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/*
* Copyright 2022 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.
*/
// clang-format off
#include "../Macros.h"
// clang-format on
#include "gestures/HardwareStateConverter.h"
#include <chrono>
#include <vector>
#include <com_android_input_flags.h>
#include <linux/input-event-codes.h>
namespace input_flags = com::android::input::flags;
namespace android {
const bool REPORT_PALMS_TO_GESTURES_LIBRARY = input_flags::report_palms_to_gestures_library();
HardwareStateConverter::HardwareStateConverter(const InputDeviceContext& deviceContext,
MultiTouchMotionAccumulator& motionAccumulator)
: mDeviceContext(deviceContext),
mMotionAccumulator(motionAccumulator),
mTouchButtonAccumulator(deviceContext) {
mTouchButtonAccumulator.configure();
}
std::optional<SelfContainedHardwareState> HardwareStateConverter::processRawEvent(
const RawEvent* rawEvent) {
std::optional<SelfContainedHardwareState> out;
if (rawEvent->type == EV_SYN && rawEvent->code == SYN_REPORT) {
out = produceHardwareState(rawEvent->when);
mMotionAccumulator.finishSync();
mMscTimestamp = 0;
}
if (rawEvent->type == EV_MSC && rawEvent->code == MSC_TIMESTAMP) {
mMscTimestamp = rawEvent->value;
}
mCursorButtonAccumulator.process(rawEvent);
mMotionAccumulator.process(rawEvent);
mTouchButtonAccumulator.process(rawEvent);
return out;
}
SelfContainedHardwareState HardwareStateConverter::produceHardwareState(nsecs_t when) {
SelfContainedHardwareState schs;
// The gestures library uses doubles to represent timestamps in seconds.
schs.state.timestamp = std::chrono::duration<stime_t>(std::chrono::nanoseconds(when)).count();
schs.state.msc_timestamp =
std::chrono::duration<stime_t>(std::chrono::microseconds(mMscTimestamp)).count();
schs.state.buttons_down = 0;
if (mCursorButtonAccumulator.isLeftPressed()) {
schs.state.buttons_down |= GESTURES_BUTTON_LEFT;
}
if (mCursorButtonAccumulator.isMiddlePressed()) {
schs.state.buttons_down |= GESTURES_BUTTON_MIDDLE;
}
if (mCursorButtonAccumulator.isRightPressed()) {
schs.state.buttons_down |= GESTURES_BUTTON_RIGHT;
}
if (mCursorButtonAccumulator.isBackPressed() || mCursorButtonAccumulator.isSidePressed()) {
schs.state.buttons_down |= GESTURES_BUTTON_BACK;
}
if (mCursorButtonAccumulator.isForwardPressed() || mCursorButtonAccumulator.isExtraPressed()) {
schs.state.buttons_down |= GESTURES_BUTTON_FORWARD;
}
schs.fingers.clear();
size_t numPalms = 0;
for (size_t i = 0; i < mMotionAccumulator.getSlotCount(); i++) {
MultiTouchMotionAccumulator::Slot slot = mMotionAccumulator.getSlot(i);
if (!slot.isInUse()) {
continue;
}
// Some touchpads continue to report contacts even after they've identified them as palms.
// We want to exclude these contacts from the HardwareStates.
if (!REPORT_PALMS_TO_GESTURES_LIBRARY && slot.getToolType() == ToolType::PALM) {
numPalms++;
continue;
}
FingerState& fingerState = schs.fingers.emplace_back();
fingerState = {};
fingerState.touch_major = slot.getTouchMajor();
fingerState.touch_minor = slot.getTouchMinor();
fingerState.width_major = slot.getToolMajor();
fingerState.width_minor = slot.getToolMinor();
fingerState.pressure = slot.getPressure();
fingerState.orientation = slot.getOrientation();
fingerState.position_x = slot.getX();
fingerState.position_y = slot.getY();
fingerState.tracking_id = slot.getTrackingId();
if (REPORT_PALMS_TO_GESTURES_LIBRARY) {
fingerState.tool_type = slot.getToolType() == ToolType::PALM
? FingerState::ToolType::kPalm
: FingerState::ToolType::kFinger;
}
}
schs.state.fingers = schs.fingers.data();
schs.state.finger_cnt = schs.fingers.size();
schs.state.touch_cnt = mTouchButtonAccumulator.getTouchCount() - numPalms;
return schs;
}
void HardwareStateConverter::reset() {
mCursorButtonAccumulator.reset(mDeviceContext);
mTouchButtonAccumulator.reset();
mMscTimestamp = 0;
}
} // namespace android
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