content/smil/SMILEnumType.cpp

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "SMILEnumType.h"
   7 #include "nsSMILValue.h"
   8 #include "nsDebug.h"
   9 #include <math.h>
  10
  11 namespace mozilla {
  12
  13 void
  14 SMILEnumType::Init(nsSMILValue& aValue) const
  15 {
  16   NS_PRECONDITION(aValue.IsNull(), "Unexpected value type");
  17   aValue.mU.mUint = 0;
  18   aValue.mType = this;
  19 }
  20
  21 void
  22 SMILEnumType::Destroy(nsSMILValue& aValue) const
  23 {
  24   NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
  25   aValue.mU.mUint = 0;
  26   aValue.mType = nsSMILNullType::Singleton();
  27 }
  28
  29 nsresult
  30 SMILEnumType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
  31 {
  32   NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  33   NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
  34   aDest.mU.mUint = aSrc.mU.mUint;
  35   return NS_OK;
  36 }
  37
  38 bool
  39 SMILEnumType::IsEqual(const nsSMILValue& aLeft,
  40                       const nsSMILValue& aRight) const
  41 {
  42   NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  43   NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
  44
  45   return aLeft.mU.mUint == aRight.mU.mUint;
  46 }
  47
  48 nsresult
  49 SMILEnumType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
  50                   uint32_t aCount) const
  51 {
  52   NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
  53                   "Trying to add invalid types");
  54   NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
  55   return NS_ERROR_FAILURE; // enum values can't be added to each other
  56 }
  57
  58 nsresult
  59 SMILEnumType::ComputeDistance(const nsSMILValue& aFrom,
  60                               const nsSMILValue& aTo,
  61                               double& aDistance) const
  62 {
  63   NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
  64   NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
  65   return NS_ERROR_FAILURE; // there is no concept of distance between enum values
  66 }
  67
  68 nsresult
  69 SMILEnumType::Interpolate(const nsSMILValue& aStartVal,
  70                           const nsSMILValue& aEndVal,
  71                           double aUnitDistance,
  72                           nsSMILValue& aResult) const
  73 {
  74   NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
  75       "Trying to interpolate different types");
  76   NS_PRECONDITION(aStartVal.mType == this,
  77       "Unexpected types for interpolation");
  78   NS_PRECONDITION(aResult.mType   == this, "Unexpected result type");
  79   return NS_ERROR_FAILURE; // enum values do not interpolate
  80 }
  81
  82 } // namespace mozilla