Hi. There are several problems with this, as implemented, and now that I think about the problem in more detail, I am remembering some of the reasons why I implemented ALR on the server side. Probably the biggest reason is what I call the "blinking cursor dilemma." There are some ill-behaved window managers out there that continuously update their taskbar widgets using small XCopyArea operations, and similarly, if you have a console window open, it will create a similar phenomenon because of the blinking cursor. Thus, the default ALR behavior is currently to only make PutImage() operations eligible for ALR, and the only way to do that is to hook into the PutImage handler in the server-side VNC code. Additionally, ALR maintains a list of tiles and only sends lossless updates for the ones that were previously sent using JPEG. That could potentially be done from the client side as well, but it would be problematic on high-latency networks, because it would require a round trip (potentially several, because we might have to send a new framebuffer update request for each JPEG tile for which we're requesting a lossless copy.)
I'm being paid to come up with an automatic lossless refresh solution for TigerVNC, so I'll be revisiting some of these assumptions over the next few months. At the moment, my inclination is to leave TurboVNC as-is. On 5/12/11 5:07 AM, Arthur Huillet wrote: > Hi, > > The attached patch implements ALR, based on a Xt timeout that is reset after > each framebuffer update. > > I have added -alrjpeg to enable use of JPEG Q95 for "ALR", because in some > cases I do not want to use truly lossless (low bandwidth). > > If you're happy, please apply. > > Next in line: add both options to the F8 menu, and factorize the code with the > "request ALR" feature. > ------------------------------------------------------------------------------ vRanger cuts backup time in half-while increasing security. With the market-leading solution for virtual backup and recovery, you get blazing-fast, flexible, and affordable data protection. Download your free trial now. http://p.sf.net/sfu/quest-d2dcopy1 _______________________________________________ VirtualGL-Devel mailing list VirtualGL-Devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/virtualgl-devel
