Mark a burst in the grid, and let it be folded away
The counterpart to the grouping: where the signatures come from, and how a group reaches a cell. Signatures are computed from the 256px thumbnails dr-thumbs already holds -- vastly more resolution than a 9x8 reduction can use -- so a library that has been browsed, or that has synced somebody else's shards, has already paid for them and no RAW is decoded for this. The consequence is stated rather than hidden: an image with no thumbnail gets no signature and never joins a burst. That is self-correcting, and it is why the pass runs when the thumbnail sweep finishes rather than on a timer. Nothing happens at import and nothing happens at query time. The mark is drawn as a child of the cell's TouchArea, for the same reason the star strip is: a click on it must not also reach `cell-clicked` and throw the user into develop, and children are hit-tested before the element they sit in. It is never hidden on hover the way the stars are -- a collapsed burst stands in for frames that are not on screen, and something has to say so whether or not a pointer is nearby. Folding changes what the grid's *query* returns rather than what its cells draw, because the grid is a window over an ordered query and the frames a fold hides are mostly not loaded. So the predicate joins VISIBLE in every query that lists or counts cells -- the window, the header's count, the run a shift-click resolves, and the ordinal a scrub lands on -- under the discipline VISIBLE's own comment sets out: present in four places of five is worse than absent, because the counts disagree with the cells and neither looks wrong on its own. There is a test for exactly that. `the_window_read_walks_the_ordering_index` now includes the burst clause. It asserts on the query plan while holding its own copy of the query, so left alone it would have gone on reporting green against a query the grid no longer runs. If the clause costs `images_grid_order` and puts the sort back, that fails here rather than becoming jitter someone measures in six months. The pass keeps its own drain timer in a thread-local instead of taking fields on the library controller, so everything the feature needs to run lives in one file and the screen that starts it holds nothing. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Claude Opus 5
@@ -0,0 +1,535 @@
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//! TRACES: FR-CULL-5
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//! Burst grouping, as the library screen uses it.
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//!
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//! [`dr_catalog::bursts`] holds the grouping itself and knows nothing about
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//! pixels. This is the other half: where the similarity signal comes from, and
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//! how a group reaches a grid cell.
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//!
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//! # The signal comes out of the thumbnail store
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//!
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//! A perceptual signature needs pixels, and the cheapest pixels in the app are
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//! the ones already sitting in `dr-thumbs`: a 256px JPEG per photograph, built
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//! for the grid, shared between devices, and vastly more resolution than a 9×8
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//! reduction can use. So this pass decodes thumbnails, never originals. A
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//! library that has been browsed — or that has synced somebody else's shards —
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//! has already paid for every signature it is about to get.
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//!
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//! The consequence, stated rather than hidden: **an image with no thumbnail
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//! gets no signature, and a frame with no signature never joins a burst.** That
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//! is self-correcting rather than permanent — the next pass finds the thumbnail
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//! the sweep has since built — and it is the reason this runs when the
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//! thumbnail sweep finishes rather than on a timer.
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//!
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//! # Why a pass and not a job
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//!
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//! Hashing is per-image and would make a perfectly good job kind. Grouping is
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//! not: a burst is a property of a *run* of frames, so a per-image job would
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//! regroup the library once per photograph. Since the two have to happen in that
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//! order and the second cannot be split, both live in one pass — the same
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//! argument docs/catalog.md §10.2 makes for face clustering.
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//!
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//! # It is never on the UI thread
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//!
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//! Decoding tens of thousands of thumbnails is bounded only by library size, and
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//! the one thing that must not grow with library size is how long the window
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//! stops answering (NFR-P9). Cancellation is dropping the receiver; a pass
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//! abandoned half way leaves the signatures it did compute — they are permanent
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//! and correct — and the previous grouping intact.
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use std::cell::{Cell, RefCell};
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use std::collections::HashMap;
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use std::path::PathBuf;
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use std::sync::mpsc::Receiver;
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use dr_catalog::bursts::{self, Rules, Signature};
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use dr_catalog::Catalog;
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use dr_thumbs::{ThumbSize, ThumbStore};
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use dr_types::ImageId;
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use slint::Model as _;
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use crate::AppWindow;
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/// How many signatures are written per transaction.
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///
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/// One transaction per image costs a WAL commit per thumbnail and turns a pass
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/// over a real library into minutes of fsync; one transaction for the whole pass
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/// holds a write lock for the duration and loses everything if the app closes.
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/// A few hundred is the usual answer to that trade.
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const WRITE_BATCH: usize = 256;
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/// Progress from a grouping pass.
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#[derive(Debug, Clone, PartialEq)]
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pub enum BurstMessage {
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/// How many images still need a signature. Sent once, before any decoding.
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Started { to_hash: usize },
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/// Cumulative signatures written.
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Progress { hashed: usize },
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/// The pass finished, and this is what the library now looks like.
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Finished {
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hashed: usize,
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bursts: usize,
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frames: usize,
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},
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/// It did not.
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Failed(String),
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}
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/// Hash whatever is missing a signature, then rebuild the grouping.
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///
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/// Both halves run on a worker thread. The catalog is opened here rather than
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/// shared with the UI's connection: SQLite connections are not `Send`, and WAL
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/// is what makes a second one safe while the grid reads (NFR-R1).
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pub fn spawn_grouping(catalog_path: PathBuf, thumbs_dir: PathBuf) -> Receiver<BurstMessage> {
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let (tx, rx) = std::sync::mpsc::channel();
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std::thread::spawn(move || {
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let catalog = match Catalog::open(&catalog_path) {
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Ok(c) => c,
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Err(e) => {
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let _ = tx.send(BurstMessage::Failed(format!("cannot open catalog: {e}")));
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return;
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}
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};
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let conn = catalog.connection();
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let outstanding = match bursts::images_without_signature(conn) {
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Ok(v) => v,
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Err(e) => {
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let _ = tx.send(BurstMessage::Failed(e.to_string()));
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return;
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}
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};
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if tx
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.send(BurstMessage::Started {
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to_hash: outstanding.len(),
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})
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.is_err()
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{
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return;
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}
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// A broken or absent store costs signatures, never correctness: the
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// grouping still runs over whatever is already hashed, and the images
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// that missed out are picked up by the next pass.
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let store = match ThumbStore::open(&thumbs_dir) {
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Ok(s) => Some(s),
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Err(e) => {
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log::warn!("thumbnail store unavailable, not hashing: {e}");
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None
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}
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};
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let hashed = match store {
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Some(store) => hash_all(conn, &store, &outstanding, &tx),
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None => 0,
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};
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match bursts::regroup(conn, Rules::default()) {
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Ok(report) => {
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log::info!(
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"bursts: {hashed} signature(s) added, {} group(s) over {} frame(s), \
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largest {}",
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report.bursts,
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report.frames,
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report.largest
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);
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let _ = tx.send(BurstMessage::Finished {
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hashed,
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bursts: report.bursts,
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frames: report.frames,
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});
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}
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Err(e) => {
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let _ = tx.send(BurstMessage::Failed(e.to_string()));
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}
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}
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});
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rx
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}
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thread_local! {
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/// The running pass's drain timer, and whether one is running.
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///
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/// Module-local rather than a pair of fields on the library controller, so
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/// that everything this feature needs to run lives in this file and the
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/// screen that starts it is left holding nothing. Safe as a thread local
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/// because Slint's event loop is single-threaded (NFR-P9) and this is only
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/// ever touched from it.
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///
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/// The flag is separate because stopping a timer does not drop it: a slot
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/// tested for emptiness would refuse every pass after the first.
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static DRAIN: RefCell<Option<slint::Timer>> = const { RefCell::new(None) };
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static RUNNING: Cell<bool> = const { Cell::new(false) };
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}
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/// Hash what has become hashable, then rebuild the library's burst grouping.
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///
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/// Fired when the thumbnail sweep finishes, because that is the moment the
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/// signatures can all be computed: the pass reads thumbnails, and until the
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/// sweep has run most images have none. Not on a timer, and not after every
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/// scan — a regroup is cheap but not free, and nothing is waiting on it.
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///
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/// `grouped` is called once, with the number of bursts the library now has, if
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/// the pass finishes. It is where the caller reloads the grid: the cells hold
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/// the same photographs they held before — a new burst arrives open — but every
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/// run of frames now carries a mark it did not have a moment ago, and only a
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/// reload carries it.
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///
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/// Deliberately silent otherwise. The sweeps around it report progress because
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/// they run for tens of minutes; this is seconds, and a status line for it would
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/// be a line the user must read in order to learn nothing.
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pub fn start_pass(
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catalog_path: PathBuf,
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thumbs_dir: PathBuf,
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grouped: impl Fn(usize) + 'static,
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) {
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// A second pass would read the same rows and write the same answer over the
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// first one's transactions.
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if RUNNING.get() {
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return;
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}
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RUNNING.set(true);
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let rx = spawn_grouping(catalog_path, thumbs_dir);
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let timer = slint::Timer::default();
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timer.start(
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slint::TimerMode::Repeated,
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std::time::Duration::from_millis(400),
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move || loop {
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let msg = match rx.try_recv() {
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Ok(m) => m,
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Err(std::sync::mpsc::TryRecvError::Empty) => return,
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Err(std::sync::mpsc::TryRecvError::Disconnected) => {
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finish();
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return;
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}
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};
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match msg {
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BurstMessage::Started { to_hash } => {
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log::info!("burst grouping: {to_hash} image(s) still to hash");
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}
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// Nothing on screen is showing this. Drained rather than
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// ignored, because an unread channel is a worker that stalls.
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BurstMessage::Progress { hashed } => {
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log::debug!("burst grouping: {hashed} hashed so far");
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}
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BurstMessage::Finished {
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hashed,
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bursts,
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frames,
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} => {
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log::info!(
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"burst grouping: {hashed} signature(s) added, \
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{bursts} group(s) over {frames} frame(s)"
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||||
);
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finish();
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grouped(bursts);
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return;
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}
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BurstMessage::Failed(e) => {
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log::warn!("burst grouping: {e}");
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finish();
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return;
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}
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}
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},
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);
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DRAIN.with(|slot| *slot.borrow_mut() = Some(timer));
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}
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/// Stop draining, and let another pass start.
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///
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/// Stops the timer without dropping it — dropping one from inside its own
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/// callback is not something to rely on — which is why the flag beside it is
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/// what actually says whether a pass is running.
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fn finish() {
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RUNNING.set(false);
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DRAIN.with(|slot| {
|
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if let Some(timer) = slot.borrow().as_ref() {
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timer.stop();
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}
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});
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}
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/// Decode each image's stored thumbnail and record its signature.
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///
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/// Returns how many were written. Anything without a stored thumbnail, or whose
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/// blob will not decode, is simply skipped — it keeps its NULL and comes back
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/// next time, which is the same treatment `spawn_thumbnails` gives a corrupt
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/// blob.
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fn hash_all(
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conn: &rusqlite::Connection,
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store: &ThumbStore,
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outstanding: &[ImageId],
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tx: &std::sync::mpsc::Sender<BurstMessage>,
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) -> usize {
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let keys = thumbnail_keys(conn);
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let mut pending: Vec<(ImageId, Signature)> = Vec::with_capacity(WRITE_BATCH);
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let mut written = 0usize;
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for image in outstanding {
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let Some(file_id) = keys.get(image).copied() else {
|
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continue;
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||||
};
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||||
// The grid class, not the large one: 256px is already thirty times the
|
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// detail the reduction keeps, and asking for `Large` would miss most of
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// the store, which is filled at `Grid`.
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let Ok(Some(thumb)) = store.get(file_id, ThumbSize::Grid) else {
|
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continue;
|
||||
};
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let Ok((w, h, rgba)) = dr_thumbs::decode_rgba(&thumb.bytes) else {
|
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continue;
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||||
};
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let Some(signature) = bursts::signature_of_rgba(&rgba, w, h) else {
|
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continue;
|
||||
};
|
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pending.push((*image, signature));
|
||||
|
||||
if pending.len() >= WRITE_BATCH {
|
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written += flush(conn, &mut pending);
|
||||
if tx.send(BurstMessage::Progress { hashed: written }).is_err() {
|
||||
// The receiver is gone: the screen has moved on, and finishing
|
||||
// the pass would be work nobody is waiting for.
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return written;
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||||
}
|
||||
}
|
||||
}
|
||||
written += flush(conn, &mut pending);
|
||||
written
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||||
}
|
||||
|
||||
/// Write one batch of signatures, emptying `pending`.
|
||||
fn flush(conn: &rusqlite::Connection, pending: &mut Vec<(ImageId, Signature)>) -> usize {
|
||||
if pending.is_empty() {
|
||||
return 0;
|
||||
}
|
||||
let n = pending.len();
|
||||
let tx = match conn.unchecked_transaction() {
|
||||
Ok(t) => t,
|
||||
Err(e) => {
|
||||
log::warn!("recording signatures: {e}");
|
||||
pending.clear();
|
||||
return 0;
|
||||
}
|
||||
};
|
||||
for (image, signature) in pending.drain(..) {
|
||||
if let Err(e) = bursts::set_signature(&tx, image, signature) {
|
||||
log::debug!("recording signature for {}: {e}", image.0);
|
||||
}
|
||||
}
|
||||
match tx.commit() {
|
||||
Ok(()) => n,
|
||||
Err(e) => {
|
||||
log::warn!("committing signatures: {e}");
|
||||
0
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Every image's thumbnail-store key, in one query.
|
||||
///
|
||||
/// Read whole rather than asked per image: the table is one small row per
|
||||
/// photograph, and a query per image would be tens of thousands of statements
|
||||
/// to save a megabyte.
|
||||
fn thumbnail_keys(conn: &rusqlite::Connection) -> HashMap<ImageId, u64> {
|
||||
let mut out = HashMap::new();
|
||||
let Ok(mut stmt) = conn.prepare("SELECT image_id, file_id FROM remote") else {
|
||||
return out;
|
||||
};
|
||||
let Ok(rows) = stmt.query_map([], |r| Ok((r.get::<_, i64>(0)?, r.get::<_, i64>(1)?))) else {
|
||||
return out;
|
||||
};
|
||||
for (image, file) in rows.flatten() {
|
||||
out.insert(ImageId(image as u64), file as u64);
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
/// Fill in the burst badge on every cell of the loaded window.
|
||||
///
|
||||
/// One query for the window, in the same style as the collection badges and the
|
||||
/// rating counts beside it — a grid that asks the catalog a question per cell is
|
||||
/// a grid that stutters under a finger.
|
||||
///
|
||||
/// `ids` is the window in grid order, so the row index into the model is the
|
||||
/// index into it.
|
||||
pub fn sync_badges(window: &AppWindow, catalog: &Catalog, ids: &[ImageId]) {
|
||||
if ids.is_empty() {
|
||||
return;
|
||||
}
|
||||
let found = match bursts::memberships(catalog.connection(), ids) {
|
||||
Ok(m) => m,
|
||||
Err(e) => {
|
||||
log::debug!("reading burst membership: {e}");
|
||||
return;
|
||||
}
|
||||
};
|
||||
|
||||
let model = window.get_library_cells();
|
||||
for (row, id) in ids.iter().enumerate() {
|
||||
let (count, expanded) = match found.get(id) {
|
||||
Some(m) => (m.size as i32, m.expanded),
|
||||
// Not in a burst at all, which is most of a library.
|
||||
None => (0, false),
|
||||
};
|
||||
if let Some(mut cell) = model.row_data(row) {
|
||||
if cell.burst_count != count || cell.burst_expanded != expanded {
|
||||
cell.burst_count = count;
|
||||
cell.burst_expanded = expanded;
|
||||
model.set_row_data(row, cell);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Open or close the burst one cell belongs to.
|
||||
///
|
||||
/// Which direction is decided from what the catalog says the group is currently
|
||||
/// doing, rather than from the cell's own `burst-expanded`. The cell is a copy
|
||||
/// of that state and can be one reload behind; the table cannot.
|
||||
///
|
||||
/// The caller reloads the grid rather than repainting it, because collapsing
|
||||
/// changes what the grid's *query* returns: the row count, the scrollbar and
|
||||
/// the ordinal a scrub resolves all move together, and they can only stay in
|
||||
/// step by being read again together.
|
||||
///
|
||||
/// Returns whether anything changed, so a click on a cell that is in no burst —
|
||||
/// an entirely normal thing to happen — costs no round trip through the grid.
|
||||
pub fn toggle(catalog: &Catalog, image: ImageId) -> bool {
|
||||
let conn = catalog.connection();
|
||||
let Ok(found) = bursts::memberships(conn, &[image]) else {
|
||||
return false;
|
||||
};
|
||||
let Some(membership) = found.get(&image) else {
|
||||
return false;
|
||||
};
|
||||
match bursts::set_expanded(conn, membership.burst_id, !membership.expanded) {
|
||||
Ok(()) => true,
|
||||
Err(e) => {
|
||||
log::warn!("toggling burst {}: {e}", membership.burst_id.0);
|
||||
false
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
/// A catalog with two frames of one burst, and a thumbnail store holding a
|
||||
/// picture for each.
|
||||
///
|
||||
/// `name` keeps two tests from sharing a directory, since they run in
|
||||
/// parallel. Same shape as the store tests in `library`, which is also why
|
||||
/// this reaches for `temp_dir` rather than a crate: nothing else here needs
|
||||
/// one.
|
||||
fn library(name: &str) -> (Catalog, PathBuf) {
|
||||
let cat = Catalog::in_memory().unwrap();
|
||||
let c = cat.connection();
|
||||
c.execute(
|
||||
"INSERT INTO roots(id, kind, label) VALUES (1, 'local', 'lib')",
|
||||
[],
|
||||
)
|
||||
.unwrap();
|
||||
for (id, at) in [(1i64, 1000i64), (2, 1001)] {
|
||||
c.execute(
|
||||
"INSERT INTO images(id, root_id, source_ref, captured_at, camera, added_at)
|
||||
VALUES (?1, 1, ?2, ?3, 'Canon EOS R5', 0)",
|
||||
rusqlite::params![id, format!("IMG_{id}.CR3"), at],
|
||||
)
|
||||
.unwrap();
|
||||
c.execute(
|
||||
"INSERT INTO remote(image_id, file_id) VALUES (?1, ?2)",
|
||||
rusqlite::params![id, 100 + id],
|
||||
)
|
||||
.unwrap();
|
||||
}
|
||||
|
||||
let dir = std::env::temp_dir().join(format!("dr-ui-bursts-{name}-{}", std::process::id()));
|
||||
let _ = std::fs::remove_dir_all(&dir);
|
||||
{
|
||||
let mut store = ThumbStore::open(&dir).unwrap();
|
||||
for (id, shift) in [(1u64, 0usize), (2, 1)] {
|
||||
let rgba = picture(shift);
|
||||
let bytes = dr_thumbs::encode_rgba(64, 64, &rgba).unwrap();
|
||||
store
|
||||
.put(
|
||||
100 + id,
|
||||
ThumbSize::Grid,
|
||||
&dr_thumbs::Thumbnail {
|
||||
width: 64,
|
||||
height: 64,
|
||||
bytes,
|
||||
},
|
||||
)
|
||||
.unwrap();
|
||||
}
|
||||
}
|
||||
(cat, dir)
|
||||
}
|
||||
|
||||
/// A blocky scene, moved sideways by `shift` pixels — one frame of a burst
|
||||
/// and then the next.
|
||||
fn picture(shift: usize) -> Vec<u8> {
|
||||
let mut out = vec![0u8; 64 * 64 * 4];
|
||||
for y in 0..64 {
|
||||
for x in 0..64 {
|
||||
let v = (((x + shift) / 8) * 37 + (y / 8) * 91) as u8;
|
||||
let p = (y * 64 + x) * 4;
|
||||
out[p] = v;
|
||||
out[p + 1] = v;
|
||||
out[p + 2] = v;
|
||||
out[p + 3] = 255;
|
||||
}
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn the_pass_hashes_from_thumbnails_and_groups_what_it_hashed() {
|
||||
let (cat, dir) = library("hashes");
|
||||
let conn = cat.connection();
|
||||
let store = ThumbStore::open(&dir).unwrap();
|
||||
let outstanding = bursts::images_without_signature(conn).unwrap();
|
||||
assert_eq!(outstanding.len(), 2);
|
||||
|
||||
let (tx, _rx) = std::sync::mpsc::channel();
|
||||
let hashed = hash_all(conn, &store, &outstanding, &tx);
|
||||
assert_eq!(hashed, 2, "both thumbnails should have yielded a signature");
|
||||
|
||||
let report = bursts::regroup(conn, Rules::default()).unwrap();
|
||||
assert_eq!(report.bursts, 1, "the two frames were not grouped");
|
||||
assert_eq!(report.frames, 2);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn an_image_with_no_thumbnail_keeps_its_null() {
|
||||
let (cat, dir) = library("no-thumb");
|
||||
let conn = cat.connection();
|
||||
conn.execute(
|
||||
"INSERT INTO images(id, root_id, source_ref, captured_at, added_at)
|
||||
VALUES (9, 1, 'IMG_9.CR3', 1002, 0)",
|
||||
[],
|
||||
)
|
||||
.unwrap();
|
||||
|
||||
let store = ThumbStore::open(&dir).unwrap();
|
||||
let outstanding = bursts::images_without_signature(conn).unwrap();
|
||||
let (tx, _rx) = std::sync::mpsc::channel();
|
||||
assert_eq!(hash_all(conn, &store, &outstanding, &tx), 2);
|
||||
// And it is still offered next time, rather than being written off.
|
||||
assert_eq!(
|
||||
bursts::images_without_signature(conn).unwrap(),
|
||||
vec![ImageId(9)]
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn toggling_a_cell_that_is_in_no_burst_changes_nothing() {
|
||||
let (cat, _dir) = library("no-burst");
|
||||
assert!(!toggle(&cat, ImageId(1)));
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user