[cairo] clip stack composition performance

[Owen Taylor]

On Fri, 2005-06-10 at 10:33 +0200, Alexander Larsson wrote:
> Poppler with cairo is very slow at rendering this file:
> http://people.redhat.com/alexl/files/skydda.pdf
> 
> It turns out that a lot of the time is spent in the general compositor
> code doing PIXMAN_OPERATOR_IN on the a8 clip masks when clip regions are
> stacked on top each other.
> 
> Just for fun I added some special case code for a8 IN operations to
> libpixman, see attached (not very well tested) patch. (Although owen
> said I shouldn't touch the libpixman compositing code until the new
> compositing code from the X server is merged...)

I filed this as:

 https://bugs.freedesktop.org/show_bug.cgi?id=4191

Regards,
						Owen

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