ppapi/proxy/gamepad_resource.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef PPAPI_PROXY_GAMEPAD_RESOURCE_H_
   6 #define PPAPI_PROXY_GAMEPAD_RESOURCE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/shared_memory.h"
  12 #include "ppapi/c/ppb_gamepad.h"
  13 #include "ppapi/proxy/plugin_resource.h"
  14 #include "ppapi/proxy/ppapi_proxy_export.h"
  15 #include "ppapi/shared_impl/ppb_gamepad_shared.h"
  16 #include "ppapi/thunk/ppb_gamepad_api.h"
  17
  18 struct PP_GamepadsSampleData;
  19
  20 namespace base {
  21 class SharedMemory;
  22 }
  23
  24 namespace ppapi {
  25 namespace proxy {
  26
  27 // This class is a bit weird. It isn't a true resource from the plugin's
  28 // perspective. But we need to make requests to the browser and get replies.
  29 // It's more convenient to do this as a resource, so the instance just
  30 // maintains an internal lazily instantiated copy of this resource.
  31 class PPAPI_PROXY_EXPORT GamepadResource
  32       : public PluginResource,
  33         public thunk::PPB_Gamepad_API {
  34  public:
  35   GamepadResource(Connection connection, PP_Instance instance);
  36   virtual ~GamepadResource();
  37
  38   // Resource implementation.
  39   virtual thunk::PPB_Gamepad_API* AsPPB_Gamepad_API() override;
  40
  41   // PPB_Gamepad_API.
  42   virtual void Sample(PP_Instance instance,
  43                       PP_GamepadsSampleData* data) override;
  44
  45  private:
  46   void OnPluginMsgSendMemory(const ResourceMessageReplyParams& params);
  47
  48   scoped_ptr<base::SharedMemory> shared_memory_;
  49   const ContentGamepadHardwareBuffer* buffer_;
  50
  51   // Last data returned so we can use this in the event of a read failure.
  52   PP_GamepadsSampleData last_read_;
  53
  54   DISALLOW_COPY_AND_ASSIGN(GamepadResource);
  55 };
  56
  57 }  // namespace proxy
  58 }  // namespace ppapi
  59
  60 #endif  // PPAPI_PROXY_GAMEPAD_RESOURCE_H_