#define bullet_width 8
#define bullet_height 16
static unsigned char bullet_bits[] = {
   0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff, 0xff, 0x7f, 0x3f, 0x1f,
   0x0f, 0x07, 0x03, 0x01 };