[libcaca] What is pitch?

[Zeeshan Ali <zeelists@yahoo.com>]

Hello everyone,
  Mr. Sam or anyone else: can you please explain what
'pitch' means in context to libcaca? I thought of it
as 
s the number of bytes in a row & therefore defined it
as:  image_width * bpp/8. Then i saw this formula in
the vlc's libcaca plugin: ((image_width + 15) & ~15)
which is not understandable for me. Thanks in advance.
Bye. 


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