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VsyncSource.cpp
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VsyncSource.cpp
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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 "VsyncSource.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
#include "mozilla/VsyncDispatcher.h"
#include "MainThreadUtils.h"
namespace mozilla {
namespace gfx {
void VsyncSource::AddCompositorVsyncDispatcher(
CompositorVsyncDispatcher* aCompositorVsyncDispatcher) {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
// Just use the global display until we have enough information to get the
// corresponding display for compositor.
GetGlobalDisplay().AddCompositorVsyncDispatcher(aCompositorVsyncDispatcher);
}
void VsyncSource::RemoveCompositorVsyncDispatcher(
CompositorVsyncDispatcher* aCompositorVsyncDispatcher) {
MOZ_ASSERT(XRE_IsParentProcess());
MOZ_ASSERT(NS_IsMainThread());
// See also AddCompositorVsyncDispatcher().
GetGlobalDisplay().RemoveCompositorVsyncDispatcher(
aCompositorVsyncDispatcher);
}
void VsyncSource::MoveListenersToNewSource(VsyncSource* aNewSource) {
GetGlobalDisplay().MoveListenersToNewSource(aNewSource->GetGlobalDisplay());
}
RefPtr<RefreshTimerVsyncDispatcher>
VsyncSource::GetRefreshTimerVsyncDispatcher() {
MOZ_ASSERT(XRE_IsParentProcess());
// See also AddCompositorVsyncDispatcher().
return GetGlobalDisplay().GetRefreshTimerVsyncDispatcher();
}
VsyncSource::Display::Display()
: mDispatcherLock("display dispatcher lock"),
mRefreshTimerNeedsVsync(false) {
MOZ_ASSERT(NS_IsMainThread());
mRefreshTimerVsyncDispatcher = new RefreshTimerVsyncDispatcher(this);
}
VsyncSource::Display::~Display() {
MOZ_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mDispatcherLock);
mRefreshTimerVsyncDispatcher = nullptr;
mCompositorVsyncDispatchers.Clear();
}
void VsyncSource::Display::NotifyVsync(TimeStamp aVsyncTimestamp) {
// Called on the vsync thread
MutexAutoLock lock(mDispatcherLock);
// mRefreshTimerVsyncDispatcher might be null here if MoveListenersToNewSource
// was called concurrently with this function and won the race to acquire
// mDispatcherLock. In this case the new VsyncSource that is replacing this
// one will handle notifications from now on, so we can abort.
if (!mRefreshTimerVsyncDispatcher) {
return;
}
mVsyncId = mVsyncId.Next();
VsyncEvent event(mVsyncId, aVsyncTimestamp);
for (size_t i = 0; i < mCompositorVsyncDispatchers.Length(); i++) {
mCompositorVsyncDispatchers[i]->NotifyVsync(event);
}
mRefreshTimerVsyncDispatcher->NotifyVsync(event);
}
TimeDuration VsyncSource::Display::GetVsyncRate() {
// If hardware queries fail / are unsupported, we have to just guess.
return TimeDuration::FromMilliseconds(1000.0 / 60.0);
}
void VsyncSource::Display::AddCompositorVsyncDispatcher(
CompositorVsyncDispatcher* aCompositorVsyncDispatcher) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aCompositorVsyncDispatcher);
{ // scope lock
MutexAutoLock lock(mDispatcherLock);
if (!mCompositorVsyncDispatchers.Contains(aCompositorVsyncDispatcher)) {
mCompositorVsyncDispatchers.AppendElement(aCompositorVsyncDispatcher);
}
}
UpdateVsyncStatus();
}
void VsyncSource::Display::RemoveCompositorVsyncDispatcher(
CompositorVsyncDispatcher* aCompositorVsyncDispatcher) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aCompositorVsyncDispatcher);
{ // Scope lock
MutexAutoLock lock(mDispatcherLock);
if (mCompositorVsyncDispatchers.Contains(aCompositorVsyncDispatcher)) {
mCompositorVsyncDispatchers.RemoveElement(aCompositorVsyncDispatcher);
}
}
UpdateVsyncStatus();
}
void VsyncSource::Display::MoveListenersToNewSource(
VsyncSource::Display& aNewDisplay) {
MOZ_ASSERT(NS_IsMainThread());
MutexAutoLock lock(mDispatcherLock);
MutexAutoLock newLock(aNewDisplay.mDispatcherLock);
aNewDisplay.mCompositorVsyncDispatchers.AppendElements(
std::move(mCompositorVsyncDispatchers));
aNewDisplay.mRefreshTimerVsyncDispatcher = mRefreshTimerVsyncDispatcher;
mRefreshTimerVsyncDispatcher->MoveToDisplay(&aNewDisplay);
mRefreshTimerVsyncDispatcher = nullptr;
}
void VsyncSource::Display::NotifyRefreshTimerVsyncStatus(bool aEnable) {
MOZ_ASSERT(NS_IsMainThread());
mRefreshTimerNeedsVsync = aEnable;
UpdateVsyncStatus();
}
void VsyncSource::Display::UpdateVsyncStatus() {
MOZ_ASSERT(NS_IsMainThread());
// WARNING: This function SHOULD NOT BE CALLED WHILE HOLDING LOCKS
// NotifyVsync grabs a lock to dispatch vsync events
// When disabling vsync, we wait for the underlying thread to stop on some
// platforms We can deadlock if we wait for the underlying vsync thread to
// stop while the vsync thread is in NotifyVsync.
bool enableVsync = false;
{ // scope lock
MutexAutoLock lock(mDispatcherLock);
enableVsync =
!mCompositorVsyncDispatchers.IsEmpty() || mRefreshTimerNeedsVsync;
}
if (enableVsync) {
EnableVsync();
} else {
DisableVsync();
}
if (IsVsyncEnabled() != enableVsync) {
NS_WARNING("Vsync status did not change.");
}
}
RefPtr<RefreshTimerVsyncDispatcher>
VsyncSource::Display::GetRefreshTimerVsyncDispatcher() {
return mRefreshTimerVsyncDispatcher;
}
void VsyncSource::Shutdown() { GetGlobalDisplay().Shutdown(); }
} // namespace gfx
} // namespace mozilla