1 files changed, 137 insertions, 0 deletions
diff --git a/dom/smil/SMILInterval.cpp b/dom/smil/SMILInterval.cpp
new file mode 100644
index 0000000000..e0ee99ac00
--- /dev/null
+++ b/dom/smil/SMILInterval.cpp
@@ -0,0 +1,137 @@
+/* -*- 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 "SMILInterval.h"
+
+#include "mozilla/DebugOnly.h"
+
+namespace mozilla {
+
+SMILInterval::SMILInterval() : mBeginFixed(false), mEndFixed(false) {}
+
+SMILInterval::SMILInterval(const SMILInterval& aOther)
+    : mBegin(aOther.mBegin),
+      mEnd(aOther.mEnd),
+      mBeginFixed(false),
+      mEndFixed(false) {
+  MOZ_ASSERT(aOther.mDependentTimes.IsEmpty(),
+             "Attempt to copy-construct an interval with dependent times; this "
+             "will lead to instance times being shared between intervals.");
+
+  // For the time being we don't allow intervals with fixed endpoints to be
+  // copied since we only ever copy-construct to establish a new current
+  // interval. If we ever need to copy historical intervals we may need to move
+  // the ReleaseFixedEndpoint calls from Unlink to the dtor.
+  MOZ_ASSERT(!aOther.mBeginFixed && !aOther.mEndFixed,
+             "Attempt to copy-construct an interval with fixed endpoints");
+}
+
+SMILInterval::~SMILInterval() {
+  MOZ_ASSERT(mDependentTimes.IsEmpty(),
+             "Destroying interval without disassociating dependent instance "
+             "times. Unlink was not called");
+}
+
+void SMILInterval::Unlink(bool aFiltered) {
+  for (int32_t i = mDependentTimes.Length() - 1; i >= 0; --i) {
+    if (aFiltered) {
+      mDependentTimes[i]->HandleFilteredInterval();
+    } else {
+      mDependentTimes[i]->HandleDeletedInterval();
+    }
+  }
+  mDependentTimes.Clear();
+  if (mBegin && mBeginFixed) {
+    mBegin->ReleaseFixedEndpoint();
+  }
+  mBegin = nullptr;
+  if (mEnd && mEndFixed) {
+    mEnd->ReleaseFixedEndpoint();
+  }
+  mEnd = nullptr;
+}
+
+SMILInstanceTime* SMILInterval::Begin() {
+  MOZ_ASSERT(mBegin && mEnd, "Requesting Begin() on un-initialized interval.");
+  return mBegin;
+}
+
+SMILInstanceTime* SMILInterval::End() {
+  MOZ_ASSERT(mBegin && mEnd, "Requesting End() on un-initialized interval.");
+  return mEnd;
+}
+
+void SMILInterval::SetBegin(SMILInstanceTime& aBegin) {
+  MOZ_ASSERT(aBegin.Time().IsDefinite(),
+             "Attempt to set unresolved or indefinite begin time on interval");
+  MOZ_ASSERT(!mBeginFixed,
+             "Attempt to set begin time but the begin point is fixed");
+  // Check that we're not making an instance time dependent on itself. Such an
+  // arrangement does not make intuitive sense and should be detected when
+  // creating or updating intervals.
+  MOZ_ASSERT(!mBegin || aBegin.GetBaseTime() != mBegin,
+             "Attempt to make self-dependent instance time");
+
+  mBegin = &aBegin;
+}
+
+void SMILInterval::SetEnd(SMILInstanceTime& aEnd) {
+  MOZ_ASSERT(!mEndFixed, "Attempt to set end time but the end point is fixed");
+  // As with SetBegin, check we're not making an instance time dependent on
+  // itself.
+  MOZ_ASSERT(!mEnd || aEnd.GetBaseTime() != mEnd,
+             "Attempting to make self-dependent instance time");
+
+  mEnd = &aEnd;
+}
+
+void SMILInterval::FixBegin() {
+  MOZ_ASSERT(mBegin && mEnd, "Fixing begin point on un-initialized interval");
+  MOZ_ASSERT(!mBeginFixed, "Duplicate calls to FixBegin()");
+  mBeginFixed = true;
+  mBegin->AddRefFixedEndpoint();
+}
+
+void SMILInterval::FixEnd() {
+  MOZ_ASSERT(mBegin && mEnd, "Fixing end point on un-initialized interval");
+  MOZ_ASSERT(mBeginFixed,
+             "Fixing the end of an interval without a fixed begin");
+  MOZ_ASSERT(!mEndFixed, "Duplicate calls to FixEnd()");
+  mEndFixed = true;
+  mEnd->AddRefFixedEndpoint();
+}
+
+void SMILInterval::AddDependentTime(SMILInstanceTime& aTime) {
+  RefPtr<SMILInstanceTime>* inserted =
+      mDependentTimes.InsertElementSorted(&aTime);
+  if (!inserted) {
+    NS_WARNING("Insufficient memory to insert instance time.");
+  }
+}
+
+void SMILInterval::RemoveDependentTime(const SMILInstanceTime& aTime) {
+  DebugOnly<bool> found = mDependentTimes.RemoveElementSorted(&aTime);
+  MOZ_ASSERT(found, "Couldn't find instance time to delete.");
+}
+
+void SMILInterval::GetDependentTimes(InstanceTimeList& aTimes) {
+  aTimes = mDependentTimes.Clone();
+}
+
+bool SMILInterval::IsDependencyChainLink() const {
+  if (!mBegin || !mEnd)
+    return false;  // Not yet initialised so it can't be part of a chain
+
+  if (mDependentTimes.IsEmpty()) return false;  // No dependents, chain end
+
+  // So we have dependents, but we're still only a link in the chain (as opposed
+  // to the end of the chain) if one of our endpoints is dependent on an
+  // interval other than ourselves.
+  return (mBegin->IsDependent() && mBegin->GetBaseInterval() != this) ||
+         (mEnd->IsDependent() && mEnd->GetBaseInterval() != this);
+}
+
+}  // namespace mozilla