Source/WebCore/platform/graphics/Tile.h

/*
 Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
 
 This library is free software; you can redistribute it and/or
 modify it under the terms of the GNU Library General Public
 License as published by the Free Software Foundation; either
 version 2 of the License, or (at your option) any later version.
 
 This library is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 Library General Public License for more details.
 
 You should have received a copy of the GNU Library General Public License
 along with this library; see the file COPYING.LIB.  If not, write to
 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 Boston, MA 02110-1301, USA.
 */

#ifndef Tile_h
#define Tile_h

#if ENABLE(TILED_BACKING_STORE)

#include "IntPoint.h"
#include "IntPointHash.h"
#include "IntRect.h"
#include <wtf/PassRefPtr.h>
#include <wtf/RefCounted.h>

#if PLATFORM(QT)
QT_BEGIN_NAMESPACE
class QPixmap;
class QRegion;
QT_END_NAMESPACE
#endif

namespace WebCore {
    
class GraphicsContext;
class TiledBackingStore;

class Tile : public RefCounted<Tile> {
public:
    typedef IntPoint Coordinate;

    static PassRefPtr<Tile> create(TiledBackingStore* backingStore, const Coordinate& tileCoordinate) { return adoptRef(new Tile(backingStore, tileCoordinate)); }
    ~Tile();
    
    bool isDirty() const;
    void invalidate(const IntRect&);
    void updateBackBuffer();
    void swapBackBufferToFront();
    bool isReadyToPaint() const;
    void paint(GraphicsContext*, const IntRect&);

    const Tile::Coordinate& coordinate() const { return m_coordinate; }
    const IntRect& rect() const { return m_rect; }
    
    static void paintCheckerPattern(GraphicsContext*, const FloatRect&);

private:
    Tile(TiledBackingStore*, const Coordinate&);
    
    TiledBackingStore* m_backingStore;
    Coordinate m_coordinate;
    IntRect m_rect;

#if PLATFORM(QT)
    QPixmap* m_buffer;
    QPixmap* m_backBuffer;
    QRegion* m_dirtyRegion;
#endif
};

}
#endif
#endif