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      1 /*
      2  * Copyright (C) 2011 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 DrawingAreaImpl_h
     27 #define DrawingAreaImpl_h
     28 
     29 #include "DrawingArea.h"
     30 #include "LayerTreeHost.h"
     31 #include "Region.h"
     32 #include "RunLoop.h"
     33 
     34 namespace WebKit {
     35 
     36 class UpdateInfo;
     37 
     38 class DrawingAreaImpl : public DrawingArea {
     39 public:
     40     static PassOwnPtr<DrawingAreaImpl> create(WebPage*, const WebPageCreationParameters&);
     41     virtual ~DrawingAreaImpl();
     42 
     43     void setLayerHostNeedsDisplay();
     44     void layerHostDidFlushLayers();
     45 
     46 private:
     47     DrawingAreaImpl(WebPage*, const WebPageCreationParameters&);
     48 
     49     // DrawingArea
     50     virtual void setNeedsDisplay(const WebCore::IntRect&);
     51     virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
     52     virtual void forceRepaint();
     53 
     54     virtual void didInstallPageOverlay();
     55     virtual void didUninstallPageOverlay();
     56     virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&);
     57 
     58     virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
     59     virtual void scheduleCompositingLayerSync();
     60     virtual void syncCompositingLayers();
     61     virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
     62 
     63     // CoreIPC message handlers.
     64     virtual void updateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, const WebCore::IntSize&, const WebCore::IntSize& scrollOffset);
     65     virtual void didUpdate();
     66     virtual void suspendPainting();
     67     virtual void resumePainting();
     68 
     69     void sendDidUpdateBackingStoreState();
     70 
     71     void enterAcceleratedCompositingMode(WebCore::GraphicsLayer*);
     72     void exitAcceleratedCompositingModeSoon();
     73     void exitAcceleratedCompositingMode();
     74 
     75     void scheduleDisplay();
     76     void displayTimerFired();
     77     void display();
     78     void display(UpdateInfo&);
     79 
     80     uint64_t m_backingStoreStateID;
     81 
     82     Region m_dirtyRegion;
     83     WebCore::IntRect m_scrollRect;
     84     WebCore::IntSize m_scrollOffset;
     85 
     86     // Whether we're currently processing an UpdateBackingStoreState message.
     87     bool m_inUpdateBackingStoreState;
     88 
     89     // When true, we should send an UpdateBackingStoreState message instead of any other messages
     90     // we normally send to the UI process.
     91     bool m_shouldSendDidUpdateBackingStoreState;
     92 
     93     // Whether we're waiting for a DidUpdate message. Used for throttling paints so that the
     94     // web process won't paint more frequent than the UI process can handle.
     95     bool m_isWaitingForDidUpdate;
     96 
     97     // Whether painting is suspended. We'll still keep track of the dirty region but we
     98     // won't paint until painting has resumed again.
     99     bool m_isPaintingSuspended;
    100     bool m_alwaysUseCompositing;
    101 
    102     double m_lastDisplayTime;
    103 
    104     RunLoop::Timer<DrawingAreaImpl> m_displayTimer;
    105     RunLoop::Timer<DrawingAreaImpl> m_exitCompositingTimer;
    106 
    107     // The layer tree host that handles accelerated compositing.
    108     RefPtr<LayerTreeHost> m_layerTreeHost;
    109 };
    110 
    111 } // namespace WebKit
    112 
    113 #endif // DrawingAreaImpl_h
    114