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#include "config.h"
27#include "ShareableBitmap.h"
28
29#include "SharedMemory.h"
30#include "WebCoreArgumentCoders.h"
31#include <WebCore/GraphicsContext.h>
32
33using namespace WebCore;
34
35namespace WebKit {
36
37ShareableBitmap::Handle::Handle()
38    : m_flags(0)
39{
40}
41
42void ShareableBitmap::Handle::encode(CoreIPC::ArgumentEncoder* encoder) const
43{
44    encoder->encode(m_handle);
45    encoder->encode(m_size);
46    encoder->encode(m_flags);
47}
48
49bool ShareableBitmap::Handle::decode(CoreIPC::ArgumentDecoder* decoder, Handle& handle)
50{
51    if (!decoder->decode(handle.m_handle))
52        return false;
53    if (!decoder->decode(handle.m_size))
54        return false;
55    if (!decoder->decode(handle.m_flags))
56        return false;
57    return true;
58}
59
60PassRefPtr<ShareableBitmap> ShareableBitmap::create(const IntSize& size, Flags flags)
61{
62    size_t numBytes = numBytesForSize(size);
63
64    void* data = 0;
65    if (!tryFastMalloc(numBytes).getValue(data))
66        return 0;
67
68    return adoptRef(new ShareableBitmap(size, flags, data));
69}
70
71PassRefPtr<ShareableBitmap> ShareableBitmap::createShareable(const IntSize& size, Flags flags)
72{
73    size_t numBytes = numBytesForSize(size);
74
75    RefPtr<SharedMemory> sharedMemory = SharedMemory::create(numBytes);
76    if (!sharedMemory)
77        return 0;
78
79    return adoptRef(new ShareableBitmap(size, flags, sharedMemory));
80}
81
82PassRefPtr<ShareableBitmap> ShareableBitmap::create(const IntSize& size, Flags flags, PassRefPtr<SharedMemory> sharedMemory)
83{
84    ASSERT(sharedMemory);
85
86    size_t numBytes = numBytesForSize(size);
87    ASSERT_UNUSED(numBytes, sharedMemory->size() >= numBytes);
88
89    return adoptRef(new ShareableBitmap(size, flags, sharedMemory));
90}
91
92PassRefPtr<ShareableBitmap> ShareableBitmap::create(const Handle& handle)
93{
94    // Create the shared memory.
95    RefPtr<SharedMemory> sharedMemory = SharedMemory::create(handle.m_handle, SharedMemory::ReadWrite);
96    if (!sharedMemory)
97        return 0;
98
99    return create(handle.m_size, handle.m_flags, sharedMemory.release());
100}
101
102bool ShareableBitmap::createHandle(Handle& handle)
103{
104    ASSERT(isBackedBySharedMemory());
105
106    if (!m_sharedMemory->createHandle(handle.m_handle, SharedMemory::ReadWrite))
107        return false;
108    handle.m_size = m_size;
109    handle.m_flags = m_flags;
110    return true;
111}
112
113ShareableBitmap::ShareableBitmap(const IntSize& size, Flags flags, void* data)
114    : m_size(size)
115    , m_flags(flags)
116    , m_data(data)
117{
118}
119
120ShareableBitmap::ShareableBitmap(const IntSize& size, Flags flags, PassRefPtr<SharedMemory> sharedMemory)
121    : m_size(size)
122    , m_flags(flags)
123    , m_sharedMemory(sharedMemory)
124    , m_data(0)
125{
126}
127
128ShareableBitmap::~ShareableBitmap()
129{
130    if (!isBackedBySharedMemory())
131        fastFree(m_data);
132}
133
134bool ShareableBitmap::resize(const IntSize& size)
135{
136    // We can't resize backing stores that are backed by shared memory.
137    ASSERT(!isBackedBySharedMemory());
138
139    if (size == m_size)
140        return true;
141
142    size_t newNumBytes = numBytesForSize(size);
143
144    // Try to resize.
145    char* newData = 0;
146    if (!tryFastRealloc(m_data, newNumBytes).getValue(newData)) {
147        // We failed, but the backing store is still kept in a consistent state.
148        return false;
149    }
150
151    m_size = size;
152    m_data = newData;
153
154    return true;
155}
156
157void* ShareableBitmap::data() const
158{
159    if (isBackedBySharedMemory())
160        return m_sharedMemory->data();
161
162    ASSERT(m_data);
163    return m_data;
164}
165
166} // namespace WebKit
167