QRegion class can only create Rectangle and Ellipse region, but Ellipse region is aliasing.
QPainterPath class can set "Antialiasing" flag, and can create a round rectangle without aliasing easily, but it can NOT convert to a QRegion. Now I want to get a round rectangle which is a QRegion, it's difficult, to me.
So the question is also like this : How to get a Antialiasing Ellipse which is a QRegion?
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