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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #ifndef ImageQualityController_h
     32 #define ImageQualityController_h
     33 
     34 #include "core/rendering/RenderObject.h"
     35 #include "platform/geometry/IntSize.h"
     36 #include "platform/geometry/LayoutSize.h"
     37 #include "platform/graphics/Image.h"
     38 #include "platform/graphics/ImageOrientation.h"
     39 #include "platform/graphics/ImageSource.h"
     40 #include "wtf/HashMap.h"
     41 
     42 namespace blink {
     43 
     44 typedef HashMap<const void*, LayoutSize> LayerSizeMap;
     45 typedef HashMap<RenderObject*, LayerSizeMap> ObjectLayerSizeMap;
     46 
     47 class ImageQualityController FINAL {
     48     WTF_MAKE_NONCOPYABLE(ImageQualityController); WTF_MAKE_FAST_ALLOCATED;
     49 public:
     50     ~ImageQualityController();
     51 
     52     static ImageQualityController* imageQualityController();
     53 
     54     static void remove(RenderObject*);
     55 
     56     InterpolationQuality chooseInterpolationQuality(GraphicsContext*, RenderObject*, Image*, const void* layer, const LayoutSize&);
     57 
     58     // For testing.
     59     static bool has(RenderObject*);
     60     // This is public for testing. Do not call this from other classes.
     61     void set(RenderObject*, LayerSizeMap* innerMap, const void* layer, const LayoutSize&);
     62 
     63 private:
     64     ImageQualityController();
     65 
     66     bool shouldPaintAtLowQuality(GraphicsContext*, RenderObject*, Image*, const void* layer, const LayoutSize&);
     67     void removeLayer(RenderObject*, LayerSizeMap* innerMap, const void* layer);
     68     void objectDestroyed(RenderObject*);
     69     bool isEmpty() { return m_objectLayerSizeMap.isEmpty(); }
     70 
     71     void highQualityRepaintTimerFired(Timer<ImageQualityController>*);
     72     void restartTimer();
     73 
     74     ObjectLayerSizeMap m_objectLayerSizeMap;
     75     Timer<ImageQualityController> m_timer;
     76     bool m_animatedResizeIsActive;
     77     bool m_liveResizeOptimizationIsActive;
     78 };
     79 
     80 } // namespace blink
     81 
     82 #endif
     83