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= require 'events'\nbrowser = require './browser.coffee'\n\nclass GIF extends EventEmitter\n\n  defaults =\n    workerScript: 'gif.worker.js'\n    workers: 2\n    repeat: 0 # repeat forever, -1 = repeat once\n    background: '#fff'\n    quality: 10 # pixel sample interval, lower is better\n    width: null # size derermined from first frame if possible\n    height: null\n    transparent: null\n\n  frameDefaults =\n    delay: 500 # ms\n    copy: false\n\n  constructor: (options) ->\n    @running = false\n\n    @options = {}\n    @frames = []\n\n    @freeWorkers = []\n    @activeWorkers = []\n\n    @setOptions options\n    for key, value of defaults\n      @options[key] ?= value\n\n  setOption: (key, value) ->\n    @options[key] = value\n    if @_canvas? and key in ['width', 'height']\n      @_canvas[key] = value\n\n  setOptions: (options) ->\n    @setOption key, value for own key, value of options\n\n  addFrame: (image, options={}) ->\n    frame = {}\n    frame.transparent = @options.transparent\n    for key of frameDefaults\n      frame[key] = options[key] or frameDefaults[key]\n\n    # use the images width and height for options unless already set\n    @setOption 'width', image.width unless @options.width?\n    @setOption 'height', image.height unless @options.height?\n\n    if ImageData? and image instanceof ImageData\n       frame.data = image.data\n    else if (CanvasRenderingContext2D? and image instanceof CanvasRenderingContext2D) or (WebGLRenderingContext? and image instanceof WebGLRenderingContext)\n      if options.copy\n        frame.data = @getContextData image\n      else\n        frame.context = image\n    else if image.childNodes?\n      if options.copy\n        frame.data = @getImageData image\n      else\n        frame.image = image\n    else\n      throw new Error 'Invalid image'\n\n    @frames.push frame\n\n  render: ->\n    throw new Error 'Already running' if @running\n\n    if not @options.width? or not @options.height?\n      throw new Error 'Width and height must be set prior to rendering'\n\n    @running = true\n    @nextFrame = 0\n    @finishedFrames = 0\n\n    @imageParts = (null for i in [0...@frames.length])\n    numWorkers = @spawnWorkers()\n    @renderNextFrame() for i in [0...numWorkers]\n\n    @emit 'start'\n    @emit 'progress', 0\n\n  abort: ->\n    loop\n      worker = @activeWorkers.shift()\n      break unless worker?\n      console.log \"killing active worker\"\n      worker.terminate()\n    @running = false\n    @emit 'abort'\n\n  # private\n\n  spawnWorkers: ->\n    numWorkers = Math.min(@options.workers, @frames.length)\n    [@freeWorkers.length...numWorkers].forEach (i) =>\n      console.log \"spawning worker #{ i }\"\n      worker = new Worker @options.workerScript\n      worker.onmessage = (event) =>\n        @activeWorkers.splice @activeWorkers.indexOf(worker), 1\n        @freeWorkers.push worker\n        @frameFinished event.data\n      @freeWorkers.push worker\n    return numWorkers\n\n  frameFinished: (frame) ->\n    console.log \"frame #{ frame.index } finished - #{ @activeWorkers.length } active\"\n    @finishedFrames++\n    @emit 'progress', @finishedFrames / @frames.length\n    @imageParts[frame.index] = frame\n    if null in @imageParts\n      @renderNextFrame()\n    else\n      @finishRendering()\n\n  finishRendering: ->\n    len = 0\n    for frame in @imageParts\n      len += (frame.data.length - 1) * frame.pageSize + frame.cursor\n    len += frame.pageSize - frame.cursor\n    console.log \"rendering finished - filesize #{ Math.round(len / 1000) }kb\"\n    data = new Uint8Array len\n    offset = 0\n    for frame in @imageParts\n      for page, i in frame.data\n        data.set page, offset\n        if i is frame.data.length - 1\n          offset += frame.cursor\n        else\n          offset += frame.pageSize\n\n    image = new Blob [data],\n      type: 'image/gif'\n\n    @emit 'finished', image, data\n\n  renderNextFrame: ->\n    throw new Error 'No free workers' if @freeWorkers.length is 0\n    return if @nextFrame >= @frames.length # no new frame to render\n\n    frame = @frames[@nextFrame++]\n    worker = @freeWorkers.shift()\n    task = @getTask frame\n\n    console.log \"starting frame #{ task.index + 1 } of #{ @frames.length }\"\n    @activeWorkers.push worker\n    worker.postMessage task#, [task.data.buffer]\n\n  getContextData: (ctx) ->\n    return ctx.getImageData(0, 0, @options.width, @options.height).data\n\n  getImageData: (image) ->\n    if not @_canvas?\n      @_canvas = document.createElement 'canvas'\n      @_canvas.width = @options.width\n      @_canvas.height = @options.height\n\n    ctx = @_canvas.getContext '2d'\n    ctx.setFill = @options.background\n    ctx.fillRect 0, 0, @options.width, @options.height\n    ctx.drawImage image, 0, 0\n\n    return @getContextData ctx\n\n  getTask: (frame) ->\n    index = @frames.indexOf frame\n    task =\n      index: index\n      last: index is (@frames.length - 1)\n      delay: frame.delay\n      transparent: frame.transparent\n      width: @options.width\n      height: @options.height\n      quality: @options.quality\n      repeat: @options.repeat\n      canTransfer: (browser.name is 'chrome')\n\n    if frame.data?\n      task.data = frame.data\n    else if frame.context?\n      task.data = @getContextData frame.context\n    else if frame.image?\n      task.data = @getImageData frame.image\n    else\n      throw new Error 'Invalid frame'\n\n    return task\n\nmodule.exports = GIF\n","### CoffeeScript version of the browser detection from MooTools ###\n\nua = navigator.userAgent.toLowerCase()\nplatform = navigator.platform.toLowerCase()\nUA = ua.match(/(opera|ie|firefox|chrome|version)[\\s\\/:]([\\w\\d\\.]+)?.*?(safari|version[\\s\\/:]([\\w\\d\\.]+)|$)/) or [null, 'unknown', 0]\nmode = UA[1] == 'ie' && document.documentMode\n\nbrowser =\n  name: if UA[1] is 'version' then UA[3] else UA[1]\n  version: mode or parseFloat(if UA[1] is 'opera' && UA[4] then UA[4] else UA[2])\n\n  platform:\n    name: if ua.match(/ip(?:ad|od|hone)/) then 'ios' else (ua.match(/(?:webos|android)/) or platform.match(/mac|win|linux/) or ['other'])[0]\n\nbrowser[browser.name] = true\nbrowser[browser.name + parseInt(browser.version, 10)] = true\nbrowser.platform[browser.platform.name] = true\n\nmodule.exports = browser\n","if (!process.EventEmitter) process.EventEmitter = function () {};\n\nvar EventEmitter = exports.EventEmitter = process.EventEmitter;\nvar isArray = typeof Array.isArray === 'function'\n    ? Array.isArray\n    : function (xs) {\n        return Object.prototype.toString.call(xs) === '[object Array]'\n    }\n;\n\n// By default EventEmitters will print a warning if more than\n// 10 listeners are added to it. This is a useful default which\n// helps finding memory leaks.\n//\n// Obviously not all Emitters should be limited to 10. This function allows\n// that to be increased. Set to zero for unlimited.\nvar defaultMaxListeners = 10;\nEventEmitter.prototype.setMaxListeners = function(n) {\n  if (!this._events) this._events = {};\n  this._events.maxListeners = n;\n};\n\n\nEventEmitter.prototype.emit = function(type) {\n  // If there is no 'error' event listener then throw.\n  if (type === 'error') {\n    if (!this._events || !this._events.error ||\n        (isArray(this._events.error) && !this._events.error.length))\n    {\n      if (arguments[1] instanceof Error) {\n        throw arguments[1]; // Unhandled 'error' event\n      } else {\n        throw new Error(\"Uncaught, unspecified 'error' event.\");\n      }\n      return false;\n    }\n  }\n\n  if (!this._events) return false;\n  var handler = this._events[type];\n  if (!handler) return false;\n\n  if (typeof handler == 'function') {\n    switch (arguments.length) {\n      // fast cases\n      case 1:\n        handler.call(this);\n        break;\n      case 2:\n        handler.call(this, arguments[1]);\n        break;\n      case 3:\n        handler.call(this, arguments[1], arguments[2]);\n        break;\n      // slower\n      default:\n        var args = Array.prototype.slice.call(arguments, 1);\n        handler.apply(this, args);\n    }\n    return true;\n\n  } else if (isArray(handler)) {\n    var args = Array.prototype.slice.call(arguments, 1);\n\n    var listeners = handler.slice();\n    for (var i = 0, l = listeners.length; i < l; i++) {\n      listeners[i].apply(this, args);\n    }\n    return true;\n\n  } else {\n    return false;\n  }\n};\n\n// EventEmitter is defined in src/node_events.cc\n// EventEmitter.prototype.emit() is also defined there.\nEventEmitter.prototype.addListener = function(type, listener) {\n  if ('function' !== typeof listener) {\n    throw new Error('addListener only takes instances of Function');\n  }\n\n  if (!this._events) this._events = {};\n\n  // To avoid recursion in the case that type == \"newListeners\"! Before\n  // adding it to the listeners, first emit \"newListeners\".\n  this.emit('newListener', type, listener);\n\n  if (!this._events[type]) {\n    // Optimize the case of one listener. Don't need the extra array object.\n    this._events[type] = listener;\n  } else if (isArray(this._events[type])) {\n\n    // Check for listener leak\n    if (!this._events[type].warned) {\n      var m;\n      if (this._events.maxListeners !== undefined) {\n        m = this._events.maxListeners;\n      } else {\n        m = defaultMaxListeners;\n      }\n\n      if (m && m > 0 && this._events[type].length > m) {\n        this._events[type].warned = true;\n        console.error('(node) warning: possible EventEmitter memory ' +\n                      'leak detected. %d listeners added. ' +\n                      'Use emitter.setMaxListeners() to increase limit.',\n                      this._events[type].length);\n        console.trace();\n      }\n    }\n\n    // If we've already got an array, just append.\n    this._events[type].push(listener);\n  } else {\n    // Adding the second element, need to change to array.\n    this._events[type] = [this._events[type], listener];\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.on = EventEmitter.prototype.addListener;\n\nEventEmitter.prototype.once = function(type, listener) {\n  var self = this;\n  self.on(type, function g() {\n    self.removeListener(type, g);\n    listener.apply(this, arguments);\n  });\n\n  return this;\n};\n\nEventEmitter.prototype.removeListener = function(type, listener) {\n  if ('function' !== typeof listener) {\n    throw new Error('removeListener only takes instances of Function');\n  }\n\n  // does not use listeners(), so no side effect of creating _events[type]\n  if (!this._events || !this._events[type]) return this;\n\n  var list = this._events[type];\n\n  if (isArray(list)) {\n    var i = list.indexOf(listener);\n    if (i < 0) return this;\n    list.splice(i, 1);\n    if (list.length == 0)\n      delete this._events[type];\n  } else if (this._events[type] === listener) {\n    delete this._events[type];\n  }\n\n  return this;\n};\n\nEventEmitter.prototype.removeAllListeners = function(type) {\n  // does not use listeners(), so no side effect of creating _events[type]\n  if (type && this._events && this._events[type]) this._events[type] = null;\n  return this;\n};\n\nEventEmitter.prototype.listeners = function(type) {\n  if (!this._events) this._events = {};\n  if (!this._events[type]) this._events[type] = [];\n  if (!isArray(this._events[type])) {\n    this._events[type] = [this._events[type]];\n  }\n  return this._events[type];\n};\n"]}