MobileScannerState.size is not equal to BarcodeCapture.size on iOS

[jsroest]

Hi,

I would like to implement a picklist mode.

This is a scanning mode known from manufacturers like Zebra and Honeywell, where the user is able to mark and scan precisely a single barcode from a barcode sheet (a paper sheet containing a large number of barcodes). With these hardware devices, a laser crosshair is projected by the barcodescanner and only the barcode that intersects with that crosshair is scanned.

To have something similar, I project a red crosshair above the mobile_scanner live-camera feed. Touching the screen temporarily ignores any detected barcodes, to give the user the opportunity to move to the right barcode to scan. The crosshair is drawn in a green color, to give the user feedback that the scanning is temporarily disabled.

The idea is that once the user touches a single barcode with the (active) crosshair, that single barcode is scanned.

For this to work, I need the following:

1. The corners of the detected barcodes
2. The size of the image to have a reference for the corners

The corners for each barcode are passed in the BarcodeCapture.barcode.corners, which is great.

I do have issues finding the size of the image.

I preferably do not want to receive the image in the BarcodeCapture, because I expect unnecessary performance issues with passing the image to the dart side only for having the size as a reference.

Here some samples where I place a barcode as much as possible to the lower-right corner of the camera feed.

Android 9 on a Galaxy S8 MobileScannerState.size = Size(480.0, 640.0) BarcodeCapture.size = Size(480.0, 640.0) BarcodeCapture.barcodes[0].corners = [Offset(272.0, 570.0), Offset(479.0, 566.0), Offset(486.0, 631.0), Offset(280.0, 638.0)]

iOS 18, on a iPhone 15 MobileScannerState.size = Size(3024.0, 4032.0) BarcodeCapture.size = Size(1178.0, 1572.0) BarcodeCapture.barcodes[0].corners = [Offset(731.0, 1409.0), Offset(1110.0, 1407.0), Offset(1115.0, 1540.0), Offset(736.0, 1547.0)]

My question boils down to the following:

1. Is it a bug that MobileScannerState.size is not equal to BarcodeCapture.size on iOS?
2. If it's not a bug, how can I get the size of the image where the barcode.corners are placed on, without setting returnImage to true in the BarcodeController.