Cogl.x11_onscreen_get_window_xid

function x11_onscreen_get_window_xid(onscreen: Cogl.Onscreen): Number(guint32) {
    // Gjs wrapper for cogl_x11_onscreen_get_window_xid()
}
  

Assuming you know the given onscreen framebuffer is based on an x11 window this queries the XID of that window. If Cogl.x11_onscreen_set_foreign_window_xid was previously called then it will return that same XID otherwise it will be the XID of a window Cogl created internally. If the window has not been allocated yet and a foreign xid has not been set then it's undefined what value will be returned.

It's undefined what this function does if called when not using an x11 based renderer.

Since 1.10