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Bug 1121331 - Part3: VsyncChild actor and VsyncRefreshTimer creation. r=roc r=bent

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This commit is contained in:
JerryShih 2015-01-14 00:38:00 +01:00
parent 4c6f90c4fe
commit f242ce34bc
1 changed files with 89 additions and 1 deletions
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90
layout/base/nsRefreshDriver.cpp
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@ -729,6 +729,47 @@ protected:
uint32_t mNextDriverIndex;
};
// The PBackground protocol connection callback. It will be called when
// PBackground is ready. Then we create the PVsync sub-protocol for our
// vsync-base RefreshTimer.
class VsyncChildCreateCallback MOZ_FINAL : public nsIIPCBackgroundChildCreateCallback
{
NS_DECL_ISUPPORTS
public:
VsyncChildCreateCallback()
{
MOZ_ASSERT(NS_IsMainThread());
}
static void CreateVsyncActor(PBackgroundChild* aPBackgroundChild)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aPBackgroundChild);
layout::PVsyncChild* actor = aPBackgroundChild->SendPVsyncConstructor();
layout::VsyncChild* child = static_cast<layout::VsyncChild*>(actor);
nsRefreshDriver::PVsyncActorCreated(child);
}
private:
virtual ~VsyncChildCreateCallback() {}
virtual void ActorCreated(PBackgroundChild* aPBackgroundChild) MOZ_OVERRIDE
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aPBackgroundChild);
CreateVsyncActor(aPBackgroundChild);
}
virtual void ActorFailed() MOZ_OVERRIDE
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_CRASH("Failed To Create VsyncChild Actor");
}
}; // VsyncChildCreateCallback
NS_IMPL_ISUPPORTS(VsyncChildCreateCallback, nsIIPCBackgroundChildCreateCallback)
} // namespace mozilla
static RefreshDriverTimer* sRegularRateTimer;
@ -739,6 +780,49 @@ static int32_t sHighPrecisionTimerRequests = 0;
// a bare pointer to avoid introducing a static constructor
static nsITimer *sDisableHighPrecisionTimersTimer = nullptr;
#endif
static RefreshDriverTimer*
CreateVsyncRefreshTimer()
{
// Sometimes, gfxPrefs is not initialized here. Make sure the gfxPrefs is
// ready.
gfxPrefs::GetSingleton();
if (!gfxPrefs::VsyncAlignedRefreshDriver()) {
return nullptr;
}
if (XRE_IsParentProcess()) {
// Make sure all vsync systems are ready.
gfxPlatform::GetPlatform();
// In parent process, we don't need to use ipc. We can create the
// VsyncRefreshDriverTimer directly.
return new VsyncRefreshDriverTimer();
}
// For ChildProcess case.
// Create the PVsync actor for vsync-base refresh timer.
// PBackgroundChild is created asynchronously. If PBackgroundChild is still
// unavailable, setup VsyncChildCreateCallback callback to handle the async
// connect. We will still use software timer before PVsync ready, and change
// to use hw timer when the connection is done. Please check
// VsyncChildCreateCallback::CreateVsyncActor() and
// nsRefreshDriver::PVsyncActorCreated().
PBackgroundChild* backgroundChild = BackgroundChild::GetForCurrentThread();
if (backgroundChild) {
// If we already have PBackgroundChild, create the
// child VsyncRefreshDriverTimer here.
VsyncChildCreateCallback::CreateVsyncActor(backgroundChild);
return sRegularRateTimer;
}
// Setup VsyncChildCreateCallback callback
nsRefPtr<nsIIPCBackgroundChildCreateCallback> callback = new VsyncChildCreateCallback();
if (NS_WARN_IF(!BackgroundChild::GetOrCreateForCurrentThread(callback))) {
MOZ_CRASH("PVsync actor create failed!");
}
return nullptr;
}
static uint32_t
GetFirstFrameDelay(imgIRequest* req)
{
@ -851,8 +935,12 @@ nsRefreshDriver::ChooseTimer() const
if (!sRegularRateTimer) {
bool isDefault = true;
double rate = GetRegularTimerInterval(&isDefault);
// Try to use vsync-base refresh timer first.
sRegularRateTimer = CreateVsyncRefreshTimer();
#ifdef XP_WIN
if (PreciseRefreshDriverTimerWindowsDwmVsync::IsSupported()) {
if (!sRegularRateTimer && PreciseRefreshDriverTimerWindowsDwmVsync::IsSupported()) {
sRegularRateTimer = new PreciseRefreshDriverTimerWindowsDwmVsync(rate, isDefault);
}
#endif