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-rw-r--r--quantum/pointing_device_gestures.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/quantum/pointing_device_gestures.c b/quantum/pointing_device_gestures.c
new file mode 100644
index 0000000000..02b11ebe3f
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+++ b/quantum/pointing_device_gestures.c
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+/* 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 <string.h>
+#include "pointing_device_gestures.h"
+#include "timer.h"
+
+#ifdef POINTING_DEVICE_GESTURES_CURSOR_GLIDE_ENABLE
+# ifdef POINTING_DEVICE_MOTION_PIN
+# error POINTING_DEVICE_MOTION_PIN not supported when using inertial cursor. Need repeated calls to get_report() to generate glide events.
+# endif
+
+static void cursor_glide_stop(cursor_glide_context_t* glide) {
+ memset(&glide->status, 0, sizeof(glide->status));
+}
+
+static cursor_glide_t cursor_glide(cursor_glide_context_t* glide) {
+ cursor_glide_status_t* status = &glide->status;
+ cursor_glide_t report;
+ int32_t p;
+ int32_t x, y;
+
+ if (status->v0 == 0) {
+ report.dx = 0;
+ report.dy = 0;
+ report.valid = false;
+ cursor_glide_stop(glide);
+ goto exit;
+ }
+
+ status->counter++;
+ /* Calculate current 1D position */
+ p = status->v0 * status->counter - (int32_t)glide->config.coef * status->counter * status->counter / 2;
+ /*
+ * Translate to x & y axes
+ * Done this way instead of applying friction to each axis separately, so we don't end up with the shorter axis stuck at 0 towards the end of diagonal movements.
+ */
+ x = (int32_t)(p * status->dx0 / status->v0);
+ y = (int32_t)(p * status->dy0 / status->v0);
+ report.dx = (mouse_xy_report_t)(x - status->x);
+ report.dy = (mouse_xy_report_t)(y - status->y);
+ report.valid = true;
+ if (report.dx <= 1 && report.dx >= -1 && report.dy <= 1 && report.dy >= -1) {
+ /* Stop gliding once speed is low enough */
+ cursor_glide_stop(glide);
+ goto exit;
+ }
+ status->x = x;
+ status->y = y;
+ status->timer = timer_read();
+
+exit:
+ return report;
+}
+
+cursor_glide_t cursor_glide_check(cursor_glide_context_t* glide) {
+ cursor_glide_t invalid_report = {0, 0, false};
+ cursor_glide_status_t* status = &glide->status;
+
+ if (status->z || (status->dx0 == 0 && status->dy0 == 0) || timer_elapsed(status->timer) < glide->config.interval) {
+ return invalid_report;
+ } else {
+ return cursor_glide(glide);
+ }
+}
+
+static inline uint16_t sqrt32(uint32_t x) {
+ uint32_t l, m, h;
+
+ if (x == 0) {
+ return 0;
+ } else if (x > (UINT16_MAX >> 2)) {
+ /* Safe upper bound to avoid integer overflow with m * m */
+ h = UINT16_MAX;
+ } else {
+ /* Upper bound based on closest log2 */
+ h = (1 << (((__builtin_clzl(1) - __builtin_clzl(x) + 1) + 1) >> 1));
+ }
+ /* Lower bound based on closest log2 */
+ l = (1 << ((__builtin_clzl(1) - __builtin_clzl(x)) >> 1));
+
+ /* Binary search to find integer square root */
+ while (l != h - 1) {
+ m = (l + h) / 2;
+ if (m * m <= x) {
+ l = m;
+ } else {
+ h = m;
+ }
+ }
+ return l;
+}
+
+cursor_glide_t cursor_glide_start(cursor_glide_context_t* glide) {
+ cursor_glide_t invalid_report = {0, 0, false};
+ cursor_glide_status_t* status = &glide->status;
+
+ status->timer = timer_read();
+ status->counter = 0;
+ status->v0 = (status->dx0 == 0 && status->dy0 == 0) ? 0.0 : sqrt32(((int32_t)status->dx0 * 256 * status->dx0 * 256) + ((int32_t)status->dy0 * 256 * status->dy0 * 256)); // skip trigonometry if not needed, calculate distance in Q8
+ status->x = 0;
+ status->y = 0;
+ status->z = 0;
+
+ if (status->v0 < ((uint32_t)glide->config.trigger_px * 256)) { /* Q8 comparison */
+ /* Not enough velocity to be worth gliding, abort */
+ cursor_glide_stop(glide);
+ return invalid_report;
+ }
+
+ return cursor_glide(glide);
+}
+
+void cursor_glide_update(cursor_glide_context_t* glide, mouse_xy_report_t dx, mouse_xy_report_t dy, uint16_t z) {
+ cursor_glide_status_t* status = &glide->status;
+
+ status->dx0 = dx;
+ status->dy0 = dy;
+ status->z = z;
+}
+#endif