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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <X11/Xlib.h>
#include <X11/cursorfont.h>
#include <unistd.h>
static int x11_error_handler(Display *dpy, XErrorEvent *ev) {
return 0;
}
static void usage() {
fprintf(stderr, "usage: window-overlay <window>\n");
exit(1);
}
static bool string_to_i64(const char *str, int64_t *result) {
errno = 0;
char *endptr = nullptr;
int64_t res = strtoll(str, &endptr, 0);
if(endptr == str || errno != 0)
return false;
*result = res;
return true;
}
int main(int argc, char **argv) {
if(argc != 2)
usage();
int64_t target_window;
if(!string_to_i64(argv[1], &target_window)) {
fprintf(stderr, "Error: invalid number '%s' was specific for window argument\n", argv[1]);
return 1;
}
XSetErrorHandler(x11_error_handler);
Display *display = XOpenDisplay(NULL);
if(!display) {
fprintf(stderr, "Error: XOpenDisplay failed\n");
return 1;
}
//const Window root_window = DefaultRootWindow(display);
const int screen = DefaultScreen(display);
XSetWindowAttributes attr;
attr.background_pixel = XWhitePixel(display, screen);
attr.override_redirect = True;
Window overlay_window = XCreateWindow(display, target_window, 0, 0, 256, 256, 0, DefaultDepth(display, screen), InputOutput, XDefaultVisual(display, screen), CWBackPixel|CWOverrideRedirect, &attr);
if(!overlay_window) {
fprintf(stderr, "Error: failed to create overlay window\n");
return 1;
}
Cursor default_cursor = XCreateFontCursor(display, XC_arrow);
XMapWindow(display, overlay_window);
XGrabPointer(display, overlay_window, True, ButtonPressMask|ButtonReleaseMask, GrabModeSync, GrabModeSync, None, default_cursor, CurrentTime);
sleep(3);
/*XEvent xev;
for(;;) {
XNextEvent(display, &xev);
}*/
return 0;
}
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