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        pixman_image_set_supersampling (image, filter, x, y),
        pixman_image_set_point_sampling (image);

or maybe

        pixman_image_set_sampling (image, algorithm, parameters...);

where algorithm would be { POINT, BOX, ... } and parameters would be
specific to the algorithm. This would leave the door open for adding
other algorithms later.

A concern is that many sampling algorithms only apply to certain types
of images. For example, area sampling a radial gradient would probably
be rather complicated.


Soren