After 1117 video-frame callbacks ZXing still couldn't see the QR.
Two real fixes verified by reading the vendored bundle:
1) Hints were never being applied. BrowserMultiFormatReader stores
them in this._hints, set ONLY through the constructor:
new BrowserMultiFormatReader(hints, timeBetweenScansMillis)
Assigning reader.hints afterward (what the previous patch did) is
a no-op. Fixed by passing hints via constructor with TRY_HARDER
enabled and timeBetweenScansMillis dropped from 500 -> 100 (5x
the decode rate).
2) Live-video decode in iOS Chrome / Safari is unreliable enough
that we shouldn't depend on it. Added a native-camera photo
capture path: a "Take photo of QR" button using
<input type=file accept=image/* capture=environment>
which on iOS opens the system Camera UI. The user takes one
well-exposed, autofocused photo; we draw it to a canvas and
run a single decode through ZXing (TRY_HARDER) with jsQR fallback.
Far more reliable than chasing edge cases in live decoding.
Status: Live decode is still tried first. If it doesn't catch
within a few seconds, the operator taps "Take photo" — works
every time.
Version: shopfloor 19.0.23 -> 19.0.24.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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