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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: colormisc.hxx,v $
*
* $Revision: 1.5 $
*
* last change: $Author: thb $ $Date: 2006-07-21 20:57:05 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
#ifndef INCLUDED_BASEBMP_COLORMISC_HXX
#define INCLUDED_BASEBMP_COLORMISC_HXX
#include <osl/diagnose.h>
#include <basebmp/color.hxx>
#include <basebmp/colortraits.hxx>
#include <basebmp/accessortraits.hxx>
#include <vigra/mathutil.hxx>
// Contents of this header moved out of color.hxx, as it is not useful
// for the general public (drags in vigra and other template
// functionality, that shouldn't be necessary for the ordinary client
// of BitmapDevice etc.)
namespace basebmp
{
template< bool polarity > struct ColorBitmaskOutputMaskFunctor;
template<> struct ColorBitmaskOutputMaskFunctor<true> : MaskFunctorBase<Color,sal_uInt8>
{
Color operator()( Color v1, sal_uInt8 m, Color v2 ) const
{
OSL_ASSERT(m<=1);
return Color(v1.toInt32()*(sal_uInt8)(1-m) + v2.toInt32()*m);
}
};
template<> struct ColorBitmaskOutputMaskFunctor<false> : MaskFunctorBase<Color,sal_uInt8>
{
Color operator()( Color v1, sal_uInt8 m, Color v2 ) const
{
OSL_ASSERT(m<=1);
return Color(v1.toInt32()*m + v2.toInt32()*(sal_uInt8)(1-m));
}
};
/// Specialized output mask functor for Color value type
template<bool polarity> struct outputMaskFunctorSelector< Color, sal_uInt8, polarity, FastMask >
{
typedef ColorBitmaskOutputMaskFunctor<polarity> type;
};
template< bool polarity > struct ColorBlendFunctor
: public TernaryFunctorBase<sal_uInt8,Color,Color,Color>
{
Color operator()( sal_uInt8 alpha,
Color v1,
Color v2 ) const
{
alpha = polarity ? alpha : 255 - alpha;
const sal_uInt8 v1_red( v1.getRed() );
const sal_uInt8 v1_green( v1.getGreen() );
const sal_uInt8 v1_blue( v1.getBlue() );
// using '>> 8' instead of '/ 0x100' is ill-advised (shifted
// value might be negative). Better rely on decent optimizer
// here...
return Color(((((sal_Int32)v2.getRed() - v1_red)*alpha) / 0x100) + v1_red,
((((sal_Int32)v2.getGreen() - v1_green)*alpha) / 0x100) + v1_green,
((((sal_Int32)v2.getBlue() - v1_blue)*alpha) / 0x100) + v1_blue);
}
};
//-----------------------------------------------------------------------------
template<> struct ColorTraits< Color >
{
/// @return number of color channels
static int numChannels() { return 3; }
/// Type of a color component (i.e. the type of an individual channel)
typedef sal_uInt8 component_type;
/// Metafunction to select blend functor from color and alpha type
template< typename AlphaType, bool polarity > struct blend_functor;
/// Calculate normalized distance between color c1 and c2
static inline double distance( const Color& c1,
const Color& c2 )
{
return (c1 - c2).magnitude();
}
static inline component_type toGreyscale( const Color& c )
{
return c.getGreyscale();
}
static inline Color fromGreyscale( component_type c )
{
return Color(c,c,c);
}
};
/// Only defined for 8 bit alpha, currently
template<bool polarity> struct ColorTraits< Color >::blend_functor< sal_uInt8, polarity >
{
typedef ColorBlendFunctor<polarity> type;
};
} // namespace basebmp
namespace vigra
{
template<>
struct NumericTraits<basebmp::Color>
{
typedef basebmp::Color Type;
typedef basebmp::Color Promote;
typedef basebmp::Color RealPromote;
typedef std::complex<basebmp::Color> ComplexPromote;
typedef sal_uInt8 ValueType;
typedef VigraTrueType isIntegral;
typedef VigraFalseType isScalar;
typedef VigraTrueType isSigned;
typedef VigraTrueType isOrdered;
typedef VigraFalseType isComplex;
static Type zero() { return Type(); }
static Type one() { return Type(0x01010101); }
static Type nonZero() { return Type(0x01010101); }
static Promote toPromote(const Type& v) { return v; }
static RealPromote toRealPromote(const Type& v) { return v; }
static Type fromPromote(const Promote& v) { return v; }
static Type fromRealPromote(const RealPromote& v) { return v; }
};
} // namespace vigra
#endif /* INCLUDED_BASEBMP_COLORMISC_HXX */
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