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