#ifndef FLIP_HEADER
#define FLIP_HEADER 1
/////////////////////////////////////////////////////
//! docentry="Image.Image Processing.Operators"
//! file="amma/Image/IPStream/IPBasic/Flip.hh"
//! lib=IP
//! userlevel=Normal
//! rcsid="$Id: Flip.hh,v 1.6 2001/02/15 16:43:19 eep1rs Exp $"
//! author="Alistair Fitch"
//! date="21/03/2000"

#include "amma/Image.hh"
#include "amma/ImagIter.hh"

//: Standard image processing operations.

namespace StdImageN
{

  template<class PixelT> ImageC<PixelT> Flip(const ImageC<PixelT> &im)
  {
    ImageC<PixelT> flipped(im.Rectangle());
    ImageIterC<PixelT> it(im);
    IndexT frow = flipped.BRow();
    PixelT *place = &(flipped[frow][flipped.RCol()]);
    while(it.IsElm()) {
      *place = it.Data();
      if(it.RNext()) {
        place--;
        continue;
      }
      // Next row ?
      if(!it.IsElm())
        break;
      frow--;
      place = &(flipped[frow][flipped.RCol()]);
    }
    return flipped;
  }
  //: Flip image back to front and upside down.
  // Make a new which is flipped both vertically and horizontally.
  
  template<class PixelT> ImageC<PixelT> FlipH(const ImageC<PixelT> &im)
  {
    ImageC<PixelT> flipped(im.Rectangle());
    ImageIterC<PixelT> it(im);
    IndexT frow = flipped.TRow();
    PixelT *place = &(flipped[frow][flipped.RCol()]);
    while(it.IsElm()) {
      *place = it.Data();
      if(it.RNext()) {
        place--;
        continue;
      }
      // Next row ?
      if(!it.IsElm())
        break;
      frow++;
      place = &(flipped[frow][flipped.RCol()]);
    }
    return flipped;
  }
  //: Flip image horizontaly.

  template<class PixelT> ImageC<PixelT> FlipV(const ImageC<PixelT> &im)
  {
    ImageC<PixelT> flipped(im.Rectangle());
    ImageIterC<PixelT> it(im);
    IndexT frow = flipped.BRow();
    PixelT *place = &(flipped[frow][flipped.LCol()]);
    while(it.IsElm()) {
      *place = it.Data();
      if(it.RNext()) {
        place++;
        continue;
      }
      // Next row ?
      if(!it.IsElm())
        break;
      frow--;
      place = &(flipped[frow][flipped.LCol()]);
    }
    return flipped;
  }
  //: Flip image vertically.
  
};

#endif