1 /*
2  * Copyright (C) 2010 Apple Inc. All rights reserved.
3  * Portions Copyright (c) 2010 Motorola Mobility, Inc.  All rights reserved.
4  * Copyright (C) 2011 Igalia S.L
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
17  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
19  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
25  * THE POSSIBILITY OF SUCH DAMAGE.
26  */
27 
28 #ifndef UpdateChunk_h
29 #define UpdateChunk_h
30 
31 #include "IntRect.h"
32 #include "SharedMemory.h"
33 
34 #include <cairo.h>
35 
36 namespace CoreIPC {
37 class ArgumentEncoder;
38 class ArgumentDecoder;
39 }
40 
41 namespace WebKit {
42 
43 class UpdateChunk {
44 public:
45     UpdateChunk();
46     UpdateChunk(const WebCore::IntRect&);
47     ~UpdateChunk();
48 
rect()49     const WebCore::IntRect& rect() const { return m_rect; }
isEmpty()50     bool isEmpty() { return m_rect.isEmpty(); }
51 
52     void encode(CoreIPC::ArgumentEncoder*) const;
53     static bool decode(CoreIPC::ArgumentDecoder*, UpdateChunk&);
54 
55     cairo_surface_t* createImage() const;
56 
57 private:
58     size_t size() const;
59     int m_stride;
60     WebCore::IntRect m_rect;
61     mutable RefPtr<SharedMemory> m_sharedMemory;
62 };
63 
64 } // namespace WebKit
65 
66 
67 #endif // UpdateChunk_h
68