Re: Multi DPI user interface

[Jonas Ådahl <jadahl gmail com>]

On Thu, Jul 21, 2016 at 09:36:11AM +1000, Brett Sutton wrote:
> Can I suggest that as this work is done you keep in mind (what I hope) is
> the long term objective to provide correct dpi scaling.

Font scaling is out of scope for what is discussed here. This is simply
about integer framebuffer scaling on a logical coordinate space that
makes up the whole desktop area, with all connected monitors, and how to
do screen shooting and casting on such a configuration.

Doing per monitor font scaling is more of a client and Wayland protocol
issue, and not related to all of this.


Jonas

> e.g. a 10 point font should measure 10/72 of an inch regardless of the
> resolution or physical size of a monitor.
>
> I may (as an end user) want to then apply different scaling to each monitor.
>
> The current system where a 10 point font is a different size on each monitor
> makes no sense.
>
> Brett
>
> On 20/07/16 22:27, Bastien Nocera wrote:
> > On Tue, 2016-07-19 at 23:23 +0800, Jonas Ådahl wrote:
> > <snip>
> > > Well, 3 options with the other one being to have "A" and "B" content
> > > be
> > > placed in individual files, i.e. Screenshot - 2016-07-19 - 12:34 -
> > > LVDS1.png and Screenshot - 2016-07-19 - 12:34 - HDMI1.png, each one
> > > with
> > > their correct resolution
> > As Christian mentioned, the 4th option is to pass on that data on "raw"
> > (along with metadata such as the scaling factor), and let the "front-
> > ends" deal with it.
> >
> > For gnome-settings-daemon's screenshot functionality, we'd probably
> > stitch the screenshots together either as per option #1 or #2 but more
> > involved screenshotting tools could offer different options.
> >
> > In short, don't bake the end-user application design choices into the
> > API for this.
> >
> > On that note, relying on the cursor position is as bad an idea as it
> > ever was with touchscreens, or for when we implement the "presentation"
> > screen mode (which is inaccessible for anything but display).
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