Simplify RenderLayer::setParent

Source/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 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 1386 matching lines @@
     } else
         setFirstChild(child);
 
     if (beforeChild) {
         beforeChild->setPreviousSibling(child);
         child->setNextSibling(beforeChild);
         ASSERT(beforeChild != child);
     } else
         setLastChild(child);
 
-    child->setParent(this);
+    child->m_parent = this;
 
     setNeedsToUpdateAncestorDependentProperties();
 
     if (child->stackingNode()->isNormalFlowOnly())
         m_stackingNode->dirtyNormalFlowList();
 
     if (!child->stackingNode()->isNormalFlowOnly() || child->firstChild()) {
         // Dirty the z-order list in which we are contained. The ancestorStackingContainerNode() can be null in the
         // case where we're building up generated content layers. This is ok, since the lists will start
         // off dirty in that case anyway.
@@ skipping 50 matching lines @@
         // reattachment process in removeOnlyThisLayer, the layer may already be disconnected
         // from the main layer tree, so we need to null-check the |stackingContainer| value.
         oldChild->stackingNode()->dirtyStackingContainerZOrderLists();
     }
 
     if (renderer()->style()->visibility() != VISIBLE)
         dirtyVisibleContentStatus();
 
     oldChild->setPreviousSibling(0);
     oldChild->setNextSibling(0);
-    oldChild->setParent(0);
+    oldChild->m_parent = 0;
 
     oldChild->updateDescendantDependentFlags();
     if (subtreeContainsOutOfFlowPositionedLayer(oldChild)) {
         // It may now be the case that a layer no longer has an unclipped
         // descendant. Let the compositor know that it needs to reevaluate
         // its compositing requirements to check this.
         compositor()->setNeedsUpdateCompositingRequirementsState();
         dirtyAncestorChainHasOutOfFlowPositionedDescendantStatus();
     }
 
@@ skipping 2116 matching lines @@
         LayoutRect childLocalRect(localRect);
         childLayer->convertToLayerCoords(this, childOffset);
         childLocalRect.moveBy(-childOffset);
 
         if (childLayer->backgroundIsKnownToBeOpaqueInRect(childLocalRect))
             return true;
     }
     return false;
 }
 
-void RenderLayer::setParent(RenderLayer* parent)
-{
-    if (parent == m_parent)
-        return;
-
-    if (m_parent && !renderer()->documentBeingDestroyed())
-        compositor()->layerWillBeRemoved(m_parent, this);
-
-    m_parent = parent;
-
-    if (m_parent && !renderer()->documentBeingDestroyed())
-        compositor()->layerWasAdded(m_parent, this);
-}
-
 bool RenderLayer::shouldBeSelfPaintingLayer() const
 {
     return m_layerType == NormalLayer
         || (m_scrollableArea && m_scrollableArea->hasOverlayScrollbars())
         || needsCompositedScrolling();
 }
 
 void RenderLayer::updateSelfPaintingLayer()
 {
     bool isSelfPaintingLayer = this->shouldBeSelfPaintingLayer();
@@ skipping 385 matching lines @@
     }
 }
 
 void showLayerTree(const WebCore::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif