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filterlevel.cpp

/**********************************************************************************
* Copyright (c) 2003, Christoph Rueegg <opendev@cdrnet.ch> and Matthias Bader     *
* All rights reserved.                                                            *
*                                                                                 *
* Project Website: http://www.cdrnet.net/projects/painter/                        *
*                                                                                 *
* 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.                          *
*                                                                                 *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"     *
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE       *
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE      *
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE        *
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR             *
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF            *
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS        *
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN         *
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)         *
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF          *
* THE POSSIBILITY OF SUCH DAMAGE.                                                 *
**********************************************************************************/

#include "filterlevel.h"

LevelFilter::LevelFilter() : ChannelFilter<unsigned char>()
{
}

LevelFilter::~LevelFilter()
{
}

void LevelFilter::OnMouseEvent(const int button, const int state, int x, int y)
{
  if(button!=0)
  {
    return;
  }
  if(state == 0 && button == 0)
  {
    unsigned char current;
    unsigned char min = 255;
    unsigned char max = 0;
    int x1,y1;
    for(x1=0;x1<GetWidth();x1++)
      for(y1=0;y1<GetHeight();y1++)
      {
        current = ChannelFilter<unsigned char>::Get(x1,y1);
        if(current < min)
          min = current;
        if(current > max)
          max = current;
      }
    for(x1=0;x1<GetWidth();x1++)
      for(y1=0;y1<GetHeight();y1++)
      {
        current = ChannelFilter<unsigned char>::Get(x1,y1);
        ChannelFilter<unsigned char>::Set(x1,y1,(unsigned char)((current-min)*255.0/(max-min)));
      }
  }
}

ChannelFilter<unsigned char>* LevelFilter::EmptyClone()
{
  LevelFilter *copy = new LevelFilter();
  copy->SetSubChannel(GetSubChannel());
  return(copy);
}

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