sdl2: set window ID

This uses the console API to record the window ID of the SDL2 windows.
Signed-off-by: NSamuel Thibault <samuel.thibault@ens-lyon.org>
Message-id: 20161221003806.22412-4-samuel.thibault@ens-lyon.org
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/sdl2.c

@@ -761,6 +761,7 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
     uint8_t data = 0;
     char *filename;
     int i;
+    SDL_SysWMinfo info;
 
     if (no_frame) {
         gui_noframe = 1;
@@ -786,6 +787,8 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
         exit(1);
     }
     SDL_SetHint(SDL_HINT_GRAB_KEYBOARD, "1");
+    memset(&info, 0, sizeof(info));
+    SDL_VERSION(&info.version);
 
     for (i = 0;; i++) {
         QemuConsole *con = qemu_console_lookup_by_index(i);
@@ -813,6 +816,10 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
 #endif
         sdl2_console[i].dcl.con = con;
         register_displaychangelistener(&sdl2_console[i].dcl);
+
+        if (SDL_GetWindowWMInfo(sdl2_console[i].real_window, &info)) {
+            qemu_console_set_window_id(con, info.info.x11.window);
+        }
     }
 
     /* Load a 32x32x4 image. White pixels are transparent. */