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92 lines
2.5 KiB
92 lines
2.5 KiB
/*
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* Copyright (C) 2020 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 <cstring>
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#include <math.h>
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#include <vibrator/ExternalVibrationUtils.h>
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namespace android::os {
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namespace {
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static constexpr float HAPTIC_SCALE_VERY_LOW_RATIO = 2.0f / 3.0f;
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static constexpr float HAPTIC_SCALE_LOW_RATIO = 3.0f / 4.0f;
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static constexpr float HAPTIC_MAX_AMPLITUDE_FLOAT = 1.0f;
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float getHapticScaleGamma(HapticScale scale) {
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switch (scale) {
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case HapticScale::VERY_LOW:
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return 2.0f;
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case HapticScale::LOW:
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return 1.5f;
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case HapticScale::HIGH:
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return 0.5f;
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case HapticScale::VERY_HIGH:
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return 0.25f;
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default:
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return 1.0f;
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}
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}
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float getHapticMaxAmplitudeRatio(HapticScale scale) {
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switch (scale) {
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case HapticScale::VERY_LOW:
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return HAPTIC_SCALE_VERY_LOW_RATIO;
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case HapticScale::LOW:
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return HAPTIC_SCALE_LOW_RATIO;
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case HapticScale::NONE:
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case HapticScale::HIGH:
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case HapticScale::VERY_HIGH:
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return 1.0f;
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default:
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return 0.0f;
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}
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}
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} // namespace
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bool isValidHapticScale(HapticScale scale) {
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switch (scale) {
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case HapticScale::MUTE:
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case HapticScale::VERY_LOW:
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case HapticScale::LOW:
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case HapticScale::NONE:
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case HapticScale::HIGH:
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case HapticScale::VERY_HIGH:
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return true;
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}
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return false;
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}
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void scaleHapticData(float* buffer, size_t length, HapticScale scale) {
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if (!isValidHapticScale(scale) || scale == HapticScale::NONE) {
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return;
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}
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if (scale == HapticScale::MUTE) {
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memset(buffer, 0, length * sizeof(float));
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return;
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}
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float gamma = getHapticScaleGamma(scale);
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float maxAmplitudeRatio = getHapticMaxAmplitudeRatio(scale);
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for (size_t i = 0; i < length; i++) {
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float sign = buffer[i] >= 0 ? 1.0 : -1.0;
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buffer[i] = powf(fabsf(buffer[i] / HAPTIC_MAX_AMPLITUDE_FLOAT), gamma)
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* maxAmplitudeRatio * HAPTIC_MAX_AMPLITUDE_FLOAT * sign;
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}
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}
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} // namespace android::os
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