Icard/angular-clarity-master(work.../node_modules/qrcode/lib/renderer/utils.js

100 lines
2.8 KiB
JavaScript

function hex2rgba (hex) {
if (typeof hex === 'number') {
hex = hex.toString()
}
if (typeof hex !== 'string') {
throw new Error('Color should be defined as hex string')
}
let hexCode = hex.slice().replace('#', '').split('')
if (hexCode.length < 3 || hexCode.length === 5 || hexCode.length > 8) {
throw new Error('Invalid hex color: ' + hex)
}
// Convert from short to long form (fff -> ffffff)
if (hexCode.length === 3 || hexCode.length === 4) {
hexCode = Array.prototype.concat.apply([], hexCode.map(function (c) {
return [c, c]
}))
}
// Add default alpha value
if (hexCode.length === 6) hexCode.push('F', 'F')
const hexValue = parseInt(hexCode.join(''), 16)
return {
r: (hexValue >> 24) & 255,
g: (hexValue >> 16) & 255,
b: (hexValue >> 8) & 255,
a: hexValue & 255,
hex: '#' + hexCode.slice(0, 6).join('')
}
}
exports.getOptions = function getOptions (options) {
if (!options) options = {}
if (!options.color) options.color = {}
const margin = typeof options.margin === 'undefined' ||
options.margin === null ||
options.margin < 0
? 4
: options.margin
const width = options.width && options.width >= 21 ? options.width : undefined
const scale = options.scale || 4
return {
width: width,
scale: width ? 4 : scale,
margin: margin,
color: {
dark: hex2rgba(options.color.dark || '#000000ff'),
light: hex2rgba(options.color.light || '#ffffffff')
},
type: options.type,
rendererOpts: options.rendererOpts || {}
}
}
exports.getScale = function getScale (qrSize, opts) {
return opts.width && opts.width >= qrSize + opts.margin * 2
? opts.width / (qrSize + opts.margin * 2)
: opts.scale
}
exports.getImageWidth = function getImageWidth (qrSize, opts) {
const scale = exports.getScale(qrSize, opts)
return Math.floor((qrSize + opts.margin * 2) * scale)
}
exports.qrToImageData = function qrToImageData (imgData, qr, opts) {
const size = qr.modules.size
const data = qr.modules.data
const scale = exports.getScale(size, opts)
const symbolSize = Math.floor((size + opts.margin * 2) * scale)
const scaledMargin = opts.margin * scale
const palette = [opts.color.light, opts.color.dark]
for (let i = 0; i < symbolSize; i++) {
for (let j = 0; j < symbolSize; j++) {
let posDst = (i * symbolSize + j) * 4
let pxColor = opts.color.light
if (i >= scaledMargin && j >= scaledMargin &&
i < symbolSize - scaledMargin && j < symbolSize - scaledMargin) {
const iSrc = Math.floor((i - scaledMargin) / scale)
const jSrc = Math.floor((j - scaledMargin) / scale)
pxColor = palette[data[iSrc * size + jSrc] ? 1 : 0]
}
imgData[posDst++] = pxColor.r
imgData[posDst++] = pxColor.g
imgData[posDst++] = pxColor.b
imgData[posDst] = pxColor.a
}
}
}