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145 lines
3.6 KiB
C++
145 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; 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::sSingleton)
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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::sSingleton)
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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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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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void
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nsSMILValue::Swap(nsSMILValue& aOther)
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{
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nsSMILValue tmp;
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memcpy(&tmp, &aOther, sizeof(nsSMILValue)); // tmp = aOther
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memcpy(&aOther, this, sizeof(nsSMILValue)); // aOther = this
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memcpy(this, &tmp, sizeof(nsSMILValue)); // this = tmp
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// |tmp| is about to die -- we need to clear its mType, so that its
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// destructor doesn't muck with the data we just transferred out of it.
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tmp.mType = &nsSMILNullType::sSingleton;
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}
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nsresult
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nsSMILValue::Add(const nsSMILValue& aValueToAdd, PRUint32 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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NS_ABORT_IF_FALSE(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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NS_ABORT_IF_FALSE(IsNull(), "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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