Function lv_image_buf_get_transformed_area 

pub unsafe extern "C" fn lv_image_buf_get_transformed_area(
    res: *mut lv_area_t,
    w: i32,
    h: i32,
    angle: i32,
    scale_x: u16,
    scale_y: u16,
    pivot: *const lv_point_t,
)