[cairo] set_source_rgb vs set_source_rgba [Performance]

Chris Wilson chris at chris-wilson.co.uk
Fri Aug 15 11:05:16 PDT 2008

On Fri, 2008-08-15 at 13:45 -0400, Behdad Esfahbod wrote:
> Nicholas Allen wrote:
> > I would hope that this makes absolutely no difference if the alpha is
> > 1.0. If it does then it is definately Cairo's fault IMHO.
> I agree.  I have a vague memoy that we did that at some point, but the code
> doesn't show that.  Chris may know?

I did add a check at the entry point to convert a call to set_rgba into
set_rgb if opaque. Behdad chose to move the check down to the
_cairo_pattern_init_solid() so that it covered all paths, as part of his
work into supporting dithering.
Chris Wilson

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