Function style::color::mix::interpolate_premultiplied

fn interpolate_premultiplied(
    left: &[f32; 4],
    left_weight: f32,
    right: &[f32; 4],
    right_weight: f32,
    hue_index: Option<usize>,
    hue_interpolation: HueInterpolationMethod,
    outcomes: &[ComponentMixOutcome; 4]
) -> ([f32; 4], ColorFlags)