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https://github.com/mozilla/gecko-dev.git
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103 lines
3 KiB
C++
103 lines
3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "VsyncParent.h"
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#include "mozilla/Unused.h"
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#include "nsThreadUtils.h"
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#include "nsIThread.h"
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namespace mozilla::dom {
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VsyncParent::VsyncParent()
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: mObservingVsync(false),
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mDestroyed(false),
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mInitialThread(NS_GetCurrentThread()) {}
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void VsyncParent::UpdateVsyncDispatcher(
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const RefPtr<VsyncDispatcher>& aVsyncDispatcher) {
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if (aVsyncDispatcher == mVsyncDispatcher) {
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return;
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}
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if (mObservingVsync && mVsyncDispatcher) {
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mVsyncDispatcher->RemoveVsyncObserver(this);
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}
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mVsyncDispatcher = aVsyncDispatcher;
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if (mObservingVsync) {
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mVsyncDispatcher->AddVsyncObserver(this);
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}
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}
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void VsyncParent::NotifyVsync(const VsyncEvent& aVsync) {
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if (IsOnInitialThread()) {
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DispatchVsyncEvent(aVsync);
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return;
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}
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// Called on hardware vsync thread. We should post to current ipc thread.
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nsCOMPtr<nsIRunnable> vsyncEvent = NewRunnableMethod<VsyncEvent>(
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"dom::VsyncParent::DispatchVsyncEvent", this,
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&VsyncParent::DispatchVsyncEvent, aVsync);
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MOZ_ALWAYS_SUCCEEDS(NS_DispatchToThreadQueue(
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vsyncEvent.forget(), mInitialThread, EventQueuePriority::Vsync));
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}
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void VsyncParent::DispatchVsyncEvent(const VsyncEvent& aVsync) {
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AssertIsOnInitialThread();
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// If we call NotifyVsync() when we handle ActorDestroy() message, we might
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// still call DispatchVsyncEvent().
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// Similarly, we might also receive RecvUnobserveVsync() when call
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// NotifyVsync(). We use mObservingVsync and mDestroyed flags to skip this
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// notification.
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if (mObservingVsync && !mDestroyed) {
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TimeDuration vsyncRate = mVsyncDispatcher->GetVsyncRate();
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Unused << SendNotify(aVsync, vsyncRate.ToMilliseconds());
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}
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}
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mozilla::ipc::IPCResult VsyncParent::RecvObserve() {
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AssertIsOnInitialThread();
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if (!mObservingVsync) {
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if (mVsyncDispatcher) {
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mVsyncDispatcher->AddVsyncObserver(this);
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}
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mObservingVsync = true;
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return IPC_OK();
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}
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return IPC_FAIL_NO_REASON(this);
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}
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mozilla::ipc::IPCResult VsyncParent::RecvUnobserve() {
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AssertIsOnInitialThread();
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if (mObservingVsync) {
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if (mVsyncDispatcher) {
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mVsyncDispatcher->RemoveVsyncObserver(this);
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}
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mObservingVsync = false;
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return IPC_OK();
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}
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return IPC_FAIL_NO_REASON(this);
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}
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void VsyncParent::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
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MOZ_ASSERT(!mDestroyed);
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AssertIsOnInitialThread();
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if (mObservingVsync && mVsyncDispatcher) {
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mVsyncDispatcher->RemoveVsyncObserver(this);
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}
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mVsyncDispatcher = nullptr;
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mDestroyed = true;
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}
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bool VsyncParent::IsOnInitialThread() {
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return NS_GetCurrentThread() == mInitialThread;
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}
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void VsyncParent::AssertIsOnInitialThread() { MOZ_ASSERT(IsOnInitialThread()); }
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} // namespace mozilla::dom
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