https://bugs.kde.org/show_bug.cgi?id=441329
Bug ID: 441329
Summary: Marble Maps mobile app: "Vector OSM" map does not
honor Plasma Mobile screen scaling, renders only in
upper left corner
Product: marble
Version: Marble Maps 1.0 (Android)
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: android
Assignee: marble-b...@kde.org
Reporter: kevin.kof...@chello.at
Target Milestone: ---
SUMMARY
I tried the Marble Maps mobile application on Plasma Mobile on my PinePhone.
(The latest I tried is from KDE Gear 21.08.0.) The application defaults to the
"Vector OSM" OpenStreetMap vector data renderer (and actually, I do not see any
way to switch to another map). Unfortunately, the rendering is broken (as
described below) due to mishandling screen scaling.
STEPS TO REPRODUCE
1. Get a PinePhone running Manjaro Plasma Mobile (or I presume this can also be
reproduced on any other Plasma Mobile distro).
2. Run Discover and install Marble Maps.
3. Run Marble Maps from the menu.
4. Look at what gets rendered. Also notice how moving around the map does not
resolve the issue.
(Note that I was unable to reproduce this on my desktop computer using desktop
Marble and manually setting QT_SCALE_FACTOR=2.)
OBSERVED RESULT
The screen scaling factor (which defaults to 2.00× on the PinePhone) appears to
be ignored: The map rendering only fills the upper left quarter of the canvas.
(And there is no clipping, so larger features can end up drawing into the
unused remainder of the canvas.)
EXPECTED RESULT
The map rendering fills the entire canvas, either by being scaled to twice the
size, or by just drawing more of the map.
SOFTWARE/OS VERSIONS
Windows: no
macOS: no
Linux/KDE Plasma: Manjaro-ARM (Plasma Mobile edition)
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I filed this against the "android" component because this is with the mobile
Kirigami Marble Maps app originally developed for Android. But I am running
Plasma Mobile, not Android.
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