From 76adf39ab39e8a99f3e4901b23b01a8d4b1f93f3 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Thu, 9 Apr 2015 16:42:00 +0200 Subject: [PATCH] filter: Make acceleration range wider The main purpose of this patch is to allow the user to actually slow down pointer movement using libinput_device_config_accel_set_speed, this is achieved by changing the max-accel setting from "2.0 - speed" to "2.0 - speed * 1.5", resulting in a max-accel of 0.5 when the user configures speed at -1.0, the other accel profile parameters are adjusted by the same factor to keep the curve the same. This means that the user can get the exact same behavior as before by multiplying the old setting by 0.6667 (2/3), this also means that this change not only allows the user to select a slower speed, but to keep things balanced the same as before, also a higher speed. Signed-off-by: Hans de Goede Reviewed-by: Peter Hutterer Signed-off-by: Peter Hutterer --- src/filter.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/src/filter.c b/src/filter.c index 033201fc..962d74de 100644 --- a/src/filter.c +++ b/src/filter.c @@ -258,13 +258,15 @@ accelerator_set_speed(struct motion_filter *filter, assert(speed >= -1.0 && speed <= 1.0); /* delay when accel kicks in */ - accel_filter->threshold = DEFAULT_THRESHOLD - speed/6.0; + accel_filter->threshold = DEFAULT_THRESHOLD - speed / 4.0; + if (accel_filter->threshold < 0.2) + accel_filter->threshold = 0.2; /* adjust max accel factor */ - accel_filter->accel = DEFAULT_ACCELERATION + speed; + accel_filter->accel = DEFAULT_ACCELERATION + speed * 1.5; /* higher speed -> faster to reach max */ - accel_filter->incline = DEFAULT_INCLINE + speed/2.0; + accel_filter->incline = DEFAULT_INCLINE + speed * 0.75; filter->speed = speed; return true;