ea9904c896
Change-Id: I7447e649dc3ef4e51242f69c7486a3e84e103d2e Reviewed-on: https://gerrit.libreoffice.org/c/core/+/166159 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
267 lines
7.7 KiB
C++
267 lines
7.7 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <sal/config.h>
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#include <algorithm>
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#include <iomanip>
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#include <sstream>
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#include <stdlib.h>
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#include <tools/color.hxx>
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#include <tools/helpers.hxx>
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#include <tools/long.hxx>
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#include <o3tl/string_view.hxx>
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#include <basegfx/color/bcolortools.hxx>
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#include <basegfx/numeric/ftools.hxx>
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void Color::IncreaseLuminance(sal_uInt8 cLumInc)
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{
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R = sal_uInt8(std::clamp(R + cLumInc, 0, 255));
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G = sal_uInt8(std::clamp(G + cLumInc, 0, 255));
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B = sal_uInt8(std::clamp(B + cLumInc, 0, 255));
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}
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void Color::DecreaseLuminance(sal_uInt8 cLumDec)
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{
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R = sal_uInt8(std::clamp(R - cLumDec, 0, 255));
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G = sal_uInt8(std::clamp(G - cLumDec, 0, 255));
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B = sal_uInt8(std::clamp(B - cLumDec, 0, 255));
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}
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void Color::DecreaseContrast(sal_uInt8 nContDec)
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{
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if (nContDec)
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{
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const double fM = (128.0 - 0.4985 * nContDec) / 128.0;
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const double fOff = 128.0 - fM * 128.0;
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R = basegfx::fround<sal_uInt8>(R * fM + fOff);
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G = basegfx::fround<sal_uInt8>(G * fM + fOff);
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B = basegfx::fround<sal_uInt8>(B * fM + fOff);
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}
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}
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// color space conversion
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void Color::RGBtoHSB( sal_uInt16& nHue, sal_uInt16& nSat, sal_uInt16& nBri ) const
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{
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sal_uInt8 c[3];
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sal_uInt8 cMax, cMin;
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c[0] = R;
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c[1] = G;
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c[2] = B;
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cMax = c[0];
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if( c[1] > cMax )
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cMax = c[1];
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if( c[2] > cMax )
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cMax = c[2];
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// Brightness = max(R, G, B);
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nBri = cMax * 100 / 255;
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cMin = c[0];
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if( c[1] < cMin )
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cMin = c[1];
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if( c[2] < cMin )
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cMin = c[2];
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sal_uInt8 cDelta = cMax - cMin;
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// Saturation = max - min / max
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if( nBri > 0 )
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nSat = cDelta * 100 / cMax;
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else
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nSat = 0;
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if( nSat == 0 )
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nHue = 0; // Default = undefined
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else
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{
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double dHue = 0.0;
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if( c[0] == cMax )
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{
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dHue = static_cast<double>( c[1] - c[2] ) / static_cast<double>(cDelta);
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}
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else if( c[1] == cMax )
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{
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dHue = 2.0 + static_cast<double>( c[2] - c[0] ) / static_cast<double>(cDelta);
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}
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else if ( c[2] == cMax )
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{
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dHue = 4.0 + static_cast<double>( c[0] - c[1] ) / static_cast<double>(cDelta);
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}
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dHue *= 60.0;
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if( dHue < 0.0 )
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dHue += 360.0;
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nHue = static_cast<sal_uInt16>(dHue);
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}
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}
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Color Color::HSBtoRGB( sal_uInt16 nHue, sal_uInt16 nSat, sal_uInt16 nBri )
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{
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sal_uInt8 cR=0,cG=0,cB=0;
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sal_uInt8 nB = static_cast<sal_uInt8>( nBri * 255 / 100 );
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if( nSat == 0 )
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{
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cR = nB;
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cG = nB;
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cB = nB;
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}
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else
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{
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double dH = nHue;
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double f;
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sal_uInt16 n;
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if( dH == 360.0 )
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dH = 0.0;
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dH /= 60.0;
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n = static_cast<sal_uInt16>(dH);
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f = dH - n;
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sal_uInt8 a = static_cast<sal_uInt8>( nB * ( 100 - nSat ) / 100 );
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sal_uInt8 b = static_cast<sal_uInt8>( nB * ( 100 - ( static_cast<double>(nSat) * f ) ) / 100 );
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sal_uInt8 c = static_cast<sal_uInt8>( nB * ( 100 - ( static_cast<double>(nSat) * ( 1.0 - f ) ) ) / 100 );
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switch( n )
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{
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case 0: cR = nB; cG = c; cB = a; break;
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case 1: cR = b; cG = nB; cB = a; break;
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case 2: cR = a; cG = nB; cB = c; break;
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case 3: cR = a; cG = b; cB = nB; break;
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case 4: cR = c; cG = a; cB = nB; break;
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case 5: cR = nB; cG = a; cB = b; break;
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}
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}
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return Color( cR, cG, cB );
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}
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Color Color::STRtoRGB(std::u16string_view colorname)
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{
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Color col;
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if(colorname.empty()) return col;
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switch(colorname.size()){
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case 7:
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col.mValue = o3tl::toUInt32(colorname.substr(1,6), 16);
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break;
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case 6:
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col.mValue = o3tl::toUInt32(colorname, 16);
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break;
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case 4:
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{
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sal_Unicode data[6] = { colorname[1], colorname[1], colorname[2],
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colorname[2], colorname[3], colorname[3] };
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col.mValue = o3tl::toUInt32(std::u16string_view(data,6), 16);
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break;
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}
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case 3:
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{
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sal_Unicode data[6] = { colorname[0], colorname[0], colorname[1],
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colorname[1], colorname[2], colorname[2] };
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col.mValue = o3tl::toUInt32(std::u16string_view(data,6), 16);
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break;
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}
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default:
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break;
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}
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return col;
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}
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OUString Color::AsRGBHexString() const
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{
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std::stringstream ss;
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ss << std::hex << std::setfill ('0') << std::setw(6) << sal_uInt32(GetRGBColor());
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return OUString::createFromAscii(ss.str());
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}
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OUString Color::AsRGBHEXString() const
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{
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std::stringstream ss;
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ss << std::hex << std::uppercase << std::setfill ('0') << std::setw(6) << sal_uInt32(GetRGBColor());
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return OUString::createFromAscii(ss.str());
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}
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void Color::ApplyTintOrShade(sal_Int16 n100thPercent)
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{
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if (n100thPercent == 0)
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return;
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basegfx::BColor aBColor = basegfx::utils::rgb2hsl(getBColor());
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double fFactor = 1.0 - (std::abs(double(n100thPercent)) / 10000.0);
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double fResult;
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if (n100thPercent > 0) // tint
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{
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fResult = aBColor.getBlue() * fFactor + (1.0 - fFactor);
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}
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else // shade
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{
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fResult = aBColor.getBlue() * fFactor;
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}
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aBColor.setBlue(fResult);
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aBColor = basegfx::utils::hsl2rgb(aBColor);
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R = sal_uInt8(std::lround(aBColor.getRed() * 255.0));
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G = sal_uInt8(std::lround(aBColor.getGreen() * 255.0));
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B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0));
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}
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void Color::ApplyLumModOff(sal_Int16 nMod, sal_Int16 nOff)
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{
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if (nMod == 10000 && nOff == 0)
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{
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return;
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}
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// Switch to HSL, where applying these transforms is easier.
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basegfx::BColor aBColor = basegfx::utils::rgb2hsl(getBColor());
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// 50% is half luminance, 200% is double luminance. Unit is 100th percent.
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aBColor.setBlue(std::clamp(aBColor.getBlue() * nMod / 10000, 0.0, 1.0));
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// If color changes to black or white, it will stay gray if luminance changes again.
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if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0))
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{
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aBColor.setGreen(0.0);
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}
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// Luminance offset means hue and saturation is left unchanged. Unit is 100th percent.
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aBColor.setBlue(std::clamp(aBColor.getBlue() + static_cast<double>(nOff) / 10000, 0.0, 1.0));
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// If color changes to black or white, it will stay gray if luminance changes again.
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if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0))
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{
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aBColor.setGreen(0.0);
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}
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// Switch back to RGB.
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aBColor = basegfx::utils::hsl2rgb(aBColor);
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R = sal_uInt8(std::lround(aBColor.getRed() * 255.0));
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G = sal_uInt8(std::lround(aBColor.getGreen() * 255.0));
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B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0));
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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