chore: bw images on xwing

lib/scanner-node.js

@@ -4,6 +4,7 @@ const Pdf417Parser = require('./compliance/parsepdf417')
 const { utils: coinUtils } = require('@lamassu/coins')
 const { cameraExists, stream } = require('./capture/streamer/v4l2camera')
 const scanner = require('./capture/scanner/zxing')
+const sharp = require('sharp')
 
 const DEFAULT_FPS = 10
 const DEFAULT_DELAYEDSHOT_DELAY = 3
@@ -138,7 +139,7 @@ const capture = (device, config, returnCallback, stillsCallback, process) => {
 
     activeStream.on('close', externallyClosedHandler)
 
-      activeStream.on('data', async (frame) => {
+    activeStream.on('data', async (frame) => {
       if (processing) return
       processing = true
       const result = await process(frame)
@@ -168,7 +169,8 @@ const scanPDF417 = (resultCallback, idCardStillsCallback) => {
   const device = getCameraDevice(mode)
 
   capture(device, {}, resultCallback, idCardStillsCallback, async frame => {
-    const result = await scanner.scanPDF417(frame)
+    const bwFrame = await sharp(frame).greyscale().toBuffer()
+    const result = await scanner.scanPDF417(bwFrame)
     return result ? Pdf417Parser.parse(result) : null
   })
 }
@@ -177,15 +179,20 @@ const scanQR = (resultCallback) => {
   const mode = 'qr'
   const device = getCameraDevice(mode)
 
-  capture(device, {}, resultCallback, _.noop, scanner.scanQRcode)
+  capture(device, {}, resultCallback, _.noop, async frame => {
+      const bwFrame = await sharp(frame).greyscale().toBuffer()
+      return scanner.scanQRcode(bwFrame)
+    }
+  )
 }
 
 const scanMainQR = (cryptoCode, qrStillsCallback, resultCallback) => {
   const mode = 'qr'
   const device = getCameraDevice(mode)
 
   capture(device, {}, resultCallback, qrStillsCallback, async frame => {
-    const code = await scanner.scanQRcode(frame)
+    const bwFrame = await sharp(frame).greyscale().toBuffer()
+    const code = await scanner.scanQRcode(bwFrame)
     const network = 'main'
 
     if (!code) return null