[Libreoffice-bugs] [Bug 116888] Monochrome gif in a writer-document exported to pdf at low dpi renders fonts in outline , with OpenGL rendering

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=116888

V Stuart Foote <vstuart.foote at utsa.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW
             Blocks|                            |93529
            Summary|export a monochrome gif in  |Monochrome gif in a
                   |a writer-document to pdf    |writer-document exported to
                   |fails                       |pdf at low dpi renders
                   |                            |fonts in outline, with
                   |                            |OpenGL rendering

--- Comment #12 from V Stuart Foote <vstuart.foote at utsa.edu> ---
Workaround -- disable OpenGL rendering...

Confirming on Windows 10 Home 64-bit en-US
Version: 6.0.3.2 (x64)
Build ID: 8f48d515416608e3a835360314dac7e47fd0b821
CPU threads: 4; OS: Windows 10.0; UI render: GL; 
Locale: en-US (en_US); Calc: CL

and recent master/6.1.0
Version: 6.1.0.0.alpha0+ (x64)
Build ID: 55e84652ae84bd2374462ee19afd359a8cc90b95
CPU threads: 4; OS: Windows 10.0; UI render: GL; 
TinderBox: Win-x86_64 at 42, Branch:master, Time: 2018-04-13_05:08:28
Locale: en-US (en_US); Calc: CL

STR
1. Enable OpenGL rendering
2. Open attachment 141212 to writer
3. Export (or Export as) to PDF
4. defaults (or profile reset):

   JPEG quality 90%
   reduce image quality to 300dpi
   create PDF form FDF
   export boookmarks

5. export --> PDF renders font as filled

6. reduce image quality to 150dpi (or 75dpi)

7. export --> PDF renders font to outline

Same affect on font rendering with Lossless compression, settings above 300dpi
font is fully formed--150dpi and below the font is rendered outline.

However, _disable_ OpenGL rendering, repeat STR. And with default rendering,
glyphs are filled at all resolutions. So this seems an issue with OpenGL
rendering of the masked GIF.

The image is masked in Writer (so displaying just the "letterhead"). From
ImageMagick's identify:

Image: 10000000000009B000000DB4D1C9DDC86292E537.gif
  Format: GIF (CompuServe graphics interchange format)
  Mime type: image/gif
  Class: PseudoClass
  Geometry: 2480x3508+0+0
  Units: Undefined
  Type: Bilevel
  Base type: Palette
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8/1-bit
  Channel depth:
    Gray: 1-bit


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=93529
[Bug 93529] [META] VCL/OpenGL rendering tracker bug for 5.0+
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