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/*
* Copyright © 2006-2009 Simon Thum
* Copyright © 2012 Jonas Ådahl
* Copyright © 2014-2015 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 <limits.h>
#include <math.h>
#include "filter.h"
#include "libinput-util.h"
#include "filter-private.h"
struct pointer_accelerator_flat {
struct motion_filter base;
double factor;
int dpi;
};
static struct normalized_coords
accelerator_filter_flat(struct motion_filter *filter,
const struct device_float_coords *unaccelerated,
void *data, uint64_t time)
{
struct pointer_accelerator_flat *accel_filter =
(struct pointer_accelerator_flat *)filter;
double factor; /* unitless factor */
struct normalized_coords accelerated;
/* You want flat acceleration, you get flat acceleration for the
* device */
factor = accel_filter->factor;
accelerated.x = factor * unaccelerated->x;
accelerated.y = factor * unaccelerated->y;
return accelerated;
}
static struct normalized_coords
accelerator_filter_noop_flat(struct motion_filter *filter,
const struct device_float_coords *unaccelerated,
void *data, uint64_t time)
{
struct pointer_accelerator_flat *accel =
(struct pointer_accelerator_flat *) filter;
return normalize_for_dpi(unaccelerated, accel->dpi);
}
static bool
accelerator_set_speed_flat(struct motion_filter *filter,
double speed_adjustment)
{
struct pointer_accelerator_flat *accel_filter =
(struct pointer_accelerator_flat *)filter;
assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
/* Speed rage is 0-200% of the nominal speed, with 0 mapping to the
* nominal speed. Anything above 200 is pointless, we're already
* skipping over ever second pixel at 200% speed.
*/
accel_filter->factor = max(0.005, 1 + speed_adjustment);
filter->speed_adjustment = speed_adjustment;
return true;
}
static void
accelerator_destroy_flat(struct motion_filter *filter)
{
struct pointer_accelerator_flat *accel =
(struct pointer_accelerator_flat *) filter;
free(accel);
}
struct motion_filter_interface accelerator_interface_flat = {
.type = LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT,
.filter = accelerator_filter_flat,
.filter_constant = accelerator_filter_noop_flat,
.restart = NULL,
.destroy = accelerator_destroy_flat,
.set_speed = accelerator_set_speed_flat,
};
struct motion_filter *
create_pointer_accelerator_filter_flat(int dpi)
{
struct pointer_accelerator_flat *filter;
filter = zalloc(sizeof *filter);
filter->base.interface = &accelerator_interface_flat;
filter->dpi = dpi;
return &filter->base;
}
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