qmk_firmware/quantum/pointing_device/pointing_device_gestures.h

/* Copyright 2022 Daniel Kao <daniel.m.kao@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once

#include <stdint.h>
#include "report.h"

#ifdef POINTING_DEVICE_GESTURES_CURSOR_GLIDE_ENABLE
typedef struct {
    mouse_xy_report_t dx;
    mouse_xy_report_t dy;
    bool              valid;
} cursor_glide_t;

typedef struct {
    uint16_t trigger_px; /* Pixels of movement needed to trigger cursor glide */
    uint16_t coef;       /* Coefficient of friction */
    uint16_t interval;   /* Glide report interval, in milliseconds */
} cursor_glide_config_t;

typedef struct {
    int32_t           v0;
    int32_t           x;
    int32_t           y;
    uint16_t          z;
    uint16_t          timer;
    uint16_t          counter;
    mouse_xy_report_t dx0;
    mouse_xy_report_t dy0;
} cursor_glide_status_t;

typedef struct {
    cursor_glide_config_t config;
    cursor_glide_status_t status;
} cursor_glide_context_t;

/* Check glide report conditions, calculates glide coordinates */
cursor_glide_t cursor_glide_check(cursor_glide_context_t* glide);

/* Start glide reporting, gives first set of glide coordinates */
cursor_glide_t cursor_glide_start(cursor_glide_context_t* glide);

/* Update glide engine on the latest cursor movement, cursor glide is based on the final movement */
void cursor_glide_update(cursor_glide_context_t* glide, mouse_xy_report_t dx, mouse_xy_report_t dy, uint16_t z);
#endif