On Thursday 31 January 2008 10:46, Jamie Lokier wrote: > Anthony Liguori wrote: > > VGA framebuffer operations come in as memory operations. They're > > tracked by watching what memory gets dirtied. This can only operate at > > a page-granularity so this results in scan-line granularity updates. > > The VNC front-end goes to great lengths to keep a shadowed framebuffer > > and reduce these updates to a smaller update region. You could possibly > > look at refactoring that code. However... > > That update region code should probably be moved to something generic > and made into a generic display option. > > Reducing update region is logically orthogonal, and could work with > any update method (e.g. local X11, remote X11, local X11-OpenGL, > remote X11-OpenGL, SDL etc.). With some of those, for some people > (especially some but not all remote setups) it might be worth it.
For exactly these reasons I developed a shadow framebuffer patch which ... > makes QEMU's graphics emulation much more usable over remote > X connections, by reducing the amount of data sent to the X server. > This is particularly noticeable for small display updates, most > importantly mouse cursor movements, which become faster and so > generally make the guest's GUI more pleasant to use. See http://lists.gnu.org/archive/html/qemu-devel/2007-03/msg00141.html for the patch and short associated thread. It never got included, though. J
