1 | #include "stdio.h" |
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2 | #include "stdlib.h" |
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3 | #include "math.h" |
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4 | |
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5 | /* |
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6 | |
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7 | image converter based on http://paulbourke.net/dataformats/tga/ |
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8 | tga converter to various formats: |
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9 | |
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10 | here for thomson TO8/TO9 formats with specific gamma factor |
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11 | |
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12 | */ |
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13 | |
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14 | typedef struct { |
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15 | char idlength; |
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16 | char colourmaptype; |
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17 | char datatypecode; |
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18 | short int colourmaporigin; |
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19 | short int colourmaplength; |
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20 | char colourmapdepth; |
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21 | short int x_origin; |
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22 | short int y_origin; |
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23 | short width; |
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24 | short height; |
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25 | char bitsperpixel; |
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26 | char imagedescriptor; |
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27 | } HEADER; |
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28 | |
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29 | typedef struct { |
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30 | unsigned char r,g,b,a; |
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31 | } PIXEL; |
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32 | |
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33 | void MergeBytes(PIXEL *,unsigned char *,int); |
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34 | |
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35 | int main(int argc,char **argv) |
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36 | { |
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37 | int n=0,i,j; |
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38 | int bytes2read,skipover = 0; |
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39 | unsigned char p[5]; |
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40 | FILE *fptr; |
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41 | HEADER header; |
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42 | PIXEL *pixels; |
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43 | |
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44 | if (argc < 2) { |
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45 | fprintf(stderr,"Usage: %s tgafile\n",argv[0]); |
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46 | exit(-1); |
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47 | } |
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48 | |
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49 | /* Open the file */ |
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50 | if ((fptr = fopen(argv[1],"r")) == NULL) { |
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51 | fprintf(stderr,"File open failed\n"); |
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52 | exit(-1); |
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53 | } |
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54 | |
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55 | /* Display the header fields */ |
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56 | header.idlength = fgetc(fptr); |
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57 | fprintf(stderr,"ID length: %d\n",header.idlength); |
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58 | header.colourmaptype = fgetc(fptr); |
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59 | fprintf(stderr,"Colourmap type: %d\n",header.colourmaptype); |
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60 | header.datatypecode = fgetc(fptr); |
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61 | fprintf(stderr,"Image type: %d\n",header.datatypecode); |
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62 | fread(&header.colourmaporigin,2,1,fptr); |
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63 | fprintf(stderr,"Colour map offset: %d\n",header.colourmaporigin); |
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64 | fread(&header.colourmaplength,2,1,fptr); |
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65 | fprintf(stderr,"Colour map length: %d\n",header.colourmaplength); |
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66 | header.colourmapdepth = fgetc(fptr); |
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67 | fprintf(stderr,"Colour map depth: %d\n",header.colourmapdepth); |
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68 | fread(&header.x_origin,2,1,fptr); |
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69 | fprintf(stderr,"X origin: %d\n",header.x_origin); |
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70 | fread(&header.y_origin,2,1,fptr); |
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71 | fprintf(stderr,"Y origin: %d\n",header.y_origin); |
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72 | fread(&header.width,2,1,fptr); |
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73 | fprintf(stderr,"Width: %d\n",header.width); |
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74 | fread(&header.height,2,1,fptr); |
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75 | fprintf(stderr,"Height: %d\n",header.height); |
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76 | header.bitsperpixel = fgetc(fptr); |
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77 | fprintf(stderr,"Bits per pixel: %d\n",header.bitsperpixel); |
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78 | header.imagedescriptor = fgetc(fptr); |
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79 | fprintf(stderr,"Descriptor: %d\n",header.imagedescriptor); |
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80 | |
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81 | /* Allocate space for the image */ |
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82 | if ((pixels = malloc(header.width*header.height*sizeof(PIXEL))) == NULL) { |
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83 | fprintf(stderr,"malloc of image failed\n"); |
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84 | exit(-1); |
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85 | } |
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86 | for (i=0;i<header.width*header.height;i++) { |
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87 | pixels[i].r = 0; |
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88 | pixels[i].g = 0; |
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89 | pixels[i].b = 0; |
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90 | pixels[i].a = 0; |
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91 | } |
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92 | |
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93 | /* What can we handle */ |
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94 | if (header.datatypecode != 2 && header.datatypecode != 10) { |
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95 | fprintf(stderr,"Can only handle image type 2 and 10\n"); |
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96 | exit(-1); |
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97 | } |
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98 | if (header.bitsperpixel != 16 && |
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99 | header.bitsperpixel != 24 && header.bitsperpixel != 32) { |
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100 | fprintf(stderr,"Can only handle pixel depths of 16, 24, and 32\n"); |
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101 | exit(-1); |
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102 | } |
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103 | if (header.colourmaptype != 0 && header.colourmaptype != 1) { |
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104 | fprintf(stderr,"Can only handle colour map types of 0 and 1\n"); |
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105 | exit(-1); |
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106 | } |
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107 | |
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108 | /* Skip over unnecessary stuff */ |
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109 | skipover += header.idlength; |
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110 | skipover += header.colourmaptype * header.colourmaplength; |
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111 | fprintf(stderr,"Skip over %d bytes\n",skipover); |
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112 | fseek(fptr,skipover,SEEK_CUR); |
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113 | |
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114 | /* Read the image */ |
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115 | bytes2read = header.bitsperpixel / 8; |
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116 | while (n < header.width * header.height) { |
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117 | if (header.datatypecode == 2) { /* Uncompressed */ |
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118 | if (fread(p,1,bytes2read,fptr) != bytes2read) { |
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119 | fprintf(stderr,"Unexpected end of file at pixel %d\n",i); |
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120 | exit(-1); |
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121 | } |
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122 | MergeBytes(&(pixels[n]),p,bytes2read); |
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123 | n++; |
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124 | } else if (header.datatypecode == 10) { /* Compressed */ |
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125 | if (fread(p,1,bytes2read+1,fptr) != bytes2read+1) { |
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126 | fprintf(stderr,"Unexpected end of file at pixel %d\n",i); |
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127 | exit(-1); |
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128 | } |
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129 | j = p[0] & 0x7f; |
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130 | MergeBytes(&(pixels[n]),&(p[1]),bytes2read); |
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131 | n++; |
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132 | if (p[0] & 0x80) { /* RLE chunk */ |
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133 | for (i=0;i<j;i++) { |
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134 | MergeBytes(&(pixels[n]),&(p[1]),bytes2read); |
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135 | n++; |
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136 | } |
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137 | } else { /* Normal chunk */ |
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138 | for (i=0;i<j;i++) { |
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139 | if (fread(p,1,bytes2read,fptr) != bytes2read) { |
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140 | fprintf(stderr,"Unexpected end of file at pixel %d\n",i); |
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141 | exit(-1); |
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142 | } |
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143 | MergeBytes(&(pixels[n]),p,bytes2read); |
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144 | n++; |
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145 | } |
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146 | } |
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147 | } |
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148 | } |
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149 | fclose(fptr); |
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150 | |
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151 | fprintf(stderr,"[INFO] now in vm part ;) \n"); |
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152 | /* now count colors used */ |
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153 | int palette_24b[256]; |
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154 | int palette_to[16]; |
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155 | int col_num=1; |
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156 | int val; |
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157 | palette_24b[0]=(pixels[0].b<<16)|(pixels[0].g<<8)|(pixels[0].r); |
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158 | for (i=1;i<header.height*header.width;i++) { |
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159 | val=(pixels[i].b<<16)|(pixels[i].g<<8)|(pixels[i].r); |
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160 | // does this color exists in palette |
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161 | for (j=0;j<col_num;j++) { |
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162 | if (palette_24b[j]==val) break; |
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163 | } |
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164 | if (j==col_num) { |
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165 | if (col_num==255) { |
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166 | col_num=256; |
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167 | fprintf(stderr,"[ERROR] too many colors (+256) !!!\n"); |
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168 | exit(-1); |
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169 | } |
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170 | palette_24b[col_num]=val; |
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171 | col_num++; |
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172 | } |
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173 | } |
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174 | fprintf(stderr,"[INFO] Number of unique colors %d\n",col_num); |
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175 | |
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176 | if (col_num>16) { |
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177 | fprintf(stderr,"[ERROR] too many colors %d\n",col_num); |
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178 | exit(-1); |
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179 | } |
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180 | |
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181 | |
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182 | for (i=0;i<16;i++) palette_to[i]=0; |
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183 | |
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184 | |
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185 | for (i=0;i<col_num;i++) { |
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186 | palette_to[i]=pal_conv((palette_24b[i]&0xFF0000)>>16)<<8; |
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187 | palette_to[i]|=pal_conv((palette_24b[i]&0xFF00)>>8)<<4; |
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188 | palette_to[i]|=pal_conv((palette_24b[i]&0xFF)); |
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189 | fprintf(stderr,"[INFO] palette[%d]=%03x\n",i,palette_to[i]); |
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190 | } |
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191 | |
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192 | |
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193 | /* ouput in 2 files raw data 8kb each (palette at end) */ |
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194 | FILE *COL; |
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195 | FILE *PT; |
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196 | |
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197 | COL=fopen("COL.BIN","wb"); |
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198 | PT=fopen("PT.BIN","wb"); |
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199 | |
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200 | // on modifie les pixels 2 par 2 |
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201 | for (i=0;i<header.height*header.width;i++) { |
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202 | int mem; |
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203 | val=(pixels[i].b<<16)|(pixels[i].g<<8)|(pixels[i].r); |
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204 | // on retrouve l'index dans la palette dans j |
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205 | for (j=0;j<16;j++) { |
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206 | if (val==palette_24b[j]) break; |
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207 | } |
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208 | switch (i%4) { |
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209 | case 0 : mem=j<<4; |
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210 | break; |
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211 | case 1 : fputc(mem|j,PT); |
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212 | break; |
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213 | case 2 : mem=j<<4; |
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214 | break; |
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215 | case 3 : fputc(mem|j,COL); |
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216 | break; |
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217 | } |
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218 | } |
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219 | for (i=0;i<16;i++) { |
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220 | fputc((palette_to[i]&0xFF00)>>8,PT); |
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221 | fputc((palette_to[i]&0xFF),PT); |
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222 | fputc((palette_to[i]&0xFF00)>>8,COL); |
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223 | fputc((palette_to[i]&0xFF),COL); |
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224 | } |
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225 | |
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226 | fclose(PT); |
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227 | fclose(COL); |
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228 | } |
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229 | |
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230 | int |
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231 | pal_conv(int v) { |
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232 | int i; |
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233 | /* convert palette to thomson gamma factor */ |
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234 | // static int gamma[16]={0,100,127,147,163,179,191,203,215,223,231,239,243,247,251,255}; |
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235 | static int seuils[17]={0,50,114,137,155,171,185,197,209,219,227,235,241,245,249,253,257}; |
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236 | for (i=0;i<16;i++) { |
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237 | if (v<seuils[i+1]) break; |
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238 | } |
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239 | return i; |
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240 | } |
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241 | |
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242 | void |
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243 | output_tga(HEADER header,PIXEL *pixels) { |
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244 | FILE *fptr; |
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245 | int i; |
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246 | /* Write the result as a uncompressed TGA */ |
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247 | if ((fptr = fopen("tgatest.tga","w")) == NULL) { |
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248 | fprintf(stderr,"Failed to open outputfile\n"); |
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249 | exit(-1); |
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250 | } |
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251 | putc(0,fptr); |
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252 | putc(0,fptr); |
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253 | putc(2,fptr); /* uncompressed RGB */ |
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254 | putc(0,fptr); putc(0,fptr); |
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255 | putc(0,fptr); putc(0,fptr); |
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256 | putc(0,fptr); |
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257 | putc(0,fptr); putc(0,fptr); /* X origin */ |
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258 | putc(0,fptr); putc(0,fptr); /* y origin */ |
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259 | putc((header.width & 0x00FF),fptr); |
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260 | putc((header.width & 0xFF00) / 256,fptr); |
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261 | putc((header.height & 0x00FF),fptr); |
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262 | putc((header.height & 0xFF00) / 256,fptr); |
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263 | putc(32,fptr); /* 24 bit bitmap */ |
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264 | putc(0,fptr); |
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265 | for (i=0;i<header.height*header.width;i++) { |
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266 | putc(pixels[i].b,fptr); |
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267 | putc(pixels[i].g,fptr); |
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268 | putc(pixels[i].r,fptr); |
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269 | putc(pixels[i].a,fptr); |
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270 | } |
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271 | fclose(fptr); |
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272 | } |
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273 | |
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274 | void MergeBytes(PIXEL *pixel,unsigned char *p,int bytes) |
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275 | { |
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276 | if (bytes == 4) { |
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277 | pixel->r = p[2]; |
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278 | pixel->g = p[1]; |
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279 | pixel->b = p[0]; |
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280 | pixel->a = p[3]; |
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281 | } else if (bytes == 3) { |
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282 | pixel->r = p[2]; |
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283 | pixel->g = p[1]; |
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284 | pixel->b = p[0]; |
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285 | pixel->a = 0; |
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286 | } else if (bytes == 2) { |
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287 | pixel->r = (p[1] & 0x7c) << 1; |
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288 | pixel->g = ((p[1] & 0x03) << 6) | ((p[0] & 0xe0) >> 2); |
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289 | pixel->b = (p[0] & 0x1f) << 3; |
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290 | pixel->a = (p[1] & 0x80); |
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291 | } |
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292 | } |
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293 | |
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