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/* Copyright 2020 Christopher Courtney, aka Drashna Jael're (@drashna) <drashna@live.com>
* 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/>.
*/
#include <stdlib.h>
#include <lib/lib8tion/lib8tion.h>
#include "cirque_pinnacle_gestures.h"
#include "pointing_device.h"
#include "timer.h"
#include "wait.h"
#if defined(SPLIT_POINTING_ENABLE) && defined(POINTING_DEVICE_COMBINED)
# include "keyboard.h"
#endif
#if (defined(CIRQUE_PINNACLE_TAP_ENABLE) || defined(CIRQUE_PINNACLE_CIRCULAR_SCROLL_ENABLE)) && CIRQUE_PINNACLE_POSITION_MODE
static cirque_pinnacle_features_t features = {.tap_enable = true, .circular_scroll_enable = true};
#endif
#if defined(CIRQUE_PINNACLE_TAP_ENABLE) && CIRQUE_PINNACLE_POSITION_MODE
static trackpad_tap_context_t tap;
static report_mouse_t trackpad_tap(report_mouse_t mouse_report, pinnacle_data_t touchData) {
if (touchData.touchDown != tap.touchDown) {
tap.touchDown = touchData.touchDown;
if (!touchData.zValue) {
if (timer_elapsed(tap.timer) < CIRQUE_PINNACLE_TAPPING_TERM && tap.timer != 0) {
mouse_report.buttons = pointing_device_handle_buttons(mouse_report.buttons, true, POINTING_DEVICE_BUTTON1);
}
}
tap.timer = timer_read();
}
if (timer_elapsed(tap.timer) > (CIRQUE_PINNACLE_TOUCH_DEBOUNCE)) {
tap.timer = 0;
}
return mouse_report;
}
void cirque_pinnacle_enable_tap(bool enable) {
features.tap_enable = enable;
}
#endif
#ifdef CIRQUE_PINNACLE_CIRCULAR_SCROLL_ENABLE
# if !CIRQUE_PINNACLE_POSITION_MODE
# error "Circular scroll is not supported in relative mode"
# endif
/* To set a trackpad exclusively as scroll wheel: outer_ring_pct = 100, trigger_px = 0, trigger_ang = 0 */
static circular_scroll_context_t scroll = {.config = {.outer_ring_pct = 33,
.trigger_px = 16,
.trigger_ang = 9102, /* 50 degrees */
.wheel_clicks = 18}};
static inline uint16_t atan2_16(int32_t dy, int32_t dx) {
if (dy == 0) {
if (dx >= 0) {
return 0;
} else {
return 32768;
}
}
int32_t abs_y = dy > 0 ? dy : -dy;
int16_t a;
if (dx >= 0) {
a = 8192 - (8192 * (dx - abs_y) / (dx + abs_y));
} else {
a = 24576 - (8192 * (dx + abs_y) / (abs_y - dx));
}
if (dy < 0) {
return -a; // negate if in quad III or IV
}
return a;
}
static circular_scroll_t circular_scroll(pinnacle_data_t touchData) {
circular_scroll_t report = {0, 0, false};
int8_t x, y, wheel_clicks;
uint8_t center = INT8_MAX, mag;
int16_t ang, dot, det, opposite_side, adjacent_side;
uint16_t scale = cirque_pinnacle_get_scale();
if (touchData.zValue) {
/*
* Place origin at center of trackpad, treat coordinates as vectors.
* Scale to +/-INT8_MAX; angles are independent of resolution.
*/
if (scale) {
/* Rotate coordinates into a consistent orientation */
report_mouse_t rot = {.x = (int8_t)((int32_t)touchData.xValue * INT8_MAX * 2 / scale - center), .y = (int8_t)((int32_t)touchData.yValue * INT8_MAX * 2 / scale - center)};
# if defined(SPLIT_POINTING_ENABLE) && defined(POINTING_DEVICE_COMBINED)
if (!is_keyboard_left()) {
rot = pointing_device_adjust_by_defines_right(rot);
} else
# endif
{
rot = pointing_device_adjust_by_defines(rot);
}
x = rot.x;
y = rot.y;
} else {
x = 0;
y = 0;
}
/* Check if first touch */
if (!scroll.z) {
report.suppress_touch = false;
/* Check if touch falls within outer ring */
mag = sqrt16(x * x + y * y);
if (mag * 100 / center >= 100 - scroll.config.outer_ring_pct) {
scroll.state = SCROLL_DETECTING;
scroll.x = x;
scroll.y = y;
scroll.mag = mag;
/*
* Decide scroll axis:
* Vertical if started from righ half
* Horizontal if started from left half
* Flipped for left-handed
*/
scroll.axis = x < 0;
}
} else if (scroll.state == SCROLL_DETECTING) {
report.suppress_touch = true;
/* Already detecting scroll, check movement from touchdown location */
mag = sqrt16((x - scroll.x) * (x - scroll.x) + (y - scroll.y) * (y - scroll.y));
if (mag >= scroll.config.trigger_px) {
/*
* Find angle of movement.
* 0 degrees here means movement towards center of circle
*/
dot = scroll.x * x + scroll.y * y;
det = scroll.x * y - scroll.y * x;
opposite_side = abs(det); /* Based on scalar rejection */
adjacent_side = abs(scroll.mag * scroll.mag - abs(dot)); /* Based on scalar projection */
ang = (int16_t)atan2_16(opposite_side, adjacent_side);
if (ang < scroll.config.trigger_ang) {
/* Not a scroll, release coordinates */
report.suppress_touch = false;
scroll.state = NOT_SCROLL;
} else {
/* Scroll detected */
scroll.state = SCROLL_VALID;
}
}
}
if (scroll.state == SCROLL_VALID) {
report.suppress_touch = true;
dot = scroll.x * x + scroll.y * y;
det = scroll.x * y - scroll.y * x;
ang = (int16_t)atan2_16(det, dot);
wheel_clicks = ((int32_t)ang * scroll.config.wheel_clicks) / 65536;
if (wheel_clicks >= 1 || wheel_clicks <= -1) {
if (scroll.config.left_handed) {
if (scroll.axis == 0) {
report.h = -wheel_clicks;
} else {
report.v = wheel_clicks;
}
} else {
if (scroll.axis == 0) {
report.v = -wheel_clicks;
} else {
report.h = wheel_clicks;
}
}
scroll.x = x;
scroll.y = y;
}
}
}
scroll.z = touchData.zValue;
if (!scroll.z) scroll.state = SCROLL_UNINITIALIZED;
return report;
}
void cirque_pinnacle_enable_circular_scroll(bool enable) {
features.circular_scroll_enable = enable;
}
void cirque_pinnacle_configure_circular_scroll(uint8_t outer_ring_pct, uint8_t trigger_px, uint16_t trigger_ang, uint8_t wheel_clicks, bool left_handed) {
scroll.config.outer_ring_pct = outer_ring_pct;
scroll.config.trigger_px = trigger_px;
scroll.config.trigger_ang = trigger_ang;
scroll.config.wheel_clicks = wheel_clicks;
scroll.config.left_handed = left_handed;
}
#endif
bool cirque_pinnacle_gestures(report_mouse_t* mouse_report, pinnacle_data_t touchData) {
bool suppress_mouse_update = false;
#ifdef CIRQUE_PINNACLE_CIRCULAR_SCROLL_ENABLE
# if !CIRQUE_PINNACLE_POSITION_MODE
# error "Circular scroll is not supported in relative mode"
# endif
circular_scroll_t scroll_report;
if (features.circular_scroll_enable) {
scroll_report = circular_scroll(touchData);
mouse_report->v = scroll_report.v;
mouse_report->h = scroll_report.h;
suppress_mouse_update = scroll_report.suppress_touch;
}
#endif
#if defined(CIRQUE_PINNACLE_TAP_ENABLE) && CIRQUE_PINNACLE_POSITION_MODE
if (features.tap_enable) {
*mouse_report = trackpad_tap(*mouse_report, touchData);
}
#endif
return suppress_mouse_update;
}
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