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/* png.h - header file for PNG reference library
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*
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* libpng version 1.5.13 - September 27, 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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*
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* This code is released under the libpng license (See LICENSE, below)
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*
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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 1.5.13 - September 27, 2012: Glenn
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* See also "Contributing Authors", below.
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*
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* Note about libpng version numbers:
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*
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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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*
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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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* 0.98 0.98 98 2.0.98
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* 0.99 0.99 98 2.0.99
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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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* 1.0.3 10003
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* 1.0.3a-d 10004
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* 1.0.4 10004
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* 1.0.4a-f 10005
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* 1.0.5 (+ 2 patches) 10005
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* 1.0.5a-d 10006
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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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* 1.0.6g 10007
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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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* 1.0.6i 10007 10.6i
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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 12.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 12.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 12.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 12.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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* 1.2.10beta1-7 13 10210 12.so.0.10[.0]
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* 1.2.10rc1-2 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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* 1.4.0beta1-5 14 10400 14.so.0.0[.0]
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* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
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* 1.4.0beta7-8 14 10400 14.so.0.0[.0]
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* 1.2.11 13 10211 12.so.0.11[.0]
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* 1.2.12 13 10212 12.so.0.12[.0]
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* 1.4.0beta9-14 14 10400 14.so.0.0[.0]
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* 1.2.13 13 10213 12.so.0.13[.0]
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* 1.4.0beta15-36 14 10400 14.so.0.0[.0]
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* 1.4.0beta37-87 14 10400 14.so.14.0[.0]
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* 1.4.0rc01 14 10400 14.so.14.0[.0]
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* 1.4.0beta88-109 14 10400 14.so.14.0[.0]
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* 1.4.0rc02-08 14 10400 14.so.14.0[.0]
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* 1.4.0 14 10400 14.so.14.0[.0]
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* 1.4.1beta01-03 14 10401 14.so.14.1[.0]
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* 1.4.1rc01 14 10401 14.so.14.1[.0]
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* 1.4.1beta04-12 14 10401 14.so.14.1[.0]
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* 1.4.1 14 10401 14.so.14.1[.0]
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* 1.4.2 14 10402 14.so.14.2[.0]
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* 1.4.3 14 10403 14.so.14.3[.0]
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* 1.4.4 14 10404 14.so.14.4[.0]
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* 1.5.0beta01-58 15 10500 15.so.15.0[.0]
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* 1.5.0rc01-07 15 10500 15.so.15.0[.0]
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* 1.5.0 15 10500 15.so.15.0[.0]
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* 1.5.1beta01-11 15 10501 15.so.15.1[.0]
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* 1.5.1rc01-02 15 10501 15.so.15.1[.0]
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* 1.5.1 15 10501 15.so.15.1[.0]
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* 1.5.2beta01-03 15 10502 15.so.15.2[.0]
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* 1.5.2rc01-03 15 10502 15.so.15.2[.0]
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* 1.5.2 15 10502 15.so.15.2[.0]
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* 1.5.3beta01-10 15 10503 15.so.15.3[.0]
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* 1.5.3rc01-02 15 10503 15.so.15.3[.0]
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* 1.5.3beta11 15 10503 15.so.15.3[.0]
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* 1.5.3 [omitted]
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* 1.5.4beta01-08 15 10504 15.so.15.4[.0]
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* 1.5.4rc01 15 10504 15.so.15.4[.0]
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* 1.5.4 15 10504 15.so.15.4[.0]
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* 1.5.5beta01-08 15 10505 15.so.15.5[.0]
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* 1.5.5rc01 15 10505 15.so.15.5[.0]
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* 1.5.5 15 10505 15.so.15.5[.0]
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* 1.5.6beta01-07 15 10506 15.so.15.6[.0]
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* 1.5.6rc01-03 15 10506 15.so.15.6[.0]
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* 1.5.6 15 10506 15.so.15.6[.0]
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* 1.5.7beta01-05 15 10507 15.so.15.7[.0]
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* 1.5.7rc01-03 15 10507 15.so.15.7[.0]
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* 1.5.7 15 10507 15.so.15.7[.0]
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* 1.5.8beta01 15 10508 15.so.15.8[.0]
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* 1.5.8rc01 15 10508 15.so.15.8[.0]
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* 1.5.8 15 10508 15.so.15.8[.0]
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* 1.5.9beta01-02 15 10509 15.so.15.9[.0]
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* 1.5.9rc01 15 10509 15.so.15.9[.0]
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* 1.5.9 15 10509 15.so.15.9[.0]
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* 1.5.10beta01-05 15 10510 15.so.15.10[.0]
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* 1.5.10 15 10510 15.so.15.10[.0]
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* 1.5.11beta01 15 10511 15.so.15.11[.0]
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* 1.5.11rc01-05 15 10511 15.so.15.11[.0]
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* 1.5.11 15 10511 15.so.15.11[.0]
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* 1.5.12 15 10512 15.so.15.12[.0]
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* 1.5.13beta01-02 15 10513 15.so.15.13[.0]
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* 1.5.13rc01 15 10513 15.so.15.13[.0]
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* 1.5.13 15 10513 15.so.15.13[.0]
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*
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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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*
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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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*
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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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*
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* See libpng-manual.txt or libpng.3 for more information. The PNG
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* specification is available as a W3C Recommendation and as an ISO
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* Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
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*/
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/*
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* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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*
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* If you modify libpng you may insert additional notices immediately following
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* this sentence.
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*
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* This code is released under the libpng license.
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*
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* libpng versions 1.2.6, August 15, 2004, through 1.5.13, September 27, 2012, are
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* Copyright (c) 2004, 2006-2012 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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*
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* Cosmin Truta
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*
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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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*
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* Simon-Pierre Cadieux
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* Eric S. Raymond
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* Gilles Vollant
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*
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* and with the following additions to the disclaimer:
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*
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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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* the user.
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*
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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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*
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* Tom Lane
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* Glenn Randers-Pehrson
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* Willem van Schaik
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*
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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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*
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* John Bowler
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|
255 |
* Kevin Bracey
|
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|
256 |
* Sam Bushell
|
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|
257 |
* Magnus Holmgren
|
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|
258 |
* Greg Roelofs
|
|
|
259 |
* Tom Tanner
|
|
|
260 |
*
|
|
|
261 |
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
|
|
|
262 |
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
|
|
263 |
*
|
|
|
264 |
* For the purposes of this copyright and license, "Contributing Authors"
|
|
|
265 |
* is defined as the following set of individuals:
|
|
|
266 |
*
|
|
|
267 |
* Andreas Dilger
|
|
|
268 |
* Dave Martindale
|
|
|
269 |
* Guy Eric Schalnat
|
|
|
270 |
* Paul Schmidt
|
|
|
271 |
* Tim Wegner
|
|
|
272 |
*
|
|
|
273 |
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
|
|
274 |
* and Group 42, Inc. disclaim all warranties, expressed or implied,
|
|
|
275 |
* including, without limitation, the warranties of merchantability and of
|
|
|
276 |
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
|
|
277 |
* assume no liability for direct, indirect, incidental, special, exemplary,
|
|
|
278 |
* or consequential damages, which may result from the use of the PNG
|
|
|
279 |
* Reference Library, even if advised of the possibility of such damage.
|
|
|
280 |
*
|
|
|
281 |
* Permission is hereby granted to use, copy, modify, and distribute this
|
|
|
282 |
* source code, or portions hereof, for any purpose, without fee, subject
|
|
|
283 |
* to the following restrictions:
|
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|
284 |
*
|
|
|
285 |
* 1. The origin of this source code must not be misrepresented.
|
|
|
286 |
*
|
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|
287 |
* 2. Altered versions must be plainly marked as such and must not
|
|
|
288 |
* be misrepresented as being the original source.
|
|
|
289 |
*
|
|
|
290 |
* 3. This Copyright notice may not be removed or altered from
|
|
|
291 |
* any source or altered source distribution.
|
|
|
292 |
*
|
|
|
293 |
* The Contributing Authors and Group 42, Inc. specifically permit, without
|
|
|
294 |
* fee, and encourage the use of this source code as a component to
|
|
|
295 |
* supporting the PNG file format in commercial products. If you use this
|
|
|
296 |
* source code in a product, acknowledgment is not required but would be
|
|
|
297 |
* appreciated.
|
|
|
298 |
*/
|
|
|
299 |
|
|
|
300 |
/*
|
|
|
301 |
* A "png_get_copyright" function is available, for convenient use in "about"
|
|
|
302 |
* boxes and the like:
|
|
|
303 |
*
|
|
|
304 |
* printf("%s", png_get_copyright(NULL));
|
|
|
305 |
*
|
|
|
306 |
* Also, the PNG logo (in PNG format, of course) is supplied in the
|
|
|
307 |
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
|
|
|
308 |
*/
|
|
|
309 |
|
|
|
310 |
/*
|
|
|
311 |
* Libpng is OSI Certified Open Source Software. OSI Certified is a
|
|
|
312 |
* certification mark of the Open Source Initiative.
|
|
|
313 |
*/
|
|
|
314 |
|
|
|
315 |
/*
|
|
|
316 |
* The contributing authors would like to thank all those who helped
|
|
|
317 |
* with testing, bug fixes, and patience. This wouldn't have been
|
|
|
318 |
* possible without all of you.
|
|
|
319 |
*
|
|
|
320 |
* Thanks to Frank J. T. Wojcik for helping with the documentation.
|
|
|
321 |
*/
|
|
|
322 |
|
|
|
323 |
/*
|
|
|
324 |
* Y2K compliance in libpng:
|
|
|
325 |
* =========================
|
|
|
326 |
*
|
|
|
327 |
* September 27, 2012
|
|
|
328 |
*
|
|
|
329 |
* Since the PNG Development group is an ad-hoc body, we can't make
|
|
|
330 |
* an official declaration.
|
|
|
331 |
*
|
|
|
332 |
* This is your unofficial assurance that libpng from version 0.71 and
|
|
|
333 |
* upward through 1.5.13 are Y2K compliant. It is my belief that
|
|
|
334 |
* earlier versions were also Y2K compliant.
|
|
|
335 |
*
|
|
|
336 |
* Libpng only has two year fields. One is a 2-byte unsigned integer
|
|
|
337 |
* that will hold years up to 65535. The other holds the date in text
|
|
|
338 |
* format, and will hold years up to 9999.
|
|
|
339 |
*
|
|
|
340 |
* The integer is
|
|
|
341 |
* "png_uint_16 year" in png_time_struct.
|
|
|
342 |
*
|
|
|
343 |
* The string is
|
|
|
344 |
* "char time_buffer[29]" in png_struct. This will be no
|
|
|
345 |
* longer used in libpng-1.6.0 and will be removed from libpng-1.7.0.
|
|
|
346 |
*
|
|
|
347 |
* There are seven time-related functions:
|
|
|
348 |
* png.c: png_convert_to_rfc_1123() in png.c
|
|
|
349 |
* (formerly png_convert_to_rfc_1152() in error)
|
|
|
350 |
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
|
|
|
351 |
* png_convert_from_time_t() in pngwrite.c
|
|
|
352 |
* png_get_tIME() in pngget.c
|
|
|
353 |
* png_handle_tIME() in pngrutil.c, called in pngread.c
|
|
|
354 |
* png_set_tIME() in pngset.c
|
|
|
355 |
* png_write_tIME() in pngwutil.c, called in pngwrite.c
|
|
|
356 |
*
|
|
|
357 |
* All handle dates properly in a Y2K environment. The
|
|
|
358 |
* png_convert_from_time_t() function calls gmtime() to convert from system
|
|
|
359 |
* clock time, which returns (year - 1900), which we properly convert to
|
|
|
360 |
* the full 4-digit year. There is a possibility that applications using
|
|
|
361 |
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
|
|
|
362 |
* function, or that they are incorrectly passing only a 2-digit year
|
|
|
363 |
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
|
|
|
364 |
* but this is not under our control. The libpng documentation has always
|
|
|
365 |
* stated that it works with 4-digit years, and the APIs have been
|
|
|
366 |
* documented as such.
|
|
|
367 |
*
|
|
|
368 |
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|
|
369 |
* integer to hold the year, and can hold years as large as 65535.
|
|
|
370 |
*
|
|
|
371 |
* zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|
|
372 |
* no date-related code.
|
|
|
373 |
*
|
|
|
374 |
* Glenn Randers-Pehrson
|
|
|
375 |
* libpng maintainer
|
|
|
376 |
* PNG Development Group
|
|
|
377 |
*/
|
|
|
378 |
|
|
|
379 |
#ifndef PNG_H
|
|
|
380 |
#define PNG_H
|
|
|
381 |
|
|
|
382 |
/* This is not the place to learn how to use libpng. The file libpng-manual.txt
|
|
|
383 |
* describes how to use libpng, and the file example.c summarizes it
|
|
|
384 |
* with some code on which to build. This file is useful for looking
|
|
|
385 |
* at the actual function definitions and structure components.
|
|
|
386 |
*
|
|
|
387 |
* If you just need to read a PNG file and don't want to read the documentation
|
|
|
388 |
* skip to the end of this file and read the section entitled 'simplified API'.
|
|
|
389 |
*/
|
|
|
390 |
|
|
|
391 |
/* Version information for png.h - this should match the version in png.c */
|
|
|
392 |
#define PNG_LIBPNG_VER_STRING "1.5.13"
|
|
|
393 |
#define PNG_HEADER_VERSION_STRING \
|
|
|
394 |
" libpng version 1.5.13 - September 27, 2012\n"
|
|
|
395 |
|
|
|
396 |
#define PNG_LIBPNG_VER_SONUM 15
|
|
|
397 |
#define PNG_LIBPNG_VER_DLLNUM 15
|
|
|
398 |
|
|
|
399 |
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
|
|
|
400 |
#define PNG_LIBPNG_VER_MAJOR 1
|
|
|
401 |
#define PNG_LIBPNG_VER_MINOR 5
|
|
|
402 |
#define PNG_LIBPNG_VER_RELEASE 13
|
|
|
403 |
|
|
|
404 |
/* This should match the numeric part of the final component of
|
|
|
405 |
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
|
|
|
406 |
*/
|
|
|
407 |
|
|
|
408 |
#define PNG_LIBPNG_VER_BUILD 0
|
|
|
409 |
|
|
|
410 |
/* Release Status */
|
|
|
411 |
#define PNG_LIBPNG_BUILD_ALPHA 1
|
|
|
412 |
#define PNG_LIBPNG_BUILD_BETA 2
|
|
|
413 |
#define PNG_LIBPNG_BUILD_RC 3
|
|
|
414 |
#define PNG_LIBPNG_BUILD_STABLE 4
|
|
|
415 |
#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
|
|
|
416 |
|
|
|
417 |
/* Release-Specific Flags */
|
|
|
418 |
#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
|
|
|
419 |
PNG_LIBPNG_BUILD_STABLE only */
|
|
|
420 |
#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
|
|
|
421 |
PNG_LIBPNG_BUILD_SPECIAL */
|
|
|
422 |
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
|
|
|
423 |
PNG_LIBPNG_BUILD_PRIVATE */
|
|
|
424 |
|
|
|
425 |
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
|
|
|
426 |
|
|
|
427 |
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
|
|
|
428 |
* We must not include leading zeros.
|
|
|
429 |
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
|
|
|
430 |
* version 1.0.0 was mis-numbered 100 instead of 10000). From
|
|
|
431 |
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
|
|
|
432 |
*/
|
|
|
433 |
#define PNG_LIBPNG_VER 10513 /* 1.5.13 */
|
|
|
434 |
|
|
|
435 |
/* Library configuration: these options cannot be changed after
|
|
|
436 |
* the library has been built.
|
|
|
437 |
*/
|
|
|
438 |
#ifndef PNGLCONF_H
|
|
|
439 |
/* If pnglibconf.h is missing, you can
|
|
|
440 |
* copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
|
|
|
441 |
*/
|
|
|
442 |
# include "pnglibconf.h"
|
|
|
443 |
#endif
|
|
|
444 |
|
|
|
445 |
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
446 |
# ifndef PNG_BUILDING_SYMBOL_TABLE
|
|
|
447 |
/*
|
|
|
448 |
* Standard header files (not needed for the version info or while
|
|
|
449 |
* building symbol table -- see scripts/pnglibconf.dfa)
|
|
|
450 |
*/
|
|
|
451 |
# ifdef PNG_SETJMP_SUPPORTED
|
|
|
452 |
# include <setjmp.h>
|
|
|
453 |
# endif
|
|
|
454 |
|
|
|
455 |
/* Need the time information for converting tIME chunks, it
|
|
|
456 |
* defines struct tm:
|
|
|
457 |
*/
|
|
|
458 |
# ifdef PNG_CONVERT_tIME_SUPPORTED
|
|
|
459 |
/* "time.h" functions are not supported on all operating systems */
|
|
|
460 |
# include <time.h>
|
|
|
461 |
# endif
|
|
|
462 |
# endif
|
|
|
463 |
|
|
|
464 |
/* Machine specific configuration. */
|
|
|
465 |
# include "pngconf.h"
|
|
|
466 |
#endif
|
|
|
467 |
|
|
|
468 |
/*
|
|
|
469 |
* Added at libpng-1.2.8
|
|
|
470 |
*
|
|
|
471 |
* Ref MSDN: Private as priority over Special
|
|
|
472 |
* VS_FF_PRIVATEBUILD File *was not* built using standard release
|
|
|
473 |
* procedures. If this value is given, the StringFileInfo block must
|
|
|
474 |
* contain a PrivateBuild string.
|
|
|
475 |
*
|
|
|
476 |
* VS_FF_SPECIALBUILD File *was* built by the original company using
|
|
|
477 |
* standard release procedures but is a variation of the standard
|
|
|
478 |
* file of the same version number. If this value is given, the
|
|
|
479 |
* StringFileInfo block must contain a SpecialBuild string.
|
|
|
480 |
*/
|
|
|
481 |
|
|
|
482 |
#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
|
|
|
483 |
# define PNG_LIBPNG_BUILD_TYPE \
|
|
|
484 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
|
|
|
485 |
#else
|
|
|
486 |
# ifdef PNG_LIBPNG_SPECIALBUILD
|
|
|
487 |
# define PNG_LIBPNG_BUILD_TYPE \
|
|
|
488 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
|
|
|
489 |
# else
|
|
|
490 |
# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
|
|
|
491 |
# endif
|
|
|
492 |
#endif
|
|
|
493 |
|
|
|
494 |
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
495 |
|
|
|
496 |
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
|
497 |
#ifdef __cplusplus
|
|
|
498 |
extern "C" {
|
|
|
499 |
#endif /* __cplusplus */
|
|
|
500 |
|
|
|
501 |
/* Version information for C files, stored in png.c. This had better match
|
|
|
502 |
* the version above.
|
|
|
503 |
*/
|
|
|
504 |
#define png_libpng_ver png_get_header_ver(NULL)
|
|
|
505 |
|
|
|
506 |
/* This file is arranged in several sections:
|
|
|
507 |
*
|
|
|
508 |
* 1. Any configuration options that can be specified by for the application
|
|
|
509 |
* code when it is built. (Build time configuration is in pnglibconf.h)
|
|
|
510 |
* 2. Type definitions (base types are defined in pngconf.h), structure
|
|
|
511 |
* definitions.
|
|
|
512 |
* 3. Exported library functions.
|
|
|
513 |
*
|
|
|
514 |
* The library source code has additional files (principally pngpriv.h) that
|
|
|
515 |
* allow configuration of the library.
|
|
|
516 |
*/
|
|
|
517 |
/* Section 1: run time configuration
|
|
|
518 |
* See pnglibconf.h for build time configuration
|
|
|
519 |
*
|
|
|
520 |
* Run time configuration allows the application to choose between
|
|
|
521 |
* implementations of certain arithmetic APIs. The default is set
|
|
|
522 |
* at build time and recorded in pnglibconf.h, but it is safe to
|
|
|
523 |
* override these (and only these) settings. Note that this won't
|
|
|
524 |
* change what the library does, only application code, and the
|
|
|
525 |
* settings can (and probably should) be made on a per-file basis
|
|
|
526 |
* by setting the #defines before including png.h
|
|
|
527 |
*
|
|
|
528 |
* Use macros to read integers from PNG data or use the exported
|
|
|
529 |
* functions?
|
|
|
530 |
* PNG_USE_READ_MACROS: use the macros (see below) Note that
|
|
|
531 |
* the macros evaluate their argument multiple times.
|
|
|
532 |
* PNG_NO_USE_READ_MACROS: call the relevant library function.
|
|
|
533 |
*
|
|
|
534 |
* Use the alternative algorithm for compositing alpha samples that
|
|
|
535 |
* does not use division?
|
|
|
536 |
* PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
|
|
|
537 |
* algorithm.
|
|
|
538 |
* PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
|
|
|
539 |
*
|
|
|
540 |
* How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
|
|
|
541 |
* false?
|
|
|
542 |
* PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
|
|
|
543 |
* APIs to png_warning.
|
|
|
544 |
* Otherwise the calls are mapped to png_error.
|
|
|
545 |
*/
|
|
|
546 |
|
|
|
547 |
/* Section 2: type definitions, including structures and compile time
|
|
|
548 |
* constants.
|
|
|
549 |
* See pngconf.h for base types that vary by machine/system
|
|
|
550 |
*/
|
|
|
551 |
|
|
|
552 |
/* This triggers a compiler error in png.c, if png.c and png.h
|
|
|
553 |
* do not agree upon the version number.
|
|
|
554 |
*/
|
|
|
555 |
typedef char* png_libpng_version_1_5_13;
|
|
|
556 |
|
|
|
557 |
/* Three color definitions. The order of the red, green, and blue, (and the
|
|
|
558 |
* exact size) is not important, although the size of the fields need to
|
|
|
559 |
* be png_byte or png_uint_16 (as defined below).
|
|
|
560 |
*/
|
|
|
561 |
typedef struct png_color_struct
|
|
|
562 |
{
|
|
|
563 |
png_byte red;
|
|
|
564 |
png_byte green;
|
|
|
565 |
png_byte blue;
|
|
|
566 |
} png_color;
|
|
|
567 |
typedef png_color FAR * png_colorp;
|
|
|
568 |
typedef PNG_CONST png_color FAR * png_const_colorp;
|
|
|
569 |
typedef png_color FAR * FAR * png_colorpp;
|
|
|
570 |
|
|
|
571 |
typedef struct png_color_16_struct
|
|
|
572 |
{
|
|
|
573 |
png_byte index; /* used for palette files */
|
|
|
574 |
png_uint_16 red; /* for use in red green blue files */
|
|
|
575 |
png_uint_16 green;
|
|
|
576 |
png_uint_16 blue;
|
|
|
577 |
png_uint_16 gray; /* for use in grayscale files */
|
|
|
578 |
} png_color_16;
|
|
|
579 |
typedef png_color_16 FAR * png_color_16p;
|
|
|
580 |
typedef PNG_CONST png_color_16 FAR * png_const_color_16p;
|
|
|
581 |
typedef png_color_16 FAR * FAR * png_color_16pp;
|
|
|
582 |
|
|
|
583 |
typedef struct png_color_8_struct
|
|
|
584 |
{
|
|
|
585 |
png_byte red; /* for use in red green blue files */
|
|
|
586 |
png_byte green;
|
|
|
587 |
png_byte blue;
|
|
|
588 |
png_byte gray; /* for use in grayscale files */
|
|
|
589 |
png_byte alpha; /* for alpha channel files */
|
|
|
590 |
} png_color_8;
|
|
|
591 |
typedef png_color_8 FAR * png_color_8p;
|
|
|
592 |
typedef PNG_CONST png_color_8 FAR * png_const_color_8p;
|
|
|
593 |
typedef png_color_8 FAR * FAR * png_color_8pp;
|
|
|
594 |
|
|
|
595 |
/*
|
|
|
596 |
* The following two structures are used for the in-core representation
|
|
|
597 |
* of sPLT chunks.
|
|
|
598 |
*/
|
|
|
599 |
typedef struct png_sPLT_entry_struct
|
|
|
600 |
{
|
|
|
601 |
png_uint_16 red;
|
|
|
602 |
png_uint_16 green;
|
|
|
603 |
png_uint_16 blue;
|
|
|
604 |
png_uint_16 alpha;
|
|
|
605 |
png_uint_16 frequency;
|
|
|
606 |
} png_sPLT_entry;
|
|
|
607 |
typedef png_sPLT_entry FAR * png_sPLT_entryp;
|
|
|
608 |
typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;
|
|
|
609 |
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
|
|
|
610 |
|
|
|
611 |
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
|
|
|
612 |
* occupy the LSB of their respective members, and the MSB of each member
|
|
|
613 |
* is zero-filled. The frequency member always occupies the full 16 bits.
|
|
|
614 |
*/
|
|
|
615 |
|
|
|
616 |
typedef struct png_sPLT_struct
|
|
|
617 |
{
|
|
|
618 |
png_charp name; /* palette name */
|
|
|
619 |
png_byte depth; /* depth of palette samples */
|
|
|
620 |
png_sPLT_entryp entries; /* palette entries */
|
|
|
621 |
png_int_32 nentries; /* number of palette entries */
|
|
|
622 |
} png_sPLT_t;
|
|
|
623 |
typedef png_sPLT_t FAR * png_sPLT_tp;
|
|
|
624 |
typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;
|
|
|
625 |
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
|
|
|
626 |
|
|
|
627 |
#ifdef PNG_TEXT_SUPPORTED
|
|
|
628 |
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
|
|
|
629 |
* and whether that contents is compressed or not. The "key" field
|
|
|
630 |
* points to a regular zero-terminated C string. The "text" fields can be a
|
|
|
631 |
* regular C string, an empty string, or a NULL pointer.
|
|
|
632 |
* However, the structure returned by png_get_text() will always contain
|
|
|
633 |
* the "text" field as a regular zero-terminated C string (possibly
|
|
|
634 |
* empty), never a NULL pointer, so it can be safely used in printf() and
|
|
|
635 |
* other string-handling functions. Note that the "itxt_length", "lang", and
|
|
|
636 |
* "lang_key" members of the structure only exist when the library is built
|
|
|
637 |
* with iTXt chunk support. Prior to libpng-1.4.0 the library was built by
|
|
|
638 |
* default without iTXt support. Also note that when iTXt *is* supported,
|
|
|
639 |
* the "lang" and "lang_key" fields contain NULL pointers when the
|
|
|
640 |
* "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
|
|
|
641 |
* PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
|
|
|
642 |
* same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
|
|
|
643 |
* which is always 0 or 1, or its "compression method" which is always 0.
|
|
|
644 |
*/
|
|
|
645 |
typedef struct png_text_struct
|
|
|
646 |
{
|
|
|
647 |
int compression; /* compression value:
|
|
|
648 |
-1: tEXt, none
|
|
|
649 |
0: zTXt, deflate
|
|
|
650 |
1: iTXt, none
|
|
|
651 |
2: iTXt, deflate */
|
|
|
652 |
png_charp key; /* keyword, 1-79 character description of "text" */
|
|
|
653 |
png_charp text; /* comment, may be an empty string (ie "")
|
|
|
654 |
or a NULL pointer */
|
|
|
655 |
png_size_t text_length; /* length of the text string */
|
|
|
656 |
png_size_t itxt_length; /* length of the itxt string */
|
|
|
657 |
png_charp lang; /* language code, 0-79 characters
|
|
|
658 |
or a NULL pointer */
|
|
|
659 |
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
|
|
|
660 |
chars or a NULL pointer */
|
|
|
661 |
} png_text;
|
|
|
662 |
typedef png_text FAR * png_textp;
|
|
|
663 |
typedef PNG_CONST png_text FAR * png_const_textp;
|
|
|
664 |
typedef png_text FAR * FAR * png_textpp;
|
|
|
665 |
#endif
|
|
|
666 |
|
|
|
667 |
/* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|
|
668 |
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
|
|
|
669 |
#define PNG_TEXT_COMPRESSION_NONE_WR -3
|
|
|
670 |
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
|
|
|
671 |
#define PNG_TEXT_COMPRESSION_NONE -1
|
|
|
672 |
#define PNG_TEXT_COMPRESSION_zTXt 0
|
|
|
673 |
#define PNG_ITXT_COMPRESSION_NONE 1
|
|
|
674 |
#define PNG_ITXT_COMPRESSION_zTXt 2
|
|
|
675 |
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
|
|
|
676 |
|
|
|
677 |
/* png_time is a way to hold the time in an machine independent way.
|
|
|
678 |
* Two conversions are provided, both from time_t and struct tm. There
|
|
|
679 |
* is no portable way to convert to either of these structures, as far
|
|
|
680 |
* as I know. If you know of a portable way, send it to me. As a side
|
|
|
681 |
* note - PNG has always been Year 2000 compliant!
|
|
|
682 |
*/
|
|
|
683 |
typedef struct png_time_struct
|
|
|
684 |
{
|
|
|
685 |
png_uint_16 year; /* full year, as in, 1995 */
|
|
|
686 |
png_byte month; /* month of year, 1 - 12 */
|
|
|
687 |
png_byte day; /* day of month, 1 - 31 */
|
|
|
688 |
png_byte hour; /* hour of day, 0 - 23 */
|
|
|
689 |
png_byte minute; /* minute of hour, 0 - 59 */
|
|
|
690 |
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|
|
691 |
} png_time;
|
|
|
692 |
typedef png_time FAR * png_timep;
|
|
|
693 |
typedef PNG_CONST png_time FAR * png_const_timep;
|
|
|
694 |
typedef png_time FAR * FAR * png_timepp;
|
|
|
695 |
|
|
|
696 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
|
|
|
697 |
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|
|
698 |
/* png_unknown_chunk is a structure to hold queued chunks for which there is
|
|
|
699 |
* no specific support. The idea is that we can use this to queue
|
|
|
700 |
* up private chunks for output even though the library doesn't actually
|
|
|
701 |
* know about their semantics.
|
|
|
702 |
*/
|
|
|
703 |
typedef struct png_unknown_chunk_t
|
|
|
704 |
{
|
|
|
705 |
png_byte name[5];
|
|
|
706 |
png_byte *data;
|
|
|
707 |
png_size_t size;
|
|
|
708 |
|
|
|
709 |
/* libpng-using applications should NOT directly modify this byte. */
|
|
|
710 |
png_byte location; /* mode of operation at read time */
|
|
|
711 |
}
|
|
|
712 |
|
|
|
713 |
|
|
|
714 |
png_unknown_chunk;
|
|
|
715 |
typedef png_unknown_chunk FAR * png_unknown_chunkp;
|
|
|
716 |
typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;
|
|
|
717 |
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
|
|
|
718 |
#endif
|
|
|
719 |
|
|
|
720 |
/* Values for the unknown chunk location byte */
|
|
|
721 |
|
|
|
722 |
#define PNG_HAVE_IHDR 0x01
|
|
|
723 |
#define PNG_HAVE_PLTE 0x02
|
|
|
724 |
#define PNG_AFTER_IDAT 0x08
|
|
|
725 |
|
|
|
726 |
/* The complete definition of png_info has, as of libpng-1.5.0,
|
|
|
727 |
* been moved into a separate header file that is not accessible to
|
|
|
728 |
* applications. Read libpng-manual.txt or libpng.3 for more info.
|
|
|
729 |
*/
|
|
|
730 |
typedef struct png_info_def png_info;
|
|
|
731 |
typedef png_info FAR * png_infop;
|
|
|
732 |
typedef PNG_CONST png_info FAR * png_const_infop;
|
|
|
733 |
typedef png_info FAR * FAR * png_infopp;
|
|
|
734 |
|
|
|
735 |
/* Maximum positive integer used in PNG is (2^31)-1 */
|
|
|
736 |
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
|
|
|
737 |
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
|
|
|
738 |
#define PNG_SIZE_MAX ((png_size_t)(-1))
|
|
|
739 |
|
|
|
740 |
/* These are constants for fixed point values encoded in the
|
|
|
741 |
* PNG specification manner (x100000)
|
|
|
742 |
*/
|
|
|
743 |
#define PNG_FP_1 100000
|
|
|
744 |
#define PNG_FP_HALF 50000
|
|
|
745 |
#define PNG_FP_MAX ((png_fixed_point)0x7fffffffL)
|
|
|
746 |
#define PNG_FP_MIN (-PNG_FP_MAX)
|
|
|
747 |
|
|
|
748 |
/* These describe the color_type field in png_info. */
|
|
|
749 |
/* color type masks */
|
|
|
750 |
#define PNG_COLOR_MASK_PALETTE 1
|
|
|
751 |
#define PNG_COLOR_MASK_COLOR 2
|
|
|
752 |
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
753 |
|
|
|
754 |
/* color types. Note that not all combinations are legal */
|
|
|
755 |
#define PNG_COLOR_TYPE_GRAY 0
|
|
|
756 |
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
|
757 |
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
|
758 |
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
|
759 |
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
|
760 |
/* aliases */
|
|
|
761 |
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
|
|
|
762 |
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
|
|
|
763 |
|
|
|
764 |
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
|
|
|
765 |
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
|
|
|
766 |
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
|
|
|
767 |
|
|
|
768 |
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
|
|
|
769 |
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
|
|
|
770 |
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
|
|
|
771 |
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
|
|
|
772 |
|
|
|
773 |
/* These are for the interlacing type. These values should NOT be changed. */
|
|
|
774 |
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
|
|
|
775 |
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
|
|
|
776 |
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
|
|
|
777 |
|
|
|
778 |
/* These are for the oFFs chunk. These values should NOT be changed. */
|
|
|
779 |
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
|
|
|
780 |
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
|
|
|
781 |
#define PNG_OFFSET_LAST 2 /* Not a valid value */
|
|
|
782 |
|
|
|
783 |
/* These are for the pCAL chunk. These values should NOT be changed. */
|
|
|
784 |
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
|
|
|
785 |
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
|
|
|
786 |
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
|
|
|
787 |
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
|
|
|
788 |
#define PNG_EQUATION_LAST 4 /* Not a valid value */
|
|
|
789 |
|
|
|
790 |
/* These are for the sCAL chunk. These values should NOT be changed. */
|
|
|
791 |
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
|
|
|
792 |
#define PNG_SCALE_METER 1 /* meters per pixel */
|
|
|
793 |
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
|
|
|
794 |
#define PNG_SCALE_LAST 3 /* Not a valid value */
|
|
|
795 |
|
|
|
796 |
/* These are for the pHYs chunk. These values should NOT be changed. */
|
|
|
797 |
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
|
|
|
798 |
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
|
|
|
799 |
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
|
|
|
800 |
|
|
|
801 |
/* These are for the sRGB chunk. These values should NOT be changed. */
|
|
|
802 |
#define PNG_sRGB_INTENT_PERCEPTUAL 0
|
|
|
803 |
#define PNG_sRGB_INTENT_RELATIVE 1
|
|
|
804 |
#define PNG_sRGB_INTENT_SATURATION 2
|
|
|
805 |
#define PNG_sRGB_INTENT_ABSOLUTE 3
|
|
|
806 |
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
|
|
|
807 |
|
|
|
808 |
/* This is for text chunks */
|
|
|
809 |
#define PNG_KEYWORD_MAX_LENGTH 79
|
|
|
810 |
|
|
|
811 |
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
|
|
|
812 |
#define PNG_MAX_PALETTE_LENGTH 256
|
|
|
813 |
|
|
|
814 |
/* These determine if an ancillary chunk's data has been successfully read
|
|
|
815 |
* from the PNG header, or if the application has filled in the corresponding
|
|
|
816 |
* data in the info_struct to be written into the output file. The values
|
|
|
817 |
* of the PNG_INFO_<chunk> defines should NOT be changed.
|
|
|
818 |
*/
|
|
|
819 |
#define PNG_INFO_gAMA 0x0001
|
|
|
820 |
#define PNG_INFO_sBIT 0x0002
|
|
|
821 |
#define PNG_INFO_cHRM 0x0004
|
|
|
822 |
#define PNG_INFO_PLTE 0x0008
|
|
|
823 |
#define PNG_INFO_tRNS 0x0010
|
|
|
824 |
#define PNG_INFO_bKGD 0x0020
|
|
|
825 |
#define PNG_INFO_hIST 0x0040
|
|
|
826 |
#define PNG_INFO_pHYs 0x0080
|
|
|
827 |
#define PNG_INFO_oFFs 0x0100
|
|
|
828 |
#define PNG_INFO_tIME 0x0200
|
|
|
829 |
#define PNG_INFO_pCAL 0x0400
|
|
|
830 |
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
|
|
|
831 |
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
|
|
|
832 |
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
|
|
|
833 |
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
|
|
|
834 |
#define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */
|
|
|
835 |
|
|
|
836 |
/* This is used for the transformation routines, as some of them
|
|
|
837 |
* change these values for the row. It also should enable using
|
|
|
838 |
* the routines for other purposes.
|
|
|
839 |
*/
|
|
|
840 |
typedef struct png_row_info_struct
|
|
|
841 |
{
|
|
|
842 |
png_uint_32 width; /* width of row */
|
|
|
843 |
png_size_t rowbytes; /* number of bytes in row */
|
|
|
844 |
png_byte color_type; /* color type of row */
|
|
|
845 |
png_byte bit_depth; /* bit depth of row */
|
|
|
846 |
png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|
|
847 |
png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|
|
848 |
} png_row_info;
|
|
|
849 |
|
|
|
850 |
typedef png_row_info FAR * png_row_infop;
|
|
|
851 |
typedef png_row_info FAR * FAR * png_row_infopp;
|
|
|
852 |
|
|
|
853 |
/* The complete definition of png_struct has, as of libpng-1.5.0,
|
|
|
854 |
* been moved into a separate header file that is not accessible to
|
|
|
855 |
* applications. Read libpng-manual.txt or libpng.3 for more info.
|
|
|
856 |
*/
|
|
|
857 |
typedef struct png_struct_def png_struct;
|
|
|
858 |
typedef PNG_CONST png_struct FAR * png_const_structp;
|
|
|
859 |
typedef png_struct FAR * png_structp;
|
|
|
860 |
|
|
|
861 |
/* These are the function types for the I/O functions and for the functions
|
|
|
862 |
* that allow the user to override the default I/O functions with his or her
|
|
|
863 |
* own. The png_error_ptr type should match that of user-supplied warning
|
|
|
864 |
* and error functions, while the png_rw_ptr type should match that of the
|
|
|
865 |
* user read/write data functions. Note that the 'write' function must not
|
|
|
866 |
* modify the buffer it is passed. The 'read' function, on the other hand, is
|
|
|
867 |
* expected to return the read data in the buffer.
|
|
|
868 |
*/
|
|
|
869 |
typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
|
|
|
870 |
typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
|
|
|
871 |
typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
|
|
|
872 |
typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
|
|
|
873 |
int));
|
|
|
874 |
typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
|
|
|
875 |
int));
|
|
|
876 |
|
|
|
877 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
878 |
typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
|
|
|
879 |
typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
|
|
|
880 |
|
|
|
881 |
/* The following callback receives png_uint_32 row_number, int pass for the
|
|
|
882 |
* png_bytep data of the row. When transforming an interlaced image the
|
|
|
883 |
* row number is the row number within the sub-image of the interlace pass, so
|
|
|
884 |
* the value will increase to the height of the sub-image (not the full image)
|
|
|
885 |
* then reset to 0 for the next pass.
|
|
|
886 |
*
|
|
|
887 |
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
|
|
|
888 |
* find the output pixel (x,y) given an interlaced sub-image pixel
|
|
|
889 |
* (row,col,pass). (See below for these macros.)
|
|
|
890 |
*/
|
|
|
891 |
typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
|
|
|
892 |
png_uint_32, int));
|
|
|
893 |
#endif
|
|
|
894 |
|
|
|
895 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
896 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
|
897 |
typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
|
|
|
898 |
png_bytep));
|
|
|
899 |
#endif
|
|
|
900 |
|
|
|
901 |
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
|
902 |
typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
|
|
|
903 |
png_unknown_chunkp));
|
|
|
904 |
#endif
|
|
|
905 |
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|
|
906 |
typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));
|
|
|
907 |
#endif
|
|
|
908 |
|
|
|
909 |
#ifdef PNG_SETJMP_SUPPORTED
|
|
|
910 |
/* This must match the function definition in <setjmp.h>, and the application
|
|
|
911 |
* must include this before png.h to obtain the definition of jmp_buf. The
|
|
|
912 |
* function is required to be PNG_NORETURN, but this is not checked. If the
|
|
|
913 |
* function does return the application will crash via an abort() or similar
|
|
|
914 |
* system level call.
|
|
|
915 |
*
|
|
|
916 |
* If you get a warning here while building the library you may need to make
|
|
|
917 |
* changes to ensure that pnglibconf.h records the calling convention used by
|
|
|
918 |
* your compiler. This may be very difficult - try using a different compiler
|
|
|
919 |
* to build the library!
|
|
|
920 |
*/
|
|
|
921 |
PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
|
|
|
922 |
#endif
|
|
|
923 |
|
|
|
924 |
/* Transform masks for the high-level interface */
|
|
|
925 |
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
|
|
|
926 |
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
|
|
|
927 |
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
|
|
|
928 |
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
|
|
|
929 |
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
|
|
|
930 |
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
|
|
|
931 |
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
|
|
|
932 |
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
|
|
|
933 |
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
|
|
|
934 |
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
|
|
|
935 |
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
|
|
|
936 |
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
|
|
|
937 |
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */
|
|
|
938 |
/* Added to libpng-1.2.34 */
|
|
|
939 |
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
|
|
|
940 |
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
|
|
|
941 |
/* Added to libpng-1.4.0 */
|
|
|
942 |
#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
|
|
|
943 |
/* Added to libpng-1.5.4 */
|
|
|
944 |
#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */
|
|
|
945 |
#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */
|
|
|
946 |
|
|
|
947 |
/* Flags for MNG supported features */
|
|
|
948 |
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
|
|
|
949 |
#define PNG_FLAG_MNG_FILTER_64 0x04
|
|
|
950 |
#define PNG_ALL_MNG_FEATURES 0x05
|
|
|
951 |
|
|
|
952 |
/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
|
|
|
953 |
* this allowed the zlib default functions to be used on Windows
|
|
|
954 |
* platforms. In 1.5 the zlib default malloc (which just calls malloc and
|
|
|
955 |
* ignores the first argument) should be completely compatible with the
|
|
|
956 |
* following.
|
|
|
957 |
*/
|
|
|
958 |
typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
|
|
|
959 |
png_alloc_size_t));
|
|
|
960 |
typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
|
|
|
961 |
|
|
|
962 |
typedef png_struct FAR * FAR * png_structpp;
|
|
|
963 |
|
|
|
964 |
/* Section 3: exported functions
|
|
|
965 |
* Here are the function definitions most commonly used. This is not
|
|
|
966 |
* the place to find out how to use libpng. See libpng-manual.txt for the
|
|
|
967 |
* full explanation, see example.c for the summary. This just provides
|
|
|
968 |
* a simple one line description of the use of each function.
|
|
|
969 |
*
|
|
|
970 |
* The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
|
|
|
971 |
* pngconf.h and in the *.dfn files in the scripts directory.
|
|
|
972 |
*
|
|
|
973 |
* PNG_EXPORT(ordinal, type, name, (args));
|
|
|
974 |
*
|
|
|
975 |
* ordinal: ordinal that is used while building
|
|
|
976 |
* *.def files. The ordinal value is only
|
|
|
977 |
* relevant when preprocessing png.h with
|
|
|
978 |
* the *.dfn files for building symbol table
|
|
|
979 |
* entries, and are removed by pngconf.h.
|
|
|
980 |
* type: return type of the function
|
|
|
981 |
* name: function name
|
|
|
982 |
* args: function arguments, with types
|
|
|
983 |
*
|
|
|
984 |
* When we wish to append attributes to a function prototype we use
|
|
|
985 |
* the PNG_EXPORTA() macro instead.
|
|
|
986 |
*
|
|
|
987 |
* PNG_EXPORTA(ordinal, type, name, (args), attributes);
|
|
|
988 |
*
|
|
|
989 |
* ordinal, type, name, and args: same as in PNG_EXPORT().
|
|
|
990 |
* attributes: function attributes
|
|
|
991 |
*/
|
|
|
992 |
|
|
|
993 |
/* Returns the version number of the library */
|
|
|
994 |
PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
|
|
|
995 |
|
|
|
996 |
/* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|
|
997 |
* Handling more than 8 bytes from the beginning of the file is an error.
|
|
|
998 |
*/
|
|
|
999 |
PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));
|
|
|
1000 |
|
|
|
1001 |
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|
|
1002 |
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|
|
1003 |
* signature, and non-zero otherwise. Having num_to_check == 0 or
|
|
|
1004 |
* start > 7 will always fail (ie return non-zero).
|
|
|
1005 |
*/
|
|
|
1006 |
PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
|
|
|
1007 |
png_size_t num_to_check));
|
|
|
1008 |
|
|
|
1009 |
/* Simple signature checking function. This is the same as calling
|
|
|
1010 |
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
|
|
|
1011 |
*/
|
|
|
1012 |
#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
|
|
|
1013 |
|
|
|
1014 |
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|
|
1015 |
PNG_EXPORTA(4, png_structp, png_create_read_struct,
|
|
|
1016 |
(png_const_charp user_png_ver, png_voidp error_ptr,
|
|
|
1017 |
png_error_ptr error_fn, png_error_ptr warn_fn),
|
|
|
1018 |
PNG_ALLOCATED);
|
|
|
1019 |
|
|
|
1020 |
/* Allocate and initialize png_ptr struct for writing, and any other memory */
|
|
|
1021 |
PNG_EXPORTA(5, png_structp, png_create_write_struct,
|
|
|
1022 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
|
1023 |
png_error_ptr warn_fn),
|
|
|
1024 |
PNG_ALLOCATED);
|
|
|
1025 |
|
|
|
1026 |
PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
|
|
|
1027 |
(png_const_structp png_ptr));
|
|
|
1028 |
|
|
|
1029 |
PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
|
|
|
1030 |
png_size_t size));
|
|
|
1031 |
|
|
|
1032 |
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
|
|
|
1033 |
* match up.
|
|
|
1034 |
*/
|
|
|
1035 |
#ifdef PNG_SETJMP_SUPPORTED
|
|
|
1036 |
/* This function returns the jmp_buf built in to *png_ptr. It must be
|
|
|
1037 |
* supplied with an appropriate 'longjmp' function to use on that jmp_buf
|
|
|
1038 |
* unless the default error function is overridden in which case NULL is
|
|
|
1039 |
* acceptable. The size of the jmp_buf is checked against the actual size
|
|
|
1040 |
* allocated by the library - the call will return NULL on a mismatch
|
|
|
1041 |
* indicating an ABI mismatch.
|
|
|
1042 |
*/
|
|
|
1043 |
PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
|
|
|
1044 |
png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
|
|
|
1045 |
# define png_jmpbuf(png_ptr) \
|
|
|
1046 |
(*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
|
|
|
1047 |
#else
|
|
|
1048 |
# define png_jmpbuf(png_ptr) \
|
|
|
1049 |
(LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
|
|
|
1050 |
#endif
|
|
|
1051 |
/* This function should be used by libpng applications in place of
|
|
|
1052 |
* longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it
|
|
|
1053 |
* will use it; otherwise it will call PNG_ABORT(). This function was
|
|
|
1054 |
* added in libpng-1.5.0.
|
|
|
1055 |
*/
|
|
|
1056 |
PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
|
|
|
1057 |
PNG_NORETURN);
|
|
|
1058 |
|
|
|
1059 |
#ifdef PNG_READ_SUPPORTED
|
|
|
1060 |
/* Reset the compression stream */
|
|
|
1061 |
PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr));
|
|
|
1062 |
#endif
|
|
|
1063 |
|
|
|
1064 |
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
|
|
|
1065 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
1066 |
PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
|
|
|
1067 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
|
1068 |
png_error_ptr warn_fn,
|
|
|
1069 |
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
|
|
|
1070 |
PNG_ALLOCATED);
|
|
|
1071 |
PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
|
|
|
1072 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
|
1073 |
png_error_ptr warn_fn,
|
|
|
1074 |
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
|
|
|
1075 |
PNG_ALLOCATED);
|
|
|
1076 |
#endif
|
|
|
1077 |
|
|
|
1078 |
/* Write the PNG file signature. */
|
|
|
1079 |
PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
|
|
|
1080 |
|
|
|
1081 |
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|
|
1082 |
PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
|
|
|
1083 |
chunk_name, png_const_bytep data, png_size_t length));
|
|
|
1084 |
|
|
|
1085 |
/* Write the start of a PNG chunk - length and chunk name. */
|
|
|
1086 |
PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
|
|
|
1087 |
png_const_bytep chunk_name, png_uint_32 length));
|
|
|
1088 |
|
|
|
1089 |
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|
|
1090 |
PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
|
|
|
1091 |
png_const_bytep data, png_size_t length));
|
|
|
1092 |
|
|
|
1093 |
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|
|
1094 |
PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));
|
|
|
1095 |
|
|
|
1096 |
/* Allocate and initialize the info structure */
|
|
|
1097 |
PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
|
|
|
1098 |
PNG_ALLOCATED);
|
|
|
1099 |
|
|
|
1100 |
PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,
|
|
|
1101 |
png_size_t png_info_struct_size));
|
|
|
1102 |
|
|
|
1103 |
/* Writes all the PNG information before the image. */
|
|
|
1104 |
PNG_EXPORT(20, void, png_write_info_before_PLTE,
|
|
|
1105 |
(png_structp png_ptr, png_infop info_ptr));
|
|
|
1106 |
PNG_EXPORT(21, void, png_write_info,
|
|
|
1107 |
(png_structp png_ptr, png_infop info_ptr));
|
|
|
1108 |
|
|
|
1109 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1110 |
/* Read the information before the actual image data. */
|
|
|
1111 |
PNG_EXPORT(22, void, png_read_info,
|
|
|
1112 |
(png_structp png_ptr, png_infop info_ptr));
|
|
|
1113 |
#endif
|
|
|
1114 |
|
|
|
1115 |
#ifdef PNG_TIME_RFC1123_SUPPORTED
|
|
|
1116 |
PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
|
|
|
1117 |
(png_structp png_ptr,
|
|
|
1118 |
png_const_timep ptime));
|
|
|
1119 |
#endif
|
|
|
1120 |
|
|
|
1121 |
#ifdef PNG_CONVERT_tIME_SUPPORTED
|
|
|
1122 |
/* Convert from a struct tm to png_time */
|
|
|
1123 |
PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
|
|
|
1124 |
PNG_CONST struct tm FAR * ttime));
|
|
|
1125 |
|
|
|
1126 |
/* Convert from time_t to png_time. Uses gmtime() */
|
|
|
1127 |
PNG_EXPORT(25, void, png_convert_from_time_t,
|
|
|
1128 |
(png_timep ptime, time_t ttime));
|
|
|
1129 |
#endif /* PNG_CONVERT_tIME_SUPPORTED */
|
|
|
1130 |
|
|
|
1131 |
#ifdef PNG_READ_EXPAND_SUPPORTED
|
|
|
1132 |
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
|
|
|
1133 |
PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
|
|
|
1134 |
PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
|
|
|
1135 |
PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
|
|
|
1136 |
PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));
|
|
|
1137 |
#endif
|
|
|
1138 |
|
|
|
1139 |
#ifdef PNG_READ_EXPAND_16_SUPPORTED
|
|
|
1140 |
/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
|
|
|
1141 |
* of a tRNS chunk if present.
|
|
|
1142 |
*/
|
|
|
1143 |
PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));
|
|
|
1144 |
#endif
|
|
|
1145 |
|
|
|
1146 |
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
|
1147 |
/* Use blue, green, red order for pixels. */
|
|
|
1148 |
PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
|
|
|
1149 |
#endif
|
|
|
1150 |
|
|
|
1151 |
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
|
|
|
1152 |
/* Expand the grayscale to 24-bit RGB if necessary. */
|
|
|
1153 |
PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
|
|
|
1154 |
#endif
|
|
|
1155 |
|
|
|
1156 |
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|
|
1157 |
/* Reduce RGB to grayscale. */
|
|
|
1158 |
#define PNG_ERROR_ACTION_NONE 1
|
|
|
1159 |
#define PNG_ERROR_ACTION_WARN 2
|
|
|
1160 |
#define PNG_ERROR_ACTION_ERROR 3
|
|
|
1161 |
#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
|
|
|
1162 |
|
|
|
1163 |
PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
|
|
|
1164 |
int error_action, double red, double green))
|
|
|
1165 |
PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr,
|
|
|
1166 |
int error_action, png_fixed_point red, png_fixed_point green))
|
|
|
1167 |
|
|
|
1168 |
PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
|
|
|
1169 |
png_ptr));
|
|
|
1170 |
#endif
|
|
|
1171 |
|
|
|
1172 |
#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
|
|
|
1173 |
PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
|
|
|
1174 |
png_colorp palette));
|
|
|
1175 |
#endif
|
|
|
1176 |
|
|
|
1177 |
#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
|
|
|
1178 |
/* How the alpha channel is interpreted - this affects how the color channels of
|
|
|
1179 |
* a PNG file are returned when an alpha channel, or tRNS chunk in a palette
|
|
|
1180 |
* file, is present.
|
|
|
1181 |
*
|
|
|
1182 |
* This has no effect on the way pixels are written into a PNG output
|
|
|
1183 |
* datastream. The color samples in a PNG datastream are never premultiplied
|
|
|
1184 |
* with the alpha samples.
|
|
|
1185 |
*
|
|
|
1186 |
* The default is to return data according to the PNG specification: the alpha
|
|
|
1187 |
* channel is a linear measure of the contribution of the pixel to the
|
|
|
1188 |
* corresponding composited pixel. The gamma encoded color channels must be
|
|
|
1189 |
* scaled according to the contribution and to do this it is necessary to undo
|
|
|
1190 |
* the encoding, scale the color values, perform the composition and reencode
|
|
|
1191 |
* the values. This is the 'PNG' mode.
|
|
|
1192 |
*
|
|
|
1193 |
* The alternative is to 'associate' the alpha with the color information by
|
|
|
1194 |
* storing color channel values that have been scaled by the alpha. The
|
|
|
1195 |
* advantage is that the color channels can be resampled (the image can be
|
|
|
1196 |
* scaled) in this form. The disadvantage is that normal practice is to store
|
|
|
1197 |
* linear, not (gamma) encoded, values and this requires 16-bit channels for
|
|
|
1198 |
* still images rather than the 8-bit channels that are just about sufficient if
|
|
|
1199 |
* gamma encoding is used. In addition all non-transparent pixel values,
|
|
|
1200 |
* including completely opaque ones, must be gamma encoded to produce the final
|
|
|
1201 |
* image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
|
|
|
1202 |
* latter being the two common names for associated alpha color channels.)
|
|
|
1203 |
*
|
|
|
1204 |
* Since it is not necessary to perform arithmetic on opaque color values so
|
|
|
1205 |
* long as they are not to be resampled and are in the final color space it is
|
|
|
1206 |
* possible to optimize the handling of alpha by storing the opaque pixels in
|
|
|
1207 |
* the PNG format (adjusted for the output color space) while storing partially
|
|
|
1208 |
* opaque pixels in the standard, linear, format. The accuracy required for
|
|
|
1209 |
* standard alpha composition is relatively low, because the pixels are
|
|
|
1210 |
* isolated, therefore typically the accuracy loss in storing 8-bit linear
|
|
|
1211 |
* values is acceptable. (This is not true if the alpha channel is used to
|
|
|
1212 |
* simulate transparency over large areas - use 16 bits or the PNG mode in
|
|
|
1213 |
* this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is
|
|
|
1214 |
* treated as opaque only if the alpha value is equal to the maximum value.
|
|
|
1215 |
*
|
|
|
1216 |
* The final choice is to gamma encode the alpha channel as well. This is
|
|
|
1217 |
* broken because, in practice, no implementation that uses this choice
|
|
|
1218 |
* correctly undoes the encoding before handling alpha composition. Use this
|
|
|
1219 |
* choice only if other serious errors in the software or hardware you use
|
|
|
1220 |
* mandate it; the typical serious error is for dark halos to appear around
|
|
|
1221 |
* opaque areas of the composited PNG image because of arithmetic overflow.
|
|
|
1222 |
*
|
|
|
1223 |
* The API function png_set_alpha_mode specifies which of these choices to use
|
|
|
1224 |
* with an enumerated 'mode' value and the gamma of the required output:
|
|
|
1225 |
*/
|
|
|
1226 |
#define PNG_ALPHA_PNG 0 /* according to the PNG standard */
|
|
|
1227 |
#define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */
|
|
|
1228 |
#define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */
|
|
|
1229 |
#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
|
|
|
1230 |
#define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */
|
|
|
1231 |
#define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */
|
|
|
1232 |
|
|
|
1233 |
PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode,
|
|
|
1234 |
double output_gamma))
|
|
|
1235 |
PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr,
|
|
|
1236 |
int mode, png_fixed_point output_gamma))
|
|
|
1237 |
#endif
|
|
|
1238 |
|
|
|
1239 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
|
|
|
1240 |
/* The output_gamma value is a screen gamma in libpng terminology: it expresses
|
|
|
1241 |
* how to decode the output values, not how they are encoded. The values used
|
|
|
1242 |
* correspond to the normal numbers used to describe the overall gamma of a
|
|
|
1243 |
* computer display system; for example 2.2 for an sRGB conformant system. The
|
|
|
1244 |
* values are scaled by 100000 in the _fixed version of the API (so 220000 for
|
|
|
1245 |
* sRGB.)
|
|
|
1246 |
*
|
|
|
1247 |
* The inverse of the value is always used to provide a default for the PNG file
|
|
|
1248 |
* encoding if it has no gAMA chunk and if png_set_gamma() has not been called
|
|
|
1249 |
* to override the PNG gamma information.
|
|
|
1250 |
*
|
|
|
1251 |
* When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
|
|
|
1252 |
* opaque pixels however pixels with lower alpha values are not encoded,
|
|
|
1253 |
* regardless of the output gamma setting.
|
|
|
1254 |
*
|
|
|
1255 |
* When the standard Porter Duff handling is requested with mode 1 the output
|
|
|
1256 |
* encoding is set to be linear and the output_gamma value is only relevant
|
|
|
1257 |
* as a default for input data that has no gamma information. The linear output
|
|
|
1258 |
* encoding will be overridden if png_set_gamma() is called - the results may be
|
|
|
1259 |
* highly unexpected!
|
|
|
1260 |
*
|
|
|
1261 |
* The following numbers are derived from the sRGB standard and the research
|
|
|
1262 |
* behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of
|
|
|
1263 |
* 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing
|
|
|
1264 |
* correction required to take account of any differences in the color
|
|
|
1265 |
* environment of the original scene and the intended display environment; the
|
|
|
1266 |
* value expresses how to *decode* the image for display, not how the original
|
|
|
1267 |
* data was *encoded*.
|
|
|
1268 |
*
|
|
|
1269 |
* sRGB provides a peg for the PNG standard by defining a viewing environment.
|
|
|
1270 |
* sRGB itself, and earlier TV standards, actually use a more complex transform
|
|
|
1271 |
* (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is
|
|
|
1272 |
* limited to simple power laws.) By saying that an image for direct display on
|
|
|
1273 |
* an sRGB conformant system should be stored with a gAMA chunk value of 45455
|
|
|
1274 |
* (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
|
|
|
1275 |
* makes it possible to derive values for other display systems and
|
|
|
1276 |
* environments.
|
|
|
1277 |
*
|
|
|
1278 |
* The Mac value is deduced from the sRGB based on an assumption that the actual
|
|
|
1279 |
* extra viewing correction used in early Mac display systems was implemented as
|
|
|
1280 |
* a power 1.45 lookup table.
|
|
|
1281 |
*
|
|
|
1282 |
* Any system where a programmable lookup table is used or where the behavior of
|
|
|
1283 |
* the final display device characteristics can be changed requires system
|
|
|
1284 |
* specific code to obtain the current characteristic. However this can be
|
|
|
1285 |
* difficult and most PNG gamma correction only requires an approximate value.
|
|
|
1286 |
*
|
|
|
1287 |
* By default, if png_set_alpha_mode() is not called, libpng assumes that all
|
|
|
1288 |
* values are unencoded, linear, values and that the output device also has a
|
|
|
1289 |
* linear characteristic. This is only very rarely correct - it is invariably
|
|
|
1290 |
* better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
|
|
|
1291 |
* default if you don't know what the right answer is!
|
|
|
1292 |
*
|
|
|
1293 |
* The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
|
|
|
1294 |
* 10.6) which used a correction table to implement a somewhat lower gamma on an
|
|
|
1295 |
* otherwise sRGB system.
|
|
|
1296 |
*
|
|
|
1297 |
* Both these values are reserved (not simple gamma values) in order to allow
|
|
|
1298 |
* more precise correction internally in the future.
|
|
|
1299 |
*
|
|
|
1300 |
* NOTE: the following values can be passed to either the fixed or floating
|
|
|
1301 |
* point APIs, but the floating point API will also accept floating point
|
|
|
1302 |
* values.
|
|
|
1303 |
*/
|
|
|
1304 |
#define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */
|
|
|
1305 |
#define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */
|
|
|
1306 |
#define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */
|
|
|
1307 |
#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */
|
|
|
1308 |
#endif
|
|
|
1309 |
|
|
|
1310 |
/* The following are examples of calls to png_set_alpha_mode to achieve the
|
|
|
1311 |
* required overall gamma correction and, where necessary, alpha
|
|
|
1312 |
* premultiplication.
|
|
|
1313 |
*
|
|
|
1314 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
|
|
|
1315 |
* This is the default libpng handling of the alpha channel - it is not
|
|
|
1316 |
* pre-multiplied into the color components. In addition the call states
|
|
|
1317 |
* that the output is for a sRGB system and causes all PNG files without gAMA
|
|
|
1318 |
* chunks to be assumed to be encoded using sRGB.
|
|
|
1319 |
*
|
|
|
1320 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
|
|
|
1321 |
* In this case the output is assumed to be something like an sRGB conformant
|
|
|
1322 |
* display preceeded by a power-law lookup table of power 1.45. This is how
|
|
|
1323 |
* early Mac systems behaved.
|
|
|
1324 |
*
|
|
|
1325 |
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
|
|
|
1326 |
* This is the classic Jim Blinn approach and will work in academic
|
|
|
1327 |
* environments where everything is done by the book. It has the shortcoming
|
|
|
1328 |
* of assuming that input PNG data with no gamma information is linear - this
|
|
|
1329 |
* is unlikely to be correct unless the PNG files where generated locally.
|
|
|
1330 |
* Most of the time the output precision will be so low as to show
|
|
|
1331 |
* significant banding in dark areas of the image.
|
|
|
1332 |
*
|
|
|
1333 |
* png_set_expand_16(pp);
|
|
|
1334 |
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
|
|
|
1335 |
* This is a somewhat more realistic Jim Blinn inspired approach. PNG files
|
|
|
1336 |
* are assumed to have the sRGB encoding if not marked with a gamma value and
|
|
|
1337 |
* the output is always 16 bits per component. This permits accurate scaling
|
|
|
1338 |
* and processing of the data. If you know that your input PNG files were
|
|
|
1339 |
* generated locally you might need to replace PNG_DEFAULT_sRGB with the
|
|
|
1340 |
* correct value for your system.
|
|
|
1341 |
*
|
|
|
1342 |
* png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
|
|
|
1343 |
* If you just need to composite the PNG image onto an existing background
|
|
|
1344 |
* and if you control the code that does this you can use the optimization
|
|
|
1345 |
* setting. In this case you just copy completely opaque pixels to the
|
|
|
1346 |
* output. For pixels that are not completely transparent (you just skip
|
|
|
1347 |
* those) you do the composition math using png_composite or png_composite_16
|
|
|
1348 |
* below then encode the resultant 8-bit or 16-bit values to match the output
|
|
|
1349 |
* encoding.
|
|
|
1350 |
*
|
|
|
1351 |
* Other cases
|
|
|
1352 |
* If neither the PNG nor the standard linear encoding work for you because
|
|
|
1353 |
* of the software or hardware you use then you have a big problem. The PNG
|
|
|
1354 |
* case will probably result in halos around the image. The linear encoding
|
|
|
1355 |
* will probably result in a washed out, too bright, image (it's actually too
|
|
|
1356 |
* contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably
|
|
|
1357 |
* substantially reduce the halos. Alternatively try:
|
|
|
1358 |
*
|
|
|
1359 |
* png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
|
|
|
1360 |
* This option will also reduce the halos, but there will be slight dark
|
|
|
1361 |
* halos round the opaque parts of the image where the background is light.
|
|
|
1362 |
* In the OPTIMIZED mode the halos will be light halos where the background
|
|
|
1363 |
* is dark. Take your pick - the halos are unavoidable unless you can get
|
|
|
1364 |
* your hardware/software fixed! (The OPTIMIZED approach is slightly
|
|
|
1365 |
* faster.)
|
|
|
1366 |
*
|
|
|
1367 |
* When the default gamma of PNG files doesn't match the output gamma.
|
|
|
1368 |
* If you have PNG files with no gamma information png_set_alpha_mode allows
|
|
|
1369 |
* you to provide a default gamma, but it also sets the ouput gamma to the
|
|
|
1370 |
* matching value. If you know your PNG files have a gamma that doesn't
|
|
|
1371 |
* match the output you can take advantage of the fact that
|
|
|
1372 |
* png_set_alpha_mode always sets the output gamma but only sets the PNG
|
|
|
1373 |
* default if it is not already set:
|
|
|
1374 |
*
|
|
|
1375 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
|
|
|
1376 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
|
|
|
1377 |
* The first call sets both the default and the output gamma values, the
|
|
|
1378 |
* second call overrides the output gamma without changing the default. This
|
|
|
1379 |
* is easier than achieving the same effect with png_set_gamma. You must use
|
|
|
1380 |
* PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
|
|
|
1381 |
* fire if more than one call to png_set_alpha_mode and png_set_background is
|
|
|
1382 |
* made in the same read operation, however multiple calls with PNG_ALPHA_PNG
|
|
|
1383 |
* are ignored.
|
|
|
1384 |
*/
|
|
|
1385 |
|
|
|
1386 |
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
|
|
|
1387 |
PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr));
|
|
|
1388 |
#endif
|
|
|
1389 |
|
|
|
1390 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
|
|
|
1391 |
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
|
1392 |
PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr));
|
|
|
1393 |
#endif
|
|
|
1394 |
|
|
|
1395 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
|
|
|
1396 |
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|
|
1397 |
PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr));
|
|
|
1398 |
#endif
|
|
|
1399 |
|
|
|
1400 |
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
|
1401 |
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
|
|
|
1402 |
PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler,
|
|
|
1403 |
int flags));
|
|
|
1404 |
/* The values of the PNG_FILLER_ defines should NOT be changed */
|
|
|
1405 |
# define PNG_FILLER_BEFORE 0
|
|
|
1406 |
# define PNG_FILLER_AFTER 1
|
|
|
1407 |
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
|
|
|
1408 |
PNG_EXPORT(40, void, png_set_add_alpha,
|
|
|
1409 |
(png_structp png_ptr, png_uint_32 filler,
|
|
|
1410 |
int flags));
|
|
|
1411 |
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|
|
1412 |
|
|
|
1413 |
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
|
1414 |
/* Swap bytes in 16-bit depth files. */
|
|
|
1415 |
PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr));
|
|
|
1416 |
#endif
|
|
|
1417 |
|
|
|
1418 |
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|
|
1419 |
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
|
|
|
1420 |
PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr));
|
|
|
1421 |
#endif
|
|
|
1422 |
|
|
|
1423 |
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
|
|
|
1424 |
defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
|
1425 |
/* Swap packing order of pixels in bytes. */
|
|
|
1426 |
PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr));
|
|
|
1427 |
#endif
|
|
|
1428 |
|
|
|
1429 |
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
|
1430 |
/* Converts files to legal bit depths. */
|
|
|
1431 |
PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p
|
|
|
1432 |
true_bits));
|
|
|
1433 |
#endif
|
|
|
1434 |
|
|
|
1435 |
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
|
|
|
1436 |
defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
|
1437 |
/* Have the code handle the interlacing. Returns the number of passes.
|
|
|
1438 |
* MUST be called before png_read_update_info or png_start_read_image,
|
|
|
1439 |
* otherwise it will not have the desired effect. Note that it is still
|
|
|
1440 |
* necessary to call png_read_row or png_read_rows png_get_image_height
|
|
|
1441 |
* times for each pass.
|
|
|
1442 |
*/
|
|
|
1443 |
PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr));
|
|
|
1444 |
#endif
|
|
|
1445 |
|
|
|
1446 |
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
|
1447 |
/* Invert monochrome files */
|
|
|
1448 |
PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr));
|
|
|
1449 |
#endif
|
|
|
1450 |
|
|
|
1451 |
#ifdef PNG_READ_BACKGROUND_SUPPORTED
|
|
|
1452 |
/* Handle alpha and tRNS by replacing with a background color. Prior to
|
|
|
1453 |
* libpng-1.5.4 this API must not be called before the PNG file header has been
|
|
|
1454 |
* read. Doing so will result in unexpected behavior and possible warnings or
|
|
|
1455 |
* errors if the PNG file contains a bKGD chunk.
|
|
|
1456 |
*/
|
|
|
1457 |
PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr,
|
|
|
1458 |
png_const_color_16p background_color, int background_gamma_code,
|
|
|
1459 |
int need_expand, double background_gamma))
|
|
|
1460 |
PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr,
|
|
|
1461 |
png_const_color_16p background_color, int background_gamma_code,
|
|
|
1462 |
int need_expand, png_fixed_point background_gamma))
|
|
|
1463 |
#endif
|
|
|
1464 |
#ifdef PNG_READ_BACKGROUND_SUPPORTED
|
|
|
1465 |
# define PNG_BACKGROUND_GAMMA_UNKNOWN 0
|
|
|
1466 |
# define PNG_BACKGROUND_GAMMA_SCREEN 1
|
|
|
1467 |
# define PNG_BACKGROUND_GAMMA_FILE 2
|
|
|
1468 |
# define PNG_BACKGROUND_GAMMA_UNIQUE 3
|
|
|
1469 |
#endif
|
|
|
1470 |
|
|
|
1471 |
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
|
|
|
1472 |
/* Scale a 16-bit depth file down to 8-bit, accurately. */
|
|
|
1473 |
PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr));
|
|
|
1474 |
#endif
|
|
|
1475 |
|
|
|
1476 |
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
|
|
|
1477 |
#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
|
|
|
1478 |
/* Strip the second byte of information from a 16-bit depth file. */
|
|
|
1479 |
PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr));
|
|
|
1480 |
#endif
|
|
|
1481 |
|
|
|
1482 |
#ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|
|
1483 |
/* Turn on quantizing, and reduce the palette to the number of colors
|
|
|
1484 |
* available.
|
|
|
1485 |
*/
|
|
|
1486 |
PNG_EXPORT(49, void, png_set_quantize,
|
|
|
1487 |
(png_structp png_ptr, png_colorp palette,
|
|
|
1488 |
int num_palette, int maximum_colors, png_const_uint_16p histogram,
|
|
|
1489 |
int full_quantize));
|
|
|
1490 |
#endif
|
|
|
1491 |
|
|
|
1492 |
#ifdef PNG_READ_GAMMA_SUPPORTED
|
|
|
1493 |
/* The threshold on gamma processing is configurable but hard-wired into the
|
|
|
1494 |
* library. The following is the floating point variant.
|
|
|
1495 |
*/
|
|
|
1496 |
#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
|
|
|
1497 |
|
|
|
1498 |
/* Handle gamma correction. Screen_gamma=(display_exponent).
|
|
|
1499 |
* NOTE: this API simply sets the screen and file gamma values. It will
|
|
|
1500 |
* therefore override the value for gamma in a PNG file if it is called after
|
|
|
1501 |
* the file header has been read - use with care - call before reading the PNG
|
|
|
1502 |
* file for best results!
|
|
|
1503 |
*
|
|
|
1504 |
* These routines accept the same gamma values as png_set_alpha_mode (described
|
|
|
1505 |
* above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
|
|
|
1506 |
* API (floating point or fixed.) Notice, however, that the 'file_gamma' value
|
|
|
1507 |
* is the inverse of a 'screen gamma' value.
|
|
|
1508 |
*/
|
|
|
1509 |
PNG_FP_EXPORT(50, void, png_set_gamma,
|
|
|
1510 |
(png_structp png_ptr, double screen_gamma,
|
|
|
1511 |
double override_file_gamma))
|
|
|
1512 |
PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr,
|
|
|
1513 |
png_fixed_point screen_gamma, png_fixed_point override_file_gamma))
|
|
|
1514 |
#endif
|
|
|
1515 |
|
|
|
1516 |
#ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|
|
1517 |
/* Set how many lines between output flushes - 0 for no flushing */
|
|
|
1518 |
PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows));
|
|
|
1519 |
/* Flush the current PNG output buffer */
|
|
|
1520 |
PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr));
|
|
|
1521 |
#endif
|
|
|
1522 |
|
|
|
1523 |
/* Optional update palette with requested transformations */
|
|
|
1524 |
PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr));
|
|
|
1525 |
|
|
|
1526 |
/* Optional call to update the users info structure */
|
|
|
1527 |
PNG_EXPORT(54, void, png_read_update_info,
|
|
|
1528 |
(png_structp png_ptr, png_infop info_ptr));
|
|
|
1529 |
|
|
|
1530 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1531 |
/* Read one or more rows of image data. */
|
|
|
1532 |
PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row,
|
|
|
1533 |
png_bytepp display_row, png_uint_32 num_rows));
|
|
|
1534 |
#endif
|
|
|
1535 |
|
|
|
1536 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1537 |
/* Read a row of data. */
|
|
|
1538 |
PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row,
|
|
|
1539 |
png_bytep display_row));
|
|
|
1540 |
#endif
|
|
|
1541 |
|
|
|
1542 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1543 |
/* Read the whole image into memory at once. */
|
|
|
1544 |
PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image));
|
|
|
1545 |
#endif
|
|
|
1546 |
|
|
|
1547 |
/* Write a row of image data */
|
|
|
1548 |
PNG_EXPORT(58, void, png_write_row,
|
|
|
1549 |
(png_structp png_ptr, png_const_bytep row));
|
|
|
1550 |
|
|
|
1551 |
/* Write a few rows of image data: (*row) is not written; however, the type
|
|
|
1552 |
* is declared as writeable to maintain compatibility with previous versions
|
|
|
1553 |
* of libpng and to allow the 'display_row' array from read_rows to be passed
|
|
|
1554 |
* unchanged to write_rows.
|
|
|
1555 |
*/
|
|
|
1556 |
PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row,
|
|
|
1557 |
png_uint_32 num_rows));
|
|
|
1558 |
|
|
|
1559 |
/* Write the image data */
|
|
|
1560 |
PNG_EXPORT(60, void, png_write_image,
|
|
|
1561 |
(png_structp png_ptr, png_bytepp image));
|
|
|
1562 |
|
|
|
1563 |
/* Write the end of the PNG file. */
|
|
|
1564 |
PNG_EXPORT(61, void, png_write_end,
|
|
|
1565 |
(png_structp png_ptr, png_infop info_ptr));
|
|
|
1566 |
|
|
|
1567 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|
|
1568 |
/* Read the end of the PNG file. */
|
|
|
1569 |
PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr));
|
|
|
1570 |
#endif
|
|
|
1571 |
|
|
|
1572 |
/* Free any memory associated with the png_info_struct */
|
|
|
1573 |
PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr,
|
|
|
1574 |
png_infopp info_ptr_ptr));
|
|
|
1575 |
|
|
|
1576 |
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
|
1577 |
PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
|
|
|
1578 |
png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
|
|
|
1579 |
|
|
|
1580 |
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
|
1581 |
PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
|
|
|
1582 |
png_infopp info_ptr_ptr));
|
|
|
1583 |
|
|
|
1584 |
/* Set the libpng method of handling chunk CRC errors */
|
|
|
1585 |
PNG_EXPORT(66, void, png_set_crc_action,
|
|
|
1586 |
(png_structp png_ptr, int crit_action, int ancil_action));
|
|
|
1587 |
|
|
|
1588 |
/* Values for png_set_crc_action() say how to handle CRC errors in
|
|
|
1589 |
* ancillary and critical chunks, and whether to use the data contained
|
|
|
1590 |
* therein. Note that it is impossible to "discard" data in a critical
|
|
|
1591 |
* chunk. For versions prior to 0.90, the action was always error/quit,
|
|
|
1592 |
* whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|
|
1593 |
* chunks is warn/discard. These values should NOT be changed.
|
|
|
1594 |
*
|
|
|
1595 |
* value action:critical action:ancillary
|
|
|
1596 |
*/
|
|
|
1597 |
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
|
|
|
1598 |
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
|
|
|
1599 |
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
|
|
|
1600 |
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
|
|
|
1601 |
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
|
|
|
1602 |
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
|
|
|
1603 |
|
|
|
1604 |
/* These functions give the user control over the scan-line filtering in
|
|
|
1605 |
* libpng and the compression methods used by zlib. These functions are
|
|
|
1606 |
* mainly useful for testing, as the defaults should work with most users.
|
|
|
1607 |
* Those users who are tight on memory or want faster performance at the
|
|
|
1608 |
* expense of compression can modify them. See the compression library
|
|
|
1609 |
* header file (zlib.h) for an explination of the compression functions.
|
|
|
1610 |
*/
|
|
|
1611 |
|
|
|
1612 |
/* Set the filtering method(s) used by libpng. Currently, the only valid
|
|
|
1613 |
* value for "method" is 0.
|
|
|
1614 |
*/
|
|
|
1615 |
PNG_EXPORT(67, void, png_set_filter,
|
|
|
1616 |
(png_structp png_ptr, int method, int filters));
|
|
|
1617 |
|
|
|
1618 |
/* Flags for png_set_filter() to say which filters to use. The flags
|
|
|
1619 |
* are chosen so that they don't conflict with real filter types
|
|
|
1620 |
* below, in case they are supplied instead of the #defined constants.
|
|
|
1621 |
* These values should NOT be changed.
|
|
|
1622 |
*/
|
|
|
1623 |
#define PNG_NO_FILTERS 0x00
|
|
|
1624 |
#define PNG_FILTER_NONE 0x08
|
|
|
1625 |
#define PNG_FILTER_SUB 0x10
|
|
|
1626 |
#define PNG_FILTER_UP 0x20
|
|
|
1627 |
#define PNG_FILTER_AVG 0x40
|
|
|
1628 |
#define PNG_FILTER_PAETH 0x80
|
|
|
1629 |
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
|
|
|
1630 |
PNG_FILTER_AVG | PNG_FILTER_PAETH)
|
|
|
1631 |
|
|
|
1632 |
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|
|
1633 |
* These defines should NOT be changed.
|
|
|
1634 |
*/
|
|
|
1635 |
#define PNG_FILTER_VALUE_NONE 0
|
|
|
1636 |
#define PNG_FILTER_VALUE_SUB 1
|
|
|
1637 |
#define PNG_FILTER_VALUE_UP 2
|
|
|
1638 |
#define PNG_FILTER_VALUE_AVG 3
|
|
|
1639 |
#define PNG_FILTER_VALUE_PAETH 4
|
|
|
1640 |
#define PNG_FILTER_VALUE_LAST 5
|
|
|
1641 |
|
|
|
1642 |
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
|
|
|
1643 |
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|
|
1644 |
* defines, either the default (minimum-sum-of-absolute-differences), or
|
|
|
1645 |
* the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|
|
1646 |
*
|
|
|
1647 |
* Weights are factors >= 1.0, indicating how important it is to keep the
|
|
|
1648 |
* filter type consistent between rows. Larger numbers mean the current
|
|
|
1649 |
* filter is that many times as likely to be the same as the "num_weights"
|
|
|
1650 |
* previous filters. This is cumulative for each previous row with a weight.
|
|
|
1651 |
* There needs to be "num_weights" values in "filter_weights", or it can be
|
|
|
1652 |
* NULL if the weights aren't being specified. Weights have no influence on
|
|
|
1653 |
* the selection of the first row filter. Well chosen weights can (in theory)
|
|
|
1654 |
* improve the compression for a given image.
|
|
|
1655 |
*
|
|
|
1656 |
* Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|
|
1657 |
* filter type. Higher costs indicate more decoding expense, and are
|
|
|
1658 |
* therefore less likely to be selected over a filter with lower computational
|
|
|
1659 |
* costs. There needs to be a value in "filter_costs" for each valid filter
|
|
|
1660 |
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|
|
1661 |
* setting the costs. Costs try to improve the speed of decompression without
|
|
|
1662 |
* unduly increasing the compressed image size.
|
|
|
1663 |
*
|
|
|
1664 |
* A negative weight or cost indicates the default value is to be used, and
|
|
|
1665 |
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|
|
1666 |
* The default values for both weights and costs are currently 1.0, but may
|
|
|
1667 |
* change if good general weighting/cost heuristics can be found. If both
|
|
|
1668 |
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|
|
1669 |
* to the UNWEIGHTED method, but with added encoding time/computation.
|
|
|
1670 |
*/
|
|
|
1671 |
PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr,
|
|
|
1672 |
int heuristic_method, int num_weights, png_const_doublep filter_weights,
|
|
|
1673 |
png_const_doublep filter_costs))
|
|
|
1674 |
PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
|
|
|
1675 |
(png_structp png_ptr,
|
|
|
1676 |
int heuristic_method, int num_weights, png_const_fixed_point_p
|
|
|
1677 |
filter_weights, png_const_fixed_point_p filter_costs))
|
|
|
1678 |
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
|
1679 |
|
|
|
1680 |
/* Heuristic used for row filter selection. These defines should NOT be
|
|
|
1681 |
* changed.
|
|
|
1682 |
*/
|
|
|
1683 |
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
|
|
|
1684 |
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
|
|
|
1685 |
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
|
|
|
1686 |
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
|
|
|
1687 |
|
|
|
1688 |
#ifdef PNG_WRITE_SUPPORTED
|
|
|
1689 |
/* Set the library compression level. Currently, valid values range from
|
|
|
1690 |
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|
|
1691 |
* (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|
|
1692 |
* shown that zlib compression levels 3-6 usually perform as well as level 9
|
|
|
1693 |
* for PNG images, and do considerably fewer caclulations. In the future,
|
|
|
1694 |
* these values may not correspond directly to the zlib compression levels.
|
|
|
1695 |
*/
|
|
|
1696 |
PNG_EXPORT(69, void, png_set_compression_level,
|
|
|
1697 |
(png_structp png_ptr, int level));
|
|
|
1698 |
|
|
|
1699 |
PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr,
|
|
|
1700 |
int mem_level));
|
|
|
1701 |
|
|
|
1702 |
PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr,
|
|
|
1703 |
int strategy));
|
|
|
1704 |
|
|
|
1705 |
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
|
1706 |
* smaller value of window_bits if it can do so safely.
|
|
|
1707 |
*/
|
|
|
1708 |
PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr,
|
|
|
1709 |
int window_bits));
|
|
|
1710 |
|
|
|
1711 |
PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
|
|
|
1712 |
int method));
|
|
|
1713 |
#endif
|
|
|
1714 |
|
|
|
1715 |
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
|
|
|
1716 |
/* Also set zlib parameters for compressing non-IDAT chunks */
|
|
|
1717 |
PNG_EXPORT(222, void, png_set_text_compression_level,
|
|
|
1718 |
(png_structp png_ptr, int level));
|
|
|
1719 |
|
|
|
1720 |
PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr,
|
|
|
1721 |
int mem_level));
|
|
|
1722 |
|
|
|
1723 |
PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr,
|
|
|
1724 |
int strategy));
|
|
|
1725 |
|
|
|
1726 |
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
|
1727 |
* smaller value of window_bits if it can do so safely.
|
|
|
1728 |
*/
|
|
|
1729 |
PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
|
|
|
1730 |
png_ptr, int window_bits));
|
|
|
1731 |
|
|
|
1732 |
PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
|
|
|
1733 |
int method));
|
|
|
1734 |
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
|
|
|
1735 |
|
|
|
1736 |
/* These next functions are called for input/output, memory, and error
|
|
|
1737 |
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|
|
1738 |
* and call standard C I/O routines such as fread(), fwrite(), and
|
|
|
1739 |
* fprintf(). These functions can be made to use other I/O routines
|
|
|
1740 |
* at run time for those applications that need to handle I/O in a
|
|
|
1741 |
* different manner by calling png_set_???_fn(). See libpng-manual.txt for
|
|
|
1742 |
* more information.
|
|
|
1743 |
*/
|
|
|
1744 |
|
|
|
1745 |
#ifdef PNG_STDIO_SUPPORTED
|
|
|
1746 |
/* Initialize the input/output for the PNG file to the default functions. */
|
|
|
1747 |
PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp));
|
|
|
1748 |
#endif
|
|
|
1749 |
|
|
|
1750 |
/* Replace the (error and abort), and warning functions with user
|
|
|
1751 |
* supplied functions. If no messages are to be printed you must still
|
|
|
1752 |
* write and use replacement functions. The replacement error_fn should
|
|
|
1753 |
* still do a longjmp to the last setjmp location if you are using this
|
|
|
1754 |
* method of error handling. If error_fn or warning_fn is NULL, the
|
|
|
1755 |
* default function will be used.
|
|
|
1756 |
*/
|
|
|
1757 |
|
|
|
1758 |
PNG_EXPORT(75, void, png_set_error_fn,
|
|
|
1759 |
(png_structp png_ptr, png_voidp error_ptr,
|
|
|
1760 |
png_error_ptr error_fn, png_error_ptr warning_fn));
|
|
|
1761 |
|
|
|
1762 |
/* Return the user pointer associated with the error functions */
|
|
|
1763 |
PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr));
|
|
|
1764 |
|
|
|
1765 |
/* Replace the default data output functions with a user supplied one(s).
|
|
|
1766 |
* If buffered output is not used, then output_flush_fn can be set to NULL.
|
|
|
1767 |
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|
|
1768 |
* output_flush_fn will be ignored (and thus can be NULL).
|
|
|
1769 |
* It is probably a mistake to use NULL for output_flush_fn if
|
|
|
1770 |
* write_data_fn is not also NULL unless you have built libpng with
|
|
|
1771 |
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
|
|
|
1772 |
* default flush function, which uses the standard *FILE structure, will
|
|
|
1773 |
* be used.
|
|
|
1774 |
*/
|
|
|
1775 |
PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr,
|
|
|
1776 |
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
|
|
|
1777 |
|
|
|
1778 |
/* Replace the default data input function with a user supplied one. */
|
|
|
1779 |
PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr,
|
|
|
1780 |
png_rw_ptr read_data_fn));
|
|
|
1781 |
|
|
|
1782 |
/* Return the user pointer associated with the I/O functions */
|
|
|
1783 |
PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr));
|
|
|
1784 |
|
|
|
1785 |
PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr,
|
|
|
1786 |
png_read_status_ptr read_row_fn));
|
|
|
1787 |
|
|
|
1788 |
PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr,
|
|
|
1789 |
png_write_status_ptr write_row_fn));
|
|
|
1790 |
|
|
|
1791 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
1792 |
/* Replace the default memory allocation functions with user supplied one(s). */
|
|
|
1793 |
PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr,
|
|
|
1794 |
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
|
1795 |
/* Return the user pointer associated with the memory functions */
|
|
|
1796 |
PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr));
|
|
|
1797 |
#endif
|
|
|
1798 |
|
|
|
1799 |
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|
|
1800 |
PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr,
|
|
|
1801 |
png_user_transform_ptr read_user_transform_fn));
|
|
|
1802 |
#endif
|
|
|
1803 |
|
|
|
1804 |
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
|
|
|
1805 |
PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr,
|
|
|
1806 |
png_user_transform_ptr write_user_transform_fn));
|
|
|
1807 |
#endif
|
|
|
1808 |
|
|
|
1809 |
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
|
|
|
1810 |
PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr,
|
|
|
1811 |
png_voidp user_transform_ptr, int user_transform_depth,
|
|
|
1812 |
int user_transform_channels));
|
|
|
1813 |
/* Return the user pointer associated with the user transform functions */
|
|
|
1814 |
PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,
|
|
|
1815 |
(png_const_structp png_ptr));
|
|
|
1816 |
#endif
|
|
|
1817 |
|
|
|
1818 |
#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
|
|
|
1819 |
/* Return information about the row currently being processed. Note that these
|
|
|
1820 |
* APIs do not fail but will return unexpected results if called outside a user
|
|
|
1821 |
* transform callback. Also note that when transforming an interlaced image the
|
|
|
1822 |
* row number is the row number within the sub-image of the interlace pass, so
|
|
|
1823 |
* the value will increase to the height of the sub-image (not the full image)
|
|
|
1824 |
* then reset to 0 for the next pass.
|
|
|
1825 |
*
|
|
|
1826 |
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
|
|
|
1827 |
* find the output pixel (x,y) given an interlaced sub-image pixel
|
|
|
1828 |
* (row,col,pass). (See below for these macros.)
|
|
|
1829 |
*/
|
|
|
1830 |
PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp));
|
|
|
1831 |
PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp));
|
|
|
1832 |
#endif
|
|
|
1833 |
|
|
|
1834 |
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
|
1835 |
PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr,
|
|
|
1836 |
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
|
|
|
1837 |
PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr));
|
|
|
1838 |
#endif
|
|
|
1839 |
|
|
|
1840 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
1841 |
/* Sets the function callbacks for the push reader, and a pointer to a
|
|
|
1842 |
* user-defined structure available to the callback functions.
|
|
|
1843 |
*/
|
|
|
1844 |
PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr,
|
|
|
1845 |
png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
|
|
|
1846 |
png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
|
|
|
1847 |
|
|
|
1848 |
/* Returns the user pointer associated with the push read functions */
|
|
|
1849 |
PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr));
|
|
|
1850 |
|
|
|
1851 |
/* Function to be called when data becomes available */
|
|
|
1852 |
PNG_EXPORT(92, void, png_process_data,
|
|
|
1853 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
1854 |
png_bytep buffer, png_size_t buffer_size));
|
|
|
1855 |
|
|
|
1856 |
/* A function which may be called *only* within png_process_data to stop the
|
|
|
1857 |
* processing of any more data. The function returns the number of bytes
|
|
|
1858 |
* remaining, excluding any that libpng has cached internally. A subsequent
|
|
|
1859 |
* call to png_process_data must supply these bytes again. If the argument
|
|
|
1860 |
* 'save' is set to true the routine will first save all the pending data and
|
|
|
1861 |
* will always return 0.
|
|
|
1862 |
*/
|
|
|
1863 |
PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save));
|
|
|
1864 |
|
|
|
1865 |
/* A function which may be called *only* outside (after) a call to
|
|
|
1866 |
* png_process_data. It returns the number of bytes of data to skip in the
|
|
|
1867 |
* input. Normally it will return 0, but if it returns a non-zero value the
|
|
|
1868 |
* application must skip than number of bytes of input data and pass the
|
|
|
1869 |
* following data to the next call to png_process_data.
|
|
|
1870 |
*/
|
|
|
1871 |
PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp));
|
|
|
1872 |
|
|
|
1873 |
#ifdef PNG_READ_INTERLACING_SUPPORTED
|
|
|
1874 |
/* Function that combines rows. 'new_row' is a flag that should come from
|
|
|
1875 |
* the callback and be non-NULL if anything needs to be done; the library
|
|
|
1876 |
* stores its own version of the new data internally and ignores the passed
|
|
|
1877 |
* in value.
|
|
|
1878 |
*/
|
|
|
1879 |
PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr,
|
|
|
1880 |
png_bytep old_row, png_const_bytep new_row));
|
|
|
1881 |
#endif /* PNG_READ_INTERLACING_SUPPORTED */
|
|
|
1882 |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
1883 |
|
|
|
1884 |
PNG_EXPORTA(94, png_voidp, png_malloc,
|
|
|
1885 |
(png_structp png_ptr, png_alloc_size_t size),
|
|
|
1886 |
PNG_ALLOCATED);
|
|
|
1887 |
/* Added at libpng version 1.4.0 */
|
|
|
1888 |
PNG_EXPORTA(95, png_voidp, png_calloc,
|
|
|
1889 |
(png_structp png_ptr, png_alloc_size_t size),
|
|
|
1890 |
PNG_ALLOCATED);
|
|
|
1891 |
|
|
|
1892 |
/* Added at libpng version 1.2.4 */
|
|
|
1893 |
PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr,
|
|
|
1894 |
png_alloc_size_t size), PNG_ALLOCATED);
|
|
|
1895 |
|
|
|
1896 |
/* Frees a pointer allocated by png_malloc() */
|
|
|
1897 |
PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr));
|
|
|
1898 |
|
|
|
1899 |
/* Free data that was allocated internally */
|
|
|
1900 |
PNG_EXPORT(98, void, png_free_data,
|
|
|
1901 |
(png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num));
|
|
|
1902 |
|
|
|
1903 |
/* Reassign responsibility for freeing existing data, whether allocated
|
|
|
1904 |
* by libpng or by the application */
|
|
|
1905 |
PNG_EXPORT(99, void, png_data_freer,
|
|
|
1906 |
(png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask));
|
|
|
1907 |
|
|
|
1908 |
/* Assignments for png_data_freer */
|
|
|
1909 |
#define PNG_DESTROY_WILL_FREE_DATA 1
|
|
|
1910 |
#define PNG_SET_WILL_FREE_DATA 1
|
|
|
1911 |
#define PNG_USER_WILL_FREE_DATA 2
|
|
|
1912 |
/* Flags for png_ptr->free_me and info_ptr->free_me */
|
|
|
1913 |
#define PNG_FREE_HIST 0x0008
|
|
|
1914 |
#define PNG_FREE_ICCP 0x0010
|
|
|
1915 |
#define PNG_FREE_SPLT 0x0020
|
|
|
1916 |
#define PNG_FREE_ROWS 0x0040
|
|
|
1917 |
#define PNG_FREE_PCAL 0x0080
|
|
|
1918 |
#define PNG_FREE_SCAL 0x0100
|
|
|
1919 |
#define PNG_FREE_UNKN 0x0200
|
|
|
1920 |
#define PNG_FREE_LIST 0x0400
|
|
|
1921 |
#define PNG_FREE_PLTE 0x1000
|
|
|
1922 |
#define PNG_FREE_TRNS 0x2000
|
|
|
1923 |
#define PNG_FREE_TEXT 0x4000
|
|
|
1924 |
#define PNG_FREE_ALL 0x7fff
|
|
|
1925 |
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
|
|
|
1926 |
|
|
|
1927 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
1928 |
PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr,
|
|
|
1929 |
png_alloc_size_t size), PNG_ALLOCATED);
|
|
|
1930 |
PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr));
|
|
|
1931 |
#endif
|
|
|
1932 |
|
|
|
1933 |
#ifdef PNG_ERROR_TEXT_SUPPORTED
|
|
|
1934 |
/* Fatal error in PNG image of libpng - can't continue */
|
|
|
1935 |
PNG_EXPORTA(102, void, png_error,
|
|
|
1936 |
(png_structp png_ptr, png_const_charp error_message),
|
|
|
1937 |
PNG_NORETURN);
|
|
|
1938 |
|
|
|
1939 |
/* The same, but the chunk name is prepended to the error string. */
|
|
|
1940 |
PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr,
|
|
|
1941 |
png_const_charp error_message), PNG_NORETURN);
|
|
|
1942 |
|
|
|
1943 |
#else
|
|
|
1944 |
/* Fatal error in PNG image of libpng - can't continue */
|
|
|
1945 |
PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN);
|
|
|
1946 |
#endif
|
|
|
1947 |
|
|
|
1948 |
#ifdef PNG_WARNINGS_SUPPORTED
|
|
|
1949 |
/* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|
|
1950 |
PNG_EXPORT(105, void, png_warning, (png_structp png_ptr,
|
|
|
1951 |
png_const_charp warning_message));
|
|
|
1952 |
|
|
|
1953 |
/* Non-fatal error in libpng, chunk name is prepended to message. */
|
|
|
1954 |
PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr,
|
|
|
1955 |
png_const_charp warning_message));
|
|
|
1956 |
#endif
|
|
|
1957 |
|
|
|
1958 |
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
|
|
|
1959 |
/* Benign error in libpng. Can continue, but may have a problem.
|
|
|
1960 |
* User can choose whether to handle as a fatal error or as a warning. */
|
|
|
1961 |
# undef png_benign_error
|
|
|
1962 |
PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr,
|
|
|
1963 |
png_const_charp warning_message));
|
|
|
1964 |
|
|
|
1965 |
/* Same, chunk name is prepended to message. */
|
|
|
1966 |
# undef png_chunk_benign_error
|
|
|
1967 |
PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr,
|
|
|
1968 |
png_const_charp warning_message));
|
|
|
1969 |
|
|
|
1970 |
PNG_EXPORT(109, void, png_set_benign_errors,
|
|
|
1971 |
(png_structp png_ptr, int allowed));
|
|
|
1972 |
#else
|
|
|
1973 |
# ifdef PNG_ALLOW_BENIGN_ERRORS
|
|
|
1974 |
# define png_benign_error png_warning
|
|
|
1975 |
# define png_chunk_benign_error png_chunk_warning
|
|
|
1976 |
# else
|
|
|
1977 |
# define png_benign_error png_error
|
|
|
1978 |
# define png_chunk_benign_error png_chunk_error
|
|
|
1979 |
# endif
|
|
|
1980 |
#endif
|
|
|
1981 |
|
|
|
1982 |
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|
|
1983 |
* Similarly, the png_get_<chunk> calls are used to read values from the
|
|
|
1984 |
* png_info_struct, either storing the parameters in the passed variables, or
|
|
|
1985 |
* setting pointers into the png_info_struct where the data is stored. The
|
|
|
1986 |
* png_get_<chunk> functions return a non-zero value if the data was available
|
|
|
1987 |
* in info_ptr, or return zero and do not change any of the parameters if the
|
|
|
1988 |
* data was not available.
|
|
|
1989 |
*
|
|
|
1990 |
* These functions should be used instead of directly accessing png_info
|
|
|
1991 |
* to avoid problems with future changes in the size and internal layout of
|
|
|
1992 |
* png_info_struct.
|
|
|
1993 |
*/
|
|
|
1994 |
/* Returns "flag" if chunk data is valid in info_ptr. */
|
|
|
1995 |
PNG_EXPORT(110, png_uint_32, png_get_valid,
|
|
|
1996 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
1997 |
png_uint_32 flag));
|
|
|
1998 |
|
|
|
1999 |
/* Returns number of bytes needed to hold a transformed row. */
|
|
|
2000 |
PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr,
|
|
|
2001 |
png_const_infop info_ptr));
|
|
|
2002 |
|
|
|
2003 |
#ifdef PNG_INFO_IMAGE_SUPPORTED
|
|
|
2004 |
/* Returns row_pointers, which is an array of pointers to scanlines that was
|
|
|
2005 |
* returned from png_read_png().
|
|
|
2006 |
*/
|
|
|
2007 |
PNG_EXPORT(112, png_bytepp, png_get_rows,
|
|
|
2008 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2009 |
/* Set row_pointers, which is an array of pointers to scanlines for use
|
|
|
2010 |
* by png_write_png().
|
|
|
2011 |
*/
|
|
|
2012 |
PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr,
|
|
|
2013 |
png_infop info_ptr, png_bytepp row_pointers));
|
|
|
2014 |
#endif
|
|
|
2015 |
|
|
|
2016 |
/* Returns number of color channels in image. */
|
|
|
2017 |
PNG_EXPORT(114, png_byte, png_get_channels,
|
|
|
2018 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2019 |
|
|
|
2020 |
#ifdef PNG_EASY_ACCESS_SUPPORTED
|
|
|
2021 |
/* Returns image width in pixels. */
|
|
|
2022 |
PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr,
|
|
|
2023 |
png_const_infop info_ptr));
|
|
|
2024 |
|
|
|
2025 |
/* Returns image height in pixels. */
|
|
|
2026 |
PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr,
|
|
|
2027 |
png_const_infop info_ptr));
|
|
|
2028 |
|
|
|
2029 |
/* Returns image bit_depth. */
|
|
|
2030 |
PNG_EXPORT(117, png_byte, png_get_bit_depth,
|
|
|
2031 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2032 |
|
|
|
2033 |
/* Returns image color_type. */
|
|
|
2034 |
PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr,
|
|
|
2035 |
png_const_infop info_ptr));
|
|
|
2036 |
|
|
|
2037 |
/* Returns image filter_type. */
|
|
|
2038 |
PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr,
|
|
|
2039 |
png_const_infop info_ptr));
|
|
|
2040 |
|
|
|
2041 |
/* Returns image interlace_type. */
|
|
|
2042 |
PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr,
|
|
|
2043 |
png_const_infop info_ptr));
|
|
|
2044 |
|
|
|
2045 |
/* Returns image compression_type. */
|
|
|
2046 |
PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr,
|
|
|
2047 |
png_const_infop info_ptr));
|
|
|
2048 |
|
|
|
2049 |
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
|
|
|
2050 |
PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,
|
|
|
2051 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2052 |
PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,
|
|
|
2053 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2054 |
PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,
|
|
|
2055 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2056 |
|
|
|
2057 |
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
|
|
|
2058 |
PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,
|
|
|
2059 |
(png_const_structp png_ptr, png_const_infop info_ptr))
|
|
|
2060 |
PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed,
|
|
|
2061 |
(png_const_structp png_ptr, png_const_infop info_ptr))
|
|
|
2062 |
|
|
|
2063 |
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
|
|
|
2064 |
PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,
|
|
|
2065 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2066 |
PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,
|
|
|
2067 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2068 |
PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,
|
|
|
2069 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2070 |
PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,
|
|
|
2071 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2072 |
|
|
|
2073 |
#endif /* PNG_EASY_ACCESS_SUPPORTED */
|
|
|
2074 |
|
|
|
2075 |
/* Returns pointer to signature string read from PNG header */
|
|
|
2076 |
PNG_EXPORT(130, png_const_bytep, png_get_signature,
|
|
|
2077 |
(png_const_structp png_ptr, png_infop info_ptr));
|
|
|
2078 |
|
|
|
2079 |
#ifdef PNG_bKGD_SUPPORTED
|
|
|
2080 |
PNG_EXPORT(131, png_uint_32, png_get_bKGD,
|
|
|
2081 |
(png_const_structp png_ptr, png_infop info_ptr,
|
|
|
2082 |
png_color_16p *background));
|
|
|
2083 |
#endif
|
|
|
2084 |
|
|
|
2085 |
#ifdef PNG_bKGD_SUPPORTED
|
|
|
2086 |
PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
|
|
|
2087 |
png_const_color_16p background));
|
|
|
2088 |
#endif
|
|
|
2089 |
|
|
|
2090 |
#ifdef PNG_cHRM_SUPPORTED
|
|
|
2091 |
PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr,
|
|
|
2092 |
png_const_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|
|
2093 |
double *red_y, double *green_x, double *green_y, double *blue_x,
|
|
|
2094 |
double *blue_y))
|
|
|
2095 |
PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr,
|
|
|
2096 |
png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z,
|
|
|
2097 |
double *green_X, double *green_Y, double *green_Z, double *blue_X,
|
|
|
2098 |
double *blue_Y, double *blue_Z))
|
|
|
2099 |
#ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */
|
|
|
2100 |
PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,
|
|
|
2101 |
(png_const_structp png_ptr,
|
|
|
2102 |
png_const_infop info_ptr, png_fixed_point *int_white_x,
|
|
|
2103 |
png_fixed_point *int_white_y, png_fixed_point *int_red_x,
|
|
|
2104 |
png_fixed_point *int_red_y, png_fixed_point *int_green_x,
|
|
|
2105 |
png_fixed_point *int_green_y, png_fixed_point *int_blue_x,
|
|
|
2106 |
png_fixed_point *int_blue_y))
|
|
|
2107 |
#endif
|
|
|
2108 |
PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed,
|
|
|
2109 |
(png_structp png_ptr, png_const_infop info_ptr,
|
|
|
2110 |
png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
|
|
|
2111 |
png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
|
|
|
2112 |
png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
|
|
|
2113 |
png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
|
|
|
2114 |
png_fixed_point *int_blue_Z))
|
|
|
2115 |
#endif
|
|
|
2116 |
|
|
|
2117 |
#ifdef PNG_cHRM_SUPPORTED
|
|
|
2118 |
PNG_FP_EXPORT(135, void, png_set_cHRM,
|
|
|
2119 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2120 |
double white_x, double white_y, double red_x, double red_y, double green_x,
|
|
|
2121 |
double green_y, double blue_x, double blue_y))
|
|
|
2122 |
PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr,
|
|
|
2123 |
png_infop info_ptr, double red_X, double red_Y, double red_Z,
|
|
|
2124 |
double green_X, double green_Y, double green_Z, double blue_X,
|
|
|
2125 |
double blue_Y, double blue_Z))
|
|
|
2126 |
PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr,
|
|
|
2127 |
png_infop info_ptr, png_fixed_point int_white_x,
|
|
|
2128 |
png_fixed_point int_white_y, png_fixed_point int_red_x,
|
|
|
2129 |
png_fixed_point int_red_y, png_fixed_point int_green_x,
|
|
|
2130 |
png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
|
2131 |
png_fixed_point int_blue_y))
|
|
|
2132 |
PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr,
|
|
|
2133 |
png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
|
|
|
2134 |
png_fixed_point int_red_Z, png_fixed_point int_green_X,
|
|
|
2135 |
png_fixed_point int_green_Y, png_fixed_point int_green_Z,
|
|
|
2136 |
png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
|
|
|
2137 |
png_fixed_point int_blue_Z))
|
|
|
2138 |
#endif
|
|
|
2139 |
|
|
|
2140 |
#ifdef PNG_gAMA_SUPPORTED
|
|
|
2141 |
PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA,
|
|
|
2142 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2143 |
double *file_gamma))
|
|
|
2144 |
PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed,
|
|
|
2145 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2146 |
png_fixed_point *int_file_gamma))
|
|
|
2147 |
#endif
|
|
|
2148 |
|
|
|
2149 |
#ifdef PNG_gAMA_SUPPORTED
|
|
|
2150 |
PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr,
|
|
|
2151 |
png_infop info_ptr, double file_gamma))
|
|
|
2152 |
PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr,
|
|
|
2153 |
png_infop info_ptr, png_fixed_point int_file_gamma))
|
|
|
2154 |
#endif
|
|
|
2155 |
|
|
|
2156 |
#ifdef PNG_hIST_SUPPORTED
|
|
|
2157 |
PNG_EXPORT(141, png_uint_32, png_get_hIST,
|
|
|
2158 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2159 |
png_uint_16p *hist));
|
|
|
2160 |
#endif
|
|
|
2161 |
|
|
|
2162 |
#ifdef PNG_hIST_SUPPORTED
|
|
|
2163 |
PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr,
|
|
|
2164 |
png_infop info_ptr, png_const_uint_16p hist));
|
|
|
2165 |
#endif
|
|
|
2166 |
|
|
|
2167 |
PNG_EXPORT(143, png_uint_32, png_get_IHDR,
|
|
|
2168 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2169 |
png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type,
|
|
|
2170 |
int *interlace_method, int *compression_method, int *filter_method));
|
|
|
2171 |
|
|
|
2172 |
PNG_EXPORT(144, void, png_set_IHDR,
|
|
|
2173 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2174 |
png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
|
|
|
2175 |
int interlace_method, int compression_method, int filter_method));
|
|
|
2176 |
|
|
|
2177 |
#ifdef PNG_oFFs_SUPPORTED
|
|
|
2178 |
PNG_EXPORT(145, png_uint_32, png_get_oFFs,
|
|
|
2179 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2180 |
png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type));
|
|
|
2181 |
#endif
|
|
|
2182 |
|
|
|
2183 |
#ifdef PNG_oFFs_SUPPORTED
|
|
|
2184 |
PNG_EXPORT(146, void, png_set_oFFs,
|
|
|
2185 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2186 |
png_int_32 offset_x, png_int_32 offset_y, int unit_type));
|
|
|
2187 |
#endif
|
|
|
2188 |
|
|
|
2189 |
#ifdef PNG_pCAL_SUPPORTED
|
|
|
2190 |
PNG_EXPORT(147, png_uint_32, png_get_pCAL,
|
|
|
2191 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2192 |
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type,
|
|
|
2193 |
int *nparams,
|
|
|
2194 |
png_charp *units, png_charpp *params));
|
|
|
2195 |
#endif
|
|
|
2196 |
|
|
|
2197 |
#ifdef PNG_pCAL_SUPPORTED
|
|
|
2198 |
PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr,
|
|
|
2199 |
png_infop info_ptr,
|
|
|
2200 |
png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
|
|
|
2201 |
int nparams, png_const_charp units, png_charpp params));
|
|
|
2202 |
#endif
|
|
|
2203 |
|
|
|
2204 |
#ifdef PNG_pHYs_SUPPORTED
|
|
|
2205 |
PNG_EXPORT(149, png_uint_32, png_get_pHYs,
|
|
|
2206 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2207 |
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
|
2208 |
#endif
|
|
|
2209 |
|
|
|
2210 |
#ifdef PNG_pHYs_SUPPORTED
|
|
|
2211 |
PNG_EXPORT(150, void, png_set_pHYs,
|
|
|
2212 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2213 |
png_uint_32 res_x, png_uint_32 res_y, int unit_type));
|
|
|
2214 |
#endif
|
|
|
2215 |
|
|
|
2216 |
PNG_EXPORT(151, png_uint_32, png_get_PLTE,
|
|
|
2217 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2218 |
png_colorp *palette, int *num_palette));
|
|
|
2219 |
|
|
|
2220 |
PNG_EXPORT(152, void, png_set_PLTE,
|
|
|
2221 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2222 |
png_const_colorp palette, int num_palette));
|
|
|
2223 |
|
|
|
2224 |
#ifdef PNG_sBIT_SUPPORTED
|
|
|
2225 |
PNG_EXPORT(153, png_uint_32, png_get_sBIT,
|
|
|
2226 |
(png_const_structp png_ptr, png_infop info_ptr,
|
|
|
2227 |
png_color_8p *sig_bit));
|
|
|
2228 |
#endif
|
|
|
2229 |
|
|
|
2230 |
#ifdef PNG_sBIT_SUPPORTED
|
|
|
2231 |
PNG_EXPORT(154, void, png_set_sBIT,
|
|
|
2232 |
(png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit));
|
|
|
2233 |
#endif
|
|
|
2234 |
|
|
|
2235 |
#ifdef PNG_sRGB_SUPPORTED
|
|
|
2236 |
PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr,
|
|
|
2237 |
png_const_infop info_ptr, int *file_srgb_intent));
|
|
|
2238 |
#endif
|
|
|
2239 |
|
|
|
2240 |
#ifdef PNG_sRGB_SUPPORTED
|
|
|
2241 |
PNG_EXPORT(156, void, png_set_sRGB,
|
|
|
2242 |
(png_structp png_ptr, png_infop info_ptr, int srgb_intent));
|
|
|
2243 |
PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr,
|
|
|
2244 |
png_infop info_ptr, int srgb_intent));
|
|
|
2245 |
#endif
|
|
|
2246 |
|
|
|
2247 |
#ifdef PNG_iCCP_SUPPORTED
|
|
|
2248 |
PNG_EXPORT(158, png_uint_32, png_get_iCCP,
|
|
|
2249 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2250 |
png_charpp name, int *compression_type, png_bytepp profile,
|
|
|
2251 |
png_uint_32 *proflen));
|
|
|
2252 |
#endif
|
|
|
2253 |
|
|
|
2254 |
#ifdef PNG_iCCP_SUPPORTED
|
|
|
2255 |
PNG_EXPORT(159, void, png_set_iCCP,
|
|
|
2256 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2257 |
png_const_charp name, int compression_type, png_const_bytep profile,
|
|
|
2258 |
png_uint_32 proflen));
|
|
|
2259 |
#endif
|
|
|
2260 |
|
|
|
2261 |
#ifdef PNG_sPLT_SUPPORTED
|
|
|
2262 |
PNG_EXPORT(160, png_uint_32, png_get_sPLT,
|
|
|
2263 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2264 |
png_sPLT_tpp entries));
|
|
|
2265 |
#endif
|
|
|
2266 |
|
|
|
2267 |
#ifdef PNG_sPLT_SUPPORTED
|
|
|
2268 |
PNG_EXPORT(161, void, png_set_sPLT,
|
|
|
2269 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2270 |
png_const_sPLT_tp entries, int nentries));
|
|
|
2271 |
#endif
|
|
|
2272 |
|
|
|
2273 |
#ifdef PNG_TEXT_SUPPORTED
|
|
|
2274 |
/* png_get_text also returns the number of text chunks in *num_text */
|
|
|
2275 |
PNG_EXPORT(162, png_uint_32, png_get_text,
|
|
|
2276 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2277 |
png_textp *text_ptr, int *num_text));
|
|
|
2278 |
#endif
|
|
|
2279 |
|
|
|
2280 |
/* Note while png_set_text() will accept a structure whose text,
|
|
|
2281 |
* language, and translated keywords are NULL pointers, the structure
|
|
|
2282 |
* returned by png_get_text will always contain regular
|
|
|
2283 |
* zero-terminated C strings. They might be empty strings but
|
|
|
2284 |
* they will never be NULL pointers.
|
|
|
2285 |
*/
|
|
|
2286 |
|
|
|
2287 |
#ifdef PNG_TEXT_SUPPORTED
|
|
|
2288 |
PNG_EXPORT(163, void, png_set_text,
|
|
|
2289 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2290 |
png_const_textp text_ptr, int num_text));
|
|
|
2291 |
#endif
|
|
|
2292 |
|
|
|
2293 |
#ifdef PNG_tIME_SUPPORTED
|
|
|
2294 |
PNG_EXPORT(164, png_uint_32, png_get_tIME,
|
|
|
2295 |
(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time));
|
|
|
2296 |
#endif
|
|
|
2297 |
|
|
|
2298 |
#ifdef PNG_tIME_SUPPORTED
|
|
|
2299 |
PNG_EXPORT(165, void, png_set_tIME,
|
|
|
2300 |
(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time));
|
|
|
2301 |
#endif
|
|
|
2302 |
|
|
|
2303 |
#ifdef PNG_tRNS_SUPPORTED
|
|
|
2304 |
PNG_EXPORT(166, png_uint_32, png_get_tRNS,
|
|
|
2305 |
(png_const_structp png_ptr, png_infop info_ptr,
|
|
|
2306 |
png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color));
|
|
|
2307 |
#endif
|
|
|
2308 |
|
|
|
2309 |
#ifdef PNG_tRNS_SUPPORTED
|
|
|
2310 |
PNG_EXPORT(167, void, png_set_tRNS,
|
|
|
2311 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2312 |
png_const_bytep trans_alpha, int num_trans,
|
|
|
2313 |
png_const_color_16p trans_color));
|
|
|
2314 |
#endif
|
|
|
2315 |
|
|
|
2316 |
#ifdef PNG_sCAL_SUPPORTED
|
|
|
2317 |
PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL,
|
|
|
2318 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2319 |
int *unit, double *width, double *height))
|
|
|
2320 |
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
|
|
|
2321 |
/* NOTE: this API is currently implemented using floating point arithmetic,
|
|
|
2322 |
* consequently it can only be used on systems with floating point support.
|
|
|
2323 |
* In any case the range of values supported by png_fixed_point is small and it
|
|
|
2324 |
* is highly recommended that png_get_sCAL_s be used instead.
|
|
|
2325 |
*/
|
|
|
2326 |
PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,
|
|
|
2327 |
(png_structp png_ptr, png_const_infop info_ptr, int *unit,
|
|
|
2328 |
png_fixed_point *width,
|
|
|
2329 |
png_fixed_point *height))
|
|
|
2330 |
#endif
|
|
|
2331 |
PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,
|
|
|
2332 |
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
|
2333 |
int *unit, png_charpp swidth, png_charpp sheight));
|
|
|
2334 |
|
|
|
2335 |
PNG_FP_EXPORT(170, void, png_set_sCAL,
|
|
|
2336 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2337 |
int unit, double width, double height))
|
|
|
2338 |
PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr,
|
|
|
2339 |
png_infop info_ptr, int unit, png_fixed_point width,
|
|
|
2340 |
png_fixed_point height))
|
|
|
2341 |
PNG_EXPORT(171, void, png_set_sCAL_s,
|
|
|
2342 |
(png_structp png_ptr, png_infop info_ptr,
|
|
|
2343 |
int unit, png_const_charp swidth, png_const_charp sheight));
|
|
|
2344 |
#endif /* PNG_sCAL_SUPPORTED */
|
|
|
2345 |
|
|
|
2346 |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
|
2347 |
/* Provide a list of chunks and how they are to be handled, if the built-in
|
|
|
2348 |
handling or default unknown chunk handling is not desired. Any chunks not
|
|
|
2349 |
listed will be handled in the default manner. The IHDR and IEND chunks
|
|
|
2350 |
must not be listed. Because this turns off the default handling for chunks
|
|
|
2351 |
that would otherwise be recognized the behavior of libpng transformations may
|
|
|
2352 |
well become incorrect!
|
|
|
2353 |
keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior
|
|
|
2354 |
= 1: PNG_HANDLE_CHUNK_NEVER: do not keep
|
|
|
2355 |
= 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy
|
|
|
2356 |
= 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy
|
|
|
2357 |
*/
|
|
|
2358 |
PNG_EXPORT(172, void, png_set_keep_unknown_chunks,
|
|
|
2359 |
(png_structp png_ptr, int keep,
|
|
|
2360 |
png_const_bytep chunk_list, int num_chunks));
|
|
|
2361 |
|
|
|
2362 |
/* The handling code is returned; the result is therefore true (non-zero) if
|
|
|
2363 |
* special handling is required, false for the default handling.
|
|
|
2364 |
*/
|
|
|
2365 |
PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr,
|
|
|
2366 |
png_const_bytep chunk_name));
|
|
|
2367 |
#endif
|
|
|
2368 |
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|
|
2369 |
PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr,
|
|
|
2370 |
png_infop info_ptr, png_const_unknown_chunkp unknowns,
|
|
|
2371 |
int num_unknowns));
|
|
|
2372 |
PNG_EXPORT(175, void, png_set_unknown_chunk_location,
|
|
|
2373 |
(png_structp png_ptr, png_infop info_ptr, int chunk, int location));
|
|
|
2374 |
PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr,
|
|
|
2375 |
png_const_infop info_ptr, png_unknown_chunkpp entries));
|
|
|
2376 |
#endif
|
|
|
2377 |
|
|
|
2378 |
/* Png_free_data() will turn off the "valid" flag for anything it frees.
|
|
|
2379 |
* If you need to turn it off for a chunk that your application has freed,
|
|
|
2380 |
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
|
|
|
2381 |
*/
|
|
|
2382 |
PNG_EXPORT(177, void, png_set_invalid,
|
|
|
2383 |
(png_structp png_ptr, png_infop info_ptr, int mask));
|
|
|
2384 |
|
|
|
2385 |
#ifdef PNG_INFO_IMAGE_SUPPORTED
|
|
|
2386 |
/* The "params" pointer is currently not used and is for future expansion. */
|
|
|
2387 |
PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr,
|
|
|
2388 |
int transforms, png_voidp params));
|
|
|
2389 |
PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr,
|
|
|
2390 |
int transforms, png_voidp params));
|
|
|
2391 |
#endif
|
|
|
2392 |
|
|
|
2393 |
PNG_EXPORT(180, png_const_charp, png_get_copyright,
|
|
|
2394 |
(png_const_structp png_ptr));
|
|
|
2395 |
PNG_EXPORT(181, png_const_charp, png_get_header_ver,
|
|
|
2396 |
(png_const_structp png_ptr));
|
|
|
2397 |
PNG_EXPORT(182, png_const_charp, png_get_header_version,
|
|
|
2398 |
(png_const_structp png_ptr));
|
|
|
2399 |
PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,
|
|
|
2400 |
(png_const_structp png_ptr));
|
|
|
2401 |
|
|
|
2402 |
#ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
|
2403 |
PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr,
|
|
|
2404 |
png_uint_32 mng_features_permitted));
|
|
|
2405 |
#endif
|
|
|
2406 |
|
|
|
2407 |
/* For use in png_set_keep_unknown, added to version 1.2.6 */
|
|
|
2408 |
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
|
|
|
2409 |
#define PNG_HANDLE_CHUNK_NEVER 1
|
|
|
2410 |
#define PNG_HANDLE_CHUNK_IF_SAFE 2
|
|
|
2411 |
#define PNG_HANDLE_CHUNK_ALWAYS 3
|
|
|
2412 |
|
|
|
2413 |
/* Strip the prepended error numbers ("#nnn ") from error and warning
|
|
|
2414 |
* messages before passing them to the error or warning handler.
|
|
|
2415 |
*/
|
|
|
2416 |
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
|
2417 |
PNG_EXPORT(185, void, png_set_strip_error_numbers,
|
|
|
2418 |
(png_structp png_ptr,
|
|
|
2419 |
png_uint_32 strip_mode));
|
|
|
2420 |
#endif
|
|
|
2421 |
|
|
|
2422 |
/* Added in libpng-1.2.6 */
|
|
|
2423 |
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
|
2424 |
PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr,
|
|
|
2425 |
png_uint_32 user_width_max, png_uint_32 user_height_max));
|
|
|
2426 |
PNG_EXPORT(187, png_uint_32, png_get_user_width_max,
|
|
|
2427 |
(png_const_structp png_ptr));
|
|
|
2428 |
PNG_EXPORT(188, png_uint_32, png_get_user_height_max,
|
|
|
2429 |
(png_const_structp png_ptr));
|
|
|
2430 |
/* Added in libpng-1.4.0 */
|
|
|
2431 |
PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr,
|
|
|
2432 |
png_uint_32 user_chunk_cache_max));
|
|
|
2433 |
PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,
|
|
|
2434 |
(png_const_structp png_ptr));
|
|
|
2435 |
/* Added in libpng-1.4.1 */
|
|
|
2436 |
PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr,
|
|
|
2437 |
png_alloc_size_t user_chunk_cache_max));
|
|
|
2438 |
PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,
|
|
|
2439 |
(png_const_structp png_ptr));
|
|
|
2440 |
#endif
|
|
|
2441 |
|
|
|
2442 |
#if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
|
|
|
2443 |
PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,
|
|
|
2444 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2445 |
|
|
|
2446 |
PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,
|
|
|
2447 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2448 |
|
|
|
2449 |
PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,
|
|
|
2450 |
(png_const_structp png_ptr, png_const_infop info_ptr));
|
|
|
2451 |
|
|
|
2452 |
PNG_FP_EXPORT(196, float, png_get_x_offset_inches,
|
|
|
2453 |
(png_const_structp png_ptr, png_const_infop info_ptr))
|
|
|
2454 |
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
|
|
|
2455 |
PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed,
|
|
|
2456 |
(png_structp png_ptr, png_const_infop info_ptr))
|
|
|
2457 |
#endif
|
|
|
2458 |
|
|
|
2459 |
PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr,
|
|
|
2460 |
png_const_infop info_ptr))
|
|
|
2461 |
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
|
|
|
2462 |
PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed,
|
|
|
2463 |
(png_structp png_ptr, png_const_infop info_ptr))
|
|
|
2464 |
#endif
|
|
|
2465 |
|
|
|
2466 |
# ifdef PNG_pHYs_SUPPORTED
|
|
|
2467 |
PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr,
|
|
|
2468 |
png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
|
|
|
2469 |
int *unit_type));
|
|
|
2470 |
# endif /* PNG_pHYs_SUPPORTED */
|
|
|
2471 |
#endif /* PNG_INCH_CONVERSIONS_SUPPORTED */
|
|
|
2472 |
|
|
|
2473 |
/* Added in libpng-1.4.0 */
|
|
|
2474 |
#ifdef PNG_IO_STATE_SUPPORTED
|
|
|
2475 |
PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr));
|
|
|
2476 |
|
|
|
2477 |
PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name,
|
|
|
2478 |
(png_structp png_ptr), PNG_DEPRECATED);
|
|
|
2479 |
PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,
|
|
|
2480 |
(png_const_structp png_ptr));
|
|
|
2481 |
|
|
|
2482 |
/* The flags returned by png_get_io_state() are the following: */
|
|
|
2483 |
# define PNG_IO_NONE 0x0000 /* no I/O at this moment */
|
|
|
2484 |
# define PNG_IO_READING 0x0001 /* currently reading */
|
|
|
2485 |
# define PNG_IO_WRITING 0x0002 /* currently writing */
|
|
|
2486 |
# define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */
|
|
|
2487 |
# define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */
|
|
|
2488 |
# define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */
|
|
|
2489 |
# define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */
|
|
|
2490 |
# define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */
|
|
|
2491 |
# define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */
|
|
|
2492 |
#endif /* ?PNG_IO_STATE_SUPPORTED */
|
|
|
2493 |
|
|
|
2494 |
/* Interlace support. The following macros are always defined so that if
|
|
|
2495 |
* libpng interlace handling is turned off the macros may be used to handle
|
|
|
2496 |
* interlaced images within the application.
|
|
|
2497 |
*/
|
|
|
2498 |
#define PNG_INTERLACE_ADAM7_PASSES 7
|
|
|
2499 |
|
|
|
2500 |
/* Two macros to return the first row and first column of the original,
|
|
|
2501 |
* full, image which appears in a given pass. 'pass' is in the range 0
|
|
|
2502 |
* to 6 and the result is in the range 0 to 7.
|
|
|
2503 |
*/
|
|
|
2504 |
#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)
|
|
|
2505 |
#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)
|
|
|
2506 |
|
|
|
2507 |
/* A macro to return the offset between pixels in the output row for a pair of
|
|
|
2508 |
* pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
|
|
|
2509 |
* follows. Note that ROW_OFFSET is the offset from one row to the next whereas
|
|
|
2510 |
* COL_OFFSET is from one column to the next, within a row.
|
|
|
2511 |
*/
|
|
|
2512 |
#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)
|
|
|
2513 |
#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))
|
|
|
2514 |
|
|
|
2515 |
/* Two macros to help evaluate the number of rows or columns in each
|
|
|
2516 |
* pass. This is expressed as a shift - effectively log2 of the number or
|
|
|
2517 |
* rows or columns in each 8x8 tile of the original image.
|
|
|
2518 |
*/
|
|
|
2519 |
#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
|
|
|
2520 |
#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
|
|
|
2521 |
|
|
|
2522 |
/* Hence two macros to determine the number of rows or columns in a given
|
|
|
2523 |
* pass of an image given its height or width. In fact these macros may
|
|
|
2524 |
* return non-zero even though the sub-image is empty, because the other
|
|
|
2525 |
* dimension may be empty for a small image.
|
|
|
2526 |
*/
|
|
|
2527 |
#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
|
|
|
2528 |
-1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
|
|
|
2529 |
#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
|
|
|
2530 |
-1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
|
|
|
2531 |
|
|
|
2532 |
/* For the reader row callbacks (both progressive and sequential) it is
|
|
|
2533 |
* necessary to find the row in the output image given a row in an interlaced
|
|
|
2534 |
* image, so two more macros:
|
|
|
2535 |
*/
|
|
|
2536 |
#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
|
|
|
2537 |
(((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
|
|
|
2538 |
#define PNG_COL_FROM_PASS_COL(xIn, pass) \
|
|
|
2539 |
(((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
|
|
|
2540 |
|
|
|
2541 |
/* Two macros which return a boolean (0 or 1) saying whether the given row
|
|
|
2542 |
* or column is in a particular pass. These use a common utility macro that
|
|
|
2543 |
* returns a mask for a given pass - the offset 'off' selects the row or
|
|
|
2544 |
* column version. The mask has the appropriate bit set for each column in
|
|
|
2545 |
* the tile.
|
|
|
2546 |
*/
|
|
|
2547 |
#define PNG_PASS_MASK(pass,off) ( \
|
|
|
2548 |
((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \
|
|
|
2549 |
((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))
|
|
|
2550 |
|
|
|
2551 |
#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
|
|
|
2552 |
((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
|
|
|
2553 |
#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
|
|
|
2554 |
((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
|
|
|
2555 |
|
|
|
2556 |
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
|
|
|
2557 |
/* With these routines we avoid an integer divide, which will be slower on
|
|
|
2558 |
* most machines. However, it does take more operations than the corresponding
|
|
|
2559 |
* divide method, so it may be slower on a few RISC systems. There are two
|
|
|
2560 |
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
|
|
2561 |
*
|
|
|
2562 |
* Note that the rounding factors are NOT supposed to be the same! 128 and
|
|
|
2563 |
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
|
|
2564 |
* standard method.
|
|
|
2565 |
*
|
|
|
2566 |
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
|
|
2567 |
*/
|
|
|
2568 |
|
|
|
2569 |
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
|
|
2570 |
|
|
|
2571 |
# define png_composite(composite, fg, alpha, bg) \
|
|
|
2572 |
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \
|
|
|
2573 |
* (png_uint_16)(alpha) \
|
|
|
2574 |
+ (png_uint_16)(bg)*(png_uint_16)(255 \
|
|
|
2575 |
- (png_uint_16)(alpha)) + 128); \
|
|
|
2576 |
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
|
|
|
2577 |
|
|
|
2578 |
# define png_composite_16(composite, fg, alpha, bg) \
|
|
|
2579 |
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \
|
|
|
2580 |
* (png_uint_32)(alpha) \
|
|
|
2581 |
+ (png_uint_32)(bg)*(65535 \
|
|
|
2582 |
- (png_uint_32)(alpha)) + 32768); \
|
|
|
2583 |
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
|
|
|
2584 |
|
|
|
2585 |
#else /* Standard method using integer division */
|
|
|
2586 |
|
|
|
2587 |
# define png_composite(composite, fg, alpha, bg) \
|
|
|
2588 |
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
|
|
2589 |
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
|
|
|
2590 |
127) / 255)
|
|
|
2591 |
|
|
|
2592 |
# define png_composite_16(composite, fg, alpha, bg) \
|
|
|
2593 |
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
|
|
2594 |
(png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \
|
|
|
2595 |
32767) / 65535)
|
|
|
2596 |
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
|
|
2597 |
|
|
|
2598 |
#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
|
|
|
2599 |
PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
|
|
|
2600 |
PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));
|
|
|
2601 |
PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf));
|
|
|
2602 |
#endif
|
|
|
2603 |
|
|
|
2604 |
PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr,
|
|
|
2605 |
png_const_bytep buf));
|
|
|
2606 |
/* No png_get_int_16 -- may be added if there's a real need for it. */
|
|
|
2607 |
|
|
|
2608 |
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
|
|
|
2609 |
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
|
|
|
2610 |
PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));
|
|
|
2611 |
#endif
|
|
|
2612 |
#ifdef PNG_SAVE_INT_32_SUPPORTED
|
|
|
2613 |
PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));
|
|
|
2614 |
#endif
|
|
|
2615 |
|
|
|
2616 |
/* Place a 16-bit number into a buffer in PNG byte order.
|
|
|
2617 |
* The parameter is declared unsigned int, not png_uint_16,
|
|
|
2618 |
* just to avoid potential problems on pre-ANSI C compilers.
|
|
|
2619 |
*/
|
|
|
2620 |
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
|
|
|
2621 |
PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
|
|
|
2622 |
/* No png_save_int_16 -- may be added if there's a real need for it. */
|
|
|
2623 |
#endif
|
|
|
2624 |
|
|
|
2625 |
#ifdef PNG_USE_READ_MACROS
|
|
|
2626 |
/* Inline macros to do direct reads of bytes from the input buffer.
|
|
|
2627 |
* The png_get_int_32() routine assumes we are using two's complement
|
|
|
2628 |
* format for negative values, which is almost certainly true.
|
|
|
2629 |
*/
|
|
|
2630 |
# define png_get_uint_32(buf) \
|
|
|
2631 |
(((png_uint_32)(*(buf)) << 24) + \
|
|
|
2632 |
((png_uint_32)(*((buf) + 1)) << 16) + \
|
|
|
2633 |
((png_uint_32)(*((buf) + 2)) << 8) + \
|
|
|
2634 |
((png_uint_32)(*((buf) + 3))))
|
|
|
2635 |
|
|
|
2636 |
/* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
|
|
|
2637 |
* function) incorrectly returned a value of type png_uint_32.
|
|
|
2638 |
*/
|
|
|
2639 |
# define png_get_uint_16(buf) \
|
|
|
2640 |
((png_uint_16) \
|
|
|
2641 |
(((unsigned int)(*(buf)) << 8) + \
|
|
|
2642 |
((unsigned int)(*((buf) + 1)))))
|
|
|
2643 |
|
|
|
2644 |
# define png_get_int_32(buf) \
|
|
|
2645 |
((png_int_32)((*(buf) & 0x80) \
|
|
|
2646 |
? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
|
|
|
2647 |
: (png_int_32)png_get_uint_32(buf)))
|
|
|
2648 |
#endif
|
|
|
2649 |
|
|
|
2650 |
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
|
|
|
2651 |
defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
|
|
|
2652 |
PNG_EXPORT(234, void, png_set_check_for_invalid_index, (png_structp png_ptr,
|
|
|
2653 |
int allowed));
|
|
|
2654 |
#endif
|
|
|
2655 |
|
|
|
2656 |
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
|
|
|
2657 |
* defs
|
|
|
2658 |
*/
|
|
|
2659 |
|
|
|
2660 |
/* The last ordinal number (this is the *last* one already used; the next
|
|
|
2661 |
* one to use is one more than this.) Maintainer, remember to add an entry to
|
|
|
2662 |
* scripts/symbols.def as well.
|
|
|
2663 |
*/
|
|
|
2664 |
#ifdef PNG_EXPORT_LAST_ORDINAL
|
|
|
2665 |
PNG_EXPORT_LAST_ORDINAL(234);
|
|
|
2666 |
#endif
|
|
|
2667 |
|
|
|
2668 |
#ifdef __cplusplus
|
|
|
2669 |
}
|
|
|
2670 |
#endif
|
|
|
2671 |
|
|
|
2672 |
#endif /* PNG_VERSION_INFO_ONLY */
|
|
|
2673 |
/* Do not put anything past this line */
|
|
|
2674 |
#endif /* PNG_H */
|