Invalidate previous paint rect in RenderObject::paintInvalidationForWholeRenderer()

Source/core/rendering/RenderObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 971 matching lines @@
     // Compute a list of hit-test rectangles per layer rooted at this renderer.
     virtual void computeLayerHitTestRects(LayerHitTestRects&) const;
 
     // Return the renderer whose background style is used to paint the root background. Should only be called on the renderer for which isDocumentElement() is true.
     RenderObject* rendererForRootBackground();
 
     RespectImageOrientationEnum shouldRespectImageOrientation() const;
 
     bool isRelayoutBoundaryForInspector() const;
 
-    const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
-    void setPreviousPaintInvalidationRect(const LayoutRect& rect) { m_previousPaintInvalidationRect = rect; }
+    const LayoutRect& previousPaintInvalidationRect() const
+    {
+        ASSERT(savesPreviousPaintInvalidationRect());
+        return m_previousPaintInvalidationRect;
+    }
+    void setPreviousPaintInvalidationRect(const LayoutRect& rect)
+    {
+        ASSERT(savesPreviousPaintInvalidationRect());
+        m_previousPaintInvalidationRect = rect;
+    }
+    // For now only RenderBox and RenderSVGModelObject sets previousPaintInvalidationRect.
+    bool savesPreviousPaintInvalidationRect() const { return isBox() || isSVG(); }
 
     const LayoutPoint& previousPositionFromPaintInvalidationContainer() const { return m_previousPositionFromPaintInvalidationContainer; }
     void setPreviousPositionFromPaintInvalidationContainer(const LayoutPoint& location) { m_previousPositionFromPaintInvalidationContainer = location; }
 
     bool shouldDoFullPaintInvalidationAfterLayout() const { return m_bitfields.shouldDoFullPaintInvalidationAfterLayout(); }
     void setShouldDoFullPaintInvalidationAfterLayout(bool b) { m_bitfields.setShouldDoFullPaintInvalidationAfterLayout(b); }
     bool shouldInvalidateOverflowForPaint() const { return m_bitfields.shouldInvalidateOverflowForPaint(); }
 
     bool shouldDoFullPaintInvalidationIfSelfPaintingLayer() const { return m_bitfields.shouldDoFullPaintInvalidationIfSelfPaintingLayer(); }
     void setShouldDoFullPaintInvalidationIfSelfPaintingLayer(bool b) { m_bitfields.setShouldDoFullPaintInvalidationIfSelfPaintingLayer(b); }
@@ skipping 489 matching lines @@
 void showTree(const WebCore::RenderObject*);
 void showLineTree(const WebCore::RenderObject*);
 void showRenderTree(const WebCore::RenderObject* object1);
 // We don't make object2 an optional parameter so that showRenderTree
 // can be called from gdb easily.
 void showRenderTree(const WebCore::RenderObject* object1, const WebCore::RenderObject* object2);
 
 #endif
 
 #endif // RenderObject_h