[cairo] implement clone_similar fallback

Travis Griggs tgriggs at cincom.com
Mon Aug 6 23:15:11 PDT 2007

On Aug 6, 2007, at 22:38, Vladimir Vukicevic wrote:

> Here's a patch after a discussion on irc... basically, the backend  
> clone_similar function was called from two places  
> (clip_init_deep_copy and the pattern acquire_surface_for_gradient),  
> but the function isn't a required one for backends to implement.   
> So if it ever failed, both of these functions just failed.
> It was hard to hit either of these cases -- the win32 surface  
> didn't implement clone_similar, but it also never used  
> pattern_acquire_surface, and the other would only be hit if you  
> tried to push_group with a mask clip set.
> Here's a patch that implements fallback for clone_similar; it uses  
> create_similar_scratch and then calls composite with OPERATOR_SOURCE.

Would this explain a weird behavior I saw the other day using the  
Quartz backend? I was doing a push/pop_group, and had a clip shape  
that was trapezoidal (not rectangular). It worked great on X11, but  
on Quartz, I got the "extents" of the trapezoid.

Travis Griggs
One man's blue plane is another man's pink plane.

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