86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
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/*---------------------------------------------------------------------------
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rpng2 - progressive-model PNG display program readpng2.h
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---------------------------------------------------------------------------
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Copyright (c) 1998-1999 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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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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---------------------------------------------------------------------------*/
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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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typedef struct _mainprog_info {
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double display_exponent;
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ulg width;
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ulg height;
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void *png_ptr;
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void *info_ptr;
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void (*mainprog_init)(void);
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void (*mainprog_display_row)(ulg row_num);
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void (*mainprog_finish_display)(void);
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uch *image_data;
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uch **row_pointers;
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jmp_buf jmpbuf;
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int passes; /* not used */
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int rowbytes;
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int channels;
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int need_bgcolor;
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int done;
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uch bg_red;
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uch bg_green;
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uch bg_blue;
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} mainprog_info;
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/* prototypes for public functions in readpng2.c */
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void readpng2_version_info(void);
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int readpng2_check_sig(uch *sig, int num);
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int readpng2_init(mainprog_info *mainprog_ptr);
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int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
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void readpng2_cleanup(mainprog_info *mainprog_ptr);
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