[cairo] Reg. Cairo Performance with DirectFB bacend

[Vicky Tux]

Hi folks,

I'm facing low performance issue while using cairo with directfb as a
backend. Actual problem was while using cairo to draw bunch of
transparent  rectangles, it takes very much time, but no issues with opaque
rectangles.

While analysing the issue I found that semi transparent rectangles were not
drawn directly to the surface, instead it was drawn by creating another
backend surface & drawn opaquely, but the transparency was applied by
creating a mask.

So why this is happening..?

Please help to resolve.

Note:
-------

I'm testing things with webkit/cairo/directfb

Thanks & Regards,
Arun.
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