[Fontconfig] Xft with multiple DPIs/multihead doesn't support different DPI

[Behdad Esfahbod]

On Mon, Mar 26, 2018 at 1:19 AM, Ben Stern <bas-savannah at ubrew.org> wrote:

> Hi Behdad,
>
> I used KDE to set the DPI, but I don't use a desktop environment in normal
> life.  Is there truly no way to set different resolutions without using a
> desktop environment?  How does GNOME do it?  It must tell fontconfig
> somehow, mustn't it?
>

Desktop environments can handle multiple differing display densities in
different ways. They can rescale the application for example, and I *think*
that's what GNOME does. They can also tell fontconfig different DPI numbers
at run-time, but that's really not the hard part about it.



> Thanks,
> Ben
>
>
> On Mon, Mar 26, 2018 at 01:16:51AM -0700, Behdad Esfahbod wrote:
> > Hi Ben,
> >
> > You need a desktop environment that supports different DPIs across
> > different displays. I *think* most recent versions of GNOME do that but
> I'm
> > not sure.
> >
> > behdad
> >
> > On Mon, Mar 26, 2018 at 12:52 AM, Ben Stern <bas-savannah at ubrew.org>
> wrote:
> >
> >> In my fontconfig/conf.d, I can specify fontconfig XML which states a
> given
> >> DPI, but I can't specify this per-head.
> >>
> >> I'm running multihead on monitors with different resolutions, and my
> >> choices
> >> are huge fonts on the lower-resolution monitor and normal sizes on the
> >> higher resolution monitor, or unreadably small fonts on this hi-res
> monitor
> >> and normal size on the low-res monitor.
> >>
> >> xdpyinfo | grep inch correctly tells me
> >>     on :0.0: 157x157 dots per inch
> >>     on :0.1: 94x94 dots per inch
> >>
> >> xrdb -query | grep dpi correctly tells me
> >>     on :0.0 XFt.dpi: 157
> >>     on :0.1 XFt.dpi: 94
> >>
> >> farad:~/.config/fontconfig/conf.d$ grep -i -A2 dpi *
> >>     19-DisplayProperties.conf: <edit name="dpi" mode="assign"
> >> binding="same">
> >>     19-DisplayProperties.conf- <double>157.0</double>
> >>     19-DisplayProperties.conf- </edit>
> >>
> >> Note that without the 19-DisplayProperties.conf setting the DPI to 157
> >> explicitly, the menus and other fontconfig-rendered text on my hi-res
> >> monitor appears to be defaulting to the historic 96 DPI setting, and are
> >> therefore tiny, because they're approximately 60% of the size they
> ought to
> >> be.
> >>
> >> How can I tell fontconfig to use the correct DPI on a given head?
> >>
> >> (I tried to open this as a bug and was directed here instead.)
> >>
> >> Thanks,
> >> Ben
>
> --
> Ben Stern
> This space intentionally left blank.
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-- 
behdad
http://behdad.org/
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