86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/*---------------------------------------------------------------------------
|
|
|
|
rpng2 - progressive-model PNG display program readpng2.h
|
|
|
|
---------------------------------------------------------------------------
|
|
|
|
Copyright (c) 1998-1999 Greg Roelofs. All rights reserved.
|
|
|
|
This software is provided "as is," without warranty of any kind,
|
|
express or implied. In no event shall the author or contributors
|
|
be held liable for any damages arising in any way from the use of
|
|
this software.
|
|
|
|
Permission is granted to anyone to use this software for any purpose,
|
|
including commercial applications, and to alter it and redistribute
|
|
it freely, subject to the following restrictions:
|
|
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, disclaimer, and this list of conditions.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, disclaimer, and this list of conditions in the documenta-
|
|
tion and/or other materials provided with the distribution.
|
|
3. All advertising materials mentioning features or use of this
|
|
software must display the following acknowledgment:
|
|
|
|
This product includes software developed by Greg Roelofs
|
|
and contributors for the book, "PNG: The Definitive Guide,"
|
|
published by O'Reilly and Associates.
|
|
|
|
---------------------------------------------------------------------------*/
|
|
|
|
#ifndef TRUE
|
|
# define TRUE 1
|
|
# define FALSE 0
|
|
#endif
|
|
|
|
#ifndef MAX
|
|
# define MAX(a,b) ((a) > (b)? (a) : (b))
|
|
# define MIN(a,b) ((a) < (b)? (a) : (b))
|
|
#endif
|
|
|
|
#ifdef DEBUG
|
|
# define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
|
|
#else
|
|
# define Trace(x) ;
|
|
#endif
|
|
|
|
typedef unsigned char uch;
|
|
typedef unsigned short ush;
|
|
typedef unsigned long ulg;
|
|
|
|
typedef struct _mainprog_info {
|
|
double display_exponent;
|
|
ulg width;
|
|
ulg height;
|
|
void *png_ptr;
|
|
void *info_ptr;
|
|
void (*mainprog_init)(void);
|
|
void (*mainprog_display_row)(ulg row_num);
|
|
void (*mainprog_finish_display)(void);
|
|
uch *image_data;
|
|
uch **row_pointers;
|
|
jmp_buf jmpbuf;
|
|
int passes; /* not used */
|
|
int rowbytes;
|
|
int channels;
|
|
int need_bgcolor;
|
|
int done;
|
|
uch bg_red;
|
|
uch bg_green;
|
|
uch bg_blue;
|
|
} mainprog_info;
|
|
|
|
|
|
/* prototypes for public functions in readpng2.c */
|
|
|
|
void readpng2_version_info(void);
|
|
|
|
int readpng2_check_sig(uch *sig, int num);
|
|
|
|
int readpng2_init(mainprog_info *mainprog_ptr);
|
|
|
|
int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
|
|
|
|
void readpng2_cleanup(mainprog_info *mainprog_ptr);
|