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 } 36