[display] Refactor to avoid implicit framebuffer allocation.

include/lib/gfx.h

 /*
  * Copyright (c) 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 85 matching lines @@
 // blend between two surfaces
 void gfx_surface_blend(struct gfx_surface *target, struct gfx_surface *source, uint destx, uint desty);
 
 void gfx_flush(struct gfx_surface *surface);
 
 void gfx_flush_rows(struct gfx_surface *surface, uint start, uint end);
 
 // surface setup
 gfx_surface *gfx_create_surface(void *ptr, uint width, uint height, uint stride, gfx_format format);
 
-// utility routine to make a surface out of a display info
-struct display_info;
-gfx_surface *gfx_create_surface_from_display(struct display_info *);
+// utility routine to make a surface out of a display framebuffer
+struct display_framebuffer;
+gfx_surface *gfx_create_surface_from_display(struct display_framebuffer *) __NONNULL((1));
 
 // free the surface
 // optionally frees the buffer if the free bit is set
 void gfx_surface_destroy(struct gfx_surface *surface);
 
 // utility routine to fill the display with a little moire pattern
 void gfx_draw_pattern(void);
 
 #endif