[cairo] set_source_rgb vs set_source_rgba [Performance]
behdad at behdad.org
Fri Aug 15 10:45:06 PDT 2008
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?
Note that alpha>1.0 may have varying interpretations in the future.... (HDR, etc).
> Ian Britten wrote:
>> Hi all, When drawing solid colours (Alpha=1.0), is there any
>> performance benefit to using set_source_rgb() as opposed to
>> I'm wondering whether to add the complexity to my code to
>> distinguish the two cases and make the appropriate calls, or
>> whether simply calling set_source_rgba() all the time will
>> automatically fall back to same behaviour? [ Obviously, rendering
>> speed is a concern, and I'll add the complexity to our code, if
>> there's a benefit ]
>> Thanks! Ian _______________________________________________ cairo
>> mailing list cairo at cairographics.org
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