[cairo] scaling performance test of cairo library

[Siarhei Siamashka]

On Wednesday 09 February 2011 08:23:51 Siarhei Siamashka wrote:
> On Wednesday 09 February 2011 05:28:46 cooolheater wrote:
> > Thank you for your kind explanation.
> > I used pixman-0.21.4 for testing.
> > As you guessed, we are using SIMD and are finding method for NEON
> > acceleration.
> > Could you let me know the bilinear scaling interfaces in pixman and
> > where the SIMD optimization will be applied?
> 
> You can look here for the start:
> http://cgit.freedesktop.org/pixman/tree/pixman/pixman-bits-image.c?id=pixma
> n-0.21.4#n189
> 
> But applying optimizations locally just for this small function is not
> going to provide the best performance, it's kind of like swinging a
> large polearm in a narrow passage is not so effective.

And here is an example of such patch attached. Performance improvement is not
impressive at all. Who cares if it's now let's say ~15x slower than nearest
scaling instead of ~30x?

Obviously we need a better solution.

-- 
Best regards,
Siarhei Siamashka
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