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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "AndroidVsync.h"
#include "mozilla/java/GeckoAppShellWrappers.h"
#include "nsTArray.h"
/**
* Implementation for the AndroidVsync class.
*/
namespace mozilla {
namespace widget {
StaticDataMutex<ThreadSafeWeakPtr<AndroidVsync>> AndroidVsync::sInstance(
"AndroidVsync::sInstance");
/* static */ RefPtr<AndroidVsync> AndroidVsync::GetInstance() {
auto weakInstance = sInstance.Lock();
RefPtr<AndroidVsync> instance(*weakInstance);
if (!instance) {
instance = new AndroidVsync();
*weakInstance = instance;
}
return instance;
}
/**
* Owned by the Java AndroidVsync instance.
*/
class AndroidVsyncSupport final
: public java::AndroidVsync::Natives<AndroidVsyncSupport> {
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AndroidVsyncSupport)
using Base = java::AndroidVsync::Natives<AndroidVsyncSupport>;
using Base::AttachNative;
using Base::DisposeNative;
explicit AndroidVsyncSupport(AndroidVsync* aAndroidVsync)
: mAndroidVsync(std::move(aAndroidVsync),
"AndroidVsyncSupport::mAndroidVsync") {}
// Called by Java
void NotifyVsync(const java::AndroidVsync::LocalRef& aInstance,
int64_t aFrameTimeNanos) {
auto androidVsync = mAndroidVsync.Lock();
if (*androidVsync) {
(*androidVsync)->NotifyVsync(aFrameTimeNanos);
}
}
// Called by the AndroidVsync destructor
void Unlink() {
auto androidVsync = mAndroidVsync.Lock();
*androidVsync = nullptr;
}
protected:
~AndroidVsyncSupport() = default;
DataMutex<AndroidVsync*> mAndroidVsync;
};
AndroidVsync::AndroidVsync() : mImpl("AndroidVsync.mImpl") {
AndroidVsyncSupport::Init();
auto impl = mImpl.Lock();
impl->mSupport = new AndroidVsyncSupport(this);
impl->mSupportJava = java::AndroidVsync::New();
AndroidVsyncSupport::AttachNative(impl->mSupportJava, impl->mSupport);
float fps = java::GeckoAppShell::GetScreenRefreshRate();
impl->mVsyncDuration = TimeDuration::FromMilliseconds(1000.0 / fps);
}
AndroidVsync::~AndroidVsync() {
auto impl = mImpl.Lock();
impl->mInputObservers.Clear();
impl->mRenderObservers.Clear();
impl->UpdateObservingVsync();
impl->mSupport->Unlink();
}
TimeDuration AndroidVsync::GetVsyncRate() {
auto impl = mImpl.Lock();
return impl->mVsyncDuration;
}
void AndroidVsync::RegisterObserver(Observer* aObserver, ObserverType aType) {
auto impl = mImpl.Lock();
if (aType == AndroidVsync::INPUT) {
impl->mInputObservers.AppendElement(aObserver);
} else {
impl->mRenderObservers.AppendElement(aObserver);
}
impl->UpdateObservingVsync();
}
void AndroidVsync::UnregisterObserver(Observer* aObserver, ObserverType aType) {
auto impl = mImpl.Lock();
if (aType == AndroidVsync::INPUT) {
impl->mInputObservers.RemoveElement(aObserver);
} else {
impl->mRenderObservers.RemoveElement(aObserver);
}
aObserver->Dispose();
impl->UpdateObservingVsync();
}
void AndroidVsync::Impl::UpdateObservingVsync() {
bool shouldObserve =
!mInputObservers.IsEmpty() || !mRenderObservers.IsEmpty();
if (shouldObserve != mObservingVsync) {
mObservingVsync = mSupportJava->ObserveVsync(shouldObserve);
}
}
// Always called on the Java UI thread.
void AndroidVsync::NotifyVsync(int64_t aFrameTimeNanos) {
// Convert aFrameTimeNanos to a TimeStamp. The value converts trivially to
// the internal ticks representation of TimeStamp_posix; both use the
// monotonic clock and are in nanoseconds.
TimeStamp timeStamp = TimeStamp::FromSystemTime(aFrameTimeNanos);
// Do not keep the lock held while calling OnVsync.
nsTArray<Observer*> observers;
{
auto impl = mImpl.Lock();
observers.AppendElements(impl->mInputObservers);
observers.AppendElements(impl->mRenderObservers);
}
for (Observer* observer : observers) {
observer->OnVsync(timeStamp);
}
}
} // namespace widget
} // namespace mozilla
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