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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#ifndef _BGFX_PIXEL_BPIXEL_HXX
#define _BGFX_PIXEL_BPIXEL_HXX
#include <sal/types.h>
#include <basegfx/numeric/ftools.hxx>
#include <basegfx/color/bcolor.hxx>
#include <basegfx/basegfxdllapi.h>
//////////////////////////////////////////////////////////////////////////////
// predeclarations
//////////////////////////////////////////////////////////////////////////////
namespace basegfx
{
class BASEGFX_DLLPUBLIC BPixel
{
protected:
union
{
struct
{
// bitfield
unsigned mnR : 8; // red intensity
unsigned mnG : 8; // green intensity
unsigned mnB : 8; // blue intensity
unsigned mnO : 8; // opacity, 0 == full transparence
} maRGBO;
struct
{
// bitfield
unsigned mnValue : 32; // all values
} maCombinedRGBO;
} maPixelUnion;
public:
BPixel()
{
maPixelUnion.maCombinedRGBO.mnValue = 0L;
}
// use explicit here to make sure everyone knows what he is doing. Values range from
// 0..255 integer here.
explicit BPixel(sal_uInt8 nRed, sal_uInt8 nGreen, sal_uInt8 nBlue, sal_uInt8 nOpacity)
{
maPixelUnion.maRGBO.mnR = nRed;
maPixelUnion.maRGBO.mnG = nGreen;
maPixelUnion.maRGBO.mnB = nBlue;
maPixelUnion.maRGBO.mnO = nOpacity;
}
// constructor from BColor which uses double precision color, so change it
// to local integer format. It will also be clamped here.
BPixel(const BColor& rColor, sal_uInt8 nOpacity)
{
maPixelUnion.maRGBO.mnR = sal_uInt8((rColor.getRed() * 255.0) + 0.5);
maPixelUnion.maRGBO.mnG = sal_uInt8((rColor.getGreen() * 255.0) + 0.5);
maPixelUnion.maRGBO.mnB = sal_uInt8((rColor.getBlue() * 255.0) + 0.5);
maPixelUnion.maRGBO.mnO = nOpacity;
}
// copy constructor
BPixel(const BPixel& rPixel)
{
maPixelUnion.maCombinedRGBO.mnValue = rPixel.maPixelUnion.maCombinedRGBO.mnValue;
}
~BPixel()
{}
// assignment operator
BPixel& operator=( const BPixel& rPixel )
{
maPixelUnion.maCombinedRGBO.mnValue = rPixel.maPixelUnion.maCombinedRGBO.mnValue;
return *this;
}
// data access read
sal_uInt8 getRed() const { return maPixelUnion.maRGBO.mnR; }
sal_uInt8 getGreen() const { return maPixelUnion.maRGBO.mnG; }
sal_uInt8 getBlue() const { return maPixelUnion.maRGBO.mnB; }
sal_uInt8 getOpacity() const { return maPixelUnion.maRGBO.mnO; }
sal_uInt32 getRedGreenBlueOpacity() const { return maPixelUnion.maCombinedRGBO.mnValue; }
// data access write
void setRed(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnR = nNew; }
void setGreen(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnG = nNew; }
void setBlue(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnB = nNew; }
void setOpacity(sal_uInt8 nNew) { maPixelUnion.maRGBO.mnO = nNew; }
void setRedGreenBlueOpacity(sal_uInt32 nRedGreenBlueOpacity) { maPixelUnion.maCombinedRGBO.mnValue = nRedGreenBlueOpacity; }
void setRedGreenBlue(sal_uInt8 nR, sal_uInt8 nG, sal_uInt8 nB) { maPixelUnion.maRGBO.mnR = nR; maPixelUnion.maRGBO.mnG = nG; maPixelUnion.maRGBO.mnB = nB; }
// comparators
bool isInvisible() const { return (0 == maPixelUnion.maRGBO.mnO); }
bool isVisible() const { return (0 != maPixelUnion.maRGBO.mnO); }
bool isEmpty() const { return isInvisible(); }
bool isUsed() const { return isVisible(); }
bool operator==( const BPixel& rPixel ) const
{
return (rPixel.maPixelUnion.maCombinedRGBO.mnValue == maPixelUnion.maCombinedRGBO.mnValue);
}
bool operator!=( const BPixel& rPixel ) const
{
return (rPixel.maPixelUnion.maCombinedRGBO.mnValue != maPixelUnion.maCombinedRGBO.mnValue);
}
// empty element
static const BPixel& getEmptyBPixel();
};
//////////////////////////////////////////////////////////////////////////
// external operators
inline BPixel minimum(const BPixel& rTupA, const BPixel& rTupB)
{
BPixel aMin(
(rTupB.getRed() < rTupA.getRed()) ? rTupB.getRed() : rTupA.getRed(),
(rTupB.getGreen() < rTupA.getGreen()) ? rTupB.getGreen() : rTupA.getGreen(),
(rTupB.getBlue() < rTupA.getBlue()) ? rTupB.getBlue() : rTupA.getBlue(),
(rTupB.getOpacity() < rTupA.getOpacity()) ? rTupB.getOpacity() : rTupA.getOpacity());
return aMin;
}
inline BPixel maximum(const BPixel& rTupA, const BPixel& rTupB)
{
BPixel aMax(
(rTupB.getRed() > rTupA.getRed()) ? rTupB.getRed() : rTupA.getRed(),
(rTupB.getGreen() > rTupA.getGreen()) ? rTupB.getGreen() : rTupA.getGreen(),
(rTupB.getBlue() > rTupA.getBlue()) ? rTupB.getBlue() : rTupA.getBlue(),
(rTupB.getOpacity() > rTupA.getOpacity()) ? rTupB.getOpacity() : rTupA.getOpacity());
return aMax;
}
inline BPixel interpolate(const BPixel& rOld1, const BPixel& rOld2, double t)
{
if(rOld1 == rOld2)
{
return rOld1;
}
else if(0.0 >= t)
{
return rOld1;
}
else if(1.0 <= t)
{
return rOld2;
}
else
{
const sal_uInt32 nFactor(fround(256.0 * t));
const sal_uInt32 nNegFac(256L - nFactor);
return BPixel(
(sal_uInt8)(((sal_uInt32)rOld1.getRed() * nNegFac + (sal_uInt32)rOld2.getRed() * nFactor) >> 8L),
(sal_uInt8)(((sal_uInt32)rOld1.getGreen() * nNegFac + (sal_uInt32)rOld2.getGreen() * nFactor) >> 8L),
(sal_uInt8)(((sal_uInt32)rOld1.getBlue() * nNegFac + (sal_uInt32)rOld2.getBlue() * nFactor) >> 8L),
(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() * nNegFac + (sal_uInt32)rOld2.getOpacity() * nFactor) >> 8L));
}
}
inline BPixel average(const BPixel& rOld1, const BPixel& rOld2)
{
if(rOld1 == rOld2)
{
return rOld1;
}
else
{
return BPixel(
(sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed()) >> 1L),
(sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen()) >> 1L),
(sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue()) >> 1L),
(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity()) >> 1L));
}
}
inline BPixel average(const BPixel& rOld1, const BPixel& rOld2, const BPixel& rOld3)
{
if(rOld1 == rOld2 && rOld2 == rOld3)
{
return rOld1;
}
else
{
return BPixel(
(sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed() + (sal_uInt32)rOld3.getRed()) / 3L),
(sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen() + (sal_uInt32)rOld3.getGreen()) / 3L),
(sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue() + (sal_uInt32)rOld3.getBlue()) / 3L),
(sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity() + (sal_uInt32)rOld3.getOpacity()) / 3L));
}
}
} // end of namespace basegfx
#endif /* _BGFX_PIXEL_BPIXEL_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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