On Wed, 29 Feb 2012, jcup...@gmail.com wrote:
You need a compositing model instead. Your draw window should be a stack of 2D layers. In your expose callback, paint that part of the window back to front. Do rubberbanding by creating a temporary top layer with the rubber band in and queueing refresh events for the pixels it touches as it moves. Very simple, reasonably efficient, easy to make flicker-free with gtk's automatic double-buffering.
Hi John, thanks for the followup. Excuse my deep ignorance on the topic but I'm just beginning to look into GTK/GDK/Cairo. Does the v2 release of this whole bundle include explicit support for the layering approach you describe, or are you talking about my code having to maintain this knowledge on its own (presumably by maintaining two separate drawing surfaces, with the primary image in one and my quasi-rubberband overlays in another), and explicitly overlaying them myself? What about the v3 release?
Thanks! Roger _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
