1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
|
/*
* 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.
*/
#include <input/AccelerationCurve.h>
#include <array>
#include <limits>
#include <log/log_main.h>
#define LOG_TAG "AccelerationCurve"
namespace android {
namespace {
// The last segment must have an infinite maximum speed, so that all speeds are covered.
constexpr std::array<AccelerationCurveSegment, 4> kSegments = {{
{32.002, 3.19, 0},
{52.83, 4.79, -51.254},
{119.124, 7.28, -182.737},
{std::numeric_limits<double>::infinity(), 15.04, -1107.556},
}};
static_assert(kSegments.back().maxPointerSpeedMmPerS == std::numeric_limits<double>::infinity());
constexpr std::array<double, 15> kSensitivityFactors = {1, 2, 4, 6, 7, 8, 9, 10,
11, 12, 13, 14, 16, 18, 20};
} // namespace
std::vector<AccelerationCurveSegment> createAccelerationCurveForPointerSensitivity(
int32_t sensitivity) {
LOG_ALWAYS_FATAL_IF(sensitivity < -7 || sensitivity > 7, "Invalid pointer sensitivity value");
std::vector<AccelerationCurveSegment> output;
output.reserve(kSegments.size());
// The curves we want to produce for different sensitivity values are actually the same curve,
// just scaled in the Y (gain) axis by a sensitivity factor and a couple of constants.
double commonFactor = 0.64 * kSensitivityFactors[sensitivity + 7] / 10;
for (AccelerationCurveSegment seg : kSegments) {
output.push_back(AccelerationCurveSegment{seg.maxPointerSpeedMmPerS,
commonFactor * seg.baseGain,
commonFactor * seg.reciprocal});
}
return output;
}
} // namespace android
|