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80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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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#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 false
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// more than you'd expect) - see comment above nsISMILType::IsEqual.
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bool operator==(const nsSMILValue& aVal) const;
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bool operator!=(const nsSMILValue& aVal) const {
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return !(*this == aVal);
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}
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bool 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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bool 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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