covid-green-dcc-file-decoder/dist/decode/image.js

<img alttext="COVID Green Logo" src="https://raw.githubusercontent.com/lfph/artwork/master/projects/covidgreen/stacked/color/covidgreen-stacked-color.png" width="300" />

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.extractQRFromImage = void 0;
const jsqr_1 = __importDefault(require("jsqr"));
const jimp_1 = __importDefault(require("jimp"));
// import path from 'path'
const util_1 = require("../util");
const splitImage = (source) => __awaiter(void 0, void 0, void 0, function* () {
    // Parse the image using Jimp.read() method
    const uncroppedLeft = yield jimp_1.default.read(source);
    const uncroppedRight = yield jimp_1.default.read(source);
    yield uncroppedLeft.crop(0, 0, Math.ceil(uncroppedLeft.bitmap.width / 2), uncroppedLeft.bitmap.height);
    // uncroppedLeft.write(path.join(__dirname, 'myimage1.png'))
    const width = Math.floor(uncroppedRight.bitmap.width / 2);
    const offset = Math.floor(width * 0.1);
    yield uncroppedRight.crop(width - offset, 0, width + offset, uncroppedRight.bitmap.height);
    // uncroppedRight.write(path.join(__dirname, 'myimage2.png'))
    return [uncroppedRight, uncroppedLeft];
});
const findQR = (images) => {
    const qrCodes = [];
    for (const image of images) {
        const qrObj = jsqr_1.default(image.bitmap.data, image.bitmap.width, image.bitmap.height);
        if (qrObj === null || qrObj === void 0 ? void 0 : qrObj.data) {
            qrCodes.push(qrObj.data || Buffer.from(qrObj.binaryData).toString());
        }
    }
    return qrCodes;
};
function extractQRFromImage(sourceImage) {
    return __awaiter(this, void 0, void 0, function* () {
        const image = yield jimp_1.default.read(sourceImage);
        let qrs = findQR([image]);
        if (qrs.length === 0) {
            // half image vertically
            const parts = yield splitImage(sourceImage);
            qrs = findQR(parts);
        }
        if (qrs.length === 0) {
            throw util_1.qrNotDetected();
        }
        return qrs;
    });
}
exports.extractQRFromImage = extractQRFromImage;