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.h | 84 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 gfx/thebes/VsyncSource.h

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

diff --git a/gfx/thebes/VsyncSource.h b/gfx/thebes/VsyncSource.h
new file mode 100644
index 000000000..317f31134
--- /dev/null
+++ b/gfx/thebes/VsyncSource.h
@@ -0,0 +1,84 @@
+/* -*- 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/. */
+
+#ifndef GFX_VSYNCSOURCE_H
+#define GFX_VSYNCSOURCE_H
+
+#include "nsTArray.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/TimeStamp.h"
+#include "nsISupportsImpl.h"
+
+namespace mozilla {
+class RefreshTimerVsyncDispatcher;
+class CompositorVsyncDispatcher;
+
+namespace gfx {
+
+// Controls how and when to enable/disable vsync. Lives as long as the
+// gfxPlatform does on the parent process
+class VsyncSource
+{
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(VsyncSource)
+
+  typedef mozilla::RefreshTimerVsyncDispatcher RefreshTimerVsyncDispatcher;
+  typedef mozilla::CompositorVsyncDispatcher CompositorVsyncDispatcher;
+
+public:
+  // Controls vsync unique to each display and unique on each platform
+  class Display {
+    public:
+      Display();
+      virtual ~Display();
+
+      // Notified when this display's vsync occurs, on the vsync thread
+      // The aVsyncTimestamp should normalize to the Vsync time that just occured
+      // However, different platforms give different vsync notification times.
+      // b2g - The vsync timestamp of the previous frame that was just displayed
+      // OSX - The vsync timestamp of the upcoming frame, in the future
+      // Windows: It's messy, see gfxWindowsPlatform.
+      // Android: TODO
+      // All platforms should normalize to the vsync that just occured.
+      // Large parts of Gecko assume TimeStamps should not be in the future such as animations
+      virtual void NotifyVsync(TimeStamp aVsyncTimestamp);
+
+      RefPtr<RefreshTimerVsyncDispatcher> GetRefreshTimerVsyncDispatcher();
+
+      void AddCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
+      void RemoveCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
+      void NotifyRefreshTimerVsyncStatus(bool aEnable);
+      virtual TimeDuration GetVsyncRate();
+
+      // These should all only be called on the main thread
+      virtual void EnableVsync() = 0;
+      virtual void DisableVsync() = 0;
+      virtual bool IsVsyncEnabled() = 0;
+      virtual void Shutdown() = 0;
+
+    private:
+      void UpdateVsyncStatus();
+
+      Mutex mDispatcherLock;
+      bool mRefreshTimerNeedsVsync;
+      nsTArray<RefPtr<CompositorVsyncDispatcher>> mCompositorVsyncDispatchers;
+      RefPtr<RefreshTimerVsyncDispatcher> mRefreshTimerVsyncDispatcher;
+  };
+
+  void AddCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
+  void RemoveCompositorVsyncDispatcher(CompositorVsyncDispatcher* aCompositorVsyncDispatcher);
+
+  RefPtr<RefreshTimerVsyncDispatcher> GetRefreshTimerVsyncDispatcher();
+  virtual Display& GetGlobalDisplay() = 0; // Works across all displays
+  void Shutdown();
+
+protected:
+  virtual ~VsyncSource() {}
+};
+
+} // namespace gfx
+} // namespace mozilla
+
+#endif /* GFX_VSYNCSOURCE_H */
-- 
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