1 | /* |
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2 | * filters.c: various image filters |
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3 | * $Id: filters.c 424 2005-01-05 17:08:50Z sam $ |
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4 | * |
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5 | * Copyright: (c) 2004 Sam Hocevar <sam@zoy.org> |
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6 | * This program is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the Do What The Fuck You Want To |
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8 | * Public License as published by Banlu Kemiyatorn. See |
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9 | * http://sam.zoy.org/projects/COPYING.WTFPL for more details. |
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10 | */ |
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11 | |
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12 | #include <stdio.h> |
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13 | #include <stdlib.h> |
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14 | #include <string.h> |
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15 | #include <math.h> |
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16 | |
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17 | #include "config.h" |
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18 | #include "common.h" |
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19 | |
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20 | /* Our macros */ |
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21 | #define FACTOR 1 |
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22 | //#define FONTNAME "share/font.png" // use with FACTOR = 2 |
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23 | //#define FONTNAME "share/font_dilated.png" // use with FACTOR = 2 |
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24 | #define FONTNAME "share/font_dilated_half.png" // use with FACTOR = 1 |
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25 | |
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26 | /* Functions */ |
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27 | void filter_flood_fill(struct image *img, int x, int y, int r, int g, int b) |
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28 | { |
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29 | int oldr, oldg, oldb; |
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30 | int nextr, nextg, nextb; |
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31 | |
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32 | if(x < 0 || y < 0 || x >= img->width || y >= img->height) |
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33 | return; |
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34 | |
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35 | getpixel(img, x, y, &oldr, &oldg, &oldb); |
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36 | setpixel(img, x, y, r, g, b); |
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37 | |
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38 | getpixel(img, x + 1, y, &nextr, &nextg, &nextb); |
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39 | if(nextr == oldr && nextg == oldg && nextb == oldb) |
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40 | filter_flood_fill(img, x + 1, y, r, g, b); |
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41 | |
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42 | getpixel(img, x - 1, y, &nextr, &nextg, &nextb); |
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43 | if(nextr == oldr && nextg == oldg && nextb == oldb) |
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44 | filter_flood_fill(img, x - 1, y, r, g, b); |
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45 | |
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46 | getpixel(img, x, y + 1, &nextr, &nextg, &nextb); |
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47 | if(nextr == oldr && nextg == oldg && nextb == oldb) |
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48 | filter_flood_fill(img, x, y + 1, r, g, b); |
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49 | |
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50 | getpixel(img, x, y - 1, &nextr, &nextg, &nextb); |
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51 | if(nextr == oldr && nextg == oldg && nextb == oldb) |
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52 | filter_flood_fill(img, x, y - 1, r, g, b); |
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53 | } |
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54 | |
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55 | struct image *filter_dup(struct image *img) |
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56 | { |
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57 | struct image *dst; |
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58 | int x, y; |
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59 | int r, g, b; |
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60 | |
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61 | dst = image_new(img->width, img->height); |
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62 | |
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63 | for(y = 0; y < img->height; y++) |
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64 | for(x = 0; x < img->width; x++) |
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65 | { |
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66 | getpixel(img, x, y, &r, &g, &b); |
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67 | setpixel(dst, x, y, r, g, b); |
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68 | } |
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69 | |
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70 | return dst; |
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71 | } |
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72 | |
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73 | struct image *filter_scale(struct image *img, float ratio) |
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74 | { |
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75 | struct image *dst; |
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76 | int w, h, x, y; |
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77 | int r, g, b; |
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78 | |
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79 | w = ratio * img->width; |
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80 | h = ratio * img->height; |
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81 | |
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82 | dst = image_new(w, h); |
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83 | |
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84 | for(y = 0; y < h; y++) |
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85 | for(x = 0; x < w; x++) |
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86 | { |
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87 | getpixel(img, x / ratio, y / ratio, &r, &g, &b); |
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88 | setpixel(dst, x, y, r, g, b); |
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89 | } |
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90 | |
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91 | return dst; |
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92 | } |
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93 | |
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94 | struct image *filter_fill_holes(struct image *img) |
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95 | { |
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96 | struct image *dst; |
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97 | int x, y; |
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98 | int r, g, b; |
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99 | |
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100 | dst = image_new(img->width, img->height); |
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101 | |
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102 | for(y = 0; y < img->height; y++) |
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103 | for(x = 0; x < img->width; x++) |
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104 | { |
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105 | getpixel(img, x, y, &r, &g, &b); |
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106 | setpixel(dst, x, y, r, g, b); |
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107 | } |
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108 | |
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109 | for(y = 0; y < dst->height; y++) |
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110 | for(x = 2; x < dst->width - 2; x++) |
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111 | { |
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112 | int c1, c2, c3, c4, c5; |
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113 | getpixel(img, x-2, y, &c1, &g, &b); |
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114 | getpixel(img, x-1, y, &c2, &g, &b); |
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115 | getpixel(img, x, y, &c3, &g, &b); |
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116 | getpixel(img, x+1, y, &c4, &g, &b); |
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117 | getpixel(img, x+2, y, &c5, &g, &b); |
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118 | if(c1 < 127 && c2 < 127 && c3 > 128 && c4 < 127) |
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119 | c3 = (c1 + c2 + c4) / 3; |
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120 | else if(c2 < 127 && c3 > 128 && c4 < 127 && c5 < 127) |
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121 | c3 = (c2 + c4 + c5) / 3; |
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122 | setpixel(dst, x, y, c3, c3, c3); |
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123 | } |
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124 | |
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125 | for(x = 0; x < dst->width; x++) |
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126 | for(y = 2; y < dst->height - 2; y++) |
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127 | { |
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128 | int c1, c2, c3, c4, c5; |
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129 | getpixel(img, x, y-2, &c1, &g, &b); |
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130 | getpixel(img, x, y-1, &c2, &g, &b); |
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131 | getpixel(img, x, y, &c3, &g, &b); |
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132 | getpixel(img, x, y+1, &c4, &g, &b); |
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133 | getpixel(img, x, y+2, &c5, &g, &b); |
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134 | if(c1 < 127 && c2 < 127 && c3 > 128 && c4 < 127) |
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135 | c3 = (c1 + c2 + c4) / 3; |
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136 | else if(c2 < 127 && c3 > 128 && c4 < 127 && c5 < 127) |
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137 | c3 = (c2 + c4 + c5) / 3; |
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138 | setpixel(dst, x, y, c3, c3, c3); |
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139 | } |
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140 | |
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141 | return dst; |
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142 | } |
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143 | |
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144 | struct image *filter_black_stuff(struct image *img) |
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145 | { |
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146 | struct image *dst; |
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147 | int x, y; |
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148 | int r, ra, rb, g, b; |
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149 | |
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150 | dst = image_new(img->width, img->height); |
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151 | |
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152 | /* Remove vertical stuff */ |
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153 | for(y = 0; y < img->height; y++) |
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154 | for(x = 0; x < img->width; x++) |
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155 | { |
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156 | getpixel(img, x, y, &r, &g, &b); |
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157 | setpixel(dst, x, y, r, g, b); |
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158 | if(y > 0 && y < img->height - 1) |
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159 | { |
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160 | getpixel(img, x, y - 1, &ra, &g, &b); |
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161 | getpixel(img, x, y + 1, &rb, &g, &b); |
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162 | if(r < ra && (r - ra) * (r - rb) > 5000) |
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163 | setpixel(dst, x, y, ra, ra, ra); |
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164 | } |
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165 | } |
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166 | |
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167 | /* Remove horizontal stuff */ |
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168 | for(y = 0; y < img->height; y++) |
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169 | for(x = 0; x < img->width; x++) |
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170 | { |
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171 | getpixel(img, x, y, &r, &g, &b); |
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172 | if(x > 0 && x < img->width - 1) |
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173 | { |
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174 | getpixel(dst, x - 1, y, &ra, &g, &b); |
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175 | getpixel(dst, x + 1, y, &rb, &g, &b); |
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176 | if(r < ra && (r - ra) * (r - rb) > 5000) |
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177 | setpixel(dst, x, y, ra, ra, ra); |
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178 | } |
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179 | } |
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180 | |
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181 | return dst; |
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182 | } |
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183 | |
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184 | struct image *filter_detect_lines(struct image *img) |
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185 | { |
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186 | struct image *dst; |
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187 | int x, y; |
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188 | int r, ra, rb, g, b; |
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189 | |
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190 | dst = image_new(img->width, img->height); |
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191 | |
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192 | /* Remove white lines */ |
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193 | for(y = 0; y < img->height; y++) |
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194 | for(x = 0; x < img->width; x++) |
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195 | { |
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196 | getpixel(img, x, y, &r, &g, &b); |
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197 | setpixel(dst, x, y, r, g, b); |
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198 | if(y > 0 && y < img->height - 1) |
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199 | { |
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200 | getpixel(img, x, y - 1, &ra, &g, &b); |
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201 | getpixel(img, x, y + 1, &rb, &g, &b); |
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202 | if(r > ra && (r - ra) * (r - rb) > 5000) |
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203 | setpixel(dst, x, y, ra, ra, ra); |
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204 | } |
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205 | } |
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206 | |
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207 | /* Remove black lines */ |
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208 | for(y = 0; y < img->height; y++) |
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209 | for(x = 0; x < img->width; x++) |
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210 | { |
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211 | getpixel(dst, x, y, &r, &g, &b); |
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212 | if(y > 0 && y < img->height - 1) |
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213 | { |
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214 | getpixel(img, x, y - 1, &ra, &g, &b); |
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215 | getpixel(img, x, y + 1, &rb, &g, &b); |
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216 | if(r < ra && (r - ra) * (r - rb) > 500) |
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217 | setpixel(dst, x, y, ra, ra, ra); |
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218 | } |
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219 | } |
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220 | |
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221 | return dst; |
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222 | } |
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223 | |
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224 | struct image *filter_equalize(struct image *img, int threshold) |
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225 | { |
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226 | struct image *dst; |
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227 | int x, y; |
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228 | int r, g, b; |
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229 | int min = 0, max = 255; |
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230 | |
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231 | dst = image_new(img->width, img->height); |
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232 | |
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233 | if(threshold < 0) |
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234 | { |
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235 | min = 255; |
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236 | max = 0; |
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237 | threshold = -threshold; |
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238 | } |
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239 | |
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240 | threshold *= 3; |
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241 | |
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242 | for(y = 0; y < img->height; y++) |
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243 | for(x = 0; x < img->width; x++) |
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244 | { |
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245 | getpixel(img, x, y, &r, &g, &b); |
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246 | if(r + g + b < threshold) |
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247 | setpixel(dst, x, y, min, min, min); |
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248 | else |
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249 | setpixel(dst, x, y, max, max, max); |
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250 | } |
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251 | |
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252 | return dst; |
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253 | } |
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254 | |
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255 | struct image *filter_trick(struct image *img) |
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256 | { |
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257 | #define TSIZE 3 |
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258 | struct image *dst; |
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259 | int x, y, i, j, val, m, more, l, less; |
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260 | int r, g, b; |
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261 | |
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262 | dst = image_new(img->width, img->height); |
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263 | |
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264 | for(y = 0; y < img->height; y++) |
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265 | for(x = 0; x < img->width; x++) |
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266 | setpixel(dst, x, y, 255, 255, 255); |
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267 | |
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268 | for(y = TSIZE/2; y < img->height - TSIZE/2; y++) |
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269 | for(x = TSIZE/2; x < img->width - TSIZE/2; x++) |
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270 | { |
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271 | getpixel(img, x + TSIZE - TSIZE/2, y + TSIZE - TSIZE/2, &val, &g, &b); |
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272 | m = more = l = less = 0; |
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273 | for(i = 0; i < TSIZE; i++) |
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274 | for(j = 0; j < TSIZE; j++) |
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275 | { |
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276 | getpixel(img, x + j - TSIZE/2, y + i - TSIZE/2, &r, &g, &b); |
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277 | if(r > val) |
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278 | { |
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279 | more += r; |
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280 | m++; |
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281 | } |
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282 | else if(r < val) |
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283 | { |
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284 | less += r; |
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285 | l++; |
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286 | } |
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287 | } |
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288 | |
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289 | if(l >= 6) |
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290 | i = less / l; |
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291 | else if(m >= 6) |
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292 | i = more / m; |
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293 | else |
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294 | i = val; |
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295 | setpixel(dst, x, y, i, i, i); |
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296 | } |
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297 | |
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298 | return dst; |
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299 | } |
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300 | |
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301 | struct image *filter_smooth(struct image *img) |
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302 | { |
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303 | #define SSIZE 3 |
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304 | struct image *dst; |
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305 | int x, y, i, j, val; |
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306 | int r, g, b; |
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307 | |
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308 | dst = image_new(img->width, img->height); |
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309 | |
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310 | for(y = 0; y < img->height; y++) |
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311 | for(x = 0; x < img->width; x++) |
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312 | setpixel(dst, x, y, 255, 255, 255); |
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313 | |
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314 | for(y = SSIZE/2; y < img->height - SSIZE/2; y++) |
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315 | for(x = SSIZE/2; x < img->width - SSIZE/2; x++) |
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316 | { |
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317 | val = 0; |
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318 | for(i = 0; i < SSIZE; i++) |
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319 | for(j = 0; j < SSIZE; j++) |
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320 | { |
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321 | getpixel(img, x + j - SSIZE/2, y + i - SSIZE/2, &r, &g, &b); |
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322 | val += r; |
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323 | } |
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324 | |
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325 | i = val / (SSIZE * SSIZE); |
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326 | setpixel(dst, x, y, i, i, i); |
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327 | } |
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328 | |
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329 | return dst; |
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330 | } |
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331 | |
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332 | struct image *filter_median(struct image *img) |
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333 | { |
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334 | #define MSIZE 3 |
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335 | struct image *dst; |
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336 | int x, y, i, j, val[MSIZE*MSIZE]; |
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337 | int r, g, b; |
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338 | |
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339 | dst = image_new(img->width, img->height); |
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340 | |
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341 | for(y = 0; y < img->height; y++) |
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342 | for(x = 0; x < img->width; x++) |
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343 | setpixel(dst, x, y, 255, 255, 255); |
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344 | |
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345 | for(y = MSIZE/2; y < img->height - MSIZE/2; y++) |
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346 | for(x = MSIZE/2; x < img->width - MSIZE/2; x++) |
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347 | { |
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348 | for(i = 0; i < MSIZE; i++) |
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349 | for(j = 0; j < MSIZE; j++) |
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350 | { |
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351 | getpixel(img, x + j - SSIZE/2, y + i - SSIZE/2, &r, &g, &b); |
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352 | val[i * MSIZE + j] = r; |
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353 | } |
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354 | |
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355 | /* Bubble sort power! */ |
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356 | for(i = 0; i < MSIZE * MSIZE / 2 + 1; i++) |
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357 | for(j = i + 1; j < MSIZE * MSIZE; j++) |
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358 | if(val[i] > val[j]) |
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359 | { |
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360 | register int k = val[i]; |
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361 | val[i] = val[j]; |
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362 | val[j] = k; |
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363 | } |
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364 | |
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365 | i = val[MSIZE * MSIZE / 2]; |
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366 | setpixel(dst, x, y, i, i, i); |
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367 | } |
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368 | |
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369 | return dst; |
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370 | } |
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371 | |
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372 | struct image *filter_contrast(struct image *img) |
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373 | { |
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374 | struct image *dst; |
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375 | int histo[256]; |
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376 | int x, y, i, min = 255, max = 0; |
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377 | int r, g, b; |
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378 | |
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379 | dst = image_new(img->width, img->height); |
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380 | |
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381 | for(y = 0; y < img->height; y++) |
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382 | for(x = 0; x < img->width; x++) |
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383 | { |
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384 | getgray(img, x, y, &r); |
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385 | if(r < min) min = r; |
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386 | if(r > max) max = r; |
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387 | } |
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388 | |
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389 | if(min == max) |
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390 | histo[min] = 127; |
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391 | else |
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392 | for(i = min; i < max; i++) |
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393 | histo[i] = (i - min) * 255 / (max - min); |
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394 | |
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395 | for(y = 0; y < img->height; y++) |
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396 | for(x = 0; x < img->width; x++) |
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397 | { |
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398 | getgray(img, x, y, &r); |
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399 | setpixel(dst, x, y, histo[r], histo[r], histo[r]); |
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400 | } |
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401 | |
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402 | return dst; |
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403 | } |
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404 | |
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405 | struct image *filter_crop(struct image *img, |
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406 | int xmin, int ymin, int xmax, int ymax) |
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407 | { |
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408 | struct image *dst; |
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409 | int x, y; |
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410 | int r, g, b; |
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411 | |
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412 | if(xmin < 0) |
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413 | xmin = 0; |
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414 | if(ymin < 0) |
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415 | ymin = 0; |
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416 | if(xmax >= img->width) |
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417 | xmax = img->width - 1; |
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418 | if(ymax >= img->height) |
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419 | ymax = img->height - 1; |
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420 | |
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421 | if(xmin >= xmax || ymin >= ymax) |
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422 | return NULL; |
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423 | |
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424 | dst = image_new(xmax - xmin, ymax - ymin); |
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425 | |
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426 | for(y = 0; y < dst->height; y++) |
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427 | for(x = 0; x < dst->width; x++) |
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428 | { |
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429 | getpixel(img, xmin + x, ymin + y, &r, &g, &b); |
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430 | setpixel(dst, x, y, r, g, b); |
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431 | } |
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432 | |
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433 | return dst; |
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434 | } |
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435 | |
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436 | int filter_count(struct image *img) |
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437 | { |
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438 | int histo[256]; |
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439 | int x, y, i, count = 0; |
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440 | int r, g, b; |
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441 | |
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442 | for(i = 0; i < 256; i++) |
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443 | histo[i] = 0; |
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444 | |
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445 | for(y = 0; y < img->height; y++) |
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446 | for(x = 0; x < img->width; x++) |
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447 | { |
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448 | getgray(img, x, y, &r); |
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449 | histo[r] = 1; |
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450 | } |
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451 | |
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452 | for(i = 0; i < 256; i++) |
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453 | count += histo[i]; |
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454 | |
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455 | return count; |
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456 | } |
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457 | |
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