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