FS#4634 - bad rendering of accented characters

Attached to Project: Arch Linux
Opened by Not Important (pholie) - Sunday, 14 May 2006, 12:16 GMT
Task Type Bug Report
Category Packages: Current
Status Closed
Assigned To Jan de Groot (JGC)
Architecture not specified
Severity Low
Priority Normal
Reported Version 0.7.1 Noodle
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

I found out a very strange issue. On some webpages I noticed that some accents are displayed above another character than they should be. I am able to reproduce it in all browsers. Now I managed to narrow the problem to font Trebuchet MS, size 15 even in OpenOffice so it must be some font rendering problem. It may occur, however, with other fonts and fontsizes too. Can it be some fontconfig package problem or what?

Example screenshot and testing document in odt format:
http://img363.imageshack.us/img363/2015/badaccent39qx.png
http://www.pholie.com/a/klopu.odt
This task depends upon

Closed by  Jan de Groot (JGC)
Friday, 19 May 2006, 20:20 GMT
Reason for closing:  Fixed
Additional comments about closing:  Freetype2 had an update because of some overflows. I'm running 2.2.1 for a few days now, so it works ok. 2.2.x is binary compatible with 2.1.x, so this shouldn't cause regressions.
Comment by Not Important (pholie) - Monday, 15 May 2006, 20:09 GMT
I found another case while surfing web. It happens again with font Trebuchet MS, now font size 13 cursive. You can check it on this document: http://www.pholie.com/a/podla.odt The accent (or what it is) should be above "l" but it is above the empty space after "a". Really odd. I was able to reproduce it with this document in Ubuntu too, after I installed the font. I know it is made by Microsoft :) but I can't believe it is possible to made a font which displays different characters when you use different font size. I am persuaded it is caused by some font rendering library. Where to report it now, when I know it is not arch specific problem?
Comment by Jan de Groot (JGC) - Tuesday, 16 May 2006, 21:28 GMT
This is caused by the bytecode hinter in Freetype2. I couldn't reproduce the bad accents on the webpages until I enabled the bytecode interpreter (I turned it off via /etc/fonts/conf.d/). I was able to reproduce with OpenOffice, since that package has its own static compiled version of freetype2 and fontconfig, which doesn't listen to things in /etc/fonts/conf.d at all and has bytecode hinting enabled by default.
Comment by Jan de Groot (JGC) - Wednesday, 17 May 2006, 22:26 GMT
I just upgraded my system to Freetype 2.2.1, which contains fixes to the bytecode interpreter. We won't release 0.7.2 with freetype 2.2.x, since it breaks many things, so this is for after the 0.7.2 release.
Comment by Not Important (pholie) - Thursday, 18 May 2006, 11:00 GMT
Great news :)

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