1/*
2 * Copyright (C) 2010 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 UpdateChunk_h
27#define UpdateChunk_h
28
29#include <WebCore/IntRect.h>
30#include <wtf/RetainPtr.h>
31
32namespace CoreIPC {
33    class ArgumentEncoder;
34    class ArgumentDecoder;
35}
36
37namespace WebKit {
38
39class UpdateChunk {
40public:
41    UpdateChunk();
42    UpdateChunk(const WebCore::IntRect&);
43    ~UpdateChunk();
44
45    uint8_t* data() { return m_data; }
46    const WebCore::IntRect& rect() const { return m_rect; }
47    bool isEmpty() const { return m_rect.isEmpty(); }
48
49    void encode(CoreIPC::ArgumentEncoder*) const;
50    static bool decode(CoreIPC::ArgumentDecoder*, UpdateChunk&);
51
52    RetainPtr<CGImageRef> createImage();
53
54private:
55    size_t size() const { return m_rect.width() * 4 * m_rect.height(); }
56
57    WebCore::IntRect m_rect;
58
59    // This needs to be mutable, because encoding an update chunk will hand over its memory to the target process.
60    mutable uint8_t* m_data;
61    size_t m_size;
62};
63
64} // namespace WebKit
65
66#endif // UpdateChunk_h
67