tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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PerformancePaintTiming.cpp (2160B)

      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 
      9 #include "MainThreadUtils.h"
     10 #include "Performance.h"
     11 #include "mozilla/dom/PerformanceMeasureBinding.h"
     12 #include "nsGkAtoms.h"
     13 #include "nsRFPService.h"
     14 
     15 using namespace mozilla::dom;
     16 
     17 NS_IMPL_CYCLE_COLLECTION_INHERITED(PerformancePaintTiming, PerformanceEntry,
     18                                   mPerformance)
     19 
     20 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(PerformancePaintTiming)
     21 NS_INTERFACE_MAP_END_INHERITING(PerformanceEntry)
     22 
     23 NS_IMPL_ADDREF_INHERITED(PerformancePaintTiming, PerformanceEntry)
     24 NS_IMPL_RELEASE_INHERITED(PerformancePaintTiming, PerformanceEntry)
     25 
     26 PerformancePaintTiming::PerformancePaintTiming(Performance* aPerformance,
     27                                               const nsAString& aName,
     28                                               const TimeStamp& aStartTime)
     29    : PerformanceEntry(aPerformance->GetParentObject(), aName,
     30                       nsGkAtoms::paint),
     31      mPerformance(aPerformance),
     32      mRawStartTime(aStartTime) {}
     33 
     34 PerformancePaintTiming::~PerformancePaintTiming() = default;
     35 
     36 JSObject* PerformancePaintTiming::WrapObject(
     37    JSContext* aCx, JS::Handle<JSObject*> aGivenProto) {
     38  return PerformancePaintTiming_Binding::Wrap(aCx, this, aGivenProto);
     39 }
     40 
     41 DOMHighResTimeStamp PerformancePaintTiming::StartTime() const {
     42  if (mCachedStartTime.isNothing()) {
     43    DOMHighResTimeStamp rawValue =
     44        mPerformance->GetDOMTiming()->TimeStampToDOMHighRes(mRawStartTime);
     45    mCachedStartTime.emplace(nsRFPService::ReduceTimePrecisionAsMSecs(
     46        rawValue, mPerformance->GetRandomTimelineSeed(),
     47        mPerformance->GetRTPCallerType()));
     48  }
     49  return mCachedStartTime.value();
     50 }
     51 
     52 size_t PerformancePaintTiming::SizeOfIncludingThis(
     53    mozilla::MallocSizeOf aMallocSizeOf) const {
     54  return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
     55 }