dom/performance/PerformancePaintTiming.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "PerformancePaintTiming.h"
   8 #include "Performance.h"
   9 #include "MainThreadUtils.h"
  10 #include "mozilla/dom/PerformanceMeasureBinding.h"
  11 #include "nsRFPService.h"
  12
  13 using namespace mozilla::dom;
  14
  15 NS_IMPL_CYCLE_COLLECTION_INHERITED(PerformancePaintTiming, PerformanceEntry,
  16                                    mPerformance)
  17
  18 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformancePaintTiming)
  19 NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)
  20
  21 NS_IMPL_ADDREF_INHERITED(PerformancePaintTiming, PerformanceEntry)
  22 NS_IMPL_RELEASE_INHERITED(PerformancePaintTiming, PerformanceEntry)
  23
  24 PerformancePaintTiming::PerformancePaintTiming(Performance* aPerformance,
  25                                                const nsAString& aName,
  26                                                const TimeStamp& aStartTime)
  27     : PerformanceEntry(aPerformance->GetParentObject(), aName, u"paint"_ns),
  28       mPerformance(aPerformance),
  29       mRawStartTime(aStartTime) {}
  30
  31 PerformancePaintTiming::~PerformancePaintTiming() = default;
  32
  33 JSObject* PerformancePaintTiming::WrapObject(
  34     JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
  35   return PerformancePaintTiming_Binding::Wrap(aCx, this, aGivenProto);
  36 }
  37
  38 DOMHighResTimeStamp PerformancePaintTiming::StartTime() const {
  39   if (mCachedStartTime.isNothing()) {
  40     DOMHighResTimeStamp rawValue =
  41         mPerformance->GetDOMTiming()->TimeStampToDOMHighRes(mRawStartTime);
  42     mCachedStartTime.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
  43         rawValue, mPerformance->GetRandomTimelineSeed(),
  44         mPerformance->IsSystemPrincipal(),
  45         mPerformance->CrossOriginIsolated()));
  46   }
  47   return mCachedStartTime.value();
  48 }
  49
  50 size_t PerformancePaintTiming::SizeOfIncludingThis(
  51     mozilla::MallocSizeOf aMallocSizeOf) const {
  52   return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
  53 }