1 files changed, 3 insertions, 4 deletions
diff --git a/src/widgets/kernel/qwidgetbackingstore_p.h b/src/widgets/kernel/qwidgetbackingstore_p.h
index 4d15ab138e..9409ba7832 100644
--- a/src/widgets/kernel/qwidgetbackingstore_p.h
+++ b/src/widgets/kernel/qwidgetbackingstore_p.h
@@ -109,7 +109,7 @@ public:
 
     void sync(QWidget *exposedWidget, const QRegion &exposedRegion);
     void sync();
-    void flush(QWidget *widget = 0);
+    void flush(QWidget *widget = nullptr);
 
     QBackingStore *backingStore() const { return store; }
 
@@ -149,14 +149,13 @@ private:
 
     void doSync();
     bool bltRect(const QRect &rect, int dx, int dy, QWidget *widget);
-    void releaseBuffer();
 
     void beginPaint(QRegion &toClean, QWidget *widget, QBackingStore *backingStore,
                     BeginPaintInfo *returnInfo, bool toCleanIsInTopLevelCoordinates = true);
     void endPaint(const QRegion &cleaned, QBackingStore *backingStore, BeginPaintInfo *beginPaintInfo);
 
-    QRegion dirtyRegion(QWidget *widget = 0) const;
-    QRegion staticContents(QWidget *widget = 0, const QRect &withinClipRect = QRect()) const;
+    QRegion dirtyRegion(QWidget *widget = nullptr) const;
+    QRegion staticContents(QWidget *widget = nullptr, const QRect &withinClipRect = QRect()) const;
 
     void markDirtyOnScreen(const QRegion &dirtyOnScreen, QWidget *widget, const QPoint &topLevelOffset);