text: /*
   * Copyright (C) 2013 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:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * 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.
   *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
   * OWNER OR 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 ImageQualityController_h
  #define ImageQualityController_h
  
  #include "core/rendering/RenderObject.h"
  #include "platform/geometry/IntSize.h"
  #include "platform/geometry/LayoutSize.h"
  #include "platform/graphics/Image.h"
  #include "platform/graphics/ImageOrientation.h"
  #include "platform/graphics/ImageSource.h"
  #include "wtf/HashMap.h"
  
  namespace blink {
  
  typedef HashMap<const void*, LayoutSize> LayerSizeMap;
  typedef HashMap<RenderObject*, LayerSizeMap> ObjectLayerSizeMap;
  
  class ImageQualityController final {
      WTF_MAKE_NONCOPYABLE(ImageQualityController); WTF_MAKE_FAST_ALLOCATED;
  public:
      ~ImageQualityController();
  
      static ImageQualityController* imageQualityController();
  
      static void remove(RenderObject*);
  
      InterpolationQuality chooseInterpolationQuality(GraphicsContext*, RenderObject*, Image*, const void* layer, const LayoutSize&);
  
      // For testing.
      static bool has(RenderObject*);
      // This is public for testing. Do not call this from other classes.
      void set(RenderObject*, LayerSizeMap* innerMap, const void* layer, const LayoutSize&);
  
  private:
      ImageQualityController();
  
      bool shouldPaintAtLowQuality(GraphicsContext*, RenderObject*, Image*, const void* layer, const LayoutSize&);
      void removeLayer(RenderObject*, LayerSizeMap* innerMap, const void* layer);
      void objectDestroyed(RenderObject*);
      bool isEmpty() { return m_objectLayerSizeMap.isEmpty(); }
  
      void highQualityRepaintTimerFired(Timer<ImageQualityController>*);
      void restartTimer();
  
      ObjectLayerSizeMap m_objectLayerSizeMap;
      Timer<ImageQualityController> m_timer;
      bool m_animatedResizeIsActive;
      bool m_liveResizeOptimizationIsActive;
  };
  
  } // namespace blink
  
  #endif
  