[Libreoffice-bugs] [Bug 136689] New: IMPRESS: slide background color does not cover the whole slide in presentation mode

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=136689

            Bug ID: 136689
           Summary: IMPRESS: slide background color does not cover the
                    whole slide in presentation mode
           Product: LibreOffice
           Version: 6.4.6.2 release
          Hardware: All
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Impress
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: sergio.callegari at gmail.com

Description:
When you start a new presentation and you set a slide background color, in
presentation mode, the color does not cover the whole of the slide and a white
1-pixel zone often remains visible on the right side of the slide. This does
not happen in edit mode.

See the attached screenshot.

While this is just a small aesthetic issue, it is one of those little things
that make impress lose credibility in professional environments. The effect is
particularly poor when using dark slide backgrounds.

Seeing the issue in Linux, both in 6.4.x and in 7.0.x. Don't know if it is
specific to the linux presentation routines.  Similarly it is unclear to me if
this occurs with all screen resolutions, slide sizes and form factors, etc.

My uninformed guess is that there is some rounding issue somewhere when scaling
the slide to the correct size for presentation. 

Steps to Reproduce:
1. Start impress, begin new presentation, set slide size to "screen 4:3" which
on my system gives a 280x210 mm slide (unknown to me if this is locale
dependent and if the issue is present for all form factors)

2. Using the slide properties dialog set the slide background to some solid
color (e.g. RED)

3. Start the presentation

Actual Results:
In presentation mode, the slide has the correct background, but for a white
region on the right, about 1 pixel thick.

Expected Results:
The slide should all have the right background color in presentation mode.


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: PresentationDocument
[Information guessed from browser]
OS: Linux (All)
OS is 64bit: yes

In LibO 6.4.x the issue is present both with and without OPENGL.
In LibO 7.0.x I have no OPENGL setting.
In both versions, the issue is present both with and without antialiasing.

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