| // | |
| // Copyright 2010 The Android Open Source Project | |
| // | |
| // Provides a shared memory transport for input events. | |
| // | |
| #define LOG_TAG "InputTransport" | |
| //#define LOG_NDEBUG 0 | |
| // Log debug messages about channel messages (send message, receive message) | |
| #define DEBUG_CHANNEL_MESSAGES 0 | |
| // Log debug messages whenever InputChannel objects are created/destroyed | |
| #define DEBUG_CHANNEL_LIFECYCLE 0 | |
| // Log debug messages about transport actions | |
| #define DEBUG_TRANSPORT_ACTIONS 0 | |
| // Log debug messages about touch event resampling | |
| #define DEBUG_RESAMPLING 0 | |
| #include <errno.h> | |
| #include <fcntl.h> | |
| #include <inttypes.h> | |
| #include <math.h> | |
| #include <sys/socket.h> | |
| #include <sys/types.h> | |
| #include <unistd.h> | |
| #include <cutils/properties.h> | |
| #include <log/log.h> | |
| #include <input/InputTransport.h> | |
| namespace android { | |
| // Socket buffer size. The default is typically about 128KB, which is much larger than | |
| // we really need. So we make it smaller. It just needs to be big enough to hold | |
| // a few dozen large multi-finger motion events in the case where an application gets | |
| // behind processing touches. | |
| static const size_t SOCKET_BUFFER_SIZE = 32 * 1024; | |
| // Nanoseconds per milliseconds. | |
| static const nsecs_t NANOS_PER_MS = 1000000; | |
| // Latency added during resampling. A few milliseconds doesn't hurt much but | |
| // reduces the impact of mispredicted touch positions. | |
| static const nsecs_t RESAMPLE_LATENCY = 5 * NANOS_PER_MS; | |
| // Minimum time difference between consecutive samples before attempting to resample. | |
| static const nsecs_t RESAMPLE_MIN_DELTA = 2 * NANOS_PER_MS; | |
| // Maximum time difference between consecutive samples before attempting to resample | |
| // by extrapolation. | |
| static const nsecs_t RESAMPLE_MAX_DELTA = 20 * NANOS_PER_MS; | |
| // Maximum time to predict forward from the last known state, to avoid predicting too | |
| // far into the future. This time is further bounded by 50% of the last time delta. | |
| static const nsecs_t RESAMPLE_MAX_PREDICTION = 8 * NANOS_PER_MS; | |
| template<typename T> | |
| inline static T min(const T& a, const T& b) { | |
| return a < b ? a : b; | |
| } | |
| inline static float lerp(float a, float b, float alpha) { | |
| return a + alpha * (b - a); | |
| } | |
| // --- InputMessage --- | |
| bool InputMessage::isValid(size_t actualSize) const { | |
| if (size() == actualSize) { | |
| switch (header.type) { | |
| case TYPE_KEY: | |
| return true; | |
| case TYPE_MOTION: | |
| return body.motion.pointerCount > 0 | |
| && body.motion.pointerCount <= MAX_POINTERS; | |
| case TYPE_FINISHED: | |
| return true; | |
| } | |
| } | |
| return false; | |
| } | |
| size_t InputMessage::size() const { | |
| switch (header.type) { | |
| case TYPE_KEY: | |
| return sizeof(Header) + body.key.size(); | |
| case TYPE_MOTION: | |
| return sizeof(Header) + body.motion.size(); | |
| case TYPE_FINISHED: | |
| return sizeof(Header) + body.finished.size(); | |
| } | |
| return sizeof(Header); | |
| } | |
| // --- InputChannel --- | |
| InputChannel::InputChannel(const String8& name, int fd) : | |
| mName(name), mFd(fd) { | |
| #if DEBUG_CHANNEL_LIFECYCLE | |
| ALOGD("Input channel constructed: name='%s', fd=%d", | |
| mName.string(), fd); | |
| #endif | |
| int result = fcntl(mFd, F_SETFL, O_NONBLOCK); | |
| LOG_ALWAYS_FATAL_IF(result != 0, "channel '%s' ~ Could not make socket " | |
| "non-blocking. errno=%d", mName.string(), errno); | |
| } | |
| InputChannel::~InputChannel() { | |
| #if DEBUG_CHANNEL_LIFECYCLE | |
| ALOGD("Input channel destroyed: name='%s', fd=%d", | |
| mName.string(), mFd); | |
| #endif | |
| ::close(mFd); | |
| } | |
| status_t InputChannel::openInputChannelPair(const String8& name, | |
| sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel) { | |
| int sockets[2]; | |
| if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets)) { | |
| status_t result = -errno; | |
| ALOGE("channel '%s' ~ Could not create socket pair. errno=%d", | |
| name.string(), errno); | |
| outServerChannel.clear(); | |
| outClientChannel.clear(); | |
| return result; | |
| } | |
| int bufferSize = SOCKET_BUFFER_SIZE; | |
| setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); | |
| setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); | |
| setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize)); | |
| setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize)); | |
| String8 serverChannelName = name; | |
| serverChannelName.append(" (server)"); | |
| outServerChannel = new InputChannel(serverChannelName, sockets[0]); | |
| String8 clientChannelName = name; | |
| clientChannelName.append(" (client)"); | |
| outClientChannel = new InputChannel(clientChannelName, sockets[1]); | |
| return OK; | |
| } | |
| status_t InputChannel::sendMessage(const InputMessage* msg) { | |
| size_t msgLength = msg->size(); | |
| ssize_t nWrite; | |
| do { | |
| nWrite = ::send(mFd, msg, msgLength, MSG_DONTWAIT | MSG_NOSIGNAL); | |
| } while (nWrite == -1 && errno == EINTR); | |
| if (nWrite < 0) { | |
| int error = errno; | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ error sending message of type %d, errno=%d", mName.string(), | |
| msg->header.type, error); | |
| #endif | |
| if (error == EAGAIN || error == EWOULDBLOCK) { | |
| return WOULD_BLOCK; | |
| } | |
| if (error == EPIPE || error == ENOTCONN || error == ECONNREFUSED || error == ECONNRESET) { | |
| return DEAD_OBJECT; | |
| } | |
| return -error; | |
| } | |
| if (size_t(nWrite) != msgLength) { | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ error sending message type %d, send was incomplete", | |
| mName.string(), msg->header.type); | |
| #endif | |
| return DEAD_OBJECT; | |
| } | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ sent message of type %d", mName.string(), msg->header.type); | |
| #endif | |
| return OK; | |
| } | |
| status_t InputChannel::receiveMessage(InputMessage* msg) { | |
| ssize_t nRead; | |
| do { | |
| nRead = ::recv(mFd, msg, sizeof(InputMessage), MSG_DONTWAIT); | |
| } while (nRead == -1 && errno == EINTR); | |
| if (nRead < 0) { | |
| int error = errno; | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ receive message failed, errno=%d", mName.string(), errno); | |
| #endif | |
| if (error == EAGAIN || error == EWOULDBLOCK) { | |
| return WOULD_BLOCK; | |
| } | |
| if (error == EPIPE || error == ENOTCONN || error == ECONNREFUSED) { | |
| return DEAD_OBJECT; | |
| } | |
| return -error; | |
| } | |
| if (nRead == 0) { // check for EOF | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ receive message failed because peer was closed", mName.string()); | |
| #endif | |
| return DEAD_OBJECT; | |
| } | |
| if (!msg->isValid(nRead)) { | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ received invalid message", mName.string()); | |
| #endif | |
| return BAD_VALUE; | |
| } | |
| #if DEBUG_CHANNEL_MESSAGES | |
| ALOGD("channel '%s' ~ received message of type %d", mName.string(), msg->header.type); | |
| #endif | |
| return OK; | |
| } | |
| sp<InputChannel> InputChannel::dup() const { | |
| int fd = ::dup(getFd()); | |
| return fd >= 0 ? new InputChannel(getName(), fd) : NULL; | |
| } | |
| // --- InputPublisher --- | |
| InputPublisher::InputPublisher(const sp<InputChannel>& channel) : | |
| mChannel(channel) { | |
| } | |
| InputPublisher::~InputPublisher() { | |
| } | |
| status_t InputPublisher::publishKeyEvent( | |
| uint32_t seq, | |
| int32_t deviceId, | |
| int32_t source, | |
| int32_t action, | |
| int32_t flags, | |
| int32_t keyCode, | |
| int32_t scanCode, | |
| int32_t metaState, | |
| int32_t repeatCount, | |
| nsecs_t downTime, | |
| nsecs_t eventTime) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' publisher ~ publishKeyEvent: seq=%u, deviceId=%d, source=0x%x, " | |
| "action=0x%x, flags=0x%x, keyCode=%d, scanCode=%d, metaState=0x%x, repeatCount=%d," | |
| "downTime=%lld, eventTime=%lld", | |
| mChannel->getName().string(), seq, | |
| deviceId, source, action, flags, keyCode, scanCode, metaState, repeatCount, | |
| downTime, eventTime); | |
| #endif | |
| if (!seq) { | |
| ALOGE("Attempted to publish a key event with sequence number 0."); | |
| return BAD_VALUE; | |
| } | |
| InputMessage msg; | |
| msg.header.type = InputMessage::TYPE_KEY; | |
| msg.body.key.seq = seq; | |
| msg.body.key.deviceId = deviceId; | |
| msg.body.key.source = source; | |
| msg.body.key.action = action; | |
| msg.body.key.flags = flags; | |
| msg.body.key.keyCode = keyCode; | |
| msg.body.key.scanCode = scanCode; | |
| msg.body.key.metaState = metaState; | |
| msg.body.key.repeatCount = repeatCount; | |
| msg.body.key.downTime = downTime; | |
| msg.body.key.eventTime = eventTime; | |
| return mChannel->sendMessage(&msg); | |
| } | |
| status_t InputPublisher::publishMotionEvent( | |
| uint32_t seq, | |
| int32_t deviceId, | |
| int32_t source, | |
| int32_t action, | |
| int32_t actionButton, | |
| int32_t flags, | |
| int32_t edgeFlags, | |
| int32_t metaState, | |
| int32_t buttonState, | |
| float xOffset, | |
| float yOffset, | |
| float xPrecision, | |
| float yPrecision, | |
| nsecs_t downTime, | |
| nsecs_t eventTime, | |
| uint32_t pointerCount, | |
| const PointerProperties* pointerProperties, | |
| const PointerCoords* pointerCoords) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, " | |
| "action=0x%x, actionButton=0x%08x, flags=0x%x, edgeFlags=0x%x, " | |
| "metaState=0x%x, buttonState=0x%x, xOffset=%f, yOffset=%f, " | |
| "xPrecision=%f, yPrecision=%f, downTime=%lld, eventTime=%lld, " | |
| "pointerCount=%" PRIu32, | |
| mChannel->getName().string(), seq, | |
| deviceId, source, action, actionButton, flags, edgeFlags, metaState, buttonState, | |
| xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount); | |
| #endif | |
| if (!seq) { | |
| ALOGE("Attempted to publish a motion event with sequence number 0."); | |
| return BAD_VALUE; | |
| } | |
| if (pointerCount > MAX_POINTERS || pointerCount < 1) { | |
| ALOGE("channel '%s' publisher ~ Invalid number of pointers provided: %" PRIu32 ".", | |
| mChannel->getName().string(), pointerCount); | |
| return BAD_VALUE; | |
| } | |
| InputMessage msg; | |
| msg.header.type = InputMessage::TYPE_MOTION; | |
| msg.body.motion.seq = seq; | |
| msg.body.motion.deviceId = deviceId; | |
| msg.body.motion.source = source; | |
| msg.body.motion.action = action; | |
| msg.body.motion.actionButton = actionButton; | |
| msg.body.motion.flags = flags; | |
| msg.body.motion.edgeFlags = edgeFlags; | |
| msg.body.motion.metaState = metaState; | |
| msg.body.motion.buttonState = buttonState; | |
| msg.body.motion.xOffset = xOffset; | |
| msg.body.motion.yOffset = yOffset; | |
| msg.body.motion.xPrecision = xPrecision; | |
| msg.body.motion.yPrecision = yPrecision; | |
| msg.body.motion.downTime = downTime; | |
| msg.body.motion.eventTime = eventTime; | |
| msg.body.motion.pointerCount = pointerCount; | |
| for (uint32_t i = 0; i < pointerCount; i++) { | |
| msg.body.motion.pointers[i].properties.copyFrom(pointerProperties[i]); | |
| msg.body.motion.pointers[i].coords.copyFrom(pointerCoords[i]); | |
| } | |
| return mChannel->sendMessage(&msg); | |
| } | |
| status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' publisher ~ receiveFinishedSignal", | |
| mChannel->getName().string()); | |
| #endif | |
| InputMessage msg; | |
| status_t result = mChannel->receiveMessage(&msg); | |
| if (result) { | |
| *outSeq = 0; | |
| *outHandled = false; | |
| return result; | |
| } | |
| if (msg.header.type != InputMessage::TYPE_FINISHED) { | |
| ALOGE("channel '%s' publisher ~ Received unexpected message of type %d from consumer", | |
| mChannel->getName().string(), msg.header.type); | |
| return UNKNOWN_ERROR; | |
| } | |
| *outSeq = msg.body.finished.seq; | |
| *outHandled = msg.body.finished.handled; | |
| return OK; | |
| } | |
| // --- InputConsumer --- | |
| InputConsumer::InputConsumer(const sp<InputChannel>& channel) : | |
| mResampleTouch(isTouchResamplingEnabled()), | |
| mChannel(channel), mMsgDeferred(false) { | |
| } | |
| InputConsumer::~InputConsumer() { | |
| } | |
| bool InputConsumer::isTouchResamplingEnabled() { | |
| char value[PROPERTY_VALUE_MAX]; | |
| int length = property_get("ro.input.noresample", value, NULL); | |
| if (length > 0) { | |
| if (!strcmp("1", value)) { | |
| return false; | |
| } | |
| if (strcmp("0", value)) { | |
| ALOGD("Unrecognized property value for 'ro.input.noresample'. " | |
| "Use '1' or '0'."); | |
| } | |
| } | |
| return true; | |
| } | |
| status_t InputConsumer::consume(InputEventFactoryInterface* factory, | |
| bool consumeBatches, nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%lld", | |
| mChannel->getName().string(), consumeBatches ? "true" : "false", frameTime); | |
| #endif | |
| *outSeq = 0; | |
| *outEvent = NULL; | |
| // Fetch the next input message. | |
| // Loop until an event can be returned or no additional events are received. | |
| while (!*outEvent) { | |
| if (mMsgDeferred) { | |
| // mMsg contains a valid input message from the previous call to consume | |
| // that has not yet been processed. | |
| mMsgDeferred = false; | |
| } else { | |
| // Receive a fresh message. | |
| status_t result = mChannel->receiveMessage(&mMsg); | |
| if (result) { | |
| // Consume the next batched event unless batches are being held for later. | |
| if (consumeBatches || result != WOULD_BLOCK) { | |
| result = consumeBatch(factory, frameTime, outSeq, outEvent); | |
| if (*outEvent) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ consumed batch event, seq=%u", | |
| mChannel->getName().string(), *outSeq); | |
| #endif | |
| break; | |
| } | |
| } | |
| return result; | |
| } | |
| } | |
| switch (mMsg.header.type) { | |
| case InputMessage::TYPE_KEY: { | |
| KeyEvent* keyEvent = factory->createKeyEvent(); | |
| if (!keyEvent) return NO_MEMORY; | |
| initializeKeyEvent(keyEvent, &mMsg); | |
| *outSeq = mMsg.body.key.seq; | |
| *outEvent = keyEvent; | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ consumed key event, seq=%u", | |
| mChannel->getName().string(), *outSeq); | |
| #endif | |
| break; | |
| } | |
| case AINPUT_EVENT_TYPE_MOTION: { | |
| ssize_t batchIndex = findBatch(mMsg.body.motion.deviceId, mMsg.body.motion.source); | |
| if (batchIndex >= 0) { | |
| Batch& batch = mBatches.editItemAt(batchIndex); | |
| if (canAddSample(batch, &mMsg)) { | |
| batch.samples.push(mMsg); | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ appended to batch event", | |
| mChannel->getName().string()); | |
| #endif | |
| break; | |
| } else { | |
| // We cannot append to the batch in progress, so we need to consume | |
| // the previous batch right now and defer the new message until later. | |
| mMsgDeferred = true; | |
| status_t result = consumeSamples(factory, | |
| batch, batch.samples.size(), outSeq, outEvent); | |
| mBatches.removeAt(batchIndex); | |
| if (result) { | |
| return result; | |
| } | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ consumed batch event and " | |
| "deferred current event, seq=%u", | |
| mChannel->getName().string(), *outSeq); | |
| #endif | |
| break; | |
| } | |
| } | |
| // Start a new batch if needed. | |
| if (mMsg.body.motion.action == AMOTION_EVENT_ACTION_MOVE | |
| || mMsg.body.motion.action == AMOTION_EVENT_ACTION_HOVER_MOVE) { | |
| mBatches.push(); | |
| Batch& batch = mBatches.editTop(); | |
| batch.samples.push(mMsg); | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ started batch event", | |
| mChannel->getName().string()); | |
| #endif | |
| break; | |
| } | |
| MotionEvent* motionEvent = factory->createMotionEvent(); | |
| if (! motionEvent) return NO_MEMORY; | |
| updateTouchState(&mMsg); | |
| initializeMotionEvent(motionEvent, &mMsg); | |
| *outSeq = mMsg.body.motion.seq; | |
| *outEvent = motionEvent; | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ consumed motion event, seq=%u", | |
| mChannel->getName().string(), *outSeq); | |
| #endif | |
| break; | |
| } | |
| default: | |
| ALOGE("channel '%s' consumer ~ Received unexpected message of type %d", | |
| mChannel->getName().string(), mMsg.header.type); | |
| return UNKNOWN_ERROR; | |
| } | |
| } | |
| return OK; | |
| } | |
| status_t InputConsumer::consumeBatch(InputEventFactoryInterface* factory, | |
| nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) { | |
| status_t result; | |
| for (size_t i = mBatches.size(); i > 0; ) { | |
| i--; | |
| Batch& batch = mBatches.editItemAt(i); | |
| if (frameTime < 0) { | |
| result = consumeSamples(factory, batch, batch.samples.size(), | |
| outSeq, outEvent); | |
| mBatches.removeAt(i); | |
| return result; | |
| } | |
| nsecs_t sampleTime = frameTime; | |
| if (mResampleTouch) { | |
| sampleTime -= RESAMPLE_LATENCY; | |
| } | |
| ssize_t split = findSampleNoLaterThan(batch, sampleTime); | |
| if (split < 0) { | |
| continue; | |
| } | |
| result = consumeSamples(factory, batch, split + 1, outSeq, outEvent); | |
| const InputMessage* next; | |
| if (batch.samples.isEmpty()) { | |
| mBatches.removeAt(i); | |
| next = NULL; | |
| } else { | |
| next = &batch.samples.itemAt(0); | |
| } | |
| if (!result && mResampleTouch) { | |
| resampleTouchState(sampleTime, static_cast<MotionEvent*>(*outEvent), next); | |
| } | |
| return result; | |
| } | |
| return WOULD_BLOCK; | |
| } | |
| status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory, | |
| Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent) { | |
| MotionEvent* motionEvent = factory->createMotionEvent(); | |
| if (! motionEvent) return NO_MEMORY; | |
| uint32_t chain = 0; | |
| for (size_t i = 0; i < count; i++) { | |
| InputMessage& msg = batch.samples.editItemAt(i); | |
| updateTouchState(&msg); | |
| if (i) { | |
| SeqChain seqChain; | |
| seqChain.seq = msg.body.motion.seq; | |
| seqChain.chain = chain; | |
| mSeqChains.push(seqChain); | |
| addSample(motionEvent, &msg); | |
| } else { | |
| initializeMotionEvent(motionEvent, &msg); | |
| } | |
| chain = msg.body.motion.seq; | |
| } | |
| batch.samples.removeItemsAt(0, count); | |
| *outSeq = chain; | |
| *outEvent = motionEvent; | |
| return OK; | |
| } | |
| void InputConsumer::updateTouchState(InputMessage* msg) { | |
| if (!mResampleTouch || | |
| !(msg->body.motion.source & AINPUT_SOURCE_CLASS_POINTER)) { | |
| return; | |
| } | |
| int32_t deviceId = msg->body.motion.deviceId; | |
| int32_t source = msg->body.motion.source; | |
| nsecs_t eventTime = msg->body.motion.eventTime; | |
| // Update the touch state history to incorporate the new input message. | |
| // If the message is in the past relative to the most recently produced resampled | |
| // touch, then use the resampled time and coordinates instead. | |
| switch (msg->body.motion.action & AMOTION_EVENT_ACTION_MASK) { | |
| case AMOTION_EVENT_ACTION_DOWN: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index < 0) { | |
| mTouchStates.push(); | |
| index = mTouchStates.size() - 1; | |
| } | |
| TouchState& touchState = mTouchStates.editItemAt(index); | |
| touchState.initialize(deviceId, source); | |
| touchState.addHistory(msg); | |
| break; | |
| } | |
| case AMOTION_EVENT_ACTION_MOVE: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index >= 0) { | |
| TouchState& touchState = mTouchStates.editItemAt(index); | |
| touchState.addHistory(msg); | |
| if (eventTime < touchState.lastResample.eventTime) { | |
| rewriteMessage(touchState, msg); | |
| } else { | |
| touchState.lastResample.idBits.clear(); | |
| } | |
| } | |
| break; | |
| } | |
| case AMOTION_EVENT_ACTION_POINTER_DOWN: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index >= 0) { | |
| TouchState& touchState = mTouchStates.editItemAt(index); | |
| touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); | |
| rewriteMessage(touchState, msg); | |
| } | |
| break; | |
| } | |
| case AMOTION_EVENT_ACTION_POINTER_UP: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index >= 0) { | |
| TouchState& touchState = mTouchStates.editItemAt(index); | |
| rewriteMessage(touchState, msg); | |
| touchState.lastResample.idBits.clearBit(msg->body.motion.getActionId()); | |
| } | |
| break; | |
| } | |
| case AMOTION_EVENT_ACTION_SCROLL: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index >= 0) { | |
| const TouchState& touchState = mTouchStates.itemAt(index); | |
| rewriteMessage(touchState, msg); | |
| } | |
| break; | |
| } | |
| case AMOTION_EVENT_ACTION_UP: | |
| case AMOTION_EVENT_ACTION_CANCEL: { | |
| ssize_t index = findTouchState(deviceId, source); | |
| if (index >= 0) { | |
| const TouchState& touchState = mTouchStates.itemAt(index); | |
| rewriteMessage(touchState, msg); | |
| mTouchStates.removeAt(index); | |
| } | |
| break; | |
| } | |
| } | |
| } | |
| void InputConsumer::rewriteMessage(const TouchState& state, InputMessage* msg) { | |
| for (uint32_t i = 0; i < msg->body.motion.pointerCount; i++) { | |
| uint32_t id = msg->body.motion.pointers[i].properties.id; | |
| if (state.lastResample.idBits.hasBit(id)) { | |
| PointerCoords& msgCoords = msg->body.motion.pointers[i].coords; | |
| const PointerCoords& resampleCoords = state.lastResample.getPointerById(id); | |
| #if DEBUG_RESAMPLING | |
| ALOGD("[%d] - rewrite (%0.3f, %0.3f), old (%0.3f, %0.3f)", id, | |
| resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_X), | |
| resampleCoords.getAxisValue(AMOTION_EVENT_AXIS_Y), | |
| msgCoords.getAxisValue(AMOTION_EVENT_AXIS_X), | |
| msgCoords.getAxisValue(AMOTION_EVENT_AXIS_Y)); | |
| #endif | |
| msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX()); | |
| msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY()); | |
| } | |
| } | |
| } | |
| void InputConsumer::resampleTouchState(nsecs_t sampleTime, MotionEvent* event, | |
| const InputMessage* next) { | |
| if (!mResampleTouch | |
| || !(event->getSource() & AINPUT_SOURCE_CLASS_POINTER) | |
| || event->getAction() != AMOTION_EVENT_ACTION_MOVE) { | |
| return; | |
| } | |
| ssize_t index = findTouchState(event->getDeviceId(), event->getSource()); | |
| if (index < 0) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, no touch state for device."); | |
| #endif | |
| return; | |
| } | |
| TouchState& touchState = mTouchStates.editItemAt(index); | |
| if (touchState.historySize < 1) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, no history for device."); | |
| #endif | |
| return; | |
| } | |
| // Ensure that the current sample has all of the pointers that need to be reported. | |
| const History* current = touchState.getHistory(0); | |
| size_t pointerCount = event->getPointerCount(); | |
| for (size_t i = 0; i < pointerCount; i++) { | |
| uint32_t id = event->getPointerId(i); | |
| if (!current->idBits.hasBit(id)) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, missing id %d", id); | |
| #endif | |
| return; | |
| } | |
| } | |
| // Find the data to use for resampling. | |
| const History* other; | |
| History future; | |
| float alpha; | |
| if (next) { | |
| // Interpolate between current sample and future sample. | |
| // So current->eventTime <= sampleTime <= future.eventTime. | |
| future.initializeFrom(next); | |
| other = &future; | |
| nsecs_t delta = future.eventTime - current->eventTime; | |
| if (delta < RESAMPLE_MIN_DELTA) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, delta time is too small: %lld ns.", delta); | |
| #endif | |
| return; | |
| } | |
| alpha = float(sampleTime - current->eventTime) / delta; | |
| } else if (touchState.historySize >= 2) { | |
| // Extrapolate future sample using current sample and past sample. | |
| // So other->eventTime <= current->eventTime <= sampleTime. | |
| other = touchState.getHistory(1); | |
| nsecs_t delta = current->eventTime - other->eventTime; | |
| if (delta < RESAMPLE_MIN_DELTA) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, delta time is too small: %lld ns.", delta); | |
| #endif | |
| return; | |
| } else if (delta > RESAMPLE_MAX_DELTA) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, delta time is too large: %lld ns.", delta); | |
| #endif | |
| return; | |
| } | |
| nsecs_t maxPredict = current->eventTime + min(delta / 2, RESAMPLE_MAX_PREDICTION); | |
| if (sampleTime > maxPredict) { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Sample time is too far in the future, adjusting prediction " | |
| "from %lld to %lld ns.", | |
| sampleTime - current->eventTime, maxPredict - current->eventTime); | |
| #endif | |
| sampleTime = maxPredict; | |
| } | |
| alpha = float(current->eventTime - sampleTime) / delta; | |
| } else { | |
| #if DEBUG_RESAMPLING | |
| ALOGD("Not resampled, insufficient data."); | |
| #endif | |
| return; | |
| } | |
| // Resample touch coordinates. | |
| touchState.lastResample.eventTime = sampleTime; | |
| touchState.lastResample.idBits.clear(); | |
| for (size_t i = 0; i < pointerCount; i++) { | |
| uint32_t id = event->getPointerId(i); | |
| touchState.lastResample.idToIndex[id] = i; | |
| touchState.lastResample.idBits.markBit(id); | |
| PointerCoords& resampledCoords = touchState.lastResample.pointers[i]; | |
| const PointerCoords& currentCoords = current->getPointerById(id); | |
| if (other->idBits.hasBit(id) | |
| && shouldResampleTool(event->getToolType(i))) { | |
| const PointerCoords& otherCoords = other->getPointerById(id); | |
| resampledCoords.copyFrom(currentCoords); | |
| resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_X, | |
| lerp(currentCoords.getX(), otherCoords.getX(), alpha)); | |
| resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, | |
| lerp(currentCoords.getY(), otherCoords.getY(), alpha)); | |
| #if DEBUG_RESAMPLING | |
| ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f), " | |
| "other (%0.3f, %0.3f), alpha %0.3f", | |
| id, resampledCoords.getX(), resampledCoords.getY(), | |
| currentCoords.getX(), currentCoords.getY(), | |
| otherCoords.getX(), otherCoords.getY(), | |
| alpha); | |
| #endif | |
| } else { | |
| resampledCoords.copyFrom(currentCoords); | |
| #if DEBUG_RESAMPLING | |
| ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f)", | |
| id, resampledCoords.getX(), resampledCoords.getY(), | |
| currentCoords.getX(), currentCoords.getY()); | |
| #endif | |
| } | |
| } | |
| event->addSample(sampleTime, touchState.lastResample.pointers); | |
| } | |
| bool InputConsumer::shouldResampleTool(int32_t toolType) { | |
| return toolType == AMOTION_EVENT_TOOL_TYPE_FINGER | |
| || toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN; | |
| } | |
| status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) { | |
| #if DEBUG_TRANSPORT_ACTIONS | |
| ALOGD("channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s", | |
| mChannel->getName().string(), seq, handled ? "true" : "false"); | |
| #endif | |
| if (!seq) { | |
| ALOGE("Attempted to send a finished signal with sequence number 0."); | |
| return BAD_VALUE; | |
| } | |
| // Send finished signals for the batch sequence chain first. | |
| size_t seqChainCount = mSeqChains.size(); | |
| if (seqChainCount) { | |
| uint32_t currentSeq = seq; | |
| uint32_t chainSeqs[seqChainCount]; | |
| size_t chainIndex = 0; | |
| for (size_t i = seqChainCount; i > 0; ) { | |
| i--; | |
| const SeqChain& seqChain = mSeqChains.itemAt(i); | |
| if (seqChain.seq == currentSeq) { | |
| currentSeq = seqChain.chain; | |
| chainSeqs[chainIndex++] = currentSeq; | |
| mSeqChains.removeAt(i); | |
| } | |
| } | |
| status_t status = OK; | |
| while (!status && chainIndex > 0) { | |
| chainIndex--; | |
| status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled); | |
| } | |
| if (status) { | |
| // An error occurred so at least one signal was not sent, reconstruct the chain. | |
| do { | |
| SeqChain seqChain; | |
| seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq; | |
| seqChain.chain = chainSeqs[chainIndex]; | |
| mSeqChains.push(seqChain); | |
| if (chainIndex != 0) { | |
| chainIndex--; | |
| } | |
| } while (chainIndex > 0); | |
| return status; | |
| } | |
| } | |
| // Send finished signal for the last message in the batch. | |
| return sendUnchainedFinishedSignal(seq, handled); | |
| } | |
| status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) { | |
| InputMessage msg; | |
| msg.header.type = InputMessage::TYPE_FINISHED; | |
| msg.body.finished.seq = seq; | |
| msg.body.finished.handled = handled; | |
| return mChannel->sendMessage(&msg); | |
| } | |
| bool InputConsumer::hasDeferredEvent() const { | |
| return mMsgDeferred; | |
| } | |
| bool InputConsumer::hasPendingBatch() const { | |
| return !mBatches.isEmpty(); | |
| } | |
| ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const { | |
| for (size_t i = 0; i < mBatches.size(); i++) { | |
| const Batch& batch = mBatches.itemAt(i); | |
| const InputMessage& head = batch.samples.itemAt(0); | |
| if (head.body.motion.deviceId == deviceId && head.body.motion.source == source) { | |
| return i; | |
| } | |
| } | |
| return -1; | |
| } | |
| ssize_t InputConsumer::findTouchState(int32_t deviceId, int32_t source) const { | |
| for (size_t i = 0; i < mTouchStates.size(); i++) { | |
| const TouchState& touchState = mTouchStates.itemAt(i); | |
| if (touchState.deviceId == deviceId && touchState.source == source) { | |
| return i; | |
| } | |
| } | |
| return -1; | |
| } | |
| void InputConsumer::initializeKeyEvent(KeyEvent* event, const InputMessage* msg) { | |
| event->initialize( | |
| msg->body.key.deviceId, | |
| msg->body.key.source, | |
| msg->body.key.action, | |
| msg->body.key.flags, | |
| msg->body.key.keyCode, | |
| msg->body.key.scanCode, | |
| msg->body.key.metaState, | |
| msg->body.key.repeatCount, | |
| msg->body.key.downTime, | |
| msg->body.key.eventTime); | |
| } | |
| void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) { | |
| uint32_t pointerCount = msg->body.motion.pointerCount; | |
| PointerProperties pointerProperties[pointerCount]; | |
| PointerCoords pointerCoords[pointerCount]; | |
| for (uint32_t i = 0; i < pointerCount; i++) { | |
| pointerProperties[i].copyFrom(msg->body.motion.pointers[i].properties); | |
| pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); | |
| } | |
| event->initialize( | |
| msg->body.motion.deviceId, | |
| msg->body.motion.source, | |
| msg->body.motion.action, | |
| msg->body.motion.actionButton, | |
| msg->body.motion.flags, | |
| msg->body.motion.edgeFlags, | |
| msg->body.motion.metaState, | |
| msg->body.motion.buttonState, | |
| msg->body.motion.xOffset, | |
| msg->body.motion.yOffset, | |
| msg->body.motion.xPrecision, | |
| msg->body.motion.yPrecision, | |
| msg->body.motion.downTime, | |
| msg->body.motion.eventTime, | |
| pointerCount, | |
| pointerProperties, | |
| pointerCoords); | |
| } | |
| void InputConsumer::addSample(MotionEvent* event, const InputMessage* msg) { | |
| uint32_t pointerCount = msg->body.motion.pointerCount; | |
| PointerCoords pointerCoords[pointerCount]; | |
| for (uint32_t i = 0; i < pointerCount; i++) { | |
| pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords); | |
| } | |
| event->setMetaState(event->getMetaState() | msg->body.motion.metaState); | |
| event->addSample(msg->body.motion.eventTime, pointerCoords); | |
| } | |
| bool InputConsumer::canAddSample(const Batch& batch, const InputMessage *msg) { | |
| const InputMessage& head = batch.samples.itemAt(0); | |
| uint32_t pointerCount = msg->body.motion.pointerCount; | |
| if (head.body.motion.pointerCount != pointerCount | |
| || head.body.motion.action != msg->body.motion.action) { | |
| return false; | |
| } | |
| for (size_t i = 0; i < pointerCount; i++) { | |
| if (head.body.motion.pointers[i].properties | |
| != msg->body.motion.pointers[i].properties) { | |
| return false; | |
| } | |
| } | |
| return true; | |
| } | |
| ssize_t InputConsumer::findSampleNoLaterThan(const Batch& batch, nsecs_t time) { | |
| size_t numSamples = batch.samples.size(); | |
| size_t index = 0; | |
| while (index < numSamples | |
| && batch.samples.itemAt(index).body.motion.eventTime <= time) { | |
| index += 1; | |
| } | |
| return ssize_t(index) - 1; | |
| } | |
| } // namespace android |