[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

Johnny_M  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Depends on||89870
 Resolution|--- |WORKSFORME


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=89870
[Bug 89870] Unify text layout to use HarfBuzz on all platforms
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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

--- Comment #8 from Johnny_M  ---
Created attachment 129402
  --> https://bugs.documentfoundation.org/attachment.cgi?id=129402=edit
Crosextra and MS C fonts kerning example (LO 5.3.0.beta1 on Windows Vista,
32-bit)

Version: 5.3.0.0.beta1
Build-ID: 690f553ecb3efd19143acbf01f3af4e289e94536
CPU-Threads: 2; BS-Version: Windows 6.0; UI-Render: Standard; Layout-Engine:
neu;
Gebietsschema: de-DE (de_DE); Calc: group


Status after introduction of HarfBuzz on Windows (bug 89870): The behavior on
Windows is now equal to the one on Linux - see bug 102226 (kerning is always
on). Therefore, I'm closing this in favor or the latter.

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

--- Comment #7 from Johnny_M  ---
Note: The Windows-to-Linux difference might be explained by the platform
differences described in bug 89870 and other issues enumerated by its
implementer in
https://somefoobar.wordpress.com/2016/08/24/gsoc-project-comes-to-an-end/

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

Johnny_M  changed:

   What|Removed |Added

   Keywords||bibisectRequest, regression

--- Comment #6 from Johnny_M  ---
Sorry for indecisiveness, but from the user point of view it does look like a
regression: kerning works for Crosextra fonts in LO 5.0 (although always-on for
all fonts), but doesn't since LO 5.1. Or otherwise an "implementationError".
Anyway, a bibisect would be useful.

By the way, I've checked a longer Writer document using Carlito font and
justified alignment with hyphenation (for better line space usage) and the
difference between its line break occurrence on Linux and Windows is
significant. It accumulates, leading to headings being moved, resulting in
incorrect page numbering in the table of contents (although its links still
work).

With LO 5.0, the difference in line break occurrence between Linux and Windows
is much smaller (by factor 20, I guess).

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

--- Comment #5 from Johnny_M  ---
(In reply to Johnny_M from comment #4)
> [...] And the crosextra fonts seem to lack
> the necessary kerning information, which seems to be the issue here. [...]

But then, maybe there is a second, additional issue: That no automatic kerning
is applied for a font which lacks the manual kerning information? While kerning
is requested via character configuration.

(That is, if it's possible to detect for a font if it includes the kerning
information/tables. But then, what if a font provides that information only for
a subset - e.g. western, Cyrillic, but not Greek or other. I guess it would be
the responsibility of the font designer to use an "all or nothing" approach -
i.e., if including kerning information, then for all desired subsets, otherwise
not include anything at all, in which case the kerning could be done
automatically. I don't know much on the topic though.)

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

Johnny_M  changed:

   What|Removed |Added

   Keywords|regression  |

--- Comment #4 from Johnny_M  ---
Thank you very much for Thank you very much for your feedback!

I'm removing the "regression" keyword as I'm no longer sure that it is one. It
looks more like being due to a change from an always-on automatic kerning in LO
5.0 (like in bug 102226 on Linux) to the manual font-provided kerning in LO 5.1
(which is considered better). And the crosextra fonts seem to lack the
necessary kerning information, which seems to be the issue here.

That's just a guess based on information available so far.

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

V Stuart Foote  changed:

   What|Removed |Added

 Status|UNCONFIRMED |NEW
 CC||ke...@collabora.com,
   ||vstuart.fo...@utsa.edu
 Ever confirmed|0   |1

--- Comment #3 from V Stuart Foote  ---
Confirming the issue on Windows 8.1 Ent 64-bit en-US with
Version: 5.2.2.1 (x64)
Build ID: 3c2231d4aa4c68281f28ad35a100c092cff84f5d
CPU Threads: 8; OS Version: Windows 6.29; UI Render: GL; 
Locale: en-US (en_US); Calc: group

However, I believe the issue is with with font hinting and kerning--or lack
there of--for Carlito and Caladea on Windows as handled by the SimpleWinLayout
source in LibreOffice.

IIUC Google provided font mapping for fontconfig use with ChromeOS, which I
assume is packaged for use on Linux.

But is there similar font detail for use of the fonts on Windows?

There does not appear to be looking at the font with cr8software.net's Type
light 3.2--both Carlito and Caladea do not provide hinting or kerning in the
LibreOffice Windows packaging.

I checked the Microsoft deployed Calibri and Cambria fonts the same way with
Type light 3.2 and they both provide hinting and kerning--so not unexpected
that they are rendered differently than Carlito and Caladea.

Also, the Liberation Serif and Liberation Sans fonts packaged with LibreOffice
Windows builds are both provided with hinting and kerning for the fonts.

Not sure if this is a LibreOffice packaging issue, or is an issue with Google's
delivery of the Chromium OS Extra fonts.

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

Johnny_M  changed:

   What|Removed |Added

  Component|LibreOffice |graphics stack
 Blocks||71732


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=71732
[Bug 71732] [META] Bugs related to text rendering, typography and font features
in LO
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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

Johnny_M  changed:

   What|Removed |Added

   See Also||https://bugs.documentfounda
   ||tion.org/show_bug.cgi?id=10
   ||2226

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

--- Comment #2 from Johnny_M  ---
Note: The issue does not occur with MS's "Times New Roman" and "Arial" compared
to their metric compatible "Libreration Serif" and "Liberation Sans" (tested
with LO 5.2.1 on Vista). So that the issue seems to be specifically related to
the crosextra fonts. (Their misconfiguration of some sort?)

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[Libreoffice-bugs] [Bug 102224] Google crosextra fonts missing kerning - difference to MS C fonts ( and Windows to Linux)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=102224

--- Comment #1 from Johnny_M  ---
Created attachment 127362
  --> https://bugs.documentfoundation.org/attachment.cgi?id=127362=edit
Writer file used for the test

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