Review Request: optimize kcolorscheme consting time: avoid calculating luma for the same colors multiple times

[Nick Shaforostoff]

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http://git.reviewboard.kde.org/r/103348/
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Review request for kdelibs.


Description
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pretty straightforward and small optimization of kde apps startup time:
avoid calculating luma for the same colors multiple times.

callgrind shows it is called 4503 times
instead of 12087 at startup of kwrite, which is 1.5%.


Diffs
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  kdeui/colors/kcolorutils.cpp efe8cdd 

Diff: http://git.reviewboard.kde.org/r/103348/diff/diff


Testing
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kwrite starts fine with the new kdeui lib


Thanks,

Nick Shaforostoff

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