1 files changed, 50 insertions, 0 deletions
diff --git a/gfx/ipc/CanvasRenderThread.h b/gfx/ipc/CanvasRenderThread.h
new file mode 100644
index 0000000000..08dd6c6d54
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+++ b/gfx/ipc/CanvasRenderThread.h
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+/* -*- 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/. */
+
+#ifndef _include_gfx_ipc_CanvasRenderThread_h__
+#define _include_gfx_ipc_CanvasRenderThread_h__
+
+#include "mozilla/DataMutex.h"
+#include "mozilla/layers/SynchronousTask.h"
+#include "mozilla/StaticPtr.h"
+#include "nsISupportsImpl.h"
+#include "nsThread.h"
+
+namespace mozilla::gfx {
+
+class CanvasRenderThread final {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
+      CanvasRenderThread)
+
+ public:
+  /// Can be called from any thread, may return nullptr late in shutdown.
+  static CanvasRenderThread* Get();
+
+  /// Can only be called from the main thread, expected to be called at most
+  /// once during a process' lifetime.
+  static void Start();
+
+  /// Can only be called from the main thread.
+  static void ShutDown();
+
+  /// Can be called from any thread.
+  static bool IsInCanvasRenderThread();
+
+  /// Can be called from any thread, may return nullptr late in shutdown.
+  static already_AddRefed<nsIThread> GetCanvasRenderThread();
+
+ private:
+  explicit CanvasRenderThread(RefPtr<nsIThread> aThread);
+  ~CanvasRenderThread();
+
+  void PostRunnable(already_AddRefed<nsIRunnable> aRunnable);
+
+  RefPtr<nsIThread> const mThread;
+};
+
+}  // namespace mozilla::gfx
+
+#endif  // _include_gfx_ipc_CanvasRenderThread_h__