WebSVN – pentevo – Blame – /tools/unreal_fix/0.39.0/fix

Rev	Author	Line No.	Line
716	lvd	1	/* png.h - header file for PNG reference library
		2	*
		3	* libpng version 1.2.37 - June 4, 2009
		4	* Copyright (c) 1998-2009 Glenn Randers-Pehrson
		5	* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
		6	* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
		7	*
		8	* Authors and maintainers:
		9	* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
		10	* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
		11	* libpng versions 0.97, January 1998, through 1.2.37 - June 4, 2009: Glenn
		12	* See also "Contributing Authors", below.
		13	*
		14	* Note about libpng version numbers:
		15	*
		16	* Due to various miscommunications, unforeseen code incompatibilities
		17	* and occasional factors outside the authors' control, version numbering
		18	* on the library has not always been consistent and straightforward.
		19	* The following table summarizes matters since version 0.89c, which was
		20	* the first widely used release:
		21	*
		22	* source png.h png.h shared-lib
		23	* version string int version
		24	* ------- ------ ----- ----------
		25	* 0.89c "1.0 beta 3" 0.89 89 1.0.89
		26	* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
		27	* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
		28	* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
		29	* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
		30	* 0.97c 0.97 97 2.0.97
		31	* 0.98 0.98 98 2.0.98
		32	* 0.99 0.99 98 2.0.99
		33	* 0.99a-m 0.99 99 2.0.99
		34	* 1.00 1.00 100 2.1.0 [100 should be 10000]
		35	* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
		36	* 1.0.1 png.h string is 10001 2.1.0
		37	* 1.0.1a-e identical to the 10002 from here on, the shared library
		38	* 1.0.2 source version) 10002 is 2.V where V is the source code
		39	* 1.0.2a-b 10003 version, except as noted.
		40	* 1.0.3 10003
		41	* 1.0.3a-d 10004
		42	* 1.0.4 10004
		43	* 1.0.4a-f 10005
		44	* 1.0.5 (+ 2 patches) 10005
		45	* 1.0.5a-d 10006
		46	* 1.0.5e-r 10100 (not source compatible)
		47	* 1.0.5s-v 10006 (not binary compatible)
		48	* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
		49	* 1.0.6d-f 10007 (still binary incompatible)
		50	* 1.0.6g 10007
		51	* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
		52	* 1.0.6i 10007 10.6i
		53	* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
		54	* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
		55	* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
		56	* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
		57	* 1.0.7 1 10007 (still compatible)
		58	* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
		59	* 1.0.8rc1 1 10008 2.1.0.8rc1
		60	* 1.0.8 1 10008 2.1.0.8
		61	* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
		62	* 1.0.9rc1 1 10009 2.1.0.9rc1
		63	* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
		64	* 1.0.9rc2 1 10009 2.1.0.9rc2
		65	* 1.0.9 1 10009 2.1.0.9
		66	* 1.0.10beta1 1 10010 2.1.0.10beta1
		67	* 1.0.10rc1 1 10010 2.1.0.10rc1
		68	* 1.0.10 1 10010 2.1.0.10
		69	* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
		70	* 1.0.11rc1 1 10011 2.1.0.11rc1
		71	* 1.0.11 1 10011 2.1.0.11
		72	* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
		73	* 1.0.12rc1 2 10012 2.1.0.12rc1
		74	* 1.0.12 2 10012 2.1.0.12
		75	* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
		76	* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
		77	* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
		78	* 1.2.0rc1 3 10200 3.1.2.0rc1
		79	* 1.2.0 3 10200 3.1.2.0
		80	* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
		81	* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
		82	* 1.2.1 3 10201 3.1.2.1
		83	* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
		84	* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
		85	* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
		86	* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
		87	* 1.0.13 10 10013 10.so.0.1.0.13
		88	* 1.2.2 12 10202 12.so.0.1.2.2
		89	* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
		90	* 1.2.3 12 10203 12.so.0.1.2.3
		91	* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
		92	* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
		93	* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
		94	* 1.0.14 10 10014 10.so.0.1.0.14
		95	* 1.2.4 13 10204 12.so.0.1.2.4
		96	* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
		97	* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
		98	* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
		99	* 1.0.15 10 10015 10.so.0.1.0.15
		100	* 1.2.5 13 10205 12.so.0.1.2.5
		101	* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
		102	* 1.0.16 10 10016 10.so.0.1.0.16
		103	* 1.2.6 13 10206 12.so.0.1.2.6
		104	* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
		105	* 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
		106	* 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
		107	* 1.0.17 10 10017 10.so.0.1.0.17
		108	* 1.2.7 13 10207 12.so.0.1.2.7
		109	* 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
		110	* 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
		111	* 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
		112	* 1.0.18 10 10018 10.so.0.1.0.18
		113	* 1.2.8 13 10208 12.so.0.1.2.8
		114	* 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
		115	* 1.2.9beta4-11 13 10209 12.so.0.9[.0]
		116	* 1.2.9rc1 13 10209 12.so.0.9[.0]
		117	* 1.2.9 13 10209 12.so.0.9[.0]
		118	* 1.2.10beta1-8 13 10210 12.so.0.10[.0]
		119	* 1.2.10rc1-3 13 10210 12.so.0.10[.0]
		120	* 1.2.10 13 10210 12.so.0.10[.0]
		121	* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
		122	* 1.0.19rc1-5 10 10019 10.so.0.19[.0]
		123	* 1.2.11rc1-5 13 10211 12.so.0.11[.0]
		124	* 1.0.19 10 10019 10.so.0.19[.0]
		125	* 1.2.11 13 10211 12.so.0.11[.0]
		126	* 1.0.20 10 10020 10.so.0.20[.0]
		127	* 1.2.12 13 10212 12.so.0.12[.0]
		128	* 1.2.13beta1 13 10213 12.so.0.13[.0]
		129	* 1.0.21 10 10021 10.so.0.21[.0]
		130	* 1.2.13 13 10213 12.so.0.13[.0]
		131	* 1.2.14beta1-2 13 10214 12.so.0.14[.0]
		132	* 1.0.22rc1 10 10022 10.so.0.22[.0]
		133	* 1.2.14rc1 13 10214 12.so.0.14[.0]
		134	* 1.0.22 10 10022 10.so.0.22[.0]
		135	* 1.2.14 13 10214 12.so.0.14[.0]
		136	* 1.2.15beta1-6 13 10215 12.so.0.15[.0]
		137	* 1.0.23rc1-5 10 10023 10.so.0.23[.0]
		138	* 1.2.15rc1-5 13 10215 12.so.0.15[.0]
		139	* 1.0.23 10 10023 10.so.0.23[.0]
		140	* 1.2.15 13 10215 12.so.0.15[.0]
		141	* 1.2.16beta1-2 13 10216 12.so.0.16[.0]
		142	* 1.2.16rc1 13 10216 12.so.0.16[.0]
		143	* 1.0.24 10 10024 10.so.0.24[.0]
		144	* 1.2.16 13 10216 12.so.0.16[.0]
		145	* 1.2.17beta1-2 13 10217 12.so.0.17[.0]
		146	* 1.0.25rc1 10 10025 10.so.0.25[.0]
		147	* 1.2.17rc1-3 13 10217 12.so.0.17[.0]
		148	* 1.0.25 10 10025 10.so.0.25[.0]
		149	* 1.2.17 13 10217 12.so.0.17[.0]
		150	* 1.0.26 10 10026 10.so.0.26[.0]
		151	* 1.2.18 13 10218 12.so.0.18[.0]
		152	* 1.2.19beta1-31 13 10219 12.so.0.19[.0]
		153	* 1.0.27rc1-6 10 10027 10.so.0.27[.0]
		154	* 1.2.19rc1-6 13 10219 12.so.0.19[.0]
		155	* 1.0.27 10 10027 10.so.0.27[.0]
		156	* 1.2.19 13 10219 12.so.0.19[.0]
		157	* 1.2.20beta01-04 13 10220 12.so.0.20[.0]
		158	* 1.0.28rc1-6 10 10028 10.so.0.28[.0]
		159	* 1.2.20rc1-6 13 10220 12.so.0.20[.0]
		160	* 1.0.28 10 10028 10.so.0.28[.0]
		161	* 1.2.20 13 10220 12.so.0.20[.0]
		162	* 1.2.21beta1-2 13 10221 12.so.0.21[.0]
		163	* 1.2.21rc1-3 13 10221 12.so.0.21[.0]
		164	* 1.0.29 10 10029 10.so.0.29[.0]
		165	* 1.2.21 13 10221 12.so.0.21[.0]
		166	* 1.2.22beta1-4 13 10222 12.so.0.22[.0]
		167	* 1.0.30rc1 10 10030 10.so.0.30[.0]
		168	* 1.2.22rc1 13 10222 12.so.0.22[.0]
		169	* 1.0.30 10 10030 10.so.0.30[.0]
		170	* 1.2.22 13 10222 12.so.0.22[.0]
		171	* 1.2.23beta01-05 13 10223 12.so.0.23[.0]
		172	* 1.2.23rc01 13 10223 12.so.0.23[.0]
		173	* 1.2.23 13 10223 12.so.0.23[.0]
		174	* 1.2.24beta01-02 13 10224 12.so.0.24[.0]
		175	* 1.2.24rc01 13 10224 12.so.0.24[.0]
		176	* 1.2.24 13 10224 12.so.0.24[.0]
		177	* 1.2.25beta01-06 13 10225 12.so.0.25[.0]
		178	* 1.2.25rc01-02 13 10225 12.so.0.25[.0]
		179	* 1.0.31 10 10031 10.so.0.31[.0]
		180	* 1.2.25 13 10225 12.so.0.25[.0]
		181	* 1.2.26beta01-06 13 10226 12.so.0.26[.0]
		182	* 1.2.26rc01 13 10226 12.so.0.26[.0]
		183	* 1.2.26 13 10226 12.so.0.26[.0]
		184	* 1.0.32 10 10032 10.so.0.32[.0]
		185	* 1.2.27beta01-06 13 10227 12.so.0.27[.0]
		186	* 1.2.27rc01 13 10227 12.so.0.27[.0]
		187	* 1.0.33 10 10033 10.so.0.33[.0]
		188	* 1.2.27 13 10227 12.so.0.27[.0]
		189	* 1.0.34 10 10034 10.so.0.34[.0]
		190	* 1.2.28 13 10228 12.so.0.28[.0]
		191	* 1.2.29beta01-03 13 10229 12.so.0.29[.0]
		192	* 1.2.29rc01 13 10229 12.so.0.29[.0]
		193	* 1.0.35 10 10035 10.so.0.35[.0]
		194	* 1.2.29 13 10229 12.so.0.29[.0]
		195	* 1.0.37 10 10037 10.so.0.37[.0]
		196	* 1.2.30beta01-04 13 10230 12.so.0.30[.0]
		197	* 1.0.38rc01-08 10 10038 10.so.0.38[.0]
		198	* 1.2.30rc01-08 13 10230 12.so.0.30[.0]
		199	* 1.0.38 10 10038 10.so.0.38[.0]
		200	* 1.2.30 13 10230 12.so.0.30[.0]
		201	* 1.0.39rc01-03 10 10039 10.so.0.39[.0]
		202	* 1.2.31rc01-03 13 10231 12.so.0.31[.0]
		203	* 1.0.39 10 10039 10.so.0.39[.0]
		204	* 1.2.31 13 10231 12.so.0.31[.0]
		205	* 1.2.32beta01-02 13 10232 12.so.0.32[.0]
		206	* 1.0.40rc01 10 10040 10.so.0.40[.0]
		207	* 1.2.32rc01 13 10232 12.so.0.32[.0]
		208	* 1.0.40 10 10040 10.so.0.40[.0]
		209	* 1.2.32 13 10232 12.so.0.32[.0]
		210	* 1.2.33beta01-02 13 10233 12.so.0.33[.0]
		211	* 1.2.33rc01-02 13 10233 12.so.0.33[.0]
		212	* 1.0.41rc01 10 10041 10.so.0.41[.0]
		213	* 1.2.33 13 10233 12.so.0.33[.0]
		214	* 1.0.41 10 10041 10.so.0.41[.0]
		215	* 1.2.34beta01-07 13 10234 12.so.0.34[.0]
		216	* 1.0.42rc01 10 10042 10.so.0.42[.0]
		217	* 1.2.34rc01 13 10234 12.so.0.34[.0]
		218	* 1.0.42 10 10042 10.so.0.42[.0]
		219	* 1.2.34 13 10234 12.so.0.34[.0]
		220	* 1.2.35beta01-03 13 10235 12.so.0.35[.0]
		221	* 1.0.43rc01-02 10 10043 10.so.0.43[.0]
		222	* 1.2.35rc01-02 13 10235 12.so.0.35[.0]
		223	* 1.0.43 10 10043 10.so.0.43[.0]
		224	* 1.2.35 13 10235 12.so.0.35[.0]
		225	* 1.2.36beta01-05 13 10236 12.so.0.36[.0]
		226	* 1.2.36rc01 13 10236 12.so.0.36[.0]
		227	* 1.0.44 10 10044 10.so.0.44[.0]
		228	* 1.2.36 13 10236 12.so.0.36[.0]
		229	* 1.2.37beta01-03 13 10237 12.so.0.37[.0]
		230	* 1.2.37rc01 13 10237 12.so.0.37[.0]
		231	* 1.2.37 13 10237 12.so.0.37[.0]
		232	*
		233	* Henceforth the source version will match the shared-library major
		234	* and minor numbers; the shared-library major version number will be
		235	* used for changes in backward compatibility, as it is intended. The
		236	* PNG_LIBPNG_VER macro, which is not used within libpng but is available
		237	* for applications, is an unsigned integer of the form xyyzz corresponding
		238	* to the source version x.y.z (leading zeros in y and z). Beta versions
		239	* were given the previous public release number plus a letter, until
		240	* version 1.0.6j; from then on they were given the upcoming public
		241	* release number plus "betaNN" or "rcNN".
		242	*
		243	* Binary incompatibility exists only when applications make direct access
		244	* to the info_ptr or png_ptr members through png.h, and the compiled
		245	* application is loaded with a different version of the library.
		246	*
		247	* DLLNUM will change each time there are forward or backward changes
		248	* in binary compatibility (e.g., when a new feature is added).
		249	*
		250	* See libpng.txt or libpng.3 for more information. The PNG specification
		251	* is available as a W3C Recommendation and as an ISO Specification,
		252	* <http://www.w3.org/TR/2003/REC-PNG-20031110/
		253	*/
		254
		255	/*
		256	* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
		257	*
		258	* If you modify libpng you may insert additional notices immediately following
		259	* this sentence.
		260	*
		261	* libpng versions 1.2.6, August 15, 2004, through 1.2.37, June 4, 2009, are
		262	* Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
		263	* distributed according to the same disclaimer and license as libpng-1.2.5
		264	* with the following individual added to the list of Contributing Authors:
		265	*
		266	* Cosmin Truta
		267	*
		268	* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
		269	* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
		270	* distributed according to the same disclaimer and license as libpng-1.0.6
		271	* with the following individuals added to the list of Contributing Authors:
		272	*
		273	* Simon-Pierre Cadieux
		274	* Eric S. Raymond
		275	* Gilles Vollant
		276	*
		277	* and with the following additions to the disclaimer:
		278	*
		279	* There is no warranty against interference with your enjoyment of the
		280	* library or against infringement. There is no warranty that our
		281	* efforts or the library will fulfill any of your particular purposes
		282	* or needs. This library is provided with all faults, and the entire
		283	* risk of satisfactory quality, performance, accuracy, and effort is with
		284	* the user.
		285	*
		286	* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
		287	* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
		288	* distributed according to the same disclaimer and license as libpng-0.96,
		289	* with the following individuals added to the list of Contributing Authors:
		290	*
		291	* Tom Lane
		292	* Glenn Randers-Pehrson
		293	* Willem van Schaik
		294	*
		295	* libpng versions 0.89, June 1996, through 0.96, May 1997, are
		296	* Copyright (c) 1996, 1997 Andreas Dilger
		297	* Distributed according to the same disclaimer and license as libpng-0.88,
		298	* with the following individuals added to the list of Contributing Authors:
		299	*
		300	* John Bowler
		301	* Kevin Bracey
		302	* Sam Bushell
		303	* Magnus Holmgren
		304	* Greg Roelofs
		305	* Tom Tanner
		306	*
		307	* libpng versions 0.5, May 1995, through 0.88, January 1996, are
		308	* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
		309	*
		310	* For the purposes of this copyright and license, "Contributing Authors"
		311	* is defined as the following set of individuals:
		312	*
		313	* Andreas Dilger
		314	* Dave Martindale
		315	* Guy Eric Schalnat
		316	* Paul Schmidt
		317	* Tim Wegner
		318	*
		319	* The PNG Reference Library is supplied "AS IS". The Contributing Authors
		320	* and Group 42, Inc. disclaim all warranties, expressed or implied,
		321	* including, without limitation, the warranties of merchantability and of
		322	* fitness for any purpose. The Contributing Authors and Group 42, Inc.
		323	* assume no liability for direct, indirect, incidental, special, exemplary,
		324	* or consequential damages, which may result from the use of the PNG
		325	* Reference Library, even if advised of the possibility of such damage.
		326	*
		327	* Permission is hereby granted to use, copy, modify, and distribute this
		328	* source code, or portions hereof, for any purpose, without fee, subject
		329	* to the following restrictions:
		330	*
		331	* 1. The origin of this source code must not be misrepresented.
		332	*
		333	* 2. Altered versions must be plainly marked as such and
		334	* must not be misrepresented as being the original source.
		335	*
		336	* 3. This Copyright notice may not be removed or altered from
		337	* any source or altered source distribution.
		338	*
		339	* The Contributing Authors and Group 42, Inc. specifically permit, without
		340	* fee, and encourage the use of this source code as a component to
		341	* supporting the PNG file format in commercial products. If you use this
		342	* source code in a product, acknowledgment is not required but would be
		343	* appreciated.
		344	*/
		345
		346	/*
		347	* A "png_get_copyright" function is available, for convenient use in "about"
		348	* boxes and the like:
		349	*
		350	* printf("%s",png_get_copyright(NULL));
		351	*
		352	* Also, the PNG logo (in PNG format, of course) is supplied in the
		353	* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
		354	*/
		355
		356	/*
		357	* Libpng is OSI Certified Open Source Software. OSI Certified is a
		358	* certification mark of the Open Source Initiative.
		359	*/
		360
		361	/*
		362	* The contributing authors would like to thank all those who helped
		363	* with testing, bug fixes, and patience. This wouldn't have been
		364	* possible without all of you.
		365	*
		366	* Thanks to Frank J. T. Wojcik for helping with the documentation.
		367	*/
		368
		369	/*
		370	* Y2K compliance in libpng:
		371	* =========================
		372	*
		373	* June 4, 2009
		374	*
		375	* Since the PNG Development group is an ad-hoc body, we can't make
		376	* an official declaration.
		377	*
		378	* This is your unofficial assurance that libpng from version 0.71 and
		379	* upward through 1.2.37 are Y2K compliant. It is my belief that earlier
		380	* versions were also Y2K compliant.
		381	*
		382	* Libpng only has three year fields. One is a 2-byte unsigned integer
		383	* that will hold years up to 65535. The other two hold the date in text
		384	* format, and will hold years up to 9999.
		385	*
		386	* The integer is
		387	* "png_uint_16 year" in png_time_struct.
		388	*
		389	* The strings are
		390	* "png_charp time_buffer" in png_struct and
		391	* "near_time_buffer", which is a local character string in png.c.
		392	*
		393	* There are seven time-related functions:
		394	* png.c: png_convert_to_rfc_1123() in png.c
		395	* (formerly png_convert_to_rfc_1152() in error)
		396	* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
		397	* png_convert_from_time_t() in pngwrite.c
		398	* png_get_tIME() in pngget.c
		399	* png_handle_tIME() in pngrutil.c, called in pngread.c
		400	* png_set_tIME() in pngset.c
		401	* png_write_tIME() in pngwutil.c, called in pngwrite.c
		402	*
		403	* All handle dates properly in a Y2K environment. The
		404	* png_convert_from_time_t() function calls gmtime() to convert from system
		405	* clock time, which returns (year - 1900), which we properly convert to
		406	* the full 4-digit year. There is a possibility that applications using
		407	* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
		408	* function, or that they are incorrectly passing only a 2-digit year
		409	* instead of "year - 1900" into the png_convert_from_struct_tm() function,
		410	* but this is not under our control. The libpng documentation has always
		411	* stated that it works with 4-digit years, and the APIs have been
		412	* documented as such.
		413	*
		414	* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
		415	* integer to hold the year, and can hold years as large as 65535.
		416	*
		417	* zlib, upon which libpng depends, is also Y2K compliant. It contains
		418	* no date-related code.
		419	*
		420	* Glenn Randers-Pehrson
		421	* libpng maintainer
		422	* PNG Development Group
		423	*/
		424
		425	#ifndef PNG_H
		426	#define PNG_H
		427
		428	/* This is not the place to learn how to use libpng. The file libpng.txt
		429	* describes how to use libpng, and the file example.c summarizes it
		430	* with some code on which to build. This file is useful for looking
		431	* at the actual function definitions and structure components.
		432	*/
		433
		434	/* Version information for png.h - this should match the version in png.c */
		435	#define PNG_LIBPNG_VER_STRING "1.2.37"
		436	#define PNG_HEADER_VERSION_STRING \
		437	" libpng version 1.2.37 - June 4, 2009\n"
		438
		439	#define PNG_LIBPNG_VER_SONUM 0
		440	#define PNG_LIBPNG_VER_DLLNUM 13
		441
		442	/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
		443	#define PNG_LIBPNG_VER_MAJOR 1
		444	#define PNG_LIBPNG_VER_MINOR 2
		445	#define PNG_LIBPNG_VER_RELEASE 37
		446	/* This should match the numeric part of the final component of
		447	* PNG_LIBPNG_VER_STRING, omitting any leading zero: */
		448
		449	#define PNG_LIBPNG_VER_BUILD 0
		450
		451	/* Release Status */
		452	#define PNG_LIBPNG_BUILD_ALPHA 1
		453	#define PNG_LIBPNG_BUILD_BETA 2
		454	#define PNG_LIBPNG_BUILD_RC 3
		455	#define PNG_LIBPNG_BUILD_STABLE 4
		456	#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
		457
		458	/* Release-Specific Flags */
		459	#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
		460	PNG_LIBPNG_BUILD_STABLE only */
		461	#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
		462	PNG_LIBPNG_BUILD_SPECIAL */
		463	#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
		464	PNG_LIBPNG_BUILD_PRIVATE */
		465
		466	#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
		467
		468	/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
		469	* We must not include leading zeros.
		470	* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
		471	* version 1.0.0 was mis-numbered 100 instead of 10000). From
		472	* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
		473	#define PNG_LIBPNG_VER 10237 /* 1.2.37 */
		474
		475	#ifndef PNG_VERSION_INFO_ONLY
		476	/* include the compression library's header */
		477	#include "zlib.h"
		478	#endif
		479
		480	/* include all user configurable info, including optional assembler routines */
		481	#include "pngconf.h"
		482
		483	/*
		484	* Added at libpng-1.2.8 */
		485	/* Ref MSDN: Private as priority over Special
		486	* VS_FF_PRIVATEBUILD File was not built using standard release
		487	* procedures. If this value is given, the StringFileInfo block must
		488	* contain a PrivateBuild string.
		489	*
		490	* VS_FF_SPECIALBUILD File was built by the original company using
		491	* standard release procedures but is a variation of the standard
		492	* file of the same version number. If this value is given, the
		493	* StringFileInfo block must contain a SpecialBuild string.
		494	*/
		495
		496	#if defined(PNG_USER_PRIVATEBUILD)
		497	# define PNG_LIBPNG_BUILD_TYPE \
		498	(PNG_LIBPNG_BUILD_BASE_TYPE \| PNG_LIBPNG_BUILD_PRIVATE)
		499	#else
		500	# if defined(PNG_LIBPNG_SPECIALBUILD)
		501	# define PNG_LIBPNG_BUILD_TYPE \
		502	(PNG_LIBPNG_BUILD_BASE_TYPE \| PNG_LIBPNG_BUILD_SPECIAL)
		503	# else
		504	# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
		505	# endif
		506	#endif
		507
		508	#ifndef PNG_VERSION_INFO_ONLY
		509
		510	/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
		511	#ifdef __cplusplus
		512	extern "C" {
		513	#endif /* __cplusplus */
		514
		515	/* This file is arranged in several sections. The first section contains
		516	* structure and type definitions. The second section contains the external
		517	* library functions, while the third has the internal library functions,
		518	* which applications aren't expected to use directly.
		519	*/
		520
		521	#ifndef PNG_NO_TYPECAST_NULL
		522	#define int_p_NULL (int *)NULL
		523	#define png_bytep_NULL (png_bytep)NULL
		524	#define png_bytepp_NULL (png_bytepp)NULL
		525	#define png_doublep_NULL (png_doublep)NULL
		526	#define png_error_ptr_NULL (png_error_ptr)NULL
		527	#define png_flush_ptr_NULL (png_flush_ptr)NULL
		528	#define png_free_ptr_NULL (png_free_ptr)NULL
		529	#define png_infopp_NULL (png_infopp)NULL
		530	#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
		531	#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
		532	#define png_rw_ptr_NULL (png_rw_ptr)NULL
		533	#define png_structp_NULL (png_structp)NULL
		534	#define png_uint_16p_NULL (png_uint_16p)NULL
		535	#define png_voidp_NULL (png_voidp)NULL
		536	#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
		537	#else
		538	#define int_p_NULL NULL
		539	#define png_bytep_NULL NULL
		540	#define png_bytepp_NULL NULL
		541	#define png_doublep_NULL NULL
		542	#define png_error_ptr_NULL NULL
		543	#define png_flush_ptr_NULL NULL
		544	#define png_free_ptr_NULL NULL
		545	#define png_infopp_NULL NULL
		546	#define png_malloc_ptr_NULL NULL
		547	#define png_read_status_ptr_NULL NULL
		548	#define png_rw_ptr_NULL NULL
		549	#define png_structp_NULL NULL
		550	#define png_uint_16p_NULL NULL
		551	#define png_voidp_NULL NULL
		552	#define png_write_status_ptr_NULL NULL
		553	#endif
		554
		555	/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
		556	#if !defined(PNG_NO_EXTERN) \|\| defined(PNG_ALWAYS_EXTERN)
		557	/* Version information for C files, stored in png.c. This had better match
		558	* the version above.
		559	*/
		560	#ifdef PNG_USE_GLOBAL_ARRAYS
		561	PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
		562	/* need room for 99.99.99beta99z */
		563	#else
		564	#define png_libpng_ver png_get_header_ver(NULL)
		565	#endif
		566
		567	#ifdef PNG_USE_GLOBAL_ARRAYS
		568	/* This was removed in version 1.0.5c */
		569	/* Structures to facilitate easy interlacing. See png.c for more details */
		570	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
		571	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
		572	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
		573	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
		574	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
		575	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
		576	/* This isn't currently used. If you need it, see png.c for more details.
		577	PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
		578	*/
		579	#endif
		580
		581	#endif /* PNG_NO_EXTERN */
		582
		583	/* Three color definitions. The order of the red, green, and blue, (and the
		584	* exact size) is not important, although the size of the fields need to
		585	* be png_byte or png_uint_16 (as defined below).
		586	*/
		587	typedef struct png_color_struct
		588	{
		589	png_byte red;
		590	png_byte green;
		591	png_byte blue;
		592	} png_color;
		593	typedef png_color FAR * png_colorp;
		594	typedef png_color FAR * FAR * png_colorpp;
		595
		596	typedef struct png_color_16_struct
		597	{
		598	png_byte index; /* used for palette files */
		599	png_uint_16 red; /* for use in red green blue files */
		600	png_uint_16 green;
		601	png_uint_16 blue;
		602	png_uint_16 gray; /* for use in grayscale files */
		603	} png_color_16;
		604	typedef png_color_16 FAR * png_color_16p;
		605	typedef png_color_16 FAR * FAR * png_color_16pp;
		606
		607	typedef struct png_color_8_struct
		608	{
		609	png_byte red; /* for use in red green blue files */
		610	png_byte green;
		611	png_byte blue;
		612	png_byte gray; /* for use in grayscale files */
		613	png_byte alpha; /* for alpha channel files */
		614	} png_color_8;
		615	typedef png_color_8 FAR * png_color_8p;
		616	typedef png_color_8 FAR * FAR * png_color_8pp;
		617
		618	/*
		619	* The following two structures are used for the in-core representation
		620	* of sPLT chunks.
		621	*/
		622	typedef struct png_sPLT_entry_struct
		623	{
		624	png_uint_16 red;
		625	png_uint_16 green;
		626	png_uint_16 blue;
		627	png_uint_16 alpha;
		628	png_uint_16 frequency;
		629	} png_sPLT_entry;
		630	typedef png_sPLT_entry FAR * png_sPLT_entryp;
		631	typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
		632
		633	/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
		634	* occupy the LSB of their respective members, and the MSB of each member
		635	* is zero-filled. The frequency member always occupies the full 16 bits.
		636	*/
		637
		638	typedef struct png_sPLT_struct
		639	{
		640	png_charp name; /* palette name */
		641	png_byte depth; /* depth of palette samples */
		642	png_sPLT_entryp entries; /* palette entries */
		643	png_int_32 nentries; /* number of palette entries */
		644	} png_sPLT_t;
		645	typedef png_sPLT_t FAR * png_sPLT_tp;
		646	typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
		647
		648	#ifdef PNG_TEXT_SUPPORTED
		649	/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
		650	* and whether that contents is compressed or not. The "key" field
		651	* points to a regular zero-terminated C string. The "text", "lang", and
		652	* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
		653	* However, the * structure returned by png_get_text() will always contain
		654	* regular zero-terminated C strings (possibly empty), never NULL pointers,
		655	* so they can be safely used in printf() and other string-handling functions.
		656	*/
		657	typedef struct png_text_struct
		658	{
		659	int compression; /* compression value:
		660	-1: tEXt, none
		661	0: zTXt, deflate
		662	1: iTXt, none
		663	2: iTXt, deflate */
		664	png_charp key; /* keyword, 1-79 character description of "text" */
		665	png_charp text; /* comment, may be an empty string (ie "")
		666	or a NULL pointer */
		667	png_size_t text_length; /* length of the text string */
		668	#ifdef PNG_iTXt_SUPPORTED
		669	png_size_t itxt_length; /* length of the itxt string */
		670	png_charp lang; /* language code, 0-79 characters
		671	or a NULL pointer */
		672	png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
		673	chars or a NULL pointer */
		674	#endif
		675	} png_text;
		676	typedef png_text FAR * png_textp;
		677	typedef png_text FAR * FAR * png_textpp;
		678	#endif
		679
		680	/* Supported compression types for text in PNG files (tEXt, and zTXt).
		681	* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
		682	#define PNG_TEXT_COMPRESSION_NONE_WR -3
		683	#define PNG_TEXT_COMPRESSION_zTXt_WR -2
		684	#define PNG_TEXT_COMPRESSION_NONE -1
		685	#define PNG_TEXT_COMPRESSION_zTXt 0
		686	#define PNG_ITXT_COMPRESSION_NONE 1
		687	#define PNG_ITXT_COMPRESSION_zTXt 2
		688	#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
		689
		690	/* png_time is a way to hold the time in an machine independent way.
		691	* Two conversions are provided, both from time_t and struct tm. There
		692	* is no portable way to convert to either of these structures, as far
		693	* as I know. If you know of a portable way, send it to me. As a side
		694	* note - PNG has always been Year 2000 compliant!
		695	*/
		696	typedef struct png_time_struct
		697	{
		698	png_uint_16 year; /* full year, as in, 1995 */
		699	png_byte month; /* month of year, 1 - 12 */
		700	png_byte day; /* day of month, 1 - 31 */
		701	png_byte hour; /* hour of day, 0 - 23 */
		702	png_byte minute; /* minute of hour, 0 - 59 */
		703	png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
		704	} png_time;
		705	typedef png_time FAR * png_timep;
		706	typedef png_time FAR * FAR * png_timepp;
		707
		708	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		709	/* png_unknown_chunk is a structure to hold queued chunks for which there is
		710	* no specific support. The idea is that we can use this to queue
		711	* up private chunks for output even though the library doesn't actually
		712	* know about their semantics.
		713	*/
		714	#define PNG_CHUNK_NAME_LENGTH 5
		715	typedef struct png_unknown_chunk_t
		716	{
		717	png_byte name[PNG_CHUNK_NAME_LENGTH];
		718	png_byte *data;
		719	png_size_t size;
		720
		721	/* libpng-using applications should NOT directly modify this byte. */
		722	png_byte location; /* mode of operation at read time */
		723	}
		724	png_unknown_chunk;
		725	typedef png_unknown_chunk FAR * png_unknown_chunkp;
		726	typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
		727	#endif
		728
		729	/* png_info is a structure that holds the information in a PNG file so
		730	* that the application can find out the characteristics of the image.
		731	* If you are reading the file, this structure will tell you what is
		732	* in the PNG file. If you are writing the file, fill in the information
		733	* you want to put into the PNG file, then call png_write_info().
		734	* The names chosen should be very close to the PNG specification, so
		735	* consult that document for information about the meaning of each field.
		736	*
		737	* With libpng < 0.95, it was only possible to directly set and read the
		738	* the values in the png_info_struct, which meant that the contents and
		739	* order of the values had to remain fixed. With libpng 0.95 and later,
		740	* however, there are now functions that abstract the contents of
		741	* png_info_struct from the application, so this makes it easier to use
		742	* libpng with dynamic libraries, and even makes it possible to use
		743	* libraries that don't have all of the libpng ancillary chunk-handing
		744	* functionality.
		745	*
		746	* In any case, the order of the parameters in png_info_struct should NOT
		747	* be changed for as long as possible to keep compatibility with applications
		748	* that use the old direct-access method with png_info_struct.
		749	*
		750	* The following members may have allocated storage attached that should be
		751	* cleaned up before the structure is discarded: palette, trans, text,
		752	* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
		753	* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
		754	* are automatically freed when the info structure is deallocated, if they were
		755	* allocated internally by libpng. This behavior can be changed by means
		756	* of the png_data_freer() function.
		757	*
		758	* More allocation details: all the chunk-reading functions that
		759	* change these members go through the corresponding png_set_*
		760	* functions. A function to clear these members is available: see
		761	* png_free_data(). The png_set_* functions do not depend on being
		762	* able to point info structure members to any of the storage they are
		763	* passed (they make their own copies), EXCEPT that the png_set_text
		764	* functions use the same storage passed to them in the text_ptr or
		765	* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
		766	* functions do not make their own copies.
		767	*/
		768	typedef struct png_info_struct
		769	{
		770	/* the following are necessary for every PNG file */
		771	png_uint_32 width; /* width of image in pixels (from IHDR) */
		772	png_uint_32 height; /* height of image in pixels (from IHDR) */
		773	png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
		774	png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
		775	png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
		776	png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
		777	png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
		778	png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
		779	png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
		780	/* The following three should have been named _method not _type */
		781	png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
		782	png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
		783	png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
		784
		785	/* The following is informational only on read, and not used on writes. */
		786	png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
		787	png_byte pixel_depth; /* number of bits per pixel */
		788	png_byte spare_byte; /* to align the data, and for future use */
		789	png_byte signature[8]; /* magic bytes read by libpng from start of file */
		790
		791	/* The rest of the data is optional. If you are reading, check the
		792	* valid field to see if the information in these are valid. If you
		793	* are writing, set the valid field to those chunks you want written,
		794	* and initialize the appropriate fields below.
		795	*/
		796
		797	#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
		798	/* The gAMA chunk describes the gamma characteristics of the system
		799	* on which the image was created, normally in the range [1.0, 2.5].
		800	* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
		801	*/
		802	float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
		803	#endif
		804
		805	#if defined(PNG_sRGB_SUPPORTED)
		806	/* GR-P, 0.96a */
		807	/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
		808	png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
		809	#endif
		810
		811	#if defined(PNG_TEXT_SUPPORTED)
		812	/* The tEXt, and zTXt chunks contain human-readable textual data in
		813	* uncompressed, compressed, and optionally compressed forms, respectively.
		814	* The data in "text" is an array of pointers to uncompressed,
		815	* null-terminated C strings. Each chunk has a keyword that describes the
		816	* textual data contained in that chunk. Keywords are not required to be
		817	* unique, and the text string may be empty. Any number of text chunks may
		818	* be in an image.
		819	*/
		820	int num_text; /* number of comments read/to write */
		821	int max_text; /* current size of text array */
		822	png_textp text; /* array of comments read/to write */
		823	#endif /* PNG_TEXT_SUPPORTED */
		824
		825	#if defined(PNG_tIME_SUPPORTED)
		826	/* The tIME chunk holds the last time the displayed image data was
		827	* modified. See the png_time struct for the contents of this struct.
		828	*/
		829	png_time mod_time;
		830	#endif
		831
		832	#if defined(PNG_sBIT_SUPPORTED)
		833	/* The sBIT chunk specifies the number of significant high-order bits
		834	* in the pixel data. Values are in the range [1, bit_depth], and are
		835	* only specified for the channels in the pixel data. The contents of
		836	* the low-order bits is not specified. Data is valid if
		837	* (valid & PNG_INFO_sBIT) is non-zero.
		838	*/
		839	png_color_8 sig_bit; /* significant bits in color channels */
		840	#endif
		841
		842	#if defined(PNG_tRNS_SUPPORTED) \|\| defined(PNG_READ_EXPAND_SUPPORTED) \|\| \
		843	defined(PNG_READ_BACKGROUND_SUPPORTED)
		844	/* The tRNS chunk supplies transparency data for paletted images and
		845	* other image types that don't need a full alpha channel. There are
		846	* "num_trans" transparency values for a paletted image, stored in the
		847	* same order as the palette colors, starting from index 0. Values
		848	* for the data are in the range [0, 255], ranging from fully transparent
		849	* to fully opaque, respectively. For non-paletted images, there is a
		850	* single color specified that should be treated as fully transparent.
		851	* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
		852	*/
		853	png_bytep trans; /* transparent values for paletted image */
		854	png_color_16 trans_values; /* transparent color for non-palette image */
		855	#endif
		856
		857	#if defined(PNG_bKGD_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED)
		858	/* The bKGD chunk gives the suggested image background color if the
		859	* display program does not have its own background color and the image
		860	* is needs to composited onto a background before display. The colors
		861	* in "background" are normally in the same color space/depth as the
		862	* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
		863	*/
		864	png_color_16 background;
		865	#endif
		866
		867	#if defined(PNG_oFFs_SUPPORTED)
		868	/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
		869	* and downwards from the top-left corner of the display, page, or other
		870	* application-specific co-ordinate space. See the PNG_OFFSET_ defines
		871	* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
		872	*/
		873	png_int_32 x_offset; /* x offset on page */
		874	png_int_32 y_offset; /* y offset on page */
		875	png_byte offset_unit_type; /* offset units type */
		876	#endif
		877
		878	#if defined(PNG_pHYs_SUPPORTED)
		879	/* The pHYs chunk gives the physical pixel density of the image for
		880	* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
		881	* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
		882	*/
		883	png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
		884	png_uint_32 y_pixels_per_unit; /* vertical pixel density */
		885	png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
		886	#endif
		887
		888	#if defined(PNG_hIST_SUPPORTED)
		889	/* The hIST chunk contains the relative frequency or importance of the
		890	* various palette entries, so that a viewer can intelligently select a
		891	* reduced-color palette, if required. Data is an array of "num_palette"
		892	* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
		893	* is non-zero.
		894	*/
		895	png_uint_16p hist;
		896	#endif
		897
		898	#ifdef PNG_cHRM_SUPPORTED
		899	/* The cHRM chunk describes the CIE color characteristics of the monitor
		900	* on which the PNG was created. This data allows the viewer to do gamut
		901	* mapping of the input image to ensure that the viewer sees the same
		902	* colors in the image as the creator. Values are in the range
		903	* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
		904	*/
		905	#ifdef PNG_FLOATING_POINT_SUPPORTED
		906	float x_white;
		907	float y_white;
		908	float x_red;
		909	float y_red;
		910	float x_green;
		911	float y_green;
		912	float x_blue;
		913	float y_blue;
		914	#endif
		915	#endif
		916
		917	#if defined(PNG_pCAL_SUPPORTED)
		918	/* The pCAL chunk describes a transformation between the stored pixel
		919	* values and original physical data values used to create the image.
		920	* The integer range [0, 2^bit_depth - 1] maps to the floating-point
		921	* range given by [pcal_X0, pcal_X1], and are further transformed by a
		922	* (possibly non-linear) transformation function given by "pcal_type"
		923	* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
		924	* defines below, and the PNG-Group's PNG extensions document for a
		925	* complete description of the transformations and how they should be
		926	* implemented, and for a description of the ASCII parameter strings.
		927	* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
		928	*/
		929	png_charp pcal_purpose; /* pCAL chunk description string */
		930	png_int_32 pcal_X0; /* minimum value */
		931	png_int_32 pcal_X1; /* maximum value */
		932	png_charp pcal_units; /* Latin-1 string giving physical units */
		933	png_charpp pcal_params; /* ASCII strings containing parameter values */
		934	png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
		935	png_byte pcal_nparams; /* number of parameters given in pcal_params */
		936	#endif
		937
		938	/* New members added in libpng-1.0.6 */
		939	#ifdef PNG_FREE_ME_SUPPORTED
		940	png_uint_32 free_me; /* flags items libpng is responsible for freeing */
		941	#endif
		942
		943	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		944	/* storage for unknown chunks that the library doesn't recognize. */
		945	png_unknown_chunkp unknown_chunks;
		946	png_size_t unknown_chunks_num;
		947	#endif
		948
		949	#if defined(PNG_iCCP_SUPPORTED)
		950	/* iCCP chunk data. */
		951	png_charp iccp_name; /* profile name */
		952	png_charp iccp_profile; /* International Color Consortium profile data */
		953	/* Note to maintainer: should be png_bytep */
		954	png_uint_32 iccp_proflen; /* ICC profile data length */
		955	png_byte iccp_compression; /* Always zero */
		956	#endif
		957
		958	#if defined(PNG_sPLT_SUPPORTED)
		959	/* data on sPLT chunks (there may be more than one). */
		960	png_sPLT_tp splt_palettes;
		961	png_uint_32 splt_palettes_num;
		962	#endif
		963
		964	#if defined(PNG_sCAL_SUPPORTED)
		965	/* The sCAL chunk describes the actual physical dimensions of the
		966	* subject matter of the graphic. The chunk contains a unit specification
		967	* a byte value, and two ASCII strings representing floating-point
		968	* values. The values are width and height corresponsing to one pixel
		969	* in the image. This external representation is converted to double
		970	* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
		971	*/
		972	png_byte scal_unit; /* unit of physical scale */
		973	#ifdef PNG_FLOATING_POINT_SUPPORTED
		974	double scal_pixel_width; /* width of one pixel */
		975	double scal_pixel_height; /* height of one pixel */
		976	#endif
		977	#ifdef PNG_FIXED_POINT_SUPPORTED
		978	png_charp scal_s_width; /* string containing height */
		979	png_charp scal_s_height; /* string containing width */
		980	#endif
		981	#endif
		982
		983	#if defined(PNG_INFO_IMAGE_SUPPORTED)
		984	/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
		985	/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
		986	png_bytepp row_pointers; /* the image bits */
		987	#endif
		988
		989	#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
		990	png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
		991	#endif
		992
		993	#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
		994	png_fixed_point int_x_white;
		995	png_fixed_point int_y_white;
		996	png_fixed_point int_x_red;
		997	png_fixed_point int_y_red;
		998	png_fixed_point int_x_green;
		999	png_fixed_point int_y_green;
		1000	png_fixed_point int_x_blue;
		1001	png_fixed_point int_y_blue;
		1002	#endif
		1003
		1004	} png_info;
		1005
		1006	typedef png_info FAR * png_infop;
		1007	typedef png_info FAR * FAR * png_infopp;
		1008
		1009	/* Maximum positive integer used in PNG is (2^31)-1 */
		1010	#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
		1011	#define PNG_UINT_32_MAX ((png_uint_32)(-1))
		1012	#define PNG_SIZE_MAX ((png_size_t)(-1))
		1013	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		1014	/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
		1015	#define PNG_MAX_UINT PNG_UINT_31_MAX
		1016	#endif
		1017
		1018	/* These describe the color_type field in png_info. */
		1019	/* color type masks */
		1020	#define PNG_COLOR_MASK_PALETTE 1
		1021	#define PNG_COLOR_MASK_COLOR 2
		1022	#define PNG_COLOR_MASK_ALPHA 4
		1023
		1024	/* color types. Note that not all combinations are legal */
		1025	#define PNG_COLOR_TYPE_GRAY 0
		1026	#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR \| PNG_COLOR_MASK_PALETTE)
		1027	#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
		1028	#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR \| PNG_COLOR_MASK_ALPHA)
		1029	#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
		1030	/* aliases */
		1031	#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
		1032	#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
		1033
		1034	/* This is for compression type. PNG 1.0-1.2 only define the single type. */
		1035	#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
		1036	#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
		1037
		1038	/* This is for filter type. PNG 1.0-1.2 only define the single type. */
		1039	#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
		1040	#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
		1041	#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
		1042
		1043	/* These are for the interlacing type. These values should NOT be changed. */
		1044	#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
		1045	#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
		1046	#define PNG_INTERLACE_LAST 2 /* Not a valid value */
		1047
		1048	/* These are for the oFFs chunk. These values should NOT be changed. */
		1049	#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
		1050	#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
		1051	#define PNG_OFFSET_LAST 2 /* Not a valid value */
		1052
		1053	/* These are for the pCAL chunk. These values should NOT be changed. */
		1054	#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
		1055	#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
		1056	#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
		1057	#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
		1058	#define PNG_EQUATION_LAST 4 /* Not a valid value */
		1059
		1060	/* These are for the sCAL chunk. These values should NOT be changed. */
		1061	#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
		1062	#define PNG_SCALE_METER 1 /* meters per pixel */
		1063	#define PNG_SCALE_RADIAN 2 /* radians per pixel */
		1064	#define PNG_SCALE_LAST 3 /* Not a valid value */
		1065
		1066	/* These are for the pHYs chunk. These values should NOT be changed. */
		1067	#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
		1068	#define PNG_RESOLUTION_METER 1 /* pixels/meter */
		1069	#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
		1070
		1071	/* These are for the sRGB chunk. These values should NOT be changed. */
		1072	#define PNG_sRGB_INTENT_PERCEPTUAL 0
		1073	#define PNG_sRGB_INTENT_RELATIVE 1
		1074	#define PNG_sRGB_INTENT_SATURATION 2
		1075	#define PNG_sRGB_INTENT_ABSOLUTE 3
		1076	#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
		1077
		1078	/* This is for text chunks */
		1079	#define PNG_KEYWORD_MAX_LENGTH 79
		1080
		1081	/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
		1082	#define PNG_MAX_PALETTE_LENGTH 256
		1083
		1084	/* These determine if an ancillary chunk's data has been successfully read
		1085	* from the PNG header, or if the application has filled in the corresponding
		1086	* data in the info_struct to be written into the output file. The values
		1087	* of the PNG_INFO_<chunk> defines should NOT be changed.
		1088	*/
		1089	#define PNG_INFO_gAMA 0x0001
		1090	#define PNG_INFO_sBIT 0x0002
		1091	#define PNG_INFO_cHRM 0x0004
		1092	#define PNG_INFO_PLTE 0x0008
		1093	#define PNG_INFO_tRNS 0x0010
		1094	#define PNG_INFO_bKGD 0x0020
		1095	#define PNG_INFO_hIST 0x0040
		1096	#define PNG_INFO_pHYs 0x0080
		1097	#define PNG_INFO_oFFs 0x0100
		1098	#define PNG_INFO_tIME 0x0200
		1099	#define PNG_INFO_pCAL 0x0400
		1100	#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
		1101	#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
		1102	#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
		1103	#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
		1104	#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
		1105
		1106	/* This is used for the transformation routines, as some of them
		1107	* change these values for the row. It also should enable using
		1108	* the routines for other purposes.
		1109	*/
		1110	typedef struct png_row_info_struct
		1111	{
		1112	png_uint_32 width; /* width of row */
		1113	png_uint_32 rowbytes; /* number of bytes in row */
		1114	png_byte color_type; /* color type of row */
		1115	png_byte bit_depth; /* bit depth of row */
		1116	png_byte channels; /* number of channels (1, 2, 3, or 4) */
		1117	png_byte pixel_depth; /* bits per pixel (depth * channels) */
		1118	} png_row_info;
		1119
		1120	typedef png_row_info FAR * png_row_infop;
		1121	typedef png_row_info FAR * FAR * png_row_infopp;
		1122
		1123	/* These are the function types for the I/O functions and for the functions
		1124	* that allow the user to override the default I/O functions with his or her
		1125	* own. The png_error_ptr type should match that of user-supplied warning
		1126	* and error functions, while the png_rw_ptr type should match that of the
		1127	* user read/write data functions.
		1128	*/
		1129	typedef struct png_struct_def png_struct;
		1130	typedef png_struct FAR * png_structp;
		1131
		1132	typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
		1133	typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
		1134	typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
		1135	typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
		1136	int));
		1137	typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
		1138	int));
		1139
		1140	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		1141	typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
		1142	typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
		1143	typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
		1144	png_uint_32, int));
		1145	#endif
		1146
		1147	#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) \|\| \
		1148	defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) \|\| \
		1149	defined(PNG_LEGACY_SUPPORTED)
		1150	typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
		1151	png_row_infop, png_bytep));
		1152	#endif
		1153
		1154	#if defined(PNG_USER_CHUNKS_SUPPORTED)
		1155	typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
		1156	#endif
		1157	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		1158	typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
		1159	#endif
		1160
		1161	/* Transform masks for the high-level interface */
		1162	#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
		1163	#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
		1164	#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
		1165	#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
		1166	#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
		1167	#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
		1168	#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
		1169	#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
		1170	#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
		1171	#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
		1172	#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
		1173	#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
		1174	#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */
		1175	/* Added to libpng-1.2.34 */
		1176	#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */
		1177	#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */
		1178
		1179	/* Flags for MNG supported features */
		1180	#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
		1181	#define PNG_FLAG_MNG_FILTER_64 0x04
		1182	#define PNG_ALL_MNG_FEATURES 0x05
		1183
		1184	typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
		1185	typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
		1186
		1187	/* The structure that holds the information to read and write PNG files.
		1188	* The only people who need to care about what is inside of this are the
		1189	* people who will be modifying the library for their own special needs.
		1190	* It should NOT be accessed directly by an application, except to store
		1191	* the jmp_buf.
		1192	*/
		1193
		1194	struct png_struct_def
		1195	{
		1196	#ifdef PNG_SETJMP_SUPPORTED
		1197	jmp_buf jmpbuf; /* used in png_error */
		1198	#endif
		1199	png_error_ptr error_fn; /* function for printing errors and aborting */
		1200	png_error_ptr warning_fn; /* function for printing warnings */
		1201	png_voidp error_ptr; /* user supplied struct for error functions */
		1202	png_rw_ptr write_data_fn; /* function for writing output data */
		1203	png_rw_ptr read_data_fn; /* function for reading input data */
		1204	png_voidp io_ptr; /* ptr to application struct for I/O functions */
		1205
		1206	#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
		1207	png_user_transform_ptr read_user_transform_fn; /* user read transform */
		1208	#endif
		1209
		1210	#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
		1211	png_user_transform_ptr write_user_transform_fn; /* user write transform */
		1212	#endif
		1213
		1214	/* These were added in libpng-1.0.2 */
		1215	#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
		1216	#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) \|\| \
		1217	defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
		1218	png_voidp user_transform_ptr; /* user supplied struct for user transform */
		1219	png_byte user_transform_depth; /* bit depth of user transformed pixels */
		1220	png_byte user_transform_channels; /* channels in user transformed pixels */
		1221	#endif
		1222	#endif
		1223
		1224	png_uint_32 mode; /* tells us where we are in the PNG file */
		1225	png_uint_32 flags; /* flags indicating various things to libpng */
		1226	png_uint_32 transformations; /* which transformations to perform */
		1227
		1228	z_stream zstream; /* pointer to decompression structure (below) */
		1229	png_bytep zbuf; /* buffer for zlib */
		1230	png_size_t zbuf_size; /* size of zbuf */
		1231	int zlib_level; /* holds zlib compression level */
		1232	int zlib_method; /* holds zlib compression method */
		1233	int zlib_window_bits; /* holds zlib compression window bits */
		1234	int zlib_mem_level; /* holds zlib compression memory level */
		1235	int zlib_strategy; /* holds zlib compression strategy */
		1236
		1237	png_uint_32 width; /* width of image in pixels */
		1238	png_uint_32 height; /* height of image in pixels */
		1239	png_uint_32 num_rows; /* number of rows in current pass */
		1240	png_uint_32 usr_width; /* width of row at start of write */
		1241	png_uint_32 rowbytes; /* size of row in bytes */
		1242	png_uint_32 irowbytes; /* size of current interlaced row in bytes */
		1243	png_uint_32 iwidth; /* width of current interlaced row in pixels */
		1244	png_uint_32 row_number; /* current row in interlace pass */
		1245	png_bytep prev_row; /* buffer to save previous (unfiltered) row */
		1246	png_bytep row_buf; /* buffer to save current (unfiltered) row */
		1247	#ifndef PNG_NO_WRITE_FILTER
		1248	png_bytep sub_row; /* buffer to save "sub" row when filtering */
		1249	png_bytep up_row; /* buffer to save "up" row when filtering */
		1250	png_bytep avg_row; /* buffer to save "avg" row when filtering */
		1251	png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
		1252	#endif
		1253	png_row_info row_info; /* used for transformation routines */
		1254
		1255	png_uint_32 idat_size; /* current IDAT size for read */
		1256	png_uint_32 crc; /* current chunk CRC value */
		1257	png_colorp palette; /* palette from the input file */
		1258	png_uint_16 num_palette; /* number of color entries in palette */
		1259	png_uint_16 num_trans; /* number of transparency values */
		1260	png_byte chunk_name[5]; /* null-terminated name of current chunk */
		1261	png_byte compression; /* file compression type (always 0) */
		1262	png_byte filter; /* file filter type (always 0) */
		1263	png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
		1264	png_byte pass; /* current interlace pass (0 - 6) */
		1265	png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
		1266	png_byte color_type; /* color type of file */
		1267	png_byte bit_depth; /* bit depth of file */
		1268	png_byte usr_bit_depth; /* bit depth of users row */
		1269	png_byte pixel_depth; /* number of bits per pixel */
		1270	png_byte channels; /* number of channels in file */
		1271	png_byte usr_channels; /* channels at start of write */
		1272	png_byte sig_bytes; /* magic bytes read/written from start of file */
		1273
		1274	#if defined(PNG_READ_FILLER_SUPPORTED) \|\| defined(PNG_WRITE_FILLER_SUPPORTED)
		1275	#ifdef PNG_LEGACY_SUPPORTED
		1276	png_byte filler; /* filler byte for pixel expansion */
		1277	#else
		1278	png_uint_16 filler; /* filler bytes for pixel expansion */
		1279	#endif
		1280	#endif
		1281
		1282	#if defined(PNG_bKGD_SUPPORTED)
		1283	png_byte background_gamma_type;
		1284	# ifdef PNG_FLOATING_POINT_SUPPORTED
		1285	float background_gamma;
		1286	# endif
		1287	png_color_16 background; /* background color in screen gamma space */
		1288	#if defined(PNG_READ_GAMMA_SUPPORTED)
		1289	png_color_16 background_1; /* background normalized to gamma 1.0 */
		1290	#endif
		1291	#endif /* PNG_bKGD_SUPPORTED */
		1292
		1293	#if defined(PNG_WRITE_FLUSH_SUPPORTED)
		1294	png_flush_ptr output_flush_fn;/* Function for flushing output */
		1295	png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
		1296	png_uint_32 flush_rows; /* number of rows written since last flush */
		1297	#endif
		1298
		1299	#if defined(PNG_READ_GAMMA_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED)
		1300	int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
		1301	#ifdef PNG_FLOATING_POINT_SUPPORTED
		1302	float gamma; /* file gamma value */
		1303	float screen_gamma; /* screen gamma value (display_exponent) */
		1304	#endif
		1305	#endif
		1306
		1307	#if defined(PNG_READ_GAMMA_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED)
		1308	png_bytep gamma_table; /* gamma table for 8-bit depth files */
		1309	png_bytep gamma_from_1; /* converts from 1.0 to screen */
		1310	png_bytep gamma_to_1; /* converts from file to 1.0 */
		1311	png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
		1312	png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
		1313	png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
		1314	#endif
		1315
		1316	#if defined(PNG_READ_GAMMA_SUPPORTED) \|\| defined(PNG_sBIT_SUPPORTED)
		1317	png_color_8 sig_bit; /* significant bits in each available channel */
		1318	#endif
		1319
		1320	#if defined(PNG_READ_SHIFT_SUPPORTED) \|\| defined(PNG_WRITE_SHIFT_SUPPORTED)
		1321	png_color_8 shift; /* shift for significant bit tranformation */
		1322	#endif
		1323
		1324	#if defined(PNG_tRNS_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED) \
		1325	\|\| defined(PNG_READ_EXPAND_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED)
		1326	png_bytep trans; /* transparency values for paletted files */
		1327	png_color_16 trans_values; /* transparency values for non-paletted files */
		1328	#endif
		1329
		1330	png_read_status_ptr read_row_fn; /* called after each row is decoded */
		1331	png_write_status_ptr write_row_fn; /* called after each row is encoded */
		1332	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		1333	png_progressive_info_ptr info_fn; /* called after header data fully read */
		1334	png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
		1335	png_progressive_end_ptr end_fn; /* called after image is complete */
		1336	png_bytep save_buffer_ptr; /* current location in save_buffer */
		1337	png_bytep save_buffer; /* buffer for previously read data */
		1338	png_bytep current_buffer_ptr; /* current location in current_buffer */
		1339	png_bytep current_buffer; /* buffer for recently used data */
		1340	png_uint_32 push_length; /* size of current input chunk */
		1341	png_uint_32 skip_length; /* bytes to skip in input data */
		1342	png_size_t save_buffer_size; /* amount of data now in save_buffer */
		1343	png_size_t save_buffer_max; /* total size of save_buffer */
		1344	png_size_t buffer_size; /* total amount of available input data */
		1345	png_size_t current_buffer_size; /* amount of data now in current_buffer */
		1346	int process_mode; /* what push library is currently doing */
		1347	int cur_palette; /* current push library palette index */
		1348
		1349	# if defined(PNG_TEXT_SUPPORTED)
		1350	png_size_t current_text_size; /* current size of text input data */
		1351	png_size_t current_text_left; /* how much text left to read in input */
		1352	png_charp current_text; /* current text chunk buffer */
		1353	png_charp current_text_ptr; /* current location in current_text */
		1354	# endif /* PNG_TEXT_SUPPORTED */
		1355	#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
		1356
		1357	#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
		1358	/* for the Borland special 64K segment handler */
		1359	png_bytepp offset_table_ptr;
		1360	png_bytep offset_table;
		1361	png_uint_16 offset_table_number;
		1362	png_uint_16 offset_table_count;
		1363	png_uint_16 offset_table_count_free;
		1364	#endif
		1365
		1366	#if defined(PNG_READ_DITHER_SUPPORTED)
		1367	png_bytep palette_lookup; /* lookup table for dithering */
		1368	png_bytep dither_index; /* index translation for palette files */
		1369	#endif
		1370
		1371	#if defined(PNG_READ_DITHER_SUPPORTED) \|\| defined(PNG_hIST_SUPPORTED)
		1372	png_uint_16p hist; /* histogram */
		1373	#endif
		1374
		1375	#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
		1376	png_byte heuristic_method; /* heuristic for row filter selection */
		1377	png_byte num_prev_filters; /* number of weights for previous rows */
		1378	png_bytep prev_filters; /* filter type(s) of previous row(s) */
		1379	png_uint_16p filter_weights; /* weight(s) for previous line(s) */
		1380	png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
		1381	png_uint_16p filter_costs; /* relative filter calculation cost */
		1382	png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
		1383	#endif
		1384
		1385	#if defined(PNG_TIME_RFC1123_SUPPORTED)
		1386	png_charp time_buffer; /* String to hold RFC 1123 time text */
		1387	#endif
		1388
		1389	/* New members added in libpng-1.0.6 */
		1390
		1391	#ifdef PNG_FREE_ME_SUPPORTED
		1392	png_uint_32 free_me; /* flags items libpng is responsible for freeing */
		1393	#endif
		1394
		1395	#if defined(PNG_USER_CHUNKS_SUPPORTED)
		1396	png_voidp user_chunk_ptr;
		1397	png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
		1398	#endif
		1399
		1400	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		1401	int num_chunk_list;
		1402	png_bytep chunk_list;
		1403	#endif
		1404
		1405	/* New members added in libpng-1.0.3 */
		1406	#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
		1407	png_byte rgb_to_gray_status;
		1408	/* These were changed from png_byte in libpng-1.0.6 */
		1409	png_uint_16 rgb_to_gray_red_coeff;
		1410	png_uint_16 rgb_to_gray_green_coeff;
		1411	png_uint_16 rgb_to_gray_blue_coeff;
		1412	#endif
		1413
		1414	/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
		1415	#if defined(PNG_MNG_FEATURES_SUPPORTED) \|\| \
		1416	defined(PNG_READ_EMPTY_PLTE_SUPPORTED) \|\| \
		1417	defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
		1418	/* changed from png_byte to png_uint_32 at version 1.2.0 */
		1419	#ifdef PNG_1_0_X
		1420	png_byte mng_features_permitted;
		1421	#else
		1422	png_uint_32 mng_features_permitted;
		1423	#endif /* PNG_1_0_X */
		1424	#endif
		1425
		1426	/* New member added in libpng-1.0.7 */
		1427	#if defined(PNG_READ_GAMMA_SUPPORTED) \|\| defined(PNG_READ_BACKGROUND_SUPPORTED)
		1428	png_fixed_point int_gamma;
		1429	#endif
		1430
		1431	/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
		1432	#if defined(PNG_MNG_FEATURES_SUPPORTED)
		1433	png_byte filter_type;
		1434	#endif
		1435
		1436	#if defined(PNG_1_0_X)
		1437	/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
		1438	png_uint_32 row_buf_size;
		1439	#endif
		1440
		1441	/* New members added in libpng-1.2.0 */
		1442	#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
		1443	# if !defined(PNG_1_0_X)
		1444	# if defined(PNG_MMX_CODE_SUPPORTED)
		1445	png_byte mmx_bitdepth_threshold;
		1446	png_uint_32 mmx_rowbytes_threshold;
		1447	# endif
		1448	png_uint_32 asm_flags;
		1449	# endif
		1450	#endif
		1451
		1452	/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
		1453	#ifdef PNG_USER_MEM_SUPPORTED
		1454	png_voidp mem_ptr; /* user supplied struct for mem functions */
		1455	png_malloc_ptr malloc_fn; /* function for allocating memory */
		1456	png_free_ptr free_fn; /* function for freeing memory */
		1457	#endif
		1458
		1459	/* New member added in libpng-1.0.13 and 1.2.0 */
		1460	png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
		1461
		1462	#if defined(PNG_READ_DITHER_SUPPORTED)
		1463	/* The following three members were added at version 1.0.14 and 1.2.4 */
		1464	png_bytep dither_sort; /* working sort array */
		1465	png_bytep index_to_palette; /* where the original index currently is */
		1466	/* in the palette */
		1467	png_bytep palette_to_index; /* which original index points to this */
		1468	/* palette color */
		1469	#endif
		1470
		1471	/* New members added in libpng-1.0.16 and 1.2.6 */
		1472	png_byte compression_type;
		1473
		1474	#ifdef PNG_SET_USER_LIMITS_SUPPORTED
		1475	png_uint_32 user_width_max;
		1476	png_uint_32 user_height_max;
		1477	#endif
		1478
		1479	/* New member added in libpng-1.0.25 and 1.2.17 */
		1480	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		1481	/* storage for unknown chunk that the library doesn't recognize. */
		1482	png_unknown_chunk unknown_chunk;
		1483	#endif
		1484
		1485	/* New members added in libpng-1.2.26 */
		1486	png_uint_32 old_big_row_buf_size, old_prev_row_size;
		1487
		1488	/* New member added in libpng-1.2.30 */
		1489	png_charp chunkdata; /* buffer for reading chunk data */
		1490
		1491	};
		1492
		1493
		1494	/* This triggers a compiler error in png.c, if png.c and png.h
		1495	* do not agree upon the version number.
		1496	*/
		1497	typedef png_structp version_1_2_37;
		1498
		1499	typedef png_struct FAR * FAR * png_structpp;
		1500
		1501	/* Here are the function definitions most commonly used. This is not
		1502	* the place to find out how to use libpng. See libpng.txt for the
		1503	* full explanation, see example.c for the summary. This just provides
		1504	* a simple one line description of the use of each function.
		1505	*/
		1506
		1507	/* Returns the version number of the library */
		1508	extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
		1509
		1510	/* Tell lib we have already handled the first <num_bytes> magic bytes.
		1511	* Handling more than 8 bytes from the beginning of the file is an error.
		1512	*/
		1513	extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
		1514	int num_bytes));
		1515
		1516	/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
		1517	* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
		1518	* signature, and non-zero otherwise. Having num_to_check == 0 or
		1519	* start > 7 will always fail (ie return non-zero).
		1520	*/
		1521	extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
		1522	png_size_t num_to_check));
		1523
		1524	/* Simple signature checking function. This is the same as calling
		1525	* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
		1526	*/
		1527	extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
		1528
		1529	/* Allocate and initialize png_ptr struct for reading, and any other memory. */
		1530	extern PNG_EXPORT(png_structp,png_create_read_struct)
		1531	PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
		1532	png_error_ptr error_fn, png_error_ptr warn_fn));
		1533
		1534	/* Allocate and initialize png_ptr struct for writing, and any other memory */
		1535	extern PNG_EXPORT(png_structp,png_create_write_struct)
		1536	PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
		1537	png_error_ptr error_fn, png_error_ptr warn_fn));
		1538
		1539	#ifdef PNG_WRITE_SUPPORTED
		1540	extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
		1541	PNGARG((png_structp png_ptr));
		1542	#endif
		1543
		1544	#ifdef PNG_WRITE_SUPPORTED
		1545	extern PNG_EXPORT(void,png_set_compression_buffer_size)
		1546	PNGARG((png_structp png_ptr, png_uint_32 size));
		1547	#endif
		1548
		1549	/* Reset the compression stream */
		1550	extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
		1551
		1552	/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
		1553	#ifdef PNG_USER_MEM_SUPPORTED
		1554	extern PNG_EXPORT(png_structp,png_create_read_struct_2)
		1555	PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
		1556	png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
		1557	png_malloc_ptr malloc_fn, png_free_ptr free_fn));
		1558	extern PNG_EXPORT(png_structp,png_create_write_struct_2)
		1559	PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
		1560	png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
		1561	png_malloc_ptr malloc_fn, png_free_ptr free_fn));
		1562	#endif
		1563
		1564	/* Write a PNG chunk - size, type, (optional) data, CRC. */
		1565	extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
		1566	png_bytep chunk_name, png_bytep data, png_size_t length));
		1567
		1568	/* Write the start of a PNG chunk - length and chunk name. */
		1569	extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
		1570	png_bytep chunk_name, png_uint_32 length));
		1571
		1572	/* Write the data of a PNG chunk started with png_write_chunk_start(). */
		1573	extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
		1574	png_bytep data, png_size_t length));
		1575
		1576	/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
		1577	extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
		1578
		1579	/* Allocate and initialize the info structure */
		1580	extern PNG_EXPORT(png_infop,png_create_info_struct)
		1581	PNGARG((png_structp png_ptr));
		1582
		1583	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		1584	/* Initialize the info structure (old interface - DEPRECATED) */
		1585	extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
		1586	#undef png_info_init
		1587	#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
		1588	png_sizeof(png_info));
		1589	#endif
		1590
		1591	extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
		1592	png_size_t png_info_struct_size));
		1593
		1594	/* Writes all the PNG information before the image. */
		1595	extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
		1596	png_infop info_ptr));
		1597	extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
		1598	png_infop info_ptr));
		1599
		1600	#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
		1601	/* read the information before the actual image data. */
		1602	extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
		1603	png_infop info_ptr));
		1604	#endif
		1605
		1606	#if defined(PNG_TIME_RFC1123_SUPPORTED)
		1607	extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
		1608	PNGARG((png_structp png_ptr, png_timep ptime));
		1609	#endif
		1610
		1611	#if !defined(_WIN32_WCE)
		1612	/* "time.h" functions are not supported on WindowsCE */
		1613	#if defined(PNG_WRITE_tIME_SUPPORTED)
		1614	/* convert from a struct tm to png_time */
		1615	extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
		1616	struct tm FAR * ttime));
		1617
		1618	/* convert from time_t to png_time. Uses gmtime() */
		1619	extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
		1620	time_t ttime));
		1621	#endif /* PNG_WRITE_tIME_SUPPORTED */
		1622	#endif /* _WIN32_WCE */
		1623
		1624	#if defined(PNG_READ_EXPAND_SUPPORTED)
		1625	/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
		1626	extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
		1627	#if !defined(PNG_1_0_X)
		1628	extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
		1629	png_ptr));
		1630	#endif
		1631	extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
		1632	extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
		1633	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		1634	/* Deprecated */
		1635	extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
		1636	#endif
		1637	#endif
		1638
		1639	#if defined(PNG_READ_BGR_SUPPORTED) \|\| defined(PNG_WRITE_BGR_SUPPORTED)
		1640	/* Use blue, green, red order for pixels. */
		1641	extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
		1642	#endif
		1643
		1644	#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
		1645	/* Expand the grayscale to 24-bit RGB if necessary. */
		1646	extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
		1647	#endif
		1648
		1649	#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
		1650	/* Reduce RGB to grayscale. */
		1651	#ifdef PNG_FLOATING_POINT_SUPPORTED
		1652	extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
		1653	int error_action, double red, double green ));
		1654	#endif
		1655	extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
		1656	int error_action, png_fixed_point red, png_fixed_point green ));
		1657	extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
		1658	png_ptr));
		1659	#endif
		1660
		1661	extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
		1662	png_colorp palette));
		1663
		1664	#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
		1665	extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
		1666	#endif
		1667
		1668	#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) \|\| \
		1669	defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
		1670	extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
		1671	#endif
		1672
		1673	#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) \|\| \
		1674	defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
		1675	extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
		1676	#endif
		1677
		1678	#if defined(PNG_READ_FILLER_SUPPORTED) \|\| defined(PNG_WRITE_FILLER_SUPPORTED)
		1679	/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
		1680	extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
		1681	png_uint_32 filler, int flags));
		1682	/* The values of the PNG_FILLER_ defines should NOT be changed */
		1683	#define PNG_FILLER_BEFORE 0
		1684	#define PNG_FILLER_AFTER 1
		1685	/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
		1686	#if !defined(PNG_1_0_X)
		1687	extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
		1688	png_uint_32 filler, int flags));
		1689	#endif
		1690	#endif /* PNG_READ_FILLER_SUPPORTED \|\| PNG_WRITE_FILLER_SUPPORTED */
		1691
		1692	#if defined(PNG_READ_SWAP_SUPPORTED) \|\| defined(PNG_WRITE_SWAP_SUPPORTED)
		1693	/* Swap bytes in 16-bit depth files. */
		1694	extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
		1695	#endif
		1696
		1697	#if defined(PNG_READ_PACK_SUPPORTED) \|\| defined(PNG_WRITE_PACK_SUPPORTED)
		1698	/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
		1699	extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
		1700	#endif
		1701
		1702	#if defined(PNG_READ_PACKSWAP_SUPPORTED) \|\| defined(PNG_WRITE_PACKSWAP_SUPPORTED)
		1703	/* Swap packing order of pixels in bytes. */
		1704	extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
		1705	#endif
		1706
		1707	#if defined(PNG_READ_SHIFT_SUPPORTED) \|\| defined(PNG_WRITE_SHIFT_SUPPORTED)
		1708	/* Converts files to legal bit depths. */
		1709	extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
		1710	png_color_8p true_bits));
		1711	#endif
		1712
		1713	#if defined(PNG_READ_INTERLACING_SUPPORTED) \|\| \
		1714	defined(PNG_WRITE_INTERLACING_SUPPORTED)
		1715	/* Have the code handle the interlacing. Returns the number of passes. */
		1716	extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
		1717	#endif
		1718
		1719	#if defined(PNG_READ_INVERT_SUPPORTED) \|\| defined(PNG_WRITE_INVERT_SUPPORTED)
		1720	/* Invert monochrome files */
		1721	extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
		1722	#endif
		1723
		1724	#if defined(PNG_READ_BACKGROUND_SUPPORTED)
		1725	/* Handle alpha and tRNS by replacing with a background color. */
		1726	#ifdef PNG_FLOATING_POINT_SUPPORTED
		1727	extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
		1728	png_color_16p background_color, int background_gamma_code,
		1729	int need_expand, double background_gamma));
		1730	#endif
		1731	#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
		1732	#define PNG_BACKGROUND_GAMMA_SCREEN 1
		1733	#define PNG_BACKGROUND_GAMMA_FILE 2
		1734	#define PNG_BACKGROUND_GAMMA_UNIQUE 3
		1735	#endif
		1736
		1737	#if defined(PNG_READ_16_TO_8_SUPPORTED)
		1738	/* strip the second byte of information from a 16-bit depth file. */
		1739	extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
		1740	#endif
		1741
		1742	#if defined(PNG_READ_DITHER_SUPPORTED)
		1743	/* Turn on dithering, and reduce the palette to the number of colors available. */
		1744	extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
		1745	png_colorp palette, int num_palette, int maximum_colors,
		1746	png_uint_16p histogram, int full_dither));
		1747	#endif
		1748
		1749	#if defined(PNG_READ_GAMMA_SUPPORTED)
		1750	/* Handle gamma correction. Screen_gamma=(display_exponent) */
		1751	#ifdef PNG_FLOATING_POINT_SUPPORTED
		1752	extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
		1753	double screen_gamma, double default_file_gamma));
		1754	#endif
		1755	#endif
		1756
		1757	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		1758	#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) \|\| \
		1759	defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
		1760	/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
		1761	/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
		1762	extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
		1763	int empty_plte_permitted));
		1764	#endif
		1765	#endif
		1766
		1767	#if defined(PNG_WRITE_FLUSH_SUPPORTED)
		1768	/* Set how many lines between output flushes - 0 for no flushing */
		1769	extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
		1770	/* Flush the current PNG output buffer */
		1771	extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
		1772	#endif
		1773
		1774	/* optional update palette with requested transformations */
		1775	extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
		1776
		1777	/* optional call to update the users info structure */
		1778	extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
		1779	png_infop info_ptr));
		1780
		1781	#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
		1782	/* read one or more rows of image data. */
		1783	extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
		1784	png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
		1785	#endif
		1786
		1787	#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
		1788	/* read a row of data. */
		1789	extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
		1790	png_bytep row,
		1791	png_bytep display_row));
		1792	#endif
		1793
		1794	#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
		1795	/* read the whole image into memory at once. */
		1796	extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
		1797	png_bytepp image));
		1798	#endif
		1799
		1800	/* write a row of image data */
		1801	extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
		1802	png_bytep row));
		1803
		1804	/* write a few rows of image data */
		1805	extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
		1806	png_bytepp row, png_uint_32 num_rows));
		1807
		1808	/* write the image data */
		1809	extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
		1810	png_bytepp image));
		1811
		1812	/* writes the end of the PNG file. */
		1813	extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
		1814	png_infop info_ptr));
		1815
		1816	#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
		1817	/* read the end of the PNG file. */
		1818	extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
		1819	png_infop info_ptr));
		1820	#endif
		1821
		1822	/* free any memory associated with the png_info_struct */
		1823	extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
		1824	png_infopp info_ptr_ptr));
		1825
		1826	/* free any memory associated with the png_struct and the png_info_structs */
		1827	extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
		1828	png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
		1829
		1830	/* free all memory used by the read (old method - NOT DLL EXPORTED) */
		1831	extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
		1832	png_infop end_info_ptr));
		1833
		1834	/* free any memory associated with the png_struct and the png_info_structs */
		1835	extern PNG_EXPORT(void,png_destroy_write_struct)
		1836	PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
		1837
		1838	/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
		1839	extern void png_write_destroy PNGARG((png_structp png_ptr));
		1840
		1841	/* set the libpng method of handling chunk CRC errors */
		1842	extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
		1843	int crit_action, int ancil_action));
		1844
		1845	/* Values for png_set_crc_action() to say how to handle CRC errors in
		1846	* ancillary and critical chunks, and whether to use the data contained
		1847	* therein. Note that it is impossible to "discard" data in a critical
		1848	* chunk. For versions prior to 0.90, the action was always error/quit,
		1849	* whereas in version 0.90 and later, the action for CRC errors in ancillary
		1850	* chunks is warn/discard. These values should NOT be changed.
		1851	*
		1852	* value action:critical action:ancillary
		1853	*/
		1854	#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
		1855	#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
		1856	#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
		1857	#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
		1858	#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
		1859	#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
		1860
		1861	/* These functions give the user control over the scan-line filtering in
		1862	* libpng and the compression methods used by zlib. These functions are
		1863	* mainly useful for testing, as the defaults should work with most users.
		1864	* Those users who are tight on memory or want faster performance at the
		1865	* expense of compression can modify them. See the compression library
		1866	* header file (zlib.h) for an explination of the compression functions.
		1867	*/
		1868
		1869	/* set the filtering method(s) used by libpng. Currently, the only valid
		1870	* value for "method" is 0.
		1871	*/
		1872	extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
		1873	int filters));
		1874
		1875	/* Flags for png_set_filter() to say which filters to use. The flags
		1876	* are chosen so that they don't conflict with real filter types
		1877	* below, in case they are supplied instead of the #defined constants.
		1878	* These values should NOT be changed.
		1879	*/
		1880	#define PNG_NO_FILTERS 0x00
		1881	#define PNG_FILTER_NONE 0x08
		1882	#define PNG_FILTER_SUB 0x10
		1883	#define PNG_FILTER_UP 0x20
		1884	#define PNG_FILTER_AVG 0x40
		1885	#define PNG_FILTER_PAETH 0x80
		1886	#define PNG_ALL_FILTERS (PNG_FILTER_NONE \| PNG_FILTER_SUB \| PNG_FILTER_UP \| \
		1887	PNG_FILTER_AVG \| PNG_FILTER_PAETH)
		1888
		1889	/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
		1890	* These defines should NOT be changed.
		1891	*/
		1892	#define PNG_FILTER_VALUE_NONE 0
		1893	#define PNG_FILTER_VALUE_SUB 1
		1894	#define PNG_FILTER_VALUE_UP 2
		1895	#define PNG_FILTER_VALUE_AVG 3
		1896	#define PNG_FILTER_VALUE_PAETH 4
		1897	#define PNG_FILTER_VALUE_LAST 5
		1898
		1899	#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
		1900	/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
		1901	* defines, either the default (minimum-sum-of-absolute-differences), or
		1902	* the experimental method (weighted-minimum-sum-of-absolute-differences).
		1903	*
		1904	* Weights are factors >= 1.0, indicating how important it is to keep the
		1905	* filter type consistent between rows. Larger numbers mean the current
		1906	* filter is that many times as likely to be the same as the "num_weights"
		1907	* previous filters. This is cumulative for each previous row with a weight.
		1908	* There needs to be "num_weights" values in "filter_weights", or it can be
		1909	* NULL if the weights aren't being specified. Weights have no influence on
		1910	* the selection of the first row filter. Well chosen weights can (in theory)
		1911	* improve the compression for a given image.
		1912	*
		1913	* Costs are factors >= 1.0 indicating the relative decoding costs of a
		1914	* filter type. Higher costs indicate more decoding expense, and are
		1915	* therefore less likely to be selected over a filter with lower computational
		1916	* costs. There needs to be a value in "filter_costs" for each valid filter
		1917	* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
		1918	* setting the costs. Costs try to improve the speed of decompression without
		1919	* unduly increasing the compressed image size.
		1920	*
		1921	* A negative weight or cost indicates the default value is to be used, and
		1922	* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
		1923	* The default values for both weights and costs are currently 1.0, but may
		1924	* change if good general weighting/cost heuristics can be found. If both
		1925	* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
		1926	* to the UNWEIGHTED method, but with added encoding time/computation.
		1927	*/
		1928	#ifdef PNG_FLOATING_POINT_SUPPORTED
		1929	extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
		1930	int heuristic_method, int num_weights, png_doublep filter_weights,
		1931	png_doublep filter_costs));
		1932	#endif
		1933	#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
		1934
		1935	/* Heuristic used for row filter selection. These defines should NOT be
		1936	* changed.
		1937	*/
		1938	#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
		1939	#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
		1940	#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
		1941	#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
		1942
		1943	/* Set the library compression level. Currently, valid values range from
		1944	* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
		1945	* (0 - no compression, 9 - "maximal" compression). Note that tests have
		1946	* shown that zlib compression levels 3-6 usually perform as well as level 9
		1947	* for PNG images, and do considerably fewer caclulations. In the future,
		1948	* these values may not correspond directly to the zlib compression levels.
		1949	*/
		1950	extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
		1951	int level));
		1952
		1953	extern PNG_EXPORT(void,png_set_compression_mem_level)
		1954	PNGARG((png_structp png_ptr, int mem_level));
		1955
		1956	extern PNG_EXPORT(void,png_set_compression_strategy)
		1957	PNGARG((png_structp png_ptr, int strategy));
		1958
		1959	extern PNG_EXPORT(void,png_set_compression_window_bits)
		1960	PNGARG((png_structp png_ptr, int window_bits));
		1961
		1962	extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
		1963	int method));
		1964
		1965	/* These next functions are called for input/output, memory, and error
		1966	* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
		1967	* and call standard C I/O routines such as fread(), fwrite(), and
		1968	* fprintf(). These functions can be made to use other I/O routines
		1969	* at run time for those applications that need to handle I/O in a
		1970	* different manner by calling png_set_???_fn(). See libpng.txt for
		1971	* more information.
		1972	*/
		1973
		1974	#if !defined(PNG_NO_STDIO)
		1975	/* Initialize the input/output for the PNG file to the default functions. */
		1976	extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
		1977	#endif
		1978
		1979	/* Replace the (error and abort), and warning functions with user
		1980	* supplied functions. If no messages are to be printed you must still
		1981	* write and use replacement functions. The replacement error_fn should
		1982	* still do a longjmp to the last setjmp location if you are using this
		1983	* method of error handling. If error_fn or warning_fn is NULL, the
		1984	* default function will be used.
		1985	*/
		1986
		1987	extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
		1988	png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
		1989
		1990	/* Return the user pointer associated with the error functions */
		1991	extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
		1992
		1993	/* Replace the default data output functions with a user supplied one(s).
		1994	* If buffered output is not used, then output_flush_fn can be set to NULL.
		1995	* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
		1996	* output_flush_fn will be ignored (and thus can be NULL).
		1997	* It is probably a mistake to use NULL for output_flush_fn if
		1998	* write_data_fn is not also NULL unless you have built libpng with
		1999	* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
		2000	* default flush function, which uses the standard *FILE structure, will
		2001	* be used.
		2002	*/
		2003	extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
		2004	png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
		2005
		2006	/* Replace the default data input function with a user supplied one. */
		2007	extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
		2008	png_voidp io_ptr, png_rw_ptr read_data_fn));
		2009
		2010	/* Return the user pointer associated with the I/O functions */
		2011	extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
		2012
		2013	extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
		2014	png_read_status_ptr read_row_fn));
		2015
		2016	extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
		2017	png_write_status_ptr write_row_fn));
		2018
		2019	#ifdef PNG_USER_MEM_SUPPORTED
		2020	/* Replace the default memory allocation functions with user supplied one(s). */
		2021	extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
		2022	png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
		2023	/* Return the user pointer associated with the memory functions */
		2024	extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
		2025	#endif
		2026
		2027	#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) \|\| \
		2028	defined(PNG_LEGACY_SUPPORTED)
		2029	extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
		2030	png_ptr, png_user_transform_ptr read_user_transform_fn));
		2031	#endif
		2032
		2033	#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) \|\| \
		2034	defined(PNG_LEGACY_SUPPORTED)
		2035	extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
		2036	png_ptr, png_user_transform_ptr write_user_transform_fn));
		2037	#endif
		2038
		2039	#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) \|\| \
		2040	defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) \|\| \
		2041	defined(PNG_LEGACY_SUPPORTED)
		2042	extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
		2043	png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
		2044	int user_transform_channels));
		2045	/* Return the user pointer associated with the user transform functions */
		2046	extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
		2047	PNGARG((png_structp png_ptr));
		2048	#endif
		2049
		2050	#ifdef PNG_USER_CHUNKS_SUPPORTED
		2051	extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
		2052	png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
		2053	extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
		2054	png_ptr));
		2055	#endif
		2056
		2057	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		2058	/* Sets the function callbacks for the push reader, and a pointer to a
		2059	* user-defined structure available to the callback functions.
		2060	*/
		2061	extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
		2062	png_voidp progressive_ptr,
		2063	png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
		2064	png_progressive_end_ptr end_fn));
		2065
		2066	/* returns the user pointer associated with the push read functions */
		2067	extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
		2068	PNGARG((png_structp png_ptr));
		2069
		2070	/* function to be called when data becomes available */
		2071	extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
		2072	png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
		2073
		2074	/* function that combines rows. Not very much different than the
		2075	* png_combine_row() call. Is this even used?????
		2076	*/
		2077	extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
		2078	png_bytep old_row, png_bytep new_row));
		2079	#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
		2080
		2081	extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
		2082	png_uint_32 size));
		2083
		2084	#if defined(PNG_1_0_X)
		2085	# define png_malloc_warn png_malloc
		2086	#else
		2087	/* Added at libpng version 1.2.4 */
		2088	extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
		2089	png_uint_32 size));
		2090	#endif
		2091
		2092	/* frees a pointer allocated by png_malloc() */
		2093	extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
		2094
		2095	#if defined(PNG_1_0_X)
		2096	/* Function to allocate memory for zlib. */
		2097	extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
		2098	uInt size));
		2099
		2100	/* Function to free memory for zlib */
		2101	extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
		2102	#endif
		2103
		2104	/* Free data that was allocated internally */
		2105	extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
		2106	png_infop info_ptr, png_uint_32 free_me, int num));
		2107	#ifdef PNG_FREE_ME_SUPPORTED
		2108	/* Reassign responsibility for freeing existing data, whether allocated
		2109	* by libpng or by the application */
		2110	extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
		2111	png_infop info_ptr, int freer, png_uint_32 mask));
		2112	#endif
		2113	/* assignments for png_data_freer */
		2114	#define PNG_DESTROY_WILL_FREE_DATA 1
		2115	#define PNG_SET_WILL_FREE_DATA 1
		2116	#define PNG_USER_WILL_FREE_DATA 2
		2117	/* Flags for png_ptr->free_me and info_ptr->free_me */
		2118	#define PNG_FREE_HIST 0x0008
		2119	#define PNG_FREE_ICCP 0x0010
		2120	#define PNG_FREE_SPLT 0x0020
		2121	#define PNG_FREE_ROWS 0x0040
		2122	#define PNG_FREE_PCAL 0x0080
		2123	#define PNG_FREE_SCAL 0x0100
		2124	#define PNG_FREE_UNKN 0x0200
		2125	#define PNG_FREE_LIST 0x0400
		2126	#define PNG_FREE_PLTE 0x1000
		2127	#define PNG_FREE_TRNS 0x2000
		2128	#define PNG_FREE_TEXT 0x4000
		2129	#define PNG_FREE_ALL 0x7fff
		2130	#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT\|PNG_FREE_TEXT\|PNG_FREE_UNKN */
		2131
		2132	#ifdef PNG_USER_MEM_SUPPORTED
		2133	extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
		2134	png_uint_32 size));
		2135	extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
		2136	png_voidp ptr));
		2137	#endif
		2138
		2139	extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
		2140	png_voidp s1, png_voidp s2, png_uint_32 size));
		2141
		2142	extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
		2143	png_voidp s1, int value, png_uint_32 size));
		2144
		2145	#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
		2146	extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
		2147	int check));
		2148	#endif /* USE_FAR_KEYWORD */
		2149
		2150	#ifndef PNG_NO_ERROR_TEXT
		2151	/* Fatal error in PNG image of libpng - can't continue */
		2152	extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
		2153	png_const_charp error_message));
		2154
		2155	/* The same, but the chunk name is prepended to the error string. */
		2156	extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
		2157	png_const_charp error_message));
		2158	#else
		2159	/* Fatal error in PNG image of libpng - can't continue */
		2160	extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
		2161	#endif
		2162
		2163	#ifndef PNG_NO_WARNINGS
		2164	/* Non-fatal error in libpng. Can continue, but may have a problem. */
		2165	extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
		2166	png_const_charp warning_message));
		2167
		2168	#ifdef PNG_READ_SUPPORTED
		2169	/* Non-fatal error in libpng, chunk name is prepended to message. */
		2170	extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
		2171	png_const_charp warning_message));
		2172	#endif /* PNG_READ_SUPPORTED */
		2173	#endif /* PNG_NO_WARNINGS */
		2174
		2175	/* The png_set_<chunk> functions are for storing values in the png_info_struct.
		2176	* Similarly, the png_get_<chunk> calls are used to read values from the
		2177	* png_info_struct, either storing the parameters in the passed variables, or
		2178	* setting pointers into the png_info_struct where the data is stored. The
		2179	* png_get_<chunk> functions return a non-zero value if the data was available
		2180	* in info_ptr, or return zero and do not change any of the parameters if the
		2181	* data was not available.
		2182	*
		2183	* These functions should be used instead of directly accessing png_info
		2184	* to avoid problems with future changes in the size and internal layout of
		2185	* png_info_struct.
		2186	*/
		2187	/* Returns "flag" if chunk data is valid in info_ptr. */
		2188	extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
		2189	png_infop info_ptr, png_uint_32 flag));
		2190
		2191	/* Returns number of bytes needed to hold a transformed row. */
		2192	extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
		2193	png_infop info_ptr));
		2194
		2195	#if defined(PNG_INFO_IMAGE_SUPPORTED)
		2196	/* Returns row_pointers, which is an array of pointers to scanlines that was
		2197	returned from png_read_png(). */
		2198	extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
		2199	png_infop info_ptr));
		2200	/* Set row_pointers, which is an array of pointers to scanlines for use
		2201	by png_write_png(). */
		2202	extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
		2203	png_infop info_ptr, png_bytepp row_pointers));
		2204	#endif
		2205
		2206	/* Returns number of color channels in image. */
		2207	extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
		2208	png_infop info_ptr));
		2209
		2210	#ifdef PNG_EASY_ACCESS_SUPPORTED
		2211	/* Returns image width in pixels. */
		2212	extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
		2213	png_ptr, png_infop info_ptr));
		2214
		2215	/* Returns image height in pixels. */
		2216	extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
		2217	png_ptr, png_infop info_ptr));
		2218
		2219	/* Returns image bit_depth. */
		2220	extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
		2221	png_ptr, png_infop info_ptr));
		2222
		2223	/* Returns image color_type. */
		2224	extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
		2225	png_ptr, png_infop info_ptr));
		2226
		2227	/* Returns image filter_type. */
		2228	extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
		2229	png_ptr, png_infop info_ptr));
		2230
		2231	/* Returns image interlace_type. */
		2232	extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
		2233	png_ptr, png_infop info_ptr));
		2234
		2235	/* Returns image compression_type. */
		2236	extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
		2237	png_ptr, png_infop info_ptr));
		2238
		2239	/* Returns image resolution in pixels per meter, from pHYs chunk data. */
		2240	extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
		2241	png_ptr, png_infop info_ptr));
		2242	extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
		2243	png_ptr, png_infop info_ptr));
		2244	extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
		2245	png_ptr, png_infop info_ptr));
		2246
		2247	/* Returns pixel aspect ratio, computed from pHYs chunk data. */
		2248	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2249	extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
		2250	png_ptr, png_infop info_ptr));
		2251	#endif
		2252
		2253	/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
		2254	extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
		2255	png_ptr, png_infop info_ptr));
		2256	extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
		2257	png_ptr, png_infop info_ptr));
		2258	extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
		2259	png_ptr, png_infop info_ptr));
		2260	extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
		2261	png_ptr, png_infop info_ptr));
		2262
		2263	#endif /* PNG_EASY_ACCESS_SUPPORTED */
		2264
		2265	/* Returns pointer to signature string read from PNG header */
		2266	extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
		2267	png_infop info_ptr));
		2268
		2269	#if defined(PNG_bKGD_SUPPORTED)
		2270	extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
		2271	png_infop info_ptr, png_color_16p *background));
		2272	#endif
		2273
		2274	#if defined(PNG_bKGD_SUPPORTED)
		2275	extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
		2276	png_infop info_ptr, png_color_16p background));
		2277	#endif
		2278
		2279	#if defined(PNG_cHRM_SUPPORTED)
		2280	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2281	extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
		2282	png_infop info_ptr, double white_x, double white_y, double *red_x,
		2283	double red_y, double green_x, double green_y, double blue_x,
		2284	double *blue_y));
		2285	#endif
		2286	#ifdef PNG_FIXED_POINT_SUPPORTED
		2287	extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
		2288	png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
		2289	int_white_y, png_fixed_point int_red_x, png_fixed_point *int_red_y,
		2290	png_fixed_point int_green_x, png_fixed_point int_green_y, png_fixed_point
		2291	int_blue_x, png_fixed_point int_blue_y));
		2292	#endif
		2293	#endif
		2294
		2295	#if defined(PNG_cHRM_SUPPORTED)
		2296	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2297	extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
		2298	png_infop info_ptr, double white_x, double white_y, double red_x,
		2299	double red_y, double green_x, double green_y, double blue_x, double blue_y));
		2300	#endif
		2301	#ifdef PNG_FIXED_POINT_SUPPORTED
		2302	extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
		2303	png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
		2304	png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
		2305	int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
		2306	png_fixed_point int_blue_y));
		2307	#endif
		2308	#endif
		2309
		2310	#if defined(PNG_gAMA_SUPPORTED)
		2311	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2312	extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
		2313	png_infop info_ptr, double *file_gamma));
		2314	#endif
		2315	extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
		2316	png_infop info_ptr, png_fixed_point *int_file_gamma));
		2317	#endif
		2318
		2319	#if defined(PNG_gAMA_SUPPORTED)
		2320	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2321	extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
		2322	png_infop info_ptr, double file_gamma));
		2323	#endif
		2324	extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
		2325	png_infop info_ptr, png_fixed_point int_file_gamma));
		2326	#endif
		2327
		2328	#if defined(PNG_hIST_SUPPORTED)
		2329	extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
		2330	png_infop info_ptr, png_uint_16p *hist));
		2331	#endif
		2332
		2333	#if defined(PNG_hIST_SUPPORTED)
		2334	extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
		2335	png_infop info_ptr, png_uint_16p hist));
		2336	#endif
		2337
		2338	extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
		2339	png_infop info_ptr, png_uint_32 width, png_uint_32 height,
		2340	int bit_depth, int color_type, int *interlace_method,
		2341	int compression_method, int filter_method));
		2342
		2343	extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
		2344	png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
		2345	int color_type, int interlace_method, int compression_method,
		2346	int filter_method));
		2347
		2348	#if defined(PNG_oFFs_SUPPORTED)
		2349	extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
		2350	png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
		2351	int *unit_type));
		2352	#endif
		2353
		2354	#if defined(PNG_oFFs_SUPPORTED)
		2355	extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
		2356	png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
		2357	int unit_type));
		2358	#endif
		2359
		2360	#if defined(PNG_pCAL_SUPPORTED)
		2361	extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
		2362	png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 *X1,
		2363	int type, int nparams, png_charp units, png_charpp params));
		2364	#endif
		2365
		2366	#if defined(PNG_pCAL_SUPPORTED)
		2367	extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
		2368	png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
		2369	int type, int nparams, png_charp units, png_charpp params));
		2370	#endif
		2371
		2372	#if defined(PNG_pHYs_SUPPORTED)
		2373	extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
		2374	png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int *unit_type));
		2375	#endif
		2376
		2377	#if defined(PNG_pHYs_SUPPORTED)
		2378	extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
		2379	png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
		2380	#endif
		2381
		2382	extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
		2383	png_infop info_ptr, png_colorp palette, int num_palette));
		2384
		2385	extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
		2386	png_infop info_ptr, png_colorp palette, int num_palette));
		2387
		2388	#if defined(PNG_sBIT_SUPPORTED)
		2389	extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
		2390	png_infop info_ptr, png_color_8p *sig_bit));
		2391	#endif
		2392
		2393	#if defined(PNG_sBIT_SUPPORTED)
		2394	extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
		2395	png_infop info_ptr, png_color_8p sig_bit));
		2396	#endif
		2397
		2398	#if defined(PNG_sRGB_SUPPORTED)
		2399	extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
		2400	png_infop info_ptr, int *intent));
		2401	#endif
		2402
		2403	#if defined(PNG_sRGB_SUPPORTED)
		2404	extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
		2405	png_infop info_ptr, int intent));
		2406	extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
		2407	png_infop info_ptr, int intent));
		2408	#endif
		2409
		2410	#if defined(PNG_iCCP_SUPPORTED)
		2411	extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
		2412	png_infop info_ptr, png_charpp name, int *compression_type,
		2413	png_charpp profile, png_uint_32 *proflen));
		2414	/* Note to maintainer: profile should be png_bytepp */
		2415	#endif
		2416
		2417	#if defined(PNG_iCCP_SUPPORTED)
		2418	extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
		2419	png_infop info_ptr, png_charp name, int compression_type,
		2420	png_charp profile, png_uint_32 proflen));
		2421	/* Note to maintainer: profile should be png_bytep */
		2422	#endif
		2423
		2424	#if defined(PNG_sPLT_SUPPORTED)
		2425	extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
		2426	png_infop info_ptr, png_sPLT_tpp entries));
		2427	#endif
		2428
		2429	#if defined(PNG_sPLT_SUPPORTED)
		2430	extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
		2431	png_infop info_ptr, png_sPLT_tp entries, int nentries));
		2432	#endif
		2433
		2434	#if defined(PNG_TEXT_SUPPORTED)
		2435	/* png_get_text also returns the number of text chunks in num_text /
		2436	extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
		2437	png_infop info_ptr, png_textp text_ptr, int num_text));
		2438	#endif
		2439
		2440	/*
		2441	* Note while png_set_text() will accept a structure whose text,
		2442	* language, and translated keywords are NULL pointers, the structure
		2443	* returned by png_get_text will always contain regular
		2444	* zero-terminated C strings. They might be empty strings but
		2445	* they will never be NULL pointers.
		2446	*/
		2447
		2448	#if defined(PNG_TEXT_SUPPORTED)
		2449	extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
		2450	png_infop info_ptr, png_textp text_ptr, int num_text));
		2451	#endif
		2452
		2453	#if defined(PNG_tIME_SUPPORTED)
		2454	extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
		2455	png_infop info_ptr, png_timep *mod_time));
		2456	#endif
		2457
		2458	#if defined(PNG_tIME_SUPPORTED)
		2459	extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
		2460	png_infop info_ptr, png_timep mod_time));
		2461	#endif
		2462
		2463	#if defined(PNG_tRNS_SUPPORTED)
		2464	extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
		2465	png_infop info_ptr, png_bytep trans, int num_trans,
		2466	png_color_16p *trans_values));
		2467	#endif
		2468
		2469	#if defined(PNG_tRNS_SUPPORTED)
		2470	extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
		2471	png_infop info_ptr, png_bytep trans, int num_trans,
		2472	png_color_16p trans_values));
		2473	#endif
		2474
		2475	#if defined(PNG_tRNS_SUPPORTED)
		2476	#endif
		2477
		2478	#if defined(PNG_sCAL_SUPPORTED)
		2479	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2480	extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
		2481	png_infop info_ptr, int unit, double width, double *height));
		2482	#else
		2483	#ifdef PNG_FIXED_POINT_SUPPORTED
		2484	extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
		2485	png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
		2486	#endif
		2487	#endif
		2488	#endif /* PNG_sCAL_SUPPORTED */
		2489
		2490	#if defined(PNG_sCAL_SUPPORTED)
		2491	#ifdef PNG_FLOATING_POINT_SUPPORTED
		2492	extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
		2493	png_infop info_ptr, int unit, double width, double height));
		2494	#else
		2495	#ifdef PNG_FIXED_POINT_SUPPORTED
		2496	extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
		2497	png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
		2498	#endif
		2499	#endif
		2500	#endif /* PNG_sCAL_SUPPORTED \|\| PNG_WRITE_sCAL_SUPPORTED */
		2501
		2502	#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
		2503	/* provide a list of chunks and how they are to be handled, if the built-in
		2504	handling or default unknown chunk handling is not desired. Any chunks not
		2505	listed will be handled in the default manner. The IHDR and IEND chunks
		2506	must not be listed.
		2507	keep = 0: follow default behaviour
		2508	= 1: do not keep
		2509	= 2: keep only if safe-to-copy
		2510	= 3: keep even if unsafe-to-copy
		2511	*/
		2512	extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
		2513	png_ptr, int keep, png_bytep chunk_list, int num_chunks));
		2514	extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
		2515	png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
		2516	extern PNG_EXPORT(void, png_set_unknown_chunk_location)
		2517	PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
		2518	extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
		2519	png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
		2520	#endif
		2521	#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
		2522	PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
		2523	chunk_name));
		2524	#endif
		2525
		2526	/* Png_free_data() will turn off the "valid" flag for anything it frees.
		2527	If you need to turn it off for a chunk that your application has freed,
		2528	you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
		2529	extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
		2530	png_infop info_ptr, int mask));
		2531
		2532	#if defined(PNG_INFO_IMAGE_SUPPORTED)
		2533	/* The "params" pointer is currently not used and is for future expansion. */
		2534	extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
		2535	png_infop info_ptr,
		2536	int transforms,
		2537	png_voidp params));
		2538	extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
		2539	png_infop info_ptr,
		2540	int transforms,
		2541	png_voidp params));
		2542	#endif
		2543
		2544	/* Define PNG_DEBUG at compile time for debugging information. Higher
		2545	* numbers for PNG_DEBUG mean more debugging information. This has
		2546	* only been added since version 0.95 so it is not implemented throughout
		2547	* libpng yet, but more support will be added as needed.
		2548	*/
		2549	#ifdef PNG_DEBUG
		2550	#if (PNG_DEBUG > 0)
		2551	#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
		2552	#include <crtdbg.h>
		2553	#if (PNG_DEBUG > 1)
		2554	#ifndef _DEBUG
		2555	# define _DEBUG
		2556	#endif
		2557	#ifndef png_debug
		2558	#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
		2559	#endif
		2560	#ifndef png_debug1
		2561	#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
		2562	#endif
		2563	#ifndef png_debug2
		2564	#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
		2565	#endif
		2566	#endif
		2567	#else /* PNG_DEBUG_FILE \|\| !_MSC_VER */
		2568	#ifndef PNG_DEBUG_FILE
		2569	#define PNG_DEBUG_FILE stderr
		2570	#endif /* PNG_DEBUG_FILE */
		2571
		2572	#if (PNG_DEBUG > 1)
		2573	/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
		2574	* non-ISO compilers */
		2575	# ifdef __STDC__
		2576	# ifndef png_debug
		2577	# define png_debug(l,m) \
		2578	{ \
		2579	int num_tabs=l; \
		2580	fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
		2581	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
		2582	}
		2583	# endif
		2584	# ifndef png_debug1
		2585	# define png_debug1(l,m,p1) \
		2586	{ \
		2587	int num_tabs=l; \
		2588	fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
		2589	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
		2590	}
		2591	# endif
		2592	# ifndef png_debug2
		2593	# define png_debug2(l,m,p1,p2) \
		2594	{ \
		2595	int num_tabs=l; \
		2596	fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
		2597	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
		2598	}
		2599	# endif
		2600	# else /* __STDC __ */
		2601	# ifndef png_debug
		2602	# define png_debug(l,m) \
		2603	{ \
		2604	int num_tabs=l; \
		2605	char format[256]; \
		2606	snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
		2607	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
		2608	m,PNG_STRING_NEWLINE); \
		2609	fprintf(PNG_DEBUG_FILE,format); \
		2610	}
		2611	# endif
		2612	# ifndef png_debug1
		2613	# define png_debug1(l,m,p1) \
		2614	{ \
		2615	int num_tabs=l; \
		2616	char format[256]; \
		2617	snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
		2618	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
		2619	m,PNG_STRING_NEWLINE); \
		2620	fprintf(PNG_DEBUG_FILE,format,p1); \
		2621	}
		2622	# endif
		2623	# ifndef png_debug2
		2624	# define png_debug2(l,m,p1,p2) \
		2625	{ \
		2626	int num_tabs=l; \
		2627	char format[256]; \
		2628	snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
		2629	(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
		2630	m,PNG_STRING_NEWLINE); \
		2631	fprintf(PNG_DEBUG_FILE,format,p1,p2); \
		2632	}
		2633	# endif
		2634	# endif /* __STDC __ */
		2635	#endif /* (PNG_DEBUG > 1) */
		2636
		2637	#endif /* _MSC_VER */
		2638	#endif /* (PNG_DEBUG > 0) */
		2639	#endif /* PNG_DEBUG */
		2640	#ifndef png_debug
		2641	#define png_debug(l, m)
		2642	#endif
		2643	#ifndef png_debug1
		2644	#define png_debug1(l, m, p1)
		2645	#endif
		2646	#ifndef png_debug2
		2647	#define png_debug2(l, m, p1, p2)
		2648	#endif
		2649
		2650	extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
		2651	extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
		2652	extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
		2653	extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
		2654
		2655	#ifdef PNG_MNG_FEATURES_SUPPORTED
		2656	extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
		2657	png_ptr, png_uint_32 mng_features_permitted));
		2658	#endif
		2659
		2660	/* For use in png_set_keep_unknown, added to version 1.2.6 */
		2661	#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
		2662	#define PNG_HANDLE_CHUNK_NEVER 1
		2663	#define PNG_HANDLE_CHUNK_IF_SAFE 2
		2664	#define PNG_HANDLE_CHUNK_ALWAYS 3
		2665
		2666	/* Added to version 1.2.0 */
		2667	#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
		2668	#if defined(PNG_MMX_CODE_SUPPORTED)
		2669	#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
		2670	#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
		2671	#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
		2672	#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
		2673	#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
		2674	#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
		2675	#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
		2676	#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
		2677	#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
		2678
		2679	#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
		2680	\| PNG_ASM_FLAG_MMX_READ_INTERLACE \
		2681	\| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
		2682	\| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
		2683	\| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
		2684	\| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
		2685	#define PNG_MMX_WRITE_FLAGS ( 0 )
		2686
		2687	#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
		2688	\| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
		2689	\| PNG_MMX_READ_FLAGS \
		2690	\| PNG_MMX_WRITE_FLAGS )
		2691
		2692	#define PNG_SELECT_READ 1
		2693	#define PNG_SELECT_WRITE 2
		2694	#endif /* PNG_MMX_CODE_SUPPORTED */
		2695
		2696	#if !defined(PNG_1_0_X)
		2697	/* pngget.c */
		2698	extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
		2699	PNGARG((int flag_select, int *compilerID));
		2700
		2701	/* pngget.c */
		2702	extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
		2703	PNGARG((int flag_select));
		2704
		2705	/* pngget.c */
		2706	extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
		2707	PNGARG((png_structp png_ptr));
		2708
		2709	/* pngget.c */
		2710	extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
		2711	PNGARG((png_structp png_ptr));
		2712
		2713	/* pngget.c */
		2714	extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
		2715	PNGARG((png_structp png_ptr));
		2716
		2717	/* pngset.c */
		2718	extern PNG_EXPORT(void,png_set_asm_flags)
		2719	PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
		2720
		2721	/* pngset.c */
		2722	extern PNG_EXPORT(void,png_set_mmx_thresholds)
		2723	PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
		2724	png_uint_32 mmx_rowbytes_threshold));
		2725
		2726	#endif /* PNG_1_0_X */
		2727
		2728	#if !defined(PNG_1_0_X)
		2729	/* png.c, pnggccrd.c, or pngvcrd.c */
		2730	extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
		2731	#endif /* PNG_1_0_X */
		2732	#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
		2733
		2734	/* Strip the prepended error numbers ("#nnn ") from error and warning
		2735	* messages before passing them to the error or warning handler. */
		2736	#ifdef PNG_ERROR_NUMBERS_SUPPORTED
		2737	extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
		2738	png_ptr, png_uint_32 strip_mode));
		2739	#endif
		2740
		2741	/* Added at libpng-1.2.6 */
		2742	#ifdef PNG_SET_USER_LIMITS_SUPPORTED
		2743	extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
		2744	png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
		2745	extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
		2746	png_ptr));
		2747	extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
		2748	png_ptr));
		2749	#endif
		2750
		2751
		2752	/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
		2753
		2754	#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
		2755	/* With these routines we avoid an integer divide, which will be slower on
		2756	* most machines. However, it does take more operations than the corresponding
		2757	* divide method, so it may be slower on a few RISC systems. There are two
		2758	* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
		2759	*
		2760	* Note that the rounding factors are NOT supposed to be the same! 128 and
		2761	* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
		2762	* standard method.
		2763	*
		2764	* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
		2765	*/
		2766
		2767	/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
		2768
		2769	# define png_composite(composite, fg, alpha, bg) \
		2770	{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
		2771	+ (png_uint_16)(bg)*(png_uint_16)(255 - \
		2772	(png_uint_16)(alpha)) + (png_uint_16)128); \
		2773	(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
		2774
		2775	# define png_composite_16(composite, fg, alpha, bg) \
		2776	{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
		2777	+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
		2778	(png_uint_32)(alpha)) + (png_uint_32)32768L); \
		2779	(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
		2780
		2781	#else /* standard method using integer division */
		2782
		2783	# define png_composite(composite, fg, alpha, bg) \
		2784	(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
		2785	(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
		2786	(png_uint_16)127) / 255)
		2787
		2788	# define png_composite_16(composite, fg, alpha, bg) \
		2789	(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
		2790	(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
		2791	(png_uint_32)32767) / (png_uint_32)65535L)
		2792
		2793	#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
		2794
		2795	/* Inline macros to do direct reads of bytes from the input buffer. These
		2796	* require that you are using an architecture that uses PNG byte ordering
		2797	* (MSB first) and supports unaligned data storage. I think that PowerPC
		2798	* in big-endian mode and 680x0 are the only ones that will support this.
		2799	* The x86 line of processors definitely do not. The png_get_int_32()
		2800	* routine also assumes we are using two's complement format for negative
		2801	* values, which is almost certainly true.
		2802	*/
		2803	#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
		2804	# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
		2805	# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
		2806	# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
		2807	#else
		2808	extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
		2809	extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
		2810	extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
		2811	#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
		2812	extern PNG_EXPORT(png_uint_32,png_get_uint_31)
		2813	PNGARG((png_structp png_ptr, png_bytep buf));
		2814	/* No png_get_int_16 -- may be added if there's a real need for it. */
		2815
		2816	/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
		2817	*/
		2818	extern PNG_EXPORT(void,png_save_uint_32)
		2819	PNGARG((png_bytep buf, png_uint_32 i));
		2820	extern PNG_EXPORT(void,png_save_int_32)
		2821	PNGARG((png_bytep buf, png_int_32 i));
		2822
		2823	/* Place a 16-bit number into a buffer in PNG byte order.
		2824	* The parameter is declared unsigned int, not png_uint_16,
		2825	* just to avoid potential problems on pre-ANSI C compilers.
		2826	*/
		2827	extern PNG_EXPORT(void,png_save_uint_16)
		2828	PNGARG((png_bytep buf, unsigned int i));
		2829	/* No png_save_int_16 -- may be added if there's a real need for it. */
		2830
		2831	/* ************************************************************************* */
		2832
		2833	/* These next functions are used internally in the code. They generally
		2834	* shouldn't be used unless you are writing code to add or replace some
		2835	* functionality in libpng. More information about most functions can
		2836	* be found in the files where the functions are located.
		2837	*/
		2838
		2839
		2840	/* Various modes of operation, that are visible to applications because
		2841	* they are used for unknown chunk location.
		2842	*/
		2843	#define PNG_HAVE_IHDR 0x01
		2844	#define PNG_HAVE_PLTE 0x02
		2845	#define PNG_HAVE_IDAT 0x04
		2846	#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
		2847	#define PNG_HAVE_IEND 0x10
		2848
		2849	#if defined(PNG_INTERNAL)
		2850
		2851	/* More modes of operation. Note that after an init, mode is set to
		2852	* zero automatically when the structure is created.
		2853	*/
		2854	#define PNG_HAVE_gAMA 0x20
		2855	#define PNG_HAVE_cHRM 0x40
		2856	#define PNG_HAVE_sRGB 0x80
		2857	#define PNG_HAVE_CHUNK_HEADER 0x100
		2858	#define PNG_WROTE_tIME 0x200
		2859	#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
		2860	#define PNG_BACKGROUND_IS_GRAY 0x800
		2861	#define PNG_HAVE_PNG_SIGNATURE 0x1000
		2862	#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
		2863
		2864	/* flags for the transformations the PNG library does on the image data */
		2865	#define PNG_BGR 0x0001
		2866	#define PNG_INTERLACE 0x0002
		2867	#define PNG_PACK 0x0004
		2868	#define PNG_SHIFT 0x0008
		2869	#define PNG_SWAP_BYTES 0x0010
		2870	#define PNG_INVERT_MONO 0x0020
		2871	#define PNG_DITHER 0x0040
		2872	#define PNG_BACKGROUND 0x0080
		2873	#define PNG_BACKGROUND_EXPAND 0x0100
		2874	/* 0x0200 unused */
		2875	#define PNG_16_TO_8 0x0400
		2876	#define PNG_RGBA 0x0800
		2877	#define PNG_EXPAND 0x1000
		2878	#define PNG_GAMMA 0x2000
		2879	#define PNG_GRAY_TO_RGB 0x4000
		2880	#define PNG_FILLER 0x8000L
		2881	#define PNG_PACKSWAP 0x10000L
		2882	#define PNG_SWAP_ALPHA 0x20000L
		2883	#define PNG_STRIP_ALPHA 0x40000L
		2884	#define PNG_INVERT_ALPHA 0x80000L
		2885	#define PNG_USER_TRANSFORM 0x100000L
		2886	#define PNG_RGB_TO_GRAY_ERR 0x200000L
		2887	#define PNG_RGB_TO_GRAY_WARN 0x400000L
		2888	#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR\|WARN */
		2889	/* 0x800000L Unused */
		2890	#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
		2891	#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
		2892	/* 0x4000000L unused */
		2893	/* 0x8000000L unused */
		2894	/* 0x10000000L unused */
		2895	/* 0x20000000L unused */
		2896	/* 0x40000000L unused */
		2897
		2898	/* flags for png_create_struct */
		2899	#define PNG_STRUCT_PNG 0x0001
		2900	#define PNG_STRUCT_INFO 0x0002
		2901
		2902	/* Scaling factor for filter heuristic weighting calculations */
		2903	#define PNG_WEIGHT_SHIFT 8
		2904	#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
		2905	#define PNG_COST_SHIFT 3
		2906	#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
		2907
		2908	/* flags for the png_ptr->flags rather than declaring a byte for each one */
		2909	#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
		2910	#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
		2911	#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
		2912	#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
		2913	#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
		2914	#define PNG_FLAG_ZLIB_FINISHED 0x0020
		2915	#define PNG_FLAG_ROW_INIT 0x0040
		2916	#define PNG_FLAG_FILLER_AFTER 0x0080
		2917	#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
		2918	#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
		2919	#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
		2920	#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
		2921	#define PNG_FLAG_FREE_PLTE 0x1000
		2922	#define PNG_FLAG_FREE_TRNS 0x2000
		2923	#define PNG_FLAG_FREE_HIST 0x4000
		2924	#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
		2925	#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
		2926	#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
		2927	#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
		2928	#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
		2929	#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
		2930	#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
		2931	#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
		2932	/* 0x800000L unused */
		2933	/* 0x1000000L unused */
		2934	/* 0x2000000L unused */
		2935	/* 0x4000000L unused */
		2936	/* 0x8000000L unused */
		2937	/* 0x10000000L unused */
		2938	/* 0x20000000L unused */
		2939	/* 0x40000000L unused */
		2940
		2941	#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE \| \
		2942	PNG_FLAG_CRC_ANCILLARY_NOWARN)
		2943
		2944	#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE \| \
		2945	PNG_FLAG_CRC_CRITICAL_IGNORE)
		2946
		2947	#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK \| \
		2948	PNG_FLAG_CRC_CRITICAL_MASK)
		2949
		2950	/* save typing and make code easier to understand */
		2951
		2952	#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
		2953	abs((int)((c1).green) - (int)((c2).green)) + \
		2954	abs((int)((c1).blue) - (int)((c2).blue)))
		2955
		2956	/* Added to libpng-1.2.6 JB */
		2957	#define PNG_ROWBYTES(pixel_bits, width) \
		2958	((pixel_bits) >= 8 ? \
		2959	((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
		2960	(( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
		2961
		2962	/* PNG_OUT_OF_RANGE returns true if value is outside the range
		2963	ideal-delta..ideal+delta. Each argument is evaluated twice.
		2964	"ideal" and "delta" should be constants, normally simple
		2965	integers, "value" a variable. Added to libpng-1.2.6 JB */
		2966	#define PNG_OUT_OF_RANGE(value, ideal, delta) \
		2967	( (value) < (ideal)-(delta) \|\| (value) > (ideal)+(delta) )
		2968
		2969	/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
		2970	#if !defined(PNG_NO_EXTERN) \|\| defined(PNG_ALWAYS_EXTERN)
		2971	/* place to hold the signature string for a PNG file. */
		2972	#ifdef PNG_USE_GLOBAL_ARRAYS
		2973	PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
		2974	#else
		2975	#endif
		2976	#endif /* PNG_NO_EXTERN */
		2977
		2978	/* Constant strings for known chunk types. If you need to add a chunk,
		2979	* define the name here, and add an invocation of the macro in png.c and
		2980	* wherever it's needed.
		2981	*/
		2982	#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
		2983	#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
		2984	#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
		2985	#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
		2986	#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
		2987	#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
		2988	#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
		2989	#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
		2990	#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
		2991	#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
		2992	#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
		2993	#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
		2994	#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
		2995	#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
		2996	#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
		2997	#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
		2998	#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
		2999	#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
		3000	#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
		3001	#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
		3002	#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
		3003
		3004	#ifdef PNG_USE_GLOBAL_ARRAYS
		3005	PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
		3006	PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
		3007	PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
		3008	PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
		3009	PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
		3010	PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
		3011	PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
		3012	PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
		3013	PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
		3014	PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
		3015	PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
		3016	PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
		3017	PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
		3018	PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
		3019	PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
		3020	PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
		3021	PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
		3022	PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
		3023	PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
		3024	PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
		3025	PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
		3026	#endif /* PNG_USE_GLOBAL_ARRAYS */
		3027
		3028	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		3029	/* Initialize png_ptr struct for reading, and allocate any other memory.
		3030	* (old interface - DEPRECATED - use png_create_read_struct instead).
		3031	*/
		3032	extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
		3033	#undef png_read_init
		3034	#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
		3035	PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
		3036	#endif
		3037
		3038	extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
		3039	png_const_charp user_png_ver, png_size_t png_struct_size));
		3040	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		3041	extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
		3042	png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
		3043	png_info_size));
		3044	#endif
		3045
		3046	#if defined(PNG_1_0_X) \|\| defined (PNG_1_2_X)
		3047	/* Initialize png_ptr struct for writing, and allocate any other memory.
		3048	* (old interface - DEPRECATED - use png_create_write_struct instead).
		3049	*/
		3050	extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
		3051	#undef png_write_init
		3052	#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
		3053	PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
		3054	#endif
		3055
		3056	extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
		3057	png_const_charp user_png_ver, png_size_t png_struct_size));
		3058	extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
		3059	png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
		3060	png_info_size));
		3061
		3062	/* Allocate memory for an internal libpng struct */
		3063	PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
		3064
		3065	/* Free memory from internal libpng struct */
		3066	PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
		3067
		3068	PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
		3069	malloc_fn, png_voidp mem_ptr));
		3070	PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
		3071	png_free_ptr free_fn, png_voidp mem_ptr));
		3072
		3073	/* Free any memory that info_ptr points to and reset struct. */
		3074	PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
		3075	png_infop info_ptr));
		3076
		3077	#ifndef PNG_1_0_X
		3078	/* Function to allocate memory for zlib. */
		3079	PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
		3080
		3081	/* Function to free memory for zlib */
		3082	PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
		3083
		3084	#ifdef PNG_SIZE_T
		3085	/* Function to convert a sizeof an item to png_sizeof item */
		3086	PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
		3087	#endif
		3088
		3089	/* Next four functions are used internally as callbacks. PNGAPI is required
		3090	* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
		3091
		3092	PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
		3093	png_bytep data, png_size_t length));
		3094
		3095	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		3096	PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
		3097	png_bytep buffer, png_size_t length));
		3098	#endif
		3099
		3100	PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
		3101	png_bytep data, png_size_t length));
		3102
		3103	#if defined(PNG_WRITE_FLUSH_SUPPORTED)
		3104	#if !defined(PNG_NO_STDIO)
		3105	PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
		3106	#endif
		3107	#endif
		3108	#else /* PNG_1_0_X */
		3109	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		3110	PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
		3111	png_bytep buffer, png_size_t length));
		3112	#endif
		3113	#endif /* PNG_1_0_X */
		3114
		3115	/* Reset the CRC variable */
		3116	PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
		3117
		3118	/* Write the "data" buffer to whatever output you are using. */
		3119	PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
		3120	png_size_t length));
		3121
		3122	/* Read data from whatever input you are using into the "data" buffer */
		3123	PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
		3124	png_size_t length));
		3125
		3126	/* Read bytes into buf, and update png_ptr->crc */
		3127	PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
		3128	png_size_t length));
		3129
		3130	/* Decompress data in a chunk that uses compression */
		3131	#if defined(PNG_zTXt_SUPPORTED) \|\| defined(PNG_iTXt_SUPPORTED) \|\| \
		3132	defined(PNG_iCCP_SUPPORTED) \|\| defined(PNG_sPLT_SUPPORTED)
		3133	PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
		3134	int comp_type, png_size_t chunklength,
		3135	png_size_t prefix_length, png_size_t *data_length));
		3136	#endif
		3137
		3138	/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
		3139	PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
		3140
		3141	/* Read the CRC from the file and compare it to the libpng calculated CRC */
		3142	PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
		3143
		3144	/* Calculate the CRC over a section of data. Note that we are only
		3145	* passing a maximum of 64K on systems that have this as a memory limit,
		3146	* since this is the maximum buffer size we can specify.
		3147	*/
		3148	PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
		3149	png_size_t length));
		3150
		3151	#if defined(PNG_WRITE_FLUSH_SUPPORTED)
		3152	PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
		3153	#endif
		3154
		3155	/* simple function to write the signature */
		3156	PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
		3157
		3158	/* write various chunks */
		3159
		3160	/* Write the IHDR chunk, and update the png_struct with the necessary
		3161	* information.
		3162	*/
		3163	PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
		3164	png_uint_32 height,
		3165	int bit_depth, int color_type, int compression_method, int filter_method,
		3166	int interlace_method));
		3167
		3168	PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
		3169	png_uint_32 num_pal));
		3170
		3171	PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
		3172	png_size_t length));
		3173
		3174	PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
		3175
		3176	#if defined(PNG_WRITE_gAMA_SUPPORTED)
		3177	#ifdef PNG_FLOATING_POINT_SUPPORTED
		3178	PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
		3179	#endif
		3180	#ifdef PNG_FIXED_POINT_SUPPORTED
		3181	PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
		3182	file_gamma));
		3183	#endif
		3184	#endif
		3185
		3186	#if defined(PNG_WRITE_sBIT_SUPPORTED)
		3187	PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
		3188	int color_type));
		3189	#endif
		3190
		3191	#if defined(PNG_WRITE_cHRM_SUPPORTED)
		3192	#ifdef PNG_FLOATING_POINT_SUPPORTED
		3193	PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
		3194	double white_x, double white_y,
		3195	double red_x, double red_y, double green_x, double green_y,
		3196	double blue_x, double blue_y));
		3197	#endif
		3198	#ifdef PNG_FIXED_POINT_SUPPORTED
		3199	PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
		3200	png_fixed_point int_white_x, png_fixed_point int_white_y,
		3201	png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
		3202	int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
		3203	png_fixed_point int_blue_y));
		3204	#endif
		3205	#endif
		3206
		3207	#if defined(PNG_WRITE_sRGB_SUPPORTED)
		3208	PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
		3209	int intent));
		3210	#endif
		3211
		3212	#if defined(PNG_WRITE_iCCP_SUPPORTED)
		3213	PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
		3214	png_charp name, int compression_type,
		3215	png_charp profile, int proflen));
		3216	/* Note to maintainer: profile should be png_bytep */
		3217	#endif
		3218
		3219	#if defined(PNG_WRITE_sPLT_SUPPORTED)
		3220	PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
		3221	png_sPLT_tp palette));
		3222	#endif
		3223
		3224	#if defined(PNG_WRITE_tRNS_SUPPORTED)
		3225	PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
		3226	png_color_16p values, int number, int color_type));
		3227	#endif
		3228
		3229	#if defined(PNG_WRITE_bKGD_SUPPORTED)
		3230	PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
		3231	png_color_16p values, int color_type));
		3232	#endif
		3233
		3234	#if defined(PNG_WRITE_hIST_SUPPORTED)
		3235	PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
		3236	int num_hist));
		3237	#endif
		3238
		3239	#if defined(PNG_WRITE_TEXT_SUPPORTED) \|\| defined(PNG_WRITE_pCAL_SUPPORTED) \|\| \
		3240	defined(PNG_WRITE_iCCP_SUPPORTED) \|\| defined(PNG_WRITE_sPLT_SUPPORTED)
		3241	PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
		3242	png_charp key, png_charpp new_key));
		3243	#endif
		3244
		3245	#if defined(PNG_WRITE_tEXt_SUPPORTED)
		3246	PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
		3247	png_charp text, png_size_t text_len));
		3248	#endif
		3249
		3250	#if defined(PNG_WRITE_zTXt_SUPPORTED)
		3251	PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
		3252	png_charp text, png_size_t text_len, int compression));
		3253	#endif
		3254
		3255	#if defined(PNG_WRITE_iTXt_SUPPORTED)
		3256	PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
		3257	int compression, png_charp key, png_charp lang, png_charp lang_key,
		3258	png_charp text));
		3259	#endif
		3260
		3261	#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
		3262	PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
		3263	png_infop info_ptr, png_textp text_ptr, int num_text));
		3264	#endif
		3265
		3266	#if defined(PNG_WRITE_oFFs_SUPPORTED)
		3267	PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
		3268	png_int_32 x_offset, png_int_32 y_offset, int unit_type));
		3269	#endif
		3270
		3271	#if defined(PNG_WRITE_pCAL_SUPPORTED)
		3272	PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
		3273	png_int_32 X0, png_int_32 X1, int type, int nparams,
		3274	png_charp units, png_charpp params));
		3275	#endif
		3276
		3277	#if defined(PNG_WRITE_pHYs_SUPPORTED)
		3278	PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
		3279	png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
		3280	int unit_type));
		3281	#endif
		3282
		3283	#if defined(PNG_WRITE_tIME_SUPPORTED)
		3284	PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
		3285	png_timep mod_time));
		3286	#endif
		3287
		3288	#if defined(PNG_WRITE_sCAL_SUPPORTED)
		3289	#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
		3290	PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
		3291	int unit, double width, double height));
		3292	#else
		3293	#ifdef PNG_FIXED_POINT_SUPPORTED
		3294	PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
		3295	int unit, png_charp width, png_charp height));
		3296	#endif
		3297	#endif
		3298	#endif
		3299
		3300	/* Called when finished processing a row of data */
		3301	PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
		3302
		3303	/* Internal use only. Called before first row of data */
		3304	PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
		3305
		3306	#if defined(PNG_READ_GAMMA_SUPPORTED)
		3307	PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
		3308	#endif
		3309
		3310	/* combine a row of data, dealing with alpha, etc. if requested */
		3311	PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
		3312	int mask));
		3313
		3314	#if defined(PNG_READ_INTERLACING_SUPPORTED)
		3315	/* expand an interlaced row */
		3316	/* OLD pre-1.0.9 interface:
		3317	PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
		3318	png_bytep row, int pass, png_uint_32 transformations));
		3319	*/
		3320	PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
		3321	#endif
		3322
		3323	/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
		3324
		3325	#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
		3326	/* grab pixels out of a row for an interlaced pass */
		3327	PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
		3328	png_bytep row, int pass));
		3329	#endif
		3330
		3331	/* unfilter a row */
		3332	PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
		3333	png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
		3334
		3335	/* Choose the best filter to use and filter the row data */
		3336	PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
		3337	png_row_infop row_info));
		3338
		3339	/* Write out the filtered row. */
		3340	PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
		3341	png_bytep filtered_row));
		3342	/* finish a row while reading, dealing with interlacing passes, etc. */
		3343	PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
		3344
		3345	/* initialize the row buffers, etc. */
		3346	PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
		3347	/* optional call to update the users info structure */
		3348	PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
		3349	png_infop info_ptr));
		3350
		3351	/* these are the functions that do the transformations */
		3352	#if defined(PNG_READ_FILLER_SUPPORTED)
		3353	PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
		3354	png_bytep row, png_uint_32 filler, png_uint_32 flags));
		3355	#endif
		3356
		3357	#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
		3358	PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
		3359	png_bytep row));
		3360	#endif
		3361
		3362	#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
		3363	PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
		3364	png_bytep row));
		3365	#endif
		3366
		3367	#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
		3368	PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
		3369	png_bytep row));
		3370	#endif
		3371
		3372	#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
		3373	PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
		3374	png_bytep row));
		3375	#endif
		3376
		3377	#if defined(PNG_WRITE_FILLER_SUPPORTED) \|\| \
		3378	defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
		3379	PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
		3380	png_bytep row, png_uint_32 flags));
		3381	#endif
		3382
		3383	#if defined(PNG_READ_SWAP_SUPPORTED) \|\| defined(PNG_WRITE_SWAP_SUPPORTED)
		3384	PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
		3385	#endif
		3386
		3387	#if defined(PNG_READ_PACKSWAP_SUPPORTED) \|\| defined(PNG_WRITE_PACKSWAP_SUPPORTED)
		3388	PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
		3389	#endif
		3390
		3391	#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
		3392	PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
		3393	row_info, png_bytep row));
		3394	#endif
		3395
		3396	#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
		3397	PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
		3398	png_bytep row));
		3399	#endif
		3400
		3401	#if defined(PNG_READ_PACK_SUPPORTED)
		3402	PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
		3403	#endif
		3404
		3405	#if defined(PNG_READ_SHIFT_SUPPORTED)
		3406	PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
		3407	png_color_8p sig_bits));
		3408	#endif
		3409
		3410	#if defined(PNG_READ_INVERT_SUPPORTED) \|\| defined(PNG_WRITE_INVERT_SUPPORTED)
		3411	PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
		3412	#endif
		3413
		3414	#if defined(PNG_READ_16_TO_8_SUPPORTED)
		3415	PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
		3416	#endif
		3417
		3418	#if defined(PNG_READ_DITHER_SUPPORTED)
		3419	PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
		3420	png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
		3421
		3422	# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
		3423	PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
		3424	png_colorp palette, int num_palette));
		3425	# endif
		3426	#endif
		3427
		3428	#if defined(PNG_READ_BGR_SUPPORTED) \|\| defined(PNG_WRITE_BGR_SUPPORTED)
		3429	PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
		3430	#endif
		3431
		3432	#if defined(PNG_WRITE_PACK_SUPPORTED)
		3433	PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
		3434	png_bytep row, png_uint_32 bit_depth));
		3435	#endif
		3436
		3437	#if defined(PNG_WRITE_SHIFT_SUPPORTED)
		3438	PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
		3439	png_color_8p bit_depth));
		3440	#endif
		3441
		3442	#if defined(PNG_READ_BACKGROUND_SUPPORTED)
		3443	#if defined(PNG_READ_GAMMA_SUPPORTED)
		3444	PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
		3445	png_color_16p trans_values, png_color_16p background,
		3446	png_color_16p background_1,
		3447	png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
		3448	png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
		3449	png_uint_16pp gamma_16_to_1, int gamma_shift));
		3450	#else
		3451	PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
		3452	png_color_16p trans_values, png_color_16p background));
		3453	#endif
		3454	#endif
		3455
		3456	#if defined(PNG_READ_GAMMA_SUPPORTED)
		3457	PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
		3458	png_bytep gamma_table, png_uint_16pp gamma_16_table,
		3459	int gamma_shift));
		3460	#endif
		3461
		3462	#if defined(PNG_READ_EXPAND_SUPPORTED)
		3463	PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
		3464	png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
		3465	PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
		3466	png_bytep row, png_color_16p trans_value));
		3467	#endif
		3468
		3469	/* The following decodes the appropriate chunks, and does error correction,
		3470	* then calls the appropriate callback for the chunk if it is valid.
		3471	*/
		3472
		3473	/* decode the IHDR chunk */
		3474	PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
		3475	png_uint_32 length));
		3476	PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
		3477	png_uint_32 length));
		3478	PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
		3479	png_uint_32 length));
		3480
		3481	#if defined(PNG_READ_bKGD_SUPPORTED)
		3482	PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
		3483	png_uint_32 length));
		3484	#endif
		3485
		3486	#if defined(PNG_READ_cHRM_SUPPORTED)
		3487	PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
		3488	png_uint_32 length));
		3489	#endif
		3490
		3491	#if defined(PNG_READ_gAMA_SUPPORTED)
		3492	PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
		3493	png_uint_32 length));
		3494	#endif
		3495
		3496	#if defined(PNG_READ_hIST_SUPPORTED)
		3497	PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
		3498	png_uint_32 length));
		3499	#endif
		3500
		3501	#if defined(PNG_READ_iCCP_SUPPORTED)
		3502	extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
		3503	png_uint_32 length));
		3504	#endif /* PNG_READ_iCCP_SUPPORTED */
		3505
		3506	#if defined(PNG_READ_iTXt_SUPPORTED)
		3507	PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
		3508	png_uint_32 length));
		3509	#endif
		3510
		3511	#if defined(PNG_READ_oFFs_SUPPORTED)
		3512	PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
		3513	png_uint_32 length));
		3514	#endif
		3515
		3516	#if defined(PNG_READ_pCAL_SUPPORTED)
		3517	PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
		3518	png_uint_32 length));
		3519	#endif
		3520
		3521	#if defined(PNG_READ_pHYs_SUPPORTED)
		3522	PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
		3523	png_uint_32 length));
		3524	#endif
		3525
		3526	#if defined(PNG_READ_sBIT_SUPPORTED)
		3527	PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
		3528	png_uint_32 length));
		3529	#endif
		3530
		3531	#if defined(PNG_READ_sCAL_SUPPORTED)
		3532	PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
		3533	png_uint_32 length));
		3534	#endif
		3535
		3536	#if defined(PNG_READ_sPLT_SUPPORTED)
		3537	extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
		3538	png_uint_32 length));
		3539	#endif /* PNG_READ_sPLT_SUPPORTED */
		3540
		3541	#if defined(PNG_READ_sRGB_SUPPORTED)
		3542	PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
		3543	png_uint_32 length));
		3544	#endif
		3545
		3546	#if defined(PNG_READ_tEXt_SUPPORTED)
		3547	PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
		3548	png_uint_32 length));
		3549	#endif
		3550
		3551	#if defined(PNG_READ_tIME_SUPPORTED)
		3552	PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
		3553	png_uint_32 length));
		3554	#endif
		3555
		3556	#if defined(PNG_READ_tRNS_SUPPORTED)
		3557	PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
		3558	png_uint_32 length));
		3559	#endif
		3560
		3561	#if defined(PNG_READ_zTXt_SUPPORTED)
		3562	PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
		3563	png_uint_32 length));
		3564	#endif
		3565
		3566	PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
		3567	png_infop info_ptr, png_uint_32 length));
		3568
		3569	PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
		3570	png_bytep chunk_name));
		3571
		3572	/* handle the transformations for reading and writing */
		3573	PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
		3574	PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
		3575
		3576	PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
		3577
		3578	#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
		3579	PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
		3580	png_infop info_ptr));
		3581	PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
		3582	png_infop info_ptr));
		3583	PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
		3584	PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
		3585	png_uint_32 length));
		3586	PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
		3587	PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
		3588	PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
		3589	png_bytep buffer, png_size_t buffer_length));
		3590	PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
		3591	PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
		3592	png_bytep buffer, png_size_t buffer_length));
		3593	PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
		3594	PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
		3595	png_infop info_ptr, png_uint_32 length));
		3596	PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
		3597	png_infop info_ptr));
		3598	PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
		3599	png_infop info_ptr));
		3600	PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
		3601	PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
		3602	png_infop info_ptr));
		3603	PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
		3604	png_infop info_ptr));
		3605	PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
		3606	#if defined(PNG_READ_tEXt_SUPPORTED)
		3607	PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
		3608	png_infop info_ptr, png_uint_32 length));
		3609	PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
		3610	png_infop info_ptr));
		3611	#endif
		3612	#if defined(PNG_READ_zTXt_SUPPORTED)
		3613	PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
		3614	png_infop info_ptr, png_uint_32 length));
		3615	PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
		3616	png_infop info_ptr));
		3617	#endif
		3618	#if defined(PNG_READ_iTXt_SUPPORTED)
		3619	PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
		3620	png_infop info_ptr, png_uint_32 length));
		3621	PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
		3622	png_infop info_ptr));
		3623	#endif
		3624
		3625	#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
		3626
		3627	#ifdef PNG_MNG_FEATURES_SUPPORTED
		3628	PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
		3629	png_bytep row));
		3630	PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
		3631	png_bytep row));
		3632	#endif
		3633
		3634	#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
		3635	#if defined(PNG_MMX_CODE_SUPPORTED)
		3636	/* png.c / / PRIVATE */
		3637	PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
		3638	#endif
		3639	#endif
		3640
		3641	#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
		3642	PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
		3643	png_infop info_ptr));
		3644
		3645	PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
		3646	png_infop info_ptr));
		3647
		3648	PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
		3649	png_infop info_ptr));
		3650
		3651	PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
		3652	png_infop info_ptr));
		3653
		3654	PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
		3655	png_infop info_ptr));
		3656
		3657	#if defined(PNG_pHYs_SUPPORTED)
		3658	PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
		3659	png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int *unit_type));
		3660	#endif /* PNG_pHYs_SUPPORTED */
		3661	#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
		3662
		3663	/* Read the chunk header (length + type name) */
		3664	PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
		3665
		3666	/* Added at libpng version 1.2.34 */
		3667	#if defined(PNG_cHRM_SUPPORTED)
		3668	PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
		3669	png_fixed_point int_white_x, png_fixed_point int_white_y,
		3670	png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
		3671	int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
		3672	png_fixed_point int_blue_y));
		3673	#endif
		3674
		3675	/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
		3676
		3677	#endif /* PNG_INTERNAL */
		3678
		3679	#ifdef __cplusplus
		3680	}
		3681	#endif
		3682
		3683	#endif /* PNG_VERSION_INFO_ONLY */
		3684	/* do not put anything past this line */
		3685	#endif /* PNG_H */

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