https://bugs.documentfoundation.org/show_bug.cgi?id=113933
Bug ID: 113933
Summary: Incorrect font rendering with Impress
Product: LibreOffice
Version: 5.0 all versions
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Impress
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: gibt...@gmx.de
Hello everyone,
I would like to report a small but pretty annoying error in LibreOffice
Impress, appearing in all versions I tested so far, including the latest
release. Mainly it is just a "visual" problem, but a really problematic one
that mainly forces me to switch to PDF export and PDF presentations.
If you create a small presentation including some text on a slide (even black
text on a white slide without anything else reproduces this error), it looks
perfectly ok in the editing window. However, as soon as you open the presenter
console with hardware acceleration enabled, you see extremely ugly fonts with
pretty annoying rendering artifacts. If you disable the hardware acceleration,
the fonts will look better, but other things like shapes or included
SVG-figures are badly rendered. Interestingly, with enabled hardware
acceleration, this included non-text stuff like SVG-figures look great, even
embedded fonts in them look perfect. Hence, I only can conclude that there is
something going wrong with the rendering of normal text boxes with enabled
hardware acceleration. I also would like to emphasize that in editing mode,
everything always looks pretty alright, the bug only appears in fullscreen
presentation mode. I also tried all kinds of different view and rendering
settings (OpenGL etc.), this problem still appears.
Further I'm using a Windows 10 / Linux dual boot configuration, and this issue
only appears in the Windows version of LibreOffice. If I switch to Linux (KDE
neon LTS), the fonts look perfect with or without hardware acceleration, only
disabling it will result in badly rendered SVG-figures. But of course, if I
keep the hardware acceleration enabled, everything looks perfect. There is only
one small error appearing sometimes depending on the way how SVG-figures are
placed closed to text; sometimes I get some artifacts visible as thin white
lines "cutting through" the letters of the respective text. I don't know if
this is somehow related, but the problem is much more tolerable. Interestingly
it does only appear on Linux, not on Windows.
A possible workaround is to use the PDF export and present the slides using a
PDF viewer. However I would like to use the presenter console directly to avoid
PDF exports (pretty annoying if you want to change something on a slide and
always reexport everything).
I also created a topic dealing with this issue in the LO forum; since there has
no solution been found, I would like to report this as a bug. Here is the link
to my previous question, there is also an example image showing the problem:
https://ask.libreoffice.org/en/question/98075/impress-incorrect-font-rendering-in-presentation-mode/
I hope that this can be easily fixed... Thanks in advance! :-)
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