Function astc_decode_block 

pub fn astc_decode_block<F: FnMut(u32, u32, [u8; 4])>(
    input: &[u8; 16],
    footprint: Footprint,
    writer: F,
) -> bool

Decode an ASTC block from a 16-byte buffer.

• input contains the raw ASTC data for one block.
• footprint specifies the footprint size.
• writer is a function with signature FnMut(x: u32, y: u32, color: [u8; 4]). It is used to output decoded pixels. This function will be called once for each pixel (x, y) in the rectangle [0, footprint.width()) * [0, footprint.height()). Each element in color represents the R, G, B, and A channel, respectively.
• returns true if the block is successfully decoded; false if the block contains illegal encoding.

let footprint = astc_decode::Footprint::new(6, 6);
// Exmaple input. Not necessarily a valid ASTC block
let input = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
let mut output = [[0; 4]; 6 * 6];
astc_decode::astc_decode_block(&input, footprint, |x, y, color| {
    output[(x + y * 6) as usize] = color;
});