nordisk/facett

facett-docview — crate card

Reverse-engineered (from source — verify, don't trust the name)

• One-line pitch: A pure-Rust documentation viewer that renders a Typst-authored manual (one vector SVG per page) inside egui — no pdfium / no native libs.
• Does: DocView shows a scrollable manual with a TOC sidebar and zoom. Each page (DocPage::from_svg_bytes) is parsed once via usvg at construction; visible pages rasterize on demand through resvg/tiny-skia into an egui texture. Uses a shared Arc fontdb (system fonts + embedded DejaVu Sans fallback) so real <text> SVGs (skade diagrams) render even airgapped. Texture cache keyed by (page, zoom bucket); rayon parses/rasterizes pages per-core. Zoom clamped MIN/MAX, tex dim clamped 4096.
• Key deps: facett-core (Facet), egui, resvg 0.47 (re-exports usvg/usvg::fontdb/tiny_skia — pins the whole SVG stack), rayon (data-parallel page work).
• Shape: lib, single module (~1200 lines). Key types: DocPage, PageSource trait, DocView.
• Observed role in the workspace: The offline manual viewer component (nordisk airgap ethos). Consumes SVGs a host exports from Typst; drops into a FacetDeck.

Fill in (one line each — only the human knows these)

• Primary consumer(s):
• Why it exists (vs the obvious alternative):
• Hard constraint (airgap / no-C-deps / no-FFI / pure-Rust / etc.):
• Release cadence & independence (rides a parent? own repo someday?):
• Status (production / prototype / experimental / stubbed):
• Must-NOT-change invariant:
• Biggest known gap or TODO:
• Anything a newcomer would get wrong about it: