php man page for create_bitmap

create_bitmap(3alleg4)						  Allegro manual					    create_bitmap(3alleg4)

NAME
       create_bitmap - Creates a memory bitmap. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       BITMAP *create_bitmap(int width, int height);

DESCRIPTION
       Creates	a memory bitmap sized width by height. The bitmap will have clipping turned on, and the clipping rectangle set to the full size of
       the bitmap. The image memory will not be cleared, so it will probably contain garbage: you should clear the bitmap before  using  it.  This
       routine	always	uses  the  global pixel format, as specified by calling set_color_depth().  The minimum height of the BITMAP must be 1 and
       width can't be negative.  Example:

	  /* Create a 10 pixel tall bitmap, as wide as the screen. */
	  BITMAP *bmp = create_bitmap(SCREEN_W, 10);
	  if (!bmp)
	     abort_on_error("Couldn't create bitmap!");
	  /* Use the bitmap. */
	  ...
	  /* Destroy it when we don't need it any more. */
	  destroy_bitmap(bmp);

RETURN VALUE
       Returns a pointer to the created bitmap, or NULL if the bitmap could not be created. Remember to free this bitmap  later  to  avoid  memory
       leaks.

SEE ALSO
       create_bitmap_ex(3alleg4),    create_sub_bitmap(3alleg4),    create_video_bitmap(3alleg4),    create_system_bitmap(3alleg4),   destroy_bit-
       map(3alleg4), set_color_depth(3alleg4), is_memory_bitmap(3alleg4), clear_bitmap(3alleg4), clear_to_color(3alleg4)

Allegro 							   version 4.4.2					    create_bitmap(3alleg4)