[cairo] broken pixman bilinear filtering?

[Bertram Felgenhauer]

Vladimir Vukicevic wrote:
> The attached test produces a png like the attached output; the first
> square is the 3x3 image scaled up 20x with bilinear filtering, and the
> second is the image scaled up with nearest neighbour.  It looks like
> for bilinear the center of the coverage region for the pixel at source
> 0,0 is placed at 0,0 in the destination, when instead it should be
> offset by half the size of the destination area covered by a single
> pixel.
> 
> I don't dare delve into pixman myself to look into this, I don't think :)

the patch at https://bugs.freedesktop.org/show_bug.cgi?id=2488 should
fix that. (the attached picture was created using it)

regards,

Bertram
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