Function imagefmt::write_region

pub fn write_region<P>(
    filepath: P, 
    w: usize, 
    h: usize, 
    src_fmt: ColFmt, 
    data: &[u8], 
    tgt_type: ColType, 
    rx: usize, 
    ry: usize, 
    rw: usize, 
    rh: usize
) -> Result<()> where
    P: AsRef<Path>, 

Writes a region of an image and converts it to requested color type.

The region is defined by the top-left coordinates rx and ry and the width and height rw and rh.