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QOffscreenSurface: Suppress setting of a default geometry on the window 

When investigating the bug report, it was discovered that the
offscreen window is assigned a default geometry by
QPlatformWindow::initialGeometry(), causing subsequent resize events
and flushing of event queues. Suppress that by making it a popup which
is not subject to window title bar restrictions on Windows and setting
the respective flags.

Task-number: QTBUG-74176
Change-Id: I7f9c1a3bfd57072c8188a98124bde87491dd25eb
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
bb10
Friedemann Kleint 2019-03-22 08:39:23 +01:00
parent e1167ed650
commit 10327549cb
1 changed files with 8 additions and 0 deletions
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8
src/gui/kernel/qoffscreensurface.cpp
View File

@ -46,6 +46,8 @@
#include "qwindow.h"
#include "qplatformwindow.h"
#include <private/qwindow_p.h>
QT_BEGIN_NAMESPACE
/*!
@ -199,12 +201,18 @@ void QOffscreenSurface::create()
if (QThread::currentThread() != qGuiApp->thread())
qWarning("Attempting to create QWindow-based QOffscreenSurface outside the gui thread. Expect failures.");
d->offscreenWindow = new QWindow(d->screen);
// Make the window frameless to prevent Windows from enlarging it, should it
// violate the minimum title bar width on the platform.
d->offscreenWindow->setFlags(d->offscreenWindow->flags()
| Qt::CustomizeWindowHint | Qt::FramelessWindowHint);
d->offscreenWindow->setObjectName(QLatin1String("QOffscreenSurface"));
// Remove this window from the global list since we do not want it to be destroyed when closing the app.
// The QOffscreenSurface has to be usable even after exiting the event loop.
QGuiApplicationPrivate::window_list.removeOne(d->offscreenWindow);
d->offscreenWindow->setSurfaceType(QWindow::OpenGLSurface);
d->offscreenWindow->setFormat(d->requestedFormat);
// Prevent QPlatformWindow::initialGeometry() and platforms from setting a default geometry.
qt_window_private(d->offscreenWindow)->setAutomaticPositionAndResizeEnabled(false);
d->offscreenWindow->setGeometry(0, 0, d->size.width(), d->size.height());
d->offscreenWindow->create();
}