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/*
* Copyright 2024 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.
*/
#pragma once
#include <cstdint>
#include <vector>
namespace android {
/**
* Describes a section of an acceleration curve as a function which outputs a scaling factor (gain)
* for the pointer movement, given the speed of the mouse or finger (in mm/s):
*
* gain(input_speed_mm_per_s) = baseGain + reciprocal / input_speed_mm_per_s
*/
struct AccelerationCurveSegment {
/**
* The maximum pointer speed at which this segment should apply, in mm/s. The last segment in a
* curve should always set this to infinity.
*/
double maxPointerSpeedMmPerS;
/** The gain for this segment before the reciprocal is taken into account. */
double baseGain;
/** The reciprocal part of the formula, which should be divided by the input speed. */
double reciprocal;
};
/**
* Creates an acceleration curve for the given pointer sensitivity value. The sensitivity value
* should be between -7 (for the lowest sensitivity) and 7, inclusive.
*/
std::vector<AccelerationCurveSegment> createAccelerationCurveForPointerSensitivity(
int32_t sensitivity);
/*
* Creates a flat acceleration curve for disabling pointer acceleration.
*
* This method generates a single AccelerationCurveSegment with specific values
* to effectively disable acceleration for both mice and touchpads.
* A flat acceleration curve ensures a constant gain, meaning that the output
* velocity is directly proportional to the input velocity, resulting in
* a 1:1 movement ratio between the input device and the on-screen pointer.
*/
std::vector<AccelerationCurveSegment> createFlatAccelerationCurve(int32_t sensitivity);
} // namespace android
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