[okular] [Bug 506403] New: Commenting on MS Windows embeds huge Segoi Emoji font, increasing file size by > 6 MB.

[Klaus]

https://bugs.kde.org/show_bug.cgi?id=506403

            Bug ID: 506403
           Summary: Commenting on MS Windows embeds huge Segoi Emoji font,
                    increasing file size by > 6 MB.
    Classification: Applications
           Product: okular
      Version First 24.12.3
       Reported In:
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: bauer.klaus.dieter at gmail.com
  Target Milestone: ---

Created attachment 182803
  --> https://bugs.kde.org/attachment.cgi?id=182803&action=edit
Example document for testing.

SUMMARY

On Windows, commenting causes the huge "Segoe UI Emoji" font to get embedded,
even after deleting the user profile. This may be symptom of a more general
font handling issue for comments (see "Additional Information").


STEPS TO REPRODUCE

1. Create some PDF document, e.g. from LibreOffice or "Save as PDF" in Chrome.
For a single PDF page, these range between a few dozen KB, and ~200 KB. An
example is attached (194 KB).
2. Delete the user profile in %APPDATA%.
2. Add a typewriter comment on MS Windows and save the document.
3. Redo the same on Linux. Here using "env HOME=$PWD okular" works instead of
deleting the profile.


OBSERVED RESULT

1. On Linux the file now has a size of about 492 KB, up by a factor of 2.5.
2. On Windows it has upwards of 7,174 (!) KB, up by a factor of more than 30
(!).

When looking at details of the file (specifically "font info" in Sumatra PDF),
only the Windows version lists "Segoe UI Emoji". Segoe UI Emoji is a large
font, with the TTF file being 12 MB, which would explain the size difference
(assuming the font file is compressed or partially stripped inside the PDF).


EXPECTED RESULT

1. The increase in file size should be similar regardless of operating system.
2. Additionally, even on Linux the resulting file size significantly exceeds
the file size when commenting with Windows-only PDF tools like Adobe Reader
(388 KB) and PDF XChange Editor (202 KB using Courier New font).


SOFTWARE/OS VERSIONS (Windows)

Okular: 24.12.3
KDE Frameworks: 6.11.0
Qt: Using 6.8.1 and built against 6.8.1
Windows 11 Version 24H2
Build ABI: x86_64-little_endian-llp64
Kernel: winnt 10.0.26100


SOFTWARE/OS VERSIONS (Linux)

Operating System: openSUSE Leap 15.6
KDE Plasma Version: 5.27.11
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.12
Kernel Version: 6.4.0-150600.23.25-default (64-bit)
Graphics Platform: offscreen
Processors: 12 × Intel® Xeon® E-2136 CPU @ 3.30GHz
Memory: 31.2 GiB of RAM
Graphics Processor: Quadro P620/PCIe/SSE2


ADDITIONAL INFORMATION

I also observed, that on Windows Okular always swaps back to "Segoe UI" when
editing a comment, regardless of what the font of the comment originally was.
So the root cause of getting the Emoji font involved might be a general font
handling issue for comments.

On Linux, using a clean user profile brought the file size with comment down
from 790 KB to 492 KB. On Windows, deleting %APPDATA%\okular actually
*increased* the file size from 6,617 KB to 7,174 KB.

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