var imgTemp;//horrible to do this but...

var mask;

var ctx;

​

function setup() {

  var desiredWidth = 256 * 2;

  var desiredHeight = 256 * 2;

  createCanvas(desiredWidth, desiredHeight);

  img = loadImage('porsche.png');

  img1 = loadImage('porsche.png');

  mask = createGraphics(desiredWidth, desiredHeight);

}

​

function draw() {

  background(220);

  mask.clear();

  mask.fill(255);

  mask.ellipse(mouseX, mouseY, 128);

  //mask.rect(mouseX, mouseY, 128, 128);  

  img1.copy(img, 0, 0, width, height, 0, 0, width, height);

  img1.mask(mask);

  image(img1, 0, 0, width, height);

  fill(0, 255, 0);

  text(frameRate(), 10, 10);

}