Streamline the presentation of ImageBitmapRenderingContext

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 104 matching lines @@
   // be nullptr.
   sk_sp<SkColorSpace> skSurfaceColorSpace() const;
   SkColorType colorType() const;
   ColorBehavior colorBehaviorForMediaDrawnToCanvas() const;
   bool skSurfacesUseColorSpace() const;
 
   virtual PassRefPtr<Image> getImage(AccelerationHint,
                                      SnapshotReason) const = 0;
   virtual ImageData* toImageData(SnapshotReason reason) { return nullptr; }
   virtual ContextType getContextType() const = 0;
-  virtual bool isAccelerated() const { return false; }
+  virtual bool isComposited() const = 0;
+  virtual bool isAccelerated() const = 0;
   virtual bool shouldAntialias() const { return false; }
   virtual void setIsHidden(bool) = 0;
   virtual bool isContextLost() const { return true; }
   virtual void setCanvasGetContextResult(RenderingContext&) { NOTREACHED(); };
   virtual void setOffscreenCanvasGetContextResult(OffscreenRenderingContext&) {
     NOTREACHED();
   }
   virtual bool isPaintable() const = 0;
   virtual void didDraw(const SkIRect& dirtyRect);
+  virtual void didDraw();
 
   // Return true if the content is updated.
   virtual bool paintRenderingResultsToCanvas(SourceDrawingBuffer) {
     return false;
   }
 
   virtual WebLayer* platformLayer() const { return nullptr; }
 
   enum LostContextMode {
     NotLostContext,
@@ skipping 71 matching lines @@
 
  protected:
   CanvasRenderingContext(HTMLCanvasElement*,
                          OffscreenCanvas*,
                          const CanvasContextCreationAttributes&);
   DECLARE_VIRTUAL_TRACE();
   virtual void stop() = 0;
 
  private:
   void dispose();
+  void scheduleFinalizeFrameIfNeeded();
 
   Member<HTMLCanvasElement> m_canvas;
   Member<OffscreenCanvas> m_offscreenCanvas;
   HashSet<String> m_cleanURLs;
   HashSet<String> m_dirtyURLs;
   CanvasColorSpace m_colorSpace;
   CanvasPixelFormat m_pixelFormat;
   bool m_linearPixelMath = false;
   CanvasContextCreationAttributes m_creationAttributes;
   bool m_finalizeFrameScheduled = false;
 };
 
 }  // namespace blink
 
 #endif