Hi Martin,
Thanks for sharing this initial version - it's great to see some of the
possibility.
Is this something you would like to / be able to develop? I'd be
interested in exploring the possibility of developing this, and am happy
to put some money in towards this if you (or anyone else) is interested.
Please do let me know your thoughts.
Best wishes,
Nick.
On 3/22/22 12:31, Martin Dobias via QGIS-Developer wrote:
Hi Andreas!
On Tue, Mar 22, 2022 at 9:49 AM Andreas Neumann <a.neum...@carto.net>
wrote:
Would any part of the current QGIS Desktop part be re-usable in a
"web assembly" QGIS? Or would the GUI part have to be re-developed?
In theory, we could try to run QGIS Desktop as it is in WebAssembly
environment in the browser, Qt generally supports that. There are many
question marks though, among some I can think of:
- dealing with files / data sources - this would need many changes to
accept the fact that we are not dealing with a local file system and
that access to raw data over network will be generally much slower.
Also persistence of data - you will probably want to have some server
backend anyway to store the data.
- Qt Widgets-based apps can be run on WebAssembly, but I have a
feeling that the performance would not be great, due to the way how
the get rendered on screen (all work done on CPU) - I would expect
that an optimized OpenGL / WebGL based GUI would have much better
performance in browsers - probably based on Qt Quick module (like
Input / QField)
I would also assume that access to local files would be very
restricted - right? Network based resources (DB access and web
services) would probably work fine?
Indeed, access to local files from browser would not be possible at
all - data would need to come from the server. Network based resources
would work fine, but with various limitations - for example, you are
normally not allowed to request resources from other servers unless
the servers allow that [1], and you can't directly access services
like PostgreSQL that are not HTTP servers (although of course this
could be handled by tunneling through WebSockets, or using HTTP-based
protocols like Postgrest).
Cheers
Martin
[1] https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
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