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Re: otf ligature rendering support?

From: Yuri D'Elia
Subject: Re: otf ligature rendering support?
Date: Fri, 02 Jan 2015 17:00:31 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.3.0

On 01/02/2015 04:45 PM, Eli Zaretskii wrote:
>> PragmataPro supports ligatures for a good set of common operators. This
>> makes it much less troublesome than "prettify-symbols-mode" since
>> indentation/spacing is not changed.
>> How would I enable the proper GSUB feature in emacs? Are ligatures
>> supported at all?
>> I can specify otf parameters in `font-spec', but the following:
>> (set-fontset-font nil 'latin
>>                (font-spec :family "PragmataPro"
>>                           :otf '(latn nil (liga))))
>> Doesn't really show any ligatures (or any other otf feature).
>> Am I doing something wrong?
> I think you need to define rules for composing characters into
> ligatures, in order to have what you want.

This is different than composition of unicode ligatures.
OTF ligatures are an inherent property of the font along with kerning

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