generic shadow improvements

[totaam]

Tracker ticket. See also:

• ms windows shadow server improvements #389: win32

• nvenc support for shadowing on win32 #558: win32 nvenc

• damage events for the posix shadow server #390: posix
• osx shadow server improvements: mdns, keyboard support, etc #391: osx
• allow client side shadow windows to be resized #530: resizing
• FullScreen mode in xpra client #972: fullscreen clients
• fix sound forwarding for osx and win32 shadow servers #1205: sound

Misc:

• think about multi user for all changes, wishlist: Support multiple clients connected at the same time #41
• show the cursor when we're not the ones moving it (and preferably the right one.. without updating the user's current one!)
• detect screensaver and suspend / resume screen updates

[totaam]

2015-08-09 14:51:37: antoine commented

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r10246 speeds things up with X11 shadow servers.
We can still fallback to GTK for capturing the root window pixels using:

XPRA_XSHM=0 xpra shadow ...

win32 and osx shadow servers will need something else to speed things up, hopefully they can implement a fast restride too - if needed at all (see #839).

[totaam]

2016-03-27 05:24:42: antoine commented

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r12231 publishes the server records via mdns on all platforms, using pybonjour on win32 or osx (and on nix if using the XPRA_PREFER_PYBONJOUR=1 env var)

[totaam]

2016-03-27 18:36:48: antoine commented

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Lots of fixes and improvements, including a systray for all shadow servers: r12237, r12238, r12235, r12246.

[totaam]

2016-04-18 07:07:49: antoine commented

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Some information added to ShadowServer

[totaam]

2017-07-06 17:33:43: antoine commented

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Some improvements and fixes, see also #1247 and #1206:

• r16212: sanity checks (will backport)
• r16210: icon handling
• r16209: toggle fullscreen support in client
• fix fullscreen handling #1567 fullscreen

[totaam]

2018-05-03 09:50:29: antoine commented

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Many improvements done as part of #1801 and #1825:

• r19157 + r19168: skip doing damage if the capture instance tells us there are no screen updates
• r19169 + r19177 + r19178 + r19179: refactoring
• r19175: clean the capture instance from the shadow server and not from the window model since multiple models can share the same capture instance

TODO:

• call refresh at a rate closer to the batch delay, if not tied to it
• refactor take_screenshot code (just call get_image on the root window dimensions?)