dom/ipc/VsyncWorkerChild.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 "VsyncWorkerChild.h"
   8 #include "mozilla/dom/WorkerPrivate.h"
   9 #include "mozilla/dom/WorkerRef.h"
  10 #include "mozilla/dom/WorkerScope.h"
  11
  12 namespace mozilla::dom {
  13
  14 VsyncWorkerChild::VsyncWorkerChild() = default;
  15
  16 VsyncWorkerChild::~VsyncWorkerChild() = default;
  17
  18 bool VsyncWorkerChild::Initialize(WorkerPrivate* aWorkerPrivate) {
  19   MOZ_ASSERT(aWorkerPrivate);
  20   MOZ_ASSERT(!mWorkerRef);
  21
  22   mWorkerRef =
  23       IPCWorkerRef::Create(aWorkerPrivate, "VsyncWorkerChild",
  24                            [self = RefPtr{this}]() { self->Destroy(); });
  25   return !!mWorkerRef;
  26 }
  27
  28 void VsyncWorkerChild::Destroy() {
  29   MOZ_ASSERT_IF(!CanSend(), !mWorkerRef);
  30   MOZ_ASSERT_IF(!CanSend(), !mObserving);
  31   Send__delete__(this);
  32   MOZ_ASSERT(!mWorkerRef);
  33   MOZ_ASSERT(!mObserving);
  34 }
  35
  36 void VsyncWorkerChild::TryObserve() {
  37   if (CanSend() && !mObserving) {
  38     mObserving = SendObserve();
  39   }
  40 }
  41
  42 void VsyncWorkerChild::TryUnobserve() {
  43   if (CanSend() && mObserving) {
  44     mObserving = !SendUnobserve();
  45   }
  46 }
  47
  48 mozilla::ipc::IPCResult VsyncWorkerChild::RecvNotify(const VsyncEvent& aVsync,
  49                                                      const float& aVsyncRate) {
  50   // For MOZ_CAN_RUN_SCRIPT_BOUNDARY purposes: We know IPDL is explicitly
  51   // keeping our actor alive until it is done processing the messages. We know
  52   // that the WorkerGlobalScope callee is responsible keeping itself alive
  53   // during the OnVsync callback.
  54   WorkerPrivate* workerPrivate = mWorkerRef->Private();
  55   WorkerGlobalScope* scope = workerPrivate->GlobalScope();
  56   if (scope) {
  57     scope->OnVsync(aVsync);
  58   }
  59   return IPC_OK();
  60 }
  61
  62 void VsyncWorkerChild::ActorDestroy(ActorDestroyReason aActorDestroyReason) {
  63   mWorkerRef = nullptr;
  64   mObserving = false;
  65 }
  66
  67 }  // namespace mozilla::dom