Re: [Linux-fbdev-devel] Re: fbdev, console, (video) overlay/underlay & fbtv

[Sven <lu...@dp...>]

On Wed, Jul 11, 2001 at 04:35:07PM +0200, Romain Dolbeau wrote:
> > >       __u16 blend_factor;             /* blending factor */
> > 
> > add chroma key (rage) here ?
> 
> The problem is, how to handle the mix between the overlay
> and the console layer. If the FB doesn't have an alpha
> channel (CI8, RGB565), one must use a color key. So one

I think that the rage (and maybe mga also from the mga Xv driver) can only
support color keyed overlay, not alpha keyed overlay. I think this comes
because they use a packed representation anyway (24 bpp), but i could be wrong.

> So I simply dodged the problem by saying, we display
> the overlay in its area blended (0 to 100%) with
> the current display. But we need a better way,
> obviously.

Yes, we need something better and more open here.

Friendly,

Sven Luther