In <[email protected]> Clemens Eisserer <[email protected]> writes:
>Most likely I will write some XRender documentation as part of my >bachelor thesis. >> In a subsequent thread "2D antialiasing?" on this list, I was bemoaning >> the fact that antialiasing by that method would waste huge amounts of >> bandwidth if the client were separated from the Xserver by some slow >> network, and someone claimed to me, offlist, that Xrender provided >> server-side antialiasing. >> >> So I wanted to verify that claim. Now that this list has pointed me to >> Keith Packard's "The X Rendering Extension", I have done a quick scan of >> that, but can still find no mention of antialiasing. Moreover, that >> describes the protocol, rather than the libXrender interface that is more >> conveniently used to access it, >Yes, that was me ;) >Antialiasing is usually done by transferring the geometry you intend >to render into a mask-pixmap, this can be done with: >- XPutImage (client-side geometry rasterization) >- XRenderAddTraps >and doing a composite operation with that mask. >or by using an implicit mask with: >- XRenderCompositeTrapezoids I can't see any such calls of XRender* functions in the bits of xft that I have been looking at (notably in xftcore.c). >However as far as I know xft already has a XRender aware backend >(using the XRender*Glyphs functions), as well as legacy support for >pre-xrender servers. For sure the Opera/QT combination is not doing anything like that - all the calls that actually pass glyphs to/from the server use good ol' Xlib. Though there is evidence that xft does use Xrender elsewhere in its workings. But who is actually responsible for the development/maintenance of xft? For sure they do not seem to hang around on this list, though I gather they are within the overall Xorg structure somewhere. -- Charles H. Lindsey ---------At Home, doing my own thing------------------------ Tel: +44 161 436 6131 Fax: +44 161 436 6133 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
