[Libreoffice-bugs] [Bug 114140] New: [ODF] Improve the kind embedded fonts are addressed in the file

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=114140

            Bug ID: 114140
           Summary: [ODF] Improve the kind embedded fonts are addressed in
                    the file
           Product: LibreOffice
           Version: 5.4.3.2 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: rb.henschel at t-online.de

Created attachment 138068
  --> https://bugs.documentfoundation.org/attachment.cgi?id=138068&action=edit
File generated by LibreOffice with embedded fonts

For describing and embedding this structure is used e.g. (see attached file)
<office:font-face-decls>
  <style:font-face style:name="Cambria" svg:font-family="Cambria"
style:font-family-generic="roman">
    <svg:font-face-src>
      <svg:font-face-uri xlink:href="Fonts/font3.ttf" xlink:type="simple">
        <svg:font-face-format svg:string="truetype"/>
      </svg:font-face-uri>
      <svg:font-face-uri xlink:href="Fonts/font4.ttf" xlink:type="simple">
        <svg:font-face-format svg:string="truetype"/>
      </svg:font-face-uri>
      <svg:font-face-uri xlink:href="Fonts/font5.ttf" xlink:type="simple">
        <svg:font-face-format svg:string="truetype"/>
      </svg:font-face-uri>
      <svg:font-face-uri xlink:href="Fonts/font6.ttf" xlink:type="simple">
        <svg:font-face-format svg:string="truetype"/>
      </svg:font-face-uri>
    </svg:font-face-src>
  </style:font-face>
</office:font-face-decls>

The files font3.ttf to font6.ttf contain the different font faces regular,
bold, italic and bold-italic.

The ODF schema allows several <svg:font-face-uri> child elements for a
<svg:font-face-src> element. The purpose of that feature is, that you can
include different formats of the same font, e.g. "truetype" or "opentype" or
"type-1". The format itself is then given in the <svg:font-face-format>
element.

This feature is miss-used here to include different fonts into one
<svg:font-face-src> element.

Problems with that:

The font descriptor attributes of the <style:font-face> element would allow a
very detailed description of the font, but that is here not possible, because
different fonts are in included. Consumers will not directly know, which font
is to be used for e.g. italic.

At the time the file is written LibreOffice knows the font characteristics. But
it does not save this information. So when opening the file, LibreOffice has to
do again a detection in the font files themselves to recreate this information.
That is avoidable effort.

Solution is to use for each font file its own <style:font-face> declaration.

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