1/*---------------------------------------------------------------------------
2
3   rpng - simple PNG display program                              readpng.h
4
5  ---------------------------------------------------------------------------
6
7      Copyright (c) 1998-2007 Greg Roelofs.  All rights reserved.
8
9      This software is provided "as is," without warranty of any kind,
10      express or implied.  In no event shall the author or contributors
11      be held liable for any damages arising in any way from the use of
12      this software.
13
14      The contents of this file are DUAL-LICENSED.  You may modify and/or
15      redistribute this software according to the terms of one of the
16      following two licenses (at your option):
17
18
19      LICENSE 1 ("BSD-like with advertising clause"):
20
21      Permission is granted to anyone to use this software for any purpose,
22      including commercial applications, and to alter it and redistribute
23      it freely, subject to the following restrictions:
24
25      1. Redistributions of source code must retain the above copyright
26         notice, disclaimer, and this list of conditions.
27      2. Redistributions in binary form must reproduce the above copyright
28         notice, disclaimer, and this list of conditions in the documenta-
29         tion and/or other materials provided with the distribution.
30      3. All advertising materials mentioning features or use of this
31         software must display the following acknowledgment:
32
33            This product includes software developed by Greg Roelofs
34            and contributors for the book, "PNG: The Definitive Guide,"
35            published by O'Reilly and Associates.
36
37
38      LICENSE 2 (GNU GPL v2 or later):
39
40      This program is free software; you can redistribute it and/or modify
41      it under the terms of the GNU General Public License as published by
42      the Free Software Foundation; either version 2 of the License, or
43      (at your option) any later version.
44
45      This program is distributed in the hope that it will be useful,
46      but WITHOUT ANY WARRANTY; without even the implied warranty of
47      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
48      GNU General Public License for more details.
49
50      You should have received a copy of the GNU General Public License
51      along with this program; if not, write to the Free Software Foundation,
52      Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
53
54  ---------------------------------------------------------------------------*/
55
56#ifndef TRUE
57#  define TRUE 1
58#  define FALSE 0
59#endif
60
61#ifndef MAX
62#  define MAX(a,b)  ((a) > (b)? (a) : (b))
63#  define MIN(a,b)  ((a) < (b)? (a) : (b))
64#endif
65
66#ifdef DEBUG
67#  define Trace(x)  {fprintf x ; fflush(stderr); fflush(stdout);}
68#else
69#  define Trace(x)  ;
70#endif
71
72typedef unsigned char   uch;
73typedef unsigned short  ush;
74typedef unsigned long   ulg;
75
76
77/* prototypes for public functions in readpng.c */
78
79void readpng_version_info(void);
80
81int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
82
83int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
84
85uch *readpng_get_image(double display_exponent, int *pChannels,
86                       ulg *pRowbytes);
87
88void readpng_cleanup(int free_image_data);
89