@zxing/browser
Version:
ZXing for JS's browser layer.
1 lines • 395 kB
JavaScript
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c=255&i[0],f=255&i[1];for(s=1;s<o-1;s++){var h=255&i[s+1];(4*f-c-h)/2<u&&r.set(s),c=f,f=h}}return r},e.prototype.getBlackMatrix=function(){var t=this.getLuminanceSource(),r=t.getWidth(),n=t.getHeight(),o=new k(r,n);this.initArrays(r);for(var i=this.buckets,a=1;a<5;a++)for(var s=Math.floor(n*a/5),u=t.getRow(s,this.luminances),c=Math.floor(4*r/5),f=Math.floor(r/5);f<c;f++){i[(255&u[f])>>e.LUMINANCE_SHIFT]++}var h=e.estimateBlackPoint(i),l=t.getMatrix();for(a=0;a<n;a++){var d=a*r;for(f=0;f<r;f++){(255&l[d+f])<h&&o.set(f,a)}}return o},e.prototype.createBinarizer=function(t){return new e(t)},e.prototype.initArrays=function(t){this.luminances.length<t&&(this.luminances=new Uint8ClampedArray(t));for(var r=this.buckets,n=0;n<e.LUMINANCE_BUCKETS;n++)r[n]=0},e.estimateBlackPoint=function(t){for(var r=t.length,n=0,o=0,i=0,a=0;a<r;a++)t[a]>i&&(o=a,i=t[a]),t[a]>n&&(n=t[a]);var s=0,u=0;for(a=0;a<r;a++){var c=a-o;(d=t[a]*c*c)>u&&(s=a,u=d)}if(o>s){var f=o;o=s,s=f}if(s-o<=r/16)throw new V;var h=s-1,l=-1;for(a=s-1;a>o;a--){var d,p=a-o;(d=p*p*(s-a)*(n-t[a]))>l&&(h=a,l=d)}return h<<e.LUMINANCE_SHIFT},e.LUMINANCE_BITS=5,e.LUMINANCE_SHIFT=8-e.LUMINANCE_BITS,e.LUMINANCE_BUCKETS=1<<e.LUMINANCE_BITS,e.EMPTY=Uint8ClampedArray.from([0]),e}(g),G=function(){var t=function(e,r){return t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var r in e)e.hasOwnProperty(r)&&(t[r]=e[r])},t(e,r)};return function(e,r){function n(){this.constructor=e}t(e,r),e.prototype=null===r?Object.create(r):(n.prototype=r.prototype,new n)}}(),X=function(t){function e(e){var r=t.call(this,e)||this;return r.matrix=null,r}return G(e,t),e.prototype.getBlackMatrix=function(){if(null!==this.matrix)return this.matrix;var r=this.getLuminanceSource(),n=r.getWidth(),o=r.getHeight();if(n>=e.MINIMUM_DIMENSION&&o>=e.MINIMUM_DIMENSION){var i=r.getMatrix(),a=n>>e.BLOCK_SIZE_POWER;0!=(n&e.BLOCK_SIZE_MASK)&&a++;var s=o>>e.BLOCK_SIZE_POWER;0!=(o&e.BLOCK_SIZE_MASK)&&s++;var u=e.calculateBlackPoints(i,a,s,n,o),c=new k(n,o);e.calculateThresholdForBlock(i,a,s,n,o,u,c),this.matrix=c}else this.matrix=t.prototype.getBlackMatrix.call(this);return this.matrix},e.prototype.createBinarizer=function(t){return new e(t)},e.calculateThresholdForBlock=function(t,r,n,o,i,a,s){for(var u=i-e.BLOCK_SIZE,c=o-e.BLOCK_SIZE,f=0;f<n;f++){var h=f<<e.BLOCK_SIZE_POWER;h>u&&(h=u);for(var l=e.cap(f,2,n-3),d=0;d<r;d++){var p=d<<e.BLOCK_SIZE_POWER;p>c&&(p=c);for(var g=e.cap(d,2,r-3),w=0,y=-2;y<=2;y++){var v=a[l+y];w+=v[g-2]+v[g-1]+v[g]+v[g+1]+v[g+2]}var _=w/25;e.thresholdBlock(t,p,h,_,o,s)}}},e.cap=function(t,e,r){return t<e?e:t>r?r:t},e.thresholdBlock=function(t,r,n,o,i,a){for(var s=0,u=n*i+r;s<e.BLOCK_SIZE;s++,u+=i)for(var c=0;c<e.BLOCK_SIZE;c++)(255&t[u+c])<=o&&a.set(r+c,n+s)},e.calculateBlackPoints=function(t,r,n,o,i){for(var a=i-e.BLOCK_SIZE,s=o-e.BLOCK_SIZE,u=new Array(n),c=0;c<n;c++){u[c]=new Int32Array(r);var f=c<<e.BLOCK_SIZE_POWER;f>a&&(f=a);for(var h=0;h<r;h++){var l=h<<e.BLOCK_SIZE_POWER;l>s&&(l=s);for(var d=0,p=255,g=0,w=0,y=f*o+l;w<e.BLOCK_SIZE;w++,y+=o){for(var v=0;v<e.BLOCK_SIZE;v++){var _=255&t[y+v];d+=_,_<p&&(p=_),_>g&&(g=_)}if(g-p>e.MIN_DYNAMIC_RANGE)for(w++,y+=o;w<e.BLOCK_SIZE;w++,y+=o)for(v=0;v<e.BLOCK_SIZE;v++)d+=255&t[y+v]}var m=d>>2*e.BLOCK_SIZE_POWER;if(g-p<=e.MIN_DYNAMIC_RANGE&&(m=p/2,c>0&&h>0)){var C=(u[c-1][h]+2*u[c][h-1]+u[c-1][h-1])/4;p<C&&(m=C)}u[c][h]=m}}return u},e.BLOCK_SIZE_POWER=3,e.BLOCK_SIZE=1<<e.BLOCK_SIZE_POWER,e.BLOCK_SIZE_MASK=e.BLOCK_SIZE-1,e.MINIMUM_DIMENSION=5*e.BLOCK_SIZE,e.MIN_DYNAMIC_RANGE=24,e}(U),W=function(){function t(t,e){this.width=t,this.height=e}return t.prototype.getWidth=function(){return this.width},t.prototype.getHeight=function(){return this.height},t.prototype.isCropSupported=function(){return!1},t.prototype.crop=function(t,e,r,n){throw new P("This luminance source does not support cropping.")},t.prototype.isRotateSupported=function(){return!1},t.prototype.rotateCounterClockwise=function(){throw new P("This luminance source does not support rotation by 90 degrees.")},t.prototype.rotateCounterClockwise45=function(){throw new P("This luminance source does not support rotation by 45 degrees.")},t.prototype.toString=function(){for(var t=new Uint8ClampedArray(this.width),e=new F,r=0;r<this.height;r++){for(var n=this.getRow(r,t),o=0;o<this.width;o++){var i=255&n[o],a=void 0;a=i<64?"#":i<128?"+":i<192?".":" ",e.append(a)}e.append("\n")}return e.toString()},t}(),z=function(){var t=function(e,r){return t=Object.setPrototypeOf||{__proto__:[]}instanceof Array&&function(t,e){t.__proto__=e}||function(t,e){for(var r in e)e.hasOwnProperty(r)&&(t[r]=e[r])},t(e,r)};return function(e,r){function n(){this.constructor=e}t(e,r),e.prototype=null===r?Object.create(r):(n.prototype=r.prototype,new n)}}(),j=function(t){function e(e){var r=t.call(this,e.getWidth(),e.getHeight())||this;return r.delegate=e,r}return z(e,t),e.prototype.getRow=function(t,e){for(var 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null===e?e=this.buffer.slice(n,n+r):(e.length<r&&(e=new Uint8ClampedArray(r)),e.set(this.buffer.slice(n,n+r))),e},e.prototype.getMatrix=function(){return this.buffer},e.prototype.isCropSupported=function(){return!0},e.prototype.crop=function(e,r,n,o){return t.prototype.crop.call(this,e,r,n,o),this},e.prototype.isRotateSupported=function(){return!0},e.prototype.rotateCounterClockwise=function(){return this.rotate(-90),this},e.prototype.rotateCounterClockwise45=function(){return this.rotate(-45),this},e.prototype.getTempCanvasElement=function(){if(null===this.tempCanvasElement){var t=this.canvas.ownerDocument.createElement("canvas");t.width=this.canvas.width,t.height=this.canvas.height,this.tempCanvasElement=t}return this.tempCanvasElement},e.prototype.rotate=function(t){var r=this.getTempCanvasElement(),n=r.getContext("2d"),o=t*e.DEGREE_TO_RADIANS,i=this.canvas.width,a=this.canvas.height,s=Math.ceil(Math.abs(Math.cos(o))*i+Math.abs(Math.sin(o))*a),u=Math.ceil(Math.abs(Math.sin(o))*i+Math.abs(Math.cos(o))*a);return r.width=s,r.height=u,n.translate(s/2,u/2),n.rotate(o),n.drawImage(this.canvas,i/-2,a/-2),this.buffer=e.makeBufferFromCanvasImageData(r),this},e.prototype.invert=function(){return new j(this)},e.DEGREE_TO_RADIANS=Math.PI/180,e.FRAME_INDEX=!0,e}(W),K=function(){function t(t,e,r){this.deviceId=t,this.label=e,this.kind="videoinput",this.groupId=r||void 0}return t.prototype.toJSON=function(){return{kind:this.kind,groupId:this.groupId,deviceId:this.deviceId,label:this.label}},t}(),q=function(t,e,r,n){return new(r||(r=Promise))((function(o,i){function a(t){try{u(n.next(t))}catch(t){i(t)}}function s(t){try{u(n.throw(t))}catch(t){i(t)}}function u(t){var e;t.done?o(t.value):(e=t.value,e instanceof r?e:new 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7:i=a.ops.pop(),a.trys.pop();continue;default:if(!(o=a.trys,(o=o.length>0&&o[o.length-1])||6!==i[0]&&2!==i[0])){a=0;continue}if(3===i[0]&&(!o||i[1]>o[0]&&i[1]<o[3])){a.label=i[1];break}if(6===i[0]&&a.label<o[1]){a.label=o[1],o=i;break}if(o&&a.label<o[2]){a.label=o[2],a.ops.push(i);break}o[2]&&a.ops.pop(),a.trys.pop();continue}i=e.call(t,a)}catch(t){i=[6,t],n=0}finally{r=o=0}if(5&i[0])throw i[1];return{value:i[0]?i[1]:void 0,done:!0}}([i,s])}}},J=function(t){var e="function"==typeof Symbol&&Symbol.iterator,r=e&&t[e],n=0;if(r)return r.call(t);if(t&&"number"==typeof t.length)return{next:function(){return t&&n>=t.length&&(t=void 0),{value:t&&t[n++],done:!t}}};throw new TypeError(e?"Object is not iterable.":"Symbol.iterator is not defined.")},$=function(){function t(t,e,r){void 0===e&&(e=500),this.reader=t,this.timeBetweenScansMillis=e,this._hints=r,this._stopContinuousDecode=!1,this._stopAsyncDecode=!1,this._timeBetweenDecodingAttempts=0}return Object.defineProperty(t.prototype,"hasNavigator",{get:function(){return"undefined"!=typeof navigator},enumerable:!1,configurable:!0}),Object.defineProperty(t.prototype,"isMediaDevicesSuported",{get:function(){return this.hasNavigator&&!!navigator.mediaDevices},enumerable:!1,configurable:!0}),Object.defineProperty(t.prototype,"canEnumerateDevices",{get:function(){return!(!this.isMediaDevicesSuported||!navigator.mediaDevices.enumerateDevices)},enumerable:!1,configurable:!0}),Object.defineProperty(t.prototype,"timeBetweenDecodingAttempts",{get:function(){return this._timeBetweenDecodingAttempts},set:function(t){this._timeBetweenDecodingAttempts=t<0?0:t},enumerable:!1,configurable:!0}),Object.defineProperty(t.prototype,"hints",{get:function(){return this._hints},set:function(t){this._hints=t||null},enumerable:!1,configurable:!0}),t.prototype.listVideoInputDevices=function(){return q(this,void 0,void 0,(function(){var t,e,r,n,o,i,a,s,u,c,f,h;return Q(this,(function(l){switch(l.label){case 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Q(this,(function(r){switch(r.label){case 0:return[4,this.listVideoInputDevices()];case 1:return(e=r.sent())?[2,e.find((function(e){return e.deviceId===t}))]:[2,null]}}))}))},t.prototype.decodeFromInputVideoDevice=function(t,e){return q(this,void 0,void 0,(function(){return Q(this,(function(r){switch(r.label){case 0:return[4,this.decodeOnceFromVideoDevice(t,e)];case 1:return[2,r.sent()]}}))}))},t.prototype.decodeOnceFromVideoDevice=function(t,e){return q(this,void 0,void 0,(function(){var r;return Q(this,(function(n){switch(n.label){case 0:return this.reset(),r={video:t?{deviceId:{exact:t}}:{facingMode:"environment"}},[4,this.decodeOnceFromConstraints(r,e)];case 1:return[2,n.sent()]}}))}))},t.prototype.decodeOnceFromConstraints=function(t,e){return q(this,void 0,void 0,(function(){var r;return Q(this,(function(n){switch(n.label){case 0:return[4,navigator.mediaDevices.getUserMedia(t)];case 1:return r=n.sent(),[4,this.decodeOnceFromStream(r,e)];case 2:return[2,n.sent()]}}))}))},t.prototype.decodeOnceFromStream=function(t,e){return q(this,void 0,void 0,(function(){var r;return Q(this,(function(n){switch(n.label){case 0:return this.reset(),[4,this.attachStreamToVideo(t,e)];case 1:return r=n.sent(),[4,this.decodeOnce(r)];case 2:return[2,n.sent()]}}))}))},t.prototype.decodeFromInputVideoDeviceContinuously=function(t,e,r){return q(this,void 0,void 0,(function(){return Q(this,(function(n){switch(n.label){case 0:return[4,this.decodeFromVideoDevice(t,e,r)];case 1:return[2,n.sent()]}}))}))},t.prototype.decodeFromVideoDevice=function(t,e,r){return q(this,void 0,void 0,(function(){var n;return Q(this,(function(o){switch(o.label){case 0:return n={video:t?{deviceId:{exact:t}}:{facingMode:"environment"}},[4,this.decodeFromConstraints(n,e,r)];case 1:return[2,o.sent()]}}))}))},t.prototype.decodeFromConstraints=function(t,e,r){return q(this,void 0,void 0,(function(){var n;return Q(this,(function(o){switch(o.label){case 0:return[4,navigator.mediaDevices.getUserMedia(t)];case 1:return n=o.sent(),[4,this.decodeFromStream(n,e,r)];case 2:return[2,o.sent()]}}))}))},t.prototype.decodeFromStream=function(t,e,r){return q(this,void 0,void 0,(function(){var n;return Q(this,(function(o){switch(o.label){case 0:return this.reset(),[4,this.attachStreamToVideo(t,e)];case 1:return n=o.sent(),[4,this.decodeContinuously(n,r)];case 2:return[2,o.sent()]}}))}))},t.prototype.stopAsyncDecode=function(){this._stopAsyncDecode=!0},t.prototype.stopContinuousDecode=function(){this._stopContinuousDecode=!0},t.prototype.attachStreamToVideo=function(t,e){return q(this,void 0,void 0,(function(){var r;return Q(this,(function(n){switch(n.label){case 0:return r=this.prepareVideoElement(e),this.addVideoSource(r,t),this.videoElement=r,this.stream=t,[4,this.playVideoOnLoadAsync(r)];case 1:return n.sent(),[2,r]}}))}))},t.prototype.playVideoOnLoadAsync=function(t){var e=this;return new Promise((function(r,n){return e.playVideoOnLoad(t,(function(){return r()}))}))},t.prototype.playVideoOnLoad=function(t,e){var r=this;this.videoEndedListener=function(){return r.stopStreams()},this.videoCanPlayListener=function(){return r.tryPlayVideo(t)},t.addEventListener("ended",this.videoEndedListener),t.addEventListener("canplay",this.videoCanPlayListener),t.addEventListener("playing",e),this.tryPlayVideo(t)},t.prototype.isVideoPlaying=function(t){return t.currentTime>0&&!t.paused&&!t.ended&&t.readyState>2},t.prototype.tryPlayVideo=function(t){return q(this,void 0,void 0,(function(){return Q(this,(function(e){switch(e.label){case 0:if(this.isVideoPlaying(t))return console.warn("Trying to play video that is already playing."),[2];e.label=1;case 1:return e.trys.push([1,3,,4]),[4,t.play()];case 2:return e.sent(),[3,4];case 3:return e.sent(),console.warn("It was not possible to play the video."),[3,4];case 4:return[2]}}))}))},t.prototype.getMediaElement=function(t,e){var r=document.getElementById(t);if(!r)throw new c("element with id '"+t+"' not found");if(r.nodeName.toLowerCase()!==e.toLowerCase())throw new c("element with id '"+t+"' must be an "+e+" element");return r},t.prototype.decodeFromImage=function(t,e){if(!t&&!e)throw new c("either imageElement with a src set or an url must be provided");return e&&!t?this.decodeFromImageUrl(e):this.decodeFromImageElement(t)},t.prototype.decodeFromVideo=function(t,e){if(!t&&!e)throw new c("Either an element with a src set or an URL must be provided");return e&&!t?this.decodeFromVideoUrl(e):this.decodeFromVideoElement(t)},t.prototype.decodeFromVideoContinuously=function(t,e,r){if(void 0===t&&void 0===e)throw new c("Either an element with a src set or an URL must be provided");return e&&!t?this.decodeFromVideoUrlContinuously(e,r):this.decodeFromVideoElementContinuously(t,r)},t.prototype.decodeFromImageElement=function(t){if(!t)throw new c("An image element must be provided.");this.reset();var e=this.prepareImageElement(t);return this.imageElement=e,this.isImageLoaded(e)?this.decodeOnce(e,!1,!0):this._decodeOnLoadImage(e)},t.prototype.decodeFromVideoElement=function(t){var e=this._decodeFromVideoElementSetup(t);return this._decodeOnLoadVideo(e)},t.prototype.decodeFromVideoElementContinuously=function(t,e){var r=this._decodeFromVideoElementSetup(t);return this._decodeOnLoadVideoContinuously(r,e)},t.prototype._decodeFromVideoElementSetup=function(t){if(!t)throw new c("A video element must be provided.");this.reset();var e=this.prepareVideoElement(t);return this.videoElement=e,e},t.prototype.decodeFromImageUrl=function(t){if(!t)throw new c("An URL must be provided.");this.reset();var e=this.prepareImageElement();this.imageElement=e;var r=this._decodeOnLoadImage(e);return e.src=t,r},t.prototype.decodeFromVideoUrl=function(t){if(!t)throw new c("An URL must be provided.");this.reset();var e=this.prepareVideoElement(),r=this.decodeFromVideoElement(e);return e.src=t,r},t.prototype.decodeFromVideoUrlContinuously=function(t,e){if(!t)throw new c("An URL must be provided.");this.reset();var r=this.prepareVideoElement(),n=this.decodeFromVideoElementContinuously(r,e);return r.src=t,n},t.prototype._decodeOnLoadImage=function(t){var e=this;return new Promise((function(r,n){e.imageLoadedListener=function(){return e.decodeOnce(t,!1,!0).then(r,n)},t.addEventListener("load",e.imageLoadedListener)}))},t.prototype._decodeOnLoadVideo=function(t){return q(this,void 0,void 0,(function(){return Q(this,(function(e){switch(e.label){case 0:return[4,this.playVideoOnLoadAsync(t)];case 1:return e.sent(),[4,this.decodeOnce(t)];case 2:return[2,e.sent()]}}))}))},t.prototype._decodeOnLoadVideoContinuously=function(t,e){return q(this,void 0,void 0,(function(){return Q(this,(function(r){switch(r.label){case 0:return[4,this.playVideoOnLoadAsync(t)];case 1:return r.sent(),this.decodeContinuously(t,e),[2]}}))}))},t.prototype.isImageLoaded=function(t){return!!t.complete&&0!==t.naturalWidth},t.prototype.prepareImageElement=function(t){var e;return void 0===t&&((e=document.createElement("img")).width=200,e.height=200),"string"==typeof t&&(e=this.getMediaElement(t,"img")),t instanceof HTMLImageElement&&(e=t),e},t.prototype.prepareVideoElement=function(t){var e;return t||"undefined"==typeof document||((e=document.createElement("video")).width=200,e.height=200),"string"==typeof t&&(e=this.getMediaElement(t,"video")),t instanceof HTMLVideoElement&&(e=t),e.setAttribute("autoplay","true"),e.setAttribute("muted","true"),e.setAttribute("playsinline","true"),e},t.prototype.decodeOnce=function(t,e,r){var n=this;void 0===e&&(e=!0),void 0===r&&(r=!0),this._stopAsyncDecode=!1;var o=function(i,a){if(n._stopAsyncDecode)return a(new V("Video stream has ended before any code could be detected.")),void(n._stopAsyncDecode=void 0);try{i(n.decode(t))}catch(t){if(e&&t instanceof V||(t instanceof p||t instanceof b)&&r)return setTimeout(o,n._timeBetweenDecodingAttempts,i,a);a(t)}};return new Promise((function(t,e){return o(t,e)}))},t.prototype.decodeContinuously=function(t,e){var r=this;this._stopContinuousDecode=!1;var n=function(){if(r._stopContinuousDecode)r._stopContinuousDecode=void 0;else try{var o=r.decode(t);e(o,null),setTimeout(n,r.timeBetweenScansMillis)}catch(t){e(null,t),(t instanceof p||t instanceof b||t instanceof V)&&setTimeout(n,r._timeBetweenDecodingAttempts)}};n()},t.prototype.decode=function(t){var e=this.createBinaryBitmap(t);return this.decodeBitmap(e)},t.prototype.createBinaryBitmap=function(t){this.getCaptureCanvasContext(t),t instanceof HTMLVideoElement?this.drawFrameOnCanvas(t):this.drawImageOnCanvas(t);var e=this.getCaptureCanvas(t),r=new Z(e),n=new X(r);return new l(n)},t.prototype.getCaptureCanvasContext=function(t){if(!this.captureCanvasContext){var e=this.getCaptureCanvas(t),r=void 0;try{r=e.getContext("2d",{willReadFrequently:!0})}catch(t){r=e.getContext("2d")}this.captureCanvasContext=r}return this.captureCanvasContext},t.prototype.getCaptureCanvas=function(t){if(!this.captureCanvas){var e=this.createCaptureCanvas(t);this.captureCanvas=e}return this.captureCanvas},t.prototype.drawFrameOnCanvas=function(t,e,r){void 0===e&&(e={sx:0,sy:0,sWidth:t.videoWidth,sHeight:t.videoHeight,dx:0,dy:0,dWidth:t.videoWidth,dHeight:t.videoHeight}),void 0===r&&(r=this.captureCanvasContext),r.drawImage(t,e.sx,e.sy,e.sWidth,e.sHeight,e.dx,e.dy,e.dWidth,e.dHeight)},t.prototype.drawImageOnCanvas=function(t,e,r){void 0===e&&(e={sx:0,sy:0,sWidth:t.naturalWidth,sHeight:t.naturalHeight,dx:0,dy:0,dWidth:t.naturalWidth,dHeight:t.naturalHeight}),void 0===r&&(r=this.captureCanvasContext),r.drawImage(t,e.sx,e.sy,e.sWidth,e.sHeight,e.dx,e.dy,e.dWidth,e.dHeight)},t.prototype.decodeBitmap=function(t){return this.reader.decode(t,this._hints)},t.prototype.createCaptureCanvas=function(t){if("undefined"==typeof document)return this._destroyCaptureCanvas(),null;var e,r,n=document.createElement("canvas");return void 0!==t&&(t instanceof HTMLVideoElement?(e=t.videoW