[Bug 334657] Re: Subpixel/Lcd mode with VRGB/VBGR makes qt4 applications on Jaunty unreadable

Fri Oct 27 07:04:41 UTC 2017

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On 2009-03-15T20:55:12+00:00 Adam wrote:

Created attachment 335275
Qt4 application with RGB subpixel

Description of problem:
When VRGB is selected in subpixel font smoothing options in Gnome, Qt4 applications display garbage instead of text.

Version-Release number of selected component (if applicable):
qt-4.5.0-3.fc11.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. Select VRGB.
2. Run psi or lmms.

Actual results:
Garbage fonts.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/12

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On 2009-03-15T20:55:45+00:00 Adam wrote:

Created attachment 335276
Qt4 application with VRGB subpixel

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/13

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On 2009-03-15T21:01:54+00:00 Kevin wrote:

Just to ask the obvious: you do have freetype-freeworld or some other
freetype build with subpixel antialiasing support, right?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/14

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On 2009-03-15T22:53:13+00:00 Rex wrote:

What X video driver are you using?

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/15

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On 2009-03-15T23:36:49+00:00 Adam wrote:

I do not have freetype-freeworld, this is the default Fedora 11
freetype. It DOES appear to have subpixel rendering: I can see it with
xmag.

I am using xorg-x11-drv-ati (r300 radeon, not using KMS).

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/16

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On 2009-03-16T00:00:44+00:00 Kevin wrote:

This is interesting, I just checked, subpixel antialiasing is disabled
in F9, but got reenabled in F10 and devel.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/17

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On 2009-04-11T07:42:04+00:00 Kevin wrote:

Behdad said enabling subpixel antialiasing in the Fedora freetype was a
mistake (because of patent issues), it's disabled again in current
Rawhide and there's also a new F10 freetype build with it disabled (but
I don't think it got pushed out). Still, Qt should not display garbage
with it...

This is also reproducible with Intel graphics according to:
https://www.redhat.com/archives/fedora-list/2009-April/msg01110.html

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/31

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On 2009-04-14T17:56:52+00:00 José wrote:

I was using an r300 with KMS as it can be seen here:
http://lists.fedoraproject.org/pipermail/fedora-kde/2009-February/001479.html

The fix was to remove the hinting:
http://lists.fedoraproject.org/pipermail/fedora-kde/2009-February/001624.html

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/33

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On 2009-04-14T18:28:24+00:00 Rex wrote:

Interesting, enabled full font hinting here in systemsettings, but I
(still) can't reproduce.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/34

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On 2009-04-14T18:32:35+00:00 Rex wrote:

nevermind, reading closer (sorry), missed the vrgb part.  Confirmed
universally broken here, regardless of hinting.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/35

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On 2009-04-14T18:42:43+00:00 Rex wrote:

confirmed to that vgbr is broken likewise.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/36

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On 2009-04-14T19:48:52+00:00 Rex wrote:

* Tue Apr 14 2009 Rex Dieter <rdieter at fedoraproject.org> - 4.5.0-14
- fix vrgb/vgbr corruption, disable QT_USE_FREETYPE_LCDFILTER (#490377)

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/37

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On 2009-04-15T18:02:23+00:00 Fedora wrote:

kdeutils-4.2.2-2.fc10, kdetoys-4.2.2-2.fc10, kdesdk-4.2.2-2.fc10, kdeplasma-addons-4.2.2-2.fc10, kdeedu-4.2.2-1.fc10, kdebase-runtime-4.2.2-3.fc10, kdebase-4.2.2-2.fc10, kdeartwork-4.2.2-3.fc10, kdeadmin-4.2.2-2.fc10, kdeaccessibility-4.2.2-1.fc10, sigen-0.1.1-1.fc10, qgit-2.2-4.fc10.1, psi-0.12.1-2.fc10, kde-plasma-weather-1.0.0-3.fc10, arora-0.6-1.fc10, kde-l10n-4.2.2-1.fc10, kdegraphics-4.2.2-3.fc10, kde-i18n-3.5.10-4.fc10, kdepimlibs-4.2.2-3.fc10, oxygen-icon-theme-4.2.2-1.fc10, kdebindings-4.2.2-2.fc10, kdepim-4.2.2-3.fc10, konq-plugins-4.2.2-1.fc10, kdemultimedia-4.2.2-2.fc10, kdenetwork-4.2.2-1.fc10, kdegames-4.2.2-6.fc10, kdelibs-4.2.2-5.fc10, qjackctl-0.3.3-3.fc10, qsynth-0.3.3-4.fc10, kdebase-workspace-4.2.2-3.fc10, qt-4.5.0-14.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update kdeutils kdetoys kdesdk kdeplasma-addons kdeedu kdebase-runtime kdebase kdeartwork kdeadmin kdeaccessibility sigen qgit psi kde-plasma-weather arora kde-l10n kdegraphics kde-i18n kdepimlibs oxygen-icon-theme kdebindings kdepim konq-plugins kdemultimedia kdenetwork kdegames kdelibs qjackctl qsynth kdebase-workspace qt'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-3389

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/38

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On 2009-04-17T18:05:36+00:00 Fedora wrote:

kdeutils-4.2.2-2.fc10, kdetoys-4.2.2-2.fc10, kdesdk-4.2.2-2.fc10, kdeplasma-addons-4.2.2-2.fc10, kdeedu-4.2.2-1.fc10, kdebase-4.2.2-2.fc10, kdeartwork-4.2.2-3.fc10, kdeadmin-4.2.2-2.fc10, kdeaccessibility-4.2.2-1.fc10, sigen-0.1.1-1.fc10, qgit-2.2-4.fc10.1, psi-0.12.1-2.fc10, kde-plasma-weather-1.0.0-3.fc10, arora-0.6-1.fc10, kde-l10n-4.2.2-1.fc10, kdegraphics-4.2.2-3.fc10, kde-i18n-3.5.10-4.fc10, kdepimlibs-4.2.2-3.fc10, oxygen-icon-theme-4.2.2-1.fc10, kdebindings-4.2.2-2.fc10, kdepim-4.2.2-3.fc10, konq-plugins-4.2.2-1.fc10, kdemultimedia-4.2.2-2.fc10, kdenetwork-4.2.2-1.fc10, kdegames-4.2.2-6.fc10, kdelibs-4.2.2-5.fc10, qjackctl-0.3.3-3.fc10, qsynth-0.3.3-4.fc10, kdebase-workspace-4.2.2-3.fc10, qt-4.5.0-14.fc10, kdebase-runtime-4.2.2-4.fc10 has been pushed to the Fedora 10 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update kdeutils kdetoys kdesdk kdeplasma-addons kdeedu kdebase kdeartwork kdeadmin kdeaccessibility sigen qgit psi kde-plasma-weather arora kde-l10n kdegraphics kde-i18n kdepimlibs oxygen-icon-theme kdebindings kdepim konq-plugins kdemultimedia kdenetwork kdegames kdelibs qjackctl qsynth kdebase-workspace qt kdebase-runtime'.  You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F10/FEDORA-2009-3389

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/39

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On 2009-04-22T01:05:45+00:00 Fedora wrote:

kdeutils-4.2.2-2.fc10, kdetoys-4.2.2-2.fc10, kdesdk-4.2.2-2.fc10,
kdeplasma-addons-4.2.2-2.fc10, kdeedu-4.2.2-1.fc10,
kdebase-4.2.2-2.fc10, kdeartwork-4.2.2-3.fc10, kdeadmin-4.2.2-2.fc10,
kdeaccessibility-4.2.2-1.fc10, sigen-0.1.1-1.fc10, qgit-2.2-4.fc10.1,
psi-0.12.1-2.fc10, kde-plasma-weather-1.0.0-3.fc10, arora-0.6-1.fc10,
kde-l10n-4.2.2-1.fc10, kdegraphics-4.2.2-3.fc10, kde-i18n-3.5.10-4.fc10,
kdepimlibs-4.2.2-3.fc10, oxygen-icon-theme-4.2.2-1.fc10,
kdebindings-4.2.2-2.fc10, kdepim-4.2.2-3.fc10, konq-
plugins-4.2.2-1.fc10, kdemultimedia-4.2.2-2.fc10,
kdenetwork-4.2.2-1.fc10, kdegames-4.2.2-6.fc10, kdebase-
workspace-4.2.2-3.fc10, qt-4.5.0-14.fc10, kdebase-runtime-4.2.2-4.fc10,
qjackctl-0.3.4-1.fc10, qsynth-0.3.3-6.fc10, kdelibs-4.2.2-7.fc10 has
been pushed to the Fedora 10 stable repository.  If problems still
persist, please make note of it in this bug report.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/44

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On 2009-04-25T17:27:23+00:00 Rex wrote:

fyi, freetype lcd_filter for vrgb/vgbr is fixed in qt-4.5.1.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/qt4-x11/+bug/334657/comments/53

** Changed in: qt4-x11 (Fedora)
   Importance: Unknown => Medium

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Title:
  Subpixel/Lcd mode with VRGB/VBGR makes qt4 applications on Jaunty
  unreadable

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