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/*
* Copyright © 2006-2009 Simon Thum
* Copyright © 2012 Jonas Ådahl
* Copyright © 2014-2018 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "config.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>
#include "filter.h"
#include "libinput-util.h"
#include "filter-private.h"
struct trackpoint_accelerator {
struct motion_filter base;
struct pointer_trackers trackers;
double speed_factor;
double multiplier;
};
double
trackpoint_accel_profile(struct motion_filter *filter,
void *data,
double velocity,
uint64_t time)
{
struct trackpoint_accelerator *accel_filter =
(struct trackpoint_accelerator *)filter;
double factor;
velocity = v_us2ms(velocity); /* make it units/ms */
/* Just a nice-enough curve that provides fluid factor conversion
* from the minimum speed up to the real maximum. Generated by
* https://www.mycurvefit.com/ with input data
* 0 0.3
* 0.1 1
* 0.4 3
* 0.6 4
*/
factor = 10.06254 + (0.3 - 10.06254)/(1 + pow(velocity/0.9205459, 1.15363));
factor *= accel_filter->speed_factor;
return factor;
}
static struct normalized_coords
trackpoint_accelerator_filter(struct motion_filter *filter,
const struct device_float_coords *unaccelerated,
void *data, uint64_t time)
{
struct trackpoint_accelerator *accel_filter =
(struct trackpoint_accelerator *)filter;
struct device_float_coords multiplied;
struct normalized_coords coords;
double f;
double velocity;
multiplied.x = unaccelerated->x * accel_filter->multiplier;
multiplied.y = unaccelerated->y * accel_filter->multiplier;
trackers_feed(&accel_filter->trackers, &multiplied, time);
velocity = trackers_velocity(&accel_filter->trackers, time);
f = trackpoint_accel_profile(filter, data, velocity, time);
coords.x = multiplied.x * f;
coords.y = multiplied.y * f;
return coords;
}
static struct normalized_coords
trackpoint_accelerator_filter_noop(struct motion_filter *filter,
const struct device_float_coords *unaccelerated,
void *data, uint64_t time)
{
struct trackpoint_accelerator *accel_filter =
(struct trackpoint_accelerator *)filter;
struct normalized_coords coords;
coords.x = unaccelerated->x * accel_filter->multiplier;
coords.y = unaccelerated->y * accel_filter->multiplier;
return coords;
}
/* Maps the [-1, 1] speed setting into a constant acceleration
* range. This isn't a linear scale, we keep 0 as the 'optimized'
* mid-point and scale down to 0 for setting -1 and up to 5 for
* setting 1. On the premise that if you want a faster cursor, it
* doesn't matter as much whether you have 0.56789 or 0.56790,
* but for lower settings it does because you may lose movements.
* *shrug*.
*
* Magic numbers calculated by MyCurveFit.com, data points were
* 0.0 0.0
* 0.1 0.1 (because we need 4 points)
* 1 1
* 2 5
*
* This curve fits nicely into the range necessary.
*/
static inline double
speed_factor(double s)
{
s += 1; /* map to [0, 2] */
return 435837.2 + (0.04762636 - 435837.2)/(1 + pow(s/240.4549,
2.377168));
}
static bool
trackpoint_accelerator_set_speed(struct motion_filter *filter,
double speed_adjustment)
{
struct trackpoint_accelerator *accel_filter =
(struct trackpoint_accelerator*)filter;
assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
filter->speed_adjustment = speed_adjustment;
accel_filter->speed_factor = speed_factor(speed_adjustment);
return true;
}
static void
trackpoint_accelerator_restart(struct motion_filter *filter,
void *data,
uint64_t time)
{
struct trackpoint_accelerator *accel =
(struct trackpoint_accelerator *) filter;
trackers_reset(&accel->trackers, time);
}
static void
trackpoint_accelerator_destroy(struct motion_filter *filter)
{
struct trackpoint_accelerator *accel_filter =
(struct trackpoint_accelerator *)filter;
trackers_free(&accel_filter->trackers);
free(accel_filter);
}
static const struct motion_filter_interface accelerator_interface_trackpoint = {
.type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
.filter = trackpoint_accelerator_filter,
.filter_constant = trackpoint_accelerator_filter_noop,
.restart = trackpoint_accelerator_restart,
.destroy = trackpoint_accelerator_destroy,
.set_speed = trackpoint_accelerator_set_speed,
};
struct motion_filter *
create_pointer_accelerator_filter_trackpoint(double multiplier, bool use_velocity_averaging)
{
struct trackpoint_accelerator *filter;
struct pointer_delta_smoothener *smoothener;
assert(multiplier > 0.0);
/* Trackpoints are special. They don't have a movement speed like a
* mouse or a finger, instead they send a stream of events based on
* the pressure applied.
*
* Physical ranges on a trackpoint are the max values for relative
* deltas, but these are highly device-specific and unreliable to
* measure.
*
* Instead, we just have a constant multiplier we have in the quirks
* system.
*/
filter = zalloc(sizeof *filter);
if (!filter)
return NULL;
filter->multiplier = multiplier;
trackers_init(&filter->trackers, use_velocity_averaging ? 16 : 2);
filter->base.interface = &accelerator_interface_trackpoint;
smoothener = zalloc(sizeof(*smoothener));
smoothener->threshold = ms2us(10);
smoothener->value = ms2us(10);
filter->trackers.smoothener = smoothener;
return &filter->base;
}
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