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annotate ext/libpng-1.2.29/contrib/gregbook/readpng2.h @ 140:3fddb45c0304

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edited the loaders, images are now loaded only once into memory
author thebastion@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 28 Sep 2008 11:12:36 +0000
parents 4a0efb7baf70
children
rev   line source
0
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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1 /*---------------------------------------------------------------------------
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2
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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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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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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7 Copyright (c) 1998-2008 Greg Roelofs. All rights reserved.
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8
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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9 This software is provided "as is," without warranty of any kind,
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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10 express or implied. In no event shall the author or contributors
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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11 be held liable for any damages arising in any way from the use of
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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12 this software.
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13
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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14 The contents of this file are DUAL-LICENSED. You may modify and/or
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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15 redistribute this software according to the terms of one of the
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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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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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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19 LICENSE 1 ("BSD-like with advertising clause"):
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20
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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21 Permission is granted to anyone to use this software for any purpose,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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22 including commercial applications, and to alter it and redistribute
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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23 it freely, subject to the following restrictions:
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24
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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25 1. Redistributions of source code must retain the above copyright
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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26 notice, disclaimer, and this list of conditions.
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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27 2. Redistributions in binary form must reproduce the above copyright
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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28 notice, disclaimer, and this list of conditions in the documenta-
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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29 tion and/or other materials provided with the distribution.
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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30 3. All advertising materials mentioning features or use of this
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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31 software must display the following acknowledgment:
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32
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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33 This product includes software developed by Greg Roelofs
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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34 and contributors for the book, "PNG: The Definitive Guide,"
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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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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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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38 LICENSE 2 (GNU GPL v2 or later):
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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39
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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40 This program is free software; you can redistribute it and/or modify
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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41 it under the terms of the GNU General Public License as published by
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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42 the Free Software Foundation; either version 2 of the License, or
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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43 (at your option) any later version.
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44
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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45 This program is distributed in the hope that it will be useful,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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46 but WITHOUT ANY WARRANTY; without even the implied warranty of
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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47 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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48 GNU General Public License for more details.
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49
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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50 You should have received a copy of the GNU General Public License
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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51 along with this program; if not, write to the Free Software Foundation,
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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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
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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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
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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121 void readpng2_cleanup(mainprog_info *mainprog_ptr);