@vanvugt
you were right that glPixelStorei was to blame. In ShmBuffer Mir uses
glPixelStorei to change the GL_UNPACK_ALIGNMENT from 4 (that Qt set) to 1 (that
Mir sets, as it is more careful about stride).
Mir fails to restore the state the Qt set, which broke Qt's rendering
from then on.
ShmBuffer only used for clients that do not use GL to draw, so Gtk and
mir demos like fingerpaint, which is why this bug was "random"
Could Mir be patched to revert any GL state changes it makes, when called into
by Qt?
** Changed in: unity8 (Ubuntu)
Status: Confirmed => Invalid
** Changed in: qtmir (Ubuntu)
Status: Confirmed => In Progress
** Changed in: qtmir (Ubuntu)
Assignee: (unassigned) => Gerry Boland (gerboland)
** Description changed:
- Corrupted characters in text rendering, mainly in Unity8 window
- titlebars.
+ Corrupted characters in text rendering.
- I think this is a new issue. It only started happening (on xenial
- desktop) in the past month or two.
+ Only happens after starting non-GL application, like GTK application or
+ mir_demo_client_fingerpaint.
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1583088
Title:
Randomly corrupt font / text / characters in Unity8
Status in Canonical System Image:
Confirmed
Status in gnome-desktop package in Ubuntu:
Invalid
Status in mir package in Ubuntu:
New
Status in qtmir package in Ubuntu:
In Progress
Status in unity8 package in Ubuntu:
Invalid
Bug description:
Corrupted characters in text rendering.
Only happens after starting non-GL application, like GTK application
or mir_demo_client_fingerpaint.
To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1583088/+subscriptions
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