Re: Multi DPI user interface

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.


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.


On 20/07/16 22:27, Bastien Nocera wrote:
On Tue, 2016-07-19 at 23:23 +0800, Jonas Ådahl wrote:
Well, 3 options with the other one being to have "A" and "B" content
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
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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