/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the Mozilla SVG project.
 *
 * The Initial Developer of the Original Code is the Mozilla Corporation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Daniel Holbert <dholbert@mozilla.com>
 *
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 * either of the GNU General Public License Version 2 or later (the "GPL"),
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/* implementation of nsISMILType for use by <animateMotion> element */

#ifndef MOZILLA_SVGMOTIONSMILTYPE_H_
#define MOZILLA_SVGMOTIONSMILTYPE_H_

#include "nsISMILType.h"
#include "gfxMatrix.h"
#include "nsTArray.h"
class nsSVGPathElement;
class nsSMILValue;
class gfxFlattenedPath;

namespace mozilla {

/**
 * 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
{
public:
  // Singleton for nsSMILValue objects to hold onto.
  static SVGMotionSMILType sSingleton;

protected:
  // nsISMILType Methods
  // -------------------
  virtual void     Init(nsSMILValue& aValue) const;
  virtual void     Destroy(nsSMILValue& aValue) const;
  virtual nsresult Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const;
  virtual PRBool   IsEqual(const nsSMILValue& aLeft,
                           const nsSMILValue& aRight) const;
  virtual nsresult Add(nsSMILValue& aDest,
                       const nsSMILValue& aValueToAdd,
                       PRUint32 aCount) const;
  virtual nsresult SandwichAdd(nsSMILValue& aDest,
                               const nsSMILValue& aValueToAdd) const;
  virtual nsresult ComputeDistance(const nsSMILValue& aFrom,
                                   const nsSMILValue& aTo,
                                   double& aDistance) const;
  virtual nsresult Interpolate(const nsSMILValue& aStartVal,
                               const nsSMILValue& aEndVal,
                               double aUnitDistance,
                               nsSMILValue& aResult) const;
public:
  // Used to generate a transform matrix from an <animateMotion> nsSMILValue.
  static gfxMatrix CreateMatrix(const nsSMILValue& aSMILVal);

  // Used to generate a nsSMILValue for the point at the given distance along
  // the given path.
  static nsSMILValue ConstructSMILValue(gfxFlattenedPath* aPath,
                                        float aDist,
                                        RotateType aRotateType,
                                        float aRotateAngle);

private:
  // Private constructor & destructor: prevent instances beyond my singleton,
  // and prevent others from deleting my singleton.
  SVGMotionSMILType()  {}
  ~SVGMotionSMILType() {}
};

} // namespace mozilla

#endif // MOZILLA_SVGMOTIONSMILTYPE_H_
