native-bar-code-detector.js
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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());
});
};
import { QrcodeResultFormat, Html5QrcodeSupportedFormats } from "./core";
export class BarcodeDetectorDelegate {
static isSupported() {
if (!("BarcodeDetector" in window)) {
return false;
}
const dummyDetector = new BarcodeDetector({ formats: ["qr_code"] });
return typeof dummyDetector !== "undefined";
}
constructor(requestedFormats, verbose, logger) {
this.formatMap = new Map([
[Html5QrcodeSupportedFormats.QR_CODE, "qr_code"],
[Html5QrcodeSupportedFormats.AZTEC, "aztec"],
[Html5QrcodeSupportedFormats.CODABAR, "codabar"],
[Html5QrcodeSupportedFormats.CODE_39, "code_39"],
[Html5QrcodeSupportedFormats.CODE_93, "code_93"],
[Html5QrcodeSupportedFormats.CODE_128, "code_128"],
[Html5QrcodeSupportedFormats.DATA_MATRIX, "data_matrix"],
[Html5QrcodeSupportedFormats.ITF, "itf"],
[Html5QrcodeSupportedFormats.EAN_13, "ean_13"],
[Html5QrcodeSupportedFormats.EAN_8, "ean_8"],
[Html5QrcodeSupportedFormats.PDF_417, "pdf417"],
[Html5QrcodeSupportedFormats.UPC_A, "upc_a"],
[Html5QrcodeSupportedFormats.UPC_E, "upc_e"]
]);
this.reverseFormatMap = this.createReverseFormatMap();
if (!BarcodeDetectorDelegate.isSupported()) {
throw "Use html5qrcode.min.js without edit, Use "
+ "BarcodeDetectorDelegate only if it isSupported();";
}
this.verbose = verbose;
this.logger = logger;
const formats = this.createBarcodeDetectorFormats(requestedFormats);
this.detector = new BarcodeDetector(formats);
if (!this.detector) {
throw "BarcodeDetector detector not supported";
}
}
decodeAsync(canvas) {
return __awaiter(this, void 0, void 0, function* () {
const barcodes = yield this.detector.detect(canvas);
if (!barcodes || barcodes.length === 0) {
throw "No barcode or QR code detected.";
}
let largestBarcode = this.selectLargestBarcode(barcodes);
return {
text: largestBarcode.rawValue,
format: QrcodeResultFormat.create(this.toHtml5QrcodeSupportedFormats(largestBarcode.format)),
debugData: this.createDebugData()
};
});
}
selectLargestBarcode(barcodes) {
let largestBarcode = null;
let maxArea = 0;
for (let barcode of barcodes) {
let area = barcode.boundingBox.width * barcode.boundingBox.height;
if (area > maxArea) {
maxArea = area;
largestBarcode = barcode;
}
}
if (!largestBarcode) {
throw "No largest barcode found";
}
return largestBarcode;
}
createBarcodeDetectorFormats(requestedFormats) {
let formats = [];
for (const requestedFormat of requestedFormats) {
if (this.formatMap.has(requestedFormat)) {
formats.push(this.formatMap.get(requestedFormat));
}
else {
this.logger.warn(`${requestedFormat} is not supported by`
+ "BarcodeDetectorDelegate");
}
}
return { formats: formats };
}
toHtml5QrcodeSupportedFormats(barcodeDetectorFormat) {
if (!this.reverseFormatMap.has(barcodeDetectorFormat)) {
throw `reverseFormatMap doesn't have ${barcodeDetectorFormat}`;
}
return this.reverseFormatMap.get(barcodeDetectorFormat);
}
createReverseFormatMap() {
let result = new Map();
this.formatMap.forEach((value, key, _) => {
result.set(value, key);
});
return result;
}
createDebugData() {
return { decoderName: "BarcodeDetector" };
}
}
//# sourceMappingURL=native-bar-code-detector.js.map