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Fix a crash when creating views on the placeholder screen

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When a compositor has no outputs listed Qt creates a dummy placeholder
QScreen object that does not represent a wl_output.

This should still be fixed in the clients to not create a view, it's
wasteful and probably will still have plenty of other bugs, hence the
giant warning, but it's still worth guarding.

CCBUG: 439096
This commit is contained in:
David Edmundson 2021-07-13 14:15:06 +01:00
parent 331505a4d2
commit 4a439143ba
1 changed files with 9 additions and 1 deletions
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10
src/qwaylandlayersurface.cpp
View file

@ -8,6 +8,7 @@
#include "interfaces/shell.h"
#include "qwaylandlayershell_p.h"
#include "qwaylandlayersurface_p.h"
#include "layershellqt_logging.h"
#include <QtWaylandClient/private/qwaylandscreen_p.h>
#include <QtWaylandClient/private/qwaylandsurface_p.h>
@ -22,7 +23,14 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShell *shell, QtWaylandC
LayerShellQt::Window *interface = Window::get(window->window());
Q_ASSERT(interface);
init(shell->get_layer_surface(window->waylandSurface()->object(), window->waylandScreen()->output(), interface->layer(), interface->scope()));
// Qt will always assign a screen to a window, but if the compositor has no screens available a dummy QScreen object is created
// this will not cast to a QWaylandScreen
QtWaylandClient::QWaylandScreen *screen = window->waylandScreen();
if (screen->isPlaceholder()) {
qCWarning(LAYERSHELLQT) << "Creating a layer shell for placeholder screen. This will be positioned incorrectly";
}
init(shell->get_layer_surface(window->waylandSurface()->object(), screen->isPlaceholder() ? nullptr : screen->output(), interface->layer(), interface->scope()));
Window::Anchors anchors = interface->anchors();