Example #1
0
// setColorTemp changes the Xrandr colors to reflect the specified color temperature.
func setColorTemp(gammar, gammag, gammab float64) {
	dpy := C.XOpenDisplay(nil)
	screenCount := C.screenCount(dpy)
	for screen := C.int(0); screen < screenCount; screen++ {
		root := C.RootWindowMacro(dpy, screen)

		res := C.XRRGetScreenResourcesCurrent(dpy, root)

		for c := C.int(0); c < res.ncrtc; c++ {
			crtcxid := C.crtcxid(res.crtcs, c)

			size := C.XRRGetCrtcGammaSize(dpy, crtcxid)
			crtc_gamma := C.XRRAllocGamma(size)
			for i := C.int(0); i < size; i++ {
				g := 65535.0 * float64(i) / float64(size)
				C.ushortSet(C.ushortCast(unsafe.Pointer(crtc_gamma.red)), i, C.double(g*gammar))
				C.ushortSet(C.ushortCast(unsafe.Pointer(crtc_gamma.green)), i, C.double(g*gammag))
				C.ushortSet(C.ushortCast(unsafe.Pointer(crtc_gamma.blue)), i, C.double(g*gammab))
			}
			C.XRRSetCrtcGamma(dpy, crtcxid, crtc_gamma)
			C.XFree(unsafe.Pointer(crtc_gamma))
		}

		C.XFree(unsafe.Pointer(res))
	}
	C.XCloseDisplay(dpy)
}
Example #2
0
// SetColorTemp changes the Xrandr colors to reflect the specified color temperature.
func SetColorTemp(temp int) {
	dpy := C.XOpenDisplay(nil)
	screenCount := C.screenCount(dpy)
	for screen := C.int(0); screen < screenCount; screen++ {
		root := C.RootWindowMacro(dpy, screen)

		res := C.XRRGetScreenResourcesCurrent(dpy, root)

		if temp < 1000 || temp > 10000 {
			temp = 6500
		}
		temp -= 1000
		ratio := float64((temp-1000)%500) / 500.0
		point := whitepoints[temp/500]
		gammar := point.r*(1-ratio) + point.r*ratio
		gammag := point.g*(1-ratio) + point.g*ratio
		gammab := point.b*(1-ratio) + point.b*ratio

		for c := C.int(0); c < res.ncrtc; c++ {
			crtcxid := C.crtcxid(res.crtcs, c)

			size := C.XRRGetCrtcGammaSize(dpy, crtcxid)
			crtc_gamma := C.XRRAllocGamma(size)
			for i := C.int(0); i < size; i++ {
				g := 65535.0 * float64(i) / float64(size)
				C.ushortSet(crtc_gamma.red, i, C.ushort(g*gammar))
				C.ushortSet(crtc_gamma.green, i, C.ushort(g*gammag))
				C.ushortSet(crtc_gamma.blue, i, C.ushort(g*gammab))
			}
			C.XRRSetCrtcGamma(dpy, crtcxid, crtc_gamma)
			C.XFree(unsafe.Pointer(crtc_gamma))
		}
	}
}