| // 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 PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_ |
| #define PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_ |
| |
| #include <map> |
| #include <unordered_set> |
| #include <utility> |
| |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "ppapi/c/pp_completion_callback.h" |
| #include "ppapi/c/pp_instance.h" |
| #include "ppapi/c/pp_resource.h" |
| #include "ppapi/c/pp_stdint.h" |
| #include "ppapi/c/pp_var.h" |
| #include "ppapi/proxy/ppapi_proxy_export.h" |
| #include "ppapi/shared_impl/host_resource.h" |
| #include "ppapi/shared_impl/resource_tracker.h" |
| |
| namespace base { |
| template<typename T> struct DefaultSingletonTraits; |
| } |
| |
| namespace ppapi { |
| |
| namespace proxy { |
| |
| class PPAPI_PROXY_EXPORT PluginResourceTracker : public ResourceTracker { |
| public: |
| PluginResourceTracker(); |
| ~PluginResourceTracker() override; |
| |
| // Given a host resource, maps it to an existing plugin resource ID if it |
| // exists, or returns 0 on failure. |
| PP_Resource PluginResourceForHostResource( |
| const HostResource& resource) const; |
| |
| // "Abandons" a PP_Resource on the plugin side. This releases a reference to |
| // the resource and allows the plugin side of the resource (the proxy |
| // resource) to be destroyed without sending a message to the renderer |
| // notifing it that the plugin has released the resource. This is useful when |
| // the plugin sends a resource to the renderer in reply to a sync IPC. The |
| // plugin would want to release its reference to the reply resource straight |
| // away but doing so can sometimes cause the resource to be deleted in the |
| // renderer before the sync IPC reply has been received giving the renderer a |
| // chance to add a ref to it. (see e.g. crbug.com/490611). Instead the |
| // renderer assumes responsibility for the ref that the plugin created and |
| // this function can be called. |
| void AbandonResource(PP_Resource res); |
| |
| protected: |
| // ResourceTracker overrides. |
| PP_Resource AddResource(Resource* object) override; |
| void RemoveResource(Resource* object) override; |
| |
| private: |
| // Map of host instance/resource pairs to a plugin resource ID. |
| typedef std::map<HostResource, PP_Resource> HostResourceMap; |
| HostResourceMap host_resource_map_; |
| |
| std::unordered_set<PP_Resource> abandoned_resources_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PluginResourceTracker); |
| }; |
| |
| } // namespace proxy |
| } // namespace ppapi |
| |
| #endif // PPAPI_PROXY_PLUGIN_RESOURCE_TRACKER_H_ |