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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8 * notice, this list of conditions and the following disclaimer.
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13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
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15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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26 #ifndef DrawingAreaImpl_h
27 #define DrawingAreaImpl_h
29 #include "DrawingArea.h"
30 #include "LayerTreeHost.h"
32 #include <WebCore/Region.h>
35 class GraphicsContext;
40 class ShareableBitmap;
43 class DrawingAreaImpl : public DrawingArea {
45 static PassOwnPtr<DrawingAreaImpl> create(WebPage*, const WebPageCreationParameters&);
46 virtual ~DrawingAreaImpl();
48 void layerHostDidFlushLayers();
51 DrawingAreaImpl(WebPage*, const WebPageCreationParameters&);
54 virtual void setNeedsDisplay(const WebCore::IntRect&);
55 virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
56 virtual void setLayerTreeStateIsFrozen(bool);
57 virtual void forceRepaint();
59 virtual void enableDisplayThrottling();
60 virtual void disableDisplayThrottling();
62 virtual void didInstallPageOverlay();
63 virtual void didUninstallPageOverlay();
64 virtual void setPageOverlayNeedsDisplay(const WebCore::IntRect&);
66 virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
67 virtual void scheduleCompositingLayerSync();
68 virtual void syncCompositingLayers();
71 virtual void scheduleChildWindowGeometryUpdate(const WindowGeometry&);
74 // CoreIPC message handlers.
75 virtual void updateBackingStoreState(uint64_t backingStoreStateID, bool respondImmediately, float deviceScaleFactor, const WebCore::IntSize&, const WebCore::IntSize& scrollOffset);
76 virtual void didUpdate();
77 virtual void suspendPainting();
78 virtual void resumePainting();
80 void sendDidUpdateBackingStoreState();
82 void enterAcceleratedCompositingMode(WebCore::GraphicsLayer*);
83 void exitAcceleratedCompositingModeSoon();
84 bool exitAcceleratedCompositingModePending() const { return m_exitCompositingTimer.isActive(); }
85 void exitAcceleratedCompositingMode();
87 void scheduleDisplay();
88 void displayTimerFired();
90 void display(UpdateInfo&);
91 PassOwnPtr<WebCore::GraphicsContext> createGraphicsContext(ShareableBitmap*);
93 uint64_t m_backingStoreStateID;
95 WebCore::Region m_dirtyRegion;
96 WebCore::IntRect m_scrollRect;
97 WebCore::IntSize m_scrollOffset;
99 // Whether we're currently processing an UpdateBackingStoreState message.
100 bool m_inUpdateBackingStoreState;
102 // When true, we should send an UpdateBackingStoreState message instead of any other messages
103 // we normally send to the UI process.
104 bool m_shouldSendDidUpdateBackingStoreState;
106 // Whether we're waiting for a DidUpdate message. Used for throttling paints so that the
107 // web process won't paint more frequent than the UI process can handle.
108 bool m_isWaitingForDidUpdate;
110 // True between sending the 'enter compositing' messages, and the 'exit compositing' message.
111 bool m_compositingAccordingToProxyMessages;
113 // When true, we maintain the layer tree in its current state by not leaving accelerated compositing mode
114 // and not scheduling layer flushes.
115 bool m_layerTreeStateIsFrozen;
117 // True when we were asked to exit accelerated compositing mode but couldn't because layer tree
119 bool m_wantsToExitAcceleratedCompositingMode;
121 // Whether painting is suspended. We'll still keep track of the dirty region but we
122 // won't paint until painting has resumed again.
123 bool m_isPaintingSuspended;
124 bool m_alwaysUseCompositing;
126 // Whether we should throttle displays to a set update rate on the WebProcess side.
127 bool m_shouldThrottleDisplay;
129 double m_lastDisplayTime;
131 RunLoop::Timer<DrawingAreaImpl> m_displayTimer;
132 RunLoop::Timer<DrawingAreaImpl> m_exitCompositingTimer;
134 // The layer tree host that handles accelerated compositing.
135 RefPtr<LayerTreeHost> m_layerTreeHost;
138 } // namespace WebKit
140 #endif // DrawingAreaImpl_h