Compute style-determined compositing reasons during recalc style

Source/core/rendering/RenderLayer.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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>
@@ skipping 460 matching lines @@
     PassOwnPtr<Vector<FloatRect> > collectTrackedRepaintRects() const;
 
     RenderLayerBlendInfo& blendInfo() { return m_blendInfo; }
 
     void setOffsetFromSquashingLayerOrigin(IntSize offset) { m_compositingProperties.offsetFromSquashingLayerOrigin = offset; }
     IntSize offsetFromSquashingLayerOrigin() const { return m_compositingProperties.offsetFromSquashingLayerOrigin; }
 
     bool scrollsOverflow() const;
 
     bool hasDirectReasonsForCompositing() const { return compositingReasons() & CompositingReasonComboAllDirectReasons; }
+    CompositingReasons styleDeterminedCompositingReasons() const { return compositingReasons() & CompositingReasonComboAllStyleDeterminedReasons; }
 
 private:
     bool hasOverflowControls() const;
 
     void setIsUnclippedDescendant(bool isUnclippedDescendant) { m_isUnclippedDescendant = isUnclippedDescendant; }
 
     void setAncestorChainHasSelfPaintingLayerDescendant();
     void dirtyAncestorChainHasSelfPaintingLayerDescendantStatus();
 
     void setAncestorChainHasOutOfFlowPositionedDescendant();
@@ skipping 80 matching lines @@
 
     bool hitTestContents(const HitTestRequest&, HitTestResult&, const LayoutRect& layerBounds, const HitTestLocation&, HitTestFilter) const;
     bool hitTestContentsForFragments(const LayerFragments&, const HitTestRequest&, HitTestResult&, const HitTestLocation&, HitTestFilter, bool& insideClipRect) const;
     RenderLayer* hitTestTransformedLayerInFragments(RenderLayer* rootLayer, RenderLayer* containerLayer, const HitTestRequest&, HitTestResult&,
         const LayoutRect& hitTestRect, const HitTestLocation&, const HitTestingTransformState* = 0, double* zOffset = 0);
 
     bool childBackgroundIsKnownToBeOpaqueInRect(const LayoutRect&) const;
 
     bool shouldBeSelfPaintingLayer() const;
 
+
 private:
     // FIXME: We should only create the stacking node if needed.
     bool requiresStackingNode() const { return true; }
     void updateStackingNode();
 
     void updateReflectionInfo(const RenderStyle*);
 
     // FIXME: We could lazily allocate our ScrollableArea based on style properties ('overflow', ...)
     // but for now, we are always allocating it for RenderBox as it's safer.
     bool requiresScrollableArea() const { return renderBox(); }
@@ skipping 25 matching lines @@
 
     bool hasNonCompositedChild() const { return m_compositingProperties.hasNonCompositedChild; }
     void setHasNonCompositedChild(bool b)  { m_compositingProperties.hasNonCompositedChild = b; }
 
     bool shouldIsolateCompositedDescendants() const { return m_compositingProperties.shouldIsolateCompositedDescendants; }
     void setShouldIsolateCompositedDescendants(bool b)  { m_compositingProperties.shouldIsolateCompositedDescendants = b; }
 
     bool lostGroupedMapping() const { return m_compositingProperties.lostGroupedMapping; }
     void setLostGroupedMapping(bool b) { m_compositingProperties.lostGroupedMapping = b; }
 
-    void setCompositingReasons(CompositingReasons);
     CompositingReasons compositingReasons() const { return m_compositingProperties.compositingReasons; }
+    void setCompositingReasons(CompositingReasons, CompositingReasons mask = CompositingReasonAll);
 
     friend class CompositedLayerMapping;
     friend class RenderLayerCompositor;
     friend class RenderLayerModelObject;
 
 private:
     LayerType m_layerType;
 
     // Self-painting layer is an optimization where we avoid the heavy RenderLayer painting
     // machinery for a RenderLayer allocated only to handle the overflow clip case.
@@ skipping 129 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