Re: Getting data from a mask

[Paolo Molaro <lupus ximian com>]

On 04/19/01 poyen aleks com wrote:
>  I try to use the shape_combine_mask function, to do some fancy background
> on my own Perl_gtk gnome_applet. On the Gtk_Perl tutorial, I've seen how
> to use the shape_combine_mask with a mask created from an xpm.
> (URL:http://www-zeuthen.desy.de/computing/documentation/perl/gtkperl-tutorial/tut-38.html)
> But now, I would like to get the bitmap or pixmap, the data itself to play
> with it, with Bitmap, or anything else.

You can create your own bitmap or pixmap and draw in it as
appropriate, or you can get a Gtk::Gdk::Image from a drawable
and use the get_pixel/set_pixel on it, if you really want to get
dirty with low-level details. Note that this last is not for the faint
of heart.

> My question is : How can I get the Bitmap, or pixmap data , and not only
> Gtk::Gdk::Pixmap=HASH(0x8209708). How can I get what's inside ?
>
> For those who are wondering why I'm doing that, I've a nice pixmap on my
> gnome panel, and I would like to have a fancy perl_gtk applet on it. So I
> want the applet to be transparent wheter than grey on most pixel possible.
> I think I can do that with shape_combine_mask, but first I need to have a
> mask.

A mask here is simply a Bitmap (that is a 1 bit depth Pixmap).
So, create such a pixmap, draw on it your shape and use it
as the mask. Or use one of the several other cfunctions that
greate a Gtk::Gdk::Bitmap...

lupus

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