QPainter::Antialiasing no effect with QOpenGLWidget

I have a QOpenGLWidget, and in the paintGL function I have a QPainter, and I set
QPainter Painter(this);
Painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);

On desktop the antialiasing flag is working fine, but not on android.
On Android, with or without that renderhint, the result is the same.