From: Mike Durham <mdurham@...>
Date: 2006-11-11T09:00:08+09:00
Subject: Linux Cairo, webcam displaying images

G'day
Can anyone please advise me on how to constantly display the output from 
a webcam using Ruby & Cairo?
I can operate the webcam, write images to disk etc and I can display a 
Gdk::Pixbuf  okay. It's just the updating of an image on the screen that 
I'm missing.

The data returned from V4l is a ruby 'string' but how do I display it? 
At first I thought to display a blank Gdk::Pixbuf of correct size 
(640x480) and constantly modify it's buffer but I think this might not 
be possible from within Ruby???

====
 From the Ruby-Gnome2 site it says:
Gdk::Pixbuf.new(colorspace, has_alpha, bits_per_sample, width, height)
     Creates a new Gdk::Pixbuf and allocates a buffer for it. The buffer 
has an optimal rowstride. Note that the buffer is not cleared; you will 
have to fill it completely yourself. Raises an...
====

note "you will have to fill it completely yourself" how is this achieved 
in Ruby?

Any help would be most welcome.

Cheers, Mike