Make Window ref'able

autotests/integration/stacking_order_test.cpp

@@ -185,7 +185,7 @@ struct WindowUnrefDeleter
     void operator()(Deleted *d)
     {
         if (d != nullptr) {
-            d->unrefWindow();
+            d->unref();
         }
     }
 };
@@ -244,7 +244,7 @@ void StackingOrderTest::testDeletedTransient()
 
     // Close the top-most transient.
     connect(transient2, &Window::windowClosed, this, [](Window *original, Deleted *deleted) {
-        deleted->refWindow();
+        deleted->ref();
     });
 
     QSignalSpy windowClosedSpy(transient2, &Window::windowClosed);
@@ -647,7 +647,7 @@ void StackingOrderTest::testDeletedGroupTransient()
 
     // Unmap the transient.
     connect(transient, &X11Window::windowClosed, this, [](Window *original, Deleted *deleted) {
-        deleted->refWindow();
+        deleted->ref();
     });
 
     QSignalSpy windowClosedSpy(transient, &X11Window::windowClosed);

src/deleted.cpp

@@ -22,7 +22,6 @@ namespace KWin
 
 Deleted::Deleted()
     : Window()
-    , delete_refcount(1)
     , m_frame(XCB_WINDOW_NONE)
     , m_layer(UnknownLayer)
     , m_shade(false)
@@ -40,10 +39,6 @@ Deleted::Deleted()
 
 Deleted::~Deleted()
 {
-    if (delete_refcount != 0) {
-        qCCritical(KWIN_CORE) << "Deleted client has non-zero reference count (" << delete_refcount << ")";
-    }
-    Q_ASSERT(delete_refcount == 0);
     if (workspace()) {
         workspace()->removeDeleted(this);
     }
@@ -108,14 +103,6 @@ void Deleted::copyToDeleted(Window *window)
     m_wasLockScreen = window->isLockScreen();
 }
 
-void Deleted::unrefWindow()
-{
-    if (--delete_refcount > 0) {
-        return;
-    }
-    delete this;
-}
-
 QMargins Deleted::frameMargins() const
 {
     return m_frameMargins;

src/deleted.h

@@ -20,9 +20,7 @@ class KWIN_EXPORT Deleted : public Window
 
 public:
     static Deleted *create(Window *c);
-    // used by effects to keep the window around for e.g. fadeout effects when it's destroyed
-    void refWindow();
-    void unrefWindow();
+
     QMargins frameMargins() const override;
     int desktop() const override;
     QStringList activities() const override;
@@ -137,7 +135,6 @@ private:
 
     QMargins m_frameMargins;
 
-    int delete_refcount;
     int desk;
     QStringList activityList;
     QRectF contentsRect; // for clientPos()/clientSize()
@@ -165,11 +162,6 @@ private:
     bool m_wasLockScreen;
 };
 
-inline void Deleted::refWindow()
-{
-    ++delete_refcount;
-}
-
 } // namespace
 
 Q_DECLARE_METATYPE(KWin::Deleted *)

src/effects.cpp

@@ -1977,7 +1977,7 @@ const EffectWindowGroup *EffectWindowImpl::group() const
 void EffectWindowImpl::refWindow()
 {
     if (auto d = static_cast<Deleted *>(m_window->isDeleted() ? m_window : nullptr)) {
-        return d->refWindow();
+        return d->ref();
     }
     Q_UNREACHABLE(); // TODO
 }
@@ -1985,7 +1985,7 @@ void EffectWindowImpl::refWindow()
 void EffectWindowImpl::unrefWindow()
 {
     if (auto d = static_cast<Deleted *>(m_window->isDeleted() ? m_window : nullptr)) {
-        return d->unrefWindow(); // delays deletion in case
+        return d->unref(); // delays deletion in case
     }
     Q_UNREACHABLE(); // TODO
 }

src/inputpanelv1window.cpp

@@ -160,9 +160,9 @@ void InputPanelV1Window::destroyWindow()
     Q_EMIT windowClosed(this, deleted);
     StackingUpdatesBlocker blocker(workspace());
     waylandServer()->removeWindow(this);
-    deleted->unrefWindow();
+    deleted->unref();
 
-    delete this;
+    unref();
 }
 
 NET::WindowType InputPanelV1Window::windowType(bool, int) const

src/internalwindow.cpp

@@ -371,10 +371,10 @@ void InternalWindow::destroyWindow()
 
     workspace()->removeInternalWindow(this);
 
-    deleted->unrefWindow();
+    deleted->unref();
     m_handle = nullptr;
 
-    delete this;
+    unref();
 }
 
 bool InternalWindow::hasPopupGrab() const

src/layershellv1window.cpp

@@ -181,9 +181,9 @@ void LayerShellV1Window::destroyWindow()
     StackingUpdatesBlocker blocker(workspace());
     cleanGrouping();
     waylandServer()->removeWindow(this);
-    deleted->unrefWindow();
+    deleted->unref();
     scheduleRearrange();
-    delete this;
+    unref();
 }
 
 void LayerShellV1Window::closeWindow()

src/unmanaged.cpp

@@ -155,9 +155,9 @@ void Unmanaged::release(ReleaseReason releaseReason)
     workspace()->removeUnmanaged(this);
     if (releaseReason != ReleaseReason::KWinShutsDown) {
         disownDataPassedToDeleted();
-        del->unrefWindow();
+        del->unref();
     }
-    deleteUnmanaged(this);
+    unref();
 }
 
 void Unmanaged::deleteUnmanaged(Unmanaged *c)

src/window.cpp

@@ -130,6 +130,19 @@ Window::~Window()
     delete info;
 }
 
+void Window::ref()
+{
+    ++m_refCount;
+}
+
+void Window::unref()
+{
+    --m_refCount;
+    if (m_refCount == 0) {
+        delete this;
+    }
+}
+
 QDebug operator<<(QDebug debug, const Window *window)
 {
     QDebugStateSaver saver(debug);

src/window.h

@@ -562,6 +562,9 @@ class KWIN_EXPORT Window : public QObject
 public:
     ~Window() override;
 
+    void ref();
+    void unref();
+
     virtual xcb_window_t frameId() const;
     xcb_window_t window() const;
     /**
@@ -1866,6 +1869,7 @@ private:
     void maybeSendFrameCallback();
 
     // when adding new data members, check also copyToDeleted()
+    int m_refCount = 1;
     QUuid m_internalId;
     Xcb::Window m_client;
     bool is_shape;

src/x11window.cpp

@@ -415,9 +415,9 @@ void X11Window::releaseWindow(bool on_shutdown)
     unblockGeometryUpdates(); // Don't use GeometryUpdatesBlocker, it would now set the geometry
     if (!on_shutdown) {
         disownDataPassedToDeleted();
-        del->unrefWindow();
+        del->unref();
     }
-    deleteClient(this);
+    unref();
     ungrabXServer();
 }
 
@@ -453,8 +453,8 @@ void X11Window::destroyWindow()
     m_frame.reset();
     unblockGeometryUpdates(); // Don't use GeometryUpdatesBlocker, it would now set the geometry
     disownDataPassedToDeleted();
-    del->unrefWindow();
-    deleteClient(this);
+    del->unref();
+    unref();
 }
 
 /**

src/xdgshellwindow.cpp

@@ -302,8 +302,8 @@ void XdgSurfaceWindow::destroyWindow()
     setDecoration(nullptr);
     cleanGrouping();
     waylandServer()->removeWindow(this);
-    deleted->unrefWindow();
-    delete this;
+    deleted->unref();
+    unref();
 }
 
 void XdgSurfaceWindow::updateClientArea()