update3dRenderingContext is 13.5% of GraphicsLayerUpdater::rebuildTree

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 173 matching lines @@
 
     void updateLayerPositionsAfterLayout(const RenderLayer* rootLayer, UpdateLayerPositionsFlags);
 
     void updateLayerPositionsAfterOverflowScroll();
     void updateLayerPositionsAfterDocumentScroll();
 
     bool isPaginated() const { return m_isPaginated; }
     RenderLayer* enclosingPaginationLayer() const { return m_enclosingPaginationLayer; }
 
     void updateTransform();
-    void update3dRenderingContext();
-    RenderLayer* renderingContextRoot() const { return m_3dRenderingContextRoot; }
+    RenderLayer* renderingContextRoot();
 
     const LayoutSize& offsetForInFlowPosition() const { return m_offsetForInFlowPosition; }
 
     void addBlockSelectionGapsBounds(const LayoutRect&);
     void clearBlockSelectionGapsBounds();
     void repaintBlockSelectionGaps();
     bool hasBlockSelectionGapBounds() const;
 
     RenderLayerStackingNode* stackingNode() { return m_stackingNode.get(); }
     const RenderLayerStackingNode* stackingNode() const { return m_stackingNode.get(); }
@@ skipping 124 matching lines @@
 
     // Get the perspective transform, which is applied to transformed sublayers.
     // Returns true if the layer has a -webkit-perspective.
     // Note that this transform has the perspective-origin baked in.
     TransformationMatrix perspectiveTransform() const;
     FloatPoint perspectiveOrigin() const;
     bool preserves3D() const { return renderer()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
     bool has3DTransform() const { return m_transform && !m_transform->isAffine(); }
 
     // FIXME: reflections should force transform-style to be flat in the style: https://bugs.webkit.org/show_bug.cgi?id=106959
-    bool shouldFlattenTransform() const { return renderer()->hasReflection() || !renderer()->style() || renderer()->style()->transformStyle3D() != TransformStyle3DPreserve3D; }
+    bool shouldPreserve3D() const { return !renderer()->hasReflection() && renderer()->style()->transformStyle3D() == TransformStyle3DPreserve3D; }
 
     void filterNeedsRepaint();
     bool hasFilter() const { return renderer()->hasFilter(); }
 
     bool paintsWithBlendMode() const;
 
     void* operator new(size_t);
     // Only safe to call from RenderLayerModelObject::destroyLayer()
     void operator delete(void*);
 
@@ skipping 386 matching lines @@
     LayoutUnit m_staticInlinePosition;
     LayoutUnit m_staticBlockPosition;
 
     IntRect m_absoluteBoundingBox;
 
     OwnPtr<TransformationMatrix> m_transform;
 
     // Pointer to the enclosing RenderLayer that caused us to be paginated. It is 0 if we are not paginated.
     RenderLayer* m_enclosingPaginationLayer;
 
-    // Pointer to the enclosing RenderLayer that establishes the 3d rendering context in which this layer participates.
-    // If it 0, it does not participate in a 3d rendering context.
-    RenderLayer* m_3dRenderingContextRoot;
-
     // Properties that are computed while updating compositing layers. These values may be dirty/invalid if
     // compositing status is not up-to-date before using them.
     struct CompositingProperties {
         CompositingProperties()
             : hasCompositingDescendant(false)
             , hasNonCompositedChild(false)
             , shouldIsolateCompositedDescendants(false)
             , lostGroupedMapping(false)
             , viewportConstrainedNotCompositedReason(NoNotCompositedReason)
             , compositingReasons(CompositingReasonNone)
@@ skipping 43 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