1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 
5 /*
6  * This code (and the devdraw interface) will have to change
7  * if we ever get bitmaps with ldepth > 3, because the
8  * colormap will have to be written in chunks
9  */
10 
11 void
12 writecolmap(Display *d, RGB *m)
13 {
14 	int i, n, fd;
15 	char buf[64], *t;
16 	ulong r, g, b;
17 
18 	sprint(buf, "/dev/draw/%d/colormap", d->dirno);
19 	fd = open(buf, OWRITE);
20 	if(fd < 0)
21 		drawerror(d, "wrcolmap: open colormap failed");
22 	t = malloc(8192);
23 	n = 0;
24 	for(i = 0; i < 256; i++) {
25 		r = m[i].red>>24;
26 		g = m[i].green>>24;
27 		b = m[i].blue>>24;
28 		n += sprint(t+n, "%d %lud %lud %lud\n", 255-i, r, g, b);
29 	}
30 	i = write(fd, t, n);
31 	free(t);
32 	close(fd);
33 	if(i != n)
34 		drawerror(d, "wrcolmap: bad write");
35 }