| #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"); |
| } |
