text: /*
   * Copyright (C) 2012, 2015 Apple 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
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
   *     its contributors may be used to endorse or promote products derived
   *     from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
   * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include "InspectorWebAgentBase.h"
  #include <JavaScriptCore/InspectorBackendDispatchers.h>
  #include <JavaScriptCore/InspectorFrontendDispatchers.h>
  #include <JavaScriptCore/InspectorProtocolObjects.h>
  #include <wtf/text/WTFString.h>
  
  namespace WebCore {
  
  class IntRect;
  class Node;
  class PseudoElement;
  class RenderElement;
  class RenderLayer;
  
  class InspectorLayerTreeAgent final : public InspectorAgentBase, public Inspector::LayerTreeBackendDispatcherHandler {
      WTF_MAKE_NONCOPYABLE(InspectorLayerTreeAgent);
      WTF_MAKE_FAST_ALLOCATED;
  public:
      InspectorLayerTreeAgent(WebAgentContext&);
      ~InspectorLayerTreeAgent();
  
      // InspectorAgentBase
      void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*);
      void willDestroyFrontendAndBackend(Inspector::DisconnectReason);
  
      // LayerTreeBackendDispatcherHandler
      Inspector::Protocol::ErrorStringOr<void> enable();
      Inspector::Protocol::ErrorStringOr<void> disable();
      Inspector::Protocol::ErrorStringOr<Ref<JSON::ArrayOf<Inspector::Protocol::LayerTree::Layer>>> layersForNode(Inspector::Protocol::DOM::NodeId);
      Inspector::Protocol::ErrorStringOr<Ref<Inspector::Protocol::LayerTree::CompositingReasons>> reasonsForCompositingLayer(const Inspector::Protocol::LayerTree::LayerId&);
  
      // InspectorInstrumentation
      void layerTreeDidChange();
      void renderLayerDestroyed(const RenderLayer&);
      void pseudoElementDestroyed(PseudoElement&);
      void reset();
  
  private:
      // RenderLayer-related methods.
      String bind(const RenderLayer*);
      void unbind(const RenderLayer*);
  
      void gatherLayersUsingRenderObjectHierarchy(RenderElement&, JSON::ArrayOf<Inspector::Protocol::LayerTree::Layer>&);
      void gatherLayersUsingRenderLayerHierarchy(RenderLayer*, JSON::ArrayOf<Inspector::Protocol::LayerTree::Layer>&);
  
      Ref<Inspector::Protocol::LayerTree::Layer> buildObjectForLayer(RenderLayer*);
      Ref<Inspector::Protocol::LayerTree::IntRect> buildObjectForIntRect(const IntRect&);
  
      Inspector::Protocol::DOM::NodeId idForNode(Node*);
  
      String bindPseudoElement(PseudoElement*);
      void unbindPseudoElement(PseudoElement*);
  
      std::unique_ptr<Inspector::LayerTreeFrontendDispatcher> m_frontendDispatcher;
      RefPtr<Inspector::LayerTreeBackendDispatcher> m_backendDispatcher;
  
      HashMap<const RenderLayer*, Inspector::Protocol::LayerTree::LayerId> m_documentLayerToIdMap;
      HashMap<Inspector::Protocol::LayerTree::LayerId, const RenderLayer*> m_idToLayer;
  
      HashMap<PseudoElement*, Inspector::Protocol::LayerTree::PseudoElementId> m_pseudoElementToIdMap;
      HashMap<Inspector::Protocol::LayerTree::PseudoElementId, PseudoElement*> m_idToPseudoElement;
  
      bool m_suppressLayerChangeEvents { false };
  };
  
  } // namespace WebCore
  