[Libdlo] libdlo performance and visual artifacts?

[Hochmuth, Roland M]

Hi Bernie, Thanks for the info! I'm looking forward to the improvements. The pixel format I'm using for the bitmap is argb8888. I wouldn't have expected a colorspace conversion with that format as the frame-buffer is 24 bpp so rgb just get compacted differently, but no color space conversion required. Regards --Roland

> -----Original Message-----
> From: bernie.thompson at gmail.com [mailto:bernie.thompson at gmail.com] On
> Behalf Of Bernie Thompson
> Sent: Tuesday, July 07, 2009 3:42 PM
> To: Hochmuth, Roland M
> Cc: libdlo at lists.freedesktop.org
> Subject: Re: [Libdlo] libdlo performance and visual artifacts?
> 
> Hi Roland,
> 
> The performance differences are expected at this time -- the initial
> release of libdlo is quite unoptimized, and we've fallen behind on
> getting all the planned updates into it.  Work from Roberto and others
> on the drivers (the main one being the Linux kernel framebuffer driver
> - udlfb) have surpassed libdlo. Which in a way that's not too bad,
> because the most common end-user scenario (Linux Framebuffer & X
> Server on top of it) is also the one that's most progressed.
> 
> But in general, there are plenty of further opportunities for
> optimization, as everything is early/rough right now.
> 
> On the color banding -- that sounds like a straight bug, possibly in
> one of the colorspace conversions (or 24->16).  Which DLO_PIXFMT are
> you using?
> 
> Thanks,
> Bernie
> 
> On Tue, Jul 7, 2009 at 11:52 AM, Hochmuth, Roland
> M<roland.hochmuth at hp.com> wrote:
> > Libdlo, I've been doing some experiments with libdlo. The primary
> test case
> > is using dlo_copy_host_bmp. I'm only measuring a few 1280x1024 blts
> per
> > second. You can see the blt "paint" to the screen. Additionally, the
> display
> > has several different visual artifacts including vertical banding of
> colors
> > and flickering/speckles. For example, on what is suppose to be mostly
> a
> > white image, there are areas where the colors show a banding between
> white
> > and an off white color. I'm using Ubuntu 9.04 64 bit with both the
> 0.1
> > release and code from the git repo and it the results are the same.
> I'm
> > using the HP USB Graphcis Adapter. I've tried several different LCD
> monitors
> > and a CRT monitor thinking that there might be some sort of video
> sync
> > issue, but the results are the same everywhere. In comparison to
> another
> > system that has been set-up with the X drivers, the X Drivers are
> much
> > faster and the display fidelity is excellent. I'm just wondering if
> this is
> > expected at this time or do you think that there might be some system
> > related issue and have some suggestions that I could follow-up on?
> Regards
> > --Roland
> >
> >
> >
> >
> >
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