Cthulhu is no longer a fork. Now it is a screen reader written in Golang.

tests/ocr_click_fixture.py

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+"""Private X11 window that reports physical OCR click events."""
+import json
+import sys
+
+from Xlib import X, Xatom, display
+
+
+connection = display.Display()
+screen = connection.screen()
+root = screen.root
+window = root.create_window(20, 20, 240, 140, 0, screen.root_depth,
+                            X.InputOutput, X.CopyFromParent,
+                            event_mask=X.ButtonPressMask | X.ButtonReleaseMask)
+window.map()
+root.change_property(connection.intern_atom("_NET_ACTIVE_WINDOW"), Xatom.WINDOW, 32, [window.id])
+window.set_input_focus(X.RevertToParent, X.CurrentTime)
+connection.sync()
+initial_pointer = root.query_pointer()
+print(json.dumps({"window": window.id, "width": screen.width_in_pixels,
+                  "height": screen.height_in_pixels,
+                  "pointer": [initial_pointer.root_x, initial_pointer.root_y]}), flush=True)
+for line in sys.stdin:
+    if line.strip() != "events":
+        break
+    connection.sync()
+    events = []
+    while connection.pending_events():
+        event = connection.next_event()
+        if event.type in (X.ButtonPress, X.ButtonRelease):
+            events.append({"pressed": event.type == X.ButtonPress,
+                           "button": event.detail, "x": event.root_x, "y": event.root_y})
+    pointer = root.query_pointer()
+    print(json.dumps({"events": events, "pointer": [pointer.root_x, pointer.root_y]}), flush=True)
+connection.close()