1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/smil/SMILIntegerType.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,99 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "SMILIntegerType.h"
1.10 +#include "nsSMILValue.h"
1.11 +#include "nsDebug.h"
1.12 +#include <math.h>
1.13 +
1.14 +namespace mozilla {
1.15 +
1.16 +void
1.17 +SMILIntegerType::Init(nsSMILValue& aValue) const
1.18 +{
1.19 + NS_ABORT_IF_FALSE(aValue.IsNull(), "Unexpected value type");
1.20 + aValue.mU.mInt = 0;
1.21 + aValue.mType = this;
1.22 +}
1.23 +
1.24 +void
1.25 +SMILIntegerType::Destroy(nsSMILValue& aValue) const
1.26 +{
1.27 + NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value");
1.28 + aValue.mU.mInt = 0;
1.29 + aValue.mType = nsSMILNullType::Singleton();
1.30 +}
1.31 +
1.32 +nsresult
1.33 +SMILIntegerType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
1.34 +{
1.35 + NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types");
1.36 + NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value");
1.37 + aDest.mU.mInt = aSrc.mU.mInt;
1.38 + return NS_OK;
1.39 +}
1.40 +
1.41 +bool
1.42 +SMILIntegerType::IsEqual(const nsSMILValue& aLeft,
1.43 + const nsSMILValue& aRight) const
1.44 +{
1.45 + NS_PRECONDITION(aLeft.mType == aRight.mType, "Incompatible SMIL types");
1.46 + NS_PRECONDITION(aLeft.mType == this, "Unexpected type for SMIL value");
1.47 +
1.48 + return aLeft.mU.mInt == aRight.mU.mInt;
1.49 +}
1.50 +
1.51 +nsresult
1.52 +SMILIntegerType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
1.53 + uint32_t aCount) const
1.54 +{
1.55 + NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
1.56 + "Trying to add invalid types");
1.57 + NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
1.58 + aDest.mU.mInt += aValueToAdd.mU.mInt * aCount;
1.59 + return NS_OK;
1.60 +}
1.61 +
1.62 +nsresult
1.63 +SMILIntegerType::ComputeDistance(const nsSMILValue& aFrom,
1.64 + const nsSMILValue& aTo,
1.65 + double& aDistance) const
1.66 +{
1.67 + NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
1.68 + NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
1.69 + aDistance = fabs(double(aTo.mU.mInt - aFrom.mU.mInt));
1.70 + return NS_OK;
1.71 +}
1.72 +
1.73 +nsresult
1.74 +SMILIntegerType::Interpolate(const nsSMILValue& aStartVal,
1.75 + const nsSMILValue& aEndVal,
1.76 + double aUnitDistance,
1.77 + nsSMILValue& aResult) const
1.78 +{
1.79 + NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
1.80 + "Trying to interpolate different types");
1.81 + NS_PRECONDITION(aStartVal.mType == this,
1.82 + "Unexpected types for interpolation");
1.83 + NS_PRECONDITION(aResult.mType == this, "Unexpected result type");
1.84 +
1.85 + const double startVal = double(aStartVal.mU.mInt);
1.86 + const double endVal = double(aEndVal.mU.mInt);
1.87 + const double currentVal = startVal + (endVal - startVal) * aUnitDistance;
1.88 +
1.89 + // When currentVal is exactly midway between its two nearest integers, we
1.90 + // jump to the "next" integer to provide simple, easy to remember and
1.91 + // consistent behaviour (from the SMIL author's point of view).
1.92 +
1.93 + if (startVal < endVal) {
1.94 + aResult.mU.mInt = int64_t(floor(currentVal + 0.5)); // round mid up
1.95 + } else {
1.96 + aResult.mU.mInt = int64_t(ceil(currentVal - 0.5)); // round mid down
1.97 + }
1.98 +
1.99 + return NS_OK;
1.100 +}
1.101 +
1.102 +} // namespace mozilla
