1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 * Portions Copyright (c) 2010 Motorola Mobility, Inc.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
15 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
16 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
18 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
24 * THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#ifndef DrawingAreaProxy_h
28#define DrawingAreaProxy_h
29
30#include "DrawingAreaInfo.h"
31#include <stdint.h>
32#include <WebCore/IntSize.h>
33#include <wtf/Noncopyable.h>
34
35#if PLATFORM(QT)
36class QPainter;
37#elif PLATFORM(GTK)
38typedef struct _cairo cairo_t;
39#endif
40
41namespace CoreIPC {
42    class ArgumentDecoder;
43    class Connection;
44    class MessageID;
45}
46
47namespace WebCore {
48    class IntRect;
49}
50
51namespace WebKit {
52
53class LayerTreeContext;
54class UpdateInfo;
55class WebPageProxy;
56
57#if PLATFORM(MAC)
58typedef CGContextRef PlatformDrawingContext;
59#elif PLATFORM(WIN)
60typedef HDC PlatformDrawingContext;
61#elif PLATFORM(QT)
62typedef QPainter* PlatformDrawingContext;
63#elif PLATFORM(GTK)
64typedef cairo_t* PlatformDrawingContext;
65#endif
66
67class DrawingAreaProxy {
68    WTF_MAKE_NONCOPYABLE(DrawingAreaProxy);
69
70public:
71    virtual ~DrawingAreaProxy();
72
73    DrawingAreaType type() const { return m_type; }
74
75#if PLATFORM(MAC) || PLATFORM(WIN)
76    void didReceiveDrawingAreaProxyMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*);
77#endif
78
79    virtual void didReceiveMessage(CoreIPC::Connection*, CoreIPC::MessageID, CoreIPC::ArgumentDecoder*) = 0;
80
81    // Returns true if painting was successful, false otherwise.
82    virtual bool paint(const WebCore::IntRect&, PlatformDrawingContext) = 0;
83
84    virtual void sizeDidChange() = 0;
85
86    // FIXME: These should be pure virtual.
87    virtual void visibilityDidChange() { }
88    virtual void setBackingStoreIsDiscardable(bool) { }
89
90    virtual void setPageIsVisible(bool isVisible) = 0;
91
92    const WebCore::IntSize& size() const { return m_size; }
93    void setSize(const WebCore::IntSize&, const WebCore::IntSize& scrollOffset);
94
95protected:
96    explicit DrawingAreaProxy(DrawingAreaType, WebPageProxy*);
97
98    DrawingAreaType m_type;
99    WebPageProxy* m_webPageProxy;
100
101    WebCore::IntSize m_size;
102    WebCore::IntSize m_scrollOffset;
103
104private:
105    // CoreIPC message handlers.
106    // FIXME: These should be pure virtual.
107    virtual void update(uint64_t backingStoreStateID, const UpdateInfo&) { }
108    virtual void didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo&, const LayerTreeContext&) { }
109#if USE(ACCELERATED_COMPOSITING)
110    virtual void enterAcceleratedCompositingMode(uint64_t backingStoreStateID, const LayerTreeContext&) { }
111    virtual void exitAcceleratedCompositingMode(uint64_t backingStoreStateID, const UpdateInfo&) { }
112#endif
113};
114
115} // namespace WebKit
116
117#endif // DrawingAreaProxy_h
118