1 files changed, 169 insertions, 0 deletions
diff --git a/dom/html/TimeRanges.cpp b/dom/html/TimeRanges.cpp
new file mode 100644
index 0000000000..d5bcf27c2b
--- /dev/null
+++ b/dom/html/TimeRanges.cpp
@@ -0,0 +1,169 @@
+/* -*- 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 "mozilla/dom/TimeRanges.h"
+#include "mozilla/dom/TimeRangesBinding.h"
+#include "mozilla/dom/HTMLMediaElement.h"
+#include "TimeUnits.h"
+#include "nsError.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(TimeRanges, mParent)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(TimeRanges)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(TimeRanges)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TimeRanges)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+TimeRanges::TimeRanges() : mParent(nullptr) {}
+
+TimeRanges::TimeRanges(nsISupports* aParent) : mParent(aParent) {}
+
+TimeRanges::TimeRanges(nsISupports* aParent,
+                       const media::TimeIntervals& aTimeIntervals)
+    : TimeRanges(aParent) {
+  if (aTimeIntervals.IsInvalid()) {
+    return;
+  }
+  for (const media::TimeInterval& interval : aTimeIntervals) {
+    Add(interval.mStart.ToSeconds(), interval.mEnd.ToSeconds());
+  }
+}
+
+TimeRanges::TimeRanges(const media::TimeIntervals& aTimeIntervals)
+    : TimeRanges(nullptr, aTimeIntervals) {}
+
+media::TimeIntervals TimeRanges::ToTimeIntervals() const {
+  media::TimeIntervals t;
+  for (uint32_t i = 0; i < Length(); i++) {
+    t += media::TimeInterval(media::TimeUnit::FromSeconds(Start(i)),
+                             media::TimeUnit::FromSeconds(End(i)));
+  }
+  return t;
+}
+
+TimeRanges::~TimeRanges() = default;
+
+double TimeRanges::Start(uint32_t aIndex, ErrorResult& aRv) const {
+  if (aIndex >= mRanges.Length()) {
+    aRv = NS_ERROR_DOM_INDEX_SIZE_ERR;
+    return 0;
+  }
+
+  return Start(aIndex);
+}
+
+double TimeRanges::End(uint32_t aIndex, ErrorResult& aRv) const {
+  if (aIndex >= mRanges.Length()) {
+    aRv = NS_ERROR_DOM_INDEX_SIZE_ERR;
+    return 0;
+  }
+
+  return End(aIndex);
+}
+
+void TimeRanges::Add(double aStart, double aEnd) {
+  if (aStart > aEnd) {
+    NS_WARNING("Can't add a range if the end is older that the start.");
+    return;
+  }
+  mRanges.AppendElement(TimeRange(aStart, aEnd));
+}
+
+double TimeRanges::GetStartTime() {
+  if (mRanges.IsEmpty()) {
+    return -1.0;
+  }
+  return mRanges[0].mStart;
+}
+
+double TimeRanges::GetEndTime() {
+  if (mRanges.IsEmpty()) {
+    return -1.0;
+  }
+  return mRanges[mRanges.Length() - 1].mEnd;
+}
+
+void TimeRanges::Normalize(double aTolerance) {
+  if (mRanges.Length() >= 2) {
+    AutoTArray<TimeRange, 4> normalized;
+
+    mRanges.Sort(CompareTimeRanges());
+
+    // This merges the intervals.
+    TimeRange current(mRanges[0]);
+    for (uint32_t i = 1; i < mRanges.Length(); i++) {
+      if (current.mStart <= mRanges[i].mStart &&
+          current.mEnd >= mRanges[i].mEnd) {
+        continue;
+      }
+      if (current.mEnd + aTolerance >= mRanges[i].mStart) {
+        current.mEnd = mRanges[i].mEnd;
+      } else {
+        normalized.AppendElement(current);
+        current = mRanges[i];
+      }
+    }
+
+    normalized.AppendElement(current);
+
+    mRanges = std::move(normalized);
+  }
+}
+
+void TimeRanges::Union(const TimeRanges* aOtherRanges, double aTolerance) {
+  mRanges.AppendElements(aOtherRanges->mRanges);
+  Normalize(aTolerance);
+}
+
+void TimeRanges::Intersection(const TimeRanges* aOtherRanges) {
+  AutoTArray<TimeRange, 4> intersection;
+
+  const nsTArray<TimeRange>& otherRanges = aOtherRanges->mRanges;
+  for (index_type i = 0, j = 0;
+       i < mRanges.Length() && j < otherRanges.Length();) {
+    double start = std::max(mRanges[i].mStart, otherRanges[j].mStart);
+    double end = std::min(mRanges[i].mEnd, otherRanges[j].mEnd);
+    if (start < end) {
+      intersection.AppendElement(TimeRange(start, end));
+    }
+    if (mRanges[i].mEnd < otherRanges[j].mEnd) {
+      i += 1;
+    } else {
+      j += 1;
+    }
+  }
+
+  mRanges = std::move(intersection);
+}
+
+TimeRanges::index_type TimeRanges::Find(double aTime,
+                                        double aTolerance /* = 0 */) {
+  for (index_type i = 0; i < mRanges.Length(); ++i) {
+    if (aTime < mRanges[i].mEnd && (aTime + aTolerance) >= mRanges[i].mStart) {
+      return i;
+    }
+  }
+  return NoIndex;
+}
+
+JSObject* TimeRanges::WrapObject(JSContext* aCx,
+                                 JS::Handle<JSObject*> aGivenProto) {
+  return TimeRanges_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+nsISupports* TimeRanges::GetParentObject() const { return mParent; }
+
+void TimeRanges::Shift(double aOffset) {
+  for (index_type i = 0; i < mRanges.Length(); ++i) {
+    mRanges[i].mStart += aOffset;
+    mRanges[i].mEnd += aOffset;
+  }
+}
+
+}  // namespace mozilla::dom