touch-packages team mailing list archive

[RichardNeill <ubuntu@xxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: freetype (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: abiword antialiasing font-rendering freetype libreoffice smoothing

** Attachment added: "This is a screenshot of it not working rightly."
   https://bugs.launchpad.net/bugs/1464056/+attachment/4412906/+files/font_bug_borked.png

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https://bugs.launchpad.net/bugs/1464056

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

Status in freetype package in Ubuntu:
  New

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.

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