XFontSetExtents()XFontSetExtents()NameXFontSetExtents – 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 Xmb‐
TextExtents and XwcTextExtents for detailed semantics.
The max_logical_extent member gives the maximum extent, over all draw‐
able characters, of the rectangles which specify minimum spacing to
other graphical features, relative to a constant origin. Other graphi‐
cal features drawn by the client, for example, a border surrounding the
text, should not intersect this rectangle. The max_logical_extent mem‐
ber 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 AlsoXCreateFontSet(), XExtentsOfFontSet(), XFontsOfFontSet().
Xlib - Internationalized Text Output XFontSetExtents()
