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content/renderer/pepper/npobject_var.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_RENDERER_PEPPER_NPOBJECT_VAR_H_
-#define CONTENT_RENDERER_PEPPER_NPOBJECT_VAR_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "ppapi/c/pp_instance.h"
-#include "ppapi/shared_impl/var.h"
-#include "content/common/content_export.h"
-
-typedef struct NPObject NPObject;
-typedef struct _NPVariant NPVariant;
-typedef void* NPIdentifier;
-
-namespace ppapi {
-
-// NPObjectVar -----------------------------------------------------------------
-
-// Represents a JavaScript object Var. By itself, this represents random
-// NPObjects that a given plugin (identified by the resource's module) wants to
-// reference. If two different modules reference the same NPObject (like the
-// "window" object), then there will be different NPObjectVar's (and hence
-// PP_Var IDs) for each module. This allows us to track all references owned by
-// a given module and free them when the plugin exits independently of other
-// plugins that may be running at the same time.
-class NPObjectVar : public Var {
- public:
-  // You should always use FromNPObject to create an NPObjectVar. This function
-  // guarantees that we maintain the 1:1 mapping between NPObject and
-  // NPObjectVar.
-  NPObjectVar(PP_Instance instance, NPObject* np_object);
-
-  // Var overrides.
-  virtual NPObjectVar* AsNPObjectVar() OVERRIDE;
-  virtual PP_VarType GetType() const OVERRIDE;
-
-  // Returns the underlying NPObject corresponding to this NPObjectVar.
-  // Guaranteed non-NULL.
-  NPObject* np_object() const { return np_object_; }
-
-  // Notification that the instance was deleted, the internal reference will be
-  // zeroed out.
-  void InstanceDeleted();
-
-  // Possibly 0 if the object has outlived its instance.
-  PP_Instance pp_instance() const { return pp_instance_; }
-
-  // Helper function that converts a PP_Var to an object. This will return NULL
-  // if the PP_Var is not of object type or the object is invalid.
-  CONTENT_EXPORT static scoped_refptr<NPObjectVar> FromPPVar(PP_Var var);
-
- private:
-  virtual ~NPObjectVar();
-
-  // Possibly 0 if the object has outlived its instance.
-  PP_Instance pp_instance_;
-
-  // Guaranteed non-NULL, this is the underlying object used by WebKit. We
-  // hold a reference to this object.
-  NPObject* np_object_;
-
-  DISALLOW_COPY_AND_ASSIGN(NPObjectVar);
-};
-
-}  // ppapi
-
-#endif  // CONTENT_RENDERER_PEPPER_NPOBJECT_VAR_H_