1 files changed, 85 insertions, 0 deletions
diff --git a/dom/performance/LargestContentfulPaint.cpp b/dom/performance/LargestContentfulPaint.cpp
new file mode 100644
index 0000000000..29984ade73
--- /dev/null
+++ b/dom/performance/LargestContentfulPaint.cpp
@@ -0,0 +1,85 @@
+/* -*- 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/Element.h"
+#include "nsContentUtils.h"
+#include "nsRFPService.h"
+#include "Performance.h"
+#include "PerformanceMainThread.h"
+#include "LargestContentfulPaint.h"
+
+namespace mozilla::dom {
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(LargestContentfulPaint, PerformanceEntry,
+                                   mPerformance, mURI, mElement)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LargestContentfulPaint)
+NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)
+
+NS_IMPL_ADDREF_INHERITED(LargestContentfulPaint, PerformanceEntry)
+NS_IMPL_RELEASE_INHERITED(LargestContentfulPaint, PerformanceEntry)
+
+LargestContentfulPaint::LargestContentfulPaint(Performance* aPerformance,
+                                               DOMHighResTimeStamp aRenderTime,
+                                               DOMHighResTimeStamp aLoadTime,
+                                               unsigned long aSize,
+                                               nsIURI* aURI, Element* aElement)
+    : PerformanceEntry(aPerformance->GetParentObject(), u""_ns,
+                       kLargestContentfulPaintName),
+      mPerformance(static_cast<PerformanceMainThread*>(aPerformance)),
+      mRenderTime(aRenderTime),
+      mLoadTime(aLoadTime),
+      mSize(aSize),
+      mURI(aURI),
+      mElement(aElement) {
+  MOZ_ASSERT(mPerformance);
+  MOZ_ASSERT(mElement);
+  // The element could be a pseudo-element
+  if (mElement->ChromeOnlyAccess()) {
+    mElement = Element::FromNodeOrNull(
+        aElement->FindFirstNonChromeOnlyAccessContent());
+  }
+
+  if (const Element* element = GetElement()) {
+    mId = element->GetID();
+  }
+}
+
+JSObject* LargestContentfulPaint::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
+  return LargestContentfulPaint_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+Element* LargestContentfulPaint::GetElement() const {
+  return mElement ? nsContentUtils::GetAnElementForTiming(
+                        mElement, mElement->GetComposedDoc(), nullptr)
+                  : nullptr;
+}
+
+DOMHighResTimeStamp LargestContentfulPaint::RenderTime() const {
+  return nsRFPService::ReduceTimePrecisionAsMSecs(
+      mRenderTime, mPerformance->GetRandomTimelineSeed(),
+      mPerformance->GetRTPCallerType());
+}
+
+DOMHighResTimeStamp LargestContentfulPaint::LoadTime() const {
+  return nsRFPService::ReduceTimePrecisionAsMSecs(
+      mLoadTime, mPerformance->GetRandomTimelineSeed(),
+      mPerformance->GetRTPCallerType());
+}
+
+DOMHighResTimeStamp LargestContentfulPaint::StartTime() const {
+  DOMHighResTimeStamp startTime = !mRenderTime ? mLoadTime : mRenderTime;
+  return nsRFPService::ReduceTimePrecisionAsMSecs(
+      startTime, mPerformance->GetRandomTimelineSeed(),
+      mPerformance->GetRTPCallerType());
+}
+
+void LargestContentfulPaint::GetUrl(nsAString& aUrl) {
+  if (mURI) {
+    CopyUTF8toUTF16(mURI->GetSpecOrDefault(), aUrl);
+  }
+}
+}  // namespace mozilla::dom