#define boxes_width 16
#define boxes_height 16
static short boxes_bits[] = {
   0x0f0f, 0x0909, 0x0909, 0x0f0f,
   0xf0f0, 0x9090, 0x9090, 0xf0f0,
   0x0f0f, 0x0909, 0x0909, 0x0f0f,
   0xf0f0, 0x9090, 0x9090, 0xf0f0};