screentinker/server/player
ScreenTinker 604c390a55 Portrait on the web player was 420px off-screen — rotating a box does not move it
Reported as "rotation doesn't work correctly". It is a geometry bug, not a
rendering one, which is why it reads as mysterious.

#playerContainer is pinned `inset: 0`. Rotation set width:100vh, height:100vw and
rotate(90deg) — leaving the box in the TOP-LEFT corner and spinning it about its
own centre rather than the viewport's. On a 1920x1080 panel the content landed at
x -420..1500, y 420..1500 against a viewport of 0..1920, 0..1080: correctly
rotated, wrongly placed, cropped on two edges.

Tizen already did this correctly — top/left 50% plus translate(-50%,-50%) — and
Android does the equivalent with translationX/Y of (w-h)/2. The web player was
the odd one out, and BrightSign inherited it on top of its own hardware-plane
problem.

The rule now lives in server/lib/orientation-style.js, served to the player from
its single source, with the arithmetic pinned by tests that compute where the
rotated box actually lands on 16:9 and 5:4 panels. Three things those tests hold
that are easy to get wrong: the translate must come BEFORE the rotate (transforms
apply right-to-left, so reversing them rotates the correction too), 180 must NOT
swap dimensions (the box already fits; swapping letterboxes it), and landscape
must clear EVERY property the rotated state set (a half-reset leaves the
container stuck at 100vh wide, so rotation appears to persist after switching
back).

1074 pass.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uaeo9MvzKoyXuN6ZsbhtkL
2026-08-05 12:58:50 -05:00
..
debug-overlay.js Add player debug overlay and server-side error telemetry sink 2026-05-15 15:20:42 -05:00
index.html Portrait on the web player was 420px off-screen — rotating a box does not move it 2026-08-05 12:58:50 -05:00
sw.js A stale bridge must not kill the heartbeat, and rc3 must invalidate the shell 2026-08-05 12:18:44 -05:00