Andy Kopra
5f21d9099c
Direct-framebuffer ink pipeline (stock-quality strokes), finger-wipe erase, growable scrolling canvas with color-ghost cleanup, bidirectional toggle with a persistent 4-finger return launcher, instant button feedback. Includes prebuilt aarch64 binaries (dist/), build/deploy/install scripts, a user guide, and a complete technical reference. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
87 lines
3.0 KiB
C
87 lines
3.0 KiB
C
// Chatter launcher daemon. Runs always (systemd service), reads the touch device
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// (event3) WITHOUT grabbing it, and when it sees a multi-finger hold gesture
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// (>= FINGERS contacts held >= HOLD_MS) while xochitl is the active app, it
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// switches to Chatter. This is the "return to Chatter from the standard
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// interface" trigger (xochitl has no plugin API to add a real button).
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <unistd.h>
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#define DEV "/dev/input/event3"
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#define MAX_SLOTS 16
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#define FINGERS 4 // contacts required
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#define HOLD_MS 700 // how long they must be held
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#define COOLDOWN_MS 4000 // ignore re-triggers for this long
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static long now_ms(void)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return ts.tv_sec * 1000L + ts.tv_nsec / 1000000L;
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}
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int main(void)
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{
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long lastTrigger = 0;
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fprintf(stderr, "chatter-launcher: started (fingers=%d hold=%dms)\n", FINGERS, HOLD_MS);
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// Outer loop: (re)open the device forever, so a read interruption (e.g. the
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// device sleeping/waking) never kills the daemon.
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for (;;) {
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int fd = open(DEV, O_RDONLY);
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if (fd < 0) { sleep(2); continue; }
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int slot = 0;
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int tid[MAX_SLOTS];
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for (int i = 0; i < MAX_SLOTS; i++)
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tid[i] = -1;
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long holdStart = 0;
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int triggered = 0;
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struct input_event ev;
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while (read(fd, &ev, sizeof(ev)) == (ssize_t)sizeof(ev)) {
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if (ev.type == EV_ABS) {
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if (ev.code == ABS_MT_SLOT) {
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slot = ev.value;
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if (slot < 0) slot = 0;
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if (slot >= MAX_SLOTS) slot = MAX_SLOTS - 1;
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} else if (ev.code == ABS_MT_TRACKING_ID) {
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tid[slot] = ev.value; // >=0 active, -1 released
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}
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} else if (ev.type == EV_SYN && ev.code == SYN_REPORT) {
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int active = 0;
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for (int i = 0; i < MAX_SLOTS; i++)
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if (tid[i] >= 0) active++;
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const long t = now_ms();
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if (active >= FINGERS) {
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if (holdStart == 0)
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holdStart = t;
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else if (!triggered && (t - holdStart) >= HOLD_MS &&
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(t - lastTrigger) >= COOLDOWN_MS) {
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triggered = 1;
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lastTrigger = t;
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if (system("systemctl is-active --quiet xochitl") == 0) {
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fprintf(stderr, "chatter-launcher: gesture -> switching to Chatter\n");
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system("/home/root/chatter/to-chatter.sh >/dev/null 2>&1 &");
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}
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}
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} else {
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holdStart = 0;
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triggered = 0;
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}
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}
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}
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close(fd);
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fprintf(stderr, "chatter-launcher: input read ended, reopening\n");
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sleep(1);
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}
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return 0;
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}
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