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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 DOM_SMIL_SMILVALUE_H_
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#define DOM_SMIL_SMILVALUE_H_
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#include "mozilla/SMILNullType.h"
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#include "mozilla/SMILType.h"
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namespace mozilla {
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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 SMILValue 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 SMILValue objects typically live much longer
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* than a single sample.
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*/
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class SMILValue {
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public:
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SMILValue() : mU(), mType(SMILNullType::Singleton()) {}
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explicit SMILValue(const SMILType* aType);
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SMILValue(const SMILValue& aVal);
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~SMILValue() { mType->Destroy(*this); }
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const SMILValue& operator=(const SMILValue& aVal);
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// Move constructor / reassignment operator:
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SMILValue(SMILValue&& aVal) noexcept;
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SMILValue& operator=(SMILValue&& aVal) noexcept;
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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 SMILType::IsEqual.
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bool operator==(const SMILValue& aVal) const;
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bool operator!=(const SMILValue& aVal) const { return !(*this == aVal); }
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bool IsNull() const { return (mType == SMILNullType::Singleton()); }
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nsresult Add(const SMILValue& aValueToAdd, uint32_t aCount = 1);
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nsresult SandwichAdd(const SMILValue& aValueToAdd);
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nsresult ComputeDistance(const SMILValue& aTo, double& aDistance) const;
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nsresult Interpolate(const SMILValue& aEndVal, double aUnitDistance,
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SMILValue& aResult) const;
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union {
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bool mBool;
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uint64_t mUint;
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int64_t mInt;
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double mDouble;
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struct {
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float mAngle;
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uint16_t mUnit;
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uint16_t mOrientType;
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} mOrient;
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int32_t 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 SMILType* mType;
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protected:
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void InitAndCheckPostcondition(const SMILType* aNewType);
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void DestroyAndCheckPostcondition();
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void DestroyAndReinit(const SMILType* aNewType);
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};
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} // namespace mozilla
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#endif // DOM_SMIL_SMILVALUE_H_
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