redhat man page for xfontsetextents

XFontSetExtents(3X11)						  XLIB FUNCTIONS					     XFontSetExtents(3X11)

NAME
       XFontSetExtents - XFontSetExtents structure

STRUCTURES
       The XFontSetExtents structure contains:

       typedef struct {
	    XRectangle max_ink_extent;
	    XRectangle max_logical_extent;
       } XFontSetExtents;

       The XRectangle structures used to return font set metrics are the usual Xlib screen-oriented rectangles 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 that 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 that 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 that 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 change the string's extent by an amount other than that
       character's individual extent.

SEE ALSO
       XCreateFontSet(3X11), XExtentsOfFontSet(3X11), XFontsOfFontSet(3X11)
       Xlib - C Language X Interface

X Version 11							    Release 6.6 					     XFontSetExtents(3X11)