[Wayland-bugs] [Bug 729215] New: Please implement Wayland subsurfaces

[gtk+ (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729215
  gtk+ | Backend: Wayland | 3.13.x

           Summary: Please implement Wayland subsurfaces
    Classification: Platform
           Product: gtk+
           Version: 3.13.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: Backend: Wayland
        AssignedTo: gtk-bugs at gtk.org
        ReportedBy: tarnyko at tarnyko.net
         QAContact: gtk-bugs at gtk.org
                CC: rob at robster.org.uk, wayland-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=275441)
 --> (https://bugzilla.gnome.org/attachment.cgi?id=275441)
gdkwayland-subsurfaces.diff

In order to provide the same level of functionalities with GDK-Wayland that we
have with GDK-X11/Win32, we need a way to draw in a GTK+ window using an
external backend (such as OpenGL, SDL...) and keep the drawing area consistent
in terms of location, size... as we move the GTK+ window around.

Real-world examples : GL application (GtkGLgears), media players, video games.

Wayland subsurfaces allow that. Please consider this patch, which implements
this workflow :

gdk_wayland_window_set_use_custom_subsurface (window, <x>, <y>);

struct wl_surface *surf = gdk_wayland_window_get_subsurface (window).

 *and draw to the wl_surface


(PS : it has been said it would be possible to achieve that functionality by
other means ; that needs more details, though).

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