On Dienstag 20 Juni 2006 10:24, Claudio Ciccani wrote:
> Stefan Lucke wrote:
> >
> >
> > I would not say that specifying DLOP_ALPHACHANNEL should change the level.
> >
> > With DirectFB the same functionality for two different cards has to be done
> > in two different ways. That's what I don't like. I'm comparing now
> > VIA-unichrome
> > and ATI-radeon. I can show something on the video layer and an OSD. The OSD
> > seems to be on top of the videolayer. OSD is drawn on graphic layer and
> > holds
> > the alpha values for full alpha blending. The argumentation for unichrome
> > was:
> > to get this mode you have to videolayer->Setlevel(-1) [below graphic layer]
> > and
> > enable DLOP_ALPHACHANNEL on graphic layer ;-) .
> >
> >
>
> That's the right way to do that since, after enabling
> DISP_ALPHA_MODE_PER_PIXEL,
> the overlay becomes the underlay and the underlay becomes the OSD.
>
> Another way could be adding a new layer ("Radeon OSD" or "Radeon Subpicture")
> that wraps the primary layer, but I will follow the unichrome approach for
> now.
>
Nice that it works a similar way than unichrome. But I had some difficulties:
It froced that video layer SetLevel(-1) has to be done, _before_
DLOP_ALPHACHANNEL
could be set on graphic primary layer :-( . I guess setting DLOP_ALPHACHANNEL
should only cause an error if config->format has no alpha component independant
of video layer level.
>From radeon_crtc1.c:
if (ovlevel < 0) {
if (config->options & DLOP_ALPHACHANNEL &&
config->format != DSPF_ARGB)
fail |= CLRCF_OPTIONS;
}
else {
if (config->options & DLOP_ALPHACHANNEL)
fail |= CLRCF_OPTIONS;
}
if (failed)
*failed = fail;
return fail ? DFB_UNSUPPORTED : DFB_OK;
--
Stefan Lucke
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