1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.44 - June 26, 2010 4 * Copyright (c) 1998-2010 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 1.2.44 - June 26, 2010: 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 * 1.2.39beta01-05 13 10239 12.so.0.39[.0] 241 * 1.2.39rc01 13 10239 12.so.0.39[.0] 242 * 1.0.48 10 10048 10.so.0.48[.0] 243 * 1.2.39 13 10239 12.so.0.39[.0] 244 * 1.2.40beta01 13 10240 12.so.0.40[.0] 245 * 1.2.40rc01 13 10240 12.so.0.40[.0] 246 * 1.0.49 10 10049 10.so.0.49[.0] 247 * 1.2.40 13 10240 12.so.0.40[.0] 248 * 1.2.41beta01-18 13 10241 12.so.0.41[.0] 249 * 1.0.51rc01 10 10051 10.so.0.51[.0] 250 * 1.2.41rc01-03 13 10241 12.so.0.41[.0] 251 * 1.0.51 10 10051 10.so.0.51[.0] 252 * 1.2.41 13 10241 12.so.0.41[.0] 253 * 1.2.42beta01-02 13 10242 12.so.0.42[.0] 254 * 1.2.42rc01-05 13 10242 12.so.0.42[.0] 255 * 1.0.52 10 10052 10.so.0.52[.0] 256 * 1.2.42 13 10242 12.so.0.42[.0] 257 * 1.2.43beta01-05 13 10243 12.so.0.43[.0] 258 * 1.0.53rc01-02 10 10053 10.so.0.53[.0] 259 * 1.2.43rc01-02 13 10243 12.so.0.43[.0] 260 * 1.0.53 10 10053 10.so.0.53[.0] 261 * 1.2.43 13 10243 12.so.0.43[.0] 262 * 1.2.44beta01-03 13 10244 12.so.0.44[.0] 263 * 1.2.44rc01-03 13 10244 12.so.0.44[.0] 264 * 1.2.44 13 10244 12.so.0.44[.0] 265 * 266 * Henceforth the source version will match the shared-library major 267 * and minor numbers; the shared-library major version number will be 268 * used for changes in backward compatibility, as it is intended. The 269 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 270 * for applications, is an unsigned integer of the form xyyzz corresponding 271 * to the source version x.y.z (leading zeros in y and z). Beta versions 272 * were given the previous public release number plus a letter, until 273 * version 1.0.6j; from then on they were given the upcoming public 274 * release number plus "betaNN" or "rcNN". 275 * 276 * Binary incompatibility exists only when applications make direct access 277 * to the info_ptr or png_ptr members through png.h, and the compiled 278 * application is loaded with a different version of the library. 279 * 280 * DLLNUM will change each time there are forward or backward changes 281 * in binary compatibility (e.g., when a new feature is added). 282 * 283 * See libpng.txt or libpng.3 for more information. The PNG specification 284 * is available as a W3C Recommendation and as an ISO Specification, 285 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 286 */ 287 288 /* 289 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 290 * 291 * If you modify libpng you may insert additional notices immediately following 292 * this sentence. 293 * 294 * This code is released under the libpng license. 295 * 296 * libpng versions 1.2.6, August 15, 2004, through 1.2.44, June 26, 2010, are 297 * Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are 298 * distributed according to the same disclaimer and license as libpng-1.2.5 299 * with the following individual added to the list of Contributing Authors: 300 * 301 * Cosmin Truta 302 * 303 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 304 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 305 * distributed according to the same disclaimer and license as libpng-1.0.6 306 * with the following individuals added to the list of Contributing Authors: 307 * 308 * Simon-Pierre Cadieux 309 * Eric S. Raymond 310 * Gilles Vollant 311 * 312 * and with the following additions to the disclaimer: 313 * 314 * There is no warranty against interference with your enjoyment of the 315 * library or against infringement. There is no warranty that our 316 * efforts or the library will fulfill any of your particular purposes 317 * or needs. This library is provided with all faults, and the entire 318 * risk of satisfactory quality, performance, accuracy, and effort is with 319 * the user. 320 * 321 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 322 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 323 * distributed according to the same disclaimer and license as libpng-0.96, 324 * with the following individuals added to the list of Contributing Authors: 325 * 326 * Tom Lane 327 * Glenn Randers-Pehrson 328 * Willem van Schaik 329 * 330 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 331 * Copyright (c) 1996, 1997 Andreas Dilger 332 * Distributed according to the same disclaimer and license as libpng-0.88, 333 * with the following individuals added to the list of Contributing Authors: 334 * 335 * John Bowler 336 * Kevin Bracey 337 * Sam Bushell 338 * Magnus Holmgren 339 * Greg Roelofs 340 * Tom Tanner 341 * 342 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 343 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 344 * 345 * For the purposes of this copyright and license, "Contributing Authors" 346 * is defined as the following set of individuals: 347 * 348 * Andreas Dilger 349 * Dave Martindale 350 * Guy Eric Schalnat 351 * Paul Schmidt 352 * Tim Wegner 353 * 354 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 355 * and Group 42, Inc. disclaim all warranties, expressed or implied, 356 * including, without limitation, the warranties of merchantability and of 357 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 358 * assume no liability for direct, indirect, incidental, special, exemplary, 359 * or consequential damages, which may result from the use of the PNG 360 * Reference Library, even if advised of the possibility of such damage. 361 * 362 * Permission is hereby granted to use, copy, modify, and distribute this 363 * source code, or portions hereof, for any purpose, without fee, subject 364 * to the following restrictions: 365 * 366 * 1. The origin of this source code must not be misrepresented. 367 * 368 * 2. Altered versions must be plainly marked as such and 369 * must not be misrepresented as being the original source. 370 * 371 * 3. This Copyright notice may not be removed or altered from 372 * any source or altered source distribution. 373 * 374 * The Contributing Authors and Group 42, Inc. specifically permit, without 375 * fee, and encourage the use of this source code as a component to 376 * supporting the PNG file format in commercial products. If you use this 377 * source code in a product, acknowledgment is not required but would be 378 * appreciated. 379 */ 380 381 /* 382 * A "png_get_copyright" function is available, for convenient use in "about" 383 * boxes and the like: 384 * 385 * printf("%s",png_get_copyright(NULL)); 386 * 387 * Also, the PNG logo (in PNG format, of course) is supplied in the 388 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 389 */ 390 391 /* 392 * Libpng is OSI Certified Open Source Software. OSI Certified is a 393 * certification mark of the Open Source Initiative. 394 */ 395 396 /* 397 * The contributing authors would like to thank all those who helped 398 * with testing, bug fixes, and patience. This wouldn't have been 399 * possible without all of you. 400 * 401 * Thanks to Frank J. T. Wojcik for helping with the documentation. 402 */ 403 404 /* 405 * Y2K compliance in libpng: 406 * ========================= 407 * 408 * June 26, 2010 409 * 410 * Since the PNG Development group is an ad-hoc body, we can't make 411 * an official declaration. 412 * 413 * This is your unofficial assurance that libpng from version 0.71 and 414 * upward through 1.2.44 are Y2K compliant. It is my belief that earlier 415 * versions were also Y2K compliant. 416 * 417 * Libpng only has three year fields. One is a 2-byte unsigned integer 418 * that will hold years up to 65535. The other two hold the date in text 419 * format, and will hold years up to 9999. 420 * 421 * The integer is 422 * "png_uint_16 year" in png_time_struct. 423 * 424 * The strings are 425 * "png_charp time_buffer" in png_struct and 426 * "near_time_buffer", which is a local character string in png.c. 427 * 428 * There are seven time-related functions: 429 * png.c: png_convert_to_rfc_1123() in png.c 430 * (formerly png_convert_to_rfc_1152() in error) 431 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 432 * png_convert_from_time_t() in pngwrite.c 433 * png_get_tIME() in pngget.c 434 * png_handle_tIME() in pngrutil.c, called in pngread.c 435 * png_set_tIME() in pngset.c 436 * png_write_tIME() in pngwutil.c, called in pngwrite.c 437 * 438 * All handle dates properly in a Y2K environment. The 439 * png_convert_from_time_t() function calls gmtime() to convert from system 440 * clock time, which returns (year - 1900), which we properly convert to 441 * the full 4-digit year. There is a possibility that applications using 442 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 443 * function, or that they are incorrectly passing only a 2-digit year 444 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 445 * but this is not under our control. The libpng documentation has always 446 * stated that it works with 4-digit years, and the APIs have been 447 * documented as such. 448 * 449 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 450 * integer to hold the year, and can hold years as large as 65535. 451 * 452 * zlib, upon which libpng depends, is also Y2K compliant. It contains 453 * no date-related code. 454 * 455 * Glenn Randers-Pehrson 456 * libpng maintainer 457 * PNG Development Group 458 */ 459 460 #ifndef PNG_H 461 #define PNG_H 462 463 /* This is not the place to learn how to use libpng. The file libpng.txt 464 * describes how to use libpng, and the file example.c summarizes it 465 * with some code on which to build. This file is useful for looking 466 * at the actual function definitions and structure components. 467 */ 468 469 /* Version information for png.h - this should match the version in png.c */ 470 #define PNG_LIBPNG_VER_STRING "1.2.44" 471 #define PNG_HEADER_VERSION_STRING \ 472 " libpng version 1.2.44 - June 26, 2010\n" 473 474 #define PNG_LIBPNG_VER_SONUM 0 475 #define PNG_LIBPNG_VER_DLLNUM 13 476 477 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 478 #define PNG_LIBPNG_VER_MAJOR 1 479 #define PNG_LIBPNG_VER_MINOR 2 480 #define PNG_LIBPNG_VER_RELEASE 44 481 /* This should match the numeric part of the final component of 482 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 483 */ 484 485 #define PNG_LIBPNG_VER_BUILD 0 486 487 /* Release Status */ 488 #define PNG_LIBPNG_BUILD_ALPHA 1 489 #define PNG_LIBPNG_BUILD_BETA 2 490 #define PNG_LIBPNG_BUILD_RC 3 491 #define PNG_LIBPNG_BUILD_STABLE 4 492 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 493 494 /* Release-Specific Flags */ 495 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 496 PNG_LIBPNG_BUILD_STABLE only */ 497 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 498 PNG_LIBPNG_BUILD_SPECIAL */ 499 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 500 PNG_LIBPNG_BUILD_PRIVATE */ 501 502 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 503 504 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 505 * We must not include leading zeros. 506 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 507 * version 1.0.0 was mis-numbered 100 instead of 10000). From 508 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 509 */ 510 #define PNG_LIBPNG_VER 10244 /* 1.2.44 */ 511 512 #ifndef PNG_VERSION_INFO_ONLY 513 /* Include the compression library's header */ 514 #include "zlib.h" 515 #endif 516 517 /* Include all user configurable info, including optional assembler routines */ 518 #include "pngconf.h" 519 520 /* 521 * Added at libpng-1.2.8 */ 522 /* Ref MSDN: Private as priority over Special 523 * VS_FF_PRIVATEBUILD File *was not* built using standard release 524 * procedures. If this value is given, the StringFileInfo block must 525 * contain a PrivateBuild string. 526 * 527 * VS_FF_SPECIALBUILD File *was* built by the original company using 528 * standard release procedures but is a variation of the standard 529 * file of the same version number. If this value is given, the 530 * StringFileInfo block must contain a SpecialBuild string. 531 */ 532 533 #ifdef PNG_USER_PRIVATEBUILD 534 # define PNG_LIBPNG_BUILD_TYPE \ 535 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 536 #else 537 # ifdef PNG_LIBPNG_SPECIALBUILD 538 # define PNG_LIBPNG_BUILD_TYPE \ 539 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 540 # else 541 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 542 # endif 543 #endif 544 545 #ifndef PNG_VERSION_INFO_ONLY 546 547 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 548 #ifdef __cplusplus 549 extern "C" { 550 #endif /* __cplusplus */ 551 552 /* This file is arranged in several sections. The first section contains 553 * structure and type definitions. The second section contains the external 554 * library functions, while the third has the internal library functions, 555 * which applications aren't expected to use directly. 556 */ 557 558 #ifndef PNG_NO_TYPECAST_NULL 559 #define int_p_NULL (int *)NULL 560 #define png_bytep_NULL (png_bytep)NULL 561 #define png_bytepp_NULL (png_bytepp)NULL 562 #define png_doublep_NULL (png_doublep)NULL 563 #define png_error_ptr_NULL (png_error_ptr)NULL 564 #define png_flush_ptr_NULL (png_flush_ptr)NULL 565 #define png_free_ptr_NULL (png_free_ptr)NULL 566 #define png_infopp_NULL (png_infopp)NULL 567 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 568 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 569 #define png_rw_ptr_NULL (png_rw_ptr)NULL 570 #define png_structp_NULL (png_structp)NULL 571 #define png_uint_16p_NULL (png_uint_16p)NULL 572 #define png_voidp_NULL (png_voidp)NULL 573 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 574 #else 575 #define int_p_NULL NULL 576 #define png_bytep_NULL NULL 577 #define png_bytepp_NULL NULL 578 #define png_doublep_NULL NULL 579 #define png_error_ptr_NULL NULL 580 #define png_flush_ptr_NULL NULL 581 #define png_free_ptr_NULL NULL 582 #define png_infopp_NULL NULL 583 #define png_malloc_ptr_NULL NULL 584 #define png_read_status_ptr_NULL NULL 585 #define png_rw_ptr_NULL NULL 586 #define png_structp_NULL NULL 587 #define png_uint_16p_NULL NULL 588 #define png_voidp_NULL NULL 589 #define png_write_status_ptr_NULL NULL 590 #endif 591 592 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 593 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 594 /* Version information for C files, stored in png.c. This had better match 595 * the version above. 596 */ 597 #ifdef PNG_USE_GLOBAL_ARRAYS 598 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 599 /* Need room for 99.99.99beta99z */ 600 #else 601 #define png_libpng_ver png_get_header_ver(NULL) 602 #endif 603 604 #ifdef PNG_USE_GLOBAL_ARRAYS 605 /* This was removed in version 1.0.5c */ 606 /* Structures to facilitate easy interlacing. See png.c for more details */ 607 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 608 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 609 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 610 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 611 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 612 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 613 /* This isn't currently used. If you need it, see png.c for more details. 614 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 615 */ 616 #endif 617 618 #endif /* PNG_NO_EXTERN */ 619 620 /* Three color definitions. The order of the red, green, and blue, (and the 621 * exact size) is not important, although the size of the fields need to 622 * be png_byte or png_uint_16 (as defined below). 623 */ 624 typedef struct png_color_struct 625 { 626 png_byte red; 627 png_byte green; 628 png_byte blue; 629 } png_color; 630 typedef png_color FAR * png_colorp; 631 typedef png_color FAR * FAR * png_colorpp; 632 633 typedef struct png_color_16_struct 634 { 635 png_byte index; /* used for palette files */ 636 png_uint_16 red; /* for use in red green blue files */ 637 png_uint_16 green; 638 png_uint_16 blue; 639 png_uint_16 gray; /* for use in grayscale files */ 640 } png_color_16; 641 typedef png_color_16 FAR * png_color_16p; 642 typedef png_color_16 FAR * FAR * png_color_16pp; 643 644 typedef struct png_color_8_struct 645 { 646 png_byte red; /* for use in red green blue files */ 647 png_byte green; 648 png_byte blue; 649 png_byte gray; /* for use in grayscale files */ 650 png_byte alpha; /* for alpha channel files */ 651 } png_color_8; 652 typedef png_color_8 FAR * png_color_8p; 653 typedef png_color_8 FAR * FAR * png_color_8pp; 654 655 /* 656 * The following two structures are used for the in-core representation 657 * of sPLT chunks. 658 */ 659 typedef struct png_sPLT_entry_struct 660 { 661 png_uint_16 red; 662 png_uint_16 green; 663 png_uint_16 blue; 664 png_uint_16 alpha; 665 png_uint_16 frequency; 666 } png_sPLT_entry; 667 typedef png_sPLT_entry FAR * png_sPLT_entryp; 668 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 669 670 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 671 * occupy the LSB of their respective members, and the MSB of each member 672 * is zero-filled. The frequency member always occupies the full 16 bits. 673 */ 674 675 typedef struct png_sPLT_struct 676 { 677 png_charp name; /* palette name */ 678 png_byte depth; /* depth of palette samples */ 679 png_sPLT_entryp entries; /* palette entries */ 680 png_int_32 nentries; /* number of palette entries */ 681 } png_sPLT_t; 682 typedef png_sPLT_t FAR * png_sPLT_tp; 683 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 684 685 #ifdef PNG_TEXT_SUPPORTED 686 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 687 * and whether that contents is compressed or not. The "key" field 688 * points to a regular zero-terminated C string. The "text", "lang", and 689 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 690 * However, the * structure returned by png_get_text() will always contain 691 * regular zero-terminated C strings (possibly empty), never NULL pointers, 692 * so they can be safely used in printf() and other string-handling functions. 693 */ 694 typedef struct png_text_struct 695 { 696 int compression; /* compression value: 697 -1: tEXt, none 698 0: zTXt, deflate 699 1: iTXt, none 700 2: iTXt, deflate */ 701 png_charp key; /* keyword, 1-79 character description of "text" */ 702 png_charp text; /* comment, may be an empty string (ie "") 703 or a NULL pointer */ 704 png_size_t text_length; /* length of the text string */ 705 #ifdef PNG_iTXt_SUPPORTED 706 png_size_t itxt_length; /* length of the itxt string */ 707 png_charp lang; /* language code, 0-79 characters 708 or a NULL pointer */ 709 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 710 chars or a NULL pointer */ 711 #endif 712 } png_text; 713 typedef png_text FAR * png_textp; 714 typedef png_text FAR * FAR * png_textpp; 715 #endif 716 717 /* Supported compression types for text in PNG files (tEXt, and zTXt). 718 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 719 */ 720 #define PNG_TEXT_COMPRESSION_NONE_WR -3 721 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 722 #define PNG_TEXT_COMPRESSION_NONE -1 723 #define PNG_TEXT_COMPRESSION_zTXt 0 724 #define PNG_ITXT_COMPRESSION_NONE 1 725 #define PNG_ITXT_COMPRESSION_zTXt 2 726 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 727 728 /* png_time is a way to hold the time in an machine independent way. 729 * Two conversions are provided, both from time_t and struct tm. There 730 * is no portable way to convert to either of these structures, as far 731 * as I know. If you know of a portable way, send it to me. As a side 732 * note - PNG has always been Year 2000 compliant! 733 */ 734 typedef struct png_time_struct 735 { 736 png_uint_16 year; /* full year, as in, 1995 */ 737 png_byte month; /* month of year, 1 - 12 */ 738 png_byte day; /* day of month, 1 - 31 */ 739 png_byte hour; /* hour of day, 0 - 23 */ 740 png_byte minute; /* minute of hour, 0 - 59 */ 741 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 742 } png_time; 743 typedef png_time FAR * png_timep; 744 typedef png_time FAR * FAR * png_timepp; 745 746 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 747 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 748 /* png_unknown_chunk is a structure to hold queued chunks for which there is 749 * no specific support. The idea is that we can use this to queue 750 * up private chunks for output even though the library doesn't actually 751 * know about their semantics. 752 */ 753 #define PNG_CHUNK_NAME_LENGTH 5 754 typedef struct png_unknown_chunk_t 755 { 756 png_byte name[PNG_CHUNK_NAME_LENGTH]; 757 png_byte *data; 758 png_size_t size; 759 760 /* libpng-using applications should NOT directly modify this byte. */ 761 png_byte location; /* mode of operation at read time */ 762 } 763 png_unknown_chunk; 764 typedef png_unknown_chunk FAR * png_unknown_chunkp; 765 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 766 #endif 767 768 /* png_info is a structure that holds the information in a PNG file so 769 * that the application can find out the characteristics of the image. 770 * If you are reading the file, this structure will tell you what is 771 * in the PNG file. If you are writing the file, fill in the information 772 * you want to put into the PNG file, then call png_write_info(). 773 * The names chosen should be very close to the PNG specification, so 774 * consult that document for information about the meaning of each field. 775 * 776 * With libpng < 0.95, it was only possible to directly set and read the 777 * the values in the png_info_struct, which meant that the contents and 778 * order of the values had to remain fixed. With libpng 0.95 and later, 779 * however, there are now functions that abstract the contents of 780 * png_info_struct from the application, so this makes it easier to use 781 * libpng with dynamic libraries, and even makes it possible to use 782 * libraries that don't have all of the libpng ancillary chunk-handing 783 * functionality. 784 * 785 * In any case, the order of the parameters in png_info_struct should NOT 786 * be changed for as long as possible to keep compatibility with applications 787 * that use the old direct-access method with png_info_struct. 788 * 789 * The following members may have allocated storage attached that should be 790 * cleaned up before the structure is discarded: palette, trans, text, 791 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 792 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 793 * are automatically freed when the info structure is deallocated, if they were 794 * allocated internally by libpng. This behavior can be changed by means 795 * of the png_data_freer() function. 796 * 797 * More allocation details: all the chunk-reading functions that 798 * change these members go through the corresponding png_set_* 799 * functions. A function to clear these members is available: see 800 * png_free_data(). The png_set_* functions do not depend on being 801 * able to point info structure members to any of the storage they are 802 * passed (they make their own copies), EXCEPT that the png_set_text 803 * functions use the same storage passed to them in the text_ptr or 804 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 805 * functions do not make their own copies. 806 */ 807 typedef struct png_info_struct 808 { 809 /* The following are necessary for every PNG file */ 810 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 811 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 812 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 813 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 814 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 815 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 816 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 817 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 818 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 819 /* The following three should have been named *_method not *_type */ 820 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 821 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 822 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 823 824 /* The following is informational only on read, and not used on writes. */ 825 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 826 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 827 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 828 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 829 830 /* The rest of the data is optional. If you are reading, check the 831 * valid field to see if the information in these are valid. If you 832 * are writing, set the valid field to those chunks you want written, 833 * and initialize the appropriate fields below. 834 */ 835 836 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 837 /* The gAMA chunk describes the gamma characteristics of the system 838 * on which the image was created, normally in the range [1.0, 2.5]. 839 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 840 */ 841 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 842 #endif 843 844 #ifdef PNG_sRGB_SUPPORTED 845 /* GR-P, 0.96a */ 846 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 847 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 848 #endif 849 850 #ifdef PNG_TEXT_SUPPORTED 851 /* The tEXt, and zTXt chunks contain human-readable textual data in 852 * uncompressed, compressed, and optionally compressed forms, respectively. 853 * The data in "text" is an array of pointers to uncompressed, 854 * null-terminated C strings. Each chunk has a keyword that describes the 855 * textual data contained in that chunk. Keywords are not required to be 856 * unique, and the text string may be empty. Any number of text chunks may 857 * be in an image. 858 */ 859 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 860 int max_text PNG_DEPSTRUCT; /* current size of text array */ 861 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 862 #endif /* PNG_TEXT_SUPPORTED */ 863 864 #ifdef PNG_tIME_SUPPORTED 865 /* The tIME chunk holds the last time the displayed image data was 866 * modified. See the png_time struct for the contents of this struct. 867 */ 868 png_time mod_time PNG_DEPSTRUCT; 869 #endif 870 871 #ifdef PNG_sBIT_SUPPORTED 872 /* The sBIT chunk specifies the number of significant high-order bits 873 * in the pixel data. Values are in the range [1, bit_depth], and are 874 * only specified for the channels in the pixel data. The contents of 875 * the low-order bits is not specified. Data is valid if 876 * (valid & PNG_INFO_sBIT) is non-zero. 877 */ 878 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 879 #endif 880 881 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 882 defined(PNG_READ_BACKGROUND_SUPPORTED) 883 /* The tRNS chunk supplies transparency data for paletted images and 884 * other image types that don't need a full alpha channel. There are 885 * "num_trans" transparency values for a paletted image, stored in the 886 * same order as the palette colors, starting from index 0. Values 887 * for the data are in the range [0, 255], ranging from fully transparent 888 * to fully opaque, respectively. For non-paletted images, there is a 889 * single color specified that should be treated as fully transparent. 890 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 891 */ 892 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 893 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 894 #endif 895 896 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 897 /* The bKGD chunk gives the suggested image background color if the 898 * display program does not have its own background color and the image 899 * is needs to composited onto a background before display. The colors 900 * in "background" are normally in the same color space/depth as the 901 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 902 */ 903 png_color_16 background PNG_DEPSTRUCT; 904 #endif 905 906 #ifdef PNG_oFFs_SUPPORTED 907 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 908 * and downwards from the top-left corner of the display, page, or other 909 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 910 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 911 */ 912 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 913 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 914 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 915 #endif 916 917 #ifdef PNG_pHYs_SUPPORTED 918 /* The pHYs chunk gives the physical pixel density of the image for 919 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 920 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 921 */ 922 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 923 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 924 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 925 #endif 926 927 #ifdef PNG_hIST_SUPPORTED 928 /* The hIST chunk contains the relative frequency or importance of the 929 * various palette entries, so that a viewer can intelligently select a 930 * reduced-color palette, if required. Data is an array of "num_palette" 931 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 932 * is non-zero. 933 */ 934 png_uint_16p hist PNG_DEPSTRUCT; 935 #endif 936 937 #ifdef PNG_cHRM_SUPPORTED 938 /* The cHRM chunk describes the CIE color characteristics of the monitor 939 * on which the PNG was created. This data allows the viewer to do gamut 940 * mapping of the input image to ensure that the viewer sees the same 941 * colors in the image as the creator. Values are in the range 942 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 943 */ 944 #ifdef PNG_FLOATING_POINT_SUPPORTED 945 float x_white PNG_DEPSTRUCT; 946 float y_white PNG_DEPSTRUCT; 947 float x_red PNG_DEPSTRUCT; 948 float y_red PNG_DEPSTRUCT; 949 float x_green PNG_DEPSTRUCT; 950 float y_green PNG_DEPSTRUCT; 951 float x_blue PNG_DEPSTRUCT; 952 float y_blue PNG_DEPSTRUCT; 953 #endif 954 #endif 955 956 #ifdef PNG_pCAL_SUPPORTED 957 /* The pCAL chunk describes a transformation between the stored pixel 958 * values and original physical data values used to create the image. 959 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 960 * range given by [pcal_X0, pcal_X1], and are further transformed by a 961 * (possibly non-linear) transformation function given by "pcal_type" 962 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 963 * defines below, and the PNG-Group's PNG extensions document for a 964 * complete description of the transformations and how they should be 965 * implemented, and for a description of the ASCII parameter strings. 966 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 967 */ 968 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 969 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 970 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 971 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 972 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 973 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 974 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 975 #endif 976 977 /* New members added in libpng-1.0.6 */ 978 #ifdef PNG_FREE_ME_SUPPORTED 979 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 980 #endif 981 982 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 983 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 984 /* Storage for unknown chunks that the library doesn't recognize. */ 985 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 986 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 987 #endif 988 989 #ifdef PNG_iCCP_SUPPORTED 990 /* iCCP chunk data. */ 991 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 992 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 993 /* Note to maintainer: should be png_bytep */ 994 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 995 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 996 #endif 997 998 #ifdef PNG_sPLT_SUPPORTED 999 /* Data on sPLT chunks (there may be more than one). */ 1000 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1001 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1002 #endif 1003 1004 #ifdef PNG_sCAL_SUPPORTED 1005 /* The sCAL chunk describes the actual physical dimensions of the 1006 * subject matter of the graphic. The chunk contains a unit specification 1007 * a byte value, and two ASCII strings representing floating-point 1008 * values. The values are width and height corresponsing to one pixel 1009 * in the image. This external representation is converted to double 1010 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1011 */ 1012 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1013 #ifdef PNG_FLOATING_POINT_SUPPORTED 1014 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1015 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1016 #endif 1017 #ifdef PNG_FIXED_POINT_SUPPORTED 1018 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1019 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1020 #endif 1021 #endif 1022 1023 #ifdef PNG_INFO_IMAGE_SUPPORTED 1024 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1025 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1026 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1027 #endif 1028 1029 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1030 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1031 #endif 1032 1033 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1034 png_fixed_point int_x_white PNG_DEPSTRUCT; 1035 png_fixed_point int_y_white PNG_DEPSTRUCT; 1036 png_fixed_point int_x_red PNG_DEPSTRUCT; 1037 png_fixed_point int_y_red PNG_DEPSTRUCT; 1038 png_fixed_point int_x_green PNG_DEPSTRUCT; 1039 png_fixed_point int_y_green PNG_DEPSTRUCT; 1040 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1041 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1042 #endif 1043 1044 } png_info; 1045 1046 typedef png_info FAR * png_infop; 1047 typedef png_info FAR * FAR * png_infopp; 1048 1049 /* Maximum positive integer used in PNG is (2^31)-1 */ 1050 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1051 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1052 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1053 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1054 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1055 #define PNG_MAX_UINT PNG_UINT_31_MAX 1056 #endif 1057 1058 /* These describe the color_type field in png_info. */ 1059 /* color type masks */ 1060 #define PNG_COLOR_MASK_PALETTE 1 1061 #define PNG_COLOR_MASK_COLOR 2 1062 #define PNG_COLOR_MASK_ALPHA 4 1063 1064 /* color types. Note that not all combinations are legal */ 1065 #define PNG_COLOR_TYPE_GRAY 0 1066 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1067 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1068 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1069 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1070 /* aliases */ 1071 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1072 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1073 1074 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1075 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1076 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1077 1078 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1079 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1080 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1081 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1082 1083 /* These are for the interlacing type. These values should NOT be changed. */ 1084 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1085 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1086 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1087 1088 /* These are for the oFFs chunk. These values should NOT be changed. */ 1089 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1090 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1091 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1092 1093 /* These are for the pCAL chunk. These values should NOT be changed. */ 1094 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1095 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1096 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1097 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1098 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1099 1100 /* These are for the sCAL chunk. These values should NOT be changed. */ 1101 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1102 #define PNG_SCALE_METER 1 /* meters per pixel */ 1103 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1104 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1105 1106 /* These are for the pHYs chunk. These values should NOT be changed. */ 1107 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1108 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1109 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1110 1111 /* These are for the sRGB chunk. These values should NOT be changed. */ 1112 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1113 #define PNG_sRGB_INTENT_RELATIVE 1 1114 #define PNG_sRGB_INTENT_SATURATION 2 1115 #define PNG_sRGB_INTENT_ABSOLUTE 3 1116 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1117 1118 /* This is for text chunks */ 1119 #define PNG_KEYWORD_MAX_LENGTH 79 1120 1121 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1122 #define PNG_MAX_PALETTE_LENGTH 256 1123 1124 /* These determine if an ancillary chunk's data has been successfully read 1125 * from the PNG header, or if the application has filled in the corresponding 1126 * data in the info_struct to be written into the output file. The values 1127 * of the PNG_INFO_<chunk> defines should NOT be changed. 1128 */ 1129 #define PNG_INFO_gAMA 0x0001 1130 #define PNG_INFO_sBIT 0x0002 1131 #define PNG_INFO_cHRM 0x0004 1132 #define PNG_INFO_PLTE 0x0008 1133 #define PNG_INFO_tRNS 0x0010 1134 #define PNG_INFO_bKGD 0x0020 1135 #define PNG_INFO_hIST 0x0040 1136 #define PNG_INFO_pHYs 0x0080 1137 #define PNG_INFO_oFFs 0x0100 1138 #define PNG_INFO_tIME 0x0200 1139 #define PNG_INFO_pCAL 0x0400 1140 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1141 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1142 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1143 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1144 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1145 1146 /* This is used for the transformation routines, as some of them 1147 * change these values for the row. It also should enable using 1148 * the routines for other purposes. 1149 */ 1150 typedef struct png_row_info_struct 1151 { 1152 png_uint_32 width; /* width of row */ 1153 png_uint_32 rowbytes; /* number of bytes in row */ 1154 png_byte color_type; /* color type of row */ 1155 png_byte bit_depth; /* bit depth of row */ 1156 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1157 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1158 } png_row_info; 1159 1160 typedef png_row_info FAR * png_row_infop; 1161 typedef png_row_info FAR * FAR * png_row_infopp; 1162 1163 /* These are the function types for the I/O functions and for the functions 1164 * that allow the user to override the default I/O functions with his or her 1165 * own. The png_error_ptr type should match that of user-supplied warning 1166 * and error functions, while the png_rw_ptr type should match that of the 1167 * user read/write data functions. 1168 */ 1169 typedef struct png_struct_def png_struct; 1170 typedef png_struct FAR * png_structp; 1171 1172 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1173 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1174 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1175 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1176 int)); 1177 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1178 int)); 1179 1180 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1181 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1182 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1183 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1184 png_uint_32, int)); 1185 #endif 1186 1187 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1188 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1189 defined(PNG_LEGACY_SUPPORTED) 1190 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1191 png_row_infop, png_bytep)); 1192 #endif 1193 1194 #ifdef PNG_USER_CHUNKS_SUPPORTED 1195 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1196 #endif 1197 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1198 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1199 #endif 1200 1201 /* Transform masks for the high-level interface */ 1202 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1203 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1204 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1205 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1206 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1207 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1208 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1209 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1210 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1211 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1212 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1213 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1214 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1215 /* Added to libpng-1.2.34 */ 1216 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1217 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1218 /* Added to libpng-1.2.41 */ 1219 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1220 1221 /* Flags for MNG supported features */ 1222 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1223 #define PNG_FLAG_MNG_FILTER_64 0x04 1224 #define PNG_ALL_MNG_FEATURES 0x05 1225 1226 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1227 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1228 1229 /* The structure that holds the information to read and write PNG files. 1230 * The only people who need to care about what is inside of this are the 1231 * people who will be modifying the library for their own special needs. 1232 * It should NOT be accessed directly by an application, except to store 1233 * the jmp_buf. 1234 */ 1235 1236 struct png_struct_def 1237 { 1238 #ifdef PNG_SETJMP_SUPPORTED 1239 jmp_buf jmpbuf; /* used in png_error */ 1240 #endif 1241 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1242 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1243 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1244 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1245 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1246 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1247 1248 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1249 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1250 #endif 1251 1252 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1253 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1254 #endif 1255 1256 /* These were added in libpng-1.0.2 */ 1257 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1258 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1259 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1260 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1261 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1262 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1263 #endif 1264 #endif 1265 1266 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1267 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1268 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1269 1270 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1271 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1272 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1273 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1274 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1275 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1276 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1277 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1278 1279 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1280 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1281 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1282 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1283 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1284 #if 0 /* Replaced with the following in libpng-1.2.43 */ 1285 png_size_t irowbytes PNG_DEPSTRUCT; 1286 #endif 1287 /* Added in libpng-1.2.43 */ 1288 #ifdef PNG_USER_LIMITS_SUPPORTED 1289 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1290 * chunks that can be stored (0 means unlimited). 1291 */ 1292 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1293 #endif 1294 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1295 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1296 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1297 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1298 #ifndef PNG_NO_WRITE_FILTER 1299 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1300 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1301 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1302 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1303 #endif 1304 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1305 1306 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1307 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1308 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1309 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1310 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1311 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1312 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1313 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1314 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1315 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1316 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1317 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1318 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1319 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1320 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1321 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1322 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1323 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1324 1325 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1326 #ifdef PNG_LEGACY_SUPPORTED 1327 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1328 #else 1329 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1330 #endif 1331 #endif 1332 1333 #ifdef PNG_bKGD_SUPPORTED 1334 png_byte background_gamma_type PNG_DEPSTRUCT; 1335 # ifdef PNG_FLOATING_POINT_SUPPORTED 1336 float background_gamma PNG_DEPSTRUCT; 1337 # endif 1338 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1339 #ifdef PNG_READ_GAMMA_SUPPORTED 1340 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1341 #endif 1342 #endif /* PNG_bKGD_SUPPORTED */ 1343 1344 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1345 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1346 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1347 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1348 #endif 1349 1350 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1351 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1352 #ifdef PNG_FLOATING_POINT_SUPPORTED 1353 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1354 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1355 #endif 1356 #endif 1357 1358 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1359 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1360 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1361 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1362 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1363 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1364 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1365 #endif 1366 1367 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1368 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1369 #endif 1370 1371 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1372 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1373 #endif 1374 1375 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1376 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1377 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1378 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1379 #endif 1380 1381 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1382 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1383 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1384 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1385 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1386 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1387 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1388 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1389 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1390 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1391 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1392 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1393 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1394 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1395 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1396 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1397 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1398 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1399 1400 # ifdef PNG_TEXT_SUPPORTED 1401 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1402 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1403 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1404 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1405 # endif /* PNG_TEXT_SUPPORTED */ 1406 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1407 1408 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1409 /* for the Borland special 64K segment handler */ 1410 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1411 png_bytep offset_table PNG_DEPSTRUCT; 1412 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1413 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1414 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1415 #endif 1416 1417 #ifdef PNG_READ_DITHER_SUPPORTED 1418 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1419 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1420 #endif 1421 1422 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1423 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1424 #endif 1425 1426 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1427 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1428 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1429 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1430 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1431 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1432 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1433 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1434 #endif 1435 1436 #ifdef PNG_TIME_RFC1123_SUPPORTED 1437 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1438 #endif 1439 1440 /* New members added in libpng-1.0.6 */ 1441 1442 #ifdef PNG_FREE_ME_SUPPORTED 1443 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1444 #endif 1445 1446 #ifdef PNG_USER_CHUNKS_SUPPORTED 1447 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1448 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1449 #endif 1450 1451 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1452 int num_chunk_list PNG_DEPSTRUCT; 1453 png_bytep chunk_list PNG_DEPSTRUCT; 1454 #endif 1455 1456 /* New members added in libpng-1.0.3 */ 1457 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1458 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1459 /* These were changed from png_byte in libpng-1.0.6 */ 1460 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1461 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1462 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1463 #endif 1464 1465 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1466 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1467 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1468 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1469 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1470 #ifdef PNG_1_0_X 1471 png_byte mng_features_permitted PNG_DEPSTRUCT; 1472 #else 1473 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1474 #endif /* PNG_1_0_X */ 1475 #endif 1476 1477 /* New member added in libpng-1.0.7 */ 1478 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1479 png_fixed_point int_gamma PNG_DEPSTRUCT; 1480 #endif 1481 1482 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1483 #ifdef PNG_MNG_FEATURES_SUPPORTED 1484 png_byte filter_type PNG_DEPSTRUCT; 1485 #endif 1486 1487 #ifdef PNG_1_0_X 1488 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1489 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1490 #endif 1491 1492 /* New members added in libpng-1.2.0 */ 1493 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1494 # ifndef PNG_1_0_X 1495 # ifdef PNG_MMX_CODE_SUPPORTED 1496 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1497 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1498 # endif 1499 png_uint_32 asm_flags PNG_DEPSTRUCT; 1500 # endif 1501 #endif 1502 1503 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1504 #ifdef PNG_USER_MEM_SUPPORTED 1505 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1506 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1507 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1508 #endif 1509 1510 /* New member added in libpng-1.0.13 and 1.2.0 */ 1511 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1512 1513 #ifdef PNG_READ_DITHER_SUPPORTED 1514 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1515 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1516 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1517 /* in the palette */ 1518 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1519 /* palette color */ 1520 #endif 1521 1522 /* New members added in libpng-1.0.16 and 1.2.6 */ 1523 png_byte compression_type PNG_DEPSTRUCT; 1524 1525 #ifdef PNG_USER_LIMITS_SUPPORTED 1526 png_uint_32 user_width_max PNG_DEPSTRUCT; 1527 png_uint_32 user_height_max PNG_DEPSTRUCT; 1528 #endif 1529 1530 /* New member added in libpng-1.0.25 and 1.2.17 */ 1531 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1532 /* Storage for unknown chunk that the library doesn't recognize. */ 1533 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1534 #endif 1535 1536 /* New members added in libpng-1.2.26 */ 1537 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1538 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1539 1540 /* New member added in libpng-1.2.30 */ 1541 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1542 1543 1544 }; 1545 1546 1547 /* This triggers a compiler error in png.c, if png.c and png.h 1548 * do not agree upon the version number. 1549 */ 1550 typedef png_structp version_1_2_44; 1551 1552 typedef png_struct FAR * FAR * png_structpp; 1553 1554 /* Here are the function definitions most commonly used. This is not 1555 * the place to find out how to use libpng. See libpng.txt for the 1556 * full explanation, see example.c for the summary. This just provides 1557 * a simple one line description of the use of each function. 1558 */ 1559 1560 /* Returns the version number of the library */ 1561 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1562 1563 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1564 * Handling more than 8 bytes from the beginning of the file is an error. 1565 */ 1566 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1567 int num_bytes)); 1568 1569 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1570 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1571 * signature, and non-zero otherwise. Having num_to_check == 0 or 1572 * start > 7 will always fail (ie return non-zero). 1573 */ 1574 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1575 png_size_t num_to_check)); 1576 1577 /* Simple signature checking function. This is the same as calling 1578 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1579 */ 1580 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1581 1582 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1583 extern PNG_EXPORT(png_structp,png_create_read_struct) 1584 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1585 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1586 1587 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1588 extern PNG_EXPORT(png_structp,png_create_write_struct) 1589 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1590 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1591 1592 #ifdef PNG_WRITE_SUPPORTED 1593 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1594 PNGARG((png_structp png_ptr)); 1595 #endif 1596 1597 #ifdef PNG_WRITE_SUPPORTED 1598 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1599 PNGARG((png_structp png_ptr, png_uint_32 size)); 1600 #endif 1601 1602 /* Reset the compression stream */ 1603 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1604 1605 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1606 #ifdef PNG_USER_MEM_SUPPORTED 1607 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1608 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1609 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1610 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1611 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1612 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1613 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1614 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1615 #endif 1616 1617 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1618 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1619 png_bytep chunk_name, png_bytep data, png_size_t length)); 1620 1621 /* Write the start of a PNG chunk - length and chunk name. */ 1622 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1623 png_bytep chunk_name, png_uint_32 length)); 1624 1625 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1626 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1627 png_bytep data, png_size_t length)); 1628 1629 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1630 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1631 1632 /* Allocate and initialize the info structure */ 1633 extern PNG_EXPORT(png_infop,png_create_info_struct) 1634 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1635 1636 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1637 /* Initialize the info structure (old interface - DEPRECATED) */ 1638 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1639 PNG_DEPRECATED; 1640 #undef png_info_init 1641 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1642 png_sizeof(png_info)); 1643 #endif 1644 1645 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1646 png_size_t png_info_struct_size)); 1647 1648 /* Writes all the PNG information before the image. */ 1649 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1650 png_infop info_ptr)); 1651 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1652 png_infop info_ptr)); 1653 1654 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1655 /* Read the information before the actual image data. */ 1656 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1657 png_infop info_ptr)); 1658 #endif 1659 1660 #ifdef PNG_TIME_RFC1123_SUPPORTED 1661 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1662 PNGARG((png_structp png_ptr, png_timep ptime)); 1663 #endif 1664 1665 #ifdef PNG_CONVERT_tIME_SUPPORTED 1666 /* Convert from a struct tm to png_time */ 1667 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1668 struct tm FAR * ttime)); 1669 1670 /* Convert from time_t to png_time. Uses gmtime() */ 1671 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1672 time_t ttime)); 1673 #endif /* PNG_CONVERT_tIME_SUPPORTED */ 1674 1675 #ifdef PNG_READ_EXPAND_SUPPORTED 1676 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1677 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1678 #ifndef PNG_1_0_X 1679 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1680 png_ptr)); 1681 #endif 1682 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1683 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1684 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1685 /* Deprecated */ 1686 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1687 png_ptr)) PNG_DEPRECATED; 1688 #endif 1689 #endif 1690 1691 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1692 /* Use blue, green, red order for pixels. */ 1693 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1694 #endif 1695 1696 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1697 /* Expand the grayscale to 24-bit RGB if necessary. */ 1698 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1699 #endif 1700 1701 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1702 /* Reduce RGB to grayscale. */ 1703 #ifdef PNG_FLOATING_POINT_SUPPORTED 1704 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1705 int error_action, double red, double green )); 1706 #endif 1707 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1708 int error_action, png_fixed_point red, png_fixed_point green )); 1709 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1710 png_ptr)); 1711 #endif 1712 1713 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1714 png_colorp palette)); 1715 1716 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1717 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1718 #endif 1719 1720 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1721 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1722 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1723 #endif 1724 1725 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1726 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1727 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1728 #endif 1729 1730 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1731 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1732 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1733 png_uint_32 filler, int flags)); 1734 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1735 #define PNG_FILLER_BEFORE 0 1736 #define PNG_FILLER_AFTER 1 1737 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1738 #ifndef PNG_1_0_X 1739 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1740 png_uint_32 filler, int flags)); 1741 #endif 1742 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1743 1744 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1745 /* Swap bytes in 16-bit depth files. */ 1746 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1747 #endif 1748 1749 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1750 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1751 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1752 #endif 1753 1754 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1755 /* Swap packing order of pixels in bytes. */ 1756 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1757 #endif 1758 1759 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1760 /* Converts files to legal bit depths. */ 1761 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1762 png_color_8p true_bits)); 1763 #endif 1764 1765 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1766 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1767 /* Have the code handle the interlacing. Returns the number of passes. */ 1768 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1769 #endif 1770 1771 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1772 /* Invert monochrome files */ 1773 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1774 #endif 1775 1776 #ifdef PNG_READ_BACKGROUND_SUPPORTED 1777 /* Handle alpha and tRNS by replacing with a background color. */ 1778 #ifdef PNG_FLOATING_POINT_SUPPORTED 1779 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1780 png_color_16p background_color, int background_gamma_code, 1781 int need_expand, double background_gamma)); 1782 #endif 1783 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1784 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1785 #define PNG_BACKGROUND_GAMMA_FILE 2 1786 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1787 #endif 1788 1789 #ifdef PNG_READ_16_TO_8_SUPPORTED 1790 /* Strip the second byte of information from a 16-bit depth file. */ 1791 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1792 #endif 1793 1794 #ifdef PNG_READ_DITHER_SUPPORTED 1795 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1796 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1797 png_colorp palette, int num_palette, int maximum_colors, 1798 png_uint_16p histogram, int full_dither)); 1799 #endif 1800 1801 #ifdef PNG_READ_GAMMA_SUPPORTED 1802 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1803 #ifdef PNG_FLOATING_POINT_SUPPORTED 1804 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1805 double screen_gamma, double default_file_gamma)); 1806 #endif 1807 #endif 1808 1809 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1810 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1811 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1812 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1813 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1814 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1815 int empty_plte_permitted)) PNG_DEPRECATED; 1816 #endif 1817 #endif 1818 1819 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1820 /* Set how many lines between output flushes - 0 for no flushing */ 1821 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1822 /* Flush the current PNG output buffer */ 1823 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1824 #endif 1825 1826 /* Optional update palette with requested transformations */ 1827 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1828 1829 /* Optional call to update the users info structure */ 1830 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1831 png_infop info_ptr)); 1832 1833 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1834 /* Read one or more rows of image data. */ 1835 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1836 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1837 #endif 1838 1839 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1840 /* Read a row of data. */ 1841 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1842 png_bytep row, 1843 png_bytep display_row)); 1844 #endif 1845 1846 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1847 /* Read the whole image into memory at once. */ 1848 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1849 png_bytepp image)); 1850 #endif 1851 1852 /* Write a row of image data */ 1853 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1854 png_bytep row)); 1855 1856 /* Write a few rows of image data */ 1857 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1858 png_bytepp row, png_uint_32 num_rows)); 1859 1860 /* Write the image data */ 1861 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1862 png_bytepp image)); 1863 1864 /* Writes the end of the PNG file. */ 1865 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1866 png_infop info_ptr)); 1867 1868 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1869 /* Read the end of the PNG file. */ 1870 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1871 png_infop info_ptr)); 1872 #endif 1873 1874 /* Free any memory associated with the png_info_struct */ 1875 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1876 png_infopp info_ptr_ptr)); 1877 1878 /* Free any memory associated with the png_struct and the png_info_structs */ 1879 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1880 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1881 1882 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1883 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1884 png_infop end_info_ptr)) PNG_DEPRECATED; 1885 1886 /* Free any memory associated with the png_struct and the png_info_structs */ 1887 extern PNG_EXPORT(void,png_destroy_write_struct) 1888 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1889 1890 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1891 extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1892 1893 /* Set the libpng method of handling chunk CRC errors */ 1894 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1895 int crit_action, int ancil_action)); 1896 1897 /* Values for png_set_crc_action() to say how to handle CRC errors in 1898 * ancillary and critical chunks, and whether to use the data contained 1899 * therein. Note that it is impossible to "discard" data in a critical 1900 * chunk. For versions prior to 0.90, the action was always error/quit, 1901 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1902 * chunks is warn/discard. These values should NOT be changed. 1903 * 1904 * value action:critical action:ancillary 1905 */ 1906 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1907 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1908 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1909 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1910 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1911 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1912 1913 /* These functions give the user control over the scan-line filtering in 1914 * libpng and the compression methods used by zlib. These functions are 1915 * mainly useful for testing, as the defaults should work with most users. 1916 * Those users who are tight on memory or want faster performance at the 1917 * expense of compression can modify them. See the compression library 1918 * header file (zlib.h) for an explination of the compression functions. 1919 */ 1920 1921 /* Set the filtering method(s) used by libpng. Currently, the only valid 1922 * value for "method" is 0. 1923 */ 1924 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1925 int filters)); 1926 1927 /* Flags for png_set_filter() to say which filters to use. The flags 1928 * are chosen so that they don't conflict with real filter types 1929 * below, in case they are supplied instead of the #defined constants. 1930 * These values should NOT be changed. 1931 */ 1932 #define PNG_NO_FILTERS 0x00 1933 #define PNG_FILTER_NONE 0x08 1934 #define PNG_FILTER_SUB 0x10 1935 #define PNG_FILTER_UP 0x20 1936 #define PNG_FILTER_AVG 0x40 1937 #define PNG_FILTER_PAETH 0x80 1938 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1939 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1940 1941 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1942 * These defines should NOT be changed. 1943 */ 1944 #define PNG_FILTER_VALUE_NONE 0 1945 #define PNG_FILTER_VALUE_SUB 1 1946 #define PNG_FILTER_VALUE_UP 2 1947 #define PNG_FILTER_VALUE_AVG 3 1948 #define PNG_FILTER_VALUE_PAETH 4 1949 #define PNG_FILTER_VALUE_LAST 5 1950 1951 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1952 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1953 * defines, either the default (minimum-sum-of-absolute-differences), or 1954 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1955 * 1956 * Weights are factors >= 1.0, indicating how important it is to keep the 1957 * filter type consistent between rows. Larger numbers mean the current 1958 * filter is that many times as likely to be the same as the "num_weights" 1959 * previous filters. This is cumulative for each previous row with a weight. 1960 * There needs to be "num_weights" values in "filter_weights", or it can be 1961 * NULL if the weights aren't being specified. Weights have no influence on 1962 * the selection of the first row filter. Well chosen weights can (in theory) 1963 * improve the compression for a given image. 1964 * 1965 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1966 * filter type. Higher costs indicate more decoding expense, and are 1967 * therefore less likely to be selected over a filter with lower computational 1968 * costs. There needs to be a value in "filter_costs" for each valid filter 1969 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1970 * setting the costs. Costs try to improve the speed of decompression without 1971 * unduly increasing the compressed image size. 1972 * 1973 * A negative weight or cost indicates the default value is to be used, and 1974 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1975 * The default values for both weights and costs are currently 1.0, but may 1976 * change if good general weighting/cost heuristics can be found. If both 1977 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1978 * to the UNWEIGHTED method, but with added encoding time/computation. 1979 */ 1980 #ifdef PNG_FLOATING_POINT_SUPPORTED 1981 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1982 int heuristic_method, int num_weights, png_doublep filter_weights, 1983 png_doublep filter_costs)); 1984 #endif 1985 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1986 1987 /* Heuristic used for row filter selection. These defines should NOT be 1988 * changed. 1989 */ 1990 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1991 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1992 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1993 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1994 1995 /* Set the library compression level. Currently, valid values range from 1996 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1997 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1998 * shown that zlib compression levels 3-6 usually perform as well as level 9 1999 * for PNG images, and do considerably fewer caclulations. In the future, 2000 * these values may not correspond directly to the zlib compression levels. 2001 */ 2002 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2003 int level)); 2004 2005 extern PNG_EXPORT(void,png_set_compression_mem_level) 2006 PNGARG((png_structp png_ptr, int mem_level)); 2007 2008 extern PNG_EXPORT(void,png_set_compression_strategy) 2009 PNGARG((png_structp png_ptr, int strategy)); 2010 2011 extern PNG_EXPORT(void,png_set_compression_window_bits) 2012 PNGARG((png_structp png_ptr, int window_bits)); 2013 2014 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2015 int method)); 2016 2017 /* These next functions are called for input/output, memory, and error 2018 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2019 * and call standard C I/O routines such as fread(), fwrite(), and 2020 * fprintf(). These functions can be made to use other I/O routines 2021 * at run time for those applications that need to handle I/O in a 2022 * different manner by calling png_set_???_fn(). See libpng.txt for 2023 * more information. 2024 */ 2025 2026 #ifdef PNG_STDIO_SUPPORTED 2027 /* Initialize the input/output for the PNG file to the default functions. */ 2028 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2029 #endif 2030 2031 /* Replace the (error and abort), and warning functions with user 2032 * supplied functions. If no messages are to be printed you must still 2033 * write and use replacement functions. The replacement error_fn should 2034 * still do a longjmp to the last setjmp location if you are using this 2035 * method of error handling. If error_fn or warning_fn is NULL, the 2036 * default function will be used. 2037 */ 2038 2039 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2040 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2041 2042 /* Return the user pointer associated with the error functions */ 2043 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2044 2045 /* Replace the default data output functions with a user supplied one(s). 2046 * If buffered output is not used, then output_flush_fn can be set to NULL. 2047 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2048 * output_flush_fn will be ignored (and thus can be NULL). 2049 * It is probably a mistake to use NULL for output_flush_fn if 2050 * write_data_fn is not also NULL unless you have built libpng with 2051 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2052 * default flush function, which uses the standard *FILE structure, will 2053 * be used. 2054 */ 2055 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2056 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2057 2058 /* Replace the default data input function with a user supplied one. */ 2059 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2060 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2061 2062 /* Return the user pointer associated with the I/O functions */ 2063 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2064 2065 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2066 png_read_status_ptr read_row_fn)); 2067 2068 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2069 png_write_status_ptr write_row_fn)); 2070 2071 #ifdef PNG_USER_MEM_SUPPORTED 2072 /* Replace the default memory allocation functions with user supplied one(s). */ 2073 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2074 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2075 /* Return the user pointer associated with the memory functions */ 2076 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2077 #endif 2078 2079 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2080 defined(PNG_LEGACY_SUPPORTED) 2081 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2082 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2083 #endif 2084 2085 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2086 defined(PNG_LEGACY_SUPPORTED) 2087 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2088 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2089 #endif 2090 2091 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2092 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2093 defined(PNG_LEGACY_SUPPORTED) 2094 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2095 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2096 int user_transform_channels)); 2097 /* Return the user pointer associated with the user transform functions */ 2098 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2099 PNGARG((png_structp png_ptr)); 2100 #endif 2101 2102 #ifdef PNG_USER_CHUNKS_SUPPORTED 2103 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2104 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2105 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2106 png_ptr)); 2107 #endif 2108 2109 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2110 /* Sets the function callbacks for the push reader, and a pointer to a 2111 * user-defined structure available to the callback functions. 2112 */ 2113 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2114 png_voidp progressive_ptr, 2115 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2116 png_progressive_end_ptr end_fn)); 2117 2118 /* Returns the user pointer associated with the push read functions */ 2119 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2120 PNGARG((png_structp png_ptr)); 2121 2122 /* Function to be called when data becomes available */ 2123 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2124 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2125 2126 /* Function that combines rows. Not very much different than the 2127 * png_combine_row() call. Is this even used????? 2128 */ 2129 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2130 png_bytep old_row, png_bytep new_row)); 2131 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2132 2133 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2134 png_uint_32 size)) PNG_ALLOCATED; 2135 2136 #ifdef PNG_1_0_X 2137 # define png_malloc_warn png_malloc 2138 #else 2139 /* Added at libpng version 1.2.4 */ 2140 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2141 png_uint_32 size)) PNG_ALLOCATED; 2142 #endif 2143 2144 /* Frees a pointer allocated by png_malloc() */ 2145 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2146 2147 #ifdef PNG_1_0_X 2148 /* Function to allocate memory for zlib. */ 2149 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2150 uInt size)); 2151 2152 /* Function to free memory for zlib */ 2153 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2154 #endif 2155 2156 /* Free data that was allocated internally */ 2157 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2158 png_infop info_ptr, png_uint_32 free_me, int num)); 2159 #ifdef PNG_FREE_ME_SUPPORTED 2160 /* Reassign responsibility for freeing existing data, whether allocated 2161 * by libpng or by the application 2162 */ 2163 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2164 png_infop info_ptr, int freer, png_uint_32 mask)); 2165 #endif 2166 /* Assignments for png_data_freer */ 2167 #define PNG_DESTROY_WILL_FREE_DATA 1 2168 #define PNG_SET_WILL_FREE_DATA 1 2169 #define PNG_USER_WILL_FREE_DATA 2 2170 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2171 #define PNG_FREE_HIST 0x0008 2172 #define PNG_FREE_ICCP 0x0010 2173 #define PNG_FREE_SPLT 0x0020 2174 #define PNG_FREE_ROWS 0x0040 2175 #define PNG_FREE_PCAL 0x0080 2176 #define PNG_FREE_SCAL 0x0100 2177 #define PNG_FREE_UNKN 0x0200 2178 #define PNG_FREE_LIST 0x0400 2179 #define PNG_FREE_PLTE 0x1000 2180 #define PNG_FREE_TRNS 0x2000 2181 #define PNG_FREE_TEXT 0x4000 2182 #define PNG_FREE_ALL 0x7fff 2183 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2184 2185 #ifdef PNG_USER_MEM_SUPPORTED 2186 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2187 png_uint_32 size)) PNG_ALLOCATED; 2188 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2189 png_voidp ptr)); 2190 #endif 2191 2192 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2193 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2194 2195 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2196 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2197 2198 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2199 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2200 int check)); 2201 #endif /* USE_FAR_KEYWORD */ 2202 2203 #ifndef PNG_NO_ERROR_TEXT 2204 /* Fatal error in PNG image of libpng - can't continue */ 2205 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2206 png_const_charp error_message)) PNG_NORETURN; 2207 2208 /* The same, but the chunk name is prepended to the error string. */ 2209 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2210 png_const_charp error_message)) PNG_NORETURN; 2211 #else 2212 /* Fatal error in PNG image of libpng - can't continue */ 2213 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2214 #endif 2215 2216 #ifndef PNG_NO_WARNINGS 2217 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2218 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2219 png_const_charp warning_message)); 2220 2221 #ifdef PNG_READ_SUPPORTED 2222 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2223 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2224 png_const_charp warning_message)); 2225 #endif /* PNG_READ_SUPPORTED */ 2226 #endif /* PNG_NO_WARNINGS */ 2227 2228 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2229 * Similarly, the png_get_<chunk> calls are used to read values from the 2230 * png_info_struct, either storing the parameters in the passed variables, or 2231 * setting pointers into the png_info_struct where the data is stored. The 2232 * png_get_<chunk> functions return a non-zero value if the data was available 2233 * in info_ptr, or return zero and do not change any of the parameters if the 2234 * data was not available. 2235 * 2236 * These functions should be used instead of directly accessing png_info 2237 * to avoid problems with future changes in the size and internal layout of 2238 * png_info_struct. 2239 */ 2240 /* Returns "flag" if chunk data is valid in info_ptr. */ 2241 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2242 png_infop info_ptr, png_uint_32 flag)); 2243 2244 /* Returns number of bytes needed to hold a transformed row. */ 2245 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2246 png_infop info_ptr)); 2247 2248 #ifdef PNG_INFO_IMAGE_SUPPORTED 2249 /* Returns row_pointers, which is an array of pointers to scanlines that was 2250 * returned from png_read_png(). 2251 */ 2252 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2253 png_infop info_ptr)); 2254 /* Set row_pointers, which is an array of pointers to scanlines for use 2255 * by png_write_png(). 2256 */ 2257 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2258 png_infop info_ptr, png_bytepp row_pointers)); 2259 #endif 2260 2261 /* Returns number of color channels in image. */ 2262 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2263 png_infop info_ptr)); 2264 2265 #ifdef PNG_EASY_ACCESS_SUPPORTED 2266 /* Returns image width in pixels. */ 2267 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2268 png_ptr, png_infop info_ptr)); 2269 2270 /* Returns image height in pixels. */ 2271 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2272 png_ptr, png_infop info_ptr)); 2273 2274 /* Returns image bit_depth. */ 2275 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2276 png_ptr, png_infop info_ptr)); 2277 2278 /* Returns image color_type. */ 2279 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2280 png_ptr, png_infop info_ptr)); 2281 2282 /* Returns image filter_type. */ 2283 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2284 png_ptr, png_infop info_ptr)); 2285 2286 /* Returns image interlace_type. */ 2287 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2288 png_ptr, png_infop info_ptr)); 2289 2290 /* Returns image compression_type. */ 2291 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2292 png_ptr, png_infop info_ptr)); 2293 2294 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2295 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2296 png_ptr, png_infop info_ptr)); 2297 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2298 png_ptr, png_infop info_ptr)); 2299 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2300 png_ptr, png_infop info_ptr)); 2301 2302 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2303 #ifdef PNG_FLOATING_POINT_SUPPORTED 2304 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2305 png_ptr, png_infop info_ptr)); 2306 #endif 2307 2308 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2309 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2310 png_ptr, png_infop info_ptr)); 2311 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2312 png_ptr, png_infop info_ptr)); 2313 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2314 png_ptr, png_infop info_ptr)); 2315 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2316 png_ptr, png_infop info_ptr)); 2317 2318 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2319 2320 /* Returns pointer to signature string read from PNG header */ 2321 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2322 png_infop info_ptr)); 2323 2324 #ifdef PNG_bKGD_SUPPORTED 2325 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2326 png_infop info_ptr, png_color_16p *background)); 2327 #endif 2328 2329 #ifdef PNG_bKGD_SUPPORTED 2330 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2331 png_infop info_ptr, png_color_16p background)); 2332 #endif 2333 2334 #ifdef PNG_cHRM_SUPPORTED 2335 #ifdef PNG_FLOATING_POINT_SUPPORTED 2336 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2337 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2338 double *red_y, double *green_x, double *green_y, double *blue_x, 2339 double *blue_y)); 2340 #endif 2341 #ifdef PNG_FIXED_POINT_SUPPORTED 2342 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2343 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2344 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2345 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2346 *int_blue_x, png_fixed_point *int_blue_y)); 2347 #endif 2348 #endif 2349 2350 #ifdef PNG_cHRM_SUPPORTED 2351 #ifdef PNG_FLOATING_POINT_SUPPORTED 2352 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2353 png_infop info_ptr, double white_x, double white_y, double red_x, 2354 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2355 #endif 2356 #ifdef PNG_FIXED_POINT_SUPPORTED 2357 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2358 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2359 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2360 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2361 png_fixed_point int_blue_y)); 2362 #endif 2363 #endif 2364 2365 #ifdef PNG_gAMA_SUPPORTED 2366 #ifdef PNG_FLOATING_POINT_SUPPORTED 2367 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2368 png_infop info_ptr, double *file_gamma)); 2369 #endif 2370 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2371 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2372 #endif 2373 2374 #ifdef PNG_gAMA_SUPPORTED 2375 #ifdef PNG_FLOATING_POINT_SUPPORTED 2376 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2377 png_infop info_ptr, double file_gamma)); 2378 #endif 2379 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2380 png_infop info_ptr, png_fixed_point int_file_gamma)); 2381 #endif 2382 2383 #ifdef PNG_hIST_SUPPORTED 2384 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2385 png_infop info_ptr, png_uint_16p *hist)); 2386 #endif 2387 2388 #ifdef PNG_hIST_SUPPORTED 2389 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2390 png_infop info_ptr, png_uint_16p hist)); 2391 #endif 2392 2393 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2394 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2395 int *bit_depth, int *color_type, int *interlace_method, 2396 int *compression_method, int *filter_method)); 2397 2398 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2399 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2400 int color_type, int interlace_method, int compression_method, 2401 int filter_method)); 2402 2403 #ifdef PNG_oFFs_SUPPORTED 2404 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2405 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2406 int *unit_type)); 2407 #endif 2408 2409 #ifdef PNG_oFFs_SUPPORTED 2410 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2411 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2412 int unit_type)); 2413 #endif 2414 2415 #ifdef PNG_pCAL_SUPPORTED 2416 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2417 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2418 int *type, int *nparams, png_charp *units, png_charpp *params)); 2419 #endif 2420 2421 #ifdef PNG_pCAL_SUPPORTED 2422 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2423 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2424 int type, int nparams, png_charp units, png_charpp params)); 2425 #endif 2426 2427 #ifdef PNG_pHYs_SUPPORTED 2428 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2429 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2430 #endif 2431 2432 #ifdef PNG_pHYs_SUPPORTED 2433 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2434 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2435 #endif 2436 2437 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2438 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2439 2440 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2441 png_infop info_ptr, png_colorp palette, int num_palette)); 2442 2443 #ifdef PNG_sBIT_SUPPORTED 2444 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2445 png_infop info_ptr, png_color_8p *sig_bit)); 2446 #endif 2447 2448 #ifdef PNG_sBIT_SUPPORTED 2449 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2450 png_infop info_ptr, png_color_8p sig_bit)); 2451 #endif 2452 2453 #ifdef PNG_sRGB_SUPPORTED 2454 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2455 png_infop info_ptr, int *intent)); 2456 #endif 2457 2458 #ifdef PNG_sRGB_SUPPORTED 2459 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2460 png_infop info_ptr, int intent)); 2461 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2462 png_infop info_ptr, int intent)); 2463 #endif 2464 2465 #ifdef PNG_iCCP_SUPPORTED 2466 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2467 png_infop info_ptr, png_charpp name, int *compression_type, 2468 png_charpp profile, png_uint_32 *proflen)); 2469 /* Note to maintainer: profile should be png_bytepp */ 2470 #endif 2471 2472 #ifdef PNG_iCCP_SUPPORTED 2473 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2474 png_infop info_ptr, png_charp name, int compression_type, 2475 png_charp profile, png_uint_32 proflen)); 2476 /* Note to maintainer: profile should be png_bytep */ 2477 #endif 2478 2479 #ifdef PNG_sPLT_SUPPORTED 2480 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2481 png_infop info_ptr, png_sPLT_tpp entries)); 2482 #endif 2483 2484 #ifdef PNG_sPLT_SUPPORTED 2485 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2486 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2487 #endif 2488 2489 #ifdef PNG_TEXT_SUPPORTED 2490 /* png_get_text also returns the number of text chunks in *num_text */ 2491 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2492 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2493 #endif 2494 2495 /* 2496 * Note while png_set_text() will accept a structure whose text, 2497 * language, and translated keywords are NULL pointers, the structure 2498 * returned by png_get_text will always contain regular 2499 * zero-terminated C strings. They might be empty strings but 2500 * they will never be NULL pointers. 2501 */ 2502 2503 #ifdef PNG_TEXT_SUPPORTED 2504 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2505 png_infop info_ptr, png_textp text_ptr, int num_text)); 2506 #endif 2507 2508 #ifdef PNG_tIME_SUPPORTED 2509 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2510 png_infop info_ptr, png_timep *mod_time)); 2511 #endif 2512 2513 #ifdef PNG_tIME_SUPPORTED 2514 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2515 png_infop info_ptr, png_timep mod_time)); 2516 #endif 2517 2518 #ifdef PNG_tRNS_SUPPORTED 2519 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2520 png_infop info_ptr, png_bytep *trans, int *num_trans, 2521 png_color_16p *trans_values)); 2522 #endif 2523 2524 #ifdef PNG_tRNS_SUPPORTED 2525 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2526 png_infop info_ptr, png_bytep trans, int num_trans, 2527 png_color_16p trans_values)); 2528 #endif 2529 2530 #ifdef PNG_tRNS_SUPPORTED 2531 #endif 2532 2533 #ifdef PNG_sCAL_SUPPORTED 2534 #ifdef PNG_FLOATING_POINT_SUPPORTED 2535 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2536 png_infop info_ptr, int *unit, double *width, double *height)); 2537 #else 2538 #ifdef PNG_FIXED_POINT_SUPPORTED 2539 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2540 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2541 #endif 2542 #endif 2543 #endif /* PNG_sCAL_SUPPORTED */ 2544 2545 #ifdef PNG_sCAL_SUPPORTED 2546 #ifdef PNG_FLOATING_POINT_SUPPORTED 2547 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2548 png_infop info_ptr, int unit, double width, double height)); 2549 #else 2550 #ifdef PNG_FIXED_POINT_SUPPORTED 2551 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2552 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2553 #endif 2554 #endif 2555 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2556 2557 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2558 /* Provide a list of chunks and how they are to be handled, if the built-in 2559 handling or default unknown chunk handling is not desired. Any chunks not 2560 listed will be handled in the default manner. The IHDR and IEND chunks 2561 must not be listed. 2562 keep = 0: follow default behaviour 2563 = 1: do not keep 2564 = 2: keep only if safe-to-copy 2565 = 3: keep even if unsafe-to-copy 2566 */ 2567 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2568 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2569 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2570 chunk_name)); 2571 #endif 2572 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2573 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2574 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2575 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2576 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2577 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2578 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2579 #endif 2580 2581 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2582 * If you need to turn it off for a chunk that your application has freed, 2583 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2584 */ 2585 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2586 png_infop info_ptr, int mask)); 2587 2588 #ifdef PNG_INFO_IMAGE_SUPPORTED 2589 /* The "params" pointer is currently not used and is for future expansion. */ 2590 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2591 png_infop info_ptr, 2592 int transforms, 2593 png_voidp params)); 2594 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2595 png_infop info_ptr, 2596 int transforms, 2597 png_voidp params)); 2598 #endif 2599 2600 /* Define PNG_DEBUG at compile time for debugging information. Higher 2601 * numbers for PNG_DEBUG mean more debugging information. This has 2602 * only been added since version 0.95 so it is not implemented throughout 2603 * libpng yet, but more support will be added as needed. 2604 */ 2605 #ifdef PNG_DEBUG 2606 #if (PNG_DEBUG > 0) 2607 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2608 #include <crtdbg.h> 2609 #if (PNG_DEBUG > 1) 2610 #ifndef _DEBUG 2611 # define _DEBUG 2612 #endif 2613 #ifndef png_debug 2614 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2615 #endif 2616 #ifndef png_debug1 2617 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2618 #endif 2619 #ifndef png_debug2 2620 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2621 #endif 2622 #endif 2623 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2624 #ifndef PNG_DEBUG_FILE 2625 #define PNG_DEBUG_FILE stderr 2626 #endif /* PNG_DEBUG_FILE */ 2627 2628 #if (PNG_DEBUG > 1) 2629 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2630 * compilers. 2631 */ 2632 # ifdef __STDC__ 2633 # ifndef png_debug 2634 # define png_debug(l,m) \ 2635 { \ 2636 int num_tabs=l; \ 2637 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2638 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2639 } 2640 # endif 2641 # ifndef png_debug1 2642 # define png_debug1(l,m,p1) \ 2643 { \ 2644 int num_tabs=l; \ 2645 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2646 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2647 } 2648 # endif 2649 # ifndef png_debug2 2650 # define png_debug2(l,m,p1,p2) \ 2651 { \ 2652 int num_tabs=l; \ 2653 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2654 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2655 } 2656 # endif 2657 # else /* __STDC __ */ 2658 # ifndef png_debug 2659 # define png_debug(l,m) \ 2660 { \ 2661 int num_tabs=l; \ 2662 char format[256]; \ 2663 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2664 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2665 m,PNG_STRING_NEWLINE); \ 2666 fprintf(PNG_DEBUG_FILE,format); \ 2667 } 2668 # endif 2669 # ifndef png_debug1 2670 # define png_debug1(l,m,p1) \ 2671 { \ 2672 int num_tabs=l; \ 2673 char format[256]; \ 2674 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2675 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2676 m,PNG_STRING_NEWLINE); \ 2677 fprintf(PNG_DEBUG_FILE,format,p1); \ 2678 } 2679 # endif 2680 # ifndef png_debug2 2681 # define png_debug2(l,m,p1,p2) \ 2682 { \ 2683 int num_tabs=l; \ 2684 char format[256]; \ 2685 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2686 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2687 m,PNG_STRING_NEWLINE); \ 2688 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2689 } 2690 # endif 2691 # endif /* __STDC __ */ 2692 #endif /* (PNG_DEBUG > 1) */ 2693 2694 #endif /* _MSC_VER */ 2695 #endif /* (PNG_DEBUG > 0) */ 2696 #endif /* PNG_DEBUG */ 2697 #ifndef png_debug 2698 #define png_debug(l, m) 2699 #endif 2700 #ifndef png_debug1 2701 #define png_debug1(l, m, p1) 2702 #endif 2703 #ifndef png_debug2 2704 #define png_debug2(l, m, p1, p2) 2705 #endif 2706 2707 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2708 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2709 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2710 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2711 2712 #ifdef PNG_MNG_FEATURES_SUPPORTED 2713 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2714 png_ptr, png_uint_32 mng_features_permitted)); 2715 #endif 2716 2717 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2718 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2719 #define PNG_HANDLE_CHUNK_NEVER 1 2720 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2721 #define PNG_HANDLE_CHUNK_ALWAYS 3 2722 2723 /* Added to version 1.2.0 */ 2724 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2725 #ifdef PNG_MMX_CODE_SUPPORTED 2726 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2727 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2728 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2729 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2730 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2731 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2732 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2733 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2734 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2735 2736 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2737 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2738 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2739 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2740 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2741 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2742 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2743 2744 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2745 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2746 | PNG_MMX_READ_FLAGS \ 2747 | PNG_MMX_WRITE_FLAGS ) 2748 2749 #define PNG_SELECT_READ 1 2750 #define PNG_SELECT_WRITE 2 2751 #endif /* PNG_MMX_CODE_SUPPORTED */ 2752 2753 #ifndef PNG_1_0_X 2754 /* pngget.c */ 2755 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2756 PNGARG((int flag_select, int *compilerID)); 2757 2758 /* pngget.c */ 2759 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2760 PNGARG((int flag_select)); 2761 2762 /* pngget.c */ 2763 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2764 PNGARG((png_structp png_ptr)); 2765 2766 /* pngget.c */ 2767 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2768 PNGARG((png_structp png_ptr)); 2769 2770 /* pngget.c */ 2771 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2772 PNGARG((png_structp png_ptr)); 2773 2774 /* pngset.c */ 2775 extern PNG_EXPORT(void,png_set_asm_flags) 2776 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2777 2778 /* pngset.c */ 2779 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2780 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2781 png_uint_32 mmx_rowbytes_threshold)); 2782 2783 #endif /* PNG_1_0_X */ 2784 2785 #ifndef PNG_1_0_X 2786 /* png.c, pnggccrd.c, or pngvcrd.c */ 2787 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2788 #endif /* PNG_1_0_X */ 2789 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2790 2791 /* Strip the prepended error numbers ("#nnn ") from error and warning 2792 * messages before passing them to the error or warning handler. 2793 */ 2794 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2795 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2796 png_ptr, png_uint_32 strip_mode)); 2797 #endif 2798 2799 /* Added at libpng-1.2.6 */ 2800 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2801 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2802 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2803 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2804 png_ptr)); 2805 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2806 png_ptr)); 2807 #endif 2808 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2809 * project defs 2810 */ 2811 2812 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2813 /* With these routines we avoid an integer divide, which will be slower on 2814 * most machines. However, it does take more operations than the corresponding 2815 * divide method, so it may be slower on a few RISC systems. There are two 2816 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2817 * 2818 * Note that the rounding factors are NOT supposed to be the same! 128 and 2819 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2820 * standard method. 2821 * 2822 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2823 */ 2824 2825 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2826 2827 # define png_composite(composite, fg, alpha, bg) \ 2828 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2829 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2830 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2831 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2832 2833 # define png_composite_16(composite, fg, alpha, bg) \ 2834 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2835 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2836 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2837 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2838 2839 #else /* Standard method using integer division */ 2840 2841 # define png_composite(composite, fg, alpha, bg) \ 2842 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2843 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2844 (png_uint_16)127) / 255) 2845 2846 # define png_composite_16(composite, fg, alpha, bg) \ 2847 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2848 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2849 (png_uint_32)32767) / (png_uint_32)65535L) 2850 2851 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2852 2853 /* Inline macros to do direct reads of bytes from the input buffer. These 2854 * require that you are using an architecture that uses PNG byte ordering 2855 * (MSB first) and supports unaligned data storage. I think that PowerPC 2856 * in big-endian mode and 680x0 are the only ones that will support this. 2857 * The x86 line of processors definitely do not. The png_get_int_32() 2858 * routine also assumes we are using two's complement format for negative 2859 * values, which is almost certainly true. 2860 */ 2861 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2862 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2863 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2864 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2865 #else 2866 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2867 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2868 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2869 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2870 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2871 PNGARG((png_structp png_ptr, png_bytep buf)); 2872 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2873 2874 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2875 */ 2876 extern PNG_EXPORT(void,png_save_uint_32) 2877 PNGARG((png_bytep buf, png_uint_32 i)); 2878 extern PNG_EXPORT(void,png_save_int_32) 2879 PNGARG((png_bytep buf, png_int_32 i)); 2880 2881 /* Place a 16-bit number into a buffer in PNG byte order. 2882 * The parameter is declared unsigned int, not png_uint_16, 2883 * just to avoid potential problems on pre-ANSI C compilers. 2884 */ 2885 extern PNG_EXPORT(void,png_save_uint_16) 2886 PNGARG((png_bytep buf, unsigned int i)); 2887 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2888 2889 /* ************************************************************************* */ 2890 2891 /* These next functions are used internally in the code. They generally 2892 * shouldn't be used unless you are writing code to add or replace some 2893 * functionality in libpng. More information about most functions can 2894 * be found in the files where the functions are located. 2895 */ 2896 2897 2898 /* Various modes of operation, that are visible to applications because 2899 * they are used for unknown chunk location. 2900 */ 2901 #define PNG_HAVE_IHDR 0x01 2902 #define PNG_HAVE_PLTE 0x02 2903 #define PNG_HAVE_IDAT 0x04 2904 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2905 #define PNG_HAVE_IEND 0x10 2906 2907 #ifdef PNG_INTERNAL 2908 2909 /* More modes of operation. Note that after an init, mode is set to 2910 * zero automatically when the structure is created. 2911 */ 2912 #define PNG_HAVE_gAMA 0x20 2913 #define PNG_HAVE_cHRM 0x40 2914 #define PNG_HAVE_sRGB 0x80 2915 #define PNG_HAVE_CHUNK_HEADER 0x100 2916 #define PNG_WROTE_tIME 0x200 2917 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2918 #define PNG_BACKGROUND_IS_GRAY 0x800 2919 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2920 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2921 2922 /* Flags for the transformations the PNG library does on the image data */ 2923 #define PNG_BGR 0x0001 2924 #define PNG_INTERLACE 0x0002 2925 #define PNG_PACK 0x0004 2926 #define PNG_SHIFT 0x0008 2927 #define PNG_SWAP_BYTES 0x0010 2928 #define PNG_INVERT_MONO 0x0020 2929 #define PNG_DITHER 0x0040 2930 #define PNG_BACKGROUND 0x0080 2931 #define PNG_BACKGROUND_EXPAND 0x0100 2932 /* 0x0200 unused */ 2933 #define PNG_16_TO_8 0x0400 2934 #define PNG_RGBA 0x0800 2935 #define PNG_EXPAND 0x1000 2936 #define PNG_GAMMA 0x2000 2937 #define PNG_GRAY_TO_RGB 0x4000 2938 #define PNG_FILLER 0x8000L 2939 #define PNG_PACKSWAP 0x10000L 2940 #define PNG_SWAP_ALPHA 0x20000L 2941 #define PNG_STRIP_ALPHA 0x40000L 2942 #define PNG_INVERT_ALPHA 0x80000L 2943 #define PNG_USER_TRANSFORM 0x100000L 2944 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2945 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2946 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2947 /* 0x800000L Unused */ 2948 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2949 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2950 #define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 2951 /* by volker */ 2952 /* 0x8000000L unused */ 2953 /* 0x10000000L unused */ 2954 /* 0x20000000L unused */ 2955 /* 0x40000000L unused */ 2956 2957 /* Flags for png_create_struct */ 2958 #define PNG_STRUCT_PNG 0x0001 2959 #define PNG_STRUCT_INFO 0x0002 2960 2961 /* Scaling factor for filter heuristic weighting calculations */ 2962 #define PNG_WEIGHT_SHIFT 8 2963 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2964 #define PNG_COST_SHIFT 3 2965 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2966 2967 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2968 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2969 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2970 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2971 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2972 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2973 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2974 #define PNG_FLAG_ROW_INIT 0x0040 2975 #define PNG_FLAG_FILLER_AFTER 0x0080 2976 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2977 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2978 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2979 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2980 #define PNG_FLAG_FREE_PLTE 0x1000 2981 #define PNG_FLAG_FREE_TRNS 0x2000 2982 #define PNG_FLAG_FREE_HIST 0x4000 2983 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2984 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2985 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2986 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2987 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2988 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2989 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2990 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2991 /* 0x800000L unused */ 2992 /* 0x1000000L unused */ 2993 /* 0x2000000L unused */ 2994 /* 0x4000000L unused */ 2995 /* 0x8000000L unused */ 2996 /* 0x10000000L unused */ 2997 /* 0x20000000L unused */ 2998 /* 0x40000000L unused */ 2999 3000 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3001 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3002 3003 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3004 PNG_FLAG_CRC_CRITICAL_IGNORE) 3005 3006 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3007 PNG_FLAG_CRC_CRITICAL_MASK) 3008 3009 /* Save typing and make code easier to understand */ 3010 3011 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3012 abs((int)((c1).green) - (int)((c2).green)) + \ 3013 abs((int)((c1).blue) - (int)((c2).blue))) 3014 3015 /* Added to libpng-1.2.6 JB */ 3016 #define PNG_ROWBYTES(pixel_bits, width) \ 3017 ((pixel_bits) >= 8 ? \ 3018 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3019 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3020 3021 /* PNG_OUT_OF_RANGE returns true if value is outside the range 3022 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3023 * "ideal" and "delta" should be constants, normally simple 3024 * integers, "value" a variable. Added to libpng-1.2.6 JB 3025 */ 3026 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3027 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3028 3029 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3030 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3031 /* Place to hold the signature string for a PNG file. */ 3032 #ifdef PNG_USE_GLOBAL_ARRAYS 3033 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3034 #else 3035 #endif 3036 #endif /* PNG_NO_EXTERN */ 3037 3038 /* Constant strings for known chunk types. If you need to add a chunk, 3039 * define the name here, and add an invocation of the macro in png.c and 3040 * wherever it's needed. 3041 */ 3042 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3043 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3044 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3045 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3046 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3047 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3048 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3049 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3050 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3051 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3052 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3053 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3054 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3055 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3056 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3057 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3058 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3059 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3060 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3061 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3062 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3063 3064 #ifdef PNG_USE_GLOBAL_ARRAYS 3065 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3066 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3067 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3068 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3069 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3070 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3071 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3072 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3073 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3074 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3075 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3076 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3077 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3078 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3079 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3080 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3081 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3082 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3083 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3084 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3085 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3086 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3087 3088 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3089 /* Initialize png_ptr struct for reading, and allocate any other memory. 3090 * (old interface - DEPRECATED - use png_create_read_struct instead). 3091 */ 3092 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3093 PNG_DEPRECATED; 3094 #undef png_read_init 3095 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3096 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3097 #endif 3098 3099 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3100 png_const_charp user_png_ver, png_size_t png_struct_size)); 3101 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3102 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3103 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3104 png_info_size)); 3105 #endif 3106 3107 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3108 /* Initialize png_ptr struct for writing, and allocate any other memory. 3109 * (old interface - DEPRECATED - use png_create_write_struct instead). 3110 */ 3111 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3112 PNG_DEPRECATED; 3113 #undef png_write_init 3114 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3115 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3116 #endif 3117 3118 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3119 png_const_charp user_png_ver, png_size_t png_struct_size)); 3120 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3121 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3122 png_info_size)); 3123 3124 /* Allocate memory for an internal libpng struct */ 3125 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3126 3127 /* Free memory from internal libpng struct */ 3128 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3129 3130 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3131 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3132 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3133 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3134 3135 /* Free any memory that info_ptr points to and reset struct. */ 3136 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3137 png_infop info_ptr)) PNG_PRIVATE; 3138 3139 #ifndef PNG_1_0_X 3140 /* Function to allocate memory for zlib. */ 3141 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3142 uInt size)) PNG_PRIVATE; 3143 3144 /* Function to free memory for zlib */ 3145 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3146 3147 #ifdef PNG_SIZE_T 3148 /* Function to convert a sizeof an item to png_sizeof item */ 3149 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3150 PNG_PRIVATE; 3151 #endif 3152 3153 /* Next four functions are used internally as callbacks. PNGAPI is required 3154 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3155 */ 3156 3157 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3158 png_bytep data, png_size_t length)) PNG_PRIVATE; 3159 3160 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3161 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3162 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3163 #endif 3164 3165 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3166 png_bytep data, png_size_t length)) PNG_PRIVATE; 3167 3168 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3169 #ifdef PNG_STDIO_SUPPORTED 3170 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3171 PNG_PRIVATE; 3172 #endif 3173 #endif 3174 #else /* PNG_1_0_X */ 3175 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3176 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3177 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3178 #endif 3179 #endif /* PNG_1_0_X */ 3180 3181 /* Reset the CRC variable */ 3182 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3183 3184 /* Write the "data" buffer to whatever output you are using. */ 3185 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3186 png_size_t length)) PNG_PRIVATE; 3187 3188 /* Read data from whatever input you are using into the "data" buffer */ 3189 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3190 png_size_t length)) PNG_PRIVATE; 3191 3192 /* Read bytes into buf, and update png_ptr->crc */ 3193 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3194 png_size_t length)) PNG_PRIVATE; 3195 3196 /* Decompress data in a chunk that uses compression */ 3197 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3198 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3199 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3200 int comp_type, png_size_t chunklength, 3201 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3202 #endif 3203 3204 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3205 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3206 PNG_PRIVATE); 3207 3208 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3209 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3210 3211 /* Calculate the CRC over a section of data. Note that we are only 3212 * passing a maximum of 64K on systems that have this as a memory limit, 3213 * since this is the maximum buffer size we can specify. 3214 */ 3215 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3216 png_size_t length)) PNG_PRIVATE; 3217 3218 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3219 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3220 #endif 3221 3222 /* Simple function to write the signature */ 3223 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3224 3225 /* Write various chunks */ 3226 3227 /* Write the IHDR chunk, and update the png_struct with the necessary 3228 * information. 3229 */ 3230 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3231 png_uint_32 height, 3232 int bit_depth, int color_type, int compression_method, int filter_method, 3233 int interlace_method)) PNG_PRIVATE; 3234 3235 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3236 png_uint_32 num_pal)) PNG_PRIVATE; 3237 3238 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3239 png_size_t length)) PNG_PRIVATE; 3240 3241 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3242 3243 #ifdef PNG_WRITE_gAMA_SUPPORTED 3244 #ifdef PNG_FLOATING_POINT_SUPPORTED 3245 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3246 PNG_PRIVATE; 3247 #endif 3248 #ifdef PNG_FIXED_POINT_SUPPORTED 3249 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3250 png_fixed_point file_gamma)) PNG_PRIVATE; 3251 #endif 3252 #endif 3253 3254 #ifdef PNG_WRITE_sBIT_SUPPORTED 3255 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3256 int color_type)) PNG_PRIVATE; 3257 #endif 3258 3259 #ifdef PNG_WRITE_cHRM_SUPPORTED 3260 #ifdef PNG_FLOATING_POINT_SUPPORTED 3261 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3262 double white_x, double white_y, 3263 double red_x, double red_y, double green_x, double green_y, 3264 double blue_x, double blue_y)) PNG_PRIVATE; 3265 #endif 3266 #ifdef PNG_FIXED_POINT_SUPPORTED 3267 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3268 png_fixed_point int_white_x, png_fixed_point int_white_y, 3269 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3270 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3271 png_fixed_point int_blue_y)) PNG_PRIVATE; 3272 #endif 3273 #endif 3274 3275 #ifdef PNG_WRITE_sRGB_SUPPORTED 3276 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3277 int intent)) PNG_PRIVATE; 3278 #endif 3279 3280 #ifdef PNG_WRITE_iCCP_SUPPORTED 3281 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3282 png_charp name, int compression_type, 3283 png_charp profile, int proflen)) PNG_PRIVATE; 3284 /* Note to maintainer: profile should be png_bytep */ 3285 #endif 3286 3287 #ifdef PNG_WRITE_sPLT_SUPPORTED 3288 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3289 png_sPLT_tp palette)) PNG_PRIVATE; 3290 #endif 3291 3292 #ifdef PNG_WRITE_tRNS_SUPPORTED 3293 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3294 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3295 #endif 3296 3297 #ifdef PNG_WRITE_bKGD_SUPPORTED 3298 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3299 png_color_16p values, int color_type)) PNG_PRIVATE; 3300 #endif 3301 3302 #ifdef PNG_WRITE_hIST_SUPPORTED 3303 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3304 int num_hist)) PNG_PRIVATE; 3305 #endif 3306 3307 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3308 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3309 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3310 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3311 #endif 3312 3313 #ifdef PNG_WRITE_tEXt_SUPPORTED 3314 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3315 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3316 #endif 3317 3318 #ifdef PNG_WRITE_zTXt_SUPPORTED 3319 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3320 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3321 #endif 3322 3323 #ifdef PNG_WRITE_iTXt_SUPPORTED 3324 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3325 int compression, png_charp key, png_charp lang, png_charp lang_key, 3326 png_charp text)) PNG_PRIVATE; 3327 #endif 3328 3329 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3330 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3331 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3332 #endif 3333 3334 #ifdef PNG_WRITE_oFFs_SUPPORTED 3335 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3336 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3337 #endif 3338 3339 #ifdef PNG_WRITE_pCAL_SUPPORTED 3340 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3341 png_int_32 X0, png_int_32 X1, int type, int nparams, 3342 png_charp units, png_charpp params)) PNG_PRIVATE; 3343 #endif 3344 3345 #ifdef PNG_WRITE_pHYs_SUPPORTED 3346 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3347 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3348 int unit_type)) PNG_PRIVATE; 3349 #endif 3350 3351 #ifdef PNG_WRITE_tIME_SUPPORTED 3352 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3353 png_timep mod_time)) PNG_PRIVATE; 3354 #endif 3355 3356 #ifdef PNG_WRITE_sCAL_SUPPORTED 3357 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3358 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3359 int unit, double width, double height)) PNG_PRIVATE; 3360 #else 3361 #ifdef PNG_FIXED_POINT_SUPPORTED 3362 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3363 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3364 #endif 3365 #endif 3366 #endif 3367 3368 /* Called when finished processing a row of data */ 3369 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3370 3371 /* Internal use only. Called before first row of data */ 3372 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3373 3374 #ifdef PNG_READ_GAMMA_SUPPORTED 3375 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3376 #endif 3377 3378 /* Combine a row of data, dealing with alpha, etc. if requested */ 3379 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3380 int mask)) PNG_PRIVATE; 3381 3382 #ifdef PNG_READ_INTERLACING_SUPPORTED 3383 /* Expand an interlaced row */ 3384 /* OLD pre-1.0.9 interface: 3385 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3386 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3387 */ 3388 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3389 #endif 3390 3391 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3392 3393 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 3394 /* Grab pixels out of a row for an interlaced pass */ 3395 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3396 png_bytep row, int pass)) PNG_PRIVATE; 3397 #endif 3398 3399 /* Unfilter a row */ 3400 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3401 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3402 int filter)) PNG_PRIVATE; 3403 3404 /* Choose the best filter to use and filter the row data */ 3405 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3406 png_row_infop row_info)) PNG_PRIVATE; 3407 3408 /* Write out the filtered row. */ 3409 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3410 png_bytep filtered_row)) PNG_PRIVATE; 3411 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3412 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3413 3414 /* Initialize the row buffers, etc. */ 3415 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3416 /* Optional call to update the users info structure */ 3417 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3418 png_infop info_ptr)) PNG_PRIVATE; 3419 3420 /* These are the functions that do the transformations */ 3421 #ifdef PNG_READ_FILLER_SUPPORTED 3422 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3423 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3424 #endif 3425 3426 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3427 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3428 png_bytep row)) PNG_PRIVATE; 3429 #endif 3430 3431 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3432 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3433 png_bytep row)) PNG_PRIVATE; 3434 #endif 3435 3436 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3437 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3438 png_bytep row)) PNG_PRIVATE; 3439 #endif 3440 3441 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3442 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3443 png_bytep row)) PNG_PRIVATE; 3444 #endif 3445 3446 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3447 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3448 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3449 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3450 #endif 3451 3452 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3453 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3454 png_bytep row)) PNG_PRIVATE; 3455 #endif 3456 3457 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3458 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3459 png_bytep row)) PNG_PRIVATE; 3460 #endif 3461 3462 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3463 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3464 row_info, png_bytep row)) PNG_PRIVATE; 3465 #endif 3466 3467 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3468 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3469 png_bytep row)) PNG_PRIVATE; 3470 #endif 3471 3472 #ifdef PNG_READ_PACK_SUPPORTED 3473 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3474 png_bytep row)) PNG_PRIVATE; 3475 #endif 3476 3477 #ifdef PNG_READ_SHIFT_SUPPORTED 3478 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3479 png_color_8p sig_bits)) PNG_PRIVATE; 3480 #endif 3481 3482 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3483 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3484 png_bytep row)) PNG_PRIVATE; 3485 #endif 3486 3487 #ifdef PNG_READ_16_TO_8_SUPPORTED 3488 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3489 png_bytep row)) PNG_PRIVATE; 3490 #endif 3491 3492 #ifdef PNG_READ_DITHER_SUPPORTED 3493 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3494 png_bytep row, png_bytep palette_lookup, 3495 png_bytep dither_lookup)) PNG_PRIVATE; 3496 3497 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 3498 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3499 png_colorp palette, int num_palette)) PNG_PRIVATE; 3500 # endif 3501 #endif 3502 3503 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3504 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3505 png_bytep row)) PNG_PRIVATE; 3506 #endif 3507 3508 #ifdef PNG_WRITE_PACK_SUPPORTED 3509 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3510 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3511 #endif 3512 3513 #ifdef PNG_WRITE_SHIFT_SUPPORTED 3514 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3515 png_color_8p bit_depth)) PNG_PRIVATE; 3516 #endif 3517 3518 #ifdef PNG_READ_BACKGROUND_SUPPORTED 3519 #ifdef PNG_READ_GAMMA_SUPPORTED 3520 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3521 png_color_16p trans_values, png_color_16p background, 3522 png_color_16p background_1, 3523 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3524 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3525 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3526 #else 3527 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3528 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3529 #endif 3530 #endif 3531 3532 #ifdef PNG_READ_GAMMA_SUPPORTED 3533 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3534 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3535 int gamma_shift)) PNG_PRIVATE; 3536 #endif 3537 3538 #ifdef PNG_READ_EXPAND_SUPPORTED 3539 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3540 png_bytep row, png_colorp palette, png_bytep trans, 3541 int num_trans)) PNG_PRIVATE; 3542 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3543 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3544 #endif 3545 3546 /* The following decodes the appropriate chunks, and does error correction, 3547 * then calls the appropriate callback for the chunk if it is valid. 3548 */ 3549 3550 /* Decode the IHDR chunk */ 3551 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3552 png_uint_32 length)) PNG_PRIVATE; 3553 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3554 png_uint_32 length)); 3555 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3556 png_uint_32 length)); 3557 3558 #ifdef PNG_READ_bKGD_SUPPORTED 3559 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3560 png_uint_32 length)) PNG_PRIVATE; 3561 #endif 3562 3563 #ifdef PNG_READ_cHRM_SUPPORTED 3564 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3565 png_uint_32 length)) PNG_PRIVATE; 3566 #endif 3567 3568 #ifdef PNG_READ_gAMA_SUPPORTED 3569 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3570 png_uint_32 length)) PNG_PRIVATE; 3571 #endif 3572 3573 #ifdef PNG_READ_hIST_SUPPORTED 3574 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3575 png_uint_32 length)) PNG_PRIVATE; 3576 #endif 3577 3578 #ifdef PNG_READ_iCCP_SUPPORTED 3579 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3580 png_uint_32 length)); 3581 #endif /* PNG_READ_iCCP_SUPPORTED */ 3582 3583 #ifdef PNG_READ_iTXt_SUPPORTED 3584 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3585 png_uint_32 length)) PNG_PRIVATE; 3586 #endif 3587 3588 #ifdef PNG_READ_oFFs_SUPPORTED 3589 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3590 png_uint_32 length)) PNG_PRIVATE; 3591 #endif 3592 3593 #ifdef PNG_READ_pCAL_SUPPORTED 3594 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3595 png_uint_32 length)) PNG_PRIVATE; 3596 #endif 3597 3598 #ifdef PNG_READ_pHYs_SUPPORTED 3599 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3600 png_uint_32 length)) PNG_PRIVATE; 3601 #endif 3602 3603 #ifdef PNG_READ_sBIT_SUPPORTED 3604 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3605 png_uint_32 length)) PNG_PRIVATE; 3606 #endif 3607 3608 #ifdef PNG_READ_sCAL_SUPPORTED 3609 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3610 png_uint_32 length)) PNG_PRIVATE; 3611 #endif 3612 3613 #ifdef PNG_READ_sPLT_SUPPORTED 3614 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3615 png_uint_32 length)) PNG_PRIVATE; 3616 #endif /* PNG_READ_sPLT_SUPPORTED */ 3617 3618 #ifdef PNG_READ_sRGB_SUPPORTED 3619 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3620 png_uint_32 length)) PNG_PRIVATE; 3621 #endif 3622 3623 #ifdef PNG_READ_tEXt_SUPPORTED 3624 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3625 png_uint_32 length)) PNG_PRIVATE; 3626 #endif 3627 3628 #ifdef PNG_READ_tIME_SUPPORTED 3629 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3630 png_uint_32 length)) PNG_PRIVATE; 3631 #endif 3632 3633 #ifdef PNG_READ_tRNS_SUPPORTED 3634 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3635 png_uint_32 length)) PNG_PRIVATE; 3636 #endif 3637 3638 #ifdef PNG_READ_zTXt_SUPPORTED 3639 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3640 png_uint_32 length)) PNG_PRIVATE; 3641 #endif 3642 3643 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3644 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3645 3646 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3647 png_bytep chunk_name)) PNG_PRIVATE; 3648 3649 /* Handle the transformations for reading and writing */ 3650 PNG_EXTERN void png_do_read_transformations 3651 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3652 PNG_EXTERN void png_do_write_transformations 3653 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3654 3655 PNG_EXTERN void png_init_read_transformations 3656 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3657 3658 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3659 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3660 png_infop info_ptr)) PNG_PRIVATE; 3661 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3662 png_infop info_ptr)) PNG_PRIVATE; 3663 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3664 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3665 png_uint_32 length)) PNG_PRIVATE; 3666 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3667 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3668 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3669 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3670 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3671 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3672 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3673 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3674 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3675 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3676 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3677 png_infop info_ptr)) PNG_PRIVATE; 3678 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3679 png_infop info_ptr)) PNG_PRIVATE; 3680 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3681 png_bytep row)) PNG_PRIVATE; 3682 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3683 png_infop info_ptr)) PNG_PRIVATE; 3684 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3685 png_infop info_ptr)) PNG_PRIVATE; 3686 PNG_EXTERN void png_read_push_finish_row 3687 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3688 #ifdef PNG_READ_tEXt_SUPPORTED 3689 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3690 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3691 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3692 png_infop info_ptr)) PNG_PRIVATE; 3693 #endif 3694 #ifdef PNG_READ_zTXt_SUPPORTED 3695 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3696 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3697 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3698 png_infop info_ptr)) PNG_PRIVATE; 3699 #endif 3700 #ifdef PNG_READ_iTXt_SUPPORTED 3701 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3702 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3703 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3704 png_infop info_ptr)) PNG_PRIVATE; 3705 #endif 3706 3707 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3708 3709 #ifdef PNG_MNG_FEATURES_SUPPORTED 3710 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3711 png_bytep row)) PNG_PRIVATE; 3712 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3713 png_bytep row)) PNG_PRIVATE; 3714 #endif 3715 3716 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3717 #ifdef PNG_MMX_CODE_SUPPORTED 3718 /* png.c */ /* PRIVATE */ 3719 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3720 #endif 3721 #endif 3722 3723 3724 /* The following six functions will be exported in libpng-1.4.0. */ 3725 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3726 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3727 png_infop info_ptr)); 3728 3729 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3730 png_infop info_ptr)); 3731 3732 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3733 png_infop info_ptr)); 3734 3735 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3736 png_infop info_ptr)); 3737 3738 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3739 png_infop info_ptr)); 3740 3741 #ifdef PNG_pHYs_SUPPORTED 3742 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3743 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3744 #endif /* PNG_pHYs_SUPPORTED */ 3745 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3746 3747 /* Read the chunk header (length + type name) */ 3748 PNG_EXTERN png_uint_32 png_read_chunk_header 3749 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3750 3751 /* Added at libpng version 1.2.34 */ 3752 #ifdef PNG_cHRM_SUPPORTED 3753 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3754 png_fixed_point int_white_x, png_fixed_point int_white_y, 3755 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3756 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3757 png_fixed_point int_blue_y)) PNG_PRIVATE; 3758 #endif 3759 3760 #ifdef PNG_cHRM_SUPPORTED 3761 #ifdef PNG_CHECK_cHRM_SUPPORTED 3762 /* Added at libpng version 1.2.34 */ 3763 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3764 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3765 #endif 3766 #endif 3767 3768 /* Added at libpng version 1.2.41 */ 3769 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3770 png_uint_32 width, png_uint_32 height, int bit_depth, 3771 int color_type, int interlace_type, int compression_type, 3772 int filter_type)) PNG_PRIVATE; 3773 3774 /* Added at libpng version 1.2.41 */ 3775 PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3776 png_uint_32 size)); 3777 3778 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3779 3780 #endif /* PNG_INTERNAL */ 3781 3782 #ifdef __cplusplus 3783 } 3784 #endif 3785 3786 #endif /* PNG_VERSION_INFO_ONLY */ 3787 /* Do not put anything past this line */ 3788 #endif /* PNG_H */ 3789
