1 files changed, 32 insertions, 0 deletions
diff --git a/gfx/ipc/CompositorWidgetVsyncObserver.cpp b/gfx/ipc/CompositorWidgetVsyncObserver.cpp
new file mode 100644
index 0000000000..a552e02ae6
--- /dev/null
+++ b/gfx/ipc/CompositorWidgetVsyncObserver.cpp
@@ -0,0 +1,32 @@
+/* -*- 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 "CompositorWidgetVsyncObserver.h"
+#include "mozilla/gfx/VsyncBridgeChild.h"
+
+namespace mozilla {
+namespace widget {
+
+CompositorWidgetVsyncObserver::CompositorWidgetVsyncObserver(
+    RefPtr<VsyncBridgeChild> aVsyncBridge,
+    const layers::LayersId& aRootLayerTreeId)
+    : mVsyncBridge(aVsyncBridge), mRootLayerTreeId(aRootLayerTreeId) {
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(NS_IsMainThread());
+}
+
+CompositorWidgetVsyncObserver::~CompositorWidgetVsyncObserver() = default;
+
+void CompositorWidgetVsyncObserver::NotifyVsync(const VsyncEvent& aVsync) {
+  // Vsync notifications should only arrive on the vsync thread.
+  MOZ_ASSERT(XRE_IsParentProcess());
+  MOZ_ASSERT(!NS_IsMainThread());
+
+  mVsyncBridge->NotifyVsync(aVsync, mRootLayerTreeId);
+}
+
+}  // namespace widget
+}  // namespace mozilla