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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_VCL_COLORMASK_HXX
#define INCLUDED_VCL_COLORMASK_HXX
#include <vcl/dllapi.h>
#include <vcl/BitmapColor.hxx>
#define MASK_TO_COLOR( d_nVal, d_RM, d_GM, d_BM, d_RS, d_GS, d_BS, d_Col ) \
const sal_uInt8 _def_cR = static_cast<sal_uInt8>( d_RS < 0 ? ( (d_nVal) & d_RM ) << -d_RS : ( (d_nVal) & d_RM ) >> d_RS ); \
const sal_uInt8 _def_cG = static_cast<sal_uInt8>( d_GS < 0 ? ( (d_nVal) & d_GM ) << -d_GS : ( (d_nVal) & d_GM ) >> d_GS ); \
const sal_uInt8 _def_cB = static_cast<sal_uInt8>( d_BS < 0 ? ( (d_nVal) & d_BM ) << -d_BS : ( (d_nVal) & d_BM ) >> d_BS ); \
d_Col = BitmapColor( static_cast<sal_uInt8>( _def_cR | ( ( _def_cR & maR.mnOr ) >> maR.mnOrShift ) ), \
static_cast<sal_uInt8>( _def_cG | ( ( _def_cG & maG.mnOr ) >> maG.mnOrShift ) ), \
static_cast<sal_uInt8>( _def_cB | ( ( _def_cB & maB.mnOr ) >> maB.mnOrShift ) ) );
#define COLOR_TO_MASK( d_rCol, d_RM, d_GM, d_BM, d_RS, d_GS, d_BS, d_ALPHA ) \
( ( ( ( d_RS < 0 ) ? ( static_cast<sal_uInt32>((d_rCol).GetRed()) >> -d_RS ) : \
( static_cast<sal_uInt32>((d_rCol).GetRed()) << d_RS ) ) & d_RM ) | \
( ( ( d_GS < 0 ) ? ( static_cast<sal_uInt32>((d_rCol).GetGreen()) >> -d_GS ) : \
( static_cast<sal_uInt32>((d_rCol).GetGreen()) << d_GS ) ) & d_GM ) | \
( ( ( d_BS < 0 ) ? ( static_cast<sal_uInt32>((d_rCol).GetBlue()) >> -d_BS ) : \
( static_cast<sal_uInt32>((d_rCol).GetBlue()) << d_BS ) ) & d_BM ) | \
d_ALPHA )
struct VCL_DLLPUBLIC ColorMaskElement
{
sal_uInt32 mnMask;
int mnShift;
int mnOrShift;
sal_uInt8 mnOr;
explicit ColorMaskElement(sal_uInt32 nMask = 0)
: mnMask(nMask)
, mnShift(0)
, mnOrShift(0)
, mnOr(0)
{
}
bool CalcMaskShift()
{
if (mnMask == 0)
return true;
// from which bit starts the mask?
int nShift = 31;
while( nShift >= 0 && !( mnMask & ( 1 << nShift ) ) )
--nShift;
mnShift = nShift - 7;
int nLen = 0;
// XXX determine number of bits set => walk right until null
while( nShift >= 0 && ( mnMask & ( 1 << nShift ) ) )
{
nShift--;
nLen++;
}
if (nLen > 8) // mask length must be 8 bits or less
return false;
mnOrShift = 8 - nLen;
mnOr = static_cast<sal_uInt8>( ( 0xFF >> nLen ) << mnOrShift );
return true;
}
};
class VCL_DLLPUBLIC ColorMask
{
ColorMaskElement maR;
ColorMaskElement maG;
ColorMaskElement maB;
public:
ColorMask(const ColorMaskElement& rRedMask = ColorMaskElement(),
const ColorMaskElement& rGreenMask = ColorMaskElement(),
const ColorMaskElement& rBlueMask = ColorMaskElement())
: maR(rRedMask)
, maG(rGreenMask)
, maB(rBlueMask)
{
}
inline sal_uInt32 GetRedMask() const;
inline sal_uInt32 GetGreenMask() const;
inline sal_uInt32 GetBlueMask() const;
inline void GetColorFor16BitMSB( BitmapColor& rColor, const sal_uInt8* pPixel ) const;
inline void SetColorFor16BitMSB( const BitmapColor& rColor, sal_uInt8* pPixel ) const;
inline void GetColorFor16BitLSB( BitmapColor& rColor, const sal_uInt8* pPixel ) const;
inline void SetColorFor16BitLSB( const BitmapColor& rColor, sal_uInt8* pPixel ) const;
inline void GetColorFor32Bit( BitmapColor& rColor, const sal_uInt8* pPixel ) const;
inline void GetColorAndAlphaFor32Bit( BitmapColor& rColor, sal_uInt8& rAlpha, const sal_uInt8* pPixel ) const;
inline void SetColorFor32Bit( const BitmapColor& rColor, sal_uInt8* pPixel ) const;
};
inline sal_uInt32 ColorMask::GetRedMask() const
{
return maR.mnMask;
}
inline sal_uInt32 ColorMask::GetGreenMask() const
{
return maG.mnMask;
}
inline sal_uInt32 ColorMask::GetBlueMask() const
{
return maB.mnMask;
}
inline void ColorMask::GetColorFor16BitMSB( BitmapColor& rColor, const sal_uInt8* pPixel ) const
{
const sal_uInt32 nVal = pPixel[ 1 ] | ( static_cast<sal_uInt32>(pPixel[ 0 ]) << 8 );
MASK_TO_COLOR( nVal, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, rColor );
}
inline void ColorMask::SetColorFor16BitMSB( const BitmapColor& rColor, sal_uInt8* pPixel ) const
{
const sal_uInt16 nVal = static_cast<sal_uInt16>(COLOR_TO_MASK( rColor, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, 0/*nAlphaChannel*/ ));
pPixel[ 0 ] = static_cast<sal_uInt8>(nVal >> 8);
pPixel[ 1 ] = static_cast<sal_uInt8>(nVal);
}
inline void ColorMask::GetColorFor16BitLSB( BitmapColor& rColor, const sal_uInt8* pPixel ) const
{
const sal_uInt32 nVal = pPixel[ 0 ] | ( static_cast<sal_uInt32>(pPixel[ 1 ]) << 8 );
MASK_TO_COLOR( nVal, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, rColor );
}
inline void ColorMask::SetColorFor16BitLSB( const BitmapColor& rColor, sal_uInt8* pPixel ) const
{
const sal_uInt16 nVal = static_cast<sal_uInt16>(COLOR_TO_MASK( rColor, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, 0/*nAlphaChannel*/ ));
pPixel[ 0 ] = static_cast<sal_uInt8>(nVal);
pPixel[ 1 ] = static_cast<sal_uInt8>(nVal >> 8);
}
inline void ColorMask::GetColorFor32Bit( BitmapColor& rColor, const sal_uInt8* pPixel ) const
{
const sal_uInt32 nVal = static_cast<sal_uInt32>(pPixel[ 0 ]) | ( static_cast<sal_uInt32>(pPixel[ 1 ]) << 8 ) |
( static_cast<sal_uInt32>(pPixel[ 2 ]) << 16 ) | ( static_cast<sal_uInt32>(pPixel[ 3 ]) << 24 );
MASK_TO_COLOR( nVal, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, rColor );
}
inline void ColorMask::GetColorAndAlphaFor32Bit( BitmapColor& rColor, sal_uInt8& rAlpha, const sal_uInt8* pPixel ) const
{
const sal_uInt32 nVal = static_cast<sal_uInt32>(pPixel[ 0 ]) | ( static_cast<sal_uInt32>(pPixel[ 1 ]) << 8 ) |
( static_cast<sal_uInt32>(pPixel[ 2 ]) << 16 ) | ( static_cast<sal_uInt32>(pPixel[ 3 ]) << 24 );
rAlpha = static_cast<sal_uInt8>(nVal >> 24);
MASK_TO_COLOR( nVal, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, rColor );
}
inline void ColorMask::SetColorFor32Bit( const BitmapColor& rColor, sal_uInt8* pPixel ) const
{
const sal_uInt32 nVal = COLOR_TO_MASK( rColor, maR.mnMask, maG.mnMask, maB.mnMask, maR.mnShift, maG.mnShift, maB.mnShift, 0/*nAlphaChannel*/ );
pPixel[ 0 ] = static_cast<sal_uInt8>(nVal);
pPixel[ 1 ] = static_cast<sal_uInt8>( nVal >> 8 );
pPixel[ 2 ] = static_cast<sal_uInt8>( nVal >> 16 );
pPixel[ 3 ] = static_cast<sal_uInt8>( nVal >> 24 );
}
#endif // INCLUDED_VCL_COLORMASK_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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