Sylpheed/crates/sylpheed-formats/examples/settle_window.rs

// The settled screen, computed from the keyframe times alone.
//
// `rest()` picks each element's last HOLD keyframe independently, which is right
// for an element that ends settled and wrong for a transient: a 2-frame flash
// holds at its PEAK, so `rest()` leaves it burning forever. The settled screen is
// instead one INSTANT that every element is posed at, and the instant to pick is
// inside the longest interval during which no element has a keyframe at all.
use sylpheed_formats::{pak, ui_layout};
fn main() {
    let mut a = std::env::args().skip(1);
    let pk = a.next().unwrap();
    let ar = pak::PakArchive::open(&pk).unwrap();
    let only: Option<usize> = a.next().and_then(|s| s.parse().ok());
    for (i, e) in ar.entries().iter().enumerate() {
        if let Some(o) = only {
            if o != i {
                continue;
            }
        }
        let Ok(by) = ar.read(e) else { continue };
        let Some(b) = ui_layout::parse_build(&by) else {
            continue;
        };
        if b.elements.len() < 2 {
            continue;
        }
        let mut ts: Vec<u32> = b
            .elements
            .iter()
            .flat_map(|el| el.keyframes.iter().filter_map(|k| k.time))
            .collect();
        if ts.len() < 2 {
            continue;
        }
        ts.sort_unstable();
        ts.dedup();
        // longest gap between consecutive keyframe times
        let (mut best, mut lo, mut hi) = (0u32, 0u32, 0u32);
        for w in ts.windows(2) {
            if w[1] - w[0] > best {
                best = w[1] - w[0];
                lo = w[0];
                hi = w[1];
            }
        }
        println!("{:>4}  {:<28} times {:>3}  span {:>4}  settle window [{lo},{hi}] = {best} units ({:.2}s)  -> t={}",
                 i, format!("{:08x}",e.name_hash), ts.len(), ts.last().unwrap(), best as f64/60.0, lo+best/2);
    }
}