Hello all, I have noticed a few oddities regarding the cairo_t* that is passed by gdk_cairo_create and I was wondering whether you could give me some pointers. I have given a sort of canvas with strokes drawn onto it. The canvas is stored as a cairo_surface_t* in the application. On a normal expose event I merely copy the surface back to the widget. Now assume that the user wants to draw an additional stroke on the canvas. During the drawing there will be multiple motion_notify_event being triggered. To avoid modifying the internal cairo_surface_t* and copying that to the screen I would like to simple draw on top of the widget using the cairo_t* provided by gdk_cairo_create. However, the drawing does not seem to work correctly when transparency is involved: any semi-transparent stroke does not appear at all on the screen and anti-aliased strokes are drawn differently than when they are drawn onto the internal cairo_surface_t*. Does anyone have a good explanation for this behaviour and is there some way to avoid it without having to copy buffers around? Where does the cairo_t* provided by gdk_cairo_create come from and how is it combined with the previously drawn content? ax487 _______________________________________________ gtk-list mailing list gtk-list@xxxxxxxxx https://mail.gnome.org/mailman/listinfo/gtk-list
