#define grid_diag4_width 16
#define grid_diag4_height 16
static char grid_diag4_bits[] = {
   0xbb, 0xbb, 0x55, 0x55, 0xee, 0xee, 0x55, 0x55, 0xbb, 0xbb, 0x55, 0x55,
   0xee, 0xee, 0x55, 0x55, 0xbb, 0xbb, 0x55, 0x55, 0xee, 0xee, 0x55, 0x55,
   0xbb, 0xbb, 0x55, 0x55, 0xee, 0xee, 0x55, 0x55};