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decrypting.js
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decrypting.js
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/*creating the global variables*/
var fgImage = null;
var canvas1;
var secImage = null;
function clearImages(){
clearScreen(canvas1);
clearScreen(canvas2);
}
function clearScreen(canvas){
var ctx = canvas.getContext('2d');
ctx.clearRect(0,0,canvas.width, canvas.height);
}
/*code for decrypting the images*/
function secImg(){
canvas1 =document.getElementById('can1');
var imgFile = document.getElementById('secret_img');
secImage = new SimpleImage(imgFile);
secImage.drawTo(canvas1);
}
function decrypting(){
if(secImage == null || !secImage.complete() ){
alert("secret image not loaded properly");
return;
}
var result = decryptingImage();
var canvas2 = document.getElementById('can2');
result.drawTo(canvas2);
}
function decryptingImage(){
var decryptedImg = new SimpleImage(secImage.getWidth(), secImage.getHeight());
for (var pixel of decryptedImg.values()){
var x = pixel.getX();
var y = pixel.getY();
var img = secImage.getPixel(x,y);
pixel.setRed((img.getRed()%16)*16);
pixel.setBlue((img.getBlue()%16)*16);
pixel.setGreen((img.getGreen()%16)*16);
}
return decryptedImg;
}