draw_state::preset::blend::INVERT

pub const INVERT: Blend = Blend {
        color: BlendChannel {
            equation: Equation::Sub,
            source: Factor::ZeroPlus(BlendValue::ConstColor),
            destination: Factor::ZeroPlus(BlendValue::SourceColor),
        },
        alpha: BlendChannel {
            equation: Equation::Add,
            source: Factor::Zero,
            destination: Factor::One,
        },
    }

When combining two fragments, subtract the destination color from a constant color using the source color as weight. Has an invert effect with the constant color as base and source color controlling displacement from the base color. A white source color and a white value results in plain invert. The output alpha is same as destination alpha.