1 files changed, 5 insertions, 0 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.h b/src/plugins/platforms/cocoa/qcocoabackingstore.h
index 9be6814ae7..a874936ce6 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.h
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.h
@@ -54,6 +54,8 @@ class QCocoaBackingStore : public QRasterBackingStore
 protected:
     QCocoaBackingStore(QWindow *window);
     QCFType<CGColorSpaceRef> colorSpace() const;
+    QMacNotificationObserver m_backingPropertiesObserver;
+    virtual void backingPropertiesChanged() = 0;
 };
 
 class QNSWindowBackingStore : public QCocoaBackingStore
@@ -69,6 +71,7 @@ private:
     bool windowHasUnifiedToolbar() const;
     QImage::Format format() const override;
     void redrawRoundedBottomCorners(CGRect) const;
+    void backingPropertiesChanged() override;
 };
 
 class QCALayerBackingStore : public QCocoaBackingStore
@@ -115,6 +118,8 @@ private:
     bool recreateBackBufferIfNeeded();
     bool prepareForFlush();
 
+    void backingPropertiesChanged() override;
+
     std::list<std::unique_ptr<GraphicsBuffer>> m_buffers;
 };