Merge 99752 - REGRESSION (r93614): Content remains despite parent element being scrolled off page...

Source/WebCore/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 448 matching lines @@
     LayoutRect absoluteBoundingBox() const;
 
     void updateHoverActiveState(const HitTestRequest&, HitTestResult&);
 
     // WARNING: This method returns the offset for the parent as this is what updateLayerPositions expects.
     LayoutPoint computeOffsetFromRoot(bool& hasLayerOffset) const;
 
     // Return a cached repaint rect, computed relative to the layer renderer's containerForRepaint.
     LayoutRect repaintRect() const { return m_repaintRect; }
     LayoutRect repaintRectIncludingDescendants() const;
-    void updateLayerPositionsAfterScroll(bool fixed = false);
+
+    enum UpdateLayerPositionsAfterScrollFlag {
+        NoFlag = 0,
+        HasSeenFixedPositionedAncestor = 1 << 0,
+        HasSeenAncestorWithOverflowClip = 1 << 1
+    };
+
+    typedef unsigned UpdateLayerPositionsAfterScrollFlags;
+    void updateLayerPositionsAfterScroll(UpdateLayerPositionsAfterScrollFlags = NoFlag);
     void setNeedsFullRepaint(bool f = true) { m_needsFullRepaint = f; }
     
     LayoutUnit staticInlinePosition() const { return m_staticInlinePosition; }
     LayoutUnit staticBlockPosition() const { return m_staticBlockPosition; }
    
     void setStaticInlinePosition(LayoutUnit position) { m_staticInlinePosition = position; }
     void setStaticBlockPosition(LayoutUnit position) { m_staticBlockPosition = position; }
 
     bool hasTransform() const { return renderer()->hasTransform(); }
     // Note that this transform has the transform-origin baked in.
@@ skipping 248 matching lines @@
     bool m_3DTransformedDescendantStatusDirty : 1;
     bool m_has3DTransformedDescendant : 1;  // Set on a stacking context layer that has 3D descendants anywhere
                                             // in a preserves3D hierarchy. Hint to do 3D-aware hit testing.
 #if USE(ACCELERATED_COMPOSITING)
     bool m_hasCompositingDescendant : 1; // In the z-order tree.
     bool m_mustOverlapCompositedLayers : 1;
 #endif
 
     bool m_containsDirtyOverlayScrollbars : 1;
 
+    // This is an optimization added for <table>.
+    // Currently cells do not need to update their repaint rectangles when scrolling. This also
+    // saves a lot of time when scrolling on a table.
+    bool m_canSkipRepaintRectsUpdateOnScroll : 1;
+
     RenderBoxModelObject* m_renderer;
 
     RenderLayer* m_parent;
     RenderLayer* m_previous;
     RenderLayer* m_next;
     RenderLayer* m_first;
     RenderLayer* m_last;
 
     LayoutRect m_repaintRect; // Cached repaint rects. Used by layout.
     LayoutRect m_outlineBox;
@@ skipping 64 matching lines @@
 
 } // namespace WebCore
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showLayerTree(const WebCore::RenderLayer*);
 void showLayerTree(const WebCore::RenderObject*);
 #endif
 
 #endif // RenderLayer_h