1 | /* |
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2 | * Imaging tools for cacaview and img2irc |
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3 | * Copyright (c) 2003-2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: common-image.c 1462 2006-12-12 01:53:54Z sam $ |
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7 | * |
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8 | * This program is free software. It comes without any warranty, to |
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9 | * the extent permitted by applicable law. You can redistribute it |
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10 | * and/or modify it under the terms of the Do What The Fuck You Want |
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11 | * To Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | #include "config.h" |
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16 | #include "common.h" |
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17 | |
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18 | #if !defined(__KERNEL__) |
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19 | # include <stdio.h> |
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20 | # include <string.h> |
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21 | # include <stdlib.h> |
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22 | #endif |
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23 | |
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24 | #if defined(USE_IMLIB2) |
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25 | # include <Imlib2.h> |
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26 | #else |
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27 | # if !defined(__KERNEL__) |
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28 | # include <stdio.h> |
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29 | # endif |
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30 | #endif |
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31 | |
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32 | #include "cucul.h" |
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33 | #include "common-image.h" |
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34 | |
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35 | #if !defined(USE_IMLIB2) |
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36 | static unsigned int u32fread(FILE *); |
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37 | static unsigned int u16fread(FILE *); |
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38 | static unsigned int u8fread(FILE *); |
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39 | #endif |
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40 | |
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41 | struct image * load_image(char const * name) |
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42 | { |
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43 | struct image * im = malloc(sizeof(struct image)); |
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44 | unsigned int depth, bpp, rmask, gmask, bmask, amask; |
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45 | |
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46 | #if defined(USE_IMLIB2) |
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47 | Imlib_Image image; |
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48 | |
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49 | /* Load the new image */ |
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50 | image = imlib_load_image(name); |
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51 | |
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52 | if(!image) |
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53 | { |
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54 | free(im); |
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55 | return NULL; |
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56 | } |
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57 | |
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58 | imlib_context_set_image(image); |
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59 | im->pixels = (char *)imlib_image_get_data_for_reading_only(); |
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60 | im->w = imlib_image_get_width(); |
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61 | im->h = imlib_image_get_height(); |
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62 | rmask = 0x00ff0000; |
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63 | gmask = 0x0000ff00; |
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64 | bmask = 0x000000ff; |
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65 | amask = 0xff000000; |
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66 | bpp = 32; |
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67 | depth = 4; |
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68 | |
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69 | /* Create the libcucul dither */ |
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70 | im->dither = cucul_create_dither(bpp, im->w, im->h, depth * im->w, |
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71 | rmask, gmask, bmask, amask); |
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72 | if(!im->dither) |
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73 | { |
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74 | imlib_free_image(); |
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75 | free(im); |
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76 | return NULL; |
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77 | } |
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78 | |
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79 | im->priv = (void *)image; |
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80 | |
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81 | #else |
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82 | /* Try to load a BMP file */ |
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83 | unsigned int red[256], green[256], blue[256], alpha[256]; |
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84 | unsigned int i, colors, offset, tmp, planes; |
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85 | FILE *fp; |
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86 | |
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87 | fp = fopen(name, "rb"); |
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88 | if(!fp) |
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89 | { |
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90 | free(im); |
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91 | return NULL; |
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92 | } |
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93 | |
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94 | if(u16fread(fp) != 0x4d42) |
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95 | { |
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96 | fclose(fp); |
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97 | free(im); |
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98 | return NULL; |
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99 | } |
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100 | |
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101 | u32fread(fp); /* size */ |
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102 | u16fread(fp); /* reserved 1 */ |
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103 | u16fread(fp); /* reserved 2 */ |
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104 | |
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105 | offset = u32fread(fp); |
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106 | |
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107 | tmp = u32fread(fp); /* header size */ |
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108 | if(tmp == 40) |
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109 | { |
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110 | im->w = u32fread(fp); |
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111 | im->h = u32fread(fp); |
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112 | planes = u16fread(fp); |
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113 | bpp = u16fread(fp); |
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114 | |
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115 | tmp = u32fread(fp); /* compression */ |
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116 | if(tmp != 0) |
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117 | { |
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118 | fclose(fp); |
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119 | free(im); |
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120 | return NULL; |
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121 | } |
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122 | |
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123 | u32fread(fp); /* sizeimage */ |
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124 | u32fread(fp); /* xpelspermeter */ |
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125 | u32fread(fp); /* ypelspermeter */ |
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126 | u32fread(fp); /* biclrused */ |
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127 | u32fread(fp); /* biclrimportantn */ |
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128 | |
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129 | colors = (offset - 54) / 4; |
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130 | for(i = 0; i < colors && i < 256; i++) |
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131 | { |
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132 | blue[i] = u8fread(fp) * 16; |
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133 | green[i] = u8fread(fp) * 16; |
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134 | red[i] = u8fread(fp) * 16; |
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135 | alpha[i] = 0; |
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136 | u8fread(fp); |
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137 | } |
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138 | } |
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139 | else if(tmp == 12) |
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140 | { |
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141 | im->w = u32fread(fp); |
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142 | im->h = u32fread(fp); |
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143 | planes = u16fread(fp); |
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144 | bpp = u16fread(fp); |
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145 | |
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146 | colors = (offset - 26) / 3; |
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147 | for(i = 0; i < colors && i < 256; i++) |
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148 | { |
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149 | blue[i] = u8fread(fp); |
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150 | green[i] = u8fread(fp); |
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151 | red[i] = u8fread(fp); |
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152 | alpha[i] = 0; |
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153 | } |
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154 | } |
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155 | else |
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156 | { |
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157 | fclose(fp); |
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158 | free(im); |
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159 | return NULL; |
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160 | } |
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161 | |
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162 | /* Fill the rest of the palette */ |
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163 | for(i = colors; i < 256; i++) |
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164 | blue[i] = green[i] = red[i] = alpha[i] = 0; |
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165 | |
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166 | depth = (bpp + 7) / 8; |
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167 | |
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168 | /* Sanity check */ |
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169 | if(!im->w || im->w > 0x10000 || !im->h || im->h > 0x10000 || planes != 1) |
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170 | { |
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171 | fclose(fp); |
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172 | free(im); |
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173 | return NULL; |
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174 | } |
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175 | |
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176 | /* Allocate the pixel buffer */ |
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177 | im->pixels = malloc(im->w * im->h * depth); |
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178 | if(!im->pixels) |
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179 | { |
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180 | fclose(fp); |
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181 | free(im); |
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182 | return NULL; |
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183 | } |
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184 | |
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185 | memset(im->pixels, 0, im->w * im->h * depth); |
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186 | |
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187 | /* Read the bitmap data */ |
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188 | for(i = im->h; i--; ) |
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189 | { |
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190 | unsigned int j, k, bits = 0; |
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191 | |
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192 | switch(bpp) |
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193 | { |
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194 | case 1: |
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195 | for(j = 0; j < im->w; j++) |
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196 | { |
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197 | k = j % 32; |
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198 | if(k == 0) |
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199 | bits = u32fread(fp); |
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200 | im->pixels[im->w * i * depth + j] = |
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201 | (bits >> ((k & ~0xf) + 0xf - (k & 0xf))) & 0x1; |
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202 | } |
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203 | break; |
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204 | case 4: |
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205 | for(j = 0; j < im->w; j++) |
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206 | { |
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207 | k = j % 8; |
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208 | if(k == 0) |
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209 | bits = u32fread(fp); |
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210 | im->pixels[im->w * i * depth + j] = |
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211 | (bits >> (4 * ((k & ~0x1) + 0x1 - (k & 0x1)))) & 0xf; |
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212 | } |
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213 | break; |
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214 | default: |
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215 | /* Works for 8bpp, but also for 16, 24 etc. */ |
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216 | fread(im->pixels + im->w * i * depth, im->w * depth, 1, fp); |
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217 | /* Pad reads to 4 bytes */ |
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218 | tmp = (im->w * depth) % 4; |
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219 | tmp = (4 - tmp) % 4; |
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220 | while(tmp--) |
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221 | u8fread(fp); |
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222 | break; |
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223 | } |
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224 | } |
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225 | |
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226 | switch(depth) |
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227 | { |
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228 | case 3: |
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229 | rmask = 0xff0000; |
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230 | gmask = 0x00ff00; |
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231 | bmask = 0x0000ff; |
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232 | amask = 0x000000; |
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233 | break; |
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234 | case 2: /* XXX: those are the 16 bits values */ |
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235 | rmask = 0x7c00; |
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236 | gmask = 0x03e0; |
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237 | bmask = 0x001f; |
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238 | amask = 0x0000; |
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239 | break; |
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240 | case 1: |
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241 | default: |
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242 | bpp = 8; |
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243 | rmask = gmask = bmask = amask = 0; |
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244 | break; |
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245 | } |
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246 | |
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247 | fclose(fp); |
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248 | |
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249 | /* Create the libcucul dither */ |
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250 | im->dither = cucul_create_dither(bpp, im->w, im->h, depth * im->w, |
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251 | rmask, gmask, bmask, amask); |
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252 | if(!im->dither) |
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253 | { |
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254 | free(im->pixels); |
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255 | free(im); |
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256 | return NULL; |
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257 | } |
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258 | |
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259 | if(bpp == 8) |
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260 | cucul_set_dither_palette(im->dither, red, green, blue, alpha); |
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261 | #endif |
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262 | |
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263 | return im; |
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264 | } |
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265 | |
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266 | void unload_image(struct image * im) |
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267 | { |
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268 | #if defined(USE_IMLIB2) |
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269 | /* Imlib_Image image = (Imlib_Image)im->priv; */ |
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270 | imlib_free_image(); |
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271 | #else |
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272 | free(im->pixels); |
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273 | #endif |
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274 | cucul_free_dither(im->dither); |
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275 | } |
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276 | |
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277 | #if !defined(USE_IMLIB2) |
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278 | static unsigned int u32fread(FILE *fp) |
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279 | { |
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280 | unsigned char buffer[4]; |
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281 | fread(buffer, 4, 1, fp); |
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282 | return ((unsigned int)buffer[3] << 24) | ((unsigned int)buffer[2] << 16) |
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283 | | ((unsigned int)buffer[1] << 8) | ((unsigned int)buffer[0]); |
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284 | } |
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285 | |
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286 | static unsigned int u16fread(FILE *fp) |
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287 | { |
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288 | unsigned char buffer[2]; |
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289 | fread(buffer, 2, 1, fp); |
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290 | return ((unsigned int)buffer[1] << 8) | ((unsigned int)buffer[0]); |
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291 | } |
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292 | |
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293 | static unsigned int u8fread(FILE *fp) |
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294 | { |
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295 | unsigned char buffer; |
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296 | fread(&buffer, 1, 1, fp); |
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297 | return (unsigned int)buffer; |
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298 | } |
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299 | #endif |
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300 | |
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