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Diffstat (limited to 'slideshow/source/engine/color.cxx')
| -rw-r--r-- | slideshow/source/engine/color.cxx | 467 |
1 files changed, 467 insertions, 0 deletions
diff --git a/slideshow/source/engine/color.cxx b/slideshow/source/engine/color.cxx new file mode 100644 index 000000000000..e49f8e7e1b63 --- /dev/null +++ b/slideshow/source/engine/color.cxx @@ -0,0 +1,467 @@ +/************************************************************************* + * + * 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. + * + ************************************************************************/ + +// MARKER(update_precomp.py): autogen include statement, do not remove +#include "precompiled_slideshow.hxx" + +#include <hslcolor.hxx> +#include <rgbcolor.hxx> + +#include <basegfx/numeric/ftools.hxx> + +#include <cmath> // for fmod +#include <algorithm> + + +namespace slideshow +{ + namespace internal + { + namespace + { + // helper functions + // ================ + + double getMagic( double nLuminance, double nSaturation ) + { + if( nLuminance <= 0.5 ) + return nLuminance*(1.0 + nSaturation); + else + return nLuminance + nSaturation - nLuminance*nSaturation; + } + + HSLColor::HSLTriple rgb2hsl( double nRed, double nGreen, double nBlue ) + { + // r,g,b in [0,1], h in [0,360] and s,l in [0,1] + HSLColor::HSLTriple aRes; + + const double nMax( ::std::max(nRed,::std::max(nGreen, nBlue)) ); + const double nMin( ::std::min(nRed,::std::min(nGreen, nBlue)) ); + + const double nDelta( nMax - nMin ); + + aRes.mnLuminance = (nMax + nMin) / 2.0; + + if( ::basegfx::fTools::equalZero( nDelta ) ) + { + aRes.mnSaturation = 0.0; + + // hue undefined (achromatic case) + aRes.mnHue = 0.0; + } + else + { + aRes.mnSaturation = aRes.mnLuminance > 0.5 ? + nDelta/(2.0-nMax-nMin) : + nDelta/(nMax + nMin); + + if( nRed == nMax ) + aRes.mnHue = (nGreen - nBlue)/nDelta; + else if( nGreen == nMax ) + aRes.mnHue = 2.0 + (nBlue - nRed)/nDelta; + else if( nBlue == nMax ) + aRes.mnHue = 4.0 + (nRed - nGreen)/nDelta; + + aRes.mnHue *= 60.0; + + if( aRes.mnHue < 0.0 ) + aRes.mnHue += 360.0; + } + + return aRes; + } + + double hsl2rgbHelper( double nValue1, double nValue2, double nHue ) + { + // clamp hue to [0,360] + nHue = fmod( nHue, 360.0 ); + + // cope with wrap-arounds + if( nHue < 0.0 ) + nHue += 360.0; + + if( nHue < 60.0 ) + return nValue1 + (nValue2 - nValue1)*nHue/60.0; + else if( nHue < 180.0 ) + return nValue2; + else if( nHue < 240.0 ) + return nValue1 + (nValue2 - nValue1)*(240.0 - nHue)/60.0; + else + return nValue1; + } + + RGBColor::RGBTriple hsl2rgb( double nHue, double nSaturation, double nLuminance ) + { + if( ::basegfx::fTools::equalZero( nSaturation ) ) + return RGBColor::RGBTriple(0.0, 0.0, nLuminance ); + + const double nVal1( getMagic(nLuminance, nSaturation) ); + const double nVal2( 2.0*nLuminance - nVal1 ); + + RGBColor::RGBTriple aRes; + + aRes.mnRed = hsl2rgbHelper( nVal2, + nVal1, + nHue + 120.0 ); + aRes.mnGreen = hsl2rgbHelper( nVal2, + nVal1, + nHue ); + aRes.mnBlue = hsl2rgbHelper( nVal2, + nVal1, + nHue - 120.0 ); + + return aRes; + } + + /// Truncate range of value to [0,1] + double truncateRangeStd( double nVal ) + { + return ::std::max( 0.0, + ::std::min( 1.0, + nVal ) ); + } + + /// Truncate range of value to [0,360] + double truncateRangeHue( double nVal ) + { + return ::std::max( 0.0, + ::std::min( 360.0, + nVal ) ); + } + + /// convert RGB color to sal_uInt8, truncate range appropriately before + sal_uInt8 colorToInt( double nCol ) + { + return static_cast< sal_uInt8 >( + ::basegfx::fround( truncateRangeStd( nCol ) * 255.0 ) ); + } + } + + + + // HSLColor + // =============================================== + + HSLColor::HSLTriple::HSLTriple() : + mnHue(), + mnSaturation(), + mnLuminance() + { + } + + HSLColor::HSLTriple::HSLTriple( double nHue, double nSaturation, double nLuminance ) : + mnHue( nHue ), + mnSaturation( nSaturation ), + mnLuminance( nLuminance ) + { + } + + HSLColor::HSLColor() : + maHSLTriple( 0.0, 0.0, 0.0 ), + mnMagicValue( getMagic( maHSLTriple.mnLuminance, + maHSLTriple.mnSaturation ) ) + { + } + + HSLColor::HSLColor( ::cppcanvas::Color::IntSRGBA nRGBColor ) : + maHSLTriple( rgb2hsl( ::cppcanvas::getRed( nRGBColor ) / 255.0, + ::cppcanvas::getGreen( nRGBColor ) / 255.0, + ::cppcanvas::getBlue( nRGBColor ) / 255.0 ) ), + mnMagicValue( getMagic( maHSLTriple.mnLuminance, + maHSLTriple.mnSaturation ) ) + { + } + + HSLColor::HSLColor( double nHue, double nSaturation, double nLuminance ) : + maHSLTriple( nHue, nSaturation, nLuminance ), + mnMagicValue( getMagic( maHSLTriple.mnLuminance, + maHSLTriple.mnSaturation ) ) + { + } + + HSLColor::HSLColor( const RGBColor& rColor ) : + maHSLTriple( rgb2hsl( truncateRangeStd( rColor.getRed() ), + truncateRangeStd( rColor.getGreen() ), + truncateRangeStd( rColor.getBlue() ) ) ), + mnMagicValue( getMagic( maHSLTriple.mnLuminance, + maHSLTriple.mnSaturation ) ) + { + } + + double HSLColor::getHue() const + { + return maHSLTriple.mnHue; + } + + double HSLColor::getSaturation() const + { + return maHSLTriple.mnSaturation; + } + + double HSLColor::getLuminance() const + { + return maHSLTriple.mnLuminance; + } + + double HSLColor::getRed() const + { + if( ::basegfx::fTools::equalZero( getSaturation() ) ) + return getLuminance(); + + return hsl2rgbHelper( 2.0*getLuminance() - mnMagicValue, + mnMagicValue, + getHue() + 120.0 ); + } + + double HSLColor::getGreen() const + { + if( ::basegfx::fTools::equalZero( getSaturation() ) ) + return getLuminance(); + + return hsl2rgbHelper( 2.0*getLuminance() - mnMagicValue, + mnMagicValue, + getHue() ); + } + + double HSLColor::getBlue() const + { + if( ::basegfx::fTools::equalZero( getSaturation() ) ) + return getLuminance(); + + return hsl2rgbHelper( 2.0*getLuminance() - mnMagicValue, + mnMagicValue, + getHue() - 120.0 ); + } + + RGBColor HSLColor::getRGBColor() const + { + RGBColor::RGBTriple aColor( hsl2rgb( getHue(), + getSaturation(), + getLuminance() ) ); + return RGBColor( aColor.mnRed, aColor.mnGreen, aColor.mnBlue ); + } + + RGBColor::RGBColor(const RGBColor& rLHS) + { + RGBColor(rLHS.getRed(), rLHS.getGreen(), rLHS.getBlue()); + } + + RGBColor& RGBColor::operator=( const RGBColor& rLHS ){ + + maRGBTriple.mnRed = rLHS.getRed(); + maRGBTriple.mnGreen = rLHS.getGreen(); + maRGBTriple.mnBlue = rLHS.getBlue(); + return *this; + } + + HSLColor operator+( const HSLColor& rLHS, const HSLColor& rRHS ) + { + return HSLColor( rLHS.getHue() + rRHS.getHue(), + rLHS.getSaturation() + rRHS.getSaturation(), + rLHS.getLuminance() + rRHS.getLuminance() ); + } + + HSLColor operator*( const HSLColor& rLHS, const HSLColor& rRHS ) + { + return HSLColor( rLHS.getHue() * rRHS.getHue(), + rLHS.getSaturation() * rRHS.getSaturation(), + rLHS.getLuminance() * rRHS.getLuminance() ); + } + + HSLColor operator*( double nFactor, const HSLColor& rRHS ) + { + return HSLColor( nFactor * rRHS.getHue(), + nFactor * rRHS.getSaturation(), + nFactor * rRHS.getLuminance() ); + } + + HSLColor interpolate( const HSLColor& rFrom, const HSLColor& rTo, double t, bool bCCW ) + { + const double nFromHue( rFrom.getHue() ); + const double nToHue ( rTo.getHue() ); + + double nHue=0.0; + + if( nFromHue <= nToHue && !bCCW ) + { + // interpolate hue clockwise. That is, hue starts at + // high values and ends at low ones. Therefore, we + // must 'cross' the 360 degrees and start at low + // values again (imagine the hues to lie on the + // circle, where values above 360 degrees are mapped + // back to [0,360)). + nHue = (1.0-t)*(nFromHue + 360.0) + t*nToHue; + } + else if( nFromHue > nToHue && bCCW ) + { + // interpolate hue counter-clockwise. That is, hue + // starts at high values and ends at low + // ones. Therefore, we must 'cross' the 360 degrees + // and start at low values again (imagine the hues to + // lie on the circle, where values above 360 degrees + // are mapped back to [0,360)). + nHue = (1.0-t)*nFromHue + t*(nToHue + 360.0); + } + else + { + // interpolate hue counter-clockwise. That is, hue + // starts at low values and ends at high ones (imagine + // the hue value as degrees on a circle, with + // increasing values going counter-clockwise) + nHue = (1.0-t)*nFromHue + t*nToHue; + } + + return HSLColor( nHue, + (1.0-t)*rFrom.getSaturation() + t*rTo.getSaturation(), + (1.0-t)*rFrom.getLuminance() + t*rTo.getLuminance() ); + } + + + + // RGBColor + // =============================================== + + + RGBColor::RGBTriple::RGBTriple() : + mnRed(), + mnGreen(), + mnBlue() + { + } + + RGBColor::RGBTriple::RGBTriple( double nRed, double nGreen, double nBlue ) : + mnRed( nRed ), + mnGreen( nGreen ), + mnBlue( nBlue ) + { + } + + RGBColor::RGBColor() : + maRGBTriple( 0.0, 0.0, 0.0 ) + { + } + + RGBColor::RGBColor( ::cppcanvas::Color::IntSRGBA nRGBColor ) : + maRGBTriple( ::cppcanvas::getRed( nRGBColor ) / 255.0, + ::cppcanvas::getGreen( nRGBColor ) / 255.0, + ::cppcanvas::getBlue( nRGBColor ) / 255.0 ) + { + } + + RGBColor::RGBColor( double nRed, double nGreen, double nBlue ) : + maRGBTriple( nRed, nGreen, nBlue ) + { + } + + RGBColor::RGBColor( const HSLColor& rColor ) : + maRGBTriple( hsl2rgb( truncateRangeHue( rColor.getHue() ), + truncateRangeStd( rColor.getSaturation() ), + truncateRangeStd( rColor.getLuminance() ) ) ) + { + } + + double RGBColor::getHue() const + { + return rgb2hsl( getRed(), + getGreen(), + getBlue() ).mnHue; + } + + double RGBColor::getSaturation() const + { + return rgb2hsl( getRed(), + getGreen(), + getBlue() ).mnSaturation; + } + + double RGBColor::getLuminance() const + { + return rgb2hsl( getRed(), + getGreen(), + getBlue() ).mnLuminance; + } + + double RGBColor::getRed() const + { + return maRGBTriple.mnRed; + } + + double RGBColor::getGreen() const + { + return maRGBTriple.mnGreen; + } + + double RGBColor::getBlue() const + { + return maRGBTriple.mnBlue; + } + + HSLColor RGBColor::getHSLColor() const + { + HSLColor::HSLTriple aColor( rgb2hsl( getRed(), + getGreen(), + getBlue() ) ); + return HSLColor( aColor.mnHue, aColor.mnSaturation, aColor.mnLuminance ); + } + + ::cppcanvas::Color::IntSRGBA RGBColor::getIntegerColor() const + { + return ::cppcanvas::makeColor( colorToInt( getRed() ), + colorToInt( getGreen() ), + colorToInt( getBlue() ), + 255 ); + } + + RGBColor operator+( const RGBColor& rLHS, const RGBColor& rRHS ) + { + return RGBColor( rLHS.getRed() + rRHS.getRed(), + rLHS.getGreen() + rRHS.getGreen(), + rLHS.getBlue() + rRHS.getBlue() ); + } + + RGBColor operator*( const RGBColor& rLHS, const RGBColor& rRHS ) + { + return RGBColor( rLHS.getRed() * rRHS.getRed(), + rLHS.getGreen() * rRHS.getGreen(), + rLHS.getBlue() * rRHS.getBlue() ); + } + + RGBColor operator*( double nFactor, const RGBColor& rRHS ) + { + return RGBColor( nFactor * rRHS.getRed(), + nFactor * rRHS.getGreen(), + nFactor * rRHS.getBlue() ); + } + + RGBColor interpolate( const RGBColor& rFrom, const RGBColor& rTo, double t ) + { + return RGBColor( (1.0-t)*rFrom.getRed() + t*rTo.getRed(), + (1.0-t)*rFrom.getGreen() + t*rTo.getGreen(), + (1.0-t)*rFrom.getBlue() + t*rTo.getBlue() ); + } + } +} |