pub unsafe extern "system" fn UpdateLayeredWindow(
    hwnd: HWND,
    hdcdst: HDC,
    pptdst: *const POINT,
    psize: *const SIZE,
    hdcsrc: HDC,
    pptsrc: *const POINT,
    crkey: COLORREF,
    pblend: *const BLENDFUNCTION,
    dwflags: UPDATE_LAYERED_WINDOW_FLAGS,
) -> BOOL