#define grid8_width 16
#define grid8_height 16
static char grid8_bits[] = {
   0xaa, 0xaa, 0xff, 0xff, 0xfe, 0xfe, 0xff, 0xff, 0xfe, 0xfe, 0xff, 0xff,
   0xfe, 0xfe, 0xff, 0xff, 0xaa, 0xaa, 0xff, 0xff, 0xfe, 0xfe, 0xff, 0xff,
   0xfe, 0xfe, 0xff, 0xff, 0xfe, 0xfe, 0xff, 0xff};