ffimage 0.10.0

Foreign function image handling
Documentation 
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use ffimage::color::{Gray, Rgb};
use ffimage::iter::{BytesExt, ColorConvertExt, PixelsExt};

fn main() {
    // This is our RGB image memory (2x2 pixels).
    // Usually, this will be allocated by a foreign function (e.g. kernel driver) and contain
    // read-only memory.
    let rgb = [10; 4 * 3];
    // We need an output buffer as well to host the converted grayscale pixels.
    let mut gray = [0; 4 * 1];

    // Convert from rgb to grayscale by mapping each pixel. The Pixels iterator extension creates
    // a typed pixel iterator from a bytestream. The ColorConvert extension knows how to convert
    // between pixel types and the Write extension finally writes the pixels back into a
    // bytestream.
    rgb.iter()
        .copied()
        .pixels::<Rgb<u8>>()
        .colorconvert::<Gray<u8>>()
        .bytes()
        .write(&mut gray);
}