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alphaimage.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 "alphaimage.h"
#include "grayimage.h"

AlphaImage::AlphaImage(const int height, const int width)
{
  alphadata = new Channel<unsigned char>(height,width);
  alphafilter = alphadata;
  this->width = width;
  this->height = height;
}

AlphaImage::~AlphaImage()
{
  delete alphadata;
}

inline unsigned char AlphaImage::GetAlpha(const int x, const int y)
{
  return(alphafilter->Get(x,y));
}

inline void AlphaImage::SetAlpha(const int x, const int y, const unsigned char val)
{
  alphafilter->Set(x,y,val);
}

void AlphaImage::AttachAlphaFilter(ChannelFilter<unsigned char>* filter)
{
  filter->SetSubChannel(alphafilter);
  alphafilter = filter;
}

void AlphaImage::RemoveAlphaFilters()
{
  alphafilter->ResetChannel();
  alphafilter = alphadata;
}

void AlphaImage::LoadAlphaMap(const char* filename)
{
  AlphaImage *a = GrayImage::CreateFromTiff(filename);
  for(int x=0;x<width && x<a->width;x++)
    for(int y=0;y<height && y<a->height;y++)
      alphafilter->Set(x,y,a->GetLuminance(x,y));
}

int AlphaImage::GetWidth()
{
  return(width);
}

int AlphaImage::GetHeight()
{
  return(height);
}

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