1 /*---------------------------------------------------------------------------
3 rpng2 - progressive-model PNG display program readpng2.h
5 ---------------------------------------------------------------------------
7 Copyright (c) 1998-2001 Greg Roelofs. All rights reserved.
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
14 Permission is granted to anyone to use this software for any purpose,
15 including commercial applications, and to alter it and redistribute
16 it freely, subject to the following restrictions:
18 1. Redistributions of source code must retain the above copyright
19 notice, disclaimer, and this list of conditions.
20 2. Redistributions in binary form must reproduce the above copyright
21 notice, disclaimer, and this list of conditions in the documenta-
22 tion and/or other materials provided with the distribution.
23 3. All advertising materials mentioning features or use of this
24 software must display the following acknowledgment:
26 This product includes software developed by Greg Roelofs
27 and contributors for the book, "PNG: The Definitive Guide,"
28 published by O'Reilly and Associates.
30 ---------------------------------------------------------------------------*/
38 # define MAX(a,b) ((a) > (b)? (a) : (b))
39 # define MIN(a,b) ((a) < (b)? (a) : (b))
43 # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
48 typedef unsigned char uch;
49 typedef unsigned short ush;
50 typedef unsigned long ulg;
52 typedef struct _mainprog_info {
53 double display_exponent;
58 void (*mainprog_init)(void);
59 void (*mainprog_display_row)(ulg row_num);
60 void (*mainprog_finish_display)(void);
64 int passes; /* not used */
69 #if (defined(__i386__) || defined(_M_IX86))
81 /* prototypes for public functions in readpng2.c */
83 void readpng2_version_info(void);
85 int readpng2_check_sig(uch *sig, int num);
87 int readpng2_init(mainprog_info *mainprog_ptr);
89 int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
91 void readpng2_cleanup(mainprog_info *mainprog_ptr);