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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 TiledDrawingAreaProxy_h
27 #define TiledDrawingAreaProxy_h
28 
29 #if ENABLE(TILED_BACKING_STORE)
30 
31 #include "DrawingAreaProxy.h"
32 #include <WebCore/GraphicsContext.h>
33 #include <WebCore/IntRect.h>
34 #include <wtf/HashSet.h>
35 
36 #include "RunLoop.h"
37 #include "TiledDrawingAreaTile.h"
38 
39 #if PLATFORM(MAC)
40 #include <wtf/RetainPtr.h>
41 #ifdef __OBJC__
42 @class WKView;
43 #else
44 class WKView;
45 #endif
46 #elif PLATFORM(QT)
47 class QGraphicsWKView;
48 #include <QImage>
49 #endif
50 
51 namespace WebKit {
52 
53 class UpdateChunk;
54 class WebPageProxy;
55 
56 #if PLATFORM(MAC)
57 typedef WKView PlatformWebView;
58 #elif PLATFORM(WIN)
59 class WebView;
60 typedef WebView PlatformWebView;
61 #elif PLATFORM(QT)
62 typedef QGraphicsWKView PlatformWebView;
63 #endif
64 
65 class TiledDrawingAreaProxy : public DrawingAreaProxy {
66 public:
67     static PassOwnPtr<TiledDrawingAreaProxy> create(PlatformWebView* webView, WebPageProxy*);
68 
69     TiledDrawingAreaProxy(PlatformWebView*, WebPageProxy*);
70     virtual ~TiledDrawingAreaProxy();
71 
contentsScale()72     float contentsScale() const { return m_contentsScale; }
73     void setContentsScale(float);
74 
75     void waitUntilUpdatesComplete();
76 
77     void takeSnapshot(const WebCore::IntSize& size, const WebCore::IntRect& contentsRect);
78 
79 #if USE(ACCELERATED_COMPOSITING)
attachCompositingContext(uint32_t)80     virtual void attachCompositingContext(uint32_t /* contextID */) { }
detachCompositingContext()81     virtual void detachCompositingContext() { }
82 #endif
83 
84     void paint(WebCore::GraphicsContext*, const WebCore::IntRect&);
85 
tileSize()86     WebCore::IntSize tileSize() { return m_tileSize; }
87     void setTileSize(const WebCore::IntSize&);
88 
tileCreationDelay()89     double tileCreationDelay() const { return m_tileCreationDelay; }
90     void setTileCreationDelay(double delay);
91 
92     // Tiled are dropped outside the keep area, and created for cover area. The values a relative to the viewport size.
getKeepAndCoverAreaMultipliers(WebCore::FloatSize & keepMultiplier,WebCore::FloatSize & coverMultiplier)93     void getKeepAndCoverAreaMultipliers(WebCore::FloatSize& keepMultiplier, WebCore::FloatSize& coverMultiplier)
94     {
95         keepMultiplier = m_keepAreaMultiplier;
96         coverMultiplier = m_coverAreaMultiplier;
97     }
98     void setKeepAndCoverAreaMultipliers(const WebCore::FloatSize& keepMultiplier, const WebCore::FloatSize& coverMultiplier);
99 
100     void tileBufferUpdateComplete();
101 
102     WebCore::IntRect mapToContents(const WebCore::IntRect&) const;
103     WebCore::IntRect mapFromContents(const WebCore::IntRect&) const;
104 
105     bool hasPendingUpdates() const;
106 
107 private:
108     WebPageProxy* page();
109     WebCore::IntRect webViewVisibleRect();
110     void updateWebView(const Vector<WebCore::IntRect>& paintedArea);
111 
112     void snapshotTaken(UpdateChunk&);
113 
114     // DrawingAreaProxy
115     virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
116     virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext);
117     virtual void sizeDidChange();
118     virtual void setPageIsVisible(bool isVisible);
119 
120     void didSetSize(const WebCore::IntSize&);
121     void invalidate(const WebCore::IntRect& rect);
122     void adjustVisibleRect();
123 
124     void requestTileUpdate(int tileID, const WebCore::IntRect& dirtyRect);
125 
126     PassRefPtr<TiledDrawingAreaTile> createTile(const TiledDrawingAreaTile::Coordinate&);
127 
128     void startTileBufferUpdateTimer();
129     void startTileCreationTimer();
130 
131     void tileBufferUpdateTimerFired();
132     void tileCreationTimerFired();
133 
134     void updateTileBuffers();
135     void createTiles();
136 
137     bool resizeEdgeTiles();
138     void dropTilesOutsideRect(const WebCore::IntRect&);
139 
140     PassRefPtr<TiledDrawingAreaTile> tileAt(const TiledDrawingAreaTile::Coordinate&) const;
141     void setTile(const TiledDrawingAreaTile::Coordinate& coordinate, RefPtr<TiledDrawingAreaTile> tile);
142     void removeTile(const TiledDrawingAreaTile::Coordinate& coordinate);
143     void removeAllTiles();
144 
145     WebCore::IntRect contentsRect() const;
146 
147     WebCore::IntRect calculateKeepRect(const WebCore::IntRect& visibleRect) const;
148     WebCore::IntRect calculateCoverRect(const WebCore::IntRect& visibleRect) const;
149 
150     WebCore::IntRect tileRectForCoordinate(const TiledDrawingAreaTile::Coordinate&) const;
151     TiledDrawingAreaTile::Coordinate tileCoordinateForPoint(const WebCore::IntPoint&) const;
152     double tileDistance(const WebCore::IntRect& viewport, const TiledDrawingAreaTile::Coordinate&);
153 
154 private:
155     bool m_isWaitingForDidSetFrameNotification;
156     bool m_isVisible;
157 
158     WebCore::IntSize m_viewSize; // Size of the BackingStore as well.
159     WebCore::IntSize m_lastSetViewSize;
160 
161     PlatformWebView* m_webView;
162 
163     typedef HashMap<TiledDrawingAreaTile::Coordinate, RefPtr<TiledDrawingAreaTile> > TileMap;
164     TileMap m_tiles;
165 
166     WTF::HashMap<int, TiledDrawingAreaTile*> m_tilesByID;
167 
168     typedef RunLoop::Timer<TiledDrawingAreaProxy> TileTimer;
169     TileTimer m_tileBufferUpdateTimer;
170     TileTimer m_tileCreationTimer;
171 
172     WebCore::IntSize m_tileSize;
173     double m_tileCreationDelay;
174     WebCore::FloatSize m_keepAreaMultiplier;
175     WebCore::FloatSize m_coverAreaMultiplier;
176 
177     WebCore::IntRect m_previousVisibleRect;
178     float m_contentsScale;
179 
180     friend class TiledDrawingAreaTile;
181 };
182 
183 } // namespace WebKit
184 
185 #endif // TILED_BACKING_STORE
186 
187 #endif // TiledDrawingAreaProxy_h
188