1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.52 - November 20, 2014 4 * Copyright (c) 1998-2014 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 1.2.52 - November 20, 2014: 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 * 1.2.51beta01-05 13 10251 12.so.0.51[.0] 288 * 1.2.51rc01-04 13 10251 12.so.0.51[.0] 289 * 1.0.61 10 10061 10.so.0.61[.0] 290 * 1.2.51 13 10251 12.so.0.51[.0] 291 * 1.2.52beta01 13 10252 12.so.0.52[.0] 292 * 1.2.52rc01-02 13 10252 12.so.0.52[.0] 293 * 1.0.62 10 10062 10.so.0.62[.0] 294 * 1.2.52 13 10252 12.so.0.52[.0] 295 * 296 * Henceforth the source version will match the shared-library major 297 * and minor numbers; the shared-library major version number will be 298 * used for changes in backward compatibility, as it is intended. The 299 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 300 * for applications, is an unsigned integer of the form xyyzz corresponding 301 * to the source version x.y.z (leading zeros in y and z). Beta versions 302 * were given the previous public release number plus a letter, until 303 * version 1.0.6j; from then on they were given the upcoming public 304 * release number plus "betaNN" or "rcNN". 305 * 306 * Binary incompatibility exists only when applications make direct access 307 * to the info_ptr or png_ptr members through png.h, and the compiled 308 * application is loaded with a different version of the library. 309 * 310 * DLLNUM will change each time there are forward or backward changes 311 * in binary compatibility (e.g., when a new feature is added). 312 * 313 * See libpng.txt or libpng.3 for more information. The PNG specification 314 * is available as a W3C Recommendation and as an ISO Specification, 315 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 316 */ 317 318 /* 319 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 320 * 321 * If you modify libpng you may insert additional notices immediately following 322 * this sentence. 323 * 324 * This code is released under the libpng license. 325 * 326 * libpng versions 1.2.6, August 15, 2004, through 1.2.52, November 20, 2014, are 327 * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are 328 * distributed according to the same disclaimer and license as libpng-1.2.5 329 * with the following individual added to the list of Contributing Authors: 330 * 331 * Cosmin Truta 332 * 333 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 334 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 335 * distributed according to the same disclaimer and license as libpng-1.0.6 336 * with the following individuals added to the list of Contributing Authors: 337 * 338 * Simon-Pierre Cadieux 339 * Eric S. Raymond 340 * Gilles Vollant 341 * 342 * and with the following additions to the disclaimer: 343 * 344 * There is no warranty against interference with your enjoyment of the 345 * library or against infringement. There is no warranty that our 346 * efforts or the library will fulfill any of your particular purposes 347 * or needs. This library is provided with all faults, and the entire 348 * risk of satisfactory quality, performance, accuracy, and effort is with 349 * the user. 350 * 351 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 352 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 353 * distributed according to the same disclaimer and license as libpng-0.96, 354 * with the following individuals added to the list of Contributing Authors: 355 * 356 * Tom Lane 357 * Glenn Randers-Pehrson 358 * Willem van Schaik 359 * 360 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 361 * Copyright (c) 1996, 1997 Andreas Dilger 362 * Distributed according to the same disclaimer and license as libpng-0.88, 363 * with the following individuals added to the list of Contributing Authors: 364 * 365 * John Bowler 366 * Kevin Bracey 367 * Sam Bushell 368 * Magnus Holmgren 369 * Greg Roelofs 370 * Tom Tanner 371 * 372 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 373 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 374 * 375 * For the purposes of this copyright and license, "Contributing Authors" 376 * is defined as the following set of individuals: 377 * 378 * Andreas Dilger 379 * Dave Martindale 380 * Guy Eric Schalnat 381 * Paul Schmidt 382 * Tim Wegner 383 * 384 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 385 * and Group 42, Inc. disclaim all warranties, expressed or implied, 386 * including, without limitation, the warranties of merchantability and of 387 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 388 * assume no liability for direct, indirect, incidental, special, exemplary, 389 * or consequential damages, which may result from the use of the PNG 390 * Reference Library, even if advised of the possibility of such damage. 391 * 392 * Permission is hereby granted to use, copy, modify, and distribute this 393 * source code, or portions hereof, for any purpose, without fee, subject 394 * to the following restrictions: 395 * 396 * 1. The origin of this source code must not be misrepresented. 397 * 398 * 2. Altered versions must be plainly marked as such and 399 * must not be misrepresented as being the original source. 400 * 401 * 3. This Copyright notice may not be removed or altered from 402 * any source or altered source distribution. 403 * 404 * The Contributing Authors and Group 42, Inc. specifically permit, without 405 * fee, and encourage the use of this source code as a component to 406 * supporting the PNG file format in commercial products. If you use this 407 * source code in a product, acknowledgment is not required but would be 408 * appreciated. 409 */ 410 411 /* 412 * A "png_get_copyright" function is available, for convenient use in "about" 413 * boxes and the like: 414 * 415 * printf("%s",png_get_copyright(NULL)); 416 * 417 * Also, the PNG logo (in PNG format, of course) is supplied in the 418 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 419 */ 420 421 /* 422 * Libpng is OSI Certified Open Source Software. OSI Certified is a 423 * certification mark of the Open Source Initiative. 424 */ 425 426 /* 427 * The contributing authors would like to thank all those who helped 428 * with testing, bug fixes, and patience. This wouldn't have been 429 * possible without all of you. 430 * 431 * Thanks to Frank J. T. Wojcik for helping with the documentation. 432 */ 433 434 /* 435 * Y2K compliance in libpng: 436 * ========================= 437 * 438 * November 20, 2014 439 * 440 * Since the PNG Development group is an ad-hoc body, we can't make 441 * an official declaration. 442 * 443 * This is your unofficial assurance that libpng from version 0.71 and 444 * upward through 1.2.52 are Y2K compliant. It is my belief that earlier 445 * versions were also Y2K compliant. 446 * 447 * Libpng only has three year fields. One is a 2-byte unsigned integer 448 * that will hold years up to 65535. The other two hold the date in text 449 * format, and will hold years up to 9999. 450 * 451 * The integer is 452 * "png_uint_16 year" in png_time_struct. 453 * 454 * The strings are 455 * "png_charp time_buffer" in png_struct and 456 * "near_time_buffer", which is a local character string in png.c. 457 * 458 * There are seven time-related functions: 459 * png.c: png_convert_to_rfc_1123() in png.c 460 * (formerly png_convert_to_rfc_1152() in error) 461 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 462 * png_convert_from_time_t() in pngwrite.c 463 * png_get_tIME() in pngget.c 464 * png_handle_tIME() in pngrutil.c, called in pngread.c 465 * png_set_tIME() in pngset.c 466 * png_write_tIME() in pngwutil.c, called in pngwrite.c 467 * 468 * All handle dates properly in a Y2K environment. The 469 * png_convert_from_time_t() function calls gmtime() to convert from system 470 * clock time, which returns (year - 1900), which we properly convert to 471 * the full 4-digit year. There is a possibility that applications using 472 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 473 * function, or that they are incorrectly passing only a 2-digit year 474 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 475 * but this is not under our control. The libpng documentation has always 476 * stated that it works with 4-digit years, and the APIs have been 477 * documented as such. 478 * 479 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 480 * integer to hold the year, and can hold years as large as 65535. 481 * 482 * zlib, upon which libpng depends, is also Y2K compliant. It contains 483 * no date-related code. 484 * 485 * Glenn Randers-Pehrson 486 * libpng maintainer 487 * PNG Development Group 488 */ 489 490 #ifndef PNG_H 491 #define PNG_H 492 493 /* This is not the place to learn how to use libpng. The file libpng.txt 494 * describes how to use libpng, and the file example.c summarizes it 495 * with some code on which to build. This file is useful for looking 496 * at the actual function definitions and structure components. 497 */ 498 499 /* Version information for png.h - this should match the version in png.c */ 500 #define PNG_LIBPNG_VER_STRING "1.2.52" 501 #define PNG_HEADER_VERSION_STRING \ 502 " libpng version 1.2.52 - November 20, 2014\n" 503 504 #define PNG_LIBPNG_VER_SONUM 0 505 #define PNG_LIBPNG_VER_DLLNUM 13 506 507 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 508 #define PNG_LIBPNG_VER_MAJOR 1 509 #define PNG_LIBPNG_VER_MINOR 2 510 #define PNG_LIBPNG_VER_RELEASE 52 511 /* This should match the numeric part of the final component of 512 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 513 */ 514 515 #define PNG_LIBPNG_VER_BUILD 0 516 517 /* Release Status */ 518 #define PNG_LIBPNG_BUILD_ALPHA 1 519 #define PNG_LIBPNG_BUILD_BETA 2 520 #define PNG_LIBPNG_BUILD_RC 3 521 #define PNG_LIBPNG_BUILD_STABLE 4 522 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 523 524 /* Release-Specific Flags */ 525 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 526 PNG_LIBPNG_BUILD_STABLE only */ 527 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 528 PNG_LIBPNG_BUILD_SPECIAL */ 529 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 530 PNG_LIBPNG_BUILD_PRIVATE */ 531 532 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 533 534 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 535 * We must not include leading zeros. 536 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 537 * version 1.0.0 was mis-numbered 100 instead of 10000). From 538 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 539 */ 540 #define PNG_LIBPNG_VER 10252 /* 1.2.52 */ 541 542 #ifndef PNG_VERSION_INFO_ONLY 543 /* Include the compression library's header */ 544 #include "zlib.h" 545 #endif 546 547 /* Include all user configurable info, including optional assembler routines */ 548 #include "pngconf.h" 549 550 /* 551 * Added at libpng-1.2.8 */ 552 /* Ref MSDN: Private as priority over Special 553 * VS_FF_PRIVATEBUILD File *was not* built using standard release 554 * procedures. If this value is given, the StringFileInfo block must 555 * contain a PrivateBuild string. 556 * 557 * VS_FF_SPECIALBUILD File *was* built by the original company using 558 * standard release procedures but is a variation of the standard 559 * file of the same version number. If this value is given, the 560 * StringFileInfo block must contain a SpecialBuild string. 561 */ 562 563 #ifdef PNG_USER_PRIVATEBUILD 564 # define PNG_LIBPNG_BUILD_TYPE \ 565 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 566 #else 567 # ifdef PNG_LIBPNG_SPECIALBUILD 568 # define PNG_LIBPNG_BUILD_TYPE \ 569 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 570 # else 571 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 572 # endif 573 #endif 574 575 #ifndef PNG_VERSION_INFO_ONLY 576 577 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 578 #ifdef __cplusplus 579 extern "C" { 580 #endif /* __cplusplus */ 581 582 /* This file is arranged in several sections. The first section contains 583 * structure and type definitions. The second section contains the external 584 * library functions, while the third has the internal library functions, 585 * which applications aren't expected to use directly. 586 */ 587 588 #ifndef PNG_NO_TYPECAST_NULL 589 #define int_p_NULL (int *)NULL 590 #define png_bytep_NULL (png_bytep)NULL 591 #define png_bytepp_NULL (png_bytepp)NULL 592 #define png_doublep_NULL (png_doublep)NULL 593 #define png_error_ptr_NULL (png_error_ptr)NULL 594 #define png_flush_ptr_NULL (png_flush_ptr)NULL 595 #define png_free_ptr_NULL (png_free_ptr)NULL 596 #define png_infopp_NULL (png_infopp)NULL 597 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 598 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 599 #define png_rw_ptr_NULL (png_rw_ptr)NULL 600 #define png_structp_NULL (png_structp)NULL 601 #define png_uint_16p_NULL (png_uint_16p)NULL 602 #define png_voidp_NULL (png_voidp)NULL 603 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 604 #else 605 #define int_p_NULL NULL 606 #define png_bytep_NULL NULL 607 #define png_bytepp_NULL NULL 608 #define png_doublep_NULL NULL 609 #define png_error_ptr_NULL NULL 610 #define png_flush_ptr_NULL NULL 611 #define png_free_ptr_NULL NULL 612 #define png_infopp_NULL NULL 613 #define png_malloc_ptr_NULL NULL 614 #define png_read_status_ptr_NULL NULL 615 #define png_rw_ptr_NULL NULL 616 #define png_structp_NULL NULL 617 #define png_uint_16p_NULL NULL 618 #define png_voidp_NULL NULL 619 #define png_write_status_ptr_NULL NULL 620 #endif 621 622 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 623 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 624 /* Version information for C files, stored in png.c. This had better match 625 * the version above. 626 */ 627 #ifdef PNG_USE_GLOBAL_ARRAYS 628 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 629 /* Need room for 99.99.99beta99z */ 630 #else 631 #define png_libpng_ver png_get_header_ver(NULL) 632 #endif 633 634 #ifdef PNG_USE_GLOBAL_ARRAYS 635 /* This was removed in version 1.0.5c */ 636 /* Structures to facilitate easy interlacing. See png.c for more details */ 637 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 638 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 639 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 640 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 641 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 642 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 643 /* This isn't currently used. If you need it, see png.c for more details. 644 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 645 */ 646 #endif 647 648 #endif /* PNG_NO_EXTERN */ 649 650 /* Three color definitions. The order of the red, green, and blue, (and the 651 * exact size) is not important, although the size of the fields need to 652 * be png_byte or png_uint_16 (as defined below). 653 */ 654 typedef struct png_color_struct 655 { 656 png_byte red; 657 png_byte green; 658 png_byte blue; 659 } png_color; 660 typedef png_color FAR * png_colorp; 661 typedef png_color FAR * FAR * png_colorpp; 662 663 typedef struct png_color_16_struct 664 { 665 png_byte index; /* used for palette files */ 666 png_uint_16 red; /* for use in red green blue files */ 667 png_uint_16 green; 668 png_uint_16 blue; 669 png_uint_16 gray; /* for use in grayscale files */ 670 } png_color_16; 671 typedef png_color_16 FAR * png_color_16p; 672 typedef png_color_16 FAR * FAR * png_color_16pp; 673 674 typedef struct png_color_8_struct 675 { 676 png_byte red; /* for use in red green blue files */ 677 png_byte green; 678 png_byte blue; 679 png_byte gray; /* for use in grayscale files */ 680 png_byte alpha; /* for alpha channel files */ 681 } png_color_8; 682 typedef png_color_8 FAR * png_color_8p; 683 typedef png_color_8 FAR * FAR * png_color_8pp; 684 685 /* 686 * The following two structures are used for the in-core representation 687 * of sPLT chunks. 688 */ 689 typedef struct png_sPLT_entry_struct 690 { 691 png_uint_16 red; 692 png_uint_16 green; 693 png_uint_16 blue; 694 png_uint_16 alpha; 695 png_uint_16 frequency; 696 } png_sPLT_entry; 697 typedef png_sPLT_entry FAR * png_sPLT_entryp; 698 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 699 700 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 701 * occupy the LSB of their respective members, and the MSB of each member 702 * is zero-filled. The frequency member always occupies the full 16 bits. 703 */ 704 705 typedef struct png_sPLT_struct 706 { 707 png_charp name; /* palette name */ 708 png_byte depth; /* depth of palette samples */ 709 png_sPLT_entryp entries; /* palette entries */ 710 png_int_32 nentries; /* number of palette entries */ 711 } png_sPLT_t; 712 typedef png_sPLT_t FAR * png_sPLT_tp; 713 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 714 715 #ifdef PNG_TEXT_SUPPORTED 716 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 717 * and whether that contents is compressed or not. The "key" field 718 * points to a regular zero-terminated C string. The "text", "lang", and 719 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 720 * However, the * structure returned by png_get_text() will always contain 721 * regular zero-terminated C strings (possibly empty), never NULL pointers, 722 * so they can be safely used in printf() and other string-handling functions. 723 */ 724 typedef struct png_text_struct 725 { 726 int compression; /* compression value: 727 -1: tEXt, none 728 0: zTXt, deflate 729 1: iTXt, none 730 2: iTXt, deflate */ 731 png_charp key; /* keyword, 1-79 character description of "text" */ 732 png_charp text; /* comment, may be an empty string (ie "") 733 or a NULL pointer */ 734 png_size_t text_length; /* length of the text string */ 735 #ifdef PNG_iTXt_SUPPORTED 736 png_size_t itxt_length; /* length of the itxt string */ 737 png_charp lang; /* language code, 0-79 characters 738 or a NULL pointer */ 739 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 740 chars or a NULL pointer */ 741 #endif 742 } png_text; 743 typedef png_text FAR * png_textp; 744 typedef png_text FAR * FAR * png_textpp; 745 #endif 746 747 /* Supported compression types for text in PNG files (tEXt, and zTXt). 748 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 749 */ 750 #define PNG_TEXT_COMPRESSION_NONE_WR -3 751 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 752 #define PNG_TEXT_COMPRESSION_NONE -1 753 #define PNG_TEXT_COMPRESSION_zTXt 0 754 #define PNG_ITXT_COMPRESSION_NONE 1 755 #define PNG_ITXT_COMPRESSION_zTXt 2 756 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 757 758 /* png_time is a way to hold the time in an machine independent way. 759 * Two conversions are provided, both from time_t and struct tm. There 760 * is no portable way to convert to either of these structures, as far 761 * as I know. If you know of a portable way, send it to me. As a side 762 * note - PNG has always been Year 2000 compliant! 763 */ 764 typedef struct png_time_struct 765 { 766 png_uint_16 year; /* full year, as in, 1995 */ 767 png_byte month; /* month of year, 1 - 12 */ 768 png_byte day; /* day of month, 1 - 31 */ 769 png_byte hour; /* hour of day, 0 - 23 */ 770 png_byte minute; /* minute of hour, 0 - 59 */ 771 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 772 } png_time; 773 typedef png_time FAR * png_timep; 774 typedef png_time FAR * FAR * png_timepp; 775 776 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 777 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 778 /* png_unknown_chunk is a structure to hold queued chunks for which there is 779 * no specific support. The idea is that we can use this to queue 780 * up private chunks for output even though the library doesn't actually 781 * know about their semantics. 782 */ 783 #define PNG_CHUNK_NAME_LENGTH 5 784 typedef struct png_unknown_chunk_t 785 { 786 png_byte name[PNG_CHUNK_NAME_LENGTH]; 787 png_byte *data; 788 png_size_t size; 789 790 /* libpng-using applications should NOT directly modify this byte. */ 791 png_byte location; /* mode of operation at read time */ 792 } 793 png_unknown_chunk; 794 typedef png_unknown_chunk FAR * png_unknown_chunkp; 795 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 796 #endif 797 798 /* png_info is a structure that holds the information in a PNG file so 799 * that the application can find out the characteristics of the image. 800 * If you are reading the file, this structure will tell you what is 801 * in the PNG file. If you are writing the file, fill in the information 802 * you want to put into the PNG file, then call png_write_info(). 803 * The names chosen should be very close to the PNG specification, so 804 * consult that document for information about the meaning of each field. 805 * 806 * With libpng < 0.95, it was only possible to directly set and read the 807 * the values in the png_info_struct, which meant that the contents and 808 * order of the values had to remain fixed. With libpng 0.95 and later, 809 * however, there are now functions that abstract the contents of 810 * png_info_struct from the application, so this makes it easier to use 811 * libpng with dynamic libraries, and even makes it possible to use 812 * libraries that don't have all of the libpng ancillary chunk-handing 813 * functionality. 814 * 815 * In any case, the order of the parameters in png_info_struct should NOT 816 * be changed for as long as possible to keep compatibility with applications 817 * that use the old direct-access method with png_info_struct. 818 * 819 * The following members may have allocated storage attached that should be 820 * cleaned up before the structure is discarded: palette, trans, text, 821 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 822 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 823 * are automatically freed when the info structure is deallocated, if they were 824 * allocated internally by libpng. This behavior can be changed by means 825 * of the png_data_freer() function. 826 * 827 * More allocation details: all the chunk-reading functions that 828 * change these members go through the corresponding png_set_* 829 * functions. A function to clear these members is available: see 830 * png_free_data(). The png_set_* functions do not depend on being 831 * able to point info structure members to any of the storage they are 832 * passed (they make their own copies), EXCEPT that the png_set_text 833 * functions use the same storage passed to them in the text_ptr or 834 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 835 * functions do not make their own copies. 836 */ 837 typedef struct png_info_struct 838 { 839 /* The following are necessary for every PNG file */ 840 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 841 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 842 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 843 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 844 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 845 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 846 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 847 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 848 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 849 /* The following three should have been named *_method not *_type */ 850 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 851 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 852 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 853 854 /* The following is informational only on read, and not used on writes. */ 855 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 856 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 857 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 858 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 859 860 /* The rest of the data is optional. If you are reading, check the 861 * valid field to see if the information in these are valid. If you 862 * are writing, set the valid field to those chunks you want written, 863 * and initialize the appropriate fields below. 864 */ 865 866 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 867 /* The gAMA chunk describes the gamma characteristics of the system 868 * on which the image was created, normally in the range [1.0, 2.5]. 869 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 870 */ 871 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 872 #endif 873 874 #ifdef PNG_sRGB_SUPPORTED 875 /* GR-P, 0.96a */ 876 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 877 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 878 #endif 879 880 #ifdef PNG_TEXT_SUPPORTED 881 /* The tEXt, and zTXt chunks contain human-readable textual data in 882 * uncompressed, compressed, and optionally compressed forms, respectively. 883 * The data in "text" is an array of pointers to uncompressed, 884 * null-terminated C strings. Each chunk has a keyword that describes the 885 * textual data contained in that chunk. Keywords are not required to be 886 * unique, and the text string may be empty. Any number of text chunks may 887 * be in an image. 888 */ 889 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 890 int max_text PNG_DEPSTRUCT; /* current size of text array */ 891 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 892 #endif /* PNG_TEXT_SUPPORTED */ 893 894 #ifdef PNG_tIME_SUPPORTED 895 /* The tIME chunk holds the last time the displayed image data was 896 * modified. See the png_time struct for the contents of this struct. 897 */ 898 png_time mod_time PNG_DEPSTRUCT; 899 #endif 900 901 #ifdef PNG_sBIT_SUPPORTED 902 /* The sBIT chunk specifies the number of significant high-order bits 903 * in the pixel data. Values are in the range [1, bit_depth], and are 904 * only specified for the channels in the pixel data. The contents of 905 * the low-order bits is not specified. Data is valid if 906 * (valid & PNG_INFO_sBIT) is non-zero. 907 */ 908 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 909 #endif 910 911 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 912 defined(PNG_READ_BACKGROUND_SUPPORTED) 913 /* The tRNS chunk supplies transparency data for paletted images and 914 * other image types that don't need a full alpha channel. There are 915 * "num_trans" transparency values for a paletted image, stored in the 916 * same order as the palette colors, starting from index 0. Values 917 * for the data are in the range [0, 255], ranging from fully transparent 918 * to fully opaque, respectively. For non-paletted images, there is a 919 * single color specified that should be treated as fully transparent. 920 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 921 */ 922 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 923 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 924 #endif 925 926 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 927 /* The bKGD chunk gives the suggested image background color if the 928 * display program does not have its own background color and the image 929 * is needs to composited onto a background before display. The colors 930 * in "background" are normally in the same color space/depth as the 931 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 932 */ 933 png_color_16 background PNG_DEPSTRUCT; 934 #endif 935 936 #ifdef PNG_oFFs_SUPPORTED 937 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 938 * and downwards from the top-left corner of the display, page, or other 939 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 940 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 941 */ 942 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 943 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 944 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 945 #endif 946 947 #ifdef PNG_pHYs_SUPPORTED 948 /* The pHYs chunk gives the physical pixel density of the image for 949 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 950 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 951 */ 952 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 953 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 954 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 955 #endif 956 957 #ifdef PNG_hIST_SUPPORTED 958 /* The hIST chunk contains the relative frequency or importance of the 959 * various palette entries, so that a viewer can intelligently select a 960 * reduced-color palette, if required. Data is an array of "num_palette" 961 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 962 * is non-zero. 963 */ 964 png_uint_16p hist PNG_DEPSTRUCT; 965 #endif 966 967 #ifdef PNG_cHRM_SUPPORTED 968 /* The cHRM chunk describes the CIE color characteristics of the monitor 969 * on which the PNG was created. This data allows the viewer to do gamut 970 * mapping of the input image to ensure that the viewer sees the same 971 * colors in the image as the creator. Values are in the range 972 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 973 */ 974 #ifdef PNG_FLOATING_POINT_SUPPORTED 975 float x_white PNG_DEPSTRUCT; 976 float y_white PNG_DEPSTRUCT; 977 float x_red PNG_DEPSTRUCT; 978 float y_red PNG_DEPSTRUCT; 979 float x_green PNG_DEPSTRUCT; 980 float y_green PNG_DEPSTRUCT; 981 float x_blue PNG_DEPSTRUCT; 982 float y_blue PNG_DEPSTRUCT; 983 #endif 984 #endif 985 986 #ifdef PNG_pCAL_SUPPORTED 987 /* The pCAL chunk describes a transformation between the stored pixel 988 * values and original physical data values used to create the image. 989 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 990 * range given by [pcal_X0, pcal_X1], and are further transformed by a 991 * (possibly non-linear) transformation function given by "pcal_type" 992 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 993 * defines below, and the PNG-Group's PNG extensions document for a 994 * complete description of the transformations and how they should be 995 * implemented, and for a description of the ASCII parameter strings. 996 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 997 */ 998 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 999 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 1000 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 1001 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 1002 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 1003 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 1004 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 1005 #endif 1006 1007 /* New members added in libpng-1.0.6 */ 1008 #ifdef PNG_FREE_ME_SUPPORTED 1009 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1010 #endif 1011 1012 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 1013 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1014 /* Storage for unknown chunks that the library doesn't recognize. */ 1015 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 1016 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 1017 #endif 1018 1019 #ifdef PNG_iCCP_SUPPORTED 1020 /* iCCP chunk data. */ 1021 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 1022 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 1023 /* Note to maintainer: should be png_bytep */ 1024 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 1025 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 1026 #endif 1027 1028 #ifdef PNG_sPLT_SUPPORTED 1029 /* Data on sPLT chunks (there may be more than one). */ 1030 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1031 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1032 #endif 1033 1034 #ifdef PNG_sCAL_SUPPORTED 1035 /* The sCAL chunk describes the actual physical dimensions of the 1036 * subject matter of the graphic. The chunk contains a unit specification 1037 * a byte value, and two ASCII strings representing floating-point 1038 * values. The values are width and height corresponsing to one pixel 1039 * in the image. This external representation is converted to double 1040 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1041 */ 1042 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1043 #ifdef PNG_FLOATING_POINT_SUPPORTED 1044 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1045 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1046 #endif 1047 #ifdef PNG_FIXED_POINT_SUPPORTED 1048 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1049 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1050 #endif 1051 #endif 1052 1053 #ifdef PNG_INFO_IMAGE_SUPPORTED 1054 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1055 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1056 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1057 #endif 1058 1059 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1060 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1061 #endif 1062 1063 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1064 png_fixed_point int_x_white PNG_DEPSTRUCT; 1065 png_fixed_point int_y_white PNG_DEPSTRUCT; 1066 png_fixed_point int_x_red PNG_DEPSTRUCT; 1067 png_fixed_point int_y_red PNG_DEPSTRUCT; 1068 png_fixed_point int_x_green PNG_DEPSTRUCT; 1069 png_fixed_point int_y_green PNG_DEPSTRUCT; 1070 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1071 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1072 #endif 1073 1074 } png_info; 1075 1076 typedef png_info FAR * png_infop; 1077 typedef png_info FAR * FAR * png_infopp; 1078 1079 /* Maximum positive integer used in PNG is (2^31)-1 */ 1080 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1081 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1082 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1083 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1084 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1085 #define PNG_MAX_UINT PNG_UINT_31_MAX 1086 #endif 1087 1088 /* These describe the color_type field in png_info. */ 1089 /* color type masks */ 1090 #define PNG_COLOR_MASK_PALETTE 1 1091 #define PNG_COLOR_MASK_COLOR 2 1092 #define PNG_COLOR_MASK_ALPHA 4 1093 1094 /* color types. Note that not all combinations are legal */ 1095 #define PNG_COLOR_TYPE_GRAY 0 1096 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1097 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1098 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1099 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1100 /* aliases */ 1101 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1102 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1103 1104 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1105 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1106 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1107 1108 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1109 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1110 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1111 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1112 1113 /* These are for the interlacing type. These values should NOT be changed. */ 1114 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1115 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1116 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1117 1118 /* These are for the oFFs chunk. These values should NOT be changed. */ 1119 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1120 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1121 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1122 1123 /* These are for the pCAL chunk. These values should NOT be changed. */ 1124 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1125 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1126 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1127 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1128 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1129 1130 /* These are for the sCAL chunk. These values should NOT be changed. */ 1131 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1132 #define PNG_SCALE_METER 1 /* meters per pixel */ 1133 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1134 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1135 1136 /* These are for the pHYs chunk. These values should NOT be changed. */ 1137 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1138 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1139 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1140 1141 /* These are for the sRGB chunk. These values should NOT be changed. */ 1142 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1143 #define PNG_sRGB_INTENT_RELATIVE 1 1144 #define PNG_sRGB_INTENT_SATURATION 2 1145 #define PNG_sRGB_INTENT_ABSOLUTE 3 1146 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1147 1148 /* This is for text chunks */ 1149 #define PNG_KEYWORD_MAX_LENGTH 79 1150 1151 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1152 #define PNG_MAX_PALETTE_LENGTH 256 1153 1154 /* These determine if an ancillary chunk's data has been successfully read 1155 * from the PNG header, or if the application has filled in the corresponding 1156 * data in the info_struct to be written into the output file. The values 1157 * of the PNG_INFO_<chunk> defines should NOT be changed. 1158 */ 1159 #define PNG_INFO_gAMA 0x0001 1160 #define PNG_INFO_sBIT 0x0002 1161 #define PNG_INFO_cHRM 0x0004 1162 #define PNG_INFO_PLTE 0x0008 1163 #define PNG_INFO_tRNS 0x0010 1164 #define PNG_INFO_bKGD 0x0020 1165 #define PNG_INFO_hIST 0x0040 1166 #define PNG_INFO_pHYs 0x0080 1167 #define PNG_INFO_oFFs 0x0100 1168 #define PNG_INFO_tIME 0x0200 1169 #define PNG_INFO_pCAL 0x0400 1170 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1171 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1172 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1173 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1174 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1175 1176 /* This is used for the transformation routines, as some of them 1177 * change these values for the row. It also should enable using 1178 * the routines for other purposes. 1179 */ 1180 typedef struct png_row_info_struct 1181 { 1182 png_uint_32 width; /* width of row */ 1183 png_uint_32 rowbytes; /* number of bytes in row */ 1184 png_byte color_type; /* color type of row */ 1185 png_byte bit_depth; /* bit depth of row */ 1186 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1187 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1188 } png_row_info; 1189 1190 typedef png_row_info FAR * png_row_infop; 1191 typedef png_row_info FAR * FAR * png_row_infopp; 1192 1193 /* These are the function types for the I/O functions and for the functions 1194 * that allow the user to override the default I/O functions with his or her 1195 * own. The png_error_ptr type should match that of user-supplied warning 1196 * and error functions, while the png_rw_ptr type should match that of the 1197 * user read/write data functions. 1198 */ 1199 typedef struct png_struct_def png_struct; 1200 typedef png_struct FAR * png_structp; 1201 1202 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1203 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1204 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1205 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1206 int)); 1207 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1208 int)); 1209 1210 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1211 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1212 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1213 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1214 png_uint_32, int)); 1215 #endif 1216 1217 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1218 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1219 defined(PNG_LEGACY_SUPPORTED) 1220 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1221 png_row_infop, png_bytep)); 1222 #endif 1223 1224 #ifdef PNG_USER_CHUNKS_SUPPORTED 1225 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1226 #endif 1227 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1228 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1229 #endif 1230 1231 /* Transform masks for the high-level interface */ 1232 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1233 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1234 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1235 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1236 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1237 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1238 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1239 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1240 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1241 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1242 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1243 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1244 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1245 /* Added to libpng-1.2.34 */ 1246 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1247 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1248 /* Added to libpng-1.2.41 */ 1249 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1250 1251 /* Flags for MNG supported features */ 1252 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1253 #define PNG_FLAG_MNG_FILTER_64 0x04 1254 #define PNG_ALL_MNG_FEATURES 0x05 1255 1256 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1257 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1258 1259 /* The structure that holds the information to read and write PNG files. 1260 * The only people who need to care about what is inside of this are the 1261 * people who will be modifying the library for their own special needs. 1262 * It should NOT be accessed directly by an application, except to store 1263 * the jmp_buf. 1264 */ 1265 1266 struct png_struct_def 1267 { 1268 #ifdef PNG_SETJMP_SUPPORTED 1269 jmp_buf jmpbuf; /* used in png_error */ 1270 #endif 1271 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1272 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1273 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1274 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1275 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1276 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1277 1278 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1279 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1280 #endif 1281 1282 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1283 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1284 #endif 1285 1286 /* These were added in libpng-1.0.2 */ 1287 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1288 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1289 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1290 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1291 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1292 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1293 #endif 1294 #endif 1295 1296 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1297 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1298 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1299 1300 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1301 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1302 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1303 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1304 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1305 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1306 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1307 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1308 1309 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1310 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1311 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1312 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1313 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1314 #if 0 /* Replaced with the following in libpng-1.2.43 */ 1315 png_size_t irowbytes PNG_DEPSTRUCT; 1316 #endif 1317 /* Added in libpng-1.2.43 */ 1318 #ifdef PNG_USER_LIMITS_SUPPORTED 1319 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1320 * chunks that can be stored (0 means unlimited). 1321 */ 1322 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1323 #endif 1324 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1325 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1326 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1327 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1328 #ifndef PNG_NO_WRITE_FILTER 1329 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1330 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1331 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1332 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1333 #endif 1334 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1335 1336 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1337 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1338 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1339 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1340 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1341 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1342 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1343 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1344 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1345 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1346 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1347 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1348 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1349 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1350 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1351 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1352 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1353 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1354 1355 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1356 #ifdef PNG_LEGACY_SUPPORTED 1357 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1358 #else 1359 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1360 #endif 1361 #endif 1362 1363 #ifdef PNG_bKGD_SUPPORTED 1364 png_byte background_gamma_type PNG_DEPSTRUCT; 1365 # ifdef PNG_FLOATING_POINT_SUPPORTED 1366 float background_gamma PNG_DEPSTRUCT; 1367 # endif 1368 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1369 #ifdef PNG_READ_GAMMA_SUPPORTED 1370 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1371 #endif 1372 #endif /* PNG_bKGD_SUPPORTED */ 1373 1374 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1375 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1376 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1377 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1378 #endif 1379 1380 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1381 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1382 #ifdef PNG_FLOATING_POINT_SUPPORTED 1383 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1384 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1385 #endif 1386 #endif 1387 1388 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1389 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1390 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1391 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1392 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1393 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1394 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1395 #endif 1396 1397 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1398 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1399 #endif 1400 1401 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1402 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1403 #endif 1404 1405 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1406 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1407 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1408 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1409 #endif 1410 1411 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1412 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1413 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1414 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1415 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1416 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1417 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1418 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1419 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1420 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1421 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1422 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1423 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1424 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1425 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1426 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1427 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1428 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1429 1430 # ifdef PNG_TEXT_SUPPORTED 1431 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1432 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1433 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1434 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1435 # endif /* PNG_TEXT_SUPPORTED */ 1436 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1437 1438 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1439 /* for the Borland special 64K segment handler */ 1440 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1441 png_bytep offset_table PNG_DEPSTRUCT; 1442 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1443 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1444 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1445 #endif 1446 1447 #ifdef PNG_READ_DITHER_SUPPORTED 1448 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1449 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1450 #endif 1451 1452 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1453 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1454 #endif 1455 1456 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1457 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1458 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1459 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1460 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1461 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1462 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1463 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1464 #endif 1465 1466 #ifdef PNG_TIME_RFC1123_SUPPORTED 1467 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1468 #endif 1469 1470 /* New members added in libpng-1.0.6 */ 1471 1472 #ifdef PNG_FREE_ME_SUPPORTED 1473 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1474 #endif 1475 1476 #ifdef PNG_USER_CHUNKS_SUPPORTED 1477 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1478 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1479 #endif 1480 1481 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1482 int num_chunk_list PNG_DEPSTRUCT; 1483 png_bytep chunk_list PNG_DEPSTRUCT; 1484 #endif 1485 1486 /* New members added in libpng-1.0.3 */ 1487 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1488 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1489 /* These were changed from png_byte in libpng-1.0.6 */ 1490 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1491 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1492 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1493 #endif 1494 1495 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1496 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1497 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1498 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1499 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1500 #ifdef PNG_1_0_X 1501 png_byte mng_features_permitted PNG_DEPSTRUCT; 1502 #else 1503 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1504 #endif /* PNG_1_0_X */ 1505 #endif 1506 1507 /* New member added in libpng-1.0.7 */ 1508 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1509 png_fixed_point int_gamma PNG_DEPSTRUCT; 1510 #endif 1511 1512 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1513 #ifdef PNG_MNG_FEATURES_SUPPORTED 1514 png_byte filter_type PNG_DEPSTRUCT; 1515 #endif 1516 1517 #ifdef PNG_1_0_X 1518 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1519 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1520 #endif 1521 1522 /* New members added in libpng-1.2.0 */ 1523 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1524 # ifndef PNG_1_0_X 1525 # ifdef PNG_MMX_CODE_SUPPORTED 1526 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1527 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1528 # endif 1529 png_uint_32 asm_flags PNG_DEPSTRUCT; 1530 # endif 1531 #endif 1532 1533 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1534 #ifdef PNG_USER_MEM_SUPPORTED 1535 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1536 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1537 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1538 #endif 1539 1540 /* New member added in libpng-1.0.13 and 1.2.0 */ 1541 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1542 1543 #ifdef PNG_READ_DITHER_SUPPORTED 1544 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1545 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1546 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1547 /* in the palette */ 1548 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1549 /* palette color */ 1550 #endif 1551 1552 /* New members added in libpng-1.0.16 and 1.2.6 */ 1553 png_byte compression_type PNG_DEPSTRUCT; 1554 1555 #ifdef PNG_USER_LIMITS_SUPPORTED 1556 png_uint_32 user_width_max PNG_DEPSTRUCT; 1557 png_uint_32 user_height_max PNG_DEPSTRUCT; 1558 #endif 1559 1560 /* New member added in libpng-1.0.25 and 1.2.17 */ 1561 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1562 /* Storage for unknown chunk that the library doesn't recognize. */ 1563 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1564 #endif 1565 1566 /* New members added in libpng-1.2.26 */ 1567 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1568 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1569 1570 /* New member added in libpng-1.2.30 */ 1571 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1572 1573 1574 }; 1575 1576 1577 /* This triggers a compiler error in png.c, if png.c and png.h 1578 * do not agree upon the version number. 1579 */ 1580 typedef png_structp version_1_2_52; 1581 1582 typedef png_struct FAR * FAR * png_structpp; 1583 1584 /* Here are the function definitions most commonly used. This is not 1585 * the place to find out how to use libpng. See libpng.txt for the 1586 * full explanation, see example.c for the summary. This just provides 1587 * a simple one line description of the use of each function. 1588 */ 1589 1590 /* Returns the version number of the library */ 1591 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1592 1593 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1594 * Handling more than 8 bytes from the beginning of the file is an error. 1595 */ 1596 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1597 int num_bytes)); 1598 1599 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1600 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1601 * signature, and non-zero otherwise. Having num_to_check == 0 or 1602 * start > 7 will always fail (ie return non-zero). 1603 */ 1604 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1605 png_size_t num_to_check)); 1606 1607 /* Simple signature checking function. This is the same as calling 1608 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1609 */ 1610 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1611 1612 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1613 extern PNG_EXPORT(png_structp,png_create_read_struct) 1614 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1615 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1616 1617 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1618 extern PNG_EXPORT(png_structp,png_create_write_struct) 1619 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1620 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1621 1622 #ifdef PNG_WRITE_SUPPORTED 1623 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1624 PNGARG((png_structp png_ptr)); 1625 #endif 1626 1627 #ifdef PNG_WRITE_SUPPORTED 1628 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1629 PNGARG((png_structp png_ptr, png_uint_32 size)); 1630 #endif 1631 1632 /* Reset the compression stream */ 1633 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1634 1635 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1636 #ifdef PNG_USER_MEM_SUPPORTED 1637 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1638 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1639 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1640 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1641 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1642 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1643 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1644 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1645 #endif 1646 1647 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1648 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1649 png_bytep chunk_name, png_bytep data, png_size_t length)); 1650 1651 /* Write the start of a PNG chunk - length and chunk name. */ 1652 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1653 png_bytep chunk_name, png_uint_32 length)); 1654 1655 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1656 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1657 png_bytep data, png_size_t length)); 1658 1659 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1660 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1661 1662 /* Allocate and initialize the info structure */ 1663 extern PNG_EXPORT(png_infop,png_create_info_struct) 1664 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1665 1666 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1667 /* Initialize the info structure (old interface - DEPRECATED) */ 1668 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1669 PNG_DEPRECATED; 1670 #undef png_info_init 1671 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1672 png_sizeof(png_info)); 1673 #endif 1674 1675 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1676 png_size_t png_info_struct_size)); 1677 1678 /* Writes all the PNG information before the image. */ 1679 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1680 png_infop info_ptr)); 1681 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1682 png_infop info_ptr)); 1683 1684 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1685 /* Read the information before the actual image data. */ 1686 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1687 png_infop info_ptr)); 1688 #endif 1689 1690 #ifdef PNG_TIME_RFC1123_SUPPORTED 1691 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1692 PNGARG((png_structp png_ptr, png_timep ptime)); 1693 #endif 1694 1695 #ifdef PNG_CONVERT_tIME_SUPPORTED 1696 /* Convert from a struct tm to png_time */ 1697 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1698 struct tm FAR * ttime)); 1699 1700 /* Convert from time_t to png_time. Uses gmtime() */ 1701 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1702 time_t ttime)); 1703 #endif /* PNG_CONVERT_tIME_SUPPORTED */ 1704 1705 #ifdef PNG_READ_EXPAND_SUPPORTED 1706 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1707 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1708 #ifndef PNG_1_0_X 1709 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1710 png_ptr)); 1711 #endif 1712 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1713 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1714 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1715 /* Deprecated */ 1716 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1717 png_ptr)) PNG_DEPRECATED; 1718 #endif 1719 #endif 1720 1721 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1722 /* Use blue, green, red order for pixels. */ 1723 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1724 #endif 1725 1726 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1727 /* Expand the grayscale to 24-bit RGB if necessary. */ 1728 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1729 #endif 1730 1731 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1732 /* Reduce RGB to grayscale. */ 1733 #ifdef PNG_FLOATING_POINT_SUPPORTED 1734 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1735 int error_action, double red, double green )); 1736 #endif 1737 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1738 int error_action, png_fixed_point red, png_fixed_point green )); 1739 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1740 png_ptr)); 1741 #endif 1742 1743 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1744 png_colorp palette)); 1745 1746 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1747 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1748 #endif 1749 1750 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1751 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1752 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1753 #endif 1754 1755 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1756 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1757 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1758 #endif 1759 1760 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1761 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1762 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1763 png_uint_32 filler, int flags)); 1764 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1765 #define PNG_FILLER_BEFORE 0 1766 #define PNG_FILLER_AFTER 1 1767 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1768 #ifndef PNG_1_0_X 1769 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1770 png_uint_32 filler, int flags)); 1771 #endif 1772 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1773 1774 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1775 /* Swap bytes in 16-bit depth files. */ 1776 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1777 #endif 1778 1779 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1780 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1781 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1782 #endif 1783 1784 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1785 /* Swap packing order of pixels in bytes. */ 1786 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1787 #endif 1788 1789 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1790 /* Converts files to legal bit depths. */ 1791 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1792 png_color_8p true_bits)); 1793 #endif 1794 1795 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1796 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1797 /* Have the code handle the interlacing. Returns the number of passes. */ 1798 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1799 #endif 1800 1801 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1802 /* Invert monochrome files */ 1803 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1804 #endif 1805 1806 #ifdef PNG_READ_BACKGROUND_SUPPORTED 1807 /* Handle alpha and tRNS by replacing with a background color. */ 1808 #ifdef PNG_FLOATING_POINT_SUPPORTED 1809 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1810 png_color_16p background_color, int background_gamma_code, 1811 int need_expand, double background_gamma)); 1812 #endif 1813 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1814 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1815 #define PNG_BACKGROUND_GAMMA_FILE 2 1816 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1817 #endif 1818 1819 #ifdef PNG_READ_16_TO_8_SUPPORTED 1820 /* Strip the second byte of information from a 16-bit depth file. */ 1821 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1822 #endif 1823 1824 #ifdef PNG_READ_DITHER_SUPPORTED 1825 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1826 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1827 png_colorp palette, int num_palette, int maximum_colors, 1828 png_uint_16p histogram, int full_dither)); 1829 #endif 1830 1831 #ifdef PNG_READ_GAMMA_SUPPORTED 1832 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1833 #ifdef PNG_FLOATING_POINT_SUPPORTED 1834 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1835 double screen_gamma, double default_file_gamma)); 1836 #endif 1837 #endif 1838 1839 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1840 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1841 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1842 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1843 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1844 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1845 int empty_plte_permitted)) PNG_DEPRECATED; 1846 #endif 1847 #endif 1848 1849 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1850 /* Set how many lines between output flushes - 0 for no flushing */ 1851 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1852 /* Flush the current PNG output buffer */ 1853 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1854 #endif 1855 1856 /* Optional update palette with requested transformations */ 1857 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1858 1859 /* Optional call to update the users info structure */ 1860 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1861 png_infop info_ptr)); 1862 1863 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1864 /* Read one or more rows of image data. */ 1865 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1866 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1867 #endif 1868 1869 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1870 /* Read a row of data. */ 1871 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1872 png_bytep row, 1873 png_bytep display_row)); 1874 #endif 1875 1876 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1877 /* Read the whole image into memory at once. */ 1878 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1879 png_bytepp image)); 1880 #endif 1881 1882 /* Write a row of image data */ 1883 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1884 png_bytep row)); 1885 1886 /* Write a few rows of image data */ 1887 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1888 png_bytepp row, png_uint_32 num_rows)); 1889 1890 /* Write the image data */ 1891 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1892 png_bytepp image)); 1893 1894 /* Writes the end of the PNG file. */ 1895 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1896 png_infop info_ptr)); 1897 1898 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1899 /* Read the end of the PNG file. */ 1900 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1901 png_infop info_ptr)); 1902 #endif 1903 1904 /* Free any memory associated with the png_info_struct */ 1905 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1906 png_infopp info_ptr_ptr)); 1907 1908 /* Free any memory associated with the png_struct and the png_info_structs */ 1909 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1910 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1911 1912 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1913 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1914 png_infop end_info_ptr)) PNG_DEPRECATED; 1915 1916 /* Free any memory associated with the png_struct and the png_info_structs */ 1917 extern PNG_EXPORT(void,png_destroy_write_struct) 1918 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1919 1920 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1921 extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1922 1923 /* Set the libpng method of handling chunk CRC errors */ 1924 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1925 int crit_action, int ancil_action)); 1926 1927 /* Values for png_set_crc_action() to say how to handle CRC errors in 1928 * ancillary and critical chunks, and whether to use the data contained 1929 * therein. Note that it is impossible to "discard" data in a critical 1930 * chunk. For versions prior to 0.90, the action was always error/quit, 1931 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1932 * chunks is warn/discard. These values should NOT be changed. 1933 * 1934 * value action:critical action:ancillary 1935 */ 1936 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1937 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1938 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1939 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1940 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1941 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1942 1943 /* These functions give the user control over the scan-line filtering in 1944 * libpng and the compression methods used by zlib. These functions are 1945 * mainly useful for testing, as the defaults should work with most users. 1946 * Those users who are tight on memory or want faster performance at the 1947 * expense of compression can modify them. See the compression library 1948 * header file (zlib.h) for an explination of the compression functions. 1949 */ 1950 1951 /* Set the filtering method(s) used by libpng. Currently, the only valid 1952 * value for "method" is 0. 1953 */ 1954 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1955 int filters)); 1956 1957 /* Flags for png_set_filter() to say which filters to use. The flags 1958 * are chosen so that they don't conflict with real filter types 1959 * below, in case they are supplied instead of the #defined constants. 1960 * These values should NOT be changed. 1961 */ 1962 #define PNG_NO_FILTERS 0x00 1963 #define PNG_FILTER_NONE 0x08 1964 #define PNG_FILTER_SUB 0x10 1965 #define PNG_FILTER_UP 0x20 1966 #define PNG_FILTER_AVG 0x40 1967 #define PNG_FILTER_PAETH 0x80 1968 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1969 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1970 1971 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1972 * These defines should NOT be changed. 1973 */ 1974 #define PNG_FILTER_VALUE_NONE 0 1975 #define PNG_FILTER_VALUE_SUB 1 1976 #define PNG_FILTER_VALUE_UP 2 1977 #define PNG_FILTER_VALUE_AVG 3 1978 #define PNG_FILTER_VALUE_PAETH 4 1979 #define PNG_FILTER_VALUE_LAST 5 1980 1981 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1982 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1983 * defines, either the default (minimum-sum-of-absolute-differences), or 1984 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1985 * 1986 * Weights are factors >= 1.0, indicating how important it is to keep the 1987 * filter type consistent between rows. Larger numbers mean the current 1988 * filter is that many times as likely to be the same as the "num_weights" 1989 * previous filters. This is cumulative for each previous row with a weight. 1990 * There needs to be "num_weights" values in "filter_weights", or it can be 1991 * NULL if the weights aren't being specified. Weights have no influence on 1992 * the selection of the first row filter. Well chosen weights can (in theory) 1993 * improve the compression for a given image. 1994 * 1995 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1996 * filter type. Higher costs indicate more decoding expense, and are 1997 * therefore less likely to be selected over a filter with lower computational 1998 * costs. There needs to be a value in "filter_costs" for each valid filter 1999 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 2000 * setting the costs. Costs try to improve the speed of decompression without 2001 * unduly increasing the compressed image size. 2002 * 2003 * A negative weight or cost indicates the default value is to be used, and 2004 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 2005 * The default values for both weights and costs are currently 1.0, but may 2006 * change if good general weighting/cost heuristics can be found. If both 2007 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 2008 * to the UNWEIGHTED method, but with added encoding time/computation. 2009 */ 2010 #ifdef PNG_FLOATING_POINT_SUPPORTED 2011 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 2012 int heuristic_method, int num_weights, png_doublep filter_weights, 2013 png_doublep filter_costs)); 2014 #endif 2015 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 2016 2017 /* Heuristic used for row filter selection. These defines should NOT be 2018 * changed. 2019 */ 2020 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 2021 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 2022 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 2023 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 2024 2025 /* Set the library compression level. Currently, valid values range from 2026 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2027 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2028 * shown that zlib compression levels 3-6 usually perform as well as level 9 2029 * for PNG images, and do considerably fewer caclulations. In the future, 2030 * these values may not correspond directly to the zlib compression levels. 2031 */ 2032 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2033 int level)); 2034 2035 extern PNG_EXPORT(void,png_set_compression_mem_level) 2036 PNGARG((png_structp png_ptr, int mem_level)); 2037 2038 extern PNG_EXPORT(void,png_set_compression_strategy) 2039 PNGARG((png_structp png_ptr, int strategy)); 2040 2041 extern PNG_EXPORT(void,png_set_compression_window_bits) 2042 PNGARG((png_structp png_ptr, int window_bits)); 2043 2044 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2045 int method)); 2046 2047 /* These next functions are called for input/output, memory, and error 2048 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2049 * and call standard C I/O routines such as fread(), fwrite(), and 2050 * fprintf(). These functions can be made to use other I/O routines 2051 * at run time for those applications that need to handle I/O in a 2052 * different manner by calling png_set_???_fn(). See libpng.txt for 2053 * more information. 2054 */ 2055 2056 #ifdef PNG_STDIO_SUPPORTED 2057 /* Initialize the input/output for the PNG file to the default functions. */ 2058 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2059 #endif 2060 2061 /* Replace the (error and abort), and warning functions with user 2062 * supplied functions. If no messages are to be printed you must still 2063 * write and use replacement functions. The replacement error_fn should 2064 * still do a longjmp to the last setjmp location if you are using this 2065 * method of error handling. If error_fn or warning_fn is NULL, the 2066 * default function will be used. 2067 */ 2068 2069 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2070 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2071 2072 /* Return the user pointer associated with the error functions */ 2073 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2074 2075 /* Replace the default data output functions with a user supplied one(s). 2076 * If buffered output is not used, then output_flush_fn can be set to NULL. 2077 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2078 * output_flush_fn will be ignored (and thus can be NULL). 2079 * It is probably a mistake to use NULL for output_flush_fn if 2080 * write_data_fn is not also NULL unless you have built libpng with 2081 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2082 * default flush function, which uses the standard *FILE structure, will 2083 * be used. 2084 */ 2085 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2086 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2087 2088 /* Replace the default data input function with a user supplied one. */ 2089 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2090 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2091 2092 /* Return the user pointer associated with the I/O functions */ 2093 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2094 2095 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2096 png_read_status_ptr read_row_fn)); 2097 2098 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2099 png_write_status_ptr write_row_fn)); 2100 2101 #ifdef PNG_USER_MEM_SUPPORTED 2102 /* Replace the default memory allocation functions with user supplied one(s). */ 2103 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2104 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2105 /* Return the user pointer associated with the memory functions */ 2106 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2107 #endif 2108 2109 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2110 defined(PNG_LEGACY_SUPPORTED) 2111 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2112 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2113 #endif 2114 2115 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2116 defined(PNG_LEGACY_SUPPORTED) 2117 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2118 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2119 #endif 2120 2121 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2122 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2123 defined(PNG_LEGACY_SUPPORTED) 2124 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2125 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2126 int user_transform_channels)); 2127 /* Return the user pointer associated with the user transform functions */ 2128 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2129 PNGARG((png_structp png_ptr)); 2130 #endif 2131 2132 #ifdef PNG_USER_CHUNKS_SUPPORTED 2133 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2134 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2135 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2136 png_ptr)); 2137 #endif 2138 2139 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2140 /* Sets the function callbacks for the push reader, and a pointer to a 2141 * user-defined structure available to the callback functions. 2142 */ 2143 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2144 png_voidp progressive_ptr, 2145 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2146 png_progressive_end_ptr end_fn)); 2147 2148 /* Returns the user pointer associated with the push read functions */ 2149 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2150 PNGARG((png_structp png_ptr)); 2151 2152 /* Function to be called when data becomes available */ 2153 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2154 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2155 2156 /* Function that combines rows. Not very much different than the 2157 * png_combine_row() call. Is this even used????? 2158 */ 2159 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2160 png_bytep old_row, png_bytep new_row)); 2161 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2162 2163 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2164 png_uint_32 size)) PNG_ALLOCATED; 2165 2166 #ifdef PNG_1_0_X 2167 # define png_malloc_warn png_malloc 2168 #else 2169 /* Added at libpng version 1.2.4 */ 2170 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2171 png_uint_32 size)) PNG_ALLOCATED; 2172 #endif 2173 2174 /* Frees a pointer allocated by png_malloc() */ 2175 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2176 2177 #ifdef PNG_1_0_X 2178 /* Function to allocate memory for zlib. */ 2179 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2180 uInt size)); 2181 2182 /* Function to free memory for zlib */ 2183 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2184 #endif 2185 2186 /* Free data that was allocated internally */ 2187 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2188 png_infop info_ptr, png_uint_32 free_me, int num)); 2189 #ifdef PNG_FREE_ME_SUPPORTED 2190 /* Reassign responsibility for freeing existing data, whether allocated 2191 * by libpng or by the application 2192 */ 2193 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2194 png_infop info_ptr, int freer, png_uint_32 mask)); 2195 #endif 2196 /* Assignments for png_data_freer */ 2197 #define PNG_DESTROY_WILL_FREE_DATA 1 2198 #define PNG_SET_WILL_FREE_DATA 1 2199 #define PNG_USER_WILL_FREE_DATA 2 2200 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2201 #define PNG_FREE_HIST 0x0008 2202 #define PNG_FREE_ICCP 0x0010 2203 #define PNG_FREE_SPLT 0x0020 2204 #define PNG_FREE_ROWS 0x0040 2205 #define PNG_FREE_PCAL 0x0080 2206 #define PNG_FREE_SCAL 0x0100 2207 #define PNG_FREE_UNKN 0x0200 2208 #define PNG_FREE_LIST 0x0400 2209 #define PNG_FREE_PLTE 0x1000 2210 #define PNG_FREE_TRNS 0x2000 2211 #define PNG_FREE_TEXT 0x4000 2212 #define PNG_FREE_ALL 0x7fff 2213 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2214 2215 #ifdef PNG_USER_MEM_SUPPORTED 2216 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2217 png_uint_32 size)) PNG_ALLOCATED; 2218 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2219 png_voidp ptr)); 2220 #endif 2221 2222 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2223 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2224 2225 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2226 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2227 2228 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2229 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2230 int check)); 2231 #endif /* USE_FAR_KEYWORD */ 2232 2233 #ifndef PNG_NO_ERROR_TEXT 2234 /* Fatal error in PNG image of libpng - can't continue */ 2235 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2236 png_const_charp error_message)) PNG_NORETURN; 2237 2238 /* The same, but the chunk name is prepended to the error string. */ 2239 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2240 png_const_charp error_message)) PNG_NORETURN; 2241 #else 2242 /* Fatal error in PNG image of libpng - can't continue */ 2243 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2244 #endif 2245 2246 #ifndef PNG_NO_WARNINGS 2247 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2248 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2249 png_const_charp warning_message)); 2250 2251 #ifdef PNG_READ_SUPPORTED 2252 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2253 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2254 png_const_charp warning_message)); 2255 #endif /* PNG_READ_SUPPORTED */ 2256 #endif /* PNG_NO_WARNINGS */ 2257 2258 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2259 * Similarly, the png_get_<chunk> calls are used to read values from the 2260 * png_info_struct, either storing the parameters in the passed variables, or 2261 * setting pointers into the png_info_struct where the data is stored. The 2262 * png_get_<chunk> functions return a non-zero value if the data was available 2263 * in info_ptr, or return zero and do not change any of the parameters if the 2264 * data was not available. 2265 * 2266 * These functions should be used instead of directly accessing png_info 2267 * to avoid problems with future changes in the size and internal layout of 2268 * png_info_struct. 2269 */ 2270 /* Returns "flag" if chunk data is valid in info_ptr. */ 2271 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2272 png_infop info_ptr, png_uint_32 flag)); 2273 2274 /* Returns number of bytes needed to hold a transformed row. */ 2275 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2276 png_infop info_ptr)); 2277 2278 #ifdef PNG_INFO_IMAGE_SUPPORTED 2279 /* Returns row_pointers, which is an array of pointers to scanlines that was 2280 * returned from png_read_png(). 2281 */ 2282 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2283 png_infop info_ptr)); 2284 /* Set row_pointers, which is an array of pointers to scanlines for use 2285 * by png_write_png(). 2286 */ 2287 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2288 png_infop info_ptr, png_bytepp row_pointers)); 2289 #endif 2290 2291 /* Returns number of color channels in image. */ 2292 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2293 png_infop info_ptr)); 2294 2295 #ifdef PNG_EASY_ACCESS_SUPPORTED 2296 /* Returns image width in pixels. */ 2297 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2298 png_ptr, png_infop info_ptr)); 2299 2300 /* Returns image height in pixels. */ 2301 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2302 png_ptr, png_infop info_ptr)); 2303 2304 /* Returns image bit_depth. */ 2305 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2306 png_ptr, png_infop info_ptr)); 2307 2308 /* Returns image color_type. */ 2309 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2310 png_ptr, png_infop info_ptr)); 2311 2312 /* Returns image filter_type. */ 2313 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2314 png_ptr, png_infop info_ptr)); 2315 2316 /* Returns image interlace_type. */ 2317 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2318 png_ptr, png_infop info_ptr)); 2319 2320 /* Returns image compression_type. */ 2321 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2322 png_ptr, png_infop info_ptr)); 2323 2324 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2325 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2326 png_ptr, png_infop info_ptr)); 2327 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2328 png_ptr, png_infop info_ptr)); 2329 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2330 png_ptr, png_infop info_ptr)); 2331 2332 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2333 #ifdef PNG_FLOATING_POINT_SUPPORTED 2334 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2335 png_ptr, png_infop info_ptr)); 2336 #endif 2337 2338 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2339 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2340 png_ptr, png_infop info_ptr)); 2341 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2342 png_ptr, png_infop info_ptr)); 2343 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2344 png_ptr, png_infop info_ptr)); 2345 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2346 png_ptr, png_infop info_ptr)); 2347 2348 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2349 2350 /* Returns pointer to signature string read from PNG header */ 2351 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2352 png_infop info_ptr)); 2353 2354 #ifdef PNG_bKGD_SUPPORTED 2355 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2356 png_infop info_ptr, png_color_16p *background)); 2357 #endif 2358 2359 #ifdef PNG_bKGD_SUPPORTED 2360 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2361 png_infop info_ptr, png_color_16p background)); 2362 #endif 2363 2364 #ifdef PNG_cHRM_SUPPORTED 2365 #ifdef PNG_FLOATING_POINT_SUPPORTED 2366 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2367 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2368 double *red_y, double *green_x, double *green_y, double *blue_x, 2369 double *blue_y)); 2370 #endif 2371 #ifdef PNG_FIXED_POINT_SUPPORTED 2372 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2373 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2374 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2375 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2376 *int_blue_x, png_fixed_point *int_blue_y)); 2377 #endif 2378 #endif 2379 2380 #ifdef PNG_cHRM_SUPPORTED 2381 #ifdef PNG_FLOATING_POINT_SUPPORTED 2382 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2383 png_infop info_ptr, double white_x, double white_y, double red_x, 2384 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2385 #endif 2386 #ifdef PNG_FIXED_POINT_SUPPORTED 2387 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2388 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2389 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2390 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2391 png_fixed_point int_blue_y)); 2392 #endif 2393 #endif 2394 2395 #ifdef PNG_gAMA_SUPPORTED 2396 #ifdef PNG_FLOATING_POINT_SUPPORTED 2397 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2398 png_infop info_ptr, double *file_gamma)); 2399 #endif 2400 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2401 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2402 #endif 2403 2404 #ifdef PNG_gAMA_SUPPORTED 2405 #ifdef PNG_FLOATING_POINT_SUPPORTED 2406 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2407 png_infop info_ptr, double file_gamma)); 2408 #endif 2409 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2410 png_infop info_ptr, png_fixed_point int_file_gamma)); 2411 #endif 2412 2413 #ifdef PNG_hIST_SUPPORTED 2414 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2415 png_infop info_ptr, png_uint_16p *hist)); 2416 #endif 2417 2418 #ifdef PNG_hIST_SUPPORTED 2419 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2420 png_infop info_ptr, png_uint_16p hist)); 2421 #endif 2422 2423 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2424 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2425 int *bit_depth, int *color_type, int *interlace_method, 2426 int *compression_method, int *filter_method)); 2427 2428 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2429 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2430 int color_type, int interlace_method, int compression_method, 2431 int filter_method)); 2432 2433 #ifdef PNG_oFFs_SUPPORTED 2434 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2435 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2436 int *unit_type)); 2437 #endif 2438 2439 #ifdef PNG_oFFs_SUPPORTED 2440 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2441 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2442 int unit_type)); 2443 #endif 2444 2445 #ifdef PNG_pCAL_SUPPORTED 2446 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2447 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2448 int *type, int *nparams, png_charp *units, png_charpp *params)); 2449 #endif 2450 2451 #ifdef PNG_pCAL_SUPPORTED 2452 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2453 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2454 int type, int nparams, png_charp units, png_charpp params)); 2455 #endif 2456 2457 #ifdef PNG_pHYs_SUPPORTED 2458 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2459 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2460 #endif 2461 2462 #ifdef PNG_pHYs_SUPPORTED 2463 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2464 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2465 #endif 2466 2467 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2468 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2469 2470 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2471 png_infop info_ptr, png_colorp palette, int num_palette)); 2472 2473 #ifdef PNG_sBIT_SUPPORTED 2474 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2475 png_infop info_ptr, png_color_8p *sig_bit)); 2476 #endif 2477 2478 #ifdef PNG_sBIT_SUPPORTED 2479 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2480 png_infop info_ptr, png_color_8p sig_bit)); 2481 #endif 2482 2483 #ifdef PNG_sRGB_SUPPORTED 2484 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2485 png_infop info_ptr, int *intent)); 2486 #endif 2487 2488 #ifdef PNG_sRGB_SUPPORTED 2489 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2490 png_infop info_ptr, int intent)); 2491 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2492 png_infop info_ptr, int intent)); 2493 #endif 2494 2495 #ifdef PNG_iCCP_SUPPORTED 2496 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2497 png_infop info_ptr, png_charpp name, int *compression_type, 2498 png_charpp profile, png_uint_32 *proflen)); 2499 /* Note to maintainer: profile should be png_bytepp */ 2500 #endif 2501 2502 #ifdef PNG_iCCP_SUPPORTED 2503 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2504 png_infop info_ptr, png_charp name, int compression_type, 2505 png_charp profile, png_uint_32 proflen)); 2506 /* Note to maintainer: profile should be png_bytep */ 2507 #endif 2508 2509 #ifdef PNG_sPLT_SUPPORTED 2510 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2511 png_infop info_ptr, png_sPLT_tpp entries)); 2512 #endif 2513 2514 #ifdef PNG_sPLT_SUPPORTED 2515 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2516 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2517 #endif 2518 2519 #ifdef PNG_TEXT_SUPPORTED 2520 /* png_get_text also returns the number of text chunks in *num_text */ 2521 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2522 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2523 #endif 2524 2525 /* 2526 * Note while png_set_text() will accept a structure whose text, 2527 * language, and translated keywords are NULL pointers, the structure 2528 * returned by png_get_text will always contain regular 2529 * zero-terminated C strings. They might be empty strings but 2530 * they will never be NULL pointers. 2531 */ 2532 2533 #ifdef PNG_TEXT_SUPPORTED 2534 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2535 png_infop info_ptr, png_textp text_ptr, int num_text)); 2536 #endif 2537 2538 #ifdef PNG_tIME_SUPPORTED 2539 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2540 png_infop info_ptr, png_timep *mod_time)); 2541 #endif 2542 2543 #ifdef PNG_tIME_SUPPORTED 2544 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2545 png_infop info_ptr, png_timep mod_time)); 2546 #endif 2547 2548 #ifdef PNG_tRNS_SUPPORTED 2549 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2550 png_infop info_ptr, png_bytep *trans, int *num_trans, 2551 png_color_16p *trans_values)); 2552 #endif 2553 2554 #ifdef PNG_tRNS_SUPPORTED 2555 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2556 png_infop info_ptr, png_bytep trans, int num_trans, 2557 png_color_16p trans_values)); 2558 #endif 2559 2560 #ifdef PNG_tRNS_SUPPORTED 2561 #endif 2562 2563 #ifdef PNG_sCAL_SUPPORTED 2564 #ifdef PNG_FLOATING_POINT_SUPPORTED 2565 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2566 png_infop info_ptr, int *unit, double *width, double *height)); 2567 #else 2568 #ifdef PNG_FIXED_POINT_SUPPORTED 2569 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2570 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2571 #endif 2572 #endif 2573 #endif /* PNG_sCAL_SUPPORTED */ 2574 2575 #ifdef PNG_sCAL_SUPPORTED 2576 #ifdef PNG_FLOATING_POINT_SUPPORTED 2577 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2578 png_infop info_ptr, int unit, double width, double height)); 2579 #else 2580 #ifdef PNG_FIXED_POINT_SUPPORTED 2581 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2582 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2583 #endif 2584 #endif 2585 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2586 2587 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2588 /* Provide a list of chunks and how they are to be handled, if the built-in 2589 handling or default unknown chunk handling is not desired. Any chunks not 2590 listed will be handled in the default manner. The IHDR and IEND chunks 2591 must not be listed. 2592 keep = 0: follow default behaviour 2593 = 1: do not keep 2594 = 2: keep only if safe-to-copy 2595 = 3: keep even if unsafe-to-copy 2596 */ 2597 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2598 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2599 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2600 chunk_name)); 2601 #endif 2602 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2603 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2604 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2605 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2606 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2607 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2608 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2609 #endif 2610 2611 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2612 * If you need to turn it off for a chunk that your application has freed, 2613 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2614 */ 2615 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2616 png_infop info_ptr, int mask)); 2617 2618 #ifdef PNG_INFO_IMAGE_SUPPORTED 2619 /* The "params" pointer is currently not used and is for future expansion. */ 2620 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2621 png_infop info_ptr, 2622 int transforms, 2623 png_voidp params)); 2624 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2625 png_infop info_ptr, 2626 int transforms, 2627 png_voidp params)); 2628 #endif 2629 2630 /* Define PNG_DEBUG at compile time for debugging information. Higher 2631 * numbers for PNG_DEBUG mean more debugging information. This has 2632 * only been added since version 0.95 so it is not implemented throughout 2633 * libpng yet, but more support will be added as needed. 2634 */ 2635 #ifdef PNG_DEBUG 2636 #if (PNG_DEBUG > 0) 2637 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2638 #include <crtdbg.h> 2639 #if (PNG_DEBUG > 1) 2640 #ifndef _DEBUG 2641 # define _DEBUG 2642 #endif 2643 #ifndef png_debug 2644 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2645 #endif 2646 #ifndef png_debug1 2647 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2648 #endif 2649 #ifndef png_debug2 2650 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2651 #endif 2652 #endif 2653 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2654 #ifndef PNG_DEBUG_FILE 2655 #define PNG_DEBUG_FILE stderr 2656 #endif /* PNG_DEBUG_FILE */ 2657 2658 #if (PNG_DEBUG > 1) 2659 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2660 * compilers. 2661 */ 2662 # ifdef __STDC__ 2663 # ifndef png_debug 2664 # define png_debug(l,m) \ 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":"")))); \ 2669 } 2670 # endif 2671 # ifndef png_debug1 2672 # define png_debug1(l,m,p1) \ 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); \ 2677 } 2678 # endif 2679 # ifndef png_debug2 2680 # define png_debug2(l,m,p1,p2) \ 2681 { \ 2682 int num_tabs=l; \ 2683 fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2684 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2685 } 2686 # endif 2687 # else /* __STDC __ */ 2688 # ifndef png_debug 2689 # define png_debug(l,m) \ 2690 { \ 2691 int num_tabs=l; \ 2692 char format[256]; \ 2693 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2694 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2695 m,PNG_STRING_NEWLINE); \ 2696 fprintf(PNG_DEBUG_FILE,format); \ 2697 } 2698 # endif 2699 # ifndef png_debug1 2700 # define png_debug1(l,m,p1) \ 2701 { \ 2702 int num_tabs=l; \ 2703 char format[256]; \ 2704 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2705 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2706 m,PNG_STRING_NEWLINE); \ 2707 fprintf(PNG_DEBUG_FILE,format,p1); \ 2708 } 2709 # endif 2710 # ifndef png_debug2 2711 # define png_debug2(l,m,p1,p2) \ 2712 { \ 2713 int num_tabs=l; \ 2714 char format[256]; \ 2715 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2716 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2717 m,PNG_STRING_NEWLINE); \ 2718 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2719 } 2720 # endif 2721 # endif /* __STDC __ */ 2722 #endif /* (PNG_DEBUG > 1) */ 2723 2724 #endif /* _MSC_VER */ 2725 #endif /* (PNG_DEBUG > 0) */ 2726 #endif /* PNG_DEBUG */ 2727 #ifndef png_debug 2728 #define png_debug(l, m) 2729 #endif 2730 #ifndef png_debug1 2731 #define png_debug1(l, m, p1) 2732 #endif 2733 #ifndef png_debug2 2734 #define png_debug2(l, m, p1, p2) 2735 #endif 2736 2737 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2738 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2739 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2740 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2741 2742 #ifdef PNG_MNG_FEATURES_SUPPORTED 2743 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2744 png_ptr, png_uint_32 mng_features_permitted)); 2745 #endif 2746 2747 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2748 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2749 #define PNG_HANDLE_CHUNK_NEVER 1 2750 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2751 #define PNG_HANDLE_CHUNK_ALWAYS 3 2752 2753 /* Added to version 1.2.0 */ 2754 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2755 #ifdef PNG_MMX_CODE_SUPPORTED 2756 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2757 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2758 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2759 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2760 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2761 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2762 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2763 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2764 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2765 2766 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2767 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2768 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2769 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2770 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2771 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2772 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2773 2774 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2775 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2776 | PNG_MMX_READ_FLAGS \ 2777 | PNG_MMX_WRITE_FLAGS ) 2778 2779 #define PNG_SELECT_READ 1 2780 #define PNG_SELECT_WRITE 2 2781 #endif /* PNG_MMX_CODE_SUPPORTED */ 2782 2783 #ifndef PNG_1_0_X 2784 /* pngget.c */ 2785 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2786 PNGARG((int flag_select, int *compilerID)); 2787 2788 /* pngget.c */ 2789 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2790 PNGARG((int flag_select)); 2791 2792 /* pngget.c */ 2793 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2794 PNGARG((png_structp png_ptr)); 2795 2796 /* pngget.c */ 2797 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2798 PNGARG((png_structp png_ptr)); 2799 2800 /* pngget.c */ 2801 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2802 PNGARG((png_structp png_ptr)); 2803 2804 /* pngset.c */ 2805 extern PNG_EXPORT(void,png_set_asm_flags) 2806 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2807 2808 /* pngset.c */ 2809 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2810 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2811 png_uint_32 mmx_rowbytes_threshold)); 2812 2813 #endif /* PNG_1_0_X */ 2814 2815 #ifndef PNG_1_0_X 2816 /* png.c, pnggccrd.c, or pngvcrd.c */ 2817 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2818 #endif /* PNG_1_0_X */ 2819 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2820 2821 /* Strip the prepended error numbers ("#nnn ") from error and warning 2822 * messages before passing them to the error or warning handler. 2823 */ 2824 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2825 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2826 png_ptr, png_uint_32 strip_mode)); 2827 #endif 2828 2829 /* Added at libpng-1.2.6 */ 2830 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2831 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2832 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2833 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2834 png_ptr)); 2835 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2836 png_ptr)); 2837 #endif 2838 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2839 * project defs 2840 */ 2841 2842 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2843 /* With these routines we avoid an integer divide, which will be slower on 2844 * most machines. However, it does take more operations than the corresponding 2845 * divide method, so it may be slower on a few RISC systems. There are two 2846 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2847 * 2848 * Note that the rounding factors are NOT supposed to be the same! 128 and 2849 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2850 * standard method. 2851 * 2852 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2853 */ 2854 2855 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2856 2857 # define png_composite(composite, fg, alpha, bg) \ 2858 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2859 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2860 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2861 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2862 2863 # define png_composite_16(composite, fg, alpha, bg) \ 2864 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2865 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2866 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2867 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2868 2869 #else /* Standard method using integer division */ 2870 2871 # define png_composite(composite, fg, alpha, bg) \ 2872 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2873 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2874 (png_uint_16)127) / 255) 2875 2876 # define png_composite_16(composite, fg, alpha, bg) \ 2877 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2878 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2879 (png_uint_32)32767) / (png_uint_32)65535L) 2880 2881 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2882 2883 /* Inline macros to do direct reads of bytes from the input buffer. These 2884 * require that you are using an architecture that uses PNG byte ordering 2885 * (MSB first) and supports unaligned data storage. I think that PowerPC 2886 * in big-endian mode and 680x0 are the only ones that will support this. 2887 * The x86 line of processors definitely do not. The png_get_int_32() 2888 * routine also assumes we are using two's complement format for negative 2889 * values, which is almost certainly true. 2890 */ 2891 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2892 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2893 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2894 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2895 #else 2896 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2897 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2898 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2899 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2900 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2901 PNGARG((png_structp png_ptr, png_bytep buf)); 2902 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2903 2904 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2905 */ 2906 extern PNG_EXPORT(void,png_save_uint_32) 2907 PNGARG((png_bytep buf, png_uint_32 i)); 2908 extern PNG_EXPORT(void,png_save_int_32) 2909 PNGARG((png_bytep buf, png_int_32 i)); 2910 2911 /* Place a 16-bit number into a buffer in PNG byte order. 2912 * The parameter is declared unsigned int, not png_uint_16, 2913 * just to avoid potential problems on pre-ANSI C compilers. 2914 */ 2915 extern PNG_EXPORT(void,png_save_uint_16) 2916 PNGARG((png_bytep buf, unsigned int i)); 2917 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2918 2919 /* ************************************************************************* */ 2920 2921 /* These next functions are used internally in the code. They generally 2922 * shouldn't be used unless you are writing code to add or replace some 2923 * functionality in libpng. More information about most functions can 2924 * be found in the files where the functions are located. 2925 */ 2926 2927 2928 /* Various modes of operation, that are visible to applications because 2929 * they are used for unknown chunk location. 2930 */ 2931 #define PNG_HAVE_IHDR 0x01 2932 #define PNG_HAVE_PLTE 0x02 2933 #define PNG_HAVE_IDAT 0x04 2934 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2935 #define PNG_HAVE_IEND 0x10 2936 2937 #ifdef PNG_INTERNAL 2938 2939 /* More modes of operation. Note that after an init, mode is set to 2940 * zero automatically when the structure is created. 2941 */ 2942 #define PNG_HAVE_gAMA 0x20 2943 #define PNG_HAVE_cHRM 0x40 2944 #define PNG_HAVE_sRGB 0x80 2945 #define PNG_HAVE_CHUNK_HEADER 0x100 2946 #define PNG_WROTE_tIME 0x200 2947 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2948 #define PNG_BACKGROUND_IS_GRAY 0x800 2949 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2950 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2951 2952 /* Flags for the transformations the PNG library does on the image data */ 2953 #define PNG_BGR 0x0001 2954 #define PNG_INTERLACE 0x0002 2955 #define PNG_PACK 0x0004 2956 #define PNG_SHIFT 0x0008 2957 #define PNG_SWAP_BYTES 0x0010 2958 #define PNG_INVERT_MONO 0x0020 2959 #define PNG_DITHER 0x0040 2960 #define PNG_BACKGROUND 0x0080 2961 #define PNG_BACKGROUND_EXPAND 0x0100 2962 /* 0x0200 unused */ 2963 #define PNG_16_TO_8 0x0400 2964 #define PNG_RGBA 0x0800 2965 #define PNG_EXPAND 0x1000 2966 #define PNG_GAMMA 0x2000 2967 #define PNG_GRAY_TO_RGB 0x4000 2968 #define PNG_FILLER 0x8000L 2969 #define PNG_PACKSWAP 0x10000L 2970 #define PNG_SWAP_ALPHA 0x20000L 2971 #define PNG_STRIP_ALPHA 0x40000L 2972 #define PNG_INVERT_ALPHA 0x80000L 2973 #define PNG_USER_TRANSFORM 0x100000L 2974 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2975 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2976 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2977 /* 0x800000L Unused */ 2978 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2979 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2980 #define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 2981 /* by volker */ 2982 /* 0x8000000L unused */ 2983 /* 0x10000000L unused */ 2984 /* 0x20000000L unused */ 2985 /* 0x40000000L unused */ 2986 2987 /* Flags for png_create_struct */ 2988 #define PNG_STRUCT_PNG 0x0001 2989 #define PNG_STRUCT_INFO 0x0002 2990 2991 /* Scaling factor for filter heuristic weighting calculations */ 2992 #define PNG_WEIGHT_SHIFT 8 2993 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2994 #define PNG_COST_SHIFT 3 2995 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2996 2997 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2998 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2999 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 3000 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 3001 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 3002 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 3003 #define PNG_FLAG_ZLIB_FINISHED 0x0020 3004 #define PNG_FLAG_ROW_INIT 0x0040 3005 #define PNG_FLAG_FILLER_AFTER 0x0080 3006 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 3007 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 3008 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 3009 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 3010 #define PNG_FLAG_FREE_PLTE 0x1000 3011 #define PNG_FLAG_FREE_TRNS 0x2000 3012 #define PNG_FLAG_FREE_HIST 0x4000 3013 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 3014 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 3015 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 3016 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 3017 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 3018 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 3019 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 3020 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 3021 /* 0x800000L unused */ 3022 /* 0x1000000L unused */ 3023 /* 0x2000000L unused */ 3024 /* 0x4000000L unused */ 3025 /* 0x8000000L unused */ 3026 /* 0x10000000L unused */ 3027 /* 0x20000000L unused */ 3028 /* 0x40000000L unused */ 3029 3030 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3031 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3032 3033 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3034 PNG_FLAG_CRC_CRITICAL_IGNORE) 3035 3036 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3037 PNG_FLAG_CRC_CRITICAL_MASK) 3038 3039 /* Save typing and make code easier to understand */ 3040 3041 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3042 abs((int)((c1).green) - (int)((c2).green)) + \ 3043 abs((int)((c1).blue) - (int)((c2).blue))) 3044 3045 /* Added to libpng-1.2.6 JB */ 3046 #define PNG_ROWBYTES(pixel_bits, width) \ 3047 ((pixel_bits) >= 8 ? \ 3048 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3049 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3050 3051 /* PNG_OUT_OF_RANGE returns true if value is outside the range 3052 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3053 * "ideal" and "delta" should be constants, normally simple 3054 * integers, "value" a variable. Added to libpng-1.2.6 JB 3055 */ 3056 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3057 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3058 3059 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3060 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3061 /* Place to hold the signature string for a PNG file. */ 3062 #ifdef PNG_USE_GLOBAL_ARRAYS 3063 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3064 #else 3065 #endif 3066 #endif /* PNG_NO_EXTERN */ 3067 3068 /* Constant strings for known chunk types. If you need to add a chunk, 3069 * define the name here, and add an invocation of the macro in png.c and 3070 * wherever it's needed. 3071 */ 3072 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3073 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3074 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3075 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3076 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3077 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3078 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3079 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3080 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3081 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3082 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3083 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3084 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3085 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3086 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3087 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3088 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3089 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3090 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3091 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3092 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3093 3094 #ifdef PNG_USE_GLOBAL_ARRAYS 3095 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3096 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3097 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3098 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3099 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3100 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3101 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3102 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3103 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3104 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3105 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3106 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3107 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3108 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3109 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3110 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3111 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3112 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3113 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3114 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3115 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3116 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3117 3118 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3119 /* Initialize png_ptr struct for reading, and allocate any other memory. 3120 * (old interface - DEPRECATED - use png_create_read_struct instead). 3121 */ 3122 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3123 PNG_DEPRECATED; 3124 #undef png_read_init 3125 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3126 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3127 #endif 3128 3129 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3130 png_const_charp user_png_ver, png_size_t png_struct_size)); 3131 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3132 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3133 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3134 png_info_size)); 3135 #endif 3136 3137 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3138 /* Initialize png_ptr struct for writing, and allocate any other memory. 3139 * (old interface - DEPRECATED - use png_create_write_struct instead). 3140 */ 3141 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3142 PNG_DEPRECATED; 3143 #undef png_write_init 3144 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3145 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3146 #endif 3147 3148 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3149 png_const_charp user_png_ver, png_size_t png_struct_size)); 3150 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3151 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3152 png_info_size)); 3153 3154 /* Allocate memory for an internal libpng struct */ 3155 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3156 3157 /* Free memory from internal libpng struct */ 3158 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3159 3160 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3161 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3162 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3163 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3164 3165 /* Free any memory that info_ptr points to and reset struct. */ 3166 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3167 png_infop info_ptr)) PNG_PRIVATE; 3168 3169 #ifndef PNG_1_0_X 3170 /* Function to allocate memory for zlib. */ 3171 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3172 uInt size)) PNG_PRIVATE; 3173 3174 /* Function to free memory for zlib */ 3175 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3176 3177 #ifdef PNG_SIZE_T 3178 /* Function to convert a sizeof an item to png_sizeof item */ 3179 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3180 PNG_PRIVATE; 3181 #endif 3182 3183 /* Next four functions are used internally as callbacks. PNGAPI is required 3184 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3185 */ 3186 3187 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3188 png_bytep data, png_size_t length)) PNG_PRIVATE; 3189 3190 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3191 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3192 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3193 #endif 3194 3195 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3196 png_bytep data, png_size_t length)) PNG_PRIVATE; 3197 3198 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3199 #ifdef PNG_STDIO_SUPPORTED 3200 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3201 PNG_PRIVATE; 3202 #endif 3203 #endif 3204 #else /* PNG_1_0_X */ 3205 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3206 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3207 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3208 #endif 3209 #endif /* PNG_1_0_X */ 3210 3211 /* Reset the CRC variable */ 3212 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3213 3214 /* Write the "data" buffer to whatever output you are using. */ 3215 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3216 png_size_t length)) PNG_PRIVATE; 3217 3218 /* Read data from whatever input you are using into the "data" buffer */ 3219 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3220 png_size_t length)) PNG_PRIVATE; 3221 3222 /* Read bytes into buf, and update png_ptr->crc */ 3223 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3224 png_size_t length)) PNG_PRIVATE; 3225 3226 /* Decompress data in a chunk that uses compression */ 3227 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3228 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3229 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3230 int comp_type, png_size_t chunklength, 3231 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3232 #endif 3233 3234 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3235 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3236 PNG_PRIVATE); 3237 3238 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3239 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3240 3241 /* Calculate the CRC over a section of data. Note that we are only 3242 * passing a maximum of 64K on systems that have this as a memory limit, 3243 * since this is the maximum buffer size we can specify. 3244 */ 3245 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3246 png_size_t length)) PNG_PRIVATE; 3247 3248 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3249 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3250 #endif 3251 3252 /* Simple function to write the signature */ 3253 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3254 3255 /* Write various chunks */ 3256 3257 /* Write the IHDR chunk, and update the png_struct with the necessary 3258 * information. 3259 */ 3260 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3261 png_uint_32 height, 3262 int bit_depth, int color_type, int compression_method, int filter_method, 3263 int interlace_method)) PNG_PRIVATE; 3264 3265 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3266 png_uint_32 num_pal)) PNG_PRIVATE; 3267 3268 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3269 png_size_t length)) PNG_PRIVATE; 3270 3271 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3272 3273 #ifdef PNG_WRITE_gAMA_SUPPORTED 3274 #ifdef PNG_FLOATING_POINT_SUPPORTED 3275 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3276 PNG_PRIVATE; 3277 #endif 3278 #ifdef PNG_FIXED_POINT_SUPPORTED 3279 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3280 png_fixed_point file_gamma)) PNG_PRIVATE; 3281 #endif 3282 #endif 3283 3284 #ifdef PNG_WRITE_sBIT_SUPPORTED 3285 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3286 int color_type)) PNG_PRIVATE; 3287 #endif 3288 3289 #ifdef PNG_WRITE_cHRM_SUPPORTED 3290 #ifdef PNG_FLOATING_POINT_SUPPORTED 3291 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3292 double white_x, double white_y, 3293 double red_x, double red_y, double green_x, double green_y, 3294 double blue_x, double blue_y)) PNG_PRIVATE; 3295 #endif 3296 #ifdef PNG_FIXED_POINT_SUPPORTED 3297 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3298 png_fixed_point int_white_x, png_fixed_point int_white_y, 3299 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3300 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3301 png_fixed_point int_blue_y)) PNG_PRIVATE; 3302 #endif 3303 #endif 3304 3305 #ifdef PNG_WRITE_sRGB_SUPPORTED 3306 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3307 int intent)) PNG_PRIVATE; 3308 #endif 3309 3310 #ifdef PNG_WRITE_iCCP_SUPPORTED 3311 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3312 png_charp name, int compression_type, 3313 png_charp profile, int proflen)) PNG_PRIVATE; 3314 /* Note to maintainer: profile should be png_bytep */ 3315 #endif 3316 3317 #ifdef PNG_WRITE_sPLT_SUPPORTED 3318 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3319 png_sPLT_tp palette)) PNG_PRIVATE; 3320 #endif 3321 3322 #ifdef PNG_WRITE_tRNS_SUPPORTED 3323 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3324 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3325 #endif 3326 3327 #ifdef PNG_WRITE_bKGD_SUPPORTED 3328 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3329 png_color_16p values, int color_type)) PNG_PRIVATE; 3330 #endif 3331 3332 #ifdef PNG_WRITE_hIST_SUPPORTED 3333 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3334 int num_hist)) PNG_PRIVATE; 3335 #endif 3336 3337 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3338 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3339 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3340 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3341 #endif 3342 3343 #ifdef PNG_WRITE_tEXt_SUPPORTED 3344 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3345 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3346 #endif 3347 3348 #ifdef PNG_WRITE_zTXt_SUPPORTED 3349 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3350 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3351 #endif 3352 3353 #ifdef PNG_WRITE_iTXt_SUPPORTED 3354 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3355 int compression, png_charp key, png_charp lang, png_charp lang_key, 3356 png_charp text)) PNG_PRIVATE; 3357 #endif 3358 3359 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3360 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3361 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3362 #endif 3363 3364 #ifdef PNG_WRITE_oFFs_SUPPORTED 3365 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3366 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3367 #endif 3368 3369 #ifdef PNG_WRITE_pCAL_SUPPORTED 3370 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3371 png_int_32 X0, png_int_32 X1, int type, int nparams, 3372 png_charp units, png_charpp params)) PNG_PRIVATE; 3373 #endif 3374 3375 #ifdef PNG_WRITE_pHYs_SUPPORTED 3376 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3377 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3378 int unit_type)) PNG_PRIVATE; 3379 #endif 3380 3381 #ifdef PNG_WRITE_tIME_SUPPORTED 3382 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3383 png_timep mod_time)) PNG_PRIVATE; 3384 #endif 3385 3386 #ifdef PNG_WRITE_sCAL_SUPPORTED 3387 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3388 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3389 int unit, double width, double height)) PNG_PRIVATE; 3390 #else 3391 #ifdef PNG_FIXED_POINT_SUPPORTED 3392 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3393 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3394 #endif 3395 #endif 3396 #endif 3397 3398 /* Called when finished processing a row of data */ 3399 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3400 3401 /* Internal use only. Called before first row of data */ 3402 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3403 3404 #ifdef PNG_READ_GAMMA_SUPPORTED 3405 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3406 #endif 3407 3408 /* Combine a row of data, dealing with alpha, etc. if requested */ 3409 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3410 int mask)) PNG_PRIVATE; 3411 3412 #ifdef PNG_READ_INTERLACING_SUPPORTED 3413 /* Expand an interlaced row */ 3414 /* OLD pre-1.0.9 interface: 3415 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3416 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3417 */ 3418 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3419 #endif 3420 3421 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3422 3423 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 3424 /* Grab pixels out of a row for an interlaced pass */ 3425 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3426 png_bytep row, int pass)) PNG_PRIVATE; 3427 #endif 3428 3429 /* Unfilter a row */ 3430 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3431 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3432 int filter)) PNG_PRIVATE; 3433 3434 /* Choose the best filter to use and filter the row data */ 3435 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3436 png_row_infop row_info)) PNG_PRIVATE; 3437 3438 /* Write out the filtered row. */ 3439 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3440 png_bytep filtered_row)) PNG_PRIVATE; 3441 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3442 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3443 3444 /* Initialize the row buffers, etc. */ 3445 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3446 /* Optional call to update the users info structure */ 3447 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3448 png_infop info_ptr)) PNG_PRIVATE; 3449 3450 /* These are the functions that do the transformations */ 3451 #ifdef PNG_READ_FILLER_SUPPORTED 3452 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3453 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3454 #endif 3455 3456 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3457 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3458 png_bytep row)) PNG_PRIVATE; 3459 #endif 3460 3461 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3462 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3463 png_bytep row)) PNG_PRIVATE; 3464 #endif 3465 3466 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3467 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3468 png_bytep row)) PNG_PRIVATE; 3469 #endif 3470 3471 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3472 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3473 png_bytep row)) PNG_PRIVATE; 3474 #endif 3475 3476 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3477 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3478 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3479 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3480 #endif 3481 3482 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3483 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3484 png_bytep row)) PNG_PRIVATE; 3485 #endif 3486 3487 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3488 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3489 png_bytep row)) PNG_PRIVATE; 3490 #endif 3491 3492 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3493 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3494 row_info, png_bytep row)) PNG_PRIVATE; 3495 #endif 3496 3497 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3498 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3499 png_bytep row)) PNG_PRIVATE; 3500 #endif 3501 3502 #ifdef PNG_READ_PACK_SUPPORTED 3503 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3504 png_bytep row)) PNG_PRIVATE; 3505 #endif 3506 3507 #ifdef PNG_READ_SHIFT_SUPPORTED 3508 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3509 png_color_8p sig_bits)) PNG_PRIVATE; 3510 #endif 3511 3512 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3513 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3514 png_bytep row)) PNG_PRIVATE; 3515 #endif 3516 3517 #ifdef PNG_READ_16_TO_8_SUPPORTED 3518 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3519 png_bytep row)) PNG_PRIVATE; 3520 #endif 3521 3522 #ifdef PNG_READ_DITHER_SUPPORTED 3523 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3524 png_bytep row, png_bytep palette_lookup, 3525 png_bytep dither_lookup)) PNG_PRIVATE; 3526 3527 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 3528 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3529 png_colorp palette, int num_palette)) PNG_PRIVATE; 3530 # endif 3531 #endif 3532 3533 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3534 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3535 png_bytep row)) PNG_PRIVATE; 3536 #endif 3537 3538 #ifdef PNG_WRITE_PACK_SUPPORTED 3539 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3540 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3541 #endif 3542 3543 #ifdef PNG_WRITE_SHIFT_SUPPORTED 3544 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3545 png_color_8p bit_depth)) PNG_PRIVATE; 3546 #endif 3547 3548 #ifdef PNG_READ_BACKGROUND_SUPPORTED 3549 #ifdef PNG_READ_GAMMA_SUPPORTED 3550 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3551 png_color_16p trans_values, png_color_16p background, 3552 png_color_16p background_1, 3553 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3554 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3555 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3556 #else 3557 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3558 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3559 #endif 3560 #endif 3561 3562 #ifdef PNG_READ_GAMMA_SUPPORTED 3563 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3564 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3565 int gamma_shift)) PNG_PRIVATE; 3566 #endif 3567 3568 #ifdef PNG_READ_EXPAND_SUPPORTED 3569 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3570 png_bytep row, png_colorp palette, png_bytep trans, 3571 int num_trans)) PNG_PRIVATE; 3572 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3573 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3574 #endif 3575 3576 /* The following decodes the appropriate chunks, and does error correction, 3577 * then calls the appropriate callback for the chunk if it is valid. 3578 */ 3579 3580 /* Decode the IHDR chunk */ 3581 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3582 png_uint_32 length)) PNG_PRIVATE; 3583 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3584 png_uint_32 length)); 3585 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3586 png_uint_32 length)); 3587 3588 #ifdef PNG_READ_bKGD_SUPPORTED 3589 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3590 png_uint_32 length)) PNG_PRIVATE; 3591 #endif 3592 3593 #ifdef PNG_READ_cHRM_SUPPORTED 3594 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3595 png_uint_32 length)) PNG_PRIVATE; 3596 #endif 3597 3598 #ifdef PNG_READ_gAMA_SUPPORTED 3599 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3600 png_uint_32 length)) PNG_PRIVATE; 3601 #endif 3602 3603 #ifdef PNG_READ_hIST_SUPPORTED 3604 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3605 png_uint_32 length)) PNG_PRIVATE; 3606 #endif 3607 3608 #ifdef PNG_READ_iCCP_SUPPORTED 3609 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3610 png_uint_32 length)); 3611 #endif /* PNG_READ_iCCP_SUPPORTED */ 3612 3613 #ifdef PNG_READ_iTXt_SUPPORTED 3614 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3615 png_uint_32 length)) PNG_PRIVATE; 3616 #endif 3617 3618 #ifdef PNG_READ_oFFs_SUPPORTED 3619 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3620 png_uint_32 length)) PNG_PRIVATE; 3621 #endif 3622 3623 #ifdef PNG_READ_pCAL_SUPPORTED 3624 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3625 png_uint_32 length)) PNG_PRIVATE; 3626 #endif 3627 3628 #ifdef PNG_READ_pHYs_SUPPORTED 3629 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3630 png_uint_32 length)) PNG_PRIVATE; 3631 #endif 3632 3633 #ifdef PNG_READ_sBIT_SUPPORTED 3634 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3635 png_uint_32 length)) PNG_PRIVATE; 3636 #endif 3637 3638 #ifdef PNG_READ_sCAL_SUPPORTED 3639 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3640 png_uint_32 length)) PNG_PRIVATE; 3641 #endif 3642 3643 #ifdef PNG_READ_sPLT_SUPPORTED 3644 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3645 png_uint_32 length)) PNG_PRIVATE; 3646 #endif /* PNG_READ_sPLT_SUPPORTED */ 3647 3648 #ifdef PNG_READ_sRGB_SUPPORTED 3649 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3650 png_uint_32 length)) PNG_PRIVATE; 3651 #endif 3652 3653 #ifdef PNG_READ_tEXt_SUPPORTED 3654 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3655 png_uint_32 length)) PNG_PRIVATE; 3656 #endif 3657 3658 #ifdef PNG_READ_tIME_SUPPORTED 3659 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3660 png_uint_32 length)) PNG_PRIVATE; 3661 #endif 3662 3663 #ifdef PNG_READ_tRNS_SUPPORTED 3664 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3665 png_uint_32 length)) PNG_PRIVATE; 3666 #endif 3667 3668 #ifdef PNG_READ_zTXt_SUPPORTED 3669 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3670 png_uint_32 length)) PNG_PRIVATE; 3671 #endif 3672 3673 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3674 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3675 3676 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3677 png_bytep chunk_name)) PNG_PRIVATE; 3678 3679 /* Handle the transformations for reading and writing */ 3680 PNG_EXTERN void png_do_read_transformations 3681 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3682 PNG_EXTERN void png_do_write_transformations 3683 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3684 3685 PNG_EXTERN void png_init_read_transformations 3686 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3687 3688 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3689 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3690 png_infop info_ptr)) PNG_PRIVATE; 3691 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3692 png_infop info_ptr)) PNG_PRIVATE; 3693 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3694 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3695 png_uint_32 length)) PNG_PRIVATE; 3696 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3697 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3698 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3699 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3700 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3701 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3702 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3703 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3704 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3705 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3706 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3707 png_infop info_ptr)) PNG_PRIVATE; 3708 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3709 png_infop info_ptr)) PNG_PRIVATE; 3710 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3711 png_bytep row)) PNG_PRIVATE; 3712 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3713 png_infop info_ptr)) PNG_PRIVATE; 3714 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3715 png_infop info_ptr)) PNG_PRIVATE; 3716 PNG_EXTERN void png_read_push_finish_row 3717 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3718 #ifdef PNG_READ_tEXt_SUPPORTED 3719 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3720 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3721 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3722 png_infop info_ptr)) PNG_PRIVATE; 3723 #endif 3724 #ifdef PNG_READ_zTXt_SUPPORTED 3725 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3726 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3727 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3728 png_infop info_ptr)) PNG_PRIVATE; 3729 #endif 3730 #ifdef PNG_READ_iTXt_SUPPORTED 3731 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3732 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3733 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3734 png_infop info_ptr)) PNG_PRIVATE; 3735 #endif 3736 3737 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3738 3739 #ifdef PNG_MNG_FEATURES_SUPPORTED 3740 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3741 png_bytep row)) PNG_PRIVATE; 3742 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3743 png_bytep row)) PNG_PRIVATE; 3744 #endif 3745 3746 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3747 #ifdef PNG_MMX_CODE_SUPPORTED 3748 /* png.c */ /* PRIVATE */ 3749 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3750 #endif 3751 #endif 3752 3753 3754 /* The following six functions will be exported in libpng-1.4.0. */ 3755 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3756 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3757 png_infop info_ptr)); 3758 3759 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3760 png_infop info_ptr)); 3761 3762 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3763 png_infop info_ptr)); 3764 3765 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3766 png_infop info_ptr)); 3767 3768 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3769 png_infop info_ptr)); 3770 3771 #ifdef PNG_pHYs_SUPPORTED 3772 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3773 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3774 #endif /* PNG_pHYs_SUPPORTED */ 3775 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3776 3777 /* Read the chunk header (length + type name) */ 3778 PNG_EXTERN png_uint_32 png_read_chunk_header 3779 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3780 3781 /* Added at libpng version 1.2.34 */ 3782 #ifdef PNG_cHRM_SUPPORTED 3783 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3784 png_fixed_point int_white_x, png_fixed_point int_white_y, 3785 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3786 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3787 png_fixed_point int_blue_y)) PNG_PRIVATE; 3788 #endif 3789 3790 #ifdef PNG_cHRM_SUPPORTED 3791 #ifdef PNG_CHECK_cHRM_SUPPORTED 3792 /* Added at libpng version 1.2.34 */ 3793 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3794 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3795 #endif 3796 #endif 3797 3798 /* Added at libpng version 1.2.41 */ 3799 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3800 png_uint_32 width, png_uint_32 height, int bit_depth, 3801 int color_type, int interlace_type, int compression_type, 3802 int filter_type)) PNG_PRIVATE; 3803 3804 /* Added at libpng version 1.2.41 */ 3805 PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3806 png_uint_32 size)); 3807 3808 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3809 3810 #endif /* PNG_INTERNAL */ 3811 3812 #ifdef __cplusplus 3813 } 3814 #endif 3815 3816 #endif /* PNG_VERSION_INFO_ONLY */ 3817 /* Do not put anything past this line */ 3818 #endif /* PNG_H */ 3819