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author | Friedemann Kleint <Friedemann.Kleint@qt.io> | 2019-03-22 08:39:23 +0100 |
---|---|---|
committer | Friedemann Kleint <Friedemann.Kleint@qt.io> | 2019-04-11 10:48:59 +0000 |
commit | 10327549cb91aa77e778c03c797a705241f1f06d (patch) | |
tree | d677cf142c9f1fd955b6041bb2367df267382f31 /src/gui | |
parent | e1167ed650afae90ab4b73036f58ae0f416ae500 (diff) |
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>
Diffstat (limited to 'src/gui')
-rw-r--r-- | src/gui/kernel/qoffscreensurface.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/gui/kernel/qoffscreensurface.cpp b/src/gui/kernel/qoffscreensurface.cpp index ae027af627..0cc11ca3bb 100644 --- a/src/gui/kernel/qoffscreensurface.cpp +++ b/src/gui/kernel/qoffscreensurface.cpp @@ -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(); } |