Imagine a situation: a laptop that is used by itself, or docked at place
A, or docked at place B, frequently moving around.
In each case there are different display(s) and each configuration has a
comfortable DPI setting (not necessarily matched with physical DPI).
I apply xrandr configuration with needed DPI, some set of programs
conform to this. I publish DPI to xrdb, another set of apps is affected,
finally I configure fontconfig to affect the rest.
I successfully automated the whole process recently
(https://github.com/Vladimir-csp/rerandr3), it does the job more or
less. But I feel the strong urge to choose 2 sets of apps out of these
3, declare their behavior as buggy and submit some bug reports, no
matter how futile they may be.
2017-07-26 09:52, Pekka Paalanen пишет:
On Tue, 25 Jul 2017 21:15:31 +0300
Vladimir Kudrya <[email protected]> wrote:
Hi all!
I would like to know the current 'proper' way of setting DPI in X (if
there is any).
I see conflicting information on the topic, and different applications
seem to have different source of this setting. I currently counted 3 of
them:
- fontconfig
- xrdb
- randr
Different versions of gtk2 seem to either demand or ignore dpi setting
in xrdb.
And there is also this recent change that gives xdpyinfo the ability to
state different DPI for different outputs simultaneously:
https://lists.x.org/archives/xorg-devel/2017-April/053430.html
Is there any DE- and toolkit-agnostic approach for letting applications
know the proper DPI and/or notifying them that DPI has changed?
Hi,
rather than asking "how to set the DPI", why do you want to set the
DPI, what do you hope to accomplish?
Are you looking for making fonts physically the same size on different
monitors?
Are you trying to cope with HiDPI monitors?
Are you trying to make physical measurement units in applications
correspond to real physical dimensions on the screen?
Even these are fairly low-level questions and would need an explanation
on what you are really trying to make to work. Some goals are false to
begin with, some are reasonable but technically hard, and some have
existing solutions depending on software.
In general, DPI is a mess, and very often the actual DPI number is
not even what one should be concerned with.
Thanks,
pq
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