1 files changed, 4 insertions, 1 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoabackingstore.h b/src/plugins/platforms/cocoa/qcocoabackingstore.h
index 374dc97f7d..28adbaee41 100644
--- a/src/plugins/platforms/cocoa/qcocoabackingstore.h
+++ b/src/plugins/platforms/cocoa/qcocoabackingstore.h
@@ -85,7 +85,6 @@ private:
     bool eventFilter(QObject *watched, QEvent *event) override;
 
     QSize m_requestedSize;
-    QRegion m_paintedRegion;
 
     class GraphicsBuffer : public QIOSurfaceGraphicsBuffer
     {
@@ -96,12 +95,16 @@ private:
         QRegion dirtyRegion; // In unscaled coordinates
         QImage *asImage();
         qreal devicePixelRatio() const { return m_devicePixelRatio; }
+        bool isDirty() const { return !dirtyRegion.isEmpty(); }
+        QRegion validRegion() const;
 
     private:
         qreal m_devicePixelRatio;
         QImage m_image;
     };
 
+    void updateDirtyStates(const QRegion &paintedRegion);
+
     void ensureBackBuffer();
     bool recreateBackBufferIfNeeded();
     bool prepareForFlush();