diff -r 000000000000 -r 4f2f89ce4247 WebKit2/UIProcess/mac/ChunkedUpdateDrawingAreaProxyMac.mm
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit2/UIProcess/mac/ChunkedUpdateDrawingAreaProxyMac.mm	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,83 @@
+/*
+ * 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 "DrawingAreaMessageKinds.h"
+#include "DrawingAreaProxyMessageKinds.h"
+#include "UpdateChunk.h"
+#include "WKAPICast.h"
+#include "WKView.h"
+#include "WebPageProxy.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+WebPageProxy* ChunkedUpdateDrawingAreaProxy::page()
+{
+    return toWK([m_webView pageRef]);
+}
+
+void ChunkedUpdateDrawingAreaProxy::ensureBackingStore()
+{
+    if (m_bitmapContext)
+        return;
+
+    RetainPtr<CGColorSpaceRef> colorSpace(AdoptCF, CGColorSpaceCreateDeviceRGB());
+    m_bitmapContext.adoptCF(CGBitmapContextCreate(0, m_viewSize.width(), m_viewSize.height(), 8, m_viewSize.width() * 4, colorSpace.get(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host));
+    
+    // Flip the bitmap context coordinate system.
+    CGContextTranslateCTM(m_bitmapContext.get(), 0, m_viewSize.height());
+    CGContextScaleCTM(m_bitmapContext.get(), 1, -1);
+}
+
+void ChunkedUpdateDrawingAreaProxy::invalidateBackingStore()
+{
+    m_bitmapContext = 0;
+}
+
+void ChunkedUpdateDrawingAreaProxy::platformPaint(const IntRect& rect, CGContextRef context)
+{
+    if (!m_bitmapContext)
+        return;
+
+    RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(m_bitmapContext.get()));
+    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image.get()), CGImageGetHeight(image.get())), image.get());
+}
+
+void ChunkedUpdateDrawingAreaProxy::drawUpdateChunkIntoBackingStore(UpdateChunk* updateChunk)
+{
+    ensureBackingStore();
+
+    RetainPtr<CGImageRef> image(updateChunk->createImage());
+    const IntRect& updateChunkRect = updateChunk->rect();
+
+    CGContextDrawImage(m_bitmapContext.get(), CGRectMake(updateChunkRect.x(), m_viewSize.height() - updateChunkRect.bottom(), 
+                                                         updateChunkRect.width(), updateChunkRect.height()), image.get());
+    [m_webView setNeedsDisplayInRect:NSRectFromCGRect(updateChunkRect)];
+}
+
+} // namespace WebKit