fix compilation error

Zhao Yuhang

2025-02-04 cc65c4da6ad762e8648b2ab6a801e07c50922d3d

 examples/mainwindow/main.cpp

@@ -9,33 +9,22 @@
int main(int argc, char *argv[]) {
    qputenv("QT_WIN_DEBUG_CONSOLE", "attach");
    qputenv("QSG_INFO", "1");
#if 0
    qputenv("QT_WIDGETS_RHI", "1");
    qputenv("QSG_RHI_BACKEND", "d3d12");
    qputenv("QSG_RHI_HDR", "scrgb");
    qputenv("QT_QPA_DISABLE_REDIRECTION_SURFACE", "1");
    
    //qputenv("QT_WIDGETS_HIGHDPI_DOWNSCALE", "1");
    //qputenv("QT_WIDGETS_RHI", "1");
    //qputenv("QSG_RHI_BACKEND", "d3d12");
    //qputenv("QSG_RHI_HDR", "scrgb");
    //qputenv("QT_QPA_DISABLE_REDIRECTION_SURFACE", "1");

#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
    QGuiApplication::setHighDpiScaleFactorRoundingPolicy(
        Qt::HighDpiScaleFactorRoundingPolicy::PassThrough);
#endif

    QCoreApplication::setAttribute(Qt::AA_DontCreateNativeWidgetSiblings);
    QApplication a(argc, argv);

#if 0 && defined(Q_OS_WINDOWS) && QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QApplication::setFont([]() {
        QFont f("Microsoft YaHei");
        f.setStyleStrategy(QFont::PreferAntialias);
        f.setPixelSize(15);
        return f;
    }());
#endif

    MainWindow w;
    w.show();

#if 0
    QMainWindow w2;
    w2.show();
#endif
    return a.exec();
}
}