On Sun, Dec 02, 2012 at 10:58:56AM +0100, Steve White wrote: > Hi all, > > I finally got something like Pablo's test working on my system. It doesn't > show much new. As had already been established, with the right ConTeXt > switches, OpenType features of kerning and ligatures work correctly with > FreeSerif. > > Find attached. If there's a better way to do this, please comment: I may > put some of this in the FreeFront usage notes. (Hm... I may tighten the > italic y a bit.) > > A question remains: Why does ConTeXt (like some other TeX derivatives that > use OpenType) not determine the OpenType script of runs of text from the > Unicode (or other encoding) character range? All other font layout systems > I know of do this. (Remember- a run of text in the OpenType sense is not > the same as the scope of a TeX environment, it is typically a word, > separated by white space or punctuation.)
Determining the script of a run of text is not that simple, take "english (ARABIC.)"; to which script should the parenthesis and the period be classified? (they have a "common" script property in Unicode and not assigned to any given script). Unicode annex #24 provides an algorithm for to handle this that an engine should implement: http://www.unicode.org/reports/tr24/ Regards, Khaled ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
