Function CGContextDrawLinearGradient 

pub extern "C-unwind" fn CGContextDrawLinearGradient(
    c: Option<&CGContext>,
    gradient: Option<&CGGradient>,
    start_point: CGPoint,
    end_point: CGPoint,
    options: CGGradientDrawingOptions,
)

👎Deprecated: renamed to CGContext::draw_linear_gradient

Available on crate features CGContext and CGGradient only.