1 files changed, 62 insertions, 0 deletions
diff --git a/gfx/thebes/SoftwareVsyncSource.h b/gfx/thebes/SoftwareVsyncSource.h
new file mode 100644
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+++ b/gfx/thebes/SoftwareVsyncSource.h
@@ -0,0 +1,62 @@
+/* -*- 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_SOFTWARE_VSYNC_SOURCE_H
+#define GFX_SOFTWARE_VSYNC_SOURCE_H
+
+#include "mozilla/Monitor.h"
+#include "mozilla/RefPtr.h"
+#include "mozilla/TimeStamp.h"
+#include "base/thread.h"
+#include "nsISupportsImpl.h"
+#include "VsyncSource.h"
+
+class SoftwareDisplay final : public mozilla::gfx::VsyncSource::Display
+{
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SoftwareDisplay)
+
+public:
+  SoftwareDisplay();
+  virtual void EnableVsync() override;
+  virtual void DisableVsync() override;
+  virtual bool IsVsyncEnabled() override;
+  bool IsInSoftwareVsyncThread();
+  virtual void NotifyVsync(mozilla::TimeStamp aVsyncTimestamp) override;
+  virtual mozilla::TimeDuration GetVsyncRate() override;
+  void ScheduleNextVsync(mozilla::TimeStamp aVsyncTimestamp);
+  void Shutdown() override;
+
+protected:
+  ~SoftwareDisplay();
+
+private:
+  mozilla::TimeDuration mVsyncRate;
+  // Use a chromium thread because nsITimers* fire on the main thread
+  base::Thread* mVsyncThread;
+  RefPtr<mozilla::CancelableRunnable> mCurrentVsyncTask; // only access on vsync thread
+  bool mVsyncEnabled; // Only access on main thread
+}; // SoftwareDisplay
+
+// Fallback option to use a software timer to mimic vsync. Useful for gtests
+// To mimic a hardware vsync thread, we create a dedicated software timer
+// vsync thread.
+class SoftwareVsyncSource : public mozilla::gfx::VsyncSource
+{
+public:
+  SoftwareVsyncSource();
+  ~SoftwareVsyncSource();
+
+  virtual Display& GetGlobalDisplay() override
+  {
+    MOZ_ASSERT(mGlobalDisplay != nullptr);
+    return *mGlobalDisplay;
+  }
+
+private:
+  RefPtr<SoftwareDisplay> mGlobalDisplay;
+};
+
+#endif /* GFX_SOFTWARE_VSYNC_SOURCE_H */