[maemo-developers] Can GTK+ make use of XSHM extension from MIT

[From: Gustavo Sverzut Barbieri]

On Jan 12, 2008 8:08 AM, Ross Burton <ross at burtonini.com> wrote:
> On Sat, 2008-01-12 at 09:51 +0800, Bin Chen wrote:
> > OK, from the thread above I have point out the main purpose of me to
> > start this thread is I want to write a video player in a slow machine,
> > I have tested the X and framebuffer case that the difference is large,
> > so I am going to find the root cause so I can make the two results
> > closer.
>
> As has been said, have a look at the Xvideo extension which is designed
> explicitly for video playback.

Yes, I'll second Ross and others here: try XV extension. Probably
you'll have your video frames not in RGB, but in some other, more
convenient color space like YUV, in that case if you don't use XV you
have to YUV->RGB on your app, BUT if you use XV then you can request
this extension to use hardware converter for you, this means you'll
have 2 benefits: 1) not use CPU to convert and 2) use less bandwidth
as YUV is usually lighter than RGB (less bits per pixel).
   If you're using Maemo, then you'll also face the problem with the
huge screen resolution, I'd recommend you to use double pixel
features.

In the toolkit area, I'd made my marketing on EFL (Enlightenment
Foundation Libraries), that I ported and optimized to Maemo. It has a
special engine for 16bpp using XSHM. It automatically handles some
drawing optimizations, like eliminating overlapping dirty rectangles
(breaking then in non-overlapping, drawing less)... Well, I had to do
this marketing, but maybe for the video window it will not help at
all.

BTW, did you consider using Gstreamer or MPayer for this task? They
all have optimized means to output video.

-- 
Gustavo Sverzut Barbieri
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