text: /*
   * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
   *
   * 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.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
   */
  
  #ifndef TiledDrawingArea_h
  #define TiledDrawingArea_h
  
  #if ENABLE(TILED_BACKING_STORE)
  
  #include "DrawingArea.h"
  #include "RunLoop.h"
  #include <WebCore/IntRect.h>
  #include <wtf/Vector.h>
  
  namespace WebKit {
  
  class UpdateChunk;
  
  class TiledDrawingArea : public DrawingArea {
  public:
      explicit TiledDrawingArea(WebPage*);
      virtual ~TiledDrawingArea();
  
      virtual void setNeedsDisplay(const WebCore::IntRect&);
      virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
      virtual void display();
  
  #if USE(ACCELERATED_COMPOSITING)
      virtual void attachCompositingContext() { }
      virtual void detachCompositingContext() { }
      virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
      virtual void scheduleCompositingLayerSync() { }
      virtual void syncCompositingLayers() { }
  #endif
  
      virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
  
  private:
      void scheduleDisplay();
  
      // CoreIPC message handlers.
      void setSize(const WebCore::IntSize& viewSize);
      void suspendPainting();
      void resumePainting();
      void didUpdate();
      void updateTile(int tileID, const WebCore::IntRect& dirtyRect, float scale);
  
      // Platform overrides
      void paintIntoUpdateChunk(UpdateChunk*, float scale);
  
      void tileUpdateTimerFired();
  
      WebCore::IntRect m_dirtyRect;
      bool m_isWaitingForUpdate;
      bool m_shouldPaint;
      RunLoop::Timer<TiledDrawingArea> m_displayTimer;
  
      struct TileUpdate {
          int tileID;
          WebCore::IntRect dirtyRect;
          float scale;
      };
      typedef HashMap<int, TileUpdate> UpdateMap;
      UpdateMap m_pendingUpdates;
      RunLoop::Timer<TiledDrawingArea> m_tileUpdateTimer;
  };
  
  } // namespace WebKit
  
  #endif // TILED_BACKING_STORE
  
  #endif // TiledDrawingArea_h
  