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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

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

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

How reproducible:
Always

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #1 from Ryan Kaldari <rkaldari(a)wikimedia.org&gt; ---
Created attachment 874118
  --> https://bugzilla.redhat.com/attachment.cgi?id=874118&action=edit
screenshot showing clipping

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #2 from Ryan Kaldari <rkaldari(a)wikimedia.org&gt; ---
By the way, if you adjust the tie bar characters, you may want to look at the
other tie characters at the same time to make sure they are all visually
consistant:

Rendered:
a͜a a͝a a͞a a͟a a͠a a͡a

HTML:
a&#x35C;a a&#x35D;a a&#x35E;a a&#x35F;a a&#x360;a a&#x361;a

Unicode:
U+035C U+035D U+035E U+035F U+0360 U+0361

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |i18n
             Status|NEW                         |ASSIGNED



--- Comment #3 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Agree with you !!
We just need to make sure fixing this does not create any kind of regression.

I will fix this.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #4 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
In this example you have mentioned only about 

"a U+035e a" , how about "a U+035e b"?  same applies for f, d

Existing position of uni035F works fine even with a͞b

How helvetica rendering it?

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rkaldari(a)wikimedia.org
              Flags|                            |needinfo?(rkaldari@wikimedi
                   |                            |a.org)



--- Comment #5 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Unfortunately i dont have helvetica font with me.

1. Your "attachment 1" is not opening at my end. Please attach it again.
2. Give me screenshot about how Helvetica handling a͞b and a͟g 

If possible provide me link to get Helvetica.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Ryan Kaldari <rkaldari(a)wikimedia.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|needinfo?(rkaldari@wikimedi |
                   |a.org)                      |



--- Comment #6 from Ryan Kaldari <rkaldari(a)wikimedia.org&gt; ---
Created attachment 888126
  --> https://bugzilla.redhat.com/attachment.cgi?id=888126&action=edit
comparison with more characters

I've attached a new screenshot showing the combinations requested.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #7 from Ryan Kaldari <rkaldari(a)wikimedia.org&gt; ---
I case you can't open that attachment for some reason...

Helvetica is rendering a͞b and a͟g the same as Liberation Sans except for the
horizontal position. In other words, it crosses the b and g, which is fine I
think.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #8 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
I tried to fix this in
http://pravins.fedorapeople.org/LiberationSans-Regular.ttf and
http://pravins.fedorapeople.org/LiberationSans-Bold.ttf


Issue after this fix is.
1. For low width characters like "i", "j", "l"  tie bar will
get merged with
previous letter.

Please test this and let me know if this work fine. Presently only improved for
latin small case letters "a-z"

Do give some reference from helvetica if issues.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #9 from Ryan Kaldari <rkaldari(a)wikimedia.org&gt; ---
This looks great. Nice work!

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #10 from Fedora End Of Life <endoflife(a)fedoraproject.org&gt; ---
This message is a reminder that Fedora 20 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 20. It is Fedora's policy to close all
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[Bug 1076190] Rendering of Unicode tie bars could be improved

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Fedora End Of Life <endoflife(a)fedoraproject.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |CLOSED
         Resolution|---                         |EOL
        Last Closed|                            |2015-06-29 20:57:08



--- Comment #11 from Fedora End Of Life <endoflife(a)fedoraproject.org&gt; ---
Fedora 20 changed to end-of-life (EOL) status on 2015-06-23. Fedora 20 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
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bug.

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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|CLOSED                      |ASSIGNED
            Version|20                          |23
         Resolution|EOL                         |---
           Keywords|                            |Reopened



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

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1076190



--- Comment #12 from Fedora End Of Life <jkurik(a)fedoraproject.org&gt; ---
This message is a reminder that Fedora 23 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 23. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '23'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not 
able to fix it before Fedora 23 is end of life. If you would still like 
to see this bug fixed and are able to reproduce it against a later version 
of Fedora, you are encouraged  change the 'version' to a later Fedora 
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events. Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

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

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https://bugzilla.redhat.com/show_bug.cgi?id=1076190

Pravin Satpute <psatpute(a)redhat.com&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|23                          |25



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--- Comment #13 from Fedora End Of Life <jkurik(a)fedoraproject.org&gt; ---
This message is a reminder that Fedora 25 is nearing its end of life.
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and issuing updates for Fedora 25. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as EOL if it remains open with a Fedora  'version'
of '25'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version.

Thank you for reporting this issue and we are sorry that we were not
able to fix it before Fedora 25 is end of life. If you would still like
to see this bug fixed and are able to reproduce it against a later version
of Fedora, you are encouraged  change the 'version' to a later Fedora
version prior this bug is closed as described in the policy above.

Although we aim to fix as many bugs as possible during every release's
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more recent Fedora release includes newer upstream software that fixes
bugs or makes them obsolete.

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

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Fedora End Of Life <jkurik(a)fedoraproject.org&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |CLOSED
         Resolution|---                         |EOL
        Last Closed|2015-06-29 20:57:08         |2017-12-12 05:22:06



--- Comment #14 from Fedora End Of Life <jkurik(a)fedoraproject.org&gt; ---
Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
bug.

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