[cairo] Supersampling - 1st attempt

Krzysztof Kosiński tweenk.pl at gmail.com
Tue Aug 10 14:44:03 PDT 2010

Hello all

Patch contains initial attempt at supersampling in Pixman. Only
bitmaps ("bits images") are supersampled, and the resampling filter is
a simple box filter (average over the subpixels). To test, uncomment
the fragment in pixman-bits-image.c - this will cause the sampling
rate to adapt to the transformation matrix.

1. Is bits_image_fetch_transformed the right place for supersampling?
2. Shouldn't we use nearest-neighbor sampling to obtain subpixels?
3. The performance isn't very good at the moment - any ideas on how it
could be improved?

Regards, Krzysztof
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