istereo2: libs/libpng/png.h annotate

istereo2

annotate libs/libpng/png.h @ 2:81d35769f546

added the tunnel effect source

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sat, 19 Sep 2015 05:51:51 +0300
parents
children

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