1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/smil/nsSMILValue.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,79 @@
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 +#ifndef NS_SMILVALUE_H_
1.10 +#define NS_SMILVALUE_H_
1.11 +
1.12 +#include "nsISMILType.h"
1.13 +#include "nsSMILNullType.h"
1.14 +
1.15 +/**
1.16 + * Although objects of this type are generally only created on the stack and
1.17 + * only exist during the taking of a new time sample, that's not always the
1.18 + * case. The nsSMILValue objects obtained from attributes' base values are
1.19 + * cached so that the SMIL engine can make certain optimizations during a
1.20 + * sample if the base value has not changed since the last sample (potentially
1.21 + * avoiding recomposing). These nsSMILValue objects typically live much longer
1.22 + * than a single sample.
1.23 + */
1.24 +class nsSMILValue
1.25 +{
1.26 +public:
1.27 + nsSMILValue() : mU(), mType(nsSMILNullType::Singleton()) { }
1.28 + explicit nsSMILValue(const nsISMILType* aType);
1.29 + nsSMILValue(const nsSMILValue& aVal);
1.30 +
1.31 + ~nsSMILValue()
1.32 + {
1.33 + mType->Destroy(*this);
1.34 + }
1.35 +
1.36 + const nsSMILValue& operator=(const nsSMILValue& aVal);
1.37 +
1.38 + // Equality operators. These are allowed to be conservative (return false
1.39 + // more than you'd expect) - see comment above nsISMILType::IsEqual.
1.40 + bool operator==(const nsSMILValue& aVal) const;
1.41 + bool operator!=(const nsSMILValue& aVal) const {
1.42 + return !(*this == aVal);
1.43 + }
1.44 +
1.45 + bool IsNull() const
1.46 + {
1.47 + return (mType == nsSMILNullType::Singleton());
1.48 + }
1.49 +
1.50 + // Swaps the member data (mU & mPtr) of |this| with |aOther|
1.51 + void Swap(nsSMILValue& aOther);
1.52 +
1.53 + nsresult Add(const nsSMILValue& aValueToAdd, uint32_t aCount = 1);
1.54 + nsresult SandwichAdd(const nsSMILValue& aValueToAdd);
1.55 + nsresult ComputeDistance(const nsSMILValue& aTo, double& aDistance) const;
1.56 + nsresult Interpolate(const nsSMILValue& aEndVal,
1.57 + double aUnitDistance,
1.58 + nsSMILValue& aResult) const;
1.59 +
1.60 + union {
1.61 + bool mBool;
1.62 + uint64_t mUint;
1.63 + int64_t mInt;
1.64 + double mDouble;
1.65 + struct {
1.66 + float mAngle;
1.67 + uint16_t mUnit;
1.68 + uint16_t mOrientType;
1.69 + } mOrient;
1.70 + int32_t mIntPair[2];
1.71 + float mNumberPair[2];
1.72 + void* mPtr;
1.73 + } mU;
1.74 + const nsISMILType* mType;
1.75 +
1.76 +protected:
1.77 + void InitAndCheckPostcondition(const nsISMILType* aNewType);
1.78 + void DestroyAndCheckPostcondition();
1.79 + void DestroyAndReinit(const nsISMILType* aNewType);
1.80 +};
1.81 +
1.82 +#endif // NS_SMILVALUE_H_
