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
42namespace blink {
43
44typedef HashMap<const void*, LayoutSize> LayerSizeMap;
45typedef HashMap<RenderObject*, LayerSizeMap> ObjectLayerSizeMap;
46
47class ImageQualityController FINAL {
48    WTF_MAKE_NONCOPYABLE(ImageQualityController); WTF_MAKE_FAST_ALLOCATED;
49public:
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
63private:
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