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/*
* Copyright 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.
*/
// clang-format off
#include "../Macros.h"
// clang-format on
#include "SlopController.h"
namespace {
int signOf(float value) {
if (value == 0) return 0;
if (value > 0) return 1;
return -1;
}
} // namespace
namespace android {
SlopController::SlopController(float slopThreshold, nsecs_t slopDurationNanos)
: mSlopThreshold(slopThreshold), mSlopDurationNanos(slopDurationNanos) {}
float SlopController::consumeEvent(nsecs_t eventTimeNanos, float value) {
if (mSlopDurationNanos == 0) {
return value;
}
if (shouldResetSlopTracking(eventTimeNanos, value)) {
mCumulativeValue = 0;
mHasSlopBeenMet = false;
}
mLastEventTimeNanos = eventTimeNanos;
if (mHasSlopBeenMet) {
// Since slop has already been met, we know that all of the current value would pass the
// slop threshold. So return that, without any further processing.
return value;
}
mCumulativeValue += value;
if (abs(mCumulativeValue) >= mSlopThreshold) {
ALOGD("SlopController: did not drop event with value %.3f", value);
mHasSlopBeenMet = true;
// Return the amount of value that exceeds the slop.
return signOf(value) * (abs(mCumulativeValue) - mSlopThreshold);
}
ALOGD("SlopController: dropping event with value %.3f", value);
return 0;
}
bool SlopController::shouldResetSlopTracking(nsecs_t eventTimeNanos, float value) const {
const nsecs_t ageNanos = eventTimeNanos - mLastEventTimeNanos;
if (ageNanos >= mSlopDurationNanos) {
return true;
}
if (value == 0) {
return false;
}
if (signOf(mCumulativeValue) != signOf(value)) {
return true;
}
return false;
}
} // namespace android
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