2 * Copyright (C) 2011 Apple Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
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26 #ifndef DrawingAreaProxyImpl_h
27 #define DrawingAreaProxyImpl_h
29 #include "BackingStore.h"
30 #include "DrawingAreaProxy.h"
31 #include "LayerTreeContext.h"
33 #include <wtf/OwnPtr.h>
34 #include <wtf/PassOwnPtr.h>
42 class DrawingAreaProxyImpl : public DrawingAreaProxy {
44 static PassOwnPtr<DrawingAreaProxyImpl> create(WebPageProxy*);
45 virtual ~DrawingAreaProxyImpl();
47 void paint(BackingStore::PlatformGraphicsContext, const WebCore::IntRect&, WebCore::Region& unpaintedRegion);
50 explicit DrawingAreaProxyImpl(WebPageProxy*);
53 virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext);
54 virtual void sizeDidChange();
55 virtual void deviceScaleFactorDidChange();
56 virtual void visibilityDidChange();
57 virtual void setPageIsVisible(bool);
58 virtual void setBackingStoreIsDiscardable(bool);
59 virtual void waitForBackingStoreUpdateOnNextPaint();
61 // CoreIPC message handlers
62 virtual void update(uint64_t backingStoreStateID, const UpdateInfo&);
63 virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&);
64 virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&);
65 virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&);
67 void incorporateUpdate(const UpdateInfo&);
69 enum RespondImmediatelyOrNot { DoNotRespondImmediately, RespondImmediately };
70 void backingStoreStateDidChange(RespondImmediatelyOrNot);
71 void sendUpdateBackingStoreState(RespondImmediatelyOrNot);
72 void waitForAndDispatchDidUpdateBackingStoreState();
74 #if USE(ACCELERATED_COMPOSITING)
75 void enterAcceleratedCompositingMode(const LayerTreeContext&);
76 void exitAcceleratedCompositingMode();
78 bool isInAcceleratedCompositingMode() const { return !m_layerTreeContext.isEmpty(); }
80 bool isInAcceleratedCompositingMode() const { return false; }
83 void discardBackingStoreSoon();
84 void discardBackingStore();
86 // The state ID corresponding to our current backing store. Updated whenever we allocate
87 // a new backing store. Any messages received that correspond to an earlier state are ignored,
88 // as they don't apply to our current backing store.
89 uint64_t m_currentBackingStoreStateID;
91 // The next backing store state ID we will request the web process update to. Incremented
92 // whenever our state changes in a way that will require a new backing store to be allocated.
93 uint64_t m_nextBackingStoreStateID;
95 #if USE(ACCELERATED_COMPOSITING)
96 // The current layer tree context.
97 LayerTreeContext m_layerTreeContext;
100 // Whether we've sent a UpdateBackingStoreState message and are now waiting for a DidUpdateBackingStoreState message.
101 // Used to throttle UpdateBackingStoreState messages so we don't send them faster than the Web process can handle.
102 bool m_isWaitingForDidUpdateBackingStoreState;
104 // For a new Drawing Area don't draw anything until the WebProcess has sent over the first content.
105 bool m_hasReceivedFirstUpdate;
107 bool m_isBackingStoreDiscardable;
108 OwnPtr<BackingStore> m_backingStore;
110 RunLoop::Timer<DrawingAreaProxyImpl> m_discardBackingStoreTimer;
113 } // namespace WebKit
115 #endif // DrawingAreaProxyImpl_h