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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef DOM_SMIL_SMILVALUE_H_
#define DOM_SMIL_SMILVALUE_H_
#include "mozilla/SMILNullType.h"
#include "mozilla/SMILType.h"
namespace mozilla {
/**
* Although objects of this type are generally only created on the stack and
* only exist during the taking of a new time sample, that's not always the
* case. The SMILValue objects obtained from attributes' base values are
* cached so that the SMIL engine can make certain optimizations during a
* sample if the base value has not changed since the last sample (potentially
* avoiding recomposing). These SMILValue objects typically live much longer
* than a single sample.
*/
class SMILValue {
public:
SMILValue() : mU(), mType(SMILNullType::Singleton()) {}
explicit SMILValue(const SMILType* aType);
SMILValue(const SMILValue& aVal);
~SMILValue() { mType->Destroy(*this); }
const SMILValue& operator=(const SMILValue& aVal);
// Move constructor / reassignment operator:
SMILValue(SMILValue&& aVal) noexcept;
SMILValue& operator=(SMILValue&& aVal) noexcept;
// Equality operators. These are allowed to be conservative (return false
// more than you'd expect) - see comment above SMILType::IsEqual.
bool operator==(const SMILValue& aVal) const;
bool operator!=(const SMILValue& aVal) const { return !(*this == aVal); }
bool IsNull() const { return (mType == SMILNullType::Singleton()); }
nsresult Add(const SMILValue& aValueToAdd, uint32_t aCount = 1);
nsresult SandwichAdd(const SMILValue& aValueToAdd);
nsresult ComputeDistance(const SMILValue& aTo, double& aDistance) const;
nsresult Interpolate(const SMILValue& aEndVal, double aUnitDistance,
SMILValue& aResult) const;
union {
bool mBool;
uint64_t mUint;
int64_t mInt;
double mDouble;
struct {
float mAngle;
uint16_t mUnit;
uint16_t mOrientType;
} mOrient;
int32_t mIntPair[2];
float mNumberPair[2];
void* mPtr;
} mU;
const SMILType* mType;
protected:
void InitAndCheckPostcondition(const SMILType* aNewType);
void DestroyAndCheckPostcondition();
void DestroyAndReinit(const SMILType* aNewType);
};
} // namespace mozilla
#endif // DOM_SMIL_SMILVALUE_H_
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