XIQueryPointer - get device pointer coordinates.

           The XIQueryPointer function returns the root window the
           device's pointer is logically on and the pointer coordinates
           relative to the root window's origin. If XIQueryPointer returns
           False, the pointer is not on the same screen as the specified
           window, and XIQueryPointer returns None to child_return and
           zero to win_x_return and win_y_return. If XIQueryPointer
           returns True, the pointer coordinates returned to win_x_return
           and win_y_return are relative to the origin of the specified
           window. In this case, XIQueryPointer returns the child that
           contains the pointer, if any, or else None to child_return.

           XIQueryPointer returns the current logical state of the buttons
           buttons_return. The keyboard paired with the master pointer is
           selected to obtain the data for modifiers_return and
           group_return.

           The mask field in buttons_return is dynamically allocated and
           must be freed by the caller.

           XIQueryPointer is identical to XQueryPointer but specifies the
           device explicitly.

           XIQueryPointer can generate a BadDevice and a BadWindow error.

           BadDevice
                  An invalid device was specified. The device does not
                  exist or is not a pointer device.

           BadWindow
                  A value for a Window argument does not name a defined
                  window.

       XIQueryPointer - get device pointer coordinates.

XQueryPointer(3)

                                                   09/05/2024                                  XIQUERYPOINTER(3)

       #include <X11/extensions/XInput2.h>

       Bool XIQueryPointer( Display *display,
                            int deviceid,
                            Window win,
                            Window *root_return,
                            Window *child_return,
                            double *root_x_return,
                            double *root_y_return,
                            double *win_x_return,
                            double *win_y_return,
                            XIButtonState *buttons_return,
                            XIModifierState *modifiers_return,
                            XIGroupState *group_return);

       buttons_return
              Returns the current button state.

       child_return
              Returns the child window that the pointer is located in,
              if any.

       deviceid
              Specifies the device to query.

       display
              Specifies the connection to the X server.

       group_return
              Returns the current group state.

       modifiers_return
              Returns the current state of the modifier keys.

       root_return
              Returns the root window that the pointer is in.

       root_x_return, root_y_return
              Return the pointer coordinates relative to the root
              window's origin.

       win
              Specifies the window.

       win_x_return, win_y_return
              Return the pointer coordinates relative to the specified
              window.