[Glade-users] transparent pixmap

[Jachym Cepicky]

Hallo,

maybe a bit offtopic, but I'll try: How to make transparent pixmaps?

Task: I need to display 2 layers in gtk.DrawingArea:

    1 - background PNG file
    2 - drawings over this file

for 1, I use 
    pixbuf =  gtk.gdk.pixbuf_new_from_file(tmpPpmFile)

for 2, I use

    pixmap.draw_line(...)

When I call 

    drawingarea.window.draw_pixbuf(...,pixbuf,0,0,0,0,.....)
    drawingarea.window.draw_drawable(..., pixmap, ....)

The area appears black. Places, which should be transparent, are just
black :-(

How would you perform this task?

Thanks for hints

Jachym
-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
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