Incular Docs

BoxFit is the ImageFit alias.

use incular::prelude::*;

fn main() {
    let fits = [
        BoxFit::Fill,
        BoxFit::Contain,
        BoxFit::Cover,
        BoxFit::FitWidth,
        BoxFit::FitHeight,
        BoxFit::None,
        BoxFit::ScaleDown,
    ];
    println!("fits: {}", fits.len());
}

Variant	Layout
`Fill`	Stretch, ignoring aspect
`Contain`	Fit inside, full content visible (default)
`Cover`	Fill bounds, cropping overflow
`FitWidth`	Match width, height follows
`FitHeight`	Match height, width follows
`None`	Natural size, centered
`ScaleDown`	Like `None`, but shrink if too big

Used by FittedBox (fit, default Contain) and Image.

use incular::prelude::*;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let pixels = ImageHandle::from_rgba8(2, 2, vec![255u8; 16]).expect("image");
    let app = Application::new(move |_cx| {
        Container::builder()
            .padding(EdgeInsets::all(24.0))
            .alignment(Alignment::CENTER)
            .child(
                SizedBox::new()
                    .width(200.0)
                    .height(120.0)
                    .child(                Image::new(pixels.clone()).fit(BoxFit::Cover)),
            )
            .build()
            .into()
    })?;
    incular::run(app)?;
    Ok(())
}

Related: Image.