Ubuntu
firefox-3.0 package

Overlapping characters in huge fonts

Bug #256464 reported by Алексей Капранов (Alex Kapranoff) on 2008-08-09

Affects		Status	Importance	Assigned to	Milestone
	Mozilla Firefox	Invalid	Medium	mozilla-bugs #449969
	firefox-3.0 (Ubuntu)	Fix Released	Undecided	Unassigned

Bug Description

Binary package hint: firefox-3.0

This is
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008072820 Firefox/3.0.1
on Ubuntu 8.04.1

Huge fonts are render in such a way that several starting characters from a line are drawn on the same place without any offset!

I made a simple page to demonstate the bug:
http://kapranoff.ru/~kappa/sizebug.html

The screenshot of this page displayed in my browser is attached.

Looks like fonts sized in a narrow corridor around 200px are affected.

ProblemType: Bug
Architecture: i386
Date: Sun Aug 10 00:32:04 2008
DistroRelease: Ubuntu 8.04
Package: firefox-3.0 3.0.1+build1+nobinonly-0ubuntu0.8.04.3
PackageArchitecture: i386
ProcEnviron:
PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
LANG=en_US.UTF-8
SHELL=/usr/bin/zsh
SourcePackage: firefox-3.0
Uname: Linux 2.6.24-20-generic i686

Tags:

Revision history for this message

Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

Screenshot-Mozilla Firefox.png Edit (163.3 KiB, image/png)
Dependencies.txt Edit (2.7 KiB, text/plain; charset="utf-8")
ExtensionSummary.txt Edit (4.4 KiB, text/plain; charset="utf-8")
pluginreg.dat.txt Edit (4.6 KiB, text/plain; charset="utf-8")
profiles.ini.txt Edit (232 bytes, text/plain; charset="utf-8")

Revision history for this message

guidol (monk-e) wrote on 2008-08-09:

Confirmed.

Distributor ID: Ubuntu
Description: Ubuntu 8.04.1
Release: 8.04
Codename: hardy

Linux vmubuntu 2.6.24-19-generic #1 SMP Fri Jul 11 23:41:49 UTC 2008 i686 GNU/Linux

firefox:
  Installed: 3.0.1+build1+nobinonly-0ubuntu0.8.04.3
  Candidate: 3.0.1+build1+nobinonly-0ubuntu0.8.04.3
  Version table:
*** 3.0.1+build1+nobinonly-0ubuntu0.8.04.3 0
        500 http://nl.archive.ubuntu.com hardy-updates/main Packages
        500 http://security.ubuntu.com hardy-security/main Packages
        100 /var/lib/dpkg/status
     3.0~b5+nobinonly-0ubuntu3 0
        500 http://nl.archive.ubuntu.com hardy/main Packages

Changed in firefox-3.0:
status:	New → Confirmed

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008072820 Firefox/3.0.1
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008072820 Firefox/3.0.1

Huge fonts are render in such a way that several starting characters from a line are drawn on the same place without any offset!

I made a simple page to demonstate the bug:
http://kapranoff.ru/~kappa/sizebug.html

The screenshot of this page displayed in my browser is attached.

Looks like fonts sized in a narrow corridor around 200px are affected.

Reproducible: Always

Steps to Reproduce:
1. Size a font via CSS property font-size to 200px

Actual Results:
Bad rendering

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

Created attachment 333108
Screenshot

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

The bug is also present in XUL pages.

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

I did two additional checks.

This bug is not due to some extensions -- I started with an empty profile.
This bug is not present on Windows XP.

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

Another check -- the bug IS present in Firefox 2.0.0.16 too.

Revision history for this message

Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

I did additional checks.

This bug is not due to some extensions -- I started with an empty profile.
This bug is not present on Windows XP.
This bug IS also present in Firefox 2.0.0.16 available in repositories.

Revision history for this message

In Mozilla Bugzilla #449969, Jesper Staun Hansen (jesper-staun-hansen-deactivatedaccount) wrote on 2008-08-09:

Bug is present in:
Linux version of Firefox 2.0.0.16 (ubuntu build)
Linux version of Firefox 3.0.1 (ubuntu build)
Linux version of Firefox 3.0.1 (Firefox official build)

Bug is not present in:
Windows version of Firefox 2.0.0.16
Windows version of Firefox 3.0.1

I noted that the errors between the official build and the ubuntu build are different.
Attachment in next message.

Revision history for this message

In Mozilla Bugzilla #449969, Jesper Staun Hansen (jesper-staun-hansen-deactivatedaccount) wrote on 2008-08-09:

#10

Created attachment 333111
Official firefox build showing a different error than ubuntu build

The image posted already looks like the ubuntu build error.
This image shows the official firefox build with a slightly different error.

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2008-08-09:

#11

Created attachment 333118
Overlapping fixed by selecting a part of the text

I noticed that the rendering is temporarily fixed if you select the right part of a line with your mouse. This is a screenshot. After clearing the selection (by clicking a mouse e.g.) the glitch returns.

Bug Watch Updater (bug-watch-updater) on 2008-08-10

Changed in firefox:
status:	Unknown → New

Revision history for this message

In Mozilla Bugzilla #449969, Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2009-03-05:

#12

I'm happy to announce that I don't see this bug any more in official Ubuntu 8.10 Firefox (3.0.6)!

Bug Watch Updater (bug-watch-updater) on 2009-03-06

Changed in firefox:
status:	New → Invalid

Revision history for this message

John Vivirito (gnomefreak) wrote on 2009-03-06:

#13

No longer confirmed. Are you still seeing this issue, the upstream bug reporter no longer sees this issue. can you please test with firefox-3.0.7 to make sure. It should be in Hardy Intrepid and Jaunty at this time

Changed in firefox-3.0:
status:	Confirmed → Incomplete

Revision history for this message

John Vivirito (gnomefreak) wrote on 2009-03-06:

#14

Nevermind it was you that it is fixed for. sorry didnt look closely at the name on this bug

Changed in firefox-3.0:
status:	Incomplete → Fix Released

Revision history for this message

Алексей Капранов (Alex Kapranoff) (kkapp) wrote on 2009-03-07:

#15

Still would nice to have someone else confirm that issue is fixed.

Revision history for this message

Alexander Sack (asac) wrote on 2009-03-07:

#16

I cannot reproduce this on jaunty with firefox 3.2 (trunk) and also not with firefox-3.0 from the ubuntu archive. I havent seen this, but from my side this seems fixed.

Bug Watch Updater (bug-watch-updater) on 2010-09-18