Function libheif_sys::heif_image_add_plane

pub unsafe extern "C" fn heif_image_add_plane(
    image: *mut heif_image,
    channel: heif_channel,
    width: c_int,
    height: c_int,
    bit_depth: c_int
) -> heif_error

The indicated bit_depth corresponds to the bit depth per channel. I.e. for interleaved formats like RRGGBB, the bit_depth would be, e.g., 10 bit instead of 30 bits or 3*16=48 bits. For backward compatibility, one can also specify 24bits for RGB and 32bits for RGBA, instead of the preferred 8 bits.