I have a 2D scene graph which includes an opacity filter for graph
nodes.  As I walk the tree, I'd like to be able to set my opacity -
for example, if I set opacity to .8, then all vector and bitmap draws
after that will have their alpha multiplied by .8 (in addition to
whatever alpha they may already have).

I'm looking for something that would be similar to Swing's
AlphaComposite.  So far I've tried adding a LightingColorFilter and a
ColorMatrixColorFilter to my Paint, but neither seem to have any
affect (at least, the test oval that I'm drawing has its alpha
unaltered).

Is there a way to cause all rendering to fade?

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