Function ImPlot_ShowLegendEntries 

pub unsafe extern "C" fn ImPlot_ShowLegendEntries(
    items: *mut ImPlotItemGroup,
    legend_bb: ImRect,
    interactable: bool,
    pad: ImVec2,
    spacing: ImVec2,
    vertical: bool,
    DrawList: *mut ImDrawList,
) -> bool