+typedef struct _tdm_func_voutput {
+ /**
+ * @brief Destroy a virtual output object of a backend module
+ * @param[in] voutput The voutput object
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @see voutput_create() function
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_destroy)(tdm_voutput *voutput);
+
+ /**
+ * @brief Set available modes of a virtual output object
+ * @param[in] voutput A voutput object
+ * @param[in] modes Modes of voutput
+ * @param[in] count A count of modes
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_set_available_mode)(tdm_voutput *voutput, const tdm_output_mode *modes, int count);
+
+ /**
+ * @brief Set physical size(mm) of a virtual output object
+ * @param[in] voutput A voutput object
+ * @param[in] mmwidth Width of voutput
+ * @param[in] mmheight Height of voutput
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_set_physical_size)(tdm_voutput *voutput, unsigned int mmwidth, unsigned int mmheight);
+
+ /**
+ * @brief Set connect status of a virtual output object
+ * @param[in] voutput A voutput object
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_connect)(tdm_voutput *voutput);
+
+ /**
+ * @brief Set disconnect status of a virtual output object
+ * @param[in] voutput A voutput object
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_disconnect)(tdm_voutput *voutput);
+
+ /**
+ * @brief Get output object from virtual output object
+ * @param[in] voutput A voutput object
+ * @param[out] error #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @return A tdm_output object
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_output *(*voutput_get_output)(tdm_voutput *voutput, tdm_error *error);
+
+ /**
+ * @brief Set a user commit function
+ * @param[in] voutput A voutput object
+ * @param[in] func A user voutput commit function
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ * If virtual output's output_commit is executed, call this voutput commit func.
+ */
+ tdm_error (*voutput_set_commit_func)(tdm_voutput *voutput, tdm_voutput_commit_handler commit_func);
+
+ /**
+ * @brief Notify commit done to backend
+ * @param[in] voutput A voutput object
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * A backend module doesn't need to implement this function if doesn't support virtual output.
+ */
+ tdm_error (*voutput_commit_done)(tdm_voutput *voutput);
+
+ void (*reserved1)(void);
+ void (*reserved2)(void);
+ void (*reserved3)(void);
+ void (*reserved4)(void);
+ void (*reserved5)(void);
+ void (*reserved6)(void);
+} tdm_func_voutput;