The Tor Browser: widget/gonk/libui/InputTransport.cpp@fc2d59ddac77 (annotated)

widget/gonk/libui/InputTransport.cpp@fc2d59ddac77 (annotated)

widget/gonk/libui/InputTransport.cpp

Wed, 31 Dec 2014 07:22:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:22:50 +0100
branch: TOR_BUG_3246
changeset 4: fc2d59ddac77
permissions: -rw-r--r--

Correct previous dual key logic pending first delivery installment.

 //
 // 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

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widget/gonk/libui/InputTransport.cpp@fc2d59ddac77 (annotated)

widget/gonk/libui/InputTransport.cpp