---------- Original Message ----------
To: Matthew Allen (l...@sydneyband.com.au)
From: Tor Lillqvist (t...@iki.fi)
Subject: Re: gdk_draw_image with alpha compositing on X?
Date: 3/10/2010 4:42:34a
> > I'm calling gdk_draw_image with a 32-bit per pixel image with some
> > pixels having alpha=0 and some with alpha=255, and the transparent
> > pixels come through as black (not surprisingly). What is the correct was
> > to get that on to the screen? (for Win32 and X)
>
> For Windows, you can't do any per-pixel alpha in GTK+, sorry.
> ("patches welcome")
On windows it's EASY to add per pixel alpha for blt'ing, just use the method
AlphaBlend, however on Linux I'm not sure. Should I be going via Cairo to a
client side window? Is that whats supposed to happen? Do the client side
windows get rendered to a backing store in memory somewhere?
And yes, I can patch GTK+ to use AlphaBlend, but I wouldn't know how to
integrate it nicely. Maybe if someone outlines some pseudo code or something I
could go in and hack something up. Or even where I should make mods...
--
Matthew Allen
_______________________________________________
gtk-app-devel-list mailing list
gtk-app-devel-list@gnome.org
http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
