qr-scanner.min.js

class e {
    static hasCamera() { return navigator.mediaDevices.enumerateDevices().then((a) => a.some((a) => "videoinput" === a.kind)).catch(() => !1) } constructor(a, c, b = e.DEFAULT_CANVAS_SIZE) {
    this.$video = a; this.$canvas = document.createElement("canvas"); this._onDecode = c; this._paused = this._active = !1; this.$canvas.width = b; this.$canvas.height = b; this._sourceRect = { x: 0, y: 0, width: b, height: b }; this._onCanPlay = this._onCanPlay.bind(this); this._onPlay = this._onPlay.bind(this); this._onVisibilityChange = this._onVisibilityChange.bind(this);
        this.$video.addEventListener("canplay", this._onCanPlay); this.$video.addEventListener("play", this._onPlay); document.addEventListener("visibilitychange", this._onVisibilityChange); this._qrWorker = new Worker(e.WORKER_PATH)
    } destroy() { this.$video.removeEventListener("canplay", this._onCanPlay); this.$video.removeEventListener("play", this._onPlay); document.removeEventListener("visibilitychange", this._onVisibilityChange); this.stop(); this._qrWorker.postMessage({ type: "close" }) } start() {
        if (this._active && !this._paused) return Promise.resolve();
        "https:" !== window.location.protocol && console.warn("The camera stream is only accessible if the page is transferred via https."); this._active = !0; this._paused = !1; if (document.hidden) return Promise.resolve(); clearTimeout(this._offTimeout); this._offTimeout = null; if (this.$video.srcObject) return this.$video.play(), Promise.resolve(); let a = "environment"; return this._getCameraStream("environment", !0).catch(() => { a = "user"; return this._getCameraStream() }).then((c) => { this.$video.srcObject = c; this._setVideoMirror(a) }).catch((a) => { this._active = !1; throw a; })
    } stop() { this.pause(); this._active = !1 } pause() { this._paused = !0; this._active && (this.$video.pause(), this._offTimeout || (this._offTimeout = setTimeout(() => { let a = this.$video.srcObject && this.$video.srcObject.getTracks()[0]; a && (a.stop(), this._offTimeout = this.$video.srcObject = null) }, 300))) } static scanImage(a, c = null, b = null, d = null, f = !1, g = !1) {
        let h = !1, l = new Promise((l, g) => {
            b || (b = new Worker(e.WORKER_PATH), h = !0, b.postMessage({ type: "inversionMode", data: "both" })); let n, m, k; m = (a) => {
            "qrResult" ===
                a.data.type && (b.removeEventListener("message", m), b.removeEventListener("error", k), clearTimeout(n), null !== a.data.data ? l(a.data.data) : g("QR code not found."))
            }; k = (a) => { b.removeEventListener("message", m); b.removeEventListener("error", k); clearTimeout(n); g("Scanner error: " + (a ? a.message || a : "Unknown Error")) }; b.addEventListener("message", m); b.addEventListener("error", k); n = setTimeout(() => k("timeout"), 3E3); e._loadImage(a).then((a) => { a = e._getImageData(a, c, d, f); b.postMessage({ type: "decode", data: a }, [a.data.buffer]) }).catch(k)
        });
        c && g && (l = l.catch(() => e.scanImage(a, null, b, d, f))); return l = l.finally(() => { h && b.postMessage({ type: "close" }) })
    } setGrayscaleWeights(a, c, b, d = !0) { this._qrWorker.postMessage({ type: "grayscaleWeights", data: { red: a, green: c, blue: b, useIntegerApproximation: d } }) } setInversionMode(a) { this._qrWorker.postMessage({ type: "inversionMode", data: a }) } _onCanPlay() { this._updateSourceRect(); this.$video.play() } _onPlay() { this._updateSourceRect(); this._scanFrame() } _onVisibilityChange() {
        document.hidden ? this.pause() : this._active &&
            this.start()
    } _updateSourceRect() { let a = Math.round(2 / 3 * Math.min(this.$video.videoWidth, this.$video.videoHeight)); this._sourceRect.width = this._sourceRect.height = a; this._sourceRect.x = (this.$video.videoWidth - a) / 2; this._sourceRect.y = (this.$video.videoHeight - a) / 2 } _scanFrame() {
        if (!this._active || this.$video.paused || this.$video.ended) return !1; requestAnimationFrame(() => {
            e.scanImage(this.$video, this._sourceRect, this._qrWorker, this.$canvas, !0).then(this._onDecode, (a) => {
            this._active && "QR code not found." !== a &&
                console.error(a)
            }).then(() => this._scanFrame())
        })
    } _getCameraStream(a, c = !1) { let b = [{ width: { min: 1024 } }, { width: { min: 768 } }, {}]; a && (c && (a = { exact: a }), b.forEach((b) => b.facingMode = a)); return this._getMatchingCameraStream(b) } _getMatchingCameraStream(a) { return 0 === a.length ? Promise.reject("Camera not found.") : navigator.mediaDevices.getUserMedia({ video: a.shift() }).catch(() => this._getMatchingCameraStream(a)) } _setVideoMirror(a) { this.$video.style.transform = "scaleX(" + ("user" === a ? -1 : 1) + ")" } static _getImageData(a, c =
        null, b = null, d = !1) { b = b || document.createElement("canvas"); let f = c && c.x ? c.x : 0, g = c && c.y ? c.y : 0, h = c && c.width ? c.width : a.width || a.videoWidth; c = c && c.height ? c.height : a.height || a.videoHeight; d || b.width === h && b.height === c || (b.width = h, b.height = c); d = b.getContext("2d", { alpha: !1 }); d.imageSmoothingEnabled = !1; d.drawImage(a, f, g, h, c, 0, 0, b.width, b.height); return d.getImageData(0, 0, b.width, b.height) } static _loadImage(a) {
            if (a instanceof HTMLCanvasElement || a instanceof HTMLVideoElement || window.ImageBitmap && a instanceof window.ImageBitmap ||
                window.OffscreenCanvas && a instanceof window.OffscreenCanvas) return Promise.resolve(a); if (a instanceof Image) return e._awaitImageLoad(a).then(() => a); if (a instanceof File || a instanceof URL || "string" === typeof a) { let c = new Image; c.src = a instanceof File ? URL.createObjectURL(a) : a; return e._awaitImageLoad(c).then(() => { a instanceof File && URL.revokeObjectURL(c.src); return c }) } return Promise.reject("Unsupported image type.")
        } static _awaitImageLoad(a) {
            return new Promise((c, b) => {
                if (a.complete && 0 !== a.naturalWidth) c();
                else { let d, f; d = () => { a.removeEventListener("load", d); a.removeEventListener("error", f); c() }; f = () => { a.removeEventListener("load", d); a.removeEventListener("error", f); b("Image load error") }; a.addEventListener("load", d); a.addEventListener("error", f) }
            })
        }
} e.DEFAULT_CANVAS_SIZE = 400; e.WORKER_PATH = "qr-scanner-worker.min.js"; export default e;
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