1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/smil/nsSMILInstanceTime.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,208 @@
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 "nsSMILInstanceTime.h"
1.10 +#include "nsSMILInterval.h"
1.11 +#include "nsSMILTimeValueSpec.h"
1.12 +#include "mozilla/AutoRestore.h"
1.13 +
1.14 +//----------------------------------------------------------------------
1.15 +// Implementation
1.16 +
1.17 +nsSMILInstanceTime::nsSMILInstanceTime(const nsSMILTimeValue& aTime,
1.18 + nsSMILInstanceTimeSource aSource,
1.19 + nsSMILTimeValueSpec* aCreator,
1.20 + nsSMILInterval* aBaseInterval)
1.21 + : mTime(aTime),
1.22 + mFlags(0),
1.23 + mVisited(false),
1.24 + mFixedEndpointRefCnt(0),
1.25 + mSerial(0),
1.26 + mCreator(aCreator),
1.27 + mBaseInterval(nullptr) // This will get set to aBaseInterval in a call to
1.28 + // SetBaseInterval() at end of constructor
1.29 +{
1.30 + switch (aSource) {
1.31 + case SOURCE_NONE:
1.32 + // No special flags
1.33 + break;
1.34 +
1.35 + case SOURCE_DOM:
1.36 + mFlags = kDynamic | kFromDOM;
1.37 + break;
1.38 +
1.39 + case SOURCE_SYNCBASE:
1.40 + mFlags = kMayUpdate;
1.41 + break;
1.42 +
1.43 + case SOURCE_EVENT:
1.44 + mFlags = kDynamic;
1.45 + break;
1.46 + }
1.47 +
1.48 + SetBaseInterval(aBaseInterval);
1.49 +}
1.50 +
1.51 +nsSMILInstanceTime::~nsSMILInstanceTime()
1.52 +{
1.53 + NS_ABORT_IF_FALSE(!mBaseInterval,
1.54 + "Destroying instance time without first calling Unlink()");
1.55 + NS_ABORT_IF_FALSE(mFixedEndpointRefCnt == 0,
1.56 + "Destroying instance time that is still used as the fixed endpoint of an "
1.57 + "interval");
1.58 +}
1.59 +
1.60 +void
1.61 +nsSMILInstanceTime::Unlink()
1.62 +{
1.63 + nsRefPtr<nsSMILInstanceTime> deathGrip(this);
1.64 + if (mBaseInterval) {
1.65 + mBaseInterval->RemoveDependentTime(*this);
1.66 + mBaseInterval = nullptr;
1.67 + }
1.68 + mCreator = nullptr;
1.69 +}
1.70 +
1.71 +void
1.72 +nsSMILInstanceTime::HandleChangedInterval(
1.73 + const nsSMILTimeContainer* aSrcContainer,
1.74 + bool aBeginObjectChanged,
1.75 + bool aEndObjectChanged)
1.76 +{
1.77 + // It's possible a sequence of notifications might cause our base interval to
1.78 + // be updated and then deleted. Furthermore, the delete might happen whilst
1.79 + // we're still in the queue to be notified of the change. In any case, if we
1.80 + // don't have a base interval, just ignore the change.
1.81 + if (!mBaseInterval)
1.82 + return;
1.83 +
1.84 + NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not.");
1.85 +
1.86 + if (mVisited) {
1.87 + // Break the cycle here
1.88 + Unlink();
1.89 + return;
1.90 + }
1.91 +
1.92 + bool objectChanged = mCreator->DependsOnBegin() ? aBeginObjectChanged :
1.93 + aEndObjectChanged;
1.94 +
1.95 + mozilla::AutoRestore<bool> setVisited(mVisited);
1.96 + mVisited = true;
1.97 +
1.98 + nsRefPtr<nsSMILInstanceTime> deathGrip(this);
1.99 + mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
1.100 + objectChanged);
1.101 +}
1.102 +
1.103 +void
1.104 +nsSMILInstanceTime::HandleDeletedInterval()
1.105 +{
1.106 + NS_ABORT_IF_FALSE(mBaseInterval,
1.107 + "Got call to HandleDeletedInterval on an independent instance time");
1.108 + NS_ABORT_IF_FALSE(mCreator, "Base interval is set but creator is not");
1.109 +
1.110 + mBaseInterval = nullptr;
1.111 + mFlags &= ~kMayUpdate; // Can't update without a base interval
1.112 +
1.113 + nsRefPtr<nsSMILInstanceTime> deathGrip(this);
1.114 + mCreator->HandleDeletedInstanceTime(*this);
1.115 + mCreator = nullptr;
1.116 +}
1.117 +
1.118 +void
1.119 +nsSMILInstanceTime::HandleFilteredInterval()
1.120 +{
1.121 + NS_ABORT_IF_FALSE(mBaseInterval,
1.122 + "Got call to HandleFilteredInterval on an independent instance time");
1.123 +
1.124 + mBaseInterval = nullptr;
1.125 + mFlags &= ~kMayUpdate; // Can't update without a base interval
1.126 + mCreator = nullptr;
1.127 +}
1.128 +
1.129 +bool
1.130 +nsSMILInstanceTime::ShouldPreserve() const
1.131 +{
1.132 + return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
1.133 +}
1.134 +
1.135 +void
1.136 +nsSMILInstanceTime::UnmarkShouldPreserve()
1.137 +{
1.138 + mFlags &= ~kWasDynamicEndpoint;
1.139 +}
1.140 +
1.141 +void
1.142 +nsSMILInstanceTime::AddRefFixedEndpoint()
1.143 +{
1.144 + NS_ABORT_IF_FALSE(mFixedEndpointRefCnt < UINT16_MAX,
1.145 + "Fixed endpoint reference count upper limit reached");
1.146 + ++mFixedEndpointRefCnt;
1.147 + mFlags &= ~kMayUpdate; // Once fixed, always fixed
1.148 +}
1.149 +
1.150 +void
1.151 +nsSMILInstanceTime::ReleaseFixedEndpoint()
1.152 +{
1.153 + NS_ABORT_IF_FALSE(mFixedEndpointRefCnt > 0, "Duplicate release");
1.154 + --mFixedEndpointRefCnt;
1.155 + if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
1.156 + mFlags |= kWasDynamicEndpoint;
1.157 + }
1.158 +}
1.159 +
1.160 +bool
1.161 +nsSMILInstanceTime::IsDependentOn(const nsSMILInstanceTime& aOther) const
1.162 +{
1.163 + if (mVisited)
1.164 + return false;
1.165 +
1.166 + const nsSMILInstanceTime* myBaseTime = GetBaseTime();
1.167 + if (!myBaseTime)
1.168 + return false;
1.169 +
1.170 + if (myBaseTime == &aOther)
1.171 + return true;
1.172 +
1.173 + mozilla::AutoRestore<bool> setVisited(mVisited);
1.174 + mVisited = true;
1.175 + return myBaseTime->IsDependentOn(aOther);
1.176 +}
1.177 +
1.178 +const nsSMILInstanceTime*
1.179 +nsSMILInstanceTime::GetBaseTime() const
1.180 +{
1.181 + if (!mBaseInterval) {
1.182 + return nullptr;
1.183 + }
1.184 +
1.185 + NS_ABORT_IF_FALSE(mCreator, "Base interval is set but there is no creator.");
1.186 + if (!mCreator) {
1.187 + return nullptr;
1.188 + }
1.189 +
1.190 + return mCreator->DependsOnBegin() ? mBaseInterval->Begin() :
1.191 + mBaseInterval->End();
1.192 +}
1.193 +
1.194 +void
1.195 +nsSMILInstanceTime::SetBaseInterval(nsSMILInterval* aBaseInterval)
1.196 +{
1.197 + NS_ABORT_IF_FALSE(!mBaseInterval,
1.198 + "Attempting to reassociate an instance time with a different interval.");
1.199 +
1.200 + if (aBaseInterval) {
1.201 + NS_ABORT_IF_FALSE(mCreator,
1.202 + "Attempting to create a dependent instance time without reference "
1.203 + "to the creating nsSMILTimeValueSpec object.");
1.204 + if (!mCreator)
1.205 + return;
1.206 +
1.207 + aBaseInterval->AddDependentTime(*this);
1.208 + }
1.209 +
1.210 + mBaseInterval = aBaseInterval;
1.211 +}
