| 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) 1998-2008 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 | The contents of this file are DUAL-LICENSED. You may modify and/or
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| 15 | redistribute this software according to the terms of one of the
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| 16 | following two licenses (at your option):
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| 17 |
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| 18 |
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| 19 | LICENSE 1 ("BSD-like with advertising clause"):
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| 20 |
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| 21 | Permission is granted to anyone to use this software for any purpose,
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| 22 | including commercial applications, and to alter it and redistribute
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| 23 | it freely, subject to the following restrictions:
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| 24 |
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| 25 | 1. Redistributions of source code must retain the above copyright
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| 26 | notice, disclaimer, and this list of conditions.
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| 27 | 2. Redistributions in binary form must reproduce the above copyright
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| 28 | notice, disclaimer, and this list of conditions in the documenta-
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| 29 | tion and/or other materials provided with the distribution.
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| 30 | 3. All advertising materials mentioning features or use of this
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| 31 | software must display the following acknowledgment:
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| 32 |
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| 33 | This product includes software developed by Greg Roelofs
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| 34 | and contributors for the book, "PNG: The Definitive Guide,"
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| 35 | published by O'Reilly and Associates.
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| 36 |
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| 37 |
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| 38 | LICENSE 2 (GNU GPL v2 or later):
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| 39 |
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| 40 | This program is free software; you can redistribute it and/or modify
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| 41 | it under the terms of the GNU General Public License as published by
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| 42 | the Free Software Foundation; either version 2 of the License, or
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| 43 | (at your option) any later version.
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| 44 |
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| 45 | This program is distributed in the hope that it will be useful,
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| 46 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 47 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 48 | GNU General Public License for more details.
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| 49 |
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| 50 | You should have received a copy of the GNU General Public License
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| 51 | along with this program; if not, write to the Free Software Foundation,
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| 52 | Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 53 |
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| 54 | ---------------------------------------------------------------------------*/
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| 55 |
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| 56 | #ifndef TRUE
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| 57 | # define TRUE 1
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| 58 | # define FALSE 0
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| 59 | #endif
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| 60 |
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| 61 | #ifndef MAX
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| 62 | # define MAX(a,b) ((a) > (b)? (a) : (b))
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| 63 | # define MIN(a,b) ((a) < (b)? (a) : (b))
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| 64 | #endif
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| 65 |
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| 66 | #ifdef DEBUG
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| 67 | # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);}
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| 68 | #else
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| 69 | # define Trace(x) ;
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| 70 | #endif
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| 71 |
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| 72 | enum rpng2_states {
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| 73 | kPreInit = 0,
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| 74 | kWindowInit,
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| 75 | kDone
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| 76 | };
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| 77 |
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| 78 | typedef unsigned char uch;
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| 79 | typedef unsigned short ush;
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| 80 | typedef unsigned long ulg;
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| 81 |
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| 82 | typedef struct _mainprog_info {
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| 83 | double display_exponent;
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| 84 | ulg width;
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| 85 | ulg height;
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| 86 | void *png_ptr;
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| 87 | void *info_ptr;
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| 88 | void (*mainprog_init)(void);
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| 89 | void (*mainprog_display_row)(ulg row_num);
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| 90 | void (*mainprog_finish_display)(void);
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| 91 | uch *image_data;
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| 92 | uch **row_pointers;
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| 93 | jmp_buf jmpbuf;
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| 94 | int passes; /* not used */
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| 95 | int pass;
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| 96 | int rowbytes;
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| 97 | int channels;
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| 98 | int need_bgcolor;
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| 99 | #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__))
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| 100 | int nommxfilters;
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| 101 | int nommxcombine;
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| 102 | int nommxinterlace;
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| 103 | #endif
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| 104 | int state;
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| 105 | uch bg_red;
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| 106 | uch bg_green;
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| 107 | uch bg_blue;
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| 108 | } mainprog_info;
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| 109 |
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| 110 |
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| 111 | /* prototypes for public functions in readpng2.c */
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| 112 |
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| 113 | void readpng2_version_info(void);
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| 114 |
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| 115 | int readpng2_check_sig(uch *sig, int num);
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| 116 |
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| 117 | int readpng2_init(mainprog_info *mainprog_ptr);
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| 118 |
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| 119 | int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length);
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| 120 |
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| 121 | void readpng2_cleanup(mainprog_info *mainprog_ptr);
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