codify-node
Version:
Generates 1D, 2D, and composite barcodes in png, svg, or eps formats.
72 lines • 2.18 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const pngjs_1 = require("pngjs");
function blobToBase64(png) {
const chunks = [];
return new Promise((resolve) => {
png.pack();
png.on('data', (c) => chunks.push(c));
png.on('end', () => {
const result = Buffer.concat(chunks);
resolve('data:image/png;base64,' + result.toString('base64'));
});
});
}
function getBuffer(png) {
return pngjs_1.PNG.sync.write(png);
}
function getRgbaColor(hex = '000000FF') {
const colors = [
...hex.match(/^([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})?$/i) ?? []
];
const alpha = parseInt(colors[4], 16);
if (colors.length >= 3) {
return {
red: parseInt(colors[1], 16),
green: parseInt(colors[2], 16),
blue: parseInt(colors[3], 16),
alpha: !isNaN(alpha) ? alpha : 255
};
}
return {
red: 0,
green: 0,
blue: 0,
alpha: 255
};
}
function isEqualColor(a, b) {
return a.red === b.red && a.green === b.green && a.blue === b.blue;
}
function render(bitmap, width, height, backgroundColor, foregroundColor) {
const png = new pngjs_1.PNG({ width, height });
const backgroundColorRgba = getRgbaColor(backgroundColor);
const foregroundColorRgba = getRgbaColor(foregroundColor);
let i = 0;
for (let y = 0; y < height; y++) {
for (let x = 0; x < width; x++) {
const color = {
red: bitmap[i],
green: bitmap[i + 1],
blue: bitmap[i + 2]
};
const rgba = isEqualColor(color, backgroundColorRgba)
? backgroundColorRgba
: foregroundColorRgba;
const pos = (png.width * y + x) << 2;
png.data[pos] = rgba.red;
png.data[pos + 1] = rgba.green;
png.data[pos + 2] = rgba.blue;
png.data[pos + 3] = rgba.alpha || 0;
i += 3;
}
}
return png;
}
exports.default = {
blobToBase64,
getBuffer,
getRgbaColor,
render
};
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