src/content/browser/renderer_host/gamepad_browser_message_filter.cc

   1 // Copyright (c) 2011 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 #include "content/browser/renderer_host/gamepad_browser_message_filter.h"
   6
   7 #include "content/browser/gamepad/gamepad_service.h"
   8 #include "content/common/gamepad_messages.h"
   9
  10 namespace content {
  11
  12 GamepadBrowserMessageFilter::GamepadBrowserMessageFilter()
  13     : is_started_(false) {
  14 }
  15
  16 GamepadBrowserMessageFilter::~GamepadBrowserMessageFilter() {
  17   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  18   if (is_started_)
  19     GamepadService::GetInstance()->RemoveConsumer();
  20 }
  21
  22 bool GamepadBrowserMessageFilter::OnMessageReceived(
  23     const IPC::Message& message,
  24     bool* message_was_ok) {
  25   bool handled = true;
  26   IPC_BEGIN_MESSAGE_MAP_EX(GamepadBrowserMessageFilter,
  27                            message,
  28                            *message_was_ok)
  29     IPC_MESSAGE_HANDLER(GamepadHostMsg_StartPolling, OnGamepadStartPolling)
  30     IPC_MESSAGE_HANDLER(GamepadHostMsg_StopPolling, OnGamepadStopPolling)
  31     IPC_MESSAGE_UNHANDLED(handled = false)
  32   IPC_END_MESSAGE_MAP_EX()
  33   return handled;
  34 }
  35
  36 void GamepadBrowserMessageFilter::OnGamepadStartPolling(
  37     base::SharedMemoryHandle* renderer_handle) {
  38   GamepadService* service = GamepadService::GetInstance();
  39   if (!is_started_) {
  40     is_started_ = true;
  41     service->AddConsumer();
  42     *renderer_handle = service->GetSharedMemoryHandleForProcess(PeerHandle());
  43   } else {
  44     // Currently we only expect the renderer to tell us once to start.
  45     NOTREACHED();
  46   }
  47 }
  48
  49 void GamepadBrowserMessageFilter::OnGamepadStopPolling() {
  50   // TODO(scottmg): Probably get rid of this message. We can't trust it will
  51   // arrive anyway if the renderer crashes, etc.
  52   if (is_started_) {
  53     is_started_ = false;
  54     GamepadService::GetInstance()->RemoveConsumer();
  55   } else {
  56     NOTREACHED();
  57   }
  58 }
  59
  60 }  // namespace content