void user_dg_init_window(void **user, window *win)
The user must perform whatever initialization is necessary for processing later commands. This usually includes setting up the user's data structure for receiving and storing display data.
void **user | INOUT | Pointer to the user-defined data structure. |
window *win | INOUT |
USER_ERROR | Error. Ignored. |
USER_SUCCESS | The user successfully performed initialization. |