wayland-mouse 0.5.3

Mac-like mouse acceleration for Wayland — pointer + scroll-wheel, tuned below the compositor via evdev/uinput.
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//! Small shared helpers.

use std::time::SystemTime;

/// Seconds between two kernel event timestamps; `+inf` if there is no previous
/// timestamp (first event), `0` if the clock ran backwards.
pub fn dt_secs(last: Option<SystemTime>, now: SystemTime) -> f64 {
    match last {
        Some(t) => now
            .duration_since(t)
            .map(|d| d.as_secs_f64())
            .unwrap_or(0.0),
        None => f64::INFINITY,
    }
}