1/*
2 Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
3 Copyright (C) 2012 Company 100, Inc.
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public License
16 along with this library; see the file COPYING.LIB.  If not, write to
17 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19 */
20
21#ifndef UpdateAtlas_h
22#define UpdateAtlas_h
23
24#include "AreaAllocator.h"
25#include "CoordinatedSurface.h"
26#include "IntSize.h"
27
28#if USE(COORDINATED_GRAPHICS)
29
30namespace WebCore {
31class GraphicsContext;
32class IntPoint;
33
34class UpdateAtlas {
35    WTF_MAKE_NONCOPYABLE(UpdateAtlas);
36public:
37    class Client {
38    public:
39        virtual void createUpdateAtlas(uint32_t /* id */, PassRefPtr<CoordinatedSurface>) = 0;
40        virtual void removeUpdateAtlas(uint32_t /* id */) = 0;
41    };
42
43    UpdateAtlas(Client*, int dimension, CoordinatedSurface::Flags);
44    ~UpdateAtlas();
45
46    inline IntSize size() const { return m_surface->size(); }
47
48    // Returns false if there is no available buffer.
49    bool paintOnAvailableBuffer(const IntSize&, uint32_t& atlasID, IntPoint& offset, CoordinatedSurface::Client*);
50    void didSwapBuffers();
51    bool supportsAlpha() const { return m_surface->supportsAlpha(); }
52
53    void addTimeInactive(double seconds)
54    {
55        ASSERT(!isInUse());
56        m_inactivityInSeconds += seconds;
57    }
58    bool isInactive() const
59    {
60        const double inactiveSecondsTolerance = 3;
61        return m_inactivityInSeconds > inactiveSecondsTolerance;
62    }
63    bool isInUse() const { return m_areaAllocator; }
64
65private:
66    void buildLayoutIfNeeded();
67
68private:
69    Client* m_client;
70    OwnPtr<GeneralAreaAllocator> m_areaAllocator;
71    RefPtr<CoordinatedSurface> m_surface;
72    double m_inactivityInSeconds;
73    uint32_t m_ID;
74};
75
76} // namespace WebCore
77#endif // USE(COORDINATED_GRAPHICS)
78#endif // UpdateAtlas_h
79