162 lines
4.0 KiB
C++
162 lines
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "nsSMILValue.h"
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#include "nsDebug.h"
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#include <string.h>
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//----------------------------------------------------------------------
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// Public methods
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nsSMILValue::nsSMILValue(const nsISMILType* aType)
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: mType(nsSMILNullType::Singleton())
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{
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if (!aType) {
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NS_ERROR("Trying to construct nsSMILValue with null mType pointer");
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return;
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}
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InitAndCheckPostcondition(aType);
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}
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nsSMILValue::nsSMILValue(const nsSMILValue& aVal)
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: mType(nsSMILNullType::Singleton())
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{
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InitAndCheckPostcondition(aVal.mType);
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mType->Assign(*this, aVal);
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}
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const nsSMILValue&
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nsSMILValue::operator=(const nsSMILValue& aVal)
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{
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if (&aVal == this)
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return *this;
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if (mType != aVal.mType) {
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DestroyAndReinit(aVal.mType);
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}
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mType->Assign(*this, aVal);
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return *this;
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}
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// Move constructor / reassignment operator:
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nsSMILValue::nsSMILValue(nsSMILValue&& aVal)
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: mU(aVal.mU), // Copying union is only OK because we clear aVal.mType below.
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mType(aVal.mType)
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{
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// Leave aVal with a null type, so that it's safely destructible (and won't
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// mess with anything referenced by its union, which we've copied).
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aVal.mType = nsSMILNullType::Singleton();
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}
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nsSMILValue&
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nsSMILValue::operator=(nsSMILValue&& aVal)
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{
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if (!IsNull()) {
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// Clean up any data we're currently tracking.
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DestroyAndCheckPostcondition();
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}
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// Copy the union (which could include a pointer to external memory) & mType:
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mU = aVal.mU;
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mType = aVal.mType;
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// Leave aVal with a null type, so that it's safely destructible (and won't
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// mess with anything referenced by its union, which we've now copied).
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aVal.mType = nsSMILNullType::Singleton();
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return *this;
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}
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bool
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nsSMILValue::operator==(const nsSMILValue& aVal) const
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{
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if (&aVal == this)
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return true;
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return mType == aVal.mType && mType->IsEqual(*this, aVal);
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}
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nsresult
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nsSMILValue::Add(const nsSMILValue& aValueToAdd, uint32_t aCount)
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{
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if (aValueToAdd.mType != mType) {
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NS_ERROR("Trying to add incompatible types");
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return NS_ERROR_FAILURE;
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}
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return mType->Add(*this, aValueToAdd, aCount);
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}
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nsresult
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nsSMILValue::SandwichAdd(const nsSMILValue& aValueToAdd)
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{
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if (aValueToAdd.mType != mType) {
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NS_ERROR("Trying to add incompatible types");
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return NS_ERROR_FAILURE;
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}
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return mType->SandwichAdd(*this, aValueToAdd);
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}
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nsresult
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nsSMILValue::ComputeDistance(const nsSMILValue& aTo, double& aDistance) const
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{
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if (aTo.mType != mType) {
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NS_ERROR("Trying to calculate distance between incompatible types");
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return NS_ERROR_FAILURE;
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}
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return mType->ComputeDistance(*this, aTo, aDistance);
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}
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nsresult
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nsSMILValue::Interpolate(const nsSMILValue& aEndVal,
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double aUnitDistance,
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nsSMILValue& aResult) const
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{
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if (aEndVal.mType != mType) {
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NS_ERROR("Trying to interpolate between incompatible types");
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return NS_ERROR_FAILURE;
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}
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if (aResult.mType != mType) {
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// Outparam has wrong type
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aResult.DestroyAndReinit(mType);
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}
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return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult);
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}
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//----------------------------------------------------------------------
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// Helper methods
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// Wrappers for nsISMILType::Init & ::Destroy that verify their postconditions
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void
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nsSMILValue::InitAndCheckPostcondition(const nsISMILType* aNewType)
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{
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aNewType->Init(*this);
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MOZ_ASSERT(mType == aNewType,
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"Post-condition of Init failed. nsSMILValue is invalid");
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}
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void
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nsSMILValue::DestroyAndCheckPostcondition()
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{
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mType->Destroy(*this);
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MOZ_ASSERT(IsNull(),
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"Post-condition of Destroy failed. "
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"nsSMILValue not null after destroying");
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}
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void
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nsSMILValue::DestroyAndReinit(const nsISMILType* aNewType)
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{
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DestroyAndCheckPostcondition();
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InitAndCheckPostcondition(aNewType);
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}
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