/* -*- 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/. */ #include "nsSMILValue.h" #include "nsDebug.h" #include <string.h> //---------------------------------------------------------------------- // Public methods nsSMILValue::nsSMILValue(const nsISMILType* aType) : mType(nsSMILNullType::Singleton()) { if (!aType) { NS_ERROR("Trying to construct nsSMILValue with null mType pointer"); return; } InitAndCheckPostcondition(aType); } nsSMILValue::nsSMILValue(const nsSMILValue& aVal) : mType(nsSMILNullType::Singleton()) { InitAndCheckPostcondition(aVal.mType); mType->Assign(*this, aVal); } const nsSMILValue& nsSMILValue::operator=(const nsSMILValue& aVal) { if (&aVal == this) return *this; if (mType != aVal.mType) { DestroyAndReinit(aVal.mType); } mType->Assign(*this, aVal); return *this; } // Move constructor / reassignment operator: nsSMILValue::nsSMILValue(nsSMILValue&& aVal) : mU(aVal.mU), // Copying union is only OK because we clear aVal.mType below. mType(aVal.mType) { // Leave aVal with a null type, so that it's safely destructible (and won't // mess with anything referenced by its union, which we've copied). aVal.mType = nsSMILNullType::Singleton(); } nsSMILValue& nsSMILValue::operator=(nsSMILValue&& aVal) { if (!IsNull()) { // Clean up any data we're currently tracking. DestroyAndCheckPostcondition(); } // Copy the union (which could include a pointer to external memory) & mType: mU = aVal.mU; mType = aVal.mType; // Leave aVal with a null type, so that it's safely destructible (and won't // mess with anything referenced by its union, which we've now copied). aVal.mType = nsSMILNullType::Singleton(); return *this; } bool nsSMILValue::operator==(const nsSMILValue& aVal) const { if (&aVal == this) return true; return mType == aVal.mType && mType->IsEqual(*this, aVal); } nsresult nsSMILValue::Add(const nsSMILValue& aValueToAdd, uint32_t aCount) { if (aValueToAdd.mType != mType) { NS_ERROR("Trying to add incompatible types"); return NS_ERROR_FAILURE; } return mType->Add(*this, aValueToAdd, aCount); } nsresult nsSMILValue::SandwichAdd(const nsSMILValue& aValueToAdd) { if (aValueToAdd.mType != mType) { NS_ERROR("Trying to add incompatible types"); return NS_ERROR_FAILURE; } return mType->SandwichAdd(*this, aValueToAdd); } nsresult nsSMILValue::ComputeDistance(const nsSMILValue& aTo, double& aDistance) const { if (aTo.mType != mType) { NS_ERROR("Trying to calculate distance between incompatible types"); return NS_ERROR_FAILURE; } return mType->ComputeDistance(*this, aTo, aDistance); } nsresult nsSMILValue::Interpolate(const nsSMILValue& aEndVal, double aUnitDistance, nsSMILValue& aResult) const { if (aEndVal.mType != mType) { NS_ERROR("Trying to interpolate between incompatible types"); return NS_ERROR_FAILURE; } if (aResult.mType != mType) { // Outparam has wrong type aResult.DestroyAndReinit(mType); } return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult); } //---------------------------------------------------------------------- // Helper methods // Wrappers for nsISMILType::Init & ::Destroy that verify their postconditions void nsSMILValue::InitAndCheckPostcondition(const nsISMILType* aNewType) { aNewType->Init(*this); MOZ_ASSERT(mType == aNewType, "Post-condition of Init failed. nsSMILValue is invalid"); } void nsSMILValue::DestroyAndCheckPostcondition() { mType->Destroy(*this); MOZ_ASSERT(IsNull(), "Post-condition of Destroy failed. " "nsSMILValue not null after destroying"); } void nsSMILValue::DestroyAndReinit(const nsISMILType* aNewType) { DestroyAndCheckPostcondition(); InitAndCheckPostcondition(aNewType); }