imagico left a comment (openstreetmap/openstreetmap-website#6618)
> It would be nice if we could support high DPI screens. After all, as of the
> latest release of OpenStreetMap Carto it was something we supported. We
> didn't do it perfectly but it certainly was supported. It sounds like the
> current maintainers might be changing that.
To clarify on this (and to possibly also recruit contributors :wink:):
OpenStreetMap Carto has worked towards supporting higher resolution rendering
for more than a decade - relevant early work is, in particular,
https://github.com/openstreetmap-carto/openstreetmap-carto/issues/1165.
Another key step was
https://github.com/openstreetmap-carto/openstreetmap-carto/pull/3657. This
work was substantially stalled by an ugly Mapnik bug
(https://github.com/openstreetmap-carto/openstreetmap-carto/issues/2750), which
led to some polygon patterns (in particular wetlands) being the only remaining
aspect of the style that does not scale properly on higher resolution
renderings (discussed
[here](https://github.com/openstreetmap-carto/openstreetmap-carto/issues/2038#issuecomment-586732159)).
There are some other things (in particular very narrow line signatures) that
could use some tuning specifically for higher resolution rendering, but that is
a fairly perfectionist concern.
It would probably be useful btw. if OSMF operations would clarify if supplying
higher resolution OSM-Carto tiles hinges on the lack of worktime (hence
volunteers interested in working on this are welcome) or if it is a
strategic/economic decision not to (OSMF does not want to put infrastructure
into this, even if there were volunteers willing and able to set this up and
maintain it).
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