x0vncserver HDR (10-bit) support

[nameiwillforget]

Is your feature request related to a problem? Please describe.
While attempting to use my laptop to connect to my desktop session using x0vncserver, I found that I couldn't do it as long as the color depth of the desktop was at 10 bit (that of my laptop is at 8).

Describe the solution you'd like
An option to display the current session at a different color depth, similar to -geometry for resolutions.

[CendioOssman]

I don't know if anyone has ever tested things on HDR system, so I'm not surprised there are issues.

Exactly what happens when you try to use x0vncserver?

[nameiwillforget]

"Pierre Ossman (ThinLinc team)" ***@***.***> writes:

I don't know if anyone has ever tested things on HDR system, so I'm not surprised there are issues. Exactly what happens when you try to use x0vncserver?

On the server side: ``` ***@***.*** tmp]$ x0vncserver -geometry 1920x1080 -rfbauth ~/.vnc/passwd Fri Mar 1 19:13:18 2024 Geometry: Desktop geometry is set to 1920x1080+0+0 XDesktop: Using evdev codemap XDesktop: XDesktop: XTest extension present - version 2.2 XDesktop: RANDR extension not present XDesktop: Will not be able to handle session resize Main: Listening for VNC connections on all interface(s), port 5900 Fri Mar 1 19:13:22 2024 Connections: accepted: 10.0.0.13::41268 SConnection: Client needs protocol version 3.8 SConnection: Client requests security type VeNCrypt(19) SVeNCrypt: Client requests security type TLSVnc (258) XDesktop: Enabling 8 buttons of X pointer device VNCSConnST: closing 10.0.0.13::41268: invalid pixel format EncodeManager: Framebuffer updates: 0 EncodeManager: Total: 0 rects, 0 pixels EncodeManager: 0 B (1:-nan ratio) Connections: closed: 10.0.0.13::41268 ``` On the client side it just says that the connection was closed.

[CendioOssman]

Thanks. Unfortunately, this is expected. I even found a comment in the code:

tigervnc/common/rfb/PixelFormat.cxx

Lines 685 to 688 in e9d7851

	/*
	* We don't allow individual channels > 8 bits in order to keep our
	* conversions simple.
	*/

It might be possible to support your use case, but unfortunately, it is rare enough that it might take some time before anyone has a look at it.