Function encode_slice_masked 

pub fn encode_slice_masked<T: Sample>(
    width: u32,
    height: u32,
    data: &[T],
    mask: &BitMask,
    precision: Precision<T>,
) -> Result<Vec<u8>>

Encode a single-band image with a validity mask.

The pixel type T determines the LERC data type automatically via Sample. Returns an error if data.len() != width * height or if the mask size does not match.