gif.js from https://github.com/jnordberg/gif.js
Este script no debería instalarse directamente. Es una biblioteca que utilizan otros scripts mediante la meta-directiva de inclusión // @require https://update.greasyfork.org/scripts/2963/8596/gifjs.js
// ==UserScript==
// @name gif.js
// @namespace http://mfish.twbbs.org/
// @version 0.1.6
// @grant none
// ==/UserScript==
/**
*
* I didn't create this, just modified it to allow it running in userscript.
* Auther : https://github.com/jnordberg/gif.js
*
*/
var GIF_worker_URL = (function () {
var workerScript = "(function(b){function a(b,d){if({}.hasOwnProperty.call(a.cache,b))return a.cache[b];var e=a.resolve(b);if(!e)throw new Error('Failed to resolve module '+b);var c={id:b,require:a,filename:b,exports:{},loaded:!1,parent:d,children:[]};d&&d.children.push(c);var f=b.slice(0,b.lastIndexOf('/')+1);return a.cache[b]=c.exports,e.call(c.exports,c,c.exports,f,b),c.loaded=!0,a.cache[b]=c.exports}a.modules={},a.cache={},a.resolve=function(b){return{}.hasOwnProperty.call(a.modules,b)?a.modules[b]:void 0},a.define=function(b,c){a.modules[b]=c},a.define('/gif.worker.coffee',function(d,e,f,g){var b,c;b=a('/GIFEncoder.js',d),c=function(a){var c,e,d,f;return c=new b(a.width,a.height),a.index===0?c.writeHeader():c.firstFrame=!1,c.setTransparent(a.transparent),c.setRepeat(a.repeat),c.setDelay(a.delay),c.setQuality(a.quality),c.addFrame(a.data),a.last&&c.finish(),d=c.stream(),a.data=d.pages,a.cursor=d.cursor,a.pageSize=d.constructor.pageSize,a.canTransfer?(f=function(c){for(var b=0,d=a.data.length;b<d;++b)e=a.data[b],c.push(e.buffer);return c}.call(this,[]),self.postMessage(a,f)):self.postMessage(a)},self.onmessage=function(a){return c(a.data)}}),a.define('/GIFEncoder.js',function(e,h,i,j){function c(){this.page=-1,this.pages=[],this.newPage()}function b(a,b){this.width=~~a,this.height=~~b,this.transparent=null,this.transIndex=0,this.repeat=-1,this.delay=0,this.image=null,this.pixels=null,this.indexedPixels=null,this.colorDepth=null,this.colorTab=null,this.usedEntry=new Array,this.palSize=7,this.dispose=-1,this.firstFrame=!0,this.sample=10,this.out=new c}var f=a('/TypedNeuQuant.js',e),g=a('/LZWEncoder.js',e);c.pageSize=4096,c.charMap={};for(var d=0;d<256;d++)c.charMap[d]=String.fromCharCode(d);c.prototype.newPage=function(){this.pages[++this.page]=new Uint8Array(c.pageSize),this.cursor=0},c.prototype.getData=function(){var d='';for(var a=0;a<this.pages.length;a++)for(var b=0;b<c.pageSize;b++)d+=c.charMap[this.pages[a][b]];return 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c=e||b.length,a=d||0;a<c;a++)this.writeByte(b[a])},b.prototype.setDelay=function(a){this.delay=Math.round(a/10)},b.prototype.setFrameRate=function(a){this.delay=Math.round(100/a)},b.prototype.setDispose=function(a){a>=0&&(this.dispose=a)},b.prototype.setRepeat=function(a){this.repeat=a},b.prototype.setTransparent=function(a){this.transparent=a},b.prototype.addFrame=function(a){this.image=a,this.getImagePixels(),this.analyzePixels(),this.firstFrame&&(this.writeLSD(),this.writePalette(),this.repeat>=0&&this.writeNetscapeExt()),this.writeGraphicCtrlExt(),this.writeImageDesc(),this.firstFrame||this.writePalette(),this.writePixels(),this.firstFrame=!1},b.prototype.finish=function(){this.out.writeByte(59)},b.prototype.setQuality=function(a){a<1&&(a=1),this.sample=a},b.prototype.writeHeader=function(){this.out.writeUTFBytes('GIF89a')},b.prototype.analyzePixels=function(){var g=this.pixels.length,d=g/3;this.indexedPixels=new Uint8Array(d);var a=new f(this.pixels,this.sample);a.buildColormap(),this.colorTab=a.getColormap();var b=0;for(var c=0;c<d;c++){var e=a.lookupRGB(this.pixels[b++]&255,this.pixels[b++]&255,this.pixels[b++]&255);this.usedEntry[e]=!0,this.indexedPixels[c]=e}this.pixels=null,this.colorDepth=8,this.palSize=7,this.transparent!==null&&(this.transIndex=this.findClosest(this.transparent))},b.prototype.findClosest=function(e){if(this.colorTab===null)return-1;var k=(e&16711680)>>16,l=(e&65280)>>8,m=e&255,c=0,d=16777216,j=this.colorTab.length;for(var a=0;a<j;){var f=k-(this.colorTab[a++]&255),g=l-(this.colorTab[a++]&255),h=m-(this.colorTab[a]&255),i=f*f+g*g+h*h,b=parseInt(a/3);this.usedEntry[b]&&i<d&&(d=i,c=b),a++}return c},b.prototype.getImagePixels=function(){var a=this.width,g=this.height;this.pixels=new Uint8Array(a*g*3);var b=this.image,c=0;for(var d=0;d<g;d++)for(var e=0;e<a;e++){var 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b,a;this.transparent===null?(b=0,a=0):(b=1,a=2),this.dispose>=0&&(a=dispose&7),a<<=2,this.out.writeByte(0|a|0|b),this.writeShort(this.delay),this.out.writeByte(this.transIndex),this.out.writeByte(0)},b.prototype.writeImageDesc=function(){this.out.writeByte(44),this.writeShort(0),this.writeShort(0),this.writeShort(this.width),this.writeShort(this.height),this.firstFrame?this.out.writeByte(0):this.out.writeByte(128|this.palSize)},b.prototype.writeLSD=function(){this.writeShort(this.width),this.writeShort(this.height),this.out.writeByte(240|this.palSize),this.out.writeByte(0),this.out.writeByte(0)},b.prototype.writeNetscapeExt=function(){this.out.writeByte(33),this.out.writeByte(255),this.out.writeByte(11),this.out.writeUTFBytes('NETSCAPE2.0'),this.out.writeByte(3),this.out.writeByte(1),this.writeShort(this.repeat),this.out.writeByte(0)},b.prototype.writePalette=function(){this.out.writeBytes(this.colorTab);var b=768-this.colorTab.length;for(var 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o,q,t,y,z;this.buildColormap=G,this.getColormap=H,this.lookupRGB=E}var w=100,a=256,n=a-1,b=4,i=16,e=1<<i,f=10,B=1<<f,g=10,x=e>>g,r=e<<f-g,z=a>>3,h=6,t=1<<h,u=z*t,v=30,o=10,d=1<<o,q=8,m=1<<q,y=o+q,c=1<<y,l=499,k=491,p=487,j=503,s=3*j;A.exports=C}),a('/gif.worker.coffee')}.call(this,this))";
function getUrl (blob) {
return URL.createObjectURL(blob);
}
function createBlob (text, MIME) {
var aFileParts = [text];
var oMyBlob = new Blob(aFileParts, {type : MIME});
return oMyBlob;
}
var workerURL = getUrl(createBlob(workerScript, 'application/x-javascript'));
return workerURL;
}());
(function(c){function a(b,d){if({}.hasOwnProperty.call(a.cache,b))return a.cache[b];var e=a.resolve(b);if(!e)throw new Error('Failed to resolve module '+b);var c={id:b,require:a,filename:b,exports:{},loaded:!1,parent:d,children:[]};d&&d.children.push(c);var f=b.slice(0,b.lastIndexOf('/')+1);return a.cache[b]=c.exports,e.call(c.exports,c,c.exports,f,b),c.loaded=!0,a.cache[b]=c.exports}a.modules={},a.cache={},a.resolve=function(b){return{}.hasOwnProperty.call(a.modules,b)?a.modules[b]:void 0},a.define=function(b,c){a.modules[b]=c};var b=function(a){return a='/',{title:'browser',version:'v0.10.26',browser:!0,env:{},argv:[],nextTick:c.setImmediate||function(a){setTimeout(a,0)},cwd:function(){return a},chdir:function(b){a=b}}}();a.define('/gif.coffee',function(d,m,l,k){function g(a,b){return{}.hasOwnProperty.call(a,b)}function j(d,b){for(var a=0,c=b.length;a<c;++a)if(a in b&&b[a]===d)return!0;return!1}function i(a,b){function d(){this.constructor=a}for(var c in b)g(b,c)&&(a[c]=b[c]);return d.prototype=b.prototype,a.prototype=new d,a.__super__=b.prototype,a}var h,c,f,b,e;f=a('events',d).EventEmitter,h=a('/browser.coffee',d),e=function(d){function a(d){var a,b;this.running=!1,this.options={},this.frames=[],this.freeWorkers=[],this.activeWorkers=[],this.setOptions(d);for(a in c)b=c[a],null!=this.options[a]?this.options[a]:this.options[a]=b}return i(a,d),c={workerScript:'gif.worker.js',workers:2,repeat:0,background:'#fff',quality:10,width:null,height:null,transparent:null},b={delay:500,copy:!1},a.prototype.setOption=function(a,b){return this.options[a]=b,null!=this._canvas&&(a==='width'||a==='height')?this._canvas[a]=b:void 0},a.prototype.setOptions=function(b){var a,c;return function(d){for(a in b){if(!g(b,a))continue;c=b[a],d.push(this.setOption(a,c))}return d}.call(this,[])},a.prototype.addFrame=function(a,d){var c,e;null==d&&(d={}),c={},c.transparent=this.options.transparent;for(e in b)c[e]=d[e]||b[e];if(null!=this.options.width||this.setOption('width',a.width),null!=this.options.height||this.setOption('height',a.height),'undefined'!==typeof ImageData&&null!=ImageData&&a instanceof ImageData)c.data=a.data;else if('undefined'!==typeof CanvasRenderingContext2D&&null!=CanvasRenderingContext2D&&a instanceof CanvasRenderingContext2D||'undefined'!==typeof WebGLRenderingContext&&null!=WebGLRenderingContext&&a instanceof WebGLRenderingContext)d.copy?c.data=this.getContextData(a):c.context=a;else if(null!=a.childNodes)d.copy?c.data=this.getImageData(a):c.image=a;else throw new Error('Invalid image');return this.frames.push(c)},a.prototype.render=function(){var d,a;if(this.running)throw new Error('Already running');if(!(null!=this.options.width&&null!=this.options.height))throw new Error('Width and height must be set prior to rendering');this.running=!0,this.nextFrame=0,this.finishedFrames=0,this.imageParts=function(c){for(var b=function(){var b;b=[];for(var a=0;0<=this.frames.length?a<this.frames.length:a>this.frames.length;0<=this.frames.length?++a:--a)b.push(a);return b}.apply(this,arguments),a=0,e=b.length;a<e;++a)d=b[a],c.push(null);return c}.call(this,[]),a=this.spawnWorkers();for(var c=function(){var c;c=[];for(var b=0;0<=a?b<a:b>a;0<=a?++b:--b)c.push(b);return c}.apply(this,arguments),b=0,e=c.length;b<e;++b)d=c[b],this.renderNextFrame();return this.emit('start'),this.emit('progress',0)},a.prototype.abort=function(){var a;while(!0){if(a=this.activeWorkers.shift(),!(null!=a))break;console.log('killing active worker'),a.terminate()}return this.running=!1,this.emit('abort')},a.prototype.spawnWorkers=function(){var a;return a=Math.min(this.options.workers,this.frames.length),function(){var c;c=[];for(var b=this.freeWorkers.length;this.freeWorkers.length<=a?b<a:b>a;this.freeWorkers.length<=a?++b:--b)c.push(b);return c}.apply(this,arguments).forEach(function(a){return function(c){var b;return console.log('spawning worker '+c),b=new Worker(a.options.workerScript),b.onmessage=function(a){return function(c){return a.activeWorkers.splice(a.activeWorkers.indexOf(b),1),a.freeWorkers.push(b),a.frameFinished(c.data)}}(a),a.freeWorkers.push(b)}}(this)),a},a.prototype.frameFinished=function(a){return console.log('frame '+a.index+' finished - '+this.activeWorkers.length+' active'),this.finishedFrames++,this.emit('progress',this.finishedFrames/this.frames.length),this.imageParts[a.index]=a,j(null,this.imageParts)?this.renderNextFrame():this.finishRendering()},a.prototype.finishRendering=function(){var e,a,k,m,b,d,h;b=0;for(var f=0,j=this.imageParts.length;f<j;++f)a=this.imageParts[f],b+=(a.data.length-1)*a.pageSize+a.cursor;b+=a.pageSize-a.cursor,console.log('rendering finished - filesize '+Math.round(b/1e3)+'kb'),e=new Uint8Array(b),d=0;for(var g=0,l=this.imageParts.length;g<l;++g){a=this.imageParts[g];for(var c=0,i=a.data.length;c<i;++c)h=a.data[c],k=c,e.set(h,d),k===a.data.length-1?d+=a.cursor:d+=a.pageSize}return m=new Blob([e],{type:'image/gif'}),this.emit('finished',m,e)},a.prototype.renderNextFrame=function(){var c,a,b;if(this.freeWorkers.length===0)throw new Error('No free workers');return this.nextFrame>=this.frames.length?void 0:(c=this.frames[this.nextFrame++],b=this.freeWorkers.shift(),a=this.getTask(c),console.log('starting frame '+(a.index+1)+' of '+this.frames.length),this.activeWorkers.push(b),b.postMessage(a))},a.prototype.getContextData=function(a){return a.getImageData(0,0,this.options.width,this.options.height).data},a.prototype.getImageData=function(b){var a;return null!=this._canvas||(this._canvas=document.createElement('canvas'),this._canvas.width=this.options.width,this._canvas.height=this.options.height),a=this._canvas.getContext('2d'),a.setFill=this.options.background,a.fillRect(0,0,this.options.width,this.options.height),a.drawImage(b,0,0),this.getContextData(a)},a.prototype.getTask=function(a){var c,b;if(c=this.frames.indexOf(a),b={index:c,last:c===this.frames.length-1,delay:a.delay,transparent:a.transparent,width:this.options.width,height:this.options.height,quality:this.options.quality,repeat:this.options.repeat,canTransfer:h.name==='chrome'},null!=a.data)b.data=a.data;else if(null!=a.context)b.data=this.getContextData(a.context);else if(null!=a.image)b.data=this.getImageData(a.image);else throw new Error('Invalid frame');return b},a}(f),d.exports=e}),a.define('/browser.coffee',function(f,g,h,i){var a,d,e,c,b;c=navigator.userAgent.toLowerCase(),e=navigator.platform.toLowerCase(),b=c.match(/(opera|ie|firefox|chrome|version)[\s\/:]([\w\d\.]+)?.*?(safari|version[\s\/:]([\w\d\.]+)|$)/)||[null,'unknown',0],d=b[1]==='ie'&&document.documentMode,a={name:b[1]==='version'?b[3]:b[1],version:d||parseFloat(b[1]==='opera'&&b[4]?b[4]:b[2]),platform:{name:c.match(/ip(?:ad|od|hone)/)?'ios':(c.match(/(?:webos|android)/)||e.match(/mac|win|linux/)||['other'])[0]}},a[a.name]=!0,a[a.name+parseInt(a.version,10)]=!0,a.platform[a.platform.name]=!0,f.exports=a}),a.define('events',function(f,e,g,h){b.EventEmitter||(b.EventEmitter=function(){});var a=e.EventEmitter=b.EventEmitter,c=typeof Array.isArray==='function'?Array.isArray:function(a){return Object.prototype.toString.call(a)==='[object Array]'},d=10;a.prototype.setMaxListeners=function(a){this._events||(this._events={}),this._events.maxListeners=a},a.prototype.emit=function(f){if(f==='error'&&(!(this._events&&this._events.error)||c(this._events.error)&&!this._events.error.length))throw arguments[1]instanceof Error?arguments[1]:new Error("Uncaught, unspecified 'error' event.");if(!this._events)return!1;var a=this._events[f];if(!a)return!1;if(!(typeof a=='function'))if(c(a)){var b=Array.prototype.slice.call(arguments,1),e=a.slice();for(var d=0,g=e.length;d<g;d++)e[d].apply(this,b);return!0}else return!1;switch(arguments.length){case 1:a.call(this);break;case 2:a.call(this,arguments[1]);break;case 3:a.call(this,arguments[1],arguments[2]);break;default:var b=Array.prototype.slice.call(arguments,1);a.apply(this,b)}return!0},a.prototype.addListener=function(a,b){if('function'!==typeof b)throw new Error('addListener only takes instances of Function');if(this._events||(this._events={}),this.emit('newListener',a,b),!this._events[a])this._events[a]=b;else if(c(this._events[a])){if(!this._events[a].warned){var e;this._events.maxListeners!==undefined?e=this._events.maxListeners:e=d,e&&e>0&&this._events[a].length>e&&(this._events[a].warned=!0,console.error('(node) warning: possible EventEmitter memory leak detected. %d listeners added. Use emitter.setMaxListeners() to increase limit.',this._events[a].length),console.trace())}this._events[a].push(b)}else this._events[a]=[this._events[a],b];return this},a.prototype.on=a.prototype.addListener,a.prototype.once=function(b,c){var a=this;return a.on(b,function d(){a.removeListener(b,d),c.apply(this,arguments)}),this},a.prototype.removeListener=function(a,d){if('function'!==typeof d)throw new Error('removeListener only takes instances of Function');if(!(this._events&&this._events[a]))return this;var b=this._events[a];if(c(b)){var e=b.indexOf(d);if(e<0)return this;b.splice(e,1),b.length==0&&delete this._events[a]}else this._events[a]===d&&delete this._events[a];return this},a.prototype.removeAllListeners=function(a){return a&&this._events&&this._events[a]&&(this._events[a]=null),this},a.prototype.listeners=function(a){return this._events||(this._events={}),this._events[a]||(this._events[a]=[]),c(this._events[a])||(this._events[a]=[this._events[a]]),this._events[a]}}),c.GIF=a('/gif.coffee')}.call(this,this))
//# sourceMappingURL=gif.js.map
// gif.js 0.1.6 - https://github.com/jnordberg/gif.js
/**
* source and source map from
* https://github.com/jnordberg/gif.js/tree/master/dist
*/