晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/OpenEXR/ImfChromaticities.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2003, Industrial Light & Magic, a division of Lucas
// Digital Ltd. LLC
// 
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
// *       Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// *       Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// *       Neither the name of Industrial Light & Magic nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
///////////////////////////////////////////////////////////////////////////


#ifndef INCLUDED_IMF_CHROMATICITIES_H
#define INCLUDED_IMF_CHROMATICITIES_H

//-----------------------------------------------------------------------------
//
//	CIE (x,y) chromaticities, and conversions between
//	RGB tiples and CIE XYZ tristimulus values.
//
//-----------------------------------------------------------------------------

#include "ImathVec.h"
#include "ImathMatrix.h"
#include "ImfNamespace.h"
#include "ImfExport.h"


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER

   
struct IMF_EXPORT Chromaticities
{
    //-----------------------------------------------
    // The CIE x and y coordinates of the RGB triples
    // (1,0,0), (0,1,0), (0,0,1) and (1,1,1).
    //-----------------------------------------------

    IMATH_NAMESPACE::V2f	red;
    IMATH_NAMESPACE::V2f	green;
    IMATH_NAMESPACE::V2f	blue;
    IMATH_NAMESPACE::V2f	white;

    //--------------------------------------------
    // Default constructor produces chromaticities
    // according to Rec. ITU-R BT.709-3
    //--------------------------------------------

    Chromaticities (const IMATH_NAMESPACE::V2f &red   = IMATH_NAMESPACE::V2f (0.6400f, 0.3300f),
		    const IMATH_NAMESPACE::V2f &green = IMATH_NAMESPACE::V2f (0.3000f, 0.6000f),
		    const IMATH_NAMESPACE::V2f &blue  = IMATH_NAMESPACE::V2f (0.1500f, 0.0600f),
		    const IMATH_NAMESPACE::V2f &white = IMATH_NAMESPACE::V2f (0.3127f, 0.3290f));
    
    
    //---------
    // Equality
    //---------
    
    bool		operator == (const Chromaticities &v) const;    
    bool		operator != (const Chromaticities &v) const;
};


//
// Conversions between RGB and CIE XYZ
//
// RGB to XYZ:
//
// 	Given a set of chromaticities, c, and the luminance, Y, of the RGB
// 	triple (1,1,1), or "white", RGBtoXYZ(c,Y) computes a matrix, M, so
// 	that multiplying an RGB value, v, with M produces an equivalent
// 	XYZ value, w.  (w == v * M)
// 
// 	If we define that
// 
// 	   (Xr, Yr, Zr) == (1, 0, 0) * M
// 	   (Xg, Yg, Zg) == (0, 1, 0) * M
// 	   (Xb, Yb, Zb) == (0, 0, 1) * M
// 	   (Xw, Yw, Zw) == (1, 1, 1) * M,
// 
// 	then the following statements are true:
// 
// 	   Xr / (Xr + Yr + Zr) == c.red.x
// 	   Yr / (Xr + Yr + Zr) == c.red.y
// 
// 	   Xg / (Xg + Yg + Zg) == c.red.x
// 	   Yg / (Xg + Yg + Zg) == c.red.y
// 
// 	   Xb / (Xb + Yb + Zb) == c.red.x
// 	   Yb / (Xb + Yb + Zb) == c.red.y
// 
// 	   Xw / (Xw + Yw + Zw) == c.red.x
// 	   Yw / (Xw + Yw + Zw) == c.red.y
// 
// 	   Yw == Y.
// 
// XYZ to RGB:
// 
// 	YYZtoRGB(c,Y) returns RGBtoXYZ(c,Y).inverse().
// 

IMF_EXPORT IMATH_NAMESPACE::M44f    RGBtoXYZ (const Chromaticities chroma, float Y);
IMF_EXPORT IMATH_NAMESPACE::M44f    XYZtoRGB (const Chromaticities chroma, float Y);


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT

#endif

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