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45 lines
1022 B
C
45 lines
1022 B
C
#include <X11/Xlib.h>
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#include <X11/extensions/Xrandr.h>
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#include <stdio.h>
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#include <stdlib.h>
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void test_and_fail(void *ptr, char *msg) {
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if (ptr == NULL) {
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fprintf(stderr, "Fatal error: %s\n", msg);
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exit(2);
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}
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}
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int rol4 (int x) {
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// Just rotate left by 1 bit
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int num = x & 0xf;
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int sh = num << 1;
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int overflow = (sh & 0x10) >> 4;
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return (sh & 0xf) | overflow;
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}
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int main (void) {
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Display *dpy = XOpenDisplay(NULL);
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test_and_fail(dpy, "Could not open display");
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int screen_number = XDefaultScreen(dpy);
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Window root = XRootWindow(dpy, screen_number);
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// TODO: Early check that RandR is supported by dpy
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Rotation current;
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Rotation all;
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all = XRRRotations(dpy, screen_number, ¤t);
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Rotation new = rol4(current);
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Time cfg_ts;
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Rotation cfg_rot;
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XRRScreenConfiguration *cfg = XRRGetScreenInfo(dpy, root);
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XRRSetScreenConfig(dpy, cfg, root, XRRConfigCurrentConfiguration(cfg, &cfg_rot), new, XRRConfigTimes(cfg, &cfg_ts));
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XRRFreeScreenConfigInfo(cfg);
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XCloseDisplay(dpy);
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return 0;
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}
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