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- #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, "wrcolmap: open colormap failed");
- t = malloc(8192);
- 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, "wrcolmap: bad write");
- }
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