code: private ImageScale scaleImage(int imageX, int imageY, int containerX, int containerY) {
  		ImageScale ret = new ImageScale();
  		// Compare aspects faster by multiplying out the divisors.
  		if (imageX * containerY > imageY * containerX) {
  			// Image aspect wider than container
  			ret.scale = (float) containerX / imageX;
  			ret.deltaY = ((float) containerY - (ret.scale * imageY)) / 2.0f;
  		} else {
  			// Image aspect taller than container
  			ret.scale = (float) containerY / imageY;
  			ret.deltaX = ((float) containerX - (ret.scale * imageX)) / 2.0f;
  		}
  		return ret;
  	}
docs: This scales the image so that it fits within the container. The container may have empty space
  at the ends, but the entire image will be displayed.