dom/smil/nsSMILNullType.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 "nsSMILNullType.h"
   7 #include "nsSMILValue.h"
   8 #include "nsDebug.h"
   9
  10 nsresult
  11 nsSMILNullType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
  12 {
  13   NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  14   NS_PRECONDITION(aSrc.mType == this, "Unexpected source type");
  15   aDest.mU    = aSrc.mU;
  16   aDest.mType = Singleton();
  17   return NS_OK;
  18 }
  19
  20 bool
  21 nsSMILNullType::IsEqual(const nsSMILValue& aLeft,
  22                         const nsSMILValue& aRight) const
  23 {
  24   NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  25   NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
  26
  27   return true;  // All null-typed values are equivalent.
  28 }
  29
  30 nsresult
  31 nsSMILNullType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
  32                     uint32_t aCount) const
  33 {
  34   NS_NOTREACHED("Adding NULL type");
  35   return NS_ERROR_FAILURE;
  36 }
  37
  38 nsresult
  39 nsSMILNullType::ComputeDistance(const nsSMILValue& aFrom,
  40                                 const nsSMILValue& aTo,
  41                                 double& aDistance) const
  42 {
  43   NS_NOTREACHED("Computing distance for NULL type");
  44   return NS_ERROR_FAILURE;
  45 }
  46
  47 nsresult
  48 nsSMILNullType::Interpolate(const nsSMILValue& aStartVal,
  49                             const nsSMILValue& aEndVal,
  50                             double aUnitDistance,
  51                             nsSMILValue& aResult) const
  52 {
  53   NS_NOTREACHED("Interpolating NULL type");
  54   return NS_ERROR_FAILURE;
  55 }