istereo: libs/libpng/png.h annotate

istereo

annotate libs/libpng/png.h @ 28:c0ae8e668447

added vmath library

author	John Tsiombikas <nuclear@mutantstargoat.com>
date	Thu, 08 Sep 2011 08:30:42 +0300
parents
children

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