Revert of move annotations to canvas virtual

include/core/SkAnnotation.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkAnnotation_DEFINED
 #define SkAnnotation_DEFINED
 
+#include "SkRefCnt.h"
+#include "SkString.h"
 #include "SkTypes.h"
 
 class SkData;
+class SkReadBuffer;
+class SkWriteBuffer;
 struct SkPoint;
+
+/**
+ *  Experimental class for annotating draws. Do not use directly yet.
+ *  Use helper functions at the bottom of this file for now.
+ */
+class SkAnnotation : public SkRefCnt {
+public:
+    virtual ~SkAnnotation();
+
+    static SkAnnotation* Create(const char key[], SkData* value) {
+        return new SkAnnotation(key, value);
+    }
+
+    static SkAnnotation* Create(SkReadBuffer& buffer) { return new SkAnnotation(buffer); }
+
+    /**
+     *  Return the data for the specified key, or NULL.
+     */
+    SkData* find(const char key[]) const;
+
+    void writeToBuffer(SkWriteBuffer&) const;
+
+private:
+    SkAnnotation(const char key[], SkData* value);
+    SkAnnotation(SkReadBuffer&);
+
+    SkString    fKey;
+    SkData*     fData;
+
+    typedef SkRefCnt INHERITED;
+};
+
+/**
+ *  Experimental collection of predefined Keys into the Annotation dictionary
+ */
+class SkAnnotationKeys {
+public:
+    /**
+     *  Returns the canonical key whose payload is a URL
+     */
+    static const char* URL_Key();
+
+    /**
+     *  Returns the canonical key whose payload is the name of a destination to
+     *  be defined.
+     */
+    static const char* Define_Named_Dest_Key();
+
+    /**
+     *  Returns the canonical key whose payload is the name of a destination to
+     *  be linked to.
+     */
+    static const char* Link_Named_Dest_Key();
+};
+
+///////////////////////////////////////////////////////////////////////////////
+//
+// Experimental helper functions to use Annotations
+//
+
 struct SkRect;
 class SkCanvas;
 
 /**
+ *  Experimental!
+ *
  *  Annotate the canvas by associating the specified URL with the
- *  specified rectangle (in local coordinates, just like drawRect).
- *
- *  If the backend of this canvas does not support annotations, this call is
+ *  specified rectangle (in local coordinates, just like drawRect). If the
+ *  backend of this canvas does not support annotations, this call is
  *  safely ignored.
  *
  *  The caller is responsible for managing its ownership of the SkData.
  */
 SK_API void SkAnnotateRectWithURL(SkCanvas*, const SkRect&, SkData*);
 
 /**
+ *  Experimental!
+ *
  *  Annotate the canvas by associating a name with the specified point.
  *
  *  If the backend of this canvas does not support annotations, this call is
  *  safely ignored.
  *
  *  The caller is responsible for managing its ownership of the SkData.
  */
 SK_API void SkAnnotateNamedDestination(SkCanvas*, const SkPoint&, SkData*);
 
 /**
+ *  Experimental!
+ *
  *  Annotate the canvas by making the specified rectangle link to a named
  *  destination.
  *
  *  If the backend of this canvas does not support annotations, this call is
  *  safely ignored.
  *
  *  The caller is responsible for managing its ownership of the SkData.
  */
 SK_API void SkAnnotateLinkToDestination(SkCanvas*, const SkRect&, SkData*);
 
+
 #endif