1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4
5 /*
6 * This version of closest() is now (feb 20, 2001) installed as rgb2cmap in libdraw
7 */
8
9 int
closest(int cr,int cg,int cb)10 closest(int cr, int cg, int cb)
11 {
12 int i, r, g, b, sq;
13 ulong rgb;
14 int best, bestsq;
15
16 best = 0;
17 bestsq = 0x7FFFFFFF;
18 for(i=0; i<256; i++){
19 rgb = cmap2rgb(i);
20 r = (rgb>>16) & 0xFF;
21 g = (rgb>>8) & 0xFF;
22 b = (rgb>>0) & 0xFF;
23 sq = (r-cr)*(r-cr)+(g-cg)*(g-cg)+(b-cb)*(b-cb);
24 if(sq < bestsq){
25 bestsq = sq;
26 best = i;
27 }
28 }
29 return best;
30 }
31
32 void
main(int argc,char * argv[])33 main(int argc, char *argv[])
34 {
35 int i, rgb;
36 int r, g, b;
37 uchar close[16*16*16];
38
39 /* rgbmap */
40 print("uint rgbmap[256] = {\n");
41 for(i=0; i<256; i++){
42 if(i%8 == 0)
43 print("\t");
44 rgb = cmap2rgb(i);
45 r = (rgb>>16) & 0xFF;
46 g = (rgb>>8) & 0xFF;
47 b = (rgb>>0) & 0xFF;
48 print("0x%.6ulX, ", (r<<16) | (g<<8) | b);
49 if(i%8 == 7)
50 print("\n");
51 }
52 print("};\n\n");
53
54 /* closestrgb */
55 print("uchar closestrgb[16*16*16] = {\n");
56 for(r=0; r<256; r+=16)
57 for(g=0; g<256; g+=16)
58 for(b=0; b<256; b+=16)
59 close[(b/16)+16*((g/16)+16*(r/16))] = closest(r+8, g+8, b+8);
60 for(i=0; i<16*16*16; i++){
61 if(i%16 == 0)
62 print("\t");
63 print("%d,", close[i]);
64 if(i%16 == 15)
65 print("\n");
66 }
67 print("};\n\n");
68 exits(nil);
69 }
70