Re: HiDPI and fractional scaling

[Emmanuele Bassi <ebassi gmail com>]

hi;

On 3 February 2014 13:54, Alexander Larsson <alexl redhat com> wrote:

> > It seems to me X can properly expose the DPI, physical dimensions and
> > logical dimensions in pixels of each screen, so would it be possible to
> > use these correctly wherever the app starts, and signal the app if it
> > ever needs to move (as a whole) to a different output?

X11 can definitely expose that information, *but* hardware
manufactures are not in any way compelled in providing reliable,
accurate, or even physically plausible data for us to use.

for examples, see the thread referenced directly in the
gnome-settings-daemon source code:

https://git.gnome.org/browse/gnome-settings-daemon/tree/plugins/xsettings/gsd-xsettings-manager.c#n70

and this recent bug:

https://bugzilla.redhat.com/show_bug.cgi?id=1025391

especially comment 7, in which a 15" display says to be 86x32
millimetres in size, and comment 14, in which the EDID for a 37"
television display exposes the same data as the 32" model.

ciao,
 Emmanuele.

-- 
W: http://www.emmanuelebassi.name
B: http://blogs.gnome.org/ebassi/