[Bf-committers] Automatic DPI detection issues

[Sergey Sharybin]

Hi,

Answers are inlined.

It the UI is too small you scale it up, if it's too big you scale it down?
>

Is this interface too small or too big:
http://pasteall.org/pic/show.php?id=117179

What should i put to a Scale factor to make it proper "kerning" ?

It's not clear to me what you mean by improperly displayed fonts here, I
> tried various DPI values in 2.78 and various UI scale values in master and
> the fonts always look ok to me.
>

Just force getDPIHint() to return 88 and see font artifacts, similar to the
screenshot above.


> > - Not reporting detected DPI is also wrong.
> >
>
> I don't know of any other application reporting this in the UI, why does
> the absolute value matter to the user?
>

Maybe because other applications are not failing that badly on displaying
good fonts by default?


> > - Not being able to correct auto-detected DPI also sounds wrong. All the
> DE
> > will have option to override X11 DPI specifically for the case when X11
> > reports wrong DPI.
> >
>
> Again, it can be corrected by changing the UI scale. This is fully
> equivalent to adjusting the DPI value.
>

With the difference that i do have a remote idea what my DPI should be, but
i've got no idea what should be the scaling factor to compensate badly
working fonts in Blender.


> >
> > P.S. I wouldn't know if other applications are detecting DPI correctly
> (as
> > in, not sure they are using crappy DPI of 88x89 or are rounding it to
> some
> > more commonly used DPI), but it's only Blender which has badly rendered
> > fonts on my system.
> > P.P.S. Surely i can force/correct X11/DE's DPI, but then i don't see any
> > benefit on the auto-detection of DPI. It only causes issues rather than
> > solving anything.
> >
> > On Thu, Jul 13, 2017 at 1:15 PM, Brecht Van Lommel <
> > brechtvanlommel at pandora.be> wrote:
> >
> > > As mentioned in the commit log, the UI Scale setting in the Interface
> tab
> > > can be used, doesn't that work?
> > >
> > > If you look at the equivalent settings for Windows/macOS/Gnome/Unity/..
> > > they also offer a scale or percentage. I see no reason to show the
> > absolute
> > > DPI.
> > >
> > > Linux doesn't have a single window manager standard for specifying DPI,
> > but
> > > we use the same convention as Chrome or Firefox which works in many
> > window
> > > managers, it certainly isn't random. Are you saying the DPI is not
> being
> > > detect correctly on your system, while it works in other applications?
> > > Perhaps we can fix that?
> > >
> > > On Thu, Jul 13, 2017 at 12:32 PM, Sergey Sharybin <
> sergey.vfx at gmail.com>
> > > wrote:
> > >
> > > > Hi everyone,
> > > >
> > > > Today i've run into annoying/hard to predict situation: running my
> > > regular
> > > > blender was working fine, but doing --factory-startup was messing up
> > > fonts
> > > > in Blender's interface.
> > > >
> > > > it turns out, this commit is responsible for such behavior [1].
> > > >
> > > > What happens is, when there is existing user-preferences.blend,
> Blender
> > > > will use DPI stored in there. Otherwise, Blender will use
> auto-detected
> > > > DPI. This has following issues:
> > > >
> > > > - This is totally unpredictable, changes Blender interface based on
> > some
> > > > rather random factors.
> > > > - Blender does not tell user what DPI it detected (yes, the commit
> > > removed
> > > > setting from User Preferences)
> > > > - If system reports buggy DPI, there is no easy way to know what's
> > > causing
> > > > it and how to correct.
> > > >
> > > > So i think we should bring DPI setting back to user preferences. It
> is
> > > > really bad practice to secretly use setting, without even telling
> what
> > > the
> > > > value of the setting is. It is also bad practice to auto-detect
> > something
> > > > and not give any clues to user what the detected value is. And
> finally,
> > > > there should be a way to override auto-detected DPI, for the exact
> case
> > > > when the reported one is bad.
> > > >
> > > > [1] https://developer.blender.org/rBfe3fb23
> > > >
> > > > --
> > > > With best regards, Sergey Sharybin
> > > > _______________________________________________
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> > > >
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> > >
> >
> >
> >
> > --
> > With best regards, Sergey Sharybin
> > _______________________________________________
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> > Bf-committers at blender.org
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> >
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-- 
With best regards, Sergey Sharybin