opendarwin man page for is_linear_bitmap

is_linear_bitmap(3alleg4)					  Allegro manual					 is_linear_bitmap(3alleg4)

NAME
       is_linear_bitmap - Tells if a bitmap is linear. Allegro game programming library.

SYNOPSIS
       #include <allegro.h>

       int is_linear_bitmap(BITMAP *bmp);

DESCRIPTION
       Returns	TRUE if bmp is a linear bitmap, i.e. a bitmap that can be accessed linearly within each scanline (for example a memory bitmap, the
       DOS VGA or SVGA screen, Windows bitmaps, etc). Linear bitmaps  can  be  used  with  the	_putpixel(),  _getpixel(),  bmp_write_line(),  and
       bmp_read_line() functions.

       Historically there were only linear and planar bitmaps for Allegro, so is_linear_bitmap() is actually an alias for !is_planar_bitmap().

SEE ALSO
       is_planar_bitmap(3alleg4), is_memory_bitmap(3alleg4)

Allegro 							   version 4.4.2					 is_linear_bitmap(3alleg4)