gecko-dev/content/smil/nsSMILFloatType.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Robert O'Callahan <roc+moz@cs.cmu.edu>
* Brian Birtles <birtles@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsSMILFloatType.h"
#include "nsSMILValue.h"
#include "nsDebug.h"
#include <math.h>
/*static*/ nsSMILFloatType nsSMILFloatType::sSingleton;
nsresult
nsSMILFloatType::Init(nsSMILValue& aValue) const
{
NS_PRECONDITION(aValue.mType == this || aValue.IsNull(),
"Unexpected value type");
aValue.mU.mDouble = 0.0;
aValue.mType = this;
return NS_OK;
}
void
nsSMILFloatType::Destroy(nsSMILValue& aValue) const
{
NS_PRECONDITION(aValue.mType == this, "Unexpected SMIL value.");
aValue.mU.mDouble = 0.0;
aValue.mType = &nsSMILNullType::sSingleton;
}
nsresult
nsSMILFloatType::Assign(nsSMILValue& aDest, const nsSMILValue& aSrc) const
{
NS_PRECONDITION(aDest.mType == aSrc.mType, "Incompatible SMIL types.");
NS_PRECONDITION(aDest.mType == this, "Unexpected SMIL value.");
aDest.mU.mDouble = aSrc.mU.mDouble;
return NS_OK;
}
nsresult
nsSMILFloatType::Add(nsSMILValue& aDest, const nsSMILValue& aValueToAdd,
PRUint32 aCount) const
{
NS_PRECONDITION(aValueToAdd.mType == aDest.mType,
"Trying to add invalid types");
NS_PRECONDITION(aValueToAdd.mType == this, "Unexpected source type");
aDest.mU.mDouble += aValueToAdd.mU.mDouble * aCount;
return NS_OK;
}
nsresult
nsSMILFloatType::ComputeDistance(const nsSMILValue& aFrom,
const nsSMILValue& aTo,
double& aDistance) const
{
NS_PRECONDITION(aFrom.mType == aTo.mType,"Trying to compare different types");
NS_PRECONDITION(aFrom.mType == this, "Unexpected source type");
const double &from = aFrom.mU.mDouble;
const double &to = aTo.mU.mDouble;
aDistance = fabs(to - from);
return NS_OK;
}
nsresult
nsSMILFloatType::Interpolate(const nsSMILValue& aStartVal,
const nsSMILValue& aEndVal,
double aUnitDistance,
nsSMILValue& aResult) const
{
NS_PRECONDITION(aStartVal.mType == aEndVal.mType,
"Trying to interpolate different types");
NS_PRECONDITION(aStartVal.mType == this,
"Unexpected types for interpolation.");
NS_PRECONDITION(aResult.mType == this, "Unexpected result type.");
const double &startVal = aStartVal.mU.mDouble;
const double &endVal = aEndVal.mU.mDouble;
aResult.mU.mDouble = (startVal + (endVal - startVal) * aUnitDistance);
return NS_OK;
}