[Bug 1590804] Re: fontconfig initialization spends most of its time parsing XML configuration files in /etc/fonts/conf.d/

[Alberto Aguirre]

>From the attached backtrace, It seems that Qt calls FcInitReinitialize
when populating its font database (a QGenericUnixFontDatabase instance
provided by Qtubuntu) - that explains why re-parses the conf files
everytime.

See
http://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/fontdatabases/fontconfig/qfontconfigdatabase.cpp?h=v5.4.1#n439


** Attachment added: "backtrace.txt"
   https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1590804/+attachment/4689148/+files/backtrace.txt

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https://bugs.launchpad.net/bugs/1590804

Title:
  fontconfig initialization spends most of its time parsing XML
  configuration files in /etc/fonts/conf.d/

Status in Canonical System Image:
  New
Status in fontconfig package in Ubuntu:
  New

Bug description:
  While profiling the startup of QML apps on the BQ E4.5 phone (armhf) I noticed that a significant amount of time (around 35ms) was spent solely on parsing the XML configuration files in /etc/fonts/conf.d/ 
  There seems to be around 40 files on Ubuntu Phone in that directory.

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