Re: XForms: Pixmap Transparency

francois bourcier (Francois.Bourcier@epita.fr)
Wed, 18 Jun 1997 11:34:24 +0000 (GMT)

To subscribers of the xforms list from francois bourcier <Francois.Bourcier@epita.fr> :

Hello ! In a previous mail, our friend Dr. T.C. Zhao said :

-=)> > I would ask you for a sample code to set the GCs for transparent
-=)> > Pixmaps because fl_read_pixmapfile doesn't do it while It's OK for
-=)> > PixmapButtons
-=)>
-=)> As the document says, the parameter shape_mask is the clipping
-=)> mask that should be used for transparency. To set
-=)> the cliping mask in a GC, use XSetClipMask(display, gc, shape_mask)
-=)> then use this gc to show your pixmap.
-=)>

Yes, the documentation says that, but that is not the problem .
I know I have to set a shape_mask.
But how do you know the pixmapfile transparent color (if there's one), if
you do not already know it ?

This may not be long but I merely don't know.

Thanks.

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