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/*
-----------------------------------------------------------------------------
This source file is part of blendTex 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 FilterBlueScreen.h
* \ingroup bgevideotex
*/
#if !defined FILTERBLUESCREEN_H
#define FILTERBLUESCREEN_H
#include "Common.h"
#include "FilterBase.h"
/// pixel filter for blue screen
class FilterBlueScreen : public FilterBase
{
public:
/// constructor
FilterBlueScreen (void);
/// destructor
virtual ~FilterBlueScreen (void) {}
/// get color
unsigned char * getColor (void) { return m_color; }
/// set color
void setColor (unsigned char red, unsigned char green, unsigned char blue);
/// get limits for color variation
unsigned short * getLimits (void) { return m_limits; }
/// set limits for color variation
void setLimits (unsigned short minLimit, unsigned short maxLimit);
protected:
/// blue screen color (red component first)
unsigned char m_color[3];
/// limits for color variation - first defines, where ends fully transparent
/// color, second defines, where begins fully opaque color
unsigned short m_limits[2];
/// squared limits for color variation
unsigned int m_squareLimits[2];
/// distance between squared limits
unsigned int m_limitDist;
/// filter pixel template, source int buffer
template <class SRC> unsigned int tFilter (SRC src, short x, short y,
short * size, unsigned int pixSize, unsigned int val)
{
// calculate differences
int difRed = int(VT_R(val)) - int(m_color[0]);
int difGreen = int(VT_G(val)) - int(m_color[1]);
int difBlue = int(VT_B(val)) - int(m_color[2]);
// calc distance from "blue screen" color
unsigned int dist = (unsigned int)(difRed * difRed + difGreen * difGreen
+ difBlue * difBlue);
// condition for fully transparent color
if (m_squareLimits[0] >= dist)
// return color with zero alpha
VT_A(val) = 0;
// condition for fully opaque color
else if (m_squareLimits[1] <= dist)
// return normal color
VT_A(val) = 0xFF;
// otherwise calc alpha
else
VT_A(val) = (((dist - m_squareLimits[0]) << 8) / m_limitDist);
return val;
}
/// virtual filtering function for byte source
virtual unsigned int filter (unsigned char * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return tFilter(src, x, y, size, pixSize, val); }
/// virtual filtering function for unsigned int source
virtual unsigned int filter (unsigned int * src, short x, short y,
short * size, unsigned int pixSize, unsigned int val = 0)
{ return tFilter(src, x, y, size, pixSize, val); }
};
#endif
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