71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
#include <u.h>
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#include <lib9.h>
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#include <draw.h>
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/*
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* This version of closest() is now (feb 20, 2001) installed as rgb2cmap in libdraw
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*/
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int
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closest(int cr, int cg, int cb)
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{
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int i, r, g, b, sq;
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uint32_t rgb;
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int best, bestsq;
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best = 0;
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bestsq = 0x7FFFFFFF;
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for(i=0; i<256; i++){
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rgb = cmap2rgb(i);
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r = (rgb>>16) & 0xFF;
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g = (rgb>>8) & 0xFF;
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b = (rgb>>0) & 0xFF;
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sq = (r-cr)*(r-cr)+(g-cg)*(g-cg)+(b-cb)*(b-cb);
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if(sq < bestsq){
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bestsq = sq;
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best = i;
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}
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}
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return best;
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}
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void
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main(int argc, char *argv[])
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{
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int i, rgb;
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int r, g, b;
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unsigned char close[16*16*16];
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print("/* This file has been generated by rgbrgbv */\n");
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/* rgbmap */
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print("unsigned int rgbmap[256] = {\n");
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for(i=0; i<256; i++){
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if(i%8 == 0)
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print("\t");
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rgb = cmap2rgb(i);
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r = (rgb>>16) & 0xFF;
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g = (rgb>>8) & 0xFF;
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b = (rgb>>0) & 0xFF;
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print("0x%.6ulX, ", (r<<16) | (g<<8) | b);
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if(i%8 == 7)
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print("\n");
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}
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print("};\n\n");
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/* closestrgb */
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print("unsigned char closestrgb[16*16*16] = {\n");
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for(r=0; r<256; r+=16)
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for(g=0; g<256; g+=16)
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for(b=0; b<256; b+=16)
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close[(b/16)+16*((g/16)+16*(r/16))] = closest(r+8, g+8, b+8);
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for(i=0; i<16*16*16; i++){
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if(i%16 == 0)
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print("\t");
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print("%d,", close[i]);
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if(i%16 == 15)
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print("\n");
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}
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print("};\n\n");
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exits(nil);
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}
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