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/*
* Copyright (C) 2023 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.
*/
#define LOG_TAG "InputVerifier"
#include <android-base/logging.h>
#include <input/InputVerifier.h>
namespace android {
/**
* Log all of the movements that are sent to this verifier. Helps to identify the streams that lead
* to inconsistent events.
* Enable this via "adb shell setprop log.tag.InputVerifierLogEvents DEBUG"
*/
static bool logEvents() {
return __android_log_is_loggable(ANDROID_LOG_DEBUG, LOG_TAG "LogEvents", ANDROID_LOG_INFO);
}
// --- InputVerifier ---
InputVerifier::InputVerifier(const std::string& name) : mName(name){};
void InputVerifier::processMovement(int32_t deviceId, int32_t action, uint32_t pointerCount,
const PointerProperties* pointerProperties,
const PointerCoords* pointerCoords, int32_t flags) {
if (logEvents()) {
LOG(ERROR) << "Processing " << MotionEvent::actionToString(action) << " for device "
<< deviceId << " (" << pointerCount << " pointer"
<< (pointerCount == 1 ? "" : "s") << ") on " << mName;
}
switch (MotionEvent::getActionMasked(action)) {
case AMOTION_EVENT_ACTION_DOWN: {
auto [it, inserted] = mTouchingPointerIdsByDevice.insert({deviceId, {}});
if (!inserted) {
LOG(FATAL) << "Got ACTION_DOWN, but already have touching pointers " << it->second
<< " for device " << deviceId << " on " << mName;
}
it->second.set(pointerProperties[0].id);
break;
}
case AMOTION_EVENT_ACTION_POINTER_DOWN: {
auto it = mTouchingPointerIdsByDevice.find(deviceId);
if (it == mTouchingPointerIdsByDevice.end()) {
LOG(FATAL) << "Got POINTER_DOWN, but no touching pointers for device " << deviceId
<< " on " << mName;
}
it->second.set(pointerProperties[MotionEvent::getActionIndex(action)].id);
break;
}
case AMOTION_EVENT_ACTION_MOVE: {
ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "MOVE");
break;
}
case AMOTION_EVENT_ACTION_POINTER_UP: {
auto it = mTouchingPointerIdsByDevice.find(deviceId);
if (it == mTouchingPointerIdsByDevice.end()) {
LOG(FATAL) << "Got POINTER_UP, but no touching pointers for device " << deviceId
<< " on " << mName;
}
it->second.reset(pointerProperties[MotionEvent::getActionIndex(action)].id);
break;
}
case AMOTION_EVENT_ACTION_UP: {
auto it = mTouchingPointerIdsByDevice.find(deviceId);
if (it == mTouchingPointerIdsByDevice.end()) {
LOG(FATAL) << "Got ACTION_UP, but no record for deviceId " << deviceId << " on "
<< mName;
}
const auto& [_, touchingPointerIds] = *it;
if (touchingPointerIds.count() != 1) {
LOG(FATAL) << "Got ACTION_UP, but we have pointers: " << touchingPointerIds
<< " for deviceId " << deviceId << " on " << mName;
}
const int32_t pointerId = pointerProperties[0].id;
if (!touchingPointerIds.test(pointerId)) {
LOG(FATAL) << "Got ACTION_UP, but pointerId " << pointerId
<< " is not touching. Touching pointers: " << touchingPointerIds
<< " for deviceId " << deviceId << " on " << mName;
}
mTouchingPointerIdsByDevice.erase(it);
break;
}
case AMOTION_EVENT_ACTION_CANCEL: {
if ((flags & AMOTION_EVENT_FLAG_CANCELED) != AMOTION_EVENT_FLAG_CANCELED) {
LOG(FATAL) << "For ACTION_CANCEL, must set FLAG_CANCELED";
}
ensureTouchingPointersMatch(deviceId, pointerCount, pointerProperties, "CANCEL");
mTouchingPointerIdsByDevice.erase(deviceId);
break;
}
}
}
void InputVerifier::ensureTouchingPointersMatch(int32_t deviceId, uint32_t pointerCount,
const PointerProperties* pointerProperties,
const char* action) const {
auto it = mTouchingPointerIdsByDevice.find(deviceId);
if (it == mTouchingPointerIdsByDevice.end()) {
LOG(FATAL) << "Got " << action << ", but no touching pointers for device " << deviceId
<< " on " << mName;
}
const auto& [_, touchingPointerIds] = *it;
for (size_t i = 0; i < pointerCount; i++) {
const int32_t pointerId = pointerProperties[i].id;
if (!touchingPointerIds.test(pointerId)) {
LOG(FATAL) << "Got " << action << " for pointerId " << pointerId
<< " but the touching pointers are " << touchingPointerIds << " on "
<< mName;
}
}
};
} // namespace android
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