403 lines
15 KiB
C++
403 lines
15 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "../Macros.h"
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#include "MultiTouchInputMapper.h"
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#include <android/sysprop/InputProperties.sysprop.h>
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namespace android {
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// --- Constants ---
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// Maximum number of slots supported when using the slot-based Multitouch Protocol B.
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static constexpr size_t MAX_SLOTS = 32;
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// --- MultiTouchMotionAccumulator ---
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MultiTouchMotionAccumulator::MultiTouchMotionAccumulator()
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: mCurrentSlot(-1),
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mSlots(nullptr),
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mSlotCount(0),
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mUsingSlotsProtocol(false),
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mHaveStylus(false) {}
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MultiTouchMotionAccumulator::~MultiTouchMotionAccumulator() {
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delete[] mSlots;
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}
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void MultiTouchMotionAccumulator::configure(InputDeviceContext& deviceContext, size_t slotCount,
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bool usingSlotsProtocol) {
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mSlotCount = slotCount;
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mUsingSlotsProtocol = usingSlotsProtocol;
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mHaveStylus = deviceContext.hasAbsoluteAxis(ABS_MT_TOOL_TYPE);
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delete[] mSlots;
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mSlots = new Slot[slotCount];
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mCurrentSlot = -1;
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if (mUsingSlotsProtocol) {
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// Query the driver for the current slot index and use it as the initial slot
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// before we start reading events from the device. It is possible that the
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// current slot index will not be the same as it was when the first event was
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// written into the evdev buffer, which means the input mapper could start
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// out of sync with the initial state of the events in the evdev buffer.
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// In the extremely unlikely case that this happens, the data from
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// two slots will be confused until the next ABS_MT_SLOT event is received.
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// This can cause the touch point to "jump", but at least there will be
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// no stuck touches.
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int32_t initialSlot;
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if (const auto status = deviceContext.getAbsoluteAxisValue(ABS_MT_SLOT, &initialSlot);
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status == OK) {
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mCurrentSlot = initialSlot;
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} else {
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ALOGD("Could not retrieve current multi-touch slot index. status=%d", status);
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}
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}
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}
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void MultiTouchMotionAccumulator::resetSlots() {
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if (mSlots) {
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for (size_t i = 0; i < mSlotCount; i++) {
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mSlots[i].clear();
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}
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}
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mCurrentSlot = -1;
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}
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void MultiTouchMotionAccumulator::process(const RawEvent* rawEvent) {
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if (rawEvent->type == EV_ABS) {
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bool newSlot = false;
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if (mUsingSlotsProtocol) {
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if (rawEvent->code == ABS_MT_SLOT) {
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mCurrentSlot = rawEvent->value;
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newSlot = true;
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}
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} else if (mCurrentSlot < 0) {
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mCurrentSlot = 0;
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}
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if (mCurrentSlot < 0 || size_t(mCurrentSlot) >= mSlotCount) {
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if (DEBUG_POINTERS) {
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if (newSlot) {
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ALOGW("MultiTouch device emitted invalid slot index %d but it "
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"should be between 0 and %zd; ignoring this slot.",
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mCurrentSlot, mSlotCount - 1);
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}
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}
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} else {
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Slot* slot = &mSlots[mCurrentSlot];
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// If mUsingSlotsProtocol is true, it means the raw pointer has axis info of
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// ABS_MT_TRACKING_ID and ABS_MT_SLOT, so driver should send a valid trackingId while
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// updating the slot.
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if (!mUsingSlotsProtocol) {
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slot->mInUse = true;
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}
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switch (rawEvent->code) {
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case ABS_MT_POSITION_X:
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slot->mAbsMTPositionX = rawEvent->value;
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warnIfNotInUse(*rawEvent, *slot);
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break;
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case ABS_MT_POSITION_Y:
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slot->mAbsMTPositionY = rawEvent->value;
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warnIfNotInUse(*rawEvent, *slot);
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break;
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case ABS_MT_TOUCH_MAJOR:
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slot->mAbsMTTouchMajor = rawEvent->value;
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break;
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case ABS_MT_TOUCH_MINOR:
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slot->mAbsMTTouchMinor = rawEvent->value;
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slot->mHaveAbsMTTouchMinor = true;
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break;
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case ABS_MT_WIDTH_MAJOR:
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slot->mAbsMTWidthMajor = rawEvent->value;
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break;
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case ABS_MT_WIDTH_MINOR:
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slot->mAbsMTWidthMinor = rawEvent->value;
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slot->mHaveAbsMTWidthMinor = true;
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break;
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case ABS_MT_ORIENTATION:
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slot->mAbsMTOrientation = rawEvent->value;
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break;
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case ABS_MT_TRACKING_ID:
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if (mUsingSlotsProtocol && rawEvent->value < 0) {
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// The slot is no longer in use but it retains its previous contents,
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// which may be reused for subsequent touches.
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slot->mInUse = false;
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} else {
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slot->mInUse = true;
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slot->mAbsMTTrackingId = rawEvent->value;
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}
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break;
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case ABS_MT_PRESSURE:
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slot->mAbsMTPressure = rawEvent->value;
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break;
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case ABS_MT_DISTANCE:
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slot->mAbsMTDistance = rawEvent->value;
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break;
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case ABS_MT_TOOL_TYPE:
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slot->mAbsMTToolType = rawEvent->value;
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slot->mHaveAbsMTToolType = true;
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break;
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}
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}
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} else if (rawEvent->type == EV_SYN && rawEvent->code == SYN_MT_REPORT) {
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// MultiTouch Sync: The driver has returned all data for *one* of the pointers.
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mCurrentSlot += 1;
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}
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}
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void MultiTouchMotionAccumulator::finishSync() {
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if (!mUsingSlotsProtocol) {
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resetSlots();
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}
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}
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bool MultiTouchMotionAccumulator::hasStylus() const {
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return mHaveStylus;
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}
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void MultiTouchMotionAccumulator::warnIfNotInUse(const RawEvent& event, const Slot& slot) {
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if (!slot.mInUse) {
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ALOGW("Received unexpected event (0x%0x, 0x%0x) for slot %i with tracking id %i",
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event.code, event.value, mCurrentSlot, slot.mAbsMTTrackingId);
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}
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}
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// --- MultiTouchMotionAccumulator::Slot ---
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MultiTouchMotionAccumulator::Slot::Slot() {
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clear();
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}
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void MultiTouchMotionAccumulator::Slot::clear() {
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mInUse = false;
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mHaveAbsMTTouchMinor = false;
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mHaveAbsMTWidthMinor = false;
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mHaveAbsMTToolType = false;
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mAbsMTPositionX = 0;
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mAbsMTPositionY = 0;
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mAbsMTTouchMajor = 0;
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mAbsMTTouchMinor = 0;
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mAbsMTWidthMajor = 0;
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mAbsMTWidthMinor = 0;
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mAbsMTOrientation = 0;
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mAbsMTTrackingId = -1;
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mAbsMTPressure = 0;
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mAbsMTDistance = 0;
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mAbsMTToolType = 0;
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}
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int32_t MultiTouchMotionAccumulator::Slot::getToolType() const {
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if (mHaveAbsMTToolType) {
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switch (mAbsMTToolType) {
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case MT_TOOL_FINGER:
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return AMOTION_EVENT_TOOL_TYPE_FINGER;
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case MT_TOOL_PEN:
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return AMOTION_EVENT_TOOL_TYPE_STYLUS;
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case MT_TOOL_PALM:
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return AMOTION_EVENT_TOOL_TYPE_PALM;
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}
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}
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return AMOTION_EVENT_TOOL_TYPE_UNKNOWN;
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}
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// --- MultiTouchInputMapper ---
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MultiTouchInputMapper::MultiTouchInputMapper(InputDeviceContext& deviceContext)
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: TouchInputMapper(deviceContext) {}
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MultiTouchInputMapper::~MultiTouchInputMapper() {}
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void MultiTouchInputMapper::reset(nsecs_t when) {
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// The evdev multi-touch protocol does not allow userspace applications to query the initial or
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// current state of the pointers at any time. This means if we clear our accumulated state when
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// resetting the input mapper, there's no way to rebuild the full initial state of the pointers.
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// We can only wait for updates to all the pointers and axes. Rather than clearing the state and
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// rebuilding the state from scratch, we work around this kernel API limitation by never
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// fully clearing any state specific to the multi-touch protocol.
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TouchInputMapper::reset(when);
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}
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void MultiTouchInputMapper::process(const RawEvent* rawEvent) {
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TouchInputMapper::process(rawEvent);
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mMultiTouchMotionAccumulator.process(rawEvent);
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}
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std::optional<int32_t> MultiTouchInputMapper::getActiveBitId(
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const MultiTouchMotionAccumulator::Slot& inSlot) {
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if (mHavePointerIds) {
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int32_t trackingId = inSlot.getTrackingId();
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for (BitSet32 idBits(mPointerIdBits); !idBits.isEmpty();) {
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int32_t n = idBits.clearFirstMarkedBit();
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if (mPointerTrackingIdMap[n] == trackingId) {
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return std::make_optional(n);
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}
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}
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}
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return std::nullopt;
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}
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void MultiTouchInputMapper::syncTouch(nsecs_t when, RawState* outState) {
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size_t inCount = mMultiTouchMotionAccumulator.getSlotCount();
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size_t outCount = 0;
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BitSet32 newPointerIdBits;
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mHavePointerIds = true;
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for (size_t inIndex = 0; inIndex < inCount; inIndex++) {
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const MultiTouchMotionAccumulator::Slot* inSlot =
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mMultiTouchMotionAccumulator.getSlot(inIndex);
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if (!inSlot->isInUse()) {
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continue;
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}
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if (inSlot->getToolType() == AMOTION_EVENT_TOOL_TYPE_PALM) {
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std::optional<int32_t> id = getActiveBitId(*inSlot);
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if (id) {
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outState->rawPointerData.canceledIdBits.markBit(id.value());
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}
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if (DEBUG_POINTERS) {
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ALOGI("Stop processing slot %zu for it received a palm event from device %s",
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inIndex, getDeviceName().c_str());
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}
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continue;
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}
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if (outCount >= MAX_POINTERS) {
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if (DEBUG_POINTERS) {
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ALOGD("MultiTouch device %s emitted more than maximum of %zu pointers; "
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"ignoring the rest.",
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getDeviceName().c_str(), MAX_POINTERS);
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}
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break; // too many fingers!
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}
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RawPointerData::Pointer& outPointer = outState->rawPointerData.pointers[outCount];
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outPointer.x = inSlot->getX();
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outPointer.y = inSlot->getY();
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outPointer.pressure = inSlot->getPressure();
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outPointer.touchMajor = inSlot->getTouchMajor();
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outPointer.touchMinor = inSlot->getTouchMinor();
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outPointer.toolMajor = inSlot->getToolMajor();
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outPointer.toolMinor = inSlot->getToolMinor();
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outPointer.orientation = inSlot->getOrientation();
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outPointer.distance = inSlot->getDistance();
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outPointer.tiltX = 0;
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outPointer.tiltY = 0;
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outPointer.toolType = inSlot->getToolType();
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if (outPointer.toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN) {
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outPointer.toolType = mTouchButtonAccumulator.getToolType();
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if (outPointer.toolType == AMOTION_EVENT_TOOL_TYPE_UNKNOWN) {
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outPointer.toolType = AMOTION_EVENT_TOOL_TYPE_FINGER;
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}
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}
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if (shouldSimulateStylusWithTouch() &&
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outPointer.toolType == AMOTION_EVENT_TOOL_TYPE_FINGER) {
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outPointer.toolType = AMOTION_EVENT_TOOL_TYPE_STYLUS;
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}
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bool isHovering = mTouchButtonAccumulator.getToolType() != AMOTION_EVENT_TOOL_TYPE_MOUSE &&
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(mTouchButtonAccumulator.isHovering() ||
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(mRawPointerAxes.pressure.valid && inSlot->getPressure() <= 0));
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outPointer.isHovering = isHovering;
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// Assign pointer id using tracking id if available.
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if (mHavePointerIds) {
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int32_t trackingId = inSlot->getTrackingId();
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int32_t id = -1;
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if (trackingId >= 0) {
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for (BitSet32 idBits(mPointerIdBits); !idBits.isEmpty();) {
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uint32_t n = idBits.clearFirstMarkedBit();
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if (mPointerTrackingIdMap[n] == trackingId) {
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id = n;
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}
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}
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if (id < 0 && !mPointerIdBits.isFull()) {
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id = mPointerIdBits.markFirstUnmarkedBit();
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mPointerTrackingIdMap[id] = trackingId;
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}
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}
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if (id < 0) {
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mHavePointerIds = false;
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outState->rawPointerData.clearIdBits();
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newPointerIdBits.clear();
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} else {
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outPointer.id = id;
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outState->rawPointerData.idToIndex[id] = outCount;
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outState->rawPointerData.markIdBit(id, isHovering);
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newPointerIdBits.markBit(id);
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}
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}
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outCount += 1;
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}
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outState->rawPointerData.pointerCount = outCount;
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mPointerIdBits = newPointerIdBits;
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mMultiTouchMotionAccumulator.finishSync();
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}
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void MultiTouchInputMapper::configureRawPointerAxes() {
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TouchInputMapper::configureRawPointerAxes();
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getAbsoluteAxisInfo(ABS_MT_POSITION_X, &mRawPointerAxes.x);
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getAbsoluteAxisInfo(ABS_MT_POSITION_Y, &mRawPointerAxes.y);
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getAbsoluteAxisInfo(ABS_MT_TOUCH_MAJOR, &mRawPointerAxes.touchMajor);
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getAbsoluteAxisInfo(ABS_MT_TOUCH_MINOR, &mRawPointerAxes.touchMinor);
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getAbsoluteAxisInfo(ABS_MT_WIDTH_MAJOR, &mRawPointerAxes.toolMajor);
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getAbsoluteAxisInfo(ABS_MT_WIDTH_MINOR, &mRawPointerAxes.toolMinor);
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getAbsoluteAxisInfo(ABS_MT_ORIENTATION, &mRawPointerAxes.orientation);
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getAbsoluteAxisInfo(ABS_MT_PRESSURE, &mRawPointerAxes.pressure);
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getAbsoluteAxisInfo(ABS_MT_DISTANCE, &mRawPointerAxes.distance);
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getAbsoluteAxisInfo(ABS_MT_TRACKING_ID, &mRawPointerAxes.trackingId);
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getAbsoluteAxisInfo(ABS_MT_SLOT, &mRawPointerAxes.slot);
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if (mRawPointerAxes.trackingId.valid && mRawPointerAxes.slot.valid &&
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mRawPointerAxes.slot.minValue == 0 && mRawPointerAxes.slot.maxValue > 0) {
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size_t slotCount = mRawPointerAxes.slot.maxValue + 1;
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if (slotCount > MAX_SLOTS) {
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ALOGW("MultiTouch Device %s reported %zu slots but the framework "
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"only supports a maximum of %zu slots at this time.",
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getDeviceName().c_str(), slotCount, MAX_SLOTS);
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slotCount = MAX_SLOTS;
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}
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mMultiTouchMotionAccumulator.configure(getDeviceContext(), slotCount,
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true /*usingSlotsProtocol*/);
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} else {
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mMultiTouchMotionAccumulator.configure(getDeviceContext(), MAX_POINTERS,
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false /*usingSlotsProtocol*/);
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}
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}
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bool MultiTouchInputMapper::hasStylus() const {
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return mMultiTouchMotionAccumulator.hasStylus() || mTouchButtonAccumulator.hasStylus() ||
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shouldSimulateStylusWithTouch();
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}
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bool MultiTouchInputMapper::shouldSimulateStylusWithTouch() const {
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static const bool SIMULATE_STYLUS_WITH_TOUCH =
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sysprop::InputProperties::simulate_stylus_with_touch().value_or(false);
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return SIMULATE_STYLUS_WITH_TOUCH &&
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mParameters.deviceType == Parameters::DeviceType::TOUCH_SCREEN;
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}
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} // namespace android
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