mirror of
https://gitlab.freedesktop.org/libinput/libinput.git
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125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/*
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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 "filter.h"
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#include "libinput-util.h"
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#include "filter-private.h"
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#define TP_MAGIC_SLOWDOWN_FLAT 0.2968
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struct touchpad_accelerator_flat {
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struct motion_filter base;
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double factor;
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int dpi;
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};
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static struct normalized_coords
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accelerator_filter_touchpad_flat(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 touchpad_accelerator_flat *accel_filter =
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(struct touchpad_accelerator_flat *)filter;
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double factor; /* unitless factor */
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struct normalized_coords accelerated;
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/* You want flat acceleration, you get flat acceleration for the
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* device */
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factor = accel_filter->factor;
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accelerated.x = TP_MAGIC_SLOWDOWN_FLAT * factor * unaccelerated->x;
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accelerated.y = TP_MAGIC_SLOWDOWN_FLAT * factor * 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_noop_touchpad_flat(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 touchpad_accelerator_flat *accel =
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(struct touchpad_accelerator_flat *) 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_FLAT * normalized.x;
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normalized.y = TP_MAGIC_SLOWDOWN_FLAT * normalized.y;
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return normalized;
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}
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static bool
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accelerator_set_speed_touchpad_flat(struct motion_filter *filter,
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double speed_adjustment)
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{
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struct touchpad_accelerator_flat *accel_filter =
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(struct touchpad_accelerator_flat *)filter;
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assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
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accel_filter->factor = max(0.005, 1 + speed_adjustment);
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filter->speed_adjustment = speed_adjustment;
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return true;
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}
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static void
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accelerator_destroy_touchpad_flat(struct motion_filter *filter)
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{
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struct touchpad_accelerator_flat *accel =
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(struct touchpad_accelerator_flat *) filter;
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free(accel);
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}
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struct motion_filter_interface accelerator_interface_touchpad_flat = {
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.type = LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT,
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.filter = accelerator_filter_touchpad_flat,
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.filter_constant = accelerator_filter_noop_touchpad_flat,
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.restart = NULL,
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.destroy = accelerator_destroy_touchpad_flat,
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.set_speed = accelerator_set_speed_touchpad_flat,
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};
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struct motion_filter *
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create_pointer_accelerator_filter_touchpad_flat(int dpi)
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{
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struct touchpad_accelerator_flat *filter;
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filter = zalloc(sizeof *filter);
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filter->base.interface = &accelerator_interface_touchpad_flat;
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filter->dpi = dpi;
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return &filter->base;
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}
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