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diff --git a/WebCore/platform/graphics/qt/TransparencyLayer.h b/WebCore/platform/graphics/qt/TransparencyLayer.h
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+++ b/WebCore/platform/graphics/qt/TransparencyLayer.h
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+/*
+ * Copyright (C) 2006 Dirk Mueller <mueller@kde.org>
+ * Copyright (C) 2006 Zack Rusin <zack@kde.org>
+ * Copyright (C) 2006 George Staikos <staikos@kde.org>
+ * Copyright (C) 2006 Simon Hausmann <hausmann@kde.org>
+ * Copyright (C) 2006 Allan Sandfeld Jensen <sandfeld@kde.org>
+ * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
+ * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
+ * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
+ * Copyright (C) 2008 Dirk Schulze <vbs85@gmx.de>
+ *
+ * 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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.
+ */
+
+#ifndef TransparencyLayer_h
+#define TransparencyLayer_h
+
+#include <QPaintEngine>
+#include <QPainter>
+#include <QPixmap>
+
+namespace WebCore {
+
+struct TransparencyLayer : FastAllocBase {
+    TransparencyLayer(const QPainter* p, const QRect &rect, qreal opacity, QPixmap& alphaMask)
+        : pixmap(rect.width(), rect.height())
+        , opacity(opacity)
+        , alphaMask(alphaMask)
+        , saveCounter(1) // see the comment for saveCounter
+    {
+        offset = rect.topLeft();
+        pixmap.fill(Qt::transparent);
+        painter.begin(&pixmap);
+        painter.setRenderHint(QPainter::Antialiasing, p->testRenderHint(QPainter::Antialiasing));
+        painter.translate(-offset);
+        painter.setPen(p->pen());
+        painter.setBrush(p->brush());
+        painter.setTransform(p->transform(), true);
+        painter.setOpacity(p->opacity());
+        painter.setFont(p->font());
+        if (painter.paintEngine()->hasFeature(QPaintEngine::PorterDuff))
+            painter.setCompositionMode(p->compositionMode());
+        // if the path is an empty region, this assignment disables all painting
+        if (!p->clipPath().isEmpty())
+            painter.setClipPath(p->clipPath());
+    }
+
+    TransparencyLayer()
+    {
+    }
+
+    QPixmap pixmap;
+    QPoint offset;
+    QPainter painter;
+    qreal opacity;
+    // for clipToImageBuffer
+    QPixmap alphaMask;
+    // saveCounter is only used in combination with alphaMask
+    // otherwise, its value is unspecified
+    int saveCounter;
+private:
+    TransparencyLayer(const TransparencyLayer &) {}
+    TransparencyLayer & operator=(const TransparencyLayer &) { return *this; }
+};
+
+} // namespace WebCore
+
+#endif // TransparencyLayer_h