[Interest] Qt 5.8 Software Backend Bug on Windows? - Window fails to copmpletly update after closing it and opening it again

[Nuno Santos]

Will do!

Thanks!

Nuno Santos
Founder / CEO / CTO
www.imaginando.pt <http://www.imaginando.pt/>
+351 91 621 69 62

> On 21 Feb 2017, at 11:45, Laszlo Agocs <laszlo.agocs at qt.io <mailto:laszlo.agocs at qt.io>> wrote:
> 
> Certainly. And please include a minimal example to reproduce the problem.
> 
> Cheers,
> Laszlo
> 
> From: Interest <interest-bounces+laszlo.agocs=qt.io at qt-project.org <mailto:interest-bounces+laszlo.agocs=qt.io at qt-project.org>> on behalf of Nuno Santos <nunosantos at imaginando.pt <mailto:nunosantos at imaginando.pt>>
> Sent: Monday, February 20, 2017 1:16:02 PM
> To: interest at qt-project.org <mailto:interest at qt-project.org>
> Subject: [Interest] Qt 5.8 Software Backend Bug on Windows? - Window fails to copmpletly update after closing it and opening it again
>  
> 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 <http://app.tr/>("&Quit"), &view);
> QAction *openAction = new QAction(app.tr <http://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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