1 files changed, 86 insertions, 0 deletions
diff --git a/dom/svg/SVGMotionSMILType.h b/dom/svg/SVGMotionSMILType.h
new file mode 100644
index 000000000..7529d796d
--- /dev/null
+++ b/dom/svg/SVGMotionSMILType.h
@@ -0,0 +1,86 @@
+/* -*- 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/. */
+
+/* implementation of nsISMILType for use by <animateMotion> element */
+
+#ifndef MOZILLA_SVGMOTIONSMILTYPE_H_
+#define MOZILLA_SVGMOTIONSMILTYPE_H_
+
+#include "mozilla/gfx/2D.h"
+#include "mozilla/Attributes.h"
+#include "nsISMILType.h"
+
+class nsSMILValue;
+
+namespace mozilla {
+
+namespace gfx {
+class Matrix;
+} // namespace gfx
+
+/**
+ * MotionRotateType: Enum to indicate the type of our "rotate" attribute.
+ */
+enum RotateType {
+  eRotateType_Explicit,     // for e.g. rotate="45"/"45deg"/"0.785rad"
+  eRotateType_Auto,         // for rotate="auto"
+  eRotateType_AutoReverse   // for rotate="auto-reverse"
+};
+
+/**
+ * SVGMotionSMILType: Implements the nsISMILType interface for SMIL animations
+ * from <animateMotion>.
+ *
+ * NOTE: Even though there's technically no "motion" attribute, we behave in
+ * many ways as if there were, for simplicity.
+ */
+class SVGMotionSMILType : public nsISMILType
+{
+  typedef mozilla::gfx::Path Path;
+
+public:
+  // Singleton for nsSMILValue objects to hold onto.
+  static SVGMotionSMILType sSingleton;
+
+protected:
+  // nsISMILType Methods
+  // -------------------
+  virtual void     Init(nsSMILValue& aValue) const override;
+  virtual void     Destroy(nsSMILValue& aValue) const override;
+  virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const override;
+  virtual bool     IsEqual(const nsSMILValue& aLeft,
+                           const nsSMILValue& aRight) const override;
+  virtual nsresult Add(nsSMILValue& aDest,
+                       const nsSMILValue& aValueToAdd,
+                       uint32_t aCount) const override;
+  virtual nsresult SandwichAdd(nsSMILValue& aDest,
+                               const nsSMILValue& aValueToAdd) const override;
+  virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
+                                   const nsSMILValue& aTo,
+                                   double& aDistance) const override;
+  virtual nsresult Interpolate(const nsSMILValue& aStartVal,
+                               const nsSMILValue& aEndVal,
+                               double aUnitDistance,
+                               nsSMILValue& aResult) const override;
+public:
+  // Used to generate a transform matrix from an <animateMotion> nsSMILValue.
+  static gfx::Matrix CreateMatrix(const nsSMILValue& aSMILVal);
+
+  // Used to generate a nsSMILValue for the point at the given distance along
+  // the given path.
+  static nsSMILValue ConstructSMILValue(Path* aPath,
+                                        float aDist,
+                                        RotateType aRotateType,
+                                        float aRotateAngle);
+
+private:
+  // Private constructor: prevent instances beyond my singleton.
+  constexpr SVGMotionSMILType() {}
+};
+
+} // namespace mozilla
+
+#endif // MOZILLA_SVGMOTIONSMILTYPE_H_