[Interest] Poor retina support for QGraphicsView on macOS?

[Patrick Stinson]

Hello!

I am seeing the antialiasing is still quite grainy using a QGraphicsView on mac. Is it possible to increase the device pixel ratio, or something similar?

See attached screenshots, expanding to full rez before viewing. Note smoothness of retina button pixmaps at left VS jagged lines in middle.

I am using a QOpenGLWidget for the viewport (though this doesn’t seem to matter):

view.setViewport(QOpenGLWidget())
I am painting QPainterPaths like this:

def paint(self, painter, option, widget):
    painter.save()
    painter.setPen(self.pen)
    painter.setBrush(self.brush)
    painter.drawPath(self.path)
    painter.restore()
with the following render hints:

view.setRenderHints(QPainter.Antialiasing|QPainter.HighQualityAntialiasing|QPainter.SmoothPixmapTransform|QPainter.TextAntialiasing)
and the following attribute set on the QApplication:

app.setAttribute(Qt.AA_UseHighDpiPixmaps, True)
Thanks!
-P






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