mirror of
https://github.com/classilla/tenfourfox.git
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213 lines
5.5 KiB
C++
213 lines
5.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsSMILInstanceTime.h"
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#include "nsSMILInterval.h"
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#include "nsSMILTimeValueSpec.h"
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#include "mozilla/AutoRestore.h"
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//----------------------------------------------------------------------
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// Implementation
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nsSMILInstanceTime::nsSMILInstanceTime(const nsSMILTimeValue& aTime,
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nsSMILInstanceTimeSource aSource,
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nsSMILTimeValueSpec* aCreator,
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nsSMILInterval* aBaseInterval)
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: mTime(aTime),
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mFlags(0),
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mVisited(false),
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mFixedEndpointRefCnt(0),
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mSerial(0),
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mCreator(aCreator),
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mBaseInterval(nullptr) // This will get set to aBaseInterval in a call to
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// SetBaseInterval() at end of constructor
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{
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switch (aSource) {
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case SOURCE_NONE:
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// No special flags
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break;
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case SOURCE_DOM:
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mFlags = kDynamic | kFromDOM;
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break;
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case SOURCE_SYNCBASE:
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mFlags = kMayUpdate;
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break;
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case SOURCE_EVENT:
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mFlags = kDynamic;
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break;
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}
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SetBaseInterval(aBaseInterval);
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}
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nsSMILInstanceTime::~nsSMILInstanceTime()
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{
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MOZ_ASSERT(!mBaseInterval,
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"Destroying instance time without first calling Unlink()");
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MOZ_ASSERT(mFixedEndpointRefCnt == 0,
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"Destroying instance time that is still used as the fixed "
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"endpoint of an interval");
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}
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void
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nsSMILInstanceTime::Unlink()
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{
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RefPtr<nsSMILInstanceTime> deathGrip(this);
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if (mBaseInterval) {
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mBaseInterval->RemoveDependentTime(*this);
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mBaseInterval = nullptr;
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}
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mCreator = nullptr;
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}
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void
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nsSMILInstanceTime::HandleChangedInterval(
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const nsSMILTimeContainer* aSrcContainer,
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bool aBeginObjectChanged,
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bool aEndObjectChanged)
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{
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// It's possible a sequence of notifications might cause our base interval to
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// be updated and then deleted. Furthermore, the delete might happen whilst
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// we're still in the queue to be notified of the change. In any case, if we
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// don't have a base interval, just ignore the change.
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if (!mBaseInterval)
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return;
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MOZ_ASSERT(mCreator, "Base interval is set but creator is not.");
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if (mVisited) {
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// Break the cycle here
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Unlink();
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return;
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}
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bool objectChanged = mCreator->DependsOnBegin() ? aBeginObjectChanged :
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aEndObjectChanged;
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mozilla::AutoRestore<bool> setVisited(mVisited);
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mVisited = true;
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RefPtr<nsSMILInstanceTime> deathGrip(this);
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mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
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objectChanged);
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}
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void
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nsSMILInstanceTime::HandleDeletedInterval()
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{
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MOZ_ASSERT(mBaseInterval,
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"Got call to HandleDeletedInterval on an independent instance "
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"time");
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MOZ_ASSERT(mCreator, "Base interval is set but creator is not");
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mBaseInterval = nullptr;
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mFlags &= ~kMayUpdate; // Can't update without a base interval
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RefPtr<nsSMILInstanceTime> deathGrip(this);
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mCreator->HandleDeletedInstanceTime(*this);
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mCreator = nullptr;
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}
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void
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nsSMILInstanceTime::HandleFilteredInterval()
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{
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MOZ_ASSERT(mBaseInterval,
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"Got call to HandleFilteredInterval on an independent instance "
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"time");
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mBaseInterval = nullptr;
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mFlags &= ~kMayUpdate; // Can't update without a base interval
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mCreator = nullptr;
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}
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bool
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nsSMILInstanceTime::ShouldPreserve() const
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{
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return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
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}
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void
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nsSMILInstanceTime::UnmarkShouldPreserve()
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{
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mFlags &= ~kWasDynamicEndpoint;
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}
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void
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nsSMILInstanceTime::AddRefFixedEndpoint()
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{
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MOZ_ASSERT(mFixedEndpointRefCnt < UINT16_MAX,
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"Fixed endpoint reference count upper limit reached");
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++mFixedEndpointRefCnt;
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mFlags &= ~kMayUpdate; // Once fixed, always fixed
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}
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void
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nsSMILInstanceTime::ReleaseFixedEndpoint()
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{
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MOZ_ASSERT(mFixedEndpointRefCnt > 0, "Duplicate release");
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--mFixedEndpointRefCnt;
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if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
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mFlags |= kWasDynamicEndpoint;
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}
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}
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bool
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nsSMILInstanceTime::IsDependentOn(const nsSMILInstanceTime& aOther) const
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{
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if (mVisited)
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return false;
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const nsSMILInstanceTime* myBaseTime = GetBaseTime();
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if (!myBaseTime)
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return false;
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if (myBaseTime == &aOther)
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return true;
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mozilla::AutoRestore<bool> setVisited(mVisited);
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mVisited = true;
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return myBaseTime->IsDependentOn(aOther);
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}
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const nsSMILInstanceTime*
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nsSMILInstanceTime::GetBaseTime() const
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{
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if (!mBaseInterval) {
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return nullptr;
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}
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MOZ_ASSERT(mCreator, "Base interval is set but there is no creator.");
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if (!mCreator) {
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return nullptr;
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}
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return mCreator->DependsOnBegin() ? mBaseInterval->Begin() :
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mBaseInterval->End();
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}
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void
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nsSMILInstanceTime::SetBaseInterval(nsSMILInterval* aBaseInterval)
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{
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MOZ_ASSERT(!mBaseInterval,
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"Attempting to reassociate an instance time with a different "
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"interval.");
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if (aBaseInterval) {
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MOZ_ASSERT(mCreator,
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"Attempting to create a dependent instance time without "
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"reference to the creating nsSMILTimeValueSpec object.");
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if (!mCreator)
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return;
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aBaseInterval->AddDependentTime(*this);
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}
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mBaseInterval = aBaseInterval;
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}
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