1 files changed, 73 insertions, 0 deletions
diff --git a/WebCore/rendering/SVGImageBufferTools.cpp b/WebCore/rendering/SVGImageBufferTools.cpp
new file mode 100644
index 0000000..5b45ccc
--- /dev/null
+++ b/WebCore/rendering/SVGImageBufferTools.cpp
@@ -0,0 +1,73 @@
+/*
+    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 "GraphicsContext.h"
+#include "RenderObject.h"
+
+namespace WebCore {
+
+AffineTransform SVGImageBufferTools::absoluteTransformFromContext(GraphicsContext* context)
+{
+    // Extract current transformation matrix used in the original context. Note that this coordinate
+    // system is flipped compared to SVGs internal coordinate system, done in WebKit level. Fix
+    // this transformation by flipping the y component.
+    return context->getCTM() * AffineTransform().flipY();
+}
+
+bool SVGImageBufferTools::createImageBuffer(const AffineTransform& absoluteTransform, const FloatRect& absoluteTargetRect, OwnPtr<ImageBuffer>& imageBuffer, ImageColorSpace colorSpace)
+{
+    IntRect imageRect = enclosingIntRect(absoluteTargetRect);
+    if (imageRect.isEmpty())
+        return false;
+
+    // Allocate an image buffer as big as the absolute unclipped size of the object
+    OwnPtr<ImageBuffer> image = ImageBuffer::create(imageRect.size(), colorSpace);
+    if (!image)
+        return false;
+
+    GraphicsContext* imageContext = image->context();
+
+    // Transform the mask image coordinate system to absolute screen coordinates
+    imageContext->translate(-absoluteTargetRect.x(), -absoluteTargetRect.y());
+    imageContext->concatCTM(absoluteTransform);
+
+    imageBuffer = image.release();
+    return true;
+}
+
+void SVGImageBufferTools::clipToImageBuffer(GraphicsContext* context, const AffineTransform& absoluteTransform, const FloatRect& absoluteTargetRect, ImageBuffer* imageBuffer)
+{
+    ASSERT(context);
+    ASSERT(imageBuffer);
+
+    // The mask image has been created in the device coordinate space, as the image should not be scaled.
+    // So the actual masking process has to be done in the device coordinate space as well.
+    context->concatCTM(absoluteTransform.inverse());
+    context->clipToImageBuffer(imageBuffer, absoluteTargetRect);
+    context->concatCTM(absoluteTransform);
+}
+
+}
+
+#endif // ENABLE(SVG)