[cairo] pixman: New ARM NEON optimizations

[Chris Wilson]

Excerpts from Soeren Sandmann's message of Thu Nov 05 11:04:30 +0000 2009:
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> > I could also use a pixman-core, though the overhead after applying
> > Søren's flags branch is not large enough to justify the effort, yet.
> 
> The case where pixman has a lot of overhead is glyphs, which is why
> pixman needs explicit support for that.

I'd argue the opposite. pixman does not need explicit support for
glyphs, just support for passing a RECTLIST to pixman_image_composite().
This then covers spans as well but will still likely incur overhead from
per RECT region computation. A polygon image can be added as a later
refinement. The only question then is who has the most information to
decide what the best image format to use for caches and other
intermediates. It's a mix of quality (application) and
hardware/behaviour characteristics.

But at the moment, about the only thing I truly want to add to the API
is a LERP operator.
-ickle
-- 
Chris Wilson, Intel Open Source Technology Centre
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