dom/smil/SMILFloatType.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 "SMILFloatType.h"
   8
   9 #include "mozilla/SMILValue.h"
  10 #include "nsDebug.h"
  11 #include <math.h>
  12
  13 namespace mozilla {
  14
  15 void SMILFloatType::Init(SMILValue& aValue) const {
  16   MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
  17   aValue.mU.mDouble = 0.0;
  18   aValue.mType = this;
  19 }
  20
  21 void SMILFloatType::Destroy(SMILValue& aValue) const {
  22   MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value");
  23   aValue.mU.mDouble = 0.0;
  24   aValue.mType = SMILNullType::Singleton();
  25 }
  26
  27 nsresult SMILFloatType::Assign(SMILValue& aDest, const SMILValue& aSrc) const {
  28   MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  29   MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value");
  30   aDest.mU.mDouble = aSrc.mU.mDouble;
  31   return NS_OK;
  32 }
  33
  34 bool SMILFloatType::IsEqual(const SMILValue& aLeft,
  35                             const SMILValue& aRight) const {
  36   MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  37   MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
  38
  39   return aLeft.mU.mDouble == aRight.mU.mDouble;
  40 }
  41
  42 nsresult SMILFloatType::Add(SMILValue& aDest, const SMILValue& aValueToAdd,
  43                             uint32_t aCount) const {
  44   MOZ_ASSERT(aValueToAdd.mType == aDest.mType, "Trying to add invalid types");
  45   MOZ_ASSERT(aValueToAdd.mType == this, "Unexpected source type");
  46   aDest.mU.mDouble += aValueToAdd.mU.mDouble * aCount;
  47   return NS_OK;
  48 }
  49
  50 nsresult SMILFloatType::ComputeDistance(const SMILValue& aFrom,
  51                                         const SMILValue& aTo,
  52                                         double& aDistance) const {
  53   MOZ_ASSERT(aFrom.mType == aTo.mType, "Trying to compare different types");
  54   MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
  55
  56   const double& from = aFrom.mU.mDouble;
  57   const double& to = aTo.mU.mDouble;
  58
  59   aDistance = fabs(to - from);
  60
  61   return NS_OK;
  62 }
  63
  64 nsresult SMILFloatType::Interpolate(const SMILValue& aStartVal,
  65                                     const SMILValue& aEndVal,
  66                                     double aUnitDistance,
  67                                     SMILValue& aResult) const {
  68   MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
  69              "Trying to interpolate different types");
  70   MOZ_ASSERT(aStartVal.mType == this, "Unexpected types for interpolation");
  71   MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
  72
  73   const double& startVal = aStartVal.mU.mDouble;
  74   const double& endVal = aEndVal.mU.mDouble;
  75
  76   aResult.mU.mDouble = (startVal + (endVal - startVal) * aUnitDistance);
  77
  78   return NS_OK;
  79 }
  80
  81 }  // namespace mozilla