On 06/14/2011 10:30 PM, James Tappin wrote: > I would like to be able to make a code that draws some (possibly very > complex) vector graphics, copies it to an off-screen backing store and > then when an expose-event (Gtk2) or draw signal (Gtk3) is received, > the backing store is copied to the screen rather than doing a complete > redraw of all the vectors which could potentially take several > seconds. Unfortunately all the potential model codes I've been able to > find use the obsolete Gdk Pixmap as backing store.
You may draw to a cairo image surface (instead of a GDK pixmap) then draw that image to a cairo surface (instead of a GTK drawing area.) surface = cairo_image_surface_create(); (vector graphics drawing) cr = gdk_cairo_create(GDK_DRAWABLE(drawing_area->window)); cairo_set_source_surface(cr, surface, dest_x - src_x, dest_y - src_y); cairo_rectangle(cr, dest_x, dest_y, drawing_area_width, drawing_area_height); cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); cairo_fill(cr); cairo_destroy(cr); -- Emmanuel Thomas-Maurin <manutm...@gmail.com> _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org http://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
