From 900553e6c0120edaf90fa8d28f34bd82af4c5a58 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 30 Mar 2022 19:14:30 +0200
Subject: Add daemon

---
 gpu-screen-recorder-overlay-daemon/main.c | 68 +++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 gpu-screen-recorder-overlay-daemon/main.c

(limited to 'gpu-screen-recorder-overlay-daemon/main.c')

diff --git a/gpu-screen-recorder-overlay-daemon/main.c b/gpu-screen-recorder-overlay-daemon/main.c
new file mode 100644
index 0000000..197d411
--- /dev/null
+++ b/gpu-screen-recorder-overlay-daemon/main.c
@@ -0,0 +1,68 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/keysym.h>
+
+static int xerror_dummy(Display *dpy, XErrorEvent *ee) {
+    (void)dpy;
+    (void)ee;
+    return 0;
+}
+
+static const KeySym toggle_overlay_key = XK_Z;
+static void grab_keys(Display *display) {
+    unsigned int numlockmask = 0; 
+    KeyCode numlock_keycode = XKeysymToKeycode(display, XK_Num_Lock);
+    XModifierKeymap *modmap = XGetModifierMapping(display);
+    for(int i = 0; i < 8; ++i) {
+        for(int j = 0; j < modmap->max_keypermod; ++j) {
+            if(modmap->modifiermap[i * modmap->max_keypermod + j] == numlock_keycode)
+                numlockmask = (1 << i); 
+        }
+    }   
+    XFreeModifiermap(modmap);
+
+    XErrorHandler prev_error_handler = XSetErrorHandler(xerror_dummy);
+    
+    Window root_window = DefaultRootWindow(display);
+    unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
+    for(int i = 0; i < 4; ++i) {
+        XGrabKey(display, XKeysymToKeycode(display, toggle_overlay_key), Mod1Mask|modifiers[i], root_window, False, GrabModeAsync, GrabModeAsync);
+    }    
+    
+    XSync(display, False);
+    XSetErrorHandler(prev_error_handler);
+}
+
+static Window get_window_with_input_focus(Display *display) {
+    Window window = None;
+    int rev;
+    if(!XGetInputFocus(display, &window, &rev))
+        window = None;
+    return window;
+}
+
+int main() {
+    Display *display = XOpenDisplay(NULL);
+    if(!display) {
+        fprintf(stderr, "Error: XOpenDisplay failed\n");
+        return 1;
+    }
+
+    grab_keys(display);
+    const KeyCode overlay_keycode = XKeysymToKeycode(display, toggle_overlay_key);
+
+    XEvent xev;
+    for(;;) {
+        XNextEvent(display, &xev);
+        if(xev.type == KeyRelease && xev.xkey.keycode == overlay_keycode) {
+            Window window_with_input_focus = get_window_with_input_focus(display);
+            if(window_with_input_focus && window_with_input_focus != DefaultRootWindow(display)) {
+                char cmd[1024];
+                snprintf(cmd, sizeof(cmd), "/home/dec05eba/git/gpu-screen-recorder-overlay/sibs-build/linux_x86_64/debug/gpu-screen-recorder-overlay %ld", window_with_input_focus);
+                system(cmd);
+            }
+        }
+    }
+    return 0;
+}
-- 
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