1/* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.50 - July 10, 2012 4 * Copyright (c) 1998-2012 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 1.2.50 - July 10, 2012: 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 10 10055 10.so.0.55[.0] 267 * 1.2.45rc01 13 10245 12.so.0.45[.0] 268 * 1.0.55 10 10055 10.so.0.55[.0] 269 * 1.2.45 13 10245 12.so.0.45[.0] 270 * 1.2.46rc01-02 13 10246 12.so.0.46[.0] 271 * 1.0.56 10 10056 10.so.0.56[.0] 272 * 1.2.46 13 10246 12.so.0.46[.0] 273 * 1.2.47beta01 13 10247 12.so.0.47[.0] 274 * 1.2.47rc01 13 10247 12.so.0.47[.0] 275 * 1.0.57rc01 10 10057 10.so.0.57[.0] 276 * 1.2.47 13 10247 12.so.0.47[.0] 277 * 1.0.57 10 10057 10.so.0.57[.0] 278 * 1.2.48beta01 13 10248 12.so.0.48[.0] 279 * 1.2.48rc01-02 13 10248 12.so.0.48[.0] 280 * 1.0.58 10 10058 10.so.0.58[.0] 281 * 1.2.48 13 10248 12.so.0.48[.0] 282 * 1.2.49rc01 13 10249 12.so.0.49[.0] 283 * 1.0.59 10 10059 10.so.0.59[.0] 284 * 1.2.49 13 10249 12.so.0.49[.0] 285 * 1.0.60 10 10060 10.so.0.60[.0] 286 * 1.2.50 13 10250 12.so.0.50[.0] 287 * 288 * Henceforth the source version will match the shared-library major 289 * and minor numbers; the shared-library major version number will be 290 * used for changes in backward compatibility, as it is intended. The 291 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 292 * for applications, is an unsigned integer of the form xyyzz corresponding 293 * to the source version x.y.z (leading zeros in y and z). Beta versions 294 * were given the previous public release number plus a letter, until 295 * version 1.0.6j; from then on they were given the upcoming public 296 * release number plus "betaNN" or "rcNN". 297 * 298 * Binary incompatibility exists only when applications make direct access 299 * to the info_ptr or png_ptr members through png.h, and the compiled 300 * application is loaded with a different version of the library. 301 * 302 * DLLNUM will change each time there are forward or backward changes 303 * in binary compatibility (e.g., when a new feature is added). 304 * 305 * See libpng.txt or libpng.3 for more information. The PNG specification 306 * is available as a W3C Recommendation and as an ISO Specification, 307 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 308 */ 309 310/* 311 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 312 * 313 * If you modify libpng you may insert additional notices immediately following 314 * this sentence. 315 * 316 * This code is released under the libpng license. 317 * 318 * libpng versions 1.2.6, August 15, 2004, through 1.2.50, July 10, 2012, are 319 * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are 320 * distributed according to the same disclaimer and license as libpng-1.2.5 321 * with the following individual added to the list of Contributing Authors: 322 * 323 * Cosmin Truta 324 * 325 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 326 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 327 * distributed according to the same disclaimer and license as libpng-1.0.6 328 * with the following individuals added to the list of Contributing Authors: 329 * 330 * Simon-Pierre Cadieux 331 * Eric S. Raymond 332 * Gilles Vollant 333 * 334 * and with the following additions to the disclaimer: 335 * 336 * There is no warranty against interference with your enjoyment of the 337 * library or against infringement. There is no warranty that our 338 * efforts or the library will fulfill any of your particular purposes 339 * or needs. This library is provided with all faults, and the entire 340 * risk of satisfactory quality, performance, accuracy, and effort is with 341 * the user. 342 * 343 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 344 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 345 * distributed according to the same disclaimer and license as libpng-0.96, 346 * with the following individuals added to the list of Contributing Authors: 347 * 348 * Tom Lane 349 * Glenn Randers-Pehrson 350 * Willem van Schaik 351 * 352 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 353 * Copyright (c) 1996, 1997 Andreas Dilger 354 * Distributed according to the same disclaimer and license as libpng-0.88, 355 * with the following individuals added to the list of Contributing Authors: 356 * 357 * John Bowler 358 * Kevin Bracey 359 * Sam Bushell 360 * Magnus Holmgren 361 * Greg Roelofs 362 * Tom Tanner 363 * 364 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 365 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 366 * 367 * For the purposes of this copyright and license, "Contributing Authors" 368 * is defined as the following set of individuals: 369 * 370 * Andreas Dilger 371 * Dave Martindale 372 * Guy Eric Schalnat 373 * Paul Schmidt 374 * Tim Wegner 375 * 376 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 377 * and Group 42, Inc. disclaim all warranties, expressed or implied, 378 * including, without limitation, the warranties of merchantability and of 379 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 380 * assume no liability for direct, indirect, incidental, special, exemplary, 381 * or consequential damages, which may result from the use of the PNG 382 * Reference Library, even if advised of the possibility of such damage. 383 * 384 * Permission is hereby granted to use, copy, modify, and distribute this 385 * source code, or portions hereof, for any purpose, without fee, subject 386 * to the following restrictions: 387 * 388 * 1. The origin of this source code must not be misrepresented. 389 * 390 * 2. Altered versions must be plainly marked as such and 391 * must not be misrepresented as being the original source. 392 * 393 * 3. This Copyright notice may not be removed or altered from 394 * any source or altered source distribution. 395 * 396 * The Contributing Authors and Group 42, Inc. specifically permit, without 397 * fee, and encourage the use of this source code as a component to 398 * supporting the PNG file format in commercial products. If you use this 399 * source code in a product, acknowledgment is not required but would be 400 * appreciated. 401 */ 402 403/* 404 * A "png_get_copyright" function is available, for convenient use in "about" 405 * boxes and the like: 406 * 407 * printf("%s",png_get_copyright(NULL)); 408 * 409 * Also, the PNG logo (in PNG format, of course) is supplied in the 410 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 411 */ 412 413/* 414 * Libpng is OSI Certified Open Source Software. OSI Certified is a 415 * certification mark of the Open Source Initiative. 416 */ 417 418/* 419 * The contributing authors would like to thank all those who helped 420 * with testing, bug fixes, and patience. This wouldn't have been 421 * possible without all of you. 422 * 423 * Thanks to Frank J. T. Wojcik for helping with the documentation. 424 */ 425 426/* 427 * Y2K compliance in libpng: 428 * ========================= 429 * 430 * July 10, 2012 431 * 432 * Since the PNG Development group is an ad-hoc body, we can't make 433 * an official declaration. 434 * 435 * This is your unofficial assurance that libpng from version 0.71 and 436 * upward through 1.2.50 are Y2K compliant. It is my belief that earlier 437 * versions were also Y2K compliant. 438 * 439 * Libpng only has three year fields. One is a 2-byte unsigned integer 440 * that will hold years up to 65535. The other two hold the date in text 441 * format, and will hold years up to 9999. 442 * 443 * The integer is 444 * "png_uint_16 year" in png_time_struct. 445 * 446 * The strings are 447 * "png_charp time_buffer" in png_struct and 448 * "near_time_buffer", which is a local character string in png.c. 449 * 450 * There are seven time-related functions: 451 * png.c: png_convert_to_rfc_1123() in png.c 452 * (formerly png_convert_to_rfc_1152() in error) 453 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 454 * png_convert_from_time_t() in pngwrite.c 455 * png_get_tIME() in pngget.c 456 * png_handle_tIME() in pngrutil.c, called in pngread.c 457 * png_set_tIME() in pngset.c 458 * png_write_tIME() in pngwutil.c, called in pngwrite.c 459 * 460 * All handle dates properly in a Y2K environment. The 461 * png_convert_from_time_t() function calls gmtime() to convert from system 462 * clock time, which returns (year - 1900), which we properly convert to 463 * the full 4-digit year. There is a possibility that applications using 464 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 465 * function, or that they are incorrectly passing only a 2-digit year 466 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 467 * but this is not under our control. The libpng documentation has always 468 * stated that it works with 4-digit years, and the APIs have been 469 * documented as such. 470 * 471 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 472 * integer to hold the year, and can hold years as large as 65535. 473 * 474 * zlib, upon which libpng depends, is also Y2K compliant. It contains 475 * no date-related code. 476 * 477 * Glenn Randers-Pehrson 478 * libpng maintainer 479 * PNG Development Group 480 */ 481 482#ifndef PNG_H 483#define PNG_H 484 485/* This is not the place to learn how to use libpng. The file libpng.txt 486 * describes how to use libpng, and the file example.c summarizes it 487 * with some code on which to build. This file is useful for looking 488 * at the actual function definitions and structure components. 489 */ 490 491/* Version information for png.h - this should match the version in png.c */ 492#define PNG_LIBPNG_VER_STRING "1.2.50" 493#define PNG_HEADER_VERSION_STRING \ 494 " libpng version 1.2.50 - July 10, 2012\n" 495 496#define PNG_LIBPNG_VER_SONUM 0 497#define PNG_LIBPNG_VER_DLLNUM 13 498 499/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 500#define PNG_LIBPNG_VER_MAJOR 1 501#define PNG_LIBPNG_VER_MINOR 2 502#define PNG_LIBPNG_VER_RELEASE 50 503/* This should match the numeric part of the final component of 504 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 505 */ 506 507#define PNG_LIBPNG_VER_BUILD 0 508 509/* Release Status */ 510#define PNG_LIBPNG_BUILD_ALPHA 1 511#define PNG_LIBPNG_BUILD_BETA 2 512#define PNG_LIBPNG_BUILD_RC 3 513#define PNG_LIBPNG_BUILD_STABLE 4 514#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 515 516/* Release-Specific Flags */ 517#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 518 PNG_LIBPNG_BUILD_STABLE only */ 519#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 520 PNG_LIBPNG_BUILD_SPECIAL */ 521#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 522 PNG_LIBPNG_BUILD_PRIVATE */ 523 524#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 525 526/* Careful here. At one time, Guy wanted to use 082, but that would be octal. 527 * We must not include leading zeros. 528 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 529 * version 1.0.0 was mis-numbered 100 instead of 10000). From 530 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 531 */ 532#define PNG_LIBPNG_VER 10250 /* 1.2.50 */ 533 534#ifndef PNG_VERSION_INFO_ONLY 535/* Include the compression library's header */ 536#include "zlib.h" 537#endif 538 539/* Include all user configurable info, including optional assembler routines */ 540#include "pngconf.h" 541 542/* 543 * Added at libpng-1.2.8 */ 544/* Ref MSDN: Private as priority over Special 545 * VS_FF_PRIVATEBUILD File *was not* built using standard release 546 * procedures. If this value is given, the StringFileInfo block must 547 * contain a PrivateBuild string. 548 * 549 * VS_FF_SPECIALBUILD File *was* built by the original company using 550 * standard release procedures but is a variation of the standard 551 * file of the same version number. If this value is given, the 552 * StringFileInfo block must contain a SpecialBuild string. 553 */ 554 555#ifdef PNG_USER_PRIVATEBUILD 556# define PNG_LIBPNG_BUILD_TYPE \ 557 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 558#else 559# ifdef PNG_LIBPNG_SPECIALBUILD 560# define PNG_LIBPNG_BUILD_TYPE \ 561 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 562# else 563# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 564# endif 565#endif 566 567#ifndef PNG_VERSION_INFO_ONLY 568 569/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 570#ifdef __cplusplus 571extern "C" { 572#endif /* __cplusplus */ 573 574/* This file is arranged in several sections. The first section contains 575 * structure and type definitions. The second section contains the external 576 * library functions, while the third has the internal library functions, 577 * which applications aren't expected to use directly. 578 */ 579 580#ifndef PNG_NO_TYPECAST_NULL 581#define int_p_NULL (int *)NULL 582#define png_bytep_NULL (png_bytep)NULL 583#define png_bytepp_NULL (png_bytepp)NULL 584#define png_doublep_NULL (png_doublep)NULL 585#define png_error_ptr_NULL (png_error_ptr)NULL 586#define png_flush_ptr_NULL (png_flush_ptr)NULL 587#define png_free_ptr_NULL (png_free_ptr)NULL 588#define png_infopp_NULL (png_infopp)NULL 589#define png_malloc_ptr_NULL (png_malloc_ptr)NULL 590#define png_read_status_ptr_NULL (png_read_status_ptr)NULL 591#define png_rw_ptr_NULL (png_rw_ptr)NULL 592#define png_structp_NULL (png_structp)NULL 593#define png_uint_16p_NULL (png_uint_16p)NULL 594#define png_voidp_NULL (png_voidp)NULL 595#define png_write_status_ptr_NULL (png_write_status_ptr)NULL 596#else 597#define int_p_NULL NULL 598#define png_bytep_NULL NULL 599#define png_bytepp_NULL NULL 600#define png_doublep_NULL NULL 601#define png_error_ptr_NULL NULL 602#define png_flush_ptr_NULL NULL 603#define png_free_ptr_NULL NULL 604#define png_infopp_NULL NULL 605#define png_malloc_ptr_NULL NULL 606#define png_read_status_ptr_NULL NULL 607#define png_rw_ptr_NULL NULL 608#define png_structp_NULL NULL 609#define png_uint_16p_NULL NULL 610#define png_voidp_NULL NULL 611#define png_write_status_ptr_NULL NULL 612#endif 613 614/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 615#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 616/* Version information for C files, stored in png.c. This had better match 617 * the version above. 618 */ 619#ifdef PNG_USE_GLOBAL_ARRAYS 620PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 621 /* Need room for 99.99.99beta99z */ 622#else 623#define png_libpng_ver png_get_header_ver(NULL) 624#endif 625 626#ifdef PNG_USE_GLOBAL_ARRAYS 627/* This was removed in version 1.0.5c */ 628/* Structures to facilitate easy interlacing. See png.c for more details */ 629PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 630PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 631PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 632PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 633PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 634PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 635/* This isn't currently used. If you need it, see png.c for more details. 636PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 637*/ 638#endif 639 640#endif /* PNG_NO_EXTERN */ 641 642/* Three color definitions. The order of the red, green, and blue, (and the 643 * exact size) is not important, although the size of the fields need to 644 * be png_byte or png_uint_16 (as defined below). 645 */ 646typedef struct png_color_struct 647{ 648 png_byte red; 649 png_byte green; 650 png_byte blue; 651} png_color; 652typedef png_color FAR * png_colorp; 653typedef png_color FAR * FAR * png_colorpp; 654 655typedef struct png_color_16_struct 656{ 657 png_byte index; /* used for palette files */ 658 png_uint_16 red; /* for use in red green blue files */ 659 png_uint_16 green; 660 png_uint_16 blue; 661 png_uint_16 gray; /* for use in grayscale files */ 662} png_color_16; 663typedef png_color_16 FAR * png_color_16p; 664typedef png_color_16 FAR * FAR * png_color_16pp; 665 666typedef struct png_color_8_struct 667{ 668 png_byte red; /* for use in red green blue files */ 669 png_byte green; 670 png_byte blue; 671 png_byte gray; /* for use in grayscale files */ 672 png_byte alpha; /* for alpha channel files */ 673} png_color_8; 674typedef png_color_8 FAR * png_color_8p; 675typedef png_color_8 FAR * FAR * png_color_8pp; 676 677/* 678 * The following two structures are used for the in-core representation 679 * of sPLT chunks. 680 */ 681typedef struct png_sPLT_entry_struct 682{ 683 png_uint_16 red; 684 png_uint_16 green; 685 png_uint_16 blue; 686 png_uint_16 alpha; 687 png_uint_16 frequency; 688} png_sPLT_entry; 689typedef png_sPLT_entry FAR * png_sPLT_entryp; 690typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 691 692/* When the depth of the sPLT palette is 8 bits, the color and alpha samples 693 * occupy the LSB of their respective members, and the MSB of each member 694 * is zero-filled. The frequency member always occupies the full 16 bits. 695 */ 696 697typedef struct png_sPLT_struct 698{ 699 png_charp name; /* palette name */ 700 png_byte depth; /* depth of palette samples */ 701 png_sPLT_entryp entries; /* palette entries */ 702 png_int_32 nentries; /* number of palette entries */ 703} png_sPLT_t; 704typedef png_sPLT_t FAR * png_sPLT_tp; 705typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 706 707#ifdef PNG_TEXT_SUPPORTED 708/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 709 * and whether that contents is compressed or not. The "key" field 710 * points to a regular zero-terminated C string. The "text", "lang", and 711 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 712 * However, the * structure returned by png_get_text() will always contain 713 * regular zero-terminated C strings (possibly empty), never NULL pointers, 714 * so they can be safely used in printf() and other string-handling functions. 715 */ 716typedef struct png_text_struct 717{ 718 int compression; /* compression value: 719 -1: tEXt, none 720 0: zTXt, deflate 721 1: iTXt, none 722 2: iTXt, deflate */ 723 png_charp key; /* keyword, 1-79 character description of "text" */ 724 png_charp text; /* comment, may be an empty string (ie "") 725 or a NULL pointer */ 726 png_size_t text_length; /* length of the text string */ 727#ifdef PNG_iTXt_SUPPORTED 728 png_size_t itxt_length; /* length of the itxt string */ 729 png_charp lang; /* language code, 0-79 characters 730 or a NULL pointer */ 731 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 732 chars or a NULL pointer */ 733#endif 734} png_text; 735typedef png_text FAR * png_textp; 736typedef png_text FAR * FAR * png_textpp; 737#endif 738 739/* Supported compression types for text in PNG files (tEXt, and zTXt). 740 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 741 */ 742#define PNG_TEXT_COMPRESSION_NONE_WR -3 743#define PNG_TEXT_COMPRESSION_zTXt_WR -2 744#define PNG_TEXT_COMPRESSION_NONE -1 745#define PNG_TEXT_COMPRESSION_zTXt 0 746#define PNG_ITXT_COMPRESSION_NONE 1 747#define PNG_ITXT_COMPRESSION_zTXt 2 748#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 749 750/* png_time is a way to hold the time in an machine independent way. 751 * Two conversions are provided, both from time_t and struct tm. There 752 * is no portable way to convert to either of these structures, as far 753 * as I know. If you know of a portable way, send it to me. As a side 754 * note - PNG has always been Year 2000 compliant! 755 */ 756typedef struct png_time_struct 757{ 758 png_uint_16 year; /* full year, as in, 1995 */ 759 png_byte month; /* month of year, 1 - 12 */ 760 png_byte day; /* day of month, 1 - 31 */ 761 png_byte hour; /* hour of day, 0 - 23 */ 762 png_byte minute; /* minute of hour, 0 - 59 */ 763 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 764} png_time; 765typedef png_time FAR * png_timep; 766typedef png_time FAR * FAR * png_timepp; 767 768#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 769 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 770/* png_unknown_chunk is a structure to hold queued chunks for which there is 771 * no specific support. The idea is that we can use this to queue 772 * up private chunks for output even though the library doesn't actually 773 * know about their semantics. 774 */ 775#define PNG_CHUNK_NAME_LENGTH 5 776typedef struct png_unknown_chunk_t 777{ 778 png_byte name[PNG_CHUNK_NAME_LENGTH]; 779 png_byte *data; 780 png_size_t size; 781 782 /* libpng-using applications should NOT directly modify this byte. */ 783 png_byte location; /* mode of operation at read time */ 784} 785png_unknown_chunk; 786typedef png_unknown_chunk FAR * png_unknown_chunkp; 787typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 788#endif 789 790/* png_info is a structure that holds the information in a PNG file so 791 * that the application can find out the characteristics of the image. 792 * If you are reading the file, this structure will tell you what is 793 * in the PNG file. If you are writing the file, fill in the information 794 * you want to put into the PNG file, then call png_write_info(). 795 * The names chosen should be very close to the PNG specification, so 796 * consult that document for information about the meaning of each field. 797 * 798 * With libpng < 0.95, it was only possible to directly set and read the 799 * the values in the png_info_struct, which meant that the contents and 800 * order of the values had to remain fixed. With libpng 0.95 and later, 801 * however, there are now functions that abstract the contents of 802 * png_info_struct from the application, so this makes it easier to use 803 * libpng with dynamic libraries, and even makes it possible to use 804 * libraries that don't have all of the libpng ancillary chunk-handing 805 * functionality. 806 * 807 * In any case, the order of the parameters in png_info_struct should NOT 808 * be changed for as long as possible to keep compatibility with applications 809 * that use the old direct-access method with png_info_struct. 810 * 811 * The following members may have allocated storage attached that should be 812 * cleaned up before the structure is discarded: palette, trans, text, 813 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 814 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 815 * are automatically freed when the info structure is deallocated, if they were 816 * allocated internally by libpng. This behavior can be changed by means 817 * of the png_data_freer() function. 818 * 819 * More allocation details: all the chunk-reading functions that 820 * change these members go through the corresponding png_set_* 821 * functions. A function to clear these members is available: see 822 * png_free_data(). The png_set_* functions do not depend on being 823 * able to point info structure members to any of the storage they are 824 * passed (they make their own copies), EXCEPT that the png_set_text 825 * functions use the same storage passed to them in the text_ptr or 826 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 827 * functions do not make their own copies. 828 */ 829typedef struct png_info_struct 830{ 831 /* The following are necessary for every PNG file */ 832 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 833 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 834 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 835 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 836 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 837 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 838 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 839 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 840 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 841 /* The following three should have been named *_method not *_type */ 842 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 843 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 844 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 845 846 /* The following is informational only on read, and not used on writes. */ 847 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 848 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 849 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 850 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 851 852 /* The rest of the data is optional. If you are reading, check the 853 * valid field to see if the information in these are valid. If you 854 * are writing, set the valid field to those chunks you want written, 855 * and initialize the appropriate fields below. 856 */ 857 858#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 859 /* The gAMA chunk describes the gamma characteristics of the system 860 * on which the image was created, normally in the range [1.0, 2.5]. 861 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 862 */ 863 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 864#endif 865 866#ifdef PNG_sRGB_SUPPORTED 867 /* GR-P, 0.96a */ 868 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 869 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 870#endif 871 872#ifdef PNG_TEXT_SUPPORTED 873 /* The tEXt, and zTXt chunks contain human-readable textual data in 874 * uncompressed, compressed, and optionally compressed forms, respectively. 875 * The data in "text" is an array of pointers to uncompressed, 876 * null-terminated C strings. Each chunk has a keyword that describes the 877 * textual data contained in that chunk. Keywords are not required to be 878 * unique, and the text string may be empty. Any number of text chunks may 879 * be in an image. 880 */ 881 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 882 int max_text PNG_DEPSTRUCT; /* current size of text array */ 883 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 884#endif /* PNG_TEXT_SUPPORTED */ 885 886#ifdef PNG_tIME_SUPPORTED 887 /* The tIME chunk holds the last time the displayed image data was 888 * modified. See the png_time struct for the contents of this struct. 889 */ 890 png_time mod_time PNG_DEPSTRUCT; 891#endif 892 893#ifdef PNG_sBIT_SUPPORTED 894 /* The sBIT chunk specifies the number of significant high-order bits 895 * in the pixel data. Values are in the range [1, bit_depth], and are 896 * only specified for the channels in the pixel data. The contents of 897 * the low-order bits is not specified. Data is valid if 898 * (valid & PNG_INFO_sBIT) is non-zero. 899 */ 900 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 901#endif 902 903#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 904defined(PNG_READ_BACKGROUND_SUPPORTED) 905 /* The tRNS chunk supplies transparency data for paletted images and 906 * other image types that don't need a full alpha channel. There are 907 * "num_trans" transparency values for a paletted image, stored in the 908 * same order as the palette colors, starting from index 0. Values 909 * for the data are in the range [0, 255], ranging from fully transparent 910 * to fully opaque, respectively. For non-paletted images, there is a 911 * single color specified that should be treated as fully transparent. 912 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 913 */ 914 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 915 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 916#endif 917 918#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 919 /* The bKGD chunk gives the suggested image background color if the 920 * display program does not have its own background color and the image 921 * is needs to composited onto a background before display. The colors 922 * in "background" are normally in the same color space/depth as the 923 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 924 */ 925 png_color_16 background PNG_DEPSTRUCT; 926#endif 927 928#ifdef PNG_oFFs_SUPPORTED 929 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 930 * and downwards from the top-left corner of the display, page, or other 931 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 932 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 933 */ 934 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 935 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 936 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 937#endif 938 939#ifdef PNG_pHYs_SUPPORTED 940 /* The pHYs chunk gives the physical pixel density of the image for 941 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 942 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 943 */ 944 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 945 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 946 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 947#endif 948 949#ifdef PNG_hIST_SUPPORTED 950 /* The hIST chunk contains the relative frequency or importance of the 951 * various palette entries, so that a viewer can intelligently select a 952 * reduced-color palette, if required. Data is an array of "num_palette" 953 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 954 * is non-zero. 955 */ 956 png_uint_16p hist PNG_DEPSTRUCT; 957#endif 958 959#ifdef PNG_cHRM_SUPPORTED 960 /* The cHRM chunk describes the CIE color characteristics of the monitor 961 * on which the PNG was created. This data allows the viewer to do gamut 962 * mapping of the input image to ensure that the viewer sees the same 963 * colors in the image as the creator. Values are in the range 964 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 965 */ 966#ifdef PNG_FLOATING_POINT_SUPPORTED 967 float x_white PNG_DEPSTRUCT; 968 float y_white PNG_DEPSTRUCT; 969 float x_red PNG_DEPSTRUCT; 970 float y_red PNG_DEPSTRUCT; 971 float x_green PNG_DEPSTRUCT; 972 float y_green PNG_DEPSTRUCT; 973 float x_blue PNG_DEPSTRUCT; 974 float y_blue PNG_DEPSTRUCT; 975#endif 976#endif 977 978#ifdef PNG_pCAL_SUPPORTED 979 /* The pCAL chunk describes a transformation between the stored pixel 980 * values and original physical data values used to create the image. 981 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 982 * range given by [pcal_X0, pcal_X1], and are further transformed by a 983 * (possibly non-linear) transformation function given by "pcal_type" 984 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 985 * defines below, and the PNG-Group's PNG extensions document for a 986 * complete description of the transformations and how they should be 987 * implemented, and for a description of the ASCII parameter strings. 988 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 989 */ 990 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 991 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 992 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 993 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 994 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 995 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 996 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 997#endif 998 999/* New members added in libpng-1.0.6 */ 1000#ifdef PNG_FREE_ME_SUPPORTED 1001 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1002#endif 1003 1004#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 1005 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1006 /* Storage for unknown chunks that the library doesn't recognize. */ 1007 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 1008 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 1009#endif 1010 1011#ifdef PNG_iCCP_SUPPORTED 1012 /* iCCP chunk data. */ 1013 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 1014 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 1015 /* Note to maintainer: should be png_bytep */ 1016 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 1017 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 1018#endif 1019 1020#ifdef PNG_sPLT_SUPPORTED 1021 /* Data on sPLT chunks (there may be more than one). */ 1022 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1023 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1024#endif 1025 1026#ifdef PNG_sCAL_SUPPORTED 1027 /* The sCAL chunk describes the actual physical dimensions of the 1028 * subject matter of the graphic. The chunk contains a unit specification 1029 * a byte value, and two ASCII strings representing floating-point 1030 * values. The values are width and height corresponsing to one pixel 1031 * in the image. This external representation is converted to double 1032 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1033 */ 1034 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1035#ifdef PNG_FLOATING_POINT_SUPPORTED 1036 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1037 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1038#endif 1039#ifdef PNG_FIXED_POINT_SUPPORTED 1040 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1041 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1042#endif 1043#endif 1044 1045#ifdef PNG_INFO_IMAGE_SUPPORTED 1046 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1047 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1048 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1049#endif 1050 1051#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1052 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1053#endif 1054 1055#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1056 png_fixed_point int_x_white PNG_DEPSTRUCT; 1057 png_fixed_point int_y_white PNG_DEPSTRUCT; 1058 png_fixed_point int_x_red PNG_DEPSTRUCT; 1059 png_fixed_point int_y_red PNG_DEPSTRUCT; 1060 png_fixed_point int_x_green PNG_DEPSTRUCT; 1061 png_fixed_point int_y_green PNG_DEPSTRUCT; 1062 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1063 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1064#endif 1065 1066} png_info; 1067 1068typedef png_info FAR * png_infop; 1069typedef png_info FAR * FAR * png_infopp; 1070 1071/* Maximum positive integer used in PNG is (2^31)-1 */ 1072#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1073#define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1074#define PNG_SIZE_MAX ((png_size_t)(-1)) 1075#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1076/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1077#define PNG_MAX_UINT PNG_UINT_31_MAX 1078#endif 1079 1080/* These describe the color_type field in png_info. */ 1081/* color type masks */ 1082#define PNG_COLOR_MASK_PALETTE 1 1083#define PNG_COLOR_MASK_COLOR 2 1084#define PNG_COLOR_MASK_ALPHA 4 1085 1086/* color types. Note that not all combinations are legal */ 1087#define PNG_COLOR_TYPE_GRAY 0 1088#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1089#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1090#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1091#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1092/* aliases */ 1093#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1094#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1095 1096/* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1097#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1098#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1099 1100/* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1101#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1102#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1103#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1104 1105/* These are for the interlacing type. These values should NOT be changed. */ 1106#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1107#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1108#define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1109 1110/* These are for the oFFs chunk. These values should NOT be changed. */ 1111#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1112#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1113#define PNG_OFFSET_LAST 2 /* Not a valid value */ 1114 1115/* These are for the pCAL chunk. These values should NOT be changed. */ 1116#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1117#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1118#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1119#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1120#define PNG_EQUATION_LAST 4 /* Not a valid value */ 1121 1122/* These are for the sCAL chunk. These values should NOT be changed. */ 1123#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1124#define PNG_SCALE_METER 1 /* meters per pixel */ 1125#define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1126#define PNG_SCALE_LAST 3 /* Not a valid value */ 1127 1128/* These are for the pHYs chunk. These values should NOT be changed. */ 1129#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1130#define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1131#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1132 1133/* These are for the sRGB chunk. These values should NOT be changed. */ 1134#define PNG_sRGB_INTENT_PERCEPTUAL 0 1135#define PNG_sRGB_INTENT_RELATIVE 1 1136#define PNG_sRGB_INTENT_SATURATION 2 1137#define PNG_sRGB_INTENT_ABSOLUTE 3 1138#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1139 1140/* This is for text chunks */ 1141#define PNG_KEYWORD_MAX_LENGTH 79 1142 1143/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1144#define PNG_MAX_PALETTE_LENGTH 256 1145 1146/* These determine if an ancillary chunk's data has been successfully read 1147 * from the PNG header, or if the application has filled in the corresponding 1148 * data in the info_struct to be written into the output file. The values 1149 * of the PNG_INFO_<chunk> defines should NOT be changed. 1150 */ 1151#define PNG_INFO_gAMA 0x0001 1152#define PNG_INFO_sBIT 0x0002 1153#define PNG_INFO_cHRM 0x0004 1154#define PNG_INFO_PLTE 0x0008 1155#define PNG_INFO_tRNS 0x0010 1156#define PNG_INFO_bKGD 0x0020 1157#define PNG_INFO_hIST 0x0040 1158#define PNG_INFO_pHYs 0x0080 1159#define PNG_INFO_oFFs 0x0100 1160#define PNG_INFO_tIME 0x0200 1161#define PNG_INFO_pCAL 0x0400 1162#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1163#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1164#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1165#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1166#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1167 1168/* This is used for the transformation routines, as some of them 1169 * change these values for the row. It also should enable using 1170 * the routines for other purposes. 1171 */ 1172typedef struct png_row_info_struct 1173{ 1174 png_uint_32 width; /* width of row */ 1175 png_uint_32 rowbytes; /* number of bytes in row */ 1176 png_byte color_type; /* color type of row */ 1177 png_byte bit_depth; /* bit depth of row */ 1178 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1179 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1180} png_row_info; 1181 1182typedef png_row_info FAR * png_row_infop; 1183typedef png_row_info FAR * FAR * png_row_infopp; 1184 1185/* These are the function types for the I/O functions and for the functions 1186 * that allow the user to override the default I/O functions with his or her 1187 * own. The png_error_ptr type should match that of user-supplied warning 1188 * and error functions, while the png_rw_ptr type should match that of the 1189 * user read/write data functions. 1190 */ 1191typedef struct png_struct_def png_struct; 1192typedef png_struct FAR * png_structp; 1193 1194typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1195typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1196typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1197typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1198 int)); 1199typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1200 int)); 1201 1202#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1203typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1204typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1205typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1206 png_uint_32, int)); 1207#endif 1208 1209#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1210 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1211 defined(PNG_LEGACY_SUPPORTED) 1212typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1213 png_row_infop, png_bytep)); 1214#endif 1215 1216#ifdef PNG_USER_CHUNKS_SUPPORTED 1217typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1218#endif 1219#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1220typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1221#endif 1222 1223/* Transform masks for the high-level interface */ 1224#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1225#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1226#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1227#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1228#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1229#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1230#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1231#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1232#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1233#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1234#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1235#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1236#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1237/* Added to libpng-1.2.34 */ 1238#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1239#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1240/* Added to libpng-1.2.41 */ 1241#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1242 1243/* Flags for MNG supported features */ 1244#define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1245#define PNG_FLAG_MNG_FILTER_64 0x04 1246#define PNG_ALL_MNG_FEATURES 0x05 1247 1248typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1249typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1250 1251/* The structure that holds the information to read and write PNG files. 1252 * The only people who need to care about what is inside of this are the 1253 * people who will be modifying the library for their own special needs. 1254 * It should NOT be accessed directly by an application, except to store 1255 * the jmp_buf. 1256 */ 1257 1258struct png_struct_def 1259{ 1260#ifdef PNG_SETJMP_SUPPORTED 1261 jmp_buf jmpbuf; /* used in png_error */ 1262#endif 1263 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1264 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1265 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1266 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1267 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1268 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1269 1270#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1271 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1272#endif 1273 1274#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1275 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1276#endif 1277 1278/* These were added in libpng-1.0.2 */ 1279#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1280#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1281 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1282 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1283 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1284 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1285#endif 1286#endif 1287 1288 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1289 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1290 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1291 1292 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1293 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1294 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1295 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1296 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1297 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1298 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1299 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1300 1301 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1302 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1303 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1304 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1305 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1306#if 0 /* Replaced with the following in libpng-1.2.43 */ 1307 png_size_t irowbytes PNG_DEPSTRUCT; 1308#endif 1309/* Added in libpng-1.2.43 */ 1310#ifdef PNG_USER_LIMITS_SUPPORTED 1311 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1312 * chunks that can be stored (0 means unlimited). 1313 */ 1314 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1315#endif 1316 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1317 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1318 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1319 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1320#ifndef PNG_NO_WRITE_FILTER 1321 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1322 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1323 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1324 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1325#endif 1326 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1327 1328 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1329 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1330 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1331 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1332 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1333 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1334 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1335 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1336 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1337 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1338 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1339 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1340 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1341 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1342 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1343 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1344 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1345 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1346 1347#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1348#ifdef PNG_LEGACY_SUPPORTED 1349 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1350#else 1351 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1352#endif 1353#endif 1354 1355#ifdef PNG_bKGD_SUPPORTED 1356 png_byte background_gamma_type PNG_DEPSTRUCT; 1357# ifdef PNG_FLOATING_POINT_SUPPORTED 1358 float background_gamma PNG_DEPSTRUCT; 1359# endif 1360 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1361#ifdef PNG_READ_GAMMA_SUPPORTED 1362 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1363#endif 1364#endif /* PNG_bKGD_SUPPORTED */ 1365 1366#ifdef PNG_WRITE_FLUSH_SUPPORTED 1367 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1368 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1369 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1370#endif 1371 1372#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1373 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1374#ifdef PNG_FLOATING_POINT_SUPPORTED 1375 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1376 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1377#endif 1378#endif 1379 1380#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1381 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1382 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1383 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1384 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1385 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1386 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1387#endif 1388 1389#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1390 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1391#endif 1392 1393#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1394 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1395#endif 1396 1397#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1398 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1399 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1400 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1401#endif 1402 1403 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1404 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1405#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1406 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1407 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1408 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1409 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1410 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1411 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1412 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1413 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1414 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1415 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1416 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1417 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1418 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1419 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1420 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1421 1422# ifdef PNG_TEXT_SUPPORTED 1423 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1424 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1425 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1426 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1427# endif /* PNG_TEXT_SUPPORTED */ 1428#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1429 1430#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1431/* for the Borland special 64K segment handler */ 1432 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1433 png_bytep offset_table PNG_DEPSTRUCT; 1434 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1435 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1436 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1437#endif 1438 1439#ifdef PNG_READ_DITHER_SUPPORTED 1440 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1441 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1442#endif 1443 1444#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1445 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1446#endif 1447 1448#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1449 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1450 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1451 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1452 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1453 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1454 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1455 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1456#endif 1457 1458#ifdef PNG_TIME_RFC1123_SUPPORTED 1459 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1460#endif 1461 1462/* New members added in libpng-1.0.6 */ 1463 1464#ifdef PNG_FREE_ME_SUPPORTED 1465 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1466#endif 1467 1468#ifdef PNG_USER_CHUNKS_SUPPORTED 1469 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1470 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1471#endif 1472 1473#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1474 int num_chunk_list PNG_DEPSTRUCT; 1475 png_bytep chunk_list PNG_DEPSTRUCT; 1476#endif 1477 1478/* New members added in libpng-1.0.3 */ 1479#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1480 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1481 /* These were changed from png_byte in libpng-1.0.6 */ 1482 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1483 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1484 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1485#endif 1486 1487/* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1488#if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1489 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1490 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1491/* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1492#ifdef PNG_1_0_X 1493 png_byte mng_features_permitted PNG_DEPSTRUCT; 1494#else 1495 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1496#endif /* PNG_1_0_X */ 1497#endif 1498 1499/* New member added in libpng-1.0.7 */ 1500#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1501 png_fixed_point int_gamma PNG_DEPSTRUCT; 1502#endif 1503 1504/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1505#ifdef PNG_MNG_FEATURES_SUPPORTED 1506 png_byte filter_type PNG_DEPSTRUCT; 1507#endif 1508 1509#ifdef PNG_1_0_X 1510/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1511 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1512#endif 1513 1514/* New members added in libpng-1.2.0 */ 1515#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1516# ifndef PNG_1_0_X 1517# ifdef PNG_MMX_CODE_SUPPORTED 1518 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1519 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1520# endif 1521 png_uint_32 asm_flags PNG_DEPSTRUCT; 1522# endif 1523#endif 1524 1525/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1526#ifdef PNG_USER_MEM_SUPPORTED 1527 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1528 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1529 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1530#endif 1531 1532/* New member added in libpng-1.0.13 and 1.2.0 */ 1533 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1534 1535#ifdef PNG_READ_DITHER_SUPPORTED 1536/* The following three members were added at version 1.0.14 and 1.2.4 */ 1537 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1538 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1539 /* in the palette */ 1540 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1541 /* palette color */ 1542#endif 1543 1544/* New members added in libpng-1.0.16 and 1.2.6 */ 1545 png_byte compression_type PNG_DEPSTRUCT; 1546 1547#ifdef PNG_USER_LIMITS_SUPPORTED 1548 png_uint_32 user_width_max PNG_DEPSTRUCT; 1549 png_uint_32 user_height_max PNG_DEPSTRUCT; 1550#endif 1551 1552/* New member added in libpng-1.0.25 and 1.2.17 */ 1553#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1554 /* Storage for unknown chunk that the library doesn't recognize. */ 1555 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1556#endif 1557 1558/* New members added in libpng-1.2.26 */ 1559 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1560 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1561 1562/* New member added in libpng-1.2.30 */ 1563 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1564 1565 1566}; 1567 1568 1569/* This triggers a compiler error in png.c, if png.c and png.h 1570 * do not agree upon the version number. 1571 */ 1572typedef png_structp version_1_2_50; 1573 1574typedef png_struct FAR * FAR * png_structpp; 1575 1576/* Here are the function definitions most commonly used. This is not 1577 * the place to find out how to use libpng. See libpng.txt for the 1578 * full explanation, see example.c for the summary. This just provides 1579 * a simple one line description of the use of each function. 1580 */ 1581 1582/* Returns the version number of the library */ 1583extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1584 1585/* Tell lib we have already handled the first <num_bytes> magic bytes. 1586 * Handling more than 8 bytes from the beginning of the file is an error. 1587 */ 1588extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1589 int num_bytes)); 1590 1591/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1592 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1593 * signature, and non-zero otherwise. Having num_to_check == 0 or 1594 * start > 7 will always fail (ie return non-zero). 1595 */ 1596extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1597 png_size_t num_to_check)); 1598 1599/* Simple signature checking function. This is the same as calling 1600 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1601 */ 1602extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1603 1604/* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1605extern PNG_EXPORT(png_structp,png_create_read_struct) 1606 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1607 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1608 1609/* Allocate and initialize png_ptr struct for writing, and any other memory */ 1610extern PNG_EXPORT(png_structp,png_create_write_struct) 1611 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1612 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1613 1614#ifdef PNG_WRITE_SUPPORTED 1615extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1616 PNGARG((png_structp png_ptr)); 1617#endif 1618 1619#ifdef PNG_WRITE_SUPPORTED 1620extern PNG_EXPORT(void,png_set_compression_buffer_size) 1621 PNGARG((png_structp png_ptr, png_uint_32 size)); 1622#endif 1623 1624/* Reset the compression stream */ 1625extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1626 1627/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1628#ifdef PNG_USER_MEM_SUPPORTED 1629extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1630 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1631 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1632 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1633extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1634 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1635 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1636 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1637#endif 1638 1639/* Write a PNG chunk - size, type, (optional) data, CRC. */ 1640extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1641 png_bytep chunk_name, png_bytep data, png_size_t length)); 1642 1643/* Write the start of a PNG chunk - length and chunk name. */ 1644extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1645 png_bytep chunk_name, png_uint_32 length)); 1646 1647/* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1648extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1649 png_bytep data, png_size_t length)); 1650 1651/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1652extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1653 1654/* Allocate and initialize the info structure */ 1655extern PNG_EXPORT(png_infop,png_create_info_struct) 1656 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1657 1658#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1659/* Initialize the info structure (old interface - DEPRECATED) */ 1660extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1661 PNG_DEPRECATED; 1662#undef png_info_init 1663#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1664 png_sizeof(png_info)); 1665#endif 1666 1667extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1668 png_size_t png_info_struct_size)); 1669 1670/* Writes all the PNG information before the image. */ 1671extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1672 png_infop info_ptr)); 1673extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1674 png_infop info_ptr)); 1675 1676#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1677/* Read the information before the actual image data. */ 1678extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1679 png_infop info_ptr)); 1680#endif 1681 1682#ifdef PNG_TIME_RFC1123_SUPPORTED 1683extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1684 PNGARG((png_structp png_ptr, png_timep ptime)); 1685#endif 1686 1687#ifdef PNG_CONVERT_tIME_SUPPORTED 1688/* Convert from a struct tm to png_time */ 1689extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1690 struct tm FAR * ttime)); 1691 1692/* Convert from time_t to png_time. Uses gmtime() */ 1693extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1694 time_t ttime)); 1695#endif /* PNG_CONVERT_tIME_SUPPORTED */ 1696 1697#ifdef PNG_READ_EXPAND_SUPPORTED 1698/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1699extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1700#ifndef PNG_1_0_X 1701extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1702 png_ptr)); 1703#endif 1704extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1705extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1706#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1707/* Deprecated */ 1708extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1709 png_ptr)) PNG_DEPRECATED; 1710#endif 1711#endif 1712 1713#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1714/* Use blue, green, red order for pixels. */ 1715extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1716#endif 1717 1718#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1719/* Expand the grayscale to 24-bit RGB if necessary. */ 1720extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1721#endif 1722 1723#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1724/* Reduce RGB to grayscale. */ 1725#ifdef PNG_FLOATING_POINT_SUPPORTED 1726extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1727 int error_action, double red, double green )); 1728#endif 1729extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1730 int error_action, png_fixed_point red, png_fixed_point green )); 1731extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1732 png_ptr)); 1733#endif 1734 1735extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1736 png_colorp palette)); 1737 1738#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1739extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1740#endif 1741 1742#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1743 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1744extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1745#endif 1746 1747#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1748 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1749extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1750#endif 1751 1752#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1753/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1754extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1755 png_uint_32 filler, int flags)); 1756/* The values of the PNG_FILLER_ defines should NOT be changed */ 1757#define PNG_FILLER_BEFORE 0 1758#define PNG_FILLER_AFTER 1 1759/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1760#ifndef PNG_1_0_X 1761extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1762 png_uint_32 filler, int flags)); 1763#endif 1764#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1765 1766#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1767/* Swap bytes in 16-bit depth files. */ 1768extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1769#endif 1770 1771#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1772/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1773extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1774#endif 1775 1776#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1777/* Swap packing order of pixels in bytes. */ 1778extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1779#endif 1780 1781#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1782/* Converts files to legal bit depths. */ 1783extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1784 png_color_8p true_bits)); 1785#endif 1786 1787#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1788 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1789/* Have the code handle the interlacing. Returns the number of passes. */ 1790extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1791#endif 1792 1793#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1794/* Invert monochrome files */ 1795extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1796#endif 1797 1798#ifdef PNG_READ_BACKGROUND_SUPPORTED 1799/* Handle alpha and tRNS by replacing with a background color. */ 1800#ifdef PNG_FLOATING_POINT_SUPPORTED 1801extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1802 png_color_16p background_color, int background_gamma_code, 1803 int need_expand, double background_gamma)); 1804#endif 1805#define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1806#define PNG_BACKGROUND_GAMMA_SCREEN 1 1807#define PNG_BACKGROUND_GAMMA_FILE 2 1808#define PNG_BACKGROUND_GAMMA_UNIQUE 3 1809#endif 1810 1811#ifdef PNG_READ_16_TO_8_SUPPORTED 1812/* Strip the second byte of information from a 16-bit depth file. */ 1813extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1814#endif 1815 1816#ifdef PNG_READ_DITHER_SUPPORTED 1817/* Turn on dithering, and reduce the palette to the number of colors available. */ 1818extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1819 png_colorp palette, int num_palette, int maximum_colors, 1820 png_uint_16p histogram, int full_dither)); 1821#endif 1822 1823#ifdef PNG_READ_GAMMA_SUPPORTED 1824/* Handle gamma correction. Screen_gamma=(display_exponent) */ 1825#ifdef PNG_FLOATING_POINT_SUPPORTED 1826extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1827 double screen_gamma, double default_file_gamma)); 1828#endif 1829#endif 1830 1831#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1832#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1833 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1834/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1835/* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1836extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1837 int empty_plte_permitted)) PNG_DEPRECATED; 1838#endif 1839#endif 1840 1841#ifdef PNG_WRITE_FLUSH_SUPPORTED 1842/* Set how many lines between output flushes - 0 for no flushing */ 1843extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1844/* Flush the current PNG output buffer */ 1845extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1846#endif 1847 1848/* Optional update palette with requested transformations */ 1849extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1850 1851/* Optional call to update the users info structure */ 1852extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1853 png_infop info_ptr)); 1854 1855#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1856/* Read one or more rows of image data. */ 1857extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1858 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1859#endif 1860 1861#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1862/* Read a row of data. */ 1863extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1864 png_bytep row, 1865 png_bytep display_row)); 1866#endif 1867 1868#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1869/* Read the whole image into memory at once. */ 1870extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1871 png_bytepp image)); 1872#endif 1873 1874/* Write a row of image data */ 1875extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1876 png_bytep row)); 1877 1878/* Write a few rows of image data */ 1879extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1880 png_bytepp row, png_uint_32 num_rows)); 1881 1882/* Write the image data */ 1883extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1884 png_bytepp image)); 1885 1886/* Writes the end of the PNG file. */ 1887extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1888 png_infop info_ptr)); 1889 1890#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1891/* Read the end of the PNG file. */ 1892extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1893 png_infop info_ptr)); 1894#endif 1895 1896/* Free any memory associated with the png_info_struct */ 1897extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1898 png_infopp info_ptr_ptr)); 1899 1900/* Free any memory associated with the png_struct and the png_info_structs */ 1901extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1902 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1903 1904/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1905extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1906 png_infop end_info_ptr)) PNG_DEPRECATED; 1907 1908/* Free any memory associated with the png_struct and the png_info_structs */ 1909extern PNG_EXPORT(void,png_destroy_write_struct) 1910 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1911 1912/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1913extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1914 1915/* Set the libpng method of handling chunk CRC errors */ 1916extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1917 int crit_action, int ancil_action)); 1918 1919/* Values for png_set_crc_action() to say how to handle CRC errors in 1920 * ancillary and critical chunks, and whether to use the data contained 1921 * therein. Note that it is impossible to "discard" data in a critical 1922 * chunk. For versions prior to 0.90, the action was always error/quit, 1923 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1924 * chunks is warn/discard. These values should NOT be changed. 1925 * 1926 * value action:critical action:ancillary 1927 */ 1928#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1929#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1930#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1931#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1932#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1933#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1934 1935/* These functions give the user control over the scan-line filtering in 1936 * libpng and the compression methods used by zlib. These functions are 1937 * mainly useful for testing, as the defaults should work with most users. 1938 * Those users who are tight on memory or want faster performance at the 1939 * expense of compression can modify them. See the compression library 1940 * header file (zlib.h) for an explination of the compression functions. 1941 */ 1942 1943/* Set the filtering method(s) used by libpng. Currently, the only valid 1944 * value for "method" is 0. 1945 */ 1946extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1947 int filters)); 1948 1949/* Flags for png_set_filter() to say which filters to use. The flags 1950 * are chosen so that they don't conflict with real filter types 1951 * below, in case they are supplied instead of the #defined constants. 1952 * These values should NOT be changed. 1953 */ 1954#define PNG_NO_FILTERS 0x00 1955#define PNG_FILTER_NONE 0x08 1956#define PNG_FILTER_SUB 0x10 1957#define PNG_FILTER_UP 0x20 1958#define PNG_FILTER_AVG 0x40 1959#define PNG_FILTER_PAETH 0x80 1960#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1961 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1962 1963/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1964 * These defines should NOT be changed. 1965 */ 1966#define PNG_FILTER_VALUE_NONE 0 1967#define PNG_FILTER_VALUE_SUB 1 1968#define PNG_FILTER_VALUE_UP 2 1969#define PNG_FILTER_VALUE_AVG 3 1970#define PNG_FILTER_VALUE_PAETH 4 1971#define PNG_FILTER_VALUE_LAST 5 1972 1973#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1974/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1975 * defines, either the default (minimum-sum-of-absolute-differences), or 1976 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1977 * 1978 * Weights are factors >= 1.0, indicating how important it is to keep the 1979 * filter type consistent between rows. Larger numbers mean the current 1980 * filter is that many times as likely to be the same as the "num_weights" 1981 * previous filters. This is cumulative for each previous row with a weight. 1982 * There needs to be "num_weights" values in "filter_weights", or it can be 1983 * NULL if the weights aren't being specified. Weights have no influence on 1984 * the selection of the first row filter. Well chosen weights can (in theory) 1985 * improve the compression for a given image. 1986 * 1987 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1988 * filter type. Higher costs indicate more decoding expense, and are 1989 * therefore less likely to be selected over a filter with lower computational 1990 * costs. There needs to be a value in "filter_costs" for each valid filter 1991 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1992 * setting the costs. Costs try to improve the speed of decompression without 1993 * unduly increasing the compressed image size. 1994 * 1995 * A negative weight or cost indicates the default value is to be used, and 1996 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1997 * The default values for both weights and costs are currently 1.0, but may 1998 * change if good general weighting/cost heuristics can be found. If both 1999 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 2000 * to the UNWEIGHTED method, but with added encoding time/computation. 2001 */ 2002#ifdef PNG_FLOATING_POINT_SUPPORTED 2003extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 2004 int heuristic_method, int num_weights, png_doublep filter_weights, 2005 png_doublep filter_costs)); 2006#endif 2007#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 2008 2009/* Heuristic used for row filter selection. These defines should NOT be 2010 * changed. 2011 */ 2012#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 2013#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 2014#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 2015#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 2016 2017/* Set the library compression level. Currently, valid values range from 2018 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2019 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2020 * shown that zlib compression levels 3-6 usually perform as well as level 9 2021 * for PNG images, and do considerably fewer caclulations. In the future, 2022 * these values may not correspond directly to the zlib compression levels. 2023 */ 2024extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2025 int level)); 2026 2027extern PNG_EXPORT(void,png_set_compression_mem_level) 2028 PNGARG((png_structp png_ptr, int mem_level)); 2029 2030extern PNG_EXPORT(void,png_set_compression_strategy) 2031 PNGARG((png_structp png_ptr, int strategy)); 2032 2033extern PNG_EXPORT(void,png_set_compression_window_bits) 2034 PNGARG((png_structp png_ptr, int window_bits)); 2035 2036extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2037 int method)); 2038 2039/* These next functions are called for input/output, memory, and error 2040 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2041 * and call standard C I/O routines such as fread(), fwrite(), and 2042 * fprintf(). These functions can be made to use other I/O routines 2043 * at run time for those applications that need to handle I/O in a 2044 * different manner by calling png_set_???_fn(). See libpng.txt for 2045 * more information. 2046 */ 2047 2048#ifdef PNG_STDIO_SUPPORTED 2049/* Initialize the input/output for the PNG file to the default functions. */ 2050extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2051#endif 2052 2053/* Replace the (error and abort), and warning functions with user 2054 * supplied functions. If no messages are to be printed you must still 2055 * write and use replacement functions. The replacement error_fn should 2056 * still do a longjmp to the last setjmp location if you are using this 2057 * method of error handling. If error_fn or warning_fn is NULL, the 2058 * default function will be used. 2059 */ 2060 2061extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2062 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2063 2064/* Return the user pointer associated with the error functions */ 2065extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2066 2067/* Replace the default data output functions with a user supplied one(s). 2068 * If buffered output is not used, then output_flush_fn can be set to NULL. 2069 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2070 * output_flush_fn will be ignored (and thus can be NULL). 2071 * It is probably a mistake to use NULL for output_flush_fn if 2072 * write_data_fn is not also NULL unless you have built libpng with 2073 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2074 * default flush function, which uses the standard *FILE structure, will 2075 * be used. 2076 */ 2077extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2078 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2079 2080/* Replace the default data input function with a user supplied one. */ 2081extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2082 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2083 2084/* Return the user pointer associated with the I/O functions */ 2085extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2086 2087extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2088 png_read_status_ptr read_row_fn)); 2089 2090extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2091 png_write_status_ptr write_row_fn)); 2092 2093#ifdef PNG_USER_MEM_SUPPORTED 2094/* Replace the default memory allocation functions with user supplied one(s). */ 2095extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2096 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2097/* Return the user pointer associated with the memory functions */ 2098extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2099#endif 2100 2101#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2102 defined(PNG_LEGACY_SUPPORTED) 2103extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2104 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2105#endif 2106 2107#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2108 defined(PNG_LEGACY_SUPPORTED) 2109extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2110 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2111#endif 2112 2113#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2114 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2115 defined(PNG_LEGACY_SUPPORTED) 2116extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2117 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2118 int user_transform_channels)); 2119/* Return the user pointer associated with the user transform functions */ 2120extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2121 PNGARG((png_structp png_ptr)); 2122#endif 2123 2124#ifdef PNG_USER_CHUNKS_SUPPORTED 2125extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2126 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2127extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2128 png_ptr)); 2129#endif 2130 2131#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2132/* Sets the function callbacks for the push reader, and a pointer to a 2133 * user-defined structure available to the callback functions. 2134 */ 2135extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2136 png_voidp progressive_ptr, 2137 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2138 png_progressive_end_ptr end_fn)); 2139 2140/* Returns the user pointer associated with the push read functions */ 2141extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2142 PNGARG((png_structp png_ptr)); 2143 2144/* Function to be called when data becomes available */ 2145extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2146 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2147 2148/* Function that combines rows. Not very much different than the 2149 * png_combine_row() call. Is this even used????? 2150 */ 2151extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2152 png_bytep old_row, png_bytep new_row)); 2153#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2154 2155extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2156 png_uint_32 size)) PNG_ALLOCATED; 2157 2158#ifdef PNG_1_0_X 2159# define png_malloc_warn png_malloc 2160#else 2161/* Added at libpng version 1.2.4 */ 2162extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2163 png_uint_32 size)) PNG_ALLOCATED; 2164#endif 2165 2166/* Frees a pointer allocated by png_malloc() */ 2167extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2168 2169#ifdef PNG_1_0_X 2170/* Function to allocate memory for zlib. */ 2171extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2172 uInt size)); 2173 2174/* Function to free memory for zlib */ 2175extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2176#endif 2177 2178/* Free data that was allocated internally */ 2179extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2180 png_infop info_ptr, png_uint_32 free_me, int num)); 2181#ifdef PNG_FREE_ME_SUPPORTED 2182/* Reassign responsibility for freeing existing data, whether allocated 2183 * by libpng or by the application 2184 */ 2185extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2186 png_infop info_ptr, int freer, png_uint_32 mask)); 2187#endif 2188/* Assignments for png_data_freer */ 2189#define PNG_DESTROY_WILL_FREE_DATA 1 2190#define PNG_SET_WILL_FREE_DATA 1 2191#define PNG_USER_WILL_FREE_DATA 2 2192/* Flags for png_ptr->free_me and info_ptr->free_me */ 2193#define PNG_FREE_HIST 0x0008 2194#define PNG_FREE_ICCP 0x0010 2195#define PNG_FREE_SPLT 0x0020 2196#define PNG_FREE_ROWS 0x0040 2197#define PNG_FREE_PCAL 0x0080 2198#define PNG_FREE_SCAL 0x0100 2199#define PNG_FREE_UNKN 0x0200 2200#define PNG_FREE_LIST 0x0400 2201#define PNG_FREE_PLTE 0x1000 2202#define PNG_FREE_TRNS 0x2000 2203#define PNG_FREE_TEXT 0x4000 2204#define PNG_FREE_ALL 0x7fff 2205#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2206 2207#ifdef PNG_USER_MEM_SUPPORTED 2208extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2209 png_uint_32 size)) PNG_ALLOCATED; 2210extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2211 png_voidp ptr)); 2212#endif 2213 2214extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2215 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2216 2217extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2218 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2219 2220#if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2221extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2222 int check)); 2223#endif /* USE_FAR_KEYWORD */ 2224 2225#ifndef PNG_NO_ERROR_TEXT 2226/* Fatal error in PNG image of libpng - can't continue */ 2227extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2228 png_const_charp error_message)) PNG_NORETURN; 2229 2230/* The same, but the chunk name is prepended to the error string. */ 2231extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2232 png_const_charp error_message)) PNG_NORETURN; 2233#else 2234/* Fatal error in PNG image of libpng - can't continue */ 2235extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2236#endif 2237 2238#ifndef PNG_NO_WARNINGS 2239/* Non-fatal error in libpng. Can continue, but may have a problem. */ 2240extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2241 png_const_charp warning_message)); 2242 2243#ifdef PNG_READ_SUPPORTED 2244/* Non-fatal error in libpng, chunk name is prepended to message. */ 2245extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2246 png_const_charp warning_message)); 2247#endif /* PNG_READ_SUPPORTED */ 2248#endif /* PNG_NO_WARNINGS */ 2249 2250/* The png_set_<chunk> functions are for storing values in the png_info_struct. 2251 * Similarly, the png_get_<chunk> calls are used to read values from the 2252 * png_info_struct, either storing the parameters in the passed variables, or 2253 * setting pointers into the png_info_struct where the data is stored. The 2254 * png_get_<chunk> functions return a non-zero value if the data was available 2255 * in info_ptr, or return zero and do not change any of the parameters if the 2256 * data was not available. 2257 * 2258 * These functions should be used instead of directly accessing png_info 2259 * to avoid problems with future changes in the size and internal layout of 2260 * png_info_struct. 2261 */ 2262/* Returns "flag" if chunk data is valid in info_ptr. */ 2263extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2264png_infop info_ptr, png_uint_32 flag)); 2265 2266/* Returns number of bytes needed to hold a transformed row. */ 2267extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2268png_infop info_ptr)); 2269 2270#ifdef PNG_INFO_IMAGE_SUPPORTED 2271/* Returns row_pointers, which is an array of pointers to scanlines that was 2272 * returned from png_read_png(). 2273 */ 2274extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2275png_infop info_ptr)); 2276/* Set row_pointers, which is an array of pointers to scanlines for use 2277 * by png_write_png(). 2278 */ 2279extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2280 png_infop info_ptr, png_bytepp row_pointers)); 2281#endif 2282 2283/* Returns number of color channels in image. */ 2284extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2285png_infop info_ptr)); 2286 2287#ifdef PNG_EASY_ACCESS_SUPPORTED 2288/* Returns image width in pixels. */ 2289extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2290png_ptr, png_infop info_ptr)); 2291 2292/* Returns image height in pixels. */ 2293extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2294png_ptr, png_infop info_ptr)); 2295 2296/* Returns image bit_depth. */ 2297extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2298png_ptr, png_infop info_ptr)); 2299 2300/* Returns image color_type. */ 2301extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2302png_ptr, png_infop info_ptr)); 2303 2304/* Returns image filter_type. */ 2305extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2306png_ptr, png_infop info_ptr)); 2307 2308/* Returns image interlace_type. */ 2309extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2310png_ptr, png_infop info_ptr)); 2311 2312/* Returns image compression_type. */ 2313extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2314png_ptr, png_infop info_ptr)); 2315 2316/* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2317extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2318png_ptr, png_infop info_ptr)); 2319extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2320png_ptr, png_infop info_ptr)); 2321extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2322png_ptr, png_infop info_ptr)); 2323 2324/* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2325#ifdef PNG_FLOATING_POINT_SUPPORTED 2326extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2327png_ptr, png_infop info_ptr)); 2328#endif 2329 2330/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2331extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2332png_ptr, png_infop info_ptr)); 2333extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2334png_ptr, png_infop info_ptr)); 2335extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2336png_ptr, png_infop info_ptr)); 2337extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2338png_ptr, png_infop info_ptr)); 2339 2340#endif /* PNG_EASY_ACCESS_SUPPORTED */ 2341 2342/* Returns pointer to signature string read from PNG header */ 2343extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2344png_infop info_ptr)); 2345 2346#ifdef PNG_bKGD_SUPPORTED 2347extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2348 png_infop info_ptr, png_color_16p *background)); 2349#endif 2350 2351#ifdef PNG_bKGD_SUPPORTED 2352extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2353 png_infop info_ptr, png_color_16p background)); 2354#endif 2355 2356#ifdef PNG_cHRM_SUPPORTED 2357#ifdef PNG_FLOATING_POINT_SUPPORTED 2358extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2359 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2360 double *red_y, double *green_x, double *green_y, double *blue_x, 2361 double *blue_y)); 2362#endif 2363#ifdef PNG_FIXED_POINT_SUPPORTED 2364extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2365 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2366 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2367 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2368 *int_blue_x, png_fixed_point *int_blue_y)); 2369#endif 2370#endif 2371 2372#ifdef PNG_cHRM_SUPPORTED 2373#ifdef PNG_FLOATING_POINT_SUPPORTED 2374extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2375 png_infop info_ptr, double white_x, double white_y, double red_x, 2376 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2377#endif 2378#ifdef PNG_FIXED_POINT_SUPPORTED 2379extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2380 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2381 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2382 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2383 png_fixed_point int_blue_y)); 2384#endif 2385#endif 2386 2387#ifdef PNG_gAMA_SUPPORTED 2388#ifdef PNG_FLOATING_POINT_SUPPORTED 2389extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2390 png_infop info_ptr, double *file_gamma)); 2391#endif 2392extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2393 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2394#endif 2395 2396#ifdef PNG_gAMA_SUPPORTED 2397#ifdef PNG_FLOATING_POINT_SUPPORTED 2398extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2399 png_infop info_ptr, double file_gamma)); 2400#endif 2401extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2402 png_infop info_ptr, png_fixed_point int_file_gamma)); 2403#endif 2404 2405#ifdef PNG_hIST_SUPPORTED 2406extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2407 png_infop info_ptr, png_uint_16p *hist)); 2408#endif 2409 2410#ifdef PNG_hIST_SUPPORTED 2411extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2412 png_infop info_ptr, png_uint_16p hist)); 2413#endif 2414 2415extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2416 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2417 int *bit_depth, int *color_type, int *interlace_method, 2418 int *compression_method, int *filter_method)); 2419 2420extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2421 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2422 int color_type, int interlace_method, int compression_method, 2423 int filter_method)); 2424 2425#ifdef PNG_oFFs_SUPPORTED 2426extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2427 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2428 int *unit_type)); 2429#endif 2430 2431#ifdef PNG_oFFs_SUPPORTED 2432extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2433 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2434 int unit_type)); 2435#endif 2436 2437#ifdef PNG_pCAL_SUPPORTED 2438extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2439 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2440 int *type, int *nparams, png_charp *units, png_charpp *params)); 2441#endif 2442 2443#ifdef PNG_pCAL_SUPPORTED 2444extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2445 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2446 int type, int nparams, png_charp units, png_charpp params)); 2447#endif 2448 2449#ifdef PNG_pHYs_SUPPORTED 2450extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2451 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2452#endif 2453 2454#ifdef PNG_pHYs_SUPPORTED 2455extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2456 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2457#endif 2458 2459extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2460 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2461 2462extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2463 png_infop info_ptr, png_colorp palette, int num_palette)); 2464 2465#ifdef PNG_sBIT_SUPPORTED 2466extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2467 png_infop info_ptr, png_color_8p *sig_bit)); 2468#endif 2469 2470#ifdef PNG_sBIT_SUPPORTED 2471extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2472 png_infop info_ptr, png_color_8p sig_bit)); 2473#endif 2474 2475#ifdef PNG_sRGB_SUPPORTED 2476extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2477 png_infop info_ptr, int *intent)); 2478#endif 2479 2480#ifdef PNG_sRGB_SUPPORTED 2481extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2482 png_infop info_ptr, int intent)); 2483extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2484 png_infop info_ptr, int intent)); 2485#endif 2486 2487#ifdef PNG_iCCP_SUPPORTED 2488extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2489 png_infop info_ptr, png_charpp name, int *compression_type, 2490 png_charpp profile, png_uint_32 *proflen)); 2491 /* Note to maintainer: profile should be png_bytepp */ 2492#endif 2493 2494#ifdef PNG_iCCP_SUPPORTED 2495extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2496 png_infop info_ptr, png_charp name, int compression_type, 2497 png_charp profile, png_uint_32 proflen)); 2498 /* Note to maintainer: profile should be png_bytep */ 2499#endif 2500 2501#ifdef PNG_sPLT_SUPPORTED 2502extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2503 png_infop info_ptr, png_sPLT_tpp entries)); 2504#endif 2505 2506#ifdef PNG_sPLT_SUPPORTED 2507extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2508 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2509#endif 2510 2511#ifdef PNG_TEXT_SUPPORTED 2512/* png_get_text also returns the number of text chunks in *num_text */ 2513extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2514 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2515#endif 2516 2517/* 2518 * Note while png_set_text() will accept a structure whose text, 2519 * language, and translated keywords are NULL pointers, the structure 2520 * returned by png_get_text will always contain regular 2521 * zero-terminated C strings. They might be empty strings but 2522 * they will never be NULL pointers. 2523 */ 2524 2525#ifdef PNG_TEXT_SUPPORTED 2526extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2527 png_infop info_ptr, png_textp text_ptr, int num_text)); 2528#endif 2529 2530#ifdef PNG_tIME_SUPPORTED 2531extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2532 png_infop info_ptr, png_timep *mod_time)); 2533#endif 2534 2535#ifdef PNG_tIME_SUPPORTED 2536extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2537 png_infop info_ptr, png_timep mod_time)); 2538#endif 2539 2540#ifdef PNG_tRNS_SUPPORTED 2541extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2542 png_infop info_ptr, png_bytep *trans, int *num_trans, 2543 png_color_16p *trans_values)); 2544#endif 2545 2546#ifdef PNG_tRNS_SUPPORTED 2547extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2548 png_infop info_ptr, png_bytep trans, int num_trans, 2549 png_color_16p trans_values)); 2550#endif 2551 2552#ifdef PNG_tRNS_SUPPORTED 2553#endif 2554 2555#ifdef PNG_sCAL_SUPPORTED 2556#ifdef PNG_FLOATING_POINT_SUPPORTED 2557extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2558 png_infop info_ptr, int *unit, double *width, double *height)); 2559#else 2560#ifdef PNG_FIXED_POINT_SUPPORTED 2561extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2562 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2563#endif 2564#endif 2565#endif /* PNG_sCAL_SUPPORTED */ 2566 2567#ifdef PNG_sCAL_SUPPORTED 2568#ifdef PNG_FLOATING_POINT_SUPPORTED 2569extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2570 png_infop info_ptr, int unit, double width, double height)); 2571#else 2572#ifdef PNG_FIXED_POINT_SUPPORTED 2573extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2574 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2575#endif 2576#endif 2577#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2578 2579#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2580/* Provide a list of chunks and how they are to be handled, if the built-in 2581 handling or default unknown chunk handling is not desired. Any chunks not 2582 listed will be handled in the default manner. The IHDR and IEND chunks 2583 must not be listed. 2584 keep = 0: follow default behaviour 2585 = 1: do not keep 2586 = 2: keep only if safe-to-copy 2587 = 3: keep even if unsafe-to-copy 2588*/ 2589extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2590 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2591PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2592 chunk_name)); 2593#endif 2594#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2595extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2596 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2597extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2598 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2599extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2600 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2601#endif 2602 2603/* Png_free_data() will turn off the "valid" flag for anything it frees. 2604 * If you need to turn it off for a chunk that your application has freed, 2605 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2606 */ 2607extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2608 png_infop info_ptr, int mask)); 2609 2610#ifdef PNG_INFO_IMAGE_SUPPORTED 2611/* The "params" pointer is currently not used and is for future expansion. */ 2612extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2613 png_infop info_ptr, 2614 int transforms, 2615 png_voidp params)); 2616extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2617 png_infop info_ptr, 2618 int transforms, 2619 png_voidp params)); 2620#endif 2621 2622/* Define PNG_DEBUG at compile time for debugging information. Higher 2623 * numbers for PNG_DEBUG mean more debugging information. This has 2624 * only been added since version 0.95 so it is not implemented throughout 2625 * libpng yet, but more support will be added as needed. 2626 */ 2627#ifdef PNG_DEBUG 2628#if (PNG_DEBUG > 0) 2629#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2630#include <crtdbg.h> 2631#if (PNG_DEBUG > 1) 2632#ifndef _DEBUG 2633# define _DEBUG 2634#endif 2635#ifndef png_debug 2636#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2637#endif 2638#ifndef png_debug1 2639#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2640#endif 2641#ifndef png_debug2 2642#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2643#endif 2644#endif 2645#else /* PNG_DEBUG_FILE || !_MSC_VER */ 2646#ifndef PNG_DEBUG_FILE 2647#define PNG_DEBUG_FILE stderr 2648#endif /* PNG_DEBUG_FILE */ 2649 2650#if (PNG_DEBUG > 1) 2651/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2652 * compilers. 2653 */ 2654# ifdef __STDC__ 2655# ifndef png_debug 2656# define png_debug(l,m) \ 2657 { \ 2658 int num_tabs=l; \ 2659 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2660 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2661 } 2662# endif 2663# ifndef png_debug1 2664# define png_debug1(l,m,p1) \ 2665 { \ 2666 int num_tabs=l; \ 2667 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2668 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2669 } 2670# endif 2671# ifndef png_debug2 2672# define png_debug2(l,m,p1,p2) \ 2673 { \ 2674 int num_tabs=l; \ 2675 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2676 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2677 } 2678# endif 2679# else /* __STDC __ */ 2680# ifndef png_debug 2681# define png_debug(l,m) \ 2682 { \ 2683 int num_tabs=l; \ 2684 char format[256]; \ 2685 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2686 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2687 m,PNG_STRING_NEWLINE); \ 2688 fprintf(PNG_DEBUG_FILE,format); \ 2689 } 2690# endif 2691# ifndef png_debug1 2692# define png_debug1(l,m,p1) \ 2693 { \ 2694 int num_tabs=l; \ 2695 char format[256]; \ 2696 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2697 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2698 m,PNG_STRING_NEWLINE); \ 2699 fprintf(PNG_DEBUG_FILE,format,p1); \ 2700 } 2701# endif 2702# ifndef png_debug2 2703# define png_debug2(l,m,p1,p2) \ 2704 { \ 2705 int num_tabs=l; \ 2706 char format[256]; \ 2707 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2708 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2709 m,PNG_STRING_NEWLINE); \ 2710 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2711 } 2712# endif 2713# endif /* __STDC __ */ 2714#endif /* (PNG_DEBUG > 1) */ 2715 2716#endif /* _MSC_VER */ 2717#endif /* (PNG_DEBUG > 0) */ 2718#endif /* PNG_DEBUG */ 2719#ifndef png_debug 2720#define png_debug(l, m) 2721#endif 2722#ifndef png_debug1 2723#define png_debug1(l, m, p1) 2724#endif 2725#ifndef png_debug2 2726#define png_debug2(l, m, p1, p2) 2727#endif 2728 2729extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2730extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2731extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2732extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2733 2734#ifdef PNG_MNG_FEATURES_SUPPORTED 2735extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2736 png_ptr, png_uint_32 mng_features_permitted)); 2737#endif 2738 2739/* For use in png_set_keep_unknown, added to version 1.2.6 */ 2740#define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2741#define PNG_HANDLE_CHUNK_NEVER 1 2742#define PNG_HANDLE_CHUNK_IF_SAFE 2 2743#define PNG_HANDLE_CHUNK_ALWAYS 3 2744 2745/* Added to version 1.2.0 */ 2746#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2747#ifdef PNG_MMX_CODE_SUPPORTED 2748#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2749#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2750#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2751#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2752#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2753#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2754#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2755#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2756#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2757 2758#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2759 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2760 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2761 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2762 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2763 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2764#define PNG_MMX_WRITE_FLAGS ( 0 ) 2765 2766#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2767 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2768 | PNG_MMX_READ_FLAGS \ 2769 | PNG_MMX_WRITE_FLAGS ) 2770 2771#define PNG_SELECT_READ 1 2772#define PNG_SELECT_WRITE 2 2773#endif /* PNG_MMX_CODE_SUPPORTED */ 2774 2775#ifndef PNG_1_0_X 2776/* pngget.c */ 2777extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2778 PNGARG((int flag_select, int *compilerID)); 2779 2780/* pngget.c */ 2781extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2782 PNGARG((int flag_select)); 2783 2784/* pngget.c */ 2785extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2786 PNGARG((png_structp png_ptr)); 2787 2788/* pngget.c */ 2789extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2790 PNGARG((png_structp png_ptr)); 2791 2792/* pngget.c */ 2793extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2794 PNGARG((png_structp png_ptr)); 2795 2796/* pngset.c */ 2797extern PNG_EXPORT(void,png_set_asm_flags) 2798 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2799 2800/* pngset.c */ 2801extern PNG_EXPORT(void,png_set_mmx_thresholds) 2802 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2803 png_uint_32 mmx_rowbytes_threshold)); 2804 2805#endif /* PNG_1_0_X */ 2806 2807#ifndef PNG_1_0_X 2808/* png.c, pnggccrd.c, or pngvcrd.c */ 2809extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2810#endif /* PNG_1_0_X */ 2811#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2812 2813/* Strip the prepended error numbers ("#nnn ") from error and warning 2814 * messages before passing them to the error or warning handler. 2815 */ 2816#ifdef PNG_ERROR_NUMBERS_SUPPORTED 2817extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2818 png_ptr, png_uint_32 strip_mode)); 2819#endif 2820 2821/* Added at libpng-1.2.6 */ 2822#ifdef PNG_SET_USER_LIMITS_SUPPORTED 2823extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2824 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2825extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2826 png_ptr)); 2827extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2828 png_ptr)); 2829#endif 2830/* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2831 * project defs 2832 */ 2833 2834#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2835/* With these routines we avoid an integer divide, which will be slower on 2836 * most machines. However, it does take more operations than the corresponding 2837 * divide method, so it may be slower on a few RISC systems. There are two 2838 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2839 * 2840 * Note that the rounding factors are NOT supposed to be the same! 128 and 2841 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2842 * standard method. 2843 * 2844 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2845 */ 2846 2847 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2848 2849# define png_composite(composite, fg, alpha, bg) \ 2850 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2851 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2852 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2853 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2854 2855# define png_composite_16(composite, fg, alpha, bg) \ 2856 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2857 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2858 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2859 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2860 2861#else /* Standard method using integer division */ 2862 2863# define png_composite(composite, fg, alpha, bg) \ 2864 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2865 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2866 (png_uint_16)127) / 255) 2867 2868# define png_composite_16(composite, fg, alpha, bg) \ 2869 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2870 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2871 (png_uint_32)32767) / (png_uint_32)65535L) 2872 2873#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2874 2875/* Inline macros to do direct reads of bytes from the input buffer. These 2876 * require that you are using an architecture that uses PNG byte ordering 2877 * (MSB first) and supports unaligned data storage. I think that PowerPC 2878 * in big-endian mode and 680x0 are the only ones that will support this. 2879 * The x86 line of processors definitely do not. The png_get_int_32() 2880 * routine also assumes we are using two's complement format for negative 2881 * values, which is almost certainly true. 2882 */ 2883#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2884# define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2885# define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2886# define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2887#else 2888extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2889extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2890extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2891#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2892extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2893 PNGARG((png_structp png_ptr, png_bytep buf)); 2894/* No png_get_int_16 -- may be added if there's a real need for it. */ 2895 2896/* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2897 */ 2898extern PNG_EXPORT(void,png_save_uint_32) 2899 PNGARG((png_bytep buf, png_uint_32 i)); 2900extern PNG_EXPORT(void,png_save_int_32) 2901 PNGARG((png_bytep buf, png_int_32 i)); 2902 2903/* Place a 16-bit number into a buffer in PNG byte order. 2904 * The parameter is declared unsigned int, not png_uint_16, 2905 * just to avoid potential problems on pre-ANSI C compilers. 2906 */ 2907extern PNG_EXPORT(void,png_save_uint_16) 2908 PNGARG((png_bytep buf, unsigned int i)); 2909/* No png_save_int_16 -- may be added if there's a real need for it. */ 2910 2911/* ************************************************************************* */ 2912 2913/* These next functions are used internally in the code. They generally 2914 * shouldn't be used unless you are writing code to add or replace some 2915 * functionality in libpng. More information about most functions can 2916 * be found in the files where the functions are located. 2917 */ 2918 2919 2920/* Various modes of operation, that are visible to applications because 2921 * they are used for unknown chunk location. 2922 */ 2923#define PNG_HAVE_IHDR 0x01 2924#define PNG_HAVE_PLTE 0x02 2925#define PNG_HAVE_IDAT 0x04 2926#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2927#define PNG_HAVE_IEND 0x10 2928 2929#ifdef PNG_INTERNAL 2930 2931/* More modes of operation. Note that after an init, mode is set to 2932 * zero automatically when the structure is created. 2933 */ 2934#define PNG_HAVE_gAMA 0x20 2935#define PNG_HAVE_cHRM 0x40 2936#define PNG_HAVE_sRGB 0x80 2937#define PNG_HAVE_CHUNK_HEADER 0x100 2938#define PNG_WROTE_tIME 0x200 2939#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2940#define PNG_BACKGROUND_IS_GRAY 0x800 2941#define PNG_HAVE_PNG_SIGNATURE 0x1000 2942#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2943 2944/* Flags for the transformations the PNG library does on the image data */ 2945#define PNG_BGR 0x0001 2946#define PNG_INTERLACE 0x0002 2947#define PNG_PACK 0x0004 2948#define PNG_SHIFT 0x0008 2949#define PNG_SWAP_BYTES 0x0010 2950#define PNG_INVERT_MONO 0x0020 2951#define PNG_DITHER 0x0040 2952#define PNG_BACKGROUND 0x0080 2953#define PNG_BACKGROUND_EXPAND 0x0100 2954 /* 0x0200 unused */ 2955#define PNG_16_TO_8 0x0400 2956#define PNG_RGBA 0x0800 2957#define PNG_EXPAND 0x1000 2958#define PNG_GAMMA 0x2000 2959#define PNG_GRAY_TO_RGB 0x4000 2960#define PNG_FILLER 0x8000L 2961#define PNG_PACKSWAP 0x10000L 2962#define PNG_SWAP_ALPHA 0x20000L 2963#define PNG_STRIP_ALPHA 0x40000L 2964#define PNG_INVERT_ALPHA 0x80000L 2965#define PNG_USER_TRANSFORM 0x100000L 2966#define PNG_RGB_TO_GRAY_ERR 0x200000L 2967#define PNG_RGB_TO_GRAY_WARN 0x400000L 2968#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2969 /* 0x800000L Unused */ 2970#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2971#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2972#define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 2973 /* by volker */ 2974 /* 0x8000000L unused */ 2975 /* 0x10000000L unused */ 2976 /* 0x20000000L unused */ 2977 /* 0x40000000L unused */ 2978 2979/* Flags for png_create_struct */ 2980#define PNG_STRUCT_PNG 0x0001 2981#define PNG_STRUCT_INFO 0x0002 2982 2983/* Scaling factor for filter heuristic weighting calculations */ 2984#define PNG_WEIGHT_SHIFT 8 2985#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2986#define PNG_COST_SHIFT 3 2987#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2988 2989/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2990#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2991#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2992#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2993#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2994#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2995#define PNG_FLAG_ZLIB_FINISHED 0x0020 2996#define PNG_FLAG_ROW_INIT 0x0040 2997#define PNG_FLAG_FILLER_AFTER 0x0080 2998#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2999#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 3000#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 3001#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 3002#define PNG_FLAG_FREE_PLTE 0x1000 3003#define PNG_FLAG_FREE_TRNS 0x2000 3004#define PNG_FLAG_FREE_HIST 0x4000 3005#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 3006#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 3007#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 3008#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 3009#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 3010#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 3011#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 3012#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 3013 /* 0x800000L unused */ 3014 /* 0x1000000L unused */ 3015 /* 0x2000000L unused */ 3016 /* 0x4000000L unused */ 3017 /* 0x8000000L unused */ 3018 /* 0x10000000L unused */ 3019 /* 0x20000000L unused */ 3020 /* 0x40000000L unused */ 3021 3022#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3023 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3024 3025#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3026 PNG_FLAG_CRC_CRITICAL_IGNORE) 3027 3028#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3029 PNG_FLAG_CRC_CRITICAL_MASK) 3030 3031/* Save typing and make code easier to understand */ 3032 3033#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3034 abs((int)((c1).green) - (int)((c2).green)) + \ 3035 abs((int)((c1).blue) - (int)((c2).blue))) 3036 3037/* Added to libpng-1.2.6 JB */ 3038#define PNG_ROWBYTES(pixel_bits, width) \ 3039 ((pixel_bits) >= 8 ? \ 3040 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3041 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3042 3043/* PNG_OUT_OF_RANGE returns true if value is outside the range 3044 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3045 * "ideal" and "delta" should be constants, normally simple 3046 * integers, "value" a variable. Added to libpng-1.2.6 JB 3047 */ 3048#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3049 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3050 3051/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3052#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3053/* Place to hold the signature string for a PNG file. */ 3054#ifdef PNG_USE_GLOBAL_ARRAYS 3055 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3056#else 3057#endif 3058#endif /* PNG_NO_EXTERN */ 3059 3060/* Constant strings for known chunk types. If you need to add a chunk, 3061 * define the name here, and add an invocation of the macro in png.c and 3062 * wherever it's needed. 3063 */ 3064#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3065#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3066#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3067#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3068#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3069#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3070#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3071#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3072#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3073#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3074#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3075#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3076#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3077#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3078#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3079#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3080#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3081#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3082#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3083#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3084#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3085 3086#ifdef PNG_USE_GLOBAL_ARRAYS 3087PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3088PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3089PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3090PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3091PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3092PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3093PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3094PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3095PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3096PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3097PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3098PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3099PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3100PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3101PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3102PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3103PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3104PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3105PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3106PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3107PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3108#endif /* PNG_USE_GLOBAL_ARRAYS */ 3109 3110#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3111/* Initialize png_ptr struct for reading, and allocate any other memory. 3112 * (old interface - DEPRECATED - use png_create_read_struct instead). 3113 */ 3114extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3115 PNG_DEPRECATED; 3116#undef png_read_init 3117#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3118 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3119#endif 3120 3121extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3122 png_const_charp user_png_ver, png_size_t png_struct_size)); 3123#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3124extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3125 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3126 png_info_size)); 3127#endif 3128 3129#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3130/* Initialize png_ptr struct for writing, and allocate any other memory. 3131 * (old interface - DEPRECATED - use png_create_write_struct instead). 3132 */ 3133extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3134 PNG_DEPRECATED; 3135#undef png_write_init 3136#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3137 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3138#endif 3139 3140extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3141 png_const_charp user_png_ver, png_size_t png_struct_size)); 3142extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3143 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3144 png_info_size)); 3145 3146/* Allocate memory for an internal libpng struct */ 3147PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3148 3149/* Free memory from internal libpng struct */ 3150PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3151 3152PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3153 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3154PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3155 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3156 3157/* Free any memory that info_ptr points to and reset struct. */ 3158PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3159 png_infop info_ptr)) PNG_PRIVATE; 3160 3161#ifndef PNG_1_0_X 3162/* Function to allocate memory for zlib. */ 3163PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3164 uInt size)) PNG_PRIVATE; 3165 3166/* Function to free memory for zlib */ 3167PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3168 3169#ifdef PNG_SIZE_T 3170/* Function to convert a sizeof an item to png_sizeof item */ 3171 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3172 PNG_PRIVATE; 3173#endif 3174 3175/* Next four functions are used internally as callbacks. PNGAPI is required 3176 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3177 */ 3178 3179PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3180 png_bytep data, png_size_t length)) PNG_PRIVATE; 3181 3182#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3183PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3184 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3185#endif 3186 3187PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3188 png_bytep data, png_size_t length)) PNG_PRIVATE; 3189 3190#ifdef PNG_WRITE_FLUSH_SUPPORTED 3191#ifdef PNG_STDIO_SUPPORTED 3192PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3193 PNG_PRIVATE; 3194#endif 3195#endif 3196#else /* PNG_1_0_X */ 3197#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3198PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3199 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3200#endif 3201#endif /* PNG_1_0_X */ 3202 3203/* Reset the CRC variable */ 3204PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3205 3206/* Write the "data" buffer to whatever output you are using. */ 3207PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3208 png_size_t length)) PNG_PRIVATE; 3209 3210/* Read data from whatever input you are using into the "data" buffer */ 3211PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3212 png_size_t length)) PNG_PRIVATE; 3213 3214/* Read bytes into buf, and update png_ptr->crc */ 3215PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3216 png_size_t length)) PNG_PRIVATE; 3217 3218/* Decompress data in a chunk that uses compression */ 3219#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3220 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3221PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3222 int comp_type, png_size_t chunklength, 3223 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3224#endif 3225 3226/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3227PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3228 PNG_PRIVATE); 3229 3230/* Read the CRC from the file and compare it to the libpng calculated CRC */ 3231PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3232 3233/* Calculate the CRC over a section of data. Note that we are only 3234 * passing a maximum of 64K on systems that have this as a memory limit, 3235 * since this is the maximum buffer size we can specify. 3236 */ 3237PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3238 png_size_t length)) PNG_PRIVATE; 3239 3240#ifdef PNG_WRITE_FLUSH_SUPPORTED 3241PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3242#endif 3243 3244/* Simple function to write the signature */ 3245PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3246 3247/* Write various chunks */ 3248 3249/* Write the IHDR chunk, and update the png_struct with the necessary 3250 * information. 3251 */ 3252PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3253 png_uint_32 height, 3254 int bit_depth, int color_type, int compression_method, int filter_method, 3255 int interlace_method)) PNG_PRIVATE; 3256 3257PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3258 png_uint_32 num_pal)) PNG_PRIVATE; 3259 3260PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3261 png_size_t length)) PNG_PRIVATE; 3262 3263PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3264 3265#ifdef PNG_WRITE_gAMA_SUPPORTED 3266#ifdef PNG_FLOATING_POINT_SUPPORTED 3267PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3268 PNG_PRIVATE; 3269#endif 3270#ifdef PNG_FIXED_POINT_SUPPORTED 3271PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3272 png_fixed_point file_gamma)) PNG_PRIVATE; 3273#endif 3274#endif 3275 3276#ifdef PNG_WRITE_sBIT_SUPPORTED 3277PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3278 int color_type)) PNG_PRIVATE; 3279#endif 3280 3281#ifdef PNG_WRITE_cHRM_SUPPORTED 3282#ifdef PNG_FLOATING_POINT_SUPPORTED 3283PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3284 double white_x, double white_y, 3285 double red_x, double red_y, double green_x, double green_y, 3286 double blue_x, double blue_y)) PNG_PRIVATE; 3287#endif 3288#ifdef PNG_FIXED_POINT_SUPPORTED 3289PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3290 png_fixed_point int_white_x, png_fixed_point int_white_y, 3291 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3292 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3293 png_fixed_point int_blue_y)) PNG_PRIVATE; 3294#endif 3295#endif 3296 3297#ifdef PNG_WRITE_sRGB_SUPPORTED 3298PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3299 int intent)) PNG_PRIVATE; 3300#endif 3301 3302#ifdef PNG_WRITE_iCCP_SUPPORTED 3303PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3304 png_charp name, int compression_type, 3305 png_charp profile, int proflen)) PNG_PRIVATE; 3306 /* Note to maintainer: profile should be png_bytep */ 3307#endif 3308 3309#ifdef PNG_WRITE_sPLT_SUPPORTED 3310PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3311 png_sPLT_tp palette)) PNG_PRIVATE; 3312#endif 3313 3314#ifdef PNG_WRITE_tRNS_SUPPORTED 3315PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3316 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3317#endif 3318 3319#ifdef PNG_WRITE_bKGD_SUPPORTED 3320PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3321 png_color_16p values, int color_type)) PNG_PRIVATE; 3322#endif 3323 3324#ifdef PNG_WRITE_hIST_SUPPORTED 3325PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3326 int num_hist)) PNG_PRIVATE; 3327#endif 3328 3329#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3330 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3331PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3332 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3333#endif 3334 3335#ifdef PNG_WRITE_tEXt_SUPPORTED 3336PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3337 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3338#endif 3339 3340#ifdef PNG_WRITE_zTXt_SUPPORTED 3341PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3342 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3343#endif 3344 3345#ifdef PNG_WRITE_iTXt_SUPPORTED 3346PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3347 int compression, png_charp key, png_charp lang, png_charp lang_key, 3348 png_charp text)) PNG_PRIVATE; 3349#endif 3350 3351#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3352PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3353 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3354#endif 3355 3356#ifdef PNG_WRITE_oFFs_SUPPORTED 3357PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3358 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3359#endif 3360 3361#ifdef PNG_WRITE_pCAL_SUPPORTED 3362PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3363 png_int_32 X0, png_int_32 X1, int type, int nparams, 3364 png_charp units, png_charpp params)) PNG_PRIVATE; 3365#endif 3366 3367#ifdef PNG_WRITE_pHYs_SUPPORTED 3368PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3369 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3370 int unit_type)) PNG_PRIVATE; 3371#endif 3372 3373#ifdef PNG_WRITE_tIME_SUPPORTED 3374PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3375 png_timep mod_time)) PNG_PRIVATE; 3376#endif 3377 3378#ifdef PNG_WRITE_sCAL_SUPPORTED 3379#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3380PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3381 int unit, double width, double height)) PNG_PRIVATE; 3382#else 3383#ifdef PNG_FIXED_POINT_SUPPORTED 3384PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3385 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3386#endif 3387#endif 3388#endif 3389 3390/* Called when finished processing a row of data */ 3391PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3392 3393/* Internal use only. Called before first row of data */ 3394PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3395 3396#ifdef PNG_READ_GAMMA_SUPPORTED 3397PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3398#endif 3399 3400/* Combine a row of data, dealing with alpha, etc. if requested */ 3401PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3402 int mask)) PNG_PRIVATE; 3403 3404#ifdef PNG_READ_INTERLACING_SUPPORTED 3405/* Expand an interlaced row */ 3406/* OLD pre-1.0.9 interface: 3407PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3408 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3409 */ 3410PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3411#endif 3412 3413/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3414 3415#ifdef PNG_WRITE_INTERLACING_SUPPORTED 3416/* Grab pixels out of a row for an interlaced pass */ 3417PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3418 png_bytep row, int pass)) PNG_PRIVATE; 3419#endif 3420 3421/* Unfilter a row */ 3422PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3423 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3424 int filter)) PNG_PRIVATE; 3425 3426/* Choose the best filter to use and filter the row data */ 3427PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3428 png_row_infop row_info)) PNG_PRIVATE; 3429 3430/* Write out the filtered row. */ 3431PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3432 png_bytep filtered_row)) PNG_PRIVATE; 3433/* Finish a row while reading, dealing with interlacing passes, etc. */ 3434PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3435 3436/* Initialize the row buffers, etc. */ 3437PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3438/* Optional call to update the users info structure */ 3439PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3440 png_infop info_ptr)) PNG_PRIVATE; 3441 3442/* These are the functions that do the transformations */ 3443#ifdef PNG_READ_FILLER_SUPPORTED 3444PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3445 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3446#endif 3447 3448#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3449PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3450 png_bytep row)) PNG_PRIVATE; 3451#endif 3452 3453#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3454PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3455 png_bytep row)) PNG_PRIVATE; 3456#endif 3457 3458#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3459PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3460 png_bytep row)) PNG_PRIVATE; 3461#endif 3462 3463#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3464PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3465 png_bytep row)) PNG_PRIVATE; 3466#endif 3467 3468#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3469 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3470PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3471 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3472#endif 3473 3474#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3475PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3476 png_bytep row)) PNG_PRIVATE; 3477#endif 3478 3479#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3480PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3481 png_bytep row)) PNG_PRIVATE; 3482#endif 3483 3484#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3485PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3486 row_info, png_bytep row)) PNG_PRIVATE; 3487#endif 3488 3489#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3490PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3491 png_bytep row)) PNG_PRIVATE; 3492#endif 3493 3494#ifdef PNG_READ_PACK_SUPPORTED 3495PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3496 png_bytep row)) PNG_PRIVATE; 3497#endif 3498 3499#ifdef PNG_READ_SHIFT_SUPPORTED 3500PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3501 png_color_8p sig_bits)) PNG_PRIVATE; 3502#endif 3503 3504#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3505PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3506 png_bytep row)) PNG_PRIVATE; 3507#endif 3508 3509#ifdef PNG_READ_16_TO_8_SUPPORTED 3510PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3511 png_bytep row)) PNG_PRIVATE; 3512#endif 3513 3514#ifdef PNG_READ_DITHER_SUPPORTED 3515PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3516 png_bytep row, png_bytep palette_lookup, 3517 png_bytep dither_lookup)) PNG_PRIVATE; 3518 3519# ifdef PNG_CORRECT_PALETTE_SUPPORTED 3520PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3521 png_colorp palette, int num_palette)) PNG_PRIVATE; 3522# endif 3523#endif 3524 3525#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3526PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3527 png_bytep row)) PNG_PRIVATE; 3528#endif 3529 3530#ifdef PNG_WRITE_PACK_SUPPORTED 3531PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3532 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3533#endif 3534 3535#ifdef PNG_WRITE_SHIFT_SUPPORTED 3536PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3537 png_color_8p bit_depth)) PNG_PRIVATE; 3538#endif 3539 3540#ifdef PNG_READ_BACKGROUND_SUPPORTED 3541#ifdef PNG_READ_GAMMA_SUPPORTED 3542PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3543 png_color_16p trans_values, png_color_16p background, 3544 png_color_16p background_1, 3545 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3546 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3547 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3548#else 3549PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3550 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3551#endif 3552#endif 3553 3554#ifdef PNG_READ_GAMMA_SUPPORTED 3555PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3556 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3557 int gamma_shift)) PNG_PRIVATE; 3558#endif 3559 3560#ifdef PNG_READ_EXPAND_SUPPORTED 3561PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3562 png_bytep row, png_colorp palette, png_bytep trans, 3563 int num_trans)) PNG_PRIVATE; 3564PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3565 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3566#endif 3567 3568/* The following decodes the appropriate chunks, and does error correction, 3569 * then calls the appropriate callback for the chunk if it is valid. 3570 */ 3571 3572/* Decode the IHDR chunk */ 3573PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3574 png_uint_32 length)) PNG_PRIVATE; 3575PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3576 png_uint_32 length)); 3577PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3578 png_uint_32 length)); 3579 3580#ifdef PNG_READ_bKGD_SUPPORTED 3581PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3582 png_uint_32 length)) PNG_PRIVATE; 3583#endif 3584 3585#ifdef PNG_READ_cHRM_SUPPORTED 3586PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3587 png_uint_32 length)) PNG_PRIVATE; 3588#endif 3589 3590#ifdef PNG_READ_gAMA_SUPPORTED 3591PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3592 png_uint_32 length)) PNG_PRIVATE; 3593#endif 3594 3595#ifdef PNG_READ_hIST_SUPPORTED 3596PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3597 png_uint_32 length)) PNG_PRIVATE; 3598#endif 3599 3600#ifdef PNG_READ_iCCP_SUPPORTED 3601extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3602 png_uint_32 length)); 3603#endif /* PNG_READ_iCCP_SUPPORTED */ 3604 3605#ifdef PNG_READ_iTXt_SUPPORTED 3606PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3607 png_uint_32 length)) PNG_PRIVATE; 3608#endif 3609 3610#ifdef PNG_READ_oFFs_SUPPORTED 3611PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3612 png_uint_32 length)) PNG_PRIVATE; 3613#endif 3614 3615#ifdef PNG_READ_pCAL_SUPPORTED 3616PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3617 png_uint_32 length)) PNG_PRIVATE; 3618#endif 3619 3620#ifdef PNG_READ_pHYs_SUPPORTED 3621PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3622 png_uint_32 length)) PNG_PRIVATE; 3623#endif 3624 3625#ifdef PNG_READ_sBIT_SUPPORTED 3626PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3627 png_uint_32 length)) PNG_PRIVATE; 3628#endif 3629 3630#ifdef PNG_READ_sCAL_SUPPORTED 3631PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3632 png_uint_32 length)) PNG_PRIVATE; 3633#endif 3634 3635#ifdef PNG_READ_sPLT_SUPPORTED 3636extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3637 png_uint_32 length)) PNG_PRIVATE; 3638#endif /* PNG_READ_sPLT_SUPPORTED */ 3639 3640#ifdef PNG_READ_sRGB_SUPPORTED 3641PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3642 png_uint_32 length)) PNG_PRIVATE; 3643#endif 3644 3645#ifdef PNG_READ_tEXt_SUPPORTED 3646PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3647 png_uint_32 length)) PNG_PRIVATE; 3648#endif 3649 3650#ifdef PNG_READ_tIME_SUPPORTED 3651PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3652 png_uint_32 length)) PNG_PRIVATE; 3653#endif 3654 3655#ifdef PNG_READ_tRNS_SUPPORTED 3656PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3657 png_uint_32 length)) PNG_PRIVATE; 3658#endif 3659 3660#ifdef PNG_READ_zTXt_SUPPORTED 3661PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3662 png_uint_32 length)) PNG_PRIVATE; 3663#endif 3664 3665PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3666 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3667 3668PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3669 png_bytep chunk_name)) PNG_PRIVATE; 3670 3671/* Handle the transformations for reading and writing */ 3672PNG_EXTERN void png_do_read_transformations 3673 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3674PNG_EXTERN void png_do_write_transformations 3675 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3676 3677PNG_EXTERN void png_init_read_transformations 3678 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3679 3680#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3681PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3682 png_infop info_ptr)) PNG_PRIVATE; 3683PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3684 png_infop info_ptr)) PNG_PRIVATE; 3685PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3686PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3687 png_uint_32 length)) PNG_PRIVATE; 3688PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3689PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3690PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3691 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3692PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3693PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3694 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3695PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3696PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3697 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3698PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3699 png_infop info_ptr)) PNG_PRIVATE; 3700PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3701 png_infop info_ptr)) PNG_PRIVATE; 3702PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3703 png_bytep row)) PNG_PRIVATE; 3704PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3705 png_infop info_ptr)) PNG_PRIVATE; 3706PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3707 png_infop info_ptr)) PNG_PRIVATE; 3708PNG_EXTERN void png_read_push_finish_row 3709 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3710#ifdef PNG_READ_tEXt_SUPPORTED 3711PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3712 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3713PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3714 png_infop info_ptr)) PNG_PRIVATE; 3715#endif 3716#ifdef PNG_READ_zTXt_SUPPORTED 3717PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3718 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3719PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3720 png_infop info_ptr)) PNG_PRIVATE; 3721#endif 3722#ifdef PNG_READ_iTXt_SUPPORTED 3723PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3724 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3725PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3726 png_infop info_ptr)) PNG_PRIVATE; 3727#endif 3728 3729#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3730 3731#ifdef PNG_MNG_FEATURES_SUPPORTED 3732PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3733 png_bytep row)) PNG_PRIVATE; 3734PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3735 png_bytep row)) PNG_PRIVATE; 3736#endif 3737 3738#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3739#ifdef PNG_MMX_CODE_SUPPORTED 3740/* png.c */ /* PRIVATE */ 3741PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3742#endif 3743#endif 3744 3745 3746/* The following six functions will be exported in libpng-1.4.0. */ 3747#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3748PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3749png_infop info_ptr)); 3750 3751PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3752png_infop info_ptr)); 3753 3754PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3755png_infop info_ptr)); 3756 3757PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3758png_infop info_ptr)); 3759 3760PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3761png_infop info_ptr)); 3762 3763#ifdef PNG_pHYs_SUPPORTED 3764PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3765png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3766#endif /* PNG_pHYs_SUPPORTED */ 3767#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3768 3769/* Read the chunk header (length + type name) */ 3770PNG_EXTERN png_uint_32 png_read_chunk_header 3771 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3772 3773/* Added at libpng version 1.2.34 */ 3774#ifdef PNG_cHRM_SUPPORTED 3775PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3776 png_fixed_point int_white_x, png_fixed_point int_white_y, 3777 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3778 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3779 png_fixed_point int_blue_y)) PNG_PRIVATE; 3780#endif 3781 3782#ifdef PNG_cHRM_SUPPORTED 3783#ifdef PNG_CHECK_cHRM_SUPPORTED 3784/* Added at libpng version 1.2.34 */ 3785PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3786 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3787#endif 3788#endif 3789 3790/* Added at libpng version 1.2.41 */ 3791PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3792 png_uint_32 width, png_uint_32 height, int bit_depth, 3793 int color_type, int interlace_type, int compression_type, 3794 int filter_type)) PNG_PRIVATE; 3795 3796/* Added at libpng version 1.2.41 */ 3797PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3798 png_uint_32 size)); 3799 3800/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3801 3802#endif /* PNG_INTERNAL */ 3803 3804#ifdef __cplusplus 3805} 3806#endif 3807 3808#endif /* PNG_VERSION_INFO_ONLY */ 3809/* Do not put anything past this line */ 3810#endif /* PNG_H */ 3811