From cbc74ba6d7186457d8d07183272e952dee5f34f9 Mon Sep 17 00:00:00 2001 From: Georges Basile Stavracas Neto Date: Thu, 27 May 2021 19:55:04 -0300 Subject: [PATCH] Client: Don't always recreate frame callbacks The main QWaylandWindow method that is executed when handling updates is QWaylandWindow::handleUpdate(). This method always, unconditionally queues a frame callback, regardless of whether any other one is already queued. On some circumstances, e.g. when a window is hidden or completely obscured by other windows, it stops receiving frame callbacks from the compositor. However, QWaylandWindow would continue to request for them, which eventually fills up the Wayland socket, and causes the application to crash. This can be avoided by checking if the platform window is already waiting for a frame callback, before queueing another one. In QWaylandWindow::handleUpdate(), check if mWaitingForFrameCallback is true before queueing frame callbacks, and early return if that's the case. The XDG-shell test needed to be updated for this: The mock compositor is not responding to any frame callbacks, so the window will be unexposed, no longer get paint events and therefore not trigger any commit. This worked by accident before because we were issuing updates quickly enough to reset the timer before it had a chance to unexpose the window. The easiest fix is just to disable the dependency on frame callbacks in this test, since that is clearly not what it's testing. Task-number: QTBUG-81504 Change-Id: Ieacb05c7d5a5fcf662243d9177ebcc308cb9ca84 Reviewed-by: Qt CI Bot Reviewed-by: Georges Basile Stavracas Neto Reviewed-by: Eskil Abrahamsen Blomfeldt --- src/client/qwaylandwindow.cpp | 4 ++++ tests/auto/client/xdgshell/tst_xdgshell.cpp | 2 ++ 2 files changed, 6 insertions(+) diff --git a/src/client/qwaylandwindow.cpp b/src/client/qwaylandwindow.cpp index a708afce..d83d5169 100644 --- a/src/client/qwaylandwindow.cpp +++ b/src/client/qwaylandwindow.cpp @@ -1357,6 +1357,10 @@ void QWaylandWindow::requestUpdate() void QWaylandWindow::handleUpdate() { qCDebug(lcWaylandBackingstore) << "handleUpdate" << QThread::currentThread(); + + if (mWaitingForFrameCallback) + return; + // TODO: Should sync subsurfaces avoid requesting frame callbacks? QReadLocker lock(&mSurfaceLock); if (!mSurface) diff --git a/tests/auto/client/xdgshell/tst_xdgshell.cpp b/tests/auto/client/xdgshell/tst_xdgshell.cpp index 1d2a2014..962093c7 100644 --- a/tests/auto/client/xdgshell/tst_xdgshell.cpp +++ b/tests/auto/client/xdgshell/tst_xdgshell.cpp @@ -138,6 +138,7 @@ void tst_xdgshell::configureSize() void tst_xdgshell::configureStates() { + QVERIFY(qputenv("QT_WAYLAND_FRAME_CALLBACK_TIMEOUT", "0")); QRasterWindow window; window.resize(64, 48); window.show(); @@ -186,6 +187,7 @@ void tst_xdgshell::configureStates() QCOMPARE(window.windowStates(), Qt::WindowNoState); QCOMPARE(window.frameGeometry().size(), windowedSize); // QCOMPARE(window.frameGeometry().topLeft(), QPoint()); // TODO: this doesn't currently work when window decorations are enabled + QVERIFY(qunsetenv("QT_WAYLAND_FRAME_CALLBACK_TIMEOUT")); } void tst_xdgshell::popup() -- 2.38.1