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      1 /*
      2  * Copyright (C) 2010 Apple Inc. All rights reserved.
      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 ChunkedUpdateDrawingArea_h
     27 #define ChunkedUpdateDrawingArea_h
     28 
     29 #include "DrawingArea.h"
     30 #include "RunLoop.h"
     31 #include <WebCore/IntPoint.h>
     32 
     33 namespace WebKit {
     34 
     35 class UpdateChunk;
     36 
     37 class ChunkedUpdateDrawingArea : public DrawingArea {
     38 public:
     39     explicit ChunkedUpdateDrawingArea(WebPage*);
     40     virtual ~ChunkedUpdateDrawingArea();
     41 
     42     virtual void setNeedsDisplay(const WebCore::IntRect&);
     43     virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
     44     virtual void display();
     45     virtual void forceRepaint();
     46 
     47 #if USE(ACCELERATED_COMPOSITING)
     48     virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
     49     virtual void scheduleCompositingLayerSync() { }
     50     virtual void syncCompositingLayers() { }
     51 #endif
     52 
     53     virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
     54 
     55 private:
     56     void scheduleDisplay();
     57 
     58     // CoreIPC message handlers.
     59     void setSize(const WebCore::IntSize& viewSize);
     60     void suspendPainting();
     61     void deprecatedResumePainting(bool forceRepaint);
     62     void didUpdate();
     63 
     64     // Platform overrides
     65     void paintIntoUpdateChunk(UpdateChunk*);
     66 
     67     WebCore::IntRect m_dirtyRect;
     68     bool m_isWaitingForUpdate;
     69     bool m_paintingIsSuspended;
     70     RunLoop::Timer<ChunkedUpdateDrawingArea> m_displayTimer;
     71 };
     72 
     73 } // namespace WebKit
     74 
     75 #endif // ChunkedUpdateDrawingArea_h
     76