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Dylan M. Taylor a4b57d47b9 Add craft-crs: Camera Raw crs: settings in XMP, read and written, from PhotoCraft (#996 )

* Add craft-crs: Camera Raw crs: settings in XMP, read and written, from PhotoCraft

The format half of PhotoCraft's Camera Raw settings files (crates/io/src/camera_raw_xmp.rs at
abeb16c96): the crs: settings of an XMP packet as written, Camera Raw's number and curve point
text, the crop and its orientation, a writer, and the toolkit marker. Which setting drives
which control stays in the app.

* craft-crs: structures carry their element and are written back

Local corrections and other structured settings were dropped, and an rdf:Seq of descriptions
read as empty strings. A structure now holds its crs: element, a sequence is only plain text
items, descriptions inside a structure are not read as top-level settings, and to_xmp writes
structures back.

* craft-crs: read packets through craft-metadata's XMP reader

One XMP reader for every crate: Settings::parse goes through craft_metadata::parse_xmp and
Settings::from_xmp takes its XmpData. Settings are kept by name (the reader's map has no file
order), structures are craft-metadata's XmpValue and are written back as rdf:parseType
Resource elements and rdf:Seq arrays. toolkit stays a bounded first-start-tag scan, as the
reader does not return x:xmptk.

2026-11-11 20:19:00 -05:00

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Adobe Camera Raw settings: the crs: namespace (http://ns.adobe.com/camera-raw-settings/1.0/) in an XMP packet, as Camera Raw's Save Settings writes an .xmp settings file and as Camera Raw, Lightroom and Bridge write a raw file's sidecar.

Settings::parse reads a file; Settings::from_xmp takes a packet already read by craft_metadata::parse_xmp. Settings come back by name (Exposure2012), the last one winning where a name repeats: text from an attribute or a plain element, the plain items of an rdf:Seq, or a structure (crs:GradientBasedCorrections and other local corrections) as craft_metadata's XmpValue, for the caller to read. The file's own prefixes do not matter. A description inside a structure belongs to the structure, not to the settings.
number, signed and points: Camera Raw's numbers (+0.50) and tone curve points ("32, 22").
Settings::crop: the crop rectangle, only when HasCrop is True; straightened, inverted, empty or unreadable crops are reported as unusable with the keys present. Crop::oriented and Crop::pixels place it on an upright frame of a given size.
Settings::to_xmp: a settings file Camera Raw's Load Settings reads, structures included, naming the toolkit that wrote it; toolkit reads that name back.

Which setting drives which control, and the ranges they clamp to, are the application's.

Limits

Limit	Value
Input	4 MiB (`MAX_XMP_BYTES`)
Nesting and size of the packet	`craft-metadata`'s XMP limits
Structure depth written	64 (`MAX_WRITE_DEPTH`)

XMP

Packets are read by craft-metadata's XMP reader, the one every crate shares. toolkit reads only the x:xmptk attribute of the first x:xmpmeta start tag, with a bounded craft-xml scan, because that reader does not return it.

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Limits

XMP

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