[cairo] Where's the bottleneck in using glitz/cairo/librsvg?

[David Turner]

Hello Mirco, and all Cairo hackers,

I've taken the liberty of using your original "cairo-dock" program to 
profile Cairo.
The results have been surprising, and I've been able to identify several 
problematic
"low-hanging fruits" that can be relatively easily optimized.

I've then written a patch that optimizes several aspects of Cairo, and 
this results
in a global speedup of 22% of your program. I'm not saying that all 
Cairo operations
will be accellerated by this amount, or that this is enough to get 
decent speed on your
original program, but I though I could share my findings and improvements.

You'll find the patch, the modified program and a lot more information 
at the
following page:

  http://turnerdavid.neuf.fr/desktop/index.html

I'll try to install 'git' on my machine in order to be able to push the 
optimizations through
it in a few days. I believe there are still very important opportunities 
for optimization,
but these will require very hard work. And I don't have that much free 
time :-)

Hope this helps,

- David Turner
- The FreeType Project  (www.freetype.org)


Mirco Müller a écrit :
> Am Donnerstag, den 08.06.2006, 06:27 -0400 schrieb Michael Sweet:
>  
>   
>>> As far as I know, Mac OS X's icons are bitmap and nobody questions about 
>>> its quality. Simply becasue original size is large enough (128x128), and 
>>> they do filtered scaling.
>>>       
>> Actually, MacOS X icons are more complex than that - the icns format
>> stores multiple resolutions - 16x16, 32x32, 64x64, and 128x128 - to
>> provide optimal display/scaling at different sizes.
>>     
>
> 	It looks like I will do something like this... my own "mipmap-pyramid"
> just like in plain OpenGL-coding. The only benefit will be that it will
> be generated from SVGs. That in finally really using glitz-surfaces will
> hopefully yield my targetted 60 fps with little to "no" cpu-usage at
> all.
>
> 	Still a pity something like has to be done, although one is using a
> vector-graphics library. But maybe using glitz-surfaces turns out to be
> fast enough to do SVG-painting on the fly... this is what I still hope
> for.
>
> Best regards...
>
> Mirco "MacSlow" Müller
>
>   


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