#define mark_width 16
#define mark_height 16
static char mark_bits[] = {
   0x00, 0x00, 0xfc, 0x3f, 0xfc, 0x3f, 0x00, 0x30, 0x00, 0x30, 0x00, 0x30,
   0x00, 0x30, 0x80, 0x3f, 0x80, 0x3f, 0x80, 0x01, 0x80, 0x01, 0x00, 0x00,
   0x00, 0x00, 0x80, 0x01, 0x80, 0x01, 0x00, 0x00};
