TiledDrawingArea.h revision 65f03d4f644ce73618e5f4f50dd694b26f55ae12 
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 TiledDrawingArea_h
27#define TiledDrawingArea_h
28
29#if ENABLE(TILED_BACKING_STORE)
30
31#include "DrawingArea.h"
32#include "RunLoop.h"
33#include <WebCore/IntPoint.h>
34#include <WebCore/IntRect.h>
35#include <wtf/Vector.h>
36
37namespace WebKit {
38
39class UpdateChunk;
40
41class TiledDrawingArea : public DrawingArea {
42public:
43    TiledDrawingArea(DrawingAreaInfo::Identifier, WebPage*);
44    virtual ~TiledDrawingArea();
45
46    virtual void setNeedsDisplay(const WebCore::IntRect&);
47    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollDelta);
48    virtual void display();
49
50#if USE(ACCELERATED_COMPOSITING)
51    virtual void attachCompositingContext() { }
52    virtual void detachCompositingContext() { }
53    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*) { }
54    virtual void scheduleCompositingLayerSync() { }
55    virtual void syncCompositingLayers() { }
56#endif
57
58    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
59
60private:
61    void scheduleDisplay();
62
63    // CoreIPC message handlers.
64    void setSize(const WebCore::IntSize& viewSize);
65    void suspendPainting();
66    void resumePainting();
67    void didUpdate();
68    void updateTile(int tileID, const WebCore::IntRect& dirtyRect, float scale);
69
70    // Platform overrides
71    void paintIntoUpdateChunk(UpdateChunk*, float scale);
72
73    void tileUpdateTimerFired();
74
75    WebCore::IntRect m_dirtyRect;
76    bool m_isWaitingForUpdate;
77    bool m_shouldPaint;
78    RunLoop::Timer<TiledDrawingArea> m_displayTimer;
79
80    struct TileUpdate {
81        int tileID;
82        WebCore::IntRect dirtyRect;
83        float scale;
84    };
85    typedef HashMap<int, TileUpdate> UpdateMap;
86    UpdateMap m_pendingUpdates;
87    RunLoop::Timer<TiledDrawingArea> m_tileUpdateTimer;
88};
89
90} // namespace WebKit
91
92#endif // TILED_BACKING_STORE
93
94#endif // TiledDrawingArea_h
95