pango:layout-width (layout)

layout -- a pango:layout object
width -- an integer for the desired width in Pango units, or -1 to indicate that no wrapping or ellipsization should be performed

The pango:layout-width function gets the width to which the lines of the Pango layout should wrap or ellipsized. The (setf pango:layout-width) function sets the width. The default value is -1 for no width is set.