painting suggestions

[Riccardo Iaconelli]

On Monday 22 September 2008 02:04:04 Robert Knight wrote:
> Fredrik has answered this one on techbase:
>
> http://techbase.kde.org/Development/Tutorials/Graphics/Performance#QPainter
>::setOpacity.28.29

This changes the opacity of the start pixmap, while I want to decrease opacity 
just for that single painting operation, keeping the cached pixmap intact.

So the two options are:
a) create a copy of the cached pixmap and use the above trick on it.
b) use QPainter::setOpacity()

Which one is the cheapest?

-Riccardo
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