Mercurial > fife-parpg

annotate ext/libpng-1.2.29/contrib/gregbook/readppm.c @ 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
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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3 rpng - simple PNG display program readppm.c
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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 This is a special-purpose replacement for readpng.c that allows binary
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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8 PPM files to be used in place of PNG images.
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9
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10 ---------------------------------------------------------------------------
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11
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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12 Copyright (c) 1998-2007 Greg Roelofs. All rights reserved.
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13
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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14 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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15 express or implied. In no event shall the author or contributors
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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16 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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17 this software.
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18
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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19 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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20 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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21 following two licenses (at your option):
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22
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23
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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24 LICENSE 1 ("BSD-like with advertising clause"):
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25
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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26 Permission is granted to anyone to use this software for any purpose,
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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27 including commercial applications, and to alter it and redistribute
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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28 it freely, subject to the following restrictions:
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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29
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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30 1. Redistributions of source code must retain the above copyright
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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31 notice, disclaimer, and this list of conditions.
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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32 2. Redistributions in binary form must reproduce the above copyright
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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33 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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34 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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35 3. All advertising materials mentioning features or use of this
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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36 software must display the following acknowledgment:
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37
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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38 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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39 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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40 published by O'Reilly and Associates.
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41
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42
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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43 LICENSE 2 (GNU GPL v2 or later):
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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44
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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45 This program is free software; you can redistribute it and/or modify
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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46 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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47 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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48 (at your option) any later version.
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49
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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50 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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51 but WITHOUT ANY WARRANTY; without even the implied warranty of
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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52 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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53 GNU General Public License for more details.
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54
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55 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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56 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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57 Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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58
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59 ---------------------------------------------------------------------------*/
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60
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61 #include <stdio.h>
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62 #include <stdlib.h>
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63
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64 #include "readpng.h" /* typedefs, common macros, public prototypes */
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65
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66
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67 ulg width, height;
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68 int bit_depth, color_type, channels;
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69 uch *image_data = NULL;
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70 FILE *saved_infile;
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71
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72
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73 void readpng_version_info()
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74 {
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75 fprintf(stderr, " Compiled without libpng, zlib or PBMPLUS/NetPBM.\n");
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76 }
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77
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78
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79 /* return value = 0 for success, 1 for bad sig, 2 for bad IHDR, 4 for no mem */
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80
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81 int readpng_init(FILE *infile, ulg *pWidth, ulg *pHeight)
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82 {
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83 static uch ppmline[256];
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84 int maxval;
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85
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86
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87 saved_infile = infile;
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88
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89 fgets(ppmline, 256, infile);
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90 if (ppmline[0] != 'P' || ppmline[1] != '6') {
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91 fprintf(stderr, "ERROR: not a PPM file\n");
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92 return 1;
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93 }
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94 /* possible color types: P5 = grayscale (0), P6 = RGB (2), P8 = RGBA (6) */
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95 if (ppmline[1] == '6') {
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96 color_type = 2;
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97 channels = 3;
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98 } else if (ppmline[1] == '8') {
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99 color_type = 6;
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100 channels = 4;
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101 } else /* if (ppmline[1] == '5') */ {
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102 color_type = 0;
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103 channels = 1;
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104 }
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105
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106 do {
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107 fgets(ppmline, 256, infile);
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108 } while (ppmline[0] == '#');
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109 sscanf(ppmline, "%lu %lu", &width, &height);
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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110
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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diff changeset
111 do {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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112 fgets(ppmline, 256, infile);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
113 } while (ppmline[0] == '#');
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
114 sscanf(ppmline, "%d", &maxval);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
115 if (maxval != 255) {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
116 fprintf(stderr, "ERROR: maxval = %d\n", maxval);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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117 return 2;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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118 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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119 bit_depth = 8;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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120
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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121 *pWidth = width;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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122 *pHeight = height;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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123
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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124 return 0;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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125 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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126
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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127
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mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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128
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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129
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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130 /* returns 0 if succeeds, 1 if fails due to no bKGD chunk, 2 if libpng error;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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131 * scales values to 8-bit if necessary */
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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132
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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133 int readpng_get_bgcolor(uch *red, uch *green, uch *blue)
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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134 {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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135 return 1;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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136 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
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137
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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138
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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139
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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140
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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141 /* display_exponent == LUT_exponent * CRT_exponent */
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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142
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
143 uch *readpng_get_image(double display_exponent, int *pChannels, ulg *pRowbytes)
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
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144 {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
145 ulg rowbytes;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
146
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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147
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
148 /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
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149 * transparency chunks to full alpha channel; strip 16-bit-per-sample
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
150 * images to 8 bits per sample; and convert grayscale to RGB[A] */
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
151
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
152 /* GRR WARNING: grayscale needs to be expanded and channels reset! */
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
153
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
154 *pRowbytes = rowbytes = channels*width;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
155 *pChannels = channels;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
156
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
157 if ((image_data = (uch *)malloc(rowbytes*height)) == NULL) {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
158 return NULL;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
159 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
160
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
161 Trace((stderr, "readpng_get_image: rowbytes = %ld, height = %ld\n", rowbytes, height));
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
162
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
163
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
164 /* now we can go ahead and just read the whole image */
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
165
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
166 fread(image_data, 1L, rowbytes*height, saved_infile);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
167
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
168
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
169 return image_data;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
170 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
171
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
172
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
173 void readpng_cleanup(int free_image_data)
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
174 {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
175 if (free_image_data && image_data) {
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
176 free(image_data);
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
177 image_data = NULL;
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
178 }
4a0efb7baf70 * Datasets becomes the new trunk and retires after that :-)
mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
179 }