diff -r 000000000000 -r 4f2f89ce4247 WebKit2/Shared/win/UpdateChunk.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/Shared/win/UpdateChunk.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,76 @@
+/*
+ * 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 "WebCoreArgumentCoders.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+UpdateChunk::UpdateChunk()
+    : m_bitmapSharedMemory(0)
+{
+}
+
+UpdateChunk::UpdateChunk(const IntRect& rect)
+    : m_rect(rect)
+{
+    // Create our shared memory mapping.
+    unsigned memorySize = rect.height() * rect.width() * 4;
+    m_bitmapSharedMemory = ::CreateFileMapping(INVALID_HANDLE_VALUE, 0, PAGE_READWRITE, 0, memorySize, 0);
+}
+
+UpdateChunk::UpdateChunk(const IntRect& rect, HANDLE bitmapSharedMemory)
+    : m_rect(rect)
+    , m_bitmapSharedMemory(bitmapSharedMemory)
+{
+}
+
+void UpdateChunk::encode(CoreIPC::ArgumentEncoder& encoder) const
+{
+    encoder.encode(m_rect);
+    encoder.encode(reinterpret_cast<uintptr_t>(m_bitmapSharedMemory));
+}
+
+bool UpdateChunk::decode(CoreIPC::ArgumentDecoder& decoder, UpdateChunk& updateChunk)
+{
+    IntRect rect;
+    if (!decoder.decode(rect))
+        return false;
+    updateChunk.m_rect = rect;
+
+    uintptr_t bitmapSharedMmemory;
+    if (!decoder.decode(bitmapSharedMmemory))
+        return false;
+
+    updateChunk.m_bitmapSharedMemory = reinterpret_cast<HANDLE>(bitmapSharedMmemory);
+    return true;
+}
+
+} // namespace WebKit