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X Version 11 (Release 5)

XFontSetExtents(XS)


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 inter-line 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(XS), XExtentsOfFontSet(XS), XFontsOfFontSet(XS)
Xlib - C Language X Interface
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003