func (display Display) SetBrightness(value float64) {
doWithBrightness(func(key *C.char) {
C.IODisplaySetFloatParameter(
C.CGDisplayIOServicePort(C.CGDirectDisplayID(display.id)),
C.kNilOptions,
C.CFStringCreateWithCString(nil, key, C.kCFStringEncodingMacRoman),
C.float(value))
})
}
func (display Display) Brightness() float64 {
value := C.float(0.0)
doWithBrightness(func(key *C.char) {
C.IODisplayGetFloatParameter(
C.CGDisplayIOServicePort(C.CGDirectDisplayID(display.id)),
C.kNilOptions,
C.CFStringCreateWithCString(nil, key, C.kCFStringEncodingMacRoman),
&value)
})
return float64(value)
}