hpux man page for xfontsetextents

XFontSetExtents()														 XFontSetExtents()

Name
  XFontSetExtents - XFontSetExtents structure.

Structures
  The XFontSetExtents structure contains:

     typedef struct {
	 XRectangle max_ink_extent;	 /*over all drawable characters*/
	 XRectangle max_logical_extent;  /*over all drawable characters*/
     } XFontSetExtents;

  The XRectangles used to return font set metrics are the usual Xlib screen-oriented XRectangles, with x, y giving the upper-left corner, and
  width and height always positive.

  The max_ink_extent member gives the maximum extent, over all drawable characters, of the rectangles which bound the character  glyph	image
  drawn in the foreground color, relative to a constant origin.  See XmbTextExtents and XwcTextExtents for detailed semantics.

  The  max_logical_extent  member  gives the maximum extent, over all drawable characters, of the rectangles which specify minimum spacing to
  other graphical features, relative to a constant origin.  Other graphical features drawn by the client, for example, a  border  surrounding
  the  text,  should not intersect this rectangle.  The max_logical_extent member should be used to compute minimum interline spacing and the
  minimum area which must be allowed in a text field to draw a given number of arbitrary characters.

  Due to context-dependent rendering, appending a given character to a string may increase the string's extent by an amount which exceeds the
  font's max extent:

     max possible added extent = (max_extent * <total # chars>) - prev_string_extent

See Also
  XCreateFontSet(), XExtentsOfFontSet(), XFontsOfFontSet().

Xlib - Internationalized Text Output												 XFontSetExtents()