+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;
+
+/**
+ * @brief The window functions for a backend module.
+ * @since 2.0.0
+ */
+typedef struct _tdm_func_hwc_window {
+ /**
+ * @brief Destroys the given window.
+ * @param[in] window the pointer of the window to destroy
+ * @since 2.0.0
+ */
+ void (*hwc_window_destroy)(tdm_hwc_window *hwc_window);
+
+ /**
+ * @brief Acquire a buffer queue for the window object
+ * @details These buffers are used to composite by hardware a client content in
+ * the nocomp mode.
+ * @param[in] hwc_window A window object
+ * @param[out] error #TDM_ERROR_NONE if success. Otherwise, error value.
+ * @return A buffer queue
+ */
+ tbm_surface_queue_h (*hwc_window_acquire_buffer_queue)(tdm_hwc_window *hwc_window,
+ tdm_error *error);
+
+ /**
+ * @brief Release a buffer queue for the window object
+ * @details Release buffer queue when the client no longer uses buferrs of queue.
+ * @param[in] hwc_window A window object
+ * @param[in] A tbm buffer queue
+ */
+ void (*hwc_window_release_buffer_queue)(tdm_hwc_window *hwc_window,
+ tbm_surface_queue_h queue);
+
+ /**
+ * @brief Sets the desired composition type of the given window.
+ * @details During hwc_validate(), the backend may request changes to
+ * the composition types of any of the layers as described in the definition
+ * of tdm_hwc_window_composition_t above.
+ * @param[in] hwc_window A window object
+ * @param[in] composition_type The new composition type
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_composition_type)(tdm_hwc_window *hwc_window,
+ tdm_hwc_window_composition composition_type);
+
+ /**
+ * @brief Set the buffer damage
+ * @details Provides the region of the source buffer which has been modified
+ * since the last frame. This region does not need to be validated before
+ * calling hwc_commit().
+ * Once set through this function, the damage region remains the same until a
+ * subsequent call to this function.
+ * If damage.num_rects > 0, then it may be assumed that any portion of the source
+ * buffer not covered by one of the rects has not been modified this frame. If
+ * damage.num_rects == 0, then the whole source buffer must be treated as if it
+ * has been modified.
+ * If the layer's contents are not modified relative to the prior frame, damage
+ * will contain exactly one empty rect([0, 0, 0, 0]).
+ * The damage rects are relative to the pre-transformed buffer, and their origin
+ * is the top-left corner. They will not exceed the dimensions of the latched
+ * buffer.
+ * @param[in] hwc_window A window object
+ * @param[in] damage The new buffer damage region
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_buffer_damage)(tdm_hwc_window *hwc_window,
+ tdm_region damage);
+
+ /**
+ * @brief Set the information to a window object
+ * @details The information will be applied when the hwc object is committed.
+ * @param[in] hwc_window A window object
+ * @param[in] info The geometry information
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_info)(tdm_hwc_window *hwc_window,
+ tdm_hwc_window_info *info);
+
+ /**
+ * @brief Set a TDM buffer to a window object
+ * @details A TDM buffer will be applied when the hwc object
+ * of a layer object is committed.
+ * @param[in] hwc_window A window object
+ * @param[in] buffer A TBM buffer
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_buffer)(tdm_hwc_window *hwc_window,
+ tbm_surface_h buffer);
+
+ /**
+ * @brief Set the property which has a given id.
+ * @param[in] hwc_window A hwc window 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_window_set_property)(tdm_hwc_window *hwc_window,
+ uint32_t id, tdm_value value);
+
+ /**
+ * @brief Get the property which has a given id.
+ * @param[in] hwc_window A hwc window object
+ * @param[in] id The property id
+ * @param[out] value The value of the propery id
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_get_property)(tdm_hwc_window *hwc_window,
+ uint32_t id, tdm_value *value);
+
+ /**
+ * @brief Get the constraints of hwc_window
+ * @param[in] hwc_window A hwc window object
+ * @param[out] constraints The tdm_hwc_window_constraint types
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_get_constraints)(tdm_hwc_window *hwc_window,
+ int *constraints);
+
+ /**
+ * @brief Set the name of hwc_window
+ * @param[in] hwc_window A hwc window object
+ * @param[in] name of the hwc_window
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_name)(tdm_hwc_window *hwc_window,
+ const char *name);
+
+ /**
+ * @brief Get buffer flags of cursor hwc_window
+ * @param[in] hwc_window A hwc window object
+ * @param[in] width of the cursor image
+ * @param[in] height of the cursor image
+ * @param[in] stride of the cursor image
+ * @param[in] virtual address of the cursor image
+ * @return #TDM_ERROR_NONE if success. Otherwise, error value.
+ */
+ tdm_error (*hwc_window_set_cursor_image)(tdm_hwc_window *hwc_window,
+ int width, int height, int stride, void *ptr);
+} tdm_func_hwc_window;
+