Add support to disable mouse acceleration
Bug: 382276176
Test: atest CursorInputMapperUnitTest
Flag: com.android.hardware.input.pointer_acceleration
Change-Id: I431ac6fa3b918b1d292528f614e06532837c4a82
diff --git a/libs/input/AccelerationCurve.cpp b/libs/input/AccelerationCurve.cpp
index 0a92a71..0b47f3e 100644
--- a/libs/input/AccelerationCurve.cpp
+++ b/libs/input/AccelerationCurve.cpp
@@ -40,6 +40,18 @@
constexpr std::array<double, 15> kSensitivityFactors = {1, 2, 4, 6, 7, 8, 9, 10,
11, 12, 13, 14, 16, 18, 20};
+// Calculates the base gain for a given pointer sensitivity value.
+//
+// The base gain is a scaling factor that is applied to the pointer movement.
+// Higher sensitivity values result in larger base gains, which in turn result
+// in faster pointer movements.
+//
+// The base gain is calculated using a linear mapping function that maps the
+// sensitivity range [-7, 7] to a base gain range [0.5, 2.0].
+double calculateBaseGain(int32_t sensitivity) {
+ return 0.5 + (sensitivity + 7) * (2.0 - 0.5) / (7 + 7);
+}
+
} // namespace
std::vector<AccelerationCurveSegment> createAccelerationCurveForPointerSensitivity(
@@ -60,4 +72,13 @@
return output;
}
+std::vector<AccelerationCurveSegment> createFlatAccelerationCurve(int32_t sensitivity) {
+ LOG_ALWAYS_FATAL_IF(sensitivity < -7 || sensitivity > 7, "Invalid pointer sensitivity value");
+ std::vector<AccelerationCurveSegment> output = {
+ AccelerationCurveSegment{std::numeric_limits<double>::infinity(),
+ calculateBaseGain(sensitivity),
+ /* reciprocal = */ 0}};
+ return output;
+}
+
} // namespace android
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