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");
}