226638 - bad font rendering with anti aliased fonts

Status: RESOLVED DUPLICATE of bug 152671

(Firefox :: General, defect)

Description

[Kris Kelvin]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031007 Firebird/0.7
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031007 Firebird/0.7

Anti alised fonts like truetype or the luxi sans font shipping with my linux
distribution get rendered bad when scrolling up and down. It seems that the
text-line affected is the one that - before scrolling - was just at the upper or
lower border of the visible area. The wrong rendered line is looking like it is
missing one line of pixels and so being compressed vertically.

Reproducible: Always

Steps to Reproduce:
1. with truetype enabled in unix.js go to any text page
2. scroll up and down (i use smoothe scrolling but it is not mandatory)
3. watch effect of lines scrolling into center of window that had been at upper
or lower border of visible area

Actual Results:  
one line of pixels (or more?) is missing, line gets vertically compressed therefore

Expected Results:  
correct rendering of font

Comment 1

[Kris Kelvin]

It seems normal fonts are affected as well as i get the effect reading this
bug-report with adobe-courir-iso8859-1 as well, however i am not a font-expert.
please anyone try to reproduce this as it certanly is an anoying bug for me.

Comment 2

[snebeling]

Attachment: Correct vs. incorrect font rendering

I see this too (SuSE 9.0, KDE 3.1.4, Firebird 0.7, gtk2+xft build).

Comment 3

[Ali Ebrahim]

Are you running at 120dpi?

Comment 4

[Kris Kelvin]

$ xdpyinfo | grep resolution

gives me

resolution:    90x90 dots per inch

Firebird was set to take system settings

Comment 5

[Ali Ebrahim]

*** This bug has been marked as a duplicate of 152671 ***