MagickExport void ConvertHSLToRGB(const double hue,const double saturation,
const double lightness,Quantum *red,Quantum *green,Quantum *blue)
{
MagickRealType
b,
g,
r,
m1,
m2;
/*
Convert HSL to RGB colorspace.
*/
assert(red != (Quantum *) NULL);
assert(green != (Quantum *) NULL);
assert(blue != (Quantum *) NULL);
if (saturation == 0)
{
*red=ClampToQuantum((MagickRealType) QuantumRange*lightness);
*green=(*red);
*blue=(*red);
return;
}
if (lightness < 0.5)
m2=lightness*(saturation+1.0);
else
m2=(lightness+saturation)-(lightness*saturation);
m1=2.0*lightness-m2;
r=ConvertHueToRGB(m1,m2,hue+1.0/3.0);
g=ConvertHueToRGB(m1,m2,hue);
b=ConvertHueToRGB(m1,m2,hue-1.0/3.0);
*red=ClampToQuantum((MagickRealType) QuantumRange*r);
*green=ClampToQuantum((MagickRealType) QuantumRange*g);
*blue=ClampToQuantum((MagickRealType) QuantumRange*b);
}
MagickExport void ConvertHSLToRGB(const double hue,const double saturation,
const double lightness,double *red,double *green,double *blue)
{
double
b,
g,
r,
m1,
m2;
/*
Convert HSL to RGB colorspace.
*/
assert(red != (double *) NULL);
assert(green != (double *) NULL);
assert(blue != (double *) NULL);
if (saturation == 0)
{
*red=QuantumRange*lightness;
*green=(*red);
*blue=(*red);
return;
}
if (lightness < 0.5)
m2=lightness*(saturation+1.0);
else
m2=(lightness+saturation)-(lightness*saturation);
m1=2.0*lightness-m2;
r=ConvertHueToRGB(m1,m2,hue+1.0/3.0);
g=ConvertHueToRGB(m1,m2,hue);
b=ConvertHueToRGB(m1,m2,hue-1.0/3.0);
*red=QuantumRange*r;
*green=QuantumRange*g;
*blue=QuantumRange*b;
}
