[Interest] Poor retina support for QGraphicsView on macOS?

[Patrick Stinson]

That is correct, this did fix the antialiasing issue at the expense of performance. I suppose it is a trade off.

> On Oct 7, 2017, at 1:09 AM, Christian Gagneraud <chgans at gmail.com> wrote:
> 
>> On 7 October 2017 at 16:11, Patrick Stinson <patrickkidd at gmail.com> wrote:
>> 
>> 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):
> 
> I vaguely remember that anti-aliasing doesn't work with an OpenGL view
> (that was on a Linux machine).
> 
>> view.setViewport(QOpenGLWidget())
> 
> Don't do that and the anti-aliasing will work.
> 
> Chris
> 
> 
> 
>> 
>> 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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