Stem Darkening boundaries are incorrect for high ppi ('retina') displays (with fractional scaling)

[taprobane99]

Your script works perfectly on my 70 ppi display.

I noticed that stem darkening had little visual effect on my 260 ppi and 218 ppi displays.

Both displays are set to 200% scaling.

But after altering the default boundaries from 500, 1000, 1667, 2333 to 1000, 2000, 3334, 4666 it works.

Thinking about it, this makes sense, as each glyph will be drawn with double the number of pixels.

Also, I have set the darkening values to 500,500,500,0 but it still doesn't quite match the darkness on Mac OS X.

So, perhaps you could adjust the values in your script depending on the fractional scaling values set? The boundaries should also need to be changed by x1.25 for 125%, x1.5 for 150% scaling etc.

As for the darkening values, not sure on the solution. Perhaps those would also need to be changed by x2 etc. but obviously you can't exceed 500.

[maximilionus]

So, perhaps you could adjust the values in your script depending on the fractional scaling values set? The boundaries should also need to be changed by x1.25 for 125%, x1.5 for 150% scaling etc.

That is a really great idea. I don't use scaling that often since I usually stick with 2560x1440 monitors around 24 inches, so here's why this is not thought out well.

The worst part is... There is simply no unified way to query the scaling values for Linux environments. That was an easy-peasy task when X11 sessions ruled the desktop world, but nowadays, that's more and more about Wayland, and here in the Wayland realm, there's a complete zoo of solutions, each one of them working only with one specific environment it's designed for.

Sadly, not even the XDG Portals help with that for now, so the best we can do here is to support only a few of them: gsettings for GNOME (and GNOME-like) and qdbus for KDE Plasma (and Qt environments, although not sure about that).

As for the darkening values, not sure on the solution. Perhaps those would also need to be changed by x2 etc. but obviously you can't exceed 500.

Yep, that's impossible, 500 is the max darkening value.