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comparison: dom/smil/nsSMILValue.h
dom/smil/nsSMILValue.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #ifndef NS_SMILVALUE_H_ | |
| 7 #define NS_SMILVALUE_H_ | |
| 8 | |
| 9 #include "nsISMILType.h" | |
| 10 #include "nsSMILNullType.h" | |
| 11 | |
| 12 /** | |
| 13 * Although objects of this type are generally only created on the stack and | |
| 14 * only exist during the taking of a new time sample, that's not always the | |
| 15 * case. The nsSMILValue objects obtained from attributes' base values are | |
| 16 * cached so that the SMIL engine can make certain optimizations during a | |
| 17 * sample if the base value has not changed since the last sample (potentially | |
| 18 * avoiding recomposing). These nsSMILValue objects typically live much longer | |
| 19 * than a single sample. | |
| 20 */ | |
| 21 class nsSMILValue | |
| 22 { | |
| 23 public: | |
| 24 nsSMILValue() : mU(), mType(nsSMILNullType::Singleton()) { } | |
| 25 explicit nsSMILValue(const nsISMILType* aType); | |
| 26 nsSMILValue(const nsSMILValue& aVal); | |
| 27 | |
| 28 ~nsSMILValue() | |
| 29 { | |
| 30 mType->Destroy(*this); | |
| 31 } | |
| 32 | |
| 33 const nsSMILValue& operator=(const nsSMILValue& aVal); | |
| 34 | |
| 35 // Equality operators. These are allowed to be conservative (return false | |
| 36 // more than you'd expect) - see comment above nsISMILType::IsEqual. | |
| 37 bool operator==(const nsSMILValue& aVal) const; | |
| 38 bool operator!=(const nsSMILValue& aVal) const { | |
| 39 return !(*this == aVal); | |
| 40 } | |
| 41 | |
| 42 bool IsNull() const | |
| 43 { | |
| 44 return (mType == nsSMILNullType::Singleton()); | |
| 45 } | |
| 46 | |
| 47 // Swaps the member data (mU & mPtr) of |this| with |aOther| | |
| 48 void Swap(nsSMILValue& aOther); | |
| 49 | |
| 50 nsresult Add(const nsSMILValue& aValueToAdd, uint32_t aCount = 1); | |
| 51 nsresult SandwichAdd(const nsSMILValue& aValueToAdd); | |
| 52 nsresult ComputeDistance(const nsSMILValue& aTo, double& aDistance) const; | |
| 53 nsresult Interpolate(const nsSMILValue& aEndVal, | |
| 54 double aUnitDistance, | |
| 55 nsSMILValue& aResult) const; | |
| 56 | |
| 57 union { | |
| 58 bool mBool; | |
| 59 uint64_t mUint; | |
| 60 int64_t mInt; | |
| 61 double mDouble; | |
| 62 struct { | |
| 63 float mAngle; | |
| 64 uint16_t mUnit; | |
| 65 uint16_t mOrientType; | |
| 66 } mOrient; | |
| 67 int32_t mIntPair[2]; | |
| 68 float mNumberPair[2]; | |
| 69 void* mPtr; | |
| 70 } mU; | |
| 71 const nsISMILType* mType; | |
| 72 | |
| 73 protected: | |
| 74 void InitAndCheckPostcondition(const nsISMILType* aNewType); | |
| 75 void DestroyAndCheckPostcondition(); | |
| 76 void DestroyAndReinit(const nsISMILType* aNewType); | |
| 77 }; | |
| 78 | |
| 79 #endif // NS_SMILVALUE_H_ |
