Paul Barton-Davis wrote:
>> I need to develop Display window which can a number of coloured layers.
>> ( the various layers used in IC design).
>>
>> Where each layer overlaps another, I want to see the correct ANDING of
>> the colours.
>>
>> I need to be able to repaint with an odd layer removed from display.
>>
>> I can see that if I have multiple pixmaps (one for each layer to be
>> displayed), but just sending the desired pixmaps to the screen I should
>> be able to achieve this.
>
>
> 1) I believe that no part of X (or GDK) current supports such
> things. This generally goes by the name "alpha channel", and X
> doesn't support it. A pixel in a Drawable is either completely
> transparent or completely opaque (with its own particular color).
>
The X Render extension should support these types of operations (with
hardware support, when available). However, you're talking about
bleeding edge (it only just appeared in XFree86 4.0.2) X calls - no
support from GTK+, etc. Check out the release notes and link at
http://www.xfree86.org
Regards,
Tim
_______________________________________________
gtk-list mailing list
[EMAIL PROTECTED]
http://mail.gnome.org/mailman/listinfo/gtk-list
