[Pixman] [cairo] scaling performance test of cairo library

[cooolheater]

I also tested for text, and the result was unaccountable.

I couldn't find the method for scaling text in skia canvas,
so I compared between cairo and skia with differentiating fontsize and text
length,
then the result was the skia is about 10 times faster than cairo in drawing
text.

I think the test was wrong, but I can't find the wrong point.
I compared the execution time between SkCanvas::drawText and
cairo_show_text.

If cairo_show_text is really so slower than similar function in skia, what
can I do for getting a faster execution time in cairo?
Using the cairo_show_glyphs can be better?


On Thu, Feb 10, 2011 at 10:16 AM, Siarhei Siamashka <
siarhei.siamashka at gmail.com> wrote:

> 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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