X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Falign_bitmap_image.c;fp=src%2Falign_bitmap_image.c;h=85662891abd250ed591eb8526c4d4d56ffc77b4e;hb=ec2d2ab8e90a0c4b86ffc2385655c2fb27fcacd9;hp=0000000000000000000000000000000000000000;hpb=795fb988211df268a8f7724bd2f4493c594abee9;p=debian%2Fatlc

diff --git a/src/align_bitmap_image.c b/src/align_bitmap_image.c
new file mode 100644
index 0000000..8566289
--- /dev/null
+++ b/src/align_bitmap_image.c
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+/* 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 gmail.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);
+}