On Thu, 17 Feb 2005 00:09:59 +0100, Attila Kinali <[EMAIL PROTECTED]> wrote: > On Thu, 17 Feb 2005 01:17:47 +0800 > "HiNet" <[EMAIL PROTECTED]> wrote: > > > Just as Nicolai said, everything can be done with 3D hardware > > function of graphics cards. And if I am correct, only ATI's graphic > > chips can support both 3D and colorkey in the same time. Hence, > > we can do some OSD by using the feature of colorkey if we use > > ATI's card. However, ATI does not support 16 bit color mode in > > their close source driver for linux. Besides, some uncompressed > > video streams are in YUV space. > > Actualy, YUV is the most used colorspace for video applications. > One reason is because it decorelates the three colour planes > quite efficiently and the other is that you can use > supsampling because of this decorelation. > In the extreme case with 4:2:0 you effectively half > the amount of raw data per frame. > That's why a converter is a must have, but i don't think > that's too difficult, it's iirc 9 multipliers with > constant multipicants and 6 adders. Shoudln't need too > many gates.
It's not even that bad. Some of the multiplies are trivial. Like multiplying by 129 is just an adder. _______________________________________________ Open-graphics mailing list [email protected] http://lists.duskglow.com/mailman/listinfo/open-graphics List service provided by Duskglow Consulting, LLC (www.duskglow.com)
