Move input library code from frameworks/base.
Change-Id: I4983db61b53e28479fc90d9211fafff68f7f49a6
diff --git a/libs/input/InputTransport.cpp b/libs/input/InputTransport.cpp
new file mode 100644
index 0000000..d6507f4
--- /dev/null
+++ b/libs/input/InputTransport.cpp
@@ -0,0 +1,958 @@
+//
+// 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 <math.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include <cutils/log.h>
+#include <cutils/properties.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 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 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