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      1 /*
      2  Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      3 
      4  This library is free software; you can redistribute it and/or
      5  modify it under the terms of the GNU Library General Public
      6  License as published by the Free Software Foundation; either
      7  version 2 of the License, or (at your option) any later version.
      8 
      9  This library is distributed in the hope that it will be useful,
     10  but WITHOUT ANY WARRANTY; without even the implied warranty of
     11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     12  Library General Public License for more details.
     13 
     14  You should have received a copy of the GNU Library General Public License
     15  along with this library; see the file COPYING.LIB.  If not, write to
     16  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     17  Boston, MA 02110-1301, USA.
     18  */
     19 
     20 #ifndef Tile_h
     21 #define Tile_h
     22 
     23 #if ENABLE(TILED_BACKING_STORE)
     24 
     25 #include "IntPoint.h"
     26 #include "IntPointHash.h"
     27 #include "IntRect.h"
     28 #include <wtf/PassRefPtr.h>
     29 #include <wtf/RefCounted.h>
     30 
     31 #if PLATFORM(QT)
     32 QT_BEGIN_NAMESPACE
     33 class QPixmap;
     34 class QRegion;
     35 QT_END_NAMESPACE
     36 #endif
     37 
     38 namespace WebCore {
     39 
     40 class GraphicsContext;
     41 class TiledBackingStore;
     42 
     43 class Tile : public RefCounted<Tile> {
     44 public:
     45     typedef IntPoint Coordinate;
     46 
     47     static PassRefPtr<Tile> create(TiledBackingStore* backingStore, const Coordinate& tileCoordinate) { return adoptRef(new Tile(backingStore, tileCoordinate)); }
     48     ~Tile();
     49 
     50     bool isDirty() const;
     51     void invalidate(const IntRect&);
     52     Vector<IntRect> updateBackBuffer();
     53     void swapBackBufferToFront();
     54     bool isReadyToPaint() const;
     55     void paint(GraphicsContext*, const IntRect&);
     56 
     57     const Tile::Coordinate& coordinate() const { return m_coordinate; }
     58     const IntRect& rect() const { return m_rect; }
     59 
     60     static void paintCheckerPattern(GraphicsContext*, const FloatRect&);
     61 
     62 private:
     63     Tile(TiledBackingStore*, const Coordinate&);
     64 
     65     TiledBackingStore* m_backingStore;
     66     Coordinate m_coordinate;
     67     IntRect m_rect;
     68 
     69 #if PLATFORM(QT)
     70     QPixmap* m_buffer;
     71     QPixmap* m_backBuffer;
     72     QRegion* m_dirtyRegion;
     73 #endif
     74 };
     75 
     76 }
     77 #endif
     78 #endif
     79