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