You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: os_x11.go
    path of file: ./repos/gdlv/vendor/gioui.org/app
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: Unlicense OR MIT

//go:build ((linux && !android) || freebsd || openbsd) && !nox1
    
func x11DetectUIScale(dpy *C.Display) float32 {
	// default fixed DPI value used in most desktop UI toolkits
	const defaultDesktopDPI = 96
	var scale float32 = 1.0

	// Get actual DPI from X resource Xft.dpi (set by GTK and Qt).
	// This value is entirely based on user preferences and conflates both
	// screen (UI) scaling and font scale.
	rms := C.XResourceManagerString(dpy)
	if rms != nil {
		db := C.XrmGetStringDatabase(rms)
		if db != nil {
			var (
				t *C.char
				v C.XrmValue
			)
			if C.XrmGetResource(db, (*C.char)(unsafe.Pointer(&[]byte("Xft.dpi\x00")[0])),
				(*C.char)(unsafe.Pointer(&[]byte("Xft.Dpi\x00")[0])), &t, &v) != C.False {
				if t != nil && C.GoString(t) == "String" {
					f, err := strconv.ParseFloat(C.GoString(v.addr), 32)
					if err == nil {
						scale = float32(f) / defaultDesktopDPI
					}
				}
			}
			C.XrmDestroyDatabase(db)
		}
	}

	return scale
}