41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
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From 6984628d6acf4695c24261c094def44ff37337be Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Fri, 12 Jun 2015 15:31:56 +1000
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Subject: [PATCH libinput 1/9] filter: reduce deceleration to minimal speeds
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only
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Deceleration at low speeds is intended to enhance precision when moving the
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pointer slowly. However, the adaptive deceleration we used was badly
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calibrated, at slow-but-normal speeds the pointer became too slow to manouver.
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We don't want to drop deceleration completely, the subpixel precision it
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provides is useful. And it also helps those that can't move a 1000dpi mouse by
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exactly one unit.
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Make the adaptive deceleration steeper so it only kicks in at extremely slow
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motions and defaults to 1 at anything resembling normal movement (i.e. pointer
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moves like the physical device does).
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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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Reviewed-by: Hans de Goede <hdegoede@redhat.com>
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---
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src/filter.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/filter.c b/src/filter.c
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index a4142e9..69f78b1 100644
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--- a/src/filter.c
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+++ b/src/filter.c
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@@ -386,7 +386,7 @@ pointer_accel_profile_linear(struct motion_filter *filter,
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const double threshold = accel_filter->threshold; /* units/ms */
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const double incline = accel_filter->incline;
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- s1 = min(1, 0.3 + speed_in * 4);
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+ s1 = min(1, 0.3 + speed_in * 10);
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s2 = 1 + (speed_in - threshold) * incline;
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return min(max_accel, s2 > 1 ? s2 : s1);
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--
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2.4.3
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