383 2384 #if defined(PNG_pCAL_SUPPORTED) 2385 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2386 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2387 int type, int nparams, png_charp units, png_charpp params)); 2388 #endif 2389 2390 #if defined(PNG_pHYs_SUPPORTED) 2391 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2392 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2393 #endif 2394 2395 #if defined(PNG_pHYs_SUPPORTED) 2396 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2397 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2398 #endif 2399 2400 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2401 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2402 2403 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2404 png_infop info_ptr, png_colorp palette, int num_palette)); 2405 2406 #if defined(PNG_sBIT_SUPPORTED) 2407 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2408 png_infop info_ptr, png_color_8p *sig_bit)); 2409 #endif 2410 2411 #if defined(PNG_sBIT_SUPPORTED) 2412 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2413 png_infop info_ptr, png_color_8p sig_bit)); 2414 #endif 2415 2416 #if defined(PNG_sRGB_SUPPORTED) 2417 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2418 png_infop info_ptr, int *intent)); 2419 #endif 2420 2421 #if defined(PNG_sRGB_SUPPORTED) 2422 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2423 png_infop info_ptr, int intent)); 2424 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2425 png_infop info_ptr, int intent)); 2426 #endif 2427 2428 #if defined(PNG_iCCP_SUPPORTED) 2429 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2430 png_infop info_ptr, png_charpp name, int *compression_type, 2431 png_charpp profile, png_uint_32 *proflen)); 2432 /* Note to maintainer: profile should be png_bytepp */ 2433 #endif 2434 2435 #if defined(PNG_iCCP_SUPPORTED) 2436 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2437 png_infop info_ptr, png_charp name, int compression_type, 2438 png_charp profile, png_uint_32 proflen)); 2439 /* Note to maintainer: profile should be png_bytep */ 2440 #endif 2441 2442 #if defined(PNG_sPLT_SUPPORTED) 2443 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2444 png_infop info_ptr, png_sPLT_tpp entries)); 2445 #endif 2446 2447 #if defined(PNG_sPLT_SUPPORTED) 2448 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2449 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2450 #endif 2451 2452 #if defined(PNG_TEXT_SUPPORTED) 2453 /* png_get_text also returns the number of text chunks in *num_text */ 2454 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2455 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2456 #endif 2457 2458 /* 2459 * Note while png_set_text() will accept a structure whose text, 2460 * language, and translated keywords are NULL pointers, the structure 2461 * returned by png_get_text will always contain regular 2462 * zero-terminated C strings. They might be empty strings but 2463 * they will never be NULL pointers. 2464 */ 2465 2466 #if defined(PNG_TEXT_SUPPORTED) 2467 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2468 png_infop info_ptr, png_textp text_ptr, int num_text)); 2469 #endif 2470 2471 #if defined(PNG_tIME_SUPPORTED) 2472 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2473 png_infop info_ptr, png_timep *mod_time)); 2474 #endif 2475 2476 #if defined(PNG_tIME_SUPPORTED) 2477 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2478 png_infop info_ptr, png_timep mod_time)); 2479 #endif 2480 2481 #if defined(PNG_tRNS_SUPPORTED) 2482 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2483 png_infop info_ptr, png_bytep *trans, int *num_trans, 2484 png_color_16p *trans_values)); 2485 #endif 2486 2487 #if defined(PNG_tRNS_SUPPORTED) 2488 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2489 png_infop info_ptr, png_bytep trans, int num_trans, 2490 png_color_16p trans_values)); 2491 #endif 2492 2493 #if defined(PNG_tRNS_SUPPORTED) 2494 #endif 2495 2496 #if defined(PNG_sCAL_SUPPORTED) 2497 #ifdef PNG_FLOATING_POINT_SUPPORTED 2498 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2499 png_infop info_ptr, int *unit, double *width, double *height)); 2500 #else 2501 #ifdef PNG_FIXED_POINT_SUPPORTED 2502 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2503 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2504 #endif 2505 #endif 2506 #endif /* PNG_sCAL_SUPPORTED */ 2507 2508 #if defined(PNG_sCAL_SUPPORTED) 2509 #ifdef PNG_FLOATING_POINT_SUPPORTED 2510 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2511 png_infop info_ptr, int unit, double width, double height)); 2512 #else 2513 #ifdef PNG_FIXED_POINT_SUPPORTED 2514 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2515 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2516 #endif 2517 #endif 2518 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2519 2520 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2521 /* Provide a list of chunks and how they are to be handled, if the built-in 2522 handling or default unknown chunk handling is not desired. Any chunks not 2523 listed will be handled in the default manner. The IHDR and IEND chunks 2524 must not be listed. 2525 keep = 0: follow default behaviour 2526 = 1: do not keep 2527 = 2: keep only if safe-to-copy 2528 = 3: keep even if unsafe-to-copy 2529 */ 2530 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2531 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2532 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2533 chunk_name)); 2534 #endif 2535 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2536 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2537 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2538 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2539 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2540 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2541 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2542 #endif 2543 2544 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2545 * If you need to turn it off for a chunk that your application has freed, 2546 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2547 */ 2548 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2549 png_infop info_ptr, int mask)); 2550 2551 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2552 /* The "params" pointer is currently not used and is for future expansion. */ 2553 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2554 png_infop info_ptr, 2555 int transforms, 2556 png_voidp params)); 2557 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2558 png_infop info_ptr, 2559 int transforms, 2560 png_voidp params)); 2561 #endif 2562 2563 /* Define PNG_DEBUG at compile time for debugging information. Higher 2564 * numbers for PNG_DEBUG mean more debugging information. This has 2565 * only been added since version 0.95 so it is not implemented throughout 2566 * libpng yet, but more support will be added as needed. 2567 */ 2568 #ifdef PNG_DEBUG 2569 #if (PNG_DEBUG > 0) 2570 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2571 #include <crtdbg.h> 2572 #if (PNG_DEBUG > 1) 2573 #ifndef _DEBUG 2574 # define _DEBUG 2575 #endif 2576 #ifndef png_debug 2577 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2578 #endif 2579 #ifndef png_debug1 2580 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2581 #endif 2582 #ifndef png_debug2 2583 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2584 #endif 2585 #endif 2586 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2587 #ifndef PNG_DEBUG_FILE 2588 #define PNG_DEBUG_FILE stderr 2589 #endif /* PNG_DEBUG_FILE */ 2590 2591 #if (PNG_DEBUG > 1) 2592 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2593 * compilers. 2594 */ 2595 # ifdef __STDC__ 2596 # ifndef png_debug 2597 # define png_debug(l,m) \ 2598 { \ 2599 int num_tabs=l; \ 2600 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2601 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2602 } 2603 # endif 2604 # ifndef png_debug1 2605 # define png_debug1(l,m,p1) \ 2606 { \ 2607 int num_tabs=l; \ 2608 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2609 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2610 } 2611 # endif 2612 # ifndef png_debug2 2613 # define png_debug2(l,m,p1,p2) \ 2614 { \ 2615 int num_tabs=l; \ 2616 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2617 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2618 } 2619 # endif 2620 # else /* __STDC __ */ 2621 # ifndef png_debug 2622 # define png_debug(l,m) \ 2623 { \ 2624 int num_tabs=l; \ 2625 char format[256]; \ 2626 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2627 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2628 m,PNG_STRING_NEWLINE); \ 2629 fprintf(PNG_DEBUG_FILE,format); \ 2630 } 2631 # endif 2632 # ifndef png_debug1 2633 # define png_debug1(l,m,p1) \ 2634 { \ 2635 int num_tabs=l; \ 2636 char format[256]; \ 2637 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2638 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2639 m,PNG_STRING_NEWLINE); \ 2640 fprintf(PNG_DEBUG_FILE,format,p1); \ 2641 } 2642 # endif 2643 # ifndef png_debug2 2644 # define png_debug2(l,m,p1,p2) \ 2645 { \ 2646 int num_tabs=l; \ 2647 char format[256]; \ 2648 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2649 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2650 m,PNG_STRING_NEWLINE); \ 2651 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2652 } 2653 # endif 2654 # endif /* __STDC __ */ 2655 #endif /* (PNG_DEBUG > 1) */ 2656 2657 #endif /* _MSC_VER */ 2658 #endif /* (PNG_DEBUG > 0) */ 2659 #endif /* PNG_DEBUG */ 2660 #ifndef png_debug 2661 #define png_debug(l, m) 2662 #endif 2663 #ifndef png_debug1 2664 #define png_debug1(l, m, p1) 2665 #endif 2666 #ifndef png_debug2 2667 #define png_debug2(l, m, p1, p2) 2668 #endif 2669 2670 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2671 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2672 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2673 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2674 2675 #ifdef PNG_MNG_FEATURES_SUPPORTED 2676 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2677 png_ptr, png_uint_32 mng_features_permitted)); 2678 #endif 2679 2680 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2681 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2682 #define PNG_HANDLE_CHUNK_NEVER 1 2683 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2684 #define PNG_HANDLE_CHUNK_ALWAYS 3 2685 2686 /* Added to version 1.2.0 */ 2687 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2688 #if defined(PNG_MMX_CODE_SUPPORTED) 2689 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2690 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2691 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2692 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2693 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2694 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2695 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2696 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2697 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2698 2699 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2700 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2701 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2702 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2703 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2704 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2705 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2706 2707 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2708 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2709 | PNG_MMX_READ_FLAGS \ 2710 | PNG_MMX_WRITE_FLAGS ) 2711 2712 #define PNG_SELECT_READ 1 2713 #define PNG_SELECT_WRITE 2 2714 #endif /* PNG_MMX_CODE_SUPPORTED */ 2715 2716 #if !defined(PNG_1_0_X) 2717 /* pngget.c */ 2718 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2719 PNGARG((int flag_select, int *compilerID)); 2720 2721 /* pngget.c */ 2722 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2723 PNGARG((int flag_select)); 2724 2725 /* pngget.c */ 2726 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2727 PNGARG((png_structp png_ptr)); 2728 2729 /* pngget.c */ 2730 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2731 PNGARG((png_structp png_ptr)); 2732 2733 /* pngget.c */ 2734 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2735 PNGARG((png_structp png_ptr)); 2736 2737 /* pngset.c */ 2738 extern PNG_EXPORT(void,png_set_asm_flags) 2739 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2740 2741 /* pngset.c */ 2742 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2743 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2744 png_uint_32 mmx_rowbytes_threshold)); 2745 2746 #endif /* PNG_1_0_X */ 2747 2748 #if !defined(PNG_1_0_X) 2749 /* png.c, pnggccrd.c, or pngvcrd.c */ 2750 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2751 #endif /* PNG_1_0_X */ 2752 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2753 2754 /* Strip the prepended error numbers ("#nnn ") from error and warning 2755 * messages before passing them to the error or warning handler. 2756 */ 2757 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2758 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2759 png_ptr, png_uint_32 strip_mode)); 2760 #endif 2761 2762 /* Added at libpng-1.2.6 */ 2763 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2764 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2765 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2766 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2767 png_ptr)); 2768 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2769 png_ptr)); 2770 #endif 2771 2772 2773 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2774 * project defs 2775 */ 2776 2777 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2778 /* With these routines we avoid an integer divide, which will be slower on 2779 * most machines. However, it does take more operations than the corresponding 2780 * divide method, so it may be slower on a few RISC systems. There are two 2781 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2782 * 2783 * Note that the rounding factors are NOT supposed to be the same! 128 and 2784 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2785 * standard method. 2786 * 2787 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2788 */ 2789 2790 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2791 2792 # define png_composite(composite, fg, alpha, bg) \ 2793 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2794 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2795 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2796 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2797 2798 # define png_composite_16(composite, fg, alpha, bg) \ 2799 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2800 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2801 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2802 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2803 2804 #else /* Standard method using integer division */ 2805 2806 # define png_composite(composite, fg, alpha, bg) \ 2807 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2808 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2809 (png_uint_16)127) / 255) 2810 2811 # define png_composite_16(composite, fg, alpha, bg) \ 2812 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2813 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2814 (png_uint_32)32767) / (png_uint_32)65535L) 2815 2816 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2817 2818 /* Inline macros to do direct reads of bytes from the input buffer. These 2819 * require that you are using an architecture that uses PNG byte ordering 2820 * (MSB first) and supports unaligned data storage. I think that PowerPC 2821 * in big-endian mode and 680x0 are the only ones that will support this. 2822 * The x86 line of processors definitely do not. The png_get_int_32() 2823 * routine also assumes we are using two's complement format for negative 2824 * values, which is almost certainly true. 2825 */ 2826 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2827 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2828 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2829 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2830 #else 2831 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2832 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2833 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2834 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2835 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2836 PNGARG((png_structp png_ptr, png_bytep buf)); 2837 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2838 2839 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2840 */ 2841 extern PNG_EXPORT(void,png_save_uint_32) 2842 PNGARG((png_bytep buf, png_uint_32 i)); 2843 extern PNG_EXPORT(void,png_save_int_32) 2844 PNGARG((png_bytep buf, png_int_32 i)); 2845 2846 /* Place a 16-bit number into a buffer in PNG byte order. 2847 * The parameter is declared unsigned int, not png_uint_16, 2848 * just to avoid potential problems on pre-ANSI C compilers. 2849 */ 2850 extern PNG_EXPORT(void,png_save_uint_16) 2851 PNGARG((png_bytep buf, unsigned int i)); 2852 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2853 2854 /* ************************************************************************* */ 2855 2856 /* These next functions are used internally in the code. They generally 2857 * shouldn't be used unless you are writing code to add or replace some 2858 * functionality in libpng. More information about most functions can 2859 * be found in the files where the functions are located. 2860 */ 2861 2862 2863 /* Various modes of operation, that are visible to applications because 2864 * they are used for unknown chunk location. 2865 */ 2866 #define PNG_HAVE_IHDR 0x01 2867 #define PNG_HAVE_PLTE 0x02 2868 #define PNG_HAVE_IDAT 0x04 2869 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2870 #define PNG_HAVE_IEND 0x10 2871 2872 #if defined(PNG_INTERNAL) 2873 2874 /* More modes of operation. Note that after an init, mode is set to 2875 * zero automatically when the structure is created. 2876 */ 2877 #define PNG_HAVE_gAMA 0x20 2878 #define PNG_HAVE_cHRM 0x40 2879 #define PNG_HAVE_sRGB 0x80 2880 #define PNG_HAVE_CHUNK_HEADER 0x100 2881 #define PNG_WROTE_tIME 0x200 2882 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2883 #define PNG_BACKGROUND_IS_GRAY 0x800 2884 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2885 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2886 2887 /* Flags for the transformations the PNG library does on the image data */ 2888 #define PNG_BGR 0x0001 2889 #define PNG_INTERLACE 0x0002 2890 #define PNG_PACK 0x0004 2891 #define PNG_SHIFT 0x0008 2892 #define PNG_SWAP_BYTES 0x0010 2893 #define PNG_INVERT_MONO 0x0020 2894 #define PNG_DITHER 0x0040 2895 #define PNG_BACKGROUND 0x0080 2896 #define PNG_BACKGROUND_EXPAND 0x0100 2897 /* 0x0200 unused */ 2898 #define PNG_16_TO_8 0x0400 2899 #define PNG_RGBA 0x0800 2900 #define PNG_EXPAND 0x1000 2901 #define PNG_GAMMA 0x2000 2902 #define PNG_GRAY_TO_RGB 0x4000 2903 #define PNG_FILLER 0x8000L 2904 #define PNG_PACKSWAP 0x10000L 2905 #define PNG_SWAP_ALPHA 0x20000L 2906 #define PNG_STRIP_ALPHA 0x40000L 2907 #define PNG_INVERT_ALPHA 0x80000L 2908 #define PNG_USER_TRANSFORM 0x100000L 2909 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2910 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2911 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2912 /* 0x800000L Unused */ 2913 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2914 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2915 /* 0x4000000L unused */ 2916 /* 0x8000000L unused */ 2917 /* 0x10000000L unused */ 2918 /* 0x20000000L unused */ 2919 /* 0x40000000L unused */ 2920 2921 /* Flags for png_create_struct */ 2922 #define PNG_STRUCT_PNG 0x0001 2923 #define PNG_STRUCT_INFO 0x0002 2924 2925 /* Scaling factor for filter heuristic weighting calculations */ 2926 #define PNG_WEIGHT_SHIFT 8 2927 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2928 #define PNG_COST_SHIFT 3 2929 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2930 2931 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2932 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2933 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2934 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2935 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2936 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2937 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2938 #define PNG_FLAG_ROW_INIT 0x0040 2939 #define PNG_FLAG_FILLER_AFTER 0x0080 2940 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2941 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2942 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2943 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2944 #define PNG_FLAG_FREE_PLTE 0x1000 2945 #define PNG_FLAG_FREE_TRNS 0x2000 2946 #define PNG_FLAG_FREE_HIST 0x4000 2947 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2948 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2949 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2950 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2951 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2952 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2953 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2954 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2955 /* 0x800000L unused */ 2956 /* 0x1000000L unused */ 2957 /* 0x2000000L unused */ 2958 /* 0x4000000L unused */ 2959 /* 0x8000000L unused */ 2960 /* 0x10000000L unused */ 2961 /* 0x20000000L unused */ 2962 /* 0x40000000L unused */ 2963 2964 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2965 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2966 2967 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2968 PNG_FLAG_CRC_CRITICAL_IGNORE) 2969 2970 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2971 PNG_FLAG_CRC_CRITICAL_MASK) 2972 2973 /* Save typing and make code easier to understand */ 2974 2975 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2976 abs((int)((c1).green) - (int)((c2).green)) + \ 2977 abs((int)((c1).blue) - (int)((c2).blue))) 2978 2979 /* Added to libpng-1.2.6 JB */ 2980 #define PNG_ROWBYTES(pixel_bits, width) \ 2981 ((pixel_bits) >= 8 ? \ 2982 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2983 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2984 2985 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2986 * ideal-delta..ideal+delta. Each argument is evaluated twice. 2987 * "ideal" and "delta" should be constants, normally simple 2988 * integers, "value" a variable. Added to libpng-1.2.6 JB 2989 */ 2990 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2991 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2992 2993 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2994 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2995 /* place to hold the signature string for a PNG file. */ 2996 #ifdef PNG_USE_GLOBAL_ARRAYS 2997 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 2998 #else 2999 #endif 3000 #endif /* PNG_NO_EXTERN */ 3001 3002 /* Constant strings for known chunk types. If you need to add a chunk, 3003 * define the name here, and add an invocation of the macro in png.c and 3004 * wherever it's needed. 3005 */ 3006 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3007 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3008 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3009 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3010 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3011 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3012 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3013 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3014 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3015 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3016 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3017 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3018 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3019 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3020 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3021 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3022 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3023 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3024 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3025 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3026 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3027 3028 #ifdef PNG_USE_GLOBAL_ARRAYS 3029 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3030 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3031 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3032 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3033 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3034 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3035 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3036 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3037 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3038 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3039 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3040 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3041 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3042 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3043 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3044 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3045 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3046 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3047 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3048 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3049 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3050 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3051 3052 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3053 /* Initialize png_ptr struct for reading, and allocate any other memory. 3054 * (old interface - DEPRECATED - use png_create_read_struct instead). 3055 */ 3056 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 3057 #undef png_read_init 3058 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3059 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3060 #endif 3061 3062 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3063 png_const_charp user_png_ver, png_size_t png_struct_size)); 3064 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3065 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3066 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3067 png_info_size)); 3068 #endif 3069 3070 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3071 /* Initialize png_ptr struct for writing, and allocate any other memory. 3072 * (old interface - DEPRECATED - use png_create_write_struct instead). 3073 */ 3074 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 3075 #undef png_write_init 3076 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3077 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3078 #endif 3079 3080 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3081 png_const_charp user_png_ver, png_size_t png_struct_size)); 3082 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3083 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3084 png_info_size)); 3085 3086 /* Allocate memory for an internal libpng struct */ 3087 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 3088 3089 /* Free memory from internal libpng struct */ 3090 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 3091 3092 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3093 malloc_fn, png_voidp mem_ptr)); 3094 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3095 png_free_ptr free_fn, png_voidp mem_ptr)); 3096 3097 /* Free any memory that info_ptr points to and reset struct. */ 3098 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3099 png_infop info_ptr)); 3100 3101 #ifndef PNG_1_0_X 3102 /* Function to allocate memory for zlib. */ 3103 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 3104 3105 /* Function to free memory for zlib */ 3106 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 3107 3108 #ifdef PNG_SIZE_T 3109 /* Function to convert a sizeof an item to png_sizeof item */ 3110 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 3111 #endif 3112 3113 /* Next four functions are used internally as callbacks. PNGAPI is required 3114 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3115 */ 3116 3117 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3118 png_bytep data, png_size_t length)); 3119 3120 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3121 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3122 png_bytep buffer, png_size_t length)); 3123 #endif 3124 3125 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3126 png_bytep data, png_size_t length)); 3127 3128 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3129 #if !defined(PNG_NO_STDIO) 3130 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 3131 #endif 3132 #endif 3133 #else /* PNG_1_0_X */ 3134 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3135 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3136 png_bytep buffer, png_size_t length)); 3137 #endif 3138 #endif /* PNG_1_0_X */ 3139 3140 /* Reset the CRC variable */ 3141 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 3142 3143 /* Write the "data" buffer to whatever output you are using. */ 3144 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3145 png_size_t length)); 3146 3147 /* Read data from whatever input you are using into the "data" buffer */ 3148 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3149 png_size_t length)); 3150 3151 /* Read bytes into buf, and update png_ptr->crc */ 3152 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3153 png_size_t length)); 3154 3155 /* Decompress data in a chunk that uses compression */ 3156 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3157 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3158 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3159 int comp_type, png_size_t chunklength, 3160 png_size_t prefix_length, png_size_t *data_length)); 3161 #endif 3162 3163 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3164 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 3165 3166 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3167 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 3168 3169 /* Calculate the CRC over a section of data. Note that we are only 3170 * passing a maximum of 64K on systems that have this as a memory limit, 3171 * since this is the maximum buffer size we can specify. 3172 */ 3173 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3174 png_size_t length)); 3175 3176 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3177 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 3178 #endif 3179 3180 /* Simple function to write the signature */ 3181 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 3182 3183 /* Write various chunks */ 3184 3185 /* Write the IHDR chunk, and update the png_struct with the necessary 3186 * information. 3187 */ 3188 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3189 png_uint_32 height, 3190 int bit_depth, int color_type, int compression_method, int filter_method, 3191 int interlace_method)); 3192 3193 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3194 png_uint_32 num_pal)); 3195 3196 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3197 png_size_t length)); 3198 3199 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 3200 3201 #if defined(PNG_WRITE_gAMA_SUPPORTED) 3202 #ifdef PNG_FLOATING_POINT_SUPPORTED 3203 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 3204 #endif 3205 #ifdef PNG_FIXED_POINT_SUPPORTED 3206 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 3207 file_gamma)); 3208 #endif 3209 #endif 3210 3211 #if defined(PNG_WRITE_sBIT_SUPPORTED) 3212 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3213 int color_type)); 3214 #endif 3215 3216 #if defined(PNG_WRITE_cHRM_SUPPORTED) 3217 #ifdef PNG_FLOATING_POINT_SUPPORTED 3218 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3219 double white_x, double white_y, 3220 double red_x, double red_y, double green_x, double green_y, 3221 double blue_x, double blue_y)); 3222 #endif 3223 #ifdef PNG_FIXED_POINT_SUPPORTED 3224 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3225 png_fixed_point int_white_x, png_fixed_point int_white_y, 3226 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3227 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3228 png_fixed_point int_blue_y)); 3229 #endif 3230 #endif 3231 3232 #if defined(PNG_WRITE_sRGB_SUPPORTED) 3233 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3234 int intent)); 3235 #endif 3236 3237 #if defined(PNG_WRITE_iCCP_SUPPORTED) 3238 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3239 png_charp name, int compression_type, 3240 png_charp profile, int proflen)); 3241 /* Note to maintainer: profile should be png_bytep */ 3242 #endif 3243 3244 #if defined(PNG_WRITE_sPLT_SUPPORTED) 3245 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3246 png_sPLT_tp palette)); 3247 #endif 3248 3249 #if defined(PNG_WRITE_tRNS_SUPPORTED) 3250 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3251 png_color_16p values, int number, int color_type)); 3252 #endif 3253 3254 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3255 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3256 png_color_16p values, int color_type)); 3257 #endif 3258 3259 #if defined(PNG_WRITE_hIST_SUPPORTED) 3260 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3261 int num_hist)); 3262 #endif 3263 3264 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3265 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3266 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3267 png_charp key, png_charpp new_key)); 3268 #endif 3269 3270 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3271 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3272 png_charp text, png_size_t text_len)); 3273 #endif 3274 3275 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3276 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3277 png_charp text, png_size_t text_len, int compression)); 3278 #endif 3279 3280 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3281 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3282 int compression, png_charp key, png_charp lang, png_charp lang_key, 3283 png_charp text)); 3284 #endif 3285 3286 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3287 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3288 png_infop info_ptr, png_textp text_ptr, int num_text)); 3289 #endif 3290 3291 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3292 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3293 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 3294 #endif 3295 3296 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3297 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3298 png_int_32 X0, png_int_32 X1, int type, int nparams, 3299 png_charp units, png_charpp params)); 3300 #endif 3301 3302 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3303 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3304 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3305 int unit_type)); 3306 #endif 3307 3308 #if defined(PNG_WRITE_tIME_SUPPORTED) 3309 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3310 png_timep mod_time)); 3311 #endif 3312 3313 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3314 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3315 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3316 int unit, double width, double height)); 3317 #else 3318 #ifdef PNG_FIXED_POINT_SUPPORTED 3319 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3320 int unit, png_charp width, png_charp height)); 3321 #endif 3322 #endif 3323 #endif 3324 3325 /* Called when finished processing a row of data */ 3326 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3327 3328 /* Internal use only. Called before first row of data */ 3329 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3330 3331 #if defined(PNG_READ_GAMMA_SUPPORTED) 3332 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3333 #endif 3334 3335 /* Combine a row of data, dealing with alpha, etc. if requested */ 3336 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3337 int mask)); 3338 3339 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3340 /* Expand an interlaced row */ 3341 /* OLD pre-1.0.9 interface: 3342 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3343 png_bytep row, int pass, png_uint_32 transformations)); 3344 */ 3345 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3346 #endif 3347 3348 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3349 3350 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3351 /* Grab pixels out of a row for an interlaced pass */ 3352 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3353 png_bytep row, int pass)); 3354 #endif 3355 3356 /* Unfilter a row */ 3357 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3358 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 3359 3360 /* Choose the best filter to use and filter the row data */ 3361 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3362 png_row_infop row_info)); 3363 3364 /* Write out the filtered row. */ 3365 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3366 png_bytep filtered_row)); 3367 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3368 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3369 3370 /* Initialize the row buffers, etc. */ 3371 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3372 /* Optional call to update the users info structure */ 3373 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3374 png_infop info_ptr)); 3375 3376 /* These are the functions that do the transformations */ 3377 #if defined(PNG_READ_FILLER_SUPPORTED) 3378 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3379 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3380 #endif 3381 3382 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3383 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3384 png_bytep row)); 3385 #endif 3386 3387 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3388 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3389 png_bytep row)); 3390 #endif 3391 3392 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3393 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3394 png_bytep row)); 3395 #endif 3396 3397 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3398 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3399 png_bytep row)); 3400 #endif 3401 3402 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3403 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3404 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3405 png_bytep row, png_uint_32 flags)); 3406 #endif 3407 3408 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3409 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3410 #endif 3411 3412 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3413 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3414 #endif 3415 3416 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3417 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3418 row_info, png_bytep row)); 3419 #endif 3420 3421 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3422 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3423 png_bytep row)); 3424 #endif 3425 3426 #if defined(PNG_READ_PACK_SUPPORTED) 3427 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3428 #endif 3429 3430 #if defined(PNG_READ_SHIFT_SUPPORTED) 3431 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3432 png_color_8p sig_bits)); 3433 #endif 3434 3435 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3436 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3437 #endif 3438 3439 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3440 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3441 #endif 3442 3443 #if defined(PNG_READ_DITHER_SUPPORTED) 3444 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3445 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3446 3447 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3448 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3449 png_colorp palette, int num_palette)); 3450 # endif 3451 #endif 3452 3453 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3454 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3455 #endif 3456 3457 #if defined(PNG_WRITE_PACK_SUPPORTED) 3458 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3459 png_bytep row, png_uint_32 bit_depth)); 3460 #endif 3461 3462 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3463 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3464 png_color_8p bit_depth)); 3465 #endif 3466 3467 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3468 #if defined(PNG_READ_GAMMA_SUPPORTED) 3469 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3470 png_color_16p trans_values, png_color_16p background, 3471 png_color_16p background_1, 3472 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3473 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3474 png_uint_16pp gamma_16_to_1, int gamma_shift)); 3475 #else 3476 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3477 png_color_16p trans_values, png_color_16p background)); 3478 #endif 3479 #endif 3480 3481 #if defined(PNG_READ_GAMMA_SUPPORTED) 3482 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3483 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3484 int gamma_shift)); 3485 #endif 3486 3487 #if defined(PNG_READ_EXPAND_SUPPORTED) 3488 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3489 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 3490 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3491 png_bytep row, png_color_16p trans_value)); 3492 #endif 3493 3494 /* The following decodes the appropriate chunks, and does error correction, 3495 * then calls the appropriate callback for the chunk if it is valid. 3496 */ 3497 3498 /* Decode the IHDR chunk */ 3499 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3500 png_uint_32 length)); 3501 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3502 png_uint_32 length)); 3503 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3504 png_uint_32 length)); 3505 3506 #if defined(PNG_READ_bKGD_SUPPORTED) 3507 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3508 png_uint_32 length)); 3509 #endif 3510 3511 #if defined(PNG_READ_cHRM_SUPPORTED) 3512 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3513 png_uint_32 length)); 3514 #endif 3515 3516 #if defined(PNG_READ_gAMA_SUPPORTED) 3517 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3518 png_uint_32 length)); 3519 #endif 3520 3521 #if defined(PNG_READ_hIST_SUPPORTED) 3522 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3523 png_uint_32 length)); 3524 #endif 3525 3526 #if defined(PNG_READ_iCCP_SUPPORTED) 3527 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3528 png_uint_32 length)); 3529 #endif /* PNG_READ_iCCP_SUPPORTED */ 3530 3531 #if defined(PNG_READ_iTXt_SUPPORTED) 3532 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3533 png_uint_32 length)); 3534 #endif 3535 3536 #if defined(PNG_READ_oFFs_SUPPORTED) 3537 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3538 png_uint_32 length)); 3539 #endif 3540 3541 #if defined(PNG_READ_pCAL_SUPPORTED) 3542 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3543 png_uint_32 length)); 3544 #endif 3545 3546 #if defined(PNG_READ_pHYs_SUPPORTED) 3547 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3548 png_uint_32 length)); 3549 #endif 3550 3551 #if defined(PNG_READ_sBIT_SUPPORTED) 3552 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3553 png_uint_32 length)); 3554 #endif 3555 3556 #if defined(PNG_READ_sCAL_SUPPORTED) 3557 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3558 png_uint_32 length)); 3559 #endif 3560 3561 #if defined(PNG_READ_sPLT_SUPPORTED) 3562 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3563 png_uint_32 length)); 3564 #endif /* PNG_READ_sPLT_SUPPORTED */ 3565 3566 #if defined(PNG_READ_sRGB_SUPPORTED) 3567 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3568 png_uint_32 length)); 3569 #endif 3570 3571 #if defined(PNG_READ_tEXt_SUPPORTED) 3572 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3573 png_uint_32 length)); 3574 #endif 3575 3576 #if defined(PNG_READ_tIME_SUPPORTED) 3577 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3578 png_uint_32 length)); 3579 #endif 3580 3581 #if defined(PNG_READ_tRNS_SUPPORTED) 3582 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3583 png_uint_32 length)); 3584 #endif 3585 3586 #if defined(PNG_READ_zTXt_SUPPORTED) 3587 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3588 png_uint_32 length)); 3589 #endif 3590 3591 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3592 png_infop info_ptr, png_uint_32 length)); 3593 3594 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3595 png_bytep chunk_name)); 3596 3597 /* Handle the transformations for reading and writing */ 3598 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3599 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3600 3601 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3602 3603 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3604 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3605 png_infop info_ptr)); 3606 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3607 png_infop info_ptr)); 3608 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3609 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3610 png_uint_32 length)); 3611 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3612 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3613 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3614 png_bytep buffer, png_size_t buffer_length)); 3615 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3616 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3617 png_bytep buffer, png_size_t buffer_length)); 3618 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3619 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3620 png_infop info_ptr, png_uint_32 length)); 3621 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3622 png_infop info_ptr)); 3623 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3624 png_infop info_ptr)); 3625 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3626 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3627 png_infop info_ptr)); 3628 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3629 png_infop info_ptr)); 3630 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3631 #if defined(PNG_READ_tEXt_SUPPORTED) 3632 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3633 png_infop info_ptr, png_uint_32 length)); 3634 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3635 png_infop info_ptr)); 3636 #endif 3637 #if defined(PNG_READ_zTXt_SUPPORTED) 3638 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3639 png_infop info_ptr, png_uint_32 length)); 3640 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3641 png_infop info_ptr)); 3642 #endif 3643 #if defined(PNG_READ_iTXt_SUPPORTED) 3644 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3645 png_infop info_ptr, png_uint_32 length)); 3646 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3647 png_infop info_ptr)); 3648 #endif 3649 3650 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3651 3652 #ifdef PNG_MNG_FEATURES_SUPPORTED 3653 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3654 png_bytep row)); 3655 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3656 png_bytep row)); 3657 #endif 3658 3659 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3660 #if defined(PNG_MMX_CODE_SUPPORTED) 3661 /* png.c */ /* PRIVATE */ 3662 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3663 #endif 3664 #endif 3665 3666 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3667 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3668 png_infop info_ptr)); 3669 3670 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3671 png_infop info_ptr)); 3672 3673 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3674 png_infop info_ptr)); 3675 3676 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3677 png_infop info_ptr)); 3678 3679 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3680 png_infop info_ptr)); 3681 3682 #if defined(PNG_pHYs_SUPPORTED) 3683 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3684 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3685 #endif /* PNG_pHYs_SUPPORTED */ 3686 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3687 3688 /* Read the chunk header (length + type name) */ 3689 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); 3690 3691 /* Added at libpng version 1.2.34 */ 3692 #if defined(PNG_cHRM_SUPPORTED) 3693 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3694 png_fixed_point int_white_x, png_fixed_point int_white_y, 3695 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3696 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3697 png_fixed_point int_blue_y)); 3698 #endif 3699 3700 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3701 3702 #endif /* PNG_INTERNAL */ 3703 3704 #ifdef __cplusplus 3705 } 3706 #endif 3707 3708 #endif /* PNG_VERSION_INFO_ONLY */ 3709 /* Do not put anything past this line */ 3710 #endif /* PNG_H */ 3711