misc/winutils/include/png.h
author Wuzzy <Wuzzy2@mail.ru>
Tue, 04 Sep 2018 22:18:03 +0200
changeset 13763 29abd3d5f9bb
parent 7889 57b117d441b9
permissions -rw-r--r--
Call EndTurn(true) instead of TurnTimeLeft(0) in flying saucer training
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/* png.h - header file for PNG reference library
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 *
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 * libpng version 1.5.13 - September 27, 2012
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 * Copyright (c) 1998-2012 Glenn Randers-Pehrson
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 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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 *
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 * This code is released under the libpng license (See LICENSE, below)
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 *
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 * Authors and maintainers:
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 *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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 *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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 *   libpng versions 0.97, January 1998, through 1.5.13 - September 27, 2012: Glenn
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 *   See also "Contributing Authors", below.
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 *
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 * Note about libpng version numbers:
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 *
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 *   Due to various miscommunications, unforeseen code incompatibilities
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 *   and occasional factors outside the authors' control, version numbering
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 *   on the library has not always been consistent and straightforward.
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 *   The following table summarizes matters since version 0.89c, which was
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 *   the first widely used release:
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 *
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 *    source                 png.h  png.h  shared-lib
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 *    version                string   int  version
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 *    -------                ------ -----  ----------
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 *    0.89c "1.0 beta 3"     0.89      89  1.0.89
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 *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
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 *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
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 *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
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 *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
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 *    0.97c                  0.97      97  2.0.97
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 *    0.98                   0.98      98  2.0.98
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 *    0.99                   0.99      98  2.0.99
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 *    0.99a-m                0.99      99  2.0.99
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 *    1.00                   1.00     100  2.1.0 [100 should be 10000]
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 *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
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 *    1.0.1       png.h string is   10001  2.1.0
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 *    1.0.1a-e    identical to the  10002  from here on, the shared library
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 *    1.0.2       source version)   10002  is 2.V where V is the source code
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 *    1.0.2a-b                      10003  version, except as noted.
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 *    1.0.3                         10003
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 *    1.0.3a-d                      10004
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 *    1.0.4                         10004
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 *    1.0.4a-f                      10005
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 *    1.0.5 (+ 2 patches)           10005
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 *    1.0.5a-d                      10006
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 *    1.0.5e-r                      10100 (not source compatible)
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 *    1.0.5s-v                      10006 (not binary compatible)
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 *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
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 *    1.0.6d-f                      10007 (still binary incompatible)
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 *    1.0.6g                        10007
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 *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
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 *    1.0.6i                        10007  10.6i
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 *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
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 *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
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 *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
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 *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
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 *    1.0.7                    1    10007  (still compatible)
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 *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
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 *    1.5.0                   15    10500  15.so.15.0[.0]
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 *    1.5.1beta01-11          15    10501  15.so.15.1[.0]
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 *    1.5.1rc01-02            15    10501  15.so.15.1[.0]
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 *    1.5.1                   15    10501  15.so.15.1[.0]
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 *    1.5.2beta01-03          15    10502  15.so.15.2[.0]
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 *    1.5.2rc01-03            15    10502  15.so.15.2[.0]
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 *    1.5.2                   15    10502  15.so.15.2[.0]
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 *    1.5.3beta01-10          15    10503  15.so.15.3[.0]
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 *    1.5.3rc01-02            15    10503  15.so.15.3[.0]
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 *    1.5.3beta11             15    10503  15.so.15.3[.0]
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 *    1.5.3 [omitted]
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 *    1.5.4beta01-08          15    10504  15.so.15.4[.0]
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 *    1.5.4rc01               15    10504  15.so.15.4[.0]
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 *    1.5.4                   15    10504  15.so.15.4[.0]
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 *    1.5.5beta01-08          15    10505  15.so.15.5[.0]
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 *    1.5.5rc01               15    10505  15.so.15.5[.0]
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 *    1.5.5                   15    10505  15.so.15.5[.0]
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 *    1.5.6beta01-07          15    10506  15.so.15.6[.0]
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 *    1.5.6rc01-03            15    10506  15.so.15.6[.0]
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 *    1.5.6                   15    10506  15.so.15.6[.0]
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 *    1.5.7beta01-05          15    10507  15.so.15.7[.0]
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 *    1.5.7rc01-03            15    10507  15.so.15.7[.0]
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 *    1.5.7                   15    10507  15.so.15.7[.0]
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 *    1.5.8beta01             15    10508  15.so.15.8[.0]
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 *    1.5.8rc01               15    10508  15.so.15.8[.0]
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 *    1.5.8                   15    10508  15.so.15.8[.0]
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 *    1.5.9beta01-02          15    10509  15.so.15.9[.0]
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 *    1.5.9rc01               15    10509  15.so.15.9[.0]
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 *    1.5.9                   15    10509  15.so.15.9[.0]
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 *    1.5.10beta01-05         15    10510  15.so.15.10[.0]
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 *    1.5.10                  15    10510  15.so.15.10[.0]
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 *    1.5.11beta01            15    10511  15.so.15.11[.0]
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 *    1.5.11rc01-05           15    10511  15.so.15.11[.0]
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 *    1.5.11                  15    10511  15.so.15.11[.0]
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 *    1.5.12                  15    10512  15.so.15.12[.0]
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 *    1.5.13beta01-02         15    10513  15.so.15.13[.0]
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 *    1.5.13rc01              15    10513  15.so.15.13[.0]
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 *    1.5.13                  15    10513  15.so.15.13[.0]
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 *
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 *   Henceforth the source version will match the shared-library major
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 *   and minor numbers; the shared-library major version number will be
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 *   used for changes in backward compatibility, as it is intended.  The
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 *   PNG_LIBPNG_VER macro, which is not used within libpng but is available
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 *   for applications, is an unsigned integer of the form xyyzz corresponding
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 *   to the source version x.y.z (leading zeros in y and z).  Beta versions
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 *   were given the previous public release number plus a letter, until
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 *   version 1.0.6j; from then on they were given the upcoming public
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 *   release number plus "betaNN" or "rcNN".
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 *
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 *   Binary incompatibility exists only when applications make direct access
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 *   to the info_ptr or png_ptr members through png.h, and the compiled
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 *   application is loaded with a different version of the library.
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 *
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 *   DLLNUM will change each time there are forward or backward changes
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 *   in binary compatibility (e.g., when a new feature is added).
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 *
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 * See libpng-manual.txt or libpng.3 for more information.  The PNG
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 * specification is available as a W3C Recommendation and as an ISO
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 * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
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 */
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/*
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 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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 *
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 * If you modify libpng you may insert additional notices immediately following
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 * this sentence.
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 *
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 * This code is released under the libpng license.
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 *
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 * libpng versions 1.2.6, August 15, 2004, through 1.5.13, September 27, 2012, are
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 * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
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 * distributed according to the same disclaimer and license as libpng-1.2.5
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 * with the following individual added to the list of Contributing Authors:
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 *
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 *    Cosmin Truta
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 *
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 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
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 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
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 * distributed according to the same disclaimer and license as libpng-1.0.6
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 * with the following individuals added to the list of Contributing Authors:
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 *
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 *    Simon-Pierre Cadieux
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 *    Eric S. Raymond
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 *    Gilles Vollant
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 *
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 * and with the following additions to the disclaimer:
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 *
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 *    There is no warranty against interference with your enjoyment of the
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 *    library or against infringement.  There is no warranty that our
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 *    efforts or the library will fulfill any of your particular purposes
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 *    or needs.  This library is provided with all faults, and the entire
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 *    risk of satisfactory quality, performance, accuracy, and effort is with
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 *    the user.
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 *
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 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
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 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
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 * distributed according to the same disclaimer and license as libpng-0.96,
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 * with the following individuals added to the list of Contributing Authors:
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 *
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 *    Tom Lane
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 *    Glenn Randers-Pehrson
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 *    Willem van Schaik
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 *
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 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
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 * Copyright (c) 1996, 1997 Andreas Dilger
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 * Distributed according to the same disclaimer and license as libpng-0.88,
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 * with the following individuals added to the list of Contributing Authors:
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 *
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 *    John Bowler
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 *    Kevin Bracey
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 *    Sam Bushell
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 *    Magnus Holmgren
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 *    Greg Roelofs
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 *    Tom Tanner
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 *
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 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
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 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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 *
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 * For the purposes of this copyright and license, "Contributing Authors"
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 * is defined as the following set of individuals:
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 *
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 *    Andreas Dilger
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 *    Dave Martindale
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 *    Guy Eric Schalnat
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 *    Paul Schmidt
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 *    Tim Wegner
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 *
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 * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
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 * and Group 42, Inc. disclaim all warranties, expressed or implied,
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 * including, without limitation, the warranties of merchantability and of
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 * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
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 * assume no liability for direct, indirect, incidental, special, exemplary,
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 * or consequential damages, which may result from the use of the PNG
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 * Reference Library, even if advised of the possibility of such damage.
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 *
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 * Permission is hereby granted to use, copy, modify, and distribute this
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 * source code, or portions hereof, for any purpose, without fee, subject
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 * to the following restrictions:
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 *
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 *   1. The origin of this source code must not be misrepresented.
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 *
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 *   2. Altered versions must be plainly marked as such and must not
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 *      be misrepresented as being the original source.
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 *
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 *   3. This Copyright notice may not be removed or altered from
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 *      any source or altered source distribution.
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 *
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 * The Contributing Authors and Group 42, Inc. specifically permit, without
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 * fee, and encourage the use of this source code as a component to
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 * supporting the PNG file format in commercial products.  If you use this
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 * source code in a product, acknowledgment is not required but would be
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 * appreciated.
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 */
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/*
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 * A "png_get_copyright" function is available, for convenient use in "about"
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 * boxes and the like:
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 *
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 *     printf("%s", png_get_copyright(NULL));
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 *
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 * Also, the PNG logo (in PNG format, of course) is supplied in the
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 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
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 */
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/*
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 * Libpng is OSI Certified Open Source Software.  OSI Certified is a
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 * certification mark of the Open Source Initiative.
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 */
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/*
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 * The contributing authors would like to thank all those who helped
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 * with testing, bug fixes, and patience.  This wouldn't have been
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 * possible without all of you.
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 *
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 * Thanks to Frank J. T. Wojcik for helping with the documentation.
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 */
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/*
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 * Y2K compliance in libpng:
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 * =========================
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 *
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 *    September 27, 2012
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 *
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 *    Since the PNG Development group is an ad-hoc body, we can't make
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 *    an official declaration.
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 *
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 *    This is your unofficial assurance that libpng from version 0.71 and
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 *    upward through 1.5.13 are Y2K compliant.  It is my belief that
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 *    earlier versions were also Y2K compliant.
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 *
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 *    Libpng only has two year fields.  One is a 2-byte unsigned integer
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 *    that will hold years up to 65535.  The other holds the date in text
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 *    format, and will hold years up to 9999.
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 *
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 *    The integer is
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 *        "png_uint_16 year" in png_time_struct.
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 *
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 *    The string is
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 *        "char time_buffer[29]" in png_struct.  This will be no
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 *    longer used in libpng-1.6.0 and will be removed from libpng-1.7.0.
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 *
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 *    There are seven time-related functions:
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 *        png.c: png_convert_to_rfc_1123() in png.c
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 *          (formerly png_convert_to_rfc_1152() in error)
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 *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
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 *        png_convert_from_time_t() in pngwrite.c
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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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 *
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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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 *
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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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 *
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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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 *
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 *       Glenn Randers-Pehrson
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 *       libpng maintainer
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 *       PNG Development Group
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 */
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   378
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   379
#ifndef PNG_H
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#define PNG_H
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   381
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   382
/* This is not the place to learn how to use libpng. The file libpng-manual.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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   386
 *
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 * If you just need to read a PNG file and don't want to read the documentation
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 * skip to the end of this file and read the section entitled 'simplified API'.
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 */
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   390
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   391
/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.5.13"
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#define PNG_HEADER_VERSION_STRING \
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     " libpng version 1.5.13 - September 27, 2012\n"
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   395
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#define PNG_LIBPNG_VER_SONUM   15
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#define PNG_LIBPNG_VER_DLLNUM  15
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   398
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   399
/* 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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   401
#define PNG_LIBPNG_VER_MINOR   5
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   402
#define PNG_LIBPNG_VER_RELEASE 13
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   403
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   404
/* This should match the numeric part of the final component of
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   405
 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
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 */
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   407
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   408
#define PNG_LIBPNG_VER_BUILD  0
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   409
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   410
/* Release Status */
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   411
#define PNG_LIBPNG_BUILD_ALPHA    1
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   412
#define PNG_LIBPNG_BUILD_BETA     2
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   413
#define PNG_LIBPNG_BUILD_RC       3
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   414
#define PNG_LIBPNG_BUILD_STABLE   4
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#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
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   416
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   417
/* Release-Specific Flags */
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   418
#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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   422
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
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                                       PNG_LIBPNG_BUILD_PRIVATE */
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   424
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#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
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   426
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   427
/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
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   428
 * We must not include leading zeros.
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   429
 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
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   430
 * 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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 */
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#define PNG_LIBPNG_VER 10513 /* 1.5.13 */
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   434
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   435
/* Library configuration: these options cannot be changed after
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 * the library has been built.
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 */
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#ifndef PNGLCONF_H
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   439
    /* If pnglibconf.h is missing, you can
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     * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
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   441
     */
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#   include "pnglibconf.h"
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#endif
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   444
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#ifndef PNG_VERSION_INFO_ONLY
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#  ifndef PNG_BUILDING_SYMBOL_TABLE
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  /*
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   448
   *   Standard header files (not needed for the version info or while
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   449
   *   building symbol table -- see scripts/pnglibconf.dfa)
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   */
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#    ifdef PNG_SETJMP_SUPPORTED
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#      include <setjmp.h>
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   453
#    endif
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   454
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   455
    /* Need the time information for converting tIME chunks, it
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     * defines struct tm:
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   457
     */
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   458
#    ifdef PNG_CONVERT_tIME_SUPPORTED
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   459
       /* "time.h" functions are not supported on all operating systems */
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#      include <time.h>
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   461
#    endif
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   462
#  endif
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   463
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   464
/* Machine specific configuration. */
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   465
#  include "pngconf.h"
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   466
#endif
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   467
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   468
/*
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diff changeset
   469
 * Added at libpng-1.2.8
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   470
 *
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diff changeset
   471
 * Ref MSDN: Private as priority over Special
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diff changeset
   472
 * VS_FF_PRIVATEBUILD File *was not* built using standard release
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   473
 * procedures. If this value is given, the StringFileInfo block must
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 * contain a PrivateBuild string.
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   475
 *
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diff changeset
   476
 * VS_FF_SPECIALBUILD File *was* built by the original company using
57b117d441b9 consistent line endings
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   477
 * standard release procedures but is a variation of the standard
57b117d441b9 consistent line endings
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   478
 * file of the same version number. If this value is given, the
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diff changeset
   479
 * StringFileInfo block must contain a SpecialBuild string.
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   480
 */
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diff changeset
   481
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   482
#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
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   483
#  define PNG_LIBPNG_BUILD_TYPE \
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       (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
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   485
#else
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   486
#  ifdef PNG_LIBPNG_SPECIALBUILD
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   487
#    define PNG_LIBPNG_BUILD_TYPE \
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   488
         (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
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   489
#  else
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   490
#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
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   491
#  endif
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   492
#endif
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   493
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   494
#ifndef PNG_VERSION_INFO_ONLY
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   495
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   496
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
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   497
#ifdef __cplusplus
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   498
extern "C" {
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   499
#endif /* __cplusplus */
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   500
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   501
/* Version information for C files, stored in png.c.  This had better match
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   502
 * the version above.
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   503
 */
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   504
#define png_libpng_ver png_get_header_ver(NULL)
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diff changeset
   505
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diff changeset
   506
/* This file is arranged in several sections:
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   507
 *
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diff changeset
   508
 * 1. Any configuration options that can be specified by for the application
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diff changeset
   509
 *    code when it is built.  (Build time configuration is in pnglibconf.h)
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diff changeset
   510
 * 2. Type definitions (base types are defined in pngconf.h), structure
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   511
 *    definitions.
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diff changeset
   512
 * 3. Exported library functions.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   513
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   514
 * The library source code has additional files (principally pngpriv.h) that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   515
 * allow configuration of the library.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   516
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   517
/* Section 1: run time configuration
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   518
 * See pnglibconf.h for build time configuration
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   519
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   520
 * Run time configuration allows the application to choose between
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   521
 * implementations of certain arithmetic APIs.  The default is set
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   522
 * at build time and recorded in pnglibconf.h, but it is safe to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   523
 * override these (and only these) settings.  Note that this won't
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   524
 * change what the library does, only application code, and the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   525
 * settings can (and probably should) be made on a per-file basis
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   526
 * by setting the #defines before including png.h
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   527
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   528
 * Use macros to read integers from PNG data or use the exported
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   529
 * functions?
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   530
 *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   531
 *     the macros evaluate their argument multiple times.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   532
 *   PNG_NO_USE_READ_MACROS: call the relevant library function.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   533
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   534
 * Use the alternative algorithm for compositing alpha samples that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   535
 * does not use division?
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   536
 *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   537
 *      algorithm.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   538
 *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   539
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   540
 * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   541
 * false?
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   542
 *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   543
 *      APIs to png_warning.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   544
 * Otherwise the calls are mapped to png_error.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   545
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   546
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   547
/* Section 2: type definitions, including structures and compile time
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   548
 * constants.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   549
 * See pngconf.h for base types that vary by machine/system
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   550
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   551
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   552
/* This triggers a compiler error in png.c, if png.c and png.h
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   553
 * do not agree upon the version number.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   554
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   555
typedef char* png_libpng_version_1_5_13;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   556
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   557
/* Three color definitions.  The order of the red, green, and blue, (and the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   558
 * exact size) is not important, although the size of the fields need to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   559
 * be png_byte or png_uint_16 (as defined below).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   560
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   561
typedef struct png_color_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   562
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   563
   png_byte red;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   564
   png_byte green;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   565
   png_byte blue;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   566
} png_color;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   567
typedef png_color FAR * png_colorp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   568
typedef PNG_CONST png_color FAR * png_const_colorp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   569
typedef png_color FAR * FAR * png_colorpp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   570
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   571
typedef struct png_color_16_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   572
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   573
   png_byte index;    /* used for palette files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   574
   png_uint_16 red;   /* for use in red green blue files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   575
   png_uint_16 green;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   576
   png_uint_16 blue;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   577
   png_uint_16 gray;  /* for use in grayscale files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   578
} png_color_16;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   579
typedef png_color_16 FAR * png_color_16p;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   580
typedef PNG_CONST png_color_16 FAR * png_const_color_16p;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   581
typedef png_color_16 FAR * FAR * png_color_16pp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   582
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   583
typedef struct png_color_8_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   584
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   585
   png_byte red;   /* for use in red green blue files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   586
   png_byte green;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   587
   png_byte blue;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   588
   png_byte gray;  /* for use in grayscale files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   589
   png_byte alpha; /* for alpha channel files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   590
} png_color_8;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   591
typedef png_color_8 FAR * png_color_8p;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   592
typedef PNG_CONST png_color_8 FAR * png_const_color_8p;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   593
typedef png_color_8 FAR * FAR * png_color_8pp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   594
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   595
/*
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   596
 * The following two structures are used for the in-core representation
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   597
 * of sPLT chunks.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   598
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   599
typedef struct png_sPLT_entry_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   600
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   601
   png_uint_16 red;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   602
   png_uint_16 green;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   603
   png_uint_16 blue;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   604
   png_uint_16 alpha;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   605
   png_uint_16 frequency;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   606
} png_sPLT_entry;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   607
typedef png_sPLT_entry FAR * png_sPLT_entryp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   608
typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   609
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   610
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   611
/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   612
 *  occupy the LSB of their respective members, and the MSB of each member
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   613
 *  is zero-filled.  The frequency member always occupies the full 16 bits.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   614
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   615
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   616
typedef struct png_sPLT_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   617
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   618
   png_charp name;           /* palette name */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   619
   png_byte depth;           /* depth of palette samples */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   620
   png_sPLT_entryp entries;  /* palette entries */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   621
   png_int_32 nentries;      /* number of palette entries */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   622
} png_sPLT_t;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   623
typedef png_sPLT_t FAR * png_sPLT_tp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   624
typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   625
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   626
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   627
#ifdef PNG_TEXT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   628
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   629
 * and whether that contents is compressed or not.  The "key" field
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   630
 * points to a regular zero-terminated C string.  The "text" fields can be a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   631
 * regular C string, an empty string, or a NULL pointer.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   632
 * However, the structure returned by png_get_text() will always contain
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   633
 * the "text" field as a regular zero-terminated C string (possibly
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   634
 * empty), never a NULL pointer, so it can be safely used in printf() and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   635
 * other string-handling functions.  Note that the "itxt_length", "lang", and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   636
 * "lang_key" members of the structure only exist when the library is built
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   637
 * with iTXt chunk support.  Prior to libpng-1.4.0 the library was built by
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   638
 * default without iTXt support. Also note that when iTXt *is* supported,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   639
 * the "lang" and "lang_key" fields contain NULL pointers when the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   640
 * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   641
 * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   642
 * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   643
 * which is always 0 or 1, or its "compression method" which is always 0.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   644
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   645
typedef struct png_text_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   646
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   647
   int  compression;       /* compression value:
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   648
                             -1: tEXt, none
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   649
                              0: zTXt, deflate
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   650
                              1: iTXt, none
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   651
                              2: iTXt, deflate  */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   652
   png_charp key;          /* keyword, 1-79 character description of "text" */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   653
   png_charp text;         /* comment, may be an empty string (ie "")
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   654
                              or a NULL pointer */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   655
   png_size_t text_length; /* length of the text string */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   656
   png_size_t itxt_length; /* length of the itxt string */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   657
   png_charp lang;         /* language code, 0-79 characters
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   658
                              or a NULL pointer */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   659
   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   660
                              chars or a NULL pointer */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   661
} png_text;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   662
typedef png_text FAR * png_textp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   663
typedef PNG_CONST png_text FAR * png_const_textp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   664
typedef png_text FAR * FAR * png_textpp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   665
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   666
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   667
/* Supported compression types for text in PNG files (tEXt, and zTXt).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   668
 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   669
#define PNG_TEXT_COMPRESSION_NONE_WR -3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   670
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   671
#define PNG_TEXT_COMPRESSION_NONE    -1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   672
#define PNG_TEXT_COMPRESSION_zTXt     0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   673
#define PNG_ITXT_COMPRESSION_NONE     1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   674
#define PNG_ITXT_COMPRESSION_zTXt     2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   675
#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   676
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   677
/* png_time is a way to hold the time in an machine independent way.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   678
 * Two conversions are provided, both from time_t and struct tm.  There
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   679
 * is no portable way to convert to either of these structures, as far
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   680
 * as I know.  If you know of a portable way, send it to me.  As a side
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   681
 * note - PNG has always been Year 2000 compliant!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   682
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   683
typedef struct png_time_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   684
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   685
   png_uint_16 year; /* full year, as in, 1995 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   686
   png_byte month;   /* month of year, 1 - 12 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   687
   png_byte day;     /* day of month, 1 - 31 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   688
   png_byte hour;    /* hour of day, 0 - 23 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   689
   png_byte minute;  /* minute of hour, 0 - 59 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   690
   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   691
} png_time;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   692
typedef png_time FAR * png_timep;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   693
typedef PNG_CONST png_time FAR * png_const_timep;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   694
typedef png_time FAR * FAR * png_timepp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   695
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   696
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   697
    defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   698
/* png_unknown_chunk is a structure to hold queued chunks for which there is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   699
 * no specific support.  The idea is that we can use this to queue
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   700
 * up private chunks for output even though the library doesn't actually
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   701
 * know about their semantics.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   702
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   703
typedef struct png_unknown_chunk_t
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   704
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   705
    png_byte name[5];
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   706
    png_byte *data;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   707
    png_size_t size;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   708
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   709
    /* libpng-using applications should NOT directly modify this byte. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   710
    png_byte location; /* mode of operation at read time */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   711
}
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   712
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   713
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   714
png_unknown_chunk;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   715
typedef png_unknown_chunk FAR * png_unknown_chunkp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   716
typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   717
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   718
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   719
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   720
/* Values for the unknown chunk location byte */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   721
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   722
#define PNG_HAVE_IHDR  0x01
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   723
#define PNG_HAVE_PLTE  0x02
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   724
#define PNG_AFTER_IDAT 0x08
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   725
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   726
/* The complete definition of png_info has, as of libpng-1.5.0,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   727
 * been moved into a separate header file that is not accessible to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   728
 * applications.  Read libpng-manual.txt or libpng.3 for more info.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   729
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   730
typedef struct png_info_def png_info;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   731
typedef png_info FAR * png_infop;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   732
typedef PNG_CONST png_info FAR * png_const_infop;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   733
typedef png_info FAR * FAR * png_infopp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   734
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   735
/* Maximum positive integer used in PNG is (2^31)-1 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   736
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   737
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   738
#define PNG_SIZE_MAX ((png_size_t)(-1))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   739
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   740
/* These are constants for fixed point values encoded in the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   741
 * PNG specification manner (x100000)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   742
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   743
#define PNG_FP_1    100000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   744
#define PNG_FP_HALF  50000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   745
#define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   746
#define PNG_FP_MIN  (-PNG_FP_MAX)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   747
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   748
/* These describe the color_type field in png_info. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   749
/* color type masks */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   750
#define PNG_COLOR_MASK_PALETTE    1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   751
#define PNG_COLOR_MASK_COLOR      2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   752
#define PNG_COLOR_MASK_ALPHA      4
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   753
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   754
/* color types.  Note that not all combinations are legal */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   755
#define PNG_COLOR_TYPE_GRAY 0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   756
#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   757
#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   758
#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   759
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   760
/* aliases */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   761
#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   762
#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   763
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   764
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   765
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   766
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   767
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   768
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   769
#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   770
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   771
#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   772
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   773
/* These are for the interlacing type.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   774
#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   775
#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   776
#define PNG_INTERLACE_LAST        2 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   777
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   778
/* These are for the oFFs chunk.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   779
#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   780
#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   781
#define PNG_OFFSET_LAST           2 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   782
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   783
/* These are for the pCAL chunk.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   784
#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   785
#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   786
#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   787
#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   788
#define PNG_EQUATION_LAST         4 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   789
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   790
/* These are for the sCAL chunk.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   791
#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   792
#define PNG_SCALE_METER           1 /* meters per pixel */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   793
#define PNG_SCALE_RADIAN          2 /* radians per pixel */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   794
#define PNG_SCALE_LAST            3 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   795
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   796
/* These are for the pHYs chunk.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   797
#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   798
#define PNG_RESOLUTION_METER      1 /* pixels/meter */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   799
#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   800
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   801
/* These are for the sRGB chunk.  These values should NOT be changed. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   802
#define PNG_sRGB_INTENT_PERCEPTUAL 0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   803
#define PNG_sRGB_INTENT_RELATIVE   1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   804
#define PNG_sRGB_INTENT_SATURATION 2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   805
#define PNG_sRGB_INTENT_ABSOLUTE   3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   806
#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   807
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   808
/* This is for text chunks */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   809
#define PNG_KEYWORD_MAX_LENGTH     79
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   810
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   811
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   812
#define PNG_MAX_PALETTE_LENGTH    256
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   813
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   814
/* These determine if an ancillary chunk's data has been successfully read
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   815
 * from the PNG header, or if the application has filled in the corresponding
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   816
 * data in the info_struct to be written into the output file.  The values
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   817
 * of the PNG_INFO_<chunk> defines should NOT be changed.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   818
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   819
#define PNG_INFO_gAMA 0x0001
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   820
#define PNG_INFO_sBIT 0x0002
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   821
#define PNG_INFO_cHRM 0x0004
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   822
#define PNG_INFO_PLTE 0x0008
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   823
#define PNG_INFO_tRNS 0x0010
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   824
#define PNG_INFO_bKGD 0x0020
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   825
#define PNG_INFO_hIST 0x0040
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   826
#define PNG_INFO_pHYs 0x0080
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   827
#define PNG_INFO_oFFs 0x0100
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   828
#define PNG_INFO_tIME 0x0200
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   829
#define PNG_INFO_pCAL 0x0400
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   830
#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   831
#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   832
#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   833
#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   834
#define PNG_INFO_IDAT 0x8000   /* ESR, 1.0.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   835
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   836
/* This is used for the transformation routines, as some of them
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   837
 * change these values for the row.  It also should enable using
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   838
 * the routines for other purposes.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   839
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   840
typedef struct png_row_info_struct
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   841
{
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   842
   png_uint_32 width;    /* width of row */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   843
   png_size_t rowbytes;  /* number of bytes in row */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   844
   png_byte color_type;  /* color type of row */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   845
   png_byte bit_depth;   /* bit depth of row */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   846
   png_byte channels;    /* number of channels (1, 2, 3, or 4) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   847
   png_byte pixel_depth; /* bits per pixel (depth * channels) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   848
} png_row_info;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   849
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   850
typedef png_row_info FAR * png_row_infop;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   851
typedef png_row_info FAR * FAR * png_row_infopp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   852
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   853
/* The complete definition of png_struct has, as of libpng-1.5.0,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   854
 * been moved into a separate header file that is not accessible to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   855
 * applications.  Read libpng-manual.txt or libpng.3 for more info.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   856
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   857
typedef struct png_struct_def png_struct;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   858
typedef PNG_CONST png_struct FAR * png_const_structp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   859
typedef png_struct FAR * png_structp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   860
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   861
/* These are the function types for the I/O functions and for the functions
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   862
 * that allow the user to override the default I/O functions with his or her
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   863
 * own.  The png_error_ptr type should match that of user-supplied warning
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   864
 * and error functions, while the png_rw_ptr type should match that of the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   865
 * user read/write data functions.  Note that the 'write' function must not
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   866
 * modify the buffer it is passed. The 'read' function, on the other hand, is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   867
 * expected to return the read data in the buffer.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   868
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   869
typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   870
typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   871
typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   872
typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   873
    int));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   874
typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   875
    int));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   876
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   877
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   878
typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   879
typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   880
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   881
/* The following callback receives png_uint_32 row_number, int pass for the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   882
 * png_bytep data of the row.  When transforming an interlaced image the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   883
 * row number is the row number within the sub-image of the interlace pass, so
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   884
 * the value will increase to the height of the sub-image (not the full image)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   885
 * then reset to 0 for the next pass.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   886
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   887
 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   888
 * find the output pixel (x,y) given an interlaced sub-image pixel
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   889
 * (row,col,pass).  (See below for these macros.)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   890
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   891
typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   892
    png_uint_32, int));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   893
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   894
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   895
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   896
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   897
typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   898
    png_bytep));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   899
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   900
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   901
#ifdef PNG_USER_CHUNKS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   902
typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   903
    png_unknown_chunkp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   904
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   905
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   906
typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   907
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   908
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   909
#ifdef PNG_SETJMP_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   910
/* This must match the function definition in <setjmp.h>, and the application
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   911
 * must include this before png.h to obtain the definition of jmp_buf.  The
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   912
 * function is required to be PNG_NORETURN, but this is not checked.  If the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   913
 * function does return the application will crash via an abort() or similar
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   914
 * system level call.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   915
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   916
 * If you get a warning here while building the library you may need to make
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   917
 * changes to ensure that pnglibconf.h records the calling convention used by
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   918
 * your compiler.  This may be very difficult - try using a different compiler
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   919
 * to build the library!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   920
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   921
PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   922
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   923
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   924
/* Transform masks for the high-level interface */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   925
#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   926
#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   927
#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   928
#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   929
#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   930
#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   931
#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   932
#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   933
#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   934
#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   935
#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   936
#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   937
#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   938
/* Added to libpng-1.2.34 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   939
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   940
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   941
/* Added to libpng-1.4.0 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   942
#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   943
/* Added to libpng-1.5.4 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   944
#define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   945
#define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   946
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   947
/* Flags for MNG supported features */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   948
#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   949
#define PNG_FLAG_MNG_FILTER_64      0x04
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   950
#define PNG_ALL_MNG_FEATURES        0x05
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   951
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   952
/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   953
 * this allowed the zlib default functions to be used on Windows
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   954
 * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   955
 * ignores the first argument) should be completely compatible with the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   956
 * following.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   957
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   958
typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   959
    png_alloc_size_t));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   960
typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   961
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   962
typedef png_struct FAR * FAR * png_structpp;
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   963
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   964
/* Section 3: exported functions
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   965
 * Here are the function definitions most commonly used.  This is not
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   966
 * the place to find out how to use libpng.  See libpng-manual.txt for the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   967
 * full explanation, see example.c for the summary.  This just provides
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   968
 * a simple one line description of the use of each function.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   969
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   970
 * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   971
 * pngconf.h and in the *.dfn files in the scripts directory.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   972
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   973
 *   PNG_EXPORT(ordinal, type, name, (args));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   974
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   975
 *       ordinal:    ordinal that is used while building
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   976
 *                   *.def files. The ordinal value is only
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   977
 *                   relevant when preprocessing png.h with
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   978
 *                   the *.dfn files for building symbol table
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   979
 *                   entries, and are removed by pngconf.h.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   980
 *       type:       return type of the function
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   981
 *       name:       function name
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   982
 *       args:       function arguments, with types
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   983
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   984
 * When we wish to append attributes to a function prototype we use
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   985
 * the PNG_EXPORTA() macro instead.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   986
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   987
 *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   988
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   989
 *       ordinal, type, name, and args: same as in PNG_EXPORT().
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   990
 *       attributes: function attributes
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   991
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   992
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   993
/* Returns the version number of the library */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   994
PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   995
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   996
/* Tell lib we have already handled the first <num_bytes> magic bytes.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   997
 * Handling more than 8 bytes from the beginning of the file is an error.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   998
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
   999
PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1001
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1002
 * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1003
 * signature, and non-zero otherwise.  Having num_to_check == 0 or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1004
 * start > 7 will always fail (ie return non-zero).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1005
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1006
PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1007
    png_size_t num_to_check));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1008
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1009
/* Simple signature checking function.  This is the same as calling
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1010
 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1011
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1012
#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1013
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1014
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1015
PNG_EXPORTA(4, png_structp, png_create_read_struct,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1016
    (png_const_charp user_png_ver, png_voidp error_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1017
    png_error_ptr error_fn, png_error_ptr warn_fn),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1018
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1019
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1020
/* Allocate and initialize png_ptr struct for writing, and any other memory */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1021
PNG_EXPORTA(5, png_structp, png_create_write_struct,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1022
    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1023
    png_error_ptr warn_fn),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1024
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1025
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1026
PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1027
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1028
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1029
PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1030
    png_size_t size));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1031
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1032
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1033
 * match up.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1034
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1035
#ifdef PNG_SETJMP_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1036
/* This function returns the jmp_buf built in to *png_ptr.  It must be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1037
 * supplied with an appropriate 'longjmp' function to use on that jmp_buf
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1038
 * unless the default error function is overridden in which case NULL is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1039
 * acceptable.  The size of the jmp_buf is checked against the actual size
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1040
 * allocated by the library - the call will return NULL on a mismatch
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1041
 * indicating an ABI mismatch.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1042
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1043
PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1044
    png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1045
#  define png_jmpbuf(png_ptr) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1046
      (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1047
#else
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1048
#  define png_jmpbuf(png_ptr) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1049
      (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1050
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1051
/* This function should be used by libpng applications in place of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1052
 * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1053
 * will use it; otherwise it will call PNG_ABORT().  This function was
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1054
 * added in libpng-1.5.0.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1055
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1056
PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1057
    PNG_NORETURN);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1058
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1059
#ifdef PNG_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1060
/* Reset the compression stream */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1061
PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1062
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1063
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1064
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1065
#ifdef PNG_USER_MEM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1066
PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1067
    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1068
    png_error_ptr warn_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1069
    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1070
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1071
PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1072
    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1073
    png_error_ptr warn_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1074
    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1075
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1076
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1077
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1078
/* Write the PNG file signature. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1079
PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1080
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1081
/* Write a PNG chunk - size, type, (optional) data, CRC. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1082
PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1083
    chunk_name, png_const_bytep data, png_size_t length));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1084
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1085
/* Write the start of a PNG chunk - length and chunk name. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1086
PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1087
    png_const_bytep chunk_name, png_uint_32 length));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1088
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1089
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1090
PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1091
    png_const_bytep data, png_size_t length));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1092
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1093
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1094
PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1095
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1096
/* Allocate and initialize the info structure */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1097
PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1098
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1099
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1100
PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1101
    png_size_t png_info_struct_size));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1102
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1103
/* Writes all the PNG information before the image. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1104
PNG_EXPORT(20, void, png_write_info_before_PLTE,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1105
    (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1106
PNG_EXPORT(21, void, png_write_info,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1107
    (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1108
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1109
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1110
/* Read the information before the actual image data. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1111
PNG_EXPORT(22, void, png_read_info,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1112
    (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1113
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1114
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1115
#ifdef PNG_TIME_RFC1123_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1116
PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1117
    (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1118
    png_const_timep ptime));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1119
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1120
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1121
#ifdef PNG_CONVERT_tIME_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1122
/* Convert from a struct tm to png_time */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1123
PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1124
    PNG_CONST struct tm FAR * ttime));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1125
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1126
/* Convert from time_t to png_time.  Uses gmtime() */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1127
PNG_EXPORT(25, void, png_convert_from_time_t,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1128
    (png_timep ptime, time_t ttime));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1129
#endif /* PNG_CONVERT_tIME_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1130
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1131
#ifdef PNG_READ_EXPAND_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1132
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1133
PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1134
PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1135
PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1136
PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1137
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1138
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1139
#ifdef PNG_READ_EXPAND_16_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1140
/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1141
 * of a tRNS chunk if present.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1142
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1143
PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1144
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1145
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1146
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1147
/* Use blue, green, red order for pixels. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1148
PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1149
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1150
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1151
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1152
/* Expand the grayscale to 24-bit RGB if necessary. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1153
PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1154
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1155
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1156
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1157
/* Reduce RGB to grayscale. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1158
#define PNG_ERROR_ACTION_NONE  1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1159
#define PNG_ERROR_ACTION_WARN  2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1160
#define PNG_ERROR_ACTION_ERROR 3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1161
#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1162
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1163
PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1164
    int error_action, double red, double green))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1165
PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1166
    int error_action, png_fixed_point red, png_fixed_point green))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1167
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1168
PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1169
    png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1170
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1171
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1172
#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1173
PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1174
    png_colorp palette));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1175
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1176
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1177
#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1178
/* How the alpha channel is interpreted - this affects how the color channels of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1179
 * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1180
 * file, is present.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1181
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1182
 * This has no effect on the way pixels are written into a PNG output
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1183
 * datastream. The color samples in a PNG datastream are never premultiplied
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1184
 * with the alpha samples.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1185
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1186
 * The default is to return data according to the PNG specification: the alpha
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1187
 * channel is a linear measure of the contribution of the pixel to the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1188
 * corresponding composited pixel.  The gamma encoded color channels must be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1189
 * scaled according to the contribution and to do this it is necessary to undo
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1190
 * the encoding, scale the color values, perform the composition and reencode
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1191
 * the values.  This is the 'PNG' mode.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1192
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1193
 * The alternative is to 'associate' the alpha with the color information by
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1194
 * storing color channel values that have been scaled by the alpha.  The
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1195
 * advantage is that the color channels can be resampled (the image can be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1196
 * scaled) in this form.  The disadvantage is that normal practice is to store
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1197
 * linear, not (gamma) encoded, values and this requires 16-bit channels for
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1198
 * still images rather than the 8-bit channels that are just about sufficient if
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1199
 * gamma encoding is used.  In addition all non-transparent pixel values,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1200
 * including completely opaque ones, must be gamma encoded to produce the final
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1201
 * image.  This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1202
 * latter being the two common names for associated alpha color channels.)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1203
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1204
 * Since it is not necessary to perform arithmetic on opaque color values so
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1205
 * long as they are not to be resampled and are in the final color space it is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1206
 * possible to optimize the handling of alpha by storing the opaque pixels in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1207
 * the PNG format (adjusted for the output color space) while storing partially
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1208
 * opaque pixels in the standard, linear, format.  The accuracy required for
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1209
 * standard alpha composition is relatively low, because the pixels are
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1210
 * isolated, therefore typically the accuracy loss in storing 8-bit linear
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1211
 * values is acceptable.  (This is not true if the alpha channel is used to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1212
 * simulate transparency over large areas - use 16 bits or the PNG mode in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1213
 * this case!)  This is the 'OPTIMIZED' mode.  For this mode a pixel is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1214
 * treated as opaque only if the alpha value is equal to the maximum value.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1215
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1216
 * The final choice is to gamma encode the alpha channel as well.  This is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1217
 * broken because, in practice, no implementation that uses this choice
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1218
 * correctly undoes the encoding before handling alpha composition.  Use this
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1219
 * choice only if other serious errors in the software or hardware you use
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1220
 * mandate it; the typical serious error is for dark halos to appear around
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1221
 * opaque areas of the composited PNG image because of arithmetic overflow.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1222
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1223
 * The API function png_set_alpha_mode specifies which of these choices to use
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1224
 * with an enumerated 'mode' value and the gamma of the required output:
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1225
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1226
#define PNG_ALPHA_PNG           0 /* according to the PNG standard */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1227
#define PNG_ALPHA_STANDARD      1 /* according to Porter/Duff */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1228
#define PNG_ALPHA_ASSOCIATED    1 /* as above; this is the normal practice */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1229
#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1230
#define PNG_ALPHA_OPTIMIZED     2 /* 'PNG' for opaque pixels, else 'STANDARD' */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1231
#define PNG_ALPHA_BROKEN        3 /* the alpha channel is gamma encoded */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1232
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1233
PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1234
    double output_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1235
PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1236
    int mode, png_fixed_point output_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1237
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1238
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1239
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1240
/* The output_gamma value is a screen gamma in libpng terminology: it expresses
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1241
 * how to decode the output values, not how they are encoded.  The values used
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1242
 * correspond to the normal numbers used to describe the overall gamma of a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1243
 * computer display system; for example 2.2 for an sRGB conformant system.  The
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1244
 * values are scaled by 100000 in the _fixed version of the API (so 220000 for
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1245
 * sRGB.)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1246
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1247
 * The inverse of the value is always used to provide a default for the PNG file
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1248
 * encoding if it has no gAMA chunk and if png_set_gamma() has not been called
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1249
 * to override the PNG gamma information.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1250
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1251
 * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1252
 * opaque pixels however pixels with lower alpha values are not encoded,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1253
 * regardless of the output gamma setting.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1254
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1255
 * When the standard Porter Duff handling is requested with mode 1 the output
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1256
 * encoding is set to be linear and the output_gamma value is only relevant
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1257
 * as a default for input data that has no gamma information.  The linear output
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1258
 * encoding will be overridden if png_set_gamma() is called - the results may be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1259
 * highly unexpected!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1260
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1261
 * The following numbers are derived from the sRGB standard and the research
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1262
 * behind it.  sRGB is defined to be approximated by a PNG gAMA chunk value of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1263
 * 0.45455 (1/2.2) for PNG.  The value implicitly includes any viewing
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1264
 * correction required to take account of any differences in the color
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1265
 * environment of the original scene and the intended display environment; the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1266
 * value expresses how to *decode* the image for display, not how the original
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1267
 * data was *encoded*.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1268
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1269
 * sRGB provides a peg for the PNG standard by defining a viewing environment.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1270
 * sRGB itself, and earlier TV standards, actually use a more complex transform
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1271
 * (a linear portion then a gamma 2.4 power law) than PNG can express.  (PNG is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1272
 * limited to simple power laws.)  By saying that an image for direct display on
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1273
 * an sRGB conformant system should be stored with a gAMA chunk value of 45455
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1274
 * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1275
 * makes it possible to derive values for other display systems and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1276
 * environments.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1277
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1278
 * The Mac value is deduced from the sRGB based on an assumption that the actual
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1279
 * extra viewing correction used in early Mac display systems was implemented as
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1280
 * a power 1.45 lookup table.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1281
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1282
 * Any system where a programmable lookup table is used or where the behavior of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1283
 * the final display device characteristics can be changed requires system
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1284
 * specific code to obtain the current characteristic.  However this can be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1285
 * difficult and most PNG gamma correction only requires an approximate value.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1286
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1287
 * By default, if png_set_alpha_mode() is not called, libpng assumes that all
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1288
 * values are unencoded, linear, values and that the output device also has a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1289
 * linear characteristic.  This is only very rarely correct - it is invariably
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1290
 * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1291
 * default if you don't know what the right answer is!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1292
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1293
 * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1294
 * 10.6) which used a correction table to implement a somewhat lower gamma on an
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1295
 * otherwise sRGB system.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1296
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1297
 * Both these values are reserved (not simple gamma values) in order to allow
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1298
 * more precise correction internally in the future.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1299
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1300
 * NOTE: the following values can be passed to either the fixed or floating
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1301
 * point APIs, but the floating point API will also accept floating point
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1302
 * values.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1303
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1304
#define PNG_DEFAULT_sRGB -1       /* sRGB gamma and color space */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1305
#define PNG_GAMMA_MAC_18 -2       /* Old Mac '1.8' gamma and color space */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1306
#define PNG_GAMMA_sRGB   220000   /* Television standards--matches sRGB gamma */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1307
#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1308
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1309
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1310
/* The following are examples of calls to png_set_alpha_mode to achieve the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1311
 * required overall gamma correction and, where necessary, alpha
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1312
 * premultiplication.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1313
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1314
 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1315
 *    This is the default libpng handling of the alpha channel - it is not
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1316
 *    pre-multiplied into the color components.  In addition the call states
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1317
 *    that the output is for a sRGB system and causes all PNG files without gAMA
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1318
 *    chunks to be assumed to be encoded using sRGB.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1319
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1320
 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1321
 *    In this case the output is assumed to be something like an sRGB conformant
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1322
 *    display preceeded by a power-law lookup table of power 1.45.  This is how
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1323
 *    early Mac systems behaved.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1324
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1325
 * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1326
 *    This is the classic Jim Blinn approach and will work in academic
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1327
 *    environments where everything is done by the book.  It has the shortcoming
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1328
 *    of assuming that input PNG data with no gamma information is linear - this
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1329
 *    is unlikely to be correct unless the PNG files where generated locally.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1330
 *    Most of the time the output precision will be so low as to show
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1331
 *    significant banding in dark areas of the image.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1332
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1333
 * png_set_expand_16(pp);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1334
 * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1335
 *    This is a somewhat more realistic Jim Blinn inspired approach.  PNG files
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1336
 *    are assumed to have the sRGB encoding if not marked with a gamma value and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1337
 *    the output is always 16 bits per component.  This permits accurate scaling
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1338
 *    and processing of the data.  If you know that your input PNG files were
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1339
 *    generated locally you might need to replace PNG_DEFAULT_sRGB with the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1340
 *    correct value for your system.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1341
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1342
 * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1343
 *    If you just need to composite the PNG image onto an existing background
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1344
 *    and if you control the code that does this you can use the optimization
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1345
 *    setting.  In this case you just copy completely opaque pixels to the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1346
 *    output.  For pixels that are not completely transparent (you just skip
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1347
 *    those) you do the composition math using png_composite or png_composite_16
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1348
 *    below then encode the resultant 8-bit or 16-bit values to match the output
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1349
 *    encoding.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1350
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1351
 * Other cases
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1352
 *    If neither the PNG nor the standard linear encoding work for you because
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1353
 *    of the software or hardware you use then you have a big problem.  The PNG
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1354
 *    case will probably result in halos around the image.  The linear encoding
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1355
 *    will probably result in a washed out, too bright, image (it's actually too
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1356
 *    contrasty.)  Try the ALPHA_OPTIMIZED mode above - this will probably
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1357
 *    substantially reduce the halos.  Alternatively try:
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1358
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1359
 * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1360
 *    This option will also reduce the halos, but there will be slight dark
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1361
 *    halos round the opaque parts of the image where the background is light.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1362
 *    In the OPTIMIZED mode the halos will be light halos where the background
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1363
 *    is dark.  Take your pick - the halos are unavoidable unless you can get
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1364
 *    your hardware/software fixed!  (The OPTIMIZED approach is slightly
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1365
 *    faster.)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1366
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1367
 * When the default gamma of PNG files doesn't match the output gamma.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1368
 *    If you have PNG files with no gamma information png_set_alpha_mode allows
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1369
 *    you to provide a default gamma, but it also sets the ouput gamma to the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1370
 *    matching value.  If you know your PNG files have a gamma that doesn't
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1371
 *    match the output you can take advantage of the fact that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1372
 *    png_set_alpha_mode always sets the output gamma but only sets the PNG
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1373
 *    default if it is not already set:
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1374
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1375
 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1376
 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1377
 *    The first call sets both the default and the output gamma values, the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1378
 *    second call overrides the output gamma without changing the default.  This
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1379
 *    is easier than achieving the same effect with png_set_gamma.  You must use
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1380
 *    PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1381
 *    fire if more than one call to png_set_alpha_mode and png_set_background is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1382
 *    made in the same read operation, however multiple calls with PNG_ALPHA_PNG
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1383
 *    are ignored.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1384
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1385
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1386
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1387
PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1388
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1389
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1390
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1391
    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1392
PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1393
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1394
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1395
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1396
    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1397
PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1398
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1399
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1400
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1401
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1402
PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1403
    int flags));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1404
/* The values of the PNG_FILLER_ defines should NOT be changed */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1405
#  define PNG_FILLER_BEFORE 0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1406
#  define PNG_FILLER_AFTER 1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1407
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1408
PNG_EXPORT(40, void, png_set_add_alpha,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1409
    (png_structp png_ptr, png_uint_32 filler,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1410
    int flags));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1411
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1412
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1413
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1414
/* Swap bytes in 16-bit depth files. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1415
PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1416
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1417
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1418
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1419
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1420
PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1421
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1422
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1423
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1424
    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1425
/* Swap packing order of pixels in bytes. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1426
PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1427
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1428
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1429
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1430
/* Converts files to legal bit depths. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1431
PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1432
    true_bits));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1433
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1434
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1435
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1436
    defined(PNG_WRITE_INTERLACING_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1437
/* Have the code handle the interlacing.  Returns the number of passes.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1438
 * MUST be called before png_read_update_info or png_start_read_image,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1439
 * otherwise it will not have the desired effect.  Note that it is still
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1440
 * necessary to call png_read_row or png_read_rows png_get_image_height
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1441
 * times for each pass.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1442
*/
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1443
PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1444
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1445
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1446
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1447
/* Invert monochrome files */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1448
PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1449
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1450
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1451
#ifdef PNG_READ_BACKGROUND_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1452
/* Handle alpha and tRNS by replacing with a background color.  Prior to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1453
 * libpng-1.5.4 this API must not be called before the PNG file header has been
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1454
 * read.  Doing so will result in unexpected behavior and possible warnings or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1455
 * errors if the PNG file contains a bKGD chunk.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1456
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1457
PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1458
    png_const_color_16p background_color, int background_gamma_code,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1459
    int need_expand, double background_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1460
PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1461
    png_const_color_16p background_color, int background_gamma_code,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1462
    int need_expand, png_fixed_point background_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1463
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1464
#ifdef PNG_READ_BACKGROUND_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1465
#  define PNG_BACKGROUND_GAMMA_UNKNOWN 0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1466
#  define PNG_BACKGROUND_GAMMA_SCREEN  1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1467
#  define PNG_BACKGROUND_GAMMA_FILE    2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1468
#  define PNG_BACKGROUND_GAMMA_UNIQUE  3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1469
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1470
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1471
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1472
/* Scale a 16-bit depth file down to 8-bit, accurately. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1473
PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1474
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1475
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1476
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1477
#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1478
/* Strip the second byte of information from a 16-bit depth file. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1479
PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1480
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1481
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1482
#ifdef PNG_READ_QUANTIZE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1483
/* Turn on quantizing, and reduce the palette to the number of colors
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1484
 * available.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1485
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1486
PNG_EXPORT(49, void, png_set_quantize,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1487
    (png_structp png_ptr, png_colorp palette,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1488
    int num_palette, int maximum_colors, png_const_uint_16p histogram,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1489
    int full_quantize));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1490
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1491
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1492
#ifdef PNG_READ_GAMMA_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1493
/* The threshold on gamma processing is configurable but hard-wired into the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1494
 * library.  The following is the floating point variant.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1495
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1496
#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1497
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1498
/* Handle gamma correction. Screen_gamma=(display_exponent).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1499
 * NOTE: this API simply sets the screen and file gamma values. It will
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1500
 * therefore override the value for gamma in a PNG file if it is called after
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1501
 * the file header has been read - use with care  - call before reading the PNG
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1502
 * file for best results!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1503
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1504
 * These routines accept the same gamma values as png_set_alpha_mode (described
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1505
 * above).  The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1506
 * API (floating point or fixed.)  Notice, however, that the 'file_gamma' value
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1507
 * is the inverse of a 'screen gamma' value.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1508
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1509
PNG_FP_EXPORT(50, void, png_set_gamma,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1510
    (png_structp png_ptr, double screen_gamma,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1511
    double override_file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1512
PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1513
    png_fixed_point screen_gamma, png_fixed_point override_file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1514
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1515
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1516
#ifdef PNG_WRITE_FLUSH_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1517
/* Set how many lines between output flushes - 0 for no flushing */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1518
PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1519
/* Flush the current PNG output buffer */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1520
PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1521
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1522
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1523
/* Optional update palette with requested transformations */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1524
PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1525
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1526
/* Optional call to update the users info structure */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1527
PNG_EXPORT(54, void, png_read_update_info,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1528
    (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1529
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1530
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1531
/* Read one or more rows of image data. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1532
PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1533
    png_bytepp display_row, png_uint_32 num_rows));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1534
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1535
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1536
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1537
/* Read a row of data. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1538
PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1539
    png_bytep display_row));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1540
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1541
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1542
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1543
/* Read the whole image into memory at once. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1544
PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1545
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1546
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1547
/* Write a row of image data */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1548
PNG_EXPORT(58, void, png_write_row,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1549
    (png_structp png_ptr, png_const_bytep row));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1550
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1551
/* Write a few rows of image data: (*row) is not written; however, the type
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1552
 * is declared as writeable to maintain compatibility with previous versions
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1553
 * of libpng and to allow the 'display_row' array from read_rows to be passed
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1554
 * unchanged to write_rows.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1555
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1556
PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1557
    png_uint_32 num_rows));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1558
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1559
/* Write the image data */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1560
PNG_EXPORT(60, void, png_write_image,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1561
    (png_structp png_ptr, png_bytepp image));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1562
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1563
/* Write the end of the PNG file. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1564
PNG_EXPORT(61, void, png_write_end,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1565
    (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1566
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1567
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1568
/* Read the end of the PNG file. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1569
PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1570
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1571
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1572
/* Free any memory associated with the png_info_struct */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1573
PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1574
    png_infopp info_ptr_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1575
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1576
/* Free any memory associated with the png_struct and the png_info_structs */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1577
PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1578
    png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1579
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1580
/* Free any memory associated with the png_struct and the png_info_structs */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1581
PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1582
    png_infopp info_ptr_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1583
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1584
/* Set the libpng method of handling chunk CRC errors */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1585
PNG_EXPORT(66, void, png_set_crc_action,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1586
    (png_structp png_ptr, int crit_action, int ancil_action));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1587
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1588
/* Values for png_set_crc_action() say how to handle CRC errors in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1589
 * ancillary and critical chunks, and whether to use the data contained
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1590
 * therein.  Note that it is impossible to "discard" data in a critical
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1591
 * chunk.  For versions prior to 0.90, the action was always error/quit,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1592
 * whereas in version 0.90 and later, the action for CRC errors in ancillary
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1593
 * chunks is warn/discard.  These values should NOT be changed.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1594
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1595
 *      value                       action:critical     action:ancillary
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1596
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1597
#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1598
#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1599
#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1600
#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1601
#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1602
#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1603
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1604
/* These functions give the user control over the scan-line filtering in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1605
 * libpng and the compression methods used by zlib.  These functions are
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1606
 * mainly useful for testing, as the defaults should work with most users.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1607
 * Those users who are tight on memory or want faster performance at the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1608
 * expense of compression can modify them.  See the compression library
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1609
 * header file (zlib.h) for an explination of the compression functions.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1610
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1611
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1612
/* Set the filtering method(s) used by libpng.  Currently, the only valid
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1613
 * value for "method" is 0.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1614
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1615
PNG_EXPORT(67, void, png_set_filter,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1616
    (png_structp png_ptr, int method, int filters));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1617
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1618
/* Flags for png_set_filter() to say which filters to use.  The flags
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1619
 * are chosen so that they don't conflict with real filter types
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1620
 * below, in case they are supplied instead of the #defined constants.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1621
 * These values should NOT be changed.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1622
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1623
#define PNG_NO_FILTERS     0x00
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1624
#define PNG_FILTER_NONE    0x08
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1625
#define PNG_FILTER_SUB     0x10
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1626
#define PNG_FILTER_UP      0x20
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1627
#define PNG_FILTER_AVG     0x40
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1628
#define PNG_FILTER_PAETH   0x80
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1629
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1630
                         PNG_FILTER_AVG | PNG_FILTER_PAETH)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1631
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1632
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1633
 * These defines should NOT be changed.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1634
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1635
#define PNG_FILTER_VALUE_NONE  0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1636
#define PNG_FILTER_VALUE_SUB   1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1637
#define PNG_FILTER_VALUE_UP    2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1638
#define PNG_FILTER_VALUE_AVG   3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1639
#define PNG_FILTER_VALUE_PAETH 4
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1640
#define PNG_FILTER_VALUE_LAST  5
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1641
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1642
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1643
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1644
 * defines, either the default (minimum-sum-of-absolute-differences), or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1645
 * the experimental method (weighted-minimum-sum-of-absolute-differences).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1646
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1647
 * Weights are factors >= 1.0, indicating how important it is to keep the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1648
 * filter type consistent between rows.  Larger numbers mean the current
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1649
 * filter is that many times as likely to be the same as the "num_weights"
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1650
 * previous filters.  This is cumulative for each previous row with a weight.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1651
 * There needs to be "num_weights" values in "filter_weights", or it can be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1652
 * NULL if the weights aren't being specified.  Weights have no influence on
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1653
 * the selection of the first row filter.  Well chosen weights can (in theory)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1654
 * improve the compression for a given image.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1655
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1656
 * Costs are factors >= 1.0 indicating the relative decoding costs of a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1657
 * filter type.  Higher costs indicate more decoding expense, and are
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1658
 * therefore less likely to be selected over a filter with lower computational
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1659
 * costs.  There needs to be a value in "filter_costs" for each valid filter
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1660
 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1661
 * setting the costs.  Costs try to improve the speed of decompression without
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1662
 * unduly increasing the compressed image size.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1663
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1664
 * A negative weight or cost indicates the default value is to be used, and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1665
 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1666
 * The default values for both weights and costs are currently 1.0, but may
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1667
 * change if good general weighting/cost heuristics can be found.  If both
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1668
 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1669
 * to the UNWEIGHTED method, but with added encoding time/computation.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1670
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1671
PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1672
    int heuristic_method, int num_weights, png_const_doublep filter_weights,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1673
    png_const_doublep filter_costs))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1674
PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1675
    (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1676
    int heuristic_method, int num_weights, png_const_fixed_point_p
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1677
    filter_weights, png_const_fixed_point_p filter_costs))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1678
#endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1679
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1680
/* Heuristic used for row filter selection.  These defines should NOT be
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1681
 * changed.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1682
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1683
#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1684
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1685
#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1686
#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1687
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1688
#ifdef PNG_WRITE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1689
/* Set the library compression level.  Currently, valid values range from
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1690
 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1691
 * (0 - no compression, 9 - "maximal" compression).  Note that tests have
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1692
 * shown that zlib compression levels 3-6 usually perform as well as level 9
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1693
 * for PNG images, and do considerably fewer caclulations.  In the future,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1694
 * these values may not correspond directly to the zlib compression levels.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1695
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1696
PNG_EXPORT(69, void, png_set_compression_level,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1697
    (png_structp png_ptr, int level));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1698
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1699
PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1700
    int mem_level));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1701
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1702
PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1703
    int strategy));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1704
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1705
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1706
 * smaller value of window_bits if it can do so safely.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1707
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1708
PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1709
    int window_bits));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1710
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1711
PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1712
    int method));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1713
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1714
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1715
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1716
/* Also set zlib parameters for compressing non-IDAT chunks */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1717
PNG_EXPORT(222, void, png_set_text_compression_level,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1718
    (png_structp png_ptr, int level));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1719
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1720
PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1721
    int mem_level));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1722
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1723
PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1724
    int strategy));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1725
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1726
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1727
 * smaller value of window_bits if it can do so safely.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1728
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1729
PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1730
    png_ptr, int window_bits));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1731
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1732
PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1733
    int method));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1734
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1735
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1736
/* These next functions are called for input/output, memory, and error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1737
 * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1738
 * and call standard C I/O routines such as fread(), fwrite(), and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1739
 * fprintf().  These functions can be made to use other I/O routines
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1740
 * at run time for those applications that need to handle I/O in a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1741
 * different manner by calling png_set_???_fn().  See libpng-manual.txt for
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1742
 * more information.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1743
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1744
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1745
#ifdef PNG_STDIO_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1746
/* Initialize the input/output for the PNG file to the default functions. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1747
PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1748
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1749
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1750
/* Replace the (error and abort), and warning functions with user
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1751
 * supplied functions.  If no messages are to be printed you must still
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1752
 * write and use replacement functions. The replacement error_fn should
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1753
 * still do a longjmp to the last setjmp location if you are using this
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1754
 * method of error handling.  If error_fn or warning_fn is NULL, the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1755
 * default function will be used.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1756
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1757
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1758
PNG_EXPORT(75, void, png_set_error_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1759
    (png_structp png_ptr, png_voidp error_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1760
    png_error_ptr error_fn, png_error_ptr warning_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1761
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1762
/* Return the user pointer associated with the error functions */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1763
PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1764
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1765
/* Replace the default data output functions with a user supplied one(s).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1766
 * If buffered output is not used, then output_flush_fn can be set to NULL.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1767
 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1768
 * output_flush_fn will be ignored (and thus can be NULL).
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1769
 * It is probably a mistake to use NULL for output_flush_fn if
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1770
 * write_data_fn is not also NULL unless you have built libpng with
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1771
 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1772
 * default flush function, which uses the standard *FILE structure, will
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1773
 * be used.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1774
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1775
PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1776
    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1777
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1778
/* Replace the default data input function with a user supplied one. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1779
PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1780
    png_rw_ptr read_data_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1781
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1782
/* Return the user pointer associated with the I/O functions */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1783
PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1784
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1785
PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1786
    png_read_status_ptr read_row_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1787
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1788
PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1789
    png_write_status_ptr write_row_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1790
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1791
#ifdef PNG_USER_MEM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1792
/* Replace the default memory allocation functions with user supplied one(s). */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1793
PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1794
    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1795
/* Return the user pointer associated with the memory functions */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1796
PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1797
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1798
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1799
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1800
PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1801
    png_user_transform_ptr read_user_transform_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1802
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1803
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1804
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1805
PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1806
    png_user_transform_ptr write_user_transform_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1807
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1808
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1809
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1810
PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1811
    png_voidp user_transform_ptr, int user_transform_depth,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1812
    int user_transform_channels));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1813
/* Return the user pointer associated with the user transform functions */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1814
PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1815
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1816
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1817
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1818
#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1819
/* Return information about the row currently being processed.  Note that these
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1820
 * APIs do not fail but will return unexpected results if called outside a user
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1821
 * transform callback.  Also note that when transforming an interlaced image the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1822
 * row number is the row number within the sub-image of the interlace pass, so
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1823
 * the value will increase to the height of the sub-image (not the full image)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1824
 * then reset to 0 for the next pass.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1825
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1826
 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1827
 * find the output pixel (x,y) given an interlaced sub-image pixel
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1828
 * (row,col,pass).  (See below for these macros.)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1829
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1830
PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1831
PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1832
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1833
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1834
#ifdef PNG_USER_CHUNKS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1835
PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1836
    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1837
PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1838
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1839
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1840
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1841
/* Sets the function callbacks for the push reader, and a pointer to a
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1842
 * user-defined structure available to the callback functions.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1843
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1844
PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1845
    png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1846
    png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1847
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1848
/* Returns the user pointer associated with the push read functions */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1849
PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1850
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1851
/* Function to be called when data becomes available */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1852
PNG_EXPORT(92, void, png_process_data,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1853
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1854
    png_bytep buffer, png_size_t buffer_size));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1855
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1856
/* A function which may be called *only* within png_process_data to stop the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1857
 * processing of any more data.  The function returns the number of bytes
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1858
 * remaining, excluding any that libpng has cached internally.  A subsequent
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1859
 * call to png_process_data must supply these bytes again.  If the argument
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1860
 * 'save' is set to true the routine will first save all the pending data and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1861
 * will always return 0.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1862
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1863
PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1864
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1865
/* A function which may be called *only* outside (after) a call to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1866
 * png_process_data.  It returns the number of bytes of data to skip in the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1867
 * input.  Normally it will return 0, but if it returns a non-zero value the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1868
 * application must skip than number of bytes of input data and pass the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1869
 * following data to the next call to png_process_data.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1870
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1871
PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1872
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1873
#ifdef PNG_READ_INTERLACING_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1874
/* Function that combines rows.  'new_row' is a flag that should come from
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1875
 * the callback and be non-NULL if anything needs to be done; the library
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1876
 * stores its own version of the new data internally and ignores the passed
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1877
 * in value.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1878
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1879
PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1880
    png_bytep old_row, png_const_bytep new_row));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1881
#endif /* PNG_READ_INTERLACING_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1882
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1883
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1884
PNG_EXPORTA(94, png_voidp, png_malloc,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1885
    (png_structp png_ptr, png_alloc_size_t size),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1886
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1887
/* Added at libpng version 1.4.0 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1888
PNG_EXPORTA(95, png_voidp, png_calloc,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1889
    (png_structp png_ptr, png_alloc_size_t size),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1890
    PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1891
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1892
/* Added at libpng version 1.2.4 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1893
PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1894
    png_alloc_size_t size), PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1895
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1896
/* Frees a pointer allocated by png_malloc() */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1897
PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1898
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1899
/* Free data that was allocated internally */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1900
PNG_EXPORT(98, void, png_free_data,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1901
    (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1902
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1903
/* Reassign responsibility for freeing existing data, whether allocated
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1904
 * by libpng or by the application */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1905
PNG_EXPORT(99, void, png_data_freer,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1906
    (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1907
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1908
/* Assignments for png_data_freer */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1909
#define PNG_DESTROY_WILL_FREE_DATA 1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1910
#define PNG_SET_WILL_FREE_DATA 1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1911
#define PNG_USER_WILL_FREE_DATA 2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1912
/* Flags for png_ptr->free_me and info_ptr->free_me */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1913
#define PNG_FREE_HIST 0x0008
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1914
#define PNG_FREE_ICCP 0x0010
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1915
#define PNG_FREE_SPLT 0x0020
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1916
#define PNG_FREE_ROWS 0x0040
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1917
#define PNG_FREE_PCAL 0x0080
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1918
#define PNG_FREE_SCAL 0x0100
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1919
#define PNG_FREE_UNKN 0x0200
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1920
#define PNG_FREE_LIST 0x0400
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1921
#define PNG_FREE_PLTE 0x1000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1922
#define PNG_FREE_TRNS 0x2000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1923
#define PNG_FREE_TEXT 0x4000
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1924
#define PNG_FREE_ALL  0x7fff
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1925
#define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1926
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1927
#ifdef PNG_USER_MEM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1928
PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1929
    png_alloc_size_t size), PNG_ALLOCATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1930
PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1931
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1932
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1933
#ifdef PNG_ERROR_TEXT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1934
/* Fatal error in PNG image of libpng - can't continue */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1935
PNG_EXPORTA(102, void, png_error,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1936
    (png_structp png_ptr, png_const_charp error_message),
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1937
    PNG_NORETURN);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1938
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1939
/* The same, but the chunk name is prepended to the error string. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1940
PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1941
    png_const_charp error_message), PNG_NORETURN);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1942
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1943
#else
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1944
/* Fatal error in PNG image of libpng - can't continue */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1945
PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1946
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1947
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1948
#ifdef PNG_WARNINGS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1949
/* Non-fatal error in libpng.  Can continue, but may have a problem. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1950
PNG_EXPORT(105, void, png_warning, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1951
    png_const_charp warning_message));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1952
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1953
/* Non-fatal error in libpng, chunk name is prepended to message. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1954
PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1955
    png_const_charp warning_message));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1956
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1957
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1958
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1959
/* Benign error in libpng.  Can continue, but may have a problem.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1960
 * User can choose whether to handle as a fatal error or as a warning. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1961
#  undef png_benign_error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1962
PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1963
    png_const_charp warning_message));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1964
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1965
/* Same, chunk name is prepended to message. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1966
#  undef png_chunk_benign_error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1967
PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1968
    png_const_charp warning_message));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1969
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1970
PNG_EXPORT(109, void, png_set_benign_errors,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1971
    (png_structp png_ptr, int allowed));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1972
#else
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1973
#  ifdef PNG_ALLOW_BENIGN_ERRORS
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1974
#    define png_benign_error png_warning
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1975
#    define png_chunk_benign_error png_chunk_warning
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1976
#  else
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1977
#    define png_benign_error png_error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1978
#    define png_chunk_benign_error png_chunk_error
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1979
#  endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1980
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1981
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1982
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1983
 * Similarly, the png_get_<chunk> calls are used to read values from the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1984
 * png_info_struct, either storing the parameters in the passed variables, or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1985
 * setting pointers into the png_info_struct where the data is stored.  The
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1986
 * png_get_<chunk> functions return a non-zero value if the data was available
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1987
 * in info_ptr, or return zero and do not change any of the parameters if the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1988
 * data was not available.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1989
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1990
 * These functions should be used instead of directly accessing png_info
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1991
 * to avoid problems with future changes in the size and internal layout of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1992
 * png_info_struct.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1993
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1994
/* Returns "flag" if chunk data is valid in info_ptr. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1995
PNG_EXPORT(110, png_uint_32, png_get_valid,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1996
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1997
    png_uint_32 flag));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1998
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  1999
/* Returns number of bytes needed to hold a transformed row. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2000
PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2001
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2002
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2003
#ifdef PNG_INFO_IMAGE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2004
/* Returns row_pointers, which is an array of pointers to scanlines that was
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2005
 * returned from png_read_png().
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2006
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2007
PNG_EXPORT(112, png_bytepp, png_get_rows,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2008
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2009
/* Set row_pointers, which is an array of pointers to scanlines for use
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2010
 * by png_write_png().
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2011
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2012
PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2013
    png_infop info_ptr, png_bytepp row_pointers));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2014
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2015
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2016
/* Returns number of color channels in image. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2017
PNG_EXPORT(114, png_byte, png_get_channels,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2018
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2019
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2020
#ifdef PNG_EASY_ACCESS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2021
/* Returns image width in pixels. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2022
PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2023
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2024
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2025
/* Returns image height in pixels. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2026
PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2027
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2028
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2029
/* Returns image bit_depth. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2030
PNG_EXPORT(117, png_byte, png_get_bit_depth,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2031
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2032
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2033
/* Returns image color_type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2034
PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2035
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2036
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2037
/* Returns image filter_type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2038
PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2039
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2040
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2041
/* Returns image interlace_type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2042
PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2043
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2044
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2045
/* Returns image compression_type. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2046
PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2047
    png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2048
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2049
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2050
PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2051
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2052
PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2053
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2054
PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2055
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2056
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2057
/* Returns pixel aspect ratio, computed from pHYs chunk data.  */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2058
PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2059
    (png_const_structp png_ptr, png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2060
PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2061
    (png_const_structp png_ptr, png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2062
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2063
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2064
PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2065
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2066
PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2067
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2068
PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2069
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2070
PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2071
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2072
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2073
#endif /* PNG_EASY_ACCESS_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2074
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2075
/* Returns pointer to signature string read from PNG header */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2076
PNG_EXPORT(130, png_const_bytep, png_get_signature,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2077
    (png_const_structp png_ptr, png_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2078
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2079
#ifdef PNG_bKGD_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2080
PNG_EXPORT(131, png_uint_32, png_get_bKGD,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2081
    (png_const_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2082
    png_color_16p *background));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2083
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2084
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2085
#ifdef PNG_bKGD_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2086
PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2087
    png_const_color_16p background));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2088
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2089
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2090
#ifdef PNG_cHRM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2091
PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2092
   png_const_infop info_ptr, double *white_x, double *white_y, double *red_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2093
    double *red_y, double *green_x, double *green_y, double *blue_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2094
    double *blue_y))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2095
PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2096
    png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2097
    double *green_X, double *green_Y, double *green_Z, double *blue_X,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2098
    double *blue_Y, double *blue_Z))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2099
#ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2100
PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2101
    (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2102
    png_const_infop info_ptr, png_fixed_point *int_white_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2103
    png_fixed_point *int_white_y, png_fixed_point *int_red_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2104
    png_fixed_point *int_red_y, png_fixed_point *int_green_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2105
    png_fixed_point *int_green_y, png_fixed_point *int_blue_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2106
    png_fixed_point *int_blue_y))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2107
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2108
PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2109
    (png_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2110
    png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2111
    png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2112
    png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2113
    png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2114
    png_fixed_point *int_blue_Z))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2115
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2116
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2117
#ifdef PNG_cHRM_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2118
PNG_FP_EXPORT(135, void, png_set_cHRM,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2119
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2120
    double white_x, double white_y, double red_x, double red_y, double green_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2121
    double green_y, double blue_x, double blue_y))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2122
PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2123
    png_infop info_ptr, double red_X, double red_Y, double red_Z,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2124
    double green_X, double green_Y, double green_Z, double blue_X,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2125
    double blue_Y, double blue_Z))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2126
PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2127
    png_infop info_ptr, png_fixed_point int_white_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2128
    png_fixed_point int_white_y, png_fixed_point int_red_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2129
    png_fixed_point int_red_y, png_fixed_point int_green_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2130
    png_fixed_point int_green_y, png_fixed_point int_blue_x,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2131
    png_fixed_point int_blue_y))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2132
PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2133
    png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2134
    png_fixed_point int_red_Z, png_fixed_point int_green_X,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2135
    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2136
    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2137
    png_fixed_point int_blue_Z))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2138
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2139
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2140
#ifdef PNG_gAMA_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2141
PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2142
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2143
    double *file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2144
PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2145
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2146
    png_fixed_point *int_file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2147
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2148
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2149
#ifdef PNG_gAMA_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2150
PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2151
    png_infop info_ptr, double file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2152
PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2153
    png_infop info_ptr, png_fixed_point int_file_gamma))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2154
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2155
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2156
#ifdef PNG_hIST_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2157
PNG_EXPORT(141, png_uint_32, png_get_hIST,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2158
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2159
    png_uint_16p *hist));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2160
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2161
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2162
#ifdef PNG_hIST_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2163
PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2164
    png_infop info_ptr, png_const_uint_16p hist));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2165
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2166
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2167
PNG_EXPORT(143, png_uint_32, png_get_IHDR,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2168
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2169
    png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2170
    int *interlace_method, int *compression_method, int *filter_method));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2171
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2172
PNG_EXPORT(144, void, png_set_IHDR,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2173
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2174
    png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2175
    int interlace_method, int compression_method, int filter_method));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2176
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2177
#ifdef PNG_oFFs_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2178
PNG_EXPORT(145, png_uint_32, png_get_oFFs,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2179
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2180
    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2181
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2182
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2183
#ifdef PNG_oFFs_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2184
PNG_EXPORT(146, void, png_set_oFFs,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2185
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2186
    png_int_32 offset_x, png_int_32 offset_y, int unit_type));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2187
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2188
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2189
#ifdef PNG_pCAL_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2190
PNG_EXPORT(147, png_uint_32, png_get_pCAL,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2191
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2192
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2193
    int *nparams,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2194
    png_charp *units, png_charpp *params));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2195
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2196
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2197
#ifdef PNG_pCAL_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2198
PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2199
    png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2200
    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2201
    int nparams, png_const_charp units, png_charpp params));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2202
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2203
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2204
#ifdef PNG_pHYs_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2205
PNG_EXPORT(149, png_uint_32, png_get_pHYs,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2206
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2207
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2208
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2209
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2210
#ifdef PNG_pHYs_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2211
PNG_EXPORT(150, void, png_set_pHYs,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2212
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2213
    png_uint_32 res_x, png_uint_32 res_y, int unit_type));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2214
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2215
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2216
PNG_EXPORT(151, png_uint_32, png_get_PLTE,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2217
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2218
    png_colorp *palette, int *num_palette));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2219
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2220
PNG_EXPORT(152, void, png_set_PLTE,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2221
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2222
    png_const_colorp palette, int num_palette));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2223
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2224
#ifdef PNG_sBIT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2225
PNG_EXPORT(153, png_uint_32, png_get_sBIT,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2226
    (png_const_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2227
    png_color_8p *sig_bit));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2228
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2229
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2230
#ifdef PNG_sBIT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2231
PNG_EXPORT(154, void, png_set_sBIT,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2232
    (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2233
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2234
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2235
#ifdef PNG_sRGB_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2236
PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2237
    png_const_infop info_ptr, int *file_srgb_intent));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2238
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2239
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2240
#ifdef PNG_sRGB_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2241
PNG_EXPORT(156, void, png_set_sRGB,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2242
    (png_structp png_ptr, png_infop info_ptr, int srgb_intent));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2243
PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2244
    png_infop info_ptr, int srgb_intent));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2245
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2246
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2247
#ifdef PNG_iCCP_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2248
PNG_EXPORT(158, png_uint_32, png_get_iCCP,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2249
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2250
    png_charpp name, int *compression_type, png_bytepp profile,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2251
    png_uint_32 *proflen));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2252
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2253
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2254
#ifdef PNG_iCCP_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2255
PNG_EXPORT(159, void, png_set_iCCP,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2256
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2257
    png_const_charp name, int compression_type, png_const_bytep profile,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2258
    png_uint_32 proflen));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2259
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2260
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2261
#ifdef PNG_sPLT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2262
PNG_EXPORT(160, png_uint_32, png_get_sPLT,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2263
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2264
    png_sPLT_tpp entries));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2265
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2266
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2267
#ifdef PNG_sPLT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2268
PNG_EXPORT(161, void, png_set_sPLT,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2269
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2270
    png_const_sPLT_tp entries, int nentries));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2271
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2272
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2273
#ifdef PNG_TEXT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2274
/* png_get_text also returns the number of text chunks in *num_text */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2275
PNG_EXPORT(162, png_uint_32, png_get_text,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2276
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2277
    png_textp *text_ptr, int *num_text));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2278
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2279
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2280
/* Note while png_set_text() will accept a structure whose text,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2281
 * language, and  translated keywords are NULL pointers, the structure
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2282
 * returned by png_get_text will always contain regular
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2283
 * zero-terminated C strings.  They might be empty strings but
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2284
 * they will never be NULL pointers.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2285
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2286
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2287
#ifdef PNG_TEXT_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2288
PNG_EXPORT(163, void, png_set_text,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2289
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2290
    png_const_textp text_ptr, int num_text));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2291
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2292
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2293
#ifdef PNG_tIME_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2294
PNG_EXPORT(164, png_uint_32, png_get_tIME,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2295
    (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2296
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2297
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2298
#ifdef PNG_tIME_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2299
PNG_EXPORT(165, void, png_set_tIME,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2300
    (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2301
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2302
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2303
#ifdef PNG_tRNS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2304
PNG_EXPORT(166, png_uint_32, png_get_tRNS,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2305
    (png_const_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2306
    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2307
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2308
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2309
#ifdef PNG_tRNS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2310
PNG_EXPORT(167, void, png_set_tRNS,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2311
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2312
    png_const_bytep trans_alpha, int num_trans,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2313
    png_const_color_16p trans_color));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2314
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2315
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2316
#ifdef PNG_sCAL_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2317
PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2318
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2319
    int *unit, double *width, double *height))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2320
#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2321
/* NOTE: this API is currently implemented using floating point arithmetic,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2322
 * consequently it can only be used on systems with floating point support.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2323
 * In any case the range of values supported by png_fixed_point is small and it
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2324
 * is highly recommended that png_get_sCAL_s be used instead.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2325
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2326
PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2327
    (png_structp png_ptr, png_const_infop info_ptr, int *unit,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2328
    png_fixed_point *width,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2329
    png_fixed_point *height))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2330
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2331
PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2332
    (png_const_structp png_ptr, png_const_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2333
    int *unit, png_charpp swidth, png_charpp sheight));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2334
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2335
PNG_FP_EXPORT(170, void, png_set_sCAL,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2336
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2337
    int unit, double width, double height))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2338
PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2339
   png_infop info_ptr, int unit, png_fixed_point width,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2340
   png_fixed_point height))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2341
PNG_EXPORT(171, void, png_set_sCAL_s,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2342
    (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2343
    int unit, png_const_charp swidth, png_const_charp sheight));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2344
#endif /* PNG_sCAL_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2345
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2346
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2347
/* Provide a list of chunks and how they are to be handled, if the built-in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2348
   handling or default unknown chunk handling is not desired.  Any chunks not
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2349
   listed will be handled in the default manner.  The IHDR and IEND chunks
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2350
   must not be listed.  Because this turns off the default handling for chunks
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2351
   that would otherwise be recognized the behavior of libpng transformations may
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2352
   well become incorrect!
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2353
      keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2354
           = 1: PNG_HANDLE_CHUNK_NEVER:      do not keep
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2355
           = 2: PNG_HANDLE_CHUNK_IF_SAFE:    keep only if safe-to-copy
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2356
           = 3: PNG_HANDLE_CHUNK_ALWAYS:     keep even if unsafe-to-copy
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2357
*/
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2358
PNG_EXPORT(172, void, png_set_keep_unknown_chunks,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2359
    (png_structp png_ptr, int keep,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2360
    png_const_bytep chunk_list, int num_chunks));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2361
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2362
/* The handling code is returned; the result is therefore true (non-zero) if
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2363
 * special handling is required, false for the default handling.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2364
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2365
PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2366
    png_const_bytep chunk_name));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2367
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2368
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2369
PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2370
    png_infop info_ptr, png_const_unknown_chunkp unknowns,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2371
    int num_unknowns));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2372
PNG_EXPORT(175, void, png_set_unknown_chunk_location,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2373
    (png_structp png_ptr, png_infop info_ptr, int chunk, int location));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2374
PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2375
    png_const_infop info_ptr, png_unknown_chunkpp entries));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2376
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2377
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2378
/* Png_free_data() will turn off the "valid" flag for anything it frees.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2379
 * If you need to turn it off for a chunk that your application has freed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2380
 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2381
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2382
PNG_EXPORT(177, void, png_set_invalid,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2383
    (png_structp png_ptr, png_infop info_ptr, int mask));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2384
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2385
#ifdef PNG_INFO_IMAGE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2386
/* The "params" pointer is currently not used and is for future expansion. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2387
PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2388
    int transforms, png_voidp params));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2389
PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2390
    int transforms, png_voidp params));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2391
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2392
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2393
PNG_EXPORT(180, png_const_charp, png_get_copyright,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2394
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2395
PNG_EXPORT(181, png_const_charp, png_get_header_ver,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2396
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2397
PNG_EXPORT(182, png_const_charp, png_get_header_version,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2398
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2399
PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2400
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2401
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2402
#ifdef PNG_MNG_FEATURES_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2403
PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2404
    png_uint_32 mng_features_permitted));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2405
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2406
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2407
/* For use in png_set_keep_unknown, added to version 1.2.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2408
#define PNG_HANDLE_CHUNK_AS_DEFAULT   0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2409
#define PNG_HANDLE_CHUNK_NEVER        1
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2410
#define PNG_HANDLE_CHUNK_IF_SAFE      2
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2411
#define PNG_HANDLE_CHUNK_ALWAYS       3
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2412
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2413
/* Strip the prepended error numbers ("#nnn ") from error and warning
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2414
 * messages before passing them to the error or warning handler.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2415
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2416
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2417
PNG_EXPORT(185, void, png_set_strip_error_numbers,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2418
    (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2419
    png_uint_32 strip_mode));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2420
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2421
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2422
/* Added in libpng-1.2.6 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2423
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2424
PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2425
    png_uint_32 user_width_max, png_uint_32 user_height_max));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2426
PNG_EXPORT(187, png_uint_32, png_get_user_width_max,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2427
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2428
PNG_EXPORT(188, png_uint_32, png_get_user_height_max,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2429
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2430
/* Added in libpng-1.4.0 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2431
PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2432
    png_uint_32 user_chunk_cache_max));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2433
PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2434
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2435
/* Added in libpng-1.4.1 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2436
PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2437
    png_alloc_size_t user_chunk_cache_max));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2438
PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2439
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2440
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2441
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2442
#if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2443
PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2444
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2445
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2446
PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2447
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2448
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2449
PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2450
    (png_const_structp png_ptr, png_const_infop info_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2451
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2452
PNG_FP_EXPORT(196, float, png_get_x_offset_inches,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2453
    (png_const_structp png_ptr, png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2454
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2455
PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2456
    (png_structp png_ptr, png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2457
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2458
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2459
PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2460
    png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2461
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2462
PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2463
    (png_structp png_ptr, png_const_infop info_ptr))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2464
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2465
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2466
#  ifdef PNG_pHYs_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2467
PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2468
    png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2469
    int *unit_type));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2470
#  endif /* PNG_pHYs_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2471
#endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2472
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2473
/* Added in libpng-1.4.0 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2474
#ifdef PNG_IO_STATE_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2475
PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2476
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2477
PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2478
    (png_structp png_ptr), PNG_DEPRECATED);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2479
PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2480
    (png_const_structp png_ptr));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2481
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2482
/* The flags returned by png_get_io_state() are the following: */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2483
#  define PNG_IO_NONE        0x0000   /* no I/O at this moment */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2484
#  define PNG_IO_READING     0x0001   /* currently reading */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2485
#  define PNG_IO_WRITING     0x0002   /* currently writing */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2486
#  define PNG_IO_SIGNATURE   0x0010   /* currently at the file signature */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2487
#  define PNG_IO_CHUNK_HDR   0x0020   /* currently at the chunk header */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2488
#  define PNG_IO_CHUNK_DATA  0x0040   /* currently at the chunk data */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2489
#  define PNG_IO_CHUNK_CRC   0x0080   /* currently at the chunk crc */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2490
#  define PNG_IO_MASK_OP     0x000f   /* current operation: reading/writing */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2491
#  define PNG_IO_MASK_LOC    0x00f0   /* current location: sig/hdr/data/crc */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2492
#endif /* ?PNG_IO_STATE_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2493
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2494
/* Interlace support.  The following macros are always defined so that if
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2495
 * libpng interlace handling is turned off the macros may be used to handle
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2496
 * interlaced images within the application.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2497
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2498
#define PNG_INTERLACE_ADAM7_PASSES 7
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2499
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2500
/* Two macros to return the first row and first column of the original,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2501
 * full, image which appears in a given pass.  'pass' is in the range 0
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2502
 * to 6 and the result is in the range 0 to 7.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2503
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2504
#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2505
#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2506
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2507
/* A macro to return the offset between pixels in the output row for a pair of
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2508
 * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2509
 * follows.  Note that ROW_OFFSET is the offset from one row to the next whereas
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2510
 * COL_OFFSET is from one column to the next, within a row.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2511
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2512
#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2513
#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2514
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2515
/* Two macros to help evaluate the number of rows or columns in each
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2516
 * pass.  This is expressed as a shift - effectively log2 of the number or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2517
 * rows or columns in each 8x8 tile of the original image.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2518
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2519
#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2520
#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2521
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2522
/* Hence two macros to determine the number of rows or columns in a given
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2523
 * pass of an image given its height or width.  In fact these macros may
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2524
 * return non-zero even though the sub-image is empty, because the other
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2525
 * dimension may be empty for a small image.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2526
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2527
#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2528
   -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2529
#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2530
   -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2531
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2532
/* For the reader row callbacks (both progressive and sequential) it is
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2533
 * necessary to find the row in the output image given a row in an interlaced
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2534
 * image, so two more macros:
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2535
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2536
#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2537
   (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2538
#define PNG_COL_FROM_PASS_COL(xIn, pass) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2539
   (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2540
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2541
/* Two macros which return a boolean (0 or 1) saying whether the given row
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2542
 * or column is in a particular pass.  These use a common utility macro that
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2543
 * returns a mask for a given pass - the offset 'off' selects the row or
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2544
 * column version.  The mask has the appropriate bit set for each column in
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2545
 * the tile.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2546
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2547
#define PNG_PASS_MASK(pass,off) ( \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2548
   ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2549
   ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2550
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2551
#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2552
   ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2553
#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2554
   ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2555
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2556
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2557
/* With these routines we avoid an integer divide, which will be slower on
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2558
 * most machines.  However, it does take more operations than the corresponding
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2559
 * divide method, so it may be slower on a few RISC systems.  There are two
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2560
 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2561
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2562
 * Note that the rounding factors are NOT supposed to be the same!  128 and
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2563
 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2564
 * standard method.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2565
 *
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2566
 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2567
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2568
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2569
 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2570
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2571
#  define png_composite(composite, fg, alpha, bg)         \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2572
     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2573
           * (png_uint_16)(alpha)                         \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2574
           + (png_uint_16)(bg)*(png_uint_16)(255          \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2575
           - (png_uint_16)(alpha)) + 128);                \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2576
       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2577
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2578
#  define png_composite_16(composite, fg, alpha, bg)       \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2579
     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg)  \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2580
           * (png_uint_32)(alpha)                          \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2581
           + (png_uint_32)(bg)*(65535                      \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2582
           - (png_uint_32)(alpha)) + 32768);               \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2583
       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2584
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2585
#else  /* Standard method using integer division */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2586
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2587
#  define png_composite(composite, fg, alpha, bg)                          \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2588
     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +  \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2589
     (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2590
     127) / 255)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2591
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2592
#  define png_composite_16(composite, fg, alpha, bg)                         \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2593
     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2594
     (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) +         \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2595
     32767) / 65535)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2596
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2597
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2598
#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2599
PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2600
PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2601
PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2602
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2603
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2604
PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2605
    png_const_bytep buf));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2606
/* No png_get_int_16 -- may be added if there's a real need for it. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2607
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2608
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2609
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2610
PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2611
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2612
#ifdef PNG_SAVE_INT_32_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2613
PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2614
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2615
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2616
/* Place a 16-bit number into a buffer in PNG byte order.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2617
 * The parameter is declared unsigned int, not png_uint_16,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2618
 * just to avoid potential problems on pre-ANSI C compilers.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2619
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2620
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2621
PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2622
/* No png_save_int_16 -- may be added if there's a real need for it. */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2623
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2624
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2625
#ifdef PNG_USE_READ_MACROS
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2626
/* Inline macros to do direct reads of bytes from the input buffer.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2627
 * The png_get_int_32() routine assumes we are using two's complement
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2628
 * format for negative values, which is almost certainly true.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2629
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2630
#  define png_get_uint_32(buf) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2631
     (((png_uint_32)(*(buf)) << 24) + \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2632
      ((png_uint_32)(*((buf) + 1)) << 16) + \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2633
      ((png_uint_32)(*((buf) + 2)) << 8) + \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2634
      ((png_uint_32)(*((buf) + 3))))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2635
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2636
   /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2637
    * function) incorrectly returned a value of type png_uint_32.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2638
    */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2639
#  define png_get_uint_16(buf) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2640
     ((png_uint_16) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2641
      (((unsigned int)(*(buf)) << 8) + \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2642
       ((unsigned int)(*((buf) + 1)))))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2643
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2644
#  define png_get_int_32(buf) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2645
     ((png_int_32)((*(buf) & 0x80) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2646
      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2647
      : (png_int_32)png_get_uint_32(buf)))
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2648
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2649
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2650
#if defined(PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED) || \
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2651
    defined(PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED)
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2652
PNG_EXPORT(234, void, png_set_check_for_invalid_index, (png_structp png_ptr,
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2653
    int allowed));
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2654
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2655
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2656
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2657
 * defs
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2658
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2659
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2660
/* The last ordinal number (this is the *last* one already used; the next
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2661
 * one to use is one more than this.)  Maintainer, remember to add an entry to
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2662
 * scripts/symbols.def as well.
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2663
 */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2664
#ifdef PNG_EXPORT_LAST_ORDINAL
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2665
  PNG_EXPORT_LAST_ORDINAL(234);
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2666
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2667
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2668
#ifdef __cplusplus
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2669
}
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2670
#endif
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2671
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2672
#endif /* PNG_VERSION_INFO_ONLY */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2673
/* Do not put anything past this line */
57b117d441b9 consistent line endings
nemo
parents: 7812
diff changeset
  2674
#endif /* PNG_H */