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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,
};
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 = crate::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);
}
}
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