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

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This review has been submitted with commit d974f5f7f40dc0d417aa38968358db2810deebb0 by Nick Shaforostoff to branch KDE/4.7.

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On Dec. 6, 2011, 5:53 p.m., Nick Shaforostoff wrote:
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> (Updated Dec. 6, 2011, 5:53 p.m.)
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> 
> Review request for kdelibs.
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> Description
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> pretty straightforward and small optimization of kde apps startup time:
> avoid calculating luma for the same colors multiple times.
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> callgrind shows it is called 4503 times
> instead of 12087 at startup of kwrite, which is 1.5%.
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> Diffs
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>   kdeui/colors/kcolorutils.cpp efe8cdd 
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> Diff: http://git.reviewboard.kde.org/r/103348/diff/diff
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> Testing
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> kwrite starts fine with the new kdeui lib
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> Thanks,
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> Nick Shaforostoff
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>

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