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113 lines
4.0 KiB
C++
113 lines
4.0 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 SMIL module.
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*
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* The Initial Developer of the Original Code is Brian Birtles.
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* Portions created by the Initial Developer are Copyright (C) 2006
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Robert O'Callahan <roc+moz@cs.cmu.edu>
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* Brian Birtles <birtles@gmail.com>
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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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#ifndef NS_SMILVALUE_H_
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#define NS_SMILVALUE_H_
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#include "nsISMILType.h"
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#include "nsSMILNullType.h"
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/**
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* Although objects of this type are generally only created on the stack and
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* only exist during the taking of a new time sample, that's not always the
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* case. The nsSMILValue objects obtained from attributes' base values are
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* cached so that the SMIL engine can make certain optimizations during a
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* sample if the base value has not changed since the last sample (potentially
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* avoiding recomposing). These nsSMILValue objects typically live much longer
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* than a single sample.
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*/
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class nsSMILValue
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{
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public:
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nsSMILValue() : mU(), mType(&nsSMILNullType::sSingleton) { }
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explicit nsSMILValue(const nsISMILType* aType);
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nsSMILValue(const nsSMILValue& aVal);
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~nsSMILValue()
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{
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mType->Destroy(*this);
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}
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const nsSMILValue& operator=(const nsSMILValue& aVal);
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// Equality operators. These are allowed to be conservative (return PR_FALSE
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// more than you'd expect) - see comment above nsISMILType::IsEqual.
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PRBool operator==(const nsSMILValue& aVal) const;
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PRBool operator!=(const nsSMILValue& aVal) const {
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return !(*this == aVal);
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}
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PRBool IsNull() const
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{
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return (mType == &nsSMILNullType::sSingleton);
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}
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// Swaps the member data (mU & mPtr) of |this| with |aOther|
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void Swap(nsSMILValue& aOther);
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nsresult Add(const nsSMILValue& aValueToAdd, PRUint32 aCount = 1);
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nsresult SandwichAdd(const nsSMILValue& aValueToAdd);
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nsresult ComputeDistance(const nsSMILValue& aTo, double& aDistance) const;
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nsresult Interpolate(const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const;
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union {
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PRBool mBool;
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PRUint64 mUint;
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PRInt64 mInt;
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double mDouble;
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struct {
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float mAngle;
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PRUint16 mUnit;
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PRUint16 mOrientType;
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} mOrient;
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PRInt32 mIntPair[2];
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float mNumberPair[2];
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void* mPtr;
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} mU;
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const nsISMILType* mType;
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protected:
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void InitAndCheckPostcondition(const nsISMILType* aNewType);
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void DestroyAndCheckPostcondition();
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void DestroyAndReinit(const nsISMILType* aNewType);
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};
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#endif // NS_SMILVALUE_H_
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