Re: [Linux-fbdev-users] graphic overlay/mixing question

[Unger R. <ric...@te...>]

Hi!

AFAIK what you want is not that easy - blending between two framebuffers =
is not a function that is part of the standard kernel.

Some hardware and framebuffer driver combinations may present the =
different layers supported by the hardware as separate framebuffer =
interfaces (fb0, fb1). In this case fb0 might be the graphics layer, and =
fb1 might be the videolayer. By setting the right parameters in the =
framebuffer driver it may be possible to blend between the layers.

All this depends completely on the hardware though.

A much better option would be to use something like DirectFB - with this =
library you can mix different layers of graphics and video in a flexible =
way, and it operates accellerated on most common hardware. This option =
would require your software to support DirectFB though, so that may not =
be an option.

Richard


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> -----Urspr=FCngliche Nachricht-----
> Von: lin...@li...=20
> [mailto:lin...@li...] Im=20
> Auftrag von Niklas Fondberg
> Gesendet: Dienstag, 27. Juni 2006 16:39
> An: lin...@li...
> Betreff: [Linux-fbdev-users] graphic overlay/mixing question
>=20
> Hi all,
> I have a question that might be off topic but after searching=20
> the net and mailing lists I give in and hope for some help on=20
> this list.
>=20
> I wonder what the best way to mix graphics written to a=20
> framebuffer over decoded video is. I can't change the way the=20
> graphics is written to the device, it has to be directly to a=20
> linux framebuffer device.
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> My hope is that there are some generic way of doing it=20
> without bying a fancy XYZ graphics card but if I must I'll do that.
>=20
> Flow overview:
> userapp -> /dev/fb1
> player -> /dev/fb0
> The graphics would be either with CHROMAKEY transparency=20
> 16bpp or 32 bpp ARGB
>=20
> Kind regards
> Niklas Fondberg
>=20
>=20
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> Lin...@li...
> https://lists.sourceforge.net/lists/listinfo/linux-fbdev-users
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