subpixel rendering doesn't respect screen rotation

[roothorick]

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)

[Rafael de Pelegrini Soares (rafael-rps)]

I confirm that this still is an issue with ubuntu 14.04.

If I select RGBA for subpixel I get blurry fonts when the screen in inverted. This is not an issue if I select grayscale for subpixel.

I can run further tests if needed.

All the best.

[Nikolaus Waxweiler (madleser)]

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.

[Daniel van Vugt (vanvugt)]

Thank you for reporting this bug to Ubuntu.
Ubuntu 12.04 (precise) reached end-of-life on April 28, 2017.

See this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases

We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in.