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99334e11bf
libinput applies averaging to the velocity of most pointer devices. Averaging the velocity makes the motion look smooth and may be of benefit to bad input devices. For good devices, however, it comes at the unfortunate price of decreased accuaracy. This change turns velocity averaging off by default (sets ntrackers to 2 instead of 16) and allows for it to be turned back on via a quirk, for bad devices which require it.
130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/*
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* Copyright © 2012 Jonas Ådahl
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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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#ifndef FILTER_PRIVATE_H
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#define FILTER_PRIVATE_H
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#include "config.h"
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#include "filter.h"
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struct motion_filter_interface {
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enum libinput_config_accel_profile type;
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struct normalized_coords (*filter)(
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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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struct normalized_coords (*filter_constant)(
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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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void (*restart)(struct motion_filter *filter,
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void *data,
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uint64_t time);
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void (*destroy)(struct motion_filter *filter);
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bool (*set_speed)(struct motion_filter *filter,
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double speed_adjustment);
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};
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struct motion_filter {
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double speed_adjustment; /* normalized [-1, 1] */
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struct motion_filter_interface *interface;
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};
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struct pointer_tracker {
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struct device_float_coords delta; /* delta to most recent event */
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uint64_t time; /* us */
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uint32_t dir;
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};
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/* For smoothing timestamps from devices with unreliable timing */
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struct pointer_delta_smoothener {
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uint64_t threshold;
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uint64_t value;
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};
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struct pointer_trackers {
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struct pointer_tracker *trackers;
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size_t ntrackers;
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unsigned int cur_tracker;
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struct pointer_delta_smoothener *smoothener;
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};
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void trackers_init(struct pointer_trackers *trackers, int ntrackers);
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void trackers_free(struct pointer_trackers *trackers);
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void
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trackers_reset(struct pointer_trackers *trackers,
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uint64_t time);
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void
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trackers_feed(struct pointer_trackers *trackers,
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const struct device_float_coords *delta,
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uint64_t time);
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struct pointer_tracker *
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trackers_by_offset(struct pointer_trackers *trackers, unsigned int offset);
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double
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trackers_velocity(struct pointer_trackers *trackers, uint64_t time);
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double
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calculate_acceleration_simpsons(struct motion_filter *filter,
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accel_profile_func_t profile,
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void *data,
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double velocity,
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double last_velocity,
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uint64_t time);
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/* Convert speed/velocity from units/us to units/ms */
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static inline double
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v_us2ms(double units_per_us)
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{
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return units_per_us * 1000.0;
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}
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static inline double
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v_us2s(double units_per_us)
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{
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return units_per_us * 1000000.0;
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}
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/* Convert speed/velocity from units/ms to units/us */
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static inline double
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v_ms2us(double units_per_ms)
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{
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return units_per_ms/1000.0;
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}
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static inline struct normalized_coords
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normalize_for_dpi(const struct device_float_coords *coords, int dpi)
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{
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struct normalized_coords norm;
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norm.x = coords->x * DEFAULT_MOUSE_DPI/dpi;
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norm.y = coords->y * DEFAULT_MOUSE_DPI/dpi;
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return norm;
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}
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#endif
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