[cairo] Mesh Gradients again

[Franz Schmid]

Hi all,

i just tested Adrian Johnsons mesh gradient branch[1], and it works
fairly well. See the attached images and sample code.

It would be really great, if this branch could be revised and
integrated into the next cairo-1.9.x snapshot.

Cairo would be the first library which brings mesh gradient rendering
to Linux. It would enable us (the Scribus Team) to integrate this cool
feature into our development branch.

Problems i noticed during testing:
- Rendering with alpha values != 1 isn't completly perfect, there are
  rendering issues along the borders of the patches.

- Clipping isn't correct at all, but this may due to the branch i'm using.

Greetings,

Franz Schmid
The Scribus Team

1) http://cgit.freedesktop.org/~ajohnson/cairo/log/?h=mesh
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