[cairo] Bug with paint_with_alpha and perf issues when compositing with SOURCE

Behdad Esfahbod behdad at behdad.org
Tue May 27 00:20:15 PDT 2008

On Tue, 2008-05-27 at 00:42 -0400, Antoine Azar wrote:
> Hey all,   I sent out this email some time ago but didn't get any
> feedback. Does anyone have any objection to having a composite_source
> function in the backends,

Yes.  There's no rationale for that.

> and a fallback to pixman for the backends that don't support it the
> way we define it?

What's the point then?  I don't see any.  Backends can already condition
on the source.  What does a new backend function offer?

> That would allow big speedups and correct rendering.   Or is it
> useless to spend much time and effort on that as SOURCE compositing is
> not frequently used (and/or no one ever complained about it?) ?   

Yeah, that too.

> Antoine

"Those who would give up Essential Liberty to purchase a little
 Temporary Safety, deserve neither Liberty nor Safety."
        -- Benjamin Franklin, 1759

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