Cancel GPU acceleration for 2D canvas when drawing very large images

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 85 matching lines @@
     virtual void ensureFallbackForGeneratedContent();
     virtual void ensurePrimaryContent();
 
     // CanvasImageSource implementation
     PassRefPtr<Image> getSourceImageForCanvas(SourceImageStatus*, AccelerationHint, SnapshotReason, const FloatSize&) const override;
     bool isSVGSource() const override;
     bool wouldTaintOrigin(SecurityOrigin*) const override;
     FloatSize elementSize(const FloatSize&) const override;
     FloatSize defaultDestinationSize(const FloatSize&) const override;
     const KURL& sourceURL() const override;
+    bool isAccelerated() const override { return false; }
     bool isOpaque() const override;
     int sourceWidth() override;
     int sourceHeight() override;
 
     // public so that HTMLPictureElement can call this as well.
     void selectSourceURL(ImageLoader::UpdateFromElementBehavior);
     void reattachFallbackContent();
     void setUseFallbackContent();
     void setIsFallbackImage() { m_isFallbackImage = true; }
 
@@ skipping 56 matching lines @@
     unsigned m_elementCreatedByParser : 1;
     unsigned m_useFallbackContent : 1;
     unsigned m_isFallbackImage : 1;
 
     ReferrerPolicy m_referrerPolicy;
 };
 
 } // namespace blink
 
 #endif // HTMLImageElement_h