1 // 2 // Copyright 2010 The Android Open Source Project 3 // 4 // Provides a shared memory transport for input events. 5 // 6 #define LOG_TAG "InputTransport" 7 8 //#define LOG_NDEBUG 0 9 10 // Log debug messages about channel messages (send message, receive message) 11 #define DEBUG_CHANNEL_MESSAGES 0 12 13 // Log debug messages whenever InputChannel objects are created/destroyed 14 #define DEBUG_CHANNEL_LIFECYCLE 0 15 16 // Log debug messages about transport actions 17 #define DEBUG_TRANSPORT_ACTIONS 0 18 19 // Log debug messages about touch event resampling 20 #define DEBUG_RESAMPLING 0 21 22 23 #include <cutils/log.h> 24 #include <cutils/properties.h> 25 #include <errno.h> 26 #include <fcntl.h> 27 #include <androidfw/InputTransport.h> 28 #include <unistd.h> 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <math.h> 32 33 34 namespace android { 35 36 // Socket buffer size. The default is typically about 128KB, which is much larger than 37 // we really need. So we make it smaller. It just needs to be big enough to hold 38 // a few dozen large multi-finger motion events in the case where an application gets 39 // behind processing touches. 40 static const size_t SOCKET_BUFFER_SIZE = 32 * 1024; 41 42 // Nanoseconds per milliseconds. 43 static const nsecs_t NANOS_PER_MS = 1000000; 44 45 // Latency added during resampling. A few milliseconds doesn't hurt much but 46 // reduces the impact of mispredicted touch positions. 47 static const nsecs_t RESAMPLE_LATENCY = 5 * NANOS_PER_MS; 48 49 // Minimum time difference between consecutive samples before attempting to resample. 50 static const nsecs_t RESAMPLE_MIN_DELTA = 2 * NANOS_PER_MS; 51 52 // Maximum time to predict forward from the last known state, to avoid predicting too 53 // far into the future. This time is further bounded by 50% of the last time delta. 54 static const nsecs_t RESAMPLE_MAX_PREDICTION = 8 * NANOS_PER_MS; 55 56 template<typename T> 57 inline static T min(const T& a, const T& b) { 58 return a < b ? a : b; 59 } 60 61 inline static float lerp(float a, float b, float alpha) { 62 return a + alpha * (b - a); 63 } 64 65 // --- InputMessage --- 66 67 bool InputMessage::isValid(size_t actualSize) const { 68 if (size() == actualSize) { 69 switch (header.type) { 70 case TYPE_KEY: 71 return true; 72 case TYPE_MOTION: 73 return body.motion.pointerCount > 0 74 && body.motion.pointerCount <= MAX_POINTERS; 75 case TYPE_FINISHED: 76 return true; 77 } 78 } 79 return false; 80 } 81 82 size_t InputMessage::size() const { 83 switch (header.type) { 84 case TYPE_KEY: 85 return sizeof(Header) + body.key.size(); 86 case TYPE_MOTION: 87 return sizeof(Header) + body.motion.size(); 88 case TYPE_FINISHED: 89 return sizeof(Header) + body.finished.size(); 90 } 91 return sizeof(Header); 92 } 93 94 95 // --- InputChannel --- 96 97 InputChannel::InputChannel(const String8& name, int fd) : 98 mName(name), mFd(fd) { 99 #if DEBUG_CHANNEL_LIFECYCLE 100 ALOGD("Input channel constructed: name='%s', fd=%d", 101 mName.string(), fd); 102 #endif 103 104 int result = fcntl(mFd, F_SETFL, O_NONBLOCK); 105 LOG_ALWAYS_FATAL_IF(result != 0, "channel '%s' ~ Could not make socket " 106 "non-blocking. errno=%d", mName.string(), errno); 107 } 108 109 InputChannel::~InputChannel() { 110 #if DEBUG_CHANNEL_LIFECYCLE 111 ALOGD("Input channel destroyed: name='%s', fd=%d", 112 mName.string(), mFd); 113 #endif 114 115 ::close(mFd); 116 } 117 118 status_t InputChannel::openInputChannelPair(const String8& name, 119 sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel) { 120 int sockets[2]; 121 if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets)) { 122 status_t result = -errno; 123 ALOGE("channel '%s' ~ Could not create socket pair. errno=%d", 124 name.string(), errno); 125 outServerChannel.clear(); 126 outClientChannel.clear(); 127 return result; 128 } 129 130 int bufferSize = SOCKET_BUFFER_SIZE; 131 setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); 132 setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); 133 setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); 134 setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); 135 136 String8 serverChannelName = name; 137 serverChannelName.append(" (server)"); 138 outServerChannel = new InputChannel(serverChannelName, sockets[0]); 139 140 String8 clientChannelName = name; 141 clientChannelName.append(" (client)"); 142 outClientChannel = new InputChannel(clientChannelName, sockets[1]); 143 return OK; 144 } 145 146 status_t InputChannel::sendMessage(const InputMessage* msg) { 147 size_t msgLength = msg->size(); 148 ssize_t nWrite; 149 do { 150 nWrite = ::send(mFd, msg, msgLength, MSG_DONTWAIT | MSG_NOSIGNAL); 151 } while (nWrite == -1 && errno == EINTR); 152 153 if (nWrite < 0) { 154 int error = errno; 155 #if DEBUG_CHANNEL_MESSAGES 156 ALOGD("channel '%s' ~ error sending message of type %d, errno=%d", mName.string(), 157 msg->header.type, error); 158 #endif 159 if (error == EAGAIN || error == EWOULDBLOCK) { 160 return WOULD_BLOCK; 161 } 162 if (error == EPIPE || error == ENOTCONN) { 163 return DEAD_OBJECT; 164 } 165 return -error; 166 } 167 168 if (size_t(nWrite) != msgLength) { 169 #if DEBUG_CHANNEL_MESSAGES 170 ALOGD("channel '%s' ~ error sending message type %d, send was incomplete", 171 mName.string(), msg->header.type); 172 #endif 173 return DEAD_OBJECT; 174 } 175 176 #if DEBUG_CHANNEL_MESSAGES 177 ALOGD("channel '%s' ~ sent message of type %d", mName.string(), msg->header.type); 178 #endif 179 return OK; 180 } 181 182 status_t InputChannel::receiveMessage(InputMessage* msg) { 183 ssize_t nRead; 184 do { 185 nRead = ::recv(mFd, msg, sizeof(InputMessage), MSG_DONTWAIT); 186 } while (nRead == -1 && errno == EINTR); 187 188 if (nRead < 0) { 189 int error = errno; 190 #if DEBUG_CHANNEL_MESSAGES 191 ALOGD("channel '%s' ~ receive message failed, errno=%d", mName.string(), errno); 192 #endif 193 if (error == EAGAIN || error == EWOULDBLOCK) { 194 return WOULD_BLOCK; 195 } 196 if (error == EPIPE || error == ENOTCONN) { 197 return DEAD_OBJECT; 198 } 199 return -error; 200 } 201 202 if (nRead == 0) { // check for EOF 203 #if DEBUG_CHANNEL_MESSAGES 204 ALOGD("channel '%s' ~ receive message failed because peer was closed", mName.string()); 205 #endif 206 return DEAD_OBJECT; 207 } 208 209 if (!msg->isValid(nRead)) { 210 #if DEBUG_CHANNEL_MESSAGES 211 ALOGD("channel '%s' ~ received invalid message", mName.string()); 212 #endif 213 return BAD_VALUE; 214 } 215 216 #if DEBUG_CHANNEL_MESSAGES 217 ALOGD("channel '%s' ~ received message of type %d", mName.string(), msg->header.type); 218 #endif 219 return OK; 220 } 221 222 223 // --- InputPublisher --- 224 225 InputPublisher::InputPublisher(const sp<InputChannel>& channel) : 226 mChannel(channel) { 227 } 228 229 InputPublisher::~InputPublisher() { 230 } 231 232 status_t InputPublisher::publishKeyEvent( 233 uint32_t seq, 234 int32_t deviceId, 235 int32_t source, 236 int32_t action, 237 int32_t flags, 238 int32_t keyCode, 239 int32_t scanCode, 240 int32_t metaState, 241 int32_t repeatCount, 242 nsecs_t downTime, 243 nsecs_t eventTime) { 244 #if DEBUG_TRANSPORT_ACTIONS 245 ALOGD("channel '%s' publisher ~ publishKeyEvent: seq=%u, deviceId=%d, source=0x%x, " 246 "action=0x%x, flags=0x%x, keyCode=%d, scanCode=%d, metaState=0x%x, repeatCount=%d," 247 "downTime=%lld, eventTime=%lld", 248 mChannel->getName().string(), seq, 249 deviceId, source, action, flags, keyCode, scanCode, metaState, repeatCount, 250 downTime, eventTime); 251 #endif 252 253 if (!seq) { 254 ALOGE("Attempted to publish a key event with sequence number 0."); 255 return BAD_VALUE; 256 } 257 258 InputMessage msg; 259 msg.header.type = InputMessage::TYPE_KEY; 260 msg.body.key.seq = seq; 261 msg.body.key.deviceId = deviceId; 262 msg.body.key.source = source; 263 msg.body.key.action = action; 264 msg.body.key.flags = flags; 265 msg.body.key.keyCode = keyCode; 266 msg.body.key.scanCode = scanCode; 267 msg.body.key.metaState = metaState; 268 msg.body.key.repeatCount = repeatCount; 269 msg.body.key.downTime = downTime; 270 msg.body.key.eventTime = eventTime; 271 return mChannel->sendMessage(&msg); 272 } 273 274 status_t InputPublisher::publishMotionEvent( 275 uint32_t seq, 276 int32_t deviceId, 277 int32_t source, 278 int32_t action, 279 int32_t flags, 280 int32_t edgeFlags, 281 int32_t metaState, 282 int32_t buttonState, 283 float xOffset, 284 float yOffset, 285 float xPrecision, 286 float yPrecision, 287 nsecs_t downTime, 288 nsecs_t eventTime, 289 size_t pointerCount, 290 const PointerProperties* pointerProperties, 291 const PointerCoords* pointerCoords) { 292 #if DEBUG_TRANSPORT_ACTIONS 293 ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, " 294 "action=0x%x, flags=0x%x, edgeFlags=0x%x, metaState=0x%x, buttonState=0x%x, " 295 "xOffset=%f, yOffset=%f, " 296 "xPrecision=%f, yPrecision=%f, downTime=%lld, eventTime=%lld, " 297 "pointerCount=%d", 298 mChannel->getName().string(), seq, 299 deviceId, source, action, flags, edgeFlags, metaState, buttonState, 300 xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount); 301 #endif 302 303 if (!seq) { 304 ALOGE("Attempted to publish a motion event with sequence number 0."); 305 return BAD_VALUE; 306 } 307 308 if (pointerCount > MAX_POINTERS || pointerCount < 1) { 309 ALOGE("channel '%s' publisher ~ Invalid number of pointers provided: %d.", 310 mChannel->getName().string(), pointerCount); 311 return BAD_VALUE; 312 } 313 314 InputMessage msg; 315 msg.header.type = InputMessage::TYPE_MOTION; 316 msg.body.motion.seq = seq; 317 msg.body.motion.deviceId = deviceId; 318 msg.body.motion.source = source; 319 msg.body.motion.action = action; 320 msg.body.motion.flags = flags; 321 msg.body.motion.edgeFlags = edgeFlags; 322 msg.body.motion.metaState = metaState; 323 msg.body.motion.buttonState = buttonState; 324 msg.body.motion.xOffset = xOffset; 325 msg.body.motion.yOffset = yOffset; 326 msg.body.motion.xPrecision = xPrecision; 327 msg.body.motion.yPrecision = yPrecision; 328 msg.body.motion.downTime = downTime; 329 msg.body.motion.eventTime = eventTime; 330 msg.body.motion.pointerCount = pointerCount; 331 for (size_t i = 0; i < pointerCount; i++) { 332 msg.body.motion.pointers[i].properties.copyFrom(pointerProperties[i]); 333 msg.body.motion.pointers[i].coords.copyFrom(pointerCoords[i]); 334 } 335 return mChannel->sendMessage(&msg); 336 } 337 338 status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) { 339 #if DEBUG_TRANSPORT_ACTIONS 340 ALOGD("channel '%s' publisher ~ receiveFinishedSignal", 341 mChannel->getName().string()); 342 #endif 343 344 InputMessage msg; 345 status_t result = mChannel->receiveMessage(&msg); 346 if (result) { 347 *outSeq = 0; 348 *outHandled = false; 349 return result; 350 } 351 if (msg.header.type != InputMessage::TYPE_FINISHED) { 352 ALOGE("channel '%s' publisher ~ Received unexpected message of type %d from consumer", 353 mChannel->getName().string(), msg.header.type); 354 return UNKNOWN_ERROR; 355 } 356 *outSeq = msg.body.finished.seq; 357 *outHandled = msg.body.finished.handled; 358 return OK; 359 } 360 361 // --- InputConsumer --- 362 363 InputConsumer::InputConsumer(const sp<InputChannel>& channel) : 364 mResampleTouch(isTouchResamplingEnabled()), 365 mChannel(channel), mMsgDeferred(false) { 366 } 367 368 InputConsumer::~InputConsumer() { 369 } 370 371 bool InputConsumer::isTouchResamplingEnabled() { 372 char value[PROPERTY_VALUE_MAX]; 373 int length = property_get("debug.inputconsumer.resample", value, NULL); 374 if (length > 0) { 375 if (!strcmp("0", value)) { 376 return false; 377 } 378 if (strcmp("1", value)) { 379 ALOGD("Unrecognized property value for 'debug.inputconsumer.resample'. " 380 "Use '1' or '0'."); 381 } 382 } 383 return true; 384 } 385 386 status_t InputConsumer::consume(InputEventFactoryInterface* factory, 387 bool consumeBatches, nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { 388 #if DEBUG_TRANSPORT_ACTIONS 389 ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%lld", 390 mChannel->getName().string(), consumeBatches ? "true" : "false", frameTime); 391 #endif 392 393 *outSeq = 0; 394 *outEvent = NULL; 395 396 // Fetch the next input message. 397 // Loop until an event can be returned or no additional events are received. 398 while (!*outEvent) { 399 if (mMsgDeferred) { 400 // mMsg contains a valid input message from the previous call to consume 401 // that has not yet been processed. 402 mMsgDeferred = false; 403 } else { 404 // Receive a fresh message. 405 status_t result = mChannel->receiveMessage(&mMsg); 406 if (result) { 407 // Consume the next batched event unless batches are being held for later. 408 if (consumeBatches || result != WOULD_BLOCK) { 409 result = consumeBatch(factory, frameTime, outSeq, outEvent); 410 if (*outEvent) { 411 #if DEBUG_TRANSPORT_ACTIONS 412 ALOGD("channel '%s' consumer ~ consumed batch event, seq=%u", 413 mChannel->getName().string(), *outSeq); 414 #endif 415 break; 416 } 417 } 418 return result; 419 } 420 } 421 422 switch (mMsg.header.type) { 423 case InputMessage::TYPE_KEY: { 424 KeyEvent* keyEvent = factory->createKeyEvent(); 425 if (!keyEvent) return NO_MEMORY; 426 427 initializeKeyEvent(keyEvent, &mMsg); 428 *outSeq = mMsg.body.key.seq; 429 *outEvent = keyEvent; 430 #if DEBUG_TRANSPORT_ACTIONS 431 ALOGD("channel '%s' consumer ~ consumed key event, seq=%u", 432 mChannel->getName().string(), *outSeq); 433 #endif 434 break; 435 } 436 437 case AINPUT_EVENT_TYPE_MOTION: { 438 ssize_t batchIndex = findBatch(mMsg.body.motion.deviceId, mMsg.body.motion.source); 439 if (batchIndex >= 0) { 440 Batch& batch = mBatches.editItemAt(batchIndex); 441 if (canAddSample(batch, &mMsg)) { 442 batch.samples.push(mMsg); 443 #if DEBUG_TRANSPORT_ACTIONS 444 ALOGD("channel '%s' consumer ~ appended to batch event", 445 mChannel->getName().string()); 446 #endif 447 break; 448 } else { 449 // We cannot append to the batch in progress, so we need to consume 450 // the previous batch right now and defer the new message until later. 451 mMsgDeferred = true; 452 status_t result = consumeSamples(factory, 453 batch, batch.samples.size(), outSeq, outEvent); 454 mBatches.removeAt(batchIndex); 455 if (result) { 456 return result; 457 } 458 #if DEBUG_TRANSPORT_ACTIONS 459 ALOGD("channel '%s' consumer ~ consumed batch event and " 460 "deferred current event, seq=%u", 461 mChannel->getName().string(), *outSeq); 462 #endif 463 break; 464 } 465 } 466 467 // Start a new batch if needed. 468 if (mMsg.body.motion.action == AMOTION_EVENT_ACTION_MOVE 469 || mMsg.body.motion.action == AMOTION_EVENT_ACTION_HOVER_MOVE) { 470 mBatches.push(); 471 Batch& batch = mBatches.editTop(); 472 batch.samples.push(mMsg); 473 #if DEBUG_TRANSPORT_ACTIONS 474 ALOGD("channel '%s' consumer ~ started batch event", 475 mChannel->getName().string()); 476 #endif 477 break; 478 } 479 480 MotionEvent* motionEvent = factory->createMotionEvent(); 481 if (! motionEvent) return NO_MEMORY; 482 483 updateTouchState(&mMsg); 484 initializeMotionEvent(motionEvent, &mMsg); 485 *outSeq = mMsg.body.motion.seq; 486 *outEvent = motionEvent; 487 #if DEBUG_TRANSPORT_ACTIONS 488 ALOGD("channel '%s' consumer ~ consumed motion event, seq=%u", 489 mChannel->getName().string(), *outSeq); 490 #endif 491 break; 492 } 493 494 default: 495 ALOGE("channel '%s' consumer ~ Received unexpected message of type %d", 496 mChannel->getName().string(), mMsg.header.type); 497 return UNKNOWN_ERROR; 498 } 499 } 500 return OK; 501 } 502 503 status_t InputConsumer::consumeBatch(InputEventFactoryInterface* factory, 504 nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { 505 status_t result; 506 for (size_t i = mBatches.size(); i-- > 0; ) { 507 Batch& batch = mBatches.editItemAt(i); 508 if (frameTime < 0) { 509 result = consumeSamples(factory, batch, batch.samples.size(), 510 outSeq, outEvent); 511 mBatches.removeAt(i); 512 return result; 513 } 514 515 nsecs_t sampleTime = frameTime - RESAMPLE_LATENCY; 516 ssize_t split = findSampleNoLaterThan(batch, sampleTime); 517 if (split < 0) { 518 continue; 519 } 520 521 result = consumeSamples(factory, batch, split + 1, outSeq, outEvent); 522 const InputMessage* next; 523 if (batch.samples.isEmpty()) { 524 mBatches.removeAt(i); 525 next = NULL; 526 } else { 527 next = &batch.samples.itemAt(0); 528 } 529 if (!result) { 530 resampleTouchState(sampleTime, static_cast<MotionEvent*>(*outEvent), next); 531 } 532 return result; 533 } 534 535 return WOULD_BLOCK; 536 } 537 538 status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory, 539 Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent) { 540 MotionEvent* motionEvent = factory->createMotionEvent(); 541 if (! motionEvent) return NO_MEMORY; 542 543 uint32_t chain = 0; 544 for (size_t i = 0; i < count; i++) { 545 InputMessage& msg = batch.samples.editItemAt(i); 546 updateTouchState(&msg); 547 if (i) { 548 SeqChain seqChain; 549 seqChain.seq = msg.body.motion.seq; 550 seqChain.chain = chain; 551 mSeqChains.push(seqChain); 552 addSample(motionEvent, &msg); 553 } else { 554 initializeMotionEvent(motionEvent, &msg); 555 } 556 chain = msg.body.motion.seq; 557 } 558 batch.samples.removeItemsAt(0, count); 559 560 *outSeq = chain; 561 *outEvent = motionEvent; 562 return OK; 563 } 564 565 void InputConsumer::updateTouchState(InputMessage* msg) { 566 if (!mResampleTouch || 567 !(msg->body.motion.source & AINPUT_SOURCE_CLASS_POINTER)) { 568 return; 569 } 570 571 int32_t deviceId = msg->body.motion.deviceId; 572 int32_t source = msg->body.motion.source; 573 nsecs_t eventTime = msg->body.motion.eventTime; 574 575 // Update the touch state history to incorporate the new input message. 576 // If the message is in the past relative to the most recently produced resampled 577 // touch, then use the resampled time and coordinates instead. 578 switch (msg->body.motion.action & AMOTION_EVENT_ACTION_MASK) { 579 case AMOTION_EVENT_ACTION_DOWN: { 580 ssize_t index = findTouchState(deviceId, source); 581 if (index < 0) { 582 mTouchStates.push(); 583 index = mTouchStates.size() - 1; 584 } 585 TouchState& touchState = mTouchStates.editItemAt(index); 586 touchState.initialize(deviceId, source); 587 touchState.addHistory(msg); 588 break; 589 } 590 591 case AMOTION_EVENT_ACTION_MOVE: { 592 ssize_t index = findTouchState(deviceId, source); 593 if (index >= 0) { 594 TouchState& touchState = mTouchStates.editItemAt(index); 595 touchState.addHistory(msg); 596 if (eventTime < touchState.lastResample.eventTime) { 597 rewriteMessage(touchState, msg); 598 } else { 599 touchState.lastResample.idBits.clear(); 600 } 601 } 602 break; 603 } 604 605 case AMOTION_EVENT_ACTION_POINTER_DOWN: { 606 ssize_t index = findTouchState(deviceId, source); 607 if (index >= 0) { 608 TouchState& touchState = mTouchStates.editItemAt(index); 609 touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); 610 rewriteMessage(touchState, msg); 611 } 612 break; 613 } 614 615 case AMOTION_EVENT_ACTION_POINTER_UP: { 616 ssize_t index = findTouchState(deviceId, source); 617 if (index >= 0) { 618 TouchState& touchState = mTouchStates.editItemAt(index); 619 rewriteMessage(touchState, msg); 620 touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); 621 } 622 break; 623 } 624 625 case AMOTION_EVENT_ACTION_SCROLL: { 626 ssize_t index = findTouchState(deviceId, source); 627 if (index >= 0) { 628 const TouchState& touchState = mTouchStates.itemAt(index); 629 rewriteMessage(touchState, msg); 630 } 631 break; 632 } 633 634 case AMOTION_EVENT_ACTION_UP: 635 case AMOTION_EVENT_ACTION_CANCEL: { 636 ssize_t index = findTouchState(deviceId, source); 637 if (index >= 0) { 638 const TouchState& touchState = mTouchStates.itemAt(index); 639 rewriteMessage(touchState, msg); 640 mTouchStates.removeAt(index); 641 } 642 break; 643 } 644 } 645 } 646 647 void InputConsumer::rewriteMessage(const TouchState& state, InputMessage* msg) { 648 for (size_t i = 0; i < msg->body.motion.pointerCount; i++) { 649 uint32_t id = msg->body.motion.pointers[i].properties.id; 650 if (state.lastResample.idBits.hasBit(id)) { 651 PointerCoords& msgCoords = msg->body.motion.pointers[i].coords; 652 const PointerCoords& resampleCoords = state.lastResample.getPointerById(id); 653 #if DEBUG_RESAMPLING 654 ALOGD("[%d] - rewrite (%0.3f, %0.3f), old (%0.3f, %0.3f)", id, 655 resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_X), 656 resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_Y), 657 msgCoords.getAxisValue(AMOTION_EVENT_AXIS_X), 658 msgCoords.getAxisValue(AMOTION_EVENT_AXIS_Y)); 659 #endif 660 msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX()); 661 msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY()); 662 } 663 } 664 } 665 666 void InputConsumer::resampleTouchState(nsecs_t sampleTime, MotionEvent* event, 667 const InputMessage* next) { 668 if (!mResampleTouch 669 || !(event->getSource() & AINPUT_SOURCE_CLASS_POINTER) 670 || event->getAction() != AMOTION_EVENT_ACTION_MOVE) { 671 return; 672 } 673 674 ssize_t index = findTouchState(event->getDeviceId(), event->getSource()); 675 if (index < 0) { 676 #if DEBUG_RESAMPLING 677 ALOGD("Not resampled, no touch state for device."); 678 #endif 679 return; 680 } 681 682 TouchState& touchState = mTouchStates.editItemAt(index); 683 if (touchState.historySize < 1) { 684 #if DEBUG_RESAMPLING 685 ALOGD("Not resampled, no history for device."); 686 #endif 687 return; 688 } 689 690 // Ensure that the current sample has all of the pointers that need to be reported. 691 const History* current = touchState.getHistory(0); 692 size_t pointerCount = event->getPointerCount(); 693 for (size_t i = 0; i < pointerCount; i++) { 694 uint32_t id = event->getPointerId(i); 695 if (!current->idBits.hasBit(id)) { 696 #if DEBUG_RESAMPLING 697 ALOGD("Not resampled, missing id %d", id); 698 #endif 699 return; 700 } 701 } 702 703 // Find the data to use for resampling. 704 const History* other; 705 History future; 706 float alpha; 707 if (next) { 708 // Interpolate between current sample and future sample. 709 // So current->eventTime <= sampleTime <= future.eventTime. 710 future.initializeFrom(next); 711 other = &future; 712 nsecs_t delta = future.eventTime - current->eventTime; 713 if (delta < RESAMPLE_MIN_DELTA) { 714 #if DEBUG_RESAMPLING 715 ALOGD("Not resampled, delta time is %lld ns.", delta); 716 #endif 717 return; 718 } 719 alpha = float(sampleTime - current->eventTime) / delta; 720 } else if (touchState.historySize >= 2) { 721 // Extrapolate future sample using current sample and past sample. 722 // So other->eventTime <= current->eventTime <= sampleTime. 723 other = touchState.getHistory(1); 724 nsecs_t delta = current->eventTime - other->eventTime; 725 if (delta < RESAMPLE_MIN_DELTA) { 726 #if DEBUG_RESAMPLING 727 ALOGD("Not resampled, delta time is %lld ns.", delta); 728 #endif 729 return; 730 } 731 nsecs_t maxPredict = current->eventTime + min(delta / 2, RESAMPLE_MAX_PREDICTION); 732 if (sampleTime > maxPredict) { 733 #if DEBUG_RESAMPLING 734 ALOGD("Sample time is too far in the future, adjusting prediction " 735 "from %lld to %lld ns.", 736 sampleTime - current->eventTime, maxPredict - current->eventTime); 737 #endif 738 sampleTime = maxPredict; 739 } 740 alpha = float(current->eventTime - sampleTime) / delta; 741 } else { 742 #if DEBUG_RESAMPLING 743 ALOGD("Not resampled, insufficient data."); 744 #endif 745 return; 746 } 747 748 // Resample touch coordinates. 749 touchState.lastResample.eventTime = sampleTime; 750 touchState.lastResample.idBits.clear(); 751 for (size_t i = 0; i < pointerCount; i++) { 752 uint32_t id = event->getPointerId(i); 753 touchState.lastResample.idToIndex[id] = i; 754 touchState.lastResample.idBits.markBit(id); 755 PointerCoords& resampledCoords = touchState.lastResample.pointers[i]; 756 const PointerCoords& currentCoords = current->getPointerById(id); 757 if (other->idBits.hasBit(id) 758 && shouldResampleTool(event->getToolType(i))) { 759 const PointerCoords& otherCoords = other->getPointerById(id); 760 resampledCoords.copyFrom(currentCoords); 761 resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_X, 762 lerp(currentCoords.getX(), otherCoords.getX(), alpha)); 763 resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, 764 lerp(currentCoords.getY(), otherCoords.getY(), alpha)); 765 #if DEBUG_RESAMPLING 766 ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f), " 767 "other (%0.3f, %0.3f), alpha %0.3f", 768 id, resampledCoords.getX(), resampledCoords.getY(), 769 currentCoords.getX(), currentCoords.getY(), 770 otherCoords.getX(), otherCoords.getY(), 771 alpha); 772 #endif 773 } else { 774 resampledCoords.copyFrom(currentCoords); 775 #if DEBUG_RESAMPLING 776 ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f)", 777 id, resampledCoords.getX(), resampledCoords.getY(), 778 currentCoords.getX(), currentCoords.getY()); 779 #endif 780 } 781 } 782 783 event->addSample(sampleTime, touchState.lastResample.pointers); 784 } 785 786 bool InputConsumer::shouldResampleTool(int32_t toolType) { 787 return toolType == AMOTION_EVENT_TOOL_TYPE_FINGER 788 || toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN; 789 } 790 791 status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) { 792 #if DEBUG_TRANSPORT_ACTIONS 793 ALOGD("channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s", 794 mChannel->getName().string(), seq, handled ? "true" : "false"); 795 #endif 796 797 if (!seq) { 798 ALOGE("Attempted to send a finished signal with sequence number 0."); 799 return BAD_VALUE; 800 } 801 802 // Send finished signals for the batch sequence chain first. 803 size_t seqChainCount = mSeqChains.size(); 804 if (seqChainCount) { 805 uint32_t currentSeq = seq; 806 uint32_t chainSeqs[seqChainCount]; 807 size_t chainIndex = 0; 808 for (size_t i = seqChainCount; i-- > 0; ) { 809 const SeqChain& seqChain = mSeqChains.itemAt(i); 810 if (seqChain.seq == currentSeq) { 811 currentSeq = seqChain.chain; 812 chainSeqs[chainIndex++] = currentSeq; 813 mSeqChains.removeAt(i); 814 } 815 } 816 status_t status = OK; 817 while (!status && chainIndex-- > 0) { 818 status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled); 819 } 820 if (status) { 821 // An error occurred so at least one signal was not sent, reconstruct the chain. 822 do { 823 SeqChain seqChain; 824 seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq; 825 seqChain.chain = chainSeqs[chainIndex]; 826 mSeqChains.push(seqChain); 827 } while (chainIndex-- > 0); 828 return status; 829 } 830 } 831 832 // Send finished signal for the last message in the batch. 833 return sendUnchainedFinishedSignal(seq, handled); 834 } 835 836 status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) { 837 InputMessage msg; 838 msg.header.type = InputMessage::TYPE_FINISHED; 839 msg.body.finished.seq = seq; 840 msg.body.finished.handled = handled; 841 return mChannel->sendMessage(&msg); 842 } 843 844 bool InputConsumer::hasDeferredEvent() const { 845 return mMsgDeferred; 846 } 847 848 bool InputConsumer::hasPendingBatch() const { 849 return !mBatches.isEmpty(); 850 } 851 852 ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const { 853 for (size_t i = 0; i < mBatches.size(); i++) { 854 const Batch& batch = mBatches.itemAt(i); 855 const InputMessage& head = batch.samples.itemAt(0); 856 if (head.body.motion.deviceId == deviceId && head.body.motion.source == source) { 857 return i; 858 } 859 } 860 return -1; 861 } 862 863 ssize_t InputConsumer::findTouchState(int32_t deviceId, int32_t source) const { 864 for (size_t i = 0; i < mTouchStates.size(); i++) { 865 const TouchState& touchState = mTouchStates.itemAt(i); 866 if (touchState.deviceId == deviceId && touchState.source == source) { 867 return i; 868 } 869 } 870 return -1; 871 } 872 873 void InputConsumer::initializeKeyEvent(KeyEvent* event, const InputMessage* msg) { 874 event->initialize( 875 msg->body.key.deviceId, 876 msg->body.key.source, 877 msg->body.key.action, 878 msg->body.key.flags, 879 msg->body.key.keyCode, 880 msg->body.key.scanCode, 881 msg->body.key.metaState, 882 msg->body.key.repeatCount, 883 msg->body.key.downTime, 884 msg->body.key.eventTime); 885 } 886 887 void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) { 888 size_t pointerCount = msg->body.motion.pointerCount; 889 PointerProperties pointerProperties[pointerCount]; 890 PointerCoords pointerCoords[pointerCount]; 891 for (size_t i = 0; i < pointerCount; i++) { 892 pointerProperties[i].copyFrom(msg->body.motion.pointers[i].properties); 893 pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); 894 } 895 896 event->initialize( 897 msg->body.motion.deviceId, 898 msg->body.motion.source, 899 msg->body.motion.action, 900 msg->body.motion.flags, 901 msg->body.motion.edgeFlags, 902 msg->body.motion.metaState, 903 msg->body.motion.buttonState, 904 msg->body.motion.xOffset, 905 msg->body.motion.yOffset, 906 msg->body.motion.xPrecision, 907 msg->body.motion.yPrecision, 908 msg->body.motion.downTime, 909 msg->body.motion.eventTime, 910 pointerCount, 911 pointerProperties, 912 pointerCoords); 913 } 914 915 void InputConsumer::addSample(MotionEvent* event, const InputMessage* msg) { 916 size_t pointerCount = msg->body.motion.pointerCount; 917 PointerCoords pointerCoords[pointerCount]; 918 for (size_t i = 0; i < pointerCount; i++) { 919 pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); 920 } 921 922 event->setMetaState(event->getMetaState() | msg->body.motion.metaState); 923 event->addSample(msg->body.motion.eventTime, pointerCoords); 924 } 925 926 bool InputConsumer::canAddSample(const Batch& batch, const InputMessage *msg) { 927 const InputMessage& head = batch.samples.itemAt(0); 928 size_t pointerCount = msg->body.motion.pointerCount; 929 if (head.body.motion.pointerCount != pointerCount 930 || head.body.motion.action != msg->body.motion.action) { 931 return false; 932 } 933 for (size_t i = 0; i < pointerCount; i++) { 934 if (head.body.motion.pointers[i].properties 935 != msg->body.motion.pointers[i].properties) { 936 return false; 937 } 938 } 939 return true; 940 } 941 942 ssize_t InputConsumer::findSampleNoLaterThan(const Batch& batch, nsecs_t time) { 943 size_t numSamples = batch.samples.size(); 944 size_t index = 0; 945 while (index < numSamples 946 && batch.samples.itemAt(index).body.motion.eventTime <= time) { 947 index += 1; 948 } 949 return ssize_t(index) - 1; 950 } 951 952 } // namespace android 953
