scripts

misc scripts and tools
git clone git://git.2f30.org/scripts.git
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commit 387c6cfcd97b2faeaa1e28096e0698bbc857293b
parent 2781ab32ce207523441cbe4ecce967f408c86217
Author: sin <sin@2f30.org>
Date:   Wed Nov 18 08:46:49 +0000

add sct - set color temperature by tedu

Diffstat:
sct.c | 84+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 84 insertions(+), 0 deletions(-)
diff --git a/sct.c b/sct.c @@ -0,0 +1,84 @@ +/* cc -std=c99 -O2 -I /usr/X11R6/include -o sct sct.c -L /usr/X11R6/lib -lm -lX11 -lXrandr */ +#include <stdio.h> +#include <X11/Xlib.h> +#include <X11/Xlibint.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); + } +} +