FreeWRL/FreeX3D  3.0.0
readpng.h
1 /*
2 
3 
4 Read PNG images.
5 
6 */
7 
8 /****************************************************************************
9  This file is part of the FreeWRL/FreeX3D Distribution.
10 
11  Copyright 2009 CRC Canada. (http://www.crc.gc.ca)
12 
13  FreeWRL/FreeX3D is free software: you can redistribute it and/or modify
14  it under the terms of the GNU Lesser Public License as published by
15  the Free Software Foundation, either version 3 of the License, or
16  (at your option) any later version.
17 
18  FreeWRL/FreeX3D is distributed in the hope that it will be useful,
19  but WITHOUT ANY WARRANTY; without even the implied warranty of
20  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21  GNU General Public License for more details.
22 
23  You should have received a copy of the GNU General Public License
24  along with FreeWRL/FreeX3D. If not, see <http://www.gnu.org/licenses/>.
25 ****************************************************************************/
26 
27 
28 #ifndef __FREEWRL_READ_PNG_H__
29 #define __FREEWRL_READ_PNG_H__
30 
31 /*---------------------------------------------------------------------------
32 
33  rpng - simple PNG display program readpng.h
34 
35  ---------------------------------------------------------------------------
36 
37  Copyright (c) 1998-2000 Greg Roelofs. All rights reserved.
38 
39  This software is provided "as is," without warranty of any kind,
40  express or implied. In no event shall the author or contributors
41  be held liable for any damages arising in any way from the use of
42  this software.
43 
44  Permission is granted to anyone to use this software for any purpose,
45  including commercial applications, and to alter it and redistribute
46  it freely, subject to the following restrictions:
47 
48  1. Redistributions of source code must retain the above copyright
49  notice, disclaimer, and this list of conditions.
50  2. Redistributions in binary form must reproduce the above copyright
51  notice, disclaimer, and this list of conditions in the documenta-
52  tion and/or other materials provided with the distribution.
53  3. All advertising materials mentioning features or use of this
54  software must display the following acknowledgment:
55 
56  This product includes software developed by Greg Roelofs
57  and contributors for the book, "PNG: The Definitive Guide,"
58  published by O'Reilly and Associates.
59 
60  ---------------------------------------------------------------------------*/
61 
62 #ifndef TRUE
63 # define TRUE 1
64 # define FALSE 0
65 #endif
66 
67 #ifndef MAX
68 # define MAX(a,b) ((a) > (b)? (a) : (b))
69 # define MIN(a,b) ((a) < (b)? (a) : (b))
70 #endif
71 
72 #if defined(FW_PNG_DEBUG)
73 # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
74 #else
75 # define Trace(x) ;
76 #endif
77 
78 typedef unsigned char uch;
79 typedef unsigned short ush;
80 typedef unsigned long ulg;
81 
82 
83 /* prototypes for public functions in readpng.c */
84 
85 void readpng_version_info(void);
86 
87 int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight);
88 
89 int readpng_get_bgcolor(uch *bg_red, uch *bg_green, uch *bg_blue);
90 
91 uch *readpng_get_image(double display_exponent, int *pChannels,
92  ulg *pRowbytes);
93 
94 void readpng_cleanup(int free_image_data);
95 
96 
97 #endif /* __FREEWRL_READ_PNG_H__ */