Merge "Add function for scaling haptic data." (af1156a3) · Commits · e / os / android_frameworks_native-old

libs/vibrator/Android.bp

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		@@ -14,6 +14,8 @@

		cc_library_shared {
		name: "libvibrator",
		vendor_available: true,
		double_loadable: true,

		shared_libs: [
		"libbinder",

libs/vibrator/ExternalVibrationUtils.cpp

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		/*
		* Copyright (C) 2020 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 <cstring>

		#include <math.h>

		#include <vibrator/ExternalVibrationUtils.h>

		namespace android::os {

		namespace {
		static constexpr float HAPTIC_SCALE_VERY_LOW_RATIO = 2.0f / 3.0f;
		static constexpr float HAPTIC_SCALE_LOW_RATIO = 3.0f / 4.0f;
		static constexpr float HAPTIC_MAX_AMPLITUDE_FLOAT = 1.0f;

		float getHapticScaleGamma(HapticScale scale) {
		switch (scale) {
		case HapticScale::VERY_LOW:
		return 2.0f;
		case HapticScale::LOW:
		return 1.5f;
		case HapticScale::HIGH:
		return 0.5f;
		case HapticScale::VERY_HIGH:
		return 0.25f;
		default:
		return 1.0f;
		}
		}

		float getHapticMaxAmplitudeRatio(HapticScale scale) {
		switch (scale) {
		case HapticScale::VERY_LOW:
		return HAPTIC_SCALE_VERY_LOW_RATIO;
		case HapticScale::LOW:
		return HAPTIC_SCALE_LOW_RATIO;
		case HapticScale::NONE:
		case HapticScale::HIGH:
		case HapticScale::VERY_HIGH:
		return 1.0f;
		default:
		return 0.0f;
		}
		}

		} // namespace

		bool isValidHapticScale(HapticScale scale) {
		switch (scale) {
		case HapticScale::MUTE:
		case HapticScale::VERY_LOW:
		case HapticScale::LOW:
		case HapticScale::NONE:
		case HapticScale::HIGH:
		case HapticScale::VERY_HIGH:
		return true;
		}
		return false;
		}

		void scaleHapticData(float* buffer, size_t length, HapticScale scale) {
		if (!isValidHapticScale(scale) \|\| scale == HapticScale::NONE) {
		return;
		}
		if (scale == HapticScale::MUTE) {
		memset(buffer, 0, length * sizeof(float));
		return;
		}
		float gamma = getHapticScaleGamma(scale);
		float maxAmplitudeRatio = getHapticMaxAmplitudeRatio(scale);
		for (size_t i = 0; i < length; i++) {
		float sign = buffer[i] >= 0 ? 1.0 : -1.0;
		buffer[i] = powf(fabsf(buffer[i] / HAPTIC_MAX_AMPLITUDE_FLOAT), gamma)
		* maxAmplitudeRatio * HAPTIC_MAX_AMPLITUDE_FLOAT * sign;
		}
		}

		} // namespace android::os

libs/vibrator/include/vibrator/ExternalVibrationUtils.h

0 → 100644

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		/*
		* Copyright (C) 2020 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.
		*/

		#ifndef ANDROID_EXTERNAL_VIBRATION_UTILS_H
		#define ANDROID_EXTERNAL_VIBRATION_UTILS_H

		#include <android/os/IExternalVibratorService.h>

		namespace android::os {

		enum class HapticScale {
		MUTE = IExternalVibratorService::SCALE_MUTE,
		VERY_LOW = IExternalVibratorService::SCALE_VERY_LOW,
		LOW = IExternalVibratorService::SCALE_LOW,
		NONE = IExternalVibratorService::SCALE_NONE,
		HIGH = IExternalVibratorService::SCALE_HIGH,
		VERY_HIGH = IExternalVibratorService::SCALE_VERY_HIGH,
		};

		bool isValidHapticScale(HapticScale scale);

		void scaleHapticData(float* buffer, size_t length, HapticScale scale);

		} // namespace android::os

		#endif // ANDROID_EXTERNAL_VIBRATION_UTILS_H