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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "../Macros.h"
#include <android/sysprop/InputProperties.sysprop.h>
#include "MultiTouchInputMapper.h"
namespace android {
// --- Constants ---
// Maximum number of slots supported when using the slot-based Multitouch Protocol B.
static constexpr size_t MAX_SLOTS = 32;
// --- MultiTouchInputMapper ---
MultiTouchInputMapper::MultiTouchInputMapper(InputDeviceContext& deviceContext,
const InputReaderConfiguration& readerConfig)
: TouchInputMapper(deviceContext, readerConfig) {}
MultiTouchInputMapper::~MultiTouchInputMapper() {}
std::list<NotifyArgs> MultiTouchInputMapper::reset(nsecs_t when) {
// TODO(b/291626046): Sync the MT state with the kernel using EVIOCGMTSLOTS.
mMultiTouchMotionAccumulator.reset(getDeviceContext());
mPointerIdBits.clear();
return TouchInputMapper::reset(when);
}
std::list<NotifyArgs> MultiTouchInputMapper::process(const RawEvent* rawEvent) {
std::list<NotifyArgs> out = TouchInputMapper::process(rawEvent);
mMultiTouchMotionAccumulator.process(rawEvent);
return out;
}
std::optional<int32_t> MultiTouchInputMapper::getActiveBitId(
const MultiTouchMotionAccumulator::Slot& inSlot) {
if (mHavePointerIds) {
int32_t trackingId = inSlot.getTrackingId();
for (BitSet32 idBits(mPointerIdBits); !idBits.isEmpty();) {
int32_t n = idBits.clearFirstMarkedBit();
if (mPointerTrackingIdMap[n] == trackingId) {
return std::make_optional(n);
}
}
}
return std::nullopt;
}
void MultiTouchInputMapper::syncTouch(nsecs_t when, RawState* outState) {
size_t inCount = mMultiTouchMotionAccumulator.getSlotCount();
size_t outCount = 0;
BitSet32 newPointerIdBits;
mHavePointerIds = true;
for (size_t inIndex = 0; inIndex < inCount; inIndex++) {
const MultiTouchMotionAccumulator::Slot& inSlot =
mMultiTouchMotionAccumulator.getSlot(inIndex);
if (!inSlot.isInUse()) {
continue;
}
if (inSlot.getToolType() == ToolType::PALM) {
std::optional<int32_t> id = getActiveBitId(inSlot);
if (id) {
outState->rawPointerData.canceledIdBits.markBit(id.value());
}
if (DEBUG_POINTERS) {
ALOGI("Stop processing slot %zu for it received a palm event from device %s",
inIndex, getDeviceName().c_str());
}
continue;
}
if (outCount >= MAX_POINTERS) {
if (DEBUG_POINTERS) {
ALOGD("MultiTouch device %s emitted more than maximum of %zu pointers; "
"ignoring the rest.",
getDeviceName().c_str(), MAX_POINTERS);
}
break; // too many fingers!
}
RawPointerData::Pointer& outPointer = outState->rawPointerData.pointers[outCount];
outPointer.x = inSlot.getX();
outPointer.y = inSlot.getY();
outPointer.pressure = inSlot.getPressure();
outPointer.touchMajor = inSlot.getTouchMajor();
outPointer.touchMinor = inSlot.getTouchMinor();
outPointer.toolMajor = inSlot.getToolMajor();
outPointer.toolMinor = inSlot.getToolMinor();
outPointer.orientation = inSlot.getOrientation();
outPointer.distance = inSlot.getDistance();
outPointer.tiltX = 0;
outPointer.tiltY = 0;
outPointer.toolType = inSlot.getToolType();
if (outPointer.toolType == ToolType::UNKNOWN) {
outPointer.toolType = mTouchButtonAccumulator.getToolType();
if (outPointer.toolType == ToolType::UNKNOWN) {
outPointer.toolType = ToolType::FINGER;
}
} else if (outPointer.toolType == ToolType::STYLUS && !mStylusMtToolSeen) {
mStylusMtToolSeen = true;
// The multi-touch device produced a stylus event with MT_TOOL_PEN. Dynamically
// re-configure this input device so that we add SOURCE_STYLUS if we haven't already.
// This is to cover the case where we cannot reliably detect whether a multi-touch
// device will ever produce stylus events when it is initially being configured.
if (!isFromSource(mSource, AINPUT_SOURCE_STYLUS)) {
// Add the stylus source immediately so that it is included in any events generated
// before we have a chance to re-configure the device.
mSource |= AINPUT_SOURCE_STYLUS;
bumpGeneration();
}
}
if (mShouldSimulateStylusWithTouch && outPointer.toolType == ToolType::FINGER) {
outPointer.toolType = ToolType::STYLUS;
}
bool isHovering = mTouchButtonAccumulator.getToolType() != ToolType::MOUSE &&
(mTouchButtonAccumulator.isHovering() ||
(mRawPointerAxes.pressure.valid && inSlot.getPressure() <= 0));
outPointer.isHovering = isHovering;
// Assign pointer id using tracking id if available.
if (mHavePointerIds) {
int32_t trackingId = inSlot.getTrackingId();
int32_t id = -1;
if (trackingId >= 0) {
for (BitSet32 idBits(mPointerIdBits); !idBits.isEmpty();) {
uint32_t n = idBits.clearFirstMarkedBit();
if (mPointerTrackingIdMap[n] == trackingId) {
id = n;
}
}
if (id < 0 && !mPointerIdBits.isFull()) {
id = mPointerIdBits.markFirstUnmarkedBit();
mPointerTrackingIdMap[id] = trackingId;
}
}
if (id < 0) {
mHavePointerIds = false;
outState->rawPointerData.clearIdBits();
newPointerIdBits.clear();
} else {
outPointer.id = id;
outState->rawPointerData.idToIndex[id] = outCount;
outState->rawPointerData.markIdBit(id, isHovering);
newPointerIdBits.markBit(id);
}
}
outCount += 1;
}
outState->rawPointerData.pointerCount = outCount;
mPointerIdBits = newPointerIdBits;
mMultiTouchMotionAccumulator.finishSync();
}
std::list<NotifyArgs> MultiTouchInputMapper::reconfigure(nsecs_t when,
const InputReaderConfiguration& config,
ConfigurationChanges changes) {
const bool simulateStylusWithTouch =
sysprop::InputProperties::simulate_stylus_with_touch().value_or(false);
if (simulateStylusWithTouch != mShouldSimulateStylusWithTouch) {
mShouldSimulateStylusWithTouch = simulateStylusWithTouch;
bumpGeneration();
}
return TouchInputMapper::reconfigure(when, config, changes);
}
void MultiTouchInputMapper::configureRawPointerAxes() {
TouchInputMapper::configureRawPointerAxes();
getAbsoluteAxisInfo(ABS_MT_POSITION_X, &mRawPointerAxes.x);
getAbsoluteAxisInfo(ABS_MT_POSITION_Y, &mRawPointerAxes.y);
getAbsoluteAxisInfo(ABS_MT_TOUCH_MAJOR, &mRawPointerAxes.touchMajor);
getAbsoluteAxisInfo(ABS_MT_TOUCH_MINOR, &mRawPointerAxes.touchMinor);
getAbsoluteAxisInfo(ABS_MT_WIDTH_MAJOR, &mRawPointerAxes.toolMajor);
getAbsoluteAxisInfo(ABS_MT_WIDTH_MINOR, &mRawPointerAxes.toolMinor);
getAbsoluteAxisInfo(ABS_MT_ORIENTATION, &mRawPointerAxes.orientation);
getAbsoluteAxisInfo(ABS_MT_PRESSURE, &mRawPointerAxes.pressure);
getAbsoluteAxisInfo(ABS_MT_DISTANCE, &mRawPointerAxes.distance);
getAbsoluteAxisInfo(ABS_MT_TRACKING_ID, &mRawPointerAxes.trackingId);
getAbsoluteAxisInfo(ABS_MT_SLOT, &mRawPointerAxes.slot);
if (mRawPointerAxes.trackingId.valid && mRawPointerAxes.slot.valid &&
mRawPointerAxes.slot.minValue == 0 && mRawPointerAxes.slot.maxValue > 0) {
size_t slotCount = mRawPointerAxes.slot.maxValue + 1;
if (slotCount > MAX_SLOTS) {
ALOGW("MultiTouch Device %s reported %zu slots but the framework "
"only supports a maximum of %zu slots at this time.",
getDeviceName().c_str(), slotCount, MAX_SLOTS);
slotCount = MAX_SLOTS;
}
mMultiTouchMotionAccumulator.configure(getDeviceContext(), slotCount,
/*usingSlotsProtocol=*/true);
} else {
mMultiTouchMotionAccumulator.configure(getDeviceContext(), MAX_POINTERS,
/*usingSlotsProtocol=*/false);
}
}
bool MultiTouchInputMapper::hasStylus() const {
return mStylusMtToolSeen || mTouchButtonAccumulator.hasStylus() ||
mShouldSimulateStylusWithTouch;
}
} // namespace android
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