85 lines
2.6 KiB
C++
85 lines
2.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef _include_gfx_ipc_CanvasRenderThread_h__
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#define _include_gfx_ipc_CanvasRenderThread_h__
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#include "mozilla/AlreadyAddRefed.h"
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#include "mozilla/Mutex.h"
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#include "nsCOMPtr.h"
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#include "nsISupportsImpl.h"
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#include "nsTArray.h"
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class nsIRunnable;
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class nsIThread;
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class nsIThreadPool;
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namespace mozilla {
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class TaskQueue;
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namespace gfx {
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/**
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* This class represents the virtual thread for canvas rendering. Depending on
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* platform requirements and user configuration, canvas rendering may happen on
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* the Compositor thread, Render thread or the CanvasRender thread.
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*/
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class CanvasRenderThread final {
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING_WITH_DELETE_ON_MAIN_THREAD(
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CanvasRenderThread)
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public:
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/// Can only be called from the main thread, expected to be called at most
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/// once during a process' lifetime. Must be called after the Compositor and
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/// Render threads are initialized.
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static void Start();
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/// Can only be called from the main thread. Must be called before the
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/// Compositor and Render threads are shutdown.
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static void Shutdown();
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/// Can be called from any thread.
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static bool IsInCanvasRenderThread();
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/// Can be called from any thread.
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static bool IsInCanvasWorkerThread();
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/// Can be called from any thread.
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static bool IsInCanvasRenderOrWorkerThread();
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/// Can be called from any thread, may return nullptr late in shutdown.
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static already_AddRefed<nsIThread> GetCanvasRenderThread();
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static already_AddRefed<TaskQueue> CreateWorkerTaskQueue();
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static void ShutdownWorkerTaskQueue(TaskQueue* aTaskQueue);
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static void FinishShutdownWorkerTaskQueue(TaskQueue* aTaskQueue);
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static void Dispatch(already_AddRefed<nsIRunnable> aRunnable);
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private:
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CanvasRenderThread(nsCOMPtr<nsIThread>&& aThread,
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nsCOMPtr<nsIThreadPool>&& aWorkers, bool aCreatedThread);
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~CanvasRenderThread();
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Mutex mMutex;
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nsCOMPtr<nsIThread> const mThread;
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nsCOMPtr<nsIThreadPool> const mWorkers;
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nsTArray<RefPtr<TaskQueue>> mPendingShutdownTaskQueues MOZ_GUARDED_BY(mMutex);
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// True if mThread points to CanvasRender thread, false if mThread points to
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// Compositor/Render thread.
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const bool mCreatedThread;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // _include_gfx_ipc_CanvasRenderThread_h__
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