Romain Guy f219da5e32 Don't blend transparent pixels when rendering layers.
With this change, the rendere keeps track of what regions are rendered into
and generates a mesh that matches these regions exactly. The mesh is used
to composite the layer on screen.

Change-Id: I1f342576b9134fb29caff7fb8f4c1da179fe956d
2011-01-16 12:54:25 -08:00
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