dom/smil/SMILNullType.cpp

   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 "SMILNullType.h"
   8
   9 #include "mozilla/SMILValue.h"
  10 #include "nsDebug.h"
  11
  12 namespace mozilla {
  13
  14 /*static*/
  15 SMILNullType* SMILNullType::Singleton() {
  16   static SMILNullType sSingleton;
  17   return &sSingleton;
  18 }
  19
  20 nsresult SMILNullType::Assign(SMILValue& aDest, const SMILValue& aSrc) const {
  21   MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  22   MOZ_ASSERT(aSrc.mType == this, "Unexpected source type");
  23   aDest.mU = aSrc.mU;
  24   aDest.mType = Singleton();
  25   return NS_OK;
  26 }
  27
  28 bool SMILNullType::IsEqual(const SMILValue& aLeft,
  29                            const SMILValue& aRight) const {
  30   MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  31   MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
  32
  33   return true;  // All null-typed values are equivalent.
  34 }
  35
  36 nsresult SMILNullType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
  37                            uint32_t aCount) const {
  38   MOZ_ASSERT_UNREACHABLE("Adding NULL type");
  39   return NS_ERROR_FAILURE;
  40 }
  41
  42 nsresult SMILNullType::ComputeDistance(const SMILValue& aFrom,
  43                                        const SMILValue& aTo,
  44                                        double& aDistance) const {
  45   MOZ_ASSERT_UNREACHABLE("Computing distance for NULL type");
  46   return NS_ERROR_FAILURE;
  47 }
  48
  49 nsresult SMILNullType::Interpolate(const SMILValue& aStartVal,
  50                                    const SMILValue& aEndVal,
  51                                    double aUnitDistance,
  52                                    SMILValue& aResult) const {
  53   MOZ_ASSERT_UNREACHABLE("Interpolating NULL type");
  54   return NS_ERROR_FAILURE;
  55 }
  56
  57 }  // namespace mozilla