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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:51:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 16:51:28 +0000 |
commit | 940b4d1848e8c70ab7642901a68594e8016caffc (patch) | |
tree | eb72f344ee6c3d9b80a7ecc079ea79e9fba8676d /slideshow/source/engine/color.cxx | |
parent | Initial commit. (diff) | |
download | libreoffice-upstream/1%7.0.4.tar.xz libreoffice-upstream/1%7.0.4.zip |
Adding upstream version 1:7.0.4.upstream/1%7.0.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'slideshow/source/engine/color.cxx')
-rw-r--r-- | slideshow/source/engine/color.cxx | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/slideshow/source/engine/color.cxx b/slideshow/source/engine/color.cxx new file mode 100644 index 000000000..1109d4e68 --- /dev/null +++ b/slideshow/source/engine/color.cxx @@ -0,0 +1,348 @@ +/* -*- 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 . + */ + + +#include <hslcolor.hxx> +#include <rgbcolor.hxx> + +#include <basegfx/numeric/ftools.hxx> +#include <rtl/math.hxx> + +#include <cmath> +#include <algorithm> + + +namespace slideshow::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( rtl::math::approxEqual(nRed, nMax) ) + aRes.mnHue = (nGreen - nBlue)/nDelta; + else if( rtl::math::approxEqual(nGreen, nMax) ) + aRes.mnHue = 2.0 + (nBlue - nRed)/nDelta; + else if( rtl::math::approxEqual(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 ) + { + } + + HSLColor::HSLColor( double nHue, double nSaturation, double nLuminance ) : + maHSLTriple( nHue, nSaturation, nLuminance ) + { + } + + HSLColor::HSLColor( const RGBColor& rColor ) : + maHSLTriple( rgb2hsl( truncateRangeStd( rColor.getRed() ), + truncateRangeStd( rColor.getGreen() ), + truncateRangeStd( rColor.getBlue() ) ) ) + { + } + + + bool operator==( const HSLColor& rLHS, const HSLColor& rRHS ) + { + return ( rLHS.getHue() == rRHS.getHue() && + rLHS.getSaturation() == rRHS.getSaturation() && + rLHS.getLuminance() == rRHS.getLuminance() ); + } + + bool operator!=( const HSLColor& rLHS, const HSLColor& rRHS ) + { + return !( rLHS == rRHS ); + } + + 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::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() ) ) ) + { + } + + + ::cppcanvas::IntSRGBA RGBColor::getIntegerColor() const + { + return ::cppcanvas::makeColor( colorToInt( getRed() ), + colorToInt( getGreen() ), + colorToInt( getBlue() ), + 255 ); + } + + bool operator==( const RGBColor& rLHS, const RGBColor& rRHS ) + { + return ( rLHS.getRed() == rRHS.getRed() && + rLHS.getGreen() == rRHS.getGreen() && + rLHS.getBlue() == rRHS.getBlue() ); + } + + bool operator!=( const RGBColor& rLHS, const RGBColor& rRHS ) + { + return !( rLHS == rRHS ); + } + + 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() ); + } +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |