From 5f8de423f190bbb79a62f804151bc24824fa32d8 Mon Sep 17 00:00:00 2001
From: "Matt A. Tobin" <mattatobin@localhost.localdomain>
Date: Fri, 2 Feb 2018 04:16:08 -0500
Subject: Add m-esr52 at 52.6.0

---
 gfx/thebes/VsyncSource.cpp | 153 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 gfx/thebes/VsyncSource.cpp

(limited to 'gfx/thebes/VsyncSource.cpp')

diff --git a/gfx/thebes/VsyncSource.cpp b/gfx/thebes/VsyncSource.cpp
new file mode 100644
index 000000000..cb69db560
--- /dev/null
+++ b/gfx/thebes/VsyncSource.cpp
@@ -0,0 +1,153 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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);
+}
+
+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();
+}
+
+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);
+
+  for (size_t i = 0; i < mCompositorVsyncDispatchers.Length(); i++) {
+    mCompositorVsyncDispatchers[i]->NotifyVsync(aVsyncTimestamp);
+  }
+
+  mRefreshTimerVsyncDispatcher->NotifyVsync(aVsyncTimestamp);
+}
+
+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::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
-- 
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