code: public void setup(int width, int height, ScanCallback callback)
  	{
  		width_ = width; height_ = height;
  		ySortedEdges_ = null;
  		activeEdgesTable_ = null;
  		numEdges_ = 0;
  		callback_ = callback;
  		if (scanBuffer_ == null)
  			scanBuffer_ = new int[128 * 3];
  		
  		startAddingEdges();
  	}
docs: Sets up the rasterizer.