зеркало из https://github.com/mozilla/gecko-dev.git
123 строки
3.3 KiB
C++
123 строки
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "BackgroundParent.h"
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#include "BackgroundParentImpl.h"
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#include "gfxPlatform.h"
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#include "mozilla/Unused.h"
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#include "nsIThread.h"
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#include "nsThreadUtils.h"
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#include "VsyncSource.h"
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namespace mozilla {
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using namespace ipc;
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namespace layout {
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/*static*/ already_AddRefed<VsyncParent>
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VsyncParent::Create()
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{
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AssertIsOnBackgroundThread();
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RefPtr<gfx::VsyncSource> vsyncSource = gfxPlatform::GetPlatform()->GetHardwareVsync();
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RefPtr<VsyncParent> vsyncParent = new VsyncParent();
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vsyncParent->mVsyncDispatcher = vsyncSource->GetRefreshTimerVsyncDispatcher();
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return vsyncParent.forget();
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}
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VsyncParent::VsyncParent()
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: mObservingVsync(false)
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, mDestroyed(false)
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, mBackgroundThread(NS_GetCurrentThread())
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{
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MOZ_ASSERT(mBackgroundThread);
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AssertIsOnBackgroundThread();
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}
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VsyncParent::~VsyncParent()
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{
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// Since we use NS_INLINE_DECL_THREADSAFE_REFCOUNTING, we can't make sure
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// VsyncParent is always released on the background thread.
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}
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bool
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VsyncParent::NotifyVsync(TimeStamp aTimeStamp)
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{
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// Called on hardware vsync thread. We should post to current ipc thread.
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MOZ_ASSERT(!IsOnBackgroundThread());
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nsCOMPtr<nsIRunnable> vsyncEvent =
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NewRunnableMethod<TimeStamp>("layout::VsyncParent::DispatchVsyncEvent",
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this,
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&VsyncParent::DispatchVsyncEvent,
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aTimeStamp);
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MOZ_ALWAYS_SUCCEEDS(mBackgroundThread->Dispatch(vsyncEvent, NS_DISPATCH_NORMAL));
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return true;
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}
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void
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VsyncParent::DispatchVsyncEvent(TimeStamp aTimeStamp)
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{
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AssertIsOnBackgroundThread();
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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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Unused << SendNotify(aTimeStamp);
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}
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}
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mozilla::ipc::IPCResult
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VsyncParent::RecvRequestVsyncRate()
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{
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AssertIsOnBackgroundThread();
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TimeDuration vsyncRate = gfxPlatform::GetPlatform()->GetHardwareVsync()->GetGlobalDisplay().GetVsyncRate();
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Unused << SendVsyncRate(vsyncRate.ToMilliseconds());
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return IPC_OK();
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}
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mozilla::ipc::IPCResult
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VsyncParent::RecvObserve()
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{
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AssertIsOnBackgroundThread();
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if (!mObservingVsync) {
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mVsyncDispatcher->AddChildRefreshTimer(this);
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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
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VsyncParent::RecvUnobserve()
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{
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AssertIsOnBackgroundThread();
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if (mObservingVsync) {
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mVsyncDispatcher->RemoveChildRefreshTimer(this);
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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
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VsyncParent::ActorDestroy(ActorDestroyReason aReason)
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{
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MOZ_ASSERT(!mDestroyed);
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AssertIsOnBackgroundThread();
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if (mObservingVsync) {
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mVsyncDispatcher->RemoveChildRefreshTimer(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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} // namespace layout
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} // namespace mozilla
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