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Diffstat (limited to 'widget/gonk/libui/InputTransport.cpp')
| -rw-r--r-- | widget/gonk/libui/InputTransport.cpp | 957 |
1 files changed, 957 insertions, 0 deletions
diff --git a/widget/gonk/libui/InputTransport.cpp b/widget/gonk/libui/InputTransport.cpp new file mode 100644 index 000000000..3f0fcb047 --- /dev/null +++ b/widget/gonk/libui/InputTransport.cpp @@ -0,0 +1,957 @@ +// +// 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 "cutils_log.h" +#include <cutils/properties.h> +#include <errno.h> +#include <fcntl.h> +#include "InputTransport.h" +#include <unistd.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <math.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 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) { + 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) { + 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 flags, + int32_t edgeFlags, + int32_t metaState, + int32_t buttonState, + float xOffset, + float yOffset, + float xPrecision, + float yPrecision, + nsecs_t downTime, + nsecs_t eventTime, + size_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, 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=%d", + mChannel->getName().string(), seq, + deviceId, source, action, 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: %d.", + 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.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 (size_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("debug.inputconsumer.resample", value, NULL); + if (length > 0) { + if (!strcmp("0", value)) { + return false; + } + if (strcmp("1", value)) { + ALOGD("Unrecognized property value for 'debug.inputconsumer.resample'. " + "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; ) { + 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 - 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) { + 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 (size_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 %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 %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; ) { + 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) { + 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); + } 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) { + size_t pointerCount = msg->body.motion.pointerCount; + PointerProperties pointerProperties[pointerCount]; + PointerCoords pointerCoords[pointerCount]; + for (size_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.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) { + size_t pointerCount = msg->body.motion.pointerCount; + PointerCoords pointerCoords[pointerCount]; + for (size_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); + size_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 |