Cairo currently does only bilinear interpolation.
This is wrong for any scale less than 1, although the artifacts do not
really appear until a scale less that .5. Bilinear cannot use more than
4 adjacent pixels in a square to produce an output pixel, and if you
scale small enough the destination pixel will cover far more than 4
pixels in the source.
I think everybody is in agreement that this needs to be fixed.
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