Merge WebKit at r75315: Initial merge by git.

Change-Id: I570314b346ce101c935ed22a626b48c2af266b84

1 files changed, 127 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/TiledBackingStore.h b/Source/WebCore/platform/graphics/TiledBackingStore.h
new file mode 100644
index 0000000..58477db
--- /dev/null
+++ b/Source/WebCore/platform/graphics/TiledBackingStore.h
@@ -0,0 +1,127 @@
+/*
+ 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 TiledBackingStore_h
+#define TiledBackingStore_h
+
+#if ENABLE(TILED_BACKING_STORE)
+
+#include "FloatSize.h"
+#include "IntPoint.h"
+#include "IntRect.h"
+#include "Tile.h"
+#include "Timer.h"
+#include <wtf/Assertions.h>
+#include <wtf/HashMap.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class GraphicsContext;
+class TiledBackingStoreClient;
+
+class TiledBackingStore : public Noncopyable {
+public:
+    TiledBackingStore(TiledBackingStoreClient*);
+    ~TiledBackingStore();
+
+    void adjustVisibleRect();
+    
+    float contentsScale() { return m_contentsScale; }
+    void setContentsScale(float);
+    
+    bool contentsFrozen() const { return m_contentsFrozen; }
+    void setContentsFrozen(bool);
+
+    void invalidate(const IntRect& dirtyRect);
+    void paint(GraphicsContext*, const IntRect&);
+    
+    IntSize tileSize() { return m_tileSize; }
+    void setTileSize(const IntSize&);
+    
+    double tileCreationDelay() const { return m_tileCreationDelay; }
+    void setTileCreationDelay(double delay);
+    
+    // Tiled are dropped outside the keep area, and created for cover area. The values a relative to the viewport size.
+    void getKeepAndCoverAreaMultipliers(FloatSize& keepMultiplier, FloatSize& coverMultiplier)
+    {
+        keepMultiplier = m_keepAreaMultiplier;
+        coverMultiplier = m_coverAreaMultiplier;
+    }
+    void setKeepAndCoverAreaMultipliers(const FloatSize& keepMultiplier, const FloatSize& coverMultiplier);    
+
+private:
+    void startTileBufferUpdateTimer();
+    void startTileCreationTimer();
+    
+    typedef Timer<TiledBackingStore> TileTimer;
+
+    void tileBufferUpdateTimerFired(TileTimer*);
+    void tileCreationTimerFired(TileTimer*);
+    
+    void updateTileBuffers();
+    void createTiles();
+    
+    void commitScaleChange();
+
+    void dropOverhangingTiles();
+    void dropTilesOutsideRect(const IntRect&);
+    
+    PassRefPtr<Tile> tileAt(const Tile::Coordinate&) const;
+    void setTile(const Tile::Coordinate& coordinate, PassRefPtr<Tile> tile);
+    void removeTile(const Tile::Coordinate& coordinate);
+
+    IntRect mapToContents(const IntRect&) const;
+    IntRect mapFromContents(const IntRect&) const;
+    
+    IntRect contentsRect() const;
+    
+    IntRect tileRectForCoordinate(const Tile::Coordinate&) const;
+    Tile::Coordinate tileCoordinateForPoint(const IntPoint&) const;
+    double tileDistance(const IntRect& viewport, const Tile::Coordinate&);
+    
+    void paintCheckerPattern(GraphicsContext*, const IntRect&, const Tile::Coordinate&);
+
+private:
+    TiledBackingStoreClient* m_client;
+
+    typedef HashMap<Tile::Coordinate, RefPtr<Tile> > TileMap;
+    TileMap m_tiles;
+
+    TileTimer* m_tileBufferUpdateTimer;
+    TileTimer* m_tileCreationTimer;
+
+    IntSize m_tileSize;
+    double m_tileCreationDelay;
+    FloatSize m_keepAreaMultiplier;
+    FloatSize m_coverAreaMultiplier;
+    
+    IntRect m_previousVisibleRect;
+    float m_contentsScale;
+    float m_pendingScale;
+
+    bool m_contentsFrozen;
+
+    friend class Tile;
+};
+
+}
+
+#endif
+#endif