javascript-barcode-reader/src/utilities/createImageData.ts

Simple & Fast Barcode decoder for Browser and Node.js

import { ImageDataLike } from './ImageDataLike'

export function createImageData(image: HTMLImageElement): ImageDataLike {
  const canvas = document.createElement('canvas')
  const ctx = canvas.getContext('2d')

  if (!ctx) throw new Error('Cannot create canvas 2d context')

  const width = image.naturalWidth
  const height = image.naturalHeight

  canvas.width = width
  canvas.height = height
  ctx.drawImage(image, 0, 0)

  return ctx.getImageData(0, 0, width, height)
}