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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_BASEGFX_PIXEL_BPIXEL_HXX
#define INCLUDED_BASEGFX_PIXEL_BPIXEL_HXX
#include <sal/types.h>
#include <basegfx/numeric/ftools.hxx>
#include <basegfx/color/bcolor.hxx>
#include <basegfx/basegfxdllapi.h>
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; }
// 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; }
// comparators
bool isInvisible() const { return (0 == maPixelUnion.maRGBO.mnO); }
bool isVisible() const { return (0 != maPixelUnion.maRGBO.mnO); }
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);
}
};
// external operators
inline BPixel minimum(const BPixel& rTupA, const BPixel& rTupB)
{
return BPixel(
std::min(rTupB.getRed(), rTupA.getRed()),
std::min(rTupB.getGreen(), rTupA.getGreen()),
std::min(rTupB.getBlue(), rTupA.getBlue()),
std::min(rTupB.getOpacity(), rTupA.getOpacity()));
}
inline BPixel maximum(const BPixel& rTupA, const BPixel& rTupB)
{
return BPixel(
std::max(rTupB.getRed(), rTupA.getRed()),
std::max(rTupB.getGreen(), rTupA.getGreen()),
std::max(rTupB.getBlue(), rTupA.getBlue()),
std::max(rTupB.getOpacity(), rTupA.getOpacity()));
}
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)
{
return BPixel(
rOld1.getRed() == rOld2.getRed() ? rOld1.getRed() : (sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed()) >> 1L),
rOld1.getGreen() == rOld2.getGreen() ? rOld1.getGreen() : (sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen()) >> 1L),
rOld1.getBlue() == rOld2.getBlue() ? rOld1.getBlue() : (sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue()) >> 1L),
rOld1.getOpacity() == rOld2.getOpacity() ? rOld1.getOpacity() : (sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity()) >> 1L));
}
inline BPixel average(const BPixel& rOld1, const BPixel& rOld2, const BPixel& rOld3)
{
return BPixel(
(rOld1.getRed() == rOld2.getRed() && rOld2.getRed() == rOld3.getRed()) ? rOld1.getRed() : (sal_uInt8)(((sal_uInt32)rOld1.getRed() + (sal_uInt32)rOld2.getRed() + (sal_uInt32)rOld3.getRed()) / 3L),
(rOld1.getGreen() == rOld2.getGreen() && rOld2.getGreen() == rOld3.getGreen()) ? rOld1.getGreen() : (sal_uInt8)(((sal_uInt32)rOld1.getGreen() + (sal_uInt32)rOld2.getGreen() + (sal_uInt32)rOld3.getGreen()) / 3L),
(rOld1.getBlue() == rOld2.getBlue() && rOld2.getBlue() == rOld3.getBlue()) ? rOld1.getBlue() : (sal_uInt8)(((sal_uInt32)rOld1.getBlue() + (sal_uInt32)rOld2.getBlue() + (sal_uInt32)rOld3.getBlue()) / 3L),
(rOld1.getOpacity() == rOld2.getOpacity() && rOld2.getOpacity() == rOld3.getOpacity()) ? rOld1.getOpacity() : (sal_uInt8)(((sal_uInt32)rOld1.getOpacity() + (sal_uInt32)rOld2.getOpacity() + (sal_uInt32)rOld3.getOpacity()) / 3L));
}
} // end of namespace basegfx
#endif // INCLUDED_BASEGFX_PIXEL_BPIXEL_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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