HiDPI and SVG icon resolution

cle1109

Also, here's my main.pro file I used to build the app. It doesn't make a difference whether or not I include svg.

TEMPLATE = app
TARGET = main

QT = core gui widgets

SOURCES += main.cpp

SimonSchroeder

You'll need to use the trick with the QPixmap and QPainter in C++ as well. In the background Python and C++ use the exact same functionality, so I wouldn't expect any other behavior without the workaround. (I have experienced this exact problem in C++ multiple times.)

For your main.pro you need to add the svg module also:

...
QT = core gui widgets svg
...

This is what I actually meant with my last post.

cle1109

You'll need to use the trick with the QPixmap and QPainter in C++ as well. In the background Python and C++ use the exact same functionality, so I wouldn't expect any other behavior without the workaround. (I have experienced this exact problem in C++ multiple times.)

I get exactly the same result as in Python (the icon is just a random pixel pattern).

Yes, I know what you meant, I tried adding svg but it didn't make any difference. Same for the workaround. So in conclusion, this seems to be a Qt bug on macOS which also affects PyQt5.

cle1109

Turns out there is a simple solution:

app.setAttribute(Qt.AA_UseHighDpiPixmaps)