Function CGImageCreateCopyWithContentAverageLightLevel 

pub extern "C-unwind" fn CGImageCreateCopyWithContentAverageLightLevel(
    image: Option<&CGImage>,
    avll: c_float,
) -> Option<CFRetained<CGImage>>

👎Deprecated: renamed to CGImage::new_copy_with_content_average_light_level

Available on crate feature CGImage only.