[cpia] Re: new cpia driver and camstream (fwd)

[Alan Cox]

> Many video hardware can't produce RGB or BGR data directly, so drivers
> usually have to convert from the "native" format (YUV or something
> else). By supporting only BGR, you force anyone who wants or needs RGB
> to convert once more between different formats.

Drivers should never be converting formats. All the known YUV format are
defined. When given an unsupported format a driver should error it.

> usually not that smart. Chromakeying on the wrong format will never
> work, so the next nearest format is not an option.

Indeed