mirror of https://github.com/buggins/dlangui.git
2617 lines
106 KiB
D
2617 lines
106 KiB
D
module libpng.png;
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/* png.h - header file for PNG reference library
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*
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* libpng version 1.5.14 - January 24, 2013
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* Copyright (c) 1998-2013 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 1.5.14 - January 24, 2013: 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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* 1.5.14beta01-08 15 10514 15.so.15.14[.0]
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* 1.5.14rc01-03 15 10514 15.so.15.14[.0]
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* 1.5.14 15 10514 15.so.15.14[.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 1.5.14, January 24, 2013, are
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* Copyright (c) 2004, 2006-2013 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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* Kevin Bracey
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* Sam Bushell
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* Magnus Holmgren
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* Greg Roelofs
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* Tom Tanner
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*
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* libpng versions 0.5, May 1995, through 0.88, January 1996, are
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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*
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* For the purposes of this copyright and license, "Contributing Authors"
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* is defined as the following set of individuals:
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*
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* Andreas Dilger
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* Dave Martindale
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* Guy Eric Schalnat
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* Paul Schmidt
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* Tim Wegner
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*
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* The PNG Reference Library is supplied "AS IS". The Contributing Authors
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* and Group 42, Inc. disclaim all warranties, expressed or implied,
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* including, without limitation, the warranties of merchantability and of
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* fitness for any purpose. The Contributing Authors and Group 42, Inc.
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* assume no liability for direct, indirect, incidental, special, exemplary,
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* or consequential damages, which may result from the use of the PNG
|
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* Reference Library, even if advised of the possibility of such damage.
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*
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* Permission is hereby granted to use, copy, modify, and distribute this
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* source code, or portions hereof, for any purpose, without fee, subject
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* to the following restrictions:
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*
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* 1. The origin of this source code must not be misrepresented.
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*
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* 2. Altered versions must be plainly marked as such and must not
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* be misrepresented as being the original source.
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*
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* 3. This Copyright notice may not be removed or altered from
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* any source or altered source distribution.
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*
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* The Contributing Authors and Group 42, Inc. specifically permit, without
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* fee, and encourage the use of this source code as a component to
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* supporting the PNG file format in commercial products. If you use this
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* source code in a product, acknowledgment is not required but would be
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* appreciated.
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*/
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/*
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* A "png_get_copyright" function is available, for convenient use in "about"
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* boxes and the like:
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*
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* printf("%s", png_get_copyright(NULL);
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*
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* Also, the PNG logo (in PNG format, of course) is supplied in the
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* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
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*/
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/*
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* Libpng is OSI Certified Open Source Software. OSI Certified is a
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* certification mark of the Open Source Initiative.
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*/
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/*
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* The contributing authors would like to thank all those who helped
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* with testing, bug fixes, and patience. This wouldn't have been
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* possible without all of you.
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*
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* Thanks to Frank J. T. Wojcik for helping with the documentation.
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*/
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/*
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* Y2K compliance in libpng:
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* =========================
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*
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* January 24, 2013
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*
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* Since the PNG Development group is an ad-hoc body, we can't make
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* an official declaration.
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*
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* This is your unofficial assurance that libpng from version 0.71 and
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* upward through 1.5.14 are Y2K compliant. It is my belief that
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* earlier versions were also Y2K compliant.
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*
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* Libpng only has two year fields. One is a 2-byte unsigned integer
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* that will hold years up to 65535. The other holds the date in text
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* format, and will hold years up to 9999.
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*
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* The integer is
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* "png_uint_16 year" in png_time_struct.
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*
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* The string is
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* "char time_buffer[29]" in png_struct. This will be no
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* longer used in libpng-1.6.0 and will be removed from libpng-1.7.0.
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*
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* There are seven time-related functions:
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* png.c: png_convert_to_rfc_1123() in png.c
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* (formerly png_convert_to_rfc_1152() in error)
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* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
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* png_convert_from_time_t() in pngwrite.c
|
|
* png_get_tIME() in pngget.c
|
|
* png_handle_tIME() in pngrutil.c, called in pngread.c
|
|
* png_set_tIME() in pngset.c
|
|
* png_write_tIME() in pngwutil.c, called in pngwrite.c
|
|
*
|
|
* All handle dates properly in a Y2K environment. The
|
|
* png_convert_from_time_t() function calls gmtime() to convert from system
|
|
* clock time, which returns (year - 1900), which we properly convert to
|
|
* the full 4-digit year. There is a possibility that applications using
|
|
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
|
|
* function, or that they are incorrectly passing only a 2-digit year
|
|
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
|
|
* but this is not under our control. The libpng documentation has always
|
|
* stated that it works with 4-digit years, and the APIs have been
|
|
* documented as such.
|
|
*
|
|
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|
* integer to hold the year, and can hold years as large as 65535.
|
|
*
|
|
* zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|
* no date-related code.
|
|
*
|
|
* Glenn Randers-Pehrson
|
|
* libpng maintainer
|
|
* PNG Development Group
|
|
*/
|
|
|
|
/* This is not the place to learn how to use libpng. The file libpng-manual.txt
|
|
* describes how to use libpng, and the file example.c summarizes it
|
|
* with some code on which to build. This file is useful for looking
|
|
* at the actual function definitions and structure components.
|
|
*
|
|
* If you just need to read a PNG file and don't want to read the documentation
|
|
* skip to the end of this file and read the section entitled 'simplified API'.
|
|
*/
|
|
|
|
/* Version information for png.h - this should match the version in png.c */
|
|
enum PNG_LIBPNG_VER_STRING = "1.5.14";
|
|
enum PNG_HEADER_VERSION_STRING =
|
|
" libpng version 1.5.14 - January 24, 2013\n";
|
|
|
|
enum PNG_LIBPNG_VER_SONUM = 15;
|
|
enum PNG_LIBPNG_VER_DLLNUM = 15;
|
|
|
|
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
|
|
enum PNG_LIBPNG_VER_MAJOR = 1;
|
|
enum PNG_LIBPNG_VER_MINOR = 5;
|
|
enum PNG_LIBPNG_VER_RELEASE = 14;
|
|
|
|
/* This should match the numeric part of the final component of
|
|
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
|
|
*/
|
|
|
|
enum PNG_LIBPNG_VER_BUILD = 0;
|
|
|
|
/* Release Status */
|
|
enum PNG_LIBPNG_BUILD_ALPHA = 1;
|
|
enum PNG_LIBPNG_BUILD_BETA = 2;
|
|
enum PNG_LIBPNG_BUILD_RC = 3;
|
|
enum PNG_LIBPNG_BUILD_STABLE = 4;
|
|
enum PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK = 7;
|
|
|
|
/* Release-Specific Flags */
|
|
enum PNG_LIBPNG_BUILD_PATCH = 8; /* Can be OR'ed with
|
|
PNG_LIBPNG_BUILD_STABLE only */
|
|
enum PNG_LIBPNG_BUILD_PRIVATE = 16; /* Cannot be OR'ed with
|
|
PNG_LIBPNG_BUILD_SPECIAL */
|
|
enum PNG_LIBPNG_BUILD_SPECIAL = 32; /* Cannot be OR'ed with
|
|
PNG_LIBPNG_BUILD_PRIVATE */
|
|
|
|
alias PNG_LIBPNG_BUILD_BASE_TYPE = PNG_LIBPNG_BUILD_STABLE;
|
|
|
|
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
|
|
* We must not include leading zeros.
|
|
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
|
|
* version 1.0.0 was mis-numbered 100 instead of 10000). From
|
|
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
|
|
*/
|
|
enum PNG_LIBPNG_VER = 10514; /* 1.5.14 */
|
|
|
|
/* Library configuration: these options cannot be changed after
|
|
* the library has been built.
|
|
*/
|
|
/* If pnglibconf.h is missing, you can
|
|
* copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
|
|
*/
|
|
import libpng.pnglibconf;
|
|
|
|
static if (PNG_CONVERT_tIME_SUPPORTED){
|
|
import core.stdc.time;
|
|
}
|
|
|
|
/* Machine specific configuration. */
|
|
public import libpng.pngconf;
|
|
|
|
/*
|
|
* Added at libpng-1.2.8
|
|
*
|
|
* Ref MSDN: Private as priority over Special
|
|
* VS_FF_PRIVATEBUILD File *was not* built using standard release
|
|
* procedures. If this value is given, the StringFileInfo block must
|
|
* contain a PrivateBuild string.
|
|
*
|
|
* VS_FF_SPECIALBUILD File *was* built by the original company using
|
|
* standard release procedures but is a variation of the standard
|
|
* file of the same version number. If this value is given, the
|
|
* StringFileInfo block must contain a SpecialBuild string.
|
|
*/
|
|
|
|
version(PNG_USER_PRIVATEBUILD) {/* From pnglibconf.h */
|
|
enum PNG_LIBPNG_BUILD_TYPE =
|
|
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE);
|
|
}
|
|
else {
|
|
version(PNG_LIBPNG_SPECIALBUILD) {
|
|
enum PNG_LIBPNG_BUILD_TYPE =
|
|
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL);
|
|
}
|
|
else {
|
|
enum PNG_LIBPNG_BUILD_TYPE = (PNG_LIBPNG_BUILD_BASE_TYPE);
|
|
}
|
|
}
|
|
|
|
version(PNG_VERSION_INFO_ONLY) {}
|
|
else {
|
|
|
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
extern (C) {
|
|
|
|
/* Version information for C files, stored in png.c. This had better match
|
|
* the version above.
|
|
*/
|
|
@property auto png_libpng_ver() { return png_get_header_ver(null); }
|
|
|
|
/* This file is arranged in several sections:
|
|
*
|
|
* 1. Any configuration options that can be specified by for the application
|
|
* code when it is built. (Build time configuration is in pnglibconf.h)
|
|
* 2. Type definitions (base types are defined in pngconf.h), structure
|
|
* definitions.
|
|
* 3. Exported library functions.
|
|
*
|
|
* The library source code has additional files (principally pngpriv.h) that
|
|
* allow configuration of the library.
|
|
*/
|
|
/* Section 1: run time configuration
|
|
* See pnglibconf.h for build time configuration
|
|
*
|
|
* Run time configuration allows the application to choose between
|
|
* implementations of certain arithmetic APIs. The default is set
|
|
* at build time and recorded in pnglibconf.h, but it is safe to
|
|
* override these (and only these) settings. Note that this won't
|
|
* change what the library does, only application code, and the
|
|
* settings can (and probably should) be made on a per-file basis
|
|
* by setting the #defines before including png.h
|
|
*
|
|
* Use macros to read integers from PNG data or use the exported
|
|
* functions?
|
|
* PNG_USE_READ_MACROS: use the macros (see below) Note that
|
|
* the macros evaluate their argument multiple times.
|
|
* PNG_NO_USE_READ_MACROS: call the relevant library function.
|
|
*
|
|
* Use the alternative algorithm for compositing alpha samples that
|
|
* does not use division?
|
|
* PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
|
|
* algorithm.
|
|
* PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
|
|
*
|
|
* How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
|
|
* false?
|
|
* PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
|
|
* APIs to png_warning.
|
|
* Otherwise the calls are mapped to png_error.
|
|
*/
|
|
|
|
/* Section 2: type definitions, including structures and compile time
|
|
* constants.
|
|
* See pngconf.h for base types that vary by machine/system
|
|
*/
|
|
|
|
/* This triggers a compiler error in png.c, if png.c and png.h
|
|
* do not agree upon the version number.
|
|
*/
|
|
alias char* png_libpng_version_1_5_14;
|
|
|
|
/* Three color definitions. The order of the red, green, and blue, (and the
|
|
* exact size) is not important, although the size of the fields need to
|
|
* be png_byte or png_uint_16 (as defined below).
|
|
*/
|
|
struct png_color
|
|
{
|
|
png_byte red;
|
|
png_byte green;
|
|
png_byte blue;
|
|
}
|
|
alias png_color * png_colorp;
|
|
alias const(png_color) * png_const_colorp;
|
|
alias png_color * * png_colorpp;
|
|
|
|
struct png_color_16
|
|
{
|
|
png_byte index; /* used for palette files */
|
|
png_uint_16 red; /* for use in red green blue files */
|
|
png_uint_16 green;
|
|
png_uint_16 blue;
|
|
png_uint_16 gray; /* for use in grayscale files */
|
|
}
|
|
alias png_color_16 * png_color_16p;
|
|
alias const(png_color_16) * png_const_color_16p;
|
|
alias png_color_16 * * png_color_16pp;
|
|
|
|
struct png_color_8
|
|
{
|
|
png_byte red; /* for use in red green blue files */
|
|
png_byte green;
|
|
png_byte blue;
|
|
png_byte gray; /* for use in grayscale files */
|
|
png_byte alpha; /* for alpha channel files */
|
|
}
|
|
alias png_color_8 * png_color_8p;
|
|
alias const(png_color_8) * png_const_color_8p;
|
|
alias png_color_8 * * png_color_8pp;
|
|
|
|
/*
|
|
* The following two structures are used for the in-core representation
|
|
* of sPLT chunks.
|
|
*/
|
|
struct png_sPLT_entry
|
|
{
|
|
png_uint_16 red;
|
|
png_uint_16 green;
|
|
png_uint_16 blue;
|
|
png_uint_16 alpha;
|
|
png_uint_16 frequency;
|
|
}
|
|
alias png_sPLT_entry * png_sPLT_entryp;
|
|
alias const(png_sPLT_entry) * png_const_sPLT_entryp;
|
|
alias png_sPLT_entry * * png_sPLT_entrypp;
|
|
|
|
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
|
|
* occupy the LSB of their respective members, and the MSB of each member
|
|
* is zero-filled. The frequency member always occupies the full 16 bits.
|
|
*/
|
|
|
|
struct png_sPLT_t
|
|
{
|
|
png_charp name; /* palette name */
|
|
png_byte depth; /* depth of palette samples */
|
|
png_sPLT_entryp entries; /* palette entries */
|
|
png_int_32 nentries; /* number of palette entries */
|
|
}
|
|
alias png_sPLT_t * png_sPLT_tp;
|
|
alias const(png_sPLT_t) * png_const_sPLT_tp;
|
|
alias png_sPLT_t * * png_sPLT_tpp;
|
|
|
|
static if(PNG_TEXT_SUPPORTED) {
|
|
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
|
|
* and whether that contents is compressed or not. The "key" field
|
|
* points to a regular zero-terminated C string. The "text" fields can be a
|
|
* regular C string, an empty string, or a NULL pointer.
|
|
* However, the structure returned by png_get_text() will always contain
|
|
* the "text" field as a regular zero-terminated C string (possibly
|
|
* empty), never a NULL pointer, so it can be safely used in printf() and
|
|
* other string-handling functions. Note that the "itxt_length", "lang", and
|
|
* "lang_key" members of the structure only exist when the library is built
|
|
* with iTXt chunk support. Prior to libpng-1.4.0 the library was built by
|
|
* default without iTXt support. Also note that when iTXt *is* supported,
|
|
* the "lang" and "lang_key" fields contain NULL pointers when the
|
|
* "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
|
|
* PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
|
|
* same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
|
|
* which is always 0 or 1, or its "compression method" which is always 0.
|
|
*/
|
|
struct png_text
|
|
{
|
|
int compression; /* compression value:
|
|
-1: tEXt, none
|
|
0: zTXt, deflate
|
|
1: iTXt, none
|
|
2: iTXt, deflate */
|
|
png_charp key; /* keyword, 1-79 character description of "text" */
|
|
png_charp text; /* comment, may be an empty string (ie "")
|
|
or a NULL pointer */
|
|
size_t text_length; /* length of the text string */
|
|
size_t itxt_length; /* length of the itxt string */
|
|
png_charp lang; /* language code, 0-79 characters
|
|
or a NULL pointer */
|
|
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
|
|
chars or a NULL pointer */
|
|
}
|
|
alias png_text * png_textp;
|
|
alias const(png_text) * png_const_textp;
|
|
alias png_text * * png_textpp;
|
|
}
|
|
|
|
/* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
|
|
enum PNG_TEXT_COMPRESSION_NONE_WR = -3;
|
|
enum PNG_TEXT_COMPRESSION_zTXt_WR = -2;
|
|
enum PNG_TEXT_COMPRESSION_NONE = -1;
|
|
enum PNG_TEXT_COMPRESSION_zTXt = 0;
|
|
enum PNG_ITXT_COMPRESSION_NONE = 1;
|
|
enum PNG_ITXT_COMPRESSION_zTXt = 2;
|
|
enum PNG_TEXT_COMPRESSION_LAST = 3; /* Not a valid value */
|
|
|
|
/* png_time is a way to hold the time in an machine independent way.
|
|
* Two conversions are provided, both from time_t and struct tm. There
|
|
* is no portable way to convert to either of these structures, as far
|
|
* as I know. If you know of a portable way, send it to me. As a side
|
|
* note - PNG has always been Year 2000 compliant!
|
|
*/
|
|
struct png_time
|
|
{
|
|
png_uint_16 year; /* full year, as in, 1995 */
|
|
png_byte month; /* month of year, 1 - 12 */
|
|
png_byte day; /* day of month, 1 - 31 */
|
|
png_byte hour; /* hour of day, 0 - 23 */
|
|
png_byte minute; /* minute of hour, 0 - 59 */
|
|
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|
}
|
|
alias png_time * png_timep;
|
|
alias const(png_time) * png_const_timep;
|
|
alias png_time * * png_timepp;
|
|
|
|
static if(PNG_UNKNOWN_CHUNKS_SUPPORTED) {//(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|
/* png_unknown_chunk is a structure to hold queued chunks for which there is
|
|
* no specific support. The idea is that we can use this to queue
|
|
* up private chunks for output even though the library doesn't actually
|
|
* know about their semantics.
|
|
*/
|
|
struct png_unknown_chunk
|
|
{
|
|
png_byte name[5];
|
|
png_byte *data;
|
|
size_t size;
|
|
|
|
/* libpng-using applications should NOT directly modify this byte. */
|
|
png_byte location; /* mode of operation at read time */
|
|
}
|
|
alias png_unknown_chunk * png_unknown_chunkp;
|
|
alias const(png_unknown_chunk) * png_const_unknown_chunkp;
|
|
alias png_unknown_chunk * * png_unknown_chunkpp;
|
|
}
|
|
|
|
/* Values for the unknown chunk location byte */
|
|
|
|
enum PNG_HAVE_IHDR = 0x01;
|
|
enum PNG_HAVE_PLTE = 0x02;
|
|
enum PNG_AFTER_IDAT = 0x08;
|
|
|
|
/* The complete definition of png_info has, as of libpng-1.5.0,
|
|
* been moved into a separate header file that is not accessible to
|
|
* applications. Read libpng-manual.txt or libpng.3 for more info.
|
|
*/
|
|
struct png_info{}
|
|
alias png_info * png_infop;
|
|
alias const(png_info) * png_const_infop;
|
|
alias png_info * * png_infopp;
|
|
|
|
/* Maximum positive integer used in PNG is (2^31)-1 */
|
|
enum PNG_UINT_31_MAX = cast(uint)0x7fffffffL;
|
|
enum PNG_UINT_32_MAX = cast(uint)(-1);
|
|
enum PNG_SIZE_MAX = cast(size_t)(-1);
|
|
|
|
/* These are constants for fixed point values encoded in the
|
|
* PNG specification manner (x100000)
|
|
*/
|
|
enum PNG_FP_1 = 100000;
|
|
enum PNG_FP_HALF = 50000;
|
|
enum PNG_FP_MAX = (cast(png_fixed_point)0x7fffffffL);
|
|
enum PNG_FP_MIN = (-PNG_FP_MAX);
|
|
|
|
/* These describe the color_type field in png_info. */
|
|
/* color type masks */
|
|
enum PNG_COLOR_MASK_PALETTE = 1;
|
|
enum PNG_COLOR_MASK_COLOR = 2;
|
|
enum PNG_COLOR_MASK_ALPHA = 4;
|
|
|
|
/* color types. Note that not all combinations are legal */
|
|
enum PNG_COLOR_TYPE_GRAY = 0;
|
|
enum PNG_COLOR_TYPE_PALETTE = (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE);
|
|
enum PNG_COLOR_TYPE_RGB = (PNG_COLOR_MASK_COLOR);
|
|
enum PNG_COLOR_TYPE_RGB_ALPHA = (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA);
|
|
enum PNG_COLOR_TYPE_GRAY_ALPHA = (PNG_COLOR_MASK_ALPHA);
|
|
/* aliases */
|
|
alias PNG_COLOR_TYPE_RGBA = PNG_COLOR_TYPE_RGB_ALPHA;
|
|
alias PNG_COLOR_TYPE_GA = PNG_COLOR_TYPE_GRAY_ALPHA;
|
|
|
|
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
|
|
enum PNG_COMPRESSION_TYPE_BASE = 0; /* Deflate method 8, 32K window */
|
|
alias PNG_COMPRESSION_TYPE_DEFAULT = PNG_COMPRESSION_TYPE_BASE;
|
|
|
|
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
|
|
enum PNG_FILTER_TYPE_BASE = 0; /* Single row per-byte filtering */
|
|
enum PNG_INTRAPIXEL_DIFFERENCING = 64; /* Used only in MNG datastreams */
|
|
alias PNG_FILTER_TYPE_DEFAULT = PNG_FILTER_TYPE_BASE;
|
|
|
|
/* These are for the interlacing type. These values should NOT be changed. */
|
|
enum PNG_INTERLACE_NONE = 0; /* Non-interlaced image */
|
|
enum PNG_INTERLACE_ADAM7 = 1; /* Adam7 interlacing */
|
|
enum PNG_INTERLACE_LAST = 2; /* Not a valid value */
|
|
|
|
/* These are for the oFFs chunk. These values should NOT be changed. */
|
|
enum PNG_OFFSET_PIXEL = 0; /* Offset in pixels */
|
|
enum PNG_OFFSET_MICROMETER = 1; /* Offset in micrometers (1/10^6 meter) */
|
|
enum PNG_OFFSET_LAST = 2; /* Not a valid value */
|
|
|
|
/* These are for the pCAL chunk. These values should NOT be changed. */
|
|
enum PNG_EQUATION_LINEAR = 0; /* Linear transformation */
|
|
enum PNG_EQUATION_BASE_E = 1; /* Exponential base e transform */
|
|
enum PNG_EQUATION_ARBITRARY = 2; /* Arbitrary base exponential transform */
|
|
enum PNG_EQUATION_HYPERBOLIC = 3; /* Hyperbolic sine transformation */
|
|
enum PNG_EQUATION_LAST = 4; /* Not a valid value */
|
|
|
|
/* These are for the sCAL chunk. These values should NOT be changed. */
|
|
enum PNG_SCALE_UNKNOWN = 0; /* unknown unit (image scale) */
|
|
enum PNG_SCALE_METER = 1; /* meters per pixel */
|
|
enum PNG_SCALE_RADIAN = 2; /* radians per pixel */
|
|
enum PNG_SCALE_LAST = 3; /* Not a valid value */
|
|
|
|
/* These are for the pHYs chunk. These values should NOT be changed. */
|
|
enum PNG_RESOLUTION_UNKNOWN = 0; /* pixels/unknown unit (aspect ratio) */
|
|
enum PNG_RESOLUTION_METER = 1; /* pixels/meter */
|
|
enum PNG_RESOLUTION_LAST = 2; /* Not a valid value */
|
|
|
|
/* These are for the sRGB chunk. These values should NOT be changed. */
|
|
enum PNG_sRGB_INTENT_PERCEPTUAL = 0;
|
|
enum PNG_sRGB_INTENT_RELATIVE = 1;
|
|
enum PNG_sRGB_INTENT_SATURATION = 2;
|
|
enum PNG_sRGB_INTENT_ABSOLUTE = 3;
|
|
enum PNG_sRGB_INTENT_LAST = 4; /* Not a valid value */
|
|
|
|
/* This is for text chunks */
|
|
enum PNG_KEYWORD_MAX_LENGTH = 79;
|
|
|
|
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
|
|
enum PNG_MAX_PALETTE_LENGTH = 256;
|
|
|
|
/* These determine if an ancillary chunk's data has been successfully read
|
|
* from the PNG header, or if the application has filled in the corresponding
|
|
* data in the info_struct to be written into the output file. The values
|
|
* of the PNG_INFO_<chunk> defines should NOT be changed.
|
|
*/
|
|
enum PNG_INFO_gAMA = 0x0001;
|
|
enum PNG_INFO_sBIT = 0x0002;
|
|
enum PNG_INFO_cHRM = 0x0004;
|
|
enum PNG_INFO_PLTE = 0x0008;
|
|
enum PNG_INFO_tRNS = 0x0010;
|
|
enum PNG_INFO_bKGD = 0x0020;
|
|
enum PNG_INFO_hIST = 0x0040;
|
|
enum PNG_INFO_pHYs = 0x0080;
|
|
enum PNG_INFO_oFFs = 0x0100;
|
|
enum PNG_INFO_tIME = 0x0200;
|
|
enum PNG_INFO_pCAL = 0x0400;
|
|
enum PNG_INFO_sRGB = 0x0800; /* GR-P, 0.96a */
|
|
enum PNG_INFO_iCCP = 0x1000; /* ESR, 1.0.6 */
|
|
enum PNG_INFO_sPLT = 0x2000; /* ESR, 1.0.6 */
|
|
enum PNG_INFO_sCAL = 0x4000; /* ESR, 1.0.6 */
|
|
enum PNG_INFO_IDAT = 0x8000; /* ESR, 1.0.6 */
|
|
|
|
/* This is used for the transformation routines, as some of them
|
|
* change these values for the row. It also should enable using
|
|
* the routines for other purposes.
|
|
*/
|
|
struct png_row_info
|
|
{
|
|
uint width; /* width of row */
|
|
size_t rowbytes; /* number of bytes in row */
|
|
png_byte color_type; /* color type of row */
|
|
png_byte bit_depth; /* bit depth of row */
|
|
png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|
png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|
}
|
|
|
|
alias png_row_info * png_row_infop;
|
|
alias png_row_info * * png_row_infopp;
|
|
|
|
/* The complete definition of png_struct has, as of libpng-1.5.0,
|
|
* been moved into a separate header file that is not accessible to
|
|
* applications. Read libpng-manual.txt or libpng.3 for more info.
|
|
*/
|
|
struct png_struct {}
|
|
alias const(png_struct) * png_const_structp;
|
|
alias png_struct * png_structp;
|
|
|
|
/* These are the function types for the I/O functions and for the functions
|
|
* that allow the user to override the default I/O functions with his or her
|
|
* own. The png_error_ptr type should match that of user-supplied warning
|
|
* and error functions, while the png_rw_ptr type should match that of the
|
|
* user read/write data functions. Note that the 'write' function must not
|
|
* modify the buffer it is passed. The 'read' function, on the other hand, is
|
|
* expected to return the read data in the buffer.
|
|
*/
|
|
alias void function(png_structp, png_const_charp) png_error_ptr;
|
|
alias void function(png_structp, png_bytep, size_t) png_rw_ptr;
|
|
alias void function(png_structp) png_flush_ptr;
|
|
alias void function(png_structp, uint, int) png_read_status_ptr;
|
|
alias void function(png_structp, uint, int) png_write_status_ptr;
|
|
|
|
static if(PNG_PROGRESSIVE_READ_SUPPORTED) {
|
|
alias void function(png_structp, png_infop) png_progressive_info_ptr;
|
|
alias void function(png_structp, png_infop) png_progressive_end_ptr;
|
|
|
|
/* The following callback receives uint row_number, int pass for the
|
|
* png_bytep data of the row. When transforming an interlaced image the
|
|
* row number is the row number within the sub-image of the interlace pass, so
|
|
* the value will increase to the height of the sub-image (not the full image)
|
|
* then reset to 0 for the next pass.
|
|
*
|
|
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
|
|
* find the output pixel (x,y) given an interlaced sub-image pixel
|
|
* (row,col,pass). (See below for these macros.)
|
|
*/
|
|
alias void function(png_structp, png_bytep, uint, int) png_progressive_row_ptr;
|
|
}
|
|
|
|
static if(PNG_READ_USER_TRANSFORM_SUPPORTED || PNG_WRITE_USER_TRANSFORM_SUPPORTED){
|
|
alias void function(png_structp, png_row_infop, png_bytep) png_user_transform_ptr;
|
|
}
|
|
|
|
static if(PNG_USER_CHUNKS_SUPPORTED) {
|
|
alias int function(png_structp, png_unknown_chunkp) png_user_chunk_ptr;
|
|
}
|
|
static if(PNG_UNKNOWN_CHUNKS_SUPPORTED) {
|
|
alias void function(png_structp) png_unknown_chunk_ptr;
|
|
}
|
|
|
|
static if(PNG_SETJMP_SUPPORTED) {
|
|
/* This must match the function definition in <setjmp.h>, and the application
|
|
* must include this before png.h to obtain the definition of jmp_buf. The
|
|
* function is required, but this is not checked. If the
|
|
* function does return the application will crash via an abort() or similar
|
|
* system level call.
|
|
*
|
|
* If you get a warning here while building the library you may need to make
|
|
* changes to ensure that pnglibconf.h records the calling convention used by
|
|
* your compiler. This may be very difficult - try using a different compiler
|
|
* to build the library!
|
|
*/
|
|
//alias void function(PNGARG((jmp_buf, int)), alias) png_longjmp_ptr;
|
|
}
|
|
|
|
/* Transform masks for the high-level interface */
|
|
enum PNG_TRANSFORM_IDENTITY = 0x0000; /* read and write */
|
|
enum PNG_TRANSFORM_STRIP_16 = 0x0001; /* read only */
|
|
enum PNG_TRANSFORM_STRIP_ALPHA = 0x0002; /* read only */
|
|
enum PNG_TRANSFORM_PACKING = 0x0004; /* read and write */
|
|
enum PNG_TRANSFORM_PACKSWAP = 0x0008; /* read and write */
|
|
enum PNG_TRANSFORM_EXPAND = 0x0010; /* read only */
|
|
enum PNG_TRANSFORM_INVERT_MONO = 0x0020; /* read and write */
|
|
enum PNG_TRANSFORM_SHIFT = 0x0040; /* read and write */
|
|
enum PNG_TRANSFORM_BGR = 0x0080; /* read and write */
|
|
enum PNG_TRANSFORM_SWAP_ALPHA = 0x0100; /* read and write */
|
|
enum PNG_TRANSFORM_SWAP_ENDIAN = 0x0200; /* read and write */
|
|
enum PNG_TRANSFORM_INVERT_ALPHA = 0x0400; /* read and write */
|
|
enum PNG_TRANSFORM_STRIP_FILLER = 0x0800; /* write only */
|
|
/* Added to libpng-1.2.34 */
|
|
alias PNG_TRANSFORM_STRIP_FILLER_BEFORE = PNG_TRANSFORM_STRIP_FILLER;
|
|
enum PNG_TRANSFORM_STRIP_FILLER_AFTER = 0x1000; /* write only */
|
|
/* Added to libpng-1.4.0 */
|
|
enum PNG_TRANSFORM_GRAY_TO_RGB = 0x2000; /* read only */
|
|
/* Added to libpng-1.5.4 */
|
|
enum PNG_TRANSFORM_EXPAND_16 = 0x4000; /* read only */
|
|
enum PNG_TRANSFORM_SCALE_16 = 0x8000; /* read only */
|
|
|
|
/* Flags for MNG supported features */
|
|
enum PNG_FLAG_MNG_EMPTY_PLTE = 0x01;
|
|
enum PNG_FLAG_MNG_FILTER_64 = 0x04;
|
|
enum PNG_ALL_MNG_FEATURES = 0x05;
|
|
|
|
/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
|
|
* this allowed the zlib default functions to be used on Windows
|
|
* platforms. In 1.5 the zlib default malloc (which just calls malloc and
|
|
* ignores the first argument) should be completely compatible with the
|
|
* following.
|
|
*/
|
|
alias png_voidp function(png_structp, png_alloc_size_t) png_malloc_ptr;
|
|
alias void function(png_structp, png_voidp) png_free_ptr;
|
|
|
|
alias png_struct * * png_structpp;
|
|
|
|
/* Section 3: exported functions
|
|
* Here are the function definitions most commonly used. This is not
|
|
* the place to find out how to use libpng. See libpng-manual.txt for the
|
|
* full explanation, see example.c for the summary. This just provides
|
|
* a simple one line description of the use of each function.
|
|
*
|
|
* The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
|
|
* pngconf.h and in the *.dfn files in the scripts directory.
|
|
*
|
|
* PNG_EXPORT(ordinal, type, name, (args);
|
|
*
|
|
* ordinal: ordinal that is used while building
|
|
* *.def files. The ordinal value is only
|
|
* relevant when preprocessing png.h with
|
|
* the *.dfn files for building symbol table
|
|
* entries, and are removed by pngconf.h.
|
|
* type: return type of the function
|
|
* name: function name
|
|
* args: function arguments, with types
|
|
*
|
|
* When we wish to append attributes to a function prototype we use
|
|
* the PNG_EXPORTA() macro instead.
|
|
*
|
|
* PNG_EXPORTA(ordinal, type, name, (args), attributes);
|
|
*
|
|
* ordinal, type, name, and args: same as in PNG_EXPORT().
|
|
* attributes: function attributes
|
|
*/
|
|
|
|
/* Returns the version number of the library */
|
|
uint png_access_version_number();
|
|
|
|
/* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|
* Handling more than 8 bytes from the beginning of the file is an error.
|
|
*/
|
|
void png_set_sig_bytes(png_structp png_ptr, int num_bytes);
|
|
|
|
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|
* signature, and non-zero otherwise. Having num_to_check == 0 or
|
|
* start > 7 will always fail (ie return non-zero).
|
|
*/
|
|
int png_sig_cmp(png_const_bytep sig, size_t start,
|
|
size_t num_to_check);
|
|
|
|
/* Simple signature checking function. This is the same as calling
|
|
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
|
|
*/
|
|
auto png_check_sig(S,N)(S sig, N n) { return !png_sig_cmp((sig), 0, (n)); }
|
|
|
|
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|
extern(C)
|
|
png_structp png_create_read_struct
|
|
(png_const_charp user_png_ver, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn);
|
|
|
|
/* Allocate and initialize png_ptr struct for writing, and any other memory */
|
|
png_structp png_create_write_struct
|
|
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
png_error_ptr warn_fn);
|
|
|
|
size_t png_get_compression_buffer_size
|
|
(png_const_structp png_ptr);
|
|
|
|
void png_set_compression_buffer_size(png_structp png_ptr,
|
|
size_t size);
|
|
|
|
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
|
|
* match up.
|
|
*/
|
|
static if(PNG_SETJMP_SUPPORTED){
|
|
/* This function returns the jmp_buf built in to *png_ptr. It must be
|
|
* supplied with an appropriate 'longjmp' function to use on that jmp_buf
|
|
* unless the default error function is overridden in which case NULL is
|
|
* acceptable. The size of the jmp_buf is checked against the actual size
|
|
* allocated by the library - the call will return NULL on a mismatch
|
|
* indicating an ABI mismatch.
|
|
*/
|
|
//jmp_buf* png_set_longjmp_fn(png_structp png_ptr,
|
|
// png_longjmp_ptr longjmp_fn, size_t jmp_buf_size);
|
|
//# define png_jmpbuf(png_ptr) \
|
|
// (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
|
|
}else{
|
|
//# define png_jmpbuf(png_ptr) \
|
|
// (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
|
|
}
|
|
/* This function should be used by libpng applications in place of
|
|
* longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it
|
|
* will use it; otherwise it will call PNG_ABORT(). This function was
|
|
* added in libpng-1.5.0.
|
|
*/
|
|
void png_longjmp(png_structp png_ptr, int val);
|
|
|
|
static if(PNG_READ_SUPPORTED){
|
|
/* Reset the compression stream */
|
|
int png_reset_zstream(png_structp png_ptr);
|
|
}
|
|
|
|
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
|
|
static if(PNG_USER_MEM_SUPPORTED){
|
|
png_structp png_create_read_struct_2
|
|
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
png_error_ptr warn_fn,
|
|
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn);
|
|
png_structp png_create_write_struct_2
|
|
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
|
|
png_error_ptr warn_fn,
|
|
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn);
|
|
}
|
|
|
|
/* Write the PNG file signature. */
|
|
void png_write_sig(png_structp png_ptr);
|
|
|
|
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|
void png_write_chunk(png_structp png_ptr, png_const_bytep
|
|
chunk_name, png_const_bytep data, size_t length);
|
|
|
|
/* Write the start of a PNG chunk - length and chunk name. */
|
|
void png_write_chunk_start(png_structp png_ptr,
|
|
png_const_bytep chunk_name, uint length);
|
|
|
|
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|
void png_write_chunk_data(png_structp png_ptr,
|
|
png_const_bytep data, size_t length);
|
|
|
|
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|
void png_write_chunk_end(png_structp png_ptr);
|
|
|
|
/* Allocate and initialize the info structure */
|
|
png_infop png_create_info_struct(png_structp png_ptr);
|
|
|
|
void png_info_init_3(png_infopp info_ptr,
|
|
size_t png_info_struct_size);
|
|
|
|
/* Writes all the PNG information before the image. */
|
|
void png_write_info_before_PLTE
|
|
(png_structp png_ptr, png_infop info_ptr);
|
|
void png_write_info
|
|
(png_structp png_ptr, png_infop info_ptr);
|
|
|
|
static if(PNG_SEQUENTIAL_READ_SUPPORTED){
|
|
/* Read the information before the actual image data. */
|
|
void png_read_info
|
|
(png_structp png_ptr, png_infop info_ptr);
|
|
}
|
|
|
|
static if(PNG_TIME_RFC1123_SUPPORTED){
|
|
png_const_charp png_convert_to_rfc1123
|
|
(png_structp png_ptr,
|
|
png_const_timep ptime);
|
|
}
|
|
|
|
static if(PNG_CONVERT_tIME_SUPPORTED){
|
|
/* Convert from a struct tm to png_time */
|
|
void png_convert_from_struct_tm(png_timep ptime,
|
|
const(tm) * ttime);
|
|
|
|
/* Convert from time_t to png_time. Uses gmtime() */
|
|
void png_convert_from_time_t
|
|
(png_timep ptime, time_t ttime);
|
|
} /* PNG_CONVERT_tIME_SUPPORTED */
|
|
|
|
static if(PNG_READ_EXPAND_SUPPORTED){
|
|
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
|
|
void png_set_expand(png_structp png_ptr);
|
|
void png_set_expand_gray_1_2_4_to_8(png_structp png_ptr);
|
|
void png_set_palette_to_rgb(png_structp png_ptr);
|
|
void png_set_tRNS_to_alpha(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_EXPAND_16_SUPPORTED){
|
|
/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
|
|
* of a tRNS chunk if present.
|
|
*/
|
|
void png_set_expand_16(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED){
|
|
/* Use blue, green, red order for pixels. */
|
|
void png_set_bgr(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_GRAY_TO_RGB_SUPPORTED){
|
|
/* Expand the grayscale to 24-bit RGB if necessary. */
|
|
void png_set_gray_to_rgb(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_RGB_TO_GRAY_SUPPORTED){
|
|
/* Reduce RGB to grayscale. */
|
|
enum PNG_ERROR_ACTION_NONE = 1;
|
|
enum PNG_ERROR_ACTION_WARN = 2;
|
|
enum PNG_ERROR_ACTION_ERROR = 3;
|
|
enum PNG_RGB_TO_GRAY_DEFAULT = (-1);/*for red/green coefficients*/
|
|
|
|
void png_set_rgb_to_gray(png_structp png_ptr,
|
|
int error_action, double red, double green);
|
|
void png_set_rgb_to_gray_fixed(png_structp png_ptr,
|
|
int error_action, png_fixed_point red, png_fixed_point green);
|
|
|
|
png_byte png_get_rgb_to_gray_status(png_const_structp
|
|
png_ptr);
|
|
}
|
|
|
|
static if(PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED){
|
|
void png_build_grayscale_palette(int bit_depth,
|
|
png_colorp palette);
|
|
}
|
|
|
|
static if(PNG_READ_ALPHA_MODE_SUPPORTED){
|
|
/* How the alpha channel is interpreted - this affects how the color channels of
|
|
* a PNG file are returned when an alpha channel, or tRNS chunk in a palette
|
|
* file, is present.
|
|
*
|
|
* This has no effect on the way pixels are written into a PNG output
|
|
* datastream. The color samples in a PNG datastream are never premultiplied
|
|
* with the alpha samples.
|
|
*
|
|
* The default is to return data according to the PNG specification: the alpha
|
|
* channel is a linear measure of the contribution of the pixel to the
|
|
* corresponding composited pixel. The gamma encoded color channels must be
|
|
* scaled according to the contribution and to do this it is necessary to undo
|
|
* the encoding, scale the color values, perform the composition and reencode
|
|
* the values. This is the 'PNG' mode.
|
|
*
|
|
* The alternative is to 'associate' the alpha with the color information by
|
|
* storing color channel values that have been scaled by the alpha. The
|
|
* advantage is that the color channels can be resampled (the image can be
|
|
* scaled) in this form. The disadvantage is that normal practice is to store
|
|
* linear, not (gamma) encoded, values and this requires 16-bit channels for
|
|
* still images rather than the 8-bit channels that are just about sufficient if
|
|
* gamma encoding is used. In addition all non-transparent pixel values,
|
|
* including completely opaque ones, must be gamma encoded to produce the final
|
|
* image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
|
|
* latter being the two common names for associated alpha color channels.)
|
|
*
|
|
* Since it is not necessary to perform arithmetic on opaque color values so
|
|
* long as they are not to be resampled and are in the final color space it is
|
|
* possible to optimize the handling of alpha by storing the opaque pixels in
|
|
* the PNG format (adjusted for the output color space) while storing partially
|
|
* opaque pixels in the standard, linear, format. The accuracy required for
|
|
* standard alpha composition is relatively low, because the pixels are
|
|
* isolated, therefore typically the accuracy loss in storing 8-bit linear
|
|
* values is acceptable. (This is not true if the alpha channel is used to
|
|
* simulate transparency over large areas - use 16 bits or the PNG mode in
|
|
* this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is
|
|
* treated as opaque only if the alpha value is equal to the maximum value.
|
|
*
|
|
* The final choice is to gamma encode the alpha channel as well. This is
|
|
* broken because, in practice, no implementation that uses this choice
|
|
* correctly undoes the encoding before handling alpha composition. Use this
|
|
* choice only if other serious errors in the software or hardware you use
|
|
* mandate it; the typical serious error is for dark halos to appear around
|
|
* opaque areas of the composited PNG image because of arithmetic overflow.
|
|
*
|
|
* The API function png_set_alpha_mode specifies which of these choices to use
|
|
* with an enumerated 'mode' value and the gamma of the required output:
|
|
*/
|
|
enum PNG_ALPHA_PNG = 0; /* according to the PNG standard */
|
|
enum PNG_ALPHA_STANDARD = 1; /* according to Porter/Duff */
|
|
enum PNG_ALPHA_ASSOCIATED = 1; /* as above; this is the normal practice */
|
|
enum PNG_ALPHA_PREMULTIPLIED = 1; /* as above */
|
|
enum PNG_ALPHA_OPTIMIZED = 2; /* 'PNG' for opaque pixels, else 'STANDARD' */
|
|
enum PNG_ALPHA_BROKEN = 3; /* the alpha channel is gamma encoded */
|
|
|
|
void png_set_alpha_mode(png_structp png_ptr, int mode,
|
|
double output_gamma);
|
|
void png_set_alpha_mode_fixed(png_structp png_ptr,
|
|
int mode, png_fixed_point output_gamma);
|
|
}
|
|
|
|
static if(PNG_READ_GAMMA_SUPPORTED || PNG_READ_ALPHA_MODE_SUPPORTED){
|
|
/* The output_gamma value is a screen gamma in libpng terminology: it expresses
|
|
* how to decode the output values, not how they are encoded. The values used
|
|
* correspond to the normal numbers used to describe the overall gamma of a
|
|
* computer display system; for example 2.2 for an sRGB conformant system. The
|
|
* values are scaled by 100000 in the _fixed version of the API (so 220000 for
|
|
* sRGB.)
|
|
*
|
|
* The inverse of the value is always used to provide a default for the PNG file
|
|
* encoding if it has no gAMA chunk and if png_set_gamma() has not been called
|
|
* to override the PNG gamma information.
|
|
*
|
|
* When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
|
|
* opaque pixels however pixels with lower alpha values are not encoded,
|
|
* regardless of the output gamma setting.
|
|
*
|
|
* When the standard Porter Duff handling is requested with mode 1 the output
|
|
* encoding is set to be linear and the output_gamma value is only relevant
|
|
* as a default for input data that has no gamma information. The linear output
|
|
* encoding will be overridden if png_set_gamma() is called - the results may be
|
|
* highly unexpected!
|
|
*
|
|
* The following numbers are derived from the sRGB standard and the research
|
|
* behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of
|
|
* 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing
|
|
* correction required to take account of any differences in the color
|
|
* environment of the original scene and the intended display environment; the
|
|
* value expresses how to *decode* the image for display, not how the original
|
|
* data was *encoded*.
|
|
*
|
|
* sRGB provides a peg for the PNG standard by defining a viewing environment.
|
|
* sRGB itself, and earlier TV standards, actually use a more complex transform
|
|
* (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is
|
|
* limited to simple power laws.) By saying that an image for direct display on
|
|
* an sRGB conformant system should be stored with a gAMA chunk value of 45455
|
|
* (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
|
|
* makes it possible to derive values for other display systems and
|
|
* environments.
|
|
*
|
|
* The Mac value is deduced from the sRGB based on an assumption that the actual
|
|
* extra viewing correction used in early Mac display systems was implemented as
|
|
* a power 1.45 lookup table.
|
|
*
|
|
* Any system where a programmable lookup table is used or where the behavior of
|
|
* the final display device characteristics can be changed requires system
|
|
* specific code to obtain the current characteristic. However this can be
|
|
* difficult and most PNG gamma correction only requires an approximate value.
|
|
*
|
|
* By default, if png_set_alpha_mode() is not called, libpng assumes that all
|
|
* values are unencoded, linear, values and that the output device also has a
|
|
* linear characteristic. This is only very rarely correct - it is invariably
|
|
* better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
|
|
* default if you don't know what the right answer is!
|
|
*
|
|
* The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
|
|
* 10.6) which used a correction table to implement a somewhat lower gamma on an
|
|
* otherwise sRGB system.
|
|
*
|
|
* Both these values are reserved (not simple gamma values) in order to allow
|
|
* more precise correction internally in the future.
|
|
*
|
|
* NOTE: the following values can be passed to either the fixed or floating
|
|
* point APIs, but the floating point API will also accept floating point
|
|
* values.
|
|
*/
|
|
enum PNG_DEFAULT_sRGB = -1; /* sRGB gamma and color space */
|
|
enum PNG_GAMMA_MAC_18 = -2; /* Old Mac '1.8' gamma and color space */
|
|
enum PNG_GAMMA_sRGB = 220000; /* Television standards--matches sRGB gamma */
|
|
alias PNG_GAMMA_LINEAR = PNG_FP_1; /* Linear */
|
|
}
|
|
|
|
/* The following are examples of calls to png_set_alpha_mode to achieve the
|
|
* required overall gamma correction and, where necessary, alpha
|
|
* premultiplication.
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
|
|
* This is the default libpng handling of the alpha channel - it is not
|
|
* pre-multiplied into the color components. In addition the call states
|
|
* that the output is for a sRGB system and causes all PNG files without gAMA
|
|
* chunks to be assumed to be encoded using sRGB.
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
|
|
* In this case the output is assumed to be something like an sRGB conformant
|
|
* display preceeded by a power-law lookup table of power 1.45. This is how
|
|
* early Mac systems behaved.
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
|
|
* This is the classic Jim Blinn approach and will work in academic
|
|
* environments where everything is done by the book. It has the shortcoming
|
|
* of assuming that input PNG data with no gamma information is linear - this
|
|
* is unlikely to be correct unless the PNG files where generated locally.
|
|
* Most of the time the output precision will be so low as to show
|
|
* significant banding in dark areas of the image.
|
|
*
|
|
* png_set_expand_16(pp);
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
|
|
* This is a somewhat more realistic Jim Blinn inspired approach. PNG files
|
|
* are assumed to have the sRGB encoding if not marked with a gamma value and
|
|
* the output is always 16 bits per component. This permits accurate scaling
|
|
* and processing of the data. If you know that your input PNG files were
|
|
* generated locally you might need to replace PNG_DEFAULT_sRGB with the
|
|
* correct value for your system.
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
|
|
* If you just need to composite the PNG image onto an existing background
|
|
* and if you control the code that does this you can use the optimization
|
|
* setting. In this case you just copy completely opaque pixels to the
|
|
* output. For pixels that are not completely transparent (you just skip
|
|
* those) you do the composition math using png_composite or png_composite_16
|
|
* below then encode the resultant 8-bit or 16-bit values to match the output
|
|
* encoding.
|
|
*
|
|
* Other cases
|
|
* If neither the PNG nor the standard linear encoding work for you because
|
|
* of the software or hardware you use then you have a big problem. The PNG
|
|
* case will probably result in halos around the image. The linear encoding
|
|
* will probably result in a washed out, too bright, image (it's actually too
|
|
* contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably
|
|
* substantially reduce the halos. Alternatively try:
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
|
|
* This option will also reduce the halos, but there will be slight dark
|
|
* halos round the opaque parts of the image where the background is light.
|
|
* In the OPTIMIZED mode the halos will be light halos where the background
|
|
* is dark. Take your pick - the halos are unavoidable unless you can get
|
|
* your hardware/software fixed! (The OPTIMIZED approach is slightly
|
|
* faster.)
|
|
*
|
|
* When the default gamma of PNG files doesn't match the output gamma.
|
|
* If you have PNG files with no gamma information png_set_alpha_mode allows
|
|
* you to provide a default gamma, but it also sets the ouput gamma to the
|
|
* matching value. If you know your PNG files have a gamma that doesn't
|
|
* match the output you can take advantage of the fact that
|
|
* png_set_alpha_mode always sets the output gamma but only sets the PNG
|
|
* default if it is not already set:
|
|
*
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
|
|
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
|
|
* The first call sets both the default and the output gamma values, the
|
|
* second call overrides the output gamma without changing the default. This
|
|
* is easier than achieving the same effect with png_set_gamma. You must use
|
|
* PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
|
|
* fire if more than one call to png_set_alpha_mode and png_set_background is
|
|
* made in the same read operation, however multiple calls with PNG_ALPHA_PNG
|
|
* are ignored.
|
|
*/
|
|
|
|
static if(PNG_READ_STRIP_ALPHA_SUPPORTED){
|
|
void png_set_strip_alpha(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED){
|
|
void png_set_swap_alpha(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED){
|
|
void png_set_invert_alpha(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED){
|
|
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
|
|
void png_set_filler(png_structp png_ptr, uint filler,
|
|
int flags);
|
|
/* The values of the PNG_FILLER_ defines should NOT be changed */
|
|
enum PNG_FILLER_BEFORE = 0;
|
|
enum PNG_FILLER_AFTER = 1;
|
|
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
|
|
void png_set_add_alpha
|
|
(png_structp png_ptr, uint filler,
|
|
int flags);
|
|
} /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|
|
|
static if(PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED){
|
|
/* Swap bytes in 16-bit depth files. */
|
|
void png_set_swap(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED){
|
|
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
|
|
void png_set_packing(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPORTED){
|
|
/* Swap packing order of pixels in bytes. */
|
|
void png_set_packswap(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED){
|
|
/* Converts files to legal bit depths. */
|
|
void png_set_shift(png_structp png_ptr, png_const_color_8p
|
|
true_bits);
|
|
}
|
|
|
|
static if(PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED){
|
|
/* Have the code handle the interlacing. Returns the number of passes.
|
|
* MUST be called before png_read_update_info or png_start_read_image,
|
|
* otherwise it will not have the desired effect. Note that it is still
|
|
* necessary to call png_read_row or png_read_rows png_get_image_height
|
|
* times for each pass.
|
|
*/
|
|
int png_set_interlace_handling(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED){
|
|
/* Invert monochrome files */
|
|
void png_set_invert_mono(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_BACKGROUND_SUPPORTED){
|
|
/* Handle alpha and tRNS by replacing with a background color. Prior to
|
|
* libpng-1.5.4 this API must not be called before the PNG file header has been
|
|
* read. Doing so will result in unexpected behavior and possible warnings or
|
|
* errors if the PNG file contains a bKGD chunk.
|
|
*/
|
|
void png_set_background(png_structp png_ptr,
|
|
png_const_color_16p background_color, int background_gamma_code,
|
|
int need_expand, double background_gamma);
|
|
void png_set_background_fixed (png_structp png_ptr,
|
|
png_const_color_16p background_color, int background_gamma_code,
|
|
int need_expand, png_fixed_point background_gamma);
|
|
}
|
|
static if(PNG_READ_BACKGROUND_SUPPORTED){
|
|
enum PNG_BACKGROUND_GAMMA_UNKNOWN = 0;
|
|
enum PNG_BACKGROUND_GAMMA_SCREEN = 1;
|
|
enum PNG_BACKGROUND_GAMMA_FILE = 2;
|
|
enum PNG_BACKGROUND_GAMMA_UNIQUE = 3;
|
|
}
|
|
|
|
static if(PNG_READ_SCALE_16_TO_8_SUPPORTED){
|
|
/* Scale a 16-bit depth file down to 8-bit, accurately. */
|
|
void png_set_scale_16(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_STRIP_16_TO_8_SUPPORTED){
|
|
//alias PNG_READ_16_TO_8 = SUPPORTED; /* Name prior to 1.5.4 */
|
|
/* Strip the second byte of information from a 16-bit depth file. */
|
|
void png_set_strip_16(png_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_QUANTIZE_SUPPORTED){
|
|
/* Turn on quantizing, and reduce the palette to the number of colors
|
|
* available.
|
|
*/
|
|
void png_set_quantize
|
|
(png_structp png_ptr, png_colorp palette,
|
|
int num_palette, int maximum_colors, png_const_uint_16p histogram,
|
|
int full_quantize);
|
|
}
|
|
|
|
static if(PNG_READ_GAMMA_SUPPORTED){
|
|
/* The threshold on gamma processing is configurable but hard-wired into the
|
|
* library. The following is the floating point variant.
|
|
*/
|
|
enum PNG_GAMMA_THRESHOLD = (PNG_GAMMA_THRESHOLD_FIXED*0.00001);
|
|
|
|
/* Handle gamma correction. Screen_gamma=(display_exponent).
|
|
* NOTE: this API simply sets the screen and file gamma values. It will
|
|
* therefore override the value for gamma in a PNG file if it is called after
|
|
* the file header has been read - use with care - call before reading the PNG
|
|
* file for best results!
|
|
*
|
|
* These routines accept the same gamma values as png_set_alpha_mode (described
|
|
* above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
|
|
* API (floating point or fixed.) Notice, however, that the 'file_gamma' value
|
|
* is the inverse of a 'screen gamma' value.
|
|
*/
|
|
void png_set_gamma
|
|
(png_structp png_ptr, double screen_gamma,
|
|
double override_file_gamma);
|
|
void png_set_gamma_fixed(png_structp png_ptr,
|
|
png_fixed_point screen_gamma, png_fixed_point override_file_gamma);
|
|
}
|
|
|
|
static if(PNG_WRITE_FLUSH_SUPPORTED){
|
|
/* Set how many lines between output flushes - 0 for no flushing */
|
|
void png_set_flush(png_structp png_ptr, int nrows);
|
|
/* Flush the current PNG output buffer */
|
|
void png_write_flush(png_structp png_ptr);
|
|
}
|
|
|
|
/* Optional update palette with requested transformations */
|
|
void png_start_read_image(png_structp png_ptr);
|
|
|
|
/* Optional call to update the users info structure */
|
|
void png_read_update_info
|
|
(png_structp png_ptr, png_infop info_ptr);
|
|
|
|
static if(PNG_SEQUENTIAL_READ_SUPPORTED){
|
|
/* Read one or more rows of image data. */
|
|
void png_read_rows(png_structp png_ptr, png_bytepp row,
|
|
png_bytepp display_row, uint num_rows);
|
|
}
|
|
|
|
static if(PNG_SEQUENTIAL_READ_SUPPORTED){
|
|
/* Read a row of data. */
|
|
void png_read_row(png_structp png_ptr, png_bytep row,
|
|
png_bytep display_row);
|
|
}
|
|
|
|
static if(PNG_SEQUENTIAL_READ_SUPPORTED){
|
|
/* Read the whole image into memory at once. */
|
|
void png_read_image(png_structp png_ptr, png_bytepp image);
|
|
}
|
|
|
|
/* Write a row of image data */
|
|
void png_write_row
|
|
(png_structp png_ptr, png_const_bytep row);
|
|
|
|
/* Write a few rows of image data: (*row) is not written; however, the type
|
|
* is declared as writeable to maintain compatibility with previous versions
|
|
* of libpng and to allow the 'display_row' array from read_rows to be passed
|
|
* unchanged to write_rows.
|
|
*/
|
|
void png_write_rows(png_structp png_ptr, in png_bytepp row,
|
|
uint num_rows);
|
|
|
|
/* Write the image data */
|
|
void png_write_image
|
|
(png_structp png_ptr, in png_bytepp image);
|
|
|
|
/* Write the end of the PNG file. */
|
|
void png_write_end
|
|
(png_structp png_ptr, png_infop info_ptr);
|
|
|
|
static if(PNG_SEQUENTIAL_READ_SUPPORTED){
|
|
/* Read the end of the PNG file. */
|
|
void png_read_end(png_structp png_ptr, png_infop info_ptr);
|
|
}
|
|
|
|
/* Free any memory associated with the png_info_struct */
|
|
void png_destroy_info_struct(png_structp png_ptr,
|
|
png_infopp info_ptr_ptr);
|
|
|
|
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
void png_destroy_read_struct(png_structpp png_ptr_ptr,
|
|
png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr);
|
|
|
|
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
void png_destroy_write_struct(png_structpp png_ptr_ptr,
|
|
png_infopp info_ptr_ptr);
|
|
|
|
/* Set the libpng method of handling chunk CRC errors */
|
|
void png_set_crc_action
|
|
(png_structp png_ptr, int crit_action, int ancil_action);
|
|
|
|
/* Values for png_set_crc_action() say how to handle CRC errors in
|
|
* ancillary and critical chunks, and whether to use the data contained
|
|
* therein. Note that it is impossible to "discard" data in a critical
|
|
* chunk. For versions prior to 0.90, the action was always error/quit,
|
|
* whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|
* chunks is warn/discard. These values should NOT be changed.
|
|
*
|
|
* value action:critical action:ancillary
|
|
*/
|
|
enum PNG_CRC_DEFAULT = 0; /* error/quit warn/discard data */
|
|
enum PNG_CRC_ERROR_QUIT = 1; /* error/quit error/quit */
|
|
enum PNG_CRC_WARN_DISCARD = 2; /* (INVALID) warn/discard data */
|
|
enum PNG_CRC_WARN_USE = 3; /* warn/use data warn/use data */
|
|
enum PNG_CRC_QUIET_USE = 4; /* quiet/use data quiet/use data */
|
|
enum PNG_CRC_NO_CHANGE = 5; /* use current value use current value */
|
|
|
|
/* These functions give the user control over the scan-line filtering in
|
|
* libpng and the compression methods used by zlib. These functions are
|
|
* mainly useful for testing, as the defaults should work with most users.
|
|
* Those users who are tight on memory or want faster performance at the
|
|
* expense of compression can modify them. See the compression library
|
|
* header file (zlib.h) for an explination of the compression functions.
|
|
*/
|
|
|
|
/* Set the filtering method(s) used by libpng. Currently, the only valid
|
|
* value for "method" is 0.
|
|
*/
|
|
void png_set_filter
|
|
(png_structp png_ptr, int method, int filters);
|
|
|
|
/* Flags for png_set_filter() to say which filters to use. The flags
|
|
* are chosen so that they don't conflict with real filter types
|
|
* below, in case they are supplied instead of the #defined constants.
|
|
* These values should NOT be changed.
|
|
*/
|
|
enum PNG_NO_FILTERS = 0x00;
|
|
enum PNG_FILTER_NONE = 0x08;
|
|
enum PNG_FILTER_SUB = 0x10;
|
|
enum PNG_FILTER_UP = 0x20;
|
|
enum PNG_FILTER_AVG = 0x40;
|
|
enum PNG_FILTER_PAETH = 0x80;
|
|
enum PNG_ALL_FILTERS = (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP |
|
|
PNG_FILTER_AVG | PNG_FILTER_PAETH);
|
|
|
|
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|
* These defines should NOT be changed.
|
|
*/
|
|
enum PNG_FILTER_VALUE_NONE = 0;
|
|
enum PNG_FILTER_VALUE_SUB = 1;
|
|
enum PNG_FILTER_VALUE_UP = 2;
|
|
enum PNG_FILTER_VALUE_AVG = 3;
|
|
enum PNG_FILTER_VALUE_PAETH = 4;
|
|
enum PNG_FILTER_VALUE_LAST = 5;
|
|
|
|
static if(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED){ /* EXPERIMENTAL */
|
|
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|
* defines, either the default (minimum-sum-of-absolute-differences), or
|
|
* the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|
*
|
|
* Weights are factors >= 1.0, indicating how important it is to keep the
|
|
* filter type consistent between rows. Larger numbers mean the current
|
|
* filter is that many times as likely to be the same as the "num_weights"
|
|
* previous filters. This is cumulative for each previous row with a weight.
|
|
* There needs to be "num_weights" values in "filter_weights", or it can be
|
|
* NULL if the weights aren't being specified. Weights have no influence on
|
|
* the selection of the first row filter. Well chosen weights can (in theory)
|
|
* improve the compression for a given image.
|
|
*
|
|
* Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|
* filter type. Higher costs indicate more decoding expense, and are
|
|
* therefore less likely to be selected over a filter with lower computational
|
|
* costs. There needs to be a value in "filter_costs" for each valid filter
|
|
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|
* setting the costs. Costs try to improve the speed of decompression without
|
|
* unduly increasing the compressed image size.
|
|
*
|
|
* A negative weight or cost indicates the default value is to be used, and
|
|
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|
* The default values for both weights and costs are currently 1.0, but may
|
|
* change if good general weighting/cost heuristics can be found. If both
|
|
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|
* to the UNWEIGHTED method, but with added encoding time/computation.
|
|
*/
|
|
void png_set_filter_heuristics(png_structp png_ptr,
|
|
int heuristic_method, int num_weights, png_const_doublep filter_weights,
|
|
png_const_doublep filter_costs);
|
|
void png_set_filter_heuristics_fixed
|
|
(png_structp png_ptr,
|
|
int heuristic_method, int num_weights, png_const_fixed_point_p
|
|
filter_weights, png_const_fixed_point_p filter_costs);
|
|
} /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
|
|
/* Heuristic used for row filter selection. These defines should NOT be
|
|
* changed.
|
|
*/
|
|
enum PNG_FILTER_HEURISTIC_DEFAULT = 0; /* Currently "UNWEIGHTED" */
|
|
enum PNG_FILTER_HEURISTIC_UNWEIGHTED = 1; /* Used by libpng < 0.95 */
|
|
enum PNG_FILTER_HEURISTIC_WEIGHTED = 2; /* Experimental feature */
|
|
enum PNG_FILTER_HEURISTIC_LAST = 3; /* Not a valid value */
|
|
|
|
static if(PNG_WRITE_SUPPORTED){
|
|
/* Set the library compression level. Currently, valid values range from
|
|
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|
* (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|
* shown that zlib compression levels 3-6 usually perform as well as level 9
|
|
* for PNG images, and do considerably fewer caclulations. In the future,
|
|
* these values may not correspond directly to the zlib compression levels.
|
|
*/
|
|
void png_set_compression_level
|
|
(png_structp png_ptr, int level);
|
|
|
|
void png_set_compression_mem_level(png_structp png_ptr,
|
|
int mem_level);
|
|
|
|
void png_set_compression_strategy(png_structp png_ptr,
|
|
int strategy);
|
|
|
|
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
* smaller value of window_bits if it can do so safely.
|
|
*/
|
|
void png_set_compression_window_bits(png_structp png_ptr,
|
|
int window_bits);
|
|
|
|
void png_set_compression_method(png_structp png_ptr,
|
|
int method);
|
|
}
|
|
|
|
static if(PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED){
|
|
/* Also set zlib parameters for compressing non-IDAT chunks */
|
|
void png_set_text_compression_level
|
|
(png_structp png_ptr, int level);
|
|
|
|
void png_set_text_compression_mem_level(png_structp png_ptr,
|
|
int mem_level);
|
|
|
|
void png_set_text_compression_strategy(png_structp png_ptr,
|
|
int strategy);
|
|
|
|
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
* smaller value of window_bits if it can do so safely.
|
|
*/
|
|
void png_set_text_compression_window_bits(png_structp
|
|
png_ptr, int window_bits);
|
|
|
|
void png_set_text_compression_method(png_structp png_ptr,
|
|
int method);
|
|
} /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
|
|
|
|
/* These next functions are called for input/output, memory, and error
|
|
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|
* and call standard C I/O routines such as fread(), fwrite(), and
|
|
* fprintf(). These functions can be made to use other I/O routines
|
|
* at run time for those applications that need to handle I/O in a
|
|
* different manner by calling png_set_???_fn(). See libpng-manual.txt for
|
|
* more information.
|
|
*/
|
|
|
|
static if(PNG_STDIO_SUPPORTED){
|
|
/* Initialize the input/output for the PNG file to the default functions. */
|
|
void png_init_io(png_structp png_ptr, png_FILE_p fp);
|
|
}
|
|
|
|
/* Replace the (error and abort), and warning functions with user
|
|
* supplied functions. If no messages are to be printed you must still
|
|
* write and use replacement functions. The replacement error_fn should
|
|
* still do a longjmp to the last setjmp location if you are using this
|
|
* method of error handling. If error_fn or warning_fn is NULL, the
|
|
* default function will be used.
|
|
*/
|
|
|
|
void png_set_error_fn
|
|
(png_structp png_ptr, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warning_fn);
|
|
|
|
/* Return the user pointer associated with the error functions */
|
|
png_voidp png_get_error_ptr(png_const_structp png_ptr);
|
|
|
|
/* Replace the default data output functions with a user supplied one(s).
|
|
* If buffered output is not used, then output_flush_fn can be set to NULL.
|
|
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|
* output_flush_fn will be ignored (and thus can be NULL).
|
|
* It is probably a mistake to use NULL for output_flush_fn if
|
|
* write_data_fn is not also NULL unless you have built libpng with
|
|
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
|
|
* default flush function, which uses the standard *FILE structure, will
|
|
* be used.
|
|
*/
|
|
void png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
|
|
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn);
|
|
|
|
/* Replace the default data input function with a user supplied one. */
|
|
void png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
|
|
png_rw_ptr read_data_fn);
|
|
|
|
/* Return the user pointer associated with the I/O functions */
|
|
png_voidp png_get_io_ptr(png_structp png_ptr);
|
|
|
|
void png_set_read_status_fn(png_structp png_ptr,
|
|
png_read_status_ptr read_row_fn);
|
|
|
|
void png_set_write_status_fn(png_structp png_ptr,
|
|
png_write_status_ptr write_row_fn);
|
|
|
|
static if(PNG_USER_MEM_SUPPORTED){
|
|
/* Replace the default memory allocation functions with user supplied one(s). */
|
|
void png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr,
|
|
png_malloc_ptr malloc_fn, png_free_ptr free_fn);
|
|
/* Return the user pointer associated with the memory functions */
|
|
png_voidp png_get_mem_ptr(png_const_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_READ_USER_TRANSFORM_SUPPORTED){
|
|
void png_set_read_user_transform_fn(png_structp png_ptr,
|
|
png_user_transform_ptr read_user_transform_fn);
|
|
}
|
|
|
|
static if(PNG_WRITE_USER_TRANSFORM_SUPPORTED){
|
|
void png_set_write_user_transform_fn(png_structp png_ptr,
|
|
png_user_transform_ptr write_user_transform_fn);
|
|
}
|
|
|
|
static if(PNG_USER_TRANSFORM_PTR_SUPPORTED){
|
|
void png_set_user_transform_info(png_structp png_ptr,
|
|
png_voidp user_transform_ptr, int user_transform_depth,
|
|
int user_transform_channels);
|
|
/* Return the user pointer associated with the user transform functions */
|
|
png_voidp png_get_user_transform_ptr
|
|
(png_const_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_USER_TRANSFORM_INFO_SUPPORTED){
|
|
/* Return information about the row currently being processed. Note that these
|
|
* APIs do not fail but will return unexpected results if called outside a user
|
|
* transform callback. Also note that when transforming an interlaced image the
|
|
* row number is the row number within the sub-image of the interlace pass, so
|
|
* the value will increase to the height of the sub-image (not the full image)
|
|
* then reset to 0 for the next pass.
|
|
*
|
|
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
|
|
* find the output pixel (x,y) given an interlaced sub-image pixel
|
|
* (row,col,pass). (See below for these macros.)
|
|
*/
|
|
uint png_get_current_row_number(png_const_structp);
|
|
png_byte png_get_current_pass_number(png_const_structp);
|
|
}
|
|
|
|
static if(PNG_USER_CHUNKS_SUPPORTED){
|
|
void png_set_read_user_chunk_fn(png_structp png_ptr,
|
|
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn);
|
|
png_voidp png_get_user_chunk_ptr(png_const_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_PROGRESSIVE_READ_SUPPORTED){
|
|
/* Sets the function callbacks for the push reader, and a pointer to a
|
|
* user-defined structure available to the callback functions.
|
|
*/
|
|
void png_set_progressive_read_fn(png_structp png_ptr,
|
|
png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
|
|
png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn);
|
|
|
|
/* Returns the user pointer associated with the push read functions */
|
|
png_voidp png_get_progressive_ptr(png_const_structp png_ptr);
|
|
|
|
/* Function to be called when data becomes available */
|
|
void png_process_data
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_bytep buffer, size_t buffer_size);
|
|
|
|
/* A function which may be called *only* within png_process_data to stop the
|
|
* processing of any more data. The function returns the number of bytes
|
|
* remaining, excluding any that libpng has cached internally. A subsequent
|
|
* call to png_process_data must supply these bytes again. If the argument
|
|
* 'save' is set to true the routine will first save all the pending data and
|
|
* will always return 0.
|
|
*/
|
|
size_t png_process_data_pause(png_structp, int save);
|
|
|
|
/* A function which may be called *only* outside (after) a call to
|
|
* png_process_data. It returns the number of bytes of data to skip in the
|
|
* input. Normally it will return 0, but if it returns a non-zero value the
|
|
* application must skip than number of bytes of input data and pass the
|
|
* following data to the next call to png_process_data.
|
|
*/
|
|
uint png_process_data_skip(png_structp);
|
|
|
|
static if(PNG_READ_INTERLACING_SUPPORTED){
|
|
/* Function that combines rows. 'new_row' is a flag that should come from
|
|
* the callback and be non-NULL if anything needs to be done; the library
|
|
* stores its own version of the new data internally and ignores the passed
|
|
* in value.
|
|
*/
|
|
void png_progressive_combine_row(png_structp png_ptr,
|
|
png_bytep old_row, png_const_bytep new_row);
|
|
} /* PNG_READ_INTERLACING_SUPPORTED */
|
|
} /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
png_voidp png_malloc
|
|
(png_structp png_ptr, png_alloc_size_t size);
|
|
/* Added at libpng version 1.4.0 */
|
|
png_voidp png_calloc
|
|
(png_structp png_ptr, png_alloc_size_t size);
|
|
|
|
/* Added at libpng version 1.2.4 */
|
|
png_voidp png_malloc_warn(png_structp png_ptr,
|
|
png_alloc_size_t size);
|
|
|
|
/* Frees a pointer allocated by png_malloc() */
|
|
void png_free(png_structp png_ptr, png_voidp ptr);
|
|
|
|
/* Free data that was allocated internally */
|
|
void png_free_data
|
|
(png_structp png_ptr, png_infop info_ptr, uint free_me, int num);
|
|
|
|
/* Reassign responsibility for freeing existing data, whether allocated
|
|
* by libpng or by the application */
|
|
void png_data_freer
|
|
(png_structp png_ptr, png_infop info_ptr, int freer, uint mask);
|
|
|
|
/* Assignments for png_data_freer */
|
|
enum PNG_DESTROY_WILL_FREE_DATA = 1;
|
|
enum PNG_SET_WILL_FREE_DATA = 1;
|
|
enum PNG_USER_WILL_FREE_DATA = 2;
|
|
/* Flags for png_ptr->free_me and info_ptr->free_me */
|
|
enum PNG_FREE_HIST = 0x0008;
|
|
enum PNG_FREE_ICCP = 0x0010;
|
|
enum PNG_FREE_SPLT = 0x0020;
|
|
enum PNG_FREE_ROWS = 0x0040;
|
|
enum PNG_FREE_PCAL = 0x0080;
|
|
enum PNG_FREE_SCAL = 0x0100;
|
|
enum PNG_FREE_UNKN = 0x0200;
|
|
enum PNG_FREE_LIST = 0x0400;
|
|
enum PNG_FREE_PLTE = 0x1000;
|
|
enum PNG_FREE_TRNS = 0x2000;
|
|
enum PNG_FREE_TEXT = 0x4000;
|
|
enum PNG_FREE_ALL = 0x7fff;
|
|
enum PNG_FREE_MUL = 0x4220; /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
|
|
|
|
static if(PNG_USER_MEM_SUPPORTED){
|
|
png_voidp png_malloc_default(png_structp png_ptr,
|
|
png_alloc_size_t size);
|
|
void png_free_default(png_structp png_ptr, png_voidp ptr);
|
|
}
|
|
|
|
static if(PNG_ERROR_TEXT_SUPPORTED){
|
|
/* Fatal error in PNG image of libpng - can't continue */
|
|
void png_error
|
|
(png_structp png_ptr, png_const_charp error_message);
|
|
|
|
/* The same, but the chunk name is prepended to the error string. */
|
|
void png_chunk_error(png_structp png_ptr,
|
|
png_const_charp error_mes);
|
|
|
|
}else{
|
|
/* Fatal error in PNG image of libpng - can't continue */
|
|
void png_err(png_structp png);
|
|
}
|
|
|
|
static if(PNG_WARNINGS_SUPPORTED){
|
|
/* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|
void png_warning(png_structp png_ptr,
|
|
png_const_charp warning_message);
|
|
|
|
/* Non-fatal error in libpng, chunk name is prepended to message. */
|
|
void png_chunk_warning(png_structp png_ptr,
|
|
png_const_charp warning_message);
|
|
}
|
|
|
|
static if(PNG_BENIGN_ERRORS_SUPPORTED){
|
|
/* Benign error in libpng. Can continue, but may have a problem.
|
|
* User can choose whether to handle as a fatal error or as a warning. */
|
|
//# undef png_benign_error
|
|
void png_benign_error(png_structp png_ptr,
|
|
png_const_charp warning_message);
|
|
|
|
/* Same, chunk name is prepended to message. */
|
|
//# undef png_chunk_benign_error
|
|
void png_chunk_benign_error(png_structp png_ptr,
|
|
png_const_charp warning_message);
|
|
|
|
void png_set_benign_errors
|
|
(png_structp png_ptr, int allowed);
|
|
}else{
|
|
version(PNG_ALLOW_BENIGN_ERRORS){
|
|
alias png_benign_error = png_warning;
|
|
alias png_chunk_benign_error = png_chunk_warning;
|
|
}else{
|
|
alias png_benign_error = png_error;
|
|
alias png_chunk_benign_error = png_chunk_error;
|
|
}
|
|
}
|
|
|
|
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|
* Similarly, the png_get_<chunk> calls are used to read values from the
|
|
* png_info_struct, either storing the parameters in the passed variables, or
|
|
* setting pointers into the png_info_struct where the data is stored. The
|
|
* png_get_<chunk> functions return a non-zero value if the data was available
|
|
* in info_ptr, or return zero and do not change any of the parameters if the
|
|
* data was not available.
|
|
*
|
|
* These functions should be used instead of directly accessing png_info
|
|
* to avoid problems with future changes in the size and internal layout of
|
|
* png_info_struct.
|
|
*/
|
|
/* Returns "flag" if chunk data is valid in info_ptr. */
|
|
uint png_get_valid
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
uint flag);
|
|
|
|
/* Returns number of bytes needed to hold a transformed row. */
|
|
size_t png_get_rowbytes(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
static if(PNG_INFO_IMAGE_SUPPORTED){
|
|
/* Returns row_pointers, which is an array of pointers to scanlines that was
|
|
* returned from png_read_png().
|
|
*/
|
|
png_bytepp png_get_rows
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
/* Set row_pointers, which is an array of pointers to scanlines for use
|
|
* by png_write_png().
|
|
*/
|
|
void png_set_rows(png_structp png_ptr,
|
|
png_infop info_ptr, png_bytepp row_pointers);
|
|
}
|
|
|
|
/* Returns number of color channels in image. */
|
|
png_byte png_get_channels
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
static if(PNG_EASY_ACCESS_SUPPORTED){
|
|
/* Returns image width in pixels. */
|
|
uint png_get_image_width(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image height in pixels. */
|
|
uint png_get_image_height(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image bit_depth. */
|
|
png_byte png_get_bit_depth
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
/* Returns image color_type. */
|
|
png_byte png_get_color_type(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image filter_type. */
|
|
png_byte png_get_filter_type(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image interlace_type. */
|
|
png_byte png_get_interlace_type(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image compression_type. */
|
|
png_byte png_get_compression_type(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
|
|
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
|
|
uint png_get_pixels_per_meter
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
uint png_get_x_pixels_per_meter
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
uint png_get_y_pixels_per_meter
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
|
|
float png_get_pixel_aspect_ratio
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
png_fixed_point png_get_pixel_aspect_ratio_fixed
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
|
|
png_int_32 png_get_x_offset_pixels
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
png_int_32 png_get_y_offset_pixels
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
png_int_32 png_get_x_offset_microns
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
png_int_32 png_get_y_offset_microns
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
} /* PNG_EASY_ACCESS_SUPPORTED */
|
|
|
|
/* Returns pointer to signature string read from PNG header */
|
|
png_const_bytep png_get_signature
|
|
(png_const_structp png_ptr, png_infop info_ptr);
|
|
|
|
static if(PNG_bKGD_SUPPORTED){
|
|
uint png_get_bKGD
|
|
(png_const_structp png_ptr, png_infop info_ptr,
|
|
png_color_16p *background);
|
|
}
|
|
|
|
static if(PNG_bKGD_SUPPORTED){
|
|
void png_set_bKGD(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_color_16p background);
|
|
}
|
|
|
|
static if(PNG_cHRM_SUPPORTED){
|
|
png_uint_32 png_get_cHRM(png_const_structp png_ptr,
|
|
png_const_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|
double *red_y, double *green_x, double *green_y, double *blue_x,
|
|
double *blue_y);
|
|
png_uint_32 png_get_cHRM_XYZ(png_structp png_ptr,
|
|
png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z,
|
|
double *green_X, double *green_Y, double *green_Z, double *blue_X,
|
|
double *blue_Y, double *blue_Z);
|
|
static if(PNG_FIXED_POINT_SUPPORTED){ /* Otherwise not implemented */
|
|
uint png_get_cHRM_fixed
|
|
(png_const_structp png_ptr,
|
|
png_const_infop info_ptr, png_fixed_point *int_white_x,
|
|
png_fixed_point *int_white_y, png_fixed_point *int_red_x,
|
|
png_fixed_point *int_red_y, png_fixed_point *int_green_x,
|
|
png_fixed_point *int_green_y, png_fixed_point *int_blue_x,
|
|
png_fixed_point *int_blue_y);
|
|
}
|
|
uint png_get_cHRM_XYZ_fixed
|
|
(png_structp png_ptr, png_const_infop info_ptr,
|
|
png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
|
|
png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
|
|
png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
|
|
png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
|
|
png_fixed_point *int_blue_Z);
|
|
}
|
|
|
|
static if(PNG_cHRM_SUPPORTED){
|
|
void png_set_cHRM
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
double white_x, double white_y, double red_x, double red_y, double green_x,
|
|
double green_y, double blue_x, double blue_y);
|
|
void png_set_cHRM_XYZ(png_structp png_ptr,
|
|
png_infop info_ptr, double red_X, double red_Y, double red_Z,
|
|
double green_X, double green_Y, double green_Z, double blue_X,
|
|
double blue_Y, double blue_Z);
|
|
void png_set_cHRM_fixed(png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point int_white_x,
|
|
png_fixed_point int_white_y, png_fixed_point int_red_x,
|
|
png_fixed_point int_red_y, png_fixed_point int_green_x,
|
|
png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
png_fixed_point int_blue_y);
|
|
void png_set_cHRM_XYZ_fixed(png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
|
|
png_fixed_point int_red_Z, png_fixed_point int_green_X,
|
|
png_fixed_point int_green_Y, png_fixed_point int_green_Z,
|
|
png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
|
|
png_fixed_point int_blue_Z);
|
|
}
|
|
|
|
static if(PNG_gAMA_SUPPORTED){
|
|
png_uint_32 png_get_gAMA
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
double *file_gamma);
|
|
uint png_get_gAMA_fixed
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_fixed_point *int_file_gamma);
|
|
}
|
|
|
|
static if(PNG_gAMA_SUPPORTED){
|
|
void png_set_gAMA(png_structp png_ptr,
|
|
png_infop info_ptr, double file_gamma);
|
|
void png_set_gAMA_fixed(png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point int_file_gamma);
|
|
}
|
|
|
|
static if(PNG_hIST_SUPPORTED){
|
|
uint png_get_hIST
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_uint_16p *hist);
|
|
}
|
|
|
|
static if(PNG_hIST_SUPPORTED){
|
|
void png_set_hIST(png_structp png_ptr,
|
|
png_infop info_ptr, png_const_uint_16p hist);
|
|
}
|
|
|
|
uint png_get_IHDR
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
uint *width, uint *height, int *bit_depth, int *color_type,
|
|
int *interlace_method, int *compression_method, int *filter_method);
|
|
|
|
void png_set_IHDR
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
uint width, uint height, int bit_depth, int color_type,
|
|
int interlace_method, int compression_method, int filter_method);
|
|
|
|
static if(PNG_oFFs_SUPPORTED){
|
|
uint png_get_oFFs
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type);
|
|
}
|
|
|
|
static if(PNG_oFFs_SUPPORTED){
|
|
void png_set_oFFs
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_int_32 offset_x, png_int_32 offset_y, int unit_type);
|
|
}
|
|
|
|
static if(PNG_pCAL_SUPPORTED){
|
|
uint png_get_pCAL
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type,
|
|
int *nparams,
|
|
png_charp *units, png_charpp *params);
|
|
}
|
|
|
|
static if(PNG_pCAL_SUPPORTED){
|
|
void png_set_pCAL(png_structp png_ptr,
|
|
png_infop info_ptr,
|
|
png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
|
|
int nparams, png_const_charp units, png_charpp params);
|
|
}
|
|
|
|
static if(PNG_pHYs_SUPPORTED){
|
|
uint png_get_pHYs
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
uint *res_x, uint *res_y, int *unit_type);
|
|
}
|
|
|
|
static if(PNG_pHYs_SUPPORTED){
|
|
void png_set_pHYs
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
uint res_x, uint res_y, int unit_type);
|
|
}
|
|
|
|
uint png_get_PLTE
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_colorp *palette, int *num_palette);
|
|
|
|
void png_set_PLTE
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_colorp palette, int num_palette);
|
|
|
|
static if(PNG_sBIT_SUPPORTED){
|
|
uint png_get_sBIT
|
|
(png_const_structp png_ptr, png_infop info_ptr,
|
|
png_color_8p *sig_bit);
|
|
}
|
|
|
|
static if(PNG_sBIT_SUPPORTED){
|
|
void png_set_sBIT
|
|
(png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit);
|
|
}
|
|
|
|
static if(PNG_sRGB_SUPPORTED){
|
|
uint png_get_sRGB(png_const_structp png_ptr,
|
|
png_const_infop info_ptr, int *file_srgb_intent);
|
|
}
|
|
|
|
static if(PNG_sRGB_SUPPORTED){
|
|
void png_set_sRGB
|
|
(png_structp png_ptr, png_infop info_ptr, int srgb_intent);
|
|
void png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr,
|
|
png_infop info_ptr, int srgb_intent);
|
|
}
|
|
|
|
static if(PNG_iCCP_SUPPORTED){
|
|
uint png_get_iCCP
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_charpp name, int *compression_type, png_bytepp profile,
|
|
uint *proflen);
|
|
}
|
|
|
|
static if(PNG_iCCP_SUPPORTED){
|
|
void png_set_iCCP
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_charp name, int compression_type, png_const_bytep profile,
|
|
uint proflen);
|
|
}
|
|
|
|
static if(PNG_sPLT_SUPPORTED){
|
|
uint png_get_sPLT
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_sPLT_tpp entries);
|
|
}
|
|
|
|
static if(PNG_sPLT_SUPPORTED){
|
|
void png_set_sPLT
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_sPLT_tp entries, int nentries);
|
|
}
|
|
|
|
static if(PNG_TEXT_SUPPORTED){
|
|
/* png_get_text also returns the number of text chunks in *num_text */
|
|
uint png_get_text
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
png_textp *text_ptr, int *num_text);
|
|
}
|
|
|
|
/* Note while png_set_text() will accept a structure whose text,
|
|
* language, and translated keywords are NULL pointers, the structure
|
|
* returned by png_get_text will always contain regular
|
|
* zero-terminated C strings. They might be empty strings but
|
|
* they will never be NULL pointers.
|
|
*/
|
|
|
|
static if(PNG_TEXT_SUPPORTED){
|
|
void png_set_text
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_textp text_ptr, int num_text);
|
|
}
|
|
|
|
static if(PNG_tIME_SUPPORTED){
|
|
uint png_get_tIME
|
|
(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time);
|
|
}
|
|
|
|
static if(PNG_tIME_SUPPORTED){
|
|
void png_set_tIME
|
|
(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time);
|
|
}
|
|
|
|
static if(PNG_tRNS_SUPPORTED){
|
|
uint png_get_tRNS
|
|
(png_const_structp png_ptr, png_infop info_ptr,
|
|
png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color);
|
|
}
|
|
|
|
static if(PNG_tRNS_SUPPORTED){
|
|
void png_set_tRNS
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
png_const_bytep trans_alpha, int num_trans,
|
|
png_const_color_16p trans_color);
|
|
}
|
|
|
|
static if(PNG_sCAL_SUPPORTED){
|
|
png_uint_32 png_get_sCAL
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
int *unit, double *width, double *height);
|
|
static if(PNG_FLOATING_ARITHMETIC_SUPPORTED){
|
|
/* NOTE: this API is currently implemented using floating point arithmetic,
|
|
* consequently it can only be used on systems with floating point support.
|
|
* In any case the range of values supported by png_fixed_point is small and it
|
|
* is highly recommended that png_get_sCAL_s be used instead.
|
|
*/
|
|
uint png_get_sCAL_fixed
|
|
(png_structp png_ptr, png_const_infop info_ptr, int *unit,
|
|
png_fixed_point *width,
|
|
png_fixed_point *height);
|
|
}
|
|
uint png_get_sCAL_s
|
|
(png_const_structp png_ptr, png_const_infop info_ptr,
|
|
int *unit, png_charpp swidth, png_charpp sheight);
|
|
|
|
void png_set_sCAL
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
int unit, double width, double height);
|
|
void png_set_sCAL_fixed (png_structp png_ptr,
|
|
png_infop info_ptr, int unit, png_fixed_point width,
|
|
png_fixed_point height);
|
|
void png_set_sCAL_s
|
|
(png_structp png_ptr, png_infop info_ptr,
|
|
int unit, png_const_charp swidth, png_const_charp sheight);
|
|
} /* PNG_sCAL_SUPPORTED */
|
|
|
|
static if(PNG_HANDLE_AS_UNKNOWN_SUPPORTED){
|
|
/* Provide a list of chunks and how they are to be handled, if the built-in
|
|
handling or default unknown chunk handling is not desired. Any chunks not
|
|
listed will be handled in the default manner. The IHDR and IEND chunks
|
|
must not be listed. Because this turns off the default handling for chunks
|
|
that would otherwise be recognized the behavior of libpng transformations may
|
|
well become incorrect!
|
|
keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior
|
|
= 1: PNG_HANDLE_CHUNK_NEVER: do not keep
|
|
= 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy
|
|
= 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy
|
|
*/
|
|
void png_set_keep_unknown_chunks
|
|
(png_structp png_ptr, int keep,
|
|
png_const_bytep chunk_list, int num_chunks);
|
|
|
|
/* The handling code is returned; the result is therefore true (non-zero) if
|
|
* special handling is required, false for the default handling.
|
|
*/
|
|
int png_handle_as_unknown(png_structp png_ptr,
|
|
png_const_bytep chunk_name);
|
|
}
|
|
static if(PNG_UNKNOWN_CHUNKS_SUPPORTED){
|
|
void png_set_unknown_chunks(png_structp png_ptr,
|
|
png_infop info_ptr, png_const_unknown_chunkp unknowns,
|
|
int num_unknowns);
|
|
void png_set_unknown_chunk_location
|
|
(png_structp png_ptr, png_infop info_ptr, int chunk, int location);
|
|
int png_get_unknown_chunks(png_const_structp png_ptr,
|
|
png_const_infop info_ptr, png_unknown_chunkpp entries);
|
|
}
|
|
|
|
/* Png_free_data() will turn off the "valid" flag for anything it frees.
|
|
* If you need to turn it off for a chunk that your application has freed,
|
|
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
|
|
*/
|
|
void png_set_invalid
|
|
(png_structp png_ptr, png_infop info_ptr, int mask);
|
|
|
|
static if(PNG_INFO_IMAGE_SUPPORTED){
|
|
/* The "params" pointer is currently not used and is for future expansion. */
|
|
void png_read_png(png_structp png_ptr, png_infop info_ptr,
|
|
int transforms, png_voidp params);
|
|
void png_write_png(png_structp png_ptr, png_infop info_ptr,
|
|
int transforms, png_voidp params);
|
|
}
|
|
|
|
png_const_charp png_get_copyright
|
|
(png_const_structp png_ptr);
|
|
png_const_charp png_get_header_ver
|
|
(png_const_structp png_ptr);
|
|
png_const_charp png_get_header_version
|
|
(png_const_structp png_ptr);
|
|
png_const_charp png_get_libpng_ver
|
|
(png_const_structp png_ptr);
|
|
|
|
static if(PNG_MNG_FEATURES_SUPPORTED){
|
|
uint png_permit_mng_features(png_structp png_ptr,
|
|
uint mng_features_permitted);
|
|
}
|
|
|
|
/* For use in png_set_keep_unknown, added to version 1.2.6 */
|
|
enum PNG_HANDLE_CHUNK_AS_DEFAULT = 0;
|
|
enum PNG_HANDLE_CHUNK_NEVER = 1;
|
|
enum PNG_HANDLE_CHUNK_IF_SAFE = 2;
|
|
enum PNG_HANDLE_CHUNK_ALWAYS = 3;
|
|
|
|
/* Strip the prepended error numbers ("#nnn ") from error and warning
|
|
* messages before passing them to the error or warning handler.
|
|
*/
|
|
static if(PNG_ERROR_NUMBERS_SUPPORTED){
|
|
void png_set_strip_error_numbers
|
|
(png_structp png_ptr,
|
|
uint strip_mode);
|
|
}
|
|
|
|
/* Added in libpng-1.2.6 */
|
|
static if(PNG_SET_USER_LIMITS_SUPPORTED){
|
|
void png_set_user_limits(png_structp png_ptr,
|
|
uint user_width_max, uint user_height_max);
|
|
uint png_get_user_width_max
|
|
(png_const_structp png_ptr);
|
|
uint png_get_user_height_max
|
|
(png_const_structp png_ptr);
|
|
/* Added in libpng-1.4.0 */
|
|
void png_set_chunk_cache_max(png_structp png_ptr,
|
|
uint user_chunk_cache_max);
|
|
uint png_get_chunk_cache_max
|
|
(png_const_structp png_ptr);
|
|
/* Added in libpng-1.4.1 */
|
|
void png_set_chunk_malloc_max(png_structp png_ptr,
|
|
png_alloc_size_t user_chunk_cache_max);
|
|
png_alloc_size_t png_get_chunk_malloc_max
|
|
(png_const_structp png_ptr);
|
|
}
|
|
|
|
static if(PNG_INCH_CONVERSIONS_SUPPORTED){
|
|
uint png_get_pixels_per_inch
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
uint png_get_x_pixels_per_inch
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
uint png_get_y_pixels_per_inch
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
|
|
float png_get_x_offset_inches
|
|
(png_const_structp png_ptr, png_const_infop info_ptr);
|
|
static if(PNG_FIXED_POINT_SUPPORTED){ /* otherwise not implemented. */
|
|
png_fixed_point png_get_x_offset_inches_fixed
|
|
(png_structp png_ptr, png_const_infop info_ptr);
|
|
}
|
|
|
|
float png_get_y_offset_inches(png_const_structp png_ptr,
|
|
png_const_infop info_ptr);
|
|
static if(PNG_FIXED_POINT_SUPPORTED){ /* otherwise not implemented. */
|
|
png_fixed_point png_get_y_offset_inches_fixed
|
|
(png_structp png_ptr, png_const_infop info_ptr);
|
|
}
|
|
|
|
static if(PNG_pHYs_SUPPORTED){
|
|
uint png_get_pHYs_dpi(png_const_structp png_ptr,
|
|
png_const_infop info_ptr, uint *res_x, uint *res_y,
|
|
int *unit_type);
|
|
} /* PNG_pHYs_SUPPORTED */
|
|
} /* PNG_INCH_CONVERSIONS_SUPPORTED */
|
|
|
|
/* Added in libpng-1.4.0 */
|
|
static if(PNG_IO_STATE_SUPPORTED){
|
|
uint png_get_io_state(png_structp png_ptr);
|
|
|
|
png_const_bytep png_get_io_chunk_name
|
|
(png_structp png_ptr);
|
|
uint png_get_io_chunk_type
|
|
(png_const_structp png_ptr);
|
|
|
|
/* The flags returned by png_get_io_state() are the following: */
|
|
enum PNG_IO_NONE = 0x0000; /* no I/O at this moment */
|
|
enum PNG_IO_READING = 0x0001; /* currently reading */
|
|
enum PNG_IO_WRITING = 0x0002; /* currently writing */
|
|
enum PNG_IO_SIGNATURE = 0x0010; /* currently at the file signature */
|
|
enum PNG_IO_CHUNK_HDR = 0x0020; /* currently at the chunk header */
|
|
enum PNG_IO_CHUNK_DATA = 0x0040; /* currently at the chunk data */
|
|
enum PNG_IO_CHUNK_CRC = 0x0080; /* currently at the chunk crc */
|
|
enum PNG_IO_MASK_OP = 0x000f; /* current operation: reading/writing */
|
|
enum PNG_IO_MASK_LOC = 0x00f0; /* current location: sig/hdr/data/crc */
|
|
} /* ?PNG_IO_STATE_SUPPORTED */
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|
|
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/* Interlace support. The following macros are always defined so that if
|
|
* libpng interlace handling is turned off the macros may be used to handle
|
|
* interlaced images within the application.
|
|
*/
|
|
enum PNG_INTERLACE_ADAM7_PASSES = 7;
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|
|
|
/* Two macros to return the first row and first column of the original,
|
|
* full, image which appears in a given pass. 'pass' is in the range 0
|
|
* to 6 and the result is in the range 0 to 7.
|
|
*/
|
|
auto PNG_PASS_START_ROW(T)(T pass) { return (((1&~(pass))<<(3-((pass)>>1)))&7); }
|
|
auto PNG_PASS_START_COL(T)(T pass) { return (((1& (pass))<<(3-(((pass)+1)>>1)))&7); }
|
|
|
|
/* A macro to return the offset between pixels in the output row for a pair of
|
|
* pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
|
|
* follows. Note that ROW_OFFSET is the offset from one row to the next whereas
|
|
* COL_OFFSET is from one column to the next, within a row.
|
|
*/
|
|
auto PNG_PASS_ROW_OFFSET(T)(T pass) { return ((pass)>2?(8>>(((pass)-1)>>1)):8); }
|
|
auto PNG_PASS_COL_OFFSET(T)(T pass) { return (1<<((7-(pass))>>1)); }
|
|
|
|
/* Two macros to help evaluate the number of rows or columns in each
|
|
* pass. This is expressed as a shift - effectively log2 of the number or
|
|
* rows or columns in each 8x8 tile of the original image.
|
|
*/
|
|
auto PNG_PASS_ROW_SHIFT(T)(T pass) { return ((pass)>2?(8-(pass))>>1:3); }
|
|
auto PNG_PASS_COL_SHIFT(T)(T pass) { return ((pass)>1?(7-(pass))>>1:3); }
|
|
|
|
/* Hence two macros to determine the number of rows or columns in a given
|
|
* pass of an image given its height or width. In fact these macros may
|
|
* return non-zero even though the sub-image is empty, because the other
|
|
* dimension may be empty for a small image.
|
|
*/
|
|
auto PNG_PASS_ROWS(S,T)(S height, T pass) { return (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))
|
|
-1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)); }
|
|
auto PNG_PASS_COLS(S,T)(S width, T pass) { return (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))
|
|
-1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)); }
|
|
|
|
/* For the reader row callbacks (both progressive and sequential) it is
|
|
* necessary to find the row in the output image given a row in an interlaced
|
|
* image, so two more macros:
|
|
*/
|
|
auto PNG_ROW_FROM_PASS_ROW(S,T)(S yIn, T pass) { return
|
|
(((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)); }
|
|
auto PNG_COL_FROM_PASS_COL(S,T)(S xIn, T pass) { return
|
|
(((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)); }
|
|
|
|
/* Two macros which return a boolean (0 or 1) saying whether the given row
|
|
* or column is in a particular pass. These use a common utility macro that
|
|
* returns a mask for a given pass - the offset 'off' selects the row or
|
|
* column version. The mask has the appropriate bit set for each column in
|
|
* the tile.
|
|
*/
|
|
auto PNG_PASS_MASK(S,T)(S pass,T off) { return (
|
|
((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) |
|
|
((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)); }
|
|
|
|
auto PNG_ROW_IN_INTERLACE_PASS(T)(y, pass) { return
|
|
((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1); }
|
|
auto PNG_COL_IN_INTERLACE_PASS(T)(x, pass) { return
|
|
((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1); }
|
|
|
|
static if(PNG_READ_COMPOSITE_NODIV_SUPPORTED){
|
|
/* With these routines we avoid an integer divide, which will be slower on
|
|
* most machines. However, it does take more operations than the corresponding
|
|
* divide method, so it may be slower on a few RISC systems. There are two
|
|
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
|
*
|
|
* Note that the rounding factors are NOT supposed to be the same! 128 and
|
|
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
|
* standard method.
|
|
*
|
|
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
|
*/
|
|
|
|
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
|
|
|
static assert(0);
|
|
|
|
}else{ /* Standard method using integer division */
|
|
|
|
auto png_composite(T)(out T composite, png_uint_16 fg, png_uint_16 alpha, png_uint_16 bg) {
|
|
return (composite) = cast(png_byte)(((fg) * (alpha) +
|
|
(bg) * (255 - (alpha)) +
|
|
127) / 255); }
|
|
|
|
auto png_composite_16(T)(out T composite, uint fg, uint alpha, uint bg) {
|
|
return (composite) = cast(png_uint_16)(((fg) * (alpha) +
|
|
(bg)*(65535 - (alpha)) +
|
|
32767) / 65535); }
|
|
} /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
|
|
|
static if(PNG_READ_INT_FUNCTIONS_SUPPORTED){
|
|
uint png_get_uint_32(png_const_bytep buf);
|
|
png_uint_16 png_get_uint_16(png_const_bytep buf);
|
|
png_int_32 png_get_int_32(png_const_bytep buf);
|
|
}
|
|
|
|
uint png_get_uint_31(png_structp png_ptr,
|
|
png_const_bytep buf);
|
|
/* No png_get_int_16 -- may be added if there's a real need for it. */
|
|
|
|
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
|
|
static if(PNG_WRITE_INT_FUNCTIONS_SUPPORTED){
|
|
void png_save_uint_32(png_bytep buf, uint i);
|
|
}
|
|
static if(PNG_SAVE_INT_32_SUPPORTED){
|
|
void png_save_int_32(png_bytep buf, png_int_32 i);
|
|
}
|
|
|
|
/* Place a 16-bit number into a buffer in PNG byte order.
|
|
* The parameter is declared unsigned int, not png_uint_16,
|
|
* just to avoid potential problems on pre-ANSI C compilers.
|
|
*/
|
|
static if(PNG_WRITE_INT_FUNCTIONS_SUPPORTED){
|
|
void png_save_uint_16(png_bytep buf, uint i);
|
|
/* No png_save_int_16 -- may be added if there's a real need for it. */
|
|
}
|
|
|
|
version(PNG_USE_READ_MACROS){
|
|
/* Inline macros to do direct reads of bytes from the input buffer.
|
|
* The png_get_int_32() routine assumes we are using two's complement
|
|
* format for negative values, which is almost certainly true.
|
|
*/
|
|
auto png_get_uint_32(png_const_bytep buf) pure { return
|
|
((cast(uint)(*(buf)) << 24) +
|
|
(cast(uint)(*((buf) + 1)) << 16) +
|
|
(cast(uint)(*((buf) + 2)) << 8) +
|
|
(cast(uint)(*((buf) + 3)))); }
|
|
|
|
/* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
|
|
* function) incorrectly returned a value of type uint.
|
|
*/
|
|
auto png_get_uint_16(png_const_bytep buf) pure { return
|
|
(cast(png_uint_16)
|
|
((cast(uint)(*(buf)) << 8) +
|
|
(cast(uint)(*((buf) + 1))))); }
|
|
|
|
auto png_get_int_32(T)(png_const_bytep buf) pure { return
|
|
(cast(png_int_32)((*(buf) & 0x80)
|
|
? -(cast(png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1))
|
|
: cast(png_int_32)png_get_uint_32(buf))); }
|
|
}
|
|
|
|
static if(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED ||
|
|
PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED){
|
|
void png_set_check_for_invalid_index(png_structp png_ptr, int allowed);
|
|
}
|
|
|
|
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
|
|
* defs
|
|
*/
|
|
|
|
/* The last ordinal number (this is the *last* one already used; the next
|
|
* one to use is one more than this.) Maintainer, remember to add an entry to
|
|
* scripts/symbols.def as well.
|
|
*/
|
|
// PNG_EXPORT_LAST_ORDINAL(234);
|
|
|
|
}//extern (C)
|
|
|
|
} /* PNG_VERSION_INFO_ONLY */
|
|
/* Do not put anything past this line */
|