Qt has a process that determine their font fallback about each character(or string) at same script. In this process, font configuration is used to search most similar to font family that user want. So, i call QGuiApplicationPrivate::platformIntegration()->fontDatabase()->fallbacksForFamily(...) to see fallback list in Qt, However, why it is different from "fc-match" results in system(e.g. linux). To looked into fallback result in detail, I refered to "qfontcofingdatabase.cpp" in qfontconfigdatabase. Qt send a query with parameters FC_FAMILY, FC_LANG, FC_SLANT and FC_STYLEHINT. Then, I think that Qt fallback list is same with list of the result from a query 'fc-match :family="Lohit Malayalam":lang="ml":slant=0:stylehint=5' in system. How i get the same list of Qt and system font fallback?

Hi and welcome to devnet, That question being on the private and QPA part of Qt, I'd recommend posting it to the interest mailing list . You'll find there Qt's developers/maintainers. This forum is more user oriented.

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Qt font fallback rule from font configuration in system.

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Hana Cho

wrote on last edited by

#1

Qt has a process that determine their font fallback about each character(or string) at same script.
In this process, font configuration is used to search most similar to font family that user want.

So, i call QGuiApplicationPrivate::platformIntegration()->fontDatabase()->fallbacksForFamily(...) to see fallback list in Qt,
However, why it is different from "fc-match" results in system(e.g. linux).

To looked into fallback result in detail, I refered to "qfontcofingdatabase.cpp" in qfontconfigdatabase.
Qt send a query with parameters FC_FAMILY, FC_LANG, FC_SLANT and FC_STYLEHINT.

Then, I think that Qt fallback list is same with list of the result from a query 'fc-match :family="Lohit Malayalam":lang="ml":slant=0:stylehint=5' in system.

How i get the same list of Qt and system font fallback?
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SGaist
Lifetime Qt Champion
wrote on last edited by

#2

Hi and welcome to devnet,

That question being on the private and QPA part of Qt, I'd recommend posting it to the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.
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