Add m-esr52 at 52.6.0

1 files changed, 214 insertions, 0 deletions

diff --git a/dom/canvas/OffscreenCanvas.h b/dom/canvas/OffscreenCanvas.h
new file mode 100644
index 000000000..759543942
--- /dev/null
+++ b/dom/canvas/OffscreenCanvas.h
@@ -0,0 +1,214 @@
+/* -*- 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_OFFSCREENCANVAS_H_
+#define MOZILLA_DOM_OFFSCREENCANVAS_H_
+
+#include "mozilla/DOMEventTargetHelper.h"
+#include "mozilla/layers/LayersTypes.h"
+#include "mozilla/RefPtr.h"
+#include "CanvasRenderingContextHelper.h"
+#include "nsCycleCollectionParticipant.h"
+
+struct JSContext;
+
+namespace mozilla {
+
+class ErrorResult;
+
+namespace layers {
+class AsyncCanvasRenderer;
+class CanvasClient;
+} // namespace layers
+
+namespace dom {
+class Blob;
+class ImageBitmap;
+
+// This is helper class for transferring OffscreenCanvas to worker thread.
+// Because OffscreenCanvas is not thread-safe. So we cannot pass Offscreen-
+// Canvas to worker thread directly. Thus, we create this helper class and
+// store necessary data in it then pass it to worker thread.
+struct OffscreenCanvasCloneData final
+{
+  OffscreenCanvasCloneData(layers::AsyncCanvasRenderer* aRenderer,
+                           uint32_t aWidth, uint32_t aHeight,
+                           layers::LayersBackend aCompositorBackend,
+                           bool aNeutered, bool aIsWriteOnly);
+  ~OffscreenCanvasCloneData();
+
+  RefPtr<layers::AsyncCanvasRenderer> mRenderer;
+  uint32_t mWidth;
+  uint32_t mHeight;
+  layers::LayersBackend mCompositorBackendType;
+  bool mNeutered;
+  bool mIsWriteOnly;
+};
+
+class OffscreenCanvas final : public DOMEventTargetHelper
+                            , public CanvasRenderingContextHelper
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(OffscreenCanvas, DOMEventTargetHelper)
+
+  OffscreenCanvas(nsIGlobalObject* aGlobal,
+                  uint32_t aWidth,
+                  uint32_t aHeight,
+                  layers::LayersBackend aCompositorBackend,
+                  layers::AsyncCanvasRenderer* aRenderer);
+
+  nsCOMPtr<nsIGlobalObject> GetParentObject() const { return GetOwnerGlobal(); }
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+
+  static already_AddRefed<OffscreenCanvas>
+  Constructor(const GlobalObject& aGlobal,
+              uint32_t aWidth,
+              uint32_t aHeight,
+              ErrorResult& aRv);
+
+  void ClearResources();
+
+  uint32_t Width() const
+  {
+    return mWidth;
+  }
+
+  uint32_t Height() const
+  {
+    return mHeight;
+  }
+
+  void SetWidth(uint32_t aWidth, ErrorResult& aRv)
+  {
+    if (mNeutered) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    if (mWidth != aWidth) {
+      mWidth = aWidth;
+      CanvasAttrChanged();
+    }
+  }
+
+  void SetHeight(uint32_t aHeight, ErrorResult& aRv)
+  {
+    if (mNeutered) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    if (mHeight != aHeight) {
+      mHeight = aHeight;
+      CanvasAttrChanged();
+    }
+  }
+
+  already_AddRefed<ImageBitmap>
+  TransferToImageBitmap();
+
+  already_AddRefed<Promise>
+  ToBlob(JSContext* aCx,
+         const nsAString& aType,
+         JS::Handle<JS::Value> aParams,
+         ErrorResult& aRv);
+
+  nsICanvasRenderingContextInternal* GetContext() const
+  {
+    return mCurrentContext;
+  }
+
+  already_AddRefed<gfx::SourceSurface> GetSurfaceSnapshot(bool* aPremultAlpha = nullptr);
+
+  static already_AddRefed<OffscreenCanvas>
+  CreateFromCloneData(nsIGlobalObject* aGlobal, OffscreenCanvasCloneData* aData);
+
+  static bool PrefEnabled(JSContext* aCx, JSObject* aObj);
+
+  // Return true on main-thread, and return gfx.offscreencanvas.enabled
+  // on worker thread.
+  static bool PrefEnabledOnWorkerThread(JSContext* aCx, JSObject* aObj);
+
+  OffscreenCanvasCloneData* ToCloneData();
+
+  void CommitFrameToCompositor();
+
+  virtual bool GetOpaqueAttr() override
+  {
+    return false;
+  }
+
+  virtual nsIntSize GetWidthHeight() override
+  {
+    return nsIntSize(mWidth, mHeight);
+  }
+
+  virtual already_AddRefed<nsICanvasRenderingContextInternal>
+  CreateContext(CanvasContextType aContextType) override;
+
+  virtual already_AddRefed<nsISupports>
+  GetContext(JSContext* aCx,
+             const nsAString& aContextId,
+             JS::Handle<JS::Value> aContextOptions,
+             ErrorResult& aRv) override;
+
+  void SetNeutered()
+  {
+    mNeutered = true;
+  }
+
+  bool IsNeutered() const
+  {
+    return mNeutered;
+  }
+
+  void SetWriteOnly()
+  {
+    mIsWriteOnly = true;
+  }
+
+  bool IsWriteOnly() const
+  {
+    return mIsWriteOnly;
+  }
+
+  layers::LayersBackend GetCompositorBackendType() const
+  {
+    return mCompositorBackendType;
+  }
+
+private:
+  ~OffscreenCanvas();
+
+  nsCOMPtr<nsIGlobalObject> GetGlobalObject();
+
+  void CanvasAttrChanged()
+  {
+    mAttrDirty = true;
+    ErrorResult dummy;
+    UpdateContext(nullptr, JS::NullHandleValue, dummy);
+  }
+
+  bool mAttrDirty;
+  bool mNeutered;
+  bool mIsWriteOnly;
+
+  uint32_t mWidth;
+  uint32_t mHeight;
+
+  layers::LayersBackend mCompositorBackendType;
+
+  RefPtr<layers::CanvasClient> mCanvasClient;
+  RefPtr<layers::AsyncCanvasRenderer> mCanvasRenderer;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif // MOZILLA_DOM_OFFSCREENCANVAS_H_