changing KGraphicsUtils?

[Matthew Woehlke]

Michael Pyne wrote:
> On Thursday 31 May 2007, Thomas Zander wrote:
>> It doesn't help anyone to state your opinion on it with a sad smiley and
>> it certainly doesn't add any value to the method.  Its just being nasty
>> at your fellow programmers. Please don't do that.
> 
> It adds value by identifying the method for future optimization efforts 
> (although profiling is still the best way).

In terms of demonstrable speed difference, I posted data a while back 
indicating that the current blendColors() is 20x-50x slower than 
KColor::blend(). I would expect mix() to be comparable to, or slightly 
faster than KColor::blend(). At minimum if blendColors()/overlayColors() 
stays around we could optimize the default case, however as the part of 
the comment Thomas didn't quote indicates, ATM using QPainter is the 
only way to be 110%* sure the behavior is the same as Qt.

(* since I believe the blend modes are based on well-known algorithms, I 
don't expect them to change, but...)

-- 
Matthew
"943. I am not Bjorn of Borg."
  -- from 975 things Mr. Welch can no longer do in an RPG
http://theglen.livejournal.com/16735.html