Hi,
I was updating a desktop tool of mine to use Qt 5.8. In this tool I use
software backend to render its contents.
Since I need to have a system tray icon to open it again when it is
closed, I instantiate it as a QQuickView. This is what I do:
// on Qt 5.7
qputenv("QMLSCENE_DEVICE","softwarecontext");
QApplication::setAttribute(Qt::AA_UseSoftwareOpenGL);
// on Qt 5.8
QQuickWindow::setSceneGraphBackend(QSGRendererInterface::Software);
QQuickView view;
view.setSource(QUrl("qrc:/qml/main.qml"));
view.setResizeMode(QQuickView::SizeRootObjectToView);
QObject::connect(view.engine(), SIGNAL(quit()), qApp, SLOT(quit()));
view.show();
QAction *quitAction = new QAction(app.tr("&Quit"), &view);
QAction *openAction = new QAction(app.tr("&Open"), &view);
app.connect(quitAction, SIGNAL(triggered()), &app, SLOT(quit()));
app.connect(openAction, SIGNAL(triggered()), &view, SLOT(show()));
With Qt 5.7 when I close and open the window, it appears correctly. With
Qt 5.8, after closing and opening the window again, everything goes
white. The controls are there and get updated if I interact with them
but it seems lacking a fullscreen refresh.
If I disable the SoftwareBackend everything works as expected. I suspect
this is a bug from Qt 5.8 software backend implementation.
Should I report a bug?
Regards,
Nuno
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