[cairo] Cairo 1.6.4 Quartz crash: CGImageCreateCopy misuse

[Vladimir Vukicevic]

Paul,

Can you try the attached patch and see if it fixes the problem for  
you?  Note that in most cases this will result in a copy of the image  
data being created -- to avoid this, you should use the (experimental)  
cairo-image-surface and have it backed by an image surface that owns  
its own data.  That way the lifecycle issues are handled via  
refcounting, and no copy is needed.

     - Vlad

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