[XeTeX] How to use ligatures for TTF fonts?

[Jonathan Kew]

On 30 Jan 2009, at 19:10, Mi CHEN wrote:

> Hi, JK
>
> How to customize the tex-text mapping? Thanks!
>
> Though I always turned this option on while using fontspec, but I'v  
> no idea how to use a customized version...
>

You'll need to find the source file tex-text.map (probably in your  
texmf tree at fonts/misc/xetex/fontmapping/base), make a copy with a  
new name, and add the mapping rules you want, following the pattern of  
those already there. Then use the tool teckit_compile to compile this  
into a binary .tec file that xetex can use. Install this in your  
personal texmf tree under fonts/misc/, similarly to the standard  
mapping provided with the distribution, and load it with the  
Mapping=.... option of fontspec.

(The mappings are handled by the TECkit system; see http://scripts.sil.org/teckit 
  for more detail.)

JK