/* atlc - arbitrary transmission line calculator, for the analysis of
transmission lines are directional couplers. 

Copyright (C) 2002. Dr. David Kirkby, PhD (G8WRB).

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either package_version 2
of the License, or (at your option) any later package_version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
USA.

Dr. David Kirkby, e-mail drkirkby at ntlworld.com 

*/
#include "config.h"

#ifdef HAVE_STRING_H
#include <string.h>
#endif

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif

#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

#include "definitions.h"

/* a vector of length W*H called 'unaligned_image' contains the data. 
This is written to a vector 'byte_aligned_image', which in general is longer
and is of length 'vector_aligned. This routine returns the lenght of the image, 
once it have been byte-aligned 

The image 'unaligned_image' is expected to have the top of the image at the top of the
file. This routine puts the image, so the bottom of the image is at the beggining of the 
vector 'byte_aligned_image' 
*/

int align_bitmap_image(int W,int H,unsigned char *unaligned_image,unsigned char *byte_aligned_image)
{
   int i, j, vector_aligned=0, vector_original=0;
   /* put into the vector, in reverse order - i.e. from bottom to top */
   for(j=0;j<H;j++)
   {
      for(i=0;i <W; ++i)
      {
	 /* vector_aligned is the offset into the image that's padded
	 to allow 4-byte alignment */
	 /* offset is not, and so will allways be <=vector_offset */
	 if( (i==0) && (vector_aligned%4!=0) )
	    vector_aligned++;
	 if( (i==0) && (vector_aligned%4!=0) )
	    vector_aligned++;
	 if( (i==0) && (vector_aligned%4!=0) )
	    vector_aligned++; 
	 byte_aligned_image[vector_aligned]=unaligned_image[vector_original];
	 byte_aligned_image[vector_aligned+1]=unaligned_image[vector_original+1];
	 byte_aligned_image[vector_aligned+2]=unaligned_image[vector_original+2];
         vector_original+=3;
         vector_aligned+=3;
      }
   }
   if( vector_aligned%4!=0 )
      vector_aligned++;
   if( vector_aligned%4!=0 )
      vector_aligned++;
   if( vector_aligned%4!=0 )
      vector_aligned++;
   return(vector_aligned);
}