xpra shadow: on client maximize, scale the other screen "perfectly"

[stdedos]

Attempt to almost imitate the RDP protocol.

I would guess that changing the underlaying resolution would be way too complicated, since the monitors are attached to physical monitors.

When maximizing the client (or going full screen), attempt to scale the image perfectly to size (optionally, give the option to add black bars to avoid weird stretching).

Note that the scale "you" are doing might be better than the OpenGL scaling (text is unreadable, there are too many artifacts)

[Antoine Martin]

Previously discussed in #2455 where some screenshots can be found.

Note that the scale "you" are doing might be better than the OpenGL scaling (text is unreadable, there are too many artifacts)

I don't understand this bit. OpenGL scaling is not meant to give any artifacts. There may be a slight blur with non whole integer scaling, but when scaling by 200%, it should be "pixel perfect" - which just means you get jagged edges.

[stdedos]

Replying to Antoine Martin:

Previously discussed in #2455 where some screenshots can be found.

Note that the scale "you" are doing might be better than the OpenGL scaling (text is unreadable, there are too many artifacts)

I don't understand this bit. OpenGL scaling is not meant to give any artifacts. There may be a slight blur with non whole integer scaling, but when scaling by 200%, it should be "pixel perfect" - which just means you get jagged edges

Apologies, I keep forgetting to mention everything all the time 😅.

My usecase is scaling down, not up. (Q)HD to 1366x768 screen

[Antoine Martin]

My usecase is scaling down, not up. (Q)HD to 1366x768 screen

Right, in that case you also need #2052 to save tons of network traffic and use a high quality downscaling algorithm.

See also #530.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/2458