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#!/usr/bin/python3
# Licensed under the GNU GPLv3+
import math
import subprocess
from gi.repository import Gtk
def xrandr(args):
cmd = ['xrandr'] + args
return subprocess.check_output(cmd).decode('utf-8')
def get_connected_outputs():
for line in xrandr([]).splitlines():
if line.startswith(' '):
continue
words = line.split()
if words[1] == 'connected':
yield words[0]
def set_brightness_and_gamma(outputs, brightness, gamma):
args = []
for output in outputs:
args += ['--output', output,
'--brightness', str(brightness),
'--gamma', '{}:{}:{}'.format(gamma[0], gamma[1], gamma[2])]
print(' '.join(args))
xrandr(args)
def color_temperature_to_rgb(kelvin):
"""Adapted from tannerhelland.com/4435."""
temp = kelvin / 100.0;
if temp <= 66:
red = 255
green = temp
green = 99.4708025861 * math.log(green) - 161.1195681661
if temp <= 19:
blue = 0
else:
blue = temp-10
blue = 138.5177312231 * math.log(blue) - 305.0447927307
else:
red = temp - 60
red = 329.698727446 * math.pow(red, -0.1332047592)
green = temp - 60
green = 288.1221695283 * math.pow(green, -0.0755148492 )
blue = 255
def clamp(val):
if val < 0:
return 0
elif val > 255:
return 255
else:
return val
return [clamp(red), clamp(green), clamp(blue)]
def temperature_to_gamma(kelvin):
rgb = color_temperature_to_rgb(kelvin)
fac = sum(rgb) / 3
for i in range(3):
rgb[i] /= (fac)
return rgb
class MyWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="xrandr-slightly-fewer-tears")
self.set_default_size(640, -1)
self.box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, border_width=10)
self.add(self.box)
self.box.add(Gtk.Label('Brightness'))
self.brightness = self.add_hscale(20, 100)
self.brightness.set_value(80)
self.box.add(Gtk.Label('Temperature (K)'))
self.temperature = self.add_hscale(1000, 25000)
self.temperature.set_value(5500)
def add_hscale(self, min_val, max_val):
scale = Gtk.Scale(orientation=Gtk.Orientation.HORIZONTAL, digits=0)
scale.set_range(min_val, max_val)
scale.connect('value-changed', lambda _: self.update())
self.box.add(scale)
return scale
def update(self):
brightness = self.brightness.get_value() / 100.0
if brightness < 0.2:
brightness = 0.2
set_brightness_and_gamma(get_connected_outputs(),
brightness,
temperature_to_gamma(self.temperature.get_value()))
def main():
win = MyWindow()
win.connect("delete-event", Gtk.main_quit)
win.show_all()
Gtk.main()
if __name__ == '__main__':
main()
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