Here’s how to moderately obfuscate your image:
It works by scrambling your map so the casual user cannot easily view it.
- Slice your image vertically and horizontally into many pieces.
- Scramble all those pieces and create a new scrambled image from them.
- Serve that scrambled image to the web page (this scrambled image is unrecognizable to the user).
- Save the scrambling order in a JSON array so you can later descramble the image.
Obfuscating Demo: http://jsfiddle.net/m1erickson/wWbt5/
When you need the image, unscramble it into an in-memory canvas that the user can’t see, but which you can programatically use in your game.
De-obfuscating Demo: http://jsfiddle.net/m1erickson/UtN6g/
Code for obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px;}
#obfuscated{border:1px solid blue;}
#canvas{border:1px solid red;}
</style>
<script>
$(function(){
var img=new Image();
img.onload=start;
img.crossOrigin="anonymous";
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
var verticalSlices=60;
var horizontalSlices=60;
var sliceCount=verticalSlices*horizontalSlices;
var sliceWidth,sliceHeight;
var slices=[];
var json;
function start(){
// vars for slice sizes
sliceWidth=img.width/verticalSlices;
sliceHeight=img.height/horizontalSlices;
// create a slices array to be used to scramble our image
for(var i=0;i<sliceCount;i++){ slices.push(i); }
slices=shuffle(slices);
// scramble the original image
var $obfuscatedImage=document.getElementById("obfuscated");
$obfuscatedImage.src=obfuscate(img,slices);
// create a JSON array used to descramble the image
slices.unshift(verticalSlices,horizontalSlices);
json=JSON.stringify(slices);
}
function obfuscate(img,slices){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=img.width;
tempCanvas.height=img.height;
for(var i=0;i<slices.length;i++){
var s=slices[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(img,
x,y,sliceWidth,sliceHeight,
canvasX,canvasY,sliceWidth,sliceHeight);
}
return(tempCanvas.toDataURL());
}
function shuffle(array) {
var currentIndex = array.length,temporaryValue,randomIndex;
while (0 !== currentIndex) {
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
}); // end $(function(){});
</script>
</head>
<body>
<p>Before scrambling</p>
<img src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/koolaidman.png"><br>
<p>After scrambling</p>
<img id="obfuscated" width=300 height=300>
</body>
</html>
Code for de-obfuscating
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; padding:20px; }
#obfuscated{border:1px solid red;}
#clarify{margin:10px;}
canvas{border:1px solid blue;}
p{margin:10px;}
</style>
<script>
$(function(){
// this json would be downloaded from the server
// first 2 elements are images width,height
// next 2 elements are #vertical,#horizontal slices
var 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var keys=JSON.parse(json);
$button=document.getElementById("clarify");
$button.style.display="none";
var img=new Image();
img.onload=function(){
$button.style.display="block";
}
img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png";
function deobfuscate(obfuscatedImage,keys){
var tempCanvas=document.createElement("canvas");
var tempCtx=tempCanvas.getContext('2d');
tempCanvas.width=obfuscatedImage.width;
tempCanvas.height=obfuscatedImage.height;
var verticalSlices=keys.shift();
var horizontalSlices=keys.shift();
var sliceWidth=tempCanvas.width/verticalSlices;
var sliceHeight=tempCanvas.height/horizontalSlices;
for(var i=0;i<keys.length;i++){
var s=keys[i];
var row=parseInt(s/verticalSlices);
var col=s-row*verticalSlices;
var x=col*sliceWidth;
var y=row*sliceHeight;
var canvasRow=parseInt(i/verticalSlices);
var canvasCol=i-canvasRow*verticalSlices;
var canvasX=canvasCol*sliceWidth;
var canvasY=canvasRow*sliceHeight;
tempCtx.drawImage(obfuscatedImage,
canvasX,canvasY,sliceWidth,sliceHeight,
x,y,sliceWidth,sliceHeight);
}
return(tempCanvas);
}
$("#clarify").click(function(){
var canvas=deobfuscate(img,keys);
document.body.appendChild(canvas);
});
}); // end $(function(){});
</script>
</head>
<body>
<button id="clarify">De-obfuscate</button>
<p>The obfuscated image</p>
<img id="obfuscated" src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/obfuscated.png">
<p>The de-obfuscated canvas</p><br>
</body>
</html>
