dom/ipc/VsyncMainChild.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 "VsyncMainChild.h"
   8
   9 #include "mozilla/SchedulerGroup.h"
  10 #include "mozilla/VsyncDispatcher.h"
  11 #include "nsThreadUtils.h"
  12
  13 namespace mozilla::dom {
  14
  15 VsyncMainChild::VsyncMainChild()
  16     : mIsShutdown(false), mVsyncRate(TimeDuration::Forever()) {
  17   MOZ_ASSERT(NS_IsMainThread());
  18 }
  19
  20 VsyncMainChild::~VsyncMainChild() { MOZ_ASSERT(NS_IsMainThread()); }
  21
  22 void VsyncMainChild::AddChildRefreshTimer(VsyncObserver* aVsyncObserver) {
  23   MOZ_ASSERT(NS_IsMainThread());
  24   MOZ_ASSERT(!mObservers.Contains(aVsyncObserver));
  25
  26   if (mIsShutdown) {
  27     return;
  28   }
  29
  30   if (mObservers.IsEmpty()) {
  31     Unused << PVsyncChild::SendObserve();
  32   }
  33   mObservers.AppendElement(std::move(aVsyncObserver));
  34 }
  35
  36 void VsyncMainChild::RemoveChildRefreshTimer(VsyncObserver* aVsyncObserver) {
  37   MOZ_ASSERT(NS_IsMainThread());
  38   if (mIsShutdown) {
  39     return;
  40   }
  41
  42   if (mObservers.RemoveElement(aVsyncObserver) && mObservers.IsEmpty()) {
  43     Unused << PVsyncChild::SendUnobserve();
  44   }
  45 }
  46
  47 void VsyncMainChild::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
  48   MOZ_ASSERT(NS_IsMainThread());
  49   MOZ_ASSERT(!mIsShutdown);
  50   mIsShutdown = true;
  51
  52   if (!mObservers.IsEmpty()) {
  53     Unused << PVsyncChild::SendUnobserve();
  54   }
  55   mObservers.Clear();
  56 }
  57
  58 mozilla::ipc::IPCResult VsyncMainChild::RecvNotify(const VsyncEvent& aVsync,
  59                                                    const float& aVsyncRate) {
  60   MOZ_ASSERT(NS_IsMainThread());
  61   MOZ_ASSERT(!mIsShutdown);
  62
  63   mVsyncRate = TimeDuration::FromMilliseconds(aVsyncRate);
  64
  65   for (RefPtr<VsyncObserver> observer : mObservers.ForwardRange()) {
  66     observer->NotifyVsync(aVsync);
  67   }
  68   return IPC_OK();
  69 }
  70
  71 TimeDuration VsyncMainChild::GetVsyncRate() { return mVsyncRate; }
  72
  73 }  // namespace mozilla::dom