gui_set_screen

Changes the bitmap surface GUI routines draw to.

Description

void gui_set_screen(BITMAP *bmp);
This function can be used to change the bitmap surface the GUI routines draw to. This can be useful if you are using a double buffering or page flipping system. Passing NULL will cause the default surface (screen) to be used again. Example: 
      BITMAP *page[2];



      /* Allocate two pages of video memory */
      page[0] = create_video_bitmap(SCREEN_W, SCREEN_H);
      page[1] = create_video_bitmap(SCREEN_W, SCREEN_H);



      /* Page flip */
      show_video_bitmap(page[0]);
      gui_set_screen(page[0]);
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