code: protected void paintTiles (Graphics2D gfx, Rectangle clip)
      {
          // go through rendering our tiles
          _paintOp.setGraphics(gfx);
          _applicator.applyToTiles(clip, _paintOp);
          _paintOp.setGraphics(null);
      }
docs: Renders the base and fringe layer tiles that intersect the
  specified clipping rectangle.