Indicate which parts of the image have changed.


extern int fli_bmp_dirty_to;
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_variables(). 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 copying 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);

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