Am Thu, 23 Feb 2017 13:19:12 +0100 schrieb Hans Hagen: > On 2/23/2017 11:58 AM, Ulrike Fischer wrote: >> When using input like the following with xetex then harfbuzz kicks >> in and one would always get the good looking precomposed U+1EA0 for >> the A and the decomposed B+U+0323 for the B. >> >> With context (and lualatex) one get a rather bad looking -- as the >> dot is misplaced -- output for the A^^^^0323 input and no output at >> all for ^^^^1e04. >> >> As the coverage for precomposed glyphs varies a lot across fonts >> this is rather a nuisance. Is there a way to get the fontloader >> (also the one used by luaotfload) to do a similar substituation as >> done by harfbuzz? >> >> \starttext >> \catcode`\^= 7 >> Ạ A^^^^0323 %decomposed input -> U+1EA0 with xetex >> >> Ạ ^^^^1ea0 %precomposed input >> >> >> Ḅ B^^^^0323 %decomposed input >> >> ^^^^1e04 %precomposed input -> B+U+0323 with xetex >> >> >> \stoptext >> >> >> (I added the ^^-notation to avoid problems with copy&paste) > > In context one can enable a collapse (last week i found out that it was > off by default). > > Anyway, there are two issues here: > > (1) one can in the input stream collapse the dot accent and the other > character but of course an altered input might not be what one wants,
No changing the input is imho not a solution as the document fonts can have different coverage of the glyphs. Whatever is done must be font dependant. > (btw, I suppose that xetex can disable that on demand as from your > post I deduce that it's default behaviour and fighting defaults > is a pain). I don't think that one disable the behaviour in xetex, the internal harfbuzz library is doing it. There is imho no way to get a A+combining accent in a document. I agree that it would be neat to be able to disable it but on the whole: if I had only the choice between "the xetex-substituation" and the current luatex/context behaviour I would prefer the first. For normal documents it is preferable. Did you sent the second mail only for me for a reason or did you only forget to add the list? Imho this is interesting for others too. -- Ulrike Fischer http://www.troubleshooting-tex.de/ ___________________________________________________________________________________ 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://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________
