Sent: Saturday, February 07, 2004 6:29 PM Subject: Re: Newbie question, difference between offscreen and onscreen image formats?
> The image formats registered via xf86XVScreenInit are ones that > are exported to the clients. The ones registered via > xf86XVRegisterOffscreenImages are for internal use only. The > idea being that they are the hardware's native overlay format or > formats that can be exposed to other parts of the server such as > a module which uses V4L. Reasons why some formats would be > exposed as client XvImages while they wouldn't be exposed as > OffscreenImages could be: > > * The XvImage formats aren't implemented via the overlay, but > with some texture or blit mechanism. > > * The XvImage formats, though using the overlay, aren't the native > hardware format and require CPU reformating on the copy. > > * There are hardware or software complications related to other > devices bus mastering data into those overlay formats. > > * Simply an oversight, or somebody just didn't get around to > adding them, or didn't have a way to adequetly test them. > > Thanks for the explaination. I know chiip and tech 69000/69030 supports both YUV and RGB overlays. So I guess, all the formats should also be registered as offscreen formats. Any idea what else needs to be changed? Like which functions get called to set/start/stop/capture overlays. Or should I contact one of the chips driver's developer? Suhaib _______________________________________________ Devel mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/devel
