[XeTeX] loading font

[Jonathan Kew]

On 25 Aug 2009, at 01:56, M. Niedermair wrote:

> Hi,
>
> i load a font with
>
> \setromanfont[Mapping=tex-text]{Linux Libertine O}
>
> Which fontparameter (fontname, familyname, weight, ...)  decides,  
> which font is loaded for bold (\textbf), italic (\textit), slanted  
> (\textsl), bold italic (\textbf{\textit), bold slanted  
> (\textbf{\textit)?

Assuming you have a whole collection of fonts with the family name  
"Linux Libertine O", the weight should be used to choose suitable  
faces for regular and bold, and if I recall correctly, the slant value  
is used to identify the italic/slanted variants. I don't think  
fontspec currently makes a distinction between \textit and \textsl  
(check with Will about this if necessary).

The automatic family setup is primarily intended for simple families  
with the 4 "standard" faces (regular, bold, italic, bold-italic),  
though it will generally do something reasonable for larger families.  
If the family has more than two weights, xetex will try to choose  
appropriate faces for "regular" and "bold" based on the weight  
property, but you may wish to override them (check the fontspec  
documentation for details) if you want precise control of the faces  
used.

JK