1/*
2Copyright (C) 2012 Google Inc. All rights reserved.
3
4Redistribution and use in source and binary forms, with or without
5modification, are permitted provided that the following conditions
6are met:
71.  Redistributions of source code must retain the above copyright
8    notice, this list of conditions and the following disclaimer.
92.  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
13THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23*/
24
25#ifndef Canvas2DLayerManager_h
26#define Canvas2DLayerManager_h
27
28#include "platform/graphics/Canvas2DLayerBridge.h"
29#include "public/platform/WebThread.h"
30
31class Canvas2DLayerManagerTest;
32
33namespace blink {
34
35class PLATFORM_EXPORT Canvas2DLayerManager : public WebThread::TaskObserver {
36public:
37    static Canvas2DLayerManager& get();
38
39    void init(size_t maxBytesAllocated, size_t targetBytesAllocated);
40    virtual ~Canvas2DLayerManager();
41
42    void layerTransientResourceAllocationChanged(Canvas2DLayerBridge*, intptr_t deltaBytes = 0);
43    void layerDidDraw(Canvas2DLayerBridge*);
44
45    bool isInList(Canvas2DLayerBridge*) const;
46private:
47    Canvas2DLayerManager();
48
49    // internal methods
50    void freeMemoryIfNecessary();
51    void addLayerToList(Canvas2DLayerBridge*);
52    virtual void willProcessTask() OVERRIDE;
53    virtual void didProcessTask() OVERRIDE;
54
55    size_t m_bytesAllocated;
56    size_t m_maxBytesAllocated;
57    size_t m_targetBytesAllocated;
58    bool m_taskObserverActive;
59    DoublyLinkedList<Canvas2DLayerBridge> m_layerList;
60
61    friend class ::Canvas2DLayerManagerTest; // for unit testing
62};
63
64} // namespace blink
65
66#endif
67
68