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/*
* algorithm.h (C) 2006-2008, Aurélien Croc (AP²C)
*
* 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; version 2 of the License.
*
* 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.
*
* $Id: algorithm.h 157 2008-02-09 02:01:24Z ap2c $
*
*/
#ifndef _ALGORITHM_H_
#define _ALGORITHM_H_
class Request;
class BandPlane;
/**
* @brief This super class is an interface to implement a compression
* algorithm.
*/
class Algorithm
{
protected:
public:
/**
* Initialize the instance.
*/
Algorithm();
/**
* Destroy the instance.
*/
virtual ~Algorithm();
public:
/**
* Compress data.
* @param request the request instance
* @param data the data to compress
* @param width the width of the data / band / page
* @param height the height of the data / band / page
* @return a pointer to a @ref BandPlane instance or NULL.
*/
virtual BandPlane* compress(const Request& request,
unsigned char *data, unsigned long width,
unsigned long height) = 0;
/**
* Reverse line and column.
* the byte at (x=1, y=0) is placed at (x=0, y=1) etc.
* This is used by algorithm 0x11 (at least).
* @return TRUE if this operation is needed. Otherwise returns FALSE.
*/
virtual bool reverseLineColumn() {return false;}
/**
* Inverse the byte.
* Do a NOT operation on each byte.
* @return TRUE if this operation is needed. Otherwise returns FALSE.
*/
virtual bool inverseByte() {return false;}
/**
* Split into bands
* @return TRUE if each planes has to ben split into bands. Otherwise
* it returns FALSE.
*/
virtual bool splitIntoBands() {return false;}
};
#endif /* _ALGORITHM_H_ */
/* vim: set expandtab tabstop=4 shiftwidth=4 smarttab tw=80 cin enc=utf8: */
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