diff -r 000000000000 -r 4f2f89ce4247 WebKit2/Shared/mac/UpdateChunk.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/Shared/mac/UpdateChunk.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,92 @@
+/*
+ * Copyright (C) 2010 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "UpdateChunk.h"
+
+#include "ArgumentDecoder.h"
+#include "ArgumentEncoder.h"
+#include "Attachment.h"
+#include "WebCoreArgumentCoders.h"
+#include <WebCore/FloatRect.h>
+#include <mach/vm_map.h>
+#include <wtf/RetainPtr.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+UpdateChunk::UpdateChunk()
+    : m_data(0)
+    , m_size(0)
+{
+}
+
+UpdateChunk::UpdateChunk(const IntRect& rect)
+    : m_rect(rect)
+    , m_size(size())
+{
+    vm_allocate(mach_task_self(), reinterpret_cast<vm_address_t*>(&m_data), m_size, VM_FLAGS_ANYWHERE);
+}
+
+UpdateChunk::~UpdateChunk()
+{
+    if (m_data)
+        vm_deallocate(mach_task_self(), reinterpret_cast<vm_address_t>(m_data), m_size);
+}
+
+RetainPtr<CGImageRef> UpdateChunk::createImage()
+{
+    RetainPtr<CGDataProviderRef> provider(AdoptCF, CGDataProviderCreateWithData(0, m_data, size(), 0));
+    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
+    RetainPtr<CGImageRef> image(AdoptCF, CGImageCreate(m_rect.width(), m_rect.height(), 8, 32, m_rect.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host, provider.get(), 0, false, kCGRenderingIntentDefault));
+    
+    return image;
+}
+
+void UpdateChunk::encode(CoreIPC::ArgumentEncoder& encoder) const
+{
+    encoder.encode(m_rect);
+    encoder.encode(CoreIPC::Attachment(m_data, size(), MACH_MSG_VIRTUAL_COPY, true));
+    
+    m_data = 0;
+}
+
+bool UpdateChunk::decode(CoreIPC::ArgumentDecoder& decoder, UpdateChunk& chunk)
+{
+    IntRect rect;
+    if (!decoder.decode(rect))
+        return false;
+    chunk.m_rect = rect;
+    
+    CoreIPC::Attachment attachment;
+    if (!decoder.decode(attachment))
+        return false;
+
+    chunk.m_size = attachment.size();
+    chunk.m_data = reinterpret_cast<uint8_t*>(attachment.address());
+    return true;
+}
+
+} // namespace WebKit