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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
#include "SMILInstanceTime.h"
#include "mozilla/AutoRestore.h"
#include "mozilla/SMILInterval.h"
#include "mozilla/SMILTimeValueSpec.h"
namespace mozilla {
//----------------------------------------------------------------------
// Implementation
SMILInstanceTime::SMILInstanceTime(const SMILTimeValue& aTime,
SMILInstanceTimeSource aSource,
SMILTimeValueSpec* aCreator,
SMILInterval* 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);
}
SMILInstanceTime::~SMILInstanceTime() {
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 SMILInstanceTime::Unlink() {
RefPtr<SMILInstanceTime> deathGrip(this);
if (mBaseInterval) {
mBaseInterval->RemoveDependentTime(*this);
mBaseInterval = nullptr;
}
mCreator = nullptr;
}
void SMILInstanceTime::HandleChangedInterval(
const SMILTimeContainer* 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<SMILInstanceTime> deathGrip(this);
mozilla::AutoRestore<bool> setVisited(mVisited);
mVisited = true;
mCreator->HandleChangedInstanceTime(*GetBaseTime(), aSrcContainer, *this,
objectChanged);
}
void SMILInstanceTime::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<SMILInstanceTime> deathGrip(this);
mCreator->HandleDeletedInstanceTime(*this);
mCreator = nullptr;
}
void SMILInstanceTime::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 SMILInstanceTime::ShouldPreserve() const {
return mFixedEndpointRefCnt > 0 || (mFlags & kWasDynamicEndpoint);
}
void SMILInstanceTime::UnmarkShouldPreserve() {
mFlags &= ~kWasDynamicEndpoint;
}
void SMILInstanceTime::AddRefFixedEndpoint() {
MOZ_ASSERT(mFixedEndpointRefCnt < UINT16_MAX,
"Fixed endpoint reference count upper limit reached");
++mFixedEndpointRefCnt;
mFlags &= ~kMayUpdate; // Once fixed, always fixed
}
void SMILInstanceTime::ReleaseFixedEndpoint() {
MOZ_ASSERT(mFixedEndpointRefCnt > 0, "Duplicate release");
--mFixedEndpointRefCnt;
if (mFixedEndpointRefCnt == 0 && IsDynamic()) {
mFlags |= kWasDynamicEndpoint;
}
}
bool SMILInstanceTime::IsDependentOn(const SMILInstanceTime& aOther) const {
if (mVisited) return false;
const SMILInstanceTime* myBaseTime = GetBaseTime();
if (!myBaseTime) return false;
if (myBaseTime == &aOther) return true;
mozilla::AutoRestore<bool> setVisited(mVisited);
mVisited = true;
return myBaseTime->IsDependentOn(aOther);
}
const SMILInstanceTime* SMILInstanceTime::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 SMILInstanceTime::SetBaseInterval(SMILInterval* 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 SMILTimeValueSpec object.");
if (!mCreator) return;
aBaseInterval->AddDependentTime(*this);
}
mBaseInterval = aBaseInterval;
}
} // namespace mozilla