cvrChannelProcessingInterface.h

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/*
 * Copyright (C) 2007
 * ITCR, Pablo Alvarado
 *
 *
 * This file is part of the Computer Vision and Robotics Library (CVR-Lib)
 *
 * The CVR-Lib is free software; you can redistribute it and/or
 * modify it under the terms of the BSD License.
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the authors nor the names of its contributors may be
 *    used to endorse or promote products derived from this software without
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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/**
 * \file   cvrChannelProcessingInterface.h
 *         Simple interface from which all functors that process a matrix<T>
 *         to produce another matrix can be inherited.
 *
 * \author Pablo Alvarado
 * \date   23.09.2007
 *
 * revisions ..: $Id: cvrChannelProcessingInterface.h,v 1.1 2007/10/14 02:45:37 alvarado Exp $
 */

#ifndef _CVR_CHANNEL_PROCESSING_INTERFACE_H_
#define _CVR_CHANNEL_PROCESSING_INTERFACE_H_

#include "cvrGenericChannel.h"

namespace cvr {

  /**
   * Class channelProcessingInterface
   *
   * Very simple interface to allow virtualization of classes that transform a
   * channel into another one of the same type.
   *
   * Note that it is required that the apply methods do not alter the internal
   * state of the class.
   *
   * \ingroup gInterfaces
   */
  template<typename T>
  class channelProcessingInterface {
  public:

    typedef typename genericChannel<T>::type channel_type;

    /**
     * Virtual destructor
     */
    virtual ~channelProcessingInterface() {};

    /**
     * On-place processing apply.
     *
     * The inherited methods should take the \a srcdest channel, process it in
     * some way, and on the same channel leave the result.  No restrictions are
     * imposed on whether the memory block of the resulting channel will be the
     * same that the one in the original channel.  As a matter of fact, it
     * usually won't be.
     *
     * If you need to ensure the memory constancy, and assuming the resulting
     * channel will always have the same size than the original one, then you
     * can use the following code:
     * \code
     * channelProcessingInterfaceInheritedClass<T> theFunctor;
     * channel<T> tmp;
     * theFunctor.apply(srcdest,tmp);
     * srcdest.fill(tmp)
     * \endcode
     *
     * which of course will be slower as it requires to copy all the data of
     * the result in the original channel.
     *
     * @param srcdest channel with the source data. The result
     *                will be left here too.
     * @return true if apply successful or false otherwise.
     */
    virtual bool apply(channel_type& srcdest) const = 0;

    /**
     * On-copy processing apply.
     *
     * The inherited methods take the \a src channel and process it leaving the
     * result in the \a dest channel.
     *
     * @param src channel with the source data.
     * @param dest channel where the result will be left.
     * @return true if apply successful or false otherwise.
     */
    virtual bool apply(const channel_type& src, channel_type& dest) const = 0;
  };
}

#endif