Function bc4 

pub fn bc4(
    compressed_block: &[u8],
    decompressed_block: &mut [u8],
    destination_pitch: usize,
    is_signed: bool,
)

Decode 8 bytes from compressed_block to R8 with destination_pitch many bytes per output row.

Examples

// Decode a single 4x4 pixel block.
let compressed_block = [0u8; 8];
let mut decompressed_block = [0u8; 4 * 4];
bcdec_rs::bc4(&compressed_block, &mut decompressed_block, 4, false);