#define stone_width 16
#define stone_height 16
#define stone_x_hot -1
#define stone_y_hot -1
static char stone_bits[] = {
   0x1f, 0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x7f,
   0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xfe, 0x7f, 0xff, 0xff,
   0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xf8};