[SourceAura]

Fūin 封印 — a lockscreen (SDDM greeter theme) for the Jurai suite.

Jurai's Threshold — the lock face of the Jurai shell — seated on SDDM. Threshold was written against a small contract (the gate): the face never learns who checks the password. In the shell it already serves the session lock on PAM and the greetd greeter; this theme is its third host. content/Main.qml implements the gate against SDDM (sddm.login, userModel, sessionModel), and the face's own files stand as they are in the shell.

The face

• The wallpaper, blurred past reading behind a drawn veil — nothing behind it can be read
• The time in the bell's expressive face, with the dial (hour fill, minute orbit), and the date
• The portrait badge and the login name; a password field that grows from its middle, rimmed in slow prism light; a failure answers with a sentence under the field, in the alert colour
• The welcome: on a correct password the portrait and name stay, "Welcome to" and the Jurai logotype open out, hold, and fade to black before the session
• User and session choices at the foot of the screen, in the face's own typography — shown only when a real choice exists

Shape

• Drawn QML only — no video, no bundled photograph (the resting state is the sealed dark door; theme.conf's background seats any picture of the user's own). Light on the proving floor (a 2-core EliteBook): no media decoders, no image sequences
• Bundles the faces it speaks in — Spectral + Orbitron (SIL OFL, content/fonts/OFL.txt)
• Ships a qmldir: SDDM's greeter resolves sibling types from the folder but registers pragma Singleton files only when the folder stands as a module (noted in PROVENANCE — a face that loads and paints nothing is the symptom)
• One documented repair against upstream: Metrics.cellHeight, which Threshold's badge has always sized itself by and the shell never defined

Proof (on Ryoku, against this exact tree)

• sddm-greeter-qt6 --test-mode: resting face renders, password field focused, dial live
• Failure and welcome states framed and included in the source repo (SourceAura/fuin, docs/)
• tests/validate-catalogue.sh green; manifest verified by hash (lockscreens carry hand-built manifests)
• Full cycle on the local catalogue: install → greeter proof → remove → reinstall

Source: https://github.com/SourceAura/fuin (the shell: https://github.com/SourceAura/jurai-shell). Sibling submissions: #133 (Yatagarasu notifications), #134 (Yatagarasu Roost), #135 (Jurai Fastfetch).

One item per PR, per CONTRIBUTING.

[SourceAura]

Superseded by #141. Threshold was the port I filed first, but the lock screen I actually built — the one that wears my name — is the Kitsune. Closing this in its favor; the Fūin work stays in its repo (SourceAura/fuin) for the record. — 0xSrcAura