Barcode Reader Scan and decode barcodes from uploaded images to extract the encoded data.

The tool works by first creating a URL object from the uploaded image file using `URL.createObjectURL`, which is then set as the source of an `Image` element. Once the image is loaded, it is drawn onto a hidden canvas element using the 2D drawing context (`ctx`). If the browser supports the BarcodeDetector API (currently Chrome and Edge), it creates a new instance of `BarcodeDetector` and passes the bitmap representation of the canvas to its `detect` method. The results are then processed to extract the decoded value and format, which are stored in the component's state using `setDecoded`.

If the browser does not support the BarcodeDetector API, or if the detection fails, it falls back to a Canvas-based scanning algorithm. This involves converting the image to grayscale and analyzing scan lines for bar-width patterns that match known barcode formats such as CODE128, EAN-13, UPC-A, and Code39. The algorithm detects start/stop patterns, measures bar widths, and decodes format-specific rules. Check digits are validated to ensure accuracy. The decoded data is stored in the component's state using `setDecoded`, which triggers a re-render of the component to display the results.

The tool uses React hooks such as `useState` and `useCallback` to manage its state and handle events, including file uploads and button clicks. The `FileDropzone` component from the `@/components/shared/FileDropzone` module is used to handle file uploads, while the `canvasRef` variable holds a reference to the hidden canvas element. The `createImageBitmap` function is used to create a bitmap representation of the canvas, which is then passed to the BarcodeDetector API or analyzed using the Canvas-based scanning algorithm.