Re: HiDPI (Retina) upscaling

[Andras Sali <sa...@gmail.com>]

Hi All,

I have followed up a bit on this topic and have put together a POC using
Tensorflow.JS and Guacamole.

The idea is that I have trained a convolutional network using high-low
resolution screenpairs and then interactively this is applied in Guacamole
using Tensorflow.JS WebGL backend.

Currently this seems to be working relatively well using Chrome / Edge (as
this supports WebGL in webworkers). Currently only devicePixelRatio=2 is
supported (e.g. most HiDPI laptops or for external screens the scaling
needs to be set to 200%).

If someone is interesting in trying it out, I have put together a self
contained docker-image which is available at
https://hub.docker.com/repository/docker/andrassali/guac-scale

This simply runs a VS Code application, which can be accessed on
http://localhost:8080. Scaling can be disabled via using the URL
http://localhost:8080?disableScaling=1

I have also put it up via a simple azure web app if someone would like to
try it without pulling the docker image:

https://guacscale.azurewebsites.net/

https://guacscale.azurewebsites.net?disableScaling=1 (to disable the
scaling)

I would be curious for the feedback if there is interest in incorporating
such a feature into Guacamole. I would be happy to start to set up a PR
process in this case. The performance is acceptable I believe, there is a
bit of lag sometimes when 'sharpening' the image, but I find it quite
usable.

Many thanks,

András


On Mon, Dec 20, 2021 at 4:36 AM Nick Couchman <vn...@apache.org> wrote:

> On Thu, Dec 16, 2021 at 3:45 AM Andras Sali <sa...@gmail.com> wrote:
>
> > Hi All,
> >
> > I was wondering if someone had a better approach to handle HiDPI / retina
> > screens than the ones I outlined above as users have more and more of
> such
> > devices and out-of-the box Guacamole feels quite blurry on such devices.
> >
> > Thanks for any feedback you might have,
> >
> >
> Andras,
> Sorry for the lack of feedback from me - this is a bit out of my current
> realm of knowledge as it relates to both display technologies and how
> Guacamole handles them, so I'm not sure I have any valuable feedback for
> you.
>
> If you have suggestions, or end up modifying code and want to contribute it
> or have it reviewed, I would highly encourage you to go through the
> contribution process and open a pull request. We value this kind of
> community involvement!
>
> -Nick
>