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CentOS 7.0 - man page for xfontsetextents (centos section 3)

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XFontSetExtents(3)			  XLIB FUNCTIONS		       XFontSetExtents(3)

       XFontSetExtents - XFontSetExtents structure

       The XFontSetExtents structure contains:

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

       The XRectangle structures used to return font set metrics are the usual Xlib screen-ori-
       ented rectangles with x, y giving the upper left corner, and width and height always posi-

       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 sur-
       rounding 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.

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

X Version 11				   libX11 1.6.0 		       XFontSetExtents(3)
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