mirror of
https://repo.dec05eba.com/gpu-screen-recorder-ui
synced 2026-03-31 09:17:04 +09:00
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <X11/Xlib.h>
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#include <X11/keysym.h>
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static int ignore_xerror(Display *display, XErrorEvent *ee) {
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(void)display;
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(void)ee;
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return 0;
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}
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static void sigterm_handler(int dummy) {
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(void)dummy;
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}
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static const KeySym toggle_overlay_key = XK_Z;
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static void grab_keys(Display *display) {
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unsigned int numlockmask = 0;
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KeyCode numlock_keycode = XKeysymToKeycode(display, XK_Num_Lock);
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XModifierKeymap *modmap = XGetModifierMapping(display);
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for(int i = 0; i < 8; ++i) {
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for(int j = 0; j < modmap->max_keypermod; ++j) {
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if(modmap->modifiermap[i * modmap->max_keypermod + j] == numlock_keycode)
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numlockmask = (1 << i);
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}
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}
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XFreeModifiermap(modmap);
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XErrorHandler prev_error_handler = XSetErrorHandler(ignore_xerror);
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Window root_window = DefaultRootWindow(display);
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unsigned int modifiers[] = { 0, LockMask, numlockmask, numlockmask|LockMask };
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for(int i = 0; i < 4; ++i) {
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XGrabKey(display, XKeysymToKeycode(display, toggle_overlay_key), Mod1Mask|modifiers[i], root_window, False, GrabModeAsync, GrabModeAsync);
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}
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XSync(display, False);
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XSetErrorHandler(prev_error_handler);
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}
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static Window get_window_with_input_focus(Display *display) {
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Window window = None;
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int rev;
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if(!XGetInputFocus(display, &window, &rev))
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window = None;
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return window;
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}
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int main() {
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Display *display = XOpenDisplay(NULL);
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if(!display) {
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fprintf(stderr, "Error: XOpenDisplay failed\n");
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return 1;
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}
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grab_keys(display);
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const KeyCode overlay_keycode = XKeysymToKeycode(display, toggle_overlay_key);
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XSetErrorHandler(ignore_xerror);
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/* Killing gpu-screen-recorder with SIGTERM also gives us SIGTERM. We want to ignore that as that has no meaning here */
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signal(SIGTERM, sigterm_handler);
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XEvent xev;
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for(;;) {
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XNextEvent(display, &xev);
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if(xev.type == KeyRelease && xev.xkey.keycode == overlay_keycode) {
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Window window_with_input_focus = get_window_with_input_focus(display);
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if(window_with_input_focus && window_with_input_focus != DefaultRootWindow(display)) {
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char cmd[1024];
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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);
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system(cmd);
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}
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}
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}
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return 0;
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}
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