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#[macro_use]
extern crate log;
extern crate spa;
use chrono::prelude::*;
use spa::{calc_solar_position, SunriseAndSet};
use std::os::raw::{c_ushort, c_void};
use std::ptr;
use x11::xlib::{XCloseDisplay, XDefaultScreen, XFree, XOpenDisplay, XRootWindow};
use x11::xrandr::{
XRRAllocGamma, XRRCrtcGamma, XRRGetCrtcGammaSize, XRRGetScreenResourcesCurrent, XRRSetCrtcGamma,
};
const LOW_TEMP: f64 = 3500f64;
const HIGH_TEMP: f64 = 5500f64;
const TRANSITION_LOW: f64 = -6.0;
const TRANSITION_HIGH: f64 = 3.0;
#[derive(Debug)]
pub struct WhitePoint {
pub red: f64,
pub green: f64,
pub blue: f64,
}
pub fn set_temp(temp: u32) {
let ratio: f64 = (temp % 500) as f64 / 500f64;
unsafe {
let display = XOpenDisplay(ptr::null_mut());
let screen = XDefaultScreen(display);
let root = XRootWindow(display, screen);
let resource = XRRGetScreenResourcesCurrent(display, root);
for x in 0..(*resource).ncrtc {
let crtcxid = (*resource).crtcs.offset(x as isize);
let size = XRRGetCrtcGammaSize(display, *crtcxid);
let crtc_gamma: *mut XRRCrtcGamma = XRRAllocGamma(size);
let gamma = avg(temp, ratio);
for i in 0..size {
let g = (65535f64 * i as f64) / size as f64;
*((*crtc_gamma).red as *mut c_ushort).offset(i as isize) = (g * gamma.red) as u16;
*((*crtc_gamma).green as *mut c_ushort).offset(i as isize) =
(g * gamma.green) as u16;
*((*crtc_gamma).blue as *mut c_ushort).offset(i as isize) = (g * gamma.blue) as u16;
}
XRRSetCrtcGamma(display, *crtcxid, crtc_gamma);
XFree(crtc_gamma as *mut c_void);
}
XCloseDisplay(display);
}
}
pub fn reset_temp() {
set_temp(HIGH_TEMP as u32);
}
fn get_transition_progress_from_elevation(elevation: f64) -> f64 {
if elevation < TRANSITION_LOW {
return 0.0;
} else if elevation < TRANSITION_HIGH {
(TRANSITION_LOW - elevation) / (TRANSITION_LOW - TRANSITION_HIGH)
} else {
return 1.0;
}
}
pub fn get_temp(utc: DateTime<Utc>, ss: &SunriseAndSet, lat: f64, lon: f64) -> f64 {
match *ss {
SunriseAndSet::Daylight(_, _) => {
let elevation = 90f64 - calc_solar_position(utc, lat, lon).unwrap().zenith_angle;
debug!("elevation: {}", elevation);
let progress = get_transition_progress_from_elevation(elevation);
LOW_TEMP + (progress * (HIGH_TEMP - LOW_TEMP))
}
SunriseAndSet::PolarDay => HIGH_TEMP,
SunriseAndSet::PolarNight => LOW_TEMP,
}
}
pub fn avg(temp: u32, ratio: f64) -> WhitePoint {
const WPS: [WhitePoint; 20] = [
WhitePoint {
red: 1.00000000,
green: 0.18172716,
blue: 0.00000000,
},
WhitePoint {
red: 1.00000000,
green: 0.42322816,
blue: 0.00000000,
},
WhitePoint {
red: 1.00000000,
green: 0.54360078,
blue: 0.08679949,
},
WhitePoint {
red: 1.00000000,
green: 0.64373109,
blue: 0.28819679,
},
WhitePoint {
red: 1.00000000,
green: 0.71976951,
blue: 0.42860152,
},
WhitePoint {
red: 1.00000000,
green: 0.77987699,
blue: 0.54642268,
},
WhitePoint {
red: 1.00000000,
green: 0.82854786,
blue: 0.64816570,
},
WhitePoint {
red: 1.00000000,
green: 0.86860704,
blue: 0.73688797,
},
WhitePoint {
red: 1.00000000,
green: 0.90198230,
blue: 0.81465502,
},
WhitePoint {
red: 1.00000000,
green: 0.93853986,
blue: 0.88130458,
},
WhitePoint {
red: 1.00000000,
green: 0.97107439,
blue: 0.94305985,
},
WhitePoint {
red: 1.00000000,
green: 1.00000000,
blue: 1.00000000,
},
WhitePoint {
red: 0.95160805,
green: 0.96983355,
blue: 1.00000000,
},
WhitePoint {
red: 0.91194747,
green: 0.94470005,
blue: 1.00000000,
},
WhitePoint {
red: 0.87906581,
green: 0.92357340,
blue: 1.00000000,
},
WhitePoint {
red: 0.85139976,
green: 0.90559011,
blue: 1.00000000,
},
WhitePoint {
red: 0.82782969,
green: 0.89011714,
blue: 1.00000000,
},
WhitePoint {
red: 0.80753191,
green: 0.87667891,
blue: 1.00000000,
},
WhitePoint {
red: 0.78988728,
green: 0.86491137,
blue: 1.00000000,
},
WhitePoint {
red: 0.77442176,
green: 0.85453121,
blue: 1.00000000,
},
];
WhitePoint {
red: WPS[(temp / 500) as usize].red * (1f64 - ratio)
+ WPS[(temp / 500 + 1) as usize].red * ratio,
green: WPS[(temp / 500) as usize].green * (1f64 - ratio)
+ WPS[(temp / 500 + 1) as usize].green * ratio,
blue: WPS[(temp / 500) as usize].blue * (1f64 - ratio)
+ WPS[(temp / 500 + 1) as usize].blue * ratio,
}
}
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