[cairo] Operator optimization based on source or dest opacity

[Vladimir Vukicevic]

On Feb 27, 2008, at 12:36 AM, Antoine Azar wrote:
> I've benchmarked the most relevant performance cases and posted them  
> here:
> http://www.antoineazar.com/optimization_final.htm
> Any perf increase above 5% is in bold green and perf decreases below  
> 5% in bold red

One thing to be aware of... while the perf gains are significant, it  
means that the test suite isn't actually exercising painting an image  
with alpha transparency with OVER since the images are all opaque.   
You should probably replace the images so that the actual OVER  
compositing path is being tested :)  (Or maybe create new tests,  
though I don't think there's much value in doing lots and lots of  
tests with the OVER-to-SOURCE optimization.)

     - Vlad

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