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      1 /*
      2  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. 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  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     23  * THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #ifndef TiledDrawingArea_h
     27 #define TiledDrawingArea_h
     28 
     29 #if ENABLE(TILED_BACKING_STORE)
     30 
     31 #include "DrawingArea.h"
     32 #include "RunLoop.h"
     33 #include <WebCore/IntRect.h>
     34 #include <wtf/Vector.h>
     35 
     36 namespace WebKit {
     37 
     38 class UpdateChunk;
     39 
     40 class TiledDrawingArea : public DrawingArea {
     41 public:
     42     explicit TiledDrawingArea(WebPage*);
     43     virtual ~TiledDrawingArea();
     44 
     45     virtual void setNeedsDisplay(const WebCore::IntRect&);
     46     virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
     47     virtual void display();
     48 
     49 #if USE(ACCELERATED_COMPOSITING)
     50     virtual void attachCompositingContext() { }
     51     virtual void detachCompositingContext() { }
     52     virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
     53     virtual void scheduleCompositingLayerSync() { }
     54     virtual void syncCompositingLayers() { }
     55 #endif
     56 
     57     virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
     58 
     59 private:
     60     void scheduleDisplay();
     61 
     62     // CoreIPC message handlers.
     63     void setSize(const WebCore::IntSize& viewSize);
     64     void suspendPainting();
     65     void resumePainting();
     66     void didUpdate();
     67     void updateTile(int tileID, const WebCore::IntRect& dirtyRect, float scale);
     68 
     69     // Platform overrides
     70     void paintIntoUpdateChunk(UpdateChunk*, float scale);
     71 
     72     void tileUpdateTimerFired();
     73 
     74     WebCore::IntRect m_dirtyRect;
     75     bool m_isWaitingForUpdate;
     76     bool m_shouldPaint;
     77     RunLoop::Timer<TiledDrawingArea> m_displayTimer;
     78 
     79     struct TileUpdate {
     80         int tileID;
     81         WebCore::IntRect dirtyRect;
     82         float scale;
     83     };
     84     typedef HashMap<int, TileUpdate> UpdateMap;
     85     UpdateMap m_pendingUpdates;
     86     RunLoop::Timer<TiledDrawingArea> m_tileUpdateTimer;
     87 };
     88 
     89 } // namespace WebKit
     90 
     91 #endif // TILED_BACKING_STORE
     92 
     93 #endif // TiledDrawingArea_h
     94