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/* $Id$
-----------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------
*/
/** \file ImageMix.h
* \ingroup bgevideotex
*/
#if !defined IMAGEMIX_H
#define IMAGEMIX_H
#include "Common.h"
#include "ImageBase.h"
#include "FilterBase.h"
/// class for source mixing
class ImageSourceMix : public ImageSource
{
public:
/// constructor
ImageSourceMix (const char * id) : ImageSource(id), m_weight(0x100) {}
/// destructor
virtual ~ImageSourceMix (void) {}
/// get offset
long long getOffset (void) { return m_offset; }
/// set offset
void setOffset (unsigned int * firstImg) { m_offset = m_image - firstImg; }
/// get weight
short getWeight (void) { return m_weight; }
/// set weight
void setWeight (short weight) { m_weight = weight; }
protected:
/// buffer offset to the first source buffer
long long m_offset;
/// source weight
short m_weight;
};
/// class for image mixer
class ImageMix : public ImageBase
{
public:
/// constructor
ImageMix (void) : ImageBase(false) {}
/// destructor
virtual ~ImageMix (void) {}
/// get weight
short getWeight (const char * id);
/// set weight
bool setWeight (const char * id, short weight);
protected:
/// create new source
virtual ImageSource * newSource (const char * id) { return new ImageSourceMix(id); }
/// calculate image from sources and set its availability
virtual void calcImage (unsigned int texId, double ts);
};
/// pixel filter for image mixer
class FilterImageMix : public FilterBase
{
public:
/// constructor
FilterImageMix (ImageSourceList & sources) : m_sources(sources) {}
/// destructor
virtual ~FilterImageMix (void) {}
protected:
/// source list
ImageSourceList & m_sources;
/// filter pixel, source int buffer
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
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