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Diffstat (limited to 'tools/source/generic/color.cxx')
| -rw-r--r-- | tools/source/generic/color.cxx | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/tools/source/generic/color.cxx b/tools/source/generic/color.cxx new file mode 100644 index 000000000..1c740f03d --- /dev/null +++ b/tools/source/generic/color.cxx @@ -0,0 +1,266 @@ +/* -*- 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 <sal/config.h> + +#include <algorithm> +#include <iomanip> +#include <sstream> +#include <stdlib.h> + +#include <tools/color.hxx> +#include <tools/helpers.hxx> +#include <tools/long.hxx> +#include <o3tl/string_view.hxx> +#include <basegfx/color/bcolortools.hxx> + +void Color::IncreaseLuminance(sal_uInt8 cLumInc) +{ + R = sal_uInt8(std::clamp(R + cLumInc, 0, 255)); + G = sal_uInt8(std::clamp(G + cLumInc, 0, 255)); + B = sal_uInt8(std::clamp(B + cLumInc, 0, 255)); +} + +void Color::DecreaseLuminance(sal_uInt8 cLumDec) +{ + R = sal_uInt8(std::clamp(R - cLumDec, 0, 255)); + G = sal_uInt8(std::clamp(G - cLumDec, 0, 255)); + B = sal_uInt8(std::clamp(B - cLumDec, 0, 255)); +} + +void Color::DecreaseContrast(sal_uInt8 nContDec) +{ + if (nContDec) + { + const double fM = (128.0 - 0.4985 * nContDec) / 128.0; + const double fOff = 128.0 - fM * 128.0; + + R = sal_uInt8(std::clamp(FRound(R * fM + fOff), tools::Long(0), tools::Long(255))); + G = sal_uInt8(std::clamp(FRound(G * fM + fOff), tools::Long(0), tools::Long(255))); + B = sal_uInt8(std::clamp(FRound(B * fM + fOff), tools::Long(0), tools::Long(255))); + } +} + +// color space conversion + +void Color::RGBtoHSB( sal_uInt16& nHue, sal_uInt16& nSat, sal_uInt16& nBri ) const +{ + sal_uInt8 c[3]; + sal_uInt8 cMax, cMin; + + c[0] = R; + c[1] = G; + c[2] = B; + + cMax = c[0]; + if( c[1] > cMax ) + cMax = c[1]; + if( c[2] > cMax ) + cMax = c[2]; + + // Brightness = max(R, G, B); + nBri = cMax * 100 / 255; + + cMin = c[0]; + if( c[1] < cMin ) + cMin = c[1]; + if( c[2] < cMin ) + cMin = c[2]; + + sal_uInt8 cDelta = cMax - cMin; + + // Saturation = max - min / max + if( nBri > 0 ) + nSat = cDelta * 100 / cMax; + else + nSat = 0; + + if( nSat == 0 ) + nHue = 0; // Default = undefined + else + { + double dHue = 0.0; + + if( c[0] == cMax ) + { + dHue = static_cast<double>( c[1] - c[2] ) / static_cast<double>(cDelta); + } + else if( c[1] == cMax ) + { + dHue = 2.0 + static_cast<double>( c[2] - c[0] ) / static_cast<double>(cDelta); + } + else if ( c[2] == cMax ) + { + dHue = 4.0 + static_cast<double>( c[0] - c[1] ) / static_cast<double>(cDelta); + } + dHue *= 60.0; + + if( dHue < 0.0 ) + dHue += 360.0; + + nHue = static_cast<sal_uInt16>(dHue); + } +} + +Color Color::HSBtoRGB( sal_uInt16 nHue, sal_uInt16 nSat, sal_uInt16 nBri ) +{ + sal_uInt8 cR=0,cG=0,cB=0; + sal_uInt8 nB = static_cast<sal_uInt8>( nBri * 255 / 100 ); + + if( nSat == 0 ) + { + cR = nB; + cG = nB; + cB = nB; + } + else + { + double dH = nHue; + double f; + sal_uInt16 n; + if( dH == 360.0 ) + dH = 0.0; + + dH /= 60.0; + n = static_cast<sal_uInt16>(dH); + f = dH - n; + + sal_uInt8 a = static_cast<sal_uInt8>( nB * ( 100 - nSat ) / 100 ); + sal_uInt8 b = static_cast<sal_uInt8>( nB * ( 100 - ( static_cast<double>(nSat) * f ) ) / 100 ); + sal_uInt8 c = static_cast<sal_uInt8>( nB * ( 100 - ( static_cast<double>(nSat) * ( 1.0 - f ) ) ) / 100 ); + + switch( n ) + { + case 0: cR = nB; cG = c; cB = a; break; + case 1: cR = b; cG = nB; cB = a; break; + case 2: cR = a; cG = nB; cB = c; break; + case 3: cR = a; cG = b; cB = nB; break; + case 4: cR = c; cG = a; cB = nB; break; + case 5: cR = nB; cG = a; cB = b; break; + } + } + + return Color( cR, cG, cB ); +} + +Color Color::STRtoRGB(std::u16string_view colorname) +{ + Color col; + if(colorname.empty()) return col; + + switch(colorname.size()){ + case 7: + col.mValue = o3tl::toUInt32(colorname.substr(1,6), 16); + break; + case 6: + col.mValue = o3tl::toUInt32(colorname, 16); + break; + case 4: + { + sal_Unicode data[6] = { colorname[1], colorname[1], colorname[2], + colorname[2], colorname[3], colorname[3] }; + col.mValue = o3tl::toUInt32(std::u16string_view(data,6), 16); + break; + } + case 3: + { + sal_Unicode data[6] = { colorname[0], colorname[0], colorname[1], + colorname[1], colorname[2], colorname[2] }; + col.mValue = o3tl::toUInt32(std::u16string_view(data,6), 16); + break; + } + default: + break; + } + return col; +} + +OUString Color::AsRGBHexString() const +{ + std::stringstream ss; + ss << std::hex << std::setfill ('0') << std::setw(6) << sal_uInt32(GetRGBColor()); + return OUString::createFromAscii(ss.str().c_str()); +} + +OUString Color::AsRGBHEXString() const +{ + std::stringstream ss; + ss << std::hex << std::uppercase << std::setfill ('0') << std::setw(6) << sal_uInt32(GetRGBColor()); + return OUString::createFromAscii(ss.str().c_str()); +} + +void Color::ApplyTintOrShade(sal_Int16 n100thPercent) +{ + if (n100thPercent == 0) + return; + + basegfx::BColor aBColor = basegfx::utils::rgb2hsl(getBColor()); + double fFactor = 1.0 - (std::abs(double(n100thPercent)) / 10000.0); + double fResult; + + if (n100thPercent > 0) // tint + { + fResult = aBColor.getBlue() * fFactor + (1.0 - fFactor); + } + else // shade + { + fResult = aBColor.getBlue() * fFactor; + } + + aBColor.setBlue(fResult); + aBColor = basegfx::utils::hsl2rgb(aBColor); + + R = sal_uInt8(std::lround(aBColor.getRed() * 255.0)); + G = sal_uInt8(std::lround(aBColor.getGreen() * 255.0)); + B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0)); +} + +void Color::ApplyLumModOff(sal_Int16 nMod, sal_Int16 nOff) +{ + if (nMod == 10000 && nOff == 0) + { + return; + } + // Switch to HSL, where applying these transforms is easier. + basegfx::BColor aBColor = basegfx::utils::rgb2hsl(getBColor()); + + // 50% is half luminance, 200% is double luminance. Unit is 100th percent. + aBColor.setBlue(std::clamp(aBColor.getBlue() * nMod / 10000, 0.0, 1.0)); + // If color changes to black or white, it will stay gray if luminance changes again. + if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0)) + { + aBColor.setGreen(0.0); + } + + // Luminance offset means hue and saturation is left unchanged. Unit is 100th percent. + aBColor.setBlue(std::clamp(aBColor.getBlue() + static_cast<double>(nOff) / 10000, 0.0, 1.0)); + // If color changes to black or white, it will stay gray if luminance changes again. + if ((aBColor.getBlue() == 0.0) || (aBColor.getBlue() == 1.0)) + { + aBColor.setGreen(0.0); + } + + // Switch back to RGB. + aBColor = basegfx::utils::hsl2rgb(aBColor); + R = sal_uInt8(std::lround(aBColor.getRed() * 255.0)); + G = sal_uInt8(std::lround(aBColor.getGreen() * 255.0)); + B = sal_uInt8(std::lround(aBColor.getBlue() * 255.0)); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |