Path: utzoo!attcan!uunet!husc6!think!ames!ncar!boulder!stan!garya
From: garya@stan.com (Gary Aitken)
Newsgroups: comp.windows.x
Subject: Re: XFontStruct numbers useless?
Message-ID: <282@stan.com>
Date: 19 Nov 88 02:23:10 GMT
References: <281@stan.com> <8811181451.AA20578@EXPO.LCS.MIT.EDU>
Organization: Solbourne Computer Inc., Longmont, Co.
Lines: 33


My appologies, the required font information is there; my original question,
rephrased, is:

  How does one determine the size of a window to display an arbitrary
  string in a fixed width font, such that no characters will clip?

The answer, I believe, is:

    XFontStruct *fp ;
    over_x_left = max(abs(min(fp->min_bounds.lbearing,0)),0) ;
        /* max # pixels to left of bounding box occupied by any character */
    over_x_right = max(fp->max_bounds.rbearing-fp->max_bounds.width,0) ;
        /* max # pixels to right of bounding box occupied by any character */
    over_y_top = max(fp->max_bounds.ascent-fp->ascent,0) ;
        /* max # pixels above bounding box occupied by any character */
    over_y_bottom = max(fp->max_bounds.descent-fp->descent,0) ;
        /* max # pixels below bounding box occupied by any character */
    ascent = fp->max_bounds.ascent + over_y_top ;
    descent = fp->max_bounds.descent + over_y_bottom ;
    ht = ascent + descent ;
	width = over_x_left + n_char*fp->max_bounds.width + over_x_right ;

The origin for drawing is then:
	(over_x_left,ascent)
> 
>     Is there a reliable way to determine if interline whitespace is already
>     included in the font, and what it is?
> 
> Yes, get your fonts from a reliable source.

Does this imply we may assume that all fonts from MIT have interline spacing
included?