#define bullet_width 10
#define bullet_height 10
static unsigned char bullet_bits[] = {
   0x04, 0x00, 0x08, 0x00, 0x10, 0x00, 0x20, 0x00, 0x40, 0x00, 0x20, 0x00,
   0x10, 0x00, 0x08, 0x00, 0x04, 0x00, 0x00, 0x00 };