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Links2004 / arduinoVNC

a VNC Client for Arduino based on rfbproto
GNU General Public License v2.0
307 stars 58 forks source link

Scaling #11

Open njordan77 opened 6 years ago

njordan77 commented 6 years ago

Sorry to write this as an issue, but did not see any different way to get in touch. Is there any way to scale a 640x480 remote session on a 2,8inch 320x240 display....I can connect to remote server (NodeMCU+ILI9341)...to my heating system. BUT the image is completely messed up. Guess this is because of the pixel mismatch. Could not find any way to change/scale the incoming resolution.....is there anything possible? as i do not know of any ILI9341 displays that would be handling 640x480.

Cheers, Norbert

Links2004 commented 6 years ago

Scaling needs to be done on the server side, the ESP has to less power for this. most server support geometry as option.

the lib only requests the 320x240 but some servers have a bad implementation and always send the full image regardless of what is requested via the protocol. this is most likely why you image is messed up. if the server is correct implemented you will get the 320x240 pixel from the top left if the VNC server geometry is bigger then the 320x240.

https://github.com/Links2004/arduinoVNC/blob/master/src/VNC.cpp#L809 https://github.com/Links2004/arduinoVNC/blob/master/src/VNC.cpp#L667

to get the full image the best you can do is set the geometry on the server correct.

for linux this may help: https://github.com/Links2004/arduinoVNC/issues/3

njordan77 commented 6 years ago

Hi, thanks for your feedback and ideas.

What makes me sceptical about your scaling speculation is that the server (a heating with linux-based OS) works OK with a Raspi Zero and a 480x320 display and the server display is a 640x480 one...so for RealVNC viewer @Stretch Linux it works to scale down....as you said that scaling is done at server side.

Is there anything else I could change in the source code to force something (?)