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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 00:47:55 +0000
commit26a029d407be480d791972afb5975cf62c9360a6 (patch)
treef435a8308119effd964b339f76abb83a57c29483 /gfx/thebes/VsyncSource.cpp
parentInitial commit. (diff)
downloadfirefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz
firefox-26a029d407be480d791972afb5975cf62c9360a6.zip
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'gfx/thebes/VsyncSource.cpp')
-rw-r--r--gfx/thebes/VsyncSource.cpp160
1 files changed, 160 insertions, 0 deletions
diff --git a/gfx/thebes/VsyncSource.cpp b/gfx/thebes/VsyncSource.cpp
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+++ b/gfx/thebes/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"
+#include "gfxPlatform.h"
+
+#ifdef MOZ_WAYLAND
+# include "WaylandVsyncSource.h"
+#endif
+
+namespace mozilla {
+namespace gfx {
+
+VsyncSource::VsyncSource() : mState("VsyncSource::State") {
+ MOZ_ASSERT(NS_IsMainThread());
+}
+
+VsyncSource::~VsyncSource() { MOZ_ASSERT(NS_IsMainThread()); }
+
+// Called on the vsync thread
+void VsyncSource::NotifyVsync(const TimeStamp& aVsyncTimestamp,
+ const TimeStamp& aOutputTimestamp) {
+ VsyncId vsyncId;
+ nsTArray<DispatcherRefWithCount> dispatchers;
+
+ {
+ auto state = mState.Lock();
+ vsyncId = state->mVsyncId.Next();
+ dispatchers = state->mDispatchers.Clone();
+ state->mVsyncId = vsyncId;
+ }
+
+ // Notify our listeners, outside of the lock.
+ const VsyncEvent event(vsyncId, aVsyncTimestamp, aOutputTimestamp);
+ for (const auto& dispatcher : dispatchers) {
+ dispatcher.mDispatcher->NotifyVsync(event);
+ }
+}
+
+void VsyncSource::AddVsyncDispatcher(VsyncDispatcher* aVsyncDispatcher) {
+ MOZ_ASSERT(aVsyncDispatcher);
+ {
+ auto state = mState.Lock();
+
+ // Find the dispatcher in mDispatchers. If it is already present, increment
+ // the count. If not, add it with a count of 1.
+ bool found = false;
+ for (auto& dispatcherRefWithCount : state->mDispatchers) {
+ if (dispatcherRefWithCount.mDispatcher == aVsyncDispatcher) {
+ dispatcherRefWithCount.mCount++;
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ state->mDispatchers.AppendElement(
+ DispatcherRefWithCount{aVsyncDispatcher, 1});
+ }
+ }
+
+ UpdateVsyncStatus();
+}
+
+void VsyncSource::RemoveVsyncDispatcher(VsyncDispatcher* aVsyncDispatcher) {
+ MOZ_ASSERT(aVsyncDispatcher);
+ {
+ auto state = mState.Lock();
+
+ // Find the dispatcher in mDispatchers. If found, decrement the count.
+ // If the count becomes zero, remove it from mDispatchers.
+ for (auto it = state->mDispatchers.begin(); it != state->mDispatchers.end();
+ ++it) {
+ if (it->mDispatcher == aVsyncDispatcher) {
+ it->mCount--;
+ if (it->mCount == 0) {
+ state->mDispatchers.RemoveElementAt(it);
+ }
+ break;
+ }
+ }
+
+ // In the future we should probably MOZ_RELEASE_ASSERT here that we don't
+ // try to remove a dispatcher which isn't in mDispatchers.
+ }
+
+ UpdateVsyncStatus();
+}
+
+// This is the base class implementation. Subclasses override this method.
+TimeDuration VsyncSource::GetVsyncRate() {
+ // If hardware queries fail / are unsupported, we have to just guess.
+ return TimeDuration::FromMilliseconds(1000.0 / 60.0);
+}
+
+void VsyncSource::UpdateVsyncStatus() {
+ if (!NS_IsMainThread()) {
+ NS_DispatchToMainThread(NS_NewRunnableFunction(
+ "VsyncSource::UpdateVsyncStatus",
+ [self = RefPtr{this}] { self->UpdateVsyncStatus(); }));
+ return;
+ }
+
+ 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
+ auto state = mState.Lock();
+ enableVsync = !state->mDispatchers.IsEmpty();
+ }
+
+ if (enableVsync) {
+ EnableVsync();
+ } else {
+ DisableVsync();
+ }
+
+ if (IsVsyncEnabled() != enableVsync) {
+ NS_WARNING("Vsync status did not change.");
+ }
+}
+
+// static
+Maybe<TimeDuration> VsyncSource::GetFastestVsyncRate() {
+ Maybe<TimeDuration> retVal;
+ if (!gfxPlatform::Initialized()) {
+ return retVal;
+ }
+
+ RefPtr<VsyncDispatcher> vsyncDispatcher =
+ gfxPlatform::GetPlatform()->GetGlobalVsyncDispatcher();
+ RefPtr<VsyncSource> vsyncSource = vsyncDispatcher->GetCurrentVsyncSource();
+ if (vsyncSource->IsVsyncEnabled()) {
+ retVal.emplace(vsyncSource->GetVsyncRate());
+#ifdef MOZ_WAYLAND
+ Maybe<TimeDuration> waylandRate = WaylandVsyncSource::GetFastestVsyncRate();
+ if (waylandRate) {
+ if (!retVal) {
+ retVal.emplace(*waylandRate);
+ } else if (*waylandRate < *retVal) {
+ retVal = waylandRate;
+ }
+ }
+#endif
+ }
+
+ return retVal;
+}
+
+} // namespace gfx
+} // namespace mozilla