public class SizeConfigStrategy
Keys Bitmaps using both Bitmap.getAllocationByteCount() and the Bitmap.Config
returned from Bitmap.getConfig().
Using both the config and the byte size allows us to safely re-use a greater variety of Bitmaps, which increases the hit rate of the pool and therefore the
performance of applications. This class works around #301 by only allowing re-use of Bitmaps with a matching number of bytes per pixel.