Sorry, I thought I had sene this weeks ago, but siddenly found it still in my Drafts folder.
On Mon, 15 Dec 2008 20:09:14 -0000, Clemens Eisserer <[email protected]> wrote: >> Indeed, but that means you need to assemble all your stuff in huge >> Pixmaps >> at the application level, and then pass them over to the Xserver. But if >> your application is separated from the Xserver by some (possibly slow) >> network, then that is a lot of network traffic. > No, Pixmaps server-side. So the only thing that changes are that > another XID for you rendering commands is sent (the pixmap instead of > the window) and additional XCopyArea-commands sent over the network. > One such call is about ~40 bytes. True, and when you are _not_ doing antialiassing, the various Pixmaps you create are sent to the server, and are then XCopyArea-ed to the genuine window without ever leaving the Xserver again - at least, that is what should happen if the implementor does his job properly. But with antialiassing, you can easily land up creating lots of (possibly large) Pixmaps (which get sent to the server) whose only purpose in life is to get brought back again using XGetImage so that you can perform the antialiassing in the application program and use XPutImage to put them into the real window (or maybe to another Pixmap). Those temporary Pixmaps then get deleted (but you still use up a helluvalot of Pixmap IDs that way). That might well be poor implementation, but it sure happens. The Opera browser is a notable example (see my earlier thread on Xft Woes), though whether it is Opera's fault or QT's fault I do not yet know. I also have my suspicions concerning Adobe acroread. -- Charles H. Lindsey ---------At Home, doing my own thing------------------------ Tel: +44 161 436 6131 Web: http://www.cs.man.ac.uk/~chl Email: [email protected] snail: 5 Clerewood Ave, CHEADLE, SK8 3JU, U.K. PGP: 2C15F1A9 Fingerprint: 73 6D C2 51 93 A0 01 E7 65 E8 64 7E 14 A4 AB A5 _______________________________________________ xorg mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/xorg
