Hi, > you can also call setOpacity on the QPainter directly, but that can *very* > slow and that above method is usually faster, and at worst the same speed.
Aaron explained it pretty well, and please, don't use setOpacity (as also Aaron did suggest). I want to put emphasis here... since setOpacity disables all the hardware acceleration (as Fredrik said: "the kiss of death"). Check out this techbase tutorial for further information: http://techbase.kde.org/Development/Tutorials/Graphics/Performance Regards, Rafael Fernández López.
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