Function gtk_sys::gtk_style_render_icon

pub unsafe extern "C" fn gtk_style_render_icon(
    style: *mut GtkStyle, 
    source: *const GtkIconSource, 
    direction: GtkTextDirection, 
    state: GtkStateType, 
    size: GtkIconSize, 
    widget: *mut GtkWidget, 
    detail: *const c_char
) -> *mut GdkPixbuf