1 /*--------------------------------------------------------------------------- 2 3 rpng2 - progressive-model PNG display program readpng2.h 4 5 --------------------------------------------------------------------------- 6 7 Copyright (c) 1998-2008 Greg Roelofs. All rights reserved. 8 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 12 this software. 13 14 The contents of this file are DUAL-LICENSED. You may modify and/or 15 redistribute this software according to the terms of one of the 16 following two licenses (at your option): 17 18 19 LICENSE 1 ("BSD-like with advertising clause"): 20 21 Permission is granted to anyone to use this software for any purpose, 22 including commercial applications, and to alter it and redistribute 23 it freely, subject to the following restrictions: 24 25 1. Redistributions of source code must retain the above copyright 26 notice, disclaimer, and this list of conditions. 27 2. Redistributions in binary form must reproduce the above copyright 28 notice, disclaimer, and this list of conditions in the documenta- 29 tion and/or other materials provided with the distribution. 30 3. All advertising materials mentioning features or use of this 31 software must display the following acknowledgment: 32 33 This product includes software developed by Greg Roelofs 34 and contributors for the book, "PNG: The Definitive Guide," 35 published by O'Reilly and Associates. 36 37 38 LICENSE 2 (GNU GPL v2 or later): 39 40 This program is free software; you can redistribute it and/or modify 41 it under the terms of the GNU General Public License as published by 42 the Free Software Foundation; either version 2 of the License, or 43 (at your option) any later version. 44 45 This program is distributed in the hope that it will be useful, 46 but WITHOUT ANY WARRANTY; without even the implied warranty of 47 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 48 GNU General Public License for more details. 49 50 You should have received a copy of the GNU General Public License 51 along with this program; if not, write to the Free Software Foundation, 52 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 53 54 ---------------------------------------------------------------------------*/ 55 56 #ifndef TRUE 57 # define TRUE 1 58 # define FALSE 0 59 #endif 60 61 #ifndef MAX 62 # define MAX(a,b) ((a) > (b)? (a) : (b)) 63 # define MIN(a,b) ((a) < (b)? (a) : (b)) 64 #endif 65 66 #ifdef DEBUG 67 # define Trace(x) {fprintf x ; fflush(stderr); fflush(stdout);} 68 #else 69 # define Trace(x) ; 70 #endif 71 72 enum rpng2_states { 73 kPreInit = 0, 74 kWindowInit, 75 kDone 76 }; 77 78 typedef unsigned char uch; 79 typedef unsigned short ush; 80 typedef unsigned long ulg; 81 82 typedef struct _mainprog_info { 83 double display_exponent; 84 ulg width; 85 ulg height; 86 void *png_ptr; 87 void *info_ptr; 88 void (*mainprog_init)(void); 89 void (*mainprog_display_row)(ulg row_num); 90 void (*mainprog_finish_display)(void); 91 uch *image_data; 92 uch **row_pointers; 93 jmp_buf jmpbuf; 94 int passes; /* not used */ 95 int pass; 96 int rowbytes; 97 int channels; 98 int need_bgcolor; 99 #if (defined(__i386__) || defined(_M_IX86) || defined(__x86_64__)) 100 int nommxfilters; 101 int nommxcombine; 102 int nommxinterlace; 103 #endif 104 int state; 105 uch bg_red; 106 uch bg_green; 107 uch bg_blue; 108 } mainprog_info; 109 110 111 /* prototypes for public functions in readpng2.c */ 112 113 void readpng2_version_info(void); 114 115 int readpng2_check_sig(uch *sig, int num); 116 117 int readpng2_init(mainprog_info *mainprog_ptr); 118 119 int readpng2_decode_data(mainprog_info *mainprog_ptr, uch *rawbuf, ulg length); 120 121 void readpng2_cleanup(mainprog_info *mainprog_ptr); 122