128 lines
4.9 KiB
C++
128 lines
4.9 KiB
C++
/*
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* Copyright (C) 2022 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 <input/DisplayViewport.h>
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#include <stdint.h>
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#include <ui/Rotation.h>
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#include "EventHub.h"
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#include "InputListener.h"
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#include "InputReaderContext.h"
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namespace android {
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namespace {
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[[nodiscard]] std::list<NotifyArgs> synthesizeButtonKey(
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InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
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int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
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int32_t lastButtonState, int32_t currentButtonState, int32_t buttonState, int32_t keyCode) {
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std::list<NotifyArgs> out;
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if ((action == AKEY_EVENT_ACTION_DOWN && !(lastButtonState & buttonState) &&
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(currentButtonState & buttonState)) ||
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(action == AKEY_EVENT_ACTION_UP && (lastButtonState & buttonState) &&
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!(currentButtonState & buttonState))) {
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out.push_back(NotifyKeyArgs(context->getNextId(), when, readTime, deviceId, source,
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displayId, policyFlags, action, 0, keyCode, 0,
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context->getGlobalMetaState(), when));
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}
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return out;
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}
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} // namespace
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ui::Rotation getInverseRotation(ui::Rotation orientation) {
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switch (orientation) {
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case ui::ROTATION_90:
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return ui::ROTATION_270;
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case ui::ROTATION_270:
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return ui::ROTATION_90;
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default:
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return orientation;
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}
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}
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void rotateDelta(ui::Rotation orientation, float* deltaX, float* deltaY) {
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float temp;
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switch (orientation) {
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case ui::ROTATION_90:
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temp = *deltaX;
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*deltaX = *deltaY;
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*deltaY = -temp;
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break;
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case ui::ROTATION_180:
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*deltaX = -*deltaX;
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*deltaY = -*deltaY;
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break;
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case ui::ROTATION_270:
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temp = *deltaX;
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*deltaX = -*deltaY;
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*deltaY = temp;
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break;
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default:
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break;
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}
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}
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bool isPointerDown(int32_t buttonState) {
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return buttonState &
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(AMOTION_EVENT_BUTTON_PRIMARY | AMOTION_EVENT_BUTTON_SECONDARY |
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AMOTION_EVENT_BUTTON_TERTIARY);
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}
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[[nodiscard]] std::list<NotifyArgs> synthesizeButtonKeys(
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InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
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int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
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int32_t lastButtonState, int32_t currentButtonState) {
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std::list<NotifyArgs> out;
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out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
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policyFlags, lastButtonState, currentButtonState,
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AMOTION_EVENT_BUTTON_BACK, AKEYCODE_BACK);
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out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
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policyFlags, lastButtonState, currentButtonState,
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AMOTION_EVENT_BUTTON_FORWARD, AKEYCODE_FORWARD);
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return out;
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}
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std::tuple<nsecs_t /*eventTime*/, nsecs_t /*readTime*/> applyBluetoothTimestampSmoothening(
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const InputDeviceIdentifier& identifier, nsecs_t currentEventTime, nsecs_t readTime,
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nsecs_t lastEventTime) {
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if (identifier.bus != BUS_BLUETOOTH) {
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return {currentEventTime, readTime};
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}
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// Assume the fastest rate at which a Bluetooth touch device can report input events is one
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// every 4 milliseconds, or 250 Hz. Timestamps for successive events from a Bluetooth device
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// will be separated by at least this amount.
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constexpr static nsecs_t MIN_BLUETOOTH_TIMESTAMP_DELTA = ms2ns(4);
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// We define a maximum smoothing time delta so that we don't generate events too far into the
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// future.
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constexpr static nsecs_t MAX_BLUETOOTH_SMOOTHING_DELTA = ms2ns(32);
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const nsecs_t smoothenedEventTime =
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std::min(std::max(currentEventTime, lastEventTime + MIN_BLUETOOTH_TIMESTAMP_DELTA),
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currentEventTime + MAX_BLUETOOTH_SMOOTHING_DELTA);
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// If we are modifying the event time, treat this event as a synthetically generated event for
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// latency tracking purposes and use the event time as the read time (zero read latency).
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const nsecs_t smoothenedReadTime =
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smoothenedEventTime != currentEventTime ? currentEventTime : readTime;
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return {smoothenedEventTime, smoothenedReadTime};
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}
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} // namespace android
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