Bug 881051 - hinting regression with liberation sans
Summary: hinting regression with liberation sans
Keywords:
Status: CLOSED DUPLICATE of bug 856239
Alias: None
Product: Fedora
Classification: Fedora
Component: liberation-fonts
Version: 18
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Pravin Satpute
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-11-28 14:09 UTC by Pierre Ossman
Modified: 2012-12-06 19:07 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-12-06 19:07:36 UTC


Attachments (Terms of Use)
example of bad hinting (24.40 KB, image/png)
2012-11-28 14:09 UTC, Pierre Ossman
no flags Details

Description Pierre Ossman 2012-11-28 14:09:59 UTC
Created attachment 653557 [details]
example of bad hinting

Upgraded to F18 beta today, and all of a sudden everything looks like shit in Firefox. After some investigation, it turns out that hinting for Liberation Sans seems to be utterly broken.

See comparison screen shot from Firefox on F17 and F18.

Also tried forcing Liberation Sans in Epiphany, which rendered the same (i.e. badly).

Comment 1 Pravin Satpute 2012-11-28 14:16:41 UTC
Thanks for reporting this issue. We are going to discuss in tomorrow i18n meeting whether to revert back liberation 2.0 fonts. Will update it here.

Comment 2 Ilya 2012-11-28 14:47:13 UTC
Possible duplicate:

https://bugzilla.redhat.com/show_bug.cgi?id=856239

Comment 3 Ilya 2012-11-28 14:53:22 UTC
Another screenshot:

http://storage1.static.itmages.ru/i/12/1109/h_1352416963_1081608_4a4c6af4c4.png

Some issues noticesed:

* In the right picture some single vertical lines take several pixels while similar lines in other letters (or other parts of the same letter like in Russian ш in the word шрифтов or the П letter) occupy 1 pixel. It is incorrect that one vertical line in П is thicker than the other.
This unevenness creates an effect of blots spread through the text. 

* Due to subpixel smoothing this also creates an "rainbow" effect with colorful (reddish) play while the text in the text in the left window looks evenly black (in the both examples the subpixel smoothing is on).

* Some thick letters in the right window fuse such as letters "ым" in the word "лицензированными".

* The broken hinting also makes the lower part of the "в" letter to appear smaller than the upper part (look at the word "шрифтов"). This is incorrect behavior.

Comment 4 Pravin Satpute 2012-12-06 19:07:36 UTC

*** This bug has been marked as a duplicate of bug 856239 ***


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