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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"]} |