dbf-halloween2015

annotate libs/libpng/png.h @ 1:c3f5c32cb210

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barfed all the libraries in the source tree to make porting easier
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 01 Nov 2015 00:36:56 +0200
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rev   line source
nuclear@1 1 /* png.h - header file for PNG reference library
nuclear@1 2 *
nuclear@1 3 * libpng version 1.2.33 - October 31, 2008
nuclear@1 4 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@1 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@1 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@1 7 *
nuclear@1 8 * Authors and maintainers:
nuclear@1 9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
nuclear@1 10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
nuclear@1 11 * libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn
nuclear@1 12 * See also "Contributing Authors", below.
nuclear@1 13 *
nuclear@1 14 * Note about libpng version numbers:
nuclear@1 15 *
nuclear@1 16 * Due to various miscommunications, unforeseen code incompatibilities
nuclear@1 17 * and occasional factors outside the authors' control, version numbering
nuclear@1 18 * on the library has not always been consistent and straightforward.
nuclear@1 19 * The following table summarizes matters since version 0.89c, which was
nuclear@1 20 * the first widely used release:
nuclear@1 21 *
nuclear@1 22 * source png.h png.h shared-lib
nuclear@1 23 * version string int version
nuclear@1 24 * ------- ------ ----- ----------
nuclear@1 25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
nuclear@1 26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
nuclear@1 27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
nuclear@1 28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
nuclear@1 29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
nuclear@1 30 * 0.97c 0.97 97 2.0.97
nuclear@1 31 * 0.98 0.98 98 2.0.98
nuclear@1 32 * 0.99 0.99 98 2.0.99
nuclear@1 33 * 0.99a-m 0.99 99 2.0.99
nuclear@1 34 * 1.00 1.00 100 2.1.0 [100 should be 10000]
nuclear@1 35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
nuclear@1 36 * 1.0.1 png.h string is 10001 2.1.0
nuclear@1 37 * 1.0.1a-e identical to the 10002 from here on, the shared library
nuclear@1 38 * 1.0.2 source version) 10002 is 2.V where V is the source code
nuclear@1 39 * 1.0.2a-b 10003 version, except as noted.
nuclear@1 40 * 1.0.3 10003
nuclear@1 41 * 1.0.3a-d 10004
nuclear@1 42 * 1.0.4 10004
nuclear@1 43 * 1.0.4a-f 10005
nuclear@1 44 * 1.0.5 (+ 2 patches) 10005
nuclear@1 45 * 1.0.5a-d 10006
nuclear@1 46 * 1.0.5e-r 10100 (not source compatible)
nuclear@1 47 * 1.0.5s-v 10006 (not binary compatible)
nuclear@1 48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
nuclear@1 49 * 1.0.6d-f 10007 (still binary incompatible)
nuclear@1 50 * 1.0.6g 10007
nuclear@1 51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
nuclear@1 52 * 1.0.6i 10007 10.6i
nuclear@1 53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
nuclear@1 54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
nuclear@1 55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
nuclear@1 56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
nuclear@1 57 * 1.0.7 1 10007 (still compatible)
nuclear@1 58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
nuclear@1 59 * 1.0.8rc1 1 10008 2.1.0.8rc1
nuclear@1 60 * 1.0.8 1 10008 2.1.0.8
nuclear@1 61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
nuclear@1 62 * 1.0.9rc1 1 10009 2.1.0.9rc1
nuclear@1 63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
nuclear@1 64 * 1.0.9rc2 1 10009 2.1.0.9rc2
nuclear@1 65 * 1.0.9 1 10009 2.1.0.9
nuclear@1 66 * 1.0.10beta1 1 10010 2.1.0.10beta1
nuclear@1 67 * 1.0.10rc1 1 10010 2.1.0.10rc1
nuclear@1 68 * 1.0.10 1 10010 2.1.0.10
nuclear@1 69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
nuclear@1 70 * 1.0.11rc1 1 10011 2.1.0.11rc1
nuclear@1 71 * 1.0.11 1 10011 2.1.0.11
nuclear@1 72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
nuclear@1 73 * 1.0.12rc1 2 10012 2.1.0.12rc1
nuclear@1 74 * 1.0.12 2 10012 2.1.0.12
nuclear@1 75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
nuclear@1 76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
nuclear@1 77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
nuclear@1 78 * 1.2.0rc1 3 10200 3.1.2.0rc1
nuclear@1 79 * 1.2.0 3 10200 3.1.2.0
nuclear@1 80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
nuclear@1 81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
nuclear@1 82 * 1.2.1 3 10201 3.1.2.1
nuclear@1 83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
nuclear@1 84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
nuclear@1 85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
nuclear@1 86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
nuclear@1 87 * 1.0.13 10 10013 10.so.0.1.0.13
nuclear@1 88 * 1.2.2 12 10202 12.so.0.1.2.2
nuclear@1 89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
nuclear@1 90 * 1.2.3 12 10203 12.so.0.1.2.3
nuclear@1 91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
nuclear@1 92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
nuclear@1 93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
nuclear@1 94 * 1.0.14 10 10014 10.so.0.1.0.14
nuclear@1 95 * 1.2.4 13 10204 12.so.0.1.2.4
nuclear@1 96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
nuclear@1 97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
nuclear@1 98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
nuclear@1 99 * 1.0.15 10 10015 10.so.0.1.0.15
nuclear@1 100 * 1.2.5 13 10205 12.so.0.1.2.5
nuclear@1 101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
nuclear@1 102 * 1.0.16 10 10016 10.so.0.1.0.16
nuclear@1 103 * 1.2.6 13 10206 12.so.0.1.2.6
nuclear@1 104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
nuclear@1 105 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
nuclear@1 106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
nuclear@1 107 * 1.0.17 10 10017 10.so.0.1.0.17
nuclear@1 108 * 1.2.7 13 10207 12.so.0.1.2.7
nuclear@1 109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
nuclear@1 110 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
nuclear@1 111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
nuclear@1 112 * 1.0.18 10 10018 10.so.0.1.0.18
nuclear@1 113 * 1.2.8 13 10208 12.so.0.1.2.8
nuclear@1 114 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
nuclear@1 115 * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
nuclear@1 116 * 1.2.9rc1 13 10209 12.so.0.9[.0]
nuclear@1 117 * 1.2.9 13 10209 12.so.0.9[.0]
nuclear@1 118 * 1.2.10beta1-8 13 10210 12.so.0.10[.0]
nuclear@1 119 * 1.2.10rc1-3 13 10210 12.so.0.10[.0]
nuclear@1 120 * 1.2.10 13 10210 12.so.0.10[.0]
nuclear@1 121 * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
nuclear@1 122 * 1.0.19rc1-5 10 10019 10.so.0.19[.0]
nuclear@1 123 * 1.2.11rc1-5 13 10211 12.so.0.11[.0]
nuclear@1 124 * 1.0.19 10 10019 10.so.0.19[.0]
nuclear@1 125 * 1.2.11 13 10211 12.so.0.11[.0]
nuclear@1 126 * 1.0.20 10 10020 10.so.0.20[.0]
nuclear@1 127 * 1.2.12 13 10212 12.so.0.12[.0]
nuclear@1 128 * 1.2.13beta1 13 10213 12.so.0.13[.0]
nuclear@1 129 * 1.0.21 10 10021 10.so.0.21[.0]
nuclear@1 130 * 1.2.13 13 10213 12.so.0.13[.0]
nuclear@1 131 * 1.2.14beta1-2 13 10214 12.so.0.14[.0]
nuclear@1 132 * 1.0.22rc1 10 10022 10.so.0.22[.0]
nuclear@1 133 * 1.2.14rc1 13 10214 12.so.0.14[.0]
nuclear@1 134 * 1.0.22 10 10022 10.so.0.22[.0]
nuclear@1 135 * 1.2.14 13 10214 12.so.0.14[.0]
nuclear@1 136 * 1.2.15beta1-6 13 10215 12.so.0.15[.0]
nuclear@1 137 * 1.0.23rc1-5 10 10023 10.so.0.23[.0]
nuclear@1 138 * 1.2.15rc1-5 13 10215 12.so.0.15[.0]
nuclear@1 139 * 1.0.23 10 10023 10.so.0.23[.0]
nuclear@1 140 * 1.2.15 13 10215 12.so.0.15[.0]
nuclear@1 141 * 1.2.16beta1-2 13 10216 12.so.0.16[.0]
nuclear@1 142 * 1.2.16rc1 13 10216 12.so.0.16[.0]
nuclear@1 143 * 1.0.24 10 10024 10.so.0.24[.0]
nuclear@1 144 * 1.2.16 13 10216 12.so.0.16[.0]
nuclear@1 145 * 1.2.17beta1-2 13 10217 12.so.0.17[.0]
nuclear@1 146 * 1.0.25rc1 10 10025 10.so.0.25[.0]
nuclear@1 147 * 1.2.17rc1-3 13 10217 12.so.0.17[.0]
nuclear@1 148 * 1.0.25 10 10025 10.so.0.25[.0]
nuclear@1 149 * 1.2.17 13 10217 12.so.0.17[.0]
nuclear@1 150 * 1.0.26 10 10026 10.so.0.26[.0]
nuclear@1 151 * 1.2.18 13 10218 12.so.0.18[.0]
nuclear@1 152 * 1.2.19beta1-31 13 10219 12.so.0.19[.0]
nuclear@1 153 * 1.0.27rc1-6 10 10027 10.so.0.27[.0]
nuclear@1 154 * 1.2.19rc1-6 13 10219 12.so.0.19[.0]
nuclear@1 155 * 1.0.27 10 10027 10.so.0.27[.0]
nuclear@1 156 * 1.2.19 13 10219 12.so.0.19[.0]
nuclear@1 157 * 1.2.20beta01-04 13 10220 12.so.0.20[.0]
nuclear@1 158 * 1.0.28rc1-6 10 10028 10.so.0.28[.0]
nuclear@1 159 * 1.2.20rc1-6 13 10220 12.so.0.20[.0]
nuclear@1 160 * 1.0.28 10 10028 10.so.0.28[.0]
nuclear@1 161 * 1.2.20 13 10220 12.so.0.20[.0]
nuclear@1 162 * 1.2.21beta1-2 13 10221 12.so.0.21[.0]
nuclear@1 163 * 1.2.21rc1-3 13 10221 12.so.0.21[.0]
nuclear@1 164 * 1.0.29 10 10029 10.so.0.29[.0]
nuclear@1 165 * 1.2.21 13 10221 12.so.0.21[.0]
nuclear@1 166 * 1.2.22beta1-4 13 10222 12.so.0.22[.0]
nuclear@1 167 * 1.0.30rc1 10 10030 10.so.0.30[.0]
nuclear@1 168 * 1.2.22rc1 13 10222 12.so.0.22[.0]
nuclear@1 169 * 1.0.30 10 10030 10.so.0.30[.0]
nuclear@1 170 * 1.2.22 13 10222 12.so.0.22[.0]
nuclear@1 171 * 1.2.23beta01-05 13 10223 12.so.0.23[.0]
nuclear@1 172 * 1.2.23rc01 13 10223 12.so.0.23[.0]
nuclear@1 173 * 1.2.23 13 10223 12.so.0.23[.0]
nuclear@1 174 * 1.2.24beta01-02 13 10224 12.so.0.24[.0]
nuclear@1 175 * 1.2.24rc01 13 10224 12.so.0.24[.0]
nuclear@1 176 * 1.2.24 13 10224 12.so.0.24[.0]
nuclear@1 177 * 1.2.25beta01-06 13 10225 12.so.0.25[.0]
nuclear@1 178 * 1.2.25rc01-02 13 10225 12.so.0.25[.0]
nuclear@1 179 * 1.0.31 10 10031 10.so.0.31[.0]
nuclear@1 180 * 1.2.25 13 10225 12.so.0.25[.0]
nuclear@1 181 * 1.2.26beta01-06 13 10226 12.so.0.26[.0]
nuclear@1 182 * 1.2.26rc01 13 10226 12.so.0.26[.0]
nuclear@1 183 * 1.2.26 13 10226 12.so.0.26[.0]
nuclear@1 184 * 1.0.32 10 10032 10.so.0.32[.0]
nuclear@1 185 * 1.2.27beta01-06 13 10227 12.so.0.27[.0]
nuclear@1 186 * 1.2.27rc01 13 10227 12.so.0.27[.0]
nuclear@1 187 * 1.0.33 10 10033 10.so.0.33[.0]
nuclear@1 188 * 1.2.27 13 10227 12.so.0.27[.0]
nuclear@1 189 * 1.0.34 10 10034 10.so.0.34[.0]
nuclear@1 190 * 1.2.28 13 10228 12.so.0.28[.0]
nuclear@1 191 * 1.2.29beta01-03 13 10229 12.so.0.29[.0]
nuclear@1 192 * 1.2.29rc01 13 10229 12.so.0.29[.0]
nuclear@1 193 * 1.0.35 10 10035 10.so.0.35[.0]
nuclear@1 194 * 1.2.29 13 10229 12.so.0.29[.0]
nuclear@1 195 * 1.0.37 10 10037 10.so.0.37[.0]
nuclear@1 196 * 1.2.30beta01-04 13 10230 12.so.0.30[.0]
nuclear@1 197 * 1.0.38rc01-08 10 10038 10.so.0.38[.0]
nuclear@1 198 * 1.2.30rc01-08 13 10230 12.so.0.30[.0]
nuclear@1 199 * 1.0.38 10 10038 10.so.0.38[.0]
nuclear@1 200 * 1.2.30 13 10230 12.so.0.30[.0]
nuclear@1 201 * 1.0.39rc01-03 10 10039 10.so.0.39[.0]
nuclear@1 202 * 1.2.31rc01-03 13 10231 12.so.0.31[.0]
nuclear@1 203 * 1.0.39 10 10039 10.so.0.39[.0]
nuclear@1 204 * 1.2.31 13 10231 12.so.0.31[.0]
nuclear@1 205 * 1.2.32beta01-02 13 10232 12.so.0.32[.0]
nuclear@1 206 * 1.0.40rc01 10 10040 10.so.0.40[.0]
nuclear@1 207 * 1.2.32rc01 13 10232 12.so.0.32[.0]
nuclear@1 208 * 1.0.40 10 10040 10.so.0.40[.0]
nuclear@1 209 * 1.2.32 13 10232 12.so.0.32[.0]
nuclear@1 210 * 1.2.33beta01-02 13 10233 12.so.0.33[.0]
nuclear@1 211 * 1.2.33rc01-02 13 10233 12.so.0.33[.0]
nuclear@1 212 * 1.0.41rc01 10 10041 10.so.0.41[.0]
nuclear@1 213 * 1.2.33 13 10233 12.so.0.33[.0]
nuclear@1 214 * 1.0.41 10 10041 10.so.0.41[.0]
nuclear@1 215 *
nuclear@1 216 * Henceforth the source version will match the shared-library major
nuclear@1 217 * and minor numbers; the shared-library major version number will be
nuclear@1 218 * used for changes in backward compatibility, as it is intended. The
nuclear@1 219 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
nuclear@1 220 * for applications, is an unsigned integer of the form xyyzz corresponding
nuclear@1 221 * to the source version x.y.z (leading zeros in y and z). Beta versions
nuclear@1 222 * were given the previous public release number plus a letter, until
nuclear@1 223 * version 1.0.6j; from then on they were given the upcoming public
nuclear@1 224 * release number plus "betaNN" or "rcNN".
nuclear@1 225 *
nuclear@1 226 * Binary incompatibility exists only when applications make direct access
nuclear@1 227 * to the info_ptr or png_ptr members through png.h, and the compiled
nuclear@1 228 * application is loaded with a different version of the library.
nuclear@1 229 *
nuclear@1 230 * DLLNUM will change each time there are forward or backward changes
nuclear@1 231 * in binary compatibility (e.g., when a new feature is added).
nuclear@1 232 *
nuclear@1 233 * See libpng.txt or libpng.3 for more information. The PNG specification
nuclear@1 234 * is available as a W3C Recommendation and as an ISO Specification,
nuclear@1 235 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
nuclear@1 236 */
nuclear@1 237
nuclear@1 238 /*
nuclear@1 239 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
nuclear@1 240 *
nuclear@1 241 * If you modify libpng you may insert additional notices immediately following
nuclear@1 242 * this sentence.
nuclear@1 243 *
nuclear@1 244 * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are
nuclear@1 245 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
nuclear@1 246 * distributed according to the same disclaimer and license as libpng-1.2.5
nuclear@1 247 * with the following individual added to the list of Contributing Authors:
nuclear@1 248 *
nuclear@1 249 * Cosmin Truta
nuclear@1 250 *
nuclear@1 251 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
nuclear@1 252 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
nuclear@1 253 * distributed according to the same disclaimer and license as libpng-1.0.6
nuclear@1 254 * with the following individuals added to the list of Contributing Authors:
nuclear@1 255 *
nuclear@1 256 * Simon-Pierre Cadieux
nuclear@1 257 * Eric S. Raymond
nuclear@1 258 * Gilles Vollant
nuclear@1 259 *
nuclear@1 260 * and with the following additions to the disclaimer:
nuclear@1 261 *
nuclear@1 262 * There is no warranty against interference with your enjoyment of the
nuclear@1 263 * library or against infringement. There is no warranty that our
nuclear@1 264 * efforts or the library will fulfill any of your particular purposes
nuclear@1 265 * or needs. This library is provided with all faults, and the entire
nuclear@1 266 * risk of satisfactory quality, performance, accuracy, and effort is with
nuclear@1 267 * the user.
nuclear@1 268 *
nuclear@1 269 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
nuclear@1 270 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
nuclear@1 271 * distributed according to the same disclaimer and license as libpng-0.96,
nuclear@1 272 * with the following individuals added to the list of Contributing Authors:
nuclear@1 273 *
nuclear@1 274 * Tom Lane
nuclear@1 275 * Glenn Randers-Pehrson
nuclear@1 276 * Willem van Schaik
nuclear@1 277 *
nuclear@1 278 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
nuclear@1 279 * Copyright (c) 1996, 1997 Andreas Dilger
nuclear@1 280 * Distributed according to the same disclaimer and license as libpng-0.88,
nuclear@1 281 * with the following individuals added to the list of Contributing Authors:
nuclear@1 282 *
nuclear@1 283 * John Bowler
nuclear@1 284 * Kevin Bracey
nuclear@1 285 * Sam Bushell
nuclear@1 286 * Magnus Holmgren
nuclear@1 287 * Greg Roelofs
nuclear@1 288 * Tom Tanner
nuclear@1 289 *
nuclear@1 290 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
nuclear@1 291 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
nuclear@1 292 *
nuclear@1 293 * For the purposes of this copyright and license, "Contributing Authors"
nuclear@1 294 * is defined as the following set of individuals:
nuclear@1 295 *
nuclear@1 296 * Andreas Dilger
nuclear@1 297 * Dave Martindale
nuclear@1 298 * Guy Eric Schalnat
nuclear@1 299 * Paul Schmidt
nuclear@1 300 * Tim Wegner
nuclear@1 301 *
nuclear@1 302 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
nuclear@1 303 * and Group 42, Inc. disclaim all warranties, expressed or implied,
nuclear@1 304 * including, without limitation, the warranties of merchantability and of
nuclear@1 305 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
nuclear@1 306 * assume no liability for direct, indirect, incidental, special, exemplary,
nuclear@1 307 * or consequential damages, which may result from the use of the PNG
nuclear@1 308 * Reference Library, even if advised of the possibility of such damage.
nuclear@1 309 *
nuclear@1 310 * Permission is hereby granted to use, copy, modify, and distribute this
nuclear@1 311 * source code, or portions hereof, for any purpose, without fee, subject
nuclear@1 312 * to the following restrictions:
nuclear@1 313 *
nuclear@1 314 * 1. The origin of this source code must not be misrepresented.
nuclear@1 315 *
nuclear@1 316 * 2. Altered versions must be plainly marked as such and
nuclear@1 317 * must not be misrepresented as being the original source.
nuclear@1 318 *
nuclear@1 319 * 3. This Copyright notice may not be removed or altered from
nuclear@1 320 * any source or altered source distribution.
nuclear@1 321 *
nuclear@1 322 * The Contributing Authors and Group 42, Inc. specifically permit, without
nuclear@1 323 * fee, and encourage the use of this source code as a component to
nuclear@1 324 * supporting the PNG file format in commercial products. If you use this
nuclear@1 325 * source code in a product, acknowledgment is not required but would be
nuclear@1 326 * appreciated.
nuclear@1 327 */
nuclear@1 328
nuclear@1 329 /*
nuclear@1 330 * A "png_get_copyright" function is available, for convenient use in "about"
nuclear@1 331 * boxes and the like:
nuclear@1 332 *
nuclear@1 333 * printf("%s",png_get_copyright(NULL));
nuclear@1 334 *
nuclear@1 335 * Also, the PNG logo (in PNG format, of course) is supplied in the
nuclear@1 336 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
nuclear@1 337 */
nuclear@1 338
nuclear@1 339 /*
nuclear@1 340 * Libpng is OSI Certified Open Source Software. OSI Certified is a
nuclear@1 341 * certification mark of the Open Source Initiative.
nuclear@1 342 */
nuclear@1 343
nuclear@1 344 /*
nuclear@1 345 * The contributing authors would like to thank all those who helped
nuclear@1 346 * with testing, bug fixes, and patience. This wouldn't have been
nuclear@1 347 * possible without all of you.
nuclear@1 348 *
nuclear@1 349 * Thanks to Frank J. T. Wojcik for helping with the documentation.
nuclear@1 350 */
nuclear@1 351
nuclear@1 352 /*
nuclear@1 353 * Y2K compliance in libpng:
nuclear@1 354 * =========================
nuclear@1 355 *
nuclear@1 356 * October 31, 2008
nuclear@1 357 *
nuclear@1 358 * Since the PNG Development group is an ad-hoc body, we can't make
nuclear@1 359 * an official declaration.
nuclear@1 360 *
nuclear@1 361 * This is your unofficial assurance that libpng from version 0.71 and
nuclear@1 362 * upward through 1.2.33 are Y2K compliant. It is my belief that earlier
nuclear@1 363 * versions were also Y2K compliant.
nuclear@1 364 *
nuclear@1 365 * Libpng only has three year fields. One is a 2-byte unsigned integer
nuclear@1 366 * that will hold years up to 65535. The other two hold the date in text
nuclear@1 367 * format, and will hold years up to 9999.
nuclear@1 368 *
nuclear@1 369 * The integer is
nuclear@1 370 * "png_uint_16 year" in png_time_struct.
nuclear@1 371 *
nuclear@1 372 * The strings are
nuclear@1 373 * "png_charp time_buffer" in png_struct and
nuclear@1 374 * "near_time_buffer", which is a local character string in png.c.
nuclear@1 375 *
nuclear@1 376 * There are seven time-related functions:
nuclear@1 377 * png.c: png_convert_to_rfc_1123() in png.c
nuclear@1 378 * (formerly png_convert_to_rfc_1152() in error)
nuclear@1 379 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
nuclear@1 380 * png_convert_from_time_t() in pngwrite.c
nuclear@1 381 * png_get_tIME() in pngget.c
nuclear@1 382 * png_handle_tIME() in pngrutil.c, called in pngread.c
nuclear@1 383 * png_set_tIME() in pngset.c
nuclear@1 384 * png_write_tIME() in pngwutil.c, called in pngwrite.c
nuclear@1 385 *
nuclear@1 386 * All handle dates properly in a Y2K environment. The
nuclear@1 387 * png_convert_from_time_t() function calls gmtime() to convert from system
nuclear@1 388 * clock time, which returns (year - 1900), which we properly convert to
nuclear@1 389 * the full 4-digit year. There is a possibility that applications using
nuclear@1 390 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
nuclear@1 391 * function, or that they are incorrectly passing only a 2-digit year
nuclear@1 392 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
nuclear@1 393 * but this is not under our control. The libpng documentation has always
nuclear@1 394 * stated that it works with 4-digit years, and the APIs have been
nuclear@1 395 * documented as such.
nuclear@1 396 *
nuclear@1 397 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
nuclear@1 398 * integer to hold the year, and can hold years as large as 65535.
nuclear@1 399 *
nuclear@1 400 * zlib, upon which libpng depends, is also Y2K compliant. It contains
nuclear@1 401 * no date-related code.
nuclear@1 402 *
nuclear@1 403 * Glenn Randers-Pehrson
nuclear@1 404 * libpng maintainer
nuclear@1 405 * PNG Development Group
nuclear@1 406 */
nuclear@1 407
nuclear@1 408 #ifndef PNG_H
nuclear@1 409 #define PNG_H
nuclear@1 410
nuclear@1 411 /* This is not the place to learn how to use libpng. The file libpng.txt
nuclear@1 412 * describes how to use libpng, and the file example.c summarizes it
nuclear@1 413 * with some code on which to build. This file is useful for looking
nuclear@1 414 * at the actual function definitions and structure components.
nuclear@1 415 */
nuclear@1 416
nuclear@1 417 /* Version information for png.h - this should match the version in png.c */
nuclear@1 418 #define PNG_LIBPNG_VER_STRING "1.2.33"
nuclear@1 419 #define PNG_HEADER_VERSION_STRING \
nuclear@1 420 " libpng version 1.2.33 - October 31, 2008\n"
nuclear@1 421
nuclear@1 422 #define PNG_LIBPNG_VER_SONUM 0
nuclear@1 423 #define PNG_LIBPNG_VER_DLLNUM 13
nuclear@1 424
nuclear@1 425 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
nuclear@1 426 #define PNG_LIBPNG_VER_MAJOR 1
nuclear@1 427 #define PNG_LIBPNG_VER_MINOR 2
nuclear@1 428 #define PNG_LIBPNG_VER_RELEASE 33
nuclear@1 429 /* This should match the numeric part of the final component of
nuclear@1 430 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
nuclear@1 431
nuclear@1 432 #define PNG_LIBPNG_VER_BUILD 0
nuclear@1 433
nuclear@1 434 /* Release Status */
nuclear@1 435 #define PNG_LIBPNG_BUILD_ALPHA 1
nuclear@1 436 #define PNG_LIBPNG_BUILD_BETA 2
nuclear@1 437 #define PNG_LIBPNG_BUILD_RC 3
nuclear@1 438 #define PNG_LIBPNG_BUILD_STABLE 4
nuclear@1 439 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
nuclear@1 440
nuclear@1 441 /* Release-Specific Flags */
nuclear@1 442 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
nuclear@1 443 PNG_LIBPNG_BUILD_STABLE only */
nuclear@1 444 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
nuclear@1 445 PNG_LIBPNG_BUILD_SPECIAL */
nuclear@1 446 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
nuclear@1 447 PNG_LIBPNG_BUILD_PRIVATE */
nuclear@1 448
nuclear@1 449 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
nuclear@1 450
nuclear@1 451 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
nuclear@1 452 * We must not include leading zeros.
nuclear@1 453 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
nuclear@1 454 * version 1.0.0 was mis-numbered 100 instead of 10000). From
nuclear@1 455 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
nuclear@1 456 #define PNG_LIBPNG_VER 10233 /* 1.2.33 */
nuclear@1 457
nuclear@1 458 #ifndef PNG_VERSION_INFO_ONLY
nuclear@1 459 /* include the compression library's header */
nuclear@1 460 #include "zlib.h"
nuclear@1 461 #endif
nuclear@1 462
nuclear@1 463 /* include all user configurable info, including optional assembler routines */
nuclear@1 464 #include "pngconf.h"
nuclear@1 465
nuclear@1 466 /*
nuclear@1 467 * Added at libpng-1.2.8 */
nuclear@1 468 /* Ref MSDN: Private as priority over Special
nuclear@1 469 * VS_FF_PRIVATEBUILD File *was not* built using standard release
nuclear@1 470 * procedures. If this value is given, the StringFileInfo block must
nuclear@1 471 * contain a PrivateBuild string.
nuclear@1 472 *
nuclear@1 473 * VS_FF_SPECIALBUILD File *was* built by the original company using
nuclear@1 474 * standard release procedures but is a variation of the standard
nuclear@1 475 * file of the same version number. If this value is given, the
nuclear@1 476 * StringFileInfo block must contain a SpecialBuild string.
nuclear@1 477 */
nuclear@1 478
nuclear@1 479 #if defined(PNG_USER_PRIVATEBUILD)
nuclear@1 480 # define PNG_LIBPNG_BUILD_TYPE \
nuclear@1 481 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
nuclear@1 482 #else
nuclear@1 483 # if defined(PNG_LIBPNG_SPECIALBUILD)
nuclear@1 484 # define PNG_LIBPNG_BUILD_TYPE \
nuclear@1 485 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
nuclear@1 486 # else
nuclear@1 487 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
nuclear@1 488 # endif
nuclear@1 489 #endif
nuclear@1 490
nuclear@1 491 #ifndef PNG_VERSION_INFO_ONLY
nuclear@1 492
nuclear@1 493 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
nuclear@1 494 #ifdef __cplusplus
nuclear@1 495 extern "C" {
nuclear@1 496 #endif /* __cplusplus */
nuclear@1 497
nuclear@1 498 /* This file is arranged in several sections. The first section contains
nuclear@1 499 * structure and type definitions. The second section contains the external
nuclear@1 500 * library functions, while the third has the internal library functions,
nuclear@1 501 * which applications aren't expected to use directly.
nuclear@1 502 */
nuclear@1 503
nuclear@1 504 #ifndef PNG_NO_TYPECAST_NULL
nuclear@1 505 #define int_p_NULL (int *)NULL
nuclear@1 506 #define png_bytep_NULL (png_bytep)NULL
nuclear@1 507 #define png_bytepp_NULL (png_bytepp)NULL
nuclear@1 508 #define png_doublep_NULL (png_doublep)NULL
nuclear@1 509 #define png_error_ptr_NULL (png_error_ptr)NULL
nuclear@1 510 #define png_flush_ptr_NULL (png_flush_ptr)NULL
nuclear@1 511 #define png_free_ptr_NULL (png_free_ptr)NULL
nuclear@1 512 #define png_infopp_NULL (png_infopp)NULL
nuclear@1 513 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
nuclear@1 514 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
nuclear@1 515 #define png_rw_ptr_NULL (png_rw_ptr)NULL
nuclear@1 516 #define png_structp_NULL (png_structp)NULL
nuclear@1 517 #define png_uint_16p_NULL (png_uint_16p)NULL
nuclear@1 518 #define png_voidp_NULL (png_voidp)NULL
nuclear@1 519 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
nuclear@1 520 #else
nuclear@1 521 #define int_p_NULL NULL
nuclear@1 522 #define png_bytep_NULL NULL
nuclear@1 523 #define png_bytepp_NULL NULL
nuclear@1 524 #define png_doublep_NULL NULL
nuclear@1 525 #define png_error_ptr_NULL NULL
nuclear@1 526 #define png_flush_ptr_NULL NULL
nuclear@1 527 #define png_free_ptr_NULL NULL
nuclear@1 528 #define png_infopp_NULL NULL
nuclear@1 529 #define png_malloc_ptr_NULL NULL
nuclear@1 530 #define png_read_status_ptr_NULL NULL
nuclear@1 531 #define png_rw_ptr_NULL NULL
nuclear@1 532 #define png_structp_NULL NULL
nuclear@1 533 #define png_uint_16p_NULL NULL
nuclear@1 534 #define png_voidp_NULL NULL
nuclear@1 535 #define png_write_status_ptr_NULL NULL
nuclear@1 536 #endif
nuclear@1 537
nuclear@1 538 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@1 539 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@1 540 /* Version information for C files, stored in png.c. This had better match
nuclear@1 541 * the version above.
nuclear@1 542 */
nuclear@1 543 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@1 544 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
nuclear@1 545 /* need room for 99.99.99beta99z */
nuclear@1 546 #else
nuclear@1 547 #define png_libpng_ver png_get_header_ver(NULL)
nuclear@1 548 #endif
nuclear@1 549
nuclear@1 550 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@1 551 /* This was removed in version 1.0.5c */
nuclear@1 552 /* Structures to facilitate easy interlacing. See png.c for more details */
nuclear@1 553 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
nuclear@1 554 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
nuclear@1 555 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
nuclear@1 556 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
nuclear@1 557 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
nuclear@1 558 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
nuclear@1 559 /* This isn't currently used. If you need it, see png.c for more details.
nuclear@1 560 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
nuclear@1 561 */
nuclear@1 562 #endif
nuclear@1 563
nuclear@1 564 #endif /* PNG_NO_EXTERN */
nuclear@1 565
nuclear@1 566 /* Three color definitions. The order of the red, green, and blue, (and the
nuclear@1 567 * exact size) is not important, although the size of the fields need to
nuclear@1 568 * be png_byte or png_uint_16 (as defined below).
nuclear@1 569 */
nuclear@1 570 typedef struct png_color_struct
nuclear@1 571 {
nuclear@1 572 png_byte red;
nuclear@1 573 png_byte green;
nuclear@1 574 png_byte blue;
nuclear@1 575 } png_color;
nuclear@1 576 typedef png_color FAR * png_colorp;
nuclear@1 577 typedef png_color FAR * FAR * png_colorpp;
nuclear@1 578
nuclear@1 579 typedef struct png_color_16_struct
nuclear@1 580 {
nuclear@1 581 png_byte index; /* used for palette files */
nuclear@1 582 png_uint_16 red; /* for use in red green blue files */
nuclear@1 583 png_uint_16 green;
nuclear@1 584 png_uint_16 blue;
nuclear@1 585 png_uint_16 gray; /* for use in grayscale files */
nuclear@1 586 } png_color_16;
nuclear@1 587 typedef png_color_16 FAR * png_color_16p;
nuclear@1 588 typedef png_color_16 FAR * FAR * png_color_16pp;
nuclear@1 589
nuclear@1 590 typedef struct png_color_8_struct
nuclear@1 591 {
nuclear@1 592 png_byte red; /* for use in red green blue files */
nuclear@1 593 png_byte green;
nuclear@1 594 png_byte blue;
nuclear@1 595 png_byte gray; /* for use in grayscale files */
nuclear@1 596 png_byte alpha; /* for alpha channel files */
nuclear@1 597 } png_color_8;
nuclear@1 598 typedef png_color_8 FAR * png_color_8p;
nuclear@1 599 typedef png_color_8 FAR * FAR * png_color_8pp;
nuclear@1 600
nuclear@1 601 /*
nuclear@1 602 * The following two structures are used for the in-core representation
nuclear@1 603 * of sPLT chunks.
nuclear@1 604 */
nuclear@1 605 typedef struct png_sPLT_entry_struct
nuclear@1 606 {
nuclear@1 607 png_uint_16 red;
nuclear@1 608 png_uint_16 green;
nuclear@1 609 png_uint_16 blue;
nuclear@1 610 png_uint_16 alpha;
nuclear@1 611 png_uint_16 frequency;
nuclear@1 612 } png_sPLT_entry;
nuclear@1 613 typedef png_sPLT_entry FAR * png_sPLT_entryp;
nuclear@1 614 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
nuclear@1 615
nuclear@1 616 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
nuclear@1 617 * occupy the LSB of their respective members, and the MSB of each member
nuclear@1 618 * is zero-filled. The frequency member always occupies the full 16 bits.
nuclear@1 619 */
nuclear@1 620
nuclear@1 621 typedef struct png_sPLT_struct
nuclear@1 622 {
nuclear@1 623 png_charp name; /* palette name */
nuclear@1 624 png_byte depth; /* depth of palette samples */
nuclear@1 625 png_sPLT_entryp entries; /* palette entries */
nuclear@1 626 png_int_32 nentries; /* number of palette entries */
nuclear@1 627 } png_sPLT_t;
nuclear@1 628 typedef png_sPLT_t FAR * png_sPLT_tp;
nuclear@1 629 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
nuclear@1 630
nuclear@1 631 #ifdef PNG_TEXT_SUPPORTED
nuclear@1 632 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
nuclear@1 633 * and whether that contents is compressed or not. The "key" field
nuclear@1 634 * points to a regular zero-terminated C string. The "text", "lang", and
nuclear@1 635 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
nuclear@1 636 * However, the * structure returned by png_get_text() will always contain
nuclear@1 637 * regular zero-terminated C strings (possibly empty), never NULL pointers,
nuclear@1 638 * so they can be safely used in printf() and other string-handling functions.
nuclear@1 639 */
nuclear@1 640 typedef struct png_text_struct
nuclear@1 641 {
nuclear@1 642 int compression; /* compression value:
nuclear@1 643 -1: tEXt, none
nuclear@1 644 0: zTXt, deflate
nuclear@1 645 1: iTXt, none
nuclear@1 646 2: iTXt, deflate */
nuclear@1 647 png_charp key; /* keyword, 1-79 character description of "text" */
nuclear@1 648 png_charp text; /* comment, may be an empty string (ie "")
nuclear@1 649 or a NULL pointer */
nuclear@1 650 png_size_t text_length; /* length of the text string */
nuclear@1 651 #ifdef PNG_iTXt_SUPPORTED
nuclear@1 652 png_size_t itxt_length; /* length of the itxt string */
nuclear@1 653 png_charp lang; /* language code, 0-79 characters
nuclear@1 654 or a NULL pointer */
nuclear@1 655 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
nuclear@1 656 chars or a NULL pointer */
nuclear@1 657 #endif
nuclear@1 658 } png_text;
nuclear@1 659 typedef png_text FAR * png_textp;
nuclear@1 660 typedef png_text FAR * FAR * png_textpp;
nuclear@1 661 #endif
nuclear@1 662
nuclear@1 663 /* Supported compression types for text in PNG files (tEXt, and zTXt).
nuclear@1 664 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
nuclear@1 665 #define PNG_TEXT_COMPRESSION_NONE_WR -3
nuclear@1 666 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
nuclear@1 667 #define PNG_TEXT_COMPRESSION_NONE -1
nuclear@1 668 #define PNG_TEXT_COMPRESSION_zTXt 0
nuclear@1 669 #define PNG_ITXT_COMPRESSION_NONE 1
nuclear@1 670 #define PNG_ITXT_COMPRESSION_zTXt 2
nuclear@1 671 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
nuclear@1 672
nuclear@1 673 /* png_time is a way to hold the time in an machine independent way.
nuclear@1 674 * Two conversions are provided, both from time_t and struct tm. There
nuclear@1 675 * is no portable way to convert to either of these structures, as far
nuclear@1 676 * as I know. If you know of a portable way, send it to me. As a side
nuclear@1 677 * note - PNG has always been Year 2000 compliant!
nuclear@1 678 */
nuclear@1 679 typedef struct png_time_struct
nuclear@1 680 {
nuclear@1 681 png_uint_16 year; /* full year, as in, 1995 */
nuclear@1 682 png_byte month; /* month of year, 1 - 12 */
nuclear@1 683 png_byte day; /* day of month, 1 - 31 */
nuclear@1 684 png_byte hour; /* hour of day, 0 - 23 */
nuclear@1 685 png_byte minute; /* minute of hour, 0 - 59 */
nuclear@1 686 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
nuclear@1 687 } png_time;
nuclear@1 688 typedef png_time FAR * png_timep;
nuclear@1 689 typedef png_time FAR * FAR * png_timepp;
nuclear@1 690
nuclear@1 691 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 692 /* png_unknown_chunk is a structure to hold queued chunks for which there is
nuclear@1 693 * no specific support. The idea is that we can use this to queue
nuclear@1 694 * up private chunks for output even though the library doesn't actually
nuclear@1 695 * know about their semantics.
nuclear@1 696 */
nuclear@1 697 #define PNG_CHUNK_NAME_LENGTH 5
nuclear@1 698 typedef struct png_unknown_chunk_t
nuclear@1 699 {
nuclear@1 700 png_byte name[PNG_CHUNK_NAME_LENGTH];
nuclear@1 701 png_byte *data;
nuclear@1 702 png_size_t size;
nuclear@1 703
nuclear@1 704 /* libpng-using applications should NOT directly modify this byte. */
nuclear@1 705 png_byte location; /* mode of operation at read time */
nuclear@1 706 }
nuclear@1 707 png_unknown_chunk;
nuclear@1 708 typedef png_unknown_chunk FAR * png_unknown_chunkp;
nuclear@1 709 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
nuclear@1 710 #endif
nuclear@1 711
nuclear@1 712 /* png_info is a structure that holds the information in a PNG file so
nuclear@1 713 * that the application can find out the characteristics of the image.
nuclear@1 714 * If you are reading the file, this structure will tell you what is
nuclear@1 715 * in the PNG file. If you are writing the file, fill in the information
nuclear@1 716 * you want to put into the PNG file, then call png_write_info().
nuclear@1 717 * The names chosen should be very close to the PNG specification, so
nuclear@1 718 * consult that document for information about the meaning of each field.
nuclear@1 719 *
nuclear@1 720 * With libpng < 0.95, it was only possible to directly set and read the
nuclear@1 721 * the values in the png_info_struct, which meant that the contents and
nuclear@1 722 * order of the values had to remain fixed. With libpng 0.95 and later,
nuclear@1 723 * however, there are now functions that abstract the contents of
nuclear@1 724 * png_info_struct from the application, so this makes it easier to use
nuclear@1 725 * libpng with dynamic libraries, and even makes it possible to use
nuclear@1 726 * libraries that don't have all of the libpng ancillary chunk-handing
nuclear@1 727 * functionality.
nuclear@1 728 *
nuclear@1 729 * In any case, the order of the parameters in png_info_struct should NOT
nuclear@1 730 * be changed for as long as possible to keep compatibility with applications
nuclear@1 731 * that use the old direct-access method with png_info_struct.
nuclear@1 732 *
nuclear@1 733 * The following members may have allocated storage attached that should be
nuclear@1 734 * cleaned up before the structure is discarded: palette, trans, text,
nuclear@1 735 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
nuclear@1 736 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
nuclear@1 737 * are automatically freed when the info structure is deallocated, if they were
nuclear@1 738 * allocated internally by libpng. This behavior can be changed by means
nuclear@1 739 * of the png_data_freer() function.
nuclear@1 740 *
nuclear@1 741 * More allocation details: all the chunk-reading functions that
nuclear@1 742 * change these members go through the corresponding png_set_*
nuclear@1 743 * functions. A function to clear these members is available: see
nuclear@1 744 * png_free_data(). The png_set_* functions do not depend on being
nuclear@1 745 * able to point info structure members to any of the storage they are
nuclear@1 746 * passed (they make their own copies), EXCEPT that the png_set_text
nuclear@1 747 * functions use the same storage passed to them in the text_ptr or
nuclear@1 748 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
nuclear@1 749 * functions do not make their own copies.
nuclear@1 750 */
nuclear@1 751 typedef struct png_info_struct
nuclear@1 752 {
nuclear@1 753 /* the following are necessary for every PNG file */
nuclear@1 754 png_uint_32 width; /* width of image in pixels (from IHDR) */
nuclear@1 755 png_uint_32 height; /* height of image in pixels (from IHDR) */
nuclear@1 756 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
nuclear@1 757 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
nuclear@1 758 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
nuclear@1 759 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
nuclear@1 760 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
nuclear@1 761 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
nuclear@1 762 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
nuclear@1 763 /* The following three should have been named *_method not *_type */
nuclear@1 764 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
nuclear@1 765 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
nuclear@1 766 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@1 767
nuclear@1 768 /* The following is informational only on read, and not used on writes. */
nuclear@1 769 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
nuclear@1 770 png_byte pixel_depth; /* number of bits per pixel */
nuclear@1 771 png_byte spare_byte; /* to align the data, and for future use */
nuclear@1 772 png_byte signature[8]; /* magic bytes read by libpng from start of file */
nuclear@1 773
nuclear@1 774 /* The rest of the data is optional. If you are reading, check the
nuclear@1 775 * valid field to see if the information in these are valid. If you
nuclear@1 776 * are writing, set the valid field to those chunks you want written,
nuclear@1 777 * and initialize the appropriate fields below.
nuclear@1 778 */
nuclear@1 779
nuclear@1 780 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@1 781 /* The gAMA chunk describes the gamma characteristics of the system
nuclear@1 782 * on which the image was created, normally in the range [1.0, 2.5].
nuclear@1 783 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
nuclear@1 784 */
nuclear@1 785 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
nuclear@1 786 #endif
nuclear@1 787
nuclear@1 788 #if defined(PNG_sRGB_SUPPORTED)
nuclear@1 789 /* GR-P, 0.96a */
nuclear@1 790 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
nuclear@1 791 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
nuclear@1 792 #endif
nuclear@1 793
nuclear@1 794 #if defined(PNG_TEXT_SUPPORTED)
nuclear@1 795 /* The tEXt, and zTXt chunks contain human-readable textual data in
nuclear@1 796 * uncompressed, compressed, and optionally compressed forms, respectively.
nuclear@1 797 * The data in "text" is an array of pointers to uncompressed,
nuclear@1 798 * null-terminated C strings. Each chunk has a keyword that describes the
nuclear@1 799 * textual data contained in that chunk. Keywords are not required to be
nuclear@1 800 * unique, and the text string may be empty. Any number of text chunks may
nuclear@1 801 * be in an image.
nuclear@1 802 */
nuclear@1 803 int num_text; /* number of comments read/to write */
nuclear@1 804 int max_text; /* current size of text array */
nuclear@1 805 png_textp text; /* array of comments read/to write */
nuclear@1 806 #endif /* PNG_TEXT_SUPPORTED */
nuclear@1 807
nuclear@1 808 #if defined(PNG_tIME_SUPPORTED)
nuclear@1 809 /* The tIME chunk holds the last time the displayed image data was
nuclear@1 810 * modified. See the png_time struct for the contents of this struct.
nuclear@1 811 */
nuclear@1 812 png_time mod_time;
nuclear@1 813 #endif
nuclear@1 814
nuclear@1 815 #if defined(PNG_sBIT_SUPPORTED)
nuclear@1 816 /* The sBIT chunk specifies the number of significant high-order bits
nuclear@1 817 * in the pixel data. Values are in the range [1, bit_depth], and are
nuclear@1 818 * only specified for the channels in the pixel data. The contents of
nuclear@1 819 * the low-order bits is not specified. Data is valid if
nuclear@1 820 * (valid & PNG_INFO_sBIT) is non-zero.
nuclear@1 821 */
nuclear@1 822 png_color_8 sig_bit; /* significant bits in color channels */
nuclear@1 823 #endif
nuclear@1 824
nuclear@1 825 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
nuclear@1 826 defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 827 /* The tRNS chunk supplies transparency data for paletted images and
nuclear@1 828 * other image types that don't need a full alpha channel. There are
nuclear@1 829 * "num_trans" transparency values for a paletted image, stored in the
nuclear@1 830 * same order as the palette colors, starting from index 0. Values
nuclear@1 831 * for the data are in the range [0, 255], ranging from fully transparent
nuclear@1 832 * to fully opaque, respectively. For non-paletted images, there is a
nuclear@1 833 * single color specified that should be treated as fully transparent.
nuclear@1 834 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
nuclear@1 835 */
nuclear@1 836 png_bytep trans; /* transparent values for paletted image */
nuclear@1 837 png_color_16 trans_values; /* transparent color for non-palette image */
nuclear@1 838 #endif
nuclear@1 839
nuclear@1 840 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 841 /* The bKGD chunk gives the suggested image background color if the
nuclear@1 842 * display program does not have its own background color and the image
nuclear@1 843 * is needs to composited onto a background before display. The colors
nuclear@1 844 * in "background" are normally in the same color space/depth as the
nuclear@1 845 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
nuclear@1 846 */
nuclear@1 847 png_color_16 background;
nuclear@1 848 #endif
nuclear@1 849
nuclear@1 850 #if defined(PNG_oFFs_SUPPORTED)
nuclear@1 851 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
nuclear@1 852 * and downwards from the top-left corner of the display, page, or other
nuclear@1 853 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
nuclear@1 854 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
nuclear@1 855 */
nuclear@1 856 png_int_32 x_offset; /* x offset on page */
nuclear@1 857 png_int_32 y_offset; /* y offset on page */
nuclear@1 858 png_byte offset_unit_type; /* offset units type */
nuclear@1 859 #endif
nuclear@1 860
nuclear@1 861 #if defined(PNG_pHYs_SUPPORTED)
nuclear@1 862 /* The pHYs chunk gives the physical pixel density of the image for
nuclear@1 863 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
nuclear@1 864 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
nuclear@1 865 */
nuclear@1 866 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
nuclear@1 867 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
nuclear@1 868 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
nuclear@1 869 #endif
nuclear@1 870
nuclear@1 871 #if defined(PNG_hIST_SUPPORTED)
nuclear@1 872 /* The hIST chunk contains the relative frequency or importance of the
nuclear@1 873 * various palette entries, so that a viewer can intelligently select a
nuclear@1 874 * reduced-color palette, if required. Data is an array of "num_palette"
nuclear@1 875 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
nuclear@1 876 * is non-zero.
nuclear@1 877 */
nuclear@1 878 png_uint_16p hist;
nuclear@1 879 #endif
nuclear@1 880
nuclear@1 881 #ifdef PNG_cHRM_SUPPORTED
nuclear@1 882 /* The cHRM chunk describes the CIE color characteristics of the monitor
nuclear@1 883 * on which the PNG was created. This data allows the viewer to do gamut
nuclear@1 884 * mapping of the input image to ensure that the viewer sees the same
nuclear@1 885 * colors in the image as the creator. Values are in the range
nuclear@1 886 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
nuclear@1 887 */
nuclear@1 888 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 889 float x_white;
nuclear@1 890 float y_white;
nuclear@1 891 float x_red;
nuclear@1 892 float y_red;
nuclear@1 893 float x_green;
nuclear@1 894 float y_green;
nuclear@1 895 float x_blue;
nuclear@1 896 float y_blue;
nuclear@1 897 #endif
nuclear@1 898 #endif
nuclear@1 899
nuclear@1 900 #if defined(PNG_pCAL_SUPPORTED)
nuclear@1 901 /* The pCAL chunk describes a transformation between the stored pixel
nuclear@1 902 * values and original physical data values used to create the image.
nuclear@1 903 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
nuclear@1 904 * range given by [pcal_X0, pcal_X1], and are further transformed by a
nuclear@1 905 * (possibly non-linear) transformation function given by "pcal_type"
nuclear@1 906 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
nuclear@1 907 * defines below, and the PNG-Group's PNG extensions document for a
nuclear@1 908 * complete description of the transformations and how they should be
nuclear@1 909 * implemented, and for a description of the ASCII parameter strings.
nuclear@1 910 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
nuclear@1 911 */
nuclear@1 912 png_charp pcal_purpose; /* pCAL chunk description string */
nuclear@1 913 png_int_32 pcal_X0; /* minimum value */
nuclear@1 914 png_int_32 pcal_X1; /* maximum value */
nuclear@1 915 png_charp pcal_units; /* Latin-1 string giving physical units */
nuclear@1 916 png_charpp pcal_params; /* ASCII strings containing parameter values */
nuclear@1 917 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
nuclear@1 918 png_byte pcal_nparams; /* number of parameters given in pcal_params */
nuclear@1 919 #endif
nuclear@1 920
nuclear@1 921 /* New members added in libpng-1.0.6 */
nuclear@1 922 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 923 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
nuclear@1 924 #endif
nuclear@1 925
nuclear@1 926 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 927 /* storage for unknown chunks that the library doesn't recognize. */
nuclear@1 928 png_unknown_chunkp unknown_chunks;
nuclear@1 929 png_size_t unknown_chunks_num;
nuclear@1 930 #endif
nuclear@1 931
nuclear@1 932 #if defined(PNG_iCCP_SUPPORTED)
nuclear@1 933 /* iCCP chunk data. */
nuclear@1 934 png_charp iccp_name; /* profile name */
nuclear@1 935 png_charp iccp_profile; /* International Color Consortium profile data */
nuclear@1 936 /* Note to maintainer: should be png_bytep */
nuclear@1 937 png_uint_32 iccp_proflen; /* ICC profile data length */
nuclear@1 938 png_byte iccp_compression; /* Always zero */
nuclear@1 939 #endif
nuclear@1 940
nuclear@1 941 #if defined(PNG_sPLT_SUPPORTED)
nuclear@1 942 /* data on sPLT chunks (there may be more than one). */
nuclear@1 943 png_sPLT_tp splt_palettes;
nuclear@1 944 png_uint_32 splt_palettes_num;
nuclear@1 945 #endif
nuclear@1 946
nuclear@1 947 #if defined(PNG_sCAL_SUPPORTED)
nuclear@1 948 /* The sCAL chunk describes the actual physical dimensions of the
nuclear@1 949 * subject matter of the graphic. The chunk contains a unit specification
nuclear@1 950 * a byte value, and two ASCII strings representing floating-point
nuclear@1 951 * values. The values are width and height corresponsing to one pixel
nuclear@1 952 * in the image. This external representation is converted to double
nuclear@1 953 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
nuclear@1 954 */
nuclear@1 955 png_byte scal_unit; /* unit of physical scale */
nuclear@1 956 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 957 double scal_pixel_width; /* width of one pixel */
nuclear@1 958 double scal_pixel_height; /* height of one pixel */
nuclear@1 959 #endif
nuclear@1 960 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 961 png_charp scal_s_width; /* string containing height */
nuclear@1 962 png_charp scal_s_height; /* string containing width */
nuclear@1 963 #endif
nuclear@1 964 #endif
nuclear@1 965
nuclear@1 966 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@1 967 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
nuclear@1 968 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
nuclear@1 969 png_bytepp row_pointers; /* the image bits */
nuclear@1 970 #endif
nuclear@1 971
nuclear@1 972 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
nuclear@1 973 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
nuclear@1 974 #endif
nuclear@1 975
nuclear@1 976 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
nuclear@1 977 png_fixed_point int_x_white;
nuclear@1 978 png_fixed_point int_y_white;
nuclear@1 979 png_fixed_point int_x_red;
nuclear@1 980 png_fixed_point int_y_red;
nuclear@1 981 png_fixed_point int_x_green;
nuclear@1 982 png_fixed_point int_y_green;
nuclear@1 983 png_fixed_point int_x_blue;
nuclear@1 984 png_fixed_point int_y_blue;
nuclear@1 985 #endif
nuclear@1 986
nuclear@1 987 } png_info;
nuclear@1 988
nuclear@1 989 typedef png_info FAR * png_infop;
nuclear@1 990 typedef png_info FAR * FAR * png_infopp;
nuclear@1 991
nuclear@1 992 /* Maximum positive integer used in PNG is (2^31)-1 */
nuclear@1 993 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
nuclear@1 994 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
nuclear@1 995 #define PNG_SIZE_MAX ((png_size_t)(-1))
nuclear@1 996 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 997 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
nuclear@1 998 #define PNG_MAX_UINT PNG_UINT_31_MAX
nuclear@1 999 #endif
nuclear@1 1000
nuclear@1 1001 /* These describe the color_type field in png_info. */
nuclear@1 1002 /* color type masks */
nuclear@1 1003 #define PNG_COLOR_MASK_PALETTE 1
nuclear@1 1004 #define PNG_COLOR_MASK_COLOR 2
nuclear@1 1005 #define PNG_COLOR_MASK_ALPHA 4
nuclear@1 1006
nuclear@1 1007 /* color types. Note that not all combinations are legal */
nuclear@1 1008 #define PNG_COLOR_TYPE_GRAY 0
nuclear@1 1009 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
nuclear@1 1010 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
nuclear@1 1011 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
nuclear@1 1012 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
nuclear@1 1013 /* aliases */
nuclear@1 1014 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
nuclear@1 1015 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
nuclear@1 1016
nuclear@1 1017 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
nuclear@1 1018 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
nuclear@1 1019 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
nuclear@1 1020
nuclear@1 1021 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
nuclear@1 1022 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
nuclear@1 1023 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
nuclear@1 1024 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
nuclear@1 1025
nuclear@1 1026 /* These are for the interlacing type. These values should NOT be changed. */
nuclear@1 1027 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
nuclear@1 1028 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
nuclear@1 1029 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
nuclear@1 1030
nuclear@1 1031 /* These are for the oFFs chunk. These values should NOT be changed. */
nuclear@1 1032 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
nuclear@1 1033 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
nuclear@1 1034 #define PNG_OFFSET_LAST 2 /* Not a valid value */
nuclear@1 1035
nuclear@1 1036 /* These are for the pCAL chunk. These values should NOT be changed. */
nuclear@1 1037 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
nuclear@1 1038 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
nuclear@1 1039 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
nuclear@1 1040 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
nuclear@1 1041 #define PNG_EQUATION_LAST 4 /* Not a valid value */
nuclear@1 1042
nuclear@1 1043 /* These are for the sCAL chunk. These values should NOT be changed. */
nuclear@1 1044 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
nuclear@1 1045 #define PNG_SCALE_METER 1 /* meters per pixel */
nuclear@1 1046 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
nuclear@1 1047 #define PNG_SCALE_LAST 3 /* Not a valid value */
nuclear@1 1048
nuclear@1 1049 /* These are for the pHYs chunk. These values should NOT be changed. */
nuclear@1 1050 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
nuclear@1 1051 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
nuclear@1 1052 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
nuclear@1 1053
nuclear@1 1054 /* These are for the sRGB chunk. These values should NOT be changed. */
nuclear@1 1055 #define PNG_sRGB_INTENT_PERCEPTUAL 0
nuclear@1 1056 #define PNG_sRGB_INTENT_RELATIVE 1
nuclear@1 1057 #define PNG_sRGB_INTENT_SATURATION 2
nuclear@1 1058 #define PNG_sRGB_INTENT_ABSOLUTE 3
nuclear@1 1059 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
nuclear@1 1060
nuclear@1 1061 /* This is for text chunks */
nuclear@1 1062 #define PNG_KEYWORD_MAX_LENGTH 79
nuclear@1 1063
nuclear@1 1064 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
nuclear@1 1065 #define PNG_MAX_PALETTE_LENGTH 256
nuclear@1 1066
nuclear@1 1067 /* These determine if an ancillary chunk's data has been successfully read
nuclear@1 1068 * from the PNG header, or if the application has filled in the corresponding
nuclear@1 1069 * data in the info_struct to be written into the output file. The values
nuclear@1 1070 * of the PNG_INFO_<chunk> defines should NOT be changed.
nuclear@1 1071 */
nuclear@1 1072 #define PNG_INFO_gAMA 0x0001
nuclear@1 1073 #define PNG_INFO_sBIT 0x0002
nuclear@1 1074 #define PNG_INFO_cHRM 0x0004
nuclear@1 1075 #define PNG_INFO_PLTE 0x0008
nuclear@1 1076 #define PNG_INFO_tRNS 0x0010
nuclear@1 1077 #define PNG_INFO_bKGD 0x0020
nuclear@1 1078 #define PNG_INFO_hIST 0x0040
nuclear@1 1079 #define PNG_INFO_pHYs 0x0080
nuclear@1 1080 #define PNG_INFO_oFFs 0x0100
nuclear@1 1081 #define PNG_INFO_tIME 0x0200
nuclear@1 1082 #define PNG_INFO_pCAL 0x0400
nuclear@1 1083 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
nuclear@1 1084 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
nuclear@1 1085 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
nuclear@1 1086 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
nuclear@1 1087 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
nuclear@1 1088
nuclear@1 1089 /* This is used for the transformation routines, as some of them
nuclear@1 1090 * change these values for the row. It also should enable using
nuclear@1 1091 * the routines for other purposes.
nuclear@1 1092 */
nuclear@1 1093 typedef struct png_row_info_struct
nuclear@1 1094 {
nuclear@1 1095 png_uint_32 width; /* width of row */
nuclear@1 1096 png_uint_32 rowbytes; /* number of bytes in row */
nuclear@1 1097 png_byte color_type; /* color type of row */
nuclear@1 1098 png_byte bit_depth; /* bit depth of row */
nuclear@1 1099 png_byte channels; /* number of channels (1, 2, 3, or 4) */
nuclear@1 1100 png_byte pixel_depth; /* bits per pixel (depth * channels) */
nuclear@1 1101 } png_row_info;
nuclear@1 1102
nuclear@1 1103 typedef png_row_info FAR * png_row_infop;
nuclear@1 1104 typedef png_row_info FAR * FAR * png_row_infopp;
nuclear@1 1105
nuclear@1 1106 /* These are the function types for the I/O functions and for the functions
nuclear@1 1107 * that allow the user to override the default I/O functions with his or her
nuclear@1 1108 * own. The png_error_ptr type should match that of user-supplied warning
nuclear@1 1109 * and error functions, while the png_rw_ptr type should match that of the
nuclear@1 1110 * user read/write data functions.
nuclear@1 1111 */
nuclear@1 1112 typedef struct png_struct_def png_struct;
nuclear@1 1113 typedef png_struct FAR * png_structp;
nuclear@1 1114
nuclear@1 1115 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
nuclear@1 1116 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
nuclear@1 1117 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
nuclear@1 1118 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@1 1119 int));
nuclear@1 1120 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@1 1121 int));
nuclear@1 1122
nuclear@1 1123 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 1124 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
nuclear@1 1125 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
nuclear@1 1126 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
nuclear@1 1127 png_uint_32, int));
nuclear@1 1128 #endif
nuclear@1 1129
nuclear@1 1130 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 1131 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 1132 defined(PNG_LEGACY_SUPPORTED)
nuclear@1 1133 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
nuclear@1 1134 png_row_infop, png_bytep));
nuclear@1 1135 #endif
nuclear@1 1136
nuclear@1 1137 #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@1 1138 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
nuclear@1 1139 #endif
nuclear@1 1140 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 1141 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
nuclear@1 1142 #endif
nuclear@1 1143
nuclear@1 1144 /* Transform masks for the high-level interface */
nuclear@1 1145 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
nuclear@1 1146 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
nuclear@1 1147 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
nuclear@1 1148 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
nuclear@1 1149 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
nuclear@1 1150 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
nuclear@1 1151 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
nuclear@1 1152 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
nuclear@1 1153 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
nuclear@1 1154 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
nuclear@1 1155 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
nuclear@1 1156 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
nuclear@1 1157 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
nuclear@1 1158
nuclear@1 1159 /* Flags for MNG supported features */
nuclear@1 1160 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
nuclear@1 1161 #define PNG_FLAG_MNG_FILTER_64 0x04
nuclear@1 1162 #define PNG_ALL_MNG_FEATURES 0x05
nuclear@1 1163
nuclear@1 1164 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
nuclear@1 1165 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
nuclear@1 1166
nuclear@1 1167 /* The structure that holds the information to read and write PNG files.
nuclear@1 1168 * The only people who need to care about what is inside of this are the
nuclear@1 1169 * people who will be modifying the library for their own special needs.
nuclear@1 1170 * It should NOT be accessed directly by an application, except to store
nuclear@1 1171 * the jmp_buf.
nuclear@1 1172 */
nuclear@1 1173
nuclear@1 1174 struct png_struct_def
nuclear@1 1175 {
nuclear@1 1176 #ifdef PNG_SETJMP_SUPPORTED
nuclear@1 1177 jmp_buf jmpbuf; /* used in png_error */
nuclear@1 1178 #endif
nuclear@1 1179 png_error_ptr error_fn; /* function for printing errors and aborting */
nuclear@1 1180 png_error_ptr warning_fn; /* function for printing warnings */
nuclear@1 1181 png_voidp error_ptr; /* user supplied struct for error functions */
nuclear@1 1182 png_rw_ptr write_data_fn; /* function for writing output data */
nuclear@1 1183 png_rw_ptr read_data_fn; /* function for reading input data */
nuclear@1 1184 png_voidp io_ptr; /* ptr to application struct for I/O functions */
nuclear@1 1185
nuclear@1 1186 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
nuclear@1 1187 png_user_transform_ptr read_user_transform_fn; /* user read transform */
nuclear@1 1188 #endif
nuclear@1 1189
nuclear@1 1190 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@1 1191 png_user_transform_ptr write_user_transform_fn; /* user write transform */
nuclear@1 1192 #endif
nuclear@1 1193
nuclear@1 1194 /* These were added in libpng-1.0.2 */
nuclear@1 1195 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
nuclear@1 1196 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 1197 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@1 1198 png_voidp user_transform_ptr; /* user supplied struct for user transform */
nuclear@1 1199 png_byte user_transform_depth; /* bit depth of user transformed pixels */
nuclear@1 1200 png_byte user_transform_channels; /* channels in user transformed pixels */
nuclear@1 1201 #endif
nuclear@1 1202 #endif
nuclear@1 1203
nuclear@1 1204 png_uint_32 mode; /* tells us where we are in the PNG file */
nuclear@1 1205 png_uint_32 flags; /* flags indicating various things to libpng */
nuclear@1 1206 png_uint_32 transformations; /* which transformations to perform */
nuclear@1 1207
nuclear@1 1208 z_stream zstream; /* pointer to decompression structure (below) */
nuclear@1 1209 png_bytep zbuf; /* buffer for zlib */
nuclear@1 1210 png_size_t zbuf_size; /* size of zbuf */
nuclear@1 1211 int zlib_level; /* holds zlib compression level */
nuclear@1 1212 int zlib_method; /* holds zlib compression method */
nuclear@1 1213 int zlib_window_bits; /* holds zlib compression window bits */
nuclear@1 1214 int zlib_mem_level; /* holds zlib compression memory level */
nuclear@1 1215 int zlib_strategy; /* holds zlib compression strategy */
nuclear@1 1216
nuclear@1 1217 png_uint_32 width; /* width of image in pixels */
nuclear@1 1218 png_uint_32 height; /* height of image in pixels */
nuclear@1 1219 png_uint_32 num_rows; /* number of rows in current pass */
nuclear@1 1220 png_uint_32 usr_width; /* width of row at start of write */
nuclear@1 1221 png_uint_32 rowbytes; /* size of row in bytes */
nuclear@1 1222 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
nuclear@1 1223 png_uint_32 iwidth; /* width of current interlaced row in pixels */
nuclear@1 1224 png_uint_32 row_number; /* current row in interlace pass */
nuclear@1 1225 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
nuclear@1 1226 png_bytep row_buf; /* buffer to save current (unfiltered) row */
nuclear@1 1227 #ifndef PNG_NO_WRITE_FILTER
nuclear@1 1228 png_bytep sub_row; /* buffer to save "sub" row when filtering */
nuclear@1 1229 png_bytep up_row; /* buffer to save "up" row when filtering */
nuclear@1 1230 png_bytep avg_row; /* buffer to save "avg" row when filtering */
nuclear@1 1231 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
nuclear@1 1232 #endif
nuclear@1 1233 png_row_info row_info; /* used for transformation routines */
nuclear@1 1234
nuclear@1 1235 png_uint_32 idat_size; /* current IDAT size for read */
nuclear@1 1236 png_uint_32 crc; /* current chunk CRC value */
nuclear@1 1237 png_colorp palette; /* palette from the input file */
nuclear@1 1238 png_uint_16 num_palette; /* number of color entries in palette */
nuclear@1 1239 png_uint_16 num_trans; /* number of transparency values */
nuclear@1 1240 png_byte chunk_name[5]; /* null-terminated name of current chunk */
nuclear@1 1241 png_byte compression; /* file compression type (always 0) */
nuclear@1 1242 png_byte filter; /* file filter type (always 0) */
nuclear@1 1243 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@1 1244 png_byte pass; /* current interlace pass (0 - 6) */
nuclear@1 1245 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
nuclear@1 1246 png_byte color_type; /* color type of file */
nuclear@1 1247 png_byte bit_depth; /* bit depth of file */
nuclear@1 1248 png_byte usr_bit_depth; /* bit depth of users row */
nuclear@1 1249 png_byte pixel_depth; /* number of bits per pixel */
nuclear@1 1250 png_byte channels; /* number of channels in file */
nuclear@1 1251 png_byte usr_channels; /* channels at start of write */
nuclear@1 1252 png_byte sig_bytes; /* magic bytes read/written from start of file */
nuclear@1 1253
nuclear@1 1254 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@1 1255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@1 1256 png_byte filler; /* filler byte for pixel expansion */
nuclear@1 1257 #else
nuclear@1 1258 png_uint_16 filler; /* filler bytes for pixel expansion */
nuclear@1 1259 #endif
nuclear@1 1260 #endif
nuclear@1 1261
nuclear@1 1262 #if defined(PNG_bKGD_SUPPORTED)
nuclear@1 1263 png_byte background_gamma_type;
nuclear@1 1264 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1265 float background_gamma;
nuclear@1 1266 # endif
nuclear@1 1267 png_color_16 background; /* background color in screen gamma space */
nuclear@1 1268 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 1269 png_color_16 background_1; /* background normalized to gamma 1.0 */
nuclear@1 1270 #endif
nuclear@1 1271 #endif /* PNG_bKGD_SUPPORTED */
nuclear@1 1272
nuclear@1 1273 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 1274 png_flush_ptr output_flush_fn;/* Function for flushing output */
nuclear@1 1275 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
nuclear@1 1276 png_uint_32 flush_rows; /* number of rows written since last flush */
nuclear@1 1277 #endif
nuclear@1 1278
nuclear@1 1279 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1280 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
nuclear@1 1281 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1282 float gamma; /* file gamma value */
nuclear@1 1283 float screen_gamma; /* screen gamma value (display_exponent) */
nuclear@1 1284 #endif
nuclear@1 1285 #endif
nuclear@1 1286
nuclear@1 1287 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1288 png_bytep gamma_table; /* gamma table for 8-bit depth files */
nuclear@1 1289 png_bytep gamma_from_1; /* converts from 1.0 to screen */
nuclear@1 1290 png_bytep gamma_to_1; /* converts from file to 1.0 */
nuclear@1 1291 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
nuclear@1 1292 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
nuclear@1 1293 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
nuclear@1 1294 #endif
nuclear@1 1295
nuclear@1 1296 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
nuclear@1 1297 png_color_8 sig_bit; /* significant bits in each available channel */
nuclear@1 1298 #endif
nuclear@1 1299
nuclear@1 1300 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@1 1301 png_color_8 shift; /* shift for significant bit tranformation */
nuclear@1 1302 #endif
nuclear@1 1303
nuclear@1 1304 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
nuclear@1 1305 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1306 png_bytep trans; /* transparency values for paletted files */
nuclear@1 1307 png_color_16 trans_values; /* transparency values for non-paletted files */
nuclear@1 1308 #endif
nuclear@1 1309
nuclear@1 1310 png_read_status_ptr read_row_fn; /* called after each row is decoded */
nuclear@1 1311 png_write_status_ptr write_row_fn; /* called after each row is encoded */
nuclear@1 1312 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 1313 png_progressive_info_ptr info_fn; /* called after header data fully read */
nuclear@1 1314 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
nuclear@1 1315 png_progressive_end_ptr end_fn; /* called after image is complete */
nuclear@1 1316 png_bytep save_buffer_ptr; /* current location in save_buffer */
nuclear@1 1317 png_bytep save_buffer; /* buffer for previously read data */
nuclear@1 1318 png_bytep current_buffer_ptr; /* current location in current_buffer */
nuclear@1 1319 png_bytep current_buffer; /* buffer for recently used data */
nuclear@1 1320 png_uint_32 push_length; /* size of current input chunk */
nuclear@1 1321 png_uint_32 skip_length; /* bytes to skip in input data */
nuclear@1 1322 png_size_t save_buffer_size; /* amount of data now in save_buffer */
nuclear@1 1323 png_size_t save_buffer_max; /* total size of save_buffer */
nuclear@1 1324 png_size_t buffer_size; /* total amount of available input data */
nuclear@1 1325 png_size_t current_buffer_size; /* amount of data now in current_buffer */
nuclear@1 1326 int process_mode; /* what push library is currently doing */
nuclear@1 1327 int cur_palette; /* current push library palette index */
nuclear@1 1328
nuclear@1 1329 # if defined(PNG_TEXT_SUPPORTED)
nuclear@1 1330 png_size_t current_text_size; /* current size of text input data */
nuclear@1 1331 png_size_t current_text_left; /* how much text left to read in input */
nuclear@1 1332 png_charp current_text; /* current text chunk buffer */
nuclear@1 1333 png_charp current_text_ptr; /* current location in current_text */
nuclear@1 1334 # endif /* PNG_TEXT_SUPPORTED */
nuclear@1 1335 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@1 1336
nuclear@1 1337 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@1 1338 /* for the Borland special 64K segment handler */
nuclear@1 1339 png_bytepp offset_table_ptr;
nuclear@1 1340 png_bytep offset_table;
nuclear@1 1341 png_uint_16 offset_table_number;
nuclear@1 1342 png_uint_16 offset_table_count;
nuclear@1 1343 png_uint_16 offset_table_count_free;
nuclear@1 1344 #endif
nuclear@1 1345
nuclear@1 1346 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@1 1347 png_bytep palette_lookup; /* lookup table for dithering */
nuclear@1 1348 png_bytep dither_index; /* index translation for palette files */
nuclear@1 1349 #endif
nuclear@1 1350
nuclear@1 1351 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
nuclear@1 1352 png_uint_16p hist; /* histogram */
nuclear@1 1353 #endif
nuclear@1 1354
nuclear@1 1355 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@1 1356 png_byte heuristic_method; /* heuristic for row filter selection */
nuclear@1 1357 png_byte num_prev_filters; /* number of weights for previous rows */
nuclear@1 1358 png_bytep prev_filters; /* filter type(s) of previous row(s) */
nuclear@1 1359 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
nuclear@1 1360 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
nuclear@1 1361 png_uint_16p filter_costs; /* relative filter calculation cost */
nuclear@1 1362 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
nuclear@1 1363 #endif
nuclear@1 1364
nuclear@1 1365 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@1 1366 png_charp time_buffer; /* String to hold RFC 1123 time text */
nuclear@1 1367 #endif
nuclear@1 1368
nuclear@1 1369 /* New members added in libpng-1.0.6 */
nuclear@1 1370
nuclear@1 1371 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 1372 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
nuclear@1 1373 #endif
nuclear@1 1374
nuclear@1 1375 #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@1 1376 png_voidp user_chunk_ptr;
nuclear@1 1377 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
nuclear@1 1378 #endif
nuclear@1 1379
nuclear@1 1380 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 1381 int num_chunk_list;
nuclear@1 1382 png_bytep chunk_list;
nuclear@1 1383 #endif
nuclear@1 1384
nuclear@1 1385 /* New members added in libpng-1.0.3 */
nuclear@1 1386 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@1 1387 png_byte rgb_to_gray_status;
nuclear@1 1388 /* These were changed from png_byte in libpng-1.0.6 */
nuclear@1 1389 png_uint_16 rgb_to_gray_red_coeff;
nuclear@1 1390 png_uint_16 rgb_to_gray_green_coeff;
nuclear@1 1391 png_uint_16 rgb_to_gray_blue_coeff;
nuclear@1 1392 #endif
nuclear@1 1393
nuclear@1 1394 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
nuclear@1 1395 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
nuclear@1 1396 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@1 1397 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@1 1398 /* changed from png_byte to png_uint_32 at version 1.2.0 */
nuclear@1 1399 #ifdef PNG_1_0_X
nuclear@1 1400 png_byte mng_features_permitted;
nuclear@1 1401 #else
nuclear@1 1402 png_uint_32 mng_features_permitted;
nuclear@1 1403 #endif /* PNG_1_0_X */
nuclear@1 1404 #endif
nuclear@1 1405
nuclear@1 1406 /* New member added in libpng-1.0.7 */
nuclear@1 1407 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1408 png_fixed_point int_gamma;
nuclear@1 1409 #endif
nuclear@1 1410
nuclear@1 1411 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
nuclear@1 1412 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@1 1413 png_byte filter_type;
nuclear@1 1414 #endif
nuclear@1 1415
nuclear@1 1416 #if defined(PNG_1_0_X)
nuclear@1 1417 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
nuclear@1 1418 png_uint_32 row_buf_size;
nuclear@1 1419 #endif
nuclear@1 1420
nuclear@1 1421 /* New members added in libpng-1.2.0 */
nuclear@1 1422 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@1 1423 # if !defined(PNG_1_0_X)
nuclear@1 1424 # if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@1 1425 png_byte mmx_bitdepth_threshold;
nuclear@1 1426 png_uint_32 mmx_rowbytes_threshold;
nuclear@1 1427 # endif
nuclear@1 1428 png_uint_32 asm_flags;
nuclear@1 1429 # endif
nuclear@1 1430 #endif
nuclear@1 1431
nuclear@1 1432 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
nuclear@1 1433 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1434 png_voidp mem_ptr; /* user supplied struct for mem functions */
nuclear@1 1435 png_malloc_ptr malloc_fn; /* function for allocating memory */
nuclear@1 1436 png_free_ptr free_fn; /* function for freeing memory */
nuclear@1 1437 #endif
nuclear@1 1438
nuclear@1 1439 /* New member added in libpng-1.0.13 and 1.2.0 */
nuclear@1 1440 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
nuclear@1 1441
nuclear@1 1442 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@1 1443 /* The following three members were added at version 1.0.14 and 1.2.4 */
nuclear@1 1444 png_bytep dither_sort; /* working sort array */
nuclear@1 1445 png_bytep index_to_palette; /* where the original index currently is */
nuclear@1 1446 /* in the palette */
nuclear@1 1447 png_bytep palette_to_index; /* which original index points to this */
nuclear@1 1448 /* palette color */
nuclear@1 1449 #endif
nuclear@1 1450
nuclear@1 1451 /* New members added in libpng-1.0.16 and 1.2.6 */
nuclear@1 1452 png_byte compression_type;
nuclear@1 1453
nuclear@1 1454 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@1 1455 png_uint_32 user_width_max;
nuclear@1 1456 png_uint_32 user_height_max;
nuclear@1 1457 #endif
nuclear@1 1458
nuclear@1 1459 /* New member added in libpng-1.0.25 and 1.2.17 */
nuclear@1 1460 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 1461 /* storage for unknown chunk that the library doesn't recognize. */
nuclear@1 1462 png_unknown_chunk unknown_chunk;
nuclear@1 1463 #endif
nuclear@1 1464
nuclear@1 1465 /* New members added in libpng-1.2.26 */
nuclear@1 1466 png_uint_32 old_big_row_buf_size, old_prev_row_size;
nuclear@1 1467
nuclear@1 1468 /* New member added in libpng-1.2.30 */
nuclear@1 1469 png_charp chunkdata; /* buffer for reading chunk data */
nuclear@1 1470
nuclear@1 1471 };
nuclear@1 1472
nuclear@1 1473
nuclear@1 1474 /* This triggers a compiler error in png.c, if png.c and png.h
nuclear@1 1475 * do not agree upon the version number.
nuclear@1 1476 */
nuclear@1 1477 typedef png_structp version_1_2_33;
nuclear@1 1478
nuclear@1 1479 typedef png_struct FAR * FAR * png_structpp;
nuclear@1 1480
nuclear@1 1481 /* Here are the function definitions most commonly used. This is not
nuclear@1 1482 * the place to find out how to use libpng. See libpng.txt for the
nuclear@1 1483 * full explanation, see example.c for the summary. This just provides
nuclear@1 1484 * a simple one line description of the use of each function.
nuclear@1 1485 */
nuclear@1 1486
nuclear@1 1487 /* Returns the version number of the library */
nuclear@1 1488 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
nuclear@1 1489
nuclear@1 1490 /* Tell lib we have already handled the first <num_bytes> magic bytes.
nuclear@1 1491 * Handling more than 8 bytes from the beginning of the file is an error.
nuclear@1 1492 */
nuclear@1 1493 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
nuclear@1 1494 int num_bytes));
nuclear@1 1495
nuclear@1 1496 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
nuclear@1 1497 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
nuclear@1 1498 * signature, and non-zero otherwise. Having num_to_check == 0 or
nuclear@1 1499 * start > 7 will always fail (ie return non-zero).
nuclear@1 1500 */
nuclear@1 1501 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
nuclear@1 1502 png_size_t num_to_check));
nuclear@1 1503
nuclear@1 1504 /* Simple signature checking function. This is the same as calling
nuclear@1 1505 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
nuclear@1 1506 */
nuclear@1 1507 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
nuclear@1 1508
nuclear@1 1509 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
nuclear@1 1510 extern PNG_EXPORT(png_structp,png_create_read_struct)
nuclear@1 1511 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 1512 png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@1 1513
nuclear@1 1514 /* Allocate and initialize png_ptr struct for writing, and any other memory */
nuclear@1 1515 extern PNG_EXPORT(png_structp,png_create_write_struct)
nuclear@1 1516 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 1517 png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@1 1518
nuclear@1 1519 #ifdef PNG_WRITE_SUPPORTED
nuclear@1 1520 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
nuclear@1 1521 PNGARG((png_structp png_ptr));
nuclear@1 1522 #endif
nuclear@1 1523
nuclear@1 1524 #ifdef PNG_WRITE_SUPPORTED
nuclear@1 1525 extern PNG_EXPORT(void,png_set_compression_buffer_size)
nuclear@1 1526 PNGARG((png_structp png_ptr, png_uint_32 size));
nuclear@1 1527 #endif
nuclear@1 1528
nuclear@1 1529 /* Reset the compression stream */
nuclear@1 1530 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
nuclear@1 1531
nuclear@1 1532 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
nuclear@1 1533 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1534 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
nuclear@1 1535 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 1536 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@1 1537 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@1 1538 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
nuclear@1 1539 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@1 1540 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@1 1541 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@1 1542 #endif
nuclear@1 1543
nuclear@1 1544 /* Write a PNG chunk - size, type, (optional) data, CRC. */
nuclear@1 1545 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
nuclear@1 1546 png_bytep chunk_name, png_bytep data, png_size_t length));
nuclear@1 1547
nuclear@1 1548 /* Write the start of a PNG chunk - length and chunk name. */
nuclear@1 1549 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
nuclear@1 1550 png_bytep chunk_name, png_uint_32 length));
nuclear@1 1551
nuclear@1 1552 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
nuclear@1 1553 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
nuclear@1 1554 png_bytep data, png_size_t length));
nuclear@1 1555
nuclear@1 1556 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
nuclear@1 1557 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
nuclear@1 1558
nuclear@1 1559 /* Allocate and initialize the info structure */
nuclear@1 1560 extern PNG_EXPORT(png_infop,png_create_info_struct)
nuclear@1 1561 PNGARG((png_structp png_ptr));
nuclear@1 1562
nuclear@1 1563 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 1564 /* Initialize the info structure (old interface - DEPRECATED) */
nuclear@1 1565 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
nuclear@1 1566 #undef png_info_init
nuclear@1 1567 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
nuclear@1 1568 png_sizeof(png_info));
nuclear@1 1569 #endif
nuclear@1 1570
nuclear@1 1571 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
nuclear@1 1572 png_size_t png_info_struct_size));
nuclear@1 1573
nuclear@1 1574 /* Writes all the PNG information before the image. */
nuclear@1 1575 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
nuclear@1 1576 png_infop info_ptr));
nuclear@1 1577 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
nuclear@1 1578 png_infop info_ptr));
nuclear@1 1579
nuclear@1 1580 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1581 /* read the information before the actual image data. */
nuclear@1 1582 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
nuclear@1 1583 png_infop info_ptr));
nuclear@1 1584 #endif
nuclear@1 1585
nuclear@1 1586 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@1 1587 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
nuclear@1 1588 PNGARG((png_structp png_ptr, png_timep ptime));
nuclear@1 1589 #endif
nuclear@1 1590
nuclear@1 1591 #if !defined(_WIN32_WCE)
nuclear@1 1592 /* "time.h" functions are not supported on WindowsCE */
nuclear@1 1593 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@1 1594 /* convert from a struct tm to png_time */
nuclear@1 1595 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
nuclear@1 1596 struct tm FAR * ttime));
nuclear@1 1597
nuclear@1 1598 /* convert from time_t to png_time. Uses gmtime() */
nuclear@1 1599 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
nuclear@1 1600 time_t ttime));
nuclear@1 1601 #endif /* PNG_WRITE_tIME_SUPPORTED */
nuclear@1 1602 #endif /* _WIN32_WCE */
nuclear@1 1603
nuclear@1 1604 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@1 1605 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
nuclear@1 1606 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
nuclear@1 1607 #if !defined(PNG_1_0_X)
nuclear@1 1608 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
nuclear@1 1609 png_ptr));
nuclear@1 1610 #endif
nuclear@1 1611 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
nuclear@1 1612 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
nuclear@1 1613 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 1614 /* Deprecated */
nuclear@1 1615 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
nuclear@1 1616 #endif
nuclear@1 1617 #endif
nuclear@1 1618
nuclear@1 1619 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@1 1620 /* Use blue, green, red order for pixels. */
nuclear@1 1621 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
nuclear@1 1622 #endif
nuclear@1 1623
nuclear@1 1624 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@1 1625 /* Expand the grayscale to 24-bit RGB if necessary. */
nuclear@1 1626 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
nuclear@1 1627 #endif
nuclear@1 1628
nuclear@1 1629 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@1 1630 /* Reduce RGB to grayscale. */
nuclear@1 1631 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1632 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
nuclear@1 1633 int error_action, double red, double green ));
nuclear@1 1634 #endif
nuclear@1 1635 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
nuclear@1 1636 int error_action, png_fixed_point red, png_fixed_point green ));
nuclear@1 1637 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
nuclear@1 1638 png_ptr));
nuclear@1 1639 #endif
nuclear@1 1640
nuclear@1 1641 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
nuclear@1 1642 png_colorp palette));
nuclear@1 1643
nuclear@1 1644 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@1 1645 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
nuclear@1 1646 #endif
nuclear@1 1647
nuclear@1 1648 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
nuclear@1 1649 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@1 1650 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
nuclear@1 1651 #endif
nuclear@1 1652
nuclear@1 1653 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
nuclear@1 1654 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@1 1655 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
nuclear@1 1656 #endif
nuclear@1 1657
nuclear@1 1658 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@1 1659 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
nuclear@1 1660 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
nuclear@1 1661 png_uint_32 filler, int flags));
nuclear@1 1662 /* The values of the PNG_FILLER_ defines should NOT be changed */
nuclear@1 1663 #define PNG_FILLER_BEFORE 0
nuclear@1 1664 #define PNG_FILLER_AFTER 1
nuclear@1 1665 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
nuclear@1 1666 #if !defined(PNG_1_0_X)
nuclear@1 1667 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
nuclear@1 1668 png_uint_32 filler, int flags));
nuclear@1 1669 #endif
nuclear@1 1670 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
nuclear@1 1671
nuclear@1 1672 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@1 1673 /* Swap bytes in 16-bit depth files. */
nuclear@1 1674 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
nuclear@1 1675 #endif
nuclear@1 1676
nuclear@1 1677 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@1 1678 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
nuclear@1 1679 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
nuclear@1 1680 #endif
nuclear@1 1681
nuclear@1 1682 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@1 1683 /* Swap packing order of pixels in bytes. */
nuclear@1 1684 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
nuclear@1 1685 #endif
nuclear@1 1686
nuclear@1 1687 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@1 1688 /* Converts files to legal bit depths. */
nuclear@1 1689 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
nuclear@1 1690 png_color_8p true_bits));
nuclear@1 1691 #endif
nuclear@1 1692
nuclear@1 1693 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
nuclear@1 1694 defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@1 1695 /* Have the code handle the interlacing. Returns the number of passes. */
nuclear@1 1696 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
nuclear@1 1697 #endif
nuclear@1 1698
nuclear@1 1699 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@1 1700 /* Invert monochrome files */
nuclear@1 1701 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
nuclear@1 1702 #endif
nuclear@1 1703
nuclear@1 1704 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 1705 /* Handle alpha and tRNS by replacing with a background color. */
nuclear@1 1706 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1707 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
nuclear@1 1708 png_color_16p background_color, int background_gamma_code,
nuclear@1 1709 int need_expand, double background_gamma));
nuclear@1 1710 #endif
nuclear@1 1711 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
nuclear@1 1712 #define PNG_BACKGROUND_GAMMA_SCREEN 1
nuclear@1 1713 #define PNG_BACKGROUND_GAMMA_FILE 2
nuclear@1 1714 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
nuclear@1 1715 #endif
nuclear@1 1716
nuclear@1 1717 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@1 1718 /* strip the second byte of information from a 16-bit depth file. */
nuclear@1 1719 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
nuclear@1 1720 #endif
nuclear@1 1721
nuclear@1 1722 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@1 1723 /* Turn on dithering, and reduce the palette to the number of colors available. */
nuclear@1 1724 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
nuclear@1 1725 png_colorp palette, int num_palette, int maximum_colors,
nuclear@1 1726 png_uint_16p histogram, int full_dither));
nuclear@1 1727 #endif
nuclear@1 1728
nuclear@1 1729 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 1730 /* Handle gamma correction. Screen_gamma=(display_exponent) */
nuclear@1 1731 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1732 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
nuclear@1 1733 double screen_gamma, double default_file_gamma));
nuclear@1 1734 #endif
nuclear@1 1735 #endif
nuclear@1 1736
nuclear@1 1737 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 1738 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@1 1739 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@1 1740 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
nuclear@1 1741 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
nuclear@1 1742 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
nuclear@1 1743 int empty_plte_permitted));
nuclear@1 1744 #endif
nuclear@1 1745 #endif
nuclear@1 1746
nuclear@1 1747 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 1748 /* Set how many lines between output flushes - 0 for no flushing */
nuclear@1 1749 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
nuclear@1 1750 /* Flush the current PNG output buffer */
nuclear@1 1751 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
nuclear@1 1752 #endif
nuclear@1 1753
nuclear@1 1754 /* optional update palette with requested transformations */
nuclear@1 1755 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
nuclear@1 1756
nuclear@1 1757 /* optional call to update the users info structure */
nuclear@1 1758 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
nuclear@1 1759 png_infop info_ptr));
nuclear@1 1760
nuclear@1 1761 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1762 /* read one or more rows of image data. */
nuclear@1 1763 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
nuclear@1 1764 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
nuclear@1 1765 #endif
nuclear@1 1766
nuclear@1 1767 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1768 /* read a row of data. */
nuclear@1 1769 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
nuclear@1 1770 png_bytep row,
nuclear@1 1771 png_bytep display_row));
nuclear@1 1772 #endif
nuclear@1 1773
nuclear@1 1774 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1775 /* read the whole image into memory at once. */
nuclear@1 1776 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
nuclear@1 1777 png_bytepp image));
nuclear@1 1778 #endif
nuclear@1 1779
nuclear@1 1780 /* write a row of image data */
nuclear@1 1781 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
nuclear@1 1782 png_bytep row));
nuclear@1 1783
nuclear@1 1784 /* write a few rows of image data */
nuclear@1 1785 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
nuclear@1 1786 png_bytepp row, png_uint_32 num_rows));
nuclear@1 1787
nuclear@1 1788 /* write the image data */
nuclear@1 1789 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
nuclear@1 1790 png_bytepp image));
nuclear@1 1791
nuclear@1 1792 /* writes the end of the PNG file. */
nuclear@1 1793 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
nuclear@1 1794 png_infop info_ptr));
nuclear@1 1795
nuclear@1 1796 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@1 1797 /* read the end of the PNG file. */
nuclear@1 1798 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
nuclear@1 1799 png_infop info_ptr));
nuclear@1 1800 #endif
nuclear@1 1801
nuclear@1 1802 /* free any memory associated with the png_info_struct */
nuclear@1 1803 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
nuclear@1 1804 png_infopp info_ptr_ptr));
nuclear@1 1805
nuclear@1 1806 /* free any memory associated with the png_struct and the png_info_structs */
nuclear@1 1807 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
nuclear@1 1808 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
nuclear@1 1809
nuclear@1 1810 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
nuclear@1 1811 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 1812 png_infop end_info_ptr));
nuclear@1 1813
nuclear@1 1814 /* free any memory associated with the png_struct and the png_info_structs */
nuclear@1 1815 extern PNG_EXPORT(void,png_destroy_write_struct)
nuclear@1 1816 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
nuclear@1 1817
nuclear@1 1818 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
nuclear@1 1819 extern void png_write_destroy PNGARG((png_structp png_ptr));
nuclear@1 1820
nuclear@1 1821 /* set the libpng method of handling chunk CRC errors */
nuclear@1 1822 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
nuclear@1 1823 int crit_action, int ancil_action));
nuclear@1 1824
nuclear@1 1825 /* Values for png_set_crc_action() to say how to handle CRC errors in
nuclear@1 1826 * ancillary and critical chunks, and whether to use the data contained
nuclear@1 1827 * therein. Note that it is impossible to "discard" data in a critical
nuclear@1 1828 * chunk. For versions prior to 0.90, the action was always error/quit,
nuclear@1 1829 * whereas in version 0.90 and later, the action for CRC errors in ancillary
nuclear@1 1830 * chunks is warn/discard. These values should NOT be changed.
nuclear@1 1831 *
nuclear@1 1832 * value action:critical action:ancillary
nuclear@1 1833 */
nuclear@1 1834 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
nuclear@1 1835 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
nuclear@1 1836 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
nuclear@1 1837 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
nuclear@1 1838 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
nuclear@1 1839 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
nuclear@1 1840
nuclear@1 1841 /* These functions give the user control over the scan-line filtering in
nuclear@1 1842 * libpng and the compression methods used by zlib. These functions are
nuclear@1 1843 * mainly useful for testing, as the defaults should work with most users.
nuclear@1 1844 * Those users who are tight on memory or want faster performance at the
nuclear@1 1845 * expense of compression can modify them. See the compression library
nuclear@1 1846 * header file (zlib.h) for an explination of the compression functions.
nuclear@1 1847 */
nuclear@1 1848
nuclear@1 1849 /* set the filtering method(s) used by libpng. Currently, the only valid
nuclear@1 1850 * value for "method" is 0.
nuclear@1 1851 */
nuclear@1 1852 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
nuclear@1 1853 int filters));
nuclear@1 1854
nuclear@1 1855 /* Flags for png_set_filter() to say which filters to use. The flags
nuclear@1 1856 * are chosen so that they don't conflict with real filter types
nuclear@1 1857 * below, in case they are supplied instead of the #defined constants.
nuclear@1 1858 * These values should NOT be changed.
nuclear@1 1859 */
nuclear@1 1860 #define PNG_NO_FILTERS 0x00
nuclear@1 1861 #define PNG_FILTER_NONE 0x08
nuclear@1 1862 #define PNG_FILTER_SUB 0x10
nuclear@1 1863 #define PNG_FILTER_UP 0x20
nuclear@1 1864 #define PNG_FILTER_AVG 0x40
nuclear@1 1865 #define PNG_FILTER_PAETH 0x80
nuclear@1 1866 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
nuclear@1 1867 PNG_FILTER_AVG | PNG_FILTER_PAETH)
nuclear@1 1868
nuclear@1 1869 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
nuclear@1 1870 * These defines should NOT be changed.
nuclear@1 1871 */
nuclear@1 1872 #define PNG_FILTER_VALUE_NONE 0
nuclear@1 1873 #define PNG_FILTER_VALUE_SUB 1
nuclear@1 1874 #define PNG_FILTER_VALUE_UP 2
nuclear@1 1875 #define PNG_FILTER_VALUE_AVG 3
nuclear@1 1876 #define PNG_FILTER_VALUE_PAETH 4
nuclear@1 1877 #define PNG_FILTER_VALUE_LAST 5
nuclear@1 1878
nuclear@1 1879 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
nuclear@1 1880 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
nuclear@1 1881 * defines, either the default (minimum-sum-of-absolute-differences), or
nuclear@1 1882 * the experimental method (weighted-minimum-sum-of-absolute-differences).
nuclear@1 1883 *
nuclear@1 1884 * Weights are factors >= 1.0, indicating how important it is to keep the
nuclear@1 1885 * filter type consistent between rows. Larger numbers mean the current
nuclear@1 1886 * filter is that many times as likely to be the same as the "num_weights"
nuclear@1 1887 * previous filters. This is cumulative for each previous row with a weight.
nuclear@1 1888 * There needs to be "num_weights" values in "filter_weights", or it can be
nuclear@1 1889 * NULL if the weights aren't being specified. Weights have no influence on
nuclear@1 1890 * the selection of the first row filter. Well chosen weights can (in theory)
nuclear@1 1891 * improve the compression for a given image.
nuclear@1 1892 *
nuclear@1 1893 * Costs are factors >= 1.0 indicating the relative decoding costs of a
nuclear@1 1894 * filter type. Higher costs indicate more decoding expense, and are
nuclear@1 1895 * therefore less likely to be selected over a filter with lower computational
nuclear@1 1896 * costs. There needs to be a value in "filter_costs" for each valid filter
nuclear@1 1897 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
nuclear@1 1898 * setting the costs. Costs try to improve the speed of decompression without
nuclear@1 1899 * unduly increasing the compressed image size.
nuclear@1 1900 *
nuclear@1 1901 * A negative weight or cost indicates the default value is to be used, and
nuclear@1 1902 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
nuclear@1 1903 * The default values for both weights and costs are currently 1.0, but may
nuclear@1 1904 * change if good general weighting/cost heuristics can be found. If both
nuclear@1 1905 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
nuclear@1 1906 * to the UNWEIGHTED method, but with added encoding time/computation.
nuclear@1 1907 */
nuclear@1 1908 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 1909 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
nuclear@1 1910 int heuristic_method, int num_weights, png_doublep filter_weights,
nuclear@1 1911 png_doublep filter_costs));
nuclear@1 1912 #endif
nuclear@1 1913 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@1 1914
nuclear@1 1915 /* Heuristic used for row filter selection. These defines should NOT be
nuclear@1 1916 * changed.
nuclear@1 1917 */
nuclear@1 1918 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
nuclear@1 1919 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
nuclear@1 1920 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
nuclear@1 1921 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
nuclear@1 1922
nuclear@1 1923 /* Set the library compression level. Currently, valid values range from
nuclear@1 1924 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
nuclear@1 1925 * (0 - no compression, 9 - "maximal" compression). Note that tests have
nuclear@1 1926 * shown that zlib compression levels 3-6 usually perform as well as level 9
nuclear@1 1927 * for PNG images, and do considerably fewer caclulations. In the future,
nuclear@1 1928 * these values may not correspond directly to the zlib compression levels.
nuclear@1 1929 */
nuclear@1 1930 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
nuclear@1 1931 int level));
nuclear@1 1932
nuclear@1 1933 extern PNG_EXPORT(void,png_set_compression_mem_level)
nuclear@1 1934 PNGARG((png_structp png_ptr, int mem_level));
nuclear@1 1935
nuclear@1 1936 extern PNG_EXPORT(void,png_set_compression_strategy)
nuclear@1 1937 PNGARG((png_structp png_ptr, int strategy));
nuclear@1 1938
nuclear@1 1939 extern PNG_EXPORT(void,png_set_compression_window_bits)
nuclear@1 1940 PNGARG((png_structp png_ptr, int window_bits));
nuclear@1 1941
nuclear@1 1942 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
nuclear@1 1943 int method));
nuclear@1 1944
nuclear@1 1945 /* These next functions are called for input/output, memory, and error
nuclear@1 1946 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
nuclear@1 1947 * and call standard C I/O routines such as fread(), fwrite(), and
nuclear@1 1948 * fprintf(). These functions can be made to use other I/O routines
nuclear@1 1949 * at run time for those applications that need to handle I/O in a
nuclear@1 1950 * different manner by calling png_set_???_fn(). See libpng.txt for
nuclear@1 1951 * more information.
nuclear@1 1952 */
nuclear@1 1953
nuclear@1 1954 #if !defined(PNG_NO_STDIO)
nuclear@1 1955 /* Initialize the input/output for the PNG file to the default functions. */
nuclear@1 1956 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
nuclear@1 1957 #endif
nuclear@1 1958
nuclear@1 1959 /* Replace the (error and abort), and warning functions with user
nuclear@1 1960 * supplied functions. If no messages are to be printed you must still
nuclear@1 1961 * write and use replacement functions. The replacement error_fn should
nuclear@1 1962 * still do a longjmp to the last setjmp location if you are using this
nuclear@1 1963 * method of error handling. If error_fn or warning_fn is NULL, the
nuclear@1 1964 * default function will be used.
nuclear@1 1965 */
nuclear@1 1966
nuclear@1 1967 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
nuclear@1 1968 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
nuclear@1 1969
nuclear@1 1970 /* Return the user pointer associated with the error functions */
nuclear@1 1971 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
nuclear@1 1972
nuclear@1 1973 /* Replace the default data output functions with a user supplied one(s).
nuclear@1 1974 * If buffered output is not used, then output_flush_fn can be set to NULL.
nuclear@1 1975 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
nuclear@1 1976 * output_flush_fn will be ignored (and thus can be NULL).
nuclear@1 1977 */
nuclear@1 1978 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
nuclear@1 1979 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
nuclear@1 1980
nuclear@1 1981 /* Replace the default data input function with a user supplied one. */
nuclear@1 1982 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
nuclear@1 1983 png_voidp io_ptr, png_rw_ptr read_data_fn));
nuclear@1 1984
nuclear@1 1985 /* Return the user pointer associated with the I/O functions */
nuclear@1 1986 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
nuclear@1 1987
nuclear@1 1988 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
nuclear@1 1989 png_read_status_ptr read_row_fn));
nuclear@1 1990
nuclear@1 1991 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
nuclear@1 1992 png_write_status_ptr write_row_fn));
nuclear@1 1993
nuclear@1 1994 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 1995 /* Replace the default memory allocation functions with user supplied one(s). */
nuclear@1 1996 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
nuclear@1 1997 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@1 1998 /* Return the user pointer associated with the memory functions */
nuclear@1 1999 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
nuclear@1 2000 #endif
nuclear@1 2001
nuclear@1 2002 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 2003 defined(PNG_LEGACY_SUPPORTED)
nuclear@1 2004 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
nuclear@1 2005 png_ptr, png_user_transform_ptr read_user_transform_fn));
nuclear@1 2006 #endif
nuclear@1 2007
nuclear@1 2008 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 2009 defined(PNG_LEGACY_SUPPORTED)
nuclear@1 2010 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
nuclear@1 2011 png_ptr, png_user_transform_ptr write_user_transform_fn));
nuclear@1 2012 #endif
nuclear@1 2013
nuclear@1 2014 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 2015 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@1 2016 defined(PNG_LEGACY_SUPPORTED)
nuclear@1 2017 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
nuclear@1 2018 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
nuclear@1 2019 int user_transform_channels));
nuclear@1 2020 /* Return the user pointer associated with the user transform functions */
nuclear@1 2021 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
nuclear@1 2022 PNGARG((png_structp png_ptr));
nuclear@1 2023 #endif
nuclear@1 2024
nuclear@1 2025 #ifdef PNG_USER_CHUNKS_SUPPORTED
nuclear@1 2026 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
nuclear@1 2027 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
nuclear@1 2028 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
nuclear@1 2029 png_ptr));
nuclear@1 2030 #endif
nuclear@1 2031
nuclear@1 2032 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 2033 /* Sets the function callbacks for the push reader, and a pointer to a
nuclear@1 2034 * user-defined structure available to the callback functions.
nuclear@1 2035 */
nuclear@1 2036 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
nuclear@1 2037 png_voidp progressive_ptr,
nuclear@1 2038 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@1 2039 png_progressive_end_ptr end_fn));
nuclear@1 2040
nuclear@1 2041 /* returns the user pointer associated with the push read functions */
nuclear@1 2042 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
nuclear@1 2043 PNGARG((png_structp png_ptr));
nuclear@1 2044
nuclear@1 2045 /* function to be called when data becomes available */
nuclear@1 2046 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
nuclear@1 2047 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
nuclear@1 2048
nuclear@1 2049 /* function that combines rows. Not very much different than the
nuclear@1 2050 * png_combine_row() call. Is this even used?????
nuclear@1 2051 */
nuclear@1 2052 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
nuclear@1 2053 png_bytep old_row, png_bytep new_row));
nuclear@1 2054 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@1 2055
nuclear@1 2056 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
nuclear@1 2057 png_uint_32 size));
nuclear@1 2058
nuclear@1 2059 #if defined(PNG_1_0_X)
nuclear@1 2060 # define png_malloc_warn png_malloc
nuclear@1 2061 #else
nuclear@1 2062 /* Added at libpng version 1.2.4 */
nuclear@1 2063 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
nuclear@1 2064 png_uint_32 size));
nuclear@1 2065 #endif
nuclear@1 2066
nuclear@1 2067 /* frees a pointer allocated by png_malloc() */
nuclear@1 2068 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
nuclear@1 2069
nuclear@1 2070 #if defined(PNG_1_0_X)
nuclear@1 2071 /* Function to allocate memory for zlib. */
nuclear@1 2072 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
nuclear@1 2073 uInt size));
nuclear@1 2074
nuclear@1 2075 /* Function to free memory for zlib */
nuclear@1 2076 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@1 2077 #endif
nuclear@1 2078
nuclear@1 2079 /* Free data that was allocated internally */
nuclear@1 2080 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
nuclear@1 2081 png_infop info_ptr, png_uint_32 free_me, int num));
nuclear@1 2082 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@1 2083 /* Reassign responsibility for freeing existing data, whether allocated
nuclear@1 2084 * by libpng or by the application */
nuclear@1 2085 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
nuclear@1 2086 png_infop info_ptr, int freer, png_uint_32 mask));
nuclear@1 2087 #endif
nuclear@1 2088 /* assignments for png_data_freer */
nuclear@1 2089 #define PNG_DESTROY_WILL_FREE_DATA 1
nuclear@1 2090 #define PNG_SET_WILL_FREE_DATA 1
nuclear@1 2091 #define PNG_USER_WILL_FREE_DATA 2
nuclear@1 2092 /* Flags for png_ptr->free_me and info_ptr->free_me */
nuclear@1 2093 #define PNG_FREE_HIST 0x0008
nuclear@1 2094 #define PNG_FREE_ICCP 0x0010
nuclear@1 2095 #define PNG_FREE_SPLT 0x0020
nuclear@1 2096 #define PNG_FREE_ROWS 0x0040
nuclear@1 2097 #define PNG_FREE_PCAL 0x0080
nuclear@1 2098 #define PNG_FREE_SCAL 0x0100
nuclear@1 2099 #define PNG_FREE_UNKN 0x0200
nuclear@1 2100 #define PNG_FREE_LIST 0x0400
nuclear@1 2101 #define PNG_FREE_PLTE 0x1000
nuclear@1 2102 #define PNG_FREE_TRNS 0x2000
nuclear@1 2103 #define PNG_FREE_TEXT 0x4000
nuclear@1 2104 #define PNG_FREE_ALL 0x7fff
nuclear@1 2105 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
nuclear@1 2106
nuclear@1 2107 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@1 2108 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
nuclear@1 2109 png_uint_32 size));
nuclear@1 2110 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
nuclear@1 2111 png_voidp ptr));
nuclear@1 2112 #endif
nuclear@1 2113
nuclear@1 2114 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
nuclear@1 2115 png_voidp s1, png_voidp s2, png_uint_32 size));
nuclear@1 2116
nuclear@1 2117 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
nuclear@1 2118 png_voidp s1, int value, png_uint_32 size));
nuclear@1 2119
nuclear@1 2120 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
nuclear@1 2121 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
nuclear@1 2122 int check));
nuclear@1 2123 #endif /* USE_FAR_KEYWORD */
nuclear@1 2124
nuclear@1 2125 #ifndef PNG_NO_ERROR_TEXT
nuclear@1 2126 /* Fatal error in PNG image of libpng - can't continue */
nuclear@1 2127 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
nuclear@1 2128 png_const_charp error_message));
nuclear@1 2129
nuclear@1 2130 /* The same, but the chunk name is prepended to the error string. */
nuclear@1 2131 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
nuclear@1 2132 png_const_charp error_message));
nuclear@1 2133 #else
nuclear@1 2134 /* Fatal error in PNG image of libpng - can't continue */
nuclear@1 2135 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
nuclear@1 2136 #endif
nuclear@1 2137
nuclear@1 2138 #ifndef PNG_NO_WARNINGS
nuclear@1 2139 /* Non-fatal error in libpng. Can continue, but may have a problem. */
nuclear@1 2140 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
nuclear@1 2141 png_const_charp warning_message));
nuclear@1 2142
nuclear@1 2143 #ifdef PNG_READ_SUPPORTED
nuclear@1 2144 /* Non-fatal error in libpng, chunk name is prepended to message. */
nuclear@1 2145 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
nuclear@1 2146 png_const_charp warning_message));
nuclear@1 2147 #endif /* PNG_READ_SUPPORTED */
nuclear@1 2148 #endif /* PNG_NO_WARNINGS */
nuclear@1 2149
nuclear@1 2150 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
nuclear@1 2151 * Similarly, the png_get_<chunk> calls are used to read values from the
nuclear@1 2152 * png_info_struct, either storing the parameters in the passed variables, or
nuclear@1 2153 * setting pointers into the png_info_struct where the data is stored. The
nuclear@1 2154 * png_get_<chunk> functions return a non-zero value if the data was available
nuclear@1 2155 * in info_ptr, or return zero and do not change any of the parameters if the
nuclear@1 2156 * data was not available.
nuclear@1 2157 *
nuclear@1 2158 * These functions should be used instead of directly accessing png_info
nuclear@1 2159 * to avoid problems with future changes in the size and internal layout of
nuclear@1 2160 * png_info_struct.
nuclear@1 2161 */
nuclear@1 2162 /* Returns "flag" if chunk data is valid in info_ptr. */
nuclear@1 2163 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
nuclear@1 2164 png_infop info_ptr, png_uint_32 flag));
nuclear@1 2165
nuclear@1 2166 /* Returns number of bytes needed to hold a transformed row. */
nuclear@1 2167 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
nuclear@1 2168 png_infop info_ptr));
nuclear@1 2169
nuclear@1 2170 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@1 2171 /* Returns row_pointers, which is an array of pointers to scanlines that was
nuclear@1 2172 returned from png_read_png(). */
nuclear@1 2173 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
nuclear@1 2174 png_infop info_ptr));
nuclear@1 2175 /* Set row_pointers, which is an array of pointers to scanlines for use
nuclear@1 2176 by png_write_png(). */
nuclear@1 2177 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
nuclear@1 2178 png_infop info_ptr, png_bytepp row_pointers));
nuclear@1 2179 #endif
nuclear@1 2180
nuclear@1 2181 /* Returns number of color channels in image. */
nuclear@1 2182 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
nuclear@1 2183 png_infop info_ptr));
nuclear@1 2184
nuclear@1 2185 #ifdef PNG_EASY_ACCESS_SUPPORTED
nuclear@1 2186 /* Returns image width in pixels. */
nuclear@1 2187 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
nuclear@1 2188 png_ptr, png_infop info_ptr));
nuclear@1 2189
nuclear@1 2190 /* Returns image height in pixels. */
nuclear@1 2191 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
nuclear@1 2192 png_ptr, png_infop info_ptr));
nuclear@1 2193
nuclear@1 2194 /* Returns image bit_depth. */
nuclear@1 2195 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
nuclear@1 2196 png_ptr, png_infop info_ptr));
nuclear@1 2197
nuclear@1 2198 /* Returns image color_type. */
nuclear@1 2199 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
nuclear@1 2200 png_ptr, png_infop info_ptr));
nuclear@1 2201
nuclear@1 2202 /* Returns image filter_type. */
nuclear@1 2203 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
nuclear@1 2204 png_ptr, png_infop info_ptr));
nuclear@1 2205
nuclear@1 2206 /* Returns image interlace_type. */
nuclear@1 2207 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
nuclear@1 2208 png_ptr, png_infop info_ptr));
nuclear@1 2209
nuclear@1 2210 /* Returns image compression_type. */
nuclear@1 2211 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
nuclear@1 2212 png_ptr, png_infop info_ptr));
nuclear@1 2213
nuclear@1 2214 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
nuclear@1 2215 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
nuclear@1 2216 png_ptr, png_infop info_ptr));
nuclear@1 2217 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
nuclear@1 2218 png_ptr, png_infop info_ptr));
nuclear@1 2219 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
nuclear@1 2220 png_ptr, png_infop info_ptr));
nuclear@1 2221
nuclear@1 2222 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
nuclear@1 2223 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2224 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
nuclear@1 2225 png_ptr, png_infop info_ptr));
nuclear@1 2226 #endif
nuclear@1 2227
nuclear@1 2228 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
nuclear@1 2229 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
nuclear@1 2230 png_ptr, png_infop info_ptr));
nuclear@1 2231 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
nuclear@1 2232 png_ptr, png_infop info_ptr));
nuclear@1 2233 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
nuclear@1 2234 png_ptr, png_infop info_ptr));
nuclear@1 2235 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
nuclear@1 2236 png_ptr, png_infop info_ptr));
nuclear@1 2237
nuclear@1 2238 #endif /* PNG_EASY_ACCESS_SUPPORTED */
nuclear@1 2239
nuclear@1 2240 /* Returns pointer to signature string read from PNG header */
nuclear@1 2241 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
nuclear@1 2242 png_infop info_ptr));
nuclear@1 2243
nuclear@1 2244 #if defined(PNG_bKGD_SUPPORTED)
nuclear@1 2245 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
nuclear@1 2246 png_infop info_ptr, png_color_16p *background));
nuclear@1 2247 #endif
nuclear@1 2248
nuclear@1 2249 #if defined(PNG_bKGD_SUPPORTED)
nuclear@1 2250 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
nuclear@1 2251 png_infop info_ptr, png_color_16p background));
nuclear@1 2252 #endif
nuclear@1 2253
nuclear@1 2254 #if defined(PNG_cHRM_SUPPORTED)
nuclear@1 2255 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2256 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
nuclear@1 2257 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
nuclear@1 2258 double *red_y, double *green_x, double *green_y, double *blue_x,
nuclear@1 2259 double *blue_y));
nuclear@1 2260 #endif
nuclear@1 2261 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 2262 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@1 2263 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
nuclear@1 2264 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
nuclear@1 2265 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
nuclear@1 2266 *int_blue_x, png_fixed_point *int_blue_y));
nuclear@1 2267 #endif
nuclear@1 2268 #endif
nuclear@1 2269
nuclear@1 2270 #if defined(PNG_cHRM_SUPPORTED)
nuclear@1 2271 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2272 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
nuclear@1 2273 png_infop info_ptr, double white_x, double white_y, double red_x,
nuclear@1 2274 double red_y, double green_x, double green_y, double blue_x, double blue_y));
nuclear@1 2275 #endif
nuclear@1 2276 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 2277 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@1 2278 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@1 2279 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@1 2280 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@1 2281 png_fixed_point int_blue_y));
nuclear@1 2282 #endif
nuclear@1 2283 #endif
nuclear@1 2284
nuclear@1 2285 #if defined(PNG_gAMA_SUPPORTED)
nuclear@1 2286 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2287 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
nuclear@1 2288 png_infop info_ptr, double *file_gamma));
nuclear@1 2289 #endif
nuclear@1 2290 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@1 2291 png_infop info_ptr, png_fixed_point *int_file_gamma));
nuclear@1 2292 #endif
nuclear@1 2293
nuclear@1 2294 #if defined(PNG_gAMA_SUPPORTED)
nuclear@1 2295 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2296 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
nuclear@1 2297 png_infop info_ptr, double file_gamma));
nuclear@1 2298 #endif
nuclear@1 2299 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@1 2300 png_infop info_ptr, png_fixed_point int_file_gamma));
nuclear@1 2301 #endif
nuclear@1 2302
nuclear@1 2303 #if defined(PNG_hIST_SUPPORTED)
nuclear@1 2304 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
nuclear@1 2305 png_infop info_ptr, png_uint_16p *hist));
nuclear@1 2306 #endif
nuclear@1 2307
nuclear@1 2308 #if defined(PNG_hIST_SUPPORTED)
nuclear@1 2309 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
nuclear@1 2310 png_infop info_ptr, png_uint_16p hist));
nuclear@1 2311 #endif
nuclear@1 2312
nuclear@1 2313 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
nuclear@1 2314 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
nuclear@1 2315 int *bit_depth, int *color_type, int *interlace_method,
nuclear@1 2316 int *compression_method, int *filter_method));
nuclear@1 2317
nuclear@1 2318 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
nuclear@1 2319 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
nuclear@1 2320 int color_type, int interlace_method, int compression_method,
nuclear@1 2321 int filter_method));
nuclear@1 2322
nuclear@1 2323 #if defined(PNG_oFFs_SUPPORTED)
nuclear@1 2324 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
nuclear@1 2325 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
nuclear@1 2326 int *unit_type));
nuclear@1 2327 #endif
nuclear@1 2328
nuclear@1 2329 #if defined(PNG_oFFs_SUPPORTED)
nuclear@1 2330 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
nuclear@1 2331 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
nuclear@1 2332 int unit_type));
nuclear@1 2333 #endif
nuclear@1 2334
nuclear@1 2335 #if defined(PNG_pCAL_SUPPORTED)
nuclear@1 2336 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
nuclear@1 2337 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
nuclear@1 2338 int *type, int *nparams, png_charp *units, png_charpp *params));
nuclear@1 2339 #endif
nuclear@1 2340
nuclear@1 2341 #if defined(PNG_pCAL_SUPPORTED)
nuclear@1 2342 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
nuclear@1 2343 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
nuclear@1 2344 int type, int nparams, png_charp units, png_charpp params));
nuclear@1 2345 #endif
nuclear@1 2346
nuclear@1 2347 #if defined(PNG_pHYs_SUPPORTED)
nuclear@1 2348 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
nuclear@1 2349 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@1 2350 #endif
nuclear@1 2351
nuclear@1 2352 #if defined(PNG_pHYs_SUPPORTED)
nuclear@1 2353 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
nuclear@1 2354 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
nuclear@1 2355 #endif
nuclear@1 2356
nuclear@1 2357 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
nuclear@1 2358 png_infop info_ptr, png_colorp *palette, int *num_palette));
nuclear@1 2359
nuclear@1 2360 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
nuclear@1 2361 png_infop info_ptr, png_colorp palette, int num_palette));
nuclear@1 2362
nuclear@1 2363 #if defined(PNG_sBIT_SUPPORTED)
nuclear@1 2364 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
nuclear@1 2365 png_infop info_ptr, png_color_8p *sig_bit));
nuclear@1 2366 #endif
nuclear@1 2367
nuclear@1 2368 #if defined(PNG_sBIT_SUPPORTED)
nuclear@1 2369 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
nuclear@1 2370 png_infop info_ptr, png_color_8p sig_bit));
nuclear@1 2371 #endif
nuclear@1 2372
nuclear@1 2373 #if defined(PNG_sRGB_SUPPORTED)
nuclear@1 2374 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
nuclear@1 2375 png_infop info_ptr, int *intent));
nuclear@1 2376 #endif
nuclear@1 2377
nuclear@1 2378 #if defined(PNG_sRGB_SUPPORTED)
nuclear@1 2379 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
nuclear@1 2380 png_infop info_ptr, int intent));
nuclear@1 2381 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
nuclear@1 2382 png_infop info_ptr, int intent));
nuclear@1 2383 #endif
nuclear@1 2384
nuclear@1 2385 #if defined(PNG_iCCP_SUPPORTED)
nuclear@1 2386 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
nuclear@1 2387 png_infop info_ptr, png_charpp name, int *compression_type,
nuclear@1 2388 png_charpp profile, png_uint_32 *proflen));
nuclear@1 2389 /* Note to maintainer: profile should be png_bytepp */
nuclear@1 2390 #endif
nuclear@1 2391
nuclear@1 2392 #if defined(PNG_iCCP_SUPPORTED)
nuclear@1 2393 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
nuclear@1 2394 png_infop info_ptr, png_charp name, int compression_type,
nuclear@1 2395 png_charp profile, png_uint_32 proflen));
nuclear@1 2396 /* Note to maintainer: profile should be png_bytep */
nuclear@1 2397 #endif
nuclear@1 2398
nuclear@1 2399 #if defined(PNG_sPLT_SUPPORTED)
nuclear@1 2400 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
nuclear@1 2401 png_infop info_ptr, png_sPLT_tpp entries));
nuclear@1 2402 #endif
nuclear@1 2403
nuclear@1 2404 #if defined(PNG_sPLT_SUPPORTED)
nuclear@1 2405 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
nuclear@1 2406 png_infop info_ptr, png_sPLT_tp entries, int nentries));
nuclear@1 2407 #endif
nuclear@1 2408
nuclear@1 2409 #if defined(PNG_TEXT_SUPPORTED)
nuclear@1 2410 /* png_get_text also returns the number of text chunks in *num_text */
nuclear@1 2411 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
nuclear@1 2412 png_infop info_ptr, png_textp *text_ptr, int *num_text));
nuclear@1 2413 #endif
nuclear@1 2414
nuclear@1 2415 /*
nuclear@1 2416 * Note while png_set_text() will accept a structure whose text,
nuclear@1 2417 * language, and translated keywords are NULL pointers, the structure
nuclear@1 2418 * returned by png_get_text will always contain regular
nuclear@1 2419 * zero-terminated C strings. They might be empty strings but
nuclear@1 2420 * they will never be NULL pointers.
nuclear@1 2421 */
nuclear@1 2422
nuclear@1 2423 #if defined(PNG_TEXT_SUPPORTED)
nuclear@1 2424 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
nuclear@1 2425 png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@1 2426 #endif
nuclear@1 2427
nuclear@1 2428 #if defined(PNG_tIME_SUPPORTED)
nuclear@1 2429 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
nuclear@1 2430 png_infop info_ptr, png_timep *mod_time));
nuclear@1 2431 #endif
nuclear@1 2432
nuclear@1 2433 #if defined(PNG_tIME_SUPPORTED)
nuclear@1 2434 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
nuclear@1 2435 png_infop info_ptr, png_timep mod_time));
nuclear@1 2436 #endif
nuclear@1 2437
nuclear@1 2438 #if defined(PNG_tRNS_SUPPORTED)
nuclear@1 2439 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
nuclear@1 2440 png_infop info_ptr, png_bytep *trans, int *num_trans,
nuclear@1 2441 png_color_16p *trans_values));
nuclear@1 2442 #endif
nuclear@1 2443
nuclear@1 2444 #if defined(PNG_tRNS_SUPPORTED)
nuclear@1 2445 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
nuclear@1 2446 png_infop info_ptr, png_bytep trans, int num_trans,
nuclear@1 2447 png_color_16p trans_values));
nuclear@1 2448 #endif
nuclear@1 2449
nuclear@1 2450 #if defined(PNG_tRNS_SUPPORTED)
nuclear@1 2451 #endif
nuclear@1 2452
nuclear@1 2453 #if defined(PNG_sCAL_SUPPORTED)
nuclear@1 2454 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2455 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
nuclear@1 2456 png_infop info_ptr, int *unit, double *width, double *height));
nuclear@1 2457 #else
nuclear@1 2458 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 2459 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@1 2460 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
nuclear@1 2461 #endif
nuclear@1 2462 #endif
nuclear@1 2463 #endif /* PNG_sCAL_SUPPORTED */
nuclear@1 2464
nuclear@1 2465 #if defined(PNG_sCAL_SUPPORTED)
nuclear@1 2466 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 2467 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
nuclear@1 2468 png_infop info_ptr, int unit, double width, double height));
nuclear@1 2469 #else
nuclear@1 2470 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 2471 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@1 2472 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
nuclear@1 2473 #endif
nuclear@1 2474 #endif
nuclear@1 2475 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
nuclear@1 2476
nuclear@1 2477 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@1 2478 /* provide a list of chunks and how they are to be handled, if the built-in
nuclear@1 2479 handling or default unknown chunk handling is not desired. Any chunks not
nuclear@1 2480 listed will be handled in the default manner. The IHDR and IEND chunks
nuclear@1 2481 must not be listed.
nuclear@1 2482 keep = 0: follow default behaviour
nuclear@1 2483 = 1: do not keep
nuclear@1 2484 = 2: keep only if safe-to-copy
nuclear@1 2485 = 3: keep even if unsafe-to-copy
nuclear@1 2486 */
nuclear@1 2487 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
nuclear@1 2488 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
nuclear@1 2489 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
nuclear@1 2490 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
nuclear@1 2491 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
nuclear@1 2492 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
nuclear@1 2493 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
nuclear@1 2494 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
nuclear@1 2495 #endif
nuclear@1 2496 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@1 2497 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
nuclear@1 2498 chunk_name));
nuclear@1 2499 #endif
nuclear@1 2500
nuclear@1 2501 /* Png_free_data() will turn off the "valid" flag for anything it frees.
nuclear@1 2502 If you need to turn it off for a chunk that your application has freed,
nuclear@1 2503 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
nuclear@1 2504 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
nuclear@1 2505 png_infop info_ptr, int mask));
nuclear@1 2506
nuclear@1 2507 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@1 2508 /* The "params" pointer is currently not used and is for future expansion. */
nuclear@1 2509 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
nuclear@1 2510 png_infop info_ptr,
nuclear@1 2511 int transforms,
nuclear@1 2512 png_voidp params));
nuclear@1 2513 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
nuclear@1 2514 png_infop info_ptr,
nuclear@1 2515 int transforms,
nuclear@1 2516 png_voidp params));
nuclear@1 2517 #endif
nuclear@1 2518
nuclear@1 2519 /* Define PNG_DEBUG at compile time for debugging information. Higher
nuclear@1 2520 * numbers for PNG_DEBUG mean more debugging information. This has
nuclear@1 2521 * only been added since version 0.95 so it is not implemented throughout
nuclear@1 2522 * libpng yet, but more support will be added as needed.
nuclear@1 2523 */
nuclear@1 2524 #ifdef PNG_DEBUG
nuclear@1 2525 #if (PNG_DEBUG > 0)
nuclear@1 2526 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
nuclear@1 2527 #include <crtdbg.h>
nuclear@1 2528 #if (PNG_DEBUG > 1)
nuclear@1 2529 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
nuclear@1 2530 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
nuclear@1 2531 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
nuclear@1 2532 #endif
nuclear@1 2533 #else /* PNG_DEBUG_FILE || !_MSC_VER */
nuclear@1 2534 #ifndef PNG_DEBUG_FILE
nuclear@1 2535 #define PNG_DEBUG_FILE stderr
nuclear@1 2536 #endif /* PNG_DEBUG_FILE */
nuclear@1 2537 #if (PNG_DEBUG > 1)
nuclear@1 2538 #define png_debug(l,m) \
nuclear@1 2539 { \
nuclear@1 2540 int num_tabs=l; \
nuclear@1 2541 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@1 2542 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
nuclear@1 2543 }
nuclear@1 2544 #define png_debug1(l,m,p1) \
nuclear@1 2545 { \
nuclear@1 2546 int num_tabs=l; \
nuclear@1 2547 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@1 2548 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
nuclear@1 2549 }
nuclear@1 2550 #define png_debug2(l,m,p1,p2) \
nuclear@1 2551 { \
nuclear@1 2552 int num_tabs=l; \
nuclear@1 2553 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@1 2554 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
nuclear@1 2555 }
nuclear@1 2556 #endif /* (PNG_DEBUG > 1) */
nuclear@1 2557 #endif /* _MSC_VER */
nuclear@1 2558 #endif /* (PNG_DEBUG > 0) */
nuclear@1 2559 #endif /* PNG_DEBUG */
nuclear@1 2560 #ifndef png_debug
nuclear@1 2561 #define png_debug(l, m)
nuclear@1 2562 #endif
nuclear@1 2563 #ifndef png_debug1
nuclear@1 2564 #define png_debug1(l, m, p1)
nuclear@1 2565 #endif
nuclear@1 2566 #ifndef png_debug2
nuclear@1 2567 #define png_debug2(l, m, p1, p2)
nuclear@1 2568 #endif
nuclear@1 2569
nuclear@1 2570 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
nuclear@1 2571 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
nuclear@1 2572 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
nuclear@1 2573 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
nuclear@1 2574
nuclear@1 2575 #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@1 2576 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
nuclear@1 2577 png_ptr, png_uint_32 mng_features_permitted));
nuclear@1 2578 #endif
nuclear@1 2579
nuclear@1 2580 /* For use in png_set_keep_unknown, added to version 1.2.6 */
nuclear@1 2581 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
nuclear@1 2582 #define PNG_HANDLE_CHUNK_NEVER 1
nuclear@1 2583 #define PNG_HANDLE_CHUNK_IF_SAFE 2
nuclear@1 2584 #define PNG_HANDLE_CHUNK_ALWAYS 3
nuclear@1 2585
nuclear@1 2586 /* Added to version 1.2.0 */
nuclear@1 2587 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@1 2588 #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@1 2589 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
nuclear@1 2590 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
nuclear@1 2591 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
nuclear@1 2592 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
nuclear@1 2593 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
nuclear@1 2594 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
nuclear@1 2595 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
nuclear@1 2596 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
nuclear@1 2597 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
nuclear@1 2598
nuclear@1 2599 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
nuclear@1 2600 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
nuclear@1 2601 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
nuclear@1 2602 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
nuclear@1 2603 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
nuclear@1 2604 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
nuclear@1 2605 #define PNG_MMX_WRITE_FLAGS ( 0 )
nuclear@1 2606
nuclear@1 2607 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
nuclear@1 2608 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
nuclear@1 2609 | PNG_MMX_READ_FLAGS \
nuclear@1 2610 | PNG_MMX_WRITE_FLAGS )
nuclear@1 2611
nuclear@1 2612 #define PNG_SELECT_READ 1
nuclear@1 2613 #define PNG_SELECT_WRITE 2
nuclear@1 2614 #endif /* PNG_MMX_CODE_SUPPORTED */
nuclear@1 2615
nuclear@1 2616 #if !defined(PNG_1_0_X)
nuclear@1 2617 /* pngget.c */
nuclear@1 2618 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
nuclear@1 2619 PNGARG((int flag_select, int *compilerID));
nuclear@1 2620
nuclear@1 2621 /* pngget.c */
nuclear@1 2622 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
nuclear@1 2623 PNGARG((int flag_select));
nuclear@1 2624
nuclear@1 2625 /* pngget.c */
nuclear@1 2626 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
nuclear@1 2627 PNGARG((png_structp png_ptr));
nuclear@1 2628
nuclear@1 2629 /* pngget.c */
nuclear@1 2630 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
nuclear@1 2631 PNGARG((png_structp png_ptr));
nuclear@1 2632
nuclear@1 2633 /* pngget.c */
nuclear@1 2634 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
nuclear@1 2635 PNGARG((png_structp png_ptr));
nuclear@1 2636
nuclear@1 2637 /* pngset.c */
nuclear@1 2638 extern PNG_EXPORT(void,png_set_asm_flags)
nuclear@1 2639 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
nuclear@1 2640
nuclear@1 2641 /* pngset.c */
nuclear@1 2642 extern PNG_EXPORT(void,png_set_mmx_thresholds)
nuclear@1 2643 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
nuclear@1 2644 png_uint_32 mmx_rowbytes_threshold));
nuclear@1 2645
nuclear@1 2646 #endif /* PNG_1_0_X */
nuclear@1 2647
nuclear@1 2648 #if !defined(PNG_1_0_X)
nuclear@1 2649 /* png.c, pnggccrd.c, or pngvcrd.c */
nuclear@1 2650 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
nuclear@1 2651 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
nuclear@1 2652
nuclear@1 2653 /* Strip the prepended error numbers ("#nnn ") from error and warning
nuclear@1 2654 * messages before passing them to the error or warning handler. */
nuclear@1 2655 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@1 2656 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
nuclear@1 2657 png_ptr, png_uint_32 strip_mode));
nuclear@1 2658 #endif
nuclear@1 2659
nuclear@1 2660 #endif /* PNG_1_0_X */
nuclear@1 2661
nuclear@1 2662 /* Added at libpng-1.2.6 */
nuclear@1 2663 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@1 2664 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
nuclear@1 2665 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
nuclear@1 2666 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
nuclear@1 2667 png_ptr));
nuclear@1 2668 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
nuclear@1 2669 png_ptr));
nuclear@1 2670 #endif
nuclear@1 2671
nuclear@1 2672
nuclear@1 2673 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
nuclear@1 2674
nuclear@1 2675 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
nuclear@1 2676 /* With these routines we avoid an integer divide, which will be slower on
nuclear@1 2677 * most machines. However, it does take more operations than the corresponding
nuclear@1 2678 * divide method, so it may be slower on a few RISC systems. There are two
nuclear@1 2679 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
nuclear@1 2680 *
nuclear@1 2681 * Note that the rounding factors are NOT supposed to be the same! 128 and
nuclear@1 2682 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
nuclear@1 2683 * standard method.
nuclear@1 2684 *
nuclear@1 2685 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
nuclear@1 2686 */
nuclear@1 2687
nuclear@1 2688 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
nuclear@1 2689
nuclear@1 2690 # define png_composite(composite, fg, alpha, bg) \
nuclear@1 2691 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
nuclear@1 2692 + (png_uint_16)(bg)*(png_uint_16)(255 - \
nuclear@1 2693 (png_uint_16)(alpha)) + (png_uint_16)128); \
nuclear@1 2694 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
nuclear@1 2695
nuclear@1 2696 # define png_composite_16(composite, fg, alpha, bg) \
nuclear@1 2697 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
nuclear@1 2698 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
nuclear@1 2699 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
nuclear@1 2700 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
nuclear@1 2701
nuclear@1 2702 #else /* standard method using integer division */
nuclear@1 2703
nuclear@1 2704 # define png_composite(composite, fg, alpha, bg) \
nuclear@1 2705 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
nuclear@1 2706 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
nuclear@1 2707 (png_uint_16)127) / 255)
nuclear@1 2708
nuclear@1 2709 # define png_composite_16(composite, fg, alpha, bg) \
nuclear@1 2710 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
nuclear@1 2711 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
nuclear@1 2712 (png_uint_32)32767) / (png_uint_32)65535L)
nuclear@1 2713
nuclear@1 2714 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
nuclear@1 2715
nuclear@1 2716 /* Inline macros to do direct reads of bytes from the input buffer. These
nuclear@1 2717 * require that you are using an architecture that uses PNG byte ordering
nuclear@1 2718 * (MSB first) and supports unaligned data storage. I think that PowerPC
nuclear@1 2719 * in big-endian mode and 680x0 are the only ones that will support this.
nuclear@1 2720 * The x86 line of processors definitely do not. The png_get_int_32()
nuclear@1 2721 * routine also assumes we are using two's complement format for negative
nuclear@1 2722 * values, which is almost certainly true.
nuclear@1 2723 */
nuclear@1 2724 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
nuclear@1 2725 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
nuclear@1 2726 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
nuclear@1 2727 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
nuclear@1 2728 #else
nuclear@1 2729 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
nuclear@1 2730 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
nuclear@1 2731 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
nuclear@1 2732 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
nuclear@1 2733 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
nuclear@1 2734 PNGARG((png_structp png_ptr, png_bytep buf));
nuclear@1 2735 /* No png_get_int_16 -- may be added if there's a real need for it. */
nuclear@1 2736
nuclear@1 2737 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
nuclear@1 2738 */
nuclear@1 2739 extern PNG_EXPORT(void,png_save_uint_32)
nuclear@1 2740 PNGARG((png_bytep buf, png_uint_32 i));
nuclear@1 2741 extern PNG_EXPORT(void,png_save_int_32)
nuclear@1 2742 PNGARG((png_bytep buf, png_int_32 i));
nuclear@1 2743
nuclear@1 2744 /* Place a 16-bit number into a buffer in PNG byte order.
nuclear@1 2745 * The parameter is declared unsigned int, not png_uint_16,
nuclear@1 2746 * just to avoid potential problems on pre-ANSI C compilers.
nuclear@1 2747 */
nuclear@1 2748 extern PNG_EXPORT(void,png_save_uint_16)
nuclear@1 2749 PNGARG((png_bytep buf, unsigned int i));
nuclear@1 2750 /* No png_save_int_16 -- may be added if there's a real need for it. */
nuclear@1 2751
nuclear@1 2752 /* ************************************************************************* */
nuclear@1 2753
nuclear@1 2754 /* These next functions are used internally in the code. They generally
nuclear@1 2755 * shouldn't be used unless you are writing code to add or replace some
nuclear@1 2756 * functionality in libpng. More information about most functions can
nuclear@1 2757 * be found in the files where the functions are located.
nuclear@1 2758 */
nuclear@1 2759
nuclear@1 2760
nuclear@1 2761 /* Various modes of operation, that are visible to applications because
nuclear@1 2762 * they are used for unknown chunk location.
nuclear@1 2763 */
nuclear@1 2764 #define PNG_HAVE_IHDR 0x01
nuclear@1 2765 #define PNG_HAVE_PLTE 0x02
nuclear@1 2766 #define PNG_HAVE_IDAT 0x04
nuclear@1 2767 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
nuclear@1 2768 #define PNG_HAVE_IEND 0x10
nuclear@1 2769
nuclear@1 2770 #if defined(PNG_INTERNAL)
nuclear@1 2771
nuclear@1 2772 /* More modes of operation. Note that after an init, mode is set to
nuclear@1 2773 * zero automatically when the structure is created.
nuclear@1 2774 */
nuclear@1 2775 #define PNG_HAVE_gAMA 0x20
nuclear@1 2776 #define PNG_HAVE_cHRM 0x40
nuclear@1 2777 #define PNG_HAVE_sRGB 0x80
nuclear@1 2778 #define PNG_HAVE_CHUNK_HEADER 0x100
nuclear@1 2779 #define PNG_WROTE_tIME 0x200
nuclear@1 2780 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
nuclear@1 2781 #define PNG_BACKGROUND_IS_GRAY 0x800
nuclear@1 2782 #define PNG_HAVE_PNG_SIGNATURE 0x1000
nuclear@1 2783 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
nuclear@1 2784
nuclear@1 2785 /* flags for the transformations the PNG library does on the image data */
nuclear@1 2786 #define PNG_BGR 0x0001
nuclear@1 2787 #define PNG_INTERLACE 0x0002
nuclear@1 2788 #define PNG_PACK 0x0004
nuclear@1 2789 #define PNG_SHIFT 0x0008
nuclear@1 2790 #define PNG_SWAP_BYTES 0x0010
nuclear@1 2791 #define PNG_INVERT_MONO 0x0020
nuclear@1 2792 #define PNG_DITHER 0x0040
nuclear@1 2793 #define PNG_BACKGROUND 0x0080
nuclear@1 2794 #define PNG_BACKGROUND_EXPAND 0x0100
nuclear@1 2795 /* 0x0200 unused */
nuclear@1 2796 #define PNG_16_TO_8 0x0400
nuclear@1 2797 #define PNG_RGBA 0x0800
nuclear@1 2798 #define PNG_EXPAND 0x1000
nuclear@1 2799 #define PNG_GAMMA 0x2000
nuclear@1 2800 #define PNG_GRAY_TO_RGB 0x4000
nuclear@1 2801 #define PNG_FILLER 0x8000L
nuclear@1 2802 #define PNG_PACKSWAP 0x10000L
nuclear@1 2803 #define PNG_SWAP_ALPHA 0x20000L
nuclear@1 2804 #define PNG_STRIP_ALPHA 0x40000L
nuclear@1 2805 #define PNG_INVERT_ALPHA 0x80000L
nuclear@1 2806 #define PNG_USER_TRANSFORM 0x100000L
nuclear@1 2807 #define PNG_RGB_TO_GRAY_ERR 0x200000L
nuclear@1 2808 #define PNG_RGB_TO_GRAY_WARN 0x400000L
nuclear@1 2809 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
nuclear@1 2810 /* 0x800000L Unused */
nuclear@1 2811 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
nuclear@1 2812 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
nuclear@1 2813 /* 0x4000000L unused */
nuclear@1 2814 /* 0x8000000L unused */
nuclear@1 2815 /* 0x10000000L unused */
nuclear@1 2816 /* 0x20000000L unused */
nuclear@1 2817 /* 0x40000000L unused */
nuclear@1 2818
nuclear@1 2819 /* flags for png_create_struct */
nuclear@1 2820 #define PNG_STRUCT_PNG 0x0001
nuclear@1 2821 #define PNG_STRUCT_INFO 0x0002
nuclear@1 2822
nuclear@1 2823 /* Scaling factor for filter heuristic weighting calculations */
nuclear@1 2824 #define PNG_WEIGHT_SHIFT 8
nuclear@1 2825 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
nuclear@1 2826 #define PNG_COST_SHIFT 3
nuclear@1 2827 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
nuclear@1 2828
nuclear@1 2829 /* flags for the png_ptr->flags rather than declaring a byte for each one */
nuclear@1 2830 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
nuclear@1 2831 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
nuclear@1 2832 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
nuclear@1 2833 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
nuclear@1 2834 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
nuclear@1 2835 #define PNG_FLAG_ZLIB_FINISHED 0x0020
nuclear@1 2836 #define PNG_FLAG_ROW_INIT 0x0040
nuclear@1 2837 #define PNG_FLAG_FILLER_AFTER 0x0080
nuclear@1 2838 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
nuclear@1 2839 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
nuclear@1 2840 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
nuclear@1 2841 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
nuclear@1 2842 #define PNG_FLAG_FREE_PLTE 0x1000
nuclear@1 2843 #define PNG_FLAG_FREE_TRNS 0x2000
nuclear@1 2844 #define PNG_FLAG_FREE_HIST 0x4000
nuclear@1 2845 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
nuclear@1 2846 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
nuclear@1 2847 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
nuclear@1 2848 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
nuclear@1 2849 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
nuclear@1 2850 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
nuclear@1 2851 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
nuclear@1 2852 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
nuclear@1 2853 /* 0x800000L unused */
nuclear@1 2854 /* 0x1000000L unused */
nuclear@1 2855 /* 0x2000000L unused */
nuclear@1 2856 /* 0x4000000L unused */
nuclear@1 2857 /* 0x8000000L unused */
nuclear@1 2858 /* 0x10000000L unused */
nuclear@1 2859 /* 0x20000000L unused */
nuclear@1 2860 /* 0x40000000L unused */
nuclear@1 2861
nuclear@1 2862 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
nuclear@1 2863 PNG_FLAG_CRC_ANCILLARY_NOWARN)
nuclear@1 2864
nuclear@1 2865 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
nuclear@1 2866 PNG_FLAG_CRC_CRITICAL_IGNORE)
nuclear@1 2867
nuclear@1 2868 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
nuclear@1 2869 PNG_FLAG_CRC_CRITICAL_MASK)
nuclear@1 2870
nuclear@1 2871 /* save typing and make code easier to understand */
nuclear@1 2872
nuclear@1 2873 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
nuclear@1 2874 abs((int)((c1).green) - (int)((c2).green)) + \
nuclear@1 2875 abs((int)((c1).blue) - (int)((c2).blue)))
nuclear@1 2876
nuclear@1 2877 /* Added to libpng-1.2.6 JB */
nuclear@1 2878 #define PNG_ROWBYTES(pixel_bits, width) \
nuclear@1 2879 ((pixel_bits) >= 8 ? \
nuclear@1 2880 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
nuclear@1 2881 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
nuclear@1 2882
nuclear@1 2883 /* PNG_OUT_OF_RANGE returns true if value is outside the range
nuclear@1 2884 ideal-delta..ideal+delta. Each argument is evaluated twice.
nuclear@1 2885 "ideal" and "delta" should be constants, normally simple
nuclear@1 2886 integers, "value" a variable. Added to libpng-1.2.6 JB */
nuclear@1 2887 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
nuclear@1 2888 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
nuclear@1 2889
nuclear@1 2890 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@1 2891 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@1 2892 /* place to hold the signature string for a PNG file. */
nuclear@1 2893 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@1 2894 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
nuclear@1 2895 #else
nuclear@1 2896 #endif
nuclear@1 2897 #endif /* PNG_NO_EXTERN */
nuclear@1 2898
nuclear@1 2899 /* Constant strings for known chunk types. If you need to add a chunk,
nuclear@1 2900 * define the name here, and add an invocation of the macro in png.c and
nuclear@1 2901 * wherever it's needed.
nuclear@1 2902 */
nuclear@1 2903 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
nuclear@1 2904 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
nuclear@1 2905 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
nuclear@1 2906 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
nuclear@1 2907 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
nuclear@1 2908 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
nuclear@1 2909 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
nuclear@1 2910 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
nuclear@1 2911 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
nuclear@1 2912 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
nuclear@1 2913 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
nuclear@1 2914 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
nuclear@1 2915 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
nuclear@1 2916 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
nuclear@1 2917 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
nuclear@1 2918 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
nuclear@1 2919 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
nuclear@1 2920 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
nuclear@1 2921 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
nuclear@1 2922 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
nuclear@1 2923 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
nuclear@1 2924
nuclear@1 2925 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@1 2926 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
nuclear@1 2927 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
nuclear@1 2928 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
nuclear@1 2929 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
nuclear@1 2930 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
nuclear@1 2931 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
nuclear@1 2932 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
nuclear@1 2933 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
nuclear@1 2934 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
nuclear@1 2935 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
nuclear@1 2936 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
nuclear@1 2937 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
nuclear@1 2938 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
nuclear@1 2939 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
nuclear@1 2940 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
nuclear@1 2941 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
nuclear@1 2942 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
nuclear@1 2943 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
nuclear@1 2944 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
nuclear@1 2945 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
nuclear@1 2946 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
nuclear@1 2947 #endif /* PNG_USE_GLOBAL_ARRAYS */
nuclear@1 2948
nuclear@1 2949 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 2950 /* Initialize png_ptr struct for reading, and allocate any other memory.
nuclear@1 2951 * (old interface - DEPRECATED - use png_create_read_struct instead).
nuclear@1 2952 */
nuclear@1 2953 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
nuclear@1 2954 #undef png_read_init
nuclear@1 2955 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
nuclear@1 2956 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
nuclear@1 2957 #endif
nuclear@1 2958
nuclear@1 2959 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@1 2960 png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@1 2961 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 2962 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
nuclear@1 2963 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@1 2964 png_info_size));
nuclear@1 2965 #endif
nuclear@1 2966
nuclear@1 2967 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@1 2968 /* Initialize png_ptr struct for writing, and allocate any other memory.
nuclear@1 2969 * (old interface - DEPRECATED - use png_create_write_struct instead).
nuclear@1 2970 */
nuclear@1 2971 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
nuclear@1 2972 #undef png_write_init
nuclear@1 2973 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
nuclear@1 2974 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
nuclear@1 2975 #endif
nuclear@1 2976
nuclear@1 2977 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@1 2978 png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@1 2979 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
nuclear@1 2980 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@1 2981 png_info_size));
nuclear@1 2982
nuclear@1 2983 /* Allocate memory for an internal libpng struct */
nuclear@1 2984 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
nuclear@1 2985
nuclear@1 2986 /* Free memory from internal libpng struct */
nuclear@1 2987 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
nuclear@1 2988
nuclear@1 2989 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
nuclear@1 2990 malloc_fn, png_voidp mem_ptr));
nuclear@1 2991 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
nuclear@1 2992 png_free_ptr free_fn, png_voidp mem_ptr));
nuclear@1 2993
nuclear@1 2994 /* Free any memory that info_ptr points to and reset struct. */
nuclear@1 2995 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
nuclear@1 2996 png_infop info_ptr));
nuclear@1 2997
nuclear@1 2998 #ifndef PNG_1_0_X
nuclear@1 2999 /* Function to allocate memory for zlib. */
nuclear@1 3000 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
nuclear@1 3001
nuclear@1 3002 /* Function to free memory for zlib */
nuclear@1 3003 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@1 3004
nuclear@1 3005 #ifdef PNG_SIZE_T
nuclear@1 3006 /* Function to convert a sizeof an item to png_sizeof item */
nuclear@1 3007 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
nuclear@1 3008 #endif
nuclear@1 3009
nuclear@1 3010 /* Next four functions are used internally as callbacks. PNGAPI is required
nuclear@1 3011 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
nuclear@1 3012
nuclear@1 3013 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
nuclear@1 3014 png_bytep data, png_size_t length));
nuclear@1 3015
nuclear@1 3016 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 3017 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@1 3018 png_bytep buffer, png_size_t length));
nuclear@1 3019 #endif
nuclear@1 3020
nuclear@1 3021 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
nuclear@1 3022 png_bytep data, png_size_t length));
nuclear@1 3023
nuclear@1 3024 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 3025 #if !defined(PNG_NO_STDIO)
nuclear@1 3026 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
nuclear@1 3027 #endif
nuclear@1 3028 #endif
nuclear@1 3029 #else /* PNG_1_0_X */
nuclear@1 3030 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 3031 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@1 3032 png_bytep buffer, png_size_t length));
nuclear@1 3033 #endif
nuclear@1 3034 #endif /* PNG_1_0_X */
nuclear@1 3035
nuclear@1 3036 /* Reset the CRC variable */
nuclear@1 3037 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
nuclear@1 3038
nuclear@1 3039 /* Write the "data" buffer to whatever output you are using. */
nuclear@1 3040 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@1 3041 png_size_t length));
nuclear@1 3042
nuclear@1 3043 /* Read data from whatever input you are using into the "data" buffer */
nuclear@1 3044 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@1 3045 png_size_t length));
nuclear@1 3046
nuclear@1 3047 /* Read bytes into buf, and update png_ptr->crc */
nuclear@1 3048 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
nuclear@1 3049 png_size_t length));
nuclear@1 3050
nuclear@1 3051 /* Decompress data in a chunk that uses compression */
nuclear@1 3052 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
nuclear@1 3053 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
nuclear@1 3054 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
nuclear@1 3055 int comp_type, png_size_t chunklength,
nuclear@1 3056 png_size_t prefix_length, png_size_t *data_length));
nuclear@1 3057 #endif
nuclear@1 3058
nuclear@1 3059 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
nuclear@1 3060 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
nuclear@1 3061
nuclear@1 3062 /* Read the CRC from the file and compare it to the libpng calculated CRC */
nuclear@1 3063 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
nuclear@1 3064
nuclear@1 3065 /* Calculate the CRC over a section of data. Note that we are only
nuclear@1 3066 * passing a maximum of 64K on systems that have this as a memory limit,
nuclear@1 3067 * since this is the maximum buffer size we can specify.
nuclear@1 3068 */
nuclear@1 3069 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
nuclear@1 3070 png_size_t length));
nuclear@1 3071
nuclear@1 3072 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@1 3073 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
nuclear@1 3074 #endif
nuclear@1 3075
nuclear@1 3076 /* simple function to write the signature */
nuclear@1 3077 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
nuclear@1 3078
nuclear@1 3079 /* write various chunks */
nuclear@1 3080
nuclear@1 3081 /* Write the IHDR chunk, and update the png_struct with the necessary
nuclear@1 3082 * information.
nuclear@1 3083 */
nuclear@1 3084 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
nuclear@1 3085 png_uint_32 height,
nuclear@1 3086 int bit_depth, int color_type, int compression_method, int filter_method,
nuclear@1 3087 int interlace_method));
nuclear@1 3088
nuclear@1 3089 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
nuclear@1 3090 png_uint_32 num_pal));
nuclear@1 3091
nuclear@1 3092 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
nuclear@1 3093 png_size_t length));
nuclear@1 3094
nuclear@1 3095 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
nuclear@1 3096
nuclear@1 3097 #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@1 3098 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 3099 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
nuclear@1 3100 #endif
nuclear@1 3101 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 3102 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
nuclear@1 3103 file_gamma));
nuclear@1 3104 #endif
nuclear@1 3105 #endif
nuclear@1 3106
nuclear@1 3107 #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@1 3108 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
nuclear@1 3109 int color_type));
nuclear@1 3110 #endif
nuclear@1 3111
nuclear@1 3112 #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@1 3113 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@1 3114 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
nuclear@1 3115 double white_x, double white_y,
nuclear@1 3116 double red_x, double red_y, double green_x, double green_y,
nuclear@1 3117 double blue_x, double blue_y));
nuclear@1 3118 #endif
nuclear@1 3119 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 3120 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
nuclear@1 3121 png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@1 3122 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@1 3123 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@1 3124 png_fixed_point int_blue_y));
nuclear@1 3125 #endif
nuclear@1 3126 #endif
nuclear@1 3127
nuclear@1 3128 #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@1 3129 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
nuclear@1 3130 int intent));
nuclear@1 3131 #endif
nuclear@1 3132
nuclear@1 3133 #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@1 3134 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
nuclear@1 3135 png_charp name, int compression_type,
nuclear@1 3136 png_charp profile, int proflen));
nuclear@1 3137 /* Note to maintainer: profile should be png_bytep */
nuclear@1 3138 #endif
nuclear@1 3139
nuclear@1 3140 #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@1 3141 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
nuclear@1 3142 png_sPLT_tp palette));
nuclear@1 3143 #endif
nuclear@1 3144
nuclear@1 3145 #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@1 3146 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
nuclear@1 3147 png_color_16p values, int number, int color_type));
nuclear@1 3148 #endif
nuclear@1 3149
nuclear@1 3150 #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@1 3151 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
nuclear@1 3152 png_color_16p values, int color_type));
nuclear@1 3153 #endif
nuclear@1 3154
nuclear@1 3155 #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@1 3156 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
nuclear@1 3157 int num_hist));
nuclear@1 3158 #endif
nuclear@1 3159
nuclear@1 3160 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
nuclear@1 3161 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@1 3162 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
nuclear@1 3163 png_charp key, png_charpp new_key));
nuclear@1 3164 #endif
nuclear@1 3165
nuclear@1 3166 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@1 3167 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@1 3168 png_charp text, png_size_t text_len));
nuclear@1 3169 #endif
nuclear@1 3170
nuclear@1 3171 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@1 3172 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@1 3173 png_charp text, png_size_t text_len, int compression));
nuclear@1 3174 #endif
nuclear@1 3175
nuclear@1 3176 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@1 3177 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
nuclear@1 3178 int compression, png_charp key, png_charp lang, png_charp lang_key,
nuclear@1 3179 png_charp text));
nuclear@1 3180 #endif
nuclear@1 3181
nuclear@1 3182 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
nuclear@1 3183 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
nuclear@1 3184 png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@1 3185 #endif
nuclear@1 3186
nuclear@1 3187 #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@1 3188 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
nuclear@1 3189 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
nuclear@1 3190 #endif
nuclear@1 3191
nuclear@1 3192 #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@1 3193 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
nuclear@1 3194 png_int_32 X0, png_int_32 X1, int type, int nparams,
nuclear@1 3195 png_charp units, png_charpp params));
nuclear@1 3196 #endif
nuclear@1 3197
nuclear@1 3198 #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@1 3199 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
nuclear@1 3200 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
nuclear@1 3201 int unit_type));
nuclear@1 3202 #endif
nuclear@1 3203
nuclear@1 3204 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@1 3205 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
nuclear@1 3206 png_timep mod_time));
nuclear@1 3207 #endif
nuclear@1 3208
nuclear@1 3209 #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@1 3210 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@1 3211 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
nuclear@1 3212 int unit, double width, double height));
nuclear@1 3213 #else
nuclear@1 3214 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@1 3215 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
nuclear@1 3216 int unit, png_charp width, png_charp height));
nuclear@1 3217 #endif
nuclear@1 3218 #endif
nuclear@1 3219 #endif
nuclear@1 3220
nuclear@1 3221 /* Called when finished processing a row of data */
nuclear@1 3222 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
nuclear@1 3223
nuclear@1 3224 /* Internal use only. Called before first row of data */
nuclear@1 3225 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
nuclear@1 3226
nuclear@1 3227 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 3228 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
nuclear@1 3229 #endif
nuclear@1 3230
nuclear@1 3231 /* combine a row of data, dealing with alpha, etc. if requested */
nuclear@1 3232 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
nuclear@1 3233 int mask));
nuclear@1 3234
nuclear@1 3235 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@1 3236 /* expand an interlaced row */
nuclear@1 3237 /* OLD pre-1.0.9 interface:
nuclear@1 3238 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
nuclear@1 3239 png_bytep row, int pass, png_uint_32 transformations));
nuclear@1 3240 */
nuclear@1 3241 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
nuclear@1 3242 #endif
nuclear@1 3243
nuclear@1 3244 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
nuclear@1 3245
nuclear@1 3246 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@1 3247 /* grab pixels out of a row for an interlaced pass */
nuclear@1 3248 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
nuclear@1 3249 png_bytep row, int pass));
nuclear@1 3250 #endif
nuclear@1 3251
nuclear@1 3252 /* unfilter a row */
nuclear@1 3253 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
nuclear@1 3254 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
nuclear@1 3255
nuclear@1 3256 /* Choose the best filter to use and filter the row data */
nuclear@1 3257 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
nuclear@1 3258 png_row_infop row_info));
nuclear@1 3259
nuclear@1 3260 /* Write out the filtered row. */
nuclear@1 3261 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
nuclear@1 3262 png_bytep filtered_row));
nuclear@1 3263 /* finish a row while reading, dealing with interlacing passes, etc. */
nuclear@1 3264 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
nuclear@1 3265
nuclear@1 3266 /* initialize the row buffers, etc. */
nuclear@1 3267 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
nuclear@1 3268 /* optional call to update the users info structure */
nuclear@1 3269 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
nuclear@1 3270 png_infop info_ptr));
nuclear@1 3271
nuclear@1 3272 /* these are the functions that do the transformations */
nuclear@1 3273 #if defined(PNG_READ_FILLER_SUPPORTED)
nuclear@1 3274 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
nuclear@1 3275 png_bytep row, png_uint_32 filler, png_uint_32 flags));
nuclear@1 3276 #endif
nuclear@1 3277
nuclear@1 3278 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@1 3279 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
nuclear@1 3280 png_bytep row));
nuclear@1 3281 #endif
nuclear@1 3282
nuclear@1 3283 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@1 3284 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
nuclear@1 3285 png_bytep row));
nuclear@1 3286 #endif
nuclear@1 3287
nuclear@1 3288 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@1 3289 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
nuclear@1 3290 png_bytep row));
nuclear@1 3291 #endif
nuclear@1 3292
nuclear@1 3293 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@1 3294 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
nuclear@1 3295 png_bytep row));
nuclear@1 3296 #endif
nuclear@1 3297
nuclear@1 3298 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
nuclear@1 3299 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@1 3300 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
nuclear@1 3301 png_bytep row, png_uint_32 flags));
nuclear@1 3302 #endif
nuclear@1 3303
nuclear@1 3304 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@1 3305 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3306 #endif
nuclear@1 3307
nuclear@1 3308 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@1 3309 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3310 #endif
nuclear@1 3311
nuclear@1 3312 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@1 3313 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
nuclear@1 3314 row_info, png_bytep row));
nuclear@1 3315 #endif
nuclear@1 3316
nuclear@1 3317 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@1 3318 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
nuclear@1 3319 png_bytep row));
nuclear@1 3320 #endif
nuclear@1 3321
nuclear@1 3322 #if defined(PNG_READ_PACK_SUPPORTED)
nuclear@1 3323 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3324 #endif
nuclear@1 3325
nuclear@1 3326 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@1 3327 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@1 3328 png_color_8p sig_bits));
nuclear@1 3329 #endif
nuclear@1 3330
nuclear@1 3331 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@1 3332 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3333 #endif
nuclear@1 3334
nuclear@1 3335 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@1 3336 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3337 #endif
nuclear@1 3338
nuclear@1 3339 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@1 3340 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
nuclear@1 3341 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
nuclear@1 3342
nuclear@1 3343 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
nuclear@1 3344 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
nuclear@1 3345 png_colorp palette, int num_palette));
nuclear@1 3346 # endif
nuclear@1 3347 #endif
nuclear@1 3348
nuclear@1 3349 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@1 3350 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
nuclear@1 3351 #endif
nuclear@1 3352
nuclear@1 3353 #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@1 3354 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
nuclear@1 3355 png_bytep row, png_uint_32 bit_depth));
nuclear@1 3356 #endif
nuclear@1 3357
nuclear@1 3358 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@1 3359 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@1 3360 png_color_8p bit_depth));
nuclear@1 3361 #endif
nuclear@1 3362
nuclear@1 3363 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@1 3364 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 3365 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@1 3366 png_color_16p trans_values, png_color_16p background,
nuclear@1 3367 png_color_16p background_1,
nuclear@1 3368 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
nuclear@1 3369 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
nuclear@1 3370 png_uint_16pp gamma_16_to_1, int gamma_shift));
nuclear@1 3371 #else
nuclear@1 3372 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@1 3373 png_color_16p trans_values, png_color_16p background));
nuclear@1 3374 #endif
nuclear@1 3375 #endif
nuclear@1 3376
nuclear@1 3377 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@1 3378 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
nuclear@1 3379 png_bytep gamma_table, png_uint_16pp gamma_16_table,
nuclear@1 3380 int gamma_shift));
nuclear@1 3381 #endif
nuclear@1 3382
nuclear@1 3383 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@1 3384 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
nuclear@1 3385 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
nuclear@1 3386 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
nuclear@1 3387 png_bytep row, png_color_16p trans_value));
nuclear@1 3388 #endif
nuclear@1 3389
nuclear@1 3390 /* The following decodes the appropriate chunks, and does error correction,
nuclear@1 3391 * then calls the appropriate callback for the chunk if it is valid.
nuclear@1 3392 */
nuclear@1 3393
nuclear@1 3394 /* decode the IHDR chunk */
nuclear@1 3395 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3396 png_uint_32 length));
nuclear@1 3397 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3398 png_uint_32 length));
nuclear@1 3399 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3400 png_uint_32 length));
nuclear@1 3401
nuclear@1 3402 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@1 3403 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3404 png_uint_32 length));
nuclear@1 3405 #endif
nuclear@1 3406
nuclear@1 3407 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@1 3408 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3409 png_uint_32 length));
nuclear@1 3410 #endif
nuclear@1 3411
nuclear@1 3412 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@1 3413 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3414 png_uint_32 length));
nuclear@1 3415 #endif
nuclear@1 3416
nuclear@1 3417 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@1 3418 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3419 png_uint_32 length));
nuclear@1 3420 #endif
nuclear@1 3421
nuclear@1 3422 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@1 3423 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3424 png_uint_32 length));
nuclear@1 3425 #endif /* PNG_READ_iCCP_SUPPORTED */
nuclear@1 3426
nuclear@1 3427 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 3428 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3429 png_uint_32 length));
nuclear@1 3430 #endif
nuclear@1 3431
nuclear@1 3432 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@1 3433 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3434 png_uint_32 length));
nuclear@1 3435 #endif
nuclear@1 3436
nuclear@1 3437 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@1 3438 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3439 png_uint_32 length));
nuclear@1 3440 #endif
nuclear@1 3441
nuclear@1 3442 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@1 3443 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3444 png_uint_32 length));
nuclear@1 3445 #endif
nuclear@1 3446
nuclear@1 3447 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@1 3448 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3449 png_uint_32 length));
nuclear@1 3450 #endif
nuclear@1 3451
nuclear@1 3452 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@1 3453 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3454 png_uint_32 length));
nuclear@1 3455 #endif
nuclear@1 3456
nuclear@1 3457 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@1 3458 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3459 png_uint_32 length));
nuclear@1 3460 #endif /* PNG_READ_sPLT_SUPPORTED */
nuclear@1 3461
nuclear@1 3462 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@1 3463 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3464 png_uint_32 length));
nuclear@1 3465 #endif
nuclear@1 3466
nuclear@1 3467 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 3468 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3469 png_uint_32 length));
nuclear@1 3470 #endif
nuclear@1 3471
nuclear@1 3472 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@1 3473 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3474 png_uint_32 length));
nuclear@1 3475 #endif
nuclear@1 3476
nuclear@1 3477 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@1 3478 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3479 png_uint_32 length));
nuclear@1 3480 #endif
nuclear@1 3481
nuclear@1 3482 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 3483 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@1 3484 png_uint_32 length));
nuclear@1 3485 #endif
nuclear@1 3486
nuclear@1 3487 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
nuclear@1 3488 png_infop info_ptr, png_uint_32 length));
nuclear@1 3489
nuclear@1 3490 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
nuclear@1 3491 png_bytep chunk_name));
nuclear@1 3492
nuclear@1 3493 /* handle the transformations for reading and writing */
nuclear@1 3494 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
nuclear@1 3495 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
nuclear@1 3496
nuclear@1 3497 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
nuclear@1 3498
nuclear@1 3499 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@1 3500 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
nuclear@1 3501 png_infop info_ptr));
nuclear@1 3502 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
nuclear@1 3503 png_infop info_ptr));
nuclear@1 3504 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
nuclear@1 3505 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
nuclear@1 3506 png_uint_32 length));
nuclear@1 3507 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
nuclear@1 3508 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
nuclear@1 3509 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
nuclear@1 3510 png_bytep buffer, png_size_t buffer_length));
nuclear@1 3511 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
nuclear@1 3512 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
nuclear@1 3513 png_bytep buffer, png_size_t buffer_length));
nuclear@1 3514 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
nuclear@1 3515 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
nuclear@1 3516 png_infop info_ptr, png_uint_32 length));
nuclear@1 3517 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
nuclear@1 3518 png_infop info_ptr));
nuclear@1 3519 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
nuclear@1 3520 png_infop info_ptr));
nuclear@1 3521 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
nuclear@1 3522 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
nuclear@1 3523 png_infop info_ptr));
nuclear@1 3524 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
nuclear@1 3525 png_infop info_ptr));
nuclear@1 3526 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
nuclear@1 3527 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@1 3528 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
nuclear@1 3529 png_infop info_ptr, png_uint_32 length));
nuclear@1 3530 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
nuclear@1 3531 png_infop info_ptr));
nuclear@1 3532 #endif
nuclear@1 3533 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@1 3534 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
nuclear@1 3535 png_infop info_ptr, png_uint_32 length));
nuclear@1 3536 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
nuclear@1 3537 png_infop info_ptr));
nuclear@1 3538 #endif
nuclear@1 3539 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@1 3540 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
nuclear@1 3541 png_infop info_ptr, png_uint_32 length));
nuclear@1 3542 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
nuclear@1 3543 png_infop info_ptr));
nuclear@1 3544 #endif
nuclear@1 3545
nuclear@1 3546 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@1 3547
nuclear@1 3548 #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@1 3549 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
nuclear@1 3550 png_bytep row));
nuclear@1 3551 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
nuclear@1 3552 png_bytep row));
nuclear@1 3553 #endif
nuclear@1 3554
nuclear@1 3555 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@1 3556 #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@1 3557 /* png.c */ /* PRIVATE */
nuclear@1 3558 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
nuclear@1 3559 #endif
nuclear@1 3560 #endif
nuclear@1 3561
nuclear@1 3562 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@1 3563 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@1 3564 png_infop info_ptr));
nuclear@1 3565
nuclear@1 3566 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@1 3567 png_infop info_ptr));
nuclear@1 3568
nuclear@1 3569 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@1 3570 png_infop info_ptr));
nuclear@1 3571
nuclear@1 3572 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
nuclear@1 3573 png_infop info_ptr));
nuclear@1 3574
nuclear@1 3575 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
nuclear@1 3576 png_infop info_ptr));
nuclear@1 3577
nuclear@1 3578 #if defined(PNG_pHYs_SUPPORTED)
nuclear@1 3579 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
nuclear@1 3580 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@1 3581 #endif /* PNG_pHYs_SUPPORTED */
nuclear@1 3582 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
nuclear@1 3583
nuclear@1 3584 /* Read the chunk header (length + type name) */
nuclear@1 3585 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
nuclear@1 3586
nuclear@1 3587 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
nuclear@1 3588
nuclear@1 3589 #endif /* PNG_INTERNAL */
nuclear@1 3590
nuclear@1 3591 #ifdef __cplusplus
nuclear@1 3592 }
nuclear@1 3593 #endif
nuclear@1 3594
nuclear@1 3595 #endif /* PNG_VERSION_INFO_ONLY */
nuclear@1 3596 /* do not put anything past this line */
nuclear@1 3597 #endif /* PNG_H */