[Libreoffice-bugs] [Bug 106526] UI 4k Slide Presentation screen causes crash for x86, messed up for x64

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=106526

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
                 CC|                            |caolanm at redhat.com,
                   |                            |michael.meeks at collabora.com
                   |                            |, tml at iki.fi
           See Also|                            |https://bugs.documentfounda
                   |                            |tion.org/show_bug.cgi?id=10
                   |                            |7090
     Ever confirmed|0                           |1

--- Comment #15 from V Stuart Foote <vstuart.foote at utsa.edu> ---
OK confirming, now have an external 4K monitor to test against (Samsung MU6300
40").  With 5.3.3.2 running on Windows 10 Home on a Lenovo Ideapad FLEX4
w/Intel i7-7500 and Intel HD Graphics 620 GPU -- native display panel is
1920x1080 at ~141 PPI

HDMI connection to the external defaults to duplicate of the 1920x1080. Setting
the Windows Display Settings shows the desktop mirrored with content scaled
300%.

A presentation in mirrored mode displays scaled on the 4K and the 1080p display
panel--the 4K a bit pixelated.

Using Windows Display settings set "Extend these displays"; and set LO Impress
-> Slide Show -> Slide Show Settings: Multiple Displays Presentation Display
drop list from default Auto -> Display 2 (external); and run presentation. The
slides display, but are notably pixelated from scaling applied (by Windows).

Again with Windows Display Settings, set the 4K display to scale at 100%, and
repeat.

This works correctly with OpenGL rendering, and also with CPU only rendering:
presentation to external 4K is clear and crisp at full 4K resolution as driven
by the Intel GPU

But with "Use Hardware acceleration": the presentation rendered to 4K display
is garbled as OP reports.

Use OpenGL or CPU only rendering and Presentation mode is correctly rendered.

Also, I had the same result on a MS Surface Pro 4 (Intel i7-6650DU w/Iris
Graphics 540)  2736x1824 at ~267 PPI with LO 5.1.1.3; presentation mode renders
garbled with "Use hardware acceleration" but is correct for OpenGL rendering,
or CPU only rendering.

So this seems to be related to the later introduced font rendering issues of
see also bug 107090 (at 5.3), and this behavior of the non-OpenGL hardware
acceleration of the Presentation canvas is a LO issue--at least on Windows
builds.

Curious if folks with HiDPI under Linux builds are having the same issues?

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