Processing mirror image over x axis?

I was able to copy the image to the location but not able to mirror it. what am i missing?

PImage img; 
float srcY;
float srcX;
int destX;
int destY;

img = loadImage("http://ift.tt/19iOGYC Beach-State-College2-e1329949470871.jpg");

size(img.width, img.height * 2);

image(img, 0, 0);
image(img, 0, 330);

int num_pixels = img.width * img.height;

int copiedWidth = 319 - 254;
int copiedHeight = 85 - 22;
int startX = (width / 2) - (copiedWidth / 2);
int startY = (height / 2) - (copiedHeight / 2);