SMILValue.h (2537B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 /* This Source Code Form is subject to the terms of the Mozilla Public 4 * License, v. 2.0. If a copy of the MPL was not distributed with this 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ 6 7 #ifndef DOM_SMIL_SMILVALUE_H_ 8 #define DOM_SMIL_SMILVALUE_H_ 9 10 #include "mozilla/SMILNullType.h" 11 #include "mozilla/SMILType.h" 12 13 namespace mozilla { 14 15 /** 16 * Although objects of this type are generally only created on the stack and 17 * only exist during the taking of a new time sample, that's not always the 18 * case. The SMILValue objects obtained from attributes' base values are 19 * cached so that the SMIL engine can make certain optimizations during a 20 * sample if the base value has not changed since the last sample (potentially 21 * avoiding recomposing). These SMILValue objects typically live much longer 22 * than a single sample. 23 */ 24 class SMILValue { 25 public: 26 SMILValue() : mU(), mType(SMILNullType::Singleton()) {} 27 explicit SMILValue(const SMILType* aType); 28 SMILValue(const SMILValue& aVal); 29 30 ~SMILValue() { mType->DestroyValue(*this); } 31 32 const SMILValue& operator=(const SMILValue& aVal); 33 34 // Move constructor / reassignment operator: 35 SMILValue(SMILValue&& aVal) noexcept; 36 SMILValue& operator=(SMILValue&& aVal) noexcept; 37 38 // Equality operators. These are allowed to be conservative (return false 39 // more than you'd expect) - see comment above SMILType::IsEqual. 40 bool operator==(const SMILValue& aVal) const; 41 bool operator!=(const SMILValue& aVal) const { return !(*this == aVal); } 42 43 bool IsNull() const { return (mType == SMILNullType::Singleton()); } 44 45 nsresult Add(const SMILValue& aValueToAdd, uint32_t aCount = 1); 46 nsresult SandwichAdd(const SMILValue& aValueToAdd); 47 nsresult ComputeDistance(const SMILValue& aTo, double& aDistance) const; 48 nsresult Interpolate(const SMILValue& aEndVal, double aUnitDistance, 49 SMILValue& aResult) const; 50 51 union { 52 bool mBool; 53 uint64_t mUint; 54 int64_t mInt; 55 double mDouble; 56 struct { 57 float mAngle; 58 uint16_t mUnit; 59 uint16_t mOrientType; 60 } mOrient; 61 int32_t mIntPair[2]; 62 float mNumberPair[2]; 63 void* mPtr; 64 } mU; 65 const SMILType* mType; 66 67 protected: 68 void InitAndCheckPostcondition(const SMILType* aNewType); 69 void DestroyAndCheckPostcondition(); 70 void DestroyAndReinit(const SMILType* aNewType); 71 }; 72 73 } // namespace mozilla 74 75 #endif // DOM_SMIL_SMILVALUE_H_