100 lines
3.2 KiB
C++
100 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "SMILIntegerType.h"
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#include "nsSMILValue.h"
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#include "nsDebug.h"
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#include <math.h>
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namespace mozilla {
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void
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SMILIntegerType::Init(nsSMILValue& aValue) const
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{
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MOZ_ASSERT(aValue.IsNull(), "Unexpected value type");
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aValue.mU.mInt = 0;
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aValue.mType = this;
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}
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void
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SMILIntegerType::Destroy(nsSMILValue& aValue) const
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{
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NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
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aValue.mU.mInt = 0;
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aValue.mType = nsSMILNullType::Singleton();
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}
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nsresult
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SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
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{
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NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
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NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
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aDest.mU.mInt = aSrc.mU.mInt;
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return NS_OK;
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}
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bool
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SMILIntegerType::IsEqual(const nsSMILValue& aLeft,
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const nsSMILValue& aRight) const
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{
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NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
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NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
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return aLeft.mU.mInt == aRight.mU.mInt;
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}
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nsresult
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SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
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uint32_t aCount) const
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{
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NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
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"Trying to add invalid types");
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NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
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aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;
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return NS_OK;
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}
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nsresult
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SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,
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const nsSMILValue& aTo,
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double& aDistance) const
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{
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NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
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NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
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aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));
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return NS_OK;
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}
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nsresult
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SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,
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const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const
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{
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NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
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"Trying to interpolate different types");
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NS_PRECONDITION(aStartVal.mType == this,
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"Unexpected types for interpolation");
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NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
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const double startVal = double(aStartVal.mU.mInt);
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const double endVal = double(aEndVal.mU.mInt);
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const double currentVal = startVal + (endVal - startVal) * aUnitDistance;
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// When currentVal is exactly midway between its two nearest integers, we
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// jump to the "next" integer to provide simple, easy to remember and
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// consistent behaviour (from the SMIL author's point of view).
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if (startVal < endVal) {
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aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up
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} else {
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aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down
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}
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return NS_OK;
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}
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} // namespace mozilla
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