The
XmbTextEscapement and XwcTextEscapement functions return the escapement
in pixels of the specified string as a value, using the fonts loaded for
the specified font set. The escapement is the distance in pixels in the
primary draw direction from the drawing origin to the origin of the next
character to be drawn, assuming that the rendering of the next character
is not dependent on the supplied string.
Regardless of the character rendering
order, the escapement is always positive.