dom/svg/SVGNumberPairSMILType.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 "SVGNumberPairSMILType.h"
   8
   9 #include "mozilla/SMILValue.h"
  10 #include "nsMathUtils.h"
  11 #include "nsDebug.h"
  12
  13 namespace mozilla {
  14
  15 /*static*/
  16 SVGNumberPairSMILType SVGNumberPairSMILType::sSingleton;
  17
  18 void SVGNumberPairSMILType::Init(SMILValue& aValue) const {
  19   MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
  20
  21   aValue.mU.mNumberPair[0] = 0;
  22   aValue.mU.mNumberPair[1] = 0;
  23   aValue.mType = this;
  24 }
  25
  26 void SVGNumberPairSMILType::Destroy(SMILValue& aValue) const {
  27   MOZ_ASSERT(aValue.mType == this, "Unexpected SMIL value");
  28   aValue.mU.mNumberPair[0] = 0;
  29   aValue.mU.mNumberPair[1] = 0;
  30   aValue.mType = SMILNullType::Singleton();
  31 }
  32
  33 nsresult SVGNumberPairSMILType::Assign(SMILValue& aDest,
  34                                        const SMILValue& aSrc) const {
  35   MOZ_ASSERT(aDest.mType == aSrc.mType, "Incompatible SMIL types");
  36   MOZ_ASSERT(aDest.mType == this, "Unexpected SMIL value");
  37
  38   aDest.mU.mNumberPair[0] = aSrc.mU.mNumberPair[0];
  39   aDest.mU.mNumberPair[1] = aSrc.mU.mNumberPair[1];
  40   return NS_OK;
  41 }
  42
  43 bool SVGNumberPairSMILType::IsEqual(const SMILValue& aLeft,
  44                                     const SMILValue& aRight) const {
  45   MOZ_ASSERT(aLeft.mType == aRight.mType, "Incompatible SMIL types");
  46   MOZ_ASSERT(aLeft.mType == this, "Unexpected type for SMIL value");
  47
  48   return aLeft.mU.mNumberPair[0] == aRight.mU.mNumberPair[0] &&
  49          aLeft.mU.mNumberPair[1] == aRight.mU.mNumberPair[1];
  50 }
  51
  52 nsresult SVGNumberPairSMILType::Add(SMILValue& aDest,
  53                                     const SMILValue& aValueToAdd,
  54                                     uint32_t aCount) const {
  55   MOZ_ASSERT(aValueToAdd.mType == aDest.mType, "Trying to add invalid types");
  56   MOZ_ASSERT(aValueToAdd.mType == this, "Unexpected source type");
  57
  58   aDest.mU.mNumberPair[0] += aValueToAdd.mU.mNumberPair[0] * aCount;
  59   aDest.mU.mNumberPair[1] += aValueToAdd.mU.mNumberPair[1] * aCount;
  60
  61   return NS_OK;
  62 }
  63
  64 nsresult SVGNumberPairSMILType::ComputeDistance(const SMILValue& aFrom,
  65                                                 const SMILValue& aTo,
  66                                                 double& aDistance) const {
  67   MOZ_ASSERT(aFrom.mType == aTo.mType, "Trying to compare different types");
  68   MOZ_ASSERT(aFrom.mType == this, "Unexpected source type");
  69
  70   double delta[2];
  71   delta[0] = aTo.mU.mNumberPair[0] - aFrom.mU.mNumberPair[0];
  72   delta[1] = aTo.mU.mNumberPair[1] - aFrom.mU.mNumberPair[1];
  73
  74   aDistance = NS_hypot(delta[0], delta[1]);
  75   return NS_OK;
  76 }
  77
  78 nsresult SVGNumberPairSMILType::Interpolate(const SMILValue& aStartVal,
  79                                             const SMILValue& aEndVal,
  80                                             double aUnitDistance,
  81                                             SMILValue& aResult) const {
  82   MOZ_ASSERT(aStartVal.mType == aEndVal.mType,
  83              "Trying to interpolate different types");
  84   MOZ_ASSERT(aStartVal.mType == this, "Unexpected types for interpolation");
  85   MOZ_ASSERT(aResult.mType == this, "Unexpected result type");
  86
  87   aResult.mU.mNumberPair[0] =
  88       float(aStartVal.mU.mNumberPair[0] +
  89             (aEndVal.mU.mNumberPair[0] - aStartVal.mU.mNumberPair[0]) *
  90                 aUnitDistance);
  91   aResult.mU.mNumberPair[1] =
  92       float(aStartVal.mU.mNumberPair[1] +
  93             (aEndVal.mU.mNumberPair[1] - aStartVal.mU.mNumberPair[1]) *
  94                 aUnitDistance);
  95   return NS_OK;
  96 }
  97
  98 }  // namespace mozilla