qmk_firmware/users/drashna/pointing/pointing.c

// Copyright 2021 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
// SPDX-License-Identifier: GPL-2.0-or-later

#include "pointing.h"
#include "math.h"

static uint16_t mouse_debounce_timer = 0;
bool            enable_acceleration  = false;

#ifdef TAPPING_TERM_PER_KEY
#    define TAP_CHECK get_tapping_term(KC_BTN1, NULL)
#else
#    ifndef TAPPING_TERM
#        define TAPPING_TERM 200
#    endif
#    define TAP_CHECK TAPPING_TERM
#endif

__attribute__((weak)) void pointing_device_init_keymap(void) {}

void pointing_device_init_user(void) {
    set_auto_mouse_layer(_MOUSE);
    set_auto_mouse_enable(true);

    pointing_device_init_keymap();
}

__attribute__((weak)) report_mouse_t pointing_device_task_keymap(report_mouse_t mouse_report) {
    return mouse_report;
}

report_mouse_t pointing_device_task_user(report_mouse_t mouse_report) {
    mouse_xy_report_t x = mouse_report.x, y = mouse_report.y;
    mouse_report.x = 0;
    mouse_report.y = 0;

    if (x != 0 && y != 0 && (timer_elapsed(mouse_debounce_timer) > TAP_CHECK)) {
#ifdef OLED_ENABLE
        oled_timer_reset();
#endif
        if (enable_acceleration) {
            x = (mouse_xy_report_t)(x > 0 ? pow(4, x) / 2 + x : -pow(4, abs(x)) / 2 + x);
            y = (mouse_xy_report_t)(y > 0 ? pow(5, y) / 2 + y : -pow(5, abs(y)) / 2 + y);
//            x = (mouse_xy_report_t)(x > 0 ? x * x / 16 + x : -x * x / 16 + x);
//            y = (mouse_xy_report_t)(y > 0 ? y * y / 16 + y : -y * y / 16 + y);
        }
        mouse_report.x = x;
        mouse_report.y = y;
    }

    return pointing_device_task_keymap(mouse_report);
}

bool process_record_pointing(uint16_t keycode, keyrecord_t* record) {
    switch (keycode) {
        case KC_ACCEL:
            enable_acceleration = record->event.pressed;
            break;
        default:
            mouse_debounce_timer  = timer_read();
            break;
    }
    return true;
}

layer_state_t layer_state_set_pointing(layer_state_t state) {
    if (layer_state_cmp(state, _GAMEPAD) || layer_state_cmp(state, _DIABLO) || layer_state_cmp(state, _DIABLOII)) {
        state |= ((layer_state_t)1 << _MOUSE);
        set_auto_mouse_enable(false); // auto mouse can be disabled any time during run time
    } else {
        set_auto_mouse_enable(true);
    }
    return state;
}


#if defined(POINTING_DEVICE_AUTO_MOUSE_ENABLE)
__attribute__((weak)) bool is_mouse_record_keymap(uint16_t keycode, keyrecord_t *record) { return false; }

bool is_mouse_record_user(uint16_t keycode, keyrecord_t* record) {
    if (is_mouse_record_keymap(keycode, record)) {
        return true;
    }
    switch (keycode) {
#    if defined(KEYBOARD_ploopy)
        case DPI_CONFIG:
#    elif (defined(KEYBOARD_bastardkb_charybdis) || defined(KEYBOARD_handwired_tractyl_manuform)) && !defined(NO_CHARYBDIS_KEYCODES) || (defined(KEYBOARD_bastardkb_dilemma) && !defined(NO_DILEMMA_KEYCODES))
        case QK_KB ... QK_KB_MAX:
#    endif
        case KC_ACCEL:
            return true;
    }
    return false;
}
#endif