Comment 1 for bug 931883

As a comment here, I think what we'll /try/ to do is implement shadow paint layers, since the clipping code is not exactly ... performant (but a start).

I'm not really sure here, whether its appropriate to actually have shadows generated by compiz itself and essentially retire the shadow generation in libdecoration .... There's the obvious problem here with nonrectangular windows and decorations and trying to clip the shadows off and render them elsewhere ...