1 files changed, 136 insertions, 0 deletions
diff --git a/dom/performance/PerformanceEventTiming.h b/dom/performance/PerformanceEventTiming.h
new file mode 100644
index 0000000000..3f39610d95
--- /dev/null
+++ b/dom/performance/PerformanceEventTiming.h
@@ -0,0 +1,136 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_PerformanceEventTiming_h___
+#define mozilla_dom_PerformanceEventTiming_h___
+
+#include "mozilla/dom/PerformanceEntry.h"
+#include "mozilla/EventForwards.h"
+#include "nsRFPService.h"
+#include "Performance.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsINode.h"
+
+namespace mozilla {
+class WidgetEvent;
+namespace dom {
+
+class PerformanceEventTiming final
+    : public PerformanceEntry,
+      public LinkedListElement<RefPtr<PerformanceEventTiming>> {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(PerformanceEventTiming,
+                                           PerformanceEntry)
+
+  static already_AddRefed<PerformanceEventTiming> TryGenerateEventTiming(
+      const EventTarget* aTarget, const WidgetEvent* aEvent);
+
+  already_AddRefed<PerformanceEventTiming> Clone() {
+    RefPtr<PerformanceEventTiming> eventTiming =
+        new PerformanceEventTiming(*this);
+    return eventTiming.forget();
+  }
+
+  JSObject* WrapObject(JSContext* cx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  DOMHighResTimeStamp ProcessingStart() const {
+    if (mCachedProcessingStart.isNothing()) {
+      mCachedProcessingStart.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
+          mProcessingStart, mPerformance->GetRandomTimelineSeed(),
+          mPerformance->GetRTPCallerType()));
+    }
+    return mCachedProcessingStart.value();
+  }
+
+  DOMHighResTimeStamp ProcessingEnd() const {
+    if (mCachedProcessingEnd.isNothing()) {
+      mCachedProcessingEnd.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
+          mProcessingEnd, mPerformance->GetRandomTimelineSeed(),
+          mPerformance->GetRTPCallerType()));
+    }
+    return mCachedProcessingEnd.value();
+  }
+
+  bool Cancelable() const { return mCancelable; }
+
+  nsINode* GetTarget() const;
+
+  void SetDuration(const DOMHighResTimeStamp aDuration) {
+    mDuration = aDuration;
+  }
+
+  // nsRFPService::ReduceTimePrecisionAsMSecs might causes
+  // some memory overhead, using the raw timestamp internally
+  // to avoid calling in unnecessarily.
+  DOMHighResTimeStamp RawDuration() const { return mDuration; }
+
+  DOMHighResTimeStamp Duration() const override {
+    if (mCachedDuration.isNothing()) {
+      mCachedDuration.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
+          mDuration, mPerformance->GetRandomTimelineSeed(),
+          mPerformance->GetRTPCallerType()));
+    }
+    return mCachedDuration.value();
+  }
+
+  // Similar as RawDuration; Used to avoid calling
+  // nsRFPService::ReduceTimePrecisionAsMSecs unnecessarily.
+  DOMHighResTimeStamp RawStartTime() const { return mStartTime; }
+
+  DOMHighResTimeStamp StartTime() const override {
+    if (mCachedStartTime.isNothing()) {
+      mCachedStartTime.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
+          mStartTime, mPerformance->GetRandomTimelineSeed(),
+          mPerformance->GetRTPCallerType()));
+    }
+    return mCachedStartTime.value();
+  }
+
+  bool ShouldAddEntryToBuffer(double aDuration) const;
+  bool ShouldAddEntryToObserverBuffer(PerformanceObserverInit&) const override;
+
+  void BufferEntryIfNeeded() override;
+
+  void FinalizeEventTiming(EventTarget* aTarget);
+
+  EventMessage GetMessage() const { return mMessage; }
+
+ private:
+  PerformanceEventTiming(Performance* aPerformance, const nsAString& aName,
+                         const TimeStamp& aStartTime, bool aIsCacelable,
+                         EventMessage aMessage);
+
+  PerformanceEventTiming(const PerformanceEventTiming& aEventTimingEntry);
+
+  ~PerformanceEventTiming() = default;
+
+  RefPtr<Performance> mPerformance;
+
+  DOMHighResTimeStamp mProcessingStart;
+  mutable Maybe<DOMHighResTimeStamp> mCachedProcessingStart;
+
+  DOMHighResTimeStamp mProcessingEnd;
+  mutable Maybe<DOMHighResTimeStamp> mCachedProcessingEnd;
+
+  nsWeakPtr mTarget;
+
+  DOMHighResTimeStamp mStartTime;
+  mutable Maybe<DOMHighResTimeStamp> mCachedStartTime;
+
+  DOMHighResTimeStamp mDuration;
+  mutable Maybe<DOMHighResTimeStamp> mCachedDuration;
+
+  bool mCancelable;
+
+  EventMessage mMessage;
+};
+}  // namespace dom
+}  // namespace mozilla
+
+#endif