1 files changed, 69 insertions, 0 deletions
diff --git a/dom/canvas/OffscreenCanvasRenderingContext2D.h b/dom/canvas/OffscreenCanvasRenderingContext2D.h
new file mode 100644
index 0000000000..1a47500f6d
--- /dev/null
+++ b/dom/canvas/OffscreenCanvasRenderingContext2D.h
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_
+#define MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_
+
+#include "mozilla/RefPtr.h"
+#include "mozilla/dom/CanvasRenderingContext2D.h"
+
+struct JSContext;
+class nsIGlobalObject;
+
+namespace mozilla::dom {
+class OffscreenCanvas;
+class OffscreenCanvasShutdownObserver;
+class WeakWorkerRef;
+
+class OffscreenCanvasRenderingContext2D final
+    : public CanvasRenderingContext2D {
+ public:
+  // nsISupports interface + CC
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_SKIPPABLE_SCRIPT_HOLDER_CLASS_INHERITED(
+      OffscreenCanvasRenderingContext2D, CanvasRenderingContext2D)
+
+  explicit OffscreenCanvasRenderingContext2D(
+      layers::LayersBackend aCompositorBackend);
+
+  nsIGlobalObject* GetParentObject() const;
+
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  OffscreenCanvas* Canvas() { return mOffscreenCanvas; }
+  const OffscreenCanvas* Canvas() const { return mOffscreenCanvas; }
+
+  void Commit(ErrorResult& aRv);
+
+  void OnShutdown() override;
+
+  NS_IMETHOD InitializeWithDrawTarget(
+      nsIDocShell* aShell, NotNull<gfx::DrawTarget*> aTarget) override;
+
+ private:
+  void AddShutdownObserver() override;
+  void RemoveShutdownObserver() override;
+  bool AlreadyShutDown() const override {
+    return !mOffscreenShutdownObserver &&
+           CanvasRenderingContext2D::AlreadyShutDown();
+  }
+
+  void AddZoneWaitingForGC() override;
+  void AddAssociatedMemory() override;
+  void RemoveAssociatedMemory() override;
+
+  ~OffscreenCanvasRenderingContext2D() override;
+
+  RefPtr<OffscreenCanvasShutdownObserver> mOffscreenShutdownObserver;
+  RefPtr<WeakWorkerRef> mWorkerRef;
+};
+
+size_t BindingJSObjectMallocBytes(OffscreenCanvasRenderingContext2D* aContext);
+
+}  // namespace mozilla::dom
+
+#endif  // MOZILLA_DOM_OFFSCREENCANVASRENDERINGCONTEXT2D_H_