pub unsafe extern "C" fn igDebugRenderViewportThumbnail(
draw_list: *mut ImDrawList,
viewport: *mut ImGuiViewportP,
bb: ImRect_c,
)pub unsafe extern "C" fn igDebugRenderViewportThumbnail(
draw_list: *mut ImDrawList,
viewport: *mut ImGuiViewportP,
bb: ImRect_c,
)