[cairo] Virtual surface

[Mike Emmel]

Opps forgot to change the title.

Hi all I have a good start on a virtual surface backed by a real surface.

I've found it very useful for scaled widgets virtual screens and other
cases where you wan't the hard clipping provided by a surface and
other surface features but don't want a buffer or image surface. Such
as when the backing surface is already buffered.

It seems to work fairly well but needs critique on both the code and
the concept.
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