gecko-dev/layout/ipc/VsyncChild.cpp

/* -*- 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 "VsyncChild.h"

#include "mozilla/SchedulerGroup.h"
#include "mozilla/VsyncDispatcher.h"
#include "nsThreadUtils.h"

namespace mozilla::layout {

VsyncChild::VsyncChild()
    : mObservingVsync(false),
      mIsShutdown(false),
      mVsyncRate(TimeDuration::Forever()) {
  MOZ_ASSERT(NS_IsMainThread());
}

VsyncChild::~VsyncChild() { MOZ_ASSERT(NS_IsMainThread()); }

bool VsyncChild::SendObserve() {
  MOZ_ASSERT(NS_IsMainThread());
  if (!mObservingVsync && !mIsShutdown) {
    mObservingVsync = true;
    PVsyncChild::SendObserve();
  }
  return true;
}

bool VsyncChild::SendUnobserve() {
  MOZ_ASSERT(NS_IsMainThread());
  if (mObservingVsync && !mIsShutdown) {
    mObservingVsync = false;
    PVsyncChild::SendUnobserve();
  }
  return true;
}

void VsyncChild::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mIsShutdown);
  mIsShutdown = true;
  mObserver = nullptr;
}

mozilla::ipc::IPCResult VsyncChild::RecvNotify(const VsyncEvent& aVsync) {
  MOZ_ASSERT(NS_IsMainThread());
  MOZ_ASSERT(!mIsShutdown);

  SchedulerGroup::MarkVsyncRan();
  if (mObservingVsync && mObserver) {
    mObserver->NotifyVsync(aVsync);
  }
  return IPC_OK();
}

void VsyncChild::SetVsyncObserver(VsyncObserver* aVsyncObserver) {
  MOZ_ASSERT(NS_IsMainThread());
  mObserver = aVsyncObserver;
}

TimeDuration VsyncChild::GetVsyncRate() {
  if (mVsyncRate == TimeDuration::Forever()) {
    PVsyncChild::SendRequestVsyncRate();
  }

  return mVsyncRate;
}

TimeDuration VsyncChild::VsyncRate() { return mVsyncRate; }

mozilla::ipc::IPCResult VsyncChild::RecvVsyncRate(const float& aVsyncRate) {
  mVsyncRate = TimeDuration::FromMilliseconds(aVsyncRate);
  return IPC_OK();
}

}  // namespace mozilla::layout