Re: How did Gnome/KDE do it?

[Tristan Van Berkom <tristan van berkom gmail com>]

On Tue, 30 Nov 2004 12:03:02 -0800 (PST), G B
<gbpublicemailaddress yahoo com> wrote:
> How did Gnome/KDE make, for example, the linux
> terminal, or any window who's background can be set to
> the desktop (I'm not interested in setting the BG
> image to the desktop in particular, but an arbitrary
> image), and allow scrolling text over that image.
>
> Note, I don't mean tile the background of a text edit
> widget and scroll down the tiles upon which the text
> is permanently place, but actual scrolling text over a
> non-scrolling image.
>
> Hint: I notice that the text scrolling is done line by
> line, not by a single, or arbitrary number of pixels.
> Thanks,

For now, transperency in terminals is a matter of grabing the desktop
image and rendering the text to that, since X composite extentions arent
really available yet ;-)

When rendering labels in Gtk+, labels render directly to the parent window
every time the parent window recieves an expose from the X server... 
So every time the background, the position of the label, or the alignment of
the label changes, the label gets re-rendered.

I'm not entirely sure this answers your question though :-/

Cheers,
                                                     -Tristan