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