Auto-populate a new box or line with a segmentation polygon, head/tail points or a tighter box

[mattdawkins]

Two new switches under New Annotation Settings (desktop only — they use the VIAME interactive segmentation service):

• Auto-populate mask — after a brand-new box or head/tail line is drawn, the loaded interactive segmentation model is prompted (a box: its centre; a line: foreground points at 10/30/50/70/90% along it) and the polygon is stored on the detection.
• Auto-populate points — for a box, head/tail are derived from that polygon by VIAME's polygon_keypoints (the same add_keypoints_from_mask hull-extremes code as the SAM2 head/tail utility pipeline). For a line, the box is tightened to the segmentation's bounds.

Either switch triggers the segmentation; only what is still missing on the detection is filled in (an existing polygon or line is left alone), so a user who keeps annotating is not overwritten. Hooked through a new onNewAnnotationGeometry callback in useModeManager that fires only for the first shape of a track being created.

• Stereo — with Auto compute location in other camera on, once the new box or line maps to the other camera successfully the mapped copy gets the same mask/points pass there (segmented on that camera's image). A derived head/tail is ordered to follow the source camera's line, and the stereo length is refreshed when length updates are on.

Needs VIAME/VIAME#299 for the polygon_keypoints command. Helper functions (prompt construction, ring closing, bounds) are unit tested; the end-to-end flow was verified against the running service but not yet clicked through in the app.

🤖 Generated with Claude Code