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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "nsSMILInstanceTime.h"
#include "nsSMILInterval.h"
#include "nsSMILTimeValueSpec.h"
#include "mozilla/AutoRestore.h"
//----------------------------------------------------------------------
// Implementation
nsSMILInstanceTime::nsSMILInstanceTime(const nsSMILTimeValue& aTime,
nsSMILInstanceTimeSource aSource,
nsSMILTimeValueSpec* aCreator,
nsSMILInterval* aBaseInterval)
: mTime(aTime),
mFlags(0),
mVisited(false),
mFixedEndpointRefCnt(0),
mSerial(0),
mCreator(aCreator),
mBaseInterval(nullptr) // This will get set to aBaseInterval in a call to
// SetBaseInterval() at end of constructor
{
switch (aSource) {
case SOURCE_NONE:
// No special flags
break;
case SOURCE_DOM:
mFlags = kDynamic | kFromDOM;
break;
case SOURCE_SYNCBASE:
mFlags = kMayUpdate;
break;
case SOURCE_EVENT:
mFlags = kDynamic;
break;
}
SetBaseInterval(aBaseInterval);
}
nsSMILInstanceTime::~nsSMILInstanceTime()
{
MOZ_ASSERT(!mBaseInterval,
"Destroying instance time without first calling Unlink()");
MOZ_ASSERT(mFixedEndpointRefCnt == 0,
"Destroying instance time that is still used as the fixed "
"endpoint of an interval");
}
void
nsSMILInstanceTime::Unlink()
{
RefPtr<nsSMILInstanceTime> deathGrip(this);
if (mBaseInterval) {
mBaseInterval->RemoveDependentTime(*this);
mBaseInterval = nullptr;
}
mCreator = nullptr;
}
void
nsSMILInstanceTime::HandleChangedInterval(
const nsSMILTimeContainer* aSrcContainer,
bool aBeginObjectChanged,
bool aEndObjectChanged)
{
// It's possible a sequence of notifications might cause our base interval to
// be updated and then deleted. Furthermore, the delete might happen whilst
// we're still in the queue to be notified of the change. In any case, if we
// don't have a base interval, just ignore the change.
if (!mBaseInterval)
return;
MOZ_ASSERT(mCreator, "Base interval is set but creator is not.");
if (mVisited) {
// Break the cycle here
Unlink();
return;
}
bool objectChanged = mCreator->DependsOnBegin() ? aBeginObjectChanged :
aEndObjectChanged;
RefPtr<nsSMILInstanceTime> deathGrip(this);
mozilla::AutoRestore<bool> setVisited(mVisited);
mVisited = true;
mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
objectChanged);
}
void
nsSMILInstanceTime::HandleDeletedInterval()
{
MOZ_ASSERT(mBaseInterval,
"Got call to HandleDeletedInterval on an independent instance "
"time");
MOZ_ASSERT(mCreator, "Base interval is set but creator is not");
mBaseInterval = nullptr;
mFlags &= ~kMayUpdate; // Can't update without a base interval
RefPtr<nsSMILInstanceTime> deathGrip(this);
mCreator->HandleDeletedInstanceTime(*this);
mCreator = nullptr;
}
void
nsSMILInstanceTime::HandleFilteredInterval()
{
MOZ_ASSERT(mBaseInterval,
"Got call to HandleFilteredInterval on an independent instance "
"time");
mBaseInterval = nullptr;
mFlags &= ~kMayUpdate; // Can't update without a base interval
mCreator = nullptr;
}
bool
nsSMILInstanceTime::ShouldPreserve() const
{
return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
}
void
nsSMILInstanceTime::UnmarkShouldPreserve()
{
mFlags &= ~kWasDynamicEndpoint;
}
void
nsSMILInstanceTime::AddRefFixedEndpoint()
{
MOZ_ASSERT(mFixedEndpointRefCnt < UINT16_MAX,
"Fixed endpoint reference count upper limit reached");
++mFixedEndpointRefCnt;
mFlags &= ~kMayUpdate; // Once fixed, always fixed
}
void
nsSMILInstanceTime::ReleaseFixedEndpoint()
{
MOZ_ASSERT(mFixedEndpointRefCnt > 0, "Duplicate release");
--mFixedEndpointRefCnt;
if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
mFlags |= kWasDynamicEndpoint;
}
}
bool
nsSMILInstanceTime::IsDependentOn(const nsSMILInstanceTime& aOther) const
{
if (mVisited)
return false;
const nsSMILInstanceTime* myBaseTime = GetBaseTime();
if (!myBaseTime)
return false;
if (myBaseTime == &aOther)
return true;
mozilla::AutoRestore<bool> setVisited(mVisited);
mVisited = true;
return myBaseTime->IsDependentOn(aOther);
}
const nsSMILInstanceTime*
nsSMILInstanceTime::GetBaseTime() const
{
if (!mBaseInterval) {
return nullptr;
}
MOZ_ASSERT(mCreator, "Base interval is set but there is no creator.");
if (!mCreator) {
return nullptr;
}
return mCreator->DependsOnBegin() ? mBaseInterval->Begin() :
mBaseInterval->End();
}
void
nsSMILInstanceTime::SetBaseInterval(nsSMILInterval* aBaseInterval)
{
MOZ_ASSERT(!mBaseInterval,
"Attempting to reassociate an instance time with a different "
"interval.");
if (aBaseInterval) {
MOZ_ASSERT(mCreator,
"Attempting to create a dependent instance time without "
"reference to the creating nsSMILTimeValueSpec object.");
if (!mCreator)
return;
aBaseInterval->AddDependentTime(*this);
}
mBaseInterval = aBaseInterval;
}
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