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fli_bmp_dirty_from(3)		Allegro	manual		 fli_bmp_dirty_from(3)

NAME
       fli_bmp_dirty_from,  fli_bmp_dirty_to - Indicate	which parts of the im-
       age have	changed. Allegro game programming library.

SYNOPSIS
       #include	<allegro.h>

       extern int fli_bmp_dirty_from;

       extern int fli_bmp_dirty_to;

DESCRIPTION
       These variables are set by next_fli_frame() to indicate which  part  of
       the  fli_bitmap	has  changed  since  the  last call to reset_fli_vari-
       ables().	If fli_bmp_dirty_from is greater  than	fli_bmp_dirty_to,  the
       bitmap	has   not   changed,  otherwise	 lines	fli_bmp_dirty_from  to
       fli_bmp_dirty_to	(inclusive) have altered. You can use these when copy-
       ing the fli_bitmap onto the screen, to avoid moving data	unnecessarily.
       Example:

	  if (fli_bmp_dirty_from <= fli_bmp_dirty_to)
	     blit(fli_bitmap, screen, 0, fli_bmp_dirty_from,
		  0, fli_bmp_dirty_from, fli_bitmap->w,
		  fli_bmp_dirty_to - fli_bmp_dirty_from	+ 1);

SEE ALSO
       fli_bitmap(3), reset_fli_variables(3)

Allegro				 version 4.4.2		 fli_bmp_dirty_from(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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