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/* png.h - header file for PNG reference library
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* libpng version 1.2.50 - July 10, 2012
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* Copyright (c) 1998-2012 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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* This code is released under the libpng license (See LICENSE, below)
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* Authors and maintainers:
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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* libpng versions 0.97, January 1998, through 1.2.50 - July 10, 2012: Glenn
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* See also "Contributing Authors", below.
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* Note about libpng version numbers:
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* Due to various miscommunications, unforeseen code incompatibilities
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* and occasional factors outside the authors' control, version numbering
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* on the library has not always been consistent and straightforward.
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* The following table summarizes matters since version 0.89c, which was
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* the first widely used release:
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* source png.h png.h shared-lib
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* version string int version
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* ------- ------ ----- ----------
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* 0.89c "1.0 beta 3" 0.89 89 1.0.89
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* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
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* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
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* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
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* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
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* 0.97c 0.97 97 2.0.97
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* 0.99a-m 0.99 99 2.0.99
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* 1.00 1.00 100 2.1.0 [100 should be 10000]
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* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
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* 1.0.1 png.h string is 10001 2.1.0
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* 1.0.1a-e identical to the 10002 from here on, the shared library
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* 1.0.2 source version) 10002 is 2.V where V is the source code
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* 1.0.2a-b 10003 version, except as noted.
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* 1.0.5 (+ 2 patches) 10005
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* 1.0.5e-r 10100 (not source compatible)
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* 1.0.5s-v 10006 (not binary compatible)
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* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
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* 1.0.6d-f 10007 (still binary incompatible)
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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
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* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
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* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
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* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
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* 1.0.7 1 10007 (still compatible)
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* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
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* 1.0.8rc1 1 10008 2.1.0.8rc1
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* 1.0.8 1 10008 2.1.0.8
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* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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* 1.0.9rc1 1 10009 2.1.0.9rc1
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* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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* 1.0.9rc2 1 10009 2.1.0.9rc2
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* 1.0.9 1 10009 2.1.0.9
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* 1.0.10beta1 1 10010 2.1.0.10beta1
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* 1.0.10rc1 1 10010 2.1.0.10rc1
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* 1.0.10 1 10010 2.1.0.10
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* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
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* 1.0.11rc1 1 10011 2.1.0.11rc1
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* 1.0.11 1 10011 2.1.0.11
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* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
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* 1.0.12rc1 2 10012 2.1.0.12rc1
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* 1.0.12 2 10012 2.1.0.12
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* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
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* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
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* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
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* 1.2.0rc1 3 10200 3.1.2.0rc1
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* 1.2.0 3 10200 3.1.2.0
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* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
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* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
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* 1.2.1 3 10201 3.1.2.1
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* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
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* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
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* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
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* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
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* 1.0.13 10 10013 10.so.0.1.0.13
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* 1.2.2 12 10202 12.so.0.1.2.2
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* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
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* 1.2.3 12 10203 12.so.0.1.2.3
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* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
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* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
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* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
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* 1.0.14 10 10014 10.so.0.1.0.14
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* 1.2.4 13 10204 12.so.0.1.2.4
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* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
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* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
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* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
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* 1.0.15 10 10015 10.so.0.1.0.15
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* 1.2.5 13 10205 12.so.0.1.2.5
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* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
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* 1.0.16 10 10016 10.so.0.1.0.16
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* 1.2.6 13 10206 12.so.0.1.2.6
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* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
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* 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
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* 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
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* 1.0.17 10 10017 10.so.0.1.0.17
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* 1.2.7 13 10207 12.so.0.1.2.7
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* 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
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* 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
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* 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
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* 1.0.18 10 10018 10.so.0.1.0.18
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* 1.2.8 13 10208 12.so.0.1.2.8
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* 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
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* 1.2.9beta4-11 13 10209 12.so.0.9[.0]
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* 1.2.9rc1 13 10209 12.so.0.9[.0]
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* 1.2.9 13 10209 12.so.0.9[.0]
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* 1.2.10beta1-8 13 10210 12.so.0.10[.0]
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* 1.2.10rc1-3 13 10210 12.so.0.10[.0]
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* 1.2.10 13 10210 12.so.0.10[.0]
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* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
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* 1.0.19rc1-5 10 10019 10.so.0.19[.0]
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* 1.2.11rc1-5 13 10211 12.so.0.11[.0]
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* 1.0.19 10 10019 10.so.0.19[.0]
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* 1.2.11 13 10211 12.so.0.11[.0]
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* 1.0.20 10 10020 10.so.0.20[.0]
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* 1.2.12 13 10212 12.so.0.12[.0]
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* 1.2.13beta1 13 10213 12.so.0.13[.0]
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* 1.0.21 10 10021 10.so.0.21[.0]
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* 1.2.13 13 10213 12.so.0.13[.0]
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* 1.2.14beta1-2 13 10214 12.so.0.14[.0]
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* 1.0.22rc1 10 10022 10.so.0.22[.0]
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* 1.2.14rc1 13 10214 12.so.0.14[.0]
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* 1.0.22 10 10022 10.so.0.22[.0]
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* 1.2.14 13 10214 12.so.0.14[.0]
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* 1.2.15beta1-6 13 10215 12.so.0.15[.0]
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* 1.0.23rc1-5 10 10023 10.so.0.23[.0]
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* 1.2.15rc1-5 13 10215 12.so.0.15[.0]
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* 1.0.23 10 10023 10.so.0.23[.0]
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* 1.2.15 13 10215 12.so.0.15[.0]
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* 1.2.16beta1-2 13 10216 12.so.0.16[.0]
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* 1.2.16rc1 13 10216 12.so.0.16[.0]
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* 1.0.24 10 10024 10.so.0.24[.0]
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* 1.2.16 13 10216 12.so.0.16[.0]
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* 1.2.17beta1-2 13 10217 12.so.0.17[.0]
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* 1.0.25rc1 10 10025 10.so.0.25[.0]
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* 1.2.17rc1-3 13 10217 12.so.0.17[.0]
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* 1.0.25 10 10025 10.so.0.25[.0]
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* 1.2.17 13 10217 12.so.0.17[.0]
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* 1.0.26 10 10026 10.so.0.26[.0]
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* 1.2.18 13 10218 12.so.0.18[.0]
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* 1.2.19beta1-31 13 10219 12.so.0.19[.0]
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* 1.0.27rc1-6 10 10027 10.so.0.27[.0]
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* 1.2.19rc1-6 13 10219 12.so.0.19[.0]
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* 1.0.27 10 10027 10.so.0.27[.0]
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* 1.2.19 13 10219 12.so.0.19[.0]
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* 1.2.20beta01-04 13 10220 12.so.0.20[.0]
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* 1.0.28rc1-6 10 10028 10.so.0.28[.0]
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* 1.2.20rc1-6 13 10220 12.so.0.20[.0]
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* 1.0.28 10 10028 10.so.0.28[.0]
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* 1.2.20 13 10220 12.so.0.20[.0]
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* 1.2.21beta1-2 13 10221 12.so.0.21[.0]
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* 1.2.21rc1-3 13 10221 12.so.0.21[.0]
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* 1.0.29 10 10029 10.so.0.29[.0]
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* 1.2.21 13 10221 12.so.0.21[.0]
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* 1.2.22beta1-4 13 10222 12.so.0.22[.0]
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* 1.0.30rc1 10 10030 10.so.0.30[.0]
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* 1.2.22rc1 13 10222 12.so.0.22[.0]
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* 1.0.30 10 10030 10.so.0.30[.0]
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* 1.2.22 13 10222 12.so.0.22[.0]
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* 1.2.23beta01-05 13 10223 12.so.0.23[.0]
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* 1.2.23rc01 13 10223 12.so.0.23[.0]
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* 1.2.23 13 10223 12.so.0.23[.0]
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* 1.2.24beta01-02 13 10224 12.so.0.24[.0]
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* 1.2.24rc01 13 10224 12.so.0.24[.0]
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* 1.2.24 13 10224 12.so.0.24[.0]
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* 1.2.25beta01-06 13 10225 12.so.0.25[.0]
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* 1.2.25rc01-02 13 10225 12.so.0.25[.0]
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* 1.0.31 10 10031 10.so.0.31[.0]
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* 1.2.25 13 10225 12.so.0.25[.0]
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* 1.2.26beta01-06 13 10226 12.so.0.26[.0]
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* 1.2.26rc01 13 10226 12.so.0.26[.0]
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* 1.2.26 13 10226 12.so.0.26[.0]
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* 1.0.32 10 10032 10.so.0.32[.0]
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* 1.2.27beta01-06 13 10227 12.so.0.27[.0]
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* 1.2.27rc01 13 10227 12.so.0.27[.0]
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* 1.0.33 10 10033 10.so.0.33[.0]
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* 1.2.27 13 10227 12.so.0.27[.0]
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* 1.0.34 10 10034 10.so.0.34[.0]
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* 1.2.28 13 10228 12.so.0.28[.0]
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* 1.2.29beta01-03 13 10229 12.so.0.29[.0]
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* 1.2.29rc01 13 10229 12.so.0.29[.0]
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* 1.0.35 10 10035 10.so.0.35[.0]
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* 1.2.29 13 10229 12.so.0.29[.0]
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* 1.0.37 10 10037 10.so.0.37[.0]
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* 1.2.30beta01-04 13 10230 12.so.0.30[.0]
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* 1.0.38rc01-08 10 10038 10.so.0.38[.0]
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* 1.2.30rc01-08 13 10230 12.so.0.30[.0]
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* 1.0.38 10 10038 10.so.0.38[.0]
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* 1.2.30 13 10230 12.so.0.30[.0]
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* 1.0.39rc01-03 10 10039 10.so.0.39[.0]
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* 1.2.31rc01-03 13 10231 12.so.0.31[.0]
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* 1.0.39 10 10039 10.so.0.39[.0]
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* 1.2.31 13 10231 12.so.0.31[.0]
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* 1.2.32beta01-02 13 10232 12.so.0.32[.0]
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* 1.0.40rc01 10 10040 10.so.0.40[.0]
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* 1.2.32rc01 13 10232 12.so.0.32[.0]
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* 1.0.40 10 10040 10.so.0.40[.0]
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* 1.2.32 13 10232 12.so.0.32[.0]
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* 1.2.33beta01-02 13 10233 12.so.0.33[.0]
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* 1.2.33rc01-02 13 10233 12.so.0.33[.0]
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* 1.0.41rc01 10 10041 10.so.0.41[.0]
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* 1.2.33 13 10233 12.so.0.33[.0]
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* 1.0.41 10 10041 10.so.0.41[.0]
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* 1.2.34beta01-07 13 10234 12.so.0.34[.0]
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* 1.0.42rc01 10 10042 10.so.0.42[.0]
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* 1.2.34rc01 13 10234 12.so.0.34[.0]
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* 1.0.42 10 10042 10.so.0.42[.0]
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* 1.2.34 13 10234 12.so.0.34[.0]
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* 1.2.35beta01-03 13 10235 12.so.0.35[.0]
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* 1.0.43rc01-02 10 10043 10.so.0.43[.0]
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* 1.2.35rc01-02 13 10235 12.so.0.35[.0]
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* 1.0.43 10 10043 10.so.0.43[.0]
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* 1.2.35 13 10235 12.so.0.35[.0]
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* 1.2.36beta01-05 13 10236 12.so.0.36[.0]
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* 1.2.36rc01 13 10236 12.so.0.36[.0]
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* 1.0.44 10 10044 10.so.0.44[.0]
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* 1.2.36 13 10236 12.so.0.36[.0]
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* 1.2.37beta01-03 13 10237 12.so.0.37[.0]
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* 1.2.37rc01 13 10237 12.so.0.37[.0]
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* 1.2.37 13 10237 12.so.0.37[.0]
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* 1.0.45 10 10045 12.so.0.45[.0]
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* 1.0.46 10 10046 10.so.0.46[.0]
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* 1.2.38beta01 13 10238 12.so.0.38[.0]
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* 1.2.38rc01-03 13 10238 12.so.0.38[.0]
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* 1.0.47 10 10047 10.so.0.47[.0]
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* 1.2.38 13 10238 12.so.0.38[.0]
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* 1.2.39beta01-05 13 10239 12.so.0.39[.0]
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* 1.2.39rc01 13 10239 12.so.0.39[.0]
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* 1.0.48 10 10048 10.so.0.48[.0]
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* 1.2.39 13 10239 12.so.0.39[.0]
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* 1.2.40beta01 13 10240 12.so.0.40[.0]
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* 1.2.40rc01 13 10240 12.so.0.40[.0]
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* 1.0.49 10 10049 10.so.0.49[.0]
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* 1.2.40 13 10240 12.so.0.40[.0]
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* 1.2.41beta01-18 13 10241 12.so.0.41[.0]
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* 1.0.51rc01 10 10051 10.so.0.51[.0]
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* 1.2.41rc01-03 13 10241 12.so.0.41[.0]
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* 1.0.51 10 10051 10.so.0.51[.0]
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* 1.2.41 13 10241 12.so.0.41[.0]
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* 1.2.42beta01-02 13 10242 12.so.0.42[.0]
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* 1.2.42rc01-05 13 10242 12.so.0.42[.0]
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* 1.0.52 10 10052 10.so.0.52[.0]
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* 1.2.42 13 10242 12.so.0.42[.0]
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* 1.2.43beta01-05 13 10243 12.so.0.43[.0]
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* 1.0.53rc01-02 10 10053 10.so.0.53[.0]
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* 1.2.43rc01-02 13 10243 12.so.0.43[.0]
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* 1.0.53 10 10053 10.so.0.53[.0]
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* 1.2.43 13 10243 12.so.0.43[.0]
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* 1.2.44beta01-03 13 10244 12.so.0.44[.0]
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* 1.2.44rc01-03 13 10244 12.so.0.44[.0]
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* 1.2.44 13 10244 12.so.0.44[.0]
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* 1.2.45beta01-03 13 10245 12.so.0.45[.0]
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* 1.0.55rc01 10 10055 10.so.0.55[.0]
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* 1.2.45rc01 13 10245 12.so.0.45[.0]
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* 1.0.55 10 10055 10.so.0.55[.0]
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* 1.2.45 13 10245 12.so.0.45[.0]
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* 1.2.46rc01-02 13 10246 12.so.0.46[.0]
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* 1.0.56 10 10056 10.so.0.56[.0]
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* 1.2.46 13 10246 12.so.0.46[.0]
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* 1.2.47beta01 13 10247 12.so.0.47[.0]
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* 1.2.47rc01 13 10247 12.so.0.47[.0]
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* 1.0.57rc01 10 10057 10.so.0.57[.0]
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* 1.2.47 13 10247 12.so.0.47[.0]
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* 1.0.57 10 10057 10.so.0.57[.0]
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* 1.2.48beta01 13 10248 12.so.0.48[.0]
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* 1.2.48rc01-02 13 10248 12.so.0.48[.0]
280
* 1.0.58 10 10058 10.so.0.58[.0]
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* 1.2.48 13 10248 12.so.0.48[.0]
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* 1.2.49rc01 13 10249 12.so.0.49[.0]
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* 1.0.59 10 10059 10.so.0.59[.0]
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* 1.2.49 13 10249 12.so.0.49[.0]
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* 1.0.60 10 10060 10.so.0.60[.0]
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* 1.2.50 13 10250 12.so.0.50[.0]
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* Henceforth the source version will match the shared-library major
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* and minor numbers; the shared-library major version number will be
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* used for changes in backward compatibility, as it is intended. The
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* PNG_LIBPNG_VER macro, which is not used within libpng but is available
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* for applications, is an unsigned integer of the form xyyzz corresponding
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* to the source version x.y.z (leading zeros in y and z). Beta versions
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* were given the previous public release number plus a letter, until
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* version 1.0.6j; from then on they were given the upcoming public
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* release number plus "betaNN" or "rcNN".
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* Binary incompatibility exists only when applications make direct access
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* to the info_ptr or png_ptr members through png.h, and the compiled
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* application is loaded with a different version of the library.
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* DLLNUM will change each time there are forward or backward changes
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* in binary compatibility (e.g., when a new feature is added).
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* See libpng.txt or libpng.3 for more information. The PNG specification
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* is available as a W3C Recommendation and as an ISO Specification,
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* <http://www.w3.org/TR/2003/REC-PNG-20031110/
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* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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* If you modify libpng you may insert additional notices immediately following
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* This code is released under the libpng license.
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* libpng versions 1.2.6, August 15, 2004, through 1.2.50, July 10, 2012, are
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* Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.2.5
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* with the following individual added to the list of Contributing Authors:
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* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
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* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.0.6
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* with the following individuals added to the list of Contributing Authors:
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* Simon-Pierre Cadieux
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* and with the following additions to the disclaimer:
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* There is no warranty against interference with your enjoyment of the
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* library or against infringement. There is no warranty that our
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* efforts or the library will fulfill any of your particular purposes
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* or needs. This library is provided with all faults, and the entire
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* risk of satisfactory quality, performance, accuracy, and effort is with
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* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
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* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-0.96,
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* with the following individuals added to the list of Contributing Authors:
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* Glenn Randers-Pehrson
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* libpng versions 0.89, June 1996, through 0.96, May 1997, are
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* Copyright (c) 1996, 1997 Andreas Dilger
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* Distributed according to the same disclaimer and license as libpng-0.88,
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* with the following individuals added to the list of Contributing Authors:
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* libpng versions 0.5, May 1995, through 0.88, January 1996, are
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* For the purposes of this copyright and license, "Contributing Authors"
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* is defined as the following set of individuals:
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* The PNG Reference Library is supplied "AS IS". The Contributing Authors
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* and Group 42, Inc. disclaim all warranties, expressed or implied,
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* including, without limitation, the warranties of merchantability and of
379
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
380
* assume no liability for direct, indirect, incidental, special, exemplary,
381
* or consequential damages, which may result from the use of the PNG
382
* Reference Library, even if advised of the possibility of such damage.
384
* Permission is hereby granted to use, copy, modify, and distribute this
385
* source code, or portions hereof, for any purpose, without fee, subject
386
* to the following restrictions:
388
* 1. The origin of this source code must not be misrepresented.
390
* 2. Altered versions must be plainly marked as such and
391
* must not be misrepresented as being the original source.
393
* 3. This Copyright notice may not be removed or altered from
394
* any source or altered source distribution.
396
* The Contributing Authors and Group 42, Inc. specifically permit, without
397
* fee, and encourage the use of this source code as a component to
398
* supporting the PNG file format in commercial products. If you use this
399
* source code in a product, acknowledgment is not required but would be
404
* A "png_get_copyright" function is available, for convenient use in "about"
405
* boxes and the like:
407
* printf("%s",png_get_copyright(NULL));
409
* Also, the PNG logo (in PNG format, of course) is supplied in the
410
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
414
* Libpng is OSI Certified Open Source Software. OSI Certified is a
415
* certification mark of the Open Source Initiative.
419
* The contributing authors would like to thank all those who helped
420
* with testing, bug fixes, and patience. This wouldn't have been
421
* possible without all of you.
423
* Thanks to Frank J. T. Wojcik for helping with the documentation.
427
* Y2K compliance in libpng:
428
* =========================
432
* Since the PNG Development group is an ad-hoc body, we can't make
433
* an official declaration.
435
* This is your unofficial assurance that libpng from version 0.71 and
436
* upward through 1.2.50 are Y2K compliant. It is my belief that earlier
437
* versions were also Y2K compliant.
439
* Libpng only has three year fields. One is a 2-byte unsigned integer
440
* that will hold years up to 65535. The other two hold the date in text
441
* format, and will hold years up to 9999.
444
* "png_uint_16 year" in png_time_struct.
447
* "png_charp time_buffer" in png_struct and
448
* "near_time_buffer", which is a local character string in png.c.
450
* There are seven time-related functions:
451
* png.c: png_convert_to_rfc_1123() in png.c
452
* (formerly png_convert_to_rfc_1152() in error)
453
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
454
* png_convert_from_time_t() in pngwrite.c
455
* png_get_tIME() in pngget.c
456
* png_handle_tIME() in pngrutil.c, called in pngread.c
457
* png_set_tIME() in pngset.c
458
* png_write_tIME() in pngwutil.c, called in pngwrite.c
460
* All handle dates properly in a Y2K environment. The
461
* png_convert_from_time_t() function calls gmtime() to convert from system
462
* clock time, which returns (year - 1900), which we properly convert to
463
* the full 4-digit year. There is a possibility that applications using
464
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
465
* function, or that they are incorrectly passing only a 2-digit year
466
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
467
* but this is not under our control. The libpng documentation has always
468
* stated that it works with 4-digit years, and the APIs have been
469
* documented as such.
471
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
472
* integer to hold the year, and can hold years as large as 65535.
474
* zlib, upon which libpng depends, is also Y2K compliant. It contains
475
* no date-related code.
477
* Glenn Randers-Pehrson
479
* PNG Development Group
485
/* This is not the place to learn how to use libpng. The file libpng.txt
486
* describes how to use libpng, and the file example.c summarizes it
487
* with some code on which to build. This file is useful for looking
488
* at the actual function definitions and structure components.
491
/* Version information for png.h - this should match the version in png.c */
492
#define PNG_LIBPNG_VER_STRING "1.2.50"
493
#define PNG_HEADER_VERSION_STRING \
494
" libpng version 1.2.50 - July 10, 2012\n"
496
#define PNG_LIBPNG_VER_SONUM 0
497
#define PNG_LIBPNG_VER_DLLNUM 13
499
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
500
#define PNG_LIBPNG_VER_MAJOR 1
501
#define PNG_LIBPNG_VER_MINOR 2
502
#define PNG_LIBPNG_VER_RELEASE 50
503
/* This should match the numeric part of the final component of
504
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
507
#define PNG_LIBPNG_VER_BUILD 0
510
#define PNG_LIBPNG_BUILD_ALPHA 1
511
#define PNG_LIBPNG_BUILD_BETA 2
512
#define PNG_LIBPNG_BUILD_RC 3
513
#define PNG_LIBPNG_BUILD_STABLE 4
514
#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
516
/* Release-Specific Flags */
517
#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
518
PNG_LIBPNG_BUILD_STABLE only */
519
#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
520
PNG_LIBPNG_BUILD_SPECIAL */
521
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
522
PNG_LIBPNG_BUILD_PRIVATE */
524
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
526
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
527
* We must not include leading zeros.
528
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
529
* version 1.0.0 was mis-numbered 100 instead of 10000). From
530
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
532
#define PNG_LIBPNG_VER 10250 /* 1.2.50 */
534
#ifndef PNG_VERSION_INFO_ONLY
535
/* Include the compression library's header */
539
/* Include all user configurable info, including optional assembler routines */
543
* Added at libpng-1.2.8 */
544
/* Ref MSDN: Private as priority over Special
545
* VS_FF_PRIVATEBUILD File *was not* built using standard release
546
* procedures. If this value is given, the StringFileInfo block must
547
* contain a PrivateBuild string.
549
* VS_FF_SPECIALBUILD File *was* built by the original company using
550
* standard release procedures but is a variation of the standard
551
* file of the same version number. If this value is given, the
552
* StringFileInfo block must contain a SpecialBuild string.
555
#ifdef PNG_USER_PRIVATEBUILD
556
# define PNG_LIBPNG_BUILD_TYPE \
557
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
559
# ifdef PNG_LIBPNG_SPECIALBUILD
560
# define PNG_LIBPNG_BUILD_TYPE \
561
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
563
# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
567
#ifndef PNG_VERSION_INFO_ONLY
569
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
572
#endif /* __cplusplus */
574
/* This file is arranged in several sections. The first section contains
575
* structure and type definitions. The second section contains the external
576
* library functions, while the third has the internal library functions,
577
* which applications aren't expected to use directly.
580
#ifndef PNG_NO_TYPECAST_NULL
581
#define int_p_NULL (int *)NULL
582
#define png_bytep_NULL (png_bytep)NULL
583
#define png_bytepp_NULL (png_bytepp)NULL
584
#define png_doublep_NULL (png_doublep)NULL
585
#define png_error_ptr_NULL (png_error_ptr)NULL
586
#define png_flush_ptr_NULL (png_flush_ptr)NULL
587
#define png_free_ptr_NULL (png_free_ptr)NULL
588
#define png_infopp_NULL (png_infopp)NULL
589
#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
590
#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
591
#define png_rw_ptr_NULL (png_rw_ptr)NULL
592
#define png_structp_NULL (png_structp)NULL
593
#define png_uint_16p_NULL (png_uint_16p)NULL
594
#define png_voidp_NULL (png_voidp)NULL
595
#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
597
#define int_p_NULL NULL
598
#define png_bytep_NULL NULL
599
#define png_bytepp_NULL NULL
600
#define png_doublep_NULL NULL
601
#define png_error_ptr_NULL NULL
602
#define png_flush_ptr_NULL NULL
603
#define png_free_ptr_NULL NULL
604
#define png_infopp_NULL NULL
605
#define png_malloc_ptr_NULL NULL
606
#define png_read_status_ptr_NULL NULL
607
#define png_rw_ptr_NULL NULL
608
#define png_structp_NULL NULL
609
#define png_uint_16p_NULL NULL
610
#define png_voidp_NULL NULL
611
#define png_write_status_ptr_NULL NULL
614
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
615
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
616
/* Version information for C files, stored in png.c. This had better match
619
#ifdef PNG_USE_GLOBAL_ARRAYS
620
PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
621
/* Need room for 99.99.99beta99z */
623
#define png_libpng_ver png_get_header_ver(NULL)
626
#ifdef PNG_USE_GLOBAL_ARRAYS
627
/* This was removed in version 1.0.5c */
628
/* Structures to facilitate easy interlacing. See png.c for more details */
629
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
630
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
631
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
632
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
633
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
634
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
635
/* This isn't currently used. If you need it, see png.c for more details.
636
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
640
#endif /* PNG_NO_EXTERN */
642
/* Three color definitions. The order of the red, green, and blue, (and the
643
* exact size) is not important, although the size of the fields need to
644
* be png_byte or png_uint_16 (as defined below).
646
typedef struct png_color_struct
652
typedef png_color FAR * png_colorp;
653
typedef png_color FAR * FAR * png_colorpp;
655
typedef struct png_color_16_struct
657
png_byte index; /* used for palette files */
658
png_uint_16 red; /* for use in red green blue files */
661
png_uint_16 gray; /* for use in grayscale files */
663
typedef png_color_16 FAR * png_color_16p;
664
typedef png_color_16 FAR * FAR * png_color_16pp;
666
typedef struct png_color_8_struct
668
png_byte red; /* for use in red green blue files */
671
png_byte gray; /* for use in grayscale files */
672
png_byte alpha; /* for alpha channel files */
674
typedef png_color_8 FAR * png_color_8p;
675
typedef png_color_8 FAR * FAR * png_color_8pp;
678
* The following two structures are used for the in-core representation
681
typedef struct png_sPLT_entry_struct
687
png_uint_16 frequency;
689
typedef png_sPLT_entry FAR * png_sPLT_entryp;
690
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
692
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
693
* occupy the LSB of their respective members, and the MSB of each member
694
* is zero-filled. The frequency member always occupies the full 16 bits.
697
typedef struct png_sPLT_struct
699
png_charp name; /* palette name */
700
png_byte depth; /* depth of palette samples */
701
png_sPLT_entryp entries; /* palette entries */
702
png_int_32 nentries; /* number of palette entries */
704
typedef png_sPLT_t FAR * png_sPLT_tp;
705
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
707
#ifdef PNG_TEXT_SUPPORTED
708
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
709
* and whether that contents is compressed or not. The "key" field
710
* points to a regular zero-terminated C string. The "text", "lang", and
711
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
712
* However, the * structure returned by png_get_text() will always contain
713
* regular zero-terminated C strings (possibly empty), never NULL pointers,
714
* so they can be safely used in printf() and other string-handling functions.
716
typedef struct png_text_struct
718
int compression; /* compression value:
723
png_charp key; /* keyword, 1-79 character description of "text" */
724
png_charp text; /* comment, may be an empty string (ie "")
726
png_size_t text_length; /* length of the text string */
727
#ifdef PNG_iTXt_SUPPORTED
728
png_size_t itxt_length; /* length of the itxt string */
729
png_charp lang; /* language code, 0-79 characters
731
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
732
chars or a NULL pointer */
735
typedef png_text FAR * png_textp;
736
typedef png_text FAR * FAR * png_textpp;
739
/* Supported compression types for text in PNG files (tEXt, and zTXt).
740
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
742
#define PNG_TEXT_COMPRESSION_NONE_WR -3
743
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
744
#define PNG_TEXT_COMPRESSION_NONE -1
745
#define PNG_TEXT_COMPRESSION_zTXt 0
746
#define PNG_ITXT_COMPRESSION_NONE 1
747
#define PNG_ITXT_COMPRESSION_zTXt 2
748
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
750
/* png_time is a way to hold the time in an machine independent way.
751
* Two conversions are provided, both from time_t and struct tm. There
752
* is no portable way to convert to either of these structures, as far
753
* as I know. If you know of a portable way, send it to me. As a side
754
* note - PNG has always been Year 2000 compliant!
756
typedef struct png_time_struct
758
png_uint_16 year; /* full year, as in, 1995 */
759
png_byte month; /* month of year, 1 - 12 */
760
png_byte day; /* day of month, 1 - 31 */
761
png_byte hour; /* hour of day, 0 - 23 */
762
png_byte minute; /* minute of hour, 0 - 59 */
763
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
765
typedef png_time FAR * png_timep;
766
typedef png_time FAR * FAR * png_timepp;
768
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
769
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
770
/* png_unknown_chunk is a structure to hold queued chunks for which there is
771
* no specific support. The idea is that we can use this to queue
772
* up private chunks for output even though the library doesn't actually
773
* know about their semantics.
775
#define PNG_CHUNK_NAME_LENGTH 5
776
typedef struct png_unknown_chunk_t
778
png_byte name[PNG_CHUNK_NAME_LENGTH];
782
/* libpng-using applications should NOT directly modify this byte. */
783
png_byte location; /* mode of operation at read time */
786
typedef png_unknown_chunk FAR * png_unknown_chunkp;
787
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
790
/* png_info is a structure that holds the information in a PNG file so
791
* that the application can find out the characteristics of the image.
792
* If you are reading the file, this structure will tell you what is
793
* in the PNG file. If you are writing the file, fill in the information
794
* you want to put into the PNG file, then call png_write_info().
795
* The names chosen should be very close to the PNG specification, so
796
* consult that document for information about the meaning of each field.
798
* With libpng < 0.95, it was only possible to directly set and read the
799
* the values in the png_info_struct, which meant that the contents and
800
* order of the values had to remain fixed. With libpng 0.95 and later,
801
* however, there are now functions that abstract the contents of
802
* png_info_struct from the application, so this makes it easier to use
803
* libpng with dynamic libraries, and even makes it possible to use
804
* libraries that don't have all of the libpng ancillary chunk-handing
807
* In any case, the order of the parameters in png_info_struct should NOT
808
* be changed for as long as possible to keep compatibility with applications
809
* that use the old direct-access method with png_info_struct.
811
* The following members may have allocated storage attached that should be
812
* cleaned up before the structure is discarded: palette, trans, text,
813
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
814
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
815
* are automatically freed when the info structure is deallocated, if they were
816
* allocated internally by libpng. This behavior can be changed by means
817
* of the png_data_freer() function.
819
* More allocation details: all the chunk-reading functions that
820
* change these members go through the corresponding png_set_*
821
* functions. A function to clear these members is available: see
822
* png_free_data(). The png_set_* functions do not depend on being
823
* able to point info structure members to any of the storage they are
824
* passed (they make their own copies), EXCEPT that the png_set_text
825
* functions use the same storage passed to them in the text_ptr or
826
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
827
* functions do not make their own copies.
829
typedef struct png_info_struct
831
/* The following are necessary for every PNG file */
832
png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */
833
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
834
png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */
835
png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */
836
png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */
837
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */
838
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */
839
png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
840
png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */
841
/* The following three should have been named *_method not *_type */
842
png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
843
png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
844
png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
846
/* The following is informational only on read, and not used on writes. */
847
png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */
848
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
849
png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */
850
png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */
852
/* The rest of the data is optional. If you are reading, check the
853
* valid field to see if the information in these are valid. If you
854
* are writing, set the valid field to those chunks you want written,
855
* and initialize the appropriate fields below.
858
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
859
/* The gAMA chunk describes the gamma characteristics of the system
860
* on which the image was created, normally in the range [1.0, 2.5].
861
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
863
float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
866
#ifdef PNG_sRGB_SUPPORTED
868
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
869
png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */
872
#ifdef PNG_TEXT_SUPPORTED
873
/* The tEXt, and zTXt chunks contain human-readable textual data in
874
* uncompressed, compressed, and optionally compressed forms, respectively.
875
* The data in "text" is an array of pointers to uncompressed,
876
* null-terminated C strings. Each chunk has a keyword that describes the
877
* textual data contained in that chunk. Keywords are not required to be
878
* unique, and the text string may be empty. Any number of text chunks may
881
int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
882
int max_text PNG_DEPSTRUCT; /* current size of text array */
883
png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
884
#endif /* PNG_TEXT_SUPPORTED */
886
#ifdef PNG_tIME_SUPPORTED
887
/* The tIME chunk holds the last time the displayed image data was
888
* modified. See the png_time struct for the contents of this struct.
890
png_time mod_time PNG_DEPSTRUCT;
893
#ifdef PNG_sBIT_SUPPORTED
894
/* The sBIT chunk specifies the number of significant high-order bits
895
* in the pixel data. Values are in the range [1, bit_depth], and are
896
* only specified for the channels in the pixel data. The contents of
897
* the low-order bits is not specified. Data is valid if
898
* (valid & PNG_INFO_sBIT) is non-zero.
900
png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
903
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
904
defined(PNG_READ_BACKGROUND_SUPPORTED)
905
/* The tRNS chunk supplies transparency data for paletted images and
906
* other image types that don't need a full alpha channel. There are
907
* "num_trans" transparency values for a paletted image, stored in the
908
* same order as the palette colors, starting from index 0. Values
909
* for the data are in the range [0, 255], ranging from fully transparent
910
* to fully opaque, respectively. For non-paletted images, there is a
911
* single color specified that should be treated as fully transparent.
912
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
914
png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */
915
png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */
918
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
919
/* The bKGD chunk gives the suggested image background color if the
920
* display program does not have its own background color and the image
921
* is needs to composited onto a background before display. The colors
922
* in "background" are normally in the same color space/depth as the
923
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
925
png_color_16 background PNG_DEPSTRUCT;
928
#ifdef PNG_oFFs_SUPPORTED
929
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
930
* and downwards from the top-left corner of the display, page, or other
931
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
932
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
934
png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
935
png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
936
png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
939
#ifdef PNG_pHYs_SUPPORTED
940
/* The pHYs chunk gives the physical pixel density of the image for
941
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
942
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
944
png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
945
png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
946
png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */
949
#ifdef PNG_hIST_SUPPORTED
950
/* The hIST chunk contains the relative frequency or importance of the
951
* various palette entries, so that a viewer can intelligently select a
952
* reduced-color palette, if required. Data is an array of "num_palette"
953
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
956
png_uint_16p hist PNG_DEPSTRUCT;
959
#ifdef PNG_cHRM_SUPPORTED
960
/* The cHRM chunk describes the CIE color characteristics of the monitor
961
* on which the PNG was created. This data allows the viewer to do gamut
962
* mapping of the input image to ensure that the viewer sees the same
963
* colors in the image as the creator. Values are in the range
964
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
966
#ifdef PNG_FLOATING_POINT_SUPPORTED
967
float x_white PNG_DEPSTRUCT;
968
float y_white PNG_DEPSTRUCT;
969
float x_red PNG_DEPSTRUCT;
970
float y_red PNG_DEPSTRUCT;
971
float x_green PNG_DEPSTRUCT;
972
float y_green PNG_DEPSTRUCT;
973
float x_blue PNG_DEPSTRUCT;
974
float y_blue PNG_DEPSTRUCT;
978
#ifdef PNG_pCAL_SUPPORTED
979
/* The pCAL chunk describes a transformation between the stored pixel
980
* values and original physical data values used to create the image.
981
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
982
* range given by [pcal_X0, pcal_X1], and are further transformed by a
983
* (possibly non-linear) transformation function given by "pcal_type"
984
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
985
* defines below, and the PNG-Group's PNG extensions document for a
986
* complete description of the transformations and how they should be
987
* implemented, and for a description of the ASCII parameter strings.
988
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
990
png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */
991
png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */
992
png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */
993
png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */
994
png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */
995
png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */
996
png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */
999
/* New members added in libpng-1.0.6 */
1000
#ifdef PNG_FREE_ME_SUPPORTED
1001
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
1004
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
1005
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
1006
/* Storage for unknown chunks that the library doesn't recognize. */
1007
png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
1008
png_size_t unknown_chunks_num PNG_DEPSTRUCT;
1011
#ifdef PNG_iCCP_SUPPORTED
1012
/* iCCP chunk data. */
1013
png_charp iccp_name PNG_DEPSTRUCT; /* profile name */
1014
png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */
1015
/* Note to maintainer: should be png_bytep */
1016
png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */
1017
png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
1020
#ifdef PNG_sPLT_SUPPORTED
1021
/* Data on sPLT chunks (there may be more than one). */
1022
png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
1023
png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
1026
#ifdef PNG_sCAL_SUPPORTED
1027
/* The sCAL chunk describes the actual physical dimensions of the
1028
* subject matter of the graphic. The chunk contains a unit specification
1029
* a byte value, and two ASCII strings representing floating-point
1030
* values. The values are width and height corresponsing to one pixel
1031
* in the image. This external representation is converted to double
1032
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
1034
png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */
1035
#ifdef PNG_FLOATING_POINT_SUPPORTED
1036
double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */
1037
double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */
1039
#ifdef PNG_FIXED_POINT_SUPPORTED
1040
png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */
1041
png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */
1045
#ifdef PNG_INFO_IMAGE_SUPPORTED
1046
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
1047
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
1048
png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */
1051
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
1052
png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */
1055
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
1056
png_fixed_point int_x_white PNG_DEPSTRUCT;
1057
png_fixed_point int_y_white PNG_DEPSTRUCT;
1058
png_fixed_point int_x_red PNG_DEPSTRUCT;
1059
png_fixed_point int_y_red PNG_DEPSTRUCT;
1060
png_fixed_point int_x_green PNG_DEPSTRUCT;
1061
png_fixed_point int_y_green PNG_DEPSTRUCT;
1062
png_fixed_point int_x_blue PNG_DEPSTRUCT;
1063
png_fixed_point int_y_blue PNG_DEPSTRUCT;
1068
typedef png_info FAR * png_infop;
1069
typedef png_info FAR * FAR * png_infopp;
1071
/* Maximum positive integer used in PNG is (2^31)-1 */
1072
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
1073
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
1074
#define PNG_SIZE_MAX ((png_size_t)(-1))
1075
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1076
/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
1077
#define PNG_MAX_UINT PNG_UINT_31_MAX
1080
/* These describe the color_type field in png_info. */
1081
/* color type masks */
1082
#define PNG_COLOR_MASK_PALETTE 1
1083
#define PNG_COLOR_MASK_COLOR 2
1084
#define PNG_COLOR_MASK_ALPHA 4
1086
/* color types. Note that not all combinations are legal */
1087
#define PNG_COLOR_TYPE_GRAY 0
1088
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
1089
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
1090
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
1091
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
1093
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
1094
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
1096
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
1097
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
1098
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
1100
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
1101
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
1102
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
1103
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
1105
/* These are for the interlacing type. These values should NOT be changed. */
1106
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
1107
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
1108
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
1110
/* These are for the oFFs chunk. These values should NOT be changed. */
1111
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
1112
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
1113
#define PNG_OFFSET_LAST 2 /* Not a valid value */
1115
/* These are for the pCAL chunk. These values should NOT be changed. */
1116
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
1117
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
1118
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
1119
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
1120
#define PNG_EQUATION_LAST 4 /* Not a valid value */
1122
/* These are for the sCAL chunk. These values should NOT be changed. */
1123
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
1124
#define PNG_SCALE_METER 1 /* meters per pixel */
1125
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
1126
#define PNG_SCALE_LAST 3 /* Not a valid value */
1128
/* These are for the pHYs chunk. These values should NOT be changed. */
1129
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
1130
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
1131
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
1133
/* These are for the sRGB chunk. These values should NOT be changed. */
1134
#define PNG_sRGB_INTENT_PERCEPTUAL 0
1135
#define PNG_sRGB_INTENT_RELATIVE 1
1136
#define PNG_sRGB_INTENT_SATURATION 2
1137
#define PNG_sRGB_INTENT_ABSOLUTE 3
1138
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
1140
/* This is for text chunks */
1141
#define PNG_KEYWORD_MAX_LENGTH 79
1143
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
1144
#define PNG_MAX_PALETTE_LENGTH 256
1146
/* These determine if an ancillary chunk's data has been successfully read
1147
* from the PNG header, or if the application has filled in the corresponding
1148
* data in the info_struct to be written into the output file. The values
1149
* of the PNG_INFO_<chunk> defines should NOT be changed.
1151
#define PNG_INFO_gAMA 0x0001
1152
#define PNG_INFO_sBIT 0x0002
1153
#define PNG_INFO_cHRM 0x0004
1154
#define PNG_INFO_PLTE 0x0008
1155
#define PNG_INFO_tRNS 0x0010
1156
#define PNG_INFO_bKGD 0x0020
1157
#define PNG_INFO_hIST 0x0040
1158
#define PNG_INFO_pHYs 0x0080
1159
#define PNG_INFO_oFFs 0x0100
1160
#define PNG_INFO_tIME 0x0200
1161
#define PNG_INFO_pCAL 0x0400
1162
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
1163
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
1164
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
1165
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
1166
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
1168
/* This is used for the transformation routines, as some of them
1169
* change these values for the row. It also should enable using
1170
* the routines for other purposes.
1172
typedef struct png_row_info_struct
1174
png_uint_32 width; /* width of row */
1175
png_uint_32 rowbytes; /* number of bytes in row */
1176
png_byte color_type; /* color type of row */
1177
png_byte bit_depth; /* bit depth of row */
1178
png_byte channels; /* number of channels (1, 2, 3, or 4) */
1179
png_byte pixel_depth; /* bits per pixel (depth * channels) */
1182
typedef png_row_info FAR * png_row_infop;
1183
typedef png_row_info FAR * FAR * png_row_infopp;
1185
/* These are the function types for the I/O functions and for the functions
1186
* that allow the user to override the default I/O functions with his or her
1187
* own. The png_error_ptr type should match that of user-supplied warning
1188
* and error functions, while the png_rw_ptr type should match that of the
1189
* user read/write data functions.
1191
typedef struct png_struct_def png_struct;
1192
typedef png_struct FAR * png_structp;
1194
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1195
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1196
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1197
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1199
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1202
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1203
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1204
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1205
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1209
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1210
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1211
defined(PNG_LEGACY_SUPPORTED)
1212
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1213
png_row_infop, png_bytep));
1216
#ifdef PNG_USER_CHUNKS_SUPPORTED
1217
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1219
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1220
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1223
/* Transform masks for the high-level interface */
1224
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1225
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1226
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1227
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1228
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1229
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1230
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1231
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1232
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1233
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1234
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1235
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1236
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */
1237
/* Added to libpng-1.2.34 */
1238
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */
1239
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
1240
/* Added to libpng-1.2.41 */
1241
#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
1243
/* Flags for MNG supported features */
1244
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1245
#define PNG_FLAG_MNG_FILTER_64 0x04
1246
#define PNG_ALL_MNG_FEATURES 0x05
1248
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1249
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1251
/* The structure that holds the information to read and write PNG files.
1252
* The only people who need to care about what is inside of this are the
1253
* people who will be modifying the library for their own special needs.
1254
* It should NOT be accessed directly by an application, except to store
1258
struct png_struct_def
1260
#ifdef PNG_SETJMP_SUPPORTED
1261
jmp_buf jmpbuf; /* used in png_error */
1263
png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */
1264
png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */
1265
png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */
1266
png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */
1267
png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */
1268
png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */
1270
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1271
png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */
1274
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1275
png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */
1278
/* These were added in libpng-1.0.2 */
1279
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
1280
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1281
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1282
png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */
1283
png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */
1284
png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */
1288
png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */
1289
png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */
1290
png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */
1292
z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */
1293
png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */
1294
png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */
1295
int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */
1296
int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */
1297
int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */
1298
int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */
1299
int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */
1301
png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */
1302
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */
1303
png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */
1304
png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */
1305
png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */
1306
#if 0 /* Replaced with the following in libpng-1.2.43 */
1307
png_size_t irowbytes PNG_DEPSTRUCT;
1309
/* Added in libpng-1.2.43 */
1310
#ifdef PNG_USER_LIMITS_SUPPORTED
1311
/* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
1312
* chunks that can be stored (0 means unlimited).
1314
png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
1316
png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */
1317
png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */
1318
png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */
1319
png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
1320
#ifndef PNG_NO_WRITE_FILTER
1321
png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */
1322
png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */
1323
png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */
1324
png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */
1326
png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */
1328
png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */
1329
png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */
1330
png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */
1331
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */
1332
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */
1333
png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */
1334
png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */
1335
png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */
1336
png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1337
png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */
1338
png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */
1339
png_byte color_type PNG_DEPSTRUCT; /* color type of file */
1340
png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */
1341
png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */
1342
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
1343
png_byte channels PNG_DEPSTRUCT; /* number of channels in file */
1344
png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */
1345
png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */
1347
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1348
#ifdef PNG_LEGACY_SUPPORTED
1349
png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */
1351
png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */
1355
#ifdef PNG_bKGD_SUPPORTED
1356
png_byte background_gamma_type PNG_DEPSTRUCT;
1357
# ifdef PNG_FLOATING_POINT_SUPPORTED
1358
float background_gamma PNG_DEPSTRUCT;
1360
png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */
1361
#ifdef PNG_READ_GAMMA_SUPPORTED
1362
png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */
1364
#endif /* PNG_bKGD_SUPPORTED */
1366
#ifdef PNG_WRITE_FLUSH_SUPPORTED
1367
png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */
1368
png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */
1369
png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */
1372
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1373
int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */
1374
#ifdef PNG_FLOATING_POINT_SUPPORTED
1375
float gamma PNG_DEPSTRUCT; /* file gamma value */
1376
float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */
1380
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1381
png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */
1382
png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
1383
png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1384
png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */
1385
png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
1386
png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1389
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1390
png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */
1393
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1394
png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */
1397
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1398
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1399
png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */
1400
png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */
1403
png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */
1404
png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */
1405
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1406
png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */
1407
png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */
1408
png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */
1409
png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */
1410
png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */
1411
png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */
1412
png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */
1413
png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */
1414
png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */
1415
png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */
1416
png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */
1417
png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */
1418
png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */
1419
int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */
1420
int cur_palette PNG_DEPSTRUCT; /* current push library palette index */
1422
# ifdef PNG_TEXT_SUPPORTED
1423
png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */
1424
png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */
1425
png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */
1426
png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */
1427
# endif /* PNG_TEXT_SUPPORTED */
1428
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1430
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1431
/* for the Borland special 64K segment handler */
1432
png_bytepp offset_table_ptr PNG_DEPSTRUCT;
1433
png_bytep offset_table PNG_DEPSTRUCT;
1434
png_uint_16 offset_table_number PNG_DEPSTRUCT;
1435
png_uint_16 offset_table_count PNG_DEPSTRUCT;
1436
png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
1439
#ifdef PNG_READ_DITHER_SUPPORTED
1440
png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */
1441
png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */
1444
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1445
png_uint_16p hist PNG_DEPSTRUCT; /* histogram */
1448
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1449
png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */
1450
png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */
1451
png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */
1452
png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */
1453
png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */
1454
png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */
1455
png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */
1458
#ifdef PNG_TIME_RFC1123_SUPPORTED
1459
png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
1462
/* New members added in libpng-1.0.6 */
1464
#ifdef PNG_FREE_ME_SUPPORTED
1465
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
1468
#ifdef PNG_USER_CHUNKS_SUPPORTED
1469
png_voidp user_chunk_ptr PNG_DEPSTRUCT;
1470
png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */
1473
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1474
int num_chunk_list PNG_DEPSTRUCT;
1475
png_bytep chunk_list PNG_DEPSTRUCT;
1478
/* New members added in libpng-1.0.3 */
1479
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1480
png_byte rgb_to_gray_status PNG_DEPSTRUCT;
1481
/* These were changed from png_byte in libpng-1.0.6 */
1482
png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
1483
png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
1484
png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
1487
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1488
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1489
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1490
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1491
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
1493
png_byte mng_features_permitted PNG_DEPSTRUCT;
1495
png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
1496
#endif /* PNG_1_0_X */
1499
/* New member added in libpng-1.0.7 */
1500
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1501
png_fixed_point int_gamma PNG_DEPSTRUCT;
1504
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1505
#ifdef PNG_MNG_FEATURES_SUPPORTED
1506
png_byte filter_type PNG_DEPSTRUCT;
1510
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1511
png_uint_32 row_buf_size PNG_DEPSTRUCT;
1514
/* New members added in libpng-1.2.0 */
1515
#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
1517
# ifdef PNG_MMX_CODE_SUPPORTED
1518
png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT;
1519
png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT;
1521
png_uint_32 asm_flags PNG_DEPSTRUCT;
1525
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1526
#ifdef PNG_USER_MEM_SUPPORTED
1527
png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */
1528
png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */
1529
png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */
1532
/* New member added in libpng-1.0.13 and 1.2.0 */
1533
png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
1535
#ifdef PNG_READ_DITHER_SUPPORTED
1536
/* The following three members were added at version 1.0.14 and 1.2.4 */
1537
png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */
1538
png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */
1539
/* in the palette */
1540
png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */
1544
/* New members added in libpng-1.0.16 and 1.2.6 */
1545
png_byte compression_type PNG_DEPSTRUCT;
1547
#ifdef PNG_USER_LIMITS_SUPPORTED
1548
png_uint_32 user_width_max PNG_DEPSTRUCT;
1549
png_uint_32 user_height_max PNG_DEPSTRUCT;
1552
/* New member added in libpng-1.0.25 and 1.2.17 */
1553
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1554
/* Storage for unknown chunk that the library doesn't recognize. */
1555
png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
1558
/* New members added in libpng-1.2.26 */
1559
png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
1560
png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
1562
/* New member added in libpng-1.2.30 */
1563
png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */
1569
/* This triggers a compiler error in png.c, if png.c and png.h
1570
* do not agree upon the version number.
1572
typedef png_structp version_1_2_50;
1574
typedef png_struct FAR * FAR * png_structpp;
1576
/* Here are the function definitions most commonly used. This is not
1577
* the place to find out how to use libpng. See libpng.txt for the
1578
* full explanation, see example.c for the summary. This just provides
1579
* a simple one line description of the use of each function.
1582
/* Returns the version number of the library */
1583
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1585
/* Tell lib we have already handled the first <num_bytes> magic bytes.
1586
* Handling more than 8 bytes from the beginning of the file is an error.
1588
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1591
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1592
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1593
* signature, and non-zero otherwise. Having num_to_check == 0 or
1594
* start > 7 will always fail (ie return non-zero).
1596
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1597
png_size_t num_to_check));
1599
/* Simple signature checking function. This is the same as calling
1600
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1602
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED;
1604
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1605
extern PNG_EXPORT(png_structp,png_create_read_struct)
1606
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1607
png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1609
/* Allocate and initialize png_ptr struct for writing, and any other memory */
1610
extern PNG_EXPORT(png_structp,png_create_write_struct)
1611
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1612
png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1614
#ifdef PNG_WRITE_SUPPORTED
1615
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1616
PNGARG((png_structp png_ptr));
1619
#ifdef PNG_WRITE_SUPPORTED
1620
extern PNG_EXPORT(void,png_set_compression_buffer_size)
1621
PNGARG((png_structp png_ptr, png_uint_32 size));
1624
/* Reset the compression stream */
1625
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1627
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1628
#ifdef PNG_USER_MEM_SUPPORTED
1629
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1630
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1631
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1632
png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1633
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1634
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1635
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1636
png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1639
/* Write a PNG chunk - size, type, (optional) data, CRC. */
1640
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1641
png_bytep chunk_name, png_bytep data, png_size_t length));
1643
/* Write the start of a PNG chunk - length and chunk name. */
1644
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1645
png_bytep chunk_name, png_uint_32 length));
1647
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1648
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1649
png_bytep data, png_size_t length));
1651
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1652
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1654
/* Allocate and initialize the info structure */
1655
extern PNG_EXPORT(png_infop,png_create_info_struct)
1656
PNGARG((png_structp png_ptr)) PNG_ALLOCATED;
1658
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1659
/* Initialize the info structure (old interface - DEPRECATED) */
1660
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr))
1662
#undef png_info_init
1663
#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1664
png_sizeof(png_info));
1667
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1668
png_size_t png_info_struct_size));
1670
/* Writes all the PNG information before the image. */
1671
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1672
png_infop info_ptr));
1673
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1674
png_infop info_ptr));
1676
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1677
/* Read the information before the actual image data. */
1678
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1679
png_infop info_ptr));
1682
#ifdef PNG_TIME_RFC1123_SUPPORTED
1683
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1684
PNGARG((png_structp png_ptr, png_timep ptime));
1687
#ifdef PNG_CONVERT_tIME_SUPPORTED
1688
/* Convert from a struct tm to png_time */
1689
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1690
struct tm FAR * ttime));
1692
/* Convert from time_t to png_time. Uses gmtime() */
1693
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1695
#endif /* PNG_CONVERT_tIME_SUPPORTED */
1697
#ifdef PNG_READ_EXPAND_SUPPORTED
1698
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1699
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1701
extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1704
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1705
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1706
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1708
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp
1709
png_ptr)) PNG_DEPRECATED;
1713
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1714
/* Use blue, green, red order for pixels. */
1715
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1718
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1719
/* Expand the grayscale to 24-bit RGB if necessary. */
1720
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1723
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1724
/* Reduce RGB to grayscale. */
1725
#ifdef PNG_FLOATING_POINT_SUPPORTED
1726
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1727
int error_action, double red, double green ));
1729
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1730
int error_action, png_fixed_point red, png_fixed_point green ));
1731
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1735
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1736
png_colorp palette));
1738
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
1739
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1742
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1743
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1744
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1747
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1748
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1749
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1752
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1753
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1754
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1755
png_uint_32 filler, int flags));
1756
/* The values of the PNG_FILLER_ defines should NOT be changed */
1757
#define PNG_FILLER_BEFORE 0
1758
#define PNG_FILLER_AFTER 1
1759
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1761
extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1762
png_uint_32 filler, int flags));
1764
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1766
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1767
/* Swap bytes in 16-bit depth files. */
1768
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1771
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1772
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1773
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1776
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1777
/* Swap packing order of pixels in bytes. */
1778
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1781
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1782
/* Converts files to legal bit depths. */
1783
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1784
png_color_8p true_bits));
1787
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1788
defined(PNG_WRITE_INTERLACING_SUPPORTED)
1789
/* Have the code handle the interlacing. Returns the number of passes. */
1790
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1793
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1794
/* Invert monochrome files */
1795
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1798
#ifdef PNG_READ_BACKGROUND_SUPPORTED
1799
/* Handle alpha and tRNS by replacing with a background color. */
1800
#ifdef PNG_FLOATING_POINT_SUPPORTED
1801
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1802
png_color_16p background_color, int background_gamma_code,
1803
int need_expand, double background_gamma));
1805
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1806
#define PNG_BACKGROUND_GAMMA_SCREEN 1
1807
#define PNG_BACKGROUND_GAMMA_FILE 2
1808
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1811
#ifdef PNG_READ_16_TO_8_SUPPORTED
1812
/* Strip the second byte of information from a 16-bit depth file. */
1813
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1816
#ifdef PNG_READ_DITHER_SUPPORTED
1817
/* Turn on dithering, and reduce the palette to the number of colors available. */
1818
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1819
png_colorp palette, int num_palette, int maximum_colors,
1820
png_uint_16p histogram, int full_dither));
1823
#ifdef PNG_READ_GAMMA_SUPPORTED
1824
/* Handle gamma correction. Screen_gamma=(display_exponent) */
1825
#ifdef PNG_FLOATING_POINT_SUPPORTED
1826
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1827
double screen_gamma, double default_file_gamma));
1831
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
1832
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1833
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1834
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1835
/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1836
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1837
int empty_plte_permitted)) PNG_DEPRECATED;
1841
#ifdef PNG_WRITE_FLUSH_SUPPORTED
1842
/* Set how many lines between output flushes - 0 for no flushing */
1843
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1844
/* Flush the current PNG output buffer */
1845
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1848
/* Optional update palette with requested transformations */
1849
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1851
/* Optional call to update the users info structure */
1852
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1853
png_infop info_ptr));
1855
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1856
/* Read one or more rows of image data. */
1857
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1858
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1861
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1862
/* Read a row of data. */
1863
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1865
png_bytep display_row));
1868
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1869
/* Read the whole image into memory at once. */
1870
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1874
/* Write a row of image data */
1875
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1878
/* Write a few rows of image data */
1879
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1880
png_bytepp row, png_uint_32 num_rows));
1882
/* Write the image data */
1883
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1886
/* Writes the end of the PNG file. */
1887
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1888
png_infop info_ptr));
1890
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1891
/* Read the end of the PNG file. */
1892
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1893
png_infop info_ptr));
1896
/* Free any memory associated with the png_info_struct */
1897
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1898
png_infopp info_ptr_ptr));
1900
/* Free any memory associated with the png_struct and the png_info_structs */
1901
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1902
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1904
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
1905
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1906
png_infop end_info_ptr)) PNG_DEPRECATED;
1908
/* Free any memory associated with the png_struct and the png_info_structs */
1909
extern PNG_EXPORT(void,png_destroy_write_struct)
1910
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1912
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1913
extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED;
1915
/* Set the libpng method of handling chunk CRC errors */
1916
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1917
int crit_action, int ancil_action));
1919
/* Values for png_set_crc_action() to say how to handle CRC errors in
1920
* ancillary and critical chunks, and whether to use the data contained
1921
* therein. Note that it is impossible to "discard" data in a critical
1922
* chunk. For versions prior to 0.90, the action was always error/quit,
1923
* whereas in version 0.90 and later, the action for CRC errors in ancillary
1924
* chunks is warn/discard. These values should NOT be changed.
1926
* value action:critical action:ancillary
1928
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1929
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1930
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1931
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1932
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1933
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1935
/* These functions give the user control over the scan-line filtering in
1936
* libpng and the compression methods used by zlib. These functions are
1937
* mainly useful for testing, as the defaults should work with most users.
1938
* Those users who are tight on memory or want faster performance at the
1939
* expense of compression can modify them. See the compression library
1940
* header file (zlib.h) for an explination of the compression functions.
1943
/* Set the filtering method(s) used by libpng. Currently, the only valid
1944
* value for "method" is 0.
1946
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1949
/* Flags for png_set_filter() to say which filters to use. The flags
1950
* are chosen so that they don't conflict with real filter types
1951
* below, in case they are supplied instead of the #defined constants.
1952
* These values should NOT be changed.
1954
#define PNG_NO_FILTERS 0x00
1955
#define PNG_FILTER_NONE 0x08
1956
#define PNG_FILTER_SUB 0x10
1957
#define PNG_FILTER_UP 0x20
1958
#define PNG_FILTER_AVG 0x40
1959
#define PNG_FILTER_PAETH 0x80
1960
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1961
PNG_FILTER_AVG | PNG_FILTER_PAETH)
1963
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1964
* These defines should NOT be changed.
1966
#define PNG_FILTER_VALUE_NONE 0
1967
#define PNG_FILTER_VALUE_SUB 1
1968
#define PNG_FILTER_VALUE_UP 2
1969
#define PNG_FILTER_VALUE_AVG 3
1970
#define PNG_FILTER_VALUE_PAETH 4
1971
#define PNG_FILTER_VALUE_LAST 5
1973
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1974
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1975
* defines, either the default (minimum-sum-of-absolute-differences), or
1976
* the experimental method (weighted-minimum-sum-of-absolute-differences).
1978
* Weights are factors >= 1.0, indicating how important it is to keep the
1979
* filter type consistent between rows. Larger numbers mean the current
1980
* filter is that many times as likely to be the same as the "num_weights"
1981
* previous filters. This is cumulative for each previous row with a weight.
1982
* There needs to be "num_weights" values in "filter_weights", or it can be
1983
* NULL if the weights aren't being specified. Weights have no influence on
1984
* the selection of the first row filter. Well chosen weights can (in theory)
1985
* improve the compression for a given image.
1987
* Costs are factors >= 1.0 indicating the relative decoding costs of a
1988
* filter type. Higher costs indicate more decoding expense, and are
1989
* therefore less likely to be selected over a filter with lower computational
1990
* costs. There needs to be a value in "filter_costs" for each valid filter
1991
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1992
* setting the costs. Costs try to improve the speed of decompression without
1993
* unduly increasing the compressed image size.
1995
* A negative weight or cost indicates the default value is to be used, and
1996
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1997
* The default values for both weights and costs are currently 1.0, but may
1998
* change if good general weighting/cost heuristics can be found. If both
1999
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
2000
* to the UNWEIGHTED method, but with added encoding time/computation.
2002
#ifdef PNG_FLOATING_POINT_SUPPORTED
2003
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
2004
int heuristic_method, int num_weights, png_doublep filter_weights,
2005
png_doublep filter_costs));
2007
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
2009
/* Heuristic used for row filter selection. These defines should NOT be
2012
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
2013
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
2014
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
2015
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
2017
/* Set the library compression level. Currently, valid values range from
2018
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
2019
* (0 - no compression, 9 - "maximal" compression). Note that tests have
2020
* shown that zlib compression levels 3-6 usually perform as well as level 9
2021
* for PNG images, and do considerably fewer caclulations. In the future,
2022
* these values may not correspond directly to the zlib compression levels.
2024
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
2027
extern PNG_EXPORT(void,png_set_compression_mem_level)
2028
PNGARG((png_structp png_ptr, int mem_level));
2030
extern PNG_EXPORT(void,png_set_compression_strategy)
2031
PNGARG((png_structp png_ptr, int strategy));
2033
extern PNG_EXPORT(void,png_set_compression_window_bits)
2034
PNGARG((png_structp png_ptr, int window_bits));
2036
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
2039
/* These next functions are called for input/output, memory, and error
2040
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
2041
* and call standard C I/O routines such as fread(), fwrite(), and
2042
* fprintf(). These functions can be made to use other I/O routines
2043
* at run time for those applications that need to handle I/O in a
2044
* different manner by calling png_set_???_fn(). See libpng.txt for
2048
#ifdef PNG_STDIO_SUPPORTED
2049
/* Initialize the input/output for the PNG file to the default functions. */
2050
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
2053
/* Replace the (error and abort), and warning functions with user
2054
* supplied functions. If no messages are to be printed you must still
2055
* write and use replacement functions. The replacement error_fn should
2056
* still do a longjmp to the last setjmp location if you are using this
2057
* method of error handling. If error_fn or warning_fn is NULL, the
2058
* default function will be used.
2061
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
2062
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
2064
/* Return the user pointer associated with the error functions */
2065
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
2067
/* Replace the default data output functions with a user supplied one(s).
2068
* If buffered output is not used, then output_flush_fn can be set to NULL.
2069
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
2070
* output_flush_fn will be ignored (and thus can be NULL).
2071
* It is probably a mistake to use NULL for output_flush_fn if
2072
* write_data_fn is not also NULL unless you have built libpng with
2073
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
2074
* default flush function, which uses the standard *FILE structure, will
2077
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
2078
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
2080
/* Replace the default data input function with a user supplied one. */
2081
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
2082
png_voidp io_ptr, png_rw_ptr read_data_fn));
2084
/* Return the user pointer associated with the I/O functions */
2085
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
2087
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
2088
png_read_status_ptr read_row_fn));
2090
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
2091
png_write_status_ptr write_row_fn));
2093
#ifdef PNG_USER_MEM_SUPPORTED
2094
/* Replace the default memory allocation functions with user supplied one(s). */
2095
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
2096
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
2097
/* Return the user pointer associated with the memory functions */
2098
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
2101
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2102
defined(PNG_LEGACY_SUPPORTED)
2103
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
2104
png_ptr, png_user_transform_ptr read_user_transform_fn));
2107
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2108
defined(PNG_LEGACY_SUPPORTED)
2109
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
2110
png_ptr, png_user_transform_ptr write_user_transform_fn));
2113
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2114
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
2115
defined(PNG_LEGACY_SUPPORTED)
2116
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
2117
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
2118
int user_transform_channels));
2119
/* Return the user pointer associated with the user transform functions */
2120
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
2121
PNGARG((png_structp png_ptr));
2124
#ifdef PNG_USER_CHUNKS_SUPPORTED
2125
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2126
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2127
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2131
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2132
/* Sets the function callbacks for the push reader, and a pointer to a
2133
* user-defined structure available to the callback functions.
2135
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2136
png_voidp progressive_ptr,
2137
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2138
png_progressive_end_ptr end_fn));
2140
/* Returns the user pointer associated with the push read functions */
2141
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2142
PNGARG((png_structp png_ptr));
2144
/* Function to be called when data becomes available */
2145
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2146
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2148
/* Function that combines rows. Not very much different than the
2149
* png_combine_row() call. Is this even used?????
2151
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2152
png_bytep old_row, png_bytep new_row));
2153
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2155
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2156
png_uint_32 size)) PNG_ALLOCATED;
2159
# define png_malloc_warn png_malloc
2161
/* Added at libpng version 1.2.4 */
2162
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2163
png_uint_32 size)) PNG_ALLOCATED;
2166
/* Frees a pointer allocated by png_malloc() */
2167
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2170
/* Function to allocate memory for zlib. */
2171
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
2174
/* Function to free memory for zlib */
2175
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
2178
/* Free data that was allocated internally */
2179
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2180
png_infop info_ptr, png_uint_32 free_me, int num));
2181
#ifdef PNG_FREE_ME_SUPPORTED
2182
/* Reassign responsibility for freeing existing data, whether allocated
2183
* by libpng or by the application
2185
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2186
png_infop info_ptr, int freer, png_uint_32 mask));
2188
/* Assignments for png_data_freer */
2189
#define PNG_DESTROY_WILL_FREE_DATA 1
2190
#define PNG_SET_WILL_FREE_DATA 1
2191
#define PNG_USER_WILL_FREE_DATA 2
2192
/* Flags for png_ptr->free_me and info_ptr->free_me */
2193
#define PNG_FREE_HIST 0x0008
2194
#define PNG_FREE_ICCP 0x0010
2195
#define PNG_FREE_SPLT 0x0020
2196
#define PNG_FREE_ROWS 0x0040
2197
#define PNG_FREE_PCAL 0x0080
2198
#define PNG_FREE_SCAL 0x0100
2199
#define PNG_FREE_UNKN 0x0200
2200
#define PNG_FREE_LIST 0x0400
2201
#define PNG_FREE_PLTE 0x1000
2202
#define PNG_FREE_TRNS 0x2000
2203
#define PNG_FREE_TEXT 0x4000
2204
#define PNG_FREE_ALL 0x7fff
2205
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2207
#ifdef PNG_USER_MEM_SUPPORTED
2208
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2209
png_uint_32 size)) PNG_ALLOCATED;
2210
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2214
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
2215
png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED;
2217
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
2218
png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED;
2220
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
2221
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
2223
#endif /* USE_FAR_KEYWORD */
2225
#ifndef PNG_NO_ERROR_TEXT
2226
/* Fatal error in PNG image of libpng - can't continue */
2227
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2228
png_const_charp error_message)) PNG_NORETURN;
2230
/* The same, but the chunk name is prepended to the error string. */
2231
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2232
png_const_charp error_message)) PNG_NORETURN;
2234
/* Fatal error in PNG image of libpng - can't continue */
2235
extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
2238
#ifndef PNG_NO_WARNINGS
2239
/* Non-fatal error in libpng. Can continue, but may have a problem. */
2240
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2241
png_const_charp warning_message));
2243
#ifdef PNG_READ_SUPPORTED
2244
/* Non-fatal error in libpng, chunk name is prepended to message. */
2245
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2246
png_const_charp warning_message));
2247
#endif /* PNG_READ_SUPPORTED */
2248
#endif /* PNG_NO_WARNINGS */
2250
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
2251
* Similarly, the png_get_<chunk> calls are used to read values from the
2252
* png_info_struct, either storing the parameters in the passed variables, or
2253
* setting pointers into the png_info_struct where the data is stored. The
2254
* png_get_<chunk> functions return a non-zero value if the data was available
2255
* in info_ptr, or return zero and do not change any of the parameters if the
2256
* data was not available.
2258
* These functions should be used instead of directly accessing png_info
2259
* to avoid problems with future changes in the size and internal layout of
2262
/* Returns "flag" if chunk data is valid in info_ptr. */
2263
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2264
png_infop info_ptr, png_uint_32 flag));
2266
/* Returns number of bytes needed to hold a transformed row. */
2267
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2268
png_infop info_ptr));
2270
#ifdef PNG_INFO_IMAGE_SUPPORTED
2271
/* Returns row_pointers, which is an array of pointers to scanlines that was
2272
* returned from png_read_png().
2274
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2275
png_infop info_ptr));
2276
/* Set row_pointers, which is an array of pointers to scanlines for use
2277
* by png_write_png().
2279
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2280
png_infop info_ptr, png_bytepp row_pointers));
2283
/* Returns number of color channels in image. */
2284
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2285
png_infop info_ptr));
2287
#ifdef PNG_EASY_ACCESS_SUPPORTED
2288
/* Returns image width in pixels. */
2289
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2290
png_ptr, png_infop info_ptr));
2292
/* Returns image height in pixels. */
2293
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2294
png_ptr, png_infop info_ptr));
2296
/* Returns image bit_depth. */
2297
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2298
png_ptr, png_infop info_ptr));
2300
/* Returns image color_type. */
2301
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2302
png_ptr, png_infop info_ptr));
2304
/* Returns image filter_type. */
2305
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2306
png_ptr, png_infop info_ptr));
2308
/* Returns image interlace_type. */
2309
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2310
png_ptr, png_infop info_ptr));
2312
/* Returns image compression_type. */
2313
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2314
png_ptr, png_infop info_ptr));
2316
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
2317
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2318
png_ptr, png_infop info_ptr));
2319
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2320
png_ptr, png_infop info_ptr));
2321
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2322
png_ptr, png_infop info_ptr));
2324
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
2325
#ifdef PNG_FLOATING_POINT_SUPPORTED
2326
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2327
png_ptr, png_infop info_ptr));
2330
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2331
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2332
png_ptr, png_infop info_ptr));
2333
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2334
png_ptr, png_infop info_ptr));
2335
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2336
png_ptr, png_infop info_ptr));
2337
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2338
png_ptr, png_infop info_ptr));
2340
#endif /* PNG_EASY_ACCESS_SUPPORTED */
2342
/* Returns pointer to signature string read from PNG header */
2343
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2344
png_infop info_ptr));
2346
#ifdef PNG_bKGD_SUPPORTED
2347
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2348
png_infop info_ptr, png_color_16p *background));
2351
#ifdef PNG_bKGD_SUPPORTED
2352
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2353
png_infop info_ptr, png_color_16p background));
2356
#ifdef PNG_cHRM_SUPPORTED
2357
#ifdef PNG_FLOATING_POINT_SUPPORTED
2358
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2359
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2360
double *red_y, double *green_x, double *green_y, double *blue_x,
2363
#ifdef PNG_FIXED_POINT_SUPPORTED
2364
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2365
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2366
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2367
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2368
*int_blue_x, png_fixed_point *int_blue_y));
2372
#ifdef PNG_cHRM_SUPPORTED
2373
#ifdef PNG_FLOATING_POINT_SUPPORTED
2374
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2375
png_infop info_ptr, double white_x, double white_y, double red_x,
2376
double red_y, double green_x, double green_y, double blue_x, double blue_y));
2378
#ifdef PNG_FIXED_POINT_SUPPORTED
2379
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2380
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2381
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2382
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2383
png_fixed_point int_blue_y));
2387
#ifdef PNG_gAMA_SUPPORTED
2388
#ifdef PNG_FLOATING_POINT_SUPPORTED
2389
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2390
png_infop info_ptr, double *file_gamma));
2392
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2393
png_infop info_ptr, png_fixed_point *int_file_gamma));
2396
#ifdef PNG_gAMA_SUPPORTED
2397
#ifdef PNG_FLOATING_POINT_SUPPORTED
2398
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2399
png_infop info_ptr, double file_gamma));
2401
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2402
png_infop info_ptr, png_fixed_point int_file_gamma));
2405
#ifdef PNG_hIST_SUPPORTED
2406
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2407
png_infop info_ptr, png_uint_16p *hist));
2410
#ifdef PNG_hIST_SUPPORTED
2411
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2412
png_infop info_ptr, png_uint_16p hist));
2415
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2416
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2417
int *bit_depth, int *color_type, int *interlace_method,
2418
int *compression_method, int *filter_method));
2420
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2421
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2422
int color_type, int interlace_method, int compression_method,
2423
int filter_method));
2425
#ifdef PNG_oFFs_SUPPORTED
2426
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2427
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2431
#ifdef PNG_oFFs_SUPPORTED
2432
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2433
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2437
#ifdef PNG_pCAL_SUPPORTED
2438
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2439
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2440
int *type, int *nparams, png_charp *units, png_charpp *params));
2443
#ifdef PNG_pCAL_SUPPORTED
2444
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2445
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2446
int type, int nparams, png_charp units, png_charpp params));
2449
#ifdef PNG_pHYs_SUPPORTED
2450
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2451
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2454
#ifdef PNG_pHYs_SUPPORTED
2455
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2456
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2459
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2460
png_infop info_ptr, png_colorp *palette, int *num_palette));
2462
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2463
png_infop info_ptr, png_colorp palette, int num_palette));
2465
#ifdef PNG_sBIT_SUPPORTED
2466
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2467
png_infop info_ptr, png_color_8p *sig_bit));
2470
#ifdef PNG_sBIT_SUPPORTED
2471
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2472
png_infop info_ptr, png_color_8p sig_bit));
2475
#ifdef PNG_sRGB_SUPPORTED
2476
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2477
png_infop info_ptr, int *intent));
2480
#ifdef PNG_sRGB_SUPPORTED
2481
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2482
png_infop info_ptr, int intent));
2483
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2484
png_infop info_ptr, int intent));
2487
#ifdef PNG_iCCP_SUPPORTED
2488
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2489
png_infop info_ptr, png_charpp name, int *compression_type,
2490
png_charpp profile, png_uint_32 *proflen));
2491
/* Note to maintainer: profile should be png_bytepp */
2494
#ifdef PNG_iCCP_SUPPORTED
2495
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2496
png_infop info_ptr, png_charp name, int compression_type,
2497
png_charp profile, png_uint_32 proflen));
2498
/* Note to maintainer: profile should be png_bytep */
2501
#ifdef PNG_sPLT_SUPPORTED
2502
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2503
png_infop info_ptr, png_sPLT_tpp entries));
2506
#ifdef PNG_sPLT_SUPPORTED
2507
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2508
png_infop info_ptr, png_sPLT_tp entries, int nentries));
2511
#ifdef PNG_TEXT_SUPPORTED
2512
/* png_get_text also returns the number of text chunks in *num_text */
2513
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2514
png_infop info_ptr, png_textp *text_ptr, int *num_text));
2518
* Note while png_set_text() will accept a structure whose text,
2519
* language, and translated keywords are NULL pointers, the structure
2520
* returned by png_get_text will always contain regular
2521
* zero-terminated C strings. They might be empty strings but
2522
* they will never be NULL pointers.
2525
#ifdef PNG_TEXT_SUPPORTED
2526
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2527
png_infop info_ptr, png_textp text_ptr, int num_text));
2530
#ifdef PNG_tIME_SUPPORTED
2531
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2532
png_infop info_ptr, png_timep *mod_time));
2535
#ifdef PNG_tIME_SUPPORTED
2536
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2537
png_infop info_ptr, png_timep mod_time));
2540
#ifdef PNG_tRNS_SUPPORTED
2541
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2542
png_infop info_ptr, png_bytep *trans, int *num_trans,
2543
png_color_16p *trans_values));
2546
#ifdef PNG_tRNS_SUPPORTED
2547
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2548
png_infop info_ptr, png_bytep trans, int num_trans,
2549
png_color_16p trans_values));
2552
#ifdef PNG_tRNS_SUPPORTED
2555
#ifdef PNG_sCAL_SUPPORTED
2556
#ifdef PNG_FLOATING_POINT_SUPPORTED
2557
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2558
png_infop info_ptr, int *unit, double *width, double *height));
2560
#ifdef PNG_FIXED_POINT_SUPPORTED
2561
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2562
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2565
#endif /* PNG_sCAL_SUPPORTED */
2567
#ifdef PNG_sCAL_SUPPORTED
2568
#ifdef PNG_FLOATING_POINT_SUPPORTED
2569
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2570
png_infop info_ptr, int unit, double width, double height));
2572
#ifdef PNG_FIXED_POINT_SUPPORTED
2573
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2574
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2577
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2579
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2580
/* Provide a list of chunks and how they are to be handled, if the built-in
2581
handling or default unknown chunk handling is not desired. Any chunks not
2582
listed will be handled in the default manner. The IHDR and IEND chunks
2584
keep = 0: follow default behaviour
2586
= 2: keep only if safe-to-copy
2587
= 3: keep even if unsafe-to-copy
2589
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2590
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2591
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2594
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
2595
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2596
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2597
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2598
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2599
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2600
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2603
/* Png_free_data() will turn off the "valid" flag for anything it frees.
2604
* If you need to turn it off for a chunk that your application has freed,
2605
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
2607
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2608
png_infop info_ptr, int mask));
2610
#ifdef PNG_INFO_IMAGE_SUPPORTED
2611
/* The "params" pointer is currently not used and is for future expansion. */
2612
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2616
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2622
/* Define PNG_DEBUG at compile time for debugging information. Higher
2623
* numbers for PNG_DEBUG mean more debugging information. This has
2624
* only been added since version 0.95 so it is not implemented throughout
2625
* libpng yet, but more support will be added as needed.
2629
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2636
#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
2639
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
2642
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
2645
#else /* PNG_DEBUG_FILE || !_MSC_VER */
2646
#ifndef PNG_DEBUG_FILE
2647
#define PNG_DEBUG_FILE stderr
2648
#endif /* PNG_DEBUG_FILE */
2651
/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
2656
# define png_debug(l,m) \
2659
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2660
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2664
# define png_debug1(l,m,p1) \
2667
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2668
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2672
# define png_debug2(l,m,p1,p2) \
2675
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
2676
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2679
# else /* __STDC __ */
2681
# define png_debug(l,m) \
2685
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2686
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2687
m,PNG_STRING_NEWLINE); \
2688
fprintf(PNG_DEBUG_FILE,format); \
2692
# define png_debug1(l,m,p1) \
2696
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2697
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2698
m,PNG_STRING_NEWLINE); \
2699
fprintf(PNG_DEBUG_FILE,format,p1); \
2703
# define png_debug2(l,m,p1,p2) \
2707
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
2708
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
2709
m,PNG_STRING_NEWLINE); \
2710
fprintf(PNG_DEBUG_FILE,format,p1,p2); \
2713
# endif /* __STDC __ */
2714
#endif /* (PNG_DEBUG > 1) */
2716
#endif /* _MSC_VER */
2717
#endif /* (PNG_DEBUG > 0) */
2718
#endif /* PNG_DEBUG */
2720
#define png_debug(l, m)
2723
#define png_debug1(l, m, p1)
2726
#define png_debug2(l, m, p1, p2)
2729
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2730
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2731
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2732
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2734
#ifdef PNG_MNG_FEATURES_SUPPORTED
2735
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2736
png_ptr, png_uint_32 mng_features_permitted));
2739
/* For use in png_set_keep_unknown, added to version 1.2.6 */
2740
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2741
#define PNG_HANDLE_CHUNK_NEVER 1
2742
#define PNG_HANDLE_CHUNK_IF_SAFE 2
2743
#define PNG_HANDLE_CHUNK_ALWAYS 3
2745
/* Added to version 1.2.0 */
2746
#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
2747
#ifdef PNG_MMX_CODE_SUPPORTED
2748
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2749
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2750
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2751
#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2752
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2753
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2754
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2755
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2756
#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2758
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2759
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
2760
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2761
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2762
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2763
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2764
#define PNG_MMX_WRITE_FLAGS ( 0 )
2766
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2767
| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2768
| PNG_MMX_READ_FLAGS \
2769
| PNG_MMX_WRITE_FLAGS )
2771
#define PNG_SELECT_READ 1
2772
#define PNG_SELECT_WRITE 2
2773
#endif /* PNG_MMX_CODE_SUPPORTED */
2777
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2778
PNGARG((int flag_select, int *compilerID));
2781
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2782
PNGARG((int flag_select));
2785
extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2786
PNGARG((png_structp png_ptr));
2789
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2790
PNGARG((png_structp png_ptr));
2793
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2794
PNGARG((png_structp png_ptr));
2797
extern PNG_EXPORT(void,png_set_asm_flags)
2798
PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2801
extern PNG_EXPORT(void,png_set_mmx_thresholds)
2802
PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2803
png_uint_32 mmx_rowbytes_threshold));
2805
#endif /* PNG_1_0_X */
2808
/* png.c, pnggccrd.c, or pngvcrd.c */
2809
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2810
#endif /* PNG_1_0_X */
2811
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2813
/* Strip the prepended error numbers ("#nnn ") from error and warning
2814
* messages before passing them to the error or warning handler.
2816
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2817
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2818
png_ptr, png_uint_32 strip_mode));
2821
/* Added at libpng-1.2.6 */
2822
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
2823
extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2824
png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2825
extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2827
extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2830
/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
2834
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2835
/* With these routines we avoid an integer divide, which will be slower on
2836
* most machines. However, it does take more operations than the corresponding
2837
* divide method, so it may be slower on a few RISC systems. There are two
2838
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2840
* Note that the rounding factors are NOT supposed to be the same! 128 and
2841
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2844
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2847
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2849
# define png_composite(composite, fg, alpha, bg) \
2850
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2851
+ (png_uint_16)(bg)*(png_uint_16)(255 - \
2852
(png_uint_16)(alpha)) + (png_uint_16)128); \
2853
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2855
# define png_composite_16(composite, fg, alpha, bg) \
2856
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2857
+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
2858
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
2859
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2861
#else /* Standard method using integer division */
2863
# define png_composite(composite, fg, alpha, bg) \
2864
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2865
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2866
(png_uint_16)127) / 255)
2868
# define png_composite_16(composite, fg, alpha, bg) \
2869
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2870
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2871
(png_uint_32)32767) / (png_uint_32)65535L)
2873
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2875
/* Inline macros to do direct reads of bytes from the input buffer. These
2876
* require that you are using an architecture that uses PNG byte ordering
2877
* (MSB first) and supports unaligned data storage. I think that PowerPC
2878
* in big-endian mode and 680x0 are the only ones that will support this.
2879
* The x86 line of processors definitely do not. The png_get_int_32()
2880
* routine also assumes we are using two's complement format for negative
2881
* values, which is almost certainly true.
2883
#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED
2884
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2885
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2886
# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2888
extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2889
extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2890
extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2891
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2892
extern PNG_EXPORT(png_uint_32,png_get_uint_31)
2893
PNGARG((png_structp png_ptr, png_bytep buf));
2894
/* No png_get_int_16 -- may be added if there's a real need for it. */
2896
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2898
extern PNG_EXPORT(void,png_save_uint_32)
2899
PNGARG((png_bytep buf, png_uint_32 i));
2900
extern PNG_EXPORT(void,png_save_int_32)
2901
PNGARG((png_bytep buf, png_int_32 i));
2903
/* Place a 16-bit number into a buffer in PNG byte order.
2904
* The parameter is declared unsigned int, not png_uint_16,
2905
* just to avoid potential problems on pre-ANSI C compilers.
2907
extern PNG_EXPORT(void,png_save_uint_16)
2908
PNGARG((png_bytep buf, unsigned int i));
2909
/* No png_save_int_16 -- may be added if there's a real need for it. */
2911
/* ************************************************************************* */
2913
/* These next functions are used internally in the code. They generally
2914
* shouldn't be used unless you are writing code to add or replace some
2915
* functionality in libpng. More information about most functions can
2916
* be found in the files where the functions are located.
2920
/* Various modes of operation, that are visible to applications because
2921
* they are used for unknown chunk location.
2923
#define PNG_HAVE_IHDR 0x01
2924
#define PNG_HAVE_PLTE 0x02
2925
#define PNG_HAVE_IDAT 0x04
2926
#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2927
#define PNG_HAVE_IEND 0x10
2931
/* More modes of operation. Note that after an init, mode is set to
2932
* zero automatically when the structure is created.
2934
#define PNG_HAVE_gAMA 0x20
2935
#define PNG_HAVE_cHRM 0x40
2936
#define PNG_HAVE_sRGB 0x80
2937
#define PNG_HAVE_CHUNK_HEADER 0x100
2938
#define PNG_WROTE_tIME 0x200
2939
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2940
#define PNG_BACKGROUND_IS_GRAY 0x800
2941
#define PNG_HAVE_PNG_SIGNATURE 0x1000
2942
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
2944
/* Flags for the transformations the PNG library does on the image data */
2945
#define PNG_BGR 0x0001
2946
#define PNG_INTERLACE 0x0002
2947
#define PNG_PACK 0x0004
2948
#define PNG_SHIFT 0x0008
2949
#define PNG_SWAP_BYTES 0x0010
2950
#define PNG_INVERT_MONO 0x0020
2951
#define PNG_DITHER 0x0040
2952
#define PNG_BACKGROUND 0x0080
2953
#define PNG_BACKGROUND_EXPAND 0x0100
2955
#define PNG_16_TO_8 0x0400
2956
#define PNG_RGBA 0x0800
2957
#define PNG_EXPAND 0x1000
2958
#define PNG_GAMMA 0x2000
2959
#define PNG_GRAY_TO_RGB 0x4000
2960
#define PNG_FILLER 0x8000L
2961
#define PNG_PACKSWAP 0x10000L
2962
#define PNG_SWAP_ALPHA 0x20000L
2963
#define PNG_STRIP_ALPHA 0x40000L
2964
#define PNG_INVERT_ALPHA 0x80000L
2965
#define PNG_USER_TRANSFORM 0x100000L
2966
#define PNG_RGB_TO_GRAY_ERR 0x200000L
2967
#define PNG_RGB_TO_GRAY_WARN 0x400000L
2968
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2969
/* 0x800000L Unused */
2970
#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2971
#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
2972
#define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */
2974
/* 0x8000000L unused */
2975
/* 0x10000000L unused */
2976
/* 0x20000000L unused */
2977
/* 0x40000000L unused */
2979
/* Flags for png_create_struct */
2980
#define PNG_STRUCT_PNG 0x0001
2981
#define PNG_STRUCT_INFO 0x0002
2983
/* Scaling factor for filter heuristic weighting calculations */
2984
#define PNG_WEIGHT_SHIFT 8
2985
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2986
#define PNG_COST_SHIFT 3
2987
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2989
/* Flags for the png_ptr->flags rather than declaring a byte for each one */
2990
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2991
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2992
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2993
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2994
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2995
#define PNG_FLAG_ZLIB_FINISHED 0x0020
2996
#define PNG_FLAG_ROW_INIT 0x0040
2997
#define PNG_FLAG_FILLER_AFTER 0x0080
2998
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2999
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
3000
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
3001
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
3002
#define PNG_FLAG_FREE_PLTE 0x1000
3003
#define PNG_FLAG_FREE_TRNS 0x2000
3004
#define PNG_FLAG_FREE_HIST 0x4000
3005
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
3006
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
3007
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
3008
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
3009
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
3010
#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
3011
#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
3012
#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
3013
/* 0x800000L unused */
3014
/* 0x1000000L unused */
3015
/* 0x2000000L unused */
3016
/* 0x4000000L unused */
3017
/* 0x8000000L unused */
3018
/* 0x10000000L unused */
3019
/* 0x20000000L unused */
3020
/* 0x40000000L unused */
3022
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
3023
PNG_FLAG_CRC_ANCILLARY_NOWARN)
3025
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
3026
PNG_FLAG_CRC_CRITICAL_IGNORE)
3028
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
3029
PNG_FLAG_CRC_CRITICAL_MASK)
3031
/* Save typing and make code easier to understand */
3033
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
3034
abs((int)((c1).green) - (int)((c2).green)) + \
3035
abs((int)((c1).blue) - (int)((c2).blue)))
3037
/* Added to libpng-1.2.6 JB */
3038
#define PNG_ROWBYTES(pixel_bits, width) \
3039
((pixel_bits) >= 8 ? \
3040
((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
3041
(( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
3043
/* PNG_OUT_OF_RANGE returns true if value is outside the range
3044
* ideal-delta..ideal+delta. Each argument is evaluated twice.
3045
* "ideal" and "delta" should be constants, normally simple
3046
* integers, "value" a variable. Added to libpng-1.2.6 JB
3048
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
3049
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
3051
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
3052
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
3053
/* Place to hold the signature string for a PNG file. */
3054
#ifdef PNG_USE_GLOBAL_ARRAYS
3055
PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
3058
#endif /* PNG_NO_EXTERN */
3060
/* Constant strings for known chunk types. If you need to add a chunk,
3061
* define the name here, and add an invocation of the macro in png.c and
3062
* wherever it's needed.
3064
#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
3065
#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
3066
#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
3067
#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
3068
#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
3069
#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
3070
#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
3071
#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
3072
#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
3073
#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
3074
#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
3075
#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
3076
#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
3077
#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
3078
#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
3079
#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
3080
#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
3081
#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
3082
#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
3083
#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
3084
#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
3086
#ifdef PNG_USE_GLOBAL_ARRAYS
3087
PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
3088
PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
3089
PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
3090
PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
3091
PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
3092
PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
3093
PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
3094
PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
3095
PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
3096
PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
3097
PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
3098
PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
3099
PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
3100
PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
3101
PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
3102
PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
3103
PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
3104
PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
3105
PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
3106
PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
3107
PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
3108
#endif /* PNG_USE_GLOBAL_ARRAYS */
3110
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3111
/* Initialize png_ptr struct for reading, and allocate any other memory.
3112
* (old interface - DEPRECATED - use png_create_read_struct instead).
3114
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr))
3116
#undef png_read_init
3117
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
3118
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3121
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
3122
png_const_charp user_png_ver, png_size_t png_struct_size));
3123
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3124
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
3125
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3129
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
3130
/* Initialize png_ptr struct for writing, and allocate any other memory.
3131
* (old interface - DEPRECATED - use png_create_write_struct instead).
3133
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr))
3135
#undef png_write_init
3136
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
3137
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
3140
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
3141
png_const_charp user_png_ver, png_size_t png_struct_size));
3142
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
3143
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
3146
/* Allocate memory for an internal libpng struct */
3147
PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE;
3149
/* Free memory from internal libpng struct */
3150
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE;
3152
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
3153
malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE;
3154
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
3155
png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE;
3157
/* Free any memory that info_ptr points to and reset struct. */
3158
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
3159
png_infop info_ptr)) PNG_PRIVATE;
3162
/* Function to allocate memory for zlib. */
3163
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items,
3164
uInt size)) PNG_PRIVATE;
3166
/* Function to free memory for zlib */
3167
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE;
3170
/* Function to convert a sizeof an item to png_sizeof item */
3171
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size))
3175
/* Next four functions are used internally as callbacks. PNGAPI is required
3176
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3.
3179
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
3180
png_bytep data, png_size_t length)) PNG_PRIVATE;
3182
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3183
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
3184
png_bytep buffer, png_size_t length)) PNG_PRIVATE;
3187
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
3188
png_bytep data, png_size_t length)) PNG_PRIVATE;
3190
#ifdef PNG_WRITE_FLUSH_SUPPORTED
3191
#ifdef PNG_STDIO_SUPPORTED
3192
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr))
3196
#else /* PNG_1_0_X */
3197
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3198
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
3199
png_bytep buffer, png_size_t length)) PNG_PRIVATE;
3201
#endif /* PNG_1_0_X */
3203
/* Reset the CRC variable */
3204
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3206
/* Write the "data" buffer to whatever output you are using. */
3207
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
3208
png_size_t length)) PNG_PRIVATE;
3210
/* Read data from whatever input you are using into the "data" buffer */
3211
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
3212
png_size_t length)) PNG_PRIVATE;
3214
/* Read bytes into buf, and update png_ptr->crc */
3215
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
3216
png_size_t length)) PNG_PRIVATE;
3218
/* Decompress data in a chunk that uses compression */
3219
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
3220
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
3221
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
3222
int comp_type, png_size_t chunklength,
3223
png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE;
3226
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
3227
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)
3230
/* Read the CRC from the file and compare it to the libpng calculated CRC */
3231
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3233
/* Calculate the CRC over a section of data. Note that we are only
3234
* passing a maximum of 64K on systems that have this as a memory limit,
3235
* since this is the maximum buffer size we can specify.
3237
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
3238
png_size_t length)) PNG_PRIVATE;
3240
#ifdef PNG_WRITE_FLUSH_SUPPORTED
3241
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3244
/* Simple function to write the signature */
3245
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3247
/* Write various chunks */
3249
/* Write the IHDR chunk, and update the png_struct with the necessary
3252
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
3254
int bit_depth, int color_type, int compression_method, int filter_method,
3255
int interlace_method)) PNG_PRIVATE;
3257
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
3258
png_uint_32 num_pal)) PNG_PRIVATE;
3260
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
3261
png_size_t length)) PNG_PRIVATE;
3263
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3265
#ifdef PNG_WRITE_gAMA_SUPPORTED
3266
#ifdef PNG_FLOATING_POINT_SUPPORTED
3267
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma))
3270
#ifdef PNG_FIXED_POINT_SUPPORTED
3271
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr,
3272
png_fixed_point file_gamma)) PNG_PRIVATE;
3276
#ifdef PNG_WRITE_sBIT_SUPPORTED
3277
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
3278
int color_type)) PNG_PRIVATE;
3281
#ifdef PNG_WRITE_cHRM_SUPPORTED
3282
#ifdef PNG_FLOATING_POINT_SUPPORTED
3283
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
3284
double white_x, double white_y,
3285
double red_x, double red_y, double green_x, double green_y,
3286
double blue_x, double blue_y)) PNG_PRIVATE;
3288
#ifdef PNG_FIXED_POINT_SUPPORTED
3289
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
3290
png_fixed_point int_white_x, png_fixed_point int_white_y,
3291
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3292
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3293
png_fixed_point int_blue_y)) PNG_PRIVATE;
3297
#ifdef PNG_WRITE_sRGB_SUPPORTED
3298
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
3299
int intent)) PNG_PRIVATE;
3302
#ifdef PNG_WRITE_iCCP_SUPPORTED
3303
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
3304
png_charp name, int compression_type,
3305
png_charp profile, int proflen)) PNG_PRIVATE;
3306
/* Note to maintainer: profile should be png_bytep */
3309
#ifdef PNG_WRITE_sPLT_SUPPORTED
3310
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
3311
png_sPLT_tp palette)) PNG_PRIVATE;
3314
#ifdef PNG_WRITE_tRNS_SUPPORTED
3315
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
3316
png_color_16p values, int number, int color_type)) PNG_PRIVATE;
3319
#ifdef PNG_WRITE_bKGD_SUPPORTED
3320
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3321
png_color_16p values, int color_type)) PNG_PRIVATE;
3324
#ifdef PNG_WRITE_hIST_SUPPORTED
3325
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3326
int num_hist)) PNG_PRIVATE;
3329
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3330
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3331
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3332
png_charp key, png_charpp new_key)) PNG_PRIVATE;
3335
#ifdef PNG_WRITE_tEXt_SUPPORTED
3336
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3337
png_charp text, png_size_t text_len)) PNG_PRIVATE;
3340
#ifdef PNG_WRITE_zTXt_SUPPORTED
3341
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3342
png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE;
3345
#ifdef PNG_WRITE_iTXt_SUPPORTED
3346
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3347
int compression, png_charp key, png_charp lang, png_charp lang_key,
3348
png_charp text)) PNG_PRIVATE;
3351
#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */
3352
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3353
png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE;
3356
#ifdef PNG_WRITE_oFFs_SUPPORTED
3357
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3358
png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE;
3361
#ifdef PNG_WRITE_pCAL_SUPPORTED
3362
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3363
png_int_32 X0, png_int_32 X1, int type, int nparams,
3364
png_charp units, png_charpp params)) PNG_PRIVATE;
3367
#ifdef PNG_WRITE_pHYs_SUPPORTED
3368
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3369
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3370
int unit_type)) PNG_PRIVATE;
3373
#ifdef PNG_WRITE_tIME_SUPPORTED
3374
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3375
png_timep mod_time)) PNG_PRIVATE;
3378
#ifdef PNG_WRITE_sCAL_SUPPORTED
3379
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3380
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3381
int unit, double width, double height)) PNG_PRIVATE;
3383
#ifdef PNG_FIXED_POINT_SUPPORTED
3384
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3385
int unit, png_charp width, png_charp height)) PNG_PRIVATE;
3390
/* Called when finished processing a row of data */
3391
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3393
/* Internal use only. Called before first row of data */
3394
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3396
#ifdef PNG_READ_GAMMA_SUPPORTED
3397
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3400
/* Combine a row of data, dealing with alpha, etc. if requested */
3401
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3402
int mask)) PNG_PRIVATE;
3404
#ifdef PNG_READ_INTERLACING_SUPPORTED
3405
/* Expand an interlaced row */
3406
/* OLD pre-1.0.9 interface:
3407
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3408
png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE;
3410
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3413
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3415
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
3416
/* Grab pixels out of a row for an interlaced pass */
3417
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3418
png_bytep row, int pass)) PNG_PRIVATE;
3421
/* Unfilter a row */
3422
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3423
png_row_infop row_info, png_bytep row, png_bytep prev_row,
3424
int filter)) PNG_PRIVATE;
3426
/* Choose the best filter to use and filter the row data */
3427
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3428
png_row_infop row_info)) PNG_PRIVATE;
3430
/* Write out the filtered row. */
3431
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3432
png_bytep filtered_row)) PNG_PRIVATE;
3433
/* Finish a row while reading, dealing with interlacing passes, etc. */
3434
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3436
/* Initialize the row buffers, etc. */
3437
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3438
/* Optional call to update the users info structure */
3439
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3440
png_infop info_ptr)) PNG_PRIVATE;
3442
/* These are the functions that do the transformations */
3443
#ifdef PNG_READ_FILLER_SUPPORTED
3444
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3445
png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE;
3448
#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED
3449
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3450
png_bytep row)) PNG_PRIVATE;
3453
#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
3454
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3455
png_bytep row)) PNG_PRIVATE;
3458
#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED
3459
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3460
png_bytep row)) PNG_PRIVATE;
3463
#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
3464
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3465
png_bytep row)) PNG_PRIVATE;
3468
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3469
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3470
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3471
png_bytep row, png_uint_32 flags)) PNG_PRIVATE;
3474
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3475
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info,
3476
png_bytep row)) PNG_PRIVATE;
3479
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3480
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info,
3481
png_bytep row)) PNG_PRIVATE;
3484
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
3485
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3486
row_info, png_bytep row)) PNG_PRIVATE;
3489
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
3490
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3491
png_bytep row)) PNG_PRIVATE;
3494
#ifdef PNG_READ_PACK_SUPPORTED
3495
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info,
3496
png_bytep row)) PNG_PRIVATE;
3499
#ifdef PNG_READ_SHIFT_SUPPORTED
3500
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3501
png_color_8p sig_bits)) PNG_PRIVATE;
3504
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3505
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info,
3506
png_bytep row)) PNG_PRIVATE;
3509
#ifdef PNG_READ_16_TO_8_SUPPORTED
3510
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info,
3511
png_bytep row)) PNG_PRIVATE;
3514
#ifdef PNG_READ_DITHER_SUPPORTED
3515
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3516
png_bytep row, png_bytep palette_lookup,
3517
png_bytep dither_lookup)) PNG_PRIVATE;
3519
# ifdef PNG_CORRECT_PALETTE_SUPPORTED
3520
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3521
png_colorp palette, int num_palette)) PNG_PRIVATE;
3525
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3526
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info,
3527
png_bytep row)) PNG_PRIVATE;
3530
#ifdef PNG_WRITE_PACK_SUPPORTED
3531
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3532
png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE;
3535
#ifdef PNG_WRITE_SHIFT_SUPPORTED
3536
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3537
png_color_8p bit_depth)) PNG_PRIVATE;
3540
#ifdef PNG_READ_BACKGROUND_SUPPORTED
3541
#ifdef PNG_READ_GAMMA_SUPPORTED
3542
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3543
png_color_16p trans_values, png_color_16p background,
3544
png_color_16p background_1,
3545
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3546
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3547
png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE;
3549
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3550
png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE;
3554
#ifdef PNG_READ_GAMMA_SUPPORTED
3555
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3556
png_bytep gamma_table, png_uint_16pp gamma_16_table,
3557
int gamma_shift)) PNG_PRIVATE;
3560
#ifdef PNG_READ_EXPAND_SUPPORTED
3561
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3562
png_bytep row, png_colorp palette, png_bytep trans,
3563
int num_trans)) PNG_PRIVATE;
3564
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3565
png_bytep row, png_color_16p trans_value)) PNG_PRIVATE;
3568
/* The following decodes the appropriate chunks, and does error correction,
3569
* then calls the appropriate callback for the chunk if it is valid.
3572
/* Decode the IHDR chunk */
3573
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3574
png_uint_32 length)) PNG_PRIVATE;
3575
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3576
png_uint_32 length));
3577
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3578
png_uint_32 length));
3580
#ifdef PNG_READ_bKGD_SUPPORTED
3581
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3582
png_uint_32 length)) PNG_PRIVATE;
3585
#ifdef PNG_READ_cHRM_SUPPORTED
3586
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3587
png_uint_32 length)) PNG_PRIVATE;
3590
#ifdef PNG_READ_gAMA_SUPPORTED
3591
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3592
png_uint_32 length)) PNG_PRIVATE;
3595
#ifdef PNG_READ_hIST_SUPPORTED
3596
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3597
png_uint_32 length)) PNG_PRIVATE;
3600
#ifdef PNG_READ_iCCP_SUPPORTED
3601
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3602
png_uint_32 length));
3603
#endif /* PNG_READ_iCCP_SUPPORTED */
3605
#ifdef PNG_READ_iTXt_SUPPORTED
3606
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3607
png_uint_32 length)) PNG_PRIVATE;
3610
#ifdef PNG_READ_oFFs_SUPPORTED
3611
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3612
png_uint_32 length)) PNG_PRIVATE;
3615
#ifdef PNG_READ_pCAL_SUPPORTED
3616
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3617
png_uint_32 length)) PNG_PRIVATE;
3620
#ifdef PNG_READ_pHYs_SUPPORTED
3621
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3622
png_uint_32 length)) PNG_PRIVATE;
3625
#ifdef PNG_READ_sBIT_SUPPORTED
3626
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3627
png_uint_32 length)) PNG_PRIVATE;
3630
#ifdef PNG_READ_sCAL_SUPPORTED
3631
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3632
png_uint_32 length)) PNG_PRIVATE;
3635
#ifdef PNG_READ_sPLT_SUPPORTED
3636
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3637
png_uint_32 length)) PNG_PRIVATE;
3638
#endif /* PNG_READ_sPLT_SUPPORTED */
3640
#ifdef PNG_READ_sRGB_SUPPORTED
3641
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3642
png_uint_32 length)) PNG_PRIVATE;
3645
#ifdef PNG_READ_tEXt_SUPPORTED
3646
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3647
png_uint_32 length)) PNG_PRIVATE;
3650
#ifdef PNG_READ_tIME_SUPPORTED
3651
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3652
png_uint_32 length)) PNG_PRIVATE;
3655
#ifdef PNG_READ_tRNS_SUPPORTED
3656
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3657
png_uint_32 length)) PNG_PRIVATE;
3660
#ifdef PNG_READ_zTXt_SUPPORTED
3661
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3662
png_uint_32 length)) PNG_PRIVATE;
3665
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3666
png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3668
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3669
png_bytep chunk_name)) PNG_PRIVATE;
3671
/* Handle the transformations for reading and writing */
3672
PNG_EXTERN void png_do_read_transformations
3673
PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3674
PNG_EXTERN void png_do_write_transformations
3675
PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3677
PNG_EXTERN void png_init_read_transformations
3678
PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3680
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3681
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3682
png_infop info_ptr)) PNG_PRIVATE;
3683
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3684
png_infop info_ptr)) PNG_PRIVATE;
3685
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3686
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3687
png_uint_32 length)) PNG_PRIVATE;
3688
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3689
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3690
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3691
png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
3692
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3693
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3694
png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE;
3695
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3696
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3697
png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3698
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3699
png_infop info_ptr)) PNG_PRIVATE;
3700
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3701
png_infop info_ptr)) PNG_PRIVATE;
3702
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr,
3703
png_bytep row)) PNG_PRIVATE;
3704
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3705
png_infop info_ptr)) PNG_PRIVATE;
3706
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3707
png_infop info_ptr)) PNG_PRIVATE;
3708
PNG_EXTERN void png_read_push_finish_row
3709
PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3710
#ifdef PNG_READ_tEXt_SUPPORTED
3711
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3712
png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3713
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3714
png_infop info_ptr)) PNG_PRIVATE;
3716
#ifdef PNG_READ_zTXt_SUPPORTED
3717
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3718
png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3719
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3720
png_infop info_ptr)) PNG_PRIVATE;
3722
#ifdef PNG_READ_iTXt_SUPPORTED
3723
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3724
png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE;
3725
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3726
png_infop info_ptr)) PNG_PRIVATE;
3729
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3731
#ifdef PNG_MNG_FEATURES_SUPPORTED
3732
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3733
png_bytep row)) PNG_PRIVATE;
3734
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3735
png_bytep row)) PNG_PRIVATE;
3738
#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
3739
#ifdef PNG_MMX_CODE_SUPPORTED
3740
/* png.c */ /* PRIVATE */
3741
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3746
/* The following six functions will be exported in libpng-1.4.0. */
3747
#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
3748
PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
3749
png_infop info_ptr));
3751
PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
3752
png_infop info_ptr));
3754
PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
3755
png_infop info_ptr));
3757
PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
3758
png_infop info_ptr));
3760
PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
3761
png_infop info_ptr));
3763
#ifdef PNG_pHYs_SUPPORTED
3764
PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
3765
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
3766
#endif /* PNG_pHYs_SUPPORTED */
3767
#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
3769
/* Read the chunk header (length + type name) */
3770
PNG_EXTERN png_uint_32 png_read_chunk_header
3771
PNGARG((png_structp png_ptr)) PNG_PRIVATE;
3773
/* Added at libpng version 1.2.34 */
3774
#ifdef PNG_cHRM_SUPPORTED
3775
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
3776
png_fixed_point int_white_x, png_fixed_point int_white_y,
3777
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
3778
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
3779
png_fixed_point int_blue_y)) PNG_PRIVATE;
3782
#ifdef PNG_cHRM_SUPPORTED
3783
#ifdef PNG_CHECK_cHRM_SUPPORTED
3784
/* Added at libpng version 1.2.34 */
3785
PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2,
3786
unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE;
3790
/* Added at libpng version 1.2.41 */
3791
PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr,
3792
png_uint_32 width, png_uint_32 height, int bit_depth,
3793
int color_type, int interlace_type, int compression_type,
3794
int filter_type)) PNG_PRIVATE;
3796
/* Added at libpng version 1.2.41 */
3797
PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr,
3800
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3802
#endif /* PNG_INTERNAL */
3808
#endif /* PNG_VERSION_INFO_ONLY */
3809
/* Do not put anything past this line */
added
removed
Externals/libpng/png.h
