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Transitions have never run on BrightSign, and it was never a GPU problem.
`transitionRuntimeReady()` is a presence check on three globals and touches no
WebGL at all. A BrightSign roHtmlWidget is created with `nodejs_enabled: true`,
which puts Node's `module` into classic-script scope — so every shared module
that exported with an `else` took the CommonJS branch and never assigned its
browser global. The runtime was absent before WebGL was ever asked a question.
This is deducible from the fleet without touching the hardware: the player
pushes system.reboot / display.power / display.resolution / system.self_update
only behind BS.hasHost(), which needs require('@brightsign/messageport') to
resolve. Our XT245's stored capability row carries all four, so Node
integration was live in that page, so the CommonJS branch was taken.
Transitions are the least of it. schedule-eval.js had the same shape, and the
player falls back to "always active" when ScheduleEval is missing — so per-item
DAYPARTING silently stopped applying on that platform and scheduled content
played outside its window with nothing in any log. player-media-health.js the
same. Four files, all fixed by exporting to BOTH targets rather than either/or.
media-mute.js, orientation-style.js and wall-geometry.js already assigned their
globals in a separate unconditional block and were never affected; the audit
that reached me claimed all seven, and reading them is what separated the four
from the three.
THE GUARD, WITHOUT WHICH THE ABOVE IS A REGRESSION.
Restore the globals alone and BrightSign starts attempting video wipes it
cannot supply. On a hardware video plane drawImage(video) succeeds, throws
nothing, and paints a fully TRANSPARENT frame — so the wipe fades from nothing,
behind a video plane that is still lit. Worse than the hard cut it replaces.
The discriminator already existed: videoFrameIsCapturable() probes ALPHA, so a
genuine fade-to-black still reads as captured. It was wired into the screenshot
path and not this one, which asked isMediaReadable() — a CORS question, "am I
allowed to read this", not "did any pixels arrive". Both the outgoing frame and
the incoming warm-play snapshot now consult it, cached per platform, defaulting
to available while undetermined so a cold start is not crippled.
Net effect on BrightSign: image-to-image transitions light up, anything
involving video hard-cuts honestly, and dayparting starts working.
Full video transitions are reachable later — BrightSign documents that video
"captured as a canvas for WebGL processing must be routed to the GPU" via a
per-element hwz="off", which keeps hardware decode at an 8-bit/1080p ceiling.
That needs the hardware to validate and is not in this change.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014skWYXJUWhF73EvNPgB2AS
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| .. | ||
| agency-layouts.js | ||
| agency-targets.js | ||
| apk-cache.js | ||
| apk-signature.js | ||
| app-settings.js | ||
| billing-token.js | ||
| billing.js | ||
| bounded-snapshot-store.js | ||
| branding.js | ||
| brightsign-package.js | ||
| brightsign-update.js | ||
| chunked-prune.js | ||
| command-queue.js | ||
| content-ack-limiter.js | ||
| content-ingest.js | ||
| device-identity.js | ||
| device-sanitize.js | ||
| device-settings.js | ||
| device-timezone.js | ||
| emailVerify.js | ||
| flap-limiter.js | ||
| ghcr-check.js | ||
| image-gen.js | ||
| incident-classify.js | ||
| item-duration.js | ||
| limiter-telemetry.js | ||
| liveness.js | ||
| log-coalescer.js | ||
| login-lockout.js | ||
| media-mute.js | ||
| media-orientation.js | ||
| media-tools.js | ||
| numeric-code.js | ||
| orientation-style.js | ||
| ota-breaker.js | ||
| ota-download-guard.js | ||
| pair-lockout.js | ||
| parse-size.js | ||
| passwordReset.js | ||
| permissions.js | ||
| player-cache-policy.js | ||
| player-capabilities.js | ||
| player-media-health.js | ||
| reconnect-throttle.js | ||
| recovery-grant.js | ||
| rolling-counter.js | ||
| safe-socket.js | ||
| schedule-eval.js | ||
| schema-check.js | ||
| secretbox.js | ||
| session-settle.js | ||
| settings-pin.js | ||
| socket-rooms.js | ||
| ssrf-guard.js | ||
| status-log-writer.js | ||
| sync-backend.js | ||
| tcp-keepalive.js | ||
| tenancy.js | ||
| tenant-cascade-migration.js | ||
| thumbnail-backfill.js | ||
| totp-lockout.js | ||
| totp.js | ||
| transition-bundle.js | ||
| transition-config.js | ||
| upload-sniff.js | ||
| user-deletion.js | ||
| wall-geometry.js | ||
| wgt-cache.js | ||
| zone-validate.js | ||