vs.cc

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/*--------------------------------------------------------------------
 *
 * (C) Copyright Koninklijke Philips Electronics NV 2006. 
 * All rights reserved. This software is licensed under the terms of
 * version 2.1 of the GNU Lesser General Public License as published 
 * by the Free Software Foundation. For licensing and warranty
 * information, see the file COPYING in the main directory.
 *
 *------------------------------------------------------------------*/

#include "vs.h"

using namespace std;

VS::VS(
  const Id&           n, 
  In<VYApixel>&       Cin,
  In<VYAimageWidth>&  imageWidthIn,
  In<VYAimageHeight>& imageHeightIn,
  In<VYAimageHeight>& outImageHeightIn,
  Out<VYApixel>&      Cout)
:
  Process(n),
  CinP(             id("CinP"),             Cin),
  imageWidthInP(    id("imageWidthInP"),    imageWidthIn),
  imageHeightInP(   id("imageHeightInP"),   imageHeightIn),
  outImageHeightInP(id("outImageHeightInP"),outImageHeightIn),
  CoutP(            id("CoutP"),            Cout)
{ 
}

void VS::main()
{
  while (true)
  {
    VYAimageWidth imageWidth;
    VYAimageHeight imageHeight;
    VYAimageHeight outImageHeight;
    double index;
    double scaleFactor;
    
    read(imageWidthInP, imageWidth);
    read(imageHeightInP, imageHeight);
    read(outImageHeightInP, outImageHeight);

    index = 0;
    scaleFactor = (double)outImageHeight / (double)imageHeight;
        
    VYApixel* line = new VYApixel[imageWidth];
    
    if (scaleFactor <= 1) /* compress */
    {
      for (unsigned int i=0; i<imageHeight; i++)
      {
        read(CinP, line, imageWidth);
        if (index <= i)
        {
          write(CoutP, line, imageWidth);
          index += 1/scaleFactor;
        }
      }
    }
    else /* expand */
    {
      for (unsigned int i=0; i<outImageHeight; i++)
      {
        if (index <= i)
        {
          read(CinP, line, imageWidth);
          index += scaleFactor;
        }     
        write(CoutP, line, imageWidth);
      }
    }
    
    delete [] line;
  }
}

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