Function fltk::draw::draw_rgba_nocopy

source · 
pub unsafe fn draw_rgba_nocopy<T: WidgetBase>(wid: &mut T, fb: &[u8])
Expand description

Draw a framebuffer (rgba) into a widget

Safety

The data passed should be valid and outlive the widget

Examples found in repository?
examples/fb.rs (line 28)
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fn main() -> Result<(), Box<dyn std::error::Error>> {
    let app = app::App::default();
    let mut win = Window::default()
        .with_size(WIDTH, HEIGHT)
        .with_label("Framebuffer");
    let mut frame = frame::Frame::default_fill();
    win.end();
    win.make_resizable(true);
    win.show();

    let mut framebuf: Vec<u8> = vec![0; (WIDTH * HEIGHT * 4) as usize];
    let mut world = World::new();

    unsafe {
        draw::draw_rgba_nocopy(&mut frame, &framebuf);
    }

    app::add_idle3(move |_| {
        world.update();
        world.draw(&mut framebuf);
        // draw::draw_rgba(&mut frame, &framebuf).unwrap(); // A safe variant of draw_rgba_nocopy
        win.redraw();
        // sleeps are necessary when calling redraw in the event loop
        app::sleep(0.016);
    });

    app.run()?;
    Ok(())
}