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