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/* png.h - header file for PNG reference library
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* libpng version 1.2.8 - December 3, 2004
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* Copyright (c) 1998-2004 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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* Authors and maintainers:
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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* libpng versions 0.97, January 1998, through 1.2.8 - December 3, 2004: Glenn
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* See also "Contributing Authors", below.
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* Note about libpng version numbers:
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* Due to various miscommunications, unforeseen code incompatibilities
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* and occasional factors outside the authors' control, version numbering
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* on the library has not always been consistent and straightforward.
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* The following table summarizes matters since version 0.89c, which was
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* the first widely used release:
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* source png.h png.h shared-lib
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* version string int version
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* ------- ------ ----- ----------
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* 0.89c "1.0 beta 3" 0.89 89 1.0.89
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* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
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* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
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* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
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* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
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* 0.97c 0.97 97 2.0.97
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* 0.99a-m 0.99 99 2.0.99
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* 1.00 1.00 100 2.1.0 [100 should be 10000]
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* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
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* 1.0.1 png.h string is 10001 2.1.0
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* 1.0.1a-e identical to the 10002 from here on, the shared library
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* 1.0.2 source version) 10002 is 2.V where V is the source code
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* 1.0.2a-b 10003 version, except as noted.
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* 1.0.5 (+ 2 patches) 10005
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* 1.0.5e-r 10100 (not source compatible)
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* 1.0.5s-v 10006 (not binary compatible)
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* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
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* 1.0.6d-f 10007 (still binary incompatible)
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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
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* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
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* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
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* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
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* 1.0.7 1 10007 (still compatible)
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* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
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* 1.0.8rc1 1 10008 2.1.0.8rc1
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* 1.0.8 1 10008 2.1.0.8
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* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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* 1.0.9rc1 1 10009 2.1.0.9rc1
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* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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* 1.0.9rc2 1 10009 2.1.0.9rc2
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* 1.0.9 1 10009 2.1.0.9
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* 1.0.10beta1 1 10010 2.1.0.10beta1
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* 1.0.10rc1 1 10010 2.1.0.10rc1
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* 1.0.10 1 10010 2.1.0.10
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* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
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* 1.0.11rc1 1 10011 2.1.0.11rc1
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* 1.0.11 1 10011 2.1.0.11
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* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
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* 1.0.12rc1 2 10012 2.1.0.12rc1
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* 1.0.12 2 10012 2.1.0.12
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* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
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* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
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* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
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* 1.2.0rc1 3 10200 3.1.2.0rc1
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* 1.2.0 3 10200 3.1.2.0
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* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
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* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
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* 1.2.1 3 10201 3.1.2.1
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* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
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* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
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* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
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* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
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* 1.0.13 10 10013 10.so.0.1.0.13
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* 1.2.2 12 10202 12.so.0.1.2.2
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* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
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* 1.2.3 12 10203 12.so.0.1.2.3
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* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
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* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
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* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
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* 1.0.14 10 10014 10.so.0.1.0.14
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* 1.2.4 13 10204 12.so.0.1.2.4
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* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
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* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
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* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
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* 1.0.15 10 10015 10.so.0.1.0.15
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* 1.2.5 13 10205 12.so.0.1.2.5
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* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
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* 1.0.16 10 10016 10.so.0.1.0.16
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* 1.2.6 13 10206 12.so.0.1.2.6
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* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
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* 1.0.17rc1 10 10017 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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* 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 "rcN".
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* Binary incompatibility exists only when applications make direct access
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* to the info_ptr or png_ptr members through png.h, and the compiled
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* application is loaded with a different version of the library.
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* DLLNUM will change each time there are forward or backward changes
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* in binary compatibility (e.g., when a new feature is added).
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* See libpng.txt or libpng.3 for more information. The PNG specification
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* is available as a W3C Recommendation and as an ISO Specification,
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* <http://www.w3.org/TR/2003/REC-PNG-20031110/
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* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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* If you modify libpng you may insert additional notices immediately following
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* libpng versions 1.2.6, August 15, 2004, through 1.2.8, December 3, 2004, are
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* Copyright (c) 2004 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.2.5
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* with the following individual added to the list of Contributing Authors:
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* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
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* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.0.6
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* with the following individuals added to the list of Contributing Authors:
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* Simon-Pierre Cadieux
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* and with the following additions to the disclaimer:
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* There is no warranty against interference with your enjoyment of the
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* library or against infringement. There is no warranty that our
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* efforts or the library will fulfill any of your particular purposes
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* or needs. This library is provided with all faults, and the entire
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* risk of satisfactory quality, performance, accuracy, and effort is with
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* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
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* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-0.96,
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* with the following individuals added to the list of Contributing Authors:
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* Glenn Randers-Pehrson
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* libpng versions 0.89, June 1996, through 0.96, May 1997, are
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* Copyright (c) 1996, 1997 Andreas Dilger
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* Distributed according to the same disclaimer and license as libpng-0.88,
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* with the following individuals added to the list of Contributing Authors:
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* libpng versions 0.5, May 1995, through 0.88, January 1996, are
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* For the purposes of this copyright and license, "Contributing Authors"
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* is defined as the following set of individuals:
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* The PNG Reference Library is supplied "AS IS". The Contributing Authors
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* and Group 42, Inc. disclaim all warranties, expressed or implied,
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* including, without limitation, the warranties of merchantability and of
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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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* 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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* 1. The origin of this source code must not be misrepresented.
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* 2. Altered versions must be plainly marked as such and
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* must not be misrepresented as being the original source.
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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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* 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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* A "png_get_copyright" function is available, for convenient use in "about"
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* boxes and the like:
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* printf("%s",png_get_copyright(NULL));
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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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* 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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* 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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* Thanks to Frank J. T. Wojcik for helping with the documentation.
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* Y2K compliance in libpng:
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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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* This is your unofficial assurance that libpng from version 0.71 and
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* upward through 1.2.8 are Y2K compliant. It is my belief that earlier
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* versions were also Y2K compliant.
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* Libpng only has three year fields. One is a 2-byte unsigned integer
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* that will hold years up to 65535. The other two hold the date in text
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* format, and will hold years up to 9999.
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* "png_uint_16 year" in png_time_struct.
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* "png_charp time_buffer" in png_struct and
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* "near_time_buffer", which is a local character string in png.c.
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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
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* png_get_tIME() in pngget.c
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* png_handle_tIME() in pngrutil.c, called in pngread.c
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* png_set_tIME() in pngset.c
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* png_write_tIME() in pngwutil.c, called in pngwrite.c
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* All handle dates properly in a Y2K environment. The
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* png_convert_from_time_t() function calls gmtime() to convert from system
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* clock time, which returns (year - 1900), which we properly convert to
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* the full 4-digit year. There is a possibility that applications using
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* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
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* function, or that they are incorrectly passing only a 2-digit year
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* instead of "year - 1900" into the png_convert_from_struct_tm() function,
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* but this is not under our control. The libpng documentation has always
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* stated that it works with 4-digit years, and the APIs have been
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* documented as such.
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* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
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* integer to hold the year, and can hold years as large as 65535.
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* zlib, upon which libpng depends, is also Y2K compliant. It contains
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* no date-related code.
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* Glenn Randers-Pehrson
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* PNG Development Group
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/* This is not the place to learn how to use libpng. The file libpng.txt
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* describes how to use libpng, and the file example.c summarizes it
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* with some code on which to build. This file is useful for looking
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* at the actual function definitions and structure components.
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/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.2.8"
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#define PNG_HEADER_VERSION_STRING \
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" libpng version 1.2.8 - December 3, 2004 (header)\n"
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#define PNG_LIBPNG_VER_SONUM 0
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#define PNG_LIBPNG_VER_DLLNUM 13
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/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
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#define PNG_LIBPNG_VER_MAJOR 1
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#define PNG_LIBPNG_VER_MINOR 2
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#define PNG_LIBPNG_VER_RELEASE 8
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/* This should match the numeric part of the final component of
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* PNG_LIBPNG_VER_STRING, omitting any leading zero: */
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#define PNG_LIBPNG_VER_BUILD 0
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#define PNG_LIBPNG_BUILD_ALPHA 1
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#define PNG_LIBPNG_BUILD_BETA 2
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#define PNG_LIBPNG_BUILD_RC 3
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#define PNG_LIBPNG_BUILD_STABLE 4
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#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
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/* Release-Specific Flags */
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#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
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PNG_LIBPNG_BUILD_STABLE only */
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#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
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PNG_LIBPNG_BUILD_SPECIAL */
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#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
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PNG_LIBPNG_BUILD_PRIVATE */
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#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
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/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
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* We must not include leading zeros.
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* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
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* version 1.0.0 was mis-numbered 100 instead of 10000). From
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* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
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#define PNG_LIBPNG_VER 10208 /* 1.2.8 */
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#ifndef PNG_VERSION_INFO_ONLY
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/* include the compression library's header */
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/* include all user configurable info, including optional assembler routines */
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* Added at libpng-1.2.8 */
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/* Ref MSDN: Private as priority over Special
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* VS_FF_PRIVATEBUILD File *was not* built using standard release
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* procedures. If this value is given, the StringFileInfo block must
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* contain a PrivateBuild string.
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* VS_FF_SPECIALBUILD File *was* built by the original company using
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* standard release procedures but is a variation of the standard
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* file of the same version number. If this value is given, the
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* StringFileInfo block must contain a SpecialBuild string.
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#if defined(PNG_USER_PRIVATEBUILD)
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# define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE | \
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PNG_LIBPNG_BUILD_PRIVATE
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# if defined(PNG_LIBPNG_SPECIALBUILD)
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# define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE | \
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PNG_LIBPNG_BUILD_SPECIAL
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# define PNG_LIBPNG_BUILD_TYPE PNG_LIBPNG_BUILD_BASE_TYPE
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#ifndef PNG_VERSION_INFO_ONLY
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/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
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#endif /* __cplusplus */
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/* This file is arranged in several sections. The first section contains
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* structure and type definitions. The second section contains the external
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* library functions, while the third has the internal library functions,
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* which applications aren't expected to use directly.
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#ifndef PNG_NO_TYPECAST_NULL
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#define int_p_NULL (int *)NULL
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#define png_bytep_NULL (png_bytep)NULL
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#define png_bytepp_NULL (png_bytepp)NULL
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#define png_doublep_NULL (png_doublep)NULL
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#define png_error_ptr_NULL (png_error_ptr)NULL
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#define png_flush_ptr_NULL (png_flush_ptr)NULL
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#define png_free_ptr_NULL (png_free_ptr)NULL
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#define png_infopp_NULL (png_infopp)NULL
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#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
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#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
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#define png_rw_ptr_NULL (png_rw_ptr)NULL
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#define png_structp_NULL (png_structp)NULL
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#define png_uint_16p_NULL (png_uint_16p)NULL
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#define png_voidp_NULL (png_voidp)NULL
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#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
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#define int_p_NULL NULL
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#define png_bytep_NULL NULL
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#define png_bytepp_NULL NULL
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#define png_doublep_NULL NULL
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#define png_error_ptr_NULL NULL
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#define png_flush_ptr_NULL NULL
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#define png_free_ptr_NULL NULL
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#define png_infopp_NULL NULL
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#define png_malloc_ptr_NULL NULL
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#define png_read_status_ptr_NULL NULL
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#define png_rw_ptr_NULL NULL
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#define png_structp_NULL NULL
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#define png_uint_16p_NULL NULL
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#define png_voidp_NULL NULL
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#define png_write_status_ptr_NULL NULL
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/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
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#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
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/* Version information for C files, stored in png.c. This had better match
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#ifdef PNG_USE_GLOBAL_ARRAYS
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PNG_EXPORT_VAR (const char) png_libpng_ver[18];
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/* need room for 99.99.99beta99z */
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#define png_libpng_ver png_get_header_ver(NULL)
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#ifdef PNG_USE_GLOBAL_ARRAYS
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/* This was removed in version 1.0.5c */
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/* Structures to facilitate easy interlacing. See png.c for more details */
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PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
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PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
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PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
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PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
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PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
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PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
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#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
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PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
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/* This isn't currently used. If you need it, see png.c for more details.
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PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
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#endif /* PNG_NO_EXTERN */
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/* Three color definitions. The order of the red, green, and blue, (and the
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* exact size) is not important, although the size of the fields need to
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* be png_byte or png_uint_16 (as defined below).
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typedef struct png_color_struct
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typedef png_color FAR * png_colorp;
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typedef png_color FAR * FAR * png_colorpp;
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typedef struct png_color_16_struct
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png_byte index; /* used for palette files */
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png_uint_16 red; /* for use in red green blue files */
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png_uint_16 gray; /* for use in grayscale files */
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typedef png_color_16 FAR * png_color_16p;
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typedef png_color_16 FAR * FAR * png_color_16pp;
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typedef struct png_color_8_struct
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png_byte red; /* for use in red green blue files */
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png_byte gray; /* for use in grayscale files */
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png_byte alpha; /* for alpha channel files */
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typedef png_color_8 FAR * png_color_8p;
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typedef png_color_8 FAR * FAR * png_color_8pp;
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* The following two structures are used for the in-core representation
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typedef struct png_sPLT_entry_struct
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png_uint_16 frequency;
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typedef png_sPLT_entry FAR * png_sPLT_entryp;
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typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
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/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
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* occupy the LSB of their respective members, and the MSB of each member
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* is zero-filled. The frequency member always occupies the full 16 bits.
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typedef struct png_sPLT_struct
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png_charp name; /* palette name */
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png_byte depth; /* depth of palette samples */
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png_sPLT_entryp entries; /* palette entries */
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png_int_32 nentries; /* number of palette entries */
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typedef png_sPLT_t FAR * png_sPLT_tp;
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typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
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#ifdef PNG_TEXT_SUPPORTED
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/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
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* and whether that contents is compressed or not. The "key" field
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* points to a regular zero-terminated C string. The "text", "lang", and
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* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
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* However, the * structure returned by png_get_text() will always contain
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* regular zero-terminated C strings (possibly empty), never NULL pointers,
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* so they can be safely used in printf() and other string-handling functions.
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typedef struct png_text_struct
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int compression; /* compression value:
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png_charp key; /* keyword, 1-79 character description of "text" */
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png_charp text; /* comment, may be an empty string (ie "")
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png_size_t text_length; /* length of the text string */
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#ifdef PNG_iTXt_SUPPORTED
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png_size_t itxt_length; /* length of the itxt string */
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png_charp lang; /* language code, 0-79 characters
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png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
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chars or a NULL pointer */
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typedef png_text FAR * png_textp;
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typedef png_text FAR * FAR * png_textpp;
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/* Supported compression types for text in PNG files (tEXt, and zTXt).
566
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
567
#define PNG_TEXT_COMPRESSION_NONE_WR -3
568
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
569
#define PNG_TEXT_COMPRESSION_NONE -1
570
#define PNG_TEXT_COMPRESSION_zTXt 0
571
#define PNG_ITXT_COMPRESSION_NONE 1
572
#define PNG_ITXT_COMPRESSION_zTXt 2
573
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
575
/* png_time is a way to hold the time in an machine independent way.
576
* Two conversions are provided, both from time_t and struct tm. There
577
* is no portable way to convert to either of these structures, as far
578
* as I know. If you know of a portable way, send it to me. As a side
579
* note - PNG has always been Year 2000 compliant!
581
typedef struct png_time_struct
583
png_uint_16 year; /* full year, as in, 1995 */
584
png_byte month; /* month of year, 1 - 12 */
585
png_byte day; /* day of month, 1 - 31 */
586
png_byte hour; /* hour of day, 0 - 23 */
587
png_byte minute; /* minute of hour, 0 - 59 */
588
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
590
typedef png_time FAR * png_timep;
591
typedef png_time FAR * FAR * png_timepp;
593
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
594
/* png_unknown_chunk is a structure to hold queued chunks for which there is
595
* no specific support. The idea is that we can use this to queue
596
* up private chunks for output even though the library doesn't actually
597
* know about their semantics.
599
typedef struct png_unknown_chunk_t
605
/* libpng-using applications should NOT directly modify this byte. */
606
png_byte location; /* mode of operation at read time */
609
typedef png_unknown_chunk FAR * png_unknown_chunkp;
610
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
613
/* png_info is a structure that holds the information in a PNG file so
614
* that the application can find out the characteristics of the image.
615
* If you are reading the file, this structure will tell you what is
616
* in the PNG file. If you are writing the file, fill in the information
617
* you want to put into the PNG file, then call png_write_info().
618
* The names chosen should be very close to the PNG specification, so
619
* consult that document for information about the meaning of each field.
621
* With libpng < 0.95, it was only possible to directly set and read the
622
* the values in the png_info_struct, which meant that the contents and
623
* order of the values had to remain fixed. With libpng 0.95 and later,
624
* however, there are now functions that abstract the contents of
625
* png_info_struct from the application, so this makes it easier to use
626
* libpng with dynamic libraries, and even makes it possible to use
627
* libraries that don't have all of the libpng ancillary chunk-handing
630
* In any case, the order of the parameters in png_info_struct should NOT
631
* be changed for as long as possible to keep compatibility with applications
632
* that use the old direct-access method with png_info_struct.
634
* The following members may have allocated storage attached that should be
635
* cleaned up before the structure is discarded: palette, trans, text,
636
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
637
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
638
* are automatically freed when the info structure is deallocated, if they were
639
* allocated internally by libpng. This behavior can be changed by means
640
* of the png_data_freer() function.
642
* More allocation details: all the chunk-reading functions that
643
* change these members go through the corresponding png_set_*
644
* functions. A function to clear these members is available: see
645
* png_free_data(). The png_set_* functions do not depend on being
646
* able to point info structure members to any of the storage they are
647
* passed (they make their own copies), EXCEPT that the png_set_text
648
* functions use the same storage passed to them in the text_ptr or
649
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
650
* functions do not make their own copies.
652
typedef struct png_info_struct
654
/* the following are necessary for every PNG file */
655
png_uint_32 width; /* width of image in pixels (from IHDR) */
656
png_uint_32 height; /* height of image in pixels (from IHDR) */
657
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
658
png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
659
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
660
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
661
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
662
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
663
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
664
/* The following three should have been named *_method not *_type */
665
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
666
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
667
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
669
/* The following is informational only on read, and not used on writes. */
670
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
671
png_byte pixel_depth; /* number of bits per pixel */
672
png_byte spare_byte; /* to align the data, and for future use */
673
png_byte signature[8]; /* magic bytes read by libpng from start of file */
675
/* The rest of the data is optional. If you are reading, check the
676
* valid field to see if the information in these are valid. If you
677
* are writing, set the valid field to those chunks you want written,
678
* and initialize the appropriate fields below.
681
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
682
/* The gAMA chunk describes the gamma characteristics of the system
683
* on which the image was created, normally in the range [1.0, 2.5].
684
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
686
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
689
#if defined(PNG_sRGB_SUPPORTED)
691
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
692
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
695
#if defined(PNG_TEXT_SUPPORTED)
696
/* The tEXt, and zTXt chunks contain human-readable textual data in
697
* uncompressed, compressed, and optionally compressed forms, respectively.
698
* The data in "text" is an array of pointers to uncompressed,
699
* null-terminated C strings. Each chunk has a keyword that describes the
700
* textual data contained in that chunk. Keywords are not required to be
701
* unique, and the text string may be empty. Any number of text chunks may
704
int num_text; /* number of comments read/to write */
705
int max_text; /* current size of text array */
706
png_textp text; /* array of comments read/to write */
707
#endif /* PNG_TEXT_SUPPORTED */
709
#if defined(PNG_tIME_SUPPORTED)
710
/* The tIME chunk holds the last time the displayed image data was
711
* modified. See the png_time struct for the contents of this struct.
716
#if defined(PNG_sBIT_SUPPORTED)
717
/* The sBIT chunk specifies the number of significant high-order bits
718
* in the pixel data. Values are in the range [1, bit_depth], and are
719
* only specified for the channels in the pixel data. The contents of
720
* the low-order bits is not specified. Data is valid if
721
* (valid & PNG_INFO_sBIT) is non-zero.
723
png_color_8 sig_bit; /* significant bits in color channels */
726
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
727
defined(PNG_READ_BACKGROUND_SUPPORTED)
728
/* The tRNS chunk supplies transparency data for paletted images and
729
* other image types that don't need a full alpha channel. There are
730
* "num_trans" transparency values for a paletted image, stored in the
731
* same order as the palette colors, starting from index 0. Values
732
* for the data are in the range [0, 255], ranging from fully transparent
733
* to fully opaque, respectively. For non-paletted images, there is a
734
* single color specified that should be treated as fully transparent.
735
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
737
png_bytep trans; /* transparent values for paletted image */
738
png_color_16 trans_values; /* transparent color for non-palette image */
741
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
742
/* The bKGD chunk gives the suggested image background color if the
743
* display program does not have its own background color and the image
744
* is needs to composited onto a background before display. The colors
745
* in "background" are normally in the same color space/depth as the
746
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
748
png_color_16 background;
751
#if defined(PNG_oFFs_SUPPORTED)
752
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
753
* and downwards from the top-left corner of the display, page, or other
754
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
755
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
757
png_int_32 x_offset; /* x offset on page */
758
png_int_32 y_offset; /* y offset on page */
759
png_byte offset_unit_type; /* offset units type */
762
#if defined(PNG_pHYs_SUPPORTED)
763
/* The pHYs chunk gives the physical pixel density of the image for
764
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
765
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
767
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
768
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
769
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
772
#if defined(PNG_hIST_SUPPORTED)
773
/* The hIST chunk contains the relative frequency or importance of the
774
* various palette entries, so that a viewer can intelligently select a
775
* reduced-color palette, if required. Data is an array of "num_palette"
776
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
782
#ifdef PNG_cHRM_SUPPORTED
783
/* The cHRM chunk describes the CIE color characteristics of the monitor
784
* on which the PNG was created. This data allows the viewer to do gamut
785
* mapping of the input image to ensure that the viewer sees the same
786
* colors in the image as the creator. Values are in the range
787
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
789
#ifdef PNG_FLOATING_POINT_SUPPORTED
801
#if defined(PNG_pCAL_SUPPORTED)
802
/* The pCAL chunk describes a transformation between the stored pixel
803
* values and original physical data values used to create the image.
804
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
805
* range given by [pcal_X0, pcal_X1], and are further transformed by a
806
* (possibly non-linear) transformation function given by "pcal_type"
807
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
808
* defines below, and the PNG-Group's PNG extensions document for a
809
* complete description of the transformations and how they should be
810
* implemented, and for a description of the ASCII parameter strings.
811
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
813
png_charp pcal_purpose; /* pCAL chunk description string */
814
png_int_32 pcal_X0; /* minimum value */
815
png_int_32 pcal_X1; /* maximum value */
816
png_charp pcal_units; /* Latin-1 string giving physical units */
817
png_charpp pcal_params; /* ASCII strings containing parameter values */
818
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
819
png_byte pcal_nparams; /* number of parameters given in pcal_params */
822
/* New members added in libpng-1.0.6 */
823
#ifdef PNG_FREE_ME_SUPPORTED
824
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
827
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
828
/* storage for unknown chunks that the library doesn't recognize. */
829
png_unknown_chunkp unknown_chunks;
830
png_size_t unknown_chunks_num;
833
#if defined(PNG_iCCP_SUPPORTED)
834
/* iCCP chunk data. */
835
png_charp iccp_name; /* profile name */
836
png_charp iccp_profile; /* International Color Consortium profile data */
837
/* Note to maintainer: should be png_bytep */
838
png_uint_32 iccp_proflen; /* ICC profile data length */
839
png_byte iccp_compression; /* Always zero */
842
#if defined(PNG_sPLT_SUPPORTED)
843
/* data on sPLT chunks (there may be more than one). */
844
png_sPLT_tp splt_palettes;
845
png_uint_32 splt_palettes_num;
848
#if defined(PNG_sCAL_SUPPORTED)
849
/* The sCAL chunk describes the actual physical dimensions of the
850
* subject matter of the graphic. The chunk contains a unit specification
851
* a byte value, and two ASCII strings representing floating-point
852
* values. The values are width and height corresponsing to one pixel
853
* in the image. This external representation is converted to double
854
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
856
png_byte scal_unit; /* unit of physical scale */
857
#ifdef PNG_FLOATING_POINT_SUPPORTED
858
double scal_pixel_width; /* width of one pixel */
859
double scal_pixel_height; /* height of one pixel */
861
#ifdef PNG_FIXED_POINT_SUPPORTED
862
png_charp scal_s_width; /* string containing height */
863
png_charp scal_s_height; /* string containing width */
867
#if defined(PNG_INFO_IMAGE_SUPPORTED)
868
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
869
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
870
png_bytepp row_pointers; /* the image bits */
873
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
874
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
877
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
878
png_fixed_point int_x_white;
879
png_fixed_point int_y_white;
880
png_fixed_point int_x_red;
881
png_fixed_point int_y_red;
882
png_fixed_point int_x_green;
883
png_fixed_point int_y_green;
884
png_fixed_point int_x_blue;
885
png_fixed_point int_y_blue;
890
typedef png_info FAR * png_infop;
891
typedef png_info FAR * FAR * png_infopp;
893
/* Maximum positive integer used in PNG is (2^31)-1 */
894
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
895
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
896
#define PNG_SIZE_MAX ((png_size_t)(-1))
897
/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
898
#define PNG_MAX_UINT PNG_UINT_31_MAX
900
/* These describe the color_type field in png_info. */
901
/* color type masks */
902
#define PNG_COLOR_MASK_PALETTE 1
903
#define PNG_COLOR_MASK_COLOR 2
904
#define PNG_COLOR_MASK_ALPHA 4
906
/* color types. Note that not all combinations are legal */
907
#define PNG_COLOR_TYPE_GRAY 0
908
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
909
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
910
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
911
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
913
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
914
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
916
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
917
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
918
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
920
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
921
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
922
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
923
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
925
/* These are for the interlacing type. These values should NOT be changed. */
926
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
927
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
928
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
930
/* These are for the oFFs chunk. These values should NOT be changed. */
931
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
932
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
933
#define PNG_OFFSET_LAST 2 /* Not a valid value */
935
/* These are for the pCAL chunk. These values should NOT be changed. */
936
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
937
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
938
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
939
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
940
#define PNG_EQUATION_LAST 4 /* Not a valid value */
942
/* These are for the sCAL chunk. These values should NOT be changed. */
943
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
944
#define PNG_SCALE_METER 1 /* meters per pixel */
945
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
946
#define PNG_SCALE_LAST 3 /* Not a valid value */
948
/* These are for the pHYs chunk. These values should NOT be changed. */
949
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
950
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
951
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
953
/* These are for the sRGB chunk. These values should NOT be changed. */
954
#define PNG_sRGB_INTENT_PERCEPTUAL 0
955
#define PNG_sRGB_INTENT_RELATIVE 1
956
#define PNG_sRGB_INTENT_SATURATION 2
957
#define PNG_sRGB_INTENT_ABSOLUTE 3
958
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
960
/* This is for text chunks */
961
#define PNG_KEYWORD_MAX_LENGTH 79
963
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
964
#define PNG_MAX_PALETTE_LENGTH 256
966
/* These determine if an ancillary chunk's data has been successfully read
967
* from the PNG header, or if the application has filled in the corresponding
968
* data in the info_struct to be written into the output file. The values
969
* of the PNG_INFO_<chunk> defines should NOT be changed.
971
#define PNG_INFO_gAMA 0x0001
972
#define PNG_INFO_sBIT 0x0002
973
#define PNG_INFO_cHRM 0x0004
974
#define PNG_INFO_PLTE 0x0008
975
#define PNG_INFO_tRNS 0x0010
976
#define PNG_INFO_bKGD 0x0020
977
#define PNG_INFO_hIST 0x0040
978
#define PNG_INFO_pHYs 0x0080
979
#define PNG_INFO_oFFs 0x0100
980
#define PNG_INFO_tIME 0x0200
981
#define PNG_INFO_pCAL 0x0400
982
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
983
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
984
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
985
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
986
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
988
/* This is used for the transformation routines, as some of them
989
* change these values for the row. It also should enable using
990
* the routines for other purposes.
992
typedef struct png_row_info_struct
994
png_uint_32 width; /* width of row */
995
png_uint_32 rowbytes; /* number of bytes in row */
996
png_byte color_type; /* color type of row */
997
png_byte bit_depth; /* bit depth of row */
998
png_byte channels; /* number of channels (1, 2, 3, or 4) */
999
png_byte pixel_depth; /* bits per pixel (depth * channels) */
1002
typedef png_row_info FAR * png_row_infop;
1003
typedef png_row_info FAR * FAR * png_row_infopp;
1005
/* These are the function types for the I/O functions and for the functions
1006
* that allow the user to override the default I/O functions with his or her
1007
* own. The png_error_ptr type should match that of user-supplied warning
1008
* and error functions, while the png_rw_ptr type should match that of the
1009
* user read/write data functions.
1011
typedef struct png_struct_def png_struct;
1012
typedef png_struct FAR * png_structp;
1014
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1015
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1016
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1017
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1019
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1022
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1023
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
1024
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1025
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1029
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1030
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1031
defined(PNG_LEGACY_SUPPORTED)
1032
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1033
png_row_infop, png_bytep));
1036
#if defined(PNG_USER_CHUNKS_SUPPORTED)
1037
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
1039
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1040
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1043
/* Transform masks for the high-level interface */
1044
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1045
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1046
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1047
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1048
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1049
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1050
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1051
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1052
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1053
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1054
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1055
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1056
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
1058
/* Flags for MNG supported features */
1059
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1060
#define PNG_FLAG_MNG_FILTER_64 0x04
1061
#define PNG_ALL_MNG_FEATURES 0x05
1063
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
1064
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1066
/* The structure that holds the information to read and write PNG files.
1067
* The only people who need to care about what is inside of this are the
1068
* people who will be modifying the library for their own special needs.
1069
* It should NOT be accessed directly by an application, except to store
1073
struct png_struct_def
1075
#ifdef PNG_SETJMP_SUPPORTED
1076
jmp_buf jmpbuf; /* used in png_error */
1078
png_error_ptr error_fn; /* function for printing errors and aborting */
1079
png_error_ptr warning_fn; /* function for printing warnings */
1080
png_voidp error_ptr; /* user supplied struct for error functions */
1081
png_rw_ptr write_data_fn; /* function for writing output data */
1082
png_rw_ptr read_data_fn; /* function for reading input data */
1083
png_voidp io_ptr; /* ptr to application struct for I/O functions */
1085
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
1086
png_user_transform_ptr read_user_transform_fn; /* user read transform */
1089
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1090
png_user_transform_ptr write_user_transform_fn; /* user write transform */
1093
/* These were added in libpng-1.0.2 */
1094
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
1095
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1096
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1097
png_voidp user_transform_ptr; /* user supplied struct for user transform */
1098
png_byte user_transform_depth; /* bit depth of user transformed pixels */
1099
png_byte user_transform_channels; /* channels in user transformed pixels */
1103
png_uint_32 mode; /* tells us where we are in the PNG file */
1104
png_uint_32 flags; /* flags indicating various things to libpng */
1105
png_uint_32 transformations; /* which transformations to perform */
1107
z_stream zstream; /* pointer to decompression structure (below) */
1108
png_bytep zbuf; /* buffer for zlib */
1109
png_size_t zbuf_size; /* size of zbuf */
1110
int zlib_level; /* holds zlib compression level */
1111
int zlib_method; /* holds zlib compression method */
1112
int zlib_window_bits; /* holds zlib compression window bits */
1113
int zlib_mem_level; /* holds zlib compression memory level */
1114
int zlib_strategy; /* holds zlib compression strategy */
1116
png_uint_32 width; /* width of image in pixels */
1117
png_uint_32 height; /* height of image in pixels */
1118
png_uint_32 num_rows; /* number of rows in current pass */
1119
png_uint_32 usr_width; /* width of row at start of write */
1120
png_uint_32 rowbytes; /* size of row in bytes */
1121
png_uint_32 irowbytes; /* size of current interlaced row in bytes */
1122
png_uint_32 iwidth; /* width of current interlaced row in pixels */
1123
png_uint_32 row_number; /* current row in interlace pass */
1124
png_bytep prev_row; /* buffer to save previous (unfiltered) row */
1125
png_bytep row_buf; /* buffer to save current (unfiltered) row */
1126
png_bytep sub_row; /* buffer to save "sub" row when filtering */
1127
png_bytep up_row; /* buffer to save "up" row when filtering */
1128
png_bytep avg_row; /* buffer to save "avg" row when filtering */
1129
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
1130
png_row_info row_info; /* used for transformation routines */
1132
png_uint_32 idat_size; /* current IDAT size for read */
1133
png_uint_32 crc; /* current chunk CRC value */
1134
png_colorp palette; /* palette from the input file */
1135
png_uint_16 num_palette; /* number of color entries in palette */
1136
png_uint_16 num_trans; /* number of transparency values */
1137
png_byte chunk_name[5]; /* null-terminated name of current chunk */
1138
png_byte compression; /* file compression type (always 0) */
1139
png_byte filter; /* file filter type (always 0) */
1140
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
1141
png_byte pass; /* current interlace pass (0 - 6) */
1142
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
1143
png_byte color_type; /* color type of file */
1144
png_byte bit_depth; /* bit depth of file */
1145
png_byte usr_bit_depth; /* bit depth of users row */
1146
png_byte pixel_depth; /* number of bits per pixel */
1147
png_byte channels; /* number of channels in file */
1148
png_byte usr_channels; /* channels at start of write */
1149
png_byte sig_bytes; /* magic bytes read/written from start of file */
1151
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1152
#ifdef PNG_LEGACY_SUPPORTED
1153
png_byte filler; /* filler byte for pixel expansion */
1155
png_uint_16 filler; /* filler bytes for pixel expansion */
1159
#if defined(PNG_bKGD_SUPPORTED)
1160
png_byte background_gamma_type;
1161
# ifdef PNG_FLOATING_POINT_SUPPORTED
1162
float background_gamma;
1164
png_color_16 background; /* background color in screen gamma space */
1165
#if defined(PNG_READ_GAMMA_SUPPORTED)
1166
png_color_16 background_1; /* background normalized to gamma 1.0 */
1168
#endif /* PNG_bKGD_SUPPORTED */
1170
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1171
png_flush_ptr output_flush_fn;/* Function for flushing output */
1172
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
1173
png_uint_32 flush_rows; /* number of rows written since last flush */
1176
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1177
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
1178
#ifdef PNG_FLOATING_POINT_SUPPORTED
1179
float gamma; /* file gamma value */
1180
float screen_gamma; /* screen gamma value (display_exponent) */
1184
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1185
png_bytep gamma_table; /* gamma table for 8-bit depth files */
1186
png_bytep gamma_from_1; /* converts from 1.0 to screen */
1187
png_bytep gamma_to_1; /* converts from file to 1.0 */
1188
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
1189
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
1190
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
1193
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1194
png_color_8 sig_bit; /* significant bits in each available channel */
1197
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1198
png_color_8 shift; /* shift for significant bit tranformation */
1201
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1202
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1203
png_bytep trans; /* transparency values for paletted files */
1204
png_color_16 trans_values; /* transparency values for non-paletted files */
1207
png_read_status_ptr read_row_fn; /* called after each row is decoded */
1208
png_write_status_ptr write_row_fn; /* called after each row is encoded */
1209
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1210
png_progressive_info_ptr info_fn; /* called after header data fully read */
1211
png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
1212
png_progressive_end_ptr end_fn; /* called after image is complete */
1213
png_bytep save_buffer_ptr; /* current location in save_buffer */
1214
png_bytep save_buffer; /* buffer for previously read data */
1215
png_bytep current_buffer_ptr; /* current location in current_buffer */
1216
png_bytep current_buffer; /* buffer for recently used data */
1217
png_uint_32 push_length; /* size of current input chunk */
1218
png_uint_32 skip_length; /* bytes to skip in input data */
1219
png_size_t save_buffer_size; /* amount of data now in save_buffer */
1220
png_size_t save_buffer_max; /* total size of save_buffer */
1221
png_size_t buffer_size; /* total amount of available input data */
1222
png_size_t current_buffer_size; /* amount of data now in current_buffer */
1223
int process_mode; /* what push library is currently doing */
1224
int cur_palette; /* current push library palette index */
1226
# if defined(PNG_TEXT_SUPPORTED)
1227
png_size_t current_text_size; /* current size of text input data */
1228
png_size_t current_text_left; /* how much text left to read in input */
1229
png_charp current_text; /* current text chunk buffer */
1230
png_charp current_text_ptr; /* current location in current_text */
1231
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
1233
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1235
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1236
/* for the Borland special 64K segment handler */
1237
png_bytepp offset_table_ptr;
1238
png_bytep offset_table;
1239
png_uint_16 offset_table_number;
1240
png_uint_16 offset_table_count;
1241
png_uint_16 offset_table_count_free;
1244
#if defined(PNG_READ_DITHER_SUPPORTED)
1245
png_bytep palette_lookup; /* lookup table for dithering */
1246
png_bytep dither_index; /* index translation for palette files */
1249
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1250
png_uint_16p hist; /* histogram */
1253
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
1254
png_byte heuristic_method; /* heuristic for row filter selection */
1255
png_byte num_prev_filters; /* number of weights for previous rows */
1256
png_bytep prev_filters; /* filter type(s) of previous row(s) */
1257
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
1258
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
1259
png_uint_16p filter_costs; /* relative filter calculation cost */
1260
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
1263
#if defined(PNG_TIME_RFC1123_SUPPORTED)
1264
png_charp time_buffer; /* String to hold RFC 1123 time text */
1267
/* New members added in libpng-1.0.6 */
1269
#ifdef PNG_FREE_ME_SUPPORTED
1270
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
1273
#if defined(PNG_USER_CHUNKS_SUPPORTED)
1274
png_voidp user_chunk_ptr;
1275
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
1278
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
1280
png_bytep chunk_list;
1283
/* New members added in libpng-1.0.3 */
1284
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1285
png_byte rgb_to_gray_status;
1286
/* These were changed from png_byte in libpng-1.0.6 */
1287
png_uint_16 rgb_to_gray_red_coeff;
1288
png_uint_16 rgb_to_gray_green_coeff;
1289
png_uint_16 rgb_to_gray_blue_coeff;
1292
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1293
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1294
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1295
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1296
/* changed from png_byte to png_uint_32 at version 1.2.0 */
1298
png_byte mng_features_permitted;
1300
png_uint_32 mng_features_permitted;
1301
#endif /* PNG_1_0_X */
1304
/* New member added in libpng-1.0.7 */
1305
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1306
png_fixed_point int_gamma;
1309
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1310
#if defined(PNG_MNG_FEATURES_SUPPORTED)
1311
png_byte filter_type;
1314
#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
1315
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
1316
png_uint_32 row_buf_size;
1319
/* New members added in libpng-1.2.0 */
1320
#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
1321
png_byte mmx_bitdepth_threshold;
1322
png_uint_32 mmx_rowbytes_threshold;
1323
png_uint_32 asm_flags;
1326
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1327
#ifdef PNG_USER_MEM_SUPPORTED
1328
png_voidp mem_ptr; /* user supplied struct for mem functions */
1329
png_malloc_ptr malloc_fn; /* function for allocating memory */
1330
png_free_ptr free_fn; /* function for freeing memory */
1333
/* New member added in libpng-1.0.13 and 1.2.0 */
1334
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
1336
#if defined(PNG_READ_DITHER_SUPPORTED)
1337
/* The following three members were added at version 1.0.14 and 1.2.4 */
1338
png_bytep dither_sort; /* working sort array */
1339
png_bytep index_to_palette; /* where the original index currently is */
1340
/* in the palette */
1341
png_bytep palette_to_index; /* which original index points to this */
1345
/* New members added in libpng-1.0.16 and 1.2.6 */
1346
png_byte compression_type;
1348
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
1349
png_uint_32 user_width_max;
1350
png_uint_32 user_height_max;
1356
/* This triggers a compiler error in png.c, if png.c and png.h
1357
* do not agree upon the version number.
1359
typedef png_structp version_1_2_8;
1361
typedef png_struct FAR * FAR * png_structpp;
1363
/* Here are the function definitions most commonly used. This is not
1364
* the place to find out how to use libpng. See libpng.txt for the
1365
* full explanation, see example.c for the summary. This just provides
1366
* a simple one line description of the use of each function.
1369
/* Returns the version number of the library */
1370
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1372
/* Tell lib we have already handled the first <num_bytes> magic bytes.
1373
* Handling more than 8 bytes from the beginning of the file is an error.
1375
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1378
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1379
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1380
* signature, and non-zero otherwise. Having num_to_check == 0 or
1381
* start > 7 will always fail (ie return non-zero).
1383
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1384
png_size_t num_to_check));
1386
/* Simple signature checking function. This is the same as calling
1387
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1389
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
1391
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1392
extern PNG_EXPORT(png_structp,png_create_read_struct)
1393
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1394
png_error_ptr error_fn, png_error_ptr warn_fn));
1396
/* Allocate and initialize png_ptr struct for writing, and any other memory */
1397
extern PNG_EXPORT(png_structp,png_create_write_struct)
1398
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1399
png_error_ptr error_fn, png_error_ptr warn_fn));
1401
#ifdef PNG_WRITE_SUPPORTED
1402
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
1403
PNGARG((png_structp png_ptr));
1406
#ifdef PNG_WRITE_SUPPORTED
1407
extern PNG_EXPORT(void,png_set_compression_buffer_size)
1408
PNGARG((png_structp png_ptr, png_uint_32 size));
1411
/* Reset the compression stream */
1412
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1414
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1415
#ifdef PNG_USER_MEM_SUPPORTED
1416
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
1417
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1418
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1419
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1420
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
1421
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1422
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1423
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1426
/* Write a PNG chunk - size, type, (optional) data, CRC. */
1427
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1428
png_bytep chunk_name, png_bytep data, png_size_t length));
1430
/* Write the start of a PNG chunk - length and chunk name. */
1431
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1432
png_bytep chunk_name, png_uint_32 length));
1434
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1435
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1436
png_bytep data, png_size_t length));
1438
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1439
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1441
/* Allocate and initialize the info structure */
1442
extern PNG_EXPORT(png_infop,png_create_info_struct)
1443
PNGARG((png_structp png_ptr));
1445
/* Initialize the info structure (old interface - DEPRECATED) */
1446
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
1447
#undef png_info_init
1448
#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
1449
png_sizeof(png_info));
1450
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1451
png_size_t png_info_struct_size));
1453
/* Writes all the PNG information before the image. */
1454
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1455
png_infop info_ptr));
1456
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1457
png_infop info_ptr));
1459
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1460
/* read the information before the actual image data. */
1461
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1462
png_infop info_ptr));
1465
#if defined(PNG_TIME_RFC1123_SUPPORTED)
1466
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1467
PNGARG((png_structp png_ptr, png_timep ptime));
1470
#if !defined(_WIN32_WCE)
1471
/* "time.h" functions are not supported on WindowsCE */
1472
#if defined(PNG_WRITE_tIME_SUPPORTED)
1473
/* convert from a struct tm to png_time */
1474
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1475
struct tm FAR * ttime));
1477
/* convert from time_t to png_time. Uses gmtime() */
1478
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1480
#endif /* PNG_WRITE_tIME_SUPPORTED */
1481
#endif /* _WIN32_WCE */
1483
#if defined(PNG_READ_EXPAND_SUPPORTED)
1484
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1485
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1486
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
1487
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1488
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1491
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1492
/* Use blue, green, red order for pixels. */
1493
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1496
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
1497
/* Expand the grayscale to 24-bit RGB if necessary. */
1498
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1501
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
1502
/* Reduce RGB to grayscale. */
1503
#ifdef PNG_FLOATING_POINT_SUPPORTED
1504
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1505
int error_action, double red, double green ));
1507
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1508
int error_action, png_fixed_point red, png_fixed_point green ));
1509
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1513
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1514
png_colorp palette));
1516
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
1517
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1520
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1521
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1522
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1525
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1526
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1527
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1530
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1531
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1532
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1533
png_uint_32 filler, int flags));
1534
/* The values of the PNG_FILLER_ defines should NOT be changed */
1535
#define PNG_FILLER_BEFORE 0
1536
#define PNG_FILLER_AFTER 1
1537
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1538
#if !defined(PNG_1_0_X)
1539
extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1540
png_uint_32 filler, int flags));
1542
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1544
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1545
/* Swap bytes in 16-bit depth files. */
1546
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1549
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1550
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1551
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1554
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1555
/* Swap packing order of pixels in bytes. */
1556
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1559
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1560
/* Converts files to legal bit depths. */
1561
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1562
png_color_8p true_bits));
1565
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1566
defined(PNG_WRITE_INTERLACING_SUPPORTED)
1567
/* Have the code handle the interlacing. Returns the number of passes. */
1568
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1571
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1572
/* Invert monochrome files */
1573
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1576
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
1577
/* Handle alpha and tRNS by replacing with a background color. */
1578
#ifdef PNG_FLOATING_POINT_SUPPORTED
1579
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1580
png_color_16p background_color, int background_gamma_code,
1581
int need_expand, double background_gamma));
1583
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1584
#define PNG_BACKGROUND_GAMMA_SCREEN 1
1585
#define PNG_BACKGROUND_GAMMA_FILE 2
1586
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1589
#if defined(PNG_READ_16_TO_8_SUPPORTED)
1590
/* strip the second byte of information from a 16-bit depth file. */
1591
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1594
#if defined(PNG_READ_DITHER_SUPPORTED)
1595
/* Turn on dithering, and reduce the palette to the number of colors available. */
1596
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
1597
png_colorp palette, int num_palette, int maximum_colors,
1598
png_uint_16p histogram, int full_dither));
1601
#if defined(PNG_READ_GAMMA_SUPPORTED)
1602
/* Handle gamma correction. Screen_gamma=(display_exponent) */
1603
#ifdef PNG_FLOATING_POINT_SUPPORTED
1604
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1605
double screen_gamma, double default_file_gamma));
1609
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1610
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1611
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
1612
/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
1613
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
1614
int empty_plte_permitted));
1617
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
1618
/* Set how many lines between output flushes - 0 for no flushing */
1619
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1620
/* Flush the current PNG output buffer */
1621
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1624
/* optional update palette with requested transformations */
1625
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1627
/* optional call to update the users info structure */
1628
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1629
png_infop info_ptr));
1631
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1632
/* read one or more rows of image data. */
1633
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1634
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1637
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1638
/* read a row of data. */
1639
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1641
png_bytep display_row));
1644
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1645
/* read the whole image into memory at once. */
1646
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1650
/* write a row of image data */
1651
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1654
/* write a few rows of image data */
1655
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1656
png_bytepp row, png_uint_32 num_rows));
1658
/* write the image data */
1659
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1662
/* writes the end of the PNG file. */
1663
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1664
png_infop info_ptr));
1666
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
1667
/* read the end of the PNG file. */
1668
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1669
png_infop info_ptr));
1672
/* free any memory associated with the png_info_struct */
1673
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1674
png_infopp info_ptr_ptr));
1676
/* free any memory associated with the png_struct and the png_info_structs */
1677
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1678
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1680
/* free all memory used by the read (old method - NOT DLL EXPORTED) */
1681
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
1682
png_infop end_info_ptr));
1684
/* free any memory associated with the png_struct and the png_info_structs */
1685
extern PNG_EXPORT(void,png_destroy_write_struct)
1686
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1688
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
1689
extern void png_write_destroy PNGARG((png_structp png_ptr));
1691
/* set the libpng method of handling chunk CRC errors */
1692
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1693
int crit_action, int ancil_action));
1695
/* Values for png_set_crc_action() to say how to handle CRC errors in
1696
* ancillary and critical chunks, and whether to use the data contained
1697
* therein. Note that it is impossible to "discard" data in a critical
1698
* chunk. For versions prior to 0.90, the action was always error/quit,
1699
* whereas in version 0.90 and later, the action for CRC errors in ancillary
1700
* chunks is warn/discard. These values should NOT be changed.
1702
* value action:critical action:ancillary
1704
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1705
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1706
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1707
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1708
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1709
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1711
/* These functions give the user control over the scan-line filtering in
1712
* libpng and the compression methods used by zlib. These functions are
1713
* mainly useful for testing, as the defaults should work with most users.
1714
* Those users who are tight on memory or want faster performance at the
1715
* expense of compression can modify them. See the compression library
1716
* header file (zlib.h) for an explination of the compression functions.
1719
/* set the filtering method(s) used by libpng. Currently, the only valid
1720
* value for "method" is 0.
1722
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1725
/* Flags for png_set_filter() to say which filters to use. The flags
1726
* are chosen so that they don't conflict with real filter types
1727
* below, in case they are supplied instead of the #defined constants.
1728
* These values should NOT be changed.
1730
#define PNG_NO_FILTERS 0x00
1731
#define PNG_FILTER_NONE 0x08
1732
#define PNG_FILTER_SUB 0x10
1733
#define PNG_FILTER_UP 0x20
1734
#define PNG_FILTER_AVG 0x40
1735
#define PNG_FILTER_PAETH 0x80
1736
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1737
PNG_FILTER_AVG | PNG_FILTER_PAETH)
1739
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1740
* These defines should NOT be changed.
1742
#define PNG_FILTER_VALUE_NONE 0
1743
#define PNG_FILTER_VALUE_SUB 1
1744
#define PNG_FILTER_VALUE_UP 2
1745
#define PNG_FILTER_VALUE_AVG 3
1746
#define PNG_FILTER_VALUE_PAETH 4
1747
#define PNG_FILTER_VALUE_LAST 5
1749
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
1750
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1751
* defines, either the default (minimum-sum-of-absolute-differences), or
1752
* the experimental method (weighted-minimum-sum-of-absolute-differences).
1754
* Weights are factors >= 1.0, indicating how important it is to keep the
1755
* filter type consistent between rows. Larger numbers mean the current
1756
* filter is that many times as likely to be the same as the "num_weights"
1757
* previous filters. This is cumulative for each previous row with a weight.
1758
* There needs to be "num_weights" values in "filter_weights", or it can be
1759
* NULL if the weights aren't being specified. Weights have no influence on
1760
* the selection of the first row filter. Well chosen weights can (in theory)
1761
* improve the compression for a given image.
1763
* Costs are factors >= 1.0 indicating the relative decoding costs of a
1764
* filter type. Higher costs indicate more decoding expense, and are
1765
* therefore less likely to be selected over a filter with lower computational
1766
* costs. There needs to be a value in "filter_costs" for each valid filter
1767
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1768
* setting the costs. Costs try to improve the speed of decompression without
1769
* unduly increasing the compressed image size.
1771
* A negative weight or cost indicates the default value is to be used, and
1772
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1773
* The default values for both weights and costs are currently 1.0, but may
1774
* change if good general weighting/cost heuristics can be found. If both
1775
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1776
* to the UNWEIGHTED method, but with added encoding time/computation.
1778
#ifdef PNG_FLOATING_POINT_SUPPORTED
1779
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1780
int heuristic_method, int num_weights, png_doublep filter_weights,
1781
png_doublep filter_costs));
1783
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1785
/* Heuristic used for row filter selection. These defines should NOT be
1788
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1789
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1790
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1791
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1793
/* Set the library compression level. Currently, valid values range from
1794
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1795
* (0 - no compression, 9 - "maximal" compression). Note that tests have
1796
* shown that zlib compression levels 3-6 usually perform as well as level 9
1797
* for PNG images, and do considerably fewer caclulations. In the future,
1798
* these values may not correspond directly to the zlib compression levels.
1800
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1803
extern PNG_EXPORT(void,png_set_compression_mem_level)
1804
PNGARG((png_structp png_ptr, int mem_level));
1806
extern PNG_EXPORT(void,png_set_compression_strategy)
1807
PNGARG((png_structp png_ptr, int strategy));
1809
extern PNG_EXPORT(void,png_set_compression_window_bits)
1810
PNGARG((png_structp png_ptr, int window_bits));
1812
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1815
/* These next functions are called for input/output, memory, and error
1816
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1817
* and call standard C I/O routines such as fread(), fwrite(), and
1818
* fprintf(). These functions can be made to use other I/O routines
1819
* at run time for those applications that need to handle I/O in a
1820
* different manner by calling png_set_???_fn(). See libpng.txt for
1824
#if !defined(PNG_NO_STDIO)
1825
/* Initialize the input/output for the PNG file to the default functions. */
1826
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
1829
/* Replace the (error and abort), and warning functions with user
1830
* supplied functions. If no messages are to be printed you must still
1831
* write and use replacement functions. The replacement error_fn should
1832
* still do a longjmp to the last setjmp location if you are using this
1833
* method of error handling. If error_fn or warning_fn is NULL, the
1834
* default function will be used.
1837
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1838
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1840
/* Return the user pointer associated with the error functions */
1841
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1843
/* Replace the default data output functions with a user supplied one(s).
1844
* If buffered output is not used, then output_flush_fn can be set to NULL.
1845
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1846
* output_flush_fn will be ignored (and thus can be NULL).
1848
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1849
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1851
/* Replace the default data input function with a user supplied one. */
1852
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1853
png_voidp io_ptr, png_rw_ptr read_data_fn));
1855
/* Return the user pointer associated with the I/O functions */
1856
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1858
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1859
png_read_status_ptr read_row_fn));
1861
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1862
png_write_status_ptr write_row_fn));
1864
#ifdef PNG_USER_MEM_SUPPORTED
1865
/* Replace the default memory allocation functions with user supplied one(s). */
1866
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1867
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1868
/* Return the user pointer associated with the memory functions */
1869
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
1872
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1873
defined(PNG_LEGACY_SUPPORTED)
1874
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
1875
png_ptr, png_user_transform_ptr read_user_transform_fn));
1878
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1879
defined(PNG_LEGACY_SUPPORTED)
1880
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
1881
png_ptr, png_user_transform_ptr write_user_transform_fn));
1884
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1885
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
1886
defined(PNG_LEGACY_SUPPORTED)
1887
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
1888
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
1889
int user_transform_channels));
1890
/* Return the user pointer associated with the user transform functions */
1891
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
1892
PNGARG((png_structp png_ptr));
1895
#ifdef PNG_USER_CHUNKS_SUPPORTED
1896
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
1897
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
1898
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
1902
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1903
/* Sets the function callbacks for the push reader, and a pointer to a
1904
* user-defined structure available to the callback functions.
1906
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
1907
png_voidp progressive_ptr,
1908
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
1909
png_progressive_end_ptr end_fn));
1911
/* returns the user pointer associated with the push read functions */
1912
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
1913
PNGARG((png_structp png_ptr));
1915
/* function to be called when data becomes available */
1916
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
1917
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
1919
/* function that combines rows. Not very much different than the
1920
* png_combine_row() call. Is this even used?????
1922
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
1923
png_bytep old_row, png_bytep new_row));
1924
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1926
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
1929
#if defined(PNG_1_0_X)
1930
# define png_malloc_warn png_malloc
1932
/* Added at libpng version 1.2.4 */
1933
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
1937
/* frees a pointer allocated by png_malloc() */
1938
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
1940
#if defined(PNG_1_0_X)
1941
/* Function to allocate memory for zlib. */
1942
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
1945
/* Function to free memory for zlib */
1946
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
1949
/* Free data that was allocated internally */
1950
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
1951
png_infop info_ptr, png_uint_32 free_me, int num));
1952
#ifdef PNG_FREE_ME_SUPPORTED
1953
/* Reassign responsibility for freeing existing data, whether allocated
1954
* by libpng or by the application */
1955
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
1956
png_infop info_ptr, int freer, png_uint_32 mask));
1958
/* assignments for png_data_freer */
1959
#define PNG_DESTROY_WILL_FREE_DATA 1
1960
#define PNG_SET_WILL_FREE_DATA 1
1961
#define PNG_USER_WILL_FREE_DATA 2
1962
/* Flags for png_ptr->free_me and info_ptr->free_me */
1963
#define PNG_FREE_HIST 0x0008
1964
#define PNG_FREE_ICCP 0x0010
1965
#define PNG_FREE_SPLT 0x0020
1966
#define PNG_FREE_ROWS 0x0040
1967
#define PNG_FREE_PCAL 0x0080
1968
#define PNG_FREE_SCAL 0x0100
1969
#define PNG_FREE_UNKN 0x0200
1970
#define PNG_FREE_LIST 0x0400
1971
#define PNG_FREE_PLTE 0x1000
1972
#define PNG_FREE_TRNS 0x2000
1973
#define PNG_FREE_TEXT 0x4000
1974
#define PNG_FREE_ALL 0x7fff
1975
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
1977
#ifdef PNG_USER_MEM_SUPPORTED
1978
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
1980
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
1984
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
1985
png_voidp s1, png_voidp s2, png_uint_32 size));
1987
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
1988
png_voidp s1, int value, png_uint_32 size));
1990
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
1991
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
1993
#endif /* USE_FAR_KEYWORD */
1995
/* Fatal error in PNG image of libpng - can't continue */
1996
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
1997
png_const_charp error_message));
1999
/* The same, but the chunk name is prepended to the error string. */
2000
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2001
png_const_charp error_message));
2003
/* Non-fatal error in libpng. Can continue, but may have a problem. */
2004
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2005
png_const_charp warning_message));
2007
/* Non-fatal error in libpng, chunk name is prepended to message. */
2008
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2009
png_const_charp warning_message));
2011
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
2012
* Similarly, the png_get_<chunk> calls are used to read values from the
2013
* png_info_struct, either storing the parameters in the passed variables, or
2014
* setting pointers into the png_info_struct where the data is stored. The
2015
* png_get_<chunk> functions return a non-zero value if the data was available
2016
* in info_ptr, or return zero and do not change any of the parameters if the
2017
* data was not available.
2019
* These functions should be used instead of directly accessing png_info
2020
* to avoid problems with future changes in the size and internal layout of
2023
/* Returns "flag" if chunk data is valid in info_ptr. */
2024
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2025
png_infop info_ptr, png_uint_32 flag));
2027
/* Returns number of bytes needed to hold a transformed row. */
2028
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
2029
png_infop info_ptr));
2031
#if defined(PNG_INFO_IMAGE_SUPPORTED)
2032
/* Returns row_pointers, which is an array of pointers to scanlines that was
2033
returned from png_read_png(). */
2034
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2035
png_infop info_ptr));
2036
/* Set row_pointers, which is an array of pointers to scanlines for use
2037
by png_write_png(). */
2038
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2039
png_infop info_ptr, png_bytepp row_pointers));
2042
/* Returns number of color channels in image. */
2043
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2044
png_infop info_ptr));
2046
#ifdef PNG_EASY_ACCESS_SUPPORTED
2047
/* Returns image width in pixels. */
2048
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2049
png_ptr, png_infop info_ptr));
2051
/* Returns image height in pixels. */
2052
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2053
png_ptr, png_infop info_ptr));
2055
/* Returns image bit_depth. */
2056
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2057
png_ptr, png_infop info_ptr));
2059
/* Returns image color_type. */
2060
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2061
png_ptr, png_infop info_ptr));
2063
/* Returns image filter_type. */
2064
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2065
png_ptr, png_infop info_ptr));
2067
/* Returns image interlace_type. */
2068
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2069
png_ptr, png_infop info_ptr));
2071
/* Returns image compression_type. */
2072
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2073
png_ptr, png_infop info_ptr));
2075
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
2076
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2077
png_ptr, png_infop info_ptr));
2078
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2079
png_ptr, png_infop info_ptr));
2080
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2081
png_ptr, png_infop info_ptr));
2083
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
2084
#ifdef PNG_FLOATING_POINT_SUPPORTED
2085
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2086
png_ptr, png_infop info_ptr));
2089
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2090
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2091
png_ptr, png_infop info_ptr));
2092
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2093
png_ptr, png_infop info_ptr));
2094
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2095
png_ptr, png_infop info_ptr));
2096
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2097
png_ptr, png_infop info_ptr));
2099
#endif /* PNG_EASY_ACCESS_SUPPORTED */
2101
/* Returns pointer to signature string read from PNG header */
2102
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2103
png_infop info_ptr));
2105
#if defined(PNG_bKGD_SUPPORTED)
2106
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2107
png_infop info_ptr, png_color_16p *background));
2110
#if defined(PNG_bKGD_SUPPORTED)
2111
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2112
png_infop info_ptr, png_color_16p background));
2115
#if defined(PNG_cHRM_SUPPORTED)
2116
#ifdef PNG_FLOATING_POINT_SUPPORTED
2117
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2118
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2119
double *red_y, double *green_x, double *green_y, double *blue_x,
2122
#ifdef PNG_FIXED_POINT_SUPPORTED
2123
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2124
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2125
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2126
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2127
*int_blue_x, png_fixed_point *int_blue_y));
2131
#if defined(PNG_cHRM_SUPPORTED)
2132
#ifdef PNG_FLOATING_POINT_SUPPORTED
2133
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2134
png_infop info_ptr, double white_x, double white_y, double red_x,
2135
double red_y, double green_x, double green_y, double blue_x, double blue_y));
2137
#ifdef PNG_FIXED_POINT_SUPPORTED
2138
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2139
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2140
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2141
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2142
png_fixed_point int_blue_y));
2146
#if defined(PNG_gAMA_SUPPORTED)
2147
#ifdef PNG_FLOATING_POINT_SUPPORTED
2148
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2149
png_infop info_ptr, double *file_gamma));
2151
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2152
png_infop info_ptr, png_fixed_point *int_file_gamma));
2155
#if defined(PNG_gAMA_SUPPORTED)
2156
#ifdef PNG_FLOATING_POINT_SUPPORTED
2157
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2158
png_infop info_ptr, double file_gamma));
2160
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2161
png_infop info_ptr, png_fixed_point int_file_gamma));
2164
#if defined(PNG_hIST_SUPPORTED)
2165
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2166
png_infop info_ptr, png_uint_16p *hist));
2169
#if defined(PNG_hIST_SUPPORTED)
2170
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2171
png_infop info_ptr, png_uint_16p hist));
2174
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2175
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2176
int *bit_depth, int *color_type, int *interlace_method,
2177
int *compression_method, int *filter_method));
2179
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2180
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2181
int color_type, int interlace_method, int compression_method,
2182
int filter_method));
2184
#if defined(PNG_oFFs_SUPPORTED)
2185
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2186
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2190
#if defined(PNG_oFFs_SUPPORTED)
2191
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2192
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2196
#if defined(PNG_pCAL_SUPPORTED)
2197
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2198
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2199
int *type, int *nparams, png_charp *units, png_charpp *params));
2202
#if defined(PNG_pCAL_SUPPORTED)
2203
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2204
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2205
int type, int nparams, png_charp units, png_charpp params));
2208
#if defined(PNG_pHYs_SUPPORTED)
2209
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2210
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2213
#if defined(PNG_pHYs_SUPPORTED)
2214
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2215
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2218
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2219
png_infop info_ptr, png_colorp *palette, int *num_palette));
2221
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2222
png_infop info_ptr, png_colorp palette, int num_palette));
2224
#if defined(PNG_sBIT_SUPPORTED)
2225
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2226
png_infop info_ptr, png_color_8p *sig_bit));
2229
#if defined(PNG_sBIT_SUPPORTED)
2230
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2231
png_infop info_ptr, png_color_8p sig_bit));
2234
#if defined(PNG_sRGB_SUPPORTED)
2235
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2236
png_infop info_ptr, int *intent));
2239
#if defined(PNG_sRGB_SUPPORTED)
2240
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2241
png_infop info_ptr, int intent));
2242
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2243
png_infop info_ptr, int intent));
2246
#if defined(PNG_iCCP_SUPPORTED)
2247
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2248
png_infop info_ptr, png_charpp name, int *compression_type,
2249
png_charpp profile, png_uint_32 *proflen));
2250
/* Note to maintainer: profile should be png_bytepp */
2253
#if defined(PNG_iCCP_SUPPORTED)
2254
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2255
png_infop info_ptr, png_charp name, int compression_type,
2256
png_charp profile, png_uint_32 proflen));
2257
/* Note to maintainer: profile should be png_bytep */
2260
#if defined(PNG_sPLT_SUPPORTED)
2261
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2262
png_infop info_ptr, png_sPLT_tpp entries));
2265
#if defined(PNG_sPLT_SUPPORTED)
2266
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2267
png_infop info_ptr, png_sPLT_tp entries, int nentries));
2270
#if defined(PNG_TEXT_SUPPORTED)
2271
/* png_get_text also returns the number of text chunks in *num_text */
2272
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2273
png_infop info_ptr, png_textp *text_ptr, int *num_text));
2277
* Note while png_set_text() will accept a structure whose text,
2278
* language, and translated keywords are NULL pointers, the structure
2279
* returned by png_get_text will always contain regular
2280
* zero-terminated C strings. They might be empty strings but
2281
* they will never be NULL pointers.
2284
#if defined(PNG_TEXT_SUPPORTED)
2285
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2286
png_infop info_ptr, png_textp text_ptr, int num_text));
2289
#if defined(PNG_tIME_SUPPORTED)
2290
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2291
png_infop info_ptr, png_timep *mod_time));
2294
#if defined(PNG_tIME_SUPPORTED)
2295
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2296
png_infop info_ptr, png_timep mod_time));
2299
#if defined(PNG_tRNS_SUPPORTED)
2300
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2301
png_infop info_ptr, png_bytep *trans, int *num_trans,
2302
png_color_16p *trans_values));
2305
#if defined(PNG_tRNS_SUPPORTED)
2306
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2307
png_infop info_ptr, png_bytep trans, int num_trans,
2308
png_color_16p trans_values));
2311
#if defined(PNG_tRNS_SUPPORTED)
2314
#if defined(PNG_sCAL_SUPPORTED)
2315
#ifdef PNG_FLOATING_POINT_SUPPORTED
2316
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2317
png_infop info_ptr, int *unit, double *width, double *height));
2319
#ifdef PNG_FIXED_POINT_SUPPORTED
2320
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2321
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2324
#endif /* PNG_sCAL_SUPPORTED */
2326
#if defined(PNG_sCAL_SUPPORTED)
2327
#ifdef PNG_FLOATING_POINT_SUPPORTED
2328
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2329
png_infop info_ptr, int unit, double width, double height));
2331
#ifdef PNG_FIXED_POINT_SUPPORTED
2332
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2333
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2335
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2337
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
2338
/* provide a list of chunks and how they are to be handled, if the built-in
2339
handling or default unknown chunk handling is not desired. Any chunks not
2340
listed will be handled in the default manner. The IHDR and IEND chunks
2342
keep = 0: follow default behavour
2344
= 2: keep only if safe-to-copy
2345
= 3: keep even if unsafe-to-copy
2347
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2348
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2349
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2350
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2351
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
2352
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2353
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2354
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2356
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2357
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2361
/* Png_free_data() will turn off the "valid" flag for anything it frees.
2362
If you need to turn it off for a chunk that your application has freed,
2363
you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
2364
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2365
png_infop info_ptr, int mask));
2367
#if defined(PNG_INFO_IMAGE_SUPPORTED)
2368
/* The "params" pointer is currently not used and is for future expansion. */
2369
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2373
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2379
/* Define PNG_DEBUG at compile time for debugging information. Higher
2380
* numbers for PNG_DEBUG mean more debugging information. This has
2381
* only been added since version 0.95 so it is not implemented throughout
2382
* libpng yet, but more support will be added as needed.
2386
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
2389
#define png_debug(l,m) _RPT0(_CRT_WARN,m)
2390
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
2391
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
2393
#else /* PNG_DEBUG_FILE || !_MSC_VER */
2394
#ifndef PNG_DEBUG_FILE
2395
#define PNG_DEBUG_FILE stderr
2396
#endif /* PNG_DEBUG_FILE */
2398
#define png_debug(l,m) \
2401
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2402
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
2404
#define png_debug1(l,m,p1) \
2407
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2408
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
2410
#define png_debug2(l,m,p1,p2) \
2413
fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
2414
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
2416
#endif /* (PNG_DEBUG > 1) */
2417
#endif /* _MSC_VER */
2418
#endif /* (PNG_DEBUG > 0) */
2419
#endif /* PNG_DEBUG */
2421
#define png_debug(l, m)
2424
#define png_debug1(l, m, p1)
2427
#define png_debug2(l, m, p1, p2)
2430
extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
2432
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2433
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2434
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
2435
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2437
#ifdef PNG_MNG_FEATURES_SUPPORTED
2438
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2439
png_ptr, png_uint_32 mng_features_permitted));
2442
/* For use in png_set_keep_unknown, added to version 1.2.6 */
2443
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2444
#define PNG_HANDLE_CHUNK_NEVER 1
2445
#define PNG_HANDLE_CHUNK_IF_SAFE 2
2446
#define PNG_HANDLE_CHUNK_ALWAYS 3
2448
/* Added to version 1.2.0 */
2449
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
2450
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
2451
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
2452
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
2453
#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
2454
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
2455
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
2456
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
2457
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
2458
#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
2460
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
2461
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
2462
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
2463
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
2464
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
2465
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
2466
#define PNG_MMX_WRITE_FLAGS ( 0 )
2468
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
2469
| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
2470
| PNG_MMX_READ_FLAGS \
2471
| PNG_MMX_WRITE_FLAGS )
2473
#define PNG_SELECT_READ 1
2474
#define PNG_SELECT_WRITE 2
2476
#if !defined(PNG_1_0_X)
2478
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
2479
PNGARG((int flag_select, int *compilerID));
2482
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
2483
PNGARG((int flag_select));
2486
extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
2487
PNGARG((png_structp png_ptr));
2490
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
2491
PNGARG((png_structp png_ptr));
2494
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
2495
PNGARG((png_structp png_ptr));
2498
extern PNG_EXPORT(void,png_set_asm_flags)
2499
PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
2502
extern PNG_EXPORT(void,png_set_mmx_thresholds)
2503
PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
2504
png_uint_32 mmx_rowbytes_threshold));
2506
#endif /* PNG_1_0_X */
2507
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
2509
#if !defined(PNG_1_0_X)
2510
/* png.c, pnggccrd.c, or pngvcrd.c */
2511
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
2513
/* Strip the prepended error numbers ("#nnn ") from error and warning
2514
* messages before passing them to the error or warning handler. */
2515
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2516
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2517
png_ptr, png_uint_32 strip_mode));
2520
#endif /* PNG_1_0_X */
2522
/* Added at libpng-1.2.6 */
2523
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
2524
extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2525
png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2526
extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2528
extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2532
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
2534
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2535
/* With these routines we avoid an integer divide, which will be slower on
2536
* most machines. However, it does take more operations than the corresponding
2537
* divide method, so it may be slower on a few RISC systems. There are two
2538
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2540
* Note that the rounding factors are NOT supposed to be the same! 128 and
2541
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2544
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2547
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2549
# define png_composite(composite, fg, alpha, bg) \
2550
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
2551
+ (png_uint_16)(bg)*(png_uint_16)(255 - \
2552
(png_uint_16)(alpha)) + (png_uint_16)128); \
2553
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2555
# define png_composite_16(composite, fg, alpha, bg) \
2556
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
2557
+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
2558
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
2559
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2561
#else /* standard method using integer division */
2563
# define png_composite(composite, fg, alpha, bg) \
2564
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2565
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2566
(png_uint_16)127) / 255)
2568
# define png_composite_16(composite, fg, alpha, bg) \
2569
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2570
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2571
(png_uint_32)32767) / (png_uint_32)65535L)
2573
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2575
/* These next functions are used internally in the code. They generally
2576
* shouldn't be used unless you are writing code to add or replace some
2577
* functionality in libpng. More information about most functions can
2578
* be found in the files where the functions are located.
2581
#if defined(PNG_INTERNAL)
2583
/* Various modes of operation. Note that after an init, mode is set to
2584
* zero automatically when the structure is created.
2586
#define PNG_HAVE_IHDR 0x01
2587
#define PNG_HAVE_PLTE 0x02
2588
#define PNG_HAVE_IDAT 0x04
2589
#define PNG_AFTER_IDAT 0x08
2590
#define PNG_HAVE_IEND 0x10
2591
#define PNG_HAVE_gAMA 0x20
2592
#define PNG_HAVE_cHRM 0x40
2593
#define PNG_HAVE_sRGB 0x80
2594
#define PNG_HAVE_CHUNK_HEADER 0x100
2595
#define PNG_WROTE_tIME 0x200
2596
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
2597
#define PNG_BACKGROUND_IS_GRAY 0x800
2598
#define PNG_HAVE_PNG_SIGNATURE 0x1000
2600
/* flags for the transformations the PNG library does on the image data */
2601
#define PNG_BGR 0x0001
2602
#define PNG_INTERLACE 0x0002
2603
#define PNG_PACK 0x0004
2604
#define PNG_SHIFT 0x0008
2605
#define PNG_SWAP_BYTES 0x0010
2606
#define PNG_INVERT_MONO 0x0020
2607
#define PNG_DITHER 0x0040
2608
#define PNG_BACKGROUND 0x0080
2609
#define PNG_BACKGROUND_EXPAND 0x0100
2611
#define PNG_16_TO_8 0x0400
2612
#define PNG_RGBA 0x0800
2613
#define PNG_EXPAND 0x1000
2614
#define PNG_GAMMA 0x2000
2615
#define PNG_GRAY_TO_RGB 0x4000
2616
#define PNG_FILLER 0x8000L
2617
#define PNG_PACKSWAP 0x10000L
2618
#define PNG_SWAP_ALPHA 0x20000L
2619
#define PNG_STRIP_ALPHA 0x40000L
2620
#define PNG_INVERT_ALPHA 0x80000L
2621
#define PNG_USER_TRANSFORM 0x100000L
2622
#define PNG_RGB_TO_GRAY_ERR 0x200000L
2623
#define PNG_RGB_TO_GRAY_WARN 0x400000L
2624
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
2625
/* 0x800000L Unused */
2626
#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
2627
/* 0x2000000L unused */
2628
/* 0x4000000L unused */
2629
/* 0x8000000L unused */
2630
/* 0x10000000L unused */
2631
/* 0x20000000L unused */
2632
/* 0x40000000L unused */
2634
/* flags for png_create_struct */
2635
#define PNG_STRUCT_PNG 0x0001
2636
#define PNG_STRUCT_INFO 0x0002
2638
/* Scaling factor for filter heuristic weighting calculations */
2639
#define PNG_WEIGHT_SHIFT 8
2640
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
2641
#define PNG_COST_SHIFT 3
2642
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
2644
/* flags for the png_ptr->flags rather than declaring a byte for each one */
2645
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
2646
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
2647
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
2648
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
2649
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
2650
#define PNG_FLAG_ZLIB_FINISHED 0x0020
2651
#define PNG_FLAG_ROW_INIT 0x0040
2652
#define PNG_FLAG_FILLER_AFTER 0x0080
2653
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
2654
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
2655
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
2656
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
2657
#define PNG_FLAG_FREE_PLTE 0x1000
2658
#define PNG_FLAG_FREE_TRNS 0x2000
2659
#define PNG_FLAG_FREE_HIST 0x4000
2660
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
2661
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
2662
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
2663
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
2664
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
2665
#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
2666
#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
2667
#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
2668
/* 0x800000L unused */
2669
/* 0x1000000L unused */
2670
/* 0x2000000L unused */
2671
/* 0x4000000L unused */
2672
/* 0x8000000L unused */
2673
/* 0x10000000L unused */
2674
/* 0x20000000L unused */
2675
/* 0x40000000L unused */
2677
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
2678
PNG_FLAG_CRC_ANCILLARY_NOWARN)
2680
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
2681
PNG_FLAG_CRC_CRITICAL_IGNORE)
2683
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
2684
PNG_FLAG_CRC_CRITICAL_MASK)
2686
/* save typing and make code easier to understand */
2688
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
2689
abs((int)((c1).green) - (int)((c2).green)) + \
2690
abs((int)((c1).blue) - (int)((c2).blue)))
2692
/* Added to libpng-1.2.6 JB */
2693
#define PNG_ROWBYTES(pixel_bits, width) \
2694
((pixel_bits) >= 8 ? \
2695
((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
2696
(( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
2698
/* PNG_OUT_OF_RANGE returns true if value is outside the range
2699
ideal-delta..ideal+delta. Each argument is evaluated twice.
2700
"ideal" and "delta" should be constants, normally simple
2701
integers, "value" a variable. Added to libpng-1.2.6 JB */
2702
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
2703
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
2705
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
2706
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
2707
/* place to hold the signature string for a PNG file. */
2708
#ifdef PNG_USE_GLOBAL_ARRAYS
2709
PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8];
2711
#define png_sig png_sig_bytes(NULL)
2713
#endif /* PNG_NO_EXTERN */
2715
/* Constant strings for known chunk types. If you need to add a chunk,
2716
* define the name here, and add an invocation of the macro in png.c and
2717
* wherever it's needed.
2719
#define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
2720
#define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
2721
#define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
2722
#define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
2723
#define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
2724
#define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
2725
#define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
2726
#define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
2727
#define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
2728
#define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
2729
#define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
2730
#define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
2731
#define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
2732
#define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
2733
#define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
2734
#define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
2735
#define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
2736
#define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
2737
#define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
2738
#define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
2739
#define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
2741
#ifdef PNG_USE_GLOBAL_ARRAYS
2742
PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5];
2743
PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5];
2744
PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5];
2745
PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5];
2746
PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5];
2747
PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5];
2748
PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5];
2749
PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5];
2750
PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5];
2751
PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5];
2752
PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5];
2753
PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5];
2754
PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5];
2755
PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5];
2756
PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5];
2757
PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5];
2758
PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5];
2759
PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5];
2760
PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5];
2761
PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5];
2762
PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
2763
#endif /* PNG_USE_GLOBAL_ARRAYS */
2766
/* Inline macros to do direct reads of bytes from the input buffer. These
2767
* require that you are using an architecture that uses PNG byte ordering
2768
* (MSB first) and supports unaligned data storage. I think that PowerPC
2769
* in big-endian mode and 680x0 are the only ones that will support this.
2770
* The x86 line of processors definitely do not. The png_get_int_32()
2771
* routine also assumes we are using two's complement format for negative
2772
* values, which is almost certainly true.
2774
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
2775
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
2776
# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
2778
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
2779
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
2781
# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
2782
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
2784
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
2785
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
2786
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
2787
PNG_EXTERN png_uint_32 png_get_uint_31 PNGARG((png_structp png_ptr,
2790
/* Initialize png_ptr struct for reading, and allocate any other memory.
2791
* (old interface - DEPRECATED - use png_create_read_struct instead).
2793
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
2794
#undef png_read_init
2795
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
2796
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2797
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
2798
png_const_charp user_png_ver, png_size_t png_struct_size));
2799
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
2800
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2803
/* Initialize png_ptr struct for writing, and allocate any other memory.
2804
* (old interface - DEPRECATED - use png_create_write_struct instead).
2806
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
2807
#undef png_write_init
2808
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
2809
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
2810
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
2811
png_const_charp user_png_ver, png_size_t png_struct_size));
2812
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
2813
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
2816
/* Allocate memory for an internal libpng struct */
2817
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
2819
/* Free memory from internal libpng struct */
2820
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
2822
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
2823
malloc_fn, png_voidp mem_ptr));
2824
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
2825
png_free_ptr free_fn, png_voidp mem_ptr));
2827
/* Free any memory that info_ptr points to and reset struct. */
2828
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
2829
png_infop info_ptr));
2832
/* Function to allocate memory for zlib. */
2833
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
2835
/* Function to free memory for zlib */
2836
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
2839
/* Function to convert a sizeof an item to png_sizeof item */
2840
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
2843
/* Next four functions are used internally as callbacks. PNGAPI is required
2844
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
2846
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
2847
png_bytep data, png_size_t length));
2849
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2850
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
2851
png_bytep buffer, png_size_t length));
2854
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
2855
png_bytep data, png_size_t length));
2857
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2858
#if !defined(PNG_NO_STDIO)
2859
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
2862
#else /* PNG_1_0_X */
2863
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2864
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
2865
png_bytep buffer, png_size_t length));
2867
#endif /* PNG_1_0_X */
2869
/* Reset the CRC variable */
2870
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
2872
/* Write the "data" buffer to whatever output you are using. */
2873
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
2874
png_size_t length));
2876
/* Read data from whatever input you are using into the "data" buffer */
2877
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
2878
png_size_t length));
2880
/* Read bytes into buf, and update png_ptr->crc */
2881
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
2882
png_size_t length));
2884
/* Decompress data in a chunk that uses compression */
2885
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
2886
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
2887
PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
2888
int comp_type, png_charp chunkdata, png_size_t chunklength,
2889
png_size_t prefix_length, png_size_t *data_length));
2892
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
2893
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
2895
/* Read the CRC from the file and compare it to the libpng calculated CRC */
2896
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
2898
/* Calculate the CRC over a section of data. Note that we are only
2899
* passing a maximum of 64K on systems that have this as a memory limit,
2900
* since this is the maximum buffer size we can specify.
2902
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
2903
png_size_t length));
2905
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
2906
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
2910
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
2911
* The only currently known PNG chunks that use signed numbers are
2912
* the ancillary extension chunks, oFFs and pCAL.
2914
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
2916
#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
2917
PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
2920
/* Place a 16-bit number into a buffer in PNG byte order.
2921
* The parameter is declared unsigned int, not png_uint_16,
2922
* just to avoid potential problems on pre-ANSI C compilers.
2924
PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
2926
/* simple function to write the signature */
2927
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
2929
/* write various chunks */
2931
/* Write the IHDR chunk, and update the png_struct with the necessary
2934
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
2936
int bit_depth, int color_type, int compression_method, int filter_method,
2937
int interlace_method));
2939
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
2940
png_uint_32 num_pal));
2942
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
2943
png_size_t length));
2945
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
2947
#if defined(PNG_WRITE_gAMA_SUPPORTED)
2948
#ifdef PNG_FLOATING_POINT_SUPPORTED
2949
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
2951
#ifdef PNG_FIXED_POINT_SUPPORTED
2952
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
2957
#if defined(PNG_WRITE_sBIT_SUPPORTED)
2958
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
2962
#if defined(PNG_WRITE_cHRM_SUPPORTED)
2963
#ifdef PNG_FLOATING_POINT_SUPPORTED
2964
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
2965
double white_x, double white_y,
2966
double red_x, double red_y, double green_x, double green_y,
2967
double blue_x, double blue_y));
2969
#ifdef PNG_FIXED_POINT_SUPPORTED
2970
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
2971
png_fixed_point int_white_x, png_fixed_point int_white_y,
2972
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2973
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2974
png_fixed_point int_blue_y));
2978
#if defined(PNG_WRITE_sRGB_SUPPORTED)
2979
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
2983
#if defined(PNG_WRITE_iCCP_SUPPORTED)
2984
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
2985
png_charp name, int compression_type,
2986
png_charp profile, int proflen));
2987
/* Note to maintainer: profile should be png_bytep */
2990
#if defined(PNG_WRITE_sPLT_SUPPORTED)
2991
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
2992
png_sPLT_tp palette));
2995
#if defined(PNG_WRITE_tRNS_SUPPORTED)
2996
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
2997
png_color_16p values, int number, int color_type));
3000
#if defined(PNG_WRITE_bKGD_SUPPORTED)
3001
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
3002
png_color_16p values, int color_type));
3005
#if defined(PNG_WRITE_hIST_SUPPORTED)
3006
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
3010
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
3011
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
3012
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
3013
png_charp key, png_charpp new_key));
3016
#if defined(PNG_WRITE_tEXt_SUPPORTED)
3017
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
3018
png_charp text, png_size_t text_len));
3021
#if defined(PNG_WRITE_zTXt_SUPPORTED)
3022
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
3023
png_charp text, png_size_t text_len, int compression));
3026
#if defined(PNG_WRITE_iTXt_SUPPORTED)
3027
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
3028
int compression, png_charp key, png_charp lang, png_charp lang_key,
3032
#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
3033
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
3034
png_infop info_ptr, png_textp text_ptr, int num_text));
3037
#if defined(PNG_WRITE_oFFs_SUPPORTED)
3038
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
3039
png_int_32 x_offset, png_int_32 y_offset, int unit_type));
3042
#if defined(PNG_WRITE_pCAL_SUPPORTED)
3043
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
3044
png_int_32 X0, png_int_32 X1, int type, int nparams,
3045
png_charp units, png_charpp params));
3048
#if defined(PNG_WRITE_pHYs_SUPPORTED)
3049
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
3050
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
3054
#if defined(PNG_WRITE_tIME_SUPPORTED)
3055
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
3056
png_timep mod_time));
3059
#if defined(PNG_WRITE_sCAL_SUPPORTED)
3060
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
3061
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
3062
int unit, double width, double height));
3064
#ifdef PNG_FIXED_POINT_SUPPORTED
3065
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
3066
int unit, png_charp width, png_charp height));
3071
/* Called when finished processing a row of data */
3072
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
3074
/* Internal use only. Called before first row of data */
3075
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
3077
#if defined(PNG_READ_GAMMA_SUPPORTED)
3078
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
3081
/* combine a row of data, dealing with alpha, etc. if requested */
3082
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
3085
#if defined(PNG_READ_INTERLACING_SUPPORTED)
3086
/* expand an interlaced row */
3087
/* OLD pre-1.0.9 interface:
3088
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
3089
png_bytep row, int pass, png_uint_32 transformations));
3091
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
3094
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
3096
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
3097
/* grab pixels out of a row for an interlaced pass */
3098
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
3099
png_bytep row, int pass));
3102
/* unfilter a row */
3103
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
3104
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
3106
/* Choose the best filter to use and filter the row data */
3107
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
3108
png_row_infop row_info));
3110
/* Write out the filtered row. */
3111
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
3112
png_bytep filtered_row));
3113
/* finish a row while reading, dealing with interlacing passes, etc. */
3114
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
3116
/* initialize the row buffers, etc. */
3117
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
3118
/* optional call to update the users info structure */
3119
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
3120
png_infop info_ptr));
3122
/* these are the functions that do the transformations */
3123
#if defined(PNG_READ_FILLER_SUPPORTED)
3124
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
3125
png_bytep row, png_uint_32 filler, png_uint_32 flags));
3128
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
3129
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
3133
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
3134
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
3138
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
3139
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
3143
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
3144
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
3148
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
3149
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
3150
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
3151
png_bytep row, png_uint_32 flags));
3154
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
3155
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
3158
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
3159
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
3162
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
3163
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
3164
row_info, png_bytep row));
3167
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
3168
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
3172
#if defined(PNG_READ_PACK_SUPPORTED)
3173
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
3176
#if defined(PNG_READ_SHIFT_SUPPORTED)
3177
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
3178
png_color_8p sig_bits));
3181
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
3182
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
3185
#if defined(PNG_READ_16_TO_8_SUPPORTED)
3186
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
3189
#if defined(PNG_READ_DITHER_SUPPORTED)
3190
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
3191
png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
3193
# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
3194
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
3195
png_colorp palette, int num_palette));
3199
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
3200
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
3203
#if defined(PNG_WRITE_PACK_SUPPORTED)
3204
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
3205
png_bytep row, png_uint_32 bit_depth));
3208
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
3209
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
3210
png_color_8p bit_depth));
3213
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
3214
#if defined(PNG_READ_GAMMA_SUPPORTED)
3215
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3216
png_color_16p trans_values, png_color_16p background,
3217
png_color_16p background_1,
3218
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
3219
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
3220
png_uint_16pp gamma_16_to_1, int gamma_shift));
3222
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
3223
png_color_16p trans_values, png_color_16p background));
3227
#if defined(PNG_READ_GAMMA_SUPPORTED)
3228
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
3229
png_bytep gamma_table, png_uint_16pp gamma_16_table,
3233
#if defined(PNG_READ_EXPAND_SUPPORTED)
3234
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
3235
png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
3236
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
3237
png_bytep row, png_color_16p trans_value));
3240
/* The following decodes the appropriate chunks, and does error correction,
3241
* then calls the appropriate callback for the chunk if it is valid.
3244
/* decode the IHDR chunk */
3245
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
3246
png_uint_32 length));
3247
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
3248
png_uint_32 length));
3249
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
3250
png_uint_32 length));
3252
#if defined(PNG_READ_bKGD_SUPPORTED)
3253
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
3254
png_uint_32 length));
3257
#if defined(PNG_READ_cHRM_SUPPORTED)
3258
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
3259
png_uint_32 length));
3262
#if defined(PNG_READ_gAMA_SUPPORTED)
3263
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
3264
png_uint_32 length));
3267
#if defined(PNG_READ_hIST_SUPPORTED)
3268
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
3269
png_uint_32 length));
3272
#if defined(PNG_READ_iCCP_SUPPORTED)
3273
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
3274
png_uint_32 length));
3275
#endif /* PNG_READ_iCCP_SUPPORTED */
3277
#if defined(PNG_READ_iTXt_SUPPORTED)
3278
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3279
png_uint_32 length));
3282
#if defined(PNG_READ_oFFs_SUPPORTED)
3283
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
3284
png_uint_32 length));
3287
#if defined(PNG_READ_pCAL_SUPPORTED)
3288
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3289
png_uint_32 length));
3292
#if defined(PNG_READ_pHYs_SUPPORTED)
3293
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
3294
png_uint_32 length));
3297
#if defined(PNG_READ_sBIT_SUPPORTED)
3298
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
3299
png_uint_32 length));
3302
#if defined(PNG_READ_sCAL_SUPPORTED)
3303
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
3304
png_uint_32 length));
3307
#if defined(PNG_READ_sPLT_SUPPORTED)
3308
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
3309
png_uint_32 length));
3310
#endif /* PNG_READ_sPLT_SUPPORTED */
3312
#if defined(PNG_READ_sRGB_SUPPORTED)
3313
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
3314
png_uint_32 length));
3317
#if defined(PNG_READ_tEXt_SUPPORTED)
3318
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3319
png_uint_32 length));
3322
#if defined(PNG_READ_tIME_SUPPORTED)
3323
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
3324
png_uint_32 length));
3327
#if defined(PNG_READ_tRNS_SUPPORTED)
3328
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
3329
png_uint_32 length));
3332
#if defined(PNG_READ_zTXt_SUPPORTED)
3333
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
3334
png_uint_32 length));
3337
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
3338
png_infop info_ptr, png_uint_32 length));
3340
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
3341
png_bytep chunk_name));
3343
/* handle the transformations for reading and writing */
3344
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
3345
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
3347
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
3349
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
3350
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
3351
png_infop info_ptr));
3352
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
3353
png_infop info_ptr));
3354
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
3355
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
3356
png_uint_32 length));
3357
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
3358
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
3359
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
3360
png_bytep buffer, png_size_t buffer_length));
3361
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
3362
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
3363
png_bytep buffer, png_size_t buffer_length));
3364
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
3365
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
3366
png_infop info_ptr, png_uint_32 length));
3367
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
3368
png_infop info_ptr));
3369
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
3370
png_infop info_ptr));
3371
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
3372
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
3373
png_infop info_ptr));
3374
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
3375
png_infop info_ptr));
3376
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
3377
#if defined(PNG_READ_tEXt_SUPPORTED)
3378
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
3379
png_infop info_ptr, png_uint_32 length));
3380
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
3381
png_infop info_ptr));
3383
#if defined(PNG_READ_zTXt_SUPPORTED)
3384
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
3385
png_infop info_ptr, png_uint_32 length));
3386
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
3387
png_infop info_ptr));
3389
#if defined(PNG_READ_iTXt_SUPPORTED)
3390
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
3391
png_infop info_ptr, png_uint_32 length));
3392
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
3393
png_infop info_ptr));
3396
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
3398
#ifdef PNG_MNG_FEATURES_SUPPORTED
3399
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
3401
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
3405
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
3406
/* png.c */ /* PRIVATE */
3407
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
3409
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
3411
#endif /* PNG_INTERNAL */
3417
#endif /* PNG_VERSION_INFO_ONLY */
3418
/* do not put anything past this line */
added
removed
src/3rdparty/libpng/png.h
