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>
 4 76193d7c 2003-09-30 devnull 
 5 76193d7c 2003-09-30 devnull static char channames[] = "rgbkamx";
 6 76193d7c 2003-09-30 devnull char*
 7 76193d7c 2003-09-30 devnull chantostr(char *buf, u32int cc)
 8 76193d7c 2003-09-30 devnull {
 9 76193d7c 2003-09-30 devnull 	u32int c, rc;
10 76193d7c 2003-09-30 devnull 	char *p;
11 76193d7c 2003-09-30 devnull 
12 76193d7c 2003-09-30 devnull 	if(chantodepth(cc) == 0)
13 76193d7c 2003-09-30 devnull 		return nil;
14 76193d7c 2003-09-30 devnull 
15 76193d7c 2003-09-30 devnull 	/* reverse the channel descriptor so we can easily generate the string in the right order */
16 76193d7c 2003-09-30 devnull 	rc = 0;
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;
20 76193d7c 2003-09-30 devnull 	}
21 76193d7c 2003-09-30 devnull 
22 76193d7c 2003-09-30 devnull 	p = buf;
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);
26 76193d7c 2003-09-30 devnull 	}
27 76193d7c 2003-09-30 devnull 	*p = 0;
28 76193d7c 2003-09-30 devnull 
29 76193d7c 2003-09-30 devnull 	return buf;
30 76193d7c 2003-09-30 devnull }
31 76193d7c 2003-09-30 devnull 
32 76193d7c 2003-09-30 devnull u32int
33 76193d7c 2003-09-30 devnull strtochan(char *s)
34 76193d7c 2003-09-30 devnull {
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;
38 76193d7c 2003-09-30 devnull 
39 76193d7c 2003-09-30 devnull 	c = 0;
40 76193d7c 2003-09-30 devnull 	p=s;
41 1c171e3a 2005-07-19 devnull 	while(*p && isspace((uchar)*p))
42 76193d7c 2003-09-30 devnull 		p++;
43 76193d7c 2003-09-30 devnull 
44 1c171e3a 2005-07-19 devnull 	while(*p && !isspace((uchar)*p)){
45 fa325e9b 2020-01-10 cross 		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);
52 76193d7c 2003-09-30 devnull 		p += 2;
53 76193d7c 2003-09-30 devnull 	}
54 76193d7c 2003-09-30 devnull 	return c;
55 76193d7c 2003-09-30 devnull }
56 76193d7c 2003-09-30 devnull 
57 76193d7c 2003-09-30 devnull int
58 76193d7c 2003-09-30 devnull chantodepth(u32int c)
59 76193d7c 2003-09-30 devnull {
60 76193d7c 2003-09-30 devnull 	int n;
61 76193d7c 2003-09-30 devnull 
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);
66 76193d7c 2003-09-30 devnull 	}
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;
70 76193d7c 2003-09-30 devnull }