feat(codec): re-add TIFF image support - #271
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TIFF was dropped in #263 when the metadata modality landed (the old pixel-only handler predated the `#exif` sub-part design). Re-add it as a first-class image format, wired into the metadata modality so a TIFF's EXIF redacts alongside its pixels like JPEG's and PNG's. Threads TIFF through the same layers every image format uses: the `ImageFormat::Tiff` enum + mappings (elide-image), the macro-stamped `tiff_handler`, registry, and feature wiring (elide-codec), and the `codec-tiff` feature (elide facade). No new dependencies — `image`'s tiff feature and `little_exif`'s `FileExtension::TIFF` were already available. The one non-trivial part is the pixel-redaction + EXIF compose. Unlike JPEG (APP1 segment) and PNG (eXIf chunk), a TIFF's EXIF *is* the file's IFD, and `little_exif`'s TIFF `write_to_vec` rebuilds the whole file from the parsed metadata — it ignores externally re-encoded pixel bytes, silently dropping the redaction. `Source::transfer` now special-cases TIFF: it parses the freshly-encoded (redacted) container, whose metadata already carries the redacted pixels, and transplants the source's non-structural tags onto it (skipping the pixel-layout tags via `is_tiff_structural`). Result: one TIFF with redacted pixels plus the kept EXIF, sensitive fields dropped. Also split the image integration scenarios to `<format>_<scenario>`: `png.rs` → `png_round_trip.rs`, and add `png_exif.rs` + `tiff_exif.rs` so all three formats have parallel EXIF-strip coverage (PNG had none before). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018gJ48bgaCTTPB4MD9dcTJj
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Included review availability: 0 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 2 reviews per hour. 📝 WalkthroughWalkthroughThe change adds TIFF support across Cargo features, codec registration, image format handling, EXIF transfer, and facade-level tests. Tests cover TIFF metadata stripping, metadata transfer, pixel preservation, redaction, PNG EXIF handling, and image round trips. ChangesTIFF support
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~20 minutes Sequence Diagram(s)sequenceDiagram
participant Client
participant Orchestrator
participant TiffCodec
participant ExifHandler
Client->>Orchestrator: process TIFF image
Orchestrator->>TiffCodec: decode TIFF
TiffCodec-->>Orchestrator: image and metadata
Orchestrator->>ExifHandler: analyze and anonymize EXIF
ExifHandler-->>Orchestrator: redacted metadata
Orchestrator->>TiffCodec: encode TIFF
TiffCodec-->>Client: processed TIFF
Merge Risk: ⚪ Minimal · up to The TIFF metadata-transfer update is ready to merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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In `@crates/elide-image/src/exif/mod.rs`:
- Around line 268-282: Update transfer_tiff and is_tiff_structural so all TIFF
pixel-layout tags are excluded from source metadata transfer, including
PlanarConfiguration and tile offset/byte-count tags represented by little_exif
Unknown* variants. Prefer an explicit allowlist of transferable metadata or
classification by TIFF tag ID, and add a fixture covering a source layout that
differs from the encoder output.
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Cargo.tomlcrates/elide-codec/Cargo.tomlcrates/elide-codec/src/codec/registry.rscrates/elide-codec/src/handler/image/macros.rscrates/elide-codec/src/handler/image/mod.rscrates/elide-codec/src/handler/image/tiff_handler.rscrates/elide-codec/src/handler/mod.rscrates/elide-image/Cargo.tomlcrates/elide-image/src/buffer/format.rscrates/elide-image/src/buffer/mod.rscrates/elide-image/src/exif/mod.rscrates/elide-image/src/test_util.rscrates/elide/Cargo.tomlcrates/elide/src/recognition.rscrates/elide/tests/format_image/mod.rscrates/elide/tests/format_image/png_exif.rscrates/elide/tests/format_image/png_round_trip.rscrates/elide/tests/format_image/tiff_exif.rs
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Address the CodeRabbit review on #271. The TIFF transfer used a denylist (`is_tiff_structural`) that could never be exhaustive: tile tags (TileOffsets/TileByteCounts), PlanarConfiguration, and any tag `little_exif` parses as an `Unknown*` variant are pixel-layout tags a `matches!` denylist misses — so a tiled source TIFF would copy stale layout tags onto the strip-based re-encode and corrupt the output. Invert to an allowlist: transfer the EXIF/GPS/Interop sub-IFDs wholesale (pure metadata) plus a fixed set of benign IFD0 descriptive tags; every pixel-layout tag stays as the freshly-encoded container's own value. Iterates per-IFD via `get_ifds()`/`get_ifd_type()` so tags are classified by their IFD group. Strengthen the strip test to a leak-safety contract: a TIFF with GPS (sub-IFD) + Make (IFD0) + Orientation (IFD0), after redact + StripSensitive, has both sensitive fields gone, the pixels redacted, and the benign field retained. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018gJ48bgaCTTPB4MD9dcTJj
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Re-adds TIFF as a first-class image format, wired into the metadata modality so a TIFF's EXIF redacts alongside its pixels like JPEG's and PNG's. TIFF was dropped in #263 when the metadata modality landed (the old pixel-only handler predated the
#exifsub-part design); several docs still listed it, and now they're accurate again.What's here
ImageFormat::Tiff+ mappings (elide-image), macro-stampedtiff_handler+ registry + features (elide-codec),codec-tifffeature (elide facade). No new dependencies:image's tiff feature andlittle_exif'sFileExtension::TIFFwere already in the tree.little_exif's TIFFwrite_to_vecrebuilds the whole file from the parsed metadata, ignoring externally re-encoded pixels — so a pixel redaction was silently lost.Source::transfernow special-cases TIFF: parse the freshly-encoded (redacted) container (whose metadata already holds the redacted pixels), and transplant the source's non-structural tags onto it (skipping pixel-layout tags viais_tiff_structural). One TIFF, redacted pixels + kept EXIF, sensitive fields dropped. No upstreamlittle_exifchange needed.<format>_<scenario>:png.rs→png_round_trip.rs, and addedpng_exif.rs+tiff_exif.rsso all three formats have parallel EXIF-strip coverage (PNG had no EXIF test before).Investigation notes
little_exifbehavior is an undocumented design consequence (TIFF = IFD), not a fixable-by-config bug; the in-repo transplant is the clean workaround.Verification
format_image— TIFF/JPEG/PNG EXIF strip + PNG round-trip, 4 green.cargo clippy(image feature set) +cargo +nightly fmt+cargo +nightly docclean.🤖 Generated with Claude Code
https://claude.ai/code/session_018gJ48bgaCTTPB4MD9dcTJj
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