Some characters are invisible (libreoffice/freetype) - depends on font-rendering

Bug #1464056 reported by RichardNeill on 2015-06-11
22
This bug affects 3 people
Affects Status Importance Assigned to Milestone
freetype (Ubuntu)
Low
Unassigned

Bug Description

Symptom:
  Certain characters are not reliably displayed in LibreOffice. Which character is visible depends on font size, font face, and even mouse-over. It looks as though about 40% of the letters have been randomly made white-on-white!
(This is really weird to track down, and extremely annoying!)

Debugging:
 * I note that this affects LO, but not export to PDF. It also shows up in Abiword.
 * The font needs to be about 18pt or higher to show this, eg Liberation Sans, 18pt. Font-face doesn't seem to matter.
 * Mouse-over the text, or even changing the window size alters which letters vanish.

Test case (after hours of experimenting):
 * Font-rendering: smoothing = None -> triggers this bug.
 * Font-rendering: smoothing = Greyscale -> all is well.

I attach some screenshots both ways, to make this clear, showing both LO and the control panel. Toggling from one setting to the other makes the bug appear/disappear immediately.

I think the root cause is in libfreetype6, but it might be in Cairo, or elsewhere.
I'm using Ubuntu Wily-64 (having upgraded today from Vivid which also had the same bug)
I'm running this under Ubuntu-Mate.

Still present as of 5th August in latest Wily.

This may be more useful filed upstream:
https://github.com/mate-desktop/mate-control-center/issues/174

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in freetype (Ubuntu):
status: New → Confirmed

...and it's still here in 16.04.1 LTS.
Any chance of a fix?

Adolfo Jayme (fitojb) on 2017-03-18
Changed in freetype (Ubuntu):
importance: Undecided → Low
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