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-rw-r--r--gfx/layers/ipc/CanvasThread.h97
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diff --git a/gfx/layers/ipc/CanvasThread.h b/gfx/layers/ipc/CanvasThread.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 https://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_layers_CanvasThread_h
+#define mozilla_layers_CanvasThread_h
+
+#include "mozilla/layers/CompositorThread.h"
+#include "mozilla/DataMutex.h"
+#include "mozilla/StaticPtr.h"
+#include "mozilla/TaskQueue.h"
+#include "nsIThreadPool.h"
+
+namespace mozilla {
+namespace layers {
+
+/**
+ * The CanvasThreadHolder is used to manage the lifetime of the canvas
+ * thread (IPC) and workers and also provides methods for using them.
+ */
+class CanvasThreadHolder final {
+ // We only AddRef/Release on the Compositor thread.
+ NS_INLINE_DECL_REFCOUNTING(CanvasThreadHolder)
+
+ public:
+ /**
+ * Ensures that the canvas thread and workers are created.
+ * This must be called on the compositor thread.
+ * @return a CanvasThreadHolder
+ */
+ static already_AddRefed<CanvasThreadHolder> EnsureCanvasThread();
+
+ /**
+ * Used to release CanvasThreadHolder references, which must be released on
+ * the compositor thread.
+ * @param aCanvasThreadHolder the reference to release
+ */
+ static void ReleaseOnCompositorThread(
+ already_AddRefed<CanvasThreadHolder> aCanvasThreadHolder);
+
+ /**
+ * @return true if in the canvas thread
+ */
+ static bool IsInCanvasThread();
+
+ /**
+ * @return true if in a canvas worker thread
+ */
+ static bool IsInCanvasWorker();
+
+ /**
+ * @return true if in the canvas thread or worker
+ */
+ static bool IsInCanvasThreadOrWorker();
+
+ /**
+ * Static method to dispatch a runnable to the canvas thread. If there is no
+ * canvas thread this will just release aRunnable.
+ * @param aRunnable the runnable to dispatch
+ */
+ static void MaybeDispatchToCanvasThread(
+ already_AddRefed<nsIRunnable> aRunnable);
+
+ /**
+ * Dispatch a runnable to the canvas thread.
+ * @param aRunnable the runnable to dispatch
+ */
+ void DispatchToCanvasThread(already_AddRefed<nsIRunnable> aRunnable);
+
+ /**
+ * Create a TaskQueue for the canvas worker threads. This must be shutdown
+ * before the reference to CanvasThreadHolder is dropped.
+ * @return a TaskQueue that dispatches to the canvas worker threads
+ */
+ already_AddRefed<TaskQueue> CreateWorkerTaskQueue();
+
+ private:
+ static StaticDataMutex<StaticRefPtr<CanvasThreadHolder>> sCanvasThreadHolder;
+
+ CanvasThreadHolder(already_AddRefed<nsISerialEventTarget> aCanvasThread,
+ already_AddRefed<nsIThreadPool> aCanvasWorkers);
+
+ ~CanvasThreadHolder();
+
+ nsCOMPtr<nsISerialEventTarget> mCanvasThread;
+ RefPtr<nsIThreadPool> mCanvasWorkers;
+
+ // Hold a reference to prevent the compositor thread ending.
+ RefPtr<CompositorThreadHolder> mCompositorThreadKeepAlive;
+};
+
+} // namespace layers
+} // namespace mozilla
+
+#endif // mozilla_layers_CanvasThread_h