Highlight arbitrary widget with blinking background or halo.

[p-himik]

Hello.
Suppose I have a widget which has mask and/or gradient as a background color and/or border radius. To highlight it I need a QRegion containing visible part of widget not hovered by other windows (even if it is).
Is there any way to do it?

I did some experiments with QPixmap::grabWidget but it doesn't take into account neither mask nor border.