[QGIS-Developer] Call of testing of nightlies on hi-dpi displays

[Nyall Dawson]

On Mon, 29 May 2023 at 19:23, Richard Duivenvoorde <rdmailings at duif.net> wrote:
>
> Hi Nyall,
>
> Happy to do some testing, I do have a (dual boot) laptop/tablet with 3000x2000 screen (that's high-dpi, yes?), but in Gnome I set the Display 'Scale' on 200% to have proper applications (an to me readable text :-) ).
>
> Is there some test plan/idea's?

There's a few things in particular we need to identify:

- Widgets which are now showing as pixelated. Basically just hunt
through the UI looking for things which look pixelated! This might be
icons, graphics, or even just the drawing of the widget itself. You'll
spot them immediately, as they clearly stand out. But there's a LOT of
different dialogs/tabs/widgets/pages/... in QGIS and it will take some
time to hunt through them all.
- Icons/images which look the wrong size. Eg the marker symbols shown
in the layer tree right now are incorrectly sized and will be half the
size of the actual symbol shown on the map. That's a known regression,
but there's likely others like this hiding around the place.
- Text which is the wrong size. If something has a hard-coded sizing
it's possible that we'll get fonts scaled badly, so if you spot any
text which noticably looks incorrectly sized vs other UI elements then
that's also something we need to fix.

> Is my setup something you want to test (200%), or is is preferred to use the 100% scale?

This is EXACTLY the kind of setup we need testing on! If the display
scaling is set to 100% (in Windows, or Linux), then you'll see no
difference between the old approach vs new. The new logic only kicks
in when display scaling is present.

> I'm not sure what is supposed to be the 'normal' way of scaling (like what does a mac do)?

Things should just look perfect, regardless of whether or not display
scaling is active :)

Nyall

> Or is it more to try to see if the icons/widgets scale up/down when fidling with scale (or what it is called in Windows)?
>
> Regards,
>
> Richard Duivenvoorde
>
> On 5/29/23 06:01, Nyall Dawson via QGIS-Developer wrote:
> > Hi lists,
> >
> > For the upcoming QGIS 3.32 release a change has been made in how QGIS
> > handles high dpi (and retina) displays. This should ultimately make
> > QGIS behave MUCH better on these displays, but there's likely some
> > short-term fallout and regressions caused by the change.
> >
> > If you've access to a high-dpi display, please test out the nightly
> > releases and file bug reports on github for any regressions you spot
> > -- in particular we are looking for widgets and places where the QGIS
> > interface is now looking pixelated or where the scale / sizes of
> > objects are incorrect.
> >
> > (Currently there's known regressions for the icons shown in the layer
> > tree panel, and for pixelated icons in the style manager dialog.)
> >
> > Thanks in advance!
> > Nyall
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