655 lines
22 KiB
Rust
655 lines
22 KiB
Rust
//! Floating placement and snapping in logical output coordinates.
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use std::collections::{BTreeMap, HashMap};
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use std::path::{Path, PathBuf};
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use ferese_layout::Rect;
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use serde::{Deserialize, Serialize};
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pub const SNAP_DISTANCE: f64 = 10.0;
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const RELEASE_DISTANCE: f64 = 20.0;
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pub const CASCADE_STEP: f64 = 32.0; // CSD titlebars have no protocol-supplied height.
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pub fn intersection(a: Rect, b: Rect) -> Option<Rect> {
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let x = a.x.max(b.x);
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let y = a.y.max(b.y);
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let width = (a.x + a.width).min(b.x + b.width) - x;
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let height = (a.y + a.height).min(b.y + b.height) - y;
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(width > 0.0 && height > 0.0).then_some(Rect::new(x, y, width, height))
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}
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pub fn clamp_to_work(mut rect: Rect, work: Rect) -> Rect {
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// Preserve client minimum sizes even when the work area is smaller.
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rect.x = rect
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.x
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.clamp(work.x, work.x + (work.width - rect.width).max(0.0));
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rect.y = rect
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.y
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.clamp(work.y, work.y + (work.height - rect.height).max(0.0));
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rect
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}
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pub fn centered(size: (f64, f64), anchor: Rect) -> Rect {
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Rect::new(
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anchor.x + (anchor.width - size.0) / 2.0,
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anchor.y + (anchor.height - size.1) / 2.0,
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size.0,
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size.1,
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)
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}
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pub fn anchored_size(rect: Rect, size: (f64, f64), left: bool, top: bool) -> Rect {
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Rect::new(
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if left {
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rect.x + rect.width - size.0
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} else {
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rect.x
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},
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if top {
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rect.y + rect.height - size.1
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} else {
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rect.y
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},
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size.0,
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size.1,
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)
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}
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pub fn min_overlap(
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size: (f64, f64),
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work: Rect,
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others: &[Rect],
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anchor: (f64, f64),
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) -> Option<Rect> {
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let (width, height) = size;
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if !width.is_finite()
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|| !height.is_finite()
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|| width > work.width
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|| height > work.height
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|| width <= 0.0
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|| height <= 0.0
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{
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return None;
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}
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let mut xs = vec![work.x, work.x + work.width - width];
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let mut ys = vec![work.y, work.y + work.height - height];
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// Add the user's anchor to avoid corner-only placement in open space.
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xs.push((anchor.0 - width / 2.0).clamp(work.x, work.x + work.width - width));
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ys.push((anchor.1 - height / 2.0).clamp(work.y, work.y + work.height - height));
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for other in others {
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xs.extend([other.x + other.width, other.x - width]);
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ys.extend([other.y + other.height, other.y - height]);
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}
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xs.retain(|x| *x >= work.x && *x + width <= work.x + work.width);
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ys.retain(|y| *y >= work.y && *y + height <= work.y + work.height);
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xs.sort_by(f64::total_cmp);
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ys.sort_by(f64::total_cmp);
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xs.dedup();
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ys.dedup();
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let mut best: Option<((f64, f64), Rect)> = None;
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for x in xs {
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for &y in &ys {
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let rect = Rect::new(x, y, width, height);
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let overlap = others
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.iter()
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.filter_map(|other| intersection(rect, *other))
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.map(|r| r.width * r.height)
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.sum::<f64>();
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let distance =
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(x + width / 2.0 - anchor.0).powi(2) + (y + height / 2.0 - anchor.1).powi(2);
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let cost = (overlap, distance);
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if best.as_ref().is_none_or(|(old, _)| {
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cost.0
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.total_cmp(&old.0)
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.then(cost.1.total_cmp(&old.1))
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.is_lt()
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}) {
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best = Some((cost, rect));
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}
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}
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}
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best.map(|(_, rect)| rect)
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}
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#[derive(Default)]
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pub struct Cascade {
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positions: HashMap<String, (f64, f64)>,
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}
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impl Cascade {
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pub fn place(&mut self, output: &str, work: Rect, size: (f64, f64)) -> Rect {
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let position = self
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.positions
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.entry(output.to_owned())
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.or_insert((work.x, work.y));
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if position.0 < work.x
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|| position.1 < work.y
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|| position.0 + size.0 > work.x + work.width
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|| position.1 + size.1 > work.y + work.height
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{
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*position = (work.x, work.y);
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}
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let rect = Rect::new(position.0, position.1, size.0, size.1);
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*position = (position.0 + CASCADE_STEP, position.1 + CASCADE_STEP);
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rect
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}
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}
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#[derive(Clone, Debug, Serialize, Deserialize)]
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pub struct Remembered {
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pub output: String,
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fractions: [f64; 4],
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}
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impl Remembered {
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pub fn new(output: String, rect: Rect, work: Rect) -> Self {
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Self {
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output,
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fractions: [
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(rect.x - work.x) / work.width,
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(rect.y - work.y) / work.height,
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rect.width / work.width,
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rect.height / work.height,
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],
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}
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}
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pub fn restore(&self, outputs: &[(String, Rect)]) -> Option<Rect> {
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let work = outputs.iter().find(|(name, _)| *name == self.output)?.1;
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if !self.fractions.iter().all(|v| v.is_finite())
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|| self.fractions[2] <= 0.0
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|| self.fractions[3] <= 0.0
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{
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return None;
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}
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let [x, y, w, h] = self.fractions;
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let rect = Rect::new(
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work.x + x * work.width,
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work.y + y * work.height,
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w * work.width,
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h * work.height,
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);
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if ![rect.x, rect.y, rect.width, rect.height]
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.iter()
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.all(|v| v.is_finite())
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{
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return None;
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}
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let visible = outputs.iter().any(|(_, area)| {
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intersection(rect, *area)
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.is_some_and(|r| r.width * r.height >= rect.width * rect.height * 0.25)
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});
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visible.then_some(rect)
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}
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}
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#[derive(Clone, Default)]
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pub struct Memory {
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entries: BTreeMap<String, Remembered>,
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}
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#[derive(Default)]
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struct SaveState {
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pending: Option<(PathBuf, Memory)>,
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closed: bool,
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}
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struct SaveThread {
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shared: std::sync::Arc<(std::sync::Mutex<SaveState>, std::sync::Condvar)>,
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thread: Option<std::thread::JoinHandle<()>>,
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}
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impl SaveThread {
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fn start(
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mut persist: impl FnMut(&Path, &Memory) -> std::io::Result<()> + Send + 'static,
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) -> std::io::Result<Self> {
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let shared = std::sync::Arc::new((
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std::sync::Mutex::new(SaveState::default()),
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std::sync::Condvar::new(),
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));
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let worker = shared.clone();
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let thread = std::thread::Builder::new()
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.name("floating-geometry-save".into())
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.spawn(move || {
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loop {
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let job = {
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let (mutex, ready) = &*worker;
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let mut state = mutex.lock().expect(
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"screenshot writer queue must remain consistent across workers",
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);
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while state.pending.is_none() && !state.closed {
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state = ready.wait(state).expect(
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"screenshot writer queue must remain consistent across workers",
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);
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}
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match state.pending.take() {
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Some(job) => job,
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None => break,
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}
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};
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// Serialization, directory creation, writes and fsync all run
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// outside the queue lock and outside the compositor thread.
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if let Err(error) = persist(&job.0, &job.1) {
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tracing::warn!(%error, "could not save floating window placement");
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}
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}
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})?;
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Ok(Self {
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shared,
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thread: Some(thread),
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})
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}
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fn queue(&self, path: PathBuf, memory: Memory) {
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let (mutex, ready) = &*self.shared;
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mutex
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.lock()
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.expect("screenshot writer queue must remain consistent across workers")
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.pending = Some((path, memory));
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ready.notify_one();
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}
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}
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impl Drop for SaveThread {
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fn drop(&mut self) {
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let (mutex, ready) = &*self.shared;
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mutex
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.lock()
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.expect("screenshot writer queue must remain consistent across workers")
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.closed = true;
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ready.notify_one();
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// Flush the latest snapshot only during compositor shutdown, after
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// the event loop has stopped. Drag completion never joins this thread.
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if let Some(thread) = self.thread.take() {
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let _ = thread.join();
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}
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}
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}
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#[derive(Default)]
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pub struct SaveWorker {
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worker: Option<SaveThread>,
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}
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impl SaveWorker {
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pub fn queue(&mut self, path: PathBuf, memory: &Memory) -> std::io::Result<()> {
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if self.worker.is_none() {
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self.worker = Some(SaveThread::start(|path, memory| memory.persist(path))?);
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}
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self.worker
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.as_ref()
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.expect("screenshot submission initialized the writer before queueing work")
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.queue(path, memory.clone());
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Ok(())
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}
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}
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impl Memory {
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pub fn get(&self, app_id: &str) -> Option<&Remembered> {
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self.entries.get(app_id)
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}
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pub fn save(&mut self, app_id: String, entry: Remembered) {
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if !app_id.is_empty() && app_id.len() <= 4096 {
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self.entries.insert(app_id, entry);
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}
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}
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pub fn load(path: &Path) -> Self {
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let entries = std::fs::metadata(path)
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.ok()
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.filter(|m| m.len() <= 1024 * 1024)
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.and_then(|_| std::fs::read(path).ok())
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.and_then(|bytes| serde_json::from_slice(&bytes).ok())
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.unwrap_or_default();
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Self { entries }
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}
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pub fn persist(&self, path: &Path) -> std::io::Result<()> {
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use std::io::Write;
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use std::os::unix::fs::OpenOptionsExt;
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let parent = path
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.parent()
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.ok_or_else(|| std::io::Error::other("memory path has no parent"))?;
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std::fs::create_dir_all(parent)?;
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let temporary = path.with_extension(format!("{}.tmp", std::process::id()));
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let result = (|| {
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let mut file = std::fs::OpenOptions::new()
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.write(true)
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.create_new(true)
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.mode(0o600)
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.open(&temporary)?;
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file.write_all(&serde_json::to_vec(&self.entries)?)?;
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file.sync_all()?;
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std::fs::rename(&temporary, path)
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})();
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if result.is_err() {
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let _ = std::fs::remove_file(temporary);
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}
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result
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}
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pub fn path() -> Option<PathBuf> {
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let root = std::env::var_os("XDG_STATE_HOME")
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.filter(|p| !p.is_empty())
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.map(PathBuf::from)
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.or_else(|| std::env::var_os("HOME").map(|p| PathBuf::from(p).join(".local/state")))?;
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Some(root.join("ferese/floating.json"))
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}
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}
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#[derive(Clone, Copy, Debug, PartialEq)]
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pub struct SnapLine {
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pub target: u64,
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pub position: f64,
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}
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#[derive(Default, Debug)]
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pub struct AxisSnap {
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stuck: Option<(SnapLine, bool)>,
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}
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impl AxisSnap {
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pub fn clear(&mut self) {
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self.stuck = None;
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}
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pub fn apply(&mut self, raw: f64, length: f64, lines: &[SnapLine]) -> f64 {
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if let Some((line, high)) = self.stuck {
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if let Some(current) = lines
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.iter()
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.find(|l| l.target == line.target && l.position == line.position)
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{
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let correction = current.position - raw - if high { length } else { 0.0 };
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if correction.abs() < RELEASE_DISTANCE {
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return raw + correction;
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}
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}
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self.stuck = None;
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}
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let nearest = lines
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.iter()
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.flat_map(|line| {
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[
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(line.position - raw, *line, false),
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(line.position - raw - length, *line, true),
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]
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})
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.min_by(|a, b| a.0.abs().total_cmp(&b.0.abs()));
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if let Some((correction, line, high)) = nearest
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&& correction.abs() < SNAP_DISTANCE
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{
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self.stuck = Some((line, high));
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raw + correction
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} else {
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raw
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}
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}
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}
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pub fn snap_lines(raw: Rect, work: Rect, others: &[(u64, Rect)]) -> (Vec<SnapLine>, Vec<SnapLine>) {
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let mut xs = vec![
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SnapLine {
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target: 0,
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position: work.x,
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},
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SnapLine {
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target: 0,
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position: work.x + work.width,
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},
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];
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let mut ys = vec![
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SnapLine {
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target: 0,
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position: work.y,
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},
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SnapLine {
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target: 0,
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position: work.y + work.height,
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},
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];
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for &(target, rect) in others {
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if raw.y - SNAP_DISTANCE <= rect.y + rect.height
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&& raw.y + raw.height + SNAP_DISTANCE >= rect.y
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{
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xs.extend([
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SnapLine {
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target,
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position: rect.x,
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},
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SnapLine {
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target,
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position: rect.x + rect.width,
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},
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]);
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}
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if raw.x - SNAP_DISTANCE <= rect.x + rect.width
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&& raw.x + raw.width + SNAP_DISTANCE >= rect.x
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{
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ys.extend([
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SnapLine {
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target,
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position: rect.y,
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},
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SnapLine {
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target,
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position: rect.y + rect.height,
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},
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]);
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}
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}
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(xs, ys)
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn saves_do_not_wait_for_storage_and_coalesce_to_the_latest_snapshot() {
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use std::sync::{Arc, Mutex, mpsc};
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let written = Arc::new(Mutex::new(Vec::new()));
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let recorded = written.clone();
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let (started_tx, started_rx) = mpsc::channel();
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let (release_tx, release_rx) = mpsc::channel();
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let mut first = true;
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let worker = SaveThread::start(move |_, memory| {
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recorded
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.lock()
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.unwrap()
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.push(memory.entries.keys().next().unwrap().clone());
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if first {
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first = false;
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started_tx.send(()).unwrap();
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release_rx.recv().unwrap(); // simulate arbitrarily slow storage
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}
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Ok(())
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})
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.unwrap();
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let snapshot = |name: &str| {
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let mut memory = Memory::default();
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memory.save(
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name.into(),
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Remembered::new(
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"panel".into(),
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Rect::new(0., 0., 10., 10.),
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Rect::new(0., 0., 100., 100.),
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),
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);
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memory
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};
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worker.queue(PathBuf::from("unused"), snapshot("first"));
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started_rx
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.recv_timeout(std::time::Duration::from_secs(2))
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.unwrap();
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worker.queue(PathBuf::from("unused"), snapshot("superseded"));
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worker.queue(PathBuf::from("unused"), snapshot("last"));
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assert_eq!(*written.lock().unwrap(), vec!["first"]);
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release_tx.send(()).unwrap();
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drop(worker); // shutdown drains the latest queued snapshot
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assert_eq!(*written.lock().unwrap(), vec!["first", "last"]);
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}
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#[test]
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fn transient_centers_on_visible_parent_and_clamps_without_shrinking() {
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let work = Rect::new(100., 50., 1000., 800.);
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let visible = intersection(Rect::new(-300., -100., 800., 600.), work).unwrap();
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assert_eq!(visible, Rect::new(100., 50., 400., 450.));
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assert_eq!(
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clamp_to_work(centered((200., 100.), visible), work),
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Rect::new(200., 225., 200., 100.)
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);
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assert!(intersection(Rect::new(-300., 50., 200., 100.), work).is_none());
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assert_eq!(
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clamp_to_work(Rect::new(-100., -100., 1200., 900.), work),
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Rect::new(100., 50., 1200., 900.)
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);
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}
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#[test]
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fn client_rounded_resize_keeps_the_opposite_edges_anchored() {
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let rect = Rect::new(100., 80., 800., 600.);
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assert_eq!(
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anchored_size(rect, (693., 547.), true, true),
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Rect::new(207., 133., 693., 547.)
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);
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assert_eq!(
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anchored_size(rect, (693., 600.), true, false),
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Rect::new(207., 80., 693., 600.)
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);
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assert_eq!(
|
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anchored_size(rect, (800., 547.), false, true),
|
|
Rect::new(100., 133., 800., 547.)
|
|
);
|
|
assert_eq!(
|
|
anchored_size(rect, (693., 547.), false, false),
|
|
Rect::new(100., 80., 693., 547.)
|
|
);
|
|
}
|
|
#[test]
|
|
fn placement_avoids_overlap_and_centers_empty_space() {
|
|
let work = Rect::new(10., 20., 100., 100.);
|
|
assert_eq!(
|
|
min_overlap((20., 20.), work, &[], (60., 70.)),
|
|
Some(Rect::new(50., 60., 20., 20.))
|
|
);
|
|
let obstacle = Rect::new(10., 20., 60., 100.);
|
|
let placed = min_overlap((20., 20.), work, &[obstacle], (60., 70.)).unwrap();
|
|
assert!(intersection(placed, obstacle).is_none());
|
|
// A tiny overlap must never win merely because it is nearer.
|
|
let placed = min_overlap(
|
|
(10., 10.),
|
|
Rect::new(0., 0., 1000., 10.),
|
|
&[Rect::new(0., 0., 10., 0.0001)],
|
|
(5., 5.),
|
|
)
|
|
.unwrap();
|
|
assert_eq!(placed.x, 10.);
|
|
}
|
|
#[test]
|
|
fn candidate_search_matches_exhaustive_positions() {
|
|
let mut seed = 719_u64;
|
|
let mut next = || {
|
|
seed = seed.wrapping_mul(6364136223846793005).wrapping_add(1);
|
|
(seed >> 32) as u32
|
|
};
|
|
for _ in 0..200 {
|
|
let size = ((next() % 8 + 1) as f64, (next() % 8 + 1) as f64);
|
|
let others = (0..5)
|
|
.map(|_| {
|
|
Rect::new(
|
|
(next() % 12) as f64,
|
|
(next() % 12) as f64,
|
|
(next() % 8 + 1) as f64,
|
|
(next() % 8 + 1) as f64,
|
|
)
|
|
})
|
|
.collect::<Vec<_>>();
|
|
let overlap = |r| {
|
|
others
|
|
.iter()
|
|
.filter_map(|o| intersection(r, *o))
|
|
.map(|r| r.width * r.height)
|
|
.sum::<f64>()
|
|
};
|
|
let placed = min_overlap(size, Rect::new(0., 0., 16., 16.), &others, (8., 8.)).unwrap();
|
|
let brute = (0..=16 - size.0 as i32)
|
|
.flat_map(|x| {
|
|
(0..=16 - size.1 as i32)
|
|
.map(move |y| Rect::new(x as f64, y as f64, size.0, size.1))
|
|
})
|
|
.map(overlap)
|
|
.min_by(f64::total_cmp)
|
|
.unwrap();
|
|
assert_eq!(overlap(placed), brute);
|
|
}
|
|
}
|
|
#[test]
|
|
fn memory_scales_and_rejects_missing_or_invisible_outputs() {
|
|
let entry = Remembered::new(
|
|
"panel".into(),
|
|
Rect::new(25., 50., 50., 25.),
|
|
Rect::new(0., 0., 100., 100.),
|
|
);
|
|
assert_eq!(
|
|
entry.restore(&[("panel".into(), Rect::new(100., 0., 200., 200.))]),
|
|
Some(Rect::new(150., 100., 100., 50.))
|
|
);
|
|
assert_eq!(entry.restore(&[]), None);
|
|
let offscreen = Remembered::new(
|
|
"panel".into(),
|
|
Rect::new(-90., 0., 100., 100.),
|
|
Rect::new(0., 0., 100., 100.),
|
|
);
|
|
assert_eq!(
|
|
offscreen.restore(&[("panel".into(), Rect::new(0., 0., 100., 100.))]),
|
|
None
|
|
);
|
|
let dir = tempfile::tempdir().unwrap();
|
|
let path = dir.path().join("floating.json");
|
|
let mut memory = Memory::default();
|
|
memory.save("app".into(), entry);
|
|
memory.persist(&path).unwrap();
|
|
assert!(Memory::load(&path).get("app").is_some());
|
|
}
|
|
#[test]
|
|
fn cascade_is_per_output_and_wraps() {
|
|
let mut cascade = Cascade::default();
|
|
let work = Rect::new(100., 50., 100., 100.);
|
|
assert_eq!(cascade.place("one", work, (50., 50.)).x, 100.);
|
|
assert_eq!(cascade.place("one", work, (50., 50.)).x, 132.);
|
|
assert_eq!(cascade.place("two", work, (50., 50.)).x, 100.);
|
|
assert_eq!(cascade.place("one", work, (50., 50.)).x, 100.);
|
|
assert!(min_overlap((150., 50.), work, &[], (100., 50.)).is_none());
|
|
}
|
|
#[test]
|
|
fn snap_hysteresis_keeps_the_same_edge_and_releases_from_raw_motion() {
|
|
let mut snap = AxisSnap::default();
|
|
let lines = [SnapLine {
|
|
target: 1,
|
|
position: 100.,
|
|
}];
|
|
assert_eq!(snap.apply(95., 50., &lines), 100.);
|
|
assert_eq!(snap.apply(85., 50., &lines), 100.);
|
|
assert_eq!(snap.apply(79., 50., &lines), 79.);
|
|
assert_eq!(snap.apply(45., 50., &lines), 50.);
|
|
assert_eq!(snap.apply(35., 50., &lines), 50.);
|
|
assert_eq!(snap.apply(35., 50., &[]), 35.);
|
|
snap.clear();
|
|
assert_eq!(snap.apply(85., 50., &lines), 85.);
|
|
assert_eq!(snap.apply(90., 50., &lines), 90., "10px does not acquire");
|
|
assert_eq!(snap.apply(91., 50., &lines), 100.);
|
|
assert_eq!(snap.apply(80., 50., &lines), 80., "20px releases");
|
|
assert_eq!(snap.apply(95., 50., &lines), 100.);
|
|
// A narrow window must not switch edges while stuck to the same line.
|
|
assert_eq!(snap.apply(86., 8., &lines), 100.);
|
|
let mut other_axis = AxisSnap::default();
|
|
assert_eq!(other_axis.apply(85., 50., &lines), 85.);
|
|
}
|
|
#[test]
|
|
fn snapping_excludes_windows_across_the_screen() {
|
|
let (xs, ys) = snap_lines(
|
|
Rect::new(0., 0., 50., 50.),
|
|
Rect::new(0., 0., 1000., 1000.),
|
|
&[
|
|
(1, Rect::new(100., 500., 50., 50.)),
|
|
(2, Rect::new(100., 20., 50., 50.)),
|
|
],
|
|
);
|
|
assert!(!xs.iter().any(|l| l.target == 1));
|
|
assert!(xs.iter().any(|l| l.target == 2));
|
|
assert!(!ys.iter().any(|l| l.target == 1 || l.target == 2));
|
|
}
|
|
}
|