Add decode() functionality to image elements.

third_party/WebKit/Source/core/html/HTMLImageElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 14 matching lines @@
 #define HTMLImageElement_h
 
 #include "bindings/core/v8/ActiveScriptWrappable.h"
 #include "core/CoreExport.h"
 #include "core/html/FormAssociated.h"
 #include "core/html/HTMLElement.h"
 #include "core/html/HTMLImageLoader.h"
 #include "core/html/canvas/CanvasImageElementSource.h"
 #include "core/imagebitmap/ImageBitmapSource.h"
 #include "platform/graphics/GraphicsTypes.h"
+#include "platform/heap/HeapAllocator.h"
 #include "platform/loader/fetch/FetchRequest.h"
 #include "platform/loader/fetch/ResourceResponse.h"
 
 namespace blink {
 
 class HTMLFormElement;
 class ImageCandidate;
 class ShadowRoot;
 class ImageBitmapOptions;
 
@@ skipping 47 matching lines @@
   void setHeight(unsigned);
 
   KURL src() const;
   void setSrc(const String&);
 
   void setWidth(unsigned);
 
   int x() const;
   int y() const;
 
+  ScriptPromise decode(ScriptState*, ExceptionState&);
+
   bool complete() const;
 
   bool hasPendingActivity() const final {
     return imageLoader().hasPendingActivity();
   }
 
   bool canContainRangeEndPoint() const override { return false; }
 
   const AtomicString imageSourceURL() const override;
 
@@ skipping 22 matching lines @@
   IntSize bitmapSourceSize() const override;
   ScriptPromise createImageBitmap(ScriptState*,
                                   EventTarget&,
                                   Optional<IntRect> cropRect,
                                   const ImageBitmapOptions&,
                                   ExceptionState&) override;
 
   FormAssociated* toFormAssociatedOrNull() override { return this; };
   void associateWith(HTMLFormElement*) override;
 
+  void imageNotifyFinished(bool success);
+
  protected:
   // Controls how an image element appears in the layout. See:
   // https://html.spec.whatwg.org/multipage/embedded-content.html#image-request
   enum class LayoutDisposition : uint8_t {
     // Displayed as a partially or completely loaded image. Corresponds to the
     // `current request` state being: `unavailable`, `partially available`, or
     // `completely available`.
     PrimaryContent,
     // Showing a broken image icon and 'alt' text, if any. Corresponds to the
     // `current request` being in the `broken` state.
@@ skipping 40 matching lines @@
   bool isInteractiveContent() const override;
   Image* imageContents() override;
 
   void resetFormOwner();
   ImageCandidate findBestFitImageFromPictureParent();
   void setBestFitURLAndDPRFromImageCandidate(const ImageCandidate&);
   HTMLImageLoader& imageLoader() const override { return *m_imageLoader; }
   void notifyViewportChanged();
   void createMediaQueryListIfDoesNotExist();
 
+  void requestDecode();
+  void didDecode(bool success);
+
   Member<HTMLImageLoader> m_imageLoader;
   Member<ViewportChangeListener> m_listener;
   Member<HTMLFormElement> m_form;
   AtomicString m_bestFitImageURL;
   float m_imageDevicePixelRatio;
   Member<HTMLSourceElement> m_source;
   LayoutDisposition m_layoutDisposition;
   unsigned m_formWasSetByParser : 1;
   unsigned m_elementCreatedByParser : 1;
   unsigned m_isFallbackImage : 1;
+  HeapVector<Member<ScriptPromiseResolver>> m_decodePromiseResolvers;
 
   ReferrerPolicy m_referrerPolicy;
+
+  WTF::WeakPtrFactory<HTMLImageElement> m_weakPtrFactory;
 };
 
 }  // namespace blink
 
 #endif  // HTMLImageElement_h