Attachment 116681 Details for Bug 90735 – 0001-touchpad-tweak-the-touchpad-acceleration-curve.patch

[patch] 0001-touchpad-tweak-the-touchpad-acceleration-curve.patch

0001-touchpad-tweak-the-touchpad-acceleration-curve.patch (text/plain), 1.58 KB, created by Peter Hutterer on 2015-06-24 05:34:50 UTC

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Creator: Peter Hutterer

Created: 2015-06-24 05:34:50 UTC

Size: 1.58 KB

patch

obsolete

>From 1ba2f460bb316c9257e108f1bf86cb6f971314d0 Mon Sep 17 00:00:00 2001
>From: Peter Hutterer <peter.hutterer@who-t.net>
>Date: Wed, 24 Jun 2015 15:30:39 +1000
>Subject: [PATCH libinput] touchpad: tweak the touchpad acceleration curve
>
>---
> src/filter.c | 27 +++++++++++++++++----------
> 1 file changed, 17 insertions(+), 10 deletions(-)
>
>diff --git a/src/filter.c b/src/filter.c
>index a4142e9..d13dcd6 100644
>--- a/src/filter.c
>+++ b/src/filter.c
>@@ -398,19 +398,26 @@ touchpad_accel_profile_linear(struct motion_filter *filter,
>                               double speed_in,
>                               uint64_t time)
> {
>-	/* Once normalized, touchpads see the same
>-	   acceleration as mice. that is technically correct but
>-	   subjectively wrong, we expect a touchpad to be a lot
>-	   slower than a mouse. Apply a magic factor here and proceed
>-	   as normal.  */
>-	const double TP_MAGIC_SLOWDOWN = 0.4;
>-	double speed_out;
>+	struct pointer_accelerator *accel_filter =
>+		(struct pointer_accelerator *)filter;
> 
>-	speed_in *= TP_MAGIC_SLOWDOWN;
>+	double s1, s2;
>+	double max_accel = accel_filter->accel; /* unitless factor */
>+	double threshold = accel_filter->threshold; /* units/ms */
>+	double incline = accel_filter->incline;
>+	double factor;
> 
>-	speed_out = pointer_accel_profile_linear(filter, data, speed_in, time);
>+	double baseline = 0.3;
>+	threshold = 2.0;
>+	max_accel = 0.5;
>+	incline = 0.05;
> 
>-	return speed_out * TP_MAGIC_SLOWDOWN;
>+	s1 = baseline;
>+	s2 = baseline + (speed_in - threshold) * incline;
>+
>+	factor =  min(max_accel, s2 > baseline ? s2 : s1);
>+
>+	return factor;
> }
> 
> double
>-- 
>2.4.3
>

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