winsys: Drop xlib_get_visual_info from the vtable

We don't need the hack any more; CoglRenderer has the appropriate API
for the Xlib-based winsys backends.

cogl/winsys/cogl-winsys-egl-x11.c

@@ -687,24 +687,6 @@ _cogl_winsys_egl_cleanup_context (CoglDisplay *display)
     }
 }
 
-/* XXX: This is a particularly hacky _cogl_winsys interface... */
-static XVisualInfo *
-_cogl_winsys_xlib_get_visual_info (void)
-{
-  CoglDisplayEGL *egl_display;
-
-  _COGL_GET_CONTEXT (ctx, NULL);
-
-  _COGL_RETURN_VAL_IF_FAIL (ctx->display->winsys, FALSE);
-
-  egl_display = ctx->display->winsys;
-
-  if (!egl_display->found_egl_config)
-    return NULL;
-
-  return get_visual_info (ctx->display, egl_display->egl_config);
-}
-
 #ifdef EGL_KHR_image_pixmap
 
 static CoglBool
@@ -851,8 +833,6 @@ _cogl_winsys_egl_xlib_get_vtable (void)
       vtable.onscreen_x11_get_window_xid =
         _cogl_winsys_onscreen_x11_get_window_xid;
 
-      vtable.xlib_get_visual_info = _cogl_winsys_xlib_get_visual_info;
-
 #ifdef EGL_KHR_image_pixmap
       /* X11 tfp support... */
       /* XXX: instead of having a rather monolithic winsys vtable we could

cogl/winsys/cogl-winsys-glx.c

@@ -2078,29 +2078,6 @@ _cogl_winsys_onscreen_set_resizable (CoglOnscreen *onscreen,
   XFree (size_hints);
 }
 
-/* XXX: This is a particularly hacky _cogl_winsys interface... */
-static XVisualInfo *
-_cogl_winsys_xlib_get_visual_info (void)
-{
-  CoglGLXDisplay *glx_display;
-  CoglXlibRenderer *xlib_renderer;
-  CoglGLXRenderer *glx_renderer;
-
-  _COGL_GET_CONTEXT (ctx, NULL);
-
-  _COGL_RETURN_VAL_IF_FAIL (ctx->display->winsys, FALSE);
-
-  glx_display = ctx->display->winsys;
-  xlib_renderer = _cogl_xlib_renderer_get_data (ctx->display->renderer);
-  glx_renderer = ctx->display->renderer->winsys;
-
-  if (!glx_display->found_fbconfig)
-    return NULL;
-
-  return glx_renderer->glXGetVisualFromFBConfig (xlib_renderer->xdpy,
-                                                 glx_display->fbconfig);
-}
-
 static CoglBool
 get_fbconfig_for_depth (CoglContext *context,
                         unsigned int depth,
@@ -2714,7 +2691,6 @@ static CoglWinsysVtable _cogl_winsys_vtable =
     .context_init = _cogl_winsys_context_init,
     .context_deinit = _cogl_winsys_context_deinit,
     .context_get_clock_time = _cogl_winsys_get_clock_time,
-    .xlib_get_visual_info = _cogl_winsys_xlib_get_visual_info,
     .onscreen_init = _cogl_winsys_onscreen_init,
     .onscreen_deinit = _cogl_winsys_onscreen_deinit,
     .onscreen_bind = _cogl_winsys_onscreen_bind,

cogl/winsys/cogl-winsys-private.h

@@ -145,11 +145,6 @@ typedef struct _CoglWinsysVtable
   int
   (*onscreen_get_buffer_age) (CoglOnscreen *onscreen);
 
-#ifdef COGL_HAS_XLIB_SUPPORT
-  XVisualInfo *
-  (*xlib_get_visual_info) (void);
-#endif
-
   uint32_t
   (*onscreen_x11_get_window_xid) (CoglOnscreen *onscreen);