Then, as I said, it's a matter of checking the location and the shape of the tetromino and making sure the memory is "free" (the value is 0) for the entire height and width of the shape for the offset x and y.
Then, as I said, it's a matter of checking the location and the shape of the tetromino and making sure the memory is "free" (the value is 0) for the entire height and width of the shape for the offset x and y.