[cairo] Clip region problems

[Keith Packard]

On Wed, 2005-05-18 at 15:49 -0400, Owen Taylor wrote:

> I think this is clearly the semantic we want. The problem is that 
> libpixman and RENDER don't work that way. 

RENDER can work this way; you just need to create another Picture
referencin the same drawable.  There are other Picture attributes
modified when using a Drawable as a pattern.

To solve this, I just need to create a new cairo_surface_t that
references the same pixels for each pattern.  This seems like an easy
thing to do; I'll try that today.

-keith


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