+typedef struct _tdm_func_hwc {
+ /**
+ * @brief Create a new window on the given hwc.
+ * @param[in] hwc A hwc object
+ * @param[out] error #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @return A created window object
+ * @since 2.0.0
+ */
+ tdm_hwc_window *(*hwc_create_window)(tdm_hwc *hwc, tdm_error *error);
+
+ /**
+ * @brief Get video the supported format array for the hwc windows of a hwc object.
+ * @param[in] hwc A hwc object
+ * @param[out] formats The available format array
+ * @param[out] count The count of formats
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_get_video_supported_formats)(tdm_hwc *hwc, const tbm_format **formats,
+ int *count);
+ /**
+ * @brief Get the available video property array of a hwc object.
+ * @param[in] hwc A hwc object
+ * @param[out] props The available video property array
+ * @param[out] count The count of video properties
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_get_video_available_properties)(tdm_hwc *hwc, const tdm_prop **props,
+ int *count);
+
+ /**
+ * @brief Get the hwc capabilities
+ * @param[in] hwc A hwc object
+ * @param[out] capabilities A hwc hwc capability
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_get_capabilities)(tdm_hwc *hwc, tdm_hwc_capability *capabilities);
+
+ /**
+ * @brief Get the available property array of a hwc object.
+ * @param[in] hwc A hwc object
+ * @param[out] props The available property array
+ * @param[out] count The count of properties
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_get_available_properties)(tdm_hwc *hwc, const tdm_prop **props,
+ int *count);
+
+ /**
+ * @brief Get a target buffer queue
+ * @param[in] hwc A hwc object
+ * @param[out] error #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @return A buffer queue
+ * @since 2.0.0
+ */
+ tbm_surface_queue_h (*hwc_get_client_target_buffer_queue)(tdm_hwc *hwc,
+ tdm_error *error);
+
+ /**
+ * @brief Set the client(relative to the TDM) target buffer
+ * @details This function lets the backend know the target buffer.
+ * The target buffer contains the result of the gl composition with the
+ * tdm_hwc_windows which marked as TDM_HWC_WIN_COMPOSITION_CLIENT.
+ * @param[in] hwc A hwc object
+ * @param[in] target_buffer The new target buffer
+ * @param[in] damage The buffer damage region
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @since 2.0.0
+ */
+ tdm_error (*hwc_set_client_target_buffer)(tdm_hwc *hwc,
+ tbm_surface_h target_buffer,
+ tdm_region damage);
+
+ /**
+ * @brief Validate the hwc
+ * @details Instructs the backend to inspect all of the hw layer state and
+ * determine if there are any composition type changes necessary before
+ * presenting the hwc.
+ * @param[in] hwc A hwc object
+ * @param[in] composited_wnds the hwc window list which is visible.
+ * @param[in] num_wnds the number of the visible windows in the composited_wnds
+ * @param[out] num_types The number of composition type changes
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @remark
+ * The backend has to return the num_types when the assgined comopsite types of
+ * the tdm_hwc_windows in the composited_wnds. If the num_types is greater than
+ * 0, the cleint must get the changed composite types of the tdm_hwc_windows
+ * and change the comopsite types
+ * @since 2.0.0
+ */
+ tdm_error (*hwc_validate)(tdm_hwc *hwc, tdm_hwc_window **composited_wnds,
+ uint32_t num_wnds, uint32_t *num_types);
+
+ /**
+ * @brief Get changed composition types
+ * @details Retrieves the windows for which the backend requires a different
+ * composition types that had been set prior to the last call to tdm_hwc_validate().
+ * The client will either update its state with these types and call
+ * tdm_hwc_accept_validation, or will set new types and attempt to validate the
+ * display again. The number of elements returned must be the same as the
+ * value returned in num_types from the last call to tdm_hwc_validate().
+ * @param[in] hwc A hwc object
+ * @param[out] num_elements the number of hwc_windows
+ * @param[out] windows An array of windows
+ * @param[out] composition_types An array of composition types, each corresponding
+ * to an element of windows
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @since 2.0.0
+ */
+ tdm_error (*hwc_get_changed_composition_types)(tdm_hwc *hwc, uint32_t *num_elements,
+ tdm_hwc_window **hwc_window,
+ tdm_hwc_window_composition *composition_types);
+ /**
+ * @brief Accepts the validation required by the backend
+ * @details Accepts the validation required by the backend from the previous
+ * tdm_hwc_validate() and tdm_hwc_get_chaged_composition_types().
+ * @param[in] hwc A hwc object
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @since 2.0.0
+ */
+ tdm_error (*hwc_accept_validation)(tdm_hwc *hwc);
+
+ /**
+ * @brief Commit changes for a hwc object
+ * @param[in] hwc A hwc object
+ * @param[in] sync 0: asynchronous, 1:synchronous
+ * @param[in] user_data The user data
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @see hwc_set_commit_handler, tdm_hwc_commit_handler
+ * @remark
+ * When this function is called, a backend module @b SHOULD apply the all
+ * changes of the given hwc object to screen as well as the layer changes
+ * of this hwc.
+ * If this function returns TDM_ERROR_NONE, a backend module @b SHOULD call
+ * a user commit handler with the user data of this function after all
+ * changes of the given hwc object are applied.
+ */
+ tdm_error (*hwc_commit)(tdm_hwc *hwc, int sync, void *user_data);
+
+ /**
+ * @brief Set a user commit handler
+ * @param[in] hwc A hwc object
+ * @param[in] func A user commit handler
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_set_commit_handler)(tdm_hwc *hwc, tdm_hwc_commit_handler func);
+
+ /**
+ * @brief Set the property which has a given id on the hwc object.
+ * @param[in] hwc A hwc object
+ * @param[in] id The property id
+ * @param[in] value The value of the propery id
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_set_property)(tdm_hwc *hwc, uint32_t id, tdm_value value);
+
+ /**
+ * @brief Get the property which has a given id on the hwc object.
+ * @param[in] hwc A hwc object
+ * @param[in] id The property id
+ * @param[in] value The value of the propery id
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_get_property)(tdm_hwc *hwc, uint32_t id, tdm_value *value);
+} tdm_func_hwc;
+