gfx/ipc/CanvasShutdownManager.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6 #ifndef _include_gfx_ipc_CanvasShutdownManager_h__
   7 #define _include_gfx_ipc_CanvasShutdownManager_h__
   8
   9 #include "mozilla/RefPtr.h"
  10 #include "mozilla/StaticMutex.h"
  11 #include "mozilla/ThreadLocal.h"
  12 #include <set>
  13
  14 namespace mozilla {
  15 namespace dom {
  16 class CanvasRenderingContext2D;
  17 class StrongWorkerRef;
  18 class ThreadSafeWorkerRef;
  19 }  // namespace dom
  20
  21 namespace gfx {
  22
  23 class CanvasShutdownManager final {
  24  public:
  25   static CanvasShutdownManager* Get();
  26   static CanvasShutdownManager* MaybeGet();
  27   static void Shutdown();
  28
  29   dom::ThreadSafeWorkerRef* GetWorkerRef() const { return mWorkerRef; }
  30   void AddShutdownObserver(dom::CanvasRenderingContext2D* aCanvas);
  31   void RemoveShutdownObserver(dom::CanvasRenderingContext2D* aCanvas);
  32
  33   static void OnCompositorManagerRestored();
  34
  35   void OnRemoteCanvasLost();
  36   void OnRemoteCanvasRestored();
  37
  38  private:
  39   explicit CanvasShutdownManager(dom::StrongWorkerRef* aWorkerRef);
  40   CanvasShutdownManager();
  41   ~CanvasShutdownManager();
  42   void Destroy();
  43
  44   static void MaybeRestoreRemoteCanvas();
  45
  46   RefPtr<dom::ThreadSafeWorkerRef> mWorkerRef;
  47   std::set<dom::CanvasRenderingContext2D*> mActiveCanvas;
  48   static MOZ_THREAD_LOCAL(CanvasShutdownManager*) sLocalManager;
  49
  50   static StaticMutex sManagersMutex;
  51   static std::set<CanvasShutdownManager*> sManagers;
  52 };
  53
  54 }  // namespace gfx
  55 }  // namespace mozilla
  56
  57 #endif  // _include_gfx_ipc_CanvasShutdownManager_h__