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diff --git a/Source/WebCore/rendering/SVGImageBufferTools.cpp b/Source/WebCore/rendering/SVGImageBufferTools.cpp
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+++ b/Source/WebCore/rendering/SVGImageBufferTools.cpp
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+/*
+    Copyright (C) Research In Motion Limited 2010. All rights reserved.
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include "config.h"
+
+#if ENABLE(SVG)
+#include "SVGImageBufferTools.h"
+
+#include "FrameView.h"
+#include "GraphicsContext.h"
+#include "RenderObject.h"
+#include "RenderSVGContainer.h"
+#include "RenderSVGRoot.h"
+
+namespace WebCore {
+
+static AffineTransform& currentContentTransformation()
+{
+    DEFINE_STATIC_LOCAL(AffineTransform, s_currentContentTransformation, ());
+    return s_currentContentTransformation;
+}
+
+void SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(const RenderObject* renderer, AffineTransform& absoluteTransform)
+{
+    const RenderObject* current = renderer;
+    ASSERT(current);
+
+    absoluteTransform = currentContentTransformation();
+    while (current) {
+        absoluteTransform.multiply(current->localToParentTransform());
+        if (current->isSVGRoot())
+            break;
+        current = current->parent();
+    }
+}
+
+bool SVGImageBufferTools::createImageBuffer(const FloatRect& absoluteTargetRect, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ColorSpace colorSpace)
+{
+    IntSize imageSize(roundedImageBufferSize(clampedAbsoluteTargetRect.size()));
+    IntSize unclampedImageSize(SVGImageBufferTools::roundedImageBufferSize(absoluteTargetRect.size()));
+
+    // Don't create empty ImageBuffers.
+    if (imageSize.isEmpty())
+        return false;
+
+    OwnPtr<ImageBuffer> image = ImageBuffer::create(imageSize, colorSpace);
+    if (!image)
+        return false;
+
+    GraphicsContext* imageContext = image->context();
+    ASSERT(imageContext);
+
+    // Compensate rounding effects, as the absolute target rect is using floating-point numbers and the image buffer size is integer.
+    imageContext->scale(FloatSize(unclampedImageSize.width() / absoluteTargetRect.width(), unclampedImageSize.height() / absoluteTargetRect.height()));
+
+    imageBuffer = image.release();
+    return true;
+}
+
+void SVGImageBufferTools::renderSubtreeToImageBuffer(ImageBuffer* image, RenderObject* item, const AffineTransform& subtreeContentTransformation)
+{
+    ASSERT(item);
+    ASSERT(image);
+    ASSERT(image->context());
+
+    PaintInfo info(image->context(), PaintInfo::infiniteRect(), PaintPhaseForeground, 0, 0, 0);
+
+    AffineTransform& contentTransformation = currentContentTransformation();
+    AffineTransform savedContentTransformation = contentTransformation;
+    contentTransformation.multiply(subtreeContentTransformation);
+
+    item->layoutIfNeeded();
+    item->paint(info, 0, 0);
+
+    contentTransformation = savedContentTransformation;
+}
+
+void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& clampedAbsoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer)
+{
+    ASSERT(context);
+    ASSERT(imageBuffer);
+
+    // The mask image has been created in the absolute coordinate space, as the image should not be scaled.
+    // So the actual masking process has to be done in the absolute coordinate space as well.
+    context->concatCTM(absoluteTransform.inverse());
+    context->clipToImageBuffer(imageBuffer.get(), clampedAbsoluteTargetRect);
+    context->concatCTM(absoluteTransform);
+
+    // When nesting resources, with objectBoundingBox as content unit types, there's no use in caching the
+    // resulting image buffer as the parent resource already caches the result.
+    if (!currentContentTransformation().isIdentity())
+        imageBuffer.clear();
+}
+
+IntSize SVGImageBufferTools::roundedImageBufferSize(const FloatSize& size)
+{
+    return IntSize(static_cast<int>(lroundf(size.width())), static_cast<int>(lroundf(size.height())));
+}
+
+FloatRect SVGImageBufferTools::clampedAbsoluteTargetRectForRenderer(const RenderObject* renderer, const FloatRect& absoluteTargetRect)
+{
+    ASSERT(renderer);
+
+    const RenderSVGRoot* svgRoot = SVGRenderSupport::findTreeRootObject(renderer);
+    FloatRect clampedAbsoluteTargetRect = absoluteTargetRect;
+    clampedAbsoluteTargetRect.intersect(svgRoot->contentBoxRect());
+    return clampedAbsoluteTargetRect;
+}
+
+}
+
+#endif // ENABLE(SVG)