| 1 | /*---------------------------------------------------------------------------
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| 2 |
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| 3 | rpng2 - progressive-model PNG display program readpng2.h
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| 4 |
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| 5 | ---------------------------------------------------------------------------
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| 6 |
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| 7 | Copyright (c) 1998-2001 Greg Roelofs. All rights reserved.
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| 8 |
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| 9 | This software is provided "as is," without warranty of any kind,
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| 10 | express or implied. In no event shall the author or contributors
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| 11 | be held liable for any damages arising in any way from the use of
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| 12 | this software.
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| 13 |
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| 14 | Permission is granted to anyone to use this software for any purpose,
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| 15 | including commercial applications, and to alter it and redistribute
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| 16 | it freely, subject to the following restrictions:
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| 17 |
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| 18 | 1. Redistributions of source code must retain the above copyright
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| 19 | notice, disclaimer, and this list of conditions.
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| 20 | 2. Redistributions in binary form must reproduce the above copyright
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| 21 | notice, disclaimer, and this list of conditions in the documenta-
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| 22 | tion and/or other materials provided with the distribution.
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| 23 | 3. All advertising materials mentioning features or use of this
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| 24 | software must display the following acknowledgment:
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| 25 |
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| 26 | This product includes software developed by Greg Roelofs
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| 27 | and contributors for the book, "PNG: The Definitive Guide,"
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| 28 | published by O'Reilly and Associates.
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| 29 |
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| 30 | ---------------------------------------------------------------------------*/
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| 31 |
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| 32 | #ifndef TRUE
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| 33 | # define TRUE 1
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| 34 | # define FALSE 0
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| 35 | #endif
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| 36 |
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| 37 | #ifndef MAX
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| 38 | # define MAX(a,b) ((a) > (b)? (a) : (b))
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| 39 | # define MIN(a,b) ((a) < (b)? (a) : (b))
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| 40 | #endif
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| 41 |
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| 42 | #ifdef DEBUG
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| 43 | # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
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| 44 | #else
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| 45 | # define Trace(x) ;
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| 46 | #endif
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| 47 |
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| 48 | typedef unsigned char uch;
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| 49 | typedef unsigned short ush;
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| 50 | typedef unsigned long ulg;
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| 51 |
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| 52 | typedef struct _mainprog_info {
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| 53 | double display_exponent;
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| 54 | ulg width;
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| 55 | ulg height;
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| 56 | void *png_ptr;
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| 57 | void *info_ptr;
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| 58 | void (*mainprog_init)(void);
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| 59 | void (*mainprog_display_row)(ulg row_num);
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| 60 | void (*mainprog_finish_display)(void);
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| 61 | uch *image_data;
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| 62 | uch **row_pointers;
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| 63 | jmp_buf jmpbuf;
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| 64 | int passes; /* not used */
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| 65 | int pass;
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| 66 | int rowbytes;
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| 67 | int channels;
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| 68 | int need_bgcolor;
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| 69 | #if (defined(__i386__) || defined(_M_IX86))
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| 70 | int nommxfilters;
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| 71 | int nommxcombine;
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| 72 | int nommxinterlace;
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| 73 | #endif
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| 74 | int done;
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| 75 | uch bg_red;
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| 76 | uch bg_green;
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| 77 | uch bg_blue;
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| 78 | } mainprog_info;
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| 79 |
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| 80 |
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| 81 | /* prototypes for public functions in readpng2.c */
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| 82 |
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| 83 | void readpng2_version_info(void);
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| 84 |
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| 85 | int readpng2_check_sig(uch *sig, int num);
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| 86 |
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| 87 | int readpng2_init(mainprog_info *mainprog_ptr);
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| 88 |
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| 89 | int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
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| 90 |
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| 91 | void readpng2_cleanup(mainprog_info *mainprog_ptr);
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