Display Sizing Recovery

Display Sizing Recovery

Current renderer policy

Renderer revision dynamic-fit-20261012-1 replaces the old fixed-band sizing model.

The TV renderer still uses one fixed 1920x1080 logical canvas. TV resolution and DPR only scale the finished canvas; they do not choose independent font sizes.

Title, subtitle, body, and timer are dynamic layout objects:

• empty objects consume no vertical space;
• title and subtitle stay on one line and shrink to fit;
• title, subtitle, and body use 18px logical horizontal gutters;
• the body receives otherwise-unused room;
• timer top/center/bottom changes object order instead of reserving a fixed timer band;
• every object may shrink as far as necessary to remain visible and non-overlapping.

The Display Studio and scheduled automation text editor now use the actual receiver renderer for WYSIWYG preview. Draft changes are shown locally before they are sent or saved.

After updating

Rebuild/recreate the RoomGoblin service and reload open receiver pages. In the receiver console run:

JSON.stringify(window.ClassroomDisplayDiagnostics(), null, 2)

Confirm revision is dynamic-fit-20261012-1, dynamic is true, active regions do not overlap, and title/body text remains fully contained.

See docs/DISPLAY-SIZING-RECOVERY.md and docs/DISPLAY-LAYOUT-CONTRACT.md in the repository for the engineering contract and verification details.