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 33 using namespace WebCore; 34 35 namespace WebKit { 36 37 ShareableBitmap::Handle::Handle() 38 : m_flags(0) 39 { 40 } 41 42 void 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 49 bool 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 60 PassRefPtr<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 71 PassRefPtr<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 82 PassRefPtr<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 92 PassRefPtr<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 } 101 102 bool 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 } 112 113 ShareableBitmap::ShareableBitmap(const IntSize& size, Flags flags, void* data) 114 : m_size(size) 115 , m_flags(flags) 116 , m_data(data) 117 { 118 } 119 120 ShareableBitmap::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 } 127 128 ShareableBitmap::~ShareableBitmap() 129 { 130 if (!isBackedBySharedMemory()) 131 fastFree(m_data); 132 } 133 134 bool 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 } 156 157 void* 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