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/*---------------------------------------------------------------------------
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   rpng - simple PNG display program                              readpng.h
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  ---------------------------------------------------------------------------
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      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
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      This software is provided "as is," without warranty of any kind,
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      express or implied.  In no event shall the author or contributors
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      be held liable for any damages arising in any way from the use of
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      this software.
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      The contents of this file are DUAL-LICENSED.  You may modify and/or
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      redistribute this software according to the terms of one of the
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      following two licenses (at your option):
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      LICENSE 1 ("BSD-like with advertising clause"):
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      Permission is granted to anyone to use this software for any purpose,
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      including commercial applications, and to alter it and redistribute
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      it freely, subject to the following restrictions:
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      1. Redistributions of source code must retain the above copyright
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         notice, disclaimer, and this list of conditions.
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      2. Redistributions in binary form must reproduce the above copyright
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         notice, disclaimer, and this list of conditions in the documenta-
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         tion and/or other materials provided with the distribution.
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      3. All advertising materials mentioning features or use of this
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         software must display the following acknowledgment:
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            This product includes software developed by Greg Roelofs
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            and contributors for the book, "PNG: The Definitive Guide,"
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            published by O'Reilly and Associates.
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      LICENSE 2 (GNU GPL v2 or later):
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      This program is free software; you can redistribute it and/or modify
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      it under the terms of the GNU General Public License as published by
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      the Free Software Foundation; either version 2 of the License, or
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      (at your option) any later version.
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      This program is distributed in the hope that it will be useful,
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      but WITHOUT ANY WARRANTY; without even the implied warranty of
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      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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      GNU General Public License for more details.
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      You should have received a copy of the GNU General Public License
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      along with this program; if not, write to the Free Software Foundation,
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      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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  ---------------------------------------------------------------------------*/
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#ifndef TRUE
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#  define TRUE 1
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#  define FALSE 0
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#endif
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#ifndef MAX
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#  define MAX(a,b)  ((a) > (b)? (a) : (b))
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#  define MIN(a,b)  ((a) < (b)? (a) : (b))
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#endif
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#ifdef DEBUG
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#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
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#else
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#  define Trace(x)  ;
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#endif
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typedef unsigned char   uch;
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typedef unsigned short  ush;
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typedef unsigned long   ulg;
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/* prototypes for public functions in readpng.c */
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void readpng_version_info(void);
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int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
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int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
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uch *readpng_get_image(double display_exponent, int *pChannels,
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                       ulg *pRowbytes);
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void readpng_cleanup(int free_image_data);