Review Request 108992: Simple optimizations in SignalPlotter

[Raul Fernandes]

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http://git.reviewboard.kde.org/r/108992/
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Review request for Plasma.


Description
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- create variables and classes outside the loops
- reserve space in QList if we know already how many items will be added (avoid unnecessary reallocations)
- use const_iterator when possible
- remove a useless call (p->setPen(Qt::NoPen) - it will be set latter before be used)
- avoid multiplications (x3, x2, x1 and x0)


Diffs
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  plasma/widgets/signalplotter.cpp 8e9e294 

Diff: http://git.reviewboard.kde.org/r/108992/diff/


Testing
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I have tested with KDE 4.10 with no problems.
I have seen a improvement of about 5% in drawPlots() function, the most expensive function in painting.


Thanks,

Raul Fernandes

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