michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "nsSMILFloatType.h"
michael@0: #include "nsSMILValue.h"
michael@0: #include "nsDebug.h"
michael@0: #include <math.h>
michael@0: 
michael@0: void
michael@0: nsSMILFloatType::Init(nsSMILValue& aValue) const
michael@0: {
michael@0:   NS_PRECONDITION(aValue.IsNull(), "Unexpected value type");
michael@0:   aValue.mU.mDouble = 0.0;
michael@0:   aValue.mType = this;
michael@0: }
michael@0: 
michael@0: void
michael@0: nsSMILFloatType::Destroy(nsSMILValue& aValue) const
michael@0: {
michael@0:   NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
michael@0:   aValue.mU.mDouble = 0.0;
michael@0:   aValue.mType      = nsSMILNullType::Singleton();
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSMILFloatType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
michael@0: {
michael@0:   NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
michael@0:   NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
michael@0:   aDest.mU.mDouble = aSrc.mU.mDouble;
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: bool
michael@0: nsSMILFloatType::IsEqual(const nsSMILValue& aLeft,
michael@0:                          const nsSMILValue& aRight) const
michael@0: {
michael@0:   NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
michael@0:   NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
michael@0: 
michael@0:   return aLeft.mU.mDouble == aRight.mU.mDouble;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSMILFloatType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
michael@0:                      uint32_t aCount) const
michael@0: {
michael@0:   NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
michael@0:                   "Trying to add invalid types");
michael@0:   NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
michael@0:   aDest.mU.mDouble += aValueToAdd.mU.mDouble * aCount;
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSMILFloatType::ComputeDistance(const nsSMILValue& aFrom,
michael@0:                                  const nsSMILValue& aTo,
michael@0:                                  double& aDistance) const
michael@0: {
michael@0:   NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
michael@0:   NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
michael@0: 
michael@0:   const double &from = aFrom.mU.mDouble;
michael@0:   const double &to   = aTo.mU.mDouble;
michael@0: 
michael@0:   aDistance = fabs(to - from);
michael@0: 
michael@0:   return NS_OK;
michael@0: }
michael@0: 
michael@0: nsresult
michael@0: nsSMILFloatType::Interpolate(const nsSMILValue& aStartVal,
michael@0:                              const nsSMILValue& aEndVal,
michael@0:                              double aUnitDistance,
michael@0:                              nsSMILValue& aResult) const
michael@0: {
michael@0:   NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
michael@0:       "Trying to interpolate different types");
michael@0:   NS_PRECONDITION(aStartVal.mType == this,
michael@0:       "Unexpected types for interpolation");
michael@0:   NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");
michael@0: 
michael@0:   const double &startVal = aStartVal.mU.mDouble;
michael@0:   const double &endVal   = aEndVal.mU.mDouble;
michael@0: 
michael@0:   aResult.mU.mDouble = (startVal + (endVal - startVal) * aUnitDistance);
michael@0: 
michael@0:   return NS_OK;
michael@0: }