[Fontconfig] How to block glyph fallback in a QT application?

[suzuki toshiya]

>> * proper characters showing but from the wrong font (= glyph fallback)
>
> Usually this is just the case, by the main problem is caused by ligatures.
> The historical texts used a lot of ligatures and it's quite confusing when they are split into separate characters.

Excuse me, could you describe more detail about the mechanism
how the ligatures in your document should be rendered?
The ligatures in your document are specified by PUA codepoint?
Or, the ligatures in your document are coded by standard character
codepoints and automatically converted to the special ligature
glyph by some OpenType feature?

Regards,
mpsuzuki

On 01/06/2014 11:46 PM, Janusz S. Bien wrote:
> Quote/Cytat - Raimund Steger <rs at mytum.de> (Mon 06 Jan 2014 02:51:29 PM CET):
> 
>> Hi,
>>
>> On Mon, January 6, 2014 07:13, Janusz S. Bien wrote:
>>> [...]
>>> incidentally selects an improper font, then fallback creates quite a
>>> mess.
>>
>> What kind of mess are you seeing --
>>
>> * empty squares showing (= no glyph fallback)
> 
> That's what I would like to have when the user selects a wrong font.
> 
>> * proper characters showing but from the wrong font (= glyph fallback)
> 
> Usually this is just the case, by the main problem is caused by ligatures.
> The historical texts used a lot of ligatures and it's quite confusing when they are split into separate characters.
> 
> Best regards
> 
> Janusz
>