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WebSVN – planix.SVN – Blame – /os/branches/feature_fixcpp/sys/src/cmd/jpg/close.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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float c1 = 1.402;
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float c2 = 0.34414;
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float c3 = 0.71414;
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float c4 = 1.772;
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int
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closest(int Y, int Cb, int Cr)
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{
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	double r, g, b;
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	double diff, min;
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	int rgb, R, G, B, v, i;
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	int y1, cb1, cr1;
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	Cb -= 128;
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	Cr -= 128;
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	r = Y+c1*Cr;
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	g = Y-c2*Cb-c3*Cr;
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	b = Y+c4*Cb;
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//print("YCbCr: %d %d %d, RGB: %g %g %g\n", Y, Cb, Cr, r, g, b);
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	min = 1000000.;
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	v = 1000;
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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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		diff = (R-r)*(R-r) + (G-g)*(G-g) + (B-b)*(B-b);
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//		y1 = 0.5870*G + 0.114*B + 0.299*R;
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//		cb1 = (B-y1)/1.772;
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//		cr1 = (R-y1)/1.402;
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		if(diff < min){
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//			if(Y==0 && y1!=0)
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//				continue;
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//			if(Y==256-16 && y1<256-16)
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//				continue;
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//			if(Cb==0 && cb1!=0)
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//				continue;
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//			if(Cb==256-16 && cb1<256-16)
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//				continue;
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//			if(Cr==0 && cr1!=0)
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//				continue;
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//			if(Cr==256-16 && cr1<256-16)
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//				continue;
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//print("%d %d %d\n", R, G, B);
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			min = diff;
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			v = i;
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		}
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	}
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	if(v > 255)
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		abort();
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	return v;
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}
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#define 	SHIFT	5
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#define	INC		(1<<SHIFT)
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typedef struct Color Color;
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struct Color
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{
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	int		col;
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	Color	*next;
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};
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Color	*col[INC*INC*INC];
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void
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add(int c, int y, int cb, int cr)
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{
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	Color *cp;
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	y >>= 8-SHIFT;
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	cb >>= 8-SHIFT;
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	cr >>= 8-SHIFT;
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	cp = col[cr+INC*(cb+INC*y)];
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	while(cp != nil){
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		if(cp->col == c)
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			return;
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		cp = cp->next;
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	}
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	cp = malloc(sizeof(Color));
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	cp->col = c;
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	cp->next = col[cr+INC*(cb+INC*y)];
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	col[cr+INC*(cb+INC*y)] = cp;
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}
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void
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main(void)
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{
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	int y, cb, cr, n;
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	Color *cp;
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	for(y=0; y<256; y++){
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		for(cb=0; cb<256; cb++)
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			for(cr=0;cr<256;cr++)
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				add(closest(y, cb, cr), y, cb, cr);
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		fprint(2, "%d done\n", y);
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	}
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	for(y=0; y<INC*INC*INC; y++){
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		n = 0;
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		cp = col[y];
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		while(cp != nil){
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			n++;
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			cp = cp->next;
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		}
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		cp = col[y];
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		while(cp != nil){
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			n++;
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			print("%d ", cp->col);
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			cp = cp->next;
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		}
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		print("\n");
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	}
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}