[Pixman] [PATCH 2/2] MIPS: DSPr2: Added bilinear over_8888_8_8888 fast path.

[Siarhei Siamashka]

On Thu, May 3, 2012 at 1:03 AM, Nemanja Lukic <nlukic at mips.com> wrote:
> From: Nemanja Lukic <nemanja.lukic at rt-rk.com>
>
> Performance numbers before/after on MIPS-74kc @ 1GHz
>
> Referent (before):
>
> cairo-perf-trace:
> [ # ]  backend                         test   min(s) median(s) stddev. count
> [ # ]    image: pixman 0.25.3
> [  0]    image             firefox-fishtank 2289.180 2290.567   0.05%    5/6
>
> Optimized:
>
> cairo-perf-trace:
> [ # ]  backend                         test   min(s) median(s) stddev. count
> [ # ]    image: pixman 0.25.3
> [  0]    image             firefox-fishtank 1700.925 1708.314   0.22%    5/6

BTW, it is also really easy to tweak lowlevel-blt-bench to also
optionally benchmark NEAREST and BILINEAR scaling and get some
synthetic MPix/s statistics for these cases. The only thing which
needs to be done is to simply apply an almost-identity matrix to the
source image. It will prevent pixman from using unscaled fast paths,
while having only minimal effect on the result of actual compositing
operations (so unscaled MPix/s numbers can be even directly compared
with scaled MPix/s for every operation).

Anybody willing to submit a patch?

-- 
Best regards,
Siarhei Siamashka