[Fedora-i18n-bugs] [Bug 984230] New: Broken aliasing on small sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

            Bug ID: 984230
           Summary: Broken aliasing on small sizes since version 2.00
           Product: Fedora
           Version: 18
         Component: liberation-fonts
          Severity: medium
          Priority: unspecified
          Assignee: psatpute(a)redhat.com
          Reporter: gitne(a)excite.co.jp
        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

The pixel aliasing of glyphs, especially vertical lines/parts is broken since
version 2.00 on Windows (renderer). This applies to all Liberation Font types
when ClearType is off, i.e. with gray-scale anti-aliasing only. Version 2.00
has incurred aliasing for all font sizes. Version 2.00.1 fixed this by
disabling anti-aliasing for sizes < 14pt. Yet, vertical lines/parts and some
transitions from curves to lines are still rendered incorrectly or with
artifacts.

This may also apply to Fedora GNOME desktops, but it has been observed on
Windows first.

Although, I am not a font design specialist, I suppose that this problem exists
because version 2.00 is based on Google Crosscore fonts and hinting information
for small font sizes is missing.
This is a show stopper for software rendering Libration Fonts on pixel based
digital displays. Software packages like LibréOffice are also negatively
affected by this issue (although on displays only). Please resolve this issue
or revert verion 2.00 and later to beta status.


How to reproduce:
Windows XP/2003
Compare Liberation Fonts version 1.07 to version 2.00.1 for small font sizes <
14pt.

Windows Vista and later
Disable ClearType
Compare Liberation Fonts version 1.07 to version 2.00.1 for small font sizes <
14pt. Version 1.07 has been correctly hinted, hence is perfectly pixel aligned.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

Jacob Wisor <gitne(a)excite.co.jp&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Broken aliasing on small    |Broken aliasing on small
                   |sizes since version 2.00    |font sizes since version
                   |                            |2.00

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

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

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

--- Comment #1 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Thanks for reporting this.

How croscore work with respect to this issue? will be good if you can provide
some screenshots.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gitne(a)excite.co.jp
              Flags|                            |needinfo?(gitne(a)excite.co.j
                   |                            |p)

--- Comment #2 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Hi Jacob,

   will be very helpful if you can provide screenshot

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

Jacob Wisor <gitne(a)excite.co.jp&gt; changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Flags|needinfo?(gitne(a)excite.co.j |
                   |p)                          |



--- Comment #3 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782150
  --> https://bugzilla.redhat.com/attachment.cgi?id=782150&action=edit
Liberation Mono Regular 1.07.2

Note that all glyphs are properly pixel aligned and hinted.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #4 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782153
  --> https://bugzilla.redhat.com/attachment.cgi?id=782153&action=edit
Liberation Sans Regular 1.07.2

Note that all glyphs are properly pixel aligned and hinted.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #5 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782155
  --> https://bugzilla.redhat.com/attachment.cgi?id=782155&action=edit
Liberation Serif Regular 1.07.2

Note that all glyphs are properly pixel aligned and hinted.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #6 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782156
  --> https://bugzilla.redhat.com/attachment.cgi?id=782156&action=edit
Liberation Mono Regular 2.00.0

Note that small font sizes are rendered with gray-scale anti-aliasing, which is
wrong for sizes < 14pt. Vertical strokes are not pixel aligned. This apples for
all font sizes (wrong again). It is difficult to see whether hinting is
correct, but probably not, because as it seems version 2.00.1 just turns off
anti-aliasing for sizes < 14pt (compare to version 2.00.1).

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #7 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782157
  --> https://bugzilla.redhat.com/attachment.cgi?id=782157&action=edit
Liberation Sans Regular 2.00.0

Note that small font sizes are rendered with gray-scale anti-aliasing, which is
wrong for sizes < 14pt. Vertical strokes are not pixel aligned. This apples for
all font sizes (wrong again). It is difficult to see whether hinting is
correct, but probably not, because as it seems version 2.00.1 just turns off
anti-aliasing for sizes < 14pt (compare to version 2.00.1).

Do not get yourself confused by the file's wrong internal version number.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #8 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782159
  --> https://bugzilla.redhat.com/attachment.cgi?id=782159&action=edit
Liberation Serif Regular 2.00.0

Note that small font sizes are rendered with gray-scale anti-aliasing, which is
wrong for sizes < 14pt. Vertical strokes are not pixel aligned. This apples for
all font sizes (wrong again). It is difficult to see whether hinting is
correct, but probably not, because as it seems version 2.00.1 just turns off
anti-aliasing for sizes < 14pt (compare to version 2.00.1).

Do not get yourself confused by the file's wrong internal version number.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #9 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782161
  --> https://bugzilla.redhat.com/attachment.cgi?id=782161&action=edit
Liberation Mono Regular 2.00.1

Note that anti-aliasing is disabled for font sizes < 14pt, which is correct.
Though, hinting is missing. Font sizes >= 14pt are anti-aliased, but vertical
strokes or vertical glyph positioning is not pixel aligned (as in version
2.00.0).

Do not get yourself confused by the file's wrong internal version number.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #10 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782162
  --> https://bugzilla.redhat.com/attachment.cgi?id=782162&action=edit
Liberation Sans Regular 2.00.1

Note that anti-aliasing is disabled for font sizes < 14pt, which is correct.
Though, hinting is missing. Font sizes >= 14pt are anti-aliased, but vertical
strokes or vertical glyph positioning is not pixel aligned (as in version
2.00.0).

Do not get yourself confused by the file's wrong internal version number.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #11 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782167
  --> https://bugzilla.redhat.com/attachment.cgi?id=782167&action=edit
Liberation Serif Regular 2.00.1

Note that anti-aliasing is disabled for font sizes < 14pt, which is correct.
Though, hinting is missing. Font sizes >= 14pt are anti-aliased, but vertical
strokes or horizontal glyph positioning is not pixel aligned (as in version
2.00.0).

Do not get yourself confused by the file's wrong internal version number.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #12 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
>  Font sizes >= 14pt are anti-aliased, but vertical strokes or
> vertical glyph
>  positioning is not pixel aligned (as in version 2.00.0). 
I meant /horizontal/ glyph positioning, of course.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #13 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Rather than Liberation 2.00.1 images you have attached Liberation 1.07.2
images. But its fine i understood the problem.

Yes, hinting bytecode is major problem for shifting from Liberation 1.07.2 to
Liberation 2.00.0

We need to decide between hinting Vs Glyph coverage.

Fixing hinting bytecode of Liberation 2 does not looks feasible to me. But i
will see if with some configuration in GASP table if we can improve it bit
more.  

How about Croscore does it gives expected results At small sizes?  though i
will check this..

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #14 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
(In reply to Pravin Satpute from comment #13)
>  Rather than Liberation 2.00.1 images you have attached Liberation
> 1.07.2
>  images. But its fine i understood the problem. 
No, I have attached 1.07.2, 2.00.1, and 2.00.2. Please read the posted comments
more carefully. The internal file versioning has not been updated correctly.

The point is, that since version 2.00.0 Liberations Fonts are fatally messed
up. There are two problems left since version 2.00.2: Hinting and horizontal
positioning of glyphs. It may be that horizontal positioning may be actually
the only problem, so that when it is done correctly everything else will fall
in place. I cannot tell for sure, because I am not a font designer.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #15 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782839
  --> https://bugzilla.redhat.com/attachment.cgi?id=782839&action=edit
Google Croscore Arimo Regular 1.23

>  How about Croscore does it gives expected results At small sizes? 
> though i
>  will check this.. 
As one can see Google Croscore is no alternative either. Anti-aliasing is on by
default for font sizes < 14pt. Horizontal glyph positioning is not correct
either.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #16 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782840
  --> https://bugzilla.redhat.com/attachment.cgi?id=782840&action=edit
Google Croscore Cousine Regular 1.20

>  How about Croscore does it gives expected results At small sizes? 
> though i
>  will check this.. 
As one can see Google Croscore is no alternative either. Anti-aliasing is on by
default for font sizes < 14pt. Horizontal glyph positioning is not correct
either.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #17 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
Created attachment 782841
  --> https://bugzilla.redhat.com/attachment.cgi?id=782841&action=edit
Google Croscore Tinos Regular 1.23


>  How about Croscore does it gives expected results At small sizes? 
> though i
>  will check this.. 
As one can see Google Croscore is no alternative either. Anti-aliasing is on by
default for font sizes < 14pt. Horizontal glyph positioning is not correct
either.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230



--- Comment #18 from Fedora End Of Life <endoflife(a)fedoraproject.org&gt; ---
This message is a reminder that Fedora 18 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 18. 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 WONTFIX if it remains open with a Fedora 
'version' of '18'.

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 prior to Fedora 18's end of life.

Thank you for reporting this issue and we are sorry that we may not be 
able to fix it before Fedora 18 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 to Fedora 18's end of life.

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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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=984230

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|18                          |20



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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

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--- Comment #19 from Jacob Wisor <gitne(a)excite.co.jp&gt; ---
(In reply to Fedora End Of Life from comment #18)
>  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 prior to Fedora 18's end of life. 
Thank you for not letting this bug slide.

Anyway, are the any news to report on what kind of action and when it is going
to be taken to fix this problem?

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

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--- Comment #20 from Pravin Satpute <psatpute(a)redhat.com&gt; ---
Due to hinting incompatibility we shifted back to liberation 1.07 in Fedora. 

In long term we need to improve hinting instructions of Liberation 2 and as
said earlier that is big task.

Presently not sure when this will happen.

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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

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--- Comment #21 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
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 '20'.

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 20 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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[Fedora-i18n-bugs] [Bug 984230] Broken aliasing on small font sizes since version 2.00

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |CLOSED
         Resolution|---                         |EOL
        Last Closed|                            |2015-06-29 20:39:51



--- Comment #22 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
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.

Thank you for reporting this bug and we are sorry it could not be fixed.

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