New `PhotoSize::XLarge` variant sits between `Large` (2048px) and
`Full` (original). On-demand generated and disk-cached at
`_xlarge/<hash>.jpg`, same waterfall as `Large` (embedded RAW preview
→ ffmpeg → image crate). Sources below 4096px serve at native size.
Reduces decoded bitmap memory from ~192MB (48MP full) to ~64MB for
the mobile viewer's zoom tier.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds a third PhotoSize between Thumb (200px) and Full (original). The
viewer placeholder and map callout previously upscaled a 200px thumb
into a full-screen / full-width view, which looked visibly blocky on
3× devices. The new tier is generated on-demand, disk-cached, and
served via the existing /image endpoint.
Storage layout mirrors the Thumb branch's lookup chain:
1. hash-keyed: <thumbs>/_large/<hash[..2]>/<hash>.jpg (shared across
libraries when content_hash is known)
2. library-scoped legacy: <thumbs>/_large/<lib_id>/<rel_path>
Generation pipeline mirrors generate_image_thumbnail:
- RAW: decode the embedded JPEG preview, apply EXIF orientation,
resize to 2048-long-edge, encode JPEG q85
- HEIC/HEIF: ffmpeg with scale + q:v 5 (≈ q85)
- everything else: image crate decode + thumbnail() + JpegEncoder
Never upscales — sources below the 2048 cap re-encode at native size.
Handler offloads decode/resize to web::block to keep the actix worker
free (a 24MP source takes 100–500ms). Writes via tempfile+rename so
concurrent readers can't observe a half-written JPEG. On any
generation failure, falls through to the Full branch (which itself
serves the RAW embedded preview for unrenderable RAW containers).
Video requests for size=large fall back to the existing thumb pipeline
since there's no useful 2048px video tier.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
main.rs drops from 3542 → ~2930 lines by moving:
- src/backfill.rs (new): backfill_unhashed_backlog,
backfill_missing_date_taken, backfill_missing_content_hashes,
build_face_candidates, process_face_backlog. Now unit-tested for
the first time — 5 tests covering cap behavior, library-id
filtering, missing-on-disk skip, and the video/unhashed/scanned
filters on face-candidate selection.
- src/thumbnails.rs (new): unsupported_thumbnail_sentinel,
generate_image_thumbnail, create_thumbnails, update_media_counts,
is_image, is_video, plus the IMAGE_GAUGE / VIDEO_GAUGE Prometheus
metrics. Replaces the no-op stubs that used to live in lib.rs.
4 new unit tests for the sentinel path math and the
walker-counts-images-vs-videos smoke path.
Supporting:
- SqliteExifDao::from_shared (test-only) so an SqliteExifDao and
SqliteFaceDao can share one in-memory connection — required to
test build_face_candidates against the real join.
- files.rs / video/{mod,actors}.rs import from crate::thumbnails::*
instead of the now-removed stubs in lib.rs.
cargo test --bin image-api: 325 passing (was 314).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
