1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.45 - July 7, 2011 4 * Copyright (c) 1998-2011 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 1.2.45 - July 7, 2011: 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 * 1.0.45 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 * 1.2.45beta01-03 13 10245 12.so.0.45[.0] 266 * 1.0.55rc01 13 10055 10.so.0.55[.0] 267 * 1.2.45rc01 13 10245 12.so.0.45[.0] 268 * 1.0.55 13 10055 10.so.0.55[.0] 269 * 1.2.45 13 10245 12.so.0.45[.0] 270 * 271 * Henceforth the source version will match the shared-library major 272 * and minor numbers; the shared-library major version number will be 273 * used for changes in backward compatibility, as it is intended. The 274 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 275 * for applications, is an unsigned integer of the form xyyzz corresponding 276 * to the source version x.y.z (leading zeros in y and z). Beta versions 277 * were given the previous public release number plus a letter, until 278 * version 1.0.6j; from then on they were given the upcoming public 279 * release number plus "betaNN" or "rcNN". 280 * 281 * Binary incompatibility exists only when applications make direct access 282 * to the info_ptr or png_ptr members through png.h, and the compiled 283 * application is loaded with a different version of the library. 284 * 285 * DLLNUM will change each time there are forward or backward changes 286 * in binary compatibility (e.g., when a new feature is added). 287 * 288 * See libpng.txt or libpng.3 for more information. The PNG specification 289 * is available as a W3C Recommendation and as an ISO Specification, 290 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 291 */ 292 293 /* 294 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 295 * 296 * If you modify libpng you may insert additional notices immediately following 297 * this sentence. 298 * 299 * This code is released under the libpng license. 300 * 301 * libpng versions 1.2.6, August 15, 2004, through 1.2.45, July 7, 2011, are 302 * Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are 303 * distributed according to the same disclaimer and license as libpng-1.2.5 304 * with the following individual added to the list of Contributing Authors: 305 * 306 * Cosmin Truta 307 * 308 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 309 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 310 * distributed according to the same disclaimer and license as libpng-1.0.6 311 * with the following individuals added to the list of Contributing Authors: 312 * 313 * Simon-Pierre Cadieux 314 * Eric S. Raymond 315 * Gilles Vollant 316 * 317 * and with the following additions to the disclaimer: 318 * 319 * There is no warranty against interference with your enjoyment of the 320 * library or against infringement. There is no warranty that our 321 * efforts or the library will fulfill any of your particular purposes 322 * or needs. This library is provided with all faults, and the entire 323 * risk of satisfactory quality, performance, accuracy, and effort is with 324 * the user. 325 * 326 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 327 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 328 * distributed according to the same disclaimer and license as libpng-0.96, 329 * with the following individuals added to the list of Contributing Authors: 330 * 331 * Tom Lane 332 * Glenn Randers-Pehrson 333 * Willem van Schaik 334 * 335 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 336 * Copyright (c) 1996, 1997 Andreas Dilger 337 * Distributed according to the same disclaimer and license as libpng-0.88, 338 * with the following individuals added to the list of Contributing Authors: 339 * 340 * John Bowler 341 * Kevin Bracey 342 * Sam Bushell 343 * Magnus Holmgren 344 * Greg Roelofs 345 * Tom Tanner 346 * 347 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 348 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 349 * 350 * For the purposes of this copyright and license, "Contributing Authors" 351 * is defined as the following set of individuals: 352 * 353 * Andreas Dilger 354 * Dave Martindale 355 * Guy Eric Schalnat 356 * Paul Schmidt 357 * Tim Wegner 358 * 359 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 360 * and Group 42, Inc. disclaim all warranties, expressed or implied, 361 * including, without limitation, the warranties of merchantability and of 362 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 363 * assume no liability for direct, indirect, incidental, special, exemplary, 364 * or consequential damages, which may result from the use of the PNG 365 * Reference Library, even if advised of the possibility of such damage. 366 * 367 * Permission is hereby granted to use, copy, modify, and distribute this 368 * source code, or portions hereof, for any purpose, without fee, subject 369 * to the following restrictions: 370 * 371 * 1. The origin of this source code must not be misrepresented. 372 * 373 * 2. Altered versions must be plainly marked as such and 374 * must not be misrepresented as being the original source. 375 * 376 * 3. This Copyright notice may not be removed or altered from 377 * any source or altered source distribution. 378 * 379 * The Contributing Authors and Group 42, Inc. specifically permit, without 380 * fee, and encourage the use of this source code as a component to 381 * supporting the PNG file format in commercial products. If you use this 382 * source code in a product, acknowledgment is not required but would be 383 * appreciated. 384 */ 385 386 /* 387 * A "png_get_copyright" function is available, for convenient use in "about" 388 * boxes and the like: 389 * 390 * printf("%s",png_get_copyright(NULL)); 391 * 392 * Also, the PNG logo (in PNG format, of course) is supplied in the 393 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 394 */ 395 396 /* 397 * Libpng is OSI Certified Open Source Software. OSI Certified is a 398 * certification mark of the Open Source Initiative. 399 */ 400 401 /* 402 * The contributing authors would like to thank all those who helped 403 * with testing, bug fixes, and patience. This wouldn't have been 404 * possible without all of you. 405 * 406 * Thanks to Frank J. T. Wojcik for helping with the documentation. 407 */ 408 409 /* 410 * Y2K compliance in libpng: 411 * ========================= 412 * 413 * July 7, 2011 414 * 415 * Since the PNG Development group is an ad-hoc body, we can't make 416 * an official declaration. 417 * 418 * This is your unofficial assurance that libpng from version 0.71 and 419 * upward through 1.2.45 are Y2K compliant. It is my belief that earlier 420 * versions were also Y2K compliant. 421 * 422 * Libpng only has three year fields. One is a 2-byte unsigned integer 423 * that will hold years up to 65535. The other two hold the date in text 424 * format, and will hold years up to 9999. 425 * 426 * The integer is 427 * "png_uint_16 year" in png_time_struct. 428 * 429 * The strings are 430 * "png_charp time_buffer" in png_struct and 431 * "near_time_buffer", which is a local character string in png.c. 432 * 433 * There are seven time-related functions: 434 * png.c: png_convert_to_rfc_1123() in png.c 435 * (formerly png_convert_to_rfc_1152() in error) 436 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 437 * png_convert_from_time_t() in pngwrite.c 438 * png_get_tIME() in pngget.c 439 * png_handle_tIME() in pngrutil.c, called in pngread.c 440 * png_set_tIME() in pngset.c 441 * png_write_tIME() in pngwutil.c, called in pngwrite.c 442 * 443 * All handle dates properly in a Y2K environment. The 444 * png_convert_from_time_t() function calls gmtime() to convert from system 445 * clock time, which returns (year - 1900), which we properly convert to 446 * the full 4-digit year. There is a possibility that applications using 447 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 448 * function, or that they are incorrectly passing only a 2-digit year 449 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 450 * but this is not under our control. The libpng documentation has always 451 * stated that it works with 4-digit years, and the APIs have been 452 * documented as such. 453 * 454 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 455 * integer to hold the year, and can hold years as large as 65535. 456 * 457 * zlib, upon which libpng depends, is also Y2K compliant. It contains 458 * no date-related code. 459 * 460 * Glenn Randers-Pehrson 461 * libpng maintainer 462 * PNG Development Group 463 */ 464 465 #ifndef PNG_H 466 #define PNG_H 467 468 /* This is not the place to learn how to use libpng. The file libpng.txt 469 * describes how to use libpng, and the file example.c summarizes it 470 * with some code on which to build. This file is useful for looking 471 * at the actual function definitions and structure components. 472 */ 473 474 /* Version information for png.h - this should match the version in png.c */ 475 #define PNG_LIBPNG_VER_STRING "1.2.45" 476 #define PNG_HEADER_VERSION_STRING \ 477 " libpng version 1.2.45 - July 7, 2011\n" 478 479 #define PNG_LIBPNG_VER_SONUM 0 480 #define PNG_LIBPNG_VER_DLLNUM 13 481 482 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 483 #define PNG_LIBPNG_VER_MAJOR 1 484 #define PNG_LIBPNG_VER_MINOR 2 485 #define PNG_LIBPNG_VER_RELEASE 45 486 /* This should match the numeric part of the final component of 487 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 488 */ 489 490 #define PNG_LIBPNG_VER_BUILD 0 491 492 /* Release Status */ 493 #define PNG_LIBPNG_BUILD_ALPHA 1 494 #define PNG_LIBPNG_BUILD_BETA 2 495 #define PNG_LIBPNG_BUILD_RC 3 496 #define PNG_LIBPNG_BUILD_STABLE 4 497 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 498 499 /* Release-Specific Flags */ 500 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 501 PNG_LIBPNG_BUILD_STABLE only */ 502 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 503 PNG_LIBPNG_BUILD_SPECIAL */ 504 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 505 PNG_LIBPNG_BUILD_PRIVATE */ 506 507 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 508 509 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 510 * We must not include leading zeros. 511 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 512 * version 1.0.0 was mis-numbered 100 instead of 10000). From 513 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 514 */ 515 #define PNG_LIBPNG_VER 10245 /* 1.2.45 */ 516 517 #ifndef PNG_VERSION_INFO_ONLY 518 /* Include the compression library's header */ 519 #include "zlib.h" 520 #endif 521 522 /* Include all user configurable info, including optional assembler routines */ 523 #include "pngconf.h" 524 525 /* 526 * Added at libpng-1.2.8 */ 527 /* Ref MSDN: Private as priority over Special 528 * VS_FF_PRIVATEBUILD File *was not* built using standard release 529 * procedures. If this value is given, the StringFileInfo block must 530 * contain a PrivateBuild string. 531 * 532 * VS_FF_SPECIALBUILD File *was* built by the original company using 533 * standard release procedures but is a variation of the standard 534 * file of the same version number. If this value is given, the 535 * StringFileInfo block must contain a SpecialBuild string. 536 */ 537 538 #ifdef PNG_USER_PRIVATEBUILD 539 # define PNG_LIBPNG_BUILD_TYPE \ 540 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 541 #else 542 # ifdef PNG_LIBPNG_SPECIALBUILD 543 # define PNG_LIBPNG_BUILD_TYPE \ 544 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 545 # else 546 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 547 # endif 548 #endif 549 550 #ifndef PNG_VERSION_INFO_ONLY 551 552 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 553 #ifdef __cplusplus 554 extern "C" { 555 #endif /* __cplusplus */ 556 557 /* This file is arranged in several sections. The first section contains 558 * structure and type definitions. The second section contains the external 559 * library functions, while the third has the internal library functions, 560 * which applications aren't expected to use directly. 561 */ 562 563 #ifndef PNG_NO_TYPECAST_NULL 564 #define int_p_NULL (int *)NULL 565 #define png_bytep_NULL (png_bytep)NULL 566 #define png_bytepp_NULL (png_bytepp)NULL 567 #define png_doublep_NULL (png_doublep)NULL 568 #define png_error_ptr_NULL (png_error_ptr)NULL 569 #define png_flush_ptr_NULL (png_flush_ptr)NULL 570 #define png_free_ptr_NULL (png_free_ptr)NULL 571 #define png_infopp_NULL (png_infopp)NULL 572 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 573 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 574 #define png_rw_ptr_NULL (png_rw_ptr)NULL 575 #define png_structp_NULL (png_structp)NULL 576 #define png_uint_16p_NULL (png_uint_16p)NULL 577 #define png_voidp_NULL (png_voidp)NULL 578 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 579 #else 580 #define int_p_NULL NULL 581 #define png_bytep_NULL NULL 582 #define png_bytepp_NULL NULL 583 #define png_doublep_NULL NULL 584 #define png_error_ptr_NULL NULL 585 #define png_flush_ptr_NULL NULL 586 #define png_free_ptr_NULL NULL 587 #define png_infopp_NULL NULL 588 #define png_malloc_ptr_NULL NULL 589 #define png_read_status_ptr_NULL NULL 590 #define png_rw_ptr_NULL NULL 591 #define png_structp_NULL NULL 592 #define png_uint_16p_NULL NULL 593 #define png_voidp_NULL NULL 594 #define png_write_status_ptr_NULL NULL 595 #endif 596 597 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 598 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 599 /* Version information for C files, stored in png.c. This had better match 600 * the version above. 601 */ 602 #ifdef PNG_USE_GLOBAL_ARRAYS 603 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 604 /* Need room for 99.99.99beta99z */ 605 #else 606 #define png_libpng_ver png_get_header_ver(NULL) 607 #endif 608 609 #ifdef PNG_USE_GLOBAL_ARRAYS 610 /* This was removed in version 1.0.5c */ 611 /* Structures to facilitate easy interlacing. See png.c for more details */ 612 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 613 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 614 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 615 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 616 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 617 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 618 /* This isn't currently used. If you need it, see png.c for more details. 619 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 620 */ 621 #endif 622 623 #endif /* PNG_NO_EXTERN */ 624 625 /* Three color definitions. The order of the red, green, and blue, (and the 626 * exact size) is not important, although the size of the fields need to 627 * be png_byte or png_uint_16 (as defined below). 628 */ 629 typedef struct png_color_struct 630 { 631 png_byte red; 632 png_byte green; 633 png_byte blue; 634 } png_color; 635 typedef png_color FAR * png_colorp; 636 typedef png_color FAR * FAR * png_colorpp; 637 638 typedef struct png_color_16_struct 639 { 640 png_byte index; /* used for palette files */ 641 png_uint_16 red; /* for use in red green blue files */ 642 png_uint_16 green; 643 png_uint_16 blue; 644 png_uint_16 gray; /* for use in grayscale files */ 645 } png_color_16; 646 typedef png_color_16 FAR * png_color_16p; 647 typedef png_color_16 FAR * FAR * png_color_16pp; 648 649 typedef struct png_color_8_struct 650 { 651 png_byte red; /* for use in red green blue files */ 652 png_byte green; 653 png_byte blue; 654 png_byte gray; /* for use in grayscale files */ 655 png_byte alpha; /* for alpha channel files */ 656 } png_color_8; 657 typedef png_color_8 FAR * png_color_8p; 658 typedef png_color_8 FAR * FAR * png_color_8pp; 659 660 /* 661 * The following two structures are used for the in-core representation 662 * of sPLT chunks. 663 */ 664 typedef struct png_sPLT_entry_struct 665 { 666 png_uint_16 red; 667 png_uint_16 green; 668 png_uint_16 blue; 669 png_uint_16 alpha; 670 png_uint_16 frequency; 671 } png_sPLT_entry; 672 typedef png_sPLT_entry FAR * png_sPLT_entryp; 673 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 674 675 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 676 * occupy the LSB of their respective members, and the MSB of each member 677 * is zero-filled. The frequency member always occupies the full 16 bits. 678 */ 679 680 typedef struct png_sPLT_struct 681 { 682 png_charp name; /* palette name */ 683 png_byte depth; /* depth of palette samples */ 684 png_sPLT_entryp entries; /* palette entries */ 685 png_int_32 nentries; /* number of palette entries */ 686 } png_sPLT_t; 687 typedef png_sPLT_t FAR * png_sPLT_tp; 688 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 689 690 #ifdef PNG_TEXT_SUPPORTED 691 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 692 * and whether that contents is compressed or not. The "key" field 693 * points to a regular zero-terminated C string. The "text", "lang", and 694 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 695 * However, the * structure returned by png_get_text() will always contain 696 * regular zero-terminated C strings (possibly empty), never NULL pointers, 697 * so they can be safely used in printf() and other string-handling functions. 698 */ 699 typedef struct png_text_struct 700 { 701 int compression; /* compression value: 702 -1: tEXt, none 703 0: zTXt, deflate 704 1: iTXt, none 705 2: iTXt, deflate */ 706 png_charp key; /* keyword, 1-79 character description of "text" */ 707 png_charp text; /* comment, may be an empty string (ie "") 708 or a NULL pointer */ 709 png_size_t text_length; /* length of the text string */ 710 #ifdef PNG_iTXt_SUPPORTED 711 png_size_t itxt_length; /* length of the itxt string */ 712 png_charp lang; /* language code, 0-79 characters 713 or a NULL pointer */ 714 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 715 chars or a NULL pointer */ 716 #endif 717 } png_text; 718 typedef png_text FAR * png_textp; 719 typedef png_text FAR * FAR * png_textpp; 720 #endif 721 722 /* Supported compression types for text in PNG files (tEXt, and zTXt). 723 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 724 */ 725 #define PNG_TEXT_COMPRESSION_NONE_WR -3 726 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 727 #define PNG_TEXT_COMPRESSION_NONE -1 728 #define PNG_TEXT_COMPRESSION_zTXt 0 729 #define PNG_ITXT_COMPRESSION_NONE 1 730 #define PNG_ITXT_COMPRESSION_zTXt 2 731 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 732 733 /* png_time is a way to hold the time in an machine independent way. 734 * Two conversions are provided, both from time_t and struct tm. There 735 * is no portable way to convert to either of these structures, as far 736 * as I know. If you know of a portable way, send it to me. As a side 737 * note - PNG has always been Year 2000 compliant! 738 */ 739 typedef struct png_time_struct 740 { 741 png_uint_16 year; /* full year, as in, 1995 */ 742 png_byte month; /* month of year, 1 - 12 */ 743 png_byte day; /* day of month, 1 - 31 */ 744 png_byte hour; /* hour of day, 0 - 23 */ 745 png_byte minute; /* minute of hour, 0 - 59 */ 746 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 747 } png_time; 748 typedef png_time FAR * png_timep; 749 typedef png_time FAR * FAR * png_timepp; 750 751 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 752 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 753 /* png_unknown_chunk is a structure to hold queued chunks for which there is 754 * no specific support. The idea is that we can use this to queue 755 * up private chunks for output even though the library doesn't actually 756 * know about their semantics. 757 */ 758 #define PNG_CHUNK_NAME_LENGTH 5 759 typedef struct png_unknown_chunk_t 760 { 761 png_byte name[PNG_CHUNK_NAME_LENGTH]; 762 png_byte *data; 763 png_size_t size; 764 765 /* libpng-using applications should NOT directly modify this byte. */ 766 png_byte location; /* mode of operation at read time */ 767 } 768 png_unknown_chunk; 769 typedef png_unknown_chunk FAR * png_unknown_chunkp; 770 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 771 #endif 772 773 /* png_info is a structure that holds the information in a PNG file so 774 * that the application can find out the characteristics of the image. 775 * If you are reading the file, this structure will tell you what is 776 * in the PNG file. If you are writing the file, fill in the information 777 * you want to put into the PNG file, then call png_write_info(). 778 * The names chosen should be very close to the PNG specification, so 779 * consult that document for information about the meaning of each field. 780 * 781 * With libpng < 0.95, it was only possible to directly set and read the 782 * the values in the png_info_struct, which meant that the contents and 783 * order of the values had to remain fixed. With libpng 0.95 and later, 784 * however, there are now functions that abstract the contents of 785 * png_info_struct from the application, so this makes it easier to use 786 * libpng with dynamic libraries, and even makes it possible to use 787 * libraries that don't have all of the libpng ancillary chunk-handing 788 * functionality. 789 * 790 * In any case, the order of the parameters in png_info_struct should NOT 791 * be changed for as long as possible to keep compatibility with applications 792 * that use the old direct-access method with png_info_struct. 793 * 794 * The following members may have allocated storage attached that should be 795 * cleaned up before the structure is discarded: palette, trans, text, 796 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 797 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 798 * are automatically freed when the info structure is deallocated, if they were 799 * allocated internally by libpng. This behavior can be changed by means 800 * of the png_data_freer() function. 801 * 802 * More allocation details: all the chunk-reading functions that 803 * change these members go through the corresponding png_set_* 804 * functions. A function to clear these members is available: see 805 * png_free_data(). The png_set_* functions do not depend on being 806 * able to point info structure members to any of the storage they are 807 * passed (they make their own copies), EXCEPT that the png_set_text 808 * functions use the same storage passed to them in the text_ptr or 809 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 810 * functions do not make their own copies. 811 */ 812 typedef struct png_info_struct 813 { 814 /* The following are necessary for every PNG file */ 815 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 816 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 817 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 818 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 819 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 820 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 821 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 822 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 823 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 824 /* The following three should have been named *_method not *_type */ 825 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 826 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 827 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 828 829 /* The following is informational only on read, and not used on writes. */ 830 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 831 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 832 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 833 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 834 835 /* The rest of the data is optional. If you are reading, check the 836 * valid field to see if the information in these are valid. If you 837 * are writing, set the valid field to those chunks you want written, 838 * and initialize the appropriate fields below. 839 */ 840 841 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 842 /* The gAMA chunk describes the gamma characteristics of the system 843 * on which the image was created, normally in the range [1.0, 2.5]. 844 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 845 */ 846 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 847 #endif 848 849 #ifdef PNG_sRGB_SUPPORTED 850 /* GR-P, 0.96a */ 851 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 852 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 853 #endif 854 855 #ifdef PNG_TEXT_SUPPORTED 856 /* The tEXt, and zTXt chunks contain human-readable textual data in 857 * uncompressed, compressed, and optionally compressed forms, respectively. 858 * The data in "text" is an array of pointers to uncompressed, 859 * null-terminated C strings. Each chunk has a keyword that describes the 860 * textual data contained in that chunk. Keywords are not required to be 861 * unique, and the text string may be empty. Any number of text chunks may 862 * be in an image. 863 */ 864 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 865 int max_text PNG_DEPSTRUCT; /* current size of text array */ 866 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 867 #endif /* PNG_TEXT_SUPPORTED */ 868 869 #ifdef PNG_tIME_SUPPORTED 870 /* The tIME chunk holds the last time the displayed image data was 871 * modified. See the png_time struct for the contents of this struct. 872 */ 873 png_time mod_time PNG_DEPSTRUCT; 874 #endif 875 876 #ifdef PNG_sBIT_SUPPORTED 877 /* The sBIT chunk specifies the number of significant high-order bits 878 * in the pixel data. Values are in the range [1, bit_depth], and are 879 * only specified for the channels in the pixel data. The contents of 880 * the low-order bits is not specified. Data is valid if 881 * (valid & PNG_INFO_sBIT) is non-zero. 882 */ 883 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 884 #endif 885 886 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 887 defined(PNG_READ_BACKGROUND_SUPPORTED) 888 /* The tRNS chunk supplies transparency data for paletted images and 889 * other image types that don't need a full alpha channel. There are 890 * "num_trans" transparency values for a paletted image, stored in the 891 * same order as the palette colors, starting from index 0. Values 892 * for the data are in the range [0, 255], ranging from fully transparent 893 * to fully opaque, respectively. For non-paletted images, there is a 894 * single color specified that should be treated as fully transparent. 895 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 896 */ 897 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 898 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 899 #endif 900 901 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 902 /* The bKGD chunk gives the suggested image background color if the 903 * display program does not have its own background color and the image 904 * is needs to composited onto a background before display. The colors 905 * in "background" are normally in the same color space/depth as the 906 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 907 */ 908 png_color_16 background PNG_DEPSTRUCT; 909 #endif 910 911 #ifdef PNG_oFFs_SUPPORTED 912 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 913 * and downwards from the top-left corner of the display, page, or other 914 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 915 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 916 */ 917 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 918 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 919 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 920 #endif 921 922 #ifdef PNG_pHYs_SUPPORTED 923 /* The pHYs chunk gives the physical pixel density of the image for 924 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 925 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 926 */ 927 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 928 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 929 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 930 #endif 931 932 #ifdef PNG_hIST_SUPPORTED 933 /* The hIST chunk contains the relative frequency or importance of the 934 * various palette entries, so that a viewer can intelligently select a 935 * reduced-color palette, if required. Data is an array of "num_palette" 936 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 937 * is non-zero. 938 */ 939 png_uint_16p hist PNG_DEPSTRUCT; 940 #endif 941 942 #ifdef PNG_cHRM_SUPPORTED 943 /* The cHRM chunk describes the CIE color characteristics of the monitor 944 * on which the PNG was created. This data allows the viewer to do gamut 945 * mapping of the input image to ensure that the viewer sees the same 946 * colors in the image as the creator. Values are in the range 947 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 948 */ 949 #ifdef PNG_FLOATING_POINT_SUPPORTED 950 float x_white PNG_DEPSTRUCT; 951 float y_white PNG_DEPSTRUCT; 952 float x_red PNG_DEPSTRUCT; 953 float y_red PNG_DEPSTRUCT; 954 float x_green PNG_DEPSTRUCT; 955 float y_green PNG_DEPSTRUCT; 956 float x_blue PNG_DEPSTRUCT; 957 float y_blue PNG_DEPSTRUCT; 958 #endif 959 #endif 960 961 #ifdef PNG_pCAL_SUPPORTED 962 /* The pCAL chunk describes a transformation between the stored pixel 963 * values and original physical data values used to create the image. 964 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 965 * range given by [pcal_X0, pcal_X1], and are further transformed by a 966 * (possibly non-linear) transformation function given by "pcal_type" 967 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 968 * defines below, and the PNG-Group's PNG extensions document for a 969 * complete description of the transformations and how they should be 970 * implemented, and for a description of the ASCII parameter strings. 971 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 972 */ 973 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 974 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 975 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 976 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 977 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 978 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 979 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 980 #endif 981 982 /* New members added in libpng-1.0.6 */ 983 #ifdef PNG_FREE_ME_SUPPORTED 984 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 985 #endif 986 987 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 988 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 989 /* Storage for unknown chunks that the library doesn't recognize. */ 990 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 991 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 992 #endif 993 994 #ifdef PNG_iCCP_SUPPORTED 995 /* iCCP chunk data. */ 996 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 997 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 998 /* Note to maintainer: should be png_bytep */ 999 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 1000 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 1001 #endif 1002 1003 #ifdef PNG_sPLT_SUPPORTED 1004 /* Data on sPLT chunks (there may be more than one). */ 1005 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1006 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1007 #endif 1008 1009 #ifdef PNG_sCAL_SUPPORTED 1010 /* The sCAL chunk describes the actual physical dimensions of the 1011 * subject matter of the graphic. The chunk contains a unit specification 1012 * a byte value, and two ASCII strings representing floating-point 1013 * values. The values are width and height corresponsing to one pixel 1014 * in the image. This external representation is converted to double 1015 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1016 */ 1017 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1018 #ifdef PNG_FLOATING_POINT_SUPPORTED 1019 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1020 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1021 #endif 1022 #ifdef PNG_FIXED_POINT_SUPPORTED 1023 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1024 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1025 #endif 1026 #endif 1027 1028 #ifdef PNG_INFO_IMAGE_SUPPORTED 1029 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1030 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1031 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1032 #endif 1033 1034 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1035 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1036 #endif 1037 1038 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1039 png_fixed_point int_x_white PNG_DEPSTRUCT; 1040 png_fixed_point int_y_white PNG_DEPSTRUCT; 1041 png_fixed_point int_x_red PNG_DEPSTRUCT; 1042 png_fixed_point int_y_red PNG_DEPSTRUCT; 1043 png_fixed_point int_x_green PNG_DEPSTRUCT; 1044 png_fixed_point int_y_green PNG_DEPSTRUCT; 1045 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1046 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1047 #endif 1048 1049 } png_info; 1050 1051 typedef png_info FAR * png_infop; 1052 typedef png_info FAR * FAR * png_infopp; 1053 1054 /* Maximum positive integer used in PNG is (2^31)-1 */ 1055 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1056 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1057 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1058 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1059 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1060 #define PNG_MAX_UINT PNG_UINT_31_MAX 1061 #endif 1062 1063 /* These describe the color_type field in png_info. */ 1064 /* color type masks */ 1065 #define PNG_COLOR_MASK_PALETTE 1 1066 #define PNG_COLOR_MASK_COLOR 2 1067 #define PNG_COLOR_MASK_ALPHA 4 1068 1069 /* color types. Note that not all combinations are legal */ 1070 #define PNG_COLOR_TYPE_GRAY 0 1071 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1072 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1073 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1074 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1075 /* aliases */ 1076 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1077 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1078 1079 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1080 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1081 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1082 1083 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1084 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1085 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1086 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1087 1088 /* These are for the interlacing type. These values should NOT be changed. */ 1089 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1090 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1091 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1092 1093 /* These are for the oFFs chunk. These values should NOT be changed. */ 1094 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1095 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1096 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1097 1098 /* These are for the pCAL chunk. These values should NOT be changed. */ 1099 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1100 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1101 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1102 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1103 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1104 1105 /* These are for the sCAL chunk. These values should NOT be changed. */ 1106 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1107 #define PNG_SCALE_METER 1 /* meters per pixel */ 1108 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1109 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1110 1111 /* These are for the pHYs chunk. These values should NOT be changed. */ 1112 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1113 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1114 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1115 1116 /* These are for the sRGB chunk. These values should NOT be changed. */ 1117 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1118 #define PNG_sRGB_INTENT_RELATIVE 1 1119 #define PNG_sRGB_INTENT_SATURATION 2 1120 #define PNG_sRGB_INTENT_ABSOLUTE 3 1121 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1122 1123 /* This is for text chunks */ 1124 #define PNG_KEYWORD_MAX_LENGTH 79 1125 1126 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1127 #define PNG_MAX_PALETTE_LENGTH 256 1128 1129 /* These determine if an ancillary chunk's data has been successfully read 1130 * from the PNG header, or if the application has filled in the corresponding 1131 * data in the info_struct to be written into the output file. The values 1132 * of the PNG_INFO_<chunk> defines should NOT be changed. 1133 */ 1134 #define PNG_INFO_gAMA 0x0001 1135 #define PNG_INFO_sBIT 0x0002 1136 #define PNG_INFO_cHRM 0x0004 1137 #define PNG_INFO_PLTE 0x0008 1138 #define PNG_INFO_tRNS 0x0010 1139 #define PNG_INFO_bKGD 0x0020 1140 #define PNG_INFO_hIST 0x0040 1141 #define PNG_INFO_pHYs 0x0080 1142 #define PNG_INFO_oFFs 0x0100 1143 #define PNG_INFO_tIME 0x0200 1144 #define PNG_INFO_pCAL 0x0400 1145 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1146 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1147 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1148 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1149 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1150 1151 /* This is used for the transformation routines, as some of them 1152 * change these values for the row. It also should enable using 1153 * the routines for other purposes. 1154 */ 1155 typedef struct png_row_info_struct 1156 { 1157 png_uint_32 width; /* width of row */ 1158 png_uint_32 rowbytes; /* number of bytes in row */ 1159 png_byte color_type; /* color type of row */ 1160 png_byte bit_depth; /* bit depth of row */ 1161 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1162 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1163 } png_row_info; 1164 1165 typedef png_row_info FAR * png_row_infop; 1166 typedef png_row_info FAR * FAR * png_row_infopp; 1167 1168 /* These are the function types for the I/O functions and for the functions 1169 * that allow the user to override the default I/O functions with his or her 1170 * own. The png_error_ptr type should match that of user-supplied warning 1171 * and error functions, while the png_rw_ptr type should match that of the 1172 * user read/write data functions. 1173 */ 1174 typedef struct png_struct_def png_struct; 1175 typedef png_struct FAR * png_structp; 1176 1177 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1178 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1179 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1180 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1181 int)); 1182 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1183 int)); 1184 1185 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1186 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1187 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1188 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1189 png_uint_32, int)); 1190 #endif 1191 1192 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1193 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1194 defined(PNG_LEGACY_SUPPORTED) 1195 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1196 png_row_infop, png_bytep)); 1197 #endif 1198 1199 #ifdef PNG_USER_CHUNKS_SUPPORTED 1200 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1201 #endif 1202 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1203 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1204 #endif 1205 1206 /* Transform masks for the high-level interface */ 1207 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1208 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1209 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1210 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1211 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1212 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1213 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1214 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1215 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1216 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1217 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1218 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1219 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1220 /* Added to libpng-1.2.34 */ 1221 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1222 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1223 /* Added to libpng-1.2.41 */ 1224 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1225 1226 /* Flags for MNG supported features */ 1227 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1228 #define PNG_FLAG_MNG_FILTER_64 0x04 1229 #define PNG_ALL_MNG_FEATURES 0x05 1230 1231 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1232 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1233 1234 /* The structure that holds the information to read and write PNG files. 1235 * The only people who need to care about what is inside of this are the 1236 * people who will be modifying the library for their own special needs. 1237 * It should NOT be accessed directly by an application, except to store 1238 * the jmp_buf. 1239 */ 1240 1241 struct png_struct_def 1242 { 1243 #ifdef PNG_SETJMP_SUPPORTED 1244 jmp_buf jmpbuf; /* used in png_error */ 1245 #endif 1246 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1247 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1248 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1249 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1250 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1251 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1252 1253 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1254 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1255 #endif 1256 1257 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1258 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1259 #endif 1260 1261 /* These were added in libpng-1.0.2 */ 1262 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1263 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1264 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1265 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1266 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1267 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1268 #endif 1269 #endif 1270 1271 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1272 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1273 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1274 1275 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1276 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1277 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1278 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1279 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1280 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1281 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1282 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1283 1284 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1285 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1286 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1287 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1288 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1289 #if 0 /* Replaced with the following in libpng-1.2.43 */ 1290 png_size_t irowbytes PNG_DEPSTRUCT; 1291 #endif 1292 /* Added in libpng-1.2.43 */ 1293 #ifdef PNG_USER_LIMITS_SUPPORTED 1294 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1295 * chunks that can be stored (0 means unlimited). 1296 */ 1297 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1298 #endif 1299 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1300 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1301 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1302 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1303 #ifndef PNG_NO_WRITE_FILTER 1304 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1305 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1306 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1307 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1308 #endif 1309 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1310 1311 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1312 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1313 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1314 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1315 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1316 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1317 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1318 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1319 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1320 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1321 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1322 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1323 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1324 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1325 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1326 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1327 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1328 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1329 1330 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1331 #ifdef PNG_LEGACY_SUPPORTED 1332 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1333 #else 1334 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1335 #endif 1336 #endif 1337 1338 #ifdef PNG_bKGD_SUPPORTED 1339 png_byte background_gamma_type PNG_DEPSTRUCT; 1340 # ifdef PNG_FLOATING_POINT_SUPPORTED 1341 float background_gamma PNG_DEPSTRUCT; 1342 # endif 1343 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1344 #ifdef PNG_READ_GAMMA_SUPPORTED 1345 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1346 #endif 1347 #endif /* PNG_bKGD_SUPPORTED */ 1348 1349 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1350 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1351 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1352 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1353 #endif 1354 1355 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1356 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1357 #ifdef PNG_FLOATING_POINT_SUPPORTED 1358 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1359 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1360 #endif 1361 #endif 1362 1363 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1364 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1365 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1366 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1367 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1368 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1369 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1370 #endif 1371 1372 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1373 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1374 #endif 1375 1376 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1377 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1378 #endif 1379 1380 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1381 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1382 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1383 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1384 #endif 1385 1386 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1387 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1388 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1389 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1390 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1391 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1392 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1393 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1394 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1395 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1396 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1397 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1398 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1399 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1400 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1401 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1402 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1403 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1404 1405 # ifdef PNG_TEXT_SUPPORTED 1406 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1407 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1408 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1409 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1410 # endif /* PNG_TEXT_SUPPORTED */ 1411 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1412 1413 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1414 /* for the Borland special 64K segment handler */ 1415 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1416 png_bytep offset_table PNG_DEPSTRUCT; 1417 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1418 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1419 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1420 #endif 1421 1422 #ifdef PNG_READ_DITHER_SUPPORTED 1423 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1424 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1425 #endif 1426 1427 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1428 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1429 #endif 1430 1431 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1432 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1433 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1434 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1435 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1436 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1437 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1438 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1439 #endif 1440 1441 #ifdef PNG_TIME_RFC1123_SUPPORTED 1442 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1443 #endif 1444 1445 /* New members added in libpng-1.0.6 */ 1446 1447 #ifdef PNG_FREE_ME_SUPPORTED 1448 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1449 #endif 1450 1451 #ifdef PNG_USER_CHUNKS_SUPPORTED 1452 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1453 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1454 #endif 1455 1456 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1457 int num_chunk_list PNG_DEPSTRUCT; 1458 png_bytep chunk_list PNG_DEPSTRUCT; 1459 #endif 1460 1461 /* New members added in libpng-1.0.3 */ 1462 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1463 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1464 /* These were changed from png_byte in libpng-1.0.6 */ 1465 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1466 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1467 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1468 #endif 1469 1470 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1471 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1472 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1473 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1474 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1475 #ifdef PNG_1_0_X 1476 png_byte mng_features_permitted PNG_DEPSTRUCT; 1477 #else 1478 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1479 #endif /* PNG_1_0_X */ 1480 #endif 1481 1482 /* New member added in libpng-1.0.7 */ 1483 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1484 png_fixed_point int_gamma PNG_DEPSTRUCT; 1485 #endif 1486 1487 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1488 #ifdef PNG_MNG_FEATURES_SUPPORTED 1489 png_byte filter_type PNG_DEPSTRUCT; 1490 #endif 1491 1492 #ifdef PNG_1_0_X 1493 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1494 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1495 #endif 1496 1497 /* New members added in libpng-1.2.0 */ 1498 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1499 # ifndef PNG_1_0_X 1500 # ifdef PNG_MMX_CODE_SUPPORTED 1501 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1502 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1503 # endif 1504 png_uint_32 asm_flags PNG_DEPSTRUCT; 1505 # endif 1506 #endif 1507 1508 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1509 #ifdef PNG_USER_MEM_SUPPORTED 1510 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1511 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1512 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1513 #endif 1514 1515 /* New member added in libpng-1.0.13 and 1.2.0 */ 1516 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1517 1518 #ifdef PNG_READ_DITHER_SUPPORTED 1519 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1520 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1521 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1522 /* in the palette */ 1523 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1524 /* palette color */ 1525 #endif 1526 1527 /* New members added in libpng-1.0.16 and 1.2.6 */ 1528 png_byte compression_type PNG_DEPSTRUCT; 1529 1530 #ifdef PNG_USER_LIMITS_SUPPORTED 1531 png_uint_32 user_width_max PNG_DEPSTRUCT; 1532 png_uint_32 user_height_max PNG_DEPSTRUCT; 1533 #endif 1534 1535 /* New member added in libpng-1.0.25 and 1.2.17 */ 1536 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1537 /* Storage for unknown chunk that the library doesn't recognize. */ 1538 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1539 #endif 1540 1541 /* New members added in libpng-1.2.26 */ 1542 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1543 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1544 1545 /* New member added in libpng-1.2.30 */ 1546 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1547 1548 1549 }; 1550 1551 1552 /* This triggers a compiler error in png.c, if png.c and png.h 1553 * do not agree upon the version number. 1554 */ 1555 typedef png_structp version_1_2_45; 1556 1557 typedef png_struct FAR * FAR * png_structpp; 1558 1559 /* Here are the function definitions most commonly used. This is not 1560 * the place to find out how to use libpng. See libpng.txt for the 1561 * full explanation, see example.c for the summary. This just provides 1562 * a simple one line description of the use of each function. 1563 */ 1564 1565 /* Returns the version number of the library */ 1566 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1567 1568 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1569 * Handling more than 8 bytes from the beginning of the file is an error. 1570 */ 1571 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1572 int num_bytes)); 1573 1574 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1575 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1576 * signature, and non-zero otherwise. Having num_to_check == 0 or 1577 * start > 7 will always fail (ie return non-zero). 1578 */ 1579 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1580 png_size_t num_to_check)); 1581 1582 /* Simple signature checking function. This is the same as calling 1583 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1584 */ 1585 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1586 1587 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1588 extern PNG_EXPORT(png_structp,png_create_read_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 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1593 extern PNG_EXPORT(png_structp,png_create_write_struct) 1594 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1595 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1596 1597 #ifdef PNG_WRITE_SUPPORTED 1598 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1599 PNGARG((png_structp png_ptr)); 1600 #endif 1601 1602 #ifdef PNG_WRITE_SUPPORTED 1603 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1604 PNGARG((png_structp png_ptr, png_uint_32 size)); 1605 #endif 1606 1607 /* Reset the compression stream */ 1608 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1609 1610 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1611 #ifdef PNG_USER_MEM_SUPPORTED 1612 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1613 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1614 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1615 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1616 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1617 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1618 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1619 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1620 #endif 1621 1622 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1623 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1624 png_bytep chunk_name, png_bytep data, png_size_t length)); 1625 1626 /* Write the start of a PNG chunk - length and chunk name. */ 1627 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1628 png_bytep chunk_name, png_uint_32 length)); 1629 1630 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1631 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1632 png_bytep data, png_size_t length)); 1633 1634 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1635 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1636 1637 /* Allocate and initialize the info structure */ 1638 extern PNG_EXPORT(png_infop,png_create_info_struct) 1639 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1640 1641 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1642 /* Initialize the info structure (old interface - DEPRECATED) */ 1643 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1644 PNG_DEPRECATED; 1645 #undef png_info_init 1646 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1647 png_sizeof(png_info)); 1648 #endif 1649 1650 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1651 png_size_t png_info_struct_size)); 1652 1653 /* Writes all the PNG information before the image. */ 1654 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1655 png_infop info_ptr)); 1656 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1657 png_infop info_ptr)); 1658 1659 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1660 /* Read the information before the actual image data. */ 1661 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1662 png_infop info_ptr)); 1663 #endif 1664 1665 #ifdef PNG_TIME_RFC1123_SUPPORTED 1666 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1667 PNGARG((png_structp png_ptr, png_timep ptime)); 1668 #endif 1669 1670 #ifdef PNG_CONVERT_tIME_SUPPORTED 1671 /* Convert from a struct tm to png_time */ 1672 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1673 struct tm FAR * ttime)); 1674 1675 /* Convert from time_t to png_time. Uses gmtime() */ 1676 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1677 time_t ttime)); 1678 #endif /* PNG_CONVERT_tIME_SUPPORTED */ 1679 1680 #ifdef PNG_READ_EXPAND_SUPPORTED 1681 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1682 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1683 #ifndef PNG_1_0_X 1684 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1685 png_ptr)); 1686 #endif 1687 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1688 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1689 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1690 /* Deprecated */ 1691 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1692 png_ptr)) PNG_DEPRECATED; 1693 #endif 1694 #endif 1695 1696 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1697 /* Use blue, green, red order for pixels. */ 1698 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1699 #endif 1700 1701 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1702 /* Expand the grayscale to 24-bit RGB if necessary. */ 1703 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1704 #endif 1705 1706 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1707 /* Reduce RGB to grayscale. */ 1708 #ifdef PNG_FLOATING_POINT_SUPPORTED 1709 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1710 int error_action, double red, double green )); 1711 #endif 1712 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1713 int error_action, png_fixed_point red, png_fixed_point green )); 1714 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1715 png_ptr)); 1716 #endif 1717 1718 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1719 png_colorp palette)); 1720 1721 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1722 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1723 #endif 1724 1725 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1726 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1727 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1728 #endif 1729 1730 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1731 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1732 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1733 #endif 1734 1735 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1736 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1737 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1738 png_uint_32 filler, int flags)); 1739 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1740 #define PNG_FILLER_BEFORE 0 1741 #define PNG_FILLER_AFTER 1 1742 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1743 #ifndef PNG_1_0_X 1744 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1745 png_uint_32 filler, int flags)); 1746 #endif 1747 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1748 1749 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1750 /* Swap bytes in 16-bit depth files. */ 1751 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1752 #endif 1753 1754 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1755 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1756 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1757 #endif 1758 1759 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1760 /* Swap packing order of pixels in bytes. */ 1761 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1762 #endif 1763 1764 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1765 /* Converts files to legal bit depths. */ 1766 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1767 png_color_8p true_bits)); 1768 #endif 1769 1770 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1771 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1772 /* Have the code handle the interlacing. Returns the number of passes. */ 1773 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1774 #endif 1775 1776 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1777 /* Invert monochrome files */ 1778 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1779 #endif 1780 1781 #ifdef PNG_READ_BACKGROUND_SUPPORTED 1782 /* Handle alpha and tRNS by replacing with a background color. */ 1783 #ifdef PNG_FLOATING_POINT_SUPPORTED 1784 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1785 png_color_16p background_color, int background_gamma_code, 1786 int need_expand, double background_gamma)); 1787 #endif 1788 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1789 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1790 #define PNG_BACKGROUND_GAMMA_FILE 2 1791 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1792 #endif 1793 1794 #ifdef PNG_READ_16_TO_8_SUPPORTED 1795 /* Strip the second byte of information from a 16-bit depth file. */ 1796 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1797 #endif 1798 1799 #ifdef PNG_READ_DITHER_SUPPORTED 1800 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1801 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1802 png_colorp palette, int num_palette, int maximum_colors, 1803 png_uint_16p histogram, int full_dither)); 1804 #endif 1805 1806 #ifdef PNG_READ_GAMMA_SUPPORTED 1807 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1808 #ifdef PNG_FLOATING_POINT_SUPPORTED 1809 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1810 double screen_gamma, double default_file_gamma)); 1811 #endif 1812 #endif 1813 1814 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1815 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1816 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1817 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1818 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1819 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1820 int empty_plte_permitted)) PNG_DEPRECATED; 1821 #endif 1822 #endif 1823 1824 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1825 /* Set how many lines between output flushes - 0 for no flushing */ 1826 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1827 /* Flush the current PNG output buffer */ 1828 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1829 #endif 1830 1831 /* Optional update palette with requested transformations */ 1832 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1833 1834 /* Optional call to update the users info structure */ 1835 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1836 png_infop info_ptr)); 1837 1838 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1839 /* Read one or more rows of image data. */ 1840 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1841 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1842 #endif 1843 1844 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1845 /* Read a row of data. */ 1846 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1847 png_bytep row, 1848 png_bytep display_row)); 1849 #endif 1850 1851 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1852 /* Read the whole image into memory at once. */ 1853 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1854 png_bytepp image)); 1855 #endif 1856 1857 /* Write a row of image data */ 1858 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1859 png_bytep row)); 1860 1861 /* Write a few rows of image data */ 1862 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1863 png_bytepp row, png_uint_32 num_rows)); 1864 1865 /* Write the image data */ 1866 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1867 png_bytepp image)); 1868 1869 /* Writes the end of the PNG file. */ 1870 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1871 png_infop info_ptr)); 1872 1873 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1874 /* Read the end of the PNG file. */ 1875 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1876 png_infop info_ptr)); 1877 #endif 1878 1879 /* Free any memory associated with the png_info_struct */ 1880 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1881 png_infopp info_ptr_ptr)); 1882 1883 /* Free any memory associated with the png_struct and the png_info_structs */ 1884 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1885 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1886 1887 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1888 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1889 png_infop end_info_ptr)) PNG_DEPRECATED; 1890 1891 /* Free any memory associated with the png_struct and the png_info_structs */ 1892 extern PNG_EXPORT(void,png_destroy_write_struct) 1893 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1894 1895 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1896 extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1897 1898 /* Set the libpng method of handling chunk CRC errors */ 1899 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1900 int crit_action, int ancil_action)); 1901 1902 /* Values for png_set_crc_action() to say how to handle CRC errors in 1903 * ancillary and critical chunks, and whether to use the data contained 1904 * therein. Note that it is impossible to "discard" data in a critical 1905 * chunk. For versions prior to 0.90, the action was always error/quit, 1906 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1907 * chunks is warn/discard. These values should NOT be changed. 1908 * 1909 * value action:critical action:ancillary 1910 */ 1911 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1912 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1913 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1914 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1915 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1916 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1917 1918 /* These functions give the user control over the scan-line filtering in 1919 * libpng and the compression methods used by zlib. These functions are 1920 * mainly useful for testing, as the defaults should work with most users. 1921 * Those users who are tight on memory or want faster performance at the 1922 * expense of compression can modify them. See the compression library 1923 * header file (zlib.h) for an explination of the compression functions. 1924 */ 1925 1926 /* Set the filtering method(s) used by libpng. Currently, the only valid 1927 * value for "method" is 0. 1928 */ 1929 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1930 int filters)); 1931 1932 /* Flags for png_set_filter() to say which filters to use. The flags 1933 * are chosen so that they don't conflict with real filter types 1934 * below, in case they are supplied instead of the #defined constants. 1935 * These values should NOT be changed. 1936 */ 1937 #define PNG_NO_FILTERS 0x00 1938 #define PNG_FILTER_NONE 0x08 1939 #define PNG_FILTER_SUB 0x10 1940 #define PNG_FILTER_UP 0x20 1941 #define PNG_FILTER_AVG 0x40 1942 #define PNG_FILTER_PAETH 0x80 1943 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1944 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1945 1946 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1947 * These defines should NOT be changed. 1948 */ 1949 #define PNG_FILTER_VALUE_NONE 0 1950 #define PNG_FILTER_VALUE_SUB 1 1951 #define PNG_FILTER_VALUE_UP 2 1952 #define PNG_FILTER_VALUE_AVG 3 1953 #define PNG_FILTER_VALUE_PAETH 4 1954 #define PNG_FILTER_VALUE_LAST 5 1955 1956 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1957 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1958 * defines, either the default (minimum-sum-of-absolute-differences), or 1959 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1960 * 1961 * Weights are factors >= 1.0, indicating how important it is to keep the 1962 * filter type consistent between rows. Larger numbers mean the current 1963 * filter is that many times as likely to be the same as the "num_weights" 1964 * previous filters. This is cumulative for each previous row with a weight. 1965 * There needs to be "num_weights" values in "filter_weights", or it can be 1966 * NULL if the weights aren't being specified. Weights have no influence on 1967 * the selection of the first row filter. Well chosen weights can (in theory) 1968 * improve the compression for a given image. 1969 * 1970 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1971 * filter type. Higher costs indicate more decoding expense, and are 1972 * therefore less likely to be selected over a filter with lower computational 1973 * costs. There needs to be a value in "filter_costs" for each valid filter 1974 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1975 * setting the costs. Costs try to improve the speed of decompression without 1976 * unduly increasing the compressed image size. 1977 * 1978 * A negative weight or cost indicates the default value is to be used, and 1979 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1980 * The default values for both weights and costs are currently 1.0, but may 1981 * change if good general weighting/cost heuristics can be found. If both 1982 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1983 * to the UNWEIGHTED method, but with added encoding time/computation. 1984 */ 1985 #ifdef PNG_FLOATING_POINT_SUPPORTED 1986 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1987 int heuristic_method, int num_weights, png_doublep filter_weights, 1988 png_doublep filter_costs)); 1989 #endif 1990 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1991 1992 /* Heuristic used for row filter selection. These defines should NOT be 1993 * changed. 1994 */ 1995 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1996 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1997 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1998 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1999 2000 /* Set the library compression level. Currently, valid values range from 2001 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2002 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2003 * shown that zlib compression levels 3-6 usually perform as well as level 9 2004 * for PNG images, and do considerably fewer caclulations. In the future, 2005 * these values may not correspond directly to the zlib compression levels. 2006 */ 2007 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2008 int level)); 2009 2010 extern PNG_EXPORT(void,png_set_compression_mem_level) 2011 PNGARG((png_structp png_ptr, int mem_level)); 2012 2013 extern PNG_EXPORT(void,png_set_compression_strategy) 2014 PNGARG((png_structp png_ptr, int strategy)); 2015 2016 extern PNG_EXPORT(void,png_set_compression_window_bits) 2017 PNGARG((png_structp png_ptr, int window_bits)); 2018 2019 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2020 int method)); 2021 2022 /* These next functions are called for input/output, memory, and error 2023 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2024 * and call standard C I/O routines such as fread(), fwrite(), and 2025 * fprintf(). These functions can be made to use other I/O routines 2026 * at run time for those applications that need to handle I/O in a 2027 * different manner by calling png_set_???_fn(). See libpng.txt for 2028 * more information. 2029 */ 2030 2031 #ifdef PNG_STDIO_SUPPORTED 2032 /* Initialize the input/output for the PNG file to the default functions. */ 2033 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2034 #endif 2035 2036 /* Replace the (error and abort), and warning functions with user 2037 * supplied functions. If no messages are to be printed you must still 2038 * write and use replacement functions. The replacement error_fn should 2039 * still do a longjmp to the last setjmp location if you are using this 2040 * method of error handling. If error_fn or warning_fn is NULL, the 2041 * default function will be used. 2042 */ 2043 2044 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2045 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2046 2047 /* Return the user pointer associated with the error functions */ 2048 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2049 2050 /* Replace the default data output functions with a user supplied one(s). 2051 * If buffered output is not used, then output_flush_fn can be set to NULL. 2052 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2053 * output_flush_fn will be ignored (and thus can be NULL). 2054 * It is probably a mistake to use NULL for output_flush_fn if 2055 * write_data_fn is not also NULL unless you have built libpng with 2056 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2057 * default flush function, which uses the standard *FILE structure, will 2058 * be used. 2059 */ 2060 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2061 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2062 2063 /* Replace the default data input function with a user supplied one. */ 2064 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2065 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2066 2067 /* Return the user pointer associated with the I/O functions */ 2068 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2069 2070 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2071 png_read_status_ptr read_row_fn)); 2072 2073 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2074 png_write_status_ptr write_row_fn)); 2075 2076 #ifdef PNG_USER_MEM_SUPPORTED 2077 /* Replace the default memory allocation functions with user supplied one(s). */ 2078 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2079 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2080 /* Return the user pointer associated with the memory functions */ 2081 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2082 #endif 2083 2084 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2085 defined(PNG_LEGACY_SUPPORTED) 2086 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2087 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2088 #endif 2089 2090 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2091 defined(PNG_LEGACY_SUPPORTED) 2092 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2093 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2094 #endif 2095 2096 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2097 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2098 defined(PNG_LEGACY_SUPPORTED) 2099 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2100 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2101 int user_transform_channels)); 2102 /* Return the user pointer associated with the user transform functions */ 2103 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2104 PNGARG((png_structp png_ptr)); 2105 #endif 2106 2107 #ifdef PNG_USER_CHUNKS_SUPPORTED 2108 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2109 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2110 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2111 png_ptr)); 2112 #endif 2113 2114 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2115 /* Sets the function callbacks for the push reader, and a pointer to a 2116 * user-defined structure available to the callback functions. 2117 */ 2118 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2119 png_voidp progressive_ptr, 2120 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2121 png_progressive_end_ptr end_fn)); 2122 2123 /* Returns the user pointer associated with the push read functions */ 2124 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2125 PNGARG((png_structp png_ptr)); 2126 2127 /* Function to be called when data becomes available */ 2128 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2129 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2130 2131 /* Function that combines rows. Not very much different than the 2132 * png_combine_row() call. Is this even used????? 2133 */ 2134 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2135 png_bytep old_row, png_bytep new_row)); 2136 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2137 2138 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2139 png_uint_32 size)) PNG_ALLOCATED; 2140 2141 #ifdef PNG_1_0_X 2142 # define png_malloc_warn png_malloc 2143 #else 2144 /* Added at libpng version 1.2.4 */ 2145 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2146 png_uint_32 size)) PNG_ALLOCATED; 2147 #endif 2148 2149 /* Frees a pointer allocated by png_malloc() */ 2150 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2151 2152 #ifdef PNG_1_0_X 2153 /* Function to allocate memory for zlib. */ 2154 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2155 uInt size)); 2156 2157 /* Function to free memory for zlib */ 2158 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2159 #endif 2160 2161 /* Free data that was allocated internally */ 2162 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2163 png_infop info_ptr, png_uint_32 free_me, int num)); 2164 #ifdef PNG_FREE_ME_SUPPORTED 2165 /* Reassign responsibility for freeing existing data, whether allocated 2166 * by libpng or by the application 2167 */ 2168 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2169 png_infop info_ptr, int freer, png_uint_32 mask)); 2170 #endif 2171 /* Assignments for png_data_freer */ 2172 #define PNG_DESTROY_WILL_FREE_DATA 1 2173 #define PNG_SET_WILL_FREE_DATA 1 2174 #define PNG_USER_WILL_FREE_DATA 2 2175 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2176 #define PNG_FREE_HIST 0x0008 2177 #define PNG_FREE_ICCP 0x0010 2178 #define PNG_FREE_SPLT 0x0020 2179 #define PNG_FREE_ROWS 0x0040 2180 #define PNG_FREE_PCAL 0x0080 2181 #define PNG_FREE_SCAL 0x0100 2182 #define PNG_FREE_UNKN 0x0200 2183 #define PNG_FREE_LIST 0x0400 2184 #define PNG_FREE_PLTE 0x1000 2185 #define PNG_FREE_TRNS 0x2000 2186 #define PNG_FREE_TEXT 0x4000 2187 #define PNG_FREE_ALL 0x7fff 2188 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2189 2190 #ifdef PNG_USER_MEM_SUPPORTED 2191 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2192 png_uint_32 size)) PNG_ALLOCATED; 2193 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2194 png_voidp ptr)); 2195 #endif 2196 2197 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2198 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2199 2200 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2201 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2202 2203 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2204 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2205 int check)); 2206 #endif /* USE_FAR_KEYWORD */ 2207 2208 #ifndef PNG_NO_ERROR_TEXT 2209 /* Fatal error in PNG image of libpng - can't continue */ 2210 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2211 png_const_charp error_message)) PNG_NORETURN; 2212 2213 /* The same, but the chunk name is prepended to the error string. */ 2214 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2215 png_const_charp error_message)) PNG_NORETURN; 2216 #else 2217 /* Fatal error in PNG image of libpng - can't continue */ 2218 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2219 #endif 2220 2221 #ifndef PNG_NO_WARNINGS 2222 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2223 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2224 png_const_charp warning_message)); 2225 2226 #ifdef PNG_READ_SUPPORTED 2227 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2228 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2229 png_const_charp warning_message)); 2230 #endif /* PNG_READ_SUPPORTED */ 2231 #endif /* PNG_NO_WARNINGS */ 2232 2233 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2234 * Similarly, the png_get_<chunk> calls are used to read values from the 2235 * png_info_struct, either storing the parameters in the passed variables, or 2236 * setting pointers into the png_info_struct where the data is stored. The 2237 * png_get_<chunk> functions return a non-zero value if the data was available 2238 * in info_ptr, or return zero and do not change any of the parameters if the 2239 * data was not available. 2240 * 2241 * These functions should be used instead of directly accessing png_info 2242 * to avoid problems with future changes in the size and internal layout of 2243 * png_info_struct. 2244 */ 2245 /* Returns "flag" if chunk data is valid in info_ptr. */ 2246 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2247 png_infop info_ptr, png_uint_32 flag)); 2248 2249 /* Returns number of bytes needed to hold a transformed row. */ 2250 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2251 png_infop info_ptr)); 2252 2253 #ifdef PNG_INFO_IMAGE_SUPPORTED 2254 /* Returns row_pointers, which is an array of pointers to scanlines that was 2255 * returned from png_read_png(). 2256 */ 2257 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2258 png_infop info_ptr)); 2259 /* Set row_pointers, which is an array of pointers to scanlines for use 2260 * by png_write_png(). 2261 */ 2262 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2263 png_infop info_ptr, png_bytepp row_pointers)); 2264 #endif 2265 2266 /* Returns number of color channels in image. */ 2267 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2268 png_infop info_ptr)); 2269 2270 #ifdef PNG_EASY_ACCESS_SUPPORTED 2271 /* Returns image width in pixels. */ 2272 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2273 png_ptr, png_infop info_ptr)); 2274 2275 /* Returns image height in pixels. */ 2276 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2277 png_ptr, png_infop info_ptr)); 2278 2279 /* Returns image bit_depth. */ 2280 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2281 png_ptr, png_infop info_ptr)); 2282 2283 /* Returns image color_type. */ 2284 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2285 png_ptr, png_infop info_ptr)); 2286 2287 /* Returns image filter_type. */ 2288 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2289 png_ptr, png_infop info_ptr)); 2290 2291 /* Returns image interlace_type. */ 2292 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2293 png_ptr, png_infop info_ptr)); 2294 2295 /* Returns image compression_type. */ 2296 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2297 png_ptr, png_infop info_ptr)); 2298 2299 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2300 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2301 png_ptr, png_infop info_ptr)); 2302 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2303 png_ptr, png_infop info_ptr)); 2304 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2305 png_ptr, png_infop info_ptr)); 2306 2307 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2308 #ifdef PNG_FLOATING_POINT_SUPPORTED 2309 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2310 png_ptr, png_infop info_ptr)); 2311 #endif 2312 2313 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2314 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2315 png_ptr, png_infop info_ptr)); 2316 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2317 png_ptr, png_infop info_ptr)); 2318 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2319 png_ptr, png_infop info_ptr)); 2320 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2321 png_ptr, png_infop info_ptr)); 2322 2323 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2324 2325 /* Returns pointer to signature string read from PNG header */ 2326 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2327 png_infop info_ptr)); 2328 2329 #ifdef PNG_bKGD_SUPPORTED 2330 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2331 png_infop info_ptr, png_color_16p *background)); 2332 #endif 2333 2334 #ifdef PNG_bKGD_SUPPORTED 2335 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2336 png_infop info_ptr, png_color_16p background)); 2337 #endif 2338 2339 #ifdef PNG_cHRM_SUPPORTED 2340 #ifdef PNG_FLOATING_POINT_SUPPORTED 2341 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2342 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2343 double *red_y, double *green_x, double *green_y, double *blue_x, 2344 double *blue_y)); 2345 #endif 2346 #ifdef PNG_FIXED_POINT_SUPPORTED 2347 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2348 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2349 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2350 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2351 *int_blue_x, png_fixed_point *int_blue_y)); 2352 #endif 2353 #endif 2354 2355 #ifdef PNG_cHRM_SUPPORTED 2356 #ifdef PNG_FLOATING_POINT_SUPPORTED 2357 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2358 png_infop info_ptr, double white_x, double white_y, double red_x, 2359 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2360 #endif 2361 #ifdef PNG_FIXED_POINT_SUPPORTED 2362 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2363 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2364 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2365 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2366 png_fixed_point int_blue_y)); 2367 #endif 2368 #endif 2369 2370 #ifdef PNG_gAMA_SUPPORTED 2371 #ifdef PNG_FLOATING_POINT_SUPPORTED 2372 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2373 png_infop info_ptr, double *file_gamma)); 2374 #endif 2375 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2376 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2377 #endif 2378 2379 #ifdef PNG_gAMA_SUPPORTED 2380 #ifdef PNG_FLOATING_POINT_SUPPORTED 2381 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2382 png_infop info_ptr, double file_gamma)); 2383 #endif 2384 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2385 png_infop info_ptr, png_fixed_point int_file_gamma)); 2386 #endif 2387 2388 #ifdef PNG_hIST_SUPPORTED 2389 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2390 png_infop info_ptr, png_uint_16p *hist)); 2391 #endif 2392 2393 #ifdef PNG_hIST_SUPPORTED 2394 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2395 png_infop info_ptr, png_uint_16p hist)); 2396 #endif 2397 2398 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2399 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2400 int *bit_depth, int *color_type, int *interlace_method, 2401 int *compression_method, int *filter_method)); 2402 2403 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2404 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2405 int color_type, int interlace_method, int compression_method, 2406 int filter_method)); 2407 2408 #ifdef PNG_oFFs_SUPPORTED 2409 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2410 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2411 int *unit_type)); 2412 #endif 2413 2414 #ifdef PNG_oFFs_SUPPORTED 2415 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2416 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2417 int unit_type)); 2418 #endif 2419 2420 #ifdef PNG_pCAL_SUPPORTED 2421 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2422 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2423 int *type, int *nparams, png_charp *units, png_charpp *params)); 2424 #endif 2425 2426 #ifdef PNG_pCAL_SUPPORTED 2427 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2428 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2429 int type, int nparams, png_charp units, png_charpp params)); 2430 #endif 2431 2432 #ifdef PNG_pHYs_SUPPORTED 2433 extern PNG_EXPORT(png_uint_32,png_get_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 #ifdef PNG_pHYs_SUPPORTED 2438 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2439 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2440 #endif 2441 2442 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2443 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2444 2445 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2446 png_infop info_ptr, png_colorp palette, int num_palette)); 2447 2448 #ifdef PNG_sBIT_SUPPORTED 2449 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2450 png_infop info_ptr, png_color_8p *sig_bit)); 2451 #endif 2452 2453 #ifdef PNG_sBIT_SUPPORTED 2454 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2455 png_infop info_ptr, png_color_8p sig_bit)); 2456 #endif 2457 2458 #ifdef PNG_sRGB_SUPPORTED 2459 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2460 png_infop info_ptr, int *intent)); 2461 #endif 2462 2463 #ifdef PNG_sRGB_SUPPORTED 2464 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2465 png_infop info_ptr, int intent)); 2466 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2467 png_infop info_ptr, int intent)); 2468 #endif 2469 2470 #ifdef PNG_iCCP_SUPPORTED 2471 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2472 png_infop info_ptr, png_charpp name, int *compression_type, 2473 png_charpp profile, png_uint_32 *proflen)); 2474 /* Note to maintainer: profile should be png_bytepp */ 2475 #endif 2476 2477 #ifdef PNG_iCCP_SUPPORTED 2478 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2479 png_infop info_ptr, png_charp name, int compression_type, 2480 png_charp profile, png_uint_32 proflen)); 2481 /* Note to maintainer: profile should be png_bytep */ 2482 #endif 2483 2484 #ifdef PNG_sPLT_SUPPORTED 2485 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2486 png_infop info_ptr, png_sPLT_tpp entries)); 2487 #endif 2488 2489 #ifdef PNG_sPLT_SUPPORTED 2490 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2491 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2492 #endif 2493 2494 #ifdef PNG_TEXT_SUPPORTED 2495 /* png_get_text also returns the number of text chunks in *num_text */ 2496 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2497 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2498 #endif 2499 2500 /* 2501 * Note while png_set_text() will accept a structure whose text, 2502 * language, and translated keywords are NULL pointers, the structure 2503 * returned by png_get_text will always contain regular 2504 * zero-terminated C strings. They might be empty strings but 2505 * they will never be NULL pointers. 2506 */ 2507 2508 #ifdef PNG_TEXT_SUPPORTED 2509 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2510 png_infop info_ptr, png_textp text_ptr, int num_text)); 2511 #endif 2512 2513 #ifdef PNG_tIME_SUPPORTED 2514 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2515 png_infop info_ptr, png_timep *mod_time)); 2516 #endif 2517 2518 #ifdef PNG_tIME_SUPPORTED 2519 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2520 png_infop info_ptr, png_timep mod_time)); 2521 #endif 2522 2523 #ifdef PNG_tRNS_SUPPORTED 2524 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2525 png_infop info_ptr, png_bytep *trans, int *num_trans, 2526 png_color_16p *trans_values)); 2527 #endif 2528 2529 #ifdef PNG_tRNS_SUPPORTED 2530 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2531 png_infop info_ptr, png_bytep trans, int num_trans, 2532 png_color_16p trans_values)); 2533 #endif 2534 2535 #ifdef PNG_tRNS_SUPPORTED 2536 #endif 2537 2538 #ifdef PNG_sCAL_SUPPORTED 2539 #ifdef PNG_FLOATING_POINT_SUPPORTED 2540 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2541 png_infop info_ptr, int *unit, double *width, double *height)); 2542 #else 2543 #ifdef PNG_FIXED_POINT_SUPPORTED 2544 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2545 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2546 #endif 2547 #endif 2548 #endif /* PNG_sCAL_SUPPORTED */ 2549 2550 #ifdef PNG_sCAL_SUPPORTED 2551 #ifdef PNG_FLOATING_POINT_SUPPORTED 2552 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2553 png_infop info_ptr, int unit, double width, double height)); 2554 #else 2555 #ifdef PNG_FIXED_POINT_SUPPORTED 2556 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2557 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2558 #endif 2559 #endif 2560 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2561 2562 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2563 /* Provide a list of chunks and how they are to be handled, if the built-in 2564 handling or default unknown chunk handling is not desired. Any chunks not 2565 listed will be handled in the default manner. The IHDR and IEND chunks 2566 must not be listed. 2567 keep = 0: follow default behaviour 2568 = 1: do not keep 2569 = 2: keep only if safe-to-copy 2570 = 3: keep even if unsafe-to-copy 2571 */ 2572 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2573 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2574 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2575 chunk_name)); 2576 #endif 2577 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2578 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2579 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2580 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2581 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2582 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2583 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2584 #endif 2585 2586 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2587 * If you need to turn it off for a chunk that your application has freed, 2588 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2589 */ 2590 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2591 png_infop info_ptr, int mask)); 2592 2593 #ifdef PNG_INFO_IMAGE_SUPPORTED 2594 /* The "params" pointer is currently not used and is for future expansion. */ 2595 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2596 png_infop info_ptr, 2597 int transforms, 2598 png_voidp params)); 2599 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2600 png_infop info_ptr, 2601 int transforms, 2602 png_voidp params)); 2603 #endif 2604 2605 /* Define PNG_DEBUG at compile time for debugging information. Higher 2606 * numbers for PNG_DEBUG mean more debugging information. This has 2607 * only been added since version 0.95 so it is not implemented throughout 2608 * libpng yet, but more support will be added as needed. 2609 */ 2610 #ifdef PNG_DEBUG 2611 #if (PNG_DEBUG > 0) 2612 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2613 #include <crtdbg.h> 2614 #if (PNG_DEBUG > 1) 2615 #ifndef _DEBUG 2616 # define _DEBUG 2617 #endif 2618 #ifndef png_debug 2619 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2620 #endif 2621 #ifndef png_debug1 2622 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2623 #endif 2624 #ifndef png_debug2 2625 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2626 #endif 2627 #endif 2628 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2629 #ifndef PNG_DEBUG_FILE 2630 #define PNG_DEBUG_FILE stderr 2631 #endif /* PNG_DEBUG_FILE */ 2632 2633 #if (PNG_DEBUG > 1) 2634 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2635 * compilers. 2636 */ 2637 # ifdef __STDC__ 2638 # ifndef png_debug 2639 # define png_debug(l,m) \ 2640 { \ 2641 int num_tabs=l; \ 2642 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2643 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2644 } 2645 # endif 2646 # ifndef png_debug1 2647 # define png_debug1(l,m,p1) \ 2648 { \ 2649 int num_tabs=l; \ 2650 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2651 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2652 } 2653 # endif 2654 # ifndef png_debug2 2655 # define png_debug2(l,m,p1,p2) \ 2656 { \ 2657 int num_tabs=l; \ 2658 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2659 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2660 } 2661 # endif 2662 # else /* __STDC __ */ 2663 # ifndef png_debug 2664 # define png_debug(l,m) \ 2665 { \ 2666 int num_tabs=l; \ 2667 char format[256]; \ 2668 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2669 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2670 m,PNG_STRING_NEWLINE); \ 2671 fprintf(PNG_DEBUG_FILE,format); \ 2672 } 2673 # endif 2674 # ifndef png_debug1 2675 # define png_debug1(l,m,p1) \ 2676 { \ 2677 int num_tabs=l; \ 2678 char format[256]; \ 2679 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2680 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2681 m,PNG_STRING_NEWLINE); \ 2682 fprintf(PNG_DEBUG_FILE,format,p1); \ 2683 } 2684 # endif 2685 # ifndef png_debug2 2686 # define png_debug2(l,m,p1,p2) \ 2687 { \ 2688 int num_tabs=l; \ 2689 char format[256]; \ 2690 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2691 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2692 m,PNG_STRING_NEWLINE); \ 2693 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2694 } 2695 # endif 2696 # endif /* __STDC __ */ 2697 #endif /* (PNG_DEBUG > 1) */ 2698 2699 #endif /* _MSC_VER */ 2700 #endif /* (PNG_DEBUG > 0) */ 2701 #endif /* PNG_DEBUG */ 2702 #ifndef png_debug 2703 #define png_debug(l, m) 2704 #endif 2705 #ifndef png_debug1 2706 #define png_debug1(l, m, p1) 2707 #endif 2708 #ifndef png_debug2 2709 #define png_debug2(l, m, p1, p2) 2710 #endif 2711 2712 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2713 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2714 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2715 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2716 2717 #ifdef PNG_MNG_FEATURES_SUPPORTED 2718 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2719 png_ptr, png_uint_32 mng_features_permitted)); 2720 #endif 2721 2722 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2723 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2724 #define PNG_HANDLE_CHUNK_NEVER 1 2725 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2726 #define PNG_HANDLE_CHUNK_ALWAYS 3 2727 2728 /* Added to version 1.2.0 */ 2729 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2730 #ifdef PNG_MMX_CODE_SUPPORTED 2731 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2732 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2733 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2734 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2735 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2736 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2737 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2738 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2739 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2740 2741 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2742 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2743 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2744 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2745 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2746 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2747 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2748 2749 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2750 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2751 | PNG_MMX_READ_FLAGS \ 2752 | PNG_MMX_WRITE_FLAGS ) 2753 2754 #define PNG_SELECT_READ 1 2755 #define PNG_SELECT_WRITE 2 2756 #endif /* PNG_MMX_CODE_SUPPORTED */ 2757 2758 #ifndef PNG_1_0_X 2759 /* pngget.c */ 2760 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2761 PNGARG((int flag_select, int *compilerID)); 2762 2763 /* pngget.c */ 2764 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2765 PNGARG((int flag_select)); 2766 2767 /* pngget.c */ 2768 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2769 PNGARG((png_structp png_ptr)); 2770 2771 /* pngget.c */ 2772 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2773 PNGARG((png_structp png_ptr)); 2774 2775 /* pngget.c */ 2776 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2777 PNGARG((png_structp png_ptr)); 2778 2779 /* pngset.c */ 2780 extern PNG_EXPORT(void,png_set_asm_flags) 2781 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2782 2783 /* pngset.c */ 2784 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2785 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2786 png_uint_32 mmx_rowbytes_threshold)); 2787 2788 #endif /* PNG_1_0_X */ 2789 2790 #ifndef PNG_1_0_X 2791 /* png.c, pnggccrd.c, or pngvcrd.c */ 2792 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2793 #endif /* PNG_1_0_X */ 2794 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2795 2796 /* Strip the prepended error numbers ("#nnn ") from error and warning 2797 * messages before passing them to the error or warning handler. 2798 */ 2799 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2800 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2801 png_ptr, png_uint_32 strip_mode)); 2802 #endif 2803 2804 /* Added at libpng-1.2.6 */ 2805 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2806 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2807 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2808 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2809 png_ptr)); 2810 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2811 png_ptr)); 2812 #endif 2813 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2814 * project defs 2815 */ 2816 2817 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2818 /* With these routines we avoid an integer divide, which will be slower on 2819 * most machines. However, it does take more operations than the corresponding 2820 * divide method, so it may be slower on a few RISC systems. There are two 2821 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2822 * 2823 * Note that the rounding factors are NOT supposed to be the same! 128 and 2824 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2825 * standard method. 2826 * 2827 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2828 */ 2829 2830 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2831 2832 # define png_composite(composite, fg, alpha, bg) \ 2833 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2834 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2835 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2836 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2837 2838 # define png_composite_16(composite, fg, alpha, bg) \ 2839 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2840 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2841 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2842 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2843 2844 #else /* Standard method using integer division */ 2845 2846 # define png_composite(composite, fg, alpha, bg) \ 2847 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2848 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2849 (png_uint_16)127) / 255) 2850 2851 # define png_composite_16(composite, fg, alpha, bg) \ 2852 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2853 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2854 (png_uint_32)32767) / (png_uint_32)65535L) 2855 2856 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2857 2858 /* Inline macros to do direct reads of bytes from the input buffer. These 2859 * require that you are using an architecture that uses PNG byte ordering 2860 * (MSB first) and supports unaligned data storage. I think that PowerPC 2861 * in big-endian mode and 680x0 are the only ones that will support this. 2862 * The x86 line of processors definitely do not. The png_get_int_32() 2863 * routine also assumes we are using two's complement format for negative 2864 * values, which is almost certainly true. 2865 */ 2866 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2867 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2868 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2869 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2870 #else 2871 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2872 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2873 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2874 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2875 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2876 PNGARG((png_structp png_ptr, png_bytep buf)); 2877 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2878 2879 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2880 */ 2881 extern PNG_EXPORT(void,png_save_uint_32) 2882 PNGARG((png_bytep buf, png_uint_32 i)); 2883 extern PNG_EXPORT(void,png_save_int_32) 2884 PNGARG((png_bytep buf, png_int_32 i)); 2885 2886 /* Place a 16-bit number into a buffer in PNG byte order. 2887 * The parameter is declared unsigned int, not png_uint_16, 2888 * just to avoid potential problems on pre-ANSI C compilers. 2889 */ 2890 extern PNG_EXPORT(void,png_save_uint_16) 2891 PNGARG((png_bytep buf, unsigned int i)); 2892 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2893 2894 /* ************************************************************************* */ 2895 2896 /* These next functions are used internally in the code. They generally 2897 * shouldn't be used unless you are writing code to add or replace some 2898 * functionality in libpng. More information about most functions can 2899 * be found in the files where the functions are located. 2900 */ 2901 2902 2903 /* Various modes of operation, that are visible to applications because 2904 * they are used for unknown chunk location. 2905 */ 2906 #define PNG_HAVE_IHDR 0x01 2907 #define PNG_HAVE_PLTE 0x02 2908 #define PNG_HAVE_IDAT 0x04 2909 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2910 #define PNG_HAVE_IEND 0x10 2911 2912 #ifdef PNG_INTERNAL 2913 2914 /* More modes of operation. Note that after an init, mode is set to 2915 * zero automatically when the structure is created. 2916 */ 2917 #define PNG_HAVE_gAMA 0x20 2918 #define PNG_HAVE_cHRM 0x40 2919 #define PNG_HAVE_sRGB 0x80 2920 #define PNG_HAVE_CHUNK_HEADER 0x100 2921 #define PNG_WROTE_tIME 0x200 2922 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2923 #define PNG_BACKGROUND_IS_GRAY 0x800 2924 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2925 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2926 2927 /* Flags for the transformations the PNG library does on the image data */ 2928 #define PNG_BGR 0x0001 2929 #define PNG_INTERLACE 0x0002 2930 #define PNG_PACK 0x0004 2931 #define PNG_SHIFT 0x0008 2932 #define PNG_SWAP_BYTES 0x0010 2933 #define PNG_INVERT_MONO 0x0020 2934 #define PNG_DITHER 0x0040 2935 #define PNG_BACKGROUND 0x0080 2936 #define PNG_BACKGROUND_EXPAND 0x0100 2937 /* 0x0200 unused */ 2938 #define PNG_16_TO_8 0x0400 2939 #define PNG_RGBA 0x0800 2940 #define PNG_EXPAND 0x1000 2941 #define PNG_GAMMA 0x2000 2942 #define PNG_GRAY_TO_RGB 0x4000 2943 #define PNG_FILLER 0x8000L 2944 #define PNG_PACKSWAP 0x10000L 2945 #define PNG_SWAP_ALPHA 0x20000L 2946 #define PNG_STRIP_ALPHA 0x40000L 2947 #define PNG_INVERT_ALPHA 0x80000L 2948 #define PNG_USER_TRANSFORM 0x100000L 2949 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2950 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2951 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2952 /* 0x800000L Unused */ 2953 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2954 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2955 #define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 2956 /* by volker */ 2957 /* 0x8000000L unused */ 2958 /* 0x10000000L unused */ 2959 /* 0x20000000L unused */ 2960 /* 0x40000000L unused */ 2961 2962 /* Flags for png_create_struct */ 2963 #define PNG_STRUCT_PNG 0x0001 2964 #define PNG_STRUCT_INFO 0x0002 2965 2966 /* Scaling factor for filter heuristic weighting calculations */ 2967 #define PNG_WEIGHT_SHIFT 8 2968 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2969 #define PNG_COST_SHIFT 3 2970 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2971 2972 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2973 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2974 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2975 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2976 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2977 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2978 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2979 #define PNG_FLAG_ROW_INIT 0x0040 2980 #define PNG_FLAG_FILLER_AFTER 0x0080 2981 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2982 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2983 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2984 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2985 #define PNG_FLAG_FREE_PLTE 0x1000 2986 #define PNG_FLAG_FREE_TRNS 0x2000 2987 #define PNG_FLAG_FREE_HIST 0x4000 2988 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2989 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2990 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2991 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2992 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2993 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2994 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2995 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2996 /* 0x800000L unused */ 2997 /* 0x1000000L unused */ 2998 /* 0x2000000L unused */ 2999 /* 0x4000000L unused */ 3000 /* 0x8000000L unused */ 3001 /* 0x10000000L unused */ 3002 /* 0x20000000L unused */ 3003 /* 0x40000000L unused */ 3004 3005 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3006 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3007 3008 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3009 PNG_FLAG_CRC_CRITICAL_IGNORE) 3010 3011 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3012 PNG_FLAG_CRC_CRITICAL_MASK) 3013 3014 /* Save typing and make code easier to understand */ 3015 3016 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3017 abs((int)((c1).green) - (int)((c2).green)) + \ 3018 abs((int)((c1).blue) - (int)((c2).blue))) 3019 3020 /* Added to libpng-1.2.6 JB */ 3021 #define PNG_ROWBYTES(pixel_bits, width) \ 3022 ((pixel_bits) >= 8 ? \ 3023 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3024 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3025 3026 /* PNG_OUT_OF_RANGE returns true if value is outside the range 3027 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3028 * "ideal" and "delta" should be constants, normally simple 3029 * integers, "value" a variable. Added to libpng-1.2.6 JB 3030 */ 3031 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3032 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3033 3034 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3035 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3036 /* Place to hold the signature string for a PNG file. */ 3037 #ifdef PNG_USE_GLOBAL_ARRAYS 3038 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3039 #else 3040 #endif 3041 #endif /* PNG_NO_EXTERN */ 3042 3043 /* Constant strings for known chunk types. If you need to add a chunk, 3044 * define the name here, and add an invocation of the macro in png.c and 3045 * wherever it's needed. 3046 */ 3047 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3048 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3049 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3050 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3051 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3052 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3053 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3054 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3055 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3056 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3057 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3058 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3059 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3060 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3061 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3062 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3063 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3064 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3065 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3066 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3067 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3068 3069 #ifdef PNG_USE_GLOBAL_ARRAYS 3070 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3071 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3072 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3073 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3074 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3075 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3076 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3077 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3078 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3079 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3080 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3081 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3082 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3083 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3084 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3085 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3086 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3087 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3088 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3089 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3090 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3091 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3092 3093 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3094 /* Initialize png_ptr struct for reading, and allocate any other memory. 3095 * (old interface - DEPRECATED - use png_create_read_struct instead). 3096 */ 3097 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3098 PNG_DEPRECATED; 3099 #undef png_read_init 3100 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3101 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3102 #endif 3103 3104 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3105 png_const_charp user_png_ver, png_size_t png_struct_size)); 3106 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3107 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3108 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3109 png_info_size)); 3110 #endif 3111 3112 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3113 /* Initialize png_ptr struct for writing, and allocate any other memory. 3114 * (old interface - DEPRECATED - use png_create_write_struct instead). 3115 */ 3116 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3117 PNG_DEPRECATED; 3118 #undef png_write_init 3119 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3120 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3121 #endif 3122 3123 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3124 png_const_charp user_png_ver, png_size_t png_struct_size)); 3125 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3126 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3127 png_info_size)); 3128 3129 /* Allocate memory for an internal libpng struct */ 3130 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3131 3132 /* Free memory from internal libpng struct */ 3133 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3134 3135 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3136 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3137 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3138 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3139 3140 /* Free any memory that info_ptr points to and reset struct. */ 3141 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3142 png_infop info_ptr)) PNG_PRIVATE; 3143 3144 #ifndef PNG_1_0_X 3145 /* Function to allocate memory for zlib. */ 3146 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3147 uInt size)) PNG_PRIVATE; 3148 3149 /* Function to free memory for zlib */ 3150 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3151 3152 #ifdef PNG_SIZE_T 3153 /* Function to convert a sizeof an item to png_sizeof item */ 3154 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3155 PNG_PRIVATE; 3156 #endif 3157 3158 /* Next four functions are used internally as callbacks. PNGAPI is required 3159 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3160 */ 3161 3162 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3163 png_bytep data, png_size_t length)) PNG_PRIVATE; 3164 3165 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3166 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3167 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3168 #endif 3169 3170 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3171 png_bytep data, png_size_t length)) PNG_PRIVATE; 3172 3173 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3174 #ifdef PNG_STDIO_SUPPORTED 3175 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3176 PNG_PRIVATE; 3177 #endif 3178 #endif 3179 #else /* PNG_1_0_X */ 3180 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3181 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3182 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3183 #endif 3184 #endif /* PNG_1_0_X */ 3185 3186 /* Reset the CRC variable */ 3187 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3188 3189 /* Write the "data" buffer to whatever output you are using. */ 3190 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3191 png_size_t length)) PNG_PRIVATE; 3192 3193 /* Read data from whatever input you are using into the "data" buffer */ 3194 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3195 png_size_t length)) PNG_PRIVATE; 3196 3197 /* Read bytes into buf, and update png_ptr->crc */ 3198 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3199 png_size_t length)) PNG_PRIVATE; 3200 3201 /* Decompress data in a chunk that uses compression */ 3202 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3203 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3204 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3205 int comp_type, png_size_t chunklength, 3206 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3207 #endif 3208 3209 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3210 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3211 PNG_PRIVATE); 3212 3213 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3214 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3215 3216 /* Calculate the CRC over a section of data. Note that we are only 3217 * passing a maximum of 64K on systems that have this as a memory limit, 3218 * since this is the maximum buffer size we can specify. 3219 */ 3220 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3221 png_size_t length)) PNG_PRIVATE; 3222 3223 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3224 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3225 #endif 3226 3227 /* Simple function to write the signature */ 3228 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3229 3230 /* Write various chunks */ 3231 3232 /* Write the IHDR chunk, and update the png_struct with the necessary 3233 * information. 3234 */ 3235 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3236 png_uint_32 height, 3237 int bit_depth, int color_type, int compression_method, int filter_method, 3238 int interlace_method)) PNG_PRIVATE; 3239 3240 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3241 png_uint_32 num_pal)) PNG_PRIVATE; 3242 3243 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3244 png_size_t length)) PNG_PRIVATE; 3245 3246 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3247 3248 #ifdef PNG_WRITE_gAMA_SUPPORTED 3249 #ifdef PNG_FLOATING_POINT_SUPPORTED 3250 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3251 PNG_PRIVATE; 3252 #endif 3253 #ifdef PNG_FIXED_POINT_SUPPORTED 3254 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3255 png_fixed_point file_gamma)) PNG_PRIVATE; 3256 #endif 3257 #endif 3258 3259 #ifdef PNG_WRITE_sBIT_SUPPORTED 3260 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3261 int color_type)) PNG_PRIVATE; 3262 #endif 3263 3264 #ifdef PNG_WRITE_cHRM_SUPPORTED 3265 #ifdef PNG_FLOATING_POINT_SUPPORTED 3266 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3267 double white_x, double white_y, 3268 double red_x, double red_y, double green_x, double green_y, 3269 double blue_x, double blue_y)) PNG_PRIVATE; 3270 #endif 3271 #ifdef PNG_FIXED_POINT_SUPPORTED 3272 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3273 png_fixed_point int_white_x, png_fixed_point int_white_y, 3274 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3275 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3276 png_fixed_point int_blue_y)) PNG_PRIVATE; 3277 #endif 3278 #endif 3279 3280 #ifdef PNG_WRITE_sRGB_SUPPORTED 3281 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3282 int intent)) PNG_PRIVATE; 3283 #endif 3284 3285 #ifdef PNG_WRITE_iCCP_SUPPORTED 3286 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3287 png_charp name, int compression_type, 3288 png_charp profile, int proflen)) PNG_PRIVATE; 3289 /* Note to maintainer: profile should be png_bytep */ 3290 #endif 3291 3292 #ifdef PNG_WRITE_sPLT_SUPPORTED 3293 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3294 png_sPLT_tp palette)) PNG_PRIVATE; 3295 #endif 3296 3297 #ifdef PNG_WRITE_tRNS_SUPPORTED 3298 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3299 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3300 #endif 3301 3302 #ifdef PNG_WRITE_bKGD_SUPPORTED 3303 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3304 png_color_16p values, int color_type)) PNG_PRIVATE; 3305 #endif 3306 3307 #ifdef PNG_WRITE_hIST_SUPPORTED 3308 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3309 int num_hist)) PNG_PRIVATE; 3310 #endif 3311 3312 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3313 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3314 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3315 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3316 #endif 3317 3318 #ifdef PNG_WRITE_tEXt_SUPPORTED 3319 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3320 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3321 #endif 3322 3323 #ifdef PNG_WRITE_zTXt_SUPPORTED 3324 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3325 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3326 #endif 3327 3328 #ifdef PNG_WRITE_iTXt_SUPPORTED 3329 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3330 int compression, png_charp key, png_charp lang, png_charp lang_key, 3331 png_charp text)) PNG_PRIVATE; 3332 #endif 3333 3334 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3335 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3336 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3337 #endif 3338 3339 #ifdef PNG_WRITE_oFFs_SUPPORTED 3340 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3341 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3342 #endif 3343 3344 #ifdef PNG_WRITE_pCAL_SUPPORTED 3345 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3346 png_int_32 X0, png_int_32 X1, int type, int nparams, 3347 png_charp units, png_charpp params)) PNG_PRIVATE; 3348 #endif 3349 3350 #ifdef PNG_WRITE_pHYs_SUPPORTED 3351 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3352 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3353 int unit_type)) PNG_PRIVATE; 3354 #endif 3355 3356 #ifdef PNG_WRITE_tIME_SUPPORTED 3357 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3358 png_timep mod_time)) PNG_PRIVATE; 3359 #endif 3360 3361 #ifdef PNG_WRITE_sCAL_SUPPORTED 3362 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3363 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3364 int unit, double width, double height)) PNG_PRIVATE; 3365 #else 3366 #ifdef PNG_FIXED_POINT_SUPPORTED 3367 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3368 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3369 #endif 3370 #endif 3371 #endif 3372 3373 /* Called when finished processing a row of data */ 3374 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3375 3376 /* Internal use only. Called before first row of data */ 3377 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3378 3379 #ifdef PNG_READ_GAMMA_SUPPORTED 3380 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3381 #endif 3382 3383 /* Combine a row of data, dealing with alpha, etc. if requested */ 3384 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3385 int mask)) PNG_PRIVATE; 3386 3387 #ifdef PNG_READ_INTERLACING_SUPPORTED 3388 /* Expand an interlaced row */ 3389 /* OLD pre-1.0.9 interface: 3390 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3391 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3392 */ 3393 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3394 #endif 3395 3396 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3397 3398 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 3399 /* Grab pixels out of a row for an interlaced pass */ 3400 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3401 png_bytep row, int pass)) PNG_PRIVATE; 3402 #endif 3403 3404 /* Unfilter a row */ 3405 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3406 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3407 int filter)) PNG_PRIVATE; 3408 3409 /* Choose the best filter to use and filter the row data */ 3410 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3411 png_row_infop row_info)) PNG_PRIVATE; 3412 3413 /* Write out the filtered row. */ 3414 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3415 png_bytep filtered_row)) PNG_PRIVATE; 3416 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3417 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3418 3419 /* Initialize the row buffers, etc. */ 3420 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3421 /* Optional call to update the users info structure */ 3422 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3423 png_infop info_ptr)) PNG_PRIVATE; 3424 3425 /* These are the functions that do the transformations */ 3426 #ifdef PNG_READ_FILLER_SUPPORTED 3427 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3428 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3429 #endif 3430 3431 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3432 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3433 png_bytep row)) PNG_PRIVATE; 3434 #endif 3435 3436 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3437 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3438 png_bytep row)) PNG_PRIVATE; 3439 #endif 3440 3441 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3442 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3443 png_bytep row)) PNG_PRIVATE; 3444 #endif 3445 3446 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3447 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3448 png_bytep row)) PNG_PRIVATE; 3449 #endif 3450 3451 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3452 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3453 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3454 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3455 #endif 3456 3457 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3458 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3459 png_bytep row)) PNG_PRIVATE; 3460 #endif 3461 3462 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3463 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3464 png_bytep row)) PNG_PRIVATE; 3465 #endif 3466 3467 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3468 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3469 row_info, png_bytep row)) PNG_PRIVATE; 3470 #endif 3471 3472 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3473 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3474 png_bytep row)) PNG_PRIVATE; 3475 #endif 3476 3477 #ifdef PNG_READ_PACK_SUPPORTED 3478 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3479 png_bytep row)) PNG_PRIVATE; 3480 #endif 3481 3482 #ifdef PNG_READ_SHIFT_SUPPORTED 3483 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3484 png_color_8p sig_bits)) PNG_PRIVATE; 3485 #endif 3486 3487 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3488 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3489 png_bytep row)) PNG_PRIVATE; 3490 #endif 3491 3492 #ifdef PNG_READ_16_TO_8_SUPPORTED 3493 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3494 png_bytep row)) PNG_PRIVATE; 3495 #endif 3496 3497 #ifdef PNG_READ_DITHER_SUPPORTED 3498 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3499 png_bytep row, png_bytep palette_lookup, 3500 png_bytep dither_lookup)) PNG_PRIVATE; 3501 3502 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 3503 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3504 png_colorp palette, int num_palette)) PNG_PRIVATE; 3505 # endif 3506 #endif 3507 3508 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3509 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3510 png_bytep row)) PNG_PRIVATE; 3511 #endif 3512 3513 #ifdef PNG_WRITE_PACK_SUPPORTED 3514 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3515 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3516 #endif 3517 3518 #ifdef PNG_WRITE_SHIFT_SUPPORTED 3519 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3520 png_color_8p bit_depth)) PNG_PRIVATE; 3521 #endif 3522 3523 #ifdef PNG_READ_BACKGROUND_SUPPORTED 3524 #ifdef PNG_READ_GAMMA_SUPPORTED 3525 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3526 png_color_16p trans_values, png_color_16p background, 3527 png_color_16p background_1, 3528 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3529 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3530 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3531 #else 3532 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3533 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3534 #endif 3535 #endif 3536 3537 #ifdef PNG_READ_GAMMA_SUPPORTED 3538 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3539 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3540 int gamma_shift)) PNG_PRIVATE; 3541 #endif 3542 3543 #ifdef PNG_READ_EXPAND_SUPPORTED 3544 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3545 png_bytep row, png_colorp palette, png_bytep trans, 3546 int num_trans)) PNG_PRIVATE; 3547 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3548 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3549 #endif 3550 3551 /* The following decodes the appropriate chunks, and does error correction, 3552 * then calls the appropriate callback for the chunk if it is valid. 3553 */ 3554 3555 /* Decode the IHDR chunk */ 3556 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3557 png_uint_32 length)) PNG_PRIVATE; 3558 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3559 png_uint_32 length)); 3560 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3561 png_uint_32 length)); 3562 3563 #ifdef PNG_READ_bKGD_SUPPORTED 3564 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3565 png_uint_32 length)) PNG_PRIVATE; 3566 #endif 3567 3568 #ifdef PNG_READ_cHRM_SUPPORTED 3569 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3570 png_uint_32 length)) PNG_PRIVATE; 3571 #endif 3572 3573 #ifdef PNG_READ_gAMA_SUPPORTED 3574 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3575 png_uint_32 length)) PNG_PRIVATE; 3576 #endif 3577 3578 #ifdef PNG_READ_hIST_SUPPORTED 3579 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3580 png_uint_32 length)) PNG_PRIVATE; 3581 #endif 3582 3583 #ifdef PNG_READ_iCCP_SUPPORTED 3584 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3585 png_uint_32 length)); 3586 #endif /* PNG_READ_iCCP_SUPPORTED */ 3587 3588 #ifdef PNG_READ_iTXt_SUPPORTED 3589 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3590 png_uint_32 length)) PNG_PRIVATE; 3591 #endif 3592 3593 #ifdef PNG_READ_oFFs_SUPPORTED 3594 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3595 png_uint_32 length)) PNG_PRIVATE; 3596 #endif 3597 3598 #ifdef PNG_READ_pCAL_SUPPORTED 3599 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3600 png_uint_32 length)) PNG_PRIVATE; 3601 #endif 3602 3603 #ifdef PNG_READ_pHYs_SUPPORTED 3604 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3605 png_uint_32 length)) PNG_PRIVATE; 3606 #endif 3607 3608 #ifdef PNG_READ_sBIT_SUPPORTED 3609 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3610 png_uint_32 length)) PNG_PRIVATE; 3611 #endif 3612 3613 #ifdef PNG_READ_sCAL_SUPPORTED 3614 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3615 png_uint_32 length)) PNG_PRIVATE; 3616 #endif 3617 3618 #ifdef PNG_READ_sPLT_SUPPORTED 3619 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3620 png_uint_32 length)) PNG_PRIVATE; 3621 #endif /* PNG_READ_sPLT_SUPPORTED */ 3622 3623 #ifdef PNG_READ_sRGB_SUPPORTED 3624 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3625 png_uint_32 length)) PNG_PRIVATE; 3626 #endif 3627 3628 #ifdef PNG_READ_tEXt_SUPPORTED 3629 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3630 png_uint_32 length)) PNG_PRIVATE; 3631 #endif 3632 3633 #ifdef PNG_READ_tIME_SUPPORTED 3634 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3635 png_uint_32 length)) PNG_PRIVATE; 3636 #endif 3637 3638 #ifdef PNG_READ_tRNS_SUPPORTED 3639 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3640 png_uint_32 length)) PNG_PRIVATE; 3641 #endif 3642 3643 #ifdef PNG_READ_zTXt_SUPPORTED 3644 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3645 png_uint_32 length)) PNG_PRIVATE; 3646 #endif 3647 3648 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3649 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3650 3651 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3652 png_bytep chunk_name)) PNG_PRIVATE; 3653 3654 /* Handle the transformations for reading and writing */ 3655 PNG_EXTERN void png_do_read_transformations 3656 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3657 PNG_EXTERN void png_do_write_transformations 3658 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3659 3660 PNG_EXTERN void png_init_read_transformations 3661 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3662 3663 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3664 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3665 png_infop info_ptr)) PNG_PRIVATE; 3666 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3667 png_infop info_ptr)) PNG_PRIVATE; 3668 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3669 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3670 png_uint_32 length)) PNG_PRIVATE; 3671 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3672 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3673 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3674 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3675 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3676 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3677 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3678 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3679 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3680 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3681 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3682 png_infop info_ptr)) PNG_PRIVATE; 3683 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3684 png_infop info_ptr)) PNG_PRIVATE; 3685 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3686 png_bytep row)) PNG_PRIVATE; 3687 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3688 png_infop info_ptr)) PNG_PRIVATE; 3689 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3690 png_infop info_ptr)) PNG_PRIVATE; 3691 PNG_EXTERN void png_read_push_finish_row 3692 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3693 #ifdef PNG_READ_tEXt_SUPPORTED 3694 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3695 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3696 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3697 png_infop info_ptr)) PNG_PRIVATE; 3698 #endif 3699 #ifdef PNG_READ_zTXt_SUPPORTED 3700 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3701 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3702 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3703 png_infop info_ptr)) PNG_PRIVATE; 3704 #endif 3705 #ifdef PNG_READ_iTXt_SUPPORTED 3706 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3707 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3708 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3709 png_infop info_ptr)) PNG_PRIVATE; 3710 #endif 3711 3712 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3713 3714 #ifdef PNG_MNG_FEATURES_SUPPORTED 3715 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3716 png_bytep row)) PNG_PRIVATE; 3717 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3718 png_bytep row)) PNG_PRIVATE; 3719 #endif 3720 3721 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3722 #ifdef PNG_MMX_CODE_SUPPORTED 3723 /* png.c */ /* PRIVATE */ 3724 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3725 #endif 3726 #endif 3727 3728 3729 /* The following six functions will be exported in libpng-1.4.0. */ 3730 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3731 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3732 png_infop info_ptr)); 3733 3734 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3735 png_infop info_ptr)); 3736 3737 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3738 png_infop info_ptr)); 3739 3740 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3741 png_infop info_ptr)); 3742 3743 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3744 png_infop info_ptr)); 3745 3746 #ifdef PNG_pHYs_SUPPORTED 3747 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3748 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3749 #endif /* PNG_pHYs_SUPPORTED */ 3750 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3751 3752 /* Read the chunk header (length + type name) */ 3753 PNG_EXTERN png_uint_32 png_read_chunk_header 3754 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3755 3756 /* Added at libpng version 1.2.34 */ 3757 #ifdef PNG_cHRM_SUPPORTED 3758 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3759 png_fixed_point int_white_x, png_fixed_point int_white_y, 3760 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3761 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3762 png_fixed_point int_blue_y)) PNG_PRIVATE; 3763 #endif 3764 3765 #ifdef PNG_cHRM_SUPPORTED 3766 #ifdef PNG_CHECK_cHRM_SUPPORTED 3767 /* Added at libpng version 1.2.34 */ 3768 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3769 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3770 #endif 3771 #endif 3772 3773 /* Added at libpng version 1.2.41 */ 3774 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3775 png_uint_32 width, png_uint_32 height, int bit_depth, 3776 int color_type, int interlace_type, int compression_type, 3777 int filter_type)) PNG_PRIVATE; 3778 3779 /* Added at libpng version 1.2.41 */ 3780 PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3781 png_uint_32 size)); 3782 3783 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3784 3785 #endif /* PNG_INTERNAL */ 3786 3787 #ifdef __cplusplus 3788 } 3789 #endif 3790 3791 #endif /* PNG_VERSION_INFO_ONLY */ 3792 /* Do not put anything past this line */ 3793 #endif /* PNG_H */ 3794
