1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/smil/nsSMILValue.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,144 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "nsSMILValue.h"
1.10 +#include "nsDebug.h"
1.11 +#include <string.h>
1.12 +
1.13 +//----------------------------------------------------------------------
1.14 +// Public methods
1.15 +
1.16 +nsSMILValue::nsSMILValue(const nsISMILType* aType)
1.17 + : mType(nsSMILNullType::Singleton())
1.18 +{
1.19 + if (!aType) {
1.20 + NS_ERROR("Trying to construct nsSMILValue with null mType pointer");
1.21 + return;
1.22 + }
1.23 +
1.24 + InitAndCheckPostcondition(aType);
1.25 +}
1.26 +
1.27 +nsSMILValue::nsSMILValue(const nsSMILValue& aVal)
1.28 + : mType(nsSMILNullType::Singleton())
1.29 +{
1.30 + InitAndCheckPostcondition(aVal.mType);
1.31 + mType->Assign(*this, aVal);
1.32 +}
1.33 +
1.34 +const nsSMILValue&
1.35 +nsSMILValue::operator=(const nsSMILValue& aVal)
1.36 +{
1.37 + if (&aVal == this)
1.38 + return *this;
1.39 +
1.40 + if (mType != aVal.mType) {
1.41 + DestroyAndReinit(aVal.mType);
1.42 + }
1.43 +
1.44 + mType->Assign(*this, aVal);
1.45 +
1.46 + return *this;
1.47 +}
1.48 +
1.49 +bool
1.50 +nsSMILValue::operator==(const nsSMILValue& aVal) const
1.51 +{
1.52 + if (&aVal == this)
1.53 + return true;
1.54 +
1.55 + return mType == aVal.mType && mType->IsEqual(*this, aVal);
1.56 +}
1.57 +
1.58 +void
1.59 +nsSMILValue::Swap(nsSMILValue& aOther)
1.60 +{
1.61 + nsSMILValue tmp;
1.62 + memcpy(&tmp, &aOther, sizeof(nsSMILValue)); // tmp = aOther
1.63 + memcpy(&aOther, this, sizeof(nsSMILValue)); // aOther = this
1.64 + memcpy(this, &tmp, sizeof(nsSMILValue)); // this = tmp
1.65 +
1.66 + // |tmp| is about to die -- we need to clear its mType, so that its
1.67 + // destructor doesn't muck with the data we just transferred out of it.
1.68 + tmp.mType = nsSMILNullType::Singleton();
1.69 +}
1.70 +
1.71 +nsresult
1.72 +nsSMILValue::Add(const nsSMILValue& aValueToAdd, uint32_t aCount)
1.73 +{
1.74 + if (aValueToAdd.mType != mType) {
1.75 + NS_ERROR("Trying to add incompatible types");
1.76 + return NS_ERROR_FAILURE;
1.77 + }
1.78 +
1.79 + return mType->Add(*this, aValueToAdd, aCount);
1.80 +}
1.81 +
1.82 +nsresult
1.83 +nsSMILValue::SandwichAdd(const nsSMILValue& aValueToAdd)
1.84 +{
1.85 + if (aValueToAdd.mType != mType) {
1.86 + NS_ERROR("Trying to add incompatible types");
1.87 + return NS_ERROR_FAILURE;
1.88 + }
1.89 +
1.90 + return mType->SandwichAdd(*this, aValueToAdd);
1.91 +}
1.92 +
1.93 +nsresult
1.94 +nsSMILValue::ComputeDistance(const nsSMILValue& aTo, double& aDistance) const
1.95 +{
1.96 + if (aTo.mType != mType) {
1.97 + NS_ERROR("Trying to calculate distance between incompatible types");
1.98 + return NS_ERROR_FAILURE;
1.99 + }
1.100 +
1.101 + return mType->ComputeDistance(*this, aTo, aDistance);
1.102 +}
1.103 +
1.104 +nsresult
1.105 +nsSMILValue::Interpolate(const nsSMILValue& aEndVal,
1.106 + double aUnitDistance,
1.107 + nsSMILValue& aResult) const
1.108 +{
1.109 + if (aEndVal.mType != mType) {
1.110 + NS_ERROR("Trying to interpolate between incompatible types");
1.111 + return NS_ERROR_FAILURE;
1.112 + }
1.113 +
1.114 + if (aResult.mType != mType) {
1.115 + // Outparam has wrong type
1.116 + aResult.DestroyAndReinit(mType);
1.117 + }
1.118 +
1.119 + return mType->Interpolate(*this, aEndVal, aUnitDistance, aResult);
1.120 +}
1.121 +
1.122 +//----------------------------------------------------------------------
1.123 +// Helper methods
1.124 +
1.125 +// Wrappers for nsISMILType::Init & ::Destroy that verify their postconditions
1.126 +void
1.127 +nsSMILValue::InitAndCheckPostcondition(const nsISMILType* aNewType)
1.128 +{
1.129 + aNewType->Init(*this);
1.130 + NS_ABORT_IF_FALSE(mType == aNewType,
1.131 + "Post-condition of Init failed. nsSMILValue is invalid");
1.132 +}
1.133 +
1.134 +void
1.135 +nsSMILValue::DestroyAndCheckPostcondition()
1.136 +{
1.137 + mType->Destroy(*this);
1.138 + NS_ABORT_IF_FALSE(IsNull(), "Post-condition of Destroy failed. "
1.139 + "nsSMILValue not null after destroying");
1.140 +}
1.141 +
1.142 +void
1.143 +nsSMILValue::DestroyAndReinit(const nsISMILType* aNewType)
1.144 +{
1.145 + DestroyAndCheckPostcondition();
1.146 + InitAndCheckPostcondition(aNewType);
1.147 +}
