Message-Id: <200204020324.WAA17558@renoir.op.net>
To: rsteinke@w-link.net
Cc: hunchback@netcabo.pt, gtk-list@gnome.org
Subject: Re: How to set a transparent style? 
In-reply-to: Your message of "Mon, 01 Apr 2002 10:32:46 PST."
             <3CA8A7CE.nailKUI11U84S@w-link.net> 
From: Paul Davis <pbd@Op.Net>
Sender: gtk-list-admin@gnome.org
Errors-To: gtk-list-admin@gnome.org
Precedence: bulk
Date: Mon, 01 Apr 2002 17:25:04 -0500
Status:   

>> From: <hunchback@netcabo.pt>
>>
>> Hi, 
>>
>> i'm doing something that involves GtkDrawingArea, in which i paint
>> some GdkPixmaps, and some of this GdkPixmaps have some
>> transparent areas, the problem is when i paint them, the transparent 
>> areas are painted in white! How do i do so that the transparent areas aren't
> 
>> painted?
>
>The problem is, there is no such thing as a GdkPixmap with a transparent
>area. Transparent pixels are handled by setting the clip mask in the
>graphics context. If you created the pixmap from an xpm, the same function
>which created the pixmap also created the mask you need to use.

this is not *quite* true. you can use gdk_window_shape_combine_mask()
to create genuinely transparent areas without setting the clip mask
for every drawing operation. however, using
gdk_window_shape_combine_mask() is not trivial to do in every case.

--p
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