#ifdef Q_OS_ANDROID
    //  BUG with dpi on some androids: https://bugreports.qt-project.org/browse/QTBUG-35701
    //  Workaround:
    QAndroidJniObject qtActivity = QAndroidJniObject::callStaticObjectMethod("org/qtproject/qt5/android/QtNative", "activity", "()Landroid/app/Activity;");
    QAndroidJniObject resources = qtActivity.callObjectMethod("getResources", "()Landroid/content/res/Resources;");
    QAndroidJniObject displayMetrics = resources.callObjectMethod("getDisplayMetrics", "()Landroid/util/DisplayMetrics;");
    int density = displayMetrics.getField<int>("densityDpi");
#else
    QScreen *screen = qApp->primaryScreen();
    float density = screen->physicalDotsPerInch();
#endif

    engine.rootContext()->setContextProperty("mm",density / 25.4);
    engine.rootContext()->setContextProperty("pt", 1);

    double scale = density < 180 ? 1 :
                   density < 270 ? 1.5 :
                   density < 360 ? 2 : 3;
    engine.rootContext()->setContextProperty("dp", scale);