code: public SparseBitmap or(SparseBitmap o) {
  		SparseBitmap a = new SparseBitmap();
  		or2by2(a, this, o);
  		return a;
  	}
docs: Computes the bit-wise logical or with another bitmap.
  
  @param o
  another bitmap
  @return the result of the bit-wise logical or