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WebSVN – planix.SVN – Blame – /os/branches/feature-vt/sys/src/cmd/jpg/rgbrgbv.c – Rev 2

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#include <u.h>
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#include <libc.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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	ulong 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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	uchar close[16*16*16];
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	/* rgbmap */
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	print("uint 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("uchar 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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}