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