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<!DOCTYPE html>
<html>
<head>
<title>caman.coffee</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
<link rel="stylesheet" media="all" href="docco.css" />
</head>
<body>
<div id="container">
<div id="background"></div>
<ul id="jump_to">
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<a class="large" href="javascript:void(0);">Jump To …</a>
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analyze.coffee
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autoload.coffee
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blender.coffee
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calculate.coffee
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caman.coffee
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convert.coffee
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event.coffee
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filter.coffee
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io.coffee
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layer.coffee
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logger.coffee
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module.coffee
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pixel.coffee
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plugin.coffee
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renderer.coffee
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store.coffee
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util.coffee
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blenders.coffee
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filters.coffee
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size.coffee
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blur.coffee
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camera.coffee
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compoundBlur.coffee
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edges.coffee
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posterize.coffee
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presets.coffee
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rotate.coffee
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stackBlur.coffee
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threshold.coffee
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</div>
</li>
</ul>
<ul class="sections">
<li id="title">
<div class="annotation">
<h1>caman.coffee</h1>
</div>
</li>
<li id="section-1">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-1">¶</a>
</div>
<p>NodeJS compatibility</p>
</div>
<div class="content"><div class='highlight'><pre><span class="keyword">if</span> exports?
Root = exports
Canvas = require <span class="string">'canvas'</span>
Image = Canvas.Image
Fiber = require <span class="string">'fibers'</span>
fs = require <span class="string">'fs'</span>
<span class="keyword">else</span>
Root = window</pre></div></div>
</li>
<li id="section-2">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-2">¶</a>
</div>
<p>Here it begins. Caman is defined.
There are many different initialization for Caman, which are described on the
<a href="http://camanjs.com/guides">Guides</a>.</p>
<p>Initialization is tricky because we need to make sure everything we need is actually fully
loaded in the DOM before proceeding. When initialized on an image, we need to make sure that the
image is done loading before converting it to a canvas element and writing the pixel data. If we
do this prematurely, the browser will throw a DOM Error, and chaos will ensue. In the event that
we initialize Caman on a canvas element while specifying an image URL, we need to create a new
image element, load the image, then continue with initialization.</p>
<p>The main goal for Caman was simplicity, so all of this is handled transparently to the end-user. </p>
</div>
<div class="content"><div class='highlight'><pre><span class="class"><span class="keyword">class</span> <span class="title">Caman</span> <span class="keyword">extends</span> <span class="title">Module</span></span></pre></div></div>
</li>
<li id="section-3">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-3">¶</a>
</div>
<p>The current version.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@version</span>:
release: <span class="string">"4.1.1"</span>
date: <span class="string">"4/8/2013"</span></pre></div></div>
</li>
<li id="section-4">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-4">¶</a>
</div>
<p>@property [Boolean] Debug mode enables console logging.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@DEBUG</span>: <span class="literal">false</span></pre></div></div>
</li>
<li id="section-5">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-5">¶</a>
</div>
<p>@property [Boolean] Allow reverting the canvas?
If your JS process is running out of memory, disabling
this could help drastically.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@allowRevert</span>: <span class="literal">true</span></pre></div></div>
</li>
<li id="section-6">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-6">¶</a>
</div>
<p>@property [String] Default cross-origin policy.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@crossOrigin</span>: <span class="string">"anonymous"</span></pre></div></div>
</li>
<li id="section-7">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-7">¶</a>
</div>
<p>@property [String] Set the URL of the image proxy script.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@remoteProxy</span>: <span class="string">""</span></pre></div></div>
</li>
<li id="section-8">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-8">¶</a>
</div>
<p>@proparty [String] The GET param used with the proxy script.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@proxyParam</span>: <span class="string">"camanProxyUrl"</span></pre></div></div>
</li>
<li id="section-9">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-9">¶</a>
</div>
<p>@property [Boolean] Are we in a NodeJS environment?</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@NodeJS</span>: exports?</pre></div></div>
</li>
<li id="section-10">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-10">¶</a>
</div>
<p>@property [Boolean] Should we check the DOM for images with Caman instructions?</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@autoload</span>: <span class="keyword">not</span> Caman.NodeJS</pre></div></div>
</li>
<li id="section-11">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-11">¶</a>
</div>
<p>Custom toString()
@return [String] Version and release information.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@toString</span>: ->
<span class="string">"Version "</span> + Caman.version.release + <span class="string">", Released "</span> + Caman.version.date;</pre></div></div>
</li>
<li id="section-12">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-12">¶</a>
</div>
<p>Get the ID assigned to this canvas by Caman.
@param [DOMObject] canvas The canvas to inspect.
@return [String] The Caman ID associated with this canvas.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@getAttrId</span>: (canvas) ->
<span class="keyword">return</span> <span class="literal">true</span> <span class="keyword">if</span> Caman.NodeJS
<span class="keyword">if</span> <span class="keyword">typeof</span> canvas <span class="keyword">is</span> <span class="string">"string"</span>
canvas = $(canvas)
<span class="keyword">return</span> <span class="literal">null</span> <span class="keyword">unless</span> canvas? <span class="keyword">and</span> canvas.getAttribute?
canvas.getAttribute <span class="string">'data-caman-id'</span></pre></div></div>
</li>
<li id="section-13">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-13">¶</a>
</div>
<p>The Caman function. While technically a constructor, it was made to be called without
the <code>new</code> keyword. Caman will figure it out.</p>
<p>@param [DOMObject, String] initializer The DOM selector or DOM object to initialize.
@overload Caman(initializer)
Initialize Caman without a callback.</p>
<p>@overload Caman(initializer, callback)
Initialize Caman with a callback.
@param [Function] callback Function to call once initialization completes.</p>
<p>@overload Caman(initializer, url)
Initialize Caman with a URL to an image and no callback.
@param [String] url URl to an image to draw to the canvas.</p>
<p>@overload Caman(initializer, url, callback)
Initialize Caman with a canvas, URL to an image, and a callback.
@param [String] url URl to an image to draw to the canvas.
@param [Function] callback Function to call once initialization completes.</p>
<p>@overload Caman(file)
<strong>NodeJS</strong>: Initialize Caman with a path to an image file and no callback.
@param [String, File] file File object or path to image to read.</p>
<p>@overload Caman(file, callback)
<strong>NodeJS</strong>: Initialize Caman with a file and a callback.
@param [String, File] file File object or path to image to read.
@param [Function] callback Function to call once initialization completes.</p>
<p>@return [Caman] Initialized Caman instance.</p>
</div>
<div class="content"><div class='highlight'><pre> constructor: ->
<span class="keyword">throw</span> <span class="string">"Invalid arguments"</span> <span class="keyword">if</span> arguments.length <span class="keyword">is</span> <span class="number">0</span>
<span class="keyword">if</span> @ <span class="keyword">instanceof</span> Caman</pre></div></div>
</li>
<li id="section-14">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-14">¶</a>
</div>
<p>We have to do this to avoid polluting the global scope
because of how Coffeescript binds functions specified
with => and the fact that Caman can be invoked as both
a function and as a 'new' object.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@finishInit</span> = <span class="property">@finishInit</span>.bind(@)
<span class="property">@imageLoaded</span> = <span class="property">@imageLoaded</span>.bind(@)
args = arguments[<span class="number">0</span>]
<span class="keyword">unless</span> Caman.NodeJS
id = parseInt Caman.getAttrId(args[<span class="number">0</span>]), <span class="number">10</span>
callback = <span class="keyword">if</span> <span class="keyword">typeof</span> args[<span class="number">1</span>] <span class="keyword">is</span> <span class="string">"function"</span>
args[<span class="number">1</span>]
<span class="keyword">else</span> <span class="keyword">if</span> <span class="keyword">typeof</span> args[<span class="number">2</span>] <span class="keyword">is</span> <span class="string">"function"</span>
args[<span class="number">2</span>]
<span class="keyword">else</span>
->
<span class="keyword">if</span> !isNaN(id) <span class="keyword">and</span> Store.has(id)
<span class="keyword">return</span> Store.execute(id, callback)</pre></div></div>
</li>
<li id="section-15">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-15">¶</a>
</div>
<p>Every instance gets a unique ID. Makes it much simpler to check if two variables are the
same instance.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@id</span> = Util.uniqid.get()
<span class="property">@initializedPixelData</span> = <span class="property">@originalPixelData</span> = <span class="literal">null</span>
<span class="property">@cropCoordinates</span> = x: <span class="number">0</span>, y: <span class="number">0</span>
<span class="property">@cropped</span> = <span class="literal">false</span>
<span class="property">@resized</span> = <span class="literal">false</span>
<span class="property">@pixelStack</span> = [] <span class="comment"># Stores the pixel layers</span>
<span class="property">@layerStack</span> = [] <span class="comment"># Stores all of the layers waiting to be rendered</span>
<span class="property">@canvasQueue</span> = [] <span class="comment"># Stores all of the canvases to be processed</span>
<span class="property">@currentLayer</span> = <span class="literal">null</span>
<span class="property">@scaled</span> = <span class="literal">false</span>
<span class="property">@analyze</span> = <span class="keyword">new</span> Analyze @
<span class="property">@renderer</span> = <span class="keyword">new</span> Renderer @
<span class="property">@domIsLoaded</span> =>
<span class="property">@parseArguments</span>(args)
<span class="property">@setup</span>()
<span class="keyword">return</span> @
<span class="keyword">else</span>
<span class="keyword">return</span> <span class="keyword">new</span> Caman(arguments)</pre></div></div>
</li>
<li id="section-16">
<div class="annotation">
<div class="pilwrap ">
<a class="pilcrow" href="#section-16">¶</a>
</div>
<p>Checks to ensure the DOM is loaded. Ensures the callback is always fired, even
if the DOM is already loaded before it's invoked. The callback is also always
called asynchronously.</p>
<p>@param [Function] cb The callback function to fire when the DOM is ready.</p>
</div>
<div class="content"><div class='highlight'><pre> domIsLoaded: (cb) ->
<span class="keyword">if</span> Caman.NodeJS
setTimeout =>
cb.call(@)
, <span class="number">0</span>
<span class="keyword">else</span>
<span class="keyword">if</span> document.readyState <span class="keyword">is</span> <span class="string">"complete"</span>
Log.debug <span class="string">"DOM initialized"</span>
setTimeout =>
cb.call(@)
, <span class="number">0</span>
<span class="keyword">else</span>
<span class="function"><span class="title">listener</span></span> = =>
<span class="keyword">if</span> document.readyState <span class="keyword">is</span> <span class="string">"complete"</span>
Log.debug <span class="string">"DOM initialized"</span>
cb.call(@)
document.addEventListener <span class="string">"readystatechange"</span>, listener, <span class="literal">false</span></pre></div></div>
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<p>Parses the arguments given to the Caman function, and sets the appropriate
properties on this instance.</p>
<p>@params [Array] args Array of arguments passed to Caman.</p>
</div>
<div class="content"><div class='highlight'><pre> parseArguments: (args) ->
<span class="keyword">throw</span> <span class="string">"Invalid arguments given"</span> <span class="keyword">if</span> args.length <span class="keyword">is</span> <span class="number">0</span></pre></div></div>
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<p>Defaults</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="property">@initObj</span> = <span class="literal">null</span>
<span class="property">@initType</span> = <span class="literal">null</span>
<span class="property">@imageUrl</span> = <span class="literal">null</span>
<span class="property">@callback</span> = -></pre></div></div>
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<p>First argument is always our canvas/image</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@setInitObject</span> args[<span class="number">0</span>]
<span class="keyword">return</span> <span class="keyword">if</span> args.length <span class="keyword">is</span> <span class="number">1</span>
<span class="keyword">switch</span> <span class="keyword">typeof</span> args[<span class="number">1</span>]
<span class="keyword">when</span> <span class="string">"string"</span> <span class="keyword">then</span> <span class="property">@imageUrl</span> = args[<span class="number">1</span>]
<span class="keyword">when</span> <span class="string">"function"</span> <span class="keyword">then</span> <span class="property">@callback</span> = args[<span class="number">1</span>]
<span class="keyword">return</span> <span class="keyword">if</span> args.length <span class="keyword">is</span> <span class="number">2</span>
<span class="property">@callback</span> = args[<span class="number">2</span>]
<span class="keyword">if</span> args.length <span class="keyword">is</span> <span class="number">4</span>
<span class="property">@options</span>[key] = val <span class="keyword">for</span> own key, val <span class="keyword">of</span> args[<span class="number">4</span>]</pre></div></div>
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<p>Sets the initialization object for this instance.</p>
<p>@param [Object, String] obj The initialization argument.</p>
</div>
<div class="content"><div class='highlight'><pre> setInitObject: (obj) ->
<span class="keyword">if</span> Caman.NodeJS
<span class="property">@initObj</span> = obj
<span class="property">@initType</span> = <span class="string">'node'</span>
<span class="keyword">return</span>
<span class="keyword">if</span> <span class="keyword">typeof</span> obj <span class="keyword">is</span> <span class="string">"object"</span>
<span class="property">@initObj</span> = obj
<span class="keyword">else</span>
<span class="property">@initObj</span> = $(obj)
<span class="keyword">throw</span> <span class="string">"Could not find image or canvas for initialization."</span> <span class="keyword">unless</span> <span class="property">@initObj</span>?
<span class="property">@initType</span> = <span class="property">@initObj</span>.nodeName.toLowerCase()</pre></div></div>
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<p>Begins the setup process, which differs depending on whether we're in NodeJS,
or if an image or canvas object was provided.</p>
</div>
<div class="content"><div class='highlight'><pre> setup: ->
<span class="keyword">switch</span> <span class="property">@initType</span>
<span class="keyword">when</span> <span class="string">"node"</span> <span class="keyword">then</span> <span class="property">@initNode</span>()
<span class="keyword">when</span> <span class="string">"img"</span> <span class="keyword">then</span> <span class="property">@initImage</span>()
<span class="keyword">when</span> <span class="string">"canvas"</span> <span class="keyword">then</span> <span class="property">@initCanvas</span>()</pre></div></div>
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<p>Initialization function for NodeJS.</p>
</div>
<div class="content"><div class='highlight'><pre> initNode: ->
Log.debug <span class="string">"Initializing for NodeJS"</span>
<span class="property">@image</span> = <span class="keyword">new</span> Image()
<span class="property">@image</span>.<span class="function"><span class="title">onload</span></span> = =>
Log.debug <span class="string">"Image loaded. Width = <span class="subst">#{@imageWidth()}</span>, Height = <span class="subst">#{@imageHeight()}</span>"</span>
<span class="property">@canvas</span> = <span class="keyword">new</span> Canvas <span class="property">@imageWidth</span>(), <span class="property">@imageHeight</span>()
<span class="property">@finishInit</span>()
<span class="property">@image</span>.<span class="function"><span class="title">onerror</span></span> = (err) -> <span class="keyword">throw</span> err
<span class="property">@image</span>.src = <span class="property">@initObj</span></pre></div></div>
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<p>Initialization function for the browser and image objects.</p>
</div>
<div class="content"><div class='highlight'><pre> initImage: ->
<span class="property">@image</span> = <span class="property">@initObj</span>
<span class="property">@canvas</span> = document.createElement <span class="string">'canvas'</span>
<span class="property">@context</span> = <span class="property">@canvas</span>.getContext <span class="string">'2d'</span>
Util.copyAttributes <span class="property">@image</span>, <span class="property">@canvas</span>, except: [<span class="string">'src'</span>]
<span class="property">@image</span>.parentNode.replaceChild <span class="property">@canvas</span>, <span class="property">@image</span>
<span class="property">@imageAdjustments</span>()
<span class="property">@waitForImageLoaded</span>()</pre></div></div>
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<p>Initialization function for the browser and canvas objects.</p>
</div>
<div class="content"><div class='highlight'><pre> initCanvas: ->
<span class="property">@canvas</span> = <span class="property">@initObj</span>
<span class="property">@context</span> = <span class="property">@canvas</span>.getContext <span class="string">'2d'</span>
<span class="keyword">if</span> <span class="property">@imageUrl</span>?
<span class="property">@image</span> = document.createElement <span class="string">'img'</span>
<span class="property">@image</span>.src = <span class="property">@imageUrl</span>
<span class="property">@imageAdjustments</span>()
<span class="property">@waitForImageLoaded</span>()
<span class="keyword">else</span>
<span class="property">@finishInit</span>()</pre></div></div>
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<p>Automatically check for a HiDPI capable screen and swap out the image if possible.
Also checks the image URL to see if it's a cross-domain request, and attempt to
proxy the image. If a cross-origin type is configured, the proxy will be ignored.</p>
</div>
<div class="content"><div class='highlight'><pre> imageAdjustments: ->
<span class="keyword">if</span> <span class="property">@needsHiDPISwap</span>()
Log.debug <span class="property">@image</span>.src, <span class="string">"->"</span>, <span class="property">@hiDPIReplacement</span>()
<span class="property">@swapped</span> = <span class="literal">true</span>
<span class="property">@image</span>.src = <span class="property">@hiDPIReplacement</span>()
<span class="keyword">if</span> IO.isRemote(<span class="property">@image</span>)
<span class="property">@image</span>.src = IO.proxyUrl(<span class="property">@image</span>.src)
Log.debug <span class="string">"Remote image detected, using URL = <span class="subst">#{@image.src}</span>"</span></pre></div></div>
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<p>Utility function that fires {Caman#imageLoaded} once the image is finished loading.</p>
</div>
<div class="content"><div class='highlight'><pre> waitForImageLoaded: ->
<span class="keyword">if</span> <span class="property">@isImageLoaded</span>()
<span class="property">@imageLoaded</span>()
<span class="keyword">else</span>
<span class="property">@image</span>.onload = <span class="property">@imageLoaded</span></pre></div></div>
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<p>Checks if the given image is finished loading.
@return [Boolean] Is the image loaded?</p>
</div>
<div class="content"><div class='highlight'><pre> isImageLoaded: ->
<span class="keyword">return</span> <span class="literal">false</span> <span class="keyword">unless</span> <span class="property">@image</span>.complete</pre></div></div>
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<p>Internet Explorer is weird.</p>
</div>
<div class="content"><div class='highlight'><pre> <span class="keyword">return</span> <span class="literal">false</span> <span class="keyword">if</span> <span class="property">@image</span>.naturalWidth? <span class="keyword">and</span> <span class="property">@image</span>.naturalWidth <span class="keyword">is</span> <span class="number">0</span>
<span class="keyword">return</span> <span class="literal">true</span></pre></div></div>
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<p>Internet Explorer has issues figuring out image dimensions when they aren't
explicitly defined, apparently. We check the normal width/height properties first,
but fall back to natural sizes if they are 0.
@return [Number] Width of the initialization image.</p>
</div>
<div class="content"><div class='highlight'><pre> imageWidth: -> <span class="property">@image</span>.width <span class="keyword">or</span> <span class="property">@image</span>.naturalWidth</pre></div></div>
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<p>@see Caman#imageWidth
@return [Number] Height of the initialization image.</p>
</div>
<div class="content"><div class='highlight'><pre> imageHeight: -> <span class="property">@image</span>.height <span class="keyword">or</span> <span class="property">@image</span>.naturalHeight</pre></div></div>
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<p>Function that is called once the initialization image is finished loading.
We make sure that the canvas dimensions are properly set here.</p>
</div>
<div class="content"><div class='highlight'><pre> imageLoaded: ->
Log.debug <span class="string">"Image loaded. Width = <span class="subst">#{@imageWidth()}</span>, Height = <span class="subst">#{@imageHeight()}</span>"</span>
<span class="keyword">if</span> <span class="property">@swapped</span>
<span class="property">@canvas</span>.width = <span class="property">@imageWidth</span>() / <span class="property">@hiDPIRatio</span>()
<span class="property">@canvas</span>.height = <span class="property">@imageHeight</span>() / <span class="property">@hiDPIRatio</span>()
<span class="keyword">else</span>
<span class="property">@canvas</span>.width = <span class="property">@imageWidth</span>()
<span class="property">@canvas</span>.height = <span class="property">@imageHeight</span>()
<span class="property">@finishInit</span>()</pre></div></div>
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<p>Final step of initialization. We finish setting up our canvas element, and we
draw the image to the canvas (if applicable).</p>
</div>
<div class="content"><div class='highlight'><pre> finishInit: ->
<span class="property">@context</span> = <span class="property">@canvas</span>.getContext <span class="string">'2d'</span> <span class="keyword">unless</span> <span class="property">@context</span>?
<span class="property">@originalWidth</span> = <span class="property">@preScaledWidth</span> = <span class="property">@width</span> = <span class="property">@canvas</span>.width
<span class="property">@originalHeight</span> = <span class="property">@preScaledHeight</span> = <span class="property">@height</span> = <span class="property">@canvas</span>.height
<span class="property">@hiDPIAdjustments</span>()
<span class="property">@assignId</span>() <span class="keyword">unless</span> <span class="property">@hasId</span>()
<span class="keyword">if</span> <span class="property">@image</span>?
<span class="property">@context</span>.drawImage <span class="property">@image</span>,
<span class="number">0</span>, <span class="number">0</span>,
<span class="property">@imageWidth</span>(), <span class="property">@imageHeight</span>(),
<span class="number">0</span>, <span class="number">0</span>,
<span class="property">@preScaledWidth</span>, <span class="property">@preScaledHeight</span>
<span class="property">@imageData</span> = <span class="property">@context</span>.getImageData <span class="number">0</span>, <span class="number">0</span>, <span class="property">@canvas</span>.width, <span class="property">@canvas</span>.height
<span class="property">@pixelData</span> = <span class="property">@imageData</span>.data
<span class="keyword">if</span> Caman.allowRevert
<span class="property">@initializedPixelData</span> = Util.dataArray(<span class="property">@pixelData</span>.length)
<span class="property">@originalPixelData</span> = Util.dataArray(<span class="property">@pixelData</span>.length)
<span class="keyword">for</span> pixel, i <span class="keyword">in</span> <span class="property">@pixelData</span>
<span class="property">@initializedPixelData</span>[i] = pixel
<span class="property">@originalPixelData</span>[i] = pixel
<span class="property">@dimensions</span> =
width: <span class="property">@canvas</span>.width
height: <span class="property">@canvas</span>.height
Store.put <span class="property">@id</span>, @
<span class="property">@callback</span>.call @,@</pre></div></div>
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<p>Reset the callback so re-initialization doesn't
trigger it again.</p>
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<div class="content"><div class='highlight'><pre> <span class="property">@callback</span> = -></pre></div></div>
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<p>If you have a separate context reference to this canvas outside of CamanJS
and you make a change to the canvas outside of CamanJS, you will have to call
this function to update our context reference to include those changes.</p>
</div>
<div class="content"><div class='highlight'><pre> reloadCanvasData: ->
<span class="property">@imageData</span> = <span class="property">@context</span>.getImageData <span class="number">0</span>, <span class="number">0</span>, <span class="property">@canvas</span>.width, <span class="property">@canvas</span>.height
<span class="property">@pixelData</span> = <span class="property">@imageData</span>.data</pre></div></div>
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<p>Reset the canvas pixels to the original state at initialization.</p>
</div>
<div class="content"><div class='highlight'><pre> resetOriginalPixelData: ->
<span class="keyword">throw</span> <span class="string">"Revert disabled"</span> <span class="keyword">unless</span> Caman.allowRevert
<span class="property">@originalPixelData</span> = Util.dataArray(<span class="property">@pixelData</span>.length)
<span class="property">@originalPixelData</span>[i] = pixel <span class="keyword">for</span> pixel, i <span class="keyword">in</span> <span class="property">@pixelData</span></pre></div></div>
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<p>Does this instance have an ID assigned?
@return [Boolean] Existance of an ID.</p>
</div>
<div class="content"><div class='highlight'><pre> hasId: -> Caman.getAttrId(<span class="property">@canvas</span>)?</pre></div></div>
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<p>Assign a unique ID to this instance.</p>
</div>
<div class="content"><div class='highlight'><pre> assignId: ->
<span class="keyword">return</span> <span class="keyword">if</span> Caman.NodeJS <span class="keyword">or</span> <span class="property">@canvas</span>.getAttribute <span class="string">'data-caman-id'</span>
<span class="property">@canvas</span>.setAttribute <span class="string">'data-caman-id'</span>, <span class="property">@id</span></pre></div></div>
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