Resize image without stretch

[blowsie]

It would be great if the tool had a function to do something like this. (Resizing without stretching)

        var w = image.width(),
            h = image.height(),
            padX = 0,
            padY = 0;

        if (w > h) {
            padY = [w - h] / 2;
        } else if (h > w) {
            padX = [h - w] / 2;
        }


        image
            .batch()
            .pad(padX, padY, padX, padY, 'white')
            .resize(160,160)