ImageMix.h

Go to the documentation of this file.

/*
-----------------------------------------------------------------------------
This source file is part of VideoTexture library

Copyright (c) 2007 The Zdeno Ash Miklas

This program is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.

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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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, or go to
http://www.gnu.org/copyleft/lesser.txt.
-----------------------------------------------------------------------------
*/

#if !defined IMAGEMIX_H
#define IMAGEMIX_H


#include "Common.h"

#include "ImageBase.h"
#include "FilterBase.h"


class ImageSourceMix : public ImageSource
{
public:
    ImageSourceMix (const char * id) : ImageSource(id), m_weight(0x100) {}
    virtual ~ImageSourceMix (void) {}

    long long getOffset (void) { return m_offset; }
    void setOffset (unsigned int * firstImg) { m_offset = m_image - firstImg; }

    short getWeight (void) { return m_weight; }
    void setWeight (short weight) { m_weight = weight; }

protected:
    long long m_offset;
    short m_weight;
};


class ImageMix : public ImageBase
{
public:
    ImageMix (void) : ImageBase(false) {}

    virtual ~ImageMix (void) {}

    short getWeight (const char * id);
    bool setWeight (const char * id, short weight);

protected:

    virtual ImageSource * newSource (const char * id) { return new ImageSourceMix(id); }

    virtual void calcImage (unsigned int texId, double ts);
};


class FilterImageMix : public FilterBase
{
public:
    FilterImageMix (ImageSourceList & sources) : m_sources(sources) {}
    virtual ~FilterImageMix (void) {}

protected:
    ImageSourceList & m_sources;

    virtual unsigned int filter (unsigned int * src, short x, short y,
        short * size, unsigned int pixSize, unsigned int val = 0)
    {
        // resulting pixel color
        int color[] = {0, 0, 0, 0};
        // iterate sources
        for (ImageSourceList::iterator it = m_sources.begin(); it != m_sources.end(); ++it)
        {
            // get pointer to mixer source
            ImageSourceMix * mixSrc = static_cast<ImageSourceMix*>(*it);
            // add weighted source pixel to result
            color[0] += mixSrc->getWeight() * (src[mixSrc->getOffset()] & 0xFF);
            color[1] += mixSrc->getWeight() * ((src[mixSrc->getOffset()] >> 8) & 0xFF);
            color[2] += mixSrc->getWeight() * ((src[mixSrc->getOffset()] >> 16) & 0xFF);
            color[3] += mixSrc->getWeight() * ((src[mixSrc->getOffset()] >> 24) & 0xFF);
        }
        // return resulting color
        return ((color[0] >> 8) & 0xFF) | (color[1] & 0xFF00)
            | ((color[2] << 8) & 0xFF0000) | ((color[3] << 16) & 0xFF000000);
    }
};


#endif