diff -r 000000000000 -r 4f2f89ce4247 WebKit2/UIProcess/win/ChunkedUpdateDrawingAreaProxyWin.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/UIProcess/win/ChunkedUpdateDrawingAreaProxyWin.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,105 @@
+/*
+ * 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 "ChunkedUpdateDrawingAreaProxy.h"
+
+#include "UpdateChunk.h"
+#include "WebProcessProxy.h"
+#include "WebView.h"
+#include <WebCore/BitmapInfo.h>
+
+using namespace WebCore;
+
+namespace WebKit {
+
+WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
+{
+    return m_webView->page();
+}
+
+void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
+{
+    if (m_backingStoreBitmap)
+        return;
+
+    BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(m_viewSize);
+
+    void* pixels = 0;
+    m_backingStoreBitmap.set(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, 0, 0));
+
+    if (!m_backingStoreDC) {
+        // Create a DC for the backing store.
+        HDC screenDC = ::GetDC(0);
+        m_backingStoreDC.set(::CreateCompatibleDC(screenDC));
+        ::ReleaseDC(0, screenDC);
+    }
+
+    ::SelectObject(m_backingStoreDC.get(), m_backingStoreBitmap.get());
+}
+
+void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
+{
+    m_backingStoreBitmap.clear();
+}
+
+void ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, HDC hdc)
+{
+    if (!m_backingStoreBitmap)
+        return;
+
+    // BitBlt from the backing-store to the passed in hdc.
+    ::BitBlt(hdc, rect.x(), rect.y(), rect.width(), rect.height(), m_backingStoreDC.get(), rect.x(), rect.y(), SRCCOPY);
+}
+
+void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
+{
+    ensureBackingStore();
+
+    OwnPtr<HDC> updateChunkBitmapDC(::CreateCompatibleDC(m_backingStoreDC.get()));
+
+    // Create a bitmap.
+    BitmapInfo bitmapInfo = BitmapInfo::createBottomUp(updateChunk->rect().size());
+
+    // Duplicate the update chunk handle.
+    HANDLE updateChunkHandle;
+    BOOL result = ::DuplicateHandle(m_webView->page()->process()->processIdentifier(), updateChunk->memory(),
+                                    ::GetCurrentProcess(), &updateChunkHandle, STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ | FILE_MAP_WRITE, false, DUPLICATE_CLOSE_SOURCE);
+
+    void* pixels = 0;
+    OwnPtr<HBITMAP> hBitmap(::CreateDIBSection(0, &bitmapInfo, DIB_RGB_COLORS, &pixels, updateChunkHandle, 0));
+    ::SelectObject(updateChunkBitmapDC.get(), hBitmap.get());
+
+    // BitBlt from the UpdateChunk to the backing store.
+    ::BitBlt(m_backingStoreDC.get(), updateChunk->rect().x(), updateChunk->rect().y(), updateChunk->rect().width(), updateChunk->rect().height(), updateChunkBitmapDC.get(), 0, 0, SRCCOPY);
+
+    // FIXME: We should not do this here.
+    ::CloseHandle(updateChunkHandle);
+
+    // Invalidate the WebView's HWND.
+    RECT rect = updateChunk->rect();
+    ::InvalidateRect(m_webView->window(), &rect, false);
+}
+
+} // namespace WebKit