mirror of
https://gitlab.freedesktop.org/libinput/libinput.git
synced 2025-12-20 04:30:06 +01:00
filter: split the touchpad acceleration code into a separate file
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
This commit is contained in:
Peter Hutterer
parent
40c5b64f82
commit
b887353ab9
3 changed files with 333 additions and 177 deletions
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@ -151,6 +151,7 @@ dep_libinput_util = declare_dependency(link_with : libinput_util)
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############ libfilter.a ############
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src_libfilter = [
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'src/filter.c',
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'src/filter-touchpad.c',
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'src/filter-touchpad-x230.c',
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'src/filter-tablet.c',
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'src/filter-trackpoint.c',
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332
src/filter-touchpad.c
Normal file
332
src/filter-touchpad.c
Normal file
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@ -0,0 +1,332 @@
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/*
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* Copyright © 2006-2009 Simon Thum
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* Copyright © 2012 Jonas Ådahl
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* Copyright © 2014-2015 Red Hat, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "config.h"
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <limits.h>
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#include <math.h>
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#include "filter.h"
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#include "libinput-util.h"
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#include "filter-private.h"
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/* Once normalized, touchpads see the same acceleration as mice. that is
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* technically correct but subjectively wrong, we expect a touchpad to be a
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* lot slower than a mouse. Apply a magic factor to slow down all movements
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*/
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#define TP_MAGIC_SLOWDOWN 0.37 /* unitless factor */
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/*
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* Default parameters for pointer acceleration profiles.
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*/
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#define DEFAULT_THRESHOLD v_ms2us(0.4) /* in units/us */
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#define MINIMUM_THRESHOLD v_ms2us(0.2) /* in units/us */
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#define DEFAULT_ACCELERATION 2.0 /* unitless factor */
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#define DEFAULT_INCLINE 1.1 /* unitless factor */
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/* Touchpad acceleration */
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#define TOUCHPAD_DEFAULT_THRESHOLD 254 /* mm/s */
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#define TOUCHPAD_THRESHOLD_RANGE 184 /* mm/s */
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#define TOUCHPAD_ACCELERATION 9.0 /* unitless factor */
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#define TOUCHPAD_INCLINE 0.011 /* unitless factor */
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/*
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* Pointer acceleration filter constants
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*/
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#define NUM_POINTER_TRACKERS 16
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/**
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* Calculate the acceleration factor for the given delta with the timestamp.
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*
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* @param accel The acceleration filter
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* @param unaccelerated The raw delta in the device's dpi
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* @param data Caller-specific data
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* @param time Current time in µs
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*
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* @return A unitless acceleration factor, to be applied to the delta
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*/
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static inline double
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calculate_acceleration_factor(struct pointer_accelerator *accel,
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const struct device_float_coords *unaccelerated,
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void *data,
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uint64_t time)
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{
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double velocity; /* units/us in device-native dpi*/
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double accel_factor;
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feed_trackers(&accel->trackers, unaccelerated, time);
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velocity = calculate_velocity(&accel->trackers, time);
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accel_factor = calculate_acceleration_simpsons(&accel->base,
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accel->profile,
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data,
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velocity,
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accel->last_velocity,
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time);
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accel->last_velocity = velocity;
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return accel_factor;
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}
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/**
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* Generic filter that calculates the acceleration factor and applies it to
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* the coordinates.
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*
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* @param filter The acceleration filter
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* @param unaccelerated The raw delta in the device's dpi
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* @param data Caller-specific data
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* @param time Current time in µs
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*
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* @return An accelerated tuple of coordinates representing accelerated
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* motion, still in device units.
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*/
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static struct device_float_coords
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accelerator_filter_generic(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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void *data, uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *) filter;
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double accel_value; /* unitless factor */
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struct device_float_coords accelerated;
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accel_value = calculate_acceleration_factor(accel,
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unaccelerated,
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data,
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time);
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accelerated.x = accel_value * unaccelerated->x;
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accelerated.y = accel_value * unaccelerated->y;
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return accelerated;
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}
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static struct normalized_coords
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accelerator_filter_post_normalized(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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void *data, uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *) filter;
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struct device_float_coords accelerated;
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/* Accelerate for device units, normalize afterwards */
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accelerated = accelerator_filter_generic(filter,
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unaccelerated,
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data,
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time);
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return normalize_for_dpi(&accelerated, accel->dpi);
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}
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static bool
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touchpad_accelerator_set_speed(struct motion_filter *filter,
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double speed_adjustment)
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{
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struct pointer_accelerator *accel_filter =
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(struct pointer_accelerator *)filter;
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assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
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/* Note: the numbers below are nothing but trial-and-error magic,
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don't read more into them other than "they mostly worked ok" */
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/* adjust when accel kicks in */
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accel_filter->threshold = TOUCHPAD_DEFAULT_THRESHOLD -
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TOUCHPAD_THRESHOLD_RANGE * speed_adjustment;
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accel_filter->accel = TOUCHPAD_ACCELERATION;
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accel_filter->incline = TOUCHPAD_INCLINE;
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filter->speed_adjustment = speed_adjustment;
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return true;
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}
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static struct normalized_coords
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touchpad_constant_filter(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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void *data, uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *)filter;
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struct normalized_coords normalized;
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normalized = normalize_for_dpi(unaccelerated, accel->dpi);
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normalized.x = TP_MAGIC_SLOWDOWN * normalized.x;
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normalized.y = TP_MAGIC_SLOWDOWN * normalized.y;
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return normalized;
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}
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static void
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touchpad_accelerator_restart(struct motion_filter *filter,
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void *data,
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uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *) filter;
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reset_trackers(&accel->trackers, time);
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}
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static void
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touchpad_accelerator_destroy(struct motion_filter *filter)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *) filter;
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free_trackers(&accel->trackers);
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free(accel);
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}
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double
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touchpad_accel_profile_linear(struct motion_filter *filter,
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void *data,
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double speed_in, /* in device units/µs */
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uint64_t time)
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{
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struct pointer_accelerator *accel_filter =
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(struct pointer_accelerator *)filter;
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const double max_accel = accel_filter->accel; /* unitless factor */
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const double threshold = accel_filter->threshold; /* units/us */
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const double incline = accel_filter->incline;
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double factor; /* unitless */
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/* Convert to mm/s because that's something one can understand */
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speed_in = v_us2s(speed_in) * 25.4/accel_filter->dpi;
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/*
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Our acceleration function calculates a factor to accelerate input
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deltas with. The function is a double incline with a plateau,
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with a rough shape like this:
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accel
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factor
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^
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| /
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| _____/
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| /
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|/
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+-------------> speed in
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The two inclines are linear functions in the form
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y = ax + b
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where y is speed_out
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x is speed_in
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a is the incline of acceleration
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b is minimum acceleration factor
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for speeds up to the lower threshold, we decelerate, down to 30%
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of input speed.
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hence 1 = a * 7 + 0.3
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0.7 = a * 7 => a := 0.1
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deceleration function is thus:
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y = 0.1x + 0.3
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Note:
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* The minimum threshold is a result of trial-and-error and
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has no other intrinsic meaning.
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* 0.3 is chosen simply because it is above the Nyquist frequency
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for subpixel motion within a pixel.
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*/
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if (speed_in < 7.0) {
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factor = 0.1 * speed_in + 0.3;
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/* up to the threshold, we keep factor 1, i.e. 1:1 movement */
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} else if (speed_in < threshold) {
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factor = 1;
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} else {
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/* Acceleration function above the threshold:
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y = ax' + b
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where T is threshold
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x is speed_in
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x' is speed
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and
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y(T) == 1
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hence 1 = ax' + 1
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=> x' := (x - T)
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*/
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factor = incline * (speed_in - threshold) + 1;
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}
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/* Cap at the maximum acceleration factor */
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factor = min(max_accel, factor);
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/* Scale everything depending on the acceleration set */
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factor *= 1 + 0.5 * filter->speed_adjustment;
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return factor * TP_MAGIC_SLOWDOWN;
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}
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static struct pointer_accelerator *
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create_default_filter(int dpi)
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{
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struct pointer_accelerator *filter;
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filter = zalloc(sizeof *filter);
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filter->last_velocity = 0.0;
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init_trackers(&filter->trackers, NUM_POINTER_TRACKERS);
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filter->threshold = DEFAULT_THRESHOLD;
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filter->accel = DEFAULT_ACCELERATION;
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filter->incline = DEFAULT_INCLINE;
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filter->dpi = dpi;
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return filter;
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}
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struct motion_filter_interface accelerator_interface_touchpad = {
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.type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
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.filter = accelerator_filter_post_normalized,
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.filter_constant = touchpad_constant_filter,
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.restart = touchpad_accelerator_restart,
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.destroy = touchpad_accelerator_destroy,
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.set_speed = touchpad_accelerator_set_speed,
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};
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struct motion_filter *
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create_pointer_accelerator_filter_touchpad(int dpi,
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uint64_t event_delta_smooth_threshold,
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uint64_t event_delta_smooth_value)
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{
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struct pointer_accelerator *filter;
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struct pointer_delta_smoothener *smoothener;
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filter = create_default_filter(dpi);
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if (!filter)
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return NULL;
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filter->base.interface = &accelerator_interface_touchpad;
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filter->profile = touchpad_accel_profile_linear;
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smoothener = zalloc(sizeof(*smoothener));
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smoothener->threshold = event_delta_smooth_threshold,
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smoothener->value = event_delta_smooth_value,
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filter->trackers.smoothener = smoothener;
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return &filter->base;
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}
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177
src/filter.c
177
src/filter.c
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@ -36,12 +36,6 @@
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#include "libinput-util.h"
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#include "filter-private.h"
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/* Once normalized, touchpads see the same acceleration as mice. that is
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* technically correct but subjectively wrong, we expect a touchpad to be a
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* lot slower than a mouse. Apply a magic factor to slow down all movements
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*/
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#define TP_MAGIC_SLOWDOWN 0.37 /* unitless factor */
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struct normalized_coords
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filter_dispatch(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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@ -103,12 +97,6 @@ filter_get_type(struct motion_filter *filter)
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#define DEFAULT_ACCELERATION 2.0 /* unitless factor */
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#define DEFAULT_INCLINE 1.1 /* unitless factor */
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/* Touchpad acceleration */
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#define TOUCHPAD_DEFAULT_THRESHOLD 254 /* mm/s */
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#define TOUCHPAD_THRESHOLD_RANGE 184 /* mm/s */
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#define TOUCHPAD_ACCELERATION 9.0 /* unitless factor */
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#define TOUCHPAD_INCLINE 0.011 /* unitless factor */
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/*
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* Pointer acceleration filter constants
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*/
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@ -395,23 +383,6 @@ accelerator_filter_generic(struct motion_filter *filter,
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return accelerated;
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}
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static struct normalized_coords
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accelerator_filter_post_normalized(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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void *data, uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *) filter;
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struct device_float_coords accelerated;
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/* Accelerate for device units, normalize afterwards */
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accelerated = accelerator_filter_generic(filter,
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unaccelerated,
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data,
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time);
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return normalize_for_dpi(&accelerated, accel->dpi);
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}
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static struct normalized_coords
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accelerator_filter_pre_normalized(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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@ -478,44 +449,6 @@ accelerator_filter_noop(struct motion_filter *filter,
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return normalize_for_dpi(unaccelerated, accel->dpi);
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}
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static bool
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touchpad_accelerator_set_speed(struct motion_filter *filter,
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double speed_adjustment)
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{
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struct pointer_accelerator *accel_filter =
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(struct pointer_accelerator *)filter;
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assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
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/* Note: the numbers below are nothing but trial-and-error magic,
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don't read more into them other than "they mostly worked ok" */
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/* adjust when accel kicks in */
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accel_filter->threshold = TOUCHPAD_DEFAULT_THRESHOLD -
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TOUCHPAD_THRESHOLD_RANGE * speed_adjustment;
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accel_filter->accel = TOUCHPAD_ACCELERATION;
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accel_filter->incline = TOUCHPAD_INCLINE;
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filter->speed_adjustment = speed_adjustment;
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return true;
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}
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static struct normalized_coords
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touchpad_constant_filter(struct motion_filter *filter,
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const struct device_float_coords *unaccelerated,
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void *data, uint64_t time)
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{
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struct pointer_accelerator *accel =
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(struct pointer_accelerator *)filter;
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struct normalized_coords normalized;
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normalized = normalize_for_dpi(unaccelerated, accel->dpi);
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normalized.x = TP_MAGIC_SLOWDOWN * normalized.x;
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normalized.y = TP_MAGIC_SLOWDOWN * normalized.y;
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return normalized;
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}
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static void
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accelerator_restart(struct motion_filter *filter,
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void *data,
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@ -684,84 +617,6 @@ pointer_accel_profile_linear(struct motion_filter *filter,
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return factor;
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}
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double
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touchpad_accel_profile_linear(struct motion_filter *filter,
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void *data,
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double speed_in, /* in device units/µs */
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uint64_t time)
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{
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struct pointer_accelerator *accel_filter =
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(struct pointer_accelerator *)filter;
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const double max_accel = accel_filter->accel; /* unitless factor */
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const double threshold = accel_filter->threshold; /* units/us */
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const double incline = accel_filter->incline;
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double factor; /* unitless */
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/* Convert to mm/s because that's something one can understand */
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speed_in = v_us2s(speed_in) * 25.4/accel_filter->dpi;
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|
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/*
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Our acceleration function calculates a factor to accelerate input
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deltas with. The function is a double incline with a plateau,
|
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with a rough shape like this:
|
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|
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accel
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factor
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^
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| /
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| _____/
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| /
|
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|/
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+-------------> speed in
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|
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The two inclines are linear functions in the form
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y = ax + b
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where y is speed_out
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x is speed_in
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a is the incline of acceleration
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b is minimum acceleration factor
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|
||||
for speeds up to the lower threshold, we decelerate, down to 30%
|
||||
of input speed.
|
||||
hence 1 = a * 7 + 0.3
|
||||
0.7 = a * 7 => a := 0.1
|
||||
deceleration function is thus:
|
||||
y = 0.1x + 0.3
|
||||
|
||||
Note:
|
||||
* The minimum threshold is a result of trial-and-error and
|
||||
has no other intrinsic meaning.
|
||||
* 0.3 is chosen simply because it is above the Nyquist frequency
|
||||
for subpixel motion within a pixel.
|
||||
*/
|
||||
if (speed_in < 7.0) {
|
||||
factor = 0.1 * speed_in + 0.3;
|
||||
/* up to the threshold, we keep factor 1, i.e. 1:1 movement */
|
||||
} else if (speed_in < threshold) {
|
||||
factor = 1;
|
||||
} else {
|
||||
/* Acceleration function above the threshold:
|
||||
y = ax' + b
|
||||
where T is threshold
|
||||
x is speed_in
|
||||
x' is speed
|
||||
and
|
||||
y(T) == 1
|
||||
hence 1 = ax' + 1
|
||||
=> x' := (x - T)
|
||||
*/
|
||||
factor = incline * (speed_in - threshold) + 1;
|
||||
}
|
||||
|
||||
/* Cap at the maximum acceleration factor */
|
||||
factor = min(max_accel, factor);
|
||||
|
||||
/* Scale everything depending on the acceleration set */
|
||||
factor *= 1 + 0.5 * filter->speed_adjustment;
|
||||
|
||||
return factor * TP_MAGIC_SLOWDOWN;
|
||||
}
|
||||
|
||||
struct motion_filter_interface accelerator_interface = {
|
||||
.type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
|
||||
.filter = accelerator_filter_pre_normalized,
|
||||
|
|
@ -828,38 +683,6 @@ create_pointer_accelerator_filter_linear_low_dpi(int dpi)
|
|||
return &filter->base;
|
||||
}
|
||||
|
||||
struct motion_filter_interface accelerator_interface_touchpad = {
|
||||
.type = LIBINPUT_CONFIG_ACCEL_PROFILE_ADAPTIVE,
|
||||
.filter = accelerator_filter_post_normalized,
|
||||
.filter_constant = touchpad_constant_filter,
|
||||
.restart = accelerator_restart,
|
||||
.destroy = accelerator_destroy,
|
||||
.set_speed = touchpad_accelerator_set_speed,
|
||||
};
|
||||
|
||||
struct motion_filter *
|
||||
create_pointer_accelerator_filter_touchpad(int dpi,
|
||||
uint64_t event_delta_smooth_threshold,
|
||||
uint64_t event_delta_smooth_value)
|
||||
{
|
||||
struct pointer_accelerator *filter;
|
||||
struct pointer_delta_smoothener *smoothener;
|
||||
|
||||
filter = create_default_filter(dpi);
|
||||
if (!filter)
|
||||
return NULL;
|
||||
|
||||
filter->base.interface = &accelerator_interface_touchpad;
|
||||
filter->profile = touchpad_accel_profile_linear;
|
||||
|
||||
smoothener = zalloc(sizeof(*smoothener));
|
||||
smoothener->threshold = event_delta_smooth_threshold,
|
||||
smoothener->value = event_delta_smooth_value,
|
||||
filter->trackers.smoothener = smoothener;
|
||||
|
||||
return &filter->base;
|
||||
}
|
||||
|
||||
static struct normalized_coords
|
||||
accelerator_filter_flat(struct motion_filter *filter,
|
||||
const struct device_float_coords *unaccelerated,
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue