1/*
2 * Copyright (C) 2010 Apple Inc. All rights reserved.
3 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
4 * Copyright (C) 2010 University of Szeged
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#include "config.h"
29#include "UpdateChunk.h"
30
31#include "ArgumentDecoder.h"
32#include "ArgumentEncoder.h"
33#include "WebCoreArgumentCoders.h"
34#include <QIODevice>
35#include <QImage>
36#include <QPixmap>
37#include <WebCore/FloatRect.h>
38#include <wtf/text/WTFString.h>
39
40using namespace WebCore;
41using namespace std;
42
43namespace WebKit {
44
45UpdateChunk::UpdateChunk()
46{
47}
48
49UpdateChunk::UpdateChunk(const IntRect& rect)
50    : m_rect(rect)
51    , m_sharedMemory(SharedMemory::create(size()))
52{
53}
54
55UpdateChunk::~UpdateChunk()
56{
57}
58
59void UpdateChunk::encode(CoreIPC::ArgumentEncoder* encoder) const
60{
61    encoder->encode(m_rect);
62    if (!m_sharedMemory) {
63        encoder->encode(false);
64        return;
65    }
66
67    SharedMemory::Handle handle;
68    if (m_sharedMemory->createHandle(handle, SharedMemory::ReadOnly)) {
69        encoder->encode(true);
70        encoder->encode(handle);
71    } else
72        encoder->encode(false);
73
74    m_sharedMemory = 0;
75}
76
77bool UpdateChunk::decode(CoreIPC::ArgumentDecoder* decoder, UpdateChunk& chunk)
78{
79    ASSERT_ARG(chunk, chunk.isEmpty());
80
81    IntRect rect;
82    if (!decoder->decode(rect))
83        return false;
84
85    chunk.m_rect = rect;
86
87    bool hasSharedMemory;
88    if (!decoder->decode(hasSharedMemory))
89        return false;
90
91    if (!hasSharedMemory) {
92        chunk.m_sharedMemory = 0;
93        return true;
94    }
95
96    SharedMemory::Handle handle;
97    if (!decoder->decode(handle))
98        return false;
99
100    chunk.m_sharedMemory = SharedMemory::create(handle, SharedMemory::ReadOnly);
101    return true;
102}
103
104size_t UpdateChunk::size() const
105{
106    int bpp;
107    if (QPixmap::defaultDepth() == 16)
108        bpp = 2;
109    else
110        bpp = 4;
111
112    return ((m_rect.width() * bpp + 3) & ~0x3)
113           * m_rect.height();
114}
115
116QImage UpdateChunk::createImage() const
117{
118    ASSERT(m_sharedMemory);
119    if (!m_sharedMemory)
120        return QImage();
121
122    QImage::Format format;
123    int bpp;
124    if (QPixmap::defaultDepth() == 16) {
125        format = QImage::Format_RGB16;
126        bpp = 2;
127    } else {
128        format = QImage::Format_RGB32;
129        bpp = 4;
130    }
131
132    return QImage(reinterpret_cast<unsigned char*>(m_sharedMemory->data()), m_rect.width(), m_rect.height(), (m_rect.width() * bpp + 3) & ~0x3, format);
133}
134
135} // namespace WebKit
136