Function CGShadingCreateAxialWithContentHeadroom 

pub extern "C-unwind" fn CGShadingCreateAxialWithContentHeadroom(
    headroom: c_float,
    space: Option<&CGColorSpace>,
    start: CGPoint,
    end: CGPoint,
    function: Option<&CGFunction>,
    extend_start: bool,
    extend_end: bool,
) -> Option<CFRetained<CGShading>>

👎Deprecated: renamed to CGShading::new_axial_with_content_headroom

Available on crate features CGColorSpace and CGFunction and CGShading only.