1/*
2 * Copyright (C) 2013 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef ImageQualityController_h
27#define ImageQualityController_h
28
29#include "Timer.h"
30#include <wtf/HashMap.h>
31
32namespace WebCore {
33
34class Frame;
35class GraphicsContext;
36class Image;
37class LayoutSize;
38class RenderBoxModelObject;
39class RenderView;
40
41class ImageQualityController {
42    WTF_MAKE_NONCOPYABLE(ImageQualityController)
43public:
44    explicit ImageQualityController(const RenderView&);
45
46    bool shouldPaintAtLowQuality(GraphicsContext*, RenderBoxModelObject*, Image*, const void* layer, const LayoutSize&);
47    void rendererWillBeDestroyed(RenderBoxModelObject& renderer) { removeObject(&renderer); }
48
49private:
50    typedef HashMap<const void*, LayoutSize> LayerSizeMap;
51    typedef HashMap<RenderBoxModelObject*, LayerSizeMap> ObjectLayerSizeMap;
52
53    void removeLayer(RenderBoxModelObject*, LayerSizeMap* innerMap, const void* layer);
54    void set(RenderBoxModelObject*, LayerSizeMap* innerMap, const void* layer, const LayoutSize&);
55    void highQualityRepaintTimerFired(Timer<ImageQualityController>&);
56    void restartTimer();
57    void removeObject(RenderBoxModelObject*);
58
59    const RenderView& m_renderView;
60    ObjectLayerSizeMap m_objectLayerSizeMap;
61    Timer<ImageQualityController> m_timer;
62    bool m_animatedResizeIsActive;
63    bool m_liveResizeOptimizationIsActive;
64};
65
66} // namespace
67
68#endif
69