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diff --git a/libs/input/InputConsumer.cpp b/libs/input/InputConsumer.cpp
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+/**
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "InputTransport"
+#define ATRACE_TAG ATRACE_TAG_INPUT
+
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <math.h>
+#include <poll.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <android-base/logging.h>
+#include <android-base/properties.h>
+#include <android-base/stringprintf.h>
+#include <binder/Parcel.h>
+#include <cutils/properties.h>
+#include <ftl/enum.h>
+#include <log/log.h>
+#include <utils/Trace.h>
+
+#include <com_android_input_flags.h>
+#include <input/InputConsumer.h>
+#include <input/PrintTools.h>
+#include <input/TraceTools.h>
+
+namespace input_flags = com::android::input::flags;
+
+namespace android {
+
+namespace {
+
+/**
+ * Log debug messages relating to the consumer end of the transport channel.
+ * Enable this via "adb shell setprop log.tag.InputTransportConsumer DEBUG" (requires restart)
+ */
+
+const bool DEBUG_TRANSPORT_CONSUMER =
+ __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "Consumer", ANDROID_LOG_INFO);
+
+const bool IS_DEBUGGABLE_BUILD =
+#if defined(__ANDROID__)
+ android::base::GetBoolProperty("ro.debuggable", false);
+#else
+ true;
+#endif
+
+/**
+ * Log debug messages about touch event resampling.
+ *
+ * Enable this via "adb shell setprop log.tag.InputTransportResampling DEBUG".
+ * This requires a restart on non-debuggable (e.g. user) builds, but should take effect immediately
+ * on debuggable builds (e.g. userdebug).
+ */
+bool debugResampling() {
+ if (!IS_DEBUGGABLE_BUILD) {
+ static const bool DEBUG_TRANSPORT_RESAMPLING =
+ __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "Resampling",
+ ANDROID_LOG_INFO);
+ return DEBUG_TRANSPORT_RESAMPLING;
+ }
+ return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "Resampling", ANDROID_LOG_INFO);
+}
+
+void initializeKeyEvent(KeyEvent& event, const InputMessage& msg) {
+ event.initialize(msg.body.key.eventId, msg.body.key.deviceId, msg.body.key.source,
+ msg.body.key.displayId, msg.body.key.hmac, 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 initializeFocusEvent(FocusEvent& event, const InputMessage& msg) {
+ event.initialize(msg.body.focus.eventId, msg.body.focus.hasFocus);
+}
+
+void initializeCaptureEvent(CaptureEvent& event, const InputMessage& msg) {
+ event.initialize(msg.body.capture.eventId, msg.body.capture.pointerCaptureEnabled);
+}
+
+void initializeDragEvent(DragEvent& event, const InputMessage& msg) {
+ event.initialize(msg.body.drag.eventId, msg.body.drag.x, msg.body.drag.y,
+ msg.body.drag.isExiting);
+}
+
+void initializeMotionEvent(MotionEvent& event, const InputMessage& msg) {
+ uint32_t pointerCount = msg.body.motion.pointerCount;
+ PointerProperties pointerProperties[pointerCount];
+ PointerCoords pointerCoords[pointerCount];
+ for (uint32_t i = 0; i < pointerCount; i++) {
+ pointerProperties[i] = msg.body.motion.pointers[i].properties;
+ pointerCoords[i] = msg.body.motion.pointers[i].coords;
+ }
+
+ ui::Transform transform;
+ transform.set({msg.body.motion.dsdx, msg.body.motion.dtdx, msg.body.motion.tx,
+ msg.body.motion.dtdy, msg.body.motion.dsdy, msg.body.motion.ty, 0, 0, 1});
+ ui::Transform displayTransform;
+ displayTransform.set({msg.body.motion.dsdxRaw, msg.body.motion.dtdxRaw, msg.body.motion.txRaw,
+ msg.body.motion.dtdyRaw, msg.body.motion.dsdyRaw, msg.body.motion.tyRaw,
+ 0, 0, 1});
+ event.initialize(msg.body.motion.eventId, msg.body.motion.deviceId, msg.body.motion.source,
+ msg.body.motion.displayId, msg.body.motion.hmac, msg.body.motion.action,
+ msg.body.motion.actionButton, msg.body.motion.flags, msg.body.motion.edgeFlags,
+ msg.body.motion.metaState, msg.body.motion.buttonState,
+ msg.body.motion.classification, transform, msg.body.motion.xPrecision,
+ msg.body.motion.yPrecision, msg.body.motion.xCursorPosition,
+ msg.body.motion.yCursorPosition, displayTransform, msg.body.motion.downTime,
+ msg.body.motion.eventTime, pointerCount, pointerProperties, pointerCoords);
+}
+
+void addSample(MotionEvent& event, const InputMessage& msg) {
+ uint32_t pointerCount = msg.body.motion.pointerCount;
+ PointerCoords pointerCoords[pointerCount];
+ for (uint32_t i = 0; i < pointerCount; i++) {
+ pointerCoords[i] = msg.body.motion.pointers[i].coords;
+ }
+
+ event.setMetaState(event.getMetaState() | msg.body.motion.metaState);
+ event.addSample(msg.body.motion.eventTime, pointerCoords);
+}
+
+void initializeTouchModeEvent(TouchModeEvent& event, const InputMessage& msg) {
+ event.initialize(msg.body.touchMode.eventId, msg.body.touchMode.isInTouchMode);
+}
+
+// Nanoseconds per milliseconds.
+constexpr 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.
+const std::chrono::duration RESAMPLE_LATENCY = 5ms;
+
+// Minimum time difference between consecutive samples before attempting to resample.
+const nsecs_t RESAMPLE_MIN_DELTA = 2 * NANOS_PER_MS;
+
+// Maximum time difference between consecutive samples before attempting to resample
+// by extrapolation.
+const nsecs_t RESAMPLE_MAX_DELTA = 20 * NANOS_PER_MS;
+
+// Maximum time to predict forward from the last known state, to avoid predicting too
+// far into the future. This time is further bounded by 50% of the last time delta.
+const nsecs_t RESAMPLE_MAX_PREDICTION = 8 * NANOS_PER_MS;
+
+/**
+ * System property for enabling / disabling touch resampling.
+ * Resampling extrapolates / interpolates the reported touch event coordinates to better
+ * align them to the VSYNC signal, thus resulting in smoother scrolling performance.
+ * Resampling is not needed (and should be disabled) on hardware that already
+ * has touch events triggered by VSYNC.
+ * Set to "1" to enable resampling (default).
+ * Set to "0" to disable resampling.
+ * Resampling is enabled by default.
+ */
+const char* PROPERTY_RESAMPLING_ENABLED = "ro.input.resampling";
+
+inline float lerp(float a, float b, float alpha) {
+ return a + alpha * (b - a);
+}
+
+inline bool isPointerEvent(int32_t source) {
+ return (source & AINPUT_SOURCE_CLASS_POINTER) == AINPUT_SOURCE_CLASS_POINTER;
+}
+
+bool shouldResampleTool(ToolType toolType) {
+ return toolType == ToolType::FINGER || toolType == ToolType::UNKNOWN;
+}
+
+} // namespace
+
+using android::base::Result;
+using android::base::StringPrintf;
+
+// --- InputConsumer ---
+
+InputConsumer::InputConsumer(const std::shared_ptr<InputChannel>& channel)
+ : InputConsumer(channel, isTouchResamplingEnabled()) {}
+
+InputConsumer::InputConsumer(const std::shared_ptr<InputChannel>& channel,
+ bool enableTouchResampling)
+ : mResampleTouch(enableTouchResampling), mChannel(channel), mMsgDeferred(false) {}
+
+InputConsumer::~InputConsumer() {}
+
+bool InputConsumer::isTouchResamplingEnabled() {
+ return property_get_bool(PROPERTY_RESAMPLING_ENABLED, true);
+}
+
+status_t InputConsumer::consume(InputEventFactoryInterface* factory, bool consumeBatches,
+ nsecs_t frameTime, uint32_t* outSeq, InputEvent** outEvent) {
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%" PRId64,
+ mChannel->getName().c_str(), toString(consumeBatches), frameTime);
+
+ *outSeq = 0;
+ *outEvent = nullptr;
+
+ // 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 == OK) {
+ const auto [_, inserted] =
+ mConsumeTimes.emplace(mMsg.header.seq, systemTime(SYSTEM_TIME_MONOTONIC));
+ LOG_ALWAYS_FATAL_IF(!inserted, "Already have a consume time for seq=%" PRIu32,
+ mMsg.header.seq);
+
+ // Trace the event processing timeline - event was just read from the socket
+ ATRACE_ASYNC_BEGIN("InputConsumer processing", /*cookie=*/mMsg.header.seq);
+ }
+ 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) {
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ consumed batch event, seq=%u",
+ mChannel->getName().c_str(), *outSeq);
+ 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.header.seq;
+ *outEvent = keyEvent;
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ consumed key event, seq=%u",
+ mChannel->getName().c_str(), *outSeq);
+ break;
+ }
+
+ case InputMessage::Type::MOTION: {
+ ssize_t batchIndex = findBatch(mMsg.body.motion.deviceId, mMsg.body.motion.source);
+ if (batchIndex >= 0) {
+ Batch& batch = mBatches[batchIndex];
+ if (canAddSample(batch, &mMsg)) {
+ batch.samples.push_back(mMsg);
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ appended to batch event",
+ mChannel->getName().c_str());
+ break;
+ } else if (isPointerEvent(mMsg.body.motion.source) &&
+ mMsg.body.motion.action == AMOTION_EVENT_ACTION_CANCEL) {
+ // No need to process events that we are going to cancel anyways
+ const size_t count = batch.samples.size();
+ for (size_t i = 0; i < count; i++) {
+ const InputMessage& msg = batch.samples[i];
+ sendFinishedSignal(msg.header.seq, false);
+ }
+ batch.samples.erase(batch.samples.begin(), batch.samples.begin() + count);
+ mBatches.erase(mBatches.begin() + batchIndex);
+ } 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.erase(mBatches.begin() + batchIndex);
+ if (result) {
+ return result;
+ }
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ consumed batch event and "
+ "deferred current event, seq=%u",
+ mChannel->getName().c_str(), *outSeq);
+ 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) {
+ Batch batch;
+ batch.samples.push_back(mMsg);
+ mBatches.push_back(batch);
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ started batch event",
+ mChannel->getName().c_str());
+ break;
+ }
+
+ MotionEvent* motionEvent = factory->createMotionEvent();
+ if (!motionEvent) return NO_MEMORY;
+
+ updateTouchState(mMsg);
+ initializeMotionEvent(*motionEvent, mMsg);
+ *outSeq = mMsg.header.seq;
+ *outEvent = motionEvent;
+
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ consumed motion event, seq=%u",
+ mChannel->getName().c_str(), *outSeq);
+ break;
+ }
+
+ case InputMessage::Type::FINISHED:
+ case InputMessage::Type::TIMELINE: {
+ LOG_ALWAYS_FATAL("Consumed a %s message, which should never be seen by "
+ "InputConsumer!",
+ ftl::enum_string(mMsg.header.type).c_str());
+ break;
+ }
+
+ case InputMessage::Type::FOCUS: {
+ FocusEvent* focusEvent = factory->createFocusEvent();
+ if (!focusEvent) return NO_MEMORY;
+
+ initializeFocusEvent(*focusEvent, mMsg);
+ *outSeq = mMsg.header.seq;
+ *outEvent = focusEvent;
+ break;
+ }
+
+ case InputMessage::Type::CAPTURE: {
+ CaptureEvent* captureEvent = factory->createCaptureEvent();
+ if (!captureEvent) return NO_MEMORY;
+
+ initializeCaptureEvent(*captureEvent, mMsg);
+ *outSeq = mMsg.header.seq;
+ *outEvent = captureEvent;
+ break;
+ }
+
+ case InputMessage::Type::DRAG: {
+ DragEvent* dragEvent = factory->createDragEvent();
+ if (!dragEvent) return NO_MEMORY;
+
+ initializeDragEvent(*dragEvent, mMsg);
+ *outSeq = mMsg.header.seq;
+ *outEvent = dragEvent;
+ break;
+ }
+
+ case InputMessage::Type::TOUCH_MODE: {
+ TouchModeEvent* touchModeEvent = factory->createTouchModeEvent();
+ if (!touchModeEvent) return NO_MEMORY;
+
+ initializeTouchModeEvent(*touchModeEvent, mMsg);
+ *outSeq = mMsg.header.seq;
+ *outEvent = touchModeEvent;
+ break;
+ }
+ }
+ }
+ return OK;
+}
+
+status_t InputConsumer::consumeBatch(InputEventFactoryInterface* factory, nsecs_t frameTime,
+ uint32_t* outSeq, InputEvent** outEvent) {
+ status_t result;
+ for (size_t i = mBatches.size(); i > 0;) {
+ i--;
+ Batch& batch = mBatches[i];
+ if (frameTime < 0) {
+ result = consumeSamples(factory, batch, batch.samples.size(), outSeq, outEvent);
+ mBatches.erase(mBatches.begin() + i);
+ return result;
+ }
+
+ nsecs_t sampleTime = frameTime;
+ if (mResampleTouch) {
+ sampleTime -= std::chrono::nanoseconds(RESAMPLE_LATENCY).count();
+ }
+ ssize_t split = findSampleNoLaterThan(batch, sampleTime);
+ if (split < 0) {
+ continue;
+ }
+
+ result = consumeSamples(factory, batch, split + 1, outSeq, outEvent);
+ const InputMessage* next;
+ if (batch.samples.empty()) {
+ mBatches.erase(mBatches.begin() + i);
+ next = nullptr;
+ } else {
+ next = &batch.samples[0];
+ }
+ if (!result && mResampleTouch) {
+ resampleTouchState(sampleTime, static_cast<MotionEvent*>(*outEvent), next);
+ }
+ return result;
+ }
+
+ return WOULD_BLOCK;
+}
+
+status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory, Batch& batch,
+ size_t count, uint32_t* outSeq, InputEvent** outEvent) {
+ MotionEvent* motionEvent = factory->createMotionEvent();
+ if (!motionEvent) return NO_MEMORY;
+
+ uint32_t chain = 0;
+ for (size_t i = 0; i < count; i++) {
+ InputMessage& msg = batch.samples[i];
+ updateTouchState(msg);
+ if (i) {
+ SeqChain seqChain;
+ seqChain.seq = msg.header.seq;
+ seqChain.chain = chain;
+ mSeqChains.push_back(seqChain);
+ addSample(*motionEvent, msg);
+ } else {
+ initializeMotionEvent(*motionEvent, msg);
+ }
+ chain = msg.header.seq;
+ }
+ batch.samples.erase(batch.samples.begin(), batch.samples.begin() + count);
+
+ *outSeq = chain;
+ *outEvent = motionEvent;
+ return OK;
+}
+
+void InputConsumer::updateTouchState(InputMessage& msg) {
+ if (!mResampleTouch || !isPointerEvent(msg.body.motion.source)) {
+ return;
+ }
+
+ int32_t deviceId = msg.body.motion.deviceId;
+ int32_t source = msg.body.motion.source;
+
+ // Update the touch state history to incorporate the new input message.
+ // If the message is in the past relative to the most recently produced resampled
+ // touch, then use the resampled time and coordinates instead.
+ switch (msg.body.motion.action & AMOTION_EVENT_ACTION_MASK) {
+ case AMOTION_EVENT_ACTION_DOWN: {
+ ssize_t index = findTouchState(deviceId, source);
+ if (index < 0) {
+ mTouchStates.push_back({});
+ index = mTouchStates.size() - 1;
+ }
+ TouchState& touchState = mTouchStates[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[index];
+ touchState.addHistory(msg);
+ rewriteMessage(touchState, msg);
+ }
+ break;
+ }
+
+ case AMOTION_EVENT_ACTION_POINTER_DOWN: {
+ ssize_t index = findTouchState(deviceId, source);
+ if (index >= 0) {
+ TouchState& touchState = mTouchStates[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[index];
+ rewriteMessage(touchState, msg);
+ touchState.lastResample.idBits.clearBit(msg.body.motion.getActionId());
+ }
+ break;
+ }
+
+ case AMOTION_EVENT_ACTION_SCROLL: {
+ ssize_t index = findTouchState(deviceId, source);
+ if (index >= 0) {
+ TouchState& touchState = mTouchStates[index];
+ rewriteMessage(touchState, msg);
+ }
+ break;
+ }
+
+ case AMOTION_EVENT_ACTION_UP:
+ case AMOTION_EVENT_ACTION_CANCEL: {
+ ssize_t index = findTouchState(deviceId, source);
+ if (index >= 0) {
+ TouchState& touchState = mTouchStates[index];
+ rewriteMessage(touchState, msg);
+ mTouchStates.erase(mTouchStates.begin() + index);
+ }
+ break;
+ }
+ }
+}
+
+/**
+ * Replace the coordinates in msg with the coordinates in lastResample, if necessary.
+ *
+ * If lastResample is no longer valid for a specific pointer (i.e. the lastResample time
+ * is in the past relative to msg and the past two events do not contain identical coordinates),
+ * then invalidate the lastResample data for that pointer.
+ * If the two past events have identical coordinates, then lastResample data for that pointer will
+ * remain valid, and will be used to replace these coordinates. Thus, if a certain coordinate x0 is
+ * resampled to the new value x1, then x1 will always be used to replace x0 until some new value
+ * not equal to x0 is received.
+ */
+void InputConsumer::rewriteMessage(TouchState& state, InputMessage& msg) {
+ nsecs_t eventTime = msg.body.motion.eventTime;
+ for (uint32_t i = 0; i < msg.body.motion.pointerCount; i++) {
+ uint32_t id = msg.body.motion.pointers[i].properties.id;
+ if (state.lastResample.idBits.hasBit(id)) {
+ if (eventTime < state.lastResample.eventTime ||
+ state.recentCoordinatesAreIdentical(id)) {
+ PointerCoords& msgCoords = msg.body.motion.pointers[i].coords;
+ const PointerCoords& resampleCoords = state.lastResample.getPointerById(id);
+ ALOGD_IF(debugResampling(), "[%d] - rewrite (%0.3f, %0.3f), old (%0.3f, %0.3f)", id,
+ resampleCoords.getX(), resampleCoords.getY(), msgCoords.getX(),
+ msgCoords.getY());
+ msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX());
+ msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY());
+ msgCoords.isResampled = true;
+ } else {
+ state.lastResample.idBits.clearBit(id);
+ }
+ }
+ }
+}
+
+void InputConsumer::resampleTouchState(nsecs_t sampleTime, MotionEvent* event,
+ const InputMessage* next) {
+ if (!mResampleTouch || !(isPointerEvent(event->getSource())) ||
+ event->getAction() != AMOTION_EVENT_ACTION_MOVE) {
+ return;
+ }
+
+ ssize_t index = findTouchState(event->getDeviceId(), event->getSource());
+ if (index < 0) {
+ ALOGD_IF(debugResampling(), "Not resampled, no touch state for device.");
+ return;
+ }
+
+ TouchState& touchState = mTouchStates[index];
+ if (touchState.historySize < 1) {
+ ALOGD_IF(debugResampling(), "Not resampled, no history for device.");
+ 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)) {
+ ALOGD_IF(debugResampling(), "Not resampled, missing id %d", id);
+ 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) {
+ ALOGD_IF(debugResampling(), "Not resampled, delta time is too small: %" PRId64 " ns.",
+ delta);
+ 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) {
+ ALOGD_IF(debugResampling(), "Not resampled, delta time is too small: %" PRId64 " ns.",
+ delta);
+ return;
+ } else if (delta > RESAMPLE_MAX_DELTA) {
+ ALOGD_IF(debugResampling(), "Not resampled, delta time is too large: %" PRId64 " ns.",
+ delta);
+ return;
+ }
+ nsecs_t maxPredict = current->eventTime + std::min(delta / 2, RESAMPLE_MAX_PREDICTION);
+ if (sampleTime > maxPredict) {
+ ALOGD_IF(debugResampling(),
+ "Sample time is too far in the future, adjusting prediction "
+ "from %" PRId64 " to %" PRId64 " ns.",
+ sampleTime - current->eventTime, maxPredict - current->eventTime);
+ sampleTime = maxPredict;
+ }
+ alpha = float(current->eventTime - sampleTime) / delta;
+ } else {
+ ALOGD_IF(debugResampling(), "Not resampled, insufficient data.");
+ return;
+ }
+
+ if (current->eventTime == sampleTime) {
+ // Prevents having 2 events with identical times and coordinates.
+ return;
+ }
+
+ // Resample touch coordinates.
+ History oldLastResample;
+ oldLastResample.initializeFrom(touchState.lastResample);
+ touchState.lastResample.eventTime = sampleTime;
+ touchState.lastResample.idBits.clear();
+ for (size_t i = 0; i < pointerCount; i++) {
+ uint32_t id = event->getPointerId(i);
+ touchState.lastResample.idToIndex[id] = i;
+ touchState.lastResample.idBits.markBit(id);
+ if (oldLastResample.hasPointerId(id) && touchState.recentCoordinatesAreIdentical(id)) {
+ // We maintain the previously resampled value for this pointer (stored in
+ // oldLastResample) when the coordinates for this pointer haven't changed since then.
+ // This way we don't introduce artificial jitter when pointers haven't actually moved.
+ // The isResampled flag isn't cleared as the values don't reflect what the device is
+ // actually reporting.
+
+ // We know here that the coordinates for the pointer haven't changed because we
+ // would've cleared the resampled bit in rewriteMessage if they had. We can't modify
+ // lastResample in place because the mapping from pointer ID to index may have changed.
+ touchState.lastResample.pointers[i] = oldLastResample.getPointerById(id);
+ continue;
+ }
+
+ PointerCoords& resampledCoords = touchState.lastResample.pointers[i];
+ const PointerCoords& currentCoords = current->getPointerById(id);
+ resampledCoords = currentCoords;
+ resampledCoords.isResampled = true;
+ if (other->idBits.hasBit(id) && shouldResampleTool(event->getToolType(i))) {
+ const PointerCoords& otherCoords = other->getPointerById(id);
+ resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_X,
+ lerp(currentCoords.getX(), otherCoords.getX(), alpha));
+ resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_Y,
+ lerp(currentCoords.getY(), otherCoords.getY(), alpha));
+ ALOGD_IF(debugResampling(),
+ "[%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);
+ } else {
+ ALOGD_IF(debugResampling(), "[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f)", id,
+ resampledCoords.getX(), resampledCoords.getY(), currentCoords.getX(),
+ currentCoords.getY());
+ }
+ }
+
+ event->addSample(sampleTime, touchState.lastResample.pointers);
+}
+
+status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) {
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s",
+ mChannel->getName().c_str(), seq, toString(handled));
+
+ if (!seq) {
+ ALOGE("Attempted to send a finished signal with sequence number 0.");
+ return BAD_VALUE;
+ }
+
+ // Send finished signals for the batch sequence chain first.
+ size_t seqChainCount = mSeqChains.size();
+ if (seqChainCount) {
+ uint32_t currentSeq = seq;
+ uint32_t chainSeqs[seqChainCount];
+ size_t chainIndex = 0;
+ for (size_t i = seqChainCount; i > 0;) {
+ i--;
+ const SeqChain& seqChain = mSeqChains[i];
+ if (seqChain.seq == currentSeq) {
+ currentSeq = seqChain.chain;
+ chainSeqs[chainIndex++] = currentSeq;
+ mSeqChains.erase(mSeqChains.begin() + i);
+ }
+ }
+ status_t status = OK;
+ while (!status && chainIndex > 0) {
+ chainIndex--;
+ status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled);
+ }
+ if (status) {
+ // An error occurred so at least one signal was not sent, reconstruct the chain.
+ for (;;) {
+ SeqChain seqChain;
+ seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq;
+ seqChain.chain = chainSeqs[chainIndex];
+ mSeqChains.push_back(seqChain);
+ if (!chainIndex) break;
+ chainIndex--;
+ }
+ return status;
+ }
+ }
+
+ // Send finished signal for the last message in the batch.
+ return sendUnchainedFinishedSignal(seq, handled);
+}
+
+status_t InputConsumer::sendTimeline(int32_t inputEventId,
+ std::array<nsecs_t, GraphicsTimeline::SIZE> graphicsTimeline) {
+ ALOGD_IF(DEBUG_TRANSPORT_CONSUMER,
+ "channel '%s' consumer ~ sendTimeline: inputEventId=%" PRId32
+ ", gpuCompletedTime=%" PRId64 ", presentTime=%" PRId64,
+ mChannel->getName().c_str(), inputEventId,
+ graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME],
+ graphicsTimeline[GraphicsTimeline::PRESENT_TIME]);
+
+ InputMessage msg;
+ msg.header.type = InputMessage::Type::TIMELINE;
+ msg.header.seq = 0;
+ msg.body.timeline.eventId = inputEventId;
+ msg.body.timeline.graphicsTimeline = std::move(graphicsTimeline);
+ return mChannel->sendMessage(&msg);
+}
+
+nsecs_t InputConsumer::getConsumeTime(uint32_t seq) const {
+ auto it = mConsumeTimes.find(seq);
+ // Consume time will be missing if either 'finishInputEvent' is called twice, or if it was
+ // called for the wrong (synthetic?) input event. Either way, it is a bug that should be fixed.
+ LOG_ALWAYS_FATAL_IF(it == mConsumeTimes.end(), "Could not find consume time for seq=%" PRIu32,
+ seq);
+ return it->second;
+}
+
+void InputConsumer::popConsumeTime(uint32_t seq) {
+ mConsumeTimes.erase(seq);
+}
+
+status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) {
+ InputMessage msg;
+ msg.header.type = InputMessage::Type::FINISHED;
+ msg.header.seq = seq;
+ msg.body.finished.handled = handled;
+ msg.body.finished.consumeTime = getConsumeTime(seq);
+ status_t result = mChannel->sendMessage(&msg);
+ if (result == OK) {
+ // Remove the consume time if the socket write succeeded. We will not need to ack this
+ // message anymore. If the socket write did not succeed, we will try again and will still
+ // need consume time.
+ popConsumeTime(seq);
+
+ // Trace the event processing timeline - event was just finished
+ ATRACE_ASYNC_END("InputConsumer processing", /*cookie=*/seq);
+ }
+ return result;
+}
+
+bool InputConsumer::hasPendingBatch() const {
+ return !mBatches.empty();
+}
+
+int32_t InputConsumer::getPendingBatchSource() const {
+ if (mBatches.empty()) {
+ return AINPUT_SOURCE_CLASS_NONE;
+ }
+
+ const Batch& batch = mBatches[0];
+ const InputMessage& head = batch.samples[0];
+ return head.body.motion.source;
+}
+
+bool InputConsumer::probablyHasInput() const {
+ return hasPendingBatch() || mChannel->probablyHasInput();
+}
+
+ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const {
+ for (size_t i = 0; i < mBatches.size(); i++) {
+ const Batch& batch = mBatches[i];
+ const InputMessage& head = batch.samples[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[i];
+ if (touchState.deviceId == deviceId && touchState.source == source) {
+ return i;
+ }
+ }
+ return -1;
+}
+
+bool InputConsumer::canAddSample(const Batch& batch, const InputMessage* msg) {
+ const InputMessage& head = batch.samples[0];
+ uint32_t pointerCount = msg->body.motion.pointerCount;
+ if (head.body.motion.pointerCount != pointerCount ||
+ head.body.motion.action != msg->body.motion.action) {
+ return false;
+ }
+ for (size_t i = 0; i < pointerCount; i++) {
+ if (head.body.motion.pointers[i].properties != msg->body.motion.pointers[i].properties) {
+ return false;
+ }
+ }
+ return true;
+}
+
+ssize_t InputConsumer::findSampleNoLaterThan(const Batch& batch, nsecs_t time) {
+ size_t numSamples = batch.samples.size();
+ size_t index = 0;
+ while (index < numSamples && batch.samples[index].body.motion.eventTime <= time) {
+ index += 1;
+ }
+ return ssize_t(index) - 1;
+}
+
+std::string InputConsumer::dump() const {
+ std::string out;
+ out = out + "mResampleTouch = " + toString(mResampleTouch) + "\n";
+ out = out + "mChannel = " + mChannel->getName() + "\n";
+ out = out + "mMsgDeferred: " + toString(mMsgDeferred) + "\n";
+ if (mMsgDeferred) {
+ out = out + "mMsg : " + ftl::enum_string(mMsg.header.type) + "\n";
+ }
+ out += "Batches:\n";
+ for (const Batch& batch : mBatches) {
+ out += " Batch:\n";
+ for (const InputMessage& msg : batch.samples) {
+ out += android::base::StringPrintf(" Message %" PRIu32 ": %s ", msg.header.seq,
+ ftl::enum_string(msg.header.type).c_str());
+ switch (msg.header.type) {
+ case InputMessage::Type::KEY: {
+ out += android::base::StringPrintf("action=%s keycode=%" PRId32,
+ KeyEvent::actionToString(
+ msg.body.key.action),
+ msg.body.key.keyCode);
+ break;
+ }
+ case InputMessage::Type::MOTION: {
+ out = out + "action=" + MotionEvent::actionToString(msg.body.motion.action);
+ for (uint32_t i = 0; i < msg.body.motion.pointerCount; i++) {
+ const float x = msg.body.motion.pointers[i].coords.getX();
+ const float y = msg.body.motion.pointers[i].coords.getY();
+ out += android::base::StringPrintf("\n Pointer %" PRIu32
+ " : x=%.1f y=%.1f",
+ i, x, y);
+ }
+ break;
+ }
+ case InputMessage::Type::FINISHED: {
+ out += android::base::StringPrintf("handled=%s, consumeTime=%" PRId64,
+ toString(msg.body.finished.handled),
+ msg.body.finished.consumeTime);
+ break;
+ }
+ case InputMessage::Type::FOCUS: {
+ out += android::base::StringPrintf("hasFocus=%s",
+ toString(msg.body.focus.hasFocus));
+ break;
+ }
+ case InputMessage::Type::CAPTURE: {
+ out += android::base::StringPrintf("hasCapture=%s",
+ toString(msg.body.capture
+ .pointerCaptureEnabled));
+ break;
+ }
+ case InputMessage::Type::DRAG: {
+ out += android::base::StringPrintf("x=%.1f y=%.1f, isExiting=%s",
+ msg.body.drag.x, msg.body.drag.y,
+ toString(msg.body.drag.isExiting));
+ break;
+ }
+ case InputMessage::Type::TIMELINE: {
+ const nsecs_t gpuCompletedTime =
+ msg.body.timeline
+ .graphicsTimeline[GraphicsTimeline::GPU_COMPLETED_TIME];
+ const nsecs_t presentTime =
+ msg.body.timeline.graphicsTimeline[GraphicsTimeline::PRESENT_TIME];
+ out += android::base::StringPrintf("inputEventId=%" PRId32
+ ", gpuCompletedTime=%" PRId64
+ ", presentTime=%" PRId64,
+ msg.body.timeline.eventId, gpuCompletedTime,
+ presentTime);
+ break;
+ }
+ case InputMessage::Type::TOUCH_MODE: {
+ out += android::base::StringPrintf("isInTouchMode=%s",
+ toString(msg.body.touchMode.isInTouchMode));
+ break;
+ }
+ }
+ out += "\n";
+ }
+ }
+ if (mBatches.empty()) {
+ out += " <empty>\n";
+ }
+ out += "mSeqChains:\n";
+ for (const SeqChain& chain : mSeqChains) {
+ out += android::base::StringPrintf(" chain: seq = %" PRIu32 " chain=%" PRIu32, chain.seq,
+ chain.chain);
+ }
+ if (mSeqChains.empty()) {
+ out += " <empty>\n";
+ }
+ out += "mConsumeTimes:\n";
+ for (const auto& [seq, consumeTime] : mConsumeTimes) {
+ out += android::base::StringPrintf(" seq = %" PRIu32 " consumeTime = %" PRId64, seq,
+ consumeTime);
+ }
+ if (mConsumeTimes.empty()) {
+ out += " <empty>\n";
+ }
+ return out;
+}
+
+} // namespace android
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-10-21 11:05:26 +0000