///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2002-2012, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
//
// All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
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// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
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// in the documentation and/or other materials provided with the
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///////////////////////////////////////////////////////////////////////////
#ifndef INCLUDED_IMATHCOLORALGO_H
#define INCLUDED_IMATHCOLORALGO_H
#include "ImathColor.h"
#include "ImathExport.h"
#include "ImathMath.h"
#include "ImathLimits.h"
#include "ImathNamespace.h"
IMATH_INTERNAL_NAMESPACE_HEADER_ENTER
//
// Non-templated helper routines for color conversion.
// These routines eliminate type warnings under g++.
//
IMATH_EXPORT Vec3<double> hsv2rgb_d(const Vec3<double> &hsv);
IMATH_EXPORT Color4<double> hsv2rgb_d(const Color4<double> &hsv);
IMATH_EXPORT Vec3<double> rgb2hsv_d(const Vec3<double> &rgb);
IMATH_EXPORT Color4<double> rgb2hsv_d(const Color4<double> &rgb);
//
// Color conversion functions and general color algorithms
//
// hsv2rgb(), rgb2hsv(), rgb2packed(), packed2rgb()
// see each funtion definition for details.
//
template<class T>
Vec3<T>
hsv2rgb(const Vec3<T> &hsv)
{
if ( limits<T>::isIntegral() )
{
Vec3<double> v = Vec3<double>(hsv.x / double(limits<T>::max()),
hsv.y / double(limits<T>::max()),
hsv.z / double(limits<T>::max()));
Vec3<double> c = hsv2rgb_d(v);
return Vec3<T>((T) (c.x * limits<T>::max()),
(T) (c.y * limits<T>::max()),
(T) (c.z * limits<T>::max()));
}
else
{
Vec3<double> v = Vec3<double>(hsv.x, hsv.y, hsv.z);
Vec3<double> c = hsv2rgb_d(v);
return Vec3<T>((T) c.x, (T) c.y, (T) c.z);
}
}
template<class T>
Color4<T>
hsv2rgb(const Color4<T> &hsv)
{
if ( limits<T>::isIntegral() )
{
Color4<double> v = Color4<double>(hsv.r / float(limits<T>::max()),
hsv.g / float(limits<T>::max()),
hsv.b / float(limits<T>::max()),
hsv.a / float(limits<T>::max()));
Color4<double> c = hsv2rgb_d(v);
return Color4<T>((T) (c.r * limits<T>::max()),
(T) (c.g * limits<T>::max()),
(T) (c.b * limits<T>::max()),
(T) (c.a * limits<T>::max()));
}
else
{
Color4<double> v = Color4<double>(hsv.r, hsv.g, hsv.b, hsv.a);
Color4<double> c = hsv2rgb_d(v);
return Color4<T>((T) c.r, (T) c.g, (T) c.b, (T) c.a);
}
}
template<class T>
Vec3<T>
rgb2hsv(const Vec3<T> &rgb)
{
if ( limits<T>::isIntegral() )
{
Vec3<double> v = Vec3<double>(rgb.x / double(limits<T>::max()),
rgb.y / double(limits<T>::max()),
rgb.z / double(limits<T>::max()));
Vec3<double> c = rgb2hsv_d(v);
return Vec3<T>((T) (c.x * limits<T>::max()),
(T) (c.y * limits<T>::max()),
(T) (c.z * limits<T>::max()));
}
else
{
Vec3<double> v = Vec3<double>(rgb.x, rgb.y, rgb.z);
Vec3<double> c = rgb2hsv_d(v);
return Vec3<T>((T) c.x, (T) c.y, (T) c.z);
}
}
template<class T>
Color4<T>
rgb2hsv(const Color4<T> &rgb)
{
if ( limits<T>::isIntegral() )
{
Color4<double> v = Color4<double>(rgb.r / float(limits<T>::max()),
rgb.g / float(limits<T>::max()),
rgb.b / float(limits<T>::max()),
rgb.a / float(limits<T>::max()));
Color4<double> c = rgb2hsv_d(v);
return Color4<T>((T) (c.r * limits<T>::max()),
(T) (c.g * limits<T>::max()),
(T) (c.b * limits<T>::max()),
(T) (c.a * limits<T>::max()));
}
else
{
Color4<double> v = Color4<double>(rgb.r, rgb.g, rgb.b, rgb.a);
Color4<double> c = rgb2hsv_d(v);
return Color4<T>((T) c.r, (T) c.g, (T) c.b, (T) c.a);
}
}
template <class T>
PackedColor
rgb2packed(const Vec3<T> &c)
{
if ( limits<T>::isIntegral() )
{
float x = c.x / float(limits<T>::max());
float y = c.y / float(limits<T>::max());
float z = c.z / float(limits<T>::max());
return rgb2packed( V3f(x,y,z) );
}
else
{
return ( (PackedColor) (c.x * 255) |
(((PackedColor) (c.y * 255)) << 8) |
(((PackedColor) (c.z * 255)) << 16) | 0xFF000000 );
}
}
template <class T>
PackedColor
rgb2packed(const Color4<T> &c)
{
if ( limits<T>::isIntegral() )
{
float r = c.r / float(limits<T>::max());
float g = c.g / float(limits<T>::max());
float b = c.b / float(limits<T>::max());
float a = c.a / float(limits<T>::max());
return rgb2packed( C4f(r,g,b,a) );
}
else
{
return ( (PackedColor) (c.r * 255) |
(((PackedColor) (c.g * 255)) << 8) |
(((PackedColor) (c.b * 255)) << 16) |
(((PackedColor) (c.a * 255)) << 24));
}
}
//
// This guy can't return the result because the template
// parameter would not be in the function signiture. So instead,
// its passed in as an argument.
//
template <class T>
void
packed2rgb(PackedColor packed, Vec3<T> &out)
{
if ( limits<T>::isIntegral() )
{
T f = limits<T>::max() / ((PackedColor)0xFF);
out.x = (packed & 0xFF) * f;
out.y = ((packed & 0xFF00) >> 8) * f;
out.z = ((packed & 0xFF0000) >> 16) * f;
}
else
{
T f = T(1) / T(255);
out.x = (packed & 0xFF) * f;
out.y = ((packed & 0xFF00) >> 8) * f;
out.z = ((packed & 0xFF0000) >> 16) * f;
}
}
template <class T>
void
packed2rgb(PackedColor packed, Color4<T> &out)
{
if ( limits<T>::isIntegral() )
{
T f = limits<T>::max() / ((PackedColor)0xFF);
out.r = (packed & 0xFF) * f;
out.g = ((packed & 0xFF00) >> 8) * f;
out.b = ((packed & 0xFF0000) >> 16) * f;
out.a = ((packed & 0xFF000000) >> 24) * f;
}
else
{
T f = T(1) / T(255);
out.r = (packed & 0xFF) * f;
out.g = ((packed & 0xFF00) >> 8) * f;
out.b = ((packed & 0xFF0000) >> 16) * f;
out.a = ((packed & 0xFF000000) >> 24) * f;
}
}
IMATH_INTERNAL_NAMESPACE_HEADER_EXIT
#endif // INCLUDED_IMATHCOLORALGO_H