[Bug 1076190] New: Rendering of Unicode tie bars could be improved

bugzilla at redhat.com bugzilla at redhat.com
Thu Mar 13 18:16:46 UTC 2014


            Bug ID: 1076190
           Summary: Rendering of Unicode tie bars could be improved
           Product: Fedora
           Version: 20
         Component: liberation-fonts
          Severity: low
          Assignee: psatpute at redhat.com
          Reporter: rkaldari at wikimedia.org
        QA Contact: extras-qa at fedoraproject.org
                CC: fonts-bugs at lists.fedoraproject.org,
                    i18n-bugs at lists.fedoraproject.org,
                    petersen at redhat.com, psatpute at redhat.com

Created attachment 874108
  --> https://bugzilla.redhat.com/attachment.cgi?id=874108&action=edit
comparison between Liberation Sans and Helvetica

Description of problem:
The rendering of the two Unicode tie bar combining characters (U+035E and
U+035F) is not ideal. In particular the characters are quite short and far away
from the characters they are tying together. This makes it appear more like a
misplaced macron than a tie bar. The rendering in Liberation Sans appears to be
equivalent to that of Arial which has the same issues. The rendering in
Helvetica is better (see attachment 1).

In particular, because the under tie bar (U+035F) is so far away from the other
characters, it sometimes gets clipped when rendered, as it appears to fall
slightly outside of the bounding box for the line height (see attachment 2).

My suggestion would be to make the length of both tie bars slightly longer, and
to move both of them slightly closer to the characters they are intended to tie

Version-Release number of selected component (if applicable):
12-Mar-2014 (2.x)

How reproducible:

Steps to Reproduce:
1. Install latest Liberation Sans (and Helvetica if you want to compare)
2. Go to https://www.mediawiki.org/wiki/User:Kaldari/Font_test_2

Actual results:
Tie bars should be slightly longer and closer to the other characters.

Expected results:
Tie bar are quite short and far away.

Additional info:
See attachments for more info.

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