[Interest] How are High DPI Icons supposed to work?

[Julius Bullinger]

Dear List,

is there any clear and concise How To for High DPI icons/pixmaps? I gathered 
some information from several Wiki pages, Blog posts and documentation pages 
[1-7], but no luck.

My MNWE (minimal not working example):

// from main.cpp
int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
  a.setAttribute(Qt::AA_UseHighDpiPixmaps);

  MainWindow w;
  w.show();

  return a.exec();
}


// from mainwindow.cpp

MainWindow::MainWindow(QWidget *parent) :

  QMainWindow(parent)

{



  QPixmap pixmap(":/icons/48x48/icon.png");

  QPixmap pixmap2x(":/icons/48x48/i...@2x.png");

  pixmap2x.setDevicePixelRatio(2);



  QLabel* pbLabel = new QLabel();

  pbLabel->setText(tr("PushButton:"));



  QPushButton* pushButton = new QPushButton();

  pushButton->setIcon(pixmap2x);

  pushButton->setIconSize(QSize(48, 48));



  QVBoxLayout* layout = new QVBoxLayout();

  layout->addWidget(pbLabel);

  layout->addWidget(pushButton);



  QWidget* centralWidget = new QWidget();

  centralWidget->setLayout(layout);

  setCentralWidget(centralWidget);

}

What am I missing?

Best regards,
Julius

[1]: 
http://blog.qt.io/blog/2013/04/25/retina-display-support-for-mac-os-ios-and-x11/
[2]: http://wiki.qt.io/Icons_In_Qt_Quick_Controls
[3]: http://doc.qt.io/qt-5/scalability.html
[4]: http://doc.qt.io/qt-5/qicon.html#pixmap
[5]: http://doc.qt.io/qt-5/highdpi.html
[6]: http://www.kdab.com/pixels-trust-scalable-uis-qml-part-2/
[7]: https://bugreports.qt.io/browse/QTBUG-44486



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