// Copyright (c) 2010 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 PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_ #define PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_ #include <map> #include "base/linked_ptr.h" #include "ppapi/c/pp_completion_callback.h" #include "ppapi/c/pp_stdint.h" #include "ppapi/c/pp_resource.h" #include "ppapi/c/pp_var.h" namespace pp { namespace proxy { class PluginDispatcher; class PluginResource; class PluginResourceTracker { public: PluginResourceTracker(PluginDispatcher* dispatcher); ~PluginResourceTracker(); // Returns the object associated with the given resource ID, or NULL if // there isn't one. PluginResource* GetResourceObject(PP_Resource pp_resource); void AddResource(PP_Resource pp_resource, linked_ptr<PluginResource> object); void AddRefResource(PP_Resource resource); void ReleaseResource(PP_Resource resource); // Checks if the resource just returned from the renderer is already // tracked by the plugin side and adjusts the refcounts if so. // // When the browser returns a PP_Resource, it could be a new one, in which // case the proxy wants to create a corresponding object and call // AddResource() on it. However, if the resouce is already known, then the // refcount needs to be adjusted in both the plugin and the renderer side // and no such object needs to be created. // // Returns true if the resource was previously known. The refcount will be // fixed up such that it's ready to use by the plugin. A proxy can then // just return the resource without doing any more work. // // Typical usage: // // PP_Resource result; // dispatcher->Send(new MyMessage(..., &result)); // if (dispatcher->plugin_resource_tracker()-> // PreparePreviouslyTrackedResource(result)) // return result; // ... create resource object ... // dispatcher->plugin_resource_tracker()->AddResource(result, object); // return result; bool PreparePreviouslyTrackedResource(PP_Resource resource); private: struct ResourceInfo { ResourceInfo(); ResourceInfo(int ref_count, linked_ptr<PluginResource> r); ResourceInfo(const ResourceInfo& other); ~ResourceInfo(); ResourceInfo& operator=(const ResourceInfo& other); int ref_count; linked_ptr<PluginResource> resource; // May be NULL. }; void ReleasePluginResourceRef(const PP_Resource& var, bool notify_browser_on_release); // Pointer to the dispatcher that owns us. PluginDispatcher* dispatcher_; typedef std::map<PP_Resource, ResourceInfo> ResourceMap; ResourceMap resource_map_; }; } // namespace proxy } // namespace pp #endif // PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_