[Libva] Filling background pixels with YUV values

[Xiang, Haihao]

Thanks, Jon.

> Thank you for the information, Haihao. I have filed this feature
> request in bugzilla.
>  
> https://bugs.freedesktop.org/show_bug.cgi?id=99193
>                                                                      
>  
> Jon
>  
> -----Original Message-----
> From: Xiang, Haihao 
> Sent: Friday, December 23, 2016 12:55 AM
> To: Recker, Jon <jon.recker at intel.com>; libva at lists.freedesktop.org
> Subject: Re: [Libva] Filling background pixels with YUV values
>  
>  
> Hi Jon,
>  
> VA-API doesn't support YUV background color. If you want to have this
> feature, I suggest you file a bug with severity set to enhancement in
> the bugzilla to track your requirement. We may consider to add this
> new feature in a future version.
>  
> Thanks
> Haihao
>  
> > Hello.
> >  
> > When composing several sources into a single output surface, we can
> > specify the color of the background pixels using
> > VAProcPipelineParameterBuffer::output_background_color. According
> to
> > the documentation, this background color must be a 32-bit ARGB
> value.
> >  
> > But when the output is a non-RGB format (for example, NV12) it
> would
> > be helpful if we could set the background color to a constant YUV
> > value instead. Does libva provide any method to do this?
> >  
> > I have tried converting the desired YUV background color to RGB,
> then
> > setting output_background_color to this RGB value. When the final
> > picture is processed, the background color is converted back to YUV
> > automatically. But the final background color does not necessarily
> > match the requested value, for example when one of the RGB channels
> is
> > clipped to fit in the range [0,255].
> >  
> > A workaround would be to create a separate full-size NV12 surface
> and
> > fill it with the desired background color, but for performance
> reasons
> > it is preferable to avoid this. Any suggestions would be very much
> > appreciated. Thanks.
> >  
> > Jon
> >  
> > _______________________________________________
> > Libva mailing list
> > Libva at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/libva