commit 387c6cfcd97b2faeaa1e28096e0698bbc857293b
parent 2781ab32ce207523441cbe4ecce967f408c86217
Author: sin <sin@2f30.org>
Date: Wed, 18 Nov 2015 08:46:49 +0000
add sct - set color temperature by tedu
Diffstat:
| A | 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);
+ }
+}
+
