On 13-04-10 10:44, Michel Dänzer wrote:
On Mon, 2010-04-12 at 07:54 +0200, Matthew Fincham wrote:
I am trying to display scaled video with text and pixmaps (amongst other
things) "overlayed". I have Xv working, but when the overlay (to be
clear, this is not an Xv overlay) is drawn the overlay flickers. So I
need use Xv, but with double buffering.
My first attempt was to use Xv to draw to a pixmap instead of a window,
only to find out that Xv does not support this (at least it looks like
the Intel driver doesn't support this).
See https://bugs.freedesktop.org/show_bug.cgi?id=21143 . It shouldn't be
too hard to finish up the patches floating around for this, someone just
needs to do it
Hi Michel
Thank you for the reply - I appreciate the response. I have actually
already seen this patch and applied it, but this is what I found:
- After applying the patch the request to display the XvImage results
in a BadMatch error. This error is generated by the modification to
xvmain.c that checks the drawable and adaptor type match.
- Leaving this check out results in X freezing.
- After checking the Intel driver I see that it is responsible for
setting the Xv adaptor type. Forcing it to be a pixmap also results in X
freezing (not surprisingly!)
Looking at xf86XVPutImage in xf86xv.c it looks like it relies on the
drawable being a Window, and simply removing the check that the drawable
is a Window (which is what the patch does) is not sufficient.
So I can see two issues:
- the Intel driver needs to export the adaptor type with XvPixmapMask
flag (or both XvPixmapMask and XvWindowMask flags, although I am not
sure if these are exclusive)
- Xorg needs to deal with the drawable not being a Window (in xf86xv.c)
Does anyone know if firstly, this is even possible, and secondly, how to
go about doing this if it is possible. I am happy to do it and test it,
but I am going to need some guidance (!).
Thanks again to anyone taking the time to read this.
Matthew Fincham
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