#define square_width 20
#define square_height 20
static unsigned char square_bits[] = {
   0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f,
   0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f,
   0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f,
   0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f,
   0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f, 0xff, 0xff, 0x0f};
