Hi; On 27 March 2015 at 10:22, Lucas Levrel <llev...@yahoo.fr> wrote:
>>> - draw your "background" on bare_pixmap >>> >>> - when you have to redraw, just copy bare_pixmap to full_pixmap, add >>> stuff >>> to full_pixmap, then display it: >>> >>> gdk_draw_drawable(full_pixmap,copy_gc,bare_pixmap,0,0,0,0,-1,-1); >>> (add stuff to full_pixmap) >>> gdk_draw_drawable(d_area->window, copy_gc, full_pixmap, x, y, x, y, >>> width, >>> height); >>> >>> Where copy_gc has been defined this way: >>> GdkGC *copy_gc=d_area->style->fg_gc[GTK_WIDGET_STATE (d_area)]; >> >> >> This is really GTK+ 2.x only, and even then it's pretty much X11-only. > > > It works in Windows, cross-compiled in Linux with "mxe" (MinGW cross env). It works in Windows because GDK has essentially reimplemented bits of X11 in the Windows backend. :-) In practice, though, it's only as tested as the equivalent X11 concepts, and when they don't match to Windows concepts, that's where bugs lie in wait. >> Pixmaps are really Cairo surfaces, these days, and GCs are Cairo >> contexts. The widget state is part of the GtkStyleContext, and the >> gtk_render_* API substitute the background rendering. Even for GTK+ >> 2.x API you should not be using gdk_draw_* and GdkGC API at all, >> unless your code is supposed to work with GTK+ 2.6. > > > It is supposed to use the latest GTK+ 2 (2.24 I guess). After GTK 2.8, you should be using the Cairo API for everything; some > I'm eager to read a tutorial on GTK2 programming. I think I never found one, > so I'm using the reference manuals, which is a rather tough way to learn > indeed. (gtk-demo doesn't have examples of what I need) You likely won't ever see a GTK 2 programming tutorial that is both up to date and maintained, considering that GTK 2 is in deep maintenance mode, and all the work goes towards developing (and documenting) GTK 3. A good idea of what's needed to make your GTK 2 code use at least the latest API in the 2.x series is to look at the GTK 2.x → 3.x migration guide: https://developer.gnome.org/gtk3/stable/gtk-migrating-2-to-3.html#id-1.6.3.3 This will help you drop the use of deprecated API, like the gdk_draw_* one. Ciao, Emmanuele. -- https://www.bassi.io [@] ebassi [@gmail.com] _______________________________________________ gtk-app-devel-list mailing list gtk-app-devel-list@gnome.org https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
