Re: [GTKMM] Standalone pixmap

[Rob Benton <rob benton conwaycorp net>]

Mateusz 'vArDo' Bilinski wrote:
> Hello.
> Is is possible to create a pixmap not connected with any drawable
> (pixmap nor window). I want to have to draw on in separately and later
> redraw some of it to a pixmap connected with window. Some like this
> below does not work:
>
> Glib::RefPtr<Gdk::Pixmap> rpPixmap = Gdk::Pixmap::create(
>       0,
>       2,
>       2,
>       -1);
>
>
> The declaration of this static method is:
>
> Glib::RefPtr<Pixmap> create (const Glib::RefPtr<Drawable>& drawable, int
> width, int height, int depth=-1)
>
> In a comment to Gdk::Drawable::draw_pixbuf there is written:
>
> The destination drawable must have a colormap. All windows have a
> colormap, however, pixmaps only have colormap by default __if_they_were
> created_with_a_non-0_window_argument. Otherwise a colormap must be set
> on them with Gdk::Drawable::set_colormap().
>
> So I suppose it is possible to do what I want. The question is how.
>
> Thanks for any suggestions in advance.
>
> vArDo
>
>
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Passing a Gdk::Drawable into the Gdk::Pixmap::create() method does not 
associate it or anything like that.  All it does is set the Pixmap's 
depth to that of the Gdk::Drawable you passed in.

If I'm wrong someone please correct me.  I looked at the Gtk 
"gdk_pixmap_new()" function for this info.