1 | /* |
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2 | * libpipi Pathetic image processing interface library |
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3 | * Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id$ |
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7 | * |
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8 | * This library 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 | /* |
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16 | * mulscreen.c: multiply and screen computation functions |
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17 | */ |
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18 | |
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19 | #include "config.h" |
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20 | #include "common.h" |
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21 | |
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22 | #include "pipi.h" |
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23 | #include "pipi_internals.h" |
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24 | |
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25 | pipi_image_t *pipi_multiply(pipi_image_t *img1, pipi_image_t *img2) |
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26 | { |
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27 | pipi_image_t *dst; |
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28 | pipi_pixels_t *img1p, *img2p, *dstp; |
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29 | float *img1data, *img2data, *dstdata; |
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30 | int x, y, w, h; |
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31 | |
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32 | if(img1->w != img2->w || img1->h != img2->h) |
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33 | return NULL; |
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34 | |
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35 | w = img1->w; |
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36 | h = img1->h; |
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37 | |
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38 | dst = pipi_new(w, h); |
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39 | dstp = pipi_getpixels(dst, PIPI_PIXELS_RGBA_F); |
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40 | dstdata = (float *)dstp->pixels; |
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41 | |
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42 | img1p = pipi_getpixels(img1, PIPI_PIXELS_RGBA_F); |
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43 | img1data = (float *)img1p->pixels; |
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44 | img2p = pipi_getpixels(img2, PIPI_PIXELS_RGBA_F); |
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45 | img2data = (float *)img2p->pixels; |
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46 | |
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47 | for(y = 0; y < h; y++) |
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48 | { |
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49 | for(x = 0; x < w; x++) |
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50 | { |
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51 | float p, q; |
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52 | |
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53 | p = img1data[4 * (y * w + x)]; |
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54 | q = img2data[4 * (y * w + x)]; |
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55 | dstdata[4 * (y * w + x)] = p * q; |
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56 | |
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57 | p = img1data[4 * (y * w + x) + 1]; |
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58 | q = img2data[4 * (y * w + x) + 1]; |
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59 | dstdata[4 * (y * w + x) + 1] = p * q; |
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60 | |
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61 | p = img1data[4 * (y * w + x) + 2]; |
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62 | q = img2data[4 * (y * w + x) + 2]; |
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63 | dstdata[4 * (y * w + x) + 2] = p * q; |
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64 | |
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65 | p = img1data[4 * (y * w + x) + 3]; |
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66 | q = img2data[4 * (y * w + x) + 3]; |
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67 | dstdata[4 * (y * w + x) + 3] = p * q; |
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68 | } |
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69 | } |
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70 | |
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71 | return dst; |
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72 | } |
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73 | |
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74 | pipi_image_t *pipi_divide(pipi_image_t *img1, pipi_image_t *img2) |
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75 | { |
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76 | pipi_image_t *dst; |
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77 | pipi_pixels_t *img1p, *img2p, *dstp; |
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78 | float *img1data, *img2data, *dstdata; |
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79 | int x, y, w, h; |
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80 | |
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81 | if(img1->w != img2->w || img1->h != img2->h) |
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82 | return NULL; |
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83 | |
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84 | w = img1->w; |
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85 | h = img1->h; |
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86 | |
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87 | dst = pipi_new(w, h); |
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88 | dstp = pipi_getpixels(dst, PIPI_PIXELS_RGBA_F); |
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89 | dstdata = (float *)dstp->pixels; |
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90 | |
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91 | img1p = pipi_getpixels(img1, PIPI_PIXELS_RGBA_F); |
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92 | img1data = (float *)img1p->pixels; |
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93 | img2p = pipi_getpixels(img2, PIPI_PIXELS_RGBA_F); |
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94 | img2data = (float *)img2p->pixels; |
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95 | |
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96 | for(y = 0; y < h; y++) |
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97 | { |
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98 | for(x = 0; x < w; x++) |
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99 | { |
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100 | float p, q; |
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101 | |
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102 | p = img1data[4 * (y * w + x)]; |
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103 | q = img2data[4 * (y * w + x)]; |
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104 | dstdata[4 * (y * w + x)] = p >= q ? 1. : p / q; |
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105 | |
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106 | p = img1data[4 * (y * w + x) + 1]; |
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107 | q = img2data[4 * (y * w + x) + 1]; |
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108 | dstdata[4 * (y * w + x) + 1] = p >= q ? 1. : p / q; |
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109 | |
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110 | p = img1data[4 * (y * w + x) + 2]; |
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111 | q = img2data[4 * (y * w + x) + 2]; |
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112 | dstdata[4 * (y * w + x) + 2] = p >= q ? 1. : p / q; |
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113 | |
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114 | p = img1data[4 * (y * w + x) + 3]; |
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115 | q = img2data[4 * (y * w + x) + 3]; |
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116 | dstdata[4 * (y * w + x) + 3] = p >= q ? 1. : p / q; |
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117 | } |
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118 | } |
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119 | |
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120 | return dst; |
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121 | } |
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122 | |
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123 | pipi_image_t *pipi_screen(pipi_image_t *img1, pipi_image_t *img2) |
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124 | { |
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125 | pipi_image_t *dst; |
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126 | pipi_pixels_t *img1p, *img2p, *dstp; |
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127 | float *img1data, *img2data, *dstdata; |
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128 | int x, y, w, h; |
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129 | |
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130 | if(img1->w != img2->w || img1->h != img2->h) |
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131 | return NULL; |
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132 | |
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133 | w = img1->w; |
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134 | h = img1->h; |
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135 | |
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136 | dst = pipi_new(w, h); |
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137 | dstp = pipi_getpixels(dst, PIPI_PIXELS_RGBA_F); |
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138 | dstdata = (float *)dstp->pixels; |
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139 | |
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140 | img1p = pipi_getpixels(img1, PIPI_PIXELS_RGBA_F); |
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141 | img1data = (float *)img1p->pixels; |
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142 | img2p = pipi_getpixels(img2, PIPI_PIXELS_RGBA_F); |
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143 | img2data = (float *)img2p->pixels; |
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144 | |
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145 | for(y = 0; y < h; y++) |
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146 | { |
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147 | for(x = 0; x < w; x++) |
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148 | { |
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149 | float p, q; |
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150 | |
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151 | p = img1data[4 * (y * w + x)]; |
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152 | q = img2data[4 * (y * w + x)]; |
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153 | dstdata[4 * (y * w + x)] = p + q - p * q; |
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154 | |
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155 | p = img1data[4 * (y * w + x) + 1]; |
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156 | q = img2data[4 * (y * w + x) + 1]; |
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157 | dstdata[4 * (y * w + x) + 1] = p + q - p * q; |
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158 | |
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159 | p = img1data[4 * (y * w + x) + 2]; |
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160 | q = img2data[4 * (y * w + x) + 2]; |
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161 | dstdata[4 * (y * w + x) + 2] = p + q - p * q; |
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162 | |
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163 | p = img1data[4 * (y * w + x) + 3]; |
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164 | q = img2data[4 * (y * w + x) + 3]; |
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165 | dstdata[4 * (y * w + x) + 3] = p + q - p * q; |
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166 | } |
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167 | } |
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168 | |
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169 | return dst; |
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170 | } |
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171 | |
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172 | pipi_image_t *pipi_overlay(pipi_image_t *img1, pipi_image_t *img2) |
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173 | { |
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174 | pipi_image_t *dst; |
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175 | pipi_pixels_t *img1p, *img2p, *dstp; |
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176 | float *img1data, *img2data, *dstdata; |
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177 | int x, y, w, h; |
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178 | |
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179 | if(img1->w != img2->w || img1->h != img2->h) |
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180 | return NULL; |
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181 | |
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182 | w = img1->w; |
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183 | h = img1->h; |
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184 | |
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185 | dst = pipi_new(w, h); |
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186 | dstp = pipi_getpixels(dst, PIPI_PIXELS_RGBA_F); |
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187 | dstdata = (float *)dstp->pixels; |
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188 | |
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189 | img1p = pipi_getpixels(img1, PIPI_PIXELS_RGBA_F); |
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190 | img1data = (float *)img1p->pixels; |
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191 | img2p = pipi_getpixels(img2, PIPI_PIXELS_RGBA_F); |
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192 | img2data = (float *)img2p->pixels; |
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193 | |
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194 | for(y = 0; y < h; y++) |
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195 | { |
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196 | for(x = 0; x < w; x++) |
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197 | { |
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198 | float p, q; |
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199 | |
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200 | p = img1data[4 * (y * w + x)]; |
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201 | q = img2data[4 * (y * w + x)]; |
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202 | dstdata[4 * (y * w + x)] = p * (p + 2. * q * (1. - p)); |
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203 | |
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204 | p = img1data[4 * (y * w + x) + 1]; |
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205 | q = img2data[4 * (y * w + x) + 1]; |
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206 | dstdata[4 * (y * w + x) + 1] = p * (p + 2. * q * (1. - p)); |
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207 | |
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208 | p = img1data[4 * (y * w + x) + 2]; |
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209 | q = img2data[4 * (y * w + x) + 2]; |
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210 | dstdata[4 * (y * w + x) + 2] = p * (p + 2. * q * (1. - p)); |
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211 | |
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212 | p = img1data[4 * (y * w + x) + 3]; |
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213 | q = img2data[4 * (y * w + x) + 3]; |
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214 | dstdata[4 * (y * w + x) + 3] = p * (p + 2. * q * (1. - p)); |
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215 | } |
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216 | } |
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217 | |
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218 | return dst; |
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219 | } |
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220 | |
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