//
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// Copyright 2010 The Android Open Source Project
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//
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// Provides a shared memory transport for input events.
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//
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#define LOG_TAG "InputTransport"
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//#define LOG_NDEBUG 0
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// Log debug messages about channel messages (send message, receive message)
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#define DEBUG_CHANNEL_MESSAGES 0
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// Log debug messages whenever InputChannel objects are created/destroyed
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#define DEBUG_CHANNEL_LIFECYCLE 0
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// Log debug messages about transport actions
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#define DEBUG_TRANSPORT_ACTIONS 0
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// Log debug messages about touch event resampling
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#define DEBUG_RESAMPLING 0
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <math.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <android-base/stringprintf.h>
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#include <binder/Parcel.h>
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#include <cutils/properties.h>
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#include <log/log.h>
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#include <utils/Trace.h>
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#include <input/InputTransport.h>
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using android::base::StringPrintf;
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namespace android {
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// Socket buffer size. The default is typically about 128KB, which is much larger than
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// we really need. So we make it smaller. It just needs to be big enough to hold
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// a few dozen large multi-finger motion events in the case where an application gets
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// behind processing touches.
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static const size_t SOCKET_BUFFER_SIZE = 32 * 1024;
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// Nanoseconds per milliseconds.
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static const nsecs_t NANOS_PER_MS = 1000000;
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// Latency added during resampling. A few milliseconds doesn't hurt much but
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// reduces the impact of mispredicted touch positions.
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static const nsecs_t RESAMPLE_LATENCY = 5 * NANOS_PER_MS;
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// Minimum time difference between consecutive samples before attempting to resample.
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static const nsecs_t RESAMPLE_MIN_DELTA = 2 * NANOS_PER_MS;
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// Maximum time difference between consecutive samples before attempting to resample
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// by extrapolation.
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static const nsecs_t RESAMPLE_MAX_DELTA = 20 * NANOS_PER_MS;
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// Maximum time to predict forward from the last known state, to avoid predicting too
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// far into the future. This time is further bounded by 50% of the last time delta.
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static const nsecs_t RESAMPLE_MAX_PREDICTION = 8 * NANOS_PER_MS;
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/**
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* System property for enabling / disabling touch resampling.
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* Resampling extrapolates / interpolates the reported touch event coordinates to better
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* align them to the VSYNC signal, thus resulting in smoother scrolling performance.
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* Resampling is not needed (and should be disabled) on hardware that already
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* has touch events triggered by VSYNC.
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* Set to "1" to enable resampling (default).
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* Set to "0" to disable resampling.
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* Resampling is enabled by default.
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*/
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static const char* PROPERTY_RESAMPLING_ENABLED = "ro.input.resampling";
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template<typename T>
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inline static T min(const T& a, const T& b) {
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return a < b ? a : b;
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}
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inline static float lerp(float a, float b, float alpha) {
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return a + alpha * (b - a);
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}
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inline static bool isPointerEvent(int32_t source) {
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return (source & AINPUT_SOURCE_CLASS_POINTER) == AINPUT_SOURCE_CLASS_POINTER;
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}
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// --- InputMessage ---
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bool InputMessage::isValid(size_t actualSize) const {
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if (size() == actualSize) {
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switch (header.type) {
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case TYPE_KEY:
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return true;
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case TYPE_MOTION:
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return body.motion.pointerCount > 0
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&& body.motion.pointerCount <= MAX_POINTERS;
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case TYPE_FINISHED:
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return true;
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}
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}
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return false;
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}
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size_t InputMessage::size() const {
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switch (header.type) {
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case TYPE_KEY:
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return sizeof(Header) + body.key.size();
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case TYPE_MOTION:
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return sizeof(Header) + body.motion.size();
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case TYPE_FINISHED:
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return sizeof(Header) + body.finished.size();
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}
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return sizeof(Header);
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}
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/**
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* There could be non-zero bytes in-between InputMessage fields. Force-initialize the entire
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* memory to zero, then only copy the valid bytes on a per-field basis.
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*/
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void InputMessage::getSanitizedCopy(InputMessage* msg) const {
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memset(msg, 0, sizeof(*msg));
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// Write the header
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msg->header.type = header.type;
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// Write the body
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switch(header.type) {
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case InputMessage::TYPE_KEY: {
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// uint32_t seq
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msg->body.key.seq = body.key.seq;
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// nsecs_t eventTime
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msg->body.key.eventTime = body.key.eventTime;
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// int32_t deviceId
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msg->body.key.deviceId = body.key.deviceId;
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// int32_t source
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msg->body.key.source = body.key.source;
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// int32_t displayId
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msg->body.key.displayId = body.key.displayId;
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// int32_t action
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msg->body.key.action = body.key.action;
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// int32_t flags
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msg->body.key.flags = body.key.flags;
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// int32_t keyCode
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msg->body.key.keyCode = body.key.keyCode;
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// int32_t scanCode
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msg->body.key.scanCode = body.key.scanCode;
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// int32_t metaState
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msg->body.key.metaState = body.key.metaState;
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// int32_t repeatCount
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msg->body.key.repeatCount = body.key.repeatCount;
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// nsecs_t downTime
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msg->body.key.downTime = body.key.downTime;
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break;
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}
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case InputMessage::TYPE_MOTION: {
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// uint32_t seq
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msg->body.motion.seq = body.motion.seq;
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// nsecs_t eventTime
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msg->body.motion.eventTime = body.motion.eventTime;
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// int32_t deviceId
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msg->body.motion.deviceId = body.motion.deviceId;
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// int32_t source
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msg->body.motion.source = body.motion.source;
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// int32_t displayId
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msg->body.motion.displayId = body.motion.displayId;
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// int32_t action
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msg->body.motion.action = body.motion.action;
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// int32_t actionButton
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msg->body.motion.actionButton = body.motion.actionButton;
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// int32_t flags
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msg->body.motion.flags = body.motion.flags;
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// int32_t metaState
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msg->body.motion.metaState = body.motion.metaState;
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// int32_t buttonState
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msg->body.motion.buttonState = body.motion.buttonState;
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// MotionClassification classification
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msg->body.motion.classification = body.motion.classification;
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// int32_t edgeFlags
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msg->body.motion.edgeFlags = body.motion.edgeFlags;
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// nsecs_t downTime
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msg->body.motion.downTime = body.motion.downTime;
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// float xOffset
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msg->body.motion.xOffset = body.motion.xOffset;
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// float yOffset
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msg->body.motion.yOffset = body.motion.yOffset;
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// float xPrecision
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msg->body.motion.xPrecision = body.motion.xPrecision;
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// float yPrecision
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msg->body.motion.yPrecision = body.motion.yPrecision;
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// uint32_t pointerCount
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msg->body.motion.pointerCount = body.motion.pointerCount;
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//struct Pointer pointers[MAX_POINTERS]
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for (size_t i = 0; i < body.motion.pointerCount; i++) {
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// PointerProperties properties
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msg->body.motion.pointers[i].properties.id = body.motion.pointers[i].properties.id;
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msg->body.motion.pointers[i].properties.toolType =
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body.motion.pointers[i].properties.toolType,
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// PointerCoords coords
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msg->body.motion.pointers[i].coords.bits = body.motion.pointers[i].coords.bits;
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const uint32_t count = BitSet64::count(body.motion.pointers[i].coords.bits);
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memcpy(&msg->body.motion.pointers[i].coords.values[0],
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&body.motion.pointers[i].coords.values[0],
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count * (sizeof(body.motion.pointers[i].coords.values[0])));
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}
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break;
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}
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case InputMessage::TYPE_FINISHED: {
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msg->body.finished.seq = body.finished.seq;
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msg->body.finished.handled = body.finished.handled;
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break;
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}
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default: {
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LOG_FATAL("Unexpected message type %i", header.type);
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break;
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}
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}
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}
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// --- InputChannel ---
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InputChannel::InputChannel(const std::string& name, int fd) :
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mName(name) {
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#if DEBUG_CHANNEL_LIFECYCLE
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ALOGD("Input channel constructed: name='%s', fd=%d",
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mName.c_str(), fd);
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#endif
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setFd(fd);
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}
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InputChannel::~InputChannel() {
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#if DEBUG_CHANNEL_LIFECYCLE
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ALOGD("Input channel destroyed: name='%s', fd=%d",
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mName.c_str(), mFd);
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#endif
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::close(mFd);
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}
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void InputChannel::setFd(int fd) {
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if (mFd > 0) {
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::close(mFd);
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}
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mFd = fd;
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if (mFd > 0) {
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int result = fcntl(mFd, F_SETFL, O_NONBLOCK);
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LOG_ALWAYS_FATAL_IF(result != 0, "channel '%s' ~ Could not make socket "
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"non-blocking. errno=%d", mName.c_str(), errno);
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}
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}
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status_t InputChannel::openInputChannelPair(const std::string& name,
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sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel) {
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int sockets[2];
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if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sockets)) {
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status_t result = -errno;
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ALOGE("channel '%s' ~ Could not create socket pair. errno=%d",
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name.c_str(), errno);
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outServerChannel.clear();
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outClientChannel.clear();
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return result;
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}
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int bufferSize = SOCKET_BUFFER_SIZE;
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setsockopt(sockets[0], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
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setsockopt(sockets[0], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));
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setsockopt(sockets[1], SOL_SOCKET, SO_SNDBUF, &bufferSize, sizeof(bufferSize));
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setsockopt(sockets[1], SOL_SOCKET, SO_RCVBUF, &bufferSize, sizeof(bufferSize));
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std::string serverChannelName = name;
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serverChannelName += " (server)";
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outServerChannel = new InputChannel(serverChannelName, sockets[0]);
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std::string clientChannelName = name;
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clientChannelName += " (client)";
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outClientChannel = new InputChannel(clientChannelName, sockets[1]);
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return OK;
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}
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status_t InputChannel::sendMessage(const InputMessage* msg) {
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const size_t msgLength = msg->size();
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InputMessage cleanMsg;
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msg->getSanitizedCopy(&cleanMsg);
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ssize_t nWrite;
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do {
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nWrite = ::send(mFd, &cleanMsg, msgLength, MSG_DONTWAIT | MSG_NOSIGNAL);
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} while (nWrite == -1 && errno == EINTR);
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if (nWrite < 0) {
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int error = errno;
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ error sending message of type %d, errno=%d", mName.c_str(),
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msg->header.type, error);
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#endif
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if (error == EAGAIN || error == EWOULDBLOCK) {
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return WOULD_BLOCK;
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}
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if (error == EPIPE || error == ENOTCONN || error == ECONNREFUSED || error == ECONNRESET) {
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return DEAD_OBJECT;
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}
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return -error;
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}
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if (size_t(nWrite) != msgLength) {
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ error sending message type %d, send was incomplete",
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mName.c_str(), msg->header.type);
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#endif
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return DEAD_OBJECT;
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}
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ sent message of type %d", mName.c_str(), msg->header.type);
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#endif
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return OK;
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}
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status_t InputChannel::receiveMessage(InputMessage* msg) {
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ssize_t nRead;
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do {
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nRead = ::recv(mFd, msg, sizeof(InputMessage), MSG_DONTWAIT);
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} while (nRead == -1 && errno == EINTR);
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if (nRead < 0) {
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int error = errno;
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ receive message failed, errno=%d", mName.c_str(), errno);
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#endif
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if (error == EAGAIN || error == EWOULDBLOCK) {
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return WOULD_BLOCK;
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}
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if (error == EPIPE || error == ENOTCONN || error == ECONNREFUSED) {
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return DEAD_OBJECT;
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}
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return -error;
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}
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if (nRead == 0) { // check for EOF
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ receive message failed because peer was closed", mName.c_str());
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#endif
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return DEAD_OBJECT;
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}
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if (!msg->isValid(nRead)) {
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ received invalid message", mName.c_str());
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#endif
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return BAD_VALUE;
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}
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#if DEBUG_CHANNEL_MESSAGES
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ALOGD("channel '%s' ~ received message of type %d", mName.c_str(), msg->header.type);
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#endif
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return OK;
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}
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sp<InputChannel> InputChannel::dup() const {
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int fd = ::dup(getFd());
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return fd >= 0 ? new InputChannel(getName(), fd) : nullptr;
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}
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status_t InputChannel::write(Parcel& out) const {
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status_t s = out.writeString8(String8(getName().c_str()));
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if (s != OK) {
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return s;
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}
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s = out.writeStrongBinder(mToken);
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if (s != OK) {
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return s;
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}
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s = out.writeDupFileDescriptor(getFd());
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return s;
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}
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status_t InputChannel::read(const Parcel& from) {
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mName = from.readString8();
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mToken = from.readStrongBinder();
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int rawFd = from.readFileDescriptor();
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setFd(::dup(rawFd));
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if (mFd < 0) {
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return BAD_VALUE;
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}
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return OK;
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}
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sp<IBinder> InputChannel::getToken() const {
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return mToken;
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}
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void InputChannel::setToken(const sp<IBinder>& token) {
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if (mToken != nullptr) {
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ALOGE("Assigning InputChannel (%s) a second handle?", mName.c_str());
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}
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mToken = token;
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}
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// --- InputPublisher ---
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InputPublisher::InputPublisher(const sp<InputChannel>& channel) :
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mChannel(channel) {
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}
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InputPublisher::~InputPublisher() {
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}
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status_t InputPublisher::publishKeyEvent(
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uint32_t seq,
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int32_t deviceId,
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int32_t source,
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int32_t displayId,
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int32_t action,
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int32_t flags,
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int32_t keyCode,
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int32_t scanCode,
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int32_t metaState,
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int32_t repeatCount,
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nsecs_t downTime,
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nsecs_t eventTime) {
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if (ATRACE_ENABLED()) {
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std::string message = StringPrintf("publishKeyEvent(inputChannel=%s, keyCode=%" PRId32 ")",
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mChannel->getName().c_str(), keyCode);
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ATRACE_NAME(message.c_str());
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}
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#if DEBUG_TRANSPORT_ACTIONS
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ALOGD("channel '%s' publisher ~ publishKeyEvent: seq=%u, deviceId=%d, source=0x%x, "
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"action=0x%x, flags=0x%x, keyCode=%d, scanCode=%d, metaState=0x%x, repeatCount=%d,"
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"downTime=%" PRId64 ", eventTime=%" PRId64,
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mChannel->getName().c_str(), seq,
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deviceId, source, action, flags, keyCode, scanCode, metaState, repeatCount,
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downTime, eventTime);
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#endif
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if (!seq) {
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ALOGE("Attempted to publish a key event with sequence number 0.");
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return BAD_VALUE;
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}
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InputMessage msg;
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msg.header.type = InputMessage::TYPE_KEY;
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msg.body.key.seq = seq;
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msg.body.key.deviceId = deviceId;
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msg.body.key.source = source;
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msg.body.key.displayId = displayId;
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msg.body.key.action = action;
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msg.body.key.flags = flags;
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msg.body.key.keyCode = keyCode;
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msg.body.key.scanCode = scanCode;
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msg.body.key.metaState = metaState;
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msg.body.key.repeatCount = repeatCount;
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msg.body.key.downTime = downTime;
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msg.body.key.eventTime = eventTime;
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return mChannel->sendMessage(&msg);
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}
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status_t InputPublisher::publishMotionEvent(
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uint32_t seq,
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int32_t deviceId,
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int32_t source,
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int32_t displayId,
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int32_t action,
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int32_t actionButton,
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int32_t flags,
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int32_t edgeFlags,
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int32_t metaState,
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int32_t buttonState,
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MotionClassification classification,
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float xOffset,
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float yOffset,
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float xPrecision,
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float yPrecision,
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nsecs_t downTime,
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nsecs_t eventTime,
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uint32_t pointerCount,
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const PointerProperties* pointerProperties,
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const PointerCoords* pointerCoords) {
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if (ATRACE_ENABLED()) {
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std::string message = StringPrintf(
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"publishMotionEvent(inputChannel=%s, action=%" PRId32 ")",
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mChannel->getName().c_str(), action);
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ATRACE_NAME(message.c_str());
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}
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#if DEBUG_TRANSPORT_ACTIONS
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ALOGD("channel '%s' publisher ~ publishMotionEvent: seq=%u, deviceId=%d, source=0x%x, "
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"displayId=%" PRId32 ", "
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"action=0x%x, actionButton=0x%08x, flags=0x%x, edgeFlags=0x%x, "
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"metaState=0x%x, buttonState=0x%x, classification=%s, xOffset=%f, yOffset=%f, "
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"xPrecision=%f, yPrecision=%f, downTime=%" PRId64 ", eventTime=%" PRId64 ", "
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"pointerCount=%" PRIu32,
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mChannel->getName().c_str(), seq,
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deviceId, source, displayId, action, actionButton, flags, edgeFlags, metaState,
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buttonState, motionClassificationToString(classification),
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xOffset, yOffset, xPrecision, yPrecision, downTime, eventTime, pointerCount);
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#endif
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if (!seq) {
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ALOGE("Attempted to publish a motion event with sequence number 0.");
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return BAD_VALUE;
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}
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if (pointerCount > MAX_POINTERS || pointerCount < 1) {
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ALOGE("channel '%s' publisher ~ Invalid number of pointers provided: %" PRIu32 ".",
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mChannel->getName().c_str(), pointerCount);
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return BAD_VALUE;
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}
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InputMessage msg;
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msg.header.type = InputMessage::TYPE_MOTION;
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msg.body.motion.seq = seq;
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msg.body.motion.deviceId = deviceId;
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msg.body.motion.source = source;
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msg.body.motion.displayId = displayId;
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msg.body.motion.action = action;
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msg.body.motion.actionButton = actionButton;
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msg.body.motion.flags = flags;
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msg.body.motion.edgeFlags = edgeFlags;
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msg.body.motion.metaState = metaState;
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msg.body.motion.buttonState = buttonState;
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msg.body.motion.classification = classification;
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msg.body.motion.xOffset = xOffset;
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msg.body.motion.yOffset = yOffset;
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msg.body.motion.xPrecision = xPrecision;
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msg.body.motion.yPrecision = yPrecision;
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msg.body.motion.downTime = downTime;
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msg.body.motion.eventTime = eventTime;
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msg.body.motion.pointerCount = pointerCount;
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for (uint32_t i = 0; i < pointerCount; i++) {
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msg.body.motion.pointers[i].properties.copyFrom(pointerProperties[i]);
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msg.body.motion.pointers[i].coords.copyFrom(pointerCoords[i]);
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}
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return mChannel->sendMessage(&msg);
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}
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status_t InputPublisher::receiveFinishedSignal(uint32_t* outSeq, bool* outHandled) {
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#if DEBUG_TRANSPORT_ACTIONS
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ALOGD("channel '%s' publisher ~ receiveFinishedSignal",
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mChannel->getName().c_str());
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#endif
|
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InputMessage msg;
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status_t result = mChannel->receiveMessage(&msg);
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if (result) {
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*outSeq = 0;
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*outHandled = false;
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return result;
|
}
|
if (msg.header.type != InputMessage::TYPE_FINISHED) {
|
ALOGE("channel '%s' publisher ~ Received unexpected message of type %d from consumer",
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mChannel->getName().c_str(), msg.header.type);
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return UNKNOWN_ERROR;
|
}
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*outSeq = msg.body.finished.seq;
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*outHandled = msg.body.finished.handled;
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return OK;
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}
|
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// --- InputConsumer ---
|
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InputConsumer::InputConsumer(const sp<InputChannel>& channel) :
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mResampleTouch(isTouchResamplingEnabled()),
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mChannel(channel), mMsgDeferred(false) {
|
}
|
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InputConsumer::~InputConsumer() {
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}
|
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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) {
|
#if DEBUG_TRANSPORT_ACTIONS
|
ALOGD("channel '%s' consumer ~ consume: consumeBatches=%s, frameTime=%" PRId64,
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mChannel->getName().c_str(), consumeBatches ? "true" : "false", frameTime);
|
#endif
|
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*outSeq = 0;
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*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) {
|
// 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().c_str(), *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().c_str(), *outSeq);
|
#endif
|
break;
|
}
|
|
case InputMessage::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().c_str());
|
#endif
|
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.itemAt(i);
|
sendFinishedSignal(msg.body.motion.seq, false);
|
}
|
batch.samples.removeItemsAt(0, count);
|
mBatches.removeAt(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.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().c_str(), *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().c_str());
|
#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().c_str(), *outSeq);
|
#endif
|
break;
|
}
|
|
default:
|
ALOGE("channel '%s' consumer ~ Received unexpected message of type %d",
|
mChannel->getName().c_str(), 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; ) {
|
i--;
|
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;
|
if (mResampleTouch) {
|
sampleTime -= 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 = nullptr;
|
} else {
|
next = &batch.samples.itemAt(0);
|
}
|
if (!result && mResampleTouch) {
|
resampleTouchState(sampleTime, static_cast<MotionEvent*>(*outEvent), next);
|
}
|
return result;
|
}
|
|
return WOULD_BLOCK;
|
}
|
|
status_t InputConsumer::consumeSamples(InputEventFactoryInterface* factory,
|
Batch& batch, size_t count, uint32_t* outSeq, InputEvent** outEvent) {
|
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 || !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();
|
index = mTouchStates.size() - 1;
|
}
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
touchState.initialize(deviceId, source);
|
touchState.addHistory(msg);
|
break;
|
}
|
|
case AMOTION_EVENT_ACTION_MOVE: {
|
ssize_t index = findTouchState(deviceId, source);
|
if (index >= 0) {
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
touchState.addHistory(msg);
|
rewriteMessage(touchState, msg);
|
}
|
break;
|
}
|
|
case AMOTION_EVENT_ACTION_POINTER_DOWN: {
|
ssize_t index = findTouchState(deviceId, source);
|
if (index >= 0) {
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
touchState.lastResample.idBits.clearBit(msg.body.motion.getActionId());
|
rewriteMessage(touchState, msg);
|
}
|
break;
|
}
|
|
case AMOTION_EVENT_ACTION_POINTER_UP: {
|
ssize_t index = findTouchState(deviceId, source);
|
if (index >= 0) {
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
rewriteMessage(touchState, msg);
|
touchState.lastResample.idBits.clearBit(msg.body.motion.getActionId());
|
}
|
break;
|
}
|
|
case AMOTION_EVENT_ACTION_SCROLL: {
|
ssize_t index = findTouchState(deviceId, source);
|
if (index >= 0) {
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
rewriteMessage(touchState, msg);
|
}
|
break;
|
}
|
|
case AMOTION_EVENT_ACTION_UP:
|
case AMOTION_EVENT_ACTION_CANCEL: {
|
ssize_t index = findTouchState(deviceId, source);
|
if (index >= 0) {
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
rewriteMessage(touchState, msg);
|
mTouchStates.removeAt(index);
|
}
|
break;
|
}
|
}
|
}
|
|
/**
|
* Replace the coordinates in msg with the coordinates in lastResample, if necessary.
|
*
|
* If lastResample is no longer valid for a specific pointer (i.e. the lastResample time
|
* is in the past relative to msg and the past two events do not contain identical coordinates),
|
* then invalidate the lastResample data for that pointer.
|
* If the two past events have identical coordinates, then lastResample data for that pointer will
|
* remain valid, and will be used to replace these coordinates. Thus, if a certain coordinate x0 is
|
* resampled to the new value x1, then x1 will always be used to replace x0 until some new value
|
* not equal to x0 is received.
|
*/
|
void InputConsumer::rewriteMessage(TouchState& state, InputMessage& msg) {
|
nsecs_t eventTime = msg.body.motion.eventTime;
|
for (uint32_t i = 0; i < msg.body.motion.pointerCount; i++) {
|
uint32_t id = msg.body.motion.pointers[i].properties.id;
|
if (state.lastResample.idBits.hasBit(id)) {
|
if (eventTime < state.lastResample.eventTime ||
|
state.recentCoordinatesAreIdentical(id)) {
|
PointerCoords& msgCoords = msg.body.motion.pointers[i].coords;
|
const PointerCoords& resampleCoords = state.lastResample.getPointerById(id);
|
#if DEBUG_RESAMPLING
|
ALOGD("[%d] - rewrite (%0.3f, %0.3f), old (%0.3f, %0.3f)", id,
|
resampleCoords.getX(), resampleCoords.getY(),
|
msgCoords.getX(), msgCoords.getY());
|
#endif
|
msgCoords.setAxisValue(AMOTION_EVENT_AXIS_X, resampleCoords.getX());
|
msgCoords.setAxisValue(AMOTION_EVENT_AXIS_Y, resampleCoords.getY());
|
} else {
|
state.lastResample.idBits.clearBit(id);
|
}
|
}
|
}
|
}
|
|
void InputConsumer::resampleTouchState(nsecs_t sampleTime, MotionEvent* event,
|
const InputMessage* next) {
|
if (!mResampleTouch
|
|| !(isPointerEvent(event->getSource()))
|
|| event->getAction() != AMOTION_EVENT_ACTION_MOVE) {
|
return;
|
}
|
|
ssize_t index = findTouchState(event->getDeviceId(), event->getSource());
|
if (index < 0) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, no touch state for device.");
|
#endif
|
return;
|
}
|
|
TouchState& touchState = mTouchStates.editItemAt(index);
|
if (touchState.historySize < 1) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, no history for device.");
|
#endif
|
return;
|
}
|
|
// Ensure that the current sample has all of the pointers that need to be reported.
|
const History* current = touchState.getHistory(0);
|
size_t pointerCount = event->getPointerCount();
|
for (size_t i = 0; i < pointerCount; i++) {
|
uint32_t id = event->getPointerId(i);
|
if (!current->idBits.hasBit(id)) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, missing id %d", id);
|
#endif
|
return;
|
}
|
}
|
|
// Find the data to use for resampling.
|
const History* other;
|
History future;
|
float alpha;
|
if (next) {
|
// Interpolate between current sample and future sample.
|
// So current->eventTime <= sampleTime <= future.eventTime.
|
future.initializeFrom(*next);
|
other = &future;
|
nsecs_t delta = future.eventTime - current->eventTime;
|
if (delta < RESAMPLE_MIN_DELTA) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, delta time is too small: %" PRId64 " ns.", delta);
|
#endif
|
return;
|
}
|
alpha = float(sampleTime - current->eventTime) / delta;
|
} else if (touchState.historySize >= 2) {
|
// Extrapolate future sample using current sample and past sample.
|
// So other->eventTime <= current->eventTime <= sampleTime.
|
other = touchState.getHistory(1);
|
nsecs_t delta = current->eventTime - other->eventTime;
|
if (delta < RESAMPLE_MIN_DELTA) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, delta time is too small: %" PRId64 " ns.", delta);
|
#endif
|
return;
|
} else if (delta > RESAMPLE_MAX_DELTA) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, delta time is too large: %" PRId64 " ns.", delta);
|
#endif
|
return;
|
}
|
nsecs_t maxPredict = current->eventTime + min(delta / 2, RESAMPLE_MAX_PREDICTION);
|
if (sampleTime > maxPredict) {
|
#if DEBUG_RESAMPLING
|
ALOGD("Sample time is too far in the future, adjusting prediction "
|
"from %" PRId64 " to %" PRId64 " ns.",
|
sampleTime - current->eventTime, maxPredict - current->eventTime);
|
#endif
|
sampleTime = maxPredict;
|
}
|
alpha = float(current->eventTime - sampleTime) / delta;
|
} else {
|
#if DEBUG_RESAMPLING
|
ALOGD("Not resampled, insufficient data.");
|
#endif
|
return;
|
}
|
|
// Resample touch coordinates.
|
History oldLastResample;
|
oldLastResample.initializeFrom(touchState.lastResample);
|
touchState.lastResample.eventTime = sampleTime;
|
touchState.lastResample.idBits.clear();
|
for (size_t i = 0; i < pointerCount; i++) {
|
uint32_t id = event->getPointerId(i);
|
touchState.lastResample.idToIndex[id] = i;
|
touchState.lastResample.idBits.markBit(id);
|
if (oldLastResample.hasPointerId(id) && touchState.recentCoordinatesAreIdentical(id)) {
|
// We maintain the previously resampled value for this pointer (stored in
|
// oldLastResample) when the coordinates for this pointer haven't changed since then.
|
// This way we don't introduce artificial jitter when pointers haven't actually moved.
|
|
// We know here that the coordinates for the pointer haven't changed because we
|
// would've cleared the resampled bit in rewriteMessage if they had. We can't modify
|
// lastResample in place becasue the mapping from pointer ID to index may have changed.
|
touchState.lastResample.pointers[i].copyFrom(oldLastResample.getPointerById(id));
|
continue;
|
}
|
|
PointerCoords& resampledCoords = touchState.lastResample.pointers[i];
|
const PointerCoords& currentCoords = current->getPointerById(id);
|
resampledCoords.copyFrom(currentCoords);
|
if (other->idBits.hasBit(id)
|
&& shouldResampleTool(event->getToolType(i))) {
|
const PointerCoords& otherCoords = other->getPointerById(id);
|
resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_X,
|
lerp(currentCoords.getX(), otherCoords.getX(), alpha));
|
resampledCoords.setAxisValue(AMOTION_EVENT_AXIS_Y,
|
lerp(currentCoords.getY(), otherCoords.getY(), alpha));
|
#if DEBUG_RESAMPLING
|
ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f), "
|
"other (%0.3f, %0.3f), alpha %0.3f",
|
id, resampledCoords.getX(), resampledCoords.getY(),
|
currentCoords.getX(), currentCoords.getY(),
|
otherCoords.getX(), otherCoords.getY(),
|
alpha);
|
#endif
|
} else {
|
#if DEBUG_RESAMPLING
|
ALOGD("[%d] - out (%0.3f, %0.3f), cur (%0.3f, %0.3f)",
|
id, resampledCoords.getX(), resampledCoords.getY(),
|
currentCoords.getX(), currentCoords.getY());
|
#endif
|
}
|
}
|
|
event->addSample(sampleTime, touchState.lastResample.pointers);
|
}
|
|
bool InputConsumer::shouldResampleTool(int32_t toolType) {
|
return toolType == AMOTION_EVENT_TOOL_TYPE_FINGER
|
|| toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN;
|
}
|
|
status_t InputConsumer::sendFinishedSignal(uint32_t seq, bool handled) {
|
#if DEBUG_TRANSPORT_ACTIONS
|
ALOGD("channel '%s' consumer ~ sendFinishedSignal: seq=%u, handled=%s",
|
mChannel->getName().c_str(), seq, handled ? "true" : "false");
|
#endif
|
|
if (!seq) {
|
ALOGE("Attempted to send a finished signal with sequence number 0.");
|
return BAD_VALUE;
|
}
|
|
// Send finished signals for the batch sequence chain first.
|
size_t seqChainCount = mSeqChains.size();
|
if (seqChainCount) {
|
uint32_t currentSeq = seq;
|
uint32_t chainSeqs[seqChainCount];
|
size_t chainIndex = 0;
|
for (size_t i = seqChainCount; i > 0; ) {
|
i--;
|
const SeqChain& seqChain = mSeqChains.itemAt(i);
|
if (seqChain.seq == currentSeq) {
|
currentSeq = seqChain.chain;
|
chainSeqs[chainIndex++] = currentSeq;
|
mSeqChains.removeAt(i);
|
}
|
}
|
status_t status = OK;
|
while (!status && chainIndex > 0) {
|
chainIndex--;
|
status = sendUnchainedFinishedSignal(chainSeqs[chainIndex], handled);
|
}
|
if (status) {
|
// An error occurred so at least one signal was not sent, reconstruct the chain.
|
for (;;) {
|
SeqChain seqChain;
|
seqChain.seq = chainIndex != 0 ? chainSeqs[chainIndex - 1] : seq;
|
seqChain.chain = chainSeqs[chainIndex];
|
mSeqChains.push(seqChain);
|
if (!chainIndex) break;
|
chainIndex--;
|
}
|
return status;
|
}
|
}
|
|
// Send finished signal for the last message in the batch.
|
return sendUnchainedFinishedSignal(seq, handled);
|
}
|
|
status_t InputConsumer::sendUnchainedFinishedSignal(uint32_t seq, bool handled) {
|
InputMessage msg;
|
msg.header.type = InputMessage::TYPE_FINISHED;
|
msg.body.finished.seq = seq;
|
msg.body.finished.handled = handled;
|
return mChannel->sendMessage(&msg);
|
}
|
|
bool InputConsumer::hasDeferredEvent() const {
|
return mMsgDeferred;
|
}
|
|
bool InputConsumer::hasPendingBatch() const {
|
return !mBatches.isEmpty();
|
}
|
|
ssize_t InputConsumer::findBatch(int32_t deviceId, int32_t source) const {
|
for (size_t i = 0; i < mBatches.size(); i++) {
|
const Batch& batch = mBatches.itemAt(i);
|
const InputMessage& head = batch.samples.itemAt(0);
|
if (head.body.motion.deviceId == deviceId && head.body.motion.source == source) {
|
return i;
|
}
|
}
|
return -1;
|
}
|
|
ssize_t InputConsumer::findTouchState(int32_t deviceId, int32_t source) const {
|
for (size_t i = 0; i < mTouchStates.size(); i++) {
|
const TouchState& touchState = mTouchStates.itemAt(i);
|
if (touchState.deviceId == deviceId && touchState.source == source) {
|
return i;
|
}
|
}
|
return -1;
|
}
|
|
void InputConsumer::initializeKeyEvent(KeyEvent* event, const InputMessage* msg) {
|
event->initialize(
|
msg->body.key.deviceId,
|
msg->body.key.source,
|
msg->body.key.displayId,
|
msg->body.key.action,
|
msg->body.key.flags,
|
msg->body.key.keyCode,
|
msg->body.key.scanCode,
|
msg->body.key.metaState,
|
msg->body.key.repeatCount,
|
msg->body.key.downTime,
|
msg->body.key.eventTime);
|
}
|
|
void InputConsumer::initializeMotionEvent(MotionEvent* event, const InputMessage* msg) {
|
uint32_t pointerCount = msg->body.motion.pointerCount;
|
PointerProperties pointerProperties[pointerCount];
|
PointerCoords pointerCoords[pointerCount];
|
for (uint32_t i = 0; i < pointerCount; i++) {
|
pointerProperties[i].copyFrom(msg->body.motion.pointers[i].properties);
|
pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords);
|
}
|
|
event->initialize(
|
msg->body.motion.deviceId,
|
msg->body.motion.source,
|
msg->body.motion.displayId,
|
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,
|
msg->body.motion.xOffset,
|
msg->body.motion.yOffset,
|
msg->body.motion.xPrecision,
|
msg->body.motion.yPrecision,
|
msg->body.motion.downTime,
|
msg->body.motion.eventTime,
|
pointerCount,
|
pointerProperties,
|
pointerCoords);
|
}
|
|
void InputConsumer::addSample(MotionEvent* event, const InputMessage* msg) {
|
uint32_t pointerCount = msg->body.motion.pointerCount;
|
PointerCoords pointerCoords[pointerCount];
|
for (uint32_t i = 0; i < pointerCount; i++) {
|
pointerCoords[i].copyFrom(msg->body.motion.pointers[i].coords);
|
}
|
|
event->setMetaState(event->getMetaState() | msg->body.motion.metaState);
|
event->addSample(msg->body.motion.eventTime, pointerCoords);
|
}
|
|
bool InputConsumer::canAddSample(const Batch& batch, const InputMessage *msg) {
|
const InputMessage& head = batch.samples.itemAt(0);
|
uint32_t pointerCount = msg->body.motion.pointerCount;
|
if (head.body.motion.pointerCount != pointerCount
|
|| head.body.motion.action != msg->body.motion.action) {
|
return false;
|
}
|
for (size_t i = 0; i < pointerCount; i++) {
|
if (head.body.motion.pointers[i].properties
|
!= msg->body.motion.pointers[i].properties) {
|
return false;
|
}
|
}
|
return true;
|
}
|
|
ssize_t InputConsumer::findSampleNoLaterThan(const Batch& batch, nsecs_t time) {
|
size_t numSamples = batch.samples.size();
|
size_t index = 0;
|
while (index < numSamples
|
&& batch.samples.itemAt(index).body.motion.eventTime <= time) {
|
index += 1;
|
}
|
return ssize_t(index) - 1;
|
}
|
|
} // namespace android
|
