libinput/src/util-input-event.h

/*
 * Copyright © 2019 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.
 */

#pragma once

#include "config.h"

#include <libevdev/libevdev.h>
#include <linux/input.h>
#include <stdbool.h>
#include <string.h>

#include "util-mem.h"
#include "util-newtype.h"
#include "util-time.h"

static inline struct input_event
input_event_init(usec_t time, unsigned int type, unsigned int code, int value)
{
	struct input_event ev;
	struct timeval tval = usec_to_timeval(time);

	ev.input_event_sec = tval.tv_sec;
	ev.input_event_usec = tval.tv_usec;
	ev.type = type;
	ev.code = code;
	ev.value = value;

	return ev;
}

static inline usec_t
input_event_time(const struct input_event *e)
{
	struct timeval tval;

	tval.tv_sec = e->input_event_sec;
	tval.tv_usec = e->input_event_usec;

	return usec_from_timeval(&tval);
}

static inline void
input_event_set_time(struct input_event *e, usec_t time)
{
	struct timeval tval = usec_to_timeval(time);

	e->input_event_sec = tval.tv_sec;
	e->input_event_usec = tval.tv_usec;
}

static inline double
absinfo_range(const struct input_absinfo *abs)
{
	return (double)(abs->maximum - abs->minimum + 1);
}

static inline double
absinfo_normalize_value(const struct input_absinfo *abs, int value)
{
	return min(1.0,
		   max(0.0,
		       (double)(value - abs->minimum) / (abs->maximum - abs->minimum)));
}

static inline double
absinfo_normalize(const struct input_absinfo *abs)
{
	return absinfo_normalize_value(abs, abs->value);
}

static inline double
absinfo_scale_axis(const struct input_absinfo *absinfo, double val, double to_range)
{
	return (val - absinfo->minimum) * to_range / absinfo_range(absinfo);
}

static inline double
absinfo_convert_to_mm(const struct input_absinfo *absinfo, double v)
{
	double value = v - absinfo->minimum;
	return value / absinfo->resolution;
}