fill_ellipse (Imlib2::Image)

    /*
     * Fill an ellipse at the specified coordinates with the given color
     *
     * Examples:
     *   # fill an ellipse in the center of the image using the context color
     *   xc, yc, w, h = image.w / 2, image.h / 2, image.w / 2, image.h / 2
     *   image.draw_oval xc, yc, w, h
     *
     *   # fill a violet circle in the center of the image
     *   rect = [image.w / 2, image.h / 2, image.w / 2, image.w / 2]
     *   color = Imlib2::Color::VIOLET
     *   image.draw_ellipse rect, color
     *
     */
    static VALUE image_fill_ellipse(int argc, VALUE *argv, VALUE self) {