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 sp<InputChannel> InputChannel::dup() const { 223 int fd = ::dup(getFd()); 224 return fd >= 0 ? new InputChannel(getName(), fd) : NULL; 225 } 226 227 228 // --- InputPublisher --- 229 230 InputPublisher::InputPublisher(const sp<InputChannel>& channel) : 231 mChannel(channel) { 232 } 233 234 InputPublisher::~InputPublisher() { 235 } 236 237 status_t InputPublisher::publishKeyEvent( 238 uint32_t seq, 239 int32_t deviceId, 240 int32_t source, 241 int32_t action, 242 int32_t flags, 243 int32_t keyCode, 244 int32_t scanCode, 245 int32_t metaState, 246 int32_t repeatCount, 247 nsecs_t downTime, 248 nsecs_t eventTime) { 249 #if DEBUG_TRANSPORT_ACTIONS 250 ALOGD("channel '%s' publisher ~ publishKeyEvent: seq=%u, deviceId=%d, source=0x%x, " 251 "action=0x%x, flags=0x%x, keyCode=%d, scanCode=%d, metaState=0x%x, repeatCount=%d," 252 "downTime=%lld, eventTime=%lld", 253 mChannel->getName().string(), seq, 254 deviceId, source, action, flags, keyCode, scanCode, metaState, repeatCount, 255 downTime, eventTime); 256 #endif 257 258 if (!seq) { 259 ALOGE("Attempted to publish a key event with sequence number 0."); 260 return BAD_VALUE; 261 } 262 263 InputMessage msg; 264 msg.header.type = InputMessage::TYPE_KEY; 265 msg.body.key.seq = seq; 266 msg.body.key.deviceId = deviceId; 267 msg.body.key.source = source; 268 msg.body.key.action = action; 269 msg.body.key.flags = flags; 270 msg.body.key.keyCode = keyCode; 271 msg.body.key.scanCode = scanCode; 272 msg.body.key.metaState = metaState; 273 msg.body.key.repeatCount = repeatCount; 274 msg.body.key.downTime = downTime; 275 msg.body.key.eventTime = eventTime; 276 return mChannel->sendMessage(&msg); 277 } 278 279 status_t InputPublisher::publishMotionEvent( 280 uint32_t seq, 281 int32_t deviceId, 282 int32_t source, 283 int32_t action, 284 int32_t flags, 285 int32_t edgeFlags, 286 int32_t metaState, 287 int32_t buttonState, 288 float xOffset, 289 float yOffset, 290 float xPrecision, 291 float yPrecision, 292 nsecs_t downTime, 293 nsecs_t eventTime, 294 size_t pointerCount, 295 const PointerProperties* pointerProperties, 296 const PointerCoords* pointerCoords) { 297 #if DEBUG_TRANSPORT_ACTIONS 298 ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, " 299 "action=0x%x, flags=0x%x, edgeFlags=0x%x, metaState=0x%x, buttonState=0x%x, " 300 "xOffset=%f, yOffset=%f, " 301 "xPrecision=%f, yPrecision=%f, downTime=%lld, eventTime=%lld, " 302 "pointerCount=%d", 303 mChannel->getName().string(), seq, 304 deviceId, source, action, flags, edgeFlags, metaState, buttonState, 305 xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount); 306 #endif 307 308 if (!seq) { 309 ALOGE("Attempted to publish a motion event with sequence number 0."); 310 return BAD_VALUE; 311 } 312 313 if (pointerCount > MAX_POINTERS || pointerCount < 1) { 314 ALOGE("channel '%s' publisher ~ Invalid number of pointers provided: %d.", 315 mChannel->getName().string(), pointerCount); 316 return BAD_VALUE; 317 } 318 319 InputMessage msg; 320 msg.header.type = InputMessage::TYPE_MOTION; 321 msg.body.motion.seq = seq; 322 msg.body.motion.deviceId = deviceId; 323 msg.body.motion.source = source; 324 msg.body.motion.action = action; 325 msg.body.motion.flags = flags; 326 msg.body.motion.edgeFlags = edgeFlags; 327 msg.body.motion.metaState = metaState; 328 msg.body.motion.buttonState = buttonState; 329 msg.body.motion.xOffset = xOffset; 330 msg.body.motion.yOffset = yOffset; 331 msg.body.motion.xPrecision = xPrecision; 332 msg.body.motion.yPrecision = yPrecision; 333 msg.body.motion.downTime = downTime; 334 msg.body.motion.eventTime = eventTime; 335 msg.body.motion.pointerCount = pointerCount; 336 for (size_t i = 0; i < pointerCount; i++) { 337 msg.body.motion.pointers[i].properties.copyFrom(pointerProperties[i]); 338 msg.body.motion.pointers[i].coords.copyFrom(pointerCoords[i]); 339 } 340 return mChannel->sendMessage(&msg); 341 } 342 343 status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) { 344 #if DEBUG_TRANSPORT_ACTIONS 345 ALOGD("channel '%s' publisher ~ receiveFinishedSignal", 346 mChannel->getName().string()); 347 #endif 348 349 InputMessage msg; 350 status_t result = mChannel->receiveMessage(&msg); 351 if (result) { 352 *outSeq = 0; 353 *outHandled = false; 354 return result; 355 } 356 if (msg.header.type != InputMessage::TYPE_FINISHED) { 357 ALOGE("channel '%s' publisher ~ Received unexpected message of type %d from consumer", 358 mChannel->getName().string(), msg.header.type); 359 return UNKNOWN_ERROR; 360 } 361 *outSeq = msg.body.finished.seq; 362 *outHandled = msg.body.finished.handled; 363 return OK; 364 } 365 366 // --- InputConsumer --- 367 368 InputConsumer::InputConsumer(const sp<InputChannel>& channel) : 369 mResampleTouch(isTouchResamplingEnabled()), 370 mChannel(channel), mMsgDeferred(false) { 371 } 372 373 InputConsumer::~InputConsumer() { 374 } 375 376 bool InputConsumer::isTouchResamplingEnabled() { 377 char value[PROPERTY_VALUE_MAX]; 378 int length = property_get("debug.inputconsumer.resample", value, NULL); 379 if (length > 0) { 380 if (!strcmp("0", value)) { 381 return false; 382 } 383 if (strcmp("1", value)) { 384 ALOGD("Unrecognized property value for 'debug.inputconsumer.resample'. " 385 "Use '1' or '0'."); 386 } 387 } 388 return true; 389 } 390 391 status_t InputConsumer::consume(InputEventFactoryInterface* factory, 392 bool consumeBatches, nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { 393 #if DEBUG_TRANSPORT_ACTIONS 394 ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%lld", 395 mChannel->getName().string(), consumeBatches ? "true" : "false", frameTime); 396 #endif 397 398 *outSeq = 0; 399 *outEvent = NULL; 400 401 // Fetch the next input message. 402 // Loop until an event can be returned or no additional events are received. 403 while (!*outEvent) { 404 if (mMsgDeferred) { 405 // mMsg contains a valid input message from the previous call to consume 406 // that has not yet been processed. 407 mMsgDeferred = false; 408 } else { 409 // Receive a fresh message. 410 status_t result = mChannel->receiveMessage(&mMsg); 411 if (result) { 412 // Consume the next batched event unless batches are being held for later. 413 if (consumeBatches || result != WOULD_BLOCK) { 414 result = consumeBatch(factory, frameTime, outSeq, outEvent); 415 if (*outEvent) { 416 #if DEBUG_TRANSPORT_ACTIONS 417 ALOGD("channel '%s' consumer ~ consumed batch event, seq=%u", 418 mChannel->getName().string(), *outSeq); 419 #endif 420 break; 421 } 422 } 423 return result; 424 } 425 } 426 427 switch (mMsg.header.type) { 428 case InputMessage::TYPE_KEY: { 429 KeyEvent* keyEvent = factory->createKeyEvent(); 430 if (!keyEvent) return NO_MEMORY; 431 432 initializeKeyEvent(keyEvent, &mMsg); 433 *outSeq = mMsg.body.key.seq; 434 *outEvent = keyEvent; 435 #if DEBUG_TRANSPORT_ACTIONS 436 ALOGD("channel '%s' consumer ~ consumed key event, seq=%u", 437 mChannel->getName().string(), *outSeq); 438 #endif 439 break; 440 } 441 442 case AINPUT_EVENT_TYPE_MOTION: { 443 ssize_t batchIndex = findBatch(mMsg.body.motion.deviceId, mMsg.body.motion.source); 444 if (batchIndex >= 0) { 445 Batch& batch = mBatches.editItemAt(batchIndex); 446 if (canAddSample(batch, &mMsg)) { 447 batch.samples.push(mMsg); 448 #if DEBUG_TRANSPORT_ACTIONS 449 ALOGD("channel '%s' consumer ~ appended to batch event", 450 mChannel->getName().string()); 451 #endif 452 break; 453 } else { 454 // We cannot append to the batch in progress, so we need to consume 455 // the previous batch right now and defer the new message until later. 456 mMsgDeferred = true; 457 status_t result = consumeSamples(factory, 458 batch, batch.samples.size(), outSeq, outEvent); 459 mBatches.removeAt(batchIndex); 460 if (result) { 461 return result; 462 } 463 #if DEBUG_TRANSPORT_ACTIONS 464 ALOGD("channel '%s' consumer ~ consumed batch event and " 465 "deferred current event, seq=%u", 466 mChannel->getName().string(), *outSeq); 467 #endif 468 break; 469 } 470 } 471 472 // Start a new batch if needed. 473 if (mMsg.body.motion.action == AMOTION_EVENT_ACTION_MOVE 474 || mMsg.body.motion.action == AMOTION_EVENT_ACTION_HOVER_MOVE) { 475 mBatches.push(); 476 Batch& batch = mBatches.editTop(); 477 batch.samples.push(mMsg); 478 #if DEBUG_TRANSPORT_ACTIONS 479 ALOGD("channel '%s' consumer ~ started batch event", 480 mChannel->getName().string()); 481 #endif 482 break; 483 } 484 485 MotionEvent* motionEvent = factory->createMotionEvent(); 486 if (! motionEvent) return NO_MEMORY; 487 488 updateTouchState(&mMsg); 489 initializeMotionEvent(motionEvent, &mMsg); 490 *outSeq = mMsg.body.motion.seq; 491 *outEvent = motionEvent; 492 #if DEBUG_TRANSPORT_ACTIONS 493 ALOGD("channel '%s' consumer ~ consumed motion event, seq=%u", 494 mChannel->getName().string(), *outSeq); 495 #endif 496 break; 497 } 498 499 default: 500 ALOGE("channel '%s' consumer ~ Received unexpected message of type %d", 501 mChannel->getName().string(), mMsg.header.type); 502 return UNKNOWN_ERROR; 503 } 504 } 505 return OK; 506 } 507 508 status_t InputConsumer::consumeBatch(InputEventFactoryInterface* factory, 509 nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { 510 status_t result; 511 for (size_t i = mBatches.size(); i-- > 0; ) { 512 Batch& batch = mBatches.editItemAt(i); 513 if (frameTime < 0) { 514 result = consumeSamples(factory, batch, batch.samples.size(), 515 outSeq, outEvent); 516 mBatches.removeAt(i); 517 return result; 518 } 519 520 nsecs_t sampleTime = frameTime - RESAMPLE_LATENCY; 521 ssize_t split = findSampleNoLaterThan(batch, sampleTime); 522 if (split < 0) { 523 continue; 524 } 525 526 result = consumeSamples(factory, batch, split + 1, outSeq, outEvent); 527 const InputMessage* next; 528 if (batch.samples.isEmpty()) { 529 mBatches.removeAt(i); 530 next = NULL; 531 } else { 532 next = &batch.samples.itemAt(0); 533 } 534 if (!result) { 535 resampleTouchState(sampleTime, static_cast<MotionEvent*>(*outEvent), next); 536 } 537 return result; 538 } 539 540 return WOULD_BLOCK; 541 } 542 543 status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory, 544 Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent) { 545 MotionEvent* motionEvent = factory->createMotionEvent(); 546 if (! motionEvent) return NO_MEMORY; 547 548 uint32_t chain = 0; 549 for (size_t i = 0; i < count; i++) { 550 InputMessage& msg = batch.samples.editItemAt(i); 551 updateTouchState(&msg); 552 if (i) { 553 SeqChain seqChain; 554 seqChain.seq = msg.body.motion.seq; 555 seqChain.chain = chain; 556 mSeqChains.push(seqChain); 557 addSample(motionEvent, &msg); 558 } else { 559 initializeMotionEvent(motionEvent, &msg); 560 } 561 chain = msg.body.motion.seq; 562 } 563 batch.samples.removeItemsAt(0, count); 564 565 *outSeq = chain; 566 *outEvent = motionEvent; 567 return OK; 568 } 569 570 void InputConsumer::updateTouchState(InputMessage* msg) { 571 if (!mResampleTouch || 572 !(msg->body.motion.source & AINPUT_SOURCE_CLASS_POINTER)) { 573 return; 574 } 575 576 int32_t deviceId = msg->body.motion.deviceId; 577 int32_t source = msg->body.motion.source; 578 nsecs_t eventTime = msg->body.motion.eventTime; 579 580 // Update the touch state history to incorporate the new input message. 581 // If the message is in the past relative to the most recently produced resampled 582 // touch, then use the resampled time and coordinates instead. 583 switch (msg->body.motion.action & AMOTION_EVENT_ACTION_MASK) { 584 case AMOTION_EVENT_ACTION_DOWN: { 585 ssize_t index = findTouchState(deviceId, source); 586 if (index < 0) { 587 mTouchStates.push(); 588 index = mTouchStates.size() - 1; 589 } 590 TouchState& touchState = mTouchStates.editItemAt(index); 591 touchState.initialize(deviceId, source); 592 touchState.addHistory(msg); 593 break; 594 } 595 596 case AMOTION_EVENT_ACTION_MOVE: { 597 ssize_t index = findTouchState(deviceId, source); 598 if (index >= 0) { 599 TouchState& touchState = mTouchStates.editItemAt(index); 600 touchState.addHistory(msg); 601 if (eventTime < touchState.lastResample.eventTime) { 602 rewriteMessage(touchState, msg); 603 } else { 604 touchState.lastResample.idBits.clear(); 605 } 606 } 607 break; 608 } 609 610 case AMOTION_EVENT_ACTION_POINTER_DOWN: { 611 ssize_t index = findTouchState(deviceId, source); 612 if (index >= 0) { 613 TouchState& touchState = mTouchStates.editItemAt(index); 614 touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); 615 rewriteMessage(touchState, msg); 616 } 617 break; 618 } 619 620 case AMOTION_EVENT_ACTION_POINTER_UP: { 621 ssize_t index = findTouchState(deviceId, source); 622 if (index >= 0) { 623 TouchState& touchState = mTouchStates.editItemAt(index); 624 rewriteMessage(touchState, msg); 625 touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); 626 } 627 break; 628 } 629 630 case AMOTION_EVENT_ACTION_SCROLL: { 631 ssize_t index = findTouchState(deviceId, source); 632 if (index >= 0) { 633 const TouchState& touchState = mTouchStates.itemAt(index); 634 rewriteMessage(touchState, msg); 635 } 636 break; 637 } 638 639 case AMOTION_EVENT_ACTION_UP: 640 case AMOTION_EVENT_ACTION_CANCEL: { 641 ssize_t index = findTouchState(deviceId, source); 642 if (index >= 0) { 643 const TouchState& touchState = mTouchStates.itemAt(index); 644 rewriteMessage(touchState, msg); 645 mTouchStates.removeAt(index); 646 } 647 break; 648 } 649 } 650 } 651 652 void InputConsumer::rewriteMessage(const TouchState& state, InputMessage* msg) { 653 for (size_t i = 0; i < msg->body.motion.pointerCount; i++) { 654 uint32_t id = msg->body.motion.pointers[i].properties.id; 655 if (state.lastResample.idBits.hasBit(id)) { 656 PointerCoords& msgCoords = msg->body.motion.pointers[i].coords; 657 const PointerCoords& resampleCoords = state.lastResample.getPointerById(id); 658 #if DEBUG_RESAMPLING 659 ALOGD("[%d] - rewrite (%0.3f, %0.3f), old (%0.3f, %0.3f)", id, 660 resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_X), 661 resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_Y), 662 msgCoords.getAxisValue(AMOTION_EVENT_AXIS_X), 663 msgCoords.getAxisValue(AMOTION_EVENT_AXIS_Y)); 664 #endif 665 msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX()); 666 msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY()); 667 } 668 } 669 } 670 671 void InputConsumer::resampleTouchState(nsecs_t sampleTime, MotionEvent* event, 672 const InputMessage* next) { 673 if (!mResampleTouch 674 || !(event->getSource() & AINPUT_SOURCE_CLASS_POINTER) 675 || event->getAction() != AMOTION_EVENT_ACTION_MOVE) { 676 return; 677 } 678 679 ssize_t index = findTouchState(event->getDeviceId(), event->getSource()); 680 if (index < 0) { 681 #if DEBUG_RESAMPLING 682 ALOGD("Not resampled, no touch state for device."); 683 #endif 684 return; 685 } 686 687 TouchState& touchState = mTouchStates.editItemAt(index); 688 if (touchState.historySize < 1) { 689 #if DEBUG_RESAMPLING 690 ALOGD("Not resampled, no history for device."); 691 #endif 692 return; 693 } 694 695 // Ensure that the current sample has all of the pointers that need to be reported. 696 const History* current = touchState.getHistory(0); 697 size_t pointerCount = event->getPointerCount(); 698 for (size_t i = 0; i < pointerCount; i++) { 699 uint32_t id = event->getPointerId(i); 700 if (!current->idBits.hasBit(id)) { 701 #if DEBUG_RESAMPLING 702 ALOGD("Not resampled, missing id %d", id); 703 #endif 704 return; 705 } 706 } 707 708 // Find the data to use for resampling. 709 const History* other; 710 History future; 711 float alpha; 712 if (next) { 713 // Interpolate between current sample and future sample. 714 // So current->eventTime <= sampleTime <= future.eventTime. 715 future.initializeFrom(next); 716 other = &future; 717 nsecs_t delta = future.eventTime - current->eventTime; 718 if (delta < RESAMPLE_MIN_DELTA) { 719 #if DEBUG_RESAMPLING 720 ALOGD("Not resampled, delta time is %lld ns.", delta); 721 #endif 722 return; 723 } 724 alpha = float(sampleTime - current->eventTime) / delta; 725 } else if (touchState.historySize >= 2) { 726 // Extrapolate future sample using current sample and past sample. 727 // So other->eventTime <= current->eventTime <= sampleTime. 728 other = touchState.getHistory(1); 729 nsecs_t delta = current->eventTime - other->eventTime; 730 if (delta < RESAMPLE_MIN_DELTA) { 731 #if DEBUG_RESAMPLING 732 ALOGD("Not resampled, delta time is %lld ns.", delta); 733 #endif 734 return; 735 } 736 nsecs_t maxPredict = current->eventTime + min(delta / 2, RESAMPLE_MAX_PREDICTION); 737 if (sampleTime > maxPredict) { 738 #if DEBUG_RESAMPLING 739 ALOGD("Sample time is too far in the future, adjusting prediction " 740 "from %lld to %lld ns.", 741 sampleTime - current->eventTime, maxPredict - current->eventTime); 742 #endif 743 sampleTime = maxPredict; 744 } 745 alpha = float(current->eventTime - sampleTime) / delta; 746 } else { 747 #if DEBUG_RESAMPLING 748 ALOGD("Not resampled, insufficient data."); 749 #endif 750 return; 751 } 752 753 // Resample touch coordinates. 754 touchState.lastResample.eventTime = sampleTime; 755 touchState.lastResample.idBits.clear(); 756 for (size_t i = 0; i < pointerCount; i++) { 757 uint32_t id = event->getPointerId(i); 758 touchState.lastResample.idToIndex[id] = i; 759 touchState.lastResample.idBits.markBit(id); 760 PointerCoords& resampledCoords = touchState.lastResample.pointers[i]; 761 const PointerCoords& currentCoords = current->getPointerById(id); 762 if (other->idBits.hasBit(id) 763 && shouldResampleTool(event->getToolType(i))) { 764 const PointerCoords& otherCoords = other->getPointerById(id); 765 resampledCoords.copyFrom(currentCoords); 766 resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_X, 767 lerp(currentCoords.getX(), otherCoords.getX(), alpha)); 768 resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, 769 lerp(currentCoords.getY(), otherCoords.getY(), alpha)); 770 #if DEBUG_RESAMPLING 771 ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f), " 772 "other (%0.3f, %0.3f), alpha %0.3f", 773 id, resampledCoords.getX(), resampledCoords.getY(), 774 currentCoords.getX(), currentCoords.getY(), 775 otherCoords.getX(), otherCoords.getY(), 776 alpha); 777 #endif 778 } else { 779 resampledCoords.copyFrom(currentCoords); 780 #if DEBUG_RESAMPLING 781 ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f)", 782 id, resampledCoords.getX(), resampledCoords.getY(), 783 currentCoords.getX(), currentCoords.getY()); 784 #endif 785 } 786 } 787 788 event->addSample(sampleTime, touchState.lastResample.pointers); 789 } 790 791 bool InputConsumer::shouldResampleTool(int32_t toolType) { 792 return toolType == AMOTION_EVENT_TOOL_TYPE_FINGER 793 || toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN; 794 } 795 796 status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) { 797 #if DEBUG_TRANSPORT_ACTIONS 798 ALOGD("channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s", 799 mChannel->getName().string(), seq, handled ? "true" : "false"); 800 #endif 801 802 if (!seq) { 803 ALOGE("Attempted to send a finished signal with sequence number 0."); 804 return BAD_VALUE; 805 } 806 807 // Send finished signals for the batch sequence chain first. 808 size_t seqChainCount = mSeqChains.size(); 809 if (seqChainCount) { 810 uint32_t currentSeq = seq; 811 uint32_t chainSeqs[seqChainCount]; 812 size_t chainIndex = 0; 813 for (size_t i = seqChainCount; i-- > 0; ) { 814 const SeqChain& seqChain = mSeqChains.itemAt(i); 815 if (seqChain.seq == currentSeq) { 816 currentSeq = seqChain.chain; 817 chainSeqs[chainIndex++] = currentSeq; 818 mSeqChains.removeAt(i); 819 } 820 } 821 status_t status = OK; 822 while (!status && chainIndex-- > 0) { 823 status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled); 824 } 825 if (status) { 826 // An error occurred so at least one signal was not sent, reconstruct the chain. 827 do { 828 SeqChain seqChain; 829 seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq; 830 seqChain.chain = chainSeqs[chainIndex]; 831 mSeqChains.push(seqChain); 832 } while (chainIndex-- > 0); 833 return status; 834 } 835 } 836 837 // Send finished signal for the last message in the batch. 838 return sendUnchainedFinishedSignal(seq, handled); 839 } 840 841 status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) { 842 InputMessage msg; 843 msg.header.type = InputMessage::TYPE_FINISHED; 844 msg.body.finished.seq = seq; 845 msg.body.finished.handled = handled; 846 return mChannel->sendMessage(&msg); 847 } 848 849 bool InputConsumer::hasDeferredEvent() const { 850 return mMsgDeferred; 851 } 852 853 bool InputConsumer::hasPendingBatch() const { 854 return !mBatches.isEmpty(); 855 } 856 857 ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const { 858 for (size_t i = 0; i < mBatches.size(); i++) { 859 const Batch& batch = mBatches.itemAt(i); 860 const InputMessage& head = batch.samples.itemAt(0); 861 if (head.body.motion.deviceId == deviceId && head.body.motion.source == source) { 862 return i; 863 } 864 } 865 return -1; 866 } 867 868 ssize_t InputConsumer::findTouchState(int32_t deviceId, int32_t source) const { 869 for (size_t i = 0; i < mTouchStates.size(); i++) { 870 const TouchState& touchState = mTouchStates.itemAt(i); 871 if (touchState.deviceId == deviceId && touchState.source == source) { 872 return i; 873 } 874 } 875 return -1; 876 } 877 878 void InputConsumer::initializeKeyEvent(KeyEvent* event, const InputMessage* msg) { 879 event->initialize( 880 msg->body.key.deviceId, 881 msg->body.key.source, 882 msg->body.key.action, 883 msg->body.key.flags, 884 msg->body.key.keyCode, 885 msg->body.key.scanCode, 886 msg->body.key.metaState, 887 msg->body.key.repeatCount, 888 msg->body.key.downTime, 889 msg->body.key.eventTime); 890 } 891 892 void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) { 893 size_t pointerCount = msg->body.motion.pointerCount; 894 PointerProperties pointerProperties[pointerCount]; 895 PointerCoords pointerCoords[pointerCount]; 896 for (size_t i = 0; i < pointerCount; i++) { 897 pointerProperties[i].copyFrom(msg->body.motion.pointers[i].properties); 898 pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); 899 } 900 901 event->initialize( 902 msg->body.motion.deviceId, 903 msg->body.motion.source, 904 msg->body.motion.action, 905 msg->body.motion.flags, 906 msg->body.motion.edgeFlags, 907 msg->body.motion.metaState, 908 msg->body.motion.buttonState, 909 msg->body.motion.xOffset, 910 msg->body.motion.yOffset, 911 msg->body.motion.xPrecision, 912 msg->body.motion.yPrecision, 913 msg->body.motion.downTime, 914 msg->body.motion.eventTime, 915 pointerCount, 916 pointerProperties, 917 pointerCoords); 918 } 919 920 void InputConsumer::addSample(MotionEvent* event, const InputMessage* msg) { 921 size_t pointerCount = msg->body.motion.pointerCount; 922 PointerCoords pointerCoords[pointerCount]; 923 for (size_t i = 0; i < pointerCount; i++) { 924 pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); 925 } 926 927 event->setMetaState(event->getMetaState() | msg->body.motion.metaState); 928 event->addSample(msg->body.motion.eventTime, pointerCoords); 929 } 930 931 bool InputConsumer::canAddSample(const Batch& batch, const InputMessage *msg) { 932 const InputMessage& head = batch.samples.itemAt(0); 933 size_t pointerCount = msg->body.motion.pointerCount; 934 if (head.body.motion.pointerCount != pointerCount 935 || head.body.motion.action != msg->body.motion.action) { 936 return false; 937 } 938 for (size_t i = 0; i < pointerCount; i++) { 939 if (head.body.motion.pointers[i].properties 940 != msg->body.motion.pointers[i].properties) { 941 return false; 942 } 943 } 944 return true; 945 } 946 947 ssize_t InputConsumer::findSampleNoLaterThan(const Batch& batch, nsecs_t time) { 948 size_t numSamples = batch.samples.size(); 949 size_t index = 0; 950 while (index < numSamples 951 && batch.samples.itemAt(index).body.motion.eventTime <= time) { 952 index += 1; 953 } 954 return ssize_t(index) - 1; 955 } 956 957 } // namespace android 958
