Subversion Repositories planix.SVN

#include <u.h>

#include <libc.h>

#include <draw.h>

/*

 * This code (and the devdraw interface) will have to change

 * if we ever get bitmaps with ldepth > 3, because the

 * colormap will have to be written in chunks

 */

void

writecolmap(Display *d, RGB *m)

{

	int i, n, fd;

	char buf[64], *t;

	ulong r, g, b;

	sprint(buf, "/dev/draw/%d/colormap", d->dirno);

	fd = open(buf, OWRITE);

	if(fd < 0)

		drawerror(d, "writecolmap: open colormap failed");

	t = malloc(8192);

	if (t == nil)

		drawerror(d, "writecolmap: no memory");

	n = 0;

	for(i = 0; i < 256; i++) {

		r = m[i].red>>24;

		g = m[i].green>>24;

		b = m[i].blue>>24;

		n += sprint(t+n, "%d %lud %lud %lud\n", 255-i, r, g, b);

	}

	i = write(fd, t, n);

	free(t);

	close(fd);

	if(i != n)

		drawerror(d, "writecolmap: bad write");

}