1 files changed, 188 insertions, 0 deletions
diff --git a/dom/smil/SMILInstanceTime.cpp b/dom/smil/SMILInstanceTime.cpp
new file mode 100644
index 0000000000..7f38b8c1d7
--- /dev/null
+++ b/dom/smil/SMILInstanceTime.cpp
@@ -0,0 +1,188 @@
+/* -*- 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
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#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