dtourolleandClaude Opus 5
ca2a135e28
A version's uuid is the identity a cross-device merge keys on, and it was minted at random, per catalog, per image. Two devices indexing one Nextcloud library therefore held two different uuids for the same photograph — so the sidecar they shared collected a `default = 1` block each, `Version::merge` was never handed a matching pair to reconcile, and an afternoon's culling on the tablet did not exist as far as the laptop was concerned. `crate::merge` has said so in a comment since it was written: version uuids do not reconcile across devices, a uuid-keyed join unions nothing, so keywords are landed on the local default version instead. It named the problem and worked around it. `rating`'s own comment asserted the opposite — that generating the uuid here was what made it a cross-device identity — and `library::amend` repeated the claim. Uniqueness was never the difficulty; agreement was. `derived_version_uuid` computes it from `oc:fileid` instead. The server assigns that integer, every client pointed at the library sees the same one, and it survives a server-side rename and move — the three properties that already made `ASSIGN_BY_FILE_ID` prefer it to a content hash. The layout is a UUIDv8 (RFC 9562, an application-defined form) carrying all sixty-four bits verbatim across the variable fields with a fixed tag in the node field, so the mapping is injective by construction rather than by a hash's good behaviour, and a uuid in a sidecar can be read back to the file it belongs to by eye. A library with no server behind it has no shared identity to derive and keeps a generated one. The split is still reachable there if the folder is synced by something else; `Sidecar::fuse_default_versions` repairs that case rather than preventing it. Deriving it for new rows alone would have fixed nothing — every image in an existing library already has a version, so every one of them would have carried on writing to its own rival identity. `align_default_version_uuids` moves them, and runs from `schema::backfill` on every catalog open. It selects on the tag in SQL, so a catalog already realigned matches no rows and writes nothing, and it declines rather than fails where a virtual copy already holds the target. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
DarkRoom
A cross-platform, non-destructive RAW photo editor for Linux and Android.
Status: 0.9.0, and no longer a spike. A library opens, culls, develops and exports on both platforms, across eight tagged releases. What is not built is written down rather than merely absent — see docs/outstanding.md for the requirements that have no implementation and why, and docs/technical-debt.md for the compromises that were chosen.
Documentation
| Document | Contents |
|---|---|
| CONTRIBUTING.md | How to land a first change without reading the rest |
| requirements.md | What the software must do — 179 numbered requirements |
| architecture.md | How it is built — crates, GPU pipeline, data model, sync |
| technical-debt.md | Compromises taken deliberately, each with the condition that retires it |
| outstanding.md | What is not built, and whether that is a decision or a gap |
| code-health.md | What a contribution costs, per seam, measured |
| traceability.md | Generated: which requirement is claimed by which file |
| faces.md | Face detection and identity — the models, the licence problem, and what S14 measured |
Building
Desktop:
cargo run -p darkroom-desktop
Android (containerised toolchain, see docker/android):
./docker/android/build.sh cargo ndk -t arm64-v8a build --release
Git LFS is required for the model weights, and the toolchain pins itself. CONTRIBUTING.md has the details and the four commands CI will run against what you send.
Current state
Working. A catalog over a local folder, a Nextcloud account, or a folder a
sync client keeps in virtual-files mode — where a placeholder is treated as the
photograph rather than as a one-byte file. A virtualised library grid with a
capture-time timeline, ratings, labels, keywords, collections and a trash that
survives a crash mid-operation. Card ingest. Face detection and identity, with
the index syncing between devices. A develop pipeline of fifteen declared
operations fused into a single compute dispatch, plus the neighbourhood
operations that cannot be — clarity, texture, capture sharpening, noise
reduction, lens correction, spectral film simulation. Crop, straighten, spot
removal, gradient and subject-segmentation masks, named presets, and a
generated panel that no operation in ui/ is allowed to name. Export to JPEG,
PNG and 8- or 16-bit TIFF with resize and output sharpening.
The zero-copy display path works on desktop. The compute pass writes a texture that Slint composites directly, which is what ARCH §6.1 requires; the readback it forbids costs 96% of frame time at 4K, and
cargo run -p dr-gpu --example bench --features readback
still reproduces that measurement. The one exception is the Android develop view, which reads the frame back through the CPU because zero-copy there needs wgpu's Vulkan swapchain, and that tears a portrait window on a tablet whose panel is mounted landscape. It is debt, not a revision of the rule: the reasoning, the on-device measurements that forced it, and the three separate things any one of which would remove it are in technical-debt.md TD-1.
Not built. Plugins, compare and survey culling, focus peaking, burst grouping, AI denoise, tiled and progressive rendering, and most of the Android platform integration beyond running. The performance targets in §4.1 are unverified rather than unmet — the per-commit benchmark suite §8 requires does not exist, so nothing fails a build on a regression. docs/outstanding.md is the list, with the reasoning.
Licence
GPL-3.0-or-later.