how can I create a pixmap with transparent background ?

["Dorin Huzum" <huzzy mymail ro>]

I have the fowlling code and I need that the backgroud for the pixmap pixul to be transparent.

pixul=gdk_pixmap_new(widget->window,20,20,-1);			
gdk_draw_arc(pixul,gc[0],FALSE,0,0,20,20,0,64*360);

.....

gdk_draw_drawable(widget->window,gc[0],pixul,0,0,p_x-10,p_y-10,21,21);	

Tks.

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