X Version 11 (Release 6.1)

XFontSetExtents(X3xlib)


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 XRectangle 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 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 change the string's extent by an amount other than that character's individual extent.

References

XCreateFontSet(X3xlib), XExtentsOfFontSet(X3xlib), XFontsOfFontSet(X3xlib)
Xlib - C Language X Interface


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