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Diffstat (limited to 'basegfx/source/color/bcolortools.cxx')
-rw-r--r-- | basegfx/source/color/bcolortools.cxx | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/basegfx/source/color/bcolortools.cxx b/basegfx/source/color/bcolortools.cxx new file mode 100644 index 000000000000..543097de3d77 --- /dev/null +++ b/basegfx/source/color/bcolortools.cxx @@ -0,0 +1,268 @@ +/************************************************************************* + * + * 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_basegfx.hxx" + +#include <basegfx/numeric/ftools.hxx> +#include <basegfx/color/bcolor.hxx> +#include <basegfx/color/bcolortools.hxx> + +////////////////////////////////////////////////////////////////////////////// + +namespace basegfx { namespace tools +{ + BColor rgb2hsl(const BColor& rRGBColor) + { + const double r=rRGBColor.getRed(), g=rRGBColor.getGreen(), b=rRGBColor.getBlue(); + const double minVal = ::std::min( ::std::min( r, g ), b ); + const double maxVal = ::std::max( ::std::max( r, g ), b ); + const double d = maxVal - minVal; + + double h=0, s=0, l=0; + + l = (maxVal + minVal) / 2.0; + + if( ::basegfx::fTools::equalZero(d) ) + { + s = h = 0; // hue undefined (achromatic case) + } + else + { + s = l > 0.5 ? d/(2.0-maxVal-minVal) : + d/(maxVal + minVal); + + if( r == maxVal ) + h = (g - b)/d; + else if( g == maxVal ) + h = 2.0 + (b - r)/d; + else + h = 4.0 + (r - g)/d; + + h *= 60.0; + + if( h < 0.0 ) + h += 360.0; + } + + return BColor(h,s,l); + } + + static inline 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; + } + + BColor hsl2rgb(const BColor& rHSLColor) + { + const double h=rHSLColor.getRed(), s=rHSLColor.getGreen(), l=rHSLColor.getBlue(); + + if( fTools::equalZero(s) ) + return BColor(l, l, l ); // achromatic case + + const double nVal1( l <= 0.5 ? l*(1.0 + s) : l + s - l*s ); + const double nVal2( 2.0*l - nVal1 ); + + return BColor( + hsl2rgbHelper(nVal2, + nVal1, + h + 120.0), + hsl2rgbHelper(nVal2, + nVal1, + h), + hsl2rgbHelper(nVal2, + nVal1, + h - 120.0) ); + } + + BColor rgb2hsv(const BColor& rRGBColor) + { + const double r=rRGBColor.getRed(), g=rRGBColor.getGreen(), b=rRGBColor.getBlue(); + const double maxVal = std::max(std::max(r,g),b); + const double minVal = std::min(std::min(r,g),b); + const double delta = maxVal-minVal; + + double h=0, s=0, v=0; + + v = maxVal; + if( fTools::equalZero(v) ) + s = 0; + else + s = delta / v; + + if( !fTools::equalZero(s) ) + { + if( maxVal == r ) + { + h = (g - b) / delta; + } + else if( maxVal == g ) + { + h = 2.0 + (b - r) / delta; + } + else + { + h = 4.0 + (r - g) / delta; + } + + h *= 60.0; + + if( h < 0 ) + h += 360; + } + + return BColor(h,s,v); + } + + BColor hsv2rgb(const BColor& rHSVColor) + { + double h=rHSVColor.getRed(); + const double s=rHSVColor.getGreen(), v=rHSVColor.getBlue(); + + if( fTools::equalZero(s) ) + { + // achromatic case: no hue. + return BColor(v,v,v); + } + else + { + if( fTools::equal(h,360) ) + h = 0; // 360 degrees is equivalent to 0 degrees + + h /= 60.0; + const sal_Int32 intval = static_cast< sal_Int32 >( h ); + const double f = h - intval; + const double p = v*(1.0-s); + const double q = v*(1.0-(s*f)); + const double t = v*(1.0-(s*(1.0-f))); + + /* which hue area? */ + switch( intval ) + { + case 0: + return BColor(v,t,p); + + case 1: + return BColor(q,v,p); + + case 2: + return BColor(p,v,t); + + case 3: + return BColor(p,q,v); + + case 4: + return BColor(t,p,v); + + case 5: + return BColor(v,p,q); + + default: + // hue overflow + return BColor(); + } + } + } + + BColor rgb2yiq(const BColor& rRGBColor) + { + // from Foley, van Dam, Computer Graphics + const double r=rRGBColor.getRed(), g=rRGBColor.getGreen(), b=rRGBColor.getBlue(); + return BColor( + 0.299*r + 0.587*g + 0.114*b, + 0.596*r - 0.274*g - 0.322*b, + 0.211*r - 0.522*g + 0.311*b); + } + + BColor yiq2rgb(const BColor& rYIQColor) + { + // from Foley, van Dam, Computer Graphics + const double y=rYIQColor.getRed(), i=rYIQColor.getGreen(), q=rYIQColor.getBlue(); + return BColor( + y + 0.956*i + 0.623*q, + y - 0.272*i - 0.648*q, + y - 1.105*i + 1.705*q ); + } + + BColor ciexyz2rgb( const BColor& rXYZColor ) + { + // from Poynton color faq, and SMPTE RP 177-1993, Derivation + // of Basic Television Color Equations + const double x=rXYZColor.getRed(), y=rXYZColor.getGreen(), z=rXYZColor.getBlue(); + return BColor( + 3.240479*x - 1.53715*y - 0.498535*z, + -0.969256*x + 1.875991*y + 0.041556*z, + 0.055648*x - 0.204043*y + 1.057311*z ); + } + + BColor rgb2ciexyz( const BColor& rRGBColor ) + { + // from Poynton color faq, and SMPTE RP 177-1993, Derivation + // of Basic Television Color Equations + const double r=rRGBColor.getRed(), g=rRGBColor.getGreen(), b=rRGBColor.getBlue(); + return BColor( + 0.412453*r + 0.35758*g + 0.180423*b, + 0.212671*r + 0.71516*g + 0.072169*b, + 0.019334*r + 0.119193*g + 0.950227*b); + } + + BColor rgb2ypbpr(const BColor& rRGBColor) + { + const double r=rRGBColor.getRed(), g=rRGBColor.getGreen(), b=rRGBColor.getBlue(); + return BColor( + 0.299*r + 0.587*g + 0.114*b, + -0.168736*r - 0.331264*g + 0.5*b, + 0.5*r - 0.418688*g - 0.081312*b); + } + + BColor ypbpr2rgb(const BColor& rYPbPrColor) + { + const double y=rYPbPrColor.getRed(), pb=rYPbPrColor.getGreen(), pr=rYPbPrColor.getBlue(); + return BColor( + 1.*y + 0.*pb + 1.402*pr, + 1.*y - 0.344136*pb - 0.714136*pr, + 1.*y + 1.772*pb + 0.*pr); + } + +} } // end of namespace basegfx + +////////////////////////////////////////////////////////////////////////////// +// eof |