[cairo] Extending XRender to support non-blurry edges for transformations(?)

[Bill Spitzak]

Carl Worth wrote:

> Beyond that, though, there's an issue of what do you actually want? You
> mentioned wanting to draw a rotated image without using PAD sampling and
> a mask. And you do want BILINEAR filtering internal to the image, but
> not on the edges. Do you see that you are necessarily asking for a
> non-antialiased result around the edge of the image? Is this what you
> really want?

I think he is asking for an antialiased but "sharp" result.

It should be exactly the same as if the filtering was set it to 
EXTEND_REPEAT and set the clip region to the rectangle surrounding the 
picture (transformed by the CTM).

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