int main(int argc, char *argv[])
{
    //--> 
    QGuiApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
    QtQuickControlsApplication app(argc, argv);
    if (QCoreApplication::arguments().contains(QLatin1String("--coreprofile"))) {
        QSurfaceFormat fmt;
        fmt.setVersion(4, 4);
        fmt.setProfile(QSurfaceFormat::CoreProfile);
        QSurfaceFormat::setDefaultFormat(fmt);
    }