third_party/WebKit/Source/core/layout/ImageQualityController.h

   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/CoreExport.h"
  35 #include "core/layout/LayoutObject.h"
  36 #include "platform/geometry/IntSize.h"
  37 #include "platform/geometry/LayoutSize.h"
  38 #include "platform/graphics/Image.h"
  39 #include "platform/graphics/ImageOrientation.h"
  40 #include "platform/graphics/ImageSource.h"
  41 #include "wtf/HashMap.h"
  42
  43 namespace blink {
  44
  45 typedef HashMap<const void*, LayoutSize> LayerSizeMap;
  46 typedef HashMap<LayoutObject*, LayerSizeMap> ObjectLayerSizeMap;
  47
  48 class CORE_EXPORT ImageQualityController final {
  49     WTF_MAKE_NONCOPYABLE(ImageQualityController); WTF_MAKE_FAST_ALLOCATED(ImageQualityController);
  50 public:
  51     ~ImageQualityController();
  52
  53     static ImageQualityController* imageQualityController();
  54
  55     static void remove(LayoutObject*);
  56
  57     InterpolationQuality chooseInterpolationQuality(GraphicsContext*, LayoutObject*, Image*, const void* layer, const LayoutSize&);
  58
  59 private:
  60     ImageQualityController();
  61
  62     static bool has(LayoutObject*);
  63     void set(LayoutObject*, LayerSizeMap* innerMap, const void* layer, const LayoutSize&);
  64
  65     bool shouldPaintAtLowQuality(GraphicsContext*, LayoutObject*, Image*, const void* layer, const LayoutSize&);
  66     void removeLayer(LayoutObject*, LayerSizeMap* innerMap, const void* layer);
  67     void objectDestroyed(LayoutObject*);
  68     bool isEmpty() { return m_objectLayerSizeMap.isEmpty(); }
  69
  70     void highQualityRepaintTimerFired(Timer<ImageQualityController>*);
  71     void restartTimer();
  72
  73     // Only for use in testing.
  74     void setTimer(Timer<ImageQualityController>*);
  75
  76     ObjectLayerSizeMap m_objectLayerSizeMap;
  77     OwnPtr<Timer<ImageQualityController>> m_timer;
  78     bool m_animatedResizeIsActive;
  79     bool m_liveResizeOptimizationIsActive;
  80
  81     // For calling set().
  82     friend class LayoutPartTest_DestroyUpdatesImageQualityController_Test;
  83
  84     // For calling setTimer(),
  85     friend class ImageQualityControllerTest_LowQualityFilterForLiveResize_Test;
  86     friend class ImageQualityControllerTest_LowQualityFilterForResizingImage_Test;
  87     friend class ImageQualityControllerTest_DontKickTheAnimationTimerWhenPaintingAtTheSameSize_Test;
  88 };
  89
  90 } // namespace blink
  91
  92 #endif