dom/canvas/OffscreenCanvasRenderingContext2D.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim:set ts=2 sw=2 sts=2 et cindent: */
   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
   7 #ifndef MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_
   8 #define MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_
   9
  10 #include "mozilla/RefPtr.h"
  11 #include "mozilla/dom/CanvasRenderingContext2D.h"
  12
  13 struct JSContext;
  14 class nsIGlobalObject;
  15
  16 namespace mozilla::dom {
  17 class OffscreenCanvas;
  18 class OffscreenCanvasShutdownObserver;
  19 class WeakWorkerRef;
  20
  21 class OffscreenCanvasRenderingContext2D final
  22     : public CanvasRenderingContext2D {
  23  public:
  24   // nsISupports interface + CC
  25   NS_DECL_ISUPPORTS_INHERITED
  26   NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED(
  27       OffscreenCanvasRenderingContext2D, CanvasRenderingContext2D)
  28
  29   explicit OffscreenCanvasRenderingContext2D(
  30       layers::LayersBackend aCompositorBackend);
  31
  32   nsIGlobalObject* GetParentObject() const;
  33
  34   JSObject* WrapObject(JSContext* aCx,
  35                        JS::Handle<JSObject*> aGivenProto) override;
  36
  37   OffscreenCanvas* Canvas() { return mOffscreenCanvas; }
  38   const OffscreenCanvas* Canvas() const { return mOffscreenCanvas; }
  39
  40   void Commit(ErrorResult& aRv);
  41
  42   void OnShutdown() override;
  43
  44   NS_IMETHOD InitializeWithDrawTarget(
  45       nsIDocShell* aShell, NotNull<gfx::DrawTarget*> aTarget) override;
  46
  47  private:
  48   void AddShutdownObserver() override;
  49   void RemoveShutdownObserver() override;
  50   bool AlreadyShutDown() const override {
  51     return !mOffscreenShutdownObserver &&
  52            CanvasRenderingContext2D::AlreadyShutDown();
  53   }
  54
  55   void AddZoneWaitingForGC() override;
  56   void AddAssociatedMemory() override;
  57   void RemoveAssociatedMemory() override;
  58
  59   ~OffscreenCanvasRenderingContext2D() override;
  60
  61   RefPtr<OffscreenCanvasShutdownObserver> mOffscreenShutdownObserver;
  62   RefPtr<WeakWorkerRef> mWorkerRef;
  63 };
  64
  65 size_t BindingJSObjectMallocBytes(OffscreenCanvasRenderingContext2D* aContext);
  66
  67 }  // namespace mozilla::dom
  68
  69 #endif  // MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_