Function QLPreviewRequestCreateContext 

pub unsafe extern "C-unwind" fn QLPreviewRequestCreateContext(
    preview: &QLPreviewRequest,
    size: CGSize,
    is_bitmap: bool,
    properties: Option<&CFDictionary>,
) -> Option<CFRetained<CGContext>>

👎Deprecated: renamed to QLPreviewRequest::context

Available on crate features QLGenerator and objc2-core-graphics only.