[Bug 1834206] Re: fc-match -v reports rgba:1 instead of rgba:2 with BGR display

[Sebastien Bacher]

Thank you for your bug report, it might be worth reporting upstream on
https://gitlab.freedesktop.org/fontconfig/fontconfig/issues

** Changed in: fontconfig (Ubuntu)
   Importance: Undecided => Low

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Title:
  fc-match -v reports rgba:1 instead of rgba:2 with BGR display

Status in fontconfig package in Ubuntu:
  New

Bug description:
  I have a BGR display so I really would like to have BGR subpixel
  rendering. I'm having major trouble getting fc-match to emit correct
  info.

  $ fc-match -v | grep -E 'rgba|lcdfilter|antialias|hintstyle|dpi'
  	antialias: True(w)
  	hintstyle: 2(i)(w)
  	dpi: 75(f)(s)
  	rgba: 1(i)(w)
  	lcdfilter: 1(i)(w)

  $ ls -l /etc/fonts/conf.d/10*
  lrwxrwxrwx 1 root root 31 2016-08-16 22:18 /etc/fonts/conf.d/10-antialias.conf -> ../conf.avail/10-antialias.conf
  lrwxrwxrwx 1 root root 30 2019-06-14 12:27 /etc/fonts/conf.d/10-autohint.conf -> ../conf.avail/10-autohint.conf
  lrwxrwxrwx 1 root root 29 2016-08-16 22:18 /etc/fonts/conf.d/10-hinting.conf -> ../conf.avail/10-hinting.conf
  lrwxrwxrwx 1 root root 36 2016-08-16 22:18 /etc/fonts/conf.d/10-hinting-slight.conf -> ../conf.avail/10-hinting-slight.conf
  lrwxrwxrwx 1 root root 40 2016-08-16 22:18 /etc/fonts/conf.d/10-scale-bitmap-fonts.conf -> ../conf.avail/10-scale-bitmap-fonts.conf
  lrwxrwxrwx 1 root root 35 2019-06-13 12:16 /etc/fonts/conf.d/10-sub-pixel-bgr.conf -> ../conf.avail/10-sub-pixel-bgr.conf

  $ strace -e trace=file fc-match -v 2>&1 | grep "open.*bgr"
  open("/etc/fonts/conf.d/10-sub-pixel-bgr.conf", O_RDONLY|O_CLOEXEC) = 5

  $ gsettings list-recursively | grep bgr
  com.canonical.unity-greeter xft-rgba 'bgr'
  org.cinnamon.settings-daemon.plugins.xsettings rgba-order 'bgr'
  org.gnome.settings-daemon.plugins.xsettings rgba-order 'bgr'
  org.cinnamon.settings-daemon.plugins.xsettings rgba-order 'bgr'
  org.gnome.settings-daemon.plugins.xsettings rgba-order 'bgr'
  org.mate.font-rendering rgba-order 'bgr'

  Is there some documented reason that fc-match fails to report correct
  subpixel order given this config? Is there some another configuration
  file that I must modify or create to get fc-match to correctly declare
  BGR subpixel structure?

  Also, the dpi above is incorrect too, the correct value would be near
  96.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: fontconfig 2.11.94-0ubuntu1.1
  ProcVersionSignature: Ubuntu 4.15.0-51.55~16.04.1-lowlatency 4.15.18
  Uname: Linux 4.15.0-51-lowlatency x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Tue Jun 25 16:50:15 2019
  InstallationDate: Installed on 2015-02-23 (1583 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  SourcePackage: fontconfig
  UpgradeStatus: Upgraded to xenial on 2016-06-10 (1110 days ago)

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