#define grid4_width 16
#define grid4_height 16
static char grid4_bits[] = {
   0xaa, 0xaa, 0xff, 0xff, 0xee, 0xee, 0xff, 0xff, 0xaa, 0xaa, 0xff, 0xff,
   0xee, 0xee, 0xff, 0xff, 0xaa, 0xaa, 0xff, 0xff, 0xee, 0xee, 0xff, 0xff,
   0xaa, 0xaa, 0xff, 0xff, 0xee, 0xee, 0xff, 0xff};