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133 lines
4.7 KiB
C++
133 lines
4.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Mozilla SVG project.
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*
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* The Initial Developer of the Original Code is the Mozilla Corporation.
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* Portions created by the Initial Developer are Copyright (C) 2009
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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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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/*static*/ SMILIntegerType SMILIntegerType::sSingleton;
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void
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SMILIntegerType::Init(nsSMILValue& aValue) const
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{
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NS_ABORT_IF_FALSE(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::sSingleton;
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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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PRUint32 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 = PRInt64(floor(currentVal + 0.5)); // round mid up
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} else {
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aResult.mU.mInt = PRInt64(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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