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diff --git a/dom/svg/SVGTransform.h b/dom/svg/SVGTransform.h
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+++ b/dom/svg/SVGTransform.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 DOM_SVG_SVGTRANSFORM_H_
+#define DOM_SVG_SVGTRANSFORM_H_
+
+#include "gfxMatrix.h"
+#include "mozilla/dom/SVGTransformBinding.h"
+#include "mozilla/gfx/Matrix.h"
+#include "nsDebug.h"
+
+namespace mozilla {
+
+/*
+ * The DOM wrapper class for this class is DOMSVGTransform.
+ */
+class SVGTransform {
+ public:
+  // Default ctor initialises to matrix type with identity matrix
+  SVGTransform()
+      : mMatrix()  // Initialises to identity
+        ,
+        mAngle(0.f),
+        mOriginX(0.f),
+        mOriginY(0.f),
+        mType(dom::SVGTransform_Binding::SVG_TRANSFORM_MATRIX) {}
+
+  explicit SVGTransform(const gfxMatrix& aMatrix)
+      : mMatrix(aMatrix),
+        mAngle(0.f),
+        mOriginX(0.f),
+        mOriginY(0.f),
+        mType(dom::SVGTransform_Binding::SVG_TRANSFORM_MATRIX) {}
+
+  bool operator==(const SVGTransform& rhs) const {
+    return mType == rhs.mType && MatricesEqual(mMatrix, rhs.mMatrix) &&
+           mAngle == rhs.mAngle && mOriginX == rhs.mOriginX &&
+           mOriginY == rhs.mOriginY;
+  }
+
+  void GetValueAsString(nsAString& aValue) const;
+
+  float Angle() const { return mAngle; }
+  void GetRotationOrigin(float& aOriginX, float& aOriginY) const {
+    aOriginX = mOriginX;
+    aOriginY = mOriginY;
+  }
+  uint16_t Type() const { return mType; }
+
+  const gfxMatrix& GetMatrix() const { return mMatrix; }
+  void SetMatrix(const gfxMatrix& aMatrix);
+  void SetTranslate(float aTx, float aTy);
+  void SetScale(float aSx, float aSy);
+  void SetRotate(float aAngle, float aCx, float aCy);
+  nsresult SetSkewX(float aAngle);
+  nsresult SetSkewY(float aAngle);
+
+  static bool MatricesEqual(const gfxMatrix& a, const gfxMatrix& b) {
+    return a._11 == b._11 && a._12 == b._12 && a._21 == b._21 &&
+           a._22 == b._22 && a._31 == b._31 && a._32 == b._32;
+  }
+
+ protected:
+  gfxMatrix mMatrix;
+  float mAngle, mOriginX, mOriginY;
+  uint16_t mType;
+};
+
+/*
+ * A slightly more light-weight version of SVGTransform for SMIL animation.
+ *
+ * Storing the parameters in an array (rather than a matrix) also allows simpler
+ * (transform type-agnostic) interpolation and addition.
+ *
+ * The meaning of the mParams array depends on the transform type as follows:
+ *
+ * Type                | mParams[0], mParams[1], mParams[2], ...
+ * --------------------+-----------------------------------------
+ * translate           | tx, ty
+ * scale               | sx, sy
+ * rotate              | rotation-angle (in degrees), cx, cy
+ * skewX               | skew-angle (in degrees)
+ * skewY               | skew-angle (in degrees)
+ * matrix              | a, b, c, d, e, f
+ *
+ * The matrix type is never generated by animation code (it is only produced
+ * when the user inserts one via the DOM) and often requires special handling
+ * when we do encounter it. Therefore many users of this class are only
+ * interested in the first three parameters and so we provide a special
+ * constructor for setting those parameters only.
+ */
+class SVGTransformSMILData {
+ public:
+  // Number of float-params required in constructor, if constructing one of the
+  // 'simple' transform types (all but matrix type)
+  static const uint32_t NUM_SIMPLE_PARAMS = 3;
+
+  // Number of float-params required in constructor for matrix type.
+  // This is also the number of params we actually store, regardless of type.
+  static const uint32_t NUM_STORED_PARAMS = 6;
+
+  explicit SVGTransformSMILData(uint16_t aType) : mTransformType(aType) {
+    MOZ_ASSERT(aType >= dom::SVGTransform_Binding::SVG_TRANSFORM_MATRIX &&
+                   aType <= dom::SVGTransform_Binding::SVG_TRANSFORM_SKEWY,
+               "Unexpected transform type");
+    for (uint32_t i = 0; i < NUM_STORED_PARAMS; ++i) {
+      mParams[i] = 0.f;
+    }
+  }
+
+  SVGTransformSMILData(uint16_t aType, float (&aParams)[NUM_SIMPLE_PARAMS])
+      : mTransformType(aType) {
+    MOZ_ASSERT(aType >= dom::SVGTransform_Binding::SVG_TRANSFORM_TRANSLATE &&
+                   aType <= dom::SVGTransform_Binding::SVG_TRANSFORM_SKEWY,
+               "Expected 'simple' transform type");
+    for (uint32_t i = 0; i < NUM_SIMPLE_PARAMS; ++i) {
+      mParams[i] = aParams[i];
+    }
+    for (uint32_t i = NUM_SIMPLE_PARAMS; i < NUM_STORED_PARAMS; ++i) {
+      mParams[i] = 0.f;
+    }
+  }
+
+  // Conversion to/from a fully-fledged SVGTransform
+  explicit SVGTransformSMILData(const SVGTransform& aTransform);
+  SVGTransform ToSVGTransform() const;
+
+  bool operator==(const SVGTransformSMILData& aOther) const {
+    if (mTransformType != aOther.mTransformType) return false;
+
+    for (uint32_t i = 0; i < NUM_STORED_PARAMS; ++i) {
+      if (mParams[i] != aOther.mParams[i]) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  bool operator!=(const SVGTransformSMILData& aOther) const {
+    return !(*this == aOther);
+  }
+
+  uint16_t mTransformType;
+  float mParams[NUM_STORED_PARAMS];
+};
+
+}  // namespace mozilla
+
+#endif  // DOM_SVG_SVGTRANSFORM_H_