[Libdlo] libdlo performance and visual artifacts?

[Bernie Thompson]

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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