[SVG] Shared <use> path geometry

third_party/WebKit/Source/core/svg/SVGPath.h

 /*
  * Copyright (C) 2014 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #ifndef SVGPath_h
 #define SVGPath_h
 
 #include "core/svg/properties/SVGProperty.h"
 
 namespace blink {
 
 class ExceptionState;
+class Path;
 class SVGPathByteStream;
 
 class SVGPath : public SVGPropertyBase {
 public:
     typedef void TearOffType;
 
     static PassRefPtrWillBeRawPtr<SVGPath> create()
     {
         return adoptRefWillBeNoop(new SVGPath());
     }
 
     ~SVGPath() override;
 
+    const Path& path() const;
+
     const SVGPathByteStream& byteStream() const;
     SVGPathByteStream& mutableByteStream();
 
     // SVGPropertyBase:
     PassRefPtrWillBeRawPtr<SVGPath> clone() const;
     PassRefPtrWillBeRawPtr<SVGPropertyBase> cloneForAnimation(const String&) const override;
     String valueAsString() const override;
     void setValueAsString(const String&, ExceptionState&);
 
     void add(PassRefPtrWillBeRawPtr<SVGPropertyBase>, SVGElement*) override;
     void calculateAnimatedValue(SVGAnimationElement*, float percentage, unsigned repeatCount, PassRefPtrWillBeRawPtr<SVGPropertyBase> fromValue, PassRefPtrWillBeRawPtr<SVGPropertyBase> toValue, PassRefPtrWillBeRawPtr<SVGPropertyBase> toAtEndOfDurationValue, SVGElement*) override;
     float calculateDistance(PassRefPtrWillBeRawPtr<SVGPropertyBase> to, SVGElement*) override;
 
     static AnimatedPropertyType classType() { return AnimatedPath; }
 
 private:
     SVGPath();
     explicit SVGPath(PassOwnPtr<SVGPathByteStream>);
 
+    SVGPathByteStream& ensureByteStream();
+    void byteStreamWillChange();
+
     OwnPtr<SVGPathByteStream> m_byteStream;

[pdr., 2015/10/30 16:46:01]

I hope we can combine the byte stream and skpath at some point.

+    mutable OwnPtr<Path> m_cachedPath;
 };
 
 inline PassRefPtrWillBeRawPtr<SVGPath> toSVGPath(PassRefPtrWillBeRawPtr<SVGPropertyBase> passBase)
 {
     RefPtrWillBeRawPtr<SVGPropertyBase> base = passBase;
     ASSERT(base->type() == SVGPath::classType());
     return static_pointer_cast<SVGPath>(base.release());
 }
 
 } // namespace blink
 
 #endif