wip

.gitignore

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+# Compiled sibs files
+sibs-build/
+compile_commands.json
+tests/sibs-build/
+tests/compile_commands.json

main.cpp

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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;
+}

project.conf

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+[package]
+name = "window-overlay"
+type = "executable"
+version = "0.1.0"
+platforms = ["posix"]
+
+[dependencies]
+x11 = ">=1"