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
 6 76193d7c 2003-09-30 devnull int
 7 76193d7c 2003-09-30 devnull unitsperline(Rectangle r, int d, int bitsperunit)
 8 76193d7c 2003-09-30 devnull {
 9 76193d7c 2003-09-30 devnull 	ulong l, t;
10 76193d7c 2003-09-30 devnull 
11 76193d7c 2003-09-30 devnull 	if(d <= 0 || d > 32)	/* being called wrong.  d is image depth. */
12 76193d7c 2003-09-30 devnull 		abort();
13 76193d7c 2003-09-30 devnull 
14 76193d7c 2003-09-30 devnull 	if(r.min.x >= 0){
15 76193d7c 2003-09-30 devnull 		l = (r.max.x*d+bitsperunit-1)/bitsperunit;
16 76193d7c 2003-09-30 devnull 		l -= (r.min.x*d)/bitsperunit;
17 76193d7c 2003-09-30 devnull 	}else{			/* make positive before divide */
18 76193d7c 2003-09-30 devnull 		t = (-r.min.x*d+bitsperunit-1)/bitsperunit;
19 76193d7c 2003-09-30 devnull 		l = t+(r.max.x*d+bitsperunit-1)/bitsperunit;
20 76193d7c 2003-09-30 devnull 	}
21 76193d7c 2003-09-30 devnull 	return l;
22 76193d7c 2003-09-30 devnull }
23 76193d7c 2003-09-30 devnull 
24 76193d7c 2003-09-30 devnull int
25 76193d7c 2003-09-30 devnull wordsperline(Rectangle r, int d)
26 76193d7c 2003-09-30 devnull {
27 2634795b 2005-01-14 devnull 	return unitsperline(r, d, 8*sizeof(u32int));
28 76193d7c 2003-09-30 devnull }
29 76193d7c 2003-09-30 devnull 
30 76193d7c 2003-09-30 devnull int
31 76193d7c 2003-09-30 devnull bytesperline(Rectangle r, int d)
32 76193d7c 2003-09-30 devnull {
33 76193d7c 2003-09-30 devnull 	return unitsperline(r, d, 8);
34 76193d7c 2003-09-30 devnull }