1 76193d7c 2003-09-30 devnull #include <u.h>
2 76193d7c 2003-09-30 devnull #include <libc.h>
3 76193d7c 2003-09-30 devnull #include <draw.h>
5 76193d7c 2003-09-30 devnull static char channames[] = "rgbkamx";
7 76193d7c 2003-09-30 devnull chantostr(char *buf, u32int cc)
9 76193d7c 2003-09-30 devnull u32int c, rc;
12 76193d7c 2003-09-30 devnull if(chantodepth(cc) == 0)
13 76193d7c 2003-09-30 devnull return nil;
15 76193d7c 2003-09-30 devnull /* reverse the channel descriptor so we can easily generate the string in the right order */
17 76193d7c 2003-09-30 devnull for(c=cc; c; c>>=8){
18 76193d7c 2003-09-30 devnull rc <<= 8;
19 76193d7c 2003-09-30 devnull rc |= c&0xFF;
23 76193d7c 2003-09-30 devnull for(c=rc; c; c>>=8) {
24 76193d7c 2003-09-30 devnull *p++ = channames[TYPE(c)];
25 76193d7c 2003-09-30 devnull *p++ = '0'+NBITS(c);
29 76193d7c 2003-09-30 devnull return buf;
33 76193d7c 2003-09-30 devnull strtochan(char *s)
35 76193d7c 2003-09-30 devnull char *p, *q;
36 76193d7c 2003-09-30 devnull u32int c;
37 76193d7c 2003-09-30 devnull int t, n;
41 76193d7c 2003-09-30 devnull while(*p && isspace(*p))
44 76193d7c 2003-09-30 devnull while(*p && !isspace(*p)){
45 76193d7c 2003-09-30 devnull if((q = strchr(channames, p[0])) == nil)
46 76193d7c 2003-09-30 devnull return 0;
47 76193d7c 2003-09-30 devnull t = q-channames;
48 76193d7c 2003-09-30 devnull if(p[1] < '0' || p[1] > '9')
49 76193d7c 2003-09-30 devnull return 0;
50 76193d7c 2003-09-30 devnull n = p[1]-'0';
51 76193d7c 2003-09-30 devnull c = (c<<8) | __DC(t, n);
54 76193d7c 2003-09-30 devnull return c;
58 76193d7c 2003-09-30 devnull chantodepth(u32int c)
62 76193d7c 2003-09-30 devnull for(n=0; c; c>>=8){
63 76193d7c 2003-09-30 devnull if(TYPE(c) >= NChan || NBITS(c) > 8 || NBITS(c) <= 0)
64 76193d7c 2003-09-30 devnull return 0;
65 76193d7c 2003-09-30 devnull n += NBITS(c);
67 76193d7c 2003-09-30 devnull if(n==0 || (n>8 && n%8) || (n<8 && 8%n))
68 76193d7c 2003-09-30 devnull return 0;
69 76193d7c 2003-09-30 devnull return n;