What order does PixelGrabber put pixels into the array in java?

What order does PixelGrabber put pixels into the array in java? Does it take the pixels along the width of the image first? Or along the height of the image first?

public static int[] convertImgToPixels(Image img, int width, int height) {
    int[] pixel = new int[width * height]; 
    PixelGrabber pixels = new PixelGrabber(img, 0, 0, width, height, pixel, 0, width); 
    try { 
        pixels.grabPixels(); 
    } catch (InterruptedException e) { 
        throw new IllegalStateException("Interrupted Waiting for Pixels"); 
    } 
    if ((pixels.getStatus() & ImageObserver.ABORT) != 0) { 
        throw new IllegalStateException("Image Fetch Aborted"); 
    } 
    return pixel; 
}