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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 "filter.h"
#include "libinput-util.h"
#include "filter-private.h"
struct tablet_accelerator_flat {
struct motion_filter base;
double factor;
int xres, yres;
double xres_scale, /* 1000dpi : tablet res */
yres_scale; /* 1000dpi : tablet res */
};
struct trackpoint_accelerator {
struct motion_filter base;
struct device_float_coords history[4];
size_t history_size;
double scale_factor;
double max_accel;
double max_delta;
double incline; /* incline of the function */
double offset; /* offset of the function */
};
static inline struct normalized_coords
tablet_accelerator_filter_flat_mouse(struct tablet_accelerator_flat *filter,
const struct device_float_coords *units)
{
struct normalized_coords accelerated;
/*
Tablets are high res (Intuos 4 is 5080 dpi) and unmodified deltas
are way too high. Slow it down to the equivalent of a 1000dpi
mouse. The ratio of that is:
ratio = 1000/(resolution_per_mm * 25.4)
i.e. on the Intuos4 it's a ratio of ~1/5.
*/
accelerated.x = units->x * filter->xres_scale;
accelerated.y = units->y * filter->yres_scale;
accelerated.x *= filter->factor;
accelerated.y *= filter->factor;
return accelerated;
}
static struct normalized_coords
tablet_accelerator_filter_flat_pen(struct tablet_accelerator_flat *filter,
const struct device_float_coords *units)
{
struct normalized_coords accelerated;
/* Tablet input is in device units, output is supposed to be in
* logical pixels roughly equivalent to a mouse/touchpad.
*
* This is a magical constant found by trial and error. On a 96dpi
* screen 0.4mm of movement correspond to 1px logical pixel which
* is almost identical to the tablet mapped to screen in absolute
* mode. Tested on a Intuos5, other tablets may vary.
*/
const double DPI_CONVERSION = 96.0/25.4 * 2.5; /* unitless factor */
struct normalized_coords mm;
mm.x = 1.0 * units->x/filter->xres;
mm.y = 1.0 * units->y/filter->yres;
accelerated.x = mm.x * filter->factor * DPI_CONVERSION;
accelerated.y = mm.y * filter->factor * DPI_CONVERSION;
return accelerated;
}
static struct normalized_coords
tablet_accelerator_filter_flat(struct motion_filter *filter,
const struct device_float_coords *units,
void *data, uint64_t time)
{
struct tablet_accelerator_flat *accel_filter =
(struct tablet_accelerator_flat *)filter;
struct libinput_tablet_tool *tool = (struct libinput_tablet_tool*)data;
enum libinput_tablet_tool_type type;
struct normalized_coords accel;
type = libinput_tablet_tool_get_type(tool);
switch (type) {
case LIBINPUT_TABLET_TOOL_TYPE_MOUSE:
case LIBINPUT_TABLET_TOOL_TYPE_LENS:
accel = tablet_accelerator_filter_flat_mouse(accel_filter,
units);
break;
default:
accel = tablet_accelerator_filter_flat_pen(accel_filter,
units);
break;
}
return accel;
}
static bool
tablet_accelerator_set_speed(struct motion_filter *filter,
double speed_adjustment)
{
struct tablet_accelerator_flat *accel_filter =
(struct tablet_accelerator_flat *)filter;
assert(speed_adjustment >= -1.0 && speed_adjustment <= 1.0);
accel_filter->factor = speed_adjustment + 1.0;
return true;
}
static void
tablet_accelerator_destroy(struct motion_filter *filter)
{
struct tablet_accelerator_flat *accel_filter =
(struct tablet_accelerator_flat *)filter;
free(accel_filter);
}
struct motion_filter_interface accelerator_interface_tablet = {
.type = LIBINPUT_CONFIG_ACCEL_PROFILE_FLAT,
.filter = tablet_accelerator_filter_flat,
.filter_constant = NULL,
.restart = NULL,
.destroy = tablet_accelerator_destroy,
.set_speed = tablet_accelerator_set_speed,
};
static struct tablet_accelerator_flat *
create_tablet_filter_flat(int xres, int yres)
{
struct tablet_accelerator_flat *filter;
filter = zalloc(sizeof *filter);
filter->factor = 1.0;
filter->xres = xres;
filter->yres = yres;
filter->xres_scale = DEFAULT_MOUSE_DPI/(25.4 * xres);
filter->yres_scale = DEFAULT_MOUSE_DPI/(25.4 * yres);
return filter;
}
struct motion_filter *
create_pointer_accelerator_filter_tablet(int xres, int yres)
{
struct tablet_accelerator_flat *filter;
filter = create_tablet_filter_flat(xres, yres);
if (!filter)
return NULL;
filter->base.interface = &accelerator_interface_tablet;
return &filter->base;
}
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