code: protected void paintBits (Graphics2D gfx, int layer, Rectangle dirty)
      {
          _metamgr.paintMedia(gfx, layer, dirty);
      }
docs: Renders the sprites and animations that intersect the supplied dirty region in the specified
  layer. Derived classes can override this method if they need to do custom sprite or
  animation rendering (if they need to do special sprite z-order handling, for example).  The
  clipping region will already be set appropriately.