Reference Manual - 1.0.1
IDirectFBFont   GetMaxAdvance

Get the maximum character width.

GetMaxAdvance (
	IDirectFBFont		*	thiz,
	int		*	ret_maxadvance
);

This is a somewhat dubious value. Not all fonts specify it correcly. It can give you an idea of the maximum expected width of a rendered string.
这是一个有些不确定的值。不是所有字体正确的指定它。它能给你一个在绘制字符串时最大的宽度。

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