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Diffstat (limited to 'include/vcl/ColorMask.hxx')
| -rw-r--r-- | include/vcl/ColorMask.hxx | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/include/vcl/ColorMask.hxx b/include/vcl/ColorMask.hxx new file mode 100644 index 000000000..7610aa87e --- /dev/null +++ b/include/vcl/ColorMask.hxx @@ -0,0 +1,193 @@ +/* -*- 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: */ |