[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #28 from Pablo  ---
Can fonttools help?
https://github.com/fonttools/fonttools

A python library to create a static instance from a variable font:
https://fonttools.readthedocs.io/en/latest/varLib/instancer.html

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

phv  changed:

   What|Removed |Added

 CC||marco.bur...@outlook.com

--- Comment #27 from phv  ---
*** Bug 146577 has been marked as a duplicate of this bug. ***

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

V Stuart Foote  changed:

   What|Removed |Added

   See Also||https://bugs.documentfounda
   ||tion.org/show_bug.cgi?id=10
   ||3596

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #26 from Miklos Vajna  ---
I believe skia does not change much here: you are focusing on printing, PDF
export or EPUB export, none of these are affected by the GL -> skia/vulkan
change.

Skia still renders the same text layout harfbuzz produces and still works with
the Windows-specific APIs (directwrite, etc.) when it comes to the actual
fonts. See these changes:

https://gerrit.libreoffice.org/c/core/+/90582
https://gerrit.libreoffice.org/c/core/+/91968

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #25 from Volga  ---
I have noticed that Skia is now integrated as new graphics backend, so which
API would be help to work with this?

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #24 from Volga  ---
(In reply to V Stuart Foote from comment #7)
> Seems more likely the printing and export to PDF would be reworked for
> HB/FreeType and use of a skia back end rather than restamping as "static
> glyphs" and sub-setted fonts.
> 
> Lets let the devs decide...
Skia is now integrated into LibreOffice.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #23 from Volga  ---
(In reply to Khaled Hosny from comment #22)
> No, we don’t use HarfBuzz subsetter and it would require a considerable
> refactoring to be able to do so, and that PR does not support instantiating
> a variable font which is what we would need for PDF.

Oh I made misunderstand, so it's clear that HarfBuzz doesn't do this
conversion.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #22 from Khaled Hosny  ---
(In reply to Volga from comment #21)
> If HarfBuzz implement this feature it's possible to fix this bug.
> https://github.com/harfbuzz/harfbuzz/issues/1558

No, we don’t use HarfBuzz subsetter and it would require a considerable
refactoring to be able to do so, and that PR does not support instantiating a
variable font which is what we would need for PDF.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #21 from Volga  ---
If HarfBuzz implement this feature it's possible to fix this bug.
https://github.com/harfbuzz/harfbuzz/issues/1558

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #20 from Volga  ---
For Windows 10, if we are really need them to present in PDF files, we can
modify the preferences of some virtual printers like CutePDF and PDFCreator as
following steps: 

1. Open Settings from Start Menu, then click Devices -> Printers and Scanners,
then click one of these printers you want to use, and then click Manage,
finally. click Printing Preferences.
2. In the Printing Preferences dialog, click Advance button, then modify these
Advanced Options as below:
   TrueType Font: Download as SoftFont
   TrueType Font Download Option: Outline

Then the virtual printer would accept font variation instances, convert them,
and embedded into PDF file, this can be done as another workarounds.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #19 from Volga  ---
For Windows 10, if we are really need them to present in PDF files, we can
modify the preferences some virtual printers like CutePDF and PDFCreator as
following steps: 

1. Open Settings from Start Menu, then click Devices -> Printers and Scanners,
then click one of these printers you want to use, and then click Manage,
finally. click Printing Preferences.
2. In the Printing Preferences dialog, click Advance button, then modify these
Advanced Options as below:
   TrueType Font: Download as SoftFont
   TrueType Font Download Option: Outline

Then the virtual printer would accept font variation instances, convert them,
and embedded into PDF file, this can be done as another workarounds.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #18 from Volga  ---
This is still present in
Version: 6.4.0.0.alpha0+ (x64) 
Build ID: 11a1bdc5fa0312111ddf9c1b7779a114b97e361c 
CPU threads: 4; OS: Windows 10.0; UI render: default; VCL: win; 
TinderBox: Win-x86_64@42, Branch:master, Time: 2019-06-19_00:00:04 
Locale: zh-CN (zh_CN); UI-Language: en-US 
Calc: threaded

As a workaround, we have to use Microsoft Print to PDF on Windows 10.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

--- Comment #17 from Volga  ---
(In reply to Khaled Hosny from comment #11)
> We currently do not support variable fonts at all, any apparent support is
> accidental. For PDF generation we will definitely need to generate static
> instances of the fonts before embedded them in PDF files. Using Skia or
> pdfium or not does not change much, the static instances will need to be
> generated regardless (either by us or by the new printing backend if we ever
> have a new one).
> 
Does HarfBuzz able to do such subsetting right now? If so there would be small
amount of works to implement it.

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[Libreoffice-bugs] [Bug 108497] Converting OpenType Font Variation instances before printing and exporting to PDF or EPUB

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=108497

Volga  changed:

   What|Removed |Added

Summary|Converting OpenType Font|Converting OpenType Font
   |Variation instances before  |Variation instances before
   |printing and exporting to   |printing and exporting to
   |PDF |PDF or EPUB

--- Comment #16 from Volga  ---
I think this should also works for EPUB expert, because many EPUB readers does
not support variable fonts, althrough they can load embedded fonts.

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