Bevy read pixel

read_pixel.rs

/// Shows the basics of reading a pixel color value from an `Image` in Bevy
/// Pass in a handle to indicate which `Image` you're interested in
/// In this example I'm passing in a `LevelHandle` to snag an image used for a level
pub(crate) fn read_pixel(
    query: Query<&Handle<Image>, With<LevelHandle>>,
    images: Res<Assets<Image>>,
) {
    let handle = query.single();
      
    // the coordinates should be passed in through a Query
    let x: usize = 100;
    let y: usize = 100;

    if let Some(img) = images.get(handle) {
        let width = img.texture_descriptor.size.width as usize;
        let index = 4 * (x + width * y);
        let rgba = &img.data[index..index + 4];
        let r = rgba[0];
        let g = rgba[1];
        let b = rgba[2];
        let a = rgba[3];
        println!("RGBA: ({}, {}, {}, {})", r, g, b, a);
    }
}