diff -r 000000000000 -r 6474c204b198 layout/base/GeometryUtils.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/base/GeometryUtils.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,66 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MOZILLA_GEOMETRYUTILS_H_
+#define MOZILLA_GEOMETRYUTILS_H_
+
+#include "mozilla/ErrorResult.h"
+#include "nsTArray.h"
+#include "nsCOMPtr.h"
+
+/**
+ * This file defines utility functions for converting between layout
+ * coordinate systems.
+ */
+
+class nsINode;
+class nsIDocument;
+
+namespace mozilla {
+
+namespace dom {
+struct BoxQuadOptions;
+struct ConvertCoordinateOptions;
+class DOMQuad;
+class DOMRectReadOnly;
+class DOMPoint;
+class DOMPointInit;
+class OwningTextOrElementOrDocument;
+class TextOrElementOrDocument;
+}
+
+typedef dom::TextOrElementOrDocument GeometryNode;
+typedef dom::OwningTextOrElementOrDocument OwningGeometryNode;
+
+/**
+ * Computes quads for aNode using aOptions, according to GeometryUtils.getBoxQuads.
+ * May set an error in aRv.
+ */
+void GetBoxQuads(nsINode* aNode,
+                 const dom::BoxQuadOptions& aOptions,
+                 nsTArray<nsRefPtr<dom::DOMQuad> >& aResult,
+                 ErrorResult& aRv);
+
+already_AddRefed<dom::DOMQuad>
+ConvertQuadFromNode(nsINode* aTo, dom::DOMQuad& aQuad,
+                    const GeometryNode& aFrom,
+                    const dom::ConvertCoordinateOptions& aOptions,
+                    ErrorResult& aRv);
+
+already_AddRefed<dom::DOMQuad>
+ConvertRectFromNode(nsINode* aTo, dom::DOMRectReadOnly& aRect,
+                    const GeometryNode& aFrom,
+                    const dom::ConvertCoordinateOptions& aOptions,
+                    ErrorResult& aRv);
+
+already_AddRefed<dom::DOMPoint>
+ConvertPointFromNode(nsINode* aTo, const dom::DOMPointInit& aPoint,
+                     const GeometryNode& aFrom,
+                     const dom::ConvertCoordinateOptions& aOptions,
+                     ErrorResult& aRv);
+
+}
+
+#endif /* MOZILLA_GEOMETRYUTILS_H_ */