You should file the bug against rendering libraries and/or toolkits like
GTK, because FreeType only provides the facilities for horizontal and
vertical subpixel rendering, the rendering system has to keep track of
the screen orientation by itself.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to freetype in Ubuntu.
https://bugs.launchpad.net/bugs/983220

Title:
  subpixel rendering doesn't respect screen rotation

Status in freetype package in Ubuntu:
  New
Status in wayland package in Ubuntu:
  New

Bug description:
  1) Open gnome-terminal
  2) xrandr --output default --rotate inverted
  2) Open another gnome-terminal

  In both the original and the new terminal, text has red and blue
  "shadows" caused by subpixel rendering that doesn't match up to the
  inverted pixel layout resulting from the screen being flipped 180
  degrees.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libfreetype6 2.4.8-1ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
  Uname: Linux 3.2.0-23-generic x86_64
  NonfreeKernelModules: nvidia wl
  ApportVersion: 2.0.1-0ubuntu3
  Architecture: amd64
  Date: Mon Apr 16 11:34:06 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 
(20111129.1)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: freetype
  UpgradeStatus: No upgrade log present (probably fresh install)

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