Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=8 sts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       5             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : #include "SMILIntegerType.h"
       8             : #include "nsSMILValue.h"
       9             : #include "nsDebug.h"
      10             : #include <math.h>
      11             : 
      12             : namespace mozilla {
      13             : 
      14             : void
      15           0 : SMILIntegerType::Init(nsSMILValue& aValue) const
      16             : {
      17           0 :   MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
      18           0 :   aValue.mU.mInt = 0;
      19           0 :   aValue.mType = this;
      20           0 : }
      21             : 
      22             : void
      23           0 : SMILIntegerType::Destroy(nsSMILValue& aValue) const
      24             : {
      25           0 :   NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
      26           0 :   aValue.mU.mInt = 0;
      27           0 :   aValue.mType = nsSMILNullType::Singleton();
      28           0 : }
      29             : 
      30             : nsresult
      31           0 : SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
      32             : {
      33           0 :   NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
      34           0 :   NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
      35           0 :   aDest.mU.mInt = aSrc.mU.mInt;
      36           0 :   return NS_OK;
      37             : }
      38             : 
      39             : bool
      40           0 : SMILIntegerType::IsEqual(const nsSMILValue& aLeft,
      41             :                          const nsSMILValue& aRight) const
      42             : {
      43           0 :   NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
      44           0 :   NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
      45             : 
      46           0 :   return aLeft.mU.mInt == aRight.mU.mInt;
      47             : }
      48             : 
      49             : nsresult
      50           0 : SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
      51             :                      uint32_t aCount) const
      52             : {
      53           0 :   NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
      54             :                   "Trying to add invalid types");
      55           0 :   NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
      56           0 :   aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;
      57           0 :   return NS_OK;
      58             : }
      59             : 
      60             : nsresult
      61           0 : SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,
      62             :                                  const nsSMILValue& aTo,
      63             :                                  double& aDistance) const
      64             : {
      65           0 :   NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
      66           0 :   NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
      67           0 :   aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));
      68           0 :   return NS_OK;
      69             : }
      70             : 
      71             : nsresult
      72           0 : SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,
      73             :                              const nsSMILValue& aEndVal,
      74             :                              double aUnitDistance,
      75             :                              nsSMILValue& aResult) const
      76             : {
      77           0 :   NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
      78             :                   "Trying to interpolate different types");
      79           0 :   NS_PRECONDITION(aStartVal.mType == this,
      80             :                   "Unexpected types for interpolation");
      81           0 :   NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");
      82             : 
      83           0 :   const double startVal   = double(aStartVal.mU.mInt);
      84           0 :   const double endVal     = double(aEndVal.mU.mInt);
      85           0 :   const double currentVal = startVal + (endVal - startVal) * aUnitDistance;
      86             : 
      87             :   // When currentVal is exactly midway between its two nearest integers, we
      88             :   // jump to the "next" integer to provide simple, easy to remember and
      89             :   // consistent behaviour (from the SMIL author's point of view).
      90             : 
      91           0 :   if (startVal < endVal) {
      92           0 :     aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up
      93             :   } else {
      94           0 :     aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down
      95             :   }
      96             : 
      97           0 :   return NS_OK;
      98             : }
      99             : 
     100             : } // namespace mozilla