#define circle_width 16
#define circle_height 16
static unsigned char circle_bits[] = {
   0xe0, 0x07, 0x90, 0x08, 0x0c, 0x31, 0x82, 0x40, 0x02, 0x41, 0x81, 0x80,
   0x01, 0x81, 0x81, 0x81, 0x81, 0x81, 0x01, 0x80, 0x01, 0x80, 0x02, 0x40,
   0x02, 0x40, 0x0c, 0x30, 0x10, 0x08, 0xe0, 0x07};