scripts

various script and utils
git clone git://z3bra.org/scripts
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commit 6078f8fdacf1fe2350048d557a21f549fd156885
parent b8339904da2b7f4c4be81dc822d8ee879c66ab4f
Author: z3bra <willyatmailoodotorg>
Date:   Tue Nov 17 01:20:27 +0100

sct: set color temperature

Diffstat:
sct | 93+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 93 insertions(+), 0 deletions(-)
diff --git a/sct b/sct @@ -0,0 +1,93 @@ +#!/usr/bin/tcc -run -lm -lX11 -lXrandr + +/* + * A nifty little tool to set the color temp of the screen + * credits to http://www.tedunangst.com/flak/post/sct-set-color-temperature + * + * > Campfire style: sct 4500 + * > Dust storm on Mars style: sct 2000 + * > Coffee free all nighter style: sct 8000 + */ + +#include <stdio.h> +#include <X11/Xlib.h> +#include <X11/Xproto.h> +#include <X11/Xatom.h> +#include <X11/extensions/Xrandr.h> +#include <X11/extensions/Xrender.h> +#include <strings.h> +#include <string.h> +#include <stdlib.h> +#include <stdint.h> +#include <inttypes.h> +#include <stdarg.h> +#include <math.h> + + +/* cribbed from redshift, but truncated with 500K steps */ +static const struct { float r; float g; float b; } whitepoints[] = { + { 1.00000000, 0.18172716, 0.00000000, }, /* 1000K */ + { 1.00000000, 0.42322816, 0.00000000, }, + { 1.00000000, 0.54360078, 0.08679949, }, + { 1.00000000, 0.64373109, 0.28819679, }, + { 1.00000000, 0.71976951, 0.42860152, }, + { 1.00000000, 0.77987699, 0.54642268, }, + { 1.00000000, 0.82854786, 0.64816570, }, + { 1.00000000, 0.86860704, 0.73688797, }, + { 1.00000000, 0.90198230, 0.81465502, }, + { 1.00000000, 0.93853986, 0.88130458, }, + { 1.00000000, 0.97107439, 0.94305985, }, + { 1.00000000, 1.00000000, 1.00000000, }, /* 6500K */ + { 0.95160805, 0.96983355, 1.00000000, }, + { 0.91194747, 0.94470005, 1.00000000, }, + { 0.87906581, 0.92357340, 1.00000000, }, + { 0.85139976, 0.90559011, 1.00000000, }, + { 0.82782969, 0.89011714, 1.00000000, }, + { 0.80753191, 0.87667891, 1.00000000, }, + { 0.78988728, 0.86491137, 1.00000000, }, /* 10000K */ + { 0.77442176, 0.85453121, 1.00000000, }, +}; + +int +main(int argc, char **argv) +{ + Display *dpy = XOpenDisplay(NULL); + int screen = DefaultScreen(dpy); + Window root = RootWindow(dpy, screen); + + XRRScreenResources *res = XRRGetScreenResourcesCurrent(dpy, root); + + int temp = 6500; + if (argc > 1) + temp = atoi(argv[1]); + if (temp < 1000 || temp > 10000) + temp = 6500; + + temp -= 1000; + double ratio = temp % 500 / 500.0; +#define AVG(c) whitepoints[temp / 500].c * (1 - ratio) + whitepoints[temp / 500 + 1].c * ratio + double gammar = AVG(r); + double gammag = AVG(g); + double gammab = AVG(b); + + int num_crtcs = res->ncrtc; + for (int c = 0; c < res->ncrtc; c++) { + int crtcxid = res->crtcs[c]; + XRRCrtcInfo *crtc_info = XRRGetCrtcInfo(dpy, res, crtcxid); + + int size = XRRGetCrtcGammaSize(dpy, crtcxid); + + XRRCrtcGamma *crtc_gamma = XRRAllocGamma(size); + + for (int i = 0; i < size; i++) { + double g = 65535.0 * i / size; + crtc_gamma->red[i] = g * gammar; + crtc_gamma->green[i] = g * gammag; + crtc_gamma->blue[i] = g * gammab; + } + XRRSetCrtcGamma(dpy, crtcxid, crtc_gamma); + + XFree(crtc_gamma); + } +} +