[display] Refactor to avoid implicit framebuffer allocation.

lib/text/text.c

 /*
  * Copyright (c) 2008-2010 Travis Geiselbrecht
  *
  * Permission is hereby granted, free of charge, to any person obtaining
  * a copy of this software and associated documentation files
  * (the "Software"), to deal in the Software without restriction,
  * including without limitation the rights to use, copy, modify, merge,
  * publish, distribute, sublicense, and/or sell copies of the Software,
  * and to permit persons to whom the Software is furnished to do so,
  * subject to the following conditions:
@@ skipping 58 matching lines @@
     list_add_head(&text_list, &line->node);
 
     text_update();
 }
 
 /**
  * @brief  Refresh the display
  */
 void text_update(void)
 {
-    struct display_info info;
-    if (display_get_info(&info) < 0)
+    struct display_framebuffer fb;
+    if (display_get_framebuffer(&fb) < 0)
         return;
 
     /* get the display's surface */
-    gfx_surface *surface = gfx_create_surface_from_display(&info);
+    gfx_surface *surface = gfx_create_surface_from_display(&fb);
 
     struct text_line *line;
     list_for_every_entry(&text_list, line, struct text_line, node) {
         const char *c;
         int x = line->x;
         for (c = line->str; *c; c++) {
             font_draw_char(surface, *c, x, line->y, TEXT_COLOR);
             x += FONT_X;
         }
     }
 
     gfx_flush(surface);
 
     gfx_surface_destroy(surface);
 }