#define signal_mask_width 16
#define signal_mask_height 16
static unsigned char signal_mask_bits[] = {
   0x70, 0x00, 0xf8, 0x00, 0xf8, 0x00, 0xfc, 0x01, 0xfc, 0x01, 0xfc, 0x71,
   0xfe, 0xfb, 0xdf, 0xfb, 0xdf, 0xff, 0x8f, 0x3f, 0x80, 0x3f, 0x00, 0x1f,
   0x00, 0x1f, 0x00, 0x1e, 0x00, 0x0e, 0x00, 0x04};
