[cairo] Patch improving fallbacks

[Keith Packard]

Around 8 o'clock on Jan 31, Tim Rowley wrote:

> In my case, implementing SVG in mozilla, I do care about what was
> drawn underneath - SVG fragments are supposed to be composited
> with the rest of page, which is drawn with QuickDraw/Quartz.

Right now, you can interpose native and cairo graphics in arbitrary order 
and 'the right thing' happens.  That's nice, but the cost is horrendous; 
every cairo operation must be bracketed with getting and putting the 
contents of the native object.

The change that we've considered is to make the application developer help 
out by telling cairo when to fetch and restore the native object contents.
This should dramatically improve performance when cairo must draw things 
in software.

-keith


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