DrawingAreaImpl.h revision ab9e7a118cf1ea2e3a93dce683b2ded3e7291ddb 
1/*
2 * Copyright (C) 2011 Apple Inc. All rights reserved.
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 DrawingAreaImpl_h
27#define DrawingAreaImpl_h
28
29#include "DrawingArea.h"
30#include "Region.h"
31#include "RunLoop.h"
32
33namespace WebKit {
34
35struct UpdateInfo;
36
37class DrawingAreaImpl : public DrawingArea {
38public:
39    static PassRefPtr<DrawingAreaImpl> create(WebPage*, const WebPageCreationParameters&);
40    virtual ~DrawingAreaImpl();
41
42private:
43    DrawingAreaImpl(WebPage*, const WebPageCreationParameters&);
44
45    // DrawingArea
46    virtual void setNeedsDisplay(const WebCore::IntRect&);
47    virtual void scroll(const WebCore::IntRect& scrollRect, const WebCore::IntSize& scrollOffset);
48    virtual void attachCompositingContext();
49    virtual void detachCompositingContext();
50    virtual void setRootCompositingLayer(WebCore::GraphicsLayer*);
51    virtual void scheduleCompositingLayerSync();
52    virtual void syncCompositingLayers();
53    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
54
55    // CoreIPC message handlers.
56    virtual void setSize(const WebCore::IntSize&);
57    virtual void didUpdate();
58    virtual void suspendPainting();
59    virtual void resumePainting();
60
61    void scheduleDisplay();
62    void display();
63    void display(UpdateInfo&);
64
65    Region m_dirtyRegion;
66    WebCore::IntRect m_scrollRect;
67    WebCore::IntSize m_scrollOffset;
68
69    // Whether we're waiting for a DidUpdate message. Used for throttling paints so that the
70    // web process won't paint more frequent than the UI process can handle.
71    bool m_isWaitingForDidUpdate;
72
73    // Whether painting is suspended. We'll still keep track of the dirty region but we
74    // won't paint until painting has resumed again.
75    bool m_isPaintingSuspended;
76
77    RunLoop::Timer<DrawingAreaImpl> m_displayTimer;
78};
79
80} // namespace WebKit
81
82#endif // DrawingAreaImpl_h
83