set method
Sets the given bit to true.
@param x The horizontal component (i.e. which column) @param y The vertical component (i.e. which row)
Implementation
void set(int x, int y) {
final offset = y * _rowSize + (x ~/ 32);
_bits[offset] |= (1 << (x & 0x1f) & 0xFFFFFFFF);
}