[Libreoffice-bugs] [Bug 112805] New: Support for "size" (optical size) OpenType table

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=112805

            Bug ID: 112805
           Summary: Support for "size" (optical size) OpenType table
           Product: LibreOffice
           Version: 5.4.1.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rgb.mldc at gmail.com

Created attachment 136670
  --> https://bugs.documentfoundation.org/attachment.cgi?id=136670&action=edit
Character properties for Coelacanth font

There are fonts like Latin Modern(1) or the still in development Coelacanth(2)
that offers "optical sizes"(3): variants of the font designed to be used for
different point sizes (broader, less detailed for small point sizes, taller and
with higher contrast for big headings). 

This feature is governed by the "size" OpenType table. Systems like XeTeX
automatically pick the right font file to be used on the appropriate size, but
it seems that LibreOffice gets confused by that table: not only it do not
switch between variants, it's not even possible to select which variant is
being used as you can see on the attached screenshot. In fact Coelacanth
consist of 37 font files tied together by the "size" OT feature, but LibO only
offers a small and rather arbitrary selection.

------
(1) http://www.gust.org.pl/projects/e-foundry/latin-modern/download
(2) https://github.com/Fuzzypeg/Coelacanth
(3) https://en.wikipedia.org/wiki/Font#Optical_size

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