PixelRef.h

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/********************************************************************
**                Image Component Library (ICL)                    **
**                                                                 **
** Copyright (C) 2006-2013 CITEC, University of Bielefeld          **
**                         Neuroinformatics Group                  **
** Website: www.iclcv.org and                                      **
**          http://opensource.cit-ec.de/projects/icl               **
**                                                                 **
** File   : ICLCore/src/ICLCore/PixelRef.h                         **
** Module : ICLCore                                                **
** Authors: Christof Elbrechter                                    **
**                                                                 **
**                                                                 **
** GNU LESSER GENERAL PUBLIC LICENSE                               **
** This file may be used under the terms of the GNU Lesser General **
** Public License version 3.0 as published by the                  **
**                                                                 **
** Free Software Foundation and appearing in the file LICENSE.LGPL **
** included in the packaging of this file.  Please review the      **
** following information to ensure the license requirements will   **
** be met: http://www.gnu.org/licenses/lgpl-3.0.txt                **
**                                                                 **
** The development of this software was supported by the           **
** Excellence Cluster EXC 277 Cognitive Interaction Technology.    **
** The Excellence Cluster EXC 277 is a grant of the Deutsche       **
** Forschungsgemeinschaft (DFG) in the context of the German       **
** Excellence Initiative.                                          **
**                                                                 **
********************************************************************/

#pragma once

#include <ICLUtils/CompatMacros.h>
#include <ICLCore/Types.h>
#include <ICLUtils/SmartArray.h>
#include <ICLUtils/Exception.h>
#include <ICLUtils/Macros.h>
#include <ICLMath/FixedMatrix.h>
#include <ICLUtils/ClippedCast.h>

namespace icl{
  namespace core{

    template<class T>
    class PixelRef{

      std::vector<T*> m_data;

      public:

      inline PixelRef(){}

      inline bool isNull() const { return !m_data->size(); }


      inline PixelRef(int x, int y, int width, std::vector<utils::SmartArray<T> > &data):
      m_data(data.size()){
        int offs = x+width*y;
        for(unsigned int i=0;i<data.size();++i){
          this->m_data[i] = data[i].get()+offs;
        }
      }

      inline PixelRef(const PixelRef &other):m_data(other.m_data){}


      inline PixelRef &operator=(const PixelRef &other){
        ICLASSERT_THROW(other.m_data.size() == m_data.size(),utils::ICLException("incompatible channel count"));
        for(unsigned int i=0;i<m_data.size();++i){
          *m_data[i] = *other.m_data[i];
        }
        return *this;
      }

      inline PixelRef &operator=(const std::vector<T> &vec){
        ICLASSERT_THROW(vec.size() == m_data.size(),utils::ICLException("incompatible channel count"));
        for(unsigned int i=0;i<m_data.size();++i){
          *m_data[i] = vec[i];
        }
        return *this;
      }


      template<class MT,unsigned int COLS,unsigned int ROWS>
      inline PixelRef &operator=(const math::FixedMatrix<MT,COLS,ROWS> &mat){
        ICLASSERT_THROW((m_data.size() == math::FixedMatrix<MT,COLS,ROWS>::DIM), utils::ICLException("channel count and matrix dim are incompatible"));
        for(unsigned int i=0;i<m_data.size();++i){
          *m_data[i] = utils::clipped_cast<MT,T>(mat[i]);
        }
        return *this;
      }

      inline std::vector<T> asVec() const{
        std::vector<T> v(m_data.size());
        for(unsigned int i=0;i<m_data.size();++i){
          v[i] = *m_data[i];
        }
        return v;
      }

      inline void set(const T &v0) { *m_data[0] = v0; }

      inline void set(const T &v0, const T&v1) { set(v0); *m_data[1] = v1; }

      inline void set(const T &v0, const T&v1, const T&v2) { set(v0,v1); *m_data[2] = v2; }

      inline void set(const T &v0, const T&v1, const T&v2, const T &v3) { set(v0,v1,v2); *m_data[3] = v3; }


      template<class ForwardIterator>
      inline void setFromRange(ForwardIterator begin, ForwardIterator end) {
        for(unsigned int i=0;i<m_data.size();++i,++begin){
          if(begin == end) throw utils::ICLException("Range is longer then channel count");
          *m_data[i] = *begin;
        }
      }

      T &operator[](unsigned int channel) {
        ICLASSERT_THROW(channel < m_data.size(),utils::ICLException("invalid channel index"));
        return *m_data[channel];
      }

      const T &operator[](unsigned int channel) const {
        ICLASSERT_THROW(channel < m_data.size(),utils::ICLException("invalid channel index"));
        return *m_data[channel];
      }

      int getChannels() const {
        return (int)m_data.size();
      }
    };
  } // namespace core
}