gtk-tree-view-column-cell-size (column area)

column -- a gtk-tree-view-column object
area -- a gdk-rectangle with the area a cell in the column will be allocated, or nil

x-offset -- an integer with the x offset of a cell relative to area
y-offset -- an integer with the y offset of a cell relative to area
width -- an integer with the width needed to render a cell
height -- an integer with the height needed to render a cell

Obtains the width and height needed to render the column. This is used primarily by the tree view.