create_video_bitmap - Creates a video memory bitmap. Allegro game programming library.

       Allocates  a  video  memory  bitmap  of  the specified size. This can be used to allocate offscreen video
       memory for storing source graphics ready for a hardware accelerated  blitting  operation,  or  to  create
       multiple  video  memory  pages  which  can  then  be  displayed by calling show_video_bitmap().  Read the
       introduction of this chapter for a comparison with other types of bitmaps and other specific details.

       Warning: video memory bitmaps are usually allocated from the same space as the screen bitmap, so they may
       overlap with it; it is therefore not a good idea to use the  global  screen  at  the  same  time  as  any
       surfaces returned by this function.

       create_video_bitmap - Creates a video memory bitmap. Allegro game programming library.

       Returns a pointer to the bitmap on success, or NULL if you have run out of video ram. Remember to destroy
       this bitmap before any subsequent call to set_gfx_mode().

create_bitmap(3alleg4),             create_bitmap_ex(3alleg4),             create_system_bitmap(3alleg4),
       create_sub_bitmap(3alleg4),   destroy_bitmap(3alleg4),    screen(3alleg4),    show_video_bitmap(3alleg4),
       gfx_capabilities(3alleg4),   is_video_bitmap(3alleg4),   clear_bitmap(3alleg4),  clear_to_color(3alleg4),
       ex3buf(3alleg4), exaccel(3alleg4), exflip(3alleg4), exupdate(3alleg4)

Allegro                                           version 4.4.3                     create_video_bitmap(3alleg4)

#include<allegro.h>BITMAP*create_video_bitmap(intwidth,intheight);