| // |
| // 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 displayId, |
| 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.displayId = displayId; |
| 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, |
| int32_t* displayId) { |
| #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; |
| *displayId = -1; // Invalid display. |
| |
| // 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, displayId); |
| 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, displayId); |
| 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; |
| *displayId = mMsg.body.motion.displayId; |
| #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, int32_t* displayId) { |
| 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, displayId); |
| 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, displayId); |
| 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, int32_t* displayId) { |
| 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 { |
| *displayId = msg.body.motion.displayId; |
| 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; |
| |
| // 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); |
| rewriteMessage(touchState, msg); |
| } |
| 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) { |
| TouchState& touchState = mTouchStates.editItemAt(index); |
| rewriteMessage(touchState, msg); |
| } |
| break; |
| } |
| |
| case AMOTION_EVENT_ACTION_UP: |
| case AMOTION_EVENT_ACTION_CANCEL: { |
| ssize_t index = findTouchState(deviceId, source); |
| if (index >= 0) { |
| TouchState& touchState = mTouchStates.editItemAt(index); |
| rewriteMessage(touchState, msg); |
| mTouchStates.removeAt(index); |
| } |
| break; |
| } |
| } |
| } |
| |
| /** |
| * Replace the coordinates in msg with the coordinates in lastResample, if necessary. |
| * |
| * If lastResample is no longer valid for a specific pointer (i.e. the lastResample time |
| * is in the past relative to msg and the past two events do not contain identical coordinates), |
| * then invalidate the lastResample data for that pointer. |
| * If the two past events have identical coordinates, then lastResample data for that pointer will |
| * remain valid, and will be used to replace these coordinates. Thus, if a certain coordinate x0 is |
| * resampled to the new value x1, then x1 will always be used to replace x0 until some new value |
| * not equal to x0 is received. |
| */ |
| void InputConsumer::rewriteMessage(TouchState& state, InputMessage& msg) { |
| nsecs_t eventTime = msg.body.motion.eventTime; |
| 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)) { |
| if (eventTime < state.lastResample.eventTime || |
| state.recentCoordinatesAreIdentical(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.getX(), resampleCoords.getY(), |
| msgCoords.getX(), msgCoords.getY()); |
| #endif |
| msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX()); |
| msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY()); |
| } else { |
| state.lastResample.idBits.clearBit(id); |
| } |
| } |
| } |
| } |
| |
| 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: %" PRId64 " 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: %" PRId64 " ns.", delta); |
| #endif |
| return; |
| } else if (delta > RESAMPLE_MAX_DELTA) { |
| #if DEBUG_RESAMPLING |
| ALOGD("Not resampled, delta time is too large: %" PRId64 " 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 %" PRId64 " to %" PRId64 " 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. |
| History oldLastResample; |
| oldLastResample.initializeFrom(touchState.lastResample); |
| 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); |
| if (oldLastResample.hasPointerId(id) && touchState.recentCoordinatesAreIdentical(id)) { |
| // We maintain the previously resampled value for this pointer (stored in |
| // oldLastResample) when the coordinates for this pointer haven't changed since then. |
| // This way we don't introduce artificial jitter when pointers haven't actually moved. |
| |
| // We know here that the coordinates for the pointer haven't changed because we |
| // would've cleared the resampled bit in rewriteMessage if they had. We can't modify |
| // lastResample in place becasue the mapping from pointer ID to index may have changed. |
| touchState.lastResample.pointers[i].copyFrom(oldLastResample.getPointerById(id)); |
| continue; |
| } |
| |
| PointerCoords& resampledCoords = touchState.lastResample.pointers[i]; |
| const PointerCoords& currentCoords = current->getPointerById(id); |
| resampledCoords.copyFrom(currentCoords); |
| if (other->idBits.hasBit(id) |
| && shouldResampleTool(event->getToolType(i))) { |
| const PointerCoords& otherCoords = other->getPointerById(id); |
| 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 { |
| #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. |
| for (;;) { |
| SeqChain seqChain; |
| seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq; |
| seqChain.chain = chainSeqs[chainIndex]; |
| mSeqChains.push(seqChain); |
| if (!chainIndex) break; |
| chainIndex--; |
| } |
| 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 |
