The pure-JS @zxing/library locator is weak on real ЧЗ codes (decoded 1/4 of the
test photos with correct grayscale input; libdmtx and zxing-wasm read 3/4 — the
4th is physically undecodable). Symptom: scanner takes very long to even find a
code, 2 of 4 never read.
- Bundle zxing-wasm reader as an IIFE (frontend/lib/zxing-wasm.js, global
ZXingWASM) + zxing_reader.wasm; drop frontend/lib/zxing.js. Init fetches the
.wasm as an arrayBuffer and hands it over as wasmBinary (no streaming/MIME/CDN).
- ChZ.zxReady()/ChZ.decodeImageData() (chzn.js): decode an ImageData -> raw GS1
bytes (result.bytes keeps the GS separators) with tryHarder/tryRotate/tryInvert.
- Scanner (main.js) rewritten to a canvas loop: crop the central ROI, upscale to
540px, decode each frame — full-frame search was the slow/unreliable part.
Photo path decodes the picked image the same way.
Not yet verified on-device (WebView WASM instantiation); decoder logic validated
in a Node harness against the 4 sample photos.
- Native BarcodeDetector needs Google Play Services (fails "Barcode detection
service unavailable" on de-Googled ROMs). Replace it with a bundled, fully
offline ZXing decoder (frontend/lib/zxing.js, @zxing/library UMD): scanner uses
BrowserDatamatrixCodeReader (TRY_HARDER) for live camera and decodeFromImageUrl
for the photo fallback. No Google, codes never leave the device.
- Source badge "ЧЗ" (src-chzn) for products added via the scanner.
- tools/chzn_export.sh: adb push the exported session to the device Downloads so
BalDav's file picker can import it directly.
- leaflet-rotate plugin: map rotates by compass heading via deviceorientation
- Landscape detection: CSS viewport rotation when phone held sideways (gamma > 50)
- Bottom nav hidden in landscape mode
- GPS placeholder: pixel art overlay shown until GPS signal arrives
- invalidateSize() after map init to prevent black screen
