qr-scanner.min.js

class e{static hasCamera(){return navigator.mediaDevices.enumerateDevices().then(a=>a.some(a=>"videoinput"===a.kind)).catch(()=>!1)}constructor(a,b,c="environment",d=e.DEFAULT_CANVAS_SIZE){this.$video=a;this.$canvas=document.createElement("canvas");this._onDecode=b;this._paused=this._active=!1;this._defaultFacingMode=c;this.$canvas.width=d;this.$canvas.height=d;this._sourceRect={x:0,y:0,width:d,height:d};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=this._defaultFacingMode,b="user"===this._defaultFacingMode?"environment":"user";return this._getCameraStream(this._defaultFacingMode,
!0).catch(()=>this._getCameraStream(b,!1)).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.$video.srcObject=null)},300)))}static scanImage(a,b=null,c=null,d=null,f=!1,g=!1){let h=!1,l=new Promise((l,g)=>{c||
(c=new Worker(e.WORKER_PATH),h=!0,c.postMessage({type:"inversionMode",data:"both"}));let n,m,k;m=a=>{"qrResult"===a.data.type&&(c.removeEventListener("message",m),c.removeEventListener("error",k),clearTimeout(n),null!==a.data.data?l(a.data.data):g("QR code not found."))};k=a=>{c.removeEventListener("message",m);c.removeEventListener("error",k);clearTimeout(n);g("Scanner error: "+(a?a.message||a:"Unknown Error"))};c.addEventListener("message",m);c.addEventListener("error",k);n=setTimeout(()=>k("timeout"),
3E3);e._loadImage(a).then(a=>{a=e._getImageData(a,b,d,f);c.postMessage({type:"decode",data:a},[a.data.buffer])}).catch(k)});b&&g&&(l=l.catch(()=>e.scanImage(a,null,c,d,f)));return l=l.finally(()=>{h&&c.postMessage({type:"close"})})}setGrayscaleWeights(a,b,c,d=!0){this._qrWorker.postMessage({type:"grayscaleWeights",data:{red:a,green:b,blue:c,useIntegerApproximation:d}})}setInversionMode(a){this._qrWorker.postMessage({type:"inversionMode",data:a})}_onCanPlay(){this._updateSourceRect();this.$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,b=!1){let c=[{width:{min:1024}},{width:{min:768}},{}];a&&(b&&(a={exact:a}),c.forEach(b=>b.facingMode=a));return this._getMatchingCameraStream(c)}_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,b=null,c=null,d=!1){c=c||document.createElement("canvas");let f=b&&b.x?b.x:0,g=b&&b.y?b.y:0,h=b&&b.width?b.width:a.width||a.videoWidth;b=b&&b.height?b.height:a.height||a.videoHeight;d||c.width===h&&c.height===b||(c.width=h,c.height=b);d=c.getContext("2d",{alpha:!1});d.imageSmoothingEnabled=!1;d.drawImage(a,f,g,h,b,0,0,c.width,c.height);return d.getImageData(0,0,c.width,c.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 b=new Image;b.src=a instanceof File?URL.createObjectURL(a):a;return e._awaitImageLoad(b).then(()=>{a instanceof File&&URL.revokeObjectURL(b.src);return b})}return Promise.reject("Unsupported image type.")}static _awaitImageLoad(a){return new Promise((b,
c)=>{if(a.complete&&0!==a.naturalWidth)b();else{let d,f;d=()=>{a.removeEventListener("load",d);a.removeEventListener("error",f);b()};f=()=>{a.removeEventListener("load",d);a.removeEventListener("error",f);c("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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