XmTextGetBaseline — A Text function that accesses the y position of the baseline "XmTextGetBaseline"

XmTextGetBaseline accesses the y position of the baseline in the Text widget, relative to the y  position
       of the top of the widget.

       In  vertical  mode  (when the XmNlayoutDirection resource is XmTOP_TO_BOTTOM) this function returns 0 and
       the program should use XmTextGetCenterlinewidget    Specifies the Text widget ID

       For a complete definition of Text and its associated resources, see XmText(3).

XmTextGetBaseline  —  A  Text  function  that accesses the y position of the baseline "XmTextGetBaseline"
       "Text functions" "XmTextGetBaseline"

XmText(3), XmTextGetCenterline(3).

                                                                                            XmTextGetBaseline(3)

       Returns an integer value that indicates the  y  position  of  the  baseline  in  the  Text  widget.   The
       calculation  takes into account the margin height, shadow thickness, highlight thickness, and font ascent
       of the first font (set) in the fontlist used for drawing text.  In this calculation, the  y  position  of
       the top of the widget is 0 (zero).

       #include <Xm/Text.h>
       intXmTextGetBaseline(
       Widgetwidget);