79 lines
1.7 KiB
JavaScript
79 lines
1.7 KiB
JavaScript
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const fs = require('fs')
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const PNG = require('pngjs').PNG
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const Utils = require('./utils')
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exports.render = function render (qrData, options) {
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const opts = Utils.getOptions(options)
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const pngOpts = opts.rendererOpts
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const size = Utils.getImageWidth(qrData.modules.size, opts)
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pngOpts.width = size
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pngOpts.height = size
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const pngImage = new PNG(pngOpts)
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Utils.qrToImageData(pngImage.data, qrData, opts)
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return pngImage
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}
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exports.renderToDataURL = function renderToDataURL (qrData, options, cb) {
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if (typeof cb === 'undefined') {
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cb = options
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options = undefined
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}
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exports.renderToBuffer(qrData, options, function (err, output) {
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if (err) cb(err)
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let url = 'data:image/png;base64,'
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url += output.toString('base64')
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cb(null, url)
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})
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}
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exports.renderToBuffer = function renderToBuffer (qrData, options, cb) {
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if (typeof cb === 'undefined') {
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cb = options
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options = undefined
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}
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const png = exports.render(qrData, options)
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const buffer = []
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png.on('error', cb)
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png.on('data', function (data) {
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buffer.push(data)
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})
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png.on('end', function () {
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cb(null, Buffer.concat(buffer))
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})
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png.pack()
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}
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exports.renderToFile = function renderToFile (path, qrData, options, cb) {
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if (typeof cb === 'undefined') {
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cb = options
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options = undefined
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}
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let called = false
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const done = (...args) => {
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if (called) return
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called = true
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cb.apply(null, args)
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}
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const stream = fs.createWriteStream(path)
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stream.on('error', done)
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stream.on('close', done)
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exports.renderToFileStream(stream, qrData, options)
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}
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exports.renderToFileStream = function renderToFileStream (stream, qrData, options) {
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const png = exports.render(qrData, options)
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png.pack().pipe(stream)
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}
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