[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 Blocks||149361


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=149361
[Bug 149361] Add support for BSLN table for AAT fonts
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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 Blocks||149336


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=149336
[Bug 149336] Support aligning CJK texts with BASE table
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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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Mark Hung  changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |FIXED

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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--- Comment #31 from Commit Notification 
 ---
Mark Hung committed a patch related to this issue.
It has been pushed to "master":

https://git.libreoffice.org/core/commit/fb8eb0ad9c3a5957a6e131490a7a8c97e5353ba2

tdf#104930 aligning CTL text with hanging baseline.

It will be available in 7.4.0.

The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
https://wiki.documentfoundation.org/Testing_Daily_Builds

Affected users are encouraged to test the fix and report feedback.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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--- Comment #30 from Commit Notification 
 ---
Mark Hung committed a patch related to this issue.
It has been pushed to "master":

https://git.libreoffice.org/core/commit/5f92e8cf3da6b5f66b6ef23219fcc91d2ad7c754

tdf#104930 Implement TextMetric::GetHangingBaseline.

It will be available in 7.4.0.

The patch should be included in the daily builds available at
https://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
https://wiki.documentfoundation.org/Testing_Daily_Builds

Affected users are encouraged to test the fix and report feedback.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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Commit Notification  changed:

   What|Removed |Added

 Whiteboard||target:7.4.0

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--- Comment #29 from Volga  ---
It’s coming now in HarfBuzz version 2.6.0, so we can gain basic support for
this, i.e. implament basic text alignment with BASE table, additionaly, we can
add support for advanced control of this table, at least we can create new API
set into LibreOffice BASIC to make use of the table.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #28 from Volga  ---
(In reply to Elie Roux from comment #13)
> To support the BASE table in LO, the BASE table must first be exposed by
> Harfbuzz, it's not the case yet, but see
> 
> https://github.com/behdad/harfbuzz/issues/418
This is fixed, so we are able to fix if HarfBuzz released a new version.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #27 from Volga  ---
HarfBuzz is already got support in 2.1.1.
https://github.com/harfbuzz/harfbuzz/commit/b8a78ce201608e9ac6d7f77447b2bbef6f09e9ff

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

   See Also||https://github.com/harfbuzz
   ||/harfbuzz/issues/1345

--- Comment #26 from Volga  ---
Now we can focus on the following issue for this, HarfBuzz developers will
bring desired APIs for baseline.
https://github.com/harfbuzz/harfbuzz/issues/1345

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #25 from Elie Roux  ---
Sorry, an additional comment to make it crystal clear:

currently (even in the latest release or git version), harbuzz reads the BASE
table, but doesn't provide an API to provide the data. These are two different
things. Harbuzz 1.7.6 does *not* provide the API that is needed for this issue
to be worked on on the LO side.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #24 from Elie Roux  ---
I'm not sure what wasn't clear in my previous comment, but here an attempt to
clarify what the next steps are for this issue:

1. wait for harfbuzz to expose an API to get the BASE data for a font, in my
experience that will probably take a few months, maybe a few years (not because
it's complex, because it's super low priority)

2. use this new API to create some code to handle the BASE feature in LO

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

LibreTraining  changed:

   What|Removed |Added

 CC||libretraining.tutorials@gma
   ||il.com

--- Comment #23 from LibreTraining  ---
(In reply to Volga from comment #20)
> It’s coming in HB 1.7.6.

Harfbuzz 1.7.6 was released on 2018-03-07.
https://github.com/harfbuzz/harfbuzz/releases

So what is happening with this issue?

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #22 from Volga  ---
OK, so we waiting for new version if HarfBuzz get complete support.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #21 from Elie Roux  ---
Well, although it's really great news, I wouldn't be so optimistic: the review
of the code to read the BASE table is not finished yet, and nothing is exposed
to the public yet. The way to access the BASE feature needs to be through an
API, and there is no API yet, not even any clue about what it will be. I think
there will be at least a few month before a first draft of an API... and not
much one can do in the mean time...

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--- Comment #20 from Volga  ---
It’s coming in HB 1.7.6.

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 CC||a...@kagaku.xii.jp,
   ||mark...@gmail.com

--- Comment #19 from Volga  ---
HarfBuzz repository received a pull request recently:
https://github.com/harfbuzz/harfbuzz/pull/838
So we can waiting for new release to get support. but we need to know which new
APIs added before we can make use of.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #18 from Volga  ---
The usage of Tibetan hanging baseline can be found at
https://www.unicode.org/wg2/docs/n4851-TangutAdditions.pdf page 11.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Korrawit Pruegsanusak  changed:

   What|Removed |Added

 Attachment #131129|application/octet-stream|application/x-font-ttf
  mime type||

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Korrawit Pruegsanusak  changed:

   What|Removed |Added

 Attachment #129946|application/octet-stream|application/zip
  mime type||

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #17 from Volga  ---
This baseline can be used for aligning drop initials for several Indic scripts
as Devanagari, Bengali, Gujarati and similar. The W3C Working Draft Indic
Layout Requirements has instruction for such usage. If we get support for
'BASE' table, we can making implementation based on this.

https://www.w3.org/TR/ilreq/#h_initial_letter_styling

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #16 from Volga  ---
Here is a simple sample of the behavior of aligning text with Alphabetic
baseline and hanging baseline, especially if we get implementation based on
'BASE' table. 
http://tavmjong.free.fr/blog/wp-content/uploads/SYDNEY_2016/AlignIntroB-2FS.gif

This is found at Inkscape Planet.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #15 from Volga  ---
This baseline is also needed for drop caps styled layout for Devanagari,
Gurmukhi and similar. According W3C documentation Indic Layout Requirements,
this baseline should making drop initial letters aligned with first line. If we
get this support we should also improve drop layout for such scripts.

https://w3c.github.io/ilreq/#h_typical_drop_initial_usage_in_indic_scripts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 Blocks|89870   |
 Depends on||89870


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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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 Blocks|106527  |89870


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=89870
[Bug 89870] Unify text layout to use HarfBuzz on all platforms
https://bugs.documentfoundation.org/show_bug.cgi?id=106527
[Bug 106527] Completely support BASE table
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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Buovjaga  changed:

   What|Removed |Added

 CC||shanshandehongxing@outlook.
   ||com

--- Comment #14 from Buovjaga  ---
*** Bug 106527 has been marked as a duplicate of this bug. ***

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Volga  changed:

   What|Removed |Added

 Blocks||106527


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=106527
[Bug 106527] Support BASE table
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V Stuart Foote  changed:

   What|Removed |Added

 CC||vstuart.fo...@utsa.edu
   See Also||https://github.com/behdad/h
   ||arfbuzz/issues/418

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Khaled Hosny  changed:

   What|Removed |Added

 Blocks|89870   |


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 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #13 from Elie Roux  ---
Commenting the new "Blocks #89870" tag:

I don't really understand why this bug would block anything related to Harfbuzz
use, there's no code to support the BASE table in LO, independently of the
Layout Engine.

A few updates:

Apple products (Page, etc.) are supposed to handle the BASE table as well as
the 'bsln' feature for a long time, but it seems that the implementation is
buggy, there is an internal Apple bug report to fix it. (no idea of the delay)

To support the BASE table in LO, the BASE table must first be exposed by
Harfbuzz, it's not the case yet, but see

https://github.com/behdad/harfbuzz/issues/418

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Volga  changed:

   What|Removed |Added

 Blocks||89870


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 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #12 from Elie Roux  ---
I've just received a message from Office Consumer Service stating:

"
Microsoft currently supports 7 baseline tags, including "hang".
"

I'll try to find a way to test.

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--- Comment #11 from Elie Roux  ---
Created attachment 131129
  --> https://bugs.documentfoundation.org/attachment.cgi?id=131129=edit
NotoSansTibetan with hang BASE feature added

Modified version of NotoSansTibetan including the BASE table. An fea version of
the included BASE table is:

table BASE {
  HorizAxis.BaseTagList hang;
  HorizAxis.BaseScriptList
DFLT hang 1389,
tibt hang 1389;
} BASE;

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

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https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #10 from Elie Roux  ---
Khaled, before I send it to the OpenType list (my subscription is pending),
would you have a few moments to tell me what you think of

https://github.com/eroux/otf-base-hang-tibt/blob/master/proposed-algorithm.md

?

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--- Comment #9 from Elie Roux  ---
Thanks! I'll do that and keep you informed

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--- Comment #8 from Khaled Hosny  ---
I don’t have any personal contacts, but you might get some luck asking on the
OpenType mailing list (https://www.microsoft.com/typography/otspec/otlist.htm).

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--- Comment #7 from Elie Roux  ---
Thanks for your input Khaled, I agree that the behavior should be defined more
consensually for this to be implemented. I have some contacts at the Dzongkha
Development Commission (DDC) I can ask about what they think the most natural
result would be, but none at Microsoft or Adobe... Do you think you could
indicate me some persons to talk to about this issue? (maybe in a private mail?
you can find my address on https://github.com/eroux/) Thank you!

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Khaled Hosny  changed:

   What|Removed |Added

 Status|UNCONFIRMED |NEW
 Ever confirmed|0   |1
   Severity|normal  |enhancement

--- Comment #6 from Khaled Hosny  ---
It is a valid enhancement request, but I don’t know if it is practical or not.

There does not seem to be many applications that support BASE table (I couldn’t
find any actually, though I remember vaguely reading somewhere that some Adobe
products support “ideo” tag but not any other tag) and the spec
(https://www.microsoft.com/typography/otspec/base.htm) does not seem to be well
defined (as usual with OpenType). Taking the 3B example from the spec and
trying to apply it to the case here (assuming purely Tibetan text for the sake
of simplicity); the hanging baseline is 1500 and assuming a font with 1000 UPEM
that would be 15pt for 10pt text. All good so far, but the main use case here
is text with different font sizes, so from which font size do we get the
baseline value and based on what criteria? Taking it from each font size
separately means we will end up with different values and the original issue is
still unfixed. Now added different scripts on the same line to the mix and
things get wildly. The spec talks about the “dominant run” where everything is
relative to it, but nowhere it defines it.

Someone needs to figure this out and come with clear spec or at least some
other application that can be checked against in order to be able to implement
this.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Xisco Faulí  changed:

   What|Removed |Added

 CC||khaledho...@eglug.org,
   ||xiscofa...@libreoffice.org

--- Comment #5 from Xisco Faulí  ---
Adding Khaled Hosny for advice

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

Julien Nabet  changed:

   What|Removed |Added

 CC||serval2...@yahoo.fr

--- Comment #4 from Julien Nabet  ---
Created attachment 129954
  --> https://bugs.documentfoundation.org/attachment.cgi?id=129954=edit
screenshot

On pc Debian x86-64 with master sources updated tody, I could reproduce this.
But the result is slightly different.

Khaled: thought you might be interested in this one.

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #2 from Elie Roux  ---
Created attachment 129946
  --> https://bugs.documentfoundation.org/attachment.cgi?id=129946=edit
document with fonts showing the problem

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #3 from Elie Roux  ---
Note that the attachments show that with a baseline at 0, there is no
experience of the problem (hang is ignored, but LibreOffice seems to align
things correctly. But not all Tibetan fonts have a baseline at 0,
NotoSansTibetan doesn't for instance.

NotoSansTibetan doesn't use the "hang" feature, I've reported the bug on

https://github.com/googlei18n/noto-fonts/issues/814

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[Libreoffice-bugs] [Bug 104930] please handle 'hang' baseline feature of OpenType fonts

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=104930

--- Comment #1 from Elie Roux  ---
Created attachment 129945
  --> https://bugs.documentfoundation.org/attachment.cgi?id=129945=edit
image showing good/wrong result

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