Move GraphicsLayerUpdater::rebuildTree into its own file

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 18 matching lines @@
 
 #include "core/html/HTMLMediaElement.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderLayerReflectionInfo.h"
 #include "core/rendering/RenderPart.h"
 #include "core/rendering/compositing/CompositedLayerMapping.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
 
 namespace WebCore {
 
-static bool shouldAppendLayer(const RenderLayer& layer)
-{
-    if (!RuntimeEnabledFeatures::overlayFullscreenVideoEnabled())
-        return true;
-    Node* node = layer.renderer()->node();
-    if (node && isHTMLMediaElement(*node) && toHTMLMediaElement(node)->isFullscreen())
-        return false;
-    return true;
-}
-
 GraphicsLayerUpdater::UpdateContext::UpdateContext(const UpdateContext& other, const RenderLayer& layer)
     : m_compositingStackingContext(other.m_compositingStackingContext)
     , m_compositingAncestor(other.compositingContainer(layer))
 {
     CompositingState compositingState = layer.compositingState();
     if (compositingState != NotComposited && compositingState != PaintsIntoGroupedBacking) {
         m_compositingAncestor = &layer;
         if (layer.stackingNode()->isStackingContext())
             m_compositingStackingContext = &layer;
     }
 }
 
 const RenderLayer* GraphicsLayerUpdater::UpdateContext::compositingContainer(const RenderLayer& layer) const
 {
     return layer.stackingNode()->isNormalFlowOnly() ? m_compositingAncestor : m_compositingStackingContext;
 }
 
 GraphicsLayerUpdater::GraphicsLayerUpdater()
     : m_needsRebuildTree(false)
 {
 }
 
 GraphicsLayerUpdater::~GraphicsLayerUpdater()
 {
 }
 
-void GraphicsLayerUpdater::rebuildTree(RenderLayer& layer, GraphicsLayerVector& childLayersOfEnclosingLayer)
-{
-    // Make the layer compositing if necessary, and set up clipping and content layers.
-    // Note that we can only do work here that is independent of whether the descendant layers
-    // have been processed. computeCompositingRequirements() will already have done the repaint if necessary.
-
-    layer.stackingNode()->updateLayerListsIfNeeded();
-
-    const bool hasCompositedLayerMapping = layer.hasCompositedLayerMapping();
-    CompositedLayerMappingPtr currentCompositedLayerMapping = layer.compositedLayerMapping();
-
-    // If this layer has a compositedLayerMapping, then that is where we place subsequent children GraphicsLayers.
-    // Otherwise children continue to append to the child list of the enclosing layer.
-    GraphicsLayerVector layerChildren;
-    GraphicsLayerVector& childList = hasCompositedLayerMapping ? layerChildren : childLayersOfEnclosingLayer;
-
-#if !ASSERT_DISABLED
-    LayerListMutationDetector mutationChecker(layer.stackingNode());
-#endif
-
-    if (layer.stackingNode()->isStackingContext()) {
-        RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NegativeZOrderChildren);
-        while (RenderLayerStackingNode* curNode = iterator.next())
-            rebuildTree(*curNode->layer(), childList);
-
-        // If a negative z-order child is compositing, we get a foreground layer which needs to get parented.
-        if (hasCompositedLayerMapping && currentCompositedLayerMapping->foregroundLayer())
-            childList.append(currentCompositedLayerMapping->foregroundLayer());
-    }
-
-    RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
-    while (RenderLayerStackingNode* curNode = iterator.next())
-        rebuildTree(*curNode->layer(), childList);
-
-    if (hasCompositedLayerMapping) {
-        bool parented = false;
-        if (layer.renderer()->isRenderPart())
-            parented = RenderLayerCompositor::parentFrameContentLayers(toRenderPart(layer.renderer()));
-
-        if (!parented)
-            currentCompositedLayerMapping->parentForSublayers()->setChildren(layerChildren);
-
-        // If the layer has a clipping layer the overflow controls layers will be siblings of the clipping layer.
-        // Otherwise, the overflow control layers are normal children.
-        if (!currentCompositedLayerMapping->hasClippingLayer() && !currentCompositedLayerMapping->hasScrollingLayer()) {
-            if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForHorizontalScrollbar()) {
-                overflowControlLayer->removeFromParent();
-                currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
-            }
-
-            if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForVerticalScrollbar()) {
-                overflowControlLayer->removeFromParent();
-                currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
-            }
-
-            if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForScrollCorner()) {
-                overflowControlLayer->removeFromParent();
-                currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
-            }
-        }
-
-        if (shouldAppendLayer(layer))
-            childLayersOfEnclosingLayer.append(currentCompositedLayerMapping->childForSuperlayers());
-    }
-}
-
 void GraphicsLayerUpdater::update(RenderLayer& layer, UpdateType updateType, const UpdateContext& context)
 {
     if (layer.hasCompositedLayerMapping()) {
         CompositedLayerMappingPtr mapping = layer.compositedLayerMapping();
 
         const RenderLayer* compositingContainer = context.compositingContainer(layer);
         ASSERT(compositingContainer == layer.ancestorCompositingLayer());
         if (mapping->updateRequiresOwnBackingStoreForAncestorReasons(compositingContainer))
             updateType = ForceUpdate;
 
@@ skipping 33 matching lines @@
     if (layer.hasCompositedLayerMapping())
         layer.compositedLayerMapping()->assertNeedsToUpdateGraphicsLayerBitsCleared();
 
     for (RenderLayer* child = layer.firstChild(); child; child = child->nextSibling())
         assertNeedsToUpdateGraphicsLayerBitsCleared(*child);
 }
 
 #endif
 
 } // namespace WebCore