Image crop and resize

function cropFromMiddleAndResize(aBlob) {

    var newBlob = null;
    var px;
    var py;
    var width;
    var height;
    var mediawidth = aBlob.width;
    var mediaheight = aBlob.height;
    var resize = 150;

    if (mediawidth > mediaheight) {
        px = (mediawidth - mediaheight) / 2;
        py = 0;
        width = mediaheight;
        height = mediaheight;
    } else {
        py = (mediaheight - mediawidth) / 2;
        px = 0;
        width = mediawidth;
        height = mediawidth;
    }

    var tempimage = (OS_IOS) ? (aBlob.imageAsResized(mediawidth, mediaheight)) : (aBlob);
    //https://jira.appcelerator.org/browse/TIMOB-4865
    newBlob = tempimage.imageAsCropped({
        width : width,
        height : height,
        x : px,
        y : py
    });
    newBlob = newBlob.imageAsResized(resize, resize);

    return newBlob;

}