Vc branch ready for testing

[Sven Langkamp]

Hi,


I have pushed the krita-vc-langkamp branch. It does implement the brush
mask computation with vc.
To build the branch you need a cpu with SSE2 and Vc 0.61 or git:
http://code.compeng.uni-frankfurt.de/projects/vc
AVX should work too, but requires a change in the Krita cmake file.

With the branch there is around 15x speedup in the mask benchmark and about
2-3x speedup in the stroke benchmark (for brushes without random and
density).
No idea how much performance improvement that gives during real painting,
so that needs testing.



Sven
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