1 28994509 2004-04-21 devnull #include <u.h>
 2 28994509 2004-04-21 devnull #include <libc.h>
 3 28994509 2004-04-21 devnull #include <draw.h>
 4 28994509 2004-04-21 devnull 
 5 28994509 2004-04-21 devnull /*
 6 28994509 2004-04-21 devnull  * This version of closest() is now (feb 20, 2001) installed as rgb2cmap in libdraw
 7 28994509 2004-04-21 devnull  */
 8 28994509 2004-04-21 devnull 
 9 28994509 2004-04-21 devnull int
10 28994509 2004-04-21 devnull closest(int cr, int cg, int cb)
11 28994509 2004-04-21 devnull {
12 28994509 2004-04-21 devnull 	int i, r, g, b, sq;
13 28994509 2004-04-21 devnull 	ulong rgb;
14 28994509 2004-04-21 devnull 	int best, bestsq;
15 28994509 2004-04-21 devnull 
16 28994509 2004-04-21 devnull 	best = 0;
17 28994509 2004-04-21 devnull 	bestsq = 0x7FFFFFFF;
18 28994509 2004-04-21 devnull 	for(i=0; i<256; i++){
19 28994509 2004-04-21 devnull 		rgb = cmap2rgb(i);
20 28994509 2004-04-21 devnull 		r = (rgb>>16) & 0xFF;
21 28994509 2004-04-21 devnull 		g = (rgb>>8) & 0xFF;
22 28994509 2004-04-21 devnull 		b = (rgb>>0) & 0xFF;
23 28994509 2004-04-21 devnull 		sq = (r-cr)*(r-cr)+(g-cg)*(g-cg)+(b-cb)*(b-cb);
24 28994509 2004-04-21 devnull 		if(sq < bestsq){
25 28994509 2004-04-21 devnull 			bestsq = sq;
26 28994509 2004-04-21 devnull 			best = i;
27 28994509 2004-04-21 devnull 		}
28 28994509 2004-04-21 devnull 	}
29 28994509 2004-04-21 devnull 	return best;
30 28994509 2004-04-21 devnull }
31 28994509 2004-04-21 devnull 
32 28994509 2004-04-21 devnull void
33 28994509 2004-04-21 devnull main(int argc, char *argv[])
34 28994509 2004-04-21 devnull {
35 28994509 2004-04-21 devnull 	int i, rgb;
36 28994509 2004-04-21 devnull 	int r, g, b;
37 28994509 2004-04-21 devnull 	uchar close[16*16*16];
38 28994509 2004-04-21 devnull 
39 28994509 2004-04-21 devnull 	/* rgbmap */
40 28994509 2004-04-21 devnull 	print("uint rgbmap[256] = {\n");
41 28994509 2004-04-21 devnull 	for(i=0; i<256; i++){
42 28994509 2004-04-21 devnull 		if(i%8 == 0)
43 28994509 2004-04-21 devnull 			print("\t");
44 28994509 2004-04-21 devnull 		rgb = cmap2rgb(i);
45 28994509 2004-04-21 devnull 		r = (rgb>>16) & 0xFF;
46 28994509 2004-04-21 devnull 		g = (rgb>>8) & 0xFF;
47 28994509 2004-04-21 devnull 		b = (rgb>>0) & 0xFF;
48 28994509 2004-04-21 devnull 		print("0x%.6ulX, ", (r<<16) | (g<<8) | b);
49 28994509 2004-04-21 devnull 		if(i%8 == 7)
50 28994509 2004-04-21 devnull 			print("\n");
51 28994509 2004-04-21 devnull 	}
52 28994509 2004-04-21 devnull 	print("};\n\n");
53 28994509 2004-04-21 devnull 
54 28994509 2004-04-21 devnull 	/* closestrgb */
55 28994509 2004-04-21 devnull 	print("uchar closestrgb[16*16*16] = {\n");
56 28994509 2004-04-21 devnull 	for(r=0; r<256; r+=16)
57 28994509 2004-04-21 devnull 	for(g=0; g<256; g+=16)
58 28994509 2004-04-21 devnull 	for(b=0; b<256; b+=16)
59 28994509 2004-04-21 devnull 		close[(b/16)+16*((g/16)+16*(r/16))] = closest(r+8, g+8, b+8);
60 28994509 2004-04-21 devnull 	for(i=0; i<16*16*16; i++){
61 28994509 2004-04-21 devnull 		if(i%16 == 0)
62 28994509 2004-04-21 devnull 			print("\t");
63 28994509 2004-04-21 devnull 		print("%d,", close[i]);
64 28994509 2004-04-21 devnull 		if(i%16 == 15)
65 28994509 2004-04-21 devnull 			print("\n");
66 28994509 2004-04-21 devnull 	}
67 28994509 2004-04-21 devnull 	print("};\n\n");
68 28994509 2004-04-21 devnull 	exits(nil);
69 28994509 2004-04-21 devnull }