#define grid_width 16
#define grid_height 16
static char grid_bits[] = {
0x02, 0x02, 
0xff, 0xff, 
0x02, 0x02, 
0x22, 0x22, 
0x02, 0x02, 
0xaa, 0xaa, 
0x02, 0x02, 
0x22, 0x22, 
0x02, 0x02, 
0xff, 0xff, 
0x02, 0x02, 
0x22, 0x22, 
0x02, 0x02, 
0xaa, 0xaa, 
0x02, 0x02, 
0x22, 0x22, 

};