Function blend

crates/opencode-tui/src/components/message_palette.rs:22–37

(foreground: Color, background: Color, num: u16, den: u16)

}

fn blend(foreground: Color, background: Color, num: u16, den: u16) -> Color {
    if den == 0 || num >= den {
        return foreground;
    }

    match (foreground, background) {
        (Color::Rgb(fr, fg, fb), Color::Rgb(br, bg, bb)) => {
            let inv = den - num;
            let r = ((u16::from(fr) * inv) + (u16::from(br) * num)) / den;
            let g = ((u16::from(fg) * inv) + (u16::from(bg) * num)) / den;
            let b = ((u16::from(fb) * inv) + (u16::from(bb) * num)) / den;
            Color::Rgb(r as u8, g as u8, b as u8)
        }
        _ => foreground,
    }
}