| OLD | NEW |
|---|
| (Empty) |
| 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 #include "content/browser/gamepad/gamepad_provider.h" | |
| 6 | |
| 7 #include <stddef.h> | |
| 8 #include <string.h> | |
| 9 #include <cmath> | |
| 10 #include <set> | |
| 11 #include <utility> | |
| 12 #include <vector> | |
| 13 | |
| 14 #include "base/bind.h" | |
| 15 #include "base/location.h" | |
| 16 #include "base/logging.h" | |
| 17 #include "base/single_thread_task_runner.h" | |
| 18 #include "base/third_party/dynamic_annotations/dynamic_annotations.h" | |
| 19 #include "base/threading/thread.h" | |
| 20 #include "base/threading/thread_restrictions.h" | |
| 21 #include "base/threading/thread_task_runner_handle.h" | |
| 22 #include "build/build_config.h" | |
| 23 #include "content/browser/gamepad/gamepad_data_fetcher.h" | |
| 24 #include "content/browser/gamepad/gamepad_platform_data_fetcher.h" | |
| 25 #include "content/browser/gamepad/gamepad_service.h" | |
| 26 #include "content/common/gamepad_hardware_buffer.h" | |
| 27 #include "content/common/gamepad_messages.h" | |
| 28 #include "content/common/gamepad_user_gesture.h" | |
| 29 #include "content/public/browser/browser_thread.h" | |
| 30 | |
| 31 using blink::WebGamepad; | |
| 32 using blink::WebGamepads; | |
| 33 | |
| 34 namespace content { | |
| 35 | |
| 36 GamepadProvider::ClosureAndThread::ClosureAndThread( | |
| 37 const base::Closure& c, | |
| 38 const scoped_refptr<base::SingleThreadTaskRunner>& m) | |
| 39 : closure(c), task_runner(m) { | |
| 40 } | |
| 41 | |
| 42 GamepadProvider::ClosureAndThread::ClosureAndThread( | |
| 43 const ClosureAndThread& other) = default; | |
| 44 | |
| 45 GamepadProvider::ClosureAndThread::~ClosureAndThread() { | |
| 46 } | |
| 47 | |
| 48 GamepadProvider::GamepadProvider() | |
| 49 : is_paused_(true), | |
| 50 have_scheduled_do_poll_(false), | |
| 51 devices_changed_(true), | |
| 52 ever_had_user_gesture_(false) { | |
| 53 Initialize(std::unique_ptr<GamepadDataFetcher>()); | |
| 54 } | |
| 55 | |
| 56 GamepadProvider::GamepadProvider(std::unique_ptr<GamepadDataFetcher> fetcher) | |
| 57 : is_paused_(true), | |
| 58 have_scheduled_do_poll_(false), | |
| 59 devices_changed_(true), | |
| 60 ever_had_user_gesture_(false) { | |
| 61 Initialize(std::move(fetcher)); | |
| 62 } | |
| 63 | |
| 64 GamepadProvider::~GamepadProvider() { | |
| 65 base::SystemMonitor* monitor = base::SystemMonitor::Get(); | |
| 66 if (monitor) | |
| 67 monitor->RemoveDevicesChangedObserver(this); | |
| 68 | |
| 69 // Use Stop() to join the polling thread, as there may be pending callbacks | |
| 70 // which dereference |polling_thread_|. | |
| 71 polling_thread_->Stop(); | |
| 72 data_fetcher_.reset(); | |
| 73 } | |
| 74 | |
| 75 base::SharedMemoryHandle GamepadProvider::GetSharedMemoryHandleForProcess( | |
| 76 base::ProcessHandle process) { | |
| 77 base::SharedMemoryHandle renderer_handle; | |
| 78 gamepad_shared_memory_.ShareToProcess(process, &renderer_handle); | |
| 79 return renderer_handle; | |
| 80 } | |
| 81 | |
| 82 void GamepadProvider::GetCurrentGamepadData(WebGamepads* data) { | |
| 83 const WebGamepads& pads = SharedMemoryAsHardwareBuffer()->buffer; | |
| 84 base::AutoLock lock(shared_memory_lock_); | |
| 85 *data = pads; | |
| 86 } | |
| 87 | |
| 88 void GamepadProvider::Pause() { | |
| 89 { | |
| 90 base::AutoLock lock(is_paused_lock_); | |
| 91 is_paused_ = true; | |
| 92 } | |
| 93 base::MessageLoop* polling_loop = polling_thread_->message_loop(); | |
| 94 polling_loop->task_runner()->PostTask( | |
| 95 FROM_HERE, | |
| 96 base::Bind(&GamepadProvider::SendPauseHint, Unretained(this), true)); | |
| 97 } | |
| 98 | |
| 99 void GamepadProvider::Resume() { | |
| 100 { | |
| 101 base::AutoLock lock(is_paused_lock_); | |
| 102 if (!is_paused_) | |
| 103 return; | |
| 104 is_paused_ = false; | |
| 105 } | |
| 106 | |
| 107 base::MessageLoop* polling_loop = polling_thread_->message_loop(); | |
| 108 polling_loop->task_runner()->PostTask( | |
| 109 FROM_HERE, | |
| 110 base::Bind(&GamepadProvider::SendPauseHint, Unretained(this), false)); | |
| 111 polling_loop->task_runner()->PostTask( | |
| 112 FROM_HERE, | |
| 113 base::Bind(&GamepadProvider::ScheduleDoPoll, Unretained(this))); | |
| 114 } | |
| 115 | |
| 116 void GamepadProvider::RegisterForUserGesture(const base::Closure& closure) { | |
| 117 base::AutoLock lock(user_gesture_lock_); | |
| 118 user_gesture_observers_.push_back( | |
| 119 ClosureAndThread(closure, base::ThreadTaskRunnerHandle::Get())); | |
| 120 } | |
| 121 | |
| 122 void GamepadProvider::OnDevicesChanged(base::SystemMonitor::DeviceType type) { | |
| 123 base::AutoLock lock(devices_changed_lock_); | |
| 124 devices_changed_ = true; | |
| 125 } | |
| 126 | |
| 127 void GamepadProvider::Initialize(std::unique_ptr<GamepadDataFetcher> fetcher) { | |
| 128 size_t data_size = sizeof(GamepadHardwareBuffer); | |
| 129 base::SystemMonitor* monitor = base::SystemMonitor::Get(); | |
| 130 if (monitor) | |
| 131 monitor->AddDevicesChangedObserver(this); | |
| 132 bool res = gamepad_shared_memory_.CreateAndMapAnonymous(data_size); | |
| 133 CHECK(res); | |
| 134 GamepadHardwareBuffer* hwbuf = SharedMemoryAsHardwareBuffer(); | |
| 135 memset(hwbuf, 0, sizeof(GamepadHardwareBuffer)); | |
| 136 pad_states_.reset(new PadState[WebGamepads::itemsLengthCap]); | |
| 137 | |
| 138 polling_thread_.reset(new base::Thread("Gamepad polling thread")); | |
| 139 #if defined(OS_LINUX) | |
| 140 // On Linux, the data fetcher needs to watch file descriptors, so the message | |
| 141 // loop needs to be a libevent loop. | |
| 142 const base::MessageLoop::Type kMessageLoopType = base::MessageLoop::TYPE_IO; | |
| 143 #elif defined(OS_ANDROID) | |
| 144 // On Android, keeping a message loop of default type. | |
| 145 const base::MessageLoop::Type kMessageLoopType = | |
| 146 base::MessageLoop::TYPE_DEFAULT; | |
| 147 #else | |
| 148 // On Mac, the data fetcher uses IOKit which depends on CFRunLoop, so the | |
| 149 // message loop needs to be a UI-type loop. On Windows it must be a UI loop | |
| 150 // to properly pump the MessageWindow that captures device state. | |
| 151 const base::MessageLoop::Type kMessageLoopType = base::MessageLoop::TYPE_UI; | |
| 152 #endif | |
| 153 polling_thread_->StartWithOptions(base::Thread::Options(kMessageLoopType, 0)); | |
| 154 | |
| 155 polling_thread_->task_runner()->PostTask( | |
| 156 FROM_HERE, base::Bind(&GamepadProvider::DoInitializePollingThread, | |
| 157 base::Unretained(this), base::Passed(&fetcher))); | |
| 158 } | |
| 159 | |
| 160 void GamepadProvider::DoInitializePollingThread( | |
| 161 std::unique_ptr<GamepadDataFetcher> fetcher) { | |
| 162 DCHECK(base::MessageLoop::current() == polling_thread_->message_loop()); | |
| 163 DCHECK(!data_fetcher_.get()); // Should only initialize once. | |
| 164 | |
| 165 if (!fetcher) | |
| 166 fetcher.reset(new GamepadPlatformDataFetcher); | |
| 167 data_fetcher_ = std::move(fetcher); | |
| 168 } | |
| 169 | |
| 170 void GamepadProvider::SendPauseHint(bool paused) { | |
| 171 DCHECK(base::MessageLoop::current() == polling_thread_->message_loop()); | |
| 172 if (data_fetcher_) | |
| 173 data_fetcher_->PauseHint(paused); | |
| 174 } | |
| 175 | |
| 176 bool GamepadProvider::PadState::Match(const WebGamepad& pad) const { | |
| 177 return connected_ == pad.connected && | |
| 178 axes_length_ == pad.axesLength && | |
| 179 buttons_length_ == pad.buttonsLength && | |
| 180 memcmp(id_, pad.id, sizeof(id_)) == 0 && | |
| 181 memcmp(mapping_, pad.mapping, sizeof(mapping_)) == 0; | |
| 182 } | |
| 183 | |
| 184 void GamepadProvider::PadState::SetPad(const WebGamepad& pad) { | |
| 185 connected_ = pad.connected; | |
| 186 axes_length_ = pad.axesLength; | |
| 187 buttons_length_ = pad.buttonsLength; | |
| 188 memcpy(id_, pad.id, sizeof(id_)); | |
| 189 memcpy(mapping_, pad.mapping, sizeof(mapping_)); | |
| 190 } | |
| 191 | |
| 192 void GamepadProvider::PadState::SetDisconnected() { | |
| 193 connected_ = false; | |
| 194 axes_length_ = 0; | |
| 195 buttons_length_ = 0; | |
| 196 memset(id_, 0, sizeof(id_)); | |
| 197 memset(mapping_, 0, sizeof(mapping_)); | |
| 198 } | |
| 199 | |
| 200 void GamepadProvider::PadState::AsWebGamepad(WebGamepad* pad) { | |
| 201 pad->connected = connected_; | |
| 202 pad->axesLength = axes_length_; | |
| 203 pad->buttonsLength = buttons_length_; | |
| 204 memcpy(pad->id, id_, sizeof(id_)); | |
| 205 memcpy(pad->mapping, mapping_, sizeof(mapping_)); | |
| 206 memset(pad->axes, 0, sizeof(pad->axes)); | |
| 207 memset(pad->buttons, 0, sizeof(pad->buttons)); | |
| 208 } | |
| 209 | |
| 210 void GamepadProvider::DoPoll() { | |
| 211 DCHECK(base::MessageLoop::current() == polling_thread_->message_loop()); | |
| 212 DCHECK(have_scheduled_do_poll_); | |
| 213 have_scheduled_do_poll_ = false; | |
| 214 | |
| 215 bool changed; | |
| 216 GamepadHardwareBuffer* hwbuf = SharedMemoryAsHardwareBuffer(); | |
| 217 | |
| 218 ANNOTATE_BENIGN_RACE_SIZED( | |
| 219 &hwbuf->buffer, | |
| 220 sizeof(WebGamepads), | |
| 221 "Racey reads are discarded"); | |
| 222 | |
| 223 { | |
| 224 base::AutoLock lock(devices_changed_lock_); | |
| 225 changed = devices_changed_; | |
| 226 devices_changed_ = false; | |
| 227 } | |
| 228 | |
| 229 { | |
| 230 base::AutoLock lock(shared_memory_lock_); | |
| 231 | |
| 232 // Acquire the SeqLock. There is only ever one writer to this data. | |
| 233 // See gamepad_hardware_buffer.h. | |
| 234 hwbuf->sequence.WriteBegin(); | |
| 235 data_fetcher_->GetGamepadData(&hwbuf->buffer, changed); | |
| 236 hwbuf->sequence.WriteEnd(); | |
| 237 } | |
| 238 | |
| 239 if (ever_had_user_gesture_) { | |
| 240 for (unsigned i = 0; i < WebGamepads::itemsLengthCap; ++i) { | |
| 241 WebGamepad& pad = hwbuf->buffer.items[i]; | |
| 242 PadState& state = pad_states_.get()[i]; | |
| 243 if (pad.connected && !state.connected()) { | |
| 244 OnGamepadConnectionChange(true, i, pad); | |
| 245 } else if (!pad.connected && state.connected()) { | |
| 246 OnGamepadConnectionChange(false, i, pad); | |
| 247 } else if (pad.connected && state.connected() && !state.Match(pad)) { | |
| 248 WebGamepad old_pad; | |
| 249 state.AsWebGamepad(&old_pad); | |
| 250 OnGamepadConnectionChange(false, i, old_pad); | |
| 251 OnGamepadConnectionChange(true, i, pad); | |
| 252 } | |
| 253 } | |
| 254 } | |
| 255 | |
| 256 CheckForUserGesture(); | |
| 257 | |
| 258 // Schedule our next interval of polling. | |
| 259 ScheduleDoPoll(); | |
| 260 } | |
| 261 | |
| 262 void GamepadProvider::ScheduleDoPoll() { | |
| 263 DCHECK(base::MessageLoop::current() == polling_thread_->message_loop()); | |
| 264 if (have_scheduled_do_poll_) | |
| 265 return; | |
| 266 | |
| 267 { | |
| 268 base::AutoLock lock(is_paused_lock_); | |
| 269 if (is_paused_) | |
| 270 return; | |
| 271 } | |
| 272 | |
| 273 base::ThreadTaskRunnerHandle::Get()->PostDelayedTask( | |
| 274 FROM_HERE, base::Bind(&GamepadProvider::DoPoll, Unretained(this)), | |
| 275 base::TimeDelta::FromMilliseconds(kDesiredSamplingIntervalMs)); | |
| 276 have_scheduled_do_poll_ = true; | |
| 277 } | |
| 278 | |
| 279 void GamepadProvider::OnGamepadConnectionChange( | |
| 280 bool connected, int index, const WebGamepad& pad) { | |
| 281 PadState& state = pad_states_.get()[index]; | |
| 282 if (connected) | |
| 283 state.SetPad(pad); | |
| 284 else | |
| 285 state.SetDisconnected(); | |
| 286 | |
| 287 BrowserThread::PostTask( | |
| 288 BrowserThread::IO, | |
| 289 FROM_HERE, | |
| 290 base::Bind(&GamepadProvider::DispatchGamepadConnectionChange, | |
| 291 base::Unretained(this), | |
| 292 connected, | |
| 293 index, | |
| 294 pad)); | |
| 295 } | |
| 296 | |
| 297 void GamepadProvider::DispatchGamepadConnectionChange( | |
| 298 bool connected, int index, const WebGamepad& pad) { | |
| 299 if (connected) | |
| 300 GamepadService::GetInstance()->OnGamepadConnected(index, pad); | |
| 301 else | |
| 302 GamepadService::GetInstance()->OnGamepadDisconnected(index, pad); | |
| 303 } | |
| 304 | |
| 305 GamepadHardwareBuffer* GamepadProvider::SharedMemoryAsHardwareBuffer() { | |
| 306 void* mem = gamepad_shared_memory_.memory(); | |
| 307 CHECK(mem); | |
| 308 return static_cast<GamepadHardwareBuffer*>(mem); | |
| 309 } | |
| 310 | |
| 311 void GamepadProvider::CheckForUserGesture() { | |
| 312 base::AutoLock lock(user_gesture_lock_); | |
| 313 if (user_gesture_observers_.empty() && ever_had_user_gesture_) | |
| 314 return; | |
| 315 | |
| 316 bool had_gesture_before = ever_had_user_gesture_; | |
| 317 const WebGamepads& pads = SharedMemoryAsHardwareBuffer()->buffer; | |
| 318 if (GamepadsHaveUserGesture(pads)) { | |
| 319 ever_had_user_gesture_ = true; | |
| 320 for (size_t i = 0; i < user_gesture_observers_.size(); i++) { | |
| 321 user_gesture_observers_[i].task_runner->PostTask( | |
| 322 FROM_HERE, user_gesture_observers_[i].closure); | |
| 323 } | |
| 324 user_gesture_observers_.clear(); | |
| 325 } | |
| 326 if (!had_gesture_before && ever_had_user_gesture_) { | |
| 327 // Initialize pad_states_ for the first time. | |
| 328 for (size_t i = 0; i < WebGamepads::itemsLengthCap; ++i) { | |
| 329 pad_states_.get()[i].SetPad(pads.items[i]); | |
| 330 } | |
| 331 } | |
| 332 } | |
| 333 | |
| 334 } // namespace content | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2081583002:
Migrating majority of gamepad from content/browser/ to device/ (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master