the GtkCellAreaContext used to hold sizes for area.
the GtkWidget that area is rendering on
the whole allocated area for area in widget for this row
the x position
the y position
where to store the inner allocated area of the returned cell renderer, or NULL. out[allow-none]
the GtkCellRenderer at x and y. [transfer none] Since 3.0
Gets the GtkCellRenderer at x and y coordinates inside area and optionally returns the full cell allocation for it inside cell_area.