create_cropped_scaled (Imlib2::Image)

    /*
     * Create a cropped and scaled copy of an image
     *
     * Examples:
     *   iw, ih = old_image.width, old_image.height
     *   new_w, new_h = iw - 20, ih - 20
     *   x, y, w, h = 10, 10, iw - 10, ih - 10
     *   new_image = old_image.crop_scaled x, y, w, h, new_w, new_h
     *
     *   iw, ih = old_image.width, old_image.height
     *   new_w, new_h = iw - 20, ih - 20
     *   values = [10, 10, iw - 10, iw - 10, new_w, new_h]
     *   new_image = old_image.crop_scaled values
     *
     *   iw, ih = old_image.width, old_image.height
     *   new_w, new_h = iw - 20, ih - 20
     *   x, y, w, h = 10, 10, iw - 10, ih - 10
     *   new_image = old_image.create_crop_scaled x, y, w, h, new_w, new_h
     *
     *   iw, ih = old_image.width, old_image.height
     *   new_w, new_h = iw - 20, ih - 20
     *   values = [10, 10, iw - 10, iw - 10, new_w, new_h]
     *   new_image = old_image.create_crop_scaled values
     *
     */
    static VALUE image_crop_scaled(int argc, VALUE *argv, VALUE self) {