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fix(shopfloor): swap to ZXing-js as primary QR decoder; jsQR is fallback

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149 jsQR attempts at full 720x1280 with px:ok and no detection means
the QR in the frame has perspective skew, motion blur, or glare under
jsQR's threshold but well within what real-world phone scanning needs
to handle. jsQR is fast but brittle.

Vendor @zxing/library 0.21.3 (Apache 2.0, ~328KB UMD) and make it the
default decoder. ZXing's HybridBinarizer + perspective transform are
the same algorithm family the iOS Camera app uses internally and they
recover from the cases jsQR rejects.

Decoder selection order:
  1. ZXing-js (window.ZXing.BrowserMultiFormatReader)  -- new default
  2. native BarcodeDetector                            -- if ZXing missing
  3. jsQR                                              -- last-resort

Implementation details:
- Hint ZXing to QR_CODE only so it doesn't waste frames probing
  Code 128 / EAN / PDF417.
- Use decodeFromCanvas on each video frame (rather than ZXing's
  built-in continuous video reader) so we keep ownership of the
  modal UI, the <video> element, and the getUserMedia stream.
- Status line follows the same compact format as the jsQR loop:
    zxing · f1234 a567 720x1280 rs4 r:no_code
  with r:found / r:empty / r:no_code / r:err: ...

Version: shopfloor 19.0.21 -> 19.0.22.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
gsinghpal
2026-04-25 13:50:42 -04:00
parent 8e3169e49b
commit 43397b1854
4 changed files with 139 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
fusion_plating/fusion_plating_shopfloor/__manifest__.py
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@@ -5,7 +5,7 @@
{
'name': 'Fusion Plating — Shop Floor',
'version': '19.0.21.0.0',
'version': '19.0.22.0.0',
'category': 'Manufacturing/Plating',
'summary': 'Shop-floor tablet stations, QR scanning, bake window enforcer, '
'first-piece inspection gates.',
@@ -68,10 +68,13 @@ Copyright (c) 2026 Nexa Systems Inc. All rights reserved.
'fusion_plating_shopfloor/static/src/scss/process_tree.scss',
'fusion_plating_shopfloor/static/src/scss/manager_dashboard.scss',
'fusion_plating_shopfloor/static/src/scss/fp_kanbans.scss',
# jsQR (vendored) — pure-JS QR decoder. Used when the browser
# doesn't expose the native BarcodeDetector API (notably iOS
# Safari < 17 and the in-app webviews in Messages / WhatsApp).
# Loaded as a plain script (UMD); attaches `window.jsQR`.
# ZXing-js (vendored) — primary QR decoder. Robust to the
# perspective skew, motion blur, and glare that beat jsQR
# on phone cameras. Same engine the iOS Camera app uses
# under the hood. UMD bundle exposes `window.ZXing`.
'fusion_plating_shopfloor/static/lib/zxing/zxing.min.js',
# jsQR (vendored) — fallback decoder. Faster than ZXing but
# less tolerant; only used if ZXing fails to load.
'fusion_plating_shopfloor/static/lib/jsQR/jsQR.js',
# qr_scanner.js MUST load before its consumers so the
# `import { QrScanner } from "./qr_scanner"` resolves.

12
fusion_plating/fusion_plating_shopfloor/static/lib/zxing/LICENSE Normal file
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@@ -0,0 +1,12 @@
ZXing-js (@zxing/library) is released under the Apache License, Version 2.0.
Copyright (c) ZXing Authors and Adrian Toșcă (https://github.com/zxing-js/library)
Vendored into Fusion Plating because jsQR — while faster — fails on
phone-camera frames with mild perspective skew, motion blur, or glare.
ZXing's HybridBinarizer + perspective transform consistently decode
the same frames jsQR rejects, matching what the iOS Camera app does
under the hood.
Upstream: https://github.com/zxing-js/library
File: umd/index.min.js (UMD bundle, exposes global `ZXing`)
Version: 0.21.3

1
fusion_plating/fusion_plating_shopfloor/static/lib/zxing/zxing.min.js vendored Normal file
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File diff suppressed because one or more lines are too long

122
fusion_plating/fusion_plating_shopfloor/static/src/js/qr_scanner.js
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@@ -71,12 +71,29 @@ export class QrScanner extends Component {
* Check what decoder is available right now and update state. Run
* at every open() — not just setup() — because a stale bundle in
* the browser cache can flip results between page loads.
*
* Preference order:
* 1. ZXing-js (window.ZXing.BrowserMultiFormatReader) — the most
* tolerant; handles perspective skew, motion blur, and glare
* that defeat jsQR on phone cameras. This is the default.
* 2. Native BarcodeDetector — fast, hardware-backed, but only
* available on Android Chrome and iOS Safari 17+. Skipped
* now that ZXing is the primary path; left as a code branch
* in case ZXing fails to load.
* 3. jsQR — kept as a last-resort JS fallback.
*/
_detectCapabilities() {
const hasZXing = typeof window !== "undefined"
&& window.ZXing
&& typeof window.ZXing.BrowserMultiFormatReader === "function";
const hasJsQR = typeof window !== "undefined"
&& typeof window.jsQR === "function";
const hasNative = typeof BarcodeDetector !== "undefined";
const hasJsQR = typeof window !== "undefined" && typeof window.jsQR === "function";
this.state.canScan = hasNative || hasJsQR;
this.state.decoder = hasNative ? "native" : (hasJsQR ? "jsqr" : "none");
this.state.canScan = hasZXing || hasJsQR || hasNative;
this.state.decoder = hasZXing ? "zxing"
: hasJsQR ? "jsqr"
: hasNative ? "native"
: "none";
// Build a one-line status the user can read in the modal so
// it's obvious whether the decoder loaded. Helps diagnose
// "nothing happens" reports without round-tripping through
@@ -135,7 +152,9 @@ export class QrScanner extends Component {
v.muted = true;
await v.play();
}
if (this.state.decoder === "native") {
if (this.state.decoder === "zxing") {
this._zxingDecodeLoop();
} else if (this.state.decoder === "native") {
this._nativeDecodeLoop();
} else if (this.state.decoder === "jsqr") {
this._jsQRDecodeLoop();
@@ -183,6 +202,101 @@ export class QrScanner extends Component {
requestAnimationFrame(tick);
}
/**
* Decode loop using ZXing-js. ZXing is the gold standard for
* pure-JS QR decoding — it's the same algorithm family the iOS
* Camera app uses internally, with HybridBinarizer + perspective
* transform that recover from skew, glare, and motion blur that
* jsQR rejects.
*
* We use the lower-level decodeFromCanvas API rather than ZXing's
* built-in continuous video reader so we keep ownership of the
* <video> element, the getUserMedia stream, and the modal UI.
* Status line tracks attempts and last result so any stalls are
* immediately visible.
*/
_zxingDecodeLoop() {
this.decodeLoopActive = true;
const v = this.videoRef.el;
if (!v) {
this.state.statusLine = "Decoder: zxing — video element missing";
return;
}
if (!this._canvas) {
this._canvas = document.createElement("canvas");
this._ctx = this._canvas.getContext("2d", { willReadFrequently: true });
}
// Constrain ZXing to QR codes only — skips all the other
// 1D / 2D format probes (Code 128, EAN, PDF417, etc.) that
// double the per-frame cost without helping us.
const reader = new window.ZXing.BrowserMultiFormatReader();
try {
const hints = new Map();
// DecodeHintType.POSSIBLE_FORMATS = 2 in zxing-js
hints.set(2, [window.ZXing.BarcodeFormat.QR_CODE]);
reader.hints = hints;
} catch (e) {
// Older ZXing versions don't expose hints this way; fine,
// just decode all formats.
}
let frames = 0;
let attempts = 0;
let lastDecode = 0;
let lastStatus = 0;
let lastResult = "—";
const MIN_INTERVAL_MS = 100;
const STATUS_INTERVAL_MS = 500;
const tick = (now) => {
if (!this.decodeLoopActive || !this.state.open) return;
frames++;
if (
v.readyState >= 2 &&
v.videoWidth && v.videoHeight &&
(now - lastDecode) >= MIN_INTERVAL_MS
) {
lastDecode = now;
attempts++;
try {
const w = v.videoWidth;
const h = v.videoHeight;
if (this._canvas.width !== w) this._canvas.width = w;
if (this._canvas.height !== h) this._canvas.height = h;
this._ctx.drawImage(v, 0, 0, w, h);
// ZXing's decodeFromCanvas returns a Result on
// success and throws NotFoundException on miss.
const result = reader.decodeFromCanvas(this._canvas);
const text = result && (result.getText ? result.getText() : result.text);
if (text) {
lastResult = "found";
this._handleCode(text);
return;
}
lastResult = "empty";
} catch (e) {
// NotFoundException = no QR in frame — common,
// not an error. Anything else we surface.
const name = e && (e.name || (e.constructor && e.constructor.name));
if (name === "NotFoundException" || name === "NotFoundException2") {
lastResult = "no_code";
} else {
lastResult = "err: " + ((e && e.message) || String(e)).slice(0, 50);
}
}
}
if (now - lastStatus > STATUS_INTERVAL_MS) {
lastStatus = now;
this.state.statusLine =
"zxing · f" + frames +
" a" + attempts +
" " + (v.videoWidth || 0) + "x" + (v.videoHeight || 0) +
" rs" + v.readyState +
" r:" + lastResult;
}
requestAnimationFrame(tick);
};
requestAnimationFrame(tick);
}
/**
* Decode loop using the vendored jsQR library. Draws each video
* frame into an offscreen canvas, pulls ImageData, and runs jsQR