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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3364x 1764x 1764x 1764x 3364x 1600x 1600x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 58x 3364x 3364x 58x 1x 1x 1x 1x 1x 1x | import { gifImage } from './gif-image.render.js'
import { ByteArrayOutputStream } from '../utils/bite-array-output-stream.js'
import { bytesToBase64 } from '../utils/text-decode-encode.util.js'
/**
*
* @param {object} opts - function parameters
* @param {number} [opts.cellSize] - cell size in pixels, defaults to 2
* @param {number} [opts.margin] - margin in pixels, defaults to {@link cellSize} * 4
* @param {import('../qr-code.js').QrCode} opts.qrcode - QR Code data
* @returns {string} data url of qr code image
*/
export function createDataURL ({ cellSize = 2, margin, qrcode }) {
margin ??= cellSize * 4
const size = qrcode.moduleCount * cellSize + margin * 2
const min = margin
const max = size - margin
return createDataURLAux(size, size, function (x, y) {
if (min <= x && x < max && min <= y && y < max) {
const c = Math.floor((x - min) / cellSize)
const r = Math.floor((y - min) / cellSize)
return qrcode.isDark(r, c) ? 0 : 1
} else {
return 1
}
})
};
/**
*
* @param {number} width - image width
* @param {number} height - image height
* @param {(x: number, y:number) => number} getPixel - get pixel function
* @returns {string} data url of qr code image
*/
function createDataURLAux (width, height, getPixel) {
const gif = gifImage(width, height)
for (let y = 0; y < height; y += 1) {
for (let x = 0; x < width; x += 1) {
gif.setPixel(x, y, getPixel(x, y))
}
}
const b = new ByteArrayOutputStream()
gif.write(b)
const base64 = bytesToBase64(b.toByteArray())
return 'data:image/gif;base64,' + base64
};
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