SVGA_FORMAT_END_VAL
while (frm->bits_per_pixel != SVGA_FORMAT_END_VAL) {
#define SVGA_FORMAT_END {SVGA_FORMAT_END_VAL, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 0, 0, 0, 0, 0, 0}