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<!doctype html>
<html>
<head>
<title>Gif Dither</title>
</head>
<body>
<div>
<!-- <button id="random">random</button> -->
<button id="pattern2Lite">pattern2lite</button>
<button id="pattern3Lite">pattern3lite</button>
<button id="pattern4Lite">pattern4lite</button>
<button id="floydSteinberg">floyd-steinberg</button>
<button id="pattern4">pattern4</button>
<button id="pattern3">pattern3</button>
<!-- <button id="right">right</button> -->
<input type="text" id="url" value="img/1376516658960-dumpfm-DoritoWitch-TimeFLyTrans0001.png">
<button id="encode">ENCODE</button>
<button id="save">SAVE</button>
<span id="loading"></span>
</div>
<div id="images"></div>
</body>
<script type="text/javascript" src="js/vendor/gif-encode/util.js"></script>
<script type="text/javascript" src="js/vendor/gif-encode/tube.js"></script>
<script type="text/javascript" src="js/vendor/gif-encode/client.js"></script>
<script type="text/javascript" src="js/vendor/gif.js"></script>
<script type="text/javascript" src="js/vendor/FileSaver/FileSaver.js"></script>
<script type="text/javascript" src="js/vendor/dataUriToBlob.js"></script>
<script type="text/javascript" src="js/vendor/canvasquery.js"></script>
<script type="text/javascript" src="js/canvasquery.dither.js"></script>
<script type="text/javascript" src="js/util.js"></script>
<script type="text/javascript">
document.getElementById("url").onchange = load
setTimeout(init)
function init () {
bind()
// load()
}
function load(){
document.getElementById("save").style.display = "none"
var imageURL = document.getElementById("url").value
loadImage(imageURL, ready)
}
// UI
function status (s){
var el = document.getElementById("loading")
el.innerHTML = s + "..."
}
function bind(){
var buttons = document.getElementsByTagName("button")
for (var i = 0; i < buttons.length; i++) {
(function(n){
buttons[n].onclick = function(){
algo = buttons[n].id;
build()
}
})(i)
}
document.getElementById("save").onclick = save
document.getElementById("encode").onclick = encode
}
var encoder = new GifEncoder()
encoder.on("quantized", function(url){
status("encoding")
encoder.encode()
})
encoder.on("rendered-url", function(url){
status("")
var image = new Image ()
image.src = url
document.body.appendChild(image)
lastGif = url
document.getElementById("save").style.display = "inline"
})
function save (){
if (!lastGif) return;
var filename = document.getElementById("url").value.replace(/^.*\//,"").replace(/\.gif.*$/,"")
var blob = dataUriToBlob(lastGif); // new Blob ([lastGif], {type: "image/gif"});
saveAs(blob, filename + "-" + algo + "-" + (+new Date() % 1000) + ".gif");
}
function ready(){
if (window.gif) gif.off("rendered", ready)
status("")
document.getElementById("save").style.display = "none"
document.getElementById("encode").style.display = "inline"
build()
}
var algo = "random"
var frames = []
function build(){
status("dithering")
encoder.resetFrames()
document.getElementById("images").innerHTML = ""
if (window.gif) {
var buttons = document.getElementsByTagName("button")
var bz = []
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].id != "save" && buttons[i].id != "encode") bz.push(buttons[i].id)
}
gif.frames.forEach(function(frame, i){
var algo = bz[i % bz.length]
var cc = dither(frame)
encoder.addFrame(cc.canvas)
})
}
else {
var frame = { ctx: { canvas: window.img } };
var buttons = document.getElementsByTagName("button")
for (var i = 0; i < buttons.length; i++) {
if (buttons[i].id != "save" && buttons[i].id != "encode") {
algo = buttons[i].id;
var cc = dither(frame)
encoder.addFrame(cc.canvas)
}
}
}
encode()
}
function encode(){
if (! encoder.quantized) {
status("quantizing")
encoder.quantize()
}
else {
status("encoding")
encoder.encode()
}
}
function dither(frame){
var canvas = frame.ctx.canvas
var w = canvas.width, h = canvas.height;
var cc = cq(w, h)
cc.drawImage(canvas, 0, 0, w, h);
cc[algo + "Dither"]( )
return cc
// cc.appendTo("#images")
}
</script>
</html>
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