M291 should be able to show images from SD card

[Swaper]

Hi everybody, i am a newbie on this forum , but already spent more then 7 years of my life with Duet boards.
So now I am trying to make a "dumb-user" friendly printer, based on Duet Wifi + PanelDue. I have created a handy menu using macro folder, i am able to conduct a dialog with user, but sometimes I need to show a picture to explain in more convenient way what to do next. It would be very handy if M291 command with some flag be able to show pictures from SD card.

I hope this feature is can be implemented and our Godlike developers have this in their plans?

P.S. Also would be great to have same feature in DWC

[NeoDue]

@Swaper The Duet devs might not be godlike, but they are indeed really close if I take a look at the amount of great support they do here. It might help to leave out the sarcasm though when posting a request...

I had the same issue when I created my printer calibration routine. My guess is the biggest obstacle would be missing computing power of the display - just take a look how long it takes to show the preview picture if you open the details page of a gcode file on the PanelDue.

I would get crazy if a message popup would take that long to show me the picture

If you happen to be able to display your instructions using ASCII art, that might work - as long as you can do it in one line at least, since M291 also does not support line breaks. This is how I solved that obstacle in my case...

But I fathom it would probably be easier to implement a line break for an M291 message than to get a picture onto the PanelDue with a remotely decent speed.

[T3P3Tony]

@Swaper pictures on a paneldue are unlikely to be possible at a sensible speed.