On Mon, 11 Nov 2002, Luugi Marsan wrote: > The current implementation of Overlay for the G450 seem to write the > 8bpp image by placing the pixel value at the top byte of each pixel. > Then the G450 takes care of doing the overlay by specifying to the card > the pixel configuration. If I wanted to have the overlay suface draw on > an separate surface, how would I do that?
The best solution might require writing support in the server, but here is some other brain-storming: At some level pretend it is a different head. Since it is an overlay X doesn't *have* to know that it is related to the underlay (although it would defeat obscured window optimizations). Use a shadow framebuffer, and blit into the 8bit framebuffer. You can probably do better by drawing directly into the 8bit fb, pretending it is pixmap in video memory, but shadow may be easier. XV does overlays; is it useful to use video memory as an XV source ? (I don't know much about XV) I think that (some of the) C&T hardware (using the chips driver) have this cabability. I may be confusing it with another manufacturer (S3?) and I don't know whether we ever supported it. This might be productive lead, or it may be a red herring. -- Dr. Andrew C. Aitchison Computer Officer, DPMMS, Cambridge [EMAIL PROTECTED] http://www.dpmms.cam.ac.uk/~werdna _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
