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 : //proc/self/root/usr/include/OpenEXR/ImfRgba.h
///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2004, 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,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// 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_RGBA_H
#define INCLUDED_IMF_RGBA_H

//-----------------------------------------------------------------------------
//
//	class Rgba
//
//-----------------------------------------------------------------------------

#include "half.h"
#include "ImfNamespace.h"

OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_ENTER


//
// RGBA pixel
//

struct Rgba
{
    half	r;
    half	g;
    half	b;
    half	a;
    
    Rgba () {}
    Rgba (half r, half g, half b, half a = 1.f): r (r), g (g), b (b), a (a) {}

    Rgba & operator = (const Rgba &other)
    {
    	r = other.r;
    	g = other.g;
    	b = other.b;
    	a = other.a;

    	return *this;
    }
};


//
// Channels in an RGBA file
//

enum RgbaChannels
{
    WRITE_R	= 0x01,		// Red
    WRITE_G	= 0x02,		// Green
    WRITE_B	= 0x04,		// Blue
    WRITE_A	= 0x08,		// Alpha

    WRITE_Y	= 0x10,		// Luminance, for black-and-white images,
    				// or in combination with chroma

    WRITE_C	= 0x20,		// Chroma (two subsampled channels, RY and BY,
    				// supported only for scanline-based files)

    WRITE_RGB	= 0x07,		// Red, green, blue
    WRITE_RGBA	= 0x0f,		// Red, green, blue, alpha

    WRITE_YC	= 0x30,		// Luminance, chroma
    WRITE_YA	= 0x18,		// Luminance, alpha
    WRITE_YCA	= 0x38		// Luminance, chroma, alpha
};


OPENEXR_IMF_INTERNAL_NAMESPACE_HEADER_EXIT





#endif

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