Add m-esr52 at 52.6.0

1 files changed, 452 insertions, 0 deletions

diff --git a/dom/html/HTMLCanvasElement.h b/dom/html/HTMLCanvasElement.h
new file mode 100644
index 000000000..81c141d3c
--- /dev/null
+++ b/dom/html/HTMLCanvasElement.h
@@ -0,0 +1,452 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+#if !defined(mozilla_dom_HTMLCanvasElement_h)
+#define mozilla_dom_HTMLCanvasElement_h
+
+#include "mozilla/Attributes.h"
+#include "mozilla/WeakPtr.h"
+#include "nsIDOMEventListener.h"
+#include "nsIDOMHTMLCanvasElement.h"
+#include "nsIObserver.h"
+#include "nsGenericHTMLElement.h"
+#include "nsGkAtoms.h"
+#include "nsSize.h"
+#include "nsError.h"
+
+#include "mozilla/dom/CanvasRenderingContextHelper.h"
+#include "mozilla/gfx/Rect.h"
+#include "mozilla/layers/LayersTypes.h"
+
+class nsICanvasRenderingContextInternal;
+class nsITimerCallback;
+
+namespace mozilla {
+
+class WebGLContext;
+
+namespace layers {
+class AsyncCanvasRenderer;
+class CanvasLayer;
+class Image;
+class Layer;
+class LayerManager;
+class SharedSurfaceTextureClient;
+} // namespace layers
+namespace gfx {
+class SourceSurface;
+class VRLayerChild;
+} // namespace gfx
+
+namespace dom {
+class BlobCallback;
+class CanvasCaptureMediaStream;
+class File;
+class HTMLCanvasPrintState;
+class OffscreenCanvas;
+class PrintCallback;
+class RequestedFrameRefreshObserver;
+
+// Listen visibilitychange and memory-pressure event and inform
+// context when event is fired.
+class HTMLCanvasElementObserver final : public nsIObserver
+                                      , public nsIDOMEventListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIOBSERVER
+  NS_DECL_NSIDOMEVENTLISTENER
+
+  explicit HTMLCanvasElementObserver(HTMLCanvasElement* aElement);
+  void Destroy();
+
+  void RegisterVisibilityChangeEvent();
+  void UnregisterVisibilityChangeEvent();
+
+  void RegisterMemoryPressureEvent();
+  void UnregisterMemoryPressureEvent();
+
+private:
+  ~HTMLCanvasElementObserver();
+
+  HTMLCanvasElement* mElement;
+};
+
+/*
+ * FrameCaptureListener is used by captureStream() as a way of getting video
+ * frames from the canvas. On a refresh driver tick after something has been
+ * drawn to the canvas since the last such tick, all registered
+ * FrameCaptureListeners whose `mFrameCaptureRequested` equals `true`,
+ * will be given a copy of the just-painted canvas.
+ * All FrameCaptureListeners get the same copy.
+ */
+class FrameCaptureListener : public SupportsWeakPtr<FrameCaptureListener>
+{
+public:
+  MOZ_DECLARE_WEAKREFERENCE_TYPENAME(FrameCaptureListener)
+
+  FrameCaptureListener()
+    : mFrameCaptureRequested(false) {}
+
+  /*
+   * Called when a frame capture is desired on next paint.
+   */
+  void RequestFrameCapture() { mFrameCaptureRequested = true; }
+
+  /*
+   * Indicates to the canvas whether or not this listener has requested a frame.
+   */
+  bool FrameCaptureRequested() const { return mFrameCaptureRequested; }
+
+  /*
+   * Interface through which new video frames will be provided while
+   * `mFrameCaptureRequested` is `true`.
+   */
+  virtual void NewFrame(already_AddRefed<layers::Image> aImage) = 0;
+
+protected:
+  virtual ~FrameCaptureListener() {}
+
+  bool mFrameCaptureRequested;
+};
+
+class HTMLCanvasElement final : public nsGenericHTMLElement,
+                                public nsIDOMHTMLCanvasElement,
+                                public CanvasRenderingContextHelper
+{
+  enum {
+    DEFAULT_CANVAS_WIDTH = 300,
+    DEFAULT_CANVAS_HEIGHT = 150
+  };
+
+  typedef layers::AsyncCanvasRenderer AsyncCanvasRenderer;
+  typedef layers::CanvasLayer CanvasLayer;
+  typedef layers::Layer Layer;
+  typedef layers::LayerManager LayerManager;
+
+public:
+  explicit HTMLCanvasElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo);
+
+  NS_IMPL_FROMCONTENT_HTML_WITH_TAG(HTMLCanvasElement, canvas)
+
+  // nsISupports
+  NS_DECL_ISUPPORTS_INHERITED
+
+  // nsIDOMHTMLCanvasElement
+  NS_DECL_NSIDOMHTMLCANVASELEMENT
+
+  // CC
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(HTMLCanvasElement,
+                                           nsGenericHTMLElement)
+
+  // WebIDL
+  uint32_t Height()
+  {
+    return GetUnsignedIntAttr(nsGkAtoms::height, DEFAULT_CANVAS_HEIGHT);
+  }
+  void SetHeight(uint32_t aHeight, ErrorResult& aRv)
+  {
+    if (mOffscreenCanvas) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    SetUnsignedIntAttr(nsGkAtoms::height, aHeight, DEFAULT_CANVAS_HEIGHT, aRv);
+  }
+  uint32_t Width()
+  {
+    return GetUnsignedIntAttr(nsGkAtoms::width, DEFAULT_CANVAS_WIDTH);
+  }
+  void SetWidth(uint32_t aWidth, ErrorResult& aRv)
+  {
+    if (mOffscreenCanvas) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    SetUnsignedIntAttr(nsGkAtoms::width, aWidth, DEFAULT_CANVAS_WIDTH, aRv);
+  }
+
+  virtual already_AddRefed<nsISupports>
+  GetContext(JSContext* aCx, const nsAString& aContextId,
+             JS::Handle<JS::Value> aContextOptions,
+             ErrorResult& aRv) override;
+
+  void ToDataURL(JSContext* aCx, const nsAString& aType,
+                 JS::Handle<JS::Value> aParams,
+                 nsAString& aDataURL, ErrorResult& aRv)
+  {
+    aRv = ToDataURL(aType, aParams, aCx, aDataURL);
+  }
+
+  void ToBlob(JSContext* aCx,
+              BlobCallback& aCallback,
+              const nsAString& aType,
+              JS::Handle<JS::Value> aParams,
+              ErrorResult& aRv);
+
+  OffscreenCanvas* TransferControlToOffscreen(ErrorResult& aRv);
+
+  bool MozOpaque() const
+  {
+    return GetBoolAttr(nsGkAtoms::moz_opaque);
+  }
+  void SetMozOpaque(bool aValue, ErrorResult& aRv)
+  {
+    if (mOffscreenCanvas) {
+      aRv.Throw(NS_ERROR_FAILURE);
+      return;
+    }
+
+    SetHTMLBoolAttr(nsGkAtoms::moz_opaque, aValue, aRv);
+  }
+  already_AddRefed<File> MozGetAsFile(const nsAString& aName,
+                                      const nsAString& aType,
+                                      ErrorResult& aRv);
+  already_AddRefed<nsISupports> MozGetIPCContext(const nsAString& aContextId,
+                                                 ErrorResult& aRv)
+  {
+    nsCOMPtr<nsISupports> context;
+    aRv = MozGetIPCContext(aContextId, getter_AddRefs(context));
+    return context.forget();
+  }
+  PrintCallback* GetMozPrintCallback() const;
+  void SetMozPrintCallback(PrintCallback* aCallback);
+
+  already_AddRefed<CanvasCaptureMediaStream>
+  CaptureStream(const Optional<double>& aFrameRate, ErrorResult& aRv);
+
+  /**
+   * Get the size in pixels of this canvas element
+   */
+  nsIntSize GetSize();
+
+  /**
+   * Determine whether the canvas is write-only.
+   */
+  bool IsWriteOnly();
+
+  /**
+   * Force the canvas to be write-only.
+   */
+  void SetWriteOnly();
+
+  /**
+   * Notify that some canvas content has changed and the window may
+   * need to be updated. aDamageRect is in canvas coordinates.
+   */
+  void InvalidateCanvasContent(const mozilla::gfx::Rect* aDamageRect);
+  /*
+   * Notify that we need to repaint the entire canvas, including updating of
+   * the layer tree.
+   */
+  void InvalidateCanvas();
+
+  /*
+   * Get the number of contexts in this canvas, and request a context at
+   * an index.
+   */
+  int32_t CountContexts ();
+  nsICanvasRenderingContextInternal *GetContextAtIndex (int32_t index);
+
+  /*
+   * Returns true if the canvas context content is guaranteed to be opaque
+   * across its entire area.
+   */
+  bool GetIsOpaque();
+  virtual bool GetOpaqueAttr() override;
+
+  virtual already_AddRefed<gfx::SourceSurface> GetSurfaceSnapshot(bool* aPremultAlpha = nullptr);
+
+  /*
+   * Register a FrameCaptureListener with this canvas.
+   * The canvas hooks into the RefreshDriver while there are
+   * FrameCaptureListeners registered.
+   * The registered FrameCaptureListeners are stored as WeakPtrs, thus it's the
+   * caller's responsibility to keep them alive. Once a registered
+   * FrameCaptureListener is destroyed it will be automatically deregistered.
+   */
+  nsresult RegisterFrameCaptureListener(FrameCaptureListener* aListener);
+
+  /*
+   * Returns true when there is at least one registered FrameCaptureListener
+   * that has requested a frame capture.
+   */
+  bool IsFrameCaptureRequested() const;
+
+  /*
+   * Processes destroyed FrameCaptureListeners and removes them if necessary.
+   * Should there be none left, the FrameRefreshObserver will be unregistered.
+   */
+  void ProcessDestroyedFrameListeners();
+
+  /*
+   * Called by the RefreshDriver hook when a frame has been captured.
+   * Makes a copy of the provided surface and hands it to all
+   * FrameCaptureListeners having requested frame capture.
+   */
+  void SetFrameCapture(already_AddRefed<gfx::SourceSurface> aSurface);
+
+  virtual bool ParseAttribute(int32_t aNamespaceID,
+                                nsIAtom* aAttribute,
+                                const nsAString& aValue,
+                                nsAttrValue& aResult) override;
+  nsChangeHint GetAttributeChangeHint(const nsIAtom* aAttribute, int32_t aModType) const override;
+
+  // SetAttr override.  C++ is stupid, so have to override both
+  // overloaded methods.
+  nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                   const nsAString& aValue, bool aNotify)
+  {
+    return SetAttr(aNameSpaceID, aName, nullptr, aValue, aNotify);
+  }
+  virtual nsresult SetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                           nsIAtom* aPrefix, const nsAString& aValue,
+                           bool aNotify) override;
+
+  virtual nsresult UnsetAttr(int32_t aNameSpaceID, nsIAtom* aName,
+                             bool aNotify) override;
+
+  virtual nsresult Clone(mozilla::dom::NodeInfo *aNodeInfo, nsINode **aResult) const override;
+  nsresult CopyInnerTo(mozilla::dom::Element* aDest);
+
+  virtual nsresult PreHandleEvent(mozilla::EventChainPreVisitor& aVisitor) override;
+
+  /*
+   * Helpers called by various users of Canvas
+   */
+
+  already_AddRefed<Layer> GetCanvasLayer(nsDisplayListBuilder* aBuilder,
+                                         Layer *aOldLayer,
+                                         LayerManager *aManager);
+  // Should return true if the canvas layer should always be marked inactive.
+  // We should return true here if we can't do accelerated compositing with
+  // a non-BasicCanvasLayer.
+  bool ShouldForceInactiveLayer(LayerManager *aManager);
+
+  // Call this whenever we need future changes to the canvas
+  // to trigger fresh invalidation requests. This needs to be called
+  // whenever we render the canvas contents to the screen, or whenever we
+  // take a snapshot of the canvas that needs to be "live" (e.g. -moz-element).
+  void MarkContextClean();
+
+  // Call this after capturing a frame, so we can avoid unnecessary surface
+  // copies for future frames when no drawing has occurred.
+  void MarkContextCleanForFrameCapture();
+
+  // Starts returning false when something is drawn.
+  bool IsContextCleanForFrameCapture();
+
+  nsresult GetContext(const nsAString& aContextId, nsISupports** aContext);
+
+  layers::LayersBackend GetCompositorBackendType() const;
+
+  void OnVisibilityChange();
+
+  void OnMemoryPressure();
+
+  static void SetAttrFromAsyncCanvasRenderer(AsyncCanvasRenderer *aRenderer);
+  static void InvalidateFromAsyncCanvasRenderer(AsyncCanvasRenderer *aRenderer);
+
+  void StartVRPresentation();
+  void StopVRPresentation();
+  already_AddRefed<layers::SharedSurfaceTextureClient> GetVRFrame();
+
+protected:
+  virtual ~HTMLCanvasElement();
+
+  virtual JSObject* WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
+
+  virtual nsIntSize GetWidthHeight() override;
+
+  virtual already_AddRefed<nsICanvasRenderingContextInternal>
+  CreateContext(CanvasContextType aContextType) override;
+
+  nsresult ExtractData(nsAString& aType,
+                       const nsAString& aOptions,
+                       nsIInputStream** aStream);
+  nsresult ToDataURLImpl(JSContext* aCx,
+                         const nsAString& aMimeType,
+                         const JS::Value& aEncoderOptions,
+                         nsAString& aDataURL);
+  nsresult MozGetAsBlobImpl(const nsAString& aName,
+                            const nsAString& aType,
+                            nsISupports** aResult);
+  void CallPrintCallback();
+
+  AsyncCanvasRenderer* GetAsyncCanvasRenderer();
+
+  bool mResetLayer;
+  RefPtr<HTMLCanvasElement> mOriginalCanvas;
+  RefPtr<PrintCallback> mPrintCallback;
+  RefPtr<HTMLCanvasPrintState> mPrintState;
+  nsTArray<WeakPtr<FrameCaptureListener>> mRequestedFrameListeners;
+  RefPtr<RequestedFrameRefreshObserver> mRequestedFrameRefreshObserver;
+  RefPtr<AsyncCanvasRenderer> mAsyncCanvasRenderer;
+  RefPtr<OffscreenCanvas> mOffscreenCanvas;
+  RefPtr<HTMLCanvasElementObserver> mContextObserver;
+  bool mVRPresentationActive;
+
+public:
+  // Record whether this canvas should be write-only or not.
+  // We set this when script paints an image from a different origin.
+  // We also transitively set it when script paints a canvas which
+  // is itself write-only.
+  bool                     mWriteOnly;
+
+  bool IsPrintCallbackDone();
+
+  void HandlePrintCallback(nsPresContext::nsPresContextType aType);
+
+  nsresult DispatchPrintCallback(nsITimerCallback* aCallback);
+
+  void ResetPrintCallback();
+
+  HTMLCanvasElement* GetOriginalCanvas();
+
+  CanvasContextType GetCurrentContextType() {
+    return mCurrentContextType;
+  }
+};
+
+class HTMLCanvasPrintState final : public nsWrapperCache
+{
+public:
+  HTMLCanvasPrintState(HTMLCanvasElement* aCanvas,
+                       nsICanvasRenderingContextInternal* aContext,
+                       nsITimerCallback* aCallback);
+
+  nsISupports* Context() const;
+
+  void Done();
+
+  void NotifyDone();
+
+  bool mIsDone;
+
+  NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(HTMLCanvasPrintState)
+  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(HTMLCanvasPrintState)
+
+  virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
+
+  HTMLCanvasElement* GetParentObject()
+  {
+    return mCanvas;
+  }
+
+private:
+  ~HTMLCanvasPrintState();
+  bool mPendingNotify;
+
+protected:
+  RefPtr<HTMLCanvasElement> mCanvas;
+  nsCOMPtr<nsICanvasRenderingContextInternal> mContext;
+  nsCOMPtr<nsITimerCallback> mCallback;
+};
+
+} // namespace dom
+} // namespace mozilla
+
+#endif /* mozilla_dom_HTMLCanvasElement_h */